Commit | Line | Data |
---|---|---|
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 | 30 | void 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 |
38 | u8 ide_read_error(ide_drive_t *drive) |
39 | { | |
22aa4b32 | 40 | struct ide_cmd cmd; |
92eb4380 | 41 | |
22aa4b32 | 42 | memset(&cmd, 0, sizeof(cmd)); |
67625119 | 43 | cmd.tf_flags = IDE_TFLAG_IN_ERROR; |
92eb4380 | 44 | |
22aa4b32 | 45 | drive->hwif->tp_ops->tf_read(drive, &cmd); |
92eb4380 | 46 | |
22aa4b32 | 47 | return cmd.tf.error; |
92eb4380 BZ |
48 | } |
49 | EXPORT_SYMBOL_GPL(ide_read_error); | |
50 | ||
4dde4492 | 51 | void 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 | 72 | void 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 |
95 | EXPORT_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 |
108 | static 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 |
167 | int 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 |
188 | EXPORT_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 | 199 | int 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 |
208 | EXPORT_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 | */ |
216 | static 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 | 232 | u8 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 | ||
261 | no_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 | 275 | int 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 |
303 | out_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 | 311 | int 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; |
4dde4492 | 315 | u16 *id = drive->id, i; |
89613e66 | 316 | int error = 0; |
1da177e4 | 317 | u8 stat; |
22aa4b32 | 318 | struct ide_cmd cmd; |
1da177e4 | 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 | |
22aa4b32 BZ |
350 | memset(&cmd, 0, sizeof(cmd)); |
351 | cmd.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT; | |
352 | cmd.tf.feature = SETFEATURES_XFER; | |
353 | cmd.tf.nsect = speed; | |
59be2c80 | 354 | |
22aa4b32 | 355 | tp_ops->tf_load(drive, &cmd); |
59be2c80 | 356 | |
aaaade3f | 357 | tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); |
59be2c80 | 358 | |
81ca6919 | 359 | if (drive->quirk_list == 2) |
ecf3a31d | 360 | tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); |
1da177e4 | 361 | |
74af21cf | 362 | error = __ide_wait_stat(drive, drive->ready_stat, |
3a7d2484 | 363 | ATA_BUSY | ATA_DRQ | ATA_ERR, |
74af21cf | 364 | WAIT_CMD, &stat); |
1da177e4 LT |
365 | |
366 | SELECT_MASK(drive, 0); | |
367 | ||
368 | enable_irq(hwif->irq); | |
369 | ||
370 | if (error) { | |
371 | (void) ide_dump_status(drive, "set_drive_speed_status", stat); | |
372 | return error; | |
373 | } | |
374 | ||
c4199930 SS |
375 | if (speed >= XFER_SW_DMA_0) { |
376 | id[ATA_ID_UDMA_MODES] &= ~0xFF00; | |
377 | id[ATA_ID_MWDMA_MODES] &= ~0x0700; | |
378 | id[ATA_ID_SWDMA_MODES] &= ~0x0700; | |
74638c84 SS |
379 | if (ata_id_is_cfa(id)) |
380 | id[ATA_ID_CFA_MODES] &= ~0x0E00; | |
381 | } else if (ata_id_is_cfa(id)) | |
382 | id[ATA_ID_CFA_MODES] &= ~0x01C0; | |
1da177e4 | 383 | |
89613e66 | 384 | skip: |
1da177e4 | 385 | #ifdef CONFIG_BLK_DEV_IDEDMA |
97100fc8 | 386 | if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) |
5e37bdc0 BZ |
387 | hwif->dma_ops->dma_host_set(drive, 1); |
388 | else if (hwif->dma_ops) /* check if host supports DMA */ | |
4a546e04 | 389 | ide_dma_off_quietly(drive); |
1da177e4 LT |
390 | #endif |
391 | ||
4dde4492 BZ |
392 | if (speed >= XFER_UDMA_0) { |
393 | i = 1 << (speed - XFER_UDMA_0); | |
394 | id[ATA_ID_UDMA_MODES] |= (i << 8 | i); | |
74638c84 SS |
395 | } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) { |
396 | i = speed - XFER_MW_DMA_2; | |
397 | id[ATA_ID_CFA_MODES] |= i << 9; | |
4dde4492 BZ |
398 | } else if (speed >= XFER_MW_DMA_0) { |
399 | i = 1 << (speed - XFER_MW_DMA_0); | |
400 | id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); | |
401 | } else if (speed >= XFER_SW_DMA_0) { | |
402 | i = 1 << (speed - XFER_SW_DMA_0); | |
403 | id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); | |
74638c84 SS |
404 | } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) { |
405 | i = speed - XFER_PIO_4; | |
406 | id[ATA_ID_CFA_MODES] |= i << 6; | |
1da177e4 | 407 | } |
4dde4492 | 408 | |
1da177e4 LT |
409 | if (!drive->init_speed) |
410 | drive->init_speed = speed; | |
411 | drive->current_speed = speed; | |
412 | return error; | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /* |
416 | * This should get invoked any time we exit the driver to | |
417 | * wait for an interrupt response from a drive. handler() points | |
418 | * at the appropriate code to handle the next interrupt, and a | |
419 | * timer is started to prevent us from waiting forever in case | |
420 | * something goes wrong (see the ide_timer_expiry() handler later on). | |
421 | * | |
422 | * See also ide_execute_command | |
423 | */ | |
327fa1c2 | 424 | void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, |
60c0cd02 | 425 | unsigned int timeout) |
1da177e4 | 426 | { |
b65fac32 BZ |
427 | ide_hwif_t *hwif = drive->hwif; |
428 | ||
429 | BUG_ON(hwif->handler); | |
430 | hwif->handler = handler; | |
b65fac32 BZ |
431 | hwif->timer.expires = jiffies + timeout; |
432 | hwif->req_gen_timer = hwif->req_gen; | |
433 | add_timer(&hwif->timer); | |
1da177e4 LT |
434 | } |
435 | ||
60c0cd02 BZ |
436 | void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, |
437 | unsigned int timeout) | |
1da177e4 | 438 | { |
b65fac32 | 439 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 440 | unsigned long flags; |
2a2ca6a9 | 441 | |
b65fac32 | 442 | spin_lock_irqsave(&hwif->lock, flags); |
60c0cd02 | 443 | __ide_set_handler(drive, handler, timeout); |
b65fac32 | 444 | spin_unlock_irqrestore(&hwif->lock, flags); |
1da177e4 | 445 | } |
1da177e4 | 446 | EXPORT_SYMBOL(ide_set_handler); |
122f06f8 | 447 | |
1da177e4 LT |
448 | /** |
449 | * ide_execute_command - execute an IDE command | |
450 | * @drive: IDE drive to issue the command against | |
35b5d0be | 451 | * @cmd: command |
1da177e4 LT |
452 | * @handler: handler for next phase |
453 | * @timeout: timeout for command | |
1da177e4 LT |
454 | * |
455 | * Helper function to issue an IDE command. This handles the | |
122f06f8 | 456 | * atomicity requirements, command timing and ensures that the |
1da177e4 LT |
457 | * handler and IRQ setup do not race. All IDE command kick off |
458 | * should go via this function or do equivalent locking. | |
459 | */ | |
cd2a2d96 | 460 | |
35b5d0be BZ |
461 | void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd, |
462 | ide_handler_t *handler, unsigned timeout) | |
1da177e4 | 463 | { |
2a2ca6a9 | 464 | ide_hwif_t *hwif = drive->hwif; |
1da177e4 | 465 | unsigned long flags; |
629f944b | 466 | |
b65fac32 | 467 | spin_lock_irqsave(&hwif->lock, flags); |
35b5d0be BZ |
468 | if ((cmd->protocol != ATAPI_PROT_DMA && |
469 | cmd->protocol != ATAPI_PROT_PIO) || | |
470 | (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT)) | |
471 | __ide_set_handler(drive, handler, timeout); | |
472 | hwif->tp_ops->exec_command(hwif, cmd->tf.command); | |
629f944b BZ |
473 | /* |
474 | * Drive takes 400nS to respond, we must avoid the IRQ being | |
475 | * serviced before that. | |
476 | * | |
477 | * FIXME: we could skip this delay with care on non shared devices | |
478 | */ | |
1da177e4 | 479 | ndelay(400); |
b65fac32 | 480 | spin_unlock_irqrestore(&hwif->lock, flags); |
1da177e4 | 481 | } |
1da177e4 | 482 | |
1da177e4 LT |
483 | /* |
484 | * ide_wait_not_busy() waits for the currently selected device on the hwif | |
9d501529 | 485 | * to report a non-busy status, see comments in ide_probe_port(). |
1da177e4 LT |
486 | */ |
487 | int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) | |
488 | { | |
489 | u8 stat = 0; | |
490 | ||
122f06f8 | 491 | while (timeout--) { |
1da177e4 LT |
492 | /* |
493 | * Turn this into a schedule() sleep once I'm sure | |
494 | * about locking issues (2.5 work ?). | |
495 | */ | |
496 | mdelay(1); | |
374e042c | 497 | stat = hwif->tp_ops->read_status(hwif); |
3a7d2484 | 498 | if ((stat & ATA_BUSY) == 0) |
1da177e4 LT |
499 | return 0; |
500 | /* | |
501 | * Assume a value of 0xff means nothing is connected to | |
502 | * the interface and it doesn't implement the pull-down | |
503 | * resistor on D7. | |
504 | */ | |
505 | if (stat == 0xff) | |
506 | return -ENODEV; | |
6842f8c8 | 507 | touch_softlockup_watchdog(); |
1e86240f | 508 | touch_nmi_watchdog(); |
1da177e4 LT |
509 | } |
510 | return -EBUSY; | |
511 | } |