Commit | Line | Data |
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c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * For more information, please consult |
1da177e4 LT |
15 | * |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
28 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
29 | * this file, too: | |
30 | * | |
31 | * - Some of the debug statements were incorrect (undefined variables and the | |
32 | * like). I fixed that. | |
33 | * | |
34 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
35 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
36 | * in the #if statement. | |
37 | * | |
38 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
39 | * phase after starting the DMA. It has nothing more to do. | |
40 | * | |
41 | * - The interrupt service routine should run main after end of DMA, too (not | |
42 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
43 | * for more interrupts after running main, since a DMA process may have | |
44 | * been started and interrupts are turned on now. The new int could happen | |
45 | * inside the execution of NCR5380_intr(), leading to recursive | |
46 | * calls. | |
47 | * | |
48 | * - I've added a function merge_contiguous_buffers() that tries to | |
49 | * merge scatter-gather buffers that are located at contiguous | |
50 | * physical addresses and can be processed with the same DMA setup. | |
51 | * Since most scatter-gather operations work on a page (4K) of | |
52 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
53 | * DMA setup actions are saved. | |
54 | * | |
55 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
56 | * and USLEEP, because these were messing up readability and will never be | |
57 | * needed for Atari SCSI. | |
c28bda25 | 58 | * |
1da177e4 LT |
59 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
60 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
61 | * interrupt. | |
62 | * | |
63 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
64 | * constructs. In my eyes, this made the source rather unreadable, so I | |
65 | * finally replaced that by the *_PRINTK() macros. | |
66 | * | |
67 | */ | |
68 | ||
69 | /* | |
c28bda25 RZ |
70 | * Further development / testing that should be done : |
71 | * 1. Test linked command handling code after Eric is ready with | |
1da177e4 LT |
72 | * the high level code. |
73 | */ | |
e3f463b0 FT |
74 | |
75 | /* Adapted for the sun3 by Sam Creasey. */ | |
76 | ||
db9dff36 | 77 | #include <scsi/scsi_dbg.h> |
1abfd370 | 78 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
79 | |
80 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 RZ |
81 | #define LIST(x, y) \ |
82 | do { \ | |
83 | printk("LINE:%d Adding %p to %p\n", \ | |
84 | __LINE__, (void*)(x), (void*)(y)); \ | |
85 | if ((x) == (y)) \ | |
86 | udelay(5); \ | |
87 | } while (0) | |
88 | #define REMOVE(w, x, y, z) \ | |
89 | do { \ | |
90 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
91 | __LINE__, (void*)(w), (void*)(x), \ | |
92 | (void*)(y), (void*)(z)); \ | |
93 | if ((x) == (y)) \ | |
94 | udelay(5); \ | |
95 | } while (0) | |
1da177e4 LT |
96 | #else |
97 | #define LIST(x,y) | |
98 | #define REMOVE(w,x,y,z) | |
99 | #endif | |
100 | ||
101 | #ifndef notyet | |
102 | #undef LINKED | |
103 | #endif | |
104 | ||
105 | /* | |
106 | * Design | |
1da177e4 | 107 | * |
c28bda25 | 108 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 109 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 110 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
111 | * memory mapped) and drops this file in their 'C' wrapper. |
112 | * | |
c28bda25 | 113 | * As far as command queueing, two queues are maintained for |
1da177e4 | 114 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
115 | * and commands that are currently executing. This means that an |
116 | * unlimited number of commands may be queued, letting | |
117 | * more commands propagate from the higher driver levels giving higher | |
118 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
119 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
120 | * while a command is already executing. |
121 | * | |
1da177e4 | 122 | * |
c28bda25 | 123 | * Issues specific to the NCR5380 : |
1da177e4 | 124 | * |
c28bda25 RZ |
125 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
126 | * piece of hardware that requires you to sit in a loop polling for | |
127 | * the REQ signal as long as you are connected. Some devices are | |
128 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
1da177e4 | 129 | * while doing long seek operations. |
c28bda25 | 130 | * |
1da177e4 LT |
131 | * The workaround for this is to keep track of devices that have |
132 | * disconnected. If the device hasn't disconnected, for commands that | |
c28bda25 | 133 | * should disconnect, we do something like |
1da177e4 LT |
134 | * |
135 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
c28bda25 RZ |
136 | * |
137 | * Some tweaking of N and M needs to be done. An algorithm based | |
1da177e4 | 138 | * on "time to data" would give the best results as long as short time |
c28bda25 | 139 | * to datas (ie, on the same track) were considered, however these |
1da177e4 LT |
140 | * broken devices are the exception rather than the rule and I'd rather |
141 | * spend my time optimizing for the normal case. | |
142 | * | |
143 | * Architecture : | |
144 | * | |
145 | * At the heart of the design is a coroutine, NCR5380_main, | |
ff50f9ed FT |
146 | * which is started from a workqueue for each NCR5380 host in the |
147 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by | |
148 | * removing the commands from the issue queue and calling | |
149 | * NCR5380_select() if a nexus is not established. | |
1da177e4 LT |
150 | * |
151 | * Once a nexus is established, the NCR5380_information_transfer() | |
152 | * phase goes through the various phases as instructed by the target. | |
153 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
154 | * the command structure is placed into the per instance disconnected | |
ff50f9ed FT |
155 | * queue, and NCR5380_main tries to find more work. If the target is |
156 | * idle for too long, the system will try to sleep. | |
1da177e4 LT |
157 | * |
158 | * If a command has disconnected, eventually an interrupt will trigger, | |
159 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
160 | * to reestablish a nexus. This will run main if necessary. | |
161 | * | |
c28bda25 | 162 | * On command termination, the done function will be called as |
1da177e4 LT |
163 | * appropriate. |
164 | * | |
c28bda25 | 165 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
166 | * structures, being initialized after the command is connected |
167 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
168 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
169 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
170 | */ | |
171 | ||
172 | /* | |
173 | * Using this file : | |
174 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 175 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
176 | * and macros and include this file in your driver. |
177 | * | |
c28bda25 | 178 | * These macros control options : |
1da177e4 | 179 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 180 | * for commands that return with a CHECK CONDITION status. |
1da177e4 | 181 | * |
ff50f9ed FT |
182 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
183 | * transceivers. | |
184 | * | |
1da177e4 LT |
185 | * LINKED - if defined, linked commands are supported. |
186 | * | |
187 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
188 | * | |
189 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
190 | * | |
191 | * These macros MUST be defined : | |
c28bda25 | 192 | * |
1da177e4 LT |
193 | * NCR5380_read(register) - read from the specified register |
194 | * | |
c28bda25 | 195 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 | 196 | * |
ff50f9ed FT |
197 | * NCR5380_implementation_fields - additional fields needed for this |
198 | * specific implementation of the NCR5380 | |
199 | * | |
1da177e4 | 200 | * Either real DMA *or* pseudo DMA may be implemented |
c28bda25 | 201 | * REAL functions : |
1da177e4 | 202 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 203 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
204 | * that they were able to program the controller for. |
205 | * | |
c28bda25 | 206 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
207 | * available as NCR5380_i386_dma_write_setup, |
208 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
209 | * | |
210 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
211 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
212 | * NCR5380_dma_residual(instance); - residual count | |
213 | * | |
214 | * PSEUDO functions : | |
215 | * NCR5380_pwrite(instance, src, count) | |
216 | * NCR5380_pread(instance, dst, count); | |
217 | * | |
1da177e4 | 218 | * The generic driver is initialized by calling NCR5380_init(instance), |
c28bda25 | 219 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 220 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 221 | * possible) function may be used. |
1da177e4 LT |
222 | */ |
223 | ||
224 | static struct Scsi_Host *first_instance = NULL; | |
d0be4a7d | 225 | static struct scsi_host_template *the_template = NULL; |
1da177e4 LT |
226 | |
227 | /* Macros ease life... :-) */ | |
228 | #define SETUP_HOSTDATA(in) \ | |
229 | struct NCR5380_hostdata *hostdata = \ | |
230 | (struct NCR5380_hostdata *)(in)->hostdata | |
231 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
232 | ||
710ddd0d | 233 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 234 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 235 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
236 | |
237 | #define HOSTNO instance->host_no | |
238 | #define H_NO(cmd) (cmd)->device->host->host_no | |
239 | ||
240 | #ifdef SUPPORT_TAGS | |
241 | ||
242 | /* | |
243 | * Functions for handling tagged queuing | |
244 | * ===================================== | |
245 | * | |
246 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
247 | * | |
248 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
249 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
250 | * command has been preempted for a long time. My solution: a bitfield for | |
251 | * remembering used tags. | |
252 | * | |
253 | * There's also the problem that each target has a certain queue size, but we | |
254 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
255 | * returned. So, in this case, the driver internal queue size assumption is | |
256 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
257 | * target. The command is returned to the mid-level, but with status changed | |
258 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL | |
259 | * correctly. | |
260 | * | |
261 | * We're also not allowed running tagged commands as long as an untagged | |
262 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
263 | * condition _must_ be untagged. To keep track whether an untagged command has | |
264 | * been issued, the host->busy array is still employed, as it is without | |
265 | * support for tagged queuing. | |
266 | * | |
267 | * One could suspect that there are possible race conditions between | |
268 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
269 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
270 | * which already guaranteed to be running at most once. It is also the only | |
271 | * place where tags/LUNs are allocated. So no other allocation can slip | |
272 | * between that pair, there could only happen a reselection, which can free a | |
273 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
274 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
275 | */ | |
276 | ||
1da177e4 | 277 | typedef struct { |
c28bda25 RZ |
278 | DECLARE_BITMAP(allocated, MAX_TAGS); |
279 | int nr_allocated; | |
280 | int queue_size; | |
1da177e4 LT |
281 | } TAG_ALLOC; |
282 | ||
c28bda25 | 283 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
1da177e4 LT |
284 | |
285 | ||
ca513fc9 | 286 | static void __init init_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 287 | { |
c28bda25 RZ |
288 | int target, lun; |
289 | TAG_ALLOC *ta; | |
290 | ||
ca513fc9 | 291 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
292 | return; |
293 | ||
294 | for (target = 0; target < 8; ++target) { | |
295 | for (lun = 0; lun < 8; ++lun) { | |
296 | ta = &TagAlloc[target][lun]; | |
297 | bitmap_zero(ta->allocated, MAX_TAGS); | |
298 | ta->nr_allocated = 0; | |
299 | /* At the beginning, assume the maximum queue size we could | |
300 | * support (MAX_TAGS). This value will be decreased if the target | |
301 | * returns QUEUE_FULL status. | |
302 | */ | |
303 | ta->queue_size = MAX_TAGS; | |
304 | } | |
1da177e4 | 305 | } |
1da177e4 LT |
306 | } |
307 | ||
308 | ||
309 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
310 | * busy by an untagged command. If the command should use tagged queuing, also | |
311 | * check that there is a free tag and the target's queue won't overflow. This | |
312 | * function should be called with interrupts disabled to avoid race | |
313 | * conditions. | |
c28bda25 | 314 | */ |
1da177e4 | 315 | |
710ddd0d | 316 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 317 | { |
9cb78c16 | 318 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
319 | SETUP_HOSTDATA(cmd->device->host); |
320 | ||
9cb78c16 | 321 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
322 | return 1; |
323 | if (!should_be_tagged || | |
ca513fc9 FT |
324 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
325 | !cmd->device->tagged_supported) | |
c28bda25 | 326 | return 0; |
9cb78c16 HR |
327 | if (TagAlloc[cmd->device->id][lun].nr_allocated >= |
328 | TagAlloc[cmd->device->id][lun].queue_size) { | |
d65e634a | 329 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
9cb78c16 | 330 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
331 | return 1; |
332 | } | |
333 | return 0; | |
1da177e4 LT |
334 | } |
335 | ||
336 | ||
337 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
338 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
339 | * untagged. | |
340 | */ | |
341 | ||
710ddd0d | 342 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 343 | { |
9cb78c16 | 344 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
345 | SETUP_HOSTDATA(cmd->device->host); |
346 | ||
347 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
348 | * an untagged command. | |
349 | */ | |
350 | if (!should_be_tagged || | |
ca513fc9 FT |
351 | !(hostdata->flags & FLAG_TAGGED_QUEUING) || |
352 | !cmd->device->tagged_supported) { | |
c28bda25 | 353 | cmd->tag = TAG_NONE; |
9cb78c16 | 354 | hostdata->busy[cmd->device->id] |= (1 << lun); |
d65e634a | 355 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
9cb78c16 | 356 | "command\n", H_NO(cmd), cmd->device->id, lun); |
c28bda25 | 357 | } else { |
9cb78c16 | 358 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][lun]; |
c28bda25 RZ |
359 | |
360 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
361 | set_bit(cmd->tag, ta->allocated); | |
362 | ta->nr_allocated++; | |
d65e634a | 363 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
c28bda25 RZ |
364 | "(now %d tags in use)\n", |
365 | H_NO(cmd), cmd->tag, cmd->device->id, | |
9cb78c16 | 366 | lun, ta->nr_allocated); |
c28bda25 | 367 | } |
1da177e4 LT |
368 | } |
369 | ||
370 | ||
371 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
372 | * unlock the LUN. | |
373 | */ | |
374 | ||
710ddd0d | 375 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 376 | { |
9cb78c16 | 377 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
378 | SETUP_HOSTDATA(cmd->device->host); |
379 | ||
380 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 381 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
d65e634a | 382 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
9cb78c16 | 383 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
384 | } else if (cmd->tag >= MAX_TAGS) { |
385 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
386 | H_NO(cmd), cmd->tag); | |
387 | } else { | |
9cb78c16 | 388 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][lun]; |
c28bda25 RZ |
389 | clear_bit(cmd->tag, ta->allocated); |
390 | ta->nr_allocated--; | |
d65e634a | 391 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
9cb78c16 | 392 | H_NO(cmd), cmd->tag, cmd->device->id, lun); |
c28bda25 | 393 | } |
1da177e4 LT |
394 | } |
395 | ||
396 | ||
ca513fc9 | 397 | static void free_all_tags(struct NCR5380_hostdata *hostdata) |
1da177e4 | 398 | { |
c28bda25 RZ |
399 | int target, lun; |
400 | TAG_ALLOC *ta; | |
401 | ||
ca513fc9 | 402 | if (!(hostdata->flags & FLAG_TAGGED_QUEUING)) |
c28bda25 RZ |
403 | return; |
404 | ||
405 | for (target = 0; target < 8; ++target) { | |
406 | for (lun = 0; lun < 8; ++lun) { | |
407 | ta = &TagAlloc[target][lun]; | |
408 | bitmap_zero(ta->allocated, MAX_TAGS); | |
409 | ta->nr_allocated = 0; | |
410 | } | |
1da177e4 | 411 | } |
1da177e4 LT |
412 | } |
413 | ||
414 | #endif /* SUPPORT_TAGS */ | |
415 | ||
416 | ||
417 | /* | |
710ddd0d | 418 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
419 | * |
420 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
421 | * transfer. This is possible if the scatter buffers lie on | |
422 | * physical contiguous addresses. | |
423 | * | |
710ddd0d | 424 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 425 | * The command to work on. The first scatter buffer's data are |
25985edc | 426 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
427 | */ |
428 | ||
710ddd0d | 429 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 430 | { |
e3f463b0 | 431 | #if !defined(CONFIG_SUN3) |
c28bda25 | 432 | unsigned long endaddr; |
1da177e4 | 433 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
434 | unsigned long oldlen = cmd->SCp.this_residual; |
435 | int cnt = 1; | |
1da177e4 LT |
436 | #endif |
437 | ||
c28bda25 RZ |
438 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
439 | cmd->SCp.buffers_residual && | |
5a1cb47f | 440 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 441 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 442 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 443 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 444 | ++cnt; |
1da177e4 | 445 | #endif |
c28bda25 RZ |
446 | ++cmd->SCp.buffer; |
447 | --cmd->SCp.buffers_residual; | |
448 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
449 | endaddr += cmd->SCp.buffer->length; | |
450 | } | |
1da177e4 | 451 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 452 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 453 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 454 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 | 455 | #endif |
e3f463b0 | 456 | #endif /* !defined(CONFIG_SUN3) */ |
1da177e4 LT |
457 | } |
458 | ||
ff50f9ed FT |
459 | /** |
460 | * initialize_SCp - init the scsi pointer field | |
461 | * @cmd: command block to set up | |
1da177e4 | 462 | * |
ff50f9ed | 463 | * Set up the internal fields in the SCSI command. |
1da177e4 LT |
464 | */ |
465 | ||
710ddd0d | 466 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 467 | { |
c28bda25 RZ |
468 | /* |
469 | * Initialize the Scsi Pointer field so that all of the commands in the | |
470 | * various queues are valid. | |
1da177e4 | 471 | */ |
c28bda25 | 472 | |
9e0fe44d BH |
473 | if (scsi_bufflen(cmd)) { |
474 | cmd->SCp.buffer = scsi_sglist(cmd); | |
475 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 476 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
477 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
478 | /* ++roman: Try to merge some scatter-buffers if they are at | |
479 | * contiguous physical addresses. | |
480 | */ | |
481 | merge_contiguous_buffers(cmd); | |
482 | } else { | |
483 | cmd->SCp.buffer = NULL; | |
484 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
485 | cmd->SCp.ptr = NULL; |
486 | cmd->SCp.this_residual = 0; | |
c28bda25 | 487 | } |
1da177e4 LT |
488 | } |
489 | ||
1da177e4 LT |
490 | #include <linux/delay.h> |
491 | ||
492 | #if NDEBUG | |
493 | static struct { | |
c28bda25 RZ |
494 | unsigned char mask; |
495 | const char *name; | |
496 | } signals[] = { | |
497 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
498 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
499 | { SR_SEL, "SEL" }, {0, NULL} | |
500 | }, basrs[] = { | |
501 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
502 | }, icrs[] = { | |
503 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
504 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
505 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
506 | {0, NULL} | |
507 | }, mrs[] = { | |
508 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
509 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
510 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
511 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
512 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
513 | {0, NULL} | |
514 | }; | |
1da177e4 | 515 | |
ff50f9ed FT |
516 | /** |
517 | * NCR5380_print - print scsi bus signals | |
518 | * @instance: adapter state to dump | |
1da177e4 | 519 | * |
ff50f9ed | 520 | * Print the SCSI bus signals for debugging purposes |
1da177e4 LT |
521 | */ |
522 | ||
c28bda25 RZ |
523 | static void NCR5380_print(struct Scsi_Host *instance) |
524 | { | |
525 | unsigned char status, data, basr, mr, icr, i; | |
526 | unsigned long flags; | |
527 | ||
528 | local_irq_save(flags); | |
529 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
530 | status = NCR5380_read(STATUS_REG); | |
531 | mr = NCR5380_read(MODE_REG); | |
532 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
533 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
534 | local_irq_restore(flags); | |
535 | printk("STATUS_REG: %02x ", status); | |
536 | for (i = 0; signals[i].mask; ++i) | |
537 | if (status & signals[i].mask) | |
538 | printk(",%s", signals[i].name); | |
539 | printk("\nBASR: %02x ", basr); | |
540 | for (i = 0; basrs[i].mask; ++i) | |
541 | if (basr & basrs[i].mask) | |
542 | printk(",%s", basrs[i].name); | |
543 | printk("\nICR: %02x ", icr); | |
544 | for (i = 0; icrs[i].mask; ++i) | |
545 | if (icr & icrs[i].mask) | |
546 | printk(",%s", icrs[i].name); | |
547 | printk("\nMODE: %02x ", mr); | |
548 | for (i = 0; mrs[i].mask; ++i) | |
549 | if (mr & mrs[i].mask) | |
550 | printk(",%s", mrs[i].name); | |
551 | printk("\n"); | |
1da177e4 LT |
552 | } |
553 | ||
554 | static struct { | |
c28bda25 RZ |
555 | unsigned char value; |
556 | const char *name; | |
1da177e4 | 557 | } phases[] = { |
c28bda25 RZ |
558 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
559 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
560 | {PHASE_UNKNOWN, "UNKNOWN"} | |
561 | }; | |
1da177e4 | 562 | |
ff50f9ed FT |
563 | /** |
564 | * NCR5380_print_phase - show SCSI phase | |
565 | * @instance: adapter to dump | |
1da177e4 | 566 | * |
ff50f9ed | 567 | * Print the current SCSI phase for debugging purposes |
1da177e4 | 568 | * |
ff50f9ed | 569 | * Locks: none |
1da177e4 LT |
570 | */ |
571 | ||
572 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
573 | { | |
c28bda25 RZ |
574 | unsigned char status; |
575 | int i; | |
576 | ||
577 | status = NCR5380_read(STATUS_REG); | |
578 | if (!(status & SR_REQ)) | |
579 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
580 | else { | |
581 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
582 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
583 | ; | |
584 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
585 | } | |
1da177e4 LT |
586 | } |
587 | ||
1da177e4 LT |
588 | #endif |
589 | ||
590 | /* | |
591 | * ++roman: New scheme of calling NCR5380_main() | |
c28bda25 | 592 | * |
1da177e4 LT |
593 | * If we're not in an interrupt, we can call our main directly, it cannot be |
594 | * already running. Else, we queue it on a task queue, if not 'main_running' | |
595 | * tells us that a lower level is already executing it. This way, | |
596 | * 'main_running' needs not be protected in a special way. | |
597 | * | |
598 | * queue_main() is a utility function for putting our main onto the task | |
599 | * queue, if main_running is false. It should be called only from a | |
600 | * interrupt or bottom half. | |
601 | */ | |
602 | ||
5a0e3ad6 | 603 | #include <linux/gfp.h> |
1da177e4 LT |
604 | #include <linux/workqueue.h> |
605 | #include <linux/interrupt.h> | |
606 | ||
c28bda25 | 607 | static volatile int main_running; |
b312b38c | 608 | static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); |
1da177e4 | 609 | |
c28bda25 | 610 | static inline void queue_main(void) |
1da177e4 | 611 | { |
c28bda25 RZ |
612 | if (!main_running) { |
613 | /* If in interrupt and NCR5380_main() not already running, | |
614 | queue it on the 'immediate' task queue, to be processed | |
615 | immediately after the current interrupt processing has | |
616 | finished. */ | |
617 | schedule_work(&NCR5380_tqueue); | |
618 | } | |
619 | /* else: nothing to do: the running NCR5380_main() will pick up | |
620 | any newly queued command. */ | |
1da177e4 LT |
621 | } |
622 | ||
623 | ||
c28bda25 | 624 | static inline void NCR5380_all_init(void) |
1da177e4 | 625 | { |
c28bda25 RZ |
626 | static int done = 0; |
627 | if (!done) { | |
d65e634a | 628 | dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n"); |
c28bda25 RZ |
629 | done = 1; |
630 | } | |
1da177e4 LT |
631 | } |
632 | ||
8c32513b FT |
633 | /** |
634 | * NCR58380_info - report driver and host information | |
635 | * @instance: relevant scsi host instance | |
1da177e4 | 636 | * |
8c32513b | 637 | * For use as the host template info() handler. |
1da177e4 | 638 | * |
8c32513b | 639 | * Locks: none |
1da177e4 LT |
640 | */ |
641 | ||
8c32513b | 642 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 643 | { |
8c32513b FT |
644 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
645 | ||
646 | return hostdata->info; | |
647 | } | |
648 | ||
649 | static void prepare_info(struct Scsi_Host *instance) | |
650 | { | |
651 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
652 | ||
653 | snprintf(hostdata->info, sizeof(hostdata->info), | |
654 | "%s, io_port 0x%lx, n_io_port %d, " | |
655 | "base 0x%lx, irq %d, " | |
656 | "can_queue %d, cmd_per_lun %d, " | |
657 | "sg_tablesize %d, this_id %d, " | |
ca513fc9 | 658 | "flags { %s}, " |
8c32513b FT |
659 | "options { %s} ", |
660 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
661 | instance->base, instance->irq, | |
662 | instance->can_queue, instance->cmd_per_lun, | |
663 | instance->sg_tablesize, instance->this_id, | |
ca513fc9 | 664 | hostdata->flags & FLAG_TAGGED_QUEUING ? "TAGGED_QUEUING " : "", |
8c32513b FT |
665 | #ifdef DIFFERENTIAL |
666 | "DIFFERENTIAL " | |
667 | #endif | |
1da177e4 | 668 | #ifdef REAL_DMA |
8c32513b | 669 | "REAL_DMA " |
1da177e4 LT |
670 | #endif |
671 | #ifdef PARITY | |
8c32513b | 672 | "PARITY " |
1da177e4 LT |
673 | #endif |
674 | #ifdef SUPPORT_TAGS | |
8c32513b | 675 | "SUPPORT_TAGS " |
1da177e4 | 676 | #endif |
8c32513b | 677 | ""); |
1da177e4 LT |
678 | } |
679 | ||
ff50f9ed FT |
680 | /** |
681 | * NCR5380_print_status - dump controller info | |
682 | * @instance: controller to dump | |
1da177e4 | 683 | * |
ff50f9ed FT |
684 | * Print commands in the various queues, called from NCR5380_abort |
685 | * to aid debugging. | |
1da177e4 LT |
686 | */ |
687 | ||
710ddd0d | 688 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd) |
1da177e4 | 689 | { |
d89537e1 AV |
690 | int i, s; |
691 | unsigned char *command; | |
9cb78c16 | 692 | printk("scsi%d: destination target %d, lun %llu\n", |
d89537e1 AV |
693 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
694 | printk(KERN_CONT " command = "); | |
695 | command = cmd->cmnd; | |
696 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
697 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
698 | printk(KERN_CONT " %02x", command[i]); | |
699 | printk("\n"); | |
1da177e4 LT |
700 | } |
701 | ||
d89537e1 | 702 | static void NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 703 | { |
c28bda25 | 704 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 705 | struct scsi_cmnd *ptr; |
c28bda25 | 706 | unsigned long flags; |
d89537e1 | 707 | |
8ad3a593 FT |
708 | NCR5380_dprint(NDEBUG_ANY, instance); |
709 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
c28bda25 RZ |
710 | |
711 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
712 | ||
c28bda25 | 713 | local_irq_save(flags); |
d89537e1 | 714 | printk("NCR5380: coroutine is%s running.\n", |
c28bda25 | 715 | main_running ? "" : "n't"); |
c28bda25 | 716 | if (!hostdata->connected) |
d89537e1 | 717 | printk("scsi%d: no currently connected command\n", HOSTNO); |
c28bda25 | 718 | else |
710ddd0d | 719 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected); |
d89537e1 | 720 | printk("scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 721 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 | 722 | lprint_Scsi_Cmnd(ptr); |
1da177e4 | 723 | |
d89537e1 | 724 | printk("scsi%d: disconnected_queue\n", HOSTNO); |
710ddd0d | 725 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
726 | ptr = NEXT(ptr)) |
727 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 728 | |
c28bda25 | 729 | local_irq_restore(flags); |
d89537e1 | 730 | printk("\n"); |
1da177e4 LT |
731 | } |
732 | ||
710ddd0d | 733 | static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 734 | { |
c28bda25 RZ |
735 | int i, s; |
736 | unsigned char *command; | |
9cb78c16 | 737 | seq_printf(m, "scsi%d: destination target %d, lun %llu\n", |
c28bda25 | 738 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
d89537e1 | 739 | seq_printf(m, " command = "); |
c28bda25 | 740 | command = cmd->cmnd; |
d89537e1 | 741 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); |
c28bda25 | 742 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
d89537e1 AV |
743 | seq_printf(m, " %02x", command[i]); |
744 | seq_printf(m, "\n"); | |
1da177e4 LT |
745 | } |
746 | ||
4d3d2a54 FT |
747 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
748 | struct Scsi_Host *instance) | |
d89537e1 AV |
749 | { |
750 | struct NCR5380_hostdata *hostdata; | |
710ddd0d | 751 | struct scsi_cmnd *ptr; |
d89537e1 AV |
752 | unsigned long flags; |
753 | ||
754 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
755 | ||
d89537e1 AV |
756 | local_irq_save(flags); |
757 | seq_printf(m, "NCR5380: coroutine is%s running.\n", | |
758 | main_running ? "" : "n't"); | |
759 | if (!hostdata->connected) | |
760 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
761 | else | |
710ddd0d | 762 | show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
d89537e1 | 763 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 764 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 AV |
765 | show_Scsi_Cmnd(ptr, m); |
766 | ||
767 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
710ddd0d | 768 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
769 | ptr = NEXT(ptr)) |
770 | show_Scsi_Cmnd(ptr, m); | |
771 | ||
772 | local_irq_restore(flags); | |
773 | return 0; | |
774 | } | |
1da177e4 | 775 | |
ff50f9ed FT |
776 | /** |
777 | * NCR5380_init - initialise an NCR5380 | |
778 | * @instance: adapter to configure | |
779 | * @flags: control flags | |
1da177e4 | 780 | * |
ff50f9ed FT |
781 | * Initializes *instance and corresponding 5380 chip, |
782 | * with flags OR'd into the initial flags value. | |
1da177e4 LT |
783 | * |
784 | * Notes : I assume that the host, hostno, and id bits have been | |
ff50f9ed | 785 | * set correctly. I don't care about the irq and other fields. |
c28bda25 | 786 | * |
ff50f9ed | 787 | * Returns 0 for success |
1da177e4 LT |
788 | */ |
789 | ||
95fde7a8 | 790 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 791 | { |
c28bda25 RZ |
792 | int i; |
793 | SETUP_HOSTDATA(instance); | |
794 | ||
795 | NCR5380_all_init(); | |
796 | ||
797 | hostdata->aborted = 0; | |
798 | hostdata->id_mask = 1 << instance->this_id; | |
799 | hostdata->id_higher_mask = 0; | |
800 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
801 | if (i > hostdata->id_mask) | |
802 | hostdata->id_higher_mask |= i; | |
803 | for (i = 0; i < 8; ++i) | |
804 | hostdata->busy[i] = 0; | |
1da177e4 | 805 | #ifdef SUPPORT_TAGS |
ca513fc9 | 806 | init_tags(hostdata); |
1da177e4 LT |
807 | #endif |
808 | #if defined (REAL_DMA) | |
c28bda25 | 809 | hostdata->dma_len = 0; |
1da177e4 | 810 | #endif |
c28bda25 RZ |
811 | hostdata->targets_present = 0; |
812 | hostdata->connected = NULL; | |
813 | hostdata->issue_queue = NULL; | |
814 | hostdata->disconnected_queue = NULL; | |
ef1081cb | 815 | hostdata->flags = flags; |
c28bda25 RZ |
816 | |
817 | if (!the_template) { | |
818 | the_template = instance->hostt; | |
819 | first_instance = instance; | |
820 | } | |
1da177e4 | 821 | |
8c32513b FT |
822 | prepare_info(instance); |
823 | ||
c28bda25 RZ |
824 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
825 | NCR5380_write(MODE_REG, MR_BASE); | |
826 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
827 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 828 | |
c28bda25 | 829 | return 0; |
1da177e4 LT |
830 | } |
831 | ||
ff50f9ed FT |
832 | /** |
833 | * NCR5380_exit - remove an NCR5380 | |
834 | * @instance: adapter to remove | |
835 | * | |
836 | * Assumes that no more work can be queued (e.g. by NCR5380_intr). | |
837 | */ | |
838 | ||
6323e4fe GU |
839 | static void NCR5380_exit(struct Scsi_Host *instance) |
840 | { | |
ff50f9ed | 841 | cancel_work_sync(&NCR5380_tqueue); |
6323e4fe GU |
842 | } |
843 | ||
ff50f9ed FT |
844 | /** |
845 | * NCR5380_queue_command - queue a command | |
846 | * @instance: the relevant SCSI adapter | |
847 | * @cmd: SCSI command | |
1da177e4 | 848 | * |
ff50f9ed FT |
849 | * cmd is added to the per instance issue_queue, with minor |
850 | * twiddling done to the host specific fields of cmd. If the | |
851 | * main coroutine is not running, it is restarted. | |
1da177e4 LT |
852 | */ |
853 | ||
16b29e75 FT |
854 | static int NCR5380_queue_command(struct Scsi_Host *instance, |
855 | struct scsi_cmnd *cmd) | |
1da177e4 | 856 | { |
16b29e75 | 857 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
710ddd0d | 858 | struct scsi_cmnd *tmp; |
c28bda25 | 859 | unsigned long flags; |
1da177e4 LT |
860 | |
861 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
862 | switch (cmd->cmnd[0]) { |
863 | case WRITE_6: | |
864 | case WRITE_10: | |
865 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | |
866 | H_NO(cmd)); | |
867 | cmd->result = (DID_ERROR << 16); | |
16b29e75 | 868 | cmd->scsi_done(cmd); |
c28bda25 RZ |
869 | return 0; |
870 | } | |
1da177e4 LT |
871 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
872 | ||
c28bda25 RZ |
873 | /* |
874 | * We use the host_scribble field as a pointer to the next command | |
875 | * in a queue | |
876 | */ | |
877 | ||
3130d905 | 878 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
879 | cmd->result = 0; |
880 | ||
881 | /* | |
882 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
883 | * commands are added to the head of the queue since any command will | |
884 | * clear the contingent allegiance condition that exists and the | |
885 | * sense data is only guaranteed to be valid while the condition exists. | |
886 | */ | |
887 | ||
c28bda25 RZ |
888 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
889 | * Otherwise a running NCR5380_main may steal the lock. | |
890 | * Lock before actually inserting due to fairness reasons explained in | |
891 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
892 | * to release the lock. | |
893 | * Stop timer for this command while waiting for the lock, or timeouts | |
894 | * may happen (and they really do), and it's no good if the command doesn't | |
895 | * appear in any of the queues. | |
896 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
897 | * because also a timer int can trigger an abort or reset, which would | |
898 | * alter queues and touch the lock. | |
899 | */ | |
e3c3da67 | 900 | if (!NCR5380_acquire_dma_irq(instance)) |
16b29e75 FT |
901 | return SCSI_MLQUEUE_HOST_BUSY; |
902 | ||
903 | local_irq_save(flags); | |
904 | ||
ff50f9ed FT |
905 | /* |
906 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
907 | * commands are added to the head of the queue since any command will | |
908 | * clear the contingent allegiance condition that exists and the | |
909 | * sense data is only guaranteed to be valid while the condition exists. | |
910 | */ | |
911 | ||
c28bda25 RZ |
912 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
913 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 914 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
915 | hostdata->issue_queue = cmd; |
916 | } else { | |
710ddd0d | 917 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
918 | NEXT(tmp); tmp = NEXT(tmp)) |
919 | ; | |
920 | LIST(cmd, tmp); | |
3130d905 | 921 | SET_NEXT(tmp, cmd); |
c28bda25 RZ |
922 | } |
923 | local_irq_restore(flags); | |
924 | ||
d65e634a | 925 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
c28bda25 RZ |
926 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
927 | ||
928 | /* If queue_command() is called from an interrupt (real one or bottom | |
929 | * half), we let queue_main() do the job of taking care about main. If it | |
930 | * is already running, this is a no-op, else main will be queued. | |
931 | * | |
932 | * If we're not in an interrupt, we can call NCR5380_main() | |
933 | * unconditionally, because it cannot be already running. | |
934 | */ | |
16b29e75 | 935 | if (in_interrupt() || irqs_disabled()) |
c28bda25 RZ |
936 | queue_main(); |
937 | else | |
938 | NCR5380_main(NULL); | |
939 | return 0; | |
1da177e4 LT |
940 | } |
941 | ||
e3c3da67 FT |
942 | static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
943 | { | |
944 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
945 | ||
946 | /* Caller does the locking needed to set & test these data atomically */ | |
947 | if (!hostdata->disconnected_queue && | |
948 | !hostdata->issue_queue && | |
949 | !hostdata->connected && | |
950 | !hostdata->retain_dma_intr) | |
951 | NCR5380_release_dma_irq(instance); | |
952 | } | |
953 | ||
ff50f9ed FT |
954 | /** |
955 | * NCR5380_main - NCR state machines | |
1da177e4 | 956 | * |
ff50f9ed FT |
957 | * NCR5380_main is a coroutine that runs as long as more work can |
958 | * be done on the NCR5380 host adapters in a system. Both | |
959 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
960 | * in case it is not running. | |
c28bda25 | 961 | * |
ff50f9ed | 962 | * Locks: called as its own thread with no locks held. |
c28bda25 RZ |
963 | */ |
964 | ||
b312b38c | 965 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 966 | { |
710ddd0d | 967 | struct scsi_cmnd *tmp, *prev; |
c28bda25 RZ |
968 | struct Scsi_Host *instance = first_instance; |
969 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); | |
970 | int done; | |
971 | unsigned long flags; | |
972 | ||
973 | /* | |
974 | * We run (with interrupts disabled) until we're sure that none of | |
975 | * the host adapters have anything that can be done, at which point | |
976 | * we set main_running to 0 and exit. | |
977 | * | |
978 | * Interrupts are enabled before doing various other internal | |
979 | * instructions, after we've decided that we need to run through | |
980 | * the loop again. | |
981 | * | |
982 | * this should prevent any race conditions. | |
983 | * | |
984 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
985 | * because also a timer int can trigger an abort or reset, which can | |
986 | * alter queues and touch the Falcon lock. | |
987 | */ | |
988 | ||
989 | /* Tell int handlers main() is now already executing. Note that | |
990 | no races are possible here. If an int comes in before | |
991 | 'main_running' is set here, and queues/executes main via the | |
992 | task queue, it doesn't do any harm, just this instance of main | |
993 | won't find any work left to do. */ | |
994 | if (main_running) | |
995 | return; | |
996 | main_running = 1; | |
997 | ||
998 | local_save_flags(flags); | |
999 | do { | |
1000 | local_irq_disable(); /* Freeze request queues */ | |
1001 | done = 1; | |
1002 | ||
1003 | if (!hostdata->connected) { | |
d65e634a | 1004 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
1005 | /* |
1006 | * Search through the issue_queue for a command destined | |
1007 | * for a target that's not busy. | |
1008 | */ | |
1da177e4 | 1009 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 1010 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
1011 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
1012 | ; | |
1013 | /*printk("%p ", tmp);*/ | |
1014 | if ((tmp == prev) && tmp) | |
1015 | printk(" LOOP\n"); | |
1016 | /* else printk("\n"); */ | |
1da177e4 | 1017 | #endif |
710ddd0d | 1018 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 1019 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 1020 | u8 lun = tmp->device->lun; |
1da177e4 | 1021 | |
e3f463b0 FT |
1022 | dprintk(NDEBUG_LISTS, |
1023 | "MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
1024 | tmp, scmd_id(tmp), hostdata->busy[scmd_id(tmp)], | |
1025 | lun); | |
c28bda25 RZ |
1026 | /* When we find one, remove it from the issue queue. */ |
1027 | /* ++guenther: possible race with Falcon locking */ | |
1028 | if ( | |
1da177e4 | 1029 | #ifdef SUPPORT_TAGS |
c28bda25 | 1030 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 1031 | #else |
9cb78c16 | 1032 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 1033 | #endif |
c28bda25 RZ |
1034 | ) { |
1035 | /* ++guenther: just to be sure, this must be atomic */ | |
1036 | local_irq_disable(); | |
1037 | if (prev) { | |
1038 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 1039 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
1040 | } else { |
1041 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1042 | hostdata->issue_queue = NEXT(tmp); | |
1043 | } | |
3130d905 | 1044 | SET_NEXT(tmp, NULL); |
ef1081cb | 1045 | hostdata->retain_dma_intr++; |
c28bda25 RZ |
1046 | |
1047 | /* reenable interrupts after finding one */ | |
1048 | local_irq_restore(flags); | |
1049 | ||
1050 | /* | |
1051 | * Attempt to establish an I_T_L nexus here. | |
1052 | * On success, instance->hostdata->connected is set. | |
1053 | * On failure, we must add the command back to the | |
1054 | * issue queue so we can keep trying. | |
1055 | */ | |
d65e634a | 1056 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 1057 | "lun %d removed from issue_queue\n", |
9cb78c16 | 1058 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
1059 | /* |
1060 | * REQUEST SENSE commands are issued without tagged | |
1061 | * queueing, even on SCSI-II devices because the | |
1062 | * contingent allegiance condition exists for the | |
1063 | * entire unit. | |
1064 | */ | |
1065 | /* ++roman: ...and the standard also requires that | |
1066 | * REQUEST SENSE command are untagged. | |
1067 | */ | |
1068 | ||
1da177e4 | 1069 | #ifdef SUPPORT_TAGS |
c28bda25 | 1070 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1071 | #endif |
76f13b93 | 1072 | if (!NCR5380_select(instance, tmp)) { |
e3c3da67 | 1073 | local_irq_disable(); |
ef1081cb | 1074 | hostdata->retain_dma_intr--; |
c28bda25 | 1075 | /* release if target did not response! */ |
e3c3da67 FT |
1076 | maybe_release_dma_irq(instance); |
1077 | local_irq_restore(flags); | |
c28bda25 RZ |
1078 | break; |
1079 | } else { | |
1080 | local_irq_disable(); | |
1081 | LIST(tmp, hostdata->issue_queue); | |
3130d905 | 1082 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 1083 | hostdata->issue_queue = tmp; |
1da177e4 | 1084 | #ifdef SUPPORT_TAGS |
c28bda25 | 1085 | cmd_free_tag(tmp); |
1da177e4 | 1086 | #endif |
ef1081cb | 1087 | hostdata->retain_dma_intr--; |
c28bda25 | 1088 | local_irq_restore(flags); |
d65e634a | 1089 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 RZ |
1090 | "returned to issue_queue\n", HOSTNO); |
1091 | if (hostdata->connected) | |
1092 | break; | |
1093 | } | |
1094 | } /* if target/lun/target queue is not busy */ | |
1095 | } /* for issue_queue */ | |
1096 | } /* if (!hostdata->connected) */ | |
1097 | ||
1098 | if (hostdata->connected | |
1da177e4 | 1099 | #ifdef REAL_DMA |
c28bda25 | 1100 | && !hostdata->dma_len |
1da177e4 | 1101 | #endif |
c28bda25 RZ |
1102 | ) { |
1103 | local_irq_restore(flags); | |
d65e634a | 1104 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1105 | HOSTNO); |
1106 | NCR5380_information_transfer(instance); | |
d65e634a | 1107 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1108 | done = 0; |
1109 | } | |
1110 | } while (!done); | |
1da177e4 | 1111 | |
c28bda25 RZ |
1112 | /* Better allow ints _after_ 'main_running' has been cleared, else |
1113 | an interrupt could believe we'll pick up the work it left for | |
1114 | us, but we won't see it anymore here... */ | |
1115 | main_running = 0; | |
1116 | local_irq_restore(flags); | |
1da177e4 LT |
1117 | } |
1118 | ||
1119 | ||
1120 | #ifdef REAL_DMA | |
1121 | /* | |
1122 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1123 | * | |
1124 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1125 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1126 | * |
1127 | * Inputs : instance - this instance of the NCR5380. | |
1128 | * | |
1129 | */ | |
1130 | ||
c28bda25 | 1131 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1132 | { |
c28bda25 | 1133 | SETUP_HOSTDATA(instance); |
e3f463b0 FT |
1134 | int transfered; |
1135 | unsigned char **data; | |
c28bda25 | 1136 | volatile int *count; |
e3f463b0 FT |
1137 | int saved_data = 0, overrun = 0; |
1138 | unsigned char p; | |
c28bda25 RZ |
1139 | |
1140 | if (!hostdata->connected) { | |
1141 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | |
1142 | "no connected cmd\n", HOSTNO); | |
1143 | return; | |
1da177e4 | 1144 | } |
c28bda25 | 1145 | |
ef1081cb | 1146 | if (hostdata->read_overruns) { |
c28bda25 RZ |
1147 | p = hostdata->connected->SCp.phase; |
1148 | if (p & SR_IO) { | |
1149 | udelay(10); | |
1150 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1151 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1152 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1153 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1154 | overrun = 1; | |
d65e634a | 1155 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1156 | } |
1157 | } | |
1158 | } | |
1159 | ||
d65e634a | 1160 | dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
c28bda25 RZ |
1161 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
1162 | NCR5380_read(STATUS_REG)); | |
1163 | ||
e3f463b0 FT |
1164 | #if defined(CONFIG_SUN3) |
1165 | if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { | |
1166 | pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", | |
1167 | instance->host_no); | |
1168 | BUG(); | |
1169 | } | |
1170 | ||
1171 | /* make sure we're not stuck in a data phase */ | |
1172 | if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == | |
1173 | (BASR_PHASE_MATCH | BASR_ACK)) { | |
1174 | pr_err("scsi%d: BASR %02x\n", instance->host_no, | |
1175 | NCR5380_read(BUS_AND_STATUS_REG)); | |
1176 | pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", | |
1177 | instance->host_no); | |
1178 | BUG(); | |
1179 | } | |
1180 | #endif | |
1181 | ||
c28bda25 RZ |
1182 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1183 | NCR5380_write(MODE_REG, MR_BASE); | |
1184 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1185 | ||
1186 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); | |
1187 | hostdata->dma_len = 0; | |
1188 | ||
1189 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1190 | count = &hostdata->connected->SCp.this_residual; | |
1191 | *data += transfered; | |
1192 | *count -= transfered; | |
1193 | ||
ef1081cb | 1194 | if (hostdata->read_overruns) { |
e3f463b0 FT |
1195 | int cnt, toPIO; |
1196 | ||
c28bda25 | 1197 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
ef1081cb | 1198 | cnt = toPIO = hostdata->read_overruns; |
c28bda25 | 1199 | if (overrun) { |
d65e634a | 1200 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1201 | *(*data)++ = saved_data; |
1202 | (*count)--; | |
1203 | cnt--; | |
1204 | toPIO--; | |
1205 | } | |
d65e634a | 1206 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1207 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1208 | *count -= toPIO - cnt; | |
1209 | } | |
1da177e4 | 1210 | } |
1da177e4 LT |
1211 | } |
1212 | #endif /* REAL_DMA */ | |
1213 | ||
1214 | ||
ff50f9ed FT |
1215 | /** |
1216 | * NCR5380_intr - generic NCR5380 irq handler | |
1217 | * @irq: interrupt number | |
1218 | * @dev_id: device info | |
1da177e4 | 1219 | * |
ff50f9ed FT |
1220 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
1221 | * from the disconnected queue, and restarting NCR5380_main() | |
1222 | * as required. | |
1da177e4 LT |
1223 | */ |
1224 | ||
c28bda25 | 1225 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1226 | { |
c28bda25 RZ |
1227 | struct Scsi_Host *instance = first_instance; |
1228 | int done = 1, handled = 0; | |
1229 | unsigned char basr; | |
1230 | ||
d65e634a | 1231 | dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO); |
c28bda25 RZ |
1232 | |
1233 | /* Look for pending interrupts */ | |
1234 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
d65e634a | 1235 | dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr); |
c28bda25 RZ |
1236 | /* dispatch to appropriate routine if found and done=0 */ |
1237 | if (basr & BASR_IRQ) { | |
8ad3a593 | 1238 | NCR5380_dprint(NDEBUG_INTR, instance); |
c28bda25 RZ |
1239 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
1240 | done = 0; | |
d65e634a | 1241 | dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO); |
c28bda25 RZ |
1242 | NCR5380_reselect(instance); |
1243 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1244 | } else if (basr & BASR_PARITY_ERROR) { | |
d65e634a | 1245 | dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO); |
c28bda25 RZ |
1246 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1247 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
d65e634a | 1248 | dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO); |
c28bda25 RZ |
1249 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1250 | } else { | |
1251 | /* | |
1252 | * The rest of the interrupt conditions can occur only during a | |
1253 | * DMA transfer | |
1254 | */ | |
1da177e4 LT |
1255 | |
1256 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1257 | /* |
1258 | * We should only get PHASE MISMATCH and EOP interrupts if we have | |
1259 | * DMA enabled, so do a sanity check based on the current setting | |
1260 | * of the MODE register. | |
1261 | */ | |
1262 | ||
1263 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | |
1264 | ((basr & BASR_END_DMA_TRANSFER) || | |
1265 | !(basr & BASR_PHASE_MATCH))) { | |
1266 | ||
d65e634a | 1267 | dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
c28bda25 RZ |
1268 | NCR5380_dma_complete( instance ); |
1269 | done = 0; | |
c28bda25 | 1270 | } else |
1da177e4 | 1271 | #endif /* REAL_DMA */ |
c28bda25 | 1272 | { |
1da177e4 | 1273 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
c28bda25 | 1274 | if (basr & BASR_PHASE_MATCH) |
e3f463b0 | 1275 | dprintk(NDEBUG_INTR, "scsi%d: unknown interrupt, " |
c28bda25 RZ |
1276 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", |
1277 | HOSTNO, basr, NCR5380_read(MODE_REG), | |
1278 | NCR5380_read(STATUS_REG)); | |
1279 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
e3f463b0 FT |
1280 | #ifdef SUN3_SCSI_VME |
1281 | dregs->csr |= CSR_DMA_ENABLE; | |
1282 | #endif | |
c28bda25 RZ |
1283 | } |
1284 | } /* if !(SELECTION || PARITY) */ | |
1285 | handled = 1; | |
1286 | } /* BASR & IRQ */ else { | |
1287 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | |
1288 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | |
1289 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | |
1290 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
e3f463b0 FT |
1291 | #ifdef SUN3_SCSI_VME |
1292 | dregs->csr |= CSR_DMA_ENABLE; | |
1293 | #endif | |
c28bda25 RZ |
1294 | } |
1295 | ||
1296 | if (!done) { | |
d65e634a | 1297 | dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO); |
c28bda25 RZ |
1298 | /* Put a call to NCR5380_main() on the queue... */ |
1299 | queue_main(); | |
1300 | } | |
1301 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
1302 | } |
1303 | ||
c28bda25 | 1304 | /* |
710ddd0d FT |
1305 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1306 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1307 | * |
1308 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1309 | * including ARBITRATION, SELECTION, and initial message out for |
1310 | * IDENTIFY and queue messages. | |
1da177e4 | 1311 | * |
c28bda25 | 1312 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1313 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1314 | * |
1da177e4 | 1315 | * Returns : -1 if selection could not execute for some reason, |
c28bda25 RZ |
1316 | * 0 if selection succeeded or failed because the target |
1317 | * did not respond. | |
1da177e4 | 1318 | * |
c28bda25 RZ |
1319 | * Side effects : |
1320 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1321 | * with registers as they should have been on entry - ie |
1322 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1323 | * will cease to drive any SCSI bus signals. | |
1324 | * | |
c28bda25 RZ |
1325 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1326 | * instance->connected will be set to cmd. | |
1327 | * SELECT interrupt will be disabled. | |
1da177e4 | 1328 | * |
c28bda25 | 1329 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1330 | * cmd->result host byte set to DID_BAD_TARGET. |
1331 | */ | |
1332 | ||
710ddd0d | 1333 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1334 | { |
c28bda25 RZ |
1335 | SETUP_HOSTDATA(instance); |
1336 | unsigned char tmp[3], phase; | |
1337 | unsigned char *data; | |
1338 | int len; | |
1339 | unsigned long timeout; | |
1340 | unsigned long flags; | |
1341 | ||
1342 | hostdata->restart_select = 0; | |
8ad3a593 | 1343 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1344 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1345 | instance->this_id); |
1346 | ||
1347 | /* | |
1348 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1349 | * data bus during SELECTION. | |
1350 | */ | |
1351 | ||
1352 | local_irq_save(flags); | |
1353 | if (hostdata->connected) { | |
1354 | local_irq_restore(flags); | |
1355 | return -1; | |
1356 | } | |
1357 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1358 | |
c28bda25 RZ |
1359 | /* |
1360 | * Start arbitration. | |
1361 | */ | |
1da177e4 | 1362 | |
c28bda25 RZ |
1363 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1364 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1365 | |
c28bda25 | 1366 | local_irq_restore(flags); |
1da177e4 | 1367 | |
c28bda25 | 1368 | /* Wait for arbitration logic to complete */ |
fb810d12 | 1369 | #if defined(NCR_TIMEOUT) |
c28bda25 RZ |
1370 | { |
1371 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; | |
1372 | ||
1373 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && | |
1374 | time_before(jiffies, timeout) && !hostdata->connected) | |
1375 | ; | |
1376 | if (time_after_eq(jiffies, timeout)) { | |
1377 | printk("scsi : arbitration timeout at %d\n", __LINE__); | |
1378 | NCR5380_write(MODE_REG, MR_BASE); | |
1379 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1380 | return -1; | |
1381 | } | |
1382 | } | |
1da177e4 | 1383 | #else /* NCR_TIMEOUT */ |
c28bda25 RZ |
1384 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && |
1385 | !hostdata->connected) | |
1386 | ; | |
1da177e4 LT |
1387 | #endif |
1388 | ||
d65e634a | 1389 | dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO); |
c28bda25 RZ |
1390 | |
1391 | if (hostdata->connected) { | |
1392 | NCR5380_write(MODE_REG, MR_BASE); | |
1393 | return -1; | |
1394 | } | |
1395 | /* | |
1396 | * The arbitration delay is 2.2us, but this is a minimum and there is | |
1397 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | |
1398 | * the integral nature of udelay(). | |
1399 | * | |
1400 | */ | |
1401 | ||
1402 | udelay(3); | |
1403 | ||
1404 | /* Check for lost arbitration */ | |
1405 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1406 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1407 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1408 | hostdata->connected) { | |
1409 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1410 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 RZ |
1411 | HOSTNO); |
1412 | return -1; | |
1413 | } | |
1da177e4 | 1414 | |
c28bda25 RZ |
1415 | /* after/during arbitration, BSY should be asserted. |
1416 | IBM DPES-31080 Version S31Q works now */ | |
1417 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ | |
1418 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1419 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1420 | ||
1421 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1422 | hostdata->connected) { | |
1423 | NCR5380_write(MODE_REG, MR_BASE); | |
1424 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
d65e634a | 1425 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
c28bda25 RZ |
1426 | HOSTNO); |
1427 | return -1; | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1432 | * a minimum so we'll udelay ceil(1.2) | |
1433 | */ | |
1da177e4 LT |
1434 | |
1435 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY | |
c28bda25 RZ |
1436 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ |
1437 | udelay(15); | |
1da177e4 | 1438 | #else |
c28bda25 | 1439 | udelay(2); |
1da177e4 | 1440 | #endif |
c28bda25 RZ |
1441 | |
1442 | if (hostdata->connected) { | |
1443 | NCR5380_write(MODE_REG, MR_BASE); | |
1444 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1445 | return -1; | |
1446 | } | |
1447 | ||
d65e634a | 1448 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1449 | |
1450 | /* | |
1451 | * Now that we have won arbitration, start Selection process, asserting | |
1452 | * the host and target ID's on the SCSI bus. | |
1453 | */ | |
1454 | ||
1455 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1456 | ||
1457 | /* | |
1458 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1459 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1460 | * phase immediately after selection. | |
1461 | */ | |
1462 | ||
1463 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1464 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1465 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1466 | |
c28bda25 RZ |
1467 | /* |
1468 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1469 | * otherwise we will trigger an interrupt. | |
1470 | */ | |
1471 | ||
1472 | if (hostdata->connected) { | |
1473 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1474 | return -1; | |
1475 | } | |
1476 | ||
1477 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 1478 | |
c28bda25 RZ |
1479 | /* |
1480 | * The initiator shall then wait at least two deskew delays and release | |
1481 | * the BSY signal. | |
1482 | */ | |
1483 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1484 | ||
1485 | /* Reset BSY */ | |
1486 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1487 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1488 | ||
1489 | /* | |
1490 | * Something weird happens when we cease to drive BSY - looks | |
1491 | * like the board/chip is letting us do another read before the | |
1492 | * appropriate propagation delay has expired, and we're confusing | |
1493 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1494 | * | |
1495 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1496 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1497 | * tighter 'C' code breaks and requires this) solves the problem - | |
1498 | * the 1 us delay is arbitrary, and only used because this delay will | |
1499 | * be the same on other platforms and since it works here, it should | |
1500 | * work there. | |
1501 | * | |
1502 | * wingel suggests that this could be due to failing to wait | |
1503 | * one deskew delay. | |
1504 | */ | |
1da177e4 | 1505 | |
c28bda25 | 1506 | udelay(1); |
1da177e4 | 1507 | |
d65e634a | 1508 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1509 | |
c28bda25 RZ |
1510 | /* |
1511 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1512 | * selection. | |
1513 | */ | |
1da177e4 | 1514 | |
ff50f9ed | 1515 | timeout = jiffies + (250 * HZ / 1000); |
1da177e4 | 1516 | |
c28bda25 RZ |
1517 | /* |
1518 | * XXX very interesting - we're seeing a bounce where the BSY we | |
1519 | * asserted is being reflected / still asserted (propagation delay?) | |
1520 | * and it's detecting as true. Sigh. | |
1521 | */ | |
1da177e4 LT |
1522 | |
1523 | #if 0 | |
c28bda25 RZ |
1524 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert |
1525 | * IO while SEL is true. But again, there are some disks out the in the | |
1526 | * world that do that nevertheless. (Somebody claimed that this announces | |
1527 | * reselection capability of the target.) So we better skip that test and | |
1528 | * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) | |
1529 | */ | |
1530 | ||
1531 | while (time_before(jiffies, timeout) && | |
1532 | !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO))) | |
1533 | ; | |
1534 | ||
1535 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1536 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1537 | NCR5380_reselect(instance); | |
1538 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", | |
1539 | HOSTNO); | |
1540 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1541 | return -1; | |
1542 | } | |
1da177e4 | 1543 | #else |
c28bda25 RZ |
1544 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)) |
1545 | ; | |
1da177e4 LT |
1546 | #endif |
1547 | ||
c28bda25 RZ |
1548 | /* |
1549 | * No less than two deskew delays after the initiator detects the | |
1550 | * BSY signal is true, it shall release the SEL signal and may | |
1551 | * change the DATA BUS. -wingel | |
1552 | */ | |
1da177e4 | 1553 | |
c28bda25 | 1554 | udelay(1); |
1da177e4 | 1555 | |
c28bda25 | 1556 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1da177e4 | 1557 | |
c28bda25 RZ |
1558 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
1559 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1560 | if (hostdata->targets_present & (1 << cmd->device->id)) { | |
1561 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); | |
1562 | if (hostdata->restart_select) | |
1563 | printk(KERN_NOTICE "\trestart select\n"); | |
8ad3a593 | 1564 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
1565 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1566 | return -1; | |
1567 | } | |
1568 | cmd->result = DID_BAD_TARGET << 16; | |
1da177e4 | 1569 | #ifdef SUPPORT_TAGS |
c28bda25 | 1570 | cmd_free_tag(cmd); |
1da177e4 | 1571 | #endif |
c28bda25 RZ |
1572 | cmd->scsi_done(cmd); |
1573 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1574 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1575 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1576 | return 0; | |
1577 | } | |
1578 | ||
1579 | hostdata->targets_present |= (1 << cmd->device->id); | |
1580 | ||
1581 | /* | |
1582 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1583 | * was true but before BSY was false during selection, the information | |
1584 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1585 | * IDENTIFY message. | |
1586 | * | |
1587 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1588 | * message (2 bytes) with a tag ID that we increment with every command | |
1589 | * until it wraps back to 0. | |
1590 | * | |
1591 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1592 | * which claim to support tagged queuing but fail when more than | |
1593 | * some number of commands are issued at once. | |
1594 | */ | |
1595 | ||
1596 | /* Wait for start of REQ/ACK handshake */ | |
1597 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
1598 | ; | |
1599 | ||
d65e634a | 1600 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1601 | HOSTNO, cmd->device->id); |
1602 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1603 | |
1604 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1605 | if (cmd->tag != TAG_NONE) { |
1606 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1607 | tmp[2] = cmd->tag; | |
1608 | len = 3; | |
1609 | } else | |
1610 | len = 1; | |
1da177e4 | 1611 | #else |
c28bda25 RZ |
1612 | len = 1; |
1613 | cmd->tag = 0; | |
1da177e4 LT |
1614 | #endif /* SUPPORT_TAGS */ |
1615 | ||
c28bda25 RZ |
1616 | /* Send message(s) */ |
1617 | data = tmp; | |
1618 | phase = PHASE_MSGOUT; | |
1619 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1620 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 RZ |
1621 | /* XXX need to handle errors here */ |
1622 | hostdata->connected = cmd; | |
1da177e4 | 1623 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1624 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1625 | #endif | |
e3f463b0 FT |
1626 | #ifdef SUN3_SCSI_VME |
1627 | dregs->csr |= CSR_INTR; | |
1628 | #endif | |
1da177e4 | 1629 | |
c28bda25 | 1630 | initialize_SCp(cmd); |
1da177e4 | 1631 | |
c28bda25 | 1632 | return 0; |
1da177e4 LT |
1633 | } |
1634 | ||
c28bda25 RZ |
1635 | /* |
1636 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1637 | * unsigned char *phase, int *count, unsigned char **data) |
1638 | * | |
1639 | * Purpose : transfers data in given phase using polled I/O | |
1640 | * | |
c28bda25 RZ |
1641 | * Inputs : instance - instance of driver, *phase - pointer to |
1642 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1643 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1644 | * |
1da177e4 | 1645 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1646 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1647 | * is in same phase. |
1648 | * | |
c28bda25 | 1649 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1650 | * |
1651 | * XXX Note : handling for bus free may be useful. | |
1652 | */ | |
1653 | ||
1654 | /* | |
c28bda25 | 1655 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1656 | * IS 100% reliable, and for the actual data transfer where speed |
1657 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1658 | */ | |
1659 | ||
c28bda25 RZ |
1660 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1661 | unsigned char *phase, int *count, | |
1662 | unsigned char **data) | |
1da177e4 | 1663 | { |
c28bda25 RZ |
1664 | register unsigned char p = *phase, tmp; |
1665 | register int c = *count; | |
1666 | register unsigned char *d = *data; | |
1667 | ||
1668 | /* | |
1669 | * The NCR5380 chip will only drive the SCSI bus when the | |
1670 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1671 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1672 | */ |
1da177e4 | 1673 | |
c28bda25 | 1674 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1675 | |
c28bda25 RZ |
1676 | do { |
1677 | /* | |
1678 | * Wait for assertion of REQ, after which the phase bits will be | |
1679 | * valid | |
1680 | */ | |
1681 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) | |
1682 | ; | |
1da177e4 | 1683 | |
d65e634a | 1684 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1685 | |
c28bda25 RZ |
1686 | /* Check for phase mismatch */ |
1687 | if ((tmp & PHASE_MASK) != p) { | |
d65e634a | 1688 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1689 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1690 | break; |
1691 | } | |
1da177e4 | 1692 | |
c28bda25 RZ |
1693 | /* Do actual transfer from SCSI bus to / from memory */ |
1694 | if (!(p & SR_IO)) | |
1695 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1696 | else | |
1697 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1698 | |
c28bda25 | 1699 | ++d; |
1da177e4 | 1700 | |
c28bda25 RZ |
1701 | /* |
1702 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1703 | * should drop ATN on the last byte of the message phase | |
1704 | * after REQ has been asserted for the handshake but before | |
1705 | * the initiator raises ACK. | |
1706 | */ | |
1da177e4 | 1707 | |
c28bda25 RZ |
1708 | if (!(p & SR_IO)) { |
1709 | if (!((p & SR_MSG) && c > 1)) { | |
1710 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1711 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1712 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1713 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1714 | } else { | |
1715 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1716 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1717 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1718 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1719 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1720 | } | |
1721 | } else { | |
8ad3a593 | 1722 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1723 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1724 | } | |
1da177e4 | 1725 | |
c28bda25 RZ |
1726 | while (NCR5380_read(STATUS_REG) & SR_REQ) |
1727 | ; | |
1728 | ||
d65e634a | 1729 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1730 | |
1731 | /* | |
1732 | * We have several special cases to consider during REQ/ACK handshaking : | |
1733 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1734 | * message. ATN must be dropped as ACK is dropped. | |
1735 | * | |
1736 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1737 | * message. We must exit with ACK asserted, so that the calling | |
1738 | * code may raise ATN before dropping ACK to reject the message. | |
1739 | * | |
1740 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1741 | */ | |
1742 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1743 | if (p == PHASE_MSGOUT && c > 1) | |
1744 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1745 | else | |
1746 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1747 | } | |
1748 | } while (--c); | |
1749 | ||
d65e634a | 1750 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1751 | |
1752 | *count = c; | |
1753 | *data = d; | |
1754 | tmp = NCR5380_read(STATUS_REG); | |
1755 | /* The phase read from the bus is valid if either REQ is (already) | |
1756 | * asserted or if ACK hasn't been released yet. The latter is the case if | |
1757 | * we're in MSGIN and all wanted bytes have been received. | |
1758 | */ | |
1759 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) | |
1760 | *phase = tmp & PHASE_MASK; | |
1761 | else | |
1762 | *phase = PHASE_UNKNOWN; | |
1763 | ||
1764 | if (!c || (*phase == p)) | |
1765 | return 0; | |
1766 | else | |
1767 | return -1; | |
1da177e4 LT |
1768 | } |
1769 | ||
1770 | /* | |
1771 | * Function : do_abort (Scsi_Host *host) | |
c28bda25 RZ |
1772 | * |
1773 | * Purpose : abort the currently established nexus. Should only be | |
1774 | * called from a routine which can drop into a | |
1775 | * | |
1da177e4 LT |
1776 | * Returns : 0 on success, -1 on failure. |
1777 | */ | |
1778 | ||
c28bda25 | 1779 | static int do_abort(struct Scsi_Host *host) |
1da177e4 | 1780 | { |
c28bda25 RZ |
1781 | unsigned char tmp, *msgptr, phase; |
1782 | int len; | |
1783 | ||
1784 | /* Request message out phase */ | |
1da177e4 | 1785 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1786 | |
1787 | /* | |
1788 | * Wait for the target to indicate a valid phase by asserting | |
1789 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1790 | * and can immediately send the ABORT message, or we'll have some | |
1791 | * other phase and will have to source/sink data. | |
1792 | * | |
1793 | * We really don't care what value was on the bus or what value | |
1794 | * the target sees, so we just handshake. | |
1795 | */ | |
1796 | ||
3be38e7a | 1797 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) |
c28bda25 RZ |
1798 | ; |
1799 | ||
1800 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1801 | ||
1802 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1803 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1804 | ICR_ASSERT_ACK); | |
1805 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1806 | ; | |
1807 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1808 | } | |
1809 | ||
1810 | tmp = ABORT; | |
1811 | msgptr = &tmp; | |
1812 | len = 1; | |
1813 | phase = PHASE_MSGOUT; | |
1814 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); | |
1815 | ||
1816 | /* | |
1817 | * If we got here, and the command completed successfully, | |
1818 | * we're about to go into bus free state. | |
1819 | */ | |
1820 | ||
1821 | return len ? -1 : 0; | |
1da177e4 LT |
1822 | } |
1823 | ||
1824 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1825 | /* |
1826 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1827 | * unsigned char *phase, int *count, unsigned char **data) |
1828 | * | |
1829 | * Purpose : transfers data in given phase using either real | |
1830 | * or pseudo DMA. | |
1831 | * | |
c28bda25 RZ |
1832 | * Inputs : instance - instance of driver, *phase - pointer to |
1833 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1834 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1835 | * |
1da177e4 | 1836 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1837 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1838 | * is in same phase. |
1839 | * | |
c28bda25 | 1840 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1841 | * |
1842 | */ | |
1843 | ||
1844 | ||
c28bda25 RZ |
1845 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1846 | unsigned char *phase, int *count, | |
1847 | unsigned char **data) | |
1da177e4 | 1848 | { |
c28bda25 RZ |
1849 | SETUP_HOSTDATA(instance); |
1850 | register int c = *count; | |
1851 | register unsigned char p = *phase; | |
e3f463b0 FT |
1852 | unsigned long flags; |
1853 | ||
1854 | #if defined(CONFIG_SUN3) | |
1855 | /* sanity check */ | |
1856 | if (!sun3_dma_setup_done) { | |
1857 | pr_err("scsi%d: transfer_dma without setup!\n", | |
1858 | instance->host_no); | |
1859 | BUG(); | |
1860 | } | |
1861 | hostdata->dma_len = c; | |
1862 | ||
1863 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", | |
1864 | instance->host_no, (p & SR_IO) ? "reading" : "writing", | |
1865 | c, (p & SR_IO) ? "to" : "from", *data); | |
1866 | ||
1867 | /* netbsd turns off ints here, why not be safe and do it too */ | |
1868 | local_irq_save(flags); | |
1869 | ||
1870 | /* send start chain */ | |
1871 | sun3scsi_dma_start(c, *data); | |
1872 | ||
1873 | if (p & SR_IO) { | |
1874 | NCR5380_write(TARGET_COMMAND_REG, 1); | |
1875 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1876 | NCR5380_write(INITIATOR_COMMAND_REG, 0); | |
1877 | NCR5380_write(MODE_REG, | |
1878 | (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1879 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1880 | } else { | |
1881 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1882 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1883 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); | |
1884 | NCR5380_write(MODE_REG, | |
1885 | (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); | |
1886 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1887 | } | |
1888 | ||
1889 | #ifdef SUN3_SCSI_VME | |
1890 | dregs->csr |= CSR_DMA_ENABLE; | |
1891 | #endif | |
1892 | ||
1893 | local_irq_restore(flags); | |
1894 | ||
1895 | sun3_dma_active = 1; | |
1896 | ||
1897 | #else /* !defined(CONFIG_SUN3) */ | |
c28bda25 RZ |
1898 | register unsigned char *d = *data; |
1899 | unsigned char tmp; | |
c28bda25 RZ |
1900 | |
1901 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1902 | *phase = tmp; | |
1903 | return -1; | |
1904 | } | |
1da177e4 | 1905 | |
ef1081cb FT |
1906 | if (hostdata->read_overruns && (p & SR_IO)) |
1907 | c -= hostdata->read_overruns; | |
1da177e4 | 1908 | |
d65e634a | 1909 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1910 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1911 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1912 | |
c28bda25 | 1913 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 LT |
1914 | |
1915 | #ifdef REAL_DMA | |
c28bda25 | 1916 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1da177e4 LT |
1917 | #endif /* def REAL_DMA */ |
1918 | ||
ef1081cb | 1919 | if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
c28bda25 RZ |
1920 | /* On the Medusa, it is a must to initialize the DMA before |
1921 | * starting the NCR. This is also the cleaner way for the TT. | |
1922 | */ | |
1923 | local_irq_save(flags); | |
1924 | hostdata->dma_len = (p & SR_IO) ? | |
1925 | NCR5380_dma_read_setup(instance, d, c) : | |
1926 | NCR5380_dma_write_setup(instance, d, c); | |
1927 | local_irq_restore(flags); | |
1928 | } | |
1929 | ||
1930 | if (p & SR_IO) | |
1931 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1932 | else { | |
1933 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1934 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1935 | } | |
1936 | ||
ef1081cb | 1937 | if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
c28bda25 RZ |
1938 | /* On the Falcon, the DMA setup must be done after the last */ |
1939 | /* NCR access, else the DMA setup gets trashed! | |
1940 | */ | |
1941 | local_irq_save(flags); | |
1942 | hostdata->dma_len = (p & SR_IO) ? | |
1943 | NCR5380_dma_read_setup(instance, d, c) : | |
1944 | NCR5380_dma_write_setup(instance, d, c); | |
1945 | local_irq_restore(flags); | |
1946 | } | |
e3f463b0 FT |
1947 | #endif /* !defined(CONFIG_SUN3) */ |
1948 | ||
c28bda25 | 1949 | return 0; |
1da177e4 LT |
1950 | } |
1951 | #endif /* defined(REAL_DMA) */ | |
1952 | ||
1953 | /* | |
1954 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1955 | * | |
c28bda25 RZ |
1956 | * Purpose : run through the various SCSI phases and do as the target |
1957 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1958 | * instance->connected. |
1959 | * | |
1960 | * Inputs : instance, instance for which we are doing commands | |
1961 | * | |
c28bda25 | 1962 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1963 | * modified if a command disconnects, *instance->connected will |
1964 | * change. | |
1965 | * | |
c28bda25 RZ |
1966 | * XXX Note : we need to watch for bus free or a reset condition here |
1967 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1968 | */ |
c28bda25 RZ |
1969 | |
1970 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1971 | { |
c28bda25 RZ |
1972 | SETUP_HOSTDATA(instance); |
1973 | unsigned long flags; | |
1974 | unsigned char msgout = NOP; | |
1975 | int sink = 0; | |
1976 | int len; | |
1da177e4 | 1977 | #if defined(REAL_DMA) |
c28bda25 | 1978 | int transfersize; |
1da177e4 | 1979 | #endif |
c28bda25 RZ |
1980 | unsigned char *data; |
1981 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1982 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
c28bda25 | 1983 | |
e3f463b0 FT |
1984 | #ifdef SUN3_SCSI_VME |
1985 | dregs->csr |= CSR_INTR; | |
1986 | #endif | |
1987 | ||
c28bda25 RZ |
1988 | while (1) { |
1989 | tmp = NCR5380_read(STATUS_REG); | |
1990 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1991 | if (tmp & SR_REQ) { | |
1992 | phase = (tmp & PHASE_MASK); | |
1993 | if (phase != old_phase) { | |
1994 | old_phase = phase; | |
8ad3a593 | 1995 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1996 | } |
e3f463b0 FT |
1997 | #if defined(CONFIG_SUN3) |
1998 | if (phase == PHASE_CMDOUT) { | |
1999 | #if defined(REAL_DMA) | |
2000 | void *d; | |
2001 | unsigned long count; | |
2002 | ||
2003 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2004 | count = cmd->SCp.buffer->length; | |
2005 | d = sg_virt(cmd->SCp.buffer); | |
2006 | } else { | |
2007 | count = cmd->SCp.this_residual; | |
2008 | d = cmd->SCp.ptr; | |
2009 | } | |
2010 | /* this command setup for dma yet? */ | |
2011 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != cmd)) { | |
2012 | if (cmd->request->cmd_type == REQ_TYPE_FS) { | |
2013 | sun3scsi_dma_setup(d, count, | |
2014 | rq_data_dir(cmd->request)); | |
2015 | sun3_dma_setup_done = cmd; | |
2016 | } | |
2017 | } | |
2018 | #endif | |
2019 | #ifdef SUN3_SCSI_VME | |
2020 | dregs->csr |= CSR_INTR; | |
2021 | #endif | |
2022 | } | |
2023 | #endif /* CONFIG_SUN3 */ | |
1da177e4 | 2024 | |
c28bda25 RZ |
2025 | if (sink && (phase != PHASE_MSGOUT)) { |
2026 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
2027 | ||
2028 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
2029 | ICR_ASSERT_ACK); | |
2030 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
2031 | ; | |
2032 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2033 | ICR_ASSERT_ATN); | |
2034 | sink = 0; | |
2035 | continue; | |
2036 | } | |
2037 | ||
2038 | switch (phase) { | |
2039 | case PHASE_DATAOUT: | |
1da177e4 | 2040 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
2041 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
2042 | "aborted\n", HOSTNO); | |
2043 | sink = 1; | |
2044 | do_abort(instance); | |
2045 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2046 | cmd->scsi_done(cmd); |
c28bda25 | 2047 | return; |
1da177e4 | 2048 | #endif |
c28bda25 RZ |
2049 | case PHASE_DATAIN: |
2050 | /* | |
2051 | * If there is no room left in the current buffer in the | |
2052 | * scatter-gather list, move onto the next one. | |
2053 | */ | |
2054 | ||
2055 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2056 | ++cmd->SCp.buffer; | |
2057 | --cmd->SCp.buffers_residual; | |
2058 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 2059 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
2060 | /* ++roman: Try to merge some scatter-buffers if |
2061 | * they are at contiguous physical addresses. | |
2062 | */ | |
2063 | merge_contiguous_buffers(cmd); | |
d65e634a | 2064 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
2065 | HOSTNO, cmd->SCp.this_residual, |
2066 | cmd->SCp.buffers_residual); | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * The preferred transfer method is going to be | |
2071 | * PSEUDO-DMA for systems that are strictly PIO, | |
2072 | * since we can let the hardware do the handshaking. | |
2073 | * | |
2074 | * For this to work, we need to know the transfersize | |
2075 | * ahead of time, since the pseudo-DMA code will sit | |
2076 | * in an unconditional loop. | |
2077 | */ | |
2078 | ||
2079 | /* ++roman: I suggest, this should be | |
2080 | * #if def(REAL_DMA) | |
2081 | * instead of leaving REAL_DMA out. | |
2082 | */ | |
1da177e4 LT |
2083 | |
2084 | #if defined(REAL_DMA) | |
e3f463b0 FT |
2085 | if ( |
2086 | #if !defined(CONFIG_SUN3) | |
2087 | !cmd->device->borken && | |
2088 | #endif | |
2089 | (transfersize = NCR5380_dma_xfer_len(instance, cmd, phase)) >= DMA_MIN_SIZE) { | |
c28bda25 RZ |
2090 | len = transfersize; |
2091 | cmd->SCp.phase = phase; | |
2092 | if (NCR5380_transfer_dma(instance, &phase, | |
2093 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2094 | /* | |
2095 | * If the watchdog timer fires, all future | |
2096 | * accesses to this device will use the | |
2097 | * polled-IO. */ | |
ff50f9ed FT |
2098 | scmd_printk(KERN_INFO, cmd, |
2099 | "switching to slow handshake\n"); | |
c28bda25 RZ |
2100 | cmd->device->borken = 1; |
2101 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2102 | ICR_ASSERT_ATN); | |
2103 | sink = 1; | |
2104 | do_abort(instance); | |
2105 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2106 | cmd->scsi_done(cmd); |
c28bda25 RZ |
2107 | /* XXX - need to source or sink data here, as appropriate */ |
2108 | } else { | |
1da177e4 | 2109 | #ifdef REAL_DMA |
c28bda25 RZ |
2110 | /* ++roman: When using real DMA, |
2111 | * information_transfer() should return after | |
2112 | * starting DMA since it has nothing more to | |
2113 | * do. | |
2114 | */ | |
2115 | return; | |
2116 | #else | |
2117 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2118 | #endif |
c28bda25 RZ |
2119 | } |
2120 | } else | |
1da177e4 | 2121 | #endif /* defined(REAL_DMA) */ |
c28bda25 RZ |
2122 | NCR5380_transfer_pio(instance, &phase, |
2123 | (int *)&cmd->SCp.this_residual, | |
2124 | (unsigned char **)&cmd->SCp.ptr); | |
e3f463b0 FT |
2125 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2126 | /* if we had intended to dma that command clear it */ | |
2127 | if (sun3_dma_setup_done == cmd) | |
2128 | sun3_dma_setup_done = NULL; | |
2129 | #endif | |
c28bda25 RZ |
2130 | break; |
2131 | case PHASE_MSGIN: | |
2132 | len = 1; | |
2133 | data = &tmp; | |
2134 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2135 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2136 | cmd->SCp.Message = tmp; | |
2137 | ||
2138 | switch (tmp) { | |
2139 | /* | |
2140 | * Linking lets us reduce the time required to get the | |
2141 | * next command out to the device, hopefully this will | |
2142 | * mean we don't waste another revolution due to the delays | |
2143 | * required by ARBITRATION and another SELECTION. | |
2144 | * | |
2145 | * In the current implementation proposal, low level drivers | |
2146 | * merely have to start the next command, pointed to by | |
2147 | * next_link, done() is called as with unlinked commands. | |
2148 | */ | |
1da177e4 | 2149 | #ifdef LINKED |
c28bda25 RZ |
2150 | case LINKED_CMD_COMPLETE: |
2151 | case LINKED_FLG_CMD_COMPLETE: | |
2152 | /* Accept message by clearing ACK */ | |
2153 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2154 | ||
9cb78c16 | 2155 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked command " |
c28bda25 RZ |
2156 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
2157 | ||
2158 | /* Enable reselect interrupts */ | |
2159 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2160 | /* | |
2161 | * Sanity check : A linked command should only terminate | |
2162 | * with one of these messages if there are more linked | |
2163 | * commands available. | |
2164 | */ | |
2165 | ||
2166 | if (!cmd->next_link) { | |
9cb78c16 | 2167 | printk(KERN_NOTICE "scsi%d: target %d lun %llu " |
c28bda25 RZ |
2168 | "linked command complete, no next_link\n", |
2169 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2170 | sink = 1; | |
2171 | do_abort(instance); | |
2172 | return; | |
2173 | } | |
2174 | ||
2175 | initialize_SCp(cmd->next_link); | |
2176 | /* The next command is still part of this process; copy it | |
2177 | * and don't free it! */ | |
2178 | cmd->next_link->tag = cmd->tag; | |
2179 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
9cb78c16 | 2180 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked request " |
c28bda25 RZ |
2181 | "done, calling scsi_done().\n", |
2182 | HOSTNO, cmd->device->id, cmd->device->lun); | |
c28bda25 RZ |
2183 | cmd->scsi_done(cmd); |
2184 | cmd = hostdata->connected; | |
2185 | break; | |
1da177e4 | 2186 | #endif /* def LINKED */ |
c28bda25 RZ |
2187 | case ABORT: |
2188 | case COMMAND_COMPLETE: | |
2189 | /* Accept message by clearing ACK */ | |
2190 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
9cb78c16 | 2191 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2192 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
e3c3da67 FT |
2193 | |
2194 | local_irq_save(flags); | |
2195 | hostdata->retain_dma_intr++; | |
2196 | hostdata->connected = NULL; | |
1da177e4 | 2197 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2198 | cmd_free_tag(cmd); |
2199 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
2200 | /* Turn a QUEUE FULL status into BUSY, I think the | |
2201 | * mid level cannot handle QUEUE FULL :-( (The | |
2202 | * command is retried after BUSY). Also update our | |
2203 | * queue size to the number of currently issued | |
2204 | * commands now. | |
2205 | */ | |
2206 | /* ++Andreas: the mid level code knows about | |
2207 | QUEUE_FULL now. */ | |
2208 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
9cb78c16 | 2209 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2210 | "QUEUE_FULL after %d commands\n", |
2211 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2212 | ta->nr_allocated); | |
2213 | if (ta->queue_size > ta->nr_allocated) | |
2214 | ta->nr_allocated = ta->queue_size; | |
2215 | } | |
1da177e4 | 2216 | #else |
c28bda25 | 2217 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2218 | #endif |
c28bda25 RZ |
2219 | /* Enable reselect interrupts */ |
2220 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2221 | ||
2222 | /* | |
2223 | * I'm not sure what the correct thing to do here is : | |
2224 | * | |
2225 | * If the command that just executed is NOT a request | |
2226 | * sense, the obvious thing to do is to set the result | |
2227 | * code to the values of the stored parameters. | |
2228 | * | |
2229 | * If it was a REQUEST SENSE command, we need some way to | |
2230 | * differentiate between the failure code of the original | |
2231 | * and the failure code of the REQUEST sense - the obvious | |
2232 | * case is success, where we fall through and leave the | |
2233 | * result code unchanged. | |
2234 | * | |
2235 | * The non-obvious place is where the REQUEST SENSE failed | |
2236 | */ | |
2237 | ||
2238 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2239 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2240 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2241 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2242 | |
28424d3a BH |
2243 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2244 | hostdata->ses.cmd_len) { | |
2245 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2246 | hostdata->ses.cmd_len = 0 ; | |
2247 | } | |
2248 | ||
c28bda25 RZ |
2249 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2250 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2251 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2252 | ||
d65e634a | 2253 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 | 2254 | |
c28bda25 | 2255 | LIST(cmd,hostdata->issue_queue); |
3130d905 | 2256 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2257 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
d65e634a | 2258 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
c28bda25 | 2259 | "issue queue\n", H_NO(cmd)); |
997acab7 | 2260 | } else { |
c28bda25 RZ |
2261 | cmd->scsi_done(cmd); |
2262 | } | |
2263 | ||
e3c3da67 FT |
2264 | local_irq_restore(flags); |
2265 | ||
c28bda25 RZ |
2266 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
2267 | /* | |
2268 | * Restore phase bits to 0 so an interrupted selection, | |
2269 | * arbitration can resume. | |
2270 | */ | |
2271 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2272 | ||
2273 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2274 | barrier(); | |
2275 | ||
e3c3da67 | 2276 | local_irq_save(flags); |
ef1081cb | 2277 | hostdata->retain_dma_intr--; |
c28bda25 RZ |
2278 | /* ++roman: For Falcon SCSI, release the lock on the |
2279 | * ST-DMA here if no other commands are waiting on the | |
2280 | * disconnected queue. | |
2281 | */ | |
e3c3da67 FT |
2282 | maybe_release_dma_irq(instance); |
2283 | local_irq_restore(flags); | |
c28bda25 RZ |
2284 | return; |
2285 | case MESSAGE_REJECT: | |
2286 | /* Accept message by clearing ACK */ | |
2287 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2288 | /* Enable reselect interrupts */ | |
2289 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2290 | switch (hostdata->last_message) { | |
2291 | case HEAD_OF_QUEUE_TAG: | |
2292 | case ORDERED_QUEUE_TAG: | |
2293 | case SIMPLE_QUEUE_TAG: | |
2294 | /* The target obviously doesn't support tagged | |
2295 | * queuing, even though it announced this ability in | |
2296 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2297 | * clear 'tagged_supported' and lock the LUN, since | |
2298 | * the command is treated as untagged further on. | |
2299 | */ | |
2300 | cmd->device->tagged_supported = 0; | |
2301 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2302 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2303 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2304 | "QUEUE_TAG message; tagged queuing " |
2305 | "disabled\n", | |
2306 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2307 | break; | |
2308 | } | |
2309 | break; | |
2310 | case DISCONNECT: | |
2311 | /* Accept message by clearing ACK */ | |
2312 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2313 | local_irq_save(flags); | |
2314 | cmd->device->disconnect = 1; | |
2315 | LIST(cmd,hostdata->disconnected_queue); | |
3130d905 | 2316 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2317 | hostdata->connected = NULL; |
2318 | hostdata->disconnected_queue = cmd; | |
2319 | local_irq_restore(flags); | |
9cb78c16 | 2320 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2321 | "moved from connected to the " |
2322 | "disconnected_queue\n", HOSTNO, | |
2323 | cmd->device->id, cmd->device->lun); | |
2324 | /* | |
2325 | * Restore phase bits to 0 so an interrupted selection, | |
2326 | * arbitration can resume. | |
2327 | */ | |
2328 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2329 | ||
2330 | /* Enable reselect interrupts */ | |
2331 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2332 | /* Wait for bus free to avoid nasty timeouts */ | |
2333 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2334 | barrier(); | |
e3f463b0 FT |
2335 | #ifdef SUN3_SCSI_VME |
2336 | dregs->csr |= CSR_DMA_ENABLE; | |
2337 | #endif | |
c28bda25 RZ |
2338 | return; |
2339 | /* | |
2340 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2341 | * operation, in violation of the SCSI spec so we can safely | |
2342 | * ignore SAVE/RESTORE pointers calls. | |
2343 | * | |
2344 | * Unfortunately, some disks violate the SCSI spec and | |
2345 | * don't issue the required SAVE_POINTERS message before | |
2346 | * disconnecting, and we have to break spec to remain | |
2347 | * compatible. | |
2348 | */ | |
2349 | case SAVE_POINTERS: | |
2350 | case RESTORE_POINTERS: | |
2351 | /* Accept message by clearing ACK */ | |
2352 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2353 | /* Enable reselect interrupts */ | |
2354 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2355 | break; | |
2356 | case EXTENDED_MESSAGE: | |
2357 | /* | |
2358 | * Extended messages are sent in the following format : | |
2359 | * Byte | |
2360 | * 0 EXTENDED_MESSAGE == 1 | |
2361 | * 1 length (includes one byte for code, doesn't | |
2362 | * include first two bytes) | |
2363 | * 2 code | |
2364 | * 3..length+1 arguments | |
2365 | * | |
2366 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2367 | * byte, since spi_print_msg() wants the whole thing. | |
2368 | */ | |
2369 | extended_msg[0] = EXTENDED_MESSAGE; | |
2370 | /* Accept first byte by clearing ACK */ | |
2371 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2372 | ||
d65e634a | 2373 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2374 | |
2375 | len = 2; | |
2376 | data = extended_msg + 1; | |
2377 | phase = PHASE_MSGIN; | |
2378 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2379 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2380 | (int)extended_msg[1], (int)extended_msg[2]); |
2381 | ||
2382 | if (!len && extended_msg[1] <= | |
2383 | (sizeof(extended_msg) - 1)) { | |
2384 | /* Accept third byte by clearing ACK */ | |
2385 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2386 | len = extended_msg[1] - 1; | |
2387 | data = extended_msg + 3; | |
2388 | phase = PHASE_MSGIN; | |
2389 | ||
2390 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2391 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2392 | HOSTNO, len); |
2393 | ||
2394 | switch (extended_msg[2]) { | |
2395 | case EXTENDED_SDTR: | |
2396 | case EXTENDED_WDTR: | |
2397 | case EXTENDED_MODIFY_DATA_POINTER: | |
2398 | case EXTENDED_EXTENDED_IDENTIFY: | |
2399 | tmp = 0; | |
2400 | } | |
2401 | } else if (len) { | |
2402 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2403 | "extended message\n", HOSTNO); | |
2404 | tmp = 0; | |
2405 | } else { | |
2406 | printk(KERN_NOTICE "scsi%d: extended message " | |
2407 | "code %02x length %d is too long\n", | |
2408 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2409 | tmp = 0; | |
2410 | } | |
2411 | /* Fall through to reject message */ | |
2412 | ||
2413 | /* | |
2414 | * If we get something weird that we aren't expecting, | |
2415 | * reject it. | |
2416 | */ | |
2417 | default: | |
2418 | if (!tmp) { | |
ff50f9ed FT |
2419 | printk(KERN_INFO "scsi%d: rejecting message ", |
2420 | instance->host_no); | |
c28bda25 RZ |
2421 | spi_print_msg(extended_msg); |
2422 | printk("\n"); | |
2423 | } else if (tmp != EXTENDED_MESSAGE) | |
ff50f9ed FT |
2424 | scmd_printk(KERN_INFO, cmd, |
2425 | "rejecting unknown message %02x\n", | |
2426 | tmp); | |
c28bda25 | 2427 | else |
ff50f9ed FT |
2428 | scmd_printk(KERN_INFO, cmd, |
2429 | "rejecting unknown extended message code %02x, length %d\n", | |
2430 | extended_msg[1], extended_msg[0]); | |
c28bda25 RZ |
2431 | |
2432 | msgout = MESSAGE_REJECT; | |
2433 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2434 | break; | |
2435 | } /* switch (tmp) */ | |
2436 | break; | |
2437 | case PHASE_MSGOUT: | |
2438 | len = 1; | |
2439 | data = &msgout; | |
2440 | hostdata->last_message = msgout; | |
2441 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2442 | if (msgout == ABORT) { | |
e3c3da67 | 2443 | local_irq_save(flags); |
1da177e4 | 2444 | #ifdef SUPPORT_TAGS |
c28bda25 | 2445 | cmd_free_tag(cmd); |
1da177e4 | 2446 | #else |
c28bda25 | 2447 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2448 | #endif |
c28bda25 RZ |
2449 | hostdata->connected = NULL; |
2450 | cmd->result = DID_ERROR << 16; | |
c28bda25 | 2451 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
e3c3da67 FT |
2452 | maybe_release_dma_irq(instance); |
2453 | local_irq_restore(flags); | |
2454 | cmd->scsi_done(cmd); | |
c28bda25 RZ |
2455 | return; |
2456 | } | |
2457 | msgout = NOP; | |
2458 | break; | |
2459 | case PHASE_CMDOUT: | |
2460 | len = cmd->cmd_len; | |
2461 | data = cmd->cmnd; | |
2462 | /* | |
2463 | * XXX for performance reasons, on machines with a | |
2464 | * PSEUDO-DMA architecture we should probably | |
2465 | * use the dma transfer function. | |
2466 | */ | |
2467 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2468 | break; | |
2469 | case PHASE_STATIN: | |
2470 | len = 1; | |
2471 | data = &tmp; | |
2472 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2473 | cmd->SCp.Status = tmp; | |
2474 | break; | |
2475 | default: | |
2476 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2477 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
2478 | } /* switch(phase) */ |
2479 | } /* if (tmp * SR_REQ) */ | |
2480 | } /* while (1) */ | |
1da177e4 LT |
2481 | } |
2482 | ||
2483 | /* | |
2484 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2485 | * | |
c28bda25 | 2486 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2487 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2488 | * nexus has been reestablished, |
c28bda25 | 2489 | * |
1da177e4 LT |
2490 | * Inputs : instance - this instance of the NCR5380. |
2491 | * | |
2492 | */ | |
2493 | ||
2494 | ||
e3f463b0 FT |
2495 | /* it might eventually prove necessary to do a dma setup on |
2496 | reselection, but it doesn't seem to be needed now -- sam */ | |
2497 | ||
c28bda25 | 2498 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2499 | { |
c28bda25 RZ |
2500 | SETUP_HOSTDATA(instance); |
2501 | unsigned char target_mask; | |
e3f463b0 | 2502 | unsigned char lun; |
1da177e4 | 2503 | #ifdef SUPPORT_TAGS |
c28bda25 | 2504 | unsigned char tag; |
1da177e4 | 2505 | #endif |
c28bda25 | 2506 | unsigned char msg[3]; |
e3f463b0 FT |
2507 | int __maybe_unused len; |
2508 | unsigned char __maybe_unused *data, __maybe_unused phase; | |
710ddd0d | 2509 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2510 | |
2511 | /* | |
2512 | * Disable arbitration, etc. since the host adapter obviously | |
2513 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2514 | */ | |
2515 | ||
2516 | NCR5380_write(MODE_REG, MR_BASE); | |
2517 | hostdata->restart_select = 1; | |
2518 | ||
2519 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2520 | ||
d65e634a | 2521 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2522 | |
2523 | /* | |
2524 | * At this point, we have detected that our SCSI ID is on the bus, | |
2525 | * SEL is true and BSY was false for at least one bus settle delay | |
2526 | * (400 ns). | |
2527 | * | |
2528 | * We must assert BSY ourselves, until the target drops the SEL | |
2529 | * signal. | |
2530 | */ | |
2531 | ||
2532 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2533 | ||
2534 | while (NCR5380_read(STATUS_REG) & SR_SEL) | |
2535 | ; | |
2536 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2537 | ||
2538 | /* | |
2539 | * Wait for target to go into MSGIN. | |
2540 | */ | |
2541 | ||
2542 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
2543 | ; | |
2544 | ||
e3f463b0 FT |
2545 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2546 | /* acknowledge toggle to MSGIN */ | |
2547 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); | |
2548 | ||
2549 | /* peek at the byte without really hitting the bus */ | |
2550 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
2551 | #else | |
c28bda25 RZ |
2552 | len = 1; |
2553 | data = msg; | |
2554 | phase = PHASE_MSGIN; | |
2555 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
e3f463b0 | 2556 | #endif |
c28bda25 RZ |
2557 | |
2558 | if (!(msg[0] & 0x80)) { | |
2559 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | |
2560 | spi_print_msg(msg); | |
2561 | do_abort(instance); | |
2562 | return; | |
2563 | } | |
2564 | lun = (msg[0] & 0x07); | |
1da177e4 | 2565 | |
e3f463b0 | 2566 | #if defined(SUPPORT_TAGS) && !defined(CONFIG_SUN3) |
c28bda25 RZ |
2567 | /* If the phase is still MSGIN, the target wants to send some more |
2568 | * messages. In case it supports tagged queuing, this is probably a | |
2569 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2570 | */ | |
2571 | tag = TAG_NONE; | |
ca513fc9 | 2572 | if (phase == PHASE_MSGIN && (hostdata->flags & FLAG_TAGGED_QUEUING)) { |
c28bda25 RZ |
2573 | /* Accept previous IDENTIFY message by clearing ACK */ |
2574 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2575 | len = 2; | |
2576 | data = msg + 1; | |
2577 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2578 | msg[1] == SIMPLE_QUEUE_TAG) | |
2579 | tag = msg[2]; | |
d65e634a | 2580 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2581 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2582 | } | |
1da177e4 | 2583 | #endif |
c28bda25 RZ |
2584 | |
2585 | /* | |
2586 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2587 | * just reestablished, and remove it from the disconnected queue. | |
2588 | */ | |
2589 | ||
710ddd0d | 2590 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 RZ |
2591 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
2592 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
1da177e4 | 2593 | #ifdef SUPPORT_TAGS |
c28bda25 | 2594 | && (tag == tmp->tag) |
1da177e4 | 2595 | #endif |
c28bda25 | 2596 | ) { |
c28bda25 RZ |
2597 | if (prev) { |
2598 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2599 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2600 | } else { |
2601 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2602 | hostdata->disconnected_queue = NEXT(tmp); | |
2603 | } | |
3130d905 | 2604 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2605 | break; |
2606 | } | |
1da177e4 | 2607 | } |
c28bda25 RZ |
2608 | |
2609 | if (!tmp) { | |
2610 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | |
1da177e4 | 2611 | #ifdef SUPPORT_TAGS |
c28bda25 | 2612 | "tag %d " |
1da177e4 | 2613 | #endif |
c28bda25 RZ |
2614 | "not in disconnected_queue.\n", |
2615 | HOSTNO, target_mask, lun | |
1da177e4 | 2616 | #ifdef SUPPORT_TAGS |
c28bda25 | 2617 | , tag |
1da177e4 | 2618 | #endif |
c28bda25 RZ |
2619 | ); |
2620 | /* | |
2621 | * Since we have an established nexus that we can't do anything | |
2622 | * with, we must abort it. | |
2623 | */ | |
2624 | do_abort(instance); | |
2625 | return; | |
2626 | } | |
1da177e4 | 2627 | |
e3f463b0 FT |
2628 | #if defined(CONFIG_SUN3) && defined(REAL_DMA) |
2629 | /* engage dma setup for the command we just saw */ | |
2630 | { | |
2631 | void *d; | |
2632 | unsigned long count; | |
2633 | ||
2634 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { | |
2635 | count = tmp->SCp.buffer->length; | |
2636 | d = sg_virt(tmp->SCp.buffer); | |
2637 | } else { | |
2638 | count = tmp->SCp.this_residual; | |
2639 | d = tmp->SCp.ptr; | |
2640 | } | |
2641 | /* setup this command for dma if not already */ | |
2642 | if ((count >= DMA_MIN_SIZE) && (sun3_dma_setup_done != tmp)) { | |
2643 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); | |
2644 | sun3_dma_setup_done = tmp; | |
2645 | } | |
2646 | } | |
2647 | ||
2648 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); | |
2649 | #endif | |
2650 | ||
c28bda25 RZ |
2651 | /* Accept message by clearing ACK */ |
2652 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2653 | |
e3f463b0 FT |
2654 | #if defined(SUPPORT_TAGS) && defined(CONFIG_SUN3) |
2655 | /* If the phase is still MSGIN, the target wants to send some more | |
2656 | * messages. In case it supports tagged queuing, this is probably a | |
2657 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2658 | */ | |
2659 | tag = TAG_NONE; | |
2660 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2661 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2662 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2663 | len = 2; | |
2664 | data = msg + 1; | |
2665 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2666 | msg[1] == SIMPLE_QUEUE_TAG) | |
2667 | tag = msg[2]; | |
2668 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at reselection\n" | |
2669 | HOSTNO, target_mask, lun, tag); | |
2670 | } | |
2671 | #endif | |
2672 | ||
c28bda25 | 2673 | hostdata->connected = tmp; |
9cb78c16 | 2674 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 | 2675 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
1da177e4 LT |
2676 | } |
2677 | ||
2678 | ||
2679 | /* | |
710ddd0d | 2680 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2681 | * |
2682 | * Purpose : abort a command | |
2683 | * | |
710ddd0d | 2684 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2685 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2686 | * used. |
2687 | * | |
b6c92b7e | 2688 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2689 | * |
c28bda25 RZ |
2690 | * XXX - there is no way to abort the command that is currently |
2691 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2692 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2693 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2694 | */ |
2695 | ||
2696 | static | |
710ddd0d | 2697 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2698 | { |
c28bda25 RZ |
2699 | struct Scsi_Host *instance = cmd->device->host; |
2700 | SETUP_HOSTDATA(instance); | |
710ddd0d | 2701 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2702 | unsigned long flags; |
1da177e4 | 2703 | |
1fa6b5fb | 2704 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2705 | |
c28bda25 RZ |
2706 | NCR5380_print_status(instance); |
2707 | ||
2708 | local_irq_save(flags); | |
1da177e4 | 2709 | |
d65e634a | 2710 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2711 | NCR5380_read(BUS_AND_STATUS_REG), |
2712 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2713 | |
2714 | #if 1 | |
c28bda25 RZ |
2715 | /* |
2716 | * Case 1 : If the command is the currently executing command, | |
2717 | * we'll set the aborted flag and return control so that | |
2718 | * information transfer routine can exit cleanly. | |
2719 | */ | |
1da177e4 | 2720 | |
c28bda25 | 2721 | if (hostdata->connected == cmd) { |
1da177e4 | 2722 | |
d65e634a | 2723 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2724 | /* |
2725 | * We should perform BSY checking, and make sure we haven't slipped | |
2726 | * into BUS FREE. | |
2727 | */ | |
1da177e4 | 2728 | |
c28bda25 RZ |
2729 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2730 | /* | |
2731 | * Since we can't change phases until we've completed the current | |
2732 | * handshake, we have to source or sink a byte of data if the current | |
2733 | * phase is not MSGOUT. | |
2734 | */ | |
1da177e4 | 2735 | |
c28bda25 RZ |
2736 | /* |
2737 | * Return control to the executing NCR drive so we can clear the | |
2738 | * aborted flag and get back into our main loop. | |
2739 | */ | |
1da177e4 | 2740 | |
c28bda25 RZ |
2741 | if (do_abort(instance) == 0) { |
2742 | hostdata->aborted = 1; | |
2743 | hostdata->connected = NULL; | |
2744 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2745 | #ifdef SUPPORT_TAGS |
c28bda25 | 2746 | cmd_free_tag(cmd); |
1da177e4 | 2747 | #else |
c28bda25 | 2748 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2749 | #endif |
e3c3da67 | 2750 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2751 | local_irq_restore(flags); |
2752 | cmd->scsi_done(cmd); | |
2b0f834c | 2753 | return SUCCESS; |
c28bda25 | 2754 | } else { |
e3c3da67 | 2755 | local_irq_restore(flags); |
c28bda25 | 2756 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
2b0f834c | 2757 | return FAILED; |
c28bda25 RZ |
2758 | } |
2759 | } | |
1da177e4 LT |
2760 | #endif |
2761 | ||
c28bda25 RZ |
2762 | /* |
2763 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2764 | * from the issue queue. | |
2765 | */ | |
710ddd0d FT |
2766 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2767 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2768 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2769 | if (cmd == tmp) { | |
2770 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2771 | (*prev) = NEXT(tmp); | |
3130d905 | 2772 | SET_NEXT(tmp, NULL); |
c28bda25 | 2773 | tmp->result = DID_ABORT << 16; |
e3c3da67 | 2774 | maybe_release_dma_irq(instance); |
c28bda25 | 2775 | local_irq_restore(flags); |
d65e634a | 2776 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2777 | HOSTNO); |
2778 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2779 | * yet... */ | |
2780 | tmp->scsi_done(tmp); | |
2b0f834c | 2781 | return SUCCESS; |
c28bda25 | 2782 | } |
1da177e4 LT |
2783 | } |
2784 | ||
c28bda25 RZ |
2785 | /* |
2786 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2787 | * and let the high level SCSI driver retry at a later time or | |
2788 | * issue a reset. | |
2789 | * | |
2790 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2791 | * and handling them cleanly in this situation would make the common | |
2792 | * case of noresets less efficient, and would pollute our code. So, | |
2793 | * we fail. | |
2794 | */ | |
1da177e4 | 2795 | |
c28bda25 RZ |
2796 | if (hostdata->connected) { |
2797 | local_irq_restore(flags); | |
d65e634a | 2798 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2799 | return FAILED; |
c28bda25 | 2800 | } |
1da177e4 | 2801 | |
c28bda25 RZ |
2802 | /* |
2803 | * Case 4: If the command is currently disconnected from the bus, and | |
2804 | * there are no connected commands, we reconnect the I_T_L or | |
2805 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2806 | * an abort message. | |
2807 | * | |
2808 | * This case is especially ugly. In order to reestablish the nexus, we | |
2809 | * need to call NCR5380_select(). The easiest way to implement this | |
2810 | * function was to abort if the bus was busy, and let the interrupt | |
2811 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2812 | * where necessary, meaning interrupts need to be enabled. | |
2813 | * | |
2814 | * When interrupts are enabled, the queues may change - so we | |
2815 | * can't remove it from the disconnected queue before selecting it | |
2816 | * because that could cause a failure in hashing the nexus if that | |
2817 | * device reselected. | |
2818 | * | |
2819 | * Since the queues may change, we can't use the pointers from when we | |
2820 | * first locate it. | |
2821 | * | |
2822 | * So, we must first locate the command, and if NCR5380_select() | |
2823 | * succeeds, then issue the abort, relocate the command and remove | |
2824 | * it from the disconnected queue. | |
2825 | */ | |
2826 | ||
710ddd0d | 2827 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2828 | tmp = NEXT(tmp)) { |
2829 | if (cmd == tmp) { | |
2830 | local_irq_restore(flags); | |
d65e634a | 2831 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2832 | |
76f13b93 | 2833 | if (NCR5380_select(instance, cmd)) |
2b0f834c | 2834 | return FAILED; |
1da177e4 | 2835 | |
d65e634a | 2836 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2837 | |
2838 | do_abort(instance); | |
2839 | ||
2840 | local_irq_save(flags); | |
710ddd0d FT |
2841 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2842 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2843 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2844 | if (cmd == tmp) { | |
2845 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2846 | *prev = NEXT(tmp); | |
3130d905 | 2847 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2848 | tmp->result = DID_ABORT << 16; |
2849 | /* We must unlock the tag/LUN immediately here, since the | |
2850 | * target goes to BUS FREE and doesn't send us another | |
2851 | * message (COMMAND_COMPLETE or the like) | |
2852 | */ | |
1da177e4 | 2853 | #ifdef SUPPORT_TAGS |
c28bda25 | 2854 | cmd_free_tag(tmp); |
1da177e4 | 2855 | #else |
c28bda25 | 2856 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2857 | #endif |
e3c3da67 | 2858 | maybe_release_dma_irq(instance); |
c28bda25 RZ |
2859 | local_irq_restore(flags); |
2860 | tmp->scsi_done(tmp); | |
2b0f834c | 2861 | return SUCCESS; |
c28bda25 RZ |
2862 | } |
2863 | } | |
1da177e4 LT |
2864 | } |
2865 | } | |
2866 | ||
e3c3da67 FT |
2867 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2868 | * possible at all) At least, we should check if the lock could be | |
2869 | * released after the abort, in case it is kept due to some bug. | |
2870 | */ | |
2871 | maybe_release_dma_irq(instance); | |
2872 | local_irq_restore(flags); | |
2873 | ||
c28bda25 RZ |
2874 | /* |
2875 | * Case 5 : If we reached this point, the command was not found in any of | |
2876 | * the queues. | |
2877 | * | |
2878 | * We probably reached this point because of an unlikely race condition | |
2879 | * between the command completing successfully and the abortion code, | |
2880 | * so we won't panic, but we will notify the user in case something really | |
2881 | * broke. | |
2882 | */ | |
1da177e4 | 2883 | |
ad361c98 | 2884 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2885 | |
2b0f834c | 2886 | return FAILED; |
1da177e4 LT |
2887 | } |
2888 | ||
2889 | ||
c28bda25 | 2890 | /* |
710ddd0d | 2891 | * Function : int NCR5380_reset (struct scsi_cmnd *cmd) |
c28bda25 | 2892 | * |
1da177e4 LT |
2893 | * Purpose : reset the SCSI bus. |
2894 | * | |
2b0f834c | 2895 | * Returns : SUCCESS or FAILURE |
1da177e4 | 2896 | * |
c28bda25 | 2897 | */ |
1da177e4 | 2898 | |
710ddd0d | 2899 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2900 | { |
e3c3da67 FT |
2901 | struct Scsi_Host *instance = cmd->device->host; |
2902 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
c28bda25 RZ |
2903 | int i; |
2904 | unsigned long flags; | |
2b0f834c | 2905 | #if defined(RESET_RUN_DONE) |
710ddd0d | 2906 | struct scsi_cmnd *connected, *disconnected_queue; |
1da177e4 LT |
2907 | #endif |
2908 | ||
e3c3da67 | 2909 | NCR5380_print_status(instance); |
c28bda25 RZ |
2910 | |
2911 | /* get in phase */ | |
2912 | NCR5380_write(TARGET_COMMAND_REG, | |
2913 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); | |
2914 | /* assert RST */ | |
2915 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
2916 | udelay(40); | |
2917 | /* reset NCR registers */ | |
2918 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2919 | NCR5380_write(MODE_REG, MR_BASE); | |
2920 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2921 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2922 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get | |
2923 | * through anymore ... */ | |
2924 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
2925 | ||
2b0f834c MS |
2926 | /* MSch 20140115 - looking at the generic NCR5380 driver, all of this |
2927 | * should go. | |
2928 | * Catch-22: if we don't clear all queues, the SCSI driver lock will | |
2929 | * not be reset by atari_scsi_reset()! | |
2930 | */ | |
2931 | ||
2932 | #if defined(RESET_RUN_DONE) | |
2933 | /* XXX Should now be done by midlevel code, but it's broken XXX */ | |
c28bda25 RZ |
2934 | /* XXX see below XXX */ |
2935 | ||
2936 | /* MSch: old-style reset: actually abort all command processing here */ | |
2937 | ||
2938 | /* After the reset, there are no more connected or disconnected commands | |
2939 | * and no busy units; to avoid problems with re-inserting the commands | |
2940 | * into the issue_queue (via scsi_done()), the aborted commands are | |
2941 | * remembered in local variables first. | |
2942 | */ | |
2943 | local_irq_save(flags); | |
710ddd0d | 2944 | connected = (struct scsi_cmnd *)hostdata->connected; |
c28bda25 | 2945 | hostdata->connected = NULL; |
710ddd0d | 2946 | disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue; |
c28bda25 | 2947 | hostdata->disconnected_queue = NULL; |
1da177e4 | 2948 | #ifdef SUPPORT_TAGS |
c28bda25 | 2949 | free_all_tags(); |
1da177e4 | 2950 | #endif |
c28bda25 RZ |
2951 | for (i = 0; i < 8; ++i) |
2952 | hostdata->busy[i] = 0; | |
1da177e4 | 2953 | #ifdef REAL_DMA |
c28bda25 | 2954 | hostdata->dma_len = 0; |
1da177e4 | 2955 | #endif |
c28bda25 | 2956 | local_irq_restore(flags); |
1da177e4 | 2957 | |
c28bda25 RZ |
2958 | /* In order to tell the mid-level code which commands were aborted, |
2959 | * set the command status to DID_RESET and call scsi_done() !!! | |
2960 | * This ultimately aborts processing of these commands in the mid-level. | |
2961 | */ | |
1da177e4 | 2962 | |
c28bda25 | 2963 | if ((cmd = connected)) { |
d65e634a | 2964 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 RZ |
2965 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2966 | cmd->scsi_done(cmd); | |
2967 | } | |
1da177e4 | 2968 | |
c28bda25 RZ |
2969 | for (i = 0; (cmd = disconnected_queue); ++i) { |
2970 | disconnected_queue = NEXT(cmd); | |
3130d905 | 2971 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
2972 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2973 | cmd->scsi_done(cmd); | |
2974 | } | |
2975 | if (i > 0) | |
d65e634a | 2976 | dprintk(NDEBUG_ABORT, "scsi: reset aborted %d disconnected command(s)\n", i); |
1da177e4 | 2977 | |
c28bda25 RZ |
2978 | /* The Falcon lock should be released after a reset... |
2979 | */ | |
2980 | /* ++guenther: moved to atari_scsi_reset(), to prevent a race between | |
2981 | * unlocking and enabling dma interrupt. | |
2982 | */ | |
2983 | /* falcon_release_lock_if_possible( hostdata );*/ | |
1da177e4 | 2984 | |
c28bda25 RZ |
2985 | /* since all commands have been explicitly terminated, we need to tell |
2986 | * the midlevel code that the reset was SUCCESSFUL, and there is no | |
2987 | * need to 'wake up' the commands by a request_sense | |
2988 | */ | |
2b0f834c | 2989 | return SUCCESS; |
1da177e4 LT |
2990 | #else /* 1 */ |
2991 | ||
c28bda25 RZ |
2992 | /* MSch: new-style reset handling: let the mid-level do what it can */ |
2993 | ||
2994 | /* ++guenther: MID-LEVEL IS STILL BROKEN. | |
2995 | * Mid-level is supposed to requeue all commands that were active on the | |
2996 | * various low-level queues. In fact it does this, but that's not enough | |
2997 | * because all these commands are subject to timeout. And if a timeout | |
2998 | * happens for any removed command, *_abort() is called but all queues | |
2999 | * are now empty. Abort then gives up the falcon lock, which is fatal, | |
3000 | * since the mid-level will queue more commands and must have the lock | |
3001 | * (it's all happening inside timer interrupt handler!!). | |
3002 | * Even worse, abort will return NOT_RUNNING for all those commands not | |
3003 | * on any queue, so they won't be retried ... | |
3004 | * | |
3005 | * Conclusion: either scsi.c disables timeout for all resetted commands | |
3006 | * immediately, or we lose! As of linux-2.0.20 it doesn't. | |
3007 | */ | |
3008 | ||
3009 | /* After the reset, there are no more connected or disconnected commands | |
3010 | * and no busy units; so clear the low-level status here to avoid | |
3011 | * conflicts when the mid-level code tries to wake up the affected | |
3012 | * commands! | |
3013 | */ | |
3014 | ||
3015 | if (hostdata->issue_queue) | |
d65e634a | 3016 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
c28bda25 | 3017 | if (hostdata->connected) |
d65e634a | 3018 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 | 3019 | if (hostdata->disconnected_queue) |
d65e634a | 3020 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
c28bda25 RZ |
3021 | |
3022 | local_irq_save(flags); | |
3023 | hostdata->issue_queue = NULL; | |
3024 | hostdata->connected = NULL; | |
3025 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 3026 | #ifdef SUPPORT_TAGS |
ca513fc9 | 3027 | free_all_tags(hostdata); |
1da177e4 | 3028 | #endif |
c28bda25 RZ |
3029 | for (i = 0; i < 8; ++i) |
3030 | hostdata->busy[i] = 0; | |
1da177e4 | 3031 | #ifdef REAL_DMA |
c28bda25 | 3032 | hostdata->dma_len = 0; |
1da177e4 | 3033 | #endif |
e3c3da67 FT |
3034 | |
3035 | maybe_release_dma_irq(instance); | |
c28bda25 | 3036 | local_irq_restore(flags); |
1da177e4 | 3037 | |
c28bda25 | 3038 | /* we did no complete reset of all commands, so a wakeup is required */ |
2b0f834c | 3039 | return SUCCESS; |
1da177e4 LT |
3040 | #endif /* 1 */ |
3041 | } |