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Commit | Line | Data |
---|---|---|
594c16d8 BZ |
1 | /* |
2 | * ATAPI support. | |
3 | */ | |
4 | ||
5 | #include <linux/kernel.h> | |
6 | #include <linux/delay.h> | |
7 | #include <linux/ide.h> | |
646c0cb6 BZ |
8 | #include <scsi/scsi.h> |
9 | ||
10 | #ifdef DEBUG | |
11 | #define debug_log(fmt, args...) \ | |
12 | printk(KERN_INFO "ide: " fmt, ## args) | |
13 | #else | |
14 | #define debug_log(fmt, args...) do {} while (0) | |
15 | #endif | |
16 | ||
51509eec BZ |
17 | /* |
18 | * Check whether we can support a device, | |
19 | * based on the ATAPI IDENTIFY command results. | |
20 | */ | |
21 | int ide_check_atapi_device(ide_drive_t *drive, const char *s) | |
22 | { | |
23 | u16 *id = drive->id; | |
24 | u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; | |
25 | ||
26 | *((u16 *)&gcw) = id[ATA_ID_CONFIG]; | |
27 | ||
28 | protocol = (gcw[1] & 0xC0) >> 6; | |
29 | device_type = gcw[1] & 0x1F; | |
30 | removable = (gcw[0] & 0x80) >> 7; | |
31 | drq_type = (gcw[0] & 0x60) >> 5; | |
32 | packet_size = gcw[0] & 0x03; | |
33 | ||
34 | #ifdef CONFIG_PPC | |
35 | /* kludge for Apple PowerBook internal zip */ | |
36 | if (drive->media == ide_floppy && device_type == 5 && | |
37 | !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && | |
38 | strstr((char *)&id[ATA_ID_PROD], "ZIP")) | |
39 | device_type = 0; | |
40 | #endif | |
41 | ||
42 | if (protocol != 2) | |
43 | printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", | |
44 | s, drive->name, protocol); | |
45 | else if ((drive->media == ide_floppy && device_type != 0) || | |
46 | (drive->media == ide_tape && device_type != 1)) | |
47 | printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", | |
48 | s, drive->name, device_type); | |
49 | else if (removable == 0) | |
50 | printk(KERN_ERR "%s: %s: the removable flag is not set\n", | |
51 | s, drive->name); | |
52 | else if (drive->media == ide_floppy && drq_type == 3) | |
53 | printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " | |
54 | "supported\n", s, drive->name, drq_type); | |
55 | else if (packet_size != 0) | |
56 | printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " | |
57 | "bytes\n", s, drive->name, packet_size); | |
58 | else | |
59 | return 1; | |
60 | return 0; | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(ide_check_atapi_device); | |
63 | ||
acaa0f5f BZ |
64 | /* PIO data transfer routine using the scatter gather table. */ |
65 | int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
66 | unsigned int bcount, int write) | |
67 | { | |
68 | ide_hwif_t *hwif = drive->hwif; | |
69 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; | |
70 | xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data; | |
71 | struct scatterlist *sg = pc->sg; | |
72 | char *buf; | |
73 | int count, done = 0; | |
74 | ||
75 | while (bcount) { | |
76 | count = min(sg->length - pc->b_count, bcount); | |
77 | ||
78 | if (PageHighMem(sg_page(sg))) { | |
79 | unsigned long flags; | |
80 | ||
81 | local_irq_save(flags); | |
82 | buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset; | |
83 | xf(drive, NULL, buf + pc->b_count, count); | |
84 | kunmap_atomic(buf - sg->offset, KM_IRQ0); | |
85 | local_irq_restore(flags); | |
86 | } else { | |
87 | buf = sg_virt(sg); | |
88 | xf(drive, NULL, buf + pc->b_count, count); | |
89 | } | |
90 | ||
91 | bcount -= count; | |
92 | pc->b_count += count; | |
93 | done += count; | |
94 | ||
95 | if (pc->b_count == sg->length) { | |
96 | if (!--pc->sg_cnt) | |
97 | break; | |
98 | pc->sg = sg = sg_next(sg); | |
99 | pc->b_count = 0; | |
100 | } | |
101 | } | |
102 | ||
103 | if (bcount) { | |
104 | printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name, | |
105 | bcount, write ? "padding with zeros" | |
106 | : "discarding data"); | |
107 | ide_pad_transfer(drive, write, bcount); | |
108 | } | |
109 | ||
110 | return done; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(ide_io_buffers); | |
113 | ||
7bf7420a BZ |
114 | void ide_init_pc(struct ide_atapi_pc *pc) |
115 | { | |
116 | memset(pc, 0, sizeof(*pc)); | |
117 | pc->buf = pc->pc_buf; | |
118 | pc->buf_size = IDE_PC_BUFFER_SIZE; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(ide_init_pc); | |
121 | ||
7645c151 BZ |
122 | /* |
123 | * Generate a new packet command request in front of the request queue, before | |
124 | * the current request, so that it will be processed immediately, on the next | |
125 | * pass through the driver. | |
126 | */ | |
127 | void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk, | |
128 | struct ide_atapi_pc *pc, struct request *rq) | |
129 | { | |
130 | blk_rq_init(NULL, rq); | |
131 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
132 | rq->cmd_flags |= REQ_PREEMPT; | |
133 | rq->buffer = (char *)pc; | |
134 | rq->rq_disk = disk; | |
135 | memcpy(rq->cmd, pc->c, 12); | |
136 | if (drive->media == ide_tape) | |
137 | rq->cmd[13] = REQ_IDETAPE_PC1; | |
138 | ide_do_drive_cmd(drive, rq); | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(ide_queue_pc_head); | |
141 | ||
646c0cb6 BZ |
142 | /* TODO: unify the code thus making some arguments go away */ |
143 | ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
144 | ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry, | |
145 | void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *), | |
146 | void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *), | |
acaa0f5f | 147 | int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int)) |
646c0cb6 BZ |
148 | { |
149 | ide_hwif_t *hwif = drive->hwif; | |
8fccf899 | 150 | struct request *rq = hwif->hwgroup->rq; |
374e042c | 151 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
646c0cb6 BZ |
152 | xfer_func_t *xferfunc; |
153 | unsigned int temp; | |
154 | u16 bcount; | |
155 | u8 stat, ireason, scsi = drive->scsi; | |
156 | ||
157 | debug_log("Enter %s - interrupt handler\n", __func__); | |
158 | ||
159 | if (pc->flags & PC_FLAG_TIMEDOUT) { | |
db9d2869 | 160 | drive->pc_callback(drive); |
646c0cb6 BZ |
161 | return ide_stopped; |
162 | } | |
163 | ||
164 | /* Clear the interrupt */ | |
374e042c | 165 | stat = tp_ops->read_status(hwif); |
646c0cb6 BZ |
166 | |
167 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
168 | if (hwif->dma_ops->dma_end(drive) || | |
3a7d2484 | 169 | (drive->media == ide_tape && !scsi && (stat & ATA_ERR))) { |
646c0cb6 BZ |
170 | if (drive->media == ide_floppy && !scsi) |
171 | printk(KERN_ERR "%s: DMA %s error\n", | |
172 | drive->name, rq_data_dir(pc->rq) | |
173 | ? "write" : "read"); | |
174 | pc->flags |= PC_FLAG_DMA_ERROR; | |
175 | } else { | |
176 | pc->xferred = pc->req_xfer; | |
177 | if (update_buffers) | |
178 | update_buffers(drive, pc); | |
179 | } | |
180 | debug_log("%s: DMA finished\n", drive->name); | |
181 | } | |
182 | ||
183 | /* No more interrupts */ | |
3a7d2484 | 184 | if ((stat & ATA_DRQ) == 0) { |
646c0cb6 BZ |
185 | debug_log("Packet command completed, %d bytes transferred\n", |
186 | pc->xferred); | |
187 | ||
188 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
189 | ||
190 | local_irq_enable_in_hardirq(); | |
191 | ||
192 | if (drive->media == ide_tape && !scsi && | |
3a7d2484 BZ |
193 | (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE) |
194 | stat &= ~ATA_ERR; | |
8fccf899 | 195 | |
3a7d2484 | 196 | if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
646c0cb6 BZ |
197 | /* Error detected */ |
198 | debug_log("%s: I/O error\n", drive->name); | |
199 | ||
200 | if (drive->media != ide_tape || scsi) { | |
201 | pc->rq->errors++; | |
202 | if (scsi) | |
203 | goto cmd_finished; | |
204 | } | |
205 | ||
8fccf899 | 206 | if (rq->cmd[0] == REQUEST_SENSE) { |
646c0cb6 BZ |
207 | printk(KERN_ERR "%s: I/O error in request sense" |
208 | " command\n", drive->name); | |
209 | return ide_do_reset(drive); | |
210 | } | |
211 | ||
8fccf899 | 212 | debug_log("[cmd %x]: check condition\n", rq->cmd[0]); |
646c0cb6 BZ |
213 | |
214 | /* Retry operation */ | |
215 | retry_pc(drive); | |
8fccf899 | 216 | |
646c0cb6 BZ |
217 | /* queued, but not started */ |
218 | return ide_stopped; | |
219 | } | |
220 | cmd_finished: | |
221 | pc->error = 0; | |
222 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && | |
3a7d2484 | 223 | (stat & ATA_DSC) == 0) { |
646c0cb6 BZ |
224 | dsc_handle(drive); |
225 | return ide_stopped; | |
226 | } | |
8fccf899 | 227 | |
646c0cb6 | 228 | /* Command finished - Call the callback function */ |
db9d2869 | 229 | drive->pc_callback(drive); |
8fccf899 | 230 | |
646c0cb6 BZ |
231 | return ide_stopped; |
232 | } | |
233 | ||
234 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { | |
235 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; | |
236 | printk(KERN_ERR "%s: The device wants to issue more interrupts " | |
237 | "in DMA mode\n", drive->name); | |
238 | ide_dma_off(drive); | |
239 | return ide_do_reset(drive); | |
240 | } | |
646c0cb6 | 241 | |
1823649b BZ |
242 | /* Get the number of bytes to transfer on this interrupt. */ |
243 | ide_read_bcount_and_ireason(drive, &bcount, &ireason); | |
646c0cb6 | 244 | |
3a7d2484 | 245 | if (ireason & ATAPI_COD) { |
646c0cb6 BZ |
246 | printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); |
247 | return ide_do_reset(drive); | |
248 | } | |
8fccf899 | 249 | |
3a7d2484 BZ |
250 | if (((ireason & ATAPI_IO) == ATAPI_IO) == |
251 | !!(pc->flags & PC_FLAG_WRITING)) { | |
646c0cb6 BZ |
252 | /* Hopefully, we will never get here */ |
253 | printk(KERN_ERR "%s: We wanted to %s, but the device wants us " | |
254 | "to %s!\n", drive->name, | |
3a7d2484 BZ |
255 | (ireason & ATAPI_IO) ? "Write" : "Read", |
256 | (ireason & ATAPI_IO) ? "Read" : "Write"); | |
646c0cb6 BZ |
257 | return ide_do_reset(drive); |
258 | } | |
8fccf899 | 259 | |
646c0cb6 BZ |
260 | if (!(pc->flags & PC_FLAG_WRITING)) { |
261 | /* Reading - Check that we have enough space */ | |
262 | temp = pc->xferred + bcount; | |
263 | if (temp > pc->req_xfer) { | |
264 | if (temp > pc->buf_size) { | |
265 | printk(KERN_ERR "%s: The device wants to send " | |
266 | "us more data than expected - " | |
267 | "discarding data\n", | |
268 | drive->name); | |
269 | if (scsi) | |
270 | temp = pc->buf_size - pc->xferred; | |
271 | else | |
272 | temp = 0; | |
273 | if (temp) { | |
274 | if (pc->sg) | |
275 | io_buffers(drive, pc, temp, 0); | |
276 | else | |
374e042c | 277 | tp_ops->input_data(drive, NULL, |
646c0cb6 BZ |
278 | pc->cur_pos, temp); |
279 | printk(KERN_ERR "%s: transferred %d of " | |
280 | "%d bytes\n", | |
281 | drive->name, | |
282 | temp, bcount); | |
283 | } | |
284 | pc->xferred += temp; | |
285 | pc->cur_pos += temp; | |
286 | ide_pad_transfer(drive, 0, bcount - temp); | |
287 | ide_set_handler(drive, handler, timeout, | |
288 | expiry); | |
289 | return ide_started; | |
290 | } | |
291 | debug_log("The device wants to send us more data than " | |
292 | "expected - allowing transfer\n"); | |
293 | } | |
374e042c | 294 | xferfunc = tp_ops->input_data; |
646c0cb6 | 295 | } else |
374e042c | 296 | xferfunc = tp_ops->output_data; |
646c0cb6 BZ |
297 | |
298 | if ((drive->media == ide_floppy && !scsi && !pc->buf) || | |
299 | (drive->media == ide_tape && !scsi && pc->bh) || | |
acaa0f5f BZ |
300 | (scsi && pc->sg)) { |
301 | int done = io_buffers(drive, pc, bcount, | |
302 | !!(pc->flags & PC_FLAG_WRITING)); | |
303 | ||
304 | /* FIXME: don't do partial completions */ | |
305 | if (drive->media == ide_floppy && !scsi) | |
306 | ide_end_request(drive, 1, done >> 9); | |
307 | } else | |
646c0cb6 BZ |
308 | xferfunc(drive, NULL, pc->cur_pos, bcount); |
309 | ||
310 | /* Update the current position */ | |
311 | pc->xferred += bcount; | |
312 | pc->cur_pos += bcount; | |
313 | ||
314 | debug_log("[cmd %x] transferred %d bytes on that intr.\n", | |
8fccf899 | 315 | rq->cmd[0], bcount); |
646c0cb6 BZ |
316 | |
317 | /* And set the interrupt handler again */ | |
318 | ide_set_handler(drive, handler, timeout, expiry); | |
319 | return ide_started; | |
320 | } | |
321 | EXPORT_SYMBOL_GPL(ide_pc_intr); | |
594c16d8 | 322 | |
88a72109 BZ |
323 | static u8 ide_read_ireason(ide_drive_t *drive) |
324 | { | |
325 | ide_task_t task; | |
326 | ||
327 | memset(&task, 0, sizeof(task)); | |
328 | task.tf_flags = IDE_TFLAG_IN_NSECT; | |
329 | ||
374e042c | 330 | drive->hwif->tp_ops->tf_read(drive, &task); |
88a72109 BZ |
331 | |
332 | return task.tf.nsect & 3; | |
333 | } | |
334 | ||
594c16d8 BZ |
335 | static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) |
336 | { | |
594c16d8 BZ |
337 | int retries = 100; |
338 | ||
3a7d2484 BZ |
339 | while (retries-- && ((ireason & ATAPI_COD) == 0 || |
340 | (ireason & ATAPI_IO))) { | |
594c16d8 BZ |
341 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " |
342 | "a packet command, retrying\n", drive->name); | |
343 | udelay(100); | |
88a72109 | 344 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
345 | if (retries == 0) { |
346 | printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " | |
347 | "a packet command, ignoring\n", | |
348 | drive->name); | |
3a7d2484 BZ |
349 | ireason |= ATAPI_COD; |
350 | ireason &= ~ATAPI_IO; | |
594c16d8 BZ |
351 | } |
352 | } | |
353 | ||
354 | return ireason; | |
355 | } | |
356 | ||
357 | ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
358 | ide_handler_t *handler, unsigned int timeout, | |
359 | ide_expiry_t *expiry) | |
360 | { | |
361 | ide_hwif_t *hwif = drive->hwif; | |
8fccf899 | 362 | struct request *rq = hwif->hwgroup->rq; |
594c16d8 BZ |
363 | ide_startstop_t startstop; |
364 | u8 ireason; | |
365 | ||
3a7d2484 | 366 | if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { |
594c16d8 BZ |
367 | printk(KERN_ERR "%s: Strange, packet command initiated yet " |
368 | "DRQ isn't asserted\n", drive->name); | |
369 | return startstop; | |
370 | } | |
371 | ||
88a72109 | 372 | ireason = ide_read_ireason(drive); |
594c16d8 BZ |
373 | if (drive->media == ide_tape && !drive->scsi) |
374 | ireason = ide_wait_ireason(drive, ireason); | |
375 | ||
3a7d2484 | 376 | if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { |
594c16d8 BZ |
377 | printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " |
378 | "a packet command\n", drive->name); | |
379 | return ide_do_reset(drive); | |
380 | } | |
381 | ||
382 | /* Set the interrupt routine */ | |
383 | ide_set_handler(drive, handler, timeout, expiry); | |
384 | ||
385 | /* Begin DMA, if necessary */ | |
386 | if (pc->flags & PC_FLAG_DMA_OK) { | |
387 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; | |
388 | hwif->dma_ops->dma_start(drive); | |
389 | } | |
390 | ||
391 | /* Send the actual packet */ | |
ea68d270 | 392 | if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) |
8fccf899 | 393 | hwif->tp_ops->output_data(drive, NULL, rq->cmd, 12); |
594c16d8 BZ |
394 | |
395 | return ide_started; | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(ide_transfer_pc); | |
6bf1641c BZ |
398 | |
399 | ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
400 | ide_handler_t *handler, unsigned int timeout, | |
401 | ide_expiry_t *expiry) | |
402 | { | |
403 | ide_hwif_t *hwif = drive->hwif; | |
404 | u16 bcount; | |
405 | u8 dma = 0; | |
406 | ||
407 | /* We haven't transferred any data yet */ | |
408 | pc->xferred = 0; | |
409 | pc->cur_pos = pc->buf; | |
410 | ||
411 | /* Request to transfer the entire buffer at once */ | |
412 | if (drive->media == ide_tape && !drive->scsi) | |
413 | bcount = pc->req_xfer; | |
414 | else | |
415 | bcount = min(pc->req_xfer, 63 * 1024); | |
416 | ||
417 | if (pc->flags & PC_FLAG_DMA_ERROR) { | |
418 | pc->flags &= ~PC_FLAG_DMA_ERROR; | |
419 | ide_dma_off(drive); | |
420 | } | |
421 | ||
422 | if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma) { | |
423 | if (drive->scsi) | |
424 | hwif->sg_mapped = 1; | |
425 | dma = !hwif->dma_ops->dma_setup(drive); | |
426 | if (drive->scsi) | |
427 | hwif->sg_mapped = 0; | |
428 | } | |
429 | ||
430 | if (!dma) | |
431 | pc->flags &= ~PC_FLAG_DMA_OK; | |
432 | ||
433 | ide_pktcmd_tf_load(drive, drive->scsi ? 0 : IDE_TFLAG_OUT_DEVICE, | |
434 | bcount, dma); | |
435 | ||
436 | /* Issue the packet command */ | |
ac77ef8b | 437 | if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { |
aaaade3f | 438 | ide_execute_command(drive, ATA_CMD_PACKET, handler, |
6bf1641c BZ |
439 | timeout, NULL); |
440 | return ide_started; | |
441 | } else { | |
442 | ide_execute_pkt_cmd(drive); | |
443 | return (*handler)(drive); | |
444 | } | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(ide_issue_pc); |