[mirror_ubuntu-artful-kernel.git] / drivers / ide / ide.c

/*
 *  Copyright (C) 1994-1998	    Linus Torvalds & authors (see below)
 *  Copyright (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord  <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
 *   (usually 14 & 15).
 * There can be up to two drives per interface, as per the ATA-2 spec.
 *
 * ...
 *
 *  From hd.c:
 *  |
 *  | It traverses the request-list, using interrupts to jump between functions.
 *  | As nearly all functions can be called within interrupts, we may not sleep.
 *  | Special care is recommended.  Have Fun!
 *  |
 *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
 *  |
 *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
 *  | in the early extended-partition checks and added DM partitions.
 *  |
 *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
 *  |
 *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
 *  | and general streamlining by Mark Lord (mlord@pobox.com).
 *
 *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
 *
 *	Mark Lord	(mlord@pobox.com)		(IDE Perf.Pkg)
 *	Delman Lee	(delman@ieee.org)		("Mr. atdisk2")
 *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
 *
 *  This was a rewrite of just about everything from hd.c, though some original
 *  code is still sprinkled about.  Think of it as a major evolution, with
 *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/completion.h>
#include <linux/device.h>

struct class *ide_port_class;

/**
 * ide_device_get	-	get an additional reference to a ide_drive_t
 * @drive:	device to get a reference to
 *
 * Gets a reference to the ide_drive_t and increments the use count of the
 * underlying LLDD module.
 */
int ide_device_get(ide_drive_t *drive)
{
	struct device *host_dev;
	struct module *module;

	if (!get_device(&drive->gendev))
		return -ENXIO;

	host_dev = drive->hwif->host->dev[0];
	module = host_dev ? host_dev->driver->owner : NULL;

	if (module && !try_module_get(module)) {
		put_device(&drive->gendev);
		return -ENXIO;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ide_device_get);

/**
 * ide_device_put	-	release a reference to a ide_drive_t
 * @drive:	device to release a reference on
 *
 * Release a reference to the ide_drive_t and decrements the use count of
 * the underlying LLDD module.
 */
void ide_device_put(ide_drive_t *drive)
{
#ifdef CONFIG_MODULE_UNLOAD
	struct device *host_dev = drive->hwif->host->dev[0];
	struct module *module = host_dev ? host_dev->driver->owner : NULL;

	module_put(module);
#endif
	put_device(&drive->gendev);
}
EXPORT_SYMBOL_GPL(ide_device_put);

static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
	return 1;
}

static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	ide_drive_t *drive = to_ide_device(dev);

	add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
	add_uevent_var(env, "DRIVENAME=%s", drive->name);
	add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
	return 0;
}

static int generic_ide_probe(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	return drv->probe ? drv->probe(drive) : -ENODEV;
}

static int generic_ide_remove(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	if (drv->remove)
		drv->remove(drive);

	return 0;
}

static void generic_ide_shutdown(struct device *dev)
{
	ide_drive_t *drive = to_ide_device(dev);
	struct ide_driver *drv = to_ide_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(drive);
}

struct bus_type ide_bus_type = {
	.name		= "ide",
	.match		= ide_bus_match,
	.uevent		= ide_uevent,
	.probe		= generic_ide_probe,
	.remove		= generic_ide_remove,
	.shutdown	= generic_ide_shutdown,
	.dev_groups	= ide_dev_groups,
	.suspend	= generic_ide_suspend,
	.resume		= generic_ide_resume,
};

EXPORT_SYMBOL_GPL(ide_bus_type);

int ide_vlb_clk;
EXPORT_SYMBOL_GPL(ide_vlb_clk);

module_param_named(vlb_clock, ide_vlb_clk, int, 0);
MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");

int ide_pci_clk;
EXPORT_SYMBOL_GPL(ide_pci_clk);

module_param_named(pci_clock, ide_pci_clk, int, 0);
MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");

static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp)
{
	unsigned int a, b, i, j = 1;
	unsigned int *dev_param_mask = (unsigned int *)kp->arg;

	/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
	if (sscanf(s, "%u.%u:%u", &a, &b, &j) != 3 &&
	    sscanf(s, "%u.%u", &a, &b) != 2)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j > 1)
		return -EINVAL;

	if (j)
		*dev_param_mask |= (1 << i);
	else
		*dev_param_mask &= ~(1 << i);

	return 0;
}

static const struct kernel_param_ops param_ops_ide_dev_mask = {
	.set = ide_set_dev_param_mask
};

#define param_check_ide_dev_mask(name, p) param_check_uint(name, p)

static unsigned int ide_nodma;

module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");

static unsigned int ide_noflush;

module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");

static unsigned int ide_nohpa;

module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");

static unsigned int ide_noprobe;

module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");

static unsigned int ide_nowerr;

module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");

static unsigned int ide_cdroms;

module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");

struct chs_geom {
	unsigned int	cyl;
	u8		head;
	u8		sect;
};

static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];

static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
{
	unsigned int a, b, c = 0, h = 0, s = 0, i, j = 1;

	/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
	/* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
	if (sscanf(str, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 &&
	    sscanf(str, "%u.%u:%u", &a, &b, &j) != 3)
		return -EINVAL;

	i = a * MAX_DRIVES + b;

	if (i >= MAX_HWIFS * MAX_DRIVES || j > 1)
		return -EINVAL;

	if (c > INT_MAX || h > 255 || s > 255)
		return -EINVAL;

	if (j)
		ide_disks |= (1 << i);
	else
		ide_disks &= ~(1 << i);

	ide_disks_chs[i].cyl  = c;
	ide_disks_chs[i].head = h;
	ide_disks_chs[i].sect = s;

	return 0;
}

module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");

static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
{
	int i = drive->hwif->index * MAX_DRIVES + unit;

	if (ide_nodma & (1 << i)) {
		printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_NODMA;
	}
	if (ide_noflush & (1 << i)) {
		printk(KERN_INFO "ide: disabling flush requests for %s\n",
				 drive->name);
		drive->dev_flags |= IDE_DFLAG_NOFLUSH;
	}
	if (ide_nohpa & (1 << i)) {
		printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
				 drive->name);
		drive->dev_flags |= IDE_DFLAG_NOHPA;
	}
	if (ide_noprobe & (1 << i)) {
		printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_NOPROBE;
	}
	if (ide_nowerr & (1 << i)) {
		printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
				 drive->name);
		drive->bad_wstat = BAD_R_STAT;
	}
	if (ide_cdroms & (1 << i)) {
		printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
		drive->dev_flags |= IDE_DFLAG_PRESENT;
		drive->media = ide_cdrom;
		/* an ATAPI device ignores DRDY */
		drive->ready_stat = 0;
	}
	if (ide_disks & (1 << i)) {
		drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
		drive->head = drive->bios_head = ide_disks_chs[i].head;
		drive->sect = drive->bios_sect = ide_disks_chs[i].sect;

		printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
				 drive->name,
				 drive->cyl, drive->head, drive->sect);

		drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
		drive->media = ide_disk;
		drive->ready_stat = ATA_DRDY;
	}
}

static unsigned int ide_ignore_cable;

static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
	int i, j = 1;

	/* controller (ignore) */
	/* controller : 1 (ignore) | 0 (use) */
	if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
		return -EINVAL;

	if (i >= MAX_HWIFS || j < 0 || j > 1)
		return -EINVAL;

	if (j)
		ide_ignore_cable |= (1 << i);
	else
		ide_ignore_cable &= ~(1 << i);

	return 0;
}

module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");

void ide_port_apply_params(ide_hwif_t *hwif)
{
	ide_drive_t *drive;
	int i;

	if (ide_ignore_cable & (1 << hwif->index)) {
		printk(KERN_INFO "ide: ignoring cable detection for %s\n",
				 hwif->name);
		hwif->cbl = ATA_CBL_PATA40_SHORT;
	}

	ide_port_for_each_dev(i, drive, hwif)
		ide_dev_apply_params(drive, i);
}

/*
 * This is gets invoked once during initialization, to set *everything* up
 */
static int __init ide_init(void)
{
	int ret;

	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");

	ret = bus_register(&ide_bus_type);
	if (ret < 0) {
		printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
		return ret;
	}

	ide_port_class = class_create(THIS_MODULE, "ide_port");
	if (IS_ERR(ide_port_class)) {
		ret = PTR_ERR(ide_port_class);
		goto out_port_class;
	}

	ide_acpi_init();

	proc_ide_create();

	return 0;

out_port_class:
	bus_unregister(&ide_bus_type);

	return ret;
}

static void __exit ide_exit(void)
{
	proc_ide_destroy();

	class_destroy(ide_port_class);

	bus_unregister(&ide_bus_type);
}

module_init(ide_init);
module_exit(ide_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
59bca8cc	2	* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
fc410698	3	* Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
1da177e4 LT	4	*/
	5
	6	/*
	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>
	10	*
	11	* See linux/MAINTAINERS for address of current maintainer.
	12	*
	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
	15	* (usually 14 & 15).
	16	* There can be up to two drives per interface, as per the ATA-2 spec.
	17	*
1da177e4 LT	18	* ...
	19	*
	20	* From hd.c:
	21	* \|
	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!
	25	* \|
	26	* \| modified by Drew Eckhardt to check nr of hd's from the CMOS.
	27	* \|
	28	* \| Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
	29	* \| in the early extended-partition checks and added DM partitions.
	30	* \|
	31	* \| Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
	32	* \|
	33	* \| IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
	34	* \| and general streamlining by Mark Lord (mlord@pobox.com).
	35	*
	36	* October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
	37	*
	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)
	41	*
	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
1da177e4 LT	45	*/
1da177e4 LT	46
1da177e4 LT	47	#include <linux/module.h>
	48	#include <linux/types.h>
	49	#include <linux/string.h>
	50	#include <linux/kernel.h>
1da177e4 LT	51	#include <linux/interrupt.h>
	52	#include <linux/major.h>
	53	#include <linux/errno.h>
	54	#include <linux/genhd.h>
1da177e4 LT	55	#include <linux/init.h>
1da177e4 LT	56	#include <linux/pci.h>
1da177e4	57	#include <linux/ide.h>
3ceca727	58	#include <linux/hdreg.h>
1da177e4	59	#include <linux/completion.h>
1da177e4	60	#include <linux/device.h>
1da177e4	61
f74c9141 BZ	62	struct class *ide_port_class;
f74c9141 BZ	63
08da591e BZ	64	/**
	65	* ide_device_get - get an additional reference to a ide_drive_t
	66	* @drive: device to get a reference to
	67	*
	68	* Gets a reference to the ide_drive_t and increments the use count of the
	69	* underlying LLDD module.
	70	*/
	71	int ide_device_get(ide_drive_t *drive)
	72	{
	73	struct device *host_dev;
	74	struct module *module;
	75
	76	if (!get_device(&drive->gendev))
	77	return -ENXIO;
	78
	79	host_dev = drive->hwif->host->dev[0];
	80	module = host_dev ? host_dev->driver->owner : NULL;
	81
	82	if (module && !try_module_get(module)) {
	83	put_device(&drive->gendev);
	84	return -ENXIO;
	85	}
	86
	87	return 0;
	88	}
	89	EXPORT_SYMBOL_GPL(ide_device_get);
	90
	91	/**
	92	* ide_device_put - release a reference to a ide_drive_t
	93	* @drive: device to release a reference on
	94	*
	95	* Release a reference to the ide_drive_t and decrements the use count of
	96	* the underlying LLDD module.
	97	*/
	98	void ide_device_put(ide_drive_t *drive)
	99	{
	100	#ifdef CONFIG_MODULE_UNLOAD
	101	struct device *host_dev = drive->hwif->host->dev[0];
	102	struct module *module = host_dev ? host_dev->driver->owner : NULL;
	103
1746fbe5	104	module_put(module);
08da591e BZ	105	#endif
	106	put_device(&drive->gendev);
	107	}
	108	EXPORT_SYMBOL_GPL(ide_device_put);
	109
8604affd BZ	110	static int ide_bus_match(struct device dev, struct device_driver drv)
	111	{
	112	return 1;
	113	}
	114
7eff2e7a	115	static int ide_uevent(struct device dev, struct kobj_uevent_env env)
263756ec KS	116	{
263756ec KS	117	ide_drive_t *drive = to_ide_device(dev);
7eff2e7a	118
ebdab07d	119	add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
7eff2e7a	120	add_uevent_var(env, "DRIVENAME=%s", drive->name);
ebdab07d	121	add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
263756ec KS	122	return 0;
	123	}
	124
4031bbe4 RK	125	static int generic_ide_probe(struct device *dev)
	126	{
	127	ide_drive_t *drive = to_ide_device(dev);
7f3c868b	128	struct ide_driver *drv = to_ide_driver(dev->driver);
4031bbe4 RK	129
	130	return drv->probe ? drv->probe(drive) : -ENODEV;
	131	}
	132
	133	static int generic_ide_remove(struct device *dev)
	134	{
	135	ide_drive_t *drive = to_ide_device(dev);
7f3c868b	136	struct ide_driver *drv = to_ide_driver(dev->driver);
4031bbe4 RK	137
	138	if (drv->remove)
	139	drv->remove(drive);
	140
	141	return 0;
	142	}
	143
	144	static void generic_ide_shutdown(struct device *dev)
	145	{
	146	ide_drive_t *drive = to_ide_device(dev);
7f3c868b	147	struct ide_driver *drv = to_ide_driver(dev->driver);
4031bbe4 RK	148
	149	if (dev->driver && drv->shutdown)
	150	drv->shutdown(drive);
	151	}
	152
1da177e4 LT	153	struct bus_type ide_bus_type = {
1da177e4 LT	154	.name = "ide",
8604affd	155	.match = ide_bus_match,
263756ec	156	.uevent = ide_uevent,
4031bbe4 RK	157	.probe = generic_ide_probe,
	158	.remove = generic_ide_remove,
	159	.shutdown = generic_ide_shutdown,
fb3fed79	160	.dev_groups = ide_dev_groups,
1da177e4 LT	161	.suspend = generic_ide_suspend,
	162	.resume = generic_ide_resume,
	163	};
	164
8604affd BZ	165	EXPORT_SYMBOL_GPL(ide_bus_type);
8604affd BZ	166
ebae41a5 BZ	167	int ide_vlb_clk;
	168	EXPORT_SYMBOL_GPL(ide_vlb_clk);
	169
	170	module_param_named(vlb_clock, ide_vlb_clk, int, 0);
	171	MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
	172
	173	int ide_pci_clk;
	174	EXPORT_SYMBOL_GPL(ide_pci_clk);
	175
	176	module_param_named(pci_clock, ide_pci_clk, int, 0);
	177	MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
	178
1a8bff5b	179	static int ide_set_dev_param_mask(const char s, const struct kernel_param kp)
6e87543a	180	{
0860bf94	181	unsigned int a, b, i, j = 1;
6e87543a BZ	182	unsigned int dev_param_mask = (unsigned int )kp->arg;
6e87543a BZ	183
0af80c04	184	/* controller . device (0 or 1) [ : 1 (set) \| 0 (clear) ] */
0860bf94 DC	185	if (sscanf(s, "%u.%u:%u", &a, &b, &j) != 3 &&
0860bf94 DC	186	sscanf(s, "%u.%u", &a, &b) != 2)
6e87543a BZ	187	return -EINVAL;
	188
	189	i = a * MAX_DRIVES + b;
	190
0860bf94	191	if (i >= MAX_HWIFS * MAX_DRIVES \|\| j > 1)
6e87543a BZ	192	return -EINVAL;
	193
	194	if (j)
	195	*dev_param_mask \|= (1 << i);
	196	else
0af80c04	197	*dev_param_mask &= ~(1 << i);
6e87543a BZ	198
	199	return 0;
	200	}
	201
9c27847d	202	static const struct kernel_param_ops param_ops_ide_dev_mask = {
1a8bff5b RR	203	.set = ide_set_dev_param_mask
	204	};
	205
	206	#define param_check_ide_dev_mask(name, p) param_check_uint(name, p)
	207
6e87543a BZ	208	static unsigned int ide_nodma;
6e87543a BZ	209
1a8bff5b	210	module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
6e87543a BZ	211	MODULE_PARM_DESC(nodma, "disallow DMA for a device");
	212
	213	static unsigned int ide_noflush;
	214
1a8bff5b	215	module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
6e87543a BZ	216	MODULE_PARM_DESC(noflush, "disable flush requests for a device");
6e87543a BZ	217
075affcb BZ	218	static unsigned int ide_nohpa;
075affcb BZ	219
1a8bff5b	220	module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
075affcb BZ	221	MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
075affcb BZ	222
6e87543a BZ	223	static unsigned int ide_noprobe;
6e87543a BZ	224
1a8bff5b	225	module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
6e87543a BZ	226	MODULE_PARM_DESC(noprobe, "skip probing for a device");
	227
	228	static unsigned int ide_nowerr;
	229
1a8bff5b	230	module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
3a7d2484	231	MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
6e87543a	232
4706a7e0 BZ	233	static unsigned int ide_cdroms;
4706a7e0 BZ	234
1a8bff5b	235	module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
4706a7e0 BZ	236	MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
	237
	238	struct chs_geom {
	239	unsigned int cyl;
	240	u8 head;
	241	u8 sect;
	242	};
	243
	244	static unsigned int ide_disks;
	245	static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
	246
	247	static int ide_set_disk_chs(const char str, struct kernel_param kp)
	248	{
0860bf94	249	unsigned int a, b, c = 0, h = 0, s = 0, i, j = 1;
4706a7e0	250
0af80c04 DF	251	/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
0af80c04 DF	252	/* controller . device (0 or 1) : 1 (use CHS) \| 0 (ignore CHS) */
0860bf94 DC	253	if (sscanf(str, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 &&
0860bf94 DC	254	sscanf(str, "%u.%u:%u", &a, &b, &j) != 3)
4706a7e0 BZ	255	return -EINVAL;
	256
	257	i = a * MAX_DRIVES + b;
	258
0860bf94	259	if (i >= MAX_HWIFS * MAX_DRIVES \|\| j > 1)
4706a7e0 BZ	260	return -EINVAL;
	261
	262	if (c > INT_MAX \|\| h > 255 \|\| s > 255)
	263	return -EINVAL;
	264
	265	if (j)
	266	ide_disks \|= (1 << i);
	267	else
0af80c04	268	ide_disks &= ~(1 << i);
4706a7e0 BZ	269
	270	ide_disks_chs[i].cyl = c;
	271	ide_disks_chs[i].head = h;
	272	ide_disks_chs[i].sect = s;
	273
	274	return 0;
	275	}
	276
	277	module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
	278	MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
	279
123995b9	280	static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
6e87543a	281	{
123995b9	282	int i = drive->hwif->index * MAX_DRIVES + unit;
6e87543a BZ	283
	284	if (ide_nodma & (1 << i)) {
	285	printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
97100fc8	286	drive->dev_flags \|= IDE_DFLAG_NODMA;
6e87543a BZ	287	}
	288	if (ide_noflush & (1 << i)) {
	289	printk(KERN_INFO "ide: disabling flush requests for %s\n",
	290	drive->name);
97100fc8	291	drive->dev_flags \|= IDE_DFLAG_NOFLUSH;
6e87543a	292	}
075affcb BZ	293	if (ide_nohpa & (1 << i)) {
	294	printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
	295	drive->name);
	296	drive->dev_flags \|= IDE_DFLAG_NOHPA;
	297	}
6e87543a BZ	298	if (ide_noprobe & (1 << i)) {
6e87543a BZ	299	printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
97100fc8	300	drive->dev_flags \|= IDE_DFLAG_NOPROBE;
6e87543a BZ	301	}
6e87543a BZ	302	if (ide_nowerr & (1 << i)) {
3a7d2484	303	printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
6e87543a BZ	304	drive->name);
	305	drive->bad_wstat = BAD_R_STAT;
	306	}
4706a7e0 BZ	307	if (ide_cdroms & (1 << i)) {
4706a7e0 BZ	308	printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
97100fc8	309	drive->dev_flags \|= IDE_DFLAG_PRESENT;
4706a7e0 BZ	310	drive->media = ide_cdrom;
	311	/* an ATAPI device ignores DRDY */
	312	drive->ready_stat = 0;
	313	}
	314	if (ide_disks & (1 << i)) {
	315	drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
	316	drive->head = drive->bios_head = ide_disks_chs[i].head;
	317	drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
97100fc8	318
4706a7e0 BZ	319	printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
	320	drive->name,
	321	drive->cyl, drive->head, drive->sect);
97100fc8 BZ	322
97100fc8 BZ	323	drive->dev_flags \|= IDE_DFLAG_FORCED_GEOM \| IDE_DFLAG_PRESENT;
4706a7e0	324	drive->media = ide_disk;
3a7d2484	325	drive->ready_stat = ATA_DRDY;
4706a7e0	326	}
6e87543a BZ	327	}
6e87543a BZ	328
9fd91d95 BZ	329	static unsigned int ide_ignore_cable;
	330
	331	static int ide_set_ignore_cable(const char s, struct kernel_param kp)
	332	{
	333	int i, j = 1;
	334
0af80c04 DF	335	/* controller (ignore) */
0af80c04 DF	336	/* controller : 1 (ignore) \| 0 (use) */
9fd91d95 BZ	337	if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
	338	return -EINVAL;
	339
	340	if (i >= MAX_HWIFS \|\| j < 0 \|\| j > 1)
	341	return -EINVAL;
	342
	343	if (j)
	344	ide_ignore_cable \|= (1 << i);
	345	else
0af80c04	346	ide_ignore_cable &= ~(1 << i);
9fd91d95 BZ	347
	348	return 0;
	349	}
	350
	351	module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
	352	MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
	353
	354	void ide_port_apply_params(ide_hwif_t *hwif)
	355	{
2bd24a1c	356	ide_drive_t *drive;
6e87543a BZ	357	int i;
6e87543a BZ	358
9fd91d95 BZ	359	if (ide_ignore_cable & (1 << hwif->index)) {
	360	printk(KERN_INFO "ide: ignoring cable detection for %s\n",
	361	hwif->name);
	362	hwif->cbl = ATA_CBL_PATA40_SHORT;
	363	}
6e87543a	364
2bd24a1c BZ	365	ide_port_for_each_dev(i, drive, hwif)
2bd24a1c BZ	366	ide_dev_apply_params(drive, i);
9fd91d95 BZ	367	}
9fd91d95 BZ	368
1da177e4 LT	369	/*
	370	* This is gets invoked once during initialization, to set everything up
	371	*/
	372	static int __init ide_init(void)
	373	{
349ae23f RD	374	int ret;
349ae23f RD	375
eba8ff94	376	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
537f06c5	377
349ae23f RD	378	ret = bus_register(&ide_bus_type);
	379	if (ret < 0) {
	380	printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
	381	return ret;
	382	}
1da177e4	383
f74c9141 BZ	384	ide_port_class = class_create(THIS_MODULE, "ide_port");
	385	if (IS_ERR(ide_port_class)) {
	386	ret = PTR_ERR(ide_port_class);
	387	goto out_port_class;
	388	}
f74c9141	389
8b803bd1 BZ	390	ide_acpi_init();
8b803bd1 BZ	391
5cbf79cd	392	proc_ide_create();
1da177e4	393
1da177e4	394	return 0;
f74c9141 BZ	395
	396	out_port_class:
	397	bus_unregister(&ide_bus_type);
	398
	399	return ret;
1da177e4 LT	400	}
1da177e4 LT	401
931ee0dc	402	static void __exit ide_exit(void)
1da177e4	403	{
1da177e4	404	proc_ide_destroy();
1da177e4	405
f74c9141 BZ	406	class_destroy(ide_port_class);
f74c9141 BZ	407
1da177e4 LT	408	bus_unregister(&ide_bus_type);
	409	}
	410
1da177e4	411	module_init(ide_init);
931ee0dc	412	module_exit(ide_exit);
1da177e4	413
931ee0dc	414	MODULE_LICENSE("GPL");