Commit | Line | Data |
---|---|---|
c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
594d4ba3 FT |
3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
4 | * architecture. | |
1da177e4 | 5 | * |
594d4ba3 | 6 | * Note that these routines also work with NR53c400 family chips. |
1da177e4 LT |
7 | * |
8 | * Copyright 1993, Drew Eckhardt | |
594d4ba3 FT |
9 | * Visionary Computing |
10 | * (Unix and Linux consulting and custom programming) | |
11 | * drew@colorado.edu | |
12 | * +1 (303) 666-5836 | |
1da177e4 | 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 | ||
c16df32e | 27 | /* Ported to Atari by Roman Hodek and others. */ |
1da177e4 | 28 | |
e3f463b0 FT |
29 | /* Adapted for the sun3 by Sam Creasey. */ |
30 | ||
1da177e4 LT |
31 | /* |
32 | * Design | |
1da177e4 | 33 | * |
c28bda25 | 34 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 35 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 36 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
37 | * memory mapped) and drops this file in their 'C' wrapper. |
38 | * | |
c28bda25 | 39 | * As far as command queueing, two queues are maintained for |
1da177e4 | 40 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
41 | * and commands that are currently executing. This means that an |
42 | * unlimited number of commands may be queued, letting | |
43 | * more commands propagate from the higher driver levels giving higher | |
44 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
45 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
46 | * while a command is already executing. |
47 | * | |
1da177e4 | 48 | * |
c28bda25 | 49 | * Issues specific to the NCR5380 : |
1da177e4 | 50 | * |
c28bda25 RZ |
51 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
52 | * piece of hardware that requires you to sit in a loop polling for | |
53 | * the REQ signal as long as you are connected. Some devices are | |
54 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
686f3990 | 55 | * while doing long seek operations. [...] These |
1da177e4 LT |
56 | * broken devices are the exception rather than the rule and I'd rather |
57 | * spend my time optimizing for the normal case. | |
58 | * | |
59 | * Architecture : | |
60 | * | |
61 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
62 | * which is started from a workqueue for each NCR5380 host in the |
63 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
64 | * removing the commands from the issue queue and calling | |
65 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
66 | * |
67 | * Once a nexus is established, the NCR5380_information_transfer() | |
68 | * phase goes through the various phases as instructed by the target. | |
69 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
70 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
71 | * queue, and NCR5380_main tries to find more work. If the target is |
72 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
73 | * |
74 | * If a command has disconnected, eventually an interrupt will trigger, | |
75 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
76 | * to reestablish a nexus. This will run main if necessary. | |
77 | * | |
c28bda25 | 78 | * On command termination, the done function will be called as |
1da177e4 LT |
79 | * appropriate. |
80 | * | |
c28bda25 | 81 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
82 | * structures, being initialized after the command is connected |
83 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
84 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
85 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
86 | */ | |
87 | ||
88 | /* | |
89 | * Using this file : | |
90 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 91 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
92 | * and macros and include this file in your driver. |
93 | * | |
c28bda25 | 94 | * These macros control options : |
1da177e4 | 95 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
594d4ba3 | 96 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 97 | * |
ff50f9ed | 98 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
594d4ba3 | 99 | * transceivers. |
ff50f9ed | 100 | * |
1da177e4 LT |
101 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
102 | * | |
103 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
104 | * | |
105 | * These macros MUST be defined : | |
c28bda25 | 106 | * |
1da177e4 LT |
107 | * NCR5380_read(register) - read from the specified register |
108 | * | |
c28bda25 | 109 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 110 | * |
ff50f9ed | 111 | * NCR5380_implementation_fields - additional fields needed for this |
594d4ba3 | 112 | * specific implementation of the NCR5380 |
ff50f9ed | 113 | * |
1da177e4 | 114 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 115 | * REAL functions : |
1da177e4 | 116 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 117 | * Note that the DMA setup functions should return the number of bytes |
594d4ba3 | 118 | * that they were able to program the controller for. |
1da177e4 | 119 | * |
c28bda25 | 120 | * Also note that generic i386/PC versions of these macros are |
594d4ba3 FT |
121 | * available as NCR5380_i386_dma_write_setup, |
122 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
1da177e4 LT |
123 | * |
124 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
125 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
126 | * NCR5380_dma_residual(instance); - residual count | |
127 | * | |
128 | * PSEUDO functions : | |
129 | * NCR5380_pwrite(instance, src, count) | |
130 | * NCR5380_pread(instance, dst, count); | |
131 | * | |
1da177e4 | 132 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 133 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 134 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 135 | * possible) function may be used. |
1da177e4 LT |
136 | */ |
137 | ||
636b1ec8 FT |
138 | static int do_abort(struct Scsi_Host *); |
139 | static void do_reset(struct Scsi_Host *); | |
140 | ||
1da177e4 LT |
141 | #ifdef SUPPORT_TAGS |
142 | ||
143 | /* | |
144 | * Functions for handling tagged queuing | |
145 | * ===================================== | |
146 | * | |
147 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
148 | * | |
149 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
150 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
151 | * command has been preempted for a long time. My solution: a bitfield for | |
152 | * remembering used tags. | |
153 | * | |
154 | * There's also the problem that each target has a certain queue size, but we | |
155 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
156 | * returned. So, in this case, the driver internal queue size assumption is | |
157 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
e42d0151 | 158 | * target. |
1da177e4 LT |
159 | * |
160 | * We're also not allowed running tagged commands as long as an untagged | |
161 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
162 | * condition _must_ be untagged. To keep track whether an untagged command has | |
163 | * been issued, the host->busy array is still employed, as it is without | |
164 | * support for tagged queuing. | |
165 | * | |
166 | * One could suspect that there are possible race conditions between | |
167 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
168 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
169 | * which already guaranteed to be running at most once. It is also the only | |
170 | * place where tags/LUNs are allocated. So no other allocation can slip | |
171 | * between that pair, there could only happen a reselection, which can free a | |
172 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
173 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
174 | */ | |
175 | ||
ca513fc9 | 176 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 177 | { |
c28bda25 | 178 | int target, lun; |
61d739a4 | 179 | struct tag_alloc *ta; |
c28bda25 | 180 | |
ca513fc9 | 181 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
182 | return; |
183 | ||
184 | for (target = 0; target < 8; ++target) { | |
185 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 186 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
187 | bitmap_zero(ta->allocated, MAX_TAGS); |
188 | ta->nr_allocated = 0; | |
189 | /* At the beginning, assume the maximum queue size we could | |
190 | * support (MAX_TAGS). This value will be decreased if the target | |
191 | * returns QUEUE_FULL status. | |
192 | */ | |
193 | ta->queue_size = MAX_TAGS; | |
194 | } | |
1da177e4 | 195 | } |
1da177e4 LT |
196 | } |
197 | ||
198 | ||
199 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
200 | * busy by an untagged command. If the command should use tagged queuing, also | |
201 | * check that there is a free tag and the target's queue won't overflow. This | |
202 | * function should be called with interrupts disabled to avoid race | |
203 | * conditions. | |
c28bda25 | 204 | */ |
1da177e4 | 205 | |
710ddd0d | 206 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 207 | { |
9cb78c16 | 208 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
209 | struct Scsi_Host *instance = cmd->device->host; |
210 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 | 211 | |
9cb78c16 | 212 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
213 | return 1; |
214 | if (!should_be_tagged || | |
ca513fc9 FT |
215 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
216 | !cmd->device->tagged_supported) | |
c28bda25 | 217 | return 0; |
61d739a4 FT |
218 | if (hostdata->TagAlloc[scmd_id(cmd)][lun].nr_allocated >= |
219 | hostdata->TagAlloc[scmd_id(cmd)][lun].queue_size) { | |
dbb6b350 FT |
220 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d: no free tags\n", |
221 | scmd_id(cmd), lun); | |
c28bda25 RZ |
222 | return 1; |
223 | } | |
224 | return 0; | |
1da177e4 LT |
225 | } |
226 | ||
227 | ||
228 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
229 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
230 | * untagged. | |
231 | */ | |
232 | ||
710ddd0d | 233 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 234 | { |
9cb78c16 | 235 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
236 | struct Scsi_Host *instance = cmd->device->host; |
237 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
238 | |
239 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
240 | * an untagged command. | |
241 | */ | |
242 | if (!should_be_tagged || | |
ca513fc9 FT |
243 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
244 | !cmd->device->tagged_supported) { | |
c28bda25 | 245 | cmd->tag = TAG_NONE; |
9cb78c16 | 246 | hostdata->busy[cmd->device->id] |= (1 << lun); |
dbb6b350 FT |
247 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d now allocated by untagged command\n", |
248 | scmd_id(cmd), lun); | |
c28bda25 | 249 | } else { |
61d739a4 | 250 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
251 | |
252 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
253 | set_bit(cmd->tag, ta->allocated); | |
254 | ta->nr_allocated++; | |
dbb6b350 FT |
255 | dsprintk(NDEBUG_TAGS, instance, "using tag %d for target %d lun %d (%d tags allocated)\n", |
256 | cmd->tag, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 257 | } |
1da177e4 LT |
258 | } |
259 | ||
260 | ||
261 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
262 | * unlock the LUN. | |
263 | */ | |
264 | ||
710ddd0d | 265 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 266 | { |
9cb78c16 | 267 | u8 lun = cmd->device->lun; |
dbb6b350 FT |
268 | struct Scsi_Host *instance = cmd->device->host; |
269 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
270 | |
271 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 272 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
dbb6b350 FT |
273 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %d untagged cmd freed\n", |
274 | scmd_id(cmd), lun); | |
c28bda25 | 275 | } else if (cmd->tag >= MAX_TAGS) { |
dbb6b350 FT |
276 | shost_printk(KERN_NOTICE, instance, |
277 | "trying to free bad tag %d!\n", cmd->tag); | |
c28bda25 | 278 | } else { |
61d739a4 | 279 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; |
c28bda25 RZ |
280 | clear_bit(cmd->tag, ta->allocated); |
281 | ta->nr_allocated--; | |
dbb6b350 FT |
282 | dsprintk(NDEBUG_TAGS, instance, "freed tag %d for target %d lun %d\n", |
283 | cmd->tag, scmd_id(cmd), lun); | |
c28bda25 | 284 | } |
1da177e4 LT |
285 | } |
286 | ||
287 | ||
ca513fc9 | 288 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 289 | { |
c28bda25 | 290 | int target, lun; |
61d739a4 | 291 | struct tag_alloc *ta; |
c28bda25 | 292 | |
ca513fc9 | 293 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
294 | return; |
295 | ||
296 | for (target = 0; target < 8; ++target) { | |
297 | for (lun = 0; lun < 8; ++lun) { | |
61d739a4 | 298 | ta = &hostdata->TagAlloc[target][lun]; |
c28bda25 RZ |
299 | bitmap_zero(ta->allocated, MAX_TAGS); |
300 | ta->nr_allocated = 0; | |
301 | } | |
1da177e4 | 302 | } |
1da177e4 LT |
303 | } |
304 | ||
305 | #endif /* SUPPORT_TAGS */ | |
306 | ||
c16df32e FT |
307 | /** |
308 | * merge_contiguous_buffers - coalesce scatter-gather list entries | |
309 | * @cmd: command requesting IO | |
310 | * | |
311 | * Try to merge several scatter-gather buffers into one DMA transfer. | |
312 | * This is possible if the scatter buffers lie on physically | |
313 | * contiguous addresses. The first scatter-gather buffer's data are | |
314 | * assumed to be already transferred into cmd->SCp.this_residual. | |
315 | * Every buffer merged avoids an interrupt and a DMA setup operation. | |
1da177e4 LT |
316 | */ |
317 | ||
710ddd0d | 318 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 319 | { |
e3f463b0 | 320 | #if !defined(CONFIG_SUN3) |
c28bda25 | 321 | unsigned long endaddr; |
1da177e4 | 322 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
323 | unsigned long oldlen = cmd->SCp.this_residual; |
324 | int cnt = 1; | |
1da177e4 LT |
325 | #endif |
326 | ||
c28bda25 RZ |
327 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
328 | cmd->SCp.buffers_residual && | |
5a1cb47f | 329 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 330 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 331 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 332 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 333 | ++cnt; |
1da177e4 | 334 | #endif |
c28bda25 RZ |
335 | ++cmd->SCp.buffer; |
336 | --cmd->SCp.buffers_residual; | |
337 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
338 | endaddr += cmd->SCp.buffer->length; | |
339 | } | |
1da177e4 | 340 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 341 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 342 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 343 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 344 | #endif |
e3f463b0 | 345 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
346 | } |
347 | ||
ff50f9ed FT |
348 | /** |
349 | * initialize_SCp - init the scsi pointer field | |
350 | * @cmd: command block to set up | |
1da177e4 | 351 | * |
ff50f9ed | 352 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
353 | */ |
354 | ||
710ddd0d | 355 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 356 | { |
c28bda25 RZ |
357 | /* |
358 | * Initialize the Scsi Pointer field so that all of the commands in the | |
359 | * various queues are valid. | |
1da177e4 | 360 | */ |
c28bda25 | 361 | |
9e0fe44d BH |
362 | if (scsi_bufflen(cmd)) { |
363 | cmd->SCp.buffer = scsi_sglist(cmd); | |
364 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 365 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 | 366 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
c16df32e | 367 | |
c28bda25 RZ |
368 | merge_contiguous_buffers(cmd); |
369 | } else { | |
370 | cmd->SCp.buffer = NULL; | |
371 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
372 | cmd->SCp.ptr = NULL; |
373 | cmd->SCp.this_residual = 0; | |
c28bda25 | 374 | } |
f27db8eb FT |
375 | |
376 | cmd->SCp.Status = 0; | |
377 | cmd->SCp.Message = 0; | |
1da177e4 LT |
378 | } |
379 | ||
636b1ec8 | 380 | /** |
b32ade12 | 381 | * NCR5380_poll_politely2 - wait for two chip register values |
636b1ec8 | 382 | * @instance: controller to poll |
b32ade12 FT |
383 | * @reg1: 5380 register to poll |
384 | * @bit1: Bitmask to check | |
385 | * @val1: Expected value | |
386 | * @reg2: Second 5380 register to poll | |
387 | * @bit2: Second bitmask to check | |
388 | * @val2: Second expected value | |
2f854b82 | 389 | * @wait: Time-out in jiffies |
636b1ec8 | 390 | * |
2f854b82 FT |
391 | * Polls the chip in a reasonably efficient manner waiting for an |
392 | * event to occur. After a short quick poll we begin to yield the CPU | |
393 | * (if possible). In irq contexts the time-out is arbitrarily limited. | |
394 | * Callers may hold locks as long as they are held in irq mode. | |
636b1ec8 | 395 | * |
b32ade12 | 396 | * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
636b1ec8 FT |
397 | */ |
398 | ||
b32ade12 FT |
399 | static int NCR5380_poll_politely2(struct Scsi_Host *instance, |
400 | int reg1, int bit1, int val1, | |
401 | int reg2, int bit2, int val2, int wait) | |
636b1ec8 | 402 | { |
2f854b82 FT |
403 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
404 | unsigned long deadline = jiffies + wait; | |
405 | unsigned long n; | |
406 | ||
407 | /* Busy-wait for up to 10 ms */ | |
408 | n = min(10000U, jiffies_to_usecs(wait)); | |
409 | n *= hostdata->accesses_per_ms; | |
b32ade12 | 410 | n /= 2000; |
2f854b82 | 411 | do { |
b32ade12 FT |
412 | if ((NCR5380_read(reg1) & bit1) == val1) |
413 | return 0; | |
414 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 FT |
415 | return 0; |
416 | cpu_relax(); | |
2f854b82 FT |
417 | } while (n--); |
418 | ||
419 | if (irqs_disabled() || in_interrupt()) | |
420 | return -ETIMEDOUT; | |
636b1ec8 | 421 | |
2f854b82 FT |
422 | /* Repeatedly sleep for 1 ms until deadline */ |
423 | while (time_is_after_jiffies(deadline)) { | |
424 | schedule_timeout_uninterruptible(1); | |
b32ade12 FT |
425 | if ((NCR5380_read(reg1) & bit1) == val1) |
426 | return 0; | |
427 | if ((NCR5380_read(reg2) & bit2) == val2) | |
636b1ec8 | 428 | return 0; |
636b1ec8 | 429 | } |
2f854b82 | 430 | |
636b1ec8 FT |
431 | return -ETIMEDOUT; |
432 | } | |
433 | ||
b32ade12 FT |
434 | static inline int NCR5380_poll_politely(struct Scsi_Host *instance, |
435 | int reg, int bit, int val, int wait) | |
436 | { | |
437 | return NCR5380_poll_politely2(instance, reg, bit, val, | |
438 | reg, bit, val, wait); | |
439 | } | |
440 | ||
1da177e4 LT |
441 | #if NDEBUG |
442 | static struct { | |
c28bda25 RZ |
443 | unsigned char mask; |
444 | const char *name; | |
445 | } signals[] = { | |
ac15c3bc FT |
446 | {SR_DBP, "PARITY"}, |
447 | {SR_RST, "RST"}, | |
448 | {SR_BSY, "BSY"}, | |
449 | {SR_REQ, "REQ"}, | |
450 | {SR_MSG, "MSG"}, | |
451 | {SR_CD, "CD"}, | |
452 | {SR_IO, "IO"}, | |
453 | {SR_SEL, "SEL"}, | |
c28bda25 | 454 | {0, NULL} |
ac15c3bc FT |
455 | }, |
456 | basrs[] = { | |
457 | {BASR_ATN, "ATN"}, | |
458 | {BASR_ACK, "ACK"}, | |
459 | {0, NULL} | |
460 | }, | |
461 | icrs[] = { | |
462 | {ICR_ASSERT_RST, "ASSERT RST"}, | |
463 | {ICR_ASSERT_ACK, "ASSERT ACK"}, | |
464 | {ICR_ASSERT_BSY, "ASSERT BSY"}, | |
465 | {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
466 | {ICR_ASSERT_ATN, "ASSERT ATN"}, | |
467 | {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
468 | {0, NULL} | |
469 | }, | |
470 | mrs[] = { | |
471 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, | |
472 | {MR_TARGET, "MODE TARGET"}, | |
473 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, | |
474 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, | |
475 | {MR_ENABLE_EOP_INTR, "MODE EOP INTR"}, | |
c28bda25 | 476 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
ac15c3bc FT |
477 | {MR_DMA_MODE, "MODE DMA"}, |
478 | {MR_ARBITRATE, "MODE ARBITRATION"}, | |
c28bda25 RZ |
479 | {0, NULL} |
480 | }; | |
1da177e4 | 481 | |
ff50f9ed FT |
482 | /** |
483 | * NCR5380_print - print scsi bus signals | |
484 | * @instance: adapter state to dump | |
1da177e4 | 485 | * |
ff50f9ed | 486 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
487 | */ |
488 | ||
c28bda25 RZ |
489 | static void NCR5380_print(struct Scsi_Host *instance) |
490 | { | |
491 | unsigned char status, data, basr, mr, icr, i; | |
c28bda25 | 492 | |
c28bda25 RZ |
493 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
494 | status = NCR5380_read(STATUS_REG); | |
495 | mr = NCR5380_read(MODE_REG); | |
496 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
497 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
11d2f63b | 498 | |
c28bda25 RZ |
499 | printk("STATUS_REG: %02x ", status); |
500 | for (i = 0; signals[i].mask; ++i) | |
501 | if (status & signals[i].mask) | |
502 | printk(",%s", signals[i].name); | |
503 | printk("\nBASR: %02x ", basr); | |
504 | for (i = 0; basrs[i].mask; ++i) | |
505 | if (basr & basrs[i].mask) | |
506 | printk(",%s", basrs[i].name); | |
507 | printk("\nICR: %02x ", icr); | |
508 | for (i = 0; icrs[i].mask; ++i) | |
509 | if (icr & icrs[i].mask) | |
510 | printk(",%s", icrs[i].name); | |
511 | printk("\nMODE: %02x ", mr); | |
512 | for (i = 0; mrs[i].mask; ++i) | |
513 | if (mr & mrs[i].mask) | |
514 | printk(",%s", mrs[i].name); | |
515 | printk("\n"); | |
1da177e4 LT |
516 | } |
517 | ||
518 | static struct { | |
c28bda25 RZ |
519 | unsigned char value; |
520 | const char *name; | |
1da177e4 | 521 | } phases[] = { |
ac15c3bc FT |
522 | {PHASE_DATAOUT, "DATAOUT"}, |
523 | {PHASE_DATAIN, "DATAIN"}, | |
524 | {PHASE_CMDOUT, "CMDOUT"}, | |
525 | {PHASE_STATIN, "STATIN"}, | |
526 | {PHASE_MSGOUT, "MSGOUT"}, | |
527 | {PHASE_MSGIN, "MSGIN"}, | |
c28bda25 RZ |
528 | {PHASE_UNKNOWN, "UNKNOWN"} |
529 | }; | |
1da177e4 | 530 | |
ff50f9ed FT |
531 | /** |
532 | * NCR5380_print_phase - show SCSI phase | |
533 | * @instance: adapter to dump | |
1da177e4 | 534 | * |
ff50f9ed | 535 | * Print the current SCSI phase for debugging purposes |
1da177e4 LT |
536 | */ |
537 | ||
538 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
539 | { | |
c28bda25 RZ |
540 | unsigned char status; |
541 | int i; | |
542 | ||
543 | status = NCR5380_read(STATUS_REG); | |
544 | if (!(status & SR_REQ)) | |
6a6ff4ac | 545 | shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); |
c28bda25 RZ |
546 | else { |
547 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
548 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
549 | ; | |
6a6ff4ac | 550 | shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); |
c28bda25 | 551 | } |
1da177e4 | 552 | } |
1da177e4 LT |
553 | #endif |
554 | ||
8c32513b FT |
555 | /** |
556 | * NCR58380_info - report driver and host information | |
557 | * @instance: relevant scsi host instance | |
1da177e4 | 558 | * |
8c32513b | 559 | * For use as the host template info() handler. |
1da177e4 LT |
560 | */ |
561 | ||
8c32513b | 562 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 563 | { |
8c32513b FT |
564 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
565 | ||
566 | return hostdata->info; | |
567 | } | |
568 | ||
569 | static void prepare_info(struct Scsi_Host *instance) | |
570 | { | |
571 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
572 | ||
573 | snprintf(hostdata->info, sizeof(hostdata->info), | |
574 | "%s, io_port 0x%lx, n_io_port %d, " | |
575 | "base 0x%lx, irq %d, " | |
576 | "can_queue %d, cmd_per_lun %d, " | |
577 | "sg_tablesize %d, this_id %d, " | |
9c3f0e2b | 578 | "flags { %s%s}, " |
8c32513b FT |
579 | "options { %s} ", |
580 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
581 | instance->base, instance->irq, | |
582 | instance->can_queue, instance->cmd_per_lun, | |
583 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 584 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
9c3f0e2b | 585 | hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", |
8c32513b FT |
586 | #ifdef DIFFERENTIAL |
587 | "DIFFERENTIAL " | |
588 | #endif | |
1da177e4 | 589 | #ifdef REAL_DMA |
8c32513b | 590 | "REAL_DMA " |
1da177e4 LT |
591 | #endif |
592 | #ifdef PARITY | |
8c32513b | 593 | "PARITY " |
1da177e4 LT |
594 | #endif |
595 | #ifdef SUPPORT_TAGS | |
8c32513b | 596 | "SUPPORT_TAGS " |
1da177e4 | 597 | #endif |
8c32513b | 598 | ""); |
1da177e4 LT |
599 | } |
600 | ||
ff50f9ed FT |
601 | /** |
602 | * NCR5380_init - initialise an NCR5380 | |
603 | * @instance: adapter to configure | |
604 | * @flags: control flags | |
1da177e4 | 605 | * |
ff50f9ed FT |
606 | * Initializes *instance and corresponding 5380 chip, |
607 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
608 | * |
609 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 610 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 611 | * |
ff50f9ed | 612 | * Returns 0 for success |
1da177e4 LT |
613 | */ |
614 | ||
95fde7a8 | 615 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 616 | { |
e8a60144 | 617 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 618 | int i; |
2f854b82 | 619 | unsigned long deadline; |
c28bda25 | 620 | |
a53a21e4 | 621 | hostdata->host = instance; |
c28bda25 RZ |
622 | hostdata->id_mask = 1 << instance->this_id; |
623 | hostdata->id_higher_mask = 0; | |
624 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
625 | if (i > hostdata->id_mask) | |
626 | hostdata->id_higher_mask |= i; | |
627 | for (i = 0; i < 8; ++i) | |
628 | hostdata->busy[i] = 0; | |
1da177e4 | 629 | #ifdef SUPPORT_TAGS |
ca513fc9 | 630 | init_tags(hostdata); |
1da177e4 LT |
631 | #endif |
632 | #if defined (REAL_DMA) | |
c28bda25 | 633 | hostdata->dma_len = 0; |
1da177e4 | 634 | #endif |
11d2f63b | 635 | spin_lock_init(&hostdata->lock); |
c28bda25 | 636 | hostdata->connected = NULL; |
f27db8eb FT |
637 | hostdata->sensing = NULL; |
638 | INIT_LIST_HEAD(&hostdata->autosense); | |
32b26a10 FT |
639 | INIT_LIST_HEAD(&hostdata->unissued); |
640 | INIT_LIST_HEAD(&hostdata->disconnected); | |
641 | ||
ef1081cb | 642 | hostdata->flags = flags; |
c28bda25 | 643 | |
a53a21e4 | 644 | INIT_WORK(&hostdata->main_task, NCR5380_main); |
0ad0eff9 FT |
645 | hostdata->work_q = alloc_workqueue("ncr5380_%d", |
646 | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
647 | 1, instance->host_no); | |
648 | if (!hostdata->work_q) | |
649 | return -ENOMEM; | |
1da177e4 | 650 | |
8c32513b FT |
651 | prepare_info(instance); |
652 | ||
c28bda25 RZ |
653 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
654 | NCR5380_write(MODE_REG, MR_BASE); | |
655 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
656 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 657 | |
2f854b82 FT |
658 | /* Calibrate register polling loop */ |
659 | i = 0; | |
660 | deadline = jiffies + 1; | |
661 | do { | |
662 | cpu_relax(); | |
663 | } while (time_is_after_jiffies(deadline)); | |
664 | deadline += msecs_to_jiffies(256); | |
665 | do { | |
666 | NCR5380_read(STATUS_REG); | |
667 | ++i; | |
668 | cpu_relax(); | |
669 | } while (time_is_after_jiffies(deadline)); | |
670 | hostdata->accesses_per_ms = i / 256; | |
671 | ||
c28bda25 | 672 | return 0; |
1da177e4 LT |
673 | } |
674 | ||
636b1ec8 FT |
675 | /** |
676 | * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. | |
677 | * @instance: adapter to check | |
678 | * | |
679 | * If the system crashed, it may have crashed with a connected target and | |
680 | * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the | |
681 | * currently established nexus, which we know nothing about. Failing that | |
682 | * do a bus reset. | |
683 | * | |
684 | * Note that a bus reset will cause the chip to assert IRQ. | |
685 | * | |
686 | * Returns 0 if successful, otherwise -ENXIO. | |
687 | */ | |
688 | ||
689 | static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) | |
690 | { | |
9c3f0e2b | 691 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
636b1ec8 FT |
692 | int pass; |
693 | ||
694 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { | |
695 | switch (pass) { | |
696 | case 1: | |
697 | case 3: | |
698 | case 5: | |
699 | shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); | |
700 | NCR5380_poll_politely(instance, | |
701 | STATUS_REG, SR_BSY, 0, 5 * HZ); | |
702 | break; | |
703 | case 2: | |
704 | shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); | |
705 | do_abort(instance); | |
706 | break; | |
707 | case 4: | |
708 | shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); | |
709 | do_reset(instance); | |
9c3f0e2b FT |
710 | /* Wait after a reset; the SCSI standard calls for |
711 | * 250ms, we wait 500ms to be on the safe side. | |
712 | * But some Toshiba CD-ROMs need ten times that. | |
713 | */ | |
714 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) | |
715 | msleep(2500); | |
716 | else | |
717 | msleep(500); | |
636b1ec8 FT |
718 | break; |
719 | case 6: | |
720 | shost_printk(KERN_ERR, instance, "bus locked solid\n"); | |
721 | return -ENXIO; | |
722 | } | |
723 | } | |
724 | return 0; | |
725 | } | |
726 | ||
ff50f9ed FT |
727 | /** |
728 | * NCR5380_exit - remove an NCR5380 | |
729 | * @instance: adapter to remove | |
730 | * | |
731 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
732 | */ | |
733 | ||
6323e4fe GU |
734 | static void NCR5380_exit(struct Scsi_Host *instance) |
735 | { | |
a53a21e4 FT |
736 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
737 | ||
738 | cancel_work_sync(&hostdata->main_task); | |
0ad0eff9 | 739 | destroy_workqueue(hostdata->work_q); |
6323e4fe GU |
740 | } |
741 | ||
677e0194 FT |
742 | /** |
743 | * complete_cmd - finish processing a command and return it to the SCSI ML | |
744 | * @instance: the host instance | |
745 | * @cmd: command to complete | |
746 | */ | |
747 | ||
748 | static void complete_cmd(struct Scsi_Host *instance, | |
749 | struct scsi_cmnd *cmd) | |
750 | { | |
751 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
752 | ||
753 | dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); | |
754 | ||
f27db8eb FT |
755 | if (hostdata->sensing == cmd) { |
756 | /* Autosense processing ends here */ | |
757 | if ((cmd->result & 0xff) != SAM_STAT_GOOD) { | |
758 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
759 | set_host_byte(cmd, DID_ERROR); | |
760 | } else | |
761 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
762 | hostdata->sensing = NULL; | |
763 | } | |
764 | ||
677e0194 FT |
765 | #ifdef SUPPORT_TAGS |
766 | cmd_free_tag(cmd); | |
767 | #else | |
768 | hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); | |
769 | #endif | |
770 | cmd->scsi_done(cmd); | |
771 | } | |
772 | ||
ff50f9ed FT |
773 | /** |
774 | * NCR5380_queue_command - queue a command | |
775 | * @instance: the relevant SCSI adapter | |
776 | * @cmd: SCSI command | |
1da177e4 | 777 | * |
1bb40589 | 778 | * cmd is added to the per-instance issue queue, with minor |
ff50f9ed FT |
779 | * twiddling done to the host specific fields of cmd. If the |
780 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
781 | */ |
782 | ||
16b29e75 FT |
783 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
784 | struct scsi_cmnd *cmd) | |
1da177e4 | 785 | { |
16b29e75 | 786 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
32b26a10 | 787 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
c28bda25 | 788 | unsigned long flags; |
1da177e4 LT |
789 | |
790 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
791 | switch (cmd->cmnd[0]) { |
792 | case WRITE_6: | |
793 | case WRITE_10: | |
dbb6b350 | 794 | shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
c28bda25 | 795 | cmd->result = (DID_ERROR << 16); |
16b29e75 | 796 | cmd->scsi_done(cmd); |
c28bda25 RZ |
797 | return 0; |
798 | } | |
1da177e4 LT |
799 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
800 | ||
c28bda25 RZ |
801 | cmd->result = 0; |
802 | ||
803 | /* | |
c28bda25 RZ |
804 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
805 | * because also a timer int can trigger an abort or reset, which would | |
806 | * alter queues and touch the lock. | |
807 | */ | |
e3c3da67 | 808 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
809 | return SCSI_MLQUEUE_HOST_BUSY; |
810 | ||
11d2f63b | 811 | spin_lock_irqsave(&hostdata->lock, flags); |
16b29e75 | 812 | |
ff50f9ed FT |
813 | /* |
814 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
815 | * commands are added to the head of the queue since any command will | |
816 | * clear the contingent allegiance condition that exists and the | |
817 | * sense data is only guaranteed to be valid while the condition exists. | |
818 | */ | |
819 | ||
32b26a10 FT |
820 | if (cmd->cmnd[0] == REQUEST_SENSE) |
821 | list_add(&ncmd->list, &hostdata->unissued); | |
822 | else | |
823 | list_add_tail(&ncmd->list, &hostdata->unissued); | |
824 | ||
11d2f63b | 825 | spin_unlock_irqrestore(&hostdata->lock, flags); |
c28bda25 | 826 | |
dbb6b350 FT |
827 | dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
828 | cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); | |
c28bda25 | 829 | |
010e89d1 FT |
830 | /* Kick off command processing */ |
831 | queue_work(hostdata->work_q, &hostdata->main_task); | |
c28bda25 | 832 | return 0; |
1da177e4 LT |
833 | } |
834 | ||
e3c3da67 FT |
835 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
836 | { | |
837 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
838 | ||
839 | /* Caller does the locking needed to set & test these data atomically */ | |
32b26a10 FT |
840 | if (list_empty(&hostdata->disconnected) && |
841 | list_empty(&hostdata->unissued) && | |
f27db8eb | 842 | list_empty(&hostdata->autosense) && |
e3c3da67 | 843 | !hostdata->connected && |
707d62b3 | 844 | !hostdata->selecting) |
e3c3da67 FT |
845 | NCR5380_release_dma_irq(instance); |
846 | } | |
847 | ||
f27db8eb FT |
848 | /** |
849 | * dequeue_next_cmd - dequeue a command for processing | |
850 | * @instance: the scsi host instance | |
851 | * | |
852 | * Priority is given to commands on the autosense queue. These commands | |
853 | * need autosense because of a CHECK CONDITION result. | |
854 | * | |
855 | * Returns a command pointer if a command is found for a target that is | |
856 | * not already busy. Otherwise returns NULL. | |
857 | */ | |
858 | ||
859 | static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) | |
860 | { | |
861 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
862 | struct NCR5380_cmd *ncmd; | |
863 | struct scsi_cmnd *cmd; | |
864 | ||
8d5dbec3 | 865 | if (hostdata->sensing || list_empty(&hostdata->autosense)) { |
f27db8eb FT |
866 | list_for_each_entry(ncmd, &hostdata->unissued, list) { |
867 | cmd = NCR5380_to_scmd(ncmd); | |
868 | dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", | |
869 | cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); | |
870 | ||
871 | if ( | |
872 | #ifdef SUPPORT_TAGS | |
873 | !is_lun_busy(cmd, 1) | |
874 | #else | |
875 | !(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun)) | |
876 | #endif | |
877 | ) { | |
878 | list_del(&ncmd->list); | |
879 | dsprintk(NDEBUG_QUEUES, instance, | |
880 | "dequeue: removed %p from issue queue\n", cmd); | |
881 | return cmd; | |
882 | } | |
883 | } | |
884 | } else { | |
885 | /* Autosense processing begins here */ | |
886 | ncmd = list_first_entry(&hostdata->autosense, | |
887 | struct NCR5380_cmd, list); | |
888 | list_del(&ncmd->list); | |
889 | cmd = NCR5380_to_scmd(ncmd); | |
890 | dsprintk(NDEBUG_QUEUES, instance, | |
891 | "dequeue: removed %p from autosense queue\n", cmd); | |
892 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); | |
893 | hostdata->sensing = cmd; | |
894 | return cmd; | |
895 | } | |
896 | return NULL; | |
897 | } | |
898 | ||
899 | static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) | |
900 | { | |
901 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
902 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); | |
903 | ||
8d5dbec3 | 904 | if (hostdata->sensing == cmd) { |
f27db8eb FT |
905 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
906 | list_add(&ncmd->list, &hostdata->autosense); | |
907 | hostdata->sensing = NULL; | |
908 | } else | |
909 | list_add(&ncmd->list, &hostdata->unissued); | |
910 | } | |
911 | ||
ff50f9ed FT |
912 | /** |
913 | * NCR5380_main - NCR state machines | |
1da177e4 | 914 | * |
ff50f9ed FT |
915 | * NCR5380_main is a coroutine that runs as long as more work can |
916 | * be done on the NCR5380 host adapters in a system. Both | |
917 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
918 | * in case it is not running. | |
c28bda25 RZ |
919 | */ |
920 | ||
b312b38c | 921 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 922 | { |
a53a21e4 FT |
923 | struct NCR5380_hostdata *hostdata = |
924 | container_of(work, struct NCR5380_hostdata, main_task); | |
925 | struct Scsi_Host *instance = hostdata->host; | |
c28bda25 | 926 | int done; |
c28bda25 RZ |
927 | |
928 | /* | |
c28bda25 RZ |
929 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
930 | * because also a timer int can trigger an abort or reset, which can | |
931 | * alter queues and touch the Falcon lock. | |
932 | */ | |
933 | ||
c28bda25 | 934 | do { |
c28bda25 RZ |
935 | done = 1; |
936 | ||
0a4e3612 | 937 | spin_lock_irq(&hostdata->lock); |
ccf6efd7 FT |
938 | while (!hostdata->connected && !hostdata->selecting) { |
939 | struct scsi_cmnd *cmd = dequeue_next_cmd(instance); | |
940 | ||
941 | if (!cmd) | |
942 | break; | |
0d3d9a42 | 943 | |
f27db8eb | 944 | dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); |
c28bda25 | 945 | |
f27db8eb FT |
946 | /* |
947 | * Attempt to establish an I_T_L nexus here. | |
948 | * On success, instance->hostdata->connected is set. | |
949 | * On failure, we must add the command back to the | |
950 | * issue queue so we can keep trying. | |
951 | */ | |
952 | /* | |
953 | * REQUEST SENSE commands are issued without tagged | |
954 | * queueing, even on SCSI-II devices because the | |
955 | * contingent allegiance condition exists for the | |
956 | * entire unit. | |
957 | */ | |
958 | /* ++roman: ...and the standard also requires that | |
959 | * REQUEST SENSE command are untagged. | |
960 | */ | |
c28bda25 | 961 | |
1da177e4 | 962 | #ifdef SUPPORT_TAGS |
f27db8eb | 963 | cmd_get_tag(cmd, cmd->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 964 | #endif |
ccf6efd7 | 965 | if (!NCR5380_select(instance, cmd)) { |
707d62b3 | 966 | dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); |
f27db8eb FT |
967 | maybe_release_dma_irq(instance); |
968 | } else { | |
f27db8eb FT |
969 | dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, |
970 | "main: select failed, returning %p to queue\n", cmd); | |
971 | requeue_cmd(instance, cmd); | |
1da177e4 | 972 | #ifdef SUPPORT_TAGS |
f27db8eb | 973 | cmd_free_tag(cmd); |
1da177e4 | 974 | #endif |
f27db8eb FT |
975 | } |
976 | } | |
c28bda25 | 977 | if (hostdata->connected |
1da177e4 | 978 | #ifdef REAL_DMA |
c28bda25 | 979 | && !hostdata->dma_len |
1da177e4 | 980 | #endif |
c28bda25 | 981 | ) { |
b746545f | 982 | dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n"); |
c28bda25 | 983 | NCR5380_information_transfer(instance); |
c28bda25 RZ |
984 | done = 0; |
985 | } | |
0a4e3612 FT |
986 | spin_unlock_irq(&hostdata->lock); |
987 | if (!done) | |
988 | cond_resched(); | |
c28bda25 | 989 | } while (!done); |
1da177e4 LT |
990 | } |
991 | ||
992 | ||
993 | #ifdef REAL_DMA | |
994 | /* | |
995 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
996 | * | |
997 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
594d4ba3 | 998 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
999 | * |
1000 | * Inputs : instance - this instance of the NCR5380. | |
1da177e4 LT |
1001 | */ |
1002 | ||
c28bda25 | 1003 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1004 | { |
e8a60144 | 1005 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
01bd9081 | 1006 | int transferred; |
e3f463b0 | 1007 | unsigned char **data; |
5299b3ca | 1008 | int *count; |
e3f463b0 FT |
1009 | int saved_data = 0, overrun = 0; |
1010 | unsigned char p; | |
c28bda25 | 1011 | |
ef1081cb | 1012 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1013 | p = hostdata->connected->SCp.phase; |
1014 | if (p & SR_IO) { | |
1015 | udelay(10); | |
1016 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1017 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1018 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1019 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1020 | overrun = 1; | |
b746545f | 1021 | dsprintk(NDEBUG_DMA, instance, "read overrun handled\n"); |
c28bda25 RZ |
1022 | } |
1023 | } | |
1024 | } | |
1025 | ||
e3f463b0 FT |
1026 | #if defined(CONFIG_SUN3) |
1027 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1028 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1029 | instance->host_no); | |
1030 | BUG(); | |
1031 | } | |
1032 | ||
1033 | /* make sure we're not stuck in a data phase */ | |
1034 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1035 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1036 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1037 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1038 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1039 | instance->host_no); | |
1040 | BUG(); | |
1041 | } | |
1042 | #endif | |
1043 | ||
c28bda25 RZ |
1044 | NCR5380_write(MODE_REG, MR_BASE); |
1045 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
cd400825 | 1046 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
c28bda25 | 1047 | |
01bd9081 | 1048 | transferred = hostdata->dma_len - NCR5380_dma_residual(instance); |
c28bda25 RZ |
1049 | hostdata->dma_len = 0; |
1050 | ||
1051 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1052 | count = &hostdata->connected->SCp.this_residual; | |
01bd9081 FT |
1053 | *data += transferred; |
1054 | *count -= transferred; | |
c28bda25 | 1055 | |
ef1081cb | 1056 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1057 | int cnt, toPIO; |
1058 | ||
c28bda25 | 1059 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1060 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1061 | if (overrun) { |
d65e634a | 1062 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1063 | *(*data)++ = saved_data; |
1064 | (*count)--; | |
1065 | cnt--; | |
1066 | toPIO--; | |
1067 | } | |
d65e634a | 1068 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1069 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1070 | *count -= toPIO - cnt; | |
1071 | } | |
1da177e4 | 1072 | } |
1da177e4 LT |
1073 | } |
1074 | #endif /* REAL_DMA */ | |
1075 | ||
1076 | ||
ff50f9ed FT |
1077 | /** |
1078 | * NCR5380_intr - generic NCR5380 irq handler | |
1079 | * @irq: interrupt number | |
1080 | * @dev_id: device info | |
1da177e4 | 1081 | * |
ff50f9ed FT |
1082 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1083 | * from the disconnected queue, and restarting NCR5380_main() | |
1084 | * as required. | |
cd400825 FT |
1085 | * |
1086 | * The chip can assert IRQ in any of six different conditions. The IRQ flag | |
1087 | * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). | |
1088 | * Three of these six conditions are latched in the Bus and Status Register: | |
1089 | * - End of DMA (cleared by ending DMA Mode) | |
1090 | * - Parity error (cleared by reading RPIR) | |
1091 | * - Loss of BSY (cleared by reading RPIR) | |
1092 | * Two conditions have flag bits that are not latched: | |
1093 | * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) | |
1094 | * - Bus reset (non-maskable) | |
1095 | * The remaining condition has no flag bit at all: | |
1096 | * - Selection/reselection | |
1097 | * | |
1098 | * Hence, establishing the cause(s) of any interrupt is partly guesswork. | |
1099 | * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor | |
1100 | * claimed that "the design of the [DP8490] interrupt logic ensures | |
1101 | * interrupts will not be lost (they can be on the DP5380)." | |
1102 | * The L5380/53C80 datasheet from LOGIC Devices has more details. | |
1103 | * | |
1104 | * Checking for bus reset by reading RST is futile because of interrupt | |
1105 | * latency, but a bus reset will reset chip logic. Checking for parity error | |
1106 | * is unnecessary because that interrupt is never enabled. A Loss of BSY | |
1107 | * condition will clear DMA Mode. We can tell when this occurs because the | |
1108 | * the Busy Monitor interrupt is enabled together with DMA Mode. | |
1da177e4 LT |
1109 | */ |
1110 | ||
c28bda25 | 1111 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1112 | { |
a53a21e4 | 1113 | struct Scsi_Host *instance = dev_id; |
010e89d1 | 1114 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
cd400825 | 1115 | int handled = 0; |
c28bda25 | 1116 | unsigned char basr; |
11d2f63b FT |
1117 | unsigned long flags; |
1118 | ||
1119 | spin_lock_irqsave(&hostdata->lock, flags); | |
c28bda25 | 1120 | |
c28bda25 | 1121 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
c28bda25 | 1122 | if (basr & BASR_IRQ) { |
cd400825 FT |
1123 | unsigned char mr = NCR5380_read(MODE_REG); |
1124 | unsigned char sr = NCR5380_read(STATUS_REG); | |
1125 | ||
b746545f FT |
1126 | dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", |
1127 | irq, basr, sr, mr); | |
1da177e4 LT |
1128 | |
1129 | #if defined(REAL_DMA) | |
cd400825 FT |
1130 | if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
1131 | /* Probably End of DMA, Phase Mismatch or Loss of BSY. | |
1132 | * We ack IRQ after clearing Mode Register. Workarounds | |
1133 | * for End of DMA errata need to happen in DMA Mode. | |
c28bda25 RZ |
1134 | */ |
1135 | ||
b746545f | 1136 | dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n"); |
c28bda25 | 1137 | |
cd400825 FT |
1138 | if (hostdata->connected) { |
1139 | NCR5380_dma_complete(instance); | |
1140 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1141 | } else { | |
1142 | NCR5380_write(MODE_REG, MR_BASE); | |
1143 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1144 | } | |
1145 | } else | |
1da177e4 | 1146 | #endif /* REAL_DMA */ |
cd400825 FT |
1147 | if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
1148 | (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { | |
1149 | /* Probably reselected */ | |
1150 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1151 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1152 | ||
b746545f | 1153 | dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n"); |
cd400825 FT |
1154 | |
1155 | if (!hostdata->connected) { | |
1156 | NCR5380_reselect(instance); | |
1157 | queue_work(hostdata->work_q, &hostdata->main_task); | |
1158 | } | |
1159 | if (!hostdata->connected) | |
1160 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1161 | } else { | |
1162 | /* Probably Bus Reset */ | |
1163 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1164 | ||
b746545f | 1165 | dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n"); |
e3f463b0 | 1166 | #ifdef SUN3_SCSI_VME |
cd400825 | 1167 | dregs->csr |= CSR_DMA_ENABLE; |
e3f463b0 | 1168 | #endif |
cd400825 | 1169 | } |
c28bda25 | 1170 | handled = 1; |
cd400825 FT |
1171 | } else { |
1172 | shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); | |
e3f463b0 FT |
1173 | #ifdef SUN3_SCSI_VME |
1174 | dregs->csr |= CSR_DMA_ENABLE; | |
1175 | #endif | |
c28bda25 RZ |
1176 | } |
1177 | ||
11d2f63b FT |
1178 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1179 | ||
c28bda25 | 1180 | return IRQ_RETVAL(handled); |
1da177e4 LT |
1181 | } |
1182 | ||
c28bda25 | 1183 | /* |
710ddd0d | 1184 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
594d4ba3 | 1185 | * struct scsi_cmnd *cmd) |
1da177e4 LT |
1186 | * |
1187 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
594d4ba3 FT |
1188 | * including ARBITRATION, SELECTION, and initial message out for |
1189 | * IDENTIFY and queue messages. | |
1da177e4 | 1190 | * |
c28bda25 | 1191 | * Inputs : instance - instantiation of the 5380 driver on which this |
594d4ba3 | 1192 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1193 | * |
707d62b3 FT |
1194 | * Returns cmd if selection failed but should be retried, |
1195 | * NULL if selection failed and should not be retried, or | |
1196 | * NULL if selection succeeded (hostdata->connected == cmd). | |
1da177e4 | 1197 | * |
c28bda25 | 1198 | * Side effects : |
594d4ba3 FT |
1199 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
1200 | * with registers as they should have been on entry - ie | |
1201 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1202 | * will cease to drive any SCSI bus signals. | |
1da177e4 | 1203 | * |
594d4ba3 FT |
1204 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1205 | * instance->connected will be set to cmd. | |
1206 | * SELECT interrupt will be disabled. | |
1da177e4 | 1207 | * |
594d4ba3 FT |
1208 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1209 | * cmd->result host byte set to DID_BAD_TARGET. | |
1da177e4 LT |
1210 | */ |
1211 | ||
707d62b3 FT |
1212 | static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, |
1213 | struct scsi_cmnd *cmd) | |
1da177e4 | 1214 | { |
e8a60144 | 1215 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1216 | unsigned char tmp[3], phase; |
1217 | unsigned char *data; | |
1218 | int len; | |
ae753a33 | 1219 | int err; |
c28bda25 | 1220 | |
8ad3a593 | 1221 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
b746545f FT |
1222 | dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", |
1223 | instance->this_id); | |
c28bda25 | 1224 | |
707d62b3 FT |
1225 | /* |
1226 | * Arbitration and selection phases are slow and involve dropping the | |
1227 | * lock, so we have to watch out for EH. An exception handler may | |
1228 | * change 'selecting' to NULL. This function will then return NULL | |
1229 | * so that the caller will forget about 'cmd'. (During information | |
1230 | * transfer phases, EH may change 'connected' to NULL.) | |
1231 | */ | |
1232 | hostdata->selecting = cmd; | |
1233 | ||
c28bda25 RZ |
1234 | /* |
1235 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1236 | * data bus during SELECTION. | |
1237 | */ | |
1238 | ||
c28bda25 | 1239 | NCR5380_write(TARGET_COMMAND_REG, 0); |
1da177e4 | 1240 | |
c28bda25 RZ |
1241 | /* |
1242 | * Start arbitration. | |
1243 | */ | |
1da177e4 | 1244 | |
c28bda25 RZ |
1245 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1246 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1247 | |
55500d9b FT |
1248 | /* The chip now waits for BUS FREE phase. Then after the 800 ns |
1249 | * Bus Free Delay, arbitration will begin. | |
1250 | */ | |
c28bda25 | 1251 | |
11d2f63b | 1252 | spin_unlock_irq(&hostdata->lock); |
b32ade12 FT |
1253 | err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, |
1254 | INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, | |
1255 | ICR_ARBITRATION_PROGRESS, HZ); | |
11d2f63b | 1256 | spin_lock_irq(&hostdata->lock); |
b32ade12 FT |
1257 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
1258 | /* Reselection interrupt */ | |
707d62b3 | 1259 | goto out; |
b32ade12 | 1260 | } |
ccf6efd7 FT |
1261 | if (!hostdata->selecting) { |
1262 | /* Command was aborted */ | |
1263 | NCR5380_write(MODE_REG, MR_BASE); | |
1264 | goto out; | |
1265 | } | |
b32ade12 FT |
1266 | if (err < 0) { |
1267 | NCR5380_write(MODE_REG, MR_BASE); | |
1268 | shost_printk(KERN_ERR, instance, | |
1269 | "select: arbitration timeout\n"); | |
707d62b3 | 1270 | goto out; |
c28bda25 | 1271 | } |
11d2f63b | 1272 | spin_unlock_irq(&hostdata->lock); |
c28bda25 | 1273 | |
55500d9b | 1274 | /* The SCSI-2 arbitration delay is 2.4 us */ |
c28bda25 RZ |
1275 | udelay(3); |
1276 | ||
1277 | /* Check for lost arbitration */ | |
1278 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1279 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
11d2f63b | 1280 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
c28bda25 | 1281 | NCR5380_write(MODE_REG, MR_BASE); |
b746545f | 1282 | dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n"); |
11d2f63b | 1283 | spin_lock_irq(&hostdata->lock); |
707d62b3 | 1284 | goto out; |
c28bda25 | 1285 | } |
1da177e4 | 1286 | |
cf13b083 FT |
1287 | /* After/during arbitration, BSY should be asserted. |
1288 | * IBM DPES-31080 Version S31Q works now | |
1289 | * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) | |
1290 | */ | |
c28bda25 RZ |
1291 | NCR5380_write(INITIATOR_COMMAND_REG, |
1292 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1293 | ||
c28bda25 RZ |
1294 | /* |
1295 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1296 | * a minimum so we'll udelay ceil(1.2) | |
1297 | */ | |
1da177e4 | 1298 | |
9c3f0e2b FT |
1299 | if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
1300 | udelay(15); | |
1301 | else | |
1302 | udelay(2); | |
c28bda25 | 1303 | |
11d2f63b FT |
1304 | spin_lock_irq(&hostdata->lock); |
1305 | ||
72064a78 FT |
1306 | /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
1307 | if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) | |
707d62b3 FT |
1308 | goto out; |
1309 | ||
1310 | if (!hostdata->selecting) { | |
1311 | NCR5380_write(MODE_REG, MR_BASE); | |
1312 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1313 | goto out; | |
1314 | } | |
c28bda25 | 1315 | |
b746545f | 1316 | dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); |
c28bda25 RZ |
1317 | |
1318 | /* | |
1319 | * Now that we have won arbitration, start Selection process, asserting | |
1320 | * the host and target ID's on the SCSI bus. | |
1321 | */ | |
1322 | ||
3d07d22b | 1323 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd))); |
c28bda25 RZ |
1324 | |
1325 | /* | |
1326 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1327 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1328 | * phase immediately after selection. | |
1329 | */ | |
1330 | ||
3d07d22b FT |
1331 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY | |
1332 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL); | |
1da177e4 | 1333 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1334 | |
c28bda25 RZ |
1335 | /* |
1336 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1337 | * otherwise we will trigger an interrupt. | |
1338 | */ | |
c28bda25 | 1339 | NCR5380_write(SELECT_ENABLE_REG, 0); |
1da177e4 | 1340 | |
11d2f63b FT |
1341 | spin_unlock_irq(&hostdata->lock); |
1342 | ||
c28bda25 RZ |
1343 | /* |
1344 | * The initiator shall then wait at least two deskew delays and release | |
1345 | * the BSY signal. | |
1346 | */ | |
1347 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1348 | ||
1349 | /* Reset BSY */ | |
3d07d22b FT |
1350 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | |
1351 | ICR_ASSERT_ATN | ICR_ASSERT_SEL); | |
c28bda25 RZ |
1352 | |
1353 | /* | |
1354 | * Something weird happens when we cease to drive BSY - looks | |
1355 | * like the board/chip is letting us do another read before the | |
1356 | * appropriate propagation delay has expired, and we're confusing | |
1357 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1358 | * | |
1359 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1360 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1361 | * tighter 'C' code breaks and requires this) solves the problem - | |
1362 | * the 1 us delay is arbitrary, and only used because this delay will | |
1363 | * be the same on other platforms and since it works here, it should | |
1364 | * work there. | |
1365 | * | |
1366 | * wingel suggests that this could be due to failing to wait | |
1367 | * one deskew delay. | |
1368 | */ | |
1da177e4 | 1369 | |
c28bda25 | 1370 | udelay(1); |
1da177e4 | 1371 | |
b746545f | 1372 | dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd)); |
1da177e4 | 1373 | |
c28bda25 RZ |
1374 | /* |
1375 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1376 | * selection. | |
1377 | */ | |
1da177e4 | 1378 | |
ae753a33 FT |
1379 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, |
1380 | msecs_to_jiffies(250)); | |
c28bda25 RZ |
1381 | |
1382 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
11d2f63b | 1383 | spin_lock_irq(&hostdata->lock); |
c28bda25 RZ |
1384 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
1385 | NCR5380_reselect(instance); | |
cd400825 FT |
1386 | if (!hostdata->connected) |
1387 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
6a6ff4ac | 1388 | shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n"); |
707d62b3 | 1389 | goto out; |
c28bda25 | 1390 | } |
1da177e4 | 1391 | |
ae753a33 | 1392 | if (err < 0) { |
11d2f63b | 1393 | spin_lock_irq(&hostdata->lock); |
c28bda25 | 1394 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
c28bda25 | 1395 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
707d62b3 FT |
1396 | /* Can't touch cmd if it has been reclaimed by the scsi ML */ |
1397 | if (hostdata->selecting) { | |
1398 | cmd->result = DID_BAD_TARGET << 16; | |
1399 | complete_cmd(instance, cmd); | |
1400 | dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n"); | |
1401 | cmd = NULL; | |
1402 | } | |
1403 | goto out; | |
c28bda25 RZ |
1404 | } |
1405 | ||
ae753a33 FT |
1406 | /* |
1407 | * No less than two deskew delays after the initiator detects the | |
1408 | * BSY signal is true, it shall release the SEL signal and may | |
1409 | * change the DATA BUS. -wingel | |
1410 | */ | |
1411 | ||
1412 | udelay(1); | |
1413 | ||
1414 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1415 | ||
c28bda25 RZ |
1416 | /* |
1417 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1418 | * was true but before BSY was false during selection, the information | |
1419 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1420 | * IDENTIFY message. | |
1421 | * | |
1422 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1423 | * message (2 bytes) with a tag ID that we increment with every command | |
1424 | * until it wraps back to 0. | |
1425 | * | |
1426 | * XXX - it turns out that there are some broken SCSI-II devices, | |
594d4ba3 FT |
1427 | * which claim to support tagged queuing but fail when more than |
1428 | * some number of commands are issued at once. | |
c28bda25 RZ |
1429 | */ |
1430 | ||
1431 | /* Wait for start of REQ/ACK handshake */ | |
55500d9b FT |
1432 | |
1433 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); | |
11d2f63b | 1434 | spin_lock_irq(&hostdata->lock); |
55500d9b FT |
1435 | if (err < 0) { |
1436 | shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); | |
1437 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1438 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
707d62b3 FT |
1439 | goto out; |
1440 | } | |
1441 | if (!hostdata->selecting) { | |
1442 | do_abort(instance); | |
1443 | goto out; | |
55500d9b | 1444 | } |
c28bda25 | 1445 | |
b746545f FT |
1446 | dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", |
1447 | scmd_id(cmd)); | |
c28bda25 | 1448 | tmp[0] = IDENTIFY(1, cmd->device->lun); |
1da177e4 LT |
1449 | |
1450 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1451 | if (cmd->tag != TAG_NONE) { |
1452 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1453 | tmp[2] = cmd->tag; | |
1454 | len = 3; | |
1455 | } else | |
1456 | len = 1; | |
1da177e4 | 1457 | #else |
c28bda25 RZ |
1458 | len = 1; |
1459 | cmd->tag = 0; | |
1da177e4 LT |
1460 | #endif /* SUPPORT_TAGS */ |
1461 | ||
c28bda25 RZ |
1462 | /* Send message(s) */ |
1463 | data = tmp; | |
1464 | phase = PHASE_MSGOUT; | |
1465 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f | 1466 | dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n"); |
c28bda25 | 1467 | /* XXX need to handle errors here */ |
11d2f63b | 1468 | |
c28bda25 | 1469 | hostdata->connected = cmd; |
1da177e4 | 1470 | #ifndef SUPPORT_TAGS |
3d07d22b | 1471 | hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun; |
c28bda25 | 1472 | #endif |
e3f463b0 FT |
1473 | #ifdef SUN3_SCSI_VME |
1474 | dregs->csr |= CSR_INTR; | |
1475 | #endif | |
1da177e4 | 1476 | |
c28bda25 | 1477 | initialize_SCp(cmd); |
1da177e4 | 1478 | |
707d62b3 FT |
1479 | cmd = NULL; |
1480 | ||
1481 | out: | |
1482 | if (!hostdata->selecting) | |
1483 | return NULL; | |
1484 | hostdata->selecting = NULL; | |
1485 | return cmd; | |
1da177e4 LT |
1486 | } |
1487 | ||
c28bda25 RZ |
1488 | /* |
1489 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
594d4ba3 | 1490 | * unsigned char *phase, int *count, unsigned char **data) |
1da177e4 LT |
1491 | * |
1492 | * Purpose : transfers data in given phase using polled I/O | |
1493 | * | |
c28bda25 | 1494 | * Inputs : instance - instance of driver, *phase - pointer to |
594d4ba3 FT |
1495 | * what phase is expected, *count - pointer to number of |
1496 | * bytes to transfer, **data - pointer to data pointer. | |
c28bda25 | 1497 | * |
1da177e4 | 1498 | * Returns : -1 when different phase is entered without transferring |
594d4ba3 FT |
1499 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1500 | * is in same phase. | |
1da177e4 | 1501 | * |
594d4ba3 | 1502 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1503 | * |
1504 | * XXX Note : handling for bus free may be useful. | |
1505 | */ | |
1506 | ||
1507 | /* | |
c28bda25 | 1508 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1509 | * IS 100% reliable, and for the actual data transfer where speed |
1510 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1511 | */ | |
1512 | ||
c28bda25 RZ |
1513 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1514 | unsigned char *phase, int *count, | |
1515 | unsigned char **data) | |
1da177e4 | 1516 | { |
ac15c3bc FT |
1517 | unsigned char p = *phase, tmp; |
1518 | int c = *count; | |
1519 | unsigned char *d = *data; | |
c28bda25 RZ |
1520 | |
1521 | /* | |
1522 | * The NCR5380 chip will only drive the SCSI bus when the | |
1523 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1524 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1525 | */ |
1da177e4 | 1526 | |
c28bda25 | 1527 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1528 | |
c28bda25 RZ |
1529 | do { |
1530 | /* | |
1531 | * Wait for assertion of REQ, after which the phase bits will be | |
1532 | * valid | |
1533 | */ | |
686f3990 FT |
1534 | |
1535 | if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) | |
1536 | break; | |
1da177e4 | 1537 | |
b746545f | 1538 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n"); |
1da177e4 | 1539 | |
c28bda25 | 1540 | /* Check for phase mismatch */ |
686f3990 | 1541 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
b746545f | 1542 | dsprintk(NDEBUG_PIO, instance, "phase mismatch\n"); |
8ad3a593 | 1543 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1544 | break; |
1545 | } | |
1da177e4 | 1546 | |
c28bda25 RZ |
1547 | /* Do actual transfer from SCSI bus to / from memory */ |
1548 | if (!(p & SR_IO)) | |
1549 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1550 | else | |
1551 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1552 | |
c28bda25 | 1553 | ++d; |
1da177e4 | 1554 | |
c28bda25 RZ |
1555 | /* |
1556 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1557 | * should drop ATN on the last byte of the message phase | |
1558 | * after REQ has been asserted for the handshake but before | |
1559 | * the initiator raises ACK. | |
1560 | */ | |
1da177e4 | 1561 | |
c28bda25 RZ |
1562 | if (!(p & SR_IO)) { |
1563 | if (!((p & SR_MSG) && c > 1)) { | |
1564 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1565 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 | 1566 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
3d07d22b | 1567 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
c28bda25 RZ |
1568 | } else { |
1569 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
3d07d22b | 1570 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
8ad3a593 | 1571 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 | 1572 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
3d07d22b | 1573 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
c28bda25 RZ |
1574 | } |
1575 | } else { | |
8ad3a593 | 1576 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1577 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1578 | } | |
1da177e4 | 1579 | |
a2edc4a6 FT |
1580 | if (NCR5380_poll_politely(instance, |
1581 | STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) | |
1582 | break; | |
c28bda25 | 1583 | |
b746545f | 1584 | dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n"); |
c28bda25 | 1585 | |
ac15c3bc FT |
1586 | /* |
1587 | * We have several special cases to consider during REQ/ACK handshaking : | |
1588 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1589 | * message. ATN must be dropped as ACK is dropped. | |
1590 | * | |
1591 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1592 | * message. We must exit with ACK asserted, so that the calling | |
1593 | * code may raise ATN before dropping ACK to reject the message. | |
1594 | * | |
1595 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1596 | */ | |
c28bda25 RZ |
1597 | if (!(p == PHASE_MSGIN && c == 1)) { |
1598 | if (p == PHASE_MSGOUT && c > 1) | |
1599 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1600 | else | |
1601 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1602 | } | |
1603 | } while (--c); | |
1604 | ||
b746545f | 1605 | dsprintk(NDEBUG_PIO, instance, "residual %d\n", c); |
c28bda25 RZ |
1606 | |
1607 | *count = c; | |
1608 | *data = d; | |
1609 | tmp = NCR5380_read(STATUS_REG); | |
1610 | /* The phase read from the bus is valid if either REQ is (already) | |
a2edc4a6 FT |
1611 | * asserted or if ACK hasn't been released yet. The latter applies if |
1612 | * we're in MSG IN, DATA IN or STATUS and all bytes have been received. | |
c28bda25 | 1613 | */ |
a2edc4a6 | 1614 | if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
c28bda25 RZ |
1615 | *phase = tmp & PHASE_MASK; |
1616 | else | |
1617 | *phase = PHASE_UNKNOWN; | |
1618 | ||
1619 | if (!c || (*phase == p)) | |
1620 | return 0; | |
1621 | else | |
1622 | return -1; | |
1da177e4 LT |
1623 | } |
1624 | ||
636b1ec8 FT |
1625 | /** |
1626 | * do_reset - issue a reset command | |
1627 | * @instance: adapter to reset | |
1628 | * | |
1629 | * Issue a reset sequence to the NCR5380 and try and get the bus | |
1630 | * back into sane shape. | |
1631 | * | |
1632 | * This clears the reset interrupt flag because there may be no handler for | |
1633 | * it. When the driver is initialized, the NCR5380_intr() handler has not yet | |
1634 | * been installed. And when in EH we may have released the ST DMA interrupt. | |
1635 | */ | |
1636 | ||
1637 | static void do_reset(struct Scsi_Host *instance) | |
1638 | { | |
1639 | unsigned long flags; | |
1640 | ||
1641 | local_irq_save(flags); | |
1642 | NCR5380_write(TARGET_COMMAND_REG, | |
1643 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); | |
1644 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
1645 | udelay(50); | |
1646 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1647 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1648 | local_irq_restore(flags); | |
1649 | } | |
1650 | ||
80d3eb6d FT |
1651 | /** |
1652 | * do_abort - abort the currently established nexus by going to | |
1653 | * MESSAGE OUT phase and sending an ABORT message. | |
1654 | * @instance: relevant scsi host instance | |
c28bda25 | 1655 | * |
80d3eb6d | 1656 | * Returns 0 on success, -1 on failure. |
1da177e4 LT |
1657 | */ |
1658 | ||
a53a21e4 | 1659 | static int do_abort(struct Scsi_Host *instance) |
1da177e4 | 1660 | { |
ac15c3bc | 1661 | unsigned char *msgptr, phase, tmp; |
c28bda25 | 1662 | int len; |
80d3eb6d | 1663 | int rc; |
c28bda25 RZ |
1664 | |
1665 | /* Request message out phase */ | |
1da177e4 | 1666 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1667 | |
1668 | /* | |
1669 | * Wait for the target to indicate a valid phase by asserting | |
1670 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1671 | * and can immediately send the ABORT message, or we'll have some | |
1672 | * other phase and will have to source/sink data. | |
1673 | * | |
1674 | * We really don't care what value was on the bus or what value | |
1675 | * the target sees, so we just handshake. | |
1676 | */ | |
1677 | ||
80d3eb6d FT |
1678 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); |
1679 | if (rc < 0) | |
1680 | goto timeout; | |
1681 | ||
1682 | tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; | |
c28bda25 RZ |
1683 | |
1684 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1685 | ||
80d3eb6d FT |
1686 | if (tmp != PHASE_MSGOUT) { |
1687 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1688 | ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1689 | rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); | |
1690 | if (rc < 0) | |
1691 | goto timeout; | |
c28bda25 RZ |
1692 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1693 | } | |
1694 | ||
1695 | tmp = ABORT; | |
1696 | msgptr = &tmp; | |
1697 | len = 1; | |
1698 | phase = PHASE_MSGOUT; | |
a53a21e4 | 1699 | NCR5380_transfer_pio(instance, &phase, &len, &msgptr); |
c28bda25 RZ |
1700 | |
1701 | /* | |
1702 | * If we got here, and the command completed successfully, | |
1703 | * we're about to go into bus free state. | |
1704 | */ | |
1705 | ||
1706 | return len ? -1 : 0; | |
80d3eb6d FT |
1707 | |
1708 | timeout: | |
1709 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1710 | return -1; | |
1da177e4 LT |
1711 | } |
1712 | ||
1713 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1714 | /* |
1715 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
594d4ba3 | 1716 | * unsigned char *phase, int *count, unsigned char **data) |
1da177e4 LT |
1717 | * |
1718 | * Purpose : transfers data in given phase using either real | |
594d4ba3 | 1719 | * or pseudo DMA. |
1da177e4 | 1720 | * |
c28bda25 | 1721 | * Inputs : instance - instance of driver, *phase - pointer to |
594d4ba3 FT |
1722 | * what phase is expected, *count - pointer to number of |
1723 | * bytes to transfer, **data - pointer to data pointer. | |
c28bda25 | 1724 | * |
1da177e4 | 1725 | * Returns : -1 when different phase is entered without transferring |
594d4ba3 FT |
1726 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1727 | * is in same phase. | |
1da177e4 | 1728 | * |
594d4ba3 | 1729 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1730 | */ |
1731 | ||
1732 | ||
c28bda25 RZ |
1733 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1734 | unsigned char *phase, int *count, | |
1735 | unsigned char **data) | |
1da177e4 | 1736 | { |
e8a60144 | 1737 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1738 | register int c = *count; |
1739 | register unsigned char p = *phase; | |
e3f463b0 FT |
1740 | |
1741 | #if defined(CONFIG_SUN3) | |
1742 | /* sanity check */ | |
1743 | if (!sun3_dma_setup_done) { | |
1744 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1745 | instance->host_no); | |
1746 | BUG(); | |
1747 | } | |
1748 | hostdata->dma_len = c; | |
1749 | ||
b746545f FT |
1750 | dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", |
1751 | (p & SR_IO) ? "receive" : "send", c, *data); | |
e3f463b0 FT |
1752 | |
1753 | /* netbsd turns off ints here, why not be safe and do it too */ | |
e3f463b0 FT |
1754 | |
1755 | /* send start chain */ | |
1756 | sun3scsi_dma_start(c, *data); | |
1757 | ||
cd400825 FT |
1758 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1759 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | | |
1760 | MR_ENABLE_EOP_INTR); | |
e3f463b0 | 1761 | if (p & SR_IO) { |
e3f463b0 | 1762 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
e3f463b0 FT |
1763 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
1764 | } else { | |
e3f463b0 | 1765 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
e3f463b0 FT |
1766 | NCR5380_write(START_DMA_SEND_REG, 0); |
1767 | } | |
1768 | ||
1769 | #ifdef SUN3_SCSI_VME | |
1770 | dregs->csr |= CSR_DMA_ENABLE; | |
1771 | #endif | |
1772 | ||
e3f463b0 FT |
1773 | sun3_dma_active = 1; |
1774 | ||
1775 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1776 | register unsigned char *d = *data; |
1777 | unsigned char tmp; | |
c28bda25 RZ |
1778 | |
1779 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1780 | *phase = tmp; | |
1781 | return -1; | |
1782 | } | |
1da177e4 | 1783 | |
ef1081cb FT |
1784 | if (hostdata->read_overruns && (p & SR_IO)) |
1785 | c -= hostdata->read_overruns; | |
1da177e4 | 1786 | |
b746545f FT |
1787 | dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", |
1788 | (p & SR_IO) ? "receive" : "send", c, d); | |
1da177e4 | 1789 | |
c28bda25 | 1790 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
cd400825 FT |
1791 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
1792 | MR_ENABLE_EOP_INTR); | |
1da177e4 | 1793 | |
ef1081cb | 1794 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1795 | /* On the Medusa, it is a must to initialize the DMA before |
1796 | * starting the NCR. This is also the cleaner way for the TT. | |
1797 | */ | |
c28bda25 RZ |
1798 | hostdata->dma_len = (p & SR_IO) ? |
1799 | NCR5380_dma_read_setup(instance, d, c) : | |
1800 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 RZ |
1801 | } |
1802 | ||
1803 | if (p & SR_IO) | |
1804 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1805 | else { | |
1806 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1807 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1808 | } | |
1809 | ||
ef1081cb | 1810 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1811 | /* On the Falcon, the DMA setup must be done after the last */ |
1812 | /* NCR access, else the DMA setup gets trashed! | |
1813 | */ | |
c28bda25 RZ |
1814 | hostdata->dma_len = (p & SR_IO) ? |
1815 | NCR5380_dma_read_setup(instance, d, c) : | |
1816 | NCR5380_dma_write_setup(instance, d, c); | |
c28bda25 | 1817 | } |
e3f463b0 FT |
1818 | #endif /* !defined(CONFIG_SUN3) */ |
1819 | ||
c28bda25 | 1820 | return 0; |
1da177e4 LT |
1821 | } |
1822 | #endif /* defined(REAL_DMA) */ | |
1823 | ||
1824 | /* | |
1825 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1826 | * | |
c28bda25 | 1827 | * Purpose : run through the various SCSI phases and do as the target |
594d4ba3 FT |
1828 | * directs us to. Operates on the currently connected command, |
1829 | * instance->connected. | |
1da177e4 LT |
1830 | * |
1831 | * Inputs : instance, instance for which we are doing commands | |
1832 | * | |
c28bda25 | 1833 | * Side effects : SCSI things happen, the disconnected queue will be |
594d4ba3 FT |
1834 | * modified if a command disconnects, *instance->connected will |
1835 | * change. | |
1da177e4 | 1836 | * |
c28bda25 | 1837 | * XXX Note : we need to watch for bus free or a reset condition here |
594d4ba3 | 1838 | * to recover from an unexpected bus free condition. |
1da177e4 | 1839 | */ |
c28bda25 RZ |
1840 | |
1841 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1842 | { |
e8a60144 | 1843 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 RZ |
1844 | unsigned char msgout = NOP; |
1845 | int sink = 0; | |
1846 | int len; | |
c28bda25 | 1847 | int transfersize; |
c28bda25 RZ |
1848 | unsigned char *data; |
1849 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
11d2f63b | 1850 | struct scsi_cmnd *cmd; |
c28bda25 | 1851 | |
e3f463b0 FT |
1852 | #ifdef SUN3_SCSI_VME |
1853 | dregs->csr |= CSR_INTR; | |
1854 | #endif | |
1855 | ||
11d2f63b | 1856 | while ((cmd = hostdata->connected)) { |
32b26a10 FT |
1857 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
1858 | ||
c28bda25 RZ |
1859 | tmp = NCR5380_read(STATUS_REG); |
1860 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1861 | if (tmp & SR_REQ) { | |
1862 | phase = (tmp & PHASE_MASK); | |
1863 | if (phase != old_phase) { | |
1864 | old_phase = phase; | |
8ad3a593 | 1865 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1866 | } |
e3f463b0 FT |
1867 | #if defined(CONFIG_SUN3) |
1868 | if (phase == PHASE_CMDOUT) { | |
1869 | #if defined(REAL_DMA) | |
1870 | void *d; | |
1871 | unsigned long count; | |
1872 | ||
1873 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1874 | count = cmd->SCp.buffer->length; | |
1875 | d = sg_virt(cmd->SCp.buffer); | |
1876 | } else { | |
1877 | count = cmd->SCp.this_residual; | |
1878 | d = cmd->SCp.ptr; | |
1879 | } | |
1880 | /* this command setup for dma yet? */ | |
1881 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
1882 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
cd46140a | 1883 | sun3scsi_dma_setup(instance, d, count, |
e3f463b0 FT |
1884 | rq_data_dir(cmd->request)); |
1885 | sun3_dma_setup_done = cmd; | |
1886 | } | |
1887 | } | |
1888 | #endif | |
1889 | #ifdef SUN3_SCSI_VME | |
1890 | dregs->csr |= CSR_INTR; | |
1891 | #endif | |
1892 | } | |
1893 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 1894 | |
c28bda25 RZ |
1895 | if (sink && (phase != PHASE_MSGOUT)) { |
1896 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1897 | ||
1898 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
3d07d22b | 1899 | ICR_ASSERT_ACK); |
c28bda25 RZ |
1900 | while (NCR5380_read(STATUS_REG) & SR_REQ) |
1901 | ; | |
1902 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
3d07d22b | 1903 | ICR_ASSERT_ATN); |
c28bda25 RZ |
1904 | sink = 0; |
1905 | continue; | |
1906 | } | |
1907 | ||
1908 | switch (phase) { | |
1909 | case PHASE_DATAOUT: | |
1da177e4 | 1910 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
6a6ff4ac | 1911 | shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n"); |
c28bda25 RZ |
1912 | sink = 1; |
1913 | do_abort(instance); | |
1914 | cmd->result = DID_ERROR << 16; | |
677e0194 | 1915 | complete_cmd(instance, cmd); |
dc183965 | 1916 | hostdata->connected = NULL; |
c28bda25 | 1917 | return; |
1da177e4 | 1918 | #endif |
c28bda25 RZ |
1919 | case PHASE_DATAIN: |
1920 | /* | |
1921 | * If there is no room left in the current buffer in the | |
1922 | * scatter-gather list, move onto the next one. | |
1923 | */ | |
1924 | ||
1925 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1926 | ++cmd->SCp.buffer; | |
1927 | --cmd->SCp.buffers_residual; | |
1928 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1929 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 | 1930 | merge_contiguous_buffers(cmd); |
b746545f FT |
1931 | dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", |
1932 | cmd->SCp.this_residual, | |
1933 | cmd->SCp.buffers_residual); | |
c28bda25 RZ |
1934 | } |
1935 | ||
1936 | /* | |
1937 | * The preferred transfer method is going to be | |
1938 | * PSEUDO-DMA for systems that are strictly PIO, | |
1939 | * since we can let the hardware do the handshaking. | |
1940 | * | |
1941 | * For this to work, we need to know the transfersize | |
1942 | * ahead of time, since the pseudo-DMA code will sit | |
1943 | * in an unconditional loop. | |
1944 | */ | |
1945 | ||
1946 | /* ++roman: I suggest, this should be | |
594d4ba3 | 1947 | * #if def(REAL_DMA) |
c28bda25 RZ |
1948 | * instead of leaving REAL_DMA out. |
1949 | */ | |
1da177e4 LT |
1950 | |
1951 | #if defined(REAL_DMA) | |
e3f463b0 | 1952 | #if !defined(CONFIG_SUN3) |
ff3d4578 FT |
1953 | transfersize = 0; |
1954 | if (!cmd->device->borken) | |
e3f463b0 | 1955 | #endif |
ff3d4578 FT |
1956 | transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); |
1957 | ||
1958 | if (transfersize >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
1959 | len = transfersize; |
1960 | cmd->SCp.phase = phase; | |
1961 | if (NCR5380_transfer_dma(instance, &phase, | |
1962 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
1963 | /* | |
1964 | * If the watchdog timer fires, all future | |
1965 | * accesses to this device will use the | |
c16df32e FT |
1966 | * polled-IO. |
1967 | */ | |
ff50f9ed FT |
1968 | scmd_printk(KERN_INFO, cmd, |
1969 | "switching to slow handshake\n"); | |
c28bda25 | 1970 | cmd->device->borken = 1; |
c28bda25 RZ |
1971 | sink = 1; |
1972 | do_abort(instance); | |
1973 | cmd->result = DID_ERROR << 16; | |
c28bda25 RZ |
1974 | /* XXX - need to source or sink data here, as appropriate */ |
1975 | } else { | |
1da177e4 | 1976 | #ifdef REAL_DMA |
c28bda25 RZ |
1977 | /* ++roman: When using real DMA, |
1978 | * information_transfer() should return after | |
1979 | * starting DMA since it has nothing more to | |
1980 | * do. | |
1981 | */ | |
1982 | return; | |
1983 | #else | |
1984 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 1985 | #endif |
c28bda25 RZ |
1986 | } |
1987 | } else | |
1da177e4 | 1988 | #endif /* defined(REAL_DMA) */ |
11d2f63b | 1989 | { |
1678847e FT |
1990 | /* Break up transfer into 3 ms chunks, |
1991 | * presuming 6 accesses per handshake. | |
1992 | */ | |
1993 | transfersize = min((unsigned long)cmd->SCp.this_residual, | |
1994 | hostdata->accesses_per_ms / 2); | |
1995 | len = transfersize; | |
1996 | NCR5380_transfer_pio(instance, &phase, &len, | |
3d07d22b | 1997 | (unsigned char **)&cmd->SCp.ptr); |
1678847e | 1998 | cmd->SCp.this_residual -= transfersize - len; |
11d2f63b | 1999 | } |
e3f463b0 FT |
2000 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2001 | /* if we had intended to dma that command clear it */ | |
2002 | if (sun3_dma_setup_done == cmd) | |
2003 | sun3_dma_setup_done = NULL; | |
2004 | #endif | |
1678847e | 2005 | return; |
c28bda25 RZ |
2006 | case PHASE_MSGIN: |
2007 | len = 1; | |
2008 | data = &tmp; | |
c28bda25 RZ |
2009 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
2010 | cmd->SCp.Message = tmp; | |
2011 | ||
2012 | switch (tmp) { | |
c28bda25 RZ |
2013 | case ABORT: |
2014 | case COMMAND_COMPLETE: | |
2015 | /* Accept message by clearing ACK */ | |
2016 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
0d3d9a42 FT |
2017 | dsprintk(NDEBUG_QUEUES, instance, |
2018 | "COMMAND COMPLETE %p target %d lun %llu\n", | |
2019 | cmd, scmd_id(cmd), cmd->device->lun); | |
e3c3da67 | 2020 | |
e3c3da67 | 2021 | hostdata->connected = NULL; |
1da177e4 | 2022 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2023 | cmd_free_tag(cmd); |
2024 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
b746545f FT |
2025 | u8 lun = cmd->device->lun; |
2026 | struct tag_alloc *ta = &hostdata->TagAlloc[scmd_id(cmd)][lun]; | |
2027 | ||
2028 | dsprintk(NDEBUG_TAGS, instance, | |
2029 | "QUEUE_FULL %p target %d lun %d nr_allocated %d\n", | |
2030 | cmd, scmd_id(cmd), lun, ta->nr_allocated); | |
c28bda25 | 2031 | if (ta->queue_size > ta->nr_allocated) |
e42d0151 | 2032 | ta->queue_size = ta->nr_allocated; |
c28bda25 | 2033 | } |
1da177e4 | 2034 | #endif |
c28bda25 | 2035 | |
f27db8eb FT |
2036 | cmd->result &= ~0xffff; |
2037 | cmd->result |= cmd->SCp.Status; | |
2038 | cmd->result |= cmd->SCp.Message << 8; | |
28424d3a | 2039 | |
f27db8eb | 2040 | if (cmd->cmnd[0] == REQUEST_SENSE) |
677e0194 | 2041 | complete_cmd(instance, cmd); |
f27db8eb FT |
2042 | else { |
2043 | if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION || | |
2044 | cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) { | |
2045 | dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n", | |
2046 | cmd); | |
2047 | list_add_tail(&ncmd->list, | |
2048 | &hostdata->autosense); | |
2049 | } else | |
2050 | complete_cmd(instance, cmd); | |
c28bda25 RZ |
2051 | } |
2052 | ||
c28bda25 RZ |
2053 | /* |
2054 | * Restore phase bits to 0 so an interrupted selection, | |
2055 | * arbitration can resume. | |
2056 | */ | |
2057 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2058 | ||
72064a78 FT |
2059 | /* Enable reselect interrupts */ |
2060 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2061 | ||
e3c3da67 | 2062 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2063 | return; |
2064 | case MESSAGE_REJECT: | |
2065 | /* Accept message by clearing ACK */ | |
2066 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2067 | switch (hostdata->last_message) { |
2068 | case HEAD_OF_QUEUE_TAG: | |
2069 | case ORDERED_QUEUE_TAG: | |
2070 | case SIMPLE_QUEUE_TAG: | |
2071 | /* The target obviously doesn't support tagged | |
2072 | * queuing, even though it announced this ability in | |
2073 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2074 | * clear 'tagged_supported' and lock the LUN, since | |
2075 | * the command is treated as untagged further on. | |
2076 | */ | |
2077 | cmd->device->tagged_supported = 0; | |
2078 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2079 | cmd->tag = TAG_NONE; | |
b746545f FT |
2080 | dsprintk(NDEBUG_TAGS, instance, "target %d lun %llu rejected QUEUE_TAG message; tagged queuing disabled\n", |
2081 | scmd_id(cmd), cmd->device->lun); | |
c28bda25 RZ |
2082 | break; |
2083 | } | |
2084 | break; | |
2085 | case DISCONNECT: | |
2086 | /* Accept message by clearing ACK */ | |
2087 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 | 2088 | hostdata->connected = NULL; |
32b26a10 | 2089 | list_add(&ncmd->list, &hostdata->disconnected); |
0d3d9a42 FT |
2090 | dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, |
2091 | instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", | |
2092 | cmd, scmd_id(cmd), cmd->device->lun); | |
2093 | ||
c28bda25 RZ |
2094 | /* |
2095 | * Restore phase bits to 0 so an interrupted selection, | |
2096 | * arbitration can resume. | |
2097 | */ | |
2098 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2099 | ||
2100 | /* Enable reselect interrupts */ | |
2101 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
e3f463b0 FT |
2102 | #ifdef SUN3_SCSI_VME |
2103 | dregs->csr |= CSR_DMA_ENABLE; | |
2104 | #endif | |
c28bda25 RZ |
2105 | return; |
2106 | /* | |
2107 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2108 | * operation, in violation of the SCSI spec so we can safely | |
2109 | * ignore SAVE/RESTORE pointers calls. | |
2110 | * | |
2111 | * Unfortunately, some disks violate the SCSI spec and | |
2112 | * don't issue the required SAVE_POINTERS message before | |
2113 | * disconnecting, and we have to break spec to remain | |
2114 | * compatible. | |
2115 | */ | |
2116 | case SAVE_POINTERS: | |
2117 | case RESTORE_POINTERS: | |
2118 | /* Accept message by clearing ACK */ | |
2119 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
c28bda25 RZ |
2120 | break; |
2121 | case EXTENDED_MESSAGE: | |
2122 | /* | |
c16df32e | 2123 | * Start the message buffer with the EXTENDED_MESSAGE |
c28bda25 RZ |
2124 | * byte, since spi_print_msg() wants the whole thing. |
2125 | */ | |
2126 | extended_msg[0] = EXTENDED_MESSAGE; | |
2127 | /* Accept first byte by clearing ACK */ | |
2128 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2129 | ||
11d2f63b FT |
2130 | spin_unlock_irq(&hostdata->lock); |
2131 | ||
b746545f | 2132 | dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n"); |
c28bda25 RZ |
2133 | |
2134 | len = 2; | |
2135 | data = extended_msg + 1; | |
2136 | phase = PHASE_MSGIN; | |
2137 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
2138 | dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n", |
2139 | (int)extended_msg[1], | |
2140 | (int)extended_msg[2]); | |
c28bda25 | 2141 | |
e0783ed3 FT |
2142 | if (!len && extended_msg[1] > 0 && |
2143 | extended_msg[1] <= sizeof(extended_msg) - 2) { | |
c28bda25 RZ |
2144 | /* Accept third byte by clearing ACK */ |
2145 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2146 | len = extended_msg[1] - 1; | |
2147 | data = extended_msg + 3; | |
2148 | phase = PHASE_MSGIN; | |
2149 | ||
2150 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
b746545f FT |
2151 | dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n", |
2152 | len); | |
c28bda25 RZ |
2153 | |
2154 | switch (extended_msg[2]) { | |
2155 | case EXTENDED_SDTR: | |
2156 | case EXTENDED_WDTR: | |
2157 | case EXTENDED_MODIFY_DATA_POINTER: | |
2158 | case EXTENDED_EXTENDED_IDENTIFY: | |
2159 | tmp = 0; | |
2160 | } | |
2161 | } else if (len) { | |
6a6ff4ac | 2162 | shost_printk(KERN_ERR, instance, "error receiving extended message\n"); |
c28bda25 RZ |
2163 | tmp = 0; |
2164 | } else { | |
6a6ff4ac FT |
2165 | shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n", |
2166 | extended_msg[2], extended_msg[1]); | |
c28bda25 RZ |
2167 | tmp = 0; |
2168 | } | |
11d2f63b FT |
2169 | |
2170 | spin_lock_irq(&hostdata->lock); | |
2171 | if (!hostdata->connected) | |
2172 | return; | |
2173 | ||
c28bda25 RZ |
2174 | /* Fall through to reject message */ |
2175 | ||
2176 | /* | |
2177 | * If we get something weird that we aren't expecting, | |
2178 | * reject it. | |
2179 | */ | |
2180 | default: | |
2181 | if (!tmp) { | |
6a6ff4ac | 2182 | shost_printk(KERN_ERR, instance, "rejecting message "); |
c28bda25 RZ |
2183 | spi_print_msg(extended_msg); |
2184 | printk("\n"); | |
2185 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2186 | scmd_printk(KERN_INFO, cmd, |
2187 | "rejecting unknown message %02x\n", | |
2188 | tmp); | |
c28bda25 | 2189 | else |
ff50f9ed FT |
2190 | scmd_printk(KERN_INFO, cmd, |
2191 | "rejecting unknown extended message code %02x, length %d\n", | |
2192 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2193 | |
2194 | msgout = MESSAGE_REJECT; | |
2195 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2196 | break; | |
2197 | } /* switch (tmp) */ | |
2198 | break; | |
2199 | case PHASE_MSGOUT: | |
2200 | len = 1; | |
2201 | data = &msgout; | |
2202 | hostdata->last_message = msgout; | |
2203 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2204 | if (msgout == ABORT) { | |
c28bda25 RZ |
2205 | hostdata->connected = NULL; |
2206 | cmd->result = DID_ERROR << 16; | |
677e0194 | 2207 | complete_cmd(instance, cmd); |
e3c3da67 | 2208 | maybe_release_dma_irq(instance); |
cd400825 | 2209 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
c28bda25 RZ |
2210 | return; |
2211 | } | |
2212 | msgout = NOP; | |
2213 | break; | |
2214 | case PHASE_CMDOUT: | |
2215 | len = cmd->cmd_len; | |
2216 | data = cmd->cmnd; | |
2217 | /* | |
2218 | * XXX for performance reasons, on machines with a | |
2219 | * PSEUDO-DMA architecture we should probably | |
2220 | * use the dma transfer function. | |
2221 | */ | |
2222 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2223 | break; | |
2224 | case PHASE_STATIN: | |
2225 | len = 1; | |
2226 | data = &tmp; | |
2227 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2228 | cmd->SCp.Status = tmp; | |
2229 | break; | |
2230 | default: | |
6a6ff4ac | 2231 | shost_printk(KERN_ERR, instance, "unknown phase\n"); |
8ad3a593 | 2232 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 | 2233 | } /* switch(phase) */ |
686f3990 | 2234 | } else { |
11d2f63b | 2235 | spin_unlock_irq(&hostdata->lock); |
686f3990 | 2236 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
11d2f63b | 2237 | spin_lock_irq(&hostdata->lock); |
686f3990 | 2238 | } |
11d2f63b | 2239 | } |
1da177e4 LT |
2240 | } |
2241 | ||
2242 | /* | |
2243 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2244 | * | |
c28bda25 | 2245 | * Purpose : does reselection, initializing the instance->connected |
594d4ba3 FT |
2246 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
2247 | * nexus has been reestablished, | |
c28bda25 | 2248 | * |
1da177e4 | 2249 | * Inputs : instance - this instance of the NCR5380. |
1da177e4 LT |
2250 | */ |
2251 | ||
2252 | ||
e3f463b0 FT |
2253 | /* it might eventually prove necessary to do a dma setup on |
2254 | reselection, but it doesn't seem to be needed now -- sam */ | |
2255 | ||
c28bda25 | 2256 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2257 | { |
e8a60144 | 2258 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2259 | unsigned char target_mask; |
e3f463b0 | 2260 | unsigned char lun; |
1da177e4 | 2261 | #ifdef SUPPORT_TAGS |
c28bda25 | 2262 | unsigned char tag; |
1da177e4 | 2263 | #endif |
c28bda25 | 2264 | unsigned char msg[3]; |
e3f463b0 FT |
2265 | int __maybe_unused len; |
2266 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
32b26a10 FT |
2267 | struct NCR5380_cmd *ncmd; |
2268 | struct scsi_cmnd *tmp; | |
c28bda25 RZ |
2269 | |
2270 | /* | |
2271 | * Disable arbitration, etc. since the host adapter obviously | |
2272 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2273 | */ | |
2274 | ||
2275 | NCR5380_write(MODE_REG, MR_BASE); | |
c28bda25 RZ |
2276 | |
2277 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2278 | ||
b746545f | 2279 | dsprintk(NDEBUG_RESELECTION, instance, "reselect\n"); |
c28bda25 RZ |
2280 | |
2281 | /* | |
2282 | * At this point, we have detected that our SCSI ID is on the bus, | |
2283 | * SEL is true and BSY was false for at least one bus settle delay | |
2284 | * (400 ns). | |
2285 | * | |
2286 | * We must assert BSY ourselves, until the target drops the SEL | |
2287 | * signal. | |
2288 | */ | |
2289 | ||
2290 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
72064a78 FT |
2291 | if (NCR5380_poll_politely(instance, |
2292 | STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { | |
2293 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2294 | return; | |
2295 | } | |
c28bda25 RZ |
2296 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
2297 | ||
2298 | /* | |
2299 | * Wait for target to go into MSGIN. | |
2300 | */ | |
2301 | ||
72064a78 FT |
2302 | if (NCR5380_poll_politely(instance, |
2303 | STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { | |
2304 | do_abort(instance); | |
2305 | return; | |
2306 | } | |
c28bda25 | 2307 | |
e3f463b0 FT |
2308 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2309 | /* acknowledge toggle to MSGIN */ | |
2310 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2311 | ||
2312 | /* peek at the byte without really hitting the bus */ | |
2313 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2314 | #else | |
c28bda25 RZ |
2315 | len = 1; |
2316 | data = msg; | |
2317 | phase = PHASE_MSGIN; | |
2318 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
72064a78 FT |
2319 | |
2320 | if (len) { | |
2321 | do_abort(instance); | |
2322 | return; | |
2323 | } | |
e3f463b0 | 2324 | #endif |
c28bda25 RZ |
2325 | |
2326 | if (!(msg[0] & 0x80)) { | |
72064a78 | 2327 | shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
c28bda25 | 2328 | spi_print_msg(msg); |
72064a78 | 2329 | printk("\n"); |
c28bda25 RZ |
2330 | do_abort(instance); |
2331 | return; | |
2332 | } | |
72064a78 | 2333 | lun = msg[0] & 0x07; |
1da177e4 | 2334 | |
e3f463b0 | 2335 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2336 | /* If the phase is still MSGIN, the target wants to send some more |
2337 | * messages. In case it supports tagged queuing, this is probably a | |
2338 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2339 | */ | |
2340 | tag = TAG_NONE; | |
ca513fc9 | 2341 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2342 | /* Accept previous IDENTIFY message by clearing ACK */ |
2343 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2344 | len = 2; | |
2345 | data = msg + 1; | |
2346 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2347 | msg[1] == SIMPLE_QUEUE_TAG) | |
2348 | tag = msg[2]; | |
b746545f FT |
2349 | dsprintk(NDEBUG_TAGS, instance, "reselect: target mask %02x, lun %d sent tag %d\n", |
2350 | target_mask, lun, tag); | |
c28bda25 | 2351 | } |
1da177e4 | 2352 | #endif |
c28bda25 RZ |
2353 | |
2354 | /* | |
2355 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2356 | * just reestablished, and remove it from the disconnected queue. | |
2357 | */ | |
2358 | ||
32b26a10 FT |
2359 | tmp = NULL; |
2360 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { | |
2361 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
2362 | ||
2363 | if (target_mask == (1 << scmd_id(cmd)) && | |
2364 | lun == (u8)cmd->device->lun | |
1da177e4 | 2365 | #ifdef SUPPORT_TAGS |
32b26a10 | 2366 | && (tag == cmd->tag) |
1da177e4 | 2367 | #endif |
c28bda25 | 2368 | ) { |
32b26a10 FT |
2369 | list_del(&ncmd->list); |
2370 | tmp = cmd; | |
c28bda25 RZ |
2371 | break; |
2372 | } | |
1da177e4 | 2373 | } |
c28bda25 | 2374 | |
0d3d9a42 FT |
2375 | if (tmp) { |
2376 | dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, | |
2377 | "reselect: removed %p from disconnected queue\n", tmp); | |
2378 | } else { | |
2379 | ||
1da177e4 | 2380 | #ifdef SUPPORT_TAGS |
72064a78 FT |
2381 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d tag %d not in disconnected queue.\n", |
2382 | target_mask, lun, tag); | |
2383 | #else | |
2384 | shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", | |
2385 | target_mask, lun); | |
1da177e4 | 2386 | #endif |
c28bda25 RZ |
2387 | /* |
2388 | * Since we have an established nexus that we can't do anything | |
2389 | * with, we must abort it. | |
2390 | */ | |
2391 | do_abort(instance); | |
2392 | return; | |
2393 | } | |
1da177e4 | 2394 | |
e3f463b0 FT |
2395 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2396 | /* engage dma setup for the command we just saw */ | |
2397 | { | |
2398 | void *d; | |
2399 | unsigned long count; | |
2400 | ||
2401 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2402 | count = tmp->SCp.buffer->length; | |
2403 | d = sg_virt(tmp->SCp.buffer); | |
2404 | } else { | |
2405 | count = tmp->SCp.this_residual; | |
2406 | d = tmp->SCp.ptr; | |
2407 | } | |
2408 | /* setup this command for dma if not already */ | |
2409 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
cd46140a FT |
2410 | sun3scsi_dma_setup(instance, d, count, |
2411 | rq_data_dir(tmp->request)); | |
e3f463b0 FT |
2412 | sun3_dma_setup_done = tmp; |
2413 | } | |
2414 | } | |
2415 | ||
2416 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2417 | #endif | |
2418 | ||
c28bda25 RZ |
2419 | /* Accept message by clearing ACK */ |
2420 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2421 | |
e3f463b0 FT |
2422 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2423 | /* If the phase is still MSGIN, the target wants to send some more | |
2424 | * messages. In case it supports tagged queuing, this is probably a | |
2425 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2426 | */ | |
2427 | tag = TAG_NONE; | |
2428 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2429 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2430 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2431 | len = 2; | |
2432 | data = msg + 1; | |
2433 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2434 | msg[1] == SIMPLE_QUEUE_TAG) | |
2435 | tag = msg[2]; | |
b746545f FT |
2436 | dsprintk(NDEBUG_TAGS, instance, "reselect: target mask %02x, lun %d sent tag %d\n" |
2437 | target_mask, lun, tag); | |
e3f463b0 FT |
2438 | } |
2439 | #endif | |
2440 | ||
c28bda25 | 2441 | hostdata->connected = tmp; |
b746545f FT |
2442 | dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n", |
2443 | scmd_id(tmp), tmp->device->lun, tmp->tag); | |
1da177e4 LT |
2444 | } |
2445 | ||
2446 | ||
8b00c3d5 FT |
2447 | /** |
2448 | * list_find_cmd - test for presence of a command in a linked list | |
2449 | * @haystack: list of commands | |
2450 | * @needle: command to search for | |
1da177e4 LT |
2451 | */ |
2452 | ||
8b00c3d5 FT |
2453 | static bool list_find_cmd(struct list_head *haystack, |
2454 | struct scsi_cmnd *needle) | |
2455 | { | |
2456 | struct NCR5380_cmd *ncmd; | |
2457 | ||
2458 | list_for_each_entry(ncmd, haystack, list) | |
2459 | if (NCR5380_to_scmd(ncmd) == needle) | |
2460 | return true; | |
2461 | return false; | |
2462 | } | |
2463 | ||
2464 | /** | |
2465 | * list_remove_cmd - remove a command from linked list | |
2466 | * @haystack: list of commands | |
2467 | * @needle: command to remove | |
2468 | */ | |
2469 | ||
2470 | static bool list_del_cmd(struct list_head *haystack, | |
2471 | struct scsi_cmnd *needle) | |
2472 | { | |
2473 | if (list_find_cmd(haystack, needle)) { | |
2474 | struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle); | |
2475 | ||
2476 | list_del(&ncmd->list); | |
2477 | return true; | |
2478 | } | |
2479 | return false; | |
2480 | } | |
2481 | ||
2482 | /** | |
2483 | * NCR5380_abort - scsi host eh_abort_handler() method | |
2484 | * @cmd: the command to be aborted | |
2485 | * | |
2486 | * Try to abort a given command by removing it from queues and/or sending | |
2487 | * the target an abort message. This may not succeed in causing a target | |
2488 | * to abort the command. Nonetheless, the low-level driver must forget about | |
2489 | * the command because the mid-layer reclaims it and it may be re-issued. | |
2490 | * | |
2491 | * The normal path taken by a command is as follows. For EH we trace this | |
2492 | * same path to locate and abort the command. | |
2493 | * | |
2494 | * unissued -> selecting -> [unissued -> selecting ->]... connected -> | |
2495 | * [disconnected -> connected ->]... | |
2496 | * [autosense -> connected ->] done | |
2497 | * | |
8b00c3d5 FT |
2498 | * If cmd was not found at all then presumably it has already been completed, |
2499 | * in which case return SUCCESS to try to avoid further EH measures. | |
dc183965 | 2500 | * |
8b00c3d5 | 2501 | * If the command has not completed yet, we must not fail to find it. |
dc183965 FT |
2502 | * We have no option but to forget the aborted command (even if it still |
2503 | * lacks sense data). The mid-layer may re-issue a command that is in error | |
2504 | * recovery (see scsi_send_eh_cmnd), but the logic and data structures in | |
2505 | * this driver are such that a command can appear on one queue only. | |
71a00593 FT |
2506 | * |
2507 | * The lock protects driver data structures, but EH handlers also use it | |
2508 | * to serialize their own execution and prevent their own re-entry. | |
8b00c3d5 FT |
2509 | */ |
2510 | ||
2511 | static int NCR5380_abort(struct scsi_cmnd *cmd) | |
1da177e4 | 2512 | { |
c28bda25 | 2513 | struct Scsi_Host *instance = cmd->device->host; |
e8a60144 | 2514 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
c28bda25 | 2515 | unsigned long flags; |
8b00c3d5 | 2516 | int result = SUCCESS; |
1da177e4 | 2517 | |
11d2f63b | 2518 | spin_lock_irqsave(&hostdata->lock, flags); |
c28bda25 | 2519 | |
32b26a10 | 2520 | #if (NDEBUG & NDEBUG_ANY) |
8b00c3d5 | 2521 | scmd_printk(KERN_INFO, cmd, __func__); |
32b26a10 | 2522 | #endif |
e5c3fddf FT |
2523 | NCR5380_dprint(NDEBUG_ANY, instance); |
2524 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
1da177e4 | 2525 | |
8b00c3d5 FT |
2526 | if (list_del_cmd(&hostdata->unissued, cmd)) { |
2527 | dsprintk(NDEBUG_ABORT, instance, | |
2528 | "abort: removed %p from issue queue\n", cmd); | |
2529 | cmd->result = DID_ABORT << 16; | |
2530 | cmd->scsi_done(cmd); /* No tag or busy flag to worry about */ | |
dc183965 | 2531 | goto out; |
8b00c3d5 FT |
2532 | } |
2533 | ||
707d62b3 FT |
2534 | if (hostdata->selecting == cmd) { |
2535 | dsprintk(NDEBUG_ABORT, instance, | |
2536 | "abort: cmd %p == selecting\n", cmd); | |
2537 | hostdata->selecting = NULL; | |
2538 | cmd->result = DID_ABORT << 16; | |
2539 | complete_cmd(instance, cmd); | |
2540 | goto out; | |
2541 | } | |
2542 | ||
8b00c3d5 FT |
2543 | if (list_del_cmd(&hostdata->disconnected, cmd)) { |
2544 | dsprintk(NDEBUG_ABORT, instance, | |
2545 | "abort: removed %p from disconnected list\n", cmd); | |
71a00593 FT |
2546 | /* Can't call NCR5380_select() and send ABORT because that |
2547 | * means releasing the lock. Need a bus reset. | |
2548 | */ | |
dc183965 FT |
2549 | set_host_byte(cmd, DID_ERROR); |
2550 | complete_cmd(instance, cmd); | |
71a00593 FT |
2551 | result = FAILED; |
2552 | goto out; | |
8b00c3d5 FT |
2553 | } |
2554 | ||
2555 | if (hostdata->connected == cmd) { | |
2556 | dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); | |
2557 | hostdata->connected = NULL; | |
8b00c3d5 FT |
2558 | #ifdef REAL_DMA |
2559 | hostdata->dma_len = 0; | |
2560 | #endif | |
8b00c3d5 FT |
2561 | if (do_abort(instance)) { |
2562 | set_host_byte(cmd, DID_ERROR); | |
2563 | complete_cmd(instance, cmd); | |
2564 | result = FAILED; | |
2565 | goto out; | |
2566 | } | |
2567 | set_host_byte(cmd, DID_ABORT); | |
dc183965 FT |
2568 | complete_cmd(instance, cmd); |
2569 | goto out; | |
2570 | } | |
2571 | ||
2572 | if (list_del_cmd(&hostdata->autosense, cmd)) { | |
2573 | dsprintk(NDEBUG_ABORT, instance, | |
2574 | "abort: removed %p from sense queue\n", cmd); | |
2575 | set_host_byte(cmd, DID_ERROR); | |
8b00c3d5 FT |
2576 | complete_cmd(instance, cmd); |
2577 | } | |
2578 | ||
2579 | out: | |
2580 | if (result == FAILED) | |
2581 | dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd); | |
2582 | else | |
2583 | dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); | |
2584 | ||
2585 | queue_work(hostdata->work_q, &hostdata->main_task); | |
2586 | maybe_release_dma_irq(instance); | |
11d2f63b | 2587 | spin_unlock_irqrestore(&hostdata->lock, flags); |
e3c3da67 | 2588 | |
8b00c3d5 | 2589 | return result; |
1da177e4 LT |
2590 | } |
2591 | ||
2592 | ||
3be1b3ea FT |
2593 | /** |
2594 | * NCR5380_bus_reset - reset the SCSI bus | |
2595 | * @cmd: SCSI command undergoing EH | |
1da177e4 | 2596 | * |
3be1b3ea | 2597 | * Returns SUCCESS |
c28bda25 | 2598 | */ |
1da177e4 | 2599 | |
710ddd0d | 2600 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2601 | { |
e3c3da67 FT |
2602 | struct Scsi_Host *instance = cmd->device->host; |
2603 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2604 | int i; |
2605 | unsigned long flags; | |
62717f53 | 2606 | struct NCR5380_cmd *ncmd; |
1da177e4 | 2607 | |
11d2f63b | 2608 | spin_lock_irqsave(&hostdata->lock, flags); |
3be1b3ea FT |
2609 | |
2610 | #if (NDEBUG & NDEBUG_ANY) | |
62717f53 | 2611 | scmd_printk(KERN_INFO, cmd, __func__); |
3be1b3ea | 2612 | #endif |
e5c3fddf FT |
2613 | NCR5380_dprint(NDEBUG_ANY, instance); |
2614 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
3be1b3ea FT |
2615 | |
2616 | do_reset(instance); | |
c28bda25 | 2617 | |
c28bda25 | 2618 | /* reset NCR registers */ |
c28bda25 RZ |
2619 | NCR5380_write(MODE_REG, MR_BASE); |
2620 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2621 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
c28bda25 | 2622 | |
c28bda25 RZ |
2623 | /* After the reset, there are no more connected or disconnected commands |
2624 | * and no busy units; so clear the low-level status here to avoid | |
2625 | * conflicts when the mid-level code tries to wake up the affected | |
2626 | * commands! | |
2627 | */ | |
2628 | ||
1884c283 FT |
2629 | if (list_del_cmd(&hostdata->unissued, cmd)) { |
2630 | cmd->result = DID_RESET << 16; | |
2631 | cmd->scsi_done(cmd); | |
2632 | } | |
2633 | ||
2634 | if (hostdata->selecting) { | |
2635 | hostdata->selecting->result = DID_RESET << 16; | |
2636 | complete_cmd(instance, hostdata->selecting); | |
2637 | hostdata->selecting = NULL; | |
2638 | } | |
707d62b3 | 2639 | |
62717f53 FT |
2640 | list_for_each_entry(ncmd, &hostdata->disconnected, list) { |
2641 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
32b26a10 | 2642 | |
62717f53 FT |
2643 | set_host_byte(cmd, DID_RESET); |
2644 | cmd->scsi_done(cmd); | |
f27db8eb | 2645 | } |
1884c283 | 2646 | INIT_LIST_HEAD(&hostdata->disconnected); |
f27db8eb | 2647 | |
62717f53 FT |
2648 | list_for_each_entry(ncmd, &hostdata->autosense, list) { |
2649 | struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); | |
f27db8eb | 2650 | |
62717f53 FT |
2651 | set_host_byte(cmd, DID_RESET); |
2652 | cmd->scsi_done(cmd); | |
2653 | } | |
1884c283 | 2654 | INIT_LIST_HEAD(&hostdata->autosense); |
32b26a10 | 2655 | |
62717f53 FT |
2656 | if (hostdata->connected) { |
2657 | set_host_byte(hostdata->connected, DID_RESET); | |
2658 | complete_cmd(instance, hostdata->connected); | |
2659 | hostdata->connected = NULL; | |
2660 | } | |
2661 | ||
1da177e4 | 2662 | #ifdef SUPPORT_TAGS |
ca513fc9 | 2663 | free_all_tags(hostdata); |
1da177e4 | 2664 | #endif |
c28bda25 RZ |
2665 | for (i = 0; i < 8; ++i) |
2666 | hostdata->busy[i] = 0; | |
1da177e4 | 2667 | #ifdef REAL_DMA |
c28bda25 | 2668 | hostdata->dma_len = 0; |
1da177e4 | 2669 | #endif |
e3c3da67 | 2670 | |
62717f53 | 2671 | queue_work(hostdata->work_q, &hostdata->main_task); |
e3c3da67 | 2672 | maybe_release_dma_irq(instance); |
11d2f63b | 2673 | spin_unlock_irqrestore(&hostdata->lock, flags); |
1da177e4 | 2674 | |
2b0f834c | 2675 | return SUCCESS; |
1da177e4 | 2676 | } |