Commit | Line | Data |
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c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * For more information, please consult |
1da177e4 LT |
15 | * |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
28 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
29 | * this file, too: | |
30 | * | |
31 | * - Some of the debug statements were incorrect (undefined variables and the | |
32 | * like). I fixed that. | |
33 | * | |
34 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
35 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
36 | * in the #if statement. | |
37 | * | |
38 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
39 | * phase after starting the DMA. It has nothing more to do. | |
40 | * | |
41 | * - The interrupt service routine should run main after end of DMA, too (not | |
42 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
43 | * for more interrupts after running main, since a DMA process may have | |
44 | * been started and interrupts are turned on now. The new int could happen | |
45 | * inside the execution of NCR5380_intr(), leading to recursive | |
46 | * calls. | |
47 | * | |
48 | * - I've added a function merge_contiguous_buffers() that tries to | |
49 | * merge scatter-gather buffers that are located at contiguous | |
50 | * physical addresses and can be processed with the same DMA setup. | |
51 | * Since most scatter-gather operations work on a page (4K) of | |
52 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
53 | * DMA setup actions are saved. | |
54 | * | |
55 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
56 | * and USLEEP, because these were messing up readability and will never be | |
57 | * needed for Atari SCSI. | |
c28bda25 | 58 | * |
1da177e4 LT |
59 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
60 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
61 | * interrupt. | |
62 | * | |
63 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
64 | * constructs. In my eyes, this made the source rather unreadable, so I | |
65 | * finally replaced that by the *_PRINTK() macros. | |
66 | * | |
67 | */ | |
68 | ||
e3f463b0 FT |
69 | /* Adapted for the sun3 by Sam Creasey. */ |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Design | |
1da177e4 | 73 | * |
c28bda25 | 74 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 75 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 76 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
77 | * memory mapped) and drops this file in their 'C' wrapper. |
78 | * | |
c28bda25 | 79 | * As far as command queueing, two queues are maintained for |
1da177e4 | 80 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
81 | * and commands that are currently executing. This means that an |
82 | * unlimited number of commands may be queued, letting | |
83 | * more commands propagate from the higher driver levels giving higher | |
84 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
85 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
86 | * while a command is already executing. |
87 | * | |
1da177e4 | 88 | * |
c28bda25 | 89 | * Issues specific to the NCR5380 : |
1da177e4 | 90 | * |
c28bda25 RZ |
91 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
92 | * piece of hardware that requires you to sit in a loop polling for | |
93 | * the REQ signal as long as you are connected. Some devices are | |
94 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 95 | * while doing long seek operations. [...] These |
1da177e4 LT |
96 | * broken devices are the exception rather than the rule and I'd rather |
97 | * spend my time optimizing for the normal case. | |
98 | * | |
99 | * Architecture : | |
100 | * | |
101 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
102 | * which is started from a workqueue for each NCR5380 host in the |
103 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
104 | * removing the commands from the issue queue and calling | |
105 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
106 | * |
107 | * Once a nexus is established, the NCR5380_information_transfer() | |
108 | * phase goes through the various phases as instructed by the target. | |
109 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
110 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
111 | * queue, and NCR5380_main tries to find more work. If the target is |
112 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
113 | * |
114 | * If a command has disconnected, eventually an interrupt will trigger, | |
115 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
116 | * to reestablish a nexus. This will run main if necessary. | |
117 | * | |
c28bda25 | 118 | * On command termination, the done function will be called as |
1da177e4 LT |
119 | * appropriate. |
120 | * | |
c28bda25 | 121 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
122 | * structures, being initialized after the command is connected |
123 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
124 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
125 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
126 | */ | |
127 | ||
128 | /* | |
129 | * Using this file : | |
130 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 131 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
132 | * and macros and include this file in your driver. |
133 | * | |
c28bda25 | 134 | * These macros control options : |
1da177e4 | 135 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 136 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 137 | * |
ff50f9ed FT |
138 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
139 | * transceivers. | |
140 | * | |
1da177e4 LT |
141 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
142 | * | |
143 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
144 | * | |
145 | * These macros MUST be defined : | |
c28bda25 | 146 | * |
1da177e4 LT |
147 | * NCR5380_read(register) - read from the specified register |
148 | * | |
c28bda25 | 149 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 150 | * |
ff50f9ed FT |
151 | * NCR5380_implementation_fields - additional fields needed for this |
152 | * specific implementation of the NCR5380 | |
153 | * | |
1da177e4 | 154 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 155 | * REAL functions : |
1da177e4 | 156 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 157 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
158 | * that they were able to program the controller for. |
159 | * | |
c28bda25 | 160 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
161 | * available as NCR5380_i386_dma_write_setup, |
162 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
163 | * | |
164 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
165 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
166 | * NCR5380_dma_residual(instance); - residual count | |
167 | * | |
168 | * PSEUDO functions : | |
169 | * NCR5380_pwrite(instance, src, count) | |
170 | * NCR5380_pread(instance, dst, count); | |
171 | * | |
1da177e4 | 172 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 173 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 174 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 175 | * possible) function may be used. |
1da177e4 LT |
176 | */ |
177 | ||
636b1ec8 FT |
178 | static int do_abort(struct Scsi_Host *); |
179 | static void do_reset(struct Scsi_Host *); | |
180 | ||
1da177e4 LT |
181 | #ifdef SUPPORT_TAGS |
182 | ||
183 | /* | |
184 | * Functions for handling tagged queuing | |
185 | * ===================================== | |
186 | * | |
187 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
188 | * | |
189 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
190 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
191 | * command has been preempted for a long time. My solution: a bitfield for | |
192 | * remembering used tags. | |
193 | * | |
194 | * There's also the problem that each target has a certain queue size, but we | |
195 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
196 | * returned. So, in this case, the driver internal queue size assumption is | |
197 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 198 | * target. |
1da177e4 LT |
199 | * |
200 | * We're also not allowed running tagged commands as long as an untagged | |
201 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
202 | * condition _must_ be untagged. To keep track whether an untagged command has | |
203 | * been issued, the host->busy array is still employed, as it is without | |
204 | * support for tagged queuing. | |
205 | * | |
206 | * One could suspect that there are possible race conditions between | |
207 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
208 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
209 | * which already guaranteed to be running at most once. It is also the only | |
210 | * place where tags/LUNs are allocated. So no other allocation can slip | |
211 | * between that pair, there could only happen a reselection, which can free a | |
212 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
213 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
214 | */ | |
215 | ||
ca513fc9 | 216 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 217 | { |
c28bda25 | 218 | int target, lun; |
61d739a4 | 219 | struct tag_alloc *ta; |
c28bda25 | 220 | |
ca513fc9 | 221 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
222 | return; |
223 | ||
224 | for (target = 0; target < 8; ++target) { | |
225 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 226 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
227 | bitmap_zero(ta->allocated, MAX_TAGS); |
228 | ta->nr_allocated = 0; | |
229 | /* At the beginning, assume the maximum queue size we could | |
230 | * support (MAX_TAGS). This value will be decreased if the target | |
231 | * returns QUEUE_FULL status. | |
232 | */ | |
233 | ta->queue_size = MAX_TAGS; | |
234 | } | |
1da177e4 | 235 | } |
1da177e4 LT |
236 | } |
237 | ||
238 | ||
239 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
240 | * busy by an untagged command. If the command should use tagged queuing, also | |
241 | * check that there is a free tag and the target's queue won't overflow. This | |
242 | * function should be called with interrupts disabled to avoid race | |
243 | * conditions. | |
c28bda25 | 244 | */ |
1da177e4 | 245 | |
710ddd0d | 246 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 247 | { |
9cb78c16 | 248 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
249 | struct Scsi_Host *instance = cmd->device->host; |
250 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 251 | |
9cb78c16 | 252 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
253 | return 1; |
254 | if (!should_be_tagged || | |
ca513fc9 FT |
255 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
256 | !cmd->device->tagged_supported) | |
c28bda25 | 257 | return 0; |
61d739a4 FT |
258 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
259 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
260 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
261 | scmd_id(cmd), lun); | |
c28bda25 RZ |
262 | return 1; |
263 | } | |
264 | return 0; | |
1da177e4 LT |
265 | } |
266 | ||
267 | ||
268 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
269 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
270 | * untagged. | |
271 | */ | |
272 | ||
710ddd0d | 273 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 274 | { |
9cb78c16 | 275 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
276 | struct Scsi_Host *instance = cmd->device->host; |
277 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
278 | |
279 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
280 | * an untagged command. | |
281 | */ | |
282 | if (!should_be_tagged || | |
ca513fc9 FT |
283 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
284 | !cmd->device->tagged_supported) { | |
c28bda25 | 285 | cmd->tag = TAG_NONE; |
9cb78c16 | 286 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
287 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
288 | scmd_id(cmd), lun); | |
c28bda25 | 289 | } else { |
61d739a4 | 290 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
291 | |
292 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
293 | set_bit(cmd->tag, ta->allocated); | |
294 | ta->nr_allocated++; | |
dbb6b350 FT |
295 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
296 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 297 | } |
1da177e4 LT |
298 | } |
299 | ||
300 | ||
301 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
302 | * unlock the LUN. | |
303 | */ | |
304 | ||
710ddd0d | 305 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 306 | { |
9cb78c16 | 307 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
308 | struct Scsi_Host *instance = cmd->device->host; |
309 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
310 | |
311 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 312 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
313 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
314 | scmd_id(cmd), lun); | |
c28bda25 | 315 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
316 | shost_printk(KERN_NOTICE, instance, |
317 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 318 | } else { |
61d739a4 | 319 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
320 | clear_bit(cmd->tag, ta->allocated); |
321 | ta->nr_allocated--; | |
dbb6b350 FT |
322 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
323 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 324 | } |
1da177e4 LT |
325 | } |
326 | ||
327 | ||
ca513fc9 | 328 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 329 | { |
c28bda25 | 330 | int target, lun; |
61d739a4 | 331 | struct tag_alloc *ta; |
c28bda25 | 332 | |
ca513fc9 | 333 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
334 | return; |
335 | ||
336 | for (target = 0; target < 8; ++target) { | |
337 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 338 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
339 | bitmap_zero(ta->allocated, MAX_TAGS); |
340 | ta->nr_allocated = 0; | |
341 | } | |
1da177e4 | 342 | } |
1da177e4 LT |
343 | } |
344 | ||
345 | #endif /* SUPPORT_TAGS */ | |
346 | ||
347 | ||
348 | /* | |
710ddd0d | 349 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
350 | * |
351 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
352 | * transfer. This is possible if the scatter buffers lie on | |
353 | * physical contiguous addresses. | |
354 | * | |
710ddd0d | 355 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 356 | * The command to work on. The first scatter buffer's data are |
25985edc | 357 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
358 | */ |
359 | ||
710ddd0d | 360 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 361 | { |
e3f463b0 | 362 | #if !defined(CONFIG_SUN3) |
c28bda25 | 363 | unsigned long endaddr; |
1da177e4 | 364 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
365 | unsigned long oldlen = cmd->SCp.this_residual; |
366 | int cnt = 1; | |
1da177e4 LT |
367 | #endif |
368 | ||
c28bda25 RZ |
369 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
370 | cmd->SCp.buffers_residual && | |
5a1cb47f | 371 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 372 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 373 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 374 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 375 | ++cnt; |
1da177e4 | 376 | #endif |
c28bda25 RZ |
377 | ++cmd->SCp.buffer; |
378 | --cmd->SCp.buffers_residual; | |
379 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
380 | endaddr += cmd->SCp.buffer->length; | |
381 | } | |
1da177e4 | 382 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 383 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 384 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 385 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 386 | #endif |
e3f463b0 | 387 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
388 | } |
389 | ||
ff50f9ed FT |
390 | /** |
391 | * initialize_SCp - init the scsi pointer field | |
392 | * @cmd: command block to set up | |
1da177e4 | 393 | * |
ff50f9ed | 394 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
395 | */ |
396 | ||
710ddd0d | 397 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 398 | { |
c28bda25 RZ |
399 | /* |
400 | * Initialize the Scsi Pointer field so that all of the commands in the | |
401 | * various queues are valid. | |
1da177e4 | 402 | */ |
c28bda25 | 403 | |
9e0fe44d BH |
404 | if (scsi_bufflen(cmd)) { |
405 | cmd->SCp.buffer = scsi_sglist(cmd); | |
406 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 407 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
408 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
409 | /* ++roman: Try to merge some scatter-buffers if they are at | |
410 | * contiguous physical addresses. | |
411 | */ | |
412 | merge_contiguous_buffers(cmd); | |
413 | } else { | |
414 | cmd->SCp.buffer = NULL; | |
415 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
416 | cmd->SCp.ptr = NULL; |
417 | cmd->SCp.this_residual = 0; | |
c28bda25 | 418 | } |
f27db8eb FT |
419 | |
420 | cmd->SCp.Status = 0; | |
421 | cmd->SCp.Message = 0; | |
1da177e4 LT |
422 | } |
423 | ||
636b1ec8 | 424 | /** |
b32ade12 | 425 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 426 | * @instance: controller to poll |
b32ade12 FT |
427 | * @reg1: 5380 register to poll |
428 | * @bit1: Bitmask to check | |
429 | * @val1: Expected value | |
430 | * @reg2: Second 5380 register to poll | |
431 | * @bit2: Second bitmask to check | |
432 | * @val2: Second expected value | |
2f854b82 | 433 | * @wait: Time-out in jiffies |
636b1ec8 | 434 | * |
2f854b82 FT |
435 | * Polls the chip in a reasonably efficient manner waiting for an |
436 | * event to occur. After a short quick poll we begin to yield the CPU | |
437 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
438 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 439 | * |
b32ade12 | 440 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
441 | */ |
442 | ||
b32ade12 FT |
443 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
444 | int reg1, int bit1, int val1, | |
445 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 446 | { |
2f854b82 FT |
447 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
448 | unsigned long deadline = jiffies + wait; | |
449 | unsigned long n; | |
450 | ||
451 | /* Busy-wait for up to 10 ms */ | |
452 | n = min(10000U, jiffies_to_usecs(wait)); | |
453 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 454 | n /= 2000; |
2f854b82 | 455 | do { |
b32ade12 FT |
456 | if ((NCR5380_read(reg1) & bit1) == val1) |
457 | return 0; | |
458 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
459 | return 0; |
460 | cpu_relax(); | |
2f854b82 FT |
461 | } while (n--); |
462 | ||
463 | if (irqs_disabled() || in_interrupt()) | |
464 | return -ETIMEDOUT; | |
636b1ec8 | 465 | |
2f854b82 FT |
466 | /* Repeatedly sleep for 1 ms until deadline */ |
467 | while (time_is_after_jiffies(deadline)) { | |
468 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
469 | if ((NCR5380_read(reg1) & bit1) == val1) |
470 | return 0; | |
471 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 472 | return 0; |
636b1ec8 | 473 | } |
2f854b82 | 474 | |
636b1ec8 FT |
475 | return -ETIMEDOUT; |
476 | } | |
477 | ||
b32ade12 FT |
478 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
479 | int reg, int bit, int val, int wait) | |
480 | { | |
481 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
482 | reg, bit, val, wait); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | #if NDEBUG |
486 | static struct { | |
c28bda25 RZ |
487 | unsigned char mask; |
488 | const char *name; | |
489 | } signals[] = { | |
490 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
491 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
492 | { SR_SEL, "SEL" }, {0, NULL} | |
493 | }, basrs[] = { | |
494 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
495 | }, icrs[] = { | |
496 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
497 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
498 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
499 | {0, NULL} | |
500 | }, mrs[] = { | |
501 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
502 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
503 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
504 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
505 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
506 | {0, NULL} | |
507 | }; | |
1da177e4 | 508 | |
ff50f9ed FT |
509 | /** |
510 | * NCR5380_print - print scsi bus signals | |
511 | * @instance: adapter state to dump | |
1da177e4 | 512 | * |
ff50f9ed | 513 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
514 | */ |
515 | ||
c28bda25 RZ |
516 | static void NCR5380_print(struct Scsi_Host *instance) |
517 | { | |
518 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 519 | |
c28bda25 RZ |
520 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
521 | status = NCR5380_read(STATUS_REG); | |
522 | mr = NCR5380_read(MODE_REG); | |
523 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
524 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 525 | |
c28bda25 RZ |
526 | printk("STATUS_REG: %02x ", status); |
527 | for (i = 0; signals[i].mask; ++i) | |
528 | if (status & signals[i].mask) | |
529 | printk(",%s", signals[i].name); | |
530 | printk("\nBASR: %02x ", basr); | |
531 | for (i = 0; basrs[i].mask; ++i) | |
532 | if (basr & basrs[i].mask) | |
533 | printk(",%s", basrs[i].name); | |
534 | printk("\nICR: %02x ", icr); | |
535 | for (i = 0; icrs[i].mask; ++i) | |
536 | if (icr & icrs[i].mask) | |
537 | printk(",%s", icrs[i].name); | |
538 | printk("\nMODE: %02x ", mr); | |
539 | for (i = 0; mrs[i].mask; ++i) | |
540 | if (mr & mrs[i].mask) | |
541 | printk(",%s", mrs[i].name); | |
542 | printk("\n"); | |
1da177e4 LT |
543 | } |
544 | ||
545 | static struct { | |
c28bda25 RZ |
546 | unsigned char value; |
547 | const char *name; | |
1da177e4 | 548 | } phases[] = { |
c28bda25 RZ |
549 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
550 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
551 | {PHASE_UNKNOWN, "UNKNOWN"} | |
552 | }; | |
1da177e4 | 553 | |
ff50f9ed FT |
554 | /** |
555 | * NCR5380_print_phase - show SCSI phase | |
556 | * @instance: adapter to dump | |
1da177e4 | 557 | * |
ff50f9ed | 558 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 559 | * |
ff50f9ed | 560 | * Locks: none |
1da177e4 LT |
561 | */ |
562 | ||
563 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
564 | { | |
c28bda25 RZ |
565 | unsigned char status; |
566 | int i; | |
567 | ||
568 | status = NCR5380_read(STATUS_REG); | |
569 | if (!(status & SR_REQ)) | |
6a6ff4ac | 570 | shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); |
c28bda25 RZ |
571 | else { |
572 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
573 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
574 | ; | |
6a6ff4ac | 575 | shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); |
c28bda25 | 576 | } |
1da177e4 LT |
577 | } |
578 | ||
1da177e4 LT |
579 | #endif |
580 | ||
8c32513b FT |
581 | /** |
582 | * NCR58380_info - report driver and host information | |
583 | * @instance: relevant scsi host instance | |
1da177e4 | 584 | * |
8c32513b | 585 | * For use as the host template info() handler. |
1da177e4 | 586 | * |
8c32513b | 587 | * Locks: none |
1da177e4 LT |
588 | */ |
589 | ||
8c32513b | 590 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 591 | { |
8c32513b FT |
592 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
593 | ||
594 | return hostdata->info; | |
595 | } | |
596 | ||
597 | static void prepare_info(struct Scsi_Host *instance) | |
598 | { | |
599 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
600 | ||
601 | snprintf(hostdata->info, sizeof(hostdata->info), | |
602 | "%s, io_port 0x%lx, n_io_port %d, " | |
603 | "base 0x%lx, irq %d, " | |
604 | "can_queue %d, cmd_per_lun %d, " | |
605 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 606 | "flags { %s%s}, " |
8c32513b FT |
607 | "options { %s} ", |
608 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
609 | instance->base, instance->irq, | |
610 | instance->can_queue, instance->cmd_per_lun, | |
611 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 612 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 613 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
614 | #ifdef DIFFERENTIAL |
615 | "DIFFERENTIAL " | |
616 | #endif | |
1da177e4 | 617 | #ifdef REAL_DMA |
8c32513b | 618 | "REAL_DMA " |
1da177e4 LT |
619 | #endif |
620 | #ifdef PARITY | |
8c32513b | 621 | "PARITY " |
1da177e4 LT |
622 | #endif |
623 | #ifdef SUPPORT_TAGS | |
8c32513b | 624 | "SUPPORT_TAGS " |
1da177e4 | 625 | #endif |
8c32513b | 626 | ""); |
1da177e4 LT |
627 | } |
628 | ||
ff50f9ed FT |
629 | /** |
630 | * NCR5380_init - initialise an NCR5380 | |
631 | * @instance: adapter to configure | |
632 | * @flags: control flags | |
1da177e4 | 633 | * |
ff50f9ed FT |
634 | * Initializes *instance and corresponding 5380 chip, |
635 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
636 | * |
637 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 638 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 639 | * |
ff50f9ed | 640 | * Returns 0 for success |
1da177e4 LT |
641 | */ |
642 | ||
95fde7a8 | 643 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 644 | { |
e8a60144 | 645 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 646 | int i; |
2f854b82 | 647 | unsigned long deadline; |
c28bda25 | 648 | |
a53a21e4 | 649 | hostdata->host = instance; |
c28bda25 RZ |
650 | hostdata->id_mask = 1 << instance->this_id; |
651 | hostdata->id_higher_mask = 0; | |
652 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
653 | if (i > hostdata->id_mask) | |
654 | hostdata->id_higher_mask |= i; | |
655 | for (i = 0; i < 8; ++i) | |
656 | hostdata->busy[i] = 0; | |
1da177e4 | 657 | #ifdef SUPPORT_TAGS |
ca513fc9 | 658 | init_tags(hostdata); |
1da177e4 LT |
659 | #endif |
660 | #if defined (REAL_DMA) | |
c28bda25 | 661 | hostdata->dma_len = 0; |
1da177e4 | 662 | #endif |
11d2f63b | 663 | spin_lock_init(&hostdata->lock); |
c28bda25 | 664 | hostdata->connected = NULL; |
f27db8eb FT |
665 | hostdata->sensing = NULL; |
666 | INIT_LIST_HEAD(&hostdata->autosense); | |
32b26a10 FT |
667 | INIT_LIST_HEAD(&hostdata->unissued); |
668 | INIT_LIST_HEAD(&hostdata->disconnected); | |
669 | ||
ef1081cb | 670 | hostdata->flags = flags; |
c28bda25 | 671 | |
a53a21e4 | 672 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
673 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
674 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
675 | 1, instance->host_no); | |
676 | if (!hostdata->work_q) | |
677 | return -ENOMEM; | |
1da177e4 | 678 | |
8c32513b FT |
679 | prepare_info(instance); |
680 | ||
c28bda25 RZ |
681 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
682 | NCR5380_write(MODE_REG, MR_BASE); | |
683 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
684 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 685 | |
2f854b82 FT |
686 | /* Calibrate register polling loop */ |
687 | i = 0; | |
688 | deadline = jiffies + 1; | |
689 | do { | |
690 | cpu_relax(); | |
691 | } while (time_is_after_jiffies(deadline)); | |
692 | deadline += msecs_to_jiffies(256); | |
693 | do { | |
694 | NCR5380_read(STATUS_REG); | |
695 | ++i; | |
696 | cpu_relax(); | |
697 | } while (time_is_after_jiffies(deadline)); | |
698 | hostdata->accesses_per_ms = i / 256; | |
699 | ||
c28bda25 | 700 | return 0; |
1da177e4 LT |
701 | } |
702 | ||
636b1ec8 FT |
703 | /** |
704 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
705 | * @instance: adapter to check | |
706 | * | |
707 | * If the system crashed, it may have crashed with a connected target and | |
708 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
709 | * currently established nexus, which we know nothing about. Failing that | |
710 | * do a bus reset. | |
711 | * | |
712 | * Note that a bus reset will cause the chip to assert IRQ. | |
713 | * | |
714 | * Returns 0 if successful, otherwise -ENXIO. | |
715 | */ | |
716 | ||
717 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
718 | { | |
9c3f0e2b | 719 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
720 | int pass; |
721 | ||
722 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
723 | switch (pass) { | |
724 | case 1: | |
725 | case 3: | |
726 | case 5: | |
727 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
728 | NCR5380_poll_politely(instance, | |
729 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
730 | break; | |
731 | case 2: | |
732 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
733 | do_abort(instance); | |
734 | break; | |
735 | case 4: | |
736 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
737 | do_reset(instance); | |
9c3f0e2b FT |
738 | /* Wait after a reset; the SCSI standard calls for |
739 | * 250ms, we wait 500ms to be on the safe side. | |
740 | * But some Toshiba CD-ROMs need ten times that. | |
741 | */ | |
742 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
743 | msleep(2500); | |
744 | else | |
745 | msleep(500); | |
636b1ec8 FT |
746 | break; |
747 | case 6: | |
748 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
749 | return -ENXIO; | |
750 | } | |
751 | } | |
752 | return 0; | |
753 | } | |
754 | ||
ff50f9ed FT |
755 | /** |
756 | * NCR5380_exit - remove an NCR5380 | |
757 | * @instance: adapter to remove | |
758 | * | |
759 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
760 | */ | |
761 | ||
6323e4fe GU |
762 | static void NCR5380_exit(struct Scsi_Host *instance) |
763 | { | |
a53a21e4 FT |
764 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
765 | ||
766 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 767 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
768 | } |
769 | ||
677e0194 FT |
770 | /** |
771 | * complete_cmd - finish processing a command and return it to the SCSI ML | |
772 | * @instance: the host instance | |
773 | * @cmd: command to complete | |
774 | */ | |
775 | ||
776 | static void complete_cmd(struct Scsi_Host *instance, | |
777 | struct scsi_cmnd *cmd) | |
778 | { | |
779 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
780 | ||
781 | dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); | |
782 | ||
f27db8eb FT |
783 | if (hostdata->sensing == cmd) { |
784 | /* Autosense processing ends here */ | |
785 | if ((cmd->result & 0xff) != SAM_STAT_GOOD) { | |
786 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
787 | set_host_byte(cmd, DID_ERROR); | |
788 | } else | |
789 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
790 | hostdata->sensing = NULL; | |
791 | } | |
792 | ||
677e0194 FT |
793 | #ifdef SUPPORT_TAGS |
794 | cmd_free_tag(cmd); | |
795 | #else | |
796 | hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); | |
797 | #endif | |
798 | cmd->scsi_done(cmd); | |
799 | } | |
800 | ||
ff50f9ed FT |
801 | /** |
802 | * NCR5380_queue_command - queue a command | |
803 | * @instance: the relevant SCSI adapter | |
804 | * @cmd: SCSI command | |
1da177e4 | 805 | * |
1bb40589 | 806 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
807 | * twiddling done to the host specific fields of cmd. If the |
808 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
809 | */ |
810 | ||
16b29e75 FT |
811 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
812 | struct scsi_cmnd *cmd) | |
1da177e4 | 813 | { |
16b29e75 | 814 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
32b26a10 | 815 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
c28bda25 | 816 | unsigned long flags; |
1da177e4 LT |
817 | |
818 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
819 | switch (cmd->cmnd[0]) { |
820 | case WRITE_6: | |
821 | case WRITE_10: | |
dbb6b350 | 822 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 823 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 824 | cmd->scsi_done(cmd); |
c28bda25 RZ |
825 | return 0; |
826 | } | |
1da177e4 LT |
827 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
828 | ||
c28bda25 RZ |
829 | cmd->result = 0; |
830 | ||
831 | /* | |
832 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
833 | * commands are added to the head of the queue since any command will | |
834 | * clear the contingent allegiance condition that exists and the | |
835 | * sense data is only guaranteed to be valid while the condition exists. | |
836 | */ | |
837 | ||
c28bda25 RZ |
838 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
839 | * Otherwise a running NCR5380_main may steal the lock. | |
840 | * Lock before actually inserting due to fairness reasons explained in | |
841 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
842 | * to release the lock. | |
843 | * Stop timer for this command while waiting for the lock, or timeouts | |
844 | * may happen (and they really do), and it's no good if the command doesn't | |
845 | * appear in any of the queues. | |
846 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
847 | * because also a timer int can trigger an abort or reset, which would | |
848 | * alter queues and touch the lock. | |
849 | */ | |
e3c3da67 | 850 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
851 | return SCSI_MLQUEUE_HOST_BUSY; |
852 | ||
11d2f63b | 853 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 854 | |
ff50f9ed FT |
855 | /* |
856 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
857 | * commands are added to the head of the queue since any command will | |
858 | * clear the contingent allegiance condition that exists and the | |
859 | * sense data is only guaranteed to be valid while the condition exists. | |
860 | */ | |
861 | ||
32b26a10 FT |
862 | if (cmd->cmnd[0] == REQUEST_SENSE) |
863 | list_add(&ncmd->list, &hostdata->unissued); | |
864 | else | |
865 | list_add_tail(&ncmd->list, &hostdata->unissued); | |
866 | ||
11d2f63b | 867 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 868 | |
dbb6b350 FT |
869 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
870 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 871 | |
010e89d1 FT |
872 | /* Kick off command processing */ |
873 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 874 | return 0; |
1da177e4 LT |
875 | } |
876 | ||
e3c3da67 FT |
877 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
878 | { | |
879 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
880 | ||
881 | /* Caller does the locking needed to set & test these data atomically */ | |
32b26a10 FT |
882 | if (list_empty(&hostdata->disconnected) && |
883 | list_empty(&hostdata->unissued) && | |
f27db8eb | 884 | list_empty(&hostdata->autosense) && |
e3c3da67 | 885 | !hostdata->connected && |
707d62b3 | 886 | !hostdata->selecting) |
e3c3da67 FT |
887 | NCR5380_release_dma_irq(instance); |
888 | } | |
889 | ||
f27db8eb FT |
890 | /** |
891 | * dequeue_next_cmd - dequeue a command for processing | |
892 | * @instance: the scsi host instance | |
893 | * | |
894 | * Priority is given to commands on the autosense queue. These commands | |
895 | * need autosense because of a CHECK CONDITION result. | |
896 | * | |
897 | * Returns a command pointer if a command is found for a target that is | |
898 | * not already busy. Otherwise returns NULL. | |
899 | */ | |
900 | ||
901 | static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) | |
902 | { | |
903 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
904 | struct NCR5380_cmd *ncmd; | |
905 | struct scsi_cmnd *cmd; | |
906 | ||
907 | if (list_empty(&hostdata->autosense)) { | |
908 | list_for_each_entry(ncmd, &hostdata->unissued, list) { | |
909 | cmd = NCR5380_to_scmd(ncmd); | |
910 | dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", | |
911 | cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); | |
912 | ||
913 | if ( | |
914 | #ifdef SUPPORT_TAGS | |
915 | !is_lun_busy(cmd, 1) | |
916 | #else | |
917 | !(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun)) | |
918 | #endif | |
919 | ) { | |
920 | list_del(&ncmd->list); | |
921 | dsprintk(NDEBUG_QUEUES, instance, | |
922 | "dequeue: removed %p from issue queue\n", cmd); | |
923 | return cmd; | |
924 | } | |
925 | } | |
926 | } else { | |
927 | /* Autosense processing begins here */ | |
928 | ncmd = list_first_entry(&hostdata->autosense, | |
929 | struct NCR5380_cmd, list); | |
930 | list_del(&ncmd->list); | |
931 | cmd = NCR5380_to_scmd(ncmd); | |
932 | dsprintk(NDEBUG_QUEUES, instance, | |
933 | "dequeue: removed %p from autosense queue\n", cmd); | |
934 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); | |
935 | hostdata->sensing = cmd; | |
936 | return cmd; | |
937 | } | |
938 | return NULL; | |
939 | } | |
940 | ||
941 | static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) | |
942 | { | |
943 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
944 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); | |
945 | ||
946 | if (hostdata->sensing) { | |
947 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
948 | list_add(&ncmd->list, &hostdata->autosense); | |
949 | hostdata->sensing = NULL; | |
950 | } else | |
951 | list_add(&ncmd->list, &hostdata->unissued); | |
952 | } | |
953 | ||
ff50f9ed FT |
954 | /** |
955 | * NCR5380_main - NCR state machines | |
1da177e4 | 956 | * |
ff50f9ed FT |
957 | * NCR5380_main is a coroutine that runs as long as more work can |
958 | * be done on the NCR5380 host adapters in a system. Both | |
959 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
960 | * in case it is not running. | |
c28bda25 | 961 | * |
ff50f9ed | 962 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
963 | */ |
964 | ||
b312b38c | 965 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 966 | { |
a53a21e4 FT |
967 | struct NCR5380_hostdata *hostdata = |
968 | container_of(work, struct NCR5380_hostdata, main_task); | |
969 | struct Scsi_Host *instance = hostdata->host; | |
f27db8eb | 970 | struct scsi_cmnd *cmd; |
c28bda25 | 971 | int done; |
c28bda25 RZ |
972 | |
973 | /* | |
c28bda25 RZ |
974 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
975 | * because also a timer int can trigger an abort or reset, which can | |
976 | * alter queues and touch the Falcon lock. | |
977 | */ | |
978 | ||
11d2f63b | 979 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 980 | do { |
c28bda25 RZ |
981 | done = 1; |
982 | ||
f27db8eb FT |
983 | while (!hostdata->connected && |
984 | (cmd = dequeue_next_cmd(instance))) { | |
0d3d9a42 | 985 | |
f27db8eb | 986 | dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); |
c28bda25 | 987 | |
f27db8eb FT |
988 | /* |
989 | * Attempt to establish an I_T_L nexus here. | |
990 | * On success, instance->hostdata->connected is set. | |
991 | * On failure, we must add the command back to the | |
992 | * issue queue so we can keep trying. | |
993 | */ | |
994 | /* | |
995 | * REQUEST SENSE commands are issued without tagged | |
996 | * queueing, even on SCSI-II devices because the | |
997 | * contingent allegiance condition exists for the | |
998 | * entire unit. | |
999 | */ | |
1000 | /* ++roman: ...and the standard also requires that | |
1001 | * REQUEST SENSE command are untagged. | |
1002 | */ | |
c28bda25 | 1003 | |
1da177e4 | 1004 | #ifdef SUPPORT_TAGS |
f27db8eb | 1005 | cmd_get_tag(cmd, cmd->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1006 | #endif |
707d62b3 FT |
1007 | cmd = NCR5380_select(instance, cmd); |
1008 | if (!cmd) { | |
1009 | dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); | |
f27db8eb FT |
1010 | maybe_release_dma_irq(instance); |
1011 | } else { | |
f27db8eb FT |
1012 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, |
1013 | "main: select failed, returning %p to queue\n", cmd); | |
1014 | requeue_cmd(instance, cmd); | |
1da177e4 | 1015 | #ifdef SUPPORT_TAGS |
f27db8eb | 1016 | cmd_free_tag(cmd); |
1da177e4 | 1017 | #endif |
f27db8eb FT |
1018 | } |
1019 | } | |
c28bda25 | 1020 | if (hostdata->connected |
1da177e4 | 1021 | #ifdef REAL_DMA |
c28bda25 | 1022 | && !hostdata->dma_len |
1da177e4 | 1023 | #endif |
c28bda25 | 1024 | ) { |
b746545f | 1025 | dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n"); |
c28bda25 | 1026 | NCR5380_information_transfer(instance); |
c28bda25 RZ |
1027 | done = 0; |
1028 | } | |
1029 | } while (!done); | |
11d2f63b | 1030 | spin_unlock_irq(&hostdata->lock); |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | ||
1034 | #ifdef REAL_DMA | |
1035 | /* | |
1036 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1037 | * | |
1038 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1039 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1040 | * |
1041 | * Inputs : instance - this instance of the NCR5380. | |
1042 | * | |
1043 | */ | |
1044 | ||
c28bda25 | 1045 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1046 | { |
e8a60144 | 1047 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
01bd9081 | 1048 | int transferred; |
e3f463b0 | 1049 | unsigned char **data; |
5299b3ca | 1050 | int *count; |
e3f463b0 FT |
1051 | int saved_data = 0, overrun = 0; |
1052 | unsigned char p; | |
c28bda25 | 1053 | |
ef1081cb | 1054 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1055 | p = hostdata->connected->SCp.phase; |
1056 | if (p & SR_IO) { | |
1057 | udelay(10); | |
1058 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1059 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1060 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1061 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1062 | overrun = 1; | |
b746545f | 1063 | dsprintk(NDEBUG_DMA, instance, "read overrun handled\n"); |
c28bda25 RZ |
1064 | } |
1065 | } | |
1066 | } | |
1067 | ||
e3f463b0 FT |
1068 | #if defined(CONFIG_SUN3) |
1069 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1070 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1071 | instance->host_no); | |
1072 | BUG(); | |
1073 | } | |
1074 | ||
1075 | /* make sure we're not stuck in a data phase */ | |
1076 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1077 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1078 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1079 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1080 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1081 | instance->host_no); | |
1082 | BUG(); | |
1083 | } | |
1084 | #endif | |
1085 | ||
c28bda25 RZ |
1086 | NCR5380_write(MODE_REG, MR_BASE); |
1087 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1088 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1089 | |
01bd9081 | 1090 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1091 | hostdata->dma_len = 0; |
1092 | ||
1093 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1094 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1095 | *data += transferred; |
1096 | *count -= transferred; | |
c28bda25 | 1097 | |
ef1081cb | 1098 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1099 | int cnt, toPIO; |
1100 | ||
c28bda25 | 1101 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1102 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1103 | if (overrun) { |
d65e634a | 1104 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1105 | *(*data)++ = saved_data; |
1106 | (*count)--; | |
1107 | cnt--; | |
1108 | toPIO--; | |
1109 | } | |
d65e634a | 1110 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1111 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1112 | *count -= toPIO - cnt; | |
1113 | } | |
1da177e4 | 1114 | } |
1da177e4 LT |
1115 | } |
1116 | #endif /* REAL_DMA */ | |
1117 | ||
1118 | ||
ff50f9ed FT |
1119 | /** |
1120 | * NCR5380_intr - generic NCR5380 irq handler | |
1121 | * @irq: interrupt number | |
1122 | * @dev_id: device info | |
1da177e4 | 1123 | * |
ff50f9ed FT |
1124 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1125 | * from the disconnected queue, and restarting NCR5380_main() | |
1126 | * as required. | |
cd400825 FT |
1127 | * |
1128 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1129 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1130 | * Three of these six conditions are latched in the Bus and Status Register: | |
1131 | * - End of DMA (cleared by ending DMA Mode) | |
1132 | * - Parity error (cleared by reading RPIR) | |
1133 | * - Loss of BSY (cleared by reading RPIR) | |
1134 | * Two conditions have flag bits that are not latched: | |
1135 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1136 | * - Bus reset (non-maskable) | |
1137 | * The remaining condition has no flag bit at all: | |
1138 | * - Selection/reselection | |
1139 | * | |
1140 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1141 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1142 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1143 | * interrupts will not be lost (they can be on the DP5380)." | |
1144 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1145 | * | |
1146 | * Checking for bus reset by reading RST is futile because of interrupt | |
1147 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1148 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1149 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1150 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1151 | */ |
1152 | ||
c28bda25 | 1153 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1154 | { |
a53a21e4 | 1155 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1156 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1157 | int handled = 0; |
c28bda25 | 1158 | unsigned char basr; |
11d2f63b FT |
1159 | unsigned long flags; |
1160 | ||
1161 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1162 | |
c28bda25 | 1163 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1164 | if (basr & BASR_IRQ) { |
cd400825 FT |
1165 | unsigned char mr = NCR5380_read(MODE_REG); |
1166 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1167 | ||
b746545f FT |
1168 | dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", |
1169 | irq, basr, sr, mr); | |
1da177e4 LT |
1170 | |
1171 | #if defined(REAL_DMA) | |
cd400825 FT |
1172 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1173 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1174 | * We ack IRQ after clearing Mode Register. Workarounds | |
1175 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1176 | */ |
1177 | ||
b746545f | 1178 | dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n"); |
c28bda25 | 1179 | |
cd400825 FT |
1180 | if (hostdata->connected) { |
1181 | NCR5380_dma_complete(instance); | |
1182 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1183 | } else { | |
1184 | NCR5380_write(MODE_REG, MR_BASE); | |
1185 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1186 | } | |
1187 | } else | |
1da177e4 | 1188 | #endif /* REAL_DMA */ |
cd400825 FT |
1189 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1190 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1191 | /* Probably reselected */ | |
1192 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1193 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1194 | ||
b746545f | 1195 | dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n"); |
cd400825 FT |
1196 | |
1197 | if (!hostdata->connected) { | |
1198 | NCR5380_reselect(instance); | |
1199 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1200 | } | |
1201 | if (!hostdata->connected) | |
1202 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1203 | } else { | |
1204 | /* Probably Bus Reset */ | |
1205 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1206 | ||
b746545f | 1207 | dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n"); |
e3f463b0 | 1208 | #ifdef SUN3_SCSI_VME |
cd400825 | 1209 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1210 | #endif |
cd400825 | 1211 | } |
c28bda25 | 1212 | handled = 1; |
cd400825 FT |
1213 | } else { |
1214 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1215 | #ifdef SUN3_SCSI_VME |
1216 | dregs->csr |= CSR_DMA_ENABLE; | |
1217 | #endif | |
c28bda25 RZ |
1218 | } |
1219 | ||
11d2f63b FT |
1220 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1221 | ||
c28bda25 | 1222 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1223 | } |
1224 | ||
c28bda25 | 1225 | /* |
710ddd0d FT |
1226 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1227 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1228 | * |
1229 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1230 | * including ARBITRATION, SELECTION, and initial message out for |
1231 | * IDENTIFY and queue messages. | |
1da177e4 | 1232 | * |
c28bda25 | 1233 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1234 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1235 | * |
707d62b3 FT |
1236 | * Returns cmd if selection failed but should be retried, |
1237 | * NULL if selection failed and should not be retried, or | |
1238 | * NULL if selection succeeded (hostdata->connected == cmd). | |
1da177e4 | 1239 | * |
c28bda25 RZ |
1240 | * Side effects : |
1241 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1242 | * with registers as they should have been on entry - ie |
1243 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1244 | * will cease to drive any SCSI bus signals. | |
1245 | * | |
c28bda25 RZ |
1246 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1247 | * instance->connected will be set to cmd. | |
1248 | * SELECT interrupt will be disabled. | |
1da177e4 | 1249 | * |
c28bda25 | 1250 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1251 | * cmd->result host byte set to DID_BAD_TARGET. |
1252 | */ | |
1253 | ||
707d62b3 FT |
1254 | static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, |
1255 | struct scsi_cmnd *cmd) | |
1da177e4 | 1256 | { |
e8a60144 | 1257 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1258 | unsigned char tmp[3], phase; |
1259 | unsigned char *data; | |
1260 | int len; | |
ae753a33 | 1261 | int err; |
c28bda25 | 1262 | |
8ad3a593 | 1263 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
b746545f FT |
1264 | dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", |
1265 | instance->this_id); | |
c28bda25 | 1266 | |
707d62b3 FT |
1267 | /* |
1268 | * Arbitration and selection phases are slow and involve dropping the | |
1269 | * lock, so we have to watch out for EH. An exception handler may | |
1270 | * change 'selecting' to NULL. This function will then return NULL | |
1271 | * so that the caller will forget about 'cmd'. (During information | |
1272 | * transfer phases, EH may change 'connected' to NULL.) | |
1273 | */ | |
1274 | hostdata->selecting = cmd; | |
1275 | ||
c28bda25 RZ |
1276 | /* |
1277 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1278 | * data bus during SELECTION. | |
1279 | */ | |
1280 | ||
c28bda25 | 1281 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1282 | |
c28bda25 RZ |
1283 | /* |
1284 | * Start arbitration. | |
1285 | */ | |
1da177e4 | 1286 | |
c28bda25 RZ |
1287 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1288 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1289 | |
55500d9b FT |
1290 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1291 | * Bus Free Delay, arbitration will begin. | |
1292 | */ | |
c28bda25 | 1293 | |
11d2f63b | 1294 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1295 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1296 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1297 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1298 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1299 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1300 | /* Reselection interrupt */ | |
707d62b3 | 1301 | goto out; |
b32ade12 FT |
1302 | } |
1303 | if (err < 0) { | |
1304 | NCR5380_write(MODE_REG, MR_BASE); | |
1305 | shost_printk(KERN_ERR, instance, | |
1306 | "select: arbitration timeout\n"); | |
707d62b3 | 1307 | goto out; |
c28bda25 | 1308 | } |
11d2f63b | 1309 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1310 | |
55500d9b | 1311 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1312 | udelay(3); |
1313 | ||
1314 | /* Check for lost arbitration */ | |
1315 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1316 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1317 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1318 | NCR5380_write(MODE_REG, MR_BASE); |
b746545f | 1319 | dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n"); |
11d2f63b | 1320 | spin_lock_irq(&hostdata->lock); |
707d62b3 | 1321 | goto out; |
c28bda25 | 1322 | } |
1da177e4 | 1323 | |
cf13b083 FT |
1324 | /* After/during arbitration, BSY should be asserted. |
1325 | * IBM DPES-31080 Version S31Q works now | |
1326 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1327 | */ | |
c28bda25 RZ |
1328 | NCR5380_write(INITIATOR_COMMAND_REG, |
1329 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1330 | ||
c28bda25 RZ |
1331 | /* |
1332 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1333 | * a minimum so we'll udelay ceil(1.2) | |
1334 | */ | |
1da177e4 | 1335 | |
9c3f0e2b FT |
1336 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1337 | udelay(15); | |
1338 | else | |
1339 | udelay(2); | |
c28bda25 | 1340 | |
11d2f63b FT |
1341 | spin_lock_irq(&hostdata->lock); |
1342 | ||
72064a78 FT |
1343 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1344 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
707d62b3 FT |
1345 | goto out; |
1346 | ||
1347 | if (!hostdata->selecting) { | |
1348 | NCR5380_write(MODE_REG, MR_BASE); | |
1349 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1350 | goto out; | |
1351 | } | |
c28bda25 | 1352 | |
b746545f | 1353 | dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); |
c28bda25 RZ |
1354 | |
1355 | /* | |
1356 | * Now that we have won arbitration, start Selection process, asserting | |
1357 | * the host and target ID's on the SCSI bus. | |
1358 | */ | |
1359 | ||
1360 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1361 | ||
1362 | /* | |
1363 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1364 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1365 | * phase immediately after selection. | |
1366 | */ | |
1367 | ||
1368 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1369 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1370 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1371 | |
c28bda25 RZ |
1372 | /* |
1373 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1374 | * otherwise we will trigger an interrupt. | |
1375 | */ | |
c28bda25 | 1376 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1377 | |
11d2f63b FT |
1378 | spin_unlock_irq(&hostdata->lock); |
1379 | ||
c28bda25 RZ |
1380 | /* |
1381 | * The initiator shall then wait at least two deskew delays and release | |
1382 | * the BSY signal. | |
1383 | */ | |
1384 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1385 | ||
1386 | /* Reset BSY */ | |
1387 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1388 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1389 | ||
1390 | /* | |
1391 | * Something weird happens when we cease to drive BSY - looks | |
1392 | * like the board/chip is letting us do another read before the | |
1393 | * appropriate propagation delay has expired, and we're confusing | |
1394 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1395 | * | |
1396 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1397 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1398 | * tighter 'C' code breaks and requires this) solves the problem - | |
1399 | * the 1 us delay is arbitrary, and only used because this delay will | |
1400 | * be the same on other platforms and since it works here, it should | |
1401 | * work there. | |
1402 | * | |
1403 | * wingel suggests that this could be due to failing to wait | |
1404 | * one deskew delay. | |
1405 | */ | |
1da177e4 | 1406 | |
c28bda25 | 1407 | udelay(1); |
1da177e4 | 1408 | |
b746545f | 1409 | dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd)); |
1da177e4 | 1410 | |
c28bda25 RZ |
1411 | /* |
1412 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1413 | * selection. | |
1414 | */ | |
1da177e4 | 1415 | |
ae753a33 FT |
1416 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1417 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1418 | |
1419 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1420 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1421 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1422 | NCR5380_reselect(instance); | |
cd400825 FT |
1423 | if (!hostdata->connected) |
1424 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
6a6ff4ac | 1425 | shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n"); |
707d62b3 | 1426 | goto out; |
c28bda25 | 1427 | } |
1da177e4 | 1428 | |
ae753a33 | 1429 | if (err < 0) { |
11d2f63b | 1430 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1431 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1432 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
707d62b3 FT |
1433 | /* Can't touch cmd if it has been reclaimed by the scsi ML */ |
1434 | if (hostdata->selecting) { | |
1435 | cmd->result = DID_BAD_TARGET << 16; | |
1436 | complete_cmd(instance, cmd); | |
1437 | dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n"); | |
1438 | cmd = NULL; | |
1439 | } | |
1440 | goto out; | |
c28bda25 RZ |
1441 | } |
1442 | ||
ae753a33 FT |
1443 | /* |
1444 | * No less than two deskew delays after the initiator detects the | |
1445 | * BSY signal is true, it shall release the SEL signal and may | |
1446 | * change the DATA BUS. -wingel | |
1447 | */ | |
1448 | ||
1449 | udelay(1); | |
1450 | ||
1451 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1452 | ||
c28bda25 RZ |
1453 | /* |
1454 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1455 | * was true but before BSY was false during selection, the information | |
1456 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1457 | * IDENTIFY message. | |
1458 | * | |
1459 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1460 | * message (2 bytes) with a tag ID that we increment with every command | |
1461 | * until it wraps back to 0. | |
1462 | * | |
1463 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1464 | * which claim to support tagged queuing but fail when more than | |
1465 | * some number of commands are issued at once. | |
1466 | */ | |
1467 | ||
1468 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1469 | |
1470 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1471 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1472 | if (err < 0) { |
1473 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1474 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1475 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
707d62b3 FT |
1476 | goto out; |
1477 | } | |
1478 | if (!hostdata->selecting) { | |
1479 | do_abort(instance); | |
1480 | goto out; | |
55500d9b | 1481 | } |
c28bda25 | 1482 | |
b746545f FT |
1483 | dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", |
1484 | scmd_id(cmd)); | |
c28bda25 | 1485 | tmp[0] = IDENTIFY(1, cmd->device->lun); |
1da177e4 LT |
1486 | |
1487 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1488 | if (cmd->tag != TAG_NONE) { |
1489 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1490 | tmp[2] = cmd->tag; | |
1491 | len = 3; | |
1492 | } else | |
1493 | len = 1; | |
1da177e4 | 1494 | #else |
c28bda25 RZ |
1495 | len = 1; |
1496 | cmd->tag = 0; | |
1da177e4 LT |
1497 | #endif /* SUPPORT_TAGS */ |
1498 | ||
c28bda25 RZ |
1499 | /* Send message(s) */ |
1500 | data = tmp; | |
1501 | phase = PHASE_MSGOUT; | |
1502 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f | 1503 | dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n"); |
c28bda25 | 1504 | /* XXX need to handle errors here */ |
11d2f63b | 1505 | |
c28bda25 | 1506 | hostdata->connected = cmd; |
1da177e4 | 1507 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1508 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1509 | #endif | |
e3f463b0 FT |
1510 | #ifdef SUN3_SCSI_VME |
1511 | dregs->csr |= CSR_INTR; | |
1512 | #endif | |
1da177e4 | 1513 | |
c28bda25 | 1514 | initialize_SCp(cmd); |
1da177e4 | 1515 | |
707d62b3 FT |
1516 | cmd = NULL; |
1517 | ||
1518 | out: | |
1519 | if (!hostdata->selecting) | |
1520 | return NULL; | |
1521 | hostdata->selecting = NULL; | |
1522 | return cmd; | |
1da177e4 LT |
1523 | } |
1524 | ||
c28bda25 RZ |
1525 | /* |
1526 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1527 | * unsigned char *phase, int *count, unsigned char **data) |
1528 | * | |
1529 | * Purpose : transfers data in given phase using polled I/O | |
1530 | * | |
c28bda25 RZ |
1531 | * Inputs : instance - instance of driver, *phase - pointer to |
1532 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1533 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1534 | * |
1da177e4 | 1535 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1536 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1537 | * is in same phase. |
1538 | * | |
c28bda25 | 1539 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1540 | * |
1541 | * XXX Note : handling for bus free may be useful. | |
1542 | */ | |
1543 | ||
1544 | /* | |
c28bda25 | 1545 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1546 | * IS 100% reliable, and for the actual data transfer where speed |
1547 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1548 | */ | |
1549 | ||
c28bda25 RZ |
1550 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1551 | unsigned char *phase, int *count, | |
1552 | unsigned char **data) | |
1da177e4 | 1553 | { |
c28bda25 RZ |
1554 | register unsigned char p = *phase, tmp; |
1555 | register int c = *count; | |
1556 | register unsigned char *d = *data; | |
1557 | ||
1558 | /* | |
1559 | * The NCR5380 chip will only drive the SCSI bus when the | |
1560 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1561 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1562 | */ |
1da177e4 | 1563 | |
c28bda25 | 1564 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1565 | |
c28bda25 RZ |
1566 | do { |
1567 | /* | |
1568 | * Wait for assertion of REQ, after which the phase bits will be | |
1569 | * valid | |
1570 | */ | |
686f3990 FT |
1571 | |
1572 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1573 | break; | |
1da177e4 | 1574 | |
b746545f | 1575 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n"); |
1da177e4 | 1576 | |
c28bda25 | 1577 | /* Check for phase mismatch */ |
686f3990 | 1578 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
b746545f | 1579 | dsprintk(NDEBUG_PIO, instance, "phase mismatch\n"); |
8ad3a593 | 1580 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1581 | break; |
1582 | } | |
1da177e4 | 1583 | |
c28bda25 RZ |
1584 | /* Do actual transfer from SCSI bus to / from memory */ |
1585 | if (!(p & SR_IO)) | |
1586 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1587 | else | |
1588 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1589 | |
c28bda25 | 1590 | ++d; |
1da177e4 | 1591 | |
c28bda25 RZ |
1592 | /* |
1593 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1594 | * should drop ATN on the last byte of the message phase | |
1595 | * after REQ has been asserted for the handshake but before | |
1596 | * the initiator raises ACK. | |
1597 | */ | |
1da177e4 | 1598 | |
c28bda25 RZ |
1599 | if (!(p & SR_IO)) { |
1600 | if (!((p & SR_MSG) && c > 1)) { | |
1601 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1602 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1603 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1604 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1605 | } else { | |
1606 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1607 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1608 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1609 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1610 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1611 | } | |
1612 | } else { | |
8ad3a593 | 1613 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1614 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1615 | } | |
1da177e4 | 1616 | |
a2edc4a6 FT |
1617 | if (NCR5380_poll_politely(instance, |
1618 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1619 | break; | |
c28bda25 | 1620 | |
b746545f | 1621 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n"); |
c28bda25 RZ |
1622 | |
1623 | /* | |
1624 | * We have several special cases to consider during REQ/ACK handshaking : | |
1625 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1626 | * message. ATN must be dropped as ACK is dropped. | |
1627 | * | |
1628 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1629 | * message. We must exit with ACK asserted, so that the calling | |
1630 | * code may raise ATN before dropping ACK to reject the message. | |
1631 | * | |
1632 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1633 | */ | |
1634 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1635 | if (p == PHASE_MSGOUT && c > 1) | |
1636 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1637 | else | |
1638 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1639 | } | |
1640 | } while (--c); | |
1641 | ||
b746545f | 1642 | dsprintk(NDEBUG_PIO, instance, "residual %d\n", c); |
c28bda25 RZ |
1643 | |
1644 | *count = c; | |
1645 | *data = d; | |
1646 | tmp = NCR5380_read(STATUS_REG); | |
1647 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1648 | * asserted or if ACK hasn't been released yet. The latter applies if |
1649 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1650 | */ |
a2edc4a6 | 1651 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1652 | *phase = tmp & PHASE_MASK; |
1653 | else | |
1654 | *phase = PHASE_UNKNOWN; | |
1655 | ||
1656 | if (!c || (*phase == p)) | |
1657 | return 0; | |
1658 | else | |
1659 | return -1; | |
1da177e4 LT |
1660 | } |
1661 | ||
636b1ec8 FT |
1662 | /** |
1663 | * do_reset - issue a reset command | |
1664 | * @instance: adapter to reset | |
1665 | * | |
1666 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1667 | * back into sane shape. | |
1668 | * | |
1669 | * This clears the reset interrupt flag because there may be no handler for | |
1670 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1671 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1672 | */ | |
1673 | ||
1674 | static void do_reset(struct Scsi_Host *instance) | |
1675 | { | |
1676 | unsigned long flags; | |
1677 | ||
1678 | local_irq_save(flags); | |
1679 | NCR5380_write(TARGET_COMMAND_REG, | |
1680 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1681 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1682 | udelay(50); | |
1683 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1684 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1685 | local_irq_restore(flags); | |
1686 | } | |
1687 | ||
80d3eb6d FT |
1688 | /** |
1689 | * do_abort - abort the currently established nexus by going to | |
1690 | * MESSAGE OUT phase and sending an ABORT message. | |
1691 | * @instance: relevant scsi host instance | |
c28bda25 | 1692 | * |
80d3eb6d | 1693 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1694 | */ |
1695 | ||
a53a21e4 | 1696 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1697 | { |
c28bda25 RZ |
1698 | unsigned char tmp, *msgptr, phase; |
1699 | int len; | |
80d3eb6d | 1700 | int rc; |
c28bda25 RZ |
1701 | |
1702 | /* Request message out phase */ | |
1da177e4 | 1703 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1704 | |
1705 | /* | |
1706 | * Wait for the target to indicate a valid phase by asserting | |
1707 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1708 | * and can immediately send the ABORT message, or we'll have some | |
1709 | * other phase and will have to source/sink data. | |
1710 | * | |
1711 | * We really don't care what value was on the bus or what value | |
1712 | * the target sees, so we just handshake. | |
1713 | */ | |
1714 | ||
80d3eb6d FT |
1715 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1716 | if (rc < 0) | |
1717 | goto timeout; | |
1718 | ||
1719 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1720 | |
1721 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1722 | ||
80d3eb6d FT |
1723 | if (tmp != PHASE_MSGOUT) { |
1724 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1725 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1726 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1727 | if (rc < 0) | |
1728 | goto timeout; | |
c28bda25 RZ |
1729 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1730 | } | |
1731 | ||
1732 | tmp = ABORT; | |
1733 | msgptr = &tmp; | |
1734 | len = 1; | |
1735 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1736 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1737 | |
1738 | /* | |
1739 | * If we got here, and the command completed successfully, | |
1740 | * we're about to go into bus free state. | |
1741 | */ | |
1742 | ||
1743 | return len ? -1 : 0; | |
80d3eb6d FT |
1744 | |
1745 | timeout: | |
1746 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1747 | return -1; | |
1da177e4 LT |
1748 | } |
1749 | ||
1750 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1751 | /* |
1752 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1753 | * unsigned char *phase, int *count, unsigned char **data) |
1754 | * | |
1755 | * Purpose : transfers data in given phase using either real | |
1756 | * or pseudo DMA. | |
1757 | * | |
c28bda25 RZ |
1758 | * Inputs : instance - instance of driver, *phase - pointer to |
1759 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1760 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1761 | * |
1da177e4 | 1762 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1763 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1764 | * is in same phase. |
1765 | * | |
c28bda25 | 1766 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1767 | * |
1768 | */ | |
1769 | ||
1770 | ||
c28bda25 RZ |
1771 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1772 | unsigned char *phase, int *count, | |
1773 | unsigned char **data) | |
1da177e4 | 1774 | { |
e8a60144 | 1775 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1776 | register int c = *count; |
1777 | register unsigned char p = *phase; | |
e3f463b0 FT |
1778 | |
1779 | #if defined(CONFIG_SUN3) | |
1780 | /* sanity check */ | |
1781 | if (!sun3_dma_setup_done) { | |
1782 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1783 | instance->host_no); | |
1784 | BUG(); | |
1785 | } | |
1786 | hostdata->dma_len = c; | |
1787 | ||
b746545f FT |
1788 | dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", |
1789 | (p & SR_IO) ? "receive" : "send", c, *data); | |
e3f463b0 FT |
1790 | |
1791 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1792 | |
1793 | /* send start chain */ | |
1794 | sun3scsi_dma_start(c, *data); | |
1795 | ||
cd400825 FT |
1796 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1797 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1798 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1799 | if (p & SR_IO) { |
e3f463b0 | 1800 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1801 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1802 | } else { | |
e3f463b0 | 1803 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1804 | NCR5380_write(START_DMA_SEND_REG, 0); |
1805 | } | |
1806 | ||
1807 | #ifdef SUN3_SCSI_VME | |
1808 | dregs->csr |= CSR_DMA_ENABLE; | |
1809 | #endif | |
1810 | ||
e3f463b0 FT |
1811 | sun3_dma_active = 1; |
1812 | ||
1813 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1814 | register unsigned char *d = *data; |
1815 | unsigned char tmp; | |
c28bda25 RZ |
1816 | |
1817 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1818 | *phase = tmp; | |
1819 | return -1; | |
1820 | } | |
1da177e4 | 1821 | |
ef1081cb FT |
1822 | if (hostdata->read_overruns && (p & SR_IO)) |
1823 | c -= hostdata->read_overruns; | |
1da177e4 | 1824 | |
b746545f FT |
1825 | dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", |
1826 | (p & SR_IO) ? "receive" : "send", c, d); | |
1da177e4 | 1827 | |
c28bda25 | 1828 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1829 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1830 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1831 | |
ef1081cb | 1832 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1833 | /* On the Medusa, it is a must to initialize the DMA before |
1834 | * starting the NCR. This is also the cleaner way for the TT. | |
1835 | */ | |
c28bda25 RZ |
1836 | hostdata->dma_len = (p & SR_IO) ? |
1837 | NCR5380_dma_read_setup(instance, d, c) : | |
1838 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1839 | } |
1840 | ||
1841 | if (p & SR_IO) | |
1842 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1843 | else { | |
1844 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1845 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1846 | } | |
1847 | ||
ef1081cb | 1848 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1849 | /* On the Falcon, the DMA setup must be done after the last */ |
1850 | /* NCR access, else the DMA setup gets trashed! | |
1851 | */ | |
c28bda25 RZ |
1852 | hostdata->dma_len = (p & SR_IO) ? |
1853 | NCR5380_dma_read_setup(instance, d, c) : | |
1854 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1855 | } |
e3f463b0 FT |
1856 | #endif /* !defined(CONFIG_SUN3) */ |
1857 | ||
c28bda25 | 1858 | return 0; |
1da177e4 LT |
1859 | } |
1860 | #endif /* defined(REAL_DMA) */ | |
1861 | ||
1862 | /* | |
1863 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1864 | * | |
c28bda25 RZ |
1865 | * Purpose : run through the various SCSI phases and do as the target |
1866 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1867 | * instance->connected. |
1868 | * | |
1869 | * Inputs : instance, instance for which we are doing commands | |
1870 | * | |
c28bda25 | 1871 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1872 | * modified if a command disconnects, *instance->connected will |
1873 | * change. | |
1874 | * | |
c28bda25 RZ |
1875 | * XXX Note : we need to watch for bus free or a reset condition here |
1876 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1877 | */ |
c28bda25 RZ |
1878 | |
1879 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1880 | { |
e8a60144 | 1881 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1882 | unsigned char msgout = NOP; |
1883 | int sink = 0; | |
1884 | int len; | |
1da177e4 | 1885 | #if defined(REAL_DMA) |
c28bda25 | 1886 | int transfersize; |
1da177e4 | 1887 | #endif |
c28bda25 RZ |
1888 | unsigned char *data; |
1889 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1890 | struct scsi_cmnd *cmd; |
c28bda25 | 1891 | |
e3f463b0 FT |
1892 | #ifdef SUN3_SCSI_VME |
1893 | dregs->csr |= CSR_INTR; | |
1894 | #endif | |
1895 | ||
11d2f63b | 1896 | while ((cmd = hostdata->connected)) { |
32b26a10 FT |
1897 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
1898 | ||
c28bda25 RZ |
1899 | tmp = NCR5380_read(STATUS_REG); |
1900 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1901 | if (tmp & SR_REQ) { | |
1902 | phase = (tmp & PHASE_MASK); | |
1903 | if (phase != old_phase) { | |
1904 | old_phase = phase; | |
8ad3a593 | 1905 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1906 | } |
e3f463b0 FT |
1907 | #if defined(CONFIG_SUN3) |
1908 | if (phase == PHASE_CMDOUT) { | |
1909 | #if defined(REAL_DMA) | |
1910 | void *d; | |
1911 | unsigned long count; | |
1912 | ||
1913 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1914 | count = cmd->SCp.buffer->length; | |
1915 | d = sg_virt(cmd->SCp.buffer); | |
1916 | } else { | |
1917 | count = cmd->SCp.this_residual; | |
1918 | d = cmd->SCp.ptr; | |
1919 | } | |
1920 | /* this command setup for dma yet? */ | |
1921 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1922 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
cd46140a | 1923 | sun3scsi_dma_setup(instance, d, count, |
e3f463b0 FT |
1924 | rq_data_dir(cmd->request)); |
1925 | sun3_dma_setup_done = cmd; | |
1926 | } | |
1927 | } | |
1928 | #endif | |
1929 | #ifdef SUN3_SCSI_VME | |
1930 | dregs->csr |= CSR_INTR; | |
1931 | #endif | |
1932 | } | |
1933 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1934 | |
c28bda25 RZ |
1935 | if (sink && (phase != PHASE_MSGOUT)) { |
1936 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1937 | ||
1938 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1939 | ICR_ASSERT_ACK); | |
1940 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1941 | ; | |
1942 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1943 | ICR_ASSERT_ATN); | |
1944 | sink = 0; | |
1945 | continue; | |
1946 | } | |
1947 | ||
1948 | switch (phase) { | |
1949 | case PHASE_DATAOUT: | |
1da177e4 | 1950 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
6a6ff4ac | 1951 | shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n"); |
c28bda25 RZ |
1952 | sink = 1; |
1953 | do_abort(instance); | |
1954 | cmd->result = DID_ERROR << 16; | |
677e0194 | 1955 | complete_cmd(instance, cmd); |
c28bda25 | 1956 | return; |
1da177e4 | 1957 | #endif |
c28bda25 RZ |
1958 | case PHASE_DATAIN: |
1959 | /* | |
1960 | * If there is no room left in the current buffer in the | |
1961 | * scatter-gather list, move onto the next one. | |
1962 | */ | |
1963 | ||
1964 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1965 | ++cmd->SCp.buffer; | |
1966 | --cmd->SCp.buffers_residual; | |
1967 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1968 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1969 | /* ++roman: Try to merge some scatter-buffers if |
1970 | * they are at contiguous physical addresses. | |
1971 | */ | |
1972 | merge_contiguous_buffers(cmd); | |
b746545f FT |
1973 | dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", |
1974 | cmd->SCp.this_residual, | |
1975 | cmd->SCp.buffers_residual); | |
c28bda25 RZ |
1976 | } |
1977 | ||
1978 | /* | |
1979 | * The preferred transfer method is going to be | |
1980 | * PSEUDO-DMA for systems that are strictly PIO, | |
1981 | * since we can let the hardware do the handshaking. | |
1982 | * | |
1983 | * For this to work, we need to know the transfersize | |
1984 | * ahead of time, since the pseudo-DMA code will sit | |
1985 | * in an unconditional loop. | |
1986 | */ | |
1987 | ||
1988 | /* ++roman: I suggest, this should be | |
1989 | * #if def(REAL_DMA) | |
1990 | * instead of leaving REAL_DMA out. | |
1991 | */ | |
1da177e4 LT |
1992 | |
1993 | #if defined(REAL_DMA) | |
e3f463b0 | 1994 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1995 | transfersize = 0; |
1996 | if (!cmd->device->borken) | |
e3f463b0 | 1997 | #endif |
ff3d4578 FT |
1998 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1999 | ||
2000 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
2001 | len = transfersize; |
2002 | cmd->SCp.phase = phase; | |
2003 | if (NCR5380_transfer_dma(instance, &phase, | |
2004 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2005 | /* | |
2006 | * If the watchdog timer fires, all future | |
2007 | * accesses to this device will use the | |
2008 | * polled-IO. */ | |
ff50f9ed FT |
2009 | scmd_printk(KERN_INFO, cmd, |
2010 | "switching to slow handshake\n"); | |
c28bda25 | 2011 | cmd->device->borken = 1; |
c28bda25 RZ |
2012 | sink = 1; |
2013 | do_abort(instance); | |
2014 | cmd->result = DID_ERROR << 16; | |
677e0194 | 2015 | complete_cmd(instance, cmd); |
c28bda25 RZ |
2016 | /* XXX - need to source or sink data here, as appropriate */ |
2017 | } else { | |
1da177e4 | 2018 | #ifdef REAL_DMA |
c28bda25 RZ |
2019 | /* ++roman: When using real DMA, |
2020 | * information_transfer() should return after | |
2021 | * starting DMA since it has nothing more to | |
2022 | * do. | |
2023 | */ | |
2024 | return; | |
2025 | #else | |
2026 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2027 | #endif |
c28bda25 RZ |
2028 | } |
2029 | } else | |
1da177e4 | 2030 | #endif /* defined(REAL_DMA) */ |
11d2f63b FT |
2031 | { |
2032 | spin_unlock_irq(&hostdata->lock); | |
c28bda25 RZ |
2033 | NCR5380_transfer_pio(instance, &phase, |
2034 | (int *)&cmd->SCp.this_residual, | |
2035 | (unsigned char **)&cmd->SCp.ptr); | |
11d2f63b FT |
2036 | spin_lock_irq(&hostdata->lock); |
2037 | } | |
e3f463b0 FT |
2038 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2039 | /* if we had intended to dma that command clear it */ | |
2040 | if (sun3_dma_setup_done == cmd) | |
2041 | sun3_dma_setup_done = NULL; | |
2042 | #endif | |
c28bda25 RZ |
2043 | break; |
2044 | case PHASE_MSGIN: | |
2045 | len = 1; | |
2046 | data = &tmp; | |
c28bda25 RZ |
2047 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2048 | cmd->SCp.Message = tmp; | |
2049 | ||
2050 | switch (tmp) { | |
c28bda25 RZ |
2051 | case ABORT: |
2052 | case COMMAND_COMPLETE: | |
2053 | /* Accept message by clearing ACK */ | |
2054 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
0d3d9a42 FT |
2055 | dsprintk(NDEBUG_QUEUES, instance, |
2056 | "COMMAND COMPLETE %p target %d lun %llu\n", | |
2057 | cmd, scmd_id(cmd), cmd->device->lun); | |
e3c3da67 | 2058 | |
e3c3da67 | 2059 | hostdata->connected = NULL; |
1da177e4 | 2060 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2061 | cmd_free_tag(cmd); |
2062 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
b746545f FT |
2063 | u8 lun = cmd->device->lun; |
2064 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; | |
2065 | ||
2066 | dsprintk(NDEBUG_TAGS, instance, | |
2067 | "QUEUE_FULL %p target %d lun %d nr_allocated %d\n", | |
2068 | cmd, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 2069 | if (ta->queue_size > ta->nr_allocated) |
e42d0151 | 2070 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2071 | } |
1da177e4 | 2072 | #endif |
c28bda25 | 2073 | |
f27db8eb FT |
2074 | cmd->result &= ~0xffff; |
2075 | cmd->result |= cmd->SCp.Status; | |
2076 | cmd->result |= cmd->SCp.Message << 8; | |
28424d3a | 2077 | |
f27db8eb | 2078 | if (cmd->cmnd[0] == REQUEST_SENSE) |
677e0194 | 2079 | complete_cmd(instance, cmd); |
f27db8eb FT |
2080 | else { |
2081 | if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION || | |
2082 | cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) { | |
2083 | dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n", | |
2084 | cmd); | |
2085 | list_add_tail(&ncmd->list, | |
2086 | &hostdata->autosense); | |
2087 | } else | |
2088 | complete_cmd(instance, cmd); | |
c28bda25 RZ |
2089 | } |
2090 | ||
c28bda25 RZ |
2091 | /* |
2092 | * Restore phase bits to 0 so an interrupted selection, | |
2093 | * arbitration can resume. | |
2094 | */ | |
2095 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2096 | ||
72064a78 FT |
2097 | /* Enable reselect interrupts */ |
2098 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2099 | ||
c28bda25 RZ |
2100 | /* ++roman: For Falcon SCSI, release the lock on the |
2101 | * ST-DMA here if no other commands are waiting on the | |
2102 | * disconnected queue. | |
2103 | */ | |
e3c3da67 | 2104 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2105 | return; |
2106 | case MESSAGE_REJECT: | |
2107 | /* Accept message by clearing ACK */ | |
2108 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2109 | switch (hostdata->last_message) { |
2110 | case HEAD_OF_QUEUE_TAG: | |
2111 | case ORDERED_QUEUE_TAG: | |
2112 | case SIMPLE_QUEUE_TAG: | |
2113 | /* The target obviously doesn't support tagged | |
2114 | * queuing, even though it announced this ability in | |
2115 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2116 | * clear 'tagged_supported' and lock the LUN, since | |
2117 | * the command is treated as untagged further on. | |
2118 | */ | |
2119 | cmd->device->tagged_supported = 0; | |
2120 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2121 | cmd->tag = TAG_NONE; | |
b746545f FT |
2122 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %llu rejected QUEUE_TAG message; tagged queuing disabled\n", |
2123 | scmd_id(cmd), cmd->device->lun); | |
c28bda25 RZ |
2124 | break; |
2125 | } | |
2126 | break; | |
2127 | case DISCONNECT: | |
2128 | /* Accept message by clearing ACK */ | |
2129 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 | 2130 | hostdata->connected = NULL; |
32b26a10 | 2131 | list_add(&ncmd->list, &hostdata->disconnected); |
0d3d9a42 FT |
2132 | dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, |
2133 | instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", | |
2134 | cmd, scmd_id(cmd), cmd->device->lun); | |
2135 | ||
c28bda25 RZ |
2136 | /* |
2137 | * Restore phase bits to 0 so an interrupted selection, | |
2138 | * arbitration can resume. | |
2139 | */ | |
2140 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2141 | ||
2142 | /* Enable reselect interrupts */ | |
2143 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2144 | #ifdef SUN3_SCSI_VME |
2145 | dregs->csr |= CSR_DMA_ENABLE; | |
2146 | #endif | |
c28bda25 RZ |
2147 | return; |
2148 | /* | |
2149 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2150 | * operation, in violation of the SCSI spec so we can safely | |
2151 | * ignore SAVE/RESTORE pointers calls. | |
2152 | * | |
2153 | * Unfortunately, some disks violate the SCSI spec and | |
2154 | * don't issue the required SAVE_POINTERS message before | |
2155 | * disconnecting, and we have to break spec to remain | |
2156 | * compatible. | |
2157 | */ | |
2158 | case SAVE_POINTERS: | |
2159 | case RESTORE_POINTERS: | |
2160 | /* Accept message by clearing ACK */ | |
2161 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2162 | break; |
2163 | case EXTENDED_MESSAGE: | |
2164 | /* | |
2165 | * Extended messages are sent in the following format : | |
2166 | * Byte | |
2167 | * 0 EXTENDED_MESSAGE == 1 | |
2168 | * 1 length (includes one byte for code, doesn't | |
2169 | * include first two bytes) | |
2170 | * 2 code | |
2171 | * 3..length+1 arguments | |
2172 | * | |
2173 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2174 | * byte, since spi_print_msg() wants the whole thing. | |
2175 | */ | |
2176 | extended_msg[0] = EXTENDED_MESSAGE; | |
2177 | /* Accept first byte by clearing ACK */ | |
2178 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2179 | ||
11d2f63b FT |
2180 | spin_unlock_irq(&hostdata->lock); |
2181 | ||
b746545f | 2182 | dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n"); |
c28bda25 RZ |
2183 | |
2184 | len = 2; | |
2185 | data = extended_msg + 1; | |
2186 | phase = PHASE_MSGIN; | |
2187 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
2188 | dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n", |
2189 | (int)extended_msg[1], | |
2190 | (int)extended_msg[2]); | |
c28bda25 | 2191 | |
e0783ed3 FT |
2192 | if (!len && extended_msg[1] > 0 && |
2193 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2194 | /* Accept third byte by clearing ACK */ |
2195 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2196 | len = extended_msg[1] - 1; | |
2197 | data = extended_msg + 3; | |
2198 | phase = PHASE_MSGIN; | |
2199 | ||
2200 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
2201 | dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n", |
2202 | len); | |
c28bda25 RZ |
2203 | |
2204 | switch (extended_msg[2]) { | |
2205 | case EXTENDED_SDTR: | |
2206 | case EXTENDED_WDTR: | |
2207 | case EXTENDED_MODIFY_DATA_POINTER: | |
2208 | case EXTENDED_EXTENDED_IDENTIFY: | |
2209 | tmp = 0; | |
2210 | } | |
2211 | } else if (len) { | |
6a6ff4ac | 2212 | shost_printk(KERN_ERR, instance, "error receiving extended message\n"); |
c28bda25 RZ |
2213 | tmp = 0; |
2214 | } else { | |
6a6ff4ac FT |
2215 | shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n", |
2216 | extended_msg[2], extended_msg[1]); | |
c28bda25 RZ |
2217 | tmp = 0; |
2218 | } | |
11d2f63b FT |
2219 | |
2220 | spin_lock_irq(&hostdata->lock); | |
2221 | if (!hostdata->connected) | |
2222 | return; | |
2223 | ||
c28bda25 RZ |
2224 | /* Fall through to reject message */ |
2225 | ||
2226 | /* | |
2227 | * If we get something weird that we aren't expecting, | |
2228 | * reject it. | |
2229 | */ | |
2230 | default: | |
2231 | if (!tmp) { | |
6a6ff4ac | 2232 | shost_printk(KERN_ERR, instance, "rejecting message "); |
c28bda25 RZ |
2233 | spi_print_msg(extended_msg); |
2234 | printk("\n"); | |
2235 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2236 | scmd_printk(KERN_INFO, cmd, |
2237 | "rejecting unknown message %02x\n", | |
2238 | tmp); | |
c28bda25 | 2239 | else |
ff50f9ed FT |
2240 | scmd_printk(KERN_INFO, cmd, |
2241 | "rejecting unknown extended message code %02x, length %d\n", | |
2242 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2243 | |
2244 | msgout = MESSAGE_REJECT; | |
2245 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2246 | break; | |
2247 | } /* switch (tmp) */ | |
2248 | break; | |
2249 | case PHASE_MSGOUT: | |
2250 | len = 1; | |
2251 | data = &msgout; | |
2252 | hostdata->last_message = msgout; | |
2253 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2254 | if (msgout == ABORT) { | |
c28bda25 RZ |
2255 | hostdata->connected = NULL; |
2256 | cmd->result = DID_ERROR << 16; | |
677e0194 | 2257 | complete_cmd(instance, cmd); |
e3c3da67 | 2258 | maybe_release_dma_irq(instance); |
cd400825 | 2259 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2260 | return; |
2261 | } | |
2262 | msgout = NOP; | |
2263 | break; | |
2264 | case PHASE_CMDOUT: | |
2265 | len = cmd->cmd_len; | |
2266 | data = cmd->cmnd; | |
2267 | /* | |
2268 | * XXX for performance reasons, on machines with a | |
2269 | * PSEUDO-DMA architecture we should probably | |
2270 | * use the dma transfer function. | |
2271 | */ | |
2272 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2273 | break; | |
2274 | case PHASE_STATIN: | |
2275 | len = 1; | |
2276 | data = &tmp; | |
2277 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2278 | cmd->SCp.Status = tmp; | |
2279 | break; | |
2280 | default: | |
6a6ff4ac | 2281 | shost_printk(KERN_ERR, instance, "unknown phase\n"); |
8ad3a593 | 2282 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2283 | } /* switch(phase) */ |
686f3990 | 2284 | } else { |
11d2f63b | 2285 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2286 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2287 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2288 | } |
11d2f63b | 2289 | } |
1da177e4 LT |
2290 | } |
2291 | ||
2292 | /* | |
2293 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2294 | * | |
c28bda25 | 2295 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2296 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2297 | * nexus has been reestablished, |
c28bda25 | 2298 | * |
1da177e4 LT |
2299 | * Inputs : instance - this instance of the NCR5380. |
2300 | * | |
2301 | */ | |
2302 | ||
2303 | ||
e3f463b0 FT |
2304 | /* it might eventually prove necessary to do a dma setup on |
2305 | reselection, but it doesn't seem to be needed now -- sam */ | |
2306 | ||
c28bda25 | 2307 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2308 | { |
e8a60144 | 2309 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2310 | unsigned char target_mask; |
e3f463b0 | 2311 | unsigned char lun; |
1da177e4 | 2312 | #ifdef SUPPORT_TAGS |
c28bda25 | 2313 | unsigned char tag; |
1da177e4 | 2314 | #endif |
c28bda25 | 2315 | unsigned char msg[3]; |
e3f463b0 FT |
2316 | int __maybe_unused len; |
2317 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
32b26a10 FT |
2318 | struct NCR5380_cmd *ncmd; |
2319 | struct scsi_cmnd *tmp; | |
c28bda25 RZ |
2320 | |
2321 | /* | |
2322 | * Disable arbitration, etc. since the host adapter obviously | |
2323 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2324 | */ | |
2325 | ||
2326 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2327 | |
2328 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2329 | ||
b746545f | 2330 | dsprintk(NDEBUG_RESELECTION, instance, "reselect\n"); |
c28bda25 RZ |
2331 | |
2332 | /* | |
2333 | * At this point, we have detected that our SCSI ID is on the bus, | |
2334 | * SEL is true and BSY was false for at least one bus settle delay | |
2335 | * (400 ns). | |
2336 | * | |
2337 | * We must assert BSY ourselves, until the target drops the SEL | |
2338 | * signal. | |
2339 | */ | |
2340 | ||
2341 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2342 | if (NCR5380_poll_politely(instance, |
2343 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2344 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2345 | return; | |
2346 | } | |
c28bda25 RZ |
2347 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2348 | ||
2349 | /* | |
2350 | * Wait for target to go into MSGIN. | |
2351 | */ | |
2352 | ||
72064a78 FT |
2353 | if (NCR5380_poll_politely(instance, |
2354 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2355 | do_abort(instance); | |
2356 | return; | |
2357 | } | |
c28bda25 | 2358 | |
e3f463b0 FT |
2359 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2360 | /* acknowledge toggle to MSGIN */ | |
2361 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2362 | ||
2363 | /* peek at the byte without really hitting the bus */ | |
2364 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2365 | #else | |
c28bda25 RZ |
2366 | len = 1; |
2367 | data = msg; | |
2368 | phase = PHASE_MSGIN; | |
2369 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2370 | |
2371 | if (len) { | |
2372 | do_abort(instance); | |
2373 | return; | |
2374 | } | |
e3f463b0 | 2375 | #endif |
c28bda25 RZ |
2376 | |
2377 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2378 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2379 | spi_print_msg(msg); |
72064a78 | 2380 | printk("\n"); |
c28bda25 RZ |
2381 | do_abort(instance); |
2382 | return; | |
2383 | } | |
72064a78 | 2384 | lun = msg[0] & 0x07; |
1da177e4 | 2385 | |
e3f463b0 | 2386 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2387 | /* If the phase is still MSGIN, the target wants to send some more |
2388 | * messages. In case it supports tagged queuing, this is probably a | |
2389 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2390 | */ | |
2391 | tag = TAG_NONE; | |
ca513fc9 | 2392 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2393 | /* Accept previous IDENTIFY message by clearing ACK */ |
2394 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2395 | len = 2; | |
2396 | data = msg + 1; | |
2397 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2398 | msg[1] == SIMPLE_QUEUE_TAG) | |
2399 | tag = msg[2]; | |
b746545f FT |
2400 | dsprintk(NDEBUG_TAGS, instance, "reselect: target mask %02x, lun %d sent tag %d\n", |
2401 | target_mask, lun, tag); | |
c28bda25 | 2402 | } |
1da177e4 | 2403 | #endif |
c28bda25 RZ |
2404 | |
2405 | /* | |
2406 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2407 | * just reestablished, and remove it from the disconnected queue. | |
2408 | */ | |
2409 | ||
32b26a10 FT |
2410 | tmp = NULL; |
2411 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { | |
2412 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2413 | ||
2414 | if (target_mask == (1 << scmd_id(cmd)) && | |
2415 | lun == (u8)cmd->device->lun | |
1da177e4 | 2416 | #ifdef SUPPORT_TAGS |
32b26a10 | 2417 | && (tag == cmd->tag) |
1da177e4 | 2418 | #endif |
c28bda25 | 2419 | ) { |
32b26a10 FT |
2420 | list_del(&ncmd->list); |
2421 | tmp = cmd; | |
c28bda25 RZ |
2422 | break; |
2423 | } | |
1da177e4 | 2424 | } |
c28bda25 | 2425 | |
0d3d9a42 FT |
2426 | if (tmp) { |
2427 | dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, | |
2428 | "reselect: removed %p from disconnected queue\n", tmp); | |
2429 | } else { | |
2430 | ||
1da177e4 | 2431 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2432 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2433 | target_mask, lun, tag); | |
2434 | #else | |
2435 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2436 | target_mask, lun); | |
1da177e4 | 2437 | #endif |
c28bda25 RZ |
2438 | /* |
2439 | * Since we have an established nexus that we can't do anything | |
2440 | * with, we must abort it. | |
2441 | */ | |
2442 | do_abort(instance); | |
2443 | return; | |
2444 | } | |
1da177e4 | 2445 | |
e3f463b0 FT |
2446 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2447 | /* engage dma setup for the command we just saw */ | |
2448 | { | |
2449 | void *d; | |
2450 | unsigned long count; | |
2451 | ||
2452 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2453 | count = tmp->SCp.buffer->length; | |
2454 | d = sg_virt(tmp->SCp.buffer); | |
2455 | } else { | |
2456 | count = tmp->SCp.this_residual; | |
2457 | d = tmp->SCp.ptr; | |
2458 | } | |
2459 | /* setup this command for dma if not already */ | |
2460 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
cd46140a FT |
2461 | sun3scsi_dma_setup(instance, d, count, |
2462 | rq_data_dir(tmp->request)); | |
e3f463b0 FT |
2463 | sun3_dma_setup_done = tmp; |
2464 | } | |
2465 | } | |
2466 | ||
2467 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2468 | #endif | |
2469 | ||
c28bda25 RZ |
2470 | /* Accept message by clearing ACK */ |
2471 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2472 | |
e3f463b0 FT |
2473 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2474 | /* If the phase is still MSGIN, the target wants to send some more | |
2475 | * messages. In case it supports tagged queuing, this is probably a | |
2476 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2477 | */ | |
2478 | tag = TAG_NONE; | |
2479 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2480 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2481 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2482 | len = 2; | |
2483 | data = msg + 1; | |
2484 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2485 | msg[1] == SIMPLE_QUEUE_TAG) | |
2486 | tag = msg[2]; | |
b746545f FT |
2487 | dsprintk(NDEBUG_TAGS, instance, "reselect: target mask %02x, lun %d sent tag %d\n" |
2488 | target_mask, lun, tag); | |
e3f463b0 FT |
2489 | } |
2490 | #endif | |
2491 | ||
c28bda25 | 2492 | hostdata->connected = tmp; |
b746545f FT |
2493 | dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n", |
2494 | scmd_id(tmp), tmp->device->lun, tmp->tag); | |
1da177e4 LT |
2495 | } |
2496 | ||
2497 | ||
8b00c3d5 FT |
2498 | /** |
2499 | * list_find_cmd - test for presence of a command in a linked list | |
2500 | * @haystack: list of commands | |
2501 | * @needle: command to search for | |
1da177e4 LT |
2502 | */ |
2503 | ||
8b00c3d5 FT |
2504 | static bool list_find_cmd(struct list_head *haystack, |
2505 | struct scsi_cmnd *needle) | |
2506 | { | |
2507 | struct NCR5380_cmd *ncmd; | |
2508 | ||
2509 | list_for_each_entry(ncmd, haystack, list) | |
2510 | if (NCR5380_to_scmd(ncmd) == needle) | |
2511 | return true; | |
2512 | return false; | |
2513 | } | |
2514 | ||
2515 | /** | |
2516 | * list_remove_cmd - remove a command from linked list | |
2517 | * @haystack: list of commands | |
2518 | * @needle: command to remove | |
2519 | */ | |
2520 | ||
2521 | static bool list_del_cmd(struct list_head *haystack, | |
2522 | struct scsi_cmnd *needle) | |
2523 | { | |
2524 | if (list_find_cmd(haystack, needle)) { | |
2525 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle); | |
2526 | ||
2527 | list_del(&ncmd->list); | |
2528 | return true; | |
2529 | } | |
2530 | return false; | |
2531 | } | |
2532 | ||
2533 | /** | |
2534 | * NCR5380_abort - scsi host eh_abort_handler() method | |
2535 | * @cmd: the command to be aborted | |
2536 | * | |
2537 | * Try to abort a given command by removing it from queues and/or sending | |
2538 | * the target an abort message. This may not succeed in causing a target | |
2539 | * to abort the command. Nonetheless, the low-level driver must forget about | |
2540 | * the command because the mid-layer reclaims it and it may be re-issued. | |
2541 | * | |
2542 | * The normal path taken by a command is as follows. For EH we trace this | |
2543 | * same path to locate and abort the command. | |
2544 | * | |
2545 | * unissued -> selecting -> [unissued -> selecting ->]... connected -> | |
2546 | * [disconnected -> connected ->]... | |
2547 | * [autosense -> connected ->] done | |
2548 | * | |
2549 | * If cmd is unissued then just remove it. | |
2550 | * If cmd is disconnected, try to select the target. | |
2551 | * If cmd is connected, try to send an abort message. | |
2552 | * If cmd is waiting for autosense, give it a chance to complete but check | |
2553 | * that it isn't left connected. | |
2554 | * If cmd was not found at all then presumably it has already been completed, | |
2555 | * in which case return SUCCESS to try to avoid further EH measures. | |
2556 | * If the command has not completed yet, we must not fail to find it. | |
2557 | */ | |
2558 | ||
2559 | static int NCR5380_abort(struct scsi_cmnd *cmd) | |
1da177e4 | 2560 | { |
c28bda25 | 2561 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2562 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2563 | unsigned long flags; |
8b00c3d5 | 2564 | int result = SUCCESS; |
1da177e4 | 2565 | |
11d2f63b | 2566 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2567 | |
32b26a10 | 2568 | #if (NDEBUG & NDEBUG_ANY) |
8b00c3d5 | 2569 | scmd_printk(KERN_INFO, cmd, __func__); |
32b26a10 | 2570 | #endif |
e5c3fddf FT |
2571 | NCR5380_dprint(NDEBUG_ANY, instance); |
2572 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2573 | |
8b00c3d5 FT |
2574 | if (list_del_cmd(&hostdata->unissued, cmd)) { |
2575 | dsprintk(NDEBUG_ABORT, instance, | |
2576 | "abort: removed %p from issue queue\n", cmd); | |
2577 | cmd->result = DID_ABORT << 16; | |
2578 | cmd->scsi_done(cmd); /* No tag or busy flag to worry about */ | |
2579 | } | |
2580 | ||
707d62b3 FT |
2581 | if (hostdata->selecting == cmd) { |
2582 | dsprintk(NDEBUG_ABORT, instance, | |
2583 | "abort: cmd %p == selecting\n", cmd); | |
2584 | hostdata->selecting = NULL; | |
2585 | cmd->result = DID_ABORT << 16; | |
2586 | complete_cmd(instance, cmd); | |
2587 | goto out; | |
2588 | } | |
2589 | ||
8b00c3d5 FT |
2590 | if (list_del_cmd(&hostdata->disconnected, cmd)) { |
2591 | dsprintk(NDEBUG_ABORT, instance, | |
2592 | "abort: removed %p from disconnected list\n", cmd); | |
2593 | cmd->result = DID_ERROR << 16; | |
2594 | if (!hostdata->connected) | |
2595 | NCR5380_select(instance, cmd); | |
2596 | if (hostdata->connected != cmd) { | |
2597 | complete_cmd(instance, cmd); | |
2598 | result = FAILED; | |
2599 | goto out; | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | if (hostdata->connected == cmd) { | |
2604 | dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); | |
2605 | hostdata->connected = NULL; | |
2606 | if (do_abort(instance)) { | |
2607 | set_host_byte(cmd, DID_ERROR); | |
2608 | complete_cmd(instance, cmd); | |
2609 | result = FAILED; | |
2610 | goto out; | |
2611 | } | |
2612 | set_host_byte(cmd, DID_ABORT); | |
2613 | #ifdef REAL_DMA | |
2614 | hostdata->dma_len = 0; | |
2615 | #endif | |
2616 | if (cmd->cmnd[0] == REQUEST_SENSE) | |
2617 | complete_cmd(instance, cmd); | |
2618 | else { | |
2619 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); | |
2620 | ||
2621 | /* Perform autosense for this command */ | |
2622 | list_add(&ncmd->list, &hostdata->autosense); | |
2623 | } | |
2624 | } | |
2625 | ||
2626 | if (list_find_cmd(&hostdata->autosense, cmd)) { | |
2627 | dsprintk(NDEBUG_ABORT, instance, | |
2628 | "abort: found %p on sense queue\n", cmd); | |
2629 | spin_unlock_irqrestore(&hostdata->lock, flags); | |
2630 | queue_work(hostdata->work_q, &hostdata->main_task); | |
2631 | msleep(1000); | |
2632 | spin_lock_irqsave(&hostdata->lock, flags); | |
2633 | if (list_del_cmd(&hostdata->autosense, cmd)) { | |
2634 | dsprintk(NDEBUG_ABORT, instance, | |
2635 | "abort: removed %p from sense queue\n", cmd); | |
2636 | set_host_byte(cmd, DID_ABORT); | |
2637 | complete_cmd(instance, cmd); | |
2638 | goto out; | |
2639 | } | |
2640 | } | |
2641 | ||
2642 | if (hostdata->connected == cmd) { | |
2643 | dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); | |
2644 | hostdata->connected = NULL; | |
2645 | if (do_abort(instance)) { | |
2646 | set_host_byte(cmd, DID_ERROR); | |
2647 | complete_cmd(instance, cmd); | |
2648 | result = FAILED; | |
2649 | goto out; | |
2650 | } | |
2651 | set_host_byte(cmd, DID_ABORT); | |
2652 | #ifdef REAL_DMA | |
2653 | hostdata->dma_len = 0; | |
2654 | #endif | |
2655 | complete_cmd(instance, cmd); | |
2656 | } | |
2657 | ||
2658 | out: | |
2659 | if (result == FAILED) | |
2660 | dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd); | |
2661 | else | |
2662 | dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); | |
2663 | ||
2664 | queue_work(hostdata->work_q, &hostdata->main_task); | |
2665 | maybe_release_dma_irq(instance); | |
11d2f63b | 2666 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2667 | |
8b00c3d5 | 2668 | return result; |
1da177e4 LT |
2669 | } |
2670 | ||
2671 | ||
3be1b3ea FT |
2672 | /** |
2673 | * NCR5380_bus_reset - reset the SCSI bus | |
2674 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2675 | * |
3be1b3ea | 2676 | * Returns SUCCESS |
c28bda25 | 2677 | */ |
1da177e4 | 2678 | |
710ddd0d | 2679 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2680 | { |
e3c3da67 FT |
2681 | struct Scsi_Host *instance = cmd->device->host; |
2682 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2683 | int i; |
2684 | unsigned long flags; | |
62717f53 | 2685 | struct NCR5380_cmd *ncmd; |
1da177e4 | 2686 | |
11d2f63b | 2687 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2688 | |
2689 | #if (NDEBUG & NDEBUG_ANY) | |
62717f53 | 2690 | scmd_printk(KERN_INFO, cmd, __func__); |
3be1b3ea | 2691 | #endif |
e5c3fddf FT |
2692 | NCR5380_dprint(NDEBUG_ANY, instance); |
2693 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2694 | |
2695 | do_reset(instance); | |
c28bda25 | 2696 | |
c28bda25 | 2697 | /* reset NCR registers */ |
c28bda25 RZ |
2698 | NCR5380_write(MODE_REG, MR_BASE); |
2699 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2700 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2701 | |
c28bda25 RZ |
2702 | /* After the reset, there are no more connected or disconnected commands |
2703 | * and no busy units; so clear the low-level status here to avoid | |
2704 | * conflicts when the mid-level code tries to wake up the affected | |
2705 | * commands! | |
2706 | */ | |
2707 | ||
707d62b3 FT |
2708 | hostdata->selecting = NULL; |
2709 | ||
62717f53 FT |
2710 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { |
2711 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
32b26a10 | 2712 | |
62717f53 FT |
2713 | set_host_byte(cmd, DID_RESET); |
2714 | cmd->scsi_done(cmd); | |
f27db8eb FT |
2715 | } |
2716 | ||
62717f53 FT |
2717 | list_for_each_entry(ncmd, &hostdata->autosense, list) { |
2718 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
f27db8eb | 2719 | |
62717f53 FT |
2720 | set_host_byte(cmd, DID_RESET); |
2721 | cmd->scsi_done(cmd); | |
2722 | } | |
32b26a10 | 2723 | |
62717f53 FT |
2724 | if (hostdata->connected) { |
2725 | set_host_byte(hostdata->connected, DID_RESET); | |
2726 | complete_cmd(instance, hostdata->connected); | |
2727 | hostdata->connected = NULL; | |
2728 | } | |
2729 | ||
2730 | if (hostdata->sensing) { | |
2731 | set_host_byte(hostdata->connected, DID_RESET); | |
2732 | complete_cmd(instance, hostdata->sensing); | |
2733 | hostdata->sensing = NULL; | |
2734 | } | |
32b26a10 | 2735 | |
1da177e4 | 2736 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2737 | free_all_tags(hostdata); |
1da177e4 | 2738 | #endif |
c28bda25 RZ |
2739 | for (i = 0; i < 8; ++i) |
2740 | hostdata->busy[i] = 0; | |
1da177e4 | 2741 | #ifdef REAL_DMA |
c28bda25 | 2742 | hostdata->dma_len = 0; |
1da177e4 | 2743 | #endif |
e3c3da67 | 2744 | |
62717f53 | 2745 | queue_work(hostdata->work_q, &hostdata->main_task); |
e3c3da67 | 2746 | maybe_release_dma_irq(instance); |
11d2f63b | 2747 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2748 | |
2b0f834c | 2749 | return SUCCESS; |
1da177e4 | 2750 | } |