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 | ||
db9dff36 | 71 | #include <scsi/scsi_dbg.h> |
1abfd370 | 72 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
73 | |
74 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 RZ |
75 | #define LIST(x, y) \ |
76 | do { \ | |
77 | printk("LINE:%d Adding %p to %p\n", \ | |
78 | __LINE__, (void*)(x), (void*)(y)); \ | |
79 | if ((x) == (y)) \ | |
80 | udelay(5); \ | |
81 | } while (0) | |
82 | #define REMOVE(w, x, y, z) \ | |
83 | do { \ | |
84 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
85 | __LINE__, (void*)(w), (void*)(x), \ | |
86 | (void*)(y), (void*)(z)); \ | |
87 | if ((x) == (y)) \ | |
88 | udelay(5); \ | |
89 | } while (0) | |
1da177e4 LT |
90 | #else |
91 | #define LIST(x,y) | |
92 | #define REMOVE(w,x,y,z) | |
93 | #endif | |
94 | ||
1da177e4 LT |
95 | /* |
96 | * Design | |
1da177e4 | 97 | * |
c28bda25 | 98 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 99 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 100 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
101 | * memory mapped) and drops this file in their 'C' wrapper. |
102 | * | |
c28bda25 | 103 | * As far as command queueing, two queues are maintained for |
1da177e4 | 104 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
105 | * and commands that are currently executing. This means that an |
106 | * unlimited number of commands may be queued, letting | |
107 | * more commands propagate from the higher driver levels giving higher | |
108 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
109 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
110 | * while a command is already executing. |
111 | * | |
1da177e4 | 112 | * |
c28bda25 | 113 | * Issues specific to the NCR5380 : |
1da177e4 | 114 | * |
c28bda25 RZ |
115 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
116 | * piece of hardware that requires you to sit in a loop polling for | |
117 | * the REQ signal as long as you are connected. Some devices are | |
118 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 119 | * while doing long seek operations. [...] These |
1da177e4 LT |
120 | * broken devices are the exception rather than the rule and I'd rather |
121 | * spend my time optimizing for the normal case. | |
122 | * | |
123 | * Architecture : | |
124 | * | |
125 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
126 | * which is started from a workqueue for each NCR5380 host in the |
127 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
128 | * removing the commands from the issue queue and calling | |
129 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
130 | * |
131 | * Once a nexus is established, the NCR5380_information_transfer() | |
132 | * phase goes through the various phases as instructed by the target. | |
133 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
134 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
135 | * queue, and NCR5380_main tries to find more work. If the target is |
136 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
137 | * |
138 | * If a command has disconnected, eventually an interrupt will trigger, | |
139 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
140 | * to reestablish a nexus. This will run main if necessary. | |
141 | * | |
c28bda25 | 142 | * On command termination, the done function will be called as |
1da177e4 LT |
143 | * appropriate. |
144 | * | |
c28bda25 | 145 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
146 | * structures, being initialized after the command is connected |
147 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
148 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
149 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
150 | */ | |
151 | ||
152 | /* | |
153 | * Using this file : | |
154 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 155 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
156 | * and macros and include this file in your driver. |
157 | * | |
c28bda25 | 158 | * These macros control options : |
1da177e4 | 159 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 160 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 161 | * |
ff50f9ed FT |
162 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
163 | * transceivers. | |
164 | * | |
1da177e4 LT |
165 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
166 | * | |
167 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
168 | * | |
169 | * These macros MUST be defined : | |
c28bda25 | 170 | * |
1da177e4 LT |
171 | * NCR5380_read(register) - read from the specified register |
172 | * | |
c28bda25 | 173 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 174 | * |
ff50f9ed FT |
175 | * NCR5380_implementation_fields - additional fields needed for this |
176 | * specific implementation of the NCR5380 | |
177 | * | |
1da177e4 | 178 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 179 | * REAL functions : |
1da177e4 | 180 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 181 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
182 | * that they were able to program the controller for. |
183 | * | |
c28bda25 | 184 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
185 | * available as NCR5380_i386_dma_write_setup, |
186 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
187 | * | |
188 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
189 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
190 | * NCR5380_dma_residual(instance); - residual count | |
191 | * | |
192 | * PSEUDO functions : | |
193 | * NCR5380_pwrite(instance, src, count) | |
194 | * NCR5380_pread(instance, dst, count); | |
195 | * | |
1da177e4 | 196 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 197 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 198 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 199 | * possible) function may be used. |
1da177e4 LT |
200 | */ |
201 | ||
1da177e4 LT |
202 | /* Macros ease life... :-) */ |
203 | #define SETUP_HOSTDATA(in) \ | |
204 | struct NCR5380_hostdata *hostdata = \ | |
205 | (struct NCR5380_hostdata *)(in)->hostdata | |
206 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
207 | ||
710ddd0d | 208 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 209 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 210 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
211 | |
212 | #define HOSTNO instance->host_no | |
213 | #define H_NO(cmd) (cmd)->device->host->host_no | |
214 | ||
636b1ec8 FT |
215 | static int do_abort(struct Scsi_Host *); |
216 | static void do_reset(struct Scsi_Host *); | |
217 | ||
1da177e4 LT |
218 | #ifdef SUPPORT_TAGS |
219 | ||
220 | /* | |
221 | * Functions for handling tagged queuing | |
222 | * ===================================== | |
223 | * | |
224 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
225 | * | |
226 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
227 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
228 | * command has been preempted for a long time. My solution: a bitfield for | |
229 | * remembering used tags. | |
230 | * | |
231 | * There's also the problem that each target has a certain queue size, but we | |
232 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
233 | * returned. So, in this case, the driver internal queue size assumption is | |
234 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
235 | * target. The command is returned to the mid-level, but with status changed | |
236 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL | |
237 | * correctly. | |
238 | * | |
239 | * We're also not allowed running tagged commands as long as an untagged | |
240 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
241 | * condition _must_ be untagged. To keep track whether an untagged command has | |
242 | * been issued, the host->busy array is still employed, as it is without | |
243 | * support for tagged queuing. | |
244 | * | |
245 | * One could suspect that there are possible race conditions between | |
246 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
247 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
248 | * which already guaranteed to be running at most once. It is also the only | |
249 | * place where tags/LUNs are allocated. So no other allocation can slip | |
250 | * between that pair, there could only happen a reselection, which can free a | |
251 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
252 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
253 | */ | |
254 | ||
ca513fc9 | 255 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 256 | { |
c28bda25 | 257 | int target, lun; |
61d739a4 | 258 | struct tag_alloc *ta; |
c28bda25 | 259 | |
ca513fc9 | 260 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
261 | return; |
262 | ||
263 | for (target = 0; target < 8; ++target) { | |
264 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 265 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
266 | bitmap_zero(ta->allocated, MAX_TAGS); |
267 | ta->nr_allocated = 0; | |
268 | /* At the beginning, assume the maximum queue size we could | |
269 | * support (MAX_TAGS). This value will be decreased if the target | |
270 | * returns QUEUE_FULL status. | |
271 | */ | |
272 | ta->queue_size = MAX_TAGS; | |
273 | } | |
1da177e4 | 274 | } |
1da177e4 LT |
275 | } |
276 | ||
277 | ||
278 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
279 | * busy by an untagged command. If the command should use tagged queuing, also | |
280 | * check that there is a free tag and the target's queue won't overflow. This | |
281 | * function should be called with interrupts disabled to avoid race | |
282 | * conditions. | |
c28bda25 | 283 | */ |
1da177e4 | 284 | |
710ddd0d | 285 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 286 | { |
9cb78c16 | 287 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
288 | SETUP_HOSTDATA(cmd->device->host); |
289 | ||
9cb78c16 | 290 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
291 | return 1; |
292 | if (!should_be_tagged || | |
ca513fc9 FT |
293 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
294 | !cmd->device->tagged_supported) | |
c28bda25 | 295 | return 0; |
61d739a4 FT |
296 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
297 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
d65e634a | 298 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
9cb78c16 | 299 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
300 | return 1; |
301 | } | |
302 | return 0; | |
1da177e4 LT |
303 | } |
304 | ||
305 | ||
306 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
307 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
308 | * untagged. | |
309 | */ | |
310 | ||
710ddd0d | 311 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 312 | { |
9cb78c16 | 313 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
314 | SETUP_HOSTDATA(cmd->device->host); |
315 | ||
316 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
317 | * an untagged command. | |
318 | */ | |
319 | if (!should_be_tagged || | |
ca513fc9 FT |
320 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
321 | !cmd->device->tagged_supported) { | |
c28bda25 | 322 | cmd->tag = TAG_NONE; |
9cb78c16 | 323 | hostdata->busy[cmd->device->id] |= (1 << lun); |
d65e634a | 324 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
9cb78c16 | 325 | "command\n", H_NO(cmd), cmd->device->id, lun); |
c28bda25 | 326 | } else { |
61d739a4 | 327 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
328 | |
329 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
330 | set_bit(cmd->tag, ta->allocated); | |
331 | ta->nr_allocated++; | |
d65e634a | 332 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
c28bda25 RZ |
333 | "(now %d tags in use)\n", |
334 | H_NO(cmd), cmd->tag, cmd->device->id, | |
9cb78c16 | 335 | lun, ta->nr_allocated); |
c28bda25 | 336 | } |
1da177e4 LT |
337 | } |
338 | ||
339 | ||
340 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
341 | * unlock the LUN. | |
342 | */ | |
343 | ||
710ddd0d | 344 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 345 | { |
9cb78c16 | 346 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
347 | SETUP_HOSTDATA(cmd->device->host); |
348 | ||
349 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 350 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
d65e634a | 351 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
9cb78c16 | 352 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
353 | } else if (cmd->tag >= MAX_TAGS) { |
354 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
355 | H_NO(cmd), cmd->tag); | |
356 | } else { | |
61d739a4 | 357 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
358 | clear_bit(cmd->tag, ta->allocated); |
359 | ta->nr_allocated--; | |
d65e634a | 360 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
9cb78c16 | 361 | H_NO(cmd), cmd->tag, cmd->device->id, lun); |
c28bda25 | 362 | } |
1da177e4 LT |
363 | } |
364 | ||
365 | ||
ca513fc9 | 366 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 367 | { |
c28bda25 | 368 | int target, lun; |
61d739a4 | 369 | struct tag_alloc *ta; |
c28bda25 | 370 | |
ca513fc9 | 371 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
372 | return; |
373 | ||
374 | for (target = 0; target < 8; ++target) { | |
375 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 376 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
377 | bitmap_zero(ta->allocated, MAX_TAGS); |
378 | ta->nr_allocated = 0; | |
379 | } | |
1da177e4 | 380 | } |
1da177e4 LT |
381 | } |
382 | ||
383 | #endif /* SUPPORT_TAGS */ | |
384 | ||
385 | ||
386 | /* | |
710ddd0d | 387 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
388 | * |
389 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
390 | * transfer. This is possible if the scatter buffers lie on | |
391 | * physical contiguous addresses. | |
392 | * | |
710ddd0d | 393 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 394 | * The command to work on. The first scatter buffer's data are |
25985edc | 395 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
396 | */ |
397 | ||
710ddd0d | 398 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 399 | { |
e3f463b0 | 400 | #if !defined(CONFIG_SUN3) |
c28bda25 | 401 | unsigned long endaddr; |
1da177e4 | 402 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
403 | unsigned long oldlen = cmd->SCp.this_residual; |
404 | int cnt = 1; | |
1da177e4 LT |
405 | #endif |
406 | ||
c28bda25 RZ |
407 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
408 | cmd->SCp.buffers_residual && | |
5a1cb47f | 409 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 410 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 411 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 412 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 413 | ++cnt; |
1da177e4 | 414 | #endif |
c28bda25 RZ |
415 | ++cmd->SCp.buffer; |
416 | --cmd->SCp.buffers_residual; | |
417 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
418 | endaddr += cmd->SCp.buffer->length; | |
419 | } | |
1da177e4 | 420 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 421 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 422 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 423 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 424 | #endif |
e3f463b0 | 425 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
426 | } |
427 | ||
ff50f9ed FT |
428 | /** |
429 | * initialize_SCp - init the scsi pointer field | |
430 | * @cmd: command block to set up | |
1da177e4 | 431 | * |
ff50f9ed | 432 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
433 | */ |
434 | ||
710ddd0d | 435 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 436 | { |
c28bda25 RZ |
437 | /* |
438 | * Initialize the Scsi Pointer field so that all of the commands in the | |
439 | * various queues are valid. | |
1da177e4 | 440 | */ |
c28bda25 | 441 | |
9e0fe44d BH |
442 | if (scsi_bufflen(cmd)) { |
443 | cmd->SCp.buffer = scsi_sglist(cmd); | |
444 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 445 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
446 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
447 | /* ++roman: Try to merge some scatter-buffers if they are at | |
448 | * contiguous physical addresses. | |
449 | */ | |
450 | merge_contiguous_buffers(cmd); | |
451 | } else { | |
452 | cmd->SCp.buffer = NULL; | |
453 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
454 | cmd->SCp.ptr = NULL; |
455 | cmd->SCp.this_residual = 0; | |
c28bda25 | 456 | } |
1da177e4 LT |
457 | } |
458 | ||
636b1ec8 | 459 | /** |
2f854b82 | 460 | * NCR5380_poll_politely - wait for chip register value |
636b1ec8 FT |
461 | * @instance: controller to poll |
462 | * @reg: 5380 register to poll | |
463 | * @bit: Bitmask to check | |
464 | * @val: Value required to exit | |
2f854b82 | 465 | * @wait: Time-out in jiffies |
636b1ec8 | 466 | * |
2f854b82 FT |
467 | * Polls the chip in a reasonably efficient manner waiting for an |
468 | * event to occur. After a short quick poll we begin to yield the CPU | |
469 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
470 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 471 | * |
2f854b82 | 472 | * Returns 0 if event occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
473 | */ |
474 | ||
475 | static int NCR5380_poll_politely(struct Scsi_Host *instance, | |
2f854b82 | 476 | int reg, int bit, int val, int wait) |
636b1ec8 | 477 | { |
2f854b82 FT |
478 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
479 | unsigned long deadline = jiffies + wait; | |
480 | unsigned long n; | |
481 | ||
482 | /* Busy-wait for up to 10 ms */ | |
483 | n = min(10000U, jiffies_to_usecs(wait)); | |
484 | n *= hostdata->accesses_per_ms; | |
485 | n /= 1000; | |
486 | do { | |
487 | if ((NCR5380_read(reg) & bit) == val) | |
636b1ec8 FT |
488 | return 0; |
489 | cpu_relax(); | |
2f854b82 FT |
490 | } while (n--); |
491 | ||
492 | if (irqs_disabled() || in_interrupt()) | |
493 | return -ETIMEDOUT; | |
636b1ec8 | 494 | |
2f854b82 FT |
495 | /* Repeatedly sleep for 1 ms until deadline */ |
496 | while (time_is_after_jiffies(deadline)) { | |
497 | schedule_timeout_uninterruptible(1); | |
498 | if ((NCR5380_read(reg) & bit) == val) | |
636b1ec8 | 499 | return 0; |
636b1ec8 | 500 | } |
2f854b82 | 501 | |
636b1ec8 FT |
502 | return -ETIMEDOUT; |
503 | } | |
504 | ||
1da177e4 LT |
505 | #include <linux/delay.h> |
506 | ||
507 | #if NDEBUG | |
508 | static struct { | |
c28bda25 RZ |
509 | unsigned char mask; |
510 | const char *name; | |
511 | } signals[] = { | |
512 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
513 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
514 | { SR_SEL, "SEL" }, {0, NULL} | |
515 | }, basrs[] = { | |
516 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
517 | }, icrs[] = { | |
518 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
519 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
520 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
521 | {0, NULL} | |
522 | }, mrs[] = { | |
523 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
524 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
525 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
526 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
527 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
528 | {0, NULL} | |
529 | }; | |
1da177e4 | 530 | |
ff50f9ed FT |
531 | /** |
532 | * NCR5380_print - print scsi bus signals | |
533 | * @instance: adapter state to dump | |
1da177e4 | 534 | * |
ff50f9ed | 535 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
536 | */ |
537 | ||
c28bda25 RZ |
538 | static void NCR5380_print(struct Scsi_Host *instance) |
539 | { | |
540 | unsigned char status, data, basr, mr, icr, i; | |
541 | unsigned long flags; | |
542 | ||
543 | local_irq_save(flags); | |
544 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
545 | status = NCR5380_read(STATUS_REG); | |
546 | mr = NCR5380_read(MODE_REG); | |
547 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
548 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
549 | local_irq_restore(flags); | |
550 | printk("STATUS_REG: %02x ", status); | |
551 | for (i = 0; signals[i].mask; ++i) | |
552 | if (status & signals[i].mask) | |
553 | printk(",%s", signals[i].name); | |
554 | printk("\nBASR: %02x ", basr); | |
555 | for (i = 0; basrs[i].mask; ++i) | |
556 | if (basr & basrs[i].mask) | |
557 | printk(",%s", basrs[i].name); | |
558 | printk("\nICR: %02x ", icr); | |
559 | for (i = 0; icrs[i].mask; ++i) | |
560 | if (icr & icrs[i].mask) | |
561 | printk(",%s", icrs[i].name); | |
562 | printk("\nMODE: %02x ", mr); | |
563 | for (i = 0; mrs[i].mask; ++i) | |
564 | if (mr & mrs[i].mask) | |
565 | printk(",%s", mrs[i].name); | |
566 | printk("\n"); | |
1da177e4 LT |
567 | } |
568 | ||
569 | static struct { | |
c28bda25 RZ |
570 | unsigned char value; |
571 | const char *name; | |
1da177e4 | 572 | } phases[] = { |
c28bda25 RZ |
573 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
574 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
575 | {PHASE_UNKNOWN, "UNKNOWN"} | |
576 | }; | |
1da177e4 | 577 | |
ff50f9ed FT |
578 | /** |
579 | * NCR5380_print_phase - show SCSI phase | |
580 | * @instance: adapter to dump | |
1da177e4 | 581 | * |
ff50f9ed | 582 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 583 | * |
ff50f9ed | 584 | * Locks: none |
1da177e4 LT |
585 | */ |
586 | ||
587 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
588 | { | |
c28bda25 RZ |
589 | unsigned char status; |
590 | int i; | |
591 | ||
592 | status = NCR5380_read(STATUS_REG); | |
593 | if (!(status & SR_REQ)) | |
594 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
595 | else { | |
596 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
597 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
598 | ; | |
599 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
600 | } | |
1da177e4 LT |
601 | } |
602 | ||
1da177e4 LT |
603 | #endif |
604 | ||
8c32513b FT |
605 | /** |
606 | * NCR58380_info - report driver and host information | |
607 | * @instance: relevant scsi host instance | |
1da177e4 | 608 | * |
8c32513b | 609 | * For use as the host template info() handler. |
1da177e4 | 610 | * |
8c32513b | 611 | * Locks: none |
1da177e4 LT |
612 | */ |
613 | ||
8c32513b | 614 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 615 | { |
8c32513b FT |
616 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
617 | ||
618 | return hostdata->info; | |
619 | } | |
620 | ||
621 | static void prepare_info(struct Scsi_Host *instance) | |
622 | { | |
623 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
624 | ||
625 | snprintf(hostdata->info, sizeof(hostdata->info), | |
626 | "%s, io_port 0x%lx, n_io_port %d, " | |
627 | "base 0x%lx, irq %d, " | |
628 | "can_queue %d, cmd_per_lun %d, " | |
629 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 630 | "flags { %s%s}, " |
8c32513b FT |
631 | "options { %s} ", |
632 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
633 | instance->base, instance->irq, | |
634 | instance->can_queue, instance->cmd_per_lun, | |
635 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 636 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 637 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
638 | #ifdef DIFFERENTIAL |
639 | "DIFFERENTIAL " | |
640 | #endif | |
1da177e4 | 641 | #ifdef REAL_DMA |
8c32513b | 642 | "REAL_DMA " |
1da177e4 LT |
643 | #endif |
644 | #ifdef PARITY | |
8c32513b | 645 | "PARITY " |
1da177e4 LT |
646 | #endif |
647 | #ifdef SUPPORT_TAGS | |
8c32513b | 648 | "SUPPORT_TAGS " |
1da177e4 | 649 | #endif |
8c32513b | 650 | ""); |
1da177e4 LT |
651 | } |
652 | ||
ff50f9ed FT |
653 | /** |
654 | * NCR5380_print_status - dump controller info | |
655 | * @instance: controller to dump | |
1da177e4 | 656 | * |
ff50f9ed FT |
657 | * Print commands in the various queues, called from NCR5380_abort |
658 | * to aid debugging. | |
1da177e4 LT |
659 | */ |
660 | ||
710ddd0d | 661 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd) |
1da177e4 | 662 | { |
d89537e1 AV |
663 | int i, s; |
664 | unsigned char *command; | |
9cb78c16 | 665 | printk("scsi%d: destination target %d, lun %llu\n", |
d89537e1 AV |
666 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
667 | printk(KERN_CONT " command = "); | |
668 | command = cmd->cmnd; | |
669 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
670 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
671 | printk(KERN_CONT " %02x", command[i]); | |
672 | printk("\n"); | |
1da177e4 LT |
673 | } |
674 | ||
3be1b3ea | 675 | static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 676 | { |
c28bda25 | 677 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 678 | struct scsi_cmnd *ptr; |
c28bda25 | 679 | unsigned long flags; |
d89537e1 | 680 | |
8ad3a593 FT |
681 | NCR5380_dprint(NDEBUG_ANY, instance); |
682 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
c28bda25 RZ |
683 | |
684 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
685 | ||
c28bda25 | 686 | local_irq_save(flags); |
c28bda25 | 687 | if (!hostdata->connected) |
d89537e1 | 688 | printk("scsi%d: no currently connected command\n", HOSTNO); |
c28bda25 | 689 | else |
710ddd0d | 690 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected); |
d89537e1 | 691 | printk("scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 692 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 | 693 | lprint_Scsi_Cmnd(ptr); |
1da177e4 | 694 | |
d89537e1 | 695 | printk("scsi%d: disconnected_queue\n", HOSTNO); |
710ddd0d | 696 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
697 | ptr = NEXT(ptr)) |
698 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 699 | |
c28bda25 | 700 | local_irq_restore(flags); |
d89537e1 | 701 | printk("\n"); |
1da177e4 LT |
702 | } |
703 | ||
710ddd0d | 704 | static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 705 | { |
c28bda25 RZ |
706 | int i, s; |
707 | unsigned char *command; | |
9cb78c16 | 708 | seq_printf(m, "scsi%d: destination target %d, lun %llu\n", |
c28bda25 | 709 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
91c40f24 | 710 | seq_puts(m, " command = "); |
c28bda25 | 711 | command = cmd->cmnd; |
d89537e1 | 712 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); |
c28bda25 | 713 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
d89537e1 | 714 | seq_printf(m, " %02x", command[i]); |
f50332ff | 715 | seq_putc(m, '\n'); |
1da177e4 LT |
716 | } |
717 | ||
4d3d2a54 FT |
718 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
719 | struct Scsi_Host *instance) | |
d89537e1 AV |
720 | { |
721 | struct NCR5380_hostdata *hostdata; | |
710ddd0d | 722 | struct scsi_cmnd *ptr; |
d89537e1 AV |
723 | unsigned long flags; |
724 | ||
725 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
726 | ||
d89537e1 | 727 | local_irq_save(flags); |
d89537e1 AV |
728 | if (!hostdata->connected) |
729 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
730 | else | |
710ddd0d | 731 | show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
d89537e1 | 732 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 733 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 AV |
734 | show_Scsi_Cmnd(ptr, m); |
735 | ||
736 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
710ddd0d | 737 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
738 | ptr = NEXT(ptr)) |
739 | show_Scsi_Cmnd(ptr, m); | |
740 | ||
741 | local_irq_restore(flags); | |
742 | return 0; | |
743 | } | |
1da177e4 | 744 | |
ff50f9ed FT |
745 | /** |
746 | * NCR5380_init - initialise an NCR5380 | |
747 | * @instance: adapter to configure | |
748 | * @flags: control flags | |
1da177e4 | 749 | * |
ff50f9ed FT |
750 | * Initializes *instance and corresponding 5380 chip, |
751 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
752 | * |
753 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 754 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 755 | * |
ff50f9ed | 756 | * Returns 0 for success |
1da177e4 LT |
757 | */ |
758 | ||
95fde7a8 | 759 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 760 | { |
c28bda25 RZ |
761 | int i; |
762 | SETUP_HOSTDATA(instance); | |
2f854b82 | 763 | unsigned long deadline; |
c28bda25 | 764 | |
a53a21e4 | 765 | hostdata->host = instance; |
c28bda25 RZ |
766 | hostdata->id_mask = 1 << instance->this_id; |
767 | hostdata->id_higher_mask = 0; | |
768 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
769 | if (i > hostdata->id_mask) | |
770 | hostdata->id_higher_mask |= i; | |
771 | for (i = 0; i < 8; ++i) | |
772 | hostdata->busy[i] = 0; | |
1da177e4 | 773 | #ifdef SUPPORT_TAGS |
ca513fc9 | 774 | init_tags(hostdata); |
1da177e4 LT |
775 | #endif |
776 | #if defined (REAL_DMA) | |
c28bda25 | 777 | hostdata->dma_len = 0; |
1da177e4 | 778 | #endif |
c28bda25 RZ |
779 | hostdata->connected = NULL; |
780 | hostdata->issue_queue = NULL; | |
781 | hostdata->disconnected_queue = NULL; | |
ef1081cb | 782 | hostdata->flags = flags; |
c28bda25 | 783 | |
a53a21e4 | 784 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
785 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
786 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
787 | 1, instance->host_no); | |
788 | if (!hostdata->work_q) | |
789 | return -ENOMEM; | |
1da177e4 | 790 | |
8c32513b FT |
791 | prepare_info(instance); |
792 | ||
c28bda25 RZ |
793 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
794 | NCR5380_write(MODE_REG, MR_BASE); | |
795 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
796 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 797 | |
2f854b82 FT |
798 | /* Calibrate register polling loop */ |
799 | i = 0; | |
800 | deadline = jiffies + 1; | |
801 | do { | |
802 | cpu_relax(); | |
803 | } while (time_is_after_jiffies(deadline)); | |
804 | deadline += msecs_to_jiffies(256); | |
805 | do { | |
806 | NCR5380_read(STATUS_REG); | |
807 | ++i; | |
808 | cpu_relax(); | |
809 | } while (time_is_after_jiffies(deadline)); | |
810 | hostdata->accesses_per_ms = i / 256; | |
811 | ||
c28bda25 | 812 | return 0; |
1da177e4 LT |
813 | } |
814 | ||
636b1ec8 FT |
815 | /** |
816 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
817 | * @instance: adapter to check | |
818 | * | |
819 | * If the system crashed, it may have crashed with a connected target and | |
820 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
821 | * currently established nexus, which we know nothing about. Failing that | |
822 | * do a bus reset. | |
823 | * | |
824 | * Note that a bus reset will cause the chip to assert IRQ. | |
825 | * | |
826 | * Returns 0 if successful, otherwise -ENXIO. | |
827 | */ | |
828 | ||
829 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
830 | { | |
9c3f0e2b | 831 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
832 | int pass; |
833 | ||
834 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
835 | switch (pass) { | |
836 | case 1: | |
837 | case 3: | |
838 | case 5: | |
839 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
840 | NCR5380_poll_politely(instance, | |
841 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
842 | break; | |
843 | case 2: | |
844 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
845 | do_abort(instance); | |
846 | break; | |
847 | case 4: | |
848 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
849 | do_reset(instance); | |
9c3f0e2b FT |
850 | /* Wait after a reset; the SCSI standard calls for |
851 | * 250ms, we wait 500ms to be on the safe side. | |
852 | * But some Toshiba CD-ROMs need ten times that. | |
853 | */ | |
854 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
855 | msleep(2500); | |
856 | else | |
857 | msleep(500); | |
636b1ec8 FT |
858 | break; |
859 | case 6: | |
860 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
861 | return -ENXIO; | |
862 | } | |
863 | } | |
864 | return 0; | |
865 | } | |
866 | ||
ff50f9ed FT |
867 | /** |
868 | * NCR5380_exit - remove an NCR5380 | |
869 | * @instance: adapter to remove | |
870 | * | |
871 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
872 | */ | |
873 | ||
6323e4fe GU |
874 | static void NCR5380_exit(struct Scsi_Host *instance) |
875 | { | |
a53a21e4 FT |
876 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
877 | ||
878 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 879 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
880 | } |
881 | ||
ff50f9ed FT |
882 | /** |
883 | * NCR5380_queue_command - queue a command | |
884 | * @instance: the relevant SCSI adapter | |
885 | * @cmd: SCSI command | |
1da177e4 | 886 | * |
1bb40589 | 887 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
888 | * twiddling done to the host specific fields of cmd. If the |
889 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
890 | */ |
891 | ||
16b29e75 FT |
892 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
893 | struct scsi_cmnd *cmd) | |
1da177e4 | 894 | { |
16b29e75 | 895 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 896 | struct scsi_cmnd *tmp; |
c28bda25 | 897 | unsigned long flags; |
1da177e4 LT |
898 | |
899 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
900 | switch (cmd->cmnd[0]) { |
901 | case WRITE_6: | |
902 | case WRITE_10: | |
903 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | |
904 | H_NO(cmd)); | |
905 | cmd->result = (DID_ERROR << 16); | |
16b29e75 | 906 | cmd->scsi_done(cmd); |
c28bda25 RZ |
907 | return 0; |
908 | } | |
1da177e4 LT |
909 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
910 | ||
c28bda25 RZ |
911 | /* |
912 | * We use the host_scribble field as a pointer to the next command | |
913 | * in a queue | |
914 | */ | |
915 | ||
3130d905 | 916 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
917 | cmd->result = 0; |
918 | ||
919 | /* | |
920 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
921 | * commands are added to the head of the queue since any command will | |
922 | * clear the contingent allegiance condition that exists and the | |
923 | * sense data is only guaranteed to be valid while the condition exists. | |
924 | */ | |
925 | ||
c28bda25 RZ |
926 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
927 | * Otherwise a running NCR5380_main may steal the lock. | |
928 | * Lock before actually inserting due to fairness reasons explained in | |
929 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
930 | * to release the lock. | |
931 | * Stop timer for this command while waiting for the lock, or timeouts | |
932 | * may happen (and they really do), and it's no good if the command doesn't | |
933 | * appear in any of the queues. | |
934 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
935 | * because also a timer int can trigger an abort or reset, which would | |
936 | * alter queues and touch the lock. | |
937 | */ | |
e3c3da67 | 938 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
939 | return SCSI_MLQUEUE_HOST_BUSY; |
940 | ||
941 | local_irq_save(flags); | |
942 | ||
ff50f9ed FT |
943 | /* |
944 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
945 | * commands are added to the head of the queue since any command will | |
946 | * clear the contingent allegiance condition that exists and the | |
947 | * sense data is only guaranteed to be valid while the condition exists. | |
948 | */ | |
949 | ||
c28bda25 RZ |
950 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
951 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 952 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
953 | hostdata->issue_queue = cmd; |
954 | } else { | |
710ddd0d | 955 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
956 | NEXT(tmp); tmp = NEXT(tmp)) |
957 | ; | |
958 | LIST(cmd, tmp); | |
3130d905 | 959 | SET_NEXT(tmp, cmd); |
c28bda25 RZ |
960 | } |
961 | local_irq_restore(flags); | |
962 | ||
d65e634a | 963 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
c28bda25 RZ |
964 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
965 | ||
010e89d1 FT |
966 | /* Kick off command processing */ |
967 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 968 | return 0; |
1da177e4 LT |
969 | } |
970 | ||
e3c3da67 FT |
971 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
972 | { | |
973 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
974 | ||
975 | /* Caller does the locking needed to set & test these data atomically */ | |
976 | if (!hostdata->disconnected_queue && | |
977 | !hostdata->issue_queue && | |
978 | !hostdata->connected && | |
979 | !hostdata->retain_dma_intr) | |
980 | NCR5380_release_dma_irq(instance); | |
981 | } | |
982 | ||
ff50f9ed FT |
983 | /** |
984 | * NCR5380_main - NCR state machines | |
1da177e4 | 985 | * |
ff50f9ed FT |
986 | * NCR5380_main is a coroutine that runs as long as more work can |
987 | * be done on the NCR5380 host adapters in a system. Both | |
988 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
989 | * in case it is not running. | |
c28bda25 | 990 | * |
ff50f9ed | 991 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
992 | */ |
993 | ||
b312b38c | 994 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 995 | { |
a53a21e4 FT |
996 | struct NCR5380_hostdata *hostdata = |
997 | container_of(work, struct NCR5380_hostdata, main_task); | |
998 | struct Scsi_Host *instance = hostdata->host; | |
710ddd0d | 999 | struct scsi_cmnd *tmp, *prev; |
c28bda25 RZ |
1000 | int done; |
1001 | unsigned long flags; | |
1002 | ||
1003 | /* | |
c28bda25 RZ |
1004 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
1005 | * because also a timer int can trigger an abort or reset, which can | |
1006 | * alter queues and touch the Falcon lock. | |
1007 | */ | |
1008 | ||
c28bda25 RZ |
1009 | local_save_flags(flags); |
1010 | do { | |
1011 | local_irq_disable(); /* Freeze request queues */ | |
1012 | done = 1; | |
1013 | ||
1014 | if (!hostdata->connected) { | |
d65e634a | 1015 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
1016 | /* |
1017 | * Search through the issue_queue for a command destined | |
1018 | * for a target that's not busy. | |
1019 | */ | |
1da177e4 | 1020 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 1021 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
1022 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
1023 | ; | |
1024 | /*printk("%p ", tmp);*/ | |
1025 | if ((tmp == prev) && tmp) | |
1026 | printk(" LOOP\n"); | |
1027 | /* else printk("\n"); */ | |
1da177e4 | 1028 | #endif |
710ddd0d | 1029 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 1030 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 1031 | u8 lun = tmp->device->lun; |
1da177e4 | 1032 | |
e3f463b0 FT |
1033 | dprintk(NDEBUG_LISTS, |
1034 | "MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
1035 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], | |
1036 | lun); | |
c28bda25 RZ |
1037 | /* When we find one, remove it from the issue queue. */ |
1038 | /* ++guenther: possible race with Falcon locking */ | |
1039 | if ( | |
1da177e4 | 1040 | #ifdef SUPPORT_TAGS |
c28bda25 | 1041 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 1042 | #else |
9cb78c16 | 1043 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 1044 | #endif |
c28bda25 RZ |
1045 | ) { |
1046 | /* ++guenther: just to be sure, this must be atomic */ | |
1047 | local_irq_disable(); | |
1048 | if (prev) { | |
1049 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 1050 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
1051 | } else { |
1052 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1053 | hostdata->issue_queue = NEXT(tmp); | |
1054 | } | |
3130d905 | 1055 | SET_NEXT(tmp, NULL); |
ef1081cb | 1056 | hostdata->retain_dma_intr++; |
c28bda25 RZ |
1057 | |
1058 | /* reenable interrupts after finding one */ | |
1059 | local_irq_restore(flags); | |
1060 | ||
1061 | /* | |
1062 | * Attempt to establish an I_T_L nexus here. | |
1063 | * On success, instance->hostdata->connected is set. | |
1064 | * On failure, we must add the command back to the | |
1065 | * issue queue so we can keep trying. | |
1066 | */ | |
d65e634a | 1067 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 1068 | "lun %d removed from issue_queue\n", |
9cb78c16 | 1069 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
1070 | /* |
1071 | * REQUEST SENSE commands are issued without tagged | |
1072 | * queueing, even on SCSI-II devices because the | |
1073 | * contingent allegiance condition exists for the | |
1074 | * entire unit. | |
1075 | */ | |
1076 | /* ++roman: ...and the standard also requires that | |
1077 | * REQUEST SENSE command are untagged. | |
1078 | */ | |
1079 | ||
1da177e4 | 1080 | #ifdef SUPPORT_TAGS |
c28bda25 | 1081 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1082 | #endif |
76f13b93 | 1083 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 1084 | /* OK or bad target */ |
e3c3da67 | 1085 | local_irq_disable(); |
ef1081cb | 1086 | hostdata->retain_dma_intr--; |
e3c3da67 FT |
1087 | maybe_release_dma_irq(instance); |
1088 | local_irq_restore(flags); | |
c28bda25 | 1089 | } else { |
1f1b0c74 | 1090 | /* Need to retry */ |
c28bda25 RZ |
1091 | local_irq_disable(); |
1092 | LIST(tmp, hostdata->issue_queue); | |
3130d905 | 1093 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 1094 | hostdata->issue_queue = tmp; |
1da177e4 | 1095 | #ifdef SUPPORT_TAGS |
c28bda25 | 1096 | cmd_free_tag(tmp); |
1da177e4 | 1097 | #endif |
ef1081cb | 1098 | hostdata->retain_dma_intr--; |
c28bda25 | 1099 | local_irq_restore(flags); |
1d3db59d | 1100 | done = 0; |
d65e634a | 1101 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 | 1102 | "returned to issue_queue\n", HOSTNO); |
c28bda25 | 1103 | } |
1f1b0c74 FT |
1104 | if (hostdata->connected) |
1105 | break; | |
c28bda25 RZ |
1106 | } /* if target/lun/target queue is not busy */ |
1107 | } /* for issue_queue */ | |
1108 | } /* if (!hostdata->connected) */ | |
1109 | ||
1110 | if (hostdata->connected | |
1da177e4 | 1111 | #ifdef REAL_DMA |
c28bda25 | 1112 | && !hostdata->dma_len |
1da177e4 | 1113 | #endif |
c28bda25 RZ |
1114 | ) { |
1115 | local_irq_restore(flags); | |
d65e634a | 1116 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1117 | HOSTNO); |
1118 | NCR5380_information_transfer(instance); | |
d65e634a | 1119 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1120 | done = 0; |
1121 | } | |
1122 | } while (!done); | |
c28bda25 | 1123 | local_irq_restore(flags); |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | ||
1127 | #ifdef REAL_DMA | |
1128 | /* | |
1129 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1130 | * | |
1131 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1132 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1133 | * |
1134 | * Inputs : instance - this instance of the NCR5380. | |
1135 | * | |
1136 | */ | |
1137 | ||
c28bda25 | 1138 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1139 | { |
c28bda25 | 1140 | SETUP_HOSTDATA(instance); |
01bd9081 | 1141 | int transferred; |
e3f463b0 | 1142 | unsigned char **data; |
c28bda25 | 1143 | volatile int *count; |
e3f463b0 FT |
1144 | int saved_data = 0, overrun = 0; |
1145 | unsigned char p; | |
c28bda25 RZ |
1146 | |
1147 | if (!hostdata->connected) { | |
1148 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | |
1149 | "no connected cmd\n", HOSTNO); | |
1150 | return; | |
1da177e4 | 1151 | } |
c28bda25 | 1152 | |
ef1081cb | 1153 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1154 | p = hostdata->connected->SCp.phase; |
1155 | if (p & SR_IO) { | |
1156 | udelay(10); | |
1157 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1158 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1159 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1160 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1161 | overrun = 1; | |
d65e634a | 1162 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1163 | } |
1164 | } | |
1165 | } | |
1166 | ||
d65e634a | 1167 | dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
c28bda25 RZ |
1168 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
1169 | NCR5380_read(STATUS_REG)); | |
1170 | ||
e3f463b0 FT |
1171 | #if defined(CONFIG_SUN3) |
1172 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1173 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1174 | instance->host_no); | |
1175 | BUG(); | |
1176 | } | |
1177 | ||
1178 | /* make sure we're not stuck in a data phase */ | |
1179 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1180 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1181 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1182 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1183 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1184 | instance->host_no); | |
1185 | BUG(); | |
1186 | } | |
1187 | #endif | |
1188 | ||
c28bda25 RZ |
1189 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1190 | NCR5380_write(MODE_REG, MR_BASE); | |
1191 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1192 | ||
01bd9081 | 1193 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1194 | hostdata->dma_len = 0; |
1195 | ||
1196 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1197 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1198 | *data += transferred; |
1199 | *count -= transferred; | |
c28bda25 | 1200 | |
ef1081cb | 1201 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1202 | int cnt, toPIO; |
1203 | ||
c28bda25 | 1204 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1205 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1206 | if (overrun) { |
d65e634a | 1207 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1208 | *(*data)++ = saved_data; |
1209 | (*count)--; | |
1210 | cnt--; | |
1211 | toPIO--; | |
1212 | } | |
d65e634a | 1213 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1214 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1215 | *count -= toPIO - cnt; | |
1216 | } | |
1da177e4 | 1217 | } |
1da177e4 LT |
1218 | } |
1219 | #endif /* REAL_DMA */ | |
1220 | ||
1221 | ||
ff50f9ed FT |
1222 | /** |
1223 | * NCR5380_intr - generic NCR5380 irq handler | |
1224 | * @irq: interrupt number | |
1225 | * @dev_id: device info | |
1da177e4 | 1226 | * |
ff50f9ed FT |
1227 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1228 | * from the disconnected queue, and restarting NCR5380_main() | |
1229 | * as required. | |
1da177e4 LT |
1230 | */ |
1231 | ||
c28bda25 | 1232 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1233 | { |
a53a21e4 | 1234 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1235 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1236 | int done = 1, handled = 0; |
1237 | unsigned char basr; | |
1238 | ||
d65e634a | 1239 | dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO); |
c28bda25 RZ |
1240 | |
1241 | /* Look for pending interrupts */ | |
1242 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
d65e634a | 1243 | dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr); |
c28bda25 RZ |
1244 | /* dispatch to appropriate routine if found and done=0 */ |
1245 | if (basr & BASR_IRQ) { | |
8ad3a593 | 1246 | NCR5380_dprint(NDEBUG_INTR, instance); |
c28bda25 RZ |
1247 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
1248 | done = 0; | |
d65e634a | 1249 | dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO); |
c28bda25 RZ |
1250 | NCR5380_reselect(instance); |
1251 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1252 | } else if (basr & BASR_PARITY_ERROR) { | |
d65e634a | 1253 | dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO); |
c28bda25 RZ |
1254 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1255 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
d65e634a | 1256 | dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO); |
c28bda25 RZ |
1257 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1258 | } else { | |
1259 | /* | |
1260 | * The rest of the interrupt conditions can occur only during a | |
1261 | * DMA transfer | |
1262 | */ | |
1da177e4 LT |
1263 | |
1264 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1265 | /* |
1266 | * We should only get PHASE MISMATCH and EOP interrupts if we have | |
1267 | * DMA enabled, so do a sanity check based on the current setting | |
1268 | * of the MODE register. | |
1269 | */ | |
1270 | ||
1271 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | |
1272 | ((basr & BASR_END_DMA_TRANSFER) || | |
1273 | !(basr & BASR_PHASE_MATCH))) { | |
1274 | ||
d65e634a | 1275 | dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
c28bda25 RZ |
1276 | NCR5380_dma_complete( instance ); |
1277 | done = 0; | |
c28bda25 | 1278 | } else |
1da177e4 | 1279 | #endif /* REAL_DMA */ |
c28bda25 | 1280 | { |
1da177e4 | 1281 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
c28bda25 | 1282 | if (basr & BASR_PHASE_MATCH) |
e3f463b0 | 1283 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt, " |
c28bda25 RZ |
1284 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", |
1285 | HOSTNO, basr, NCR5380_read(MODE_REG), | |
1286 | NCR5380_read(STATUS_REG)); | |
1287 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
e3f463b0 FT |
1288 | #ifdef SUN3_SCSI_VME |
1289 | dregs->csr |= CSR_DMA_ENABLE; | |
1290 | #endif | |
c28bda25 RZ |
1291 | } |
1292 | } /* if !(SELECTION || PARITY) */ | |
1293 | handled = 1; | |
1294 | } /* BASR & IRQ */ else { | |
1295 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | |
1296 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | |
1297 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | |
1298 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
e3f463b0 FT |
1299 | #ifdef SUN3_SCSI_VME |
1300 | dregs->csr |= CSR_DMA_ENABLE; | |
1301 | #endif | |
c28bda25 RZ |
1302 | } |
1303 | ||
010e89d1 FT |
1304 | if (!done) |
1305 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1306 | ||
c28bda25 | 1307 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1308 | } |
1309 | ||
c28bda25 | 1310 | /* |
710ddd0d FT |
1311 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1312 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1313 | * |
1314 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1315 | * including ARBITRATION, SELECTION, and initial message out for |
1316 | * IDENTIFY and queue messages. | |
1da177e4 | 1317 | * |
c28bda25 | 1318 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1319 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1320 | * |
6323876f FT |
1321 | * Returns : -1 if selection failed but should be retried. |
1322 | * 0 if selection failed and should not be retried. | |
1323 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1324 | * |
c28bda25 RZ |
1325 | * Side effects : |
1326 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1327 | * with registers as they should have been on entry - ie |
1328 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1329 | * will cease to drive any SCSI bus signals. | |
1330 | * | |
c28bda25 RZ |
1331 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1332 | * instance->connected will be set to cmd. | |
1333 | * SELECT interrupt will be disabled. | |
1da177e4 | 1334 | * |
c28bda25 | 1335 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1336 | * cmd->result host byte set to DID_BAD_TARGET. |
1337 | */ | |
1338 | ||
710ddd0d | 1339 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1340 | { |
c28bda25 RZ |
1341 | SETUP_HOSTDATA(instance); |
1342 | unsigned char tmp[3], phase; | |
1343 | unsigned char *data; | |
1344 | int len; | |
ae753a33 | 1345 | int err; |
c28bda25 | 1346 | unsigned long flags; |
55500d9b | 1347 | unsigned long timeout; |
c28bda25 | 1348 | |
8ad3a593 | 1349 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1350 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1351 | instance->this_id); |
1352 | ||
1353 | /* | |
1354 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1355 | * data bus during SELECTION. | |
1356 | */ | |
1357 | ||
1358 | local_irq_save(flags); | |
1359 | if (hostdata->connected) { | |
1360 | local_irq_restore(flags); | |
1361 | return -1; | |
1362 | } | |
1363 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1364 | |
c28bda25 RZ |
1365 | /* |
1366 | * Start arbitration. | |
1367 | */ | |
1da177e4 | 1368 | |
c28bda25 RZ |
1369 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1370 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1371 | |
55500d9b FT |
1372 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1373 | * Bus Free Delay, arbitration will begin. | |
1374 | */ | |
c28bda25 | 1375 | |
55500d9b FT |
1376 | local_irq_restore(flags); |
1377 | timeout = jiffies + HZ; | |
1378 | while (1) { | |
1379 | if (time_is_before_jiffies(timeout)) { | |
c28bda25 | 1380 | NCR5380_write(MODE_REG, MR_BASE); |
55500d9b FT |
1381 | shost_printk(KERN_ERR, instance, |
1382 | "select: arbitration timeout\n"); | |
c28bda25 RZ |
1383 | return -1; |
1384 | } | |
55500d9b FT |
1385 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1386 | /* Reselection interrupt */ | |
1387 | return -1; | |
1388 | } | |
1389 | if (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) | |
1390 | break; | |
c28bda25 | 1391 | } |
c28bda25 | 1392 | |
55500d9b | 1393 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1394 | udelay(3); |
1395 | ||
1396 | /* Check for lost arbitration */ | |
1397 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1398 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1399 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1400 | hostdata->connected) { | |
1401 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1402 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 RZ |
1403 | HOSTNO); |
1404 | return -1; | |
1405 | } | |
1da177e4 | 1406 | |
cf13b083 FT |
1407 | /* After/during arbitration, BSY should be asserted. |
1408 | * IBM DPES-31080 Version S31Q works now | |
1409 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1410 | */ | |
c28bda25 RZ |
1411 | NCR5380_write(INITIATOR_COMMAND_REG, |
1412 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1413 | ||
1414 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1415 | hostdata->connected) { | |
1416 | NCR5380_write(MODE_REG, MR_BASE); | |
1417 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
d65e634a | 1418 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
c28bda25 RZ |
1419 | HOSTNO); |
1420 | return -1; | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1425 | * a minimum so we'll udelay ceil(1.2) | |
1426 | */ | |
1da177e4 | 1427 | |
9c3f0e2b FT |
1428 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1429 | udelay(15); | |
1430 | else | |
1431 | udelay(2); | |
c28bda25 RZ |
1432 | |
1433 | if (hostdata->connected) { | |
1434 | NCR5380_write(MODE_REG, MR_BASE); | |
1435 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1436 | return -1; | |
1437 | } | |
1438 | ||
d65e634a | 1439 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1440 | |
1441 | /* | |
1442 | * Now that we have won arbitration, start Selection process, asserting | |
1443 | * the host and target ID's on the SCSI bus. | |
1444 | */ | |
1445 | ||
1446 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1447 | ||
1448 | /* | |
1449 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1450 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1451 | * phase immediately after selection. | |
1452 | */ | |
1453 | ||
1454 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1455 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1456 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1457 | |
c28bda25 RZ |
1458 | /* |
1459 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1460 | * otherwise we will trigger an interrupt. | |
1461 | */ | |
1462 | ||
1463 | if (hostdata->connected) { | |
1464 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1465 | return -1; | |
1466 | } | |
1467 | ||
1468 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 1469 | |
c28bda25 RZ |
1470 | /* |
1471 | * The initiator shall then wait at least two deskew delays and release | |
1472 | * the BSY signal. | |
1473 | */ | |
1474 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1475 | ||
1476 | /* Reset BSY */ | |
1477 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1478 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1479 | ||
1480 | /* | |
1481 | * Something weird happens when we cease to drive BSY - looks | |
1482 | * like the board/chip is letting us do another read before the | |
1483 | * appropriate propagation delay has expired, and we're confusing | |
1484 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1485 | * | |
1486 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1487 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1488 | * tighter 'C' code breaks and requires this) solves the problem - | |
1489 | * the 1 us delay is arbitrary, and only used because this delay will | |
1490 | * be the same on other platforms and since it works here, it should | |
1491 | * work there. | |
1492 | * | |
1493 | * wingel suggests that this could be due to failing to wait | |
1494 | * one deskew delay. | |
1495 | */ | |
1da177e4 | 1496 | |
c28bda25 | 1497 | udelay(1); |
1da177e4 | 1498 | |
d65e634a | 1499 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1500 | |
c28bda25 RZ |
1501 | /* |
1502 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1503 | * selection. | |
1504 | */ | |
1da177e4 | 1505 | |
ae753a33 FT |
1506 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1507 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1508 | |
1509 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1510 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1511 | NCR5380_reselect(instance); | |
1512 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", | |
1513 | HOSTNO); | |
1514 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1515 | return -1; | |
1516 | } | |
1da177e4 | 1517 | |
ae753a33 | 1518 | if (err < 0) { |
c28bda25 | 1519 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1520 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1521 | #ifdef SUPPORT_TAGS |
c28bda25 | 1522 | cmd_free_tag(cmd); |
1da177e4 | 1523 | #endif |
c28bda25 RZ |
1524 | cmd->scsi_done(cmd); |
1525 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1526 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1527 | return 0; |
1528 | } | |
1529 | ||
ae753a33 FT |
1530 | /* |
1531 | * No less than two deskew delays after the initiator detects the | |
1532 | * BSY signal is true, it shall release the SEL signal and may | |
1533 | * change the DATA BUS. -wingel | |
1534 | */ | |
1535 | ||
1536 | udelay(1); | |
1537 | ||
1538 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1539 | ||
c28bda25 RZ |
1540 | /* |
1541 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1542 | * was true but before BSY was false during selection, the information | |
1543 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1544 | * IDENTIFY message. | |
1545 | * | |
1546 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1547 | * message (2 bytes) with a tag ID that we increment with every command | |
1548 | * until it wraps back to 0. | |
1549 | * | |
1550 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1551 | * which claim to support tagged queuing but fail when more than | |
1552 | * some number of commands are issued at once. | |
1553 | */ | |
1554 | ||
1555 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1556 | |
1557 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
1558 | if (err < 0) { | |
1559 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1560 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1561 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1562 | return -1; | |
1563 | } | |
c28bda25 | 1564 | |
d65e634a | 1565 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1566 | HOSTNO, cmd->device->id); |
1567 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1568 | |
1569 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1570 | if (cmd->tag != TAG_NONE) { |
1571 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1572 | tmp[2] = cmd->tag; | |
1573 | len = 3; | |
1574 | } else | |
1575 | len = 1; | |
1da177e4 | 1576 | #else |
c28bda25 RZ |
1577 | len = 1; |
1578 | cmd->tag = 0; | |
1da177e4 LT |
1579 | #endif /* SUPPORT_TAGS */ |
1580 | ||
c28bda25 RZ |
1581 | /* Send message(s) */ |
1582 | data = tmp; | |
1583 | phase = PHASE_MSGOUT; | |
1584 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1585 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 RZ |
1586 | /* XXX need to handle errors here */ |
1587 | hostdata->connected = cmd; | |
1da177e4 | 1588 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1589 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1590 | #endif | |
e3f463b0 FT |
1591 | #ifdef SUN3_SCSI_VME |
1592 | dregs->csr |= CSR_INTR; | |
1593 | #endif | |
1da177e4 | 1594 | |
c28bda25 | 1595 | initialize_SCp(cmd); |
1da177e4 | 1596 | |
c28bda25 | 1597 | return 0; |
1da177e4 LT |
1598 | } |
1599 | ||
c28bda25 RZ |
1600 | /* |
1601 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1602 | * unsigned char *phase, int *count, unsigned char **data) |
1603 | * | |
1604 | * Purpose : transfers data in given phase using polled I/O | |
1605 | * | |
c28bda25 RZ |
1606 | * Inputs : instance - instance of driver, *phase - pointer to |
1607 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1608 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1609 | * |
1da177e4 | 1610 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1611 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1612 | * is in same phase. |
1613 | * | |
c28bda25 | 1614 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1615 | * |
1616 | * XXX Note : handling for bus free may be useful. | |
1617 | */ | |
1618 | ||
1619 | /* | |
c28bda25 | 1620 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1621 | * IS 100% reliable, and for the actual data transfer where speed |
1622 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1623 | */ | |
1624 | ||
c28bda25 RZ |
1625 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1626 | unsigned char *phase, int *count, | |
1627 | unsigned char **data) | |
1da177e4 | 1628 | { |
c28bda25 RZ |
1629 | register unsigned char p = *phase, tmp; |
1630 | register int c = *count; | |
1631 | register unsigned char *d = *data; | |
1632 | ||
1633 | /* | |
1634 | * The NCR5380 chip will only drive the SCSI bus when the | |
1635 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1636 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1637 | */ |
1da177e4 | 1638 | |
c28bda25 | 1639 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1640 | |
c28bda25 RZ |
1641 | do { |
1642 | /* | |
1643 | * Wait for assertion of REQ, after which the phase bits will be | |
1644 | * valid | |
1645 | */ | |
686f3990 FT |
1646 | |
1647 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1648 | break; | |
1da177e4 | 1649 | |
d65e634a | 1650 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1651 | |
c28bda25 | 1652 | /* Check for phase mismatch */ |
686f3990 | 1653 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1654 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1655 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1656 | break; |
1657 | } | |
1da177e4 | 1658 | |
c28bda25 RZ |
1659 | /* Do actual transfer from SCSI bus to / from memory */ |
1660 | if (!(p & SR_IO)) | |
1661 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1662 | else | |
1663 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1664 | |
c28bda25 | 1665 | ++d; |
1da177e4 | 1666 | |
c28bda25 RZ |
1667 | /* |
1668 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1669 | * should drop ATN on the last byte of the message phase | |
1670 | * after REQ has been asserted for the handshake but before | |
1671 | * the initiator raises ACK. | |
1672 | */ | |
1da177e4 | 1673 | |
c28bda25 RZ |
1674 | if (!(p & SR_IO)) { |
1675 | if (!((p & SR_MSG) && c > 1)) { | |
1676 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1677 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1678 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1679 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1680 | } else { | |
1681 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1682 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1683 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1684 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1685 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1686 | } | |
1687 | } else { | |
8ad3a593 | 1688 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1689 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1690 | } | |
1da177e4 | 1691 | |
a2edc4a6 FT |
1692 | if (NCR5380_poll_politely(instance, |
1693 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1694 | break; | |
c28bda25 | 1695 | |
d65e634a | 1696 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1697 | |
1698 | /* | |
1699 | * We have several special cases to consider during REQ/ACK handshaking : | |
1700 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1701 | * message. ATN must be dropped as ACK is dropped. | |
1702 | * | |
1703 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1704 | * message. We must exit with ACK asserted, so that the calling | |
1705 | * code may raise ATN before dropping ACK to reject the message. | |
1706 | * | |
1707 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1708 | */ | |
1709 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1710 | if (p == PHASE_MSGOUT && c > 1) | |
1711 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1712 | else | |
1713 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1714 | } | |
1715 | } while (--c); | |
1716 | ||
d65e634a | 1717 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1718 | |
1719 | *count = c; | |
1720 | *data = d; | |
1721 | tmp = NCR5380_read(STATUS_REG); | |
1722 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1723 | * asserted or if ACK hasn't been released yet. The latter applies if |
1724 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1725 | */ |
a2edc4a6 | 1726 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1727 | *phase = tmp & PHASE_MASK; |
1728 | else | |
1729 | *phase = PHASE_UNKNOWN; | |
1730 | ||
1731 | if (!c || (*phase == p)) | |
1732 | return 0; | |
1733 | else | |
1734 | return -1; | |
1da177e4 LT |
1735 | } |
1736 | ||
636b1ec8 FT |
1737 | /** |
1738 | * do_reset - issue a reset command | |
1739 | * @instance: adapter to reset | |
1740 | * | |
1741 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1742 | * back into sane shape. | |
1743 | * | |
1744 | * This clears the reset interrupt flag because there may be no handler for | |
1745 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1746 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1747 | */ | |
1748 | ||
1749 | static void do_reset(struct Scsi_Host *instance) | |
1750 | { | |
1751 | unsigned long flags; | |
1752 | ||
1753 | local_irq_save(flags); | |
1754 | NCR5380_write(TARGET_COMMAND_REG, | |
1755 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1756 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1757 | udelay(50); | |
1758 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1759 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1760 | local_irq_restore(flags); | |
1761 | } | |
1762 | ||
80d3eb6d FT |
1763 | /** |
1764 | * do_abort - abort the currently established nexus by going to | |
1765 | * MESSAGE OUT phase and sending an ABORT message. | |
1766 | * @instance: relevant scsi host instance | |
c28bda25 | 1767 | * |
80d3eb6d | 1768 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1769 | */ |
1770 | ||
a53a21e4 | 1771 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1772 | { |
c28bda25 RZ |
1773 | unsigned char tmp, *msgptr, phase; |
1774 | int len; | |
80d3eb6d | 1775 | int rc; |
c28bda25 RZ |
1776 | |
1777 | /* Request message out phase */ | |
1da177e4 | 1778 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1779 | |
1780 | /* | |
1781 | * Wait for the target to indicate a valid phase by asserting | |
1782 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1783 | * and can immediately send the ABORT message, or we'll have some | |
1784 | * other phase and will have to source/sink data. | |
1785 | * | |
1786 | * We really don't care what value was on the bus or what value | |
1787 | * the target sees, so we just handshake. | |
1788 | */ | |
1789 | ||
80d3eb6d FT |
1790 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1791 | if (rc < 0) | |
1792 | goto timeout; | |
1793 | ||
1794 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1795 | |
1796 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1797 | ||
80d3eb6d FT |
1798 | if (tmp != PHASE_MSGOUT) { |
1799 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1800 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1801 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1802 | if (rc < 0) | |
1803 | goto timeout; | |
c28bda25 RZ |
1804 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1805 | } | |
1806 | ||
1807 | tmp = ABORT; | |
1808 | msgptr = &tmp; | |
1809 | len = 1; | |
1810 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1811 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1812 | |
1813 | /* | |
1814 | * If we got here, and the command completed successfully, | |
1815 | * we're about to go into bus free state. | |
1816 | */ | |
1817 | ||
1818 | return len ? -1 : 0; | |
80d3eb6d FT |
1819 | |
1820 | timeout: | |
1821 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1822 | return -1; | |
1da177e4 LT |
1823 | } |
1824 | ||
1825 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1826 | /* |
1827 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1828 | * unsigned char *phase, int *count, unsigned char **data) |
1829 | * | |
1830 | * Purpose : transfers data in given phase using either real | |
1831 | * or pseudo DMA. | |
1832 | * | |
c28bda25 RZ |
1833 | * Inputs : instance - instance of driver, *phase - pointer to |
1834 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1835 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1836 | * |
1da177e4 | 1837 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1838 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1839 | * is in same phase. |
1840 | * | |
c28bda25 | 1841 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1842 | * |
1843 | */ | |
1844 | ||
1845 | ||
c28bda25 RZ |
1846 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1847 | unsigned char *phase, int *count, | |
1848 | unsigned char **data) | |
1da177e4 | 1849 | { |
c28bda25 RZ |
1850 | SETUP_HOSTDATA(instance); |
1851 | register int c = *count; | |
1852 | register unsigned char p = *phase; | |
e3f463b0 FT |
1853 | unsigned long flags; |
1854 | ||
1855 | #if defined(CONFIG_SUN3) | |
1856 | /* sanity check */ | |
1857 | if (!sun3_dma_setup_done) { | |
1858 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1859 | instance->host_no); | |
1860 | BUG(); | |
1861 | } | |
1862 | hostdata->dma_len = c; | |
1863 | ||
1864 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1865 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1866 | c, (p & SR_IO) ? "to" : "from", *data); | |
1867 | ||
1868 | /* netbsd turns off ints here, why not be safe and do it too */ | |
1869 | local_irq_save(flags); | |
1870 | ||
1871 | /* send start chain */ | |
1872 | sun3scsi_dma_start(c, *data); | |
1873 | ||
1874 | if (p & SR_IO) { | |
1875 | NCR5380_write(TARGET_COMMAND_REG, 1); | |
1876 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1877 | NCR5380_write(INITIATOR_COMMAND_REG, 0); | |
1878 | NCR5380_write(MODE_REG, | |
1879 | (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1880 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1881 | } else { | |
1882 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1883 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1884 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); | |
1885 | NCR5380_write(MODE_REG, | |
1886 | (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1887 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1888 | } | |
1889 | ||
1890 | #ifdef SUN3_SCSI_VME | |
1891 | dregs->csr |= CSR_DMA_ENABLE; | |
1892 | #endif | |
1893 | ||
1894 | local_irq_restore(flags); | |
1895 | ||
1896 | sun3_dma_active = 1; | |
1897 | ||
1898 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1899 | register unsigned char *d = *data; |
1900 | unsigned char tmp; | |
c28bda25 RZ |
1901 | |
1902 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1903 | *phase = tmp; | |
1904 | return -1; | |
1905 | } | |
1da177e4 | 1906 | |
ef1081cb FT |
1907 | if (hostdata->read_overruns && (p & SR_IO)) |
1908 | c -= hostdata->read_overruns; | |
1da177e4 | 1909 | |
d65e634a | 1910 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1911 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1912 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1913 | |
c28bda25 | 1914 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 LT |
1915 | |
1916 | #ifdef REAL_DMA | |
c28bda25 | 1917 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1da177e4 LT |
1918 | #endif /* def REAL_DMA */ |
1919 | ||
ef1081cb | 1920 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1921 | /* On the Medusa, it is a must to initialize the DMA before |
1922 | * starting the NCR. This is also the cleaner way for the TT. | |
1923 | */ | |
1924 | local_irq_save(flags); | |
1925 | hostdata->dma_len = (p & SR_IO) ? | |
1926 | NCR5380_dma_read_setup(instance, d, c) : | |
1927 | NCR5380_dma_write_setup(instance, d, c); | |
1928 | local_irq_restore(flags); | |
1929 | } | |
1930 | ||
1931 | if (p & SR_IO) | |
1932 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1933 | else { | |
1934 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1935 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1936 | } | |
1937 | ||
ef1081cb | 1938 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1939 | /* On the Falcon, the DMA setup must be done after the last */ |
1940 | /* NCR access, else the DMA setup gets trashed! | |
1941 | */ | |
1942 | local_irq_save(flags); | |
1943 | hostdata->dma_len = (p & SR_IO) ? | |
1944 | NCR5380_dma_read_setup(instance, d, c) : | |
1945 | NCR5380_dma_write_setup(instance, d, c); | |
1946 | local_irq_restore(flags); | |
1947 | } | |
e3f463b0 FT |
1948 | #endif /* !defined(CONFIG_SUN3) */ |
1949 | ||
c28bda25 | 1950 | return 0; |
1da177e4 LT |
1951 | } |
1952 | #endif /* defined(REAL_DMA) */ | |
1953 | ||
1954 | /* | |
1955 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1956 | * | |
c28bda25 RZ |
1957 | * Purpose : run through the various SCSI phases and do as the target |
1958 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1959 | * instance->connected. |
1960 | * | |
1961 | * Inputs : instance, instance for which we are doing commands | |
1962 | * | |
c28bda25 | 1963 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1964 | * modified if a command disconnects, *instance->connected will |
1965 | * change. | |
1966 | * | |
c28bda25 RZ |
1967 | * XXX Note : we need to watch for bus free or a reset condition here |
1968 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1969 | */ |
c28bda25 RZ |
1970 | |
1971 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1972 | { |
c28bda25 RZ |
1973 | SETUP_HOSTDATA(instance); |
1974 | unsigned long flags; | |
1975 | unsigned char msgout = NOP; | |
1976 | int sink = 0; | |
1977 | int len; | |
1da177e4 | 1978 | #if defined(REAL_DMA) |
c28bda25 | 1979 | int transfersize; |
1da177e4 | 1980 | #endif |
c28bda25 RZ |
1981 | unsigned char *data; |
1982 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1983 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
c28bda25 | 1984 | |
e3f463b0 FT |
1985 | #ifdef SUN3_SCSI_VME |
1986 | dregs->csr |= CSR_INTR; | |
1987 | #endif | |
1988 | ||
c28bda25 RZ |
1989 | while (1) { |
1990 | tmp = NCR5380_read(STATUS_REG); | |
1991 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1992 | if (tmp & SR_REQ) { | |
1993 | phase = (tmp & PHASE_MASK); | |
1994 | if (phase != old_phase) { | |
1995 | old_phase = phase; | |
8ad3a593 | 1996 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1997 | } |
e3f463b0 FT |
1998 | #if defined(CONFIG_SUN3) |
1999 | if (phase == PHASE_CMDOUT) { | |
2000 | #if defined(REAL_DMA) | |
2001 | void *d; | |
2002 | unsigned long count; | |
2003 | ||
2004 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2005 | count = cmd->SCp.buffer->length; | |
2006 | d = sg_virt(cmd->SCp.buffer); | |
2007 | } else { | |
2008 | count = cmd->SCp.this_residual; | |
2009 | d = cmd->SCp.ptr; | |
2010 | } | |
2011 | /* this command setup for dma yet? */ | |
2012 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
2013 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
2014 | sun3scsi_dma_setup(d, count, | |
2015 | rq_data_dir(cmd->request)); | |
2016 | sun3_dma_setup_done = cmd; | |
2017 | } | |
2018 | } | |
2019 | #endif | |
2020 | #ifdef SUN3_SCSI_VME | |
2021 | dregs->csr |= CSR_INTR; | |
2022 | #endif | |
2023 | } | |
2024 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 2025 | |
c28bda25 RZ |
2026 | if (sink && (phase != PHASE_MSGOUT)) { |
2027 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
2028 | ||
2029 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
2030 | ICR_ASSERT_ACK); | |
2031 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
2032 | ; | |
2033 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2034 | ICR_ASSERT_ATN); | |
2035 | sink = 0; | |
2036 | continue; | |
2037 | } | |
2038 | ||
2039 | switch (phase) { | |
2040 | case PHASE_DATAOUT: | |
1da177e4 | 2041 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
2042 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
2043 | "aborted\n", HOSTNO); | |
2044 | sink = 1; | |
2045 | do_abort(instance); | |
2046 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2047 | cmd->scsi_done(cmd); |
c28bda25 | 2048 | return; |
1da177e4 | 2049 | #endif |
c28bda25 RZ |
2050 | case PHASE_DATAIN: |
2051 | /* | |
2052 | * If there is no room left in the current buffer in the | |
2053 | * scatter-gather list, move onto the next one. | |
2054 | */ | |
2055 | ||
2056 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2057 | ++cmd->SCp.buffer; | |
2058 | --cmd->SCp.buffers_residual; | |
2059 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 2060 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
2061 | /* ++roman: Try to merge some scatter-buffers if |
2062 | * they are at contiguous physical addresses. | |
2063 | */ | |
2064 | merge_contiguous_buffers(cmd); | |
d65e634a | 2065 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
2066 | HOSTNO, cmd->SCp.this_residual, |
2067 | cmd->SCp.buffers_residual); | |
2068 | } | |
2069 | ||
2070 | /* | |
2071 | * The preferred transfer method is going to be | |
2072 | * PSEUDO-DMA for systems that are strictly PIO, | |
2073 | * since we can let the hardware do the handshaking. | |
2074 | * | |
2075 | * For this to work, we need to know the transfersize | |
2076 | * ahead of time, since the pseudo-DMA code will sit | |
2077 | * in an unconditional loop. | |
2078 | */ | |
2079 | ||
2080 | /* ++roman: I suggest, this should be | |
2081 | * #if def(REAL_DMA) | |
2082 | * instead of leaving REAL_DMA out. | |
2083 | */ | |
1da177e4 LT |
2084 | |
2085 | #if defined(REAL_DMA) | |
e3f463b0 | 2086 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
2087 | transfersize = 0; |
2088 | if (!cmd->device->borken) | |
e3f463b0 | 2089 | #endif |
ff3d4578 FT |
2090 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
2091 | ||
2092 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
2093 | len = transfersize; |
2094 | cmd->SCp.phase = phase; | |
2095 | if (NCR5380_transfer_dma(instance, &phase, | |
2096 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2097 | /* | |
2098 | * If the watchdog timer fires, all future | |
2099 | * accesses to this device will use the | |
2100 | * polled-IO. */ | |
ff50f9ed FT |
2101 | scmd_printk(KERN_INFO, cmd, |
2102 | "switching to slow handshake\n"); | |
c28bda25 | 2103 | cmd->device->borken = 1; |
c28bda25 RZ |
2104 | sink = 1; |
2105 | do_abort(instance); | |
2106 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2107 | cmd->scsi_done(cmd); |
c28bda25 RZ |
2108 | /* XXX - need to source or sink data here, as appropriate */ |
2109 | } else { | |
1da177e4 | 2110 | #ifdef REAL_DMA |
c28bda25 RZ |
2111 | /* ++roman: When using real DMA, |
2112 | * information_transfer() should return after | |
2113 | * starting DMA since it has nothing more to | |
2114 | * do. | |
2115 | */ | |
2116 | return; | |
2117 | #else | |
2118 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2119 | #endif |
c28bda25 RZ |
2120 | } |
2121 | } else | |
1da177e4 | 2122 | #endif /* defined(REAL_DMA) */ |
c28bda25 RZ |
2123 | NCR5380_transfer_pio(instance, &phase, |
2124 | (int *)&cmd->SCp.this_residual, | |
2125 | (unsigned char **)&cmd->SCp.ptr); | |
e3f463b0 FT |
2126 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2127 | /* if we had intended to dma that command clear it */ | |
2128 | if (sun3_dma_setup_done == cmd) | |
2129 | sun3_dma_setup_done = NULL; | |
2130 | #endif | |
c28bda25 RZ |
2131 | break; |
2132 | case PHASE_MSGIN: | |
2133 | len = 1; | |
2134 | data = &tmp; | |
2135 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2136 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2137 | cmd->SCp.Message = tmp; | |
2138 | ||
2139 | switch (tmp) { | |
c28bda25 RZ |
2140 | case ABORT: |
2141 | case COMMAND_COMPLETE: | |
2142 | /* Accept message by clearing ACK */ | |
2143 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2144 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2145 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
e3c3da67 FT |
2146 | |
2147 | local_irq_save(flags); | |
e3c3da67 | 2148 | hostdata->connected = NULL; |
1da177e4 | 2149 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2150 | cmd_free_tag(cmd); |
2151 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
2152 | /* Turn a QUEUE FULL status into BUSY, I think the | |
2153 | * mid level cannot handle QUEUE FULL :-( (The | |
2154 | * command is retried after BUSY). Also update our | |
2155 | * queue size to the number of currently issued | |
2156 | * commands now. | |
2157 | */ | |
2158 | /* ++Andreas: the mid level code knows about | |
2159 | QUEUE_FULL now. */ | |
61d739a4 | 2160 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 2161 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2162 | "QUEUE_FULL after %d commands\n", |
2163 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2164 | ta->nr_allocated); | |
2165 | if (ta->queue_size > ta->nr_allocated) | |
2166 | ta->nr_allocated = ta->queue_size; | |
2167 | } | |
1da177e4 | 2168 | #else |
c28bda25 | 2169 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2170 | #endif |
c28bda25 RZ |
2171 | /* Enable reselect interrupts */ |
2172 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2173 | ||
2174 | /* | |
2175 | * I'm not sure what the correct thing to do here is : | |
2176 | * | |
2177 | * If the command that just executed is NOT a request | |
2178 | * sense, the obvious thing to do is to set the result | |
2179 | * code to the values of the stored parameters. | |
2180 | * | |
2181 | * If it was a REQUEST SENSE command, we need some way to | |
2182 | * differentiate between the failure code of the original | |
2183 | * and the failure code of the REQUEST sense - the obvious | |
2184 | * case is success, where we fall through and leave the | |
2185 | * result code unchanged. | |
2186 | * | |
2187 | * The non-obvious place is where the REQUEST SENSE failed | |
2188 | */ | |
2189 | ||
2190 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2191 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2192 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2193 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2194 | |
28424d3a BH |
2195 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2196 | hostdata->ses.cmd_len) { | |
2197 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2198 | hostdata->ses.cmd_len = 0 ; | |
2199 | } | |
2200 | ||
c28bda25 RZ |
2201 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2202 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2203 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2204 | ||
d65e634a | 2205 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 | 2206 | |
c28bda25 | 2207 | LIST(cmd,hostdata->issue_queue); |
3130d905 | 2208 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2209 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
d65e634a | 2210 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
c28bda25 | 2211 | "issue queue\n", H_NO(cmd)); |
997acab7 | 2212 | } else { |
c28bda25 RZ |
2213 | cmd->scsi_done(cmd); |
2214 | } | |
2215 | ||
2216 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2217 | /* | |
2218 | * Restore phase bits to 0 so an interrupted selection, | |
2219 | * arbitration can resume. | |
2220 | */ | |
2221 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2222 | ||
c28bda25 RZ |
2223 | /* ++roman: For Falcon SCSI, release the lock on the |
2224 | * ST-DMA here if no other commands are waiting on the | |
2225 | * disconnected queue. | |
2226 | */ | |
e3c3da67 FT |
2227 | maybe_release_dma_irq(instance); |
2228 | local_irq_restore(flags); | |
c28bda25 RZ |
2229 | return; |
2230 | case MESSAGE_REJECT: | |
2231 | /* Accept message by clearing ACK */ | |
2232 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2233 | /* Enable reselect interrupts */ | |
2234 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2235 | switch (hostdata->last_message) { | |
2236 | case HEAD_OF_QUEUE_TAG: | |
2237 | case ORDERED_QUEUE_TAG: | |
2238 | case SIMPLE_QUEUE_TAG: | |
2239 | /* The target obviously doesn't support tagged | |
2240 | * queuing, even though it announced this ability in | |
2241 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2242 | * clear 'tagged_supported' and lock the LUN, since | |
2243 | * the command is treated as untagged further on. | |
2244 | */ | |
2245 | cmd->device->tagged_supported = 0; | |
2246 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2247 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2248 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2249 | "QUEUE_TAG message; tagged queuing " |
2250 | "disabled\n", | |
2251 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2252 | break; | |
2253 | } | |
2254 | break; | |
2255 | case DISCONNECT: | |
2256 | /* Accept message by clearing ACK */ | |
2257 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2258 | local_irq_save(flags); | |
c28bda25 | 2259 | LIST(cmd,hostdata->disconnected_queue); |
3130d905 | 2260 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2261 | hostdata->connected = NULL; |
2262 | hostdata->disconnected_queue = cmd; | |
2263 | local_irq_restore(flags); | |
9cb78c16 | 2264 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2265 | "moved from connected to the " |
2266 | "disconnected_queue\n", HOSTNO, | |
2267 | cmd->device->id, cmd->device->lun); | |
2268 | /* | |
2269 | * Restore phase bits to 0 so an interrupted selection, | |
2270 | * arbitration can resume. | |
2271 | */ | |
2272 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2273 | ||
2274 | /* Enable reselect interrupts */ | |
2275 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2276 | #ifdef SUN3_SCSI_VME |
2277 | dregs->csr |= CSR_DMA_ENABLE; | |
2278 | #endif | |
c28bda25 RZ |
2279 | return; |
2280 | /* | |
2281 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2282 | * operation, in violation of the SCSI spec so we can safely | |
2283 | * ignore SAVE/RESTORE pointers calls. | |
2284 | * | |
2285 | * Unfortunately, some disks violate the SCSI spec and | |
2286 | * don't issue the required SAVE_POINTERS message before | |
2287 | * disconnecting, and we have to break spec to remain | |
2288 | * compatible. | |
2289 | */ | |
2290 | case SAVE_POINTERS: | |
2291 | case RESTORE_POINTERS: | |
2292 | /* Accept message by clearing ACK */ | |
2293 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2294 | /* Enable reselect interrupts */ | |
2295 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2296 | break; | |
2297 | case EXTENDED_MESSAGE: | |
2298 | /* | |
2299 | * Extended messages are sent in the following format : | |
2300 | * Byte | |
2301 | * 0 EXTENDED_MESSAGE == 1 | |
2302 | * 1 length (includes one byte for code, doesn't | |
2303 | * include first two bytes) | |
2304 | * 2 code | |
2305 | * 3..length+1 arguments | |
2306 | * | |
2307 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2308 | * byte, since spi_print_msg() wants the whole thing. | |
2309 | */ | |
2310 | extended_msg[0] = EXTENDED_MESSAGE; | |
2311 | /* Accept first byte by clearing ACK */ | |
2312 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2313 | ||
d65e634a | 2314 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2315 | |
2316 | len = 2; | |
2317 | data = extended_msg + 1; | |
2318 | phase = PHASE_MSGIN; | |
2319 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2320 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2321 | (int)extended_msg[1], (int)extended_msg[2]); |
2322 | ||
2323 | if (!len && extended_msg[1] <= | |
2324 | (sizeof(extended_msg) - 1)) { | |
2325 | /* Accept third byte by clearing ACK */ | |
2326 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2327 | len = extended_msg[1] - 1; | |
2328 | data = extended_msg + 3; | |
2329 | phase = PHASE_MSGIN; | |
2330 | ||
2331 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2332 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2333 | HOSTNO, len); |
2334 | ||
2335 | switch (extended_msg[2]) { | |
2336 | case EXTENDED_SDTR: | |
2337 | case EXTENDED_WDTR: | |
2338 | case EXTENDED_MODIFY_DATA_POINTER: | |
2339 | case EXTENDED_EXTENDED_IDENTIFY: | |
2340 | tmp = 0; | |
2341 | } | |
2342 | } else if (len) { | |
2343 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2344 | "extended message\n", HOSTNO); | |
2345 | tmp = 0; | |
2346 | } else { | |
2347 | printk(KERN_NOTICE "scsi%d: extended message " | |
2348 | "code %02x length %d is too long\n", | |
2349 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2350 | tmp = 0; | |
2351 | } | |
2352 | /* Fall through to reject message */ | |
2353 | ||
2354 | /* | |
2355 | * If we get something weird that we aren't expecting, | |
2356 | * reject it. | |
2357 | */ | |
2358 | default: | |
2359 | if (!tmp) { | |
ff50f9ed FT |
2360 | printk(KERN_INFO "scsi%d: rejecting message ", |
2361 | instance->host_no); | |
c28bda25 RZ |
2362 | spi_print_msg(extended_msg); |
2363 | printk("\n"); | |
2364 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2365 | scmd_printk(KERN_INFO, cmd, |
2366 | "rejecting unknown message %02x\n", | |
2367 | tmp); | |
c28bda25 | 2368 | else |
ff50f9ed FT |
2369 | scmd_printk(KERN_INFO, cmd, |
2370 | "rejecting unknown extended message code %02x, length %d\n", | |
2371 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2372 | |
2373 | msgout = MESSAGE_REJECT; | |
2374 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2375 | break; | |
2376 | } /* switch (tmp) */ | |
2377 | break; | |
2378 | case PHASE_MSGOUT: | |
2379 | len = 1; | |
2380 | data = &msgout; | |
2381 | hostdata->last_message = msgout; | |
2382 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2383 | if (msgout == ABORT) { | |
e3c3da67 | 2384 | local_irq_save(flags); |
1da177e4 | 2385 | #ifdef SUPPORT_TAGS |
c28bda25 | 2386 | cmd_free_tag(cmd); |
1da177e4 | 2387 | #else |
c28bda25 | 2388 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2389 | #endif |
c28bda25 RZ |
2390 | hostdata->connected = NULL; |
2391 | cmd->result = DID_ERROR << 16; | |
c28bda25 | 2392 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
e3c3da67 FT |
2393 | maybe_release_dma_irq(instance); |
2394 | local_irq_restore(flags); | |
2395 | cmd->scsi_done(cmd); | |
c28bda25 RZ |
2396 | return; |
2397 | } | |
2398 | msgout = NOP; | |
2399 | break; | |
2400 | case PHASE_CMDOUT: | |
2401 | len = cmd->cmd_len; | |
2402 | data = cmd->cmnd; | |
2403 | /* | |
2404 | * XXX for performance reasons, on machines with a | |
2405 | * PSEUDO-DMA architecture we should probably | |
2406 | * use the dma transfer function. | |
2407 | */ | |
2408 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2409 | break; | |
2410 | case PHASE_STATIN: | |
2411 | len = 1; | |
2412 | data = &tmp; | |
2413 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2414 | cmd->SCp.Status = tmp; | |
2415 | break; | |
2416 | default: | |
2417 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2418 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2419 | } /* switch(phase) */ |
686f3990 FT |
2420 | } else { |
2421 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
2422 | } | |
c28bda25 | 2423 | } /* while (1) */ |
1da177e4 LT |
2424 | } |
2425 | ||
2426 | /* | |
2427 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2428 | * | |
c28bda25 | 2429 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2430 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2431 | * nexus has been reestablished, |
c28bda25 | 2432 | * |
1da177e4 LT |
2433 | * Inputs : instance - this instance of the NCR5380. |
2434 | * | |
2435 | */ | |
2436 | ||
2437 | ||
e3f463b0 FT |
2438 | /* it might eventually prove necessary to do a dma setup on |
2439 | reselection, but it doesn't seem to be needed now -- sam */ | |
2440 | ||
c28bda25 | 2441 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2442 | { |
c28bda25 RZ |
2443 | SETUP_HOSTDATA(instance); |
2444 | unsigned char target_mask; | |
e3f463b0 | 2445 | unsigned char lun; |
1da177e4 | 2446 | #ifdef SUPPORT_TAGS |
c28bda25 | 2447 | unsigned char tag; |
1da177e4 | 2448 | #endif |
c28bda25 | 2449 | unsigned char msg[3]; |
e3f463b0 FT |
2450 | int __maybe_unused len; |
2451 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2452 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2453 | |
2454 | /* | |
2455 | * Disable arbitration, etc. since the host adapter obviously | |
2456 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2457 | */ | |
2458 | ||
2459 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2460 | |
2461 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2462 | ||
d65e634a | 2463 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2464 | |
2465 | /* | |
2466 | * At this point, we have detected that our SCSI ID is on the bus, | |
2467 | * SEL is true and BSY was false for at least one bus settle delay | |
2468 | * (400 ns). | |
2469 | * | |
2470 | * We must assert BSY ourselves, until the target drops the SEL | |
2471 | * signal. | |
2472 | */ | |
2473 | ||
2474 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2475 | ||
2476 | while (NCR5380_read(STATUS_REG) & SR_SEL) | |
2477 | ; | |
2478 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2479 | ||
2480 | /* | |
2481 | * Wait for target to go into MSGIN. | |
2482 | */ | |
2483 | ||
2484 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
2485 | ; | |
2486 | ||
e3f463b0 FT |
2487 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2488 | /* acknowledge toggle to MSGIN */ | |
2489 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2490 | ||
2491 | /* peek at the byte without really hitting the bus */ | |
2492 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2493 | #else | |
c28bda25 RZ |
2494 | len = 1; |
2495 | data = msg; | |
2496 | phase = PHASE_MSGIN; | |
2497 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
e3f463b0 | 2498 | #endif |
c28bda25 RZ |
2499 | |
2500 | if (!(msg[0] & 0x80)) { | |
2501 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | |
2502 | spi_print_msg(msg); | |
2503 | do_abort(instance); | |
2504 | return; | |
2505 | } | |
2506 | lun = (msg[0] & 0x07); | |
1da177e4 | 2507 | |
e3f463b0 | 2508 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2509 | /* If the phase is still MSGIN, the target wants to send some more |
2510 | * messages. In case it supports tagged queuing, this is probably a | |
2511 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2512 | */ | |
2513 | tag = TAG_NONE; | |
ca513fc9 | 2514 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2515 | /* Accept previous IDENTIFY message by clearing ACK */ |
2516 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2517 | len = 2; | |
2518 | data = msg + 1; | |
2519 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2520 | msg[1] == SIMPLE_QUEUE_TAG) | |
2521 | tag = msg[2]; | |
d65e634a | 2522 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2523 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2524 | } | |
1da177e4 | 2525 | #endif |
c28bda25 RZ |
2526 | |
2527 | /* | |
2528 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2529 | * just reestablished, and remove it from the disconnected queue. | |
2530 | */ | |
2531 | ||
710ddd0d | 2532 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 RZ |
2533 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
2534 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
1da177e4 | 2535 | #ifdef SUPPORT_TAGS |
c28bda25 | 2536 | && (tag == tmp->tag) |
1da177e4 | 2537 | #endif |
c28bda25 | 2538 | ) { |
c28bda25 RZ |
2539 | if (prev) { |
2540 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2541 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2542 | } else { |
2543 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2544 | hostdata->disconnected_queue = NEXT(tmp); | |
2545 | } | |
3130d905 | 2546 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2547 | break; |
2548 | } | |
1da177e4 | 2549 | } |
c28bda25 RZ |
2550 | |
2551 | if (!tmp) { | |
2552 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | |
1da177e4 | 2553 | #ifdef SUPPORT_TAGS |
c28bda25 | 2554 | "tag %d " |
1da177e4 | 2555 | #endif |
c28bda25 RZ |
2556 | "not in disconnected_queue.\n", |
2557 | HOSTNO, target_mask, lun | |
1da177e4 | 2558 | #ifdef SUPPORT_TAGS |
c28bda25 | 2559 | , tag |
1da177e4 | 2560 | #endif |
c28bda25 RZ |
2561 | ); |
2562 | /* | |
2563 | * Since we have an established nexus that we can't do anything | |
2564 | * with, we must abort it. | |
2565 | */ | |
2566 | do_abort(instance); | |
2567 | return; | |
2568 | } | |
1da177e4 | 2569 | |
e3f463b0 FT |
2570 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2571 | /* engage dma setup for the command we just saw */ | |
2572 | { | |
2573 | void *d; | |
2574 | unsigned long count; | |
2575 | ||
2576 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2577 | count = tmp->SCp.buffer->length; | |
2578 | d = sg_virt(tmp->SCp.buffer); | |
2579 | } else { | |
2580 | count = tmp->SCp.this_residual; | |
2581 | d = tmp->SCp.ptr; | |
2582 | } | |
2583 | /* setup this command for dma if not already */ | |
2584 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2585 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2586 | sun3_dma_setup_done = tmp; | |
2587 | } | |
2588 | } | |
2589 | ||
2590 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2591 | #endif | |
2592 | ||
c28bda25 RZ |
2593 | /* Accept message by clearing ACK */ |
2594 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2595 | |
e3f463b0 FT |
2596 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2597 | /* If the phase is still MSGIN, the target wants to send some more | |
2598 | * messages. In case it supports tagged queuing, this is probably a | |
2599 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2600 | */ | |
2601 | tag = TAG_NONE; | |
2602 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2603 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2604 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2605 | len = 2; | |
2606 | data = msg + 1; | |
2607 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2608 | msg[1] == SIMPLE_QUEUE_TAG) | |
2609 | tag = msg[2]; | |
2610 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2611 | HOSTNO, target_mask, lun, tag); | |
2612 | } | |
2613 | #endif | |
2614 | ||
c28bda25 | 2615 | hostdata->connected = tmp; |
9cb78c16 | 2616 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2617 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2618 | } |
2619 | ||
2620 | ||
2621 | /* | |
710ddd0d | 2622 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2623 | * |
2624 | * Purpose : abort a command | |
2625 | * | |
710ddd0d | 2626 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2627 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2628 | * used. |
2629 | * | |
b6c92b7e | 2630 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2631 | * |
c28bda25 RZ |
2632 | * XXX - there is no way to abort the command that is currently |
2633 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2634 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2635 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2636 | */ |
2637 | ||
2638 | static | |
710ddd0d | 2639 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2640 | { |
c28bda25 RZ |
2641 | struct Scsi_Host *instance = cmd->device->host; |
2642 | SETUP_HOSTDATA(instance); | |
710ddd0d | 2643 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2644 | unsigned long flags; |
1da177e4 | 2645 | |
1fa6b5fb | 2646 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2647 | |
c28bda25 RZ |
2648 | NCR5380_print_status(instance); |
2649 | ||
2650 | local_irq_save(flags); | |
1da177e4 | 2651 | |
d65e634a | 2652 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2653 | NCR5380_read(BUS_AND_STATUS_REG), |
2654 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2655 | |
2656 | #if 1 | |
c28bda25 RZ |
2657 | /* |
2658 | * Case 1 : If the command is the currently executing command, | |
2659 | * we'll set the aborted flag and return control so that | |
2660 | * information transfer routine can exit cleanly. | |
2661 | */ | |
1da177e4 | 2662 | |
c28bda25 | 2663 | if (hostdata->connected == cmd) { |
1da177e4 | 2664 | |
d65e634a | 2665 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2666 | /* |
2667 | * We should perform BSY checking, and make sure we haven't slipped | |
2668 | * into BUS FREE. | |
2669 | */ | |
1da177e4 | 2670 | |
c28bda25 RZ |
2671 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2672 | /* | |
2673 | * Since we can't change phases until we've completed the current | |
2674 | * handshake, we have to source or sink a byte of data if the current | |
2675 | * phase is not MSGOUT. | |
2676 | */ | |
1da177e4 | 2677 | |
c28bda25 RZ |
2678 | /* |
2679 | * Return control to the executing NCR drive so we can clear the | |
2680 | * aborted flag and get back into our main loop. | |
2681 | */ | |
1da177e4 | 2682 | |
c28bda25 | 2683 | if (do_abort(instance) == 0) { |
c28bda25 RZ |
2684 | hostdata->connected = NULL; |
2685 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2686 | #ifdef SUPPORT_TAGS |
c28bda25 | 2687 | cmd_free_tag(cmd); |
1da177e4 | 2688 | #else |
c28bda25 | 2689 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2690 | #endif |
e3c3da67 | 2691 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2692 | local_irq_restore(flags); |
2693 | cmd->scsi_done(cmd); | |
2b0f834c | 2694 | return SUCCESS; |
c28bda25 | 2695 | } else { |
e3c3da67 | 2696 | local_irq_restore(flags); |
c28bda25 | 2697 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2698 | return FAILED; |
c28bda25 RZ |
2699 | } |
2700 | } | |
1da177e4 LT |
2701 | #endif |
2702 | ||
c28bda25 RZ |
2703 | /* |
2704 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2705 | * from the issue queue. | |
2706 | */ | |
710ddd0d FT |
2707 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2708 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2709 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2710 | if (cmd == tmp) { | |
2711 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2712 | (*prev) = NEXT(tmp); | |
3130d905 | 2713 | SET_NEXT(tmp, NULL); |
c28bda25 | 2714 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2715 | maybe_release_dma_irq(instance); |
c28bda25 | 2716 | local_irq_restore(flags); |
d65e634a | 2717 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2718 | HOSTNO); |
2719 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2720 | * yet... */ | |
2721 | tmp->scsi_done(tmp); | |
2b0f834c | 2722 | return SUCCESS; |
c28bda25 | 2723 | } |
1da177e4 LT |
2724 | } |
2725 | ||
c28bda25 RZ |
2726 | /* |
2727 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2728 | * and let the high level SCSI driver retry at a later time or | |
2729 | * issue a reset. | |
2730 | * | |
2731 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2732 | * and handling them cleanly in this situation would make the common | |
2733 | * case of noresets less efficient, and would pollute our code. So, | |
2734 | * we fail. | |
2735 | */ | |
1da177e4 | 2736 | |
c28bda25 RZ |
2737 | if (hostdata->connected) { |
2738 | local_irq_restore(flags); | |
d65e634a | 2739 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2740 | return FAILED; |
c28bda25 | 2741 | } |
1da177e4 | 2742 | |
c28bda25 RZ |
2743 | /* |
2744 | * Case 4: If the command is currently disconnected from the bus, and | |
2745 | * there are no connected commands, we reconnect the I_T_L or | |
2746 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2747 | * an abort message. | |
2748 | * | |
2749 | * This case is especially ugly. In order to reestablish the nexus, we | |
2750 | * need to call NCR5380_select(). The easiest way to implement this | |
2751 | * function was to abort if the bus was busy, and let the interrupt | |
2752 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2753 | * where necessary, meaning interrupts need to be enabled. | |
2754 | * | |
2755 | * When interrupts are enabled, the queues may change - so we | |
2756 | * can't remove it from the disconnected queue before selecting it | |
2757 | * because that could cause a failure in hashing the nexus if that | |
2758 | * device reselected. | |
2759 | * | |
2760 | * Since the queues may change, we can't use the pointers from when we | |
2761 | * first locate it. | |
2762 | * | |
2763 | * So, we must first locate the command, and if NCR5380_select() | |
2764 | * succeeds, then issue the abort, relocate the command and remove | |
2765 | * it from the disconnected queue. | |
2766 | */ | |
2767 | ||
710ddd0d | 2768 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2769 | tmp = NEXT(tmp)) { |
2770 | if (cmd == tmp) { | |
2771 | local_irq_restore(flags); | |
d65e634a | 2772 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2773 | |
76f13b93 | 2774 | if (NCR5380_select(instance, cmd)) |
2b0f834c | 2775 | return FAILED; |
1da177e4 | 2776 | |
d65e634a | 2777 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2778 | |
2779 | do_abort(instance); | |
2780 | ||
2781 | local_irq_save(flags); | |
710ddd0d FT |
2782 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2783 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2784 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2785 | if (cmd == tmp) { | |
2786 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2787 | *prev = NEXT(tmp); | |
3130d905 | 2788 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2789 | tmp->result = DID_ABORT << 16; |
2790 | /* We must unlock the tag/LUN immediately here, since the | |
2791 | * target goes to BUS FREE and doesn't send us another | |
2792 | * message (COMMAND_COMPLETE or the like) | |
2793 | */ | |
1da177e4 | 2794 | #ifdef SUPPORT_TAGS |
c28bda25 | 2795 | cmd_free_tag(tmp); |
1da177e4 | 2796 | #else |
c28bda25 | 2797 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2798 | #endif |
e3c3da67 | 2799 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2800 | local_irq_restore(flags); |
2801 | tmp->scsi_done(tmp); | |
2b0f834c | 2802 | return SUCCESS; |
c28bda25 RZ |
2803 | } |
2804 | } | |
1da177e4 LT |
2805 | } |
2806 | } | |
2807 | ||
e3c3da67 FT |
2808 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2809 | * possible at all) At least, we should check if the lock could be | |
2810 | * released after the abort, in case it is kept due to some bug. | |
2811 | */ | |
2812 | maybe_release_dma_irq(instance); | |
2813 | local_irq_restore(flags); | |
2814 | ||
c28bda25 RZ |
2815 | /* |
2816 | * Case 5 : If we reached this point, the command was not found in any of | |
2817 | * the queues. | |
2818 | * | |
2819 | * We probably reached this point because of an unlikely race condition | |
2820 | * between the command completing successfully and the abortion code, | |
2821 | * so we won't panic, but we will notify the user in case something really | |
2822 | * broke. | |
2823 | */ | |
1da177e4 | 2824 | |
ad361c98 | 2825 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2826 | |
2b0f834c | 2827 | return FAILED; |
1da177e4 LT |
2828 | } |
2829 | ||
2830 | ||
3be1b3ea FT |
2831 | /** |
2832 | * NCR5380_bus_reset - reset the SCSI bus | |
2833 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2834 | * |
3be1b3ea | 2835 | * Returns SUCCESS |
c28bda25 | 2836 | */ |
1da177e4 | 2837 | |
710ddd0d | 2838 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2839 | { |
e3c3da67 FT |
2840 | struct Scsi_Host *instance = cmd->device->host; |
2841 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2842 | int i; |
2843 | unsigned long flags; | |
1da177e4 | 2844 | |
3be1b3ea FT |
2845 | local_irq_save(flags); |
2846 | ||
2847 | #if (NDEBUG & NDEBUG_ANY) | |
2848 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
e3c3da67 | 2849 | NCR5380_print_status(instance); |
3be1b3ea FT |
2850 | #endif |
2851 | ||
2852 | do_reset(instance); | |
c28bda25 | 2853 | |
c28bda25 | 2854 | /* reset NCR registers */ |
c28bda25 RZ |
2855 | NCR5380_write(MODE_REG, MR_BASE); |
2856 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2857 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2858 | |
c28bda25 RZ |
2859 | /* After the reset, there are no more connected or disconnected commands |
2860 | * and no busy units; so clear the low-level status here to avoid | |
2861 | * conflicts when the mid-level code tries to wake up the affected | |
2862 | * commands! | |
2863 | */ | |
2864 | ||
2865 | if (hostdata->issue_queue) | |
d65e634a | 2866 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
c28bda25 | 2867 | if (hostdata->connected) |
d65e634a | 2868 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 | 2869 | if (hostdata->disconnected_queue) |
d65e634a | 2870 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
c28bda25 | 2871 | |
c28bda25 RZ |
2872 | hostdata->issue_queue = NULL; |
2873 | hostdata->connected = NULL; | |
2874 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2875 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2876 | free_all_tags(hostdata); |
1da177e4 | 2877 | #endif |
c28bda25 RZ |
2878 | for (i = 0; i < 8; ++i) |
2879 | hostdata->busy[i] = 0; | |
1da177e4 | 2880 | #ifdef REAL_DMA |
c28bda25 | 2881 | hostdata->dma_len = 0; |
1da177e4 | 2882 | #endif |
e3c3da67 FT |
2883 | |
2884 | maybe_release_dma_irq(instance); | |
c28bda25 | 2885 | local_irq_restore(flags); |
1da177e4 | 2886 | |
2b0f834c | 2887 | return SUCCESS; |
1da177e4 | 2888 | } |