2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
11 * See linux/MAINTAINERS for address of current maintainer.
13 * This is the multiple IDE interface driver, as evolved from hd.c.
14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
16 * There can be up to two drives per interface, as per the ATA-2 spec.
22 * | It traverses the request-list, using interrupts to jump between functions.
23 * | As nearly all functions can be called within interrupts, we may not sleep.
24 * | Special care is recommended. Have Fun!
26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
29 * | in the early extended-partition checks and added DM partitions.
31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
34 * | and general streamlining by Mark Lord (mlord@pobox.com).
36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
47 #include <linux/module.h>
48 #include <linux/types.h>
49 #include <linux/string.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/major.h>
53 #include <linux/errno.h>
54 #include <linux/genhd.h>
55 #include <linux/slab.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/ide.h>
59 #include <linux/hdreg.h>
60 #include <linux/completion.h>
61 #include <linux/device.h>
64 /* default maximum number of failures */
65 #define IDE_DEFAULT_MAX_FAILURES 1
67 struct class *ide_port_class;
69 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
70 IDE2_MAJOR, IDE3_MAJOR,
71 IDE4_MAJOR, IDE5_MAJOR,
72 IDE6_MAJOR, IDE7_MAJOR,
73 IDE8_MAJOR, IDE9_MAJOR };
75 DEFINE_MUTEX(ide_cfg_mtx);
77 static void ide_port_init_devices_data(ide_hwif_t *);
80 * Do not even *think* about calling this!
82 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
84 /* bulk initialize hwif & drive info with zeros */
85 memset(hwif, 0, sizeof(ide_hwif_t));
87 /* fill in any non-zero initial values */
89 hwif->major = ide_hwif_to_major[index];
94 hwif->name[3] = '0' + index;
96 init_completion(&hwif->gendev_rel_comp);
98 hwif->tp_ops = &default_tp_ops;
100 ide_port_init_devices_data(hwif);
103 static void ide_port_init_devices_data(ide_hwif_t *hwif)
107 for (unit = 0; unit < MAX_DRIVES; ++unit) {
108 ide_drive_t *drive = &hwif->drives[unit];
109 u8 j = (hwif->index * MAX_DRIVES) + unit;
111 memset(drive, 0, sizeof(*drive));
113 drive->media = ide_disk;
114 drive->select = (unit << 4) | ATA_DEVICE_OBS;
116 drive->ready_stat = ATA_DRDY;
117 drive->bad_wstat = BAD_W_STAT;
118 drive->special.b.recalibrate = 1;
119 drive->special.b.set_geometry = 1;
120 drive->name[0] = 'h';
121 drive->name[1] = 'd';
122 drive->name[2] = 'a' + j;
123 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
125 INIT_LIST_HEAD(&drive->list);
126 init_completion(&drive->gendev_rel_comp);
130 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
134 for (i = 0; i < MAX_DRIVES; i++) {
135 ide_drive_t *drive = &hwif->drives[i];
137 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
138 device_unregister(&drive->gendev);
139 wait_for_completion(&drive->gendev_rel_comp);
144 void ide_port_unregister_devices(ide_hwif_t *hwif)
146 mutex_lock(&ide_cfg_mtx);
147 __ide_port_unregister_devices(hwif);
149 ide_port_init_devices_data(hwif);
150 mutex_unlock(&ide_cfg_mtx);
152 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
155 * ide_unregister - free an IDE interface
156 * @hwif: IDE interface
158 * Perform the final unregister of an IDE interface. At the moment
159 * we don't refcount interfaces so this will also get split up.
162 * The caller must not hold the IDE locks
163 * The drive present/vanishing is not yet properly locked
164 * Take care with the callbacks. These have been split to avoid
165 * deadlocking the IDE layer. The shutdown callback is called
166 * before we take the lock and free resources. It is up to the
167 * caller to be sure there is no pending I/O here, and that
168 * the interface will not be reopened (present/vanishing locking
169 * isn't yet done BTW). After we commit to the final kill we
170 * call the cleanup callback with the ide locks held.
172 * Unregister restores the hwif structures to the default state.
173 * This is raving bonkers.
176 void ide_unregister(ide_hwif_t *hwif)
178 BUG_ON(in_interrupt());
179 BUG_ON(irqs_disabled());
181 mutex_lock(&ide_cfg_mtx);
184 __ide_port_unregister_devices(hwif);
188 ide_proc_unregister_port(hwif);
190 free_irq(hwif->irq, hwif);
192 device_unregister(hwif->portdev);
193 device_unregister(&hwif->gendev);
194 wait_for_completion(&hwif->gendev_rel_comp);
197 * Remove us from the kernel's knowledge
199 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
200 kfree(hwif->sg_table);
201 unregister_blkdev(hwif->major, hwif->name);
203 ide_release_dma_engine(hwif);
205 mutex_unlock(&ide_cfg_mtx);
208 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
210 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
212 hwif->chipset = hw->chipset;
214 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
215 hwif->ack_intr = hw->ack_intr;
216 hwif->config_data = hw->config;
220 * Locks for IDE setting functionality
223 DEFINE_MUTEX(ide_setting_mtx);
225 ide_devset_get(io_32bit, io_32bit);
227 static int set_io_32bit(ide_drive_t *drive, int arg)
229 if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
232 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
235 drive->io_32bit = arg;
240 ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
242 static int set_ksettings(ide_drive_t *drive, int arg)
244 if (arg < 0 || arg > 1)
248 drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
250 drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
255 ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
257 static int set_using_dma(ide_drive_t *drive, int arg)
259 #ifdef CONFIG_BLK_DEV_IDEDMA
262 if (arg < 0 || arg > 1)
265 if (ata_id_has_dma(drive->id) == 0)
268 if (drive->hwif->dma_ops == NULL)
274 if (ide_set_dma(drive))
282 if (arg < 0 || arg > 1)
290 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
292 static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
301 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
304 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
307 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
313 static int set_pio_mode(ide_drive_t *drive, int arg)
315 ide_hwif_t *hwif = drive->hwif;
316 const struct ide_port_ops *port_ops = hwif->port_ops;
318 if (arg < 0 || arg > 255)
321 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
322 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
325 if (set_pio_mode_abuse(drive->hwif, arg)) {
326 if (arg == 8 || arg == 9) {
329 /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
330 spin_lock_irqsave(&hwif->lock, flags);
331 port_ops->set_pio_mode(drive, arg);
332 spin_unlock_irqrestore(&hwif->lock, flags);
334 port_ops->set_pio_mode(drive, arg);
336 int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
338 ide_set_pio(drive, arg);
340 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
349 ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
351 static int set_unmaskirq(ide_drive_t *drive, int arg)
353 if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
356 if (arg < 0 || arg > 1)
360 drive->dev_flags |= IDE_DFLAG_UNMASK;
362 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
367 ide_ext_devset_rw_sync(io_32bit, io_32bit);
368 ide_ext_devset_rw_sync(keepsettings, ksettings);
369 ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
370 ide_ext_devset_rw_sync(using_dma, using_dma);
371 __IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
374 * ide_device_get - get an additional reference to a ide_drive_t
375 * @drive: device to get a reference to
377 * Gets a reference to the ide_drive_t and increments the use count of the
378 * underlying LLDD module.
380 int ide_device_get(ide_drive_t *drive)
382 struct device *host_dev;
383 struct module *module;
385 if (!get_device(&drive->gendev))
388 host_dev = drive->hwif->host->dev[0];
389 module = host_dev ? host_dev->driver->owner : NULL;
391 if (module && !try_module_get(module)) {
392 put_device(&drive->gendev);
398 EXPORT_SYMBOL_GPL(ide_device_get);
401 * ide_device_put - release a reference to a ide_drive_t
402 * @drive: device to release a reference on
404 * Release a reference to the ide_drive_t and decrements the use count of
405 * the underlying LLDD module.
407 void ide_device_put(ide_drive_t *drive)
409 #ifdef CONFIG_MODULE_UNLOAD
410 struct device *host_dev = drive->hwif->host->dev[0];
411 struct module *module = host_dev ? host_dev->driver->owner : NULL;
416 put_device(&drive->gendev);
418 EXPORT_SYMBOL_GPL(ide_device_put);
420 static int ide_bus_match(struct device *dev, struct device_driver *drv)
425 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
427 ide_drive_t *drive = to_ide_device(dev);
429 add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
430 add_uevent_var(env, "DRIVENAME=%s", drive->name);
431 add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
435 static int generic_ide_probe(struct device *dev)
437 ide_drive_t *drive = to_ide_device(dev);
438 ide_driver_t *drv = to_ide_driver(dev->driver);
440 return drv->probe ? drv->probe(drive) : -ENODEV;
443 static int generic_ide_remove(struct device *dev)
445 ide_drive_t *drive = to_ide_device(dev);
446 ide_driver_t *drv = to_ide_driver(dev->driver);
454 static void generic_ide_shutdown(struct device *dev)
456 ide_drive_t *drive = to_ide_device(dev);
457 ide_driver_t *drv = to_ide_driver(dev->driver);
459 if (dev->driver && drv->shutdown)
460 drv->shutdown(drive);
463 struct bus_type ide_bus_type = {
465 .match = ide_bus_match,
466 .uevent = ide_uevent,
467 .probe = generic_ide_probe,
468 .remove = generic_ide_remove,
469 .shutdown = generic_ide_shutdown,
470 .dev_attrs = ide_dev_attrs,
471 .suspend = generic_ide_suspend,
472 .resume = generic_ide_resume,
475 EXPORT_SYMBOL_GPL(ide_bus_type);
478 EXPORT_SYMBOL_GPL(ide_vlb_clk);
480 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
481 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
484 EXPORT_SYMBOL_GPL(ide_pci_clk);
486 module_param_named(pci_clock, ide_pci_clk, int, 0);
487 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
489 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
492 unsigned int *dev_param_mask = (unsigned int *)kp->arg;
494 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
495 sscanf(s, "%d.%d", &a, &b) != 2)
498 i = a * MAX_DRIVES + b;
500 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
504 *dev_param_mask |= (1 << i);
506 *dev_param_mask &= (1 << i);
511 static unsigned int ide_nodma;
513 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
514 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
516 static unsigned int ide_noflush;
518 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
519 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
521 static unsigned int ide_noprobe;
523 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
524 MODULE_PARM_DESC(noprobe, "skip probing for a device");
526 static unsigned int ide_nowerr;
528 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
529 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
531 static unsigned int ide_cdroms;
533 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
534 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
542 static unsigned int ide_disks;
543 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
545 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
547 int a, b, c = 0, h = 0, s = 0, i, j = 1;
549 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
550 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
553 i = a * MAX_DRIVES + b;
555 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
558 if (c > INT_MAX || h > 255 || s > 255)
562 ide_disks |= (1 << i);
564 ide_disks &= (1 << i);
566 ide_disks_chs[i].cyl = c;
567 ide_disks_chs[i].head = h;
568 ide_disks_chs[i].sect = s;
573 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
574 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
576 static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
578 int i = drive->hwif->index * MAX_DRIVES + unit;
580 if (ide_nodma & (1 << i)) {
581 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
582 drive->dev_flags |= IDE_DFLAG_NODMA;
584 if (ide_noflush & (1 << i)) {
585 printk(KERN_INFO "ide: disabling flush requests for %s\n",
587 drive->dev_flags |= IDE_DFLAG_NOFLUSH;
589 if (ide_noprobe & (1 << i)) {
590 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
591 drive->dev_flags |= IDE_DFLAG_NOPROBE;
593 if (ide_nowerr & (1 << i)) {
594 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
596 drive->bad_wstat = BAD_R_STAT;
598 if (ide_cdroms & (1 << i)) {
599 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
600 drive->dev_flags |= IDE_DFLAG_PRESENT;
601 drive->media = ide_cdrom;
602 /* an ATAPI device ignores DRDY */
603 drive->ready_stat = 0;
605 if (ide_disks & (1 << i)) {
606 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
607 drive->head = drive->bios_head = ide_disks_chs[i].head;
608 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
610 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
612 drive->cyl, drive->head, drive->sect);
614 drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
615 drive->media = ide_disk;
616 drive->ready_stat = ATA_DRDY;
620 static unsigned int ide_ignore_cable;
622 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
626 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
629 if (i >= MAX_HWIFS || j < 0 || j > 1)
633 ide_ignore_cable |= (1 << i);
635 ide_ignore_cable &= (1 << i);
640 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
641 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
643 void ide_port_apply_params(ide_hwif_t *hwif)
647 if (ide_ignore_cable & (1 << hwif->index)) {
648 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
650 hwif->cbl = ATA_CBL_PATA40_SHORT;
653 for (i = 0; i < MAX_DRIVES; i++)
654 ide_dev_apply_params(&hwif->drives[i], i);
658 * This is gets invoked once during initialization, to set *everything* up
660 static int __init ide_init(void)
664 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
666 ret = bus_register(&ide_bus_type);
668 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
672 ide_port_class = class_create(THIS_MODULE, "ide_port");
673 if (IS_ERR(ide_port_class)) {
674 ret = PTR_ERR(ide_port_class);
683 bus_unregister(&ide_bus_type);
688 static void __exit ide_exit(void)
692 class_destroy(ide_port_class);
694 bus_unregister(&ide_bus_type);
697 module_init(ide_init);
698 module_exit(ide_exit);
700 MODULE_LICENSE("GPL");