Commit | Line | Data |
---|---|---|
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 | ||
710ddd0d | 178 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 179 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 180 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
181 | |
182 | #define HOSTNO instance->host_no | |
1da177e4 | 183 | |
636b1ec8 FT |
184 | static int do_abort(struct Scsi_Host *); |
185 | static void do_reset(struct Scsi_Host *); | |
186 | ||
1da177e4 LT |
187 | #ifdef SUPPORT_TAGS |
188 | ||
189 | /* | |
190 | * Functions for handling tagged queuing | |
191 | * ===================================== | |
192 | * | |
193 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
194 | * | |
195 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
196 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
197 | * command has been preempted for a long time. My solution: a bitfield for | |
198 | * remembering used tags. | |
199 | * | |
200 | * There's also the problem that each target has a certain queue size, but we | |
201 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
202 | * returned. So, in this case, the driver internal queue size assumption is | |
203 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 204 | * target. |
1da177e4 LT |
205 | * |
206 | * We're also not allowed running tagged commands as long as an untagged | |
207 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
208 | * condition _must_ be untagged. To keep track whether an untagged command has | |
209 | * been issued, the host->busy array is still employed, as it is without | |
210 | * support for tagged queuing. | |
211 | * | |
212 | * One could suspect that there are possible race conditions between | |
213 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
214 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
215 | * which already guaranteed to be running at most once. It is also the only | |
216 | * place where tags/LUNs are allocated. So no other allocation can slip | |
217 | * between that pair, there could only happen a reselection, which can free a | |
218 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
219 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
220 | */ | |
221 | ||
ca513fc9 | 222 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 223 | { |
c28bda25 | 224 | int target, lun; |
61d739a4 | 225 | struct tag_alloc *ta; |
c28bda25 | 226 | |
ca513fc9 | 227 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
228 | return; |
229 | ||
230 | for (target = 0; target < 8; ++target) { | |
231 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 232 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
233 | bitmap_zero(ta->allocated, MAX_TAGS); |
234 | ta->nr_allocated = 0; | |
235 | /* At the beginning, assume the maximum queue size we could | |
236 | * support (MAX_TAGS). This value will be decreased if the target | |
237 | * returns QUEUE_FULL status. | |
238 | */ | |
239 | ta->queue_size = MAX_TAGS; | |
240 | } | |
1da177e4 | 241 | } |
1da177e4 LT |
242 | } |
243 | ||
244 | ||
245 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
246 | * busy by an untagged command. If the command should use tagged queuing, also | |
247 | * check that there is a free tag and the target's queue won't overflow. This | |
248 | * function should be called with interrupts disabled to avoid race | |
249 | * conditions. | |
c28bda25 | 250 | */ |
1da177e4 | 251 | |
710ddd0d | 252 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 253 | { |
9cb78c16 | 254 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
255 | struct Scsi_Host *instance = cmd->device->host; |
256 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 257 | |
9cb78c16 | 258 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
259 | return 1; |
260 | if (!should_be_tagged || | |
ca513fc9 FT |
261 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
262 | !cmd->device->tagged_supported) | |
c28bda25 | 263 | return 0; |
61d739a4 FT |
264 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
265 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
266 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
267 | scmd_id(cmd), lun); | |
c28bda25 RZ |
268 | return 1; |
269 | } | |
270 | return 0; | |
1da177e4 LT |
271 | } |
272 | ||
273 | ||
274 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
275 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
276 | * untagged. | |
277 | */ | |
278 | ||
710ddd0d | 279 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 280 | { |
9cb78c16 | 281 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
282 | struct Scsi_Host *instance = cmd->device->host; |
283 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
284 | |
285 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
286 | * an untagged command. | |
287 | */ | |
288 | if (!should_be_tagged || | |
ca513fc9 FT |
289 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
290 | !cmd->device->tagged_supported) { | |
c28bda25 | 291 | cmd->tag = TAG_NONE; |
9cb78c16 | 292 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
293 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
294 | scmd_id(cmd), lun); | |
c28bda25 | 295 | } else { |
61d739a4 | 296 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
297 | |
298 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
299 | set_bit(cmd->tag, ta->allocated); | |
300 | ta->nr_allocated++; | |
dbb6b350 FT |
301 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
302 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 303 | } |
1da177e4 LT |
304 | } |
305 | ||
306 | ||
307 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
308 | * unlock the LUN. | |
309 | */ | |
310 | ||
710ddd0d | 311 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 312 | { |
9cb78c16 | 313 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
314 | struct Scsi_Host *instance = cmd->device->host; |
315 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
316 | |
317 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 318 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
319 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
320 | scmd_id(cmd), lun); | |
c28bda25 | 321 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
322 | shost_printk(KERN_NOTICE, instance, |
323 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 324 | } else { |
61d739a4 | 325 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
326 | clear_bit(cmd->tag, ta->allocated); |
327 | ta->nr_allocated--; | |
dbb6b350 FT |
328 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
329 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 330 | } |
1da177e4 LT |
331 | } |
332 | ||
333 | ||
ca513fc9 | 334 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 335 | { |
c28bda25 | 336 | int target, lun; |
61d739a4 | 337 | struct tag_alloc *ta; |
c28bda25 | 338 | |
ca513fc9 | 339 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
340 | return; |
341 | ||
342 | for (target = 0; target < 8; ++target) { | |
343 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 344 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
345 | bitmap_zero(ta->allocated, MAX_TAGS); |
346 | ta->nr_allocated = 0; | |
347 | } | |
1da177e4 | 348 | } |
1da177e4 LT |
349 | } |
350 | ||
351 | #endif /* SUPPORT_TAGS */ | |
352 | ||
353 | ||
354 | /* | |
710ddd0d | 355 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
356 | * |
357 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
358 | * transfer. This is possible if the scatter buffers lie on | |
359 | * physical contiguous addresses. | |
360 | * | |
710ddd0d | 361 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 362 | * The command to work on. The first scatter buffer's data are |
25985edc | 363 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
364 | */ |
365 | ||
710ddd0d | 366 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 367 | { |
e3f463b0 | 368 | #if !defined(CONFIG_SUN3) |
c28bda25 | 369 | unsigned long endaddr; |
1da177e4 | 370 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
371 | unsigned long oldlen = cmd->SCp.this_residual; |
372 | int cnt = 1; | |
1da177e4 LT |
373 | #endif |
374 | ||
c28bda25 RZ |
375 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
376 | cmd->SCp.buffers_residual && | |
5a1cb47f | 377 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 378 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 379 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 380 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 381 | ++cnt; |
1da177e4 | 382 | #endif |
c28bda25 RZ |
383 | ++cmd->SCp.buffer; |
384 | --cmd->SCp.buffers_residual; | |
385 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
386 | endaddr += cmd->SCp.buffer->length; | |
387 | } | |
1da177e4 | 388 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 389 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 390 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 391 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 392 | #endif |
e3f463b0 | 393 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
394 | } |
395 | ||
ff50f9ed FT |
396 | /** |
397 | * initialize_SCp - init the scsi pointer field | |
398 | * @cmd: command block to set up | |
1da177e4 | 399 | * |
ff50f9ed | 400 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
401 | */ |
402 | ||
710ddd0d | 403 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 404 | { |
c28bda25 RZ |
405 | /* |
406 | * Initialize the Scsi Pointer field so that all of the commands in the | |
407 | * various queues are valid. | |
1da177e4 | 408 | */ |
c28bda25 | 409 | |
9e0fe44d BH |
410 | if (scsi_bufflen(cmd)) { |
411 | cmd->SCp.buffer = scsi_sglist(cmd); | |
412 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 413 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
414 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
415 | /* ++roman: Try to merge some scatter-buffers if they are at | |
416 | * contiguous physical addresses. | |
417 | */ | |
418 | merge_contiguous_buffers(cmd); | |
419 | } else { | |
420 | cmd->SCp.buffer = NULL; | |
421 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
422 | cmd->SCp.ptr = NULL; |
423 | cmd->SCp.this_residual = 0; | |
c28bda25 | 424 | } |
1da177e4 LT |
425 | } |
426 | ||
636b1ec8 | 427 | /** |
b32ade12 | 428 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 429 | * @instance: controller to poll |
b32ade12 FT |
430 | * @reg1: 5380 register to poll |
431 | * @bit1: Bitmask to check | |
432 | * @val1: Expected value | |
433 | * @reg2: Second 5380 register to poll | |
434 | * @bit2: Second bitmask to check | |
435 | * @val2: Second expected value | |
2f854b82 | 436 | * @wait: Time-out in jiffies |
636b1ec8 | 437 | * |
2f854b82 FT |
438 | * Polls the chip in a reasonably efficient manner waiting for an |
439 | * event to occur. After a short quick poll we begin to yield the CPU | |
440 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
441 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 442 | * |
b32ade12 | 443 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
444 | */ |
445 | ||
b32ade12 FT |
446 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
447 | int reg1, int bit1, int val1, | |
448 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 449 | { |
2f854b82 FT |
450 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
451 | unsigned long deadline = jiffies + wait; | |
452 | unsigned long n; | |
453 | ||
454 | /* Busy-wait for up to 10 ms */ | |
455 | n = min(10000U, jiffies_to_usecs(wait)); | |
456 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 457 | n /= 2000; |
2f854b82 | 458 | do { |
b32ade12 FT |
459 | if ((NCR5380_read(reg1) & bit1) == val1) |
460 | return 0; | |
461 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
462 | return 0; |
463 | cpu_relax(); | |
2f854b82 FT |
464 | } while (n--); |
465 | ||
466 | if (irqs_disabled() || in_interrupt()) | |
467 | return -ETIMEDOUT; | |
636b1ec8 | 468 | |
2f854b82 FT |
469 | /* Repeatedly sleep for 1 ms until deadline */ |
470 | while (time_is_after_jiffies(deadline)) { | |
471 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
472 | if ((NCR5380_read(reg1) & bit1) == val1) |
473 | return 0; | |
474 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 475 | return 0; |
636b1ec8 | 476 | } |
2f854b82 | 477 | |
636b1ec8 FT |
478 | return -ETIMEDOUT; |
479 | } | |
480 | ||
b32ade12 FT |
481 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
482 | int reg, int bit, int val, int wait) | |
483 | { | |
484 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
485 | reg, bit, val, wait); | |
486 | } | |
487 | ||
1da177e4 LT |
488 | #if NDEBUG |
489 | static struct { | |
c28bda25 RZ |
490 | unsigned char mask; |
491 | const char *name; | |
492 | } signals[] = { | |
493 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
494 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
495 | { SR_SEL, "SEL" }, {0, NULL} | |
496 | }, basrs[] = { | |
497 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
498 | }, icrs[] = { | |
499 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
500 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
501 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
502 | {0, NULL} | |
503 | }, mrs[] = { | |
504 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
505 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
506 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
507 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
508 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
509 | {0, NULL} | |
510 | }; | |
1da177e4 | 511 | |
ff50f9ed FT |
512 | /** |
513 | * NCR5380_print - print scsi bus signals | |
514 | * @instance: adapter state to dump | |
1da177e4 | 515 | * |
ff50f9ed | 516 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
517 | */ |
518 | ||
c28bda25 RZ |
519 | static void NCR5380_print(struct Scsi_Host *instance) |
520 | { | |
521 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 522 | |
c28bda25 RZ |
523 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
524 | status = NCR5380_read(STATUS_REG); | |
525 | mr = NCR5380_read(MODE_REG); | |
526 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
527 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 528 | |
c28bda25 RZ |
529 | printk("STATUS_REG: %02x ", status); |
530 | for (i = 0; signals[i].mask; ++i) | |
531 | if (status & signals[i].mask) | |
532 | printk(",%s", signals[i].name); | |
533 | printk("\nBASR: %02x ", basr); | |
534 | for (i = 0; basrs[i].mask; ++i) | |
535 | if (basr & basrs[i].mask) | |
536 | printk(",%s", basrs[i].name); | |
537 | printk("\nICR: %02x ", icr); | |
538 | for (i = 0; icrs[i].mask; ++i) | |
539 | if (icr & icrs[i].mask) | |
540 | printk(",%s", icrs[i].name); | |
541 | printk("\nMODE: %02x ", mr); | |
542 | for (i = 0; mrs[i].mask; ++i) | |
543 | if (mr & mrs[i].mask) | |
544 | printk(",%s", mrs[i].name); | |
545 | printk("\n"); | |
1da177e4 LT |
546 | } |
547 | ||
548 | static struct { | |
c28bda25 RZ |
549 | unsigned char value; |
550 | const char *name; | |
1da177e4 | 551 | } phases[] = { |
c28bda25 RZ |
552 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
553 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
554 | {PHASE_UNKNOWN, "UNKNOWN"} | |
555 | }; | |
1da177e4 | 556 | |
ff50f9ed FT |
557 | /** |
558 | * NCR5380_print_phase - show SCSI phase | |
559 | * @instance: adapter to dump | |
1da177e4 | 560 | * |
ff50f9ed | 561 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 562 | * |
ff50f9ed | 563 | * Locks: none |
1da177e4 LT |
564 | */ |
565 | ||
566 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
567 | { | |
c28bda25 RZ |
568 | unsigned char status; |
569 | int i; | |
570 | ||
571 | status = NCR5380_read(STATUS_REG); | |
572 | if (!(status & SR_REQ)) | |
573 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
574 | else { | |
575 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
576 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
577 | ; | |
578 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
579 | } | |
1da177e4 LT |
580 | } |
581 | ||
1da177e4 LT |
582 | #endif |
583 | ||
8c32513b FT |
584 | /** |
585 | * NCR58380_info - report driver and host information | |
586 | * @instance: relevant scsi host instance | |
1da177e4 | 587 | * |
8c32513b | 588 | * For use as the host template info() handler. |
1da177e4 | 589 | * |
8c32513b | 590 | * Locks: none |
1da177e4 LT |
591 | */ |
592 | ||
8c32513b | 593 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 594 | { |
8c32513b FT |
595 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
596 | ||
597 | return hostdata->info; | |
598 | } | |
599 | ||
600 | static void prepare_info(struct Scsi_Host *instance) | |
601 | { | |
602 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
603 | ||
604 | snprintf(hostdata->info, sizeof(hostdata->info), | |
605 | "%s, io_port 0x%lx, n_io_port %d, " | |
606 | "base 0x%lx, irq %d, " | |
607 | "can_queue %d, cmd_per_lun %d, " | |
608 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 609 | "flags { %s%s}, " |
8c32513b FT |
610 | "options { %s} ", |
611 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
612 | instance->base, instance->irq, | |
613 | instance->can_queue, instance->cmd_per_lun, | |
614 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 615 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 616 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
617 | #ifdef DIFFERENTIAL |
618 | "DIFFERENTIAL " | |
619 | #endif | |
1da177e4 | 620 | #ifdef REAL_DMA |
8c32513b | 621 | "REAL_DMA " |
1da177e4 LT |
622 | #endif |
623 | #ifdef PARITY | |
8c32513b | 624 | "PARITY " |
1da177e4 LT |
625 | #endif |
626 | #ifdef SUPPORT_TAGS | |
8c32513b | 627 | "SUPPORT_TAGS " |
1da177e4 | 628 | #endif |
8c32513b | 629 | ""); |
1da177e4 LT |
630 | } |
631 | ||
ff50f9ed FT |
632 | /** |
633 | * NCR5380_init - initialise an NCR5380 | |
634 | * @instance: adapter to configure | |
635 | * @flags: control flags | |
1da177e4 | 636 | * |
ff50f9ed FT |
637 | * Initializes *instance and corresponding 5380 chip, |
638 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
639 | * |
640 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 641 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 642 | * |
ff50f9ed | 643 | * Returns 0 for success |
1da177e4 LT |
644 | */ |
645 | ||
95fde7a8 | 646 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 647 | { |
e8a60144 | 648 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 649 | int i; |
2f854b82 | 650 | unsigned long deadline; |
c28bda25 | 651 | |
a53a21e4 | 652 | hostdata->host = instance; |
c28bda25 RZ |
653 | hostdata->id_mask = 1 << instance->this_id; |
654 | hostdata->id_higher_mask = 0; | |
655 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
656 | if (i > hostdata->id_mask) | |
657 | hostdata->id_higher_mask |= i; | |
658 | for (i = 0; i < 8; ++i) | |
659 | hostdata->busy[i] = 0; | |
1da177e4 | 660 | #ifdef SUPPORT_TAGS |
ca513fc9 | 661 | init_tags(hostdata); |
1da177e4 LT |
662 | #endif |
663 | #if defined (REAL_DMA) | |
c28bda25 | 664 | hostdata->dma_len = 0; |
1da177e4 | 665 | #endif |
11d2f63b | 666 | spin_lock_init(&hostdata->lock); |
c28bda25 RZ |
667 | hostdata->connected = NULL; |
668 | hostdata->issue_queue = NULL; | |
669 | hostdata->disconnected_queue = NULL; | |
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 | ||
ff50f9ed FT |
770 | /** |
771 | * NCR5380_queue_command - queue a command | |
772 | * @instance: the relevant SCSI adapter | |
773 | * @cmd: SCSI command | |
1da177e4 | 774 | * |
1bb40589 | 775 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
776 | * twiddling done to the host specific fields of cmd. If the |
777 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
778 | */ |
779 | ||
16b29e75 FT |
780 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
781 | struct scsi_cmnd *cmd) | |
1da177e4 | 782 | { |
16b29e75 | 783 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 784 | struct scsi_cmnd *tmp; |
c28bda25 | 785 | unsigned long flags; |
1da177e4 LT |
786 | |
787 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
788 | switch (cmd->cmnd[0]) { |
789 | case WRITE_6: | |
790 | case WRITE_10: | |
dbb6b350 | 791 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 792 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 793 | cmd->scsi_done(cmd); |
c28bda25 RZ |
794 | return 0; |
795 | } | |
1da177e4 LT |
796 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
797 | ||
c28bda25 RZ |
798 | /* |
799 | * We use the host_scribble field as a pointer to the next command | |
800 | * in a queue | |
801 | */ | |
802 | ||
3130d905 | 803 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
804 | cmd->result = 0; |
805 | ||
806 | /* | |
807 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
808 | * commands are added to the head of the queue since any command will | |
809 | * clear the contingent allegiance condition that exists and the | |
810 | * sense data is only guaranteed to be valid while the condition exists. | |
811 | */ | |
812 | ||
c28bda25 RZ |
813 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
814 | * Otherwise a running NCR5380_main may steal the lock. | |
815 | * Lock before actually inserting due to fairness reasons explained in | |
816 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
817 | * to release the lock. | |
818 | * Stop timer for this command while waiting for the lock, or timeouts | |
819 | * may happen (and they really do), and it's no good if the command doesn't | |
820 | * appear in any of the queues. | |
821 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
822 | * because also a timer int can trigger an abort or reset, which would | |
823 | * alter queues and touch the lock. | |
824 | */ | |
e3c3da67 | 825 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
826 | return SCSI_MLQUEUE_HOST_BUSY; |
827 | ||
11d2f63b | 828 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 829 | |
ff50f9ed FT |
830 | /* |
831 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
832 | * commands are added to the head of the queue since any command will | |
833 | * clear the contingent allegiance condition that exists and the | |
834 | * sense data is only guaranteed to be valid while the condition exists. | |
835 | */ | |
836 | ||
c28bda25 | 837 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
3130d905 | 838 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
839 | hostdata->issue_queue = cmd; |
840 | } else { | |
710ddd0d | 841 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
842 | NEXT(tmp); tmp = NEXT(tmp)) |
843 | ; | |
3130d905 | 844 | SET_NEXT(tmp, cmd); |
c28bda25 | 845 | } |
11d2f63b | 846 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 847 | |
dbb6b350 FT |
848 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
849 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 850 | |
010e89d1 FT |
851 | /* Kick off command processing */ |
852 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 853 | return 0; |
1da177e4 LT |
854 | } |
855 | ||
e3c3da67 FT |
856 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
857 | { | |
858 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
859 | ||
860 | /* Caller does the locking needed to set & test these data atomically */ | |
861 | if (!hostdata->disconnected_queue && | |
862 | !hostdata->issue_queue && | |
863 | !hostdata->connected && | |
864 | !hostdata->retain_dma_intr) | |
865 | NCR5380_release_dma_irq(instance); | |
866 | } | |
867 | ||
ff50f9ed FT |
868 | /** |
869 | * NCR5380_main - NCR state machines | |
1da177e4 | 870 | * |
ff50f9ed FT |
871 | * NCR5380_main is a coroutine that runs as long as more work can |
872 | * be done on the NCR5380 host adapters in a system. Both | |
873 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
874 | * in case it is not running. | |
c28bda25 | 875 | * |
ff50f9ed | 876 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
877 | */ |
878 | ||
b312b38c | 879 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 880 | { |
a53a21e4 FT |
881 | struct NCR5380_hostdata *hostdata = |
882 | container_of(work, struct NCR5380_hostdata, main_task); | |
883 | struct Scsi_Host *instance = hostdata->host; | |
710ddd0d | 884 | struct scsi_cmnd *tmp, *prev; |
c28bda25 | 885 | int done; |
c28bda25 RZ |
886 | |
887 | /* | |
c28bda25 RZ |
888 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
889 | * because also a timer int can trigger an abort or reset, which can | |
890 | * alter queues and touch the Falcon lock. | |
891 | */ | |
892 | ||
11d2f63b | 893 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 894 | do { |
c28bda25 RZ |
895 | done = 1; |
896 | ||
897 | if (!hostdata->connected) { | |
d65e634a | 898 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
899 | /* |
900 | * Search through the issue_queue for a command destined | |
901 | * for a target that's not busy. | |
902 | */ | |
1da177e4 | 903 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 904 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
905 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
906 | ; | |
907 | /*printk("%p ", tmp);*/ | |
908 | if ((tmp == prev) && tmp) | |
909 | printk(" LOOP\n"); | |
910 | /* else printk("\n"); */ | |
1da177e4 | 911 | #endif |
710ddd0d | 912 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 913 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 914 | u8 lun = tmp->device->lun; |
1da177e4 | 915 | |
0d3d9a42 FT |
916 | dsprintk(NDEBUG_QUEUES, instance, "main: tmp=%p target=%d busy=%d lun=%d\n", |
917 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], lun); | |
c28bda25 | 918 | /* When we find one, remove it from the issue queue. */ |
c28bda25 | 919 | if ( |
1da177e4 | 920 | #ifdef SUPPORT_TAGS |
c28bda25 | 921 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 922 | #else |
9cb78c16 | 923 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 924 | #endif |
c28bda25 | 925 | ) { |
c28bda25 | 926 | if (prev) { |
3130d905 | 927 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 | 928 | } else { |
c28bda25 RZ |
929 | hostdata->issue_queue = NEXT(tmp); |
930 | } | |
3130d905 | 931 | SET_NEXT(tmp, NULL); |
0d3d9a42 FT |
932 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, |
933 | instance, "main: removed %p from issue queue %p\n", | |
934 | tmp, prev); | |
935 | ||
ef1081cb | 936 | hostdata->retain_dma_intr++; |
c28bda25 | 937 | |
c28bda25 RZ |
938 | /* |
939 | * Attempt to establish an I_T_L nexus here. | |
940 | * On success, instance->hostdata->connected is set. | |
941 | * On failure, we must add the command back to the | |
942 | * issue queue so we can keep trying. | |
943 | */ | |
c28bda25 RZ |
944 | /* |
945 | * REQUEST SENSE commands are issued without tagged | |
946 | * queueing, even on SCSI-II devices because the | |
947 | * contingent allegiance condition exists for the | |
948 | * entire unit. | |
949 | */ | |
950 | /* ++roman: ...and the standard also requires that | |
951 | * REQUEST SENSE command are untagged. | |
952 | */ | |
953 | ||
1da177e4 | 954 | #ifdef SUPPORT_TAGS |
c28bda25 | 955 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 956 | #endif |
76f13b93 | 957 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 958 | /* OK or bad target */ |
ef1081cb | 959 | hostdata->retain_dma_intr--; |
e3c3da67 | 960 | maybe_release_dma_irq(instance); |
c28bda25 | 961 | } else { |
1f1b0c74 | 962 | /* Need to retry */ |
3130d905 | 963 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 964 | hostdata->issue_queue = tmp; |
0d3d9a42 FT |
965 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, |
966 | instance, "main: select() failed, %p returned to issue queue\n", | |
967 | tmp); | |
1da177e4 | 968 | #ifdef SUPPORT_TAGS |
c28bda25 | 969 | cmd_free_tag(tmp); |
1da177e4 | 970 | #endif |
ef1081cb | 971 | hostdata->retain_dma_intr--; |
1d3db59d | 972 | done = 0; |
c28bda25 | 973 | } |
1f1b0c74 FT |
974 | if (hostdata->connected) |
975 | break; | |
c28bda25 RZ |
976 | } /* if target/lun/target queue is not busy */ |
977 | } /* for issue_queue */ | |
978 | } /* if (!hostdata->connected) */ | |
979 | ||
980 | if (hostdata->connected | |
1da177e4 | 981 | #ifdef REAL_DMA |
c28bda25 | 982 | && !hostdata->dma_len |
1da177e4 | 983 | #endif |
c28bda25 | 984 | ) { |
d65e634a | 985 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
986 | HOSTNO); |
987 | NCR5380_information_transfer(instance); | |
d65e634a | 988 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
989 | done = 0; |
990 | } | |
991 | } while (!done); | |
11d2f63b | 992 | spin_unlock_irq(&hostdata->lock); |
1da177e4 LT |
993 | } |
994 | ||
995 | ||
996 | #ifdef REAL_DMA | |
997 | /* | |
998 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
999 | * | |
1000 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1001 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1002 | * |
1003 | * Inputs : instance - this instance of the NCR5380. | |
1004 | * | |
1005 | */ | |
1006 | ||
c28bda25 | 1007 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1008 | { |
e8a60144 | 1009 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
01bd9081 | 1010 | int transferred; |
e3f463b0 | 1011 | unsigned char **data; |
c28bda25 | 1012 | volatile int *count; |
e3f463b0 FT |
1013 | int saved_data = 0, overrun = 0; |
1014 | unsigned char p; | |
c28bda25 | 1015 | |
ef1081cb | 1016 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1017 | p = hostdata->connected->SCp.phase; |
1018 | if (p & SR_IO) { | |
1019 | udelay(10); | |
1020 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1021 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1022 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1023 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1024 | overrun = 1; | |
d65e634a | 1025 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1026 | } |
1027 | } | |
1028 | } | |
1029 | ||
e3f463b0 FT |
1030 | #if defined(CONFIG_SUN3) |
1031 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1032 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1033 | instance->host_no); | |
1034 | BUG(); | |
1035 | } | |
1036 | ||
1037 | /* make sure we're not stuck in a data phase */ | |
1038 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1039 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1040 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1041 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1042 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1043 | instance->host_no); | |
1044 | BUG(); | |
1045 | } | |
1046 | #endif | |
1047 | ||
c28bda25 RZ |
1048 | NCR5380_write(MODE_REG, MR_BASE); |
1049 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1050 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1051 | |
01bd9081 | 1052 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1053 | hostdata->dma_len = 0; |
1054 | ||
1055 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1056 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1057 | *data += transferred; |
1058 | *count -= transferred; | |
c28bda25 | 1059 | |
ef1081cb | 1060 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1061 | int cnt, toPIO; |
1062 | ||
c28bda25 | 1063 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1064 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1065 | if (overrun) { |
d65e634a | 1066 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1067 | *(*data)++ = saved_data; |
1068 | (*count)--; | |
1069 | cnt--; | |
1070 | toPIO--; | |
1071 | } | |
d65e634a | 1072 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1073 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1074 | *count -= toPIO - cnt; | |
1075 | } | |
1da177e4 | 1076 | } |
1da177e4 LT |
1077 | } |
1078 | #endif /* REAL_DMA */ | |
1079 | ||
1080 | ||
ff50f9ed FT |
1081 | /** |
1082 | * NCR5380_intr - generic NCR5380 irq handler | |
1083 | * @irq: interrupt number | |
1084 | * @dev_id: device info | |
1da177e4 | 1085 | * |
ff50f9ed FT |
1086 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1087 | * from the disconnected queue, and restarting NCR5380_main() | |
1088 | * as required. | |
cd400825 FT |
1089 | * |
1090 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1091 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1092 | * Three of these six conditions are latched in the Bus and Status Register: | |
1093 | * - End of DMA (cleared by ending DMA Mode) | |
1094 | * - Parity error (cleared by reading RPIR) | |
1095 | * - Loss of BSY (cleared by reading RPIR) | |
1096 | * Two conditions have flag bits that are not latched: | |
1097 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1098 | * - Bus reset (non-maskable) | |
1099 | * The remaining condition has no flag bit at all: | |
1100 | * - Selection/reselection | |
1101 | * | |
1102 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1103 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1104 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1105 | * interrupts will not be lost (they can be on the DP5380)." | |
1106 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1107 | * | |
1108 | * Checking for bus reset by reading RST is futile because of interrupt | |
1109 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1110 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1111 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1112 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1113 | */ |
1114 | ||
c28bda25 | 1115 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1116 | { |
a53a21e4 | 1117 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1118 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1119 | int handled = 0; |
c28bda25 | 1120 | unsigned char basr; |
11d2f63b FT |
1121 | unsigned long flags; |
1122 | ||
1123 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1124 | |
c28bda25 | 1125 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1126 | if (basr & BASR_IRQ) { |
cd400825 FT |
1127 | unsigned char mr = NCR5380_read(MODE_REG); |
1128 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1129 | ||
1130 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1131 | HOSTNO, irq, basr, sr, mr); | |
1da177e4 LT |
1132 | |
1133 | #if defined(REAL_DMA) | |
cd400825 FT |
1134 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1135 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1136 | * We ack IRQ after clearing Mode Register. Workarounds | |
1137 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1138 | */ |
1139 | ||
cd400825 | 1140 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO); |
c28bda25 | 1141 | |
cd400825 FT |
1142 | if (hostdata->connected) { |
1143 | NCR5380_dma_complete(instance); | |
1144 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1145 | } else { | |
1146 | NCR5380_write(MODE_REG, MR_BASE); | |
1147 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1148 | } | |
1149 | } else | |
1da177e4 | 1150 | #endif /* REAL_DMA */ |
cd400825 FT |
1151 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1152 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1153 | /* Probably reselected */ | |
1154 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1155 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1156 | ||
1157 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1158 | HOSTNO); | |
1159 | ||
1160 | if (!hostdata->connected) { | |
1161 | NCR5380_reselect(instance); | |
1162 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1163 | } | |
1164 | if (!hostdata->connected) | |
1165 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1166 | } else { | |
1167 | /* Probably Bus Reset */ | |
1168 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1169 | ||
1170 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO); | |
e3f463b0 | 1171 | #ifdef SUN3_SCSI_VME |
cd400825 | 1172 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1173 | #endif |
cd400825 | 1174 | } |
c28bda25 | 1175 | handled = 1; |
cd400825 FT |
1176 | } else { |
1177 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1178 | #ifdef SUN3_SCSI_VME |
1179 | dregs->csr |= CSR_DMA_ENABLE; | |
1180 | #endif | |
c28bda25 RZ |
1181 | } |
1182 | ||
11d2f63b FT |
1183 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1184 | ||
c28bda25 | 1185 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1186 | } |
1187 | ||
c28bda25 | 1188 | /* |
710ddd0d FT |
1189 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1190 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1191 | * |
1192 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1193 | * including ARBITRATION, SELECTION, and initial message out for |
1194 | * IDENTIFY and queue messages. | |
1da177e4 | 1195 | * |
c28bda25 | 1196 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1197 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1198 | * |
6323876f FT |
1199 | * Returns : -1 if selection failed but should be retried. |
1200 | * 0 if selection failed and should not be retried. | |
1201 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1202 | * |
c28bda25 RZ |
1203 | * Side effects : |
1204 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1205 | * with registers as they should have been on entry - ie |
1206 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1207 | * will cease to drive any SCSI bus signals. | |
1208 | * | |
c28bda25 RZ |
1209 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1210 | * instance->connected will be set to cmd. | |
1211 | * SELECT interrupt will be disabled. | |
1da177e4 | 1212 | * |
c28bda25 | 1213 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1214 | * cmd->result host byte set to DID_BAD_TARGET. |
1215 | */ | |
1216 | ||
710ddd0d | 1217 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1218 | { |
e8a60144 | 1219 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1220 | unsigned char tmp[3], phase; |
1221 | unsigned char *data; | |
1222 | int len; | |
ae753a33 | 1223 | int err; |
c28bda25 | 1224 | |
8ad3a593 | 1225 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1226 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1227 | instance->this_id); |
1228 | ||
1229 | /* | |
1230 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1231 | * data bus during SELECTION. | |
1232 | */ | |
1233 | ||
c28bda25 | 1234 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1235 | |
c28bda25 RZ |
1236 | /* |
1237 | * Start arbitration. | |
1238 | */ | |
1da177e4 | 1239 | |
c28bda25 RZ |
1240 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1241 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1242 | |
55500d9b FT |
1243 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1244 | * Bus Free Delay, arbitration will begin. | |
1245 | */ | |
c28bda25 | 1246 | |
11d2f63b | 1247 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1248 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1249 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1250 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1251 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1252 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1253 | /* Reselection interrupt */ | |
1254 | return -1; | |
1255 | } | |
1256 | if (err < 0) { | |
1257 | NCR5380_write(MODE_REG, MR_BASE); | |
1258 | shost_printk(KERN_ERR, instance, | |
1259 | "select: arbitration timeout\n"); | |
1260 | return -1; | |
c28bda25 | 1261 | } |
11d2f63b | 1262 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1263 | |
55500d9b | 1264 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1265 | udelay(3); |
1266 | ||
1267 | /* Check for lost arbitration */ | |
1268 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1269 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1270 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1271 | NCR5380_write(MODE_REG, MR_BASE); |
d65e634a | 1272 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 | 1273 | HOSTNO); |
11d2f63b | 1274 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1275 | return -1; |
1276 | } | |
1da177e4 | 1277 | |
cf13b083 FT |
1278 | /* After/during arbitration, BSY should be asserted. |
1279 | * IBM DPES-31080 Version S31Q works now | |
1280 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1281 | */ | |
c28bda25 RZ |
1282 | NCR5380_write(INITIATOR_COMMAND_REG, |
1283 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1284 | ||
c28bda25 RZ |
1285 | /* |
1286 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1287 | * a minimum so we'll udelay ceil(1.2) | |
1288 | */ | |
1da177e4 | 1289 | |
9c3f0e2b FT |
1290 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1291 | udelay(15); | |
1292 | else | |
1293 | udelay(2); | |
c28bda25 | 1294 | |
11d2f63b FT |
1295 | spin_lock_irq(&hostdata->lock); |
1296 | ||
72064a78 FT |
1297 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1298 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
c28bda25 | 1299 | return -1; |
c28bda25 | 1300 | |
d65e634a | 1301 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1302 | |
1303 | /* | |
1304 | * Now that we have won arbitration, start Selection process, asserting | |
1305 | * the host and target ID's on the SCSI bus. | |
1306 | */ | |
1307 | ||
1308 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1309 | ||
1310 | /* | |
1311 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1312 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1313 | * phase immediately after selection. | |
1314 | */ | |
1315 | ||
1316 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1317 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1318 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1319 | |
c28bda25 RZ |
1320 | /* |
1321 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1322 | * otherwise we will trigger an interrupt. | |
1323 | */ | |
c28bda25 | 1324 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1325 | |
11d2f63b FT |
1326 | spin_unlock_irq(&hostdata->lock); |
1327 | ||
c28bda25 RZ |
1328 | /* |
1329 | * The initiator shall then wait at least two deskew delays and release | |
1330 | * the BSY signal. | |
1331 | */ | |
1332 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1333 | ||
1334 | /* Reset BSY */ | |
1335 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1336 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1337 | ||
1338 | /* | |
1339 | * Something weird happens when we cease to drive BSY - looks | |
1340 | * like the board/chip is letting us do another read before the | |
1341 | * appropriate propagation delay has expired, and we're confusing | |
1342 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1343 | * | |
1344 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1345 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1346 | * tighter 'C' code breaks and requires this) solves the problem - | |
1347 | * the 1 us delay is arbitrary, and only used because this delay will | |
1348 | * be the same on other platforms and since it works here, it should | |
1349 | * work there. | |
1350 | * | |
1351 | * wingel suggests that this could be due to failing to wait | |
1352 | * one deskew delay. | |
1353 | */ | |
1da177e4 | 1354 | |
c28bda25 | 1355 | udelay(1); |
1da177e4 | 1356 | |
d65e634a | 1357 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1358 | |
c28bda25 RZ |
1359 | /* |
1360 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1361 | * selection. | |
1362 | */ | |
1da177e4 | 1363 | |
ae753a33 FT |
1364 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1365 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1366 | |
1367 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1368 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1369 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1370 | NCR5380_reselect(instance); | |
cd400825 FT |
1371 | if (!hostdata->connected) |
1372 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
c28bda25 RZ |
1373 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
1374 | HOSTNO); | |
c28bda25 RZ |
1375 | return -1; |
1376 | } | |
1da177e4 | 1377 | |
ae753a33 | 1378 | if (err < 0) { |
11d2f63b | 1379 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1380 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1381 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1382 | #ifdef SUPPORT_TAGS |
c28bda25 | 1383 | cmd_free_tag(cmd); |
1da177e4 | 1384 | #endif |
c28bda25 RZ |
1385 | cmd->scsi_done(cmd); |
1386 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1387 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1388 | return 0; |
1389 | } | |
1390 | ||
ae753a33 FT |
1391 | /* |
1392 | * No less than two deskew delays after the initiator detects the | |
1393 | * BSY signal is true, it shall release the SEL signal and may | |
1394 | * change the DATA BUS. -wingel | |
1395 | */ | |
1396 | ||
1397 | udelay(1); | |
1398 | ||
1399 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1400 | ||
c28bda25 RZ |
1401 | /* |
1402 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1403 | * was true but before BSY was false during selection, the information | |
1404 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1405 | * IDENTIFY message. | |
1406 | * | |
1407 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1408 | * message (2 bytes) with a tag ID that we increment with every command | |
1409 | * until it wraps back to 0. | |
1410 | * | |
1411 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1412 | * which claim to support tagged queuing but fail when more than | |
1413 | * some number of commands are issued at once. | |
1414 | */ | |
1415 | ||
1416 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1417 | |
1418 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1419 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1420 | if (err < 0) { |
1421 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1422 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1423 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1424 | return -1; | |
1425 | } | |
c28bda25 | 1426 | |
d65e634a | 1427 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1428 | HOSTNO, cmd->device->id); |
1429 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1430 | |
1431 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1432 | if (cmd->tag != TAG_NONE) { |
1433 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1434 | tmp[2] = cmd->tag; | |
1435 | len = 3; | |
1436 | } else | |
1437 | len = 1; | |
1da177e4 | 1438 | #else |
c28bda25 RZ |
1439 | len = 1; |
1440 | cmd->tag = 0; | |
1da177e4 LT |
1441 | #endif /* SUPPORT_TAGS */ |
1442 | ||
c28bda25 RZ |
1443 | /* Send message(s) */ |
1444 | data = tmp; | |
1445 | phase = PHASE_MSGOUT; | |
1446 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1447 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 | 1448 | /* XXX need to handle errors here */ |
11d2f63b | 1449 | |
c28bda25 | 1450 | hostdata->connected = cmd; |
1da177e4 | 1451 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1452 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1453 | #endif | |
e3f463b0 FT |
1454 | #ifdef SUN3_SCSI_VME |
1455 | dregs->csr |= CSR_INTR; | |
1456 | #endif | |
1da177e4 | 1457 | |
c28bda25 | 1458 | initialize_SCp(cmd); |
1da177e4 | 1459 | |
c28bda25 | 1460 | return 0; |
1da177e4 LT |
1461 | } |
1462 | ||
c28bda25 RZ |
1463 | /* |
1464 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1465 | * unsigned char *phase, int *count, unsigned char **data) |
1466 | * | |
1467 | * Purpose : transfers data in given phase using polled I/O | |
1468 | * | |
c28bda25 RZ |
1469 | * Inputs : instance - instance of driver, *phase - pointer to |
1470 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1471 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1472 | * |
1da177e4 | 1473 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1474 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1475 | * is in same phase. |
1476 | * | |
c28bda25 | 1477 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1478 | * |
1479 | * XXX Note : handling for bus free may be useful. | |
1480 | */ | |
1481 | ||
1482 | /* | |
c28bda25 | 1483 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1484 | * IS 100% reliable, and for the actual data transfer where speed |
1485 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1486 | */ | |
1487 | ||
c28bda25 RZ |
1488 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1489 | unsigned char *phase, int *count, | |
1490 | unsigned char **data) | |
1da177e4 | 1491 | { |
c28bda25 RZ |
1492 | register unsigned char p = *phase, tmp; |
1493 | register int c = *count; | |
1494 | register unsigned char *d = *data; | |
1495 | ||
1496 | /* | |
1497 | * The NCR5380 chip will only drive the SCSI bus when the | |
1498 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1499 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1500 | */ |
1da177e4 | 1501 | |
c28bda25 | 1502 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1503 | |
c28bda25 RZ |
1504 | do { |
1505 | /* | |
1506 | * Wait for assertion of REQ, after which the phase bits will be | |
1507 | * valid | |
1508 | */ | |
686f3990 FT |
1509 | |
1510 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1511 | break; | |
1da177e4 | 1512 | |
d65e634a | 1513 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1514 | |
c28bda25 | 1515 | /* Check for phase mismatch */ |
686f3990 | 1516 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1517 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1518 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1519 | break; |
1520 | } | |
1da177e4 | 1521 | |
c28bda25 RZ |
1522 | /* Do actual transfer from SCSI bus to / from memory */ |
1523 | if (!(p & SR_IO)) | |
1524 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1525 | else | |
1526 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1527 | |
c28bda25 | 1528 | ++d; |
1da177e4 | 1529 | |
c28bda25 RZ |
1530 | /* |
1531 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1532 | * should drop ATN on the last byte of the message phase | |
1533 | * after REQ has been asserted for the handshake but before | |
1534 | * the initiator raises ACK. | |
1535 | */ | |
1da177e4 | 1536 | |
c28bda25 RZ |
1537 | if (!(p & SR_IO)) { |
1538 | if (!((p & SR_MSG) && c > 1)) { | |
1539 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1540 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1541 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1542 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1543 | } else { | |
1544 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1545 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1546 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1547 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1548 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1549 | } | |
1550 | } else { | |
8ad3a593 | 1551 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1552 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1553 | } | |
1da177e4 | 1554 | |
a2edc4a6 FT |
1555 | if (NCR5380_poll_politely(instance, |
1556 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1557 | break; | |
c28bda25 | 1558 | |
d65e634a | 1559 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1560 | |
1561 | /* | |
1562 | * We have several special cases to consider during REQ/ACK handshaking : | |
1563 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1564 | * message. ATN must be dropped as ACK is dropped. | |
1565 | * | |
1566 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1567 | * message. We must exit with ACK asserted, so that the calling | |
1568 | * code may raise ATN before dropping ACK to reject the message. | |
1569 | * | |
1570 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1571 | */ | |
1572 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1573 | if (p == PHASE_MSGOUT && c > 1) | |
1574 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1575 | else | |
1576 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1577 | } | |
1578 | } while (--c); | |
1579 | ||
d65e634a | 1580 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1581 | |
1582 | *count = c; | |
1583 | *data = d; | |
1584 | tmp = NCR5380_read(STATUS_REG); | |
1585 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1586 | * asserted or if ACK hasn't been released yet. The latter applies if |
1587 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1588 | */ |
a2edc4a6 | 1589 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1590 | *phase = tmp & PHASE_MASK; |
1591 | else | |
1592 | *phase = PHASE_UNKNOWN; | |
1593 | ||
1594 | if (!c || (*phase == p)) | |
1595 | return 0; | |
1596 | else | |
1597 | return -1; | |
1da177e4 LT |
1598 | } |
1599 | ||
636b1ec8 FT |
1600 | /** |
1601 | * do_reset - issue a reset command | |
1602 | * @instance: adapter to reset | |
1603 | * | |
1604 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1605 | * back into sane shape. | |
1606 | * | |
1607 | * This clears the reset interrupt flag because there may be no handler for | |
1608 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1609 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1610 | */ | |
1611 | ||
1612 | static void do_reset(struct Scsi_Host *instance) | |
1613 | { | |
1614 | unsigned long flags; | |
1615 | ||
1616 | local_irq_save(flags); | |
1617 | NCR5380_write(TARGET_COMMAND_REG, | |
1618 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1619 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1620 | udelay(50); | |
1621 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1622 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1623 | local_irq_restore(flags); | |
1624 | } | |
1625 | ||
80d3eb6d FT |
1626 | /** |
1627 | * do_abort - abort the currently established nexus by going to | |
1628 | * MESSAGE OUT phase and sending an ABORT message. | |
1629 | * @instance: relevant scsi host instance | |
c28bda25 | 1630 | * |
80d3eb6d | 1631 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1632 | */ |
1633 | ||
a53a21e4 | 1634 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1635 | { |
c28bda25 RZ |
1636 | unsigned char tmp, *msgptr, phase; |
1637 | int len; | |
80d3eb6d | 1638 | int rc; |
c28bda25 RZ |
1639 | |
1640 | /* Request message out phase */ | |
1da177e4 | 1641 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1642 | |
1643 | /* | |
1644 | * Wait for the target to indicate a valid phase by asserting | |
1645 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1646 | * and can immediately send the ABORT message, or we'll have some | |
1647 | * other phase and will have to source/sink data. | |
1648 | * | |
1649 | * We really don't care what value was on the bus or what value | |
1650 | * the target sees, so we just handshake. | |
1651 | */ | |
1652 | ||
80d3eb6d FT |
1653 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1654 | if (rc < 0) | |
1655 | goto timeout; | |
1656 | ||
1657 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1658 | |
1659 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1660 | ||
80d3eb6d FT |
1661 | if (tmp != PHASE_MSGOUT) { |
1662 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1663 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1664 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1665 | if (rc < 0) | |
1666 | goto timeout; | |
c28bda25 RZ |
1667 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1668 | } | |
1669 | ||
1670 | tmp = ABORT; | |
1671 | msgptr = &tmp; | |
1672 | len = 1; | |
1673 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1674 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1675 | |
1676 | /* | |
1677 | * If we got here, and the command completed successfully, | |
1678 | * we're about to go into bus free state. | |
1679 | */ | |
1680 | ||
1681 | return len ? -1 : 0; | |
80d3eb6d FT |
1682 | |
1683 | timeout: | |
1684 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1685 | return -1; | |
1da177e4 LT |
1686 | } |
1687 | ||
1688 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1689 | /* |
1690 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1691 | * unsigned char *phase, int *count, unsigned char **data) |
1692 | * | |
1693 | * Purpose : transfers data in given phase using either real | |
1694 | * or pseudo DMA. | |
1695 | * | |
c28bda25 RZ |
1696 | * Inputs : instance - instance of driver, *phase - pointer to |
1697 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1698 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1699 | * |
1da177e4 | 1700 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1701 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1702 | * is in same phase. |
1703 | * | |
c28bda25 | 1704 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1705 | * |
1706 | */ | |
1707 | ||
1708 | ||
c28bda25 RZ |
1709 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1710 | unsigned char *phase, int *count, | |
1711 | unsigned char **data) | |
1da177e4 | 1712 | { |
e8a60144 | 1713 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1714 | register int c = *count; |
1715 | register unsigned char p = *phase; | |
e3f463b0 FT |
1716 | |
1717 | #if defined(CONFIG_SUN3) | |
1718 | /* sanity check */ | |
1719 | if (!sun3_dma_setup_done) { | |
1720 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1721 | instance->host_no); | |
1722 | BUG(); | |
1723 | } | |
1724 | hostdata->dma_len = c; | |
1725 | ||
1726 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1727 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1728 | c, (p & SR_IO) ? "to" : "from", *data); | |
1729 | ||
1730 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1731 | |
1732 | /* send start chain */ | |
1733 | sun3scsi_dma_start(c, *data); | |
1734 | ||
cd400825 FT |
1735 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1736 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1737 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1738 | if (p & SR_IO) { |
e3f463b0 | 1739 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1740 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1741 | } else { | |
e3f463b0 | 1742 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1743 | NCR5380_write(START_DMA_SEND_REG, 0); |
1744 | } | |
1745 | ||
1746 | #ifdef SUN3_SCSI_VME | |
1747 | dregs->csr |= CSR_DMA_ENABLE; | |
1748 | #endif | |
1749 | ||
e3f463b0 FT |
1750 | sun3_dma_active = 1; |
1751 | ||
1752 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1753 | register unsigned char *d = *data; |
1754 | unsigned char tmp; | |
c28bda25 RZ |
1755 | |
1756 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1757 | *phase = tmp; | |
1758 | return -1; | |
1759 | } | |
1da177e4 | 1760 | |
ef1081cb FT |
1761 | if (hostdata->read_overruns && (p & SR_IO)) |
1762 | c -= hostdata->read_overruns; | |
1da177e4 | 1763 | |
d65e634a | 1764 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1765 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1766 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1767 | |
c28bda25 | 1768 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1769 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1770 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1771 | |
ef1081cb | 1772 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1773 | /* On the Medusa, it is a must to initialize the DMA before |
1774 | * starting the NCR. This is also the cleaner way for the TT. | |
1775 | */ | |
c28bda25 RZ |
1776 | hostdata->dma_len = (p & SR_IO) ? |
1777 | NCR5380_dma_read_setup(instance, d, c) : | |
1778 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1779 | } |
1780 | ||
1781 | if (p & SR_IO) | |
1782 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1783 | else { | |
1784 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1785 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1786 | } | |
1787 | ||
ef1081cb | 1788 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1789 | /* On the Falcon, the DMA setup must be done after the last */ |
1790 | /* NCR access, else the DMA setup gets trashed! | |
1791 | */ | |
c28bda25 RZ |
1792 | hostdata->dma_len = (p & SR_IO) ? |
1793 | NCR5380_dma_read_setup(instance, d, c) : | |
1794 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1795 | } |
e3f463b0 FT |
1796 | #endif /* !defined(CONFIG_SUN3) */ |
1797 | ||
c28bda25 | 1798 | return 0; |
1da177e4 LT |
1799 | } |
1800 | #endif /* defined(REAL_DMA) */ | |
1801 | ||
1802 | /* | |
1803 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1804 | * | |
c28bda25 RZ |
1805 | * Purpose : run through the various SCSI phases and do as the target |
1806 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1807 | * instance->connected. |
1808 | * | |
1809 | * Inputs : instance, instance for which we are doing commands | |
1810 | * | |
c28bda25 | 1811 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1812 | * modified if a command disconnects, *instance->connected will |
1813 | * change. | |
1814 | * | |
c28bda25 RZ |
1815 | * XXX Note : we need to watch for bus free or a reset condition here |
1816 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1817 | */ |
c28bda25 RZ |
1818 | |
1819 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1820 | { |
e8a60144 | 1821 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1822 | unsigned char msgout = NOP; |
1823 | int sink = 0; | |
1824 | int len; | |
1da177e4 | 1825 | #if defined(REAL_DMA) |
c28bda25 | 1826 | int transfersize; |
1da177e4 | 1827 | #endif |
c28bda25 RZ |
1828 | unsigned char *data; |
1829 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1830 | struct scsi_cmnd *cmd; |
c28bda25 | 1831 | |
e3f463b0 FT |
1832 | #ifdef SUN3_SCSI_VME |
1833 | dregs->csr |= CSR_INTR; | |
1834 | #endif | |
1835 | ||
11d2f63b | 1836 | while ((cmd = hostdata->connected)) { |
c28bda25 RZ |
1837 | tmp = NCR5380_read(STATUS_REG); |
1838 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1839 | if (tmp & SR_REQ) { | |
1840 | phase = (tmp & PHASE_MASK); | |
1841 | if (phase != old_phase) { | |
1842 | old_phase = phase; | |
8ad3a593 | 1843 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1844 | } |
e3f463b0 FT |
1845 | #if defined(CONFIG_SUN3) |
1846 | if (phase == PHASE_CMDOUT) { | |
1847 | #if defined(REAL_DMA) | |
1848 | void *d; | |
1849 | unsigned long count; | |
1850 | ||
1851 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1852 | count = cmd->SCp.buffer->length; | |
1853 | d = sg_virt(cmd->SCp.buffer); | |
1854 | } else { | |
1855 | count = cmd->SCp.this_residual; | |
1856 | d = cmd->SCp.ptr; | |
1857 | } | |
1858 | /* this command setup for dma yet? */ | |
1859 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1860 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
1861 | sun3scsi_dma_setup(d, count, | |
1862 | rq_data_dir(cmd->request)); | |
1863 | sun3_dma_setup_done = cmd; | |
1864 | } | |
1865 | } | |
1866 | #endif | |
1867 | #ifdef SUN3_SCSI_VME | |
1868 | dregs->csr |= CSR_INTR; | |
1869 | #endif | |
1870 | } | |
1871 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1872 | |
c28bda25 RZ |
1873 | if (sink && (phase != PHASE_MSGOUT)) { |
1874 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1875 | ||
1876 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1877 | ICR_ASSERT_ACK); | |
1878 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1879 | ; | |
1880 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1881 | ICR_ASSERT_ATN); | |
1882 | sink = 0; | |
1883 | continue; | |
1884 | } | |
1885 | ||
1886 | switch (phase) { | |
1887 | case PHASE_DATAOUT: | |
1da177e4 | 1888 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
1889 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
1890 | "aborted\n", HOSTNO); | |
1891 | sink = 1; | |
1892 | do_abort(instance); | |
1893 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1894 | cmd->scsi_done(cmd); |
c28bda25 | 1895 | return; |
1da177e4 | 1896 | #endif |
c28bda25 RZ |
1897 | case PHASE_DATAIN: |
1898 | /* | |
1899 | * If there is no room left in the current buffer in the | |
1900 | * scatter-gather list, move onto the next one. | |
1901 | */ | |
1902 | ||
1903 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1904 | ++cmd->SCp.buffer; | |
1905 | --cmd->SCp.buffers_residual; | |
1906 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1907 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1908 | /* ++roman: Try to merge some scatter-buffers if |
1909 | * they are at contiguous physical addresses. | |
1910 | */ | |
1911 | merge_contiguous_buffers(cmd); | |
d65e634a | 1912 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
1913 | HOSTNO, cmd->SCp.this_residual, |
1914 | cmd->SCp.buffers_residual); | |
1915 | } | |
1916 | ||
1917 | /* | |
1918 | * The preferred transfer method is going to be | |
1919 | * PSEUDO-DMA for systems that are strictly PIO, | |
1920 | * since we can let the hardware do the handshaking. | |
1921 | * | |
1922 | * For this to work, we need to know the transfersize | |
1923 | * ahead of time, since the pseudo-DMA code will sit | |
1924 | * in an unconditional loop. | |
1925 | */ | |
1926 | ||
1927 | /* ++roman: I suggest, this should be | |
1928 | * #if def(REAL_DMA) | |
1929 | * instead of leaving REAL_DMA out. | |
1930 | */ | |
1da177e4 LT |
1931 | |
1932 | #if defined(REAL_DMA) | |
e3f463b0 | 1933 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1934 | transfersize = 0; |
1935 | if (!cmd->device->borken) | |
e3f463b0 | 1936 | #endif |
ff3d4578 FT |
1937 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1938 | ||
1939 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
1940 | len = transfersize; |
1941 | cmd->SCp.phase = phase; | |
1942 | if (NCR5380_transfer_dma(instance, &phase, | |
1943 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1944 | /* | |
1945 | * If the watchdog timer fires, all future | |
1946 | * accesses to this device will use the | |
1947 | * polled-IO. */ | |
ff50f9ed FT |
1948 | scmd_printk(KERN_INFO, cmd, |
1949 | "switching to slow handshake\n"); | |
c28bda25 | 1950 | cmd->device->borken = 1; |
c28bda25 RZ |
1951 | sink = 1; |
1952 | do_abort(instance); | |
1953 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1954 | cmd->scsi_done(cmd); |
c28bda25 RZ |
1955 | /* XXX - need to source or sink data here, as appropriate */ |
1956 | } else { | |
1da177e4 | 1957 | #ifdef REAL_DMA |
c28bda25 RZ |
1958 | /* ++roman: When using real DMA, |
1959 | * information_transfer() should return after | |
1960 | * starting DMA since it has nothing more to | |
1961 | * do. | |
1962 | */ | |
1963 | return; | |
1964 | #else | |
1965 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 1966 | #endif |
c28bda25 RZ |
1967 | } |
1968 | } else | |
1da177e4 | 1969 | #endif /* defined(REAL_DMA) */ |
11d2f63b FT |
1970 | { |
1971 | spin_unlock_irq(&hostdata->lock); | |
c28bda25 RZ |
1972 | NCR5380_transfer_pio(instance, &phase, |
1973 | (int *)&cmd->SCp.this_residual, | |
1974 | (unsigned char **)&cmd->SCp.ptr); | |
11d2f63b FT |
1975 | spin_lock_irq(&hostdata->lock); |
1976 | } | |
e3f463b0 FT |
1977 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
1978 | /* if we had intended to dma that command clear it */ | |
1979 | if (sun3_dma_setup_done == cmd) | |
1980 | sun3_dma_setup_done = NULL; | |
1981 | #endif | |
c28bda25 RZ |
1982 | break; |
1983 | case PHASE_MSGIN: | |
1984 | len = 1; | |
1985 | data = &tmp; | |
c28bda25 RZ |
1986 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
1987 | cmd->SCp.Message = tmp; | |
1988 | ||
1989 | switch (tmp) { | |
c28bda25 RZ |
1990 | case ABORT: |
1991 | case COMMAND_COMPLETE: | |
1992 | /* Accept message by clearing ACK */ | |
1993 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
0d3d9a42 FT |
1994 | dsprintk(NDEBUG_QUEUES, instance, |
1995 | "COMMAND COMPLETE %p target %d lun %llu\n", | |
1996 | cmd, scmd_id(cmd), cmd->device->lun); | |
e3c3da67 | 1997 | |
e3c3da67 | 1998 | hostdata->connected = NULL; |
1da177e4 | 1999 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2000 | cmd_free_tag(cmd); |
2001 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
61d739a4 | 2002 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 2003 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2004 | "QUEUE_FULL after %d commands\n", |
2005 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2006 | ta->nr_allocated); | |
2007 | if (ta->queue_size > ta->nr_allocated) | |
e42d0151 | 2008 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2009 | } |
1da177e4 | 2010 | #else |
c28bda25 | 2011 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2012 | #endif |
c28bda25 RZ |
2013 | |
2014 | /* | |
2015 | * I'm not sure what the correct thing to do here is : | |
2016 | * | |
2017 | * If the command that just executed is NOT a request | |
2018 | * sense, the obvious thing to do is to set the result | |
2019 | * code to the values of the stored parameters. | |
2020 | * | |
2021 | * If it was a REQUEST SENSE command, we need some way to | |
2022 | * differentiate between the failure code of the original | |
2023 | * and the failure code of the REQUEST sense - the obvious | |
2024 | * case is success, where we fall through and leave the | |
2025 | * result code unchanged. | |
2026 | * | |
2027 | * The non-obvious place is where the REQUEST SENSE failed | |
2028 | */ | |
2029 | ||
2030 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2031 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2032 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2033 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2034 | |
28424d3a BH |
2035 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2036 | hostdata->ses.cmd_len) { | |
2037 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2038 | hostdata->ses.cmd_len = 0 ; | |
2039 | } | |
2040 | ||
c28bda25 RZ |
2041 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2042 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2043 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2044 | ||
3130d905 | 2045 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2046 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
0d3d9a42 FT |
2047 | dsprintk(NDEBUG_AUTOSENSE | NDEBUG_QUEUES, |
2048 | instance, "REQUEST SENSE cmd %p added to head of issue queue\n", | |
dbb6b350 | 2049 | cmd); |
997acab7 | 2050 | } else { |
c28bda25 RZ |
2051 | cmd->scsi_done(cmd); |
2052 | } | |
2053 | ||
c28bda25 RZ |
2054 | /* |
2055 | * Restore phase bits to 0 so an interrupted selection, | |
2056 | * arbitration can resume. | |
2057 | */ | |
2058 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2059 | ||
72064a78 FT |
2060 | /* Enable reselect interrupts */ |
2061 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2062 | ||
c28bda25 RZ |
2063 | /* ++roman: For Falcon SCSI, release the lock on the |
2064 | * ST-DMA here if no other commands are waiting on the | |
2065 | * disconnected queue. | |
2066 | */ | |
e3c3da67 | 2067 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2068 | return; |
2069 | case MESSAGE_REJECT: | |
2070 | /* Accept message by clearing ACK */ | |
2071 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2072 | switch (hostdata->last_message) { |
2073 | case HEAD_OF_QUEUE_TAG: | |
2074 | case ORDERED_QUEUE_TAG: | |
2075 | case SIMPLE_QUEUE_TAG: | |
2076 | /* The target obviously doesn't support tagged | |
2077 | * queuing, even though it announced this ability in | |
2078 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2079 | * clear 'tagged_supported' and lock the LUN, since | |
2080 | * the command is treated as untagged further on. | |
2081 | */ | |
2082 | cmd->device->tagged_supported = 0; | |
2083 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2084 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2085 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2086 | "QUEUE_TAG message; tagged queuing " |
2087 | "disabled\n", | |
2088 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2089 | break; | |
2090 | } | |
2091 | break; | |
2092 | case DISCONNECT: | |
2093 | /* Accept message by clearing ACK */ | |
2094 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
3130d905 | 2095 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2096 | hostdata->connected = NULL; |
2097 | hostdata->disconnected_queue = cmd; | |
0d3d9a42 FT |
2098 | dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, |
2099 | instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", | |
2100 | cmd, scmd_id(cmd), cmd->device->lun); | |
2101 | ||
c28bda25 RZ |
2102 | /* |
2103 | * Restore phase bits to 0 so an interrupted selection, | |
2104 | * arbitration can resume. | |
2105 | */ | |
2106 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2107 | ||
2108 | /* Enable reselect interrupts */ | |
2109 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2110 | #ifdef SUN3_SCSI_VME |
2111 | dregs->csr |= CSR_DMA_ENABLE; | |
2112 | #endif | |
c28bda25 RZ |
2113 | return; |
2114 | /* | |
2115 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2116 | * operation, in violation of the SCSI spec so we can safely | |
2117 | * ignore SAVE/RESTORE pointers calls. | |
2118 | * | |
2119 | * Unfortunately, some disks violate the SCSI spec and | |
2120 | * don't issue the required SAVE_POINTERS message before | |
2121 | * disconnecting, and we have to break spec to remain | |
2122 | * compatible. | |
2123 | */ | |
2124 | case SAVE_POINTERS: | |
2125 | case RESTORE_POINTERS: | |
2126 | /* Accept message by clearing ACK */ | |
2127 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2128 | break; |
2129 | case EXTENDED_MESSAGE: | |
2130 | /* | |
2131 | * Extended messages are sent in the following format : | |
2132 | * Byte | |
2133 | * 0 EXTENDED_MESSAGE == 1 | |
2134 | * 1 length (includes one byte for code, doesn't | |
2135 | * include first two bytes) | |
2136 | * 2 code | |
2137 | * 3..length+1 arguments | |
2138 | * | |
2139 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2140 | * byte, since spi_print_msg() wants the whole thing. | |
2141 | */ | |
2142 | extended_msg[0] = EXTENDED_MESSAGE; | |
2143 | /* Accept first byte by clearing ACK */ | |
2144 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2145 | ||
11d2f63b FT |
2146 | spin_unlock_irq(&hostdata->lock); |
2147 | ||
d65e634a | 2148 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2149 | |
2150 | len = 2; | |
2151 | data = extended_msg + 1; | |
2152 | phase = PHASE_MSGIN; | |
2153 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2154 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2155 | (int)extended_msg[1], (int)extended_msg[2]); |
2156 | ||
e0783ed3 FT |
2157 | if (!len && extended_msg[1] > 0 && |
2158 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2159 | /* Accept third byte by clearing ACK */ |
2160 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2161 | len = extended_msg[1] - 1; | |
2162 | data = extended_msg + 3; | |
2163 | phase = PHASE_MSGIN; | |
2164 | ||
2165 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2166 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2167 | HOSTNO, len); |
2168 | ||
2169 | switch (extended_msg[2]) { | |
2170 | case EXTENDED_SDTR: | |
2171 | case EXTENDED_WDTR: | |
2172 | case EXTENDED_MODIFY_DATA_POINTER: | |
2173 | case EXTENDED_EXTENDED_IDENTIFY: | |
2174 | tmp = 0; | |
2175 | } | |
2176 | } else if (len) { | |
2177 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2178 | "extended message\n", HOSTNO); | |
2179 | tmp = 0; | |
2180 | } else { | |
2181 | printk(KERN_NOTICE "scsi%d: extended message " | |
2182 | "code %02x length %d is too long\n", | |
2183 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2184 | tmp = 0; | |
2185 | } | |
11d2f63b FT |
2186 | |
2187 | spin_lock_irq(&hostdata->lock); | |
2188 | if (!hostdata->connected) | |
2189 | return; | |
2190 | ||
c28bda25 RZ |
2191 | /* Fall through to reject message */ |
2192 | ||
2193 | /* | |
2194 | * If we get something weird that we aren't expecting, | |
2195 | * reject it. | |
2196 | */ | |
2197 | default: | |
2198 | if (!tmp) { | |
ff50f9ed FT |
2199 | printk(KERN_INFO "scsi%d: rejecting message ", |
2200 | instance->host_no); | |
c28bda25 RZ |
2201 | spi_print_msg(extended_msg); |
2202 | printk("\n"); | |
2203 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2204 | scmd_printk(KERN_INFO, cmd, |
2205 | "rejecting unknown message %02x\n", | |
2206 | tmp); | |
c28bda25 | 2207 | else |
ff50f9ed FT |
2208 | scmd_printk(KERN_INFO, cmd, |
2209 | "rejecting unknown extended message code %02x, length %d\n", | |
2210 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2211 | |
2212 | msgout = MESSAGE_REJECT; | |
2213 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2214 | break; | |
2215 | } /* switch (tmp) */ | |
2216 | break; | |
2217 | case PHASE_MSGOUT: | |
2218 | len = 1; | |
2219 | data = &msgout; | |
2220 | hostdata->last_message = msgout; | |
2221 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2222 | if (msgout == ABORT) { | |
1da177e4 | 2223 | #ifdef SUPPORT_TAGS |
c28bda25 | 2224 | cmd_free_tag(cmd); |
1da177e4 | 2225 | #else |
c28bda25 | 2226 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2227 | #endif |
c28bda25 RZ |
2228 | hostdata->connected = NULL; |
2229 | cmd->result = DID_ERROR << 16; | |
e3c3da67 | 2230 | maybe_release_dma_irq(instance); |
e3c3da67 | 2231 | cmd->scsi_done(cmd); |
cd400825 | 2232 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2233 | return; |
2234 | } | |
2235 | msgout = NOP; | |
2236 | break; | |
2237 | case PHASE_CMDOUT: | |
2238 | len = cmd->cmd_len; | |
2239 | data = cmd->cmnd; | |
2240 | /* | |
2241 | * XXX for performance reasons, on machines with a | |
2242 | * PSEUDO-DMA architecture we should probably | |
2243 | * use the dma transfer function. | |
2244 | */ | |
2245 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2246 | break; | |
2247 | case PHASE_STATIN: | |
2248 | len = 1; | |
2249 | data = &tmp; | |
2250 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2251 | cmd->SCp.Status = tmp; | |
2252 | break; | |
2253 | default: | |
2254 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2255 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2256 | } /* switch(phase) */ |
686f3990 | 2257 | } else { |
11d2f63b | 2258 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2259 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2260 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2261 | } |
11d2f63b | 2262 | } |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | /* | |
2266 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2267 | * | |
c28bda25 | 2268 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2269 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2270 | * nexus has been reestablished, |
c28bda25 | 2271 | * |
1da177e4 LT |
2272 | * Inputs : instance - this instance of the NCR5380. |
2273 | * | |
2274 | */ | |
2275 | ||
2276 | ||
e3f463b0 FT |
2277 | /* it might eventually prove necessary to do a dma setup on |
2278 | reselection, but it doesn't seem to be needed now -- sam */ | |
2279 | ||
c28bda25 | 2280 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2281 | { |
e8a60144 | 2282 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2283 | unsigned char target_mask; |
e3f463b0 | 2284 | unsigned char lun; |
1da177e4 | 2285 | #ifdef SUPPORT_TAGS |
c28bda25 | 2286 | unsigned char tag; |
1da177e4 | 2287 | #endif |
c28bda25 | 2288 | unsigned char msg[3]; |
e3f463b0 FT |
2289 | int __maybe_unused len; |
2290 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2291 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2292 | |
2293 | /* | |
2294 | * Disable arbitration, etc. since the host adapter obviously | |
2295 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2296 | */ | |
2297 | ||
2298 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2299 | |
2300 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2301 | ||
d65e634a | 2302 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2303 | |
2304 | /* | |
2305 | * At this point, we have detected that our SCSI ID is on the bus, | |
2306 | * SEL is true and BSY was false for at least one bus settle delay | |
2307 | * (400 ns). | |
2308 | * | |
2309 | * We must assert BSY ourselves, until the target drops the SEL | |
2310 | * signal. | |
2311 | */ | |
2312 | ||
2313 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2314 | if (NCR5380_poll_politely(instance, |
2315 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2316 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2317 | return; | |
2318 | } | |
c28bda25 RZ |
2319 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2320 | ||
2321 | /* | |
2322 | * Wait for target to go into MSGIN. | |
2323 | */ | |
2324 | ||
72064a78 FT |
2325 | if (NCR5380_poll_politely(instance, |
2326 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2327 | do_abort(instance); | |
2328 | return; | |
2329 | } | |
c28bda25 | 2330 | |
e3f463b0 FT |
2331 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2332 | /* acknowledge toggle to MSGIN */ | |
2333 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2334 | ||
2335 | /* peek at the byte without really hitting the bus */ | |
2336 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2337 | #else | |
c28bda25 RZ |
2338 | len = 1; |
2339 | data = msg; | |
2340 | phase = PHASE_MSGIN; | |
2341 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2342 | |
2343 | if (len) { | |
2344 | do_abort(instance); | |
2345 | return; | |
2346 | } | |
e3f463b0 | 2347 | #endif |
c28bda25 RZ |
2348 | |
2349 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2350 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2351 | spi_print_msg(msg); |
72064a78 | 2352 | printk("\n"); |
c28bda25 RZ |
2353 | do_abort(instance); |
2354 | return; | |
2355 | } | |
72064a78 | 2356 | lun = msg[0] & 0x07; |
1da177e4 | 2357 | |
e3f463b0 | 2358 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2359 | /* If the phase is still MSGIN, the target wants to send some more |
2360 | * messages. In case it supports tagged queuing, this is probably a | |
2361 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2362 | */ | |
2363 | tag = TAG_NONE; | |
ca513fc9 | 2364 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2365 | /* Accept previous IDENTIFY message by clearing ACK */ |
2366 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2367 | len = 2; | |
2368 | data = msg + 1; | |
2369 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2370 | msg[1] == SIMPLE_QUEUE_TAG) | |
2371 | tag = msg[2]; | |
d65e634a | 2372 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2373 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2374 | } | |
1da177e4 | 2375 | #endif |
c28bda25 RZ |
2376 | |
2377 | /* | |
2378 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2379 | * just reestablished, and remove it from the disconnected queue. | |
2380 | */ | |
2381 | ||
710ddd0d | 2382 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 | 2383 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
72064a78 | 2384 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 | 2385 | #ifdef SUPPORT_TAGS |
c28bda25 | 2386 | && (tag == tmp->tag) |
1da177e4 | 2387 | #endif |
c28bda25 | 2388 | ) { |
c28bda25 | 2389 | if (prev) { |
3130d905 | 2390 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 | 2391 | } else { |
c28bda25 RZ |
2392 | hostdata->disconnected_queue = NEXT(tmp); |
2393 | } | |
3130d905 | 2394 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2395 | break; |
2396 | } | |
1da177e4 | 2397 | } |
c28bda25 | 2398 | |
0d3d9a42 FT |
2399 | if (tmp) { |
2400 | dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, | |
2401 | "reselect: removed %p from disconnected queue\n", tmp); | |
2402 | } else { | |
2403 | ||
1da177e4 | 2404 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2405 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2406 | target_mask, lun, tag); | |
2407 | #else | |
2408 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2409 | target_mask, lun); | |
1da177e4 | 2410 | #endif |
c28bda25 RZ |
2411 | /* |
2412 | * Since we have an established nexus that we can't do anything | |
2413 | * with, we must abort it. | |
2414 | */ | |
2415 | do_abort(instance); | |
2416 | return; | |
2417 | } | |
1da177e4 | 2418 | |
e3f463b0 FT |
2419 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2420 | /* engage dma setup for the command we just saw */ | |
2421 | { | |
2422 | void *d; | |
2423 | unsigned long count; | |
2424 | ||
2425 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2426 | count = tmp->SCp.buffer->length; | |
2427 | d = sg_virt(tmp->SCp.buffer); | |
2428 | } else { | |
2429 | count = tmp->SCp.this_residual; | |
2430 | d = tmp->SCp.ptr; | |
2431 | } | |
2432 | /* setup this command for dma if not already */ | |
2433 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2434 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2435 | sun3_dma_setup_done = tmp; | |
2436 | } | |
2437 | } | |
2438 | ||
2439 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2440 | #endif | |
2441 | ||
c28bda25 RZ |
2442 | /* Accept message by clearing ACK */ |
2443 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2444 | |
e3f463b0 FT |
2445 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2446 | /* If the phase is still MSGIN, the target wants to send some more | |
2447 | * messages. In case it supports tagged queuing, this is probably a | |
2448 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2449 | */ | |
2450 | tag = TAG_NONE; | |
2451 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2452 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2453 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2454 | len = 2; | |
2455 | data = msg + 1; | |
2456 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2457 | msg[1] == SIMPLE_QUEUE_TAG) | |
2458 | tag = msg[2]; | |
2459 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2460 | HOSTNO, target_mask, lun, tag); | |
2461 | } | |
2462 | #endif | |
2463 | ||
c28bda25 | 2464 | hostdata->connected = tmp; |
9cb78c16 | 2465 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2466 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2467 | } |
2468 | ||
2469 | ||
2470 | /* | |
710ddd0d | 2471 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2472 | * |
2473 | * Purpose : abort a command | |
2474 | * | |
710ddd0d | 2475 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2476 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2477 | * used. |
2478 | * | |
b6c92b7e | 2479 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2480 | * |
c28bda25 RZ |
2481 | * XXX - there is no way to abort the command that is currently |
2482 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2483 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2484 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2485 | */ |
2486 | ||
2487 | static | |
710ddd0d | 2488 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2489 | { |
c28bda25 | 2490 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2491 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 2492 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2493 | unsigned long flags; |
1da177e4 | 2494 | |
1fa6b5fb | 2495 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2496 | |
11d2f63b | 2497 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2498 | |
e5c3fddf FT |
2499 | NCR5380_dprint(NDEBUG_ANY, instance); |
2500 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2501 | |
d65e634a | 2502 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2503 | NCR5380_read(BUS_AND_STATUS_REG), |
2504 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2505 | |
2506 | #if 1 | |
c28bda25 RZ |
2507 | /* |
2508 | * Case 1 : If the command is the currently executing command, | |
2509 | * we'll set the aborted flag and return control so that | |
2510 | * information transfer routine can exit cleanly. | |
2511 | */ | |
1da177e4 | 2512 | |
c28bda25 | 2513 | if (hostdata->connected == cmd) { |
1da177e4 | 2514 | |
d65e634a | 2515 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2516 | /* |
2517 | * We should perform BSY checking, and make sure we haven't slipped | |
2518 | * into BUS FREE. | |
2519 | */ | |
1da177e4 | 2520 | |
c28bda25 RZ |
2521 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2522 | /* | |
2523 | * Since we can't change phases until we've completed the current | |
2524 | * handshake, we have to source or sink a byte of data if the current | |
2525 | * phase is not MSGOUT. | |
2526 | */ | |
1da177e4 | 2527 | |
c28bda25 RZ |
2528 | /* |
2529 | * Return control to the executing NCR drive so we can clear the | |
2530 | * aborted flag and get back into our main loop. | |
2531 | */ | |
1da177e4 | 2532 | |
c28bda25 | 2533 | if (do_abort(instance) == 0) { |
c28bda25 RZ |
2534 | hostdata->connected = NULL; |
2535 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2536 | #ifdef SUPPORT_TAGS |
c28bda25 | 2537 | cmd_free_tag(cmd); |
1da177e4 | 2538 | #else |
c28bda25 | 2539 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2540 | #endif |
e3c3da67 | 2541 | maybe_release_dma_irq(instance); |
11d2f63b | 2542 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2543 | cmd->scsi_done(cmd); |
2b0f834c | 2544 | return SUCCESS; |
c28bda25 | 2545 | } else { |
11d2f63b | 2546 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2547 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2548 | return FAILED; |
c28bda25 RZ |
2549 | } |
2550 | } | |
1da177e4 LT |
2551 | #endif |
2552 | ||
c28bda25 RZ |
2553 | /* |
2554 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2555 | * from the issue queue. | |
2556 | */ | |
710ddd0d FT |
2557 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2558 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2559 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2560 | if (cmd == tmp) { | |
c28bda25 | 2561 | (*prev) = NEXT(tmp); |
3130d905 | 2562 | SET_NEXT(tmp, NULL); |
c28bda25 | 2563 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2564 | maybe_release_dma_irq(instance); |
11d2f63b | 2565 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2566 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2567 | HOSTNO); |
2568 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2569 | * yet... */ | |
2570 | tmp->scsi_done(tmp); | |
2b0f834c | 2571 | return SUCCESS; |
c28bda25 | 2572 | } |
1da177e4 LT |
2573 | } |
2574 | ||
c28bda25 RZ |
2575 | /* |
2576 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2577 | * and let the high level SCSI driver retry at a later time or | |
2578 | * issue a reset. | |
2579 | * | |
2580 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2581 | * and handling them cleanly in this situation would make the common | |
2582 | * case of noresets less efficient, and would pollute our code. So, | |
2583 | * we fail. | |
2584 | */ | |
1da177e4 | 2585 | |
c28bda25 | 2586 | if (hostdata->connected) { |
11d2f63b | 2587 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2588 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2589 | return FAILED; |
c28bda25 | 2590 | } |
1da177e4 | 2591 | |
c28bda25 RZ |
2592 | /* |
2593 | * Case 4: If the command is currently disconnected from the bus, and | |
2594 | * there are no connected commands, we reconnect the I_T_L or | |
2595 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2596 | * an abort message. | |
2597 | * | |
2598 | * This case is especially ugly. In order to reestablish the nexus, we | |
2599 | * need to call NCR5380_select(). The easiest way to implement this | |
2600 | * function was to abort if the bus was busy, and let the interrupt | |
2601 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2602 | * where necessary, meaning interrupts need to be enabled. | |
2603 | * | |
2604 | * When interrupts are enabled, the queues may change - so we | |
2605 | * can't remove it from the disconnected queue before selecting it | |
2606 | * because that could cause a failure in hashing the nexus if that | |
2607 | * device reselected. | |
2608 | * | |
2609 | * Since the queues may change, we can't use the pointers from when we | |
2610 | * first locate it. | |
2611 | * | |
2612 | * So, we must first locate the command, and if NCR5380_select() | |
2613 | * succeeds, then issue the abort, relocate the command and remove | |
2614 | * it from the disconnected queue. | |
2615 | */ | |
2616 | ||
710ddd0d | 2617 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2618 | tmp = NEXT(tmp)) { |
2619 | if (cmd == tmp) { | |
d65e634a | 2620 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2621 | |
11d2f63b FT |
2622 | if (NCR5380_select(instance, cmd)) { |
2623 | spin_unlock_irq(&hostdata->lock); | |
2b0f834c | 2624 | return FAILED; |
11d2f63b | 2625 | } |
d65e634a | 2626 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2627 | |
2628 | do_abort(instance); | |
2629 | ||
710ddd0d FT |
2630 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2631 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2632 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2633 | if (cmd == tmp) { | |
c28bda25 | 2634 | *prev = NEXT(tmp); |
3130d905 | 2635 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2636 | tmp->result = DID_ABORT << 16; |
2637 | /* We must unlock the tag/LUN immediately here, since the | |
2638 | * target goes to BUS FREE and doesn't send us another | |
2639 | * message (COMMAND_COMPLETE or the like) | |
2640 | */ | |
1da177e4 | 2641 | #ifdef SUPPORT_TAGS |
c28bda25 | 2642 | cmd_free_tag(tmp); |
1da177e4 | 2643 | #else |
c28bda25 | 2644 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2645 | #endif |
e3c3da67 | 2646 | maybe_release_dma_irq(instance); |
11d2f63b | 2647 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2648 | tmp->scsi_done(tmp); |
2b0f834c | 2649 | return SUCCESS; |
c28bda25 RZ |
2650 | } |
2651 | } | |
1da177e4 LT |
2652 | } |
2653 | } | |
2654 | ||
e3c3da67 FT |
2655 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2656 | * possible at all) At least, we should check if the lock could be | |
2657 | * released after the abort, in case it is kept due to some bug. | |
2658 | */ | |
2659 | maybe_release_dma_irq(instance); | |
11d2f63b | 2660 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2661 | |
c28bda25 RZ |
2662 | /* |
2663 | * Case 5 : If we reached this point, the command was not found in any of | |
2664 | * the queues. | |
2665 | * | |
2666 | * We probably reached this point because of an unlikely race condition | |
2667 | * between the command completing successfully and the abortion code, | |
2668 | * so we won't panic, but we will notify the user in case something really | |
2669 | * broke. | |
2670 | */ | |
1da177e4 | 2671 | |
ad361c98 | 2672 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2673 | |
2b0f834c | 2674 | return FAILED; |
1da177e4 LT |
2675 | } |
2676 | ||
2677 | ||
3be1b3ea FT |
2678 | /** |
2679 | * NCR5380_bus_reset - reset the SCSI bus | |
2680 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2681 | * |
3be1b3ea | 2682 | * Returns SUCCESS |
c28bda25 | 2683 | */ |
1da177e4 | 2684 | |
710ddd0d | 2685 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2686 | { |
e3c3da67 FT |
2687 | struct Scsi_Host *instance = cmd->device->host; |
2688 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2689 | int i; |
2690 | unsigned long flags; | |
1da177e4 | 2691 | |
11d2f63b | 2692 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2693 | |
2694 | #if (NDEBUG & NDEBUG_ANY) | |
2695 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
3be1b3ea | 2696 | #endif |
e5c3fddf FT |
2697 | NCR5380_dprint(NDEBUG_ANY, instance); |
2698 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2699 | |
2700 | do_reset(instance); | |
c28bda25 | 2701 | |
c28bda25 | 2702 | /* reset NCR registers */ |
c28bda25 RZ |
2703 | NCR5380_write(MODE_REG, MR_BASE); |
2704 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2705 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2706 | |
c28bda25 RZ |
2707 | /* After the reset, there are no more connected or disconnected commands |
2708 | * and no busy units; so clear the low-level status here to avoid | |
2709 | * conflicts when the mid-level code tries to wake up the affected | |
2710 | * commands! | |
2711 | */ | |
2712 | ||
2713 | if (hostdata->issue_queue) | |
dbb6b350 | 2714 | dsprintk(NDEBUG_ABORT, instance, "reset aborted issued command(s)\n"); |
c28bda25 | 2715 | if (hostdata->connected) |
dbb6b350 | 2716 | dsprintk(NDEBUG_ABORT, instance, "reset aborted a connected command\n"); |
c28bda25 | 2717 | if (hostdata->disconnected_queue) |
dbb6b350 | 2718 | dsprintk(NDEBUG_ABORT, instance, "reset aborted disconnected command(s)\n"); |
c28bda25 | 2719 | |
c28bda25 RZ |
2720 | hostdata->issue_queue = NULL; |
2721 | hostdata->connected = NULL; | |
2722 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2723 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2724 | free_all_tags(hostdata); |
1da177e4 | 2725 | #endif |
c28bda25 RZ |
2726 | for (i = 0; i < 8; ++i) |
2727 | hostdata->busy[i] = 0; | |
1da177e4 | 2728 | #ifdef REAL_DMA |
c28bda25 | 2729 | hostdata->dma_len = 0; |
1da177e4 | 2730 | #endif |
e3c3da67 FT |
2731 | |
2732 | maybe_release_dma_irq(instance); | |
11d2f63b | 2733 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2734 | |
2b0f834c | 2735 | return SUCCESS; |
1da177e4 | 2736 | } |