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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/53c7xx.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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diff --git a/drivers/scsi/53c7xx.c b/drivers/scsi/53c7xx.c
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1/*
2 * 53c710 driver. Modified from Drew Eckhardts driver
3 * for 53c810 by Richard Hirst [richard@sleepie.demon.co.uk]
4 * Check out PERM_OPTIONS and EXPECTED_CLOCK, which may be defined in the
5 * relevant machine specific file (eg. mvme16x.[ch], amiga7xx.[ch]).
6 * There are also currently some defines at the top of 53c7xx.scr.
7 * The chip type is #defined in script_asm.pl, as well as the Makefile.
8 * Host scsi ID expected to be 7 - see NCR53c7x0_init().
9 *
10 * I have removed the PCI code and some of the 53c8xx specific code -
11 * simply to make this file smaller and easier to manage.
12 *
13 * MVME16x issues:
14 * Problems trying to read any chip registers in NCR53c7x0_init(), as they
15 * may never have been set by 16xBug (eg. If kernel has come in over tftp).
16 */
17
18/*
19 * Adapted for Linux/m68k Amiga platforms for the A4000T/A4091 and
20 * WarpEngine SCSI controllers.
21 * By Alan Hourihane <alanh@fairlite.demon.co.uk>
22 * Thanks to Richard Hirst for making it possible with the MVME additions
23 */
24
25/*
26 * 53c710 rev 0 doesn't support add with carry. Rev 1 and 2 does. To
27 * overcome this problem you can define FORCE_DSA_ALIGNMENT, which ensures
28 * that the DSA address is always xxxxxx00. If disconnection is not allowed,
29 * then the script only ever tries to add small (< 256) positive offsets to
30 * DSA, so lack of carry isn't a problem. FORCE_DSA_ALIGNMENT can, of course,
31 * be defined for all chip revisions at a small cost in memory usage.
32 */
33
34#define FORCE_DSA_ALIGNMENT
35
36/*
37 * Selection timer does not always work on the 53c710, depending on the
38 * timing at the last disconnect, if this is a problem for you, try
39 * using validids as detailed below.
40 *
41 * Options for the NCR7xx driver
42 *
43 * noasync:0 - disables sync and asynchronous negotiation
44 * nosync:0 - disables synchronous negotiation (does async)
45 * nodisconnect:0 - disables disconnection
46 * validids:0x?? - Bitmask field that disallows certain ID's.
47 * - e.g. 0x03 allows ID 0,1
48 * - 0x1F allows ID 0,1,2,3,4
49 * opthi:n - replace top word of options with 'n'
50 * optlo:n - replace bottom word of options with 'n'
51 * - ALWAYS SPECIFY opthi THEN optlo <<<<<<<<<<
52 */
53
54/*
55 * PERM_OPTIONS are driver options which will be enabled for all NCR boards
56 * in the system at driver initialization time.
57 *
58 * Don't THINK about touching these in PERM_OPTIONS :
59 * OPTION_MEMORY_MAPPED
60 * 680x0 doesn't have an IO map!
61 *
62 * OPTION_DEBUG_TEST1
63 * Test 1 does bus mastering and interrupt tests, which will help weed
64 * out brain damaged main boards.
65 *
66 * Other PERM_OPTIONS settings are listed below. Note the actual options
67 * required are set in the relevant file (mvme16x.c, amiga7xx.c, etc):
68 *
69 * OPTION_NO_ASYNC
70 * Don't negotiate for asynchronous transfers on the first command
71 * when OPTION_ALWAYS_SYNCHRONOUS is set. Useful for dain bramaged
72 * devices which do something bad rather than sending a MESSAGE
73 * REJECT back to us like they should if they can't cope.
74 *
75 * OPTION_SYNCHRONOUS
76 * Enable support for synchronous transfers. Target negotiated
77 * synchronous transfers will be responded to. To initiate
78 * a synchronous transfer request, call
79 *
80 * request_synchronous (hostno, target)
81 *
82 * from within KGDB.
83 *
84 * OPTION_ALWAYS_SYNCHRONOUS
85 * Negotiate for synchronous transfers with every target after
86 * driver initialization or a SCSI bus reset. This is a bit dangerous,
87 * since there are some dain bramaged SCSI devices which will accept
88 * SDTR messages but keep talking asynchronously.
89 *
90 * OPTION_DISCONNECT
91 * Enable support for disconnect/reconnect. To change the
92 * default setting on a given host adapter, call
93 *
94 * request_disconnect (hostno, allow)
95 *
96 * where allow is non-zero to allow, 0 to disallow.
97 *
98 * If you really want to run 10MHz FAST SCSI-II transfers, you should
99 * know that the NCR driver currently ignores parity information. Most
100 * systems do 5MHz SCSI fine. I've seen a lot that have problems faster
101 * than 8MHz. To play it safe, we only request 5MHz transfers.
102 *
103 * If you'd rather get 10MHz transfers, edit sdtr_message and change
104 * the fourth byte from 50 to 25.
105 */
106
107/*
108 * Sponsored by
109 * iX Multiuser Multitasking Magazine
110 * Hannover, Germany
111 * hm@ix.de
112 *
113 * Copyright 1993, 1994, 1995 Drew Eckhardt
114 * Visionary Computing
115 * (Unix and Linux consulting and custom programming)
116 * drew@PoohSticks.ORG
117 * +1 (303) 786-7975
118 *
119 * TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
120 *
121 * For more information, please consult
122 *
123 * NCR53C810
124 * SCSI I/O Processor
125 * Programmer's Guide
126 *
127 * NCR 53C810
128 * PCI-SCSI I/O Processor
129 * Data Manual
130 *
131 * NCR 53C810/53C820
132 * PCI-SCSI I/O Processor Design In Guide
133 *
134 * For literature on Symbios Logic Inc. formerly NCR, SCSI,
135 * and Communication products please call (800) 334-5454 or
136 * (719) 536-3300.
137 *
138 * PCI BIOS Specification Revision
139 * PCI Local Bus Specification
140 * PCI System Design Guide
141 *
142 * PCI Special Interest Group
143 * M/S HF3-15A
144 * 5200 N.E. Elam Young Parkway
145 * Hillsboro, Oregon 97124-6497
146 * +1 (503) 696-2000
147 * +1 (800) 433-5177
148 */
149
150/*
151 * Design issues :
152 * The cumulative latency needed to propagate a read/write request
153 * through the file system, buffer cache, driver stacks, SCSI host, and
154 * SCSI device is ultimately the limiting factor in throughput once we
155 * have a sufficiently fast host adapter.
156 *
157 * So, to maximize performance we want to keep the ratio of latency to data
158 * transfer time to a minimum by
159 * 1. Minimizing the total number of commands sent (typical command latency
160 * including drive and bus mastering host overhead is as high as 4.5ms)
161 * to transfer a given amount of data.
162 *
163 * This is accomplished by placing no arbitrary limit on the number
164 * of scatter/gather buffers supported, since we can transfer 1K
165 * per scatter/gather buffer without Eric's cluster patches,
166 * 4K with.
167 *
168 * 2. Minimizing the number of fatal interrupts serviced, since
169 * fatal interrupts halt the SCSI I/O processor. Basically,
170 * this means offloading the practical maximum amount of processing
171 * to the SCSI chip.
172 *
173 * On the NCR53c810/820/720, this is accomplished by using
174 * interrupt-on-the-fly signals when commands complete,
175 * and only handling fatal errors and SDTR / WDTR messages
176 * in the host code.
177 *
178 * On the NCR53c710, interrupts are generated as on the NCR53c8x0,
179 * only the lack of a interrupt-on-the-fly facility complicates
180 * things. Also, SCSI ID registers and commands are
181 * bit fielded rather than binary encoded.
182 *
183 * On the NCR53c700 and NCR53c700-66, operations that are done via
184 * indirect, table mode on the more advanced chips must be
185 * replaced by calls through a jump table which
186 * acts as a surrogate for the DSA. Unfortunately, this
187 * will mean that we must service an interrupt for each
188 * disconnect/reconnect.
189 *
190 * 3. Eliminating latency by pipelining operations at the different levels.
191 *
192 * This driver allows a configurable number of commands to be enqueued
193 * for each target/lun combination (experimentally, I have discovered
194 * that two seems to work best) and will ultimately allow for
195 * SCSI-II tagged queuing.
196 *
197 *
198 * Architecture :
199 * This driver is built around a Linux queue of commands waiting to
200 * be executed, and a shared Linux/NCR array of commands to start. Commands
201 * are transferred to the array by the run_process_issue_queue() function
202 * which is called whenever a command completes.
203 *
204 * As commands are completed, the interrupt routine is triggered,
205 * looks for commands in the linked list of completed commands with
206 * valid status, removes these commands from a list of running commands,
207 * calls the done routine, and flags their target/luns as not busy.
208 *
209 * Due to limitations in the intelligence of the NCR chips, certain
210 * concessions are made. In many cases, it is easier to dynamically
211 * generate/fix-up code rather than calculate on the NCR at run time.
212 * So, code is generated or fixed up for
213 *
214 * - Handling data transfers, using a variable number of MOVE instructions
215 * interspersed with CALL MSG_IN, WHEN MSGIN instructions.
216 *
217 * The DATAIN and DATAOUT routines are separate, so that an incorrect
218 * direction can be trapped, and space isn't wasted.
219 *
220 * It may turn out that we're better off using some sort
221 * of table indirect instruction in a loop with a variable
222 * sized table on the NCR53c710 and newer chips.
223 *
224 * - Checking for reselection (NCR53c710 and better)
225 *
226 * - Handling the details of SCSI context switches (NCR53c710 and better),
227 * such as reprogramming appropriate synchronous parameters,
228 * removing the dsa structure from the NCR's queue of outstanding
229 * commands, etc.
230 *
231 */
232
233#include <linux/module.h>
234
235#include <linux/config.h>
236
237#include <linux/types.h>
238#include <asm/setup.h>
239#include <asm/dma.h>
240#include <asm/io.h>
241#include <asm/system.h>
242#include <linux/delay.h>
243#include <linux/signal.h>
244#include <linux/sched.h>
245#include <linux/errno.h>
246#include <linux/string.h>
247#include <linux/slab.h>
248#include <linux/vmalloc.h>
249#include <linux/mm.h>
250#include <linux/ioport.h>
251#include <linux/time.h>
252#include <linux/blkdev.h>
253#include <linux/spinlock.h>
254#include <linux/interrupt.h>
255#include <asm/pgtable.h>
256
257#ifdef CONFIG_AMIGA
258#include <asm/amigahw.h>
259#include <asm/amigaints.h>
260#include <asm/irq.h>
261
262#define BIG_ENDIAN
263#define NO_IO_SPACE
264#endif
265
266#ifdef CONFIG_MVME16x
267#include <asm/mvme16xhw.h>
268
269#define BIG_ENDIAN
270#define NO_IO_SPACE
271#define VALID_IDS
272#endif
273
274#ifdef CONFIG_BVME6000
275#include <asm/bvme6000hw.h>
276
277#define BIG_ENDIAN
278#define NO_IO_SPACE
279#define VALID_IDS
280#endif
281
282#include "scsi.h"
283#include <scsi/scsi_host.h>
284#include "53c7xx.h"
285#include <linux/stat.h>
286#include <linux/stddef.h>
287
288#ifdef NO_IO_SPACE
289/*
290 * The following make the definitions in 53c7xx.h (write8, etc) smaller,
291 * we don't have separate i/o space anyway.
292 */
293#undef inb
294#undef outb
295#undef inw
296#undef outw
297#undef inl
298#undef outl
299#define inb(x) 1
300#define inw(x) 1
301#define inl(x) 1
302#define outb(x,y) 1
303#define outw(x,y) 1
304#define outl(x,y) 1
305#endif
306
307static int check_address (unsigned long addr, int size);
308static void dump_events (struct Scsi_Host *host, int count);
309static Scsi_Cmnd * return_outstanding_commands (struct Scsi_Host *host,
310 int free, int issue);
311static void hard_reset (struct Scsi_Host *host);
312static void ncr_scsi_reset (struct Scsi_Host *host);
313static void print_lots (struct Scsi_Host *host);
314static void set_synchronous (struct Scsi_Host *host, int target, int sxfer,
315 int scntl3, int now_connected);
316static int datapath_residual (struct Scsi_Host *host);
317static const char * sbcl_to_phase (int sbcl);
318static void print_progress (Scsi_Cmnd *cmd);
319static void print_queues (struct Scsi_Host *host);
320static void process_issue_queue (unsigned long flags);
321static int shutdown (struct Scsi_Host *host);
322static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result);
323static int disable (struct Scsi_Host *host);
324static int NCR53c7xx_run_tests (struct Scsi_Host *host);
325static irqreturn_t NCR53c7x0_intr(int irq, void *dev_id, struct pt_regs * regs);
326static void NCR53c7x0_intfly (struct Scsi_Host *host);
327static int ncr_halt (struct Scsi_Host *host);
328static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd
329 *cmd);
330static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);
331static void print_dsa (struct Scsi_Host *host, u32 *dsa,
332 const char *prefix);
333static int print_insn (struct Scsi_Host *host, const u32 *insn,
334 const char *prefix, int kernel);
335
336static void NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd);
337static void NCR53c7x0_init_fixup (struct Scsi_Host *host);
338static int NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host, struct
339 NCR53c7x0_cmd *cmd);
340static void NCR53c7x0_soft_reset (struct Scsi_Host *host);
341
342/* Size of event list (per host adapter) */
343static int track_events = 0;
344static struct Scsi_Host *first_host = NULL; /* Head of list of NCR boards */
345static Scsi_Host_Template *the_template = NULL;
346
347/* NCR53c710 script handling code */
348
349#include "53c7xx_d.h"
350#ifdef A_int_debug_sync
351#define DEBUG_SYNC_INTR A_int_debug_sync
352#endif
353int NCR53c7xx_script_len = sizeof (SCRIPT);
354int NCR53c7xx_dsa_len = A_dsa_end + Ent_dsa_zero - Ent_dsa_code_template;
355#ifdef FORCE_DSA_ALIGNMENT
356int CmdPageStart = (0 - Ent_dsa_zero - sizeof(struct NCR53c7x0_cmd)) & 0xff;
357#endif
358
359static char *setup_strings[] =
360 {"","","","","","","",""};
361
362#define MAX_SETUP_STRINGS (sizeof(setup_strings) / sizeof(char *))
363#define SETUP_BUFFER_SIZE 200
364static char setup_buffer[SETUP_BUFFER_SIZE];
365static char setup_used[MAX_SETUP_STRINGS];
366
367void ncr53c7xx_setup (char *str, int *ints)
368{
369 int i;
370 char *p1, *p2;
371
372 p1 = setup_buffer;
373 *p1 = '\0';
374 if (str)
375 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
376 setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
377 p1 = setup_buffer;
378 i = 0;
379 while (*p1 && (i < MAX_SETUP_STRINGS)) {
380 p2 = strchr(p1, ',');
381 if (p2) {
382 *p2 = '\0';
383 if (p1 != p2)
384 setup_strings[i] = p1;
385 p1 = p2 + 1;
386 i++;
387 }
388 else {
389 setup_strings[i] = p1;
390 break;
391 }
392 }
393 for (i=0; i<MAX_SETUP_STRINGS; i++)
394 setup_used[i] = 0;
395}
396
397
398/* check_setup_strings() returns index if key found, 0 if not
399 */
400
401static int check_setup_strings(char *key, int *flags, int *val, char *buf)
402{
403int x;
404char *cp;
405
406 for (x=0; x<MAX_SETUP_STRINGS; x++) {
407 if (setup_used[x])
408 continue;
409 if (!strncmp(setup_strings[x], key, strlen(key)))
410 break;
411 if (!strncmp(setup_strings[x], "next", strlen("next")))
412 return 0;
413 }
414 if (x == MAX_SETUP_STRINGS)
415 return 0;
416 setup_used[x] = 1;
417 cp = setup_strings[x] + strlen(key);
418 *val = -1;
419 if (*cp != ':')
420 return ++x;
421 cp++;
422 if ((*cp >= '0') && (*cp <= '9')) {
423 *val = simple_strtoul(cp,NULL,0);
424 }
425 return ++x;
426}
427
428
429
430/*
431 * KNOWN BUGS :
432 * - There is some sort of conflict when the PPP driver is compiled with
433 * support for 16 channels?
434 *
435 * - On systems which predate the 1.3.x initialization order change,
436 * the NCR driver will cause Cannot get free page messages to appear.
437 * These are harmless, but I don't know of an easy way to avoid them.
438 *
439 * - With OPTION_DISCONNECT, on two systems under unknown circumstances,
440 * we get a PHASE MISMATCH with DSA set to zero (suggests that we
441 * are occurring somewhere in the reselection code) where
442 * DSP=some value DCMD|DBC=same value.
443 *
444 * Closer inspection suggests that we may be trying to execute
445 * some portion of the DSA?
446 * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
447 * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
448 * scsi0 : no current command : unexpected phase MSGIN.
449 * DSP=0x1c46cc, DCMD|DBC=0x1c46ac, DSA=0x0
450 * DSPS=0x0, TEMP=0x1c3e70, DMODE=0x80
451 * scsi0 : DSP->
452 * 001c46cc : 0x001c46cc 0x00000000
453 * 001c46d4 : 0x001c5ea0 0x000011f8
454 *
455 * Changed the print code in the phase_mismatch handler so
456 * that we call print_lots to try to diagnose this.
457 *
458 */
459
460/*
461 * Possible future direction of architecture for max performance :
462 *
463 * We're using a single start array for the NCR chip. This is
464 * sub-optimal, because we cannot add a command which would conflict with
465 * an executing command to this start queue, and therefore must insert the
466 * next command for a given I/T/L combination after the first has completed;
467 * incurring our interrupt latency between SCSI commands.
468 *
469 * To allow further pipelining of the NCR and host CPU operation, we want
470 * to set things up so that immediately on termination of a command destined
471 * for a given LUN, we get that LUN busy again.
472 *
473 * To do this, we need to add a 32 bit pointer to which is jumped to
474 * on completion of a command. If no new command is available, this
475 * would point to the usual DSA issue queue select routine.
476 *
477 * If one were, it would point to a per-NCR53c7x0_cmd select routine
478 * which starts execution immediately, inserting the command at the head
479 * of the start queue if the NCR chip is selected or reselected.
480 *
481 * We would change so that we keep a list of outstanding commands
482 * for each unit, rather than a single running_list. We'd insert
483 * a new command into the right running list; if the NCR didn't
484 * have something running for that yet, we'd put it in the
485 * start queue as well. Some magic needs to happen to handle the
486 * race condition between the first command terminating before the
487 * new one is written.
488 *
489 * Potential for profiling :
490 * Call do_gettimeofday(struct timeval *tv) to get 800ns resolution.
491 */
492
493
494/*
495 * TODO :
496 * 1. To support WIDE transfers, not much needs to happen. We
497 * should do CHMOVE instructions instead of MOVEs when
498 * we have scatter/gather segments of uneven length. When
499 * we do this, we need to handle the case where we disconnect
500 * between segments.
501 *
502 * 2. Currently, when Icky things happen we do a FATAL(). Instead,
503 * we want to do an integrity check on the parts of the NCR hostdata
504 * structure which were initialized at boot time; FATAL() if that
505 * fails, and otherwise try to recover. Keep track of how many
506 * times this has happened within a single SCSI command; if it
507 * gets excessive, then FATAL().
508 *
509 * 3. Parity checking is currently disabled, and a few things should
510 * happen here now that we support synchronous SCSI transfers :
511 * 1. On soft-reset, we shoould set the EPC (Enable Parity Checking)
512 * and AAP (Assert SATN/ on parity error) bits in SCNTL0.
513 *
514 * 2. We should enable the parity interrupt in the SIEN0 register.
515 *
516 * 3. intr_phase_mismatch() needs to believe that message out is
517 * always an "acceptable" phase to have a mismatch in. If
518 * the old phase was MSG_IN, we should send a MESSAGE PARITY
519 * error. If the old phase was something else, we should send
520 * a INITIATOR_DETECTED_ERROR message. Note that this could
521 * cause a RESTORE POINTERS message; so we should handle that
522 * correctly first. Instead, we should probably do an
523 * initiator_abort.
524 *
525 * 4. MPEE bit of CTEST4 should be set so we get interrupted if
526 * we detect an error.
527 *
528 *
529 * 5. The initial code has been tested on the NCR53c810. I don't
530 * have access to NCR53c700, 700-66 (Forex boards), NCR53c710
531 * (NCR Pentium systems), NCR53c720, NCR53c820, or NCR53c825 boards to
532 * finish development on those platforms.
533 *
534 * NCR53c820/825/720 - need to add wide transfer support, including WDTR
535 * negotiation, programming of wide transfer capabilities
536 * on reselection and table indirect selection.
537 *
538 * NCR53c710 - need to add fatal interrupt or GEN code for
539 * command completion signaling. Need to modify all
540 * SDID, SCID, etc. registers, and table indirect select code
541 * since these use bit fielded (ie 1<<target) instead of
542 * binary encoded target ids. Need to accommodate
543 * different register mappings, probably scan through
544 * the SCRIPT code and change the non SFBR register operand
545 * of all MOVE instructions.
546 *
547 * It is rather worse than this actually, the 710 corrupts
548 * both TEMP and DSA when you do a MOVE MEMORY. This
549 * screws you up all over the place. MOVE MEMORY 4 with a
550 * destination of DSA seems to work OK, which helps some.
551 * Richard Hirst richard@sleepie.demon.co.uk
552 *
553 * NCR53c700/700-66 - need to add code to refix addresses on
554 * every nexus change, eliminate all table indirect code,
555 * very messy.
556 *
557 * 6. The NCR53c7x0 series is very popular on other platforms that
558 * could be running Linux - ie, some high performance AMIGA SCSI
559 * boards use it.
560 *
561 * So, I should include #ifdef'd code so that it is
562 * compatible with these systems.
563 *
564 * Specifically, the little Endian assumptions I made in my
565 * bit fields need to change, and if the NCR doesn't see memory
566 * the right way, we need to provide options to reverse words
567 * when the scripts are relocated.
568 *
569 * 7. Use vremap() to access memory mapped boards.
570 */
571
572/*
573 * Allow for simultaneous existence of multiple SCSI scripts so we
574 * can have a single driver binary for all of the family.
575 *
576 * - one for NCR53c700 and NCR53c700-66 chips (not yet supported)
577 * - one for rest (only the NCR53c810, 815, 820, and 825 are currently
578 * supported)
579 *
580 * So that we only need two SCSI scripts, we need to modify things so
581 * that we fixup register accesses in READ/WRITE instructions, and
582 * we'll also have to accommodate the bit vs. binary encoding of IDs
583 * with the 7xx chips.
584 */
585
586#define ROUNDUP(adr,type) \
587 ((void *) (((long) (adr) + sizeof(type) - 1) & ~(sizeof(type) - 1)))
588
589
590/*
591 * Function: issue_to_cmd
592 *
593 * Purpose: convert jump instruction in issue array to NCR53c7x0_cmd
594 * structure pointer.
595 *
596 * Inputs; issue - pointer to start of NOP or JUMP instruction
597 * in issue array.
598 *
599 * Returns: pointer to command on success; 0 if opcode is NOP.
600 */
601
602static inline struct NCR53c7x0_cmd *
603issue_to_cmd (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
604 u32 *issue)
605{
606 return (issue[0] != hostdata->NOP_insn) ?
607 /*
608 * If the IF TRUE bit is set, it's a JUMP instruction. The
609 * operand is a bus pointer to the dsa_begin routine for this DSA. The
610 * dsa field of the NCR53c7x0_cmd structure starts with the
611 * DSA code template. By converting to a virtual address,
612 * subtracting the code template size, and offset of the
613 * dsa field, we end up with a pointer to the start of the
614 * structure (alternatively, we could use the
615 * dsa_cmnd field, an anachronism from when we weren't
616 * sure what the relationship between the NCR structures
617 * and host structures were going to be.
618 */
619 (struct NCR53c7x0_cmd *) ((char *) bus_to_virt (issue[1]) -
620 (hostdata->E_dsa_code_begin - hostdata->E_dsa_code_template) -
621 offsetof(struct NCR53c7x0_cmd, dsa))
622 /* If the IF TRUE bit is not set, it's a NOP */
623 : NULL;
624}
625
626
627/*
628 * FIXME: we should junk these, in favor of synchronous_want and
629 * wide_want in the NCR53c7x0_hostdata structure.
630 */
631
632/* Template for "preferred" synchronous transfer parameters. */
633
634static const unsigned char sdtr_message[] = {
635#ifdef CONFIG_SCSI_NCR53C7xx_FAST
636 EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 25 /* *4ns */, 8 /* off */
637#else
638 EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 50 /* *4ns */, 8 /* off */
639#endif
640};
641
642/* Template to request asynchronous transfers */
643
644static const unsigned char async_message[] = {
645 EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 0, 0 /* asynchronous */
646};
647
648/* Template for "preferred" WIDE transfer parameters */
649
650static const unsigned char wdtr_message[] = {
651 EXTENDED_MESSAGE, 2 /* length */, EXTENDED_WDTR, 1 /* 2^1 bytes */
652};
653
654#if 0
655/*
656 * Function : struct Scsi_Host *find_host (int host)
657 *
658 * Purpose : KGDB support function which translates a host number
659 * to a host structure.
660 *
661 * Inputs : host - number of SCSI host
662 *
663 * Returns : NULL on failure, pointer to host structure on success.
664 */
665
666static struct Scsi_Host *
667find_host (int host) {
668 struct Scsi_Host *h;
669 for (h = first_host; h && h->host_no != host; h = h->next);
670 if (!h) {
671 printk (KERN_ALERT "scsi%d not found\n", host);
672 return NULL;
673 } else if (h->hostt != the_template) {
674 printk (KERN_ALERT "scsi%d is not a NCR board\n", host);
675 return NULL;
676 }
677 return h;
678}
679
680#if 0
681/*
682 * Function : request_synchronous (int host, int target)
683 *
684 * Purpose : KGDB interface which will allow us to negotiate for
685 * synchronous transfers. This ill be replaced with a more
686 * integrated function; perhaps a new entry in the scsi_host
687 * structure, accessible via an ioctl() or perhaps /proc/scsi.
688 *
689 * Inputs : host - number of SCSI host; target - number of target.
690 *
691 * Returns : 0 when negotiation has been setup for next SCSI command,
692 * -1 on failure.
693 */
694
695static int
696request_synchronous (int host, int target) {
697 struct Scsi_Host *h;
698 struct NCR53c7x0_hostdata *hostdata;
699 unsigned long flags;
700 if (target < 0) {
701 printk (KERN_ALERT "target %d is bogus\n", target);
702 return -1;
703 }
704 if (!(h = find_host (host)))
705 return -1;
706 else if (h->this_id == target) {
707 printk (KERN_ALERT "target %d is host ID\n", target);
708 return -1;
709 }
710 else if (target > h->max_id) {
711 printk (KERN_ALERT "target %d exceeds maximum of %d\n", target,
712 h->max_id);
713 return -1;
714 }
715 hostdata = (struct NCR53c7x0_hostdata *)h->hostdata[0];
716
717 local_irq_save(flags);
718 if (hostdata->initiate_sdtr & (1 << target)) {
719 local_irq_restore(flags);
720 printk (KERN_ALERT "target %d already doing SDTR\n", target);
721 return -1;
722 }
723 hostdata->initiate_sdtr |= (1 << target);
724 local_irq_restore(flags);
725 return 0;
726}
727#endif
728
729/*
730 * Function : request_disconnect (int host, int on_or_off)
731 *
732 * Purpose : KGDB support function, tells us to allow or disallow
733 * disconnections.
734 *
735 * Inputs : host - number of SCSI host; on_or_off - non-zero to allow,
736 * zero to disallow.
737 *
738 * Returns : 0 on success, * -1 on failure.
739 */
740
741static int
742request_disconnect (int host, int on_or_off) {
743 struct Scsi_Host *h;
744 struct NCR53c7x0_hostdata *hostdata;
745 if (!(h = find_host (host)))
746 return -1;
747 hostdata = (struct NCR53c7x0_hostdata *) h->hostdata[0];
748 if (on_or_off)
749 hostdata->options |= OPTION_DISCONNECT;
750 else
751 hostdata->options &= ~OPTION_DISCONNECT;
752 return 0;
753}
754#endif
755
756/*
757 * Function : static void NCR53c7x0_driver_init (struct Scsi_Host *host)
758 *
759 * Purpose : Initialize internal structures, as required on startup, or
760 * after a SCSI bus reset.
761 *
762 * Inputs : host - pointer to this host adapter's structure
763 */
764
765static void
766NCR53c7x0_driver_init (struct Scsi_Host *host) {
767 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
768 host->hostdata[0];
769 int i, j;
770 u32 *ncrcurrent;
771
772 for (i = 0; i < 16; ++i) {
773 hostdata->request_sense[i] = 0;
774 for (j = 0; j < 8; ++j)
775 hostdata->busy[i][j] = 0;
776 set_synchronous (host, i, /* sxfer */ 0, hostdata->saved_scntl3, 0);
777 }
778 hostdata->issue_queue = NULL;
779 hostdata->running_list = hostdata->finished_queue =
780 hostdata->ncrcurrent = NULL;
781 for (i = 0, ncrcurrent = (u32 *) hostdata->schedule;
782 i < host->can_queue; ++i, ncrcurrent += 2) {
783 ncrcurrent[0] = hostdata->NOP_insn;
784 ncrcurrent[1] = 0xdeadbeef;
785 }
786 ncrcurrent[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) | DBC_TCI_TRUE;
787 ncrcurrent[1] = (u32) virt_to_bus (hostdata->script) +
788 hostdata->E_wait_reselect;
789 hostdata->reconnect_dsa_head = 0;
790 hostdata->addr_reconnect_dsa_head = (u32)
791 virt_to_bus((void *) &(hostdata->reconnect_dsa_head));
792 hostdata->expecting_iid = 0;
793 hostdata->expecting_sto = 0;
794 if (hostdata->options & OPTION_ALWAYS_SYNCHRONOUS)
795 hostdata->initiate_sdtr = 0xffff;
796 else
797 hostdata->initiate_sdtr = 0;
798 hostdata->talked_to = 0;
799 hostdata->idle = 1;
800}
801
802/*
803 * Function : static int clock_to_ccf_710 (int clock)
804 *
805 * Purpose : Return the clock conversion factor for a given SCSI clock.
806 *
807 * Inputs : clock - SCSI clock expressed in Hz.
808 *
809 * Returns : ccf on success, -1 on failure.
810 */
811
812static int
813clock_to_ccf_710 (int clock) {
814 if (clock <= 16666666)
815 return -1;
816 if (clock <= 25000000)
817 return 2; /* Divide by 1.0 */
818 else if (clock <= 37500000)
819 return 1; /* Divide by 1.5 */
820 else if (clock <= 50000000)
821 return 0; /* Divide by 2.0 */
822 else if (clock <= 66000000)
823 return 3; /* Divide by 3.0 */
824 else
825 return -1;
826}
827
828/*
829 * Function : static int NCR53c7x0_init (struct Scsi_Host *host)
830 *
831 * Purpose : initialize the internal structures for a given SCSI host
832 *
833 * Inputs : host - pointer to this host adapter's structure
834 *
835 * Preconditions : when this function is called, the chip_type
836 * field of the hostdata structure MUST have been set.
837 *
838 * Returns : 0 on success, -1 on failure.
839 */
840
841int
842NCR53c7x0_init (struct Scsi_Host *host) {
843 NCR53c7x0_local_declare();
844 int i, ccf;
845 unsigned char revision;
846 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
847 host->hostdata[0];
848 /*
849 * There are some things which we need to know about in order to provide
850 * a semblance of support. Print 'em if they aren't what we expect,
851 * otherwise don't add to the noise.
852 *
853 * -1 means we don't know what to expect.
854 */
855 int val, flags;
856 char buf[32];
857 int expected_id = -1;
858 int expected_clock = -1;
859 int uninitialized = 0;
860#ifdef NO_IO_SPACE
861 int expected_mapping = OPTION_MEMORY_MAPPED;
862#else
863 int expected_mapping = OPTION_IO_MAPPED;
864#endif
865 for (i=0;i<7;i++)
866 hostdata->valid_ids[i] = 1; /* Default all ID's to scan */
867
868 /* Parse commandline flags */
869 if (check_setup_strings("noasync",&flags,&val,buf))
870 {
871 hostdata->options |= OPTION_NO_ASYNC;
872 hostdata->options &= ~(OPTION_SYNCHRONOUS | OPTION_ALWAYS_SYNCHRONOUS);
873 }
874
875 if (check_setup_strings("nosync",&flags,&val,buf))
876 {
877 hostdata->options &= ~(OPTION_SYNCHRONOUS | OPTION_ALWAYS_SYNCHRONOUS);
878 }
879
880 if (check_setup_strings("nodisconnect",&flags,&val,buf))
881 hostdata->options &= ~OPTION_DISCONNECT;
882
883 if (check_setup_strings("validids",&flags,&val,buf))
884 {
885 for (i=0;i<7;i++)
886 hostdata->valid_ids[i] = val & (1<<i);
887 }
888
889 if ((i = check_setup_strings("next",&flags,&val,buf)))
890 {
891 while (i)
892 setup_used[--i] = 1;
893 }
894
895 if (check_setup_strings("opthi",&flags,&val,buf))
896 hostdata->options = (long long)val << 32;
897 if (check_setup_strings("optlo",&flags,&val,buf))
898 hostdata->options |= val;
899
900 NCR53c7x0_local_setup(host);
901 switch (hostdata->chip) {
902 case 710:
903 case 770:
904 hostdata->dstat_sir_intr = NCR53c7x0_dstat_sir_intr;
905 hostdata->init_save_regs = NULL;
906 hostdata->dsa_fixup = NCR53c7xx_dsa_fixup;
907 hostdata->init_fixup = NCR53c7x0_init_fixup;
908 hostdata->soft_reset = NCR53c7x0_soft_reset;
909 hostdata->run_tests = NCR53c7xx_run_tests;
910 expected_clock = hostdata->scsi_clock;
911 expected_id = 7;
912 break;
913 default:
914 printk ("scsi%d : chip type of %d is not supported yet, detaching.\n",
915 host->host_no, hostdata->chip);
916 scsi_unregister (host);
917 return -1;
918 }
919
920 /* Assign constants accessed by NCR */
921 hostdata->NCR53c7xx_zero = 0;
922 hostdata->NCR53c7xx_msg_reject = MESSAGE_REJECT;
923 hostdata->NCR53c7xx_msg_abort = ABORT;
924 hostdata->NCR53c7xx_msg_nop = NOP;
925 hostdata->NOP_insn = (DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24;
926 if (expected_mapping == -1 ||
927 (hostdata->options & (OPTION_MEMORY_MAPPED)) !=
928 (expected_mapping & OPTION_MEMORY_MAPPED))
929 printk ("scsi%d : using %s mapped access\n", host->host_no,
930 (hostdata->options & OPTION_MEMORY_MAPPED) ? "memory" :
931 "io");
932
933 hostdata->dmode = (hostdata->chip == 700 || hostdata->chip == 70066) ?
934 DMODE_REG_00 : DMODE_REG_10;
935 hostdata->istat = ((hostdata->chip / 100) == 8) ?
936 ISTAT_REG_800 : ISTAT_REG_700;
937
938/* We have to assume that this may be the first access to the chip, so
939 * we must set EA in DCNTL. */
940
941 NCR53c7x0_write8 (DCNTL_REG, DCNTL_10_EA|DCNTL_10_COM);
942
943
944/* Only the ISTAT register is readable when the NCR is running, so make
945 sure it's halted. */
946 ncr_halt(host);
947
948/*
949 * XXX - the NCR53c700 uses bitfielded registers for SCID, SDID, etc,
950 * as does the 710 with one bit per SCSI ID. Conversely, the NCR
951 * uses a normal, 3 bit binary representation of these values.
952 *
953 * Get the rest of the NCR documentation, and FIND OUT where the change
954 * was.
955 */
956
957#if 0
958 /* May not be able to do this - chip my not have been set up yet */
959 tmp = hostdata->this_id_mask = NCR53c7x0_read8(SCID_REG);
960 for (host->this_id = 0; tmp != 1; tmp >>=1, ++host->this_id);
961#else
962 host->this_id = 7;
963#endif
964
965/*
966 * Note : we should never encounter a board setup for ID0. So,
967 * if we see ID0, assume that it was uninitialized and set it
968 * to the industry standard 7.
969 */
970 if (!host->this_id) {
971 printk("scsi%d : initiator ID was %d, changing to 7\n",
972 host->host_no, host->this_id);
973 host->this_id = 7;
974 hostdata->this_id_mask = 1 << 7;
975 uninitialized = 1;
976 };
977
978 if (expected_id == -1 || host->this_id != expected_id)
979 printk("scsi%d : using initiator ID %d\n", host->host_no,
980 host->this_id);
981
982 /*
983 * Save important registers to allow a soft reset.
984 */
985
986 /*
987 * CTEST7 controls cache snooping, burst mode, and support for
988 * external differential drivers. This isn't currently used - the
989 * default value may not be optimal anyway.
990 * Even worse, it may never have been set up since reset.
991 */
992 hostdata->saved_ctest7 = NCR53c7x0_read8(CTEST7_REG) & CTEST7_SAVE;
993 revision = (NCR53c7x0_read8(CTEST8_REG) & 0xF0) >> 4;
994 switch (revision) {
995 case 1: revision = 0; break;
996 case 2: revision = 1; break;
997 case 4: revision = 2; break;
998 case 8: revision = 3; break;
999 default: revision = 255; break;
1000 }
1001 printk("scsi%d: Revision 0x%x\n",host->host_no,revision);
1002
1003 if ((revision == 0 || revision == 255) && (hostdata->options & (OPTION_SYNCHRONOUS|OPTION_DISCONNECT|OPTION_ALWAYS_SYNCHRONOUS)))
1004 {
1005 printk ("scsi%d: Disabling sync working and disconnect/reselect\n",
1006 host->host_no);
1007 hostdata->options &= ~(OPTION_SYNCHRONOUS|OPTION_DISCONNECT|OPTION_ALWAYS_SYNCHRONOUS);
1008 }
1009
1010 /*
1011 * On NCR53c700 series chips, DCNTL controls the SCSI clock divisor,
1012 * on 800 series chips, it allows for a totem-pole IRQ driver.
1013 * NOTE saved_dcntl currently overwritten in init function.
1014 * The value read here may be garbage anyway, MVME16x board at least
1015 * does not initialise chip if kernel arrived via tftp.
1016 */
1017
1018 hostdata->saved_dcntl = NCR53c7x0_read8(DCNTL_REG);
1019
1020 /*
1021 * DMODE controls DMA burst length, and on 700 series chips,
1022 * 286 mode and bus width
1023 * NOTE: On MVME16x, chip may have been reset, so this could be a
1024 * power-on/reset default value.
1025 */
1026 hostdata->saved_dmode = NCR53c7x0_read8(hostdata->dmode);
1027
1028 /*
1029 * Now that burst length and enabled/disabled status is known,
1030 * clue the user in on it.
1031 */
1032
1033 ccf = clock_to_ccf_710 (expected_clock);
1034
1035 for (i = 0; i < 16; ++i)
1036 hostdata->cmd_allocated[i] = 0;
1037
1038 if (hostdata->init_save_regs)
1039 hostdata->init_save_regs (host);
1040 if (hostdata->init_fixup)
1041 hostdata->init_fixup (host);
1042
1043 if (!the_template) {
1044 the_template = host->hostt;
1045 first_host = host;
1046 }
1047
1048 /*
1049 * Linux SCSI drivers have always been plagued with initialization
1050 * problems - some didn't work with the BIOS disabled since they expected
1051 * initialization from it, some didn't work when the networking code
1052 * was enabled and registers got scrambled, etc.
1053 *
1054 * To avoid problems like this, in the future, we will do a soft
1055 * reset on the SCSI chip, taking it back to a sane state.
1056 */
1057
1058 hostdata->soft_reset (host);
1059
1060#if 1
1061 hostdata->debug_count_limit = -1;
1062#else
1063 hostdata->debug_count_limit = 1;
1064#endif
1065 hostdata->intrs = -1;
1066 hostdata->resets = -1;
1067 memcpy ((void *) hostdata->synchronous_want, (void *) sdtr_message,
1068 sizeof (hostdata->synchronous_want));
1069
1070 NCR53c7x0_driver_init (host);
1071
1072 if (request_irq(host->irq, NCR53c7x0_intr, SA_SHIRQ, "53c7xx", host))
1073 {
1074 printk("scsi%d : IRQ%d not free, detaching\n",
1075 host->host_no, host->irq);
1076 goto err_unregister;
1077 }
1078
1079 if ((hostdata->run_tests && hostdata->run_tests(host) == -1) ||
1080 (hostdata->options & OPTION_DEBUG_TESTS_ONLY)) {
1081 /* XXX Should disable interrupts, etc. here */
1082 goto err_free_irq;
1083 } else {
1084 if (host->io_port) {
1085 host->n_io_port = 128;
1086 if (!request_region (host->io_port, host->n_io_port, "ncr53c7xx"))
1087 goto err_free_irq;
1088 }
1089 }
1090
1091 if (NCR53c7x0_read8 (SBCL_REG) & SBCL_BSY) {
1092 printk ("scsi%d : bus wedge, doing SCSI reset\n", host->host_no);
1093 hard_reset (host);
1094 }
1095 return 0;
1096
1097 err_free_irq:
1098 free_irq(host->irq, NCR53c7x0_intr);
1099 err_unregister:
1100 scsi_unregister(host);
1101 return -1;
1102}
1103
1104/*
1105 * Function : int ncr53c7xx_init(Scsi_Host_Template *tpnt, int board, int chip,
1106 * unsigned long base, int io_port, int irq, int dma, long long options,
1107 * int clock);
1108 *
1109 * Purpose : initializes a NCR53c7,8x0 based on base addresses,
1110 * IRQ, and DMA channel.
1111 *
1112 * Inputs : tpnt - Template for this SCSI adapter, board - board level
1113 * product, chip - 710
1114 *
1115 * Returns : 0 on success, -1 on failure.
1116 *
1117 */
1118
1119int
1120ncr53c7xx_init (Scsi_Host_Template *tpnt, int board, int chip,
1121 unsigned long base, int io_port, int irq, int dma,
1122 long long options, int clock)
1123{
1124 struct Scsi_Host *instance;
1125 struct NCR53c7x0_hostdata *hostdata;
1126 char chip_str[80];
1127 int script_len = 0, dsa_len = 0, size = 0, max_cmd_size = 0,
1128 schedule_size = 0, ok = 0;
1129 void *tmp;
1130 unsigned long page;
1131
1132 switch (chip) {
1133 case 710:
1134 case 770:
1135 schedule_size = (tpnt->can_queue + 1) * 8 /* JUMP instruction size */;
1136 script_len = NCR53c7xx_script_len;
1137 dsa_len = NCR53c7xx_dsa_len;
1138 options |= OPTION_INTFLY;
1139 sprintf (chip_str, "NCR53c%d", chip);
1140 break;
1141 default:
1142 printk("scsi-ncr53c7xx : unsupported SCSI chip %d\n", chip);
1143 return -1;
1144 }
1145
1146 printk("scsi-ncr53c7xx : %s at memory 0x%lx, io 0x%x, irq %d",
1147 chip_str, base, io_port, irq);
1148 if (dma == DMA_NONE)
1149 printk("\n");
1150 else
1151 printk(", dma %d\n", dma);
1152
1153 if (options & OPTION_DEBUG_PROBE_ONLY) {
1154 printk ("scsi-ncr53c7xx : probe only enabled, aborting initialization\n");
1155 return -1;
1156 }
1157
1158 max_cmd_size = sizeof(struct NCR53c7x0_cmd) + dsa_len +
1159 /* Size of dynamic part of command structure : */
1160 2 * /* Worst case : we don't know if we need DATA IN or DATA out */
1161 ( 2 * /* Current instructions per scatter/gather segment */
1162 tpnt->sg_tablesize +
1163 3 /* Current startup / termination required per phase */
1164 ) *
1165 8 /* Each instruction is eight bytes */;
1166
1167 /* Allocate fixed part of hostdata, dynamic part to hold appropriate
1168 SCSI SCRIPT(tm) plus a single, maximum-sized NCR53c7x0_cmd structure.
1169
1170 We need a NCR53c7x0_cmd structure for scan_scsis() when we are
1171 not loaded as a module, and when we're loaded as a module, we
1172 can't use a non-dynamically allocated structure because modules
1173 are vmalloc()'d, which can allow structures to cross page
1174 boundaries and breaks our physical/virtual address assumptions
1175 for DMA.
1176
1177 So, we stick it past the end of our hostdata structure.
1178
1179 ASSUMPTION :
1180 Regardless of how many simultaneous SCSI commands we allow,
1181 the probe code only executes a _single_ instruction at a time,
1182 so we only need one here, and don't need to allocate NCR53c7x0_cmd
1183 structures for each target until we are no longer in scan_scsis
1184 and kmalloc() has become functional (memory_init() happens
1185 after all device driver initialization).
1186 */
1187
1188 size = sizeof(struct NCR53c7x0_hostdata) + script_len +
1189 /* Note that alignment will be guaranteed, since we put the command
1190 allocated at probe time after the fixed-up SCSI script, which
1191 consists of 32 bit words, aligned on a 32 bit boundary. But
1192 on a 64bit machine we need 8 byte alignment for hostdata->free, so
1193 we add in another 4 bytes to take care of potential misalignment
1194 */
1195 (sizeof(void *) - sizeof(u32)) + max_cmd_size + schedule_size;
1196
1197 page = __get_free_pages(GFP_ATOMIC,1);
1198 if(page==0)
1199 {
1200 printk(KERN_ERR "53c7xx: out of memory.\n");
1201 return -ENOMEM;
1202 }
1203#ifdef FORCE_DSA_ALIGNMENT
1204 /*
1205 * 53c710 rev.0 doesn't have an add-with-carry instruction.
1206 * Ensure we allocate enough memory to force DSA alignment.
1207 */
1208 size += 256;
1209#endif
1210 /* Size should be < 8K, so we can fit it in two pages. */
1211 if (size > 8192) {
1212 printk(KERN_ERR "53c7xx: hostdata > 8K\n");
1213 return -1;
1214 }
1215
1216 instance = scsi_register (tpnt, 4);
1217 if (!instance)
1218 {
1219 free_page(page);
1220 return -1;
1221 }
1222 instance->hostdata[0] = page;
1223 memset((void *)instance->hostdata[0], 0, 8192);
1224 cache_push(virt_to_phys((void *)(instance->hostdata[0])), 8192);
1225 cache_clear(virt_to_phys((void *)(instance->hostdata[0])), 8192);
1226 kernel_set_cachemode((void *)instance->hostdata[0], 8192, IOMAP_NOCACHE_SER);
1227
1228 /* FIXME : if we ever support an ISA NCR53c7xx based board, we
1229 need to check if the chip is running in a 16 bit mode, and if so
1230 unregister it if it is past the 16M (0x1000000) mark */
1231
1232 hostdata = (struct NCR53c7x0_hostdata *)instance->hostdata[0];
1233 hostdata->size = size;
1234 hostdata->script_count = script_len / sizeof(u32);
1235 hostdata->board = board;
1236 hostdata->chip = chip;
1237
1238 /*
1239 * Being memory mapped is more desirable, since
1240 *
1241 * - Memory accesses may be faster.
1242 *
1243 * - The destination and source address spaces are the same for
1244 * all instructions, meaning we don't have to twiddle dmode or
1245 * any other registers.
1246 *
1247 * So, we try for memory mapped, and if we don't get it,
1248 * we go for port mapped, and that failing we tell the user
1249 * it can't work.
1250 */
1251
1252 if (base) {
1253 instance->base = base;
1254 /* Check for forced I/O mapping */
1255 if (!(options & OPTION_IO_MAPPED)) {
1256 options |= OPTION_MEMORY_MAPPED;
1257 ok = 1;
1258 }
1259 } else {
1260 options &= ~OPTION_MEMORY_MAPPED;
1261 }
1262
1263 if (io_port) {
1264 instance->io_port = io_port;
1265 options |= OPTION_IO_MAPPED;
1266 ok = 1;
1267 } else {
1268 options &= ~OPTION_IO_MAPPED;
1269 }
1270
1271 if (!ok) {
1272 printk ("scsi%d : not initializing, no I/O or memory mapping known \n",
1273 instance->host_no);
1274 scsi_unregister (instance);
1275 return -1;
1276 }
1277 instance->irq = irq;
1278 instance->dma_channel = dma;
1279
1280 hostdata->options = options;
1281 hostdata->dsa_len = dsa_len;
1282 hostdata->max_cmd_size = max_cmd_size;
1283 hostdata->num_cmds = 1;
1284 hostdata->scsi_clock = clock;
1285 /* Initialize single command */
1286 tmp = (hostdata->script + hostdata->script_count);
1287#ifdef FORCE_DSA_ALIGNMENT
1288 {
1289 void *t = ROUNDUP(tmp, void *);
1290 if (((u32)t & 0xff) > CmdPageStart)
1291 t = (void *)((u32)t + 255);
1292 t = (void *)(((u32)t & ~0xff) + CmdPageStart);
1293 hostdata->free = t;
1294#if 0
1295 printk ("scsi: Registered size increased by 256 to %d\n", size);
1296 printk ("scsi: CmdPageStart = 0x%02x\n", CmdPageStart);
1297 printk ("scsi: tmp = 0x%08x, hostdata->free set to 0x%08x\n",
1298 (u32)tmp, (u32)t);
1299#endif
1300 }
1301#else
1302 hostdata->free = ROUNDUP(tmp, void *);
1303#endif
1304 hostdata->free->real = tmp;
1305 hostdata->free->size = max_cmd_size;
1306 hostdata->free->free = NULL;
1307 hostdata->free->next = NULL;
1308 hostdata->extra_allocate = 0;
1309
1310 /* Allocate command start code space */
1311 hostdata->schedule = (chip == 700 || chip == 70066) ?
1312 NULL : (u32 *) ((char *)hostdata->free + max_cmd_size);
1313
1314/*
1315 * For diagnostic purposes, we don't really care how fast things blaze.
1316 * For profiling, we want to access the 800ns resolution system clock,
1317 * using a 'C' call on the host processor.
1318 *
1319 * Therefore, there's no need for the NCR chip to directly manipulate
1320 * this data, and we should put it wherever is most convenient for
1321 * Linux.
1322 */
1323 if (track_events)
1324 hostdata->events = (struct NCR53c7x0_event *) (track_events ?
1325 vmalloc (sizeof (struct NCR53c7x0_event) * track_events) : NULL);
1326 else
1327 hostdata->events = NULL;
1328
1329 if (hostdata->events) {
1330 memset ((void *) hostdata->events, 0, sizeof(struct NCR53c7x0_event) *
1331 track_events);
1332 hostdata->event_size = track_events;
1333 hostdata->event_index = 0;
1334 } else
1335 hostdata->event_size = 0;
1336
1337 return NCR53c7x0_init(instance);
1338}
1339
1340
1341/*
1342 * Function : static void NCR53c7x0_init_fixup (struct Scsi_Host *host)
1343 *
1344 * Purpose : copy and fixup the SCSI SCRIPTS(tm) code for this device.
1345 *
1346 * Inputs : host - pointer to this host adapter's structure
1347 *
1348 */
1349
1350static void
1351NCR53c7x0_init_fixup (struct Scsi_Host *host) {
1352 NCR53c7x0_local_declare();
1353 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1354 host->hostdata[0];
1355 unsigned char tmp;
1356 int i, ncr_to_memory, memory_to_ncr;
1357 u32 base;
1358 NCR53c7x0_local_setup(host);
1359
1360
1361 /* XXX - NOTE : this code MUST be made endian aware */
1362 /* Copy code into buffer that was allocated at detection time. */
1363 memcpy ((void *) hostdata->script, (void *) SCRIPT,
1364 sizeof(SCRIPT));
1365 /* Fixup labels */
1366 for (i = 0; i < PATCHES; ++i)
1367 hostdata->script[LABELPATCHES[i]] +=
1368 virt_to_bus(hostdata->script);
1369 /* Fixup addresses of constants that used to be EXTERNAL */
1370
1371 patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_abort,
1372 virt_to_bus(&(hostdata->NCR53c7xx_msg_abort)));
1373 patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_reject,
1374 virt_to_bus(&(hostdata->NCR53c7xx_msg_reject)));
1375 patch_abs_32 (hostdata->script, 0, NCR53c7xx_zero,
1376 virt_to_bus(&(hostdata->NCR53c7xx_zero)));
1377 patch_abs_32 (hostdata->script, 0, NCR53c7xx_sink,
1378 virt_to_bus(&(hostdata->NCR53c7xx_sink)));
1379 patch_abs_32 (hostdata->script, 0, NOP_insn,
1380 virt_to_bus(&(hostdata->NOP_insn)));
1381 patch_abs_32 (hostdata->script, 0, schedule,
1382 virt_to_bus((void *) hostdata->schedule));
1383
1384 /* Fixup references to external variables: */
1385 for (i = 0; i < EXTERNAL_PATCHES_LEN; ++i)
1386 hostdata->script[EXTERNAL_PATCHES[i].offset] +=
1387 virt_to_bus(EXTERNAL_PATCHES[i].address);
1388
1389 /*
1390 * Fixup absolutes set at boot-time.
1391 *
1392 * All non-code absolute variables suffixed with "dsa_" and "int_"
1393 * are constants, and need no fixup provided the assembler has done
1394 * it for us (I don't know what the "real" NCR assembler does in
1395 * this case, my assembler does the right magic).
1396 */
1397
1398 patch_abs_rwri_data (hostdata->script, 0, dsa_save_data_pointer,
1399 Ent_dsa_code_save_data_pointer - Ent_dsa_zero);
1400 patch_abs_rwri_data (hostdata->script, 0, dsa_restore_pointers,
1401 Ent_dsa_code_restore_pointers - Ent_dsa_zero);
1402 patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect,
1403 Ent_dsa_code_check_reselect - Ent_dsa_zero);
1404
1405 /*
1406 * Just for the hell of it, preserve the settings of
1407 * Burst Length and Enable Read Line bits from the DMODE
1408 * register. Make sure SCRIPTS start automagically.
1409 */
1410
1411#if defined(CONFIG_MVME16x) || defined(CONFIG_BVME6000)
1412 /* We know better what we want than 16xBug does! */
1413 tmp = DMODE_10_BL_8 | DMODE_10_FC2;
1414#else
1415 tmp = NCR53c7x0_read8(DMODE_REG_10);
1416 tmp &= (DMODE_BL_MASK | DMODE_10_FC2 | DMODE_10_FC1 | DMODE_710_PD |
1417 DMODE_710_UO);
1418#endif
1419
1420 if (!(hostdata->options & OPTION_MEMORY_MAPPED)) {
1421 base = (u32) host->io_port;
1422 memory_to_ncr = tmp|DMODE_800_DIOM;
1423 ncr_to_memory = tmp|DMODE_800_SIOM;
1424 } else {
1425 base = virt_to_bus((void *)host->base);
1426 memory_to_ncr = ncr_to_memory = tmp;
1427 }
1428
1429 /* SCRATCHB_REG_10 == SCRATCHA_REG_800, as it happens */
1430 patch_abs_32 (hostdata->script, 0, addr_scratch, base + SCRATCHA_REG_800);
1431 patch_abs_32 (hostdata->script, 0, addr_temp, base + TEMP_REG);
1432 patch_abs_32 (hostdata->script, 0, addr_dsa, base + DSA_REG);
1433
1434 /*
1435 * I needed some variables in the script to be accessible to
1436 * both the NCR chip and the host processor. For these variables,
1437 * I made the arbitrary decision to store them directly in the
1438 * hostdata structure rather than in the RELATIVE area of the
1439 * SCRIPTS.
1440 */
1441
1442
1443 patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_memory, tmp);
1444 patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_ncr, memory_to_ncr);
1445 patch_abs_rwri_data (hostdata->script, 0, dmode_ncr_to_memory, ncr_to_memory);
1446
1447 patch_abs_32 (hostdata->script, 0, msg_buf,
1448 virt_to_bus((void *)&(hostdata->msg_buf)));
1449 patch_abs_32 (hostdata->script, 0, reconnect_dsa_head,
1450 virt_to_bus((void *)&(hostdata->reconnect_dsa_head)));
1451 patch_abs_32 (hostdata->script, 0, addr_reconnect_dsa_head,
1452 virt_to_bus((void *)&(hostdata->addr_reconnect_dsa_head)));
1453 patch_abs_32 (hostdata->script, 0, reselected_identify,
1454 virt_to_bus((void *)&(hostdata->reselected_identify)));
1455/* reselected_tag is currently unused */
1456#if 0
1457 patch_abs_32 (hostdata->script, 0, reselected_tag,
1458 virt_to_bus((void *)&(hostdata->reselected_tag)));
1459#endif
1460
1461 patch_abs_32 (hostdata->script, 0, test_dest,
1462 virt_to_bus((void*)&hostdata->test_dest));
1463 patch_abs_32 (hostdata->script, 0, test_src,
1464 virt_to_bus(&hostdata->test_source));
1465 patch_abs_32 (hostdata->script, 0, saved_dsa,
1466 virt_to_bus((void *)&hostdata->saved2_dsa));
1467 patch_abs_32 (hostdata->script, 0, emulfly,
1468 virt_to_bus((void *)&hostdata->emulated_intfly));
1469
1470 patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect,
1471 (unsigned char)(Ent_dsa_code_check_reselect - Ent_dsa_zero));
1472
1473/* These are for event logging; the ncr_event enum contains the
1474 actual interrupt numbers. */
1475#ifdef A_int_EVENT_SELECT
1476 patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT, (u32) EVENT_SELECT);
1477#endif
1478#ifdef A_int_EVENT_DISCONNECT
1479 patch_abs_32 (hostdata->script, 0, int_EVENT_DISCONNECT, (u32) EVENT_DISCONNECT);
1480#endif
1481#ifdef A_int_EVENT_RESELECT
1482 patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT, (u32) EVENT_RESELECT);
1483#endif
1484#ifdef A_int_EVENT_COMPLETE
1485 patch_abs_32 (hostdata->script, 0, int_EVENT_COMPLETE, (u32) EVENT_COMPLETE);
1486#endif
1487#ifdef A_int_EVENT_IDLE
1488 patch_abs_32 (hostdata->script, 0, int_EVENT_IDLE, (u32) EVENT_IDLE);
1489#endif
1490#ifdef A_int_EVENT_SELECT_FAILED
1491 patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT_FAILED,
1492 (u32) EVENT_SELECT_FAILED);
1493#endif
1494#ifdef A_int_EVENT_BEFORE_SELECT
1495 patch_abs_32 (hostdata->script, 0, int_EVENT_BEFORE_SELECT,
1496 (u32) EVENT_BEFORE_SELECT);
1497#endif
1498#ifdef A_int_EVENT_RESELECT_FAILED
1499 patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT_FAILED,
1500 (u32) EVENT_RESELECT_FAILED);
1501#endif
1502
1503 /*
1504 * Make sure the NCR and Linux code agree on the location of
1505 * certain fields.
1506 */
1507
1508 hostdata->E_accept_message = Ent_accept_message;
1509 hostdata->E_command_complete = Ent_command_complete;
1510 hostdata->E_cmdout_cmdout = Ent_cmdout_cmdout;
1511 hostdata->E_data_transfer = Ent_data_transfer;
1512 hostdata->E_debug_break = Ent_debug_break;
1513 hostdata->E_dsa_code_template = Ent_dsa_code_template;
1514 hostdata->E_dsa_code_template_end = Ent_dsa_code_template_end;
1515 hostdata->E_end_data_transfer = Ent_end_data_transfer;
1516 hostdata->E_initiator_abort = Ent_initiator_abort;
1517 hostdata->E_msg_in = Ent_msg_in;
1518 hostdata->E_other_transfer = Ent_other_transfer;
1519 hostdata->E_other_in = Ent_other_in;
1520 hostdata->E_other_out = Ent_other_out;
1521 hostdata->E_reject_message = Ent_reject_message;
1522 hostdata->E_respond_message = Ent_respond_message;
1523 hostdata->E_select = Ent_select;
1524 hostdata->E_select_msgout = Ent_select_msgout;
1525 hostdata->E_target_abort = Ent_target_abort;
1526#ifdef Ent_test_0
1527 hostdata->E_test_0 = Ent_test_0;
1528#endif
1529 hostdata->E_test_1 = Ent_test_1;
1530 hostdata->E_test_2 = Ent_test_2;
1531#ifdef Ent_test_3
1532 hostdata->E_test_3 = Ent_test_3;
1533#endif
1534 hostdata->E_wait_reselect = Ent_wait_reselect;
1535 hostdata->E_dsa_code_begin = Ent_dsa_code_begin;
1536
1537 hostdata->dsa_cmdout = A_dsa_cmdout;
1538 hostdata->dsa_cmnd = A_dsa_cmnd;
1539 hostdata->dsa_datain = A_dsa_datain;
1540 hostdata->dsa_dataout = A_dsa_dataout;
1541 hostdata->dsa_end = A_dsa_end;
1542 hostdata->dsa_msgin = A_dsa_msgin;
1543 hostdata->dsa_msgout = A_dsa_msgout;
1544 hostdata->dsa_msgout_other = A_dsa_msgout_other;
1545 hostdata->dsa_next = A_dsa_next;
1546 hostdata->dsa_select = A_dsa_select;
1547 hostdata->dsa_start = Ent_dsa_code_template - Ent_dsa_zero;
1548 hostdata->dsa_status = A_dsa_status;
1549 hostdata->dsa_jump_dest = Ent_dsa_code_fix_jump - Ent_dsa_zero +
1550 8 /* destination operand */;
1551
1552 /* sanity check */
1553 if (A_dsa_fields_start != Ent_dsa_code_template_end -
1554 Ent_dsa_zero)
1555 printk("scsi%d : NCR dsa_fields start is %d not %d\n",
1556 host->host_no, A_dsa_fields_start, Ent_dsa_code_template_end -
1557 Ent_dsa_zero);
1558
1559 printk("scsi%d : NCR code relocated to 0x%lx (virt 0x%p)\n", host->host_no,
1560 virt_to_bus(hostdata->script), hostdata->script);
1561}
1562
1563/*
1564 * Function : static int NCR53c7xx_run_tests (struct Scsi_Host *host)
1565 *
1566 * Purpose : run various verification tests on the NCR chip,
1567 * including interrupt generation, and proper bus mastering
1568 * operation.
1569 *
1570 * Inputs : host - a properly initialized Scsi_Host structure
1571 *
1572 * Preconditions : the NCR chip must be in a halted state.
1573 *
1574 * Returns : 0 if all tests were successful, -1 on error.
1575 *
1576 */
1577
1578static int
1579NCR53c7xx_run_tests (struct Scsi_Host *host) {
1580 NCR53c7x0_local_declare();
1581 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1582 host->hostdata[0];
1583 unsigned long timeout;
1584 u32 start;
1585 int failed, i;
1586 unsigned long flags;
1587 NCR53c7x0_local_setup(host);
1588
1589 /* The NCR chip _must_ be idle to run the test scripts */
1590
1591 local_irq_save(flags);
1592 if (!hostdata->idle) {
1593 printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
1594 local_irq_restore(flags);
1595 return -1;
1596 }
1597
1598 /*
1599 * Check for functional interrupts, this could work as an
1600 * autoprobe routine.
1601 */
1602
1603 if ((hostdata->options & OPTION_DEBUG_TEST1) &&
1604 hostdata->state != STATE_DISABLED) {
1605 hostdata->idle = 0;
1606 hostdata->test_running = 1;
1607 hostdata->test_completed = -1;
1608 hostdata->test_dest = 0;
1609 hostdata->test_source = 0xdeadbeef;
1610 start = virt_to_bus (hostdata->script) + hostdata->E_test_1;
1611 hostdata->state = STATE_RUNNING;
1612 printk ("scsi%d : test 1", host->host_no);
1613 NCR53c7x0_write32 (DSP_REG, start);
1614 if (hostdata->options & OPTION_DEBUG_TRACE)
1615 NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl | DCNTL_SSM |
1616 DCNTL_STD);
1617 printk (" started\n");
1618 local_irq_restore(flags);
1619
1620 /*
1621 * This is currently a .5 second timeout, since (in theory) no slow
1622 * board will take that long. In practice, we've seen one
1623 * pentium which occassionally fails with this, but works with
1624 * 10 times as much?
1625 */
1626
1627 timeout = jiffies + 5 * HZ / 10;
1628 while ((hostdata->test_completed == -1) && time_before(jiffies, timeout))
1629 barrier();
1630
1631 failed = 1;
1632 if (hostdata->test_completed == -1)
1633 printk ("scsi%d : driver test 1 timed out%s\n",host->host_no ,
1634 (hostdata->test_dest == 0xdeadbeef) ?
1635 " due to lost interrupt.\n"
1636 " Please verify that the correct IRQ is being used for your board,\n"
1637 : "");
1638 else if (hostdata->test_completed != 1)
1639 printk ("scsi%d : test 1 bad interrupt value (%d)\n",
1640 host->host_no, hostdata->test_completed);
1641 else
1642 failed = (hostdata->test_dest != 0xdeadbeef);
1643
1644 if (hostdata->test_dest != 0xdeadbeef) {
1645 printk ("scsi%d : driver test 1 read 0x%x instead of 0xdeadbeef indicating a\n"
1646 " probable cache invalidation problem. Please configure caching\n"
1647 " as write-through or disabled\n",
1648 host->host_no, hostdata->test_dest);
1649 }
1650
1651 if (failed) {
1652 printk ("scsi%d : DSP = 0x%p (script at 0x%p, start at 0x%x)\n",
1653 host->host_no, bus_to_virt(NCR53c7x0_read32(DSP_REG)),
1654 hostdata->script, start);
1655 printk ("scsi%d : DSPS = 0x%x\n", host->host_no,
1656 NCR53c7x0_read32(DSPS_REG));
1657 local_irq_restore(flags);
1658 return -1;
1659 }
1660 hostdata->test_running = 0;
1661 }
1662
1663 if ((hostdata->options & OPTION_DEBUG_TEST2) &&
1664 hostdata->state != STATE_DISABLED) {
1665 u32 dsa[48];
1666 unsigned char identify = IDENTIFY(0, 0);
1667 unsigned char cmd[6];
1668 unsigned char data[36];
1669 unsigned char status = 0xff;
1670 unsigned char msg = 0xff;
1671
1672 cmd[0] = INQUIRY;
1673 cmd[1] = cmd[2] = cmd[3] = cmd[5] = 0;
1674 cmd[4] = sizeof(data);
1675
1676 dsa[2] = 1;
1677 dsa[3] = virt_to_bus(&identify);
1678 dsa[4] = 6;
1679 dsa[5] = virt_to_bus(&cmd);
1680 dsa[6] = sizeof(data);
1681 dsa[7] = virt_to_bus(&data);
1682 dsa[8] = 1;
1683 dsa[9] = virt_to_bus(&status);
1684 dsa[10] = 1;
1685 dsa[11] = virt_to_bus(&msg);
1686
1687 for (i = 0; i < 6; ++i) {
1688#ifdef VALID_IDS
1689 if (!hostdata->valid_ids[i])
1690 continue;
1691#endif
1692 local_irq_disable();
1693 if (!hostdata->idle) {
1694 printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
1695 local_irq_restore(flags);
1696 return -1;
1697 }
1698
1699 /* 710: bit mapped scsi ID, async */
1700 dsa[0] = (1 << i) << 16;
1701 hostdata->idle = 0;
1702 hostdata->test_running = 2;
1703 hostdata->test_completed = -1;
1704 start = virt_to_bus(hostdata->script) + hostdata->E_test_2;
1705 hostdata->state = STATE_RUNNING;
1706 NCR53c7x0_write32 (DSA_REG, virt_to_bus(dsa));
1707 NCR53c7x0_write32 (DSP_REG, start);
1708 if (hostdata->options & OPTION_DEBUG_TRACE)
1709 NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl |
1710 DCNTL_SSM | DCNTL_STD);
1711 local_irq_restore(flags);
1712
1713 timeout = jiffies + 5 * HZ; /* arbitrary */
1714 while ((hostdata->test_completed == -1) && time_before(jiffies, timeout))
1715 barrier();
1716
1717 NCR53c7x0_write32 (DSA_REG, 0);
1718
1719 if (hostdata->test_completed == 2) {
1720 data[35] = 0;
1721 printk ("scsi%d : test 2 INQUIRY to target %d, lun 0 : %s\n",
1722 host->host_no, i, data + 8);
1723 printk ("scsi%d : status ", host->host_no);
1724 print_status (status);
1725 printk ("\nscsi%d : message ", host->host_no);
1726 print_msg (&msg);
1727 printk ("\n");
1728 } else if (hostdata->test_completed == 3) {
1729 printk("scsi%d : test 2 no connection with target %d\n",
1730 host->host_no, i);
1731 if (!hostdata->idle) {
1732 printk("scsi%d : not idle\n", host->host_no);
1733 local_irq_restore(flags);
1734 return -1;
1735 }
1736 } else if (hostdata->test_completed == -1) {
1737 printk ("scsi%d : test 2 timed out\n", host->host_no);
1738 local_irq_restore(flags);
1739 return -1;
1740 }
1741 hostdata->test_running = 0;
1742 }
1743 }
1744
1745 local_irq_restore(flags);
1746 return 0;
1747}
1748
1749/*
1750 * Function : static void NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd)
1751 *
1752 * Purpose : copy the NCR53c8xx dsa structure into cmd's dsa buffer,
1753 * performing all necessary relocation.
1754 *
1755 * Inputs : cmd, a NCR53c7x0_cmd structure with a dsa area large
1756 * enough to hold the NCR53c8xx dsa.
1757 */
1758
1759static void
1760NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd) {
1761 Scsi_Cmnd *c = cmd->cmd;
1762 struct Scsi_Host *host = c->device->host;
1763 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1764 host->hostdata[0];
1765 int i;
1766
1767 memcpy (cmd->dsa, hostdata->script + (hostdata->E_dsa_code_template / 4),
1768 hostdata->E_dsa_code_template_end - hostdata->E_dsa_code_template);
1769
1770 /*
1771 * Note : within the NCR 'C' code, dsa points to the _start_
1772 * of the DSA structure, and _not_ the offset of dsa_zero within
1773 * that structure used to facilitate shorter signed offsets
1774 * for the 8 bit ALU.
1775 *
1776 * The implications of this are that
1777 *
1778 * - 32 bit A_dsa_* absolute values require an additional
1779 * dsa_zero added to their value to be correct, since they are
1780 * relative to dsa_zero which is in essentially a separate
1781 * space from the code symbols.
1782 *
1783 * - All other symbols require no special treatment.
1784 */
1785
1786 patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1787 dsa_temp_lun, c->device->lun);
1788 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1789 dsa_temp_addr_next, virt_to_bus(&cmd->dsa_next_addr));
1790 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1791 dsa_temp_next, virt_to_bus(cmd->dsa) + Ent_dsa_zero -
1792 Ent_dsa_code_template + A_dsa_next);
1793 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1794 dsa_temp_sync, virt_to_bus((void *)hostdata->sync[c->device->id].script));
1795 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1796 dsa_sscf_710, virt_to_bus((void *)&hostdata->sync[c->device->id].sscf_710));
1797 patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1798 dsa_temp_target, 1 << c->device->id);
1799 /* XXX - new pointer stuff */
1800 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1801 dsa_temp_addr_saved_pointer, virt_to_bus(&cmd->saved_data_pointer));
1802 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1803 dsa_temp_addr_saved_residual, virt_to_bus(&cmd->saved_residual));
1804 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1805 dsa_temp_addr_residual, virt_to_bus(&cmd->residual));
1806
1807 /* XXX - new start stuff */
1808
1809 patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
1810 dsa_temp_addr_dsa_value, virt_to_bus(&cmd->dsa_addr));
1811}
1812
1813/*
1814 * Function : run_process_issue_queue (void)
1815 *
1816 * Purpose : insure that the coroutine is running and will process our
1817 * request. process_issue_queue_running is checked/set here (in an
1818 * inline function) rather than in process_issue_queue itself to reduce
1819 * the chances of stack overflow.
1820 *
1821 */
1822
1823static volatile int process_issue_queue_running = 0;
1824
1825static __inline__ void
1826run_process_issue_queue(void) {
1827 unsigned long flags;
1828 local_irq_save(flags);
1829 if (!process_issue_queue_running) {
1830 process_issue_queue_running = 1;
1831 process_issue_queue(flags);
1832 /*
1833 * process_issue_queue_running is cleared in process_issue_queue
1834 * once it can't do more work, and process_issue_queue exits with
1835 * interrupts disabled.
1836 */
1837 }
1838 local_irq_restore(flags);
1839}
1840
1841/*
1842 * Function : static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int
1843 * result)
1844 *
1845 * Purpose : mark SCSI command as finished, OR'ing the host portion
1846 * of the result word into the result field of the corresponding
1847 * Scsi_Cmnd structure, and removing it from the internal queues.
1848 *
1849 * Inputs : cmd - command, result - entire result field
1850 *
1851 * Preconditions : the NCR chip should be in a halted state when
1852 * abnormal_finished is run, since it modifies structures which
1853 * the NCR expects to have exclusive access to.
1854 */
1855
1856static void
1857abnormal_finished (struct NCR53c7x0_cmd *cmd, int result) {
1858 Scsi_Cmnd *c = cmd->cmd;
1859 struct Scsi_Host *host = c->device->host;
1860 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1861 host->hostdata[0];
1862 unsigned long flags;
1863 int left, found;
1864 volatile struct NCR53c7x0_cmd * linux_search;
1865 volatile struct NCR53c7x0_cmd * volatile *linux_prev;
1866 volatile u32 *ncr_prev, *ncrcurrent, ncr_search;
1867
1868#if 0
1869 printk ("scsi%d: abnormal finished\n", host->host_no);
1870#endif
1871
1872 local_irq_save(flags);
1873 found = 0;
1874 /*
1875 * Traverse the NCR issue array until we find a match or run out
1876 * of instructions. Instructions in the NCR issue array are
1877 * either JUMP or NOP instructions, which are 2 words in length.
1878 */
1879
1880
1881 for (found = 0, left = host->can_queue, ncrcurrent = hostdata->schedule;
1882 left > 0; --left, ncrcurrent += 2)
1883 {
1884 if (issue_to_cmd (host, hostdata, (u32 *) ncrcurrent) == cmd)
1885 {
1886 ncrcurrent[0] = hostdata->NOP_insn;
1887 ncrcurrent[1] = 0xdeadbeef;
1888 ++found;
1889 break;
1890 }
1891 }
1892
1893 /*
1894 * Traverse the NCR reconnect list of DSA structures until we find
1895 * a pointer to this dsa or have found too many command structures.
1896 * We let prev point at the next field of the previous element or
1897 * head of the list, so we don't do anything different for removing
1898 * the head element.
1899 */
1900
1901 for (left = host->can_queue,
1902 ncr_search = hostdata->reconnect_dsa_head,
1903 ncr_prev = &hostdata->reconnect_dsa_head;
1904 left >= 0 && ncr_search &&
1905 ((char*)bus_to_virt(ncr_search) + hostdata->dsa_start)
1906 != (char *) cmd->dsa;
1907 ncr_prev = (u32*) ((char*)bus_to_virt(ncr_search) +
1908 hostdata->dsa_next), ncr_search = *ncr_prev, --left);
1909
1910 if (left < 0)
1911 printk("scsi%d: loop detected in ncr reconncect list\n",
1912 host->host_no);
1913 else if (ncr_search) {
1914 if (found)
1915 printk("scsi%d: scsi %ld in ncr issue array and reconnect lists\n",
1916 host->host_no, c->pid);
1917 else {
1918 volatile u32 * next = (u32 *)
1919 ((char *)bus_to_virt(ncr_search) + hostdata->dsa_next);
1920 *ncr_prev = *next;
1921/* If we're at the tail end of the issue queue, update that pointer too. */
1922 found = 1;
1923 }
1924 }
1925
1926 /*
1927 * Traverse the host running list until we find this command or discover
1928 * we have too many elements, pointing linux_prev at the next field of the
1929 * linux_previous element or head of the list, search at this element.
1930 */
1931
1932 for (left = host->can_queue, linux_search = hostdata->running_list,
1933 linux_prev = &hostdata->running_list;
1934 left >= 0 && linux_search && linux_search != cmd;
1935 linux_prev = &(linux_search->next),
1936 linux_search = linux_search->next, --left);
1937
1938 if (left < 0)
1939 printk ("scsi%d: loop detected in host running list for scsi pid %ld\n",
1940 host->host_no, c->pid);
1941 else if (linux_search) {
1942 *linux_prev = linux_search->next;
1943 --hostdata->busy[c->device->id][c->device->lun];
1944 }
1945
1946 /* Return the NCR command structure to the free list */
1947 cmd->next = hostdata->free;
1948 hostdata->free = cmd;
1949 c->host_scribble = NULL;
1950
1951 /* And return */
1952 c->result = result;
1953 c->scsi_done(c);
1954
1955 local_irq_restore(flags);
1956 run_process_issue_queue();
1957}
1958
1959/*
1960 * Function : static void intr_break (struct Scsi_Host *host,
1961 * struct NCR53c7x0_cmd *cmd)
1962 *
1963 * Purpose : Handler for breakpoint interrupts from a SCSI script
1964 *
1965 * Inputs : host - pointer to this host adapter's structure,
1966 * cmd - pointer to the command (if any) dsa was pointing
1967 * to.
1968 *
1969 */
1970
1971static void
1972intr_break (struct Scsi_Host *host, struct
1973 NCR53c7x0_cmd *cmd) {
1974 NCR53c7x0_local_declare();
1975 struct NCR53c7x0_break *bp;
1976#if 0
1977 Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
1978#endif
1979 u32 *dsp;
1980 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1981 host->hostdata[0];
1982 unsigned long flags;
1983 NCR53c7x0_local_setup(host);
1984
1985 /*
1986 * Find the break point corresponding to this address, and
1987 * dump the appropriate debugging information to standard
1988 * output.
1989 */
1990 local_irq_save(flags);
1991 dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
1992 for (bp = hostdata->breakpoints; bp && bp->address != dsp;
1993 bp = bp->next);
1994 if (!bp)
1995 panic("scsi%d : break point interrupt from %p with no breakpoint!",
1996 host->host_no, dsp);
1997
1998 /*
1999 * Configure the NCR chip for manual start mode, so that we can
2000 * point the DSP register at the instruction that follows the
2001 * INT int_debug_break instruction.
2002 */
2003
2004 NCR53c7x0_write8 (hostdata->dmode,
2005 NCR53c7x0_read8(hostdata->dmode)|DMODE_MAN);
2006
2007 /*
2008 * And update the DSP register, using the size of the old
2009 * instruction in bytes.
2010 */
2011
2012 local_irq_restore(flags);
2013}
2014/*
2015 * Function : static void print_synchronous (const char *prefix,
2016 * const unsigned char *msg)
2017 *
2018 * Purpose : print a pretty, user and machine parsable representation
2019 * of a SDTR message, including the "real" parameters, data
2020 * clock so we can tell transfer rate at a glance.
2021 *
2022 * Inputs ; prefix - text to prepend, msg - SDTR message (5 bytes)
2023 */
2024
2025static void
2026print_synchronous (const char *prefix, const unsigned char *msg) {
2027 if (msg[4]) {
2028 int Hz = 1000000000 / (msg[3] * 4);
2029 int integer = Hz / 1000000;
2030 int fraction = (Hz - (integer * 1000000)) / 10000;
2031 printk ("%speriod %dns offset %d %d.%02dMHz %s SCSI%s\n",
2032 prefix, (int) msg[3] * 4, (int) msg[4], integer, fraction,
2033 (((msg[3] * 4) < 200) ? "FAST" : "synchronous"),
2034 (((msg[3] * 4) < 200) ? "-II" : ""));
2035 } else
2036 printk ("%sasynchronous SCSI\n", prefix);
2037}
2038
2039/*
2040 * Function : static void set_synchronous (struct Scsi_Host *host,
2041 * int target, int sxfer, int scntl3, int now_connected)
2042 *
2043 * Purpose : reprogram transfers between the selected SCSI initiator and
2044 * target with the given register values; in the indirect
2045 * select operand, reselection script, and chip registers.
2046 *
2047 * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
2048 * sxfer and scntl3 - NCR registers. now_connected - if non-zero,
2049 * we should reprogram the registers now too.
2050 *
2051 * NOTE: For 53c710, scntl3 is actually used for SCF bits from
2052 * SBCL, as we don't have a SCNTL3.
2053 */
2054
2055static void
2056set_synchronous (struct Scsi_Host *host, int target, int sxfer, int scntl3,
2057 int now_connected) {
2058 NCR53c7x0_local_declare();
2059 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2060 host->hostdata[0];
2061 u32 *script;
2062 NCR53c7x0_local_setup(host);
2063
2064 /* These are eight bit registers */
2065 sxfer &= 0xff;
2066 scntl3 &= 0xff;
2067
2068 hostdata->sync[target].sxfer_sanity = sxfer;
2069 hostdata->sync[target].scntl3_sanity = scntl3;
2070
2071/*
2072 * HARD CODED : synchronous script is EIGHT words long. This
2073 * must agree with 53c7.8xx.h
2074 */
2075
2076 if ((hostdata->chip != 700) && (hostdata->chip != 70066)) {
2077 hostdata->sync[target].select_indirect = (1 << target) << 16 |
2078 (sxfer << 8);
2079 hostdata->sync[target].sscf_710 = scntl3;
2080
2081 script = (u32 *) hostdata->sync[target].script;
2082
2083 /* XXX - add NCR53c7x0 code to reprogram SCF bits if we want to */
2084 script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
2085 DCMD_RWRI_OP_MOVE) << 24) |
2086 (SBCL_REG << 16) | (scntl3 << 8);
2087 script[1] = 0;
2088 script += 2;
2089
2090 script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
2091 DCMD_RWRI_OP_MOVE) << 24) |
2092 (SXFER_REG << 16) | (sxfer << 8);
2093 script[1] = 0;
2094 script += 2;
2095
2096#ifdef DEBUG_SYNC_INTR
2097 if (hostdata->options & OPTION_DEBUG_DISCONNECT) {
2098 script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_INT) << 24) | DBC_TCI_TRUE;
2099 script[1] = DEBUG_SYNC_INTR;
2100 script += 2;
2101 }
2102#endif
2103
2104 script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_RETURN) << 24) | DBC_TCI_TRUE;
2105 script[1] = 0;
2106 script += 2;
2107 }
2108
2109 if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS)
2110 printk ("scsi%d : target %d sync parameters are sxfer=0x%x, scntl3=0x%x\n",
2111 host->host_no, target, sxfer, scntl3);
2112
2113 if (now_connected) {
2114 NCR53c7x0_write8(SBCL_REG, scntl3);
2115 NCR53c7x0_write8(SXFER_REG, sxfer);
2116 }
2117}
2118
2119
2120/*
2121 * Function : static int asynchronous (struct Scsi_Host *host, int target)
2122 *
2123 * Purpose : reprogram between the selected SCSI Host adapter and target
2124 * (assumed to be currently connected) for asynchronous transfers.
2125 *
2126 * Inputs : host - SCSI host structure, target - numeric target ID.
2127 *
2128 * Preconditions : the NCR chip should be in one of the halted states
2129 */
2130
2131static void
2132asynchronous (struct Scsi_Host *host, int target) {
2133 NCR53c7x0_local_declare();
2134 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2135 host->hostdata[0];
2136 NCR53c7x0_local_setup(host);
2137 set_synchronous (host, target, /* no offset */ 0, hostdata->saved_scntl3,
2138 1);
2139 printk ("scsi%d : setting target %d to asynchronous SCSI\n",
2140 host->host_no, target);
2141}
2142
2143/*
2144 * XXX - do we want to go out of our way (ie, add extra code to selection
2145 * in the NCR53c710/NCR53c720 script) to reprogram the synchronous
2146 * conversion bits, or can we be content in just setting the
2147 * sxfer bits? I chose to do so [richard@sleepie.demon.co.uk]
2148 */
2149
2150/* Table for NCR53c8xx synchronous values */
2151
2152/* This table is also correct for 710, allowing that scf=4 is equivalent
2153 * of SSCF=0 (ie use DCNTL, divide by 3) for a 50.01-66.00MHz clock.
2154 * For any other clock values, we cannot use entries with SCF values of
2155 * 4. I guess that for a 66MHz clock, the slowest it will set is 2MHz,
2156 * and for a 50MHz clock, the slowest will be 2.27Mhz. Should check
2157 * that a device doesn't try and negotiate sync below these limits!
2158 */
2159
2160static const struct {
2161 int div; /* Total clock divisor * 10 */
2162 unsigned char scf; /* */
2163 unsigned char tp; /* 4 + tp = xferp divisor */
2164} syncs[] = {
2165/* div scf tp div scf tp div scf tp */
2166 { 40, 1, 0}, { 50, 1, 1}, { 60, 1, 2},
2167 { 70, 1, 3}, { 75, 2, 1}, { 80, 1, 4},
2168 { 90, 1, 5}, { 100, 1, 6}, { 105, 2, 3},
2169 { 110, 1, 7}, { 120, 2, 4}, { 135, 2, 5},
2170 { 140, 3, 3}, { 150, 2, 6}, { 160, 3, 4},
2171 { 165, 2, 7}, { 180, 3, 5}, { 200, 3, 6},
2172 { 210, 4, 3}, { 220, 3, 7}, { 240, 4, 4},
2173 { 270, 4, 5}, { 300, 4, 6}, { 330, 4, 7}
2174};
2175
2176/*
2177 * Function : static void synchronous (struct Scsi_Host *host, int target,
2178 * char *msg)
2179 *
2180 * Purpose : reprogram transfers between the selected SCSI initiator and
2181 * target for synchronous SCSI transfers such that the synchronous
2182 * offset is less than that requested and period at least as long
2183 * as that requested. Also modify *msg such that it contains
2184 * an appropriate response.
2185 *
2186 * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
2187 * msg - synchronous transfer request.
2188 */
2189
2190
2191static void
2192synchronous (struct Scsi_Host *host, int target, char *msg) {
2193 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2194 host->hostdata[0];
2195 int desire, divisor, i, limit;
2196 unsigned char scntl3, sxfer;
2197/* The diagnostic message fits on one line, even with max. width integers */
2198 char buf[80];
2199
2200/* Desired transfer clock in Hz */
2201 desire = 1000000000L / (msg[3] * 4);
2202/* Scale the available SCSI clock by 10 so we get tenths */
2203 divisor = (hostdata->scsi_clock * 10) / desire;
2204
2205/* NCR chips can handle at most an offset of 8 */
2206 if (msg[4] > 8)
2207 msg[4] = 8;
2208
2209 if (hostdata->options & OPTION_DEBUG_SDTR)
2210 printk("scsi%d : optimal synchronous divisor of %d.%01d\n",
2211 host->host_no, divisor / 10, divisor % 10);
2212
2213 limit = (sizeof(syncs) / sizeof(syncs[0]) -1);
2214 for (i = 0; (i < limit) && (divisor > syncs[i].div); ++i);
2215
2216 if (hostdata->options & OPTION_DEBUG_SDTR)
2217 printk("scsi%d : selected synchronous divisor of %d.%01d\n",
2218 host->host_no, syncs[i].div / 10, syncs[i].div % 10);
2219
2220 msg[3] = ((1000000000L / hostdata->scsi_clock) * syncs[i].div / 10 / 4);
2221
2222 if (hostdata->options & OPTION_DEBUG_SDTR)
2223 printk("scsi%d : selected synchronous period of %dns\n", host->host_no,
2224 msg[3] * 4);
2225
2226 scntl3 = syncs[i].scf;
2227 sxfer = (msg[4] << SXFER_MO_SHIFT) | (syncs[i].tp << 4);
2228 if (hostdata->options & OPTION_DEBUG_SDTR)
2229 printk ("scsi%d : sxfer=0x%x scntl3=0x%x\n",
2230 host->host_no, (int) sxfer, (int) scntl3);
2231 set_synchronous (host, target, sxfer, scntl3, 1);
2232 sprintf (buf, "scsi%d : setting target %d to ", host->host_no, target);
2233 print_synchronous (buf, msg);
2234}
2235
2236/*
2237 * Function : static int NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host,
2238 * struct NCR53c7x0_cmd *cmd)
2239 *
2240 * Purpose : Handler for INT generated instructions for the
2241 * NCR53c810/820 SCSI SCRIPT
2242 *
2243 * Inputs : host - pointer to this host adapter's structure,
2244 * cmd - pointer to the command (if any) dsa was pointing
2245 * to.
2246 *
2247 */
2248
2249static int
2250NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host, struct
2251 NCR53c7x0_cmd *cmd) {
2252 NCR53c7x0_local_declare();
2253 int print;
2254 Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
2255 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2256 host->hostdata[0];
2257 u32 dsps,*dsp; /* Argument of the INT instruction */
2258
2259 NCR53c7x0_local_setup(host);
2260 dsps = NCR53c7x0_read32(DSPS_REG);
2261 dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
2262
2263 /* RGH 150597: Frig. Commands which fail with Check Condition are
2264 * Flagged as successful - hack dsps to indicate check condition */
2265#if 0
2266 /* RGH 200597: Need to disable for BVME6000, as it gets Check Conditions
2267 * and then dies. Seems to handle Check Condition at startup, but
2268 * not mid kernel build. */
2269 if (dsps == A_int_norm_emulateintfly && cmd && cmd->result == 2)
2270 dsps = A_int_err_check_condition;
2271#endif
2272
2273 if (hostdata->options & OPTION_DEBUG_INTR)
2274 printk ("scsi%d : DSPS = 0x%x\n", host->host_no, dsps);
2275
2276 switch (dsps) {
2277 case A_int_msg_1:
2278 print = 1;
2279 switch (hostdata->msg_buf[0]) {
2280 /*
2281 * Unless we've initiated synchronous negotiation, I don't
2282 * think that this should happen.
2283 */
2284 case MESSAGE_REJECT:
2285 hostdata->dsp = hostdata->script + hostdata->E_accept_message /
2286 sizeof(u32);
2287 hostdata->dsp_changed = 1;
2288 if (cmd && (cmd->flags & CMD_FLAG_SDTR)) {
2289 printk ("scsi%d : target %d rejected SDTR\n", host->host_no,
2290 c->device->id);
2291 cmd->flags &= ~CMD_FLAG_SDTR;
2292 asynchronous (host, c->device->id);
2293 print = 0;
2294 }
2295 break;
2296 case INITIATE_RECOVERY:
2297 printk ("scsi%d : extended contingent allegiance not supported yet, rejecting\n",
2298 host->host_no);
2299 /* Fall through to default */
2300 hostdata->dsp = hostdata->script + hostdata->E_reject_message /
2301 sizeof(u32);
2302 hostdata->dsp_changed = 1;
2303 break;
2304 default:
2305 printk ("scsi%d : unsupported message, rejecting\n",
2306 host->host_no);
2307 hostdata->dsp = hostdata->script + hostdata->E_reject_message /
2308 sizeof(u32);
2309 hostdata->dsp_changed = 1;
2310 }
2311 if (print) {
2312 printk ("scsi%d : received message", host->host_no);
2313 if (c)
2314 printk (" from target %d lun %d ", c->device->id, c->device->lun);
2315 print_msg ((unsigned char *) hostdata->msg_buf);
2316 printk("\n");
2317 }
2318
2319 return SPECIFIC_INT_NOTHING;
2320
2321
2322 case A_int_msg_sdtr:
2323/*
2324 * At this point, hostdata->msg_buf contains
2325 * 0 EXTENDED MESSAGE
2326 * 1 length
2327 * 2 SDTR
2328 * 3 period * 4ns
2329 * 4 offset
2330 */
2331
2332 if (cmd) {
2333 char buf[80];
2334 sprintf (buf, "scsi%d : target %d %s ", host->host_no, c->device->id,
2335 (cmd->flags & CMD_FLAG_SDTR) ? "accepting" : "requesting");
2336 print_synchronous (buf, (unsigned char *) hostdata->msg_buf);
2337
2338 /*
2339 * Initiator initiated, won't happen unless synchronous
2340 * transfers are enabled. If we get a SDTR message in
2341 * response to our SDTR, we should program our parameters
2342 * such that
2343 * offset <= requested offset
2344 * period >= requested period
2345 */
2346 if (cmd->flags & CMD_FLAG_SDTR) {
2347 cmd->flags &= ~CMD_FLAG_SDTR;
2348 if (hostdata->msg_buf[4])
2349 synchronous (host, c->device->id, (unsigned char *)
2350 hostdata->msg_buf);
2351 else
2352 asynchronous (host, c->device->id);
2353 hostdata->dsp = hostdata->script + hostdata->E_accept_message /
2354 sizeof(u32);
2355 hostdata->dsp_changed = 1;
2356 return SPECIFIC_INT_NOTHING;
2357 } else {
2358 if (hostdata->options & OPTION_SYNCHRONOUS) {
2359 cmd->flags |= CMD_FLAG_DID_SDTR;
2360 synchronous (host, c->device->id, (unsigned char *)
2361 hostdata->msg_buf);
2362 } else {
2363 hostdata->msg_buf[4] = 0; /* 0 offset = async */
2364 asynchronous (host, c->device->id);
2365 }
2366 patch_dsa_32 (cmd->dsa, dsa_msgout_other, 0, 5);
2367 patch_dsa_32 (cmd->dsa, dsa_msgout_other, 1, (u32)
2368 virt_to_bus ((void *)&hostdata->msg_buf));
2369 hostdata->dsp = hostdata->script +
2370 hostdata->E_respond_message / sizeof(u32);
2371 hostdata->dsp_changed = 1;
2372 }
2373 return SPECIFIC_INT_NOTHING;
2374 }
2375 /* Fall through to abort if we couldn't find a cmd, and
2376 therefore a dsa structure to twiddle */
2377 case A_int_msg_wdtr:
2378 hostdata->dsp = hostdata->script + hostdata->E_reject_message /
2379 sizeof(u32);
2380 hostdata->dsp_changed = 1;
2381 return SPECIFIC_INT_NOTHING;
2382 case A_int_err_unexpected_phase:
2383 if (hostdata->options & OPTION_DEBUG_INTR)
2384 printk ("scsi%d : unexpected phase\n", host->host_no);
2385 return SPECIFIC_INT_ABORT;
2386 case A_int_err_selected:
2387 if ((hostdata->chip / 100) == 8)
2388 printk ("scsi%d : selected by target %d\n", host->host_no,
2389 (int) NCR53c7x0_read8(SDID_REG_800) &7);
2390 else
2391 printk ("scsi%d : selected by target LCRC=0x%02x\n", host->host_no,
2392 (int) NCR53c7x0_read8(LCRC_REG_10));
2393 hostdata->dsp = hostdata->script + hostdata->E_target_abort /
2394 sizeof(u32);
2395 hostdata->dsp_changed = 1;
2396 return SPECIFIC_INT_NOTHING;
2397 case A_int_err_unexpected_reselect:
2398 if ((hostdata->chip / 100) == 8)
2399 printk ("scsi%d : unexpected reselect by target %d lun %d\n",
2400 host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & 7,
2401 hostdata->reselected_identify & 7);
2402 else
2403 printk ("scsi%d : unexpected reselect LCRC=0x%02x\n", host->host_no,
2404 (int) NCR53c7x0_read8(LCRC_REG_10));
2405 hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
2406 sizeof(u32);
2407 hostdata->dsp_changed = 1;
2408 return SPECIFIC_INT_NOTHING;
2409/*
2410 * Since contingent allegiance conditions are cleared by the next
2411 * command issued to a target, we must issue a REQUEST SENSE
2412 * command after receiving a CHECK CONDITION status, before
2413 * another command is issued.
2414 *
2415 * Since this NCR53c7x0_cmd will be freed after use, we don't
2416 * care if we step on the various fields, so modify a few things.
2417 */
2418 case A_int_err_check_condition:
2419#if 0
2420 if (hostdata->options & OPTION_DEBUG_INTR)
2421#endif
2422 printk ("scsi%d : CHECK CONDITION\n", host->host_no);
2423 if (!c) {
2424 printk("scsi%d : CHECK CONDITION with no SCSI command\n",
2425 host->host_no);
2426 return SPECIFIC_INT_PANIC;
2427 }
2428
2429 /*
2430 * FIXME : this uses the normal one-byte selection message.
2431 * We may want to renegotiate for synchronous & WIDE transfers
2432 * since these could be the crux of our problem.
2433 *
2434 hostdata->NOP_insn* FIXME : once SCSI-II tagged queuing is implemented, we'll
2435 * have to set this up so that the rest of the DSA
2436 * agrees with this being an untagged queue'd command.
2437 */
2438
2439 patch_dsa_32 (cmd->dsa, dsa_msgout, 0, 1);
2440
2441 /*
2442 * Modify the table indirect for COMMAND OUT phase, since
2443 * Request Sense is a six byte command.
2444 */
2445
2446 patch_dsa_32 (cmd->dsa, dsa_cmdout, 0, 6);
2447
2448 /*
2449 * The CDB is now mirrored in our local non-cached
2450 * structure, but keep the old structure up to date as well,
2451 * just in case anyone looks at it.
2452 */
2453
2454 /*
2455 * XXX Need to worry about data buffer alignment/cache state
2456 * XXX here, but currently never get A_int_err_check_condition,
2457 * XXX so ignore problem for now.
2458 */
2459 cmd->cmnd[0] = c->cmnd[0] = REQUEST_SENSE;
2460 cmd->cmnd[0] = c->cmnd[1] &= 0xe0; /* Zero all but LUN */
2461 cmd->cmnd[0] = c->cmnd[2] = 0;
2462 cmd->cmnd[0] = c->cmnd[3] = 0;
2463 cmd->cmnd[0] = c->cmnd[4] = sizeof(c->sense_buffer);
2464 cmd->cmnd[0] = c->cmnd[5] = 0;
2465
2466 /*
2467 * Disable dataout phase, and program datain to transfer to the
2468 * sense buffer, and add a jump to other_transfer after the
2469 * command so overflow/underrun conditions are detected.
2470 */
2471
2472 patch_dsa_32 (cmd->dsa, dsa_dataout, 0,
2473 virt_to_bus(hostdata->script) + hostdata->E_other_transfer);
2474 patch_dsa_32 (cmd->dsa, dsa_datain, 0,
2475 virt_to_bus(cmd->data_transfer_start));
2476 cmd->data_transfer_start[0] = (((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I |
2477 DCMD_BMI_IO)) << 24) | sizeof(c->sense_buffer);
2478 cmd->data_transfer_start[1] = (u32) virt_to_bus(c->sense_buffer);
2479
2480 cmd->data_transfer_start[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP)
2481 << 24) | DBC_TCI_TRUE;
2482 cmd->data_transfer_start[3] = (u32) virt_to_bus(hostdata->script) +
2483 hostdata->E_other_transfer;
2484
2485 /*
2486 * Currently, this command is flagged as completed, ie
2487 * it has valid status and message data. Reflag it as
2488 * incomplete. Q - need to do something so that original
2489 * status, etc are used.
2490 */
2491
2492 cmd->result = cmd->cmd->result = 0xffff;
2493
2494 /*
2495 * Restart command as a REQUEST SENSE.
2496 */
2497 hostdata->dsp = (u32 *) hostdata->script + hostdata->E_select /
2498 sizeof(u32);
2499 hostdata->dsp_changed = 1;
2500 return SPECIFIC_INT_NOTHING;
2501 case A_int_debug_break:
2502 return SPECIFIC_INT_BREAK;
2503 case A_int_norm_aborted:
2504 hostdata->dsp = (u32 *) hostdata->schedule;
2505 hostdata->dsp_changed = 1;
2506 if (cmd)
2507 abnormal_finished (cmd, DID_ERROR << 16);
2508 return SPECIFIC_INT_NOTHING;
2509 case A_int_norm_emulateintfly:
2510 NCR53c7x0_intfly(host);
2511 return SPECIFIC_INT_NOTHING;
2512 case A_int_test_1:
2513 case A_int_test_2:
2514 hostdata->idle = 1;
2515 hostdata->test_completed = (dsps - A_int_test_1) / 0x00010000 + 1;
2516 if (hostdata->options & OPTION_DEBUG_INTR)
2517 printk("scsi%d : test%d complete\n", host->host_no,
2518 hostdata->test_completed);
2519 return SPECIFIC_INT_NOTHING;
2520#ifdef A_int_debug_reselected_ok
2521 case A_int_debug_reselected_ok:
2522 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2523 OPTION_DEBUG_DISCONNECT)) {
2524 /*
2525 * Note - this dsa is not based on location relative to
2526 * the command structure, but to location relative to the
2527 * DSA register
2528 */
2529 u32 *dsa;
2530 dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
2531
2532 printk("scsi%d : reselected_ok (DSA = 0x%x (virt 0x%p)\n",
2533 host->host_no, NCR53c7x0_read32(DSA_REG), dsa);
2534 printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
2535 host->host_no, cmd->saved_data_pointer,
2536 bus_to_virt(cmd->saved_data_pointer));
2537 print_insn (host, hostdata->script + Ent_reselected_ok /
2538 sizeof(u32), "", 1);
2539 if ((hostdata->chip / 100) == 8)
2540 printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
2541 host->host_no, NCR53c7x0_read8(SXFER_REG),
2542 NCR53c7x0_read8(SCNTL3_REG_800));
2543 else
2544 printk ("scsi%d : sxfer=0x%x, cannot read SBCL\n",
2545 host->host_no, NCR53c7x0_read8(SXFER_REG));
2546 if (c) {
2547 print_insn (host, (u32 *)
2548 hostdata->sync[c->device->id].script, "", 1);
2549 print_insn (host, (u32 *)
2550 hostdata->sync[c->device->id].script + 2, "", 1);
2551 }
2552 }
2553 return SPECIFIC_INT_RESTART;
2554#endif
2555#ifdef A_int_debug_reselect_check
2556 case A_int_debug_reselect_check:
2557 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2558 u32 *dsa;
2559#if 0
2560 u32 *code;
2561#endif
2562 /*
2563 * Note - this dsa is not based on location relative to
2564 * the command structure, but to location relative to the
2565 * DSA register
2566 */
2567 dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
2568 printk("scsi%d : reselected_check_next (DSA = 0x%lx (virt 0x%p))\n",
2569 host->host_no, virt_to_bus(dsa), dsa);
2570 if (dsa) {
2571 printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
2572 host->host_no, cmd->saved_data_pointer,
2573 bus_to_virt (cmd->saved_data_pointer));
2574#if 0
2575 printk("scsi%d : template code :\n", host->host_no);
2576 for (code = dsa + (Ent_dsa_code_check_reselect - Ent_dsa_zero)
2577 / sizeof(u32); code < (dsa + Ent_dsa_zero / sizeof(u32));
2578 code += print_insn (host, code, "", 1));
2579#endif
2580 }
2581 print_insn (host, hostdata->script + Ent_reselected_ok /
2582 sizeof(u32), "", 1);
2583 }
2584 return SPECIFIC_INT_RESTART;
2585#endif
2586#ifdef A_int_debug_dsa_schedule
2587 case A_int_debug_dsa_schedule:
2588 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2589 u32 *dsa;
2590 /*
2591 * Note - this dsa is not based on location relative to
2592 * the command structure, but to location relative to the
2593 * DSA register
2594 */
2595 dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
2596 printk("scsi%d : dsa_schedule (old DSA = 0x%lx (virt 0x%p))\n",
2597 host->host_no, virt_to_bus(dsa), dsa);
2598 if (dsa)
2599 printk("scsi%d : resume address is 0x%x (virt 0x%p)\n"
2600 " (temp was 0x%x (virt 0x%p))\n",
2601 host->host_no, cmd->saved_data_pointer,
2602 bus_to_virt (cmd->saved_data_pointer),
2603 NCR53c7x0_read32 (TEMP_REG),
2604 bus_to_virt (NCR53c7x0_read32(TEMP_REG)));
2605 }
2606 return SPECIFIC_INT_RESTART;
2607#endif
2608#ifdef A_int_debug_scheduled
2609 case A_int_debug_scheduled:
2610 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2611 printk("scsi%d : new I/O 0x%x (virt 0x%p) scheduled\n",
2612 host->host_no, NCR53c7x0_read32(DSA_REG),
2613 bus_to_virt(NCR53c7x0_read32(DSA_REG)));
2614 }
2615 return SPECIFIC_INT_RESTART;
2616#endif
2617#ifdef A_int_debug_idle
2618 case A_int_debug_idle:
2619 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2620 printk("scsi%d : idle\n", host->host_no);
2621 }
2622 return SPECIFIC_INT_RESTART;
2623#endif
2624#ifdef A_int_debug_cmd
2625 case A_int_debug_cmd:
2626 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2627 printk("scsi%d : command sent\n");
2628 }
2629 return SPECIFIC_INT_RESTART;
2630#endif
2631#ifdef A_int_debug_dsa_loaded
2632 case A_int_debug_dsa_loaded:
2633 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2634 printk("scsi%d : DSA loaded with 0x%x (virt 0x%p)\n", host->host_no,
2635 NCR53c7x0_read32(DSA_REG),
2636 bus_to_virt(NCR53c7x0_read32(DSA_REG)));
2637 }
2638 return SPECIFIC_INT_RESTART;
2639#endif
2640#ifdef A_int_debug_reselected
2641 case A_int_debug_reselected:
2642 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2643 OPTION_DEBUG_DISCONNECT)) {
2644 if ((hostdata->chip / 100) == 8)
2645 printk("scsi%d : reselected by target %d lun %d\n",
2646 host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & ~0x80,
2647 (int) hostdata->reselected_identify & 7);
2648 else
2649 printk("scsi%d : reselected by LCRC=0x%02x lun %d\n",
2650 host->host_no, (int) NCR53c7x0_read8(LCRC_REG_10),
2651 (int) hostdata->reselected_identify & 7);
2652 print_queues(host);
2653 }
2654 return SPECIFIC_INT_RESTART;
2655#endif
2656#ifdef A_int_debug_disconnect_msg
2657 case A_int_debug_disconnect_msg:
2658 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
2659 if (c)
2660 printk("scsi%d : target %d lun %d disconnecting\n",
2661 host->host_no, c->device->id, c->device->lun);
2662 else
2663 printk("scsi%d : unknown target disconnecting\n",
2664 host->host_no);
2665 }
2666 return SPECIFIC_INT_RESTART;
2667#endif
2668#ifdef A_int_debug_disconnected
2669 case A_int_debug_disconnected:
2670 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2671 OPTION_DEBUG_DISCONNECT)) {
2672 printk ("scsi%d : disconnected, new queues are\n",
2673 host->host_no);
2674 print_queues(host);
2675#if 0
2676 /* Not valid on ncr53c710! */
2677 printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
2678 host->host_no, NCR53c7x0_read8(SXFER_REG),
2679 NCR53c7x0_read8(SCNTL3_REG_800));
2680#endif
2681 if (c) {
2682 print_insn (host, (u32 *)
2683 hostdata->sync[c->device->id].script, "", 1);
2684 print_insn (host, (u32 *)
2685 hostdata->sync[c->device->id].script + 2, "", 1);
2686 }
2687 }
2688 return SPECIFIC_INT_RESTART;
2689#endif
2690#ifdef A_int_debug_panic
2691 case A_int_debug_panic:
2692 printk("scsi%d : int_debug_panic received\n", host->host_no);
2693 print_lots (host);
2694 return SPECIFIC_INT_PANIC;
2695#endif
2696#ifdef A_int_debug_saved
2697 case A_int_debug_saved:
2698 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2699 OPTION_DEBUG_DISCONNECT)) {
2700 printk ("scsi%d : saved data pointer 0x%x (virt 0x%p)\n",
2701 host->host_no, cmd->saved_data_pointer,
2702 bus_to_virt (cmd->saved_data_pointer));
2703 print_progress (c);
2704 }
2705 return SPECIFIC_INT_RESTART;
2706#endif
2707#ifdef A_int_debug_restored
2708 case A_int_debug_restored:
2709 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2710 OPTION_DEBUG_DISCONNECT)) {
2711 if (cmd) {
2712 int size;
2713 printk ("scsi%d : restored data pointer 0x%x (virt 0x%p)\n",
2714 host->host_no, cmd->saved_data_pointer, bus_to_virt (
2715 cmd->saved_data_pointer));
2716 size = print_insn (host, (u32 *)
2717 bus_to_virt(cmd->saved_data_pointer), "", 1);
2718 size = print_insn (host, (u32 *)
2719 bus_to_virt(cmd->saved_data_pointer) + size, "", 1);
2720 print_progress (c);
2721 }
2722#if 0
2723 printk ("scsi%d : datapath residual %d\n",
2724 host->host_no, datapath_residual (host)) ;
2725#endif
2726 }
2727 return SPECIFIC_INT_RESTART;
2728#endif
2729#ifdef A_int_debug_sync
2730 case A_int_debug_sync:
2731 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2732 OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
2733 unsigned char sxfer = NCR53c7x0_read8 (SXFER_REG), scntl3;
2734 if ((hostdata->chip / 100) == 8) {
2735 scntl3 = NCR53c7x0_read8 (SCNTL3_REG_800);
2736 if (c) {
2737 if (sxfer != hostdata->sync[c->device->id].sxfer_sanity ||
2738 scntl3 != hostdata->sync[c->device->id].scntl3_sanity) {
2739 printk ("scsi%d : sync sanity check failed sxfer=0x%x, scntl3=0x%x",
2740 host->host_no, sxfer, scntl3);
2741 NCR53c7x0_write8 (SXFER_REG, sxfer);
2742 NCR53c7x0_write8 (SCNTL3_REG_800, scntl3);
2743 }
2744 } else
2745 printk ("scsi%d : unknown command sxfer=0x%x, scntl3=0x%x\n",
2746 host->host_no, (int) sxfer, (int) scntl3);
2747 } else {
2748 if (c) {
2749 if (sxfer != hostdata->sync[c->device->id].sxfer_sanity) {
2750 printk ("scsi%d : sync sanity check failed sxfer=0x%x",
2751 host->host_no, sxfer);
2752 NCR53c7x0_write8 (SXFER_REG, sxfer);
2753 NCR53c7x0_write8 (SBCL_REG,
2754 hostdata->sync[c->device->id].sscf_710);
2755 }
2756 } else
2757 printk ("scsi%d : unknown command sxfer=0x%x\n",
2758 host->host_no, (int) sxfer);
2759 }
2760 }
2761 return SPECIFIC_INT_RESTART;
2762#endif
2763#ifdef A_int_debug_datain
2764 case A_int_debug_datain:
2765 if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
2766 OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
2767 int size;
2768 if ((hostdata->chip / 100) == 8)
2769 printk ("scsi%d : In do_datain (%s) sxfer=0x%x, scntl3=0x%x\n"
2770 " datapath residual=%d\n",
2771 host->host_no, sbcl_to_phase (NCR53c7x0_read8 (SBCL_REG)),
2772 (int) NCR53c7x0_read8(SXFER_REG),
2773 (int) NCR53c7x0_read8(SCNTL3_REG_800),
2774 datapath_residual (host)) ;
2775 else
2776 printk ("scsi%d : In do_datain (%s) sxfer=0x%x\n"
2777 " datapath residual=%d\n",
2778 host->host_no, sbcl_to_phase (NCR53c7x0_read8 (SBCL_REG)),
2779 (int) NCR53c7x0_read8(SXFER_REG),
2780 datapath_residual (host)) ;
2781 print_insn (host, dsp, "", 1);
2782 size = print_insn (host, (u32 *) bus_to_virt(dsp[1]), "", 1);
2783 print_insn (host, (u32 *) bus_to_virt(dsp[1]) + size, "", 1);
2784 }
2785 return SPECIFIC_INT_RESTART;
2786#endif
2787#ifdef A_int_debug_check_dsa
2788 case A_int_debug_check_dsa:
2789 if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
2790 int sdid;
2791 int tmp;
2792 char *where;
2793 if (hostdata->chip / 100 == 8)
2794 sdid = NCR53c7x0_read8 (SDID_REG_800) & 15;
2795 else {
2796 tmp = NCR53c7x0_read8 (SDID_REG_700);
2797 if (!tmp)
2798 panic ("SDID_REG_700 = 0");
2799 tmp >>= 1;
2800 sdid = 0;
2801 while (tmp) {
2802 tmp >>= 1;
2803 sdid++;
2804 }
2805 }
2806 where = dsp - NCR53c7x0_insn_size(NCR53c7x0_read8
2807 (DCMD_REG)) == hostdata->script +
2808 Ent_select_check_dsa / sizeof(u32) ?
2809 "selection" : "reselection";
2810 if (c && sdid != c->device->id) {
2811 printk ("scsi%d : SDID target %d != DSA target %d at %s\n",
2812 host->host_no, sdid, c->device->id, where);
2813 print_lots(host);
2814 dump_events (host, 20);
2815 return SPECIFIC_INT_PANIC;
2816 }
2817 }
2818 return SPECIFIC_INT_RESTART;
2819#endif
2820 default:
2821 if ((dsps & 0xff000000) == 0x03000000) {
2822 printk ("scsi%d : misc debug interrupt 0x%x\n",
2823 host->host_no, dsps);
2824 return SPECIFIC_INT_RESTART;
2825 } else if ((dsps & 0xff000000) == 0x05000000) {
2826 if (hostdata->events) {
2827 struct NCR53c7x0_event *event;
2828 ++hostdata->event_index;
2829 if (hostdata->event_index >= hostdata->event_size)
2830 hostdata->event_index = 0;
2831 event = (struct NCR53c7x0_event *) hostdata->events +
2832 hostdata->event_index;
2833 event->event = (enum ncr_event) dsps;
2834 event->dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
2835 if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
2836 if (hostdata->chip / 100 == 8)
2837 event->target = NCR53c7x0_read8(SSID_REG_800);
2838 else {
2839 unsigned char tmp, sdid;
2840 tmp = NCR53c7x0_read8 (SDID_REG_700);
2841 if (!tmp)
2842 panic ("SDID_REG_700 = 0");
2843 tmp >>= 1;
2844 sdid = 0;
2845 while (tmp) {
2846 tmp >>= 1;
2847 sdid++;
2848 }
2849 event->target = sdid;
2850 }
2851 }
2852 else
2853 event->target = 255;
2854
2855 if (event->event == EVENT_RESELECT)
2856 event->lun = hostdata->reselected_identify & 0xf;
2857 else if (c)
2858 event->lun = c->device->lun;
2859 else
2860 event->lun = 255;
2861 do_gettimeofday(&(event->time));
2862 if (c) {
2863 event->pid = c->pid;
2864 memcpy ((void *) event->cmnd, (void *) c->cmnd,
2865 sizeof (event->cmnd));
2866 } else {
2867 event->pid = -1;
2868 }
2869 }
2870 return SPECIFIC_INT_RESTART;
2871 }
2872
2873 printk ("scsi%d : unknown user interrupt 0x%x\n",
2874 host->host_no, (unsigned) dsps);
2875 return SPECIFIC_INT_PANIC;
2876 }
2877}
2878
2879/*
2880 * XXX - the stock NCR assembler won't output the scriptu.h file,
2881 * which undefine's all #define'd CPP symbols from the script.h
2882 * file, which will create problems if you use multiple scripts
2883 * with the same symbol names.
2884 *
2885 * If you insist on using NCR's assembler, you could generate
2886 * scriptu.h from script.h using something like
2887 *
2888 * grep #define script.h | \
2889 * sed 's/#define[ ][ ]*\([_a-zA-Z][_a-zA-Z0-9]*\).*$/#undefine \1/' \
2890 * > scriptu.h
2891 */
2892
2893#include "53c7xx_u.h"
2894
2895/* XXX - add alternate script handling code here */
2896
2897
2898/*
2899 * Function : static void NCR537xx_soft_reset (struct Scsi_Host *host)
2900 *
2901 * Purpose : perform a soft reset of the NCR53c7xx chip
2902 *
2903 * Inputs : host - pointer to this host adapter's structure
2904 *
2905 * Preconditions : NCR53c7x0_init must have been called for this
2906 * host.
2907 *
2908 */
2909
2910static void
2911NCR53c7x0_soft_reset (struct Scsi_Host *host) {
2912 NCR53c7x0_local_declare();
2913 unsigned long flags;
2914 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2915 host->hostdata[0];
2916 NCR53c7x0_local_setup(host);
2917
2918 local_irq_save(flags);
2919
2920 /* Disable scsi chip and s/w level 7 ints */
2921
2922#ifdef CONFIG_MVME16x
2923 if (MACH_IS_MVME16x)
2924 {
2925 volatile unsigned long v;
2926
2927 v = *(volatile unsigned long *)0xfff4006c;
2928 v &= ~0x8000;
2929 *(volatile unsigned long *)0xfff4006c = v;
2930 v = *(volatile unsigned long *)0xfff4202c;
2931 v &= ~0x10;
2932 *(volatile unsigned long *)0xfff4202c = v;
2933 }
2934#endif
2935 /* Anything specific for your hardware? */
2936
2937 /*
2938 * Do a soft reset of the chip so that everything is
2939 * reinitialized to the power-on state.
2940 *
2941 * Basically follow the procedure outlined in the NCR53c700
2942 * data manual under Chapter Six, How to Use, Steps Necessary to
2943 * Start SCRIPTS, with the exception of actually starting the
2944 * script and setting up the synchronous transfer gunk.
2945 */
2946
2947 /* Should we reset the scsi bus here??????????????????? */
2948
2949 NCR53c7x0_write8(ISTAT_REG_700, ISTAT_10_SRST);
2950 NCR53c7x0_write8(ISTAT_REG_700, 0);
2951
2952 /*
2953 * saved_dcntl is set up in NCR53c7x0_init() before it is overwritten
2954 * here. We should have some better way of working out the CF bit
2955 * setting..
2956 */
2957
2958 hostdata->saved_dcntl = DCNTL_10_EA|DCNTL_10_COM;
2959 if (hostdata->scsi_clock > 50000000)
2960 hostdata->saved_dcntl |= DCNTL_700_CF_3;
2961 else
2962 if (hostdata->scsi_clock > 37500000)
2963 hostdata->saved_dcntl |= DCNTL_700_CF_2;
2964#if 0
2965 else
2966 /* Any clocks less than 37.5MHz? */
2967#endif
2968
2969 if (hostdata->options & OPTION_DEBUG_TRACE)
2970 NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl | DCNTL_SSM);
2971 else
2972 NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl);
2973 /* Following disables snooping - snooping is not required, as non-
2974 * cached pages are used for shared data, and appropriate use is
2975 * made of cache_push/cache_clear. Indeed, for 68060
2976 * enabling snooping causes disk corruption of ext2fs free block
2977 * bitmaps and the like. If you have a 68060 with snooping hardwared
2978 * on, then you need to enable CONFIG_060_WRITETHROUGH.
2979 */
2980 NCR53c7x0_write8(CTEST7_REG, CTEST7_10_TT1|CTEST7_STD);
2981 /* Actually burst of eight, according to my 53c710 databook */
2982 NCR53c7x0_write8(hostdata->dmode, DMODE_10_BL_8 | DMODE_10_FC2);
2983 NCR53c7x0_write8(SCID_REG, 1 << host->this_id);
2984 NCR53c7x0_write8(SBCL_REG, 0);
2985 NCR53c7x0_write8(SCNTL1_REG, SCNTL1_ESR_700);
2986 NCR53c7x0_write8(SCNTL0_REG, ((hostdata->options & OPTION_PARITY) ?
2987 SCNTL0_EPC : 0) | SCNTL0_EPG_700 | SCNTL0_ARB1 | SCNTL0_ARB2);
2988
2989 /*
2990 * Enable all interrupts, except parity which we only want when
2991 * the user requests it.
2992 */
2993
2994 NCR53c7x0_write8(DIEN_REG, DIEN_700_BF |
2995 DIEN_ABRT | DIEN_SSI | DIEN_SIR | DIEN_700_OPC);
2996
2997 NCR53c7x0_write8(SIEN_REG_700, ((hostdata->options & OPTION_PARITY) ?
2998 SIEN_PAR : 0) | SIEN_700_STO | SIEN_RST | SIEN_UDC |
2999 SIEN_SGE | SIEN_MA);
3000
3001#ifdef CONFIG_MVME16x
3002 if (MACH_IS_MVME16x)
3003 {
3004 volatile unsigned long v;
3005
3006 /* Enable scsi chip and s/w level 7 ints */
3007 v = *(volatile unsigned long *)0xfff40080;
3008 v = (v & ~(0xf << 28)) | (4 << 28);
3009 *(volatile unsigned long *)0xfff40080 = v;
3010 v = *(volatile unsigned long *)0xfff4006c;
3011 v |= 0x8000;
3012 *(volatile unsigned long *)0xfff4006c = v;
3013 v = *(volatile unsigned long *)0xfff4202c;
3014 v = (v & ~0xff) | 0x10 | 4;
3015 *(volatile unsigned long *)0xfff4202c = v;
3016 }
3017#endif
3018 /* Anything needed for your hardware? */
3019 local_irq_restore(flags);
3020}
3021
3022
3023/*
3024 * Function static struct NCR53c7x0_cmd *allocate_cmd (Scsi_Cmnd *cmd)
3025 *
3026 * Purpose : Return the first free NCR53c7x0_cmd structure (which are
3027 * reused in a LIFO manner to minimize cache thrashing).
3028 *
3029 * Side effects : If we haven't yet scheduled allocation of NCR53c7x0_cmd
3030 * structures for this device, do so. Attempt to complete all scheduled
3031 * allocations using get_zeroed_page(), putting NCR53c7x0_cmd structures on
3032 * the free list. Teach programmers not to drink and hack.
3033 *
3034 * Inputs : cmd - SCSI command
3035 *
3036 * Returns : NCR53c7x0_cmd structure allocated on behalf of cmd;
3037 * NULL on failure.
3038 */
3039
3040static void
3041my_free_page (void *addr, int dummy)
3042{
3043 /* XXX This assumes default cache mode to be IOMAP_FULL_CACHING, which
3044 * XXX may be invalid (CONFIG_060_WRITETHROUGH)
3045 */
3046 kernel_set_cachemode((void *)addr, 4096, IOMAP_FULL_CACHING);
3047 free_page ((u32)addr);
3048}
3049
3050static struct NCR53c7x0_cmd *
3051allocate_cmd (Scsi_Cmnd *cmd) {
3052 struct Scsi_Host *host = cmd->device->host;
3053 struct NCR53c7x0_hostdata *hostdata =
3054 (struct NCR53c7x0_hostdata *) host->hostdata[0];
3055 u32 real; /* Real address */
3056 int size; /* Size of *tmp */
3057 struct NCR53c7x0_cmd *tmp;
3058 unsigned long flags;
3059
3060 if (hostdata->options & OPTION_DEBUG_ALLOCATION)
3061 printk ("scsi%d : num_cmds = %d, can_queue = %d\n"
3062 " target = %d, lun = %d, %s\n",
3063 host->host_no, hostdata->num_cmds, host->can_queue,
3064 cmd->device->id, cmd->device->lun, (hostdata->cmd_allocated[cmd->device->id] &
3065 (1 << cmd->device->lun)) ? "already allocated" : "not allocated");
3066
3067/*
3068 * If we have not yet reserved commands for this I_T_L nexus, and
3069 * the device exists (as indicated by permanent Scsi_Cmnd structures
3070 * being allocated under 1.3.x, or being outside of scan_scsis in
3071 * 1.2.x), do so now.
3072 */
3073 if (!(hostdata->cmd_allocated[cmd->device->id] & (1 << cmd->device->lun)) &&
3074 cmd->device && cmd->device->has_cmdblocks) {
3075 if ((hostdata->extra_allocate + hostdata->num_cmds) < host->can_queue)
3076 hostdata->extra_allocate += host->cmd_per_lun;
3077 hostdata->cmd_allocated[cmd->device->id] |= (1 << cmd->device->lun);
3078 }
3079
3080 for (; hostdata->extra_allocate > 0 ; --hostdata->extra_allocate,
3081 ++hostdata->num_cmds) {
3082 /* historically, kmalloc has returned unaligned addresses; pad so we
3083 have enough room to ROUNDUP */
3084 size = hostdata->max_cmd_size + sizeof (void *);
3085#ifdef FORCE_DSA_ALIGNMENT
3086 /*
3087 * 53c710 rev.0 doesn't have an add-with-carry instruction.
3088 * Ensure we allocate enough memory to force alignment.
3089 */
3090 size += 256;
3091#endif
3092/* FIXME: for ISA bus '7xx chips, we need to or GFP_DMA in here */
3093
3094 if (size > 4096) {
3095 printk (KERN_ERR "53c7xx: allocate_cmd size > 4K\n");
3096 return NULL;
3097 }
3098 real = get_zeroed_page(GFP_ATOMIC);
3099 if (real == 0)
3100 return NULL;
3101 memset((void *)real, 0, 4096);
3102 cache_push(virt_to_phys((void *)real), 4096);
3103 cache_clear(virt_to_phys((void *)real), 4096);
3104 kernel_set_cachemode((void *)real, 4096, IOMAP_NOCACHE_SER);
3105 tmp = ROUNDUP(real, void *);
3106#ifdef FORCE_DSA_ALIGNMENT
3107 {
3108 if (((u32)tmp & 0xff) > CmdPageStart)
3109 tmp = (struct NCR53c7x0_cmd *)((u32)tmp + 255);
3110 tmp = (struct NCR53c7x0_cmd *)(((u32)tmp & ~0xff) + CmdPageStart);
3111#if 0
3112 printk ("scsi: size = %d, real = 0x%08x, tmp set to 0x%08x\n",
3113 size, real, (u32)tmp);
3114#endif
3115 }
3116#endif
3117 tmp->real = (void *)real;
3118 tmp->size = size;
3119 tmp->free = ((void (*)(void *, int)) my_free_page);
3120 local_irq_save(flags);
3121 tmp->next = hostdata->free;
3122 hostdata->free = tmp;
3123 local_irq_restore(flags);
3124 }
3125 local_irq_save(flags);
3126 tmp = (struct NCR53c7x0_cmd *) hostdata->free;
3127 if (tmp) {
3128 hostdata->free = tmp->next;
3129 }
3130 local_irq_restore(flags);
3131 if (!tmp)
3132 printk ("scsi%d : can't allocate command for target %d lun %d\n",
3133 host->host_no, cmd->device->id, cmd->device->lun);
3134 return tmp;
3135}
3136
3137/*
3138 * Function static struct NCR53c7x0_cmd *create_cmd (Scsi_Cmnd *cmd)
3139 *
3140 *
3141 * Purpose : allocate a NCR53c7x0_cmd structure, initialize it based on the
3142 * Scsi_Cmnd structure passed in cmd, including dsa and Linux field
3143 * initialization, and dsa code relocation.
3144 *
3145 * Inputs : cmd - SCSI command
3146 *
3147 * Returns : NCR53c7x0_cmd structure corresponding to cmd,
3148 * NULL on failure.
3149 */
3150static struct NCR53c7x0_cmd *
3151create_cmd (Scsi_Cmnd *cmd) {
3152 NCR53c7x0_local_declare();
3153 struct Scsi_Host *host = cmd->device->host;
3154 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
3155 host->hostdata[0];
3156 struct NCR53c7x0_cmd *tmp; /* NCR53c7x0_cmd structure for this command */
3157 int datain, /* Number of instructions per phase */
3158 dataout;
3159 int data_transfer_instructions, /* Count of dynamic instructions */
3160 i; /* Counter */
3161 u32 *cmd_datain, /* Address of datain/dataout code */
3162 *cmd_dataout; /* Incremented as we assemble */
3163#ifdef notyet
3164 unsigned char *msgptr; /* Current byte in select message */
3165 int msglen; /* Length of whole select message */
3166#endif
3167 unsigned long flags;
3168 u32 exp_select_indirect; /* Used in sanity check */
3169 NCR53c7x0_local_setup(cmd->device->host);
3170
3171 if (!(tmp = allocate_cmd (cmd)))
3172 return NULL;
3173
3174 /*
3175 * Copy CDB and initialised result fields from Scsi_Cmnd to NCR53c7x0_cmd.
3176 * We do this because NCR53c7x0_cmd may have a special cache mode
3177 * selected to cope with lack of bus snooping, etc.
3178 */
3179
3180 memcpy(tmp->cmnd, cmd->cmnd, 12);
3181 tmp->result = cmd->result;
3182
3183 /*
3184 * Decide whether we need to generate commands for DATA IN,
3185 * DATA OUT, neither, or both based on the SCSI command
3186 */
3187
3188 switch (cmd->cmnd[0]) {
3189 /* These commands do DATA IN */
3190 case INQUIRY:
3191 case MODE_SENSE:
3192 case READ_6:
3193 case READ_10:
3194 case READ_CAPACITY:
3195 case REQUEST_SENSE:
3196 case READ_BLOCK_LIMITS:
3197 case READ_TOC:
3198 datain = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
3199 dataout = 0;
3200 break;
3201 /* These commands do DATA OUT */
3202 case MODE_SELECT:
3203 case WRITE_6:
3204 case WRITE_10:
3205#if 0
3206 printk("scsi%d : command is ", host->host_no);
3207 print_command(cmd->cmnd);
3208#endif
3209#if 0
3210 printk ("scsi%d : %d scatter/gather segments\n", host->host_no,
3211 cmd->use_sg);
3212#endif
3213 datain = 0;
3214 dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
3215#if 0
3216 hostdata->options |= OPTION_DEBUG_INTR;
3217#endif
3218 break;
3219 /*
3220 * These commands do no data transfer, we should force an
3221 * interrupt if a data phase is attempted on them.
3222 */
3223 case TEST_UNIT_READY:
3224 case ALLOW_MEDIUM_REMOVAL:
3225 case START_STOP:
3226 datain = dataout = 0;
3227 break;
3228 /*
3229 * We don't know about these commands, so generate code to handle
3230 * both DATA IN and DATA OUT phases. More efficient to identify them
3231 * and add them to the above cases.
3232 */
3233 default:
3234 printk("scsi%d : datain+dataout for command ", host->host_no);
3235 print_command(cmd->cmnd);
3236 datain = dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
3237 }
3238
3239 /*
3240 * New code : so that active pointers work correctly regardless
3241 * of where the saved data pointer is at, we want to immediately
3242 * enter the dynamic code after selection, and on a non-data
3243 * phase perform a CALL to the non-data phase handler, with
3244 * returns back to this address.
3245 *
3246 * If a phase mismatch is encountered in the middle of a
3247 * Block MOVE instruction, we want to _leave_ that instruction
3248 * unchanged as the current case is, modify a temporary buffer,
3249 * and point the active pointer (TEMP) at that.
3250 *
3251 * Furthermore, we want to implement a saved data pointer,
3252 * set by the SAVE_DATA_POINTERs message.
3253 *
3254 * So, the data transfer segments will change to
3255 * CALL data_transfer, WHEN NOT data phase
3256 * MOVE x, x, WHEN data phase
3257 * ( repeat )
3258 * JUMP other_transfer
3259 */
3260
3261 data_transfer_instructions = datain + dataout;
3262
3263 /*
3264 * When we perform a request sense, we overwrite various things,
3265 * including the data transfer code. Make sure we have enough
3266 * space to do that.
3267 */
3268
3269 if (data_transfer_instructions < 2)
3270 data_transfer_instructions = 2;
3271
3272
3273 /*
3274 * The saved data pointer is set up so that a RESTORE POINTERS message
3275 * will start the data transfer over at the beginning.
3276 */
3277
3278 tmp->saved_data_pointer = virt_to_bus (hostdata->script) +
3279 hostdata->E_data_transfer;
3280
3281 /*
3282 * Initialize Linux specific fields.
3283 */
3284
3285 tmp->cmd = cmd;
3286 tmp->next = NULL;
3287 tmp->flags = 0;
3288 tmp->dsa_next_addr = virt_to_bus(tmp->dsa) + hostdata->dsa_next -
3289 hostdata->dsa_start;
3290 tmp->dsa_addr = virt_to_bus(tmp->dsa) - hostdata->dsa_start;
3291
3292 /*
3293 * Calculate addresses of dynamic code to fill in DSA
3294 */
3295
3296 tmp->data_transfer_start = tmp->dsa + (hostdata->dsa_end -
3297 hostdata->dsa_start) / sizeof(u32);
3298 tmp->data_transfer_end = tmp->data_transfer_start +
3299 2 * data_transfer_instructions;
3300
3301 cmd_datain = datain ? tmp->data_transfer_start : NULL;
3302 cmd_dataout = dataout ? (datain ? cmd_datain + 2 * datain : tmp->
3303 data_transfer_start) : NULL;
3304
3305 /*
3306 * Fill in the NCR53c7x0_cmd structure as follows
3307 * dsa, with fixed up DSA code
3308 * datain code
3309 * dataout code
3310 */
3311
3312 /* Copy template code into dsa and perform all necessary fixups */
3313 if (hostdata->dsa_fixup)
3314 hostdata->dsa_fixup(tmp);
3315
3316 patch_dsa_32(tmp->dsa, dsa_next, 0, 0);
3317 /*
3318 * XXX is this giving 53c710 access to the Scsi_Cmnd in some way?
3319 * Do we need to change it for caching reasons?
3320 */
3321 patch_dsa_32(tmp->dsa, dsa_cmnd, 0, virt_to_bus(cmd));
3322
3323 if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS) {
3324
3325 exp_select_indirect = ((1 << cmd->device->id) << 16) |
3326 (hostdata->sync[cmd->device->id].sxfer_sanity << 8);
3327
3328 if (hostdata->sync[cmd->device->id].select_indirect !=
3329 exp_select_indirect) {
3330 printk ("scsi%d : sanity check failed select_indirect=0x%x\n",
3331 host->host_no, hostdata->sync[cmd->device->id].select_indirect);
3332 FATAL(host);
3333
3334 }
3335 }
3336
3337 patch_dsa_32(tmp->dsa, dsa_select, 0,
3338 hostdata->sync[cmd->device->id].select_indirect);
3339
3340 /*
3341 * Right now, we'll do the WIDE and SYNCHRONOUS negotiations on
3342 * different commands; although it should be trivial to do them
3343 * both at the same time.
3344 */
3345 if (hostdata->initiate_wdtr & (1 << cmd->device->id)) {
3346 memcpy ((void *) (tmp->select + 1), (void *) wdtr_message,
3347 sizeof(wdtr_message));
3348 patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(wdtr_message));
3349 local_irq_save(flags);
3350 hostdata->initiate_wdtr &= ~(1 << cmd->device->id);
3351 local_irq_restore(flags);
3352 } else if (hostdata->initiate_sdtr & (1 << cmd->device->id)) {
3353 memcpy ((void *) (tmp->select + 1), (void *) sdtr_message,
3354 sizeof(sdtr_message));
3355 patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(sdtr_message));
3356 tmp->flags |= CMD_FLAG_SDTR;
3357 local_irq_save(flags);
3358 hostdata->initiate_sdtr &= ~(1 << cmd->device->id);
3359 local_irq_restore(flags);
3360
3361 }
3362#if 1
3363 else if (!(hostdata->talked_to & (1 << cmd->device->id)) &&
3364 !(hostdata->options & OPTION_NO_ASYNC)) {
3365
3366 memcpy ((void *) (tmp->select + 1), (void *) async_message,
3367 sizeof(async_message));
3368 patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(async_message));
3369 tmp->flags |= CMD_FLAG_SDTR;
3370 }
3371#endif
3372 else
3373 patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1);
3374
3375 hostdata->talked_to |= (1 << cmd->device->id);
3376 tmp->select[0] = (hostdata->options & OPTION_DISCONNECT) ?
3377 IDENTIFY (1, cmd->device->lun) : IDENTIFY (0, cmd->device->lun);
3378 patch_dsa_32(tmp->dsa, dsa_msgout, 1, virt_to_bus(tmp->select));
3379 patch_dsa_32(tmp->dsa, dsa_cmdout, 0, cmd->cmd_len);
3380 patch_dsa_32(tmp->dsa, dsa_cmdout, 1, virt_to_bus(tmp->cmnd));
3381 patch_dsa_32(tmp->dsa, dsa_dataout, 0, cmd_dataout ?
3382 virt_to_bus (cmd_dataout)
3383 : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
3384 patch_dsa_32(tmp->dsa, dsa_datain, 0, cmd_datain ?
3385 virt_to_bus (cmd_datain)
3386 : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
3387 /*
3388 * XXX - need to make endian aware, should use separate variables
3389 * for both status and message bytes.
3390 */
3391 patch_dsa_32(tmp->dsa, dsa_msgin, 0, 1);
3392/*
3393 * FIXME : these only works for little endian. We probably want to
3394 * provide message and status fields in the NCR53c7x0_cmd
3395 * structure, and assign them to cmd->result when we're done.
3396 */
3397#ifdef BIG_ENDIAN
3398 patch_dsa_32(tmp->dsa, dsa_msgin, 1, virt_to_bus(&tmp->result) + 2);
3399 patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
3400 patch_dsa_32(tmp->dsa, dsa_status, 1, virt_to_bus(&tmp->result) + 3);
3401#else
3402 patch_dsa_32(tmp->dsa, dsa_msgin, 1, virt_to_bus(&tmp->result) + 1);
3403 patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
3404 patch_dsa_32(tmp->dsa, dsa_status, 1, virt_to_bus(&tmp->result));
3405#endif
3406 patch_dsa_32(tmp->dsa, dsa_msgout_other, 0, 1);
3407 patch_dsa_32(tmp->dsa, dsa_msgout_other, 1,
3408 virt_to_bus(&(hostdata->NCR53c7xx_msg_nop)));
3409
3410 /*
3411 * Generate code for zero or more of the DATA IN, DATA OUT phases
3412 * in the format
3413 *
3414 * CALL data_transfer, WHEN NOT phase
3415 * MOVE first buffer length, first buffer address, WHEN phase
3416 * ...
3417 * MOVE last buffer length, last buffer address, WHEN phase
3418 * JUMP other_transfer
3419 */
3420
3421/*
3422 * See if we're getting to data transfer by generating an unconditional
3423 * interrupt.
3424 */
3425#if 0
3426 if (datain) {
3427 cmd_datain[0] = 0x98080000;
3428 cmd_datain[1] = 0x03ffd00d;
3429 cmd_datain += 2;
3430 }
3431#endif
3432
3433/*
3434 * XXX - I'm undecided whether all of this nonsense is faster
3435 * in the long run, or whether I should just go and implement a loop
3436 * on the NCR chip using table indirect mode?
3437 *
3438 * In any case, this is how it _must_ be done for 53c700/700-66 chips,
3439 * so this stays even when we come up with something better.
3440 *
3441 * When we're limited to 1 simultaneous command, no overlapping processing,
3442 * we're seeing 630K/sec, with 7% CPU usage on a slow Syquest 45M
3443 * drive.
3444 *
3445 * Not bad, not good. We'll see.
3446 */
3447
3448 tmp->bounce.len = 0; /* Assume aligned buffer */
3449
3450 for (i = 0; cmd->use_sg ? (i < cmd->use_sg) : !i; cmd_datain += 4,
3451 cmd_dataout += 4, ++i) {
3452 u32 vbuf = cmd->use_sg
3453 ? (u32)page_address(((struct scatterlist *)cmd->buffer)[i].page)+
3454 ((struct scatterlist *)cmd->buffer)[i].offset
3455 : (u32)(cmd->request_buffer);
3456 u32 bbuf = virt_to_bus((void *)vbuf);
3457 u32 count = cmd->use_sg ?
3458 ((struct scatterlist *)cmd->buffer)[i].length :
3459 cmd->request_bufflen;
3460
3461 /*
3462 * If we have buffers which are not aligned with 16 byte cache
3463 * lines, then we just hope nothing accesses the other parts of
3464 * those cache lines while the transfer is in progress. That would
3465 * fill the cache, and subsequent reads of the dma data would pick
3466 * up the wrong thing.
3467 * XXX We need a bounce buffer to handle that correctly.
3468 */
3469
3470 if (((bbuf & 15) || (count & 15)) && (datain || dataout))
3471 {
3472 /* Bounce buffer needed */
3473 if (cmd->use_sg)
3474 printk ("53c7xx: Non-aligned buffer with use_sg\n");
3475 else if (datain && dataout)
3476 printk ("53c7xx: Non-aligned buffer with datain && dataout\n");
3477 else if (count > 256)
3478 printk ("53c7xx: Non-aligned transfer > 256 bytes\n");
3479 else
3480 {
3481 if (datain)
3482 {
3483 tmp->bounce.len = count;
3484 tmp->bounce.addr = vbuf;
3485 bbuf = virt_to_bus(tmp->bounce.buf);
3486 tmp->bounce.buf[0] = 0xff;
3487 tmp->bounce.buf[1] = 0xfe;
3488 tmp->bounce.buf[2] = 0xfd;
3489 tmp->bounce.buf[3] = 0xfc;
3490 }
3491 if (dataout)
3492 {
3493 memcpy ((void *)tmp->bounce.buf, (void *)vbuf, count);
3494 bbuf = virt_to_bus(tmp->bounce.buf);
3495 }
3496 }
3497 }
3498
3499 if (datain) {
3500 cache_clear(virt_to_phys((void *)vbuf), count);
3501 /* CALL other_in, WHEN NOT DATA_IN */
3502 cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL |
3503 DCMD_TCI_IO) << 24) |
3504 DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
3505 cmd_datain[1] = virt_to_bus (hostdata->script) +
3506 hostdata->E_other_in;
3507 /* MOVE count, buf, WHEN DATA_IN */
3508 cmd_datain[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | DCMD_BMI_IO)
3509 << 24) | count;
3510 cmd_datain[3] = bbuf;
3511#if 0
3512 print_insn (host, cmd_datain, "dynamic ", 1);
3513 print_insn (host, cmd_datain + 2, "dynamic ", 1);
3514#endif
3515 }
3516 if (dataout) {
3517 cache_push(virt_to_phys((void *)vbuf), count);
3518 /* CALL other_out, WHEN NOT DATA_OUT */
3519 cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL) << 24) |
3520 DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
3521 cmd_dataout[1] = virt_to_bus(hostdata->script) +
3522 hostdata->E_other_out;
3523 /* MOVE count, buf, WHEN DATA+OUT */
3524 cmd_dataout[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I) << 24)
3525 | count;
3526 cmd_dataout[3] = bbuf;
3527#if 0
3528 print_insn (host, cmd_dataout, "dynamic ", 1);
3529 print_insn (host, cmd_dataout + 2, "dynamic ", 1);
3530#endif
3531 }
3532 }
3533
3534 /*
3535 * Install JUMP instructions after the data transfer routines to return
3536 * control to the do_other_transfer routines.
3537 */
3538
3539
3540 if (datain) {
3541 cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
3542 DBC_TCI_TRUE;
3543 cmd_datain[1] = virt_to_bus(hostdata->script) +
3544 hostdata->E_other_transfer;
3545#if 0
3546 print_insn (host, cmd_datain, "dynamic jump ", 1);
3547#endif
3548 cmd_datain += 2;
3549 }
3550#if 0
3551 if (datain) {
3552 cmd_datain[0] = 0x98080000;
3553 cmd_datain[1] = 0x03ffdeed;
3554 cmd_datain += 2;
3555 }
3556#endif
3557 if (dataout) {
3558 cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
3559 DBC_TCI_TRUE;
3560 cmd_dataout[1] = virt_to_bus(hostdata->script) +
3561 hostdata->E_other_transfer;
3562#if 0
3563 print_insn (host, cmd_dataout, "dynamic jump ", 1);
3564#endif
3565 cmd_dataout += 2;
3566 }
3567
3568 return tmp;
3569}
3570
3571/*
3572 * Function : int NCR53c7xx_queue_command (Scsi_Cmnd *cmd,
3573 * void (*done)(Scsi_Cmnd *))
3574 *
3575 * Purpose : enqueues a SCSI command
3576 *
3577 * Inputs : cmd - SCSI command, done - function called on completion, with
3578 * a pointer to the command descriptor.
3579 *
3580 * Returns : 0
3581 *
3582 * Side effects :
3583 * cmd is added to the per instance driver issue_queue, with major
3584 * twiddling done to the host specific fields of cmd. If the
3585 * process_issue_queue coroutine isn't running, it is restarted.
3586 *
3587 * NOTE : we use the host_scribble field of the Scsi_Cmnd structure to
3588 * hold our own data, and pervert the ptr field of the SCp field
3589 * to create a linked list.
3590 */
3591
3592int
3593NCR53c7xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *)) {
3594 struct Scsi_Host *host = cmd->device->host;
3595 struct NCR53c7x0_hostdata *hostdata =
3596 (struct NCR53c7x0_hostdata *) host->hostdata[0];
3597 unsigned long flags;
3598 Scsi_Cmnd *tmp;
3599
3600 cmd->scsi_done = done;
3601 cmd->host_scribble = NULL;
3602 cmd->SCp.ptr = NULL;
3603 cmd->SCp.buffer = NULL;
3604
3605#ifdef VALID_IDS
3606 /* Ignore commands on invalid IDs */
3607 if (!hostdata->valid_ids[cmd->device->id]) {
3608 printk("scsi%d : ignoring target %d lun %d\n", host->host_no,
3609 cmd->device->id, cmd->device->lun);
3610 cmd->result = (DID_BAD_TARGET << 16);
3611 done(cmd);
3612 return 0;
3613 }
3614#endif
3615
3616 local_irq_save(flags);
3617 if ((hostdata->options & (OPTION_DEBUG_INIT_ONLY|OPTION_DEBUG_PROBE_ONLY))
3618 || ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
3619 !(hostdata->debug_lun_limit[cmd->device->id] & (1 << cmd->device->lun)))
3620#ifdef LINUX_1_2
3621 || cmd->device->id > 7
3622#else
3623 || cmd->device->id > host->max_id
3624#endif
3625 || cmd->device->id == host->this_id
3626 || hostdata->state == STATE_DISABLED) {
3627 printk("scsi%d : disabled or bad target %d lun %d\n", host->host_no,
3628 cmd->device->id, cmd->device->lun);
3629 cmd->result = (DID_BAD_TARGET << 16);
3630 done(cmd);
3631 local_irq_restore(flags);
3632 return 0;
3633 }
3634
3635 if ((hostdata->options & OPTION_DEBUG_NCOMMANDS_LIMIT) &&
3636 (hostdata->debug_count_limit == 0)) {
3637 printk("scsi%d : maximum commands exceeded\n", host->host_no);
3638 cmd->result = (DID_BAD_TARGET << 16);
3639 done(cmd);
3640 local_irq_restore(flags);
3641 return 0;
3642 }
3643
3644 if (hostdata->options & OPTION_DEBUG_READ_ONLY) {
3645 switch (cmd->cmnd[0]) {
3646 case WRITE_6:
3647 case WRITE_10:
3648 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
3649 host->host_no);
3650 cmd->result = (DID_BAD_TARGET << 16);
3651 done(cmd);
3652 local_irq_restore(flags);
3653 return 0;
3654 }
3655 }
3656
3657 if ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
3658 hostdata->debug_count_limit != -1)
3659 --hostdata->debug_count_limit;
3660
3661 cmd->result = 0xffff; /* The NCR will overwrite message
3662 and status with valid data */
3663 cmd->host_scribble = (unsigned char *) tmp = create_cmd (cmd);
3664
3665 /*
3666 * REQUEST SENSE commands are inserted at the head of the queue
3667 * so that we do not clear the contingent allegiance condition
3668 * they may be looking at.
3669 */
3670
3671 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
3672 cmd->SCp.ptr = (unsigned char *) hostdata->issue_queue;
3673 hostdata->issue_queue = cmd;
3674 } else {
3675 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->SCp.ptr;
3676 tmp = (Scsi_Cmnd *) tmp->SCp.ptr);
3677 tmp->SCp.ptr = (unsigned char *) cmd;
3678 }
3679 local_irq_restore(flags);
3680 run_process_issue_queue();
3681 return 0;
3682}
3683
3684/*
3685 * Function : void to_schedule_list (struct Scsi_Host *host,
3686 * struct NCR53c7x0_hostdata * hostdata, Scsi_Cmnd *cmd)
3687 *
3688 * Purpose : takes a SCSI command which was just removed from the
3689 * issue queue, and deals with it by inserting it in the first
3690 * free slot in the schedule list or by terminating it immediately.
3691 *
3692 * Inputs :
3693 * host - SCSI host adapter; hostdata - hostdata structure for
3694 * this adapter; cmd - a pointer to the command; should have
3695 * the host_scribble field initialized to point to a valid
3696 *
3697 * Side effects :
3698 * cmd is added to the per instance schedule list, with minor
3699 * twiddling done to the host specific fields of cmd.
3700 *
3701 */
3702
3703static __inline__ void
3704to_schedule_list (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
3705 struct NCR53c7x0_cmd *cmd) {
3706 NCR53c7x0_local_declare();
3707 Scsi_Cmnd *tmp = cmd->cmd;
3708 unsigned long flags;
3709 /* dsa start is negative, so subtraction is used */
3710 volatile u32 *ncrcurrent;
3711
3712 int i;
3713 NCR53c7x0_local_setup(host);
3714#if 0
3715 printk("scsi%d : new dsa is 0x%lx (virt 0x%p)\n", host->host_no,
3716 virt_to_bus(hostdata->dsa), hostdata->dsa);
3717#endif
3718
3719 local_irq_save(flags);
3720
3721 /*
3722 * Work around race condition : if an interrupt fired and we
3723 * got disabled forget about this command.
3724 */
3725
3726 if (hostdata->state == STATE_DISABLED) {
3727 printk("scsi%d : driver disabled\n", host->host_no);
3728 tmp->result = (DID_BAD_TARGET << 16);
3729 cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
3730 hostdata->free = cmd;
3731 tmp->scsi_done(tmp);
3732 local_irq_restore(flags);
3733 return;
3734 }
3735
3736 for (i = host->can_queue, ncrcurrent = hostdata->schedule;
3737 i > 0 && ncrcurrent[0] != hostdata->NOP_insn;
3738 --i, ncrcurrent += 2 /* JUMP instructions are two words */);
3739
3740 if (i > 0) {
3741 ++hostdata->busy[tmp->device->id][tmp->device->lun];
3742 cmd->next = hostdata->running_list;
3743 hostdata->running_list = cmd;
3744
3745 /* Restore this instruction to a NOP once the command starts */
3746 cmd->dsa [(hostdata->dsa_jump_dest - hostdata->dsa_start) /
3747 sizeof(u32)] = (u32) virt_to_bus ((void *)ncrcurrent);
3748 /* Replace the current jump operand. */
3749 ncrcurrent[1] =
3750 virt_to_bus ((void *) cmd->dsa) + hostdata->E_dsa_code_begin -
3751 hostdata->E_dsa_code_template;
3752 /* Replace the NOP instruction with a JUMP */
3753 ncrcurrent[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) |
3754 DBC_TCI_TRUE;
3755 } else {
3756 printk ("scsi%d: no free slot\n", host->host_no);
3757 disable(host);
3758 tmp->result = (DID_ERROR << 16);
3759 cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
3760 hostdata->free = cmd;
3761 tmp->scsi_done(tmp);
3762 local_irq_restore(flags);
3763 return;
3764 }
3765
3766 /*
3767 * If the NCR chip is in an idle state, start it running the scheduler
3768 * immediately. Otherwise, signal the chip to jump to schedule as
3769 * soon as it is idle.
3770 */
3771
3772 if (hostdata->idle) {
3773 hostdata->idle = 0;
3774 hostdata->state = STATE_RUNNING;
3775 NCR53c7x0_write32 (DSP_REG, virt_to_bus ((void *)hostdata->schedule));
3776 if (hostdata->options & OPTION_DEBUG_TRACE)
3777 NCR53c7x0_write8 (DCNTL_REG, hostdata->saved_dcntl |
3778 DCNTL_SSM | DCNTL_STD);
3779 } else {
3780 NCR53c7x0_write8(hostdata->istat, ISTAT_10_SIGP);
3781 }
3782
3783 local_irq_restore(flags);
3784}
3785
3786/*
3787 * Function : busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata
3788 * *hostdata, Scsi_Cmnd *cmd)
3789 *
3790 * Purpose : decide if we can pass the given SCSI command on to the
3791 * device in question or not.
3792 *
3793 * Returns : non-zero when we're busy, 0 when we aren't.
3794 */
3795
3796static __inline__ int
3797busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
3798 Scsi_Cmnd *cmd) {
3799 /* FIXME : in the future, this needs to accommodate SCSI-II tagged
3800 queuing, and we may be able to play with fairness here a bit.
3801 */
3802 return hostdata->busy[cmd->device->id][cmd->device->lun];
3803}
3804
3805/*
3806 * Function : process_issue_queue (void)
3807 *
3808 * Purpose : transfer commands from the issue queue to NCR start queue
3809 * of each NCR53c7/8xx in the system, avoiding kernel stack
3810 * overflows when the scsi_done() function is invoked recursively.
3811 *
3812 * NOTE : process_issue_queue exits with interrupts *disabled*, so the
3813 * caller must reenable them if it desires.
3814 *
3815 * NOTE : process_issue_queue should be called from both
3816 * NCR53c7x0_queue_command() and from the interrupt handler
3817 * after command completion in case NCR53c7x0_queue_command()
3818 * isn't invoked again but we've freed up resources that are
3819 * needed.
3820 */
3821
3822static void
3823process_issue_queue (unsigned long flags) {
3824 Scsi_Cmnd *tmp, *prev;
3825 struct Scsi_Host *host;
3826 struct NCR53c7x0_hostdata *hostdata;
3827 int done;
3828
3829 /*
3830 * We run (with interrupts disabled) until we're sure that none of
3831 * the host adapters have anything that can be done, at which point
3832 * we set process_issue_queue_running to 0 and exit.
3833 *
3834 * Interrupts are enabled before doing various other internal
3835 * instructions, after we've decided that we need to run through
3836 * the loop again.
3837 *
3838 */
3839
3840 do {
3841 local_irq_disable(); /* Freeze request queues */
3842 done = 1;
3843 for (host = first_host; host && host->hostt == the_template;
3844 host = host->next) {
3845 hostdata = (struct NCR53c7x0_hostdata *) host->hostdata[0];
3846 local_irq_disable();
3847 if (hostdata->issue_queue) {
3848 if (hostdata->state == STATE_DISABLED) {
3849 tmp = (Scsi_Cmnd *) hostdata->issue_queue;
3850 hostdata->issue_queue = (Scsi_Cmnd *) tmp->SCp.ptr;
3851 tmp->result = (DID_BAD_TARGET << 16);
3852 if (tmp->host_scribble) {
3853 ((struct NCR53c7x0_cmd *)tmp->host_scribble)->next =
3854 hostdata->free;
3855 hostdata->free =
3856 (struct NCR53c7x0_cmd *)tmp->host_scribble;
3857 tmp->host_scribble = NULL;
3858 }
3859 tmp->scsi_done (tmp);
3860 done = 0;
3861 } else
3862 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
3863 prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *)
3864 tmp->SCp.ptr)
3865 if (!tmp->host_scribble ||
3866 !busyp (host, hostdata, tmp)) {
3867 if (prev)
3868 prev->SCp.ptr = tmp->SCp.ptr;
3869 else
3870 hostdata->issue_queue = (Scsi_Cmnd *)
3871 tmp->SCp.ptr;
3872 tmp->SCp.ptr = NULL;
3873 if (tmp->host_scribble) {
3874 if (hostdata->options & OPTION_DEBUG_QUEUES)
3875 printk ("scsi%d : moving command for target %d lun %d to start list\n",
3876 host->host_no, tmp->device->id, tmp->device->lun);
3877
3878
3879 to_schedule_list (host, hostdata,
3880 (struct NCR53c7x0_cmd *)
3881 tmp->host_scribble);
3882 } else {
3883 if (((tmp->result & 0xff) == 0xff) ||
3884 ((tmp->result & 0xff00) == 0xff00)) {
3885 printk ("scsi%d : danger Will Robinson!\n",
3886 host->host_no);
3887 tmp->result = DID_ERROR << 16;
3888 disable (host);
3889 }
3890 tmp->scsi_done(tmp);
3891 }
3892 done = 0;
3893 } /* if target/lun is not busy */
3894 } /* if hostdata->issue_queue */
3895 if (!done)
3896 local_irq_restore(flags);
3897 } /* for host */
3898 } while (!done);
3899 process_issue_queue_running = 0;
3900}
3901
3902/*
3903 * Function : static void intr_scsi (struct Scsi_Host *host,
3904 * struct NCR53c7x0_cmd *cmd)
3905 *
3906 * Purpose : handle all SCSI interrupts, indicated by the setting
3907 * of the SIP bit in the ISTAT register.
3908 *
3909 * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
3910 * may be NULL.
3911 */
3912
3913static void
3914intr_scsi (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
3915 NCR53c7x0_local_declare();
3916 struct NCR53c7x0_hostdata *hostdata =
3917 (struct NCR53c7x0_hostdata *) host->hostdata[0];
3918 unsigned char sstat0_sist0, sist1, /* Registers */
3919 fatal; /* Did a fatal interrupt
3920 occur ? */
3921
3922 NCR53c7x0_local_setup(host);
3923
3924 fatal = 0;
3925
3926 sstat0_sist0 = NCR53c7x0_read8(SSTAT0_REG);
3927 sist1 = 0;
3928
3929 if (hostdata->options & OPTION_DEBUG_INTR)
3930 printk ("scsi%d : SIST0 0x%0x, SIST1 0x%0x\n", host->host_no,
3931 sstat0_sist0, sist1);
3932
3933 /* 250ms selection timeout */
3934 if (sstat0_sist0 & SSTAT0_700_STO) {
3935 fatal = 1;
3936 if (hostdata->options & OPTION_DEBUG_INTR) {
3937 printk ("scsi%d : Selection Timeout\n", host->host_no);
3938 if (cmd) {
3939 printk("scsi%d : target %d, lun %d, command ",
3940 host->host_no, cmd->cmd->device->id, cmd->cmd->device->lun);
3941 print_command (cmd->cmd->cmnd);
3942 printk("scsi%d : dsp = 0x%x (virt 0x%p)\n", host->host_no,
3943 NCR53c7x0_read32(DSP_REG),
3944 bus_to_virt(NCR53c7x0_read32(DSP_REG)));
3945 } else {
3946 printk("scsi%d : no command\n", host->host_no);
3947 }
3948 }
3949/*
3950 * XXX - question : how do we want to handle the Illegal Instruction
3951 * interrupt, which may occur before or after the Selection Timeout
3952 * interrupt?
3953 */
3954
3955 if (1) {
3956 hostdata->idle = 1;
3957 hostdata->expecting_sto = 0;
3958
3959 if (hostdata->test_running) {
3960 hostdata->test_running = 0;
3961 hostdata->test_completed = 3;
3962 } else if (cmd) {
3963 abnormal_finished(cmd, DID_BAD_TARGET << 16);
3964 }
3965#if 0
3966 hostdata->intrs = 0;
3967#endif
3968 }
3969 }
3970
3971/*
3972 * FIXME : in theory, we can also get a UDC when a STO occurs.
3973 */
3974 if (sstat0_sist0 & SSTAT0_UDC) {
3975 fatal = 1;
3976 if (cmd) {
3977 printk("scsi%d : target %d lun %d unexpected disconnect\n",
3978 host->host_no, cmd->cmd->device->id, cmd->cmd->device->lun);
3979 print_lots (host);
3980 abnormal_finished(cmd, DID_ERROR << 16);
3981 } else
3982 printk("scsi%d : unexpected disconnect (no command)\n",
3983 host->host_no);
3984
3985 hostdata->dsp = (u32 *) hostdata->schedule;
3986 hostdata->dsp_changed = 1;
3987 }
3988
3989 /* SCSI PARITY error */
3990 if (sstat0_sist0 & SSTAT0_PAR) {
3991 fatal = 1;
3992 if (cmd && cmd->cmd) {
3993 printk("scsi%d : target %d lun %d parity error.\n",
3994 host->host_no, cmd->cmd->device->id, cmd->cmd->device->lun);
3995 abnormal_finished (cmd, DID_PARITY << 16);
3996 } else
3997 printk("scsi%d : parity error\n", host->host_no);
3998 /* Should send message out, parity error */
3999
4000 /* XXX - Reduce synchronous transfer rate! */
4001 hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
4002 sizeof(u32);
4003 hostdata->dsp_changed = 1;
4004 /* SCSI GROSS error */
4005 }
4006
4007 if (sstat0_sist0 & SSTAT0_SGE) {
4008 fatal = 1;
4009 printk("scsi%d : gross error, saved2_dsa = 0x%x\n", host->host_no,
4010 (unsigned int)hostdata->saved2_dsa);
4011 print_lots (host);
4012
4013 /*
4014 * A SCSI gross error may occur when we have
4015 *
4016 * - A synchronous offset which causes the SCSI FIFO to be overwritten.
4017 *
4018 * - A REQ which causes the maximum synchronous offset programmed in
4019 * the SXFER register to be exceeded.
4020 *
4021 * - A phase change with an outstanding synchronous offset.
4022 *
4023 * - Residual data in the synchronous data FIFO, with a transfer
4024 * other than a synchronous receive is started.$#
4025 */
4026
4027
4028 /* XXX Should deduce synchronous transfer rate! */
4029 hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
4030 sizeof(u32);
4031 hostdata->dsp_changed = 1;
4032 /* Phase mismatch */
4033 }
4034
4035 if (sstat0_sist0 & SSTAT0_MA) {
4036 fatal = 1;
4037 if (hostdata->options & OPTION_DEBUG_INTR)
4038 printk ("scsi%d : SSTAT0_MA\n", host->host_no);
4039 intr_phase_mismatch (host, cmd);
4040 }
4041
4042#if 0
4043 if (sstat0_sist0 & SIST0_800_RSL)
4044 printk ("scsi%d : Oh no Mr. Bill!\n", host->host_no);
4045#endif
4046
4047/*
4048 * If a fatal SCSI interrupt occurs, we must insure that the DMA and
4049 * SCSI FIFOs were flushed.
4050 */
4051
4052 if (fatal) {
4053 if (!hostdata->dstat_valid) {
4054 hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
4055 hostdata->dstat_valid = 1;
4056 }
4057
4058 if (!(hostdata->dstat & DSTAT_DFE)) {
4059 printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
4060 /*
4061 * Really need to check this code for 710 RGH.
4062 * Havn't seen any problems, but maybe we should FLUSH before
4063 * clearing sometimes.
4064 */
4065 NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
4066 while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF)
4067 ;
4068 hostdata->dstat |= DSTAT_DFE;
4069 }
4070 }
4071}
4072
4073#ifdef CYCLIC_TRACE
4074
4075/*
4076 * The following implements a cyclic log of instructions executed, if you turn
4077 * TRACE on. It will also print the log for you. Very useful when debugging
4078 * 53c710 support, possibly not really needed any more.
4079 */
4080
4081u32 insn_log[4096];
4082u32 insn_log_index = 0;
4083
4084void log1 (u32 i)
4085{
4086 insn_log[insn_log_index++] = i;
4087 if (insn_log_index == 4096)
4088 insn_log_index = 0;
4089}
4090
4091void log_insn (u32 *ip)
4092{
4093 log1 ((u32)ip);
4094 log1 (*ip);
4095 log1 (*(ip+1));
4096 if (((*ip >> 24) & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)
4097 log1 (*(ip+2));
4098}
4099
4100void dump_log(void)
4101{
4102 int cnt = 0;
4103 int i = insn_log_index;
4104 int size;
4105 struct Scsi_Host *host = first_host;
4106
4107 while (cnt < 4096) {
4108 printk ("%08x (+%6x): ", insn_log[i], (insn_log[i] - (u32)&(((struct NCR53c7x0_hostdata *)host->hostdata[0])->script))/4);
4109 if (++i == 4096)
4110 i = 0;
4111 cnt++;
4112 if (((insn_log[i] >> 24) & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)
4113 size = 3;
4114 else
4115 size = 2;
4116 while (size--) {
4117 printk ("%08x ", insn_log[i]);
4118 if (++i == 4096)
4119 i = 0;
4120 cnt++;
4121 }
4122 printk ("\n");
4123 }
4124}
4125#endif
4126
4127
4128/*
4129 * Function : static void NCR53c7x0_intfly (struct Scsi_Host *host)
4130 *
4131 * Purpose : Scan command queue for specified host, looking for completed
4132 * commands.
4133 *
4134 * Inputs : Scsi_Host pointer.
4135 *
4136 * This is called from the interrupt handler, when a simulated INTFLY
4137 * interrupt occurs.
4138 */
4139
4140static void
4141NCR53c7x0_intfly (struct Scsi_Host *host)
4142{
4143 NCR53c7x0_local_declare();
4144 struct NCR53c7x0_hostdata *hostdata; /* host->hostdata[0] */
4145 struct NCR53c7x0_cmd *cmd, /* command which halted */
4146 **cmd_prev_ptr;
4147 unsigned long flags;
4148 char search_found = 0; /* Got at least one ? */
4149
4150 hostdata = (struct NCR53c7x0_hostdata *) host->hostdata[0];
4151 NCR53c7x0_local_setup(host);
4152
4153 if (hostdata->options & OPTION_DEBUG_INTR)
4154 printk ("scsi%d : INTFLY\n", host->host_no);
4155
4156 /*
4157 * Traverse our list of running commands, and look
4158 * for those with valid (non-0xff ff) status and message
4159 * bytes encoded in the result which signify command
4160 * completion.
4161 */
4162
4163 local_irq_save(flags);
4164restart:
4165 for (cmd_prev_ptr = (struct NCR53c7x0_cmd **)&(hostdata->running_list),
4166 cmd = (struct NCR53c7x0_cmd *) hostdata->running_list; cmd ;
4167 cmd_prev_ptr = (struct NCR53c7x0_cmd **) &(cmd->next),
4168 cmd = (struct NCR53c7x0_cmd *) cmd->next)
4169 {
4170 Scsi_Cmnd *tmp;
4171
4172 if (!cmd) {
4173 printk("scsi%d : very weird.\n", host->host_no);
4174 break;
4175 }
4176
4177 if (!(tmp = cmd->cmd)) {
4178 printk("scsi%d : weird. NCR53c7x0_cmd has no Scsi_Cmnd\n",
4179 host->host_no);
4180 continue;
4181 }
4182 /* Copy the result over now; may not be complete,
4183 * but subsequent tests may as well be done on
4184 * cached memory.
4185 */
4186 tmp->result = cmd->result;
4187
4188 if (((tmp->result & 0xff) == 0xff) ||
4189 ((tmp->result & 0xff00) == 0xff00))
4190 continue;
4191
4192 search_found = 1;
4193
4194 if (cmd->bounce.len)
4195 memcpy ((void *)cmd->bounce.addr,
4196 (void *)cmd->bounce.buf, cmd->bounce.len);
4197
4198 /* Important - remove from list _before_ done is called */
4199 if (cmd_prev_ptr)
4200 *cmd_prev_ptr = (struct NCR53c7x0_cmd *) cmd->next;
4201
4202 --hostdata->busy[tmp->device->id][tmp->device->lun];
4203 cmd->next = hostdata->free;
4204 hostdata->free = cmd;
4205
4206 tmp->host_scribble = NULL;
4207
4208 if (hostdata->options & OPTION_DEBUG_INTR) {
4209 printk ("scsi%d : command complete : pid %lu, id %d,lun %d result 0x%x ",
4210 host->host_no, tmp->pid, tmp->device->id, tmp->device->lun, tmp->result);
4211 print_command (tmp->cmnd);
4212 }
4213
4214 tmp->scsi_done(tmp);
4215 goto restart;
4216 }
4217 local_irq_restore(flags);
4218
4219 if (!search_found) {
4220 printk ("scsi%d : WARNING : INTFLY with no completed commands.\n",
4221 host->host_no);
4222 } else {
4223 run_process_issue_queue();
4224 }
4225 return;
4226}
4227
4228/*
4229 * Function : static irqreturn_t NCR53c7x0_intr (int irq, void *dev_id, struct pt_regs * regs)
4230 *
4231 * Purpose : handle NCR53c7x0 interrupts for all NCR devices sharing
4232 * the same IRQ line.
4233 *
4234 * Inputs : Since we're using the SA_INTERRUPT interrupt handler
4235 * semantics, irq indicates the interrupt which invoked
4236 * this handler.
4237 *
4238 * On the 710 we simualte an INTFLY with a script interrupt, and the
4239 * script interrupt handler will call back to this function.
4240 */
4241
4242static irqreturn_t
4243NCR53c7x0_intr (int irq, void *dev_id, struct pt_regs * regs)
4244{
4245 NCR53c7x0_local_declare();
4246 struct Scsi_Host *host; /* Host we are looking at */
4247 unsigned char istat; /* Values of interrupt regs */
4248 struct NCR53c7x0_hostdata *hostdata; /* host->hostdata[0] */
4249 struct NCR53c7x0_cmd *cmd; /* command which halted */
4250 u32 *dsa; /* DSA */
4251 int handled = 0;
4252
4253#ifdef NCR_DEBUG
4254 char buf[80]; /* Debugging sprintf buffer */
4255 size_t buflen; /* Length of same */
4256#endif
4257
4258 host = (struct Scsi_Host *)dev_id;
4259 hostdata = (struct NCR53c7x0_hostdata *) host->hostdata[0];
4260 NCR53c7x0_local_setup(host);
4261
4262 /*
4263 * Only read istat once per loop, since reading it again will unstack
4264 * interrupts
4265 */
4266
4267 while ((istat = NCR53c7x0_read8(hostdata->istat)) & (ISTAT_SIP|ISTAT_DIP)) {
4268 handled = 1;
4269 hostdata->dsp_changed = 0;
4270 hostdata->dstat_valid = 0;
4271 hostdata->state = STATE_HALTED;
4272
4273 if (NCR53c7x0_read8 (SSTAT2_REG) & SSTAT2_FF_MASK)
4274 printk ("scsi%d : SCSI FIFO not empty\n", host->host_no);
4275
4276 /*
4277 * NCR53c700 and NCR53c700-66 change the current SCSI
4278 * process, hostdata->ncrcurrent, in the Linux driver so
4279 * cmd = hostdata->ncrcurrent.
4280 *
4281 * With other chips, we must look through the commands
4282 * executing and find the command structure which
4283 * corresponds to the DSA register.
4284 */
4285
4286 if (hostdata->options & OPTION_700) {
4287 cmd = (struct NCR53c7x0_cmd *) hostdata->ncrcurrent;
4288 } else {
4289 dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
4290 for (cmd = (struct NCR53c7x0_cmd *) hostdata->running_list;
4291 cmd && (dsa + (hostdata->dsa_start / sizeof(u32))) != cmd->dsa;
4292 cmd = (struct NCR53c7x0_cmd *)(cmd->next))
4293 ;
4294 }
4295 if (hostdata->options & OPTION_DEBUG_INTR) {
4296 if (cmd) {
4297 printk("scsi%d : interrupt for pid %lu, id %d, lun %d ",
4298 host->host_no, cmd->cmd->pid, (int) cmd->cmd->device->id,
4299 (int) cmd->cmd->device->lun);
4300 print_command (cmd->cmd->cmnd);
4301 } else {
4302 printk("scsi%d : no active command\n", host->host_no);
4303 }
4304 }
4305
4306 if (istat & ISTAT_SIP) {
4307 if (hostdata->options & OPTION_DEBUG_INTR)
4308 printk ("scsi%d : ISTAT_SIP\n", host->host_no);
4309 intr_scsi (host, cmd);
4310 }
4311
4312 if (istat & ISTAT_DIP) {
4313 if (hostdata->options & OPTION_DEBUG_INTR)
4314 printk ("scsi%d : ISTAT_DIP\n", host->host_no);
4315 intr_dma (host, cmd);
4316 }
4317
4318 if (!hostdata->dstat_valid) {
4319 hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
4320 hostdata->dstat_valid = 1;
4321 }
4322
4323 if (!(hostdata->dstat & DSTAT_DFE)) {
4324 printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
4325 /* Really need to check this out for 710 RGH */
4326 NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
4327 while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF)
4328 ;
4329 hostdata->dstat |= DSTAT_DFE;
4330 }
4331
4332 if (!hostdata->idle && hostdata->state == STATE_HALTED) {
4333 if (!hostdata->dsp_changed)
4334 hostdata->dsp = (u32 *)bus_to_virt(NCR53c7x0_read32(DSP_REG));
4335#if 0
4336 printk("scsi%d : new dsp is 0x%lx (virt 0x%p)\n",
4337 host->host_no, virt_to_bus(hostdata->dsp), hostdata->dsp);
4338#endif
4339
4340 hostdata->state = STATE_RUNNING;
4341 NCR53c7x0_write32 (DSP_REG, virt_to_bus(hostdata->dsp));
4342 if (hostdata->options & OPTION_DEBUG_TRACE) {
4343#ifdef CYCLIC_TRACE
4344 log_insn (hostdata->dsp);
4345#else
4346 print_insn (host, hostdata->dsp, "t ", 1);
4347#endif
4348 NCR53c7x0_write8 (DCNTL_REG,
4349 hostdata->saved_dcntl | DCNTL_SSM | DCNTL_STD);
4350 }
4351 }
4352 }
4353 return IRQ_HANDLED;
4354}
4355
4356
4357/*
4358 * Function : static int abort_connected (struct Scsi_Host *host)
4359 *
4360 * Purpose : Assuming that the NCR SCSI processor is currently
4361 * halted, break the currently established nexus. Clean
4362 * up of the NCR53c7x0_cmd and Scsi_Cmnd structures should
4363 * be done on receipt of the abort interrupt.
4364 *
4365 * Inputs : host - SCSI host
4366 *
4367 */
4368
4369static int
4370abort_connected (struct Scsi_Host *host) {
4371#ifdef NEW_ABORT
4372 NCR53c7x0_local_declare();
4373#endif
4374 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
4375 host->hostdata[0];
4376/* FIXME : this probably should change for production kernels; at the
4377 least, counter should move to a per-host structure. */
4378 static int counter = 5;
4379#ifdef NEW_ABORT
4380 int sstat, phase, offset;
4381 u32 *script;
4382 NCR53c7x0_local_setup(host);
4383#endif
4384
4385 if (--counter <= 0) {
4386 disable(host);
4387 return 0;
4388 }
4389
4390 printk ("scsi%d : DANGER : abort_connected() called \n",
4391 host->host_no);
4392
4393#ifdef NEW_ABORT
4394
4395/*
4396 * New strategy : Rather than using a generic abort routine,
4397 * we'll specifically try to source or sink the appropriate
4398 * amount of data for the phase we're currently in (taking into
4399 * account the current synchronous offset)
4400 */
4401
4402 sstat = (NCR53c8x0_read8 (SSTAT2_REG);
4403 offset = OFFSET (sstat & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
4404 phase = sstat & SSTAT2_PHASE_MASK;
4405
4406/*
4407 * SET ATN
4408 * MOVE source_or_sink, WHEN CURRENT PHASE
4409 * < repeat for each outstanding byte >
4410 * JUMP send_abort_message
4411 */
4412
4413 script = hostdata->abort_script = kmalloc (
4414 8 /* instruction size */ * (
4415 1 /* set ATN */ +
4416 (!offset ? 1 : offset) /* One transfer per outstanding byte */ +
4417 1 /* send abort message */),
4418 GFP_ATOMIC);
4419
4420
4421#else /* def NEW_ABORT */
4422 hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
4423 sizeof(u32);
4424#endif /* def NEW_ABORT */
4425 hostdata->dsp_changed = 1;
4426
4427/* XXX - need to flag the command as aborted after the abort_connected
4428 code runs
4429 */
4430 return 0;
4431}
4432
4433/*
4434 * Function : static int datapath_residual (Scsi_Host *host)
4435 *
4436 * Purpose : return residual data count of what's in the chip.
4437 *
4438 * Inputs : host - SCSI host
4439 */
4440
4441static int
4442datapath_residual (struct Scsi_Host *host) {
4443 NCR53c7x0_local_declare();
4444 int count, synchronous, sstat;
4445 unsigned int ddir;
4446
4447 NCR53c7x0_local_setup(host);
4448 /* COMPAT : the 700 and 700-66 need to use DFIFO_00_BO_MASK */
4449 count = ((NCR53c7x0_read8 (DFIFO_REG) & DFIFO_10_BO_MASK) -
4450 (NCR53c7x0_read32 (DBC_REG) & DFIFO_10_BO_MASK)) & DFIFO_10_BO_MASK;
4451 synchronous = NCR53c7x0_read8 (SXFER_REG) & SXFER_MO_MASK;
4452 /* COMPAT : DDIR is elsewhere on non-'8xx chips. */
4453 ddir = NCR53c7x0_read8 (CTEST0_REG_700) & CTEST0_700_DDIR;
4454
4455 if (ddir) {
4456 /* Receive */
4457 if (synchronous)
4458 count += (NCR53c7x0_read8 (SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
4459 else
4460 if (NCR53c7x0_read8 (SSTAT1_REG) & SSTAT1_ILF)
4461 ++count;
4462 } else {
4463 /* Send */
4464 sstat = NCR53c7x0_read8 (SSTAT1_REG);
4465 if (sstat & SSTAT1_OLF)
4466 ++count;
4467 if (synchronous && (sstat & SSTAT1_ORF))
4468 ++count;
4469 }
4470 return count;
4471}
4472
4473/*
4474 * Function : static const char * sbcl_to_phase (int sbcl)_
4475 *
4476 * Purpose : Convert SBCL register to user-parsable phase representation
4477 *
4478 * Inputs : sbcl - value of sbcl register
4479 */
4480
4481
4482static const char *
4483sbcl_to_phase (int sbcl) {
4484 switch (sbcl & SBCL_PHASE_MASK) {
4485 case SBCL_PHASE_DATAIN:
4486 return "DATAIN";
4487 case SBCL_PHASE_DATAOUT:
4488 return "DATAOUT";
4489 case SBCL_PHASE_MSGIN:
4490 return "MSGIN";
4491 case SBCL_PHASE_MSGOUT:
4492 return "MSGOUT";
4493 case SBCL_PHASE_CMDOUT:
4494 return "CMDOUT";
4495 case SBCL_PHASE_STATIN:
4496 return "STATUSIN";
4497 default:
4498 return "unknown";
4499 }
4500}
4501
4502/*
4503 * Function : static const char * sstat2_to_phase (int sstat)_
4504 *
4505 * Purpose : Convert SSTAT2 register to user-parsable phase representation
4506 *
4507 * Inputs : sstat - value of sstat register
4508 */
4509
4510
4511static const char *
4512sstat2_to_phase (int sstat) {
4513 switch (sstat & SSTAT2_PHASE_MASK) {
4514 case SSTAT2_PHASE_DATAIN:
4515 return "DATAIN";
4516 case SSTAT2_PHASE_DATAOUT:
4517 return "DATAOUT";
4518 case SSTAT2_PHASE_MSGIN:
4519 return "MSGIN";
4520 case SSTAT2_PHASE_MSGOUT:
4521 return "MSGOUT";
4522 case SSTAT2_PHASE_CMDOUT:
4523 return "CMDOUT";
4524 case SSTAT2_PHASE_STATIN:
4525 return "STATUSIN";
4526 default:
4527 return "unknown";
4528 }
4529}
4530
4531/*
4532 * Function : static void intr_phase_mismatch (struct Scsi_Host *host,
4533 * struct NCR53c7x0_cmd *cmd)
4534 *
4535 * Purpose : Handle phase mismatch interrupts
4536 *
4537 * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
4538 * may be NULL.
4539 *
4540 * Side effects : The abort_connected() routine is called or the NCR chip
4541 * is restarted, jumping to the command_complete entry point, or
4542 * patching the address and transfer count of the current instruction
4543 * and calling the msg_in entry point as appropriate.
4544 */
4545
4546static void
4547intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
4548 NCR53c7x0_local_declare();
4549 u32 dbc_dcmd, *dsp, *dsp_next;
4550 unsigned char dcmd, sbcl;
4551 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
4552 host->hostdata[0];
4553 int residual;
4554 enum {ACTION_ABORT, ACTION_ABORT_PRINT, ACTION_CONTINUE} action =
4555 ACTION_ABORT_PRINT;
4556 const char *where = NULL;
4557
4558 NCR53c7x0_local_setup(host);
4559
4560 /*
4561 * Corrective action is based on where in the SCSI SCRIPT(tm) the error
4562 * occurred, as well as which SCSI phase we are currently in.
4563 */
4564 dsp_next = bus_to_virt(NCR53c7x0_read32(DSP_REG));
4565
4566 /*
4567 * Fetch the current instruction, and remove the operands for easier
4568 * interpretation.
4569 */
4570 dbc_dcmd = NCR53c7x0_read32(DBC_REG);
4571 dcmd = (dbc_dcmd & 0xff000000) >> 24;
4572 /*
4573 * Like other processors, the NCR adjusts the instruction pointer before
4574 * instruction decode. Set the DSP address back to what it should
4575 * be for this instruction based on its size (2 or 3 32 bit words).
4576 */
4577 dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
4578
4579
4580 /*
4581 * Read new SCSI phase from the SBCL lines. Since all of our code uses
4582 * a WHEN conditional instead of an IF conditional, we don't need to
4583 * wait for a new REQ.
4584 */
4585 sbcl = NCR53c7x0_read8(SBCL_REG) & SBCL_PHASE_MASK;
4586
4587 if (!cmd) {
4588 action = ACTION_ABORT_PRINT;
4589 where = "no current command";
4590 /*
4591 * The way my SCSI SCRIPTS(tm) are architected, recoverable phase
4592 * mismatches should only occur where we're doing a multi-byte
4593 * BMI instruction. Specifically, this means
4594 *
4595 * - select messages (a SCSI-I target may ignore additional messages
4596 * after the IDENTIFY; any target may reject a SDTR or WDTR)
4597 *
4598 * - command out (targets may send a message to signal an error
4599 * condition, or go into STATUSIN after they've decided
4600 * they don't like the command.
4601 *
4602 * - reply_message (targets may reject a multi-byte message in the
4603 * middle)
4604 *
4605 * - data transfer routines (command completion with buffer space
4606 * left, disconnect message, or error message)
4607 */
4608 } else if (((dsp >= cmd->data_transfer_start &&
4609 dsp < cmd->data_transfer_end)) || dsp == (cmd->residual + 2)) {
4610 if ((dcmd & (DCMD_TYPE_MASK|DCMD_BMI_OP_MASK|DCMD_BMI_INDIRECT|
4611 DCMD_BMI_MSG|DCMD_BMI_CD)) == (DCMD_TYPE_BMI|
4612 DCMD_BMI_OP_MOVE_I)) {
4613 residual = datapath_residual (host);
4614 if (hostdata->options & OPTION_DEBUG_DISCONNECT)
4615 printk ("scsi%d : handling residual transfer (+ %d bytes from DMA FIFO)\n",
4616 host->host_no, residual);
4617
4618 /*
4619 * The first instruction is a CALL to the alternate handler for
4620 * this data transfer phase, so we can do calls to
4621 * munge_msg_restart as we would if control were passed
4622 * from normal dynamic code.
4623 */
4624 if (dsp != cmd->residual + 2) {
4625 cmd->residual[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL |
4626 ((dcmd & DCMD_BMI_IO) ? DCMD_TCI_IO : 0)) << 24) |
4627 DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
4628 cmd->residual[1] = virt_to_bus(hostdata->script)
4629 + ((dcmd & DCMD_BMI_IO)
4630 ? hostdata->E_other_in : hostdata->E_other_out);
4631 }
4632
4633 /*
4634 * The second instruction is the a data transfer block
4635 * move instruction, reflecting the pointer and count at the
4636 * time of the phase mismatch.
4637 */
4638 cmd->residual[2] = dbc_dcmd + residual;
4639 cmd->residual[3] = NCR53c7x0_read32(DNAD_REG) - residual;
4640
4641 /*
4642 * The third and final instruction is a jump to the instruction
4643 * which follows the instruction which had to be 'split'
4644 */
4645 if (dsp != cmd->residual + 2) {
4646 cmd->residual[4] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP)
4647 << 24) | DBC_TCI_TRUE;
4648 cmd->residual[5] = virt_to_bus(dsp_next);
4649 }
4650
4651 /*
4652 * For the sake of simplicity, transfer control to the
4653 * conditional CALL at the start of the residual buffer.
4654 */
4655 hostdata->dsp = cmd->residual;
4656 hostdata->dsp_changed = 1;
4657 action = ACTION_CONTINUE;
4658 } else {
4659 where = "non-BMI dynamic DSA code";
4660 action = ACTION_ABORT_PRINT;
4661 }
4662 } else if (dsp == (hostdata->script + hostdata->E_select_msgout / 4 + 2)) {
4663 /* RGH 290697: Added +2 above, to compensate for the script
4664 * instruction which disables the selection timer. */
4665 /* Release ATN */
4666 NCR53c7x0_write8 (SOCL_REG, 0);
4667 switch (sbcl) {
4668 /*
4669 * Some devices (SQ555 come to mind) grab the IDENTIFY message
4670 * sent on selection, and decide to go into COMMAND OUT phase
4671 * rather than accepting the rest of the messages or rejecting
4672 * them. Handle these devices gracefully.
4673 */
4674 case SBCL_PHASE_CMDOUT:
4675 hostdata->dsp = dsp + 2 /* two _words_ */;
4676 hostdata->dsp_changed = 1;
4677 printk ("scsi%d : target %d ignored SDTR and went into COMMAND OUT\n",
4678 host->host_no, cmd->cmd->device->id);
4679 cmd->flags &= ~CMD_FLAG_SDTR;
4680 action = ACTION_CONTINUE;
4681 break;
4682 case SBCL_PHASE_MSGIN:
4683 hostdata->dsp = hostdata->script + hostdata->E_msg_in /
4684 sizeof(u32);
4685 hostdata->dsp_changed = 1;
4686 action = ACTION_CONTINUE;
4687 break;
4688 default:
4689 where="select message out";
4690 action = ACTION_ABORT_PRINT;
4691 }
4692 /*
4693 * Some SCSI devices will interpret a command as they read the bytes
4694 * off the SCSI bus, and may decide that the command is Bogus before
4695 * they've read the entire command off the bus.
4696 */
4697 } else if (dsp == hostdata->script + hostdata->E_cmdout_cmdout / sizeof
4698 (u32)) {
4699 hostdata->dsp = hostdata->script + hostdata->E_data_transfer /
4700 sizeof (u32);
4701 hostdata->dsp_changed = 1;
4702 action = ACTION_CONTINUE;
4703 /* FIXME : we need to handle message reject, etc. within msg_respond. */
4704#ifdef notyet
4705 } else if (dsp == hostdata->script + hostdata->E_reply_message) {
4706 switch (sbcl) {
4707 /* Any other phase mismatches abort the currently executing command. */
4708#endif
4709 } else {
4710 where = "unknown location";
4711 action = ACTION_ABORT_PRINT;
4712 }
4713
4714 /* Flush DMA FIFO */
4715 if (!hostdata->dstat_valid) {
4716 hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
4717 hostdata->dstat_valid = 1;
4718 }
4719 if (!(hostdata->dstat & DSTAT_DFE)) {
4720 /* Really need to check this out for 710 RGH */
4721 NCR53c7x0_write8 (CTEST8_REG, CTEST8_10_CLF);
4722 while (NCR53c7x0_read8 (CTEST8_REG) & CTEST8_10_CLF);
4723 hostdata->dstat |= DSTAT_DFE;
4724 }
4725
4726 switch (action) {
4727 case ACTION_ABORT_PRINT:
4728 printk("scsi%d : %s : unexpected phase %s.\n",
4729 host->host_no, where ? where : "unknown location",
4730 sbcl_to_phase(sbcl));
4731 print_lots (host);
4732 /* Fall through to ACTION_ABORT */
4733 case ACTION_ABORT:
4734 abort_connected (host);
4735 break;
4736 case ACTION_CONTINUE:
4737 break;
4738 }
4739
4740#if 0
4741 if (hostdata->dsp_changed) {
4742 printk("scsi%d: new dsp 0x%p\n", host->host_no, hostdata->dsp);
4743 print_insn (host, hostdata->dsp, "", 1);
4744 }
4745#endif
4746}
4747
4748/*
4749 * Function : static void intr_bf (struct Scsi_Host *host,
4750 * struct NCR53c7x0_cmd *cmd)
4751 *
4752 * Purpose : handle BUS FAULT interrupts
4753 *
4754 * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
4755 * may be NULL.
4756 */
4757
4758static void
4759intr_bf (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
4760 NCR53c7x0_local_declare();
4761 u32 *dsp,
4762 *next_dsp, /* Current dsp */
4763 *dsa,
4764 dbc_dcmd; /* DCMD (high eight bits) + DBC */
4765 char *reason = NULL;
4766 /* Default behavior is for a silent error, with a retry until we've
4767 exhausted retries. */
4768 enum {MAYBE, ALWAYS, NEVER} retry = MAYBE;
4769 int report = 0;
4770 NCR53c7x0_local_setup(host);
4771
4772 dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
4773 next_dsp = bus_to_virt (NCR53c7x0_read32(DSP_REG));
4774 dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
4775/* FIXME - check chip type */
4776 dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
4777
4778 /*
4779 * Bus faults can be caused by either a Bad Address or
4780 * Target Abort. We should check the Received Target Abort
4781 * bit of the PCI status register and Master Abort Bit.
4782 *
4783 * - Master Abort bit indicates that no device claimed
4784 * the address with DEVSEL within five clocks
4785 *
4786 * - Target Abort bit indicates that a target claimed it,
4787 * but changed its mind once it saw the byte enables.
4788 *
4789 */
4790
4791 /* 53c710, not PCI system */
4792 report = 1;
4793 reason = "Unknown";
4794
4795#ifndef notyet
4796 report = 1;
4797#endif
4798 if (report && reason)
4799 {
4800 printk(KERN_ALERT "scsi%d : BUS FAULT reason = %s\n",
4801 host->host_no, reason ? reason : "unknown");
4802 print_lots (host);
4803 }
4804
4805#ifndef notyet
4806 retry = NEVER;
4807#endif
4808
4809 /*
4810 * TODO : we should attempt to recover from any spurious bus
4811 * faults. After X retries, we should figure that things are
4812 * sufficiently wedged, and call NCR53c7xx_reset.
4813 *
4814 * This code should only get executed once we've decided that we
4815 * cannot retry.
4816 */
4817
4818 if (retry == NEVER) {
4819 printk(KERN_ALERT " mail richard@sleepie.demon.co.uk\n");
4820 FATAL (host);
4821 }
4822}
4823
4824/*
4825 * Function : static void intr_dma (struct Scsi_Host *host,
4826 * struct NCR53c7x0_cmd *cmd)
4827 *
4828 * Purpose : handle all DMA interrupts, indicated by the setting
4829 * of the DIP bit in the ISTAT register.
4830 *
4831 * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
4832 * may be NULL.
4833 */
4834
4835static void
4836intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
4837 NCR53c7x0_local_declare();
4838 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
4839 host->hostdata[0];
4840 unsigned char dstat; /* DSTAT */
4841 u32 *dsp,
4842 *next_dsp, /* Current dsp */
4843 *dsa,
4844 dbc_dcmd; /* DCMD (high eight bits) + DBC */
4845 int tmp;
4846 unsigned long flags;
4847 NCR53c7x0_local_setup(host);
4848
4849 if (!hostdata->dstat_valid) {
4850 hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
4851 hostdata->dstat_valid = 1;
4852 }
4853
4854 dstat = hostdata->dstat;
4855
4856 if (hostdata->options & OPTION_DEBUG_INTR)
4857 printk("scsi%d : DSTAT=0x%x\n", host->host_no, (int) dstat);
4858
4859 dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
4860 next_dsp = bus_to_virt(NCR53c7x0_read32(DSP_REG));
4861 dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
4862/* XXX - check chip type */
4863 dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
4864
4865 /*
4866 * DSTAT_ABRT is the aborted interrupt. This is set whenever the
4867 * SCSI chip is aborted.
4868 *
4869 * With NCR53c700 and NCR53c700-66 style chips, we should only
4870 * get this when the chip is currently running the accept
4871 * reselect/select code and we have set the abort bit in the
4872 * ISTAT register.
4873 *
4874 */
4875
4876 if (dstat & DSTAT_ABRT) {
4877#if 0
4878 /* XXX - add code here to deal with normal abort */
4879 if ((hostdata->options & OPTION_700) && (hostdata->state ==
4880 STATE_ABORTING)) {
4881 } else
4882#endif
4883 {
4884 printk(KERN_ALERT "scsi%d : unexpected abort interrupt at\n"
4885 " ", host->host_no);
4886 print_insn (host, dsp, KERN_ALERT "s ", 1);
4887 FATAL (host);
4888 }
4889 }
4890
4891 /*
4892 * DSTAT_SSI is the single step interrupt. Should be generated
4893 * whenever we have single stepped or are tracing.
4894 */
4895
4896 if (dstat & DSTAT_SSI) {
4897 if (hostdata->options & OPTION_DEBUG_TRACE) {
4898 /* Don't print instr. until we write DSP at end of intr function */
4899 } else if (hostdata->options & OPTION_DEBUG_SINGLE) {
4900 print_insn (host, dsp, "s ", 0);
4901 local_irq_save(flags);
4902/* XXX - should we do this, or can we get away with writing dsp? */
4903
4904 NCR53c7x0_write8 (DCNTL_REG, (NCR53c7x0_read8(DCNTL_REG) &
4905 ~DCNTL_SSM) | DCNTL_STD);
4906 local_irq_restore(flags);
4907 } else {
4908 printk(KERN_ALERT "scsi%d : unexpected single step interrupt at\n"
4909 " ", host->host_no);
4910 print_insn (host, dsp, KERN_ALERT "", 1);
4911 printk(KERN_ALERT " mail drew@PoohSticks.ORG\n");
4912 FATAL (host);
4913 }
4914 }
4915
4916 /*
4917 * DSTAT_IID / DSTAT_OPC (same bit, same meaning, only the name
4918 * is different) is generated whenever an illegal instruction is
4919 * encountered.
4920 *
4921 * XXX - we may want to emulate INTFLY here, so we can use
4922 * the same SCSI SCRIPT (tm) for NCR53c710 through NCR53c810
4923 * chips.
4924 */
4925
4926 if (dstat & DSTAT_OPC) {
4927 /*
4928 * Ascertain if this IID interrupts occurred before or after a STO
4929 * interrupt. Since the interrupt handling code now leaves
4930 * DSP unmodified until _after_ all stacked interrupts have been
4931 * processed, reading the DSP returns the original DSP register.
4932 * This means that if dsp lies between the select code, and
4933 * message out following the selection code (where the IID interrupt
4934 * would have to have occurred by due to the implicit wait for REQ),
4935 * we have an IID interrupt resulting from a STO condition and
4936 * can ignore it.
4937 */
4938
4939 if (((dsp >= (hostdata->script + hostdata->E_select / sizeof(u32))) &&
4940 (dsp <= (hostdata->script + hostdata->E_select_msgout /
4941 sizeof(u32) + 8))) || (hostdata->test_running == 2)) {
4942 if (hostdata->options & OPTION_DEBUG_INTR)
4943 printk ("scsi%d : ignoring DSTAT_IID for SSTAT_STO\n",
4944 host->host_no);
4945 if (hostdata->expecting_iid) {
4946 hostdata->expecting_iid = 0;
4947 hostdata->idle = 1;
4948 if (hostdata->test_running == 2) {
4949 hostdata->test_running = 0;
4950 hostdata->test_completed = 3;
4951 } else if (cmd)
4952 abnormal_finished (cmd, DID_BAD_TARGET << 16);
4953 } else {
4954 hostdata->expecting_sto = 1;
4955 }
4956 /*
4957 * We can't guarantee we'll be able to execute the WAIT DISCONNECT
4958 * instruction within the 3.4us of bus free and arbitration delay
4959 * that a target can RESELECT in and assert REQ after we've dropped
4960 * ACK. If this happens, we'll get an illegal instruction interrupt.
4961 * Doing away with the WAIT DISCONNECT instructions broke everything,
4962 * so instead I'll settle for moving one WAIT DISCONNECT a few
4963 * instructions closer to the CLEAR ACK before it to minimize the
4964 * chances of this happening, and handle it if it occurs anyway.
4965 *
4966 * Simply continue with what we were doing, and control should
4967 * be transferred to the schedule routine which will ultimately
4968 * pass control onto the reselection or selection (not yet)
4969 * code.
4970 */
4971 } else if (dbc_dcmd == 0x48000000 && (NCR53c7x0_read8 (SBCL_REG) &
4972 SBCL_REQ)) {
4973 if (!(hostdata->options & OPTION_NO_PRINT_RACE))
4974 {
4975 printk("scsi%d: REQ before WAIT DISCONNECT IID\n",
4976 host->host_no);
4977 hostdata->options |= OPTION_NO_PRINT_RACE;
4978 }
4979 } else {
4980 printk(KERN_ALERT "scsi%d : invalid instruction\n", host->host_no);
4981 print_lots (host);
4982 printk(KERN_ALERT " mail Richard@sleepie.demon.co.uk with ALL\n"
4983 " boot messages and diagnostic output\n");
4984 FATAL (host);
4985 }
4986 }
4987
4988 /*
4989 * DSTAT_BF are bus fault errors. DSTAT_800_BF is valid for 710 also.
4990 */
4991
4992 if (dstat & DSTAT_800_BF) {
4993 intr_bf (host, cmd);
4994 }
4995
4996
4997 /*
4998 * DSTAT_SIR interrupts are generated by the execution of
4999 * the INT instruction. Since the exact values available
5000 * are determined entirely by the SCSI script running,
5001 * and are local to a particular script, a unique handler
5002 * is called for each script.
5003 */
5004
5005 if (dstat & DSTAT_SIR) {
5006 if (hostdata->options & OPTION_DEBUG_INTR)
5007 printk ("scsi%d : DSTAT_SIR\n", host->host_no);
5008 switch ((tmp = hostdata->dstat_sir_intr (host, cmd))) {
5009 case SPECIFIC_INT_NOTHING:
5010 case SPECIFIC_INT_RESTART:
5011 break;
5012 case SPECIFIC_INT_ABORT:
5013 abort_connected(host);
5014 break;
5015 case SPECIFIC_INT_PANIC:
5016 printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
5017 print_insn (host, dsp, KERN_ALERT "", 1);
5018 printk(KERN_ALERT " dstat_sir_intr() returned SPECIFIC_INT_PANIC\n");
5019 FATAL (host);
5020 break;
5021 case SPECIFIC_INT_BREAK:
5022 intr_break (host, cmd);
5023 break;
5024 default:
5025 printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
5026 print_insn (host, dsp, KERN_ALERT "", 1);
5027 printk(KERN_ALERT" dstat_sir_intr() returned unknown value %d\n",
5028 tmp);
5029 FATAL (host);
5030 }
5031 }
5032}
5033
5034/*
5035 * Function : static int print_insn (struct Scsi_Host *host,
5036 * u32 *insn, int kernel)
5037 *
5038 * Purpose : print numeric representation of the instruction pointed
5039 * to by insn to the debugging or kernel message buffer
5040 * as appropriate.
5041 *
5042 * If desired, a user level program can interpret this
5043 * information.
5044 *
5045 * Inputs : host, insn - host, pointer to instruction, prefix -
5046 * string to prepend, kernel - use printk instead of debugging buffer.
5047 *
5048 * Returns : size, in u32s, of instruction printed.
5049 */
5050
5051/*
5052 * FIXME: should change kernel parameter so that it takes an ENUM
5053 * specifying severity - either KERN_ALERT or KERN_PANIC so
5054 * all panic messages are output with the same severity.
5055 */
5056
5057static int
5058print_insn (struct Scsi_Host *host, const u32 *insn,
5059 const char *prefix, int kernel) {
5060 char buf[160], /* Temporary buffer and pointer. ICKY
5061 arbitrary length. */
5062
5063
5064 *tmp;
5065 unsigned char dcmd; /* dcmd register for *insn */
5066 int size;
5067
5068 /*
5069 * Check to see if the instruction pointer is not bogus before
5070 * indirecting through it; avoiding red-zone at start of
5071 * memory.
5072 *
5073 * FIXME: icky magic needs to happen here on non-intel boxes which
5074 * don't have kernel memory mapped in like this. Might be reasonable
5075 * to use vverify()?
5076 */
5077
5078 if (virt_to_phys((void *)insn) < PAGE_SIZE ||
5079 virt_to_phys((void *)(insn + 8)) > virt_to_phys(high_memory) ||
5080 ((((dcmd = (insn[0] >> 24) & 0xff) & DCMD_TYPE_MMI) == DCMD_TYPE_MMI) &&
5081 virt_to_phys((void *)(insn + 12)) > virt_to_phys(high_memory))) {
5082 size = 0;
5083 sprintf (buf, "%s%p: address out of range\n",
5084 prefix, insn);
5085 } else {
5086/*
5087 * FIXME : (void *) cast in virt_to_bus should be unnecessary, because
5088 * it should take const void * as argument.
5089 */
5090#if !defined(CONFIG_MVME16x) && !defined(CONFIG_BVME6000)
5091 sprintf(buf, "%s0x%lx (virt 0x%p) : 0x%08x 0x%08x (virt 0x%p)",
5092 (prefix ? prefix : ""), virt_to_bus((void *) insn), insn,
5093 insn[0], insn[1], bus_to_virt (insn[1]));
5094#else
5095 /* Remove virtual addresses to reduce output, as they are the same */
5096 sprintf(buf, "%s0x%x (+%x) : 0x%08x 0x%08x",
5097 (prefix ? prefix : ""), (u32)insn, ((u32)insn -
5098 (u32)&(((struct NCR53c7x0_hostdata *)host->hostdata[0])->script))/4,
5099 insn[0], insn[1]);
5100#endif
5101 tmp = buf + strlen(buf);
5102 if ((dcmd & DCMD_TYPE_MASK) == DCMD_TYPE_MMI) {
5103#if !defined(CONFIG_MVME16x) && !defined(CONFIG_BVME6000)
5104 sprintf (tmp, " 0x%08x (virt 0x%p)\n", insn[2],
5105 bus_to_virt(insn[2]));
5106#else
5107 /* Remove virtual addr to reduce output, as it is the same */
5108 sprintf (tmp, " 0x%08x\n", insn[2]);
5109#endif
5110 size = 3;
5111 } else {
5112 sprintf (tmp, "\n");
5113 size = 2;
5114 }
5115 }
5116
5117 if (kernel)
5118 printk ("%s", buf);
5119#ifdef NCR_DEBUG
5120 else {
5121 size_t len = strlen(buf);
5122 debugger_kernel_write(host, buf, len);
5123 }
5124#endif
5125 return size;
5126}
5127
5128/*
5129 * Function : int NCR53c7xx_abort (Scsi_Cmnd *cmd)
5130 *
5131 * Purpose : Abort an errant SCSI command, doing all necessary
5132 * cleanup of the issue_queue, running_list, shared Linux/NCR
5133 * dsa issue and reconnect queues.
5134 *
5135 * Inputs : cmd - command to abort, code - entire result field
5136 *
5137 * Returns : 0 on success, -1 on failure.
5138 */
5139
5140int
5141NCR53c7xx_abort (Scsi_Cmnd *cmd) {
5142 NCR53c7x0_local_declare();
5143 struct Scsi_Host *host = cmd->device->host;
5144 struct NCR53c7x0_hostdata *hostdata = host ? (struct NCR53c7x0_hostdata *)
5145 host->hostdata[0] : NULL;
5146 unsigned long flags;
5147 struct NCR53c7x0_cmd *curr, **prev;
5148 Scsi_Cmnd *me, **last;
5149#if 0
5150 static long cache_pid = -1;
5151#endif
5152
5153
5154 if (!host) {
5155 printk ("Bogus SCSI command pid %ld; no host structure\n",
5156 cmd->pid);
5157 return SCSI_ABORT_ERROR;
5158 } else if (!hostdata) {
5159 printk ("Bogus SCSI host %d; no hostdata\n", host->host_no);
5160 return SCSI_ABORT_ERROR;
5161 }
5162 NCR53c7x0_local_setup(host);
5163
5164/*
5165 * CHECK : I don't think that reading ISTAT will unstack any interrupts,
5166 * since we need to write the INTF bit to clear it, and SCSI/DMA
5167 * interrupts don't clear until we read SSTAT/SIST and DSTAT registers.
5168 *
5169 * See that this is the case. Appears to be correct on the 710, at least.
5170 *
5171 * I suspect that several of our failures may be coming from a new fatal
5172 * interrupt (possibly due to a phase mismatch) happening after we've left
5173 * the interrupt handler, but before the PIC has had the interrupt condition
5174 * cleared.
5175 */
5176
5177 if (NCR53c7x0_read8(hostdata->istat) & (ISTAT_DIP|ISTAT_SIP)) {
5178 printk ("scsi%d : dropped interrupt for command %ld\n", host->host_no,
5179 cmd->pid);
5180 NCR53c7x0_intr (host->irq, NULL, NULL);
5181 return SCSI_ABORT_BUSY;
5182 }
5183
5184 local_irq_save(flags);
5185#if 0
5186 if (cache_pid == cmd->pid)
5187 panic ("scsi%d : bloody fetus %d\n", host->host_no, cmd->pid);
5188 else
5189 cache_pid = cmd->pid;
5190#endif
5191
5192
5193/*
5194 * The command could be hiding in the issue_queue. This would be very
5195 * nice, as commands can't be moved from the high level driver's issue queue
5196 * into the shared queue until an interrupt routine is serviced, and this
5197 * moving is atomic.
5198 *
5199 * If this is the case, we don't have to worry about anything - we simply
5200 * pull the command out of the old queue, and call it aborted.
5201 */
5202
5203 for (me = (Scsi_Cmnd *) hostdata->issue_queue,
5204 last = (Scsi_Cmnd **) &(hostdata->issue_queue);
5205 me && me != cmd; last = (Scsi_Cmnd **)&(me->SCp.ptr),
5206 me = (Scsi_Cmnd *)me->SCp.ptr);
5207
5208 if (me) {
5209 *last = (Scsi_Cmnd *) me->SCp.ptr;
5210 if (me->host_scribble) {
5211 ((struct NCR53c7x0_cmd *)me->host_scribble)->next = hostdata->free;
5212 hostdata->free = (struct NCR53c7x0_cmd *) me->host_scribble;
5213 me->host_scribble = NULL;
5214 }
5215 cmd->result = DID_ABORT << 16;
5216 cmd->scsi_done(cmd);
5217 printk ("scsi%d : found command %ld in Linux issue queue\n",
5218 host->host_no, me->pid);
5219 local_irq_restore(flags);
5220 run_process_issue_queue();
5221 return SCSI_ABORT_SUCCESS;
5222 }
5223
5224/*
5225 * That failing, the command could be in our list of already executing
5226 * commands. If this is the case, drastic measures are called for.
5227 */
5228
5229 for (curr = (struct NCR53c7x0_cmd *) hostdata->running_list,
5230 prev = (struct NCR53c7x0_cmd **) &(hostdata->running_list);
5231 curr && curr->cmd != cmd; prev = (struct NCR53c7x0_cmd **)
5232 &(curr->next), curr = (struct NCR53c7x0_cmd *) curr->next);
5233
5234 if (curr) {
5235 if ((curr->result & 0xff) != 0xff && (curr->result & 0xff00) != 0xff00) {
5236 cmd->result = curr->result;
5237 if (prev)
5238 *prev = (struct NCR53c7x0_cmd *) curr->next;
5239 curr->next = (struct NCR53c7x0_cmd *) hostdata->free;
5240 cmd->host_scribble = NULL;
5241 hostdata->free = curr;
5242 cmd->scsi_done(cmd);
5243 printk ("scsi%d : found finished command %ld in running list\n",
5244 host->host_no, cmd->pid);
5245 local_irq_restore(flags);
5246 return SCSI_ABORT_NOT_RUNNING;
5247 } else {
5248 printk ("scsi%d : DANGER : command running, can not abort.\n",
5249 cmd->device->host->host_no);
5250 local_irq_restore(flags);
5251 return SCSI_ABORT_BUSY;
5252 }
5253 }
5254
5255/*
5256 * And if we couldn't find it in any of our queues, it must have been
5257 * a dropped interrupt.
5258 */
5259
5260 curr = (struct NCR53c7x0_cmd *) cmd->host_scribble;
5261 if (curr) {
5262 curr->next = hostdata->free;
5263 hostdata->free = curr;
5264 cmd->host_scribble = NULL;
5265 }
5266
5267 if (curr == NULL || ((curr->result & 0xff00) == 0xff00) ||
5268 ((curr->result & 0xff) == 0xff)) {
5269 printk ("scsi%d : did this command ever run?\n", host->host_no);
5270 cmd->result = DID_ABORT << 16;
5271 } else {
5272 printk ("scsi%d : probably lost INTFLY, normal completion\n",
5273 host->host_no);
5274 cmd->result = curr->result;
5275/*
5276 * FIXME : We need to add an additional flag which indicates if a
5277 * command was ever counted as BUSY, so if we end up here we can
5278 * decrement the busy count if and only if it is necessary.
5279 */
5280 --hostdata->busy[cmd->device->id][cmd->device->lun];
5281 }
5282 local_irq_restore(flags);
5283 cmd->scsi_done(cmd);
5284
5285/*
5286 * We need to run process_issue_queue since termination of this command
5287 * may allow another queued command to execute first?
5288 */
5289 return SCSI_ABORT_NOT_RUNNING;
5290}
5291
5292/*
5293 * Function : int NCR53c7xx_reset (Scsi_Cmnd *cmd)
5294 *
5295 * Purpose : perform a hard reset of the SCSI bus and NCR
5296 * chip.
5297 *
5298 * Inputs : cmd - command which caused the SCSI RESET
5299 *
5300 * Returns : 0 on success.
5301 */
5302
5303int
5304NCR53c7xx_reset (Scsi_Cmnd *cmd, unsigned int reset_flags) {
5305 NCR53c7x0_local_declare();
5306 unsigned long flags;
5307 int found = 0;
5308 struct NCR53c7x0_cmd * c;
5309 Scsi_Cmnd *tmp;
5310 /*
5311 * When we call scsi_done(), it's going to wake up anything sleeping on the
5312 * resources which were in use by the aborted commands, and we'll start to
5313 * get new commands.
5314 *
5315 * We can't let this happen until after we've re-initialized the driver
5316 * structures, and can't reinitialize those structures until after we've
5317 * dealt with their contents.
5318 *
5319 * So, we need to find all of the commands which were running, stick
5320 * them on a linked list of completed commands (we'll use the host_scribble
5321 * pointer), do our reinitialization, and then call the done function for
5322 * each command.
5323 */
5324 Scsi_Cmnd *nuke_list = NULL;
5325 struct Scsi_Host *host = cmd->device->host;
5326 struct NCR53c7x0_hostdata *hostdata =
5327 (struct NCR53c7x0_hostdata *) host->hostdata[0];
5328
5329 NCR53c7x0_local_setup(host);
5330 local_irq_save(flags);
5331 ncr_halt (host);
5332 print_lots (host);
5333 dump_events (host, 30);
5334 ncr_scsi_reset (host);
5335 for (tmp = nuke_list = return_outstanding_commands (host, 1 /* free */,
5336 0 /* issue */ ); tmp; tmp = (Scsi_Cmnd *) tmp->SCp.buffer)
5337 if (tmp == cmd) {
5338 found = 1;
5339 break;
5340 }
5341
5342 /*
5343 * If we didn't find the command which caused this reset in our running
5344 * list, then we've lost it. See that it terminates normally anyway.
5345 */
5346 if (!found) {
5347 c = (struct NCR53c7x0_cmd *) cmd->host_scribble;
5348 if (c) {
5349 cmd->host_scribble = NULL;
5350 c->next = hostdata->free;
5351 hostdata->free = c;
5352 } else
5353 printk ("scsi%d: lost command %ld\n", host->host_no, cmd->pid);
5354 cmd->SCp.buffer = (struct scatterlist *) nuke_list;
5355 nuke_list = cmd;
5356 }
5357
5358 NCR53c7x0_driver_init (host);
5359 hostdata->soft_reset (host);
5360 if (hostdata->resets == 0)
5361 disable(host);
5362 else if (hostdata->resets != -1)
5363 --hostdata->resets;
5364 local_irq_restore(flags);
5365 for (; nuke_list; nuke_list = tmp) {
5366 tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
5367 nuke_list->result = DID_RESET << 16;
5368 nuke_list->scsi_done (nuke_list);
5369 }
5370 local_irq_restore(flags);
5371 return SCSI_RESET_SUCCESS;
5372}
5373
5374/*
5375 * The NCR SDMS bios follows Annex A of the SCSI-CAM draft, and
5376 * therefore shares the scsicam_bios_param function.
5377 */
5378
5379/*
5380 * Function : int insn_to_offset (Scsi_Cmnd *cmd, u32 *insn)
5381 *
5382 * Purpose : convert instructions stored at NCR pointer into data
5383 * pointer offset.
5384 *
5385 * Inputs : cmd - SCSI command; insn - pointer to instruction. Either current
5386 * DSP, or saved data pointer.
5387 *
5388 * Returns : offset on success, -1 on failure.
5389 */
5390
5391
5392static int
5393insn_to_offset (Scsi_Cmnd *cmd, u32 *insn) {
5394 struct NCR53c7x0_hostdata *hostdata =
5395 (struct NCR53c7x0_hostdata *) cmd->device->host->hostdata[0];
5396 struct NCR53c7x0_cmd *ncmd =
5397 (struct NCR53c7x0_cmd *) cmd->host_scribble;
5398 int offset = 0, buffers;
5399 struct scatterlist *segment;
5400 char *ptr;
5401 int found = 0;
5402
5403/*
5404 * With the current code implementation, if the insn is inside dynamically
5405 * generated code, the data pointer will be the instruction preceding
5406 * the next transfer segment.
5407 */
5408
5409 if (!check_address ((unsigned long) ncmd, sizeof (struct NCR53c7x0_cmd)) &&
5410 ((insn >= ncmd->data_transfer_start &&
5411 insn < ncmd->data_transfer_end) ||
5412 (insn >= ncmd->residual &&
5413 insn < (ncmd->residual +
5414 sizeof(ncmd->residual))))) {
5415 ptr = bus_to_virt(insn[3]);
5416
5417 if ((buffers = cmd->use_sg)) {
5418 for (offset = 0,
5419 segment = (struct scatterlist *) cmd->buffer;
5420 buffers && !((found = ((ptr >= (char *)page_address(segment->page)+segment->offset) &&
5421 (ptr < ((char *)page_address(segment->page)+segment->offset+segment->length)))));
5422 --buffers, offset += segment->length, ++segment)
5423#if 0
5424 printk("scsi%d: comparing 0x%p to 0x%p\n",
5425 cmd->device->host->host_no, saved, page_address(segment->page+segment->offset);
5426#else
5427 ;
5428#endif
5429 offset += ptr - ((char *)page_address(segment->page)+segment->offset);
5430 } else {
5431 found = 1;
5432 offset = ptr - (char *) (cmd->request_buffer);
5433 }
5434 } else if ((insn >= hostdata->script +
5435 hostdata->E_data_transfer / sizeof(u32)) &&
5436 (insn <= hostdata->script +
5437 hostdata->E_end_data_transfer / sizeof(u32))) {
5438 found = 1;
5439 offset = 0;
5440 }
5441 return found ? offset : -1;
5442}
5443
5444
5445
5446/*
5447 * Function : void print_progress (Scsi_Cmnd *cmd)
5448 *
5449 * Purpose : print the current location of the saved data pointer
5450 *
5451 * Inputs : cmd - command we are interested in
5452 *
5453 */
5454
5455static void
5456print_progress (Scsi_Cmnd *cmd) {
5457 NCR53c7x0_local_declare();
5458 struct NCR53c7x0_cmd *ncmd =
5459 (struct NCR53c7x0_cmd *) cmd->host_scribble;
5460 int offset, i;
5461 char *where;
5462 u32 *ptr;
5463 NCR53c7x0_local_setup (cmd->device->host);
5464
5465 if (check_address ((unsigned long) ncmd,sizeof (struct NCR53c7x0_cmd)) == 0)
5466 {
5467 printk("\nNCR53c7x0_cmd fields:\n");
5468 printk(" bounce.len=0x%x, addr=0x%0x, buf[]=0x%02x %02x %02x %02x\n",
5469 ncmd->bounce.len, ncmd->bounce.addr, ncmd->bounce.buf[0],
5470 ncmd->bounce.buf[1], ncmd->bounce.buf[2], ncmd->bounce.buf[3]);
5471 printk(" result=%04x, cdb[0]=0x%02x\n", ncmd->result, ncmd->cmnd[0]);
5472 }
5473
5474 for (i = 0; i < 2; ++i) {
5475 if (check_address ((unsigned long) ncmd,
5476 sizeof (struct NCR53c7x0_cmd)) == -1)
5477 continue;
5478 if (!i) {
5479 where = "saved";
5480 ptr = bus_to_virt(ncmd->saved_data_pointer);
5481 } else {
5482 where = "active";
5483 ptr = bus_to_virt (NCR53c7x0_read32 (DSP_REG) -
5484 NCR53c7x0_insn_size (NCR53c7x0_read8 (DCMD_REG)) *
5485 sizeof(u32));
5486 }
5487 offset = insn_to_offset (cmd, ptr);
5488
5489 if (offset != -1)
5490 printk ("scsi%d : %s data pointer at offset %d\n",
5491 cmd->device->host->host_no, where, offset);
5492 else {
5493 int size;
5494 printk ("scsi%d : can't determine %s data pointer offset\n",
5495 cmd->device->host->host_no, where);
5496 if (ncmd) {
5497 size = print_insn (cmd->device->host,
5498 bus_to_virt(ncmd->saved_data_pointer), "", 1);
5499 print_insn (cmd->device->host,
5500 bus_to_virt(ncmd->saved_data_pointer) + size * sizeof(u32),
5501 "", 1);
5502 }
5503 }
5504 }
5505}
5506
5507
5508static void
5509print_dsa (struct Scsi_Host *host, u32 *dsa, const char *prefix) {
5510 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5511 host->hostdata[0];
5512 int i, len;
5513 char *ptr;
5514 Scsi_Cmnd *cmd;
5515
5516 if (check_address ((unsigned long) dsa, hostdata->dsa_end -
5517 hostdata->dsa_start) == -1) {
5518 printk("scsi%d : bad dsa virt 0x%p\n", host->host_no, dsa);
5519 return;
5520 }
5521 printk("%sscsi%d : dsa at phys 0x%lx (virt 0x%p)\n"
5522 " + %d : dsa_msgout length = %u, data = 0x%x (virt 0x%p)\n" ,
5523 prefix ? prefix : "",
5524 host->host_no, virt_to_bus (dsa), dsa, hostdata->dsa_msgout,
5525 dsa[hostdata->dsa_msgout / sizeof(u32)],
5526 dsa[hostdata->dsa_msgout / sizeof(u32) + 1],
5527 bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]));
5528
5529 /*
5530 * Only print messages if they're sane in length so we don't
5531 * blow the kernel printk buffer on something which won't buy us
5532 * anything.
5533 */
5534
5535 if (dsa[hostdata->dsa_msgout / sizeof(u32)] <
5536 sizeof (hostdata->free->select))
5537 for (i = dsa[hostdata->dsa_msgout / sizeof(u32)],
5538 ptr = bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]);
5539 i > 0 && !check_address ((unsigned long) ptr, 1);
5540 ptr += len, i -= len) {
5541 printk(" ");
5542 len = print_msg (ptr);
5543 printk("\n");
5544 if (!len)
5545 break;
5546 }
5547
5548 printk(" + %d : select_indirect = 0x%x\n",
5549 hostdata->dsa_select, dsa[hostdata->dsa_select / sizeof(u32)]);
5550 cmd = (Scsi_Cmnd *) bus_to_virt(dsa[hostdata->dsa_cmnd / sizeof(u32)]);
5551 printk(" + %d : dsa_cmnd = 0x%x ", hostdata->dsa_cmnd,
5552 (u32) virt_to_bus(cmd));
5553 /* XXX Maybe we should access cmd->host_scribble->result here. RGH */
5554 if (cmd) {
5555 printk(" result = 0x%x, target = %d, lun = %d, cmd = ",
5556 cmd->result, cmd->device->id, cmd->device->lun);
5557 print_command(cmd->cmnd);
5558 } else
5559 printk("\n");
5560 printk(" + %d : dsa_next = 0x%x\n", hostdata->dsa_next,
5561 dsa[hostdata->dsa_next / sizeof(u32)]);
5562 if (cmd) {
5563 printk("scsi%d target %d : sxfer_sanity = 0x%x, scntl3_sanity = 0x%x\n"
5564 " script : ",
5565 host->host_no, cmd->device->id,
5566 hostdata->sync[cmd->device->id].sxfer_sanity,
5567 hostdata->sync[cmd->device->id].scntl3_sanity);
5568 for (i = 0; i < (sizeof(hostdata->sync[cmd->device->id].script) / 4); ++i)
5569 printk ("0x%x ", hostdata->sync[cmd->device->id].script[i]);
5570 printk ("\n");
5571 print_progress (cmd);
5572 }
5573}
5574/*
5575 * Function : void print_queues (Scsi_Host *host)
5576 *
5577 * Purpose : print the contents of the NCR issue and reconnect queues
5578 *
5579 * Inputs : host - SCSI host we are interested in
5580 *
5581 */
5582
5583static void
5584print_queues (struct Scsi_Host *host) {
5585 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5586 host->hostdata[0];
5587 u32 *dsa, *next_dsa;
5588 volatile u32 *ncrcurrent;
5589 int left;
5590 Scsi_Cmnd *cmd, *next_cmd;
5591 unsigned long flags;
5592
5593 printk ("scsi%d : issue queue\n", host->host_no);
5594
5595 for (left = host->can_queue, cmd = (Scsi_Cmnd *) hostdata->issue_queue;
5596 left >= 0 && cmd;
5597 cmd = next_cmd) {
5598 next_cmd = (Scsi_Cmnd *) cmd->SCp.ptr;
5599 local_irq_save(flags);
5600 if (cmd->host_scribble) {
5601 if (check_address ((unsigned long) (cmd->host_scribble),
5602 sizeof (cmd->host_scribble)) == -1)
5603 printk ("scsi%d: scsi pid %ld bad pointer to NCR53c7x0_cmd\n",
5604 host->host_no, cmd->pid);
5605 /* print_dsa does sanity check on address, no need to check */
5606 else
5607 print_dsa (host, ((struct NCR53c7x0_cmd *) cmd->host_scribble)
5608 -> dsa, "");
5609 } else
5610 printk ("scsi%d : scsi pid %ld for target %d lun %d has no NCR53c7x0_cmd\n",
5611 host->host_no, cmd->pid, cmd->device->id, cmd->device->lun);
5612 local_irq_restore(flags);
5613 }
5614
5615 if (left <= 0) {
5616 printk ("scsi%d : loop detected in issue queue\n",
5617 host->host_no);
5618 }
5619
5620 /*
5621 * Traverse the NCR reconnect and start DSA structures, printing out
5622 * each element until we hit the end or detect a loop. Currently,
5623 * the reconnect structure is a linked list; and the start structure
5624 * is an array. Eventually, the reconnect structure will become a
5625 * list as well, since this simplifies the code.
5626 */
5627
5628 printk ("scsi%d : schedule dsa array :\n", host->host_no);
5629 for (left = host->can_queue, ncrcurrent = hostdata->schedule;
5630 left > 0; ncrcurrent += 2, --left)
5631 if (ncrcurrent[0] != hostdata->NOP_insn)
5632/* FIXME : convert pointer to dsa_begin to pointer to dsa. */
5633 print_dsa (host, bus_to_virt (ncrcurrent[1] -
5634 (hostdata->E_dsa_code_begin -
5635 hostdata->E_dsa_code_template)), "");
5636 printk ("scsi%d : end schedule dsa array\n", host->host_no);
5637
5638 printk ("scsi%d : reconnect_dsa_head :\n", host->host_no);
5639
5640 for (left = host->can_queue,
5641 dsa = bus_to_virt (hostdata->reconnect_dsa_head);
5642 left >= 0 && dsa;
5643 dsa = next_dsa) {
5644 local_irq_save(flags);
5645 if (check_address ((unsigned long) dsa, sizeof(dsa)) == -1) {
5646 printk ("scsi%d: bad DSA pointer 0x%p", host->host_no,
5647 dsa);
5648 next_dsa = NULL;
5649 }
5650 else
5651 {
5652 next_dsa = bus_to_virt(dsa[hostdata->dsa_next / sizeof(u32)]);
5653 print_dsa (host, dsa, "");
5654 }
5655 local_irq_restore(flags);
5656 }
5657 printk ("scsi%d : end reconnect_dsa_head\n", host->host_no);
5658 if (left < 0)
5659 printk("scsi%d: possible loop in ncr reconnect list\n",
5660 host->host_no);
5661}
5662
5663static void
5664print_lots (struct Scsi_Host *host) {
5665 NCR53c7x0_local_declare();
5666 struct NCR53c7x0_hostdata *hostdata =
5667 (struct NCR53c7x0_hostdata *) host->hostdata[0];
5668 u32 *dsp_next, *dsp, *dsa, dbc_dcmd;
5669 unsigned char dcmd, sbcl;
5670 int i, size;
5671 NCR53c7x0_local_setup(host);
5672
5673 if ((dsp_next = bus_to_virt(NCR53c7x0_read32 (DSP_REG)))) {
5674 dbc_dcmd = NCR53c7x0_read32(DBC_REG);
5675 dcmd = (dbc_dcmd & 0xff000000) >> 24;
5676 dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
5677 dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
5678 sbcl = NCR53c7x0_read8 (SBCL_REG);
5679
5680 /*
5681 * For the 53c710, the following will report value 0 for SCNTL3
5682 * and STEST0 - we don't have these registers.
5683 */
5684 printk ("scsi%d : DCMD|DBC=0x%x, DNAD=0x%x (virt 0x%p)\n"
5685 " DSA=0x%lx (virt 0x%p)\n"
5686 " DSPS=0x%x, TEMP=0x%x (virt 0x%p), DMODE=0x%x\n"
5687 " SXFER=0x%x, SCNTL3=0x%x\n"
5688 " %s%s%sphase=%s, %d bytes in SCSI FIFO\n"
5689 " SCRATCH=0x%x, saved2_dsa=0x%0lx\n",
5690 host->host_no, dbc_dcmd, NCR53c7x0_read32(DNAD_REG),
5691 bus_to_virt(NCR53c7x0_read32(DNAD_REG)),
5692 virt_to_bus(dsa), dsa,
5693 NCR53c7x0_read32(DSPS_REG), NCR53c7x0_read32(TEMP_REG),
5694 bus_to_virt (NCR53c7x0_read32(TEMP_REG)),
5695 (int) NCR53c7x0_read8(hostdata->dmode),
5696 (int) NCR53c7x0_read8(SXFER_REG),
5697 ((hostdata->chip / 100) == 8) ?
5698 (int) NCR53c7x0_read8(SCNTL3_REG_800) : 0,
5699 (sbcl & SBCL_BSY) ? "BSY " : "",
5700 (sbcl & SBCL_SEL) ? "SEL " : "",
5701 (sbcl & SBCL_REQ) ? "REQ " : "",
5702 sstat2_to_phase(NCR53c7x0_read8 (((hostdata->chip / 100) == 8) ?
5703 SSTAT1_REG : SSTAT2_REG)),
5704 (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ?
5705 SSTAT1_REG : SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT,
5706 ((hostdata->chip / 100) == 8) ? NCR53c7x0_read8 (STEST0_REG_800) :
5707 NCR53c7x0_read32(SCRATCHA_REG_800),
5708 hostdata->saved2_dsa);
5709 printk ("scsi%d : DSP 0x%lx (virt 0x%p) ->\n", host->host_no,
5710 virt_to_bus(dsp), dsp);
5711 for (i = 6; i > 0; --i, dsp += size)
5712 size = print_insn (host, dsp, "", 1);
5713 if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
5714 if ((hostdata->chip / 100) == 8)
5715 printk ("scsi%d : connected (SDID=0x%x, SSID=0x%x)\n",
5716 host->host_no, NCR53c7x0_read8 (SDID_REG_800),
5717 NCR53c7x0_read8 (SSID_REG_800));
5718 else
5719 printk ("scsi%d : connected (SDID=0x%x)\n",
5720 host->host_no, NCR53c7x0_read8 (SDID_REG_700));
5721 print_dsa (host, dsa, "");
5722 }
5723
5724#if 1
5725 print_queues (host);
5726#endif
5727 }
5728}
5729
5730/*
5731 * Function : static int shutdown (struct Scsi_Host *host)
5732 *
5733 * Purpose : does a clean (we hope) shutdown of the NCR SCSI
5734 * chip. Use prior to dumping core, unloading the NCR driver,
5735 *
5736 * Returns : 0 on success
5737 */
5738static int
5739shutdown (struct Scsi_Host *host) {
5740 NCR53c7x0_local_declare();
5741 unsigned long flags;
5742 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5743 host->hostdata[0];
5744 NCR53c7x0_local_setup(host);
5745 local_irq_save(flags);
5746/* Get in a state where we can reset the SCSI bus */
5747 ncr_halt (host);
5748 ncr_scsi_reset (host);
5749 hostdata->soft_reset(host);
5750
5751 disable (host);
5752 local_irq_restore(flags);
5753 return 0;
5754}
5755
5756/*
5757 * Function : void ncr_scsi_reset (struct Scsi_Host *host)
5758 *
5759 * Purpose : reset the SCSI bus.
5760 */
5761
5762static void
5763ncr_scsi_reset (struct Scsi_Host *host) {
5764 NCR53c7x0_local_declare();
5765 unsigned long flags;
5766 NCR53c7x0_local_setup(host);
5767 local_irq_save(flags);
5768 NCR53c7x0_write8(SCNTL1_REG, SCNTL1_RST);
5769 udelay(25); /* Minimum amount of time to assert RST */
5770 NCR53c7x0_write8(SCNTL1_REG, 0);
5771 local_irq_restore(flags);
5772}
5773
5774/*
5775 * Function : void hard_reset (struct Scsi_Host *host)
5776 *
5777 */
5778
5779static void
5780hard_reset (struct Scsi_Host *host) {
5781 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5782 host->hostdata[0];
5783 unsigned long flags;
5784 local_irq_save(flags);
5785 ncr_scsi_reset(host);
5786 NCR53c7x0_driver_init (host);
5787 if (hostdata->soft_reset)
5788 hostdata->soft_reset (host);
5789 local_irq_restore(flags);
5790}
5791
5792
5793/*
5794 * Function : Scsi_Cmnd *return_outstanding_commands (struct Scsi_Host *host,
5795 * int free, int issue)
5796 *
5797 * Purpose : return a linked list (using the SCp.buffer field as next,
5798 * so we don't perturb hostdata. We don't use a field of the
5799 * NCR53c7x0_cmd structure since we may not have allocated one
5800 * for the command causing the reset.) of Scsi_Cmnd structures that
5801 * had propagated below the Linux issue queue level. If free is set,
5802 * free the NCR53c7x0_cmd structures which are associated with
5803 * the Scsi_Cmnd structures, and clean up any internal
5804 * NCR lists that the commands were on. If issue is set,
5805 * also return commands in the issue queue.
5806 *
5807 * Returns : linked list of commands
5808 *
5809 * NOTE : the caller should insure that the NCR chip is halted
5810 * if the free flag is set.
5811 */
5812
5813static Scsi_Cmnd *
5814return_outstanding_commands (struct Scsi_Host *host, int free, int issue) {
5815 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5816 host->hostdata[0];
5817 struct NCR53c7x0_cmd *c;
5818 int i;
5819 u32 *ncrcurrent;
5820 Scsi_Cmnd *list = NULL, *tmp;
5821 for (c = (struct NCR53c7x0_cmd *) hostdata->running_list; c;
5822 c = (struct NCR53c7x0_cmd *) c->next) {
5823 if (c->cmd->SCp.buffer) {
5824 printk ("scsi%d : loop detected in running list!\n", host->host_no);
5825 break;
5826 } else {
5827 printk ("Duh? Bad things happening in the NCR driver\n");
5828 break;
5829 }
5830
5831 c->cmd->SCp.buffer = (struct scatterlist *) list;
5832 list = c->cmd;
5833 if (free) {
5834 c->next = hostdata->free;
5835 hostdata->free = c;
5836 }
5837 }
5838
5839 if (free) {
5840 for (i = 0, ncrcurrent = (u32 *) hostdata->schedule;
5841 i < host->can_queue; ++i, ncrcurrent += 2) {
5842 ncrcurrent[0] = hostdata->NOP_insn;
5843 ncrcurrent[1] = 0xdeadbeef;
5844 }
5845 hostdata->ncrcurrent = NULL;
5846 }
5847
5848 if (issue) {
5849 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; tmp = tmp->next) {
5850 if (tmp->SCp.buffer) {
5851 printk ("scsi%d : loop detected in issue queue!\n",
5852 host->host_no);
5853 break;
5854 }
5855 tmp->SCp.buffer = (struct scatterlist *) list;
5856 list = tmp;
5857 }
5858 if (free)
5859 hostdata->issue_queue = NULL;
5860
5861 }
5862 return list;
5863}
5864
5865/*
5866 * Function : static int disable (struct Scsi_Host *host)
5867 *
5868 * Purpose : disables the given NCR host, causing all commands
5869 * to return a driver error. Call this so we can unload the
5870 * module during development and try again. Eventually,
5871 * we should be able to find clean workarounds for these
5872 * problems.
5873 *
5874 * Inputs : host - hostadapter to twiddle
5875 *
5876 * Returns : 0 on success.
5877 */
5878
5879static int
5880disable (struct Scsi_Host *host) {
5881 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5882 host->hostdata[0];
5883 unsigned long flags;
5884 Scsi_Cmnd *nuke_list, *tmp;
5885 local_irq_save(flags);
5886 if (hostdata->state != STATE_HALTED)
5887 ncr_halt (host);
5888 nuke_list = return_outstanding_commands (host, 1 /* free */, 1 /* issue */);
5889 hard_reset (host);
5890 hostdata->state = STATE_DISABLED;
5891 local_irq_restore(flags);
5892 printk ("scsi%d : nuking commands\n", host->host_no);
5893 for (; nuke_list; nuke_list = tmp) {
5894 tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
5895 nuke_list->result = DID_ERROR << 16;
5896 nuke_list->scsi_done(nuke_list);
5897 }
5898 printk ("scsi%d : done. \n", host->host_no);
5899 printk (KERN_ALERT "scsi%d : disabled. Unload and reload\n",
5900 host->host_no);
5901 return 0;
5902}
5903
5904/*
5905 * Function : static int ncr_halt (struct Scsi_Host *host)
5906 *
5907 * Purpose : halts the SCSI SCRIPTS(tm) processor on the NCR chip
5908 *
5909 * Inputs : host - SCSI chip to halt
5910 *
5911 * Returns : 0 on success
5912 */
5913
5914static int
5915ncr_halt (struct Scsi_Host *host) {
5916 NCR53c7x0_local_declare();
5917 unsigned long flags;
5918 unsigned char istat, tmp;
5919 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5920 host->hostdata[0];
5921 int stage;
5922 NCR53c7x0_local_setup(host);
5923
5924 local_irq_save(flags);
5925 /* Stage 0 : eat all interrupts
5926 Stage 1 : set ABORT
5927 Stage 2 : eat all but abort interrupts
5928 Stage 3 : eat all interrupts
5929 */
5930 for (stage = 0;;) {
5931 if (stage == 1) {
5932 NCR53c7x0_write8(hostdata->istat, ISTAT_ABRT);
5933 ++stage;
5934 }
5935 istat = NCR53c7x0_read8 (hostdata->istat);
5936 if (istat & ISTAT_SIP) {
5937 tmp = NCR53c7x0_read8(SSTAT0_REG);
5938 } else if (istat & ISTAT_DIP) {
5939 tmp = NCR53c7x0_read8(DSTAT_REG);
5940 if (stage == 2) {
5941 if (tmp & DSTAT_ABRT) {
5942 NCR53c7x0_write8(hostdata->istat, 0);
5943 ++stage;
5944 } else {
5945 printk(KERN_ALERT "scsi%d : could not halt NCR chip\n",
5946 host->host_no);
5947 disable (host);
5948 }
5949 }
5950 }
5951 if (!(istat & (ISTAT_SIP|ISTAT_DIP))) {
5952 if (stage == 0)
5953 ++stage;
5954 else if (stage == 3)
5955 break;
5956 }
5957 }
5958 hostdata->state = STATE_HALTED;
5959 local_irq_restore(flags);
5960#if 0
5961 print_lots (host);
5962#endif
5963 return 0;
5964}
5965
5966/*
5967 * Function: event_name (int event)
5968 *
5969 * Purpose: map event enum into user-readable strings.
5970 */
5971
5972static const char *
5973event_name (int event) {
5974 switch (event) {
5975 case EVENT_NONE: return "none";
5976 case EVENT_ISSUE_QUEUE: return "to issue queue";
5977 case EVENT_START_QUEUE: return "to start queue";
5978 case EVENT_SELECT: return "selected";
5979 case EVENT_DISCONNECT: return "disconnected";
5980 case EVENT_RESELECT: return "reselected";
5981 case EVENT_COMPLETE: return "completed";
5982 case EVENT_IDLE: return "idle";
5983 case EVENT_SELECT_FAILED: return "select failed";
5984 case EVENT_BEFORE_SELECT: return "before select";
5985 case EVENT_RESELECT_FAILED: return "reselect failed";
5986 default: return "unknown";
5987 }
5988}
5989
5990/*
5991 * Function : void dump_events (struct Scsi_Host *host, count)
5992 *
5993 * Purpose : print last count events which have occurred.
5994 */
5995static void
5996dump_events (struct Scsi_Host *host, int count) {
5997 struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
5998 host->hostdata[0];
5999 struct NCR53c7x0_event event;
6000 int i;
6001 unsigned long flags;
6002 if (hostdata->events) {
6003 if (count > hostdata->event_size)
6004 count = hostdata->event_size;
6005 for (i = hostdata->event_index; count > 0;
6006 i = (i ? i - 1 : hostdata->event_size -1), --count) {
6007/*
6008 * By copying the event we're currently examining with interrupts
6009 * disabled, we can do multiple printk(), etc. operations and
6010 * still be guaranteed that they're happening on the same
6011 * event structure.
6012 */
6013 local_irq_save(flags);
6014#if 0
6015 event = hostdata->events[i];
6016#else
6017 memcpy ((void *) &event, (void *) &(hostdata->events[i]),
6018 sizeof(event));
6019#endif
6020
6021 local_irq_restore(flags);
6022 printk ("scsi%d : %s event %d at %ld secs %ld usecs target %d lun %d\n",
6023 host->host_no, event_name (event.event), count,
6024 (long) event.time.tv_sec, (long) event.time.tv_usec,
6025 event.target, event.lun);
6026 if (event.dsa)
6027 printk (" event for dsa 0x%lx (virt 0x%p)\n",
6028 virt_to_bus(event.dsa), event.dsa);
6029 if (event.pid != -1) {
6030 printk (" event for pid %ld ", event.pid);
6031 print_command (event.cmnd);
6032 }
6033 }
6034 }
6035}
6036
6037/*
6038 * Function: check_address
6039 *
6040 * Purpose: Check to see if a possibly corrupt pointer will fault the
6041 * kernel.
6042 *
6043 * Inputs: addr - address; size - size of area
6044 *
6045 * Returns: 0 if area is OK, -1 on error.
6046 *
6047 * NOTES: should be implemented in terms of vverify on kernels
6048 * that have it.
6049 */
6050
6051static int
6052check_address (unsigned long addr, int size) {
6053 return (virt_to_phys((void *)addr) < PAGE_SIZE || virt_to_phys((void *)(addr + size)) > virt_to_phys(high_memory) ? -1 : 0);
6054}
6055
6056#ifdef MODULE
6057int
6058NCR53c7x0_release(struct Scsi_Host *host) {
6059 struct NCR53c7x0_hostdata *hostdata =
6060 (struct NCR53c7x0_hostdata *) host->hostdata[0];
6061 struct NCR53c7x0_cmd *cmd, *tmp;
6062 shutdown (host);
6063 if (host->irq != SCSI_IRQ_NONE)
6064 {
6065 int irq_count;
6066 struct Scsi_Host *tmp;
6067 for (irq_count = 0, tmp = first_host; tmp; tmp = tmp->next)
6068 if (tmp->hostt == the_template && tmp->irq == host->irq)
6069 ++irq_count;
6070 if (irq_count == 1)
6071 free_irq(host->irq, NULL);
6072 }
6073 if (host->dma_channel != DMA_NONE)
6074 free_dma(host->dma_channel);
6075 if (host->io_port)
6076 release_region(host->io_port, host->n_io_port);
6077
6078 for (cmd = (struct NCR53c7x0_cmd *) hostdata->free; cmd; cmd = tmp,
6079 --hostdata->num_cmds) {
6080 tmp = (struct NCR53c7x0_cmd *) cmd->next;
6081 /*
6082 * If we're going to loop, try to stop it to get a more accurate
6083 * count of the leaked commands.
6084 */
6085 cmd->next = NULL;
6086 if (cmd->free)
6087 cmd->free ((void *) cmd->real, cmd->size);
6088 }
6089 if (hostdata->num_cmds)
6090 printk ("scsi%d : leaked %d NCR53c7x0_cmd structures\n",
6091 host->host_no, hostdata->num_cmds);
6092 if (hostdata->events)
6093 vfree ((void *)hostdata->events);
6094
6095 /* XXX This assumes default cache mode to be IOMAP_FULL_CACHING, which
6096 * XXX may be invalid (CONFIG_060_WRITETHROUGH)
6097 */
6098 kernel_set_cachemode((void *)hostdata, 8192, IOMAP_FULL_CACHING);
6099 free_pages ((u32)hostdata, 1);
6100 return 1;
6101}
6102#endif /* def MODULE */
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