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 | ||
1da177e4 LT |
199 | /* Macros ease life... :-) */ |
200 | #define SETUP_HOSTDATA(in) \ | |
201 | struct NCR5380_hostdata *hostdata = \ | |
202 | (struct NCR5380_hostdata *)(in)->hostdata | |
203 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
204 | ||
710ddd0d | 205 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 206 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 207 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
208 | |
209 | #define HOSTNO instance->host_no | |
1da177e4 | 210 | |
636b1ec8 FT |
211 | static int do_abort(struct Scsi_Host *); |
212 | static void do_reset(struct Scsi_Host *); | |
213 | ||
1da177e4 LT |
214 | #ifdef SUPPORT_TAGS |
215 | ||
216 | /* | |
217 | * Functions for handling tagged queuing | |
218 | * ===================================== | |
219 | * | |
220 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
221 | * | |
222 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
223 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
224 | * command has been preempted for a long time. My solution: a bitfield for | |
225 | * remembering used tags. | |
226 | * | |
227 | * There's also the problem that each target has a certain queue size, but we | |
228 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
229 | * returned. So, in this case, the driver internal queue size assumption is | |
230 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 231 | * target. |
1da177e4 LT |
232 | * |
233 | * We're also not allowed running tagged commands as long as an untagged | |
234 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
235 | * condition _must_ be untagged. To keep track whether an untagged command has | |
236 | * been issued, the host->busy array is still employed, as it is without | |
237 | * support for tagged queuing. | |
238 | * | |
239 | * One could suspect that there are possible race conditions between | |
240 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
241 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
242 | * which already guaranteed to be running at most once. It is also the only | |
243 | * place where tags/LUNs are allocated. So no other allocation can slip | |
244 | * between that pair, there could only happen a reselection, which can free a | |
245 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
246 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
247 | */ | |
248 | ||
ca513fc9 | 249 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 250 | { |
c28bda25 | 251 | int target, lun; |
61d739a4 | 252 | struct tag_alloc *ta; |
c28bda25 | 253 | |
ca513fc9 | 254 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
255 | return; |
256 | ||
257 | for (target = 0; target < 8; ++target) { | |
258 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 259 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
260 | bitmap_zero(ta->allocated, MAX_TAGS); |
261 | ta->nr_allocated = 0; | |
262 | /* At the beginning, assume the maximum queue size we could | |
263 | * support (MAX_TAGS). This value will be decreased if the target | |
264 | * returns QUEUE_FULL status. | |
265 | */ | |
266 | ta->queue_size = MAX_TAGS; | |
267 | } | |
1da177e4 | 268 | } |
1da177e4 LT |
269 | } |
270 | ||
271 | ||
272 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
273 | * busy by an untagged command. If the command should use tagged queuing, also | |
274 | * check that there is a free tag and the target's queue won't overflow. This | |
275 | * function should be called with interrupts disabled to avoid race | |
276 | * conditions. | |
c28bda25 | 277 | */ |
1da177e4 | 278 | |
710ddd0d | 279 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 280 | { |
9cb78c16 | 281 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
282 | struct Scsi_Host *instance = cmd->device->host; |
283 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 284 | |
9cb78c16 | 285 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
286 | return 1; |
287 | if (!should_be_tagged || | |
ca513fc9 FT |
288 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
289 | !cmd->device->tagged_supported) | |
c28bda25 | 290 | return 0; |
61d739a4 FT |
291 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
292 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
293 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
294 | scmd_id(cmd), lun); | |
c28bda25 RZ |
295 | return 1; |
296 | } | |
297 | return 0; | |
1da177e4 LT |
298 | } |
299 | ||
300 | ||
301 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
302 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
303 | * untagged. | |
304 | */ | |
305 | ||
710ddd0d | 306 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 307 | { |
9cb78c16 | 308 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
309 | struct Scsi_Host *instance = cmd->device->host; |
310 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
311 | |
312 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
313 | * an untagged command. | |
314 | */ | |
315 | if (!should_be_tagged || | |
ca513fc9 FT |
316 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
317 | !cmd->device->tagged_supported) { | |
c28bda25 | 318 | cmd->tag = TAG_NONE; |
9cb78c16 | 319 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
320 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
321 | scmd_id(cmd), lun); | |
c28bda25 | 322 | } else { |
61d739a4 | 323 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
324 | |
325 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
326 | set_bit(cmd->tag, ta->allocated); | |
327 | ta->nr_allocated++; | |
dbb6b350 FT |
328 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
329 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 330 | } |
1da177e4 LT |
331 | } |
332 | ||
333 | ||
334 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
335 | * unlock the LUN. | |
336 | */ | |
337 | ||
710ddd0d | 338 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 339 | { |
9cb78c16 | 340 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
341 | struct Scsi_Host *instance = cmd->device->host; |
342 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
343 | |
344 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 345 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
346 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
347 | scmd_id(cmd), lun); | |
c28bda25 | 348 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
349 | shost_printk(KERN_NOTICE, instance, |
350 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 351 | } else { |
61d739a4 | 352 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
353 | clear_bit(cmd->tag, ta->allocated); |
354 | ta->nr_allocated--; | |
dbb6b350 FT |
355 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
356 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 357 | } |
1da177e4 LT |
358 | } |
359 | ||
360 | ||
ca513fc9 | 361 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 362 | { |
c28bda25 | 363 | int target, lun; |
61d739a4 | 364 | struct tag_alloc *ta; |
c28bda25 | 365 | |
ca513fc9 | 366 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
367 | return; |
368 | ||
369 | for (target = 0; target < 8; ++target) { | |
370 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 371 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
372 | bitmap_zero(ta->allocated, MAX_TAGS); |
373 | ta->nr_allocated = 0; | |
374 | } | |
1da177e4 | 375 | } |
1da177e4 LT |
376 | } |
377 | ||
378 | #endif /* SUPPORT_TAGS */ | |
379 | ||
380 | ||
381 | /* | |
710ddd0d | 382 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
383 | * |
384 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
385 | * transfer. This is possible if the scatter buffers lie on | |
386 | * physical contiguous addresses. | |
387 | * | |
710ddd0d | 388 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 389 | * The command to work on. The first scatter buffer's data are |
25985edc | 390 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
391 | */ |
392 | ||
710ddd0d | 393 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 394 | { |
e3f463b0 | 395 | #if !defined(CONFIG_SUN3) |
c28bda25 | 396 | unsigned long endaddr; |
1da177e4 | 397 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
398 | unsigned long oldlen = cmd->SCp.this_residual; |
399 | int cnt = 1; | |
1da177e4 LT |
400 | #endif |
401 | ||
c28bda25 RZ |
402 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
403 | cmd->SCp.buffers_residual && | |
5a1cb47f | 404 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 405 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 406 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 407 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 408 | ++cnt; |
1da177e4 | 409 | #endif |
c28bda25 RZ |
410 | ++cmd->SCp.buffer; |
411 | --cmd->SCp.buffers_residual; | |
412 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
413 | endaddr += cmd->SCp.buffer->length; | |
414 | } | |
1da177e4 | 415 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 416 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 417 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 418 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 419 | #endif |
e3f463b0 | 420 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
421 | } |
422 | ||
ff50f9ed FT |
423 | /** |
424 | * initialize_SCp - init the scsi pointer field | |
425 | * @cmd: command block to set up | |
1da177e4 | 426 | * |
ff50f9ed | 427 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
428 | */ |
429 | ||
710ddd0d | 430 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 431 | { |
c28bda25 RZ |
432 | /* |
433 | * Initialize the Scsi Pointer field so that all of the commands in the | |
434 | * various queues are valid. | |
1da177e4 | 435 | */ |
c28bda25 | 436 | |
9e0fe44d BH |
437 | if (scsi_bufflen(cmd)) { |
438 | cmd->SCp.buffer = scsi_sglist(cmd); | |
439 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 440 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
441 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
442 | /* ++roman: Try to merge some scatter-buffers if they are at | |
443 | * contiguous physical addresses. | |
444 | */ | |
445 | merge_contiguous_buffers(cmd); | |
446 | } else { | |
447 | cmd->SCp.buffer = NULL; | |
448 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
449 | cmd->SCp.ptr = NULL; |
450 | cmd->SCp.this_residual = 0; | |
c28bda25 | 451 | } |
1da177e4 LT |
452 | } |
453 | ||
636b1ec8 | 454 | /** |
b32ade12 | 455 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 456 | * @instance: controller to poll |
b32ade12 FT |
457 | * @reg1: 5380 register to poll |
458 | * @bit1: Bitmask to check | |
459 | * @val1: Expected value | |
460 | * @reg2: Second 5380 register to poll | |
461 | * @bit2: Second bitmask to check | |
462 | * @val2: Second expected value | |
2f854b82 | 463 | * @wait: Time-out in jiffies |
636b1ec8 | 464 | * |
2f854b82 FT |
465 | * Polls the chip in a reasonably efficient manner waiting for an |
466 | * event to occur. After a short quick poll we begin to yield the CPU | |
467 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
468 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 469 | * |
b32ade12 | 470 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
471 | */ |
472 | ||
b32ade12 FT |
473 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
474 | int reg1, int bit1, int val1, | |
475 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 476 | { |
2f854b82 FT |
477 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
478 | unsigned long deadline = jiffies + wait; | |
479 | unsigned long n; | |
480 | ||
481 | /* Busy-wait for up to 10 ms */ | |
482 | n = min(10000U, jiffies_to_usecs(wait)); | |
483 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 484 | n /= 2000; |
2f854b82 | 485 | do { |
b32ade12 FT |
486 | if ((NCR5380_read(reg1) & bit1) == val1) |
487 | return 0; | |
488 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
489 | return 0; |
490 | cpu_relax(); | |
2f854b82 FT |
491 | } while (n--); |
492 | ||
493 | if (irqs_disabled() || in_interrupt()) | |
494 | return -ETIMEDOUT; | |
636b1ec8 | 495 | |
2f854b82 FT |
496 | /* Repeatedly sleep for 1 ms until deadline */ |
497 | while (time_is_after_jiffies(deadline)) { | |
498 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
499 | if ((NCR5380_read(reg1) & bit1) == val1) |
500 | return 0; | |
501 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 502 | return 0; |
636b1ec8 | 503 | } |
2f854b82 | 504 | |
636b1ec8 FT |
505 | return -ETIMEDOUT; |
506 | } | |
507 | ||
b32ade12 FT |
508 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
509 | int reg, int bit, int val, int wait) | |
510 | { | |
511 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
512 | reg, bit, val, wait); | |
513 | } | |
514 | ||
1da177e4 LT |
515 | #if NDEBUG |
516 | static struct { | |
c28bda25 RZ |
517 | unsigned char mask; |
518 | const char *name; | |
519 | } signals[] = { | |
520 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
521 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
522 | { SR_SEL, "SEL" }, {0, NULL} | |
523 | }, basrs[] = { | |
524 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
525 | }, icrs[] = { | |
526 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
527 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
528 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
529 | {0, NULL} | |
530 | }, mrs[] = { | |
531 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
532 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
533 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
534 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
535 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
536 | {0, NULL} | |
537 | }; | |
1da177e4 | 538 | |
ff50f9ed FT |
539 | /** |
540 | * NCR5380_print - print scsi bus signals | |
541 | * @instance: adapter state to dump | |
1da177e4 | 542 | * |
ff50f9ed | 543 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
544 | */ |
545 | ||
c28bda25 RZ |
546 | static void NCR5380_print(struct Scsi_Host *instance) |
547 | { | |
548 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 549 | |
c28bda25 RZ |
550 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
551 | status = NCR5380_read(STATUS_REG); | |
552 | mr = NCR5380_read(MODE_REG); | |
553 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
554 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 555 | |
c28bda25 RZ |
556 | printk("STATUS_REG: %02x ", status); |
557 | for (i = 0; signals[i].mask; ++i) | |
558 | if (status & signals[i].mask) | |
559 | printk(",%s", signals[i].name); | |
560 | printk("\nBASR: %02x ", basr); | |
561 | for (i = 0; basrs[i].mask; ++i) | |
562 | if (basr & basrs[i].mask) | |
563 | printk(",%s", basrs[i].name); | |
564 | printk("\nICR: %02x ", icr); | |
565 | for (i = 0; icrs[i].mask; ++i) | |
566 | if (icr & icrs[i].mask) | |
567 | printk(",%s", icrs[i].name); | |
568 | printk("\nMODE: %02x ", mr); | |
569 | for (i = 0; mrs[i].mask; ++i) | |
570 | if (mr & mrs[i].mask) | |
571 | printk(",%s", mrs[i].name); | |
572 | printk("\n"); | |
1da177e4 LT |
573 | } |
574 | ||
575 | static struct { | |
c28bda25 RZ |
576 | unsigned char value; |
577 | const char *name; | |
1da177e4 | 578 | } phases[] = { |
c28bda25 RZ |
579 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
580 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
581 | {PHASE_UNKNOWN, "UNKNOWN"} | |
582 | }; | |
1da177e4 | 583 | |
ff50f9ed FT |
584 | /** |
585 | * NCR5380_print_phase - show SCSI phase | |
586 | * @instance: adapter to dump | |
1da177e4 | 587 | * |
ff50f9ed | 588 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 589 | * |
ff50f9ed | 590 | * Locks: none |
1da177e4 LT |
591 | */ |
592 | ||
593 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
594 | { | |
c28bda25 RZ |
595 | unsigned char status; |
596 | int i; | |
597 | ||
598 | status = NCR5380_read(STATUS_REG); | |
599 | if (!(status & SR_REQ)) | |
600 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
601 | else { | |
602 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
603 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
604 | ; | |
605 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
606 | } | |
1da177e4 LT |
607 | } |
608 | ||
1da177e4 LT |
609 | #endif |
610 | ||
8c32513b FT |
611 | /** |
612 | * NCR58380_info - report driver and host information | |
613 | * @instance: relevant scsi host instance | |
1da177e4 | 614 | * |
8c32513b | 615 | * For use as the host template info() handler. |
1da177e4 | 616 | * |
8c32513b | 617 | * Locks: none |
1da177e4 LT |
618 | */ |
619 | ||
8c32513b | 620 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 621 | { |
8c32513b FT |
622 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
623 | ||
624 | return hostdata->info; | |
625 | } | |
626 | ||
627 | static void prepare_info(struct Scsi_Host *instance) | |
628 | { | |
629 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
630 | ||
631 | snprintf(hostdata->info, sizeof(hostdata->info), | |
632 | "%s, io_port 0x%lx, n_io_port %d, " | |
633 | "base 0x%lx, irq %d, " | |
634 | "can_queue %d, cmd_per_lun %d, " | |
635 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 636 | "flags { %s%s}, " |
8c32513b FT |
637 | "options { %s} ", |
638 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
639 | instance->base, instance->irq, | |
640 | instance->can_queue, instance->cmd_per_lun, | |
641 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 642 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 643 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
644 | #ifdef DIFFERENTIAL |
645 | "DIFFERENTIAL " | |
646 | #endif | |
1da177e4 | 647 | #ifdef REAL_DMA |
8c32513b | 648 | "REAL_DMA " |
1da177e4 LT |
649 | #endif |
650 | #ifdef PARITY | |
8c32513b | 651 | "PARITY " |
1da177e4 LT |
652 | #endif |
653 | #ifdef SUPPORT_TAGS | |
8c32513b | 654 | "SUPPORT_TAGS " |
1da177e4 | 655 | #endif |
8c32513b | 656 | ""); |
1da177e4 LT |
657 | } |
658 | ||
ff50f9ed FT |
659 | /** |
660 | * NCR5380_init - initialise an NCR5380 | |
661 | * @instance: adapter to configure | |
662 | * @flags: control flags | |
1da177e4 | 663 | * |
ff50f9ed FT |
664 | * Initializes *instance and corresponding 5380 chip, |
665 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
666 | * |
667 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 668 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 669 | * |
ff50f9ed | 670 | * Returns 0 for success |
1da177e4 LT |
671 | */ |
672 | ||
95fde7a8 | 673 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 674 | { |
c28bda25 RZ |
675 | int i; |
676 | SETUP_HOSTDATA(instance); | |
2f854b82 | 677 | unsigned long deadline; |
c28bda25 | 678 | |
a53a21e4 | 679 | hostdata->host = instance; |
c28bda25 RZ |
680 | hostdata->id_mask = 1 << instance->this_id; |
681 | hostdata->id_higher_mask = 0; | |
682 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
683 | if (i > hostdata->id_mask) | |
684 | hostdata->id_higher_mask |= i; | |
685 | for (i = 0; i < 8; ++i) | |
686 | hostdata->busy[i] = 0; | |
1da177e4 | 687 | #ifdef SUPPORT_TAGS |
ca513fc9 | 688 | init_tags(hostdata); |
1da177e4 LT |
689 | #endif |
690 | #if defined (REAL_DMA) | |
c28bda25 | 691 | hostdata->dma_len = 0; |
1da177e4 | 692 | #endif |
11d2f63b | 693 | spin_lock_init(&hostdata->lock); |
c28bda25 RZ |
694 | hostdata->connected = NULL; |
695 | hostdata->issue_queue = NULL; | |
696 | hostdata->disconnected_queue = NULL; | |
ef1081cb | 697 | hostdata->flags = flags; |
c28bda25 | 698 | |
a53a21e4 | 699 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
700 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
701 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
702 | 1, instance->host_no); | |
703 | if (!hostdata->work_q) | |
704 | return -ENOMEM; | |
1da177e4 | 705 | |
8c32513b FT |
706 | prepare_info(instance); |
707 | ||
c28bda25 RZ |
708 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
709 | NCR5380_write(MODE_REG, MR_BASE); | |
710 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
711 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 712 | |
2f854b82 FT |
713 | /* Calibrate register polling loop */ |
714 | i = 0; | |
715 | deadline = jiffies + 1; | |
716 | do { | |
717 | cpu_relax(); | |
718 | } while (time_is_after_jiffies(deadline)); | |
719 | deadline += msecs_to_jiffies(256); | |
720 | do { | |
721 | NCR5380_read(STATUS_REG); | |
722 | ++i; | |
723 | cpu_relax(); | |
724 | } while (time_is_after_jiffies(deadline)); | |
725 | hostdata->accesses_per_ms = i / 256; | |
726 | ||
c28bda25 | 727 | return 0; |
1da177e4 LT |
728 | } |
729 | ||
636b1ec8 FT |
730 | /** |
731 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
732 | * @instance: adapter to check | |
733 | * | |
734 | * If the system crashed, it may have crashed with a connected target and | |
735 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
736 | * currently established nexus, which we know nothing about. Failing that | |
737 | * do a bus reset. | |
738 | * | |
739 | * Note that a bus reset will cause the chip to assert IRQ. | |
740 | * | |
741 | * Returns 0 if successful, otherwise -ENXIO. | |
742 | */ | |
743 | ||
744 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
745 | { | |
9c3f0e2b | 746 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
747 | int pass; |
748 | ||
749 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
750 | switch (pass) { | |
751 | case 1: | |
752 | case 3: | |
753 | case 5: | |
754 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
755 | NCR5380_poll_politely(instance, | |
756 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
757 | break; | |
758 | case 2: | |
759 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
760 | do_abort(instance); | |
761 | break; | |
762 | case 4: | |
763 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
764 | do_reset(instance); | |
9c3f0e2b FT |
765 | /* Wait after a reset; the SCSI standard calls for |
766 | * 250ms, we wait 500ms to be on the safe side. | |
767 | * But some Toshiba CD-ROMs need ten times that. | |
768 | */ | |
769 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
770 | msleep(2500); | |
771 | else | |
772 | msleep(500); | |
636b1ec8 FT |
773 | break; |
774 | case 6: | |
775 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
776 | return -ENXIO; | |
777 | } | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
ff50f9ed FT |
782 | /** |
783 | * NCR5380_exit - remove an NCR5380 | |
784 | * @instance: adapter to remove | |
785 | * | |
786 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
787 | */ | |
788 | ||
6323e4fe GU |
789 | static void NCR5380_exit(struct Scsi_Host *instance) |
790 | { | |
a53a21e4 FT |
791 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
792 | ||
793 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 794 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
795 | } |
796 | ||
ff50f9ed FT |
797 | /** |
798 | * NCR5380_queue_command - queue a command | |
799 | * @instance: the relevant SCSI adapter | |
800 | * @cmd: SCSI command | |
1da177e4 | 801 | * |
1bb40589 | 802 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
803 | * twiddling done to the host specific fields of cmd. If the |
804 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
805 | */ |
806 | ||
16b29e75 FT |
807 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
808 | struct scsi_cmnd *cmd) | |
1da177e4 | 809 | { |
16b29e75 | 810 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 811 | struct scsi_cmnd *tmp; |
c28bda25 | 812 | unsigned long flags; |
1da177e4 LT |
813 | |
814 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
815 | switch (cmd->cmnd[0]) { |
816 | case WRITE_6: | |
817 | case WRITE_10: | |
dbb6b350 | 818 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 819 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 820 | cmd->scsi_done(cmd); |
c28bda25 RZ |
821 | return 0; |
822 | } | |
1da177e4 LT |
823 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
824 | ||
c28bda25 RZ |
825 | /* |
826 | * We use the host_scribble field as a pointer to the next command | |
827 | * in a queue | |
828 | */ | |
829 | ||
3130d905 | 830 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
831 | cmd->result = 0; |
832 | ||
833 | /* | |
834 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
835 | * commands are added to the head of the queue since any command will | |
836 | * clear the contingent allegiance condition that exists and the | |
837 | * sense data is only guaranteed to be valid while the condition exists. | |
838 | */ | |
839 | ||
c28bda25 RZ |
840 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
841 | * Otherwise a running NCR5380_main may steal the lock. | |
842 | * Lock before actually inserting due to fairness reasons explained in | |
843 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
844 | * to release the lock. | |
845 | * Stop timer for this command while waiting for the lock, or timeouts | |
846 | * may happen (and they really do), and it's no good if the command doesn't | |
847 | * appear in any of the queues. | |
848 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
849 | * because also a timer int can trigger an abort or reset, which would | |
850 | * alter queues and touch the lock. | |
851 | */ | |
e3c3da67 | 852 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
853 | return SCSI_MLQUEUE_HOST_BUSY; |
854 | ||
11d2f63b | 855 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 856 | |
ff50f9ed FT |
857 | /* |
858 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
859 | * commands are added to the head of the queue since any command will | |
860 | * clear the contingent allegiance condition that exists and the | |
861 | * sense data is only guaranteed to be valid while the condition exists. | |
862 | */ | |
863 | ||
c28bda25 RZ |
864 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
865 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 866 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
867 | hostdata->issue_queue = cmd; |
868 | } else { | |
710ddd0d | 869 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
870 | NEXT(tmp); tmp = NEXT(tmp)) |
871 | ; | |
872 | LIST(cmd, tmp); | |
3130d905 | 873 | SET_NEXT(tmp, cmd); |
c28bda25 | 874 | } |
11d2f63b | 875 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 876 | |
dbb6b350 FT |
877 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
878 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 879 | |
010e89d1 FT |
880 | /* Kick off command processing */ |
881 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 882 | return 0; |
1da177e4 LT |
883 | } |
884 | ||
e3c3da67 FT |
885 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
886 | { | |
887 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
888 | ||
889 | /* Caller does the locking needed to set & test these data atomically */ | |
890 | if (!hostdata->disconnected_queue && | |
891 | !hostdata->issue_queue && | |
892 | !hostdata->connected && | |
893 | !hostdata->retain_dma_intr) | |
894 | NCR5380_release_dma_irq(instance); | |
895 | } | |
896 | ||
ff50f9ed FT |
897 | /** |
898 | * NCR5380_main - NCR state machines | |
1da177e4 | 899 | * |
ff50f9ed FT |
900 | * NCR5380_main is a coroutine that runs as long as more work can |
901 | * be done on the NCR5380 host adapters in a system. Both | |
902 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
903 | * in case it is not running. | |
c28bda25 | 904 | * |
ff50f9ed | 905 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
906 | */ |
907 | ||
b312b38c | 908 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 909 | { |
a53a21e4 FT |
910 | struct NCR5380_hostdata *hostdata = |
911 | container_of(work, struct NCR5380_hostdata, main_task); | |
912 | struct Scsi_Host *instance = hostdata->host; | |
710ddd0d | 913 | struct scsi_cmnd *tmp, *prev; |
c28bda25 | 914 | int done; |
c28bda25 RZ |
915 | |
916 | /* | |
c28bda25 RZ |
917 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
918 | * because also a timer int can trigger an abort or reset, which can | |
919 | * alter queues and touch the Falcon lock. | |
920 | */ | |
921 | ||
11d2f63b | 922 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 923 | do { |
c28bda25 RZ |
924 | done = 1; |
925 | ||
926 | if (!hostdata->connected) { | |
d65e634a | 927 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
928 | /* |
929 | * Search through the issue_queue for a command destined | |
930 | * for a target that's not busy. | |
931 | */ | |
1da177e4 | 932 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 933 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
934 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
935 | ; | |
936 | /*printk("%p ", tmp);*/ | |
937 | if ((tmp == prev) && tmp) | |
938 | printk(" LOOP\n"); | |
939 | /* else printk("\n"); */ | |
1da177e4 | 940 | #endif |
710ddd0d | 941 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 942 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 943 | u8 lun = tmp->device->lun; |
1da177e4 | 944 | |
e3f463b0 FT |
945 | dprintk(NDEBUG_LISTS, |
946 | "MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
947 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], | |
948 | lun); | |
c28bda25 | 949 | /* When we find one, remove it from the issue queue. */ |
c28bda25 | 950 | if ( |
1da177e4 | 951 | #ifdef SUPPORT_TAGS |
c28bda25 | 952 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 953 | #else |
9cb78c16 | 954 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 955 | #endif |
c28bda25 | 956 | ) { |
c28bda25 RZ |
957 | if (prev) { |
958 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 959 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
960 | } else { |
961 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
962 | hostdata->issue_queue = NEXT(tmp); | |
963 | } | |
3130d905 | 964 | SET_NEXT(tmp, NULL); |
ef1081cb | 965 | hostdata->retain_dma_intr++; |
c28bda25 | 966 | |
c28bda25 RZ |
967 | /* |
968 | * Attempt to establish an I_T_L nexus here. | |
969 | * On success, instance->hostdata->connected is set. | |
970 | * On failure, we must add the command back to the | |
971 | * issue queue so we can keep trying. | |
972 | */ | |
d65e634a | 973 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 974 | "lun %d removed from issue_queue\n", |
9cb78c16 | 975 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
976 | /* |
977 | * REQUEST SENSE commands are issued without tagged | |
978 | * queueing, even on SCSI-II devices because the | |
979 | * contingent allegiance condition exists for the | |
980 | * entire unit. | |
981 | */ | |
982 | /* ++roman: ...and the standard also requires that | |
983 | * REQUEST SENSE command are untagged. | |
984 | */ | |
985 | ||
1da177e4 | 986 | #ifdef SUPPORT_TAGS |
c28bda25 | 987 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 988 | #endif |
76f13b93 | 989 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 990 | /* OK or bad target */ |
ef1081cb | 991 | hostdata->retain_dma_intr--; |
e3c3da67 | 992 | maybe_release_dma_irq(instance); |
c28bda25 | 993 | } else { |
1f1b0c74 | 994 | /* Need to retry */ |
c28bda25 | 995 | LIST(tmp, hostdata->issue_queue); |
3130d905 | 996 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 997 | hostdata->issue_queue = tmp; |
1da177e4 | 998 | #ifdef SUPPORT_TAGS |
c28bda25 | 999 | cmd_free_tag(tmp); |
1da177e4 | 1000 | #endif |
ef1081cb | 1001 | hostdata->retain_dma_intr--; |
1d3db59d | 1002 | done = 0; |
d65e634a | 1003 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 | 1004 | "returned to issue_queue\n", HOSTNO); |
c28bda25 | 1005 | } |
1f1b0c74 FT |
1006 | if (hostdata->connected) |
1007 | break; | |
c28bda25 RZ |
1008 | } /* if target/lun/target queue is not busy */ |
1009 | } /* for issue_queue */ | |
1010 | } /* if (!hostdata->connected) */ | |
1011 | ||
1012 | if (hostdata->connected | |
1da177e4 | 1013 | #ifdef REAL_DMA |
c28bda25 | 1014 | && !hostdata->dma_len |
1da177e4 | 1015 | #endif |
c28bda25 | 1016 | ) { |
d65e634a | 1017 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1018 | HOSTNO); |
1019 | NCR5380_information_transfer(instance); | |
d65e634a | 1020 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1021 | done = 0; |
1022 | } | |
1023 | } while (!done); | |
11d2f63b | 1024 | spin_unlock_irq(&hostdata->lock); |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | ||
1028 | #ifdef REAL_DMA | |
1029 | /* | |
1030 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1031 | * | |
1032 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1033 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1034 | * |
1035 | * Inputs : instance - this instance of the NCR5380. | |
1036 | * | |
1037 | */ | |
1038 | ||
c28bda25 | 1039 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1040 | { |
c28bda25 | 1041 | SETUP_HOSTDATA(instance); |
01bd9081 | 1042 | int transferred; |
e3f463b0 | 1043 | unsigned char **data; |
c28bda25 | 1044 | volatile int *count; |
e3f463b0 FT |
1045 | int saved_data = 0, overrun = 0; |
1046 | unsigned char p; | |
c28bda25 | 1047 | |
ef1081cb | 1048 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1049 | p = hostdata->connected->SCp.phase; |
1050 | if (p & SR_IO) { | |
1051 | udelay(10); | |
1052 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1053 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1054 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1055 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1056 | overrun = 1; | |
d65e634a | 1057 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1058 | } |
1059 | } | |
1060 | } | |
1061 | ||
e3f463b0 FT |
1062 | #if defined(CONFIG_SUN3) |
1063 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1064 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1065 | instance->host_no); | |
1066 | BUG(); | |
1067 | } | |
1068 | ||
1069 | /* make sure we're not stuck in a data phase */ | |
1070 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1071 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1072 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1073 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1074 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1075 | instance->host_no); | |
1076 | BUG(); | |
1077 | } | |
1078 | #endif | |
1079 | ||
c28bda25 RZ |
1080 | NCR5380_write(MODE_REG, MR_BASE); |
1081 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1082 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1083 | |
01bd9081 | 1084 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1085 | hostdata->dma_len = 0; |
1086 | ||
1087 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1088 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1089 | *data += transferred; |
1090 | *count -= transferred; | |
c28bda25 | 1091 | |
ef1081cb | 1092 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1093 | int cnt, toPIO; |
1094 | ||
c28bda25 | 1095 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1096 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1097 | if (overrun) { |
d65e634a | 1098 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1099 | *(*data)++ = saved_data; |
1100 | (*count)--; | |
1101 | cnt--; | |
1102 | toPIO--; | |
1103 | } | |
d65e634a | 1104 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1105 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1106 | *count -= toPIO - cnt; | |
1107 | } | |
1da177e4 | 1108 | } |
1da177e4 LT |
1109 | } |
1110 | #endif /* REAL_DMA */ | |
1111 | ||
1112 | ||
ff50f9ed FT |
1113 | /** |
1114 | * NCR5380_intr - generic NCR5380 irq handler | |
1115 | * @irq: interrupt number | |
1116 | * @dev_id: device info | |
1da177e4 | 1117 | * |
ff50f9ed FT |
1118 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1119 | * from the disconnected queue, and restarting NCR5380_main() | |
1120 | * as required. | |
cd400825 FT |
1121 | * |
1122 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1123 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1124 | * Three of these six conditions are latched in the Bus and Status Register: | |
1125 | * - End of DMA (cleared by ending DMA Mode) | |
1126 | * - Parity error (cleared by reading RPIR) | |
1127 | * - Loss of BSY (cleared by reading RPIR) | |
1128 | * Two conditions have flag bits that are not latched: | |
1129 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1130 | * - Bus reset (non-maskable) | |
1131 | * The remaining condition has no flag bit at all: | |
1132 | * - Selection/reselection | |
1133 | * | |
1134 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1135 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1136 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1137 | * interrupts will not be lost (they can be on the DP5380)." | |
1138 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1139 | * | |
1140 | * Checking for bus reset by reading RST is futile because of interrupt | |
1141 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1142 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1143 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1144 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1145 | */ |
1146 | ||
c28bda25 | 1147 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1148 | { |
a53a21e4 | 1149 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1150 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1151 | int handled = 0; |
c28bda25 | 1152 | unsigned char basr; |
11d2f63b FT |
1153 | unsigned long flags; |
1154 | ||
1155 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1156 | |
c28bda25 | 1157 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1158 | if (basr & BASR_IRQ) { |
cd400825 FT |
1159 | unsigned char mr = NCR5380_read(MODE_REG); |
1160 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1161 | ||
1162 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1163 | HOSTNO, irq, basr, sr, mr); | |
1da177e4 LT |
1164 | |
1165 | #if defined(REAL_DMA) | |
cd400825 FT |
1166 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1167 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1168 | * We ack IRQ after clearing Mode Register. Workarounds | |
1169 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1170 | */ |
1171 | ||
cd400825 | 1172 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO); |
c28bda25 | 1173 | |
cd400825 FT |
1174 | if (hostdata->connected) { |
1175 | NCR5380_dma_complete(instance); | |
1176 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1177 | } else { | |
1178 | NCR5380_write(MODE_REG, MR_BASE); | |
1179 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1180 | } | |
1181 | } else | |
1da177e4 | 1182 | #endif /* REAL_DMA */ |
cd400825 FT |
1183 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1184 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1185 | /* Probably reselected */ | |
1186 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1187 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1188 | ||
1189 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1190 | HOSTNO); | |
1191 | ||
1192 | if (!hostdata->connected) { | |
1193 | NCR5380_reselect(instance); | |
1194 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1195 | } | |
1196 | if (!hostdata->connected) | |
1197 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1198 | } else { | |
1199 | /* Probably Bus Reset */ | |
1200 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1201 | ||
1202 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO); | |
e3f463b0 | 1203 | #ifdef SUN3_SCSI_VME |
cd400825 | 1204 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1205 | #endif |
cd400825 | 1206 | } |
c28bda25 | 1207 | handled = 1; |
cd400825 FT |
1208 | } else { |
1209 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1210 | #ifdef SUN3_SCSI_VME |
1211 | dregs->csr |= CSR_DMA_ENABLE; | |
1212 | #endif | |
c28bda25 RZ |
1213 | } |
1214 | ||
11d2f63b FT |
1215 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1216 | ||
c28bda25 | 1217 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1218 | } |
1219 | ||
c28bda25 | 1220 | /* |
710ddd0d FT |
1221 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1222 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1223 | * |
1224 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1225 | * including ARBITRATION, SELECTION, and initial message out for |
1226 | * IDENTIFY and queue messages. | |
1da177e4 | 1227 | * |
c28bda25 | 1228 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1229 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1230 | * |
6323876f FT |
1231 | * Returns : -1 if selection failed but should be retried. |
1232 | * 0 if selection failed and should not be retried. | |
1233 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1234 | * |
c28bda25 RZ |
1235 | * Side effects : |
1236 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1237 | * with registers as they should have been on entry - ie |
1238 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1239 | * will cease to drive any SCSI bus signals. | |
1240 | * | |
c28bda25 RZ |
1241 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1242 | * instance->connected will be set to cmd. | |
1243 | * SELECT interrupt will be disabled. | |
1da177e4 | 1244 | * |
c28bda25 | 1245 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1246 | * cmd->result host byte set to DID_BAD_TARGET. |
1247 | */ | |
1248 | ||
710ddd0d | 1249 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1250 | { |
c28bda25 RZ |
1251 | SETUP_HOSTDATA(instance); |
1252 | unsigned char tmp[3], phase; | |
1253 | unsigned char *data; | |
1254 | int len; | |
ae753a33 | 1255 | int err; |
c28bda25 | 1256 | |
8ad3a593 | 1257 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1258 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1259 | instance->this_id); |
1260 | ||
1261 | /* | |
1262 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1263 | * data bus during SELECTION. | |
1264 | */ | |
1265 | ||
c28bda25 | 1266 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1267 | |
c28bda25 RZ |
1268 | /* |
1269 | * Start arbitration. | |
1270 | */ | |
1da177e4 | 1271 | |
c28bda25 RZ |
1272 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1273 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1274 | |
55500d9b FT |
1275 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1276 | * Bus Free Delay, arbitration will begin. | |
1277 | */ | |
c28bda25 | 1278 | |
11d2f63b | 1279 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1280 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1281 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1282 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1283 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1284 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1285 | /* Reselection interrupt */ | |
1286 | return -1; | |
1287 | } | |
1288 | if (err < 0) { | |
1289 | NCR5380_write(MODE_REG, MR_BASE); | |
1290 | shost_printk(KERN_ERR, instance, | |
1291 | "select: arbitration timeout\n"); | |
1292 | return -1; | |
c28bda25 | 1293 | } |
11d2f63b | 1294 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1295 | |
55500d9b | 1296 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1297 | udelay(3); |
1298 | ||
1299 | /* Check for lost arbitration */ | |
1300 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1301 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1302 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1303 | NCR5380_write(MODE_REG, MR_BASE); |
d65e634a | 1304 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 | 1305 | HOSTNO); |
11d2f63b | 1306 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1307 | return -1; |
1308 | } | |
1da177e4 | 1309 | |
cf13b083 FT |
1310 | /* After/during arbitration, BSY should be asserted. |
1311 | * IBM DPES-31080 Version S31Q works now | |
1312 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1313 | */ | |
c28bda25 RZ |
1314 | NCR5380_write(INITIATOR_COMMAND_REG, |
1315 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1316 | ||
c28bda25 RZ |
1317 | /* |
1318 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1319 | * a minimum so we'll udelay ceil(1.2) | |
1320 | */ | |
1da177e4 | 1321 | |
9c3f0e2b FT |
1322 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1323 | udelay(15); | |
1324 | else | |
1325 | udelay(2); | |
c28bda25 | 1326 | |
11d2f63b FT |
1327 | spin_lock_irq(&hostdata->lock); |
1328 | ||
72064a78 FT |
1329 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1330 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
c28bda25 | 1331 | return -1; |
c28bda25 | 1332 | |
d65e634a | 1333 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1334 | |
1335 | /* | |
1336 | * Now that we have won arbitration, start Selection process, asserting | |
1337 | * the host and target ID's on the SCSI bus. | |
1338 | */ | |
1339 | ||
1340 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1341 | ||
1342 | /* | |
1343 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1344 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1345 | * phase immediately after selection. | |
1346 | */ | |
1347 | ||
1348 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1349 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1350 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1351 | |
c28bda25 RZ |
1352 | /* |
1353 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1354 | * otherwise we will trigger an interrupt. | |
1355 | */ | |
c28bda25 | 1356 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1357 | |
11d2f63b FT |
1358 | spin_unlock_irq(&hostdata->lock); |
1359 | ||
c28bda25 RZ |
1360 | /* |
1361 | * The initiator shall then wait at least two deskew delays and release | |
1362 | * the BSY signal. | |
1363 | */ | |
1364 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1365 | ||
1366 | /* Reset BSY */ | |
1367 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1368 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1369 | ||
1370 | /* | |
1371 | * Something weird happens when we cease to drive BSY - looks | |
1372 | * like the board/chip is letting us do another read before the | |
1373 | * appropriate propagation delay has expired, and we're confusing | |
1374 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1375 | * | |
1376 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1377 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1378 | * tighter 'C' code breaks and requires this) solves the problem - | |
1379 | * the 1 us delay is arbitrary, and only used because this delay will | |
1380 | * be the same on other platforms and since it works here, it should | |
1381 | * work there. | |
1382 | * | |
1383 | * wingel suggests that this could be due to failing to wait | |
1384 | * one deskew delay. | |
1385 | */ | |
1da177e4 | 1386 | |
c28bda25 | 1387 | udelay(1); |
1da177e4 | 1388 | |
d65e634a | 1389 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1390 | |
c28bda25 RZ |
1391 | /* |
1392 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1393 | * selection. | |
1394 | */ | |
1da177e4 | 1395 | |
ae753a33 FT |
1396 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1397 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1398 | |
1399 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1400 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1401 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1402 | NCR5380_reselect(instance); | |
cd400825 FT |
1403 | if (!hostdata->connected) |
1404 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
c28bda25 RZ |
1405 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
1406 | HOSTNO); | |
c28bda25 RZ |
1407 | return -1; |
1408 | } | |
1da177e4 | 1409 | |
ae753a33 | 1410 | if (err < 0) { |
11d2f63b | 1411 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1412 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1413 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1414 | #ifdef SUPPORT_TAGS |
c28bda25 | 1415 | cmd_free_tag(cmd); |
1da177e4 | 1416 | #endif |
c28bda25 RZ |
1417 | cmd->scsi_done(cmd); |
1418 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1419 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1420 | return 0; |
1421 | } | |
1422 | ||
ae753a33 FT |
1423 | /* |
1424 | * No less than two deskew delays after the initiator detects the | |
1425 | * BSY signal is true, it shall release the SEL signal and may | |
1426 | * change the DATA BUS. -wingel | |
1427 | */ | |
1428 | ||
1429 | udelay(1); | |
1430 | ||
1431 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1432 | ||
c28bda25 RZ |
1433 | /* |
1434 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1435 | * was true but before BSY was false during selection, the information | |
1436 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1437 | * IDENTIFY message. | |
1438 | * | |
1439 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1440 | * message (2 bytes) with a tag ID that we increment with every command | |
1441 | * until it wraps back to 0. | |
1442 | * | |
1443 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1444 | * which claim to support tagged queuing but fail when more than | |
1445 | * some number of commands are issued at once. | |
1446 | */ | |
1447 | ||
1448 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1449 | |
1450 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1451 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1452 | if (err < 0) { |
1453 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1454 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1455 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1456 | return -1; | |
1457 | } | |
c28bda25 | 1458 | |
d65e634a | 1459 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1460 | HOSTNO, cmd->device->id); |
1461 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1462 | |
1463 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1464 | if (cmd->tag != TAG_NONE) { |
1465 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1466 | tmp[2] = cmd->tag; | |
1467 | len = 3; | |
1468 | } else | |
1469 | len = 1; | |
1da177e4 | 1470 | #else |
c28bda25 RZ |
1471 | len = 1; |
1472 | cmd->tag = 0; | |
1da177e4 LT |
1473 | #endif /* SUPPORT_TAGS */ |
1474 | ||
c28bda25 RZ |
1475 | /* Send message(s) */ |
1476 | data = tmp; | |
1477 | phase = PHASE_MSGOUT; | |
1478 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1479 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 | 1480 | /* XXX need to handle errors here */ |
11d2f63b | 1481 | |
c28bda25 | 1482 | hostdata->connected = cmd; |
1da177e4 | 1483 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1484 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1485 | #endif | |
e3f463b0 FT |
1486 | #ifdef SUN3_SCSI_VME |
1487 | dregs->csr |= CSR_INTR; | |
1488 | #endif | |
1da177e4 | 1489 | |
c28bda25 | 1490 | initialize_SCp(cmd); |
1da177e4 | 1491 | |
c28bda25 | 1492 | return 0; |
1da177e4 LT |
1493 | } |
1494 | ||
c28bda25 RZ |
1495 | /* |
1496 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1497 | * unsigned char *phase, int *count, unsigned char **data) |
1498 | * | |
1499 | * Purpose : transfers data in given phase using polled I/O | |
1500 | * | |
c28bda25 RZ |
1501 | * Inputs : instance - instance of driver, *phase - pointer to |
1502 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1503 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1504 | * |
1da177e4 | 1505 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1506 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1507 | * is in same phase. |
1508 | * | |
c28bda25 | 1509 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1510 | * |
1511 | * XXX Note : handling for bus free may be useful. | |
1512 | */ | |
1513 | ||
1514 | /* | |
c28bda25 | 1515 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1516 | * IS 100% reliable, and for the actual data transfer where speed |
1517 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1518 | */ | |
1519 | ||
c28bda25 RZ |
1520 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1521 | unsigned char *phase, int *count, | |
1522 | unsigned char **data) | |
1da177e4 | 1523 | { |
c28bda25 RZ |
1524 | register unsigned char p = *phase, tmp; |
1525 | register int c = *count; | |
1526 | register unsigned char *d = *data; | |
1527 | ||
1528 | /* | |
1529 | * The NCR5380 chip will only drive the SCSI bus when the | |
1530 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1531 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1532 | */ |
1da177e4 | 1533 | |
c28bda25 | 1534 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1535 | |
c28bda25 RZ |
1536 | do { |
1537 | /* | |
1538 | * Wait for assertion of REQ, after which the phase bits will be | |
1539 | * valid | |
1540 | */ | |
686f3990 FT |
1541 | |
1542 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1543 | break; | |
1da177e4 | 1544 | |
d65e634a | 1545 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1546 | |
c28bda25 | 1547 | /* Check for phase mismatch */ |
686f3990 | 1548 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1549 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1550 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1551 | break; |
1552 | } | |
1da177e4 | 1553 | |
c28bda25 RZ |
1554 | /* Do actual transfer from SCSI bus to / from memory */ |
1555 | if (!(p & SR_IO)) | |
1556 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1557 | else | |
1558 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1559 | |
c28bda25 | 1560 | ++d; |
1da177e4 | 1561 | |
c28bda25 RZ |
1562 | /* |
1563 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1564 | * should drop ATN on the last byte of the message phase | |
1565 | * after REQ has been asserted for the handshake but before | |
1566 | * the initiator raises ACK. | |
1567 | */ | |
1da177e4 | 1568 | |
c28bda25 RZ |
1569 | if (!(p & SR_IO)) { |
1570 | if (!((p & SR_MSG) && c > 1)) { | |
1571 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1572 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1573 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1574 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1575 | } else { | |
1576 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1577 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1578 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1579 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1580 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1581 | } | |
1582 | } else { | |
8ad3a593 | 1583 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1584 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1585 | } | |
1da177e4 | 1586 | |
a2edc4a6 FT |
1587 | if (NCR5380_poll_politely(instance, |
1588 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1589 | break; | |
c28bda25 | 1590 | |
d65e634a | 1591 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1592 | |
1593 | /* | |
1594 | * We have several special cases to consider during REQ/ACK handshaking : | |
1595 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1596 | * message. ATN must be dropped as ACK is dropped. | |
1597 | * | |
1598 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1599 | * message. We must exit with ACK asserted, so that the calling | |
1600 | * code may raise ATN before dropping ACK to reject the message. | |
1601 | * | |
1602 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1603 | */ | |
1604 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1605 | if (p == PHASE_MSGOUT && c > 1) | |
1606 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1607 | else | |
1608 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1609 | } | |
1610 | } while (--c); | |
1611 | ||
d65e634a | 1612 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1613 | |
1614 | *count = c; | |
1615 | *data = d; | |
1616 | tmp = NCR5380_read(STATUS_REG); | |
1617 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1618 | * asserted or if ACK hasn't been released yet. The latter applies if |
1619 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1620 | */ |
a2edc4a6 | 1621 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1622 | *phase = tmp & PHASE_MASK; |
1623 | else | |
1624 | *phase = PHASE_UNKNOWN; | |
1625 | ||
1626 | if (!c || (*phase == p)) | |
1627 | return 0; | |
1628 | else | |
1629 | return -1; | |
1da177e4 LT |
1630 | } |
1631 | ||
636b1ec8 FT |
1632 | /** |
1633 | * do_reset - issue a reset command | |
1634 | * @instance: adapter to reset | |
1635 | * | |
1636 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1637 | * back into sane shape. | |
1638 | * | |
1639 | * This clears the reset interrupt flag because there may be no handler for | |
1640 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1641 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1642 | */ | |
1643 | ||
1644 | static void do_reset(struct Scsi_Host *instance) | |
1645 | { | |
1646 | unsigned long flags; | |
1647 | ||
1648 | local_irq_save(flags); | |
1649 | NCR5380_write(TARGET_COMMAND_REG, | |
1650 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1651 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1652 | udelay(50); | |
1653 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1654 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1655 | local_irq_restore(flags); | |
1656 | } | |
1657 | ||
80d3eb6d FT |
1658 | /** |
1659 | * do_abort - abort the currently established nexus by going to | |
1660 | * MESSAGE OUT phase and sending an ABORT message. | |
1661 | * @instance: relevant scsi host instance | |
c28bda25 | 1662 | * |
80d3eb6d | 1663 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1664 | */ |
1665 | ||
a53a21e4 | 1666 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1667 | { |
c28bda25 RZ |
1668 | unsigned char tmp, *msgptr, phase; |
1669 | int len; | |
80d3eb6d | 1670 | int rc; |
c28bda25 RZ |
1671 | |
1672 | /* Request message out phase */ | |
1da177e4 | 1673 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1674 | |
1675 | /* | |
1676 | * Wait for the target to indicate a valid phase by asserting | |
1677 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1678 | * and can immediately send the ABORT message, or we'll have some | |
1679 | * other phase and will have to source/sink data. | |
1680 | * | |
1681 | * We really don't care what value was on the bus or what value | |
1682 | * the target sees, so we just handshake. | |
1683 | */ | |
1684 | ||
80d3eb6d FT |
1685 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1686 | if (rc < 0) | |
1687 | goto timeout; | |
1688 | ||
1689 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1690 | |
1691 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1692 | ||
80d3eb6d FT |
1693 | if (tmp != PHASE_MSGOUT) { |
1694 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1695 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1696 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1697 | if (rc < 0) | |
1698 | goto timeout; | |
c28bda25 RZ |
1699 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1700 | } | |
1701 | ||
1702 | tmp = ABORT; | |
1703 | msgptr = &tmp; | |
1704 | len = 1; | |
1705 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1706 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1707 | |
1708 | /* | |
1709 | * If we got here, and the command completed successfully, | |
1710 | * we're about to go into bus free state. | |
1711 | */ | |
1712 | ||
1713 | return len ? -1 : 0; | |
80d3eb6d FT |
1714 | |
1715 | timeout: | |
1716 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1717 | return -1; | |
1da177e4 LT |
1718 | } |
1719 | ||
1720 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1721 | /* |
1722 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1723 | * unsigned char *phase, int *count, unsigned char **data) |
1724 | * | |
1725 | * Purpose : transfers data in given phase using either real | |
1726 | * or pseudo DMA. | |
1727 | * | |
c28bda25 RZ |
1728 | * Inputs : instance - instance of driver, *phase - pointer to |
1729 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1730 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1731 | * |
1da177e4 | 1732 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1733 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1734 | * is in same phase. |
1735 | * | |
c28bda25 | 1736 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1737 | * |
1738 | */ | |
1739 | ||
1740 | ||
c28bda25 RZ |
1741 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1742 | unsigned char *phase, int *count, | |
1743 | unsigned char **data) | |
1da177e4 | 1744 | { |
c28bda25 RZ |
1745 | SETUP_HOSTDATA(instance); |
1746 | register int c = *count; | |
1747 | register unsigned char p = *phase; | |
e3f463b0 FT |
1748 | |
1749 | #if defined(CONFIG_SUN3) | |
1750 | /* sanity check */ | |
1751 | if (!sun3_dma_setup_done) { | |
1752 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1753 | instance->host_no); | |
1754 | BUG(); | |
1755 | } | |
1756 | hostdata->dma_len = c; | |
1757 | ||
1758 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1759 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1760 | c, (p & SR_IO) ? "to" : "from", *data); | |
1761 | ||
1762 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1763 | |
1764 | /* send start chain */ | |
1765 | sun3scsi_dma_start(c, *data); | |
1766 | ||
cd400825 FT |
1767 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1768 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1769 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1770 | if (p & SR_IO) { |
e3f463b0 | 1771 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1772 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1773 | } else { | |
e3f463b0 | 1774 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1775 | NCR5380_write(START_DMA_SEND_REG, 0); |
1776 | } | |
1777 | ||
1778 | #ifdef SUN3_SCSI_VME | |
1779 | dregs->csr |= CSR_DMA_ENABLE; | |
1780 | #endif | |
1781 | ||
e3f463b0 FT |
1782 | sun3_dma_active = 1; |
1783 | ||
1784 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1785 | register unsigned char *d = *data; |
1786 | unsigned char tmp; | |
c28bda25 RZ |
1787 | |
1788 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1789 | *phase = tmp; | |
1790 | return -1; | |
1791 | } | |
1da177e4 | 1792 | |
ef1081cb FT |
1793 | if (hostdata->read_overruns && (p & SR_IO)) |
1794 | c -= hostdata->read_overruns; | |
1da177e4 | 1795 | |
d65e634a | 1796 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1797 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1798 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1799 | |
c28bda25 | 1800 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1801 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1802 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1803 | |
ef1081cb | 1804 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1805 | /* On the Medusa, it is a must to initialize the DMA before |
1806 | * starting the NCR. This is also the cleaner way for the TT. | |
1807 | */ | |
c28bda25 RZ |
1808 | hostdata->dma_len = (p & SR_IO) ? |
1809 | NCR5380_dma_read_setup(instance, d, c) : | |
1810 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1811 | } |
1812 | ||
1813 | if (p & SR_IO) | |
1814 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1815 | else { | |
1816 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1817 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1818 | } | |
1819 | ||
ef1081cb | 1820 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1821 | /* On the Falcon, the DMA setup must be done after the last */ |
1822 | /* NCR access, else the DMA setup gets trashed! | |
1823 | */ | |
c28bda25 RZ |
1824 | hostdata->dma_len = (p & SR_IO) ? |
1825 | NCR5380_dma_read_setup(instance, d, c) : | |
1826 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1827 | } |
e3f463b0 FT |
1828 | #endif /* !defined(CONFIG_SUN3) */ |
1829 | ||
c28bda25 | 1830 | return 0; |
1da177e4 LT |
1831 | } |
1832 | #endif /* defined(REAL_DMA) */ | |
1833 | ||
1834 | /* | |
1835 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1836 | * | |
c28bda25 RZ |
1837 | * Purpose : run through the various SCSI phases and do as the target |
1838 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1839 | * instance->connected. |
1840 | * | |
1841 | * Inputs : instance, instance for which we are doing commands | |
1842 | * | |
c28bda25 | 1843 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1844 | * modified if a command disconnects, *instance->connected will |
1845 | * change. | |
1846 | * | |
c28bda25 RZ |
1847 | * XXX Note : we need to watch for bus free or a reset condition here |
1848 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1849 | */ |
c28bda25 RZ |
1850 | |
1851 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1852 | { |
c28bda25 | 1853 | SETUP_HOSTDATA(instance); |
c28bda25 RZ |
1854 | unsigned char msgout = NOP; |
1855 | int sink = 0; | |
1856 | int len; | |
1da177e4 | 1857 | #if defined(REAL_DMA) |
c28bda25 | 1858 | int transfersize; |
1da177e4 | 1859 | #endif |
c28bda25 RZ |
1860 | unsigned char *data; |
1861 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1862 | struct scsi_cmnd *cmd; |
c28bda25 | 1863 | |
e3f463b0 FT |
1864 | #ifdef SUN3_SCSI_VME |
1865 | dregs->csr |= CSR_INTR; | |
1866 | #endif | |
1867 | ||
11d2f63b | 1868 | while ((cmd = hostdata->connected)) { |
c28bda25 RZ |
1869 | tmp = NCR5380_read(STATUS_REG); |
1870 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1871 | if (tmp & SR_REQ) { | |
1872 | phase = (tmp & PHASE_MASK); | |
1873 | if (phase != old_phase) { | |
1874 | old_phase = phase; | |
8ad3a593 | 1875 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1876 | } |
e3f463b0 FT |
1877 | #if defined(CONFIG_SUN3) |
1878 | if (phase == PHASE_CMDOUT) { | |
1879 | #if defined(REAL_DMA) | |
1880 | void *d; | |
1881 | unsigned long count; | |
1882 | ||
1883 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1884 | count = cmd->SCp.buffer->length; | |
1885 | d = sg_virt(cmd->SCp.buffer); | |
1886 | } else { | |
1887 | count = cmd->SCp.this_residual; | |
1888 | d = cmd->SCp.ptr; | |
1889 | } | |
1890 | /* this command setup for dma yet? */ | |
1891 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1892 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
1893 | sun3scsi_dma_setup(d, count, | |
1894 | rq_data_dir(cmd->request)); | |
1895 | sun3_dma_setup_done = cmd; | |
1896 | } | |
1897 | } | |
1898 | #endif | |
1899 | #ifdef SUN3_SCSI_VME | |
1900 | dregs->csr |= CSR_INTR; | |
1901 | #endif | |
1902 | } | |
1903 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1904 | |
c28bda25 RZ |
1905 | if (sink && (phase != PHASE_MSGOUT)) { |
1906 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1907 | ||
1908 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1909 | ICR_ASSERT_ACK); | |
1910 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1911 | ; | |
1912 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1913 | ICR_ASSERT_ATN); | |
1914 | sink = 0; | |
1915 | continue; | |
1916 | } | |
1917 | ||
1918 | switch (phase) { | |
1919 | case PHASE_DATAOUT: | |
1da177e4 | 1920 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
1921 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
1922 | "aborted\n", HOSTNO); | |
1923 | sink = 1; | |
1924 | do_abort(instance); | |
1925 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1926 | cmd->scsi_done(cmd); |
c28bda25 | 1927 | return; |
1da177e4 | 1928 | #endif |
c28bda25 RZ |
1929 | case PHASE_DATAIN: |
1930 | /* | |
1931 | * If there is no room left in the current buffer in the | |
1932 | * scatter-gather list, move onto the next one. | |
1933 | */ | |
1934 | ||
1935 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1936 | ++cmd->SCp.buffer; | |
1937 | --cmd->SCp.buffers_residual; | |
1938 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1939 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1940 | /* ++roman: Try to merge some scatter-buffers if |
1941 | * they are at contiguous physical addresses. | |
1942 | */ | |
1943 | merge_contiguous_buffers(cmd); | |
d65e634a | 1944 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
1945 | HOSTNO, cmd->SCp.this_residual, |
1946 | cmd->SCp.buffers_residual); | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | * The preferred transfer method is going to be | |
1951 | * PSEUDO-DMA for systems that are strictly PIO, | |
1952 | * since we can let the hardware do the handshaking. | |
1953 | * | |
1954 | * For this to work, we need to know the transfersize | |
1955 | * ahead of time, since the pseudo-DMA code will sit | |
1956 | * in an unconditional loop. | |
1957 | */ | |
1958 | ||
1959 | /* ++roman: I suggest, this should be | |
1960 | * #if def(REAL_DMA) | |
1961 | * instead of leaving REAL_DMA out. | |
1962 | */ | |
1da177e4 LT |
1963 | |
1964 | #if defined(REAL_DMA) | |
e3f463b0 | 1965 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1966 | transfersize = 0; |
1967 | if (!cmd->device->borken) | |
e3f463b0 | 1968 | #endif |
ff3d4578 FT |
1969 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1970 | ||
1971 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
1972 | len = transfersize; |
1973 | cmd->SCp.phase = phase; | |
1974 | if (NCR5380_transfer_dma(instance, &phase, | |
1975 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1976 | /* | |
1977 | * If the watchdog timer fires, all future | |
1978 | * accesses to this device will use the | |
1979 | * polled-IO. */ | |
ff50f9ed FT |
1980 | scmd_printk(KERN_INFO, cmd, |
1981 | "switching to slow handshake\n"); | |
c28bda25 | 1982 | cmd->device->borken = 1; |
c28bda25 RZ |
1983 | sink = 1; |
1984 | do_abort(instance); | |
1985 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1986 | cmd->scsi_done(cmd); |
c28bda25 RZ |
1987 | /* XXX - need to source or sink data here, as appropriate */ |
1988 | } else { | |
1da177e4 | 1989 | #ifdef REAL_DMA |
c28bda25 RZ |
1990 | /* ++roman: When using real DMA, |
1991 | * information_transfer() should return after | |
1992 | * starting DMA since it has nothing more to | |
1993 | * do. | |
1994 | */ | |
1995 | return; | |
1996 | #else | |
1997 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 1998 | #endif |
c28bda25 RZ |
1999 | } |
2000 | } else | |
1da177e4 | 2001 | #endif /* defined(REAL_DMA) */ |
11d2f63b FT |
2002 | { |
2003 | spin_unlock_irq(&hostdata->lock); | |
c28bda25 RZ |
2004 | NCR5380_transfer_pio(instance, &phase, |
2005 | (int *)&cmd->SCp.this_residual, | |
2006 | (unsigned char **)&cmd->SCp.ptr); | |
11d2f63b FT |
2007 | spin_lock_irq(&hostdata->lock); |
2008 | } | |
e3f463b0 FT |
2009 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2010 | /* if we had intended to dma that command clear it */ | |
2011 | if (sun3_dma_setup_done == cmd) | |
2012 | sun3_dma_setup_done = NULL; | |
2013 | #endif | |
c28bda25 RZ |
2014 | break; |
2015 | case PHASE_MSGIN: | |
2016 | len = 1; | |
2017 | data = &tmp; | |
c28bda25 RZ |
2018 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2019 | cmd->SCp.Message = tmp; | |
2020 | ||
2021 | switch (tmp) { | |
c28bda25 RZ |
2022 | case ABORT: |
2023 | case COMMAND_COMPLETE: | |
2024 | /* Accept message by clearing ACK */ | |
2025 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2026 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2027 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
e3c3da67 | 2028 | |
e3c3da67 | 2029 | hostdata->connected = NULL; |
1da177e4 | 2030 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2031 | cmd_free_tag(cmd); |
2032 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
61d739a4 | 2033 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 2034 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2035 | "QUEUE_FULL after %d commands\n", |
2036 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2037 | ta->nr_allocated); | |
2038 | if (ta->queue_size > ta->nr_allocated) | |
e42d0151 | 2039 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2040 | } |
1da177e4 | 2041 | #else |
c28bda25 | 2042 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2043 | #endif |
c28bda25 RZ |
2044 | |
2045 | /* | |
2046 | * I'm not sure what the correct thing to do here is : | |
2047 | * | |
2048 | * If the command that just executed is NOT a request | |
2049 | * sense, the obvious thing to do is to set the result | |
2050 | * code to the values of the stored parameters. | |
2051 | * | |
2052 | * If it was a REQUEST SENSE command, we need some way to | |
2053 | * differentiate between the failure code of the original | |
2054 | * and the failure code of the REQUEST sense - the obvious | |
2055 | * case is success, where we fall through and leave the | |
2056 | * result code unchanged. | |
2057 | * | |
2058 | * The non-obvious place is where the REQUEST SENSE failed | |
2059 | */ | |
2060 | ||
2061 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2062 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2063 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2064 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2065 | |
28424d3a BH |
2066 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2067 | hostdata->ses.cmd_len) { | |
2068 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2069 | hostdata->ses.cmd_len = 0 ; | |
2070 | } | |
2071 | ||
c28bda25 RZ |
2072 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2073 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2074 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2075 | ||
d65e634a | 2076 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 | 2077 | |
c28bda25 | 2078 | LIST(cmd,hostdata->issue_queue); |
3130d905 | 2079 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2080 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
dbb6b350 FT |
2081 | dsprintk(NDEBUG_QUEUES, instance, |
2082 | "REQUEST SENSE cmd %p added to head of issue queue\n", | |
2083 | cmd); | |
997acab7 | 2084 | } else { |
c28bda25 RZ |
2085 | cmd->scsi_done(cmd); |
2086 | } | |
2087 | ||
c28bda25 RZ |
2088 | /* |
2089 | * Restore phase bits to 0 so an interrupted selection, | |
2090 | * arbitration can resume. | |
2091 | */ | |
2092 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2093 | ||
72064a78 FT |
2094 | /* Enable reselect interrupts */ |
2095 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2096 | ||
c28bda25 RZ |
2097 | /* ++roman: For Falcon SCSI, release the lock on the |
2098 | * ST-DMA here if no other commands are waiting on the | |
2099 | * disconnected queue. | |
2100 | */ | |
e3c3da67 | 2101 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2102 | return; |
2103 | case MESSAGE_REJECT: | |
2104 | /* Accept message by clearing ACK */ | |
2105 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2106 | switch (hostdata->last_message) { |
2107 | case HEAD_OF_QUEUE_TAG: | |
2108 | case ORDERED_QUEUE_TAG: | |
2109 | case SIMPLE_QUEUE_TAG: | |
2110 | /* The target obviously doesn't support tagged | |
2111 | * queuing, even though it announced this ability in | |
2112 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2113 | * clear 'tagged_supported' and lock the LUN, since | |
2114 | * the command is treated as untagged further on. | |
2115 | */ | |
2116 | cmd->device->tagged_supported = 0; | |
2117 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2118 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2119 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2120 | "QUEUE_TAG message; tagged queuing " |
2121 | "disabled\n", | |
2122 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2123 | break; | |
2124 | } | |
2125 | break; | |
2126 | case DISCONNECT: | |
2127 | /* Accept message by clearing ACK */ | |
2128 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 | 2129 | LIST(cmd,hostdata->disconnected_queue); |
3130d905 | 2130 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2131 | hostdata->connected = NULL; |
2132 | hostdata->disconnected_queue = cmd; | |
9cb78c16 | 2133 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2134 | "moved from connected to the " |
2135 | "disconnected_queue\n", HOSTNO, | |
2136 | cmd->device->id, cmd->device->lun); | |
2137 | /* | |
2138 | * Restore phase bits to 0 so an interrupted selection, | |
2139 | * arbitration can resume. | |
2140 | */ | |
2141 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2142 | ||
2143 | /* Enable reselect interrupts */ | |
2144 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2145 | #ifdef SUN3_SCSI_VME |
2146 | dregs->csr |= CSR_DMA_ENABLE; | |
2147 | #endif | |
c28bda25 RZ |
2148 | return; |
2149 | /* | |
2150 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2151 | * operation, in violation of the SCSI spec so we can safely | |
2152 | * ignore SAVE/RESTORE pointers calls. | |
2153 | * | |
2154 | * Unfortunately, some disks violate the SCSI spec and | |
2155 | * don't issue the required SAVE_POINTERS message before | |
2156 | * disconnecting, and we have to break spec to remain | |
2157 | * compatible. | |
2158 | */ | |
2159 | case SAVE_POINTERS: | |
2160 | case RESTORE_POINTERS: | |
2161 | /* Accept message by clearing ACK */ | |
2162 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2163 | break; |
2164 | case EXTENDED_MESSAGE: | |
2165 | /* | |
2166 | * Extended messages are sent in the following format : | |
2167 | * Byte | |
2168 | * 0 EXTENDED_MESSAGE == 1 | |
2169 | * 1 length (includes one byte for code, doesn't | |
2170 | * include first two bytes) | |
2171 | * 2 code | |
2172 | * 3..length+1 arguments | |
2173 | * | |
2174 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2175 | * byte, since spi_print_msg() wants the whole thing. | |
2176 | */ | |
2177 | extended_msg[0] = EXTENDED_MESSAGE; | |
2178 | /* Accept first byte by clearing ACK */ | |
2179 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2180 | ||
11d2f63b FT |
2181 | spin_unlock_irq(&hostdata->lock); |
2182 | ||
d65e634a | 2183 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2184 | |
2185 | len = 2; | |
2186 | data = extended_msg + 1; | |
2187 | phase = PHASE_MSGIN; | |
2188 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2189 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2190 | (int)extended_msg[1], (int)extended_msg[2]); |
2191 | ||
e0783ed3 FT |
2192 | if (!len && extended_msg[1] > 0 && |
2193 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2194 | /* Accept third byte by clearing ACK */ |
2195 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2196 | len = extended_msg[1] - 1; | |
2197 | data = extended_msg + 3; | |
2198 | phase = PHASE_MSGIN; | |
2199 | ||
2200 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2201 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2202 | HOSTNO, len); |
2203 | ||
2204 | switch (extended_msg[2]) { | |
2205 | case EXTENDED_SDTR: | |
2206 | case EXTENDED_WDTR: | |
2207 | case EXTENDED_MODIFY_DATA_POINTER: | |
2208 | case EXTENDED_EXTENDED_IDENTIFY: | |
2209 | tmp = 0; | |
2210 | } | |
2211 | } else if (len) { | |
2212 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2213 | "extended message\n", HOSTNO); | |
2214 | tmp = 0; | |
2215 | } else { | |
2216 | printk(KERN_NOTICE "scsi%d: extended message " | |
2217 | "code %02x length %d is too long\n", | |
2218 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2219 | tmp = 0; | |
2220 | } | |
11d2f63b FT |
2221 | |
2222 | spin_lock_irq(&hostdata->lock); | |
2223 | if (!hostdata->connected) | |
2224 | return; | |
2225 | ||
c28bda25 RZ |
2226 | /* Fall through to reject message */ |
2227 | ||
2228 | /* | |
2229 | * If we get something weird that we aren't expecting, | |
2230 | * reject it. | |
2231 | */ | |
2232 | default: | |
2233 | if (!tmp) { | |
ff50f9ed FT |
2234 | printk(KERN_INFO "scsi%d: rejecting message ", |
2235 | instance->host_no); | |
c28bda25 RZ |
2236 | spi_print_msg(extended_msg); |
2237 | printk("\n"); | |
2238 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2239 | scmd_printk(KERN_INFO, cmd, |
2240 | "rejecting unknown message %02x\n", | |
2241 | tmp); | |
c28bda25 | 2242 | else |
ff50f9ed FT |
2243 | scmd_printk(KERN_INFO, cmd, |
2244 | "rejecting unknown extended message code %02x, length %d\n", | |
2245 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2246 | |
2247 | msgout = MESSAGE_REJECT; | |
2248 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2249 | break; | |
2250 | } /* switch (tmp) */ | |
2251 | break; | |
2252 | case PHASE_MSGOUT: | |
2253 | len = 1; | |
2254 | data = &msgout; | |
2255 | hostdata->last_message = msgout; | |
2256 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2257 | if (msgout == ABORT) { | |
1da177e4 | 2258 | #ifdef SUPPORT_TAGS |
c28bda25 | 2259 | cmd_free_tag(cmd); |
1da177e4 | 2260 | #else |
c28bda25 | 2261 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2262 | #endif |
c28bda25 RZ |
2263 | hostdata->connected = NULL; |
2264 | cmd->result = DID_ERROR << 16; | |
e3c3da67 | 2265 | maybe_release_dma_irq(instance); |
e3c3da67 | 2266 | cmd->scsi_done(cmd); |
cd400825 | 2267 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2268 | return; |
2269 | } | |
2270 | msgout = NOP; | |
2271 | break; | |
2272 | case PHASE_CMDOUT: | |
2273 | len = cmd->cmd_len; | |
2274 | data = cmd->cmnd; | |
2275 | /* | |
2276 | * XXX for performance reasons, on machines with a | |
2277 | * PSEUDO-DMA architecture we should probably | |
2278 | * use the dma transfer function. | |
2279 | */ | |
2280 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2281 | break; | |
2282 | case PHASE_STATIN: | |
2283 | len = 1; | |
2284 | data = &tmp; | |
2285 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2286 | cmd->SCp.Status = tmp; | |
2287 | break; | |
2288 | default: | |
2289 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2290 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2291 | } /* switch(phase) */ |
686f3990 | 2292 | } else { |
11d2f63b | 2293 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2294 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2295 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2296 | } |
11d2f63b | 2297 | } |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | /* | |
2301 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2302 | * | |
c28bda25 | 2303 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2304 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2305 | * nexus has been reestablished, |
c28bda25 | 2306 | * |
1da177e4 LT |
2307 | * Inputs : instance - this instance of the NCR5380. |
2308 | * | |
2309 | */ | |
2310 | ||
2311 | ||
e3f463b0 FT |
2312 | /* it might eventually prove necessary to do a dma setup on |
2313 | reselection, but it doesn't seem to be needed now -- sam */ | |
2314 | ||
c28bda25 | 2315 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2316 | { |
c28bda25 RZ |
2317 | SETUP_HOSTDATA(instance); |
2318 | unsigned char target_mask; | |
e3f463b0 | 2319 | unsigned char lun; |
1da177e4 | 2320 | #ifdef SUPPORT_TAGS |
c28bda25 | 2321 | unsigned char tag; |
1da177e4 | 2322 | #endif |
c28bda25 | 2323 | unsigned char msg[3]; |
e3f463b0 FT |
2324 | int __maybe_unused len; |
2325 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2326 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2327 | |
2328 | /* | |
2329 | * Disable arbitration, etc. since the host adapter obviously | |
2330 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2331 | */ | |
2332 | ||
2333 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2334 | |
2335 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2336 | ||
d65e634a | 2337 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2338 | |
2339 | /* | |
2340 | * At this point, we have detected that our SCSI ID is on the bus, | |
2341 | * SEL is true and BSY was false for at least one bus settle delay | |
2342 | * (400 ns). | |
2343 | * | |
2344 | * We must assert BSY ourselves, until the target drops the SEL | |
2345 | * signal. | |
2346 | */ | |
2347 | ||
2348 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2349 | if (NCR5380_poll_politely(instance, |
2350 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2351 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2352 | return; | |
2353 | } | |
c28bda25 RZ |
2354 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2355 | ||
2356 | /* | |
2357 | * Wait for target to go into MSGIN. | |
2358 | */ | |
2359 | ||
72064a78 FT |
2360 | if (NCR5380_poll_politely(instance, |
2361 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2362 | do_abort(instance); | |
2363 | return; | |
2364 | } | |
c28bda25 | 2365 | |
e3f463b0 FT |
2366 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2367 | /* acknowledge toggle to MSGIN */ | |
2368 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2369 | ||
2370 | /* peek at the byte without really hitting the bus */ | |
2371 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2372 | #else | |
c28bda25 RZ |
2373 | len = 1; |
2374 | data = msg; | |
2375 | phase = PHASE_MSGIN; | |
2376 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2377 | |
2378 | if (len) { | |
2379 | do_abort(instance); | |
2380 | return; | |
2381 | } | |
e3f463b0 | 2382 | #endif |
c28bda25 RZ |
2383 | |
2384 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2385 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2386 | spi_print_msg(msg); |
72064a78 | 2387 | printk("\n"); |
c28bda25 RZ |
2388 | do_abort(instance); |
2389 | return; | |
2390 | } | |
72064a78 | 2391 | lun = msg[0] & 0x07; |
1da177e4 | 2392 | |
e3f463b0 | 2393 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2394 | /* If the phase is still MSGIN, the target wants to send some more |
2395 | * messages. In case it supports tagged queuing, this is probably a | |
2396 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2397 | */ | |
2398 | tag = TAG_NONE; | |
ca513fc9 | 2399 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2400 | /* Accept previous IDENTIFY message by clearing ACK */ |
2401 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2402 | len = 2; | |
2403 | data = msg + 1; | |
2404 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2405 | msg[1] == SIMPLE_QUEUE_TAG) | |
2406 | tag = msg[2]; | |
d65e634a | 2407 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2408 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2409 | } | |
1da177e4 | 2410 | #endif |
c28bda25 RZ |
2411 | |
2412 | /* | |
2413 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2414 | * just reestablished, and remove it from the disconnected queue. | |
2415 | */ | |
2416 | ||
710ddd0d | 2417 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 | 2418 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
72064a78 | 2419 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 | 2420 | #ifdef SUPPORT_TAGS |
c28bda25 | 2421 | && (tag == tmp->tag) |
1da177e4 | 2422 | #endif |
c28bda25 | 2423 | ) { |
c28bda25 RZ |
2424 | if (prev) { |
2425 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2426 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2427 | } else { |
2428 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2429 | hostdata->disconnected_queue = NEXT(tmp); | |
2430 | } | |
3130d905 | 2431 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2432 | break; |
2433 | } | |
1da177e4 | 2434 | } |
c28bda25 RZ |
2435 | |
2436 | if (!tmp) { | |
1da177e4 | 2437 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2438 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2439 | target_mask, lun, tag); | |
2440 | #else | |
2441 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2442 | target_mask, lun); | |
1da177e4 | 2443 | #endif |
c28bda25 RZ |
2444 | /* |
2445 | * Since we have an established nexus that we can't do anything | |
2446 | * with, we must abort it. | |
2447 | */ | |
2448 | do_abort(instance); | |
2449 | return; | |
2450 | } | |
1da177e4 | 2451 | |
e3f463b0 FT |
2452 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2453 | /* engage dma setup for the command we just saw */ | |
2454 | { | |
2455 | void *d; | |
2456 | unsigned long count; | |
2457 | ||
2458 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2459 | count = tmp->SCp.buffer->length; | |
2460 | d = sg_virt(tmp->SCp.buffer); | |
2461 | } else { | |
2462 | count = tmp->SCp.this_residual; | |
2463 | d = tmp->SCp.ptr; | |
2464 | } | |
2465 | /* setup this command for dma if not already */ | |
2466 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2467 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2468 | sun3_dma_setup_done = tmp; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2473 | #endif | |
2474 | ||
c28bda25 RZ |
2475 | /* Accept message by clearing ACK */ |
2476 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2477 | |
e3f463b0 FT |
2478 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2479 | /* If the phase is still MSGIN, the target wants to send some more | |
2480 | * messages. In case it supports tagged queuing, this is probably a | |
2481 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2482 | */ | |
2483 | tag = TAG_NONE; | |
2484 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2485 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2486 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2487 | len = 2; | |
2488 | data = msg + 1; | |
2489 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2490 | msg[1] == SIMPLE_QUEUE_TAG) | |
2491 | tag = msg[2]; | |
2492 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2493 | HOSTNO, target_mask, lun, tag); | |
2494 | } | |
2495 | #endif | |
2496 | ||
c28bda25 | 2497 | hostdata->connected = tmp; |
9cb78c16 | 2498 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2499 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2500 | } |
2501 | ||
2502 | ||
2503 | /* | |
710ddd0d | 2504 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2505 | * |
2506 | * Purpose : abort a command | |
2507 | * | |
710ddd0d | 2508 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2509 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2510 | * used. |
2511 | * | |
b6c92b7e | 2512 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2513 | * |
c28bda25 RZ |
2514 | * XXX - there is no way to abort the command that is currently |
2515 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2516 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2517 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2518 | */ |
2519 | ||
2520 | static | |
710ddd0d | 2521 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2522 | { |
c28bda25 RZ |
2523 | struct Scsi_Host *instance = cmd->device->host; |
2524 | SETUP_HOSTDATA(instance); | |
710ddd0d | 2525 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2526 | unsigned long flags; |
1da177e4 | 2527 | |
1fa6b5fb | 2528 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2529 | |
11d2f63b | 2530 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2531 | |
e5c3fddf FT |
2532 | NCR5380_dprint(NDEBUG_ANY, instance); |
2533 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2534 | |
d65e634a | 2535 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2536 | NCR5380_read(BUS_AND_STATUS_REG), |
2537 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2538 | |
2539 | #if 1 | |
c28bda25 RZ |
2540 | /* |
2541 | * Case 1 : If the command is the currently executing command, | |
2542 | * we'll set the aborted flag and return control so that | |
2543 | * information transfer routine can exit cleanly. | |
2544 | */ | |
1da177e4 | 2545 | |
c28bda25 | 2546 | if (hostdata->connected == cmd) { |
1da177e4 | 2547 | |
d65e634a | 2548 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2549 | /* |
2550 | * We should perform BSY checking, and make sure we haven't slipped | |
2551 | * into BUS FREE. | |
2552 | */ | |
1da177e4 | 2553 | |
c28bda25 RZ |
2554 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2555 | /* | |
2556 | * Since we can't change phases until we've completed the current | |
2557 | * handshake, we have to source or sink a byte of data if the current | |
2558 | * phase is not MSGOUT. | |
2559 | */ | |
1da177e4 | 2560 | |
c28bda25 RZ |
2561 | /* |
2562 | * Return control to the executing NCR drive so we can clear the | |
2563 | * aborted flag and get back into our main loop. | |
2564 | */ | |
1da177e4 | 2565 | |
c28bda25 | 2566 | if (do_abort(instance) == 0) { |
c28bda25 RZ |
2567 | hostdata->connected = NULL; |
2568 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2569 | #ifdef SUPPORT_TAGS |
c28bda25 | 2570 | cmd_free_tag(cmd); |
1da177e4 | 2571 | #else |
c28bda25 | 2572 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2573 | #endif |
e3c3da67 | 2574 | maybe_release_dma_irq(instance); |
11d2f63b | 2575 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2576 | cmd->scsi_done(cmd); |
2b0f834c | 2577 | return SUCCESS; |
c28bda25 | 2578 | } else { |
11d2f63b | 2579 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2580 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2581 | return FAILED; |
c28bda25 RZ |
2582 | } |
2583 | } | |
1da177e4 LT |
2584 | #endif |
2585 | ||
c28bda25 RZ |
2586 | /* |
2587 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2588 | * from the issue queue. | |
2589 | */ | |
710ddd0d FT |
2590 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2591 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2592 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2593 | if (cmd == tmp) { | |
2594 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2595 | (*prev) = NEXT(tmp); | |
3130d905 | 2596 | SET_NEXT(tmp, NULL); |
c28bda25 | 2597 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2598 | maybe_release_dma_irq(instance); |
11d2f63b | 2599 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2600 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2601 | HOSTNO); |
2602 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2603 | * yet... */ | |
2604 | tmp->scsi_done(tmp); | |
2b0f834c | 2605 | return SUCCESS; |
c28bda25 | 2606 | } |
1da177e4 LT |
2607 | } |
2608 | ||
c28bda25 RZ |
2609 | /* |
2610 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2611 | * and let the high level SCSI driver retry at a later time or | |
2612 | * issue a reset. | |
2613 | * | |
2614 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2615 | * and handling them cleanly in this situation would make the common | |
2616 | * case of noresets less efficient, and would pollute our code. So, | |
2617 | * we fail. | |
2618 | */ | |
1da177e4 | 2619 | |
c28bda25 | 2620 | if (hostdata->connected) { |
11d2f63b | 2621 | spin_unlock_irqrestore(&hostdata->lock, flags); |
d65e634a | 2622 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2623 | return FAILED; |
c28bda25 | 2624 | } |
1da177e4 | 2625 | |
c28bda25 RZ |
2626 | /* |
2627 | * Case 4: If the command is currently disconnected from the bus, and | |
2628 | * there are no connected commands, we reconnect the I_T_L or | |
2629 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2630 | * an abort message. | |
2631 | * | |
2632 | * This case is especially ugly. In order to reestablish the nexus, we | |
2633 | * need to call NCR5380_select(). The easiest way to implement this | |
2634 | * function was to abort if the bus was busy, and let the interrupt | |
2635 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2636 | * where necessary, meaning interrupts need to be enabled. | |
2637 | * | |
2638 | * When interrupts are enabled, the queues may change - so we | |
2639 | * can't remove it from the disconnected queue before selecting it | |
2640 | * because that could cause a failure in hashing the nexus if that | |
2641 | * device reselected. | |
2642 | * | |
2643 | * Since the queues may change, we can't use the pointers from when we | |
2644 | * first locate it. | |
2645 | * | |
2646 | * So, we must first locate the command, and if NCR5380_select() | |
2647 | * succeeds, then issue the abort, relocate the command and remove | |
2648 | * it from the disconnected queue. | |
2649 | */ | |
2650 | ||
710ddd0d | 2651 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2652 | tmp = NEXT(tmp)) { |
2653 | if (cmd == tmp) { | |
d65e634a | 2654 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2655 | |
11d2f63b FT |
2656 | if (NCR5380_select(instance, cmd)) { |
2657 | spin_unlock_irq(&hostdata->lock); | |
2b0f834c | 2658 | return FAILED; |
11d2f63b | 2659 | } |
d65e634a | 2660 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2661 | |
2662 | do_abort(instance); | |
2663 | ||
710ddd0d FT |
2664 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2665 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2666 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2667 | if (cmd == tmp) { | |
2668 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2669 | *prev = NEXT(tmp); | |
3130d905 | 2670 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2671 | tmp->result = DID_ABORT << 16; |
2672 | /* We must unlock the tag/LUN immediately here, since the | |
2673 | * target goes to BUS FREE and doesn't send us another | |
2674 | * message (COMMAND_COMPLETE or the like) | |
2675 | */ | |
1da177e4 | 2676 | #ifdef SUPPORT_TAGS |
c28bda25 | 2677 | cmd_free_tag(tmp); |
1da177e4 | 2678 | #else |
c28bda25 | 2679 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2680 | #endif |
e3c3da67 | 2681 | maybe_release_dma_irq(instance); |
11d2f63b | 2682 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 2683 | tmp->scsi_done(tmp); |
2b0f834c | 2684 | return SUCCESS; |
c28bda25 RZ |
2685 | } |
2686 | } | |
1da177e4 LT |
2687 | } |
2688 | } | |
2689 | ||
e3c3da67 FT |
2690 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2691 | * possible at all) At least, we should check if the lock could be | |
2692 | * released after the abort, in case it is kept due to some bug. | |
2693 | */ | |
2694 | maybe_release_dma_irq(instance); | |
11d2f63b | 2695 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2696 | |
c28bda25 RZ |
2697 | /* |
2698 | * Case 5 : If we reached this point, the command was not found in any of | |
2699 | * the queues. | |
2700 | * | |
2701 | * We probably reached this point because of an unlikely race condition | |
2702 | * between the command completing successfully and the abortion code, | |
2703 | * so we won't panic, but we will notify the user in case something really | |
2704 | * broke. | |
2705 | */ | |
1da177e4 | 2706 | |
ad361c98 | 2707 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2708 | |
2b0f834c | 2709 | return FAILED; |
1da177e4 LT |
2710 | } |
2711 | ||
2712 | ||
3be1b3ea FT |
2713 | /** |
2714 | * NCR5380_bus_reset - reset the SCSI bus | |
2715 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2716 | * |
3be1b3ea | 2717 | * Returns SUCCESS |
c28bda25 | 2718 | */ |
1da177e4 | 2719 | |
710ddd0d | 2720 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2721 | { |
e3c3da67 FT |
2722 | struct Scsi_Host *instance = cmd->device->host; |
2723 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2724 | int i; |
2725 | unsigned long flags; | |
1da177e4 | 2726 | |
11d2f63b | 2727 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2728 | |
2729 | #if (NDEBUG & NDEBUG_ANY) | |
2730 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
3be1b3ea | 2731 | #endif |
e5c3fddf FT |
2732 | NCR5380_dprint(NDEBUG_ANY, instance); |
2733 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2734 | |
2735 | do_reset(instance); | |
c28bda25 | 2736 | |
c28bda25 | 2737 | /* reset NCR registers */ |
c28bda25 RZ |
2738 | NCR5380_write(MODE_REG, MR_BASE); |
2739 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2740 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2741 | |
c28bda25 RZ |
2742 | /* After the reset, there are no more connected or disconnected commands |
2743 | * and no busy units; so clear the low-level status here to avoid | |
2744 | * conflicts when the mid-level code tries to wake up the affected | |
2745 | * commands! | |
2746 | */ | |
2747 | ||
2748 | if (hostdata->issue_queue) | |
dbb6b350 | 2749 | dsprintk(NDEBUG_ABORT, instance, "reset aborted issued command(s)\n"); |
c28bda25 | 2750 | if (hostdata->connected) |
dbb6b350 | 2751 | dsprintk(NDEBUG_ABORT, instance, "reset aborted a connected command\n"); |
c28bda25 | 2752 | if (hostdata->disconnected_queue) |
dbb6b350 | 2753 | dsprintk(NDEBUG_ABORT, instance, "reset aborted disconnected command(s)\n"); |
c28bda25 | 2754 | |
c28bda25 RZ |
2755 | hostdata->issue_queue = NULL; |
2756 | hostdata->connected = NULL; | |
2757 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2758 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2759 | free_all_tags(hostdata); |
1da177e4 | 2760 | #endif |
c28bda25 RZ |
2761 | for (i = 0; i < 8; ++i) |
2762 | hostdata->busy[i] = 0; | |
1da177e4 | 2763 | #ifdef REAL_DMA |
c28bda25 | 2764 | hostdata->dma_len = 0; |
1da177e4 | 2765 | #endif |
e3c3da67 FT |
2766 | |
2767 | maybe_release_dma_irq(instance); | |
11d2f63b | 2768 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2769 | |
2b0f834c | 2770 | return SUCCESS; |
1da177e4 | 2771 | } |