ide: refactor tf_load() method
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ide / ide-iops.c
CommitLineData
1da177e4 1/*
1da177e4 2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
ccd32e22 3 * Copyright (C) 2003 Red Hat
1da177e4
LT
4 *
5 */
6
1da177e4
LT
7#include <linux/module.h>
8#include <linux/types.h>
9#include <linux/string.h>
10#include <linux/kernel.h>
11#include <linux/timer.h>
12#include <linux/mm.h>
13#include <linux/interrupt.h>
14#include <linux/major.h>
15#include <linux/errno.h>
16#include <linux/genhd.h>
17#include <linux/blkpg.h>
18#include <linux/slab.h>
19#include <linux/pci.h>
20#include <linux/delay.h>
1da177e4
LT
21#include <linux/ide.h>
22#include <linux/bitops.h>
1e86240f 23#include <linux/nmi.h>
1da177e4
LT
24
25#include <asm/byteorder.h>
26#include <asm/irq.h>
27#include <asm/uaccess.h>
28#include <asm/io.h>
29
ed4af48f 30void SELECT_MASK(ide_drive_t *drive, int mask)
1da177e4 31{
ac95beed
BZ
32 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
33
34 if (port_ops && port_ops->maskproc)
35 port_ops->maskproc(drive, mask);
1da177e4
LT
36}
37
92eb4380
BZ
38u8 ide_read_error(ide_drive_t *drive)
39{
22aa4b32 40 struct ide_cmd cmd;
92eb4380 41
22aa4b32 42 memset(&cmd, 0, sizeof(cmd));
60f85019 43 cmd.valid.in.tf = IDE_VALID_ERROR;
92eb4380 44
22aa4b32 45 drive->hwif->tp_ops->tf_read(drive, &cmd);
92eb4380 46
22aa4b32 47 return cmd.tf.error;
92eb4380
BZ
48}
49EXPORT_SYMBOL_GPL(ide_read_error);
50
4dde4492 51void ide_fix_driveid(u16 *id)
1da177e4
LT
52{
53#ifndef __LITTLE_ENDIAN
54# ifdef __BIG_ENDIAN
55 int i;
5b90e990 56
48fb2688 57 for (i = 0; i < 256; i++)
5b90e990 58 id[i] = __le16_to_cpu(id[i]);
1da177e4
LT
59# else
60# error "Please fix <asm/byteorder.h>"
61# endif
62#endif
63}
64
01745112
BZ
65/*
66 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
67 * removing leading/trailing blanks and compressing internal blanks.
68 * It is primarily used to tidy up the model name/number fields as
aaaade3f 69 * returned by the ATA_CMD_ID_ATA[PI] commands.
01745112
BZ
70 */
71
122f06f8 72void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
1da177e4 73{
1a7809e3 74 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
1da177e4
LT
75
76 if (byteswap) {
77 /* convert from big-endian to host byte order */
1a7809e3
LT
78 for (p = s ; p != end ; p += 2)
79 be16_to_cpus((u16 *) p);
1da177e4 80 }
1a7809e3 81
1da177e4 82 /* strip leading blanks */
1a7809e3 83 p = s;
1da177e4
LT
84 while (s != end && *s == ' ')
85 ++s;
86 /* compress internal blanks and strip trailing blanks */
87 while (s != end && *s) {
88 if (*s++ != ' ' || (s != end && *s && *s != ' '))
89 *p++ = *(s-1);
90 }
91 /* wipe out trailing garbage */
92 while (p != end)
93 *p++ = '\0';
94}
1da177e4
LT
95EXPORT_SYMBOL(ide_fixstring);
96
1da177e4
LT
97/*
98 * This routine busy-waits for the drive status to be not "busy".
99 * It then checks the status for all of the "good" bits and none
100 * of the "bad" bits, and if all is okay it returns 0. All other
74af21cf 101 * cases return error -- caller may then invoke ide_error().
1da177e4
LT
102 *
103 * This routine should get fixed to not hog the cpu during extra long waits..
104 * That could be done by busy-waiting for the first jiffy or two, and then
105 * setting a timer to wake up at half second intervals thereafter,
106 * until timeout is achieved, before timing out.
107 */
122f06f8
BZ
108static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
109 unsigned long timeout, u8 *rstat)
1da177e4 110{
b73c7ee2 111 ide_hwif_t *hwif = drive->hwif;
374e042c 112 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
1da177e4 113 unsigned long flags;
74af21cf
BZ
114 int i;
115 u8 stat;
1da177e4
LT
116
117 udelay(1); /* spec allows drive 400ns to assert "BUSY" */
374e042c 118 stat = tp_ops->read_status(hwif);
c47137a9 119
3a7d2484 120 if (stat & ATA_BUSY) {
9b896033 121 local_save_flags(flags);
54cc1428 122 local_irq_enable_in_hardirq();
1da177e4 123 timeout += jiffies;
3a7d2484 124 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
1da177e4
LT
125 if (time_after(jiffies, timeout)) {
126 /*
127 * One last read after the timeout in case
128 * heavy interrupt load made us not make any
129 * progress during the timeout..
130 */
374e042c 131 stat = tp_ops->read_status(hwif);
3a7d2484 132 if ((stat & ATA_BUSY) == 0)
1da177e4
LT
133 break;
134
135 local_irq_restore(flags);
74af21cf
BZ
136 *rstat = stat;
137 return -EBUSY;
1da177e4
LT
138 }
139 }
140 local_irq_restore(flags);
141 }
142 /*
143 * Allow status to settle, then read it again.
144 * A few rare drives vastly violate the 400ns spec here,
145 * so we'll wait up to 10usec for a "good" status
146 * rather than expensively fail things immediately.
147 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
148 */
149 for (i = 0; i < 10; i++) {
150 udelay(1);
374e042c 151 stat = tp_ops->read_status(hwif);
c47137a9
BZ
152
153 if (OK_STAT(stat, good, bad)) {
74af21cf 154 *rstat = stat;
1da177e4 155 return 0;
74af21cf 156 }
1da177e4 157 }
74af21cf
BZ
158 *rstat = stat;
159 return -EFAULT;
160}
161
162/*
163 * In case of error returns error value after doing "*startstop = ide_error()".
164 * The caller should return the updated value of "startstop" in this case,
165 * "startstop" is unchanged when the function returns 0.
166 */
122f06f8
BZ
167int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good,
168 u8 bad, unsigned long timeout)
74af21cf
BZ
169{
170 int err;
171 u8 stat;
172
173 /* bail early if we've exceeded max_failures */
174 if (drive->max_failures && (drive->failures > drive->max_failures)) {
175 *startstop = ide_stopped;
176 return 1;
177 }
178
179 err = __ide_wait_stat(drive, good, bad, timeout, &stat);
180
181 if (err) {
182 char *s = (err == -EBUSY) ? "status timeout" : "status error";
183 *startstop = ide_error(drive, s, stat);
184 }
185
186 return err;
1da177e4 187}
1da177e4
LT
188EXPORT_SYMBOL(ide_wait_stat);
189
a5b7e70d
BZ
190/**
191 * ide_in_drive_list - look for drive in black/white list
192 * @id: drive identifier
4dde4492 193 * @table: list to inspect
a5b7e70d
BZ
194 *
195 * Look for a drive in the blacklist and the whitelist tables
196 * Returns 1 if the drive is found in the table.
197 */
198
4dde4492 199int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
a5b7e70d 200{
4dde4492
BZ
201 for ( ; table->id_model; table++)
202 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
203 (!table->id_firmware ||
204 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
a5b7e70d
BZ
205 return 1;
206 return 0;
207}
b0244a00
BZ
208EXPORT_SYMBOL_GPL(ide_in_drive_list);
209
a5b7e70d
BZ
210/*
211 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
212 * We list them here and depend on the device side cable detection for them.
8588a2b7
BZ
213 *
214 * Some optical devices with the buggy firmwares have the same problem.
a5b7e70d
BZ
215 */
216static const struct drive_list_entry ivb_list[] = {
217 { "QUANTUM FIREBALLlct10 05" , "A03.0900" },
8588a2b7 218 { "TSSTcorp CDDVDW SH-S202J" , "SB00" },
e97564f3
PM
219 { "TSSTcorp CDDVDW SH-S202J" , "SB01" },
220 { "TSSTcorp CDDVDW SH-S202N" , "SB00" },
221 { "TSSTcorp CDDVDW SH-S202N" , "SB01" },
3ced5c49
AS
222 { "TSSTcorp CDDVDW SH-S202H" , "SB00" },
223 { "TSSTcorp CDDVDW SH-S202H" , "SB01" },
c7b997b3 224 { "SAMSUNG SP0822N" , "WA100-10" },
a5b7e70d
BZ
225 { NULL , NULL }
226};
227
1da177e4
LT
228/*
229 * All hosts that use the 80c ribbon must use!
230 * The name is derived from upper byte of word 93 and the 80c ribbon.
231 */
122f06f8 232u8 eighty_ninty_three(ide_drive_t *drive)
1da177e4 233{
7f8f48af 234 ide_hwif_t *hwif = drive->hwif;
4dde4492 235 u16 *id = drive->id;
a5b7e70d 236 int ivb = ide_in_drive_list(id, ivb_list);
7f8f48af 237
49521f97
BZ
238 if (hwif->cbl == ATA_CBL_PATA40_SHORT)
239 return 1;
240
a5b7e70d
BZ
241 if (ivb)
242 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
243 drive->name);
244
367d7e78 245 if (ata_id_is_sata(id) && !ivb)
b98f8803
GK
246 return 1;
247
a5b7e70d 248 if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
7f8f48af 249 goto no_80w;
1a1276e7 250
f68d9320
BZ
251 /*
252 * FIXME:
f367bed0 253 * - change master/slave IDENTIFY order
a5b7e70d 254 * - force bit13 (80c cable present) check also for !ivb devices
f68d9320
BZ
255 * (unless the slave device is pre-ATA3)
256 */
4dde4492
BZ
257 if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
258 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
7f8f48af
BZ
259 return 1;
260
261no_80w:
97100fc8 262 if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
7f8f48af
BZ
263 return 0;
264
265 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
266 "limiting max speed to UDMA33\n",
49521f97
BZ
267 drive->name,
268 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
7f8f48af 269
97100fc8 270 drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;
7f8f48af
BZ
271
272 return 0;
1da177e4
LT
273}
274
8a455134 275int ide_driveid_update(ide_drive_t *drive)
1da177e4 276{
4dde4492 277 u16 *id;
2ebe1d9e 278 int rc;
2f40c9b0
BZ
279
280 id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
281 if (id == NULL)
282 return 0;
1da177e4 283
1da177e4 284 SELECT_MASK(drive, 1);
2ebe1d9e
BZ
285 rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
286 SELECT_MASK(drive, 0);
2f40c9b0 287
2ebe1d9e 288 if (rc)
2f40c9b0 289 goto out_err;
f323b80d 290
4dde4492
BZ
291 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
292 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
293 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
74638c84 294 drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES];
4dde4492
BZ
295 /* anything more ? */
296
297 kfree(id);
298
97100fc8 299 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
4dde4492 300 ide_dma_off(drive);
1da177e4
LT
301
302 return 1;
2f40c9b0
BZ
303out_err:
304 SELECT_MASK(drive, 0);
305 if (rc == 2)
306 printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
307 kfree(id);
308 return 0;
1da177e4
LT
309}
310
74af21cf 311int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
1da177e4 312{
74af21cf 313 ide_hwif_t *hwif = drive->hwif;
374e042c 314 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
c9ff9e7b 315 struct ide_taskfile tf;
4dde4492 316 u16 *id = drive->id, i;
89613e66 317 int error = 0;
1da177e4
LT
318 u8 stat;
319
1da177e4 320#ifdef CONFIG_BLK_DEV_IDEDMA
5e37bdc0
BZ
321 if (hwif->dma_ops) /* check if host supports DMA */
322 hwif->dma_ops->dma_host_set(drive, 0);
1da177e4
LT
323#endif
324
89613e66 325 /* Skip setting PIO flow-control modes on pre-EIDE drives */
48fb2688 326 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
89613e66
SS
327 goto skip;
328
1da177e4
LT
329 /*
330 * Don't use ide_wait_cmd here - it will
331 * attempt to set_geometry and recalibrate,
332 * but for some reason these don't work at
333 * this point (lost interrupt).
334 */
ee1b1cc9 335
1da177e4
LT
336 /*
337 * FIXME: we race against the running IRQ here if
338 * this is called from non IRQ context. If we use
339 * disable_irq() we hang on the error path. Work
340 * is needed.
341 */
ee1b1cc9
BZ
342 disable_irq_nosync(hwif->irq);
343
1da177e4 344 udelay(1);
fdd88f0a 345 tp_ops->dev_select(drive);
e5403bff 346 SELECT_MASK(drive, 1);
1da177e4 347 udelay(1);
ecf3a31d 348 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
59be2c80 349
c9ff9e7b
SS
350 memset(&tf, 0, sizeof(tf));
351 tf.feature = SETFEATURES_XFER;
352 tf.nsect = speed;
59be2c80 353
c9ff9e7b 354 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
59be2c80 355
aaaade3f 356 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
59be2c80 357
81ca6919 358 if (drive->quirk_list == 2)
ecf3a31d 359 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
1da177e4 360
74af21cf 361 error = __ide_wait_stat(drive, drive->ready_stat,
3a7d2484 362 ATA_BUSY | ATA_DRQ | ATA_ERR,
74af21cf 363 WAIT_CMD, &stat);
1da177e4
LT
364
365 SELECT_MASK(drive, 0);
366
367 enable_irq(hwif->irq);
368
369 if (error) {
370 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
371 return error;
372 }
373
c4199930
SS
374 if (speed >= XFER_SW_DMA_0) {
375 id[ATA_ID_UDMA_MODES] &= ~0xFF00;
376 id[ATA_ID_MWDMA_MODES] &= ~0x0700;
377 id[ATA_ID_SWDMA_MODES] &= ~0x0700;
74638c84
SS
378 if (ata_id_is_cfa(id))
379 id[ATA_ID_CFA_MODES] &= ~0x0E00;
380 } else if (ata_id_is_cfa(id))
381 id[ATA_ID_CFA_MODES] &= ~0x01C0;
1da177e4 382
89613e66 383 skip:
1da177e4 384#ifdef CONFIG_BLK_DEV_IDEDMA
97100fc8 385 if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
5e37bdc0
BZ
386 hwif->dma_ops->dma_host_set(drive, 1);
387 else if (hwif->dma_ops) /* check if host supports DMA */
4a546e04 388 ide_dma_off_quietly(drive);
1da177e4
LT
389#endif
390
4dde4492
BZ
391 if (speed >= XFER_UDMA_0) {
392 i = 1 << (speed - XFER_UDMA_0);
393 id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
74638c84
SS
394 } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
395 i = speed - XFER_MW_DMA_2;
396 id[ATA_ID_CFA_MODES] |= i << 9;
4dde4492
BZ
397 } else if (speed >= XFER_MW_DMA_0) {
398 i = 1 << (speed - XFER_MW_DMA_0);
399 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
400 } else if (speed >= XFER_SW_DMA_0) {
401 i = 1 << (speed - XFER_SW_DMA_0);
402 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
74638c84
SS
403 } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
404 i = speed - XFER_PIO_4;
405 id[ATA_ID_CFA_MODES] |= i << 6;
1da177e4 406 }
4dde4492 407
1da177e4
LT
408 if (!drive->init_speed)
409 drive->init_speed = speed;
410 drive->current_speed = speed;
411 return error;
412}
413
1da177e4
LT
414/*
415 * This should get invoked any time we exit the driver to
416 * wait for an interrupt response from a drive. handler() points
417 * at the appropriate code to handle the next interrupt, and a
418 * timer is started to prevent us from waiting forever in case
419 * something goes wrong (see the ide_timer_expiry() handler later on).
420 *
421 * See also ide_execute_command
422 */
327fa1c2 423void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
60c0cd02 424 unsigned int timeout)
1da177e4 425{
b65fac32
BZ
426 ide_hwif_t *hwif = drive->hwif;
427
428 BUG_ON(hwif->handler);
429 hwif->handler = handler;
b65fac32
BZ
430 hwif->timer.expires = jiffies + timeout;
431 hwif->req_gen_timer = hwif->req_gen;
432 add_timer(&hwif->timer);
1da177e4
LT
433}
434
60c0cd02
BZ
435void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
436 unsigned int timeout)
1da177e4 437{
b65fac32 438 ide_hwif_t *hwif = drive->hwif;
1da177e4 439 unsigned long flags;
2a2ca6a9 440
b65fac32 441 spin_lock_irqsave(&hwif->lock, flags);
60c0cd02 442 __ide_set_handler(drive, handler, timeout);
b65fac32 443 spin_unlock_irqrestore(&hwif->lock, flags);
1da177e4 444}
1da177e4 445EXPORT_SYMBOL(ide_set_handler);
122f06f8 446
1da177e4
LT
447/**
448 * ide_execute_command - execute an IDE command
449 * @drive: IDE drive to issue the command against
35b5d0be 450 * @cmd: command
1da177e4
LT
451 * @handler: handler for next phase
452 * @timeout: timeout for command
1da177e4
LT
453 *
454 * Helper function to issue an IDE command. This handles the
122f06f8 455 * atomicity requirements, command timing and ensures that the
1da177e4
LT
456 * handler and IRQ setup do not race. All IDE command kick off
457 * should go via this function or do equivalent locking.
458 */
cd2a2d96 459
35b5d0be
BZ
460void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd,
461 ide_handler_t *handler, unsigned timeout)
1da177e4 462{
2a2ca6a9 463 ide_hwif_t *hwif = drive->hwif;
1da177e4 464 unsigned long flags;
629f944b 465
b65fac32 466 spin_lock_irqsave(&hwif->lock, flags);
35b5d0be
BZ
467 if ((cmd->protocol != ATAPI_PROT_DMA &&
468 cmd->protocol != ATAPI_PROT_PIO) ||
469 (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
470 __ide_set_handler(drive, handler, timeout);
471 hwif->tp_ops->exec_command(hwif, cmd->tf.command);
629f944b
BZ
472 /*
473 * Drive takes 400nS to respond, we must avoid the IRQ being
474 * serviced before that.
475 *
476 * FIXME: we could skip this delay with care on non shared devices
477 */
1da177e4 478 ndelay(400);
b65fac32 479 spin_unlock_irqrestore(&hwif->lock, flags);
1da177e4 480}
1da177e4 481
1da177e4
LT
482/*
483 * ide_wait_not_busy() waits for the currently selected device on the hwif
9d501529 484 * to report a non-busy status, see comments in ide_probe_port().
1da177e4
LT
485 */
486int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
487{
488 u8 stat = 0;
489
122f06f8 490 while (timeout--) {
1da177e4
LT
491 /*
492 * Turn this into a schedule() sleep once I'm sure
493 * about locking issues (2.5 work ?).
494 */
495 mdelay(1);
374e042c 496 stat = hwif->tp_ops->read_status(hwif);
3a7d2484 497 if ((stat & ATA_BUSY) == 0)
1da177e4
LT
498 return 0;
499 /*
500 * Assume a value of 0xff means nothing is connected to
501 * the interface and it doesn't implement the pull-down
502 * resistor on D7.
503 */
504 if (stat == 0xff)
505 return -ENODEV;
6842f8c8 506 touch_softlockup_watchdog();
1e86240f 507 touch_nmi_watchdog();
1da177e4
LT
508 }
509 return -EBUSY;
510}