Commit | Line | Data |
---|---|---|
c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * For more information, please consult |
1da177e4 LT |
15 | * |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
28 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
29 | * this file, too: | |
30 | * | |
31 | * - Some of the debug statements were incorrect (undefined variables and the | |
32 | * like). I fixed that. | |
33 | * | |
34 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
35 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
36 | * in the #if statement. | |
37 | * | |
38 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
39 | * phase after starting the DMA. It has nothing more to do. | |
40 | * | |
41 | * - The interrupt service routine should run main after end of DMA, too (not | |
42 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
43 | * for more interrupts after running main, since a DMA process may have | |
44 | * been started and interrupts are turned on now. The new int could happen | |
45 | * inside the execution of NCR5380_intr(), leading to recursive | |
46 | * calls. | |
47 | * | |
48 | * - I've added a function merge_contiguous_buffers() that tries to | |
49 | * merge scatter-gather buffers that are located at contiguous | |
50 | * physical addresses and can be processed with the same DMA setup. | |
51 | * Since most scatter-gather operations work on a page (4K) of | |
52 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
53 | * DMA setup actions are saved. | |
54 | * | |
55 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
56 | * and USLEEP, because these were messing up readability and will never be | |
57 | * needed for Atari SCSI. | |
c28bda25 | 58 | * |
1da177e4 LT |
59 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
60 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
61 | * interrupt. | |
62 | * | |
63 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
64 | * constructs. In my eyes, this made the source rather unreadable, so I | |
65 | * finally replaced that by the *_PRINTK() macros. | |
66 | * | |
67 | */ | |
68 | ||
e3f463b0 FT |
69 | /* Adapted for the sun3 by Sam Creasey. */ |
70 | ||
1da177e4 | 71 | #if (NDEBUG & NDEBUG_LISTS) |
c28bda25 RZ |
72 | #define LIST(x, y) \ |
73 | do { \ | |
74 | printk("LINE:%d Adding %p to %p\n", \ | |
75 | __LINE__, (void*)(x), (void*)(y)); \ | |
76 | if ((x) == (y)) \ | |
77 | udelay(5); \ | |
78 | } while (0) | |
79 | #define REMOVE(w, x, y, z) \ | |
80 | do { \ | |
81 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
82 | __LINE__, (void*)(w), (void*)(x), \ | |
83 | (void*)(y), (void*)(z)); \ | |
84 | if ((x) == (y)) \ | |
85 | udelay(5); \ | |
86 | } while (0) | |
1da177e4 LT |
87 | #else |
88 | #define LIST(x,y) | |
89 | #define REMOVE(w,x,y,z) | |
90 | #endif | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * Design | |
1da177e4 | 94 | * |
c28bda25 | 95 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 96 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 97 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
98 | * memory mapped) and drops this file in their 'C' wrapper. |
99 | * | |
c28bda25 | 100 | * As far as command queueing, two queues are maintained for |
1da177e4 | 101 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
102 | * and commands that are currently executing. This means that an |
103 | * unlimited number of commands may be queued, letting | |
104 | * more commands propagate from the higher driver levels giving higher | |
105 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
106 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
107 | * while a command is already executing. |
108 | * | |
1da177e4 | 109 | * |
c28bda25 | 110 | * Issues specific to the NCR5380 : |
1da177e4 | 111 | * |
c28bda25 RZ |
112 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
113 | * piece of hardware that requires you to sit in a loop polling for | |
114 | * the REQ signal as long as you are connected. Some devices are | |
115 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 116 | * while doing long seek operations. [...] These |
1da177e4 LT |
117 | * broken devices are the exception rather than the rule and I'd rather |
118 | * spend my time optimizing for the normal case. | |
119 | * | |
120 | * Architecture : | |
121 | * | |
122 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
123 | * which is started from a workqueue for each NCR5380 host in the |
124 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
125 | * removing the commands from the issue queue and calling | |
126 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
127 | * |
128 | * Once a nexus is established, the NCR5380_information_transfer() | |
129 | * phase goes through the various phases as instructed by the target. | |
130 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
131 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
132 | * queue, and NCR5380_main tries to find more work. If the target is |
133 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
134 | * |
135 | * If a command has disconnected, eventually an interrupt will trigger, | |
136 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
137 | * to reestablish a nexus. This will run main if necessary. | |
138 | * | |
c28bda25 | 139 | * On command termination, the done function will be called as |
1da177e4 LT |
140 | * appropriate. |
141 | * | |
c28bda25 | 142 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
143 | * structures, being initialized after the command is connected |
144 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
145 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
146 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
147 | */ | |
148 | ||
149 | /* | |
150 | * Using this file : | |
151 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 152 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
153 | * and macros and include this file in your driver. |
154 | * | |
c28bda25 | 155 | * These macros control options : |
1da177e4 | 156 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 157 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 158 | * |
ff50f9ed FT |
159 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
160 | * transceivers. | |
161 | * | |
1da177e4 LT |
162 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
163 | * | |
164 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
165 | * | |
166 | * These macros MUST be defined : | |
c28bda25 | 167 | * |
1da177e4 LT |
168 | * NCR5380_read(register) - read from the specified register |
169 | * | |
c28bda25 | 170 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 171 | * |
ff50f9ed FT |
172 | * NCR5380_implementation_fields - additional fields needed for this |
173 | * specific implementation of the NCR5380 | |
174 | * | |
1da177e4 | 175 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 176 | * REAL functions : |
1da177e4 | 177 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 178 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
179 | * that they were able to program the controller for. |
180 | * | |
c28bda25 | 181 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
182 | * available as NCR5380_i386_dma_write_setup, |
183 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
184 | * | |
185 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
186 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
187 | * NCR5380_dma_residual(instance); - residual count | |
188 | * | |
189 | * PSEUDO functions : | |
190 | * NCR5380_pwrite(instance, src, count) | |
191 | * NCR5380_pread(instance, dst, count); | |
192 | * | |
1da177e4 | 193 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 194 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 195 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 196 | * possible) function may be used. |
1da177e4 LT |
197 | */ |
198 | ||
1da177e4 LT |
199 | /* Macros ease life... :-) */ |
200 | #define SETUP_HOSTDATA(in) \ | |
201 | struct NCR5380_hostdata *hostdata = \ | |
202 | (struct NCR5380_hostdata *)(in)->hostdata | |
203 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
204 | ||
710ddd0d | 205 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 206 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 207 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
208 | |
209 | #define HOSTNO instance->host_no | |
210 | #define H_NO(cmd) (cmd)->device->host->host_no | |
211 | ||
636b1ec8 FT |
212 | static int do_abort(struct Scsi_Host *); |
213 | static void do_reset(struct Scsi_Host *); | |
214 | ||
1da177e4 LT |
215 | #ifdef SUPPORT_TAGS |
216 | ||
217 | /* | |
218 | * Functions for handling tagged queuing | |
219 | * ===================================== | |
220 | * | |
221 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
222 | * | |
223 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
224 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
225 | * command has been preempted for a long time. My solution: a bitfield for | |
226 | * remembering used tags. | |
227 | * | |
228 | * There's also the problem that each target has a certain queue size, but we | |
229 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
230 | * returned. So, in this case, the driver internal queue size assumption is | |
231 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 232 | * target. |
1da177e4 LT |
233 | * |
234 | * We're also not allowed running tagged commands as long as an untagged | |
235 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
236 | * condition _must_ be untagged. To keep track whether an untagged command has | |
237 | * been issued, the host->busy array is still employed, as it is without | |
238 | * support for tagged queuing. | |
239 | * | |
240 | * One could suspect that there are possible race conditions between | |
241 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
242 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
243 | * which already guaranteed to be running at most once. It is also the only | |
244 | * place where tags/LUNs are allocated. So no other allocation can slip | |
245 | * between that pair, there could only happen a reselection, which can free a | |
246 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
247 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
248 | */ | |
249 | ||
ca513fc9 | 250 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 251 | { |
c28bda25 | 252 | int target, lun; |
61d739a4 | 253 | struct tag_alloc *ta; |
c28bda25 | 254 | |
ca513fc9 | 255 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
256 | return; |
257 | ||
258 | for (target = 0; target < 8; ++target) { | |
259 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 260 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
261 | bitmap_zero(ta->allocated, MAX_TAGS); |
262 | ta->nr_allocated = 0; | |
263 | /* At the beginning, assume the maximum queue size we could | |
264 | * support (MAX_TAGS). This value will be decreased if the target | |
265 | * returns QUEUE_FULL status. | |
266 | */ | |
267 | ta->queue_size = MAX_TAGS; | |
268 | } | |
1da177e4 | 269 | } |
1da177e4 LT |
270 | } |
271 | ||
272 | ||
273 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
274 | * busy by an untagged command. If the command should use tagged queuing, also | |
275 | * check that there is a free tag and the target's queue won't overflow. This | |
276 | * function should be called with interrupts disabled to avoid race | |
277 | * conditions. | |
c28bda25 | 278 | */ |
1da177e4 | 279 | |
710ddd0d | 280 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 281 | { |
9cb78c16 | 282 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
283 | SETUP_HOSTDATA(cmd->device->host); |
284 | ||
9cb78c16 | 285 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
286 | return 1; |
287 | if (!should_be_tagged || | |
ca513fc9 FT |
288 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
289 | !cmd->device->tagged_supported) | |
c28bda25 | 290 | return 0; |
61d739a4 FT |
291 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
292 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
d65e634a | 293 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
9cb78c16 | 294 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
295 | return 1; |
296 | } | |
297 | return 0; | |
1da177e4 LT |
298 | } |
299 | ||
300 | ||
301 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
302 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
303 | * untagged. | |
304 | */ | |
305 | ||
710ddd0d | 306 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 307 | { |
9cb78c16 | 308 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
309 | SETUP_HOSTDATA(cmd->device->host); |
310 | ||
311 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
312 | * an untagged command. | |
313 | */ | |
314 | if (!should_be_tagged || | |
ca513fc9 FT |
315 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
316 | !cmd->device->tagged_supported) { | |
c28bda25 | 317 | cmd->tag = TAG_NONE; |
9cb78c16 | 318 | hostdata->busy[cmd->device->id] |= (1 << lun); |
d65e634a | 319 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
9cb78c16 | 320 | "command\n", H_NO(cmd), cmd->device->id, lun); |
c28bda25 | 321 | } else { |
61d739a4 | 322 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
323 | |
324 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
325 | set_bit(cmd->tag, ta->allocated); | |
326 | ta->nr_allocated++; | |
d65e634a | 327 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
c28bda25 RZ |
328 | "(now %d tags in use)\n", |
329 | H_NO(cmd), cmd->tag, cmd->device->id, | |
9cb78c16 | 330 | lun, ta->nr_allocated); |
c28bda25 | 331 | } |
1da177e4 LT |
332 | } |
333 | ||
334 | ||
335 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
336 | * unlock the LUN. | |
337 | */ | |
338 | ||
710ddd0d | 339 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 340 | { |
9cb78c16 | 341 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
342 | SETUP_HOSTDATA(cmd->device->host); |
343 | ||
344 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 345 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
d65e634a | 346 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
9cb78c16 | 347 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
348 | } else if (cmd->tag >= MAX_TAGS) { |
349 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
350 | H_NO(cmd), cmd->tag); | |
351 | } else { | |
61d739a4 | 352 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
353 | clear_bit(cmd->tag, ta->allocated); |
354 | ta->nr_allocated--; | |
d65e634a | 355 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
9cb78c16 | 356 | H_NO(cmd), cmd->tag, cmd->device->id, lun); |
c28bda25 | 357 | } |
1da177e4 LT |
358 | } |
359 | ||
360 | ||
ca513fc9 | 361 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 362 | { |
c28bda25 | 363 | int target, lun; |
61d739a4 | 364 | struct tag_alloc *ta; |
c28bda25 | 365 | |
ca513fc9 | 366 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
367 | return; |
368 | ||
369 | for (target = 0; target < 8; ++target) { | |
370 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 371 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
372 | bitmap_zero(ta->allocated, MAX_TAGS); |
373 | ta->nr_allocated = 0; | |
374 | } | |
1da177e4 | 375 | } |
1da177e4 LT |
376 | } |
377 | ||
378 | #endif /* SUPPORT_TAGS */ | |
379 | ||
380 | ||
381 | /* | |
710ddd0d | 382 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
383 | * |
384 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
385 | * transfer. This is possible if the scatter buffers lie on | |
386 | * physical contiguous addresses. | |
387 | * | |
710ddd0d | 388 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 389 | * The command to work on. The first scatter buffer's data are |
25985edc | 390 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
391 | */ |
392 | ||
710ddd0d | 393 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 394 | { |
e3f463b0 | 395 | #if !defined(CONFIG_SUN3) |
c28bda25 | 396 | unsigned long endaddr; |
1da177e4 | 397 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
398 | unsigned long oldlen = cmd->SCp.this_residual; |
399 | int cnt = 1; | |
1da177e4 LT |
400 | #endif |
401 | ||
c28bda25 RZ |
402 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
403 | cmd->SCp.buffers_residual && | |
5a1cb47f | 404 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 405 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 406 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 407 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 408 | ++cnt; |
1da177e4 | 409 | #endif |
c28bda25 RZ |
410 | ++cmd->SCp.buffer; |
411 | --cmd->SCp.buffers_residual; | |
412 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
413 | endaddr += cmd->SCp.buffer->length; | |
414 | } | |
1da177e4 | 415 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 416 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 417 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 418 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 419 | #endif |
e3f463b0 | 420 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
421 | } |
422 | ||
ff50f9ed FT |
423 | /** |
424 | * initialize_SCp - init the scsi pointer field | |
425 | * @cmd: command block to set up | |
1da177e4 | 426 | * |
ff50f9ed | 427 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
428 | */ |
429 | ||
710ddd0d | 430 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 431 | { |
c28bda25 RZ |
432 | /* |
433 | * Initialize the Scsi Pointer field so that all of the commands in the | |
434 | * various queues are valid. | |
1da177e4 | 435 | */ |
c28bda25 | 436 | |
9e0fe44d BH |
437 | if (scsi_bufflen(cmd)) { |
438 | cmd->SCp.buffer = scsi_sglist(cmd); | |
439 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 440 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
441 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
442 | /* ++roman: Try to merge some scatter-buffers if they are at | |
443 | * contiguous physical addresses. | |
444 | */ | |
445 | merge_contiguous_buffers(cmd); | |
446 | } else { | |
447 | cmd->SCp.buffer = NULL; | |
448 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
449 | cmd->SCp.ptr = NULL; |
450 | cmd->SCp.this_residual = 0; | |
c28bda25 | 451 | } |
1da177e4 LT |
452 | } |
453 | ||
636b1ec8 | 454 | /** |
b32ade12 | 455 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 456 | * @instance: controller to poll |
b32ade12 FT |
457 | * @reg1: 5380 register to poll |
458 | * @bit1: Bitmask to check | |
459 | * @val1: Expected value | |
460 | * @reg2: Second 5380 register to poll | |
461 | * @bit2: Second bitmask to check | |
462 | * @val2: Second expected value | |
2f854b82 | 463 | * @wait: Time-out in jiffies |
636b1ec8 | 464 | * |
2f854b82 FT |
465 | * Polls the chip in a reasonably efficient manner waiting for an |
466 | * event to occur. After a short quick poll we begin to yield the CPU | |
467 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
468 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 469 | * |
b32ade12 | 470 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
471 | */ |
472 | ||
b32ade12 FT |
473 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
474 | int reg1, int bit1, int val1, | |
475 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 476 | { |
2f854b82 FT |
477 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
478 | unsigned long deadline = jiffies + wait; | |
479 | unsigned long n; | |
480 | ||
481 | /* Busy-wait for up to 10 ms */ | |
482 | n = min(10000U, jiffies_to_usecs(wait)); | |
483 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 484 | n /= 2000; |
2f854b82 | 485 | do { |
b32ade12 FT |
486 | if ((NCR5380_read(reg1) & bit1) == val1) |
487 | return 0; | |
488 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
489 | return 0; |
490 | cpu_relax(); | |
2f854b82 FT |
491 | } while (n--); |
492 | ||
493 | if (irqs_disabled() || in_interrupt()) | |
494 | return -ETIMEDOUT; | |
636b1ec8 | 495 | |
2f854b82 FT |
496 | /* Repeatedly sleep for 1 ms until deadline */ |
497 | while (time_is_after_jiffies(deadline)) { | |
498 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
499 | if ((NCR5380_read(reg1) & bit1) == val1) |
500 | return 0; | |
501 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 502 | return 0; |
636b1ec8 | 503 | } |
2f854b82 | 504 | |
636b1ec8 FT |
505 | return -ETIMEDOUT; |
506 | } | |
507 | ||
b32ade12 FT |
508 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
509 | int reg, int bit, int val, int wait) | |
510 | { | |
511 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
512 | reg, bit, val, wait); | |
513 | } | |
514 | ||
1da177e4 LT |
515 | #if NDEBUG |
516 | static struct { | |
c28bda25 RZ |
517 | unsigned char mask; |
518 | const char *name; | |
519 | } signals[] = { | |
520 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
521 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
522 | { SR_SEL, "SEL" }, {0, NULL} | |
523 | }, basrs[] = { | |
524 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
525 | }, icrs[] = { | |
526 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
527 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
528 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
529 | {0, NULL} | |
530 | }, mrs[] = { | |
531 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
532 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
533 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
534 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
535 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
536 | {0, NULL} | |
537 | }; | |
1da177e4 | 538 | |
ff50f9ed FT |
539 | /** |
540 | * NCR5380_print - print scsi bus signals | |
541 | * @instance: adapter state to dump | |
1da177e4 | 542 | * |
ff50f9ed | 543 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
544 | */ |
545 | ||
c28bda25 RZ |
546 | static void NCR5380_print(struct Scsi_Host *instance) |
547 | { | |
548 | unsigned char status, data, basr, mr, icr, i; | |
549 | unsigned long flags; | |
550 | ||
551 | local_irq_save(flags); | |
552 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
553 | status = NCR5380_read(STATUS_REG); | |
554 | mr = NCR5380_read(MODE_REG); | |
555 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
556 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
557 | local_irq_restore(flags); | |
558 | printk("STATUS_REG: %02x ", status); | |
559 | for (i = 0; signals[i].mask; ++i) | |
560 | if (status & signals[i].mask) | |
561 | printk(",%s", signals[i].name); | |
562 | printk("\nBASR: %02x ", basr); | |
563 | for (i = 0; basrs[i].mask; ++i) | |
564 | if (basr & basrs[i].mask) | |
565 | printk(",%s", basrs[i].name); | |
566 | printk("\nICR: %02x ", icr); | |
567 | for (i = 0; icrs[i].mask; ++i) | |
568 | if (icr & icrs[i].mask) | |
569 | printk(",%s", icrs[i].name); | |
570 | printk("\nMODE: %02x ", mr); | |
571 | for (i = 0; mrs[i].mask; ++i) | |
572 | if (mr & mrs[i].mask) | |
573 | printk(",%s", mrs[i].name); | |
574 | printk("\n"); | |
1da177e4 LT |
575 | } |
576 | ||
577 | static struct { | |
c28bda25 RZ |
578 | unsigned char value; |
579 | const char *name; | |
1da177e4 | 580 | } phases[] = { |
c28bda25 RZ |
581 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
582 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
583 | {PHASE_UNKNOWN, "UNKNOWN"} | |
584 | }; | |
1da177e4 | 585 | |
ff50f9ed FT |
586 | /** |
587 | * NCR5380_print_phase - show SCSI phase | |
588 | * @instance: adapter to dump | |
1da177e4 | 589 | * |
ff50f9ed | 590 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 591 | * |
ff50f9ed | 592 | * Locks: none |
1da177e4 LT |
593 | */ |
594 | ||
595 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
596 | { | |
c28bda25 RZ |
597 | unsigned char status; |
598 | int i; | |
599 | ||
600 | status = NCR5380_read(STATUS_REG); | |
601 | if (!(status & SR_REQ)) | |
602 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
603 | else { | |
604 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
605 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
606 | ; | |
607 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
608 | } | |
1da177e4 LT |
609 | } |
610 | ||
1da177e4 LT |
611 | #endif |
612 | ||
8c32513b FT |
613 | /** |
614 | * NCR58380_info - report driver and host information | |
615 | * @instance: relevant scsi host instance | |
1da177e4 | 616 | * |
8c32513b | 617 | * For use as the host template info() handler. |
1da177e4 | 618 | * |
8c32513b | 619 | * Locks: none |
1da177e4 LT |
620 | */ |
621 | ||
8c32513b | 622 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 623 | { |
8c32513b FT |
624 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
625 | ||
626 | return hostdata->info; | |
627 | } | |
628 | ||
629 | static void prepare_info(struct Scsi_Host *instance) | |
630 | { | |
631 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
632 | ||
633 | snprintf(hostdata->info, sizeof(hostdata->info), | |
634 | "%s, io_port 0x%lx, n_io_port %d, " | |
635 | "base 0x%lx, irq %d, " | |
636 | "can_queue %d, cmd_per_lun %d, " | |
637 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 638 | "flags { %s%s}, " |
8c32513b FT |
639 | "options { %s} ", |
640 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
641 | instance->base, instance->irq, | |
642 | instance->can_queue, instance->cmd_per_lun, | |
643 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 644 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 645 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
646 | #ifdef DIFFERENTIAL |
647 | "DIFFERENTIAL " | |
648 | #endif | |
1da177e4 | 649 | #ifdef REAL_DMA |
8c32513b | 650 | "REAL_DMA " |
1da177e4 LT |
651 | #endif |
652 | #ifdef PARITY | |
8c32513b | 653 | "PARITY " |
1da177e4 LT |
654 | #endif |
655 | #ifdef SUPPORT_TAGS | |
8c32513b | 656 | "SUPPORT_TAGS " |
1da177e4 | 657 | #endif |
8c32513b | 658 | ""); |
1da177e4 LT |
659 | } |
660 | ||
ff50f9ed FT |
661 | /** |
662 | * NCR5380_print_status - dump controller info | |
663 | * @instance: controller to dump | |
1da177e4 | 664 | * |
ff50f9ed FT |
665 | * Print commands in the various queues, called from NCR5380_abort |
666 | * to aid debugging. | |
1da177e4 LT |
667 | */ |
668 | ||
710ddd0d | 669 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd) |
1da177e4 | 670 | { |
d89537e1 AV |
671 | int i, s; |
672 | unsigned char *command; | |
9cb78c16 | 673 | printk("scsi%d: destination target %d, lun %llu\n", |
d89537e1 AV |
674 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
675 | printk(KERN_CONT " command = "); | |
676 | command = cmd->cmnd; | |
677 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
678 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
679 | printk(KERN_CONT " %02x", command[i]); | |
680 | printk("\n"); | |
1da177e4 LT |
681 | } |
682 | ||
3be1b3ea | 683 | static void __maybe_unused NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 684 | { |
c28bda25 | 685 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 686 | struct scsi_cmnd *ptr; |
c28bda25 | 687 | unsigned long flags; |
d89537e1 | 688 | |
8ad3a593 FT |
689 | NCR5380_dprint(NDEBUG_ANY, instance); |
690 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
c28bda25 RZ |
691 | |
692 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
693 | ||
c28bda25 | 694 | local_irq_save(flags); |
c28bda25 | 695 | if (!hostdata->connected) |
d89537e1 | 696 | printk("scsi%d: no currently connected command\n", HOSTNO); |
c28bda25 | 697 | else |
710ddd0d | 698 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected); |
d89537e1 | 699 | printk("scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 700 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 | 701 | lprint_Scsi_Cmnd(ptr); |
1da177e4 | 702 | |
d89537e1 | 703 | printk("scsi%d: disconnected_queue\n", HOSTNO); |
710ddd0d | 704 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
705 | ptr = NEXT(ptr)) |
706 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 707 | |
c28bda25 | 708 | local_irq_restore(flags); |
d89537e1 | 709 | printk("\n"); |
1da177e4 LT |
710 | } |
711 | ||
710ddd0d | 712 | static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 713 | { |
c28bda25 RZ |
714 | int i, s; |
715 | unsigned char *command; | |
9cb78c16 | 716 | seq_printf(m, "scsi%d: destination target %d, lun %llu\n", |
c28bda25 | 717 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
91c40f24 | 718 | seq_puts(m, " command = "); |
c28bda25 | 719 | command = cmd->cmnd; |
d89537e1 | 720 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); |
c28bda25 | 721 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
d89537e1 | 722 | seq_printf(m, " %02x", command[i]); |
f50332ff | 723 | seq_putc(m, '\n'); |
1da177e4 LT |
724 | } |
725 | ||
4d3d2a54 FT |
726 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
727 | struct Scsi_Host *instance) | |
d89537e1 AV |
728 | { |
729 | struct NCR5380_hostdata *hostdata; | |
710ddd0d | 730 | struct scsi_cmnd *ptr; |
d89537e1 AV |
731 | unsigned long flags; |
732 | ||
733 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
734 | ||
d89537e1 | 735 | local_irq_save(flags); |
d89537e1 AV |
736 | if (!hostdata->connected) |
737 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
738 | else | |
710ddd0d | 739 | show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
d89537e1 | 740 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 741 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 AV |
742 | show_Scsi_Cmnd(ptr, m); |
743 | ||
744 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
710ddd0d | 745 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
746 | ptr = NEXT(ptr)) |
747 | show_Scsi_Cmnd(ptr, m); | |
748 | ||
749 | local_irq_restore(flags); | |
750 | return 0; | |
751 | } | |
1da177e4 | 752 | |
ff50f9ed FT |
753 | /** |
754 | * NCR5380_init - initialise an NCR5380 | |
755 | * @instance: adapter to configure | |
756 | * @flags: control flags | |
1da177e4 | 757 | * |
ff50f9ed FT |
758 | * Initializes *instance and corresponding 5380 chip, |
759 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
760 | * |
761 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 762 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 763 | * |
ff50f9ed | 764 | * Returns 0 for success |
1da177e4 LT |
765 | */ |
766 | ||
95fde7a8 | 767 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 768 | { |
c28bda25 RZ |
769 | int i; |
770 | SETUP_HOSTDATA(instance); | |
2f854b82 | 771 | unsigned long deadline; |
c28bda25 | 772 | |
a53a21e4 | 773 | hostdata->host = instance; |
c28bda25 RZ |
774 | hostdata->id_mask = 1 << instance->this_id; |
775 | hostdata->id_higher_mask = 0; | |
776 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
777 | if (i > hostdata->id_mask) | |
778 | hostdata->id_higher_mask |= i; | |
779 | for (i = 0; i < 8; ++i) | |
780 | hostdata->busy[i] = 0; | |
1da177e4 | 781 | #ifdef SUPPORT_TAGS |
ca513fc9 | 782 | init_tags(hostdata); |
1da177e4 LT |
783 | #endif |
784 | #if defined (REAL_DMA) | |
c28bda25 | 785 | hostdata->dma_len = 0; |
1da177e4 | 786 | #endif |
c28bda25 RZ |
787 | hostdata->connected = NULL; |
788 | hostdata->issue_queue = NULL; | |
789 | hostdata->disconnected_queue = NULL; | |
ef1081cb | 790 | hostdata->flags = flags; |
c28bda25 | 791 | |
a53a21e4 | 792 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
793 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
794 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
795 | 1, instance->host_no); | |
796 | if (!hostdata->work_q) | |
797 | return -ENOMEM; | |
1da177e4 | 798 | |
8c32513b FT |
799 | prepare_info(instance); |
800 | ||
c28bda25 RZ |
801 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
802 | NCR5380_write(MODE_REG, MR_BASE); | |
803 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
804 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 805 | |
2f854b82 FT |
806 | /* Calibrate register polling loop */ |
807 | i = 0; | |
808 | deadline = jiffies + 1; | |
809 | do { | |
810 | cpu_relax(); | |
811 | } while (time_is_after_jiffies(deadline)); | |
812 | deadline += msecs_to_jiffies(256); | |
813 | do { | |
814 | NCR5380_read(STATUS_REG); | |
815 | ++i; | |
816 | cpu_relax(); | |
817 | } while (time_is_after_jiffies(deadline)); | |
818 | hostdata->accesses_per_ms = i / 256; | |
819 | ||
c28bda25 | 820 | return 0; |
1da177e4 LT |
821 | } |
822 | ||
636b1ec8 FT |
823 | /** |
824 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
825 | * @instance: adapter to check | |
826 | * | |
827 | * If the system crashed, it may have crashed with a connected target and | |
828 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
829 | * currently established nexus, which we know nothing about. Failing that | |
830 | * do a bus reset. | |
831 | * | |
832 | * Note that a bus reset will cause the chip to assert IRQ. | |
833 | * | |
834 | * Returns 0 if successful, otherwise -ENXIO. | |
835 | */ | |
836 | ||
837 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
838 | { | |
9c3f0e2b | 839 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
840 | int pass; |
841 | ||
842 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
843 | switch (pass) { | |
844 | case 1: | |
845 | case 3: | |
846 | case 5: | |
847 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
848 | NCR5380_poll_politely(instance, | |
849 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
850 | break; | |
851 | case 2: | |
852 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
853 | do_abort(instance); | |
854 | break; | |
855 | case 4: | |
856 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
857 | do_reset(instance); | |
9c3f0e2b FT |
858 | /* Wait after a reset; the SCSI standard calls for |
859 | * 250ms, we wait 500ms to be on the safe side. | |
860 | * But some Toshiba CD-ROMs need ten times that. | |
861 | */ | |
862 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
863 | msleep(2500); | |
864 | else | |
865 | msleep(500); | |
636b1ec8 FT |
866 | break; |
867 | case 6: | |
868 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
869 | return -ENXIO; | |
870 | } | |
871 | } | |
872 | return 0; | |
873 | } | |
874 | ||
ff50f9ed FT |
875 | /** |
876 | * NCR5380_exit - remove an NCR5380 | |
877 | * @instance: adapter to remove | |
878 | * | |
879 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
880 | */ | |
881 | ||
6323e4fe GU |
882 | static void NCR5380_exit(struct Scsi_Host *instance) |
883 | { | |
a53a21e4 FT |
884 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
885 | ||
886 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 887 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
888 | } |
889 | ||
ff50f9ed FT |
890 | /** |
891 | * NCR5380_queue_command - queue a command | |
892 | * @instance: the relevant SCSI adapter | |
893 | * @cmd: SCSI command | |
1da177e4 | 894 | * |
1bb40589 | 895 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
896 | * twiddling done to the host specific fields of cmd. If the |
897 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
898 | */ |
899 | ||
16b29e75 FT |
900 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
901 | struct scsi_cmnd *cmd) | |
1da177e4 | 902 | { |
16b29e75 | 903 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 904 | struct scsi_cmnd *tmp; |
c28bda25 | 905 | unsigned long flags; |
1da177e4 LT |
906 | |
907 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
908 | switch (cmd->cmnd[0]) { |
909 | case WRITE_6: | |
910 | case WRITE_10: | |
911 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | |
912 | H_NO(cmd)); | |
913 | cmd->result = (DID_ERROR << 16); | |
16b29e75 | 914 | cmd->scsi_done(cmd); |
c28bda25 RZ |
915 | return 0; |
916 | } | |
1da177e4 LT |
917 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
918 | ||
c28bda25 RZ |
919 | /* |
920 | * We use the host_scribble field as a pointer to the next command | |
921 | * in a queue | |
922 | */ | |
923 | ||
3130d905 | 924 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
925 | cmd->result = 0; |
926 | ||
927 | /* | |
928 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
929 | * commands are added to the head of the queue since any command will | |
930 | * clear the contingent allegiance condition that exists and the | |
931 | * sense data is only guaranteed to be valid while the condition exists. | |
932 | */ | |
933 | ||
c28bda25 RZ |
934 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
935 | * Otherwise a running NCR5380_main may steal the lock. | |
936 | * Lock before actually inserting due to fairness reasons explained in | |
937 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
938 | * to release the lock. | |
939 | * Stop timer for this command while waiting for the lock, or timeouts | |
940 | * may happen (and they really do), and it's no good if the command doesn't | |
941 | * appear in any of the queues. | |
942 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
943 | * because also a timer int can trigger an abort or reset, which would | |
944 | * alter queues and touch the lock. | |
945 | */ | |
e3c3da67 | 946 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
947 | return SCSI_MLQUEUE_HOST_BUSY; |
948 | ||
949 | local_irq_save(flags); | |
950 | ||
ff50f9ed FT |
951 | /* |
952 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
953 | * commands are added to the head of the queue since any command will | |
954 | * clear the contingent allegiance condition that exists and the | |
955 | * sense data is only guaranteed to be valid while the condition exists. | |
956 | */ | |
957 | ||
c28bda25 RZ |
958 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
959 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 960 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
961 | hostdata->issue_queue = cmd; |
962 | } else { | |
710ddd0d | 963 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
964 | NEXT(tmp); tmp = NEXT(tmp)) |
965 | ; | |
966 | LIST(cmd, tmp); | |
3130d905 | 967 | SET_NEXT(tmp, cmd); |
c28bda25 RZ |
968 | } |
969 | local_irq_restore(flags); | |
970 | ||
d65e634a | 971 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
c28bda25 RZ |
972 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
973 | ||
010e89d1 FT |
974 | /* Kick off command processing */ |
975 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 976 | return 0; |
1da177e4 LT |
977 | } |
978 | ||
e3c3da67 FT |
979 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
980 | { | |
981 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
982 | ||
983 | /* Caller does the locking needed to set & test these data atomically */ | |
984 | if (!hostdata->disconnected_queue && | |
985 | !hostdata->issue_queue && | |
986 | !hostdata->connected && | |
987 | !hostdata->retain_dma_intr) | |
988 | NCR5380_release_dma_irq(instance); | |
989 | } | |
990 | ||
ff50f9ed FT |
991 | /** |
992 | * NCR5380_main - NCR state machines | |
1da177e4 | 993 | * |
ff50f9ed FT |
994 | * NCR5380_main is a coroutine that runs as long as more work can |
995 | * be done on the NCR5380 host adapters in a system. Both | |
996 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
997 | * in case it is not running. | |
c28bda25 | 998 | * |
ff50f9ed | 999 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
1000 | */ |
1001 | ||
b312b38c | 1002 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 1003 | { |
a53a21e4 FT |
1004 | struct NCR5380_hostdata *hostdata = |
1005 | container_of(work, struct NCR5380_hostdata, main_task); | |
1006 | struct Scsi_Host *instance = hostdata->host; | |
710ddd0d | 1007 | struct scsi_cmnd *tmp, *prev; |
c28bda25 RZ |
1008 | int done; |
1009 | unsigned long flags; | |
1010 | ||
1011 | /* | |
c28bda25 RZ |
1012 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
1013 | * because also a timer int can trigger an abort or reset, which can | |
1014 | * alter queues and touch the Falcon lock. | |
1015 | */ | |
1016 | ||
c28bda25 RZ |
1017 | local_save_flags(flags); |
1018 | do { | |
1019 | local_irq_disable(); /* Freeze request queues */ | |
1020 | done = 1; | |
1021 | ||
1022 | if (!hostdata->connected) { | |
d65e634a | 1023 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
1024 | /* |
1025 | * Search through the issue_queue for a command destined | |
1026 | * for a target that's not busy. | |
1027 | */ | |
1da177e4 | 1028 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 1029 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
1030 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
1031 | ; | |
1032 | /*printk("%p ", tmp);*/ | |
1033 | if ((tmp == prev) && tmp) | |
1034 | printk(" LOOP\n"); | |
1035 | /* else printk("\n"); */ | |
1da177e4 | 1036 | #endif |
710ddd0d | 1037 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 1038 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 1039 | u8 lun = tmp->device->lun; |
1da177e4 | 1040 | |
e3f463b0 FT |
1041 | dprintk(NDEBUG_LISTS, |
1042 | "MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
1043 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], | |
1044 | lun); | |
c28bda25 RZ |
1045 | /* When we find one, remove it from the issue queue. */ |
1046 | /* ++guenther: possible race with Falcon locking */ | |
1047 | if ( | |
1da177e4 | 1048 | #ifdef SUPPORT_TAGS |
c28bda25 | 1049 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 1050 | #else |
9cb78c16 | 1051 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 1052 | #endif |
c28bda25 RZ |
1053 | ) { |
1054 | /* ++guenther: just to be sure, this must be atomic */ | |
1055 | local_irq_disable(); | |
1056 | if (prev) { | |
1057 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 1058 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
1059 | } else { |
1060 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1061 | hostdata->issue_queue = NEXT(tmp); | |
1062 | } | |
3130d905 | 1063 | SET_NEXT(tmp, NULL); |
ef1081cb | 1064 | hostdata->retain_dma_intr++; |
c28bda25 RZ |
1065 | |
1066 | /* reenable interrupts after finding one */ | |
1067 | local_irq_restore(flags); | |
1068 | ||
1069 | /* | |
1070 | * Attempt to establish an I_T_L nexus here. | |
1071 | * On success, instance->hostdata->connected is set. | |
1072 | * On failure, we must add the command back to the | |
1073 | * issue queue so we can keep trying. | |
1074 | */ | |
d65e634a | 1075 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 1076 | "lun %d removed from issue_queue\n", |
9cb78c16 | 1077 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
1078 | /* |
1079 | * REQUEST SENSE commands are issued without tagged | |
1080 | * queueing, even on SCSI-II devices because the | |
1081 | * contingent allegiance condition exists for the | |
1082 | * entire unit. | |
1083 | */ | |
1084 | /* ++roman: ...and the standard also requires that | |
1085 | * REQUEST SENSE command are untagged. | |
1086 | */ | |
1087 | ||
1da177e4 | 1088 | #ifdef SUPPORT_TAGS |
c28bda25 | 1089 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1090 | #endif |
76f13b93 | 1091 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 1092 | /* OK or bad target */ |
e3c3da67 | 1093 | local_irq_disable(); |
ef1081cb | 1094 | hostdata->retain_dma_intr--; |
e3c3da67 FT |
1095 | maybe_release_dma_irq(instance); |
1096 | local_irq_restore(flags); | |
c28bda25 | 1097 | } else { |
1f1b0c74 | 1098 | /* Need to retry */ |
c28bda25 RZ |
1099 | local_irq_disable(); |
1100 | LIST(tmp, hostdata->issue_queue); | |
3130d905 | 1101 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 1102 | hostdata->issue_queue = tmp; |
1da177e4 | 1103 | #ifdef SUPPORT_TAGS |
c28bda25 | 1104 | cmd_free_tag(tmp); |
1da177e4 | 1105 | #endif |
ef1081cb | 1106 | hostdata->retain_dma_intr--; |
c28bda25 | 1107 | local_irq_restore(flags); |
1d3db59d | 1108 | done = 0; |
d65e634a | 1109 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 | 1110 | "returned to issue_queue\n", HOSTNO); |
c28bda25 | 1111 | } |
1f1b0c74 FT |
1112 | if (hostdata->connected) |
1113 | break; | |
c28bda25 RZ |
1114 | } /* if target/lun/target queue is not busy */ |
1115 | } /* for issue_queue */ | |
1116 | } /* if (!hostdata->connected) */ | |
1117 | ||
1118 | if (hostdata->connected | |
1da177e4 | 1119 | #ifdef REAL_DMA |
c28bda25 | 1120 | && !hostdata->dma_len |
1da177e4 | 1121 | #endif |
c28bda25 RZ |
1122 | ) { |
1123 | local_irq_restore(flags); | |
d65e634a | 1124 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1125 | HOSTNO); |
1126 | NCR5380_information_transfer(instance); | |
d65e634a | 1127 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1128 | done = 0; |
1129 | } | |
1130 | } while (!done); | |
c28bda25 | 1131 | local_irq_restore(flags); |
1da177e4 LT |
1132 | } |
1133 | ||
1134 | ||
1135 | #ifdef REAL_DMA | |
1136 | /* | |
1137 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1138 | * | |
1139 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1140 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1141 | * |
1142 | * Inputs : instance - this instance of the NCR5380. | |
1143 | * | |
1144 | */ | |
1145 | ||
c28bda25 | 1146 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1147 | { |
c28bda25 | 1148 | SETUP_HOSTDATA(instance); |
01bd9081 | 1149 | int transferred; |
e3f463b0 | 1150 | unsigned char **data; |
c28bda25 | 1151 | volatile int *count; |
e3f463b0 FT |
1152 | int saved_data = 0, overrun = 0; |
1153 | unsigned char p; | |
c28bda25 | 1154 | |
ef1081cb | 1155 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1156 | p = hostdata->connected->SCp.phase; |
1157 | if (p & SR_IO) { | |
1158 | udelay(10); | |
1159 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1160 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1161 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1162 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1163 | overrun = 1; | |
d65e634a | 1164 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1165 | } |
1166 | } | |
1167 | } | |
1168 | ||
e3f463b0 FT |
1169 | #if defined(CONFIG_SUN3) |
1170 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1171 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1172 | instance->host_no); | |
1173 | BUG(); | |
1174 | } | |
1175 | ||
1176 | /* make sure we're not stuck in a data phase */ | |
1177 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1178 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1179 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1180 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1181 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1182 | instance->host_no); | |
1183 | BUG(); | |
1184 | } | |
1185 | #endif | |
1186 | ||
c28bda25 RZ |
1187 | NCR5380_write(MODE_REG, MR_BASE); |
1188 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1189 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1190 | |
01bd9081 | 1191 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1192 | hostdata->dma_len = 0; |
1193 | ||
1194 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1195 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1196 | *data += transferred; |
1197 | *count -= transferred; | |
c28bda25 | 1198 | |
ef1081cb | 1199 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1200 | int cnt, toPIO; |
1201 | ||
c28bda25 | 1202 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1203 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1204 | if (overrun) { |
d65e634a | 1205 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1206 | *(*data)++ = saved_data; |
1207 | (*count)--; | |
1208 | cnt--; | |
1209 | toPIO--; | |
1210 | } | |
d65e634a | 1211 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1212 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1213 | *count -= toPIO - cnt; | |
1214 | } | |
1da177e4 | 1215 | } |
1da177e4 LT |
1216 | } |
1217 | #endif /* REAL_DMA */ | |
1218 | ||
1219 | ||
ff50f9ed FT |
1220 | /** |
1221 | * NCR5380_intr - generic NCR5380 irq handler | |
1222 | * @irq: interrupt number | |
1223 | * @dev_id: device info | |
1da177e4 | 1224 | * |
ff50f9ed FT |
1225 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1226 | * from the disconnected queue, and restarting NCR5380_main() | |
1227 | * as required. | |
cd400825 FT |
1228 | * |
1229 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1230 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1231 | * Three of these six conditions are latched in the Bus and Status Register: | |
1232 | * - End of DMA (cleared by ending DMA Mode) | |
1233 | * - Parity error (cleared by reading RPIR) | |
1234 | * - Loss of BSY (cleared by reading RPIR) | |
1235 | * Two conditions have flag bits that are not latched: | |
1236 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1237 | * - Bus reset (non-maskable) | |
1238 | * The remaining condition has no flag bit at all: | |
1239 | * - Selection/reselection | |
1240 | * | |
1241 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1242 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1243 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1244 | * interrupts will not be lost (they can be on the DP5380)." | |
1245 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1246 | * | |
1247 | * Checking for bus reset by reading RST is futile because of interrupt | |
1248 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1249 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1250 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1251 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1252 | */ |
1253 | ||
c28bda25 | 1254 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1255 | { |
a53a21e4 | 1256 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1257 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1258 | int handled = 0; |
c28bda25 RZ |
1259 | unsigned char basr; |
1260 | ||
c28bda25 | 1261 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1262 | if (basr & BASR_IRQ) { |
cd400825 FT |
1263 | unsigned char mr = NCR5380_read(MODE_REG); |
1264 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1265 | ||
1266 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1267 | HOSTNO, irq, basr, sr, mr); | |
1da177e4 LT |
1268 | |
1269 | #if defined(REAL_DMA) | |
cd400825 FT |
1270 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1271 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1272 | * We ack IRQ after clearing Mode Register. Workarounds | |
1273 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1274 | */ |
1275 | ||
cd400825 | 1276 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO); |
c28bda25 | 1277 | |
cd400825 FT |
1278 | if (hostdata->connected) { |
1279 | NCR5380_dma_complete(instance); | |
1280 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1281 | } else { | |
1282 | NCR5380_write(MODE_REG, MR_BASE); | |
1283 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1284 | } | |
1285 | } else | |
1da177e4 | 1286 | #endif /* REAL_DMA */ |
cd400825 FT |
1287 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1288 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1289 | /* Probably reselected */ | |
1290 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1291 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1292 | ||
1293 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1294 | HOSTNO); | |
1295 | ||
1296 | if (!hostdata->connected) { | |
1297 | NCR5380_reselect(instance); | |
1298 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1299 | } | |
1300 | if (!hostdata->connected) | |
1301 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1302 | } else { | |
1303 | /* Probably Bus Reset */ | |
1304 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1305 | ||
1306 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO); | |
e3f463b0 | 1307 | #ifdef SUN3_SCSI_VME |
cd400825 | 1308 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1309 | #endif |
cd400825 | 1310 | } |
c28bda25 | 1311 | handled = 1; |
cd400825 FT |
1312 | } else { |
1313 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1314 | #ifdef SUN3_SCSI_VME |
1315 | dregs->csr |= CSR_DMA_ENABLE; | |
1316 | #endif | |
c28bda25 RZ |
1317 | } |
1318 | ||
c28bda25 | 1319 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1320 | } |
1321 | ||
c28bda25 | 1322 | /* |
710ddd0d FT |
1323 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1324 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1325 | * |
1326 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1327 | * including ARBITRATION, SELECTION, and initial message out for |
1328 | * IDENTIFY and queue messages. | |
1da177e4 | 1329 | * |
c28bda25 | 1330 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1331 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1332 | * |
6323876f FT |
1333 | * Returns : -1 if selection failed but should be retried. |
1334 | * 0 if selection failed and should not be retried. | |
1335 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1336 | * |
c28bda25 RZ |
1337 | * Side effects : |
1338 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1339 | * with registers as they should have been on entry - ie |
1340 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1341 | * will cease to drive any SCSI bus signals. | |
1342 | * | |
c28bda25 RZ |
1343 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1344 | * instance->connected will be set to cmd. | |
1345 | * SELECT interrupt will be disabled. | |
1da177e4 | 1346 | * |
c28bda25 | 1347 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1348 | * cmd->result host byte set to DID_BAD_TARGET. |
1349 | */ | |
1350 | ||
710ddd0d | 1351 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1352 | { |
c28bda25 RZ |
1353 | SETUP_HOSTDATA(instance); |
1354 | unsigned char tmp[3], phase; | |
1355 | unsigned char *data; | |
1356 | int len; | |
ae753a33 | 1357 | int err; |
c28bda25 RZ |
1358 | unsigned long flags; |
1359 | ||
8ad3a593 | 1360 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1361 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1362 | instance->this_id); |
1363 | ||
1364 | /* | |
1365 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1366 | * data bus during SELECTION. | |
1367 | */ | |
1368 | ||
1369 | local_irq_save(flags); | |
1370 | if (hostdata->connected) { | |
1371 | local_irq_restore(flags); | |
1372 | return -1; | |
1373 | } | |
1374 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1375 | |
c28bda25 RZ |
1376 | /* |
1377 | * Start arbitration. | |
1378 | */ | |
1da177e4 | 1379 | |
c28bda25 RZ |
1380 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1381 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1382 | |
55500d9b FT |
1383 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1384 | * Bus Free Delay, arbitration will begin. | |
1385 | */ | |
c28bda25 | 1386 | |
55500d9b | 1387 | local_irq_restore(flags); |
b32ade12 FT |
1388 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1389 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1390 | ICR_ARBITRATION_PROGRESS, HZ); | |
1391 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { | |
1392 | /* Reselection interrupt */ | |
1393 | return -1; | |
1394 | } | |
1395 | if (err < 0) { | |
1396 | NCR5380_write(MODE_REG, MR_BASE); | |
1397 | shost_printk(KERN_ERR, instance, | |
1398 | "select: arbitration timeout\n"); | |
1399 | return -1; | |
c28bda25 | 1400 | } |
c28bda25 | 1401 | |
55500d9b | 1402 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1403 | udelay(3); |
1404 | ||
1405 | /* Check for lost arbitration */ | |
1406 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1407 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1408 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1409 | hostdata->connected) { | |
1410 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1411 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 RZ |
1412 | HOSTNO); |
1413 | return -1; | |
1414 | } | |
1da177e4 | 1415 | |
cf13b083 FT |
1416 | /* After/during arbitration, BSY should be asserted. |
1417 | * IBM DPES-31080 Version S31Q works now | |
1418 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1419 | */ | |
c28bda25 RZ |
1420 | NCR5380_write(INITIATOR_COMMAND_REG, |
1421 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1422 | ||
c28bda25 RZ |
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 | 1432 | |
72064a78 FT |
1433 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1434 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
c28bda25 | 1435 | return -1; |
c28bda25 | 1436 | |
d65e634a | 1437 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1438 | |
1439 | /* | |
1440 | * Now that we have won arbitration, start Selection process, asserting | |
1441 | * the host and target ID's on the SCSI bus. | |
1442 | */ | |
1443 | ||
1444 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1445 | ||
1446 | /* | |
1447 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1448 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1449 | * phase immediately after selection. | |
1450 | */ | |
1451 | ||
1452 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1453 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1454 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1455 | |
c28bda25 RZ |
1456 | /* |
1457 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1458 | * otherwise we will trigger an interrupt. | |
1459 | */ | |
1460 | ||
1461 | if (hostdata->connected) { | |
1462 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1463 | return -1; | |
1464 | } | |
1465 | ||
1466 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 1467 | |
c28bda25 RZ |
1468 | /* |
1469 | * The initiator shall then wait at least two deskew delays and release | |
1470 | * the BSY signal. | |
1471 | */ | |
1472 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1473 | ||
1474 | /* Reset BSY */ | |
1475 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1476 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1477 | ||
1478 | /* | |
1479 | * Something weird happens when we cease to drive BSY - looks | |
1480 | * like the board/chip is letting us do another read before the | |
1481 | * appropriate propagation delay has expired, and we're confusing | |
1482 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1483 | * | |
1484 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1485 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1486 | * tighter 'C' code breaks and requires this) solves the problem - | |
1487 | * the 1 us delay is arbitrary, and only used because this delay will | |
1488 | * be the same on other platforms and since it works here, it should | |
1489 | * work there. | |
1490 | * | |
1491 | * wingel suggests that this could be due to failing to wait | |
1492 | * one deskew delay. | |
1493 | */ | |
1da177e4 | 1494 | |
c28bda25 | 1495 | udelay(1); |
1da177e4 | 1496 | |
d65e634a | 1497 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1498 | |
c28bda25 RZ |
1499 | /* |
1500 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1501 | * selection. | |
1502 | */ | |
1da177e4 | 1503 | |
ae753a33 FT |
1504 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1505 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1506 | |
1507 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1508 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1509 | NCR5380_reselect(instance); | |
cd400825 FT |
1510 | if (!hostdata->connected) |
1511 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
c28bda25 RZ |
1512 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
1513 | HOSTNO); | |
c28bda25 RZ |
1514 | return -1; |
1515 | } | |
1da177e4 | 1516 | |
ae753a33 | 1517 | if (err < 0) { |
c28bda25 | 1518 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1519 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1520 | #ifdef SUPPORT_TAGS |
c28bda25 | 1521 | cmd_free_tag(cmd); |
1da177e4 | 1522 | #endif |
c28bda25 RZ |
1523 | cmd->scsi_done(cmd); |
1524 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1525 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1526 | return 0; |
1527 | } | |
1528 | ||
ae753a33 FT |
1529 | /* |
1530 | * No less than two deskew delays after the initiator detects the | |
1531 | * BSY signal is true, it shall release the SEL signal and may | |
1532 | * change the DATA BUS. -wingel | |
1533 | */ | |
1534 | ||
1535 | udelay(1); | |
1536 | ||
1537 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1538 | ||
c28bda25 RZ |
1539 | /* |
1540 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1541 | * was true but before BSY was false during selection, the information | |
1542 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1543 | * IDENTIFY message. | |
1544 | * | |
1545 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1546 | * message (2 bytes) with a tag ID that we increment with every command | |
1547 | * until it wraps back to 0. | |
1548 | * | |
1549 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1550 | * which claim to support tagged queuing but fail when more than | |
1551 | * some number of commands are issued at once. | |
1552 | */ | |
1553 | ||
1554 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1555 | |
1556 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
1557 | if (err < 0) { | |
1558 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1559 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1560 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1561 | return -1; | |
1562 | } | |
c28bda25 | 1563 | |
d65e634a | 1564 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1565 | HOSTNO, cmd->device->id); |
1566 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1567 | |
1568 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1569 | if (cmd->tag != TAG_NONE) { |
1570 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1571 | tmp[2] = cmd->tag; | |
1572 | len = 3; | |
1573 | } else | |
1574 | len = 1; | |
1da177e4 | 1575 | #else |
c28bda25 RZ |
1576 | len = 1; |
1577 | cmd->tag = 0; | |
1da177e4 LT |
1578 | #endif /* SUPPORT_TAGS */ |
1579 | ||
c28bda25 RZ |
1580 | /* Send message(s) */ |
1581 | data = tmp; | |
1582 | phase = PHASE_MSGOUT; | |
1583 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1584 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 RZ |
1585 | /* XXX need to handle errors here */ |
1586 | hostdata->connected = cmd; | |
1da177e4 | 1587 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1588 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1589 | #endif | |
e3f463b0 FT |
1590 | #ifdef SUN3_SCSI_VME |
1591 | dregs->csr |= CSR_INTR; | |
1592 | #endif | |
1da177e4 | 1593 | |
c28bda25 | 1594 | initialize_SCp(cmd); |
1da177e4 | 1595 | |
c28bda25 | 1596 | return 0; |
1da177e4 LT |
1597 | } |
1598 | ||
c28bda25 RZ |
1599 | /* |
1600 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1601 | * unsigned char *phase, int *count, unsigned char **data) |
1602 | * | |
1603 | * Purpose : transfers data in given phase using polled I/O | |
1604 | * | |
c28bda25 RZ |
1605 | * Inputs : instance - instance of driver, *phase - pointer to |
1606 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1607 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1608 | * |
1da177e4 | 1609 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1610 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1611 | * is in same phase. |
1612 | * | |
c28bda25 | 1613 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1614 | * |
1615 | * XXX Note : handling for bus free may be useful. | |
1616 | */ | |
1617 | ||
1618 | /* | |
c28bda25 | 1619 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1620 | * IS 100% reliable, and for the actual data transfer where speed |
1621 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1622 | */ | |
1623 | ||
c28bda25 RZ |
1624 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1625 | unsigned char *phase, int *count, | |
1626 | unsigned char **data) | |
1da177e4 | 1627 | { |
c28bda25 RZ |
1628 | register unsigned char p = *phase, tmp; |
1629 | register int c = *count; | |
1630 | register unsigned char *d = *data; | |
1631 | ||
1632 | /* | |
1633 | * The NCR5380 chip will only drive the SCSI bus when the | |
1634 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1635 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1636 | */ |
1da177e4 | 1637 | |
c28bda25 | 1638 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1639 | |
c28bda25 RZ |
1640 | do { |
1641 | /* | |
1642 | * Wait for assertion of REQ, after which the phase bits will be | |
1643 | * valid | |
1644 | */ | |
686f3990 FT |
1645 | |
1646 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1647 | break; | |
1da177e4 | 1648 | |
d65e634a | 1649 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1650 | |
c28bda25 | 1651 | /* Check for phase mismatch */ |
686f3990 | 1652 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1653 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1654 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1655 | break; |
1656 | } | |
1da177e4 | 1657 | |
c28bda25 RZ |
1658 | /* Do actual transfer from SCSI bus to / from memory */ |
1659 | if (!(p & SR_IO)) | |
1660 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1661 | else | |
1662 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1663 | |
c28bda25 | 1664 | ++d; |
1da177e4 | 1665 | |
c28bda25 RZ |
1666 | /* |
1667 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1668 | * should drop ATN on the last byte of the message phase | |
1669 | * after REQ has been asserted for the handshake but before | |
1670 | * the initiator raises ACK. | |
1671 | */ | |
1da177e4 | 1672 | |
c28bda25 RZ |
1673 | if (!(p & SR_IO)) { |
1674 | if (!((p & SR_MSG) && c > 1)) { | |
1675 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1676 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1677 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1678 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1679 | } else { | |
1680 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1681 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1682 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1683 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1684 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1685 | } | |
1686 | } else { | |
8ad3a593 | 1687 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1688 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1689 | } | |
1da177e4 | 1690 | |
a2edc4a6 FT |
1691 | if (NCR5380_poll_politely(instance, |
1692 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1693 | break; | |
c28bda25 | 1694 | |
d65e634a | 1695 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1696 | |
1697 | /* | |
1698 | * We have several special cases to consider during REQ/ACK handshaking : | |
1699 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1700 | * message. ATN must be dropped as ACK is dropped. | |
1701 | * | |
1702 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1703 | * message. We must exit with ACK asserted, so that the calling | |
1704 | * code may raise ATN before dropping ACK to reject the message. | |
1705 | * | |
1706 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1707 | */ | |
1708 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1709 | if (p == PHASE_MSGOUT && c > 1) | |
1710 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1711 | else | |
1712 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1713 | } | |
1714 | } while (--c); | |
1715 | ||
d65e634a | 1716 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1717 | |
1718 | *count = c; | |
1719 | *data = d; | |
1720 | tmp = NCR5380_read(STATUS_REG); | |
1721 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1722 | * asserted or if ACK hasn't been released yet. The latter applies if |
1723 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1724 | */ |
a2edc4a6 | 1725 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1726 | *phase = tmp & PHASE_MASK; |
1727 | else | |
1728 | *phase = PHASE_UNKNOWN; | |
1729 | ||
1730 | if (!c || (*phase == p)) | |
1731 | return 0; | |
1732 | else | |
1733 | return -1; | |
1da177e4 LT |
1734 | } |
1735 | ||
636b1ec8 FT |
1736 | /** |
1737 | * do_reset - issue a reset command | |
1738 | * @instance: adapter to reset | |
1739 | * | |
1740 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1741 | * back into sane shape. | |
1742 | * | |
1743 | * This clears the reset interrupt flag because there may be no handler for | |
1744 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1745 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1746 | */ | |
1747 | ||
1748 | static void do_reset(struct Scsi_Host *instance) | |
1749 | { | |
1750 | unsigned long flags; | |
1751 | ||
1752 | local_irq_save(flags); | |
1753 | NCR5380_write(TARGET_COMMAND_REG, | |
1754 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1755 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1756 | udelay(50); | |
1757 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1758 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1759 | local_irq_restore(flags); | |
1760 | } | |
1761 | ||
80d3eb6d FT |
1762 | /** |
1763 | * do_abort - abort the currently established nexus by going to | |
1764 | * MESSAGE OUT phase and sending an ABORT message. | |
1765 | * @instance: relevant scsi host instance | |
c28bda25 | 1766 | * |
80d3eb6d | 1767 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1768 | */ |
1769 | ||
a53a21e4 | 1770 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1771 | { |
c28bda25 RZ |
1772 | unsigned char tmp, *msgptr, phase; |
1773 | int len; | |
80d3eb6d | 1774 | int rc; |
c28bda25 RZ |
1775 | |
1776 | /* Request message out phase */ | |
1da177e4 | 1777 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1778 | |
1779 | /* | |
1780 | * Wait for the target to indicate a valid phase by asserting | |
1781 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1782 | * and can immediately send the ABORT message, or we'll have some | |
1783 | * other phase and will have to source/sink data. | |
1784 | * | |
1785 | * We really don't care what value was on the bus or what value | |
1786 | * the target sees, so we just handshake. | |
1787 | */ | |
1788 | ||
80d3eb6d FT |
1789 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1790 | if (rc < 0) | |
1791 | goto timeout; | |
1792 | ||
1793 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1794 | |
1795 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1796 | ||
80d3eb6d FT |
1797 | if (tmp != PHASE_MSGOUT) { |
1798 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1799 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1800 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1801 | if (rc < 0) | |
1802 | goto timeout; | |
c28bda25 RZ |
1803 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1804 | } | |
1805 | ||
1806 | tmp = ABORT; | |
1807 | msgptr = &tmp; | |
1808 | len = 1; | |
1809 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1810 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1811 | |
1812 | /* | |
1813 | * If we got here, and the command completed successfully, | |
1814 | * we're about to go into bus free state. | |
1815 | */ | |
1816 | ||
1817 | return len ? -1 : 0; | |
80d3eb6d FT |
1818 | |
1819 | timeout: | |
1820 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1821 | return -1; | |
1da177e4 LT |
1822 | } |
1823 | ||
1824 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1825 | /* |
1826 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1827 | * unsigned char *phase, int *count, unsigned char **data) |
1828 | * | |
1829 | * Purpose : transfers data in given phase using either real | |
1830 | * or pseudo DMA. | |
1831 | * | |
c28bda25 RZ |
1832 | * Inputs : instance - instance of driver, *phase - pointer to |
1833 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1834 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1835 | * |
1da177e4 | 1836 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1837 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1838 | * is in same phase. |
1839 | * | |
c28bda25 | 1840 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1841 | * |
1842 | */ | |
1843 | ||
1844 | ||
c28bda25 RZ |
1845 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1846 | unsigned char *phase, int *count, | |
1847 | unsigned char **data) | |
1da177e4 | 1848 | { |
c28bda25 RZ |
1849 | SETUP_HOSTDATA(instance); |
1850 | register int c = *count; | |
1851 | register unsigned char p = *phase; | |
e3f463b0 FT |
1852 | unsigned long flags; |
1853 | ||
1854 | #if defined(CONFIG_SUN3) | |
1855 | /* sanity check */ | |
1856 | if (!sun3_dma_setup_done) { | |
1857 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1858 | instance->host_no); | |
1859 | BUG(); | |
1860 | } | |
1861 | hostdata->dma_len = c; | |
1862 | ||
1863 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1864 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1865 | c, (p & SR_IO) ? "to" : "from", *data); | |
1866 | ||
1867 | /* netbsd turns off ints here, why not be safe and do it too */ | |
1868 | local_irq_save(flags); | |
1869 | ||
1870 | /* send start chain */ | |
1871 | sun3scsi_dma_start(c, *data); | |
1872 | ||
cd400825 FT |
1873 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1874 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1875 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1876 | if (p & SR_IO) { |
e3f463b0 | 1877 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1878 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1879 | } else { | |
e3f463b0 | 1880 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1881 | NCR5380_write(START_DMA_SEND_REG, 0); |
1882 | } | |
1883 | ||
1884 | #ifdef SUN3_SCSI_VME | |
1885 | dregs->csr |= CSR_DMA_ENABLE; | |
1886 | #endif | |
1887 | ||
1888 | local_irq_restore(flags); | |
1889 | ||
1890 | sun3_dma_active = 1; | |
1891 | ||
1892 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1893 | register unsigned char *d = *data; |
1894 | unsigned char tmp; | |
c28bda25 RZ |
1895 | |
1896 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1897 | *phase = tmp; | |
1898 | return -1; | |
1899 | } | |
1da177e4 | 1900 | |
ef1081cb FT |
1901 | if (hostdata->read_overruns && (p & SR_IO)) |
1902 | c -= hostdata->read_overruns; | |
1da177e4 | 1903 | |
d65e634a | 1904 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1905 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1906 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1907 | |
c28bda25 | 1908 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1909 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1910 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1911 | |
ef1081cb | 1912 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1913 | /* On the Medusa, it is a must to initialize the DMA before |
1914 | * starting the NCR. This is also the cleaner way for the TT. | |
1915 | */ | |
1916 | local_irq_save(flags); | |
1917 | hostdata->dma_len = (p & SR_IO) ? | |
1918 | NCR5380_dma_read_setup(instance, d, c) : | |
1919 | NCR5380_dma_write_setup(instance, d, c); | |
1920 | local_irq_restore(flags); | |
1921 | } | |
1922 | ||
1923 | if (p & SR_IO) | |
1924 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1925 | else { | |
1926 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1927 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1928 | } | |
1929 | ||
ef1081cb | 1930 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1931 | /* On the Falcon, the DMA setup must be done after the last */ |
1932 | /* NCR access, else the DMA setup gets trashed! | |
1933 | */ | |
1934 | local_irq_save(flags); | |
1935 | hostdata->dma_len = (p & SR_IO) ? | |
1936 | NCR5380_dma_read_setup(instance, d, c) : | |
1937 | NCR5380_dma_write_setup(instance, d, c); | |
1938 | local_irq_restore(flags); | |
1939 | } | |
e3f463b0 FT |
1940 | #endif /* !defined(CONFIG_SUN3) */ |
1941 | ||
c28bda25 | 1942 | return 0; |
1da177e4 LT |
1943 | } |
1944 | #endif /* defined(REAL_DMA) */ | |
1945 | ||
1946 | /* | |
1947 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1948 | * | |
c28bda25 RZ |
1949 | * Purpose : run through the various SCSI phases and do as the target |
1950 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1951 | * instance->connected. |
1952 | * | |
1953 | * Inputs : instance, instance for which we are doing commands | |
1954 | * | |
c28bda25 | 1955 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1956 | * modified if a command disconnects, *instance->connected will |
1957 | * change. | |
1958 | * | |
c28bda25 RZ |
1959 | * XXX Note : we need to watch for bus free or a reset condition here |
1960 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1961 | */ |
c28bda25 RZ |
1962 | |
1963 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1964 | { |
c28bda25 RZ |
1965 | SETUP_HOSTDATA(instance); |
1966 | unsigned long flags; | |
1967 | unsigned char msgout = NOP; | |
1968 | int sink = 0; | |
1969 | int len; | |
1da177e4 | 1970 | #if defined(REAL_DMA) |
c28bda25 | 1971 | int transfersize; |
1da177e4 | 1972 | #endif |
c28bda25 RZ |
1973 | unsigned char *data; |
1974 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1975 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
c28bda25 | 1976 | |
e3f463b0 FT |
1977 | #ifdef SUN3_SCSI_VME |
1978 | dregs->csr |= CSR_INTR; | |
1979 | #endif | |
1980 | ||
c28bda25 RZ |
1981 | while (1) { |
1982 | tmp = NCR5380_read(STATUS_REG); | |
1983 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1984 | if (tmp & SR_REQ) { | |
1985 | phase = (tmp & PHASE_MASK); | |
1986 | if (phase != old_phase) { | |
1987 | old_phase = phase; | |
8ad3a593 | 1988 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1989 | } |
e3f463b0 FT |
1990 | #if defined(CONFIG_SUN3) |
1991 | if (phase == PHASE_CMDOUT) { | |
1992 | #if defined(REAL_DMA) | |
1993 | void *d; | |
1994 | unsigned long count; | |
1995 | ||
1996 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1997 | count = cmd->SCp.buffer->length; | |
1998 | d = sg_virt(cmd->SCp.buffer); | |
1999 | } else { | |
2000 | count = cmd->SCp.this_residual; | |
2001 | d = cmd->SCp.ptr; | |
2002 | } | |
2003 | /* this command setup for dma yet? */ | |
2004 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
2005 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
2006 | sun3scsi_dma_setup(d, count, | |
2007 | rq_data_dir(cmd->request)); | |
2008 | sun3_dma_setup_done = cmd; | |
2009 | } | |
2010 | } | |
2011 | #endif | |
2012 | #ifdef SUN3_SCSI_VME | |
2013 | dregs->csr |= CSR_INTR; | |
2014 | #endif | |
2015 | } | |
2016 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 2017 | |
c28bda25 RZ |
2018 | if (sink && (phase != PHASE_MSGOUT)) { |
2019 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
2020 | ||
2021 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
2022 | ICR_ASSERT_ACK); | |
2023 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
2024 | ; | |
2025 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2026 | ICR_ASSERT_ATN); | |
2027 | sink = 0; | |
2028 | continue; | |
2029 | } | |
2030 | ||
2031 | switch (phase) { | |
2032 | case PHASE_DATAOUT: | |
1da177e4 | 2033 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
2034 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
2035 | "aborted\n", HOSTNO); | |
2036 | sink = 1; | |
2037 | do_abort(instance); | |
2038 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2039 | cmd->scsi_done(cmd); |
c28bda25 | 2040 | return; |
1da177e4 | 2041 | #endif |
c28bda25 RZ |
2042 | case PHASE_DATAIN: |
2043 | /* | |
2044 | * If there is no room left in the current buffer in the | |
2045 | * scatter-gather list, move onto the next one. | |
2046 | */ | |
2047 | ||
2048 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2049 | ++cmd->SCp.buffer; | |
2050 | --cmd->SCp.buffers_residual; | |
2051 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 2052 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
2053 | /* ++roman: Try to merge some scatter-buffers if |
2054 | * they are at contiguous physical addresses. | |
2055 | */ | |
2056 | merge_contiguous_buffers(cmd); | |
d65e634a | 2057 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
2058 | HOSTNO, cmd->SCp.this_residual, |
2059 | cmd->SCp.buffers_residual); | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * The preferred transfer method is going to be | |
2064 | * PSEUDO-DMA for systems that are strictly PIO, | |
2065 | * since we can let the hardware do the handshaking. | |
2066 | * | |
2067 | * For this to work, we need to know the transfersize | |
2068 | * ahead of time, since the pseudo-DMA code will sit | |
2069 | * in an unconditional loop. | |
2070 | */ | |
2071 | ||
2072 | /* ++roman: I suggest, this should be | |
2073 | * #if def(REAL_DMA) | |
2074 | * instead of leaving REAL_DMA out. | |
2075 | */ | |
1da177e4 LT |
2076 | |
2077 | #if defined(REAL_DMA) | |
e3f463b0 | 2078 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
2079 | transfersize = 0; |
2080 | if (!cmd->device->borken) | |
e3f463b0 | 2081 | #endif |
ff3d4578 FT |
2082 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
2083 | ||
2084 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
2085 | len = transfersize; |
2086 | cmd->SCp.phase = phase; | |
2087 | if (NCR5380_transfer_dma(instance, &phase, | |
2088 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2089 | /* | |
2090 | * If the watchdog timer fires, all future | |
2091 | * accesses to this device will use the | |
2092 | * polled-IO. */ | |
ff50f9ed FT |
2093 | scmd_printk(KERN_INFO, cmd, |
2094 | "switching to slow handshake\n"); | |
c28bda25 | 2095 | cmd->device->borken = 1; |
c28bda25 RZ |
2096 | sink = 1; |
2097 | do_abort(instance); | |
2098 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2099 | cmd->scsi_done(cmd); |
c28bda25 RZ |
2100 | /* XXX - need to source or sink data here, as appropriate */ |
2101 | } else { | |
1da177e4 | 2102 | #ifdef REAL_DMA |
c28bda25 RZ |
2103 | /* ++roman: When using real DMA, |
2104 | * information_transfer() should return after | |
2105 | * starting DMA since it has nothing more to | |
2106 | * do. | |
2107 | */ | |
2108 | return; | |
2109 | #else | |
2110 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2111 | #endif |
c28bda25 RZ |
2112 | } |
2113 | } else | |
1da177e4 | 2114 | #endif /* defined(REAL_DMA) */ |
c28bda25 RZ |
2115 | NCR5380_transfer_pio(instance, &phase, |
2116 | (int *)&cmd->SCp.this_residual, | |
2117 | (unsigned char **)&cmd->SCp.ptr); | |
e3f463b0 FT |
2118 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2119 | /* if we had intended to dma that command clear it */ | |
2120 | if (sun3_dma_setup_done == cmd) | |
2121 | sun3_dma_setup_done = NULL; | |
2122 | #endif | |
c28bda25 RZ |
2123 | break; |
2124 | case PHASE_MSGIN: | |
2125 | len = 1; | |
2126 | data = &tmp; | |
2127 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2128 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2129 | cmd->SCp.Message = tmp; | |
2130 | ||
2131 | switch (tmp) { | |
c28bda25 RZ |
2132 | case ABORT: |
2133 | case COMMAND_COMPLETE: | |
2134 | /* Accept message by clearing ACK */ | |
2135 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2136 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2137 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
e3c3da67 FT |
2138 | |
2139 | local_irq_save(flags); | |
e3c3da67 | 2140 | hostdata->connected = NULL; |
1da177e4 | 2141 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2142 | cmd_free_tag(cmd); |
2143 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
61d739a4 | 2144 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 2145 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2146 | "QUEUE_FULL after %d commands\n", |
2147 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2148 | ta->nr_allocated); | |
2149 | if (ta->queue_size > ta->nr_allocated) | |
e42d0151 | 2150 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2151 | } |
1da177e4 | 2152 | #else |
c28bda25 | 2153 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2154 | #endif |
c28bda25 RZ |
2155 | /* Enable reselect interrupts */ |
2156 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2157 | ||
2158 | /* | |
2159 | * I'm not sure what the correct thing to do here is : | |
2160 | * | |
2161 | * If the command that just executed is NOT a request | |
2162 | * sense, the obvious thing to do is to set the result | |
2163 | * code to the values of the stored parameters. | |
2164 | * | |
2165 | * If it was a REQUEST SENSE command, we need some way to | |
2166 | * differentiate between the failure code of the original | |
2167 | * and the failure code of the REQUEST sense - the obvious | |
2168 | * case is success, where we fall through and leave the | |
2169 | * result code unchanged. | |
2170 | * | |
2171 | * The non-obvious place is where the REQUEST SENSE failed | |
2172 | */ | |
2173 | ||
2174 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2175 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2176 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2177 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2178 | |
28424d3a BH |
2179 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2180 | hostdata->ses.cmd_len) { | |
2181 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2182 | hostdata->ses.cmd_len = 0 ; | |
2183 | } | |
2184 | ||
c28bda25 RZ |
2185 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2186 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2187 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2188 | ||
d65e634a | 2189 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 | 2190 | |
c28bda25 | 2191 | LIST(cmd,hostdata->issue_queue); |
3130d905 | 2192 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2193 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
d65e634a | 2194 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
c28bda25 | 2195 | "issue queue\n", H_NO(cmd)); |
997acab7 | 2196 | } else { |
c28bda25 RZ |
2197 | cmd->scsi_done(cmd); |
2198 | } | |
2199 | ||
c28bda25 RZ |
2200 | /* |
2201 | * Restore phase bits to 0 so an interrupted selection, | |
2202 | * arbitration can resume. | |
2203 | */ | |
2204 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2205 | ||
72064a78 FT |
2206 | /* Enable reselect interrupts */ |
2207 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2208 | ||
c28bda25 RZ |
2209 | /* ++roman: For Falcon SCSI, release the lock on the |
2210 | * ST-DMA here if no other commands are waiting on the | |
2211 | * disconnected queue. | |
2212 | */ | |
e3c3da67 FT |
2213 | maybe_release_dma_irq(instance); |
2214 | local_irq_restore(flags); | |
c28bda25 RZ |
2215 | return; |
2216 | case MESSAGE_REJECT: | |
2217 | /* Accept message by clearing ACK */ | |
2218 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2219 | /* Enable reselect interrupts */ | |
2220 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2221 | switch (hostdata->last_message) { | |
2222 | case HEAD_OF_QUEUE_TAG: | |
2223 | case ORDERED_QUEUE_TAG: | |
2224 | case SIMPLE_QUEUE_TAG: | |
2225 | /* The target obviously doesn't support tagged | |
2226 | * queuing, even though it announced this ability in | |
2227 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2228 | * clear 'tagged_supported' and lock the LUN, since | |
2229 | * the command is treated as untagged further on. | |
2230 | */ | |
2231 | cmd->device->tagged_supported = 0; | |
2232 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2233 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2234 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2235 | "QUEUE_TAG message; tagged queuing " |
2236 | "disabled\n", | |
2237 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2238 | break; | |
2239 | } | |
2240 | break; | |
2241 | case DISCONNECT: | |
2242 | /* Accept message by clearing ACK */ | |
2243 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2244 | local_irq_save(flags); | |
c28bda25 | 2245 | LIST(cmd,hostdata->disconnected_queue); |
3130d905 | 2246 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2247 | hostdata->connected = NULL; |
2248 | hostdata->disconnected_queue = cmd; | |
2249 | local_irq_restore(flags); | |
9cb78c16 | 2250 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2251 | "moved from connected to the " |
2252 | "disconnected_queue\n", HOSTNO, | |
2253 | cmd->device->id, cmd->device->lun); | |
2254 | /* | |
2255 | * Restore phase bits to 0 so an interrupted selection, | |
2256 | * arbitration can resume. | |
2257 | */ | |
2258 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2259 | ||
2260 | /* Enable reselect interrupts */ | |
2261 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2262 | #ifdef SUN3_SCSI_VME |
2263 | dregs->csr |= CSR_DMA_ENABLE; | |
2264 | #endif | |
c28bda25 RZ |
2265 | return; |
2266 | /* | |
2267 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2268 | * operation, in violation of the SCSI spec so we can safely | |
2269 | * ignore SAVE/RESTORE pointers calls. | |
2270 | * | |
2271 | * Unfortunately, some disks violate the SCSI spec and | |
2272 | * don't issue the required SAVE_POINTERS message before | |
2273 | * disconnecting, and we have to break spec to remain | |
2274 | * compatible. | |
2275 | */ | |
2276 | case SAVE_POINTERS: | |
2277 | case RESTORE_POINTERS: | |
2278 | /* Accept message by clearing ACK */ | |
2279 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2280 | /* Enable reselect interrupts */ | |
2281 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2282 | break; | |
2283 | case EXTENDED_MESSAGE: | |
2284 | /* | |
2285 | * Extended messages are sent in the following format : | |
2286 | * Byte | |
2287 | * 0 EXTENDED_MESSAGE == 1 | |
2288 | * 1 length (includes one byte for code, doesn't | |
2289 | * include first two bytes) | |
2290 | * 2 code | |
2291 | * 3..length+1 arguments | |
2292 | * | |
2293 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2294 | * byte, since spi_print_msg() wants the whole thing. | |
2295 | */ | |
2296 | extended_msg[0] = EXTENDED_MESSAGE; | |
2297 | /* Accept first byte by clearing ACK */ | |
2298 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2299 | ||
d65e634a | 2300 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2301 | |
2302 | len = 2; | |
2303 | data = extended_msg + 1; | |
2304 | phase = PHASE_MSGIN; | |
2305 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2306 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2307 | (int)extended_msg[1], (int)extended_msg[2]); |
2308 | ||
e0783ed3 FT |
2309 | if (!len && extended_msg[1] > 0 && |
2310 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2311 | /* Accept third byte by clearing ACK */ |
2312 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2313 | len = extended_msg[1] - 1; | |
2314 | data = extended_msg + 3; | |
2315 | phase = PHASE_MSGIN; | |
2316 | ||
2317 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2318 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2319 | HOSTNO, len); |
2320 | ||
2321 | switch (extended_msg[2]) { | |
2322 | case EXTENDED_SDTR: | |
2323 | case EXTENDED_WDTR: | |
2324 | case EXTENDED_MODIFY_DATA_POINTER: | |
2325 | case EXTENDED_EXTENDED_IDENTIFY: | |
2326 | tmp = 0; | |
2327 | } | |
2328 | } else if (len) { | |
2329 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2330 | "extended message\n", HOSTNO); | |
2331 | tmp = 0; | |
2332 | } else { | |
2333 | printk(KERN_NOTICE "scsi%d: extended message " | |
2334 | "code %02x length %d is too long\n", | |
2335 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2336 | tmp = 0; | |
2337 | } | |
2338 | /* Fall through to reject message */ | |
2339 | ||
2340 | /* | |
2341 | * If we get something weird that we aren't expecting, | |
2342 | * reject it. | |
2343 | */ | |
2344 | default: | |
2345 | if (!tmp) { | |
ff50f9ed FT |
2346 | printk(KERN_INFO "scsi%d: rejecting message ", |
2347 | instance->host_no); | |
c28bda25 RZ |
2348 | spi_print_msg(extended_msg); |
2349 | printk("\n"); | |
2350 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2351 | scmd_printk(KERN_INFO, cmd, |
2352 | "rejecting unknown message %02x\n", | |
2353 | tmp); | |
c28bda25 | 2354 | else |
ff50f9ed FT |
2355 | scmd_printk(KERN_INFO, cmd, |
2356 | "rejecting unknown extended message code %02x, length %d\n", | |
2357 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2358 | |
2359 | msgout = MESSAGE_REJECT; | |
2360 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2361 | break; | |
2362 | } /* switch (tmp) */ | |
2363 | break; | |
2364 | case PHASE_MSGOUT: | |
2365 | len = 1; | |
2366 | data = &msgout; | |
2367 | hostdata->last_message = msgout; | |
2368 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2369 | if (msgout == ABORT) { | |
e3c3da67 | 2370 | local_irq_save(flags); |
1da177e4 | 2371 | #ifdef SUPPORT_TAGS |
c28bda25 | 2372 | cmd_free_tag(cmd); |
1da177e4 | 2373 | #else |
c28bda25 | 2374 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2375 | #endif |
c28bda25 RZ |
2376 | hostdata->connected = NULL; |
2377 | cmd->result = DID_ERROR << 16; | |
e3c3da67 FT |
2378 | maybe_release_dma_irq(instance); |
2379 | local_irq_restore(flags); | |
2380 | cmd->scsi_done(cmd); | |
cd400825 | 2381 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2382 | return; |
2383 | } | |
2384 | msgout = NOP; | |
2385 | break; | |
2386 | case PHASE_CMDOUT: | |
2387 | len = cmd->cmd_len; | |
2388 | data = cmd->cmnd; | |
2389 | /* | |
2390 | * XXX for performance reasons, on machines with a | |
2391 | * PSEUDO-DMA architecture we should probably | |
2392 | * use the dma transfer function. | |
2393 | */ | |
2394 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2395 | break; | |
2396 | case PHASE_STATIN: | |
2397 | len = 1; | |
2398 | data = &tmp; | |
2399 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2400 | cmd->SCp.Status = tmp; | |
2401 | break; | |
2402 | default: | |
2403 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2404 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2405 | } /* switch(phase) */ |
686f3990 FT |
2406 | } else { |
2407 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
2408 | } | |
c28bda25 | 2409 | } /* while (1) */ |
1da177e4 LT |
2410 | } |
2411 | ||
2412 | /* | |
2413 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2414 | * | |
c28bda25 | 2415 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2416 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2417 | * nexus has been reestablished, |
c28bda25 | 2418 | * |
1da177e4 LT |
2419 | * Inputs : instance - this instance of the NCR5380. |
2420 | * | |
2421 | */ | |
2422 | ||
2423 | ||
e3f463b0 FT |
2424 | /* it might eventually prove necessary to do a dma setup on |
2425 | reselection, but it doesn't seem to be needed now -- sam */ | |
2426 | ||
c28bda25 | 2427 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2428 | { |
c28bda25 RZ |
2429 | SETUP_HOSTDATA(instance); |
2430 | unsigned char target_mask; | |
e3f463b0 | 2431 | unsigned char lun; |
1da177e4 | 2432 | #ifdef SUPPORT_TAGS |
c28bda25 | 2433 | unsigned char tag; |
1da177e4 | 2434 | #endif |
c28bda25 | 2435 | unsigned char msg[3]; |
e3f463b0 FT |
2436 | int __maybe_unused len; |
2437 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2438 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2439 | |
2440 | /* | |
2441 | * Disable arbitration, etc. since the host adapter obviously | |
2442 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2443 | */ | |
2444 | ||
2445 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2446 | |
2447 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2448 | ||
d65e634a | 2449 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2450 | |
2451 | /* | |
2452 | * At this point, we have detected that our SCSI ID is on the bus, | |
2453 | * SEL is true and BSY was false for at least one bus settle delay | |
2454 | * (400 ns). | |
2455 | * | |
2456 | * We must assert BSY ourselves, until the target drops the SEL | |
2457 | * signal. | |
2458 | */ | |
2459 | ||
2460 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2461 | if (NCR5380_poll_politely(instance, |
2462 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2463 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2464 | return; | |
2465 | } | |
c28bda25 RZ |
2466 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2467 | ||
2468 | /* | |
2469 | * Wait for target to go into MSGIN. | |
2470 | */ | |
2471 | ||
72064a78 FT |
2472 | if (NCR5380_poll_politely(instance, |
2473 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2474 | do_abort(instance); | |
2475 | return; | |
2476 | } | |
c28bda25 | 2477 | |
e3f463b0 FT |
2478 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2479 | /* acknowledge toggle to MSGIN */ | |
2480 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2481 | ||
2482 | /* peek at the byte without really hitting the bus */ | |
2483 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2484 | #else | |
c28bda25 RZ |
2485 | len = 1; |
2486 | data = msg; | |
2487 | phase = PHASE_MSGIN; | |
2488 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2489 | |
2490 | if (len) { | |
2491 | do_abort(instance); | |
2492 | return; | |
2493 | } | |
e3f463b0 | 2494 | #endif |
c28bda25 RZ |
2495 | |
2496 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2497 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2498 | spi_print_msg(msg); |
72064a78 | 2499 | printk("\n"); |
c28bda25 RZ |
2500 | do_abort(instance); |
2501 | return; | |
2502 | } | |
72064a78 | 2503 | lun = msg[0] & 0x07; |
1da177e4 | 2504 | |
e3f463b0 | 2505 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2506 | /* If the phase is still MSGIN, the target wants to send some more |
2507 | * messages. In case it supports tagged queuing, this is probably a | |
2508 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2509 | */ | |
2510 | tag = TAG_NONE; | |
ca513fc9 | 2511 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2512 | /* Accept previous IDENTIFY message by clearing ACK */ |
2513 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2514 | len = 2; | |
2515 | data = msg + 1; | |
2516 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2517 | msg[1] == SIMPLE_QUEUE_TAG) | |
2518 | tag = msg[2]; | |
d65e634a | 2519 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2520 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2521 | } | |
1da177e4 | 2522 | #endif |
c28bda25 RZ |
2523 | |
2524 | /* | |
2525 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2526 | * just reestablished, and remove it from the disconnected queue. | |
2527 | */ | |
2528 | ||
710ddd0d | 2529 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 | 2530 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
72064a78 | 2531 | if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) |
1da177e4 | 2532 | #ifdef SUPPORT_TAGS |
c28bda25 | 2533 | && (tag == tmp->tag) |
1da177e4 | 2534 | #endif |
c28bda25 | 2535 | ) { |
c28bda25 RZ |
2536 | if (prev) { |
2537 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2538 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2539 | } else { |
2540 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2541 | hostdata->disconnected_queue = NEXT(tmp); | |
2542 | } | |
3130d905 | 2543 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2544 | break; |
2545 | } | |
1da177e4 | 2546 | } |
c28bda25 RZ |
2547 | |
2548 | if (!tmp) { | |
1da177e4 | 2549 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2550 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2551 | target_mask, lun, tag); | |
2552 | #else | |
2553 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2554 | target_mask, lun); | |
1da177e4 | 2555 | #endif |
c28bda25 RZ |
2556 | /* |
2557 | * Since we have an established nexus that we can't do anything | |
2558 | * with, we must abort it. | |
2559 | */ | |
2560 | do_abort(instance); | |
2561 | return; | |
2562 | } | |
1da177e4 | 2563 | |
e3f463b0 FT |
2564 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2565 | /* engage dma setup for the command we just saw */ | |
2566 | { | |
2567 | void *d; | |
2568 | unsigned long count; | |
2569 | ||
2570 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2571 | count = tmp->SCp.buffer->length; | |
2572 | d = sg_virt(tmp->SCp.buffer); | |
2573 | } else { | |
2574 | count = tmp->SCp.this_residual; | |
2575 | d = tmp->SCp.ptr; | |
2576 | } | |
2577 | /* setup this command for dma if not already */ | |
2578 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2579 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2580 | sun3_dma_setup_done = tmp; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2585 | #endif | |
2586 | ||
c28bda25 RZ |
2587 | /* Accept message by clearing ACK */ |
2588 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2589 | |
e3f463b0 FT |
2590 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2591 | /* If the phase is still MSGIN, the target wants to send some more | |
2592 | * messages. In case it supports tagged queuing, this is probably a | |
2593 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2594 | */ | |
2595 | tag = TAG_NONE; | |
2596 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2597 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2598 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2599 | len = 2; | |
2600 | data = msg + 1; | |
2601 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2602 | msg[1] == SIMPLE_QUEUE_TAG) | |
2603 | tag = msg[2]; | |
2604 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2605 | HOSTNO, target_mask, lun, tag); | |
2606 | } | |
2607 | #endif | |
2608 | ||
c28bda25 | 2609 | hostdata->connected = tmp; |
9cb78c16 | 2610 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2611 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2612 | } |
2613 | ||
2614 | ||
2615 | /* | |
710ddd0d | 2616 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2617 | * |
2618 | * Purpose : abort a command | |
2619 | * | |
710ddd0d | 2620 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2621 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2622 | * used. |
2623 | * | |
b6c92b7e | 2624 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2625 | * |
c28bda25 RZ |
2626 | * XXX - there is no way to abort the command that is currently |
2627 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2628 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2629 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2630 | */ |
2631 | ||
2632 | static | |
710ddd0d | 2633 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2634 | { |
c28bda25 RZ |
2635 | struct Scsi_Host *instance = cmd->device->host; |
2636 | SETUP_HOSTDATA(instance); | |
710ddd0d | 2637 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2638 | unsigned long flags; |
1da177e4 | 2639 | |
1fa6b5fb | 2640 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2641 | |
c28bda25 RZ |
2642 | NCR5380_print_status(instance); |
2643 | ||
2644 | local_irq_save(flags); | |
1da177e4 | 2645 | |
d65e634a | 2646 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2647 | NCR5380_read(BUS_AND_STATUS_REG), |
2648 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2649 | |
2650 | #if 1 | |
c28bda25 RZ |
2651 | /* |
2652 | * Case 1 : If the command is the currently executing command, | |
2653 | * we'll set the aborted flag and return control so that | |
2654 | * information transfer routine can exit cleanly. | |
2655 | */ | |
1da177e4 | 2656 | |
c28bda25 | 2657 | if (hostdata->connected == cmd) { |
1da177e4 | 2658 | |
d65e634a | 2659 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2660 | /* |
2661 | * We should perform BSY checking, and make sure we haven't slipped | |
2662 | * into BUS FREE. | |
2663 | */ | |
1da177e4 | 2664 | |
c28bda25 RZ |
2665 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2666 | /* | |
2667 | * Since we can't change phases until we've completed the current | |
2668 | * handshake, we have to source or sink a byte of data if the current | |
2669 | * phase is not MSGOUT. | |
2670 | */ | |
1da177e4 | 2671 | |
c28bda25 RZ |
2672 | /* |
2673 | * Return control to the executing NCR drive so we can clear the | |
2674 | * aborted flag and get back into our main loop. | |
2675 | */ | |
1da177e4 | 2676 | |
c28bda25 | 2677 | if (do_abort(instance) == 0) { |
c28bda25 RZ |
2678 | hostdata->connected = NULL; |
2679 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2680 | #ifdef SUPPORT_TAGS |
c28bda25 | 2681 | cmd_free_tag(cmd); |
1da177e4 | 2682 | #else |
c28bda25 | 2683 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2684 | #endif |
e3c3da67 | 2685 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2686 | local_irq_restore(flags); |
2687 | cmd->scsi_done(cmd); | |
2b0f834c | 2688 | return SUCCESS; |
c28bda25 | 2689 | } else { |
e3c3da67 | 2690 | local_irq_restore(flags); |
c28bda25 | 2691 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2692 | return FAILED; |
c28bda25 RZ |
2693 | } |
2694 | } | |
1da177e4 LT |
2695 | #endif |
2696 | ||
c28bda25 RZ |
2697 | /* |
2698 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2699 | * from the issue queue. | |
2700 | */ | |
710ddd0d FT |
2701 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2702 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2703 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2704 | if (cmd == tmp) { | |
2705 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2706 | (*prev) = NEXT(tmp); | |
3130d905 | 2707 | SET_NEXT(tmp, NULL); |
c28bda25 | 2708 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2709 | maybe_release_dma_irq(instance); |
c28bda25 | 2710 | local_irq_restore(flags); |
d65e634a | 2711 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2712 | HOSTNO); |
2713 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2714 | * yet... */ | |
2715 | tmp->scsi_done(tmp); | |
2b0f834c | 2716 | return SUCCESS; |
c28bda25 | 2717 | } |
1da177e4 LT |
2718 | } |
2719 | ||
c28bda25 RZ |
2720 | /* |
2721 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2722 | * and let the high level SCSI driver retry at a later time or | |
2723 | * issue a reset. | |
2724 | * | |
2725 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2726 | * and handling them cleanly in this situation would make the common | |
2727 | * case of noresets less efficient, and would pollute our code. So, | |
2728 | * we fail. | |
2729 | */ | |
1da177e4 | 2730 | |
c28bda25 RZ |
2731 | if (hostdata->connected) { |
2732 | local_irq_restore(flags); | |
d65e634a | 2733 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2734 | return FAILED; |
c28bda25 | 2735 | } |
1da177e4 | 2736 | |
c28bda25 RZ |
2737 | /* |
2738 | * Case 4: If the command is currently disconnected from the bus, and | |
2739 | * there are no connected commands, we reconnect the I_T_L or | |
2740 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2741 | * an abort message. | |
2742 | * | |
2743 | * This case is especially ugly. In order to reestablish the nexus, we | |
2744 | * need to call NCR5380_select(). The easiest way to implement this | |
2745 | * function was to abort if the bus was busy, and let the interrupt | |
2746 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2747 | * where necessary, meaning interrupts need to be enabled. | |
2748 | * | |
2749 | * When interrupts are enabled, the queues may change - so we | |
2750 | * can't remove it from the disconnected queue before selecting it | |
2751 | * because that could cause a failure in hashing the nexus if that | |
2752 | * device reselected. | |
2753 | * | |
2754 | * Since the queues may change, we can't use the pointers from when we | |
2755 | * first locate it. | |
2756 | * | |
2757 | * So, we must first locate the command, and if NCR5380_select() | |
2758 | * succeeds, then issue the abort, relocate the command and remove | |
2759 | * it from the disconnected queue. | |
2760 | */ | |
2761 | ||
710ddd0d | 2762 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2763 | tmp = NEXT(tmp)) { |
2764 | if (cmd == tmp) { | |
2765 | local_irq_restore(flags); | |
d65e634a | 2766 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2767 | |
76f13b93 | 2768 | if (NCR5380_select(instance, cmd)) |
2b0f834c | 2769 | return FAILED; |
1da177e4 | 2770 | |
d65e634a | 2771 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2772 | |
2773 | do_abort(instance); | |
2774 | ||
2775 | local_irq_save(flags); | |
710ddd0d FT |
2776 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2777 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2778 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2779 | if (cmd == tmp) { | |
2780 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2781 | *prev = NEXT(tmp); | |
3130d905 | 2782 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2783 | tmp->result = DID_ABORT << 16; |
2784 | /* We must unlock the tag/LUN immediately here, since the | |
2785 | * target goes to BUS FREE and doesn't send us another | |
2786 | * message (COMMAND_COMPLETE or the like) | |
2787 | */ | |
1da177e4 | 2788 | #ifdef SUPPORT_TAGS |
c28bda25 | 2789 | cmd_free_tag(tmp); |
1da177e4 | 2790 | #else |
c28bda25 | 2791 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2792 | #endif |
e3c3da67 | 2793 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2794 | local_irq_restore(flags); |
2795 | tmp->scsi_done(tmp); | |
2b0f834c | 2796 | return SUCCESS; |
c28bda25 RZ |
2797 | } |
2798 | } | |
1da177e4 LT |
2799 | } |
2800 | } | |
2801 | ||
e3c3da67 FT |
2802 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2803 | * possible at all) At least, we should check if the lock could be | |
2804 | * released after the abort, in case it is kept due to some bug. | |
2805 | */ | |
2806 | maybe_release_dma_irq(instance); | |
2807 | local_irq_restore(flags); | |
2808 | ||
c28bda25 RZ |
2809 | /* |
2810 | * Case 5 : If we reached this point, the command was not found in any of | |
2811 | * the queues. | |
2812 | * | |
2813 | * We probably reached this point because of an unlikely race condition | |
2814 | * between the command completing successfully and the abortion code, | |
2815 | * so we won't panic, but we will notify the user in case something really | |
2816 | * broke. | |
2817 | */ | |
1da177e4 | 2818 | |
ad361c98 | 2819 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2820 | |
2b0f834c | 2821 | return FAILED; |
1da177e4 LT |
2822 | } |
2823 | ||
2824 | ||
3be1b3ea FT |
2825 | /** |
2826 | * NCR5380_bus_reset - reset the SCSI bus | |
2827 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2828 | * |
3be1b3ea | 2829 | * Returns SUCCESS |
c28bda25 | 2830 | */ |
1da177e4 | 2831 | |
710ddd0d | 2832 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2833 | { |
e3c3da67 FT |
2834 | struct Scsi_Host *instance = cmd->device->host; |
2835 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2836 | int i; |
2837 | unsigned long flags; | |
1da177e4 | 2838 | |
3be1b3ea FT |
2839 | local_irq_save(flags); |
2840 | ||
2841 | #if (NDEBUG & NDEBUG_ANY) | |
2842 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
e3c3da67 | 2843 | NCR5380_print_status(instance); |
3be1b3ea FT |
2844 | #endif |
2845 | ||
2846 | do_reset(instance); | |
c28bda25 | 2847 | |
c28bda25 | 2848 | /* reset NCR registers */ |
c28bda25 RZ |
2849 | NCR5380_write(MODE_REG, MR_BASE); |
2850 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2851 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2852 | |
c28bda25 RZ |
2853 | /* After the reset, there are no more connected or disconnected commands |
2854 | * and no busy units; so clear the low-level status here to avoid | |
2855 | * conflicts when the mid-level code tries to wake up the affected | |
2856 | * commands! | |
2857 | */ | |
2858 | ||
2859 | if (hostdata->issue_queue) | |
d65e634a | 2860 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
c28bda25 | 2861 | if (hostdata->connected) |
d65e634a | 2862 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 | 2863 | if (hostdata->disconnected_queue) |
d65e634a | 2864 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
c28bda25 | 2865 | |
c28bda25 RZ |
2866 | hostdata->issue_queue = NULL; |
2867 | hostdata->connected = NULL; | |
2868 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2869 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2870 | free_all_tags(hostdata); |
1da177e4 | 2871 | #endif |
c28bda25 RZ |
2872 | for (i = 0; i < 8; ++i) |
2873 | hostdata->busy[i] = 0; | |
1da177e4 | 2874 | #ifdef REAL_DMA |
c28bda25 | 2875 | hostdata->dma_len = 0; |
1da177e4 | 2876 | #endif |
e3c3da67 FT |
2877 | |
2878 | maybe_release_dma_irq(instance); | |
c28bda25 | 2879 | local_irq_restore(flags); |
1da177e4 | 2880 | |
2b0f834c | 2881 | return SUCCESS; |
1da177e4 | 2882 | } |