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 | 71 | #if (NDEBUG & NDEBUG_LISTS) |
c28bda25 RZ |
72 | #define LIST(x, y) \ |
73 | do { \ | |
74 | printk("LINE:%d Adding %p to %p\n", \ | |
75 | __LINE__, (void*)(x), (void*)(y)); \ | |
76 | if ((x) == (y)) \ | |
77 | udelay(5); \ | |
78 | } while (0) | |
79 | #define REMOVE(w, x, y, z) \ | |
80 | do { \ | |
81 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
82 | __LINE__, (void*)(w), (void*)(x), \ | |
83 | (void*)(y), (void*)(z)); \ | |
84 | if ((x) == (y)) \ | |
85 | udelay(5); \ | |
86 | } while (0) | |
1da177e4 LT |
87 | #else |
88 | #define LIST(x,y) | |
89 | #define REMOVE(w,x,y,z) | |
90 | #endif | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * Design | |
1da177e4 | 94 | * |
c28bda25 | 95 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 96 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 97 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
98 | * memory mapped) and drops this file in their 'C' wrapper. |
99 | * | |
c28bda25 | 100 | * As far as command queueing, two queues are maintained for |
1da177e4 | 101 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
102 | * and commands that are currently executing. This means that an |
103 | * unlimited number of commands may be queued, letting | |
104 | * more commands propagate from the higher driver levels giving higher | |
105 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
106 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
107 | * while a command is already executing. |
108 | * | |
1da177e4 | 109 | * |
c28bda25 | 110 | * Issues specific to the NCR5380 : |
1da177e4 | 111 | * |
c28bda25 RZ |
112 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
113 | * piece of hardware that requires you to sit in a loop polling for | |
114 | * the REQ signal as long as you are connected. Some devices are | |
115 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 116 | * while doing long seek operations. [...] These |
1da177e4 LT |
117 | * broken devices are the exception rather than the rule and I'd rather |
118 | * spend my time optimizing for the normal case. | |
119 | * | |
120 | * Architecture : | |
121 | * | |
122 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
123 | * which is started from a workqueue for each NCR5380 host in the |
124 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
125 | * removing the commands from the issue queue and calling | |
126 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
127 | * |
128 | * Once a nexus is established, the NCR5380_information_transfer() | |
129 | * phase goes through the various phases as instructed by the target. | |
130 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
131 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
132 | * queue, and NCR5380_main tries to find more work. If the target is |
133 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
134 | * |
135 | * If a command has disconnected, eventually an interrupt will trigger, | |
136 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
137 | * to reestablish a nexus. This will run main if necessary. | |
138 | * | |
c28bda25 | 139 | * On command termination, the done function will be called as |
1da177e4 LT |
140 | * appropriate. |
141 | * | |
c28bda25 | 142 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
143 | * structures, being initialized after the command is connected |
144 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
145 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
146 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
147 | */ | |
148 | ||
149 | /* | |
150 | * Using this file : | |
151 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 152 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
153 | * and macros and include this file in your driver. |
154 | * | |
c28bda25 | 155 | * These macros control options : |
1da177e4 | 156 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 157 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 158 | * |
ff50f9ed FT |
159 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
160 | * transceivers. | |
161 | * | |
1da177e4 LT |
162 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
163 | * | |
164 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
165 | * | |
166 | * These macros MUST be defined : | |
c28bda25 | 167 | * |
1da177e4 LT |
168 | * NCR5380_read(register) - read from the specified register |
169 | * | |
c28bda25 | 170 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 171 | * |
ff50f9ed FT |
172 | * NCR5380_implementation_fields - additional fields needed for this |
173 | * specific implementation of the NCR5380 | |
174 | * | |
1da177e4 | 175 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 176 | * REAL functions : |
1da177e4 | 177 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 178 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
179 | * that they were able to program the controller for. |
180 | * | |
c28bda25 | 181 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
182 | * available as NCR5380_i386_dma_write_setup, |
183 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
184 | * | |
185 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
186 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
187 | * NCR5380_dma_residual(instance); - residual count | |
188 | * | |
189 | * PSEUDO functions : | |
190 | * NCR5380_pwrite(instance, src, count) | |
191 | * NCR5380_pread(instance, dst, count); | |
192 | * | |
1da177e4 | 193 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 194 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 195 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 196 | * possible) function may be used. |
1da177e4 LT |
197 | */ |
198 | ||
710ddd0d | 199 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 200 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 201 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
202 | |
203 | #define HOSTNO instance->host_no | |
1da177e4 | 204 | |
636b1ec8 FT |
205 | static int do_abort(struct Scsi_Host *); |
206 | static void do_reset(struct Scsi_Host *); | |
207 | ||
1da177e4 LT |
208 | #ifdef SUPPORT_TAGS |
209 | ||
210 | /* | |
211 | * Functions for handling tagged queuing | |
212 | * ===================================== | |
213 | * | |
214 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
215 | * | |
216 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
217 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
218 | * command has been preempted for a long time. My solution: a bitfield for | |
219 | * remembering used tags. | |
220 | * | |
221 | * There's also the problem that each target has a certain queue size, but we | |
222 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
223 | * returned. So, in this case, the driver internal queue size assumption is | |
224 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 225 | * target. |
1da177e4 LT |
226 | * |
227 | * We're also not allowed running tagged commands as long as an untagged | |
228 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
229 | * condition _must_ be untagged. To keep track whether an untagged command has | |
230 | * been issued, the host->busy array is still employed, as it is without | |
231 | * support for tagged queuing. | |
232 | * | |
233 | * One could suspect that there are possible race conditions between | |
234 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
235 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
236 | * which already guaranteed to be running at most once. It is also the only | |
237 | * place where tags/LUNs are allocated. So no other allocation can slip | |
238 | * between that pair, there could only happen a reselection, which can free a | |
239 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
240 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
241 | */ | |
242 | ||
ca513fc9 | 243 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 244 | { |
c28bda25 | 245 | int target, lun; |
61d739a4 | 246 | struct tag_alloc *ta; |
c28bda25 | 247 | |
ca513fc9 | 248 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
249 | return; |
250 | ||
251 | for (target = 0; target < 8; ++target) { | |
252 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 253 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
254 | bitmap_zero(ta->allocated, MAX_TAGS); |
255 | ta->nr_allocated = 0; | |
256 | /* At the beginning, assume the maximum queue size we could | |
257 | * support (MAX_TAGS). This value will be decreased if the target | |
258 | * returns QUEUE_FULL status. | |
259 | */ | |
260 | ta->queue_size = MAX_TAGS; | |
261 | } | |
1da177e4 | 262 | } |
1da177e4 LT |
263 | } |
264 | ||
265 | ||
266 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
267 | * busy by an untagged command. If the command should use tagged queuing, also | |
268 | * check that there is a free tag and the target's queue won't overflow. This | |
269 | * function should be called with interrupts disabled to avoid race | |
270 | * conditions. | |
c28bda25 | 271 | */ |
1da177e4 | 272 | |
710ddd0d | 273 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 274 | { |
9cb78c16 | 275 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
276 | struct Scsi_Host *instance = cmd->device->host; |
277 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 278 | |
9cb78c16 | 279 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
280 | return 1; |
281 | if (!should_be_tagged || | |
ca513fc9 FT |
282 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
283 | !cmd->device->tagged_supported) | |
c28bda25 | 284 | return 0; |
61d739a4 FT |
285 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
286 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
287 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
288 | scmd_id(cmd), lun); | |
c28bda25 RZ |
289 | return 1; |
290 | } | |
291 | return 0; | |
1da177e4 LT |
292 | } |
293 | ||
294 | ||
295 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
296 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
297 | * untagged. | |
298 | */ | |
299 | ||
710ddd0d | 300 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 301 | { |
9cb78c16 | 302 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
303 | struct Scsi_Host *instance = cmd->device->host; |
304 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
305 | |
306 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
307 | * an untagged command. | |
308 | */ | |
309 | if (!should_be_tagged || | |
ca513fc9 FT |
310 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
311 | !cmd->device->tagged_supported) { | |
c28bda25 | 312 | cmd->tag = TAG_NONE; |
9cb78c16 | 313 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
314 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
315 | scmd_id(cmd), lun); | |
c28bda25 | 316 | } else { |
61d739a4 | 317 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
318 | |
319 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
320 | set_bit(cmd->tag, ta->allocated); | |
321 | ta->nr_allocated++; | |
dbb6b350 FT |
322 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
323 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 324 | } |
1da177e4 LT |
325 | } |
326 | ||
327 | ||
328 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
329 | * unlock the LUN. | |
330 | */ | |
331 | ||
710ddd0d | 332 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 333 | { |
9cb78c16 | 334 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
335 | struct Scsi_Host *instance = cmd->device->host; |
336 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
337 | |
338 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 339 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
340 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
341 | scmd_id(cmd), lun); | |
c28bda25 | 342 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
343 | shost_printk(KERN_NOTICE, instance, |
344 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 345 | } else { |
61d739a4 | 346 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
347 | clear_bit(cmd->tag, ta->allocated); |
348 | ta->nr_allocated--; | |
dbb6b350 FT |
349 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
350 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 351 | } |
1da177e4 LT |
352 | } |
353 | ||
354 | ||
ca513fc9 | 355 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 356 | { |
c28bda25 | 357 | int target, lun; |
61d739a4 | 358 | struct tag_alloc *ta; |
c28bda25 | 359 | |
ca513fc9 | 360 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
361 | return; |
362 | ||
363 | for (target = 0; target < 8; ++target) { | |
364 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 365 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
366 | bitmap_zero(ta->allocated, MAX_TAGS); |
367 | ta->nr_allocated = 0; | |
368 | } | |
1da177e4 | 369 | } |
1da177e4 LT |
370 | } |
371 | ||
372 | #endif /* SUPPORT_TAGS */ | |
373 | ||
374 | ||
375 | /* | |
710ddd0d | 376 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
377 | * |
378 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
379 | * transfer. This is possible if the scatter buffers lie on | |
380 | * physical contiguous addresses. | |
381 | * | |
710ddd0d | 382 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 383 | * The command to work on. The first scatter buffer's data are |
25985edc | 384 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
385 | */ |
386 | ||
710ddd0d | 387 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 388 | { |
e3f463b0 | 389 | #if !defined(CONFIG_SUN3) |
c28bda25 | 390 | unsigned long endaddr; |
1da177e4 | 391 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
392 | unsigned long oldlen = cmd->SCp.this_residual; |
393 | int cnt = 1; | |
1da177e4 LT |
394 | #endif |
395 | ||
c28bda25 RZ |
396 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
397 | cmd->SCp.buffers_residual && | |
5a1cb47f | 398 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 399 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 400 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 401 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 402 | ++cnt; |
1da177e4 | 403 | #endif |
c28bda25 RZ |
404 | ++cmd->SCp.buffer; |
405 | --cmd->SCp.buffers_residual; | |
406 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
407 | endaddr += cmd->SCp.buffer->length; | |
408 | } | |
1da177e4 | 409 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 410 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 411 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 412 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 413 | #endif |
e3f463b0 | 414 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
415 | } |
416 | ||
ff50f9ed FT |
417 | /** |
418 | * initialize_SCp - init the scsi pointer field | |
419 | * @cmd: command block to set up | |
1da177e4 | 420 | * |
ff50f9ed | 421 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
422 | */ |
423 | ||
710ddd0d | 424 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 425 | { |
c28bda25 RZ |
426 | /* |
427 | * Initialize the Scsi Pointer field so that all of the commands in the | |
428 | * various queues are valid. | |
1da177e4 | 429 | */ |
c28bda25 | 430 | |
9e0fe44d BH |
431 | if (scsi_bufflen(cmd)) { |
432 | cmd->SCp.buffer = scsi_sglist(cmd); | |
433 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 434 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
435 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
436 | /* ++roman: Try to merge some scatter-buffers if they are at | |
437 | * contiguous physical addresses. | |
438 | */ | |
439 | merge_contiguous_buffers(cmd); | |
440 | } else { | |
441 | cmd->SCp.buffer = NULL; | |
442 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
443 | cmd->SCp.ptr = NULL; |
444 | cmd->SCp.this_residual = 0; | |
c28bda25 | 445 | } |
1da177e4 LT |
446 | } |
447 | ||
636b1ec8 | 448 | /** |
b32ade12 | 449 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 450 | * @instance: controller to poll |
b32ade12 FT |
451 | * @reg1: 5380 register to poll |
452 | * @bit1: Bitmask to check | |
453 | * @val1: Expected value | |
454 | * @reg2: Second 5380 register to poll | |
455 | * @bit2: Second bitmask to check | |
456 | * @val2: Second expected value | |
2f854b82 | 457 | * @wait: Time-out in jiffies |
636b1ec8 | 458 | * |
2f854b82 FT |
459 | * Polls the chip in a reasonably efficient manner waiting for an |
460 | * event to occur. After a short quick poll we begin to yield the CPU | |
461 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
462 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 463 | * |
b32ade12 | 464 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
465 | */ |
466 | ||
b32ade12 FT |
467 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
468 | int reg1, int bit1, int val1, | |
469 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 470 | { |
2f854b82 FT |
471 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
472 | unsigned long deadline = jiffies + wait; | |
473 | unsigned long n; | |
474 | ||
475 | /* Busy-wait for up to 10 ms */ | |
476 | n = min(10000U, jiffies_to_usecs(wait)); | |
477 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 478 | n /= 2000; |
2f854b82 | 479 | do { |
b32ade12 FT |
480 | if ((NCR5380_read(reg1) & bit1) == val1) |
481 | return 0; | |
482 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
483 | return 0; |
484 | cpu_relax(); | |
2f854b82 FT |
485 | } while (n--); |
486 | ||
487 | if (irqs_disabled() || in_interrupt()) | |
488 | return -ETIMEDOUT; | |
636b1ec8 | 489 | |
2f854b82 FT |
490 | /* Repeatedly sleep for 1 ms until deadline */ |
491 | while (time_is_after_jiffies(deadline)) { | |
492 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
493 | if ((NCR5380_read(reg1) & bit1) == val1) |
494 | return 0; | |
495 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 496 | return 0; |
636b1ec8 | 497 | } |
2f854b82 | 498 | |
636b1ec8 FT |
499 | return -ETIMEDOUT; |
500 | } | |
501 | ||
b32ade12 FT |
502 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
503 | int reg, int bit, int val, int wait) | |
504 | { | |
505 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
506 | reg, bit, val, wait); | |
507 | } | |
508 | ||
1da177e4 LT |
509 | #if NDEBUG |
510 | static struct { | |
c28bda25 RZ |
511 | unsigned char mask; |
512 | const char *name; | |
513 | } signals[] = { | |
514 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
515 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
516 | { SR_SEL, "SEL" }, {0, NULL} | |
517 | }, basrs[] = { | |
518 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
519 | }, icrs[] = { | |
520 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
521 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
522 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
523 | {0, NULL} | |
524 | }, mrs[] = { | |
525 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
526 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
527 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
528 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
529 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
530 | {0, NULL} | |
531 | }; | |
1da177e4 | 532 | |
ff50f9ed FT |
533 | /** |
534 | * NCR5380_print - print scsi bus signals | |
535 | * @instance: adapter state to dump | |
1da177e4 | 536 | * |
ff50f9ed | 537 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
538 | */ |
539 | ||
c28bda25 RZ |
540 | static void NCR5380_print(struct Scsi_Host *instance) |
541 | { | |
542 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 543 | |
c28bda25 RZ |
544 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
545 | status = NCR5380_read(STATUS_REG); | |
546 | mr = NCR5380_read(MODE_REG); | |
547 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
548 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 549 | |
c28bda25 RZ |
550 | printk("STATUS_REG: %02x ", status); |
551 | for (i = 0; signals[i].mask; ++i) | |
552 | if (status & signals[i].mask) | |
553 | printk(",%s", signals[i].name); | |
554 | printk("\nBASR: %02x ", basr); | |
555 | for (i = 0; basrs[i].mask; ++i) | |
556 | if (basr & basrs[i].mask) | |
557 | printk(",%s", basrs[i].name); | |
558 | printk("\nICR: %02x ", icr); | |
559 | for (i = 0; icrs[i].mask; ++i) | |
560 | if (icr & icrs[i].mask) | |
561 | printk(",%s", icrs[i].name); | |
562 | printk("\nMODE: %02x ", mr); | |
563 | for (i = 0; mrs[i].mask; ++i) | |
564 | if (mr & mrs[i].mask) | |
565 | printk(",%s", mrs[i].name); | |
566 | printk("\n"); | |
1da177e4 LT |
567 | } |
568 | ||
569 | static struct { | |
c28bda25 RZ |
570 | unsigned char value; |
571 | const char *name; | |
1da177e4 | 572 | } phases[] = { |
c28bda25 RZ |
573 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
574 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
575 | {PHASE_UNKNOWN, "UNKNOWN"} | |
576 | }; | |
1da177e4 | 577 | |
ff50f9ed FT |
578 | /** |
579 | * NCR5380_print_phase - show SCSI phase | |
580 | * @instance: adapter to dump | |
1da177e4 | 581 | * |
ff50f9ed | 582 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 583 | * |
ff50f9ed | 584 | * Locks: none |
1da177e4 LT |
585 | */ |
586 | ||
587 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
588 | { | |
c28bda25 RZ |
589 | unsigned char status; |
590 | int i; | |
591 | ||
592 | status = NCR5380_read(STATUS_REG); | |
593 | if (!(status & SR_REQ)) | |
594 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
595 | else { | |
596 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
597 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
598 | ; | |
599 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
600 | } | |
1da177e4 LT |
601 | } |
602 | ||
1da177e4 LT |
603 | #endif |
604 | ||
8c32513b FT |
605 | /** |
606 | * NCR58380_info - report driver and host information | |
607 | * @instance: relevant scsi host instance | |
1da177e4 | 608 | * |
8c32513b | 609 | * For use as the host template info() handler. |
1da177e4 | 610 | * |
8c32513b | 611 | * Locks: none |
1da177e4 LT |
612 | */ |
613 | ||
8c32513b | 614 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 615 | { |
8c32513b FT |
616 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
617 | ||
618 | return hostdata->info; | |
619 | } | |
620 | ||
621 | static void prepare_info(struct Scsi_Host *instance) | |
622 | { | |
623 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
624 | ||
625 | snprintf(hostdata->info, sizeof(hostdata->info), | |
626 | "%s, io_port 0x%lx, n_io_port %d, " | |
627 | "base 0x%lx, irq %d, " | |
628 | "can_queue %d, cmd_per_lun %d, " | |
629 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 630 | "flags { %s%s}, " |
8c32513b FT |
631 | "options { %s} ", |
632 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
633 | instance->base, instance->irq, | |
634 | instance->can_queue, instance->cmd_per_lun, | |
635 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 636 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 637 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
638 | #ifdef DIFFERENTIAL |
639 | "DIFFERENTIAL " | |
640 | #endif | |
1da177e4 | 641 | #ifdef REAL_DMA |
8c32513b | 642 | "REAL_DMA " |
1da177e4 LT |
643 | #endif |
644 | #ifdef PARITY | |
8c32513b | 645 | "PARITY " |
1da177e4 LT |
646 | #endif |
647 | #ifdef SUPPORT_TAGS | |
8c32513b | 648 | "SUPPORT_TAGS " |
1da177e4 | 649 | #endif |
8c32513b | 650 | ""); |
1da177e4 LT |
651 | } |
652 | ||
ff50f9ed FT |
653 | /** |
654 | * NCR5380_init - initialise an NCR5380 | |
655 | * @instance: adapter to configure | |
656 | * @flags: control flags | |
1da177e4 | 657 | * |
ff50f9ed FT |
658 | * Initializes *instance and corresponding 5380 chip, |
659 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
660 | * |
661 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 662 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 663 | * |
ff50f9ed | 664 | * Returns 0 for success |
1da177e4 LT |
665 | */ |
666 | ||
95fde7a8 | 667 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 668 | { |
e8a60144 | 669 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 670 | int i; |
2f854b82 | 671 | unsigned long deadline; |
c28bda25 | 672 | |
a53a21e4 | 673 | hostdata->host = instance; |
c28bda25 RZ |
674 | hostdata->id_mask = 1 << instance->this_id; |
675 | hostdata->id_higher_mask = 0; | |
676 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
677 | if (i > hostdata->id_mask) | |
678 | hostdata->id_higher_mask |= i; | |
679 | for (i = 0; i < 8; ++i) | |
680 | hostdata->busy[i] = 0; | |
1da177e4 | 681 | #ifdef SUPPORT_TAGS |
ca513fc9 | 682 | init_tags(hostdata); |
1da177e4 LT |
683 | #endif |
684 | #if defined (REAL_DMA) | |
c28bda25 | 685 | hostdata->dma_len = 0; |
1da177e4 | 686 | #endif |
11d2f63b | 687 | spin_lock_init(&hostdata->lock); |
c28bda25 RZ |
688 | hostdata->connected = NULL; |
689 | hostdata->issue_queue = NULL; | |
690 | hostdata->disconnected_queue = NULL; | |
ef1081cb | 691 | hostdata->flags = flags; |
c28bda25 | 692 | |
a53a21e4 | 693 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
694 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
695 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
696 | 1, instance->host_no); | |
697 | if (!hostdata->work_q) | |
698 | return -ENOMEM; | |
1da177e4 | 699 | |
8c32513b FT |
700 | prepare_info(instance); |
701 | ||
c28bda25 RZ |
702 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
703 | NCR5380_write(MODE_REG, MR_BASE); | |
704 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
705 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 706 | |
2f854b82 FT |
707 | /* Calibrate register polling loop */ |
708 | i = 0; | |
709 | deadline = jiffies + 1; | |
710 | do { | |
711 | cpu_relax(); | |
712 | } while (time_is_after_jiffies(deadline)); | |
713 | deadline += msecs_to_jiffies(256); | |
714 | do { | |
715 | NCR5380_read(STATUS_REG); | |
716 | ++i; | |
717 | cpu_relax(); | |
718 | } while (time_is_after_jiffies(deadline)); | |
719 | hostdata->accesses_per_ms = i / 256; | |
720 | ||
c28bda25 | 721 | return 0; |
1da177e4 LT |
722 | } |
723 | ||
636b1ec8 FT |
724 | /** |
725 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
726 | * @instance: adapter to check | |
727 | * | |
728 | * If the system crashed, it may have crashed with a connected target and | |
729 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
730 | * currently established nexus, which we know nothing about. Failing that | |
731 | * do a bus reset. | |
732 | * | |
733 | * Note that a bus reset will cause the chip to assert IRQ. | |
734 | * | |
735 | * Returns 0 if successful, otherwise -ENXIO. | |
736 | */ | |
737 | ||
738 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
739 | { | |
9c3f0e2b | 740 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
741 | int pass; |
742 | ||
743 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
744 | switch (pass) { | |
745 | case 1: | |
746 | case 3: | |
747 | case 5: | |
748 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
749 | NCR5380_poll_politely(instance, | |
750 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
751 | break; | |
752 | case 2: | |
753 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
754 | do_abort(instance); | |
755 | break; | |
756 | case 4: | |
757 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
758 | do_reset(instance); | |
9c3f0e2b FT |
759 | /* Wait after a reset; the SCSI standard calls for |
760 | * 250ms, we wait 500ms to be on the safe side. | |
761 | * But some Toshiba CD-ROMs need ten times that. | |
762 | */ | |
763 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
764 | msleep(2500); | |
765 | else | |
766 | msleep(500); | |
636b1ec8 FT |
767 | break; |
768 | case 6: | |
769 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
770 | return -ENXIO; | |
771 | } | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
ff50f9ed FT |
776 | /** |
777 | * NCR5380_exit - remove an NCR5380 | |
778 | * @instance: adapter to remove | |
779 | * | |
780 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
781 | */ | |
782 | ||
6323e4fe GU |
783 | static void NCR5380_exit(struct Scsi_Host *instance) |
784 | { | |
a53a21e4 FT |
785 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
786 | ||
787 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 788 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
789 | } |
790 | ||
ff50f9ed FT |
791 | /** |
792 | * NCR5380_queue_command - queue a command | |
793 | * @instance: the relevant SCSI adapter | |
794 | * @cmd: SCSI command | |
1da177e4 | 795 | * |
1bb40589 | 796 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
797 | * twiddling done to the host specific fields of cmd. If the |
798 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
799 | */ |
800 | ||
16b29e75 FT |
801 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
802 | struct scsi_cmnd *cmd) | |
1da177e4 | 803 | { |
16b29e75 | 804 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 805 | struct scsi_cmnd *tmp; |
c28bda25 | 806 | unsigned long flags; |
1da177e4 LT |
807 | |
808 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
809 | switch (cmd->cmnd[0]) { |
810 | case WRITE_6: | |
811 | case WRITE_10: | |
dbb6b350 | 812 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 813 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 814 | cmd->scsi_done(cmd); |
c28bda25 RZ |
815 | return 0; |
816 | } | |
1da177e4 LT |
817 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
818 | ||
c28bda25 RZ |
819 | /* |
820 | * We use the host_scribble field as a pointer to the next command | |
821 | * in a queue | |
822 | */ | |
823 | ||
3130d905 | 824 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
825 | cmd->result = 0; |
826 | ||
827 | /* | |
828 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
829 | * commands are added to the head of the queue since any command will | |
830 | * clear the contingent allegiance condition that exists and the | |
831 | * sense data is only guaranteed to be valid while the condition exists. | |
832 | */ | |
833 | ||
c28bda25 RZ |
834 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
835 | * Otherwise a running NCR5380_main may steal the lock. | |
836 | * Lock before actually inserting due to fairness reasons explained in | |
837 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
838 | * to release the lock. | |
839 | * Stop timer for this command while waiting for the lock, or timeouts | |
840 | * may happen (and they really do), and it's no good if the command doesn't | |
841 | * appear in any of the queues. | |
842 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
843 | * because also a timer int can trigger an abort or reset, which would | |
844 | * alter queues and touch the lock. | |
845 | */ | |
e3c3da67 | 846 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
847 | return SCSI_MLQUEUE_HOST_BUSY; |
848 | ||
11d2f63b | 849 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 850 | |
ff50f9ed FT |
851 | /* |
852 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
853 | * commands are added to the head of the queue since any command will | |
854 | * clear the contingent allegiance condition that exists and the | |
855 | * sense data is only guaranteed to be valid while the condition exists. | |
856 | */ | |
857 | ||
c28bda25 RZ |
858 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
859 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 860 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
861 | hostdata->issue_queue = cmd; |
862 | } else { | |
710ddd0d | 863 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
864 | NEXT(tmp); tmp = NEXT(tmp)) |
865 | ; | |
866 | LIST(cmd, tmp); | |
3130d905 | 867 | SET_NEXT(tmp, cmd); |
c28bda25 | 868 | } |
11d2f63b | 869 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 870 | |
dbb6b350 FT |
871 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
872 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 873 | |
010e89d1 FT |
874 | /* Kick off command processing */ |
875 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 876 | return 0; |
1da177e4 LT |
877 | } |
878 | ||
e3c3da67 FT |
879 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
880 | { | |
881 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
882 | ||
883 | /* Caller does the locking needed to set & test these data atomically */ | |
884 | if (!hostdata->disconnected_queue && | |
885 | !hostdata->issue_queue && | |
886 | !hostdata->connected && | |
887 | !hostdata->retain_dma_intr) | |
888 | NCR5380_release_dma_irq(instance); | |
889 | } | |
890 | ||
ff50f9ed FT |
891 | /** |
892 | * NCR5380_main - NCR state machines | |
1da177e4 | 893 | * |
ff50f9ed FT |
894 | * NCR5380_main is a coroutine that runs as long as more work can |
895 | * be done on the NCR5380 host adapters in a system. Both | |
896 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
897 | * in case it is not running. | |
c28bda25 | 898 | * |
ff50f9ed | 899 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
900 | */ |
901 | ||
b312b38c | 902 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 903 | { |
a53a21e4 FT |
904 | struct NCR5380_hostdata *hostdata = |
905 | container_of(work, struct NCR5380_hostdata, main_task); | |
906 | struct Scsi_Host *instance = hostdata->host; | |
710ddd0d | 907 | struct scsi_cmnd *tmp, *prev; |
c28bda25 | 908 | int done; |
c28bda25 RZ |
909 | |
910 | /* | |
c28bda25 RZ |
911 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
912 | * because also a timer int can trigger an abort or reset, which can | |
913 | * alter queues and touch the Falcon lock. | |
914 | */ | |
915 | ||
11d2f63b | 916 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 917 | do { |
c28bda25 RZ |
918 | done = 1; |
919 | ||
920 | if (!hostdata->connected) { | |
d65e634a | 921 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
922 | /* |
923 | * Search through the issue_queue for a command destined | |
924 | * for a target that's not busy. | |
925 | */ | |
1da177e4 | 926 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 927 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
928 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
929 | ; | |
930 | /*printk("%p ", tmp);*/ | |
931 | if ((tmp == prev) && tmp) | |
932 | printk(" LOOP\n"); | |
933 | /* else printk("\n"); */ | |
1da177e4 | 934 | #endif |
710ddd0d | 935 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 936 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 937 | u8 lun = tmp->device->lun; |
1da177e4 | 938 | |
e3f463b0 FT |
939 | dprintk(NDEBUG_LISTS, |
940 | "MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
941 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], | |
942 | lun); | |
c28bda25 | 943 | /* When we find one, remove it from the issue queue. */ |
c28bda25 | 944 | if ( |
1da177e4 | 945 | #ifdef SUPPORT_TAGS |
c28bda25 | 946 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 947 | #else |
9cb78c16 | 948 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 949 | #endif |
c28bda25 | 950 | ) { |
c28bda25 RZ |
951 | if (prev) { |
952 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 953 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
954 | } else { |
955 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
956 | hostdata->issue_queue = NEXT(tmp); | |
957 | } | |
3130d905 | 958 | SET_NEXT(tmp, NULL); |
ef1081cb | 959 | hostdata->retain_dma_intr++; |
c28bda25 | 960 | |
c28bda25 RZ |
961 | /* |
962 | * Attempt to establish an I_T_L nexus here. | |
963 | * On success, instance->hostdata->connected is set. | |
964 | * On failure, we must add the command back to the | |
965 | * issue queue so we can keep trying. | |
966 | */ | |
d65e634a | 967 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 968 | "lun %d removed from issue_queue\n", |
9cb78c16 | 969 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
970 | /* |
971 | * REQUEST SENSE commands are issued without tagged | |
972 | * queueing, even on SCSI-II devices because the | |
973 | * contingent allegiance condition exists for the | |
974 | * entire unit. | |
975 | */ | |
976 | /* ++roman: ...and the standard also requires that | |
977 | * REQUEST SENSE command are untagged. | |
978 | */ | |
979 | ||
1da177e4 | 980 | #ifdef SUPPORT_TAGS |
c28bda25 | 981 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 982 | #endif |
76f13b93 | 983 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 984 | /* OK or bad target */ |
ef1081cb | 985 | hostdata->retain_dma_intr--; |
e3c3da67 | 986 | maybe_release_dma_irq(instance); |
c28bda25 | 987 | } else { |
1f1b0c74 | 988 | /* Need to retry */ |
c28bda25 | 989 | LIST(tmp, hostdata->issue_queue); |
3130d905 | 990 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 991 | hostdata->issue_queue = tmp; |
1da177e4 | 992 | #ifdef SUPPORT_TAGS |
c28bda25 | 993 | cmd_free_tag(tmp); |
1da177e4 | 994 | #endif |
ef1081cb | 995 | hostdata->retain_dma_intr--; |
1d3db59d | 996 | done = 0; |
d65e634a | 997 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 | 998 | "returned to issue_queue\n", HOSTNO); |
c28bda25 | 999 | } |
1f1b0c74 FT |
1000 | if (hostdata->connected) |
1001 | break; | |
c28bda25 RZ |
1002 | } /* if target/lun/target queue is not busy */ |
1003 | } /* for issue_queue */ | |
1004 | } /* if (!hostdata->connected) */ | |
1005 | ||
1006 | if (hostdata->connected | |
1da177e4 | 1007 | #ifdef REAL_DMA |
c28bda25 | 1008 | && !hostdata->dma_len |
1da177e4 | 1009 | #endif |
c28bda25 | 1010 | ) { |
d65e634a | 1011 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1012 | HOSTNO); |
1013 | NCR5380_information_transfer(instance); | |
d65e634a | 1014 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1015 | done = 0; |
1016 | } | |
1017 | } while (!done); | |
11d2f63b | 1018 | spin_unlock_irq(&hostdata->lock); |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | ||
1022 | #ifdef REAL_DMA | |
1023 | /* | |
1024 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1025 | * | |
1026 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1027 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1028 | * |
1029 | * Inputs : instance - this instance of the NCR5380. | |
1030 | * | |
1031 | */ | |
1032 | ||
c28bda25 | 1033 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1034 | { |
e8a60144 | 1035 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
01bd9081 | 1036 | int transferred; |
e3f463b0 | 1037 | unsigned char **data; |
c28bda25 | 1038 | volatile int *count; |
e3f463b0 FT |
1039 | int saved_data = 0, overrun = 0; |
1040 | unsigned char p; | |
c28bda25 | 1041 | |
ef1081cb | 1042 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1043 | p = hostdata->connected->SCp.phase; |
1044 | if (p & SR_IO) { | |
1045 | udelay(10); | |
1046 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1047 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1048 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1049 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1050 | overrun = 1; | |
d65e634a | 1051 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1052 | } |
1053 | } | |
1054 | } | |
1055 | ||
e3f463b0 FT |
1056 | #if defined(CONFIG_SUN3) |
1057 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1058 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1059 | instance->host_no); | |
1060 | BUG(); | |
1061 | } | |
1062 | ||
1063 | /* make sure we're not stuck in a data phase */ | |
1064 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1065 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1066 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1067 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1068 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1069 | instance->host_no); | |
1070 | BUG(); | |
1071 | } | |
1072 | #endif | |
1073 | ||
c28bda25 RZ |
1074 | NCR5380_write(MODE_REG, MR_BASE); |
1075 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1076 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1077 | |
01bd9081 | 1078 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1079 | hostdata->dma_len = 0; |
1080 | ||
1081 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1082 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1083 | *data += transferred; |
1084 | *count -= transferred; | |
c28bda25 | 1085 | |
ef1081cb | 1086 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1087 | int cnt, toPIO; |
1088 | ||
c28bda25 | 1089 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1090 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1091 | if (overrun) { |
d65e634a | 1092 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1093 | *(*data)++ = saved_data; |
1094 | (*count)--; | |
1095 | cnt--; | |
1096 | toPIO--; | |
1097 | } | |
d65e634a | 1098 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1099 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1100 | *count -= toPIO - cnt; | |
1101 | } | |
1da177e4 | 1102 | } |
1da177e4 LT |
1103 | } |
1104 | #endif /* REAL_DMA */ | |
1105 | ||
1106 | ||
ff50f9ed FT |
1107 | /** |
1108 | * NCR5380_intr - generic NCR5380 irq handler | |
1109 | * @irq: interrupt number | |
1110 | * @dev_id: device info | |
1da177e4 | 1111 | * |
ff50f9ed FT |
1112 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1113 | * from the disconnected queue, and restarting NCR5380_main() | |
1114 | * as required. | |
cd400825 FT |
1115 | * |
1116 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1117 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1118 | * Three of these six conditions are latched in the Bus and Status Register: | |
1119 | * - End of DMA (cleared by ending DMA Mode) | |
1120 | * - Parity error (cleared by reading RPIR) | |
1121 | * - Loss of BSY (cleared by reading RPIR) | |
1122 | * Two conditions have flag bits that are not latched: | |
1123 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1124 | * - Bus reset (non-maskable) | |
1125 | * The remaining condition has no flag bit at all: | |
1126 | * - Selection/reselection | |
1127 | * | |
1128 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1129 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1130 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1131 | * interrupts will not be lost (they can be on the DP5380)." | |
1132 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1133 | * | |
1134 | * Checking for bus reset by reading RST is futile because of interrupt | |
1135 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1136 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1137 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1138 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1139 | */ |
1140 | ||
c28bda25 | 1141 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1142 | { |
a53a21e4 | 1143 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1144 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1145 | int handled = 0; |
c28bda25 | 1146 | unsigned char basr; |
11d2f63b FT |
1147 | unsigned long flags; |
1148 | ||
1149 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1150 | |
c28bda25 | 1151 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1152 | if (basr & BASR_IRQ) { |
cd400825 FT |
1153 | unsigned char mr = NCR5380_read(MODE_REG); |
1154 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1155 | ||
1156 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1157 | HOSTNO, irq, basr, sr, mr); | |
1da177e4 LT |
1158 | |
1159 | #if defined(REAL_DMA) | |
cd400825 FT |
1160 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1161 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1162 | * We ack IRQ after clearing Mode Register. Workarounds | |
1163 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1164 | */ |
1165 | ||
cd400825 | 1166 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO); |
c28bda25 | 1167 | |
cd400825 FT |
1168 | if (hostdata->connected) { |
1169 | NCR5380_dma_complete(instance); | |
1170 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1171 | } else { | |
1172 | NCR5380_write(MODE_REG, MR_BASE); | |
1173 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1174 | } | |
1175 | } else | |
1da177e4 | 1176 | #endif /* REAL_DMA */ |
cd400825 FT |
1177 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1178 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1179 | /* Probably reselected */ | |
1180 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1181 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1182 | ||
1183 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1184 | HOSTNO); | |
1185 | ||
1186 | if (!hostdata->connected) { | |
1187 | NCR5380_reselect(instance); | |
1188 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1189 | } | |
1190 | if (!hostdata->connected) | |
1191 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1192 | } else { | |
1193 | /* Probably Bus Reset */ | |
1194 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1195 | ||
1196 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO); | |
e3f463b0 | 1197 | #ifdef SUN3_SCSI_VME |
cd400825 | 1198 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1199 | #endif |
cd400825 | 1200 | } |
c28bda25 | 1201 | handled = 1; |
cd400825 FT |
1202 | } else { |
1203 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1204 | #ifdef SUN3_SCSI_VME |
1205 | dregs->csr |= CSR_DMA_ENABLE; | |
1206 | #endif | |
c28bda25 RZ |
1207 | } |
1208 | ||
11d2f63b FT |
1209 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1210 | ||
c28bda25 | 1211 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1212 | } |
1213 | ||
c28bda25 | 1214 | /* |
710ddd0d FT |
1215 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1216 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1217 | * |
1218 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1219 | * including ARBITRATION, SELECTION, and initial message out for |
1220 | * IDENTIFY and queue messages. | |
1da177e4 | 1221 | * |
c28bda25 | 1222 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1223 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1224 | * |
6323876f FT |
1225 | * Returns : -1 if selection failed but should be retried. |
1226 | * 0 if selection failed and should not be retried. | |
1227 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1228 | * |
c28bda25 RZ |
1229 | * Side effects : |
1230 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1231 | * with registers as they should have been on entry - ie |
1232 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1233 | * will cease to drive any SCSI bus signals. | |
1234 | * | |
c28bda25 RZ |
1235 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1236 | * instance->connected will be set to cmd. | |
1237 | * SELECT interrupt will be disabled. | |
1da177e4 | 1238 | * |
c28bda25 | 1239 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1240 | * cmd->result host byte set to DID_BAD_TARGET. |
1241 | */ | |
1242 | ||
710ddd0d | 1243 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1244 | { |
e8a60144 | 1245 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1246 | unsigned char tmp[3], phase; |
1247 | unsigned char *data; | |
1248 | int len; | |
ae753a33 | 1249 | int err; |
c28bda25 | 1250 | |
8ad3a593 | 1251 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1252 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1253 | instance->this_id); |
1254 | ||
1255 | /* | |
1256 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1257 | * data bus during SELECTION. | |
1258 | */ | |
1259 | ||
c28bda25 | 1260 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1261 | |
c28bda25 RZ |
1262 | /* |
1263 | * Start arbitration. | |
1264 | */ | |
1da177e4 | 1265 | |
c28bda25 RZ |
1266 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1267 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1268 | |
55500d9b FT |
1269 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1270 | * Bus Free Delay, arbitration will begin. | |
1271 | */ | |
c28bda25 | 1272 | |
11d2f63b | 1273 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1274 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1275 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1276 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1277 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1278 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1279 | /* Reselection interrupt */ | |
1280 | return -1; | |
1281 | } | |
1282 | if (err < 0) { | |
1283 | NCR5380_write(MODE_REG, MR_BASE); | |
1284 | shost_printk(KERN_ERR, instance, | |
1285 | "select: arbitration timeout\n"); | |
1286 | return -1; | |
c28bda25 | 1287 | } |
11d2f63b | 1288 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1289 | |
55500d9b | 1290 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1291 | udelay(3); |
1292 | ||
1293 | /* Check for lost arbitration */ | |
1294 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1295 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1296 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1297 | NCR5380_write(MODE_REG, MR_BASE); |
d65e634a | 1298 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 | 1299 | HOSTNO); |
11d2f63b | 1300 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1301 | return -1; |
1302 | } | |
1da177e4 | 1303 | |
cf13b083 FT |
1304 | /* After/during arbitration, BSY should be asserted. |
1305 | * IBM DPES-31080 Version S31Q works now | |
1306 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1307 | */ | |
c28bda25 RZ |
1308 | NCR5380_write(INITIATOR_COMMAND_REG, |
1309 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1310 | ||
c28bda25 RZ |
1311 | /* |
1312 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1313 | * a minimum so we'll udelay ceil(1.2) | |
1314 | */ | |
1da177e4 | 1315 | |
9c3f0e2b FT |
1316 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1317 | udelay(15); | |
1318 | else | |
1319 | udelay(2); | |
c28bda25 | 1320 | |
11d2f63b FT |
1321 | spin_lock_irq(&hostdata->lock); |
1322 | ||
72064a78 FT |
1323 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1324 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
c28bda25 | 1325 | return -1; |
c28bda25 | 1326 | |
d65e634a | 1327 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1328 | |
1329 | /* | |
1330 | * Now that we have won arbitration, start Selection process, asserting | |
1331 | * the host and target ID's on the SCSI bus. | |
1332 | */ | |
1333 | ||
1334 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1335 | ||
1336 | /* | |
1337 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1338 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1339 | * phase immediately after selection. | |
1340 | */ | |
1341 | ||
1342 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1343 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1344 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1345 | |
c28bda25 RZ |
1346 | /* |
1347 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1348 | * otherwise we will trigger an interrupt. | |
1349 | */ | |
c28bda25 | 1350 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1351 | |
11d2f63b FT |
1352 | spin_unlock_irq(&hostdata->lock); |
1353 | ||
c28bda25 RZ |
1354 | /* |
1355 | * The initiator shall then wait at least two deskew delays and release | |
1356 | * the BSY signal. | |
1357 | */ | |
1358 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1359 | ||
1360 | /* Reset BSY */ | |
1361 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1362 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1363 | ||
1364 | /* | |
1365 | * Something weird happens when we cease to drive BSY - looks | |
1366 | * like the board/chip is letting us do another read before the | |
1367 | * appropriate propagation delay has expired, and we're confusing | |
1368 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1369 | * | |
1370 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1371 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1372 | * tighter 'C' code breaks and requires this) solves the problem - | |
1373 | * the 1 us delay is arbitrary, and only used because this delay will | |
1374 | * be the same on other platforms and since it works here, it should | |
1375 | * work there. | |
1376 | * | |
1377 | * wingel suggests that this could be due to failing to wait | |
1378 | * one deskew delay. | |
1379 | */ | |
1da177e4 | 1380 | |
c28bda25 | 1381 | udelay(1); |
1da177e4 | 1382 | |
d65e634a | 1383 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1384 | |
c28bda25 RZ |
1385 | /* |
1386 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1387 | * selection. | |
1388 | */ | |
1da177e4 | 1389 | |
ae753a33 FT |
1390 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1391 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1392 | |
1393 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1394 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1395 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1396 | NCR5380_reselect(instance); | |
cd400825 FT |
1397 | if (!hostdata->connected) |
1398 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
c28bda25 RZ |
1399 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
1400 | HOSTNO); | |
c28bda25 RZ |
1401 | return -1; |
1402 | } | |
1da177e4 | 1403 | |
ae753a33 | 1404 | if (err < 0) { |
11d2f63b | 1405 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1406 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1407 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1408 | #ifdef SUPPORT_TAGS |
c28bda25 | 1409 | cmd_free_tag(cmd); |
1da177e4 | 1410 | #endif |
c28bda25 RZ |
1411 | cmd->scsi_done(cmd); |
1412 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1413 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1414 | return 0; |
1415 | } | |
1416 | ||
ae753a33 FT |
1417 | /* |
1418 | * No less than two deskew delays after the initiator detects the | |
1419 | * BSY signal is true, it shall release the SEL signal and may | |
1420 | * change the DATA BUS. -wingel | |
1421 | */ | |
1422 | ||
1423 | udelay(1); | |
1424 | ||
1425 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1426 | ||
c28bda25 RZ |
1427 | /* |
1428 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1429 | * was true but before BSY was false during selection, the information | |
1430 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1431 | * IDENTIFY message. | |
1432 | * | |
1433 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1434 | * message (2 bytes) with a tag ID that we increment with every command | |
1435 | * until it wraps back to 0. | |
1436 | * | |
1437 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1438 | * which claim to support tagged queuing but fail when more than | |
1439 | * some number of commands are issued at once. | |
1440 | */ | |
1441 | ||
1442 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1443 | |
1444 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1445 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1446 | if (err < 0) { |
1447 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1448 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1449 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1450 | return -1; | |
1451 | } | |
c28bda25 | 1452 | |
d65e634a | 1453 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1454 | HOSTNO, cmd->device->id); |
1455 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1456 | |
1457 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1458 | if (cmd->tag != TAG_NONE) { |
1459 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1460 | tmp[2] = cmd->tag; | |
1461 | len = 3; | |
1462 | } else | |
1463 | len = 1; | |
1da177e4 | 1464 | #else |
c28bda25 RZ |
1465 | len = 1; |
1466 | cmd->tag = 0; | |
1da177e4 LT |
1467 | #endif /* SUPPORT_TAGS */ |
1468 | ||
c28bda25 RZ |
1469 | /* Send message(s) */ |
1470 | data = tmp; | |
1471 | phase = PHASE_MSGOUT; | |
1472 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1473 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 | 1474 | /* XXX need to handle errors here */ |
11d2f63b | 1475 | |
c28bda25 | 1476 | hostdata->connected = cmd; |
1da177e4 | 1477 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1478 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1479 | #endif | |
e3f463b0 FT |
1480 | #ifdef SUN3_SCSI_VME |
1481 | dregs->csr |= CSR_INTR; | |
1482 | #endif | |
1da177e4 | 1483 | |
c28bda25 | 1484 | initialize_SCp(cmd); |
1da177e4 | 1485 | |
c28bda25 | 1486 | return 0; |
1da177e4 LT |
1487 | } |
1488 | ||
c28bda25 RZ |
1489 | /* |
1490 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1491 | * unsigned char *phase, int *count, unsigned char **data) |
1492 | * | |
1493 | * Purpose : transfers data in given phase using polled I/O | |
1494 | * | |
c28bda25 RZ |
1495 | * Inputs : instance - instance of driver, *phase - pointer to |
1496 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1497 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1498 | * |
1da177e4 | 1499 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1500 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1501 | * is in same phase. |
1502 | * | |
c28bda25 | 1503 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1504 | * |
1505 | * XXX Note : handling for bus free may be useful. | |
1506 | */ | |
1507 | ||
1508 | /* | |
c28bda25 | 1509 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1510 | * IS 100% reliable, and for the actual data transfer where speed |
1511 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1512 | */ | |
1513 | ||
c28bda25 RZ |
1514 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1515 | unsigned char *phase, int *count, | |
1516 | unsigned char **data) | |
1da177e4 | 1517 | { |
c28bda25 RZ |
1518 | register unsigned char p = *phase, tmp; |
1519 | register int c = *count; | |
1520 | register unsigned char *d = *data; | |
1521 | ||
1522 | /* | |
1523 | * The NCR5380 chip will only drive the SCSI bus when the | |
1524 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1525 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1526 | */ |
1da177e4 | 1527 | |
c28bda25 | 1528 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1529 | |
c28bda25 RZ |
1530 | do { |
1531 | /* | |
1532 | * Wait for assertion of REQ, after which the phase bits will be | |
1533 | * valid | |
1534 | */ | |
686f3990 FT |
1535 | |
1536 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1537 | break; | |
1da177e4 | 1538 | |
d65e634a | 1539 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1540 | |
c28bda25 | 1541 | /* Check for phase mismatch */ |
686f3990 | 1542 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1543 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1544 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1545 | break; |
1546 | } | |
1da177e4 | 1547 | |
c28bda25 RZ |
1548 | /* Do actual transfer from SCSI bus to / from memory */ |
1549 | if (!(p & SR_IO)) | |
1550 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1551 | else | |
1552 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1553 | |
c28bda25 | 1554 | ++d; |
1da177e4 | 1555 | |
c28bda25 RZ |
1556 | /* |
1557 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1558 | * should drop ATN on the last byte of the message phase | |
1559 | * after REQ has been asserted for the handshake but before | |
1560 | * the initiator raises ACK. | |
1561 | */ | |
1da177e4 | 1562 | |
c28bda25 RZ |
1563 | if (!(p & SR_IO)) { |
1564 | if (!((p & SR_MSG) && c > 1)) { | |
1565 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1566 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1567 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1568 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1569 | } else { | |
1570 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1571 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1572 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1573 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1574 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1575 | } | |
1576 | } else { | |
8ad3a593 | 1577 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1578 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1579 | } | |
1da177e4 | 1580 | |
a2edc4a6 FT |
1581 | if (NCR5380_poll_politely(instance, |
1582 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1583 | break; | |
c28bda25 | 1584 | |
d65e634a | 1585 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1586 | |
1587 | /* | |
1588 | * We have several special cases to consider during REQ/ACK handshaking : | |
1589 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1590 | * message. ATN must be dropped as ACK is dropped. | |
1591 | * | |
1592 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1593 | * message. We must exit with ACK asserted, so that the calling | |
1594 | * code may raise ATN before dropping ACK to reject the message. | |
1595 | * | |
1596 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1597 | */ | |
1598 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1599 | if (p == PHASE_MSGOUT && c > 1) | |
1600 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1601 | else | |
1602 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1603 | } | |
1604 | } while (--c); | |
1605 | ||
d65e634a | 1606 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1607 | |
1608 | *count = c; | |
1609 | *data = d; | |
1610 | tmp = NCR5380_read(STATUS_REG); | |
1611 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1612 | * asserted or if ACK hasn't been released yet. The latter applies if |
1613 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1614 | */ |
a2edc4a6 | 1615 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1616 | *phase = tmp & PHASE_MASK; |
1617 | else | |
1618 | *phase = PHASE_UNKNOWN; | |
1619 | ||
1620 | if (!c || (*phase == p)) | |
1621 | return 0; | |
1622 | else | |
1623 | return -1; | |
1da177e4 LT |
1624 | } |
1625 | ||
636b1ec8 FT |
1626 | /** |
1627 | * do_reset - issue a reset command | |
1628 | * @instance: adapter to reset | |
1629 | * | |
1630 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1631 | * back into sane shape. | |
1632 | * | |
1633 | * This clears the reset interrupt flag because there may be no handler for | |
1634 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1635 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1636 | */ | |
1637 | ||
1638 | static void do_reset(struct Scsi_Host *instance) | |
1639 | { | |
1640 | unsigned long flags; | |
1641 | ||
1642 | local_irq_save(flags); | |
1643 | NCR5380_write(TARGET_COMMAND_REG, | |
1644 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1645 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1646 | udelay(50); | |
1647 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1648 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1649 | local_irq_restore(flags); | |
1650 | } | |
1651 | ||
80d3eb6d FT |
1652 | /** |
1653 | * do_abort - abort the currently established nexus by going to | |
1654 | * MESSAGE OUT phase and sending an ABORT message. | |
1655 | * @instance: relevant scsi host instance | |
c28bda25 | 1656 | * |
80d3eb6d | 1657 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1658 | */ |
1659 | ||
a53a21e4 | 1660 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1661 | { |
c28bda25 RZ |
1662 | unsigned char tmp, *msgptr, phase; |
1663 | int len; | |
80d3eb6d | 1664 | int rc; |
c28bda25 RZ |
1665 | |
1666 | /* Request message out phase */ | |
1da177e4 | 1667 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1668 | |
1669 | /* | |
1670 | * Wait for the target to indicate a valid phase by asserting | |
1671 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1672 | * and can immediately send the ABORT message, or we'll have some | |
1673 | * other phase and will have to source/sink data. | |
1674 | * | |
1675 | * We really don't care what value was on the bus or what value | |
1676 | * the target sees, so we just handshake. | |
1677 | */ | |
1678 | ||
80d3eb6d FT |
1679 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1680 | if (rc < 0) | |
1681 | goto timeout; | |
1682 | ||
1683 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1684 | |
1685 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1686 | ||
80d3eb6d FT |
1687 | if (tmp != PHASE_MSGOUT) { |
1688 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1689 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1690 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1691 | if (rc < 0) | |
1692 | goto timeout; | |
c28bda25 RZ |
1693 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1694 | } | |
1695 | ||
1696 | tmp = ABORT; | |
1697 | msgptr = &tmp; | |
1698 | len = 1; | |
1699 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1700 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1701 | |
1702 | /* | |
1703 | * If we got here, and the command completed successfully, | |
1704 | * we're about to go into bus free state. | |
1705 | */ | |
1706 | ||
1707 | return len ? -1 : 0; | |
80d3eb6d FT |
1708 | |
1709 | timeout: | |
1710 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1711 | return -1; | |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1715 | /* |
1716 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1717 | * unsigned char *phase, int *count, unsigned char **data) |
1718 | * | |
1719 | * Purpose : transfers data in given phase using either real | |
1720 | * or pseudo DMA. | |
1721 | * | |
c28bda25 RZ |
1722 | * Inputs : instance - instance of driver, *phase - pointer to |
1723 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1724 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1725 | * |
1da177e4 | 1726 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1727 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1728 | * is in same phase. |
1729 | * | |
c28bda25 | 1730 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1731 | * |
1732 | */ | |
1733 | ||
1734 | ||
c28bda25 RZ |
1735 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1736 | unsigned char *phase, int *count, | |
1737 | unsigned char **data) | |
1da177e4 | 1738 | { |
e8a60144 | 1739 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1740 | register int c = *count; |
1741 | register unsigned char p = *phase; | |
e3f463b0 FT |
1742 | |
1743 | #if defined(CONFIG_SUN3) | |
1744 | /* sanity check */ | |
1745 | if (!sun3_dma_setup_done) { | |
1746 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1747 | instance->host_no); | |
1748 | BUG(); | |
1749 | } | |
1750 | hostdata->dma_len = c; | |
1751 | ||
1752 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1753 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1754 | c, (p & SR_IO) ? "to" : "from", *data); | |
1755 | ||
1756 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1757 | |
1758 | /* send start chain */ | |
1759 | sun3scsi_dma_start(c, *data); | |
1760 | ||
cd400825 FT |
1761 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1762 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1763 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1764 | if (p & SR_IO) { |
e3f463b0 | 1765 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1766 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1767 | } else { | |
e3f463b0 | 1768 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1769 | NCR5380_write(START_DMA_SEND_REG, 0); |
1770 | } | |
1771 | ||
1772 | #ifdef SUN3_SCSI_VME | |
1773 | dregs->csr |= CSR_DMA_ENABLE; | |
1774 | #endif | |
1775 | ||
e3f463b0 FT |
1776 | sun3_dma_active = 1; |
1777 | ||
1778 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1779 | register unsigned char *d = *data; |
1780 | unsigned char tmp; | |
c28bda25 RZ |
1781 | |
1782 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1783 | *phase = tmp; | |
1784 | return -1; | |
1785 | } | |
1da177e4 | 1786 | |
ef1081cb FT |
1787 | if (hostdata->read_overruns && (p & SR_IO)) |
1788 | c -= hostdata->read_overruns; | |
1da177e4 | 1789 | |
d65e634a | 1790 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1791 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1792 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1793 | |
c28bda25 | 1794 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1795 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1796 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1797 | |
ef1081cb | 1798 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1799 | /* On the Medusa, it is a must to initialize the DMA before |
1800 | * starting the NCR. This is also the cleaner way for the TT. | |
1801 | */ | |
c28bda25 RZ |
1802 | hostdata->dma_len = (p & SR_IO) ? |
1803 | NCR5380_dma_read_setup(instance, d, c) : | |
1804 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1805 | } |
1806 | ||
1807 | if (p & SR_IO) | |
1808 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1809 | else { | |
1810 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1811 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1812 | } | |
1813 | ||
ef1081cb | 1814 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1815 | /* On the Falcon, the DMA setup must be done after the last */ |
1816 | /* NCR access, else the DMA setup gets trashed! | |
1817 | */ | |
c28bda25 RZ |
1818 | hostdata->dma_len = (p & SR_IO) ? |
1819 | NCR5380_dma_read_setup(instance, d, c) : | |
1820 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1821 | } |
e3f463b0 FT |
1822 | #endif /* !defined(CONFIG_SUN3) */ |
1823 | ||
c28bda25 | 1824 | return 0; |
1da177e4 LT |
1825 | } |
1826 | #endif /* defined(REAL_DMA) */ | |
1827 | ||
1828 | /* | |
1829 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1830 | * | |
c28bda25 RZ |
1831 | * Purpose : run through the various SCSI phases and do as the target |
1832 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1833 | * instance->connected. |
1834 | * | |
1835 | * Inputs : instance, instance for which we are doing commands | |
1836 | * | |
c28bda25 | 1837 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1838 | * modified if a command disconnects, *instance->connected will |
1839 | * change. | |
1840 | * | |
c28bda25 RZ |
1841 | * XXX Note : we need to watch for bus free or a reset condition here |
1842 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1843 | */ |
c28bda25 RZ |
1844 | |
1845 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1846 | { |
e8a60144 | 1847 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1848 | unsigned char msgout = NOP; |
1849 | int sink = 0; | |
1850 | int len; | |
1da177e4 | 1851 | #if defined(REAL_DMA) |
c28bda25 | 1852 | int transfersize; |
1da177e4 | 1853 | #endif |
c28bda25 RZ |
1854 | unsigned char *data; |
1855 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1856 | struct scsi_cmnd *cmd; |
c28bda25 | 1857 | |
e3f463b0 FT |
1858 | #ifdef SUN3_SCSI_VME |
1859 | dregs->csr |= CSR_INTR; | |
1860 | #endif | |
1861 | ||
11d2f63b | 1862 | while ((cmd = hostdata->connected)) { |
c28bda25 RZ |
1863 | tmp = NCR5380_read(STATUS_REG); |
1864 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1865 | if (tmp & SR_REQ) { | |
1866 | phase = (tmp & PHASE_MASK); | |
1867 | if (phase != old_phase) { | |
1868 | old_phase = phase; | |
8ad3a593 | 1869 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1870 | } |
e3f463b0 FT |
1871 | #if defined(CONFIG_SUN3) |
1872 | if (phase == PHASE_CMDOUT) { | |
1873 | #if defined(REAL_DMA) | |
1874 | void *d; | |
1875 | unsigned long count; | |
1876 | ||
1877 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1878 | count = cmd->SCp.buffer->length; | |
1879 | d = sg_virt(cmd->SCp.buffer); | |
1880 | } else { | |
1881 | count = cmd->SCp.this_residual; | |
1882 | d = cmd->SCp.ptr; | |
1883 | } | |
1884 | /* this command setup for dma yet? */ | |
1885 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1886 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
1887 | sun3scsi_dma_setup(d, count, | |
1888 | rq_data_dir(cmd->request)); | |
1889 | sun3_dma_setup_done = cmd; | |
1890 | } | |
1891 | } | |
1892 | #endif | |
1893 | #ifdef SUN3_SCSI_VME | |
1894 | dregs->csr |= CSR_INTR; | |
1895 | #endif | |
1896 | } | |
1897 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1898 | |
c28bda25 RZ |
1899 | if (sink && (phase != PHASE_MSGOUT)) { |
1900 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1901 | ||
1902 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1903 | ICR_ASSERT_ACK); | |
1904 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1905 | ; | |
1906 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1907 | ICR_ASSERT_ATN); | |
1908 | sink = 0; | |
1909 | continue; | |
1910 | } | |
1911 | ||
1912 | switch (phase) { | |
1913 | case PHASE_DATAOUT: | |
1da177e4 | 1914 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
1915 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
1916 | "aborted\n", HOSTNO); | |
1917 | sink = 1; | |
1918 | do_abort(instance); | |
1919 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1920 | cmd->scsi_done(cmd); |
c28bda25 | 1921 | return; |
1da177e4 | 1922 | #endif |
c28bda25 RZ |
1923 | case PHASE_DATAIN: |
1924 | /* | |
1925 | * If there is no room left in the current buffer in the | |
1926 | * scatter-gather list, move onto the next one. | |
1927 | */ | |
1928 | ||
1929 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1930 | ++cmd->SCp.buffer; | |
1931 | --cmd->SCp.buffers_residual; | |
1932 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1933 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1934 | /* ++roman: Try to merge some scatter-buffers if |
1935 | * they are at contiguous physical addresses. | |
1936 | */ | |
1937 | merge_contiguous_buffers(cmd); | |
d65e634a | 1938 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
1939 | HOSTNO, cmd->SCp.this_residual, |
1940 | cmd->SCp.buffers_residual); | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * The preferred transfer method is going to be | |
1945 | * PSEUDO-DMA for systems that are strictly PIO, | |
1946 | * since we can let the hardware do the handshaking. | |
1947 | * | |
1948 | * For this to work, we need to know the transfersize | |
1949 | * ahead of time, since the pseudo-DMA code will sit | |
1950 | * in an unconditional loop. | |
1951 | */ | |
1952 | ||
1953 | /* ++roman: I suggest, this should be | |
1954 | * #if def(REAL_DMA) | |
1955 | * instead of leaving REAL_DMA out. | |
1956 | */ | |
1da177e4 LT |
1957 | |
1958 | #if defined(REAL_DMA) | |
e3f463b0 | 1959 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1960 | transfersize = 0; |
1961 | if (!cmd->device->borken) | |
e3f463b0 | 1962 | #endif |
ff3d4578 FT |
1963 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1964 | ||
1965 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
1966 | len = transfersize; |
1967 | cmd->SCp.phase = phase; | |
1968 | if (NCR5380_transfer_dma(instance, &phase, | |
1969 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1970 | /* | |
1971 | * If the watchdog timer fires, all future | |
1972 | * accesses to this device will use the | |
1973 | * polled-IO. */ | |
ff50f9ed FT |
1974 | scmd_printk(KERN_INFO, cmd, |
1975 | "switching to slow handshake\n"); | |
c28bda25 | 1976 | cmd->device->borken = 1; |
c28bda25 RZ |
1977 | sink = 1; |
1978 | do_abort(instance); | |
1979 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1980 | cmd->scsi_done(cmd); |
c28bda25 RZ |
1981 | /* XXX - need to source or sink data here, as appropriate */ |
1982 | } else { | |
1da177e4 | 1983 | #ifdef REAL_DMA |
c28bda25 RZ |
1984 | /* ++roman: When using real DMA, |
1985 | * information_transfer() should return after | |
1986 | * starting DMA since it has nothing more to | |
1987 | * do. | |
1988 | */ | |
1989 | return; | |
1990 | #else | |
1991 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 1992 | #endif |
c28bda25 RZ |
1993 | } |
1994 | } else | |
1da177e4 | 1995 | #endif /* defined(REAL_DMA) */ |
11d2f63b FT |
1996 | { |
1997 | spin_unlock_irq(&hostdata->lock); | |
c28bda25 RZ |
1998 | NCR5380_transfer_pio(instance, &phase, |
1999 | (int *)&cmd->SCp.this_residual, | |
2000 | (unsigned char **)&cmd->SCp.ptr); | |
11d2f63b FT |
2001 | spin_lock_irq(&hostdata->lock); |
2002 | } | |
e3f463b0 FT |
2003 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2004 | /* if we had intended to dma that command clear it */ | |
2005 | if (sun3_dma_setup_done == cmd) | |
2006 | sun3_dma_setup_done = NULL; | |
2007 | #endif | |
c28bda25 RZ |
2008 | break; |
2009 | case PHASE_MSGIN: | |
2010 | len = 1; | |
2011 | data = &tmp; | |
c28bda25 RZ |
2012 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2013 | cmd->SCp.Message = tmp; | |
2014 | ||
2015 | switch (tmp) { | |
c28bda25 RZ |
2016 | case ABORT: |
2017 | case COMMAND_COMPLETE: | |
2018 | /* Accept message by clearing ACK */ | |
2019 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2020 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2021 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
e3c3da67 | 2022 | |
e3c3da67 | 2023 | hostdata->connected = NULL; |
1da177e4 | 2024 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2025 | cmd_free_tag(cmd); |
2026 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
61d739a4 | 2027 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 2028 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2029 | "QUEUE_FULL after %d commands\n", |
2030 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2031 | ta->nr_allocated); | |
2032 | if (ta->queue_size > ta->nr_allocated) | |
e42d0151 | 2033 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2034 | } |
1da177e4 | 2035 | #else |
c28bda25 | 2036 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2037 | #endif |
c28bda25 RZ |
2038 | |
2039 | /* | |
2040 | * I'm not sure what the correct thing to do here is : | |
2041 | * | |
2042 | * If the command that just executed is NOT a request | |
2043 | * sense, the obvious thing to do is to set the result | |
2044 | * code to the values of the stored parameters. | |
2045 | * | |
2046 | * If it was a REQUEST SENSE command, we need some way to | |
2047 | * differentiate between the failure code of the original | |
2048 | * and the failure code of the REQUEST sense - the obvious | |
2049 | * case is success, where we fall through and leave the | |
2050 | * result code unchanged. | |
2051 | * | |
2052 | * The non-obvious place is where the REQUEST SENSE failed | |
2053 | */ | |
2054 | ||
2055 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2056 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2057 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2058 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2059 | |
28424d3a BH |
2060 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2061 | hostdata->ses.cmd_len) { | |
2062 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2063 | hostdata->ses.cmd_len = 0 ; | |
2064 | } | |
2065 | ||
c28bda25 RZ |
2066 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2067 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2068 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2069 | ||
d65e634a | 2070 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 | 2071 | |
c28bda25 | 2072 | LIST(cmd,hostdata->issue_queue); |
3130d905 | 2073 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2074 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
dbb6b350 FT |
2075 | dsprintk(NDEBUG_QUEUES, instance, |
2076 | "REQUEST SENSE cmd %p added to head of issue queue\n", | |
2077 | cmd); | |
997acab7 | 2078 | } else { |
c28bda25 RZ |
2079 | cmd->scsi_done(cmd); |
2080 | } | |
2081 | ||
c28bda25 RZ |
2082 | /* |
2083 | * Restore phase bits to 0 so an interrupted selection, | |
2084 | * arbitration can resume. | |
2085 | */ | |
2086 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2087 | ||
72064a78 FT |
2088 | /* Enable reselect interrupts */ |
2089 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2090 | ||
c28bda25 RZ |
2091 | /* ++roman: For Falcon SCSI, release the lock on the |
2092 | * ST-DMA here if no other commands are waiting on the | |
2093 | * disconnected queue. | |
2094 | */ | |
e3c3da67 | 2095 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2096 | return; |
2097 | case MESSAGE_REJECT: | |
2098 | /* Accept message by clearing ACK */ | |
2099 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2100 | switch (hostdata->last_message) { |
2101 | case HEAD_OF_QUEUE_TAG: | |
2102 | case ORDERED_QUEUE_TAG: | |
2103 | case SIMPLE_QUEUE_TAG: | |
2104 | /* The target obviously doesn't support tagged | |
2105 | * queuing, even though it announced this ability in | |
2106 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2107 | * clear 'tagged_supported' and lock the LUN, since | |
2108 | * the command is treated as untagged further on. | |
2109 | */ | |
2110 | cmd->device->tagged_supported = 0; | |
2111 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2112 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2113 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2114 | "QUEUE_TAG message; tagged queuing " |
2115 | "disabled\n", | |
2116 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2117 | break; | |
2118 | } | |
2119 | break; | |
2120 | case DISCONNECT: | |
2121 | /* Accept message by clearing ACK */ | |
2122 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 | 2123 | LIST(cmd,hostdata->disconnected_queue); |
3130d905 | 2124 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2125 | hostdata->connected = NULL; |
2126 | hostdata->disconnected_queue = cmd; | |
9cb78c16 | 2127 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2128 | "moved from connected to the " |
2129 | "disconnected_queue\n", HOSTNO, | |
2130 | cmd->device->id, cmd->device->lun); | |
2131 | /* | |
2132 | * Restore phase bits to 0 so an interrupted selection, | |
2133 | * arbitration can resume. | |
2134 | */ | |
2135 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2136 | ||
2137 | /* Enable reselect interrupts */ | |
2138 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2139 | #ifdef SUN3_SCSI_VME |
2140 | dregs->csr |= CSR_DMA_ENABLE; | |
2141 | #endif | |
c28bda25 RZ |
2142 | return; |
2143 | /* | |
2144 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2145 | * operation, in violation of the SCSI spec so we can safely | |
2146 | * ignore SAVE/RESTORE pointers calls. | |
2147 | * | |
2148 | * Unfortunately, some disks violate the SCSI spec and | |
2149 | * don't issue the required SAVE_POINTERS message before | |
2150 | * disconnecting, and we have to break spec to remain | |
2151 | * compatible. | |
2152 | */ | |
2153 | case SAVE_POINTERS: | |
2154 | case RESTORE_POINTERS: | |
2155 | /* Accept message by clearing ACK */ | |
2156 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2157 | break; |
2158 | case EXTENDED_MESSAGE: | |
2159 | /* | |
2160 | * Extended messages are sent in the following format : | |
2161 | * Byte | |
2162 | * 0 EXTENDED_MESSAGE == 1 | |
2163 | * 1 length (includes one byte for code, doesn't | |
2164 | * include first two bytes) | |
2165 | * 2 code | |
2166 | * 3..length+1 arguments | |
2167 | * | |
2168 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2169 | * byte, since spi_print_msg() wants the whole thing. | |
2170 | */ | |
2171 | extended_msg[0] = EXTENDED_MESSAGE; | |
2172 | /* Accept first byte by clearing ACK */ | |
2173 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2174 | ||
11d2f63b FT |
2175 | spin_unlock_irq(&hostdata->lock); |
2176 | ||
d65e634a | 2177 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2178 | |
2179 | len = 2; | |
2180 | data = extended_msg + 1; | |
2181 | phase = PHASE_MSGIN; | |
2182 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2183 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2184 | (int)extended_msg[1], (int)extended_msg[2]); |
2185 | ||
e0783ed3 FT |
2186 | if (!len && extended_msg[1] > 0 && |
2187 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2188 | /* Accept third byte by clearing ACK */ |
2189 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2190 | len = extended_msg[1] - 1; | |
2191 | data = extended_msg + 3; | |
2192 | phase = PHASE_MSGIN; | |
2193 | ||
2194 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2195 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2196 | HOSTNO, len); |
2197 | ||
2198 | switch (extended_msg[2]) { | |
2199 | case EXTENDED_SDTR: | |
2200 | case EXTENDED_WDTR: | |
2201 | case EXTENDED_MODIFY_DATA_POINTER: | |
2202 | case EXTENDED_EXTENDED_IDENTIFY: | |
2203 | tmp = 0; | |
2204 | } | |
2205 | } else if (len) { | |
2206 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2207 | "extended message\n", HOSTNO); | |
2208 | tmp = 0; | |
2209 | } else { | |
2210 | printk(KERN_NOTICE "scsi%d: extended message " | |
2211 | "code %02x length %d is too long\n", | |
2212 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2213 | tmp = 0; | |
2214 | } | |
11d2f63b FT |
2215 | |
2216 | spin_lock_irq(&hostdata->lock); | |
2217 | if (!hostdata->connected) | |
2218 | return; | |
2219 | ||
c28bda25 RZ |
2220 | /* Fall through to reject message */ |
2221 | ||
2222 | /* | |
2223 | * If we get something weird that we aren't expecting, | |
2224 | * reject it. | |
2225 | */ | |
2226 | default: | |
2227 | if (!tmp) { | |
ff50f9ed FT |
2228 | printk(KERN_INFO "scsi%d: rejecting message ", |
2229 | instance->host_no); | |
c28bda25 RZ |
2230 | spi_print_msg(extended_msg); |
2231 | printk("\n"); | |
2232 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2233 | scmd_printk(KERN_INFO, cmd, |
2234 | "rejecting unknown message %02x\n", | |
2235 | tmp); | |
c28bda25 | 2236 | else |
ff50f9ed FT |
2237 | scmd_printk(KERN_INFO, cmd, |
2238 | "rejecting unknown extended message code %02x, length %d\n", | |
2239 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2240 | |
2241 | msgout = MESSAGE_REJECT; | |
2242 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2243 | break; | |
2244 | } /* switch (tmp) */ | |
2245 | break; | |
2246 | case PHASE_MSGOUT: | |
2247 | len = 1; | |
2248 | data = &msgout; | |
2249 | hostdata->last_message = msgout; | |
2250 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2251 | if (msgout == ABORT) { | |
1da177e4 | 2252 | #ifdef SUPPORT_TAGS |
c28bda25 | 2253 | cmd_free_tag(cmd); |
1da177e4 | 2254 | #else |
c28bda25 | 2255 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2256 | #endif |
c28bda25 RZ |
2257 | hostdata->connected = NULL; |
2258 | cmd->result = DID_ERROR << 16; | |
e3c3da67 | 2259 | maybe_release_dma_irq(instance); |
e3c3da67 | 2260 | cmd->scsi_done(cmd); |
cd400825 | 2261 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2262 | return; |
2263 | } | |
2264 | msgout = NOP; | |
2265 | break; | |
2266 | case PHASE_CMDOUT: | |
2267 | len = cmd->cmd_len; | |
2268 | data = cmd->cmnd; | |
2269 | /* | |
2270 | * XXX for performance reasons, on machines with a | |
2271 | * PSEUDO-DMA architecture we should probably | |
2272 | * use the dma transfer function. | |
2273 | */ | |
2274 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2275 | break; | |
2276 | case PHASE_STATIN: | |
2277 | len = 1; | |
2278 | data = &tmp; | |
2279 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2280 | cmd->SCp.Status = tmp; | |
2281 | break; | |
2282 | default: | |
2283 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2284 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2285 | } /* switch(phase) */ |
686f3990 | 2286 | } else { |
11d2f63b | 2287 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2288 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2289 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2290 | } |
11d2f63b | 2291 | } |
1da177e4 LT |
2292 | } |
2293 | ||
2294 | /* | |
2295 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2296 | * | |
c28bda25 | 2297 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2298 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2299 | * nexus has been reestablished, |
c28bda25 | 2300 | * |
1da177e4 LT |
2301 | * Inputs : instance - this instance of the NCR5380. |
2302 | * | |
2303 | */ | |
2304 | ||
2305 | ||
e3f463b0 FT |
2306 | /* it might eventually prove necessary to do a dma setup on |
2307 | reselection, but it doesn't seem to be needed now -- sam */ | |
2308 | ||
c28bda25 | 2309 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2310 | { |
e8a60144 | 2311 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2312 | unsigned char target_mask; |
e3f463b0 | 2313 | unsigned char lun; |
1da177e4 | 2314 | #ifdef SUPPORT_TAGS |
c28bda25 | 2315 | unsigned char tag; |
1da177e4 | 2316 | #endif |
c28bda25 | 2317 | unsigned char msg[3]; |
e3f463b0 FT |
2318 | int __maybe_unused len; |
2319 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2320 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2321 | |
2322 | /* | |
2323 | * Disable arbitration, etc. since the host adapter obviously | |
2324 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2325 | */ | |
2326 | ||
2327 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2328 | |
2329 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2330 | ||
d65e634a | 2331 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2332 | |
2333 | /* | |
2334 | * At this point, we have detected that our SCSI ID is on the bus, | |
2335 | * SEL is true and BSY was false for at least one bus settle delay | |
2336 | * (400 ns). | |
2337 | * | |
2338 | * We must assert BSY ourselves, until the target drops the SEL | |
2339 | * signal. | |
2340 | */ | |
2341 | ||
2342 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2343 | if (NCR5380_poll_politely(instance, |
2344 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2345 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2346 | return; | |
2347 | } | |
c28bda25 RZ |
2348 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2349 | ||
2350 | /* | |
2351 | * Wait for target to go into MSGIN. | |
2352 | */ | |
2353 | ||
72064a78 FT |
2354 | if (NCR5380_poll_politely(instance, |
2355 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2356 | do_abort(instance); | |
2357 | return; | |
2358 | } | |
c28bda25 | 2359 | |
e3f463b0 FT |
2360 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2361 | /* acknowledge toggle to MSGIN */ | |
2362 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2363 | ||
2364 | /* peek at the byte without really hitting the bus */ | |
2365 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2366 | #else | |
c28bda25 RZ |
2367 | len = 1; |
2368 | data = msg; | |
2369 | phase = PHASE_MSGIN; | |
2370 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2371 | |
2372 | if (len) { | |
2373 | do_abort(instance); | |
2374 | return; | |
2375 | } | |
e3f463b0 | 2376 | #endif |
c28bda25 RZ |
2377 | |
2378 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2379 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2380 | spi_print_msg(msg); |
72064a78 | 2381 | printk("\n"); |
c28bda25 RZ |
2382 | do_abort(instance); |
2383 | return; | |
2384 | } | |
72064a78 | 2385 | lun = msg[0] & 0x07; |
1da177e4 | 2386 | |
e3f463b0 | 2387 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2388 | /* If the phase is still MSGIN, the target wants to send some more |
2389 | * messages. In case it supports tagged queuing, this is probably a | |
2390 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2391 | */ | |
2392 | tag = TAG_NONE; | |
ca513fc9 | 2393 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2394 | /* Accept previous IDENTIFY message by clearing ACK */ |
2395 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2396 | len = 2; | |
2397 | data = msg + 1; | |
2398 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2399 | msg[1] == SIMPLE_QUEUE_TAG) | |
2400 | tag = msg[2]; | |
d65e634a | 2401 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2402 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2403 | } | |
1da177e4 | 2404 | #endif |
c28bda25 RZ |
2405 | |
2406 | /* | |
2407 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2408 | * just reestablished, and remove it from the disconnected queue. | |
2409 | */ | |
2410 | ||
710ddd0d | 2411 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 | 2412 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
72064a78 | 2413 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 | 2414 | #ifdef SUPPORT_TAGS |
c28bda25 | 2415 | && (tag == tmp->tag) |
1da177e4 | 2416 | #endif |
c28bda25 | 2417 | ) { |
c28bda25 RZ |
2418 | if (prev) { |
2419 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2420 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2421 | } else { |
2422 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2423 | hostdata->disconnected_queue = NEXT(tmp); | |
2424 | } | |
3130d905 | 2425 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2426 | break; |
2427 | } | |
1da177e4 | 2428 | } |
c28bda25 RZ |
2429 | |
2430 | if (!tmp) { | |
1da177e4 | 2431 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2432 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2433 | target_mask, lun, tag); | |
2434 | #else | |
2435 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2436 | target_mask, lun); | |
1da177e4 | 2437 | #endif |
c28bda25 RZ |
2438 | /* |
2439 | * Since we have an established nexus that we can't do anything | |
2440 | * with, we must abort it. | |
2441 | */ | |
2442 | do_abort(instance); | |
2443 | return; | |
2444 | } | |
1da177e4 | 2445 | |
e3f463b0 FT |
2446 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2447 | /* engage dma setup for the command we just saw */ | |
2448 | { | |
2449 | void *d; | |
2450 | unsigned long count; | |
2451 | ||
2452 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2453 | count = tmp->SCp.buffer->length; | |
2454 | d = sg_virt(tmp->SCp.buffer); | |
2455 | } else { | |
2456 | count = tmp->SCp.this_residual; | |
2457 | d = tmp->SCp.ptr; | |
2458 | } | |
2459 | /* setup this command for dma if not already */ | |
2460 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2461 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2462 | sun3_dma_setup_done = tmp; | |
2463 | } | |
2464 | } | |
2465 | ||
2466 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2467 | #endif | |
2468 | ||
c28bda25 RZ |
2469 | /* Accept message by clearing ACK */ |
2470 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2471 | |
e3f463b0 FT |
2472 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2473 | /* If the phase is still MSGIN, the target wants to send some more | |
2474 | * messages. In case it supports tagged queuing, this is probably a | |
2475 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2476 | */ | |
2477 | tag = TAG_NONE; | |
2478 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2479 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2480 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2481 | len = 2; | |
2482 | data = msg + 1; | |
2483 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2484 | msg[1] == SIMPLE_QUEUE_TAG) | |
2485 | tag = msg[2]; | |
2486 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2487 | HOSTNO, target_mask, lun, tag); | |
2488 | } | |
2489 | #endif | |
2490 | ||
c28bda25 | 2491 | hostdata->connected = tmp; |
9cb78c16 | 2492 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2493 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2494 | } |
2495 | ||
2496 | ||
2497 | /* | |
710ddd0d | 2498 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2499 | * |
2500 | * Purpose : abort a command | |
2501 | * | |
710ddd0d | 2502 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2503 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2504 | * used. |
2505 | * | |
b6c92b7e | 2506 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2507 | * |
c28bda25 RZ |
2508 | * XXX - there is no way to abort the command that is currently |
2509 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2510 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2511 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2512 | */ |
2513 | ||
2514 | static | |
710ddd0d | 2515 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2516 | { |
c28bda25 | 2517 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2518 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 2519 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2520 | unsigned long flags; |
1da177e4 | 2521 | |
1fa6b5fb | 2522 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2523 | |
11d2f63b | 2524 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2525 | |
e5c3fddf FT |
2526 | NCR5380_dprint(NDEBUG_ANY, instance); |
2527 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2528 | |
d65e634a | 2529 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2530 | NCR5380_read(BUS_AND_STATUS_REG), |
2531 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2532 | |
2533 | #if 1 | |
c28bda25 RZ |
2534 | /* |
2535 | * Case 1 : If the command is the currently executing command, | |
2536 | * we'll set the aborted flag and return control so that | |
2537 | * information transfer routine can exit cleanly. | |
2538 | */ | |
1da177e4 | 2539 | |
c28bda25 | 2540 | if (hostdata->connected == cmd) { |
1da177e4 | 2541 | |
d65e634a | 2542 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2543 | /* |
2544 | * We should perform BSY checking, and make sure we haven't slipped | |
2545 | * into BUS FREE. | |
2546 | */ | |
1da177e4 | 2547 | |
c28bda25 RZ |
2548 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2549 | /* | |
2550 | * Since we can't change phases until we've completed the current | |
2551 | * handshake, we have to source or sink a byte of data if the current | |
2552 | * phase is not MSGOUT. | |
2553 | */ | |
1da177e4 | 2554 | |
c28bda25 RZ |
2555 | /* |
2556 | * Return control to the executing NCR drive so we can clear the | |
2557 | * aborted flag and get back into our main loop. | |
2558 | */ | |
1da177e4 | 2559 | |
c28bda25 | 2560 | if (do_abort(instance) == 0) { |
c28bda25 RZ |
2561 | hostdata->connected = NULL; |
2562 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2563 | #ifdef SUPPORT_TAGS |
c28bda25 | 2564 | cmd_free_tag(cmd); |
1da177e4 | 2565 | #else |
c28bda25 | 2566 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2567 | #endif |
e3c3da67 | 2568 | maybe_release_dma_irq(instance); |
11d2f63b | 2569 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2570 | cmd->scsi_done(cmd); |
2b0f834c | 2571 | return SUCCESS; |
c28bda25 | 2572 | } else { |
11d2f63b | 2573 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2574 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2575 | return FAILED; |
c28bda25 RZ |
2576 | } |
2577 | } | |
1da177e4 LT |
2578 | #endif |
2579 | ||
c28bda25 RZ |
2580 | /* |
2581 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2582 | * from the issue queue. | |
2583 | */ | |
710ddd0d FT |
2584 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2585 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2586 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2587 | if (cmd == tmp) { | |
2588 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2589 | (*prev) = NEXT(tmp); | |
3130d905 | 2590 | SET_NEXT(tmp, NULL); |
c28bda25 | 2591 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2592 | maybe_release_dma_irq(instance); |
11d2f63b | 2593 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2594 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2595 | HOSTNO); |
2596 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2597 | * yet... */ | |
2598 | tmp->scsi_done(tmp); | |
2b0f834c | 2599 | return SUCCESS; |
c28bda25 | 2600 | } |
1da177e4 LT |
2601 | } |
2602 | ||
c28bda25 RZ |
2603 | /* |
2604 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2605 | * and let the high level SCSI driver retry at a later time or | |
2606 | * issue a reset. | |
2607 | * | |
2608 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2609 | * and handling them cleanly in this situation would make the common | |
2610 | * case of noresets less efficient, and would pollute our code. So, | |
2611 | * we fail. | |
2612 | */ | |
1da177e4 | 2613 | |
c28bda25 | 2614 | if (hostdata->connected) { |
11d2f63b | 2615 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2616 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2617 | return FAILED; |
c28bda25 | 2618 | } |
1da177e4 | 2619 | |
c28bda25 RZ |
2620 | /* |
2621 | * Case 4: If the command is currently disconnected from the bus, and | |
2622 | * there are no connected commands, we reconnect the I_T_L or | |
2623 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2624 | * an abort message. | |
2625 | * | |
2626 | * This case is especially ugly. In order to reestablish the nexus, we | |
2627 | * need to call NCR5380_select(). The easiest way to implement this | |
2628 | * function was to abort if the bus was busy, and let the interrupt | |
2629 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2630 | * where necessary, meaning interrupts need to be enabled. | |
2631 | * | |
2632 | * When interrupts are enabled, the queues may change - so we | |
2633 | * can't remove it from the disconnected queue before selecting it | |
2634 | * because that could cause a failure in hashing the nexus if that | |
2635 | * device reselected. | |
2636 | * | |
2637 | * Since the queues may change, we can't use the pointers from when we | |
2638 | * first locate it. | |
2639 | * | |
2640 | * So, we must first locate the command, and if NCR5380_select() | |
2641 | * succeeds, then issue the abort, relocate the command and remove | |
2642 | * it from the disconnected queue. | |
2643 | */ | |
2644 | ||
710ddd0d | 2645 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2646 | tmp = NEXT(tmp)) { |
2647 | if (cmd == tmp) { | |
d65e634a | 2648 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2649 | |
11d2f63b FT |
2650 | if (NCR5380_select(instance, cmd)) { |
2651 | spin_unlock_irq(&hostdata->lock); | |
2b0f834c | 2652 | return FAILED; |
11d2f63b | 2653 | } |
d65e634a | 2654 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2655 | |
2656 | do_abort(instance); | |
2657 | ||
710ddd0d FT |
2658 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2659 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2660 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2661 | if (cmd == tmp) { | |
2662 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2663 | *prev = NEXT(tmp); | |
3130d905 | 2664 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2665 | tmp->result = DID_ABORT << 16; |
2666 | /* We must unlock the tag/LUN immediately here, since the | |
2667 | * target goes to BUS FREE and doesn't send us another | |
2668 | * message (COMMAND_COMPLETE or the like) | |
2669 | */ | |
1da177e4 | 2670 | #ifdef SUPPORT_TAGS |
c28bda25 | 2671 | cmd_free_tag(tmp); |
1da177e4 | 2672 | #else |
c28bda25 | 2673 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2674 | #endif |
e3c3da67 | 2675 | maybe_release_dma_irq(instance); |
11d2f63b | 2676 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2677 | tmp->scsi_done(tmp); |
2b0f834c | 2678 | return SUCCESS; |
c28bda25 RZ |
2679 | } |
2680 | } | |
1da177e4 LT |
2681 | } |
2682 | } | |
2683 | ||
e3c3da67 FT |
2684 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2685 | * possible at all) At least, we should check if the lock could be | |
2686 | * released after the abort, in case it is kept due to some bug. | |
2687 | */ | |
2688 | maybe_release_dma_irq(instance); | |
11d2f63b | 2689 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2690 | |
c28bda25 RZ |
2691 | /* |
2692 | * Case 5 : If we reached this point, the command was not found in any of | |
2693 | * the queues. | |
2694 | * | |
2695 | * We probably reached this point because of an unlikely race condition | |
2696 | * between the command completing successfully and the abortion code, | |
2697 | * so we won't panic, but we will notify the user in case something really | |
2698 | * broke. | |
2699 | */ | |
1da177e4 | 2700 | |
ad361c98 | 2701 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2702 | |
2b0f834c | 2703 | return FAILED; |
1da177e4 LT |
2704 | } |
2705 | ||
2706 | ||
3be1b3ea FT |
2707 | /** |
2708 | * NCR5380_bus_reset - reset the SCSI bus | |
2709 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2710 | * |
3be1b3ea | 2711 | * Returns SUCCESS |
c28bda25 | 2712 | */ |
1da177e4 | 2713 | |
710ddd0d | 2714 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2715 | { |
e3c3da67 FT |
2716 | struct Scsi_Host *instance = cmd->device->host; |
2717 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2718 | int i; |
2719 | unsigned long flags; | |
1da177e4 | 2720 | |
11d2f63b | 2721 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2722 | |
2723 | #if (NDEBUG & NDEBUG_ANY) | |
2724 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
3be1b3ea | 2725 | #endif |
e5c3fddf FT |
2726 | NCR5380_dprint(NDEBUG_ANY, instance); |
2727 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2728 | |
2729 | do_reset(instance); | |
c28bda25 | 2730 | |
c28bda25 | 2731 | /* reset NCR registers */ |
c28bda25 RZ |
2732 | NCR5380_write(MODE_REG, MR_BASE); |
2733 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2734 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2735 | |
c28bda25 RZ |
2736 | /* After the reset, there are no more connected or disconnected commands |
2737 | * and no busy units; so clear the low-level status here to avoid | |
2738 | * conflicts when the mid-level code tries to wake up the affected | |
2739 | * commands! | |
2740 | */ | |
2741 | ||
2742 | if (hostdata->issue_queue) | |
dbb6b350 | 2743 | dsprintk(NDEBUG_ABORT, instance, "reset aborted issued command(s)\n"); |
c28bda25 | 2744 | if (hostdata->connected) |
dbb6b350 | 2745 | dsprintk(NDEBUG_ABORT, instance, "reset aborted a connected command\n"); |
c28bda25 | 2746 | if (hostdata->disconnected_queue) |
dbb6b350 | 2747 | dsprintk(NDEBUG_ABORT, instance, "reset aborted disconnected command(s)\n"); |
c28bda25 | 2748 | |
c28bda25 RZ |
2749 | hostdata->issue_queue = NULL; |
2750 | hostdata->connected = NULL; | |
2751 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2752 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2753 | free_all_tags(hostdata); |
1da177e4 | 2754 | #endif |
c28bda25 RZ |
2755 | for (i = 0; i < 8; ++i) |
2756 | hostdata->busy[i] = 0; | |
1da177e4 | 2757 | #ifdef REAL_DMA |
c28bda25 | 2758 | hostdata->dma_len = 0; |
1da177e4 | 2759 | #endif |
e3c3da67 FT |
2760 | |
2761 | maybe_release_dma_irq(instance); | |
11d2f63b | 2762 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2763 | |
2b0f834c | 2764 | return SUCCESS; |
1da177e4 | 2765 | } |