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Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02001/*
2 * ATAPI support.
3 */
4
5#include <linux/kernel.h>
Borislav Petkov4cad0852009-01-02 16:12:53 +01006#include <linux/cdrom.h>
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +02007#include <linux/delay.h>
8#include <linux/ide.h>
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +02009#include <scsi/scsi.h>
10
11#ifdef DEBUG
12#define debug_log(fmt, args...) \
13 printk(KERN_INFO "ide: " fmt, ## args)
14#else
15#define debug_log(fmt, args...) do {} while (0)
16#endif
17
Borislav Petkov8c662852009-01-02 16:12:54 +010018#define ATAPI_MIN_CDB_BYTES 12
19
Borislav Petkov991cb262009-01-02 16:12:52 +010020static inline int dev_is_idecd(ide_drive_t *drive)
21{
Borislav Petkov53174642009-01-02 16:12:54 +010022 return drive->media == ide_cdrom || drive->media == ide_optical;
Borislav Petkov991cb262009-01-02 16:12:52 +010023}
24
Bartlomiej Zolnierkiewicz51509ee2008-10-10 22:39:34 +020025/*
26 * Check whether we can support a device,
27 * based on the ATAPI IDENTIFY command results.
28 */
29int ide_check_atapi_device(ide_drive_t *drive, const char *s)
30{
31 u16 *id = drive->id;
32 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
33
34 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
35
36 protocol = (gcw[1] & 0xC0) >> 6;
37 device_type = gcw[1] & 0x1F;
38 removable = (gcw[0] & 0x80) >> 7;
39 drq_type = (gcw[0] & 0x60) >> 5;
40 packet_size = gcw[0] & 0x03;
41
42#ifdef CONFIG_PPC
43 /* kludge for Apple PowerBook internal zip */
44 if (drive->media == ide_floppy && device_type == 5 &&
45 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
46 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
47 device_type = 0;
48#endif
49
50 if (protocol != 2)
51 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
52 s, drive->name, protocol);
53 else if ((drive->media == ide_floppy && device_type != 0) ||
54 (drive->media == ide_tape && device_type != 1))
55 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
56 s, drive->name, device_type);
57 else if (removable == 0)
58 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
59 s, drive->name);
60 else if (drive->media == ide_floppy && drq_type == 3)
61 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
62 "supported\n", s, drive->name, drq_type);
63 else if (packet_size != 0)
64 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
65 "bytes\n", s, drive->name, packet_size);
66 else
67 return 1;
68 return 0;
69}
70EXPORT_SYMBOL_GPL(ide_check_atapi_device);
71
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +020072/* PIO data transfer routine using the scatter gather table. */
73int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
74 unsigned int bcount, int write)
75{
76 ide_hwif_t *hwif = drive->hwif;
77 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
78 xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
79 struct scatterlist *sg = pc->sg;
80 char *buf;
81 int count, done = 0;
82
83 while (bcount) {
84 count = min(sg->length - pc->b_count, bcount);
85
86 if (PageHighMem(sg_page(sg))) {
87 unsigned long flags;
88
89 local_irq_save(flags);
90 buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
91 xf(drive, NULL, buf + pc->b_count, count);
92 kunmap_atomic(buf - sg->offset, KM_IRQ0);
93 local_irq_restore(flags);
94 } else {
95 buf = sg_virt(sg);
96 xf(drive, NULL, buf + pc->b_count, count);
97 }
98
99 bcount -= count;
100 pc->b_count += count;
101 done += count;
102
103 if (pc->b_count == sg->length) {
104 if (!--pc->sg_cnt)
105 break;
106 pc->sg = sg = sg_next(sg);
107 pc->b_count = 0;
108 }
109 }
110
111 if (bcount) {
112 printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
113 bcount, write ? "padding with zeros"
114 : "discarding data");
115 ide_pad_transfer(drive, write, bcount);
116 }
117
118 return done;
119}
120EXPORT_SYMBOL_GPL(ide_io_buffers);
121
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +0200122void ide_init_pc(struct ide_atapi_pc *pc)
123{
124 memset(pc, 0, sizeof(*pc));
125 pc->buf = pc->pc_buf;
126 pc->buf_size = IDE_PC_BUFFER_SIZE;
127}
128EXPORT_SYMBOL_GPL(ide_init_pc);
129
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200130/*
131 * Generate a new packet command request in front of the request queue, before
132 * the current request, so that it will be processed immediately, on the next
133 * pass through the driver.
134 */
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200135static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
136 struct ide_atapi_pc *pc, struct request *rq)
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200137{
138 blk_rq_init(NULL, rq);
139 rq->cmd_type = REQ_TYPE_SPECIAL;
140 rq->cmd_flags |= REQ_PREEMPT;
141 rq->buffer = (char *)pc;
142 rq->rq_disk = disk;
143 memcpy(rq->cmd, pc->c, 12);
144 if (drive->media == ide_tape)
145 rq->cmd[13] = REQ_IDETAPE_PC1;
146 ide_do_drive_cmd(drive, rq);
147}
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200148
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200149/*
150 * Add a special packet command request to the tail of the request queue,
151 * and wait for it to be serviced.
152 */
153int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
154 struct ide_atapi_pc *pc)
155{
156 struct request *rq;
157 int error;
158
159 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
160 rq->cmd_type = REQ_TYPE_SPECIAL;
161 rq->buffer = (char *)pc;
162 memcpy(rq->cmd, pc->c, 12);
163 if (drive->media == ide_tape)
164 rq->cmd[13] = REQ_IDETAPE_PC1;
165 error = blk_execute_rq(drive->queue, disk, rq, 0);
166 blk_put_request(rq);
167
168 return error;
169}
170EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
171
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200172int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
173{
174 struct ide_atapi_pc pc;
175
176 ide_init_pc(&pc);
177 pc.c[0] = TEST_UNIT_READY;
178
179 return ide_queue_pc_tail(drive, disk, &pc);
180}
181EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
182
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200183int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
184{
185 struct ide_atapi_pc pc;
186
187 ide_init_pc(&pc);
188 pc.c[0] = START_STOP;
189 pc.c[4] = start;
190
191 if (drive->media == ide_tape)
192 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
193
194 return ide_queue_pc_tail(drive, disk, &pc);
195}
196EXPORT_SYMBOL_GPL(ide_do_start_stop);
197
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200198int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
199{
200 struct ide_atapi_pc pc;
201
Bartlomiej Zolnierkiewicz42619d32008-10-17 18:09:11 +0200202 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200203 return 0;
204
205 ide_init_pc(&pc);
206 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
207 pc.c[4] = on;
208
209 return ide_queue_pc_tail(drive, disk, &pc);
210}
211EXPORT_SYMBOL_GPL(ide_set_media_lock);
212
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200213void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
214{
215 ide_init_pc(pc);
216 pc->c[0] = REQUEST_SENSE;
217 if (drive->media == ide_floppy) {
218 pc->c[4] = 255;
219 pc->req_xfer = 18;
220 } else {
221 pc->c[4] = 20;
222 pc->req_xfer = 20;
223 }
224}
225EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
226
227/*
228 * Called when an error was detected during the last packet command.
229 * We queue a request sense packet command in the head of the request list.
230 */
231void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
232{
233 struct request *rq = &drive->request_sense_rq;
234 struct ide_atapi_pc *pc = &drive->request_sense_pc;
235
236 (void)ide_read_error(drive);
237 ide_create_request_sense_cmd(drive, pc);
238 if (drive->media == ide_tape)
239 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
240 ide_queue_pc_head(drive, disk, pc, rq);
241}
242EXPORT_SYMBOL_GPL(ide_retry_pc);
243
Borislav Petkov4cad0852009-01-02 16:12:53 +0100244int ide_cd_expiry(ide_drive_t *drive)
245{
246 struct request *rq = HWGROUP(drive)->rq;
247 unsigned long wait = 0;
248
249 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
250
251 /*
252 * Some commands are *slow* and normally take a long time to complete.
253 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
254 * commands/drives support that. Let ide_timer_expiry keep polling us
255 * for these.
256 */
257 switch (rq->cmd[0]) {
258 case GPCMD_BLANK:
259 case GPCMD_FORMAT_UNIT:
260 case GPCMD_RESERVE_RZONE_TRACK:
261 case GPCMD_CLOSE_TRACK:
262 case GPCMD_FLUSH_CACHE:
263 wait = ATAPI_WAIT_PC;
264 break;
265 default:
266 if (!(rq->cmd_flags & REQ_QUIET))
267 printk(KERN_INFO "cmd 0x%x timed out\n",
268 rq->cmd[0]);
269 wait = 0;
270 break;
271 }
272 return wait;
273}
274EXPORT_SYMBOL_GPL(ide_cd_expiry);
275
Borislav Petkov392de1d2009-01-02 16:12:52 +0100276int ide_cd_get_xferlen(struct request *rq)
277{
278 if (blk_fs_request(rq))
279 return 32768;
280 else if (blk_sense_request(rq) || blk_pc_request(rq) ||
281 rq->cmd_type == REQ_TYPE_ATA_PC)
282 return rq->data_len;
283 else
284 return 0;
285}
286EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
287
Bartlomiej Zolnierkiewiczaa5d2de72008-10-13 21:39:32 +0200288/*
289 * This is the usual interrupt handler which will be called during a packet
290 * command. We will transfer some of the data (as requested by the drive)
291 * and will re-point interrupt handler to us.
292 */
293static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200294{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200295 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200296 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200297 struct request *rq = hwif->hwgroup->rq;
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200298 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200299 xfer_func_t *xferfunc;
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200300 unsigned int timeout, temp;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200301 u16 bcount;
Borislav Petkov5d655a02009-01-02 16:12:54 +0100302 u8 stat, ireason, dsc = 0;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200303
304 debug_log("Enter %s - interrupt handler\n", __func__);
305
Borislav Petkov5d655a02009-01-02 16:12:54 +0100306 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
307 : WAIT_TAPE_CMD;
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200308
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200309 if (pc->flags & PC_FLAG_TIMEDOUT) {
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200310 drive->pc_callback(drive, 0);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200311 return ide_stopped;
312 }
313
314 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200315 stat = tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200316
317 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
318 if (hwif->dma_ops->dma_end(drive) ||
Borislav Petkov5d655a02009-01-02 16:12:54 +0100319 (drive->media == ide_tape && (stat & ATA_ERR))) {
320 if (drive->media == ide_floppy)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200321 printk(KERN_ERR "%s: DMA %s error\n",
322 drive->name, rq_data_dir(pc->rq)
323 ? "write" : "read");
324 pc->flags |= PC_FLAG_DMA_ERROR;
325 } else {
326 pc->xferred = pc->req_xfer;
Bartlomiej Zolnierkiewicz85e39032008-10-13 21:39:32 +0200327 if (drive->pc_update_buffers)
328 drive->pc_update_buffers(drive, pc);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200329 }
330 debug_log("%s: DMA finished\n", drive->name);
331 }
332
333 /* No more interrupts */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200334 if ((stat & ATA_DRQ) == 0) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200335 debug_log("Packet command completed, %d bytes transferred\n",
336 pc->xferred);
337
338 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
339
340 local_irq_enable_in_hardirq();
341
Borislav Petkov5d655a02009-01-02 16:12:54 +0100342 if (drive->media == ide_tape &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200343 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
344 stat &= ~ATA_ERR;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200345
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200346 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200347 /* Error detected */
348 debug_log("%s: I/O error\n", drive->name);
349
Borislav Petkov5d655a02009-01-02 16:12:54 +0100350 if (drive->media != ide_tape)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200351 pc->rq->errors++;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200352
Borislav Petkov8fccf892008-07-23 19:56:01 +0200353 if (rq->cmd[0] == REQUEST_SENSE) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200354 printk(KERN_ERR "%s: I/O error in request sense"
355 " command\n", drive->name);
356 return ide_do_reset(drive);
357 }
358
Borislav Petkov8fccf892008-07-23 19:56:01 +0200359 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200360
361 /* Retry operation */
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200362 ide_retry_pc(drive, rq->rq_disk);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200363
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200364 /* queued, but not started */
365 return ide_stopped;
366 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200367 pc->error = 0;
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200368
369 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
370 dsc = 1;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200371
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200372 /* Command finished - Call the callback function */
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200373 drive->pc_callback(drive, dsc);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200374
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200375 return ide_stopped;
376 }
377
378 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
379 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
380 printk(KERN_ERR "%s: The device wants to issue more interrupts "
381 "in DMA mode\n", drive->name);
382 ide_dma_off(drive);
383 return ide_do_reset(drive);
384 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200385
Bartlomiej Zolnierkiewicz18236492008-07-23 19:55:54 +0200386 /* Get the number of bytes to transfer on this interrupt. */
387 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200388
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200389 if (ireason & ATAPI_COD) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200390 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
391 return ide_do_reset(drive);
392 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200393
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200394 if (((ireason & ATAPI_IO) == ATAPI_IO) ==
395 !!(pc->flags & PC_FLAG_WRITING)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200396 /* Hopefully, we will never get here */
397 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
398 "to %s!\n", drive->name,
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200399 (ireason & ATAPI_IO) ? "Write" : "Read",
400 (ireason & ATAPI_IO) ? "Read" : "Write");
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200401 return ide_do_reset(drive);
402 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200403
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200404 if (!(pc->flags & PC_FLAG_WRITING)) {
405 /* Reading - Check that we have enough space */
406 temp = pc->xferred + bcount;
407 if (temp > pc->req_xfer) {
408 if (temp > pc->buf_size) {
409 printk(KERN_ERR "%s: The device wants to send "
410 "us more data than expected - "
411 "discarding data\n",
412 drive->name);
Borislav Petkov5d655a02009-01-02 16:12:54 +0100413
414 ide_pad_transfer(drive, 0, bcount);
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200415 goto next_irq;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200416 }
417 debug_log("The device wants to send us more data than "
418 "expected - allowing transfer\n");
419 }
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200420 xferfunc = tp_ops->input_data;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200421 } else
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200422 xferfunc = tp_ops->output_data;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200423
Borislav Petkov5d655a02009-01-02 16:12:54 +0100424 if ((drive->media == ide_floppy && !pc->buf) ||
425 (drive->media == ide_tape && pc->bh)) {
Bartlomiej Zolnierkiewicz85e39032008-10-13 21:39:32 +0200426 int done = drive->pc_io_buffers(drive, pc, bcount,
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +0200427 !!(pc->flags & PC_FLAG_WRITING));
428
429 /* FIXME: don't do partial completions */
Borislav Petkov5d655a02009-01-02 16:12:54 +0100430 if (drive->media == ide_floppy)
Bartlomiej Zolnierkiewiczacaa0f52008-10-10 22:39:36 +0200431 ide_end_request(drive, 1, done >> 9);
432 } else
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200433 xferfunc(drive, NULL, pc->cur_pos, bcount);
434
435 /* Update the current position */
436 pc->xferred += bcount;
437 pc->cur_pos += bcount;
438
439 debug_log("[cmd %x] transferred %d bytes on that intr.\n",
Borislav Petkov8fccf892008-07-23 19:56:01 +0200440 rq->cmd[0], bcount);
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200441next_irq:
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200442 /* And set the interrupt handler again */
Borislav Petkov5d655a02009-01-02 16:12:54 +0100443 ide_set_handler(drive, ide_pc_intr, timeout, NULL);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200444 return ide_started;
445}
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200446
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200447static u8 ide_read_ireason(ide_drive_t *drive)
448{
449 ide_task_t task;
450
451 memset(&task, 0, sizeof(task));
452 task.tf_flags = IDE_TFLAG_IN_NSECT;
453
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200454 drive->hwif->tp_ops->tf_read(drive, &task);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200455
456 return task.tf.nsect & 3;
457}
458
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200459static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
460{
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200461 int retries = 100;
462
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200463 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
464 (ireason & ATAPI_IO))) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200465 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
466 "a packet command, retrying\n", drive->name);
467 udelay(100);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200468 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200469 if (retries == 0) {
470 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
471 "a packet command, ignoring\n",
472 drive->name);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200473 ireason |= ATAPI_COD;
474 ireason &= ~ATAPI_IO;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200475 }
476 }
477
478 return ireason;
479}
480
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200481static int ide_delayed_transfer_pc(ide_drive_t *drive)
482{
483 /* Send the actual packet */
484 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
485
486 /* Timeout for the packet command */
487 return WAIT_FLOPPY_CMD;
488}
489
490static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200491{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200492 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200493 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200494 struct request *rq = hwif->hwgroup->rq;
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200495 ide_expiry_t *expiry;
496 unsigned int timeout;
Borislav Petkov8c662852009-01-02 16:12:54 +0100497 int cmd_len;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200498 ide_startstop_t startstop;
499 u8 ireason;
500
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200501 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200502 printk(KERN_ERR "%s: Strange, packet command initiated yet "
503 "DRQ isn't asserted\n", drive->name);
504 return startstop;
505 }
506
Borislav Petkov5f258432009-01-02 16:12:53 +0100507 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
508 if (drive->dma)
509 drive->waiting_for_dma = 1;
510 }
511
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200512 ireason = ide_read_ireason(drive);
Borislav Petkov5fe31102009-01-02 16:12:53 +0100513 if (drive->media == ide_tape)
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200514 ireason = ide_wait_ireason(drive, ireason);
515
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200516 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200517 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
518 "a packet command\n", drive->name);
Borislav Petkov8c662852009-01-02 16:12:54 +0100519
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200520 return ide_do_reset(drive);
521 }
522
Borislav Petkov8c662852009-01-02 16:12:54 +0100523 if (dev_is_idecd(drive)) {
524 /* ATAPI commands get padded out to 12 bytes minimum */
525 cmd_len = COMMAND_SIZE(rq->cmd[0]);
526 if (cmd_len < ATAPI_MIN_CDB_BYTES)
527 cmd_len = ATAPI_MIN_CDB_BYTES;
Borislav Petkovdef860d2009-01-02 16:12:55 +0100528
529 timeout = rq->timeout;
530 expiry = ide_cd_expiry;
531 } else {
Borislav Petkov8c662852009-01-02 16:12:54 +0100532 cmd_len = ATAPI_MIN_CDB_BYTES;
533
Borislav Petkovdef860d2009-01-02 16:12:55 +0100534 /*
535 * If necessary schedule the packet transfer to occur 'timeout'
536 * miliseconds later in ide_delayed_transfer_pc() after the
537 * device says it's ready for a packet.
538 */
539 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
540 timeout = drive->pc_delay;
541 expiry = &ide_delayed_transfer_pc;
542 } else {
543 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
544 : WAIT_TAPE_CMD;
545 expiry = NULL;
546 }
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200547 }
548
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200549 /* Set the interrupt routine */
Bartlomiej Zolnierkiewiczaa5d2de72008-10-13 21:39:32 +0200550 ide_set_handler(drive, ide_pc_intr, timeout, expiry);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200551
552 /* Begin DMA, if necessary */
553 if (pc->flags & PC_FLAG_DMA_OK) {
554 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
555 hwif->dma_ops->dma_start(drive);
556 }
557
558 /* Send the actual packet */
Borislav Petkovea68d272008-07-23 19:56:01 +0200559 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
Borislav Petkov8c662852009-01-02 16:12:54 +0100560 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200561
562 return ide_started;
563}
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200564
Borislav Petkov4cad0852009-01-02 16:12:53 +0100565ide_startstop_t ide_issue_pc(ide_drive_t *drive, unsigned int timeout)
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200566{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200567 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200568 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100569 ide_expiry_t *expiry = NULL;
Borislav Petkovf9476b92008-10-13 21:39:50 +0200570 u32 tf_flags;
Borislav Petkov392de1d2009-01-02 16:12:52 +0100571 u16 bcount;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200572
573 /* We haven't transferred any data yet */
574 pc->xferred = 0;
575 pc->cur_pos = pc->buf;
576
Borislav Petkoved485542009-01-02 16:12:52 +0100577 if (dev_is_idecd(drive)) {
578 tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
Borislav Petkov392de1d2009-01-02 16:12:52 +0100579 bcount = ide_cd_get_xferlen(hwif->hwgroup->rq);
Borislav Petkov4cad0852009-01-02 16:12:53 +0100580 expiry = ide_cd_expiry;
Borislav Petkoved485542009-01-02 16:12:52 +0100581 } else {
582 tf_flags = IDE_TFLAG_OUT_DEVICE;
583 bcount = ((drive->media == ide_tape) ?
584 pc->req_xfer :
585 min(pc->req_xfer, 63 * 1024));
586 }
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200587
588 if (pc->flags & PC_FLAG_DMA_ERROR) {
589 pc->flags &= ~PC_FLAG_DMA_ERROR;
590 ide_dma_off(drive);
591 }
592
Borislav Petkov4f02ff02009-01-02 16:12:52 +0100593 if (((pc->flags & PC_FLAG_DMA_OK) &&
594 (drive->dev_flags & IDE_DFLAG_USING_DMA)) ||
Borislav Petkov152fe1c2009-01-02 16:12:53 +0100595 drive->dma)
Borislav Petkov0a9b6f82008-10-13 21:39:49 +0200596 drive->dma = !hwif->dma_ops->dma_setup(drive);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200597
Borislav Petkov0a9b6f82008-10-13 21:39:49 +0200598 if (!drive->dma)
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200599 pc->flags &= ~PC_FLAG_DMA_OK;
600
Borislav Petkovf9476b92008-10-13 21:39:50 +0200601 ide_pktcmd_tf_load(drive, tf_flags, bcount, drive->dma);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200602
603 /* Issue the packet command */
Borislav Petkovac77ef82008-07-23 19:56:01 +0200604 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
Borislav Petkov5f258432009-01-02 16:12:53 +0100605 if (drive->dma)
606 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200607 ide_execute_command(drive, ATA_CMD_PACKET, ide_transfer_pc,
Borislav Petkov4cad0852009-01-02 16:12:53 +0100608 timeout, expiry);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200609 return ide_started;
610 } else {
611 ide_execute_pkt_cmd(drive);
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200612 return ide_transfer_pc(drive);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200613 }
614}
615EXPORT_SYMBOL_GPL(ide_issue_pc);