diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/atari_NCR5380.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!
Diffstat (limited to 'drivers/scsi/atari_NCR5380.c')
-rw-r--r-- | drivers/scsi/atari_NCR5380.c | 2986 |
1 files changed, 2986 insertions, 0 deletions
diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c new file mode 100644 index 000000000000..5d1e78ebed83 --- /dev/null +++ b/drivers/scsi/atari_NCR5380.c | |||
@@ -0,0 +1,2986 @@ | |||
1 | /* | ||
2 | * NCR 5380 generic driver routines. These should make it *trivial* | ||
3 | * to implement 5380 SCSI drivers under Linux with a non-trantor | ||
4 | * architecture. | ||
5 | * | ||
6 | * Note that these routines also work with NR53c400 family chips. | ||
7 | * | ||
8 | * Copyright 1993, Drew Eckhardt | ||
9 | * Visionary Computing | ||
10 | * (Unix and Linux consulting and custom programming) | ||
11 | * drew@colorado.edu | ||
12 | * +1 (303) 666-5836 | ||
13 | * | ||
14 | * DISTRIBUTION RELEASE 6. | ||
15 | * | ||
16 | * For more information, please consult | ||
17 | * | ||
18 | * NCR 5380 Family | ||
19 | * SCSI Protocol Controller | ||
20 | * Databook | ||
21 | * | ||
22 | * NCR Microelectronics | ||
23 | * 1635 Aeroplaza Drive | ||
24 | * Colorado Springs, CO 80916 | ||
25 | * 1+ (719) 578-3400 | ||
26 | * 1+ (800) 334-5454 | ||
27 | */ | ||
28 | |||
29 | /* | ||
30 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | ||
31 | * this file, too: | ||
32 | * | ||
33 | * - Some of the debug statements were incorrect (undefined variables and the | ||
34 | * like). I fixed that. | ||
35 | * | ||
36 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | ||
37 | * possible DMA transfer size should also happen for REAL_DMA. I added this | ||
38 | * in the #if statement. | ||
39 | * | ||
40 | * - When using real DMA, information_transfer() should return in a DATAOUT | ||
41 | * phase after starting the DMA. It has nothing more to do. | ||
42 | * | ||
43 | * - The interrupt service routine should run main after end of DMA, too (not | ||
44 | * only after RESELECTION interrupts). Additionally, it should _not_ test | ||
45 | * for more interrupts after running main, since a DMA process may have | ||
46 | * been started and interrupts are turned on now. The new int could happen | ||
47 | * inside the execution of NCR5380_intr(), leading to recursive | ||
48 | * calls. | ||
49 | * | ||
50 | * - I've added a function merge_contiguous_buffers() that tries to | ||
51 | * merge scatter-gather buffers that are located at contiguous | ||
52 | * physical addresses and can be processed with the same DMA setup. | ||
53 | * Since most scatter-gather operations work on a page (4K) of | ||
54 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | ||
55 | * DMA setup actions are saved. | ||
56 | * | ||
57 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | ||
58 | * and USLEEP, because these were messing up readability and will never be | ||
59 | * needed for Atari SCSI. | ||
60 | * | ||
61 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' | ||
62 | * stuff), and 'main' is executed in a bottom half if awoken by an | ||
63 | * interrupt. | ||
64 | * | ||
65 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | ||
66 | * constructs. In my eyes, this made the source rather unreadable, so I | ||
67 | * finally replaced that by the *_PRINTK() macros. | ||
68 | * | ||
69 | */ | ||
70 | |||
71 | /* | ||
72 | * Further development / testing that should be done : | ||
73 | * 1. Test linked command handling code after Eric is ready with | ||
74 | * the high level code. | ||
75 | */ | ||
76 | |||
77 | #if (NDEBUG & NDEBUG_LISTS) | ||
78 | #define LIST(x,y) \ | ||
79 | { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \ | ||
80 | if ((x)==(y)) udelay(5); } | ||
81 | #define REMOVE(w,x,y,z) \ | ||
82 | { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \ | ||
83 | (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \ | ||
84 | if ((x)==(y)) udelay(5); } | ||
85 | #else | ||
86 | #define LIST(x,y) | ||
87 | #define REMOVE(w,x,y,z) | ||
88 | #endif | ||
89 | |||
90 | #ifndef notyet | ||
91 | #undef LINKED | ||
92 | #endif | ||
93 | |||
94 | /* | ||
95 | * Design | ||
96 | * Issues : | ||
97 | * | ||
98 | * The other Linux SCSI drivers were written when Linux was Intel PC-only, | ||
99 | * and specifically for each board rather than each chip. This makes their | ||
100 | * adaptation to platforms like the Mac (Some of which use NCR5380's) | ||
101 | * more difficult than it has to be. | ||
102 | * | ||
103 | * Also, many of the SCSI drivers were written before the command queuing | ||
104 | * routines were implemented, meaning their implementations of queued | ||
105 | * commands were hacked on rather than designed in from the start. | ||
106 | * | ||
107 | * When I designed the Linux SCSI drivers I figured that | ||
108 | * while having two different SCSI boards in a system might be useful | ||
109 | * for debugging things, two of the same type wouldn't be used. | ||
110 | * Well, I was wrong and a number of users have mailed me about running | ||
111 | * multiple high-performance SCSI boards in a server. | ||
112 | * | ||
113 | * Finally, when I get questions from users, I have no idea what | ||
114 | * revision of my driver they are running. | ||
115 | * | ||
116 | * This driver attempts to address these problems : | ||
117 | * This is a generic 5380 driver. To use it on a different platform, | ||
118 | * one simply writes appropriate system specific macros (ie, data | ||
119 | * transfer - some PC's will use the I/O bus, 68K's must use | ||
120 | * memory mapped) and drops this file in their 'C' wrapper. | ||
121 | * | ||
122 | * As far as command queueing, two queues are maintained for | ||
123 | * each 5380 in the system - commands that haven't been issued yet, | ||
124 | * and commands that are currently executing. This means that an | ||
125 | * unlimited number of commands may be queued, letting | ||
126 | * more commands propagate from the higher driver levels giving higher | ||
127 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | ||
128 | * allowing multiple commands to propagate all the way to a SCSI-II device | ||
129 | * while a command is already executing. | ||
130 | * | ||
131 | * To solve the multiple-boards-in-the-same-system problem, | ||
132 | * there is a separate instance structure for each instance | ||
133 | * of a 5380 in the system. So, multiple NCR5380 drivers will | ||
134 | * be able to coexist with appropriate changes to the high level | ||
135 | * SCSI code. | ||
136 | * | ||
137 | * A NCR5380_PUBLIC_REVISION macro is provided, with the release | ||
138 | * number (updated for each public release) printed by the | ||
139 | * NCR5380_print_options command, which should be called from the | ||
140 | * wrapper detect function, so that I know what release of the driver | ||
141 | * users are using. | ||
142 | * | ||
143 | * Issues specific to the NCR5380 : | ||
144 | * | ||
145 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | ||
146 | * piece of hardware that requires you to sit in a loop polling for | ||
147 | * the REQ signal as long as you are connected. Some devices are | ||
148 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | ||
149 | * while doing long seek operations. | ||
150 | * | ||
151 | * The workaround for this is to keep track of devices that have | ||
152 | * disconnected. If the device hasn't disconnected, for commands that | ||
153 | * should disconnect, we do something like | ||
154 | * | ||
155 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | ||
156 | * | ||
157 | * Some tweaking of N and M needs to be done. An algorithm based | ||
158 | * on "time to data" would give the best results as long as short time | ||
159 | * to datas (ie, on the same track) were considered, however these | ||
160 | * broken devices are the exception rather than the rule and I'd rather | ||
161 | * spend my time optimizing for the normal case. | ||
162 | * | ||
163 | * Architecture : | ||
164 | * | ||
165 | * At the heart of the design is a coroutine, NCR5380_main, | ||
166 | * which is started when not running by the interrupt handler, | ||
167 | * timer, and queue command function. It attempts to establish | ||
168 | * I_T_L or I_T_L_Q nexuses by removing the commands from the | ||
169 | * issue queue and calling NCR5380_select() if a nexus | ||
170 | * is not established. | ||
171 | * | ||
172 | * Once a nexus is established, the NCR5380_information_transfer() | ||
173 | * phase goes through the various phases as instructed by the target. | ||
174 | * if the target goes into MSG IN and sends a DISCONNECT message, | ||
175 | * the command structure is placed into the per instance disconnected | ||
176 | * queue, and NCR5380_main tries to find more work. If USLEEP | ||
177 | * was defined, and the target is idle for too long, the system | ||
178 | * will try to sleep. | ||
179 | * | ||
180 | * If a command has disconnected, eventually an interrupt will trigger, | ||
181 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | ||
182 | * to reestablish a nexus. This will run main if necessary. | ||
183 | * | ||
184 | * On command termination, the done function will be called as | ||
185 | * appropriate. | ||
186 | * | ||
187 | * SCSI pointers are maintained in the SCp field of SCSI command | ||
188 | * structures, being initialized after the command is connected | ||
189 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | ||
190 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | ||
191 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | ||
192 | */ | ||
193 | |||
194 | /* | ||
195 | * Using this file : | ||
196 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | ||
197 | * of chips. To use it, you write an architecture specific functions | ||
198 | * and macros and include this file in your driver. | ||
199 | * | ||
200 | * These macros control options : | ||
201 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | ||
202 | * for commands that return with a CHECK CONDITION status. | ||
203 | * | ||
204 | * LINKED - if defined, linked commands are supported. | ||
205 | * | ||
206 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | ||
207 | * | ||
208 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | ||
209 | * | ||
210 | * These macros MUST be defined : | ||
211 | * | ||
212 | * NCR5380_read(register) - read from the specified register | ||
213 | * | ||
214 | * NCR5380_write(register, value) - write to the specific register | ||
215 | * | ||
216 | * Either real DMA *or* pseudo DMA may be implemented | ||
217 | * REAL functions : | ||
218 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | ||
219 | * Note that the DMA setup functions should return the number of bytes | ||
220 | * that they were able to program the controller for. | ||
221 | * | ||
222 | * Also note that generic i386/PC versions of these macros are | ||
223 | * available as NCR5380_i386_dma_write_setup, | ||
224 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | ||
225 | * | ||
226 | * NCR5380_dma_write_setup(instance, src, count) - initialize | ||
227 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | ||
228 | * NCR5380_dma_residual(instance); - residual count | ||
229 | * | ||
230 | * PSEUDO functions : | ||
231 | * NCR5380_pwrite(instance, src, count) | ||
232 | * NCR5380_pread(instance, dst, count); | ||
233 | * | ||
234 | * If nothing specific to this implementation needs doing (ie, with external | ||
235 | * hardware), you must also define | ||
236 | * | ||
237 | * NCR5380_queue_command | ||
238 | * NCR5380_reset | ||
239 | * NCR5380_abort | ||
240 | * NCR5380_proc_info | ||
241 | * | ||
242 | * to be the global entry points into the specific driver, ie | ||
243 | * #define NCR5380_queue_command t128_queue_command. | ||
244 | * | ||
245 | * If this is not done, the routines will be defined as static functions | ||
246 | * with the NCR5380* names and the user must provide a globally | ||
247 | * accessible wrapper function. | ||
248 | * | ||
249 | * The generic driver is initialized by calling NCR5380_init(instance), | ||
250 | * after setting the appropriate host specific fields and ID. If the | ||
251 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | ||
252 | * possible) function may be used. Before the specific driver initialization | ||
253 | * code finishes, NCR5380_print_options should be called. | ||
254 | */ | ||
255 | |||
256 | static struct Scsi_Host *first_instance = NULL; | ||
257 | static Scsi_Host_Template *the_template = NULL; | ||
258 | |||
259 | /* Macros ease life... :-) */ | ||
260 | #define SETUP_HOSTDATA(in) \ | ||
261 | struct NCR5380_hostdata *hostdata = \ | ||
262 | (struct NCR5380_hostdata *)(in)->hostdata | ||
263 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | ||
264 | |||
265 | #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble)) | ||
266 | #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble)) | ||
267 | |||
268 | #define HOSTNO instance->host_no | ||
269 | #define H_NO(cmd) (cmd)->device->host->host_no | ||
270 | |||
271 | #ifdef SUPPORT_TAGS | ||
272 | |||
273 | /* | ||
274 | * Functions for handling tagged queuing | ||
275 | * ===================================== | ||
276 | * | ||
277 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | ||
278 | * | ||
279 | * Using consecutive numbers for the tags is no good idea in my eyes. There | ||
280 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | ||
281 | * command has been preempted for a long time. My solution: a bitfield for | ||
282 | * remembering used tags. | ||
283 | * | ||
284 | * There's also the problem that each target has a certain queue size, but we | ||
285 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | ||
286 | * returned. So, in this case, the driver internal queue size assumption is | ||
287 | * reduced to the number of active tags if QUEUE_FULL is returned by the | ||
288 | * target. The command is returned to the mid-level, but with status changed | ||
289 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL | ||
290 | * correctly. | ||
291 | * | ||
292 | * We're also not allowed running tagged commands as long as an untagged | ||
293 | * command is active. And REQUEST SENSE commands after a contingent allegiance | ||
294 | * condition _must_ be untagged. To keep track whether an untagged command has | ||
295 | * been issued, the host->busy array is still employed, as it is without | ||
296 | * support for tagged queuing. | ||
297 | * | ||
298 | * One could suspect that there are possible race conditions between | ||
299 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | ||
300 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | ||
301 | * which already guaranteed to be running at most once. It is also the only | ||
302 | * place where tags/LUNs are allocated. So no other allocation can slip | ||
303 | * between that pair, there could only happen a reselection, which can free a | ||
304 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | ||
305 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | ||
306 | */ | ||
307 | |||
308 | /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ | ||
309 | #undef TAG_NONE | ||
310 | #define TAG_NONE 0xff | ||
311 | |||
312 | typedef struct { | ||
313 | DECLARE_BITMAP(allocated, MAX_TAGS); | ||
314 | int nr_allocated; | ||
315 | int queue_size; | ||
316 | } TAG_ALLOC; | ||
317 | |||
318 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ | ||
319 | |||
320 | |||
321 | static void __init init_tags( void ) | ||
322 | { | ||
323 | int target, lun; | ||
324 | TAG_ALLOC *ta; | ||
325 | |||
326 | if (!setup_use_tagged_queuing) | ||
327 | return; | ||
328 | |||
329 | for( target = 0; target < 8; ++target ) { | ||
330 | for( lun = 0; lun < 8; ++lun ) { | ||
331 | ta = &TagAlloc[target][lun]; | ||
332 | bitmap_zero(ta->allocated, MAX_TAGS); | ||
333 | ta->nr_allocated = 0; | ||
334 | /* At the beginning, assume the maximum queue size we could | ||
335 | * support (MAX_TAGS). This value will be decreased if the target | ||
336 | * returns QUEUE_FULL status. | ||
337 | */ | ||
338 | ta->queue_size = MAX_TAGS; | ||
339 | } | ||
340 | } | ||
341 | } | ||
342 | |||
343 | |||
344 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | ||
345 | * busy by an untagged command. If the command should use tagged queuing, also | ||
346 | * check that there is a free tag and the target's queue won't overflow. This | ||
347 | * function should be called with interrupts disabled to avoid race | ||
348 | * conditions. | ||
349 | */ | ||
350 | |||
351 | static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged ) | ||
352 | { | ||
353 | SETUP_HOSTDATA(cmd->device->host); | ||
354 | |||
355 | if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) | ||
356 | return( 1 ); | ||
357 | if (!should_be_tagged || | ||
358 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) | ||
359 | return( 0 ); | ||
360 | if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= | ||
361 | TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) { | ||
362 | TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n", | ||
363 | H_NO(cmd), cmd->device->id, cmd->device->lun ); | ||
364 | return( 1 ); | ||
365 | } | ||
366 | return( 0 ); | ||
367 | } | ||
368 | |||
369 | |||
370 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | ||
371 | * must be called before!), or reserve the LUN in 'busy' if the command is | ||
372 | * untagged. | ||
373 | */ | ||
374 | |||
375 | static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged ) | ||
376 | { | ||
377 | SETUP_HOSTDATA(cmd->device->host); | ||
378 | |||
379 | /* If we or the target don't support tagged queuing, allocate the LUN for | ||
380 | * an untagged command. | ||
381 | */ | ||
382 | if (!should_be_tagged || | ||
383 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) { | ||
384 | cmd->tag = TAG_NONE; | ||
385 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | ||
386 | TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged " | ||
387 | "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); | ||
388 | } | ||
389 | else { | ||
390 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | ||
391 | |||
392 | cmd->tag = find_first_zero_bit( ta->allocated, MAX_TAGS ); | ||
393 | set_bit( cmd->tag, ta->allocated ); | ||
394 | ta->nr_allocated++; | ||
395 | TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d " | ||
396 | "(now %d tags in use)\n", | ||
397 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun, | ||
398 | ta->nr_allocated ); | ||
399 | } | ||
400 | } | ||
401 | |||
402 | |||
403 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | ||
404 | * unlock the LUN. | ||
405 | */ | ||
406 | |||
407 | static void cmd_free_tag( Scsi_Cmnd *cmd ) | ||
408 | { | ||
409 | SETUP_HOSTDATA(cmd->device->host); | ||
410 | |||
411 | if (cmd->tag == TAG_NONE) { | ||
412 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | ||
413 | TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n", | ||
414 | H_NO(cmd), cmd->device->id, cmd->device->lun ); | ||
415 | } | ||
416 | else if (cmd->tag >= MAX_TAGS) { | ||
417 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | ||
418 | H_NO(cmd), cmd->tag ); | ||
419 | } | ||
420 | else { | ||
421 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | ||
422 | clear_bit( cmd->tag, ta->allocated ); | ||
423 | ta->nr_allocated--; | ||
424 | TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n", | ||
425 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun ); | ||
426 | } | ||
427 | } | ||
428 | |||
429 | |||
430 | static void free_all_tags( void ) | ||
431 | { | ||
432 | int target, lun; | ||
433 | TAG_ALLOC *ta; | ||
434 | |||
435 | if (!setup_use_tagged_queuing) | ||
436 | return; | ||
437 | |||
438 | for( target = 0; target < 8; ++target ) { | ||
439 | for( lun = 0; lun < 8; ++lun ) { | ||
440 | ta = &TagAlloc[target][lun]; | ||
441 | bitmap_zero(ta->allocated, MAX_TAGS); | ||
442 | ta->nr_allocated = 0; | ||
443 | } | ||
444 | } | ||
445 | } | ||
446 | |||
447 | #endif /* SUPPORT_TAGS */ | ||
448 | |||
449 | |||
450 | /* | ||
451 | * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) | ||
452 | * | ||
453 | * Purpose: Try to merge several scatter-gather requests into one DMA | ||
454 | * transfer. This is possible if the scatter buffers lie on | ||
455 | * physical contiguous addresses. | ||
456 | * | ||
457 | * Parameters: Scsi_Cmnd *cmd | ||
458 | * The command to work on. The first scatter buffer's data are | ||
459 | * assumed to be already transfered into ptr/this_residual. | ||
460 | */ | ||
461 | |||
462 | static void merge_contiguous_buffers( Scsi_Cmnd *cmd ) | ||
463 | { | ||
464 | unsigned long endaddr; | ||
465 | #if (NDEBUG & NDEBUG_MERGING) | ||
466 | unsigned long oldlen = cmd->SCp.this_residual; | ||
467 | int cnt = 1; | ||
468 | #endif | ||
469 | |||
470 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; | ||
471 | cmd->SCp.buffers_residual && | ||
472 | virt_to_phys(page_address(cmd->SCp.buffer[1].page)+ | ||
473 | cmd->SCp.buffer[1].offset) == endaddr; ) { | ||
474 | MER_PRINTK("VTOP(%p) == %08lx -> merging\n", | ||
475 | cmd->SCp.buffer[1].address, endaddr); | ||
476 | #if (NDEBUG & NDEBUG_MERGING) | ||
477 | ++cnt; | ||
478 | #endif | ||
479 | ++cmd->SCp.buffer; | ||
480 | --cmd->SCp.buffers_residual; | ||
481 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | ||
482 | endaddr += cmd->SCp.buffer->length; | ||
483 | } | ||
484 | #if (NDEBUG & NDEBUG_MERGING) | ||
485 | if (oldlen != cmd->SCp.this_residual) | ||
486 | MER_PRINTK("merged %d buffers from %p, new length %08x\n", | ||
487 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); | ||
488 | #endif | ||
489 | } | ||
490 | |||
491 | /* | ||
492 | * Function : void initialize_SCp(Scsi_Cmnd *cmd) | ||
493 | * | ||
494 | * Purpose : initialize the saved data pointers for cmd to point to the | ||
495 | * start of the buffer. | ||
496 | * | ||
497 | * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. | ||
498 | */ | ||
499 | |||
500 | static __inline__ void initialize_SCp(Scsi_Cmnd *cmd) | ||
501 | { | ||
502 | /* | ||
503 | * Initialize the Scsi Pointer field so that all of the commands in the | ||
504 | * various queues are valid. | ||
505 | */ | ||
506 | |||
507 | if (cmd->use_sg) { | ||
508 | cmd->SCp.buffer = (struct scatterlist *) cmd->buffer; | ||
509 | cmd->SCp.buffers_residual = cmd->use_sg - 1; | ||
510 | cmd->SCp.ptr = (char *)page_address(cmd->SCp.buffer->page)+ | ||
511 | cmd->SCp.buffer->offset; | ||
512 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | ||
513 | /* ++roman: Try to merge some scatter-buffers if they are at | ||
514 | * contiguous physical addresses. | ||
515 | */ | ||
516 | merge_contiguous_buffers( cmd ); | ||
517 | } else { | ||
518 | cmd->SCp.buffer = NULL; | ||
519 | cmd->SCp.buffers_residual = 0; | ||
520 | cmd->SCp.ptr = (char *) cmd->request_buffer; | ||
521 | cmd->SCp.this_residual = cmd->request_bufflen; | ||
522 | } | ||
523 | } | ||
524 | |||
525 | #include <linux/config.h> | ||
526 | #include <linux/delay.h> | ||
527 | |||
528 | #if NDEBUG | ||
529 | static struct { | ||
530 | unsigned char mask; | ||
531 | const char * name;} | ||
532 | signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | ||
533 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | ||
534 | { SR_SEL, "SEL" }, {0, NULL}}, | ||
535 | basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}}, | ||
536 | icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | ||
537 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | ||
538 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | ||
539 | {0, NULL}}, | ||
540 | mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | ||
541 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | ||
542 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | ||
543 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | ||
544 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | ||
545 | {0, NULL}}; | ||
546 | |||
547 | /* | ||
548 | * Function : void NCR5380_print(struct Scsi_Host *instance) | ||
549 | * | ||
550 | * Purpose : print the SCSI bus signals for debugging purposes | ||
551 | * | ||
552 | * Input : instance - which NCR5380 | ||
553 | */ | ||
554 | |||
555 | static void NCR5380_print(struct Scsi_Host *instance) { | ||
556 | unsigned char status, data, basr, mr, icr, i; | ||
557 | unsigned long flags; | ||
558 | |||
559 | local_irq_save(flags); | ||
560 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | ||
561 | status = NCR5380_read(STATUS_REG); | ||
562 | mr = NCR5380_read(MODE_REG); | ||
563 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | ||
564 | basr = NCR5380_read(BUS_AND_STATUS_REG); | ||
565 | local_irq_restore(flags); | ||
566 | printk("STATUS_REG: %02x ", status); | ||
567 | for (i = 0; signals[i].mask ; ++i) | ||
568 | if (status & signals[i].mask) | ||
569 | printk(",%s", signals[i].name); | ||
570 | printk("\nBASR: %02x ", basr); | ||
571 | for (i = 0; basrs[i].mask ; ++i) | ||
572 | if (basr & basrs[i].mask) | ||
573 | printk(",%s", basrs[i].name); | ||
574 | printk("\nICR: %02x ", icr); | ||
575 | for (i = 0; icrs[i].mask; ++i) | ||
576 | if (icr & icrs[i].mask) | ||
577 | printk(",%s", icrs[i].name); | ||
578 | printk("\nMODE: %02x ", mr); | ||
579 | for (i = 0; mrs[i].mask; ++i) | ||
580 | if (mr & mrs[i].mask) | ||
581 | printk(",%s", mrs[i].name); | ||
582 | printk("\n"); | ||
583 | } | ||
584 | |||
585 | static struct { | ||
586 | unsigned char value; | ||
587 | const char *name; | ||
588 | } phases[] = { | ||
589 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, | ||
590 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | ||
591 | {PHASE_UNKNOWN, "UNKNOWN"}}; | ||
592 | |||
593 | /* | ||
594 | * Function : void NCR5380_print_phase(struct Scsi_Host *instance) | ||
595 | * | ||
596 | * Purpose : print the current SCSI phase for debugging purposes | ||
597 | * | ||
598 | * Input : instance - which NCR5380 | ||
599 | */ | ||
600 | |||
601 | static void NCR5380_print_phase(struct Scsi_Host *instance) | ||
602 | { | ||
603 | unsigned char status; | ||
604 | int i; | ||
605 | |||
606 | status = NCR5380_read(STATUS_REG); | ||
607 | if (!(status & SR_REQ)) | ||
608 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | ||
609 | else { | ||
610 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | ||
611 | (phases[i].value != (status & PHASE_MASK)); ++i); | ||
612 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | ||
613 | } | ||
614 | } | ||
615 | |||
616 | #else /* !NDEBUG */ | ||
617 | |||
618 | /* dummies... */ | ||
619 | __inline__ void NCR5380_print(struct Scsi_Host *instance) { }; | ||
620 | __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { }; | ||
621 | |||
622 | #endif | ||
623 | |||
624 | /* | ||
625 | * ++roman: New scheme of calling NCR5380_main() | ||
626 | * | ||
627 | * If we're not in an interrupt, we can call our main directly, it cannot be | ||
628 | * already running. Else, we queue it on a task queue, if not 'main_running' | ||
629 | * tells us that a lower level is already executing it. This way, | ||
630 | * 'main_running' needs not be protected in a special way. | ||
631 | * | ||
632 | * queue_main() is a utility function for putting our main onto the task | ||
633 | * queue, if main_running is false. It should be called only from a | ||
634 | * interrupt or bottom half. | ||
635 | */ | ||
636 | |||
637 | #include <linux/workqueue.h> | ||
638 | #include <linux/interrupt.h> | ||
639 | |||
640 | static volatile int main_running = 0; | ||
641 | static DECLARE_WORK(NCR5380_tqueue, (void (*)(void*))NCR5380_main, NULL); | ||
642 | |||
643 | static __inline__ void queue_main(void) | ||
644 | { | ||
645 | if (!main_running) { | ||
646 | /* If in interrupt and NCR5380_main() not already running, | ||
647 | queue it on the 'immediate' task queue, to be processed | ||
648 | immediately after the current interrupt processing has | ||
649 | finished. */ | ||
650 | schedule_work(&NCR5380_tqueue); | ||
651 | } | ||
652 | /* else: nothing to do: the running NCR5380_main() will pick up | ||
653 | any newly queued command. */ | ||
654 | } | ||
655 | |||
656 | |||
657 | static inline void NCR5380_all_init (void) | ||
658 | { | ||
659 | static int done = 0; | ||
660 | if (!done) { | ||
661 | INI_PRINTK("scsi : NCR5380_all_init()\n"); | ||
662 | done = 1; | ||
663 | } | ||
664 | } | ||
665 | |||
666 | |||
667 | /* | ||
668 | * Function : void NCR58380_print_options (struct Scsi_Host *instance) | ||
669 | * | ||
670 | * Purpose : called by probe code indicating the NCR5380 driver | ||
671 | * options that were selected. | ||
672 | * | ||
673 | * Inputs : instance, pointer to this instance. Unused. | ||
674 | */ | ||
675 | |||
676 | static void __init NCR5380_print_options (struct Scsi_Host *instance) | ||
677 | { | ||
678 | printk(" generic options" | ||
679 | #ifdef AUTOSENSE | ||
680 | " AUTOSENSE" | ||
681 | #endif | ||
682 | #ifdef REAL_DMA | ||
683 | " REAL DMA" | ||
684 | #endif | ||
685 | #ifdef PARITY | ||
686 | " PARITY" | ||
687 | #endif | ||
688 | #ifdef SUPPORT_TAGS | ||
689 | " SCSI-2 TAGGED QUEUING" | ||
690 | #endif | ||
691 | ); | ||
692 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); | ||
693 | } | ||
694 | |||
695 | /* | ||
696 | * Function : void NCR5380_print_status (struct Scsi_Host *instance) | ||
697 | * | ||
698 | * Purpose : print commands in the various queues, called from | ||
699 | * NCR5380_abort and NCR5380_debug to aid debugging. | ||
700 | * | ||
701 | * Inputs : instance, pointer to this instance. | ||
702 | */ | ||
703 | |||
704 | static void NCR5380_print_status (struct Scsi_Host *instance) | ||
705 | { | ||
706 | char *pr_bfr; | ||
707 | char *start; | ||
708 | int len; | ||
709 | |||
710 | NCR_PRINT(NDEBUG_ANY); | ||
711 | NCR_PRINT_PHASE(NDEBUG_ANY); | ||
712 | |||
713 | pr_bfr = (char *) __get_free_page(GFP_ATOMIC); | ||
714 | if (!pr_bfr) { | ||
715 | printk("NCR5380_print_status: no memory for print buffer\n"); | ||
716 | return; | ||
717 | } | ||
718 | len = NCR5380_proc_info(pr_bfr, &start, 0, PAGE_SIZE, HOSTNO, 0); | ||
719 | pr_bfr[len] = 0; | ||
720 | printk("\n%s\n", pr_bfr); | ||
721 | free_page((unsigned long) pr_bfr); | ||
722 | } | ||
723 | |||
724 | |||
725 | /******************************************/ | ||
726 | /* | ||
727 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] | ||
728 | * | ||
729 | * *buffer: I/O buffer | ||
730 | * **start: if inout == FALSE pointer into buffer where user read should start | ||
731 | * offset: current offset | ||
732 | * length: length of buffer | ||
733 | * hostno: Scsi_Host host_no | ||
734 | * inout: TRUE - user is writing; FALSE - user is reading | ||
735 | * | ||
736 | * Return the number of bytes read from or written | ||
737 | */ | ||
738 | |||
739 | #undef SPRINTF | ||
740 | #define SPRINTF(fmt,args...) \ | ||
741 | do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ | ||
742 | pos += sprintf(pos, fmt , ## args); } while(0) | ||
743 | static | ||
744 | char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length); | ||
745 | |||
746 | static | ||
747 | int NCR5380_proc_info (struct Scsi_Host *instance, char *buffer, char **start, off_t offset, | ||
748 | int length, int inout) | ||
749 | { | ||
750 | char *pos = buffer; | ||
751 | struct NCR5380_hostdata *hostdata; | ||
752 | Scsi_Cmnd *ptr; | ||
753 | unsigned long flags; | ||
754 | off_t begin = 0; | ||
755 | #define check_offset() \ | ||
756 | do { \ | ||
757 | if (pos - buffer < offset - begin) { \ | ||
758 | begin += pos - buffer; \ | ||
759 | pos = buffer; \ | ||
760 | } \ | ||
761 | } while (0) | ||
762 | |||
763 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | ||
764 | |||
765 | if (inout) { /* Has data been written to the file ? */ | ||
766 | return(-ENOSYS); /* Currently this is a no-op */ | ||
767 | } | ||
768 | SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); | ||
769 | check_offset(); | ||
770 | local_irq_save(flags); | ||
771 | SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't"); | ||
772 | check_offset(); | ||
773 | if (!hostdata->connected) | ||
774 | SPRINTF("scsi%d: no currently connected command\n", HOSTNO); | ||
775 | else | ||
776 | pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected, | ||
777 | pos, buffer, length); | ||
778 | SPRINTF("scsi%d: issue_queue\n", HOSTNO); | ||
779 | check_offset(); | ||
780 | for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) { | ||
781 | pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); | ||
782 | check_offset(); | ||
783 | } | ||
784 | |||
785 | SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); | ||
786 | check_offset(); | ||
787 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; | ||
788 | ptr = NEXT(ptr)) { | ||
789 | pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); | ||
790 | check_offset(); | ||
791 | } | ||
792 | |||
793 | local_irq_restore(flags); | ||
794 | *start = buffer + (offset - begin); | ||
795 | if (pos - buffer < offset - begin) | ||
796 | return 0; | ||
797 | else if (pos - buffer - (offset - begin) < length) | ||
798 | return pos - buffer - (offset - begin); | ||
799 | return length; | ||
800 | } | ||
801 | |||
802 | static char * | ||
803 | lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length) | ||
804 | { | ||
805 | int i, s; | ||
806 | unsigned char *command; | ||
807 | SPRINTF("scsi%d: destination target %d, lun %d\n", | ||
808 | H_NO(cmd), cmd->device->id, cmd->device->lun); | ||
809 | SPRINTF(" command = "); | ||
810 | command = cmd->cmnd; | ||
811 | SPRINTF("%2d (0x%02x)", command[0], command[0]); | ||
812 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | ||
813 | SPRINTF(" %02x", command[i]); | ||
814 | SPRINTF("\n"); | ||
815 | return pos; | ||
816 | } | ||
817 | |||
818 | |||
819 | /* | ||
820 | * Function : void NCR5380_init (struct Scsi_Host *instance) | ||
821 | * | ||
822 | * Purpose : initializes *instance and corresponding 5380 chip. | ||
823 | * | ||
824 | * Inputs : instance - instantiation of the 5380 driver. | ||
825 | * | ||
826 | * Notes : I assume that the host, hostno, and id bits have been | ||
827 | * set correctly. I don't care about the irq and other fields. | ||
828 | * | ||
829 | */ | ||
830 | |||
831 | static int NCR5380_init (struct Scsi_Host *instance, int flags) | ||
832 | { | ||
833 | int i; | ||
834 | SETUP_HOSTDATA(instance); | ||
835 | |||
836 | NCR5380_all_init(); | ||
837 | |||
838 | hostdata->aborted = 0; | ||
839 | hostdata->id_mask = 1 << instance->this_id; | ||
840 | hostdata->id_higher_mask = 0; | ||
841 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | ||
842 | if (i > hostdata->id_mask) | ||
843 | hostdata->id_higher_mask |= i; | ||
844 | for (i = 0; i < 8; ++i) | ||
845 | hostdata->busy[i] = 0; | ||
846 | #ifdef SUPPORT_TAGS | ||
847 | init_tags(); | ||
848 | #endif | ||
849 | #if defined (REAL_DMA) | ||
850 | hostdata->dma_len = 0; | ||
851 | #endif | ||
852 | hostdata->targets_present = 0; | ||
853 | hostdata->connected = NULL; | ||
854 | hostdata->issue_queue = NULL; | ||
855 | hostdata->disconnected_queue = NULL; | ||
856 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; | ||
857 | |||
858 | if (!the_template) { | ||
859 | the_template = instance->hostt; | ||
860 | first_instance = instance; | ||
861 | } | ||
862 | |||
863 | |||
864 | #ifndef AUTOSENSE | ||
865 | if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) | ||
866 | printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" | ||
867 | " without AUTOSENSE option, contingent allegiance conditions may\n" | ||
868 | " be incorrectly cleared.\n", HOSTNO); | ||
869 | #endif /* def AUTOSENSE */ | ||
870 | |||
871 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
872 | NCR5380_write(MODE_REG, MR_BASE); | ||
873 | NCR5380_write(TARGET_COMMAND_REG, 0); | ||
874 | NCR5380_write(SELECT_ENABLE_REG, 0); | ||
875 | |||
876 | return 0; | ||
877 | } | ||
878 | |||
879 | /* | ||
880 | * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, | ||
881 | * void (*done)(Scsi_Cmnd *)) | ||
882 | * | ||
883 | * Purpose : enqueues a SCSI command | ||
884 | * | ||
885 | * Inputs : cmd - SCSI command, done - function called on completion, with | ||
886 | * a pointer to the command descriptor. | ||
887 | * | ||
888 | * Returns : 0 | ||
889 | * | ||
890 | * Side effects : | ||
891 | * cmd is added to the per instance issue_queue, with minor | ||
892 | * twiddling done to the host specific fields of cmd. If the | ||
893 | * main coroutine is not running, it is restarted. | ||
894 | * | ||
895 | */ | ||
896 | |||
897 | static | ||
898 | int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) | ||
899 | { | ||
900 | SETUP_HOSTDATA(cmd->device->host); | ||
901 | Scsi_Cmnd *tmp; | ||
902 | int oldto; | ||
903 | unsigned long flags; | ||
904 | extern int update_timeout(Scsi_Cmnd * SCset, int timeout); | ||
905 | |||
906 | #if (NDEBUG & NDEBUG_NO_WRITE) | ||
907 | switch (cmd->cmnd[0]) { | ||
908 | case WRITE_6: | ||
909 | case WRITE_10: | ||
910 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | ||
911 | H_NO(cmd)); | ||
912 | cmd->result = (DID_ERROR << 16); | ||
913 | done(cmd); | ||
914 | return 0; | ||
915 | } | ||
916 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | ||
917 | |||
918 | |||
919 | #ifdef NCR5380_STATS | ||
920 | # if 0 | ||
921 | if (!hostdata->connected && !hostdata->issue_queue && | ||
922 | !hostdata->disconnected_queue) { | ||
923 | hostdata->timebase = jiffies; | ||
924 | } | ||
925 | # endif | ||
926 | # ifdef NCR5380_STAT_LIMIT | ||
927 | if (cmd->request_bufflen > NCR5380_STAT_LIMIT) | ||
928 | # endif | ||
929 | switch (cmd->cmnd[0]) | ||
930 | { | ||
931 | case WRITE: | ||
932 | case WRITE_6: | ||
933 | case WRITE_10: | ||
934 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); | ||
935 | hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; | ||
936 | hostdata->pendingw++; | ||
937 | break; | ||
938 | case READ: | ||
939 | case READ_6: | ||
940 | case READ_10: | ||
941 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); | ||
942 | hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; | ||
943 | hostdata->pendingr++; | ||
944 | break; | ||
945 | } | ||
946 | #endif | ||
947 | |||
948 | /* | ||
949 | * We use the host_scribble field as a pointer to the next command | ||
950 | * in a queue | ||
951 | */ | ||
952 | |||
953 | NEXT(cmd) = NULL; | ||
954 | cmd->scsi_done = done; | ||
955 | |||
956 | cmd->result = 0; | ||
957 | |||
958 | |||
959 | /* | ||
960 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | ||
961 | * commands are added to the head of the queue since any command will | ||
962 | * clear the contingent allegiance condition that exists and the | ||
963 | * sense data is only guaranteed to be valid while the condition exists. | ||
964 | */ | ||
965 | |||
966 | local_irq_save(flags); | ||
967 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. | ||
968 | * Otherwise a running NCR5380_main may steal the lock. | ||
969 | * Lock before actually inserting due to fairness reasons explained in | ||
970 | * atari_scsi.c. If we insert first, then it's impossible for this driver | ||
971 | * to release the lock. | ||
972 | * Stop timer for this command while waiting for the lock, or timeouts | ||
973 | * may happen (and they really do), and it's no good if the command doesn't | ||
974 | * appear in any of the queues. | ||
975 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | ||
976 | * because also a timer int can trigger an abort or reset, which would | ||
977 | * alter queues and touch the lock. | ||
978 | */ | ||
979 | if (!IS_A_TT()) { | ||
980 | oldto = update_timeout(cmd, 0); | ||
981 | falcon_get_lock(); | ||
982 | update_timeout(cmd, oldto); | ||
983 | } | ||
984 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | ||
985 | LIST(cmd, hostdata->issue_queue); | ||
986 | NEXT(cmd) = hostdata->issue_queue; | ||
987 | hostdata->issue_queue = cmd; | ||
988 | } else { | ||
989 | for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; | ||
990 | NEXT(tmp); tmp = NEXT(tmp)) | ||
991 | ; | ||
992 | LIST(cmd, tmp); | ||
993 | NEXT(tmp) = cmd; | ||
994 | } | ||
995 | local_irq_restore(flags); | ||
996 | |||
997 | QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), | ||
998 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | ||
999 | |||
1000 | /* If queue_command() is called from an interrupt (real one or bottom | ||
1001 | * half), we let queue_main() do the job of taking care about main. If it | ||
1002 | * is already running, this is a no-op, else main will be queued. | ||
1003 | * | ||
1004 | * If we're not in an interrupt, we can call NCR5380_main() | ||
1005 | * unconditionally, because it cannot be already running. | ||
1006 | */ | ||
1007 | if (in_interrupt() || ((flags >> 8) & 7) >= 6) | ||
1008 | queue_main(); | ||
1009 | else | ||
1010 | NCR5380_main(NULL); | ||
1011 | return 0; | ||
1012 | } | ||
1013 | |||
1014 | /* | ||
1015 | * Function : NCR5380_main (void) | ||
1016 | * | ||
1017 | * Purpose : NCR5380_main is a coroutine that runs as long as more work can | ||
1018 | * be done on the NCR5380 host adapters in a system. Both | ||
1019 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | ||
1020 | * in case it is not running. | ||
1021 | * | ||
1022 | * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should | ||
1023 | * reenable them. This prevents reentrancy and kernel stack overflow. | ||
1024 | */ | ||
1025 | |||
1026 | static void NCR5380_main (void *bl) | ||
1027 | { | ||
1028 | Scsi_Cmnd *tmp, *prev; | ||
1029 | struct Scsi_Host *instance = first_instance; | ||
1030 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); | ||
1031 | int done; | ||
1032 | unsigned long flags; | ||
1033 | |||
1034 | /* | ||
1035 | * We run (with interrupts disabled) until we're sure that none of | ||
1036 | * the host adapters have anything that can be done, at which point | ||
1037 | * we set main_running to 0 and exit. | ||
1038 | * | ||
1039 | * Interrupts are enabled before doing various other internal | ||
1040 | * instructions, after we've decided that we need to run through | ||
1041 | * the loop again. | ||
1042 | * | ||
1043 | * this should prevent any race conditions. | ||
1044 | * | ||
1045 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | ||
1046 | * because also a timer int can trigger an abort or reset, which can | ||
1047 | * alter queues and touch the Falcon lock. | ||
1048 | */ | ||
1049 | |||
1050 | /* Tell int handlers main() is now already executing. Note that | ||
1051 | no races are possible here. If an int comes in before | ||
1052 | 'main_running' is set here, and queues/executes main via the | ||
1053 | task queue, it doesn't do any harm, just this instance of main | ||
1054 | won't find any work left to do. */ | ||
1055 | if (main_running) | ||
1056 | return; | ||
1057 | main_running = 1; | ||
1058 | |||
1059 | local_save_flags(flags); | ||
1060 | do { | ||
1061 | local_irq_disable(); /* Freeze request queues */ | ||
1062 | done = 1; | ||
1063 | |||
1064 | if (!hostdata->connected) { | ||
1065 | MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO ); | ||
1066 | /* | ||
1067 | * Search through the issue_queue for a command destined | ||
1068 | * for a target that's not busy. | ||
1069 | */ | ||
1070 | #if (NDEBUG & NDEBUG_LISTS) | ||
1071 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; | ||
1072 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) | ||
1073 | ; | ||
1074 | /*printk("%p ", tmp);*/ | ||
1075 | if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/ | ||
1076 | #endif | ||
1077 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, | ||
1078 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) { | ||
1079 | |||
1080 | #if (NDEBUG & NDEBUG_LISTS) | ||
1081 | if (prev != tmp) | ||
1082 | printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", | ||
1083 | tmp, tmp->device->id, hostdata->busy[tmp->device->id], | ||
1084 | tmp->device->lun); | ||
1085 | #endif | ||
1086 | /* When we find one, remove it from the issue queue. */ | ||
1087 | /* ++guenther: possible race with Falcon locking */ | ||
1088 | if ( | ||
1089 | #ifdef SUPPORT_TAGS | ||
1090 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) | ||
1091 | #else | ||
1092 | !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) | ||
1093 | #endif | ||
1094 | ) { | ||
1095 | /* ++guenther: just to be sure, this must be atomic */ | ||
1096 | local_irq_disable(); | ||
1097 | if (prev) { | ||
1098 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | ||
1099 | NEXT(prev) = NEXT(tmp); | ||
1100 | } else { | ||
1101 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | ||
1102 | hostdata->issue_queue = NEXT(tmp); | ||
1103 | } | ||
1104 | NEXT(tmp) = NULL; | ||
1105 | falcon_dont_release++; | ||
1106 | |||
1107 | /* reenable interrupts after finding one */ | ||
1108 | local_irq_restore(flags); | ||
1109 | |||
1110 | /* | ||
1111 | * Attempt to establish an I_T_L nexus here. | ||
1112 | * On success, instance->hostdata->connected is set. | ||
1113 | * On failure, we must add the command back to the | ||
1114 | * issue queue so we can keep trying. | ||
1115 | */ | ||
1116 | MAIN_PRINTK("scsi%d: main(): command for target %d " | ||
1117 | "lun %d removed from issue_queue\n", | ||
1118 | HOSTNO, tmp->device->id, tmp->device->lun); | ||
1119 | /* | ||
1120 | * REQUEST SENSE commands are issued without tagged | ||
1121 | * queueing, even on SCSI-II devices because the | ||
1122 | * contingent allegiance condition exists for the | ||
1123 | * entire unit. | ||
1124 | */ | ||
1125 | /* ++roman: ...and the standard also requires that | ||
1126 | * REQUEST SENSE command are untagged. | ||
1127 | */ | ||
1128 | |||
1129 | #ifdef SUPPORT_TAGS | ||
1130 | cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE ); | ||
1131 | #endif | ||
1132 | if (!NCR5380_select(instance, tmp, | ||
1133 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : | ||
1134 | TAG_NEXT)) { | ||
1135 | falcon_dont_release--; | ||
1136 | /* release if target did not response! */ | ||
1137 | falcon_release_lock_if_possible( hostdata ); | ||
1138 | break; | ||
1139 | } else { | ||
1140 | local_irq_disable(); | ||
1141 | LIST(tmp, hostdata->issue_queue); | ||
1142 | NEXT(tmp) = hostdata->issue_queue; | ||
1143 | hostdata->issue_queue = tmp; | ||
1144 | #ifdef SUPPORT_TAGS | ||
1145 | cmd_free_tag( tmp ); | ||
1146 | #endif | ||
1147 | falcon_dont_release--; | ||
1148 | local_irq_restore(flags); | ||
1149 | MAIN_PRINTK("scsi%d: main(): select() failed, " | ||
1150 | "returned to issue_queue\n", HOSTNO); | ||
1151 | if (hostdata->connected) | ||
1152 | break; | ||
1153 | } | ||
1154 | } /* if target/lun/target queue is not busy */ | ||
1155 | } /* for issue_queue */ | ||
1156 | } /* if (!hostdata->connected) */ | ||
1157 | |||
1158 | if (hostdata->connected | ||
1159 | #ifdef REAL_DMA | ||
1160 | && !hostdata->dma_len | ||
1161 | #endif | ||
1162 | ) { | ||
1163 | local_irq_restore(flags); | ||
1164 | MAIN_PRINTK("scsi%d: main: performing information transfer\n", | ||
1165 | HOSTNO); | ||
1166 | NCR5380_information_transfer(instance); | ||
1167 | MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); | ||
1168 | done = 0; | ||
1169 | } | ||
1170 | } while (!done); | ||
1171 | |||
1172 | /* Better allow ints _after_ 'main_running' has been cleared, else | ||
1173 | an interrupt could believe we'll pick up the work it left for | ||
1174 | us, but we won't see it anymore here... */ | ||
1175 | main_running = 0; | ||
1176 | local_irq_restore(flags); | ||
1177 | } | ||
1178 | |||
1179 | |||
1180 | #ifdef REAL_DMA | ||
1181 | /* | ||
1182 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | ||
1183 | * | ||
1184 | * Purpose : Called by interrupt handler when DMA finishes or a phase | ||
1185 | * mismatch occurs (which would finish the DMA transfer). | ||
1186 | * | ||
1187 | * Inputs : instance - this instance of the NCR5380. | ||
1188 | * | ||
1189 | */ | ||
1190 | |||
1191 | static void NCR5380_dma_complete( struct Scsi_Host *instance ) | ||
1192 | { | ||
1193 | SETUP_HOSTDATA(instance); | ||
1194 | int transfered, saved_data = 0, overrun = 0, cnt, toPIO; | ||
1195 | unsigned char **data, p; | ||
1196 | volatile int *count; | ||
1197 | |||
1198 | if (!hostdata->connected) { | ||
1199 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | ||
1200 | "no connected cmd\n", HOSTNO); | ||
1201 | return; | ||
1202 | } | ||
1203 | |||
1204 | if (atari_read_overruns) { | ||
1205 | p = hostdata->connected->SCp.phase; | ||
1206 | if (p & SR_IO) { | ||
1207 | udelay(10); | ||
1208 | if ((((NCR5380_read(BUS_AND_STATUS_REG)) & | ||
1209 | (BASR_PHASE_MATCH|BASR_ACK)) == | ||
1210 | (BASR_PHASE_MATCH|BASR_ACK))) { | ||
1211 | saved_data = NCR5380_read(INPUT_DATA_REG); | ||
1212 | overrun = 1; | ||
1213 | DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO); | ||
1214 | } | ||
1215 | } | ||
1216 | } | ||
1217 | |||
1218 | DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", | ||
1219 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), | ||
1220 | NCR5380_read(STATUS_REG)); | ||
1221 | |||
1222 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1223 | NCR5380_write(MODE_REG, MR_BASE); | ||
1224 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1225 | |||
1226 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); | ||
1227 | hostdata->dma_len = 0; | ||
1228 | |||
1229 | data = (unsigned char **) &(hostdata->connected->SCp.ptr); | ||
1230 | count = &(hostdata->connected->SCp.this_residual); | ||
1231 | *data += transfered; | ||
1232 | *count -= transfered; | ||
1233 | |||
1234 | if (atari_read_overruns) { | ||
1235 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { | ||
1236 | cnt = toPIO = atari_read_overruns; | ||
1237 | if (overrun) { | ||
1238 | DMA_PRINTK("Got an input overrun, using saved byte\n"); | ||
1239 | *(*data)++ = saved_data; | ||
1240 | (*count)--; | ||
1241 | cnt--; | ||
1242 | toPIO--; | ||
1243 | } | ||
1244 | DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); | ||
1245 | NCR5380_transfer_pio(instance, &p, &cnt, data); | ||
1246 | *count -= toPIO - cnt; | ||
1247 | } | ||
1248 | } | ||
1249 | } | ||
1250 | #endif /* REAL_DMA */ | ||
1251 | |||
1252 | |||
1253 | /* | ||
1254 | * Function : void NCR5380_intr (int irq) | ||
1255 | * | ||
1256 | * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | ||
1257 | * from the disconnected queue, and restarting NCR5380_main() | ||
1258 | * as required. | ||
1259 | * | ||
1260 | * Inputs : int irq, irq that caused this interrupt. | ||
1261 | * | ||
1262 | */ | ||
1263 | |||
1264 | static irqreturn_t NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs) | ||
1265 | { | ||
1266 | struct Scsi_Host *instance = first_instance; | ||
1267 | int done = 1, handled = 0; | ||
1268 | unsigned char basr; | ||
1269 | |||
1270 | INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); | ||
1271 | |||
1272 | /* Look for pending interrupts */ | ||
1273 | basr = NCR5380_read(BUS_AND_STATUS_REG); | ||
1274 | INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); | ||
1275 | /* dispatch to appropriate routine if found and done=0 */ | ||
1276 | if (basr & BASR_IRQ) { | ||
1277 | NCR_PRINT(NDEBUG_INTR); | ||
1278 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { | ||
1279 | done = 0; | ||
1280 | ENABLE_IRQ(); | ||
1281 | INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); | ||
1282 | NCR5380_reselect(instance); | ||
1283 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1284 | } | ||
1285 | else if (basr & BASR_PARITY_ERROR) { | ||
1286 | INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); | ||
1287 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1288 | } | ||
1289 | else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | ||
1290 | INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); | ||
1291 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1292 | } | ||
1293 | else { | ||
1294 | /* | ||
1295 | * The rest of the interrupt conditions can occur only during a | ||
1296 | * DMA transfer | ||
1297 | */ | ||
1298 | |||
1299 | #if defined(REAL_DMA) | ||
1300 | /* | ||
1301 | * We should only get PHASE MISMATCH and EOP interrupts if we have | ||
1302 | * DMA enabled, so do a sanity check based on the current setting | ||
1303 | * of the MODE register. | ||
1304 | */ | ||
1305 | |||
1306 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | ||
1307 | ((basr & BASR_END_DMA_TRANSFER) || | ||
1308 | !(basr & BASR_PHASE_MATCH))) { | ||
1309 | |||
1310 | INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); | ||
1311 | NCR5380_dma_complete( instance ); | ||
1312 | done = 0; | ||
1313 | ENABLE_IRQ(); | ||
1314 | } else | ||
1315 | #endif /* REAL_DMA */ | ||
1316 | { | ||
1317 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ | ||
1318 | if (basr & BASR_PHASE_MATCH) | ||
1319 | printk(KERN_NOTICE "scsi%d: unknown interrupt, " | ||
1320 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", | ||
1321 | HOSTNO, basr, NCR5380_read(MODE_REG), | ||
1322 | NCR5380_read(STATUS_REG)); | ||
1323 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1324 | } | ||
1325 | } /* if !(SELECTION || PARITY) */ | ||
1326 | handled = 1; | ||
1327 | } /* BASR & IRQ */ | ||
1328 | else { | ||
1329 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | ||
1330 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | ||
1331 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | ||
1332 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | ||
1333 | } | ||
1334 | |||
1335 | if (!done) { | ||
1336 | INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); | ||
1337 | /* Put a call to NCR5380_main() on the queue... */ | ||
1338 | queue_main(); | ||
1339 | } | ||
1340 | return IRQ_RETVAL(handled); | ||
1341 | } | ||
1342 | |||
1343 | #ifdef NCR5380_STATS | ||
1344 | static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd) | ||
1345 | { | ||
1346 | # ifdef NCR5380_STAT_LIMIT | ||
1347 | if (cmd->request_bufflen > NCR5380_STAT_LIMIT) | ||
1348 | # endif | ||
1349 | switch (cmd->cmnd[0]) | ||
1350 | { | ||
1351 | case WRITE: | ||
1352 | case WRITE_6: | ||
1353 | case WRITE_10: | ||
1354 | hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); | ||
1355 | /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/ | ||
1356 | hostdata->pendingw--; | ||
1357 | break; | ||
1358 | case READ: | ||
1359 | case READ_6: | ||
1360 | case READ_10: | ||
1361 | hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); | ||
1362 | /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/ | ||
1363 | hostdata->pendingr--; | ||
1364 | break; | ||
1365 | } | ||
1366 | } | ||
1367 | #endif | ||
1368 | |||
1369 | /* | ||
1370 | * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, | ||
1371 | * int tag); | ||
1372 | * | ||
1373 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | ||
1374 | * including ARBITRATION, SELECTION, and initial message out for | ||
1375 | * IDENTIFY and queue messages. | ||
1376 | * | ||
1377 | * Inputs : instance - instantiation of the 5380 driver on which this | ||
1378 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for | ||
1379 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for | ||
1380 | * the command that is presently connected. | ||
1381 | * | ||
1382 | * Returns : -1 if selection could not execute for some reason, | ||
1383 | * 0 if selection succeeded or failed because the target | ||
1384 | * did not respond. | ||
1385 | * | ||
1386 | * Side effects : | ||
1387 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | ||
1388 | * with registers as they should have been on entry - ie | ||
1389 | * SELECT_ENABLE will be set appropriately, the NCR5380 | ||
1390 | * will cease to drive any SCSI bus signals. | ||
1391 | * | ||
1392 | * If successful : I_T_L or I_T_L_Q nexus will be established, | ||
1393 | * instance->connected will be set to cmd. | ||
1394 | * SELECT interrupt will be disabled. | ||
1395 | * | ||
1396 | * If failed (no target) : cmd->scsi_done() will be called, and the | ||
1397 | * cmd->result host byte set to DID_BAD_TARGET. | ||
1398 | */ | ||
1399 | |||
1400 | static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag) | ||
1401 | { | ||
1402 | SETUP_HOSTDATA(instance); | ||
1403 | unsigned char tmp[3], phase; | ||
1404 | unsigned char *data; | ||
1405 | int len; | ||
1406 | unsigned long timeout; | ||
1407 | unsigned long flags; | ||
1408 | |||
1409 | hostdata->restart_select = 0; | ||
1410 | NCR_PRINT(NDEBUG_ARBITRATION); | ||
1411 | ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO, | ||
1412 | instance->this_id); | ||
1413 | |||
1414 | /* | ||
1415 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | ||
1416 | * data bus during SELECTION. | ||
1417 | */ | ||
1418 | |||
1419 | local_irq_save(flags); | ||
1420 | if (hostdata->connected) { | ||
1421 | local_irq_restore(flags); | ||
1422 | return -1; | ||
1423 | } | ||
1424 | NCR5380_write(TARGET_COMMAND_REG, 0); | ||
1425 | |||
1426 | |||
1427 | /* | ||
1428 | * Start arbitration. | ||
1429 | */ | ||
1430 | |||
1431 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | ||
1432 | NCR5380_write(MODE_REG, MR_ARBITRATE); | ||
1433 | |||
1434 | local_irq_restore(flags); | ||
1435 | |||
1436 | /* Wait for arbitration logic to complete */ | ||
1437 | #if NCR_TIMEOUT | ||
1438 | { | ||
1439 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; | ||
1440 | |||
1441 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) | ||
1442 | && time_before(jiffies, timeout) && !hostdata->connected) | ||
1443 | ; | ||
1444 | if (time_after_eq(jiffies, timeout)) | ||
1445 | { | ||
1446 | printk("scsi : arbitration timeout at %d\n", __LINE__); | ||
1447 | NCR5380_write(MODE_REG, MR_BASE); | ||
1448 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
1449 | return -1; | ||
1450 | } | ||
1451 | } | ||
1452 | #else /* NCR_TIMEOUT */ | ||
1453 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) | ||
1454 | && !hostdata->connected); | ||
1455 | #endif | ||
1456 | |||
1457 | ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO); | ||
1458 | |||
1459 | if (hostdata->connected) { | ||
1460 | NCR5380_write(MODE_REG, MR_BASE); | ||
1461 | return -1; | ||
1462 | } | ||
1463 | /* | ||
1464 | * The arbitration delay is 2.2us, but this is a minimum and there is | ||
1465 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | ||
1466 | * the integral nature of udelay(). | ||
1467 | * | ||
1468 | */ | ||
1469 | |||
1470 | udelay(3); | ||
1471 | |||
1472 | /* Check for lost arbitration */ | ||
1473 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | ||
1474 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | ||
1475 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | ||
1476 | hostdata->connected) { | ||
1477 | NCR5380_write(MODE_REG, MR_BASE); | ||
1478 | ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", | ||
1479 | HOSTNO); | ||
1480 | return -1; | ||
1481 | } | ||
1482 | |||
1483 | /* after/during arbitration, BSY should be asserted. | ||
1484 | IBM DPES-31080 Version S31Q works now */ | ||
1485 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ | ||
1486 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL | | ||
1487 | ICR_ASSERT_BSY ) ; | ||
1488 | |||
1489 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | ||
1490 | hostdata->connected) { | ||
1491 | NCR5380_write(MODE_REG, MR_BASE); | ||
1492 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1493 | ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", | ||
1494 | HOSTNO); | ||
1495 | return -1; | ||
1496 | } | ||
1497 | |||
1498 | /* | ||
1499 | * Again, bus clear + bus settle time is 1.2us, however, this is | ||
1500 | * a minimum so we'll udelay ceil(1.2) | ||
1501 | */ | ||
1502 | |||
1503 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY | ||
1504 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ | ||
1505 | udelay(15); | ||
1506 | #else | ||
1507 | udelay(2); | ||
1508 | #endif | ||
1509 | |||
1510 | if (hostdata->connected) { | ||
1511 | NCR5380_write(MODE_REG, MR_BASE); | ||
1512 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1513 | return -1; | ||
1514 | } | ||
1515 | |||
1516 | ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO); | ||
1517 | |||
1518 | /* | ||
1519 | * Now that we have won arbitration, start Selection process, asserting | ||
1520 | * the host and target ID's on the SCSI bus. | ||
1521 | */ | ||
1522 | |||
1523 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | ||
1524 | |||
1525 | /* | ||
1526 | * Raise ATN while SEL is true before BSY goes false from arbitration, | ||
1527 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | ||
1528 | * phase immediately after selection. | ||
1529 | */ | ||
1530 | |||
1531 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | ||
1532 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | ||
1533 | NCR5380_write(MODE_REG, MR_BASE); | ||
1534 | |||
1535 | /* | ||
1536 | * Reselect interrupts must be turned off prior to the dropping of BSY, | ||
1537 | * otherwise we will trigger an interrupt. | ||
1538 | */ | ||
1539 | |||
1540 | if (hostdata->connected) { | ||
1541 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1542 | return -1; | ||
1543 | } | ||
1544 | |||
1545 | NCR5380_write(SELECT_ENABLE_REG, 0); | ||
1546 | |||
1547 | /* | ||
1548 | * The initiator shall then wait at least two deskew delays and release | ||
1549 | * the BSY signal. | ||
1550 | */ | ||
1551 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | ||
1552 | |||
1553 | /* Reset BSY */ | ||
1554 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | ||
1555 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | ||
1556 | |||
1557 | /* | ||
1558 | * Something weird happens when we cease to drive BSY - looks | ||
1559 | * like the board/chip is letting us do another read before the | ||
1560 | * appropriate propagation delay has expired, and we're confusing | ||
1561 | * a BSY signal from ourselves as the target's response to SELECTION. | ||
1562 | * | ||
1563 | * A small delay (the 'C++' frontend breaks the pipeline with an | ||
1564 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | ||
1565 | * tighter 'C' code breaks and requires this) solves the problem - | ||
1566 | * the 1 us delay is arbitrary, and only used because this delay will | ||
1567 | * be the same on other platforms and since it works here, it should | ||
1568 | * work there. | ||
1569 | * | ||
1570 | * wingel suggests that this could be due to failing to wait | ||
1571 | * one deskew delay. | ||
1572 | */ | ||
1573 | |||
1574 | udelay(1); | ||
1575 | |||
1576 | SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); | ||
1577 | |||
1578 | /* | ||
1579 | * The SCSI specification calls for a 250 ms timeout for the actual | ||
1580 | * selection. | ||
1581 | */ | ||
1582 | |||
1583 | timeout = jiffies + 25; | ||
1584 | |||
1585 | /* | ||
1586 | * XXX very interesting - we're seeing a bounce where the BSY we | ||
1587 | * asserted is being reflected / still asserted (propagation delay?) | ||
1588 | * and it's detecting as true. Sigh. | ||
1589 | */ | ||
1590 | |||
1591 | #if 0 | ||
1592 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert | ||
1593 | * IO while SEL is true. But again, there are some disks out the in the | ||
1594 | * world that do that nevertheless. (Somebody claimed that this announces | ||
1595 | * reselection capability of the target.) So we better skip that test and | ||
1596 | * only wait for BSY... (Famous german words: Der Kl�gere gibt nach :-) | ||
1597 | */ | ||
1598 | |||
1599 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & | ||
1600 | (SR_BSY | SR_IO))); | ||
1601 | |||
1602 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == | ||
1603 | (SR_SEL | SR_IO)) { | ||
1604 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1605 | NCR5380_reselect(instance); | ||
1606 | printk (KERN_ERR "scsi%d: reselection after won arbitration?\n", | ||
1607 | HOSTNO); | ||
1608 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
1609 | return -1; | ||
1610 | } | ||
1611 | #else | ||
1612 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)); | ||
1613 | #endif | ||
1614 | |||
1615 | /* | ||
1616 | * No less than two deskew delays after the initiator detects the | ||
1617 | * BSY signal is true, it shall release the SEL signal and may | ||
1618 | * change the DATA BUS. -wingel | ||
1619 | */ | ||
1620 | |||
1621 | udelay(1); | ||
1622 | |||
1623 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | ||
1624 | |||
1625 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { | ||
1626 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1627 | if (hostdata->targets_present & (1 << cmd->device->id)) { | ||
1628 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); | ||
1629 | if (hostdata->restart_select) | ||
1630 | printk(KERN_NOTICE "\trestart select\n"); | ||
1631 | NCR_PRINT(NDEBUG_ANY); | ||
1632 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
1633 | return -1; | ||
1634 | } | ||
1635 | cmd->result = DID_BAD_TARGET << 16; | ||
1636 | #ifdef NCR5380_STATS | ||
1637 | collect_stats(hostdata, cmd); | ||
1638 | #endif | ||
1639 | #ifdef SUPPORT_TAGS | ||
1640 | cmd_free_tag( cmd ); | ||
1641 | #endif | ||
1642 | cmd->scsi_done(cmd); | ||
1643 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
1644 | SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO); | ||
1645 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
1646 | return 0; | ||
1647 | } | ||
1648 | |||
1649 | hostdata->targets_present |= (1 << cmd->device->id); | ||
1650 | |||
1651 | /* | ||
1652 | * Since we followed the SCSI spec, and raised ATN while SEL | ||
1653 | * was true but before BSY was false during selection, the information | ||
1654 | * transfer phase should be a MESSAGE OUT phase so that we can send the | ||
1655 | * IDENTIFY message. | ||
1656 | * | ||
1657 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | ||
1658 | * message (2 bytes) with a tag ID that we increment with every command | ||
1659 | * until it wraps back to 0. | ||
1660 | * | ||
1661 | * XXX - it turns out that there are some broken SCSI-II devices, | ||
1662 | * which claim to support tagged queuing but fail when more than | ||
1663 | * some number of commands are issued at once. | ||
1664 | */ | ||
1665 | |||
1666 | /* Wait for start of REQ/ACK handshake */ | ||
1667 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); | ||
1668 | |||
1669 | SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n", | ||
1670 | HOSTNO, cmd->device->id); | ||
1671 | tmp[0] = IDENTIFY(1, cmd->device->lun); | ||
1672 | |||
1673 | #ifdef SUPPORT_TAGS | ||
1674 | if (cmd->tag != TAG_NONE) { | ||
1675 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | ||
1676 | tmp[2] = cmd->tag; | ||
1677 | len = 3; | ||
1678 | } else | ||
1679 | len = 1; | ||
1680 | #else | ||
1681 | len = 1; | ||
1682 | cmd->tag=0; | ||
1683 | #endif /* SUPPORT_TAGS */ | ||
1684 | |||
1685 | /* Send message(s) */ | ||
1686 | data = tmp; | ||
1687 | phase = PHASE_MSGOUT; | ||
1688 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
1689 | SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO); | ||
1690 | /* XXX need to handle errors here */ | ||
1691 | hostdata->connected = cmd; | ||
1692 | #ifndef SUPPORT_TAGS | ||
1693 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | ||
1694 | #endif | ||
1695 | |||
1696 | initialize_SCp(cmd); | ||
1697 | |||
1698 | |||
1699 | return 0; | ||
1700 | } | ||
1701 | |||
1702 | /* | ||
1703 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | ||
1704 | * unsigned char *phase, int *count, unsigned char **data) | ||
1705 | * | ||
1706 | * Purpose : transfers data in given phase using polled I/O | ||
1707 | * | ||
1708 | * Inputs : instance - instance of driver, *phase - pointer to | ||
1709 | * what phase is expected, *count - pointer to number of | ||
1710 | * bytes to transfer, **data - pointer to data pointer. | ||
1711 | * | ||
1712 | * Returns : -1 when different phase is entered without transferring | ||
1713 | * maximum number of bytes, 0 if all bytes are transfered or exit | ||
1714 | * is in same phase. | ||
1715 | * | ||
1716 | * Also, *phase, *count, *data are modified in place. | ||
1717 | * | ||
1718 | * XXX Note : handling for bus free may be useful. | ||
1719 | */ | ||
1720 | |||
1721 | /* | ||
1722 | * Note : this code is not as quick as it could be, however it | ||
1723 | * IS 100% reliable, and for the actual data transfer where speed | ||
1724 | * counts, we will always do a pseudo DMA or DMA transfer. | ||
1725 | */ | ||
1726 | |||
1727 | static int NCR5380_transfer_pio( struct Scsi_Host *instance, | ||
1728 | unsigned char *phase, int *count, | ||
1729 | unsigned char **data) | ||
1730 | { | ||
1731 | register unsigned char p = *phase, tmp; | ||
1732 | register int c = *count; | ||
1733 | register unsigned char *d = *data; | ||
1734 | |||
1735 | /* | ||
1736 | * The NCR5380 chip will only drive the SCSI bus when the | ||
1737 | * phase specified in the appropriate bits of the TARGET COMMAND | ||
1738 | * REGISTER match the STATUS REGISTER | ||
1739 | */ | ||
1740 | |||
1741 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | ||
1742 | |||
1743 | do { | ||
1744 | /* | ||
1745 | * Wait for assertion of REQ, after which the phase bits will be | ||
1746 | * valid | ||
1747 | */ | ||
1748 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)); | ||
1749 | |||
1750 | HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO); | ||
1751 | |||
1752 | /* Check for phase mismatch */ | ||
1753 | if ((tmp & PHASE_MASK) != p) { | ||
1754 | PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO); | ||
1755 | NCR_PRINT_PHASE(NDEBUG_PIO); | ||
1756 | break; | ||
1757 | } | ||
1758 | |||
1759 | /* Do actual transfer from SCSI bus to / from memory */ | ||
1760 | if (!(p & SR_IO)) | ||
1761 | NCR5380_write(OUTPUT_DATA_REG, *d); | ||
1762 | else | ||
1763 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | ||
1764 | |||
1765 | ++d; | ||
1766 | |||
1767 | /* | ||
1768 | * The SCSI standard suggests that in MSGOUT phase, the initiator | ||
1769 | * should drop ATN on the last byte of the message phase | ||
1770 | * after REQ has been asserted for the handshake but before | ||
1771 | * the initiator raises ACK. | ||
1772 | */ | ||
1773 | |||
1774 | if (!(p & SR_IO)) { | ||
1775 | if (!((p & SR_MSG) && c > 1)) { | ||
1776 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
1777 | ICR_ASSERT_DATA); | ||
1778 | NCR_PRINT(NDEBUG_PIO); | ||
1779 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
1780 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | ||
1781 | } else { | ||
1782 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
1783 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | ||
1784 | NCR_PRINT(NDEBUG_PIO); | ||
1785 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
1786 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | ||
1787 | } | ||
1788 | } else { | ||
1789 | NCR_PRINT(NDEBUG_PIO); | ||
1790 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | ||
1791 | } | ||
1792 | |||
1793 | while (NCR5380_read(STATUS_REG) & SR_REQ); | ||
1794 | |||
1795 | HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO); | ||
1796 | |||
1797 | /* | ||
1798 | * We have several special cases to consider during REQ/ACK handshaking : | ||
1799 | * 1. We were in MSGOUT phase, and we are on the last byte of the | ||
1800 | * message. ATN must be dropped as ACK is dropped. | ||
1801 | * | ||
1802 | * 2. We are in a MSGIN phase, and we are on the last byte of the | ||
1803 | * message. We must exit with ACK asserted, so that the calling | ||
1804 | * code may raise ATN before dropping ACK to reject the message. | ||
1805 | * | ||
1806 | * 3. ACK and ATN are clear and the target may proceed as normal. | ||
1807 | */ | ||
1808 | if (!(p == PHASE_MSGIN && c == 1)) { | ||
1809 | if (p == PHASE_MSGOUT && c > 1) | ||
1810 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | ||
1811 | else | ||
1812 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
1813 | } | ||
1814 | } while (--c); | ||
1815 | |||
1816 | PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c); | ||
1817 | |||
1818 | *count = c; | ||
1819 | *data = d; | ||
1820 | tmp = NCR5380_read(STATUS_REG); | ||
1821 | /* The phase read from the bus is valid if either REQ is (already) | ||
1822 | * asserted or if ACK hasn't been released yet. The latter is the case if | ||
1823 | * we're in MSGIN and all wanted bytes have been received. */ | ||
1824 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) | ||
1825 | *phase = tmp & PHASE_MASK; | ||
1826 | else | ||
1827 | *phase = PHASE_UNKNOWN; | ||
1828 | |||
1829 | if (!c || (*phase == p)) | ||
1830 | return 0; | ||
1831 | else | ||
1832 | return -1; | ||
1833 | } | ||
1834 | |||
1835 | /* | ||
1836 | * Function : do_abort (Scsi_Host *host) | ||
1837 | * | ||
1838 | * Purpose : abort the currently established nexus. Should only be | ||
1839 | * called from a routine which can drop into a | ||
1840 | * | ||
1841 | * Returns : 0 on success, -1 on failure. | ||
1842 | */ | ||
1843 | |||
1844 | static int do_abort (struct Scsi_Host *host) | ||
1845 | { | ||
1846 | unsigned char tmp, *msgptr, phase; | ||
1847 | int len; | ||
1848 | |||
1849 | /* Request message out phase */ | ||
1850 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | ||
1851 | |||
1852 | /* | ||
1853 | * Wait for the target to indicate a valid phase by asserting | ||
1854 | * REQ. Once this happens, we'll have either a MSGOUT phase | ||
1855 | * and can immediately send the ABORT message, or we'll have some | ||
1856 | * other phase and will have to source/sink data. | ||
1857 | * | ||
1858 | * We really don't care what value was on the bus or what value | ||
1859 | * the target sees, so we just handshake. | ||
1860 | */ | ||
1861 | |||
1862 | while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ); | ||
1863 | |||
1864 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | ||
1865 | |||
1866 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | ||
1867 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | ||
1868 | ICR_ASSERT_ACK); | ||
1869 | while (NCR5380_read(STATUS_REG) & SR_REQ); | ||
1870 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | ||
1871 | } | ||
1872 | |||
1873 | tmp = ABORT; | ||
1874 | msgptr = &tmp; | ||
1875 | len = 1; | ||
1876 | phase = PHASE_MSGOUT; | ||
1877 | NCR5380_transfer_pio (host, &phase, &len, &msgptr); | ||
1878 | |||
1879 | /* | ||
1880 | * If we got here, and the command completed successfully, | ||
1881 | * we're about to go into bus free state. | ||
1882 | */ | ||
1883 | |||
1884 | return len ? -1 : 0; | ||
1885 | } | ||
1886 | |||
1887 | #if defined(REAL_DMA) | ||
1888 | /* | ||
1889 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | ||
1890 | * unsigned char *phase, int *count, unsigned char **data) | ||
1891 | * | ||
1892 | * Purpose : transfers data in given phase using either real | ||
1893 | * or pseudo DMA. | ||
1894 | * | ||
1895 | * Inputs : instance - instance of driver, *phase - pointer to | ||
1896 | * what phase is expected, *count - pointer to number of | ||
1897 | * bytes to transfer, **data - pointer to data pointer. | ||
1898 | * | ||
1899 | * Returns : -1 when different phase is entered without transferring | ||
1900 | * maximum number of bytes, 0 if all bytes or transfered or exit | ||
1901 | * is in same phase. | ||
1902 | * | ||
1903 | * Also, *phase, *count, *data are modified in place. | ||
1904 | * | ||
1905 | */ | ||
1906 | |||
1907 | |||
1908 | static int NCR5380_transfer_dma( struct Scsi_Host *instance, | ||
1909 | unsigned char *phase, int *count, | ||
1910 | unsigned char **data) | ||
1911 | { | ||
1912 | SETUP_HOSTDATA(instance); | ||
1913 | register int c = *count; | ||
1914 | register unsigned char p = *phase; | ||
1915 | register unsigned char *d = *data; | ||
1916 | unsigned char tmp; | ||
1917 | unsigned long flags; | ||
1918 | |||
1919 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | ||
1920 | *phase = tmp; | ||
1921 | return -1; | ||
1922 | } | ||
1923 | |||
1924 | if (atari_read_overruns && (p & SR_IO)) { | ||
1925 | c -= atari_read_overruns; | ||
1926 | } | ||
1927 | |||
1928 | DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n", | ||
1929 | HOSTNO, (p & SR_IO) ? "reading" : "writing", | ||
1930 | c, (p & SR_IO) ? "to" : "from", d); | ||
1931 | |||
1932 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | ||
1933 | |||
1934 | #ifdef REAL_DMA | ||
1935 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); | ||
1936 | #endif /* def REAL_DMA */ | ||
1937 | |||
1938 | if (IS_A_TT()) { | ||
1939 | /* On the Medusa, it is a must to initialize the DMA before | ||
1940 | * starting the NCR. This is also the cleaner way for the TT. | ||
1941 | */ | ||
1942 | local_irq_save(flags); | ||
1943 | hostdata->dma_len = (p & SR_IO) ? | ||
1944 | NCR5380_dma_read_setup(instance, d, c) : | ||
1945 | NCR5380_dma_write_setup(instance, d, c); | ||
1946 | local_irq_restore(flags); | ||
1947 | } | ||
1948 | |||
1949 | if (p & SR_IO) | ||
1950 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | ||
1951 | else { | ||
1952 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | ||
1953 | NCR5380_write(START_DMA_SEND_REG, 0); | ||
1954 | } | ||
1955 | |||
1956 | if (!IS_A_TT()) { | ||
1957 | /* On the Falcon, the DMA setup must be done after the last */ | ||
1958 | /* NCR access, else the DMA setup gets trashed! | ||
1959 | */ | ||
1960 | local_irq_save(flags); | ||
1961 | hostdata->dma_len = (p & SR_IO) ? | ||
1962 | NCR5380_dma_read_setup(instance, d, c) : | ||
1963 | NCR5380_dma_write_setup(instance, d, c); | ||
1964 | local_irq_restore(flags); | ||
1965 | } | ||
1966 | return 0; | ||
1967 | } | ||
1968 | #endif /* defined(REAL_DMA) */ | ||
1969 | |||
1970 | /* | ||
1971 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | ||
1972 | * | ||
1973 | * Purpose : run through the various SCSI phases and do as the target | ||
1974 | * directs us to. Operates on the currently connected command, | ||
1975 | * instance->connected. | ||
1976 | * | ||
1977 | * Inputs : instance, instance for which we are doing commands | ||
1978 | * | ||
1979 | * Side effects : SCSI things happen, the disconnected queue will be | ||
1980 | * modified if a command disconnects, *instance->connected will | ||
1981 | * change. | ||
1982 | * | ||
1983 | * XXX Note : we need to watch for bus free or a reset condition here | ||
1984 | * to recover from an unexpected bus free condition. | ||
1985 | */ | ||
1986 | |||
1987 | static void NCR5380_information_transfer (struct Scsi_Host *instance) | ||
1988 | { | ||
1989 | SETUP_HOSTDATA(instance); | ||
1990 | unsigned long flags; | ||
1991 | unsigned char msgout = NOP; | ||
1992 | int sink = 0; | ||
1993 | int len; | ||
1994 | #if defined(REAL_DMA) | ||
1995 | int transfersize; | ||
1996 | #endif | ||
1997 | unsigned char *data; | ||
1998 | unsigned char phase, tmp, extended_msg[10], old_phase=0xff; | ||
1999 | Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; | ||
2000 | |||
2001 | while (1) { | ||
2002 | tmp = NCR5380_read(STATUS_REG); | ||
2003 | /* We only have a valid SCSI phase when REQ is asserted */ | ||
2004 | if (tmp & SR_REQ) { | ||
2005 | phase = (tmp & PHASE_MASK); | ||
2006 | if (phase != old_phase) { | ||
2007 | old_phase = phase; | ||
2008 | NCR_PRINT_PHASE(NDEBUG_INFORMATION); | ||
2009 | } | ||
2010 | |||
2011 | if (sink && (phase != PHASE_MSGOUT)) { | ||
2012 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | ||
2013 | |||
2014 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | ||
2015 | ICR_ASSERT_ACK); | ||
2016 | while (NCR5380_read(STATUS_REG) & SR_REQ); | ||
2017 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
2018 | ICR_ASSERT_ATN); | ||
2019 | sink = 0; | ||
2020 | continue; | ||
2021 | } | ||
2022 | |||
2023 | switch (phase) { | ||
2024 | case PHASE_DATAOUT: | ||
2025 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | ||
2026 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " | ||
2027 | "aborted\n", HOSTNO); | ||
2028 | sink = 1; | ||
2029 | do_abort(instance); | ||
2030 | cmd->result = DID_ERROR << 16; | ||
2031 | cmd->done(cmd); | ||
2032 | return; | ||
2033 | #endif | ||
2034 | case PHASE_DATAIN: | ||
2035 | /* | ||
2036 | * If there is no room left in the current buffer in the | ||
2037 | * scatter-gather list, move onto the next one. | ||
2038 | */ | ||
2039 | |||
2040 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | ||
2041 | ++cmd->SCp.buffer; | ||
2042 | --cmd->SCp.buffers_residual; | ||
2043 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | ||
2044 | cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ | ||
2045 | cmd->SCp.buffer->offset; | ||
2046 | /* ++roman: Try to merge some scatter-buffers if | ||
2047 | * they are at contiguous physical addresses. | ||
2048 | */ | ||
2049 | merge_contiguous_buffers( cmd ); | ||
2050 | INF_PRINTK("scsi%d: %d bytes and %d buffers left\n", | ||
2051 | HOSTNO, cmd->SCp.this_residual, | ||
2052 | cmd->SCp.buffers_residual); | ||
2053 | } | ||
2054 | |||
2055 | /* | ||
2056 | * The preferred transfer method is going to be | ||
2057 | * PSEUDO-DMA for systems that are strictly PIO, | ||
2058 | * since we can let the hardware do the handshaking. | ||
2059 | * | ||
2060 | * For this to work, we need to know the transfersize | ||
2061 | * ahead of time, since the pseudo-DMA code will sit | ||
2062 | * in an unconditional loop. | ||
2063 | */ | ||
2064 | |||
2065 | /* ++roman: I suggest, this should be | ||
2066 | * #if def(REAL_DMA) | ||
2067 | * instead of leaving REAL_DMA out. | ||
2068 | */ | ||
2069 | |||
2070 | #if defined(REAL_DMA) | ||
2071 | if (!cmd->device->borken && | ||
2072 | (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) { | ||
2073 | len = transfersize; | ||
2074 | cmd->SCp.phase = phase; | ||
2075 | if (NCR5380_transfer_dma(instance, &phase, | ||
2076 | &len, (unsigned char **) &cmd->SCp.ptr)) { | ||
2077 | /* | ||
2078 | * If the watchdog timer fires, all future | ||
2079 | * accesses to this device will use the | ||
2080 | * polled-IO. */ | ||
2081 | printk(KERN_NOTICE "scsi%d: switching target %d " | ||
2082 | "lun %d to slow handshake\n", HOSTNO, | ||
2083 | cmd->device->id, cmd->device->lun); | ||
2084 | cmd->device->borken = 1; | ||
2085 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
2086 | ICR_ASSERT_ATN); | ||
2087 | sink = 1; | ||
2088 | do_abort(instance); | ||
2089 | cmd->result = DID_ERROR << 16; | ||
2090 | cmd->done(cmd); | ||
2091 | /* XXX - need to source or sink data here, as appropriate */ | ||
2092 | } else { | ||
2093 | #ifdef REAL_DMA | ||
2094 | /* ++roman: When using real DMA, | ||
2095 | * information_transfer() should return after | ||
2096 | * starting DMA since it has nothing more to | ||
2097 | * do. | ||
2098 | */ | ||
2099 | return; | ||
2100 | #else | ||
2101 | cmd->SCp.this_residual -= transfersize - len; | ||
2102 | #endif | ||
2103 | } | ||
2104 | } else | ||
2105 | #endif /* defined(REAL_DMA) */ | ||
2106 | NCR5380_transfer_pio(instance, &phase, | ||
2107 | (int *) &cmd->SCp.this_residual, (unsigned char **) | ||
2108 | &cmd->SCp.ptr); | ||
2109 | break; | ||
2110 | case PHASE_MSGIN: | ||
2111 | len = 1; | ||
2112 | data = &tmp; | ||
2113 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | ||
2114 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2115 | cmd->SCp.Message = tmp; | ||
2116 | |||
2117 | switch (tmp) { | ||
2118 | /* | ||
2119 | * Linking lets us reduce the time required to get the | ||
2120 | * next command out to the device, hopefully this will | ||
2121 | * mean we don't waste another revolution due to the delays | ||
2122 | * required by ARBITRATION and another SELECTION. | ||
2123 | * | ||
2124 | * In the current implementation proposal, low level drivers | ||
2125 | * merely have to start the next command, pointed to by | ||
2126 | * next_link, done() is called as with unlinked commands. | ||
2127 | */ | ||
2128 | #ifdef LINKED | ||
2129 | case LINKED_CMD_COMPLETE: | ||
2130 | case LINKED_FLG_CMD_COMPLETE: | ||
2131 | /* Accept message by clearing ACK */ | ||
2132 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2133 | |||
2134 | LNK_PRINTK("scsi%d: target %d lun %d linked command " | ||
2135 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); | ||
2136 | |||
2137 | /* Enable reselect interrupts */ | ||
2138 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2139 | /* | ||
2140 | * Sanity check : A linked command should only terminate | ||
2141 | * with one of these messages if there are more linked | ||
2142 | * commands available. | ||
2143 | */ | ||
2144 | |||
2145 | if (!cmd->next_link) { | ||
2146 | printk(KERN_NOTICE "scsi%d: target %d lun %d " | ||
2147 | "linked command complete, no next_link\n", | ||
2148 | HOSTNO, cmd->device->id, cmd->device->lun); | ||
2149 | sink = 1; | ||
2150 | do_abort (instance); | ||
2151 | return; | ||
2152 | } | ||
2153 | |||
2154 | initialize_SCp(cmd->next_link); | ||
2155 | /* The next command is still part of this process; copy it | ||
2156 | * and don't free it! */ | ||
2157 | cmd->next_link->tag = cmd->tag; | ||
2158 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | ||
2159 | LNK_PRINTK("scsi%d: target %d lun %d linked request " | ||
2160 | "done, calling scsi_done().\n", | ||
2161 | HOSTNO, cmd->device->id, cmd->device->lun); | ||
2162 | #ifdef NCR5380_STATS | ||
2163 | collect_stats(hostdata, cmd); | ||
2164 | #endif | ||
2165 | cmd->scsi_done(cmd); | ||
2166 | cmd = hostdata->connected; | ||
2167 | break; | ||
2168 | #endif /* def LINKED */ | ||
2169 | case ABORT: | ||
2170 | case COMMAND_COMPLETE: | ||
2171 | /* Accept message by clearing ACK */ | ||
2172 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2173 | /* ++guenther: possible race with Falcon locking */ | ||
2174 | falcon_dont_release++; | ||
2175 | hostdata->connected = NULL; | ||
2176 | QU_PRINTK("scsi%d: command for target %d, lun %d " | ||
2177 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); | ||
2178 | #ifdef SUPPORT_TAGS | ||
2179 | cmd_free_tag( cmd ); | ||
2180 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | ||
2181 | /* Turn a QUEUE FULL status into BUSY, I think the | ||
2182 | * mid level cannot handle QUEUE FULL :-( (The | ||
2183 | * command is retried after BUSY). Also update our | ||
2184 | * queue size to the number of currently issued | ||
2185 | * commands now. | ||
2186 | */ | ||
2187 | /* ++Andreas: the mid level code knows about | ||
2188 | QUEUE_FULL now. */ | ||
2189 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | ||
2190 | TAG_PRINTK("scsi%d: target %d lun %d returned " | ||
2191 | "QUEUE_FULL after %d commands\n", | ||
2192 | HOSTNO, cmd->device->id, cmd->device->lun, | ||
2193 | ta->nr_allocated); | ||
2194 | if (ta->queue_size > ta->nr_allocated) | ||
2195 | ta->nr_allocated = ta->queue_size; | ||
2196 | } | ||
2197 | #else | ||
2198 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | ||
2199 | #endif | ||
2200 | /* Enable reselect interrupts */ | ||
2201 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2202 | |||
2203 | /* | ||
2204 | * I'm not sure what the correct thing to do here is : | ||
2205 | * | ||
2206 | * If the command that just executed is NOT a request | ||
2207 | * sense, the obvious thing to do is to set the result | ||
2208 | * code to the values of the stored parameters. | ||
2209 | * | ||
2210 | * If it was a REQUEST SENSE command, we need some way to | ||
2211 | * differentiate between the failure code of the original | ||
2212 | * and the failure code of the REQUEST sense - the obvious | ||
2213 | * case is success, where we fall through and leave the | ||
2214 | * result code unchanged. | ||
2215 | * | ||
2216 | * The non-obvious place is where the REQUEST SENSE failed | ||
2217 | */ | ||
2218 | |||
2219 | if (cmd->cmnd[0] != REQUEST_SENSE) | ||
2220 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | ||
2221 | else if (status_byte(cmd->SCp.Status) != GOOD) | ||
2222 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | ||
2223 | |||
2224 | #ifdef AUTOSENSE | ||
2225 | if ((cmd->cmnd[0] != REQUEST_SENSE) && | ||
2226 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | ||
2227 | ASEN_PRINTK("scsi%d: performing request sense\n", | ||
2228 | HOSTNO); | ||
2229 | cmd->cmnd[0] = REQUEST_SENSE; | ||
2230 | cmd->cmnd[1] &= 0xe0; | ||
2231 | cmd->cmnd[2] = 0; | ||
2232 | cmd->cmnd[3] = 0; | ||
2233 | cmd->cmnd[4] = sizeof(cmd->sense_buffer); | ||
2234 | cmd->cmnd[5] = 0; | ||
2235 | cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]); | ||
2236 | |||
2237 | cmd->use_sg = 0; | ||
2238 | /* this is initialized from initialize_SCp | ||
2239 | cmd->SCp.buffer = NULL; | ||
2240 | cmd->SCp.buffers_residual = 0; | ||
2241 | */ | ||
2242 | cmd->request_buffer = (char *) cmd->sense_buffer; | ||
2243 | cmd->request_bufflen = sizeof(cmd->sense_buffer); | ||
2244 | |||
2245 | local_irq_save(flags); | ||
2246 | LIST(cmd,hostdata->issue_queue); | ||
2247 | NEXT(cmd) = hostdata->issue_queue; | ||
2248 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; | ||
2249 | local_irq_restore(flags); | ||
2250 | QU_PRINTK("scsi%d: REQUEST SENSE added to head of " | ||
2251 | "issue queue\n", H_NO(cmd)); | ||
2252 | } else | ||
2253 | #endif /* def AUTOSENSE */ | ||
2254 | { | ||
2255 | #ifdef NCR5380_STATS | ||
2256 | collect_stats(hostdata, cmd); | ||
2257 | #endif | ||
2258 | cmd->scsi_done(cmd); | ||
2259 | } | ||
2260 | |||
2261 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2262 | /* | ||
2263 | * Restore phase bits to 0 so an interrupted selection, | ||
2264 | * arbitration can resume. | ||
2265 | */ | ||
2266 | NCR5380_write(TARGET_COMMAND_REG, 0); | ||
2267 | |||
2268 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | ||
2269 | barrier(); | ||
2270 | |||
2271 | falcon_dont_release--; | ||
2272 | /* ++roman: For Falcon SCSI, release the lock on the | ||
2273 | * ST-DMA here if no other commands are waiting on the | ||
2274 | * disconnected queue. | ||
2275 | */ | ||
2276 | falcon_release_lock_if_possible( hostdata ); | ||
2277 | return; | ||
2278 | case MESSAGE_REJECT: | ||
2279 | /* Accept message by clearing ACK */ | ||
2280 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2281 | /* Enable reselect interrupts */ | ||
2282 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2283 | switch (hostdata->last_message) { | ||
2284 | case HEAD_OF_QUEUE_TAG: | ||
2285 | case ORDERED_QUEUE_TAG: | ||
2286 | case SIMPLE_QUEUE_TAG: | ||
2287 | /* The target obviously doesn't support tagged | ||
2288 | * queuing, even though it announced this ability in | ||
2289 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | ||
2290 | * clear 'tagged_supported' and lock the LUN, since | ||
2291 | * the command is treated as untagged further on. | ||
2292 | */ | ||
2293 | cmd->device->tagged_supported = 0; | ||
2294 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | ||
2295 | cmd->tag = TAG_NONE; | ||
2296 | TAG_PRINTK("scsi%d: target %d lun %d rejected " | ||
2297 | "QUEUE_TAG message; tagged queuing " | ||
2298 | "disabled\n", | ||
2299 | HOSTNO, cmd->device->id, cmd->device->lun); | ||
2300 | break; | ||
2301 | } | ||
2302 | break; | ||
2303 | case DISCONNECT: | ||
2304 | /* Accept message by clearing ACK */ | ||
2305 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2306 | local_irq_save(flags); | ||
2307 | cmd->device->disconnect = 1; | ||
2308 | LIST(cmd,hostdata->disconnected_queue); | ||
2309 | NEXT(cmd) = hostdata->disconnected_queue; | ||
2310 | hostdata->connected = NULL; | ||
2311 | hostdata->disconnected_queue = cmd; | ||
2312 | local_irq_restore(flags); | ||
2313 | QU_PRINTK("scsi%d: command for target %d lun %d was " | ||
2314 | "moved from connected to the " | ||
2315 | "disconnected_queue\n", HOSTNO, | ||
2316 | cmd->device->id, cmd->device->lun); | ||
2317 | /* | ||
2318 | * Restore phase bits to 0 so an interrupted selection, | ||
2319 | * arbitration can resume. | ||
2320 | */ | ||
2321 | NCR5380_write(TARGET_COMMAND_REG, 0); | ||
2322 | |||
2323 | /* Enable reselect interrupts */ | ||
2324 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2325 | /* Wait for bus free to avoid nasty timeouts */ | ||
2326 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | ||
2327 | barrier(); | ||
2328 | return; | ||
2329 | /* | ||
2330 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | ||
2331 | * operation, in violation of the SCSI spec so we can safely | ||
2332 | * ignore SAVE/RESTORE pointers calls. | ||
2333 | * | ||
2334 | * Unfortunately, some disks violate the SCSI spec and | ||
2335 | * don't issue the required SAVE_POINTERS message before | ||
2336 | * disconnecting, and we have to break spec to remain | ||
2337 | * compatible. | ||
2338 | */ | ||
2339 | case SAVE_POINTERS: | ||
2340 | case RESTORE_POINTERS: | ||
2341 | /* Accept message by clearing ACK */ | ||
2342 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2343 | /* Enable reselect interrupts */ | ||
2344 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2345 | break; | ||
2346 | case EXTENDED_MESSAGE: | ||
2347 | /* | ||
2348 | * Extended messages are sent in the following format : | ||
2349 | * Byte | ||
2350 | * 0 EXTENDED_MESSAGE == 1 | ||
2351 | * 1 length (includes one byte for code, doesn't | ||
2352 | * include first two bytes) | ||
2353 | * 2 code | ||
2354 | * 3..length+1 arguments | ||
2355 | * | ||
2356 | * Start the extended message buffer with the EXTENDED_MESSAGE | ||
2357 | * byte, since print_msg() wants the whole thing. | ||
2358 | */ | ||
2359 | extended_msg[0] = EXTENDED_MESSAGE; | ||
2360 | /* Accept first byte by clearing ACK */ | ||
2361 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2362 | |||
2363 | EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO); | ||
2364 | |||
2365 | len = 2; | ||
2366 | data = extended_msg + 1; | ||
2367 | phase = PHASE_MSGIN; | ||
2368 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2369 | EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO, | ||
2370 | (int)extended_msg[1], (int)extended_msg[2]); | ||
2371 | |||
2372 | if (!len && extended_msg[1] <= | ||
2373 | (sizeof (extended_msg) - 1)) { | ||
2374 | /* Accept third byte by clearing ACK */ | ||
2375 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2376 | len = extended_msg[1] - 1; | ||
2377 | data = extended_msg + 3; | ||
2378 | phase = PHASE_MSGIN; | ||
2379 | |||
2380 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2381 | EXT_PRINTK("scsi%d: message received, residual %d\n", | ||
2382 | HOSTNO, len); | ||
2383 | |||
2384 | switch (extended_msg[2]) { | ||
2385 | case EXTENDED_SDTR: | ||
2386 | case EXTENDED_WDTR: | ||
2387 | case EXTENDED_MODIFY_DATA_POINTER: | ||
2388 | case EXTENDED_EXTENDED_IDENTIFY: | ||
2389 | tmp = 0; | ||
2390 | } | ||
2391 | } else if (len) { | ||
2392 | printk(KERN_NOTICE "scsi%d: error receiving " | ||
2393 | "extended message\n", HOSTNO); | ||
2394 | tmp = 0; | ||
2395 | } else { | ||
2396 | printk(KERN_NOTICE "scsi%d: extended message " | ||
2397 | "code %02x length %d is too long\n", | ||
2398 | HOSTNO, extended_msg[2], extended_msg[1]); | ||
2399 | tmp = 0; | ||
2400 | } | ||
2401 | /* Fall through to reject message */ | ||
2402 | |||
2403 | /* | ||
2404 | * If we get something weird that we aren't expecting, | ||
2405 | * reject it. | ||
2406 | */ | ||
2407 | default: | ||
2408 | if (!tmp) { | ||
2409 | printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); | ||
2410 | print_msg (extended_msg); | ||
2411 | printk("\n"); | ||
2412 | } else if (tmp != EXTENDED_MESSAGE) | ||
2413 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | ||
2414 | "message %02x from target %d, lun %d\n", | ||
2415 | HOSTNO, tmp, cmd->device->id, cmd->device->lun); | ||
2416 | else | ||
2417 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | ||
2418 | "extended message " | ||
2419 | "code %02x, length %d from target %d, lun %d\n", | ||
2420 | HOSTNO, extended_msg[1], extended_msg[0], | ||
2421 | cmd->device->id, cmd->device->lun); | ||
2422 | |||
2423 | |||
2424 | msgout = MESSAGE_REJECT; | ||
2425 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | ||
2426 | ICR_ASSERT_ATN); | ||
2427 | break; | ||
2428 | } /* switch (tmp) */ | ||
2429 | break; | ||
2430 | case PHASE_MSGOUT: | ||
2431 | len = 1; | ||
2432 | data = &msgout; | ||
2433 | hostdata->last_message = msgout; | ||
2434 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2435 | if (msgout == ABORT) { | ||
2436 | #ifdef SUPPORT_TAGS | ||
2437 | cmd_free_tag( cmd ); | ||
2438 | #else | ||
2439 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | ||
2440 | #endif | ||
2441 | hostdata->connected = NULL; | ||
2442 | cmd->result = DID_ERROR << 16; | ||
2443 | #ifdef NCR5380_STATS | ||
2444 | collect_stats(hostdata, cmd); | ||
2445 | #endif | ||
2446 | cmd->scsi_done(cmd); | ||
2447 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | ||
2448 | falcon_release_lock_if_possible( hostdata ); | ||
2449 | return; | ||
2450 | } | ||
2451 | msgout = NOP; | ||
2452 | break; | ||
2453 | case PHASE_CMDOUT: | ||
2454 | len = cmd->cmd_len; | ||
2455 | data = cmd->cmnd; | ||
2456 | /* | ||
2457 | * XXX for performance reasons, on machines with a | ||
2458 | * PSEUDO-DMA architecture we should probably | ||
2459 | * use the dma transfer function. | ||
2460 | */ | ||
2461 | NCR5380_transfer_pio(instance, &phase, &len, | ||
2462 | &data); | ||
2463 | break; | ||
2464 | case PHASE_STATIN: | ||
2465 | len = 1; | ||
2466 | data = &tmp; | ||
2467 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2468 | cmd->SCp.Status = tmp; | ||
2469 | break; | ||
2470 | default: | ||
2471 | printk("scsi%d: unknown phase\n", HOSTNO); | ||
2472 | NCR_PRINT(NDEBUG_ANY); | ||
2473 | } /* switch(phase) */ | ||
2474 | } /* if (tmp * SR_REQ) */ | ||
2475 | } /* while (1) */ | ||
2476 | } | ||
2477 | |||
2478 | /* | ||
2479 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | ||
2480 | * | ||
2481 | * Purpose : does reselection, initializing the instance->connected | ||
2482 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q | ||
2483 | * nexus has been reestablished, | ||
2484 | * | ||
2485 | * Inputs : instance - this instance of the NCR5380. | ||
2486 | * | ||
2487 | */ | ||
2488 | |||
2489 | |||
2490 | static void NCR5380_reselect (struct Scsi_Host *instance) | ||
2491 | { | ||
2492 | SETUP_HOSTDATA(instance); | ||
2493 | unsigned char target_mask; | ||
2494 | unsigned char lun, phase; | ||
2495 | int len; | ||
2496 | #ifdef SUPPORT_TAGS | ||
2497 | unsigned char tag; | ||
2498 | #endif | ||
2499 | unsigned char msg[3]; | ||
2500 | unsigned char *data; | ||
2501 | Scsi_Cmnd *tmp = NULL, *prev; | ||
2502 | /* unsigned long flags; */ | ||
2503 | |||
2504 | /* | ||
2505 | * Disable arbitration, etc. since the host adapter obviously | ||
2506 | * lost, and tell an interrupted NCR5380_select() to restart. | ||
2507 | */ | ||
2508 | |||
2509 | NCR5380_write(MODE_REG, MR_BASE); | ||
2510 | hostdata->restart_select = 1; | ||
2511 | |||
2512 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | ||
2513 | |||
2514 | RSL_PRINTK("scsi%d: reselect\n", HOSTNO); | ||
2515 | |||
2516 | /* | ||
2517 | * At this point, we have detected that our SCSI ID is on the bus, | ||
2518 | * SEL is true and BSY was false for at least one bus settle delay | ||
2519 | * (400 ns). | ||
2520 | * | ||
2521 | * We must assert BSY ourselves, until the target drops the SEL | ||
2522 | * signal. | ||
2523 | */ | ||
2524 | |||
2525 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | ||
2526 | |||
2527 | while (NCR5380_read(STATUS_REG) & SR_SEL); | ||
2528 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2529 | |||
2530 | /* | ||
2531 | * Wait for target to go into MSGIN. | ||
2532 | */ | ||
2533 | |||
2534 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); | ||
2535 | |||
2536 | len = 1; | ||
2537 | data = msg; | ||
2538 | phase = PHASE_MSGIN; | ||
2539 | NCR5380_transfer_pio(instance, &phase, &len, &data); | ||
2540 | |||
2541 | if (!(msg[0] & 0x80)) { | ||
2542 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | ||
2543 | print_msg(msg); | ||
2544 | do_abort(instance); | ||
2545 | return; | ||
2546 | } | ||
2547 | lun = (msg[0] & 0x07); | ||
2548 | |||
2549 | #ifdef SUPPORT_TAGS | ||
2550 | /* If the phase is still MSGIN, the target wants to send some more | ||
2551 | * messages. In case it supports tagged queuing, this is probably a | ||
2552 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | ||
2553 | */ | ||
2554 | tag = TAG_NONE; | ||
2555 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | ||
2556 | /* Accept previous IDENTIFY message by clearing ACK */ | ||
2557 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); | ||
2558 | len = 2; | ||
2559 | data = msg+1; | ||
2560 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | ||
2561 | msg[1] == SIMPLE_QUEUE_TAG) | ||
2562 | tag = msg[2]; | ||
2563 | TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at " | ||
2564 | "reselection\n", HOSTNO, target_mask, lun, tag); | ||
2565 | } | ||
2566 | #endif | ||
2567 | |||
2568 | /* | ||
2569 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | ||
2570 | * just reestablished, and remove it from the disconnected queue. | ||
2571 | */ | ||
2572 | |||
2573 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; | ||
2574 | tmp; prev = tmp, tmp = NEXT(tmp) ) { | ||
2575 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | ||
2576 | #ifdef SUPPORT_TAGS | ||
2577 | && (tag == tmp->tag) | ||
2578 | #endif | ||
2579 | ) { | ||
2580 | /* ++guenther: prevent race with falcon_release_lock */ | ||
2581 | falcon_dont_release++; | ||
2582 | if (prev) { | ||
2583 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | ||
2584 | NEXT(prev) = NEXT(tmp); | ||
2585 | } else { | ||
2586 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | ||
2587 | hostdata->disconnected_queue = NEXT(tmp); | ||
2588 | } | ||
2589 | NEXT(tmp) = NULL; | ||
2590 | break; | ||
2591 | } | ||
2592 | } | ||
2593 | |||
2594 | if (!tmp) { | ||
2595 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | ||
2596 | #ifdef SUPPORT_TAGS | ||
2597 | "tag %d " | ||
2598 | #endif | ||
2599 | "not in disconnected_queue.\n", | ||
2600 | HOSTNO, target_mask, lun | ||
2601 | #ifdef SUPPORT_TAGS | ||
2602 | , tag | ||
2603 | #endif | ||
2604 | ); | ||
2605 | /* | ||
2606 | * Since we have an established nexus that we can't do anything | ||
2607 | * with, we must abort it. | ||
2608 | */ | ||
2609 | do_abort(instance); | ||
2610 | return; | ||
2611 | } | ||
2612 | |||
2613 | /* Accept message by clearing ACK */ | ||
2614 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | ||
2615 | |||
2616 | hostdata->connected = tmp; | ||
2617 | RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", | ||
2618 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); | ||
2619 | falcon_dont_release--; | ||
2620 | } | ||
2621 | |||
2622 | |||
2623 | /* | ||
2624 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) | ||
2625 | * | ||
2626 | * Purpose : abort a command | ||
2627 | * | ||
2628 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the | ||
2629 | * host byte of the result field to, if zero DID_ABORTED is | ||
2630 | * used. | ||
2631 | * | ||
2632 | * Returns : 0 - success, -1 on failure. | ||
2633 | * | ||
2634 | * XXX - there is no way to abort the command that is currently | ||
2635 | * connected, you have to wait for it to complete. If this is | ||
2636 | * a problem, we could implement longjmp() / setjmp(), setjmp() | ||
2637 | * called where the loop started in NCR5380_main(). | ||
2638 | */ | ||
2639 | |||
2640 | static | ||
2641 | int NCR5380_abort (Scsi_Cmnd *cmd) | ||
2642 | { | ||
2643 | struct Scsi_Host *instance = cmd->device->host; | ||
2644 | SETUP_HOSTDATA(instance); | ||
2645 | Scsi_Cmnd *tmp, **prev; | ||
2646 | unsigned long flags; | ||
2647 | |||
2648 | printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); | ||
2649 | print_Scsi_Cmnd (cmd); | ||
2650 | |||
2651 | NCR5380_print_status (instance); | ||
2652 | |||
2653 | local_irq_save(flags); | ||
2654 | |||
2655 | if (!IS_A_TT() && !falcon_got_lock) | ||
2656 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n", | ||
2657 | HOSTNO); | ||
2658 | |||
2659 | ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, | ||
2660 | NCR5380_read(BUS_AND_STATUS_REG), | ||
2661 | NCR5380_read(STATUS_REG)); | ||
2662 | |||
2663 | #if 1 | ||
2664 | /* | ||
2665 | * Case 1 : If the command is the currently executing command, | ||
2666 | * we'll set the aborted flag and return control so that | ||
2667 | * information transfer routine can exit cleanly. | ||
2668 | */ | ||
2669 | |||
2670 | if (hostdata->connected == cmd) { | ||
2671 | |||
2672 | ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO); | ||
2673 | /* | ||
2674 | * We should perform BSY checking, and make sure we haven't slipped | ||
2675 | * into BUS FREE. | ||
2676 | */ | ||
2677 | |||
2678 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ | ||
2679 | /* | ||
2680 | * Since we can't change phases until we've completed the current | ||
2681 | * handshake, we have to source or sink a byte of data if the current | ||
2682 | * phase is not MSGOUT. | ||
2683 | */ | ||
2684 | |||
2685 | /* | ||
2686 | * Return control to the executing NCR drive so we can clear the | ||
2687 | * aborted flag and get back into our main loop. | ||
2688 | */ | ||
2689 | |||
2690 | if (do_abort(instance) == 0) { | ||
2691 | hostdata->aborted = 1; | ||
2692 | hostdata->connected = NULL; | ||
2693 | cmd->result = DID_ABORT << 16; | ||
2694 | #ifdef SUPPORT_TAGS | ||
2695 | cmd_free_tag( cmd ); | ||
2696 | #else | ||
2697 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | ||
2698 | #endif | ||
2699 | local_irq_restore(flags); | ||
2700 | cmd->scsi_done(cmd); | ||
2701 | falcon_release_lock_if_possible( hostdata ); | ||
2702 | return SCSI_ABORT_SUCCESS; | ||
2703 | } else { | ||
2704 | /* local_irq_restore(flags); */ | ||
2705 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); | ||
2706 | return SCSI_ABORT_ERROR; | ||
2707 | } | ||
2708 | } | ||
2709 | #endif | ||
2710 | |||
2711 | /* | ||
2712 | * Case 2 : If the command hasn't been issued yet, we simply remove it | ||
2713 | * from the issue queue. | ||
2714 | */ | ||
2715 | for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue), | ||
2716 | tmp = (Scsi_Cmnd *) hostdata->issue_queue; | ||
2717 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) | ||
2718 | if (cmd == tmp) { | ||
2719 | REMOVE(5, *prev, tmp, NEXT(tmp)); | ||
2720 | (*prev) = NEXT(tmp); | ||
2721 | NEXT(tmp) = NULL; | ||
2722 | tmp->result = DID_ABORT << 16; | ||
2723 | local_irq_restore(flags); | ||
2724 | ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n", | ||
2725 | HOSTNO); | ||
2726 | /* Tagged queuing note: no tag to free here, hasn't been assigned | ||
2727 | * yet... */ | ||
2728 | tmp->scsi_done(tmp); | ||
2729 | falcon_release_lock_if_possible( hostdata ); | ||
2730 | return SCSI_ABORT_SUCCESS; | ||
2731 | } | ||
2732 | |||
2733 | /* | ||
2734 | * Case 3 : If any commands are connected, we're going to fail the abort | ||
2735 | * and let the high level SCSI driver retry at a later time or | ||
2736 | * issue a reset. | ||
2737 | * | ||
2738 | * Timeouts, and therefore aborted commands, will be highly unlikely | ||
2739 | * and handling them cleanly in this situation would make the common | ||
2740 | * case of noresets less efficient, and would pollute our code. So, | ||
2741 | * we fail. | ||
2742 | */ | ||
2743 | |||
2744 | if (hostdata->connected) { | ||
2745 | local_irq_restore(flags); | ||
2746 | ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO); | ||
2747 | return SCSI_ABORT_SNOOZE; | ||
2748 | } | ||
2749 | |||
2750 | /* | ||
2751 | * Case 4: If the command is currently disconnected from the bus, and | ||
2752 | * there are no connected commands, we reconnect the I_T_L or | ||
2753 | * I_T_L_Q nexus associated with it, go into message out, and send | ||
2754 | * an abort message. | ||
2755 | * | ||
2756 | * This case is especially ugly. In order to reestablish the nexus, we | ||
2757 | * need to call NCR5380_select(). The easiest way to implement this | ||
2758 | * function was to abort if the bus was busy, and let the interrupt | ||
2759 | * handler triggered on the SEL for reselect take care of lost arbitrations | ||
2760 | * where necessary, meaning interrupts need to be enabled. | ||
2761 | * | ||
2762 | * When interrupts are enabled, the queues may change - so we | ||
2763 | * can't remove it from the disconnected queue before selecting it | ||
2764 | * because that could cause a failure in hashing the nexus if that | ||
2765 | * device reselected. | ||
2766 | * | ||
2767 | * Since the queues may change, we can't use the pointers from when we | ||
2768 | * first locate it. | ||
2769 | * | ||
2770 | * So, we must first locate the command, and if NCR5380_select() | ||
2771 | * succeeds, then issue the abort, relocate the command and remove | ||
2772 | * it from the disconnected queue. | ||
2773 | */ | ||
2774 | |||
2775 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; | ||
2776 | tmp = NEXT(tmp)) | ||
2777 | if (cmd == tmp) { | ||
2778 | local_irq_restore(flags); | ||
2779 | ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO); | ||
2780 | |||
2781 | if (NCR5380_select (instance, cmd, (int) cmd->tag)) | ||
2782 | return SCSI_ABORT_BUSY; | ||
2783 | |||
2784 | ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO); | ||
2785 | |||
2786 | do_abort (instance); | ||
2787 | |||
2788 | local_irq_save(flags); | ||
2789 | for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue), | ||
2790 | tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; | ||
2791 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) | ||
2792 | if (cmd == tmp) { | ||
2793 | REMOVE(5, *prev, tmp, NEXT(tmp)); | ||
2794 | *prev = NEXT(tmp); | ||
2795 | NEXT(tmp) = NULL; | ||
2796 | tmp->result = DID_ABORT << 16; | ||
2797 | /* We must unlock the tag/LUN immediately here, since the | ||
2798 | * target goes to BUS FREE and doesn't send us another | ||
2799 | * message (COMMAND_COMPLETE or the like) | ||
2800 | */ | ||
2801 | #ifdef SUPPORT_TAGS | ||
2802 | cmd_free_tag( tmp ); | ||
2803 | #else | ||
2804 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | ||
2805 | #endif | ||
2806 | local_irq_restore(flags); | ||
2807 | tmp->scsi_done(tmp); | ||
2808 | falcon_release_lock_if_possible( hostdata ); | ||
2809 | return SCSI_ABORT_SUCCESS; | ||
2810 | } | ||
2811 | } | ||
2812 | |||
2813 | /* | ||
2814 | * Case 5 : If we reached this point, the command was not found in any of | ||
2815 | * the queues. | ||
2816 | * | ||
2817 | * We probably reached this point because of an unlikely race condition | ||
2818 | * between the command completing successfully and the abortion code, | ||
2819 | * so we won't panic, but we will notify the user in case something really | ||
2820 | * broke. | ||
2821 | */ | ||
2822 | |||
2823 | local_irq_restore(flags); | ||
2824 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n" | ||
2825 | KERN_INFO " before abortion\n", HOSTNO); | ||
2826 | |||
2827 | /* Maybe it is sufficient just to release the ST-DMA lock... (if | ||
2828 | * possible at all) At least, we should check if the lock could be | ||
2829 | * released after the abort, in case it is kept due to some bug. | ||
2830 | */ | ||
2831 | falcon_release_lock_if_possible( hostdata ); | ||
2832 | |||
2833 | return SCSI_ABORT_NOT_RUNNING; | ||
2834 | } | ||
2835 | |||
2836 | |||
2837 | /* | ||
2838 | * Function : int NCR5380_reset (Scsi_Cmnd *cmd) | ||
2839 | * | ||
2840 | * Purpose : reset the SCSI bus. | ||
2841 | * | ||
2842 | * Returns : SCSI_RESET_WAKEUP | ||
2843 | * | ||
2844 | */ | ||
2845 | |||
2846 | static int NCR5380_bus_reset( Scsi_Cmnd *cmd) | ||
2847 | { | ||
2848 | SETUP_HOSTDATA(cmd->device->host); | ||
2849 | int i; | ||
2850 | unsigned long flags; | ||
2851 | #if 1 | ||
2852 | Scsi_Cmnd *connected, *disconnected_queue; | ||
2853 | #endif | ||
2854 | |||
2855 | if (!IS_A_TT() && !falcon_got_lock) | ||
2856 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n", | ||
2857 | H_NO(cmd) ); | ||
2858 | |||
2859 | NCR5380_print_status (cmd->device->host); | ||
2860 | |||
2861 | /* get in phase */ | ||
2862 | NCR5380_write( TARGET_COMMAND_REG, | ||
2863 | PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); | ||
2864 | /* assert RST */ | ||
2865 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); | ||
2866 | udelay (40); | ||
2867 | /* reset NCR registers */ | ||
2868 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); | ||
2869 | NCR5380_write( MODE_REG, MR_BASE ); | ||
2870 | NCR5380_write( TARGET_COMMAND_REG, 0 ); | ||
2871 | NCR5380_write( SELECT_ENABLE_REG, 0 ); | ||
2872 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get | ||
2873 | * through anymore ... */ | ||
2874 | (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG ); | ||
2875 | |||
2876 | #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */ | ||
2877 | /* XXX see below XXX */ | ||
2878 | |||
2879 | /* MSch: old-style reset: actually abort all command processing here */ | ||
2880 | |||
2881 | /* After the reset, there are no more connected or disconnected commands | ||
2882 | * and no busy units; to avoid problems with re-inserting the commands | ||
2883 | * into the issue_queue (via scsi_done()), the aborted commands are | ||
2884 | * remembered in local variables first. | ||
2885 | */ | ||
2886 | local_irq_save(flags); | ||
2887 | connected = (Scsi_Cmnd *)hostdata->connected; | ||
2888 | hostdata->connected = NULL; | ||
2889 | disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue; | ||
2890 | hostdata->disconnected_queue = NULL; | ||
2891 | #ifdef SUPPORT_TAGS | ||
2892 | free_all_tags(); | ||
2893 | #endif | ||
2894 | for( i = 0; i < 8; ++i ) | ||
2895 | hostdata->busy[i] = 0; | ||
2896 | #ifdef REAL_DMA | ||
2897 | hostdata->dma_len = 0; | ||
2898 | #endif | ||
2899 | local_irq_restore(flags); | ||
2900 | |||
2901 | /* In order to tell the mid-level code which commands were aborted, | ||
2902 | * set the command status to DID_RESET and call scsi_done() !!! | ||
2903 | * This ultimately aborts processing of these commands in the mid-level. | ||
2904 | */ | ||
2905 | |||
2906 | if ((cmd = connected)) { | ||
2907 | ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); | ||
2908 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); | ||
2909 | cmd->scsi_done( cmd ); | ||
2910 | } | ||
2911 | |||
2912 | for (i = 0; (cmd = disconnected_queue); ++i) { | ||
2913 | disconnected_queue = NEXT(cmd); | ||
2914 | NEXT(cmd) = NULL; | ||
2915 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); | ||
2916 | cmd->scsi_done( cmd ); | ||
2917 | } | ||
2918 | if (i > 0) | ||
2919 | ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i); | ||
2920 | |||
2921 | /* The Falcon lock should be released after a reset... | ||
2922 | */ | ||
2923 | /* ++guenther: moved to atari_scsi_reset(), to prevent a race between | ||
2924 | * unlocking and enabling dma interrupt. | ||
2925 | */ | ||
2926 | /* falcon_release_lock_if_possible( hostdata );*/ | ||
2927 | |||
2928 | /* since all commands have been explicitly terminated, we need to tell | ||
2929 | * the midlevel code that the reset was SUCCESSFUL, and there is no | ||
2930 | * need to 'wake up' the commands by a request_sense | ||
2931 | */ | ||
2932 | return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET; | ||
2933 | #else /* 1 */ | ||
2934 | |||
2935 | /* MSch: new-style reset handling: let the mid-level do what it can */ | ||
2936 | |||
2937 | /* ++guenther: MID-LEVEL IS STILL BROKEN. | ||
2938 | * Mid-level is supposed to requeue all commands that were active on the | ||
2939 | * various low-level queues. In fact it does this, but that's not enough | ||
2940 | * because all these commands are subject to timeout. And if a timeout | ||
2941 | * happens for any removed command, *_abort() is called but all queues | ||
2942 | * are now empty. Abort then gives up the falcon lock, which is fatal, | ||
2943 | * since the mid-level will queue more commands and must have the lock | ||
2944 | * (it's all happening inside timer interrupt handler!!). | ||
2945 | * Even worse, abort will return NOT_RUNNING for all those commands not | ||
2946 | * on any queue, so they won't be retried ... | ||
2947 | * | ||
2948 | * Conclusion: either scsi.c disables timeout for all resetted commands | ||
2949 | * immediately, or we lose! As of linux-2.0.20 it doesn't. | ||
2950 | */ | ||
2951 | |||
2952 | /* After the reset, there are no more connected or disconnected commands | ||
2953 | * and no busy units; so clear the low-level status here to avoid | ||
2954 | * conflicts when the mid-level code tries to wake up the affected | ||
2955 | * commands! | ||
2956 | */ | ||
2957 | |||
2958 | if (hostdata->issue_queue) | ||
2959 | ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); | ||
2960 | if (hostdata->connected) | ||
2961 | ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); | ||
2962 | if (hostdata->disconnected_queue) | ||
2963 | ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); | ||
2964 | |||
2965 | local_irq_save(flags); | ||
2966 | hostdata->issue_queue = NULL; | ||
2967 | hostdata->connected = NULL; | ||
2968 | hostdata->disconnected_queue = NULL; | ||
2969 | #ifdef SUPPORT_TAGS | ||
2970 | free_all_tags(); | ||
2971 | #endif | ||
2972 | for( i = 0; i < 8; ++i ) | ||
2973 | hostdata->busy[i] = 0; | ||
2974 | #ifdef REAL_DMA | ||
2975 | hostdata->dma_len = 0; | ||
2976 | #endif | ||
2977 | local_irq_restore(flags); | ||
2978 | |||
2979 | /* we did no complete reset of all commands, so a wakeup is required */ | ||
2980 | return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET; | ||
2981 | #endif /* 1 */ | ||
2982 | } | ||
2983 | |||
2984 | /* Local Variables: */ | ||
2985 | /* tab-width: 8 */ | ||
2986 | /* End: */ | ||