2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 2003 Red Hat <alan@redhat.com>
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>
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/hdreg.h>
22 #include <linux/ide.h>
23 #include <linux/bitops.h>
24 #include <linux/nmi.h>
26 #include <asm/byteorder.h>
28 #include <asm/uaccess.h>
32 * Conventional PIO operations for ATA devices
35 static u8 ide_inb (unsigned long port)
37 return (u8) inb(port);
40 static u16 ide_inw (unsigned long port)
42 return (u16) inw(port);
45 static void ide_insw (unsigned long port, void *addr, u32 count)
47 insw(port, addr, count);
50 static void ide_insl (unsigned long port, void *addr, u32 count)
52 insl(port, addr, count);
55 static void ide_outb (u8 val, unsigned long port)
60 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
65 static void ide_outw (u16 val, unsigned long port)
70 static void ide_outsw (unsigned long port, void *addr, u32 count)
72 outsw(port, addr, count);
75 static void ide_outsl (unsigned long port, void *addr, u32 count)
77 outsl(port, addr, count);
80 void default_hwif_iops (ide_hwif_t *hwif)
82 hwif->OUTB = ide_outb;
83 hwif->OUTBSYNC = ide_outbsync;
84 hwif->OUTW = ide_outw;
85 hwif->OUTSW = ide_outsw;
86 hwif->OUTSL = ide_outsl;
89 hwif->INSW = ide_insw;
90 hwif->INSL = ide_insl;
94 * MMIO operations, typically used for SATA controllers
97 static u8 ide_mm_inb (unsigned long port)
99 return (u8) readb((void __iomem *) port);
102 static u16 ide_mm_inw (unsigned long port)
104 return (u16) readw((void __iomem *) port);
107 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
109 __ide_mm_insw((void __iomem *) port, addr, count);
112 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
114 __ide_mm_insl((void __iomem *) port, addr, count);
117 static void ide_mm_outb (u8 value, unsigned long port)
119 writeb(value, (void __iomem *) port);
122 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
124 writeb(value, (void __iomem *) port);
127 static void ide_mm_outw (u16 value, unsigned long port)
129 writew(value, (void __iomem *) port);
132 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
134 __ide_mm_outsw((void __iomem *) port, addr, count);
137 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
139 __ide_mm_outsl((void __iomem *) port, addr, count);
142 void default_hwif_mmiops (ide_hwif_t *hwif)
144 hwif->OUTB = ide_mm_outb;
145 /* Most systems will need to override OUTBSYNC, alas however
146 this one is controller specific! */
147 hwif->OUTBSYNC = ide_mm_outbsync;
148 hwif->OUTW = ide_mm_outw;
149 hwif->OUTSW = ide_mm_outsw;
150 hwif->OUTSL = ide_mm_outsl;
151 hwif->INB = ide_mm_inb;
152 hwif->INW = ide_mm_inw;
153 hwif->INSW = ide_mm_insw;
154 hwif->INSL = ide_mm_insl;
157 EXPORT_SYMBOL(default_hwif_mmiops);
159 void SELECT_DRIVE (ide_drive_t *drive)
161 ide_hwif_t *hwif = drive->hwif;
162 const struct ide_port_ops *port_ops = hwif->port_ops;
164 if (port_ops && port_ops->selectproc)
165 port_ops->selectproc(drive);
167 hwif->OUTB(drive->select.all, hwif->io_ports.device_addr);
170 void SELECT_MASK (ide_drive_t *drive, int mask)
172 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
174 if (port_ops && port_ops->maskproc)
175 port_ops->maskproc(drive, mask);
179 * Some localbus EIDE interfaces require a special access sequence
180 * when using 32-bit I/O instructions to transfer data. We call this
181 * the "vlb_sync" sequence, which consists of three successive reads
182 * of the sector count register location, with interrupts disabled
183 * to ensure that the reads all happen together.
185 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
187 (void) HWIF(drive)->INB(port);
188 (void) HWIF(drive)->INB(port);
189 (void) HWIF(drive)->INB(port);
193 * This is used for most PIO data transfers *from* the IDE interface
195 * These routines will round up any request for an odd number of bytes,
196 * so if an odd len is specified, be sure that there's at least one
197 * extra byte allocated for the buffer.
199 static void ata_input_data(ide_drive_t *drive, struct request *rq,
200 void *buf, unsigned int len)
202 ide_hwif_t *hwif = drive->hwif;
203 struct ide_io_ports *io_ports = &hwif->io_ports;
204 unsigned long data_addr = io_ports->data_addr;
205 u8 io_32bit = drive->io_32bit;
213 local_irq_save(flags);
214 ata_vlb_sync(drive, io_ports->nsect_addr);
215 hwif->INSL(data_addr, buf, len / 4);
216 local_irq_restore(flags);
218 hwif->INSL(data_addr, buf, len / 4);
221 hwif->INSW(data_addr, (u8 *)buf + (len & ~3), 1);
223 hwif->INSW(data_addr, buf, len / 2);
227 * This is used for most PIO data transfers *to* the IDE interface
229 static void ata_output_data(ide_drive_t *drive, struct request *rq,
230 void *buf, unsigned int len)
232 ide_hwif_t *hwif = drive->hwif;
233 struct ide_io_ports *io_ports = &hwif->io_ports;
234 unsigned long data_addr = io_ports->data_addr;
235 u8 io_32bit = drive->io_32bit;
241 local_irq_save(flags);
242 ata_vlb_sync(drive, io_ports->nsect_addr);
243 hwif->OUTSL(data_addr, buf, len / 4);
244 local_irq_restore(flags);
246 hwif->OUTSL(data_addr, buf, len / 4);
249 hwif->OUTSW(data_addr, (u8 *)buf + (len & ~3), 1);
251 hwif->OUTSW(data_addr, buf, len / 2);
254 void default_hwif_transport(ide_hwif_t *hwif)
256 hwif->input_data = ata_input_data;
257 hwif->output_data = ata_output_data;
260 void ide_fix_driveid (struct hd_driveid *id)
262 #ifndef __LITTLE_ENDIAN
267 id->config = __le16_to_cpu(id->config);
268 id->cyls = __le16_to_cpu(id->cyls);
269 id->reserved2 = __le16_to_cpu(id->reserved2);
270 id->heads = __le16_to_cpu(id->heads);
271 id->track_bytes = __le16_to_cpu(id->track_bytes);
272 id->sector_bytes = __le16_to_cpu(id->sector_bytes);
273 id->sectors = __le16_to_cpu(id->sectors);
274 id->vendor0 = __le16_to_cpu(id->vendor0);
275 id->vendor1 = __le16_to_cpu(id->vendor1);
276 id->vendor2 = __le16_to_cpu(id->vendor2);
277 stringcast = (u16 *)&id->serial_no[0];
278 for (i = 0; i < (20/2); i++)
279 stringcast[i] = __le16_to_cpu(stringcast[i]);
280 id->buf_type = __le16_to_cpu(id->buf_type);
281 id->buf_size = __le16_to_cpu(id->buf_size);
282 id->ecc_bytes = __le16_to_cpu(id->ecc_bytes);
283 stringcast = (u16 *)&id->fw_rev[0];
284 for (i = 0; i < (8/2); i++)
285 stringcast[i] = __le16_to_cpu(stringcast[i]);
286 stringcast = (u16 *)&id->model[0];
287 for (i = 0; i < (40/2); i++)
288 stringcast[i] = __le16_to_cpu(stringcast[i]);
289 id->dword_io = __le16_to_cpu(id->dword_io);
290 id->reserved50 = __le16_to_cpu(id->reserved50);
291 id->field_valid = __le16_to_cpu(id->field_valid);
292 id->cur_cyls = __le16_to_cpu(id->cur_cyls);
293 id->cur_heads = __le16_to_cpu(id->cur_heads);
294 id->cur_sectors = __le16_to_cpu(id->cur_sectors);
295 id->cur_capacity0 = __le16_to_cpu(id->cur_capacity0);
296 id->cur_capacity1 = __le16_to_cpu(id->cur_capacity1);
297 id->lba_capacity = __le32_to_cpu(id->lba_capacity);
298 id->dma_1word = __le16_to_cpu(id->dma_1word);
299 id->dma_mword = __le16_to_cpu(id->dma_mword);
300 id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
301 id->eide_dma_min = __le16_to_cpu(id->eide_dma_min);
302 id->eide_dma_time = __le16_to_cpu(id->eide_dma_time);
303 id->eide_pio = __le16_to_cpu(id->eide_pio);
304 id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
305 for (i = 0; i < 2; ++i)
306 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
307 for (i = 0; i < 4; ++i)
308 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
309 id->queue_depth = __le16_to_cpu(id->queue_depth);
310 for (i = 0; i < 4; ++i)
311 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
312 id->major_rev_num = __le16_to_cpu(id->major_rev_num);
313 id->minor_rev_num = __le16_to_cpu(id->minor_rev_num);
314 id->command_set_1 = __le16_to_cpu(id->command_set_1);
315 id->command_set_2 = __le16_to_cpu(id->command_set_2);
316 id->cfsse = __le16_to_cpu(id->cfsse);
317 id->cfs_enable_1 = __le16_to_cpu(id->cfs_enable_1);
318 id->cfs_enable_2 = __le16_to_cpu(id->cfs_enable_2);
319 id->csf_default = __le16_to_cpu(id->csf_default);
320 id->dma_ultra = __le16_to_cpu(id->dma_ultra);
321 id->trseuc = __le16_to_cpu(id->trseuc);
322 id->trsEuc = __le16_to_cpu(id->trsEuc);
323 id->CurAPMvalues = __le16_to_cpu(id->CurAPMvalues);
324 id->mprc = __le16_to_cpu(id->mprc);
325 id->hw_config = __le16_to_cpu(id->hw_config);
326 id->acoustic = __le16_to_cpu(id->acoustic);
327 id->msrqs = __le16_to_cpu(id->msrqs);
328 id->sxfert = __le16_to_cpu(id->sxfert);
329 id->sal = __le16_to_cpu(id->sal);
330 id->spg = __le32_to_cpu(id->spg);
331 id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
332 for (i = 0; i < 22; i++)
333 id->words104_125[i] = __le16_to_cpu(id->words104_125[i]);
334 id->last_lun = __le16_to_cpu(id->last_lun);
335 id->word127 = __le16_to_cpu(id->word127);
336 id->dlf = __le16_to_cpu(id->dlf);
337 id->csfo = __le16_to_cpu(id->csfo);
338 for (i = 0; i < 26; i++)
339 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
340 id->word156 = __le16_to_cpu(id->word156);
341 for (i = 0; i < 3; i++)
342 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
343 id->cfa_power = __le16_to_cpu(id->cfa_power);
344 for (i = 0; i < 14; i++)
345 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
346 for (i = 0; i < 31; i++)
347 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
348 for (i = 0; i < 48; i++)
349 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
350 id->integrity_word = __le16_to_cpu(id->integrity_word);
352 # error "Please fix <asm/byteorder.h>"
358 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
359 * removing leading/trailing blanks and compressing internal blanks.
360 * It is primarily used to tidy up the model name/number fields as
361 * returned by the WIN_[P]IDENTIFY commands.
364 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
366 u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
369 /* convert from big-endian to host byte order */
370 for (p = end ; p != s;) {
371 unsigned short *pp = (unsigned short *) (p -= 2);
375 /* strip leading blanks */
376 while (s != end && *s == ' ')
378 /* compress internal blanks and strip trailing blanks */
379 while (s != end && *s) {
380 if (*s++ != ' ' || (s != end && *s && *s != ' '))
383 /* wipe out trailing garbage */
388 EXPORT_SYMBOL(ide_fixstring);
391 * Needed for PCI irq sharing
393 int drive_is_ready (ide_drive_t *drive)
395 ide_hwif_t *hwif = HWIF(drive);
398 if (drive->waiting_for_dma)
399 return hwif->dma_ops->dma_test_irq(drive);
402 /* need to guarantee 400ns since last command was issued */
407 * We do a passive status test under shared PCI interrupts on
408 * cards that truly share the ATA side interrupt, but may also share
409 * an interrupt with another pci card/device. We make no assumptions
410 * about possible isa-pnp and pci-pnp issues yet.
412 if (hwif->io_ports.ctl_addr)
413 stat = ide_read_altstatus(drive);
415 /* Note: this may clear a pending IRQ!! */
416 stat = ide_read_status(drive);
418 if (stat & BUSY_STAT)
419 /* drive busy: definitely not interrupting */
422 /* drive ready: *might* be interrupting */
426 EXPORT_SYMBOL(drive_is_ready);
429 * This routine busy-waits for the drive status to be not "busy".
430 * It then checks the status for all of the "good" bits and none
431 * of the "bad" bits, and if all is okay it returns 0. All other
432 * cases return error -- caller may then invoke ide_error().
434 * This routine should get fixed to not hog the cpu during extra long waits..
435 * That could be done by busy-waiting for the first jiffy or two, and then
436 * setting a timer to wake up at half second intervals thereafter,
437 * until timeout is achieved, before timing out.
439 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
445 udelay(1); /* spec allows drive 400ns to assert "BUSY" */
446 stat = ide_read_status(drive);
448 if (stat & BUSY_STAT) {
449 local_irq_set(flags);
451 while ((stat = ide_read_status(drive)) & BUSY_STAT) {
452 if (time_after(jiffies, timeout)) {
454 * One last read after the timeout in case
455 * heavy interrupt load made us not make any
456 * progress during the timeout..
458 stat = ide_read_status(drive);
459 if (!(stat & BUSY_STAT))
462 local_irq_restore(flags);
467 local_irq_restore(flags);
470 * Allow status to settle, then read it again.
471 * A few rare drives vastly violate the 400ns spec here,
472 * so we'll wait up to 10usec for a "good" status
473 * rather than expensively fail things immediately.
474 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
476 for (i = 0; i < 10; i++) {
478 stat = ide_read_status(drive);
480 if (OK_STAT(stat, good, bad)) {
490 * In case of error returns error value after doing "*startstop = ide_error()".
491 * The caller should return the updated value of "startstop" in this case,
492 * "startstop" is unchanged when the function returns 0.
494 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
499 /* bail early if we've exceeded max_failures */
500 if (drive->max_failures && (drive->failures > drive->max_failures)) {
501 *startstop = ide_stopped;
505 err = __ide_wait_stat(drive, good, bad, timeout, &stat);
508 char *s = (err == -EBUSY) ? "status timeout" : "status error";
509 *startstop = ide_error(drive, s, stat);
515 EXPORT_SYMBOL(ide_wait_stat);
518 * ide_in_drive_list - look for drive in black/white list
519 * @id: drive identifier
520 * @drive_table: list to inspect
522 * Look for a drive in the blacklist and the whitelist tables
523 * Returns 1 if the drive is found in the table.
526 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
528 for ( ; drive_table->id_model; drive_table++)
529 if ((!strcmp(drive_table->id_model, id->model)) &&
530 (!drive_table->id_firmware ||
531 strstr(id->fw_rev, drive_table->id_firmware)))
536 EXPORT_SYMBOL_GPL(ide_in_drive_list);
539 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
540 * We list them here and depend on the device side cable detection for them.
542 * Some optical devices with the buggy firmwares have the same problem.
544 static const struct drive_list_entry ivb_list[] = {
545 { "QUANTUM FIREBALLlct10 05" , "A03.0900" },
546 { "TSSTcorp CDDVDW SH-S202J" , "SB00" },
547 { "TSSTcorp CDDVDW SH-S202J" , "SB01" },
548 { "TSSTcorp CDDVDW SH-S202N" , "SB00" },
549 { "TSSTcorp CDDVDW SH-S202N" , "SB01" },
554 * All hosts that use the 80c ribbon must use!
555 * The name is derived from upper byte of word 93 and the 80c ribbon.
557 u8 eighty_ninty_three (ide_drive_t *drive)
559 ide_hwif_t *hwif = drive->hwif;
560 struct hd_driveid *id = drive->id;
561 int ivb = ide_in_drive_list(id, ivb_list);
563 if (hwif->cbl == ATA_CBL_PATA40_SHORT)
567 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
570 if (ide_dev_is_sata(id) && !ivb)
573 if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
578 * - change master/slave IDENTIFY order
579 * - force bit13 (80c cable present) check also for !ivb devices
580 * (unless the slave device is pre-ATA3)
582 if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
586 if (drive->udma33_warned == 1)
589 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
590 "limiting max speed to UDMA33\n",
592 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
594 drive->udma33_warned = 1;
599 int ide_driveid_update(ide_drive_t *drive)
601 ide_hwif_t *hwif = drive->hwif;
602 struct hd_driveid *id;
603 unsigned long timeout, flags;
607 * Re-read drive->id for possible DMA mode
608 * change (copied from ide-probe.c)
611 SELECT_MASK(drive, 1);
612 ide_set_irq(drive, 1);
614 hwif->OUTB(WIN_IDENTIFY, hwif->io_ports.command_addr);
615 timeout = jiffies + WAIT_WORSTCASE;
617 if (time_after(jiffies, timeout)) {
618 SELECT_MASK(drive, 0);
619 return 0; /* drive timed-out */
622 msleep(50); /* give drive a breather */
623 stat = ide_read_altstatus(drive);
624 } while (stat & BUSY_STAT);
626 msleep(50); /* wait for IRQ and DRQ_STAT */
627 stat = ide_read_status(drive);
629 if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
630 SELECT_MASK(drive, 0);
631 printk("%s: CHECK for good STATUS\n", drive->name);
634 local_irq_save(flags);
635 SELECT_MASK(drive, 0);
636 id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
638 local_irq_restore(flags);
641 hwif->input_data(drive, NULL, id, SECTOR_SIZE);
642 (void)ide_read_status(drive); /* clear drive IRQ */
644 local_irq_restore(flags);
647 drive->id->dma_ultra = id->dma_ultra;
648 drive->id->dma_mword = id->dma_mword;
649 drive->id->dma_1word = id->dma_1word;
650 /* anything more ? */
653 if (drive->using_dma && ide_id_dma_bug(drive))
660 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
662 ide_hwif_t *hwif = drive->hwif;
663 struct ide_io_ports *io_ports = &hwif->io_ports;
667 // while (HWGROUP(drive)->busy)
670 #ifdef CONFIG_BLK_DEV_IDEDMA
671 if (hwif->dma_ops) /* check if host supports DMA */
672 hwif->dma_ops->dma_host_set(drive, 0);
675 /* Skip setting PIO flow-control modes on pre-EIDE drives */
676 if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
680 * Don't use ide_wait_cmd here - it will
681 * attempt to set_geometry and recalibrate,
682 * but for some reason these don't work at
683 * this point (lost interrupt).
686 * Select the drive, and issue the SETFEATURES command
688 disable_irq_nosync(hwif->irq);
691 * FIXME: we race against the running IRQ here if
692 * this is called from non IRQ context. If we use
693 * disable_irq() we hang on the error path. Work
699 SELECT_MASK(drive, 0);
701 ide_set_irq(drive, 0);
702 hwif->OUTB(speed, io_ports->nsect_addr);
703 hwif->OUTB(SETFEATURES_XFER, io_ports->feature_addr);
704 hwif->OUTBSYNC(drive, WIN_SETFEATURES, io_ports->command_addr);
705 if (drive->quirk_list == 2)
706 ide_set_irq(drive, 1);
708 error = __ide_wait_stat(drive, drive->ready_stat,
709 BUSY_STAT|DRQ_STAT|ERR_STAT,
712 SELECT_MASK(drive, 0);
714 enable_irq(hwif->irq);
717 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
721 drive->id->dma_ultra &= ~0xFF00;
722 drive->id->dma_mword &= ~0x0F00;
723 drive->id->dma_1word &= ~0x0F00;
726 #ifdef CONFIG_BLK_DEV_IDEDMA
727 if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
729 hwif->dma_ops->dma_host_set(drive, 1);
730 else if (hwif->dma_ops) /* check if host supports DMA */
731 ide_dma_off_quietly(drive);
735 case XFER_UDMA_7: drive->id->dma_ultra |= 0x8080; break;
736 case XFER_UDMA_6: drive->id->dma_ultra |= 0x4040; break;
737 case XFER_UDMA_5: drive->id->dma_ultra |= 0x2020; break;
738 case XFER_UDMA_4: drive->id->dma_ultra |= 0x1010; break;
739 case XFER_UDMA_3: drive->id->dma_ultra |= 0x0808; break;
740 case XFER_UDMA_2: drive->id->dma_ultra |= 0x0404; break;
741 case XFER_UDMA_1: drive->id->dma_ultra |= 0x0202; break;
742 case XFER_UDMA_0: drive->id->dma_ultra |= 0x0101; break;
743 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
744 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
745 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
746 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
747 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
748 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
751 if (!drive->init_speed)
752 drive->init_speed = speed;
753 drive->current_speed = speed;
758 * This should get invoked any time we exit the driver to
759 * wait for an interrupt response from a drive. handler() points
760 * at the appropriate code to handle the next interrupt, and a
761 * timer is started to prevent us from waiting forever in case
762 * something goes wrong (see the ide_timer_expiry() handler later on).
764 * See also ide_execute_command
766 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
767 unsigned int timeout, ide_expiry_t *expiry)
769 ide_hwgroup_t *hwgroup = HWGROUP(drive);
771 BUG_ON(hwgroup->handler);
772 hwgroup->handler = handler;
773 hwgroup->expiry = expiry;
774 hwgroup->timer.expires = jiffies + timeout;
775 hwgroup->req_gen_timer = hwgroup->req_gen;
776 add_timer(&hwgroup->timer);
779 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
780 unsigned int timeout, ide_expiry_t *expiry)
783 spin_lock_irqsave(&ide_lock, flags);
784 __ide_set_handler(drive, handler, timeout, expiry);
785 spin_unlock_irqrestore(&ide_lock, flags);
788 EXPORT_SYMBOL(ide_set_handler);
791 * ide_execute_command - execute an IDE command
792 * @drive: IDE drive to issue the command against
793 * @command: command byte to write
794 * @handler: handler for next phase
795 * @timeout: timeout for command
796 * @expiry: handler to run on timeout
798 * Helper function to issue an IDE command. This handles the
799 * atomicity requirements, command timing and ensures that the
800 * handler and IRQ setup do not race. All IDE command kick off
801 * should go via this function or do equivalent locking.
804 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
805 unsigned timeout, ide_expiry_t *expiry)
808 ide_hwif_t *hwif = HWIF(drive);
810 spin_lock_irqsave(&ide_lock, flags);
811 __ide_set_handler(drive, handler, timeout, expiry);
812 hwif->OUTBSYNC(drive, cmd, hwif->io_ports.command_addr);
814 * Drive takes 400nS to respond, we must avoid the IRQ being
815 * serviced before that.
817 * FIXME: we could skip this delay with care on non shared devices
820 spin_unlock_irqrestore(&ide_lock, flags);
823 EXPORT_SYMBOL(ide_execute_command);
827 static ide_startstop_t do_reset1 (ide_drive_t *, int);
830 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
831 * during an atapi drive reset operation. If the drive has not yet responded,
832 * and we have not yet hit our maximum waiting time, then the timer is restarted
835 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
837 ide_hwgroup_t *hwgroup = HWGROUP(drive);
842 stat = ide_read_status(drive);
844 if (OK_STAT(stat, 0, BUSY_STAT))
845 printk("%s: ATAPI reset complete\n", drive->name);
847 if (time_before(jiffies, hwgroup->poll_timeout)) {
848 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
849 /* continue polling */
853 hwgroup->polling = 0;
854 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
856 /* do it the old fashioned way */
857 return do_reset1(drive, 1);
860 hwgroup->polling = 0;
861 hwgroup->resetting = 0;
866 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
867 * during an ide reset operation. If the drives have not yet responded,
868 * and we have not yet hit our maximum waiting time, then the timer is restarted
871 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
873 ide_hwgroup_t *hwgroup = HWGROUP(drive);
874 ide_hwif_t *hwif = HWIF(drive);
875 const struct ide_port_ops *port_ops = hwif->port_ops;
878 if (port_ops && port_ops->reset_poll) {
879 if (port_ops->reset_poll(drive)) {
880 printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
881 hwif->name, drive->name);
886 tmp = ide_read_status(drive);
888 if (!OK_STAT(tmp, 0, BUSY_STAT)) {
889 if (time_before(jiffies, hwgroup->poll_timeout)) {
890 ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
891 /* continue polling */
894 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
897 printk("%s: reset: ", hwif->name);
898 tmp = ide_read_error(drive);
906 switch (tmp & 0x7f) {
907 case 1: printk("passed");
909 case 2: printk("formatter device error");
911 case 3: printk("sector buffer error");
913 case 4: printk("ECC circuitry error");
915 case 5: printk("controlling MPU error");
917 default:printk("error (0x%02x?)", tmp);
920 printk("; slave: failed");
924 hwgroup->polling = 0; /* done polling */
925 hwgroup->resetting = 0; /* done reset attempt */
929 static void ide_disk_pre_reset(ide_drive_t *drive)
931 int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
933 drive->special.all = 0;
934 drive->special.b.set_geometry = legacy;
935 drive->special.b.recalibrate = legacy;
936 drive->mult_count = 0;
937 if (!drive->keep_settings && !drive->using_dma)
939 if (drive->mult_req != drive->mult_count)
940 drive->special.b.set_multmode = 1;
943 static void pre_reset(ide_drive_t *drive)
945 const struct ide_port_ops *port_ops = drive->hwif->port_ops;
947 if (drive->media == ide_disk)
948 ide_disk_pre_reset(drive);
950 drive->post_reset = 1;
952 if (drive->using_dma) {
953 if (drive->crc_count)
954 ide_check_dma_crc(drive);
959 if (!drive->keep_settings) {
960 if (!drive->using_dma) {
967 if (port_ops && port_ops->pre_reset)
968 port_ops->pre_reset(drive);
970 if (drive->current_speed != 0xff)
971 drive->desired_speed = drive->current_speed;
972 drive->current_speed = 0xff;
976 * do_reset1() attempts to recover a confused drive by resetting it.
977 * Unfortunately, resetting a disk drive actually resets all devices on
978 * the same interface, so it can really be thought of as resetting the
979 * interface rather than resetting the drive.
981 * ATAPI devices have their own reset mechanism which allows them to be
982 * individually reset without clobbering other devices on the same interface.
984 * Unfortunately, the IDE interface does not generate an interrupt to let
985 * us know when the reset operation has finished, so we must poll for this.
986 * Equally poor, though, is the fact that this may a very long time to complete,
987 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
988 * we set a timer to poll at 50ms intervals.
990 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
995 ide_hwgroup_t *hwgroup;
996 struct ide_io_ports *io_ports;
997 const struct ide_port_ops *port_ops;
1000 spin_lock_irqsave(&ide_lock, flags);
1002 hwgroup = HWGROUP(drive);
1004 io_ports = &hwif->io_ports;
1006 /* We must not reset with running handlers */
1007 BUG_ON(hwgroup->handler != NULL);
1009 /* For an ATAPI device, first try an ATAPI SRST. */
1010 if (drive->media != ide_disk && !do_not_try_atapi) {
1011 hwgroup->resetting = 1;
1013 SELECT_DRIVE(drive);
1015 hwif->OUTBSYNC(drive, WIN_SRST, io_ports->command_addr);
1017 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1018 hwgroup->polling = 1;
1019 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1020 spin_unlock_irqrestore(&ide_lock, flags);
1025 * First, reset any device state data we were maintaining
1026 * for any of the drives on this interface.
1028 for (unit = 0; unit < MAX_DRIVES; ++unit)
1029 pre_reset(&hwif->drives[unit]);
1031 if (io_ports->ctl_addr == 0) {
1032 spin_unlock_irqrestore(&ide_lock, flags);
1036 hwgroup->resetting = 1;
1038 * Note that we also set nIEN while resetting the device,
1039 * to mask unwanted interrupts from the interface during the reset.
1040 * However, due to the design of PC hardware, this will cause an
1041 * immediate interrupt due to the edge transition it produces.
1042 * This single interrupt gives us a "fast poll" for drives that
1043 * recover from reset very quickly, saving us the first 50ms wait time.
1045 /* set SRST and nIEN */
1046 hwif->OUTBSYNC(drive, drive->ctl|6, io_ports->ctl_addr);
1047 /* more than enough time */
1049 if (drive->quirk_list == 2)
1050 ctl = drive->ctl; /* clear SRST and nIEN */
1052 ctl = drive->ctl | 2; /* clear SRST, leave nIEN */
1053 hwif->OUTBSYNC(drive, ctl, io_ports->ctl_addr);
1054 /* more than enough time */
1056 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1057 hwgroup->polling = 1;
1058 __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1061 * Some weird controller like resetting themselves to a strange
1062 * state when the disks are reset this way. At least, the Winbond
1063 * 553 documentation says that
1065 port_ops = hwif->port_ops;
1066 if (port_ops && port_ops->resetproc)
1067 port_ops->resetproc(drive);
1069 spin_unlock_irqrestore(&ide_lock, flags);
1074 * ide_do_reset() is the entry point to the drive/interface reset code.
1077 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1079 return do_reset1(drive, 0);
1082 EXPORT_SYMBOL(ide_do_reset);
1085 * ide_wait_not_busy() waits for the currently selected device on the hwif
1086 * to report a non-busy status, see comments in ide_probe_port().
1088 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1094 * Turn this into a schedule() sleep once I'm sure
1095 * about locking issues (2.5 work ?).
1098 stat = hwif->INB(hwif->io_ports.status_addr);
1099 if ((stat & BUSY_STAT) == 0)
1102 * Assume a value of 0xff means nothing is connected to
1103 * the interface and it doesn't implement the pull-down
1108 touch_softlockup_watchdog();
1109 touch_nmi_watchdog();
1114 EXPORT_SYMBOL_GPL(ide_wait_not_busy);