Commit | Line | Data |
---|---|---|
c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * For more information, please consult |
1da177e4 LT |
15 | * |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
28 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
29 | * this file, too: | |
30 | * | |
31 | * - Some of the debug statements were incorrect (undefined variables and the | |
32 | * like). I fixed that. | |
33 | * | |
34 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
35 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
36 | * in the #if statement. | |
37 | * | |
38 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
39 | * phase after starting the DMA. It has nothing more to do. | |
40 | * | |
41 | * - The interrupt service routine should run main after end of DMA, too (not | |
42 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
43 | * for more interrupts after running main, since a DMA process may have | |
44 | * been started and interrupts are turned on now. The new int could happen | |
45 | * inside the execution of NCR5380_intr(), leading to recursive | |
46 | * calls. | |
47 | * | |
48 | * - I've added a function merge_contiguous_buffers() that tries to | |
49 | * merge scatter-gather buffers that are located at contiguous | |
50 | * physical addresses and can be processed with the same DMA setup. | |
51 | * Since most scatter-gather operations work on a page (4K) of | |
52 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
53 | * DMA setup actions are saved. | |
54 | * | |
55 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
56 | * and USLEEP, because these were messing up readability and will never be | |
57 | * needed for Atari SCSI. | |
c28bda25 | 58 | * |
1da177e4 LT |
59 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
60 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
61 | * interrupt. | |
62 | * | |
63 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
64 | * constructs. In my eyes, this made the source rather unreadable, so I | |
65 | * finally replaced that by the *_PRINTK() macros. | |
66 | * | |
67 | */ | |
68 | ||
e3f463b0 FT |
69 | /* Adapted for the sun3 by Sam Creasey. */ |
70 | ||
1da177e4 LT |
71 | /* |
72 | * Design | |
1da177e4 | 73 | * |
c28bda25 | 74 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 75 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 76 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
77 | * memory mapped) and drops this file in their 'C' wrapper. |
78 | * | |
c28bda25 | 79 | * As far as command queueing, two queues are maintained for |
1da177e4 | 80 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
81 | * and commands that are currently executing. This means that an |
82 | * unlimited number of commands may be queued, letting | |
83 | * more commands propagate from the higher driver levels giving higher | |
84 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
85 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
86 | * while a command is already executing. |
87 | * | |
1da177e4 | 88 | * |
c28bda25 | 89 | * Issues specific to the NCR5380 : |
1da177e4 | 90 | * |
c28bda25 RZ |
91 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
92 | * piece of hardware that requires you to sit in a loop polling for | |
93 | * the REQ signal as long as you are connected. Some devices are | |
94 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 95 | * while doing long seek operations. [...] These |
1da177e4 LT |
96 | * broken devices are the exception rather than the rule and I'd rather |
97 | * spend my time optimizing for the normal case. | |
98 | * | |
99 | * Architecture : | |
100 | * | |
101 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
102 | * which is started from a workqueue for each NCR5380 host in the |
103 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
104 | * removing the commands from the issue queue and calling | |
105 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
106 | * |
107 | * Once a nexus is established, the NCR5380_information_transfer() | |
108 | * phase goes through the various phases as instructed by the target. | |
109 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
110 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
111 | * queue, and NCR5380_main tries to find more work. If the target is |
112 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
113 | * |
114 | * If a command has disconnected, eventually an interrupt will trigger, | |
115 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
116 | * to reestablish a nexus. This will run main if necessary. | |
117 | * | |
c28bda25 | 118 | * On command termination, the done function will be called as |
1da177e4 LT |
119 | * appropriate. |
120 | * | |
c28bda25 | 121 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
122 | * structures, being initialized after the command is connected |
123 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
124 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
125 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
126 | */ | |
127 | ||
128 | /* | |
129 | * Using this file : | |
130 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 131 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
132 | * and macros and include this file in your driver. |
133 | * | |
c28bda25 | 134 | * These macros control options : |
1da177e4 | 135 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 136 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 137 | * |
ff50f9ed FT |
138 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
139 | * transceivers. | |
140 | * | |
1da177e4 LT |
141 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
142 | * | |
143 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
144 | * | |
145 | * These macros MUST be defined : | |
c28bda25 | 146 | * |
1da177e4 LT |
147 | * NCR5380_read(register) - read from the specified register |
148 | * | |
c28bda25 | 149 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 150 | * |
ff50f9ed FT |
151 | * NCR5380_implementation_fields - additional fields needed for this |
152 | * specific implementation of the NCR5380 | |
153 | * | |
1da177e4 | 154 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 155 | * REAL functions : |
1da177e4 | 156 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 157 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
158 | * that they were able to program the controller for. |
159 | * | |
c28bda25 | 160 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
161 | * available as NCR5380_i386_dma_write_setup, |
162 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
163 | * | |
164 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
165 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
166 | * NCR5380_dma_residual(instance); - residual count | |
167 | * | |
168 | * PSEUDO functions : | |
169 | * NCR5380_pwrite(instance, src, count) | |
170 | * NCR5380_pread(instance, dst, count); | |
171 | * | |
1da177e4 | 172 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 173 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 174 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 175 | * possible) function may be used. |
1da177e4 LT |
176 | */ |
177 | ||
1da177e4 | 178 | #define HOSTNO instance->host_no |
1da177e4 | 179 | |
636b1ec8 FT |
180 | static int do_abort(struct Scsi_Host *); |
181 | static void do_reset(struct Scsi_Host *); | |
182 | ||
1da177e4 LT |
183 | #ifdef SUPPORT_TAGS |
184 | ||
185 | /* | |
186 | * Functions for handling tagged queuing | |
187 | * ===================================== | |
188 | * | |
189 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
190 | * | |
191 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
192 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
193 | * command has been preempted for a long time. My solution: a bitfield for | |
194 | * remembering used tags. | |
195 | * | |
196 | * There's also the problem that each target has a certain queue size, but we | |
197 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
198 | * returned. So, in this case, the driver internal queue size assumption is | |
199 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 200 | * target. |
1da177e4 LT |
201 | * |
202 | * We're also not allowed running tagged commands as long as an untagged | |
203 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
204 | * condition _must_ be untagged. To keep track whether an untagged command has | |
205 | * been issued, the host->busy array is still employed, as it is without | |
206 | * support for tagged queuing. | |
207 | * | |
208 | * One could suspect that there are possible race conditions between | |
209 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
210 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
211 | * which already guaranteed to be running at most once. It is also the only | |
212 | * place where tags/LUNs are allocated. So no other allocation can slip | |
213 | * between that pair, there could only happen a reselection, which can free a | |
214 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
215 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
216 | */ | |
217 | ||
ca513fc9 | 218 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 219 | { |
c28bda25 | 220 | int target, lun; |
61d739a4 | 221 | struct tag_alloc *ta; |
c28bda25 | 222 | |
ca513fc9 | 223 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
224 | return; |
225 | ||
226 | for (target = 0; target < 8; ++target) { | |
227 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 228 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
229 | bitmap_zero(ta->allocated, MAX_TAGS); |
230 | ta->nr_allocated = 0; | |
231 | /* At the beginning, assume the maximum queue size we could | |
232 | * support (MAX_TAGS). This value will be decreased if the target | |
233 | * returns QUEUE_FULL status. | |
234 | */ | |
235 | ta->queue_size = MAX_TAGS; | |
236 | } | |
1da177e4 | 237 | } |
1da177e4 LT |
238 | } |
239 | ||
240 | ||
241 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
242 | * busy by an untagged command. If the command should use tagged queuing, also | |
243 | * check that there is a free tag and the target's queue won't overflow. This | |
244 | * function should be called with interrupts disabled to avoid race | |
245 | * conditions. | |
c28bda25 | 246 | */ |
1da177e4 | 247 | |
710ddd0d | 248 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 249 | { |
9cb78c16 | 250 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
251 | struct Scsi_Host *instance = cmd->device->host; |
252 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 253 | |
9cb78c16 | 254 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
255 | return 1; |
256 | if (!should_be_tagged || | |
ca513fc9 FT |
257 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
258 | !cmd->device->tagged_supported) | |
c28bda25 | 259 | return 0; |
61d739a4 FT |
260 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
261 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
262 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
263 | scmd_id(cmd), lun); | |
c28bda25 RZ |
264 | return 1; |
265 | } | |
266 | return 0; | |
1da177e4 LT |
267 | } |
268 | ||
269 | ||
270 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
271 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
272 | * untagged. | |
273 | */ | |
274 | ||
710ddd0d | 275 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 276 | { |
9cb78c16 | 277 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
278 | struct Scsi_Host *instance = cmd->device->host; |
279 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
280 | |
281 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
282 | * an untagged command. | |
283 | */ | |
284 | if (!should_be_tagged || | |
ca513fc9 FT |
285 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
286 | !cmd->device->tagged_supported) { | |
c28bda25 | 287 | cmd->tag = TAG_NONE; |
9cb78c16 | 288 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
289 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
290 | scmd_id(cmd), lun); | |
c28bda25 | 291 | } else { |
61d739a4 | 292 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
293 | |
294 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
295 | set_bit(cmd->tag, ta->allocated); | |
296 | ta->nr_allocated++; | |
dbb6b350 FT |
297 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
298 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 299 | } |
1da177e4 LT |
300 | } |
301 | ||
302 | ||
303 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
304 | * unlock the LUN. | |
305 | */ | |
306 | ||
710ddd0d | 307 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 308 | { |
9cb78c16 | 309 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
310 | struct Scsi_Host *instance = cmd->device->host; |
311 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
312 | |
313 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 314 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
315 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
316 | scmd_id(cmd), lun); | |
c28bda25 | 317 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
318 | shost_printk(KERN_NOTICE, instance, |
319 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 320 | } else { |
61d739a4 | 321 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
322 | clear_bit(cmd->tag, ta->allocated); |
323 | ta->nr_allocated--; | |
dbb6b350 FT |
324 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
325 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 326 | } |
1da177e4 LT |
327 | } |
328 | ||
329 | ||
ca513fc9 | 330 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 331 | { |
c28bda25 | 332 | int target, lun; |
61d739a4 | 333 | struct tag_alloc *ta; |
c28bda25 | 334 | |
ca513fc9 | 335 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
336 | return; |
337 | ||
338 | for (target = 0; target < 8; ++target) { | |
339 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 340 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
341 | bitmap_zero(ta->allocated, MAX_TAGS); |
342 | ta->nr_allocated = 0; | |
343 | } | |
1da177e4 | 344 | } |
1da177e4 LT |
345 | } |
346 | ||
347 | #endif /* SUPPORT_TAGS */ | |
348 | ||
349 | ||
350 | /* | |
710ddd0d | 351 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
352 | * |
353 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
354 | * transfer. This is possible if the scatter buffers lie on | |
355 | * physical contiguous addresses. | |
356 | * | |
710ddd0d | 357 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 358 | * The command to work on. The first scatter buffer's data are |
25985edc | 359 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
360 | */ |
361 | ||
710ddd0d | 362 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 363 | { |
e3f463b0 | 364 | #if !defined(CONFIG_SUN3) |
c28bda25 | 365 | unsigned long endaddr; |
1da177e4 | 366 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
367 | unsigned long oldlen = cmd->SCp.this_residual; |
368 | int cnt = 1; | |
1da177e4 LT |
369 | #endif |
370 | ||
c28bda25 RZ |
371 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
372 | cmd->SCp.buffers_residual && | |
5a1cb47f | 373 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 374 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 375 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 376 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 377 | ++cnt; |
1da177e4 | 378 | #endif |
c28bda25 RZ |
379 | ++cmd->SCp.buffer; |
380 | --cmd->SCp.buffers_residual; | |
381 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
382 | endaddr += cmd->SCp.buffer->length; | |
383 | } | |
1da177e4 | 384 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 385 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 386 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 387 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 388 | #endif |
e3f463b0 | 389 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
390 | } |
391 | ||
ff50f9ed FT |
392 | /** |
393 | * initialize_SCp - init the scsi pointer field | |
394 | * @cmd: command block to set up | |
1da177e4 | 395 | * |
ff50f9ed | 396 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
397 | */ |
398 | ||
710ddd0d | 399 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 400 | { |
c28bda25 RZ |
401 | /* |
402 | * Initialize the Scsi Pointer field so that all of the commands in the | |
403 | * various queues are valid. | |
1da177e4 | 404 | */ |
c28bda25 | 405 | |
9e0fe44d BH |
406 | if (scsi_bufflen(cmd)) { |
407 | cmd->SCp.buffer = scsi_sglist(cmd); | |
408 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 409 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
410 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
411 | /* ++roman: Try to merge some scatter-buffers if they are at | |
412 | * contiguous physical addresses. | |
413 | */ | |
414 | merge_contiguous_buffers(cmd); | |
415 | } else { | |
416 | cmd->SCp.buffer = NULL; | |
417 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
418 | cmd->SCp.ptr = NULL; |
419 | cmd->SCp.this_residual = 0; | |
c28bda25 | 420 | } |
1da177e4 LT |
421 | } |
422 | ||
636b1ec8 | 423 | /** |
b32ade12 | 424 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 425 | * @instance: controller to poll |
b32ade12 FT |
426 | * @reg1: 5380 register to poll |
427 | * @bit1: Bitmask to check | |
428 | * @val1: Expected value | |
429 | * @reg2: Second 5380 register to poll | |
430 | * @bit2: Second bitmask to check | |
431 | * @val2: Second expected value | |
2f854b82 | 432 | * @wait: Time-out in jiffies |
636b1ec8 | 433 | * |
2f854b82 FT |
434 | * Polls the chip in a reasonably efficient manner waiting for an |
435 | * event to occur. After a short quick poll we begin to yield the CPU | |
436 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
437 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 438 | * |
b32ade12 | 439 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
440 | */ |
441 | ||
b32ade12 FT |
442 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
443 | int reg1, int bit1, int val1, | |
444 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 445 | { |
2f854b82 FT |
446 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
447 | unsigned long deadline = jiffies + wait; | |
448 | unsigned long n; | |
449 | ||
450 | /* Busy-wait for up to 10 ms */ | |
451 | n = min(10000U, jiffies_to_usecs(wait)); | |
452 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 453 | n /= 2000; |
2f854b82 | 454 | do { |
b32ade12 FT |
455 | if ((NCR5380_read(reg1) & bit1) == val1) |
456 | return 0; | |
457 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
458 | return 0; |
459 | cpu_relax(); | |
2f854b82 FT |
460 | } while (n--); |
461 | ||
462 | if (irqs_disabled() || in_interrupt()) | |
463 | return -ETIMEDOUT; | |
636b1ec8 | 464 | |
2f854b82 FT |
465 | /* Repeatedly sleep for 1 ms until deadline */ |
466 | while (time_is_after_jiffies(deadline)) { | |
467 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
468 | if ((NCR5380_read(reg1) & bit1) == val1) |
469 | return 0; | |
470 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 471 | return 0; |
636b1ec8 | 472 | } |
2f854b82 | 473 | |
636b1ec8 FT |
474 | return -ETIMEDOUT; |
475 | } | |
476 | ||
b32ade12 FT |
477 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
478 | int reg, int bit, int val, int wait) | |
479 | { | |
480 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
481 | reg, bit, val, wait); | |
482 | } | |
483 | ||
1da177e4 LT |
484 | #if NDEBUG |
485 | static struct { | |
c28bda25 RZ |
486 | unsigned char mask; |
487 | const char *name; | |
488 | } signals[] = { | |
489 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
490 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
491 | { SR_SEL, "SEL" }, {0, NULL} | |
492 | }, basrs[] = { | |
493 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
494 | }, icrs[] = { | |
495 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
496 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
497 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
498 | {0, NULL} | |
499 | }, mrs[] = { | |
500 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
501 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
502 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
503 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
504 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
505 | {0, NULL} | |
506 | }; | |
1da177e4 | 507 | |
ff50f9ed FT |
508 | /** |
509 | * NCR5380_print - print scsi bus signals | |
510 | * @instance: adapter state to dump | |
1da177e4 | 511 | * |
ff50f9ed | 512 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
513 | */ |
514 | ||
c28bda25 RZ |
515 | static void NCR5380_print(struct Scsi_Host *instance) |
516 | { | |
517 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 518 | |
c28bda25 RZ |
519 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
520 | status = NCR5380_read(STATUS_REG); | |
521 | mr = NCR5380_read(MODE_REG); | |
522 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
523 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 524 | |
c28bda25 RZ |
525 | printk("STATUS_REG: %02x ", status); |
526 | for (i = 0; signals[i].mask; ++i) | |
527 | if (status & signals[i].mask) | |
528 | printk(",%s", signals[i].name); | |
529 | printk("\nBASR: %02x ", basr); | |
530 | for (i = 0; basrs[i].mask; ++i) | |
531 | if (basr & basrs[i].mask) | |
532 | printk(",%s", basrs[i].name); | |
533 | printk("\nICR: %02x ", icr); | |
534 | for (i = 0; icrs[i].mask; ++i) | |
535 | if (icr & icrs[i].mask) | |
536 | printk(",%s", icrs[i].name); | |
537 | printk("\nMODE: %02x ", mr); | |
538 | for (i = 0; mrs[i].mask; ++i) | |
539 | if (mr & mrs[i].mask) | |
540 | printk(",%s", mrs[i].name); | |
541 | printk("\n"); | |
1da177e4 LT |
542 | } |
543 | ||
544 | static struct { | |
c28bda25 RZ |
545 | unsigned char value; |
546 | const char *name; | |
1da177e4 | 547 | } phases[] = { |
c28bda25 RZ |
548 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
549 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
550 | {PHASE_UNKNOWN, "UNKNOWN"} | |
551 | }; | |
1da177e4 | 552 | |
ff50f9ed FT |
553 | /** |
554 | * NCR5380_print_phase - show SCSI phase | |
555 | * @instance: adapter to dump | |
1da177e4 | 556 | * |
ff50f9ed | 557 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 558 | * |
ff50f9ed | 559 | * Locks: none |
1da177e4 LT |
560 | */ |
561 | ||
562 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
563 | { | |
c28bda25 RZ |
564 | unsigned char status; |
565 | int i; | |
566 | ||
567 | status = NCR5380_read(STATUS_REG); | |
568 | if (!(status & SR_REQ)) | |
569 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
570 | else { | |
571 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
572 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
573 | ; | |
574 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
575 | } | |
1da177e4 LT |
576 | } |
577 | ||
1da177e4 LT |
578 | #endif |
579 | ||
8c32513b FT |
580 | /** |
581 | * NCR58380_info - report driver and host information | |
582 | * @instance: relevant scsi host instance | |
1da177e4 | 583 | * |
8c32513b | 584 | * For use as the host template info() handler. |
1da177e4 | 585 | * |
8c32513b | 586 | * Locks: none |
1da177e4 LT |
587 | */ |
588 | ||
8c32513b | 589 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 590 | { |
8c32513b FT |
591 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
592 | ||
593 | return hostdata->info; | |
594 | } | |
595 | ||
596 | static void prepare_info(struct Scsi_Host *instance) | |
597 | { | |
598 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
599 | ||
600 | snprintf(hostdata->info, sizeof(hostdata->info), | |
601 | "%s, io_port 0x%lx, n_io_port %d, " | |
602 | "base 0x%lx, irq %d, " | |
603 | "can_queue %d, cmd_per_lun %d, " | |
604 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 605 | "flags { %s%s}, " |
8c32513b FT |
606 | "options { %s} ", |
607 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
608 | instance->base, instance->irq, | |
609 | instance->can_queue, instance->cmd_per_lun, | |
610 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 611 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 612 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
613 | #ifdef DIFFERENTIAL |
614 | "DIFFERENTIAL " | |
615 | #endif | |
1da177e4 | 616 | #ifdef REAL_DMA |
8c32513b | 617 | "REAL_DMA " |
1da177e4 LT |
618 | #endif |
619 | #ifdef PARITY | |
8c32513b | 620 | "PARITY " |
1da177e4 LT |
621 | #endif |
622 | #ifdef SUPPORT_TAGS | |
8c32513b | 623 | "SUPPORT_TAGS " |
1da177e4 | 624 | #endif |
8c32513b | 625 | ""); |
1da177e4 LT |
626 | } |
627 | ||
ff50f9ed FT |
628 | /** |
629 | * NCR5380_init - initialise an NCR5380 | |
630 | * @instance: adapter to configure | |
631 | * @flags: control flags | |
1da177e4 | 632 | * |
ff50f9ed FT |
633 | * Initializes *instance and corresponding 5380 chip, |
634 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
635 | * |
636 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 637 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 638 | * |
ff50f9ed | 639 | * Returns 0 for success |
1da177e4 LT |
640 | */ |
641 | ||
95fde7a8 | 642 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 643 | { |
e8a60144 | 644 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 645 | int i; |
2f854b82 | 646 | unsigned long deadline; |
c28bda25 | 647 | |
a53a21e4 | 648 | hostdata->host = instance; |
c28bda25 RZ |
649 | hostdata->id_mask = 1 << instance->this_id; |
650 | hostdata->id_higher_mask = 0; | |
651 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
652 | if (i > hostdata->id_mask) | |
653 | hostdata->id_higher_mask |= i; | |
654 | for (i = 0; i < 8; ++i) | |
655 | hostdata->busy[i] = 0; | |
1da177e4 | 656 | #ifdef SUPPORT_TAGS |
ca513fc9 | 657 | init_tags(hostdata); |
1da177e4 LT |
658 | #endif |
659 | #if defined (REAL_DMA) | |
c28bda25 | 660 | hostdata->dma_len = 0; |
1da177e4 | 661 | #endif |
11d2f63b | 662 | spin_lock_init(&hostdata->lock); |
c28bda25 | 663 | hostdata->connected = NULL; |
32b26a10 FT |
664 | INIT_LIST_HEAD(&hostdata->unissued); |
665 | INIT_LIST_HEAD(&hostdata->disconnected); | |
666 | ||
ef1081cb | 667 | hostdata->flags = flags; |
c28bda25 | 668 | |
a53a21e4 | 669 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
670 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
671 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
672 | 1, instance->host_no); | |
673 | if (!hostdata->work_q) | |
674 | return -ENOMEM; | |
1da177e4 | 675 | |
8c32513b FT |
676 | prepare_info(instance); |
677 | ||
c28bda25 RZ |
678 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
679 | NCR5380_write(MODE_REG, MR_BASE); | |
680 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
681 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 682 | |
2f854b82 FT |
683 | /* Calibrate register polling loop */ |
684 | i = 0; | |
685 | deadline = jiffies + 1; | |
686 | do { | |
687 | cpu_relax(); | |
688 | } while (time_is_after_jiffies(deadline)); | |
689 | deadline += msecs_to_jiffies(256); | |
690 | do { | |
691 | NCR5380_read(STATUS_REG); | |
692 | ++i; | |
693 | cpu_relax(); | |
694 | } while (time_is_after_jiffies(deadline)); | |
695 | hostdata->accesses_per_ms = i / 256; | |
696 | ||
c28bda25 | 697 | return 0; |
1da177e4 LT |
698 | } |
699 | ||
636b1ec8 FT |
700 | /** |
701 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
702 | * @instance: adapter to check | |
703 | * | |
704 | * If the system crashed, it may have crashed with a connected target and | |
705 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
706 | * currently established nexus, which we know nothing about. Failing that | |
707 | * do a bus reset. | |
708 | * | |
709 | * Note that a bus reset will cause the chip to assert IRQ. | |
710 | * | |
711 | * Returns 0 if successful, otherwise -ENXIO. | |
712 | */ | |
713 | ||
714 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
715 | { | |
9c3f0e2b | 716 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
717 | int pass; |
718 | ||
719 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
720 | switch (pass) { | |
721 | case 1: | |
722 | case 3: | |
723 | case 5: | |
724 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
725 | NCR5380_poll_politely(instance, | |
726 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
727 | break; | |
728 | case 2: | |
729 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
730 | do_abort(instance); | |
731 | break; | |
732 | case 4: | |
733 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
734 | do_reset(instance); | |
9c3f0e2b FT |
735 | /* Wait after a reset; the SCSI standard calls for |
736 | * 250ms, we wait 500ms to be on the safe side. | |
737 | * But some Toshiba CD-ROMs need ten times that. | |
738 | */ | |
739 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
740 | msleep(2500); | |
741 | else | |
742 | msleep(500); | |
636b1ec8 FT |
743 | break; |
744 | case 6: | |
745 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
746 | return -ENXIO; | |
747 | } | |
748 | } | |
749 | return 0; | |
750 | } | |
751 | ||
ff50f9ed FT |
752 | /** |
753 | * NCR5380_exit - remove an NCR5380 | |
754 | * @instance: adapter to remove | |
755 | * | |
756 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
757 | */ | |
758 | ||
6323e4fe GU |
759 | static void NCR5380_exit(struct Scsi_Host *instance) |
760 | { | |
a53a21e4 FT |
761 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
762 | ||
763 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 764 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
765 | } |
766 | ||
ff50f9ed FT |
767 | /** |
768 | * NCR5380_queue_command - queue a command | |
769 | * @instance: the relevant SCSI adapter | |
770 | * @cmd: SCSI command | |
1da177e4 | 771 | * |
1bb40589 | 772 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
773 | * twiddling done to the host specific fields of cmd. If the |
774 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
775 | */ |
776 | ||
16b29e75 FT |
777 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
778 | struct scsi_cmnd *cmd) | |
1da177e4 | 779 | { |
16b29e75 | 780 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
32b26a10 | 781 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
c28bda25 | 782 | unsigned long flags; |
1da177e4 LT |
783 | |
784 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
785 | switch (cmd->cmnd[0]) { |
786 | case WRITE_6: | |
787 | case WRITE_10: | |
dbb6b350 | 788 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 789 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 790 | cmd->scsi_done(cmd); |
c28bda25 RZ |
791 | return 0; |
792 | } | |
1da177e4 LT |
793 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
794 | ||
c28bda25 RZ |
795 | cmd->result = 0; |
796 | ||
797 | /* | |
798 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
799 | * commands are added to the head of the queue since any command will | |
800 | * clear the contingent allegiance condition that exists and the | |
801 | * sense data is only guaranteed to be valid while the condition exists. | |
802 | */ | |
803 | ||
c28bda25 RZ |
804 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
805 | * Otherwise a running NCR5380_main may steal the lock. | |
806 | * Lock before actually inserting due to fairness reasons explained in | |
807 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
808 | * to release the lock. | |
809 | * Stop timer for this command while waiting for the lock, or timeouts | |
810 | * may happen (and they really do), and it's no good if the command doesn't | |
811 | * appear in any of the queues. | |
812 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
813 | * because also a timer int can trigger an abort or reset, which would | |
814 | * alter queues and touch the lock. | |
815 | */ | |
e3c3da67 | 816 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
817 | return SCSI_MLQUEUE_HOST_BUSY; |
818 | ||
11d2f63b | 819 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 820 | |
ff50f9ed FT |
821 | /* |
822 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
823 | * commands are added to the head of the queue since any command will | |
824 | * clear the contingent allegiance condition that exists and the | |
825 | * sense data is only guaranteed to be valid while the condition exists. | |
826 | */ | |
827 | ||
32b26a10 FT |
828 | if (cmd->cmnd[0] == REQUEST_SENSE) |
829 | list_add(&ncmd->list, &hostdata->unissued); | |
830 | else | |
831 | list_add_tail(&ncmd->list, &hostdata->unissued); | |
832 | ||
11d2f63b | 833 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 834 | |
dbb6b350 FT |
835 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
836 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 837 | |
010e89d1 FT |
838 | /* Kick off command processing */ |
839 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 840 | return 0; |
1da177e4 LT |
841 | } |
842 | ||
e3c3da67 FT |
843 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
844 | { | |
845 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
846 | ||
847 | /* Caller does the locking needed to set & test these data atomically */ | |
32b26a10 FT |
848 | if (list_empty(&hostdata->disconnected) && |
849 | list_empty(&hostdata->unissued) && | |
e3c3da67 FT |
850 | !hostdata->connected && |
851 | !hostdata->retain_dma_intr) | |
852 | NCR5380_release_dma_irq(instance); | |
853 | } | |
854 | ||
ff50f9ed FT |
855 | /** |
856 | * NCR5380_main - NCR state machines | |
1da177e4 | 857 | * |
ff50f9ed FT |
858 | * NCR5380_main is a coroutine that runs as long as more work can |
859 | * be done on the NCR5380 host adapters in a system. Both | |
860 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
861 | * in case it is not running. | |
c28bda25 | 862 | * |
ff50f9ed | 863 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
864 | */ |
865 | ||
b312b38c | 866 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 867 | { |
a53a21e4 FT |
868 | struct NCR5380_hostdata *hostdata = |
869 | container_of(work, struct NCR5380_hostdata, main_task); | |
870 | struct Scsi_Host *instance = hostdata->host; | |
32b26a10 | 871 | struct NCR5380_cmd *ncmd, *n; |
c28bda25 | 872 | int done; |
c28bda25 RZ |
873 | |
874 | /* | |
c28bda25 RZ |
875 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
876 | * because also a timer int can trigger an abort or reset, which can | |
877 | * alter queues and touch the Falcon lock. | |
878 | */ | |
879 | ||
11d2f63b | 880 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 881 | do { |
c28bda25 RZ |
882 | done = 1; |
883 | ||
884 | if (!hostdata->connected) { | |
d65e634a | 885 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
886 | /* |
887 | * Search through the issue_queue for a command destined | |
888 | * for a target that's not busy. | |
889 | */ | |
32b26a10 FT |
890 | list_for_each_entry_safe(ncmd, n, &hostdata->unissued, |
891 | list) { | |
892 | struct scsi_cmnd *tmp = NCR5380_to_scmd(ncmd); | |
9cb78c16 | 893 | u8 lun = tmp->device->lun; |
1da177e4 | 894 | |
0d3d9a42 FT |
895 | dsprintk(NDEBUG_QUEUES, instance, "main: tmp=%p target=%d busy=%d lun=%d\n", |
896 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], lun); | |
c28bda25 | 897 | /* When we find one, remove it from the issue queue. */ |
c28bda25 | 898 | if ( |
1da177e4 | 899 | #ifdef SUPPORT_TAGS |
c28bda25 | 900 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 901 | #else |
9cb78c16 | 902 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 903 | #endif |
c28bda25 | 904 | ) { |
32b26a10 | 905 | list_del(&ncmd->list); |
0d3d9a42 | 906 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, |
32b26a10 FT |
907 | instance, "main: removed %p from issue queue\n", |
908 | tmp); | |
0d3d9a42 | 909 | |
ef1081cb | 910 | hostdata->retain_dma_intr++; |
c28bda25 | 911 | |
c28bda25 RZ |
912 | /* |
913 | * Attempt to establish an I_T_L nexus here. | |
914 | * On success, instance->hostdata->connected is set. | |
915 | * On failure, we must add the command back to the | |
916 | * issue queue so we can keep trying. | |
917 | */ | |
c28bda25 RZ |
918 | /* |
919 | * REQUEST SENSE commands are issued without tagged | |
920 | * queueing, even on SCSI-II devices because the | |
921 | * contingent allegiance condition exists for the | |
922 | * entire unit. | |
923 | */ | |
924 | /* ++roman: ...and the standard also requires that | |
925 | * REQUEST SENSE command are untagged. | |
926 | */ | |
927 | ||
1da177e4 | 928 | #ifdef SUPPORT_TAGS |
c28bda25 | 929 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 930 | #endif |
76f13b93 | 931 | if (!NCR5380_select(instance, tmp)) { |
1f1b0c74 | 932 | /* OK or bad target */ |
ef1081cb | 933 | hostdata->retain_dma_intr--; |
e3c3da67 | 934 | maybe_release_dma_irq(instance); |
c28bda25 | 935 | } else { |
1f1b0c74 | 936 | /* Need to retry */ |
32b26a10 | 937 | list_add(&ncmd->list, &hostdata->unissued); |
0d3d9a42 FT |
938 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, |
939 | instance, "main: select() failed, %p returned to issue queue\n", | |
940 | tmp); | |
1da177e4 | 941 | #ifdef SUPPORT_TAGS |
c28bda25 | 942 | cmd_free_tag(tmp); |
1da177e4 | 943 | #endif |
ef1081cb | 944 | hostdata->retain_dma_intr--; |
1d3db59d | 945 | done = 0; |
c28bda25 | 946 | } |
1f1b0c74 FT |
947 | if (hostdata->connected) |
948 | break; | |
c28bda25 RZ |
949 | } /* if target/lun/target queue is not busy */ |
950 | } /* for issue_queue */ | |
951 | } /* if (!hostdata->connected) */ | |
952 | ||
953 | if (hostdata->connected | |
1da177e4 | 954 | #ifdef REAL_DMA |
c28bda25 | 955 | && !hostdata->dma_len |
1da177e4 | 956 | #endif |
c28bda25 | 957 | ) { |
d65e634a | 958 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
959 | HOSTNO); |
960 | NCR5380_information_transfer(instance); | |
d65e634a | 961 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
962 | done = 0; |
963 | } | |
964 | } while (!done); | |
11d2f63b | 965 | spin_unlock_irq(&hostdata->lock); |
1da177e4 LT |
966 | } |
967 | ||
968 | ||
969 | #ifdef REAL_DMA | |
970 | /* | |
971 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
972 | * | |
973 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 974 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
975 | * |
976 | * Inputs : instance - this instance of the NCR5380. | |
977 | * | |
978 | */ | |
979 | ||
c28bda25 | 980 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 981 | { |
e8a60144 | 982 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
01bd9081 | 983 | int transferred; |
e3f463b0 | 984 | unsigned char **data; |
5299b3ca | 985 | int *count; |
e3f463b0 FT |
986 | int saved_data = 0, overrun = 0; |
987 | unsigned char p; | |
c28bda25 | 988 | |
ef1081cb | 989 | if (hostdata->read_overruns) { |
c28bda25 RZ |
990 | p = hostdata->connected->SCp.phase; |
991 | if (p & SR_IO) { | |
992 | udelay(10); | |
993 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
994 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
995 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
996 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
997 | overrun = 1; | |
d65e634a | 998 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
999 | } |
1000 | } | |
1001 | } | |
1002 | ||
e3f463b0 FT |
1003 | #if defined(CONFIG_SUN3) |
1004 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1005 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1006 | instance->host_no); | |
1007 | BUG(); | |
1008 | } | |
1009 | ||
1010 | /* make sure we're not stuck in a data phase */ | |
1011 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1012 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1013 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1014 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1015 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1016 | instance->host_no); | |
1017 | BUG(); | |
1018 | } | |
1019 | #endif | |
1020 | ||
c28bda25 RZ |
1021 | NCR5380_write(MODE_REG, MR_BASE); |
1022 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1023 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1024 | |
01bd9081 | 1025 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1026 | hostdata->dma_len = 0; |
1027 | ||
1028 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1029 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1030 | *data += transferred; |
1031 | *count -= transferred; | |
c28bda25 | 1032 | |
ef1081cb | 1033 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1034 | int cnt, toPIO; |
1035 | ||
c28bda25 | 1036 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1037 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1038 | if (overrun) { |
d65e634a | 1039 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1040 | *(*data)++ = saved_data; |
1041 | (*count)--; | |
1042 | cnt--; | |
1043 | toPIO--; | |
1044 | } | |
d65e634a | 1045 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1046 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1047 | *count -= toPIO - cnt; | |
1048 | } | |
1da177e4 | 1049 | } |
1da177e4 LT |
1050 | } |
1051 | #endif /* REAL_DMA */ | |
1052 | ||
1053 | ||
ff50f9ed FT |
1054 | /** |
1055 | * NCR5380_intr - generic NCR5380 irq handler | |
1056 | * @irq: interrupt number | |
1057 | * @dev_id: device info | |
1da177e4 | 1058 | * |
ff50f9ed FT |
1059 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1060 | * from the disconnected queue, and restarting NCR5380_main() | |
1061 | * as required. | |
cd400825 FT |
1062 | * |
1063 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1064 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1065 | * Three of these six conditions are latched in the Bus and Status Register: | |
1066 | * - End of DMA (cleared by ending DMA Mode) | |
1067 | * - Parity error (cleared by reading RPIR) | |
1068 | * - Loss of BSY (cleared by reading RPIR) | |
1069 | * Two conditions have flag bits that are not latched: | |
1070 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1071 | * - Bus reset (non-maskable) | |
1072 | * The remaining condition has no flag bit at all: | |
1073 | * - Selection/reselection | |
1074 | * | |
1075 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1076 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1077 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1078 | * interrupts will not be lost (they can be on the DP5380)." | |
1079 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1080 | * | |
1081 | * Checking for bus reset by reading RST is futile because of interrupt | |
1082 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1083 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1084 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1085 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1086 | */ |
1087 | ||
c28bda25 | 1088 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1089 | { |
a53a21e4 | 1090 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1091 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1092 | int handled = 0; |
c28bda25 | 1093 | unsigned char basr; |
11d2f63b FT |
1094 | unsigned long flags; |
1095 | ||
1096 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1097 | |
c28bda25 | 1098 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1099 | if (basr & BASR_IRQ) { |
cd400825 FT |
1100 | unsigned char mr = NCR5380_read(MODE_REG); |
1101 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1102 | ||
1103 | dprintk(NDEBUG_INTR, "scsi%d: IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", | |
1104 | HOSTNO, irq, basr, sr, mr); | |
1da177e4 LT |
1105 | |
1106 | #if defined(REAL_DMA) | |
cd400825 FT |
1107 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1108 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1109 | * We ack IRQ after clearing Mode Register. Workarounds | |
1110 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1111 | */ |
1112 | ||
cd400825 | 1113 | dprintk(NDEBUG_INTR, "scsi%d: interrupt in DMA mode\n", HOSTNO); |
c28bda25 | 1114 | |
cd400825 FT |
1115 | if (hostdata->connected) { |
1116 | NCR5380_dma_complete(instance); | |
1117 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1118 | } else { | |
1119 | NCR5380_write(MODE_REG, MR_BASE); | |
1120 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1121 | } | |
1122 | } else | |
1da177e4 | 1123 | #endif /* REAL_DMA */ |
cd400825 FT |
1124 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1125 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1126 | /* Probably reselected */ | |
1127 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1128 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1129 | ||
1130 | dprintk(NDEBUG_INTR, "scsi%d: interrupt with SEL and IO\n", | |
1131 | HOSTNO); | |
1132 | ||
1133 | if (!hostdata->connected) { | |
1134 | NCR5380_reselect(instance); | |
1135 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1136 | } | |
1137 | if (!hostdata->connected) | |
1138 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1139 | } else { | |
1140 | /* Probably Bus Reset */ | |
1141 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1142 | ||
1143 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt\n", HOSTNO); | |
e3f463b0 | 1144 | #ifdef SUN3_SCSI_VME |
cd400825 | 1145 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1146 | #endif |
cd400825 | 1147 | } |
c28bda25 | 1148 | handled = 1; |
cd400825 FT |
1149 | } else { |
1150 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1151 | #ifdef SUN3_SCSI_VME |
1152 | dregs->csr |= CSR_DMA_ENABLE; | |
1153 | #endif | |
c28bda25 RZ |
1154 | } |
1155 | ||
11d2f63b FT |
1156 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1157 | ||
c28bda25 | 1158 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1159 | } |
1160 | ||
c28bda25 | 1161 | /* |
710ddd0d FT |
1162 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1163 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1164 | * |
1165 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1166 | * including ARBITRATION, SELECTION, and initial message out for |
1167 | * IDENTIFY and queue messages. | |
1da177e4 | 1168 | * |
c28bda25 | 1169 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1170 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1171 | * |
6323876f FT |
1172 | * Returns : -1 if selection failed but should be retried. |
1173 | * 0 if selection failed and should not be retried. | |
1174 | * 0 if selection succeeded completely (hostdata->connected == cmd). | |
1da177e4 | 1175 | * |
c28bda25 RZ |
1176 | * Side effects : |
1177 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1178 | * with registers as they should have been on entry - ie |
1179 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1180 | * will cease to drive any SCSI bus signals. | |
1181 | * | |
c28bda25 RZ |
1182 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1183 | * instance->connected will be set to cmd. | |
1184 | * SELECT interrupt will be disabled. | |
1da177e4 | 1185 | * |
c28bda25 | 1186 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1187 | * cmd->result host byte set to DID_BAD_TARGET. |
1188 | */ | |
1189 | ||
710ddd0d | 1190 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1191 | { |
e8a60144 | 1192 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1193 | unsigned char tmp[3], phase; |
1194 | unsigned char *data; | |
1195 | int len; | |
ae753a33 | 1196 | int err; |
c28bda25 | 1197 | |
8ad3a593 | 1198 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1199 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1200 | instance->this_id); |
1201 | ||
1202 | /* | |
1203 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1204 | * data bus during SELECTION. | |
1205 | */ | |
1206 | ||
c28bda25 | 1207 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1208 | |
c28bda25 RZ |
1209 | /* |
1210 | * Start arbitration. | |
1211 | */ | |
1da177e4 | 1212 | |
c28bda25 RZ |
1213 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1214 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1215 | |
55500d9b FT |
1216 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1217 | * Bus Free Delay, arbitration will begin. | |
1218 | */ | |
c28bda25 | 1219 | |
11d2f63b | 1220 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1221 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1222 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1223 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1224 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1225 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1226 | /* Reselection interrupt */ | |
1227 | return -1; | |
1228 | } | |
1229 | if (err < 0) { | |
1230 | NCR5380_write(MODE_REG, MR_BASE); | |
1231 | shost_printk(KERN_ERR, instance, | |
1232 | "select: arbitration timeout\n"); | |
1233 | return -1; | |
c28bda25 | 1234 | } |
11d2f63b | 1235 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1236 | |
55500d9b | 1237 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1238 | udelay(3); |
1239 | ||
1240 | /* Check for lost arbitration */ | |
1241 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1242 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1243 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1244 | NCR5380_write(MODE_REG, MR_BASE); |
d65e634a | 1245 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 | 1246 | HOSTNO); |
11d2f63b | 1247 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1248 | return -1; |
1249 | } | |
1da177e4 | 1250 | |
cf13b083 FT |
1251 | /* After/during arbitration, BSY should be asserted. |
1252 | * IBM DPES-31080 Version S31Q works now | |
1253 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1254 | */ | |
c28bda25 RZ |
1255 | NCR5380_write(INITIATOR_COMMAND_REG, |
1256 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1257 | ||
c28bda25 RZ |
1258 | /* |
1259 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1260 | * a minimum so we'll udelay ceil(1.2) | |
1261 | */ | |
1da177e4 | 1262 | |
9c3f0e2b FT |
1263 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1264 | udelay(15); | |
1265 | else | |
1266 | udelay(2); | |
c28bda25 | 1267 | |
11d2f63b FT |
1268 | spin_lock_irq(&hostdata->lock); |
1269 | ||
72064a78 FT |
1270 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1271 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
c28bda25 | 1272 | return -1; |
c28bda25 | 1273 | |
d65e634a | 1274 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1275 | |
1276 | /* | |
1277 | * Now that we have won arbitration, start Selection process, asserting | |
1278 | * the host and target ID's on the SCSI bus. | |
1279 | */ | |
1280 | ||
1281 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1282 | ||
1283 | /* | |
1284 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1285 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1286 | * phase immediately after selection. | |
1287 | */ | |
1288 | ||
1289 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1290 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1291 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1292 | |
c28bda25 RZ |
1293 | /* |
1294 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1295 | * otherwise we will trigger an interrupt. | |
1296 | */ | |
c28bda25 | 1297 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1298 | |
11d2f63b FT |
1299 | spin_unlock_irq(&hostdata->lock); |
1300 | ||
c28bda25 RZ |
1301 | /* |
1302 | * The initiator shall then wait at least two deskew delays and release | |
1303 | * the BSY signal. | |
1304 | */ | |
1305 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1306 | ||
1307 | /* Reset BSY */ | |
1308 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1309 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1310 | ||
1311 | /* | |
1312 | * Something weird happens when we cease to drive BSY - looks | |
1313 | * like the board/chip is letting us do another read before the | |
1314 | * appropriate propagation delay has expired, and we're confusing | |
1315 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1316 | * | |
1317 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1318 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1319 | * tighter 'C' code breaks and requires this) solves the problem - | |
1320 | * the 1 us delay is arbitrary, and only used because this delay will | |
1321 | * be the same on other platforms and since it works here, it should | |
1322 | * work there. | |
1323 | * | |
1324 | * wingel suggests that this could be due to failing to wait | |
1325 | * one deskew delay. | |
1326 | */ | |
1da177e4 | 1327 | |
c28bda25 | 1328 | udelay(1); |
1da177e4 | 1329 | |
d65e634a | 1330 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1331 | |
c28bda25 RZ |
1332 | /* |
1333 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1334 | * selection. | |
1335 | */ | |
1da177e4 | 1336 | |
ae753a33 FT |
1337 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1338 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1339 | |
1340 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1341 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1342 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1343 | NCR5380_reselect(instance); | |
cd400825 FT |
1344 | if (!hostdata->connected) |
1345 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
c28bda25 RZ |
1346 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", |
1347 | HOSTNO); | |
c28bda25 RZ |
1348 | return -1; |
1349 | } | |
1da177e4 | 1350 | |
ae753a33 | 1351 | if (err < 0) { |
11d2f63b | 1352 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1353 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1354 | cmd->result = DID_BAD_TARGET << 16; |
1da177e4 | 1355 | #ifdef SUPPORT_TAGS |
c28bda25 | 1356 | cmd_free_tag(cmd); |
1da177e4 | 1357 | #endif |
c28bda25 RZ |
1358 | cmd->scsi_done(cmd); |
1359 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1360 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1361 | return 0; |
1362 | } | |
1363 | ||
ae753a33 FT |
1364 | /* |
1365 | * No less than two deskew delays after the initiator detects the | |
1366 | * BSY signal is true, it shall release the SEL signal and may | |
1367 | * change the DATA BUS. -wingel | |
1368 | */ | |
1369 | ||
1370 | udelay(1); | |
1371 | ||
1372 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1373 | ||
c28bda25 RZ |
1374 | /* |
1375 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1376 | * was true but before BSY was false during selection, the information | |
1377 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1378 | * IDENTIFY message. | |
1379 | * | |
1380 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1381 | * message (2 bytes) with a tag ID that we increment with every command | |
1382 | * until it wraps back to 0. | |
1383 | * | |
1384 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1385 | * which claim to support tagged queuing but fail when more than | |
1386 | * some number of commands are issued at once. | |
1387 | */ | |
1388 | ||
1389 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1390 | |
1391 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1392 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1393 | if (err < 0) { |
1394 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1395 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1396 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1397 | return -1; | |
1398 | } | |
c28bda25 | 1399 | |
d65e634a | 1400 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1401 | HOSTNO, cmd->device->id); |
1402 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1403 | |
1404 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1405 | if (cmd->tag != TAG_NONE) { |
1406 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1407 | tmp[2] = cmd->tag; | |
1408 | len = 3; | |
1409 | } else | |
1410 | len = 1; | |
1da177e4 | 1411 | #else |
c28bda25 RZ |
1412 | len = 1; |
1413 | cmd->tag = 0; | |
1da177e4 LT |
1414 | #endif /* SUPPORT_TAGS */ |
1415 | ||
c28bda25 RZ |
1416 | /* Send message(s) */ |
1417 | data = tmp; | |
1418 | phase = PHASE_MSGOUT; | |
1419 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1420 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 | 1421 | /* XXX need to handle errors here */ |
11d2f63b | 1422 | |
c28bda25 | 1423 | hostdata->connected = cmd; |
1da177e4 | 1424 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1425 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1426 | #endif | |
e3f463b0 FT |
1427 | #ifdef SUN3_SCSI_VME |
1428 | dregs->csr |= CSR_INTR; | |
1429 | #endif | |
1da177e4 | 1430 | |
c28bda25 | 1431 | initialize_SCp(cmd); |
1da177e4 | 1432 | |
c28bda25 | 1433 | return 0; |
1da177e4 LT |
1434 | } |
1435 | ||
c28bda25 RZ |
1436 | /* |
1437 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1438 | * unsigned char *phase, int *count, unsigned char **data) |
1439 | * | |
1440 | * Purpose : transfers data in given phase using polled I/O | |
1441 | * | |
c28bda25 RZ |
1442 | * Inputs : instance - instance of driver, *phase - pointer to |
1443 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1444 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1445 | * |
1da177e4 | 1446 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1447 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1448 | * is in same phase. |
1449 | * | |
c28bda25 | 1450 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1451 | * |
1452 | * XXX Note : handling for bus free may be useful. | |
1453 | */ | |
1454 | ||
1455 | /* | |
c28bda25 | 1456 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1457 | * IS 100% reliable, and for the actual data transfer where speed |
1458 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1459 | */ | |
1460 | ||
c28bda25 RZ |
1461 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1462 | unsigned char *phase, int *count, | |
1463 | unsigned char **data) | |
1da177e4 | 1464 | { |
c28bda25 RZ |
1465 | register unsigned char p = *phase, tmp; |
1466 | register int c = *count; | |
1467 | register unsigned char *d = *data; | |
1468 | ||
1469 | /* | |
1470 | * The NCR5380 chip will only drive the SCSI bus when the | |
1471 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1472 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1473 | */ |
1da177e4 | 1474 | |
c28bda25 | 1475 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1476 | |
c28bda25 RZ |
1477 | do { |
1478 | /* | |
1479 | * Wait for assertion of REQ, after which the phase bits will be | |
1480 | * valid | |
1481 | */ | |
686f3990 FT |
1482 | |
1483 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1484 | break; | |
1da177e4 | 1485 | |
d65e634a | 1486 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1487 | |
c28bda25 | 1488 | /* Check for phase mismatch */ |
686f3990 | 1489 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
d65e634a | 1490 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1491 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1492 | break; |
1493 | } | |
1da177e4 | 1494 | |
c28bda25 RZ |
1495 | /* Do actual transfer from SCSI bus to / from memory */ |
1496 | if (!(p & SR_IO)) | |
1497 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1498 | else | |
1499 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1500 | |
c28bda25 | 1501 | ++d; |
1da177e4 | 1502 | |
c28bda25 RZ |
1503 | /* |
1504 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1505 | * should drop ATN on the last byte of the message phase | |
1506 | * after REQ has been asserted for the handshake but before | |
1507 | * the initiator raises ACK. | |
1508 | */ | |
1da177e4 | 1509 | |
c28bda25 RZ |
1510 | if (!(p & SR_IO)) { |
1511 | if (!((p & SR_MSG) && c > 1)) { | |
1512 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1513 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1514 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1515 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1516 | } else { | |
1517 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1518 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1519 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1520 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1521 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1522 | } | |
1523 | } else { | |
8ad3a593 | 1524 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1525 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1526 | } | |
1da177e4 | 1527 | |
a2edc4a6 FT |
1528 | if (NCR5380_poll_politely(instance, |
1529 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1530 | break; | |
c28bda25 | 1531 | |
d65e634a | 1532 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1533 | |
1534 | /* | |
1535 | * We have several special cases to consider during REQ/ACK handshaking : | |
1536 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1537 | * message. ATN must be dropped as ACK is dropped. | |
1538 | * | |
1539 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1540 | * message. We must exit with ACK asserted, so that the calling | |
1541 | * code may raise ATN before dropping ACK to reject the message. | |
1542 | * | |
1543 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1544 | */ | |
1545 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1546 | if (p == PHASE_MSGOUT && c > 1) | |
1547 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1548 | else | |
1549 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1550 | } | |
1551 | } while (--c); | |
1552 | ||
d65e634a | 1553 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1554 | |
1555 | *count = c; | |
1556 | *data = d; | |
1557 | tmp = NCR5380_read(STATUS_REG); | |
1558 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1559 | * asserted or if ACK hasn't been released yet. The latter applies if |
1560 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1561 | */ |
a2edc4a6 | 1562 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1563 | *phase = tmp & PHASE_MASK; |
1564 | else | |
1565 | *phase = PHASE_UNKNOWN; | |
1566 | ||
1567 | if (!c || (*phase == p)) | |
1568 | return 0; | |
1569 | else | |
1570 | return -1; | |
1da177e4 LT |
1571 | } |
1572 | ||
636b1ec8 FT |
1573 | /** |
1574 | * do_reset - issue a reset command | |
1575 | * @instance: adapter to reset | |
1576 | * | |
1577 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1578 | * back into sane shape. | |
1579 | * | |
1580 | * This clears the reset interrupt flag because there may be no handler for | |
1581 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1582 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1583 | */ | |
1584 | ||
1585 | static void do_reset(struct Scsi_Host *instance) | |
1586 | { | |
1587 | unsigned long flags; | |
1588 | ||
1589 | local_irq_save(flags); | |
1590 | NCR5380_write(TARGET_COMMAND_REG, | |
1591 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1592 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1593 | udelay(50); | |
1594 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1595 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1596 | local_irq_restore(flags); | |
1597 | } | |
1598 | ||
80d3eb6d FT |
1599 | /** |
1600 | * do_abort - abort the currently established nexus by going to | |
1601 | * MESSAGE OUT phase and sending an ABORT message. | |
1602 | * @instance: relevant scsi host instance | |
c28bda25 | 1603 | * |
80d3eb6d | 1604 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1605 | */ |
1606 | ||
a53a21e4 | 1607 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1608 | { |
c28bda25 RZ |
1609 | unsigned char tmp, *msgptr, phase; |
1610 | int len; | |
80d3eb6d | 1611 | int rc; |
c28bda25 RZ |
1612 | |
1613 | /* Request message out phase */ | |
1da177e4 | 1614 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1615 | |
1616 | /* | |
1617 | * Wait for the target to indicate a valid phase by asserting | |
1618 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1619 | * and can immediately send the ABORT message, or we'll have some | |
1620 | * other phase and will have to source/sink data. | |
1621 | * | |
1622 | * We really don't care what value was on the bus or what value | |
1623 | * the target sees, so we just handshake. | |
1624 | */ | |
1625 | ||
80d3eb6d FT |
1626 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1627 | if (rc < 0) | |
1628 | goto timeout; | |
1629 | ||
1630 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1631 | |
1632 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1633 | ||
80d3eb6d FT |
1634 | if (tmp != PHASE_MSGOUT) { |
1635 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1636 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1637 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1638 | if (rc < 0) | |
1639 | goto timeout; | |
c28bda25 RZ |
1640 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1641 | } | |
1642 | ||
1643 | tmp = ABORT; | |
1644 | msgptr = &tmp; | |
1645 | len = 1; | |
1646 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1647 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1648 | |
1649 | /* | |
1650 | * If we got here, and the command completed successfully, | |
1651 | * we're about to go into bus free state. | |
1652 | */ | |
1653 | ||
1654 | return len ? -1 : 0; | |
80d3eb6d FT |
1655 | |
1656 | timeout: | |
1657 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1658 | return -1; | |
1da177e4 LT |
1659 | } |
1660 | ||
1661 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1662 | /* |
1663 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1664 | * unsigned char *phase, int *count, unsigned char **data) |
1665 | * | |
1666 | * Purpose : transfers data in given phase using either real | |
1667 | * or pseudo DMA. | |
1668 | * | |
c28bda25 RZ |
1669 | * Inputs : instance - instance of driver, *phase - pointer to |
1670 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1671 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1672 | * |
1da177e4 | 1673 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1674 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1675 | * is in same phase. |
1676 | * | |
c28bda25 | 1677 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1678 | * |
1679 | */ | |
1680 | ||
1681 | ||
c28bda25 RZ |
1682 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1683 | unsigned char *phase, int *count, | |
1684 | unsigned char **data) | |
1da177e4 | 1685 | { |
e8a60144 | 1686 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1687 | register int c = *count; |
1688 | register unsigned char p = *phase; | |
e3f463b0 FT |
1689 | |
1690 | #if defined(CONFIG_SUN3) | |
1691 | /* sanity check */ | |
1692 | if (!sun3_dma_setup_done) { | |
1693 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1694 | instance->host_no); | |
1695 | BUG(); | |
1696 | } | |
1697 | hostdata->dma_len = c; | |
1698 | ||
1699 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1700 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1701 | c, (p & SR_IO) ? "to" : "from", *data); | |
1702 | ||
1703 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1704 | |
1705 | /* send start chain */ | |
1706 | sun3scsi_dma_start(c, *data); | |
1707 | ||
cd400825 FT |
1708 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1709 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1710 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1711 | if (p & SR_IO) { |
e3f463b0 | 1712 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1713 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1714 | } else { | |
e3f463b0 | 1715 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1716 | NCR5380_write(START_DMA_SEND_REG, 0); |
1717 | } | |
1718 | ||
1719 | #ifdef SUN3_SCSI_VME | |
1720 | dregs->csr |= CSR_DMA_ENABLE; | |
1721 | #endif | |
1722 | ||
e3f463b0 FT |
1723 | sun3_dma_active = 1; |
1724 | ||
1725 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1726 | register unsigned char *d = *data; |
1727 | unsigned char tmp; | |
c28bda25 RZ |
1728 | |
1729 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1730 | *phase = tmp; | |
1731 | return -1; | |
1732 | } | |
1da177e4 | 1733 | |
ef1081cb FT |
1734 | if (hostdata->read_overruns && (p & SR_IO)) |
1735 | c -= hostdata->read_overruns; | |
1da177e4 | 1736 | |
d65e634a | 1737 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1738 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1739 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1740 | |
c28bda25 | 1741 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1742 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1743 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1744 | |
ef1081cb | 1745 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1746 | /* On the Medusa, it is a must to initialize the DMA before |
1747 | * starting the NCR. This is also the cleaner way for the TT. | |
1748 | */ | |
c28bda25 RZ |
1749 | hostdata->dma_len = (p & SR_IO) ? |
1750 | NCR5380_dma_read_setup(instance, d, c) : | |
1751 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1752 | } |
1753 | ||
1754 | if (p & SR_IO) | |
1755 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1756 | else { | |
1757 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1758 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1759 | } | |
1760 | ||
ef1081cb | 1761 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1762 | /* On the Falcon, the DMA setup must be done after the last */ |
1763 | /* NCR access, else the DMA setup gets trashed! | |
1764 | */ | |
c28bda25 RZ |
1765 | hostdata->dma_len = (p & SR_IO) ? |
1766 | NCR5380_dma_read_setup(instance, d, c) : | |
1767 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1768 | } |
e3f463b0 FT |
1769 | #endif /* !defined(CONFIG_SUN3) */ |
1770 | ||
c28bda25 | 1771 | return 0; |
1da177e4 LT |
1772 | } |
1773 | #endif /* defined(REAL_DMA) */ | |
1774 | ||
1775 | /* | |
1776 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1777 | * | |
c28bda25 RZ |
1778 | * Purpose : run through the various SCSI phases and do as the target |
1779 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1780 | * instance->connected. |
1781 | * | |
1782 | * Inputs : instance, instance for which we are doing commands | |
1783 | * | |
c28bda25 | 1784 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1785 | * modified if a command disconnects, *instance->connected will |
1786 | * change. | |
1787 | * | |
c28bda25 RZ |
1788 | * XXX Note : we need to watch for bus free or a reset condition here |
1789 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1790 | */ |
c28bda25 RZ |
1791 | |
1792 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1793 | { |
e8a60144 | 1794 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1795 | unsigned char msgout = NOP; |
1796 | int sink = 0; | |
1797 | int len; | |
1da177e4 | 1798 | #if defined(REAL_DMA) |
c28bda25 | 1799 | int transfersize; |
1da177e4 | 1800 | #endif |
c28bda25 RZ |
1801 | unsigned char *data; |
1802 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1803 | struct scsi_cmnd *cmd; |
c28bda25 | 1804 | |
e3f463b0 FT |
1805 | #ifdef SUN3_SCSI_VME |
1806 | dregs->csr |= CSR_INTR; | |
1807 | #endif | |
1808 | ||
11d2f63b | 1809 | while ((cmd = hostdata->connected)) { |
32b26a10 FT |
1810 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
1811 | ||
c28bda25 RZ |
1812 | tmp = NCR5380_read(STATUS_REG); |
1813 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1814 | if (tmp & SR_REQ) { | |
1815 | phase = (tmp & PHASE_MASK); | |
1816 | if (phase != old_phase) { | |
1817 | old_phase = phase; | |
8ad3a593 | 1818 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1819 | } |
e3f463b0 FT |
1820 | #if defined(CONFIG_SUN3) |
1821 | if (phase == PHASE_CMDOUT) { | |
1822 | #if defined(REAL_DMA) | |
1823 | void *d; | |
1824 | unsigned long count; | |
1825 | ||
1826 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1827 | count = cmd->SCp.buffer->length; | |
1828 | d = sg_virt(cmd->SCp.buffer); | |
1829 | } else { | |
1830 | count = cmd->SCp.this_residual; | |
1831 | d = cmd->SCp.ptr; | |
1832 | } | |
1833 | /* this command setup for dma yet? */ | |
1834 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1835 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
1836 | sun3scsi_dma_setup(d, count, | |
1837 | rq_data_dir(cmd->request)); | |
1838 | sun3_dma_setup_done = cmd; | |
1839 | } | |
1840 | } | |
1841 | #endif | |
1842 | #ifdef SUN3_SCSI_VME | |
1843 | dregs->csr |= CSR_INTR; | |
1844 | #endif | |
1845 | } | |
1846 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1847 | |
c28bda25 RZ |
1848 | if (sink && (phase != PHASE_MSGOUT)) { |
1849 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1850 | ||
1851 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1852 | ICR_ASSERT_ACK); | |
1853 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1854 | ; | |
1855 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1856 | ICR_ASSERT_ATN); | |
1857 | sink = 0; | |
1858 | continue; | |
1859 | } | |
1860 | ||
1861 | switch (phase) { | |
1862 | case PHASE_DATAOUT: | |
1da177e4 | 1863 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
1864 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
1865 | "aborted\n", HOSTNO); | |
1866 | sink = 1; | |
1867 | do_abort(instance); | |
1868 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1869 | cmd->scsi_done(cmd); |
c28bda25 | 1870 | return; |
1da177e4 | 1871 | #endif |
c28bda25 RZ |
1872 | case PHASE_DATAIN: |
1873 | /* | |
1874 | * If there is no room left in the current buffer in the | |
1875 | * scatter-gather list, move onto the next one. | |
1876 | */ | |
1877 | ||
1878 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1879 | ++cmd->SCp.buffer; | |
1880 | --cmd->SCp.buffers_residual; | |
1881 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1882 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1883 | /* ++roman: Try to merge some scatter-buffers if |
1884 | * they are at contiguous physical addresses. | |
1885 | */ | |
1886 | merge_contiguous_buffers(cmd); | |
d65e634a | 1887 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
1888 | HOSTNO, cmd->SCp.this_residual, |
1889 | cmd->SCp.buffers_residual); | |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * The preferred transfer method is going to be | |
1894 | * PSEUDO-DMA for systems that are strictly PIO, | |
1895 | * since we can let the hardware do the handshaking. | |
1896 | * | |
1897 | * For this to work, we need to know the transfersize | |
1898 | * ahead of time, since the pseudo-DMA code will sit | |
1899 | * in an unconditional loop. | |
1900 | */ | |
1901 | ||
1902 | /* ++roman: I suggest, this should be | |
1903 | * #if def(REAL_DMA) | |
1904 | * instead of leaving REAL_DMA out. | |
1905 | */ | |
1da177e4 LT |
1906 | |
1907 | #if defined(REAL_DMA) | |
e3f463b0 | 1908 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1909 | transfersize = 0; |
1910 | if (!cmd->device->borken) | |
e3f463b0 | 1911 | #endif |
ff3d4578 FT |
1912 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1913 | ||
1914 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
1915 | len = transfersize; |
1916 | cmd->SCp.phase = phase; | |
1917 | if (NCR5380_transfer_dma(instance, &phase, | |
1918 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1919 | /* | |
1920 | * If the watchdog timer fires, all future | |
1921 | * accesses to this device will use the | |
1922 | * polled-IO. */ | |
ff50f9ed FT |
1923 | scmd_printk(KERN_INFO, cmd, |
1924 | "switching to slow handshake\n"); | |
c28bda25 | 1925 | cmd->device->borken = 1; |
c28bda25 RZ |
1926 | sink = 1; |
1927 | do_abort(instance); | |
1928 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1929 | cmd->scsi_done(cmd); |
c28bda25 RZ |
1930 | /* XXX - need to source or sink data here, as appropriate */ |
1931 | } else { | |
1da177e4 | 1932 | #ifdef REAL_DMA |
c28bda25 RZ |
1933 | /* ++roman: When using real DMA, |
1934 | * information_transfer() should return after | |
1935 | * starting DMA since it has nothing more to | |
1936 | * do. | |
1937 | */ | |
1938 | return; | |
1939 | #else | |
1940 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 1941 | #endif |
c28bda25 RZ |
1942 | } |
1943 | } else | |
1da177e4 | 1944 | #endif /* defined(REAL_DMA) */ |
11d2f63b FT |
1945 | { |
1946 | spin_unlock_irq(&hostdata->lock); | |
c28bda25 RZ |
1947 | NCR5380_transfer_pio(instance, &phase, |
1948 | (int *)&cmd->SCp.this_residual, | |
1949 | (unsigned char **)&cmd->SCp.ptr); | |
11d2f63b FT |
1950 | spin_lock_irq(&hostdata->lock); |
1951 | } | |
e3f463b0 FT |
1952 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
1953 | /* if we had intended to dma that command clear it */ | |
1954 | if (sun3_dma_setup_done == cmd) | |
1955 | sun3_dma_setup_done = NULL; | |
1956 | #endif | |
c28bda25 RZ |
1957 | break; |
1958 | case PHASE_MSGIN: | |
1959 | len = 1; | |
1960 | data = &tmp; | |
c28bda25 RZ |
1961 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
1962 | cmd->SCp.Message = tmp; | |
1963 | ||
1964 | switch (tmp) { | |
c28bda25 RZ |
1965 | case ABORT: |
1966 | case COMMAND_COMPLETE: | |
1967 | /* Accept message by clearing ACK */ | |
1968 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
0d3d9a42 FT |
1969 | dsprintk(NDEBUG_QUEUES, instance, |
1970 | "COMMAND COMPLETE %p target %d lun %llu\n", | |
1971 | cmd, scmd_id(cmd), cmd->device->lun); | |
e3c3da67 | 1972 | |
e3c3da67 | 1973 | hostdata->connected = NULL; |
1da177e4 | 1974 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
1975 | cmd_free_tag(cmd); |
1976 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
61d739a4 | 1977 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][cmd->device->lun]; |
9cb78c16 | 1978 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
1979 | "QUEUE_FULL after %d commands\n", |
1980 | HOSTNO, cmd->device->id, cmd->device->lun, | |
1981 | ta->nr_allocated); | |
1982 | if (ta->queue_size > ta->nr_allocated) | |
e42d0151 | 1983 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 1984 | } |
1da177e4 | 1985 | #else |
c28bda25 | 1986 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 1987 | #endif |
c28bda25 RZ |
1988 | |
1989 | /* | |
1990 | * I'm not sure what the correct thing to do here is : | |
1991 | * | |
1992 | * If the command that just executed is NOT a request | |
1993 | * sense, the obvious thing to do is to set the result | |
1994 | * code to the values of the stored parameters. | |
1995 | * | |
1996 | * If it was a REQUEST SENSE command, we need some way to | |
1997 | * differentiate between the failure code of the original | |
1998 | * and the failure code of the REQUEST sense - the obvious | |
1999 | * case is success, where we fall through and leave the | |
2000 | * result code unchanged. | |
2001 | * | |
2002 | * The non-obvious place is where the REQUEST SENSE failed | |
2003 | */ | |
2004 | ||
2005 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2006 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2007 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2008 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2009 | |
28424d3a BH |
2010 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2011 | hostdata->ses.cmd_len) { | |
2012 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2013 | hostdata->ses.cmd_len = 0 ; | |
2014 | } | |
2015 | ||
c28bda25 RZ |
2016 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2017 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2018 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2019 | ||
32b26a10 | 2020 | list_add(&ncmd->list, &hostdata->unissued); |
0d3d9a42 FT |
2021 | dsprintk(NDEBUG_AUTOSENSE | NDEBUG_QUEUES, |
2022 | instance, "REQUEST SENSE cmd %p added to head of issue queue\n", | |
dbb6b350 | 2023 | cmd); |
997acab7 | 2024 | } else { |
c28bda25 RZ |
2025 | cmd->scsi_done(cmd); |
2026 | } | |
2027 | ||
c28bda25 RZ |
2028 | /* |
2029 | * Restore phase bits to 0 so an interrupted selection, | |
2030 | * arbitration can resume. | |
2031 | */ | |
2032 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2033 | ||
72064a78 FT |
2034 | /* Enable reselect interrupts */ |
2035 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2036 | ||
c28bda25 RZ |
2037 | /* ++roman: For Falcon SCSI, release the lock on the |
2038 | * ST-DMA here if no other commands are waiting on the | |
2039 | * disconnected queue. | |
2040 | */ | |
e3c3da67 | 2041 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2042 | return; |
2043 | case MESSAGE_REJECT: | |
2044 | /* Accept message by clearing ACK */ | |
2045 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2046 | switch (hostdata->last_message) { |
2047 | case HEAD_OF_QUEUE_TAG: | |
2048 | case ORDERED_QUEUE_TAG: | |
2049 | case SIMPLE_QUEUE_TAG: | |
2050 | /* The target obviously doesn't support tagged | |
2051 | * queuing, even though it announced this ability in | |
2052 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2053 | * clear 'tagged_supported' and lock the LUN, since | |
2054 | * the command is treated as untagged further on. | |
2055 | */ | |
2056 | cmd->device->tagged_supported = 0; | |
2057 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2058 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2059 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2060 | "QUEUE_TAG message; tagged queuing " |
2061 | "disabled\n", | |
2062 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2063 | break; | |
2064 | } | |
2065 | break; | |
2066 | case DISCONNECT: | |
2067 | /* Accept message by clearing ACK */ | |
2068 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 | 2069 | hostdata->connected = NULL; |
32b26a10 | 2070 | list_add(&ncmd->list, &hostdata->disconnected); |
0d3d9a42 FT |
2071 | dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, |
2072 | instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", | |
2073 | cmd, scmd_id(cmd), cmd->device->lun); | |
2074 | ||
c28bda25 RZ |
2075 | /* |
2076 | * Restore phase bits to 0 so an interrupted selection, | |
2077 | * arbitration can resume. | |
2078 | */ | |
2079 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2080 | ||
2081 | /* Enable reselect interrupts */ | |
2082 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2083 | #ifdef SUN3_SCSI_VME |
2084 | dregs->csr |= CSR_DMA_ENABLE; | |
2085 | #endif | |
c28bda25 RZ |
2086 | return; |
2087 | /* | |
2088 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2089 | * operation, in violation of the SCSI spec so we can safely | |
2090 | * ignore SAVE/RESTORE pointers calls. | |
2091 | * | |
2092 | * Unfortunately, some disks violate the SCSI spec and | |
2093 | * don't issue the required SAVE_POINTERS message before | |
2094 | * disconnecting, and we have to break spec to remain | |
2095 | * compatible. | |
2096 | */ | |
2097 | case SAVE_POINTERS: | |
2098 | case RESTORE_POINTERS: | |
2099 | /* Accept message by clearing ACK */ | |
2100 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2101 | break; |
2102 | case EXTENDED_MESSAGE: | |
2103 | /* | |
2104 | * Extended messages are sent in the following format : | |
2105 | * Byte | |
2106 | * 0 EXTENDED_MESSAGE == 1 | |
2107 | * 1 length (includes one byte for code, doesn't | |
2108 | * include first two bytes) | |
2109 | * 2 code | |
2110 | * 3..length+1 arguments | |
2111 | * | |
2112 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2113 | * byte, since spi_print_msg() wants the whole thing. | |
2114 | */ | |
2115 | extended_msg[0] = EXTENDED_MESSAGE; | |
2116 | /* Accept first byte by clearing ACK */ | |
2117 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2118 | ||
11d2f63b FT |
2119 | spin_unlock_irq(&hostdata->lock); |
2120 | ||
d65e634a | 2121 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2122 | |
2123 | len = 2; | |
2124 | data = extended_msg + 1; | |
2125 | phase = PHASE_MSGIN; | |
2126 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2127 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2128 | (int)extended_msg[1], (int)extended_msg[2]); |
2129 | ||
e0783ed3 FT |
2130 | if (!len && extended_msg[1] > 0 && |
2131 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2132 | /* Accept third byte by clearing ACK */ |
2133 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2134 | len = extended_msg[1] - 1; | |
2135 | data = extended_msg + 3; | |
2136 | phase = PHASE_MSGIN; | |
2137 | ||
2138 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2139 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2140 | HOSTNO, len); |
2141 | ||
2142 | switch (extended_msg[2]) { | |
2143 | case EXTENDED_SDTR: | |
2144 | case EXTENDED_WDTR: | |
2145 | case EXTENDED_MODIFY_DATA_POINTER: | |
2146 | case EXTENDED_EXTENDED_IDENTIFY: | |
2147 | tmp = 0; | |
2148 | } | |
2149 | } else if (len) { | |
2150 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2151 | "extended message\n", HOSTNO); | |
2152 | tmp = 0; | |
2153 | } else { | |
2154 | printk(KERN_NOTICE "scsi%d: extended message " | |
2155 | "code %02x length %d is too long\n", | |
2156 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2157 | tmp = 0; | |
2158 | } | |
11d2f63b FT |
2159 | |
2160 | spin_lock_irq(&hostdata->lock); | |
2161 | if (!hostdata->connected) | |
2162 | return; | |
2163 | ||
c28bda25 RZ |
2164 | /* Fall through to reject message */ |
2165 | ||
2166 | /* | |
2167 | * If we get something weird that we aren't expecting, | |
2168 | * reject it. | |
2169 | */ | |
2170 | default: | |
2171 | if (!tmp) { | |
ff50f9ed FT |
2172 | printk(KERN_INFO "scsi%d: rejecting message ", |
2173 | instance->host_no); | |
c28bda25 RZ |
2174 | spi_print_msg(extended_msg); |
2175 | printk("\n"); | |
2176 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2177 | scmd_printk(KERN_INFO, cmd, |
2178 | "rejecting unknown message %02x\n", | |
2179 | tmp); | |
c28bda25 | 2180 | else |
ff50f9ed FT |
2181 | scmd_printk(KERN_INFO, cmd, |
2182 | "rejecting unknown extended message code %02x, length %d\n", | |
2183 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2184 | |
2185 | msgout = MESSAGE_REJECT; | |
2186 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2187 | break; | |
2188 | } /* switch (tmp) */ | |
2189 | break; | |
2190 | case PHASE_MSGOUT: | |
2191 | len = 1; | |
2192 | data = &msgout; | |
2193 | hostdata->last_message = msgout; | |
2194 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2195 | if (msgout == ABORT) { | |
1da177e4 | 2196 | #ifdef SUPPORT_TAGS |
c28bda25 | 2197 | cmd_free_tag(cmd); |
1da177e4 | 2198 | #else |
c28bda25 | 2199 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2200 | #endif |
c28bda25 RZ |
2201 | hostdata->connected = NULL; |
2202 | cmd->result = DID_ERROR << 16; | |
e3c3da67 | 2203 | maybe_release_dma_irq(instance); |
e3c3da67 | 2204 | cmd->scsi_done(cmd); |
cd400825 | 2205 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2206 | return; |
2207 | } | |
2208 | msgout = NOP; | |
2209 | break; | |
2210 | case PHASE_CMDOUT: | |
2211 | len = cmd->cmd_len; | |
2212 | data = cmd->cmnd; | |
2213 | /* | |
2214 | * XXX for performance reasons, on machines with a | |
2215 | * PSEUDO-DMA architecture we should probably | |
2216 | * use the dma transfer function. | |
2217 | */ | |
2218 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2219 | break; | |
2220 | case PHASE_STATIN: | |
2221 | len = 1; | |
2222 | data = &tmp; | |
2223 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2224 | cmd->SCp.Status = tmp; | |
2225 | break; | |
2226 | default: | |
2227 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2228 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2229 | } /* switch(phase) */ |
686f3990 | 2230 | } else { |
11d2f63b | 2231 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2232 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2233 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2234 | } |
11d2f63b | 2235 | } |
1da177e4 LT |
2236 | } |
2237 | ||
2238 | /* | |
2239 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2240 | * | |
c28bda25 | 2241 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2242 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2243 | * nexus has been reestablished, |
c28bda25 | 2244 | * |
1da177e4 LT |
2245 | * Inputs : instance - this instance of the NCR5380. |
2246 | * | |
2247 | */ | |
2248 | ||
2249 | ||
e3f463b0 FT |
2250 | /* it might eventually prove necessary to do a dma setup on |
2251 | reselection, but it doesn't seem to be needed now -- sam */ | |
2252 | ||
c28bda25 | 2253 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2254 | { |
e8a60144 | 2255 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2256 | unsigned char target_mask; |
e3f463b0 | 2257 | unsigned char lun; |
1da177e4 | 2258 | #ifdef SUPPORT_TAGS |
c28bda25 | 2259 | unsigned char tag; |
1da177e4 | 2260 | #endif |
c28bda25 | 2261 | unsigned char msg[3]; |
e3f463b0 FT |
2262 | int __maybe_unused len; |
2263 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
32b26a10 FT |
2264 | struct NCR5380_cmd *ncmd; |
2265 | struct scsi_cmnd *tmp; | |
c28bda25 RZ |
2266 | |
2267 | /* | |
2268 | * Disable arbitration, etc. since the host adapter obviously | |
2269 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2270 | */ | |
2271 | ||
2272 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2273 | |
2274 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2275 | ||
d65e634a | 2276 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2277 | |
2278 | /* | |
2279 | * At this point, we have detected that our SCSI ID is on the bus, | |
2280 | * SEL is true and BSY was false for at least one bus settle delay | |
2281 | * (400 ns). | |
2282 | * | |
2283 | * We must assert BSY ourselves, until the target drops the SEL | |
2284 | * signal. | |
2285 | */ | |
2286 | ||
2287 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2288 | if (NCR5380_poll_politely(instance, |
2289 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2290 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2291 | return; | |
2292 | } | |
c28bda25 RZ |
2293 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2294 | ||
2295 | /* | |
2296 | * Wait for target to go into MSGIN. | |
2297 | */ | |
2298 | ||
72064a78 FT |
2299 | if (NCR5380_poll_politely(instance, |
2300 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2301 | do_abort(instance); | |
2302 | return; | |
2303 | } | |
c28bda25 | 2304 | |
e3f463b0 FT |
2305 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2306 | /* acknowledge toggle to MSGIN */ | |
2307 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2308 | ||
2309 | /* peek at the byte without really hitting the bus */ | |
2310 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2311 | #else | |
c28bda25 RZ |
2312 | len = 1; |
2313 | data = msg; | |
2314 | phase = PHASE_MSGIN; | |
2315 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2316 | |
2317 | if (len) { | |
2318 | do_abort(instance); | |
2319 | return; | |
2320 | } | |
e3f463b0 | 2321 | #endif |
c28bda25 RZ |
2322 | |
2323 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2324 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2325 | spi_print_msg(msg); |
72064a78 | 2326 | printk("\n"); |
c28bda25 RZ |
2327 | do_abort(instance); |
2328 | return; | |
2329 | } | |
72064a78 | 2330 | lun = msg[0] & 0x07; |
1da177e4 | 2331 | |
e3f463b0 | 2332 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2333 | /* If the phase is still MSGIN, the target wants to send some more |
2334 | * messages. In case it supports tagged queuing, this is probably a | |
2335 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2336 | */ | |
2337 | tag = TAG_NONE; | |
ca513fc9 | 2338 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2339 | /* Accept previous IDENTIFY message by clearing ACK */ |
2340 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2341 | len = 2; | |
2342 | data = msg + 1; | |
2343 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2344 | msg[1] == SIMPLE_QUEUE_TAG) | |
2345 | tag = msg[2]; | |
d65e634a | 2346 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2347 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2348 | } | |
1da177e4 | 2349 | #endif |
c28bda25 RZ |
2350 | |
2351 | /* | |
2352 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2353 | * just reestablished, and remove it from the disconnected queue. | |
2354 | */ | |
2355 | ||
32b26a10 FT |
2356 | tmp = NULL; |
2357 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { | |
2358 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2359 | ||
2360 | if (target_mask == (1 << scmd_id(cmd)) && | |
2361 | lun == (u8)cmd->device->lun | |
1da177e4 | 2362 | #ifdef SUPPORT_TAGS |
32b26a10 | 2363 | && (tag == cmd->tag) |
1da177e4 | 2364 | #endif |
c28bda25 | 2365 | ) { |
32b26a10 FT |
2366 | list_del(&ncmd->list); |
2367 | tmp = cmd; | |
c28bda25 RZ |
2368 | break; |
2369 | } | |
1da177e4 | 2370 | } |
c28bda25 | 2371 | |
0d3d9a42 FT |
2372 | if (tmp) { |
2373 | dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, | |
2374 | "reselect: removed %p from disconnected queue\n", tmp); | |
2375 | } else { | |
2376 | ||
1da177e4 | 2377 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2378 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2379 | target_mask, lun, tag); | |
2380 | #else | |
2381 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2382 | target_mask, lun); | |
1da177e4 | 2383 | #endif |
c28bda25 RZ |
2384 | /* |
2385 | * Since we have an established nexus that we can't do anything | |
2386 | * with, we must abort it. | |
2387 | */ | |
2388 | do_abort(instance); | |
2389 | return; | |
2390 | } | |
1da177e4 | 2391 | |
e3f463b0 FT |
2392 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2393 | /* engage dma setup for the command we just saw */ | |
2394 | { | |
2395 | void *d; | |
2396 | unsigned long count; | |
2397 | ||
2398 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2399 | count = tmp->SCp.buffer->length; | |
2400 | d = sg_virt(tmp->SCp.buffer); | |
2401 | } else { | |
2402 | count = tmp->SCp.this_residual; | |
2403 | d = tmp->SCp.ptr; | |
2404 | } | |
2405 | /* setup this command for dma if not already */ | |
2406 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2407 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2408 | sun3_dma_setup_done = tmp; | |
2409 | } | |
2410 | } | |
2411 | ||
2412 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2413 | #endif | |
2414 | ||
c28bda25 RZ |
2415 | /* Accept message by clearing ACK */ |
2416 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2417 | |
e3f463b0 FT |
2418 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2419 | /* If the phase is still MSGIN, the target wants to send some more | |
2420 | * messages. In case it supports tagged queuing, this is probably a | |
2421 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2422 | */ | |
2423 | tag = TAG_NONE; | |
2424 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2425 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2426 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2427 | len = 2; | |
2428 | data = msg + 1; | |
2429 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2430 | msg[1] == SIMPLE_QUEUE_TAG) | |
2431 | tag = msg[2]; | |
2432 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2433 | HOSTNO, target_mask, lun, tag); | |
2434 | } | |
2435 | #endif | |
2436 | ||
c28bda25 | 2437 | hostdata->connected = tmp; |
9cb78c16 | 2438 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2439 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2440 | } |
2441 | ||
2442 | ||
2443 | /* | |
710ddd0d | 2444 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2445 | * |
2446 | * Purpose : abort a command | |
2447 | * | |
710ddd0d | 2448 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2449 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2450 | * used. |
2451 | * | |
b6c92b7e | 2452 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2453 | * |
c28bda25 RZ |
2454 | * XXX - there is no way to abort the command that is currently |
2455 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2456 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2457 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2458 | */ |
2459 | ||
2460 | static | |
710ddd0d | 2461 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2462 | { |
c28bda25 | 2463 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2464 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2465 | unsigned long flags; |
1da177e4 | 2466 | |
11d2f63b | 2467 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2468 | |
32b26a10 FT |
2469 | #if (NDEBUG & NDEBUG_ANY) |
2470 | scmd_printk(KERN_INFO, cmd, "aborting command\n"); | |
2471 | #endif | |
e5c3fddf FT |
2472 | NCR5380_dprint(NDEBUG_ANY, instance); |
2473 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2474 | |
11d2f63b | 2475 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2476 | |
2b0f834c | 2477 | return FAILED; |
1da177e4 LT |
2478 | } |
2479 | ||
2480 | ||
3be1b3ea FT |
2481 | /** |
2482 | * NCR5380_bus_reset - reset the SCSI bus | |
2483 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2484 | * |
3be1b3ea | 2485 | * Returns SUCCESS |
c28bda25 | 2486 | */ |
1da177e4 | 2487 | |
710ddd0d | 2488 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2489 | { |
e3c3da67 FT |
2490 | struct Scsi_Host *instance = cmd->device->host; |
2491 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2492 | int i; |
2493 | unsigned long flags; | |
1da177e4 | 2494 | |
11d2f63b | 2495 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2496 | |
2497 | #if (NDEBUG & NDEBUG_ANY) | |
2498 | scmd_printk(KERN_INFO, cmd, "performing bus reset\n"); | |
3be1b3ea | 2499 | #endif |
e5c3fddf FT |
2500 | NCR5380_dprint(NDEBUG_ANY, instance); |
2501 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2502 | |
2503 | do_reset(instance); | |
c28bda25 | 2504 | |
c28bda25 | 2505 | /* reset NCR registers */ |
c28bda25 RZ |
2506 | NCR5380_write(MODE_REG, MR_BASE); |
2507 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2508 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2509 | |
c28bda25 RZ |
2510 | /* After the reset, there are no more connected or disconnected commands |
2511 | * and no busy units; so clear the low-level status here to avoid | |
2512 | * conflicts when the mid-level code tries to wake up the affected | |
2513 | * commands! | |
2514 | */ | |
2515 | ||
c28bda25 | 2516 | if (hostdata->connected) |
dbb6b350 | 2517 | dsprintk(NDEBUG_ABORT, instance, "reset aborted a connected command\n"); |
c28bda25 | 2518 | hostdata->connected = NULL; |
32b26a10 FT |
2519 | |
2520 | if (!list_empty(&hostdata->unissued)) | |
2521 | dsprintk(NDEBUG_ABORT, instance, "reset aborted unissued list\n"); | |
2522 | INIT_LIST_HEAD(&hostdata->unissued); | |
2523 | ||
2524 | if (!list_empty(&hostdata->disconnected)) | |
2525 | dsprintk(NDEBUG_ABORT, instance, "reset aborted disconnected list\n"); | |
2526 | INIT_LIST_HEAD(&hostdata->disconnected); | |
2527 | ||
1da177e4 | 2528 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2529 | free_all_tags(hostdata); |
1da177e4 | 2530 | #endif |
c28bda25 RZ |
2531 | for (i = 0; i < 8; ++i) |
2532 | hostdata->busy[i] = 0; | |
1da177e4 | 2533 | #ifdef REAL_DMA |
c28bda25 | 2534 | hostdata->dma_len = 0; |
1da177e4 | 2535 | #endif |
e3c3da67 FT |
2536 | |
2537 | maybe_release_dma_irq(instance); | |
11d2f63b | 2538 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2539 | |
2b0f834c | 2540 | return SUCCESS; |
1da177e4 | 2541 | } |