blob: 7201b176d75b05814665096ab45fe372900fbe99 [file] [log] [blame]
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>
Geert Uytterhoeven479edf02009-03-31 20:14:57 +02009#include <linux/scatterlist.h>
10
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +020011#include <scsi/scsi.h>
12
13#ifdef DEBUG
14#define debug_log(fmt, args...) \
15 printk(KERN_INFO "ide: " fmt, ## args)
16#else
17#define debug_log(fmt, args...) do {} while (0)
18#endif
19
Borislav Petkov8c662852009-01-02 16:12:54 +010020#define ATAPI_MIN_CDB_BYTES 12
21
Borislav Petkov991cb262009-01-02 16:12:52 +010022static inline int dev_is_idecd(ide_drive_t *drive)
23{
Borislav Petkov53174642009-01-02 16:12:54 +010024 return drive->media == ide_cdrom || drive->media == ide_optical;
Borislav Petkov991cb262009-01-02 16:12:52 +010025}
26
Bartlomiej Zolnierkiewicz51509ee2008-10-10 22:39:34 +020027/*
28 * Check whether we can support a device,
29 * based on the ATAPI IDENTIFY command results.
30 */
31int ide_check_atapi_device(ide_drive_t *drive, const char *s)
32{
33 u16 *id = drive->id;
34 u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
35
36 *((u16 *)&gcw) = id[ATA_ID_CONFIG];
37
38 protocol = (gcw[1] & 0xC0) >> 6;
39 device_type = gcw[1] & 0x1F;
40 removable = (gcw[0] & 0x80) >> 7;
41 drq_type = (gcw[0] & 0x60) >> 5;
42 packet_size = gcw[0] & 0x03;
43
44#ifdef CONFIG_PPC
45 /* kludge for Apple PowerBook internal zip */
46 if (drive->media == ide_floppy && device_type == 5 &&
47 !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
48 strstr((char *)&id[ATA_ID_PROD], "ZIP"))
49 device_type = 0;
50#endif
51
52 if (protocol != 2)
53 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
54 s, drive->name, protocol);
55 else if ((drive->media == ide_floppy && device_type != 0) ||
56 (drive->media == ide_tape && device_type != 1))
57 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
58 s, drive->name, device_type);
59 else if (removable == 0)
60 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
61 s, drive->name);
62 else if (drive->media == ide_floppy && drq_type == 3)
63 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
64 "supported\n", s, drive->name, drq_type);
65 else if (packet_size != 0)
66 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
67 "bytes\n", s, drive->name, packet_size);
68 else
69 return 1;
70 return 0;
71}
72EXPORT_SYMBOL_GPL(ide_check_atapi_device);
73
Bartlomiej Zolnierkiewicz7bf74202008-10-10 22:39:37 +020074void ide_init_pc(struct ide_atapi_pc *pc)
75{
76 memset(pc, 0, sizeof(*pc));
77 pc->buf = pc->pc_buf;
78 pc->buf_size = IDE_PC_BUFFER_SIZE;
79}
80EXPORT_SYMBOL_GPL(ide_init_pc);
81
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +020082/*
83 * Generate a new packet command request in front of the request queue, before
84 * the current request, so that it will be processed immediately, on the next
85 * pass through the driver.
86 */
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +020087static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
88 struct ide_atapi_pc *pc, struct request *rq)
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +020089{
90 blk_rq_init(NULL, rq);
91 rq->cmd_type = REQ_TYPE_SPECIAL;
92 rq->cmd_flags |= REQ_PREEMPT;
93 rq->buffer = (char *)pc;
94 rq->rq_disk = disk;
Borislav Petkov3eb76c12009-03-13 21:16:12 +010095
96 if (pc->req_xfer) {
97 rq->data = pc->buf;
98 rq->data_len = pc->req_xfer;
99 }
100
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200101 memcpy(rq->cmd, pc->c, 12);
102 if (drive->media == ide_tape)
103 rq->cmd[13] = REQ_IDETAPE_PC1;
Bartlomiej Zolnierkiewicz18660822009-03-24 23:22:44 +0100104
105 drive->hwif->rq = NULL;
106
107 elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200108}
Bartlomiej Zolnierkiewicz7645c152008-10-10 22:39:37 +0200109
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200110/*
111 * Add a special packet command request to the tail of the request queue,
112 * and wait for it to be serviced.
113 */
114int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
115 struct ide_atapi_pc *pc)
116{
117 struct request *rq;
118 int error;
119
120 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
121 rq->cmd_type = REQ_TYPE_SPECIAL;
122 rq->buffer = (char *)pc;
Borislav Petkov3eb76c12009-03-13 21:16:12 +0100123
124 if (pc->req_xfer) {
125 rq->data = pc->buf;
126 rq->data_len = pc->req_xfer;
127 }
128
Bartlomiej Zolnierkiewicz2ac07d92008-10-10 22:39:38 +0200129 memcpy(rq->cmd, pc->c, 12);
130 if (drive->media == ide_tape)
131 rq->cmd[13] = REQ_IDETAPE_PC1;
132 error = blk_execute_rq(drive->queue, disk, rq, 0);
133 blk_put_request(rq);
134
135 return error;
136}
137EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
138
Bartlomiej Zolnierkiewiczde699ad2008-10-10 22:39:39 +0200139int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
140{
141 struct ide_atapi_pc pc;
142
143 ide_init_pc(&pc);
144 pc.c[0] = TEST_UNIT_READY;
145
146 return ide_queue_pc_tail(drive, disk, &pc);
147}
148EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
149
Bartlomiej Zolnierkiewicz0c8a6c72008-10-10 22:39:39 +0200150int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
151{
152 struct ide_atapi_pc pc;
153
154 ide_init_pc(&pc);
155 pc.c[0] = START_STOP;
156 pc.c[4] = start;
157
158 if (drive->media == ide_tape)
159 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
160
161 return ide_queue_pc_tail(drive, disk, &pc);
162}
163EXPORT_SYMBOL_GPL(ide_do_start_stop);
164
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200165int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
166{
167 struct ide_atapi_pc pc;
168
Bartlomiej Zolnierkiewicz42619d32008-10-17 18:09:11 +0200169 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
Bartlomiej Zolnierkiewicz05780422008-10-10 22:39:38 +0200170 return 0;
171
172 ide_init_pc(&pc);
173 pc.c[0] = ALLOW_MEDIUM_REMOVAL;
174 pc.c[4] = on;
175
176 return ide_queue_pc_tail(drive, disk, &pc);
177}
178EXPORT_SYMBOL_GPL(ide_set_media_lock);
179
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200180void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
181{
182 ide_init_pc(pc);
183 pc->c[0] = REQUEST_SENSE;
184 if (drive->media == ide_floppy) {
185 pc->c[4] = 255;
186 pc->req_xfer = 18;
187 } else {
188 pc->c[4] = 20;
189 pc->req_xfer = 20;
190 }
191}
192EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
193
194/*
195 * Called when an error was detected during the last packet command.
196 * We queue a request sense packet command in the head of the request list.
197 */
198void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
199{
200 struct request *rq = &drive->request_sense_rq;
201 struct ide_atapi_pc *pc = &drive->request_sense_pc;
202
203 (void)ide_read_error(drive);
204 ide_create_request_sense_cmd(drive, pc);
205 if (drive->media == ide_tape)
206 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
207 ide_queue_pc_head(drive, disk, pc, rq);
208}
209EXPORT_SYMBOL_GPL(ide_retry_pc);
210
Borislav Petkov4cad0852009-01-02 16:12:53 +0100211int ide_cd_expiry(ide_drive_t *drive)
212{
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100213 struct request *rq = drive->hwif->rq;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100214 unsigned long wait = 0;
215
216 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
217
218 /*
219 * Some commands are *slow* and normally take a long time to complete.
220 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
221 * commands/drives support that. Let ide_timer_expiry keep polling us
222 * for these.
223 */
224 switch (rq->cmd[0]) {
225 case GPCMD_BLANK:
226 case GPCMD_FORMAT_UNIT:
227 case GPCMD_RESERVE_RZONE_TRACK:
228 case GPCMD_CLOSE_TRACK:
229 case GPCMD_FLUSH_CACHE:
230 wait = ATAPI_WAIT_PC;
231 break;
232 default:
233 if (!(rq->cmd_flags & REQ_QUIET))
234 printk(KERN_INFO "cmd 0x%x timed out\n",
235 rq->cmd[0]);
236 wait = 0;
237 break;
238 }
239 return wait;
240}
241EXPORT_SYMBOL_GPL(ide_cd_expiry);
242
Borislav Petkov392de1d2009-01-02 16:12:52 +0100243int ide_cd_get_xferlen(struct request *rq)
244{
245 if (blk_fs_request(rq))
246 return 32768;
247 else if (blk_sense_request(rq) || blk_pc_request(rq) ||
248 rq->cmd_type == REQ_TYPE_ATA_PC)
249 return rq->data_len;
250 else
251 return 0;
252}
253EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
254
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100255void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
256{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200257 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100258
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200259 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
260 IDE_VALID_LBAM | IDE_VALID_LBAH);
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100261
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200262 *bcount = (tf.lbah << 8) | tf.lbam;
263 *ireason = tf.nsect & 3;
Bartlomiej Zolnierkiewicz0d6a9752009-03-24 23:22:46 +0100264}
265EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
266
Bartlomiej Zolnierkiewiczaa5d2de2008-10-13 21:39:32 +0200267/*
268 * This is the usual interrupt handler which will be called during a packet
269 * command. We will transfer some of the data (as requested by the drive)
270 * and will re-point interrupt handler to us.
271 */
272static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200273{
Bartlomiej Zolnierkiewicz2b9efba2008-10-13 21:39:31 +0200274 struct ide_atapi_pc *pc = drive->pc;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200275 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200276 struct ide_cmd *cmd = &hwif->cmd;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100277 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200278 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200279 xfer_func_t *xferfunc;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200280 unsigned int timeout, done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200281 u16 bcount;
Borislav Petkov5d655a02009-01-02 16:12:54 +0100282 u8 stat, ireason, dsc = 0;
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200283 u8 write = !!(pc->flags & PC_FLAG_WRITING);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200284
285 debug_log("Enter %s - interrupt handler\n", __func__);
286
Borislav Petkov5d655a02009-01-02 16:12:54 +0100287 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
288 : WAIT_TAPE_CMD;
Bartlomiej Zolnierkiewicz844b9462008-10-13 21:39:31 +0200289
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200290 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz374e0422008-07-23 19:55:56 +0200291 stat = tp_ops->read_status(hwif);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200292
293 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200294 int rc;
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200295
Bartlomiej Zolnierkiewicz88b41322009-03-31 20:15:22 +0200296 drive->waiting_for_dma = 0;
297 rc = hwif->dma_ops->dma_end(drive);
Bartlomiej Zolnierkiewiczf094d4d2009-03-31 20:15:24 +0200298 ide_dma_unmap_sg(drive, cmd);
Bartlomiej Zolnierkiewicz44530112009-03-31 20:15:20 +0200299
300 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
Borislav Petkov5d655a02009-01-02 16:12:54 +0100301 if (drive->media == ide_floppy)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200302 printk(KERN_ERR "%s: DMA %s error\n",
303 drive->name, rq_data_dir(pc->rq)
304 ? "write" : "read");
305 pc->flags |= PC_FLAG_DMA_ERROR;
306 } else {
307 pc->xferred = pc->req_xfer;
Bartlomiej Zolnierkiewicz85e39032008-10-13 21:39:32 +0200308 if (drive->pc_update_buffers)
309 drive->pc_update_buffers(drive, pc);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200310 }
311 debug_log("%s: DMA finished\n", drive->name);
312 }
313
314 /* No more interrupts */
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200315 if ((stat & ATA_DRQ) == 0) {
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200316 int uptodate, error;
317 unsigned int done;
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100318
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200319 debug_log("Packet command completed, %d bytes transferred\n",
320 pc->xferred);
321
322 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
323
324 local_irq_enable_in_hardirq();
325
Borislav Petkov5d655a02009-01-02 16:12:54 +0100326 if (drive->media == ide_tape &&
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200327 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
328 stat &= ~ATA_ERR;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200329
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200330 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200331 /* Error detected */
332 debug_log("%s: I/O error\n", drive->name);
333
Borislav Petkov5d655a02009-01-02 16:12:54 +0100334 if (drive->media != ide_tape)
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200335 pc->rq->errors++;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200336
Borislav Petkov8fccf892008-07-23 19:56:01 +0200337 if (rq->cmd[0] == REQUEST_SENSE) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200338 printk(KERN_ERR "%s: I/O error in request sense"
339 " command\n", drive->name);
340 return ide_do_reset(drive);
341 }
342
Borislav Petkov8fccf892008-07-23 19:56:01 +0200343 debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200344
345 /* Retry operation */
Bartlomiej Zolnierkiewicz6b0da282008-10-13 21:39:32 +0200346 ide_retry_pc(drive, rq->rq_disk);
Borislav Petkov8fccf892008-07-23 19:56:01 +0200347
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200348 /* queued, but not started */
349 return ide_stopped;
350 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200351 pc->error = 0;
Bartlomiej Zolnierkiewiczb14c7212008-10-13 21:39:30 +0200352
353 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
354 dsc = 1;
Borislav Petkov8fccf892008-07-23 19:56:01 +0200355
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200356 /* Command finished - Call the callback function */
Bartlomiej Zolnierkiewicz03a2faa2009-03-27 12:46:36 +0100357 uptodate = drive->pc_callback(drive, dsc);
358
359 if (uptodate == 0)
360 drive->failed_pc = NULL;
361
Bartlomiej Zolnierkiewicz6902a532009-03-27 12:46:43 +0100362 if (blk_special_request(rq)) {
363 rq->errors = 0;
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200364 done = blk_rq_bytes(rq);
365 error = 0;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100366 } else {
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200367
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100368 if (blk_fs_request(rq) == 0 && uptodate <= 0) {
369 if (rq->errors == 0)
370 rq->errors = -EIO;
371 }
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200372
373 if (drive->media == ide_tape)
374 done = ide_rq_bytes(rq); /* FIXME */
375 else
376 done = blk_rq_bytes(rq);
377
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200378 error = uptodate ? 0 : -EIO;
Bartlomiej Zolnierkiewicz89f78b32009-03-27 12:46:43 +0100379 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200380
Borislav Petkov5b6c9422009-03-31 20:15:34 +0200381 ide_complete_rq(drive, error, done);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200382 return ide_stopped;
383 }
384
385 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
386 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
387 printk(KERN_ERR "%s: The device wants to issue more interrupts "
388 "in DMA mode\n", drive->name);
389 ide_dma_off(drive);
390 return ide_do_reset(drive);
391 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200392
Bartlomiej Zolnierkiewicz18236492008-07-23 19:55:54 +0200393 /* Get the number of bytes to transfer on this interrupt. */
394 ide_read_bcount_and_ireason(drive, &bcount, &ireason);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200395
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200396 if (ireason & ATAPI_COD) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200397 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
398 return ide_do_reset(drive);
399 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200400
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200401 if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200402 /* Hopefully, we will never get here */
403 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
404 "to %s!\n", drive->name,
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200405 (ireason & ATAPI_IO) ? "Write" : "Read",
406 (ireason & ATAPI_IO) ? "Read" : "Write");
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200407 return ide_do_reset(drive);
408 }
Borislav Petkov8fccf892008-07-23 19:56:01 +0200409
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200410 xferfunc = write ? tp_ops->output_data : tp_ops->input_data;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200411
Bartlomiej Zolnierkiewicz349d12a2009-03-31 20:15:26 +0200412 if (drive->media == ide_floppy && pc->buf == NULL) {
413 done = min_t(unsigned int, bcount, cmd->nleft);
414 ide_pio_bytes(drive, cmd, write, done);
415 } else if (drive->media == ide_tape && pc->bh) {
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200416 done = drive->pc_io_buffers(drive, pc, bcount, write);
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200417 } else {
418 done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
419 xferfunc(drive, NULL, pc->cur_pos, done);
420 }
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200421
422 /* Update the current position */
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200423 pc->xferred += done;
424 pc->cur_pos += done;
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200425
Bartlomiej Zolnierkiewiczd93bc452009-03-31 20:15:26 +0200426 bcount -= done;
427
428 if (bcount)
429 ide_pad_transfer(drive, write, bcount);
430
431 debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
432 rq->cmd[0], done, bcount);
433
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200434 /* And set the interrupt handler again */
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100435 ide_set_handler(drive, ide_pc_intr, timeout);
Bartlomiej Zolnierkiewicz646c0cb2008-07-15 21:22:03 +0200436 return ide_started;
437}
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200438
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200439static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100440 u16 bcount, u8 dma)
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100441{
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200442 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
443 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
444 IDE_VALID_FEATURE | valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100445 cmd->tf.command = ATA_CMD_PACKET;
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100446 cmd->tf.feature = dma; /* Use PIO/DMA */
447 cmd->tf.lbam = bcount & 0xff;
448 cmd->tf.lbah = (bcount >> 8) & 0xff;
Bartlomiej Zolnierkiewicz7a254df2009-03-24 23:22:39 +0100449}
450
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200451static u8 ide_read_ireason(ide_drive_t *drive)
452{
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200453 struct ide_taskfile tf;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200454
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200455 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200456
Sergei Shtylyov3153c262009-04-08 14:13:03 +0200457 return tf.nsect & 3;
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200458}
459
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200460static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
461{
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200462 int retries = 100;
463
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200464 while (retries-- && ((ireason & ATAPI_COD) == 0 ||
465 (ireason & ATAPI_IO))) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200466 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
467 "a packet command, retrying\n", drive->name);
468 udelay(100);
Bartlomiej Zolnierkiewicz88a72102008-07-23 19:55:54 +0200469 ireason = ide_read_ireason(drive);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200470 if (retries == 0) {
471 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
472 "a packet command, ignoring\n",
473 drive->name);
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200474 ireason |= ATAPI_COD;
475 ireason &= ~ATAPI_IO;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200476 }
477 }
478
479 return ireason;
480}
481
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200482static int ide_delayed_transfer_pc(ide_drive_t *drive)
483{
484 /* Send the actual packet */
485 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
486
487 /* Timeout for the packet command */
488 return WAIT_FLOPPY_CMD;
489}
490
491static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200492{
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100493 struct ide_atapi_pc *uninitialized_var(pc);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200494 ide_hwif_t *hwif = drive->hwif;
Bartlomiej Zolnierkiewiczb65fac32009-01-06 17:20:50 +0100495 struct request *rq = hwif->rq;
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200496 ide_expiry_t *expiry;
497 unsigned int timeout;
Borislav Petkov8c662852009-01-02 16:12:54 +0100498 int cmd_len;
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200499 ide_startstop_t startstop;
500 u8 ireason;
501
Bartlomiej Zolnierkiewicz3a7d2482008-10-10 22:39:21 +0200502 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200503 printk(KERN_ERR "%s: Strange, packet command initiated yet "
504 "DRQ isn't asserted\n", drive->name);
505 return startstop;
506 }
507
Borislav Petkov5f258432009-01-02 16:12:53 +0100508 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
509 if (drive->dma)
510 drive->waiting_for_dma = 1;
511 }
512
Borislav Petkov8c662852009-01-02 16:12:54 +0100513 if (dev_is_idecd(drive)) {
514 /* ATAPI commands get padded out to 12 bytes minimum */
515 cmd_len = COMMAND_SIZE(rq->cmd[0]);
516 if (cmd_len < ATAPI_MIN_CDB_BYTES)
517 cmd_len = ATAPI_MIN_CDB_BYTES;
Borislav Petkovdef860d2009-01-02 16:12:55 +0100518
519 timeout = rq->timeout;
520 expiry = ide_cd_expiry;
521 } else {
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100522 pc = drive->pc;
523
Borislav Petkov8c662852009-01-02 16:12:54 +0100524 cmd_len = ATAPI_MIN_CDB_BYTES;
525
Borislav Petkovdef860d2009-01-02 16:12:55 +0100526 /*
527 * If necessary schedule the packet transfer to occur 'timeout'
528 * miliseconds later in ide_delayed_transfer_pc() after the
529 * device says it's ready for a packet.
530 */
531 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
532 timeout = drive->pc_delay;
533 expiry = &ide_delayed_transfer_pc;
534 } else {
535 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
536 : WAIT_TAPE_CMD;
537 expiry = NULL;
538 }
Borislav Petkov06cc2772009-01-02 16:12:56 +0100539
540 ireason = ide_read_ireason(drive);
541 if (drive->media == ide_tape)
542 ireason = ide_wait_ireason(drive, ireason);
543
544 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
545 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
546 "a packet command\n", drive->name);
547
548 return ide_do_reset(drive);
549 }
Bartlomiej Zolnierkiewiczbaf08f02008-10-13 21:39:32 +0200550 }
551
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100552 hwif->expiry = expiry;
553
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200554 /* Set the interrupt routine */
Borislav Petkovd6251d42009-01-06 17:20:58 +0100555 ide_set_handler(drive,
556 (dev_is_idecd(drive) ? drive->irq_handler
557 : ide_pc_intr),
Bartlomiej Zolnierkiewicz60c0cd02009-03-27 12:46:46 +0100558 timeout);
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200559
Borislav Petkov2eba0822009-03-31 20:14:58 +0200560 /* Send the actual packet */
561 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
562 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
563
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200564 /* Begin DMA, if necessary */
Borislav Petkovb16aabc2009-01-02 16:12:56 +0100565 if (dev_is_idecd(drive)) {
566 if (drive->dma)
567 hwif->dma_ops->dma_start(drive);
568 } else {
569 if (pc->flags & PC_FLAG_DMA_OK) {
570 pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
571 hwif->dma_ops->dma_start(drive);
572 }
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200573 }
574
Bartlomiej Zolnierkiewicz594c16d2008-07-15 21:21:58 +0200575 return ide_started;
576}
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200577
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100578ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200579{
Borislav Petkovd77612a2009-01-02 16:12:55 +0100580 struct ide_atapi_pc *pc;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200581 ide_hwif_t *hwif = drive->hwif;
Borislav Petkov4cad0852009-01-02 16:12:53 +0100582 ide_expiry_t *expiry = NULL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100583 struct request *rq = hwif->rq;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100584 unsigned int timeout;
Borislav Petkov392de1d2009-01-02 16:12:52 +0100585 u16 bcount;
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200586 u8 valid_tf;
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100587 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200588
Borislav Petkoved485542009-01-02 16:12:52 +0100589 if (dev_is_idecd(drive)) {
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200590 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
Bartlomiej Zolnierkiewicze6830a82009-03-27 12:46:37 +0100591 bcount = ide_cd_get_xferlen(rq);
Borislav Petkov4cad0852009-01-02 16:12:53 +0100592 expiry = ide_cd_expiry;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100593 timeout = ATAPI_WAIT_PC;
Borislav Petkovd77612a2009-01-02 16:12:55 +0100594
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200595 if (drive->dma)
596 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkoved485542009-01-02 16:12:52 +0100597 } else {
Borislav Petkovd77612a2009-01-02 16:12:55 +0100598 pc = drive->pc;
599
600 /* We haven't transferred any data yet */
601 pc->xferred = 0;
602 pc->cur_pos = pc->buf;
603
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200604 valid_tf = IDE_VALID_DEVICE;
Borislav Petkoved485542009-01-02 16:12:52 +0100605 bcount = ((drive->media == ide_tape) ?
606 pc->req_xfer :
607 min(pc->req_xfer, 63 * 1024));
Borislav Petkovd77612a2009-01-02 16:12:55 +0100608
609 if (pc->flags & PC_FLAG_DMA_ERROR) {
610 pc->flags &= ~PC_FLAG_DMA_ERROR;
611 ide_dma_off(drive);
612 }
613
Bartlomiej Zolnierkiewicz5ae54122009-03-31 20:15:20 +0200614 if (pc->flags & PC_FLAG_DMA_OK)
615 drive->dma = !ide_dma_prepare(drive, cmd);
Borislav Petkovd77612a2009-01-02 16:12:55 +0100616
617 if (!drive->dma)
618 pc->flags &= ~PC_FLAG_DMA_OK;
Borislav Petkov28ad91d2009-01-02 16:12:56 +0100619
620 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
621 : WAIT_TAPE_CMD;
Borislav Petkoved485542009-01-02 16:12:52 +0100622 }
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200623
Sergei Shtylyov60f85012009-04-08 14:13:01 +0200624 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
Bartlomiej Zolnierkiewiczb788ee92009-03-27 12:46:46 +0100625
626 (void)do_rw_taskfile(drive, cmd);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200627
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100628 if (drq_int) {
Borislav Petkov5f258432009-01-02 16:12:53 +0100629 if (drive->dma)
630 drive->waiting_for_dma = 0;
Bartlomiej Zolnierkiewicz22117d62009-03-27 12:46:47 +0100631 hwif->expiry = expiry;
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200632 }
Bartlomiej Zolnierkiewicz35b5d0b2009-03-27 12:46:47 +0100633
634 ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
635
636 return drq_int ? ide_started : ide_transfer_pc(drive);
Bartlomiej Zolnierkiewicz6bf16412008-07-15 21:22:00 +0200637}
638EXPORT_SYMBOL_GPL(ide_issue_pc);