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c28bda25 | 1 | /* |
1da177e4 | 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
c28bda25 | 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
1da177e4 LT |
4 | * architecture. |
5 | * | |
6 | * Note that these routines also work with NR53c400 family chips. | |
7 | * | |
8 | * Copyright 1993, Drew Eckhardt | |
c28bda25 | 9 | * Visionary Computing |
1da177e4 | 10 | * (Unix and Linux consulting and custom programming) |
c28bda25 | 11 | * drew@colorado.edu |
1da177e4 LT |
12 | * +1 (303) 666-5836 |
13 | * | |
c28bda25 | 14 | * DISTRIBUTION RELEASE 6. |
1da177e4 | 15 | * |
c28bda25 | 16 | * For more information, please consult |
1da177e4 LT |
17 | * |
18 | * NCR 5380 Family | |
19 | * SCSI Protocol Controller | |
20 | * Databook | |
21 | * | |
22 | * NCR Microelectronics | |
23 | * 1635 Aeroplaza Drive | |
24 | * Colorado Springs, CO 80916 | |
25 | * 1+ (719) 578-3400 | |
26 | * 1+ (800) 334-5454 | |
27 | */ | |
28 | ||
29 | /* | |
30 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in | |
31 | * this file, too: | |
32 | * | |
33 | * - Some of the debug statements were incorrect (undefined variables and the | |
34 | * like). I fixed that. | |
35 | * | |
36 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the | |
37 | * possible DMA transfer size should also happen for REAL_DMA. I added this | |
38 | * in the #if statement. | |
39 | * | |
40 | * - When using real DMA, information_transfer() should return in a DATAOUT | |
41 | * phase after starting the DMA. It has nothing more to do. | |
42 | * | |
43 | * - The interrupt service routine should run main after end of DMA, too (not | |
44 | * only after RESELECTION interrupts). Additionally, it should _not_ test | |
45 | * for more interrupts after running main, since a DMA process may have | |
46 | * been started and interrupts are turned on now. The new int could happen | |
47 | * inside the execution of NCR5380_intr(), leading to recursive | |
48 | * calls. | |
49 | * | |
50 | * - I've added a function merge_contiguous_buffers() that tries to | |
51 | * merge scatter-gather buffers that are located at contiguous | |
52 | * physical addresses and can be processed with the same DMA setup. | |
53 | * Since most scatter-gather operations work on a page (4K) of | |
54 | * 4 buffers (1K), in more than 90% of all cases three interrupts and | |
55 | * DMA setup actions are saved. | |
56 | * | |
57 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA | |
58 | * and USLEEP, because these were messing up readability and will never be | |
59 | * needed for Atari SCSI. | |
c28bda25 | 60 | * |
1da177e4 LT |
61 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
62 | * stuff), and 'main' is executed in a bottom half if awoken by an | |
63 | * interrupt. | |
64 | * | |
65 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." | |
66 | * constructs. In my eyes, this made the source rather unreadable, so I | |
67 | * finally replaced that by the *_PRINTK() macros. | |
68 | * | |
69 | */ | |
70 | ||
71 | /* | |
c28bda25 RZ |
72 | * Further development / testing that should be done : |
73 | * 1. Test linked command handling code after Eric is ready with | |
1da177e4 LT |
74 | * the high level code. |
75 | */ | |
db9dff36 | 76 | #include <scsi/scsi_dbg.h> |
1abfd370 | 77 | #include <scsi/scsi_transport_spi.h> |
1da177e4 LT |
78 | |
79 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 RZ |
80 | #define LIST(x, y) \ |
81 | do { \ | |
82 | printk("LINE:%d Adding %p to %p\n", \ | |
83 | __LINE__, (void*)(x), (void*)(y)); \ | |
84 | if ((x) == (y)) \ | |
85 | udelay(5); \ | |
86 | } while (0) | |
87 | #define REMOVE(w, x, y, z) \ | |
88 | do { \ | |
89 | printk("LINE:%d Removing: %p->%p %p->%p \n", \ | |
90 | __LINE__, (void*)(w), (void*)(x), \ | |
91 | (void*)(y), (void*)(z)); \ | |
92 | if ((x) == (y)) \ | |
93 | udelay(5); \ | |
94 | } while (0) | |
1da177e4 LT |
95 | #else |
96 | #define LIST(x,y) | |
97 | #define REMOVE(w,x,y,z) | |
98 | #endif | |
99 | ||
100 | #ifndef notyet | |
101 | #undef LINKED | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * Design | |
106 | * Issues : | |
107 | * | |
108 | * The other Linux SCSI drivers were written when Linux was Intel PC-only, | |
109 | * and specifically for each board rather than each chip. This makes their | |
110 | * adaptation to platforms like the Mac (Some of which use NCR5380's) | |
111 | * more difficult than it has to be. | |
112 | * | |
113 | * Also, many of the SCSI drivers were written before the command queuing | |
c28bda25 | 114 | * routines were implemented, meaning their implementations of queued |
1da177e4 LT |
115 | * commands were hacked on rather than designed in from the start. |
116 | * | |
c28bda25 | 117 | * When I designed the Linux SCSI drivers I figured that |
1da177e4 LT |
118 | * while having two different SCSI boards in a system might be useful |
119 | * for debugging things, two of the same type wouldn't be used. | |
120 | * Well, I was wrong and a number of users have mailed me about running | |
121 | * multiple high-performance SCSI boards in a server. | |
122 | * | |
c28bda25 | 123 | * Finally, when I get questions from users, I have no idea what |
1da177e4 LT |
124 | * revision of my driver they are running. |
125 | * | |
126 | * This driver attempts to address these problems : | |
c28bda25 | 127 | * This is a generic 5380 driver. To use it on a different platform, |
1da177e4 | 128 | * one simply writes appropriate system specific macros (ie, data |
c28bda25 | 129 | * transfer - some PC's will use the I/O bus, 68K's must use |
1da177e4 LT |
130 | * memory mapped) and drops this file in their 'C' wrapper. |
131 | * | |
c28bda25 | 132 | * As far as command queueing, two queues are maintained for |
1da177e4 | 133 | * each 5380 in the system - commands that haven't been issued yet, |
c28bda25 RZ |
134 | * and commands that are currently executing. This means that an |
135 | * unlimited number of commands may be queued, letting | |
136 | * more commands propagate from the higher driver levels giving higher | |
137 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, | |
138 | * allowing multiple commands to propagate all the way to a SCSI-II device | |
1da177e4 LT |
139 | * while a command is already executing. |
140 | * | |
c28bda25 | 141 | * To solve the multiple-boards-in-the-same-system problem, |
1da177e4 LT |
142 | * there is a separate instance structure for each instance |
143 | * of a 5380 in the system. So, multiple NCR5380 drivers will | |
144 | * be able to coexist with appropriate changes to the high level | |
c28bda25 | 145 | * SCSI code. |
1da177e4 LT |
146 | * |
147 | * A NCR5380_PUBLIC_REVISION macro is provided, with the release | |
c28bda25 RZ |
148 | * number (updated for each public release) printed by the |
149 | * NCR5380_print_options command, which should be called from the | |
1da177e4 LT |
150 | * wrapper detect function, so that I know what release of the driver |
151 | * users are using. | |
152 | * | |
c28bda25 | 153 | * Issues specific to the NCR5380 : |
1da177e4 | 154 | * |
c28bda25 RZ |
155 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
156 | * piece of hardware that requires you to sit in a loop polling for | |
157 | * the REQ signal as long as you are connected. Some devices are | |
158 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect | |
1da177e4 | 159 | * while doing long seek operations. |
c28bda25 | 160 | * |
1da177e4 LT |
161 | * The workaround for this is to keep track of devices that have |
162 | * disconnected. If the device hasn't disconnected, for commands that | |
c28bda25 | 163 | * should disconnect, we do something like |
1da177e4 LT |
164 | * |
165 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } | |
c28bda25 RZ |
166 | * |
167 | * Some tweaking of N and M needs to be done. An algorithm based | |
1da177e4 | 168 | * on "time to data" would give the best results as long as short time |
c28bda25 | 169 | * to datas (ie, on the same track) were considered, however these |
1da177e4 LT |
170 | * broken devices are the exception rather than the rule and I'd rather |
171 | * spend my time optimizing for the normal case. | |
172 | * | |
173 | * Architecture : | |
174 | * | |
175 | * At the heart of the design is a coroutine, NCR5380_main, | |
176 | * which is started when not running by the interrupt handler, | |
177 | * timer, and queue command function. It attempts to establish | |
c28bda25 RZ |
178 | * I_T_L or I_T_L_Q nexuses by removing the commands from the |
179 | * issue queue and calling NCR5380_select() if a nexus | |
180 | * is not established. | |
1da177e4 LT |
181 | * |
182 | * Once a nexus is established, the NCR5380_information_transfer() | |
183 | * phase goes through the various phases as instructed by the target. | |
184 | * if the target goes into MSG IN and sends a DISCONNECT message, | |
185 | * the command structure is placed into the per instance disconnected | |
186 | * queue, and NCR5380_main tries to find more work. If USLEEP | |
187 | * was defined, and the target is idle for too long, the system | |
188 | * will try to sleep. | |
189 | * | |
190 | * If a command has disconnected, eventually an interrupt will trigger, | |
191 | * calling NCR5380_intr() which will in turn call NCR5380_reselect | |
192 | * to reestablish a nexus. This will run main if necessary. | |
193 | * | |
c28bda25 | 194 | * On command termination, the done function will be called as |
1da177e4 LT |
195 | * appropriate. |
196 | * | |
c28bda25 | 197 | * SCSI pointers are maintained in the SCp field of SCSI command |
1da177e4 LT |
198 | * structures, being initialized after the command is connected |
199 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. | |
200 | * Note that in violation of the standard, an implicit SAVE POINTERS operation | |
201 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. | |
202 | */ | |
203 | ||
204 | /* | |
205 | * Using this file : | |
206 | * This file a skeleton Linux SCSI driver for the NCR 5380 series | |
c28bda25 | 207 | * of chips. To use it, you write an architecture specific functions |
1da177e4 LT |
208 | * and macros and include this file in your driver. |
209 | * | |
c28bda25 | 210 | * These macros control options : |
1da177e4 | 211 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
c28bda25 | 212 | * for commands that return with a CHECK CONDITION status. |
1da177e4 LT |
213 | * |
214 | * LINKED - if defined, linked commands are supported. | |
215 | * | |
216 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. | |
217 | * | |
218 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible | |
219 | * | |
220 | * These macros MUST be defined : | |
c28bda25 | 221 | * |
1da177e4 LT |
222 | * NCR5380_read(register) - read from the specified register |
223 | * | |
c28bda25 | 224 | * NCR5380_write(register, value) - write to the specific register |
1da177e4 LT |
225 | * |
226 | * Either real DMA *or* pseudo DMA may be implemented | |
c28bda25 | 227 | * REAL functions : |
1da177e4 | 228 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
c28bda25 | 229 | * Note that the DMA setup functions should return the number of bytes |
1da177e4 LT |
230 | * that they were able to program the controller for. |
231 | * | |
c28bda25 | 232 | * Also note that generic i386/PC versions of these macros are |
1da177e4 LT |
233 | * available as NCR5380_i386_dma_write_setup, |
234 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. | |
235 | * | |
236 | * NCR5380_dma_write_setup(instance, src, count) - initialize | |
237 | * NCR5380_dma_read_setup(instance, dst, count) - initialize | |
238 | * NCR5380_dma_residual(instance); - residual count | |
239 | * | |
240 | * PSEUDO functions : | |
241 | * NCR5380_pwrite(instance, src, count) | |
242 | * NCR5380_pread(instance, dst, count); | |
243 | * | |
244 | * If nothing specific to this implementation needs doing (ie, with external | |
c28bda25 RZ |
245 | * hardware), you must also define |
246 | * | |
1da177e4 LT |
247 | * NCR5380_queue_command |
248 | * NCR5380_reset | |
249 | * NCR5380_abort | |
250 | * NCR5380_proc_info | |
251 | * | |
c28bda25 | 252 | * to be the global entry points into the specific driver, ie |
1da177e4 LT |
253 | * #define NCR5380_queue_command t128_queue_command. |
254 | * | |
255 | * If this is not done, the routines will be defined as static functions | |
256 | * with the NCR5380* names and the user must provide a globally | |
257 | * accessible wrapper function. | |
258 | * | |
259 | * The generic driver is initialized by calling NCR5380_init(instance), | |
c28bda25 | 260 | * after setting the appropriate host specific fields and ID. If the |
1da177e4 LT |
261 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
262 | * possible) function may be used. Before the specific driver initialization | |
263 | * code finishes, NCR5380_print_options should be called. | |
264 | */ | |
265 | ||
266 | static struct Scsi_Host *first_instance = NULL; | |
d0be4a7d | 267 | static struct scsi_host_template *the_template = NULL; |
1da177e4 LT |
268 | |
269 | /* Macros ease life... :-) */ | |
270 | #define SETUP_HOSTDATA(in) \ | |
271 | struct NCR5380_hostdata *hostdata = \ | |
272 | (struct NCR5380_hostdata *)(in)->hostdata | |
273 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) | |
274 | ||
3130d905 RZ |
275 | #define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble) |
276 | #define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next)) | |
277 | #define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble) | |
1da177e4 LT |
278 | |
279 | #define HOSTNO instance->host_no | |
280 | #define H_NO(cmd) (cmd)->device->host->host_no | |
281 | ||
282 | #ifdef SUPPORT_TAGS | |
283 | ||
284 | /* | |
285 | * Functions for handling tagged queuing | |
286 | * ===================================== | |
287 | * | |
288 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: | |
289 | * | |
290 | * Using consecutive numbers for the tags is no good idea in my eyes. There | |
291 | * could be wrong re-usings if the counter (8 bit!) wraps and some early | |
292 | * command has been preempted for a long time. My solution: a bitfield for | |
293 | * remembering used tags. | |
294 | * | |
295 | * There's also the problem that each target has a certain queue size, but we | |
296 | * cannot know it in advance :-( We just see a QUEUE_FULL status being | |
297 | * returned. So, in this case, the driver internal queue size assumption is | |
298 | * reduced to the number of active tags if QUEUE_FULL is returned by the | |
299 | * target. The command is returned to the mid-level, but with status changed | |
300 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL | |
301 | * correctly. | |
302 | * | |
303 | * We're also not allowed running tagged commands as long as an untagged | |
304 | * command is active. And REQUEST SENSE commands after a contingent allegiance | |
305 | * condition _must_ be untagged. To keep track whether an untagged command has | |
306 | * been issued, the host->busy array is still employed, as it is without | |
307 | * support for tagged queuing. | |
308 | * | |
309 | * One could suspect that there are possible race conditions between | |
310 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the | |
311 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), | |
312 | * which already guaranteed to be running at most once. It is also the only | |
313 | * place where tags/LUNs are allocated. So no other allocation can slip | |
314 | * between that pair, there could only happen a reselection, which can free a | |
315 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes | |
316 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. | |
317 | */ | |
318 | ||
319 | /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ | |
320 | #undef TAG_NONE | |
321 | #define TAG_NONE 0xff | |
322 | ||
323 | typedef struct { | |
c28bda25 RZ |
324 | DECLARE_BITMAP(allocated, MAX_TAGS); |
325 | int nr_allocated; | |
326 | int queue_size; | |
1da177e4 LT |
327 | } TAG_ALLOC; |
328 | ||
c28bda25 | 329 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
1da177e4 LT |
330 | |
331 | ||
c28bda25 | 332 | static void __init init_tags(void) |
1da177e4 | 333 | { |
c28bda25 RZ |
334 | int target, lun; |
335 | TAG_ALLOC *ta; | |
336 | ||
337 | if (!setup_use_tagged_queuing) | |
338 | return; | |
339 | ||
340 | for (target = 0; target < 8; ++target) { | |
341 | for (lun = 0; lun < 8; ++lun) { | |
342 | ta = &TagAlloc[target][lun]; | |
343 | bitmap_zero(ta->allocated, MAX_TAGS); | |
344 | ta->nr_allocated = 0; | |
345 | /* At the beginning, assume the maximum queue size we could | |
346 | * support (MAX_TAGS). This value will be decreased if the target | |
347 | * returns QUEUE_FULL status. | |
348 | */ | |
349 | ta->queue_size = MAX_TAGS; | |
350 | } | |
1da177e4 | 351 | } |
1da177e4 LT |
352 | } |
353 | ||
354 | ||
355 | /* Check if we can issue a command to this LUN: First see if the LUN is marked | |
356 | * busy by an untagged command. If the command should use tagged queuing, also | |
357 | * check that there is a free tag and the target's queue won't overflow. This | |
358 | * function should be called with interrupts disabled to avoid race | |
359 | * conditions. | |
c28bda25 | 360 | */ |
1da177e4 | 361 | |
c28bda25 | 362 | static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged) |
1da177e4 | 363 | { |
c28bda25 RZ |
364 | SETUP_HOSTDATA(cmd->device->host); |
365 | ||
366 | if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) | |
367 | return 1; | |
368 | if (!should_be_tagged || | |
369 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) | |
370 | return 0; | |
371 | if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= | |
372 | TagAlloc[cmd->device->id][cmd->device->lun].queue_size) { | |
d65e634a | 373 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d: no free tags\n", |
c28bda25 RZ |
374 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
375 | return 1; | |
376 | } | |
377 | return 0; | |
1da177e4 LT |
378 | } |
379 | ||
380 | ||
381 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() | |
382 | * must be called before!), or reserve the LUN in 'busy' if the command is | |
383 | * untagged. | |
384 | */ | |
385 | ||
c28bda25 | 386 | static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged) |
1da177e4 | 387 | { |
c28bda25 RZ |
388 | SETUP_HOSTDATA(cmd->device->host); |
389 | ||
390 | /* If we or the target don't support tagged queuing, allocate the LUN for | |
391 | * an untagged command. | |
392 | */ | |
393 | if (!should_be_tagged || | |
394 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) { | |
395 | cmd->tag = TAG_NONE; | |
396 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
d65e634a | 397 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d now allocated by untagged " |
c28bda25 RZ |
398 | "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun); |
399 | } else { | |
400 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
401 | ||
402 | cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); | |
403 | set_bit(cmd->tag, ta->allocated); | |
404 | ta->nr_allocated++; | |
d65e634a | 405 | dprintk(NDEBUG_TAGS, "scsi%d: using tag %d for target %d lun %d " |
c28bda25 RZ |
406 | "(now %d tags in use)\n", |
407 | H_NO(cmd), cmd->tag, cmd->device->id, | |
408 | cmd->device->lun, ta->nr_allocated); | |
409 | } | |
1da177e4 LT |
410 | } |
411 | ||
412 | ||
413 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, | |
414 | * unlock the LUN. | |
415 | */ | |
416 | ||
c28bda25 | 417 | static void cmd_free_tag(Scsi_Cmnd *cmd) |
1da177e4 | 418 | { |
c28bda25 RZ |
419 | SETUP_HOSTDATA(cmd->device->host); |
420 | ||
421 | if (cmd->tag == TAG_NONE) { | |
422 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); | |
d65e634a | 423 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d untagged cmd finished\n", |
c28bda25 RZ |
424 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
425 | } else if (cmd->tag >= MAX_TAGS) { | |
426 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", | |
427 | H_NO(cmd), cmd->tag); | |
428 | } else { | |
429 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
430 | clear_bit(cmd->tag, ta->allocated); | |
431 | ta->nr_allocated--; | |
d65e634a | 432 | dprintk(NDEBUG_TAGS, "scsi%d: freed tag %d for target %d lun %d\n", |
c28bda25 RZ |
433 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun); |
434 | } | |
1da177e4 LT |
435 | } |
436 | ||
437 | ||
c28bda25 | 438 | static void free_all_tags(void) |
1da177e4 | 439 | { |
c28bda25 RZ |
440 | int target, lun; |
441 | TAG_ALLOC *ta; | |
442 | ||
443 | if (!setup_use_tagged_queuing) | |
444 | return; | |
445 | ||
446 | for (target = 0; target < 8; ++target) { | |
447 | for (lun = 0; lun < 8; ++lun) { | |
448 | ta = &TagAlloc[target][lun]; | |
449 | bitmap_zero(ta->allocated, MAX_TAGS); | |
450 | ta->nr_allocated = 0; | |
451 | } | |
1da177e4 | 452 | } |
1da177e4 LT |
453 | } |
454 | ||
455 | #endif /* SUPPORT_TAGS */ | |
456 | ||
457 | ||
458 | /* | |
459 | * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) | |
460 | * | |
461 | * Purpose: Try to merge several scatter-gather requests into one DMA | |
462 | * transfer. This is possible if the scatter buffers lie on | |
463 | * physical contiguous addresses. | |
464 | * | |
465 | * Parameters: Scsi_Cmnd *cmd | |
466 | * The command to work on. The first scatter buffer's data are | |
25985edc | 467 | * assumed to be already transferred into ptr/this_residual. |
1da177e4 LT |
468 | */ |
469 | ||
c28bda25 | 470 | static void merge_contiguous_buffers(Scsi_Cmnd *cmd) |
1da177e4 | 471 | { |
c28bda25 | 472 | unsigned long endaddr; |
1da177e4 | 473 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 RZ |
474 | unsigned long oldlen = cmd->SCp.this_residual; |
475 | int cnt = 1; | |
1da177e4 LT |
476 | #endif |
477 | ||
c28bda25 RZ |
478 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
479 | cmd->SCp.buffers_residual && | |
5a1cb47f | 480 | virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) { |
d65e634a | 481 | dprintk(NDEBUG_MERGING, "VTOP(%p) == %08lx -> merging\n", |
5a1cb47f | 482 | page_address(sg_page(&cmd->SCp.buffer[1])), endaddr); |
1da177e4 | 483 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 484 | ++cnt; |
1da177e4 | 485 | #endif |
c28bda25 RZ |
486 | ++cmd->SCp.buffer; |
487 | --cmd->SCp.buffers_residual; | |
488 | cmd->SCp.this_residual += cmd->SCp.buffer->length; | |
489 | endaddr += cmd->SCp.buffer->length; | |
490 | } | |
1da177e4 | 491 | #if (NDEBUG & NDEBUG_MERGING) |
c28bda25 | 492 | if (oldlen != cmd->SCp.this_residual) |
d65e634a | 493 | dprintk(NDEBUG_MERGING, "merged %d buffers from %p, new length %08x\n", |
c28bda25 | 494 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
1da177e4 LT |
495 | #endif |
496 | } | |
497 | ||
498 | /* | |
499 | * Function : void initialize_SCp(Scsi_Cmnd *cmd) | |
500 | * | |
c28bda25 | 501 | * Purpose : initialize the saved data pointers for cmd to point to the |
1da177e4 LT |
502 | * start of the buffer. |
503 | * | |
504 | * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. | |
505 | */ | |
506 | ||
c28bda25 | 507 | static inline void initialize_SCp(Scsi_Cmnd *cmd) |
1da177e4 | 508 | { |
c28bda25 RZ |
509 | /* |
510 | * Initialize the Scsi Pointer field so that all of the commands in the | |
511 | * various queues are valid. | |
1da177e4 | 512 | */ |
c28bda25 | 513 | |
9e0fe44d BH |
514 | if (scsi_bufflen(cmd)) { |
515 | cmd->SCp.buffer = scsi_sglist(cmd); | |
516 | cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; | |
45711f1a | 517 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
518 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
519 | /* ++roman: Try to merge some scatter-buffers if they are at | |
520 | * contiguous physical addresses. | |
521 | */ | |
522 | merge_contiguous_buffers(cmd); | |
523 | } else { | |
524 | cmd->SCp.buffer = NULL; | |
525 | cmd->SCp.buffers_residual = 0; | |
9e0fe44d BH |
526 | cmd->SCp.ptr = NULL; |
527 | cmd->SCp.this_residual = 0; | |
c28bda25 | 528 | } |
1da177e4 LT |
529 | } |
530 | ||
1da177e4 LT |
531 | #include <linux/delay.h> |
532 | ||
533 | #if NDEBUG | |
534 | static struct { | |
c28bda25 RZ |
535 | unsigned char mask; |
536 | const char *name; | |
537 | } signals[] = { | |
538 | { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, | |
539 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, | |
540 | { SR_SEL, "SEL" }, {0, NULL} | |
541 | }, basrs[] = { | |
542 | {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} | |
543 | }, icrs[] = { | |
544 | {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, | |
545 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, | |
546 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, | |
547 | {0, NULL} | |
548 | }, mrs[] = { | |
549 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, | |
550 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, | |
551 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, | |
552 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, | |
553 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, | |
554 | {0, NULL} | |
555 | }; | |
1da177e4 LT |
556 | |
557 | /* | |
558 | * Function : void NCR5380_print(struct Scsi_Host *instance) | |
559 | * | |
560 | * Purpose : print the SCSI bus signals for debugging purposes | |
561 | * | |
562 | * Input : instance - which NCR5380 | |
563 | */ | |
564 | ||
c28bda25 RZ |
565 | static void NCR5380_print(struct Scsi_Host *instance) |
566 | { | |
567 | unsigned char status, data, basr, mr, icr, i; | |
568 | unsigned long flags; | |
569 | ||
570 | local_irq_save(flags); | |
571 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
572 | status = NCR5380_read(STATUS_REG); | |
573 | mr = NCR5380_read(MODE_REG); | |
574 | icr = NCR5380_read(INITIATOR_COMMAND_REG); | |
575 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
576 | local_irq_restore(flags); | |
577 | printk("STATUS_REG: %02x ", status); | |
578 | for (i = 0; signals[i].mask; ++i) | |
579 | if (status & signals[i].mask) | |
580 | printk(",%s", signals[i].name); | |
581 | printk("\nBASR: %02x ", basr); | |
582 | for (i = 0; basrs[i].mask; ++i) | |
583 | if (basr & basrs[i].mask) | |
584 | printk(",%s", basrs[i].name); | |
585 | printk("\nICR: %02x ", icr); | |
586 | for (i = 0; icrs[i].mask; ++i) | |
587 | if (icr & icrs[i].mask) | |
588 | printk(",%s", icrs[i].name); | |
589 | printk("\nMODE: %02x ", mr); | |
590 | for (i = 0; mrs[i].mask; ++i) | |
591 | if (mr & mrs[i].mask) | |
592 | printk(",%s", mrs[i].name); | |
593 | printk("\n"); | |
1da177e4 LT |
594 | } |
595 | ||
596 | static struct { | |
c28bda25 RZ |
597 | unsigned char value; |
598 | const char *name; | |
1da177e4 | 599 | } phases[] = { |
c28bda25 RZ |
600 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
601 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, | |
602 | {PHASE_UNKNOWN, "UNKNOWN"} | |
603 | }; | |
1da177e4 | 604 | |
c28bda25 | 605 | /* |
1da177e4 LT |
606 | * Function : void NCR5380_print_phase(struct Scsi_Host *instance) |
607 | * | |
608 | * Purpose : print the current SCSI phase for debugging purposes | |
609 | * | |
610 | * Input : instance - which NCR5380 | |
611 | */ | |
612 | ||
613 | static void NCR5380_print_phase(struct Scsi_Host *instance) | |
614 | { | |
c28bda25 RZ |
615 | unsigned char status; |
616 | int i; | |
617 | ||
618 | status = NCR5380_read(STATUS_REG); | |
619 | if (!(status & SR_REQ)) | |
620 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); | |
621 | else { | |
622 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && | |
623 | (phases[i].value != (status & PHASE_MASK)); ++i) | |
624 | ; | |
625 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); | |
626 | } | |
1da177e4 LT |
627 | } |
628 | ||
1da177e4 LT |
629 | #endif |
630 | ||
631 | /* | |
632 | * ++roman: New scheme of calling NCR5380_main() | |
c28bda25 | 633 | * |
1da177e4 LT |
634 | * If we're not in an interrupt, we can call our main directly, it cannot be |
635 | * already running. Else, we queue it on a task queue, if not 'main_running' | |
636 | * tells us that a lower level is already executing it. This way, | |
637 | * 'main_running' needs not be protected in a special way. | |
638 | * | |
639 | * queue_main() is a utility function for putting our main onto the task | |
640 | * queue, if main_running is false. It should be called only from a | |
641 | * interrupt or bottom half. | |
642 | */ | |
643 | ||
5a0e3ad6 | 644 | #include <linux/gfp.h> |
1da177e4 LT |
645 | #include <linux/workqueue.h> |
646 | #include <linux/interrupt.h> | |
647 | ||
c28bda25 | 648 | static volatile int main_running; |
b312b38c | 649 | static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); |
1da177e4 | 650 | |
c28bda25 | 651 | static inline void queue_main(void) |
1da177e4 | 652 | { |
c28bda25 RZ |
653 | if (!main_running) { |
654 | /* If in interrupt and NCR5380_main() not already running, | |
655 | queue it on the 'immediate' task queue, to be processed | |
656 | immediately after the current interrupt processing has | |
657 | finished. */ | |
658 | schedule_work(&NCR5380_tqueue); | |
659 | } | |
660 | /* else: nothing to do: the running NCR5380_main() will pick up | |
661 | any newly queued command. */ | |
1da177e4 LT |
662 | } |
663 | ||
664 | ||
c28bda25 | 665 | static inline void NCR5380_all_init(void) |
1da177e4 | 666 | { |
c28bda25 RZ |
667 | static int done = 0; |
668 | if (!done) { | |
d65e634a | 669 | dprintk(NDEBUG_INIT, "scsi : NCR5380_all_init()\n"); |
c28bda25 RZ |
670 | done = 1; |
671 | } | |
1da177e4 LT |
672 | } |
673 | ||
c28bda25 | 674 | |
1da177e4 LT |
675 | /* |
676 | * Function : void NCR58380_print_options (struct Scsi_Host *instance) | |
677 | * | |
678 | * Purpose : called by probe code indicating the NCR5380 driver | |
679 | * options that were selected. | |
680 | * | |
681 | * Inputs : instance, pointer to this instance. Unused. | |
682 | */ | |
683 | ||
c28bda25 | 684 | static void __init NCR5380_print_options(struct Scsi_Host *instance) |
1da177e4 | 685 | { |
c28bda25 RZ |
686 | printk(" generic options" |
687 | #ifdef AUTOSENSE | |
688 | " AUTOSENSE" | |
1da177e4 LT |
689 | #endif |
690 | #ifdef REAL_DMA | |
c28bda25 | 691 | " REAL DMA" |
1da177e4 LT |
692 | #endif |
693 | #ifdef PARITY | |
c28bda25 | 694 | " PARITY" |
1da177e4 LT |
695 | #endif |
696 | #ifdef SUPPORT_TAGS | |
c28bda25 | 697 | " SCSI-2 TAGGED QUEUING" |
1da177e4 | 698 | #endif |
c28bda25 RZ |
699 | ); |
700 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); | |
1da177e4 LT |
701 | } |
702 | ||
703 | /* | |
704 | * Function : void NCR5380_print_status (struct Scsi_Host *instance) | |
705 | * | |
706 | * Purpose : print commands in the various queues, called from | |
707 | * NCR5380_abort and NCR5380_debug to aid debugging. | |
708 | * | |
c28bda25 | 709 | * Inputs : instance, pointer to this instance. |
1da177e4 LT |
710 | */ |
711 | ||
d89537e1 | 712 | static void lprint_Scsi_Cmnd(Scsi_Cmnd *cmd) |
1da177e4 | 713 | { |
d89537e1 AV |
714 | int i, s; |
715 | unsigned char *command; | |
716 | printk("scsi%d: destination target %d, lun %d\n", | |
717 | H_NO(cmd), cmd->device->id, cmd->device->lun); | |
718 | printk(KERN_CONT " command = "); | |
719 | command = cmd->cmnd; | |
720 | printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]); | |
721 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) | |
722 | printk(KERN_CONT " %02x", command[i]); | |
723 | printk("\n"); | |
1da177e4 LT |
724 | } |
725 | ||
d89537e1 | 726 | static void NCR5380_print_status(struct Scsi_Host *instance) |
1da177e4 | 727 | { |
c28bda25 RZ |
728 | struct NCR5380_hostdata *hostdata; |
729 | Scsi_Cmnd *ptr; | |
730 | unsigned long flags; | |
d89537e1 | 731 | |
8ad3a593 FT |
732 | NCR5380_dprint(NDEBUG_ANY, instance); |
733 | NCR5380_dprint_phase(NDEBUG_ANY, instance); | |
c28bda25 RZ |
734 | |
735 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
736 | ||
d89537e1 | 737 | printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); |
c28bda25 | 738 | local_irq_save(flags); |
d89537e1 | 739 | printk("NCR5380: coroutine is%s running.\n", |
c28bda25 | 740 | main_running ? "" : "n't"); |
c28bda25 | 741 | if (!hostdata->connected) |
d89537e1 | 742 | printk("scsi%d: no currently connected command\n", HOSTNO); |
c28bda25 | 743 | else |
d89537e1 AV |
744 | lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected); |
745 | printk("scsi%d: issue_queue\n", HOSTNO); | |
746 | for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) | |
747 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 748 | |
d89537e1 | 749 | printk("scsi%d: disconnected_queue\n", HOSTNO); |
c28bda25 | 750 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; |
d89537e1 AV |
751 | ptr = NEXT(ptr)) |
752 | lprint_Scsi_Cmnd(ptr); | |
1da177e4 | 753 | |
c28bda25 | 754 | local_irq_restore(flags); |
d89537e1 | 755 | printk("\n"); |
1da177e4 LT |
756 | } |
757 | ||
d89537e1 | 758 | static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m) |
1da177e4 | 759 | { |
c28bda25 RZ |
760 | int i, s; |
761 | unsigned char *command; | |
d89537e1 | 762 | seq_printf(m, "scsi%d: destination target %d, lun %d\n", |
c28bda25 | 763 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
d89537e1 | 764 | seq_printf(m, " command = "); |
c28bda25 | 765 | command = cmd->cmnd; |
d89537e1 | 766 | seq_printf(m, "%2d (0x%02x)", command[0], command[0]); |
c28bda25 | 767 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
d89537e1 AV |
768 | seq_printf(m, " %02x", command[i]); |
769 | seq_printf(m, "\n"); | |
1da177e4 LT |
770 | } |
771 | ||
d89537e1 AV |
772 | static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance) |
773 | { | |
774 | struct NCR5380_hostdata *hostdata; | |
775 | Scsi_Cmnd *ptr; | |
776 | unsigned long flags; | |
777 | ||
778 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; | |
779 | ||
780 | seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); | |
781 | local_irq_save(flags); | |
782 | seq_printf(m, "NCR5380: coroutine is%s running.\n", | |
783 | main_running ? "" : "n't"); | |
784 | if (!hostdata->connected) | |
785 | seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO); | |
786 | else | |
787 | show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m); | |
788 | seq_printf(m, "scsi%d: issue_queue\n", HOSTNO); | |
789 | for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) | |
790 | show_Scsi_Cmnd(ptr, m); | |
791 | ||
792 | seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO); | |
793 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; | |
794 | ptr = NEXT(ptr)) | |
795 | show_Scsi_Cmnd(ptr, m); | |
796 | ||
797 | local_irq_restore(flags); | |
798 | return 0; | |
799 | } | |
1da177e4 | 800 | |
c28bda25 | 801 | /* |
1da177e4 LT |
802 | * Function : void NCR5380_init (struct Scsi_Host *instance) |
803 | * | |
804 | * Purpose : initializes *instance and corresponding 5380 chip. | |
805 | * | |
c28bda25 | 806 | * Inputs : instance - instantiation of the 5380 driver. |
1da177e4 LT |
807 | * |
808 | * Notes : I assume that the host, hostno, and id bits have been | |
c28bda25 RZ |
809 | * set correctly. I don't care about the irq and other fields. |
810 | * | |
1da177e4 LT |
811 | */ |
812 | ||
95fde7a8 | 813 | static int __init NCR5380_init(struct Scsi_Host *instance, int flags) |
1da177e4 | 814 | { |
c28bda25 RZ |
815 | int i; |
816 | SETUP_HOSTDATA(instance); | |
817 | ||
818 | NCR5380_all_init(); | |
819 | ||
820 | hostdata->aborted = 0; | |
821 | hostdata->id_mask = 1 << instance->this_id; | |
822 | hostdata->id_higher_mask = 0; | |
823 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) | |
824 | if (i > hostdata->id_mask) | |
825 | hostdata->id_higher_mask |= i; | |
826 | for (i = 0; i < 8; ++i) | |
827 | hostdata->busy[i] = 0; | |
1da177e4 | 828 | #ifdef SUPPORT_TAGS |
c28bda25 | 829 | init_tags(); |
1da177e4 LT |
830 | #endif |
831 | #if defined (REAL_DMA) | |
c28bda25 | 832 | hostdata->dma_len = 0; |
1da177e4 | 833 | #endif |
c28bda25 RZ |
834 | hostdata->targets_present = 0; |
835 | hostdata->connected = NULL; | |
836 | hostdata->issue_queue = NULL; | |
837 | hostdata->disconnected_queue = NULL; | |
838 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; | |
839 | ||
840 | if (!the_template) { | |
841 | the_template = instance->hostt; | |
842 | first_instance = instance; | |
843 | } | |
1da177e4 LT |
844 | |
845 | #ifndef AUTOSENSE | |
c28bda25 RZ |
846 | if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) |
847 | printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" | |
848 | " without AUTOSENSE option, contingent allegiance conditions may\n" | |
849 | " be incorrectly cleared.\n", HOSTNO); | |
1da177e4 LT |
850 | #endif /* def AUTOSENSE */ |
851 | ||
c28bda25 RZ |
852 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
853 | NCR5380_write(MODE_REG, MR_BASE); | |
854 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
855 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 856 | |
c28bda25 | 857 | return 0; |
1da177e4 LT |
858 | } |
859 | ||
6323e4fe GU |
860 | static void NCR5380_exit(struct Scsi_Host *instance) |
861 | { | |
862 | /* Empty, as we didn't schedule any delayed work */ | |
863 | } | |
864 | ||
c28bda25 RZ |
865 | /* |
866 | * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, | |
867 | * void (*done)(Scsi_Cmnd *)) | |
1da177e4 LT |
868 | * |
869 | * Purpose : enqueues a SCSI command | |
870 | * | |
871 | * Inputs : cmd - SCSI command, done - function called on completion, with | |
872 | * a pointer to the command descriptor. | |
c28bda25 | 873 | * |
1da177e4 LT |
874 | * Returns : 0 |
875 | * | |
c28bda25 RZ |
876 | * Side effects : |
877 | * cmd is added to the per instance issue_queue, with minor | |
878 | * twiddling done to the host specific fields of cmd. If the | |
1da177e4 LT |
879 | * main coroutine is not running, it is restarted. |
880 | * | |
881 | */ | |
882 | ||
f281233d | 883 | static int NCR5380_queue_command_lck(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) |
1da177e4 | 884 | { |
c28bda25 RZ |
885 | SETUP_HOSTDATA(cmd->device->host); |
886 | 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 | ||
1da177e4 LT |
901 | #ifdef NCR5380_STATS |
902 | # if 0 | |
c28bda25 RZ |
903 | if (!hostdata->connected && !hostdata->issue_queue && |
904 | !hostdata->disconnected_queue) { | |
905 | hostdata->timebase = jiffies; | |
906 | } | |
1da177e4 LT |
907 | # endif |
908 | # ifdef NCR5380_STAT_LIMIT | |
9e0fe44d | 909 | if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT) |
1da177e4 | 910 | # endif |
c28bda25 RZ |
911 | switch (cmd->cmnd[0]) { |
912 | case WRITE: | |
913 | case WRITE_6: | |
914 | case WRITE_10: | |
915 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); | |
9e0fe44d | 916 | hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); |
c28bda25 RZ |
917 | hostdata->pendingw++; |
918 | break; | |
919 | case READ: | |
920 | case READ_6: | |
921 | case READ_10: | |
922 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); | |
9e0fe44d | 923 | hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); |
c28bda25 RZ |
924 | hostdata->pendingr++; |
925 | break; | |
926 | } | |
1da177e4 LT |
927 | #endif |
928 | ||
c28bda25 RZ |
929 | /* |
930 | * We use the host_scribble field as a pointer to the next command | |
931 | * in a queue | |
932 | */ | |
933 | ||
3130d905 | 934 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
935 | cmd->scsi_done = done; |
936 | ||
937 | cmd->result = 0; | |
938 | ||
939 | /* | |
940 | * Insert the cmd into the issue queue. Note that REQUEST SENSE | |
941 | * commands are added to the head of the queue since any command will | |
942 | * clear the contingent allegiance condition that exists and the | |
943 | * sense data is only guaranteed to be valid while the condition exists. | |
944 | */ | |
945 | ||
946 | local_irq_save(flags); | |
947 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. | |
948 | * Otherwise a running NCR5380_main may steal the lock. | |
949 | * Lock before actually inserting due to fairness reasons explained in | |
950 | * atari_scsi.c. If we insert first, then it's impossible for this driver | |
951 | * to release the lock. | |
952 | * Stop timer for this command while waiting for the lock, or timeouts | |
953 | * may happen (and they really do), and it's no good if the command doesn't | |
954 | * appear in any of the queues. | |
955 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
956 | * because also a timer int can trigger an abort or reset, which would | |
957 | * alter queues and touch the lock. | |
958 | */ | |
959 | if (!IS_A_TT()) { | |
8ce7955a | 960 | /* perhaps stop command timer here */ |
c28bda25 | 961 | falcon_get_lock(); |
8ce7955a | 962 | /* perhaps restart command timer here */ |
c28bda25 RZ |
963 | } |
964 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { | |
965 | LIST(cmd, hostdata->issue_queue); | |
3130d905 | 966 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
967 | hostdata->issue_queue = cmd; |
968 | } else { | |
969 | for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; | |
970 | NEXT(tmp); tmp = NEXT(tmp)) | |
971 | ; | |
972 | LIST(cmd, tmp); | |
3130d905 | 973 | SET_NEXT(tmp, cmd); |
c28bda25 RZ |
974 | } |
975 | local_irq_restore(flags); | |
976 | ||
d65e634a | 977 | dprintk(NDEBUG_QUEUES, "scsi%d: command added to %s of queue\n", H_NO(cmd), |
c28bda25 RZ |
978 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
979 | ||
980 | /* If queue_command() is called from an interrupt (real one or bottom | |
981 | * half), we let queue_main() do the job of taking care about main. If it | |
982 | * is already running, this is a no-op, else main will be queued. | |
983 | * | |
984 | * If we're not in an interrupt, we can call NCR5380_main() | |
985 | * unconditionally, because it cannot be already running. | |
986 | */ | |
987 | if (in_interrupt() || ((flags >> 8) & 7) >= 6) | |
988 | queue_main(); | |
989 | else | |
990 | NCR5380_main(NULL); | |
991 | return 0; | |
1da177e4 LT |
992 | } |
993 | ||
f281233d JG |
994 | static DEF_SCSI_QCMD(NCR5380_queue_command) |
995 | ||
1da177e4 | 996 | /* |
c28bda25 | 997 | * Function : NCR5380_main (void) |
1da177e4 | 998 | * |
c28bda25 RZ |
999 | * Purpose : NCR5380_main is a coroutine that runs as long as more work can |
1000 | * be done on the NCR5380 host adapters in a system. Both | |
1001 | * NCR5380_queue_command() and NCR5380_intr() will try to start it | |
1da177e4 | 1002 | * in case it is not running. |
c28bda25 RZ |
1003 | * |
1004 | * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should | |
1da177e4 | 1005 | * reenable them. This prevents reentrancy and kernel stack overflow. |
c28bda25 RZ |
1006 | */ |
1007 | ||
b312b38c | 1008 | static void NCR5380_main(struct work_struct *work) |
1da177e4 | 1009 | { |
c28bda25 RZ |
1010 | Scsi_Cmnd *tmp, *prev; |
1011 | struct Scsi_Host *instance = first_instance; | |
1012 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); | |
1013 | int done; | |
1014 | unsigned long flags; | |
1015 | ||
1016 | /* | |
1017 | * We run (with interrupts disabled) until we're sure that none of | |
1018 | * the host adapters have anything that can be done, at which point | |
1019 | * we set main_running to 0 and exit. | |
1020 | * | |
1021 | * Interrupts are enabled before doing various other internal | |
1022 | * instructions, after we've decided that we need to run through | |
1023 | * the loop again. | |
1024 | * | |
1025 | * this should prevent any race conditions. | |
1026 | * | |
1027 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, | |
1028 | * because also a timer int can trigger an abort or reset, which can | |
1029 | * alter queues and touch the Falcon lock. | |
1030 | */ | |
1031 | ||
1032 | /* Tell int handlers main() is now already executing. Note that | |
1033 | no races are possible here. If an int comes in before | |
1034 | 'main_running' is set here, and queues/executes main via the | |
1035 | task queue, it doesn't do any harm, just this instance of main | |
1036 | won't find any work left to do. */ | |
1037 | if (main_running) | |
1038 | return; | |
1039 | main_running = 1; | |
1040 | ||
1041 | local_save_flags(flags); | |
1042 | do { | |
1043 | local_irq_disable(); /* Freeze request queues */ | |
1044 | done = 1; | |
1045 | ||
1046 | if (!hostdata->connected) { | |
d65e634a | 1047 | dprintk(NDEBUG_MAIN, "scsi%d: not connected\n", HOSTNO); |
c28bda25 RZ |
1048 | /* |
1049 | * Search through the issue_queue for a command destined | |
1050 | * for a target that's not busy. | |
1051 | */ | |
1da177e4 | 1052 | #if (NDEBUG & NDEBUG_LISTS) |
c28bda25 RZ |
1053 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; |
1054 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) | |
1055 | ; | |
1056 | /*printk("%p ", tmp);*/ | |
1057 | if ((tmp == prev) && tmp) | |
1058 | printk(" LOOP\n"); | |
1059 | /* else printk("\n"); */ | |
1da177e4 | 1060 | #endif |
c28bda25 RZ |
1061 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, |
1062 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { | |
1da177e4 LT |
1063 | |
1064 | #if (NDEBUG & NDEBUG_LISTS) | |
c28bda25 RZ |
1065 | if (prev != tmp) |
1066 | printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", | |
1067 | tmp, tmp->device->id, hostdata->busy[tmp->device->id], | |
1068 | tmp->device->lun); | |
1da177e4 | 1069 | #endif |
c28bda25 RZ |
1070 | /* When we find one, remove it from the issue queue. */ |
1071 | /* ++guenther: possible race with Falcon locking */ | |
1072 | if ( | |
1da177e4 | 1073 | #ifdef SUPPORT_TAGS |
c28bda25 | 1074 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
1da177e4 | 1075 | #else |
c28bda25 | 1076 | !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) |
1da177e4 | 1077 | #endif |
c28bda25 RZ |
1078 | ) { |
1079 | /* ++guenther: just to be sure, this must be atomic */ | |
1080 | local_irq_disable(); | |
1081 | if (prev) { | |
1082 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 1083 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
1084 | } else { |
1085 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); | |
1086 | hostdata->issue_queue = NEXT(tmp); | |
1087 | } | |
3130d905 | 1088 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
1089 | falcon_dont_release++; |
1090 | ||
1091 | /* reenable interrupts after finding one */ | |
1092 | local_irq_restore(flags); | |
1093 | ||
1094 | /* | |
1095 | * Attempt to establish an I_T_L nexus here. | |
1096 | * On success, instance->hostdata->connected is set. | |
1097 | * On failure, we must add the command back to the | |
1098 | * issue queue so we can keep trying. | |
1099 | */ | |
d65e634a | 1100 | dprintk(NDEBUG_MAIN, "scsi%d: main(): command for target %d " |
c28bda25 RZ |
1101 | "lun %d removed from issue_queue\n", |
1102 | HOSTNO, tmp->device->id, tmp->device->lun); | |
1103 | /* | |
1104 | * REQUEST SENSE commands are issued without tagged | |
1105 | * queueing, even on SCSI-II devices because the | |
1106 | * contingent allegiance condition exists for the | |
1107 | * entire unit. | |
1108 | */ | |
1109 | /* ++roman: ...and the standard also requires that | |
1110 | * REQUEST SENSE command are untagged. | |
1111 | */ | |
1112 | ||
1da177e4 | 1113 | #ifdef SUPPORT_TAGS |
c28bda25 | 1114 | cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); |
1da177e4 | 1115 | #endif |
c28bda25 RZ |
1116 | if (!NCR5380_select(instance, tmp, |
1117 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : | |
1118 | TAG_NEXT)) { | |
1119 | falcon_dont_release--; | |
1120 | /* release if target did not response! */ | |
1121 | falcon_release_lock_if_possible(hostdata); | |
1122 | break; | |
1123 | } else { | |
1124 | local_irq_disable(); | |
1125 | LIST(tmp, hostdata->issue_queue); | |
3130d905 | 1126 | SET_NEXT(tmp, hostdata->issue_queue); |
c28bda25 | 1127 | hostdata->issue_queue = tmp; |
1da177e4 | 1128 | #ifdef SUPPORT_TAGS |
c28bda25 | 1129 | cmd_free_tag(tmp); |
1da177e4 | 1130 | #endif |
c28bda25 RZ |
1131 | falcon_dont_release--; |
1132 | local_irq_restore(flags); | |
d65e634a | 1133 | dprintk(NDEBUG_MAIN, "scsi%d: main(): select() failed, " |
c28bda25 RZ |
1134 | "returned to issue_queue\n", HOSTNO); |
1135 | if (hostdata->connected) | |
1136 | break; | |
1137 | } | |
1138 | } /* if target/lun/target queue is not busy */ | |
1139 | } /* for issue_queue */ | |
1140 | } /* if (!hostdata->connected) */ | |
1141 | ||
1142 | if (hostdata->connected | |
1da177e4 | 1143 | #ifdef REAL_DMA |
c28bda25 | 1144 | && !hostdata->dma_len |
1da177e4 | 1145 | #endif |
c28bda25 RZ |
1146 | ) { |
1147 | local_irq_restore(flags); | |
d65e634a | 1148 | dprintk(NDEBUG_MAIN, "scsi%d: main: performing information transfer\n", |
c28bda25 RZ |
1149 | HOSTNO); |
1150 | NCR5380_information_transfer(instance); | |
d65e634a | 1151 | dprintk(NDEBUG_MAIN, "scsi%d: main: done set false\n", HOSTNO); |
c28bda25 RZ |
1152 | done = 0; |
1153 | } | |
1154 | } while (!done); | |
1da177e4 | 1155 | |
c28bda25 RZ |
1156 | /* Better allow ints _after_ 'main_running' has been cleared, else |
1157 | an interrupt could believe we'll pick up the work it left for | |
1158 | us, but we won't see it anymore here... */ | |
1159 | main_running = 0; | |
1160 | local_irq_restore(flags); | |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | ||
1164 | #ifdef REAL_DMA | |
1165 | /* | |
1166 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) | |
1167 | * | |
1168 | * Purpose : Called by interrupt handler when DMA finishes or a phase | |
c28bda25 | 1169 | * mismatch occurs (which would finish the DMA transfer). |
1da177e4 LT |
1170 | * |
1171 | * Inputs : instance - this instance of the NCR5380. | |
1172 | * | |
1173 | */ | |
1174 | ||
c28bda25 | 1175 | static void NCR5380_dma_complete(struct Scsi_Host *instance) |
1da177e4 | 1176 | { |
c28bda25 RZ |
1177 | SETUP_HOSTDATA(instance); |
1178 | int transfered, saved_data = 0, overrun = 0, cnt, toPIO; | |
1179 | unsigned char **data, p; | |
1180 | volatile int *count; | |
1181 | ||
1182 | if (!hostdata->connected) { | |
1183 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " | |
1184 | "no connected cmd\n", HOSTNO); | |
1185 | return; | |
1da177e4 | 1186 | } |
c28bda25 RZ |
1187 | |
1188 | if (atari_read_overruns) { | |
1189 | p = hostdata->connected->SCp.phase; | |
1190 | if (p & SR_IO) { | |
1191 | udelay(10); | |
1192 | if ((NCR5380_read(BUS_AND_STATUS_REG) & | |
1193 | (BASR_PHASE_MATCH|BASR_ACK)) == | |
1194 | (BASR_PHASE_MATCH|BASR_ACK)) { | |
1195 | saved_data = NCR5380_read(INPUT_DATA_REG); | |
1196 | overrun = 1; | |
d65e634a | 1197 | dprintk(NDEBUG_DMA, "scsi%d: read overrun handled\n", HOSTNO); |
c28bda25 RZ |
1198 | } |
1199 | } | |
1200 | } | |
1201 | ||
d65e634a | 1202 | dprintk(NDEBUG_DMA, "scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
c28bda25 RZ |
1203 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
1204 | NCR5380_read(STATUS_REG)); | |
1205 | ||
1206 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1207 | NCR5380_write(MODE_REG, MR_BASE); | |
1208 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1209 | ||
1210 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); | |
1211 | hostdata->dma_len = 0; | |
1212 | ||
1213 | data = (unsigned char **)&hostdata->connected->SCp.ptr; | |
1214 | count = &hostdata->connected->SCp.this_residual; | |
1215 | *data += transfered; | |
1216 | *count -= transfered; | |
1217 | ||
1218 | if (atari_read_overruns) { | |
1219 | if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { | |
1220 | cnt = toPIO = atari_read_overruns; | |
1221 | if (overrun) { | |
d65e634a | 1222 | dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); |
c28bda25 RZ |
1223 | *(*data)++ = saved_data; |
1224 | (*count)--; | |
1225 | cnt--; | |
1226 | toPIO--; | |
1227 | } | |
d65e634a | 1228 | dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); |
c28bda25 RZ |
1229 | NCR5380_transfer_pio(instance, &p, &cnt, data); |
1230 | *count -= toPIO - cnt; | |
1231 | } | |
1da177e4 | 1232 | } |
1da177e4 LT |
1233 | } |
1234 | #endif /* REAL_DMA */ | |
1235 | ||
1236 | ||
1237 | /* | |
1238 | * Function : void NCR5380_intr (int irq) | |
c28bda25 | 1239 | * |
1da177e4 | 1240 | * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
c28bda25 | 1241 | * from the disconnected queue, and restarting NCR5380_main() |
1da177e4 LT |
1242 | * as required. |
1243 | * | |
1244 | * Inputs : int irq, irq that caused this interrupt. | |
1245 | * | |
1246 | */ | |
1247 | ||
c28bda25 | 1248 | static irqreturn_t NCR5380_intr(int irq, void *dev_id) |
1da177e4 | 1249 | { |
c28bda25 RZ |
1250 | struct Scsi_Host *instance = first_instance; |
1251 | int done = 1, handled = 0; | |
1252 | unsigned char basr; | |
1253 | ||
d65e634a | 1254 | dprintk(NDEBUG_INTR, "scsi%d: NCR5380 irq triggered\n", HOSTNO); |
c28bda25 RZ |
1255 | |
1256 | /* Look for pending interrupts */ | |
1257 | basr = NCR5380_read(BUS_AND_STATUS_REG); | |
d65e634a | 1258 | dprintk(NDEBUG_INTR, "scsi%d: BASR=%02x\n", HOSTNO, basr); |
c28bda25 RZ |
1259 | /* dispatch to appropriate routine if found and done=0 */ |
1260 | if (basr & BASR_IRQ) { | |
8ad3a593 | 1261 | NCR5380_dprint(NDEBUG_INTR, instance); |
c28bda25 RZ |
1262 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
1263 | done = 0; | |
1264 | ENABLE_IRQ(); | |
d65e634a | 1265 | dprintk(NDEBUG_INTR, "scsi%d: SEL interrupt\n", HOSTNO); |
c28bda25 RZ |
1266 | NCR5380_reselect(instance); |
1267 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1268 | } else if (basr & BASR_PARITY_ERROR) { | |
d65e634a | 1269 | dprintk(NDEBUG_INTR, "scsi%d: PARITY interrupt\n", HOSTNO); |
c28bda25 RZ |
1270 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1271 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { | |
d65e634a | 1272 | dprintk(NDEBUG_INTR, "scsi%d: RESET interrupt\n", HOSTNO); |
c28bda25 RZ |
1273 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
1274 | } else { | |
1275 | /* | |
1276 | * The rest of the interrupt conditions can occur only during a | |
1277 | * DMA transfer | |
1278 | */ | |
1da177e4 LT |
1279 | |
1280 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1281 | /* |
1282 | * We should only get PHASE MISMATCH and EOP interrupts if we have | |
1283 | * DMA enabled, so do a sanity check based on the current setting | |
1284 | * of the MODE register. | |
1285 | */ | |
1286 | ||
1287 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && | |
1288 | ((basr & BASR_END_DMA_TRANSFER) || | |
1289 | !(basr & BASR_PHASE_MATCH))) { | |
1290 | ||
d65e634a | 1291 | dprintk(NDEBUG_INTR, "scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
c28bda25 RZ |
1292 | NCR5380_dma_complete( instance ); |
1293 | done = 0; | |
1294 | ENABLE_IRQ(); | |
1295 | } else | |
1da177e4 | 1296 | #endif /* REAL_DMA */ |
c28bda25 | 1297 | { |
1da177e4 | 1298 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
c28bda25 RZ |
1299 | if (basr & BASR_PHASE_MATCH) |
1300 | printk(KERN_NOTICE "scsi%d: unknown interrupt, " | |
1301 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", | |
1302 | HOSTNO, basr, NCR5380_read(MODE_REG), | |
1303 | NCR5380_read(STATUS_REG)); | |
1304 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1305 | } | |
1306 | } /* if !(SELECTION || PARITY) */ | |
1307 | handled = 1; | |
1308 | } /* BASR & IRQ */ else { | |
1309 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " | |
1310 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, | |
1311 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); | |
1312 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
1313 | } | |
1314 | ||
1315 | if (!done) { | |
d65e634a | 1316 | dprintk(NDEBUG_INTR, "scsi%d: in int routine, calling main\n", HOSTNO); |
c28bda25 RZ |
1317 | /* Put a call to NCR5380_main() on the queue... */ |
1318 | queue_main(); | |
1319 | } | |
1320 | return IRQ_RETVAL(handled); | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | #ifdef NCR5380_STATS | |
c28bda25 | 1324 | static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd) |
1da177e4 LT |
1325 | { |
1326 | # ifdef NCR5380_STAT_LIMIT | |
9e0fe44d | 1327 | if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT) |
1da177e4 | 1328 | # endif |
c28bda25 RZ |
1329 | switch (cmd->cmnd[0]) { |
1330 | case WRITE: | |
1331 | case WRITE_6: | |
1332 | case WRITE_10: | |
1333 | hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); | |
9e0fe44d | 1334 | /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/ |
c28bda25 RZ |
1335 | hostdata->pendingw--; |
1336 | break; | |
1337 | case READ: | |
1338 | case READ_6: | |
1339 | case READ_10: | |
1340 | hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); | |
9e0fe44d | 1341 | /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/ |
c28bda25 RZ |
1342 | hostdata->pendingr--; |
1343 | break; | |
1344 | } | |
1da177e4 LT |
1345 | } |
1346 | #endif | |
1347 | ||
c28bda25 RZ |
1348 | /* |
1349 | * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, | |
1da177e4 LT |
1350 | * int tag); |
1351 | * | |
1352 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, | |
c28bda25 RZ |
1353 | * including ARBITRATION, SELECTION, and initial message out for |
1354 | * IDENTIFY and queue messages. | |
1da177e4 | 1355 | * |
c28bda25 RZ |
1356 | * Inputs : instance - instantiation of the 5380 driver on which this |
1357 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for | |
1358 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for | |
1da177e4 | 1359 | * the command that is presently connected. |
c28bda25 | 1360 | * |
1da177e4 | 1361 | * Returns : -1 if selection could not execute for some reason, |
c28bda25 RZ |
1362 | * 0 if selection succeeded or failed because the target |
1363 | * did not respond. | |
1da177e4 | 1364 | * |
c28bda25 RZ |
1365 | * Side effects : |
1366 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit | |
1da177e4 LT |
1367 | * with registers as they should have been on entry - ie |
1368 | * SELECT_ENABLE will be set appropriately, the NCR5380 | |
1369 | * will cease to drive any SCSI bus signals. | |
1370 | * | |
c28bda25 RZ |
1371 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
1372 | * instance->connected will be set to cmd. | |
1373 | * SELECT interrupt will be disabled. | |
1da177e4 | 1374 | * |
c28bda25 | 1375 | * If failed (no target) : cmd->scsi_done() will be called, and the |
1da177e4 LT |
1376 | * cmd->result host byte set to DID_BAD_TARGET. |
1377 | */ | |
1378 | ||
c28bda25 | 1379 | static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag) |
1da177e4 | 1380 | { |
c28bda25 RZ |
1381 | SETUP_HOSTDATA(instance); |
1382 | unsigned char tmp[3], phase; | |
1383 | unsigned char *data; | |
1384 | int len; | |
1385 | unsigned long timeout; | |
1386 | unsigned long flags; | |
1387 | ||
1388 | hostdata->restart_select = 0; | |
8ad3a593 | 1389 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
d65e634a | 1390 | dprintk(NDEBUG_ARBITRATION, "scsi%d: starting arbitration, id = %d\n", HOSTNO, |
c28bda25 RZ |
1391 | instance->this_id); |
1392 | ||
1393 | /* | |
1394 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the | |
1395 | * data bus during SELECTION. | |
1396 | */ | |
1397 | ||
1398 | local_irq_save(flags); | |
1399 | if (hostdata->connected) { | |
1400 | local_irq_restore(flags); | |
1401 | return -1; | |
1402 | } | |
1403 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
1da177e4 | 1404 | |
c28bda25 RZ |
1405 | /* |
1406 | * Start arbitration. | |
1407 | */ | |
1da177e4 | 1408 | |
c28bda25 RZ |
1409 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
1410 | NCR5380_write(MODE_REG, MR_ARBITRATE); | |
1da177e4 | 1411 | |
c28bda25 | 1412 | local_irq_restore(flags); |
1da177e4 | 1413 | |
c28bda25 | 1414 | /* Wait for arbitration logic to complete */ |
fb810d12 | 1415 | #if defined(NCR_TIMEOUT) |
c28bda25 RZ |
1416 | { |
1417 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; | |
1418 | ||
1419 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && | |
1420 | time_before(jiffies, timeout) && !hostdata->connected) | |
1421 | ; | |
1422 | if (time_after_eq(jiffies, timeout)) { | |
1423 | printk("scsi : arbitration timeout at %d\n", __LINE__); | |
1424 | NCR5380_write(MODE_REG, MR_BASE); | |
1425 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1426 | return -1; | |
1427 | } | |
1428 | } | |
1da177e4 | 1429 | #else /* NCR_TIMEOUT */ |
c28bda25 RZ |
1430 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && |
1431 | !hostdata->connected) | |
1432 | ; | |
1da177e4 LT |
1433 | #endif |
1434 | ||
d65e634a | 1435 | dprintk(NDEBUG_ARBITRATION, "scsi%d: arbitration complete\n", HOSTNO); |
c28bda25 RZ |
1436 | |
1437 | if (hostdata->connected) { | |
1438 | NCR5380_write(MODE_REG, MR_BASE); | |
1439 | return -1; | |
1440 | } | |
1441 | /* | |
1442 | * The arbitration delay is 2.2us, but this is a minimum and there is | |
1443 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate | |
1444 | * the integral nature of udelay(). | |
1445 | * | |
1446 | */ | |
1447 | ||
1448 | udelay(3); | |
1449 | ||
1450 | /* Check for lost arbitration */ | |
1451 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1452 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || | |
1453 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1454 | hostdata->connected) { | |
1455 | NCR5380_write(MODE_REG, MR_BASE); | |
d65e634a | 1456 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
c28bda25 RZ |
1457 | HOSTNO); |
1458 | return -1; | |
1459 | } | |
1da177e4 | 1460 | |
c28bda25 RZ |
1461 | /* after/during arbitration, BSY should be asserted. |
1462 | IBM DPES-31080 Version S31Q works now */ | |
1463 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ | |
1464 | NCR5380_write(INITIATOR_COMMAND_REG, | |
1465 | ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); | |
1466 | ||
1467 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || | |
1468 | hostdata->connected) { | |
1469 | NCR5380_write(MODE_REG, MR_BASE); | |
1470 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
d65e634a | 1471 | dprintk(NDEBUG_ARBITRATION, "scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
c28bda25 RZ |
1472 | HOSTNO); |
1473 | return -1; | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * Again, bus clear + bus settle time is 1.2us, however, this is | |
1478 | * a minimum so we'll udelay ceil(1.2) | |
1479 | */ | |
1da177e4 LT |
1480 | |
1481 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY | |
c28bda25 RZ |
1482 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ |
1483 | udelay(15); | |
1da177e4 | 1484 | #else |
c28bda25 | 1485 | udelay(2); |
1da177e4 | 1486 | #endif |
c28bda25 RZ |
1487 | |
1488 | if (hostdata->connected) { | |
1489 | NCR5380_write(MODE_REG, MR_BASE); | |
1490 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1491 | return -1; | |
1492 | } | |
1493 | ||
d65e634a | 1494 | dprintk(NDEBUG_ARBITRATION, "scsi%d: won arbitration\n", HOSTNO); |
c28bda25 RZ |
1495 | |
1496 | /* | |
1497 | * Now that we have won arbitration, start Selection process, asserting | |
1498 | * the host and target ID's on the SCSI bus. | |
1499 | */ | |
1500 | ||
1501 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); | |
1502 | ||
1503 | /* | |
1504 | * Raise ATN while SEL is true before BSY goes false from arbitration, | |
1505 | * since this is the only way to guarantee that we'll get a MESSAGE OUT | |
1506 | * phase immediately after selection. | |
1507 | */ | |
1508 | ||
1509 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | | |
1510 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); | |
1da177e4 | 1511 | NCR5380_write(MODE_REG, MR_BASE); |
1da177e4 | 1512 | |
c28bda25 RZ |
1513 | /* |
1514 | * Reselect interrupts must be turned off prior to the dropping of BSY, | |
1515 | * otherwise we will trigger an interrupt. | |
1516 | */ | |
1517 | ||
1518 | if (hostdata->connected) { | |
1519 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1520 | return -1; | |
1521 | } | |
1522 | ||
1523 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
1da177e4 | 1524 | |
c28bda25 RZ |
1525 | /* |
1526 | * The initiator shall then wait at least two deskew delays and release | |
1527 | * the BSY signal. | |
1528 | */ | |
1529 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ | |
1530 | ||
1531 | /* Reset BSY */ | |
1532 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | | |
1533 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); | |
1534 | ||
1535 | /* | |
1536 | * Something weird happens when we cease to drive BSY - looks | |
1537 | * like the board/chip is letting us do another read before the | |
1538 | * appropriate propagation delay has expired, and we're confusing | |
1539 | * a BSY signal from ourselves as the target's response to SELECTION. | |
1540 | * | |
1541 | * A small delay (the 'C++' frontend breaks the pipeline with an | |
1542 | * unnecessary jump, making it work on my 386-33/Trantor T128, the | |
1543 | * tighter 'C' code breaks and requires this) solves the problem - | |
1544 | * the 1 us delay is arbitrary, and only used because this delay will | |
1545 | * be the same on other platforms and since it works here, it should | |
1546 | * work there. | |
1547 | * | |
1548 | * wingel suggests that this could be due to failing to wait | |
1549 | * one deskew delay. | |
1550 | */ | |
1da177e4 | 1551 | |
c28bda25 | 1552 | udelay(1); |
1da177e4 | 1553 | |
d65e634a | 1554 | dprintk(NDEBUG_SELECTION, "scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
1da177e4 | 1555 | |
c28bda25 RZ |
1556 | /* |
1557 | * The SCSI specification calls for a 250 ms timeout for the actual | |
1558 | * selection. | |
1559 | */ | |
1da177e4 | 1560 | |
c28bda25 | 1561 | timeout = jiffies + 25; |
1da177e4 | 1562 | |
c28bda25 RZ |
1563 | /* |
1564 | * XXX very interesting - we're seeing a bounce where the BSY we | |
1565 | * asserted is being reflected / still asserted (propagation delay?) | |
1566 | * and it's detecting as true. Sigh. | |
1567 | */ | |
1da177e4 LT |
1568 | |
1569 | #if 0 | |
c28bda25 RZ |
1570 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert |
1571 | * IO while SEL is true. But again, there are some disks out the in the | |
1572 | * world that do that nevertheless. (Somebody claimed that this announces | |
1573 | * reselection capability of the target.) So we better skip that test and | |
1574 | * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) | |
1575 | */ | |
1576 | ||
1577 | while (time_before(jiffies, timeout) && | |
1578 | !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO))) | |
1579 | ; | |
1580 | ||
1581 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { | |
1582 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1583 | NCR5380_reselect(instance); | |
1584 | printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", | |
1585 | HOSTNO); | |
1586 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
1587 | return -1; | |
1588 | } | |
1da177e4 | 1589 | #else |
c28bda25 RZ |
1590 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)) |
1591 | ; | |
1da177e4 LT |
1592 | #endif |
1593 | ||
c28bda25 RZ |
1594 | /* |
1595 | * No less than two deskew delays after the initiator detects the | |
1596 | * BSY signal is true, it shall release the SEL signal and may | |
1597 | * change the DATA BUS. -wingel | |
1598 | */ | |
1da177e4 | 1599 | |
c28bda25 | 1600 | udelay(1); |
1da177e4 | 1601 | |
c28bda25 | 1602 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
1da177e4 | 1603 | |
c28bda25 RZ |
1604 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
1605 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1606 | if (hostdata->targets_present & (1 << cmd->device->id)) { | |
1607 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); | |
1608 | if (hostdata->restart_select) | |
1609 | printk(KERN_NOTICE "\trestart select\n"); | |
8ad3a593 | 1610 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
1611 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1612 | return -1; | |
1613 | } | |
1614 | cmd->result = DID_BAD_TARGET << 16; | |
1da177e4 | 1615 | #ifdef NCR5380_STATS |
c28bda25 | 1616 | collect_stats(hostdata, cmd); |
1da177e4 LT |
1617 | #endif |
1618 | #ifdef SUPPORT_TAGS | |
c28bda25 | 1619 | cmd_free_tag(cmd); |
1da177e4 | 1620 | #endif |
c28bda25 RZ |
1621 | cmd->scsi_done(cmd); |
1622 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
d65e634a | 1623 | dprintk(NDEBUG_SELECTION, "scsi%d: target did not respond within 250ms\n", HOSTNO); |
c28bda25 RZ |
1624 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | hostdata->targets_present |= (1 << cmd->device->id); | |
1629 | ||
1630 | /* | |
1631 | * Since we followed the SCSI spec, and raised ATN while SEL | |
1632 | * was true but before BSY was false during selection, the information | |
1633 | * transfer phase should be a MESSAGE OUT phase so that we can send the | |
1634 | * IDENTIFY message. | |
1635 | * | |
1636 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG | |
1637 | * message (2 bytes) with a tag ID that we increment with every command | |
1638 | * until it wraps back to 0. | |
1639 | * | |
1640 | * XXX - it turns out that there are some broken SCSI-II devices, | |
1641 | * which claim to support tagged queuing but fail when more than | |
1642 | * some number of commands are issued at once. | |
1643 | */ | |
1644 | ||
1645 | /* Wait for start of REQ/ACK handshake */ | |
1646 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
1647 | ; | |
1648 | ||
d65e634a | 1649 | dprintk(NDEBUG_SELECTION, "scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
c28bda25 RZ |
1650 | HOSTNO, cmd->device->id); |
1651 | tmp[0] = IDENTIFY(1, cmd->device->lun); | |
1da177e4 LT |
1652 | |
1653 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
1654 | if (cmd->tag != TAG_NONE) { |
1655 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; | |
1656 | tmp[2] = cmd->tag; | |
1657 | len = 3; | |
1658 | } else | |
1659 | len = 1; | |
1da177e4 | 1660 | #else |
c28bda25 RZ |
1661 | len = 1; |
1662 | cmd->tag = 0; | |
1da177e4 LT |
1663 | #endif /* SUPPORT_TAGS */ |
1664 | ||
c28bda25 RZ |
1665 | /* Send message(s) */ |
1666 | data = tmp; | |
1667 | phase = PHASE_MSGOUT; | |
1668 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 1669 | dprintk(NDEBUG_SELECTION, "scsi%d: nexus established.\n", HOSTNO); |
c28bda25 RZ |
1670 | /* XXX need to handle errors here */ |
1671 | hostdata->connected = cmd; | |
1da177e4 | 1672 | #ifndef SUPPORT_TAGS |
c28bda25 RZ |
1673 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
1674 | #endif | |
1da177e4 | 1675 | |
c28bda25 | 1676 | initialize_SCp(cmd); |
1da177e4 | 1677 | |
c28bda25 | 1678 | return 0; |
1da177e4 LT |
1679 | } |
1680 | ||
c28bda25 RZ |
1681 | /* |
1682 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, | |
1da177e4 LT |
1683 | * unsigned char *phase, int *count, unsigned char **data) |
1684 | * | |
1685 | * Purpose : transfers data in given phase using polled I/O | |
1686 | * | |
c28bda25 RZ |
1687 | * Inputs : instance - instance of driver, *phase - pointer to |
1688 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1689 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1690 | * |
1da177e4 | 1691 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1692 | * maximum number of bytes, 0 if all bytes are transferred or exit |
1da177e4 LT |
1693 | * is in same phase. |
1694 | * | |
c28bda25 | 1695 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1696 | * |
1697 | * XXX Note : handling for bus free may be useful. | |
1698 | */ | |
1699 | ||
1700 | /* | |
c28bda25 | 1701 | * Note : this code is not as quick as it could be, however it |
1da177e4 LT |
1702 | * IS 100% reliable, and for the actual data transfer where speed |
1703 | * counts, we will always do a pseudo DMA or DMA transfer. | |
1704 | */ | |
1705 | ||
c28bda25 RZ |
1706 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
1707 | unsigned char *phase, int *count, | |
1708 | unsigned char **data) | |
1da177e4 | 1709 | { |
c28bda25 RZ |
1710 | register unsigned char p = *phase, tmp; |
1711 | register int c = *count; | |
1712 | register unsigned char *d = *data; | |
1713 | ||
1714 | /* | |
1715 | * The NCR5380 chip will only drive the SCSI bus when the | |
1716 | * phase specified in the appropriate bits of the TARGET COMMAND | |
1717 | * REGISTER match the STATUS REGISTER | |
1da177e4 | 1718 | */ |
1da177e4 | 1719 | |
c28bda25 | 1720 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 | 1721 | |
c28bda25 RZ |
1722 | do { |
1723 | /* | |
1724 | * Wait for assertion of REQ, after which the phase bits will be | |
1725 | * valid | |
1726 | */ | |
1727 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) | |
1728 | ; | |
1da177e4 | 1729 | |
d65e634a | 1730 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: REQ detected\n", HOSTNO); |
1da177e4 | 1731 | |
c28bda25 RZ |
1732 | /* Check for phase mismatch */ |
1733 | if ((tmp & PHASE_MASK) != p) { | |
d65e634a | 1734 | dprintk(NDEBUG_PIO, "scsi%d: phase mismatch\n", HOSTNO); |
8ad3a593 | 1735 | NCR5380_dprint_phase(NDEBUG_PIO, instance); |
c28bda25 RZ |
1736 | break; |
1737 | } | |
1da177e4 | 1738 | |
c28bda25 RZ |
1739 | /* Do actual transfer from SCSI bus to / from memory */ |
1740 | if (!(p & SR_IO)) | |
1741 | NCR5380_write(OUTPUT_DATA_REG, *d); | |
1742 | else | |
1743 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); | |
1da177e4 | 1744 | |
c28bda25 | 1745 | ++d; |
1da177e4 | 1746 | |
c28bda25 RZ |
1747 | /* |
1748 | * The SCSI standard suggests that in MSGOUT phase, the initiator | |
1749 | * should drop ATN on the last byte of the message phase | |
1750 | * after REQ has been asserted for the handshake but before | |
1751 | * the initiator raises ACK. | |
1752 | */ | |
1da177e4 | 1753 | |
c28bda25 RZ |
1754 | if (!(p & SR_IO)) { |
1755 | if (!((p & SR_MSG) && c > 1)) { | |
1756 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
8ad3a593 | 1757 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1758 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1759 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); | |
1760 | } else { | |
1761 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
1762 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); | |
8ad3a593 | 1763 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1764 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
1765 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); | |
1766 | } | |
1767 | } else { | |
8ad3a593 | 1768 | NCR5380_dprint(NDEBUG_PIO, instance); |
c28bda25 RZ |
1769 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
1770 | } | |
1da177e4 | 1771 | |
c28bda25 RZ |
1772 | while (NCR5380_read(STATUS_REG) & SR_REQ) |
1773 | ; | |
1774 | ||
d65e634a | 1775 | dprintk(NDEBUG_HANDSHAKE, "scsi%d: req false, handshake complete\n", HOSTNO); |
c28bda25 RZ |
1776 | |
1777 | /* | |
1778 | * We have several special cases to consider during REQ/ACK handshaking : | |
1779 | * 1. We were in MSGOUT phase, and we are on the last byte of the | |
1780 | * message. ATN must be dropped as ACK is dropped. | |
1781 | * | |
1782 | * 2. We are in a MSGIN phase, and we are on the last byte of the | |
1783 | * message. We must exit with ACK asserted, so that the calling | |
1784 | * code may raise ATN before dropping ACK to reject the message. | |
1785 | * | |
1786 | * 3. ACK and ATN are clear and the target may proceed as normal. | |
1787 | */ | |
1788 | if (!(p == PHASE_MSGIN && c == 1)) { | |
1789 | if (p == PHASE_MSGOUT && c > 1) | |
1790 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1791 | else | |
1792 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1793 | } | |
1794 | } while (--c); | |
1795 | ||
d65e634a | 1796 | dprintk(NDEBUG_PIO, "scsi%d: residual %d\n", HOSTNO, c); |
c28bda25 RZ |
1797 | |
1798 | *count = c; | |
1799 | *data = d; | |
1800 | tmp = NCR5380_read(STATUS_REG); | |
1801 | /* The phase read from the bus is valid if either REQ is (already) | |
1802 | * asserted or if ACK hasn't been released yet. The latter is the case if | |
1803 | * we're in MSGIN and all wanted bytes have been received. | |
1804 | */ | |
1805 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) | |
1806 | *phase = tmp & PHASE_MASK; | |
1807 | else | |
1808 | *phase = PHASE_UNKNOWN; | |
1809 | ||
1810 | if (!c || (*phase == p)) | |
1811 | return 0; | |
1812 | else | |
1813 | return -1; | |
1da177e4 LT |
1814 | } |
1815 | ||
1816 | /* | |
1817 | * Function : do_abort (Scsi_Host *host) | |
c28bda25 RZ |
1818 | * |
1819 | * Purpose : abort the currently established nexus. Should only be | |
1820 | * called from a routine which can drop into a | |
1821 | * | |
1da177e4 LT |
1822 | * Returns : 0 on success, -1 on failure. |
1823 | */ | |
1824 | ||
c28bda25 | 1825 | static int do_abort(struct Scsi_Host *host) |
1da177e4 | 1826 | { |
c28bda25 RZ |
1827 | unsigned char tmp, *msgptr, phase; |
1828 | int len; | |
1829 | ||
1830 | /* Request message out phase */ | |
1da177e4 | 1831 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
c28bda25 RZ |
1832 | |
1833 | /* | |
1834 | * Wait for the target to indicate a valid phase by asserting | |
1835 | * REQ. Once this happens, we'll have either a MSGOUT phase | |
1836 | * and can immediately send the ABORT message, or we'll have some | |
1837 | * other phase and will have to source/sink data. | |
1838 | * | |
1839 | * We really don't care what value was on the bus or what value | |
1840 | * the target sees, so we just handshake. | |
1841 | */ | |
1842 | ||
3be38e7a | 1843 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) |
c28bda25 RZ |
1844 | ; |
1845 | ||
1846 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1847 | ||
1848 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { | |
1849 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1850 | ICR_ASSERT_ACK); | |
1851 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1852 | ; | |
1853 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
1854 | } | |
1855 | ||
1856 | tmp = ABORT; | |
1857 | msgptr = &tmp; | |
1858 | len = 1; | |
1859 | phase = PHASE_MSGOUT; | |
1860 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); | |
1861 | ||
1862 | /* | |
1863 | * If we got here, and the command completed successfully, | |
1864 | * we're about to go into bus free state. | |
1865 | */ | |
1866 | ||
1867 | return len ? -1 : 0; | |
1da177e4 LT |
1868 | } |
1869 | ||
1870 | #if defined(REAL_DMA) | |
c28bda25 RZ |
1871 | /* |
1872 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, | |
1da177e4 LT |
1873 | * unsigned char *phase, int *count, unsigned char **data) |
1874 | * | |
1875 | * Purpose : transfers data in given phase using either real | |
1876 | * or pseudo DMA. | |
1877 | * | |
c28bda25 RZ |
1878 | * Inputs : instance - instance of driver, *phase - pointer to |
1879 | * what phase is expected, *count - pointer to number of | |
1da177e4 | 1880 | * bytes to transfer, **data - pointer to data pointer. |
c28bda25 | 1881 | * |
1da177e4 | 1882 | * Returns : -1 when different phase is entered without transferring |
25985edc | 1883 | * maximum number of bytes, 0 if all bytes or transferred or exit |
1da177e4 LT |
1884 | * is in same phase. |
1885 | * | |
c28bda25 | 1886 | * Also, *phase, *count, *data are modified in place. |
1da177e4 LT |
1887 | * |
1888 | */ | |
1889 | ||
1890 | ||
c28bda25 RZ |
1891 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
1892 | unsigned char *phase, int *count, | |
1893 | unsigned char **data) | |
1da177e4 | 1894 | { |
c28bda25 RZ |
1895 | SETUP_HOSTDATA(instance); |
1896 | register int c = *count; | |
1897 | register unsigned char p = *phase; | |
1898 | register unsigned char *d = *data; | |
1899 | unsigned char tmp; | |
1900 | unsigned long flags; | |
1901 | ||
1902 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { | |
1903 | *phase = tmp; | |
1904 | return -1; | |
1905 | } | |
1da177e4 | 1906 | |
c28bda25 RZ |
1907 | if (atari_read_overruns && (p & SR_IO)) |
1908 | c -= atari_read_overruns; | |
1da177e4 | 1909 | |
d65e634a | 1910 | dprintk(NDEBUG_DMA, "scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
c28bda25 RZ |
1911 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
1912 | c, (p & SR_IO) ? "to" : "from", d); | |
1da177e4 | 1913 | |
c28bda25 | 1914 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
1da177e4 LT |
1915 | |
1916 | #ifdef REAL_DMA | |
c28bda25 | 1917 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
1da177e4 LT |
1918 | #endif /* def REAL_DMA */ |
1919 | ||
c28bda25 RZ |
1920 | if (IS_A_TT()) { |
1921 | /* On the Medusa, it is a must to initialize the DMA before | |
1922 | * starting the NCR. This is also the cleaner way for the TT. | |
1923 | */ | |
1924 | local_irq_save(flags); | |
1925 | hostdata->dma_len = (p & SR_IO) ? | |
1926 | NCR5380_dma_read_setup(instance, d, c) : | |
1927 | NCR5380_dma_write_setup(instance, d, c); | |
1928 | local_irq_restore(flags); | |
1929 | } | |
1930 | ||
1931 | if (p & SR_IO) | |
1932 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); | |
1933 | else { | |
1934 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); | |
1935 | NCR5380_write(START_DMA_SEND_REG, 0); | |
1936 | } | |
1937 | ||
1938 | if (!IS_A_TT()) { | |
1939 | /* On the Falcon, the DMA setup must be done after the last */ | |
1940 | /* NCR access, else the DMA setup gets trashed! | |
1941 | */ | |
1942 | local_irq_save(flags); | |
1943 | hostdata->dma_len = (p & SR_IO) ? | |
1944 | NCR5380_dma_read_setup(instance, d, c) : | |
1945 | NCR5380_dma_write_setup(instance, d, c); | |
1946 | local_irq_restore(flags); | |
1947 | } | |
1948 | return 0; | |
1da177e4 LT |
1949 | } |
1950 | #endif /* defined(REAL_DMA) */ | |
1951 | ||
1952 | /* | |
1953 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) | |
1954 | * | |
c28bda25 RZ |
1955 | * Purpose : run through the various SCSI phases and do as the target |
1956 | * directs us to. Operates on the currently connected command, | |
1da177e4 LT |
1957 | * instance->connected. |
1958 | * | |
1959 | * Inputs : instance, instance for which we are doing commands | |
1960 | * | |
c28bda25 | 1961 | * Side effects : SCSI things happen, the disconnected queue will be |
1da177e4 LT |
1962 | * modified if a command disconnects, *instance->connected will |
1963 | * change. | |
1964 | * | |
c28bda25 RZ |
1965 | * XXX Note : we need to watch for bus free or a reset condition here |
1966 | * to recover from an unexpected bus free condition. | |
1da177e4 | 1967 | */ |
c28bda25 RZ |
1968 | |
1969 | static void NCR5380_information_transfer(struct Scsi_Host *instance) | |
1da177e4 | 1970 | { |
c28bda25 RZ |
1971 | SETUP_HOSTDATA(instance); |
1972 | unsigned long flags; | |
1973 | unsigned char msgout = NOP; | |
1974 | int sink = 0; | |
1975 | int len; | |
1da177e4 | 1976 | #if defined(REAL_DMA) |
c28bda25 | 1977 | int transfersize; |
1da177e4 | 1978 | #endif |
c28bda25 RZ |
1979 | unsigned char *data; |
1980 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; | |
1981 | Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; | |
1982 | ||
1983 | while (1) { | |
1984 | tmp = NCR5380_read(STATUS_REG); | |
1985 | /* We only have a valid SCSI phase when REQ is asserted */ | |
1986 | if (tmp & SR_REQ) { | |
1987 | phase = (tmp & PHASE_MASK); | |
1988 | if (phase != old_phase) { | |
1989 | old_phase = phase; | |
8ad3a593 | 1990 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
c28bda25 | 1991 | } |
1da177e4 | 1992 | |
c28bda25 RZ |
1993 | if (sink && (phase != PHASE_MSGOUT)) { |
1994 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); | |
1995 | ||
1996 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | | |
1997 | ICR_ASSERT_ACK); | |
1998 | while (NCR5380_read(STATUS_REG) & SR_REQ) | |
1999 | ; | |
2000 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2001 | ICR_ASSERT_ATN); | |
2002 | sink = 0; | |
2003 | continue; | |
2004 | } | |
2005 | ||
2006 | switch (phase) { | |
2007 | case PHASE_DATAOUT: | |
1da177e4 | 2008 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
c28bda25 RZ |
2009 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
2010 | "aborted\n", HOSTNO); | |
2011 | sink = 1; | |
2012 | do_abort(instance); | |
2013 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2014 | cmd->scsi_done(cmd); |
c28bda25 | 2015 | return; |
1da177e4 | 2016 | #endif |
c28bda25 RZ |
2017 | case PHASE_DATAIN: |
2018 | /* | |
2019 | * If there is no room left in the current buffer in the | |
2020 | * scatter-gather list, move onto the next one. | |
2021 | */ | |
2022 | ||
2023 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { | |
2024 | ++cmd->SCp.buffer; | |
2025 | --cmd->SCp.buffers_residual; | |
2026 | cmd->SCp.this_residual = cmd->SCp.buffer->length; | |
45711f1a | 2027 | cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
c28bda25 RZ |
2028 | /* ++roman: Try to merge some scatter-buffers if |
2029 | * they are at contiguous physical addresses. | |
2030 | */ | |
2031 | merge_contiguous_buffers(cmd); | |
d65e634a | 2032 | dprintk(NDEBUG_INFORMATION, "scsi%d: %d bytes and %d buffers left\n", |
c28bda25 RZ |
2033 | HOSTNO, cmd->SCp.this_residual, |
2034 | cmd->SCp.buffers_residual); | |
2035 | } | |
2036 | ||
2037 | /* | |
2038 | * The preferred transfer method is going to be | |
2039 | * PSEUDO-DMA for systems that are strictly PIO, | |
2040 | * since we can let the hardware do the handshaking. | |
2041 | * | |
2042 | * For this to work, we need to know the transfersize | |
2043 | * ahead of time, since the pseudo-DMA code will sit | |
2044 | * in an unconditional loop. | |
2045 | */ | |
2046 | ||
2047 | /* ++roman: I suggest, this should be | |
2048 | * #if def(REAL_DMA) | |
2049 | * instead of leaving REAL_DMA out. | |
2050 | */ | |
1da177e4 LT |
2051 | |
2052 | #if defined(REAL_DMA) | |
c28bda25 RZ |
2053 | if (!cmd->device->borken && |
2054 | (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) { | |
2055 | len = transfersize; | |
2056 | cmd->SCp.phase = phase; | |
2057 | if (NCR5380_transfer_dma(instance, &phase, | |
2058 | &len, (unsigned char **)&cmd->SCp.ptr)) { | |
2059 | /* | |
2060 | * If the watchdog timer fires, all future | |
2061 | * accesses to this device will use the | |
2062 | * polled-IO. */ | |
2063 | printk(KERN_NOTICE "scsi%d: switching target %d " | |
2064 | "lun %d to slow handshake\n", HOSTNO, | |
2065 | cmd->device->id, cmd->device->lun); | |
2066 | cmd->device->borken = 1; | |
2067 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | | |
2068 | ICR_ASSERT_ATN); | |
2069 | sink = 1; | |
2070 | do_abort(instance); | |
2071 | cmd->result = DID_ERROR << 16; | |
cce99c69 | 2072 | cmd->scsi_done(cmd); |
c28bda25 RZ |
2073 | /* XXX - need to source or sink data here, as appropriate */ |
2074 | } else { | |
1da177e4 | 2075 | #ifdef REAL_DMA |
c28bda25 RZ |
2076 | /* ++roman: When using real DMA, |
2077 | * information_transfer() should return after | |
2078 | * starting DMA since it has nothing more to | |
2079 | * do. | |
2080 | */ | |
2081 | return; | |
2082 | #else | |
2083 | cmd->SCp.this_residual -= transfersize - len; | |
1da177e4 | 2084 | #endif |
c28bda25 RZ |
2085 | } |
2086 | } else | |
1da177e4 | 2087 | #endif /* defined(REAL_DMA) */ |
c28bda25 RZ |
2088 | NCR5380_transfer_pio(instance, &phase, |
2089 | (int *)&cmd->SCp.this_residual, | |
2090 | (unsigned char **)&cmd->SCp.ptr); | |
2091 | break; | |
2092 | case PHASE_MSGIN: | |
2093 | len = 1; | |
2094 | data = &tmp; | |
2095 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ | |
2096 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2097 | cmd->SCp.Message = tmp; | |
2098 | ||
2099 | switch (tmp) { | |
2100 | /* | |
2101 | * Linking lets us reduce the time required to get the | |
2102 | * next command out to the device, hopefully this will | |
2103 | * mean we don't waste another revolution due to the delays | |
2104 | * required by ARBITRATION and another SELECTION. | |
2105 | * | |
2106 | * In the current implementation proposal, low level drivers | |
2107 | * merely have to start the next command, pointed to by | |
2108 | * next_link, done() is called as with unlinked commands. | |
2109 | */ | |
1da177e4 | 2110 | #ifdef LINKED |
c28bda25 RZ |
2111 | case LINKED_CMD_COMPLETE: |
2112 | case LINKED_FLG_CMD_COMPLETE: | |
2113 | /* Accept message by clearing ACK */ | |
2114 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2115 | ||
d65e634a | 2116 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked command " |
c28bda25 RZ |
2117 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
2118 | ||
2119 | /* Enable reselect interrupts */ | |
2120 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2121 | /* | |
2122 | * Sanity check : A linked command should only terminate | |
2123 | * with one of these messages if there are more linked | |
2124 | * commands available. | |
2125 | */ | |
2126 | ||
2127 | if (!cmd->next_link) { | |
2128 | printk(KERN_NOTICE "scsi%d: target %d lun %d " | |
2129 | "linked command complete, no next_link\n", | |
2130 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2131 | sink = 1; | |
2132 | do_abort(instance); | |
2133 | return; | |
2134 | } | |
2135 | ||
2136 | initialize_SCp(cmd->next_link); | |
2137 | /* The next command is still part of this process; copy it | |
2138 | * and don't free it! */ | |
2139 | cmd->next_link->tag = cmd->tag; | |
2140 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
d65e634a | 2141 | dprintk(NDEBUG_LINKED, "scsi%d: target %d lun %d linked request " |
c28bda25 RZ |
2142 | "done, calling scsi_done().\n", |
2143 | HOSTNO, cmd->device->id, cmd->device->lun); | |
1da177e4 | 2144 | #ifdef NCR5380_STATS |
c28bda25 | 2145 | collect_stats(hostdata, cmd); |
1da177e4 | 2146 | #endif |
c28bda25 RZ |
2147 | cmd->scsi_done(cmd); |
2148 | cmd = hostdata->connected; | |
2149 | break; | |
1da177e4 | 2150 | #endif /* def LINKED */ |
c28bda25 RZ |
2151 | case ABORT: |
2152 | case COMMAND_COMPLETE: | |
2153 | /* Accept message by clearing ACK */ | |
2154 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2155 | /* ++guenther: possible race with Falcon locking */ | |
2156 | falcon_dont_release++; | |
2157 | hostdata->connected = NULL; | |
d65e634a | 2158 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d, lun %d " |
c28bda25 | 2159 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
1da177e4 | 2160 | #ifdef SUPPORT_TAGS |
c28bda25 RZ |
2161 | cmd_free_tag(cmd); |
2162 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { | |
2163 | /* Turn a QUEUE FULL status into BUSY, I think the | |
2164 | * mid level cannot handle QUEUE FULL :-( (The | |
2165 | * command is retried after BUSY). Also update our | |
2166 | * queue size to the number of currently issued | |
2167 | * commands now. | |
2168 | */ | |
2169 | /* ++Andreas: the mid level code knows about | |
2170 | QUEUE_FULL now. */ | |
2171 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; | |
d65e634a | 2172 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d returned " |
c28bda25 RZ |
2173 | "QUEUE_FULL after %d commands\n", |
2174 | HOSTNO, cmd->device->id, cmd->device->lun, | |
2175 | ta->nr_allocated); | |
2176 | if (ta->queue_size > ta->nr_allocated) | |
2177 | ta->nr_allocated = ta->queue_size; | |
2178 | } | |
1da177e4 | 2179 | #else |
c28bda25 | 2180 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2181 | #endif |
c28bda25 RZ |
2182 | /* Enable reselect interrupts */ |
2183 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2184 | ||
2185 | /* | |
2186 | * I'm not sure what the correct thing to do here is : | |
2187 | * | |
2188 | * If the command that just executed is NOT a request | |
2189 | * sense, the obvious thing to do is to set the result | |
2190 | * code to the values of the stored parameters. | |
2191 | * | |
2192 | * If it was a REQUEST SENSE command, we need some way to | |
2193 | * differentiate between the failure code of the original | |
2194 | * and the failure code of the REQUEST sense - the obvious | |
2195 | * case is success, where we fall through and leave the | |
2196 | * result code unchanged. | |
2197 | * | |
2198 | * The non-obvious place is where the REQUEST SENSE failed | |
2199 | */ | |
2200 | ||
2201 | if (cmd->cmnd[0] != REQUEST_SENSE) | |
2202 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); | |
2203 | else if (status_byte(cmd->SCp.Status) != GOOD) | |
2204 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); | |
1da177e4 | 2205 | |
c28bda25 | 2206 | #ifdef AUTOSENSE |
28424d3a BH |
2207 | if ((cmd->cmnd[0] == REQUEST_SENSE) && |
2208 | hostdata->ses.cmd_len) { | |
2209 | scsi_eh_restore_cmnd(cmd, &hostdata->ses); | |
2210 | hostdata->ses.cmd_len = 0 ; | |
2211 | } | |
2212 | ||
c28bda25 RZ |
2213 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
2214 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { | |
28424d3a BH |
2215 | scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
2216 | ||
d65e634a | 2217 | dprintk(NDEBUG_AUTOSENSE, "scsi%d: performing request sense\n", HOSTNO); |
c28bda25 RZ |
2218 | |
2219 | local_irq_save(flags); | |
2220 | LIST(cmd,hostdata->issue_queue); | |
3130d905 | 2221 | SET_NEXT(cmd, hostdata->issue_queue); |
c28bda25 RZ |
2222 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
2223 | local_irq_restore(flags); | |
d65e634a | 2224 | dprintk(NDEBUG_QUEUES, "scsi%d: REQUEST SENSE added to head of " |
c28bda25 RZ |
2225 | "issue queue\n", H_NO(cmd)); |
2226 | } else | |
1da177e4 | 2227 | #endif /* def AUTOSENSE */ |
c28bda25 | 2228 | { |
1da177e4 | 2229 | #ifdef NCR5380_STATS |
c28bda25 | 2230 | collect_stats(hostdata, cmd); |
1da177e4 | 2231 | #endif |
c28bda25 RZ |
2232 | cmd->scsi_done(cmd); |
2233 | } | |
2234 | ||
2235 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2236 | /* | |
2237 | * Restore phase bits to 0 so an interrupted selection, | |
2238 | * arbitration can resume. | |
2239 | */ | |
2240 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2241 | ||
2242 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2243 | barrier(); | |
2244 | ||
2245 | falcon_dont_release--; | |
2246 | /* ++roman: For Falcon SCSI, release the lock on the | |
2247 | * ST-DMA here if no other commands are waiting on the | |
2248 | * disconnected queue. | |
2249 | */ | |
2250 | falcon_release_lock_if_possible(hostdata); | |
2251 | return; | |
2252 | case MESSAGE_REJECT: | |
2253 | /* Accept message by clearing ACK */ | |
2254 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2255 | /* Enable reselect interrupts */ | |
2256 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2257 | switch (hostdata->last_message) { | |
2258 | case HEAD_OF_QUEUE_TAG: | |
2259 | case ORDERED_QUEUE_TAG: | |
2260 | case SIMPLE_QUEUE_TAG: | |
2261 | /* The target obviously doesn't support tagged | |
2262 | * queuing, even though it announced this ability in | |
2263 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, | |
2264 | * clear 'tagged_supported' and lock the LUN, since | |
2265 | * the command is treated as untagged further on. | |
2266 | */ | |
2267 | cmd->device->tagged_supported = 0; | |
2268 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); | |
2269 | cmd->tag = TAG_NONE; | |
d65e634a | 2270 | dprintk(NDEBUG_TAGS, "scsi%d: target %d lun %d rejected " |
c28bda25 RZ |
2271 | "QUEUE_TAG message; tagged queuing " |
2272 | "disabled\n", | |
2273 | HOSTNO, cmd->device->id, cmd->device->lun); | |
2274 | break; | |
2275 | } | |
2276 | break; | |
2277 | case DISCONNECT: | |
2278 | /* Accept message by clearing ACK */ | |
2279 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2280 | local_irq_save(flags); | |
2281 | cmd->device->disconnect = 1; | |
2282 | LIST(cmd,hostdata->disconnected_queue); | |
3130d905 | 2283 | SET_NEXT(cmd, hostdata->disconnected_queue); |
c28bda25 RZ |
2284 | hostdata->connected = NULL; |
2285 | hostdata->disconnected_queue = cmd; | |
2286 | local_irq_restore(flags); | |
d65e634a | 2287 | dprintk(NDEBUG_QUEUES, "scsi%d: command for target %d lun %d was " |
c28bda25 RZ |
2288 | "moved from connected to the " |
2289 | "disconnected_queue\n", HOSTNO, | |
2290 | cmd->device->id, cmd->device->lun); | |
2291 | /* | |
2292 | * Restore phase bits to 0 so an interrupted selection, | |
2293 | * arbitration can resume. | |
2294 | */ | |
2295 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2296 | ||
2297 | /* Enable reselect interrupts */ | |
2298 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2299 | /* Wait for bus free to avoid nasty timeouts */ | |
2300 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) | |
2301 | barrier(); | |
2302 | return; | |
2303 | /* | |
2304 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect | |
2305 | * operation, in violation of the SCSI spec so we can safely | |
2306 | * ignore SAVE/RESTORE pointers calls. | |
2307 | * | |
2308 | * Unfortunately, some disks violate the SCSI spec and | |
2309 | * don't issue the required SAVE_POINTERS message before | |
2310 | * disconnecting, and we have to break spec to remain | |
2311 | * compatible. | |
2312 | */ | |
2313 | case SAVE_POINTERS: | |
2314 | case RESTORE_POINTERS: | |
2315 | /* Accept message by clearing ACK */ | |
2316 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2317 | /* Enable reselect interrupts */ | |
2318 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2319 | break; | |
2320 | case EXTENDED_MESSAGE: | |
2321 | /* | |
2322 | * Extended messages are sent in the following format : | |
2323 | * Byte | |
2324 | * 0 EXTENDED_MESSAGE == 1 | |
2325 | * 1 length (includes one byte for code, doesn't | |
2326 | * include first two bytes) | |
2327 | * 2 code | |
2328 | * 3..length+1 arguments | |
2329 | * | |
2330 | * Start the extended message buffer with the EXTENDED_MESSAGE | |
2331 | * byte, since spi_print_msg() wants the whole thing. | |
2332 | */ | |
2333 | extended_msg[0] = EXTENDED_MESSAGE; | |
2334 | /* Accept first byte by clearing ACK */ | |
2335 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2336 | ||
d65e634a | 2337 | dprintk(NDEBUG_EXTENDED, "scsi%d: receiving extended message\n", HOSTNO); |
c28bda25 RZ |
2338 | |
2339 | len = 2; | |
2340 | data = extended_msg + 1; | |
2341 | phase = PHASE_MSGIN; | |
2342 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2343 | dprintk(NDEBUG_EXTENDED, "scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
c28bda25 RZ |
2344 | (int)extended_msg[1], (int)extended_msg[2]); |
2345 | ||
2346 | if (!len && extended_msg[1] <= | |
2347 | (sizeof(extended_msg) - 1)) { | |
2348 | /* Accept third byte by clearing ACK */ | |
2349 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2350 | len = extended_msg[1] - 1; | |
2351 | data = extended_msg + 3; | |
2352 | phase = PHASE_MSGIN; | |
2353 | ||
2354 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
d65e634a | 2355 | dprintk(NDEBUG_EXTENDED, "scsi%d: message received, residual %d\n", |
c28bda25 RZ |
2356 | HOSTNO, len); |
2357 | ||
2358 | switch (extended_msg[2]) { | |
2359 | case EXTENDED_SDTR: | |
2360 | case EXTENDED_WDTR: | |
2361 | case EXTENDED_MODIFY_DATA_POINTER: | |
2362 | case EXTENDED_EXTENDED_IDENTIFY: | |
2363 | tmp = 0; | |
2364 | } | |
2365 | } else if (len) { | |
2366 | printk(KERN_NOTICE "scsi%d: error receiving " | |
2367 | "extended message\n", HOSTNO); | |
2368 | tmp = 0; | |
2369 | } else { | |
2370 | printk(KERN_NOTICE "scsi%d: extended message " | |
2371 | "code %02x length %d is too long\n", | |
2372 | HOSTNO, extended_msg[2], extended_msg[1]); | |
2373 | tmp = 0; | |
2374 | } | |
2375 | /* Fall through to reject message */ | |
2376 | ||
2377 | /* | |
2378 | * If we get something weird that we aren't expecting, | |
2379 | * reject it. | |
2380 | */ | |
2381 | default: | |
2382 | if (!tmp) { | |
2383 | printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); | |
2384 | spi_print_msg(extended_msg); | |
2385 | printk("\n"); | |
2386 | } else if (tmp != EXTENDED_MESSAGE) | |
2387 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
2388 | "message %02x from target %d, lun %d\n", | |
2389 | HOSTNO, tmp, cmd->device->id, cmd->device->lun); | |
2390 | else | |
2391 | printk(KERN_DEBUG "scsi%d: rejecting unknown " | |
2392 | "extended message " | |
2393 | "code %02x, length %d from target %d, lun %d\n", | |
2394 | HOSTNO, extended_msg[1], extended_msg[0], | |
2395 | cmd->device->id, cmd->device->lun); | |
2396 | ||
2397 | ||
2398 | msgout = MESSAGE_REJECT; | |
2399 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); | |
2400 | break; | |
2401 | } /* switch (tmp) */ | |
2402 | break; | |
2403 | case PHASE_MSGOUT: | |
2404 | len = 1; | |
2405 | data = &msgout; | |
2406 | hostdata->last_message = msgout; | |
2407 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2408 | if (msgout == ABORT) { | |
1da177e4 | 2409 | #ifdef SUPPORT_TAGS |
c28bda25 | 2410 | cmd_free_tag(cmd); |
1da177e4 | 2411 | #else |
c28bda25 | 2412 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2413 | #endif |
c28bda25 RZ |
2414 | hostdata->connected = NULL; |
2415 | cmd->result = DID_ERROR << 16; | |
1da177e4 | 2416 | #ifdef NCR5380_STATS |
c28bda25 | 2417 | collect_stats(hostdata, cmd); |
1da177e4 | 2418 | #endif |
c28bda25 RZ |
2419 | cmd->scsi_done(cmd); |
2420 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); | |
2421 | falcon_release_lock_if_possible(hostdata); | |
2422 | return; | |
2423 | } | |
2424 | msgout = NOP; | |
2425 | break; | |
2426 | case PHASE_CMDOUT: | |
2427 | len = cmd->cmd_len; | |
2428 | data = cmd->cmnd; | |
2429 | /* | |
2430 | * XXX for performance reasons, on machines with a | |
2431 | * PSEUDO-DMA architecture we should probably | |
2432 | * use the dma transfer function. | |
2433 | */ | |
2434 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2435 | break; | |
2436 | case PHASE_STATIN: | |
2437 | len = 1; | |
2438 | data = &tmp; | |
2439 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2440 | cmd->SCp.Status = tmp; | |
2441 | break; | |
2442 | default: | |
2443 | printk("scsi%d: unknown phase\n", HOSTNO); | |
8ad3a593 | 2444 | NCR5380_dprint(NDEBUG_ANY, instance); |
c28bda25 RZ |
2445 | } /* switch(phase) */ |
2446 | } /* if (tmp * SR_REQ) */ | |
2447 | } /* while (1) */ | |
1da177e4 LT |
2448 | } |
2449 | ||
2450 | /* | |
2451 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) | |
2452 | * | |
c28bda25 RZ |
2453 | * Purpose : does reselection, initializing the instance->connected |
2454 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q | |
1da177e4 | 2455 | * nexus has been reestablished, |
c28bda25 | 2456 | * |
1da177e4 LT |
2457 | * Inputs : instance - this instance of the NCR5380. |
2458 | * | |
2459 | */ | |
2460 | ||
2461 | ||
c28bda25 | 2462 | static void NCR5380_reselect(struct Scsi_Host *instance) |
1da177e4 | 2463 | { |
c28bda25 RZ |
2464 | SETUP_HOSTDATA(instance); |
2465 | unsigned char target_mask; | |
2466 | unsigned char lun, phase; | |
2467 | int len; | |
1da177e4 | 2468 | #ifdef SUPPORT_TAGS |
c28bda25 | 2469 | unsigned char tag; |
1da177e4 | 2470 | #endif |
c28bda25 RZ |
2471 | unsigned char msg[3]; |
2472 | unsigned char *data; | |
2473 | Scsi_Cmnd *tmp = NULL, *prev; | |
2474 | /* unsigned long flags; */ | |
2475 | ||
2476 | /* | |
2477 | * Disable arbitration, etc. since the host adapter obviously | |
2478 | * lost, and tell an interrupted NCR5380_select() to restart. | |
2479 | */ | |
2480 | ||
2481 | NCR5380_write(MODE_REG, MR_BASE); | |
2482 | hostdata->restart_select = 1; | |
2483 | ||
2484 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); | |
2485 | ||
d65e634a | 2486 | dprintk(NDEBUG_RESELECTION, "scsi%d: reselect\n", HOSTNO); |
c28bda25 RZ |
2487 | |
2488 | /* | |
2489 | * At this point, we have detected that our SCSI ID is on the bus, | |
2490 | * SEL is true and BSY was false for at least one bus settle delay | |
2491 | * (400 ns). | |
2492 | * | |
2493 | * We must assert BSY ourselves, until the target drops the SEL | |
2494 | * signal. | |
2495 | */ | |
2496 | ||
2497 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); | |
2498 | ||
2499 | while (NCR5380_read(STATUS_REG) & SR_SEL) | |
2500 | ; | |
2501 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2502 | ||
2503 | /* | |
2504 | * Wait for target to go into MSGIN. | |
2505 | */ | |
2506 | ||
2507 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)) | |
2508 | ; | |
2509 | ||
2510 | len = 1; | |
2511 | data = msg; | |
2512 | phase = PHASE_MSGIN; | |
2513 | NCR5380_transfer_pio(instance, &phase, &len, &data); | |
2514 | ||
2515 | if (!(msg[0] & 0x80)) { | |
2516 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); | |
2517 | spi_print_msg(msg); | |
2518 | do_abort(instance); | |
2519 | return; | |
2520 | } | |
2521 | lun = (msg[0] & 0x07); | |
1da177e4 LT |
2522 | |
2523 | #ifdef SUPPORT_TAGS | |
c28bda25 RZ |
2524 | /* If the phase is still MSGIN, the target wants to send some more |
2525 | * messages. In case it supports tagged queuing, this is probably a | |
2526 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. | |
2527 | */ | |
2528 | tag = TAG_NONE; | |
2529 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { | |
2530 | /* Accept previous IDENTIFY message by clearing ACK */ | |
2531 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2532 | len = 2; | |
2533 | data = msg + 1; | |
2534 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && | |
2535 | msg[1] == SIMPLE_QUEUE_TAG) | |
2536 | tag = msg[2]; | |
d65e634a | 2537 | dprintk(NDEBUG_TAGS, "scsi%d: target mask %02x, lun %d sent tag %d at " |
c28bda25 RZ |
2538 | "reselection\n", HOSTNO, target_mask, lun, tag); |
2539 | } | |
1da177e4 | 2540 | #endif |
c28bda25 RZ |
2541 | |
2542 | /* | |
2543 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we | |
2544 | * just reestablished, and remove it from the disconnected queue. | |
2545 | */ | |
2546 | ||
2547 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; | |
2548 | tmp; prev = tmp, tmp = NEXT(tmp)) { | |
2549 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) | |
1da177e4 | 2550 | #ifdef SUPPORT_TAGS |
c28bda25 | 2551 | && (tag == tmp->tag) |
1da177e4 | 2552 | #endif |
c28bda25 RZ |
2553 | ) { |
2554 | /* ++guenther: prevent race with falcon_release_lock */ | |
2555 | falcon_dont_release++; | |
2556 | if (prev) { | |
2557 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); | |
3130d905 | 2558 | SET_NEXT(prev, NEXT(tmp)); |
c28bda25 RZ |
2559 | } else { |
2560 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); | |
2561 | hostdata->disconnected_queue = NEXT(tmp); | |
2562 | } | |
3130d905 | 2563 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2564 | break; |
2565 | } | |
1da177e4 | 2566 | } |
c28bda25 RZ |
2567 | |
2568 | if (!tmp) { | |
2569 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " | |
1da177e4 | 2570 | #ifdef SUPPORT_TAGS |
c28bda25 | 2571 | "tag %d " |
1da177e4 | 2572 | #endif |
c28bda25 RZ |
2573 | "not in disconnected_queue.\n", |
2574 | HOSTNO, target_mask, lun | |
1da177e4 | 2575 | #ifdef SUPPORT_TAGS |
c28bda25 | 2576 | , tag |
1da177e4 | 2577 | #endif |
c28bda25 RZ |
2578 | ); |
2579 | /* | |
2580 | * Since we have an established nexus that we can't do anything | |
2581 | * with, we must abort it. | |
2582 | */ | |
2583 | do_abort(instance); | |
2584 | return; | |
2585 | } | |
1da177e4 | 2586 | |
c28bda25 RZ |
2587 | /* Accept message by clearing ACK */ |
2588 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
1da177e4 | 2589 | |
c28bda25 | 2590 | hostdata->connected = tmp; |
d65e634a | 2591 | dprintk(NDEBUG_RESELECTION, "scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", |
c28bda25 RZ |
2592 | HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); |
2593 | falcon_dont_release--; | |
1da177e4 LT |
2594 | } |
2595 | ||
2596 | ||
2597 | /* | |
2598 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) | |
2599 | * | |
2600 | * Purpose : abort a command | |
2601 | * | |
c28bda25 RZ |
2602 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the |
2603 | * host byte of the result field to, if zero DID_ABORTED is | |
1da177e4 LT |
2604 | * used. |
2605 | * | |
2606 | * Returns : 0 - success, -1 on failure. | |
2607 | * | |
c28bda25 RZ |
2608 | * XXX - there is no way to abort the command that is currently |
2609 | * connected, you have to wait for it to complete. If this is | |
1da177e4 | 2610 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
c28bda25 | 2611 | * called where the loop started in NCR5380_main(). |
1da177e4 LT |
2612 | */ |
2613 | ||
2614 | static | |
c28bda25 | 2615 | int NCR5380_abort(Scsi_Cmnd *cmd) |
1da177e4 | 2616 | { |
c28bda25 RZ |
2617 | struct Scsi_Host *instance = cmd->device->host; |
2618 | SETUP_HOSTDATA(instance); | |
2619 | Scsi_Cmnd *tmp, **prev; | |
2620 | unsigned long flags; | |
1da177e4 | 2621 | |
c28bda25 RZ |
2622 | printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); |
2623 | scsi_print_command(cmd); | |
1da177e4 | 2624 | |
c28bda25 RZ |
2625 | NCR5380_print_status(instance); |
2626 | ||
2627 | local_irq_save(flags); | |
1da177e4 | 2628 | |
c28bda25 RZ |
2629 | if (!IS_A_TT() && !falcon_got_lock) |
2630 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n", | |
2631 | HOSTNO); | |
1da177e4 | 2632 | |
d65e634a | 2633 | dprintk(NDEBUG_ABORT, "scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
c28bda25 RZ |
2634 | NCR5380_read(BUS_AND_STATUS_REG), |
2635 | NCR5380_read(STATUS_REG)); | |
1da177e4 LT |
2636 | |
2637 | #if 1 | |
c28bda25 RZ |
2638 | /* |
2639 | * Case 1 : If the command is the currently executing command, | |
2640 | * we'll set the aborted flag and return control so that | |
2641 | * information transfer routine can exit cleanly. | |
2642 | */ | |
1da177e4 | 2643 | |
c28bda25 | 2644 | if (hostdata->connected == cmd) { |
1da177e4 | 2645 | |
d65e634a | 2646 | dprintk(NDEBUG_ABORT, "scsi%d: aborting connected command\n", HOSTNO); |
c28bda25 RZ |
2647 | /* |
2648 | * We should perform BSY checking, and make sure we haven't slipped | |
2649 | * into BUS FREE. | |
2650 | */ | |
1da177e4 | 2651 | |
c28bda25 RZ |
2652 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
2653 | /* | |
2654 | * Since we can't change phases until we've completed the current | |
2655 | * handshake, we have to source or sink a byte of data if the current | |
2656 | * phase is not MSGOUT. | |
2657 | */ | |
1da177e4 | 2658 | |
c28bda25 RZ |
2659 | /* |
2660 | * Return control to the executing NCR drive so we can clear the | |
2661 | * aborted flag and get back into our main loop. | |
2662 | */ | |
1da177e4 | 2663 | |
c28bda25 RZ |
2664 | if (do_abort(instance) == 0) { |
2665 | hostdata->aborted = 1; | |
2666 | hostdata->connected = NULL; | |
2667 | cmd->result = DID_ABORT << 16; | |
1da177e4 | 2668 | #ifdef SUPPORT_TAGS |
c28bda25 | 2669 | cmd_free_tag(cmd); |
1da177e4 | 2670 | #else |
c28bda25 | 2671 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2672 | #endif |
c28bda25 RZ |
2673 | local_irq_restore(flags); |
2674 | cmd->scsi_done(cmd); | |
2675 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2676 | return SUCCESS; |
c28bda25 RZ |
2677 | } else { |
2678 | /* local_irq_restore(flags); */ | |
2679 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); | |
2b0f834c | 2680 | return FAILED; |
c28bda25 RZ |
2681 | } |
2682 | } | |
1da177e4 LT |
2683 | #endif |
2684 | ||
c28bda25 RZ |
2685 | /* |
2686 | * Case 2 : If the command hasn't been issued yet, we simply remove it | |
2687 | * from the issue queue. | |
2688 | */ | |
2689 | for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue), | |
2690 | tmp = (Scsi_Cmnd *)hostdata->issue_queue; | |
2691 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { | |
2692 | if (cmd == tmp) { | |
2693 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2694 | (*prev) = NEXT(tmp); | |
3130d905 | 2695 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2696 | tmp->result = DID_ABORT << 16; |
2697 | local_irq_restore(flags); | |
d65e634a | 2698 | dprintk(NDEBUG_ABORT, "scsi%d: abort removed command from issue queue.\n", |
c28bda25 RZ |
2699 | HOSTNO); |
2700 | /* Tagged queuing note: no tag to free here, hasn't been assigned | |
2701 | * yet... */ | |
2702 | tmp->scsi_done(tmp); | |
2703 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2704 | return SUCCESS; |
c28bda25 | 2705 | } |
1da177e4 LT |
2706 | } |
2707 | ||
c28bda25 RZ |
2708 | /* |
2709 | * Case 3 : If any commands are connected, we're going to fail the abort | |
2710 | * and let the high level SCSI driver retry at a later time or | |
2711 | * issue a reset. | |
2712 | * | |
2713 | * Timeouts, and therefore aborted commands, will be highly unlikely | |
2714 | * and handling them cleanly in this situation would make the common | |
2715 | * case of noresets less efficient, and would pollute our code. So, | |
2716 | * we fail. | |
2717 | */ | |
1da177e4 | 2718 | |
c28bda25 RZ |
2719 | if (hostdata->connected) { |
2720 | local_irq_restore(flags); | |
d65e634a | 2721 | dprintk(NDEBUG_ABORT, "scsi%d: abort failed, command connected.\n", HOSTNO); |
2b0f834c | 2722 | return FAILED; |
c28bda25 | 2723 | } |
1da177e4 | 2724 | |
c28bda25 RZ |
2725 | /* |
2726 | * Case 4: If the command is currently disconnected from the bus, and | |
2727 | * there are no connected commands, we reconnect the I_T_L or | |
2728 | * I_T_L_Q nexus associated with it, go into message out, and send | |
2729 | * an abort message. | |
2730 | * | |
2731 | * This case is especially ugly. In order to reestablish the nexus, we | |
2732 | * need to call NCR5380_select(). The easiest way to implement this | |
2733 | * function was to abort if the bus was busy, and let the interrupt | |
2734 | * handler triggered on the SEL for reselect take care of lost arbitrations | |
2735 | * where necessary, meaning interrupts need to be enabled. | |
2736 | * | |
2737 | * When interrupts are enabled, the queues may change - so we | |
2738 | * can't remove it from the disconnected queue before selecting it | |
2739 | * because that could cause a failure in hashing the nexus if that | |
2740 | * device reselected. | |
2741 | * | |
2742 | * Since the queues may change, we can't use the pointers from when we | |
2743 | * first locate it. | |
2744 | * | |
2745 | * So, we must first locate the command, and if NCR5380_select() | |
2746 | * succeeds, then issue the abort, relocate the command and remove | |
2747 | * it from the disconnected queue. | |
2748 | */ | |
2749 | ||
2750 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; | |
2751 | tmp = NEXT(tmp)) { | |
2752 | if (cmd == tmp) { | |
2753 | local_irq_restore(flags); | |
d65e634a | 2754 | dprintk(NDEBUG_ABORT, "scsi%d: aborting disconnected command.\n", HOSTNO); |
c28bda25 RZ |
2755 | |
2756 | if (NCR5380_select(instance, cmd, (int)cmd->tag)) | |
2b0f834c | 2757 | return FAILED; |
1da177e4 | 2758 | |
d65e634a | 2759 | dprintk(NDEBUG_ABORT, "scsi%d: nexus reestablished.\n", HOSTNO); |
c28bda25 RZ |
2760 | |
2761 | do_abort(instance); | |
2762 | ||
2763 | local_irq_save(flags); | |
2764 | for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue), | |
2765 | tmp = (Scsi_Cmnd *)hostdata->disconnected_queue; | |
2766 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { | |
2767 | if (cmd == tmp) { | |
2768 | REMOVE(5, *prev, tmp, NEXT(tmp)); | |
2769 | *prev = NEXT(tmp); | |
3130d905 | 2770 | SET_NEXT(tmp, NULL); |
c28bda25 RZ |
2771 | tmp->result = DID_ABORT << 16; |
2772 | /* We must unlock the tag/LUN immediately here, since the | |
2773 | * target goes to BUS FREE and doesn't send us another | |
2774 | * message (COMMAND_COMPLETE or the like) | |
2775 | */ | |
1da177e4 | 2776 | #ifdef SUPPORT_TAGS |
c28bda25 | 2777 | cmd_free_tag(tmp); |
1da177e4 | 2778 | #else |
c28bda25 | 2779 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
1da177e4 | 2780 | #endif |
c28bda25 RZ |
2781 | local_irq_restore(flags); |
2782 | tmp->scsi_done(tmp); | |
2783 | falcon_release_lock_if_possible(hostdata); | |
2b0f834c | 2784 | return SUCCESS; |
c28bda25 RZ |
2785 | } |
2786 | } | |
1da177e4 LT |
2787 | } |
2788 | } | |
2789 | ||
c28bda25 RZ |
2790 | /* |
2791 | * Case 5 : If we reached this point, the command was not found in any of | |
2792 | * the queues. | |
2793 | * | |
2794 | * We probably reached this point because of an unlikely race condition | |
2795 | * between the command completing successfully and the abortion code, | |
2796 | * so we won't panic, but we will notify the user in case something really | |
2797 | * broke. | |
2798 | */ | |
1da177e4 | 2799 | |
c28bda25 | 2800 | local_irq_restore(flags); |
ad361c98 | 2801 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); |
1da177e4 | 2802 | |
c28bda25 RZ |
2803 | /* Maybe it is sufficient just to release the ST-DMA lock... (if |
2804 | * possible at all) At least, we should check if the lock could be | |
2805 | * released after the abort, in case it is kept due to some bug. | |
2806 | */ | |
2807 | falcon_release_lock_if_possible(hostdata); | |
1da177e4 | 2808 | |
2b0f834c | 2809 | return FAILED; |
1da177e4 LT |
2810 | } |
2811 | ||
2812 | ||
c28bda25 | 2813 | /* |
1da177e4 | 2814 | * Function : int NCR5380_reset (Scsi_Cmnd *cmd) |
c28bda25 | 2815 | * |
1da177e4 LT |
2816 | * Purpose : reset the SCSI bus. |
2817 | * | |
2b0f834c | 2818 | * Returns : SUCCESS or FAILURE |
1da177e4 | 2819 | * |
c28bda25 | 2820 | */ |
1da177e4 | 2821 | |
c28bda25 | 2822 | static int NCR5380_bus_reset(Scsi_Cmnd *cmd) |
1da177e4 | 2823 | { |
c28bda25 RZ |
2824 | SETUP_HOSTDATA(cmd->device->host); |
2825 | int i; | |
2826 | unsigned long flags; | |
2b0f834c | 2827 | #if defined(RESET_RUN_DONE) |
c28bda25 | 2828 | Scsi_Cmnd *connected, *disconnected_queue; |
1da177e4 LT |
2829 | #endif |
2830 | ||
c28bda25 RZ |
2831 | if (!IS_A_TT() && !falcon_got_lock) |
2832 | printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n", | |
2833 | H_NO(cmd)); | |
2834 | ||
2835 | NCR5380_print_status(cmd->device->host); | |
2836 | ||
2837 | /* get in phase */ | |
2838 | NCR5380_write(TARGET_COMMAND_REG, | |
2839 | PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); | |
2840 | /* assert RST */ | |
2841 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); | |
2842 | udelay(40); | |
2843 | /* reset NCR registers */ | |
2844 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); | |
2845 | NCR5380_write(MODE_REG, MR_BASE); | |
2846 | NCR5380_write(TARGET_COMMAND_REG, 0); | |
2847 | NCR5380_write(SELECT_ENABLE_REG, 0); | |
2848 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get | |
2849 | * through anymore ... */ | |
2850 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); | |
2851 | ||
2b0f834c MS |
2852 | /* MSch 20140115 - looking at the generic NCR5380 driver, all of this |
2853 | * should go. | |
2854 | * Catch-22: if we don't clear all queues, the SCSI driver lock will | |
2855 | * not be reset by atari_scsi_reset()! | |
2856 | */ | |
2857 | ||
2858 | #if defined(RESET_RUN_DONE) | |
2859 | /* XXX Should now be done by midlevel code, but it's broken XXX */ | |
c28bda25 RZ |
2860 | /* XXX see below XXX */ |
2861 | ||
2862 | /* MSch: old-style reset: actually abort all command processing here */ | |
2863 | ||
2864 | /* After the reset, there are no more connected or disconnected commands | |
2865 | * and no busy units; to avoid problems with re-inserting the commands | |
2866 | * into the issue_queue (via scsi_done()), the aborted commands are | |
2867 | * remembered in local variables first. | |
2868 | */ | |
2869 | local_irq_save(flags); | |
2870 | connected = (Scsi_Cmnd *)hostdata->connected; | |
2871 | hostdata->connected = NULL; | |
2872 | disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue; | |
2873 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2874 | #ifdef SUPPORT_TAGS |
c28bda25 | 2875 | free_all_tags(); |
1da177e4 | 2876 | #endif |
c28bda25 RZ |
2877 | for (i = 0; i < 8; ++i) |
2878 | hostdata->busy[i] = 0; | |
1da177e4 | 2879 | #ifdef REAL_DMA |
c28bda25 | 2880 | hostdata->dma_len = 0; |
1da177e4 | 2881 | #endif |
c28bda25 | 2882 | local_irq_restore(flags); |
1da177e4 | 2883 | |
c28bda25 RZ |
2884 | /* In order to tell the mid-level code which commands were aborted, |
2885 | * set the command status to DID_RESET and call scsi_done() !!! | |
2886 | * This ultimately aborts processing of these commands in the mid-level. | |
2887 | */ | |
1da177e4 | 2888 | |
c28bda25 | 2889 | if ((cmd = connected)) { |
d65e634a | 2890 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 RZ |
2891 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2892 | cmd->scsi_done(cmd); | |
2893 | } | |
1da177e4 | 2894 | |
c28bda25 RZ |
2895 | for (i = 0; (cmd = disconnected_queue); ++i) { |
2896 | disconnected_queue = NEXT(cmd); | |
3130d905 | 2897 | SET_NEXT(cmd, NULL); |
c28bda25 RZ |
2898 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
2899 | cmd->scsi_done(cmd); | |
2900 | } | |
2901 | if (i > 0) | |
d65e634a | 2902 | dprintk(NDEBUG_ABORT, "scsi: reset aborted %d disconnected command(s)\n", i); |
1da177e4 | 2903 | |
c28bda25 RZ |
2904 | /* The Falcon lock should be released after a reset... |
2905 | */ | |
2906 | /* ++guenther: moved to atari_scsi_reset(), to prevent a race between | |
2907 | * unlocking and enabling dma interrupt. | |
2908 | */ | |
2909 | /* falcon_release_lock_if_possible( hostdata );*/ | |
1da177e4 | 2910 | |
c28bda25 RZ |
2911 | /* since all commands have been explicitly terminated, we need to tell |
2912 | * the midlevel code that the reset was SUCCESSFUL, and there is no | |
2913 | * need to 'wake up' the commands by a request_sense | |
2914 | */ | |
2b0f834c | 2915 | return SUCCESS; |
1da177e4 LT |
2916 | #else /* 1 */ |
2917 | ||
c28bda25 RZ |
2918 | /* MSch: new-style reset handling: let the mid-level do what it can */ |
2919 | ||
2920 | /* ++guenther: MID-LEVEL IS STILL BROKEN. | |
2921 | * Mid-level is supposed to requeue all commands that were active on the | |
2922 | * various low-level queues. In fact it does this, but that's not enough | |
2923 | * because all these commands are subject to timeout. And if a timeout | |
2924 | * happens for any removed command, *_abort() is called but all queues | |
2925 | * are now empty. Abort then gives up the falcon lock, which is fatal, | |
2926 | * since the mid-level will queue more commands and must have the lock | |
2927 | * (it's all happening inside timer interrupt handler!!). | |
2928 | * Even worse, abort will return NOT_RUNNING for all those commands not | |
2929 | * on any queue, so they won't be retried ... | |
2930 | * | |
2931 | * Conclusion: either scsi.c disables timeout for all resetted commands | |
2932 | * immediately, or we lose! As of linux-2.0.20 it doesn't. | |
2933 | */ | |
2934 | ||
2935 | /* After the reset, there are no more connected or disconnected commands | |
2936 | * and no busy units; so clear the low-level status here to avoid | |
2937 | * conflicts when the mid-level code tries to wake up the affected | |
2938 | * commands! | |
2939 | */ | |
2940 | ||
2941 | if (hostdata->issue_queue) | |
d65e634a | 2942 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
c28bda25 | 2943 | if (hostdata->connected) |
d65e634a | 2944 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
c28bda25 | 2945 | if (hostdata->disconnected_queue) |
d65e634a | 2946 | dprintk(NDEBUG_ABORT, "scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
c28bda25 RZ |
2947 | |
2948 | local_irq_save(flags); | |
2949 | hostdata->issue_queue = NULL; | |
2950 | hostdata->connected = NULL; | |
2951 | hostdata->disconnected_queue = NULL; | |
1da177e4 | 2952 | #ifdef SUPPORT_TAGS |
c28bda25 | 2953 | free_all_tags(); |
1da177e4 | 2954 | #endif |
c28bda25 RZ |
2955 | for (i = 0; i < 8; ++i) |
2956 | hostdata->busy[i] = 0; | |
1da177e4 | 2957 | #ifdef REAL_DMA |
c28bda25 | 2958 | hostdata->dma_len = 0; |
1da177e4 | 2959 | #endif |
c28bda25 | 2960 | local_irq_restore(flags); |
1da177e4 | 2961 | |
c28bda25 | 2962 | /* we did no complete reset of all commands, so a wakeup is required */ |
2b0f834c | 2963 | return SUCCESS; |
1da177e4 LT |
2964 | #endif /* 1 */ |
2965 | } |