Commit | Line | Data |
---|---|---|
c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * For more information, please consult |
1da177e4 LT |
15 | * |
16 | * NCR 5380 Family | |
17 | * SCSI Protocol Controller | |
18 | * Databook | |
19 | * | |
20 | * NCR Microelectronics | |
21 | * 1635 Aeroplaza Drive | |
22 | * Colorado Springs, CO 80916 | |
23 | * 1+ (719) 578-3400 | |
24 | * 1+ (800) 334-5454 | |
25 | */ | |
26 | ||
27 | /* | |
28 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
29 | * this file, too: | |
30 | * | |
31 | * - Some of the debug statements were incorrect (undefined variables and the | |
32 | * like). I fixed that. | |
33 | * | |
34 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
35 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
36 | * in the #if statement. | |
37 | * | |
38 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
39 | * phase after starting the DMA. It has nothing more to do. | |
40 | * | |
41 | * - The interrupt service routine should run main after end of DMA, too (not | |
42 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
43 | * for more interrupts after running main, since a DMA process may have | |
44 | * been started and interrupts are turned on now. The new int could happen | |
45 | * inside the execution of NCR5380_intr(), leading to recursive | |
46 | * calls. | |
47 | * | |
48 | * - I've added a function merge_contiguous_buffers() that tries to | |
49 | * merge scatter-gather buffers that are located at contiguous | |
50 | * physical addresses and can be processed with the same DMA setup. | |
51 | * Since most scatter-gather operations work on a page (4K) of | |
52 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
53 | * DMA setup actions are saved. | |
54 | * | |
55 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
56 | * and USLEEP, because these were messing up readability and will never be | |
57 | * needed for Atari SCSI. | |
c28bda25 | 58 | * |
1da177e4 LT |
59 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
60 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
61 | * interrupt. | |
62 | * | |
63 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
64 | * constructs. In my eyes, this made the source rather unreadable, so I | |
65 | * finally replaced that by the *_PRINTK() macros. | |
66 | * | |
67 | */ | |
68 | ||
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 | */ | |
db9dff36 | 74 | #include <scsi/scsi_dbg.h> |
1abfd370 | 75 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
76 | |
77 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 RZ |
78 | #define LIST(x, y) \ |
79 | do { \ | |
80 | printk("LINE:%d Adding %p to %p\n", \ | |
81 | __LINE__, (void*)(x), (void*)(y)); \ | |
82 | if ((x) == (y)) \ | |
83 | udelay(5); \ | |
84 | } while (0) | |
85 | #define REMOVE(w, x, y, z) \ | |
86 | do { \ | |
87 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
88 | __LINE__, (void*)(w), (void*)(x), \ | |
89 | (void*)(y), (void*)(z)); \ | |
90 | if ((x) == (y)) \ | |
91 | udelay(5); \ | |
92 | } while (0) | |
1da177e4 LT |
93 | #else |
94 | #define LIST(x,y) | |
95 | #define REMOVE(w,x,y,z) | |
96 | #endif | |
97 | ||
98 | #ifndef notyet | |
99 | #undef LINKED | |
100 | #endif | |
101 | ||
102 | /* | |
103 | * Design | |
104 | * Issues : | |
105 | * | |
106 | * The other Linux SCSI drivers were written when Linux was Intel PC-only, | |
107 | * and specifically for each board rather than each chip. This makes their | |
108 | * adaptation to platforms like the Mac (Some of which use NCR5380's) | |
109 | * more difficult than it has to be. | |
110 | * | |
111 | * Also, many of the SCSI drivers were written before the command queuing | |
c28bda25 | 112 | * routines were implemented, meaning their implementations of queued |
1da177e4 LT |
113 | * commands were hacked on rather than designed in from the start. |
114 | * | |
c28bda25 | 115 | * When I designed the Linux SCSI drivers I figured that |
1da177e4 LT |
116 | * while having two different SCSI boards in a system might be useful |
117 | * for debugging things, two of the same type wouldn't be used. | |
118 | * Well, I was wrong and a number of users have mailed me about running | |
119 | * multiple high-performance SCSI boards in a server. | |
120 | * | |
c28bda25 | 121 | * Finally, when I get questions from users, I have no idea what |
1da177e4 LT |
122 | * revision of my driver they are running. |
123 | * | |
124 | * This driver attempts to address these problems : | |
c28bda25 | 125 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 126 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 127 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
128 | * memory mapped) and drops this file in their 'C' wrapper. |
129 | * | |
c28bda25 | 130 | * As far as command queueing, two queues are maintained for |
1da177e4 | 131 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
132 | * and commands that are currently executing. This means that an |
133 | * unlimited number of commands may be queued, letting | |
134 | * more commands propagate from the higher driver levels giving higher | |
135 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
136 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
137 | * while a command is already executing. |
138 | * | |
c28bda25 | 139 | * To solve the multiple-boards-in-the-same-system problem, |
1da177e4 LT |
140 | * there is a separate instance structure for each instance |
141 | * of a 5380 in the system. So, multiple NCR5380 drivers will | |
142 | * be able to coexist with appropriate changes to the high level | |
c28bda25 | 143 | * SCSI code. |
1da177e4 | 144 | * |
c28bda25 | 145 | * Issues specific to the NCR5380 : |
1da177e4 | 146 | * |
c28bda25 RZ |
147 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
148 | * piece of hardware that requires you to sit in a loop polling for | |
149 | * the REQ signal as long as you are connected. Some devices are | |
150 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
1da177e4 | 151 | * while doing long seek operations. |
c28bda25 | 152 | * |
1da177e4 LT |
153 | * The workaround for this is to keep track of devices that have |
154 | * disconnected. If the device hasn't disconnected, for commands that | |
c28bda25 | 155 | * should disconnect, we do something like |
1da177e4 LT |
156 | * |
157 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
c28bda25 RZ |
158 | * |
159 | * Some tweaking of N and M needs to be done. An algorithm based | |
1da177e4 | 160 | * on "time to data" would give the best results as long as short time |
c28bda25 | 161 | * to datas (ie, on the same track) were considered, however these |
1da177e4 LT |
162 | * broken devices are the exception rather than the rule and I'd rather |
163 | * spend my time optimizing for the normal case. | |
164 | * | |
165 | * Architecture : | |
166 | * | |
167 | * At the heart of the design is a coroutine, NCR5380_main, | |
168 | * which is started when not running by the interrupt handler, | |
169 | * timer, and queue command function. It attempts to establish | |
c28bda25 RZ |
170 | * I_T_L or I_T_L_Q nexuses by removing the commands from the |
171 | * issue queue and calling NCR5380_select() if a nexus | |
172 | * is not established. | |
1da177e4 LT |
173 | * |
174 | * Once a nexus is established, the NCR5380_information_transfer() | |
175 | * phase goes through the various phases as instructed by the target. | |
176 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
177 | * the command structure is placed into the per instance disconnected | |
178 | * queue, and NCR5380_main tries to find more work. If USLEEP | |
179 | * was defined, and the target is idle for too long, the system | |
180 | * will try to sleep. | |
181 | * | |
182 | * If a command has disconnected, eventually an interrupt will trigger, | |
183 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
184 | * to reestablish a nexus. This will run main if necessary. | |
185 | * | |
c28bda25 | 186 | * On command termination, the done function will be called as |
1da177e4 LT |
187 | * appropriate. |
188 | * | |
c28bda25 | 189 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
190 | * structures, being initialized after the command is connected |
191 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
192 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
193 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
194 | */ | |
195 | ||
196 | /* | |
197 | * Using this file : | |
198 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 199 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
200 | * and macros and include this file in your driver. |
201 | * | |
c28bda25 | 202 | * These macros control options : |
1da177e4 | 203 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 204 | * for commands that return with a CHECK CONDITION status. |
1da177e4 LT |
205 | * |
206 | * LINKED - if defined, linked commands are supported. | |
207 | * | |
208 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
209 | * | |
210 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
211 | * | |
212 | * These macros MUST be defined : | |
c28bda25 | 213 | * |
1da177e4 LT |
214 | * NCR5380_read(register) - read from the specified register |
215 | * | |
c28bda25 | 216 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 LT |
217 | * |
218 | * Either real DMA *or* pseudo DMA may be implemented | |
c28bda25 | 219 | * REAL functions : |
1da177e4 | 220 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 221 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
222 | * that they were able to program the controller for. |
223 | * | |
c28bda25 | 224 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
225 | * available as NCR5380_i386_dma_write_setup, |
226 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
227 | * | |
228 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
229 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
230 | * NCR5380_dma_residual(instance); - residual count | |
231 | * | |
232 | * PSEUDO functions : | |
233 | * NCR5380_pwrite(instance, src, count) | |
234 | * NCR5380_pread(instance, dst, count); | |
235 | * | |
236 | * If nothing specific to this implementation needs doing (ie, with external | |
c28bda25 RZ |
237 | * hardware), you must also define |
238 | * | |
1da177e4 LT |
239 | * NCR5380_queue_command |
240 | * NCR5380_reset | |
241 | * NCR5380_abort | |
1da177e4 | 242 | * |
c28bda25 | 243 | * to be the global entry points into the specific driver, ie |
1da177e4 LT |
244 | * #define NCR5380_queue_command t128_queue_command. |
245 | * | |
246 | * If this is not done, the routines will be defined as static functions | |
247 | * with the NCR5380* names and the user must provide a globally | |
248 | * accessible wrapper function. | |
249 | * | |
250 | * The generic driver is initialized by calling NCR5380_init(instance), | |
c28bda25 | 251 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 | 252 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
8c32513b | 253 | * possible) function may be used. |
1da177e4 LT |
254 | */ |
255 | ||
256 | static struct Scsi_Host *first_instance = NULL; | |
d0be4a7d | 257 | static struct scsi_host_template *the_template = NULL; |
1da177e4 LT |
258 | |
259 | /* Macros ease life... :-) */ | |
260 | #define SETUP_HOSTDATA(in) \ | |
261 | struct NCR5380_hostdata *hostdata = \ | |
262 | (struct NCR5380_hostdata *)(in)->hostdata | |
263 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
264 | ||
710ddd0d | 265 | #define NEXT(cmd) ((struct scsi_cmnd *)(cmd)->host_scribble) |
3130d905 | 266 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) |
710ddd0d | 267 | #define NEXTADDR(cmd) ((struct scsi_cmnd **)&(cmd)->host_scribble) |
1da177e4 LT |
268 | |
269 | #define HOSTNO instance->host_no | |
270 | #define H_NO(cmd) (cmd)->device->host->host_no | |
271 | ||
272 | #ifdef SUPPORT_TAGS | |
273 | ||
274 | /* | |
275 | * Functions for handling tagged queuing | |
276 | * ===================================== | |
277 | * | |
278 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
279 | * | |
280 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
281 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
282 | * command has been preempted for a long time. My solution: a bitfield for | |
283 | * remembering used tags. | |
284 | * | |
285 | * There's also the problem that each target has a certain queue size, but we | |
286 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
287 | * returned. So, in this case, the driver internal queue size assumption is | |
288 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
289 | * target. The command is returned to the mid-level, but with status changed | |
290 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL | |
291 | * correctly. | |
292 | * | |
293 | * We're also not allowed running tagged commands as long as an untagged | |
294 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
295 | * condition _must_ be untagged. To keep track whether an untagged command has | |
296 | * been issued, the host->busy array is still employed, as it is without | |
297 | * support for tagged queuing. | |
298 | * | |
299 | * One could suspect that there are possible race conditions between | |
300 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
301 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
302 | * which already guaranteed to be running at most once. It is also the only | |
303 | * place where tags/LUNs are allocated. So no other allocation can slip | |
304 | * between that pair, there could only happen a reselection, which can free a | |
305 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
306 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
307 | */ | |
308 | ||
1da177e4 | 309 | typedef struct { |
c28bda25 RZ |
310 | DECLARE_BITMAP(allocated, MAX_TAGS); |
311 | int nr_allocated; | |
312 | int queue_size; | |
1da177e4 LT |
313 | } TAG_ALLOC; |
314 | ||
c28bda25 | 315 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
1da177e4 LT |
316 | |
317 | ||
c28bda25 | 318 | static void __init init_tags(void) |
1da177e4 | 319 | { |
c28bda25 RZ |
320 | int target, lun; |
321 | TAG_ALLOC *ta; | |
322 | ||
323 | if (!setup_use_tagged_queuing) | |
324 | return; | |
325 | ||
326 | for (target = 0; target < 8; ++target) { | |
327 | for (lun = 0; lun < 8; ++lun) { | |
328 | ta = &TagAlloc[target][lun]; | |
329 | bitmap_zero(ta->allocated, MAX_TAGS); | |
330 | ta->nr_allocated = 0; | |
331 | /* At the beginning, assume the maximum queue size we could | |
332 | * support (MAX_TAGS). This value will be decreased if the target | |
333 | * returns QUEUE_FULL status. | |
334 | */ | |
335 | ta->queue_size = MAX_TAGS; | |
336 | } | |
1da177e4 | 337 | } |
1da177e4 LT |
338 | } |
339 | ||
340 | ||
341 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
342 | * busy by an untagged command. If the command should use tagged queuing, also | |
343 | * check that there is a free tag and the target's queue won't overflow. This | |
344 | * function should be called with interrupts disabled to avoid race | |
345 | * conditions. | |
c28bda25 | 346 | */ |
1da177e4 | 347 | |
710ddd0d | 348 | static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 349 | { |
9cb78c16 | 350 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
351 | SETUP_HOSTDATA(cmd->device->host); |
352 | ||
9cb78c16 | 353 | if (hostdata->busy[cmd->device->id] & (1 << lun)) |
c28bda25 RZ |
354 | return 1; |
355 | if (!should_be_tagged || | |
356 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) | |
357 | return 0; | |
9cb78c16 HR |
358 | if (TagAlloc[cmd->device->id][lun].nr_allocated >= |
359 | TagAlloc[cmd->device->id][lun].queue_size) { | |
d65e634a | 360 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
9cb78c16 | 361 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
362 | return 1; |
363 | } | |
364 | return 0; | |
1da177e4 LT |
365 | } |
366 | ||
367 | ||
368 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
369 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
370 | * untagged. | |
371 | */ | |
372 | ||
710ddd0d | 373 | static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) |
1da177e4 | 374 | { |
9cb78c16 | 375 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
376 | SETUP_HOSTDATA(cmd->device->host); |
377 | ||
378 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
379 | * an untagged command. | |
380 | */ | |
381 | if (!should_be_tagged || | |
382 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) { | |
383 | cmd->tag = TAG_NONE; | |
9cb78c16 | 384 | hostdata->busy[cmd->device->id] |= (1 << lun); |
d65e634a | 385 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
9cb78c16 | 386 | "command\n", H_NO(cmd), cmd->device->id, lun); |
c28bda25 | 387 | } else { |
9cb78c16 | 388 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][lun]; |
c28bda25 RZ |
389 | |
390 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
391 | set_bit(cmd->tag, ta->allocated); | |
392 | ta->nr_allocated++; | |
d65e634a | 393 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
c28bda25 RZ |
394 | "(now %d tags in use)\n", |
395 | H_NO(cmd), cmd->tag, cmd->device->id, | |
9cb78c16 | 396 | lun, ta->nr_allocated); |
c28bda25 | 397 | } |
1da177e4 LT |
398 | } |
399 | ||
400 | ||
401 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
402 | * unlock the LUN. | |
403 | */ | |
404 | ||
710ddd0d | 405 | static void cmd_free_tag(struct scsi_cmnd *cmd) |
1da177e4 | 406 | { |
9cb78c16 | 407 | u8 lun = cmd->device->lun; |
c28bda25 RZ |
408 | SETUP_HOSTDATA(cmd->device->host); |
409 | ||
410 | if (cmd->tag == TAG_NONE) { | |
9cb78c16 | 411 | hostdata->busy[cmd->device->id] &= ~(1 << lun); |
d65e634a | 412 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
9cb78c16 | 413 | H_NO(cmd), cmd->device->id, lun); |
c28bda25 RZ |
414 | } else if (cmd->tag >= MAX_TAGS) { |
415 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
416 | H_NO(cmd), cmd->tag); | |
417 | } else { | |
9cb78c16 | 418 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][lun]; |
c28bda25 RZ |
419 | clear_bit(cmd->tag, ta->allocated); |
420 | ta->nr_allocated--; | |
d65e634a | 421 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
9cb78c16 | 422 | H_NO(cmd), cmd->tag, cmd->device->id, lun); |
c28bda25 | 423 | } |
1da177e4 LT |
424 | } |
425 | ||
426 | ||
c28bda25 | 427 | static void free_all_tags(void) |
1da177e4 | 428 | { |
c28bda25 RZ |
429 | int target, lun; |
430 | TAG_ALLOC *ta; | |
431 | ||
432 | if (!setup_use_tagged_queuing) | |
433 | return; | |
434 | ||
435 | for (target = 0; target < 8; ++target) { | |
436 | for (lun = 0; lun < 8; ++lun) { | |
437 | ta = &TagAlloc[target][lun]; | |
438 | bitmap_zero(ta->allocated, MAX_TAGS); | |
439 | ta->nr_allocated = 0; | |
440 | } | |
1da177e4 | 441 | } |
1da177e4 LT |
442 | } |
443 | ||
444 | #endif /* SUPPORT_TAGS */ | |
445 | ||
446 | ||
447 | /* | |
710ddd0d | 448 | * Function: void merge_contiguous_buffers( struct scsi_cmnd *cmd ) |
1da177e4 LT |
449 | * |
450 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
451 | * transfer. This is possible if the scatter buffers lie on | |
452 | * physical contiguous addresses. | |
453 | * | |
710ddd0d | 454 | * Parameters: struct scsi_cmnd *cmd |
1da177e4 | 455 | * The command to work on. The first scatter buffer's data are |
25985edc | 456 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
457 | */ |
458 | ||
710ddd0d | 459 | static void merge_contiguous_buffers(struct scsi_cmnd *cmd) |
1da177e4 | 460 | { |
c28bda25 | 461 | unsigned long endaddr; |
1da177e4 | 462 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
463 | unsigned long oldlen = cmd->SCp.this_residual; |
464 | int cnt = 1; | |
1da177e4 LT |
465 | #endif |
466 | ||
c28bda25 RZ |
467 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
468 | cmd->SCp.buffers_residual && | |
5a1cb47f | 469 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 470 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 471 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 472 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 473 | ++cnt; |
1da177e4 | 474 | #endif |
c28bda25 RZ |
475 | ++cmd->SCp.buffer; |
476 | --cmd->SCp.buffers_residual; | |
477 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
478 | endaddr += cmd->SCp.buffer->length; | |
479 | } | |
1da177e4 | 480 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 481 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 482 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 483 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 LT |
484 | #endif |
485 | } | |
486 | ||
487 | /* | |
710ddd0d | 488 | * Function : void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 489 | * |
c28bda25 | 490 | * Purpose : initialize the saved data pointers for cmd to point to the |
1da177e4 LT |
491 | * start of the buffer. |
492 | * | |
710ddd0d | 493 | * Inputs : cmd - scsi_cmnd structure to have pointers reset. |
1da177e4 LT |
494 | */ |
495 | ||
710ddd0d | 496 | static inline void initialize_SCp(struct scsi_cmnd *cmd) |
1da177e4 | 497 | { |
c28bda25 RZ |
498 | /* |
499 | * Initialize the Scsi Pointer field so that all of the commands in the | |
500 | * various queues are valid. | |
1da177e4 | 501 | */ |
c28bda25 | 502 | |
9e0fe44d BH |
503 | if (scsi_bufflen(cmd)) { |
504 | cmd->SCp.buffer = scsi_sglist(cmd); | |
505 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 506 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
507 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
508 | /* ++roman: Try to merge some scatter-buffers if they are at | |
509 | * contiguous physical addresses. | |
510 | */ | |
511 | merge_contiguous_buffers(cmd); | |
512 | } else { | |
513 | cmd->SCp.buffer = NULL; | |
514 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
515 | cmd->SCp.ptr = NULL; |
516 | cmd->SCp.this_residual = 0; | |
c28bda25 | 517 | } |
1da177e4 LT |
518 | } |
519 | ||
1da177e4 LT |
520 | #include <linux/delay.h> |
521 | ||
522 | #if NDEBUG | |
523 | static struct { | |
c28bda25 RZ |
524 | unsigned char mask; |
525 | const char *name; | |
526 | } signals[] = { | |
527 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
528 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
529 | { SR_SEL, "SEL" }, {0, NULL} | |
530 | }, basrs[] = { | |
531 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
532 | }, icrs[] = { | |
533 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
534 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
535 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
536 | {0, NULL} | |
537 | }, mrs[] = { | |
538 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
539 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
540 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
541 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
542 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
543 | {0, NULL} | |
544 | }; | |
1da177e4 LT |
545 | |
546 | /* | |
547 | * Function : void NCR5380_print(struct Scsi_Host *instance) | |
548 | * | |
549 | * Purpose : print the SCSI bus signals for debugging purposes | |
550 | * | |
551 | * Input : instance - which NCR5380 | |
552 | */ | |
553 | ||
c28bda25 RZ |
554 | static void NCR5380_print(struct Scsi_Host *instance) |
555 | { | |
556 | unsigned char status, data, basr, mr, icr, i; | |
557 | unsigned long flags; | |
558 | ||
559 | local_irq_save(flags); | |
560 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
561 | status = NCR5380_read(STATUS_REG); | |
562 | mr = NCR5380_read(MODE_REG); | |
563 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
564 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
565 | local_irq_restore(flags); | |
566 | printk("STATUS_REG: %02x ", status); | |
567 | for (i = 0; signals[i].mask; ++i) | |
568 | if (status & signals[i].mask) | |
569 | printk(",%s", signals[i].name); | |
570 | printk("\nBASR: %02x ", basr); | |
571 | for (i = 0; basrs[i].mask; ++i) | |
572 | if (basr & basrs[i].mask) | |
573 | printk(",%s", basrs[i].name); | |
574 | printk("\nICR: %02x ", icr); | |
575 | for (i = 0; icrs[i].mask; ++i) | |
576 | if (icr & icrs[i].mask) | |
577 | printk(",%s", icrs[i].name); | |
578 | printk("\nMODE: %02x ", mr); | |
579 | for (i = 0; mrs[i].mask; ++i) | |
580 | if (mr & mrs[i].mask) | |
581 | printk(",%s", mrs[i].name); | |
582 | printk("\n"); | |
1da177e4 LT |
583 | } |
584 | ||
585 | static struct { | |
c28bda25 RZ |
586 | unsigned char value; |
587 | const char *name; | |
1da177e4 | 588 | } phases[] = { |
c28bda25 RZ |
589 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
590 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
591 | {PHASE_UNKNOWN, "UNKNOWN"} | |
592 | }; | |
1da177e4 | 593 | |
c28bda25 | 594 | /* |
1da177e4 LT |
595 | * Function : void NCR5380_print_phase(struct Scsi_Host *instance) |
596 | * | |
597 | * Purpose : print the current SCSI phase for debugging purposes | |
598 | * | |
599 | * Input : instance - which NCR5380 | |
600 | */ | |
601 | ||
602 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
603 | { | |
c28bda25 RZ |
604 | unsigned char status; |
605 | int i; | |
606 | ||
607 | status = NCR5380_read(STATUS_REG); | |
608 | if (!(status & SR_REQ)) | |
609 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
610 | else { | |
611 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
612 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
613 | ; | |
614 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
615 | } | |
1da177e4 LT |
616 | } |
617 | ||
1da177e4 LT |
618 | #endif |
619 | ||
620 | /* | |
621 | * ++roman: New scheme of calling NCR5380_main() | |
c28bda25 | 622 | * |
1da177e4 LT |
623 | * If we're not in an interrupt, we can call our main directly, it cannot be |
624 | * already running. Else, we queue it on a task queue, if not 'main_running' | |
625 | * tells us that a lower level is already executing it. This way, | |
626 | * 'main_running' needs not be protected in a special way. | |
627 | * | |
628 | * queue_main() is a utility function for putting our main onto the task | |
629 | * queue, if main_running is false. It should be called only from a | |
630 | * interrupt or bottom half. | |
631 | */ | |
632 | ||
5a0e3ad6 | 633 | #include <linux/gfp.h> |
1da177e4 LT |
634 | #include <linux/workqueue.h> |
635 | #include <linux/interrupt.h> | |
636 | ||
c28bda25 | 637 | static volatile int main_running; |
b312b38c | 638 | static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); |
1da177e4 | 639 | |
c28bda25 | 640 | static inline void queue_main(void) |
1da177e4 | 641 | { |
c28bda25 RZ |
642 | if (!main_running) { |
643 | /* If in interrupt and NCR5380_main() not already running, | |
644 | queue it on the 'immediate' task queue, to be processed | |
645 | immediately after the current interrupt processing has | |
646 | finished. */ | |
647 | schedule_work(&NCR5380_tqueue); | |
648 | } | |
649 | /* else: nothing to do: the running NCR5380_main() will pick up | |
650 | any newly queued command. */ | |
1da177e4 LT |
651 | } |
652 | ||
653 | ||
c28bda25 | 654 | static inline void NCR5380_all_init(void) |
1da177e4 | 655 | { |
c28bda25 RZ |
656 | static int done = 0; |
657 | if (!done) { | |
d65e634a | 658 | dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n"); |
c28bda25 RZ |
659 | done = 1; |
660 | } | |
1da177e4 LT |
661 | } |
662 | ||
8c32513b FT |
663 | /** |
664 | * NCR58380_info - report driver and host information | |
665 | * @instance: relevant scsi host instance | |
1da177e4 | 666 | * |
8c32513b | 667 | * For use as the host template info() handler. |
1da177e4 | 668 | * |
8c32513b | 669 | * Locks: none |
1da177e4 LT |
670 | */ |
671 | ||
8c32513b | 672 | static const char *NCR5380_info(struct Scsi_Host *instance) |
1da177e4 | 673 | { |
8c32513b FT |
674 | struct NCR5380_hostdata *hostdata = shost_priv(instance); |
675 | ||
676 | return hostdata->info; | |
677 | } | |
678 | ||
679 | static void prepare_info(struct Scsi_Host *instance) | |
680 | { | |
681 | struct NCR5380_hostdata *hostdata = shost_priv(instance); | |
682 | ||
683 | snprintf(hostdata->info, sizeof(hostdata->info), | |
684 | "%s, io_port 0x%lx, n_io_port %d, " | |
685 | "base 0x%lx, irq %d, " | |
686 | "can_queue %d, cmd_per_lun %d, " | |
687 | "sg_tablesize %d, this_id %d, " | |
688 | "options { %s} ", | |
689 | instance->hostt->name, instance->io_port, instance->n_io_port, | |
690 | instance->base, instance->irq, | |
691 | instance->can_queue, instance->cmd_per_lun, | |
692 | instance->sg_tablesize, instance->this_id, | |
693 | #ifdef DIFFERENTIAL | |
694 | "DIFFERENTIAL " | |
695 | #endif | |
1da177e4 | 696 | #ifdef REAL_DMA |
8c32513b | 697 | "REAL_DMA " |
1da177e4 LT |
698 | #endif |
699 | #ifdef PARITY | |
8c32513b | 700 | "PARITY " |
1da177e4 LT |
701 | #endif |
702 | #ifdef SUPPORT_TAGS | |
8c32513b | 703 | "SUPPORT_TAGS " |
1da177e4 | 704 | #endif |
8c32513b | 705 | ""); |
1da177e4 LT |
706 | } |
707 | ||
708 | /* | |
709 | * Function : void NCR5380_print_status (struct Scsi_Host *instance) | |
710 | * | |
711 | * Purpose : print commands in the various queues, called from | |
712 | * NCR5380_abort and NCR5380_debug to aid debugging. | |
713 | * | |
c28bda25 | 714 | * Inputs : instance, pointer to this instance. |
1da177e4 LT |
715 | */ |
716 | ||
710ddd0d | 717 | static void lprint_Scsi_Cmnd(struct scsi_cmnd *cmd) |
1da177e4 | 718 | { |
d89537e1 AV |
719 | int i, s; |
720 | unsigned char *command; | |
9cb78c16 | 721 | printk("scsi%d: destination target %d, lun %llu\n", |
d89537e1 AV |
722 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
723 | printk(KERN_CONT " command = "); | |
724 | command = cmd->cmnd; | |
725 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
726 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
727 | printk(KERN_CONT " %02x", command[i]); | |
728 | printk("\n"); | |
1da177e4 LT |
729 | } |
730 | ||
d89537e1 | 731 | static void NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 732 | { |
c28bda25 | 733 | struct NCR5380_hostdata *hostdata; |
710ddd0d | 734 | struct scsi_cmnd *ptr; |
c28bda25 | 735 | unsigned long flags; |
d89537e1 | 736 | |
8ad3a593 FT |
737 | NCR5380_dprint(NDEBUG_ANY, instance); |
738 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
c28bda25 RZ |
739 | |
740 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
741 | ||
c28bda25 | 742 | local_irq_save(flags); |
d89537e1 | 743 | printk("NCR5380: coroutine is%s running.\n", |
c28bda25 | 744 | main_running ? "" : "n't"); |
c28bda25 | 745 | if (!hostdata->connected) |
d89537e1 | 746 | printk("scsi%d: no currently connected command\n", HOSTNO); |
c28bda25 | 747 | else |
710ddd0d | 748 | lprint_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected); |
d89537e1 | 749 | printk("scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 750 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 | 751 | lprint_Scsi_Cmnd(ptr); |
1da177e4 | 752 | |
d89537e1 | 753 | printk("scsi%d: disconnected_queue\n", HOSTNO); |
710ddd0d | 754 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
755 | ptr = NEXT(ptr)) |
756 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 757 | |
c28bda25 | 758 | local_irq_restore(flags); |
d89537e1 | 759 | printk("\n"); |
1da177e4 LT |
760 | } |
761 | ||
710ddd0d | 762 | static void show_Scsi_Cmnd(struct scsi_cmnd *cmd, struct seq_file *m) |
1da177e4 | 763 | { |
c28bda25 RZ |
764 | int i, s; |
765 | unsigned char *command; | |
9cb78c16 | 766 | seq_printf(m, "scsi%d: destination target %d, lun %llu\n", |
c28bda25 | 767 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
d89537e1 | 768 | seq_printf(m, " command = "); |
c28bda25 | 769 | command = cmd->cmnd; |
d89537e1 | 770 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); |
c28bda25 | 771 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
d89537e1 AV |
772 | seq_printf(m, " %02x", command[i]); |
773 | seq_printf(m, "\n"); | |
1da177e4 LT |
774 | } |
775 | ||
4d3d2a54 FT |
776 | static int __maybe_unused NCR5380_show_info(struct seq_file *m, |
777 | struct Scsi_Host *instance) | |
d89537e1 AV |
778 | { |
779 | struct NCR5380_hostdata *hostdata; | |
710ddd0d | 780 | struct scsi_cmnd *ptr; |
d89537e1 AV |
781 | unsigned long flags; |
782 | ||
783 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
784 | ||
d89537e1 AV |
785 | local_irq_save(flags); |
786 | seq_printf(m, "NCR5380: coroutine is%s running.\n", | |
787 | main_running ? "" : "n't"); | |
788 | if (!hostdata->connected) | |
789 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
790 | else | |
710ddd0d | 791 | show_Scsi_Cmnd((struct scsi_cmnd *) hostdata->connected, m); |
d89537e1 | 792 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); |
710ddd0d | 793 | for (ptr = (struct scsi_cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) |
d89537e1 AV |
794 | show_Scsi_Cmnd(ptr, m); |
795 | ||
796 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
710ddd0d | 797 | for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
798 | ptr = NEXT(ptr)) |
799 | show_Scsi_Cmnd(ptr, m); | |
800 | ||
801 | local_irq_restore(flags); | |
802 | return 0; | |
803 | } | |
1da177e4 | 804 | |
c28bda25 | 805 | /* |
1da177e4 LT |
806 | * Function : void NCR5380_init (struct Scsi_Host *instance) |
807 | * | |
808 | * Purpose : initializes *instance and corresponding 5380 chip. | |
809 | * | |
c28bda25 | 810 | * Inputs : instance - instantiation of the 5380 driver. |
1da177e4 LT |
811 | * |
812 | * Notes : I assume that the host, hostno, and id bits have been | |
c28bda25 RZ |
813 | * set correctly. I don't care about the irq and other fields. |
814 | * | |
1da177e4 LT |
815 | */ |
816 | ||
95fde7a8 | 817 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 818 | { |
c28bda25 RZ |
819 | int i; |
820 | SETUP_HOSTDATA(instance); | |
821 | ||
822 | NCR5380_all_init(); | |
823 | ||
824 | hostdata->aborted = 0; | |
825 | hostdata->id_mask = 1 << instance->this_id; | |
826 | hostdata->id_higher_mask = 0; | |
827 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
828 | if (i > hostdata->id_mask) | |
829 | hostdata->id_higher_mask |= i; | |
830 | for (i = 0; i < 8; ++i) | |
831 | hostdata->busy[i] = 0; | |
1da177e4 | 832 | #ifdef SUPPORT_TAGS |
c28bda25 | 833 | init_tags(); |
1da177e4 LT |
834 | #endif |
835 | #if defined (REAL_DMA) | |
c28bda25 | 836 | hostdata->dma_len = 0; |
1da177e4 | 837 | #endif |
c28bda25 RZ |
838 | hostdata->targets_present = 0; |
839 | hostdata->connected = NULL; | |
840 | hostdata->issue_queue = NULL; | |
841 | hostdata->disconnected_queue = NULL; | |
842 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; | |
843 | ||
844 | if (!the_template) { | |
845 | the_template = instance->hostt; | |
846 | first_instance = instance; | |
847 | } | |
1da177e4 | 848 | |
8c32513b FT |
849 | prepare_info(instance); |
850 | ||
c28bda25 RZ |
851 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
852 | NCR5380_write(MODE_REG, MR_BASE); | |
853 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
854 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 855 | |
c28bda25 | 856 | return 0; |
1da177e4 LT |
857 | } |
858 | ||
6323e4fe GU |
859 | static void NCR5380_exit(struct Scsi_Host *instance) |
860 | { | |
861 | /* Empty, as we didn't schedule any delayed work */ | |
862 | } | |
863 | ||
c28bda25 | 864 | /* |
710ddd0d FT |
865 | * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd, |
866 | * void (*done)(struct scsi_cmnd *)) | |
1da177e4 LT |
867 | * |
868 | * Purpose : enqueues a SCSI command | |
869 | * | |
870 | * Inputs : cmd - SCSI command, done - function called on completion, with | |
871 | * a pointer to the command descriptor. | |
c28bda25 | 872 | * |
1da177e4 LT |
873 | * Returns : 0 |
874 | * | |
c28bda25 RZ |
875 | * Side effects : |
876 | * cmd is added to the per instance issue_queue, with minor | |
877 | * twiddling done to the host specific fields of cmd. If the | |
1da177e4 LT |
878 | * main coroutine is not running, it is restarted. |
879 | * | |
880 | */ | |
881 | ||
710ddd0d FT |
882 | static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd, |
883 | void (*done)(struct scsi_cmnd *)) | |
1da177e4 | 884 | { |
c28bda25 | 885 | SETUP_HOSTDATA(cmd->device->host); |
710ddd0d | 886 | struct scsi_cmnd *tmp; |
c28bda25 | 887 | unsigned long flags; |
1da177e4 LT |
888 | |
889 | #if (NDEBUG & NDEBUG_NO_WRITE) | |
c28bda25 RZ |
890 | switch (cmd->cmnd[0]) { |
891 | case WRITE_6: | |
892 | case WRITE_10: | |
893 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", | |
894 | H_NO(cmd)); | |
895 | cmd->result = (DID_ERROR << 16); | |
896 | done(cmd); | |
897 | return 0; | |
898 | } | |
1da177e4 LT |
899 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
900 | ||
c28bda25 RZ |
901 | /* |
902 | * We use the host_scribble field as a pointer to the next command | |
903 | * in a queue | |
904 | */ | |
905 | ||
3130d905 | 906 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
907 | cmd->scsi_done = done; |
908 | ||
909 | cmd->result = 0; | |
910 | ||
911 | /* | |
912 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
913 | * commands are added to the head of the queue since any command will | |
914 | * clear the contingent allegiance condition that exists and the | |
915 | * sense data is only guaranteed to be valid while the condition exists. | |
916 | */ | |
917 | ||
918 | local_irq_save(flags); | |
919 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. | |
920 | * Otherwise a running NCR5380_main may steal the lock. | |
921 | * Lock before actually inserting due to fairness reasons explained in | |
922 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
923 | * to release the lock. | |
924 | * Stop timer for this command while waiting for the lock, or timeouts | |
925 | * may happen (and they really do), and it's no good if the command doesn't | |
926 | * appear in any of the queues. | |
927 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
928 | * because also a timer int can trigger an abort or reset, which would | |
929 | * alter queues and touch the lock. | |
930 | */ | |
931 | if (!IS_A_TT()) { | |
8ce7955a | 932 | /* perhaps stop command timer here */ |
c28bda25 | 933 | falcon_get_lock(); |
8ce7955a | 934 | /* perhaps restart command timer here */ |
c28bda25 RZ |
935 | } |
936 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
937 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 938 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
939 | hostdata->issue_queue = cmd; |
940 | } else { | |
710ddd0d | 941 | for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; |
c28bda25 RZ |
942 | NEXT(tmp); tmp = NEXT(tmp)) |
943 | ; | |
944 | LIST(cmd, tmp); | |
3130d905 | 945 | SET_NEXT(tmp, cmd); |
c28bda25 RZ |
946 | } |
947 | local_irq_restore(flags); | |
948 | ||
d65e634a | 949 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
c28bda25 RZ |
950 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
951 | ||
952 | /* If queue_command() is called from an interrupt (real one or bottom | |
953 | * half), we let queue_main() do the job of taking care about main. If it | |
954 | * is already running, this is a no-op, else main will be queued. | |
955 | * | |
956 | * If we're not in an interrupt, we can call NCR5380_main() | |
957 | * unconditionally, because it cannot be already running. | |
958 | */ | |
959 | if (in_interrupt() || ((flags >> 8) & 7) >= 6) | |
960 | queue_main(); | |
961 | else | |
962 | NCR5380_main(NULL); | |
963 | return 0; | |
1da177e4 LT |
964 | } |
965 | ||
f281233d JG |
966 | static DEF_SCSI_QCMD(NCR5380_queue_command) |
967 | ||
1da177e4 | 968 | /* |
c28bda25 | 969 | * Function : NCR5380_main (void) |
1da177e4 | 970 | * |
c28bda25 RZ |
971 | * Purpose : NCR5380_main is a coroutine that runs as long as more work can |
972 | * be done on the NCR5380 host adapters in a system. Both | |
973 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
1da177e4 | 974 | * in case it is not running. |
c28bda25 RZ |
975 | * |
976 | * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should | |
1da177e4 | 977 | * reenable them. This prevents reentrancy and kernel stack overflow. |
c28bda25 RZ |
978 | */ |
979 | ||
b312b38c | 980 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 981 | { |
710ddd0d | 982 | struct scsi_cmnd *tmp, *prev; |
c28bda25 RZ |
983 | struct Scsi_Host *instance = first_instance; |
984 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); | |
985 | int done; | |
986 | unsigned long flags; | |
987 | ||
988 | /* | |
989 | * We run (with interrupts disabled) until we're sure that none of | |
990 | * the host adapters have anything that can be done, at which point | |
991 | * we set main_running to 0 and exit. | |
992 | * | |
993 | * Interrupts are enabled before doing various other internal | |
994 | * instructions, after we've decided that we need to run through | |
995 | * the loop again. | |
996 | * | |
997 | * this should prevent any race conditions. | |
998 | * | |
999 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
1000 | * because also a timer int can trigger an abort or reset, which can | |
1001 | * alter queues and touch the Falcon lock. | |
1002 | */ | |
1003 | ||
1004 | /* Tell int handlers main() is now already executing. Note that | |
1005 | no races are possible here. If an int comes in before | |
1006 | 'main_running' is set here, and queues/executes main via the | |
1007 | task queue, it doesn't do any harm, just this instance of main | |
1008 | won't find any work left to do. */ | |
1009 | if (main_running) | |
1010 | return; | |
1011 | main_running = 1; | |
1012 | ||
1013 | local_save_flags(flags); | |
1014 | do { | |
1015 | local_irq_disable(); /* Freeze request queues */ | |
1016 | done = 1; | |
1017 | ||
1018 | if (!hostdata->connected) { | |
d65e634a | 1019 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
1020 | /* |
1021 | * Search through the issue_queue for a command destined | |
1022 | * for a target that's not busy. | |
1023 | */ | |
1da177e4 | 1024 | #if (NDEBUG & NDEBUG_LISTS) |
710ddd0d | 1025 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; |
c28bda25 RZ |
1026 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
1027 | ; | |
1028 | /*printk("%p ", tmp);*/ | |
1029 | if ((tmp == prev) && tmp) | |
1030 | printk(" LOOP\n"); | |
1031 | /* else printk("\n"); */ | |
1da177e4 | 1032 | #endif |
710ddd0d | 1033 | for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, |
c28bda25 | 1034 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { |
9cb78c16 | 1035 | u8 lun = tmp->device->lun; |
1da177e4 LT |
1036 | |
1037 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 | 1038 | if (prev != tmp) |
9cb78c16 | 1039 | printk("MAIN tmp=%p target=%d busy=%d lun=%llu\n", |
c28bda25 | 1040 | tmp, tmp->device->id, hostdata->busy[tmp->device->id], |
9cb78c16 | 1041 | lun); |
1da177e4 | 1042 | #endif |
c28bda25 RZ |
1043 | /* When we find one, remove it from the issue queue. */ |
1044 | /* ++guenther: possible race with Falcon locking */ | |
1045 | if ( | |
1da177e4 | 1046 | #ifdef SUPPORT_TAGS |
c28bda25 | 1047 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 1048 | #else |
9cb78c16 | 1049 | !(hostdata->busy[tmp->device->id] & (1 << lun)) |
1da177e4 | 1050 | #endif |
c28bda25 RZ |
1051 | ) { |
1052 | /* ++guenther: just to be sure, this must be atomic */ | |
1053 | local_irq_disable(); | |
1054 | if (prev) { | |
1055 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 1056 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
1057 | } else { |
1058 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1059 | hostdata->issue_queue = NEXT(tmp); | |
1060 | } | |
3130d905 | 1061 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
1062 | falcon_dont_release++; |
1063 | ||
1064 | /* reenable interrupts after finding one */ | |
1065 | local_irq_restore(flags); | |
1066 | ||
1067 | /* | |
1068 | * Attempt to establish an I_T_L nexus here. | |
1069 | * On success, instance->hostdata->connected is set. | |
1070 | * On failure, we must add the command back to the | |
1071 | * issue queue so we can keep trying. | |
1072 | */ | |
d65e634a | 1073 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 | 1074 | "lun %d removed from issue_queue\n", |
9cb78c16 | 1075 | HOSTNO, tmp->device->id, lun); |
c28bda25 RZ |
1076 | /* |
1077 | * REQUEST SENSE commands are issued without tagged | |
1078 | * queueing, even on SCSI-II devices because the | |
1079 | * contingent allegiance condition exists for the | |
1080 | * entire unit. | |
1081 | */ | |
1082 | /* ++roman: ...and the standard also requires that | |
1083 | * REQUEST SENSE command are untagged. | |
1084 | */ | |
1085 | ||
1da177e4 | 1086 | #ifdef SUPPORT_TAGS |
c28bda25 | 1087 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1088 | #endif |
76f13b93 | 1089 | if (!NCR5380_select(instance, tmp)) { |
c28bda25 RZ |
1090 | falcon_dont_release--; |
1091 | /* release if target did not response! */ | |
1092 | falcon_release_lock_if_possible(hostdata); | |
1093 | break; | |
1094 | } else { | |
1095 | local_irq_disable(); | |
1096 | LIST(tmp, hostdata->issue_queue); | |
3130d905 | 1097 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 1098 | hostdata->issue_queue = tmp; |
1da177e4 | 1099 | #ifdef SUPPORT_TAGS |
c28bda25 | 1100 | cmd_free_tag(tmp); |
1da177e4 | 1101 | #endif |
c28bda25 RZ |
1102 | falcon_dont_release--; |
1103 | local_irq_restore(flags); | |
d65e634a | 1104 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 RZ |
1105 | "returned to issue_queue\n", HOSTNO); |
1106 | if (hostdata->connected) | |
1107 | break; | |
1108 | } | |
1109 | } /* if target/lun/target queue is not busy */ | |
1110 | } /* for issue_queue */ | |
1111 | } /* if (!hostdata->connected) */ | |
1112 | ||
1113 | if (hostdata->connected | |
1da177e4 | 1114 | #ifdef REAL_DMA |
c28bda25 | 1115 | && !hostdata->dma_len |
1da177e4 | 1116 | #endif |
c28bda25 RZ |
1117 | ) { |
1118 | local_irq_restore(flags); | |
d65e634a | 1119 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1120 | HOSTNO); |
1121 | NCR5380_information_transfer(instance); | |
d65e634a | 1122 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1123 | done = 0; |
1124 | } | |
1125 | } while (!done); | |
1da177e4 | 1126 | |
c28bda25 RZ |
1127 | /* Better allow ints _after_ 'main_running' has been cleared, else |
1128 | an interrupt could believe we'll pick up the work it left for | |
1129 | us, but we won't see it anymore here... */ | |
1130 | main_running = 0; | |
1131 | local_irq_restore(flags); | |
1da177e4 LT |
1132 | } |
1133 | ||
1134 | ||
1135 | #ifdef REAL_DMA | |
1136 | /* | |
1137 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1138 | * | |
1139 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1140 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1141 | * |
1142 | * Inputs : instance - this instance of the NCR5380. | |
1143 | * | |
1144 | */ | |
1145 | ||
c28bda25 | 1146 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1147 | { |
c28bda25 RZ |
1148 | SETUP_HOSTDATA(instance); |
1149 | int transfered, saved_data = 0, overrun = 0, cnt, toPIO; | |
1150 | unsigned char **data, p; | |
1151 | volatile int *count; | |
1152 | ||
1153 | if (!hostdata->connected) { | |
1154 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | |
1155 | "no connected cmd\n", HOSTNO); | |
1156 | return; | |
1da177e4 | 1157 | } |
c28bda25 RZ |
1158 | |
1159 | if (atari_read_overruns) { | |
1160 | p = hostdata->connected->SCp.phase; | |
1161 | if (p & SR_IO) { | |
1162 | udelay(10); | |
1163 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1164 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1165 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1166 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1167 | overrun = 1; | |
d65e634a | 1168 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1169 | } |
1170 | } | |
1171 | } | |
1172 | ||
d65e634a | 1173 | dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
c28bda25 RZ |
1174 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
1175 | NCR5380_read(STATUS_REG)); | |
1176 | ||
1177 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1178 | NCR5380_write(MODE_REG, MR_BASE); | |
1179 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1180 | ||
1181 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); | |
1182 | hostdata->dma_len = 0; | |
1183 | ||
1184 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1185 | count = &hostdata->connected->SCp.this_residual; | |
1186 | *data += transfered; | |
1187 | *count -= transfered; | |
1188 | ||
1189 | if (atari_read_overruns) { | |
1190 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { | |
1191 | cnt = toPIO = atari_read_overruns; | |
1192 | if (overrun) { | |
d65e634a | 1193 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1194 | *(*data)++ = saved_data; |
1195 | (*count)--; | |
1196 | cnt--; | |
1197 | toPIO--; | |
1198 | } | |
d65e634a | 1199 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1200 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1201 | *count -= toPIO - cnt; | |
1202 | } | |
1da177e4 | 1203 | } |
1da177e4 LT |
1204 | } |
1205 | #endif /* REAL_DMA */ | |
1206 | ||
1207 | ||
1208 | /* | |
1209 | * Function : void NCR5380_intr (int irq) | |
c28bda25 | 1210 | * |
1da177e4 | 1211 | * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
c28bda25 | 1212 | * from the disconnected queue, and restarting NCR5380_main() |
1da177e4 LT |
1213 | * as required. |
1214 | * | |
1215 | * Inputs : int irq, irq that caused this interrupt. | |
1216 | * | |
1217 | */ | |
1218 | ||
c28bda25 | 1219 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1220 | { |
c28bda25 RZ |
1221 | struct Scsi_Host *instance = first_instance; |
1222 | int done = 1, handled = 0; | |
1223 | unsigned char basr; | |
1224 | ||
d65e634a | 1225 | dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO); |
c28bda25 RZ |
1226 | |
1227 | /* Look for pending interrupts */ | |
1228 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
d65e634a | 1229 | dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr); |
c28bda25 RZ |
1230 | /* dispatch to appropriate routine if found and done=0 */ |
1231 | if (basr & BASR_IRQ) { | |
8ad3a593 | 1232 | NCR5380_dprint(NDEBUG_INTR, instance); |
c28bda25 RZ |
1233 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
1234 | done = 0; | |
1235 | ENABLE_IRQ(); | |
d65e634a | 1236 | dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO); |
c28bda25 RZ |
1237 | NCR5380_reselect(instance); |
1238 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1239 | } else if (basr & BASR_PARITY_ERROR) { | |
d65e634a | 1240 | dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO); |
c28bda25 RZ |
1241 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1242 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
d65e634a | 1243 | dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO); |
c28bda25 RZ |
1244 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1245 | } else { | |
1246 | /* | |
1247 | * The rest of the interrupt conditions can occur only during a | |
1248 | * DMA transfer | |
1249 | */ | |
1da177e4 LT |
1250 | |
1251 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1252 | /* |
1253 | * We should only get PHASE MISMATCH and EOP interrupts if we have | |
1254 | * DMA enabled, so do a sanity check based on the current setting | |
1255 | * of the MODE register. | |
1256 | */ | |
1257 | ||
1258 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | |
1259 | ((basr & BASR_END_DMA_TRANSFER) || | |
1260 | !(basr & BASR_PHASE_MATCH))) { | |
1261 | ||
d65e634a | 1262 | dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
c28bda25 RZ |
1263 | NCR5380_dma_complete( instance ); |
1264 | done = 0; | |
1265 | ENABLE_IRQ(); | |
1266 | } else | |
1da177e4 | 1267 | #endif /* REAL_DMA */ |
c28bda25 | 1268 | { |
1da177e4 | 1269 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
c28bda25 RZ |
1270 | if (basr & BASR_PHASE_MATCH) |
1271 | printk(KERN_NOTICE "scsi%d: unknown interrupt, " | |
1272 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", | |
1273 | HOSTNO, basr, NCR5380_read(MODE_REG), | |
1274 | NCR5380_read(STATUS_REG)); | |
1275 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1276 | } | |
1277 | } /* if !(SELECTION || PARITY) */ | |
1278 | handled = 1; | |
1279 | } /* BASR & IRQ */ else { | |
1280 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | |
1281 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | |
1282 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | |
1283 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1284 | } | |
1285 | ||
1286 | if (!done) { | |
d65e634a | 1287 | dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO); |
c28bda25 RZ |
1288 | /* Put a call to NCR5380_main() on the queue... */ |
1289 | queue_main(); | |
1290 | } | |
1291 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
1292 | } |
1293 | ||
c28bda25 | 1294 | /* |
710ddd0d FT |
1295 | * Function : int NCR5380_select(struct Scsi_Host *instance, |
1296 | * struct scsi_cmnd *cmd) | |
1da177e4 LT |
1297 | * |
1298 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1299 | * including ARBITRATION, SELECTION, and initial message out for |
1300 | * IDENTIFY and queue messages. | |
1da177e4 | 1301 | * |
c28bda25 | 1302 | * Inputs : instance - instantiation of the 5380 driver on which this |
76f13b93 | 1303 | * target lives, cmd - SCSI command to execute. |
c28bda25 | 1304 | * |
1da177e4 | 1305 | * Returns : -1 if selection could not execute for some reason, |
c28bda25 RZ |
1306 | * 0 if selection succeeded or failed because the target |
1307 | * did not respond. | |
1da177e4 | 1308 | * |
c28bda25 RZ |
1309 | * Side effects : |
1310 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1311 | * with registers as they should have been on entry - ie |
1312 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1313 | * will cease to drive any SCSI bus signals. | |
1314 | * | |
c28bda25 RZ |
1315 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1316 | * instance->connected will be set to cmd. | |
1317 | * SELECT interrupt will be disabled. | |
1da177e4 | 1318 | * |
c28bda25 | 1319 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1320 | * cmd->result host byte set to DID_BAD_TARGET. |
1321 | */ | |
1322 | ||
710ddd0d | 1323 | static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
1da177e4 | 1324 | { |
c28bda25 RZ |
1325 | SETUP_HOSTDATA(instance); |
1326 | unsigned char tmp[3], phase; | |
1327 | unsigned char *data; | |
1328 | int len; | |
1329 | unsigned long timeout; | |
1330 | unsigned long flags; | |
1331 | ||
1332 | hostdata->restart_select = 0; | |
8ad3a593 | 1333 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1334 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1335 | instance->this_id); |
1336 | ||
1337 | /* | |
1338 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1339 | * data bus during SELECTION. | |
1340 | */ | |
1341 | ||
1342 | local_irq_save(flags); | |
1343 | if (hostdata->connected) { | |
1344 | local_irq_restore(flags); | |
1345 | return -1; | |
1346 | } | |
1347 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1348 | |
c28bda25 RZ |
1349 | /* |
1350 | * Start arbitration. | |
1351 | */ | |
1da177e4 | 1352 | |
c28bda25 RZ |
1353 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1354 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1355 | |
c28bda25 | 1356 | local_irq_restore(flags); |
1da177e4 | 1357 | |
c28bda25 | 1358 | /* Wait for arbitration logic to complete */ |
fb810d12 | 1359 | #if defined(NCR_TIMEOUT) |
c28bda25 RZ |
1360 | { |
1361 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; | |
1362 | ||
1363 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && | |
1364 | time_before(jiffies, timeout) && !hostdata->connected) | |
1365 | ; | |
1366 | if (time_after_eq(jiffies, timeout)) { | |
1367 | printk("scsi : arbitration timeout at %d\n", __LINE__); | |
1368 | NCR5380_write(MODE_REG, MR_BASE); | |
1369 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1370 | return -1; | |
1371 | } | |
1372 | } | |
1da177e4 | 1373 | #else /* NCR_TIMEOUT */ |
c28bda25 RZ |
1374 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && |
1375 | !hostdata->connected) | |
1376 | ; | |
1da177e4 LT |
1377 | #endif |
1378 | ||
d65e634a | 1379 | dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO); |
c28bda25 RZ |
1380 | |
1381 | if (hostdata->connected) { | |
1382 | NCR5380_write(MODE_REG, MR_BASE); | |
1383 | return -1; | |
1384 | } | |
1385 | /* | |
1386 | * The arbitration delay is 2.2us, but this is a minimum and there is | |
1387 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | |
1388 | * the integral nature of udelay(). | |
1389 | * | |
1390 | */ | |
1391 | ||
1392 | udelay(3); | |
1393 | ||
1394 | /* Check for lost arbitration */ | |
1395 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1396 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1397 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1398 | hostdata->connected) { | |
1399 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1400 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 RZ |
1401 | HOSTNO); |
1402 | return -1; | |
1403 | } | |
1da177e4 | 1404 | |
c28bda25 RZ |
1405 | /* after/during arbitration, BSY should be asserted. |
1406 | IBM DPES-31080 Version S31Q works now */ | |
1407 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ | |
1408 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1409 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1410 | ||
1411 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1412 | hostdata->connected) { | |
1413 | NCR5380_write(MODE_REG, MR_BASE); | |
1414 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
d65e634a | 1415 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
c28bda25 RZ |
1416 | HOSTNO); |
1417 | return -1; | |
1418 | } | |
1419 | ||
1420 | /* | |
1421 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1422 | * a minimum so we'll udelay ceil(1.2) | |
1423 | */ | |
1da177e4 LT |
1424 | |
1425 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY | |
c28bda25 RZ |
1426 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ |
1427 | udelay(15); | |
1da177e4 | 1428 | #else |
c28bda25 | 1429 | udelay(2); |
1da177e4 | 1430 | #endif |
c28bda25 RZ |
1431 | |
1432 | if (hostdata->connected) { | |
1433 | NCR5380_write(MODE_REG, MR_BASE); | |
1434 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1435 | return -1; | |
1436 | } | |
1437 | ||
d65e634a | 1438 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1439 | |
1440 | /* | |
1441 | * Now that we have won arbitration, start Selection process, asserting | |
1442 | * the host and target ID's on the SCSI bus. | |
1443 | */ | |
1444 | ||
1445 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1446 | ||
1447 | /* | |
1448 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1449 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1450 | * phase immediately after selection. | |
1451 | */ | |
1452 | ||
1453 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1454 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1455 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1456 | |
c28bda25 RZ |
1457 | /* |
1458 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1459 | * otherwise we will trigger an interrupt. | |
1460 | */ | |
1461 | ||
1462 | if (hostdata->connected) { | |
1463 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1464 | return -1; | |
1465 | } | |
1466 | ||
1467 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 1468 | |
c28bda25 RZ |
1469 | /* |
1470 | * The initiator shall then wait at least two deskew delays and release | |
1471 | * the BSY signal. | |
1472 | */ | |
1473 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1474 | ||
1475 | /* Reset BSY */ | |
1476 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1477 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1478 | ||
1479 | /* | |
1480 | * Something weird happens when we cease to drive BSY - looks | |
1481 | * like the board/chip is letting us do another read before the | |
1482 | * appropriate propagation delay has expired, and we're confusing | |
1483 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1484 | * | |
1485 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1486 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1487 | * tighter 'C' code breaks and requires this) solves the problem - | |
1488 | * the 1 us delay is arbitrary, and only used because this delay will | |
1489 | * be the same on other platforms and since it works here, it should | |
1490 | * work there. | |
1491 | * | |
1492 | * wingel suggests that this could be due to failing to wait | |
1493 | * one deskew delay. | |
1494 | */ | |
1da177e4 | 1495 | |
c28bda25 | 1496 | udelay(1); |
1da177e4 | 1497 | |
d65e634a | 1498 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1499 | |
c28bda25 RZ |
1500 | /* |
1501 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1502 | * selection. | |
1503 | */ | |
1da177e4 | 1504 | |
c28bda25 | 1505 | timeout = jiffies + 25; |
1da177e4 | 1506 | |
c28bda25 RZ |
1507 | /* |
1508 | * XXX very interesting - we're seeing a bounce where the BSY we | |
1509 | * asserted is being reflected / still asserted (propagation delay?) | |
1510 | * and it's detecting as true. Sigh. | |
1511 | */ | |
1da177e4 LT |
1512 | |
1513 | #if 0 | |
c28bda25 RZ |
1514 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert |
1515 | * IO while SEL is true. But again, there are some disks out the in the | |
1516 | * world that do that nevertheless. (Somebody claimed that this announces | |
1517 | * reselection capability of the target.) So we better skip that test and | |
1518 | * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) | |
1519 | */ | |
1520 | ||
1521 | while (time_before(jiffies, timeout) && | |
1522 | !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO))) | |
1523 | ; | |
1524 | ||
1525 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1526 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1527 | NCR5380_reselect(instance); | |
1528 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", | |
1529 | HOSTNO); | |
1530 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1531 | return -1; | |
1532 | } | |
1da177e4 | 1533 | #else |
c28bda25 RZ |
1534 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)) |
1535 | ; | |
1da177e4 LT |
1536 | #endif |
1537 | ||
c28bda25 RZ |
1538 | /* |
1539 | * No less than two deskew delays after the initiator detects the | |
1540 | * BSY signal is true, it shall release the SEL signal and may | |
1541 | * change the DATA BUS. -wingel | |
1542 | */ | |
1da177e4 | 1543 | |
c28bda25 | 1544 | udelay(1); |
1da177e4 | 1545 | |
c28bda25 | 1546 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1da177e4 | 1547 | |
c28bda25 RZ |
1548 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
1549 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1550 | if (hostdata->targets_present & (1 << cmd->device->id)) { | |
1551 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); | |
1552 | if (hostdata->restart_select) | |
1553 | printk(KERN_NOTICE "\trestart select\n"); | |
8ad3a593 | 1554 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
1555 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1556 | return -1; | |
1557 | } | |
1558 | cmd->result = DID_BAD_TARGET << 16; | |
1da177e4 | 1559 | #ifdef SUPPORT_TAGS |
c28bda25 | 1560 | cmd_free_tag(cmd); |
1da177e4 | 1561 | #endif |
c28bda25 RZ |
1562 | cmd->scsi_done(cmd); |
1563 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1564 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1565 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | hostdata->targets_present |= (1 << cmd->device->id); | |
1570 | ||
1571 | /* | |
1572 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1573 | * was true but before BSY was false during selection, the information | |
1574 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1575 | * IDENTIFY message. | |
1576 | * | |
1577 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1578 | * message (2 bytes) with a tag ID that we increment with every command | |
1579 | * until it wraps back to 0. | |
1580 | * | |
1581 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1582 | * which claim to support tagged queuing but fail when more than | |
1583 | * some number of commands are issued at once. | |
1584 | */ | |
1585 | ||
1586 | /* Wait for start of REQ/ACK handshake */ | |
1587 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
1588 | ; | |
1589 | ||
d65e634a | 1590 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1591 | HOSTNO, cmd->device->id); |
1592 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1593 | |
1594 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1595 | if (cmd->tag != TAG_NONE) { |
1596 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1597 | tmp[2] = cmd->tag; | |
1598 | len = 3; | |
1599 | } else | |
1600 | len = 1; | |
1da177e4 | 1601 | #else |
c28bda25 RZ |
1602 | len = 1; |
1603 | cmd->tag = 0; | |
1da177e4 LT |
1604 | #endif /* SUPPORT_TAGS */ |
1605 | ||
c28bda25 RZ |
1606 | /* Send message(s) */ |
1607 | data = tmp; | |
1608 | phase = PHASE_MSGOUT; | |
1609 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1610 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 RZ |
1611 | /* XXX need to handle errors here */ |
1612 | hostdata->connected = cmd; | |
1da177e4 | 1613 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1614 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1615 | #endif | |
1da177e4 | 1616 | |
c28bda25 | 1617 | initialize_SCp(cmd); |
1da177e4 | 1618 | |
c28bda25 | 1619 | return 0; |
1da177e4 LT |
1620 | } |
1621 | ||
c28bda25 RZ |
1622 | /* |
1623 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1624 | * unsigned char *phase, int *count, unsigned char **data) |
1625 | * | |
1626 | * Purpose : transfers data in given phase using polled I/O | |
1627 | * | |
c28bda25 RZ |
1628 | * Inputs : instance - instance of driver, *phase - pointer to |
1629 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1630 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1631 | * |
1da177e4 | 1632 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1633 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1634 | * is in same phase. |
1635 | * | |
c28bda25 | 1636 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1637 | * |
1638 | * XXX Note : handling for bus free may be useful. | |
1639 | */ | |
1640 | ||
1641 | /* | |
c28bda25 | 1642 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1643 | * IS 100% reliable, and for the actual data transfer where speed |
1644 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1645 | */ | |
1646 | ||
c28bda25 RZ |
1647 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1648 | unsigned char *phase, int *count, | |
1649 | unsigned char **data) | |
1da177e4 | 1650 | { |
c28bda25 RZ |
1651 | register unsigned char p = *phase, tmp; |
1652 | register int c = *count; | |
1653 | register unsigned char *d = *data; | |
1654 | ||
1655 | /* | |
1656 | * The NCR5380 chip will only drive the SCSI bus when the | |
1657 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1658 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1659 | */ |
1da177e4 | 1660 | |
c28bda25 | 1661 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1662 | |
c28bda25 RZ |
1663 | do { |
1664 | /* | |
1665 | * Wait for assertion of REQ, after which the phase bits will be | |
1666 | * valid | |
1667 | */ | |
1668 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) | |
1669 | ; | |
1da177e4 | 1670 | |
d65e634a | 1671 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1672 | |
c28bda25 RZ |
1673 | /* Check for phase mismatch */ |
1674 | if ((tmp & PHASE_MASK) != p) { | |
d65e634a | 1675 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1676 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1677 | break; |
1678 | } | |
1da177e4 | 1679 | |
c28bda25 RZ |
1680 | /* Do actual transfer from SCSI bus to / from memory */ |
1681 | if (!(p & SR_IO)) | |
1682 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1683 | else | |
1684 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1685 | |
c28bda25 | 1686 | ++d; |
1da177e4 | 1687 | |
c28bda25 RZ |
1688 | /* |
1689 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1690 | * should drop ATN on the last byte of the message phase | |
1691 | * after REQ has been asserted for the handshake but before | |
1692 | * the initiator raises ACK. | |
1693 | */ | |
1da177e4 | 1694 | |
c28bda25 RZ |
1695 | if (!(p & SR_IO)) { |
1696 | if (!((p & SR_MSG) && c > 1)) { | |
1697 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1698 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1699 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1700 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1701 | } else { | |
1702 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1703 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1704 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1705 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1706 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1707 | } | |
1708 | } else { | |
8ad3a593 | 1709 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1710 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1711 | } | |
1da177e4 | 1712 | |
c28bda25 RZ |
1713 | while (NCR5380_read(STATUS_REG) & SR_REQ) |
1714 | ; | |
1715 | ||
d65e634a | 1716 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1717 | |
1718 | /* | |
1719 | * We have several special cases to consider during REQ/ACK handshaking : | |
1720 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1721 | * message. ATN must be dropped as ACK is dropped. | |
1722 | * | |
1723 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1724 | * message. We must exit with ACK asserted, so that the calling | |
1725 | * code may raise ATN before dropping ACK to reject the message. | |
1726 | * | |
1727 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1728 | */ | |
1729 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1730 | if (p == PHASE_MSGOUT && c > 1) | |
1731 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1732 | else | |
1733 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1734 | } | |
1735 | } while (--c); | |
1736 | ||
d65e634a | 1737 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1738 | |
1739 | *count = c; | |
1740 | *data = d; | |
1741 | tmp = NCR5380_read(STATUS_REG); | |
1742 | /* The phase read from the bus is valid if either REQ is (already) | |
1743 | * asserted or if ACK hasn't been released yet. The latter is the case if | |
1744 | * we're in MSGIN and all wanted bytes have been received. | |
1745 | */ | |
1746 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) | |
1747 | *phase = tmp & PHASE_MASK; | |
1748 | else | |
1749 | *phase = PHASE_UNKNOWN; | |
1750 | ||
1751 | if (!c || (*phase == p)) | |
1752 | return 0; | |
1753 | else | |
1754 | return -1; | |
1da177e4 LT |
1755 | } |
1756 | ||
1757 | /* | |
1758 | * Function : do_abort (Scsi_Host *host) | |
c28bda25 RZ |
1759 | * |
1760 | * Purpose : abort the currently established nexus. Should only be | |
1761 | * called from a routine which can drop into a | |
1762 | * | |
1da177e4 LT |
1763 | * Returns : 0 on success, -1 on failure. |
1764 | */ | |
1765 | ||
c28bda25 | 1766 | static int do_abort(struct Scsi_Host *host) |
1da177e4 | 1767 | { |
c28bda25 RZ |
1768 | unsigned char tmp, *msgptr, phase; |
1769 | int len; | |
1770 | ||
1771 | /* Request message out phase */ | |
1da177e4 | 1772 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1773 | |
1774 | /* | |
1775 | * Wait for the target to indicate a valid phase by asserting | |
1776 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1777 | * and can immediately send the ABORT message, or we'll have some | |
1778 | * other phase and will have to source/sink data. | |
1779 | * | |
1780 | * We really don't care what value was on the bus or what value | |
1781 | * the target sees, so we just handshake. | |
1782 | */ | |
1783 | ||
3be38e7a | 1784 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) |
c28bda25 RZ |
1785 | ; |
1786 | ||
1787 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1788 | ||
1789 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1790 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1791 | ICR_ASSERT_ACK); | |
1792 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1793 | ; | |
1794 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1795 | } | |
1796 | ||
1797 | tmp = ABORT; | |
1798 | msgptr = &tmp; | |
1799 | len = 1; | |
1800 | phase = PHASE_MSGOUT; | |
1801 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); | |
1802 | ||
1803 | /* | |
1804 | * If we got here, and the command completed successfully, | |
1805 | * we're about to go into bus free state. | |
1806 | */ | |
1807 | ||
1808 | return len ? -1 : 0; | |
1da177e4 LT |
1809 | } |
1810 | ||
1811 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1812 | /* |
1813 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1814 | * unsigned char *phase, int *count, unsigned char **data) |
1815 | * | |
1816 | * Purpose : transfers data in given phase using either real | |
1817 | * or pseudo DMA. | |
1818 | * | |
c28bda25 RZ |
1819 | * Inputs : instance - instance of driver, *phase - pointer to |
1820 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1821 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1822 | * |
1da177e4 | 1823 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1824 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1825 | * is in same phase. |
1826 | * | |
c28bda25 | 1827 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1828 | * |
1829 | */ | |
1830 | ||
1831 | ||
c28bda25 RZ |
1832 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1833 | unsigned char *phase, int *count, | |
1834 | unsigned char **data) | |
1da177e4 | 1835 | { |
c28bda25 RZ |
1836 | SETUP_HOSTDATA(instance); |
1837 | register int c = *count; | |
1838 | register unsigned char p = *phase; | |
1839 | register unsigned char *d = *data; | |
1840 | unsigned char tmp; | |
1841 | unsigned long flags; | |
1842 | ||
1843 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1844 | *phase = tmp; | |
1845 | return -1; | |
1846 | } | |
1da177e4 | 1847 | |
c28bda25 RZ |
1848 | if (atari_read_overruns && (p & SR_IO)) |
1849 | c -= atari_read_overruns; | |
1da177e4 | 1850 | |
d65e634a | 1851 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1852 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1853 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1854 | |
c28bda25 | 1855 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 LT |
1856 | |
1857 | #ifdef REAL_DMA | |
c28bda25 | 1858 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1da177e4 LT |
1859 | #endif /* def REAL_DMA */ |
1860 | ||
c28bda25 RZ |
1861 | if (IS_A_TT()) { |
1862 | /* On the Medusa, it is a must to initialize the DMA before | |
1863 | * starting the NCR. This is also the cleaner way for the TT. | |
1864 | */ | |
1865 | local_irq_save(flags); | |
1866 | hostdata->dma_len = (p & SR_IO) ? | |
1867 | NCR5380_dma_read_setup(instance, d, c) : | |
1868 | NCR5380_dma_write_setup(instance, d, c); | |
1869 | local_irq_restore(flags); | |
1870 | } | |
1871 | ||
1872 | if (p & SR_IO) | |
1873 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1874 | else { | |
1875 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1876 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1877 | } | |
1878 | ||
1879 | if (!IS_A_TT()) { | |
1880 | /* On the Falcon, the DMA setup must be done after the last */ | |
1881 | /* NCR access, else the DMA setup gets trashed! | |
1882 | */ | |
1883 | local_irq_save(flags); | |
1884 | hostdata->dma_len = (p & SR_IO) ? | |
1885 | NCR5380_dma_read_setup(instance, d, c) : | |
1886 | NCR5380_dma_write_setup(instance, d, c); | |
1887 | local_irq_restore(flags); | |
1888 | } | |
1889 | return 0; | |
1da177e4 LT |
1890 | } |
1891 | #endif /* defined(REAL_DMA) */ | |
1892 | ||
1893 | /* | |
1894 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1895 | * | |
c28bda25 RZ |
1896 | * Purpose : run through the various SCSI phases and do as the target |
1897 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1898 | * instance->connected. |
1899 | * | |
1900 | * Inputs : instance, instance for which we are doing commands | |
1901 | * | |
c28bda25 | 1902 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1903 | * modified if a command disconnects, *instance->connected will |
1904 | * change. | |
1905 | * | |
c28bda25 RZ |
1906 | * XXX Note : we need to watch for bus free or a reset condition here |
1907 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1908 | */ |
c28bda25 RZ |
1909 | |
1910 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1911 | { |
c28bda25 RZ |
1912 | SETUP_HOSTDATA(instance); |
1913 | unsigned long flags; | |
1914 | unsigned char msgout = NOP; | |
1915 | int sink = 0; | |
1916 | int len; | |
1da177e4 | 1917 | #if defined(REAL_DMA) |
c28bda25 | 1918 | int transfersize; |
1da177e4 | 1919 | #endif |
c28bda25 RZ |
1920 | unsigned char *data; |
1921 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
710ddd0d | 1922 | struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; |
c28bda25 RZ |
1923 | |
1924 | while (1) { | |
1925 | tmp = NCR5380_read(STATUS_REG); | |
1926 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1927 | if (tmp & SR_REQ) { | |
1928 | phase = (tmp & PHASE_MASK); | |
1929 | if (phase != old_phase) { | |
1930 | old_phase = phase; | |
8ad3a593 | 1931 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1932 | } |
1da177e4 | 1933 | |
c28bda25 RZ |
1934 | if (sink && (phase != PHASE_MSGOUT)) { |
1935 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1936 | ||
1937 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1938 | ICR_ASSERT_ACK); | |
1939 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1940 | ; | |
1941 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1942 | ICR_ASSERT_ATN); | |
1943 | sink = 0; | |
1944 | continue; | |
1945 | } | |
1946 | ||
1947 | switch (phase) { | |
1948 | case PHASE_DATAOUT: | |
1da177e4 | 1949 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
1950 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
1951 | "aborted\n", HOSTNO); | |
1952 | sink = 1; | |
1953 | do_abort(instance); | |
1954 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 1955 | cmd->scsi_done(cmd); |
c28bda25 | 1956 | return; |
1da177e4 | 1957 | #endif |
c28bda25 RZ |
1958 | case PHASE_DATAIN: |
1959 | /* | |
1960 | * If there is no room left in the current buffer in the | |
1961 | * scatter-gather list, move onto the next one. | |
1962 | */ | |
1963 | ||
1964 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
1965 | ++cmd->SCp.buffer; | |
1966 | --cmd->SCp.buffers_residual; | |
1967 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 1968 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
1969 | /* ++roman: Try to merge some scatter-buffers if |
1970 | * they are at contiguous physical addresses. | |
1971 | */ | |
1972 | merge_contiguous_buffers(cmd); | |
d65e634a | 1973 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
1974 | HOSTNO, cmd->SCp.this_residual, |
1975 | cmd->SCp.buffers_residual); | |
1976 | } | |
1977 | ||
1978 | /* | |
1979 | * The preferred transfer method is going to be | |
1980 | * PSEUDO-DMA for systems that are strictly PIO, | |
1981 | * since we can let the hardware do the handshaking. | |
1982 | * | |
1983 | * For this to work, we need to know the transfersize | |
1984 | * ahead of time, since the pseudo-DMA code will sit | |
1985 | * in an unconditional loop. | |
1986 | */ | |
1987 | ||
1988 | /* ++roman: I suggest, this should be | |
1989 | * #if def(REAL_DMA) | |
1990 | * instead of leaving REAL_DMA out. | |
1991 | */ | |
1da177e4 LT |
1992 | |
1993 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1994 | if (!cmd->device->borken && |
1995 | (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) { | |
1996 | len = transfersize; | |
1997 | cmd->SCp.phase = phase; | |
1998 | if (NCR5380_transfer_dma(instance, &phase, | |
1999 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2000 | /* | |
2001 | * If the watchdog timer fires, all future | |
2002 | * accesses to this device will use the | |
2003 | * polled-IO. */ | |
2004 | printk(KERN_NOTICE "scsi%d: switching target %d " | |
9cb78c16 | 2005 | "lun %llu to slow handshake\n", HOSTNO, |
c28bda25 RZ |
2006 | cmd->device->id, cmd->device->lun); |
2007 | cmd->device->borken = 1; | |
2008 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2009 | ICR_ASSERT_ATN); | |
2010 | sink = 1; | |
2011 | do_abort(instance); | |
2012 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2013 | cmd->scsi_done(cmd); |
c28bda25 RZ |
2014 | /* XXX - need to source or sink data here, as appropriate */ |
2015 | } else { | |
1da177e4 | 2016 | #ifdef REAL_DMA |
c28bda25 RZ |
2017 | /* ++roman: When using real DMA, |
2018 | * information_transfer() should return after | |
2019 | * starting DMA since it has nothing more to | |
2020 | * do. | |
2021 | */ | |
2022 | return; | |
2023 | #else | |
2024 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2025 | #endif |
c28bda25 RZ |
2026 | } |
2027 | } else | |
1da177e4 | 2028 | #endif /* defined(REAL_DMA) */ |
c28bda25 RZ |
2029 | NCR5380_transfer_pio(instance, &phase, |
2030 | (int *)&cmd->SCp.this_residual, | |
2031 | (unsigned char **)&cmd->SCp.ptr); | |
2032 | break; | |
2033 | case PHASE_MSGIN: | |
2034 | len = 1; | |
2035 | data = &tmp; | |
2036 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2037 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2038 | cmd->SCp.Message = tmp; | |
2039 | ||
2040 | switch (tmp) { | |
2041 | /* | |
2042 | * Linking lets us reduce the time required to get the | |
2043 | * next command out to the device, hopefully this will | |
2044 | * mean we don't waste another revolution due to the delays | |
2045 | * required by ARBITRATION and another SELECTION. | |
2046 | * | |
2047 | * In the current implementation proposal, low level drivers | |
2048 | * merely have to start the next command, pointed to by | |
2049 | * next_link, done() is called as with unlinked commands. | |
2050 | */ | |
1da177e4 | 2051 | #ifdef LINKED |
c28bda25 RZ |
2052 | case LINKED_CMD_COMPLETE: |
2053 | case LINKED_FLG_CMD_COMPLETE: | |
2054 | /* Accept message by clearing ACK */ | |
2055 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2056 | ||
9cb78c16 | 2057 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked command " |
c28bda25 RZ |
2058 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
2059 | ||
2060 | /* Enable reselect interrupts */ | |
2061 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2062 | /* | |
2063 | * Sanity check : A linked command should only terminate | |
2064 | * with one of these messages if there are more linked | |
2065 | * commands available. | |
2066 | */ | |
2067 | ||
2068 | if (!cmd->next_link) { | |
9cb78c16 | 2069 | printk(KERN_NOTICE "scsi%d: target %d lun %llu " |
c28bda25 RZ |
2070 | "linked command complete, no next_link\n", |
2071 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2072 | sink = 1; | |
2073 | do_abort(instance); | |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | initialize_SCp(cmd->next_link); | |
2078 | /* The next command is still part of this process; copy it | |
2079 | * and don't free it! */ | |
2080 | cmd->next_link->tag = cmd->tag; | |
2081 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
9cb78c16 | 2082 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %llu linked request " |
c28bda25 RZ |
2083 | "done, calling scsi_done().\n", |
2084 | HOSTNO, cmd->device->id, cmd->device->lun); | |
c28bda25 RZ |
2085 | cmd->scsi_done(cmd); |
2086 | cmd = hostdata->connected; | |
2087 | break; | |
1da177e4 | 2088 | #endif /* def LINKED */ |
c28bda25 RZ |
2089 | case ABORT: |
2090 | case COMMAND_COMPLETE: | |
2091 | /* Accept message by clearing ACK */ | |
2092 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2093 | /* ++guenther: possible race with Falcon locking */ | |
2094 | falcon_dont_release++; | |
2095 | hostdata->connected = NULL; | |
9cb78c16 | 2096 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %llu " |
c28bda25 | 2097 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
1da177e4 | 2098 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2099 | cmd_free_tag(cmd); |
2100 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
2101 | /* Turn a QUEUE FULL status into BUSY, I think the | |
2102 | * mid level cannot handle QUEUE FULL :-( (The | |
2103 | * command is retried after BUSY). Also update our | |
2104 | * queue size to the number of currently issued | |
2105 | * commands now. | |
2106 | */ | |
2107 | /* ++Andreas: the mid level code knows about | |
2108 | QUEUE_FULL now. */ | |
2109 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
9cb78c16 | 2110 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu returned " |
c28bda25 RZ |
2111 | "QUEUE_FULL after %d commands\n", |
2112 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2113 | ta->nr_allocated); | |
2114 | if (ta->queue_size > ta->nr_allocated) | |
2115 | ta->nr_allocated = ta->queue_size; | |
2116 | } | |
1da177e4 | 2117 | #else |
c28bda25 | 2118 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2119 | #endif |
c28bda25 RZ |
2120 | /* Enable reselect interrupts */ |
2121 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2122 | ||
2123 | /* | |
2124 | * I'm not sure what the correct thing to do here is : | |
2125 | * | |
2126 | * If the command that just executed is NOT a request | |
2127 | * sense, the obvious thing to do is to set the result | |
2128 | * code to the values of the stored parameters. | |
2129 | * | |
2130 | * If it was a REQUEST SENSE command, we need some way to | |
2131 | * differentiate between the failure code of the original | |
2132 | * and the failure code of the REQUEST sense - the obvious | |
2133 | * case is success, where we fall through and leave the | |
2134 | * result code unchanged. | |
2135 | * | |
2136 | * The non-obvious place is where the REQUEST SENSE failed | |
2137 | */ | |
2138 | ||
2139 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2140 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2141 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2142 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2143 | |
28424d3a BH |
2144 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2145 | hostdata->ses.cmd_len) { | |
2146 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2147 | hostdata->ses.cmd_len = 0 ; | |
2148 | } | |
2149 | ||
c28bda25 RZ |
2150 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2151 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2152 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2153 | ||
d65e634a | 2154 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 RZ |
2155 | |
2156 | local_irq_save(flags); | |
2157 | LIST(cmd,hostdata->issue_queue); | |
3130d905 | 2158 | SET_NEXT(cmd, hostdata->issue_queue); |
710ddd0d | 2159 | hostdata->issue_queue = (struct scsi_cmnd *) cmd; |
c28bda25 | 2160 | local_irq_restore(flags); |
d65e634a | 2161 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
c28bda25 | 2162 | "issue queue\n", H_NO(cmd)); |
997acab7 | 2163 | } else { |
c28bda25 RZ |
2164 | cmd->scsi_done(cmd); |
2165 | } | |
2166 | ||
2167 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2168 | /* | |
2169 | * Restore phase bits to 0 so an interrupted selection, | |
2170 | * arbitration can resume. | |
2171 | */ | |
2172 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2173 | ||
2174 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2175 | barrier(); | |
2176 | ||
2177 | falcon_dont_release--; | |
2178 | /* ++roman: For Falcon SCSI, release the lock on the | |
2179 | * ST-DMA here if no other commands are waiting on the | |
2180 | * disconnected queue. | |
2181 | */ | |
2182 | falcon_release_lock_if_possible(hostdata); | |
2183 | return; | |
2184 | case MESSAGE_REJECT: | |
2185 | /* Accept message by clearing ACK */ | |
2186 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2187 | /* Enable reselect interrupts */ | |
2188 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2189 | switch (hostdata->last_message) { | |
2190 | case HEAD_OF_QUEUE_TAG: | |
2191 | case ORDERED_QUEUE_TAG: | |
2192 | case SIMPLE_QUEUE_TAG: | |
2193 | /* The target obviously doesn't support tagged | |
2194 | * queuing, even though it announced this ability in | |
2195 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2196 | * clear 'tagged_supported' and lock the LUN, since | |
2197 | * the command is treated as untagged further on. | |
2198 | */ | |
2199 | cmd->device->tagged_supported = 0; | |
2200 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2201 | cmd->tag = TAG_NONE; | |
9cb78c16 | 2202 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %llu rejected " |
c28bda25 RZ |
2203 | "QUEUE_TAG message; tagged queuing " |
2204 | "disabled\n", | |
2205 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2206 | break; | |
2207 | } | |
2208 | break; | |
2209 | case DISCONNECT: | |
2210 | /* Accept message by clearing ACK */ | |
2211 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2212 | local_irq_save(flags); | |
2213 | cmd->device->disconnect = 1; | |
2214 | LIST(cmd,hostdata->disconnected_queue); | |
3130d905 | 2215 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2216 | hostdata->connected = NULL; |
2217 | hostdata->disconnected_queue = cmd; | |
2218 | local_irq_restore(flags); | |
9cb78c16 | 2219 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %llu was " |
c28bda25 RZ |
2220 | "moved from connected to the " |
2221 | "disconnected_queue\n", HOSTNO, | |
2222 | cmd->device->id, cmd->device->lun); | |
2223 | /* | |
2224 | * Restore phase bits to 0 so an interrupted selection, | |
2225 | * arbitration can resume. | |
2226 | */ | |
2227 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2228 | ||
2229 | /* Enable reselect interrupts */ | |
2230 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2231 | /* Wait for bus free to avoid nasty timeouts */ | |
2232 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2233 | barrier(); | |
2234 | return; | |
2235 | /* | |
2236 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2237 | * operation, in violation of the SCSI spec so we can safely | |
2238 | * ignore SAVE/RESTORE pointers calls. | |
2239 | * | |
2240 | * Unfortunately, some disks violate the SCSI spec and | |
2241 | * don't issue the required SAVE_POINTERS message before | |
2242 | * disconnecting, and we have to break spec to remain | |
2243 | * compatible. | |
2244 | */ | |
2245 | case SAVE_POINTERS: | |
2246 | case RESTORE_POINTERS: | |
2247 | /* Accept message by clearing ACK */ | |
2248 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2249 | /* Enable reselect interrupts */ | |
2250 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2251 | break; | |
2252 | case EXTENDED_MESSAGE: | |
2253 | /* | |
2254 | * Extended messages are sent in the following format : | |
2255 | * Byte | |
2256 | * 0 EXTENDED_MESSAGE == 1 | |
2257 | * 1 length (includes one byte for code, doesn't | |
2258 | * include first two bytes) | |
2259 | * 2 code | |
2260 | * 3..length+1 arguments | |
2261 | * | |
2262 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2263 | * byte, since spi_print_msg() wants the whole thing. | |
2264 | */ | |
2265 | extended_msg[0] = EXTENDED_MESSAGE; | |
2266 | /* Accept first byte by clearing ACK */ | |
2267 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2268 | ||
d65e634a | 2269 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2270 | |
2271 | len = 2; | |
2272 | data = extended_msg + 1; | |
2273 | phase = PHASE_MSGIN; | |
2274 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2275 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2276 | (int)extended_msg[1], (int)extended_msg[2]); |
2277 | ||
2278 | if (!len && extended_msg[1] <= | |
2279 | (sizeof(extended_msg) - 1)) { | |
2280 | /* Accept third byte by clearing ACK */ | |
2281 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2282 | len = extended_msg[1] - 1; | |
2283 | data = extended_msg + 3; | |
2284 | phase = PHASE_MSGIN; | |
2285 | ||
2286 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2287 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2288 | HOSTNO, len); |
2289 | ||
2290 | switch (extended_msg[2]) { | |
2291 | case EXTENDED_SDTR: | |
2292 | case EXTENDED_WDTR: | |
2293 | case EXTENDED_MODIFY_DATA_POINTER: | |
2294 | case EXTENDED_EXTENDED_IDENTIFY: | |
2295 | tmp = 0; | |
2296 | } | |
2297 | } else if (len) { | |
2298 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2299 | "extended message\n", HOSTNO); | |
2300 | tmp = 0; | |
2301 | } else { | |
2302 | printk(KERN_NOTICE "scsi%d: extended message " | |
2303 | "code %02x length %d is too long\n", | |
2304 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2305 | tmp = 0; | |
2306 | } | |
2307 | /* Fall through to reject message */ | |
2308 | ||
2309 | /* | |
2310 | * If we get something weird that we aren't expecting, | |
2311 | * reject it. | |
2312 | */ | |
2313 | default: | |
2314 | if (!tmp) { | |
2315 | printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); | |
2316 | spi_print_msg(extended_msg); | |
2317 | printk("\n"); | |
2318 | } else if (tmp != EXTENDED_MESSAGE) | |
2319 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
9cb78c16 | 2320 | "message %02x from target %d, lun %llu\n", |
c28bda25 RZ |
2321 | HOSTNO, tmp, cmd->device->id, cmd->device->lun); |
2322 | else | |
2323 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
2324 | "extended message " | |
9cb78c16 | 2325 | "code %02x, length %d from target %d, lun %llu\n", |
c28bda25 RZ |
2326 | HOSTNO, extended_msg[1], extended_msg[0], |
2327 | cmd->device->id, cmd->device->lun); | |
2328 | ||
2329 | ||
2330 | msgout = MESSAGE_REJECT; | |
2331 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2332 | break; | |
2333 | } /* switch (tmp) */ | |
2334 | break; | |
2335 | case PHASE_MSGOUT: | |
2336 | len = 1; | |
2337 | data = &msgout; | |
2338 | hostdata->last_message = msgout; | |
2339 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2340 | if (msgout == ABORT) { | |
1da177e4 | 2341 | #ifdef SUPPORT_TAGS |
c28bda25 | 2342 | cmd_free_tag(cmd); |
1da177e4 | 2343 | #else |
c28bda25 | 2344 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2345 | #endif |
c28bda25 RZ |
2346 | hostdata->connected = NULL; |
2347 | cmd->result = DID_ERROR << 16; | |
c28bda25 RZ |
2348 | cmd->scsi_done(cmd); |
2349 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2350 | falcon_release_lock_if_possible(hostdata); | |
2351 | return; | |
2352 | } | |
2353 | msgout = NOP; | |
2354 | break; | |
2355 | case PHASE_CMDOUT: | |
2356 | len = cmd->cmd_len; | |
2357 | data = cmd->cmnd; | |
2358 | /* | |
2359 | * XXX for performance reasons, on machines with a | |
2360 | * PSEUDO-DMA architecture we should probably | |
2361 | * use the dma transfer function. | |
2362 | */ | |
2363 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2364 | break; | |
2365 | case PHASE_STATIN: | |
2366 | len = 1; | |
2367 | data = &tmp; | |
2368 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2369 | cmd->SCp.Status = tmp; | |
2370 | break; | |
2371 | default: | |
2372 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2373 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
2374 | } /* switch(phase) */ |
2375 | } /* if (tmp * SR_REQ) */ | |
2376 | } /* while (1) */ | |
1da177e4 LT |
2377 | } |
2378 | ||
2379 | /* | |
2380 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2381 | * | |
c28bda25 | 2382 | * Purpose : does reselection, initializing the instance->connected |
710ddd0d | 2383 | * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q |
1da177e4 | 2384 | * nexus has been reestablished, |
c28bda25 | 2385 | * |
1da177e4 LT |
2386 | * Inputs : instance - this instance of the NCR5380. |
2387 | * | |
2388 | */ | |
2389 | ||
2390 | ||
c28bda25 | 2391 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2392 | { |
c28bda25 RZ |
2393 | SETUP_HOSTDATA(instance); |
2394 | unsigned char target_mask; | |
2395 | unsigned char lun, phase; | |
2396 | int len; | |
1da177e4 | 2397 | #ifdef SUPPORT_TAGS |
c28bda25 | 2398 | unsigned char tag; |
1da177e4 | 2399 | #endif |
c28bda25 RZ |
2400 | unsigned char msg[3]; |
2401 | unsigned char *data; | |
710ddd0d | 2402 | struct scsi_cmnd *tmp = NULL, *prev; |
c28bda25 RZ |
2403 | /* unsigned long flags; */ |
2404 | ||
2405 | /* | |
2406 | * Disable arbitration, etc. since the host adapter obviously | |
2407 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2408 | */ | |
2409 | ||
2410 | NCR5380_write(MODE_REG, MR_BASE); | |
2411 | hostdata->restart_select = 1; | |
2412 | ||
2413 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2414 | ||
d65e634a | 2415 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2416 | |
2417 | /* | |
2418 | * At this point, we have detected that our SCSI ID is on the bus, | |
2419 | * SEL is true and BSY was false for at least one bus settle delay | |
2420 | * (400 ns). | |
2421 | * | |
2422 | * We must assert BSY ourselves, until the target drops the SEL | |
2423 | * signal. | |
2424 | */ | |
2425 | ||
2426 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2427 | ||
2428 | while (NCR5380_read(STATUS_REG) & SR_SEL) | |
2429 | ; | |
2430 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2431 | ||
2432 | /* | |
2433 | * Wait for target to go into MSGIN. | |
2434 | */ | |
2435 | ||
2436 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
2437 | ; | |
2438 | ||
2439 | len = 1; | |
2440 | data = msg; | |
2441 | phase = PHASE_MSGIN; | |
2442 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2443 | ||
2444 | if (!(msg[0] & 0x80)) { | |
2445 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | |
2446 | spi_print_msg(msg); | |
2447 | do_abort(instance); | |
2448 | return; | |
2449 | } | |
2450 | lun = (msg[0] & 0x07); | |
1da177e4 LT |
2451 | |
2452 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
2453 | /* If the phase is still MSGIN, the target wants to send some more |
2454 | * messages. In case it supports tagged queuing, this is probably a | |
2455 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2456 | */ | |
2457 | tag = TAG_NONE; | |
2458 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2459 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2460 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2461 | len = 2; | |
2462 | data = msg + 1; | |
2463 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2464 | msg[1] == SIMPLE_QUEUE_TAG) | |
2465 | tag = msg[2]; | |
d65e634a | 2466 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2467 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2468 | } | |
1da177e4 | 2469 | #endif |
c28bda25 RZ |
2470 | |
2471 | /* | |
2472 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2473 | * just reestablished, and remove it from the disconnected queue. | |
2474 | */ | |
2475 | ||
710ddd0d | 2476 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; |
c28bda25 RZ |
2477 | tmp; prev = tmp, tmp = NEXT(tmp)) { |
2478 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
1da177e4 | 2479 | #ifdef SUPPORT_TAGS |
c28bda25 | 2480 | && (tag == tmp->tag) |
1da177e4 | 2481 | #endif |
c28bda25 RZ |
2482 | ) { |
2483 | /* ++guenther: prevent race with falcon_release_lock */ | |
2484 | falcon_dont_release++; | |
2485 | if (prev) { | |
2486 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2487 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2488 | } else { |
2489 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2490 | hostdata->disconnected_queue = NEXT(tmp); | |
2491 | } | |
3130d905 | 2492 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2493 | break; |
2494 | } | |
1da177e4 | 2495 | } |
c28bda25 RZ |
2496 | |
2497 | if (!tmp) { | |
2498 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | |
1da177e4 | 2499 | #ifdef SUPPORT_TAGS |
c28bda25 | 2500 | "tag %d " |
1da177e4 | 2501 | #endif |
c28bda25 RZ |
2502 | "not in disconnected_queue.\n", |
2503 | HOSTNO, target_mask, lun | |
1da177e4 | 2504 | #ifdef SUPPORT_TAGS |
c28bda25 | 2505 | , tag |
1da177e4 | 2506 | #endif |
c28bda25 RZ |
2507 | ); |
2508 | /* | |
2509 | * Since we have an established nexus that we can't do anything | |
2510 | * with, we must abort it. | |
2511 | */ | |
2512 | do_abort(instance); | |
2513 | return; | |
2514 | } | |
1da177e4 | 2515 | |
c28bda25 RZ |
2516 | /* Accept message by clearing ACK */ |
2517 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2518 | |
c28bda25 | 2519 | hostdata->connected = tmp; |
9cb78c16 | 2520 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %llu, tag = %d\n", |
c28bda25 RZ |
2521 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
2522 | falcon_dont_release--; | |
1da177e4 LT |
2523 | } |
2524 | ||
2525 | ||
2526 | /* | |
710ddd0d | 2527 | * Function : int NCR5380_abort (struct scsi_cmnd *cmd) |
1da177e4 LT |
2528 | * |
2529 | * Purpose : abort a command | |
2530 | * | |
710ddd0d | 2531 | * Inputs : cmd - the scsi_cmnd to abort, code - code to set the |
c28bda25 | 2532 | * host byte of the result field to, if zero DID_ABORTED is |
1da177e4 LT |
2533 | * used. |
2534 | * | |
b6c92b7e | 2535 | * Returns : SUCCESS - success, FAILED on failure. |
1da177e4 | 2536 | * |
c28bda25 RZ |
2537 | * XXX - there is no way to abort the command that is currently |
2538 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2539 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2540 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2541 | */ |
2542 | ||
2543 | static | |
710ddd0d | 2544 | int NCR5380_abort(struct scsi_cmnd *cmd) |
1da177e4 | 2545 | { |
c28bda25 RZ |
2546 | struct Scsi_Host *instance = cmd->device->host; |
2547 | SETUP_HOSTDATA(instance); | |
710ddd0d | 2548 | struct scsi_cmnd *tmp, **prev; |
c28bda25 | 2549 | unsigned long flags; |
1da177e4 | 2550 | |
1fa6b5fb | 2551 | scmd_printk(KERN_NOTICE, cmd, "aborting command\n"); |
1da177e4 | 2552 | |
c28bda25 RZ |
2553 | NCR5380_print_status(instance); |
2554 | ||
2555 | local_irq_save(flags); | |
1da177e4 | 2556 | |
c28bda25 RZ |
2557 | if (!IS_A_TT() && !falcon_got_lock) |
2558 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n", | |
2559 | HOSTNO); | |
1da177e4 | 2560 | |
d65e634a | 2561 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2562 | NCR5380_read(BUS_AND_STATUS_REG), |
2563 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2564 | |
2565 | #if 1 | |
c28bda25 RZ |
2566 | /* |
2567 | * Case 1 : If the command is the currently executing command, | |
2568 | * we'll set the aborted flag and return control so that | |
2569 | * information transfer routine can exit cleanly. | |
2570 | */ | |
1da177e4 | 2571 | |
c28bda25 | 2572 | if (hostdata->connected == cmd) { |
1da177e4 | 2573 | |
d65e634a | 2574 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2575 | /* |
2576 | * We should perform BSY checking, and make sure we haven't slipped | |
2577 | * into BUS FREE. | |
2578 | */ | |
1da177e4 | 2579 | |
c28bda25 RZ |
2580 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2581 | /* | |
2582 | * Since we can't change phases until we've completed the current | |
2583 | * handshake, we have to source or sink a byte of data if the current | |
2584 | * phase is not MSGOUT. | |
2585 | */ | |
1da177e4 | 2586 | |
c28bda25 RZ |
2587 | /* |
2588 | * Return control to the executing NCR drive so we can clear the | |
2589 | * aborted flag and get back into our main loop. | |
2590 | */ | |
1da177e4 | 2591 | |
c28bda25 RZ |
2592 | if (do_abort(instance) == 0) { |
2593 | hostdata->aborted = 1; | |
2594 | hostdata->connected = NULL; | |
2595 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2596 | #ifdef SUPPORT_TAGS |
c28bda25 | 2597 | cmd_free_tag(cmd); |
1da177e4 | 2598 | #else |
c28bda25 | 2599 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2600 | #endif |
c28bda25 RZ |
2601 | local_irq_restore(flags); |
2602 | cmd->scsi_done(cmd); | |
2603 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2604 | return SUCCESS; |
c28bda25 RZ |
2605 | } else { |
2606 | /* local_irq_restore(flags); */ | |
2607 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); | |
2b0f834c | 2608 | return FAILED; |
c28bda25 RZ |
2609 | } |
2610 | } | |
1da177e4 LT |
2611 | #endif |
2612 | ||
c28bda25 RZ |
2613 | /* |
2614 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2615 | * from the issue queue. | |
2616 | */ | |
710ddd0d FT |
2617 | for (prev = (struct scsi_cmnd **)&(hostdata->issue_queue), |
2618 | tmp = (struct scsi_cmnd *)hostdata->issue_queue; | |
c28bda25 RZ |
2619 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2620 | if (cmd == tmp) { | |
2621 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2622 | (*prev) = NEXT(tmp); | |
3130d905 | 2623 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2624 | tmp->result = DID_ABORT << 16; |
2625 | local_irq_restore(flags); | |
d65e634a | 2626 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2627 | HOSTNO); |
2628 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2629 | * yet... */ | |
2630 | tmp->scsi_done(tmp); | |
2631 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2632 | return SUCCESS; |
c28bda25 | 2633 | } |
1da177e4 LT |
2634 | } |
2635 | ||
c28bda25 RZ |
2636 | /* |
2637 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2638 | * and let the high level SCSI driver retry at a later time or | |
2639 | * issue a reset. | |
2640 | * | |
2641 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2642 | * and handling them cleanly in this situation would make the common | |
2643 | * case of noresets less efficient, and would pollute our code. So, | |
2644 | * we fail. | |
2645 | */ | |
1da177e4 | 2646 | |
c28bda25 RZ |
2647 | if (hostdata->connected) { |
2648 | local_irq_restore(flags); | |
d65e634a | 2649 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2650 | return FAILED; |
c28bda25 | 2651 | } |
1da177e4 | 2652 | |
c28bda25 RZ |
2653 | /* |
2654 | * Case 4: If the command is currently disconnected from the bus, and | |
2655 | * there are no connected commands, we reconnect the I_T_L or | |
2656 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2657 | * an abort message. | |
2658 | * | |
2659 | * This case is especially ugly. In order to reestablish the nexus, we | |
2660 | * need to call NCR5380_select(). The easiest way to implement this | |
2661 | * function was to abort if the bus was busy, and let the interrupt | |
2662 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2663 | * where necessary, meaning interrupts need to be enabled. | |
2664 | * | |
2665 | * When interrupts are enabled, the queues may change - so we | |
2666 | * can't remove it from the disconnected queue before selecting it | |
2667 | * because that could cause a failure in hashing the nexus if that | |
2668 | * device reselected. | |
2669 | * | |
2670 | * Since the queues may change, we can't use the pointers from when we | |
2671 | * first locate it. | |
2672 | * | |
2673 | * So, we must first locate the command, and if NCR5380_select() | |
2674 | * succeeds, then issue the abort, relocate the command and remove | |
2675 | * it from the disconnected queue. | |
2676 | */ | |
2677 | ||
710ddd0d | 2678 | for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; |
c28bda25 RZ |
2679 | tmp = NEXT(tmp)) { |
2680 | if (cmd == tmp) { | |
2681 | local_irq_restore(flags); | |
d65e634a | 2682 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 | 2683 | |
76f13b93 | 2684 | if (NCR5380_select(instance, cmd)) |
2b0f834c | 2685 | return FAILED; |
1da177e4 | 2686 | |
d65e634a | 2687 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2688 | |
2689 | do_abort(instance); | |
2690 | ||
2691 | local_irq_save(flags); | |
710ddd0d FT |
2692 | for (prev = (struct scsi_cmnd **)&(hostdata->disconnected_queue), |
2693 | tmp = (struct scsi_cmnd *)hostdata->disconnected_queue; | |
c28bda25 RZ |
2694 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { |
2695 | if (cmd == tmp) { | |
2696 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2697 | *prev = NEXT(tmp); | |
3130d905 | 2698 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2699 | tmp->result = DID_ABORT << 16; |
2700 | /* We must unlock the tag/LUN immediately here, since the | |
2701 | * target goes to BUS FREE and doesn't send us another | |
2702 | * message (COMMAND_COMPLETE or the like) | |
2703 | */ | |
1da177e4 | 2704 | #ifdef SUPPORT_TAGS |
c28bda25 | 2705 | cmd_free_tag(tmp); |
1da177e4 | 2706 | #else |
c28bda25 | 2707 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2708 | #endif |
c28bda25 RZ |
2709 | local_irq_restore(flags); |
2710 | tmp->scsi_done(tmp); | |
2711 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2712 | return SUCCESS; |
c28bda25 RZ |
2713 | } |
2714 | } | |
1da177e4 LT |
2715 | } |
2716 | } | |
2717 | ||
c28bda25 RZ |
2718 | /* |
2719 | * Case 5 : If we reached this point, the command was not found in any of | |
2720 | * the queues. | |
2721 | * | |
2722 | * We probably reached this point because of an unlikely race condition | |
2723 | * between the command completing successfully and the abortion code, | |
2724 | * so we won't panic, but we will notify the user in case something really | |
2725 | * broke. | |
2726 | */ | |
1da177e4 | 2727 | |
c28bda25 | 2728 | local_irq_restore(flags); |
ad361c98 | 2729 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2730 | |
c28bda25 RZ |
2731 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2732 | * possible at all) At least, we should check if the lock could be | |
2733 | * released after the abort, in case it is kept due to some bug. | |
2734 | */ | |
2735 | falcon_release_lock_if_possible(hostdata); | |
1da177e4 | 2736 | |
2b0f834c | 2737 | return FAILED; |
1da177e4 LT |
2738 | } |
2739 | ||
2740 | ||
c28bda25 | 2741 | /* |
710ddd0d | 2742 | * Function : int NCR5380_reset (struct scsi_cmnd *cmd) |
c28bda25 | 2743 | * |
1da177e4 LT |
2744 | * Purpose : reset the SCSI bus. |
2745 | * | |
2b0f834c | 2746 | * Returns : SUCCESS or FAILURE |
1da177e4 | 2747 | * |
c28bda25 | 2748 | */ |
1da177e4 | 2749 | |
710ddd0d | 2750 | static int NCR5380_bus_reset(struct scsi_cmnd *cmd) |
1da177e4 | 2751 | { |
c28bda25 RZ |
2752 | SETUP_HOSTDATA(cmd->device->host); |
2753 | int i; | |
2754 | unsigned long flags; | |
2b0f834c | 2755 | #if defined(RESET_RUN_DONE) |
710ddd0d | 2756 | struct scsi_cmnd *connected, *disconnected_queue; |
1da177e4 LT |
2757 | #endif |
2758 | ||
c28bda25 RZ |
2759 | if (!IS_A_TT() && !falcon_got_lock) |
2760 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n", | |
2761 | H_NO(cmd)); | |
2762 | ||
2763 | NCR5380_print_status(cmd->device->host); | |
2764 | ||
2765 | /* get in phase */ | |
2766 | NCR5380_write(TARGET_COMMAND_REG, | |
2767 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); | |
2768 | /* assert RST */ | |
2769 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
2770 | udelay(40); | |
2771 | /* reset NCR registers */ | |
2772 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2773 | NCR5380_write(MODE_REG, MR_BASE); | |
2774 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2775 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2776 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get | |
2777 | * through anymore ... */ | |
2778 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
2779 | ||
2b0f834c MS |
2780 | /* MSch 20140115 - looking at the generic NCR5380 driver, all of this |
2781 | * should go. | |
2782 | * Catch-22: if we don't clear all queues, the SCSI driver lock will | |
2783 | * not be reset by atari_scsi_reset()! | |
2784 | */ | |
2785 | ||
2786 | #if defined(RESET_RUN_DONE) | |
2787 | /* XXX Should now be done by midlevel code, but it's broken XXX */ | |
c28bda25 RZ |
2788 | /* XXX see below XXX */ |
2789 | ||
2790 | /* MSch: old-style reset: actually abort all command processing here */ | |
2791 | ||
2792 | /* After the reset, there are no more connected or disconnected commands | |
2793 | * and no busy units; to avoid problems with re-inserting the commands | |
2794 | * into the issue_queue (via scsi_done()), the aborted commands are | |
2795 | * remembered in local variables first. | |
2796 | */ | |
2797 | local_irq_save(flags); | |
710ddd0d | 2798 | connected = (struct scsi_cmnd *)hostdata->connected; |
c28bda25 | 2799 | hostdata->connected = NULL; |
710ddd0d | 2800 | disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue; |
c28bda25 | 2801 | hostdata->disconnected_queue = NULL; |
1da177e4 | 2802 | #ifdef SUPPORT_TAGS |
c28bda25 | 2803 | free_all_tags(); |
1da177e4 | 2804 | #endif |
c28bda25 RZ |
2805 | for (i = 0; i < 8; ++i) |
2806 | hostdata->busy[i] = 0; | |
1da177e4 | 2807 | #ifdef REAL_DMA |
c28bda25 | 2808 | hostdata->dma_len = 0; |
1da177e4 | 2809 | #endif |
c28bda25 | 2810 | local_irq_restore(flags); |
1da177e4 | 2811 | |
c28bda25 RZ |
2812 | /* In order to tell the mid-level code which commands were aborted, |
2813 | * set the command status to DID_RESET and call scsi_done() !!! | |
2814 | * This ultimately aborts processing of these commands in the mid-level. | |
2815 | */ | |
1da177e4 | 2816 | |
c28bda25 | 2817 | if ((cmd = connected)) { |
d65e634a | 2818 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 RZ |
2819 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2820 | cmd->scsi_done(cmd); | |
2821 | } | |
1da177e4 | 2822 | |
c28bda25 RZ |
2823 | for (i = 0; (cmd = disconnected_queue); ++i) { |
2824 | disconnected_queue = NEXT(cmd); | |
3130d905 | 2825 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
2826 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2827 | cmd->scsi_done(cmd); | |
2828 | } | |
2829 | if (i > 0) | |
d65e634a | 2830 | dprintk(NDEBUG_ABORT, "scsi: reset aborted %d disconnected command(s)\n", i); |
1da177e4 | 2831 | |
c28bda25 RZ |
2832 | /* The Falcon lock should be released after a reset... |
2833 | */ | |
2834 | /* ++guenther: moved to atari_scsi_reset(), to prevent a race between | |
2835 | * unlocking and enabling dma interrupt. | |
2836 | */ | |
2837 | /* falcon_release_lock_if_possible( hostdata );*/ | |
1da177e4 | 2838 | |
c28bda25 RZ |
2839 | /* since all commands have been explicitly terminated, we need to tell |
2840 | * the midlevel code that the reset was SUCCESSFUL, and there is no | |
2841 | * need to 'wake up' the commands by a request_sense | |
2842 | */ | |
2b0f834c | 2843 | return SUCCESS; |
1da177e4 LT |
2844 | #else /* 1 */ |
2845 | ||
c28bda25 RZ |
2846 | /* MSch: new-style reset handling: let the mid-level do what it can */ |
2847 | ||
2848 | /* ++guenther: MID-LEVEL IS STILL BROKEN. | |
2849 | * Mid-level is supposed to requeue all commands that were active on the | |
2850 | * various low-level queues. In fact it does this, but that's not enough | |
2851 | * because all these commands are subject to timeout. And if a timeout | |
2852 | * happens for any removed command, *_abort() is called but all queues | |
2853 | * are now empty. Abort then gives up the falcon lock, which is fatal, | |
2854 | * since the mid-level will queue more commands and must have the lock | |
2855 | * (it's all happening inside timer interrupt handler!!). | |
2856 | * Even worse, abort will return NOT_RUNNING for all those commands not | |
2857 | * on any queue, so they won't be retried ... | |
2858 | * | |
2859 | * Conclusion: either scsi.c disables timeout for all resetted commands | |
2860 | * immediately, or we lose! As of linux-2.0.20 it doesn't. | |
2861 | */ | |
2862 | ||
2863 | /* After the reset, there are no more connected or disconnected commands | |
2864 | * and no busy units; so clear the low-level status here to avoid | |
2865 | * conflicts when the mid-level code tries to wake up the affected | |
2866 | * commands! | |
2867 | */ | |
2868 | ||
2869 | if (hostdata->issue_queue) | |
d65e634a | 2870 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
c28bda25 | 2871 | if (hostdata->connected) |
d65e634a | 2872 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 | 2873 | if (hostdata->disconnected_queue) |
d65e634a | 2874 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
c28bda25 RZ |
2875 | |
2876 | local_irq_save(flags); | |
2877 | hostdata->issue_queue = NULL; | |
2878 | hostdata->connected = NULL; | |
2879 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2880 | #ifdef SUPPORT_TAGS |
c28bda25 | 2881 | free_all_tags(); |
1da177e4 | 2882 | #endif |
c28bda25 RZ |
2883 | for (i = 0; i < 8; ++i) |
2884 | hostdata->busy[i] = 0; | |
1da177e4 | 2885 | #ifdef REAL_DMA |
c28bda25 | 2886 | hostdata->dma_len = 0; |
1da177e4 | 2887 | #endif |
c28bda25 | 2888 | local_irq_restore(flags); |
1da177e4 | 2889 | |
c28bda25 | 2890 | /* we did no complete reset of all commands, so a wakeup is required */ |
2b0f834c | 2891 | return SUCCESS; |
1da177e4 LT |
2892 | #endif /* 1 */ |
2893 | } |