ide-iops.c revision 327fa1c29466b8fe471a91fc11e9c6171163c81a
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 30void SELECT_DRIVE(ide_drive_t *drive) 31{ 32 ide_hwif_t *hwif = drive->hwif; 33 const struct ide_port_ops *port_ops = hwif->port_ops; 34 ide_task_t task; 35 36 if (port_ops && port_ops->selectproc) 37 port_ops->selectproc(drive); 38 39 memset(&task, 0, sizeof(task)); 40 task.tf_flags = IDE_TFLAG_OUT_DEVICE; 41 42 drive->hwif->tp_ops->tf_load(drive, &task); 43} 44 45void SELECT_MASK(ide_drive_t *drive, int mask) 46{ 47 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 48 49 if (port_ops && port_ops->maskproc) 50 port_ops->maskproc(drive, mask); 51} 52 53u8 ide_read_error(ide_drive_t *drive) 54{ 55 ide_task_t task; 56 57 memset(&task, 0, sizeof(task)); 58 task.tf_flags = IDE_TFLAG_IN_FEATURE; 59 60 drive->hwif->tp_ops->tf_read(drive, &task); 61 62 return task.tf.error; 63} 64EXPORT_SYMBOL_GPL(ide_read_error); 65 66void ide_fix_driveid(u16 *id) 67{ 68#ifndef __LITTLE_ENDIAN 69# ifdef __BIG_ENDIAN 70 int i; 71 72 for (i = 0; i < 256; i++) 73 id[i] = __le16_to_cpu(id[i]); 74# else 75# error "Please fix <asm/byteorder.h>" 76# endif 77#endif 78} 79 80/* 81 * ide_fixstring() cleans up and (optionally) byte-swaps a text string, 82 * removing leading/trailing blanks and compressing internal blanks. 83 * It is primarily used to tidy up the model name/number fields as 84 * returned by the ATA_CMD_ID_ATA[PI] commands. 85 */ 86 87void ide_fixstring(u8 *s, const int bytecount, const int byteswap) 88{ 89 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ 90 91 if (byteswap) { 92 /* convert from big-endian to host byte order */ 93 for (p = s ; p != end ; p += 2) 94 be16_to_cpus((u16 *) p); 95 } 96 97 /* strip leading blanks */ 98 p = s; 99 while (s != end && *s == ' ') 100 ++s; 101 /* compress internal blanks and strip trailing blanks */ 102 while (s != end && *s) { 103 if (*s++ != ' ' || (s != end && *s && *s != ' ')) 104 *p++ = *(s-1); 105 } 106 /* wipe out trailing garbage */ 107 while (p != end) 108 *p++ = '\0'; 109} 110EXPORT_SYMBOL(ide_fixstring); 111 112/* 113 * This routine busy-waits for the drive status to be not "busy". 114 * It then checks the status for all of the "good" bits and none 115 * of the "bad" bits, and if all is okay it returns 0. All other 116 * cases return error -- caller may then invoke ide_error(). 117 * 118 * This routine should get fixed to not hog the cpu during extra long waits.. 119 * That could be done by busy-waiting for the first jiffy or two, and then 120 * setting a timer to wake up at half second intervals thereafter, 121 * until timeout is achieved, before timing out. 122 */ 123static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, 124 unsigned long timeout, u8 *rstat) 125{ 126 ide_hwif_t *hwif = drive->hwif; 127 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 128 unsigned long flags; 129 int i; 130 u8 stat; 131 132 udelay(1); /* spec allows drive 400ns to assert "BUSY" */ 133 stat = tp_ops->read_status(hwif); 134 135 if (stat & ATA_BUSY) { 136 local_save_flags(flags); 137 local_irq_enable_in_hardirq(); 138 timeout += jiffies; 139 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { 140 if (time_after(jiffies, timeout)) { 141 /* 142 * One last read after the timeout in case 143 * heavy interrupt load made us not make any 144 * progress during the timeout.. 145 */ 146 stat = tp_ops->read_status(hwif); 147 if ((stat & ATA_BUSY) == 0) 148 break; 149 150 local_irq_restore(flags); 151 *rstat = stat; 152 return -EBUSY; 153 } 154 } 155 local_irq_restore(flags); 156 } 157 /* 158 * Allow status to settle, then read it again. 159 * A few rare drives vastly violate the 400ns spec here, 160 * so we'll wait up to 10usec for a "good" status 161 * rather than expensively fail things immediately. 162 * This fix courtesy of Matthew Faupel & Niccolo Rigacci. 163 */ 164 for (i = 0; i < 10; i++) { 165 udelay(1); 166 stat = tp_ops->read_status(hwif); 167 168 if (OK_STAT(stat, good, bad)) { 169 *rstat = stat; 170 return 0; 171 } 172 } 173 *rstat = stat; 174 return -EFAULT; 175} 176 177/* 178 * In case of error returns error value after doing "*startstop = ide_error()". 179 * The caller should return the updated value of "startstop" in this case, 180 * "startstop" is unchanged when the function returns 0. 181 */ 182int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, 183 u8 bad, unsigned long timeout) 184{ 185 int err; 186 u8 stat; 187 188 /* bail early if we've exceeded max_failures */ 189 if (drive->max_failures && (drive->failures > drive->max_failures)) { 190 *startstop = ide_stopped; 191 return 1; 192 } 193 194 err = __ide_wait_stat(drive, good, bad, timeout, &stat); 195 196 if (err) { 197 char *s = (err == -EBUSY) ? "status timeout" : "status error"; 198 *startstop = ide_error(drive, s, stat); 199 } 200 201 return err; 202} 203EXPORT_SYMBOL(ide_wait_stat); 204 205/** 206 * ide_in_drive_list - look for drive in black/white list 207 * @id: drive identifier 208 * @table: list to inspect 209 * 210 * Look for a drive in the blacklist and the whitelist tables 211 * Returns 1 if the drive is found in the table. 212 */ 213 214int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) 215{ 216 for ( ; table->id_model; table++) 217 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && 218 (!table->id_firmware || 219 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) 220 return 1; 221 return 0; 222} 223EXPORT_SYMBOL_GPL(ide_in_drive_list); 224 225/* 226 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. 227 * We list them here and depend on the device side cable detection for them. 228 * 229 * Some optical devices with the buggy firmwares have the same problem. 230 */ 231static const struct drive_list_entry ivb_list[] = { 232 { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, 233 { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, 234 { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, 235 { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, 236 { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, 237 { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, 238 { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, 239 { "SAMSUNG SP0822N" , "WA100-10" }, 240 { NULL , NULL } 241}; 242 243/* 244 * All hosts that use the 80c ribbon must use! 245 * The name is derived from upper byte of word 93 and the 80c ribbon. 246 */ 247u8 eighty_ninty_three(ide_drive_t *drive) 248{ 249 ide_hwif_t *hwif = drive->hwif; 250 u16 *id = drive->id; 251 int ivb = ide_in_drive_list(id, ivb_list); 252 253 if (hwif->cbl == ATA_CBL_PATA40_SHORT) 254 return 1; 255 256 if (ivb) 257 printk(KERN_DEBUG "%s: skipping word 93 validity check\n", 258 drive->name); 259 260 if (ata_id_is_sata(id) && !ivb) 261 return 1; 262 263 if (hwif->cbl != ATA_CBL_PATA80 && !ivb) 264 goto no_80w; 265 266 /* 267 * FIXME: 268 * - change master/slave IDENTIFY order 269 * - force bit13 (80c cable present) check also for !ivb devices 270 * (unless the slave device is pre-ATA3) 271 */ 272 if ((id[ATA_ID_HW_CONFIG] & 0x4000) || 273 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000))) 274 return 1; 275 276no_80w: 277 if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED) 278 return 0; 279 280 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " 281 "limiting max speed to UDMA33\n", 282 drive->name, 283 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); 284 285 drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED; 286 287 return 0; 288} 289 290int ide_driveid_update(ide_drive_t *drive) 291{ 292 ide_hwif_t *hwif = drive->hwif; 293 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 294 u16 *id; 295 unsigned long flags; 296 u8 stat; 297 298 /* 299 * Re-read drive->id for possible DMA mode 300 * change (copied from ide-probe.c) 301 */ 302 303 SELECT_MASK(drive, 1); 304 tp_ops->set_irq(hwif, 0); 305 msleep(50); 306 tp_ops->exec_command(hwif, ATA_CMD_ID_ATA); 307 308 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) { 309 SELECT_MASK(drive, 0); 310 return 0; 311 } 312 313 msleep(50); /* wait for IRQ and ATA_DRQ */ 314 stat = tp_ops->read_status(hwif); 315 316 if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) { 317 SELECT_MASK(drive, 0); 318 printk("%s: CHECK for good STATUS\n", drive->name); 319 return 0; 320 } 321 local_irq_save(flags); 322 SELECT_MASK(drive, 0); 323 id = kmalloc(SECTOR_SIZE, GFP_ATOMIC); 324 if (!id) { 325 local_irq_restore(flags); 326 return 0; 327 } 328 tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); 329 (void)tp_ops->read_status(hwif); /* clear drive IRQ */ 330 local_irq_enable(); 331 local_irq_restore(flags); 332 ide_fix_driveid(id); 333 334 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; 335 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; 336 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; 337 /* anything more ? */ 338 339 kfree(id); 340 341 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive)) 342 ide_dma_off(drive); 343 344 return 1; 345} 346 347int ide_config_drive_speed(ide_drive_t *drive, u8 speed) 348{ 349 ide_hwif_t *hwif = drive->hwif; 350 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 351 u16 *id = drive->id, i; 352 int error = 0; 353 u8 stat; 354 ide_task_t task; 355 356#ifdef CONFIG_BLK_DEV_IDEDMA 357 if (hwif->dma_ops) /* check if host supports DMA */ 358 hwif->dma_ops->dma_host_set(drive, 0); 359#endif 360 361 /* Skip setting PIO flow-control modes on pre-EIDE drives */ 362 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) 363 goto skip; 364 365 /* 366 * Don't use ide_wait_cmd here - it will 367 * attempt to set_geometry and recalibrate, 368 * but for some reason these don't work at 369 * this point (lost interrupt). 370 */ 371 372 /* 373 * FIXME: we race against the running IRQ here if 374 * this is called from non IRQ context. If we use 375 * disable_irq() we hang on the error path. Work 376 * is needed. 377 */ 378 disable_irq_nosync(hwif->irq); 379 380 udelay(1); 381 SELECT_DRIVE(drive); 382 SELECT_MASK(drive, 1); 383 udelay(1); 384 tp_ops->set_irq(hwif, 0); 385 386 memset(&task, 0, sizeof(task)); 387 task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT; 388 task.tf.feature = SETFEATURES_XFER; 389 task.tf.nsect = speed; 390 391 tp_ops->tf_load(drive, &task); 392 393 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); 394 395 if (drive->quirk_list == 2) 396 tp_ops->set_irq(hwif, 1); 397 398 error = __ide_wait_stat(drive, drive->ready_stat, 399 ATA_BUSY | ATA_DRQ | ATA_ERR, 400 WAIT_CMD, &stat); 401 402 SELECT_MASK(drive, 0); 403 404 enable_irq(hwif->irq); 405 406 if (error) { 407 (void) ide_dump_status(drive, "set_drive_speed_status", stat); 408 return error; 409 } 410 411 id[ATA_ID_UDMA_MODES] &= ~0xFF00; 412 id[ATA_ID_MWDMA_MODES] &= ~0x0F00; 413 id[ATA_ID_SWDMA_MODES] &= ~0x0F00; 414 415 skip: 416#ifdef CONFIG_BLK_DEV_IDEDMA 417 if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) 418 hwif->dma_ops->dma_host_set(drive, 1); 419 else if (hwif->dma_ops) /* check if host supports DMA */ 420 ide_dma_off_quietly(drive); 421#endif 422 423 if (speed >= XFER_UDMA_0) { 424 i = 1 << (speed - XFER_UDMA_0); 425 id[ATA_ID_UDMA_MODES] |= (i << 8 | i); 426 } else if (speed >= XFER_MW_DMA_0) { 427 i = 1 << (speed - XFER_MW_DMA_0); 428 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); 429 } else if (speed >= XFER_SW_DMA_0) { 430 i = 1 << (speed - XFER_SW_DMA_0); 431 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); 432 } 433 434 if (!drive->init_speed) 435 drive->init_speed = speed; 436 drive->current_speed = speed; 437 return error; 438} 439 440/* 441 * This should get invoked any time we exit the driver to 442 * wait for an interrupt response from a drive. handler() points 443 * at the appropriate code to handle the next interrupt, and a 444 * timer is started to prevent us from waiting forever in case 445 * something goes wrong (see the ide_timer_expiry() handler later on). 446 * 447 * See also ide_execute_command 448 */ 449void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, 450 unsigned int timeout, ide_expiry_t *expiry) 451{ 452 ide_hwif_t *hwif = drive->hwif; 453 454 BUG_ON(hwif->handler); 455 hwif->handler = handler; 456 hwif->expiry = expiry; 457 hwif->timer.expires = jiffies + timeout; 458 hwif->req_gen_timer = hwif->req_gen; 459 add_timer(&hwif->timer); 460} 461 462void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, 463 unsigned int timeout, ide_expiry_t *expiry) 464{ 465 ide_hwif_t *hwif = drive->hwif; 466 unsigned long flags; 467 468 spin_lock_irqsave(&hwif->lock, flags); 469 __ide_set_handler(drive, handler, timeout, expiry); 470 spin_unlock_irqrestore(&hwif->lock, flags); 471} 472EXPORT_SYMBOL(ide_set_handler); 473 474/** 475 * ide_execute_command - execute an IDE command 476 * @drive: IDE drive to issue the command against 477 * @command: command byte to write 478 * @handler: handler for next phase 479 * @timeout: timeout for command 480 * @expiry: handler to run on timeout 481 * 482 * Helper function to issue an IDE command. This handles the 483 * atomicity requirements, command timing and ensures that the 484 * handler and IRQ setup do not race. All IDE command kick off 485 * should go via this function or do equivalent locking. 486 */ 487 488void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler, 489 unsigned timeout, ide_expiry_t *expiry) 490{ 491 ide_hwif_t *hwif = drive->hwif; 492 unsigned long flags; 493 494 spin_lock_irqsave(&hwif->lock, flags); 495 __ide_set_handler(drive, handler, timeout, expiry); 496 hwif->tp_ops->exec_command(hwif, cmd); 497 /* 498 * Drive takes 400nS to respond, we must avoid the IRQ being 499 * serviced before that. 500 * 501 * FIXME: we could skip this delay with care on non shared devices 502 */ 503 ndelay(400); 504 spin_unlock_irqrestore(&hwif->lock, flags); 505} 506EXPORT_SYMBOL(ide_execute_command); 507 508void ide_execute_pkt_cmd(ide_drive_t *drive) 509{ 510 ide_hwif_t *hwif = drive->hwif; 511 unsigned long flags; 512 513 spin_lock_irqsave(&hwif->lock, flags); 514 hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET); 515 ndelay(400); 516 spin_unlock_irqrestore(&hwif->lock, flags); 517} 518EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd); 519 520/* 521 * ide_wait_not_busy() waits for the currently selected device on the hwif 522 * to report a non-busy status, see comments in ide_probe_port(). 523 */ 524int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) 525{ 526 u8 stat = 0; 527 528 while (timeout--) { 529 /* 530 * Turn this into a schedule() sleep once I'm sure 531 * about locking issues (2.5 work ?). 532 */ 533 mdelay(1); 534 stat = hwif->tp_ops->read_status(hwif); 535 if ((stat & ATA_BUSY) == 0) 536 return 0; 537 /* 538 * Assume a value of 0xff means nothing is connected to 539 * the interface and it doesn't implement the pull-down 540 * resistor on D7. 541 */ 542 if (stat == 0xff) 543 return -ENODEV; 544 touch_softlockup_watchdog(); 545 touch_nmi_watchdog(); 546 } 547 return -EBUSY; 548} 549