Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by |
2 | Sam Creasey. */ | |
3 | /* | |
4 | * NCR 5380 generic driver routines. These should make it *trivial* | |
5 | * to implement 5380 SCSI drivers under Linux with a non-trantor | |
6 | * architecture. | |
7 | * | |
8 | * Note that these routines also work with NR53c400 family chips. | |
9 | * | |
10 | * Copyright 1993, Drew Eckhardt | |
11 | * Visionary Computing | |
12 | * (Unix and Linux consulting and custom programming) | |
13 | * drew@colorado.edu | |
14 | * +1 (303) 666-5836 | |
15 | * | |
16 | * DISTRIBUTION RELEASE 6. | |
17 | * | |
18 | * For more information, please consult | |
19 | * | |
20 | * NCR 5380 Family | |
21 | * SCSI Protocol Controller | |
22 | * Databook | |
23 | * | |
24 | * NCR Microelectronics | |
25 | * 1635 Aeroplaza Drive | |
26 | * Colorado Springs, CO 80916 | |
27 | * 1+ (719) 578-3400 | |
28 | * 1+ (800) 334-5454 | |
29 | */ | |
30 | ||
31 | /* | |
32 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
33 | * this file, too: | |
34 | * | |
35 | * - Some of the debug statements were incorrect (undefined variables and the | |
36 | * like). I fixed that. | |
37 | * | |
38 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
39 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
40 | * in the #if statement. | |
41 | * | |
42 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
43 | * phase after starting the DMA. It has nothing more to do. | |
44 | * | |
45 | * - The interrupt service routine should run main after end of DMA, too (not | |
46 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
47 | * for more interrupts after running main, since a DMA process may have | |
48 | * been started and interrupts are turned on now. The new int could happen | |
49 | * inside the execution of NCR5380_intr(), leading to recursive | |
50 | * calls. | |
51 | * | |
1da177e4 LT |
52 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA |
53 | * and USLEEP, because these were messing up readability and will never be | |
54 | * needed for Atari SCSI. | |
55 | * | |
56 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' | |
57 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
58 | * interrupt. | |
59 | * | |
60 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
61 | * constructs. In my eyes, this made the source rather unreadable, so I | |
62 | * finally replaced that by the *_PRINTK() macros. | |
63 | * | |
64 | */ | |
db9dff36 | 65 | #include <scsi/scsi_dbg.h> |
1abfd370 | 66 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
67 | |
68 | /* | |
69 | * Further development / testing that should be done : | |
70 | * 1. Test linked command handling code after Eric is ready with | |
71 | * the high level code. | |
72 | */ | |
73 | ||
74 | #if (NDEBUG & NDEBUG_LISTS) | |
75 | #define LIST(x,y) \ | |
76 | { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \ | |
77 | if ((x)==(y)) udelay(5); } | |
78 | #define REMOVE(w,x,y,z) \ | |
79 | { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \ | |
80 | (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \ | |
81 | if ((x)==(y)) udelay(5); } | |
82 | #else | |
83 | #define LIST(x,y) | |
84 | #define REMOVE(w,x,y,z) | |
85 | #endif | |
86 | ||
87 | #ifndef notyet | |
88 | #undef LINKED | |
89 | #endif | |
90 | ||
91 | /* | |
92 | * Design | |
93 | * Issues : | |
94 | * | |
95 | * The other Linux SCSI drivers were written when Linux was Intel PC-only, | |
96 | * and specifically for each board rather than each chip. This makes their | |
97 | * adaptation to platforms like the Mac (Some of which use NCR5380's) | |
98 | * more difficult than it has to be. | |
99 | * | |
100 | * Also, many of the SCSI drivers were written before the command queuing | |
101 | * routines were implemented, meaning their implementations of queued | |
102 | * commands were hacked on rather than designed in from the start. | |
103 | * | |
104 | * When I designed the Linux SCSI drivers I figured that | |
105 | * while having two different SCSI boards in a system might be useful | |
106 | * for debugging things, two of the same type wouldn't be used. | |
107 | * Well, I was wrong and a number of users have mailed me about running | |
108 | * multiple high-performance SCSI boards in a server. | |
109 | * | |
110 | * Finally, when I get questions from users, I have no idea what | |
111 | * revision of my driver they are running. | |
112 | * | |
113 | * This driver attempts to address these problems : | |
114 | * This is a generic 5380 driver. To use it on a different platform, | |
115 | * one simply writes appropriate system specific macros (ie, data | |
116 | * transfer - some PC's will use the I/O bus, 68K's must use | |
117 | * memory mapped) and drops this file in their 'C' wrapper. | |
118 | * | |
119 | * As far as command queueing, two queues are maintained for | |
120 | * each 5380 in the system - commands that haven't been issued yet, | |
121 | * and commands that are currently executing. This means that an | |
122 | * unlimited number of commands may be queued, letting | |
123 | * more commands propagate from the higher driver levels giving higher | |
124 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
125 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
126 | * while a command is already executing. | |
127 | * | |
128 | * To solve the multiple-boards-in-the-same-system problem, | |
129 | * there is a separate instance structure for each instance | |
130 | * of a 5380 in the system. So, multiple NCR5380 drivers will | |
131 | * be able to coexist with appropriate changes to the high level | |
132 | * SCSI code. | |
133 | * | |
134 | * A NCR5380_PUBLIC_REVISION macro is provided, with the release | |
135 | * number (updated for each public release) printed by the | |
136 | * NCR5380_print_options command, which should be called from the | |
137 | * wrapper detect function, so that I know what release of the driver | |
138 | * users are using. | |
139 | * | |
140 | * Issues specific to the NCR5380 : | |
141 | * | |
142 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead | |
143 | * piece of hardware that requires you to sit in a loop polling for | |
144 | * the REQ signal as long as you are connected. Some devices are | |
145 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
146 | * while doing long seek operations. | |
147 | * | |
148 | * The workaround for this is to keep track of devices that have | |
149 | * disconnected. If the device hasn't disconnected, for commands that | |
150 | * should disconnect, we do something like | |
151 | * | |
152 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
153 | * | |
154 | * Some tweaking of N and M needs to be done. An algorithm based | |
155 | * on "time to data" would give the best results as long as short time | |
156 | * to datas (ie, on the same track) were considered, however these | |
157 | * broken devices are the exception rather than the rule and I'd rather | |
158 | * spend my time optimizing for the normal case. | |
159 | * | |
160 | * Architecture : | |
161 | * | |
162 | * At the heart of the design is a coroutine, NCR5380_main, | |
163 | * which is started when not running by the interrupt handler, | |
164 | * timer, and queue command function. It attempts to establish | |
165 | * I_T_L or I_T_L_Q nexuses by removing the commands from the | |
166 | * issue queue and calling NCR5380_select() if a nexus | |
167 | * is not established. | |
168 | * | |
169 | * Once a nexus is established, the NCR5380_information_transfer() | |
170 | * phase goes through the various phases as instructed by the target. | |
171 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
172 | * the command structure is placed into the per instance disconnected | |
173 | * queue, and NCR5380_main tries to find more work. If USLEEP | |
174 | * was defined, and the target is idle for too long, the system | |
175 | * will try to sleep. | |
176 | * | |
177 | * If a command has disconnected, eventually an interrupt will trigger, | |
178 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
179 | * to reestablish a nexus. This will run main if necessary. | |
180 | * | |
181 | * On command termination, the done function will be called as | |
182 | * appropriate. | |
183 | * | |
184 | * SCSI pointers are maintained in the SCp field of SCSI command | |
185 | * structures, being initialized after the command is connected | |
186 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
187 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
188 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
189 | */ | |
190 | ||
191 | /* | |
192 | * Using this file : | |
193 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
194 | * of chips. To use it, you write an architecture specific functions | |
195 | * and macros and include this file in your driver. | |
196 | * | |
197 | * These macros control options : | |
198 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically | |
199 | * for commands that return with a CHECK CONDITION status. | |
200 | * | |
201 | * LINKED - if defined, linked commands are supported. | |
202 | * | |
203 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
204 | * | |
205 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
206 | * | |
207 | * These macros MUST be defined : | |
208 | * | |
209 | * NCR5380_read(register) - read from the specified register | |
210 | * | |
211 | * NCR5380_write(register, value) - write to the specific register | |
212 | * | |
213 | * Either real DMA *or* pseudo DMA may be implemented | |
214 | * REAL functions : | |
215 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. | |
216 | * Note that the DMA setup functions should return the number of bytes | |
217 | * that they were able to program the controller for. | |
218 | * | |
219 | * Also note that generic i386/PC versions of these macros are | |
220 | * available as NCR5380_i386_dma_write_setup, | |
221 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
222 | * | |
223 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
224 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
225 | * NCR5380_dma_residual(instance); - residual count | |
226 | * | |
227 | * PSEUDO functions : | |
228 | * NCR5380_pwrite(instance, src, count) | |
229 | * NCR5380_pread(instance, dst, count); | |
230 | * | |
231 | * If nothing specific to this implementation needs doing (ie, with external | |
232 | * hardware), you must also define | |
233 | * | |
234 | * NCR5380_queue_command | |
235 | * NCR5380_reset | |
236 | * NCR5380_abort | |
237 | * NCR5380_proc_info | |
238 | * | |
239 | * to be the global entry points into the specific driver, ie | |
240 | * #define NCR5380_queue_command t128_queue_command. | |
241 | * | |
242 | * If this is not done, the routines will be defined as static functions | |
243 | * with the NCR5380* names and the user must provide a globally | |
244 | * accessible wrapper function. | |
245 | * | |
246 | * The generic driver is initialized by calling NCR5380_init(instance), | |
247 | * after setting the appropriate host specific fields and ID. If the | |
248 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, | |
249 | * possible) function may be used. Before the specific driver initialization | |
250 | * code finishes, NCR5380_print_options should be called. | |
251 | */ | |
252 | ||
253 | static struct Scsi_Host *first_instance = NULL; | |
d0be4a7d | 254 | static struct scsi_host_template *the_template = NULL; |
1da177e4 LT |
255 | |
256 | /* Macros ease life... :-) */ | |
257 | #define SETUP_HOSTDATA(in) \ | |
258 | struct NCR5380_hostdata *hostdata = \ | |
259 | (struct NCR5380_hostdata *)(in)->hostdata | |
260 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
261 | ||
a5cb67f7 GU |
262 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
263 | #define SET_NEXT(cmd, next) ((cmd)->host_scribble = (void *)(next)) | |
264 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble)) | |
1da177e4 LT |
265 | |
266 | #define HOSTNO instance->host_no | |
267 | #define H_NO(cmd) (cmd)->device->host->host_no | |
268 | ||
45711f1a | 269 | #define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer))))) |
1da177e4 LT |
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 | /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */ | |
313 | #if (MAX_TAGS % 32) != 0 | |
314 | #error "MAX_TAGS must be a multiple of 32!" | |
315 | #endif | |
316 | ||
317 | typedef struct { | |
318 | char allocated[MAX_TAGS/8]; | |
319 | int nr_allocated; | |
320 | int queue_size; | |
321 | } TAG_ALLOC; | |
322 | ||
323 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ | |
324 | ||
325 | ||
326 | static void __init init_tags( void ) | |
327 | { | |
328 | int target, lun; | |
329 | TAG_ALLOC *ta; | |
330 | ||
331 | if (!setup_use_tagged_queuing) | |
332 | return; | |
333 | ||
334 | for( target = 0; target < 8; ++target ) { | |
335 | for( lun = 0; lun < 8; ++lun ) { | |
336 | ta = &TagAlloc[target][lun]; | |
337 | memset( &ta->allocated, 0, MAX_TAGS/8 ); | |
338 | ta->nr_allocated = 0; | |
339 | /* At the beginning, assume the maximum queue size we could | |
340 | * support (MAX_TAGS). This value will be decreased if the target | |
341 | * returns QUEUE_FULL status. | |
342 | */ | |
343 | ta->queue_size = MAX_TAGS; | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
348 | ||
349 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
350 | * busy by an untagged command. If the command should use tagged queuing, also | |
351 | * check that there is a free tag and the target's queue won't overflow. This | |
352 | * function should be called with interrupts disabled to avoid race | |
353 | * conditions. | |
354 | */ | |
355 | ||
811c9366 | 356 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 LT |
357 | { |
358 | SETUP_HOSTDATA(cmd->device->host); | |
359 | ||
360 | if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) | |
361 | return( 1 ); | |
362 | if (!should_be_tagged || | |
363 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) | |
364 | return( 0 ); | |
365 | if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= | |
366 | TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) { | |
d65e634a | 367 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
1da177e4 LT |
368 | H_NO(cmd), cmd->device->id, cmd->device->lun ); |
369 | return( 1 ); | |
370 | } | |
371 | return( 0 ); | |
372 | } | |
373 | ||
374 | ||
375 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
376 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
377 | * untagged. | |
378 | */ | |
379 | ||
811c9366 | 380 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 LT |
381 | { |
382 | SETUP_HOSTDATA(cmd->device->host); | |
383 | ||
384 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
385 | * an untagged command. | |
386 | */ | |
387 | if (!should_be_tagged || | |
388 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) { | |
389 | cmd->tag = TAG_NONE; | |
390 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
d65e634a | 391 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
1da177e4 LT |
392 | "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); |
393 | } | |
394 | else { | |
395 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
396 | ||
397 | cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS ); | |
398 | set_bit( cmd->tag, &ta->allocated ); | |
399 | ta->nr_allocated++; | |
d65e634a | 400 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
1da177e4 LT |
401 | "(now %d tags in use)\n", |
402 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun, | |
403 | ta->nr_allocated ); | |
404 | } | |
405 | } | |
406 | ||
407 | ||
408 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
409 | * unlock the LUN. | |
410 | */ | |
411 | ||
811c9366 | 412 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 LT |
413 | { |
414 | SETUP_HOSTDATA(cmd->device->host); | |
415 | ||
416 | if (cmd->tag == TAG_NONE) { | |
417 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
d65e634a | 418 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
1da177e4 LT |
419 | H_NO(cmd), cmd->device->id, cmd->device->lun ); |
420 | } | |
421 | else if (cmd->tag >= MAX_TAGS) { | |
422 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
423 | H_NO(cmd), cmd->tag ); | |
424 | } | |
425 | else { | |
426 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
427 | clear_bit( cmd->tag, &ta->allocated ); | |
428 | ta->nr_allocated--; | |
d65e634a | 429 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
1da177e4 LT |
430 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun ); |
431 | } | |
432 | } | |
433 | ||
434 | ||
435 | static void free_all_tags( void ) | |
436 | { | |
437 | int target, lun; | |
438 | TAG_ALLOC *ta; | |
439 | ||
440 | if (!setup_use_tagged_queuing) | |
441 | return; | |
442 | ||
443 | for( target = 0; target < 8; ++target ) { | |
444 | for( lun = 0; lun < 8; ++lun ) { | |
445 | ta = &TagAlloc[target][lun]; | |
446 | memset( &ta->allocated, 0, MAX_TAGS/8 ); | |
447 | ta->nr_allocated = 0; | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
452 | #endif /* SUPPORT_TAGS */ | |
453 | ||
454 | ||
1da177e4 | 455 | /* |
811c9366 | 456 | * Function : void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 LT |
457 | * |
458 | * Purpose : initialize the saved data pointers for cmd to point to the | |
459 | * start of the buffer. | |
460 | * | |
811c9366 | 461 | * Inputs : cmd - struct scsi_cmnd structure to have pointers reset. |
1da177e4 LT |
462 | */ |
463 | ||
811c9366 | 464 | static __inline__ void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 LT |
465 | { |
466 | /* | |
467 | * Initialize the Scsi Pointer field so that all of the commands in the | |
468 | * various queues are valid. | |
469 | */ | |
470 | ||
9e0fe44d BH |
471 | if (scsi_bufflen(cmd)) { |
472 | cmd->SCp.buffer = scsi_sglist(cmd); | |
473 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
1da177e4 LT |
474 | cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer); |
475 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
1da177e4 LT |
476 | } else { |
477 | cmd->SCp.buffer = NULL; | |
478 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
479 | cmd->SCp.ptr = NULL; |
480 | cmd->SCp.this_residual = 0; | |
1da177e4 LT |
481 | } |
482 | ||
483 | } | |
484 | ||
1da177e4 LT |
485 | #include <linux/delay.h> |
486 | ||
9829e528 | 487 | #if NDEBUG |
1da177e4 LT |
488 | static struct { |
489 | unsigned char mask; | |
490 | const char * name;} | |
491 | signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
492 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
493 | { SR_SEL, "SEL" }, {0, NULL}}, | |
494 | basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}}, | |
495 | icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
496 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
497 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
498 | {0, NULL}}, | |
499 | mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
500 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
501 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
502 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
503 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
504 | {0, NULL}}; | |
505 | ||
506 | /* | |
507 | * Function : void NCR5380_print(struct Scsi_Host *instance) | |
508 | * | |
509 | * Purpose : print the SCSI bus signals for debugging purposes | |
510 | * | |
511 | * Input : instance - which NCR5380 | |
512 | */ | |
513 | ||
514 | static void NCR5380_print(struct Scsi_Host *instance) { | |
515 | unsigned char status, data, basr, mr, icr, i; | |
516 | unsigned long flags; | |
517 | ||
518 | local_irq_save(flags); | |
519 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
520 | status = NCR5380_read(STATUS_REG); | |
521 | mr = NCR5380_read(MODE_REG); | |
522 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
523 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
524 | local_irq_restore(flags); | |
525 | printk("STATUS_REG: %02x ", status); | |
526 | for (i = 0; signals[i].mask ; ++i) | |
527 | if (status & signals[i].mask) | |
528 | printk(",%s", signals[i].name); | |
529 | printk("\nBASR: %02x ", basr); | |
530 | for (i = 0; basrs[i].mask ; ++i) | |
531 | if (basr & basrs[i].mask) | |
532 | printk(",%s", basrs[i].name); | |
533 | printk("\nICR: %02x ", icr); | |
534 | for (i = 0; icrs[i].mask; ++i) | |
535 | if (icr & icrs[i].mask) | |
536 | printk(",%s", icrs[i].name); | |
537 | printk("\nMODE: %02x ", mr); | |
538 | for (i = 0; mrs[i].mask; ++i) | |
539 | if (mr & mrs[i].mask) | |
540 | printk(",%s", mrs[i].name); | |
541 | printk("\n"); | |
542 | } | |
543 | ||
544 | static struct { | |
545 | unsigned char value; | |
546 | const char *name; | |
547 | } phases[] = { | |
548 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, | |
549 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
550 | {PHASE_UNKNOWN, "UNKNOWN"}}; | |
551 | ||
552 | /* | |
553 | * Function : void NCR5380_print_phase(struct Scsi_Host *instance) | |
554 | * | |
555 | * Purpose : print the current SCSI phase for debugging purposes | |
556 | * | |
557 | * Input : instance - which NCR5380 | |
558 | */ | |
559 | ||
560 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
561 | { | |
562 | unsigned char status; | |
563 | int i; | |
564 | ||
565 | status = NCR5380_read(STATUS_REG); | |
566 | if (!(status & SR_REQ)) | |
567 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
568 | else { | |
569 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
570 | (phases[i].value != (status & PHASE_MASK)); ++i); | |
571 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
572 | } | |
573 | } | |
574 | ||
1da177e4 LT |
575 | #endif |
576 | ||
577 | /* | |
578 | * ++roman: New scheme of calling NCR5380_main() | |
579 | * | |
580 | * If we're not in an interrupt, we can call our main directly, it cannot be | |
581 | * already running. Else, we queue it on a task queue, if not 'main_running' | |
582 | * tells us that a lower level is already executing it. This way, | |
583 | * 'main_running' needs not be protected in a special way. | |
584 | * | |
585 | * queue_main() is a utility function for putting our main onto the task | |
586 | * queue, if main_running is false. It should be called only from a | |
587 | * interrupt or bottom half. | |
588 | */ | |
589 | ||
5a0e3ad6 | 590 | #include <linux/gfp.h> |
1da177e4 LT |
591 | #include <linux/workqueue.h> |
592 | #include <linux/interrupt.h> | |
593 | ||
594 | static volatile int main_running = 0; | |
2bb71b5a | 595 | static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); |
1da177e4 LT |
596 | |
597 | static __inline__ void queue_main(void) | |
598 | { | |
599 | if (!main_running) { | |
600 | /* If in interrupt and NCR5380_main() not already running, | |
601 | queue it on the 'immediate' task queue, to be processed | |
602 | immediately after the current interrupt processing has | |
603 | finished. */ | |
604 | schedule_work(&NCR5380_tqueue); | |
605 | } | |
606 | /* else: nothing to do: the running NCR5380_main() will pick up | |
607 | any newly queued command. */ | |
608 | } | |
609 | ||
610 | ||
611 | static inline void NCR5380_all_init (void) | |
612 | { | |
613 | static int done = 0; | |
614 | if (!done) { | |
d65e634a | 615 | dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n"); |
1da177e4 LT |
616 | done = 1; |
617 | } | |
618 | } | |
619 | ||
620 | ||
621 | /* | |
622 | * Function : void NCR58380_print_options (struct Scsi_Host *instance) | |
623 | * | |
624 | * Purpose : called by probe code indicating the NCR5380 driver | |
625 | * options that were selected. | |
626 | * | |
627 | * Inputs : instance, pointer to this instance. Unused. | |
628 | */ | |
629 | ||
630 | static void __init NCR5380_print_options (struct Scsi_Host *instance) | |
631 | { | |
632 | printk(" generic options" | |
633 | #ifdef AUTOSENSE | |
634 | " AUTOSENSE" | |
635 | #endif | |
636 | #ifdef REAL_DMA | |
637 | " REAL DMA" | |
638 | #endif | |
639 | #ifdef PARITY | |
640 | " PARITY" | |
641 | #endif | |
642 | #ifdef SUPPORT_TAGS | |
643 | " SCSI-2 TAGGED QUEUING" | |
644 | #endif | |
645 | ); | |
646 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); | |
647 | } | |
648 | ||
649 | /* | |
650 | * Function : void NCR5380_print_status (struct Scsi_Host *instance) | |
651 | * | |
652 | * Purpose : print commands in the various queues, called from | |
653 | * NCR5380_abort and NCR5380_debug to aid debugging. | |
654 | * | |
655 | * Inputs : instance, pointer to this instance. | |
656 | */ | |
657 | ||
9dcc26cf | 658 | static void lprint_Scsi_Cmnd(Scsi_Cmnd *cmd) |
1da177e4 | 659 | { |
9dcc26cf GU |
660 | int i, s; |
661 | unsigned char *command; | |
662 | printk("scsi%d: destination target %d, lun %d\n", | |
663 | H_NO(cmd), cmd->device->id, cmd->device->lun); | |
664 | printk(KERN_CONT " command = "); | |
665 | command = cmd->cmnd; | |
666 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
667 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
668 | printk(KERN_CONT " %02x", command[i]); | |
669 | printk("\n"); | |
1da177e4 LT |
670 | } |
671 | ||
9dcc26cf | 672 | static void NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 673 | { |
9dcc26cf GU |
674 | struct NCR5380_hostdata *hostdata; |
675 | Scsi_Cmnd *ptr; | |
676 | unsigned long flags; | |
677 | ||
8ad3a593 FT |
678 | NCR5380_dprint(NDEBUG_ANY, instance); |
679 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
9dcc26cf GU |
680 | |
681 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
682 | ||
683 | printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); | |
684 | local_irq_save(flags); | |
685 | printk("NCR5380: coroutine is%s running.\n", | |
686 | main_running ? "" : "n't"); | |
687 | if (!hostdata->connected) | |
688 | printk("scsi%d: no currently connected command\n", HOSTNO); | |
689 | else | |
690 | lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected); | |
691 | printk("scsi%d: issue_queue\n", HOSTNO); | |
692 | for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) | |
693 | lprint_Scsi_Cmnd(ptr); | |
694 | ||
695 | printk("scsi%d: disconnected_queue\n", HOSTNO); | |
696 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; | |
697 | ptr = NEXT(ptr)) | |
698 | lprint_Scsi_Cmnd(ptr); | |
699 | ||
700 | local_irq_restore(flags); | |
701 | printk("\n"); | |
1da177e4 LT |
702 | } |
703 | ||
9dcc26cf | 704 | static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m) |
1da177e4 | 705 | { |
9dcc26cf GU |
706 | int i, s; |
707 | unsigned char *command; | |
708 | seq_printf(m, "scsi%d: destination target %d, lun %d\n", | |
709 | H_NO(cmd), cmd->device->id, cmd->device->lun); | |
710 | seq_printf(m, " command = "); | |
711 | command = cmd->cmnd; | |
712 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); | |
713 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
714 | seq_printf(m, " %02x", command[i]); | |
715 | seq_printf(m, "\n"); | |
1da177e4 LT |
716 | } |
717 | ||
9dcc26cf GU |
718 | static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance) |
719 | { | |
720 | struct NCR5380_hostdata *hostdata; | |
721 | Scsi_Cmnd *ptr; | |
722 | unsigned long flags; | |
723 | ||
724 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
725 | ||
726 | seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); | |
727 | local_irq_save(flags); | |
728 | seq_printf(m, "NCR5380: coroutine is%s running.\n", | |
729 | main_running ? "" : "n't"); | |
730 | if (!hostdata->connected) | |
731 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
732 | else | |
733 | show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m); | |
734 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); | |
735 | for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) | |
736 | show_Scsi_Cmnd(ptr, m); | |
737 | ||
738 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
739 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; | |
740 | ptr = NEXT(ptr)) | |
741 | show_Scsi_Cmnd(ptr, m); | |
742 | ||
743 | local_irq_restore(flags); | |
744 | return 0; | |
745 | } | |
1da177e4 LT |
746 | |
747 | /* | |
748 | * Function : void NCR5380_init (struct Scsi_Host *instance) | |
749 | * | |
750 | * Purpose : initializes *instance and corresponding 5380 chip. | |
751 | * | |
752 | * Inputs : instance - instantiation of the 5380 driver. | |
753 | * | |
754 | * Notes : I assume that the host, hostno, and id bits have been | |
755 | * set correctly. I don't care about the irq and other fields. | |
756 | * | |
757 | */ | |
758 | ||
d559c49e | 759 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 LT |
760 | { |
761 | int i; | |
762 | SETUP_HOSTDATA(instance); | |
763 | ||
764 | NCR5380_all_init(); | |
765 | ||
766 | hostdata->aborted = 0; | |
767 | hostdata->id_mask = 1 << instance->this_id; | |
768 | hostdata->id_higher_mask = 0; | |
769 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
770 | if (i > hostdata->id_mask) | |
771 | hostdata->id_higher_mask |= i; | |
772 | for (i = 0; i < 8; ++i) | |
773 | hostdata->busy[i] = 0; | |
774 | #ifdef SUPPORT_TAGS | |
775 | init_tags(); | |
776 | #endif | |
777 | #if defined (REAL_DMA) | |
778 | hostdata->dma_len = 0; | |
779 | #endif | |
780 | hostdata->targets_present = 0; | |
781 | hostdata->connected = NULL; | |
782 | hostdata->issue_queue = NULL; | |
783 | hostdata->disconnected_queue = NULL; | |
784 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; | |
785 | ||
786 | if (!the_template) { | |
787 | the_template = instance->hostt; | |
788 | first_instance = instance; | |
789 | } | |
790 | ||
791 | ||
792 | #ifndef AUTOSENSE | |
793 | if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) | |
794 | printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" | |
795 | " without AUTOSENSE option, contingent allegiance conditions may\n" | |
796 | " be incorrectly cleared.\n", HOSTNO); | |
797 | #endif /* def AUTOSENSE */ | |
798 | ||
799 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
800 | NCR5380_write(MODE_REG, MR_BASE); | |
801 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
802 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
19b6c51c GU |
807 | static void NCR5380_exit(struct Scsi_Host *instance) |
808 | { | |
809 | /* Empty, as we didn't schedule any delayed work */ | |
810 | } | |
811 | ||
1da177e4 | 812 | /* |
811c9366 H |
813 | * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd, |
814 | * void (*done)(struct scsi_cmnd *)) | |
1da177e4 LT |
815 | * |
816 | * Purpose : enqueues a SCSI command | |
817 | * | |
818 | * Inputs : cmd - SCSI command, done - function called on completion, with | |
819 | * a pointer to the command descriptor. | |
820 | * | |
821 | * Returns : 0 | |
822 | * | |
823 | * Side effects : | |
824 | * cmd is added to the per instance issue_queue, with minor | |
825 | * twiddling done to the host specific fields of cmd. If the | |
826 | * main coroutine is not running, it is restarted. | |
827 | * | |
828 | */ | |
829 | ||
830 | /* Only make static if a wrapper function is used */ | |
f281233d | 831 | static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd, |
811c9366 | 832 | void (*done)(struct scsi_cmnd *)) |
1da177e4 LT |
833 | { |
834 | SETUP_HOSTDATA(cmd->device->host); | |
811c9366 | 835 | struct scsi_cmnd *tmp; |
1da177e4 LT |
836 | unsigned long flags; |
837 | ||
838 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
839 | switch (cmd->cmnd[0]) { | |
840 | case WRITE_6: | |
841 | case WRITE_10: | |
842 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | |
843 | H_NO(cmd)); | |
844 | cmd->result = (DID_ERROR << 16); | |
845 | done(cmd); | |
846 | return 0; | |
847 | } | |
848 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ | |
849 | ||
850 | ||
851 | #ifdef NCR5380_STATS | |
852 | # if 0 | |
853 | if (!hostdata->connected && !hostdata->issue_queue && | |
854 | !hostdata->disconnected_queue) { | |
855 | hostdata->timebase = jiffies; | |
856 | } | |
857 | # endif | |
858 | # ifdef NCR5380_STAT_LIMIT | |
9e0fe44d | 859 | if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT) |
1da177e4 LT |
860 | # endif |
861 | switch (cmd->cmnd[0]) | |
862 | { | |
863 | case WRITE: | |
864 | case WRITE_6: | |
865 | case WRITE_10: | |
866 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); | |
9e0fe44d | 867 | hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); |
1da177e4 LT |
868 | hostdata->pendingw++; |
869 | break; | |
870 | case READ: | |
871 | case READ_6: | |
872 | case READ_10: | |
873 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); | |
9e0fe44d | 874 | hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); |
1da177e4 LT |
875 | hostdata->pendingr++; |
876 | break; | |
877 | } | |
878 | #endif | |
879 | ||
880 | /* | |
881 | * We use the host_scribble field as a pointer to the next command | |
882 | * in a queue | |
883 | */ | |
884 | ||
a5cb67f7 | 885 | SET_NEXT(cmd, NULL); |
1da177e4 LT |
886 | cmd->scsi_done = done; |
887 | ||
888 | cmd->result = 0; | |
889 | ||
890 | ||
891 | /* | |
892 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
893 | * commands are added to the head of the queue since any command will | |
894 | * clear the contingent allegiance condition that exists and the | |
895 | * sense data is only guaranteed to be valid while the condition exists. | |
896 | */ | |
897 | ||
898 | local_irq_save(flags); | |
899 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. | |
900 | * Otherwise a running NCR5380_main may steal the lock. | |
901 | * Lock before actually inserting due to fairness reasons explained in | |
902 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
903 | * to release the lock. | |
904 | * Stop timer for this command while waiting for the lock, or timeouts | |
905 | * may happen (and they really do), and it's no good if the command doesn't | |
906 | * appear in any of the queues. | |
907 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
908 | * because also a timer int can trigger an abort or reset, which would | |
909 | * alter queues and touch the lock. | |
910 | */ | |
911 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
912 | LIST(cmd, hostdata->issue_queue); | |
a5cb67f7 | 913 | SET_NEXT(cmd, hostdata->issue_queue); |
1da177e4 LT |
914 | hostdata->issue_queue = cmd; |
915 | } else { | |
811c9366 | 916 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
1da177e4 LT |
917 | NEXT(tmp); tmp = NEXT(tmp)) |
918 | ; | |
919 | LIST(cmd, tmp); | |
a5cb67f7 | 920 | SET_NEXT(tmp, cmd); |
1da177e4 LT |
921 | } |
922 | ||
923 | local_irq_restore(flags); | |
924 | ||
d65e634a | 925 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
1da177e4 LT |
926 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
927 | ||
928 | /* If queue_command() is called from an interrupt (real one or bottom | |
929 | * half), we let queue_main() do the job of taking care about main. If it | |
930 | * is already running, this is a no-op, else main will be queued. | |
931 | * | |
932 | * If we're not in an interrupt, we can call NCR5380_main() | |
933 | * unconditionally, because it cannot be already running. | |
934 | */ | |
935 | if (in_interrupt() || ((flags >> 8) & 7) >= 6) | |
936 | queue_main(); | |
937 | else | |
938 | NCR5380_main(NULL); | |
939 | return 0; | |
940 | } | |
941 | ||
f281233d JG |
942 | static DEF_SCSI_QCMD(NCR5380_queue_command) |
943 | ||
1da177e4 LT |
944 | /* |
945 | * Function : NCR5380_main (void) | |
946 | * | |
947 | * Purpose : NCR5380_main is a coroutine that runs as long as more work can | |
948 | * be done on the NCR5380 host adapters in a system. Both | |
949 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
950 | * in case it is not running. | |
951 | * | |
952 | * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should | |
953 | * reenable them. This prevents reentrancy and kernel stack overflow. | |
954 | */ | |
955 | ||
2bb71b5a | 956 | static void NCR5380_main (struct work_struct *bl) |
1da177e4 | 957 | { |
811c9366 | 958 | struct scsi_cmnd *tmp, *prev; |
1da177e4 LT |
959 | struct Scsi_Host *instance = first_instance; |
960 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); | |
961 | int done; | |
962 | unsigned long flags; | |
963 | ||
964 | /* | |
965 | * We run (with interrupts disabled) until we're sure that none of | |
966 | * the host adapters have anything that can be done, at which point | |
967 | * we set main_running to 0 and exit. | |
968 | * | |
969 | * Interrupts are enabled before doing various other internal | |
970 | * instructions, after we've decided that we need to run through | |
971 | * the loop again. | |
972 | * | |
973 | * this should prevent any race conditions. | |
974 | * | |
975 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
976 | * because also a timer int can trigger an abort or reset, which can | |
977 | * alter queues and touch the Falcon lock. | |
978 | */ | |
979 | ||
980 | /* Tell int handlers main() is now already executing. Note that | |
981 | no races are possible here. If an int comes in before | |
982 | 'main_running' is set here, and queues/executes main via the | |
983 | task queue, it doesn't do any harm, just this instance of main | |
984 | won't find any work left to do. */ | |
985 | if (main_running) | |
986 | return; | |
987 | main_running = 1; | |
988 | ||
989 | local_save_flags(flags); | |
990 | do { | |
991 | local_irq_disable(); /* Freeze request queues */ | |
992 | done = 1; | |
993 | ||
994 | if (!hostdata->connected) { | |
d65e634a | 995 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO ); |
1da177e4 LT |
996 | /* |
997 | * Search through the issue_queue for a command destined | |
998 | * for a target that's not busy. | |
999 | */ | |
1000 | #if (NDEBUG & NDEBUG_LISTS) | |
811c9366 | 1001 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
1da177e4 LT |
1002 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
1003 | ; | |
1004 | if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/ | |
1005 | #endif | |
811c9366 | 1006 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
1da177e4 LT |
1007 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) { |
1008 | ||
1da177e4 | 1009 | if (prev != tmp) |
16b9d870 | 1010 | dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun); |
1da177e4 LT |
1011 | /* When we find one, remove it from the issue queue. */ |
1012 | /* ++guenther: possible race with Falcon locking */ | |
1013 | if ( | |
1014 | #ifdef SUPPORT_TAGS | |
1015 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) | |
1016 | #else | |
1017 | !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) | |
1018 | #endif | |
1019 | ) { | |
1020 | /* ++guenther: just to be sure, this must be atomic */ | |
1021 | local_irq_disable(); | |
1022 | if (prev) { | |
1023 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
a5cb67f7 | 1024 | SET_NEXT(prev, NEXT(tmp)); |
1da177e4 LT |
1025 | } else { |
1026 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1027 | hostdata->issue_queue = NEXT(tmp); | |
1028 | } | |
a5cb67f7 | 1029 | SET_NEXT(tmp, NULL); |
1da177e4 LT |
1030 | |
1031 | /* reenable interrupts after finding one */ | |
1032 | local_irq_restore(flags); | |
1033 | ||
1034 | /* | |
1035 | * Attempt to establish an I_T_L nexus here. | |
1036 | * On success, instance->hostdata->connected is set. | |
1037 | * On failure, we must add the command back to the | |
1038 | * issue queue so we can keep trying. | |
1039 | */ | |
d65e634a | 1040 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
1da177e4 | 1041 | "lun %d removed from issue_queue\n", |
4dde8f7d | 1042 | HOSTNO, tmp->device->id, tmp->device->lun); |
1da177e4 LT |
1043 | /* |
1044 | * REQUEST SENSE commands are issued without tagged | |
1045 | * queueing, even on SCSI-II devices because the | |
1046 | * contingent allegiance condition exists for the | |
1047 | * entire unit. | |
1048 | */ | |
1049 | /* ++roman: ...and the standard also requires that | |
1050 | * REQUEST SENSE command are untagged. | |
1051 | */ | |
1052 | ||
1053 | #ifdef SUPPORT_TAGS | |
1054 | cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE ); | |
1055 | #endif | |
1056 | if (!NCR5380_select(instance, tmp, | |
1057 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : | |
1058 | TAG_NEXT)) { | |
1059 | break; | |
1060 | } else { | |
1061 | local_irq_disable(); | |
1062 | LIST(tmp, hostdata->issue_queue); | |
a5cb67f7 | 1063 | SET_NEXT(tmp, hostdata->issue_queue); |
1da177e4 LT |
1064 | hostdata->issue_queue = tmp; |
1065 | #ifdef SUPPORT_TAGS | |
1066 | cmd_free_tag( tmp ); | |
1067 | #endif | |
1068 | local_irq_restore(flags); | |
d65e634a | 1069 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
1da177e4 LT |
1070 | "returned to issue_queue\n", HOSTNO); |
1071 | if (hostdata->connected) | |
1072 | break; | |
1073 | } | |
1074 | } /* if target/lun/target queue is not busy */ | |
1075 | } /* for issue_queue */ | |
1076 | } /* if (!hostdata->connected) */ | |
1077 | if (hostdata->connected | |
1078 | #ifdef REAL_DMA | |
1079 | && !hostdata->dma_len | |
1080 | #endif | |
1081 | ) { | |
1082 | local_irq_restore(flags); | |
d65e634a | 1083 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
1da177e4 LT |
1084 | HOSTNO); |
1085 | NCR5380_information_transfer(instance); | |
d65e634a | 1086 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
1da177e4 LT |
1087 | done = 0; |
1088 | } | |
1089 | } while (!done); | |
1090 | ||
1091 | /* Better allow ints _after_ 'main_running' has been cleared, else | |
1092 | an interrupt could believe we'll pick up the work it left for | |
1093 | us, but we won't see it anymore here... */ | |
1094 | main_running = 0; | |
1095 | local_irq_restore(flags); | |
1096 | } | |
1097 | ||
1098 | ||
1099 | #ifdef REAL_DMA | |
1100 | /* | |
1101 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1102 | * | |
1103 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
1104 | * mismatch occurs (which would finish the DMA transfer). | |
1105 | * | |
1106 | * Inputs : instance - this instance of the NCR5380. | |
1107 | * | |
1108 | */ | |
1109 | ||
1110 | static void NCR5380_dma_complete( struct Scsi_Host *instance ) | |
1111 | { | |
1112 | SETUP_HOSTDATA(instance); | |
1113 | int transfered; | |
1114 | unsigned char **data; | |
1115 | volatile int *count; | |
1116 | ||
1117 | if (!hostdata->connected) { | |
1118 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | |
1119 | "no connected cmd\n", HOSTNO); | |
1120 | return; | |
1121 | } | |
1122 | ||
d65e634a | 1123 | dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
1da177e4 LT |
1124 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
1125 | NCR5380_read(STATUS_REG)); | |
1126 | ||
1127 | if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1128 | printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO); | |
1129 | printk("please e-mail sammy@sammy.net with a description of how this\n"); | |
1130 | printk("error was produced.\n"); | |
1131 | BUG(); | |
1132 | } | |
1133 | ||
1134 | /* make sure we're not stuck in a data phase */ | |
1135 | if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | | |
1136 | BASR_ACK)) == | |
1137 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1138 | printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG)); | |
1139 | printk("scsi%d: bus stuck in data phase -- probably a single byte " | |
1140 | "overrun!\n", HOSTNO); | |
1141 | printk("not prepared for this error!\n"); | |
1142 | printk("please e-mail sammy@sammy.net with a description of how this\n"); | |
1143 | printk("error was produced.\n"); | |
1144 | BUG(); | |
1145 | } | |
1146 | ||
1147 | ||
1148 | ||
1149 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1150 | NCR5380_write(MODE_REG, MR_BASE); | |
1151 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1152 | ||
1153 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); | |
1154 | hostdata->dma_len = 0; | |
1155 | ||
1156 | data = (unsigned char **) &(hostdata->connected->SCp.ptr); | |
1157 | count = &(hostdata->connected->SCp.this_residual); | |
1158 | *data += transfered; | |
1159 | *count -= transfered; | |
1160 | ||
1161 | } | |
1162 | #endif /* REAL_DMA */ | |
1163 | ||
1164 | ||
1165 | /* | |
1166 | * Function : void NCR5380_intr (int irq) | |
1167 | * | |
1168 | * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses | |
1169 | * from the disconnected queue, and restarting NCR5380_main() | |
1170 | * as required. | |
1171 | * | |
1172 | * Inputs : int irq, irq that caused this interrupt. | |
1173 | * | |
1174 | */ | |
1175 | ||
7d12e780 | 1176 | static irqreturn_t NCR5380_intr (int irq, void *dev_id) |
1da177e4 LT |
1177 | { |
1178 | struct Scsi_Host *instance = first_instance; | |
1179 | int done = 1, handled = 0; | |
1180 | unsigned char basr; | |
1181 | ||
d65e634a | 1182 | dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO); |
1da177e4 LT |
1183 | |
1184 | /* Look for pending interrupts */ | |
1185 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
d65e634a | 1186 | dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr); |
1da177e4 LT |
1187 | /* dispatch to appropriate routine if found and done=0 */ |
1188 | if (basr & BASR_IRQ) { | |
8ad3a593 | 1189 | NCR5380_dprint(NDEBUG_INTR, instance); |
1da177e4 LT |
1190 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
1191 | done = 0; | |
c39e7eee | 1192 | // ENABLE_IRQ(); |
d65e634a | 1193 | dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO); |
1da177e4 LT |
1194 | NCR5380_reselect(instance); |
1195 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1196 | } | |
1197 | else if (basr & BASR_PARITY_ERROR) { | |
d65e634a | 1198 | dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO); |
1da177e4 LT |
1199 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1200 | } | |
1201 | else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
d65e634a | 1202 | dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO); |
1da177e4 LT |
1203 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1204 | } | |
1205 | else { | |
1206 | /* | |
1207 | * The rest of the interrupt conditions can occur only during a | |
1208 | * DMA transfer | |
1209 | */ | |
1210 | ||
1211 | #if defined(REAL_DMA) | |
1212 | /* | |
1213 | * We should only get PHASE MISMATCH and EOP interrupts if we have | |
1214 | * DMA enabled, so do a sanity check based on the current setting | |
1215 | * of the MODE register. | |
1216 | */ | |
1217 | ||
1218 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | |
1219 | ((basr & BASR_END_DMA_TRANSFER) || | |
1220 | !(basr & BASR_PHASE_MATCH))) { | |
1221 | ||
d65e634a | 1222 | dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
1da177e4 LT |
1223 | NCR5380_dma_complete( instance ); |
1224 | done = 0; | |
c39e7eee | 1225 | // ENABLE_IRQ(); |
1da177e4 LT |
1226 | } else |
1227 | #endif /* REAL_DMA */ | |
1228 | { | |
1229 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ | |
1230 | if (basr & BASR_PHASE_MATCH) | |
d65e634a | 1231 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt, " |
1da177e4 LT |
1232 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", |
1233 | HOSTNO, basr, NCR5380_read(MODE_REG), | |
1234 | NCR5380_read(STATUS_REG)); | |
1235 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1236 | #ifdef SUN3_SCSI_VME | |
1237 | dregs->csr |= CSR_DMA_ENABLE; | |
1238 | #endif | |
1239 | } | |
1240 | } /* if !(SELECTION || PARITY) */ | |
1241 | handled = 1; | |
1242 | } /* BASR & IRQ */ | |
1243 | else { | |
1244 | ||
1245 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | |
1246 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | |
1247 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | |
1248 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1249 | #ifdef SUN3_SCSI_VME | |
1250 | dregs->csr |= CSR_DMA_ENABLE; | |
1251 | #endif | |
1252 | } | |
1253 | ||
1254 | if (!done) { | |
d65e634a | 1255 | dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO); |
1da177e4 LT |
1256 | /* Put a call to NCR5380_main() on the queue... */ |
1257 | queue_main(); | |
1258 | } | |
1259 | return IRQ_RETVAL(handled); | |
1260 | } | |
1261 | ||
1262 | #ifdef NCR5380_STATS | |
811c9366 H |
1263 | static void collect_stats(struct NCR5380_hostdata *hostdata, |
1264 | struct scsi_cmnd *cmd) | |
1da177e4 LT |
1265 | { |
1266 | # ifdef NCR5380_STAT_LIMIT | |
9e0fe44d | 1267 | if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT) |
1da177e4 LT |
1268 | # endif |
1269 | switch (cmd->cmnd[0]) | |
1270 | { | |
1271 | case WRITE: | |
1272 | case WRITE_6: | |
1273 | case WRITE_10: | |
1274 | hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); | |
9e0fe44d | 1275 | /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/ |
1da177e4 LT |
1276 | hostdata->pendingw--; |
1277 | break; | |
1278 | case READ: | |
1279 | case READ_6: | |
1280 | case READ_10: | |
1281 | hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); | |
9e0fe44d | 1282 | /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/ |
1da177e4 LT |
1283 | hostdata->pendingr--; |
1284 | break; | |
1285 | } | |
1286 | } | |
1287 | #endif | |
1288 | ||
1289 | /* | |
811c9366 H |
1290 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1291 | * struct scsi_cmnd *cmd, int tag); | |
1da177e4 LT |
1292 | * |
1293 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
1294 | * including ARBITRATION, SELECTION, and initial message out for | |
1295 | * IDENTIFY and queue messages. | |
1296 | * | |
1297 | * Inputs : instance - instantiation of the 5380 driver on which this | |
1298 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for | |
1299 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for | |
1300 | * the command that is presently connected. | |
1301 | * | |
1302 | * Returns : -1 if selection could not execute for some reason, | |
1303 | * 0 if selection succeeded or failed because the target | |
1304 | * did not respond. | |
1305 | * | |
1306 | * Side effects : | |
1307 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1308 | * with registers as they should have been on entry - ie | |
1309 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1310 | * will cease to drive any SCSI bus signals. | |
1311 | * | |
1312 | * If successful : I_T_L or I_T_L_Q nexus will be established, | |
1313 | * instance->connected will be set to cmd. | |
1314 | * SELECT interrupt will be disabled. | |
1315 | * | |
1316 | * If failed (no target) : cmd->scsi_done() will be called, and the | |
1317 | * cmd->result host byte set to DID_BAD_TARGET. | |
1318 | */ | |
1319 | ||
811c9366 H |
1320 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd, |
1321 | int tag) | |
1da177e4 LT |
1322 | { |
1323 | SETUP_HOSTDATA(instance); | |
1324 | unsigned char tmp[3], phase; | |
1325 | unsigned char *data; | |
1326 | int len; | |
1327 | unsigned long timeout; | |
1328 | unsigned long flags; | |
1329 | ||
1330 | hostdata->restart_select = 0; | |
8ad3a593 | 1331 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1332 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
1da177e4 LT |
1333 | instance->this_id); |
1334 | ||
1335 | /* | |
1336 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1337 | * data bus during SELECTION. | |
1338 | */ | |
1339 | ||
1340 | local_irq_save(flags); | |
1341 | if (hostdata->connected) { | |
1342 | local_irq_restore(flags); | |
1343 | return -1; | |
1344 | } | |
1345 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1346 | ||
1347 | ||
1348 | /* | |
1349 | * Start arbitration. | |
1350 | */ | |
1351 | ||
1352 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); | |
1353 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1354 | ||
1355 | local_irq_restore(flags); | |
1356 | ||
1357 | /* Wait for arbitration logic to complete */ | |
0cb8cd76 | 1358 | #ifdef NCR_TIMEOUT |
1da177e4 LT |
1359 | { |
1360 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; | |
1361 | ||
1362 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) | |
1363 | && time_before(jiffies, timeout) && !hostdata->connected) | |
1364 | ; | |
1365 | if (time_after_eq(jiffies, timeout)) | |
1366 | { | |
1367 | printk("scsi : arbitration timeout at %d\n", __LINE__); | |
1368 | NCR5380_write(MODE_REG, MR_BASE); | |
1369 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1370 | return -1; | |
1371 | } | |
1372 | } | |
1373 | #else /* NCR_TIMEOUT */ | |
1374 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) | |
1375 | && !hostdata->connected); | |
1376 | #endif | |
1377 | ||
d65e634a | 1378 | dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO); |
1da177e4 LT |
1379 | |
1380 | if (hostdata->connected) { | |
1381 | NCR5380_write(MODE_REG, MR_BASE); | |
1382 | return -1; | |
1383 | } | |
1384 | /* | |
1385 | * The arbitration delay is 2.2us, but this is a minimum and there is | |
1386 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | |
1387 | * the integral nature of udelay(). | |
1388 | * | |
1389 | */ | |
1390 | ||
1391 | udelay(3); | |
1392 | ||
1393 | /* Check for lost arbitration */ | |
1394 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1395 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1396 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1397 | hostdata->connected) { | |
1398 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1399 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
1da177e4 LT |
1400 | HOSTNO); |
1401 | return -1; | |
1402 | } | |
1403 | ||
1404 | /* after/during arbitration, BSY should be asserted. | |
1405 | IBM DPES-31080 Version S31Q works now */ | |
1406 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ | |
1407 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL | | |
1408 | ICR_ASSERT_BSY ) ; | |
1409 | ||
1410 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1411 | hostdata->connected) { | |
1412 | NCR5380_write(MODE_REG, MR_BASE); | |
1413 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
d65e634a | 1414 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
1da177e4 LT |
1415 | HOSTNO); |
1416 | return -1; | |
1417 | } | |
1418 | ||
1419 | /* | |
1420 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1421 | * a minimum so we'll udelay ceil(1.2) | |
1422 | */ | |
1423 | ||
1424 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY | |
1425 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ | |
1426 | udelay(15); | |
1427 | #else | |
1428 | udelay(2); | |
1429 | #endif | |
1430 | ||
1431 | if (hostdata->connected) { | |
1432 | NCR5380_write(MODE_REG, MR_BASE); | |
1433 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1434 | return -1; | |
1435 | } | |
1436 | ||
d65e634a | 1437 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * Now that we have won arbitration, start Selection process, asserting | |
1441 | * the host and target ID's on the SCSI bus. | |
1442 | */ | |
1443 | ||
1444 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1445 | ||
1446 | /* | |
1447 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1448 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1449 | * phase immediately after selection. | |
1450 | */ | |
1451 | ||
1452 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1453 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1454 | NCR5380_write(MODE_REG, MR_BASE); | |
1455 | ||
1456 | /* | |
1457 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1458 | * otherwise we will trigger an interrupt. | |
1459 | */ | |
1460 | ||
1461 | if (hostdata->connected) { | |
1462 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1463 | return -1; | |
1464 | } | |
1465 | ||
1466 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1467 | ||
1468 | /* | |
1469 | * The initiator shall then wait at least two deskew delays and release | |
1470 | * the BSY signal. | |
1471 | */ | |
1472 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1473 | ||
1474 | /* Reset BSY */ | |
1475 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1476 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1477 | ||
1478 | /* | |
1479 | * Something weird happens when we cease to drive BSY - looks | |
1480 | * like the board/chip is letting us do another read before the | |
1481 | * appropriate propagation delay has expired, and we're confusing | |
1482 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1483 | * | |
1484 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1485 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1486 | * tighter 'C' code breaks and requires this) solves the problem - | |
1487 | * the 1 us delay is arbitrary, and only used because this delay will | |
1488 | * be the same on other platforms and since it works here, it should | |
1489 | * work there. | |
1490 | * | |
1491 | * wingel suggests that this could be due to failing to wait | |
1492 | * one deskew delay. | |
1493 | */ | |
1494 | ||
1495 | udelay(1); | |
1496 | ||
d65e634a | 1497 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 LT |
1498 | |
1499 | /* | |
1500 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1501 | * selection. | |
1502 | */ | |
1503 | ||
1504 | timeout = jiffies + 25; | |
1505 | ||
1506 | /* | |
1507 | * XXX very interesting - we're seeing a bounce where the BSY we | |
1508 | * asserted is being reflected / still asserted (propagation delay?) | |
1509 | * and it's detecting as true. Sigh. | |
1510 | */ | |
1511 | ||
1512 | #if 0 | |
1513 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert | |
1514 | * IO while SEL is true. But again, there are some disks out the in the | |
1515 | * world that do that nevertheless. (Somebody claimed that this announces | |
1516 | * reselection capability of the target.) So we better skip that test and | |
96de0e25 | 1517 | * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) |
1da177e4 LT |
1518 | */ |
1519 | ||
1520 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & | |
1521 | (SR_BSY | SR_IO))); | |
1522 | ||
1523 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == | |
1524 | (SR_SEL | SR_IO)) { | |
1525 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1526 | NCR5380_reselect(instance); | |
1527 | printk (KERN_ERR "scsi%d: reselection after won arbitration?\n", | |
1528 | HOSTNO); | |
1529 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1530 | return -1; | |
1531 | } | |
1532 | #else | |
1533 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)); | |
1534 | #endif | |
1535 | ||
1536 | /* | |
1537 | * No less than two deskew delays after the initiator detects the | |
1538 | * BSY signal is true, it shall release the SEL signal and may | |
1539 | * change the DATA BUS. -wingel | |
1540 | */ | |
1541 | ||
1542 | udelay(1); | |
1543 | ||
1544 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1545 | ||
1546 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { | |
1547 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1548 | if (hostdata->targets_present & (1 << cmd->device->id)) { | |
1549 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); | |
1550 | if (hostdata->restart_select) | |
1551 | printk(KERN_NOTICE "\trestart select\n"); | |
8ad3a593 | 1552 | NCR5380_dprint(NDEBUG_ANY, instance); |
1da177e4 LT |
1553 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1554 | return -1; | |
1555 | } | |
1556 | cmd->result = DID_BAD_TARGET << 16; | |
1557 | #ifdef NCR5380_STATS | |
1558 | collect_stats(hostdata, cmd); | |
1559 | #endif | |
1560 | #ifdef SUPPORT_TAGS | |
1561 | cmd_free_tag( cmd ); | |
1562 | #endif | |
1563 | cmd->scsi_done(cmd); | |
1564 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1565 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
1da177e4 LT |
1566 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | hostdata->targets_present |= (1 << cmd->device->id); | |
1571 | ||
1572 | /* | |
1573 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1574 | * was true but before BSY was false during selection, the information | |
1575 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1576 | * IDENTIFY message. | |
1577 | * | |
1578 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1579 | * message (2 bytes) with a tag ID that we increment with every command | |
1580 | * until it wraps back to 0. | |
1581 | * | |
1582 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1583 | * which claim to support tagged queuing but fail when more than | |
1584 | * some number of commands are issued at once. | |
1585 | */ | |
1586 | ||
1587 | /* Wait for start of REQ/ACK handshake */ | |
1588 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); | |
1589 | ||
d65e634a | 1590 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
1da177e4 LT |
1591 | HOSTNO, cmd->device->id); |
1592 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1593 | ||
1594 | #ifdef SUPPORT_TAGS | |
1595 | if (cmd->tag != TAG_NONE) { | |
1596 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1597 | tmp[2] = cmd->tag; | |
1598 | len = 3; | |
1599 | } else | |
1600 | len = 1; | |
1601 | #else | |
1602 | len = 1; | |
1603 | cmd->tag=0; | |
1604 | #endif /* SUPPORT_TAGS */ | |
1605 | ||
1606 | /* Send message(s) */ | |
1607 | data = tmp; | |
1608 | phase = PHASE_MSGOUT; | |
1609 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1610 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
1da177e4 LT |
1611 | /* XXX need to handle errors here */ |
1612 | hostdata->connected = cmd; | |
1613 | #ifndef SUPPORT_TAGS | |
1614 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
1615 | #endif | |
1616 | #ifdef SUN3_SCSI_VME | |
1617 | dregs->csr |= CSR_INTR; | |
1618 | #endif | |
1619 | initialize_SCp(cmd); | |
1620 | ||
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1627 | * unsigned char *phase, int *count, unsigned char **data) | |
1628 | * | |
1629 | * Purpose : transfers data in given phase using polled I/O | |
1630 | * | |
1631 | * Inputs : instance - instance of driver, *phase - pointer to | |
1632 | * what phase is expected, *count - pointer to number of | |
1633 | * bytes to transfer, **data - pointer to data pointer. | |
1634 | * | |
1635 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1636 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1637 | * is in same phase. |
1638 | * | |
1639 | * Also, *phase, *count, *data are modified in place. | |
1640 | * | |
1641 | * XXX Note : handling for bus free may be useful. | |
1642 | */ | |
1643 | ||
1644 | /* | |
1645 | * Note : this code is not as quick as it could be, however it | |
1646 | * IS 100% reliable, and for the actual data transfer where speed | |
1647 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1648 | */ | |
1649 | ||
1650 | static int NCR5380_transfer_pio( struct Scsi_Host *instance, | |
1651 | unsigned char *phase, int *count, | |
1652 | unsigned char **data) | |
1653 | { | |
1654 | register unsigned char p = *phase, tmp; | |
1655 | register int c = *count; | |
1656 | register unsigned char *d = *data; | |
1657 | ||
1658 | /* | |
1659 | * The NCR5380 chip will only drive the SCSI bus when the | |
1660 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1661 | * REGISTER match the STATUS REGISTER | |
1662 | */ | |
1663 | ||
1664 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); | |
1665 | ||
1666 | do { | |
1667 | /* | |
1668 | * Wait for assertion of REQ, after which the phase bits will be | |
1669 | * valid | |
1670 | */ | |
1671 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)); | |
1672 | ||
d65e634a | 1673 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 LT |
1674 | |
1675 | /* Check for phase mismatch */ | |
1676 | if ((tmp & PHASE_MASK) != p) { | |
d65e634a | 1677 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1678 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
1da177e4 LT |
1679 | break; |
1680 | } | |
1681 | ||
1682 | /* Do actual transfer from SCSI bus to / from memory */ | |
1683 | if (!(p & SR_IO)) | |
1684 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1685 | else | |
1686 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1687 | ||
1688 | ++d; | |
1689 | ||
1690 | /* | |
1691 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1692 | * should drop ATN on the last byte of the message phase | |
1693 | * after REQ has been asserted for the handshake but before | |
1694 | * the initiator raises ACK. | |
1695 | */ | |
1696 | ||
1697 | if (!(p & SR_IO)) { | |
1698 | if (!((p & SR_MSG) && c > 1)) { | |
1699 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1700 | ICR_ASSERT_DATA); | |
8ad3a593 | 1701 | NCR5380_dprint(NDEBUG_PIO, instance); |
1da177e4 LT |
1702 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1703 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1704 | } else { | |
1705 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1706 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1707 | NCR5380_dprint(NDEBUG_PIO, instance); |
1da177e4 LT |
1708 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1709 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1710 | } | |
1711 | } else { | |
8ad3a593 | 1712 | NCR5380_dprint(NDEBUG_PIO, instance); |
1da177e4 LT |
1713 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1714 | } | |
1715 | ||
1716 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1717 | ||
d65e634a | 1718 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
1da177e4 LT |
1719 | |
1720 | /* | |
1721 | * We have several special cases to consider during REQ/ACK handshaking : | |
1722 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1723 | * message. ATN must be dropped as ACK is dropped. | |
1724 | * | |
1725 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1726 | * message. We must exit with ACK asserted, so that the calling | |
1727 | * code may raise ATN before dropping ACK to reject the message. | |
1728 | * | |
1729 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1730 | */ | |
1731 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1732 | if (p == PHASE_MSGOUT && c > 1) | |
1733 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1734 | else | |
1735 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1736 | } | |
1737 | } while (--c); | |
1738 | ||
d65e634a | 1739 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
1da177e4 LT |
1740 | |
1741 | *count = c; | |
1742 | *data = d; | |
1743 | tmp = NCR5380_read(STATUS_REG); | |
1744 | /* The phase read from the bus is valid if either REQ is (already) | |
1745 | * asserted or if ACK hasn't been released yet. The latter is the case if | |
1746 | * we're in MSGIN and all wanted bytes have been received. */ | |
1747 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) | |
1748 | *phase = tmp & PHASE_MASK; | |
1749 | else | |
1750 | *phase = PHASE_UNKNOWN; | |
1751 | ||
1752 | if (!c || (*phase == p)) | |
1753 | return 0; | |
1754 | else | |
1755 | return -1; | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * Function : do_abort (Scsi_Host *host) | |
1760 | * | |
1761 | * Purpose : abort the currently established nexus. Should only be | |
1762 | * called from a routine which can drop into a | |
1763 | * | |
1764 | * Returns : 0 on success, -1 on failure. | |
1765 | */ | |
1766 | ||
1767 | static int do_abort (struct Scsi_Host *host) | |
1768 | { | |
1769 | unsigned char tmp, *msgptr, phase; | |
1770 | int len; | |
1771 | ||
1772 | /* Request message out phase */ | |
1773 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1774 | ||
1775 | /* | |
1776 | * Wait for the target to indicate a valid phase by asserting | |
1777 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1778 | * and can immediately send the ABORT message, or we'll have some | |
1779 | * other phase and will have to source/sink data. | |
1780 | * | |
1781 | * We really don't care what value was on the bus or what value | |
1782 | * the target sees, so we just handshake. | |
1783 | */ | |
1784 | ||
3be38e7a | 1785 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)); |
1da177e4 LT |
1786 | |
1787 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1788 | ||
1789 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1790 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1791 | ICR_ASSERT_ACK); | |
1792 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1793 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1794 | } | |
1795 | ||
1796 | tmp = ABORT; | |
1797 | msgptr = &tmp; | |
1798 | len = 1; | |
1799 | phase = PHASE_MSGOUT; | |
1800 | NCR5380_transfer_pio (host, &phase, &len, &msgptr); | |
1801 | ||
1802 | /* | |
1803 | * If we got here, and the command completed successfully, | |
1804 | * we're about to go into bus free state. | |
1805 | */ | |
1806 | ||
1807 | return len ? -1 : 0; | |
1808 | } | |
1809 | ||
1810 | #if defined(REAL_DMA) | |
1811 | /* | |
1812 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1813 | * unsigned char *phase, int *count, unsigned char **data) | |
1814 | * | |
1815 | * Purpose : transfers data in given phase using either real | |
1816 | * or pseudo DMA. | |
1817 | * | |
1818 | * Inputs : instance - instance of driver, *phase - pointer to | |
1819 | * what phase is expected, *count - pointer to number of | |
1820 | * bytes to transfer, **data - pointer to data pointer. | |
1821 | * | |
1822 | * Returns : -1 when different phase is entered without transferring | |
25985edc | 1823 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1824 | * is in same phase. |
1825 | * | |
1826 | * Also, *phase, *count, *data are modified in place. | |
1827 | * | |
1828 | */ | |
1829 | ||
1830 | ||
1831 | static int NCR5380_transfer_dma( struct Scsi_Host *instance, | |
1832 | unsigned char *phase, int *count, | |
1833 | unsigned char **data) | |
1834 | { | |
1835 | SETUP_HOSTDATA(instance); | |
1836 | register int c = *count; | |
1837 | register unsigned char p = *phase; | |
1838 | unsigned long flags; | |
1839 | ||
1840 | /* sanity check */ | |
1841 | if(!sun3_dma_setup_done) { | |
1842 | printk("scsi%d: transfer_dma without setup!\n", HOSTNO); | |
1843 | BUG(); | |
1844 | } | |
1845 | hostdata->dma_len = c; | |
1846 | ||
d65e634a | 1847 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
1da177e4 LT |
1848 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1849 | c, (p & SR_IO) ? "to" : "from", *data); | |
1850 | ||
1851 | /* netbsd turns off ints here, why not be safe and do it too */ | |
1852 | local_irq_save(flags); | |
1853 | ||
1854 | /* send start chain */ | |
1855 | sun3scsi_dma_start(c, *data); | |
1856 | ||
1857 | if (p & SR_IO) { | |
1858 | NCR5380_write(TARGET_COMMAND_REG, 1); | |
1859 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1860 | NCR5380_write(INITIATOR_COMMAND_REG, 0); | |
1861 | NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1862 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1863 | } else { | |
1864 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1865 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1866 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); | |
1867 | NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1868 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1869 | } | |
1870 | ||
1871 | #ifdef SUN3_SCSI_VME | |
1872 | dregs->csr |= CSR_DMA_ENABLE; | |
1873 | #endif | |
1874 | ||
1875 | local_irq_restore(flags); | |
1876 | ||
1877 | sun3_dma_active = 1; | |
1878 | return 0; | |
1879 | } | |
1880 | #endif /* defined(REAL_DMA) */ | |
1881 | ||
1882 | /* | |
1883 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1884 | * | |
1885 | * Purpose : run through the various SCSI phases and do as the target | |
1886 | * directs us to. Operates on the currently connected command, | |
1887 | * instance->connected. | |
1888 | * | |
1889 | * Inputs : instance, instance for which we are doing commands | |
1890 | * | |
1891 | * Side effects : SCSI things happen, the disconnected queue will be | |
1892 | * modified if a command disconnects, *instance->connected will | |
1893 | * change. | |
1894 | * | |
1895 | * XXX Note : we need to watch for bus free or a reset condition here | |
1896 | * to recover from an unexpected bus free condition. | |
1897 | */ | |
1898 | ||
1899 | static void NCR5380_information_transfer (struct Scsi_Host *instance) | |
1900 | { | |
1901 | SETUP_HOSTDATA(instance); | |
1902 | unsigned long flags; | |
1903 | unsigned char msgout = NOP; | |
1904 | int sink = 0; | |
1905 | int len; | |
1906 | #if defined(REAL_DMA) | |
1907 | int transfersize; | |
1908 | #endif | |
1909 | unsigned char *data; | |
1910 | unsigned char phase, tmp, extended_msg[10], old_phase=0xff; | |
811c9366 | 1911 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
1da177e4 LT |
1912 | |
1913 | #ifdef SUN3_SCSI_VME | |
1914 | dregs->csr |= CSR_INTR; | |
1915 | #endif | |
1916 | ||
1917 | while (1) { | |
1918 | tmp = NCR5380_read(STATUS_REG); | |
1919 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1920 | if (tmp & SR_REQ) { | |
1921 | phase = (tmp & PHASE_MASK); | |
1922 | if (phase != old_phase) { | |
1923 | old_phase = phase; | |
8ad3a593 | 1924 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
1da177e4 LT |
1925 | } |
1926 | ||
1927 | if(phase == PHASE_CMDOUT) { | |
1928 | void *d; | |
1929 | unsigned long count; | |
1930 | ||
1931 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1932 | count = cmd->SCp.buffer->length; | |
1933 | d = SGADDR(cmd->SCp.buffer); | |
1934 | } else { | |
1935 | count = cmd->SCp.this_residual; | |
1936 | d = cmd->SCp.ptr; | |
1937 | } | |
1938 | #ifdef REAL_DMA | |
1939 | /* this command setup for dma yet? */ | |
1940 | if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done | |
1941 | != cmd)) | |
1942 | { | |
33659ebb | 1943 | if (cmd->request->cmd_type == REQ_TYPE_FS) { |
1da177e4 LT |
1944 | sun3scsi_dma_setup(d, count, |
1945 | rq_data_dir(cmd->request)); | |
1946 | sun3_dma_setup_done = cmd; | |
1947 | } | |
1948 | } | |
1949 | #endif | |
1950 | #ifdef SUN3_SCSI_VME | |
1951 | dregs->csr |= CSR_INTR; | |
1952 | #endif | |
1953 | } | |
1954 | ||
1955 | ||
1956 | if (sink && (phase != PHASE_MSGOUT)) { | |
1957 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1958 | ||
1959 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1960 | ICR_ASSERT_ACK); | |
1961 | while (NCR5380_read(STATUS_REG) & SR_REQ); | |
1962 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1963 | ICR_ASSERT_ATN); | |
1964 | sink = 0; | |
1965 | continue; | |
1966 | } | |
1967 | ||
1968 | switch (phase) { | |
1969 | case PHASE_DATAOUT: | |
1970 | #if (NDEBUG & NDEBUG_NO_DATAOUT) | |
1971 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " | |
1972 | "aborted\n", HOSTNO); | |
1973 | sink = 1; | |
1974 | do_abort(instance); | |
1975 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1976 | cmd->scsi_done(cmd); |
1da177e4 LT |
1977 | return; |
1978 | #endif | |
1979 | case PHASE_DATAIN: | |
1980 | /* | |
1981 | * If there is no room left in the current buffer in the | |
1982 | * scatter-gather list, move onto the next one. | |
1983 | */ | |
1984 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1985 | ++cmd->SCp.buffer; | |
1986 | --cmd->SCp.buffers_residual; | |
1987 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
1988 | cmd->SCp.ptr = SGADDR(cmd->SCp.buffer); | |
d65e634a | 1989 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
1da177e4 LT |
1990 | HOSTNO, cmd->SCp.this_residual, |
1991 | cmd->SCp.buffers_residual); | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * The preferred transfer method is going to be | |
1996 | * PSEUDO-DMA for systems that are strictly PIO, | |
1997 | * since we can let the hardware do the handshaking. | |
1998 | * | |
1999 | * For this to work, we need to know the transfersize | |
2000 | * ahead of time, since the pseudo-DMA code will sit | |
2001 | * in an unconditional loop. | |
2002 | */ | |
2003 | ||
2004 | /* ++roman: I suggest, this should be | |
2005 | * #if def(REAL_DMA) | |
2006 | * instead of leaving REAL_DMA out. | |
2007 | */ | |
2008 | ||
2009 | #if defined(REAL_DMA) | |
2010 | // if (!cmd->device->borken && | |
2011 | if((transfersize = | |
2012 | NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) { | |
2013 | len = transfersize; | |
2014 | cmd->SCp.phase = phase; | |
2015 | ||
2016 | if (NCR5380_transfer_dma(instance, &phase, | |
2017 | &len, (unsigned char **) &cmd->SCp.ptr)) { | |
2018 | /* | |
2019 | * If the watchdog timer fires, all future | |
2020 | * accesses to this device will use the | |
2021 | * polled-IO. */ | |
2022 | printk(KERN_NOTICE "scsi%d: switching target %d " | |
2023 | "lun %d to slow handshake\n", HOSTNO, | |
2024 | cmd->device->id, cmd->device->lun); | |
2025 | cmd->device->borken = 1; | |
2026 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2027 | ICR_ASSERT_ATN); | |
2028 | sink = 1; | |
2029 | do_abort(instance); | |
2030 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2031 | cmd->scsi_done(cmd); |
1da177e4 LT |
2032 | /* XXX - need to source or sink data here, as appropriate */ |
2033 | } else { | |
2034 | #ifdef REAL_DMA | |
2035 | /* ++roman: When using real DMA, | |
2036 | * information_transfer() should return after | |
2037 | * starting DMA since it has nothing more to | |
2038 | * do. | |
2039 | */ | |
2040 | return; | |
2041 | #else | |
2042 | cmd->SCp.this_residual -= transfersize - len; | |
2043 | #endif | |
2044 | } | |
2045 | } else | |
2046 | #endif /* defined(REAL_DMA) */ | |
2047 | NCR5380_transfer_pio(instance, &phase, | |
2048 | (int *) &cmd->SCp.this_residual, (unsigned char **) | |
2049 | &cmd->SCp.ptr); | |
2050 | #ifdef REAL_DMA | |
2051 | /* if we had intended to dma that command clear it */ | |
2052 | if(sun3_dma_setup_done == cmd) | |
2053 | sun3_dma_setup_done = NULL; | |
2054 | #endif | |
2055 | ||
2056 | break; | |
2057 | case PHASE_MSGIN: | |
2058 | len = 1; | |
2059 | data = &tmp; | |
2060 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2061 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2062 | cmd->SCp.Message = tmp; | |
2063 | ||
2064 | switch (tmp) { | |
2065 | /* | |
2066 | * Linking lets us reduce the time required to get the | |
2067 | * next command out to the device, hopefully this will | |
2068 | * mean we don't waste another revolution due to the delays | |
2069 | * required by ARBITRATION and another SELECTION. | |
2070 | * | |
2071 | * In the current implementation proposal, low level drivers | |
2072 | * merely have to start the next command, pointed to by | |
2073 | * next_link, done() is called as with unlinked commands. | |
2074 | */ | |
2075 | #ifdef LINKED | |
2076 | case LINKED_CMD_COMPLETE: | |
2077 | case LINKED_FLG_CMD_COMPLETE: | |
2078 | /* Accept message by clearing ACK */ | |
2079 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2080 | ||
d65e634a | 2081 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked command " |
1da177e4 LT |
2082 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
2083 | ||
2084 | /* Enable reselect interrupts */ | |
2085 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2086 | /* | |
2087 | * Sanity check : A linked command should only terminate | |
2088 | * with one of these messages if there are more linked | |
2089 | * commands available. | |
2090 | */ | |
2091 | ||
2092 | if (!cmd->next_link) { | |
2093 | printk(KERN_NOTICE "scsi%d: target %d lun %d " | |
2094 | "linked command complete, no next_link\n", | |
2095 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2096 | sink = 1; | |
2097 | do_abort (instance); | |
2098 | return; | |
2099 | } | |
2100 | ||
2101 | initialize_SCp(cmd->next_link); | |
2102 | /* The next command is still part of this process; copy it | |
2103 | * and don't free it! */ | |
2104 | cmd->next_link->tag = cmd->tag; | |
2105 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
d65e634a | 2106 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked request " |
1da177e4 LT |
2107 | "done, calling scsi_done().\n", |
2108 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2109 | #ifdef NCR5380_STATS | |
2110 | collect_stats(hostdata, cmd); | |
2111 | #endif | |
2112 | cmd->scsi_done(cmd); | |
2113 | cmd = hostdata->connected; | |
2114 | break; | |
2115 | #endif /* def LINKED */ | |
2116 | case ABORT: | |
2117 | case COMMAND_COMPLETE: | |
2118 | /* Accept message by clearing ACK */ | |
2119 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2120 | hostdata->connected = NULL; | |
d65e634a | 2121 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %d " |
1da177e4 LT |
2122 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
2123 | #ifdef SUPPORT_TAGS | |
2124 | cmd_free_tag( cmd ); | |
2125 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
2126 | /* Turn a QUEUE FULL status into BUSY, I think the | |
2127 | * mid level cannot handle QUEUE FULL :-( (The | |
2128 | * command is retried after BUSY). Also update our | |
2129 | * queue size to the number of currently issued | |
2130 | * commands now. | |
2131 | */ | |
2132 | /* ++Andreas: the mid level code knows about | |
2133 | QUEUE_FULL now. */ | |
2134 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
d65e634a | 2135 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d returned " |
1da177e4 LT |
2136 | "QUEUE_FULL after %d commands\n", |
2137 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2138 | ta->nr_allocated); | |
2139 | if (ta->queue_size > ta->nr_allocated) | |
2140 | ta->nr_allocated = ta->queue_size; | |
2141 | } | |
2142 | #else | |
2143 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
2144 | #endif | |
2145 | /* Enable reselect interrupts */ | |
2146 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2147 | ||
2148 | /* | |
2149 | * I'm not sure what the correct thing to do here is : | |
2150 | * | |
2151 | * If the command that just executed is NOT a request | |
2152 | * sense, the obvious thing to do is to set the result | |
2153 | * code to the values of the stored parameters. | |
2154 | * | |
2155 | * If it was a REQUEST SENSE command, we need some way to | |
2156 | * differentiate between the failure code of the original | |
2157 | * and the failure code of the REQUEST sense - the obvious | |
2158 | * case is success, where we fall through and leave the | |
2159 | * result code unchanged. | |
2160 | * | |
2161 | * The non-obvious place is where the REQUEST SENSE failed | |
2162 | */ | |
2163 | ||
2164 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2165 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2166 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2167 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
2168 | ||
2169 | #ifdef AUTOSENSE | |
28424d3a BH |
2170 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2171 | hostdata->ses.cmd_len) { | |
2172 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2173 | hostdata->ses.cmd_len = 0 ; | |
2174 | } | |
2175 | ||
1da177e4 LT |
2176 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2177 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a | 2178 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
d65e634a | 2179 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", |
1da177e4 | 2180 | HOSTNO); |
1da177e4 LT |
2181 | /* this is initialized from initialize_SCp |
2182 | cmd->SCp.buffer = NULL; | |
2183 | cmd->SCp.buffers_residual = 0; | |
2184 | */ | |
1da177e4 LT |
2185 | |
2186 | local_irq_save(flags); | |
2187 | LIST(cmd,hostdata->issue_queue); | |
a5cb67f7 | 2188 | SET_NEXT(cmd, hostdata->issue_queue); |
811c9366 | 2189 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
1da177e4 | 2190 | local_irq_restore(flags); |
d65e634a | 2191 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
1da177e4 LT |
2192 | "issue queue\n", H_NO(cmd)); |
2193 | } else | |
2194 | #endif /* def AUTOSENSE */ | |
2195 | { | |
2196 | #ifdef NCR5380_STATS | |
2197 | collect_stats(hostdata, cmd); | |
2198 | #endif | |
2199 | cmd->scsi_done(cmd); | |
2200 | } | |
2201 | ||
2202 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2203 | /* | |
2204 | * Restore phase bits to 0 so an interrupted selection, | |
2205 | * arbitration can resume. | |
2206 | */ | |
2207 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2208 | ||
2209 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2210 | barrier(); | |
2211 | ||
2212 | return; | |
2213 | case MESSAGE_REJECT: | |
2214 | /* Accept message by clearing ACK */ | |
2215 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2216 | /* Enable reselect interrupts */ | |
2217 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2218 | switch (hostdata->last_message) { | |
2219 | case HEAD_OF_QUEUE_TAG: | |
2220 | case ORDERED_QUEUE_TAG: | |
2221 | case SIMPLE_QUEUE_TAG: | |
2222 | /* The target obviously doesn't support tagged | |
2223 | * queuing, even though it announced this ability in | |
2224 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2225 | * clear 'tagged_supported' and lock the LUN, since | |
2226 | * the command is treated as untagged further on. | |
2227 | */ | |
2228 | cmd->device->tagged_supported = 0; | |
2229 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2230 | cmd->tag = TAG_NONE; | |
d65e634a | 2231 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d rejected " |
1da177e4 LT |
2232 | "QUEUE_TAG message; tagged queuing " |
2233 | "disabled\n", | |
2234 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2235 | break; | |
2236 | } | |
2237 | break; | |
2238 | case DISCONNECT: | |
2239 | /* Accept message by clearing ACK */ | |
2240 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2241 | local_irq_save(flags); | |
2242 | cmd->device->disconnect = 1; | |
2243 | LIST(cmd,hostdata->disconnected_queue); | |
a5cb67f7 | 2244 | SET_NEXT(cmd, hostdata->disconnected_queue); |
1da177e4 LT |
2245 | hostdata->connected = NULL; |
2246 | hostdata->disconnected_queue = cmd; | |
2247 | local_irq_restore(flags); | |
d65e634a | 2248 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %d was " |
1da177e4 LT |
2249 | "moved from connected to the " |
2250 | "disconnected_queue\n", HOSTNO, | |
2251 | cmd->device->id, cmd->device->lun); | |
2252 | /* | |
2253 | * Restore phase bits to 0 so an interrupted selection, | |
2254 | * arbitration can resume. | |
2255 | */ | |
2256 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2257 | ||
2258 | /* Enable reselect interrupts */ | |
2259 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2260 | /* Wait for bus free to avoid nasty timeouts */ | |
2261 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2262 | barrier(); | |
2263 | #ifdef SUN3_SCSI_VME | |
2264 | dregs->csr |= CSR_DMA_ENABLE; | |
2265 | #endif | |
2266 | return; | |
2267 | /* | |
2268 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2269 | * operation, in violation of the SCSI spec so we can safely | |
2270 | * ignore SAVE/RESTORE pointers calls. | |
2271 | * | |
2272 | * Unfortunately, some disks violate the SCSI spec and | |
2273 | * don't issue the required SAVE_POINTERS message before | |
2274 | * disconnecting, and we have to break spec to remain | |
2275 | * compatible. | |
2276 | */ | |
2277 | case SAVE_POINTERS: | |
2278 | case RESTORE_POINTERS: | |
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 | break; | |
2284 | case EXTENDED_MESSAGE: | |
2285 | /* | |
2286 | * Extended messages are sent in the following format : | |
2287 | * Byte | |
2288 | * 0 EXTENDED_MESSAGE == 1 | |
2289 | * 1 length (includes one byte for code, doesn't | |
2290 | * include first two bytes) | |
2291 | * 2 code | |
2292 | * 3..length+1 arguments | |
2293 | * | |
2294 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
1abfd370 | 2295 | * byte, since spi_print_msg() wants the whole thing. |
1da177e4 LT |
2296 | */ |
2297 | extended_msg[0] = EXTENDED_MESSAGE; | |
2298 | /* Accept first byte by clearing ACK */ | |
2299 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2300 | ||
d65e634a | 2301 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
1da177e4 LT |
2302 | |
2303 | len = 2; | |
2304 | data = extended_msg + 1; | |
2305 | phase = PHASE_MSGIN; | |
2306 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2307 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
1da177e4 LT |
2308 | (int)extended_msg[1], (int)extended_msg[2]); |
2309 | ||
2310 | if (!len && extended_msg[1] <= | |
2311 | (sizeof (extended_msg) - 1)) { | |
2312 | /* Accept third byte by clearing ACK */ | |
2313 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2314 | len = extended_msg[1] - 1; | |
2315 | data = extended_msg + 3; | |
2316 | phase = PHASE_MSGIN; | |
2317 | ||
2318 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2319 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
1da177e4 LT |
2320 | HOSTNO, len); |
2321 | ||
2322 | switch (extended_msg[2]) { | |
2323 | case EXTENDED_SDTR: | |
2324 | case EXTENDED_WDTR: | |
2325 | case EXTENDED_MODIFY_DATA_POINTER: | |
2326 | case EXTENDED_EXTENDED_IDENTIFY: | |
2327 | tmp = 0; | |
2328 | } | |
2329 | } else if (len) { | |
2330 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2331 | "extended message\n", HOSTNO); | |
2332 | tmp = 0; | |
2333 | } else { | |
2334 | printk(KERN_NOTICE "scsi%d: extended message " | |
2335 | "code %02x length %d is too long\n", | |
2336 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2337 | tmp = 0; | |
2338 | } | |
2339 | /* Fall through to reject message */ | |
2340 | ||
2341 | /* | |
2342 | * If we get something weird that we aren't expecting, | |
2343 | * reject it. | |
2344 | */ | |
2345 | default: | |
2346 | if (!tmp) { | |
2347 | printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); | |
1abfd370 | 2348 | spi_print_msg(extended_msg); |
1da177e4 LT |
2349 | printk("\n"); |
2350 | } else if (tmp != EXTENDED_MESSAGE) | |
2351 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
2352 | "message %02x from target %d, lun %d\n", | |
2353 | HOSTNO, tmp, cmd->device->id, cmd->device->lun); | |
2354 | else | |
2355 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
2356 | "extended message " | |
2357 | "code %02x, length %d from target %d, lun %d\n", | |
2358 | HOSTNO, extended_msg[1], extended_msg[0], | |
2359 | cmd->device->id, cmd->device->lun); | |
2360 | ||
2361 | ||
2362 | msgout = MESSAGE_REJECT; | |
2363 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2364 | ICR_ASSERT_ATN); | |
2365 | break; | |
2366 | } /* switch (tmp) */ | |
2367 | break; | |
2368 | case PHASE_MSGOUT: | |
2369 | len = 1; | |
2370 | data = &msgout; | |
2371 | hostdata->last_message = msgout; | |
2372 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2373 | if (msgout == ABORT) { | |
2374 | #ifdef SUPPORT_TAGS | |
2375 | cmd_free_tag( cmd ); | |
2376 | #else | |
2377 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
2378 | #endif | |
2379 | hostdata->connected = NULL; | |
2380 | cmd->result = DID_ERROR << 16; | |
2381 | #ifdef NCR5380_STATS | |
2382 | collect_stats(hostdata, cmd); | |
2383 | #endif | |
2384 | cmd->scsi_done(cmd); | |
2385 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2386 | return; | |
2387 | } | |
2388 | msgout = NOP; | |
2389 | break; | |
2390 | case PHASE_CMDOUT: | |
2391 | len = cmd->cmd_len; | |
2392 | data = cmd->cmnd; | |
2393 | /* | |
2394 | * XXX for performance reasons, on machines with a | |
2395 | * PSEUDO-DMA architecture we should probably | |
2396 | * use the dma transfer function. | |
2397 | */ | |
2398 | NCR5380_transfer_pio(instance, &phase, &len, | |
2399 | &data); | |
2400 | break; | |
2401 | case PHASE_STATIN: | |
2402 | len = 1; | |
2403 | data = &tmp; | |
2404 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2405 | cmd->SCp.Status = tmp; | |
2406 | break; | |
2407 | default: | |
2408 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2409 | NCR5380_dprint(NDEBUG_ANY, instance); |
1da177e4 LT |
2410 | } /* switch(phase) */ |
2411 | } /* if (tmp * SR_REQ) */ | |
2412 | } /* while (1) */ | |
2413 | } | |
2414 | ||
2415 | /* | |
2416 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2417 | * | |
2418 | * Purpose : does reselection, initializing the instance->connected | |
811c9366 | 2419 | * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 LT |
2420 | * nexus has been reestablished, |
2421 | * | |
2422 | * Inputs : instance - this instance of the NCR5380. | |
2423 | * | |
2424 | */ | |
2425 | ||
2426 | /* it might eventually prove necessary to do a dma setup on | |
2427 | reselection, but it doesn't seem to be needed now -- sam */ | |
2428 | ||
2429 | static void NCR5380_reselect (struct Scsi_Host *instance) | |
2430 | { | |
2431 | SETUP_HOSTDATA(instance); | |
2432 | unsigned char target_mask; | |
2433 | unsigned char lun; | |
2434 | #ifdef SUPPORT_TAGS | |
2435 | unsigned char tag; | |
2436 | #endif | |
2437 | unsigned char msg[3]; | |
811c9366 | 2438 | struct scsi_cmnd *tmp = NULL, *prev; |
1da177e4 LT |
2439 | /* unsigned long flags; */ |
2440 | ||
2441 | /* | |
2442 | * Disable arbitration, etc. since the host adapter obviously | |
2443 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2444 | */ | |
2445 | ||
2446 | NCR5380_write(MODE_REG, MR_BASE); | |
2447 | hostdata->restart_select = 1; | |
2448 | ||
2449 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2450 | ||
d65e634a | 2451 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
1da177e4 LT |
2452 | |
2453 | /* | |
2454 | * At this point, we have detected that our SCSI ID is on the bus, | |
2455 | * SEL is true and BSY was false for at least one bus settle delay | |
2456 | * (400 ns). | |
2457 | * | |
2458 | * We must assert BSY ourselves, until the target drops the SEL | |
2459 | * signal. | |
2460 | */ | |
2461 | ||
2462 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2463 | ||
2464 | while (NCR5380_read(STATUS_REG) & SR_SEL); | |
2465 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2466 | ||
2467 | /* | |
2468 | * Wait for target to go into MSGIN. | |
2469 | */ | |
2470 | ||
2471 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); | |
2472 | ||
2473 | #if 1 | |
2474 | // acknowledge toggle to MSGIN | |
2475 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2476 | ||
2477 | // peek at the byte without really hitting the bus | |
2478 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2479 | #endif | |
2480 | ||
2481 | if (!(msg[0] & 0x80)) { | |
2482 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | |
1abfd370 | 2483 | spi_print_msg(msg); |
1da177e4 LT |
2484 | do_abort(instance); |
2485 | return; | |
2486 | } | |
2487 | lun = (msg[0] & 0x07); | |
2488 | ||
2489 | /* | |
2490 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2491 | * just reestablished, and remove it from the disconnected queue. | |
2492 | */ | |
2493 | ||
811c9366 | 2494 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
1da177e4 LT |
2495 | tmp; prev = tmp, tmp = NEXT(tmp) ) { |
2496 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
2497 | #ifdef SUPPORT_TAGS | |
2498 | && (tag == tmp->tag) | |
2499 | #endif | |
2500 | ) { | |
2501 | if (prev) { | |
2502 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
a5cb67f7 | 2503 | SET_NEXT(prev, NEXT(tmp)); |
1da177e4 LT |
2504 | } else { |
2505 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2506 | hostdata->disconnected_queue = NEXT(tmp); | |
2507 | } | |
a5cb67f7 | 2508 | SET_NEXT(tmp, NULL); |
1da177e4 LT |
2509 | break; |
2510 | } | |
2511 | } | |
2512 | ||
2513 | if (!tmp) { | |
2514 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | |
2515 | #ifdef SUPPORT_TAGS | |
2516 | "tag %d " | |
2517 | #endif | |
2518 | "not in disconnected_queue.\n", | |
2519 | HOSTNO, target_mask, lun | |
2520 | #ifdef SUPPORT_TAGS | |
2521 | , tag | |
2522 | #endif | |
2523 | ); | |
2524 | /* | |
2525 | * Since we have an established nexus that we can't do anything | |
2526 | * with, we must abort it. | |
2527 | */ | |
2528 | do_abort(instance); | |
2529 | return; | |
2530 | } | |
2531 | #if 1 | |
2532 | /* engage dma setup for the command we just saw */ | |
2533 | { | |
2534 | void *d; | |
2535 | unsigned long count; | |
2536 | ||
2537 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2538 | count = tmp->SCp.buffer->length; | |
2539 | d = SGADDR(tmp->SCp.buffer); | |
2540 | } else { | |
2541 | count = tmp->SCp.this_residual; | |
2542 | d = tmp->SCp.ptr; | |
2543 | } | |
2544 | #ifdef REAL_DMA | |
2545 | /* setup this command for dma if not already */ | |
2546 | if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp)) | |
2547 | { | |
2548 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2549 | sun3_dma_setup_done = tmp; | |
2550 | } | |
2551 | #endif | |
2552 | } | |
2553 | #endif | |
2554 | ||
2555 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2556 | /* Accept message by clearing ACK */ | |
2557 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2558 | ||
2559 | #ifdef SUPPORT_TAGS | |
2560 | /* If the phase is still MSGIN, the target wants to send some more | |
2561 | * messages. In case it supports tagged queuing, this is probably a | |
2562 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2563 | */ | |
2564 | tag = TAG_NONE; | |
2565 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2566 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2567 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); | |
2568 | len = 2; | |
2569 | data = msg+1; | |
2570 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2571 | msg[1] == SIMPLE_QUEUE_TAG) | |
2572 | tag = msg[2]; | |
d65e634a | 2573 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
1da177e4 LT |
2574 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2575 | } | |
2576 | #endif | |
2577 | ||
2578 | hostdata->connected = tmp; | |
d65e634a | 2579 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", |
4dde8f7d | 2580 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2581 | } |
2582 | ||
2583 | ||
2584 | /* | |
811c9366 | 2585 | * Function : int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 LT |
2586 | * |
2587 | * Purpose : abort a command | |
2588 | * | |
811c9366 | 2589 | * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the |
1da177e4 LT |
2590 | * host byte of the result field to, if zero DID_ABORTED is |
2591 | * used. | |
2592 | * | |
2593 | * Returns : 0 - success, -1 on failure. | |
2594 | * | |
2595 | * XXX - there is no way to abort the command that is currently | |
2596 | * connected, you have to wait for it to complete. If this is | |
2597 | * a problem, we could implement longjmp() / setjmp(), setjmp() | |
2598 | * called where the loop started in NCR5380_main(). | |
2599 | */ | |
2600 | ||
811c9366 | 2601 | static int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 LT |
2602 | { |
2603 | struct Scsi_Host *instance = cmd->device->host; | |
2604 | SETUP_HOSTDATA(instance); | |
811c9366 | 2605 | struct scsi_cmnd *tmp, **prev; |
1da177e4 LT |
2606 | unsigned long flags; |
2607 | ||
2608 | printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); | |
db9dff36 | 2609 | scsi_print_command(cmd); |
1da177e4 LT |
2610 | |
2611 | NCR5380_print_status (instance); | |
2612 | ||
2613 | local_irq_save(flags); | |
2614 | ||
d65e634a | 2615 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
1da177e4 LT |
2616 | NCR5380_read(BUS_AND_STATUS_REG), |
2617 | NCR5380_read(STATUS_REG)); | |
2618 | ||
2619 | #if 1 | |
2620 | /* | |
2621 | * Case 1 : If the command is the currently executing command, | |
2622 | * we'll set the aborted flag and return control so that | |
2623 | * information transfer routine can exit cleanly. | |
2624 | */ | |
2625 | ||
2626 | if (hostdata->connected == cmd) { | |
2627 | ||
d65e634a | 2628 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
1da177e4 LT |
2629 | /* |
2630 | * We should perform BSY checking, and make sure we haven't slipped | |
2631 | * into BUS FREE. | |
2632 | */ | |
2633 | ||
2634 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ | |
2635 | /* | |
2636 | * Since we can't change phases until we've completed the current | |
2637 | * handshake, we have to source or sink a byte of data if the current | |
2638 | * phase is not MSGOUT. | |
2639 | */ | |
2640 | ||
2641 | /* | |
2642 | * Return control to the executing NCR drive so we can clear the | |
2643 | * aborted flag and get back into our main loop. | |
2644 | */ | |
2645 | ||
2646 | if (do_abort(instance) == 0) { | |
2647 | hostdata->aborted = 1; | |
2648 | hostdata->connected = NULL; | |
2649 | cmd->result = DID_ABORT << 16; | |
2650 | #ifdef SUPPORT_TAGS | |
2651 | cmd_free_tag( cmd ); | |
2652 | #else | |
2653 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
2654 | #endif | |
2655 | local_irq_restore(flags); | |
2656 | cmd->scsi_done(cmd); | |
2b0f834c | 2657 | return SUCCESS; |
1da177e4 LT |
2658 | } else { |
2659 | /* local_irq_restore(flags); */ | |
2660 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); | |
2b0f834c | 2661 | return FAILED; |
1da177e4 LT |
2662 | } |
2663 | } | |
2664 | #endif | |
2665 | ||
2666 | /* | |
2667 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2668 | * from the issue queue. | |
2669 | */ | |
811c9366 H |
2670 | for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue), |
2671 | tmp = (struct scsi_cmnd *) hostdata->issue_queue; | |
2672 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) | |
1da177e4 LT |
2673 | if (cmd == tmp) { |
2674 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2675 | (*prev) = NEXT(tmp); | |
a5cb67f7 | 2676 | SET_NEXT(tmp, NULL); |
1da177e4 LT |
2677 | tmp->result = DID_ABORT << 16; |
2678 | local_irq_restore(flags); | |
d65e634a | 2679 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
1da177e4 LT |
2680 | HOSTNO); |
2681 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2682 | * yet... */ | |
2683 | tmp->scsi_done(tmp); | |
2b0f834c | 2684 | return SUCCESS; |
1da177e4 LT |
2685 | } |
2686 | ||
2687 | /* | |
2688 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2689 | * and let the high level SCSI driver retry at a later time or | |
2690 | * issue a reset. | |
2691 | * | |
2692 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2693 | * and handling them cleanly in this situation would make the common | |
2694 | * case of noresets less efficient, and would pollute our code. So, | |
2695 | * we fail. | |
2696 | */ | |
2697 | ||
2698 | if (hostdata->connected) { | |
2699 | local_irq_restore(flags); | |
d65e634a | 2700 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2701 | return FAILED; |
1da177e4 LT |
2702 | } |
2703 | ||
2704 | /* | |
2705 | * Case 4: If the command is currently disconnected from the bus, and | |
2706 | * there are no connected commands, we reconnect the I_T_L or | |
2707 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2708 | * an abort message. | |
2709 | * | |
2710 | * This case is especially ugly. In order to reestablish the nexus, we | |
2711 | * need to call NCR5380_select(). The easiest way to implement this | |
2712 | * function was to abort if the bus was busy, and let the interrupt | |
2713 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2714 | * where necessary, meaning interrupts need to be enabled. | |
2715 | * | |
2716 | * When interrupts are enabled, the queues may change - so we | |
2717 | * can't remove it from the disconnected queue before selecting it | |
2718 | * because that could cause a failure in hashing the nexus if that | |
2719 | * device reselected. | |
2720 | * | |
2721 | * Since the queues may change, we can't use the pointers from when we | |
2722 | * first locate it. | |
2723 | * | |
2724 | * So, we must first locate the command, and if NCR5380_select() | |
2725 | * succeeds, then issue the abort, relocate the command and remove | |
2726 | * it from the disconnected queue. | |
2727 | */ | |
2728 | ||
811c9366 | 2729 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
1da177e4 LT |
2730 | tmp = NEXT(tmp)) |
2731 | if (cmd == tmp) { | |
2732 | local_irq_restore(flags); | |
d65e634a | 2733 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
1da177e4 LT |
2734 | |
2735 | if (NCR5380_select (instance, cmd, (int) cmd->tag)) | |
2b0f834c | 2736 | return FAILED; |
1da177e4 | 2737 | |
d65e634a | 2738 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
1da177e4 LT |
2739 | |
2740 | do_abort (instance); | |
2741 | ||
2742 | local_irq_save(flags); | |
811c9366 H |
2743 | for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue), |
2744 | tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; | |
1da177e4 LT |
2745 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) |
2746 | if (cmd == tmp) { | |
2747 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2748 | *prev = NEXT(tmp); | |
a5cb67f7 | 2749 | SET_NEXT(tmp, NULL); |
1da177e4 LT |
2750 | tmp->result = DID_ABORT << 16; |
2751 | /* We must unlock the tag/LUN immediately here, since the | |
2752 | * target goes to BUS FREE and doesn't send us another | |
2753 | * message (COMMAND_COMPLETE or the like) | |
2754 | */ | |
2755 | #ifdef SUPPORT_TAGS | |
2756 | cmd_free_tag( tmp ); | |
2757 | #else | |
2758 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
2759 | #endif | |
2760 | local_irq_restore(flags); | |
2761 | tmp->scsi_done(tmp); | |
2b0f834c | 2762 | return SUCCESS; |
1da177e4 LT |
2763 | } |
2764 | } | |
2765 | ||
2766 | /* | |
2767 | * Case 5 : If we reached this point, the command was not found in any of | |
2768 | * the queues. | |
2769 | * | |
2770 | * We probably reached this point because of an unlikely race condition | |
2771 | * between the command completing successfully and the abortion code, | |
2772 | * so we won't panic, but we will notify the user in case something really | |
2773 | * broke. | |
2774 | */ | |
2775 | ||
2776 | local_irq_restore(flags); | |
ad361c98 | 2777 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2778 | |
2b0f834c | 2779 | return FAILED; |
1da177e4 LT |
2780 | } |
2781 | ||
2782 | ||
2783 | /* | |
811c9366 | 2784 | * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
2785 | * |
2786 | * Purpose : reset the SCSI bus. | |
2787 | * | |
2b0f834c | 2788 | * Returns : SUCCESS or FAILURE |
1da177e4 LT |
2789 | * |
2790 | */ | |
2791 | ||
811c9366 | 2792 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 LT |
2793 | { |
2794 | SETUP_HOSTDATA(cmd->device->host); | |
2795 | int i; | |
2796 | unsigned long flags; | |
2b0f834c | 2797 | #if defined(RESET_RUN_DONE) |
811c9366 | 2798 | struct scsi_cmnd *connected, *disconnected_queue; |
1da177e4 LT |
2799 | #endif |
2800 | ||
2801 | ||
2802 | NCR5380_print_status (cmd->device->host); | |
2803 | ||
2804 | /* get in phase */ | |
2805 | NCR5380_write( TARGET_COMMAND_REG, | |
2806 | PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); | |
2807 | /* assert RST */ | |
2808 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); | |
2809 | udelay (40); | |
2810 | /* reset NCR registers */ | |
2811 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); | |
2812 | NCR5380_write( MODE_REG, MR_BASE ); | |
2813 | NCR5380_write( TARGET_COMMAND_REG, 0 ); | |
2814 | NCR5380_write( SELECT_ENABLE_REG, 0 ); | |
2815 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get | |
2816 | * through anymore ... */ | |
2817 | (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG ); | |
2818 | ||
2b0f834c MS |
2819 | /* MSch 20140115 - looking at the generic NCR5380 driver, all of this |
2820 | * should go. | |
2821 | * Catch-22: if we don't clear all queues, the SCSI driver lock will | |
2822 | * not be released by atari_scsi_reset()! | |
2823 | */ | |
2824 | ||
2825 | #if defined(RESET_RUN_DONE) | |
2826 | /* XXX Should now be done by midlevel code, but it's broken XXX */ | |
2827 | /* XXX see below XXX */ | |
1da177e4 LT |
2828 | |
2829 | /* MSch: old-style reset: actually abort all command processing here */ | |
2830 | ||
2831 | /* After the reset, there are no more connected or disconnected commands | |
2832 | * and no busy units; to avoid problems with re-inserting the commands | |
2833 | * into the issue_queue (via scsi_done()), the aborted commands are | |
2834 | * remembered in local variables first. | |
2835 | */ | |
2836 | local_irq_save(flags); | |
811c9366 | 2837 | connected = (struct scsi_cmnd *)hostdata->connected; |
1da177e4 | 2838 | hostdata->connected = NULL; |
811c9366 | 2839 | disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue; |
1da177e4 LT |
2840 | hostdata->disconnected_queue = NULL; |
2841 | #ifdef SUPPORT_TAGS | |
2842 | free_all_tags(); | |
2843 | #endif | |
2844 | for( i = 0; i < 8; ++i ) | |
2845 | hostdata->busy[i] = 0; | |
2846 | #ifdef REAL_DMA | |
2847 | hostdata->dma_len = 0; | |
2848 | #endif | |
2849 | local_irq_restore(flags); | |
2850 | ||
2851 | /* In order to tell the mid-level code which commands were aborted, | |
2852 | * set the command status to DID_RESET and call scsi_done() !!! | |
2853 | * This ultimately aborts processing of these commands in the mid-level. | |
2854 | */ | |
2855 | ||
2856 | if ((cmd = connected)) { | |
d65e634a | 2857 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
1da177e4 LT |
2858 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2859 | cmd->scsi_done( cmd ); | |
2860 | } | |
2861 | ||
2862 | for (i = 0; (cmd = disconnected_queue); ++i) { | |
2863 | disconnected_queue = NEXT(cmd); | |
a5cb67f7 | 2864 | SET_NEXT(cmd, NULL); |
1da177e4 LT |
2865 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2866 | cmd->scsi_done( cmd ); | |
2867 | } | |
2868 | if (i > 0) | |
d65e634a | 2869 | dprintk(NDEBUG_ABORT, "scsi: reset aborted %d disconnected command(s)\n", i); |
1da177e4 LT |
2870 | |
2871 | ||
2872 | /* since all commands have been explicitly terminated, we need to tell | |
2873 | * the midlevel code that the reset was SUCCESSFUL, and there is no | |
2874 | * need to 'wake up' the commands by a request_sense | |
2875 | */ | |
2b0f834c | 2876 | return SUCCESS; |
1da177e4 LT |
2877 | #else /* 1 */ |
2878 | ||
2879 | /* MSch: new-style reset handling: let the mid-level do what it can */ | |
2880 | ||
2881 | /* ++guenther: MID-LEVEL IS STILL BROKEN. | |
2882 | * Mid-level is supposed to requeue all commands that were active on the | |
2883 | * various low-level queues. In fact it does this, but that's not enough | |
2884 | * because all these commands are subject to timeout. And if a timeout | |
2885 | * happens for any removed command, *_abort() is called but all queues | |
2886 | * are now empty. Abort then gives up the falcon lock, which is fatal, | |
2887 | * since the mid-level will queue more commands and must have the lock | |
2888 | * (it's all happening inside timer interrupt handler!!). | |
2889 | * Even worse, abort will return NOT_RUNNING for all those commands not | |
2890 | * on any queue, so they won't be retried ... | |
2891 | * | |
2892 | * Conclusion: either scsi.c disables timeout for all resetted commands | |
2893 | * immediately, or we lose! As of linux-2.0.20 it doesn't. | |
2894 | */ | |
2895 | ||
2896 | /* After the reset, there are no more connected or disconnected commands | |
2897 | * and no busy units; so clear the low-level status here to avoid | |
2898 | * conflicts when the mid-level code tries to wake up the affected | |
2899 | * commands! | |
2900 | */ | |
2901 | ||
2902 | if (hostdata->issue_queue) | |
d65e634a | 2903 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
1da177e4 | 2904 | if (hostdata->connected) |
d65e634a | 2905 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
1da177e4 | 2906 | if (hostdata->disconnected_queue) |
d65e634a | 2907 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
1da177e4 LT |
2908 | |
2909 | local_irq_save(flags); | |
2910 | hostdata->issue_queue = NULL; | |
2911 | hostdata->connected = NULL; | |
2912 | hostdata->disconnected_queue = NULL; | |
2913 | #ifdef SUPPORT_TAGS | |
2914 | free_all_tags(); | |
2915 | #endif | |
2916 | for( i = 0; i < 8; ++i ) | |
2917 | hostdata->busy[i] = 0; | |
2918 | #ifdef REAL_DMA | |
2919 | hostdata->dma_len = 0; | |
2920 | #endif | |
2921 | local_irq_restore(flags); | |
2922 | ||
2923 | /* we did no complete reset of all commands, so a wakeup is required */ | |
2b0f834c | 2924 | return SUCCESS; |
1da177e4 LT |
2925 | #endif /* 1 */ |
2926 | } | |
2927 | ||
2928 | /* Local Variables: */ | |
2929 | /* tab-width: 8 */ | |
2930 | /* End: */ |