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authorDavid S. Miller <davem@sunset.davemloft.net>2007-04-27 00:19:23 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-27 03:26:46 -0400
commitcd9ad58d4061494e7fdd70ded7bcf2418daf356a (patch)
tree2959058a6a463f4743219060b2116d17b3e6dcf7 /drivers
parent16ce82d846f2e6b652a064f91c5019cfe8682be4 (diff)
[SCSI] SUNESP: Complete driver rewrite to version 2.0
Major features: 1) Tagged queuing support. 2) Will properly negotiate for synchronous transfers even on devices that reject the wide negotiation message, such as CDROMs 3) Significantly lower kernel stack usage in interrupt handler path by elimination of function vector arrays, replaced by a top-level switch statement state machine. 4) Uses generic scsi infrastructure as much as possible to avoid code duplication. 5) Automatic request of sense data in response to CHECK_CONDITION 6) Portable to other platforms using ESP such as DEC and Sun3 systems. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/Kconfig6
-rw-r--r--drivers/scsi/Makefile3
-rw-r--r--drivers/scsi/esp.c4394
-rw-r--r--drivers/scsi/esp.h406
-rw-r--r--drivers/scsi/esp_scsi.c2710
-rw-r--r--drivers/scsi/esp_scsi.h560
-rw-r--r--drivers/scsi/sun_esp.c634
7 files changed, 3912 insertions, 4801 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 4cd280e8696..fcc4cb6c7f4 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1763,9 +1763,15 @@ config SUN3X_ESP
1763 The ESP was an on-board SCSI controller used on Sun 3/80 1763 The ESP was an on-board SCSI controller used on Sun 3/80
1764 machines. Say Y here to compile in support for it. 1764 machines. Say Y here to compile in support for it.
1765 1765
1766config SCSI_ESP_CORE
1767 tristate "ESP Scsi Driver Core"
1768 depends on SCSI
1769 select SCSI_SPI_ATTRS
1770
1766config SCSI_SUNESP 1771config SCSI_SUNESP
1767 tristate "Sparc ESP Scsi Driver" 1772 tristate "Sparc ESP Scsi Driver"
1768 depends on SBUS && SCSI 1773 depends on SBUS && SCSI
1774 select SCSI_ESP_CORE
1769 help 1775 help
1770 This is the driver for the Sun ESP SCSI host adapter. The ESP 1776 This is the driver for the Sun ESP SCSI host adapter. The ESP
1771 chipset is present in most SPARC SBUS-based computers. 1777 chipset is present in most SPARC SBUS-based computers.
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 79ecf4ebe6e..70cff4c599d 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -106,7 +106,8 @@ obj-$(CONFIG_MEGARAID_LEGACY) += megaraid.o
106obj-$(CONFIG_MEGARAID_NEWGEN) += megaraid/ 106obj-$(CONFIG_MEGARAID_NEWGEN) += megaraid/
107obj-$(CONFIG_MEGARAID_SAS) += megaraid/ 107obj-$(CONFIG_MEGARAID_SAS) += megaraid/
108obj-$(CONFIG_SCSI_ACARD) += atp870u.o 108obj-$(CONFIG_SCSI_ACARD) += atp870u.o
109obj-$(CONFIG_SCSI_SUNESP) += esp.o 109obj-$(CONFIG_SCSI_ESP_CORE) += esp_scsi.o
110obj-$(CONFIG_SCSI_SUNESP) += sun_esp.o
110obj-$(CONFIG_SCSI_GDTH) += gdth.o 111obj-$(CONFIG_SCSI_GDTH) += gdth.o
111obj-$(CONFIG_SCSI_INITIO) += initio.o 112obj-$(CONFIG_SCSI_INITIO) += initio.o
112obj-$(CONFIG_SCSI_INIA100) += a100u2w.o 113obj-$(CONFIG_SCSI_INIA100) += a100u2w.o
diff --git a/drivers/scsi/esp.c b/drivers/scsi/esp.c
deleted file mode 100644
index 2c2fe80bc42..00000000000
--- a/drivers/scsi/esp.c
+++ /dev/null
@@ -1,4394 +0,0 @@
1/* esp.c: ESP Sun SCSI driver.
2 *
3 * Copyright (C) 1995, 1998, 2006 David S. Miller (davem@davemloft.net)
4 */
5
6/* TODO:
7 *
8 * 1) Maybe disable parity checking in config register one for SCSI1
9 * targets. (Gilmore says parity error on the SBus can lock up
10 * old sun4c's)
11 * 2) Add support for DMA2 pipelining.
12 * 3) Add tagged queueing.
13 */
14
15#include <linux/kernel.h>
16#include <linux/delay.h>
17#include <linux/types.h>
18#include <linux/string.h>
19#include <linux/slab.h>
20#include <linux/blkdev.h>
21#include <linux/proc_fs.h>
22#include <linux/stat.h>
23#include <linux/init.h>
24#include <linux/spinlock.h>
25#include <linux/interrupt.h>
26#include <linux/module.h>
27
28#include "esp.h"
29
30#include <asm/sbus.h>
31#include <asm/dma.h>
32#include <asm/system.h>
33#include <asm/ptrace.h>
34#include <asm/pgtable.h>
35#include <asm/oplib.h>
36#include <asm/io.h>
37#include <asm/irq.h>
38#ifndef __sparc_v9__
39#include <asm/machines.h>
40#include <asm/idprom.h>
41#endif
42
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
45#include <scsi/scsi_device.h>
46#include <scsi/scsi_eh.h>
47#include <scsi/scsi_host.h>
48#include <scsi/scsi_tcq.h>
49
50#define DRV_VERSION "1.101"
51
52#define DEBUG_ESP
53/* #define DEBUG_ESP_HME */
54/* #define DEBUG_ESP_DATA */
55/* #define DEBUG_ESP_QUEUE */
56/* #define DEBUG_ESP_DISCONNECT */
57/* #define DEBUG_ESP_STATUS */
58/* #define DEBUG_ESP_PHASES */
59/* #define DEBUG_ESP_WORKBUS */
60/* #define DEBUG_STATE_MACHINE */
61/* #define DEBUG_ESP_CMDS */
62/* #define DEBUG_ESP_IRQS */
63/* #define DEBUG_SDTR */
64/* #define DEBUG_ESP_SG */
65
66/* Use the following to sprinkle debugging messages in a way which
67 * suits you if combinations of the above become too verbose when
68 * trying to track down a specific problem.
69 */
70/* #define DEBUG_ESP_MISC */
71
72#if defined(DEBUG_ESP)
73#define ESPLOG(foo) printk foo
74#else
75#define ESPLOG(foo)
76#endif /* (DEBUG_ESP) */
77
78#if defined(DEBUG_ESP_HME)
79#define ESPHME(foo) printk foo
80#else
81#define ESPHME(foo)
82#endif
83
84#if defined(DEBUG_ESP_DATA)
85#define ESPDATA(foo) printk foo
86#else
87#define ESPDATA(foo)
88#endif
89
90#if defined(DEBUG_ESP_QUEUE)
91#define ESPQUEUE(foo) printk foo
92#else
93#define ESPQUEUE(foo)
94#endif
95
96#if defined(DEBUG_ESP_DISCONNECT)
97#define ESPDISC(foo) printk foo
98#else
99#define ESPDISC(foo)
100#endif
101
102#if defined(DEBUG_ESP_STATUS)
103#define ESPSTAT(foo) printk foo
104#else
105#define ESPSTAT(foo)
106#endif
107
108#if defined(DEBUG_ESP_PHASES)
109#define ESPPHASE(foo) printk foo
110#else
111#define ESPPHASE(foo)
112#endif
113
114#if defined(DEBUG_ESP_WORKBUS)
115#define ESPBUS(foo) printk foo
116#else
117#define ESPBUS(foo)
118#endif
119
120#if defined(DEBUG_ESP_IRQS)
121#define ESPIRQ(foo) printk foo
122#else
123#define ESPIRQ(foo)
124#endif
125
126#if defined(DEBUG_SDTR)
127#define ESPSDTR(foo) printk foo
128#else
129#define ESPSDTR(foo)
130#endif
131
132#if defined(DEBUG_ESP_MISC)
133#define ESPMISC(foo) printk foo
134#else
135#define ESPMISC(foo)
136#endif
137
138/* Command phase enumeration. */
139enum {
140 not_issued = 0x00, /* Still in the issue_SC queue. */
141
142 /* Various forms of selecting a target. */
143#define in_slct_mask 0x10
144 in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */
145 in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */
146 in_slct_msg = 0x12, /* select, then send a message */
147 in_slct_tag = 0x13, /* select and send tagged queue msg */
148 in_slct_sneg = 0x14, /* select and acquire sync capabilities */
149
150 /* Any post selection activity. */
151#define in_phases_mask 0x20
152 in_datain = 0x20, /* Data is transferring from the bus */
153 in_dataout = 0x21, /* Data is transferring to the bus */
154 in_data_done = 0x22, /* Last DMA data operation done (maybe) */
155 in_msgin = 0x23, /* Eating message from target */
156 in_msgincont = 0x24, /* Eating more msg bytes from target */
157 in_msgindone = 0x25, /* Decide what to do with what we got */
158 in_msgout = 0x26, /* Sending message to target */
159 in_msgoutdone = 0x27, /* Done sending msg out */
160 in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */
161 in_cmdend = 0x29, /* Done sending slow cmd */
162 in_status = 0x2a, /* Was in status phase, finishing cmd */
163 in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */
164 in_the_dark = 0x2c, /* Don't know what bus phase we are in */
165
166 /* Special states, ie. not normal bus transitions... */
167#define in_spec_mask 0x80
168 in_abortone = 0x80, /* Aborting one command currently */
169 in_abortall = 0x81, /* Blowing away all commands we have */
170 in_resetdev = 0x82, /* SCSI target reset in progress */
171 in_resetbus = 0x83, /* SCSI bus reset in progress */
172 in_tgterror = 0x84, /* Target did something stupid */
173};
174
175enum {
176 /* Zero has special meaning, see skipahead[12]. */
177/*0*/ do_never,
178
179/*1*/ do_phase_determine,
180/*2*/ do_reset_bus,
181/*3*/ do_reset_complete,
182/*4*/ do_work_bus,
183/*5*/ do_intr_end
184};
185
186/* Forward declarations. */
187static irqreturn_t esp_intr(int irq, void *dev_id);
188
189/* Debugging routines */
190struct esp_cmdstrings {
191 u8 cmdchar;
192 char *text;
193} esp_cmd_strings[] = {
194 /* Miscellaneous */
195 { ESP_CMD_NULL, "ESP_NOP", },
196 { ESP_CMD_FLUSH, "FIFO_FLUSH", },
197 { ESP_CMD_RC, "RSTESP", },
198 { ESP_CMD_RS, "RSTSCSI", },
199 /* Disconnected State Group */
200 { ESP_CMD_RSEL, "RESLCTSEQ", },
201 { ESP_CMD_SEL, "SLCTNATN", },
202 { ESP_CMD_SELA, "SLCTATN", },
203 { ESP_CMD_SELAS, "SLCTATNSTOP", },
204 { ESP_CMD_ESEL, "ENSLCTRESEL", },
205 { ESP_CMD_DSEL, "DISSELRESEL", },
206 { ESP_CMD_SA3, "SLCTATN3", },
207 { ESP_CMD_RSEL3, "RESLCTSEQ", },
208 /* Target State Group */
209 { ESP_CMD_SMSG, "SNDMSG", },
210 { ESP_CMD_SSTAT, "SNDSTATUS", },
211 { ESP_CMD_SDATA, "SNDDATA", },
212 { ESP_CMD_DSEQ, "DISCSEQ", },
213 { ESP_CMD_TSEQ, "TERMSEQ", },
214 { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", },
215 { ESP_CMD_DCNCT, "DISC", },
216 { ESP_CMD_RMSG, "RCVMSG", },
217 { ESP_CMD_RCMD, "RCVCMD", },
218 { ESP_CMD_RDATA, "RCVDATA", },
219 { ESP_CMD_RCSEQ, "RCVCMDSEQ", },
220 /* Initiator State Group */
221 { ESP_CMD_TI, "TRANSINFO", },
222 { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", },
223 { ESP_CMD_MOK, "MSGACCEPTED", },
224 { ESP_CMD_TPAD, "TPAD", },
225 { ESP_CMD_SATN, "SATN", },
226 { ESP_CMD_RATN, "RATN", },
227};
228#define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
229
230/* Print textual representation of an ESP command */
231static inline void esp_print_cmd(u8 espcmd)
232{
233 u8 dma_bit = espcmd & ESP_CMD_DMA;
234 int i;
235
236 espcmd &= ~dma_bit;
237 for (i = 0; i < NUM_ESP_COMMANDS; i++)
238 if (esp_cmd_strings[i].cmdchar == espcmd)
239 break;
240 if (i == NUM_ESP_COMMANDS)
241 printk("ESP_Unknown");
242 else
243 printk("%s%s", esp_cmd_strings[i].text,
244 ((dma_bit) ? "+DMA" : ""));
245}
246
247/* Print the status register's value */
248static inline void esp_print_statreg(u8 statreg)
249{
250 u8 phase;
251
252 printk("STATUS<");
253 phase = statreg & ESP_STAT_PMASK;
254 printk("%s,", (phase == ESP_DOP ? "DATA-OUT" :
255 (phase == ESP_DIP ? "DATA-IN" :
256 (phase == ESP_CMDP ? "COMMAND" :
257 (phase == ESP_STATP ? "STATUS" :
258 (phase == ESP_MOP ? "MSG-OUT" :
259 (phase == ESP_MIP ? "MSG_IN" :
260 "unknown")))))));
261 if (statreg & ESP_STAT_TDONE)
262 printk("TRANS_DONE,");
263 if (statreg & ESP_STAT_TCNT)
264 printk("TCOUNT_ZERO,");
265 if (statreg & ESP_STAT_PERR)
266 printk("P_ERROR,");
267 if (statreg & ESP_STAT_SPAM)
268 printk("SPAM,");
269 if (statreg & ESP_STAT_INTR)
270 printk("IRQ,");
271 printk(">");
272}
273
274/* Print the interrupt register's value */
275static inline void esp_print_ireg(u8 intreg)
276{
277 printk("INTREG< ");
278 if (intreg & ESP_INTR_S)
279 printk("SLCT_NATN ");
280 if (intreg & ESP_INTR_SATN)
281 printk("SLCT_ATN ");
282 if (intreg & ESP_INTR_RSEL)
283 printk("RSLCT ");
284 if (intreg & ESP_INTR_FDONE)
285 printk("FDONE ");
286 if (intreg & ESP_INTR_BSERV)
287 printk("BSERV ");
288 if (intreg & ESP_INTR_DC)
289 printk("DISCNCT ");
290 if (intreg & ESP_INTR_IC)
291 printk("ILL_CMD ");
292 if (intreg & ESP_INTR_SR)
293 printk("SCSI_BUS_RESET ");
294 printk(">");
295}
296
297/* Print the sequence step registers contents */
298static inline void esp_print_seqreg(u8 stepreg)
299{
300 stepreg &= ESP_STEP_VBITS;
301 printk("STEP<%s>",
302 (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" :
303 (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" :
304 (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" :
305 (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" :
306 (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" :
307 "UNKNOWN"))))));
308}
309
310static char *phase_string(int phase)
311{
312 switch (phase) {
313 case not_issued:
314 return "UNISSUED";
315 case in_slct_norm:
316 return "SLCTNORM";
317 case in_slct_stop:
318 return "SLCTSTOP";
319 case in_slct_msg:
320 return "SLCTMSG";
321 case in_slct_tag:
322 return "SLCTTAG";
323 case in_slct_sneg:
324 return "SLCTSNEG";
325 case in_datain:
326 return "DATAIN";
327 case in_dataout:
328 return "DATAOUT";
329 case in_data_done:
330 return "DATADONE";
331 case in_msgin:
332 return "MSGIN";
333 case in_msgincont:
334 return "MSGINCONT";
335 case in_msgindone:
336 return "MSGINDONE";
337 case in_msgout:
338 return "MSGOUT";
339 case in_msgoutdone:
340 return "MSGOUTDONE";
341 case in_cmdbegin:
342 return "CMDBEGIN";
343 case in_cmdend:
344 return "CMDEND";
345 case in_status:
346 return "STATUS";
347 case in_freeing:
348 return "FREEING";
349 case in_the_dark:
350 return "CLUELESS";
351 case in_abortone:
352 return "ABORTONE";
353 case in_abortall:
354 return "ABORTALL";
355 case in_resetdev:
356 return "RESETDEV";
357 case in_resetbus:
358 return "RESETBUS";
359 case in_tgterror:
360 return "TGTERROR";
361 default:
362 return "UNKNOWN";
363 };
364}
365
366#ifdef DEBUG_STATE_MACHINE
367static inline void esp_advance_phase(struct scsi_cmnd *s, int newphase)
368{
369 ESPLOG(("<%s>", phase_string(newphase)));
370 s->SCp.sent_command = s->SCp.phase;
371 s->SCp.phase = newphase;
372}
373#else
374#define esp_advance_phase(__s, __newphase) \
375 (__s)->SCp.sent_command = (__s)->SCp.phase; \
376 (__s)->SCp.phase = (__newphase);
377#endif
378
379#ifdef DEBUG_ESP_CMDS
380static inline void esp_cmd(struct esp *esp, u8 cmd)
381{
382 esp->espcmdlog[esp->espcmdent] = cmd;
383 esp->espcmdent = (esp->espcmdent + 1) & 31;
384 sbus_writeb(cmd, esp->eregs + ESP_CMD);
385}
386#else
387#define esp_cmd(__esp, __cmd) \
388 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
389#endif
390
391#define ESP_INTSOFF(__dregs) \
392 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
393#define ESP_INTSON(__dregs) \
394 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
395#define ESP_IRQ_P(__dregs) \
396 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
397
398/* How we use the various Linux SCSI data structures for operation.
399 *
400 * struct scsi_cmnd:
401 *
402 * We keep track of the synchronous capabilities of a target
403 * in the device member, using sync_min_period and
404 * sync_max_offset. These are the values we directly write
405 * into the ESP registers while running a command. If offset
406 * is zero the ESP will use asynchronous transfers.
407 * If the borken flag is set we assume we shouldn't even bother
408 * trying to negotiate for synchronous transfer as this target
409 * is really stupid. If we notice the target is dropping the
410 * bus, and we have been allowing it to disconnect, we clear
411 * the disconnect flag.
412 */
413
414
415/* Manipulation of the ESP command queues. Thanks to the aha152x driver
416 * and its author, Juergen E. Fischer, for the methods used here.
417 * Note that these are per-ESP queues, not global queues like
418 * the aha152x driver uses.
419 */
420static inline void append_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC)
421{
422 struct scsi_cmnd *end;
423
424 new_SC->host_scribble = (unsigned char *) NULL;
425 if (!*SC)
426 *SC = new_SC;
427 else {
428 for (end=*SC;end->host_scribble;end=(struct scsi_cmnd *)end->host_scribble)
429 ;
430 end->host_scribble = (unsigned char *) new_SC;
431 }
432}
433
434static inline void prepend_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC)
435{
436 new_SC->host_scribble = (unsigned char *) *SC;
437 *SC = new_SC;
438}
439
440static inline struct scsi_cmnd *remove_first_SC(struct scsi_cmnd **SC)
441{
442 struct scsi_cmnd *ptr;
443 ptr = *SC;
444 if (ptr)
445 *SC = (struct scsi_cmnd *) (*SC)->host_scribble;
446 return ptr;
447}
448
449static inline struct scsi_cmnd *remove_SC(struct scsi_cmnd **SC, int target, int lun)
450{
451 struct scsi_cmnd *ptr, *prev;
452
453 for (ptr = *SC, prev = NULL;
454 ptr && ((ptr->device->id != target) || (ptr->device->lun != lun));
455 prev = ptr, ptr = (struct scsi_cmnd *) ptr->host_scribble)
456 ;
457 if (ptr) {
458 if (prev)
459 prev->host_scribble=ptr->host_scribble;
460 else
461 *SC=(struct scsi_cmnd *)ptr->host_scribble;
462 }
463 return ptr;
464}
465
466/* Resetting various pieces of the ESP scsi driver chipset/buses. */
467static void esp_reset_dma(struct esp *esp)
468{
469 int can_do_burst16, can_do_burst32, can_do_burst64;
470 int can_do_sbus64;
471 u32 tmp;
472
473 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
474 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
475 can_do_burst64 = 0;
476 can_do_sbus64 = 0;
477 if (sbus_can_dma_64bit(esp->sdev))
478 can_do_sbus64 = 1;
479 if (sbus_can_burst64(esp->sdev))
480 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
481
482 /* Punt the DVMA into a known state. */
483 if (esp->dma->revision != dvmahme) {
484 tmp = sbus_readl(esp->dregs + DMA_CSR);
485 sbus_writel(tmp | DMA_RST_SCSI, esp->dregs + DMA_CSR);
486 sbus_writel(tmp & ~DMA_RST_SCSI, esp->dregs + DMA_CSR);
487 }
488 switch (esp->dma->revision) {
489 case dvmahme:
490 /* This is the HME DVMA gate array. */
491
492 sbus_writel(DMA_RESET_FAS366, esp->dregs + DMA_CSR);
493 sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR);
494
495 esp->prev_hme_dmacsr = (DMA_PARITY_OFF|DMA_2CLKS|DMA_SCSI_DISAB|DMA_INT_ENAB);
496 esp->prev_hme_dmacsr &= ~(DMA_ENABLE|DMA_ST_WRITE|DMA_BRST_SZ);
497
498 if (can_do_burst64)
499 esp->prev_hme_dmacsr |= DMA_BRST64;
500 else if (can_do_burst32)
501 esp->prev_hme_dmacsr |= DMA_BRST32;
502
503 if (can_do_sbus64) {
504 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
505 sbus_set_sbus64(esp->sdev, esp->bursts);
506 }
507
508 /* This chip is horrible. */
509 while (sbus_readl(esp->dregs + DMA_CSR) & DMA_PEND_READ)
510 udelay(1);
511
512 sbus_writel(0, esp->dregs + DMA_CSR);
513 sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
514
515 /* This is necessary to avoid having the SCSI channel
516 * engine lock up on us.
517 */
518 sbus_writel(0, esp->dregs + DMA_ADDR);
519
520 break;
521 case dvmarev2:
522 /* This is the gate array found in the sun4m
523 * NCR SBUS I/O subsystem.
524 */
525 if (esp->erev != esp100) {
526 tmp = sbus_readl(esp->dregs + DMA_CSR);
527 sbus_writel(tmp | DMA_3CLKS, esp->dregs + DMA_CSR);
528 }
529 break;
530 case dvmarev3:
531 tmp = sbus_readl(esp->dregs + DMA_CSR);
532 tmp &= ~DMA_3CLKS;
533 tmp |= DMA_2CLKS;
534 if (can_do_burst32) {
535 tmp &= ~DMA_BRST_SZ;
536 tmp |= DMA_BRST32;
537 }
538 sbus_writel(tmp, esp->dregs + DMA_CSR);
539 break;
540 case dvmaesc1:
541 /* This is the DMA unit found on SCSI/Ether cards. */
542 tmp = sbus_readl(esp->dregs + DMA_CSR);
543 tmp |= DMA_ADD_ENABLE;
544 tmp &= ~DMA_BCNT_ENAB;
545 if (!can_do_burst32 && can_do_burst16) {
546 tmp |= DMA_ESC_BURST;
547 } else {
548 tmp &= ~(DMA_ESC_BURST);
549 }
550 sbus_writel(tmp, esp->dregs + DMA_CSR);
551 break;
552 default:
553 break;
554 };
555 ESP_INTSON(esp->dregs);
556}
557
558/* Reset the ESP chip, _not_ the SCSI bus. */
559static void __init esp_reset_esp(struct esp *esp)
560{
561 u8 family_code, version;
562 int i;
563
564 /* Now reset the ESP chip */
565 esp_cmd(esp, ESP_CMD_RC);
566 esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
567 esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
568
569 /* Reload the configuration registers */
570 sbus_writeb(esp->cfact, esp->eregs + ESP_CFACT);
571 esp->prev_stp = 0;
572 sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
573 esp->prev_soff = 0;
574 sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
575 sbus_writeb(esp->neg_defp, esp->eregs + ESP_TIMEO);
576
577 /* This is the only point at which it is reliable to read
578 * the ID-code for a fast ESP chip variants.
579 */
580 esp->max_period = ((35 * esp->ccycle) / 1000);
581 if (esp->erev == fast) {
582 version = sbus_readb(esp->eregs + ESP_UID);
583 family_code = (version & 0xf8) >> 3;
584 if (family_code == 0x02)
585 esp->erev = fas236;
586 else if (family_code == 0x0a)
587 esp->erev = fashme; /* Version is usually '5'. */
588 else
589 esp->erev = fas100a;
590 ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
591 esp->esp_id,
592 (esp->erev == fas236) ? "fas236" :
593 ((esp->erev == fas100a) ? "fas100a" :
594 "fasHME"), family_code, (version & 7)));
595
596 esp->min_period = ((4 * esp->ccycle) / 1000);
597 } else {
598 esp->min_period = ((5 * esp->ccycle) / 1000);
599 }
600 esp->max_period = (esp->max_period + 3)>>2;
601 esp->min_period = (esp->min_period + 3)>>2;
602
603 sbus_writeb(esp->config1, esp->eregs + ESP_CFG1);
604 switch (esp->erev) {
605 case esp100:
606 /* nothing to do */
607 break;
608 case esp100a:
609 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
610 break;
611 case esp236:
612 /* Slow 236 */
613 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
614 esp->prev_cfg3 = esp->config3[0];
615 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
616 break;
617 case fashme:
618 esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
619 /* fallthrough... */
620 case fas236:
621 /* Fast 236 or HME */
622 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
623 for (i = 0; i < 16; i++) {
624 if (esp->erev == fashme) {
625 u8 cfg3;
626
627 cfg3 = ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH;
628 if (esp->scsi_id >= 8)
629 cfg3 |= ESP_CONFIG3_IDBIT3;
630 esp->config3[i] |= cfg3;
631 } else {
632 esp->config3[i] |= ESP_CONFIG3_FCLK;
633 }
634 }
635 esp->prev_cfg3 = esp->config3[0];
636 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
637 if (esp->erev == fashme) {
638 esp->radelay = 80;
639 } else {
640 if (esp->diff)
641 esp->radelay = 0;
642 else
643 esp->radelay = 96;
644 }
645 break;
646 case fas100a:
647 /* Fast 100a */
648 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
649 for (i = 0; i < 16; i++)
650 esp->config3[i] |= ESP_CONFIG3_FCLOCK;
651 esp->prev_cfg3 = esp->config3[0];
652 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
653 esp->radelay = 32;
654 break;
655 default:
656 panic("esp: what could it be... I wonder...");
657 break;
658 };
659
660 /* Eat any bitrot in the chip */
661 sbus_readb(esp->eregs + ESP_INTRPT);
662 udelay(100);
663}
664
665/* This places the ESP into a known state at boot time. */
666static void __init esp_bootup_reset(struct esp *esp)
667{
668 u8 tmp;
669
670 /* Reset the DMA */
671 esp_reset_dma(esp);
672
673 /* Reset the ESP */
674 esp_reset_esp(esp);
675
676 /* Reset the SCSI bus, but tell ESP not to generate an irq */
677 tmp = sbus_readb(esp->eregs + ESP_CFG1);
678 tmp |= ESP_CONFIG1_SRRDISAB;
679 sbus_writeb(tmp, esp->eregs + ESP_CFG1);
680
681 esp_cmd(esp, ESP_CMD_RS);
682 udelay(400);
683
684 sbus_writeb(esp->config1, esp->eregs + ESP_CFG1);
685
686 /* Eat any bitrot in the chip and we are done... */
687 sbus_readb(esp->eregs + ESP_INTRPT);
688}
689
690static int __init esp_find_dvma(struct esp *esp, struct sbus_dev *dma_sdev)
691{
692 struct sbus_dev *sdev = esp->sdev;
693 struct sbus_dma *dma;
694
695 if (dma_sdev != NULL) {
696 for_each_dvma(dma) {
697 if (dma->sdev == dma_sdev)
698 break;
699 }
700 } else {
701 for_each_dvma(dma) {
702 /* If allocated already, can't use it. */
703 if (dma->allocated)
704 continue;
705
706 if (dma->sdev == NULL)
707 break;
708
709 /* If bus + slot are the same and it has the
710 * correct OBP name, it's ours.
711 */
712 if (sdev->bus == dma->sdev->bus &&
713 sdev->slot == dma->sdev->slot &&
714 (!strcmp(dma->sdev->prom_name, "dma") ||
715 !strcmp(dma->sdev->prom_name, "espdma")))
716 break;
717 }
718 }
719
720 /* If we don't know how to handle the dvma,
721 * do not use this device.
722 */
723 if (dma == NULL) {
724 printk("Cannot find dvma for ESP%d's SCSI\n", esp->esp_id);
725 return -1;
726 }
727 if (dma->allocated) {
728 printk("esp%d: can't use my espdma\n", esp->esp_id);
729 return -1;
730 }
731 dma->allocated = 1;
732 esp->dma = dma;
733 esp->dregs = dma->regs;
734
735 return 0;
736}
737
738static int __init esp_map_regs(struct esp *esp, int hme)
739{
740 struct sbus_dev *sdev = esp->sdev;
741 struct resource *res;
742
743 /* On HME, two reg sets exist, first is DVMA,
744 * second is ESP registers.
745 */
746 if (hme)
747 res = &sdev->resource[1];
748 else
749 res = &sdev->resource[0];
750
751 esp->eregs = sbus_ioremap(res, 0, ESP_REG_SIZE, "ESP Registers");
752
753 if (esp->eregs == 0)
754 return -1;
755 return 0;
756}
757
758static int __init esp_map_cmdarea(struct esp *esp)
759{
760 struct sbus_dev *sdev = esp->sdev;
761
762 esp->esp_command = sbus_alloc_consistent(sdev, 16,
763 &esp->esp_command_dvma);
764 if (esp->esp_command == NULL ||
765 esp->esp_command_dvma == 0)
766 return -1;
767 return 0;
768}
769
770static int __init esp_register_irq(struct esp *esp)
771{
772 esp->ehost->irq = esp->irq = esp->sdev->irqs[0];
773
774 /* We used to try various overly-clever things to
775 * reduce the interrupt processing overhead on
776 * sun4c/sun4m when multiple ESP's shared the
777 * same IRQ. It was too complex and messy to
778 * sanely maintain.
779 */
780 if (request_irq(esp->ehost->irq, esp_intr,
781 IRQF_SHARED, "ESP SCSI", esp)) {
782 printk("esp%d: Cannot acquire irq line\n",
783 esp->esp_id);
784 return -1;
785 }
786
787 printk("esp%d: IRQ %d ", esp->esp_id,
788 esp->ehost->irq);
789
790 return 0;
791}
792
793static void __init esp_get_scsi_id(struct esp *esp)
794{
795 struct sbus_dev *sdev = esp->sdev;
796 struct device_node *dp = sdev->ofdev.node;
797
798 esp->scsi_id = of_getintprop_default(dp,
799 "initiator-id",
800 -1);
801 if (esp->scsi_id == -1)
802 esp->scsi_id = of_getintprop_default(dp,
803 "scsi-initiator-id",
804 -1);
805 if (esp->scsi_id == -1)
806 esp->scsi_id = (sdev->bus == NULL) ? 7 :
807 of_getintprop_default(sdev->bus->ofdev.node,
808 "scsi-initiator-id",
809 7);
810 esp->ehost->this_id = esp->scsi_id;
811 esp->scsi_id_mask = (1 << esp->scsi_id);
812
813}
814
815static void __init esp_get_clock_params(struct esp *esp)
816{
817 struct sbus_dev *sdev = esp->sdev;
818 int prom_node = esp->prom_node;
819 int sbus_prom_node;
820 unsigned int fmhz;
821 u8 ccf;
822
823 if (sdev != NULL && sdev->bus != NULL)
824 sbus_prom_node = sdev->bus->prom_node;
825 else
826 sbus_prom_node = 0;
827
828 /* This is getting messy but it has to be done
829 * correctly or else you get weird behavior all
830 * over the place. We are trying to basically
831 * figure out three pieces of information.
832 *
833 * a) Clock Conversion Factor
834 *
835 * This is a representation of the input
836 * crystal clock frequency going into the
837 * ESP on this machine. Any operation whose
838 * timing is longer than 400ns depends on this
839 * value being correct. For example, you'll
840 * get blips for arbitration/selection during
841 * high load or with multiple targets if this
842 * is not set correctly.
843 *
844 * b) Selection Time-Out
845 *
846 * The ESP isn't very bright and will arbitrate
847 * for the bus and try to select a target
848 * forever if you let it. This value tells
849 * the ESP when it has taken too long to
850 * negotiate and that it should interrupt
851 * the CPU so we can see what happened.
852 * The value is computed as follows (from
853 * NCR/Symbios chip docs).
854 *
855 * (Time Out Period) * (Input Clock)
856 * STO = ----------------------------------
857 * (8192) * (Clock Conversion Factor)
858 *
859 * You usually want the time out period to be
860 * around 250ms, I think we'll set it a little
861 * bit higher to account for fully loaded SCSI
862 * bus's and slow devices that don't respond so
863 * quickly to selection attempts. (yeah, I know
864 * this is out of spec. but there is a lot of
865 * buggy pieces of firmware out there so bite me)
866 *
867 * c) Imperical constants for synchronous offset
868 * and transfer period register values
869 *
870 * This entails the smallest and largest sync
871 * period we could ever handle on this ESP.
872 */
873
874 fmhz = prom_getintdefault(prom_node, "clock-frequency", -1);
875 if (fmhz == -1)
876 fmhz = (!sbus_prom_node) ? 0 :
877 prom_getintdefault(sbus_prom_node, "clock-frequency", -1);
878
879 if (fmhz <= (5000000))
880 ccf = 0;
881 else
882 ccf = (((5000000 - 1) + (fmhz))/(5000000));
883
884 if (!ccf || ccf > 8) {
885 /* If we can't find anything reasonable,
886 * just assume 20MHZ. This is the clock
887 * frequency of the older sun4c's where I've
888 * been unable to find the clock-frequency
889 * PROM property. All other machines provide
890 * useful values it seems.
891 */
892 ccf = ESP_CCF_F4;
893 fmhz = (20000000);
894 }
895
896 if (ccf == (ESP_CCF_F7 + 1))
897 esp->cfact = ESP_CCF_F0;
898 else if (ccf == ESP_CCF_NEVER)
899 esp->cfact = ESP_CCF_F2;
900 else
901 esp->cfact = ccf;
902 esp->raw_cfact = ccf;
903
904 esp->cfreq = fmhz;
905 esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
906 esp->ctick = ESP_TICK(ccf, esp->ccycle);
907 esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
908 esp->sync_defp = SYNC_DEFP_SLOW;
909
910 printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
911 esp->scsi_id, (fmhz / 1000000),
912 (int)esp->ccycle, (int)ccf, (int) esp->neg_defp);
913}
914
915static void __init esp_get_bursts(struct esp *esp, struct sbus_dev *dma)
916{
917 struct sbus_dev *sdev = esp->sdev;
918 u8 bursts;
919
920 bursts = prom_getintdefault(esp->prom_node, "burst-sizes", 0xff);
921
922 if (dma) {
923 u8 tmp = prom_getintdefault(dma->prom_node,
924 "burst-sizes", 0xff);
925 if (tmp != 0xff)
926 bursts &= tmp;
927 }
928
929 if (sdev->bus) {
930 u8 tmp = prom_getintdefault(sdev->bus->prom_node,
931 "burst-sizes", 0xff);
932 if (tmp != 0xff)
933 bursts &= tmp;
934 }
935
936 if (bursts == 0xff ||
937 (bursts & DMA_BURST16) == 0 ||
938 (bursts & DMA_BURST32) == 0)
939 bursts = (DMA_BURST32 - 1);
940
941 esp->bursts = bursts;
942}
943
944static void __init esp_get_revision(struct esp *esp)
945{
946 u8 tmp;
947
948 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
949 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
950 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
951
952 tmp = sbus_readb(esp->eregs + ESP_CFG2);
953 tmp &= ~ESP_CONFIG2_MAGIC;
954 if (tmp != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
955 /* If what we write to cfg2 does not come back, cfg2
956 * is not implemented, therefore this must be a plain
957 * esp100.
958 */
959 esp->erev = esp100;
960 printk("NCR53C90(esp100)\n");
961 } else {
962 esp->config2 = 0;
963 esp->prev_cfg3 = esp->config3[0] = 5;
964 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
965 sbus_writeb(0, esp->eregs + ESP_CFG3);
966 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
967
968 tmp = sbus_readb(esp->eregs + ESP_CFG3);
969 if (tmp != 5) {
970 /* The cfg2 register is implemented, however
971 * cfg3 is not, must be esp100a.
972 */
973 esp->erev = esp100a;
974 printk("NCR53C90A(esp100a)\n");
975 } else {
976 int target;
977
978 for (target = 0; target < 16; target++)
979 esp->config3[target] = 0;
980 esp->prev_cfg3 = 0;
981 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
982
983 /* All of cfg{1,2,3} implemented, must be one of
984 * the fas variants, figure out which one.
985 */
986 if (esp->raw_cfact > ESP_CCF_F5) {
987 esp->erev = fast;
988 esp->sync_defp = SYNC_DEFP_FAST;
989 printk("NCR53C9XF(espfast)\n");
990 } else {
991 esp->erev = esp236;
992 printk("NCR53C9x(esp236)\n");
993 }
994 esp->config2 = 0;
995 sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
996 }
997 }
998}
999
1000static void __init esp_init_swstate(struct esp *esp)
1001{
1002 int i;
1003
1004 /* Command queues... */
1005 esp->current_SC = NULL;
1006 esp->disconnected_SC = NULL;
1007 esp->issue_SC = NULL;
1008
1009 /* Target and current command state... */
1010 esp->targets_present = 0;
1011 esp->resetting_bus = 0;
1012 esp->snip = 0;
1013
1014 init_waitqueue_head(&esp->reset_queue);
1015
1016 /* Debugging... */
1017 for(i = 0; i < 32; i++)
1018 esp->espcmdlog[i] = 0;
1019 esp->espcmdent = 0;
1020
1021 /* MSG phase state... */
1022 for(i = 0; i < 16; i++) {
1023 esp->cur_msgout[i] = 0;
1024 esp->cur_msgin[i] = 0;
1025 }
1026 esp->prevmsgout = esp->prevmsgin = 0;
1027 esp->msgout_len = esp->msgin_len = 0;
1028
1029 /* Clear the one behind caches to hold unmatchable values. */
1030 esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff;
1031 esp->prev_hme_dmacsr = 0xffffffff;
1032}
1033
1034static int __init detect_one_esp(struct scsi_host_template *tpnt,
1035 struct device *dev,
1036 struct sbus_dev *esp_dev,
1037 struct sbus_dev *espdma,
1038 struct sbus_bus *sbus,
1039 int hme)
1040{
1041 static int instance;
1042 struct Scsi_Host *esp_host = scsi_host_alloc(tpnt, sizeof(struct esp));
1043 struct esp *esp;
1044
1045 if (!esp_host)
1046 return -ENOMEM;
1047
1048 if (hme)
1049 esp_host->max_id = 16;
1050 esp = (struct esp *) esp_host->hostdata;
1051 esp->ehost = esp_host;
1052 esp->sdev = esp_dev;
1053 esp->esp_id = instance;
1054 esp->prom_node = esp_dev->prom_node;
1055 prom_getstring(esp->prom_node, "name", esp->prom_name,
1056 sizeof(esp->prom_name));
1057
1058 if (esp_find_dvma(esp, espdma) < 0)
1059 goto fail_unlink;
1060 if (esp_map_regs(esp, hme) < 0) {
1061 printk("ESP registers unmappable");
1062 goto fail_dvma_release;
1063 }
1064 if (esp_map_cmdarea(esp) < 0) {
1065 printk("ESP DVMA transport area unmappable");
1066 goto fail_unmap_regs;
1067 }
1068 if (esp_register_irq(esp) < 0)
1069 goto fail_unmap_cmdarea;
1070
1071 esp_get_scsi_id(esp);
1072
1073 esp->diff = prom_getbool(esp->prom_node, "differential");
1074 if (esp->diff)
1075 printk("Differential ");
1076
1077 esp_get_clock_params(esp);
1078 esp_get_bursts(esp, espdma);
1079 esp_get_revision(esp);
1080 esp_init_swstate(esp);
1081
1082 esp_bootup_reset(esp);
1083
1084 if (scsi_add_host(esp_host, dev))
1085 goto fail_free_irq;
1086
1087 dev_set_drvdata(&esp_dev->ofdev.dev, esp);
1088
1089 scsi_scan_host(esp_host);
1090 instance++;
1091
1092 return 0;
1093
1094fail_free_irq:
1095 free_irq(esp->ehost->irq, esp);
1096
1097fail_unmap_cmdarea:
1098 sbus_free_consistent(esp->sdev, 16,
1099 (void *) esp->esp_command,
1100 esp->esp_command_dvma);
1101
1102fail_unmap_regs:
1103 sbus_iounmap(esp->eregs, ESP_REG_SIZE);
1104
1105fail_dvma_release:
1106 esp->dma->allocated = 0;
1107
1108fail_unlink:
1109 scsi_host_put(esp_host);
1110 return -1;
1111}
1112
1113/* Detecting ESP chips on the machine. This is the simple and easy
1114 * version.
1115 */
1116static int __devexit esp_remove_common(struct esp *esp)
1117{
1118 unsigned int irq = esp->ehost->irq;
1119
1120 scsi_remove_host(esp->ehost);
1121
1122 ESP_INTSOFF(esp->dregs);
1123#if 0
1124 esp_reset_dma(esp);
1125 esp_reset_esp(esp);
1126#endif
1127
1128 free_irq(irq, esp);
1129 sbus_free_consistent(esp->sdev, 16,
1130 (void *) esp->esp_command, esp->esp_command_dvma);
1131 sbus_iounmap(esp->eregs, ESP_REG_SIZE);
1132 esp->dma->allocated = 0;
1133
1134 scsi_host_put(esp->ehost);
1135
1136 return 0;
1137}
1138
1139
1140#ifdef CONFIG_SUN4
1141
1142#include <asm/sun4paddr.h>
1143
1144static struct sbus_dev sun4_esp_dev;
1145
1146static int __init esp_sun4_probe(struct scsi_host_template *tpnt)
1147{
1148 if (sun4_esp_physaddr) {
1149 memset(&sun4_esp_dev, 0, sizeof(sun4_esp_dev));
1150 sun4_esp_dev.reg_addrs[0].phys_addr = sun4_esp_physaddr;
1151 sun4_esp_dev.irqs[0] = 4;
1152 sun4_esp_dev.resource[0].start = sun4_esp_physaddr;
1153 sun4_esp_dev.resource[0].end =
1154 sun4_esp_physaddr + ESP_REG_SIZE - 1;
1155 sun4_esp_dev.resource[0].flags = IORESOURCE_IO;
1156
1157 return detect_one_esp(tpnt, NULL,
1158 &sun4_esp_dev, NULL, NULL, 0);
1159 }
1160 return 0;
1161}
1162
1163static int __devexit esp_sun4_remove(void)
1164{
1165 struct of_device *dev = &sun4_esp_dev.ofdev;
1166 struct esp *esp = dev_get_drvdata(&dev->dev);
1167
1168 return esp_remove_common(esp);
1169}
1170
1171#else /* !CONFIG_SUN4 */
1172
1173static int __devinit esp_sbus_probe(struct of_device *dev, const struct of_device_id *match)
1174{
1175 struct sbus_dev *sdev = to_sbus_device(&dev->dev);
1176 struct device_node *dp = dev->node;
1177 struct sbus_dev *dma_sdev = NULL;
1178 int hme = 0;
1179
1180 if (dp->parent &&
1181 (!strcmp(dp->parent->name, "espdma") ||
1182 !strcmp(dp->parent->name, "dma")))
1183 dma_sdev = sdev->parent;
1184 else if (!strcmp(dp->name, "SUNW,fas")) {
1185 dma_sdev = sdev;
1186 hme = 1;
1187 }
1188
1189 return detect_one_esp(match->data, &dev->dev,
1190 sdev, dma_sdev, sdev->bus, hme);
1191}
1192
1193static int __devexit esp_sbus_remove(struct of_device *dev)
1194{
1195 struct esp *esp = dev_get_drvdata(&dev->dev);
1196
1197 return esp_remove_common(esp);
1198}
1199
1200#endif /* !CONFIG_SUN4 */
1201
1202/* The info function will return whatever useful
1203 * information the developer sees fit. If not provided, then
1204 * the name field will be used instead.
1205 */
1206static const char *esp_info(struct Scsi_Host *host)
1207{
1208 struct esp *esp;
1209
1210 esp = (struct esp *) host->hostdata;
1211 switch (esp->erev) {
1212 case esp100:
1213 return "Sparc ESP100 (NCR53C90)";
1214 case esp100a:
1215 return "Sparc ESP100A (NCR53C90A)";
1216 case esp236:
1217 return "Sparc ESP236";
1218 case fas236:
1219 return "Sparc ESP236-FAST";
1220 case fashme:
1221 return "Sparc ESP366-HME";
1222 case fas100a:
1223 return "Sparc ESP100A-FAST";
1224 default:
1225 return "Bogon ESP revision";
1226 };
1227}
1228
1229/* From Wolfgang Stanglmeier's NCR scsi driver. */
1230struct info_str
1231{
1232 char *buffer;
1233 int length;
1234 int offset;
1235 int pos;
1236};
1237
1238static void copy_mem_info(struct info_str *info, char *data, int len)
1239{
1240 if (info->pos + len > info->length)
1241 len = info->length - info->pos;
1242
1243 if (info->pos + len < info->offset) {
1244 info->pos += len;
1245 return;
1246 }
1247 if (info->pos < info->offset) {
1248 data += (info->offset - info->pos);
1249 len -= (info->offset - info->pos);
1250 }
1251
1252 if (len > 0) {
1253 memcpy(info->buffer + info->pos, data, len);
1254 info->pos += len;
1255 }
1256}
1257
1258static int copy_info(struct info_str *info, char *fmt, ...)
1259{
1260 va_list args;
1261 char buf[81];
1262 int len;
1263
1264 va_start(args, fmt);
1265 len = vsprintf(buf, fmt, args);
1266 va_end(args);
1267
1268 copy_mem_info(info, buf, len);
1269 return len;
1270}
1271
1272static int esp_host_info(struct esp *esp, char *ptr, off_t offset, int len)
1273{
1274 struct scsi_device *sdev;
1275 struct info_str info;
1276 int i;
1277
1278 info.buffer = ptr;
1279 info.length = len;
1280 info.offset = offset;
1281 info.pos = 0;
1282
1283 copy_info(&info, "Sparc ESP Host Adapter:\n");
1284 copy_info(&info, "\tPROM node\t\t%08x\n", (unsigned int) esp->prom_node);
1285 copy_info(&info, "\tPROM name\t\t%s\n", esp->prom_name);
1286 copy_info(&info, "\tESP Model\t\t");
1287 switch (esp->erev) {
1288 case esp100:
1289 copy_info(&info, "ESP100\n");
1290 break;
1291 case esp100a:
1292 copy_info(&info, "ESP100A\n");
1293 break;
1294 case esp236:
1295 copy_info(&info, "ESP236\n");
1296 break;
1297 case fas236:
1298 copy_info(&info, "FAS236\n");
1299 break;
1300 case fas100a:
1301 copy_info(&info, "FAS100A\n");
1302 break;
1303 case fast:
1304 copy_info(&info, "FAST\n");
1305 break;
1306 case fashme:
1307 copy_info(&info, "Happy Meal FAS\n");
1308 break;
1309 case espunknown:
1310 default:
1311 copy_info(&info, "Unknown!\n");
1312 break;
1313 };
1314 copy_info(&info, "\tDMA Revision\t\t");
1315 switch (esp->dma->revision) {
1316 case dvmarev0:
1317 copy_info(&info, "Rev 0\n");
1318 break;
1319 case dvmaesc1:
1320 copy_info(&info, "ESC Rev 1\n");
1321 break;
1322 case dvmarev1:
1323 copy_info(&info, "Rev 1\n");
1324 break;
1325 case dvmarev2:
1326 copy_info(&info, "Rev 2\n");
1327 break;
1328 case dvmarev3:
1329 copy_info(&info, "Rev 3\n");
1330 break;
1331 case dvmarevplus:
1332 copy_info(&info, "Rev 1+\n");
1333 break;
1334 case dvmahme:
1335 copy_info(&info, "Rev HME/FAS\n");
1336 break;
1337 default:
1338 copy_info(&info, "Unknown!\n");
1339 break;
1340 };
1341 copy_info(&info, "\tLive Targets\t\t[ ");
1342 for (i = 0; i < 15; i++) {
1343 if (esp->targets_present & (1 << i))
1344 copy_info(&info, "%d ", i);
1345 }
1346 copy_info(&info, "]\n\n");
1347
1348 /* Now describe the state of each existing target. */
1349 copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1350
1351 shost_for_each_device(sdev, esp->ehost) {
1352 struct esp_device *esp_dev = sdev->hostdata;
1353 uint id = sdev->id;
1354
1355 if (!(esp->targets_present & (1 << id)))
1356 continue;
1357
1358 copy_info(&info, "%d\t\t", id);
1359 copy_info(&info, "%08lx\t", esp->config3[id]);
1360 copy_info(&info, "[%02lx,%02lx]\t\t\t",
1361 esp_dev->sync_max_offset,
1362 esp_dev->sync_min_period);
1363 copy_info(&info, "%s\t\t",
1364 esp_dev->disconnect ? "yes" : "no");
1365 copy_info(&info, "%s\n",
1366 (esp->config3[id] & ESP_CONFIG3_EWIDE) ? "yes" : "no");
1367 }
1368 return info.pos > info.offset? info.pos - info.offset : 0;
1369}
1370
1371/* ESP proc filesystem code. */
1372static int esp_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
1373 int length, int inout)
1374{
1375 struct esp *esp = (struct esp *) host->hostdata;
1376
1377 if (inout)
1378 return -EINVAL; /* not yet */
1379
1380 if (start)
1381 *start = buffer;
1382
1383 return esp_host_info(esp, buffer, offset, length);
1384}
1385
1386static void esp_get_dmabufs(struct esp *esp, struct scsi_cmnd *sp)
1387{
1388 if (sp->use_sg == 0) {
1389 sp->SCp.this_residual = sp->request_bufflen;
1390 sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
1391 sp->SCp.buffers_residual = 0;
1392 if (sp->request_bufflen) {
1393 sp->SCp.have_data_in = sbus_map_single(esp->sdev, sp->SCp.buffer,
1394 sp->SCp.this_residual,
1395 sp->sc_data_direction);
1396 sp->SCp.ptr = (char *) ((unsigned long)sp->SCp.have_data_in);
1397 } else {
1398 sp->SCp.ptr = NULL;
1399 }
1400 } else {
1401 sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
1402 sp->SCp.buffers_residual = sbus_map_sg(esp->sdev,
1403 sp->SCp.buffer,
1404 sp->use_sg,
1405 sp->sc_data_direction);
1406 sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer);
1407 sp->SCp.ptr = (char *) ((unsigned long)sg_dma_address(sp->SCp.buffer));
1408 }
1409}
1410
1411static void esp_release_dmabufs(struct esp *esp, struct scsi_cmnd *sp)
1412{
1413 if (sp->use_sg) {
1414 sbus_unmap_sg(esp->sdev, sp->request_buffer, sp->use_sg,
1415 sp->sc_data_direction);
1416 } else if (sp->request_bufflen) {
1417 sbus_unmap_single(esp->sdev,
1418 sp->SCp.have_data_in,
1419 sp->request_bufflen,
1420 sp->sc_data_direction);
1421 }
1422}
1423
1424static void esp_restore_pointers(struct esp *esp, struct scsi_cmnd *sp)
1425{
1426 struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
1427
1428 sp->SCp.ptr = ep->saved_ptr;
1429 sp->SCp.buffer = ep->saved_buffer;
1430 sp->SCp.this_residual = ep->saved_this_residual;
1431 sp->SCp.buffers_residual = ep->saved_buffers_residual;
1432}
1433
1434static void esp_save_pointers(struct esp *esp, struct scsi_cmnd *sp)
1435{
1436 struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
1437
1438 ep->saved_ptr = sp->SCp.ptr;
1439 ep->saved_buffer = sp->SCp.buffer;
1440 ep->saved_this_residual = sp->SCp.this_residual;
1441 ep->saved_buffers_residual = sp->SCp.buffers_residual;
1442}
1443
1444/* Some rules:
1445 *
1446 * 1) Never ever panic while something is live on the bus.
1447 * If there is to be any chance of syncing the disks this
1448 * rule is to be obeyed.
1449 *
1450 * 2) Any target that causes a foul condition will no longer
1451 * have synchronous transfers done to it, no questions
1452 * asked.
1453 *
1454 * 3) Keep register accesses to a minimum. Think about some
1455 * day when we have Xbus machines this is running on and
1456 * the ESP chip is on the other end of the machine on a
1457 * different board from the cpu where this is running.
1458 */
1459
1460/* Fire off a command. We assume the bus is free and that the only
1461 * case where we could see an interrupt is where we have disconnected
1462 * commands active and they are trying to reselect us.
1463 */
1464static inline void esp_check_cmd(struct esp *esp, struct scsi_cmnd *sp)
1465{
1466 switch (sp->cmd_len) {
1467 case 6:
1468 case 10:
1469 case 12:
1470 esp->esp_slowcmd = 0;
1471 break;
1472
1473 default:
1474 esp->esp_slowcmd = 1;
1475 esp->esp_scmdleft = sp->cmd_len;
1476 esp->esp_scmdp = &sp->cmnd[0];
1477 break;
1478 };
1479}
1480
1481static inline void build_sync_nego_msg(struct esp *esp, int period, int offset)
1482{
1483 esp->cur_msgout[0] = EXTENDED_MESSAGE;
1484 esp->cur_msgout[1] = 3;
1485 esp->cur_msgout[2] = EXTENDED_SDTR;
1486 esp->cur_msgout[3] = period;
1487 esp->cur_msgout[4] = offset;
1488 esp->msgout_len = 5;
1489}
1490
1491/* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1492static inline void build_wide_nego_msg(struct esp *esp, int size)
1493{
1494 esp->cur_msgout[0] = EXTENDED_MESSAGE;
1495 esp->cur_msgout[1] = 2;
1496 esp->cur_msgout[2] = EXTENDED_WDTR;
1497 switch (size) {
1498 case 32:
1499 esp->cur_msgout[3] = 2;
1500 break;
1501 case 16:
1502 esp->cur_msgout[3] = 1;
1503 break;
1504 case 8:
1505 default:
1506 esp->cur_msgout[3] = 0;
1507 break;
1508 };
1509
1510 esp->msgout_len = 4;
1511}
1512
1513static void esp_exec_cmd(struct esp *esp)
1514{
1515 struct scsi_cmnd *SCptr;
1516 struct scsi_device *SDptr;
1517 struct esp_device *esp_dev;
1518 volatile u8 *cmdp = esp->esp_command;
1519 u8 the_esp_command;
1520 int lun, target;
1521 int i;
1522
1523 /* Hold off if we have disconnected commands and
1524 * an IRQ is showing...
1525 */
1526 if (esp->disconnected_SC && ESP_IRQ_P(esp->dregs))
1527 return;
1528
1529 /* Grab first member of the issue queue. */
1530 SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
1531
1532 /* Safe to panic here because current_SC is null. */
1533 if (!SCptr)
1534 panic("esp: esp_exec_cmd and issue queue is NULL");
1535
1536 SDptr = SCptr->device;
1537 esp_dev = SDptr->hostdata;
1538 lun = SCptr->device->lun;
1539 target = SCptr->device->id;
1540
1541 esp->snip = 0;
1542 esp->msgout_len = 0;
1543
1544 /* Send it out whole, or piece by piece? The ESP
1545 * only knows how to automatically send out 6, 10,
1546 * and 12 byte commands. I used to think that the
1547 * Linux SCSI code would never throw anything other
1548 * than that to us, but then again there is the
1549 * SCSI generic driver which can send us anything.
1550 */
1551 esp_check_cmd(esp, SCptr);
1552
1553 /* If arbitration/selection is successful, the ESP will leave
1554 * ATN asserted, causing the target to go into message out
1555 * phase. The ESP will feed the target the identify and then
1556 * the target can only legally go to one of command,
1557 * datain/out, status, or message in phase, or stay in message
1558 * out phase (should we be trying to send a sync negotiation
1559 * message after the identify). It is not allowed to drop
1560 * BSY, but some buggy targets do and we check for this
1561 * condition in the selection complete code. Most of the time
1562 * we'll make the command bytes available to the ESP and it
1563 * will not interrupt us until it finishes command phase, we
1564 * cannot do this for command sizes the ESP does not
1565 * understand and in this case we'll get interrupted right
1566 * when the target goes into command phase.
1567 *
1568 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1569 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1570 * present on the bus we _must_ always go straight to message out
1571 * phase with an identify message for the target. Being that
1572 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1573 * selections should not confuse SCSI-1 we hope.
1574 */
1575
1576 if (esp_dev->sync) {
1577 /* this targets sync is known */
1578#ifndef __sparc_v9__
1579do_sync_known:
1580#endif
1581 if (esp_dev->disconnect)
1582 *cmdp++ = IDENTIFY(1, lun);
1583 else
1584 *cmdp++ = IDENTIFY(0, lun);
1585
1586 if (esp->esp_slowcmd) {
1587 the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
1588 esp_advance_phase(SCptr, in_slct_stop);
1589 } else {
1590 the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
1591 esp_advance_phase(SCptr, in_slct_norm);
1592 }
1593 } else if (!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) {
1594 /* After the bootup SCSI code sends both the
1595 * TEST_UNIT_READY and INQUIRY commands we want
1596 * to at least attempt allowing the device to
1597 * disconnect.
1598 */
1599 ESPMISC(("esp: Selecting device for first time. target=%d "
1600 "lun=%d\n", target, SCptr->device->lun));
1601 if (!SDptr->borken && !esp_dev->disconnect)
1602 esp_dev->disconnect = 1;
1603
1604 *cmdp++ = IDENTIFY(0, lun);
1605 esp->prevmsgout = NOP;
1606 esp_advance_phase(SCptr, in_slct_norm);
1607 the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
1608
1609 /* Take no chances... */
1610 esp_dev->sync_max_offset = 0;
1611 esp_dev->sync_min_period = 0;
1612 } else {
1613 /* Sorry, I have had way too many problems with
1614 * various CDROM devices on ESP. -DaveM
1615 */
1616 int cdrom_hwbug_wkaround = 0;
1617
1618#ifndef __sparc_v9__
1619 /* Never allow disconnects or synchronous transfers on
1620 * SparcStation1 and SparcStation1+. Allowing those
1621 * to be enabled seems to lockup the machine completely.
1622 */
1623 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
1624 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
1625 /* But we are nice and allow tapes and removable
1626 * disks (but not CDROMs) to disconnect.
1627 */
1628 if(SDptr->type == TYPE_TAPE ||
1629 (SDptr->type != TYPE_ROM && SDptr->removable))
1630 esp_dev->disconnect = 1;
1631 else
1632 esp_dev->disconnect = 0;
1633 esp_dev->sync_max_offset = 0;
1634 esp_dev->sync_min_period = 0;
1635 esp_dev->sync = 1;
1636 esp->snip = 0;
1637 goto do_sync_known;
1638 }
1639#endif /* !(__sparc_v9__) */
1640
1641 /* We've talked to this guy before,
1642 * but never negotiated. Let's try,
1643 * need to attempt WIDE first, before
1644 * sync nego, as per SCSI 2 standard.
1645 */
1646 if (esp->erev == fashme && !esp_dev->wide) {
1647 if (!SDptr->borken &&
1648 SDptr->type != TYPE_ROM &&
1649 SDptr->removable == 0) {
1650 build_wide_nego_msg(esp, 16);
1651 esp_dev->wide = 1;
1652 esp->wnip = 1;
1653 goto after_nego_msg_built;
1654 } else {
1655 esp_dev->wide = 1;
1656 /* Fall through and try sync. */
1657 }
1658 }
1659
1660 if (!SDptr->borken) {
1661 if ((SDptr->type == TYPE_ROM)) {
1662 /* Nice try sucker... */
1663 ESPMISC(("esp%d: Disabling sync for buggy "
1664 "CDROM.\n", esp->esp_id));
1665 cdrom_hwbug_wkaround = 1;
1666 build_sync_nego_msg(esp, 0, 0);
1667 } else if (SDptr->removable != 0) {
1668 ESPMISC(("esp%d: Not negotiating sync/wide but "
1669 "allowing disconnect for removable media.\n",
1670 esp->esp_id));
1671 build_sync_nego_msg(esp, 0, 0);
1672 } else {
1673 build_sync_nego_msg(esp, esp->sync_defp, 15);
1674 }
1675 } else {
1676 build_sync_nego_msg(esp, 0, 0);
1677 }
1678 esp_dev->sync = 1;
1679 esp->snip = 1;
1680
1681after_nego_msg_built:
1682 /* A fix for broken SCSI1 targets, when they disconnect
1683 * they lock up the bus and confuse ESP. So disallow
1684 * disconnects for SCSI1 targets for now until we
1685 * find a better fix.
1686 *
1687 * Addendum: This is funny, I figured out what was going
1688 * on. The blotzed SCSI1 target would disconnect,
1689 * one of the other SCSI2 targets or both would be
1690 * disconnected as well. The SCSI1 target would
1691 * stay disconnected long enough that we start
1692 * up a command on one of the SCSI2 targets. As
1693 * the ESP is arbitrating for the bus the SCSI1
1694 * target begins to arbitrate as well to reselect
1695 * the ESP. The SCSI1 target refuses to drop it's
1696 * ID bit on the data bus even though the ESP is
1697 * at ID 7 and is the obvious winner for any
1698 * arbitration. The ESP is a poor sport and refuses
1699 * to lose arbitration, it will continue indefinitely
1700 * trying to arbitrate for the bus and can only be
1701 * stopped via a chip reset or SCSI bus reset.
1702 * Therefore _no_ disconnects for SCSI1 targets
1703 * thank you very much. ;-)
1704 */
1705 if(((SDptr->scsi_level < 3) &&
1706 (SDptr->type != TYPE_TAPE) &&
1707 SDptr->removable == 0) ||
1708 cdrom_hwbug_wkaround || SDptr->borken) {
1709 ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d "
1710 "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
1711 esp_dev->disconnect = 0;
1712 *cmdp++ = IDENTIFY(0, lun);
1713 } else {
1714 *cmdp++ = IDENTIFY(1, lun);
1715 }
1716
1717 /* ESP fifo is only so big...
1718 * Make this look like a slow command.
1719 */
1720 esp->esp_slowcmd = 1;
1721 esp->esp_scmdleft = SCptr->cmd_len;
1722 esp->esp_scmdp = &SCptr->cmnd[0];
1723
1724 the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
1725 esp_advance_phase(SCptr, in_slct_msg);
1726 }
1727
1728 if (!esp->esp_slowcmd)
1729 for (i = 0; i < SCptr->cmd_len; i++)
1730 *cmdp++ = SCptr->cmnd[i];
1731
1732 /* HME sucks... */
1733 if (esp->erev == fashme)
1734 sbus_writeb((target & 0xf) | (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT),
1735 esp->eregs + ESP_BUSID);
1736 else
1737 sbus_writeb(target & 7, esp->eregs + ESP_BUSID);
1738 if (esp->prev_soff != esp_dev->sync_max_offset ||
1739 esp->prev_stp != esp_dev->sync_min_period ||
1740 (esp->erev > esp100a &&
1741 esp->prev_cfg3 != esp->config3[target])) {
1742 esp->prev_soff = esp_dev->sync_max_offset;
1743 esp->prev_stp = esp_dev->sync_min_period;
1744 sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
1745 sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
1746 if (esp->erev > esp100a) {
1747 esp->prev_cfg3 = esp->config3[target];
1748 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
1749 }
1750 }
1751 i = (cmdp - esp->esp_command);
1752
1753 if (esp->erev == fashme) {
1754 esp_cmd(esp, ESP_CMD_FLUSH); /* Grrr! */
1755
1756 /* Set up the DMA and HME counters */
1757 sbus_writeb(i, esp->eregs + ESP_TCLOW);
1758 sbus_writeb(0, esp->eregs + ESP_TCMED);
1759 sbus_writeb(0, esp->eregs + FAS_RLO);
1760 sbus_writeb(0, esp->eregs + FAS_RHI);
1761 esp_cmd(esp, the_esp_command);
1762
1763 /* Talk about touchy hardware... */
1764 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
1765 (DMA_SCSI_DISAB | DMA_ENABLE)) &
1766 ~(DMA_ST_WRITE));
1767 sbus_writel(16, esp->dregs + DMA_COUNT);
1768 sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
1769 sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
1770 } else {
1771 u32 tmp;
1772
1773 /* Set up the DMA and ESP counters */
1774 sbus_writeb(i, esp->eregs + ESP_TCLOW);
1775 sbus_writeb(0, esp->eregs + ESP_TCMED);
1776 tmp = sbus_readl(esp->dregs + DMA_CSR);
1777 tmp &= ~DMA_ST_WRITE;
1778 tmp |= DMA_ENABLE;
1779 sbus_writel(tmp, esp->dregs + DMA_CSR);
1780 if (esp->dma->revision == dvmaesc1) {
1781 if (i) /* Workaround ESC gate array SBUS rerun bug. */
1782 sbus_writel(PAGE_SIZE, esp->dregs + DMA_COUNT);
1783 }
1784 sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
1785
1786 /* Tell ESP to "go". */
1787 esp_cmd(esp, the_esp_command);
1788 }
1789}
1790
1791/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1792static int esp_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
1793{
1794 struct esp *esp;
1795
1796 /* Set up func ptr and initial driver cmd-phase. */
1797 SCpnt->scsi_done = done;
1798 SCpnt->SCp.phase = not_issued;
1799
1800 /* We use the scratch area. */
1801 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->device->lun));
1802 ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->device->lun));
1803
1804 esp = (struct esp *) SCpnt->device->host->hostdata;
1805 esp_get_dmabufs(esp, SCpnt);
1806 esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */
1807
1808 SCpnt->SCp.Status = CHECK_CONDITION;
1809 SCpnt->SCp.Message = 0xff;
1810 SCpnt->SCp.sent_command = 0;
1811
1812 /* Place into our queue. */
1813 if (SCpnt->cmnd[0] == REQUEST_SENSE) {
1814 ESPQUEUE(("RQSENSE\n"));
1815 prepend_SC(&esp->issue_SC, SCpnt);
1816 } else {
1817 ESPQUEUE(("\n"));
1818 append_SC(&esp->issue_SC, SCpnt);
1819 }
1820
1821 /* Run it now if we can. */
1822 if (!esp->current_SC && !esp->resetting_bus)
1823 esp_exec_cmd(esp);
1824
1825 return 0;
1826}
1827
1828/* Dump driver state. */
1829static void esp_dump_cmd(struct scsi_cmnd *SCptr)
1830{
1831 ESPLOG(("[tgt<%02x> lun<%02x> "
1832 "pphase<%s> cphase<%s>]",
1833 SCptr->device->id, SCptr->device->lun,
1834 phase_string(SCptr->SCp.sent_command),
1835 phase_string(SCptr->SCp.phase)));
1836}
1837
1838static void esp_dump_state(struct esp *esp)
1839{
1840 struct scsi_cmnd *SCptr = esp->current_SC;
1841#ifdef DEBUG_ESP_CMDS
1842 int i;
1843#endif
1844
1845 ESPLOG(("esp%d: dumping state\n", esp->esp_id));
1846 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1847 esp->esp_id,
1848 sbus_readl(esp->dregs + DMA_CSR),
1849 sbus_readl(esp->dregs + DMA_ADDR)));
1850 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1851 esp->esp_id, esp->sreg, esp->seqreg, esp->ireg));
1852 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1853 esp->esp_id,
1854 sbus_readb(esp->eregs + ESP_STATUS),
1855 sbus_readb(esp->eregs + ESP_SSTEP),
1856 sbus_readb(esp->eregs + ESP_INTRPT)));
1857#ifdef DEBUG_ESP_CMDS
1858 printk("esp%d: last ESP cmds [", esp->esp_id);
1859 i = (esp->espcmdent - 1) & 31;
1860 printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
1861 i = (i - 1) & 31;
1862 printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
1863 i = (i - 1) & 31;
1864 printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
1865 i = (i - 1) & 31;
1866 printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
1867 printk("]\n");
1868#endif /* (DEBUG_ESP_CMDS) */
1869
1870 if (SCptr) {
1871 ESPLOG(("esp%d: current command ", esp->esp_id));
1872 esp_dump_cmd(SCptr);
1873 }
1874 ESPLOG(("\n"));
1875 SCptr = esp->disconnected_SC;
1876 ESPLOG(("esp%d: disconnected ", esp->esp_id));
1877 while (SCptr) {
1878 esp_dump_cmd(SCptr);
1879 SCptr = (struct scsi_cmnd *) SCptr->host_scribble;
1880 }
1881 ESPLOG(("\n"));
1882}
1883
1884/* Abort a command. The host_lock is acquired by caller. */
1885static int esp_abort(struct scsi_cmnd *SCptr)
1886{
1887 struct esp *esp = (struct esp *) SCptr->device->host->hostdata;
1888 int don;
1889
1890 ESPLOG(("esp%d: Aborting command\n", esp->esp_id));
1891 esp_dump_state(esp);
1892
1893 /* Wheee, if this is the current command on the bus, the
1894 * best we can do is assert ATN and wait for msgout phase.
1895 * This should even fix a hung SCSI bus when we lose state
1896 * in the driver and timeout because the eventual phase change
1897 * will cause the ESP to (eventually) give an interrupt.
1898 */
1899 if (esp->current_SC == SCptr) {
1900 esp->cur_msgout[0] = ABORT;
1901 esp->msgout_len = 1;
1902 esp->msgout_ctr = 0;
1903 esp_cmd(esp, ESP_CMD_SATN);
1904 return SUCCESS;
1905 }
1906
1907 /* If it is still in the issue queue then we can safely
1908 * call the completion routine and report abort success.
1909 */
1910 don = (sbus_readl(esp->dregs + DMA_CSR) & DMA_INT_ENAB);
1911 if (don) {
1912 ESP_INTSOFF(esp->dregs);
1913 }
1914 if (esp->issue_SC) {
1915 struct scsi_cmnd **prev, *this;
1916 for (prev = (&esp->issue_SC), this = esp->issue_SC;
1917 this != NULL;
1918 prev = (struct scsi_cmnd **) &(this->host_scribble),
1919 this = (struct scsi_cmnd *) this->host_scribble) {
1920
1921 if (this == SCptr) {
1922 *prev = (struct scsi_cmnd *) this->host_scribble;
1923 this->host_scribble = NULL;
1924
1925 esp_release_dmabufs(esp, this);
1926 this->result = DID_ABORT << 16;
1927 this->scsi_done(this);
1928
1929 if (don)
1930 ESP_INTSON(esp->dregs);
1931
1932 return SUCCESS;
1933 }
1934 }
1935 }
1936
1937 /* Yuck, the command to abort is disconnected, it is not
1938 * worth trying to abort it now if something else is live
1939 * on the bus at this time. So, we let the SCSI code wait
1940 * a little bit and try again later.
1941 */
1942 if (esp->current_SC) {
1943 if (don)
1944 ESP_INTSON(esp->dregs);
1945 return FAILED;
1946 }
1947
1948 /* It's disconnected, we have to reconnect to re-establish
1949 * the nexus and tell the device to abort. However, we really
1950 * cannot 'reconnect' per se. Don't try to be fancy, just
1951 * indicate failure, which causes our caller to reset the whole
1952 * bus.
1953 */
1954
1955 if (don)
1956 ESP_INTSON(esp->dregs);
1957
1958 return FAILED;
1959}
1960
1961/* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1962 * arrived indicating the end of the SCSI bus reset. Our job
1963 * is to clean out the command queues and begin re-execution
1964 * of SCSI commands once more.
1965 */
1966static int esp_finish_reset(struct esp *esp)
1967{
1968 struct scsi_cmnd *sp = esp->current_SC;
1969
1970 /* Clean up currently executing command, if any. */
1971 if (sp != NULL) {
1972 esp->current_SC = NULL;
1973
1974 esp_release_dmabufs(esp, sp);
1975 sp->result = (DID_RESET << 16);
1976
1977 sp->scsi_done(sp);
1978 }
1979
1980 /* Clean up disconnected queue, they have been invalidated
1981 * by the bus reset.
1982 */
1983 if (esp->disconnected_SC) {
1984 while ((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) {
1985 esp_release_dmabufs(esp, sp);
1986 sp->result = (DID_RESET << 16);
1987
1988 sp->scsi_done(sp);
1989 }
1990 }
1991
1992 /* SCSI bus reset is complete. */
1993 esp->resetting_bus = 0;
1994 wake_up(&esp->reset_queue);
1995
1996 /* Ok, now it is safe to get commands going once more. */
1997 if (esp->issue_SC)
1998 esp_exec_cmd(esp);
1999
2000 return do_intr_end;
2001}
2002
2003static int esp_do_resetbus(struct esp *esp)
2004{
2005 ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id));
2006 esp->resetting_bus = 1;
2007 esp_cmd(esp, ESP_CMD_RS);
2008
2009 return do_intr_end;
2010}
2011
2012/* Reset ESP chip, reset hanging bus, then kill active and
2013 * disconnected commands for targets without soft reset.
2014 *
2015 * The host_lock is acquired by caller.
2016 */
2017static int esp_reset(struct scsi_cmnd *SCptr)
2018{
2019 struct esp *esp = (struct esp *) SCptr->device->host->hostdata;
2020
2021 spin_lock_irq(esp->ehost->host_lock);
2022 (void) esp_do_resetbus(esp);
2023 spin_unlock_irq(esp->ehost->host_lock);
2024
2025 wait_event(esp->reset_queue, (esp->resetting_bus == 0));
2026
2027 return SUCCESS;
2028}
2029
2030/* Internal ESP done function. */
2031static void esp_done(struct esp *esp, int error)
2032{
2033 struct scsi_cmnd *done_SC = esp->current_SC;
2034
2035 esp->current_SC = NULL;
2036
2037 esp_release_dmabufs(esp, done_SC);
2038 done_SC->result = error;
2039
2040 done_SC->scsi_done(done_SC);
2041
2042 /* Bus is free, issue any commands in the queue. */
2043 if (esp->issue_SC && !esp->current_SC)
2044 esp_exec_cmd(esp);
2045
2046}
2047
2048/* Wheee, ESP interrupt engine. */
2049
2050/* Forward declarations. */
2051static int esp_do_phase_determine(struct esp *esp);
2052static int esp_do_data_finale(struct esp *esp);
2053static int esp_select_complete(struct esp *esp);
2054static int esp_do_status(struct esp *esp);
2055static int esp_do_msgin(struct esp *esp);
2056static int esp_do_msgindone(struct esp *esp);
2057static int esp_do_msgout(struct esp *esp);
2058static int esp_do_cmdbegin(struct esp *esp);
2059
2060#define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2061#define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2062
2063/* Read any bytes found in the FAS366 fifo, storing them into
2064 * the ESP driver software state structure.
2065 */
2066static void hme_fifo_read(struct esp *esp)
2067{
2068 u8 count = 0;
2069 u8 status = esp->sreg;
2070
2071 /* Cannot safely frob the fifo for these following cases, but
2072 * we must always read the fifo when the reselect interrupt
2073 * is pending.
2074 */
2075 if (((esp->ireg & ESP_INTR_RSEL) == 0) &&
2076 (sreg_datainp(status) ||
2077 sreg_dataoutp(status) ||
2078 (esp->current_SC &&
2079 esp->current_SC->SCp.phase == in_data_done))) {
2080 ESPHME(("<wkaround_skipped>"));
2081 } else {
2082 unsigned long fcnt = sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES;
2083
2084 /* The HME stores bytes in multiples of 2 in the fifo. */
2085 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt));
2086 while (fcnt) {
2087 esp->hme_fifo_workaround_buffer[count++] =
2088 sbus_readb(esp->eregs + ESP_FDATA);
2089 esp->hme_fifo_workaround_buffer[count++] =
2090 sbus_readb(esp->eregs + ESP_FDATA);
2091 ESPHME(("<%02x,%02x>", esp->hme_fifo_workaround_buffer[count-2], esp->hme_fifo_workaround_buffer[count-1]));
2092 fcnt--;
2093 }
2094 if (sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_F1BYTE) {
2095 ESPHME(("<poke_byte>"));
2096 sbus_writeb(0, esp->eregs + ESP_FDATA);
2097 esp->hme_fifo_workaround_buffer[count++] =
2098 sbus_readb(esp->eregs + ESP_FDATA);
2099 ESPHME(("<%02x,0x00>", esp->hme_fifo_workaround_buffer[count-1]));
2100 ESPHME(("CMD_FLUSH"));
2101 esp_cmd(esp, ESP_CMD_FLUSH);
2102 } else {
2103 ESPHME(("no_xtra_byte"));
2104 }
2105 }
2106 ESPHME(("wkarnd_cnt=%d]", (int)count));
2107 esp->hme_fifo_workaround_count = count;
2108}
2109
2110static inline void hme_fifo_push(struct esp *esp, u8 *bytes, u8 count)
2111{
2112 esp_cmd(esp, ESP_CMD_FLUSH);
2113 while (count) {
2114 u8 tmp = *bytes++;
2115 sbus_writeb(tmp, esp->eregs + ESP_FDATA);
2116 sbus_writeb(0, esp->eregs + ESP_FDATA);
2117 count--;
2118 }
2119}
2120
2121/* We try to avoid some interrupts by jumping ahead and see if the ESP
2122 * has gotten far enough yet. Hence the following.
2123 */
2124static inline int skipahead1(struct esp *esp, struct scsi_cmnd *scp,
2125 int prev_phase, int new_phase)
2126{
2127 if (scp->SCp.sent_command != prev_phase)
2128 return 0;
2129 if (ESP_IRQ_P(esp->dregs)) {
2130 /* Yes, we are able to save an interrupt. */
2131 if (esp->erev == fashme)
2132 esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
2133 esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR));
2134 esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
2135 if (esp->erev == fashme) {
2136 /* This chip is really losing. */
2137 ESPHME(("HME["));
2138 /* Must latch fifo before reading the interrupt
2139 * register else garbage ends up in the FIFO
2140 * which confuses the driver utterly.
2141 * Happy Meal indeed....
2142 */
2143 ESPHME(("fifo_workaround]"));
2144 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2145 (esp->sreg2 & ESP_STAT2_F1BYTE))
2146 hme_fifo_read(esp);
2147 }
2148 if (!(esp->ireg & ESP_INTR_SR))
2149 return 0;
2150 else
2151 return do_reset_complete;
2152 }
2153 /* Ho hum, target is taking forever... */
2154 scp->SCp.sent_command = new_phase; /* so we don't recurse... */
2155 return do_intr_end;
2156}
2157
2158static inline int skipahead2(struct esp *esp, struct scsi_cmnd *scp,
2159 int prev_phase1, int prev_phase2, int new_phase)
2160{
2161 if (scp->SCp.sent_command != prev_phase1 &&
2162 scp->SCp.sent_command != prev_phase2)
2163 return 0;
2164 if (ESP_IRQ_P(esp->dregs)) {
2165 /* Yes, we are able to save an interrupt. */
2166 if (esp->erev == fashme)
2167 esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
2168 esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR));
2169 esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
2170 if (esp->erev == fashme) {
2171 /* This chip is really losing. */
2172 ESPHME(("HME["));
2173
2174 /* Must latch fifo before reading the interrupt
2175 * register else garbage ends up in the FIFO
2176 * which confuses the driver utterly.
2177 * Happy Meal indeed....
2178 */
2179 ESPHME(("fifo_workaround]"));
2180 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2181 (esp->sreg2 & ESP_STAT2_F1BYTE))
2182 hme_fifo_read(esp);
2183 }
2184 if (!(esp->ireg & ESP_INTR_SR))
2185 return 0;
2186 else
2187 return do_reset_complete;
2188 }
2189 /* Ho hum, target is taking forever... */
2190 scp->SCp.sent_command = new_phase; /* so we don't recurse... */
2191 return do_intr_end;
2192}
2193
2194/* Now some dma helpers. */
2195static void dma_setup(struct esp *esp, __u32 addr, int count, int write)
2196{
2197 u32 nreg = sbus_readl(esp->dregs + DMA_CSR);
2198
2199 if (write)
2200 nreg |= DMA_ST_WRITE;
2201 else
2202 nreg &= ~(DMA_ST_WRITE);
2203 nreg |= DMA_ENABLE;
2204 sbus_writel(nreg, esp->dregs + DMA_CSR);
2205 if (esp->dma->revision == dvmaesc1) {
2206 /* This ESC gate array sucks! */
2207 __u32 src = addr;
2208 __u32 dest = src + count;
2209
2210 if (dest & (PAGE_SIZE - 1))
2211 count = PAGE_ALIGN(count);
2212 sbus_writel(count, esp->dregs + DMA_COUNT);
2213 }
2214 sbus_writel(addr, esp->dregs + DMA_ADDR);
2215}
2216
2217static void dma_drain(struct esp *esp)
2218{
2219 u32 tmp;
2220
2221 if (esp->dma->revision == dvmahme)
2222 return;
2223 if ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_FIFO_ISDRAIN) {
2224 switch (esp->dma->revision) {
2225 default:
2226 tmp |= DMA_FIFO_STDRAIN;
2227 sbus_writel(tmp, esp->dregs + DMA_CSR);
2228
2229 case dvmarev3:
2230 case dvmaesc1:
2231 while (sbus_readl(esp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN)
2232 udelay(1);
2233 };
2234 }
2235}
2236
2237static void dma_invalidate(struct esp *esp)
2238{
2239 u32 tmp;
2240
2241 if (esp->dma->revision == dvmahme) {
2242 sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR);
2243
2244 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
2245 (DMA_PARITY_OFF | DMA_2CLKS |
2246 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
2247 ~(DMA_ST_WRITE | DMA_ENABLE));
2248
2249 sbus_writel(0, esp->dregs + DMA_CSR);
2250 sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
2251
2252 /* This is necessary to avoid having the SCSI channel
2253 * engine lock up on us.
2254 */
2255 sbus_writel(0, esp->dregs + DMA_ADDR);
2256 } else {
2257 while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ)
2258 udelay(1);
2259
2260 tmp &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
2261 tmp |= DMA_FIFO_INV;
2262 sbus_writel(tmp, esp->dregs + DMA_CSR);
2263 tmp &= ~DMA_FIFO_INV;
2264 sbus_writel(tmp, esp->dregs + DMA_CSR);
2265 }
2266}
2267
2268static inline void dma_flashclear(struct esp *esp)
2269{
2270 dma_drain(esp);
2271 dma_invalidate(esp);
2272}
2273
2274static int dma_can_transfer(struct esp *esp, struct scsi_cmnd *sp)
2275{
2276 __u32 base, end, sz;
2277
2278 if (esp->dma->revision == dvmarev3) {
2279 sz = sp->SCp.this_residual;
2280 if (sz > 0x1000000)
2281 sz = 0x1000000;
2282 } else {
2283 base = ((__u32)((unsigned long)sp->SCp.ptr));
2284 base &= (0x1000000 - 1);
2285 end = (base + sp->SCp.this_residual);
2286 if (end > 0x1000000)
2287 end = 0x1000000;
2288 sz = (end - base);
2289 }
2290 return sz;
2291}
2292
2293/* Misc. esp helper macros. */
2294#define esp_setcount(__eregs, __cnt, __hme) \
2295 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2296 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2297 if (__hme) { \
2298 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2299 sbus_writeb(0, (__eregs) + FAS_RHI); \
2300 }
2301
2302#define esp_getcount(__eregs, __hme) \
2303 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2304 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2305 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2306
2307#define fcount(__esp) \
2308 (((__esp)->erev == fashme) ? \
2309 (__esp)->hme_fifo_workaround_count : \
2310 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2311
2312#define fnzero(__esp) \
2313 (((__esp)->erev == fashme) ? 0 : \
2314 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2315
2316/* XXX speculative nops unnecessary when continuing amidst a data phase
2317 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2318 * XXX writes...
2319 */
2320#define esp_maybe_nop(__esp) \
2321 if ((__esp)->erev == esp100) \
2322 esp_cmd((__esp), ESP_CMD_NULL)
2323
2324#define sreg_to_dataphase(__sreg) \
2325 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2326
2327/* The ESP100 when in synchronous data phase, can mistake a long final
2328 * REQ pulse from the target as an extra byte, it places whatever is on
2329 * the data lines into the fifo. For now, we will assume when this
2330 * happens that the target is a bit quirky and we don't want to
2331 * be talking synchronously to it anyways. Regardless, we need to
2332 * tell the ESP to eat the extraneous byte so that we can proceed
2333 * to the next phase.
2334 */
2335static int esp100_sync_hwbug(struct esp *esp, struct scsi_cmnd *sp, int fifocnt)
2336{
2337 /* Do not touch this piece of code. */
2338 if ((!(esp->erev == esp100)) ||
2339 (!(sreg_datainp((esp->sreg = sbus_readb(esp->eregs + ESP_STATUS))) &&
2340 !fifocnt) &&
2341 !(sreg_dataoutp(esp->sreg) && !fnzero(esp)))) {
2342 if (sp->SCp.phase == in_dataout)
2343 esp_cmd(esp, ESP_CMD_FLUSH);
2344 return 0;
2345 } else {
2346 /* Async mode for this guy. */
2347 build_sync_nego_msg(esp, 0, 0);
2348
2349 /* Ack the bogus byte, but set ATN first. */
2350 esp_cmd(esp, ESP_CMD_SATN);
2351 esp_cmd(esp, ESP_CMD_MOK);
2352 return 1;
2353 }
2354}
2355
2356/* This closes the window during a selection with a reselect pending, because
2357 * we use DMA for the selection process the FIFO should hold the correct
2358 * contents if we get reselected during this process. So we just need to
2359 * ack the possible illegal cmd interrupt pending on the esp100.
2360 */
2361static inline int esp100_reconnect_hwbug(struct esp *esp)
2362{
2363 u8 tmp;
2364
2365 if (esp->erev != esp100)
2366 return 0;
2367 tmp = sbus_readb(esp->eregs + ESP_INTRPT);
2368 if (tmp & ESP_INTR_SR)
2369 return 1;
2370 return 0;
2371}
2372
2373/* This verifies the BUSID bits during a reselection so that we know which
2374 * target is talking to us.
2375 */
2376static inline int reconnect_target(struct esp *esp)
2377{
2378 int it, me = esp->scsi_id_mask, targ = 0;
2379
2380 if (2 != fcount(esp))
2381 return -1;
2382 if (esp->erev == fashme) {
2383 /* HME does not latch it's own BUS ID bits during
2384 * a reselection. Also the target number is given
2385 * as an unsigned char, not as a sole bit number
2386 * like the other ESP's do.
2387 * Happy Meal indeed....
2388 */
2389 targ = esp->hme_fifo_workaround_buffer[0];
2390 } else {
2391 it = sbus_readb(esp->eregs + ESP_FDATA);
2392 if (!(it & me))
2393 return -1;
2394 it &= ~me;
2395 if (it & (it - 1))
2396 return -1;
2397 while (!(it & 1))
2398 targ++, it >>= 1;
2399 }
2400 return targ;
2401}
2402
2403/* This verifies the identify from the target so that we know which lun is
2404 * being reconnected.
2405 */
2406static inline int reconnect_lun(struct esp *esp)
2407{
2408 int lun;
2409
2410 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)
2411 return -1;
2412 if (esp->erev == fashme)
2413 lun = esp->hme_fifo_workaround_buffer[1];
2414 else
2415 lun = sbus_readb(esp->eregs + ESP_FDATA);
2416
2417 /* Yes, you read this correctly. We report lun of zero
2418 * if we see parity error. ESP reports parity error for
2419 * the lun byte, and this is the only way to hope to recover
2420 * because the target is connected.
2421 */
2422 if (esp->sreg & ESP_STAT_PERR)
2423 return 0;
2424
2425 /* Check for illegal bits being set in the lun. */
2426 if ((lun & 0x40) || !(lun & 0x80))
2427 return -1;
2428
2429 return lun & 7;
2430}
2431
2432/* This puts the driver in a state where it can revitalize a command that
2433 * is being continued due to reselection.
2434 */
2435static inline void esp_connect(struct esp *esp, struct scsi_cmnd *sp)
2436{
2437 struct esp_device *esp_dev = sp->device->hostdata;
2438
2439 if (esp->prev_soff != esp_dev->sync_max_offset ||
2440 esp->prev_stp != esp_dev->sync_min_period ||
2441 (esp->erev > esp100a &&
2442 esp->prev_cfg3 != esp->config3[sp->device->id])) {
2443 esp->prev_soff = esp_dev->sync_max_offset;
2444 esp->prev_stp = esp_dev->sync_min_period;
2445 sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
2446 sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
2447 if (esp->erev > esp100a) {
2448 esp->prev_cfg3 = esp->config3[sp->device->id];
2449 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
2450 }
2451 }
2452 esp->current_SC = sp;
2453}
2454
2455/* This will place the current working command back into the issue queue
2456 * if we are to receive a reselection amidst a selection attempt.
2457 */
2458static inline void esp_reconnect(struct esp *esp, struct scsi_cmnd *sp)
2459{
2460 if (!esp->disconnected_SC)
2461 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2462 "command queue is empty.\n", esp->esp_id));
2463 esp->snip = 0;
2464 esp->current_SC = NULL;
2465 sp->SCp.phase = not_issued;
2466 append_SC(&esp->issue_SC, sp);
2467}
2468
2469/* Begin message in phase. */
2470static int esp_do_msgin(struct esp *esp)
2471{
2472 /* Must be very careful with the fifo on the HME */
2473 if ((esp->erev != fashme) ||
2474 !(sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_FEMPTY))
2475 esp_cmd(esp, ESP_CMD_FLUSH);
2476 esp_maybe_nop(esp);
2477 esp_cmd(esp, ESP_CMD_TI);
2478 esp->msgin_len = 1;
2479 esp->msgin_ctr = 0;
2480 esp_advance_phase(esp->current_SC, in_msgindone);
2481 return do_work_bus;
2482}
2483
2484/* This uses various DMA csr fields and the fifo flags count value to
2485 * determine how many bytes were successfully sent/received by the ESP.
2486 */
2487static inline int esp_bytes_sent(struct esp *esp, int fifo_count)
2488{
2489 int rval = sbus_readl(esp->dregs + DMA_ADDR) - esp->esp_command_dvma;
2490
2491 if (esp->dma->revision == dvmarev1)
2492 rval -= (4 - ((sbus_readl(esp->dregs + DMA_CSR) & DMA_READ_AHEAD)>>11));
2493 return rval - fifo_count;
2494}
2495
2496static inline void advance_sg(struct scsi_cmnd *sp)
2497{
2498 ++sp->SCp.buffer;
2499 --sp->SCp.buffers_residual;
2500 sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer);
2501 sp->SCp.ptr = (char *)((unsigned long)sg_dma_address(sp->SCp.buffer));
2502}
2503
2504/* Please note that the way I've coded these routines is that I _always_
2505 * check for a disconnect during any and all information transfer
2506 * phases. The SCSI standard states that the target _can_ cause a BUS
2507 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2508 * that during information transfer phases the target controls every
2509 * change in phase, the only thing the initiator can do is "ask" for
2510 * a message out phase by driving ATN true. The target can, and sometimes
2511 * will, completely ignore this request so we cannot assume anything when
2512 * we try to force a message out phase to abort/reset a target. Most of
2513 * the time the target will eventually be nice and go to message out, so
2514 * we may have to hold on to our state about what we want to tell the target
2515 * for some period of time.
2516 */
2517
2518/* I think I have things working here correctly. Even partial transfers
2519 * within a buffer or sub-buffer should not upset us at all no matter
2520 * how bad the target and/or ESP fucks things up.
2521 */
2522static int esp_do_data(struct esp *esp)
2523{
2524 struct scsi_cmnd *SCptr = esp->current_SC;
2525 int thisphase, hmuch;
2526
2527 ESPDATA(("esp_do_data: "));
2528 esp_maybe_nop(esp);
2529 thisphase = sreg_to_dataphase(esp->sreg);
2530 esp_advance_phase(SCptr, thisphase);
2531 ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT"));
2532 hmuch = dma_can_transfer(esp, SCptr);
2533 if (hmuch > (64 * 1024) && (esp->erev != fashme))
2534 hmuch = (64 * 1024);
2535 ESPDATA(("hmuch<%d> ", hmuch));
2536 esp->current_transfer_size = hmuch;
2537
2538 if (esp->erev == fashme) {
2539 u32 tmp = esp->prev_hme_dmacsr;
2540
2541 /* Always set the ESP count registers first. */
2542 esp_setcount(esp->eregs, hmuch, 1);
2543
2544 /* Get the DMA csr computed. */
2545 tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
2546 if (thisphase == in_datain)
2547 tmp |= DMA_ST_WRITE;
2548 else
2549 tmp &= ~(DMA_ST_WRITE);
2550 esp->prev_hme_dmacsr = tmp;
2551
2552 ESPDATA(("DMA|TI --> do_intr_end\n"));
2553 if (thisphase == in_datain) {
2554 sbus_writel(hmuch, esp->dregs + DMA_COUNT);
2555 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
2556 } else {
2557 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
2558 sbus_writel(hmuch, esp->dregs + DMA_COUNT);
2559 }
2560 sbus_writel((__u32)((unsigned long)SCptr->SCp.ptr), esp->dregs+DMA_ADDR);
2561 sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
2562 } else {
2563 esp_setcount(esp->eregs, hmuch, 0);
2564 dma_setup(esp, ((__u32)((unsigned long)SCptr->SCp.ptr)),
2565 hmuch, (thisphase == in_datain));
2566 ESPDATA(("DMA|TI --> do_intr_end\n"));
2567 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
2568 }
2569 return do_intr_end;
2570}
2571
2572/* See how successful the data transfer was. */
2573static int esp_do_data_finale(struct esp *esp)
2574{
2575 struct scsi_cmnd *SCptr = esp->current_SC;
2576 struct esp_device *esp_dev = SCptr->device->hostdata;
2577 int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0;
2578
2579 ESPDATA(("esp_do_data_finale: "));
2580
2581 if (SCptr->SCp.phase == in_datain) {
2582 if (esp->sreg & ESP_STAT_PERR) {
2583 /* Yuck, parity error. The ESP asserts ATN
2584 * so that we can go to message out phase
2585 * immediately and inform the target that
2586 * something bad happened.
2587 */
2588 ESPLOG(("esp%d: data bad parity detected.\n",
2589 esp->esp_id));
2590 esp->cur_msgout[0] = INITIATOR_ERROR;
2591 esp->msgout_len = 1;
2592 }
2593 dma_drain(esp);
2594 }
2595 dma_invalidate(esp);
2596
2597 /* This could happen for the above parity error case. */
2598 if (esp->ireg != ESP_INTR_BSERV) {
2599 /* Please go to msgout phase, please please please... */
2600 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2601 esp->esp_id));
2602 return esp_do_phase_determine(esp);
2603 }
2604
2605 /* Check for partial transfers and other horrible events.
2606 * Note, here we read the real fifo flags register even
2607 * on HME broken adapters because we skip the HME fifo
2608 * workaround code in esp_handle() if we are doing data
2609 * phase things. We don't want to fuck directly with
2610 * the fifo like that, especially if doing synchronous
2611 * transfers! Also, will need to double the count on
2612 * HME if we are doing wide transfers, as the HME fifo
2613 * will move and count 16-bit quantities during wide data.
2614 * SMCC _and_ Qlogic can both bite me.
2615 */
2616 fifocnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES);
2617 if (esp->erev != fashme)
2618 ecount = esp_getcount(esp->eregs, 0);
2619 bytes_sent = esp->current_transfer_size;
2620
2621 ESPDATA(("trans_sz(%d), ", bytes_sent));
2622 if (esp->erev == fashme) {
2623 if (!(esp->sreg & ESP_STAT_TCNT)) {
2624 ecount = esp_getcount(esp->eregs, 1);
2625 bytes_sent -= ecount;
2626 }
2627
2628 /* Always subtract any cruft remaining in the FIFO. */
2629 if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
2630 fifocnt <<= 1;
2631 if (SCptr->SCp.phase == in_dataout)
2632 bytes_sent -= fifocnt;
2633
2634 /* I have an IBM disk which exhibits the following
2635 * behavior during writes to it. It disconnects in
2636 * the middle of a partial transfer, the current sglist
2637 * buffer is 1024 bytes, the disk stops data transfer
2638 * at 512 bytes.
2639 *
2640 * However the FAS366 reports that 32 more bytes were
2641 * transferred than really were. This is precisely
2642 * the size of a fully loaded FIFO in wide scsi mode.
2643 * The FIFO state recorded indicates that it is empty.
2644 *
2645 * I have no idea if this is a bug in the FAS366 chip
2646 * or a bug in the firmware on this IBM disk. In any
2647 * event the following seems to be a good workaround. -DaveM
2648 */
2649 if (bytes_sent != esp->current_transfer_size &&
2650 SCptr->SCp.phase == in_dataout) {
2651 int mask = (64 - 1);
2652
2653 if ((esp->prev_cfg3 & ESP_CONFIG3_EWIDE) == 0)
2654 mask >>= 1;
2655
2656 if (bytes_sent & mask)
2657 bytes_sent -= (bytes_sent & mask);
2658 }
2659 } else {
2660 if (!(esp->sreg & ESP_STAT_TCNT))
2661 bytes_sent -= ecount;
2662 if (SCptr->SCp.phase == in_dataout)
2663 bytes_sent -= fifocnt;
2664 }
2665
2666 ESPDATA(("bytes_sent(%d), ", bytes_sent));
2667
2668 /* If we were in synchronous mode, check for peculiarities. */
2669 if (esp->erev == fashme) {
2670 if (esp_dev->sync_max_offset) {
2671 if (SCptr->SCp.phase == in_dataout)
2672 esp_cmd(esp, ESP_CMD_FLUSH);
2673 } else {
2674 esp_cmd(esp, ESP_CMD_FLUSH);
2675 }
2676 } else {
2677 if (esp_dev->sync_max_offset)
2678 bogus_data = esp100_sync_hwbug(esp, SCptr, fifocnt);
2679 else
2680 esp_cmd(esp, ESP_CMD_FLUSH);
2681 }
2682
2683 /* Until we are sure of what has happened, we are certainly
2684 * in the dark.
2685 */
2686 esp_advance_phase(SCptr, in_the_dark);
2687
2688 if (bytes_sent < 0) {
2689 /* I've seen this happen due to lost state in this
2690 * driver. No idea why it happened, but allowing
2691 * this value to be negative caused things to
2692 * lock up. This allows greater chance of recovery.
2693 * In fact every time I've seen this, it has been
2694 * a driver bug without question.
2695 */
2696 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id));
2697 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2698 esp->esp_id,
2699 esp->current_transfer_size, fifocnt, ecount));
2700 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2701 esp->esp_id,
2702 SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual));
2703 ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id,
2704 SCptr->device->id));
2705 SCptr->device->borken = 1;
2706 esp_dev->sync = 0;
2707 bytes_sent = 0;
2708 }
2709
2710 /* Update the state of our transfer. */
2711 SCptr->SCp.ptr += bytes_sent;
2712 SCptr->SCp.this_residual -= bytes_sent;
2713 if (SCptr->SCp.this_residual < 0) {
2714 /* shit */
2715 ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id));
2716 SCptr->SCp.this_residual = 0;
2717 }
2718
2719 /* Maybe continue. */
2720 if (!bogus_data) {
2721 ESPDATA(("!bogus_data, "));
2722
2723 /* NO MATTER WHAT, we advance the scatterlist,
2724 * if the target should decide to disconnect
2725 * in between scatter chunks (which is common)
2726 * we could die horribly! I used to have the sg
2727 * advance occur only if we are going back into
2728 * (or are staying in) a data phase, you can
2729 * imagine the hell I went through trying to
2730 * figure this out.
2731 */
2732 if (SCptr->use_sg && !SCptr->SCp.this_residual)
2733 advance_sg(SCptr);
2734 if (sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) {
2735 ESPDATA(("to more data\n"));
2736 return esp_do_data(esp);
2737 }
2738 ESPDATA(("to new phase\n"));
2739 return esp_do_phase_determine(esp);
2740 }
2741 /* Bogus data, just wait for next interrupt. */
2742 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2743 esp->esp_id));
2744 return do_intr_end;
2745}
2746
2747/* We received a non-good status return at the end of
2748 * running a SCSI command. This is used to decide if
2749 * we should clear our synchronous transfer state for
2750 * such a device when that happens.
2751 *
2752 * The idea is that when spinning up a disk or rewinding
2753 * a tape, we don't want to go into a loop re-negotiating
2754 * synchronous capabilities over and over.
2755 */
2756static int esp_should_clear_sync(struct scsi_cmnd *sp)
2757{
2758 u8 cmd = sp->cmnd[0];
2759
2760 /* These cases are for spinning up a disk and
2761 * waiting for that spinup to complete.
2762 */
2763 if (cmd == START_STOP)
2764 return 0;
2765
2766 if (cmd == TEST_UNIT_READY)
2767 return 0;
2768
2769 /* One more special case for SCSI tape drives,
2770 * this is what is used to probe the device for
2771 * completion of a rewind or tape load operation.
2772 */
2773 if (sp->device->type == TYPE_TAPE) {
2774 if (cmd == MODE_SENSE)
2775 return 0;
2776 }
2777
2778 return 1;
2779}
2780
2781/* Either a command is completing or a target is dropping off the bus
2782 * to continue the command in the background so we can do other work.
2783 */
2784static int esp_do_freebus(struct esp *esp)
2785{
2786 struct scsi_cmnd *SCptr = esp->current_SC;
2787 struct esp_device *esp_dev = SCptr->device->hostdata;
2788 int rval;
2789
2790 rval = skipahead2(esp, SCptr, in_status, in_msgindone, in_freeing);
2791 if (rval)
2792 return rval;
2793 if (esp->ireg != ESP_INTR_DC) {
2794 ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id));
2795 return do_reset_bus; /* target will not drop BSY... */
2796 }
2797 esp->msgout_len = 0;
2798 esp->prevmsgout = NOP;
2799 if (esp->prevmsgin == COMMAND_COMPLETE) {
2800 /* Normal end of nexus. */
2801 if (esp->disconnected_SC || (esp->erev == fashme))
2802 esp_cmd(esp, ESP_CMD_ESEL);
2803
2804 if (SCptr->SCp.Status != GOOD &&
2805 SCptr->SCp.Status != CONDITION_GOOD &&
2806 ((1<<SCptr->device->id) & esp->targets_present) &&
2807 esp_dev->sync &&
2808 esp_dev->sync_max_offset) {
2809 /* SCSI standard says that the synchronous capabilities
2810 * should be renegotiated at this point. Most likely
2811 * we are about to request sense from this target
2812 * in which case we want to avoid using sync
2813 * transfers until we are sure of the current target
2814 * state.
2815 */
2816 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2817 SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun));
2818
2819 /* But don't do this when spinning up a disk at
2820 * boot time while we poll for completion as it
2821 * fills up the console with messages. Also, tapes
2822 * can report not ready many times right after
2823 * loading up a tape.
2824 */
2825 if (esp_should_clear_sync(SCptr) != 0)
2826 esp_dev->sync = 0;
2827 }
2828 ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
2829 esp_done(esp, ((SCptr->SCp.Status & 0xff) |
2830 ((SCptr->SCp.Message & 0xff)<<8) |
2831 (DID_OK << 16)));
2832 } else if (esp->prevmsgin == DISCONNECT) {
2833 /* Normal disconnect. */
2834 esp_cmd(esp, ESP_CMD_ESEL);
2835 ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
2836 append_SC(&esp->disconnected_SC, SCptr);
2837 esp->current_SC = NULL;
2838 if (esp->issue_SC)
2839 esp_exec_cmd(esp);
2840 } else {
2841 /* Driver bug, we do not expect a disconnect here
2842 * and should not have advanced the state engine
2843 * to in_freeing.
2844 */
2845 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2846 esp->esp_id));
2847 return do_reset_bus;
2848 }
2849 return do_intr_end;
2850}
2851
2852/* When a reselect occurs, and we cannot find the command to
2853 * reconnect to in our queues, we do this.
2854 */
2855static int esp_bad_reconnect(struct esp *esp)
2856{
2857 struct scsi_cmnd *sp;
2858
2859 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2860 esp->esp_id));
2861 ESPLOG(("QUEUE DUMP\n"));
2862 sp = esp->issue_SC;
2863 ESPLOG(("esp%d: issue_SC[", esp->esp_id));
2864 while (sp) {
2865 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2866 sp = (struct scsi_cmnd *) sp->host_scribble;
2867 }
2868 ESPLOG(("]\n"));
2869 sp = esp->current_SC;
2870 ESPLOG(("esp%d: current_SC[", esp->esp_id));
2871 if (sp)
2872 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2873 else
2874 ESPLOG(("<NULL>"));
2875 ESPLOG(("]\n"));
2876 sp = esp->disconnected_SC;
2877 ESPLOG(("esp%d: disconnected_SC[", esp->esp_id));
2878 while (sp) {
2879 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2880 sp = (struct scsi_cmnd *) sp->host_scribble;
2881 }
2882 ESPLOG(("]\n"));
2883 return do_reset_bus;
2884}
2885
2886/* Do the needy when a target tries to reconnect to us. */
2887static int esp_do_reconnect(struct esp *esp)
2888{
2889 int lun, target;
2890 struct scsi_cmnd *SCptr;
2891
2892 /* Check for all bogus conditions first. */
2893 target = reconnect_target(esp);
2894 if (target < 0) {
2895 ESPDISC(("bad bus bits\n"));
2896 return do_reset_bus;
2897 }
2898 lun = reconnect_lun(esp);
2899 if (lun < 0) {
2900 ESPDISC(("target=%2x, bad identify msg\n", target));
2901 return do_reset_bus;
2902 }
2903
2904 /* Things look ok... */
2905 ESPDISC(("R<%02x,%02x>", target, lun));
2906
2907 /* Must not flush FIFO or DVMA on HME. */
2908 if (esp->erev != fashme) {
2909 esp_cmd(esp, ESP_CMD_FLUSH);
2910 if (esp100_reconnect_hwbug(esp))
2911 return do_reset_bus;
2912 esp_cmd(esp, ESP_CMD_NULL);
2913 }
2914
2915 SCptr = remove_SC(&esp->disconnected_SC, (u8) target, (u8) lun);
2916 if (!SCptr)
2917 return esp_bad_reconnect(esp);
2918
2919 esp_connect(esp, SCptr);
2920 esp_cmd(esp, ESP_CMD_MOK);
2921
2922 if (esp->erev == fashme)
2923 sbus_writeb(((SCptr->device->id & 0xf) |
2924 (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT)),
2925 esp->eregs + ESP_BUSID);
2926
2927 /* Reconnect implies a restore pointers operation. */
2928 esp_restore_pointers(esp, SCptr);
2929
2930 esp->snip = 0;
2931 esp_advance_phase(SCptr, in_the_dark);
2932 return do_intr_end;
2933}
2934
2935/* End of NEXUS (hopefully), pick up status + message byte then leave if
2936 * all goes well.
2937 */
2938static int esp_do_status(struct esp *esp)
2939{
2940 struct scsi_cmnd *SCptr = esp->current_SC;
2941 int intr, rval;
2942
2943 rval = skipahead1(esp, SCptr, in_the_dark, in_status);
2944 if (rval)
2945 return rval;
2946 intr = esp->ireg;
2947 ESPSTAT(("esp_do_status: "));
2948 if (intr != ESP_INTR_DC) {
2949 int message_out = 0; /* for parity problems */
2950
2951 /* Ack the message. */
2952 ESPSTAT(("ack msg, "));
2953 esp_cmd(esp, ESP_CMD_MOK);
2954
2955 if (esp->erev != fashme) {
2956 dma_flashclear(esp);
2957
2958 /* Wait till the first bits settle. */
2959 while (esp->esp_command[0] == 0xff)
2960 udelay(1);
2961 } else {
2962 esp->esp_command[0] = esp->hme_fifo_workaround_buffer[0];
2963 esp->esp_command[1] = esp->hme_fifo_workaround_buffer[1];
2964 }
2965
2966 ESPSTAT(("got something, "));
2967 /* ESP chimes in with one of
2968 *
2969 * 1) function done interrupt:
2970 * both status and message in bytes
2971 * are available
2972 *
2973 * 2) bus service interrupt:
2974 * only status byte was acquired
2975 *
2976 * 3) Anything else:
2977 * can't happen, but we test for it
2978 * anyways
2979 *
2980 * ALSO: If bad parity was detected on either
2981 * the status _or_ the message byte then
2982 * the ESP has asserted ATN on the bus
2983 * and we must therefore wait for the
2984 * next phase change.
2985 */
2986 if (intr & ESP_INTR_FDONE) {
2987 /* We got it all, hallejulia. */
2988 ESPSTAT(("got both, "));
2989 SCptr->SCp.Status = esp->esp_command[0];
2990 SCptr->SCp.Message = esp->esp_command[1];
2991 esp->prevmsgin = SCptr->SCp.Message;
2992 esp->cur_msgin[0] = SCptr->SCp.Message;
2993 if (esp->sreg & ESP_STAT_PERR) {
2994 /* There was bad parity for the
2995 * message byte, the status byte
2996 * was ok.
2997 */
2998 message_out = MSG_PARITY_ERROR;
2999 }
3000 } else if (intr == ESP_INTR_BSERV) {
3001 /* Only got status byte. */
3002 ESPLOG(("esp%d: got status only, ", esp->esp_id));
3003 if (!(esp->sreg & ESP_STAT_PERR)) {
3004 SCptr->SCp.Status = esp->esp_command[0];
3005 SCptr->SCp.Message = 0xff;
3006 } else {
3007 /* The status byte had bad parity.
3008 * we leave the scsi_pointer Status
3009 * field alone as we set it to a default
3010 * of CHECK_CONDITION in esp_queue.
3011 */
3012 message_out = INITIATOR_ERROR;
3013 }
3014 } else {
3015 /* This shouldn't happen ever. */
3016 ESPSTAT(("got bolixed\n"));
3017 esp_advance_phase(SCptr, in_the_dark);
3018 return esp_do_phase_determine(esp);
3019 }
3020
3021 if (!message_out) {
3022 ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status,
3023 SCptr->SCp.Message));
3024 if (SCptr->SCp.Message == COMMAND_COMPLETE) {
3025 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3026 esp_advance_phase(SCptr, in_freeing);
3027 return esp_do_freebus(esp);
3028 } else {
3029 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3030 esp->esp_id));
3031 esp->msgin_len = esp->msgin_ctr = 1;
3032 esp_advance_phase(SCptr, in_msgindone);
3033 return esp_do_msgindone(esp);
3034 }
3035 } else {
3036 /* With luck we'll be able to let the target
3037 * know that bad parity happened, it will know
3038 * which byte caused the problems and send it
3039 * again. For the case where the status byte
3040 * receives bad parity, I do not believe most
3041 * targets recover very well. We'll see.
3042 */
3043 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3044 esp->esp_id, message_out));
3045 esp->cur_msgout[0] = message_out;
3046 esp->msgout_len = esp->msgout_ctr = 1;
3047 esp_advance_phase(SCptr, in_the_dark);
3048 return esp_do_phase_determine(esp);
3049 }
3050 } else {
3051 /* If we disconnect now, all hell breaks loose. */
3052 ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id));
3053 esp_advance_phase(SCptr, in_the_dark);
3054 return esp_do_phase_determine(esp);
3055 }
3056}
3057
3058static int esp_enter_status(struct esp *esp)
3059{
3060 u8 thecmd = ESP_CMD_ICCSEQ;
3061
3062 esp_cmd(esp, ESP_CMD_FLUSH);
3063 if (esp->erev != fashme) {
3064 u32 tmp;
3065
3066 esp->esp_command[0] = esp->esp_command[1] = 0xff;
3067 sbus_writeb(2, esp->eregs + ESP_TCLOW);
3068 sbus_writeb(0, esp->eregs + ESP_TCMED);
3069 tmp = sbus_readl(esp->dregs + DMA_CSR);
3070 tmp |= (DMA_ST_WRITE | DMA_ENABLE);
3071 sbus_writel(tmp, esp->dregs + DMA_CSR);
3072 if (esp->dma->revision == dvmaesc1)
3073 sbus_writel(0x100, esp->dregs + DMA_COUNT);
3074 sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
3075 thecmd |= ESP_CMD_DMA;
3076 }
3077 esp_cmd(esp, thecmd);
3078 esp_advance_phase(esp->current_SC, in_status);
3079
3080 return esp_do_status(esp);
3081}
3082
3083static int esp_disconnect_amidst_phases(struct esp *esp)
3084{
3085 struct scsi_cmnd *sp = esp->current_SC;
3086 struct esp_device *esp_dev = sp->device->hostdata;
3087
3088 /* This means real problems if we see this
3089 * here. Unless we were actually trying
3090 * to force the device to abort/reset.
3091 */
3092 ESPLOG(("esp%d Disconnect amidst phases, ", esp->esp_id));
3093 ESPLOG(("pphase<%s> cphase<%s>, ",
3094 phase_string(sp->SCp.phase),
3095 phase_string(sp->SCp.sent_command)));
3096
3097 if (esp->disconnected_SC != NULL || (esp->erev == fashme))
3098 esp_cmd(esp, ESP_CMD_ESEL);
3099
3100 switch (esp->cur_msgout[0]) {
3101 default:
3102 /* We didn't expect this to happen at all. */
3103 ESPLOG(("device is bolixed\n"));
3104 esp_advance_phase(sp, in_tgterror);
3105 esp_done(esp, (DID_ERROR << 16));
3106 break;
3107
3108 case BUS_DEVICE_RESET:
3109 ESPLOG(("device reset successful\n"));
3110 esp_dev->sync_max_offset = 0;
3111 esp_dev->sync_min_period = 0;
3112 esp_dev->sync = 0;
3113 esp_advance_phase(sp, in_resetdev);
3114 esp_done(esp, (DID_RESET << 16));
3115 break;
3116
3117 case ABORT:
3118 ESPLOG(("device abort successful\n"));
3119 esp_advance_phase(sp, in_abortone);
3120 esp_done(esp, (DID_ABORT << 16));
3121 break;
3122
3123 };
3124 return do_intr_end;
3125}
3126
3127static int esp_enter_msgout(struct esp *esp)
3128{
3129 esp_advance_phase(esp->current_SC, in_msgout);
3130 return esp_do_msgout(esp);
3131}
3132
3133static int esp_enter_msgin(struct esp *esp)
3134{
3135 esp_advance_phase(esp->current_SC, in_msgin);
3136 return esp_do_msgin(esp);
3137}
3138
3139static int esp_enter_cmd(struct esp *esp)
3140{
3141 esp_advance_phase(esp->current_SC, in_cmdbegin);
3142 return esp_do_cmdbegin(esp);
3143}
3144
3145static int esp_enter_badphase(struct esp *esp)
3146{
3147 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id,
3148 esp->sreg & ESP_STAT_PMASK));
3149 return do_reset_bus;
3150}
3151
3152typedef int (*espfunc_t)(struct esp *);
3153
3154static espfunc_t phase_vector[] = {
3155 esp_do_data, /* ESP_DOP */
3156 esp_do_data, /* ESP_DIP */
3157 esp_enter_cmd, /* ESP_CMDP */
3158 esp_enter_status, /* ESP_STATP */
3159 esp_enter_badphase, /* ESP_STAT_PMSG */
3160 esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3161 esp_enter_msgout, /* ESP_MOP */
3162 esp_enter_msgin, /* ESP_MIP */
3163};
3164
3165/* The target has control of the bus and we have to see where it has
3166 * taken us.
3167 */
3168static int esp_do_phase_determine(struct esp *esp)
3169{
3170 if ((esp->ireg & ESP_INTR_DC) != 0)
3171 return esp_disconnect_amidst_phases(esp);
3172 return phase_vector[esp->sreg & ESP_STAT_PMASK](esp);
3173}
3174
3175/* First interrupt after exec'ing a cmd comes here. */
3176static int esp_select_complete(struct esp *esp)
3177{
3178 struct scsi_cmnd *SCptr = esp->current_SC;
3179 struct esp_device *esp_dev = SCptr->device->hostdata;
3180 int cmd_bytes_sent, fcnt;
3181
3182 if (esp->erev != fashme)
3183 esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS);
3184
3185 if (esp->erev == fashme)
3186 fcnt = esp->hme_fifo_workaround_count;
3187 else
3188 fcnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES);
3189
3190 cmd_bytes_sent = esp_bytes_sent(esp, fcnt);
3191 dma_invalidate(esp);
3192
3193 /* Let's check to see if a reselect happened
3194 * while we we're trying to select. This must
3195 * be checked first.
3196 */
3197 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
3198 esp_reconnect(esp, SCptr);
3199 return esp_do_reconnect(esp);
3200 }
3201
3202 /* Looks like things worked, we should see a bus service &
3203 * a function complete interrupt at this point. Note we
3204 * are doing a direct comparison because we don't want to
3205 * be fooled into thinking selection was successful if
3206 * ESP_INTR_DC is set, see below.
3207 */
3208 if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
3209 /* target speaks... */
3210 esp->targets_present |= (1<<SCptr->device->id);
3211
3212 /* What if the target ignores the sdtr? */
3213 if (esp->snip)
3214 esp_dev->sync = 1;
3215
3216 /* See how far, if at all, we got in getting
3217 * the information out to the target.
3218 */
3219 switch (esp->seqreg) {
3220 default:
3221
3222 case ESP_STEP_ASEL:
3223 /* Arbitration won, target selected, but
3224 * we are in some phase which is not command
3225 * phase nor is it message out phase.
3226 *
3227 * XXX We've confused the target, obviously.
3228 * XXX So clear it's state, but we also end
3229 * XXX up clearing everyone elses. That isn't
3230 * XXX so nice. I'd like to just reset this
3231 * XXX target, but if I cannot even get it's
3232 * XXX attention and finish selection to talk
3233 * XXX to it, there is not much more I can do.
3234 * XXX If we have a loaded bus we're going to
3235 * XXX spend the next second or so renegotiating
3236 * XXX for synchronous transfers.
3237 */
3238 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3239 esp->esp_id, SCptr->device->id));
3240
3241 case ESP_STEP_SID:
3242 /* Arbitration won, target selected, went
3243 * to message out phase, sent one message
3244 * byte, then we stopped. ATN is asserted
3245 * on the SCSI bus and the target is still
3246 * there hanging on. This is a legal
3247 * sequence step if we gave the ESP a select
3248 * and stop command.
3249 *
3250 * XXX See above, I could set the borken flag
3251 * XXX in the device struct and retry the
3252 * XXX command. But would that help for
3253 * XXX tagged capable targets?
3254 */
3255
3256 case ESP_STEP_NCMD:
3257 /* Arbitration won, target selected, maybe
3258 * sent the one message byte in message out
3259 * phase, but we did not go to command phase
3260 * in the end. Actually, we could have sent
3261 * only some of the message bytes if we tried
3262 * to send out the entire identify and tag
3263 * message using ESP_CMD_SA3.
3264 */
3265 cmd_bytes_sent = 0;
3266 break;
3267
3268 case ESP_STEP_PPC:
3269 /* No, not the powerPC pinhead. Arbitration
3270 * won, all message bytes sent if we went to
3271 * message out phase, went to command phase
3272 * but only part of the command was sent.
3273 *
3274 * XXX I've seen this, but usually in conjunction
3275 * XXX with a gross error which appears to have
3276 * XXX occurred between the time I told the
3277 * XXX ESP to arbitrate and when I got the
3278 * XXX interrupt. Could I have misloaded the
3279 * XXX command bytes into the fifo? Actually,
3280 * XXX I most likely missed a phase, and therefore
3281 * XXX went into never never land and didn't even
3282 * XXX know it. That was the old driver though.
3283 * XXX What is even more peculiar is that the ESP
3284 * XXX showed the proper function complete and
3285 * XXX bus service bits in the interrupt register.
3286 */
3287
3288 case ESP_STEP_FINI4:
3289 case ESP_STEP_FINI5:
3290 case ESP_STEP_FINI6:
3291 case ESP_STEP_FINI7:
3292 /* Account for the identify message */
3293 if (SCptr->SCp.phase == in_slct_norm)
3294 cmd_bytes_sent -= 1;
3295 };
3296
3297 if (esp->erev != fashme)
3298 esp_cmd(esp, ESP_CMD_NULL);
3299
3300 /* Be careful, we could really get fucked during synchronous
3301 * data transfers if we try to flush the fifo now.
3302 */
3303 if ((esp->erev != fashme) && /* not a Happy Meal and... */
3304 !fcnt && /* Fifo is empty and... */
3305 /* either we are not doing synchronous transfers or... */
3306 (!esp_dev->sync_max_offset ||
3307 /* We are not going into data in phase. */
3308 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
3309 esp_cmd(esp, ESP_CMD_FLUSH); /* flush is safe */
3310
3311 /* See how far we got if this is not a slow command. */
3312 if (!esp->esp_slowcmd) {
3313 if (cmd_bytes_sent < 0)
3314 cmd_bytes_sent = 0;
3315 if (cmd_bytes_sent != SCptr->cmd_len) {
3316 /* Crapola, mark it as a slowcmd
3317 * so that we have some chance of
3318 * keeping the command alive with
3319 * good luck.
3320 *
3321 * XXX Actually, if we didn't send it all
3322 * XXX this means either we didn't set things
3323 * XXX up properly (driver bug) or the target
3324 * XXX or the ESP detected parity on one of
3325 * XXX the command bytes. This makes much
3326 * XXX more sense, and therefore this code
3327 * XXX should be changed to send out a
3328 * XXX parity error message or if the status
3329 * XXX register shows no parity error then
3330 * XXX just expect the target to bring the
3331 * XXX bus into message in phase so that it
3332 * XXX can send us the parity error message.
3333 * XXX SCSI sucks...
3334 */
3335 esp->esp_slowcmd = 1;
3336 esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]);
3337 esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent);
3338 }
3339 }
3340
3341 /* Now figure out where we went. */
3342 esp_advance_phase(SCptr, in_the_dark);
3343 return esp_do_phase_determine(esp);
3344 }
3345
3346 /* Did the target even make it? */
3347 if (esp->ireg == ESP_INTR_DC) {
3348 /* wheee... nobody there or they didn't like
3349 * what we told it to do, clean up.
3350 */
3351
3352 /* If anyone is off the bus, but working on
3353 * a command in the background for us, tell
3354 * the ESP to listen for them.
3355 */
3356 if (esp->disconnected_SC)
3357 esp_cmd(esp, ESP_CMD_ESEL);
3358
3359 if (((1<<SCptr->device->id) & esp->targets_present) &&
3360 esp->seqreg != 0 &&
3361 (esp->cur_msgout[0] == EXTENDED_MESSAGE) &&
3362 (SCptr->SCp.phase == in_slct_msg ||
3363 SCptr->SCp.phase == in_slct_stop)) {
3364 /* shit */
3365 esp->snip = 0;
3366 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3367 "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
3368 esp_dev->sync_max_offset = 0;
3369 esp_dev->sync_min_period = 0;
3370 esp_dev->sync = 1; /* so we don't negotiate again */
3371
3372 /* Run the command again, this time though we
3373 * won't try to negotiate for synchronous transfers.
3374 *
3375 * XXX I'd like to do something like send an
3376 * XXX INITIATOR_ERROR or ABORT message to the
3377 * XXX target to tell it, "Sorry I confused you,
3378 * XXX please come back and I will be nicer next
3379 * XXX time". But that requires having the target
3380 * XXX on the bus, and it has dropped BSY on us.
3381 */
3382 esp->current_SC = NULL;
3383 esp_advance_phase(SCptr, not_issued);
3384 prepend_SC(&esp->issue_SC, SCptr);
3385 esp_exec_cmd(esp);
3386 return do_intr_end;
3387 }
3388
3389 /* Ok, this is normal, this is what we see during boot
3390 * or whenever when we are scanning the bus for targets.
3391 * But first make sure that is really what is happening.
3392 */
3393 if (((1<<SCptr->device->id) & esp->targets_present)) {
3394 ESPLOG(("esp%d: Warning, live target %d not responding to "
3395 "selection.\n", esp->esp_id, SCptr->device->id));
3396
3397 /* This _CAN_ happen. The SCSI standard states that
3398 * the target is to _not_ respond to selection if
3399 * _it_ detects bad parity on the bus for any reason.
3400 * Therefore, we assume that if we've talked successfully
3401 * to this target before, bad parity is the problem.
3402 */
3403 esp_done(esp, (DID_PARITY << 16));
3404 } else {
3405 /* Else, there really isn't anyone there. */
3406 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3407 ESPMISC(("esp: target %d lun %d\n",
3408 SCptr->device->id, SCptr->device->lun));
3409 esp_done(esp, (DID_BAD_TARGET << 16));
3410 }
3411 return do_intr_end;
3412 }
3413
3414 ESPLOG(("esp%d: Selection failure.\n", esp->esp_id));
3415 printk("esp%d: Currently -- ", esp->esp_id);
3416 esp_print_ireg(esp->ireg); printk(" ");
3417 esp_print_statreg(esp->sreg); printk(" ");
3418 esp_print_seqreg(esp->seqreg); printk("\n");
3419 printk("esp%d: New -- ", esp->esp_id);
3420 esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
3421 esp->seqreg = sbus_readb(esp->eregs + ESP_SSTEP);
3422 esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
3423 esp_print_ireg(esp->ireg); printk(" ");
3424 esp_print_statreg(esp->sreg); printk(" ");
3425 esp_print_seqreg(esp->seqreg); printk("\n");
3426 ESPLOG(("esp%d: resetting bus\n", esp->esp_id));
3427 return do_reset_bus; /* ugh... */
3428}
3429
3430/* Continue reading bytes for msgin phase. */
3431static int esp_do_msgincont(struct esp *esp)
3432{
3433 if (esp->ireg & ESP_INTR_BSERV) {
3434 /* in the right phase too? */
3435 if ((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) {
3436 /* phew... */
3437 esp_cmd(esp, ESP_CMD_TI);
3438 esp_advance_phase(esp->current_SC, in_msgindone);
3439 return do_intr_end;
3440 }
3441
3442 /* We changed phase but ESP shows bus service,
3443 * in this case it is most likely that we, the
3444 * hacker who has been up for 20hrs straight
3445 * staring at the screen, drowned in coffee
3446 * smelling like retched cigarette ashes
3447 * have miscoded something..... so, try to
3448 * recover as best we can.
3449 */
3450 ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id));
3451 }
3452 esp_advance_phase(esp->current_SC, in_the_dark);
3453 return do_phase_determine;
3454}
3455
3456static int check_singlebyte_msg(struct esp *esp)
3457{
3458 esp->prevmsgin = esp->cur_msgin[0];
3459 if (esp->cur_msgin[0] & 0x80) {
3460 /* wheee... */
3461 ESPLOG(("esp%d: target sends identify amidst phases\n",
3462 esp->esp_id));
3463 esp_advance_phase(esp->current_SC, in_the_dark);
3464 return 0;
3465 } else if (((esp->cur_msgin[0] & 0xf0) == 0x20) ||
3466 (esp->cur_msgin[0] == EXTENDED_MESSAGE)) {
3467 esp->msgin_len = 2;
3468 esp_advance_phase(esp->current_SC, in_msgincont);
3469 return 0;
3470 }
3471 esp_advance_phase(esp->current_SC, in_the_dark);
3472 switch (esp->cur_msgin[0]) {
3473 default:
3474 /* We don't want to hear about it. */
3475 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id,
3476 esp->cur_msgin[0]));
3477 return MESSAGE_REJECT;
3478
3479 case NOP:
3480 ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id,
3481 esp->current_SC->device->id));
3482 return 0;
3483
3484 case RESTORE_POINTERS:
3485 /* In this case we might also have to backup the
3486 * "slow command" pointer. It is rare to get such
3487 * a save/restore pointer sequence so early in the
3488 * bus transition sequences, but cover it.
3489 */
3490 if (esp->esp_slowcmd) {
3491 esp->esp_scmdleft = esp->current_SC->cmd_len;
3492 esp->esp_scmdp = &esp->current_SC->cmnd[0];
3493 }
3494 esp_restore_pointers(esp, esp->current_SC);
3495 return 0;
3496
3497 case SAVE_POINTERS:
3498 esp_save_pointers(esp, esp->current_SC);
3499 return 0;
3500
3501 case COMMAND_COMPLETE:
3502 case DISCONNECT:
3503 /* Freeing the bus, let it go. */
3504 esp->current_SC->SCp.phase = in_freeing;
3505 return 0;
3506
3507 case MESSAGE_REJECT:
3508 ESPMISC(("msg reject, "));
3509 if (esp->prevmsgout == EXTENDED_MESSAGE) {
3510 struct esp_device *esp_dev = esp->current_SC->device->hostdata;
3511
3512 /* Doesn't look like this target can
3513 * do synchronous or WIDE transfers.
3514 */
3515 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3516 esp_dev->sync = 1;
3517 esp_dev->wide = 1;
3518 esp_dev->sync_min_period = 0;
3519 esp_dev->sync_max_offset = 0;
3520 return 0;
3521 } else {
3522 ESPMISC(("not sync nego, sending ABORT\n"));
3523 return ABORT;
3524 }
3525 };
3526}
3527
3528/* Target negotiates for synchronous transfers before we do, this
3529 * is legal although very strange. What is even funnier is that
3530 * the SCSI2 standard specifically recommends against targets doing
3531 * this because so many initiators cannot cope with this occurring.
3532 */
3533static int target_with_ants_in_pants(struct esp *esp,
3534 struct scsi_cmnd *SCptr,
3535 struct esp_device *esp_dev)
3536{
3537 if (esp_dev->sync || SCptr->device->borken) {
3538 /* sorry, no can do */
3539 ESPSDTR(("forcing to async, "));
3540 build_sync_nego_msg(esp, 0, 0);
3541 esp_dev->sync = 1;
3542 esp->snip = 1;
3543 ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id));
3544 esp_advance_phase(SCptr, in_the_dark);
3545 return EXTENDED_MESSAGE;
3546 }
3547
3548 /* Ok, we'll check them out... */
3549 return 0;
3550}
3551
3552static void sync_report(struct esp *esp)
3553{
3554 int msg3, msg4;
3555 char *type;
3556
3557 msg3 = esp->cur_msgin[3];
3558 msg4 = esp->cur_msgin[4];
3559 if (msg4) {
3560 int hz = 1000000000 / (msg3 * 4);
3561 int integer = hz / 1000000;
3562 int fraction = (hz - (integer * 1000000)) / 10000;
3563 if ((esp->erev == fashme) &&
3564 (esp->config3[esp->current_SC->device->id] & ESP_CONFIG3_EWIDE)) {
3565 type = "FAST-WIDE";
3566 integer <<= 1;
3567 fraction <<= 1;
3568 } else if ((msg3 * 4) < 200) {
3569 type = "FAST";
3570 } else {
3571 type = "synchronous";
3572 }
3573
3574 /* Do not transform this back into one big printk
3575 * again, it triggers a bug in our sparc64-gcc272
3576 * sibling call optimization. -DaveM
3577 */
3578 ESPLOG((KERN_INFO "esp%d: target %d ",
3579 esp->esp_id, esp->current_SC->device->id));
3580 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3581 (int) msg3 * 4, (int) msg4,
3582 integer, fraction));
3583 ESPLOG(("%s SCSI%s]\n", type,
3584 (((msg3 * 4) < 200) ? "-II" : "")));
3585 } else {
3586 ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n",
3587 esp->esp_id, esp->current_SC->device->id));
3588 }
3589}
3590
3591static int check_multibyte_msg(struct esp *esp)
3592{
3593 struct scsi_cmnd *SCptr = esp->current_SC;
3594 struct esp_device *esp_dev = SCptr->device->hostdata;
3595 u8 regval = 0;
3596 int message_out = 0;
3597
3598 ESPSDTR(("chk multibyte msg: "));
3599 if (esp->cur_msgin[2] == EXTENDED_SDTR) {
3600 int period = esp->cur_msgin[3];
3601 int offset = esp->cur_msgin[4];
3602
3603 ESPSDTR(("is sync nego response, "));
3604 if (!esp->snip) {
3605 int rval;
3606
3607 /* Target negotiates first! */
3608 ESPSDTR(("target jumps the gun, "));
3609 message_out = EXTENDED_MESSAGE; /* we must respond */
3610 rval = target_with_ants_in_pants(esp, SCptr, esp_dev);
3611 if (rval)
3612 return rval;
3613 }
3614
3615 ESPSDTR(("examining sdtr, "));
3616
3617 /* Offset cannot be larger than ESP fifo size. */
3618 if (offset > 15) {
3619 ESPSDTR(("offset too big %2x, ", offset));
3620 offset = 15;
3621 ESPSDTR(("sending back new offset\n"));
3622 build_sync_nego_msg(esp, period, offset);
3623 return EXTENDED_MESSAGE;
3624 }
3625
3626 if (offset && period > esp->max_period) {
3627 /* Yeee, async for this slow device. */
3628 ESPSDTR(("period too long %2x, ", period));
3629 build_sync_nego_msg(esp, 0, 0);
3630 ESPSDTR(("hoping for msgout\n"));
3631 esp_advance_phase(esp->current_SC, in_the_dark);
3632 return EXTENDED_MESSAGE;
3633 } else if (offset && period < esp->min_period) {
3634 ESPSDTR(("period too short %2x, ", period));
3635 period = esp->min_period;
3636 if (esp->erev > esp236)
3637 regval = 4;
3638 else
3639 regval = 5;
3640 } else if (offset) {
3641 int tmp;
3642
3643 ESPSDTR(("period is ok, "));
3644 tmp = esp->ccycle / 1000;
3645 regval = (((period << 2) + tmp - 1) / tmp);
3646 if (regval && ((esp->erev == fas100a ||
3647 esp->erev == fas236 ||
3648 esp->erev == fashme))) {
3649 if (period >= 50)
3650 regval--;
3651 }
3652 }
3653
3654 if (offset) {
3655 u8 bit;
3656
3657 esp_dev->sync_min_period = (regval & 0x1f);
3658 esp_dev->sync_max_offset = (offset | esp->radelay);
3659 if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) {
3660 if ((esp->erev == fas100a) || (esp->erev == fashme))
3661 bit = ESP_CONFIG3_FAST;
3662 else
3663 bit = ESP_CONFIG3_FSCSI;
3664 if (period < 50) {
3665 /* On FAS366, if using fast-20 synchronous transfers
3666 * we need to make sure the REQ/ACK assert/deassert
3667 * control bits are clear.
3668 */
3669 if (esp->erev == fashme)
3670 esp_dev->sync_max_offset &= ~esp->radelay;
3671 esp->config3[SCptr->device->id] |= bit;
3672 } else {
3673 esp->config3[SCptr->device->id] &= ~bit;
3674 }
3675 esp->prev_cfg3 = esp->config3[SCptr->device->id];
3676 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
3677 }
3678 esp->prev_soff = esp_dev->sync_max_offset;
3679 esp->prev_stp = esp_dev->sync_min_period;
3680 sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
3681 sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
3682 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3683 esp_dev->sync_max_offset,
3684 esp_dev->sync_min_period,
3685 esp->config3[SCptr->device->id]));
3686
3687 esp->snip = 0;
3688 } else if (esp_dev->sync_max_offset) {
3689 u8 bit;
3690
3691 /* back to async mode */
3692 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3693 esp_dev->sync_max_offset = 0;
3694 esp_dev->sync_min_period = 0;
3695 esp->prev_soff = 0;
3696 esp->prev_stp = 0;
3697 sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
3698 sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
3699 if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) {
3700 if ((esp->erev == fas100a) || (esp->erev == fashme))
3701 bit = ESP_CONFIG3_FAST;
3702 else
3703 bit = ESP_CONFIG3_FSCSI;
3704 esp->config3[SCptr->device->id] &= ~bit;
3705 esp->prev_cfg3 = esp->config3[SCptr->device->id];
3706 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
3707 }
3708 }
3709
3710 sync_report(esp);
3711
3712 ESPSDTR(("chk multibyte msg: sync is known, "));
3713 esp_dev->sync = 1;
3714
3715 if (message_out) {
3716 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3717 esp->esp_id));
3718 build_sync_nego_msg(esp, period, offset);
3719 esp_advance_phase(SCptr, in_the_dark);
3720 return EXTENDED_MESSAGE;
3721 }
3722
3723 ESPSDTR(("returning zero\n"));
3724 esp_advance_phase(SCptr, in_the_dark); /* ...or else! */
3725 return 0;
3726 } else if (esp->cur_msgin[2] == EXTENDED_WDTR) {
3727 int size = 8 << esp->cur_msgin[3];
3728
3729 esp->wnip = 0;
3730 if (esp->erev != fashme) {
3731 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3732 esp->esp_id));
3733 message_out = MESSAGE_REJECT;
3734 } else if (size > 16) {
3735 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3736 "not supported.\n", esp->esp_id, size));
3737 message_out = MESSAGE_REJECT;
3738 } else {
3739 /* Things look good; let's see what we got. */
3740 if (size == 16) {
3741 /* Set config 3 register for this target. */
3742 esp->config3[SCptr->device->id] |= ESP_CONFIG3_EWIDE;
3743 } else {
3744 /* Just make sure it was one byte sized. */
3745 if (size != 8) {
3746 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3747 esp->esp_id, size));
3748 message_out = MESSAGE_REJECT;
3749 goto finish;
3750 }
3751 /* Pure paranoia. */
3752 esp->config3[SCptr->device->id] &= ~(ESP_CONFIG3_EWIDE);
3753 }
3754 esp->prev_cfg3 = esp->config3[SCptr->device->id];
3755 sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
3756
3757 /* Regardless, next try for sync transfers. */
3758 build_sync_nego_msg(esp, esp->sync_defp, 15);
3759 esp_dev->sync = 1;
3760 esp->snip = 1;
3761 message_out = EXTENDED_MESSAGE;
3762 }
3763 } else if (esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) {
3764 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id));
3765 message_out = MESSAGE_REJECT;
3766 }
3767finish:
3768 esp_advance_phase(SCptr, in_the_dark);
3769 return message_out;
3770}
3771
3772static int esp_do_msgindone(struct esp *esp)
3773{
3774 struct scsi_cmnd *SCptr = esp->current_SC;
3775 int message_out = 0, it = 0, rval;
3776
3777 rval = skipahead1(esp, SCptr, in_msgin, in_msgindone);
3778 if (rval)
3779 return rval;
3780 if (SCptr->SCp.sent_command != in_status) {
3781 if (!(esp->ireg & ESP_INTR_DC)) {
3782 if (esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) {
3783 message_out = MSG_PARITY_ERROR;
3784 esp_cmd(esp, ESP_CMD_FLUSH);
3785 } else if (esp->erev != fashme &&
3786 (it = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES)) != 1) {
3787 /* We certainly dropped the ball somewhere. */
3788 message_out = INITIATOR_ERROR;
3789 esp_cmd(esp, ESP_CMD_FLUSH);
3790 } else if (!esp->msgin_len) {
3791 if (esp->erev == fashme)
3792 it = esp->hme_fifo_workaround_buffer[0];
3793 else
3794 it = sbus_readb(esp->eregs + ESP_FDATA);
3795 esp_advance_phase(SCptr, in_msgincont);
3796 } else {
3797 /* it is ok and we want it */
3798 if (esp->erev == fashme)
3799 it = esp->cur_msgin[esp->msgin_ctr] =
3800 esp->hme_fifo_workaround_buffer[0];
3801 else
3802 it = esp->cur_msgin[esp->msgin_ctr] =
3803 sbus_readb(esp->eregs + ESP_FDATA);
3804 esp->msgin_ctr++;
3805 }
3806 } else {
3807 esp_advance_phase(SCptr, in_the_dark);
3808 return do_work_bus;
3809 }
3810 } else {
3811 it = esp->cur_msgin[0];
3812 }
3813 if (!message_out && esp->msgin_len) {
3814 if (esp->msgin_ctr < esp->msgin_len) {
3815 esp_advance_phase(SCptr, in_msgincont);
3816 } else if (esp->msgin_len == 1) {
3817 message_out = check_singlebyte_msg(esp);
3818 } else if (esp->msgin_len == 2) {
3819 if (esp->cur_msgin[0] == EXTENDED_MESSAGE) {
3820 if ((it + 2) >= 15) {
3821 message_out = MESSAGE_REJECT;
3822 } else {
3823 esp->msgin_len = (it + 2);
3824 esp_advance_phase(SCptr, in_msgincont);
3825 }
3826 } else {
3827 message_out = MESSAGE_REJECT; /* foo on you */
3828 }
3829 } else {
3830 message_out = check_multibyte_msg(esp);
3831 }
3832 }
3833 if (message_out < 0) {
3834 return -message_out;
3835 } else if (message_out) {
3836 if (((message_out != 1) &&
3837 ((message_out < 0x20) || (message_out & 0x80))))
3838 esp->msgout_len = 1;
3839 esp->cur_msgout[0] = message_out;
3840 esp_cmd(esp, ESP_CMD_SATN);
3841 esp_advance_phase(SCptr, in_the_dark);
3842 esp->msgin_len = 0;
3843 }
3844 esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
3845 esp->sreg &= ~(ESP_STAT_INTR);
3846 if ((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD))
3847 esp_cmd(esp, ESP_CMD_MOK);
3848 if ((SCptr->SCp.sent_command == in_msgindone) &&
3849 (SCptr->SCp.phase == in_freeing))
3850 return esp_do_freebus(esp);
3851 return do_intr_end;
3852}
3853
3854static int esp_do_cmdbegin(struct esp *esp)
3855{
3856 struct scsi_cmnd *SCptr = esp->current_SC;
3857
3858 esp_advance_phase(SCptr, in_cmdend);
3859 if (esp->erev == fashme) {
3860 u32 tmp = sbus_readl(esp->dregs + DMA_CSR);
3861 int i;
3862
3863 for (i = 0; i < esp->esp_scmdleft; i++)
3864 esp->esp_command[i] = *esp->esp_scmdp++;
3865 esp->esp_scmdleft = 0;
3866 esp_cmd(esp, ESP_CMD_FLUSH);
3867 esp_setcount(esp->eregs, i, 1);
3868 esp_cmd(esp, (ESP_CMD_DMA | ESP_CMD_TI));
3869 tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
3870 tmp &= ~(DMA_ST_WRITE);
3871 sbus_writel(i, esp->dregs + DMA_COUNT);
3872 sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
3873 sbus_writel(tmp, esp->dregs + DMA_CSR);
3874 } else {
3875 u8 tmp;
3876
3877 esp_cmd(esp, ESP_CMD_FLUSH);
3878 tmp = *esp->esp_scmdp++;
3879 esp->esp_scmdleft--;
3880 sbus_writeb(tmp, esp->eregs + ESP_FDATA);
3881 esp_cmd(esp, ESP_CMD_TI);
3882 }
3883 return do_intr_end;
3884}
3885
3886static int esp_do_cmddone(struct esp *esp)
3887{
3888 if (esp->erev == fashme)
3889 dma_invalidate(esp);
3890 else
3891 esp_cmd(esp, ESP_CMD_NULL);
3892
3893 if (esp->ireg & ESP_INTR_BSERV) {
3894 esp_advance_phase(esp->current_SC, in_the_dark);
3895 return esp_do_phase_determine(esp);
3896 }
3897
3898 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3899 esp->esp_id));
3900 return do_reset_bus;
3901}
3902
3903static int esp_do_msgout(struct esp *esp)
3904{
3905 esp_cmd(esp, ESP_CMD_FLUSH);
3906 switch (esp->msgout_len) {
3907 case 1:
3908 if (esp->erev == fashme)
3909 hme_fifo_push(esp, &esp->cur_msgout[0], 1);
3910 else
3911 sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA);
3912
3913 esp_cmd(esp, ESP_CMD_TI);
3914 break;
3915
3916 case 2:
3917 esp->esp_command[0] = esp->cur_msgout[0];
3918 esp->esp_command[1] = esp->cur_msgout[1];
3919
3920 if (esp->erev == fashme) {
3921 hme_fifo_push(esp, &esp->cur_msgout[0], 2);
3922 esp_cmd(esp, ESP_CMD_TI);
3923 } else {
3924 dma_setup(esp, esp->esp_command_dvma, 2, 0);
3925 esp_setcount(esp->eregs, 2, 0);
3926 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
3927 }
3928 break;
3929
3930 case 4:
3931 esp->esp_command[0] = esp->cur_msgout[0];
3932 esp->esp_command[1] = esp->cur_msgout[1];
3933 esp->esp_command[2] = esp->cur_msgout[2];
3934 esp->esp_command[3] = esp->cur_msgout[3];
3935 esp->snip = 1;
3936
3937 if (esp->erev == fashme) {
3938 hme_fifo_push(esp, &esp->cur_msgout[0], 4);
3939 esp_cmd(esp, ESP_CMD_TI);
3940 } else {
3941 dma_setup(esp, esp->esp_command_dvma, 4, 0);
3942 esp_setcount(esp->eregs, 4, 0);
3943 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
3944 }
3945 break;
3946
3947 case 5:
3948 esp->esp_command[0] = esp->cur_msgout[0];
3949 esp->esp_command[1] = esp->cur_msgout[1];
3950 esp->esp_command[2] = esp->cur_msgout[2];
3951 esp->esp_command[3] = esp->cur_msgout[3];
3952 esp->esp_command[4] = esp->cur_msgout[4];
3953 esp->snip = 1;
3954
3955 if (esp->erev == fashme) {
3956 hme_fifo_push(esp, &esp->cur_msgout[0], 5);
3957 esp_cmd(esp, ESP_CMD_TI);
3958 } else {
3959 dma_setup(esp, esp->esp_command_dvma, 5, 0);
3960 esp_setcount(esp->eregs, 5, 0);
3961 esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
3962 }
3963 break;
3964
3965 default:
3966 /* whoops */
3967 ESPMISC(("bogus msgout sending NOP\n"));
3968 esp->cur_msgout[0] = NOP;
3969
3970 if (esp->erev == fashme) {
3971 hme_fifo_push(esp, &esp->cur_msgout[0], 1);
3972 } else {
3973 sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA);
3974 }
3975
3976 esp->msgout_len = 1;
3977 esp_cmd(esp, ESP_CMD_TI);
3978 break;
3979 };
3980
3981 esp_advance_phase(esp->current_SC, in_msgoutdone);
3982 return do_intr_end;
3983}
3984
3985static int esp_do_msgoutdone(struct esp *esp)
3986{
3987 if (esp->msgout_len > 1) {
3988 /* XXX HME/FAS ATN deassert workaround required,
3989 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
3990 * XXX to kill the fifo.
3991 */
3992 if (esp->erev != fashme) {
3993 u32 tmp;
3994
3995 while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ)
3996 udelay(1);
3997 tmp &= ~DMA_ENABLE;
3998 sbus_writel(tmp, esp->dregs + DMA_CSR);
3999 dma_invalidate(esp);
4000 } else {
4001 esp_cmd(esp, ESP_CMD_FLUSH);
4002 }
4003 }
4004 if (!(esp->ireg & ESP_INTR_DC)) {
4005 if (esp->erev != fashme)
4006 esp_cmd(esp, ESP_CMD_NULL);
4007 switch (esp->sreg & ESP_STAT_PMASK) {
4008 case ESP_MOP:
4009 /* whoops, parity error */
4010 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4011 esp->esp_id));
4012 if (esp->msgout_len > 1)
4013 esp_cmd(esp, ESP_CMD_SATN);
4014 esp_advance_phase(esp->current_SC, in_msgout);
4015 return do_work_bus;
4016
4017 case ESP_DIP:
4018 break;
4019
4020 default:
4021 /* Happy Meal fifo is touchy... */
4022 if ((esp->erev != fashme) &&
4023 !fcount(esp) &&
4024 !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset))
4025 esp_cmd(esp, ESP_CMD_FLUSH);
4026 break;
4027
4028 };
4029 } else {
4030 ESPLOG(("esp%d: disconnect, resetting bus\n", esp->esp_id));
4031 return do_reset_bus;
4032 }
4033
4034 /* If we sent out a synchronous negotiation message, update
4035 * our state.
4036 */
4037 if (esp->cur_msgout[2] == EXTENDED_MESSAGE &&
4038 esp->cur_msgout[4] == EXTENDED_SDTR) {
4039 esp->snip = 1; /* anal retentiveness... */
4040 }
4041
4042 esp->prevmsgout = esp->cur_msgout[0];
4043 esp->msgout_len = 0;
4044 esp_advance_phase(esp->current_SC, in_the_dark);
4045 return esp_do_phase_determine(esp);
4046}
4047
4048static int esp_bus_unexpected(struct esp *esp)
4049{
4050 ESPLOG(("esp%d: command in weird state %2x\n",
4051 esp->esp_id, esp->current_SC->SCp.phase));
4052 return do_reset_bus;
4053}
4054
4055static espfunc_t bus_vector[] = {
4056 esp_do_data_finale,
4057 esp_do_data_finale,
4058 esp_bus_unexpected,
4059 esp_do_msgin,
4060 esp_do_msgincont,
4061 esp_do_msgindone,
4062 esp_do_msgout,
4063 esp_do_msgoutdone,
4064 esp_do_cmdbegin,
4065 esp_do_cmddone,
4066 esp_do_status,
4067 esp_do_freebus,
4068 esp_do_phase_determine,
4069 esp_bus_unexpected,
4070 esp_bus_unexpected,
4071 esp_bus_unexpected,
4072};
4073
4074/* This is the second tier in our dual-level SCSI state machine. */
4075static int esp_work_bus(struct esp *esp)
4076{
4077 struct scsi_cmnd *SCptr = esp->current_SC;
4078 unsigned int phase;
4079
4080 ESPBUS(("esp_work_bus: "));
4081 if (!SCptr) {
4082 ESPBUS(("reconnect\n"));
4083 return esp_do_reconnect(esp);
4084 }
4085 phase = SCptr->SCp.phase;
4086 if ((phase & 0xf0) == in_phases_mask)
4087 return bus_vector[(phase & 0x0f)](esp);
4088 else if ((phase & 0xf0) == in_slct_mask)
4089 return esp_select_complete(esp);
4090 else
4091 return esp_bus_unexpected(esp);
4092}
4093
4094static espfunc_t isvc_vector[] = {
4095 NULL,
4096 esp_do_phase_determine,
4097 esp_do_resetbus,
4098 esp_finish_reset,
4099 esp_work_bus
4100};
4101
4102/* Main interrupt handler for an esp adapter. */
4103static void esp_handle(struct esp *esp)
4104{
4105 struct scsi_cmnd *SCptr;
4106 int what_next = do_intr_end;
4107
4108 SCptr = esp->current_SC;
4109
4110 /* Check for errors. */
4111 esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
4112 esp->sreg &= (~ESP_STAT_INTR);
4113 if (esp->erev == fashme) {
4114 esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
4115 esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS);
4116 }
4117
4118 if (esp->sreg & (ESP_STAT_SPAM)) {
4119 /* Gross error, could be due to one of:
4120 *
4121 * - top of fifo overwritten, could be because
4122 * we tried to do a synchronous transfer with
4123 * an offset greater than ESP fifo size
4124 *
4125 * - top of command register overwritten
4126 *
4127 * - DMA setup to go in one direction, SCSI
4128 * bus points in the other, whoops
4129 *
4130 * - weird phase change during asynchronous
4131 * data phase while we are initiator
4132 */
4133 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg));
4134
4135 /* If a command is live on the bus we cannot safely
4136 * reset the bus, so we'll just let the pieces fall
4137 * where they may. Here we are hoping that the
4138 * target will be able to cleanly go away soon
4139 * so we can safely reset things.
4140 */
4141 if (!SCptr) {
4142 ESPLOG(("esp%d: No current cmd during gross error, "
4143 "resetting bus\n", esp->esp_id));
4144 what_next = do_reset_bus;
4145 goto state_machine;
4146 }
4147 }
4148
4149 if (sbus_readl(esp->dregs + DMA_CSR) & DMA_HNDL_ERROR) {
4150 /* A DMA gate array error. Here we must
4151 * be seeing one of two things. Either the
4152 * virtual to physical address translation
4153 * on the SBUS could not occur, else the
4154 * translation it did get pointed to a bogus
4155 * page. Ho hum...
4156 */
4157 ESPLOG(("esp%d: DMA error %08x\n", esp->esp_id,
4158 sbus_readl(esp->dregs + DMA_CSR)));
4159
4160 /* DMA gate array itself must be reset to clear the
4161 * error condition.
4162 */
4163 esp_reset_dma(esp);
4164
4165 what_next = do_reset_bus;
4166 goto state_machine;
4167 }
4168
4169 esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); /* Unlatch intr reg */
4170
4171 if (esp->erev == fashme) {
4172 /* This chip is really losing. */
4173 ESPHME(("HME["));
4174
4175 ESPHME(("sreg2=%02x,", esp->sreg2));
4176 /* Must latch fifo before reading the interrupt
4177 * register else garbage ends up in the FIFO
4178 * which confuses the driver utterly.
4179 */
4180 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
4181 (esp->sreg2 & ESP_STAT2_F1BYTE)) {
4182 ESPHME(("fifo_workaround]"));
4183 hme_fifo_read(esp);
4184 } else {
4185 ESPHME(("no_fifo_workaround]"));
4186 }
4187 }
4188
4189 /* No current cmd is only valid at this point when there are
4190 * commands off the bus or we are trying a reset.
4191 */
4192 if (!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) {
4193 /* Panic is safe, since current_SC is null. */
4194 ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id));
4195 panic("esp_handle: current_SC == penguin within interrupt!");
4196 }
4197
4198 if (esp->ireg & (ESP_INTR_IC)) {
4199 /* Illegal command fed to ESP. Outside of obvious
4200 * software bugs that could cause this, there is
4201 * a condition with esp100 where we can confuse the
4202 * ESP into an erroneous illegal command interrupt
4203 * because it does not scrape the FIFO properly
4204 * for reselection. See esp100_reconnect_hwbug()
4205 * to see how we try very hard to avoid this.
4206 */
4207 ESPLOG(("esp%d: invalid command\n", esp->esp_id));
4208
4209 esp_dump_state(esp);
4210
4211 if (SCptr != NULL) {
4212 /* Devices with very buggy firmware can drop BSY
4213 * during a scatter list interrupt when using sync
4214 * mode transfers. We continue the transfer as
4215 * expected, the target drops the bus, the ESP
4216 * gets confused, and we get a illegal command
4217 * interrupt because the bus is in the disconnected
4218 * state now and ESP_CMD_TI is only allowed when
4219 * a nexus is alive on the bus.
4220 */
4221 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4222 "target %d\n", esp->esp_id, SCptr->device->id));
4223 SCptr->device->borken = 1; /* foo on you */
4224 }
4225
4226 what_next = do_reset_bus;
4227 } else if (!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) {
4228 if (SCptr) {
4229 unsigned int phase = SCptr->SCp.phase;
4230
4231 if (phase & in_phases_mask) {
4232 what_next = esp_work_bus(esp);
4233 } else if (phase & in_slct_mask) {
4234 what_next = esp_select_complete(esp);
4235 } else {
4236 ESPLOG(("esp%d: interrupt for no good reason...\n",
4237 esp->esp_id));
4238 what_next = do_intr_end;
4239 }
4240 } else {
4241 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4242 esp->esp_id));
4243 what_next = do_reset_bus;
4244 }
4245 } else if (esp->ireg & ESP_INTR_SR) {
4246 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id));
4247 what_next = do_reset_complete;
4248 } else if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) {
4249 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4250 esp->esp_id));
4251 what_next = do_reset_bus;
4252 } else if (esp->ireg & ESP_INTR_RSEL) {
4253 if (SCptr == NULL) {
4254 /* This is ok. */
4255 what_next = esp_do_reconnect(esp);
4256 } else if (SCptr->SCp.phase & in_slct_mask) {
4257 /* Only selection code knows how to clean
4258 * up properly.
4259 */
4260 ESPDISC(("Reselected during selection attempt\n"));
4261 what_next = esp_select_complete(esp);
4262 } else {
4263 ESPLOG(("esp%d: Reselected while bus is busy\n",
4264 esp->esp_id));
4265 what_next = do_reset_bus;
4266 }
4267 }
4268
4269 /* This is tier-one in our dual level SCSI state machine. */
4270state_machine:
4271 while (what_next != do_intr_end) {
4272 if (what_next >= do_phase_determine &&
4273 what_next < do_intr_end) {
4274 what_next = isvc_vector[what_next](esp);
4275 } else {
4276 /* state is completely lost ;-( */
4277 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4278 esp->esp_id));
4279 what_next = do_reset_bus;
4280 }
4281 }
4282}
4283
4284/* Service only the ESP described by dev_id. */
4285static irqreturn_t esp_intr(int irq, void *dev_id)
4286{
4287 struct esp *esp = dev_id;
4288 unsigned long flags;
4289
4290 spin_lock_irqsave(esp->ehost->host_lock, flags);
4291 if (ESP_IRQ_P(esp->dregs)) {
4292 ESP_INTSOFF(esp->dregs);
4293
4294 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp->esp_id));
4295 esp_handle(esp);
4296 ESPIRQ((")"));
4297
4298 ESP_INTSON(esp->dregs);
4299 }
4300 spin_unlock_irqrestore(esp->ehost->host_lock, flags);
4301
4302 return IRQ_HANDLED;
4303}
4304
4305static int esp_slave_alloc(struct scsi_device *SDptr)
4306{
4307 struct esp_device *esp_dev =
4308 kmalloc(sizeof(struct esp_device), GFP_ATOMIC);
4309
4310 if (!esp_dev)
4311 return -ENOMEM;
4312 memset(esp_dev, 0, sizeof(struct esp_device));
4313 SDptr->hostdata = esp_dev;
4314 return 0;
4315}
4316
4317static void esp_slave_destroy(struct scsi_device *SDptr)
4318{
4319 struct esp *esp = (struct esp *) SDptr->host->hostdata;
4320
4321 esp->targets_present &= ~(1 << SDptr->id);
4322 kfree(SDptr->hostdata);
4323 SDptr->hostdata = NULL;
4324}
4325
4326static struct scsi_host_template esp_template = {
4327 .module = THIS_MODULE,
4328 .name = "esp",
4329 .info = esp_info,
4330 .slave_alloc = esp_slave_alloc,
4331 .slave_destroy = esp_slave_destroy,
4332 .queuecommand = esp_queue,
4333 .eh_abort_handler = esp_abort,
4334 .eh_bus_reset_handler = esp_reset,
4335 .can_queue = 7,
4336 .this_id = 7,
4337 .sg_tablesize = SG_ALL,
4338 .cmd_per_lun = 1,
4339 .use_clustering = ENABLE_CLUSTERING,
4340 .proc_name = "esp",
4341 .proc_info = esp_proc_info,
4342};
4343
4344#ifndef CONFIG_SUN4
4345static struct of_device_id esp_match[] = {
4346 {
4347 .name = "SUNW,esp",
4348 .data = &esp_template,
4349 },
4350 {
4351 .name = "SUNW,fas",
4352 .data = &esp_template,
4353 },
4354 {
4355 .name = "esp",
4356 .data = &esp_template,
4357 },
4358 {},
4359};
4360MODULE_DEVICE_TABLE(of, esp_match);
4361
4362static struct of_platform_driver esp_sbus_driver = {
4363 .name = "esp",
4364 .match_table = esp_match,
4365 .probe = esp_sbus_probe,
4366 .remove = __devexit_p(esp_sbus_remove),
4367};
4368#endif
4369
4370static int __init esp_init(void)
4371{
4372#ifdef CONFIG_SUN4
4373 return esp_sun4_probe(&esp_template);
4374#else
4375 return of_register_driver(&esp_sbus_driver, &sbus_bus_type);
4376#endif
4377}
4378
4379static void __exit esp_exit(void)
4380{
4381#ifdef CONFIG_SUN4
4382 esp_sun4_remove();
4383#else
4384 of_unregister_driver(&esp_sbus_driver);
4385#endif
4386}
4387
4388MODULE_DESCRIPTION("ESP Sun SCSI driver");
4389MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
4390MODULE_LICENSE("GPL");
4391MODULE_VERSION(DRV_VERSION);
4392
4393module_init(esp_init);
4394module_exit(esp_exit);
diff --git a/drivers/scsi/esp.h b/drivers/scsi/esp.h
deleted file mode 100644
index a98cda9121f..00000000000
--- a/drivers/scsi/esp.h
+++ /dev/null
@@ -1,406 +0,0 @@
1/* $Id: esp.h,v 1.29 2001/12/11 04:55:47 davem Exp $
2 * esp.h: Defines and structures for the Sparc ESP (Enhanced SCSI
3 * Processor) driver under Linux.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#ifndef _SPARC_ESP_H
9#define _SPARC_ESP_H
10
11/* For dvma controller register definitions. */
12#include <asm/dma.h>
13
14/* The ESP SCSI controllers have their register sets in three
15 * "classes":
16 *
17 * 1) Registers which are both read and write.
18 * 2) Registers which are read only.
19 * 3) Registers which are write only.
20 *
21 * Yet, they all live within the same IO space.
22 */
23
24/* All the ESP registers are one byte each and are accessed longwords
25 * apart with a big-endian ordering to the bytes.
26 */
27 /* Access Description Offset */
28#define ESP_TCLOW 0x00UL /* rw Low bits of the transfer count 0x00 */
29#define ESP_TCMED 0x04UL /* rw Mid bits of the transfer count 0x04 */
30#define ESP_FDATA 0x08UL /* rw FIFO data bits 0x08 */
31#define ESP_CMD 0x0cUL /* rw SCSI command bits 0x0c */
32#define ESP_STATUS 0x10UL /* ro ESP status register 0x10 */
33#define ESP_BUSID ESP_STATUS /* wo Bus ID for select/reselect 0x10 */
34#define ESP_INTRPT 0x14UL /* ro Kind of interrupt 0x14 */
35#define ESP_TIMEO ESP_INTRPT /* wo Timeout value for select/resel 0x14 */
36#define ESP_SSTEP 0x18UL /* ro Sequence step register 0x18 */
37#define ESP_STP ESP_SSTEP /* wo Transfer period per sync 0x18 */
38#define ESP_FFLAGS 0x1cUL /* ro Bits of current FIFO info 0x1c */
39#define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */
40#define ESP_CFG1 0x20UL /* rw First configuration register 0x20 */
41#define ESP_CFACT 0x24UL /* wo Clock conversion factor 0x24 */
42#define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */
43#define ESP_CTEST 0x28UL /* wo Chip test register 0x28 */
44#define ESP_CFG2 0x2cUL /* rw Second configuration register 0x2c */
45#define ESP_CFG3 0x30UL /* rw Third configuration register 0x30 */
46#define ESP_TCHI 0x38UL /* rw High bits of transfer count 0x38 */
47#define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */
48#define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */
49#define ESP_FGRND 0x3cUL /* rw Data base for fifo 0x3c */
50#define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */
51#define ESP_REG_SIZE 0x40UL
52
53/* Various revisions of the ESP board. */
54enum esp_rev {
55 esp100 = 0x00, /* NCR53C90 - very broken */
56 esp100a = 0x01, /* NCR53C90A */
57 esp236 = 0x02,
58 fas236 = 0x03,
59 fas100a = 0x04,
60 fast = 0x05,
61 fashme = 0x06,
62 espunknown = 0x07
63};
64
65/* We allocate one of these for each scsi device and attach it to
66 * SDptr->hostdata for use in the driver
67 */
68struct esp_device {
69 unsigned char sync_min_period;
70 unsigned char sync_max_offset;
71 unsigned sync:1;
72 unsigned wide:1;
73 unsigned disconnect:1;
74};
75
76struct scsi_cmnd;
77
78/* We get one of these for each ESP probed. */
79struct esp {
80 void __iomem *eregs; /* ESP controller registers */
81 void __iomem *dregs; /* DMA controller registers */
82 struct sbus_dma *dma; /* DMA controller sw state */
83 struct Scsi_Host *ehost; /* Backpointer to SCSI Host */
84 struct sbus_dev *sdev; /* Pointer to SBus entry */
85
86 /* ESP Configuration Registers */
87 u8 config1; /* Copy of the 1st config register */
88 u8 config2; /* Copy of the 2nd config register */
89 u8 config3[16]; /* Copy of the 3rd config register */
90
91 /* The current command we are sending to the ESP chip. This esp_command
92 * ptr needs to be mapped in DVMA area so we can send commands and read
93 * from the ESP fifo without burning precious CPU cycles. Programmed I/O
94 * sucks when we have the DVMA to do it for us. The ESP is stupid and will
95 * only send out 6, 10, and 12 byte SCSI commands, others we need to send
96 * one byte at a time. esp_slowcmd being set says that we are doing one
97 * of the command types ESP doesn't understand, esp_scmdp keeps track of
98 * which byte we are sending, esp_scmdleft says how many bytes to go.
99 */
100 volatile u8 *esp_command; /* Location of command (CPU view) */
101 __u32 esp_command_dvma;/* Location of command (DVMA view) */
102 unsigned char esp_clen; /* Length of this command */
103 unsigned char esp_slowcmd;
104 unsigned char *esp_scmdp;
105 unsigned char esp_scmdleft;
106
107 /* The following are used to determine the cause of an IRQ. Upon every
108 * IRQ entry we synchronize these with the hardware registers.
109 */
110 u8 ireg; /* Copy of ESP interrupt register */
111 u8 sreg; /* Copy of ESP status register */
112 u8 seqreg; /* Copy of ESP sequence step register */
113 u8 sreg2; /* Copy of HME status2 register */
114
115 /* To save register writes to the ESP, which can be expensive, we
116 * keep track of the previous value that various registers had for
117 * the last target we connected to. If they are the same for the
118 * current target, we skip the register writes as they are not needed.
119 */
120 u8 prev_soff, prev_stp;
121 u8 prev_cfg3, __cache_pad;
122
123 /* We also keep a cache of the previous FAS/HME DMA CSR register value. */
124 u32 prev_hme_dmacsr;
125
126 /* The HME is the biggest piece of shit I have ever seen. */
127 u8 hme_fifo_workaround_buffer[16 * 2];
128 u8 hme_fifo_workaround_count;
129
130 /* For each target we keep track of save/restore data
131 * pointer information. This needs to be updated majorly
132 * when we add support for tagged queueing. -DaveM
133 */
134 struct esp_pointers {
135 char *saved_ptr;
136 struct scatterlist *saved_buffer;
137 int saved_this_residual;
138 int saved_buffers_residual;
139 } data_pointers[16] /*XXX [MAX_TAGS_PER_TARGET]*/;
140
141 /* Clock periods, frequencies, synchronization, etc. */
142 unsigned int cfreq; /* Clock frequency in HZ */
143 unsigned int cfact; /* Clock conversion factor */
144 unsigned int raw_cfact; /* Raw copy from probing */
145 unsigned int ccycle; /* One ESP clock cycle */
146 unsigned int ctick; /* One ESP clock time */
147 unsigned int radelay; /* FAST chip req/ack delay */
148 unsigned int neg_defp; /* Default negotiation period */
149 unsigned int sync_defp; /* Default sync transfer period */
150 unsigned int max_period; /* longest our period can be */
151 unsigned int min_period; /* shortest period we can withstand */
152
153 struct esp *next; /* Next ESP we probed or NULL */
154 char prom_name[64]; /* Name of ESP device from prom */
155 int prom_node; /* Prom node where ESP found */
156 int esp_id; /* Unique per-ESP ID number */
157
158 /* For slow to medium speed input clock rates we shoot for 5mb/s,
159 * but for high input clock rates we try to do 10mb/s although I
160 * don't think a transfer can even run that fast with an ESP even
161 * with DMA2 scatter gather pipelining.
162 */
163#define SYNC_DEFP_SLOW 0x32 /* 5mb/s */
164#define SYNC_DEFP_FAST 0x19 /* 10mb/s */
165
166 unsigned int snip; /* Sync. negotiation in progress */
167 unsigned int wnip; /* WIDE negotiation in progress */
168 unsigned int targets_present;/* targets spoken to before */
169
170 int current_transfer_size; /* Set at beginning of data dma */
171
172 u8 espcmdlog[32]; /* Log of current esp cmds sent. */
173 u8 espcmdent; /* Current entry in esp cmd log. */
174
175 /* Misc. info about this ESP */
176 enum esp_rev erev; /* ESP revision */
177 int irq; /* SBus IRQ for this ESP */
178 int scsi_id; /* Who am I as initiator? */
179 int scsi_id_mask; /* Bitmask of 'me'. */
180 int diff; /* Differential SCSI bus? */
181 int bursts; /* Burst sizes our DVMA supports */
182
183 /* Our command queues, only one cmd lives in the current_SC queue. */
184 struct scsi_cmnd *issue_SC; /* Commands to be issued */
185 struct scsi_cmnd *current_SC; /* Who is currently working the bus */
186 struct scsi_cmnd *disconnected_SC;/* Commands disconnected from the bus */
187
188 /* Message goo */
189 u8 cur_msgout[16];
190 u8 cur_msgin[16];
191 u8 prevmsgout, prevmsgin;
192 u8 msgout_len, msgin_len;
193 u8 msgout_ctr, msgin_ctr;
194
195 /* States that we cannot keep in the per cmd structure because they
196 * cannot be assosciated with any specific command.
197 */
198 u8 resetting_bus;
199 wait_queue_head_t reset_queue;
200};
201
202/* Bitfield meanings for the above registers. */
203
204/* ESP config reg 1, read-write, found on all ESP chips */
205#define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */
206#define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */
207#define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */
208#define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */
209#define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */
210#define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */
211
212/* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */
213#define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */
214#define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */
215#define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */
216#define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tmode only) */
217#define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */
218#define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */
219#define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */
220#define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */
221#define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,esp216) */
222#define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (esp236) */
223#define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */
224#define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */
225#define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */
226
227/* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */
228#define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */
229#define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */
230#define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */
231#define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */
232#define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */
233#define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */
234#define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */
235#define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */
236#define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */
237#define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */
238#define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */
239#define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */
240#define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */
241#define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */
242#define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */
243#define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */
244
245/* ESP command register read-write */
246/* Group 1 commands: These may be sent at any point in time to the ESP
247 * chip. None of them can generate interrupts 'cept
248 * the "SCSI bus reset" command if you have not disabled
249 * SCSI reset interrupts in the config1 ESP register.
250 */
251#define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */
252#define ESP_CMD_FLUSH 0x01 /* FIFO Flush */
253#define ESP_CMD_RC 0x02 /* Chip reset */
254#define ESP_CMD_RS 0x03 /* SCSI bus reset */
255
256/* Group 2 commands: ESP must be an initiator and connected to a target
257 * for these commands to work.
258 */
259#define ESP_CMD_TI 0x10 /* Transfer Information */
260#define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */
261#define ESP_CMD_MOK 0x12 /* Message okie-dokie */
262#define ESP_CMD_TPAD 0x18 /* Transfer Pad */
263#define ESP_CMD_SATN 0x1a /* Set ATN */
264#define ESP_CMD_RATN 0x1b /* De-assert ATN */
265
266/* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected
267 * to a target as the initiator for these commands to work.
268 */
269#define ESP_CMD_SMSG 0x20 /* Send message */
270#define ESP_CMD_SSTAT 0x21 /* Send status */
271#define ESP_CMD_SDATA 0x22 /* Send data */
272#define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */
273#define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */
274#define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */
275#define ESP_CMD_DCNCT 0x27 /* Disconnect */
276#define ESP_CMD_RMSG 0x28 /* Receive Message */
277#define ESP_CMD_RCMD 0x29 /* Receive Command */
278#define ESP_CMD_RDATA 0x2a /* Receive Data */
279#define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */
280
281/* Group 4 commands: The ESP must be in the disconnected state and must
282 * not be connected to any targets as initiator for
283 * these commands to work.
284 */
285#define ESP_CMD_RSEL 0x40 /* Reselect */
286#define ESP_CMD_SEL 0x41 /* Select w/o ATN */
287#define ESP_CMD_SELA 0x42 /* Select w/ATN */
288#define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */
289#define ESP_CMD_ESEL 0x44 /* Enable selection */
290#define ESP_CMD_DSEL 0x45 /* Disable selections */
291#define ESP_CMD_SA3 0x46 /* Select w/ATN3 */
292#define ESP_CMD_RSEL3 0x47 /* Reselect3 */
293
294/* This bit enables the ESP's DMA on the SBus */
295#define ESP_CMD_DMA 0x80 /* Do DMA? */
296
297
298/* ESP status register read-only */
299#define ESP_STAT_PIO 0x01 /* IO phase bit */
300#define ESP_STAT_PCD 0x02 /* CD phase bit */
301#define ESP_STAT_PMSG 0x04 /* MSG phase bit */
302#define ESP_STAT_PMASK 0x07 /* Mask of phase bits */
303#define ESP_STAT_TDONE 0x08 /* Transfer Completed */
304#define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */
305#define ESP_STAT_PERR 0x20 /* Parity error */
306#define ESP_STAT_SPAM 0x40 /* Real bad error */
307/* This indicates the 'interrupt pending' condition on esp236, it is a reserved
308 * bit on other revs of the ESP.
309 */
310#define ESP_STAT_INTR 0x80 /* Interrupt */
311
312/* HME only: status 2 register */
313#define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */
314#define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */
315#define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */
316#define ESP_STAT2_CREGA 0x08 /* The command reg is active now */
317#define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */
318#define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */
319#define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */
320#define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */
321
322/* The status register can be masked with ESP_STAT_PMASK and compared
323 * with the following values to determine the current phase the ESP
324 * (at least thinks it) is in. For our purposes we also add our own
325 * software 'done' bit for our phase management engine.
326 */
327#define ESP_DOP (0) /* Data Out */
328#define ESP_DIP (ESP_STAT_PIO) /* Data In */
329#define ESP_CMDP (ESP_STAT_PCD) /* Command */
330#define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */
331#define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */
332#define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */
333
334/* ESP interrupt register read-only */
335#define ESP_INTR_S 0x01 /* Select w/o ATN */
336#define ESP_INTR_SATN 0x02 /* Select w/ATN */
337#define ESP_INTR_RSEL 0x04 /* Reselected */
338#define ESP_INTR_FDONE 0x08 /* Function done */
339#define ESP_INTR_BSERV 0x10 /* Bus service */
340#define ESP_INTR_DC 0x20 /* Disconnect */
341#define ESP_INTR_IC 0x40 /* Illegal command given */
342#define ESP_INTR_SR 0x80 /* SCSI bus reset detected */
343
344/* Interrupt status macros */
345#define ESP_SRESET_IRQ(esp) ((esp)->intreg & (ESP_INTR_SR))
346#define ESP_ILLCMD_IRQ(esp) ((esp)->intreg & (ESP_INTR_IC))
347#define ESP_SELECT_WITH_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_SATN))
348#define ESP_SELECT_WITHOUT_ATN_IRQ(esp) ((esp)->intreg & (ESP_INTR_S))
349#define ESP_SELECTION_IRQ(esp) ((ESP_SELECT_WITH_ATN_IRQ(esp)) || \
350 (ESP_SELECT_WITHOUT_ATN_IRQ(esp)))
351#define ESP_RESELECTION_IRQ(esp) ((esp)->intreg & (ESP_INTR_RSEL))
352
353/* ESP sequence step register read-only */
354#define ESP_STEP_VBITS 0x07 /* Valid bits */
355#define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */
356#define ESP_STEP_SID 0x01 /* One msg byte sent */
357#define ESP_STEP_NCMD 0x02 /* Was not in command phase */
358#define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd
359 * bytes to be lost
360 */
361#define ESP_STEP_FINI4 0x04 /* Command was sent ok */
362
363/* Ho hum, some ESP's set the step register to this as well... */
364#define ESP_STEP_FINI5 0x05
365#define ESP_STEP_FINI6 0x06
366#define ESP_STEP_FINI7 0x07
367
368/* ESP chip-test register read-write */
369#define ESP_TEST_TARG 0x01 /* Target test mode */
370#define ESP_TEST_INI 0x02 /* Initiator test mode */
371#define ESP_TEST_TS 0x04 /* Tristate test mode */
372
373/* ESP unique ID register read-only, found on fas236+fas100a only */
374#define ESP_UID_F100A 0x00 /* ESP FAS100A */
375#define ESP_UID_F236 0x02 /* ESP FAS236 */
376#define ESP_UID_REV 0x07 /* ESP revision */
377#define ESP_UID_FAM 0xf8 /* ESP family */
378
379/* ESP fifo flags register read-only */
380/* Note that the following implies a 16 byte FIFO on the ESP. */
381#define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */
382#define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */
383#define ESP_FF_SSTEP 0xe0 /* Sequence step */
384
385/* ESP clock conversion factor register write-only */
386#define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */
387#define ESP_CCF_NEVER 0x01 /* Set it to this and die */
388#define ESP_CCF_F2 0x02 /* 10MHz */
389#define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */
390#define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */
391#define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */
392#define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */
393#define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */
394
395/* HME only... */
396#define ESP_BUSID_RESELID 0x10
397#define ESP_BUSID_CTR32BIT 0x40
398
399#define ESP_BUS_TIMEOUT 275 /* In milli-seconds */
400#define ESP_TIMEO_CONST 8192
401#define ESP_NEG_DEFP(mhz, cfact) \
402 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
403#define ESP_MHZ_TO_CYCLE(mhertz) ((1000000000) / ((mhertz) / 1000))
404#define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000))
405
406#endif /* !(_SPARC_ESP_H) */
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
new file mode 100644
index 00000000000..3cd5bf723da
--- /dev/null
+++ b/drivers/scsi/esp_scsi.c
@@ -0,0 +1,2710 @@
1/* esp_scsi.c: ESP SCSI driver.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6#include <linux/kernel.h>
7#include <linux/types.h>
8#include <linux/slab.h>
9#include <linux/delay.h>
10#include <linux/list.h>
11#include <linux/completion.h>
12#include <linux/kallsyms.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/init.h>
16
17#include <asm/irq.h>
18#include <asm/io.h>
19#include <asm/dma.h>
20
21#include <scsi/scsi.h>
22#include <scsi/scsi_host.h>
23#include <scsi/scsi_cmnd.h>
24#include <scsi/scsi_device.h>
25#include <scsi/scsi_tcq.h>
26#include <scsi/scsi_dbg.h>
27#include <scsi/scsi_transport_spi.h>
28
29#include "esp_scsi.h"
30
31#define DRV_MODULE_NAME "esp"
32#define PFX DRV_MODULE_NAME ": "
33#define DRV_VERSION "2.000"
34#define DRV_MODULE_RELDATE "April 19, 2007"
35
36/* SCSI bus reset settle time in seconds. */
37static int esp_bus_reset_settle = 3;
38
39static u32 esp_debug;
40#define ESP_DEBUG_INTR 0x00000001
41#define ESP_DEBUG_SCSICMD 0x00000002
42#define ESP_DEBUG_RESET 0x00000004
43#define ESP_DEBUG_MSGIN 0x00000008
44#define ESP_DEBUG_MSGOUT 0x00000010
45#define ESP_DEBUG_CMDDONE 0x00000020
46#define ESP_DEBUG_DISCONNECT 0x00000040
47#define ESP_DEBUG_DATASTART 0x00000080
48#define ESP_DEBUG_DATADONE 0x00000100
49#define ESP_DEBUG_RECONNECT 0x00000200
50#define ESP_DEBUG_AUTOSENSE 0x00000400
51
52#define esp_log_intr(f, a...) \
53do { if (esp_debug & ESP_DEBUG_INTR) \
54 printk(f, ## a); \
55} while (0)
56
57#define esp_log_reset(f, a...) \
58do { if (esp_debug & ESP_DEBUG_RESET) \
59 printk(f, ## a); \
60} while (0)
61
62#define esp_log_msgin(f, a...) \
63do { if (esp_debug & ESP_DEBUG_MSGIN) \
64 printk(f, ## a); \
65} while (0)
66
67#define esp_log_msgout(f, a...) \
68do { if (esp_debug & ESP_DEBUG_MSGOUT) \
69 printk(f, ## a); \
70} while (0)
71
72#define esp_log_cmddone(f, a...) \
73do { if (esp_debug & ESP_DEBUG_CMDDONE) \
74 printk(f, ## a); \
75} while (0)
76
77#define esp_log_disconnect(f, a...) \
78do { if (esp_debug & ESP_DEBUG_DISCONNECT) \
79 printk(f, ## a); \
80} while (0)
81
82#define esp_log_datastart(f, a...) \
83do { if (esp_debug & ESP_DEBUG_DATASTART) \
84 printk(f, ## a); \
85} while (0)
86
87#define esp_log_datadone(f, a...) \
88do { if (esp_debug & ESP_DEBUG_DATADONE) \
89 printk(f, ## a); \
90} while (0)
91
92#define esp_log_reconnect(f, a...) \
93do { if (esp_debug & ESP_DEBUG_RECONNECT) \
94 printk(f, ## a); \
95} while (0)
96
97#define esp_log_autosense(f, a...) \
98do { if (esp_debug & ESP_DEBUG_AUTOSENSE) \
99 printk(f, ## a); \
100} while (0)
101
102#define esp_read8(REG) esp->ops->esp_read8(esp, REG)
103#define esp_write8(VAL,REG) esp->ops->esp_write8(esp, VAL, REG)
104
105static void esp_log_fill_regs(struct esp *esp,
106 struct esp_event_ent *p)
107{
108 p->sreg = esp->sreg;
109 p->seqreg = esp->seqreg;
110 p->sreg2 = esp->sreg2;
111 p->ireg = esp->ireg;
112 p->select_state = esp->select_state;
113 p->event = esp->event;
114}
115
116void scsi_esp_cmd(struct esp *esp, u8 val)
117{
118 struct esp_event_ent *p;
119 int idx = esp->esp_event_cur;
120
121 p = &esp->esp_event_log[idx];
122 p->type = ESP_EVENT_TYPE_CMD;
123 p->val = val;
124 esp_log_fill_regs(esp, p);
125
126 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
127
128 esp_write8(val, ESP_CMD);
129}
130EXPORT_SYMBOL(scsi_esp_cmd);
131
132static void esp_event(struct esp *esp, u8 val)
133{
134 struct esp_event_ent *p;
135 int idx = esp->esp_event_cur;
136
137 p = &esp->esp_event_log[idx];
138 p->type = ESP_EVENT_TYPE_EVENT;
139 p->val = val;
140 esp_log_fill_regs(esp, p);
141
142 esp->esp_event_cur = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
143
144 esp->event = val;
145}
146
147static void esp_dump_cmd_log(struct esp *esp)
148{
149 int idx = esp->esp_event_cur;
150 int stop = idx;
151
152 printk(KERN_INFO PFX "esp%d: Dumping command log\n",
153 esp->host->unique_id);
154 do {
155 struct esp_event_ent *p = &esp->esp_event_log[idx];
156
157 printk(KERN_INFO PFX "esp%d: ent[%d] %s ",
158 esp->host->unique_id, idx,
159 p->type == ESP_EVENT_TYPE_CMD ? "CMD" : "EVENT");
160
161 printk("val[%02x] sreg[%02x] seqreg[%02x] "
162 "sreg2[%02x] ireg[%02x] ss[%02x] event[%02x]\n",
163 p->val, p->sreg, p->seqreg,
164 p->sreg2, p->ireg, p->select_state, p->event);
165
166 idx = (idx + 1) & (ESP_EVENT_LOG_SZ - 1);
167 } while (idx != stop);
168}
169
170static void esp_flush_fifo(struct esp *esp)
171{
172 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
173 if (esp->rev == ESP236) {
174 int lim = 1000;
175
176 while (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES) {
177 if (--lim == 0) {
178 printk(KERN_ALERT PFX "esp%d: ESP_FF_BYTES "
179 "will not clear!\n",
180 esp->host->unique_id);
181 break;
182 }
183 udelay(1);
184 }
185 }
186}
187
188static void hme_read_fifo(struct esp *esp)
189{
190 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
191 int idx = 0;
192
193 while (fcnt--) {
194 esp->fifo[idx++] = esp_read8(ESP_FDATA);
195 esp->fifo[idx++] = esp_read8(ESP_FDATA);
196 }
197 if (esp->sreg2 & ESP_STAT2_F1BYTE) {
198 esp_write8(0, ESP_FDATA);
199 esp->fifo[idx++] = esp_read8(ESP_FDATA);
200 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
201 }
202 esp->fifo_cnt = idx;
203}
204
205static void esp_set_all_config3(struct esp *esp, u8 val)
206{
207 int i;
208
209 for (i = 0; i < ESP_MAX_TARGET; i++)
210 esp->target[i].esp_config3 = val;
211}
212
213/* Reset the ESP chip, _not_ the SCSI bus. */
214static void esp_reset_esp(struct esp *esp)
215{
216 u8 family_code, version;
217
218 /* Now reset the ESP chip */
219 scsi_esp_cmd(esp, ESP_CMD_RC);
220 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
221 scsi_esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
222
223 /* Reload the configuration registers */
224 esp_write8(esp->cfact, ESP_CFACT);
225
226 esp->prev_stp = 0;
227 esp_write8(esp->prev_stp, ESP_STP);
228
229 esp->prev_soff = 0;
230 esp_write8(esp->prev_soff, ESP_SOFF);
231
232 esp_write8(esp->neg_defp, ESP_TIMEO);
233
234 /* This is the only point at which it is reliable to read
235 * the ID-code for a fast ESP chip variants.
236 */
237 esp->max_period = ((35 * esp->ccycle) / 1000);
238 if (esp->rev == FAST) {
239 version = esp_read8(ESP_UID);
240 family_code = (version & 0xf8) >> 3;
241 if (family_code == 0x02)
242 esp->rev = FAS236;
243 else if (family_code == 0x0a)
244 esp->rev = FASHME; /* Version is usually '5'. */
245 else
246 esp->rev = FAS100A;
247 esp->min_period = ((4 * esp->ccycle) / 1000);
248 } else {
249 esp->min_period = ((5 * esp->ccycle) / 1000);
250 }
251 esp->max_period = (esp->max_period + 3)>>2;
252 esp->min_period = (esp->min_period + 3)>>2;
253
254 esp_write8(esp->config1, ESP_CFG1);
255 switch (esp->rev) {
256 case ESP100:
257 /* nothing to do */
258 break;
259
260 case ESP100A:
261 esp_write8(esp->config2, ESP_CFG2);
262 break;
263
264 case ESP236:
265 /* Slow 236 */
266 esp_write8(esp->config2, ESP_CFG2);
267 esp->prev_cfg3 = esp->target[0].esp_config3;
268 esp_write8(esp->prev_cfg3, ESP_CFG3);
269 break;
270
271 case FASHME:
272 esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
273 /* fallthrough... */
274
275 case FAS236:
276 /* Fast 236 or HME */
277 esp_write8(esp->config2, ESP_CFG2);
278 if (esp->rev == FASHME) {
279 u8 cfg3 = esp->target[0].esp_config3;
280
281 cfg3 |= ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH;
282 if (esp->scsi_id >= 8)
283 cfg3 |= ESP_CONFIG3_IDBIT3;
284 esp_set_all_config3(esp, cfg3);
285 } else {
286 u32 cfg3 = esp->target[0].esp_config3;
287
288 cfg3 |= ESP_CONFIG3_FCLK;
289 esp_set_all_config3(esp, cfg3);
290 }
291 esp->prev_cfg3 = esp->target[0].esp_config3;
292 esp_write8(esp->prev_cfg3, ESP_CFG3);
293 if (esp->rev == FASHME) {
294 esp->radelay = 80;
295 } else {
296 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
297 esp->radelay = 0;
298 else
299 esp->radelay = 96;
300 }
301 break;
302
303 case FAS100A:
304 /* Fast 100a */
305 esp_write8(esp->config2, ESP_CFG2);
306 esp_set_all_config3(esp,
307 (esp->target[0].esp_config3 |
308 ESP_CONFIG3_FCLOCK));
309 esp->prev_cfg3 = esp->target[0].esp_config3;
310 esp_write8(esp->prev_cfg3, ESP_CFG3);
311 esp->radelay = 32;
312 break;
313
314 default:
315 break;
316 }
317
318 /* Eat any bitrot in the chip */
319 esp_read8(ESP_INTRPT);
320 udelay(100);
321}
322
323static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
324{
325 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
326 struct scatterlist *sg = cmd->request_buffer;
327 int dir = cmd->sc_data_direction;
328 int total, i;
329
330 if (dir == DMA_NONE)
331 return;
332
333 BUG_ON(cmd->use_sg == 0);
334
335 spriv->u.num_sg = esp->ops->map_sg(esp, sg,
336 cmd->use_sg, dir);
337 spriv->cur_residue = sg_dma_len(sg);
338 spriv->cur_sg = sg;
339
340 total = 0;
341 for (i = 0; i < spriv->u.num_sg; i++)
342 total += sg_dma_len(&sg[i]);
343 spriv->tot_residue = total;
344}
345
346static dma_addr_t esp_cur_dma_addr(struct esp_cmd_entry *ent,
347 struct scsi_cmnd *cmd)
348{
349 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
350
351 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
352 return ent->sense_dma +
353 (ent->sense_ptr - cmd->sense_buffer);
354 }
355
356 return sg_dma_address(p->cur_sg) +
357 (sg_dma_len(p->cur_sg) -
358 p->cur_residue);
359}
360
361static unsigned int esp_cur_dma_len(struct esp_cmd_entry *ent,
362 struct scsi_cmnd *cmd)
363{
364 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
365
366 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
367 return SCSI_SENSE_BUFFERSIZE -
368 (ent->sense_ptr - cmd->sense_buffer);
369 }
370 return p->cur_residue;
371}
372
373static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent,
374 struct scsi_cmnd *cmd, unsigned int len)
375{
376 struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
377
378 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
379 ent->sense_ptr += len;
380 return;
381 }
382
383 p->cur_residue -= len;
384 p->tot_residue -= len;
385 if (p->cur_residue < 0 || p->tot_residue < 0) {
386 printk(KERN_ERR PFX "esp%d: Data transfer overflow.\n",
387 esp->host->unique_id);
388 printk(KERN_ERR PFX "esp%d: cur_residue[%d] tot_residue[%d] "
389 "len[%u]\n",
390 esp->host->unique_id,
391 p->cur_residue, p->tot_residue, len);
392 p->cur_residue = 0;
393 p->tot_residue = 0;
394 }
395 if (!p->cur_residue && p->tot_residue) {
396 p->cur_sg++;
397 p->cur_residue = sg_dma_len(p->cur_sg);
398 }
399}
400
401static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd)
402{
403 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
404 int dir = cmd->sc_data_direction;
405
406 if (dir == DMA_NONE)
407 return;
408
409 esp->ops->unmap_sg(esp, cmd->request_buffer,
410 spriv->u.num_sg, dir);
411}
412
413static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent)
414{
415 struct scsi_cmnd *cmd = ent->cmd;
416 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
417
418 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
419 ent->saved_sense_ptr = ent->sense_ptr;
420 return;
421 }
422 ent->saved_cur_residue = spriv->cur_residue;
423 ent->saved_cur_sg = spriv->cur_sg;
424 ent->saved_tot_residue = spriv->tot_residue;
425}
426
427static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent)
428{
429 struct scsi_cmnd *cmd = ent->cmd;
430 struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
431
432 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
433 ent->sense_ptr = ent->saved_sense_ptr;
434 return;
435 }
436 spriv->cur_residue = ent->saved_cur_residue;
437 spriv->cur_sg = ent->saved_cur_sg;
438 spriv->tot_residue = ent->saved_tot_residue;
439}
440
441static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd)
442{
443 if (cmd->cmd_len == 6 ||
444 cmd->cmd_len == 10 ||
445 cmd->cmd_len == 12) {
446 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
447 } else {
448 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
449 }
450}
451
452static void esp_write_tgt_config3(struct esp *esp, int tgt)
453{
454 if (esp->rev > ESP100A) {
455 u8 val = esp->target[tgt].esp_config3;
456
457 if (val != esp->prev_cfg3) {
458 esp->prev_cfg3 = val;
459 esp_write8(val, ESP_CFG3);
460 }
461 }
462}
463
464static void esp_write_tgt_sync(struct esp *esp, int tgt)
465{
466 u8 off = esp->target[tgt].esp_offset;
467 u8 per = esp->target[tgt].esp_period;
468
469 if (off != esp->prev_soff) {
470 esp->prev_soff = off;
471 esp_write8(off, ESP_SOFF);
472 }
473 if (per != esp->prev_stp) {
474 esp->prev_stp = per;
475 esp_write8(per, ESP_STP);
476 }
477}
478
479static u32 esp_dma_length_limit(struct esp *esp, u32 dma_addr, u32 dma_len)
480{
481 if (esp->rev == FASHME) {
482 /* Arbitrary segment boundaries, 24-bit counts. */
483 if (dma_len > (1U << 24))
484 dma_len = (1U << 24);
485 } else {
486 u32 base, end;
487
488 /* ESP chip limits other variants by 16-bits of transfer
489 * count. Actually on FAS100A and FAS236 we could get
490 * 24-bits of transfer count by enabling ESP_CONFIG2_FENAB
491 * in the ESP_CFG2 register but that causes other unwanted
492 * changes so we don't use it currently.
493 */
494 if (dma_len > (1U << 16))
495 dma_len = (1U << 16);
496
497 /* All of the DMA variants hooked up to these chips
498 * cannot handle crossing a 24-bit address boundary.
499 */
500 base = dma_addr & ((1U << 24) - 1U);
501 end = base + dma_len;
502 if (end > (1U << 24))
503 end = (1U <<24);
504 dma_len = end - base;
505 }
506 return dma_len;
507}
508
509static int esp_need_to_nego_wide(struct esp_target_data *tp)
510{
511 struct scsi_target *target = tp->starget;
512
513 return spi_width(target) != tp->nego_goal_width;
514}
515
516static int esp_need_to_nego_sync(struct esp_target_data *tp)
517{
518 struct scsi_target *target = tp->starget;
519
520 /* When offset is zero, period is "don't care". */
521 if (!spi_offset(target) && !tp->nego_goal_offset)
522 return 0;
523
524 if (spi_offset(target) == tp->nego_goal_offset &&
525 spi_period(target) == tp->nego_goal_period)
526 return 0;
527
528 return 1;
529}
530
531static int esp_alloc_lun_tag(struct esp_cmd_entry *ent,
532 struct esp_lun_data *lp)
533{
534 if (!ent->tag[0]) {
535 /* Non-tagged, slot already taken? */
536 if (lp->non_tagged_cmd)
537 return -EBUSY;
538
539 if (lp->hold) {
540 /* We are being held by active tagged
541 * commands.
542 */
543 if (lp->num_tagged)
544 return -EBUSY;
545
546 /* Tagged commands completed, we can unplug
547 * the queue and run this untagged command.
548 */
549 lp->hold = 0;
550 } else if (lp->num_tagged) {
551 /* Plug the queue until num_tagged decreases
552 * to zero in esp_free_lun_tag.
553 */
554 lp->hold = 1;
555 return -EBUSY;
556 }
557
558 lp->non_tagged_cmd = ent;
559 return 0;
560 } else {
561 /* Tagged command, see if blocked by a
562 * non-tagged one.
563 */
564 if (lp->non_tagged_cmd || lp->hold)
565 return -EBUSY;
566 }
567
568 BUG_ON(lp->tagged_cmds[ent->tag[1]]);
569
570 lp->tagged_cmds[ent->tag[1]] = ent;
571 lp->num_tagged++;
572
573 return 0;
574}
575
576static void esp_free_lun_tag(struct esp_cmd_entry *ent,
577 struct esp_lun_data *lp)
578{
579 if (ent->tag[0]) {
580 BUG_ON(lp->tagged_cmds[ent->tag[1]] != ent);
581 lp->tagged_cmds[ent->tag[1]] = NULL;
582 lp->num_tagged--;
583 } else {
584 BUG_ON(lp->non_tagged_cmd != ent);
585 lp->non_tagged_cmd = NULL;
586 }
587}
588
589/* When a contingent allegiance conditon is created, we force feed a
590 * REQUEST_SENSE command to the device to fetch the sense data. I
591 * tried many other schemes, relying on the scsi error handling layer
592 * to send out the REQUEST_SENSE automatically, but this was difficult
593 * to get right especially in the presence of applications like smartd
594 * which use SG_IO to send out their own REQUEST_SENSE commands.
595 */
596static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent)
597{
598 struct scsi_cmnd *cmd = ent->cmd;
599 struct scsi_device *dev = cmd->device;
600 int tgt, lun;
601 u8 *p, val;
602
603 tgt = dev->id;
604 lun = dev->lun;
605
606
607 if (!ent->sense_ptr) {
608 esp_log_autosense("esp%d: Doing auto-sense for "
609 "tgt[%d] lun[%d]\n",
610 esp->host->unique_id, tgt, lun);
611
612 ent->sense_ptr = cmd->sense_buffer;
613 ent->sense_dma = esp->ops->map_single(esp,
614 ent->sense_ptr,
615 SCSI_SENSE_BUFFERSIZE,
616 DMA_FROM_DEVICE);
617 }
618 ent->saved_sense_ptr = ent->sense_ptr;
619
620 esp->active_cmd = ent;
621
622 p = esp->command_block;
623 esp->msg_out_len = 0;
624
625 *p++ = IDENTIFY(0, lun);
626 *p++ = REQUEST_SENSE;
627 *p++ = ((dev->scsi_level <= SCSI_2) ?
628 (lun << 5) : 0);
629 *p++ = 0;
630 *p++ = 0;
631 *p++ = SCSI_SENSE_BUFFERSIZE;
632 *p++ = 0;
633
634 esp->select_state = ESP_SELECT_BASIC;
635
636 val = tgt;
637 if (esp->rev == FASHME)
638 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
639 esp_write8(val, ESP_BUSID);
640
641 esp_write_tgt_sync(esp, tgt);
642 esp_write_tgt_config3(esp, tgt);
643
644 val = (p - esp->command_block);
645
646 if (esp->rev == FASHME)
647 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
648 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
649 val, 16, 0, ESP_CMD_DMA | ESP_CMD_SELA);
650}
651
652static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp)
653{
654 struct esp_cmd_entry *ent;
655
656 list_for_each_entry(ent, &esp->queued_cmds, list) {
657 struct scsi_cmnd *cmd = ent->cmd;
658 struct scsi_device *dev = cmd->device;
659 struct esp_lun_data *lp = dev->hostdata;
660
661 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
662 ent->tag[0] = 0;
663 ent->tag[1] = 0;
664 return ent;
665 }
666
667 if (!scsi_populate_tag_msg(cmd, &ent->tag[0])) {
668 ent->tag[0] = 0;
669 ent->tag[1] = 0;
670 }
671
672 if (esp_alloc_lun_tag(ent, lp) < 0)
673 continue;
674
675 return ent;
676 }
677
678 return NULL;
679}
680
681static void esp_maybe_execute_command(struct esp *esp)
682{
683 struct esp_target_data *tp;
684 struct esp_lun_data *lp;
685 struct scsi_device *dev;
686 struct scsi_cmnd *cmd;
687 struct esp_cmd_entry *ent;
688 int tgt, lun, i;
689 u32 val, start_cmd;
690 u8 *p;
691
692 if (esp->active_cmd ||
693 (esp->flags & ESP_FLAG_RESETTING))
694 return;
695
696 ent = find_and_prep_issuable_command(esp);
697 if (!ent)
698 return;
699
700 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
701 esp_autosense(esp, ent);
702 return;
703 }
704
705 cmd = ent->cmd;
706 dev = cmd->device;
707 tgt = dev->id;
708 lun = dev->lun;
709 tp = &esp->target[tgt];
710 lp = dev->hostdata;
711
712 list_del(&ent->list);
713 list_add(&ent->list, &esp->active_cmds);
714
715 esp->active_cmd = ent;
716
717 esp_map_dma(esp, cmd);
718 esp_save_pointers(esp, ent);
719
720 esp_check_command_len(esp, cmd);
721
722 p = esp->command_block;
723
724 esp->msg_out_len = 0;
725 if (tp->flags & ESP_TGT_CHECK_NEGO) {
726 /* Need to negotiate. If the target is broken
727 * go for synchronous transfers and non-wide.
728 */
729 if (tp->flags & ESP_TGT_BROKEN) {
730 tp->flags &= ~ESP_TGT_DISCONNECT;
731 tp->nego_goal_period = 0;
732 tp->nego_goal_offset = 0;
733 tp->nego_goal_width = 0;
734 tp->nego_goal_tags = 0;
735 }
736
737 /* If the settings are not changing, skip this. */
738 if (spi_width(tp->starget) == tp->nego_goal_width &&
739 spi_period(tp->starget) == tp->nego_goal_period &&
740 spi_offset(tp->starget) == tp->nego_goal_offset) {
741 tp->flags &= ~ESP_TGT_CHECK_NEGO;
742 goto build_identify;
743 }
744
745 if (esp->rev == FASHME && esp_need_to_nego_wide(tp)) {
746 esp->msg_out_len =
747 spi_populate_width_msg(&esp->msg_out[0],
748 (tp->nego_goal_width ?
749 1 : 0));
750 tp->flags |= ESP_TGT_NEGO_WIDE;
751 } else if (esp_need_to_nego_sync(tp)) {
752 esp->msg_out_len =
753 spi_populate_sync_msg(&esp->msg_out[0],
754 tp->nego_goal_period,
755 tp->nego_goal_offset);
756 tp->flags |= ESP_TGT_NEGO_SYNC;
757 } else {
758 tp->flags &= ~ESP_TGT_CHECK_NEGO;
759 }
760
761 /* Process it like a slow command. */
762 if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
763 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
764 }
765
766build_identify:
767 /* If we don't have a lun-data struct yet, we're probing
768 * so do not disconnect. Also, do not disconnect unless
769 * we have a tag on this command.
770 */
771 if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
772 *p++ = IDENTIFY(1, lun);
773 else
774 *p++ = IDENTIFY(0, lun);
775
776 if (ent->tag[0] && esp->rev == ESP100) {
777 /* ESP100 lacks select w/atn3 command, use select
778 * and stop instead.
779 */
780 esp->flags |= ESP_FLAG_DOING_SLOWCMD;
781 }
782
783 if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
784 start_cmd = ESP_CMD_DMA | ESP_CMD_SELA;
785 if (ent->tag[0]) {
786 *p++ = ent->tag[0];
787 *p++ = ent->tag[1];
788
789 start_cmd = ESP_CMD_DMA | ESP_CMD_SA3;
790 }
791
792 for (i = 0; i < cmd->cmd_len; i++)
793 *p++ = cmd->cmnd[i];
794
795 esp->select_state = ESP_SELECT_BASIC;
796 } else {
797 esp->cmd_bytes_left = cmd->cmd_len;
798 esp->cmd_bytes_ptr = &cmd->cmnd[0];
799
800 if (ent->tag[0]) {
801 for (i = esp->msg_out_len - 1;
802 i >= 0; i--)
803 esp->msg_out[i + 2] = esp->msg_out[i];
804 esp->msg_out[0] = ent->tag[0];
805 esp->msg_out[1] = ent->tag[1];
806 esp->msg_out_len += 2;
807 }
808
809 start_cmd = ESP_CMD_DMA | ESP_CMD_SELAS;
810 esp->select_state = ESP_SELECT_MSGOUT;
811 }
812 val = tgt;
813 if (esp->rev == FASHME)
814 val |= ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT;
815 esp_write8(val, ESP_BUSID);
816
817 esp_write_tgt_sync(esp, tgt);
818 esp_write_tgt_config3(esp, tgt);
819
820 val = (p - esp->command_block);
821
822 if (esp_debug & ESP_DEBUG_SCSICMD) {
823 printk("ESP: tgt[%d] lun[%d] scsi_cmd [ ", tgt, lun);
824 for (i = 0; i < cmd->cmd_len; i++)
825 printk("%02x ", cmd->cmnd[i]);
826 printk("]\n");
827 }
828
829 if (esp->rev == FASHME)
830 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
831 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
832 val, 16, 0, start_cmd);
833}
834
835static struct esp_cmd_entry *esp_get_ent(struct esp *esp)
836{
837 struct list_head *head = &esp->esp_cmd_pool;
838 struct esp_cmd_entry *ret;
839
840 if (list_empty(head)) {
841 ret = kzalloc(sizeof(struct esp_cmd_entry), GFP_ATOMIC);
842 } else {
843 ret = list_entry(head->next, struct esp_cmd_entry, list);
844 list_del(&ret->list);
845 memset(ret, 0, sizeof(*ret));
846 }
847 return ret;
848}
849
850static void esp_put_ent(struct esp *esp, struct esp_cmd_entry *ent)
851{
852 list_add(&ent->list, &esp->esp_cmd_pool);
853}
854
855static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
856 struct scsi_cmnd *cmd, unsigned int result)
857{
858 struct scsi_device *dev = cmd->device;
859 int tgt = dev->id;
860 int lun = dev->lun;
861
862 esp->active_cmd = NULL;
863 esp_unmap_dma(esp, cmd);
864 esp_free_lun_tag(ent, dev->hostdata);
865 cmd->result = result;
866
867 if (ent->eh_done) {
868 complete(ent->eh_done);
869 ent->eh_done = NULL;
870 }
871
872 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
873 esp->ops->unmap_single(esp, ent->sense_dma,
874 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
875 ent->sense_ptr = NULL;
876
877 /* Restore the message/status bytes to what we actually
878 * saw originally. Also, report that we are providing
879 * the sense data.
880 */
881 cmd->result = ((DRIVER_SENSE << 24) |
882 (DID_OK << 16) |
883 (COMMAND_COMPLETE << 8) |
884 (SAM_STAT_CHECK_CONDITION << 0));
885
886 ent->flags &= ~ESP_CMD_FLAG_AUTOSENSE;
887 if (esp_debug & ESP_DEBUG_AUTOSENSE) {
888 int i;
889
890 printk("esp%d: tgt[%d] lun[%d] AUTO SENSE[ ",
891 esp->host->unique_id, tgt, lun);
892 for (i = 0; i < 18; i++)
893 printk("%02x ", cmd->sense_buffer[i]);
894 printk("]\n");
895 }
896 }
897
898 cmd->scsi_done(cmd);
899
900 list_del(&ent->list);
901 esp_put_ent(esp, ent);
902
903 esp_maybe_execute_command(esp);
904}
905
906static unsigned int compose_result(unsigned int status, unsigned int message,
907 unsigned int driver_code)
908{
909 return (status | (message << 8) | (driver_code << 16));
910}
911
912static void esp_event_queue_full(struct esp *esp, struct esp_cmd_entry *ent)
913{
914 struct scsi_device *dev = ent->cmd->device;
915 struct esp_lun_data *lp = dev->hostdata;
916
917 scsi_track_queue_full(dev, lp->num_tagged - 1);
918}
919
920static int esp_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
921{
922 struct scsi_device *dev = cmd->device;
923 struct esp *esp = host_to_esp(dev->host);
924 struct esp_cmd_priv *spriv;
925 struct esp_cmd_entry *ent;
926
927 ent = esp_get_ent(esp);
928 if (!ent)
929 return SCSI_MLQUEUE_HOST_BUSY;
930
931 ent->cmd = cmd;
932
933 cmd->scsi_done = done;
934
935 spriv = ESP_CMD_PRIV(cmd);
936 spriv->u.dma_addr = ~(dma_addr_t)0x0;
937
938 list_add_tail(&ent->list, &esp->queued_cmds);
939
940 esp_maybe_execute_command(esp);
941
942 return 0;
943}
944
945static int esp_check_gross_error(struct esp *esp)
946{
947 if (esp->sreg & ESP_STAT_SPAM) {
948 /* Gross Error, could be one of:
949 * - top of fifo overwritten
950 * - top of command register overwritten
951 * - DMA programmed with wrong direction
952 * - improper phase change
953 */
954 printk(KERN_ERR PFX "esp%d: Gross error sreg[%02x]\n",
955 esp->host->unique_id, esp->sreg);
956 /* XXX Reset the chip. XXX */
957 return 1;
958 }
959 return 0;
960}
961
962static int esp_check_spur_intr(struct esp *esp)
963{
964 switch (esp->rev) {
965 case ESP100:
966 case ESP100A:
967 /* The interrupt pending bit of the status register cannot
968 * be trusted on these revisions.
969 */
970 esp->sreg &= ~ESP_STAT_INTR;
971 break;
972
973 default:
974 if (!(esp->sreg & ESP_STAT_INTR)) {
975 esp->ireg = esp_read8(ESP_INTRPT);
976 if (esp->ireg & ESP_INTR_SR)
977 return 1;
978
979 /* If the DMA is indicating interrupt pending and the
980 * ESP is not, the only possibility is a DMA error.
981 */
982 if (!esp->ops->dma_error(esp)) {
983 printk(KERN_ERR PFX "esp%d: Spurious irq, "
984 "sreg=%x.\n",
985 esp->host->unique_id, esp->sreg);
986 return -1;
987 }
988
989 printk(KERN_ERR PFX "esp%d: DMA error\n",
990 esp->host->unique_id);
991
992 /* XXX Reset the chip. XXX */
993 return -1;
994 }
995 break;
996 }
997
998 return 0;
999}
1000
1001static void esp_schedule_reset(struct esp *esp)
1002{
1003 esp_log_reset("ESP: esp_schedule_reset() from %p\n",
1004 __builtin_return_address(0));
1005 esp->flags |= ESP_FLAG_RESETTING;
1006 esp_event(esp, ESP_EVENT_RESET);
1007}
1008
1009/* In order to avoid having to add a special half-reconnected state
1010 * into the driver we just sit here and poll through the rest of
1011 * the reselection process to get the tag message bytes.
1012 */
1013static struct esp_cmd_entry *esp_reconnect_with_tag(struct esp *esp,
1014 struct esp_lun_data *lp)
1015{
1016 struct esp_cmd_entry *ent;
1017 int i;
1018
1019 if (!lp->num_tagged) {
1020 printk(KERN_ERR PFX "esp%d: Reconnect w/num_tagged==0\n",
1021 esp->host->unique_id);
1022 return NULL;
1023 }
1024
1025 esp_log_reconnect("ESP: reconnect tag, ");
1026
1027 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
1028 if (esp->ops->irq_pending(esp))
1029 break;
1030 }
1031 if (i == ESP_QUICKIRQ_LIMIT) {
1032 printk(KERN_ERR PFX "esp%d: Reconnect IRQ1 timeout\n",
1033 esp->host->unique_id);
1034 return NULL;
1035 }
1036
1037 esp->sreg = esp_read8(ESP_STATUS);
1038 esp->ireg = esp_read8(ESP_INTRPT);
1039
1040 esp_log_reconnect("IRQ(%d:%x:%x), ",
1041 i, esp->ireg, esp->sreg);
1042
1043 if (esp->ireg & ESP_INTR_DC) {
1044 printk(KERN_ERR PFX "esp%d: Reconnect, got disconnect.\n",
1045 esp->host->unique_id);
1046 return NULL;
1047 }
1048
1049 if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) {
1050 printk(KERN_ERR PFX "esp%d: Reconnect, not MIP sreg[%02x].\n",
1051 esp->host->unique_id, esp->sreg);
1052 return NULL;
1053 }
1054
1055 /* DMA in the tag bytes... */
1056 esp->command_block[0] = 0xff;
1057 esp->command_block[1] = 0xff;
1058 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1059 2, 2, 1, ESP_CMD_DMA | ESP_CMD_TI);
1060
1061 /* ACK the msssage. */
1062 scsi_esp_cmd(esp, ESP_CMD_MOK);
1063
1064 for (i = 0; i < ESP_RESELECT_TAG_LIMIT; i++) {
1065 if (esp->ops->irq_pending(esp)) {
1066 esp->sreg = esp_read8(ESP_STATUS);
1067 esp->ireg = esp_read8(ESP_INTRPT);
1068 if (esp->ireg & ESP_INTR_FDONE)
1069 break;
1070 }
1071 udelay(1);
1072 }
1073 if (i == ESP_RESELECT_TAG_LIMIT) {
1074 printk(KERN_ERR PFX "esp%d: Reconnect IRQ2 timeout\n",
1075 esp->host->unique_id);
1076 return NULL;
1077 }
1078 esp->ops->dma_drain(esp);
1079 esp->ops->dma_invalidate(esp);
1080
1081 esp_log_reconnect("IRQ2(%d:%x:%x) tag[%x:%x]\n",
1082 i, esp->ireg, esp->sreg,
1083 esp->command_block[0],
1084 esp->command_block[1]);
1085
1086 if (esp->command_block[0] < SIMPLE_QUEUE_TAG ||
1087 esp->command_block[0] > ORDERED_QUEUE_TAG) {
1088 printk(KERN_ERR PFX "esp%d: Reconnect, bad tag "
1089 "type %02x.\n",
1090 esp->host->unique_id, esp->command_block[0]);
1091 return NULL;
1092 }
1093
1094 ent = lp->tagged_cmds[esp->command_block[1]];
1095 if (!ent) {
1096 printk(KERN_ERR PFX "esp%d: Reconnect, no entry for "
1097 "tag %02x.\n",
1098 esp->host->unique_id, esp->command_block[1]);
1099 return NULL;
1100 }
1101
1102 return ent;
1103}
1104
1105static int esp_reconnect(struct esp *esp)
1106{
1107 struct esp_cmd_entry *ent;
1108 struct esp_target_data *tp;
1109 struct esp_lun_data *lp;
1110 struct scsi_device *dev;
1111 int target, lun;
1112
1113 BUG_ON(esp->active_cmd);
1114 if (esp->rev == FASHME) {
1115 /* FASHME puts the target and lun numbers directly
1116 * into the fifo.
1117 */
1118 target = esp->fifo[0];
1119 lun = esp->fifo[1] & 0x7;
1120 } else {
1121 u8 bits = esp_read8(ESP_FDATA);
1122
1123 /* Older chips put the lun directly into the fifo, but
1124 * the target is given as a sample of the arbitration
1125 * lines on the bus at reselection time. So we should
1126 * see the ID of the ESP and the one reconnecting target
1127 * set in the bitmap.
1128 */
1129 if (!(bits & esp->scsi_id_mask))
1130 goto do_reset;
1131 bits &= ~esp->scsi_id_mask;
1132 if (!bits || (bits & (bits - 1)))
1133 goto do_reset;
1134
1135 target = ffs(bits) - 1;
1136 lun = (esp_read8(ESP_FDATA) & 0x7);
1137
1138 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1139 if (esp->rev == ESP100) {
1140 u8 ireg = esp_read8(ESP_INTRPT);
1141 /* This chip has a bug during reselection that can
1142 * cause a spurious illegal-command interrupt, which
1143 * we simply ACK here. Another possibility is a bus
1144 * reset so we must check for that.
1145 */
1146 if (ireg & ESP_INTR_SR)
1147 goto do_reset;
1148 }
1149 scsi_esp_cmd(esp, ESP_CMD_NULL);
1150 }
1151
1152 esp_write_tgt_sync(esp, target);
1153 esp_write_tgt_config3(esp, target);
1154
1155 scsi_esp_cmd(esp, ESP_CMD_MOK);
1156
1157 if (esp->rev == FASHME)
1158 esp_write8(target | ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT,
1159 ESP_BUSID);
1160
1161 tp = &esp->target[target];
1162 dev = __scsi_device_lookup_by_target(tp->starget, lun);
1163 if (!dev) {
1164 printk(KERN_ERR PFX "esp%d: Reconnect, no lp "
1165 "tgt[%u] lun[%u]\n",
1166 esp->host->unique_id, target, lun);
1167 goto do_reset;
1168 }
1169 lp = dev->hostdata;
1170
1171 ent = lp->non_tagged_cmd;
1172 if (!ent) {
1173 ent = esp_reconnect_with_tag(esp, lp);
1174 if (!ent)
1175 goto do_reset;
1176 }
1177
1178 esp->active_cmd = ent;
1179
1180 if (ent->flags & ESP_CMD_FLAG_ABORT) {
1181 esp->msg_out[0] = ABORT_TASK_SET;
1182 esp->msg_out_len = 1;
1183 scsi_esp_cmd(esp, ESP_CMD_SATN);
1184 }
1185
1186 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1187 esp_restore_pointers(esp, ent);
1188 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1189 return 1;
1190
1191do_reset:
1192 esp_schedule_reset(esp);
1193 return 0;
1194}
1195
1196static int esp_finish_select(struct esp *esp)
1197{
1198 struct esp_cmd_entry *ent;
1199 struct scsi_cmnd *cmd;
1200 u8 orig_select_state;
1201
1202 orig_select_state = esp->select_state;
1203
1204 /* No longer selecting. */
1205 esp->select_state = ESP_SELECT_NONE;
1206
1207 esp->seqreg = esp_read8(ESP_SSTEP) & ESP_STEP_VBITS;
1208 ent = esp->active_cmd;
1209 cmd = ent->cmd;
1210
1211 if (esp->ops->dma_error(esp)) {
1212 /* If we see a DMA error during or as a result of selection,
1213 * all bets are off.
1214 */
1215 esp_schedule_reset(esp);
1216 esp_cmd_is_done(esp, ent, cmd, (DID_ERROR << 16));
1217 return 0;
1218 }
1219
1220 esp->ops->dma_invalidate(esp);
1221
1222 if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
1223 struct esp_target_data *tp = &esp->target[cmd->device->id];
1224
1225 /* Carefully back out of the selection attempt. Release
1226 * resources (such as DMA mapping & TAG) and reset state (such
1227 * as message out and command delivery variables).
1228 */
1229 if (!(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1230 esp_unmap_dma(esp, cmd);
1231 esp_free_lun_tag(ent, cmd->device->hostdata);
1232 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
1233 esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
1234 esp->cmd_bytes_ptr = NULL;
1235 esp->cmd_bytes_left = 0;
1236 } else {
1237 esp->ops->unmap_single(esp, ent->sense_dma,
1238 SCSI_SENSE_BUFFERSIZE,
1239 DMA_FROM_DEVICE);
1240 ent->sense_ptr = NULL;
1241 }
1242
1243 /* Now that the state is unwound properly, put back onto
1244 * the issue queue. This command is no longer active.
1245 */
1246 list_del(&ent->list);
1247 list_add(&ent->list, &esp->queued_cmds);
1248 esp->active_cmd = NULL;
1249
1250 /* Return value ignored by caller, it directly invokes
1251 * esp_reconnect().
1252 */
1253 return 0;
1254 }
1255
1256 if (esp->ireg == ESP_INTR_DC) {
1257 struct scsi_device *dev = cmd->device;
1258
1259 /* Disconnect. Make sure we re-negotiate sync and
1260 * wide parameters if this target starts responding
1261 * again in the future.
1262 */
1263 esp->target[dev->id].flags |= ESP_TGT_CHECK_NEGO;
1264
1265 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1266 esp_cmd_is_done(esp, ent, cmd, (DID_BAD_TARGET << 16));
1267 return 1;
1268 }
1269
1270 if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
1271 /* Selection successful. On pre-FAST chips we have
1272 * to do a NOP and possibly clean out the FIFO.
1273 */
1274 if (esp->rev <= ESP236) {
1275 int fcnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1276
1277 scsi_esp_cmd(esp, ESP_CMD_NULL);
1278
1279 if (!fcnt &&
1280 (!esp->prev_soff ||
1281 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
1282 esp_flush_fifo(esp);
1283 }
1284
1285 /* If we are doing a slow command, negotiation, etc.
1286 * we'll do the right thing as we transition to the
1287 * next phase.
1288 */
1289 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1290 return 0;
1291 }
1292
1293 printk("ESP: Unexpected selection completion ireg[%x].\n",
1294 esp->ireg);
1295 esp_schedule_reset(esp);
1296 return 0;
1297}
1298
1299static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
1300 struct scsi_cmnd *cmd)
1301{
1302 int fifo_cnt, ecount, bytes_sent, flush_fifo;
1303
1304 fifo_cnt = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
1305 if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
1306 fifo_cnt <<= 1;
1307
1308 ecount = 0;
1309 if (!(esp->sreg & ESP_STAT_TCNT)) {
1310 ecount = ((unsigned int)esp_read8(ESP_TCLOW) |
1311 (((unsigned int)esp_read8(ESP_TCMED)) << 8));
1312 if (esp->rev == FASHME)
1313 ecount |= ((unsigned int)esp_read8(FAS_RLO)) << 16;
1314 }
1315
1316 bytes_sent = esp->data_dma_len;
1317 bytes_sent -= ecount;
1318
1319 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1320 bytes_sent -= fifo_cnt;
1321
1322 flush_fifo = 0;
1323 if (!esp->prev_soff) {
1324 /* Synchronous data transfer, always flush fifo. */
1325 flush_fifo = 1;
1326 } else {
1327 if (esp->rev == ESP100) {
1328 u32 fflags, phase;
1329
1330 /* ESP100 has a chip bug where in the synchronous data
1331 * phase it can mistake a final long REQ pulse from the
1332 * target as an extra data byte. Fun.
1333 *
1334 * To detect this case we resample the status register
1335 * and fifo flags. If we're still in a data phase and
1336 * we see spurious chunks in the fifo, we return error
1337 * to the caller which should reset and set things up
1338 * such that we only try future transfers to this
1339 * target in synchronous mode.
1340 */
1341 esp->sreg = esp_read8(ESP_STATUS);
1342 phase = esp->sreg & ESP_STAT_PMASK;
1343 fflags = esp_read8(ESP_FFLAGS);
1344
1345 if ((phase == ESP_DOP &&
1346 (fflags & ESP_FF_ONOTZERO)) ||
1347 (phase == ESP_DIP &&
1348 (fflags & ESP_FF_FBYTES)))
1349 return -1;
1350 }
1351 if (!(ent->flags & ESP_CMD_FLAG_WRITE))
1352 flush_fifo = 1;
1353 }
1354
1355 if (flush_fifo)
1356 esp_flush_fifo(esp);
1357
1358 return bytes_sent;
1359}
1360
1361static void esp_setsync(struct esp *esp, struct esp_target_data *tp,
1362 u8 scsi_period, u8 scsi_offset,
1363 u8 esp_stp, u8 esp_soff)
1364{
1365 spi_period(tp->starget) = scsi_period;
1366 spi_offset(tp->starget) = scsi_offset;
1367 spi_width(tp->starget) = (tp->flags & ESP_TGT_WIDE) ? 1 : 0;
1368
1369 if (esp_soff) {
1370 esp_stp &= 0x1f;
1371 esp_soff |= esp->radelay;
1372 if (esp->rev >= FAS236) {
1373 u8 bit = ESP_CONFIG3_FSCSI;
1374 if (esp->rev >= FAS100A)
1375 bit = ESP_CONFIG3_FAST;
1376
1377 if (scsi_period < 50) {
1378 if (esp->rev == FASHME)
1379 esp_soff &= ~esp->radelay;
1380 tp->esp_config3 |= bit;
1381 } else {
1382 tp->esp_config3 &= ~bit;
1383 }
1384 esp->prev_cfg3 = tp->esp_config3;
1385 esp_write8(esp->prev_cfg3, ESP_CFG3);
1386 }
1387 }
1388
1389 tp->esp_period = esp->prev_stp = esp_stp;
1390 tp->esp_offset = esp->prev_soff = esp_soff;
1391
1392 esp_write8(esp_soff, ESP_SOFF);
1393 esp_write8(esp_stp, ESP_STP);
1394
1395 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1396
1397 spi_display_xfer_agreement(tp->starget);
1398}
1399
1400static void esp_msgin_reject(struct esp *esp)
1401{
1402 struct esp_cmd_entry *ent = esp->active_cmd;
1403 struct scsi_cmnd *cmd = ent->cmd;
1404 struct esp_target_data *tp;
1405 int tgt;
1406
1407 tgt = cmd->device->id;
1408 tp = &esp->target[tgt];
1409
1410 if (tp->flags & ESP_TGT_NEGO_WIDE) {
1411 tp->flags &= ~(ESP_TGT_NEGO_WIDE | ESP_TGT_WIDE);
1412
1413 if (!esp_need_to_nego_sync(tp)) {
1414 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1415 scsi_esp_cmd(esp, ESP_CMD_RATN);
1416 } else {
1417 esp->msg_out_len =
1418 spi_populate_sync_msg(&esp->msg_out[0],
1419 tp->nego_goal_period,
1420 tp->nego_goal_offset);
1421 tp->flags |= ESP_TGT_NEGO_SYNC;
1422 scsi_esp_cmd(esp, ESP_CMD_SATN);
1423 }
1424 return;
1425 }
1426
1427 if (tp->flags & ESP_TGT_NEGO_SYNC) {
1428 tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_CHECK_NEGO);
1429 tp->esp_period = 0;
1430 tp->esp_offset = 0;
1431 esp_setsync(esp, tp, 0, 0, 0, 0);
1432 scsi_esp_cmd(esp, ESP_CMD_RATN);
1433 return;
1434 }
1435
1436 esp->msg_out[0] = ABORT_TASK_SET;
1437 esp->msg_out_len = 1;
1438 scsi_esp_cmd(esp, ESP_CMD_SATN);
1439}
1440
1441static void esp_msgin_sdtr(struct esp *esp, struct esp_target_data *tp)
1442{
1443 u8 period = esp->msg_in[3];
1444 u8 offset = esp->msg_in[4];
1445 u8 stp;
1446
1447 if (!(tp->flags & ESP_TGT_NEGO_SYNC))
1448 goto do_reject;
1449
1450 if (offset > 15)
1451 goto do_reject;
1452
1453 if (offset) {
1454 int rounded_up, one_clock;
1455
1456 if (period > esp->max_period) {
1457 period = offset = 0;
1458 goto do_sdtr;
1459 }
1460 if (period < esp->min_period)
1461 goto do_reject;
1462
1463 one_clock = esp->ccycle / 1000;
1464 rounded_up = (period << 2);
1465 rounded_up = (rounded_up + one_clock - 1) / one_clock;
1466 stp = rounded_up;
1467 if (stp && esp->rev >= FAS236) {
1468 if (stp >= 50)
1469 stp--;
1470 }
1471 } else {
1472 stp = 0;
1473 }
1474
1475 esp_setsync(esp, tp, period, offset, stp, offset);
1476 return;
1477
1478do_reject:
1479 esp->msg_out[0] = MESSAGE_REJECT;
1480 esp->msg_out_len = 1;
1481 scsi_esp_cmd(esp, ESP_CMD_SATN);
1482 return;
1483
1484do_sdtr:
1485 tp->nego_goal_period = period;
1486 tp->nego_goal_offset = offset;
1487 esp->msg_out_len =
1488 spi_populate_sync_msg(&esp->msg_out[0],
1489 tp->nego_goal_period,
1490 tp->nego_goal_offset);
1491 scsi_esp_cmd(esp, ESP_CMD_SATN);
1492}
1493
1494static void esp_msgin_wdtr(struct esp *esp, struct esp_target_data *tp)
1495{
1496 int size = 8 << esp->msg_in[3];
1497 u8 cfg3;
1498
1499 if (esp->rev != FASHME)
1500 goto do_reject;
1501
1502 if (size != 8 && size != 16)
1503 goto do_reject;
1504
1505 if (!(tp->flags & ESP_TGT_NEGO_WIDE))
1506 goto do_reject;
1507
1508 cfg3 = tp->esp_config3;
1509 if (size == 16) {
1510 tp->flags |= ESP_TGT_WIDE;
1511 cfg3 |= ESP_CONFIG3_EWIDE;
1512 } else {
1513 tp->flags &= ~ESP_TGT_WIDE;
1514 cfg3 &= ~ESP_CONFIG3_EWIDE;
1515 }
1516 tp->esp_config3 = cfg3;
1517 esp->prev_cfg3 = cfg3;
1518 esp_write8(cfg3, ESP_CFG3);
1519
1520 tp->flags &= ~ESP_TGT_NEGO_WIDE;
1521
1522 spi_period(tp->starget) = 0;
1523 spi_offset(tp->starget) = 0;
1524 if (!esp_need_to_nego_sync(tp)) {
1525 tp->flags &= ~ESP_TGT_CHECK_NEGO;
1526 scsi_esp_cmd(esp, ESP_CMD_RATN);
1527 } else {
1528 esp->msg_out_len =
1529 spi_populate_sync_msg(&esp->msg_out[0],
1530 tp->nego_goal_period,
1531 tp->nego_goal_offset);
1532 tp->flags |= ESP_TGT_NEGO_SYNC;
1533 scsi_esp_cmd(esp, ESP_CMD_SATN);
1534 }
1535 return;
1536
1537do_reject:
1538 esp->msg_out[0] = MESSAGE_REJECT;
1539 esp->msg_out_len = 1;
1540 scsi_esp_cmd(esp, ESP_CMD_SATN);
1541}
1542
1543static void esp_msgin_extended(struct esp *esp)
1544{
1545 struct esp_cmd_entry *ent = esp->active_cmd;
1546 struct scsi_cmnd *cmd = ent->cmd;
1547 struct esp_target_data *tp;
1548 int tgt = cmd->device->id;
1549
1550 tp = &esp->target[tgt];
1551 if (esp->msg_in[2] == EXTENDED_SDTR) {
1552 esp_msgin_sdtr(esp, tp);
1553 return;
1554 }
1555 if (esp->msg_in[2] == EXTENDED_WDTR) {
1556 esp_msgin_wdtr(esp, tp);
1557 return;
1558 }
1559
1560 printk("ESP: Unexpected extended msg type %x\n",
1561 esp->msg_in[2]);
1562
1563 esp->msg_out[0] = ABORT_TASK_SET;
1564 esp->msg_out_len = 1;
1565 scsi_esp_cmd(esp, ESP_CMD_SATN);
1566}
1567
1568/* Analyze msgin bytes received from target so far. Return non-zero
1569 * if there are more bytes needed to complete the message.
1570 */
1571static int esp_msgin_process(struct esp *esp)
1572{
1573 u8 msg0 = esp->msg_in[0];
1574 int len = esp->msg_in_len;
1575
1576 if (msg0 & 0x80) {
1577 /* Identify */
1578 printk("ESP: Unexpected msgin identify\n");
1579 return 0;
1580 }
1581
1582 switch (msg0) {
1583 case EXTENDED_MESSAGE:
1584 if (len == 1)
1585 return 1;
1586 if (len < esp->msg_in[1] + 2)
1587 return 1;
1588 esp_msgin_extended(esp);
1589 return 0;
1590
1591 case IGNORE_WIDE_RESIDUE: {
1592 struct esp_cmd_entry *ent;
1593 struct esp_cmd_priv *spriv;
1594 if (len == 1)
1595 return 1;
1596
1597 if (esp->msg_in[1] != 1)
1598 goto do_reject;
1599
1600 ent = esp->active_cmd;
1601 spriv = ESP_CMD_PRIV(ent->cmd);
1602
1603 if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
1604 spriv->cur_sg--;
1605 spriv->cur_residue = 1;
1606 } else
1607 spriv->cur_residue++;
1608 spriv->tot_residue++;
1609 return 0;
1610 }
1611 case NOP:
1612 return 0;
1613 case RESTORE_POINTERS:
1614 esp_restore_pointers(esp, esp->active_cmd);
1615 return 0;
1616 case SAVE_POINTERS:
1617 esp_save_pointers(esp, esp->active_cmd);
1618 return 0;
1619
1620 case COMMAND_COMPLETE:
1621 case DISCONNECT: {
1622 struct esp_cmd_entry *ent = esp->active_cmd;
1623
1624 ent->message = msg0;
1625 esp_event(esp, ESP_EVENT_FREE_BUS);
1626 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1627 return 0;
1628 }
1629 case MESSAGE_REJECT:
1630 esp_msgin_reject(esp);
1631 return 0;
1632
1633 default:
1634 do_reject:
1635 esp->msg_out[0] = MESSAGE_REJECT;
1636 esp->msg_out_len = 1;
1637 scsi_esp_cmd(esp, ESP_CMD_SATN);
1638 return 0;
1639 }
1640}
1641
1642static int esp_process_event(struct esp *esp)
1643{
1644 int write;
1645
1646again:
1647 write = 0;
1648 switch (esp->event) {
1649 case ESP_EVENT_CHECK_PHASE:
1650 switch (esp->sreg & ESP_STAT_PMASK) {
1651 case ESP_DOP:
1652 esp_event(esp, ESP_EVENT_DATA_OUT);
1653 break;
1654 case ESP_DIP:
1655 esp_event(esp, ESP_EVENT_DATA_IN);
1656 break;
1657 case ESP_STATP:
1658 esp_flush_fifo(esp);
1659 scsi_esp_cmd(esp, ESP_CMD_ICCSEQ);
1660 esp_event(esp, ESP_EVENT_STATUS);
1661 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1662 return 1;
1663
1664 case ESP_MOP:
1665 esp_event(esp, ESP_EVENT_MSGOUT);
1666 break;
1667
1668 case ESP_MIP:
1669 esp_event(esp, ESP_EVENT_MSGIN);
1670 break;
1671
1672 case ESP_CMDP:
1673 esp_event(esp, ESP_EVENT_CMD_START);
1674 break;
1675
1676 default:
1677 printk("ESP: Unexpected phase, sreg=%02x\n",
1678 esp->sreg);
1679 esp_schedule_reset(esp);
1680 return 0;
1681 }
1682 goto again;
1683 break;
1684
1685 case ESP_EVENT_DATA_IN:
1686 write = 1;
1687 /* fallthru */
1688
1689 case ESP_EVENT_DATA_OUT: {
1690 struct esp_cmd_entry *ent = esp->active_cmd;
1691 struct scsi_cmnd *cmd = ent->cmd;
1692 dma_addr_t dma_addr = esp_cur_dma_addr(ent, cmd);
1693 unsigned int dma_len = esp_cur_dma_len(ent, cmd);
1694
1695 if (esp->rev == ESP100)
1696 scsi_esp_cmd(esp, ESP_CMD_NULL);
1697
1698 if (write)
1699 ent->flags |= ESP_CMD_FLAG_WRITE;
1700 else
1701 ent->flags &= ~ESP_CMD_FLAG_WRITE;
1702
1703 dma_len = esp_dma_length_limit(esp, dma_addr, dma_len);
1704 esp->data_dma_len = dma_len;
1705
1706 if (!dma_len) {
1707 printk(KERN_ERR PFX "esp%d: DMA length is zero!\n",
1708 esp->host->unique_id);
1709 printk(KERN_ERR PFX "esp%d: cur adr[%08x] len[%08x]\n",
1710 esp->host->unique_id,
1711 esp_cur_dma_addr(ent, cmd),
1712 esp_cur_dma_len(ent, cmd));
1713 esp_schedule_reset(esp);
1714 return 0;
1715 }
1716
1717 esp_log_datastart("ESP: start data addr[%08x] len[%u] "
1718 "write(%d)\n",
1719 dma_addr, dma_len, write);
1720
1721 esp->ops->send_dma_cmd(esp, dma_addr, dma_len, dma_len,
1722 write, ESP_CMD_DMA | ESP_CMD_TI);
1723 esp_event(esp, ESP_EVENT_DATA_DONE);
1724 break;
1725 }
1726 case ESP_EVENT_DATA_DONE: {
1727 struct esp_cmd_entry *ent = esp->active_cmd;
1728 struct scsi_cmnd *cmd = ent->cmd;
1729 int bytes_sent;
1730
1731 if (esp->ops->dma_error(esp)) {
1732 printk("ESP: data done, DMA error, resetting\n");
1733 esp_schedule_reset(esp);
1734 return 0;
1735 }
1736
1737 if (ent->flags & ESP_CMD_FLAG_WRITE) {
1738 /* XXX parity errors, etc. XXX */
1739
1740 esp->ops->dma_drain(esp);
1741 }
1742 esp->ops->dma_invalidate(esp);
1743
1744 if (esp->ireg != ESP_INTR_BSERV) {
1745 /* We should always see exactly a bus-service
1746 * interrupt at the end of a successful transfer.
1747 */
1748 printk("ESP: data done, not BSERV, resetting\n");
1749 esp_schedule_reset(esp);
1750 return 0;
1751 }
1752
1753 bytes_sent = esp_data_bytes_sent(esp, ent, cmd);
1754
1755 esp_log_datadone("ESP: data done flgs[%x] sent[%d]\n",
1756 ent->flags, bytes_sent);
1757
1758 if (bytes_sent < 0) {
1759 /* XXX force sync mode for this target XXX */
1760 esp_schedule_reset(esp);
1761 return 0;
1762 }
1763
1764 esp_advance_dma(esp, ent, cmd, bytes_sent);
1765 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1766 goto again;
1767 break;
1768 }
1769
1770 case ESP_EVENT_STATUS: {
1771 struct esp_cmd_entry *ent = esp->active_cmd;
1772
1773 if (esp->ireg & ESP_INTR_FDONE) {
1774 ent->status = esp_read8(ESP_FDATA);
1775 ent->message = esp_read8(ESP_FDATA);
1776 scsi_esp_cmd(esp, ESP_CMD_MOK);
1777 } else if (esp->ireg == ESP_INTR_BSERV) {
1778 ent->status = esp_read8(ESP_FDATA);
1779 ent->message = 0xff;
1780 esp_event(esp, ESP_EVENT_MSGIN);
1781 return 0;
1782 }
1783
1784 if (ent->message != COMMAND_COMPLETE) {
1785 printk("ESP: Unexpected message %x in status\n",
1786 ent->message);
1787 esp_schedule_reset(esp);
1788 return 0;
1789 }
1790
1791 esp_event(esp, ESP_EVENT_FREE_BUS);
1792 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1793 break;
1794 }
1795 case ESP_EVENT_FREE_BUS: {
1796 struct esp_cmd_entry *ent = esp->active_cmd;
1797 struct scsi_cmnd *cmd = ent->cmd;
1798
1799 if (ent->message == COMMAND_COMPLETE ||
1800 ent->message == DISCONNECT)
1801 scsi_esp_cmd(esp, ESP_CMD_ESEL);
1802
1803 if (ent->message == COMMAND_COMPLETE) {
1804 esp_log_cmddone("ESP: Command done status[%x] "
1805 "message[%x]\n",
1806 ent->status, ent->message);
1807 if (ent->status == SAM_STAT_TASK_SET_FULL)
1808 esp_event_queue_full(esp, ent);
1809
1810 if (ent->status == SAM_STAT_CHECK_CONDITION &&
1811 !(ent->flags & ESP_CMD_FLAG_AUTOSENSE)) {
1812 ent->flags |= ESP_CMD_FLAG_AUTOSENSE;
1813 esp_autosense(esp, ent);
1814 } else {
1815 esp_cmd_is_done(esp, ent, cmd,
1816 compose_result(ent->status,
1817 ent->message,
1818 DID_OK));
1819 }
1820 } else if (ent->message == DISCONNECT) {
1821 esp_log_disconnect("ESP: Disconnecting tgt[%d] "
1822 "tag[%x:%x]\n",
1823 cmd->device->id,
1824 ent->tag[0], ent->tag[1]);
1825
1826 esp->active_cmd = NULL;
1827 esp_maybe_execute_command(esp);
1828 } else {
1829 printk("ESP: Unexpected message %x in freebus\n",
1830 ent->message);
1831 esp_schedule_reset(esp);
1832 return 0;
1833 }
1834 if (esp->active_cmd)
1835 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1836 break;
1837 }
1838 case ESP_EVENT_MSGOUT: {
1839 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1840
1841 if (esp_debug & ESP_DEBUG_MSGOUT) {
1842 int i;
1843 printk("ESP: Sending message [ ");
1844 for (i = 0; i < esp->msg_out_len; i++)
1845 printk("%02x ", esp->msg_out[i]);
1846 printk("]\n");
1847 }
1848
1849 if (esp->rev == FASHME) {
1850 int i;
1851
1852 /* Always use the fifo. */
1853 for (i = 0; i < esp->msg_out_len; i++) {
1854 esp_write8(esp->msg_out[i], ESP_FDATA);
1855 esp_write8(0, ESP_FDATA);
1856 }
1857 scsi_esp_cmd(esp, ESP_CMD_TI);
1858 } else {
1859 if (esp->msg_out_len == 1) {
1860 esp_write8(esp->msg_out[0], ESP_FDATA);
1861 scsi_esp_cmd(esp, ESP_CMD_TI);
1862 } else {
1863 /* Use DMA. */
1864 memcpy(esp->command_block,
1865 esp->msg_out,
1866 esp->msg_out_len);
1867
1868 esp->ops->send_dma_cmd(esp,
1869 esp->command_block_dma,
1870 esp->msg_out_len,
1871 esp->msg_out_len,
1872 0,
1873 ESP_CMD_DMA|ESP_CMD_TI);
1874 }
1875 }
1876 esp_event(esp, ESP_EVENT_MSGOUT_DONE);
1877 break;
1878 }
1879 case ESP_EVENT_MSGOUT_DONE:
1880 if (esp->rev == FASHME) {
1881 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1882 } else {
1883 if (esp->msg_out_len > 1)
1884 esp->ops->dma_invalidate(esp);
1885 }
1886
1887 if (!(esp->ireg & ESP_INTR_DC)) {
1888 if (esp->rev != FASHME)
1889 scsi_esp_cmd(esp, ESP_CMD_NULL);
1890 }
1891 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1892 goto again;
1893 case ESP_EVENT_MSGIN:
1894 if (esp->ireg & ESP_INTR_BSERV) {
1895 if (esp->rev == FASHME) {
1896 if (!(esp_read8(ESP_STATUS2) &
1897 ESP_STAT2_FEMPTY))
1898 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1899 } else {
1900 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1901 if (esp->rev == ESP100)
1902 scsi_esp_cmd(esp, ESP_CMD_NULL);
1903 }
1904 scsi_esp_cmd(esp, ESP_CMD_TI);
1905 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1906 return 1;
1907 }
1908 if (esp->ireg & ESP_INTR_FDONE) {
1909 u8 val;
1910
1911 if (esp->rev == FASHME)
1912 val = esp->fifo[0];
1913 else
1914 val = esp_read8(ESP_FDATA);
1915 esp->msg_in[esp->msg_in_len++] = val;
1916
1917 esp_log_msgin("ESP: Got msgin byte %x\n", val);
1918
1919 if (!esp_msgin_process(esp))
1920 esp->msg_in_len = 0;
1921
1922 if (esp->rev == FASHME)
1923 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1924
1925 scsi_esp_cmd(esp, ESP_CMD_MOK);
1926
1927 if (esp->event != ESP_EVENT_FREE_BUS)
1928 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1929 } else {
1930 printk("ESP: MSGIN neither BSERV not FDON, resetting");
1931 esp_schedule_reset(esp);
1932 return 0;
1933 }
1934 break;
1935 case ESP_EVENT_CMD_START:
1936 memcpy(esp->command_block, esp->cmd_bytes_ptr,
1937 esp->cmd_bytes_left);
1938 if (esp->rev == FASHME)
1939 scsi_esp_cmd(esp, ESP_CMD_FLUSH);
1940 esp->ops->send_dma_cmd(esp, esp->command_block_dma,
1941 esp->cmd_bytes_left, 16, 0,
1942 ESP_CMD_DMA | ESP_CMD_TI);
1943 esp_event(esp, ESP_EVENT_CMD_DONE);
1944 esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
1945 break;
1946 case ESP_EVENT_CMD_DONE:
1947 esp->ops->dma_invalidate(esp);
1948 if (esp->ireg & ESP_INTR_BSERV) {
1949 esp_event(esp, ESP_EVENT_CHECK_PHASE);
1950 goto again;
1951 }
1952 esp_schedule_reset(esp);
1953 return 0;
1954 break;
1955
1956 case ESP_EVENT_RESET:
1957 scsi_esp_cmd(esp, ESP_CMD_RS);
1958 break;
1959
1960 default:
1961 printk("ESP: Unexpected event %x, resetting\n",
1962 esp->event);
1963 esp_schedule_reset(esp);
1964 return 0;
1965 break;
1966 }
1967 return 1;
1968}
1969
1970static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
1971{
1972 struct scsi_cmnd *cmd = ent->cmd;
1973
1974 esp_unmap_dma(esp, cmd);
1975 esp_free_lun_tag(ent, cmd->device->hostdata);
1976 cmd->result = DID_RESET << 16;
1977
1978 if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
1979 esp->ops->unmap_single(esp, ent->sense_dma,
1980 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1981 ent->sense_ptr = NULL;
1982 }
1983
1984 cmd->scsi_done(cmd);
1985 list_del(&ent->list);
1986 esp_put_ent(esp, ent);
1987}
1988
1989static void esp_clear_hold(struct scsi_device *dev, void *data)
1990{
1991 struct esp_lun_data *lp = dev->hostdata;
1992
1993 BUG_ON(lp->num_tagged);
1994 lp->hold = 0;
1995}
1996
1997static void esp_reset_cleanup(struct esp *esp)
1998{
1999 struct esp_cmd_entry *ent, *tmp;
2000 int i;
2001
2002 list_for_each_entry_safe(ent, tmp, &esp->queued_cmds, list) {
2003 struct scsi_cmnd *cmd = ent->cmd;
2004
2005 list_del(&ent->list);
2006 cmd->result = DID_RESET << 16;
2007 cmd->scsi_done(cmd);
2008 esp_put_ent(esp, ent);
2009 }
2010
2011 list_for_each_entry_safe(ent, tmp, &esp->active_cmds, list) {
2012 if (ent == esp->active_cmd)
2013 esp->active_cmd = NULL;
2014 esp_reset_cleanup_one(esp, ent);
2015 }
2016
2017 BUG_ON(esp->active_cmd != NULL);
2018
2019 /* Force renegotiation of sync/wide transfers. */
2020 for (i = 0; i < ESP_MAX_TARGET; i++) {
2021 struct esp_target_data *tp = &esp->target[i];
2022
2023 tp->esp_period = 0;
2024 tp->esp_offset = 0;
2025 tp->esp_config3 &= ~(ESP_CONFIG3_EWIDE |
2026 ESP_CONFIG3_FSCSI |
2027 ESP_CONFIG3_FAST);
2028 tp->flags &= ~ESP_TGT_WIDE;
2029 tp->flags |= ESP_TGT_CHECK_NEGO;
2030
2031 if (tp->starget)
2032 starget_for_each_device(tp->starget, NULL,
2033 esp_clear_hold);
2034 }
2035}
2036
2037/* Runs under host->lock */
2038static void __esp_interrupt(struct esp *esp)
2039{
2040 int finish_reset, intr_done;
2041 u8 phase;
2042
2043 esp->sreg = esp_read8(ESP_STATUS);
2044
2045 if (esp->flags & ESP_FLAG_RESETTING) {
2046 finish_reset = 1;
2047 } else {
2048 if (esp_check_gross_error(esp))
2049 return;
2050
2051 finish_reset = esp_check_spur_intr(esp);
2052 if (finish_reset < 0)
2053 return;
2054 }
2055
2056 esp->ireg = esp_read8(ESP_INTRPT);
2057
2058 if (esp->ireg & ESP_INTR_SR)
2059 finish_reset = 1;
2060
2061 if (finish_reset) {
2062 esp_reset_cleanup(esp);
2063 if (esp->eh_reset) {
2064 complete(esp->eh_reset);
2065 esp->eh_reset = NULL;
2066 }
2067 return;
2068 }
2069
2070 phase = (esp->sreg & ESP_STAT_PMASK);
2071 if (esp->rev == FASHME) {
2072 if (((phase != ESP_DIP && phase != ESP_DOP) &&
2073 esp->select_state == ESP_SELECT_NONE &&
2074 esp->event != ESP_EVENT_STATUS &&
2075 esp->event != ESP_EVENT_DATA_DONE) ||
2076 (esp->ireg & ESP_INTR_RSEL)) {
2077 esp->sreg2 = esp_read8(ESP_STATUS2);
2078 if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
2079 (esp->sreg2 & ESP_STAT2_F1BYTE))
2080 hme_read_fifo(esp);
2081 }
2082 }
2083
2084 esp_log_intr("ESP: intr sreg[%02x] seqreg[%02x] "
2085 "sreg2[%02x] ireg[%02x]\n",
2086 esp->sreg, esp->seqreg, esp->sreg2, esp->ireg);
2087
2088 intr_done = 0;
2089
2090 if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN | ESP_INTR_IC)) {
2091 printk("ESP: unexpected IREG %02x\n", esp->ireg);
2092 if (esp->ireg & ESP_INTR_IC)
2093 esp_dump_cmd_log(esp);
2094
2095 esp_schedule_reset(esp);
2096 } else {
2097 if (!(esp->ireg & ESP_INTR_RSEL)) {
2098 /* Some combination of FDONE, BSERV, DC. */
2099 if (esp->select_state != ESP_SELECT_NONE)
2100 intr_done = esp_finish_select(esp);
2101 } else if (esp->ireg & ESP_INTR_RSEL) {
2102 if (esp->active_cmd)
2103 (void) esp_finish_select(esp);
2104 intr_done = esp_reconnect(esp);
2105 }
2106 }
2107 while (!intr_done)
2108 intr_done = esp_process_event(esp);
2109}
2110
2111irqreturn_t scsi_esp_intr(int irq, void *dev_id)
2112{
2113 struct esp *esp = dev_id;
2114 unsigned long flags;
2115 irqreturn_t ret;
2116
2117 spin_lock_irqsave(esp->host->host_lock, flags);
2118 ret = IRQ_NONE;
2119 if (esp->ops->irq_pending(esp)) {
2120 ret = IRQ_HANDLED;
2121 for (;;) {
2122 int i;
2123
2124 __esp_interrupt(esp);
2125 if (!(esp->flags & ESP_FLAG_QUICKIRQ_CHECK))
2126 break;
2127 esp->flags &= ~ESP_FLAG_QUICKIRQ_CHECK;
2128
2129 for (i = 0; i < ESP_QUICKIRQ_LIMIT; i++) {
2130 if (esp->ops->irq_pending(esp))
2131 break;
2132 }
2133 if (i == ESP_QUICKIRQ_LIMIT)
2134 break;
2135 }
2136 }
2137 spin_unlock_irqrestore(esp->host->host_lock, flags);
2138
2139 return ret;
2140}
2141EXPORT_SYMBOL(scsi_esp_intr);
2142
2143static void __devinit esp_get_revision(struct esp *esp)
2144{
2145 u8 val;
2146
2147 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
2148 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
2149 esp_write8(esp->config2, ESP_CFG2);
2150
2151 val = esp_read8(ESP_CFG2);
2152 val &= ~ESP_CONFIG2_MAGIC;
2153 if (val != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
2154 /* If what we write to cfg2 does not come back, cfg2 is not
2155 * implemented, therefore this must be a plain esp100.
2156 */
2157 esp->rev = ESP100;
2158 } else {
2159 esp->config2 = 0;
2160 esp_set_all_config3(esp, 5);
2161 esp->prev_cfg3 = 5;
2162 esp_write8(esp->config2, ESP_CFG2);
2163 esp_write8(0, ESP_CFG3);
2164 esp_write8(esp->prev_cfg3, ESP_CFG3);
2165
2166 val = esp_read8(ESP_CFG3);
2167 if (val != 5) {
2168 /* The cfg2 register is implemented, however
2169 * cfg3 is not, must be esp100a.
2170 */
2171 esp->rev = ESP100A;
2172 } else {
2173 esp_set_all_config3(esp, 0);
2174 esp->prev_cfg3 = 0;
2175 esp_write8(esp->prev_cfg3, ESP_CFG3);
2176
2177 /* All of cfg{1,2,3} implemented, must be one of
2178 * the fas variants, figure out which one.
2179 */
2180 if (esp->cfact == 0 || esp->cfact > ESP_CCF_F5) {
2181 esp->rev = FAST;
2182 esp->sync_defp = SYNC_DEFP_FAST;
2183 } else {
2184 esp->rev = ESP236;
2185 }
2186 esp->config2 = 0;
2187 esp_write8(esp->config2, ESP_CFG2);
2188 }
2189 }
2190}
2191
2192static void __devinit esp_init_swstate(struct esp *esp)
2193{
2194 int i;
2195
2196 INIT_LIST_HEAD(&esp->queued_cmds);
2197 INIT_LIST_HEAD(&esp->active_cmds);
2198 INIT_LIST_HEAD(&esp->esp_cmd_pool);
2199
2200 /* Start with a clear state, domain validation (via ->slave_configure,
2201 * spi_dv_device()) will attempt to enable SYNC, WIDE, and tagged
2202 * commands.
2203 */
2204 for (i = 0 ; i < ESP_MAX_TARGET; i++) {
2205 esp->target[i].flags = 0;
2206 esp->target[i].nego_goal_period = 0;
2207 esp->target[i].nego_goal_offset = 0;
2208 esp->target[i].nego_goal_width = 0;
2209 esp->target[i].nego_goal_tags = 0;
2210 }
2211}
2212
2213/* This places the ESP into a known state at boot time. */
2214static void __devinit esp_bootup_reset(struct esp *esp)
2215{
2216 u8 val;
2217
2218 /* Reset the DMA */
2219 esp->ops->reset_dma(esp);
2220
2221 /* Reset the ESP */
2222 esp_reset_esp(esp);
2223
2224 /* Reset the SCSI bus, but tell ESP not to generate an irq */
2225 val = esp_read8(ESP_CFG1);
2226 val |= ESP_CONFIG1_SRRDISAB;
2227 esp_write8(val, ESP_CFG1);
2228
2229 scsi_esp_cmd(esp, ESP_CMD_RS);
2230 udelay(400);
2231
2232 esp_write8(esp->config1, ESP_CFG1);
2233
2234 /* Eat any bitrot in the chip and we are done... */
2235 esp_read8(ESP_INTRPT);
2236}
2237
2238static void __devinit esp_set_clock_params(struct esp *esp)
2239{
2240 int fmhz;
2241 u8 ccf;
2242
2243 /* This is getting messy but it has to be done correctly or else
2244 * you get weird behavior all over the place. We are trying to
2245 * basically figure out three pieces of information.
2246 *
2247 * a) Clock Conversion Factor
2248 *
2249 * This is a representation of the input crystal clock frequency
2250 * going into the ESP on this machine. Any operation whose timing
2251 * is longer than 400ns depends on this value being correct. For
2252 * example, you'll get blips for arbitration/selection during high
2253 * load or with multiple targets if this is not set correctly.
2254 *
2255 * b) Selection Time-Out
2256 *
2257 * The ESP isn't very bright and will arbitrate for the bus and try
2258 * to select a target forever if you let it. This value tells the
2259 * ESP when it has taken too long to negotiate and that it should
2260 * interrupt the CPU so we can see what happened. The value is
2261 * computed as follows (from NCR/Symbios chip docs).
2262 *
2263 * (Time Out Period) * (Input Clock)
2264 * STO = ----------------------------------
2265 * (8192) * (Clock Conversion Factor)
2266 *
2267 * We use a time out period of 250ms (ESP_BUS_TIMEOUT).
2268 *
2269 * c) Imperical constants for synchronous offset and transfer period
2270 * register values
2271 *
2272 * This entails the smallest and largest sync period we could ever
2273 * handle on this ESP.
2274 */
2275 fmhz = esp->cfreq;
2276
2277 ccf = ((fmhz / 1000000) + 4) / 5;
2278 if (ccf == 1)
2279 ccf = 2;
2280
2281 /* If we can't find anything reasonable, just assume 20MHZ.
2282 * This is the clock frequency of the older sun4c's where I've
2283 * been unable to find the clock-frequency PROM property. All
2284 * other machines provide useful values it seems.
2285 */
2286 if (fmhz <= 5000000 || ccf < 1 || ccf > 8) {
2287 fmhz = 20000000;
2288 ccf = 4;
2289 }
2290
2291 esp->cfact = (ccf == 8 ? 0 : ccf);
2292 esp->cfreq = fmhz;
2293 esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
2294 esp->ctick = ESP_TICK(ccf, esp->ccycle);
2295 esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
2296 esp->sync_defp = SYNC_DEFP_SLOW;
2297}
2298
2299static const char *esp_chip_names[] = {
2300 "ESP100",
2301 "ESP100A",
2302 "ESP236",
2303 "FAS236",
2304 "FAS100A",
2305 "FAST",
2306 "FASHME",
2307};
2308
2309static struct scsi_transport_template *esp_transport_template;
2310
2311int __devinit scsi_esp_register(struct esp *esp, struct device *dev)
2312{
2313 static int instance;
2314 int err;
2315
2316 esp->host->transportt = esp_transport_template;
2317 esp->host->max_lun = ESP_MAX_LUN;
2318 esp->host->cmd_per_lun = 2;
2319
2320 esp_set_clock_params(esp);
2321
2322 esp_get_revision(esp);
2323
2324 esp_init_swstate(esp);
2325
2326 esp_bootup_reset(esp);
2327
2328 printk(KERN_INFO PFX "esp%u, regs[%1p:%1p] irq[%u]\n",
2329 esp->host->unique_id, esp->regs, esp->dma_regs,
2330 esp->host->irq);
2331 printk(KERN_INFO PFX "esp%u is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
2332 esp->host->unique_id, esp_chip_names[esp->rev],
2333 esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
2334
2335 /* Let the SCSI bus reset settle. */
2336 ssleep(esp_bus_reset_settle);
2337
2338 err = scsi_add_host(esp->host, dev);
2339 if (err)
2340 return err;
2341
2342 esp->host->unique_id = instance++;
2343
2344 scsi_scan_host(esp->host);
2345
2346 return 0;
2347}
2348EXPORT_SYMBOL(scsi_esp_register);
2349
2350void __devexit scsi_esp_unregister(struct esp *esp)
2351{
2352 scsi_remove_host(esp->host);
2353}
2354EXPORT_SYMBOL(scsi_esp_unregister);
2355
2356static int esp_slave_alloc(struct scsi_device *dev)
2357{
2358 struct esp *esp = host_to_esp(dev->host);
2359 struct esp_target_data *tp = &esp->target[dev->id];
2360 struct esp_lun_data *lp;
2361
2362 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
2363 if (!lp)
2364 return -ENOMEM;
2365 dev->hostdata = lp;
2366
2367 tp->starget = dev->sdev_target;
2368
2369 spi_min_period(tp->starget) = esp->min_period;
2370 spi_max_offset(tp->starget) = 15;
2371
2372 if (esp->flags & ESP_FLAG_WIDE_CAPABLE)
2373 spi_max_width(tp->starget) = 1;
2374 else
2375 spi_max_width(tp->starget) = 0;
2376
2377 return 0;
2378}
2379
2380static int esp_slave_configure(struct scsi_device *dev)
2381{
2382 struct esp *esp = host_to_esp(dev->host);
2383 struct esp_target_data *tp = &esp->target[dev->id];
2384 int goal_tags, queue_depth;
2385
2386 goal_tags = 0;
2387
2388 if (dev->tagged_supported) {
2389 /* XXX make this configurable somehow XXX */
2390 goal_tags = ESP_DEFAULT_TAGS;
2391
2392 if (goal_tags > ESP_MAX_TAG)
2393 goal_tags = ESP_MAX_TAG;
2394 }
2395
2396 queue_depth = goal_tags;
2397 if (queue_depth < dev->host->cmd_per_lun)
2398 queue_depth = dev->host->cmd_per_lun;
2399
2400 if (goal_tags) {
2401 scsi_set_tag_type(dev, MSG_ORDERED_TAG);
2402 scsi_activate_tcq(dev, queue_depth);
2403 } else {
2404 scsi_deactivate_tcq(dev, queue_depth);
2405 }
2406 tp->flags |= ESP_TGT_DISCONNECT;
2407
2408 if (!spi_initial_dv(dev->sdev_target))
2409 spi_dv_device(dev);
2410
2411 return 0;
2412}
2413
2414static void esp_slave_destroy(struct scsi_device *dev)
2415{
2416 struct esp_lun_data *lp = dev->hostdata;
2417
2418 kfree(lp);
2419 dev->hostdata = NULL;
2420}
2421
2422static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
2423{
2424 struct esp *esp = host_to_esp(cmd->device->host);
2425 struct esp_cmd_entry *ent, *tmp;
2426 struct completion eh_done;
2427 unsigned long flags;
2428
2429 /* XXX This helps a lot with debugging but might be a bit
2430 * XXX much for the final driver.
2431 */
2432 spin_lock_irqsave(esp->host->host_lock, flags);
2433 printk(KERN_ERR PFX "esp%d: Aborting command [%p:%02x]\n",
2434 esp->host->unique_id, cmd, cmd->cmnd[0]);
2435 ent = esp->active_cmd;
2436 if (ent)
2437 printk(KERN_ERR PFX "esp%d: Current command [%p:%02x]\n",
2438 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2439 list_for_each_entry(ent, &esp->queued_cmds, list) {
2440 printk(KERN_ERR PFX "esp%d: Queued command [%p:%02x]\n",
2441 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2442 }
2443 list_for_each_entry(ent, &esp->active_cmds, list) {
2444 printk(KERN_ERR PFX "esp%d: Active command [%p:%02x]\n",
2445 esp->host->unique_id, ent->cmd, ent->cmd->cmnd[0]);
2446 }
2447 esp_dump_cmd_log(esp);
2448 spin_unlock_irqrestore(esp->host->host_lock, flags);
2449
2450 spin_lock_irqsave(esp->host->host_lock, flags);
2451
2452 ent = NULL;
2453 list_for_each_entry(tmp, &esp->queued_cmds, list) {
2454 if (tmp->cmd == cmd) {
2455 ent = tmp;
2456 break;
2457 }
2458 }
2459
2460 if (ent) {
2461 /* Easiest case, we didn't even issue the command
2462 * yet so it is trivial to abort.
2463 */
2464 list_del(&ent->list);
2465
2466 cmd->result = DID_ABORT << 16;
2467 cmd->scsi_done(cmd);
2468
2469 esp_put_ent(esp, ent);
2470
2471 goto out_success;
2472 }
2473
2474 init_completion(&eh_done);
2475
2476 ent = esp->active_cmd;
2477 if (ent && ent->cmd == cmd) {
2478 /* Command is the currently active command on
2479 * the bus. If we already have an output message
2480 * pending, no dice.
2481 */
2482 if (esp->msg_out_len)
2483 goto out_failure;
2484
2485 /* Send out an abort, encouraging the target to
2486 * go to MSGOUT phase by asserting ATN.
2487 */
2488 esp->msg_out[0] = ABORT_TASK_SET;
2489 esp->msg_out_len = 1;
2490 ent->eh_done = &eh_done;
2491
2492 scsi_esp_cmd(esp, ESP_CMD_SATN);
2493 } else {
2494 /* The command is disconnected. This is not easy to
2495 * abort. For now we fail and let the scsi error
2496 * handling layer go try a scsi bus reset or host
2497 * reset.
2498 *
2499 * What we could do is put together a scsi command
2500 * solely for the purpose of sending an abort message
2501 * to the target. Coming up with all the code to
2502 * cook up scsi commands, special case them everywhere,
2503 * etc. is for questionable gain and it would be better
2504 * if the generic scsi error handling layer could do at
2505 * least some of that for us.
2506 *
2507 * Anyways this is an area for potential future improvement
2508 * in this driver.
2509 */
2510 goto out_failure;
2511 }
2512
2513 spin_unlock_irqrestore(esp->host->host_lock, flags);
2514
2515 if (!wait_for_completion_timeout(&eh_done, 5 * HZ)) {
2516 spin_lock_irqsave(esp->host->host_lock, flags);
2517 ent->eh_done = NULL;
2518 spin_unlock_irqrestore(esp->host->host_lock, flags);
2519
2520 return FAILED;
2521 }
2522
2523 return SUCCESS;
2524
2525out_success:
2526 spin_unlock_irqrestore(esp->host->host_lock, flags);
2527 return SUCCESS;
2528
2529out_failure:
2530 /* XXX This might be a good location to set ESP_TGT_BROKEN
2531 * XXX since we know which target/lun in particular is
2532 * XXX causing trouble.
2533 */
2534 spin_unlock_irqrestore(esp->host->host_lock, flags);
2535 return FAILED;
2536}
2537
2538static int esp_eh_bus_reset_handler(struct scsi_cmnd *cmd)
2539{
2540 struct esp *esp = host_to_esp(cmd->device->host);
2541 struct completion eh_reset;
2542 unsigned long flags;
2543
2544 init_completion(&eh_reset);
2545
2546 spin_lock_irqsave(esp->host->host_lock, flags);
2547
2548 esp->eh_reset = &eh_reset;
2549
2550 /* XXX This is too simple... We should add lots of
2551 * XXX checks here so that if we find that the chip is
2552 * XXX very wedged we return failure immediately so
2553 * XXX that we can perform a full chip reset.
2554 */
2555 esp->flags |= ESP_FLAG_RESETTING;
2556 scsi_esp_cmd(esp, ESP_CMD_RS);
2557
2558 spin_unlock_irqrestore(esp->host->host_lock, flags);
2559
2560 ssleep(esp_bus_reset_settle);
2561
2562 if (!wait_for_completion_timeout(&eh_reset, 5 * HZ)) {
2563 spin_lock_irqsave(esp->host->host_lock, flags);
2564 esp->eh_reset = NULL;
2565 spin_unlock_irqrestore(esp->host->host_lock, flags);
2566
2567 return FAILED;
2568 }
2569
2570 return SUCCESS;
2571}
2572
2573/* All bets are off, reset the entire device. */
2574static int esp_eh_host_reset_handler(struct scsi_cmnd *cmd)
2575{
2576 struct esp *esp = host_to_esp(cmd->device->host);
2577 unsigned long flags;
2578
2579 spin_lock_irqsave(esp->host->host_lock, flags);
2580 esp_bootup_reset(esp);
2581 esp_reset_cleanup(esp);
2582 spin_unlock_irqrestore(esp->host->host_lock, flags);
2583
2584 ssleep(esp_bus_reset_settle);
2585
2586 return SUCCESS;
2587}
2588
2589static const char *esp_info(struct Scsi_Host *host)
2590{
2591 return "esp";
2592}
2593
2594struct scsi_host_template scsi_esp_template = {
2595 .module = THIS_MODULE,
2596 .name = "esp",
2597 .info = esp_info,
2598 .queuecommand = esp_queuecommand,
2599 .slave_alloc = esp_slave_alloc,
2600 .slave_configure = esp_slave_configure,
2601 .slave_destroy = esp_slave_destroy,
2602 .eh_abort_handler = esp_eh_abort_handler,
2603 .eh_bus_reset_handler = esp_eh_bus_reset_handler,
2604 .eh_host_reset_handler = esp_eh_host_reset_handler,
2605 .can_queue = 7,
2606 .this_id = 7,
2607 .sg_tablesize = SG_ALL,
2608 .use_clustering = ENABLE_CLUSTERING,
2609 .max_sectors = 0xffff,
2610 .skip_settle_delay = 1,
2611};
2612EXPORT_SYMBOL(scsi_esp_template);
2613
2614static void esp_get_signalling(struct Scsi_Host *host)
2615{
2616 struct esp *esp = host_to_esp(host);
2617 enum spi_signal_type type;
2618
2619 if (esp->flags & ESP_FLAG_DIFFERENTIAL)
2620 type = SPI_SIGNAL_HVD;
2621 else
2622 type = SPI_SIGNAL_SE;
2623
2624 spi_signalling(host) = type;
2625}
2626
2627static void esp_set_offset(struct scsi_target *target, int offset)
2628{
2629 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2630 struct esp *esp = host_to_esp(host);
2631 struct esp_target_data *tp = &esp->target[target->id];
2632
2633 tp->nego_goal_offset = offset;
2634 tp->flags |= ESP_TGT_CHECK_NEGO;
2635}
2636
2637static void esp_set_period(struct scsi_target *target, int period)
2638{
2639 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2640 struct esp *esp = host_to_esp(host);
2641 struct esp_target_data *tp = &esp->target[target->id];
2642
2643 tp->nego_goal_period = period;
2644 tp->flags |= ESP_TGT_CHECK_NEGO;
2645}
2646
2647static void esp_set_width(struct scsi_target *target, int width)
2648{
2649 struct Scsi_Host *host = dev_to_shost(target->dev.parent);
2650 struct esp *esp = host_to_esp(host);
2651 struct esp_target_data *tp = &esp->target[target->id];
2652
2653 tp->nego_goal_width = (width ? 1 : 0);
2654 tp->flags |= ESP_TGT_CHECK_NEGO;
2655}
2656
2657static struct spi_function_template esp_transport_ops = {
2658 .set_offset = esp_set_offset,
2659 .show_offset = 1,
2660 .set_period = esp_set_period,
2661 .show_period = 1,
2662 .set_width = esp_set_width,
2663 .show_width = 1,
2664 .get_signalling = esp_get_signalling,
2665};
2666
2667static int __init esp_init(void)
2668{
2669 BUILD_BUG_ON(sizeof(struct scsi_pointer) <
2670 sizeof(struct esp_cmd_priv));
2671
2672 esp_transport_template = spi_attach_transport(&esp_transport_ops);
2673 if (!esp_transport_template)
2674 return -ENODEV;
2675
2676 return 0;
2677}
2678
2679static void __exit esp_exit(void)
2680{
2681 spi_release_transport(esp_transport_template);
2682}
2683
2684MODULE_DESCRIPTION("ESP SCSI driver core");
2685MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
2686MODULE_LICENSE("GPL");
2687MODULE_VERSION(DRV_VERSION);
2688
2689module_param(esp_bus_reset_settle, int, 0);
2690MODULE_PARM_DESC(esp_bus_reset_settle,
2691 "ESP scsi bus reset delay in seconds");
2692
2693module_param(esp_debug, int, 0);
2694MODULE_PARM_DESC(esp_debug,
2695"ESP bitmapped debugging message enable value:\n"
2696" 0x00000001 Log interrupt events\n"
2697" 0x00000002 Log scsi commands\n"
2698" 0x00000004 Log resets\n"
2699" 0x00000008 Log message in events\n"
2700" 0x00000010 Log message out events\n"
2701" 0x00000020 Log command completion\n"
2702" 0x00000040 Log disconnects\n"
2703" 0x00000080 Log data start\n"
2704" 0x00000100 Log data done\n"
2705" 0x00000200 Log reconnects\n"
2706" 0x00000400 Log auto-sense data\n"
2707);
2708
2709module_init(esp_init);
2710module_exit(esp_exit);
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h
new file mode 100644
index 00000000000..8d4a6690401
--- /dev/null
+++ b/drivers/scsi/esp_scsi.h
@@ -0,0 +1,560 @@
1/* esp_scsi.h: Defines and structures for the ESP drier.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6#ifndef _ESP_SCSI_H
7#define _ESP_SCSI_H
8
9 /* Access Description Offset */
10#define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */
11#define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */
12#define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */
13#define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */
14#define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */
15#define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */
16#define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */
17#define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */
18#define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */
19#define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */
20#define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */
21#define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */
22#define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */
23#define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */
24#define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */
25#define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */
26#define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */
27#define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */
28#define ESP_TCHI 0x0eUL /* rw High bits transf count 0x38 */
29#define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */
30#define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */
31#define ESP_FGRND 0x0fUL /* rw Data base for fifo 0x3c */
32#define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */
33
34#define SBUS_ESP_REG_SIZE 0x40UL
35
36/* Bitfield meanings for the above registers. */
37
38/* ESP config reg 1, read-write, found on all ESP chips */
39#define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */
40#define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */
41#define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */
42#define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */
43#define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */
44#define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */
45
46/* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */
47#define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */
48#define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */
49#define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */
50#define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tgtmode) */
51#define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */
52#define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */
53#define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */
54#define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */
55#define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,216) */
56#define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */
57#define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */
58#define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */
59#define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */
60
61/* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */
62#define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */
63#define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */
64#define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */
65#define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */
66#define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */
67#define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */
68#define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */
69#define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */
70#define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */
71#define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */
72#define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */
73#define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */
74#define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */
75#define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */
76#define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */
77#define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */
78
79/* ESP command register read-write */
80/* Group 1 commands: These may be sent at any point in time to the ESP
81 * chip. None of them can generate interrupts 'cept
82 * the "SCSI bus reset" command if you have not disabled
83 * SCSI reset interrupts in the config1 ESP register.
84 */
85#define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */
86#define ESP_CMD_FLUSH 0x01 /* FIFO Flush */
87#define ESP_CMD_RC 0x02 /* Chip reset */
88#define ESP_CMD_RS 0x03 /* SCSI bus reset */
89
90/* Group 2 commands: ESP must be an initiator and connected to a target
91 * for these commands to work.
92 */
93#define ESP_CMD_TI 0x10 /* Transfer Information */
94#define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */
95#define ESP_CMD_MOK 0x12 /* Message okie-dokie */
96#define ESP_CMD_TPAD 0x18 /* Transfer Pad */
97#define ESP_CMD_SATN 0x1a /* Set ATN */
98#define ESP_CMD_RATN 0x1b /* De-assert ATN */
99
100/* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected
101 * to a target as the initiator for these commands to work.
102 */
103#define ESP_CMD_SMSG 0x20 /* Send message */
104#define ESP_CMD_SSTAT 0x21 /* Send status */
105#define ESP_CMD_SDATA 0x22 /* Send data */
106#define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */
107#define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */
108#define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */
109#define ESP_CMD_DCNCT 0x27 /* Disconnect */
110#define ESP_CMD_RMSG 0x28 /* Receive Message */
111#define ESP_CMD_RCMD 0x29 /* Receive Command */
112#define ESP_CMD_RDATA 0x2a /* Receive Data */
113#define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */
114
115/* Group 4 commands: The ESP must be in the disconnected state and must
116 * not be connected to any targets as initiator for
117 * these commands to work.
118 */
119#define ESP_CMD_RSEL 0x40 /* Reselect */
120#define ESP_CMD_SEL 0x41 /* Select w/o ATN */
121#define ESP_CMD_SELA 0x42 /* Select w/ATN */
122#define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */
123#define ESP_CMD_ESEL 0x44 /* Enable selection */
124#define ESP_CMD_DSEL 0x45 /* Disable selections */
125#define ESP_CMD_SA3 0x46 /* Select w/ATN3 */
126#define ESP_CMD_RSEL3 0x47 /* Reselect3 */
127
128/* This bit enables the ESP's DMA on the SBus */
129#define ESP_CMD_DMA 0x80 /* Do DMA? */
130
131/* ESP status register read-only */
132#define ESP_STAT_PIO 0x01 /* IO phase bit */
133#define ESP_STAT_PCD 0x02 /* CD phase bit */
134#define ESP_STAT_PMSG 0x04 /* MSG phase bit */
135#define ESP_STAT_PMASK 0x07 /* Mask of phase bits */
136#define ESP_STAT_TDONE 0x08 /* Transfer Completed */
137#define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */
138#define ESP_STAT_PERR 0x20 /* Parity error */
139#define ESP_STAT_SPAM 0x40 /* Real bad error */
140/* This indicates the 'interrupt pending' condition on esp236, it is a reserved
141 * bit on other revs of the ESP.
142 */
143#define ESP_STAT_INTR 0x80 /* Interrupt */
144
145/* The status register can be masked with ESP_STAT_PMASK and compared
146 * with the following values to determine the current phase the ESP
147 * (at least thinks it) is in. For our purposes we also add our own
148 * software 'done' bit for our phase management engine.
149 */
150#define ESP_DOP (0) /* Data Out */
151#define ESP_DIP (ESP_STAT_PIO) /* Data In */
152#define ESP_CMDP (ESP_STAT_PCD) /* Command */
153#define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */
154#define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */
155#define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */
156
157/* HME only: status 2 register */
158#define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */
159#define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */
160#define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */
161#define ESP_STAT2_CREGA 0x08 /* The command reg is active now */
162#define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */
163#define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */
164#define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */
165#define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */
166
167/* ESP interrupt register read-only */
168#define ESP_INTR_S 0x01 /* Select w/o ATN */
169#define ESP_INTR_SATN 0x02 /* Select w/ATN */
170#define ESP_INTR_RSEL 0x04 /* Reselected */
171#define ESP_INTR_FDONE 0x08 /* Function done */
172#define ESP_INTR_BSERV 0x10 /* Bus service */
173#define ESP_INTR_DC 0x20 /* Disconnect */
174#define ESP_INTR_IC 0x40 /* Illegal command given */
175#define ESP_INTR_SR 0x80 /* SCSI bus reset detected */
176
177/* ESP sequence step register read-only */
178#define ESP_STEP_VBITS 0x07 /* Valid bits */
179#define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */
180#define ESP_STEP_SID 0x01 /* One msg byte sent */
181#define ESP_STEP_NCMD 0x02 /* Was not in command phase */
182#define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd
183 * bytes to be lost
184 */
185#define ESP_STEP_FINI4 0x04 /* Command was sent ok */
186
187/* Ho hum, some ESP's set the step register to this as well... */
188#define ESP_STEP_FINI5 0x05
189#define ESP_STEP_FINI6 0x06
190#define ESP_STEP_FINI7 0x07
191
192/* ESP chip-test register read-write */
193#define ESP_TEST_TARG 0x01 /* Target test mode */
194#define ESP_TEST_INI 0x02 /* Initiator test mode */
195#define ESP_TEST_TS 0x04 /* Tristate test mode */
196
197/* ESP unique ID register read-only, found on fas236+fas100a only */
198#define ESP_UID_F100A 0x00 /* ESP FAS100A */
199#define ESP_UID_F236 0x02 /* ESP FAS236 */
200#define ESP_UID_REV 0x07 /* ESP revision */
201#define ESP_UID_FAM 0xf8 /* ESP family */
202
203/* ESP fifo flags register read-only */
204/* Note that the following implies a 16 byte FIFO on the ESP. */
205#define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */
206#define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */
207#define ESP_FF_SSTEP 0xe0 /* Sequence step */
208
209/* ESP clock conversion factor register write-only */
210#define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */
211#define ESP_CCF_NEVER 0x01 /* Set it to this and die */
212#define ESP_CCF_F2 0x02 /* 10MHz */
213#define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */
214#define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */
215#define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */
216#define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */
217#define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */
218
219/* HME only... */
220#define ESP_BUSID_RESELID 0x10
221#define ESP_BUSID_CTR32BIT 0x40
222
223#define ESP_BUS_TIMEOUT 250 /* In milli-seconds */
224#define ESP_TIMEO_CONST 8192
225#define ESP_NEG_DEFP(mhz, cfact) \
226 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact)))
227#define ESP_MHZ_TO_CYCLE(mhertz) ((1000000000) / ((mhertz) / 1000))
228#define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000))
229
230/* For slow to medium speed input clock rates we shoot for 5mb/s, but for high
231 * input clock rates we try to do 10mb/s although I don't think a transfer can
232 * even run that fast with an ESP even with DMA2 scatter gather pipelining.
233 */
234#define SYNC_DEFP_SLOW 0x32 /* 5mb/s */
235#define SYNC_DEFP_FAST 0x19 /* 10mb/s */
236
237struct esp_cmd_priv {
238 union {
239 dma_addr_t dma_addr;
240 int num_sg;
241 } u;
242
243 unsigned int cur_residue;
244 struct scatterlist *cur_sg;
245 unsigned int tot_residue;
246};
247#define ESP_CMD_PRIV(CMD) ((struct esp_cmd_priv *)(&(CMD)->SCp))
248
249enum esp_rev {
250 ESP100 = 0x00, /* NCR53C90 - very broken */
251 ESP100A = 0x01, /* NCR53C90A */
252 ESP236 = 0x02,
253 FAS236 = 0x03,
254 FAS100A = 0x04,
255 FAST = 0x05,
256 FASHME = 0x06,
257};
258
259struct esp_cmd_entry {
260 struct list_head list;
261
262 struct scsi_cmnd *cmd;
263
264 unsigned int saved_cur_residue;
265 struct scatterlist *saved_cur_sg;
266 unsigned int saved_tot_residue;
267
268 u8 flags;
269#define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */
270#define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */
271#define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */
272
273 u8 tag[2];
274
275 u8 status;
276 u8 message;
277
278 unsigned char *sense_ptr;
279 unsigned char *saved_sense_ptr;
280 dma_addr_t sense_dma;
281
282 struct completion *eh_done;
283};
284
285/* XXX make this configurable somehow XXX */
286#define ESP_DEFAULT_TAGS 16
287
288#define ESP_MAX_TARGET 16
289#define ESP_MAX_LUN 8
290#define ESP_MAX_TAG 256
291
292struct esp_lun_data {
293 struct esp_cmd_entry *non_tagged_cmd;
294 int num_tagged;
295 int hold;
296 struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG];
297};
298
299struct esp_target_data {
300 /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which
301 * match the currently negotiated settings for this target. The SCSI
302 * protocol values are maintained in spi_{offset,period,wide}(starget).
303 */
304 u8 esp_period;
305 u8 esp_offset;
306 u8 esp_config3;
307
308 u8 flags;
309#define ESP_TGT_WIDE 0x01
310#define ESP_TGT_DISCONNECT 0x02
311#define ESP_TGT_NEGO_WIDE 0x04
312#define ESP_TGT_NEGO_SYNC 0x08
313#define ESP_TGT_CHECK_NEGO 0x40
314#define ESP_TGT_BROKEN 0x80
315
316 /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this
317 * device we will try to negotiate the following parameters.
318 */
319 u8 nego_goal_period;
320 u8 nego_goal_offset;
321 u8 nego_goal_width;
322 u8 nego_goal_tags;
323
324 struct scsi_target *starget;
325};
326
327struct esp_event_ent {
328 u8 type;
329#define ESP_EVENT_TYPE_EVENT 0x01
330#define ESP_EVENT_TYPE_CMD 0x02
331 u8 val;
332
333 u8 sreg;
334 u8 seqreg;
335 u8 sreg2;
336 u8 ireg;
337 u8 select_state;
338 u8 event;
339 u8 __pad;
340};
341
342struct esp;
343struct esp_driver_ops {
344 /* Read and write the ESP 8-bit registers. On some
345 * applications of the ESP chip the registers are at 4-byte
346 * instead of 1-byte intervals.
347 */
348 void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg);
349 u8 (*esp_read8)(struct esp *esp, unsigned long reg);
350
351 /* Map and unmap DMA memory. Eventually the driver will be
352 * converted to the generic DMA API as soon as SBUS is able to
353 * cope with that. At such time we can remove this.
354 */
355 dma_addr_t (*map_single)(struct esp *esp, void *buf,
356 size_t sz, int dir);
357 int (*map_sg)(struct esp *esp, struct scatterlist *sg,
358 int num_sg, int dir);
359 void (*unmap_single)(struct esp *esp, dma_addr_t addr,
360 size_t sz, int dir);
361 void (*unmap_sg)(struct esp *esp, struct scatterlist *sg,
362 int num_sg, int dir);
363
364 /* Return non-zero if there is an IRQ pending. Usually this
365 * status bit lives in the DMA controller sitting in front of
366 * the ESP. This has to be accurate or else the ESP interrupt
367 * handler will not run.
368 */
369 int (*irq_pending)(struct esp *esp);
370
371 /* Reset the DMA engine entirely. On return, ESP interrupts
372 * should be enabled. Often the interrupt enabling is
373 * controlled in the DMA engine.
374 */
375 void (*reset_dma)(struct esp *esp);
376
377 /* Drain any pending DMA in the DMA engine after a transfer.
378 * This is for writes to memory.
379 */
380 void (*dma_drain)(struct esp *esp);
381
382 /* Invalidate the DMA engine after a DMA transfer. */
383 void (*dma_invalidate)(struct esp *esp);
384
385 /* Setup an ESP command that will use a DMA transfer.
386 * The 'esp_count' specifies what transfer length should be
387 * programmed into the ESP transfer counter registers, whereas
388 * the 'dma_count' is the length that should be programmed into
389 * the DMA controller. Usually they are the same. If 'write'
390 * is non-zero, this transfer is a write into memory. 'cmd'
391 * holds the ESP command that should be issued by calling
392 * scsi_esp_cmd() at the appropriate time while programming
393 * the DMA hardware.
394 */
395 void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count,
396 u32 dma_count, int write, u8 cmd);
397
398 /* Return non-zero if the DMA engine is reporting an error
399 * currently.
400 */
401 int (*dma_error)(struct esp *esp);
402};
403
404#define ESP_MAX_MSG_SZ 8
405#define ESP_EVENT_LOG_SZ 32
406
407#define ESP_QUICKIRQ_LIMIT 100
408#define ESP_RESELECT_TAG_LIMIT 2500
409
410struct esp {
411 void __iomem *regs;
412 void __iomem *dma_regs;
413
414 const struct esp_driver_ops *ops;
415
416 struct Scsi_Host *host;
417 void *dev;
418
419 struct esp_cmd_entry *active_cmd;
420
421 struct list_head queued_cmds;
422 struct list_head active_cmds;
423
424 u8 *command_block;
425 dma_addr_t command_block_dma;
426
427 unsigned int data_dma_len;
428
429 /* The following are used to determine the cause of an IRQ. Upon every
430 * IRQ entry we synchronize these with the hardware registers.
431 */
432 u8 sreg;
433 u8 seqreg;
434 u8 sreg2;
435 u8 ireg;
436
437 u32 prev_hme_dmacsr;
438 u8 prev_soff;
439 u8 prev_stp;
440 u8 prev_cfg3;
441 u8 __pad;
442
443 struct list_head esp_cmd_pool;
444
445 struct esp_target_data target[ESP_MAX_TARGET];
446
447 int fifo_cnt;
448 u8 fifo[16];
449
450 struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ];
451 int esp_event_cur;
452
453 u8 msg_out[ESP_MAX_MSG_SZ];
454 int msg_out_len;
455
456 u8 msg_in[ESP_MAX_MSG_SZ];
457 int msg_in_len;
458
459 u8 bursts;
460 u8 config1;
461 u8 config2;
462
463 u8 scsi_id;
464 u32 scsi_id_mask;
465
466 enum esp_rev rev;
467
468 u32 flags;
469#define ESP_FLAG_DIFFERENTIAL 0x00000001
470#define ESP_FLAG_RESETTING 0x00000002
471#define ESP_FLAG_DOING_SLOWCMD 0x00000004
472#define ESP_FLAG_WIDE_CAPABLE 0x00000008
473#define ESP_FLAG_QUICKIRQ_CHECK 0x00000010
474
475 u8 select_state;
476#define ESP_SELECT_NONE 0x00 /* Not selecting */
477#define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */
478#define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */
479
480 /* When we are not selecting, we are expecting an event. */
481 u8 event;
482#define ESP_EVENT_NONE 0x00
483#define ESP_EVENT_CMD_START 0x01
484#define ESP_EVENT_CMD_DONE 0x02
485#define ESP_EVENT_DATA_IN 0x03
486#define ESP_EVENT_DATA_OUT 0x04
487#define ESP_EVENT_DATA_DONE 0x05
488#define ESP_EVENT_MSGIN 0x06
489#define ESP_EVENT_MSGIN_MORE 0x07
490#define ESP_EVENT_MSGIN_DONE 0x08
491#define ESP_EVENT_MSGOUT 0x09
492#define ESP_EVENT_MSGOUT_DONE 0x0a
493#define ESP_EVENT_STATUS 0x0b
494#define ESP_EVENT_FREE_BUS 0x0c
495#define ESP_EVENT_CHECK_PHASE 0x0d
496#define ESP_EVENT_RESET 0x10
497
498 /* Probed in esp_get_clock_params() */
499 u32 cfact;
500 u32 cfreq;
501 u32 ccycle;
502 u32 ctick;
503 u32 neg_defp;
504 u32 sync_defp;
505
506 /* Computed in esp_reset_esp() */
507 u32 max_period;
508 u32 min_period;
509 u32 radelay;
510
511 /* Slow command state. */
512 u8 *cmd_bytes_ptr;
513 int cmd_bytes_left;
514
515 struct completion *eh_reset;
516
517 struct sbus_dma *dma;
518};
519
520#define host_to_esp(host) ((struct esp *)(host)->hostdata)
521
522/* A front-end driver for the ESP chip should do the following in
523 * it's device probe routine:
524 * 1) Allocate the host and private area using scsi_host_alloc()
525 * with size 'sizeof(struct esp)'. The first argument to
526 * scsi_host_alloc() should be &scsi_esp_template.
527 * 2) Set host->max_id as appropriate.
528 * 3) Set esp->host to the scsi_host itself, and esp->dev
529 * to the device object pointer.
530 * 4) Hook up esp->ops to the front-end implementation.
531 * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE
532 * in esp->flags.
533 * 6) Map the DMA and ESP chip registers.
534 * 7) DMA map the ESP command block, store the DMA address
535 * in esp->command_block_dma.
536 * 8) Register the scsi_esp_intr() interrupt handler.
537 * 9) Probe for and provide the following chip properties:
538 * esp->scsi_id (assign to esp->host->this_id too)
539 * esp->scsi_id_mask
540 * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL
541 * esp->cfreq
542 * DMA burst bit mask in esp->bursts, if necessary
543 * 10) Perform any actions necessary before the ESP device can
544 * be programmed for the first time. On some configs, for
545 * example, the DMA engine has to be reset before ESP can
546 * be programmed.
547 * 11) If necessary, call dev_set_drvdata() as needed.
548 * 12) Call scsi_esp_register() with prepared 'esp' structure
549 * and a device pointer if possible.
550 * 13) Check scsi_esp_register() return value, release all resources
551 * if an error was returned.
552 */
553extern struct scsi_host_template scsi_esp_template;
554extern int scsi_esp_register(struct esp *, struct device *);
555
556extern void scsi_esp_unregister(struct esp *);
557extern irqreturn_t scsi_esp_intr(int, void *);
558extern void scsi_esp_cmd(struct esp *, u8);
559
560#endif /* !(_ESP_SCSI_H) */
diff --git a/drivers/scsi/sun_esp.c b/drivers/scsi/sun_esp.c
new file mode 100644
index 00000000000..8c766bcd109
--- /dev/null
+++ b/drivers/scsi/sun_esp.c
@@ -0,0 +1,634 @@
1/* sun_esp.c: ESP front-end for Sparc SBUS systems.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6#include <linux/kernel.h>
7#include <linux/types.h>
8#include <linux/module.h>
9#include <linux/init.h>
10
11#include <asm/irq.h>
12#include <asm/io.h>
13#include <asm/dma.h>
14
15#include <asm/sbus.h>
16
17#include <scsi/scsi_host.h>
18
19#include "esp_scsi.h"
20
21#define DRV_MODULE_NAME "sun_esp"
22#define PFX DRV_MODULE_NAME ": "
23#define DRV_VERSION "1.000"
24#define DRV_MODULE_RELDATE "April 19, 2007"
25
26#define dma_read32(REG) \
27 sbus_readl(esp->dma_regs + (REG))
28#define dma_write32(VAL, REG) \
29 sbus_writel((VAL), esp->dma_regs + (REG))
30
31static int __devinit esp_sbus_find_dma(struct esp *esp, struct sbus_dev *dma_sdev)
32{
33 struct sbus_dev *sdev = esp->dev;
34 struct sbus_dma *dma;
35
36 if (dma_sdev != NULL) {
37 for_each_dvma(dma) {
38 if (dma->sdev == dma_sdev)
39 break;
40 }
41 } else {
42 for_each_dvma(dma) {
43 if (dma->sdev == NULL)
44 break;
45
46 /* If bus + slot are the same and it has the
47 * correct OBP name, it's ours.
48 */
49 if (sdev->bus == dma->sdev->bus &&
50 sdev->slot == dma->sdev->slot &&
51 (!strcmp(dma->sdev->prom_name, "dma") ||
52 !strcmp(dma->sdev->prom_name, "espdma")))
53 break;
54 }
55 }
56
57 if (dma == NULL) {
58 printk(KERN_ERR PFX "[%s] Cannot find dma.\n",
59 sdev->ofdev.node->full_name);
60 return -ENODEV;
61 }
62 esp->dma = dma;
63 esp->dma_regs = dma->regs;
64
65 return 0;
66
67}
68
69static int __devinit esp_sbus_map_regs(struct esp *esp, int hme)
70{
71 struct sbus_dev *sdev = esp->dev;
72 struct resource *res;
73
74 /* On HME, two reg sets exist, first is DVMA,
75 * second is ESP registers.
76 */
77 if (hme)
78 res = &sdev->resource[1];
79 else
80 res = &sdev->resource[0];
81
82 esp->regs = sbus_ioremap(res, 0, SBUS_ESP_REG_SIZE, "ESP");
83 if (!esp->regs)
84 return -ENOMEM;
85
86 return 0;
87}
88
89static int __devinit esp_sbus_map_command_block(struct esp *esp)
90{
91 struct sbus_dev *sdev = esp->dev;
92
93 esp->command_block = sbus_alloc_consistent(sdev, 16,
94 &esp->command_block_dma);
95 if (!esp->command_block)
96 return -ENOMEM;
97 return 0;
98}
99
100static int __devinit esp_sbus_register_irq(struct esp *esp)
101{
102 struct Scsi_Host *host = esp->host;
103 struct sbus_dev *sdev = esp->dev;
104
105 host->irq = sdev->irqs[0];
106 return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
107}
108
109static void __devinit esp_get_scsi_id(struct esp *esp)
110{
111 struct sbus_dev *sdev = esp->dev;
112 struct device_node *dp = sdev->ofdev.node;
113
114 esp->scsi_id = of_getintprop_default(dp, "initiator-id", 0xff);
115 if (esp->scsi_id != 0xff)
116 goto done;
117
118 esp->scsi_id = of_getintprop_default(dp, "scsi-initiator-id", 0xff);
119 if (esp->scsi_id != 0xff)
120 goto done;
121
122 if (!sdev->bus) {
123 /* SUN4 */
124 esp->scsi_id = 7;
125 goto done;
126 }
127
128 esp->scsi_id = of_getintprop_default(sdev->bus->ofdev.node,
129 "scsi-initiator-id", 7);
130
131done:
132 esp->host->this_id = esp->scsi_id;
133 esp->scsi_id_mask = (1 << esp->scsi_id);
134}
135
136static void __devinit esp_get_differential(struct esp *esp)
137{
138 struct sbus_dev *sdev = esp->dev;
139 struct device_node *dp = sdev->ofdev.node;
140
141 if (of_find_property(dp, "differential", NULL))
142 esp->flags |= ESP_FLAG_DIFFERENTIAL;
143 else
144 esp->flags &= ~ESP_FLAG_DIFFERENTIAL;
145}
146
147static void __devinit esp_get_clock_params(struct esp *esp)
148{
149 struct sbus_dev *sdev = esp->dev;
150 struct device_node *dp = sdev->ofdev.node;
151 struct device_node *bus_dp;
152 int fmhz;
153
154 bus_dp = NULL;
155 if (sdev != NULL && sdev->bus != NULL)
156 bus_dp = sdev->bus->ofdev.node;
157
158 fmhz = of_getintprop_default(dp, "clock-frequency", 0);
159 if (fmhz == 0)
160 fmhz = (!bus_dp) ? 0 :
161 of_getintprop_default(bus_dp, "clock-frequency", 0);
162
163 esp->cfreq = fmhz;
164}
165
166static void __devinit esp_get_bursts(struct esp *esp, struct sbus_dev *dma)
167{
168 struct sbus_dev *sdev = esp->dev;
169 struct device_node *dp = sdev->ofdev.node;
170 u8 bursts;
171
172 bursts = of_getintprop_default(dp, "burst-sizes", 0xff);
173 if (dma) {
174 struct device_node *dma_dp = dma->ofdev.node;
175 u8 val = of_getintprop_default(dma_dp, "burst-sizes", 0xff);
176 if (val != 0xff)
177 bursts &= val;
178 }
179
180 if (sdev->bus) {
181 u8 val = of_getintprop_default(sdev->bus->ofdev.node,
182 "burst-sizes", 0xff);
183 if (val != 0xff)
184 bursts &= val;
185 }
186
187 if (bursts == 0xff ||
188 (bursts & DMA_BURST16) == 0 ||
189 (bursts & DMA_BURST32) == 0)
190 bursts = (DMA_BURST32 - 1);
191
192 esp->bursts = bursts;
193}
194
195static void __devinit esp_sbus_get_props(struct esp *esp, struct sbus_dev *espdma)
196{
197 esp_get_scsi_id(esp);
198 esp_get_differential(esp);
199 esp_get_clock_params(esp);
200 esp_get_bursts(esp, espdma);
201}
202
203static void sbus_esp_write8(struct esp *esp, u8 val, unsigned long reg)
204{
205 sbus_writeb(val, esp->regs + (reg * 4UL));
206}
207
208static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
209{
210 return sbus_readb(esp->regs + (reg * 4UL));
211}
212
213static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
214 size_t sz, int dir)
215{
216 return sbus_map_single(esp->dev, buf, sz, dir);
217}
218
219static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
220 int num_sg, int dir)
221{
222 return sbus_map_sg(esp->dev, sg, num_sg, dir);
223}
224
225static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
226 size_t sz, int dir)
227{
228 sbus_unmap_single(esp->dev, addr, sz, dir);
229}
230
231static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
232 int num_sg, int dir)
233{
234 sbus_unmap_sg(esp->dev, sg, num_sg, dir);
235}
236
237static int sbus_esp_irq_pending(struct esp *esp)
238{
239 if (dma_read32(DMA_CSR) & (DMA_HNDL_INTR | DMA_HNDL_ERROR))
240 return 1;
241 return 0;
242}
243
244static void sbus_esp_reset_dma(struct esp *esp)
245{
246 int can_do_burst16, can_do_burst32, can_do_burst64;
247 int can_do_sbus64, lim;
248 u32 val;
249
250 can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
251 can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
252 can_do_burst64 = 0;
253 can_do_sbus64 = 0;
254 if (sbus_can_dma_64bit(esp->dev))
255 can_do_sbus64 = 1;
256 if (sbus_can_burst64(esp->sdev))
257 can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
258
259 /* Put the DVMA into a known state. */
260 if (esp->dma->revision != dvmahme) {
261 val = dma_read32(DMA_CSR);
262 dma_write32(val | DMA_RST_SCSI, DMA_CSR);
263 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
264 }
265 switch (esp->dma->revision) {
266 case dvmahme:
267 dma_write32(DMA_RESET_FAS366, DMA_CSR);
268 dma_write32(DMA_RST_SCSI, DMA_CSR);
269
270 esp->prev_hme_dmacsr = (DMA_PARITY_OFF | DMA_2CLKS |
271 DMA_SCSI_DISAB | DMA_INT_ENAB);
272
273 esp->prev_hme_dmacsr &= ~(DMA_ENABLE | DMA_ST_WRITE |
274 DMA_BRST_SZ);
275
276 if (can_do_burst64)
277 esp->prev_hme_dmacsr |= DMA_BRST64;
278 else if (can_do_burst32)
279 esp->prev_hme_dmacsr |= DMA_BRST32;
280
281 if (can_do_sbus64) {
282 esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
283 sbus_set_sbus64(esp->dev, esp->bursts);
284 }
285
286 lim = 1000;
287 while (dma_read32(DMA_CSR) & DMA_PEND_READ) {
288 if (--lim == 0) {
289 printk(KERN_ALERT PFX "esp%d: DMA_PEND_READ "
290 "will not clear!\n",
291 esp->host->unique_id);
292 break;
293 }
294 udelay(1);
295 }
296
297 dma_write32(0, DMA_CSR);
298 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
299
300 dma_write32(0, DMA_ADDR);
301 break;
302
303 case dvmarev2:
304 if (esp->rev != ESP100) {
305 val = dma_read32(DMA_CSR);
306 dma_write32(val | DMA_3CLKS, DMA_CSR);
307 }
308 break;
309
310 case dvmarev3:
311 val = dma_read32(DMA_CSR);
312 val &= ~DMA_3CLKS;
313 val |= DMA_2CLKS;
314 if (can_do_burst32) {
315 val &= ~DMA_BRST_SZ;
316 val |= DMA_BRST32;
317 }
318 dma_write32(val, DMA_CSR);
319 break;
320
321 case dvmaesc1:
322 val = dma_read32(DMA_CSR);
323 val |= DMA_ADD_ENABLE;
324 val &= ~DMA_BCNT_ENAB;
325 if (!can_do_burst32 && can_do_burst16) {
326 val |= DMA_ESC_BURST;
327 } else {
328 val &= ~(DMA_ESC_BURST);
329 }
330 dma_write32(val, DMA_CSR);
331 break;
332
333 default:
334 break;
335 }
336
337 /* Enable interrupts. */
338 val = dma_read32(DMA_CSR);
339 dma_write32(val | DMA_INT_ENAB, DMA_CSR);
340}
341
342static void sbus_esp_dma_drain(struct esp *esp)
343{
344 u32 csr;
345 int lim;
346
347 if (esp->dma->revision == dvmahme)
348 return;
349
350 csr = dma_read32(DMA_CSR);
351 if (!(csr & DMA_FIFO_ISDRAIN))
352 return;
353
354 if (esp->dma->revision != dvmarev3 && esp->dma->revision != dvmaesc1)
355 dma_write32(csr | DMA_FIFO_STDRAIN, DMA_CSR);
356
357 lim = 1000;
358 while (dma_read32(DMA_CSR) & DMA_FIFO_ISDRAIN) {
359 if (--lim == 0) {
360 printk(KERN_ALERT PFX "esp%d: DMA will not drain!\n",
361 esp->host->unique_id);
362 break;
363 }
364 udelay(1);
365 }
366}
367
368static void sbus_esp_dma_invalidate(struct esp *esp)
369{
370 if (esp->dma->revision == dvmahme) {
371 dma_write32(DMA_RST_SCSI, DMA_CSR);
372
373 esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
374 (DMA_PARITY_OFF | DMA_2CLKS |
375 DMA_SCSI_DISAB | DMA_INT_ENAB)) &
376 ~(DMA_ST_WRITE | DMA_ENABLE));
377
378 dma_write32(0, DMA_CSR);
379 dma_write32(esp->prev_hme_dmacsr, DMA_CSR);
380
381 /* This is necessary to avoid having the SCSI channel
382 * engine lock up on us.
383 */
384 dma_write32(0, DMA_ADDR);
385 } else {
386 u32 val;
387 int lim;
388
389 lim = 1000;
390 while ((val = dma_read32(DMA_CSR)) & DMA_PEND_READ) {
391 if (--lim == 0) {
392 printk(KERN_ALERT PFX "esp%d: DMA will not "
393 "invalidate!\n", esp->host->unique_id);
394 break;
395 }
396 udelay(1);
397 }
398
399 val &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
400 val |= DMA_FIFO_INV;
401 dma_write32(val, DMA_CSR);
402 val &= ~DMA_FIFO_INV;
403 dma_write32(val, DMA_CSR);
404 }
405}
406
407static void sbus_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
408 u32 dma_count, int write, u8 cmd)
409{
410 u32 csr;
411
412 BUG_ON(!(cmd & ESP_CMD_DMA));
413
414 sbus_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
415 sbus_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
416 if (esp->rev == FASHME) {
417 sbus_esp_write8(esp, (esp_count >> 16) & 0xff, FAS_RLO);
418 sbus_esp_write8(esp, 0, FAS_RHI);
419
420 scsi_esp_cmd(esp, cmd);
421
422 csr = esp->prev_hme_dmacsr;
423 csr |= DMA_SCSI_DISAB | DMA_ENABLE;
424 if (write)
425 csr |= DMA_ST_WRITE;
426 else
427 csr &= ~DMA_ST_WRITE;
428 esp->prev_hme_dmacsr = csr;
429
430 dma_write32(dma_count, DMA_COUNT);
431 dma_write32(addr, DMA_ADDR);
432 dma_write32(csr, DMA_CSR);
433 } else {
434 csr = dma_read32(DMA_CSR);
435 csr |= DMA_ENABLE;
436 if (write)
437 csr |= DMA_ST_WRITE;
438 else
439 csr &= ~DMA_ST_WRITE;
440 dma_write32(csr, DMA_CSR);
441 if (esp->dma->revision == dvmaesc1) {
442 u32 end = PAGE_ALIGN(addr + dma_count + 16U);
443 dma_write32(end - addr, DMA_COUNT);
444 }
445 dma_write32(addr, DMA_ADDR);
446
447 scsi_esp_cmd(esp, cmd);
448 }
449
450}
451
452static int sbus_esp_dma_error(struct esp *esp)
453{
454 u32 csr = dma_read32(DMA_CSR);
455
456 if (csr & DMA_HNDL_ERROR)
457 return 1;
458
459 return 0;
460}
461
462static const struct esp_driver_ops sbus_esp_ops = {
463 .esp_write8 = sbus_esp_write8,
464 .esp_read8 = sbus_esp_read8,
465 .map_single = sbus_esp_map_single,
466 .map_sg = sbus_esp_map_sg,
467 .unmap_single = sbus_esp_unmap_single,
468 .unmap_sg = sbus_esp_unmap_sg,
469 .irq_pending = sbus_esp_irq_pending,
470 .reset_dma = sbus_esp_reset_dma,
471 .dma_drain = sbus_esp_dma_drain,
472 .dma_invalidate = sbus_esp_dma_invalidate,
473 .send_dma_cmd = sbus_esp_send_dma_cmd,
474 .dma_error = sbus_esp_dma_error,
475};
476
477static int __devinit esp_sbus_probe_one(struct device *dev,
478 struct sbus_dev *esp_dev,
479 struct sbus_dev *espdma,
480 struct sbus_bus *sbus,
481 int hme)
482{
483 struct scsi_host_template *tpnt = &scsi_esp_template;
484 struct Scsi_Host *host;
485 struct esp *esp;
486 int err;
487
488 host = scsi_host_alloc(tpnt, sizeof(struct esp));
489
490 err = -ENOMEM;
491 if (!host)
492 goto fail;
493
494 host->max_id = (hme ? 16 : 8);
495 esp = host_to_esp(host);
496
497 esp->host = host;
498 esp->dev = esp_dev;
499 esp->ops = &sbus_esp_ops;
500
501 if (hme)
502 esp->flags |= ESP_FLAG_WIDE_CAPABLE;
503
504 err = esp_sbus_find_dma(esp, espdma);
505 if (err < 0)
506 goto fail_unlink;
507
508 err = esp_sbus_map_regs(esp, hme);
509 if (err < 0)
510 goto fail_unlink;
511
512 err = esp_sbus_map_command_block(esp);
513 if (err < 0)
514 goto fail_unmap_regs;
515
516 err = esp_sbus_register_irq(esp);
517 if (err < 0)
518 goto fail_unmap_command_block;
519
520 esp_sbus_get_props(esp, espdma);
521
522 /* Before we try to touch the ESP chip, ESC1 dma can
523 * come up with the reset bit set, so make sure that
524 * is clear first.
525 */
526 if (esp->dma->revision == dvmaesc1) {
527 u32 val = dma_read32(DMA_CSR);
528
529 dma_write32(val & ~DMA_RST_SCSI, DMA_CSR);
530 }
531
532 dev_set_drvdata(&esp_dev->ofdev.dev, esp);
533
534 err = scsi_esp_register(esp, dev);
535 if (err)
536 goto fail_free_irq;
537
538 return 0;
539
540fail_free_irq:
541 free_irq(host->irq, esp);
542fail_unmap_command_block:
543 sbus_free_consistent(esp->dev, 16,
544 esp->command_block,
545 esp->command_block_dma);
546fail_unmap_regs:
547 sbus_iounmap(esp->regs, SBUS_ESP_REG_SIZE);
548fail_unlink:
549 scsi_host_put(host);
550fail:
551 return err;
552}
553
554static int __devinit esp_sbus_probe(struct of_device *dev, const struct of_device_id *match)
555{
556 struct sbus_dev *sdev = to_sbus_device(&dev->dev);
557 struct device_node *dp = dev->node;
558 struct sbus_dev *dma_sdev = NULL;
559 int hme = 0;
560
561 if (dp->parent &&
562 (!strcmp(dp->parent->name, "espdma") ||
563 !strcmp(dp->parent->name, "dma")))
564 dma_sdev = sdev->parent;
565 else if (!strcmp(dp->name, "SUNW,fas")) {
566 dma_sdev = sdev;
567 hme = 1;
568 }
569
570 return esp_sbus_probe_one(&dev->dev, sdev, dma_sdev,
571 sdev->bus, hme);
572}
573
574static int __devexit esp_sbus_remove(struct of_device *dev)
575{
576 struct esp *esp = dev_get_drvdata(&dev->dev);
577 unsigned int irq = esp->host->irq;
578 u32 val;
579
580 scsi_esp_unregister(esp);
581
582 /* Disable interrupts. */
583 val = dma_read32(DMA_CSR);
584 dma_write32(val & ~DMA_INT_ENAB, DMA_CSR);
585
586 free_irq(irq, esp);
587 sbus_free_consistent(esp->dev, 16,
588 esp->command_block,
589 esp->command_block_dma);
590 sbus_iounmap(esp->regs, SBUS_ESP_REG_SIZE);
591
592 scsi_host_put(esp->host);
593
594 return 0;
595}
596
597static struct of_device_id esp_match[] = {
598 {
599 .name = "SUNW,esp",
600 },
601 {
602 .name = "SUNW,fas",
603 },
604 {
605 .name = "esp",
606 },
607 {},
608};
609MODULE_DEVICE_TABLE(of, esp_match);
610
611static struct of_platform_driver esp_sbus_driver = {
612 .name = "esp",
613 .match_table = esp_match,
614 .probe = esp_sbus_probe,
615 .remove = __devexit_p(esp_sbus_remove),
616};
617
618static int __init sunesp_init(void)
619{
620 return of_register_driver(&esp_sbus_driver, &sbus_bus_type);
621}
622
623static void __exit sunesp_exit(void)
624{
625 of_unregister_driver(&esp_sbus_driver);
626}
627
628MODULE_DESCRIPTION("Sun ESP SCSI driver");
629MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
630MODULE_LICENSE("GPL");
631MODULE_VERSION(DRV_VERSION);
632
633module_init(sunesp_init);
634module_exit(sunesp_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-18 00:38:43 -0400