| 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 | /* |
| 31 | * Conventional PIO operations for ATA devices |
| 32 | */ |
| 33 | |
| 34 | static u8 ide_inb (unsigned long port) |
| 35 | { |
| 36 | return (u8) inb(port); |
| 37 | } |
| 38 | |
| 39 | static void ide_outb (u8 val, unsigned long port) |
| 40 | { |
| 41 | outb(val, port); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * MMIO operations, typically used for SATA controllers |
| 46 | */ |
| 47 | |
| 48 | static u8 ide_mm_inb (unsigned long port) |
| 49 | { |
| 50 | return (u8) readb((void __iomem *) port); |
| 51 | } |
| 52 | |
| 53 | static void ide_mm_outb (u8 value, unsigned long port) |
| 54 | { |
| 55 | writeb(value, (void __iomem *) port); |
| 56 | } |
| 57 | |
| 58 | void SELECT_DRIVE (ide_drive_t *drive) |
| 59 | { |
| 60 | ide_hwif_t *hwif = drive->hwif; |
| 61 | const struct ide_port_ops *port_ops = hwif->port_ops; |
| 62 | ide_task_t task; |
| 63 | |
| 64 | if (port_ops && port_ops->selectproc) |
| 65 | port_ops->selectproc(drive); |
| 66 | |
| 67 | memset(&task, 0, sizeof(task)); |
| 68 | task.tf_flags = IDE_TFLAG_OUT_DEVICE; |
| 69 | |
| 70 | drive->hwif->tp_ops->tf_load(drive, &task); |
| 71 | } |
| 72 | |
| 73 | void SELECT_MASK(ide_drive_t *drive, int mask) |
| 74 | { |
| 75 | const struct ide_port_ops *port_ops = drive->hwif->port_ops; |
| 76 | |
| 77 | if (port_ops && port_ops->maskproc) |
| 78 | port_ops->maskproc(drive, mask); |
| 79 | } |
| 80 | |
| 81 | void ide_exec_command(ide_hwif_t *hwif, u8 cmd) |
| 82 | { |
| 83 | if (hwif->host_flags & IDE_HFLAG_MMIO) |
| 84 | writeb(cmd, (void __iomem *)hwif->io_ports.command_addr); |
| 85 | else |
| 86 | outb(cmd, hwif->io_ports.command_addr); |
| 87 | } |
| 88 | EXPORT_SYMBOL_GPL(ide_exec_command); |
| 89 | |
| 90 | u8 ide_read_status(ide_hwif_t *hwif) |
| 91 | { |
| 92 | if (hwif->host_flags & IDE_HFLAG_MMIO) |
| 93 | return readb((void __iomem *)hwif->io_ports.status_addr); |
| 94 | else |
| 95 | return inb(hwif->io_ports.status_addr); |
| 96 | } |
| 97 | EXPORT_SYMBOL_GPL(ide_read_status); |
| 98 | |
| 99 | u8 ide_read_altstatus(ide_hwif_t *hwif) |
| 100 | { |
| 101 | if (hwif->host_flags & IDE_HFLAG_MMIO) |
| 102 | return readb((void __iomem *)hwif->io_ports.ctl_addr); |
| 103 | else |
| 104 | return inb(hwif->io_ports.ctl_addr); |
| 105 | } |
| 106 | EXPORT_SYMBOL_GPL(ide_read_altstatus); |
| 107 | |
| 108 | u8 ide_read_sff_dma_status(ide_hwif_t *hwif) |
| 109 | { |
| 110 | if (hwif->host_flags & IDE_HFLAG_MMIO) |
| 111 | return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS)); |
| 112 | else |
| 113 | return inb(hwif->dma_base + ATA_DMA_STATUS); |
| 114 | } |
| 115 | EXPORT_SYMBOL_GPL(ide_read_sff_dma_status); |
| 116 | |
| 117 | void ide_set_irq(ide_hwif_t *hwif, int on) |
| 118 | { |
| 119 | u8 ctl = ATA_DEVCTL_OBS; |
| 120 | |
| 121 | if (on == 4) { /* hack for SRST */ |
| 122 | ctl |= 4; |
| 123 | on &= ~4; |
| 124 | } |
| 125 | |
| 126 | ctl |= on ? 0 : 2; |
| 127 | |
| 128 | if (hwif->host_flags & IDE_HFLAG_MMIO) |
| 129 | writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr); |
| 130 | else |
| 131 | outb(ctl, hwif->io_ports.ctl_addr); |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(ide_set_irq); |
| 134 | |
| 135 | void ide_tf_load(ide_drive_t *drive, ide_task_t *task) |
| 136 | { |
| 137 | ide_hwif_t *hwif = drive->hwif; |
| 138 | struct ide_io_ports *io_ports = &hwif->io_ports; |
| 139 | struct ide_taskfile *tf = &task->tf; |
| 140 | void (*tf_outb)(u8 addr, unsigned long port); |
| 141 | u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; |
| 142 | u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF; |
| 143 | |
| 144 | if (mmio) |
| 145 | tf_outb = ide_mm_outb; |
| 146 | else |
| 147 | tf_outb = ide_outb; |
| 148 | |
| 149 | if (task->tf_flags & IDE_TFLAG_FLAGGED) |
| 150 | HIHI = 0xFF; |
| 151 | |
| 152 | if (task->tf_flags & IDE_TFLAG_OUT_DATA) { |
| 153 | u16 data = (tf->hob_data << 8) | tf->data; |
| 154 | |
| 155 | if (mmio) |
| 156 | writew(data, (void __iomem *)io_ports->data_addr); |
| 157 | else |
| 158 | outw(data, io_ports->data_addr); |
| 159 | } |
| 160 | |
| 161 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) |
| 162 | tf_outb(tf->hob_feature, io_ports->feature_addr); |
| 163 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) |
| 164 | tf_outb(tf->hob_nsect, io_ports->nsect_addr); |
| 165 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) |
| 166 | tf_outb(tf->hob_lbal, io_ports->lbal_addr); |
| 167 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) |
| 168 | tf_outb(tf->hob_lbam, io_ports->lbam_addr); |
| 169 | if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) |
| 170 | tf_outb(tf->hob_lbah, io_ports->lbah_addr); |
| 171 | |
| 172 | if (task->tf_flags & IDE_TFLAG_OUT_FEATURE) |
| 173 | tf_outb(tf->feature, io_ports->feature_addr); |
| 174 | if (task->tf_flags & IDE_TFLAG_OUT_NSECT) |
| 175 | tf_outb(tf->nsect, io_ports->nsect_addr); |
| 176 | if (task->tf_flags & IDE_TFLAG_OUT_LBAL) |
| 177 | tf_outb(tf->lbal, io_ports->lbal_addr); |
| 178 | if (task->tf_flags & IDE_TFLAG_OUT_LBAM) |
| 179 | tf_outb(tf->lbam, io_ports->lbam_addr); |
| 180 | if (task->tf_flags & IDE_TFLAG_OUT_LBAH) |
| 181 | tf_outb(tf->lbah, io_ports->lbah_addr); |
| 182 | |
| 183 | if (task->tf_flags & IDE_TFLAG_OUT_DEVICE) |
| 184 | tf_outb((tf->device & HIHI) | drive->select, |
| 185 | io_ports->device_addr); |
| 186 | } |
| 187 | EXPORT_SYMBOL_GPL(ide_tf_load); |
| 188 | |
| 189 | void ide_tf_read(ide_drive_t *drive, ide_task_t *task) |
| 190 | { |
| 191 | ide_hwif_t *hwif = drive->hwif; |
| 192 | struct ide_io_ports *io_ports = &hwif->io_ports; |
| 193 | struct ide_taskfile *tf = &task->tf; |
| 194 | void (*tf_outb)(u8 addr, unsigned long port); |
| 195 | u8 (*tf_inb)(unsigned long port); |
| 196 | u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; |
| 197 | |
| 198 | if (mmio) { |
| 199 | tf_outb = ide_mm_outb; |
| 200 | tf_inb = ide_mm_inb; |
| 201 | } else { |
| 202 | tf_outb = ide_outb; |
| 203 | tf_inb = ide_inb; |
| 204 | } |
| 205 | |
| 206 | if (task->tf_flags & IDE_TFLAG_IN_DATA) { |
| 207 | u16 data; |
| 208 | |
| 209 | if (mmio) |
| 210 | data = readw((void __iomem *)io_ports->data_addr); |
| 211 | else |
| 212 | data = inw(io_ports->data_addr); |
| 213 | |
| 214 | tf->data = data & 0xff; |
| 215 | tf->hob_data = (data >> 8) & 0xff; |
| 216 | } |
| 217 | |
| 218 | /* be sure we're looking at the low order bits */ |
| 219 | tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr); |
| 220 | |
| 221 | if (task->tf_flags & IDE_TFLAG_IN_FEATURE) |
| 222 | tf->feature = tf_inb(io_ports->feature_addr); |
| 223 | if (task->tf_flags & IDE_TFLAG_IN_NSECT) |
| 224 | tf->nsect = tf_inb(io_ports->nsect_addr); |
| 225 | if (task->tf_flags & IDE_TFLAG_IN_LBAL) |
| 226 | tf->lbal = tf_inb(io_ports->lbal_addr); |
| 227 | if (task->tf_flags & IDE_TFLAG_IN_LBAM) |
| 228 | tf->lbam = tf_inb(io_ports->lbam_addr); |
| 229 | if (task->tf_flags & IDE_TFLAG_IN_LBAH) |
| 230 | tf->lbah = tf_inb(io_ports->lbah_addr); |
| 231 | if (task->tf_flags & IDE_TFLAG_IN_DEVICE) |
| 232 | tf->device = tf_inb(io_ports->device_addr); |
| 233 | |
| 234 | if (task->tf_flags & IDE_TFLAG_LBA48) { |
| 235 | tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr); |
| 236 | |
| 237 | if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) |
| 238 | tf->hob_feature = tf_inb(io_ports->feature_addr); |
| 239 | if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) |
| 240 | tf->hob_nsect = tf_inb(io_ports->nsect_addr); |
| 241 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) |
| 242 | tf->hob_lbal = tf_inb(io_ports->lbal_addr); |
| 243 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) |
| 244 | tf->hob_lbam = tf_inb(io_ports->lbam_addr); |
| 245 | if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) |
| 246 | tf->hob_lbah = tf_inb(io_ports->lbah_addr); |
| 247 | } |
| 248 | } |
| 249 | EXPORT_SYMBOL_GPL(ide_tf_read); |
| 250 | |
| 251 | /* |
| 252 | * Some localbus EIDE interfaces require a special access sequence |
| 253 | * when using 32-bit I/O instructions to transfer data. We call this |
| 254 | * the "vlb_sync" sequence, which consists of three successive reads |
| 255 | * of the sector count register location, with interrupts disabled |
| 256 | * to ensure that the reads all happen together. |
| 257 | */ |
| 258 | static void ata_vlb_sync(unsigned long port) |
| 259 | { |
| 260 | (void)inb(port); |
| 261 | (void)inb(port); |
| 262 | (void)inb(port); |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * This is used for most PIO data transfers *from* the IDE interface |
| 267 | * |
| 268 | * These routines will round up any request for an odd number of bytes, |
| 269 | * so if an odd len is specified, be sure that there's at least one |
| 270 | * extra byte allocated for the buffer. |
| 271 | */ |
| 272 | void ide_input_data(ide_drive_t *drive, struct request *rq, void *buf, |
| 273 | unsigned int len) |
| 274 | { |
| 275 | ide_hwif_t *hwif = drive->hwif; |
| 276 | struct ide_io_ports *io_ports = &hwif->io_ports; |
| 277 | unsigned long data_addr = io_ports->data_addr; |
| 278 | u8 io_32bit = drive->io_32bit; |
| 279 | u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; |
| 280 | |
| 281 | len++; |
| 282 | |
| 283 | if (io_32bit) { |
| 284 | unsigned long uninitialized_var(flags); |
| 285 | |
| 286 | if ((io_32bit & 2) && !mmio) { |
| 287 | local_irq_save(flags); |
| 288 | ata_vlb_sync(io_ports->nsect_addr); |
| 289 | } |
| 290 | |
| 291 | if (mmio) |
| 292 | __ide_mm_insl((void __iomem *)data_addr, buf, len / 4); |
| 293 | else |
| 294 | insl(data_addr, buf, len / 4); |
| 295 | |
| 296 | if ((io_32bit & 2) && !mmio) |
| 297 | local_irq_restore(flags); |
| 298 | |
| 299 | if ((len & 3) >= 2) { |
| 300 | if (mmio) |
| 301 | __ide_mm_insw((void __iomem *)data_addr, |
| 302 | (u8 *)buf + (len & ~3), 1); |
| 303 | else |
| 304 | insw(data_addr, (u8 *)buf + (len & ~3), 1); |
| 305 | } |
| 306 | } else { |
| 307 | if (mmio) |
| 308 | __ide_mm_insw((void __iomem *)data_addr, buf, len / 2); |
| 309 | else |
| 310 | insw(data_addr, buf, len / 2); |
| 311 | } |
| 312 | } |
| 313 | EXPORT_SYMBOL_GPL(ide_input_data); |
| 314 | |
| 315 | /* |
| 316 | * This is used for most PIO data transfers *to* the IDE interface |
| 317 | */ |
| 318 | void ide_output_data(ide_drive_t *drive, struct request *rq, void *buf, |
| 319 | unsigned int len) |
| 320 | { |
| 321 | ide_hwif_t *hwif = drive->hwif; |
| 322 | struct ide_io_ports *io_ports = &hwif->io_ports; |
| 323 | unsigned long data_addr = io_ports->data_addr; |
| 324 | u8 io_32bit = drive->io_32bit; |
| 325 | u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; |
| 326 | |
| 327 | if (io_32bit) { |
| 328 | unsigned long uninitialized_var(flags); |
| 329 | |
| 330 | if ((io_32bit & 2) && !mmio) { |
| 331 | local_irq_save(flags); |
| 332 | ata_vlb_sync(io_ports->nsect_addr); |
| 333 | } |
| 334 | |
| 335 | if (mmio) |
| 336 | __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4); |
| 337 | else |
| 338 | outsl(data_addr, buf, len / 4); |
| 339 | |
| 340 | if ((io_32bit & 2) && !mmio) |
| 341 | local_irq_restore(flags); |
| 342 | |
| 343 | if ((len & 3) >= 2) { |
| 344 | if (mmio) |
| 345 | __ide_mm_outsw((void __iomem *)data_addr, |
| 346 | (u8 *)buf + (len & ~3), 1); |
| 347 | else |
| 348 | outsw(data_addr, (u8 *)buf + (len & ~3), 1); |
| 349 | } |
| 350 | } else { |
| 351 | if (mmio) |
| 352 | __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2); |
| 353 | else |
| 354 | outsw(data_addr, buf, len / 2); |
| 355 | } |
| 356 | } |
| 357 | EXPORT_SYMBOL_GPL(ide_output_data); |
| 358 | |
| 359 | u8 ide_read_error(ide_drive_t *drive) |
| 360 | { |
| 361 | ide_task_t task; |
| 362 | |
| 363 | memset(&task, 0, sizeof(task)); |
| 364 | task.tf_flags = IDE_TFLAG_IN_FEATURE; |
| 365 | |
| 366 | drive->hwif->tp_ops->tf_read(drive, &task); |
| 367 | |
| 368 | return task.tf.error; |
| 369 | } |
| 370 | EXPORT_SYMBOL_GPL(ide_read_error); |
| 371 | |
| 372 | void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) |
| 373 | { |
| 374 | ide_task_t task; |
| 375 | |
| 376 | memset(&task, 0, sizeof(task)); |
| 377 | task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM | |
| 378 | IDE_TFLAG_IN_NSECT; |
| 379 | |
| 380 | drive->hwif->tp_ops->tf_read(drive, &task); |
| 381 | |
| 382 | *bcount = (task.tf.lbah << 8) | task.tf.lbam; |
| 383 | *ireason = task.tf.nsect & 3; |
| 384 | } |
| 385 | EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); |
| 386 | |
| 387 | const struct ide_tp_ops default_tp_ops = { |
| 388 | .exec_command = ide_exec_command, |
| 389 | .read_status = ide_read_status, |
| 390 | .read_altstatus = ide_read_altstatus, |
| 391 | .read_sff_dma_status = ide_read_sff_dma_status, |
| 392 | |
| 393 | .set_irq = ide_set_irq, |
| 394 | |
| 395 | .tf_load = ide_tf_load, |
| 396 | .tf_read = ide_tf_read, |
| 397 | |
| 398 | .input_data = ide_input_data, |
| 399 | .output_data = ide_output_data, |
| 400 | }; |
| 401 | |
| 402 | void ide_fix_driveid(u16 *id) |
| 403 | { |
| 404 | #ifndef __LITTLE_ENDIAN |
| 405 | # ifdef __BIG_ENDIAN |
| 406 | int i; |
| 407 | |
| 408 | for (i = 0; i < 256; i++) |
| 409 | id[i] = __le16_to_cpu(id[i]); |
| 410 | # else |
| 411 | # error "Please fix <asm/byteorder.h>" |
| 412 | # endif |
| 413 | #endif |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * ide_fixstring() cleans up and (optionally) byte-swaps a text string, |
| 418 | * removing leading/trailing blanks and compressing internal blanks. |
| 419 | * It is primarily used to tidy up the model name/number fields as |
| 420 | * returned by the ATA_CMD_ID_ATA[PI] commands. |
| 421 | */ |
| 422 | |
| 423 | void ide_fixstring (u8 *s, const int bytecount, const int byteswap) |
| 424 | { |
| 425 | u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ |
| 426 | |
| 427 | if (byteswap) { |
| 428 | /* convert from big-endian to host byte order */ |
| 429 | for (p = s ; p != end ; p += 2) |
| 430 | be16_to_cpus((u16 *) p); |
| 431 | } |
| 432 | |
| 433 | /* strip leading blanks */ |
| 434 | p = s; |
| 435 | while (s != end && *s == ' ') |
| 436 | ++s; |
| 437 | /* compress internal blanks and strip trailing blanks */ |
| 438 | while (s != end && *s) { |
| 439 | if (*s++ != ' ' || (s != end && *s && *s != ' ')) |
| 440 | *p++ = *(s-1); |
| 441 | } |
| 442 | /* wipe out trailing garbage */ |
| 443 | while (p != end) |
| 444 | *p++ = '\0'; |
| 445 | } |
| 446 | |
| 447 | EXPORT_SYMBOL(ide_fixstring); |
| 448 | |
| 449 | /* |
| 450 | * Needed for PCI irq sharing |
| 451 | */ |
| 452 | int drive_is_ready (ide_drive_t *drive) |
| 453 | { |
| 454 | ide_hwif_t *hwif = HWIF(drive); |
| 455 | u8 stat = 0; |
| 456 | |
| 457 | if (drive->waiting_for_dma) |
| 458 | return hwif->dma_ops->dma_test_irq(drive); |
| 459 | |
| 460 | #if 0 |
| 461 | /* need to guarantee 400ns since last command was issued */ |
| 462 | udelay(1); |
| 463 | #endif |
| 464 | |
| 465 | /* |
| 466 | * We do a passive status test under shared PCI interrupts on |
| 467 | * cards that truly share the ATA side interrupt, but may also share |
| 468 | * an interrupt with another pci card/device. We make no assumptions |
| 469 | * about possible isa-pnp and pci-pnp issues yet. |
| 470 | */ |
| 471 | if (hwif->io_ports.ctl_addr && |
| 472 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) |
| 473 | stat = hwif->tp_ops->read_altstatus(hwif); |
| 474 | else |
| 475 | /* Note: this may clear a pending IRQ!! */ |
| 476 | stat = hwif->tp_ops->read_status(hwif); |
| 477 | |
| 478 | if (stat & ATA_BUSY) |
| 479 | /* drive busy: definitely not interrupting */ |
| 480 | return 0; |
| 481 | |
| 482 | /* drive ready: *might* be interrupting */ |
| 483 | return 1; |
| 484 | } |
| 485 | |
| 486 | EXPORT_SYMBOL(drive_is_ready); |
| 487 | |
| 488 | /* |
| 489 | * This routine busy-waits for the drive status to be not "busy". |
| 490 | * It then checks the status for all of the "good" bits and none |
| 491 | * of the "bad" bits, and if all is okay it returns 0. All other |
| 492 | * cases return error -- caller may then invoke ide_error(). |
| 493 | * |
| 494 | * This routine should get fixed to not hog the cpu during extra long waits.. |
| 495 | * That could be done by busy-waiting for the first jiffy or two, and then |
| 496 | * setting a timer to wake up at half second intervals thereafter, |
| 497 | * until timeout is achieved, before timing out. |
| 498 | */ |
| 499 | static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat) |
| 500 | { |
| 501 | ide_hwif_t *hwif = drive->hwif; |
| 502 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 503 | unsigned long flags; |
| 504 | int i; |
| 505 | u8 stat; |
| 506 | |
| 507 | udelay(1); /* spec allows drive 400ns to assert "BUSY" */ |
| 508 | stat = tp_ops->read_status(hwif); |
| 509 | |
| 510 | if (stat & ATA_BUSY) { |
| 511 | local_irq_set(flags); |
| 512 | timeout += jiffies; |
| 513 | while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { |
| 514 | if (time_after(jiffies, timeout)) { |
| 515 | /* |
| 516 | * One last read after the timeout in case |
| 517 | * heavy interrupt load made us not make any |
| 518 | * progress during the timeout.. |
| 519 | */ |
| 520 | stat = tp_ops->read_status(hwif); |
| 521 | if ((stat & ATA_BUSY) == 0) |
| 522 | break; |
| 523 | |
| 524 | local_irq_restore(flags); |
| 525 | *rstat = stat; |
| 526 | return -EBUSY; |
| 527 | } |
| 528 | } |
| 529 | local_irq_restore(flags); |
| 530 | } |
| 531 | /* |
| 532 | * Allow status to settle, then read it again. |
| 533 | * A few rare drives vastly violate the 400ns spec here, |
| 534 | * so we'll wait up to 10usec for a "good" status |
| 535 | * rather than expensively fail things immediately. |
| 536 | * This fix courtesy of Matthew Faupel & Niccolo Rigacci. |
| 537 | */ |
| 538 | for (i = 0; i < 10; i++) { |
| 539 | udelay(1); |
| 540 | stat = tp_ops->read_status(hwif); |
| 541 | |
| 542 | if (OK_STAT(stat, good, bad)) { |
| 543 | *rstat = stat; |
| 544 | return 0; |
| 545 | } |
| 546 | } |
| 547 | *rstat = stat; |
| 548 | return -EFAULT; |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * In case of error returns error value after doing "*startstop = ide_error()". |
| 553 | * The caller should return the updated value of "startstop" in this case, |
| 554 | * "startstop" is unchanged when the function returns 0. |
| 555 | */ |
| 556 | int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout) |
| 557 | { |
| 558 | int err; |
| 559 | u8 stat; |
| 560 | |
| 561 | /* bail early if we've exceeded max_failures */ |
| 562 | if (drive->max_failures && (drive->failures > drive->max_failures)) { |
| 563 | *startstop = ide_stopped; |
| 564 | return 1; |
| 565 | } |
| 566 | |
| 567 | err = __ide_wait_stat(drive, good, bad, timeout, &stat); |
| 568 | |
| 569 | if (err) { |
| 570 | char *s = (err == -EBUSY) ? "status timeout" : "status error"; |
| 571 | *startstop = ide_error(drive, s, stat); |
| 572 | } |
| 573 | |
| 574 | return err; |
| 575 | } |
| 576 | |
| 577 | EXPORT_SYMBOL(ide_wait_stat); |
| 578 | |
| 579 | /** |
| 580 | * ide_in_drive_list - look for drive in black/white list |
| 581 | * @id: drive identifier |
| 582 | * @table: list to inspect |
| 583 | * |
| 584 | * Look for a drive in the blacklist and the whitelist tables |
| 585 | * Returns 1 if the drive is found in the table. |
| 586 | */ |
| 587 | |
| 588 | int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) |
| 589 | { |
| 590 | for ( ; table->id_model; table++) |
| 591 | if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && |
| 592 | (!table->id_firmware || |
| 593 | strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) |
| 594 | return 1; |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | EXPORT_SYMBOL_GPL(ide_in_drive_list); |
| 599 | |
| 600 | /* |
| 601 | * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. |
| 602 | * We list them here and depend on the device side cable detection for them. |
| 603 | * |
| 604 | * Some optical devices with the buggy firmwares have the same problem. |
| 605 | */ |
| 606 | static const struct drive_list_entry ivb_list[] = { |
| 607 | { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, |
| 608 | { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, |
| 609 | { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, |
| 610 | { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, |
| 611 | { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, |
| 612 | { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, |
| 613 | { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, |
| 614 | { NULL , NULL } |
| 615 | }; |
| 616 | |
| 617 | /* |
| 618 | * All hosts that use the 80c ribbon must use! |
| 619 | * The name is derived from upper byte of word 93 and the 80c ribbon. |
| 620 | */ |
| 621 | u8 eighty_ninty_three (ide_drive_t *drive) |
| 622 | { |
| 623 | ide_hwif_t *hwif = drive->hwif; |
| 624 | u16 *id = drive->id; |
| 625 | int ivb = ide_in_drive_list(id, ivb_list); |
| 626 | |
| 627 | if (hwif->cbl == ATA_CBL_PATA40_SHORT) |
| 628 | return 1; |
| 629 | |
| 630 | if (ivb) |
| 631 | printk(KERN_DEBUG "%s: skipping word 93 validity check\n", |
| 632 | drive->name); |
| 633 | |
| 634 | if (ata_id_is_sata(id) && !ivb) |
| 635 | return 1; |
| 636 | |
| 637 | if (hwif->cbl != ATA_CBL_PATA80 && !ivb) |
| 638 | goto no_80w; |
| 639 | |
| 640 | /* |
| 641 | * FIXME: |
| 642 | * - change master/slave IDENTIFY order |
| 643 | * - force bit13 (80c cable present) check also for !ivb devices |
| 644 | * (unless the slave device is pre-ATA3) |
| 645 | */ |
| 646 | if ((id[ATA_ID_HW_CONFIG] & 0x4000) || |
| 647 | (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000))) |
| 648 | return 1; |
| 649 | |
| 650 | no_80w: |
| 651 | if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED) |
| 652 | return 0; |
| 653 | |
| 654 | printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " |
| 655 | "limiting max speed to UDMA33\n", |
| 656 | drive->name, |
| 657 | hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); |
| 658 | |
| 659 | drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED; |
| 660 | |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | int ide_driveid_update(ide_drive_t *drive) |
| 665 | { |
| 666 | ide_hwif_t *hwif = drive->hwif; |
| 667 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 668 | u16 *id; |
| 669 | unsigned long flags; |
| 670 | u8 stat; |
| 671 | |
| 672 | /* |
| 673 | * Re-read drive->id for possible DMA mode |
| 674 | * change (copied from ide-probe.c) |
| 675 | */ |
| 676 | |
| 677 | SELECT_MASK(drive, 1); |
| 678 | tp_ops->set_irq(hwif, 0); |
| 679 | msleep(50); |
| 680 | tp_ops->exec_command(hwif, ATA_CMD_ID_ATA); |
| 681 | |
| 682 | if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) { |
| 683 | SELECT_MASK(drive, 0); |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | msleep(50); /* wait for IRQ and ATA_DRQ */ |
| 688 | stat = tp_ops->read_status(hwif); |
| 689 | |
| 690 | if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) { |
| 691 | SELECT_MASK(drive, 0); |
| 692 | printk("%s: CHECK for good STATUS\n", drive->name); |
| 693 | return 0; |
| 694 | } |
| 695 | local_irq_save(flags); |
| 696 | SELECT_MASK(drive, 0); |
| 697 | id = kmalloc(SECTOR_SIZE, GFP_ATOMIC); |
| 698 | if (!id) { |
| 699 | local_irq_restore(flags); |
| 700 | return 0; |
| 701 | } |
| 702 | tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); |
| 703 | (void)tp_ops->read_status(hwif); /* clear drive IRQ */ |
| 704 | local_irq_enable(); |
| 705 | local_irq_restore(flags); |
| 706 | ide_fix_driveid(id); |
| 707 | |
| 708 | drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; |
| 709 | drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; |
| 710 | drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; |
| 711 | /* anything more ? */ |
| 712 | |
| 713 | kfree(id); |
| 714 | |
| 715 | if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive)) |
| 716 | ide_dma_off(drive); |
| 717 | |
| 718 | return 1; |
| 719 | } |
| 720 | |
| 721 | int ide_config_drive_speed(ide_drive_t *drive, u8 speed) |
| 722 | { |
| 723 | ide_hwif_t *hwif = drive->hwif; |
| 724 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 725 | u16 *id = drive->id, i; |
| 726 | int error = 0; |
| 727 | u8 stat; |
| 728 | ide_task_t task; |
| 729 | |
| 730 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 731 | if (hwif->dma_ops) /* check if host supports DMA */ |
| 732 | hwif->dma_ops->dma_host_set(drive, 0); |
| 733 | #endif |
| 734 | |
| 735 | /* Skip setting PIO flow-control modes on pre-EIDE drives */ |
| 736 | if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) |
| 737 | goto skip; |
| 738 | |
| 739 | /* |
| 740 | * Don't use ide_wait_cmd here - it will |
| 741 | * attempt to set_geometry and recalibrate, |
| 742 | * but for some reason these don't work at |
| 743 | * this point (lost interrupt). |
| 744 | */ |
| 745 | /* |
| 746 | * Select the drive, and issue the SETFEATURES command |
| 747 | */ |
| 748 | disable_irq_nosync(hwif->irq); |
| 749 | |
| 750 | /* |
| 751 | * FIXME: we race against the running IRQ here if |
| 752 | * this is called from non IRQ context. If we use |
| 753 | * disable_irq() we hang on the error path. Work |
| 754 | * is needed. |
| 755 | */ |
| 756 | |
| 757 | udelay(1); |
| 758 | SELECT_DRIVE(drive); |
| 759 | SELECT_MASK(drive, 1); |
| 760 | udelay(1); |
| 761 | tp_ops->set_irq(hwif, 0); |
| 762 | |
| 763 | memset(&task, 0, sizeof(task)); |
| 764 | task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT; |
| 765 | task.tf.feature = SETFEATURES_XFER; |
| 766 | task.tf.nsect = speed; |
| 767 | |
| 768 | tp_ops->tf_load(drive, &task); |
| 769 | |
| 770 | tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); |
| 771 | |
| 772 | if (drive->quirk_list == 2) |
| 773 | tp_ops->set_irq(hwif, 1); |
| 774 | |
| 775 | error = __ide_wait_stat(drive, drive->ready_stat, |
| 776 | ATA_BUSY | ATA_DRQ | ATA_ERR, |
| 777 | WAIT_CMD, &stat); |
| 778 | |
| 779 | SELECT_MASK(drive, 0); |
| 780 | |
| 781 | enable_irq(hwif->irq); |
| 782 | |
| 783 | if (error) { |
| 784 | (void) ide_dump_status(drive, "set_drive_speed_status", stat); |
| 785 | return error; |
| 786 | } |
| 787 | |
| 788 | id[ATA_ID_UDMA_MODES] &= ~0xFF00; |
| 789 | id[ATA_ID_MWDMA_MODES] &= ~0x0F00; |
| 790 | id[ATA_ID_SWDMA_MODES] &= ~0x0F00; |
| 791 | |
| 792 | skip: |
| 793 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 794 | if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) |
| 795 | hwif->dma_ops->dma_host_set(drive, 1); |
| 796 | else if (hwif->dma_ops) /* check if host supports DMA */ |
| 797 | ide_dma_off_quietly(drive); |
| 798 | #endif |
| 799 | |
| 800 | if (speed >= XFER_UDMA_0) { |
| 801 | i = 1 << (speed - XFER_UDMA_0); |
| 802 | id[ATA_ID_UDMA_MODES] |= (i << 8 | i); |
| 803 | } else if (speed >= XFER_MW_DMA_0) { |
| 804 | i = 1 << (speed - XFER_MW_DMA_0); |
| 805 | id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); |
| 806 | } else if (speed >= XFER_SW_DMA_0) { |
| 807 | i = 1 << (speed - XFER_SW_DMA_0); |
| 808 | id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); |
| 809 | } |
| 810 | |
| 811 | if (!drive->init_speed) |
| 812 | drive->init_speed = speed; |
| 813 | drive->current_speed = speed; |
| 814 | return error; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * This should get invoked any time we exit the driver to |
| 819 | * wait for an interrupt response from a drive. handler() points |
| 820 | * at the appropriate code to handle the next interrupt, and a |
| 821 | * timer is started to prevent us from waiting forever in case |
| 822 | * something goes wrong (see the ide_timer_expiry() handler later on). |
| 823 | * |
| 824 | * See also ide_execute_command |
| 825 | */ |
| 826 | static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, |
| 827 | unsigned int timeout, ide_expiry_t *expiry) |
| 828 | { |
| 829 | ide_hwgroup_t *hwgroup = HWGROUP(drive); |
| 830 | |
| 831 | BUG_ON(hwgroup->handler); |
| 832 | hwgroup->handler = handler; |
| 833 | hwgroup->expiry = expiry; |
| 834 | hwgroup->timer.expires = jiffies + timeout; |
| 835 | hwgroup->req_gen_timer = hwgroup->req_gen; |
| 836 | add_timer(&hwgroup->timer); |
| 837 | } |
| 838 | |
| 839 | void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, |
| 840 | unsigned int timeout, ide_expiry_t *expiry) |
| 841 | { |
| 842 | unsigned long flags; |
| 843 | spin_lock_irqsave(&ide_lock, flags); |
| 844 | __ide_set_handler(drive, handler, timeout, expiry); |
| 845 | spin_unlock_irqrestore(&ide_lock, flags); |
| 846 | } |
| 847 | |
| 848 | EXPORT_SYMBOL(ide_set_handler); |
| 849 | |
| 850 | /** |
| 851 | * ide_execute_command - execute an IDE command |
| 852 | * @drive: IDE drive to issue the command against |
| 853 | * @command: command byte to write |
| 854 | * @handler: handler for next phase |
| 855 | * @timeout: timeout for command |
| 856 | * @expiry: handler to run on timeout |
| 857 | * |
| 858 | * Helper function to issue an IDE command. This handles the |
| 859 | * atomicity requirements, command timing and ensures that the |
| 860 | * handler and IRQ setup do not race. All IDE command kick off |
| 861 | * should go via this function or do equivalent locking. |
| 862 | */ |
| 863 | |
| 864 | void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler, |
| 865 | unsigned timeout, ide_expiry_t *expiry) |
| 866 | { |
| 867 | unsigned long flags; |
| 868 | ide_hwif_t *hwif = HWIF(drive); |
| 869 | |
| 870 | spin_lock_irqsave(&ide_lock, flags); |
| 871 | __ide_set_handler(drive, handler, timeout, expiry); |
| 872 | hwif->tp_ops->exec_command(hwif, cmd); |
| 873 | /* |
| 874 | * Drive takes 400nS to respond, we must avoid the IRQ being |
| 875 | * serviced before that. |
| 876 | * |
| 877 | * FIXME: we could skip this delay with care on non shared devices |
| 878 | */ |
| 879 | ndelay(400); |
| 880 | spin_unlock_irqrestore(&ide_lock, flags); |
| 881 | } |
| 882 | EXPORT_SYMBOL(ide_execute_command); |
| 883 | |
| 884 | void ide_execute_pkt_cmd(ide_drive_t *drive) |
| 885 | { |
| 886 | ide_hwif_t *hwif = drive->hwif; |
| 887 | unsigned long flags; |
| 888 | |
| 889 | spin_lock_irqsave(&ide_lock, flags); |
| 890 | hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET); |
| 891 | ndelay(400); |
| 892 | spin_unlock_irqrestore(&ide_lock, flags); |
| 893 | } |
| 894 | EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd); |
| 895 | |
| 896 | static inline void ide_complete_drive_reset(ide_drive_t *drive, int err) |
| 897 | { |
| 898 | struct request *rq = drive->hwif->hwgroup->rq; |
| 899 | |
| 900 | if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET) |
| 901 | ide_end_request(drive, err ? err : 1, 0); |
| 902 | } |
| 903 | |
| 904 | /* needed below */ |
| 905 | static ide_startstop_t do_reset1 (ide_drive_t *, int); |
| 906 | |
| 907 | /* |
| 908 | * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms |
| 909 | * during an atapi drive reset operation. If the drive has not yet responded, |
| 910 | * and we have not yet hit our maximum waiting time, then the timer is restarted |
| 911 | * for another 50ms. |
| 912 | */ |
| 913 | static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive) |
| 914 | { |
| 915 | ide_hwif_t *hwif = drive->hwif; |
| 916 | ide_hwgroup_t *hwgroup = hwif->hwgroup; |
| 917 | u8 stat; |
| 918 | |
| 919 | SELECT_DRIVE(drive); |
| 920 | udelay (10); |
| 921 | stat = hwif->tp_ops->read_status(hwif); |
| 922 | |
| 923 | if (OK_STAT(stat, 0, ATA_BUSY)) |
| 924 | printk("%s: ATAPI reset complete\n", drive->name); |
| 925 | else { |
| 926 | if (time_before(jiffies, hwgroup->poll_timeout)) { |
| 927 | ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); |
| 928 | /* continue polling */ |
| 929 | return ide_started; |
| 930 | } |
| 931 | /* end of polling */ |
| 932 | hwgroup->polling = 0; |
| 933 | printk("%s: ATAPI reset timed-out, status=0x%02x\n", |
| 934 | drive->name, stat); |
| 935 | /* do it the old fashioned way */ |
| 936 | return do_reset1(drive, 1); |
| 937 | } |
| 938 | /* done polling */ |
| 939 | hwgroup->polling = 0; |
| 940 | ide_complete_drive_reset(drive, 0); |
| 941 | return ide_stopped; |
| 942 | } |
| 943 | |
| 944 | static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) |
| 945 | { |
| 946 | static const char *err_master_vals[] = |
| 947 | { NULL, "passed", "formatter device error", |
| 948 | "sector buffer error", "ECC circuitry error", |
| 949 | "controlling MPU error" }; |
| 950 | |
| 951 | u8 err_master = err & 0x7f; |
| 952 | |
| 953 | printk(KERN_ERR "%s: reset: master: ", hwif->name); |
| 954 | if (err_master && err_master < 6) |
| 955 | printk(KERN_CONT "%s", err_master_vals[err_master]); |
| 956 | else |
| 957 | printk(KERN_CONT "error (0x%02x?)", err); |
| 958 | if (err & 0x80) |
| 959 | printk(KERN_CONT "; slave: failed"); |
| 960 | printk(KERN_CONT "\n"); |
| 961 | } |
| 962 | |
| 963 | /* |
| 964 | * reset_pollfunc() gets invoked to poll the interface for completion every 50ms |
| 965 | * during an ide reset operation. If the drives have not yet responded, |
| 966 | * and we have not yet hit our maximum waiting time, then the timer is restarted |
| 967 | * for another 50ms. |
| 968 | */ |
| 969 | static ide_startstop_t reset_pollfunc (ide_drive_t *drive) |
| 970 | { |
| 971 | ide_hwgroup_t *hwgroup = HWGROUP(drive); |
| 972 | ide_hwif_t *hwif = HWIF(drive); |
| 973 | const struct ide_port_ops *port_ops = hwif->port_ops; |
| 974 | u8 tmp; |
| 975 | int err = 0; |
| 976 | |
| 977 | if (port_ops && port_ops->reset_poll) { |
| 978 | err = port_ops->reset_poll(drive); |
| 979 | if (err) { |
| 980 | printk(KERN_ERR "%s: host reset_poll failure for %s.\n", |
| 981 | hwif->name, drive->name); |
| 982 | goto out; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | tmp = hwif->tp_ops->read_status(hwif); |
| 987 | |
| 988 | if (!OK_STAT(tmp, 0, ATA_BUSY)) { |
| 989 | if (time_before(jiffies, hwgroup->poll_timeout)) { |
| 990 | ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); |
| 991 | /* continue polling */ |
| 992 | return ide_started; |
| 993 | } |
| 994 | printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp); |
| 995 | drive->failures++; |
| 996 | err = -EIO; |
| 997 | } else { |
| 998 | tmp = ide_read_error(drive); |
| 999 | |
| 1000 | if (tmp == 1) { |
| 1001 | printk(KERN_INFO "%s: reset: success\n", hwif->name); |
| 1002 | drive->failures = 0; |
| 1003 | } else { |
| 1004 | ide_reset_report_error(hwif, tmp); |
| 1005 | drive->failures++; |
| 1006 | err = -EIO; |
| 1007 | } |
| 1008 | } |
| 1009 | out: |
| 1010 | hwgroup->polling = 0; /* done polling */ |
| 1011 | ide_complete_drive_reset(drive, err); |
| 1012 | return ide_stopped; |
| 1013 | } |
| 1014 | |
| 1015 | static void ide_disk_pre_reset(ide_drive_t *drive) |
| 1016 | { |
| 1017 | int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; |
| 1018 | |
| 1019 | drive->special.all = 0; |
| 1020 | drive->special.b.set_geometry = legacy; |
| 1021 | drive->special.b.recalibrate = legacy; |
| 1022 | |
| 1023 | drive->mult_count = 0; |
| 1024 | drive->dev_flags &= ~IDE_DFLAG_PARKED; |
| 1025 | |
| 1026 | if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && |
| 1027 | (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) |
| 1028 | drive->mult_req = 0; |
| 1029 | |
| 1030 | if (drive->mult_req != drive->mult_count) |
| 1031 | drive->special.b.set_multmode = 1; |
| 1032 | } |
| 1033 | |
| 1034 | static void pre_reset(ide_drive_t *drive) |
| 1035 | { |
| 1036 | const struct ide_port_ops *port_ops = drive->hwif->port_ops; |
| 1037 | |
| 1038 | if (drive->media == ide_disk) |
| 1039 | ide_disk_pre_reset(drive); |
| 1040 | else |
| 1041 | drive->dev_flags |= IDE_DFLAG_POST_RESET; |
| 1042 | |
| 1043 | if (drive->dev_flags & IDE_DFLAG_USING_DMA) { |
| 1044 | if (drive->crc_count) |
| 1045 | ide_check_dma_crc(drive); |
| 1046 | else |
| 1047 | ide_dma_off(drive); |
| 1048 | } |
| 1049 | |
| 1050 | if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { |
| 1051 | if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { |
| 1052 | drive->dev_flags &= ~IDE_DFLAG_UNMASK; |
| 1053 | drive->io_32bit = 0; |
| 1054 | } |
| 1055 | return; |
| 1056 | } |
| 1057 | |
| 1058 | if (port_ops && port_ops->pre_reset) |
| 1059 | port_ops->pre_reset(drive); |
| 1060 | |
| 1061 | if (drive->current_speed != 0xff) |
| 1062 | drive->desired_speed = drive->current_speed; |
| 1063 | drive->current_speed = 0xff; |
| 1064 | } |
| 1065 | |
| 1066 | /* |
| 1067 | * do_reset1() attempts to recover a confused drive by resetting it. |
| 1068 | * Unfortunately, resetting a disk drive actually resets all devices on |
| 1069 | * the same interface, so it can really be thought of as resetting the |
| 1070 | * interface rather than resetting the drive. |
| 1071 | * |
| 1072 | * ATAPI devices have their own reset mechanism which allows them to be |
| 1073 | * individually reset without clobbering other devices on the same interface. |
| 1074 | * |
| 1075 | * Unfortunately, the IDE interface does not generate an interrupt to let |
| 1076 | * us know when the reset operation has finished, so we must poll for this. |
| 1077 | * Equally poor, though, is the fact that this may a very long time to complete, |
| 1078 | * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, |
| 1079 | * we set a timer to poll at 50ms intervals. |
| 1080 | */ |
| 1081 | static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi) |
| 1082 | { |
| 1083 | unsigned int unit; |
| 1084 | unsigned long flags, timeout; |
| 1085 | ide_hwif_t *hwif; |
| 1086 | ide_hwgroup_t *hwgroup; |
| 1087 | struct ide_io_ports *io_ports; |
| 1088 | const struct ide_tp_ops *tp_ops; |
| 1089 | const struct ide_port_ops *port_ops; |
| 1090 | DEFINE_WAIT(wait); |
| 1091 | |
| 1092 | spin_lock_irqsave(&ide_lock, flags); |
| 1093 | hwif = HWIF(drive); |
| 1094 | hwgroup = HWGROUP(drive); |
| 1095 | |
| 1096 | io_ports = &hwif->io_ports; |
| 1097 | |
| 1098 | tp_ops = hwif->tp_ops; |
| 1099 | |
| 1100 | /* We must not reset with running handlers */ |
| 1101 | BUG_ON(hwgroup->handler != NULL); |
| 1102 | |
| 1103 | /* For an ATAPI device, first try an ATAPI SRST. */ |
| 1104 | if (drive->media != ide_disk && !do_not_try_atapi) { |
| 1105 | pre_reset(drive); |
| 1106 | SELECT_DRIVE(drive); |
| 1107 | udelay (20); |
| 1108 | tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); |
| 1109 | ndelay(400); |
| 1110 | hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE; |
| 1111 | hwgroup->polling = 1; |
| 1112 | __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); |
| 1113 | spin_unlock_irqrestore(&ide_lock, flags); |
| 1114 | return ide_started; |
| 1115 | } |
| 1116 | |
| 1117 | /* We must not disturb devices in the IDE_DFLAG_PARKED state. */ |
| 1118 | do { |
| 1119 | unsigned long now; |
| 1120 | |
| 1121 | prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); |
| 1122 | timeout = jiffies; |
| 1123 | for (unit = 0; unit < MAX_DRIVES; unit++) { |
| 1124 | ide_drive_t *tdrive = &hwif->drives[unit]; |
| 1125 | |
| 1126 | if (tdrive->dev_flags & IDE_DFLAG_PRESENT && |
| 1127 | tdrive->dev_flags & IDE_DFLAG_PARKED && |
| 1128 | time_after(tdrive->sleep, timeout)) |
| 1129 | timeout = tdrive->sleep; |
| 1130 | } |
| 1131 | |
| 1132 | now = jiffies; |
| 1133 | if (time_before_eq(timeout, now)) |
| 1134 | break; |
| 1135 | |
| 1136 | spin_unlock_irqrestore(&ide_lock, flags); |
| 1137 | timeout = schedule_timeout_uninterruptible(timeout - now); |
| 1138 | spin_lock_irqsave(&ide_lock, flags); |
| 1139 | } while (timeout); |
| 1140 | finish_wait(&ide_park_wq, &wait); |
| 1141 | |
| 1142 | /* |
| 1143 | * First, reset any device state data we were maintaining |
| 1144 | * for any of the drives on this interface. |
| 1145 | */ |
| 1146 | for (unit = 0; unit < MAX_DRIVES; ++unit) |
| 1147 | pre_reset(&hwif->drives[unit]); |
| 1148 | |
| 1149 | if (io_ports->ctl_addr == 0) { |
| 1150 | spin_unlock_irqrestore(&ide_lock, flags); |
| 1151 | ide_complete_drive_reset(drive, -ENXIO); |
| 1152 | return ide_stopped; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Note that we also set nIEN while resetting the device, |
| 1157 | * to mask unwanted interrupts from the interface during the reset. |
| 1158 | * However, due to the design of PC hardware, this will cause an |
| 1159 | * immediate interrupt due to the edge transition it produces. |
| 1160 | * This single interrupt gives us a "fast poll" for drives that |
| 1161 | * recover from reset very quickly, saving us the first 50ms wait time. |
| 1162 | * |
| 1163 | * TODO: add ->softreset method and stop abusing ->set_irq |
| 1164 | */ |
| 1165 | /* set SRST and nIEN */ |
| 1166 | tp_ops->set_irq(hwif, 4); |
| 1167 | /* more than enough time */ |
| 1168 | udelay(10); |
| 1169 | /* clear SRST, leave nIEN (unless device is on the quirk list) */ |
| 1170 | tp_ops->set_irq(hwif, drive->quirk_list == 2); |
| 1171 | /* more than enough time */ |
| 1172 | udelay(10); |
| 1173 | hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE; |
| 1174 | hwgroup->polling = 1; |
| 1175 | __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); |
| 1176 | |
| 1177 | /* |
| 1178 | * Some weird controller like resetting themselves to a strange |
| 1179 | * state when the disks are reset this way. At least, the Winbond |
| 1180 | * 553 documentation says that |
| 1181 | */ |
| 1182 | port_ops = hwif->port_ops; |
| 1183 | if (port_ops && port_ops->resetproc) |
| 1184 | port_ops->resetproc(drive); |
| 1185 | |
| 1186 | spin_unlock_irqrestore(&ide_lock, flags); |
| 1187 | return ide_started; |
| 1188 | } |
| 1189 | |
| 1190 | /* |
| 1191 | * ide_do_reset() is the entry point to the drive/interface reset code. |
| 1192 | */ |
| 1193 | |
| 1194 | ide_startstop_t ide_do_reset (ide_drive_t *drive) |
| 1195 | { |
| 1196 | return do_reset1(drive, 0); |
| 1197 | } |
| 1198 | |
| 1199 | EXPORT_SYMBOL(ide_do_reset); |
| 1200 | |
| 1201 | /* |
| 1202 | * ide_wait_not_busy() waits for the currently selected device on the hwif |
| 1203 | * to report a non-busy status, see comments in ide_probe_port(). |
| 1204 | */ |
| 1205 | int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) |
| 1206 | { |
| 1207 | u8 stat = 0; |
| 1208 | |
| 1209 | while(timeout--) { |
| 1210 | /* |
| 1211 | * Turn this into a schedule() sleep once I'm sure |
| 1212 | * about locking issues (2.5 work ?). |
| 1213 | */ |
| 1214 | mdelay(1); |
| 1215 | stat = hwif->tp_ops->read_status(hwif); |
| 1216 | if ((stat & ATA_BUSY) == 0) |
| 1217 | return 0; |
| 1218 | /* |
| 1219 | * Assume a value of 0xff means nothing is connected to |
| 1220 | * the interface and it doesn't implement the pull-down |
| 1221 | * resistor on D7. |
| 1222 | */ |
| 1223 | if (stat == 0xff) |
| 1224 | return -ENODEV; |
| 1225 | touch_softlockup_watchdog(); |
| 1226 | touch_nmi_watchdog(); |
| 1227 | } |
| 1228 | return -EBUSY; |
| 1229 | } |
| 1230 | |
| 1231 | EXPORT_SYMBOL_GPL(ide_wait_not_busy); |
| 1232 | |