2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyrifht (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 #define _IDE_C /* Tell ide.h it's really us */
49 #include <linux/module.h>
50 #include <linux/types.h>
51 #include <linux/string.h>
52 #include <linux/kernel.h>
53 #include <linux/timer.h>
55 #include <linux/interrupt.h>
56 #include <linux/major.h>
57 #include <linux/errno.h>
58 #include <linux/genhd.h>
59 #include <linux/blkpg.h>
60 #include <linux/slab.h>
61 #include <linux/init.h>
62 #include <linux/pci.h>
63 #include <linux/delay.h>
64 #include <linux/ide.h>
65 #include <linux/completion.h>
66 #include <linux/reboot.h>
67 #include <linux/cdrom.h>
68 #include <linux/seq_file.h>
69 #include <linux/device.h>
70 #include <linux/bitops.h>
72 #include <asm/byteorder.h>
74 #include <asm/uaccess.h>
78 /* default maximum number of failures */
79 #define IDE_DEFAULT_MAX_FAILURES 1
81 struct class *ide_port_class;
83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
84 IDE2_MAJOR, IDE3_MAJOR,
85 IDE4_MAJOR, IDE5_MAJOR,
86 IDE6_MAJOR, IDE7_MAJOR,
87 IDE8_MAJOR, IDE9_MAJOR };
89 static int idebus_parameter; /* holds the "idebus=" parameter */
90 static int system_bus_speed; /* holds what we think is VESA/PCI bus speed */
92 DEFINE_MUTEX(ide_cfg_mtx);
93 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
97 #ifdef CONFIG_BLK_DEV_IDEACPI
99 int ide_noacpitfs = 1;
100 int ide_noacpionboot = 1;
103 ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
105 static void ide_port_init_devices_data(ide_hwif_t *);
108 * Do not even *think* about calling this!
110 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
112 /* bulk initialize hwif & drive info with zeros */
113 memset(hwif, 0, sizeof(ide_hwif_t));
115 /* fill in any non-zero initial values */
117 hwif->major = ide_hwif_to_major[index];
122 hwif->name[3] = '0' + index;
124 hwif->bus_state = BUSSTATE_ON;
126 init_completion(&hwif->gendev_rel_comp);
128 default_hwif_iops(hwif);
129 default_hwif_transport(hwif);
131 ide_port_init_devices_data(hwif);
133 EXPORT_SYMBOL_GPL(ide_init_port_data);
135 static void ide_port_init_devices_data(ide_hwif_t *hwif)
139 for (unit = 0; unit < MAX_DRIVES; ++unit) {
140 ide_drive_t *drive = &hwif->drives[unit];
141 u8 j = (hwif->index * MAX_DRIVES) + unit;
143 memset(drive, 0, sizeof(*drive));
145 drive->media = ide_disk;
146 drive->select.all = (unit<<4)|0xa0;
149 drive->ready_stat = READY_STAT;
150 drive->bad_wstat = BAD_W_STAT;
151 drive->special.b.recalibrate = 1;
152 drive->special.b.set_geometry = 1;
153 drive->name[0] = 'h';
154 drive->name[1] = 'd';
155 drive->name[2] = 'a' + j;
156 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
158 INIT_LIST_HEAD(&drive->list);
159 init_completion(&drive->gendev_rel_comp);
164 * init_ide_data() sets reasonable default values into all fields
165 * of all instances of the hwifs and drives, but only on the first call.
166 * Subsequent calls have no effect (they don't wipe out anything).
168 * This routine is normally called at driver initialization time,
169 * but may also be called MUCH earlier during kernel "command-line"
170 * parameter processing. As such, we cannot depend on any other parts
171 * of the kernel (such as memory allocation) to be functioning yet.
173 * This is too bad, as otherwise we could dynamically allocate the
174 * ide_drive_t structs as needed, rather than always consuming memory
175 * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
177 * FIXME: We should stuff the setup data into __init and copy the
178 * relevant hwifs/allocate them properly during boot.
180 #define MAGIC_COOKIE 0x12345678
181 static void __init init_ide_data (void)
184 static unsigned long magic_cookie = MAGIC_COOKIE;
186 if (magic_cookie != MAGIC_COOKIE)
187 return; /* already initialized */
190 /* Initialise all interface structures */
191 for (index = 0; index < MAX_HWIFS; ++index) {
192 ide_hwif_t *hwif = &ide_hwifs[index];
194 ide_init_port_data(hwif, index);
199 * ide_system_bus_speed - guess bus speed
201 * ide_system_bus_speed() returns what we think is the system VESA/PCI
202 * bus speed (in MHz). This is used for calculating interface PIO timings.
203 * The default is 40 for known PCI systems, 50 otherwise.
204 * The "idebus=xx" parameter can be used to override this value.
205 * The actual value to be used is computed/displayed the first time
206 * through. Drivers should only use this as a last resort.
208 * Returns a guessed speed in MHz.
211 static int ide_system_bus_speed(void)
214 static struct pci_device_id pci_default[] = {
215 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
219 #define pci_default 0
220 #endif /* CONFIG_PCI */
222 /* user supplied value */
223 if (idebus_parameter)
224 return idebus_parameter;
226 /* safe default value for PCI or VESA and PCI*/
227 return pci_dev_present(pci_default) ? 33 : 50;
230 static struct resource* hwif_request_region(ide_hwif_t *hwif,
231 unsigned long addr, int num)
233 struct resource *res = request_region(addr, num, hwif->name);
236 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
237 hwif->name, addr, addr+num-1);
242 * ide_hwif_request_regions - request resources for IDE
243 * @hwif: interface to use
245 * Requests all the needed resources for an interface.
246 * Right now core IDE code does this work which is deeply wrong.
247 * MMIO leaves it to the controller driver,
248 * PIO will migrate this way over time.
251 int ide_hwif_request_regions(ide_hwif_t *hwif)
258 addr = hwif->io_ports[IDE_CONTROL_OFFSET];
259 if (addr && !hwif_request_region(hwif, addr, 1))
260 goto control_region_busy;
262 addr = hwif->io_ports[IDE_DATA_OFFSET];
263 if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
264 if (!hwif_request_region(hwif, addr, 8))
265 goto data_region_busy;
269 for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
270 addr = hwif->io_ports[i];
271 if (!hwif_request_region(hwif, addr, 1)) {
273 release_region(addr, 1);
274 goto data_region_busy;
280 addr = hwif->io_ports[IDE_CONTROL_OFFSET];
282 release_region(addr, 1);
284 /* If any errors are return, we drop the hwif interface. */
289 * ide_hwif_release_regions - free IDE resources
291 * Note that we only release the standard ports,
292 * and do not even try to handle any extra ports
293 * allocated for weird IDE interface chipsets.
295 * Note also that we don't yet handle mmio resources here. More
296 * importantly our caller should be doing this so we need to
297 * restructure this as a helper function for drivers.
300 void ide_hwif_release_regions(ide_hwif_t *hwif)
306 if (hwif->io_ports[IDE_CONTROL_OFFSET])
307 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
308 if (hwif->straight8) {
309 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
312 for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
313 if (hwif->io_ports[i])
314 release_region(hwif->io_ports[i], 1);
317 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
319 ide_hwgroup_t *hwgroup = hwif->hwgroup;
321 spin_lock_irq(&ide_lock);
323 * Remove us from the hwgroup, and free
324 * the hwgroup if we were the only member
326 if (hwif->next == hwif) {
327 BUG_ON(hwgroup->hwif != hwif);
330 /* There is another interface in hwgroup.
331 * Unlink us, and set hwgroup->drive and ->hwif to
334 ide_hwif_t *g = hwgroup->hwif;
336 while (g->next != hwif)
338 g->next = hwif->next;
339 if (hwgroup->hwif == hwif) {
340 /* Chose a random hwif for hwgroup->hwif.
341 * It's guaranteed that there are no drives
342 * left in the hwgroup.
344 BUG_ON(hwgroup->drive != NULL);
347 BUG_ON(hwgroup->hwif == hwif);
349 spin_unlock_irq(&ide_lock);
352 /* Called with ide_lock held. */
353 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
357 for (i = 0; i < MAX_DRIVES; i++) {
358 ide_drive_t *drive = &hwif->drives[i];
360 if (drive->present) {
361 spin_unlock_irq(&ide_lock);
362 device_unregister(&drive->gendev);
363 wait_for_completion(&drive->gendev_rel_comp);
364 spin_lock_irq(&ide_lock);
369 void ide_port_unregister_devices(ide_hwif_t *hwif)
371 mutex_lock(&ide_cfg_mtx);
372 spin_lock_irq(&ide_lock);
373 __ide_port_unregister_devices(hwif);
375 ide_port_init_devices_data(hwif);
376 spin_unlock_irq(&ide_lock);
377 mutex_unlock(&ide_cfg_mtx);
379 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
382 * ide_unregister - free an IDE interface
383 * @index: index of interface (will change soon to a pointer)
385 * Perform the final unregister of an IDE interface. At the moment
386 * we don't refcount interfaces so this will also get split up.
389 * The caller must not hold the IDE locks
390 * The drive present/vanishing is not yet properly locked
391 * Take care with the callbacks. These have been split to avoid
392 * deadlocking the IDE layer. The shutdown callback is called
393 * before we take the lock and free resources. It is up to the
394 * caller to be sure there is no pending I/O here, and that
395 * the interface will not be reopened (present/vanishing locking
396 * isn't yet done BTW). After we commit to the final kill we
397 * call the cleanup callback with the ide locks held.
399 * Unregister restores the hwif structures to the default state.
400 * This is raving bonkers.
403 void ide_unregister(unsigned int index)
405 ide_hwif_t *hwif, *g;
406 ide_hwgroup_t *hwgroup;
409 BUG_ON(index >= MAX_HWIFS);
411 BUG_ON(in_interrupt());
412 BUG_ON(irqs_disabled());
413 mutex_lock(&ide_cfg_mtx);
414 spin_lock_irq(&ide_lock);
415 hwif = &ide_hwifs[index];
418 __ide_port_unregister_devices(hwif);
421 spin_unlock_irq(&ide_lock);
423 ide_proc_unregister_port(hwif);
425 hwgroup = hwif->hwgroup;
427 * free the irq if we were the only hwif using it
431 if (g->irq == hwif->irq)
434 } while (g != hwgroup->hwif);
436 free_irq(hwif->irq, hwgroup);
438 ide_remove_port_from_hwgroup(hwif);
440 device_unregister(hwif->portdev);
441 device_unregister(&hwif->gendev);
442 wait_for_completion(&hwif->gendev_rel_comp);
445 * Remove us from the kernel's knowledge
447 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
448 kfree(hwif->sg_table);
449 unregister_blkdev(hwif->major, hwif->name);
450 spin_lock_irq(&ide_lock);
453 (void)ide_release_dma(hwif);
455 ide_hwif_release_regions(hwif);
457 /* restore hwif data to pristine status */
458 ide_init_port_data(hwif, index);
461 spin_unlock_irq(&ide_lock);
462 mutex_unlock(&ide_cfg_mtx);
465 EXPORT_SYMBOL(ide_unregister);
467 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
469 memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
472 hwif->chipset = hw->chipset;
473 hwif->gendev.parent = hw->dev;
474 hwif->ack_intr = hw->ack_intr;
476 EXPORT_SYMBOL_GPL(ide_init_port_hw);
479 * Locks for IDE setting functionality
482 DEFINE_MUTEX(ide_setting_mtx);
484 EXPORT_SYMBOL_GPL(ide_setting_mtx);
487 * ide_spin_wait_hwgroup - wait for group
488 * @drive: drive in the group
490 * Wait for an IDE device group to go non busy and then return
491 * holding the ide_lock which guards the hwgroup->busy status
492 * and right to use it.
495 int ide_spin_wait_hwgroup (ide_drive_t *drive)
497 ide_hwgroup_t *hwgroup = HWGROUP(drive);
498 unsigned long timeout = jiffies + (3 * HZ);
500 spin_lock_irq(&ide_lock);
502 while (hwgroup->busy) {
503 unsigned long lflags;
504 spin_unlock_irq(&ide_lock);
505 local_irq_set(lflags);
506 if (time_after(jiffies, timeout)) {
507 local_irq_restore(lflags);
508 printk(KERN_ERR "%s: channel busy\n", drive->name);
511 local_irq_restore(lflags);
512 spin_lock_irq(&ide_lock);
517 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
519 int set_io_32bit(ide_drive_t *drive, int arg)
521 if (drive->no_io_32bit)
524 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
527 if (ide_spin_wait_hwgroup(drive))
530 drive->io_32bit = arg;
532 spin_unlock_irq(&ide_lock);
537 static int set_ksettings(ide_drive_t *drive, int arg)
539 if (arg < 0 || arg > 1)
542 if (ide_spin_wait_hwgroup(drive))
544 drive->keep_settings = arg;
545 spin_unlock_irq(&ide_lock);
550 int set_using_dma(ide_drive_t *drive, int arg)
552 #ifdef CONFIG_BLK_DEV_IDEDMA
553 ide_hwif_t *hwif = drive->hwif;
556 if (arg < 0 || arg > 1)
559 if (!drive->id || !(drive->id->capability & 1))
562 if (hwif->dma_host_set == NULL)
566 if (ide_spin_wait_hwgroup(drive))
569 * set ->busy flag, unlock and let it ride
571 hwif->hwgroup->busy = 1;
572 spin_unlock_irq(&ide_lock);
577 if (ide_set_dma(drive))
583 * lock, clear ->busy flag and unlock before leaving
585 spin_lock_irq(&ide_lock);
586 hwif->hwgroup->busy = 0;
587 spin_unlock_irq(&ide_lock);
591 if (arg < 0 || arg > 1)
598 int set_pio_mode(ide_drive_t *drive, int arg)
602 if (arg < 0 || arg > 255)
605 if (drive->hwif->set_pio_mode == NULL)
608 if (drive->special.b.set_tune)
611 ide_init_drive_cmd(&rq);
612 rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
614 drive->tune_req = (u8) arg;
615 drive->special.b.set_tune = 1;
616 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
620 static int set_unmaskirq(ide_drive_t *drive, int arg)
622 if (drive->no_unmask)
625 if (arg < 0 || arg > 1)
628 if (ide_spin_wait_hwgroup(drive))
631 spin_unlock_irq(&ide_lock);
637 * system_bus_clock - clock guess
639 * External version of the bus clock guess used by very old IDE drivers
640 * for things like VLB timings. Should not be used.
643 int system_bus_clock (void)
645 return system_bus_speed;
648 EXPORT_SYMBOL(system_bus_clock);
650 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
652 ide_drive_t *drive = dev->driver_data;
653 ide_hwif_t *hwif = HWIF(drive);
655 struct request_pm_state rqpm;
659 /* Call ACPI _GTM only once */
660 if (!(drive->dn % 2))
661 ide_acpi_get_timing(hwif);
663 memset(&rq, 0, sizeof(rq));
664 memset(&rqpm, 0, sizeof(rqpm));
665 memset(&args, 0, sizeof(args));
666 rq.cmd_type = REQ_TYPE_PM_SUSPEND;
669 rqpm.pm_step = ide_pm_state_start_suspend;
670 if (mesg.event == PM_EVENT_PRETHAW)
671 mesg.event = PM_EVENT_FREEZE;
672 rqpm.pm_state = mesg.event;
674 ret = ide_do_drive_cmd(drive, &rq, ide_wait);
675 /* only call ACPI _PS3 after both drivers are suspended */
676 if (!ret && (((drive->dn % 2) && hwif->drives[0].present
677 && hwif->drives[1].present)
678 || !hwif->drives[0].present
679 || !hwif->drives[1].present))
680 ide_acpi_set_state(hwif, 0);
684 static int generic_ide_resume(struct device *dev)
686 ide_drive_t *drive = dev->driver_data;
687 ide_hwif_t *hwif = HWIF(drive);
689 struct request_pm_state rqpm;
693 /* Call ACPI _STM only once */
694 if (!(drive->dn % 2)) {
695 ide_acpi_set_state(hwif, 1);
696 ide_acpi_push_timing(hwif);
699 ide_acpi_exec_tfs(drive);
701 memset(&rq, 0, sizeof(rq));
702 memset(&rqpm, 0, sizeof(rqpm));
703 memset(&args, 0, sizeof(args));
704 rq.cmd_type = REQ_TYPE_PM_RESUME;
707 rqpm.pm_step = ide_pm_state_start_resume;
708 rqpm.pm_state = PM_EVENT_ON;
710 err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
712 if (err == 0 && dev->driver) {
713 ide_driver_t *drv = to_ide_driver(dev->driver);
722 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
723 unsigned int cmd, unsigned long arg)
727 void __user *p = (void __user *)arg;
728 int err = 0, (*setfunc)(ide_drive_t *, int);
732 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val;
733 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
734 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val;
735 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val;
736 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val;
737 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val;
738 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val;
739 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val;
740 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val;
744 case HDIO_OBSOLETE_IDENTITY:
745 case HDIO_GET_IDENTITY:
746 if (bdev != bdev->bd_contains)
748 if (drive->id_read == 0)
750 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
755 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP |
756 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP |
757 drive->nice1 << IDE_NICE_1,
758 (long __user *) arg);
759 #ifdef CONFIG_IDE_TASK_IOCTL
760 case HDIO_DRIVE_TASKFILE:
761 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
763 switch(drive->media) {
765 return ide_taskfile_ioctl(drive, cmd, arg);
769 #endif /* CONFIG_IDE_TASK_IOCTL */
772 if (!capable(CAP_SYS_RAWIO))
774 return ide_cmd_ioctl(drive, cmd, arg);
776 case HDIO_DRIVE_TASK:
777 if (!capable(CAP_SYS_RAWIO))
779 return ide_task_ioctl(drive, cmd, arg);
781 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
782 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
784 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
785 drv = *(ide_driver_t **)bdev->bd_disk->private_data;
786 if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
787 drive->dsc_overlap = 0;
790 drive->nice1 = (arg >> IDE_NICE_1) & 1;
792 case HDIO_DRIVE_RESET:
793 if (!capable(CAP_SYS_ADMIN))
797 * Abort the current command on the
798 * group if there is one, taking
799 * care not to allow anything else
800 * to be queued and to die on the
801 * spot if we miss one somehow
804 spin_lock_irqsave(&ide_lock, flags);
806 if (HWGROUP(drive)->resetting) {
807 spin_unlock_irqrestore(&ide_lock, flags);
811 ide_abort(drive, "drive reset");
813 BUG_ON(HWGROUP(drive)->handler);
815 /* Ensure nothing gets queued after we
816 drop the lock. Reset will clear the busy */
818 HWGROUP(drive)->busy = 1;
819 spin_unlock_irqrestore(&ide_lock, flags);
820 (void) ide_do_reset(drive);
823 case HDIO_GET_BUSSTATE:
824 if (!capable(CAP_SYS_ADMIN))
826 if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
830 case HDIO_SET_BUSSTATE:
831 if (!capable(CAP_SYS_ADMIN))
839 mutex_lock(&ide_setting_mtx);
840 spin_lock_irqsave(&ide_lock, flags);
842 spin_unlock_irqrestore(&ide_lock, flags);
843 mutex_unlock(&ide_setting_mtx);
844 return err >= 0 ? put_user(err, (long __user *)arg) : err;
847 if (bdev != bdev->bd_contains)
850 if (!capable(CAP_SYS_ADMIN))
853 mutex_lock(&ide_setting_mtx);
854 err = setfunc(drive, arg);
855 mutex_unlock(&ide_setting_mtx);
861 EXPORT_SYMBOL(generic_ide_ioctl);
864 * stridx() returns the offset of c within s,
865 * or -1 if c is '\0' or not found within s.
867 static int __init stridx (const char *s, char c)
869 char *i = strchr(s, c);
870 return (i && c) ? i - s : -1;
874 * match_parm() does parsing for ide_setup():
876 * 1. the first char of s must be '='.
877 * 2. if the remainder matches one of the supplied keywords,
878 * the index (1 based) of the keyword is negated and returned.
879 * 3. if the remainder is a series of no more than max_vals numbers
880 * separated by commas, the numbers are saved in vals[] and a
881 * count of how many were saved is returned. Base10 is assumed,
882 * and base16 is allowed when prefixed with "0x".
883 * 4. otherwise, zero is returned.
885 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
887 static const char *decimal = "0123456789";
888 static const char *hex = "0123456789abcdef";
893 * Try matching against the supplied keywords,
894 * and return -(index+1) if we match one
896 if (keywords != NULL) {
897 for (i = 0; *keywords != NULL; ++i) {
898 if (!strcmp(s, *keywords++))
903 * Look for a series of no more than "max_vals"
904 * numeric values separated by commas, in base10,
905 * or base16 when prefixed with "0x".
906 * Return a count of how many were found.
908 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
910 while ((i = stridx(decimal, *++s)) >= 0)
911 vals[n] = (vals[n] * 10) + i;
912 if (*s == 'x' && !vals[n]) {
913 while ((i = stridx(hex, *++s)) >= 0)
914 vals[n] = (vals[n] * 0x10) + i;
918 if (*s == ',' || *s == ';')
924 return 0; /* zero = nothing matched */
927 extern int probe_ali14xx;
928 extern int probe_umc8672;
929 extern int probe_dtc2278;
930 extern int probe_ht6560b;
931 extern int probe_qd65xx;
932 extern int cmd640_vlb;
933 extern int probe_4drives;
935 static int __initdata is_chipset_set;
938 * ide_setup() gets called VERY EARLY during initialization,
939 * to handle kernel "command line" strings beginning with "hdx=" or "ide".
941 * Remember to update Documentation/ide/ide.txt if you change something here.
943 static int __init ide_setup(char *s)
948 unsigned int hw, unit;
949 const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
950 const char max_hwif = '0' + (MAX_HWIFS - 1);
953 if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */
954 return 0; /* driver and not us */
956 if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
959 printk(KERN_INFO "ide_setup: %s", s);
962 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
963 if (!strcmp(s, "ide=doubler")) {
964 extern int ide_doubler;
966 printk(" : Enabled support for IDE doublers\n");
970 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
972 if (!strcmp(s, "ide=nodma")) {
973 printk(" : Prevented DMA\n");
975 goto obsolete_option;
978 #ifdef CONFIG_BLK_DEV_IDEACPI
979 if (!strcmp(s, "ide=noacpi")) {
980 //printk(" : Disable IDE ACPI support.\n");
984 if (!strcmp(s, "ide=acpigtf")) {
985 //printk(" : Enable IDE ACPI _GTF support.\n");
989 if (!strcmp(s, "ide=acpionboot")) {
990 //printk(" : Call IDE ACPI methods on boot.\n");
991 ide_noacpionboot = 0;
994 #endif /* CONFIG_BLK_DEV_IDEACPI */
997 * Look for drive options: "hdx="
999 if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1000 const char *hd_words[] = {
1001 "none", "noprobe", "nowerr", "cdrom", "nodma",
1002 "autotune", "noautotune", "-8", "-9", "-10",
1003 "noflush", "remap", "remap63", "scsi", NULL };
1005 hw = unit / MAX_DRIVES;
1006 unit = unit % MAX_DRIVES;
1007 hwif = &ide_hwifs[hw];
1008 drive = &hwif->drives[unit];
1009 if (strncmp(s + 4, "ide-", 4) == 0) {
1010 strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1011 goto obsolete_option;
1013 switch (match_parm(&s[3], hd_words, vals, 3)) {
1014 case -1: /* "none" */
1015 case -2: /* "noprobe" */
1018 case -3: /* "nowerr" */
1019 drive->bad_wstat = BAD_R_STAT;
1022 case -4: /* "cdrom" */
1024 drive->media = ide_cdrom;
1025 /* an ATAPI device ignores DRDY */
1026 drive->ready_stat = 0;
1029 case -5: /* nodma */
1032 case -6: /* "autotune" */
1033 drive->autotune = IDE_TUNE_AUTO;
1034 goto obsolete_option;
1035 case -7: /* "noautotune" */
1036 drive->autotune = IDE_TUNE_NOAUTO;
1037 goto obsolete_option;
1038 case -11: /* noflush */
1041 case -12: /* "remap" */
1042 drive->remap_0_to_1 = 1;
1043 goto obsolete_option;
1044 case -13: /* "remap63" */
1046 goto obsolete_option;
1047 case -14: /* "scsi" */
1049 goto obsolete_option;
1050 case 3: /* cyl,head,sect */
1051 drive->media = ide_disk;
1052 drive->ready_stat = READY_STAT;
1053 drive->cyl = drive->bios_cyl = vals[0];
1054 drive->head = drive->bios_head = vals[1];
1055 drive->sect = drive->bios_sect = vals[2];
1057 drive->forced_geom = 1;
1065 if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1068 * Look for bus speed option: "idebus="
1070 if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1071 if (match_parm(&s[6], NULL, vals, 1) != 1)
1073 if (vals[0] >= 20 && vals[0] <= 66) {
1074 idebus_parameter = vals[0];
1076 printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1080 * Look for interface options: "idex="
1082 if (s[3] >= '0' && s[3] <= max_hwif) {
1084 * Be VERY CAREFUL changing this: note hardcoded indexes below
1085 * (-8, -9, -10) are reserved to ease the hardcoding.
1087 static const char *ide_words[] = {
1088 "minus1", "serialize", "minus3", "minus4",
1089 "reset", "minus6", "ata66", "minus8", "minus9",
1090 "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1091 "dtc2278", "umc8672", "ali14xx", NULL };
1094 hwif = &ide_hwifs[hw];
1095 i = match_parm(&s[4], ide_words, vals, 3);
1098 * Cryptic check to ensure chipset not already set for hwif.
1099 * Note: we can't depend on hwif->chipset here.
1101 if (i >= -18 && i <= -11) {
1102 /* chipset already specified */
1105 /* these drivers are for "ide0=" only */
1113 #ifdef CONFIG_BLK_DEV_ALI14XX
1114 case -17: /* "ali14xx" */
1116 goto obsolete_option;
1118 #ifdef CONFIG_BLK_DEV_UMC8672
1119 case -16: /* "umc8672" */
1121 goto obsolete_option;
1123 #ifdef CONFIG_BLK_DEV_DTC2278
1124 case -15: /* "dtc2278" */
1126 goto obsolete_option;
1128 #ifdef CONFIG_BLK_DEV_CMD640
1129 case -14: /* "cmd640_vlb" */
1131 goto obsolete_option;
1133 #ifdef CONFIG_BLK_DEV_HT6560B
1134 case -13: /* "ht6560b" */
1136 goto obsolete_option;
1138 #ifdef CONFIG_BLK_DEV_QD65XX
1139 case -12: /* "qd65xx" */
1141 goto obsolete_option;
1143 #ifdef CONFIG_BLK_DEV_4DRIVES
1144 case -11: /* "four" drives on one set of ports */
1146 goto obsolete_option;
1148 case -10: /* minus10 */
1149 case -9: /* minus9 */
1150 case -8: /* minus8 */
1155 case -7: /* ata66 */
1156 #ifdef CONFIG_BLK_DEV_IDEPCI
1158 * Use ATA_CBL_PATA40_SHORT so drive side
1159 * cable detection is also overriden.
1161 hwif->cbl = ATA_CBL_PATA40_SHORT;
1162 goto obsolete_option;
1166 case -5: /* "reset" */
1168 goto obsolete_option;
1169 case -2: /* "serialize" */
1170 hwif->mate = &ide_hwifs[hw^1];
1171 hwif->mate->mate = hwif;
1172 hwif->serialized = hwif->mate->serialized = 1;
1173 goto obsolete_option;
1182 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1187 printk(" -- BAD OPTION\n");
1190 printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1193 printk("-- NOT SUPPORTED ON ide%d", hw);
1199 EXPORT_SYMBOL(ide_lock);
1201 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1206 static char *media_string(ide_drive_t *drive)
1208 switch (drive->media) {
1224 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1226 ide_drive_t *drive = to_ide_device(dev);
1227 return sprintf(buf, "%s\n", media_string(drive));
1230 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1232 ide_drive_t *drive = to_ide_device(dev);
1233 return sprintf(buf, "%s\n", drive->name);
1236 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1238 ide_drive_t *drive = to_ide_device(dev);
1239 return sprintf(buf, "ide:m-%s\n", media_string(drive));
1242 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1245 ide_drive_t *drive = to_ide_device(dev);
1246 return sprintf(buf, "%s\n", drive->id->model);
1249 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1252 ide_drive_t *drive = to_ide_device(dev);
1253 return sprintf(buf, "%s\n", drive->id->fw_rev);
1256 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1259 ide_drive_t *drive = to_ide_device(dev);
1260 return sprintf(buf, "%s\n", drive->id->serial_no);
1263 static struct device_attribute ide_dev_attrs[] = {
1265 __ATTR_RO(drivename),
1266 __ATTR_RO(modalias),
1268 __ATTR_RO(firmware),
1269 __ATTR(serial, 0400, serial_show, NULL),
1273 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1275 ide_drive_t *drive = to_ide_device(dev);
1277 add_uevent_var(env, "MEDIA=%s", media_string(drive));
1278 add_uevent_var(env, "DRIVENAME=%s", drive->name);
1279 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1283 static int generic_ide_probe(struct device *dev)
1285 ide_drive_t *drive = to_ide_device(dev);
1286 ide_driver_t *drv = to_ide_driver(dev->driver);
1288 return drv->probe ? drv->probe(drive) : -ENODEV;
1291 static int generic_ide_remove(struct device *dev)
1293 ide_drive_t *drive = to_ide_device(dev);
1294 ide_driver_t *drv = to_ide_driver(dev->driver);
1302 static void generic_ide_shutdown(struct device *dev)
1304 ide_drive_t *drive = to_ide_device(dev);
1305 ide_driver_t *drv = to_ide_driver(dev->driver);
1307 if (dev->driver && drv->shutdown)
1308 drv->shutdown(drive);
1311 struct bus_type ide_bus_type = {
1313 .match = ide_bus_match,
1314 .uevent = ide_uevent,
1315 .probe = generic_ide_probe,
1316 .remove = generic_ide_remove,
1317 .shutdown = generic_ide_shutdown,
1318 .dev_attrs = ide_dev_attrs,
1319 .suspend = generic_ide_suspend,
1320 .resume = generic_ide_resume,
1323 EXPORT_SYMBOL_GPL(ide_bus_type);
1325 static void ide_port_class_release(struct device *portdev)
1327 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1329 put_device(&hwif->gendev);
1333 * This is gets invoked once during initialization, to set *everything* up
1335 static int __init ide_init(void)
1339 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1340 system_bus_speed = ide_system_bus_speed();
1342 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1343 "for PIO modes%s\n", system_bus_speed,
1344 idebus_parameter ? "" : "; override with idebus=xx");
1346 ret = bus_register(&ide_bus_type);
1348 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1352 ide_port_class = class_create(THIS_MODULE, "ide_port");
1353 if (IS_ERR(ide_port_class)) {
1354 ret = PTR_ERR(ide_port_class);
1355 goto out_port_class;
1357 ide_port_class->dev_release = ide_port_class_release;
1366 bus_unregister(&ide_bus_type);
1372 static char *options = NULL;
1373 module_param(options, charp, 0);
1374 MODULE_LICENSE("GPL");
1376 static void __init parse_options (char *line)
1380 if (line == NULL || !*line)
1382 while ((line = next) != NULL) {
1383 if ((next = strchr(line,' ')) != NULL)
1385 if (!ide_setup(line))
1386 printk (KERN_INFO "Unknown option '%s'\n", line);
1390 int __init init_module (void)
1392 parse_options(options);
1396 void __exit cleanup_module (void)
1400 for (index = 0; index < MAX_HWIFS; ++index)
1401 ide_unregister(index);
1405 class_destroy(ide_port_class);
1407 bus_unregister(&ide_bus_type);
1412 __setup("", ide_setup);
1414 module_init(ide_init);