| 1 | /* |
| 2 | * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org> |
| 3 | * Copyright (C) 2003 Red Hat |
| 4 | * |
| 5 | */ |
| 6 | |
| 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> |
| 21 | #include <linux/ide.h> |
| 22 | #include <linux/bitops.h> |
| 23 | #include <linux/nmi.h> |
| 24 | |
| 25 | #include <asm/byteorder.h> |
| 26 | #include <asm/irq.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/io.h> |
| 29 | |
| 30 | void SELECT_MASK(ide_drive_t *drive, int mask) |
| 31 | { |
| 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); |
| 36 | } |
| 37 | |
| 38 | u8 ide_read_error(ide_drive_t *drive) |
| 39 | { |
| 40 | struct ide_taskfile tf; |
| 41 | |
| 42 | drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR); |
| 43 | |
| 44 | return tf.error; |
| 45 | } |
| 46 | EXPORT_SYMBOL_GPL(ide_read_error); |
| 47 | |
| 48 | void ide_fix_driveid(u16 *id) |
| 49 | { |
| 50 | #ifndef __LITTLE_ENDIAN |
| 51 | # ifdef __BIG_ENDIAN |
| 52 | int i; |
| 53 | |
| 54 | for (i = 0; i < 256; i++) |
| 55 | id[i] = __le16_to_cpu(id[i]); |
| 56 | # else |
| 57 | # error "Please fix <asm/byteorder.h>" |
| 58 | # endif |
| 59 | #endif |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * ide_fixstring() cleans up and (optionally) byte-swaps a text string, |
| 64 | * removing leading/trailing blanks and compressing internal blanks. |
| 65 | * It is primarily used to tidy up the model name/number fields as |
| 66 | * returned by the ATA_CMD_ID_ATA[PI] commands. |
| 67 | */ |
| 68 | |
| 69 | void ide_fixstring(u8 *s, const int bytecount, const int byteswap) |
| 70 | { |
| 71 | u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ |
| 72 | |
| 73 | if (byteswap) { |
| 74 | /* convert from big-endian to host byte order */ |
| 75 | for (p = s ; p != end ; p += 2) |
| 76 | be16_to_cpus((u16 *) p); |
| 77 | } |
| 78 | |
| 79 | /* strip leading blanks */ |
| 80 | p = s; |
| 81 | while (s != end && *s == ' ') |
| 82 | ++s; |
| 83 | /* compress internal blanks and strip trailing blanks */ |
| 84 | while (s != end && *s) { |
| 85 | if (*s++ != ' ' || (s != end && *s && *s != ' ')) |
| 86 | *p++ = *(s-1); |
| 87 | } |
| 88 | /* wipe out trailing garbage */ |
| 89 | while (p != end) |
| 90 | *p++ = '\0'; |
| 91 | } |
| 92 | EXPORT_SYMBOL(ide_fixstring); |
| 93 | |
| 94 | /* |
| 95 | * This routine busy-waits for the drive status to be not "busy". |
| 96 | * It then checks the status for all of the "good" bits and none |
| 97 | * of the "bad" bits, and if all is okay it returns 0. All other |
| 98 | * cases return error -- caller may then invoke ide_error(). |
| 99 | * |
| 100 | * This routine should get fixed to not hog the cpu during extra long waits.. |
| 101 | * That could be done by busy-waiting for the first jiffy or two, and then |
| 102 | * setting a timer to wake up at half second intervals thereafter, |
| 103 | * until timeout is achieved, before timing out. |
| 104 | */ |
| 105 | int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, |
| 106 | unsigned long timeout, u8 *rstat) |
| 107 | { |
| 108 | ide_hwif_t *hwif = drive->hwif; |
| 109 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 110 | unsigned long flags; |
| 111 | int i; |
| 112 | u8 stat; |
| 113 | |
| 114 | udelay(1); /* spec allows drive 400ns to assert "BUSY" */ |
| 115 | stat = tp_ops->read_status(hwif); |
| 116 | |
| 117 | if (stat & ATA_BUSY) { |
| 118 | local_save_flags(flags); |
| 119 | local_irq_enable_in_hardirq(); |
| 120 | timeout += jiffies; |
| 121 | while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { |
| 122 | if (time_after(jiffies, timeout)) { |
| 123 | /* |
| 124 | * One last read after the timeout in case |
| 125 | * heavy interrupt load made us not make any |
| 126 | * progress during the timeout.. |
| 127 | */ |
| 128 | stat = tp_ops->read_status(hwif); |
| 129 | if ((stat & ATA_BUSY) == 0) |
| 130 | break; |
| 131 | |
| 132 | local_irq_restore(flags); |
| 133 | *rstat = stat; |
| 134 | return -EBUSY; |
| 135 | } |
| 136 | } |
| 137 | local_irq_restore(flags); |
| 138 | } |
| 139 | /* |
| 140 | * Allow status to settle, then read it again. |
| 141 | * A few rare drives vastly violate the 400ns spec here, |
| 142 | * so we'll wait up to 10usec for a "good" status |
| 143 | * rather than expensively fail things immediately. |
| 144 | * This fix courtesy of Matthew Faupel & Niccolo Rigacci. |
| 145 | */ |
| 146 | for (i = 0; i < 10; i++) { |
| 147 | udelay(1); |
| 148 | stat = tp_ops->read_status(hwif); |
| 149 | |
| 150 | if (OK_STAT(stat, good, bad)) { |
| 151 | *rstat = stat; |
| 152 | return 0; |
| 153 | } |
| 154 | } |
| 155 | *rstat = stat; |
| 156 | return -EFAULT; |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * In case of error returns error value after doing "*startstop = ide_error()". |
| 161 | * The caller should return the updated value of "startstop" in this case, |
| 162 | * "startstop" is unchanged when the function returns 0. |
| 163 | */ |
| 164 | int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, |
| 165 | u8 bad, unsigned long timeout) |
| 166 | { |
| 167 | int err; |
| 168 | u8 stat; |
| 169 | |
| 170 | /* bail early if we've exceeded max_failures */ |
| 171 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
| 172 | *startstop = ide_stopped; |
| 173 | return 1; |
| 174 | } |
| 175 | |
| 176 | err = __ide_wait_stat(drive, good, bad, timeout, &stat); |
| 177 | |
| 178 | if (err) { |
| 179 | char *s = (err == -EBUSY) ? "status timeout" : "status error"; |
| 180 | *startstop = ide_error(drive, s, stat); |
| 181 | } |
| 182 | |
| 183 | return err; |
| 184 | } |
| 185 | EXPORT_SYMBOL(ide_wait_stat); |
| 186 | |
| 187 | /** |
| 188 | * ide_in_drive_list - look for drive in black/white list |
| 189 | * @id: drive identifier |
| 190 | * @table: list to inspect |
| 191 | * |
| 192 | * Look for a drive in the blacklist and the whitelist tables |
| 193 | * Returns 1 if the drive is found in the table. |
| 194 | */ |
| 195 | |
| 196 | int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) |
| 197 | { |
| 198 | for ( ; table->id_model; table++) |
| 199 | if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && |
| 200 | (!table->id_firmware || |
| 201 | strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) |
| 202 | return 1; |
| 203 | return 0; |
| 204 | } |
| 205 | EXPORT_SYMBOL_GPL(ide_in_drive_list); |
| 206 | |
| 207 | /* |
| 208 | * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. |
| 209 | * Some optical devices with the buggy firmwares have the same problem. |
| 210 | */ |
| 211 | static const struct drive_list_entry ivb_list[] = { |
| 212 | { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, |
| 213 | { "QUANTUM FIREBALLlct20 30" , "APL.0900" }, |
| 214 | { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, |
| 215 | { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, |
| 216 | { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, |
| 217 | { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, |
| 218 | { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, |
| 219 | { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, |
| 220 | { "SAMSUNG SP0822N" , "WA100-10" }, |
| 221 | { NULL , NULL } |
| 222 | }; |
| 223 | |
| 224 | /* |
| 225 | * All hosts that use the 80c ribbon must use! |
| 226 | * The name is derived from upper byte of word 93 and the 80c ribbon. |
| 227 | */ |
| 228 | u8 eighty_ninty_three(ide_drive_t *drive) |
| 229 | { |
| 230 | ide_hwif_t *hwif = drive->hwif; |
| 231 | u16 *id = drive->id; |
| 232 | int ivb = ide_in_drive_list(id, ivb_list); |
| 233 | |
| 234 | if (hwif->cbl == ATA_CBL_SATA || hwif->cbl == ATA_CBL_PATA40_SHORT) |
| 235 | return 1; |
| 236 | |
| 237 | if (ivb) |
| 238 | printk(KERN_DEBUG "%s: skipping word 93 validity check\n", |
| 239 | drive->name); |
| 240 | |
| 241 | if (ata_id_is_sata(id) && !ivb) |
| 242 | return 1; |
| 243 | |
| 244 | if (hwif->cbl != ATA_CBL_PATA80 && !ivb) |
| 245 | goto no_80w; |
| 246 | |
| 247 | /* |
| 248 | * FIXME: |
| 249 | * - change master/slave IDENTIFY order |
| 250 | * - force bit13 (80c cable present) check also for !ivb devices |
| 251 | * (unless the slave device is pre-ATA3) |
| 252 | */ |
| 253 | if (id[ATA_ID_HW_CONFIG] & 0x4000) |
| 254 | return 1; |
| 255 | |
| 256 | if (ivb) { |
| 257 | const char *model = (char *)&id[ATA_ID_PROD]; |
| 258 | |
| 259 | if (strstr(model, "TSSTcorp CDDVDW SH-S202")) { |
| 260 | /* |
| 261 | * These ATAPI devices always report 80c cable |
| 262 | * so we have to depend on the host in this case. |
| 263 | */ |
| 264 | if (hwif->cbl == ATA_CBL_PATA80) |
| 265 | return 1; |
| 266 | } else { |
| 267 | /* Depend on the device side cable detection. */ |
| 268 | if (id[ATA_ID_HW_CONFIG] & 0x2000) |
| 269 | return 1; |
| 270 | } |
| 271 | } |
| 272 | no_80w: |
| 273 | if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED) |
| 274 | return 0; |
| 275 | |
| 276 | printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " |
| 277 | "limiting max speed to UDMA33\n", |
| 278 | drive->name, |
| 279 | hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); |
| 280 | |
| 281 | drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED; |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static const char *nien_quirk_list[] = { |
| 287 | "QUANTUM FIREBALLlct08 08", |
| 288 | "QUANTUM FIREBALLP KA6.4", |
| 289 | "QUANTUM FIREBALLP KA9.1", |
| 290 | "QUANTUM FIREBALLP KX13.6", |
| 291 | "QUANTUM FIREBALLP KX20.5", |
| 292 | "QUANTUM FIREBALLP KX27.3", |
| 293 | "QUANTUM FIREBALLP LM20.4", |
| 294 | "QUANTUM FIREBALLP LM20.5", |
| 295 | "FUJITSU MHZ2160BH G2", |
| 296 | NULL |
| 297 | }; |
| 298 | |
| 299 | void ide_check_nien_quirk_list(ide_drive_t *drive) |
| 300 | { |
| 301 | const char **list, *m = (char *)&drive->id[ATA_ID_PROD]; |
| 302 | |
| 303 | for (list = nien_quirk_list; *list != NULL; list++) |
| 304 | if (strstr(m, *list) != NULL) { |
| 305 | drive->dev_flags |= IDE_DFLAG_NIEN_QUIRK; |
| 306 | return; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | int ide_driveid_update(ide_drive_t *drive) |
| 311 | { |
| 312 | u16 *id; |
| 313 | int rc; |
| 314 | |
| 315 | id = kmalloc(SECTOR_SIZE, GFP_ATOMIC); |
| 316 | if (id == NULL) |
| 317 | return 0; |
| 318 | |
| 319 | SELECT_MASK(drive, 1); |
| 320 | rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id, 1); |
| 321 | SELECT_MASK(drive, 0); |
| 322 | |
| 323 | if (rc) |
| 324 | goto out_err; |
| 325 | |
| 326 | drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; |
| 327 | drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; |
| 328 | drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; |
| 329 | drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES]; |
| 330 | /* anything more ? */ |
| 331 | |
| 332 | kfree(id); |
| 333 | |
| 334 | return 1; |
| 335 | out_err: |
| 336 | if (rc == 2) |
| 337 | printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__); |
| 338 | kfree(id); |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | int ide_config_drive_speed(ide_drive_t *drive, u8 speed) |
| 343 | { |
| 344 | ide_hwif_t *hwif = drive->hwif; |
| 345 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 346 | struct ide_taskfile tf; |
| 347 | u16 *id = drive->id, i; |
| 348 | int error = 0; |
| 349 | u8 stat; |
| 350 | |
| 351 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 352 | if (hwif->dma_ops) /* check if host supports DMA */ |
| 353 | hwif->dma_ops->dma_host_set(drive, 0); |
| 354 | #endif |
| 355 | |
| 356 | /* Skip setting PIO flow-control modes on pre-EIDE drives */ |
| 357 | if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) |
| 358 | goto skip; |
| 359 | |
| 360 | /* |
| 361 | * Don't use ide_wait_cmd here - it will |
| 362 | * attempt to set_geometry and recalibrate, |
| 363 | * but for some reason these don't work at |
| 364 | * this point (lost interrupt). |
| 365 | */ |
| 366 | |
| 367 | udelay(1); |
| 368 | tp_ops->dev_select(drive); |
| 369 | SELECT_MASK(drive, 1); |
| 370 | udelay(1); |
| 371 | tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS); |
| 372 | |
| 373 | memset(&tf, 0, sizeof(tf)); |
| 374 | tf.feature = SETFEATURES_XFER; |
| 375 | tf.nsect = speed; |
| 376 | |
| 377 | tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT); |
| 378 | |
| 379 | tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); |
| 380 | |
| 381 | if (drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) |
| 382 | tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); |
| 383 | |
| 384 | error = __ide_wait_stat(drive, drive->ready_stat, |
| 385 | ATA_BUSY | ATA_DRQ | ATA_ERR, |
| 386 | WAIT_CMD, &stat); |
| 387 | |
| 388 | SELECT_MASK(drive, 0); |
| 389 | |
| 390 | if (error) { |
| 391 | (void) ide_dump_status(drive, "set_drive_speed_status", stat); |
| 392 | return error; |
| 393 | } |
| 394 | |
| 395 | if (speed >= XFER_SW_DMA_0) { |
| 396 | id[ATA_ID_UDMA_MODES] &= ~0xFF00; |
| 397 | id[ATA_ID_MWDMA_MODES] &= ~0x0700; |
| 398 | id[ATA_ID_SWDMA_MODES] &= ~0x0700; |
| 399 | if (ata_id_is_cfa(id)) |
| 400 | id[ATA_ID_CFA_MODES] &= ~0x0E00; |
| 401 | } else if (ata_id_is_cfa(id)) |
| 402 | id[ATA_ID_CFA_MODES] &= ~0x01C0; |
| 403 | |
| 404 | skip: |
| 405 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 406 | if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) |
| 407 | hwif->dma_ops->dma_host_set(drive, 1); |
| 408 | else if (hwif->dma_ops) /* check if host supports DMA */ |
| 409 | ide_dma_off_quietly(drive); |
| 410 | #endif |
| 411 | |
| 412 | if (speed >= XFER_UDMA_0) { |
| 413 | i = 1 << (speed - XFER_UDMA_0); |
| 414 | id[ATA_ID_UDMA_MODES] |= (i << 8 | i); |
| 415 | } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) { |
| 416 | i = speed - XFER_MW_DMA_2; |
| 417 | id[ATA_ID_CFA_MODES] |= i << 9; |
| 418 | } else if (speed >= XFER_MW_DMA_0) { |
| 419 | i = 1 << (speed - XFER_MW_DMA_0); |
| 420 | id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); |
| 421 | } else if (speed >= XFER_SW_DMA_0) { |
| 422 | i = 1 << (speed - XFER_SW_DMA_0); |
| 423 | id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); |
| 424 | } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) { |
| 425 | i = speed - XFER_PIO_4; |
| 426 | id[ATA_ID_CFA_MODES] |= i << 6; |
| 427 | } |
| 428 | |
| 429 | if (!drive->init_speed) |
| 430 | drive->init_speed = speed; |
| 431 | drive->current_speed = speed; |
| 432 | return error; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * This should get invoked any time we exit the driver to |
| 437 | * wait for an interrupt response from a drive. handler() points |
| 438 | * at the appropriate code to handle the next interrupt, and a |
| 439 | * timer is started to prevent us from waiting forever in case |
| 440 | * something goes wrong (see the ide_timer_expiry() handler later on). |
| 441 | * |
| 442 | * See also ide_execute_command |
| 443 | */ |
| 444 | void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, |
| 445 | unsigned int timeout) |
| 446 | { |
| 447 | ide_hwif_t *hwif = drive->hwif; |
| 448 | |
| 449 | BUG_ON(hwif->handler); |
| 450 | hwif->handler = handler; |
| 451 | hwif->timer.expires = jiffies + timeout; |
| 452 | hwif->req_gen_timer = hwif->req_gen; |
| 453 | add_timer(&hwif->timer); |
| 454 | } |
| 455 | |
| 456 | void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, |
| 457 | unsigned int timeout) |
| 458 | { |
| 459 | ide_hwif_t *hwif = drive->hwif; |
| 460 | unsigned long flags; |
| 461 | |
| 462 | spin_lock_irqsave(&hwif->lock, flags); |
| 463 | __ide_set_handler(drive, handler, timeout); |
| 464 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 465 | } |
| 466 | EXPORT_SYMBOL(ide_set_handler); |
| 467 | |
| 468 | /** |
| 469 | * ide_execute_command - execute an IDE command |
| 470 | * @drive: IDE drive to issue the command against |
| 471 | * @cmd: command |
| 472 | * @handler: handler for next phase |
| 473 | * @timeout: timeout for command |
| 474 | * |
| 475 | * Helper function to issue an IDE command. This handles the |
| 476 | * atomicity requirements, command timing and ensures that the |
| 477 | * handler and IRQ setup do not race. All IDE command kick off |
| 478 | * should go via this function or do equivalent locking. |
| 479 | */ |
| 480 | |
| 481 | void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd, |
| 482 | ide_handler_t *handler, unsigned timeout) |
| 483 | { |
| 484 | ide_hwif_t *hwif = drive->hwif; |
| 485 | unsigned long flags; |
| 486 | |
| 487 | spin_lock_irqsave(&hwif->lock, flags); |
| 488 | if ((cmd->protocol != ATAPI_PROT_DMA && |
| 489 | cmd->protocol != ATAPI_PROT_PIO) || |
| 490 | (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT)) |
| 491 | __ide_set_handler(drive, handler, timeout); |
| 492 | hwif->tp_ops->exec_command(hwif, cmd->tf.command); |
| 493 | /* |
| 494 | * Drive takes 400nS to respond, we must avoid the IRQ being |
| 495 | * serviced before that. |
| 496 | * |
| 497 | * FIXME: we could skip this delay with care on non shared devices |
| 498 | */ |
| 499 | ndelay(400); |
| 500 | spin_unlock_irqrestore(&hwif->lock, flags); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * ide_wait_not_busy() waits for the currently selected device on the hwif |
| 505 | * to report a non-busy status, see comments in ide_probe_port(). |
| 506 | */ |
| 507 | int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) |
| 508 | { |
| 509 | u8 stat = 0; |
| 510 | |
| 511 | while (timeout--) { |
| 512 | /* |
| 513 | * Turn this into a schedule() sleep once I'm sure |
| 514 | * about locking issues (2.5 work ?). |
| 515 | */ |
| 516 | mdelay(1); |
| 517 | stat = hwif->tp_ops->read_status(hwif); |
| 518 | if ((stat & ATA_BUSY) == 0) |
| 519 | return 0; |
| 520 | /* |
| 521 | * Assume a value of 0xff means nothing is connected to |
| 522 | * the interface and it doesn't implement the pull-down |
| 523 | * resistor on D7. |
| 524 | */ |
| 525 | if (stat == 0xff) |
| 526 | return -ENODEV; |
| 527 | touch_softlockup_watchdog(); |
| 528 | touch_nmi_watchdog(); |
| 529 | } |
| 530 | return -EBUSY; |
| 531 | } |