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OpenCloudOS-Kernel/drivers/ide/ide.c

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/*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyrifht (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
*/
#define _IDE_C /* Tell ide.h it's really us */
#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/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/device.h>
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
struct class *ide_port_class;
static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
IDE2_MAJOR, IDE3_MAJOR,
IDE4_MAJOR, IDE5_MAJOR,
IDE6_MAJOR, IDE7_MAJOR,
IDE8_MAJOR, IDE9_MAJOR };
DEFINE_MUTEX(ide_cfg_mtx);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
EXPORT_SYMBOL(ide_lock);
static void ide_port_init_devices_data(ide_hwif_t *);
/*
* Do not even *think* about calling this!
*/
void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
{
/* bulk initialize hwif & drive info with zeros */
memset(hwif, 0, sizeof(ide_hwif_t));
/* fill in any non-zero initial values */
hwif->index = index;
hwif->major = ide_hwif_to_major[index];
hwif->name[0] = 'i';
hwif->name[1] = 'd';
hwif->name[2] = 'e';
hwif->name[3] = '0' + index;
hwif->bus_state = BUSSTATE_ON;
init_completion(&hwif->gendev_rel_comp);
default_hwif_iops(hwif);
default_hwif_transport(hwif);
ide_port_init_devices_data(hwif);
}
static void ide_port_init_devices_data(ide_hwif_t *hwif)
{
int unit;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
u8 j = (hwif->index * MAX_DRIVES) + unit;
memset(drive, 0, sizeof(*drive));
drive->media = ide_disk;
drive->select.all = (unit<<4)|0xa0;
drive->hwif = hwif;
drive->ready_stat = READY_STAT;
drive->bad_wstat = BAD_W_STAT;
drive->special.b.recalibrate = 1;
drive->special.b.set_geometry = 1;
drive->name[0] = 'h';
drive->name[1] = 'd';
drive->name[2] = 'a' + j;
drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
INIT_LIST_HEAD(&drive->list);
init_completion(&drive->gendev_rel_comp);
}
}
void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
{
ide_hwgroup_t *hwgroup = hwif->hwgroup;
spin_lock_irq(&ide_lock);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
if (hwif->next == hwif) {
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
/* There is another interface in hwgroup.
* Unlink us, and set hwgroup->drive and ->hwif to
* something sane.
*/
ide_hwif_t *g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Chose a random hwif for hwgroup->hwif.
* It's guaranteed that there are no drives
* left in the hwgroup.
*/
BUG_ON(hwgroup->drive != NULL);
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
spin_unlock_irq(&ide_lock);
}
/* Called with ide_lock held. */
static void __ide_port_unregister_devices(ide_hwif_t *hwif)
{
int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive = &hwif->drives[i];
if (drive->present) {
spin_unlock_irq(&ide_lock);
device_unregister(&drive->gendev);
wait_for_completion(&drive->gendev_rel_comp);
spin_lock_irq(&ide_lock);
}
}
}
void ide_port_unregister_devices(ide_hwif_t *hwif)
{
mutex_lock(&ide_cfg_mtx);
spin_lock_irq(&ide_lock);
__ide_port_unregister_devices(hwif);
hwif->present = 0;
ide_port_init_devices_data(hwif);
spin_unlock_irq(&ide_lock);
mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
/**
* ide_unregister - free an IDE interface
* @hwif: IDE interface
*
* Perform the final unregister of an IDE interface. At the moment
* we don't refcount interfaces so this will also get split up.
*
* Locking:
* The caller must not hold the IDE locks
* The drive present/vanishing is not yet properly locked
* Take care with the callbacks. These have been split to avoid
* deadlocking the IDE layer. The shutdown callback is called
* before we take the lock and free resources. It is up to the
* caller to be sure there is no pending I/O here, and that
* the interface will not be reopened (present/vanishing locking
* isn't yet done BTW). After we commit to the final kill we
* call the cleanup callback with the ide locks held.
*
* Unregister restores the hwif structures to the default state.
* This is raving bonkers.
*/
void ide_unregister(ide_hwif_t *hwif)
{
ide_hwif_t *g;
ide_hwgroup_t *hwgroup;
int irq_count = 0;
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
mutex_lock(&ide_cfg_mtx);
spin_lock_irq(&ide_lock);
if (hwif->present) {
__ide_port_unregister_devices(hwif);
hwif->present = 0;
}
spin_unlock_irq(&ide_lock);
ide_proc_unregister_port(hwif);
hwgroup = hwif->hwgroup;
/*
* free the irq if we were the only hwif using it
*/
g = hwgroup->hwif;
do {
if (g->irq == hwif->irq)
++irq_count;
g = g->next;
} while (g != hwgroup->hwif);
if (irq_count == 1)
free_irq(hwif->irq, hwgroup);
ide_remove_port_from_hwgroup(hwif);
device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);
/*
* Remove us from the kernel's knowledge
*/
blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
kfree(hwif->sg_table);
unregister_blkdev(hwif->major, hwif->name);
if (hwif->dma_base)
ide_release_dma_engine(hwif);
spin_lock_irq(&ide_lock);
/* restore hwif data to pristine status */
ide_init_port_data(hwif, hwif->index);
spin_unlock_irq(&ide_lock);
mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL(ide_unregister);
void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
{
memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
hwif->irq = hw->irq;
hwif->chipset = hw->chipset;
hwif->dev = hw->dev;
hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
hwif->ack_intr = hw->ack_intr;
}
EXPORT_SYMBOL_GPL(ide_init_port_hw);
/*
* Locks for IDE setting functionality
*/
DEFINE_MUTEX(ide_setting_mtx);
EXPORT_SYMBOL_GPL(ide_setting_mtx);
/**
* ide_spin_wait_hwgroup - wait for group
* @drive: drive in the group
*
* Wait for an IDE device group to go non busy and then return
* holding the ide_lock which guards the hwgroup->busy status
* and right to use it.
*/
int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
unsigned long timeout = jiffies + (3 * HZ);
spin_lock_irq(&ide_lock);
while (hwgroup->busy) {
unsigned long lflags;
spin_unlock_irq(&ide_lock);
local_irq_set(lflags);
if (time_after(jiffies, timeout)) {
local_irq_restore(lflags);
printk(KERN_ERR "%s: channel busy\n", drive->name);
return -EBUSY;
}
local_irq_restore(lflags);
spin_lock_irq(&ide_lock);
}
return 0;
}
EXPORT_SYMBOL(ide_spin_wait_hwgroup);
int set_io_32bit(ide_drive_t *drive, int arg)
{
if (drive->no_io_32bit)
return -EPERM;
if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->io_32bit = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
static int set_ksettings(ide_drive_t *drive, int arg)
{
if (arg < 0 || arg > 1)
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->keep_settings = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
int set_using_dma(ide_drive_t *drive, int arg)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
ide_hwif_t *hwif = drive->hwif;
int err = -EPERM;
if (arg < 0 || arg > 1)
return -EINVAL;
if (!drive->id || !(drive->id->capability & 1))
goto out;
if (hwif->dma_ops == NULL)
goto out;
err = -EBUSY;
if (ide_spin_wait_hwgroup(drive))
goto out;
/*
* set ->busy flag, unlock and let it ride
*/
hwif->hwgroup->busy = 1;
spin_unlock_irq(&ide_lock);
err = 0;
if (arg) {
if (ide_set_dma(drive))
err = -EIO;
} else
ide_dma_off(drive);
/*
* lock, clear ->busy flag and unlock before leaving
*/
spin_lock_irq(&ide_lock);
hwif->hwgroup->busy = 0;
spin_unlock_irq(&ide_lock);
out:
return err;
#else
if (arg < 0 || arg > 1)
return -EINVAL;
return -EPERM;
#endif
}
int set_pio_mode(ide_drive_t *drive, int arg)
{
struct request *rq;
ide_hwif_t *hwif = drive->hwif;
const struct ide_port_ops *port_ops = hwif->port_ops;
if (arg < 0 || arg > 255)
return -EINVAL;
if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
return -ENOSYS;
if (drive->special.b.set_tune)
return -EBUSY;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
drive->tune_req = (u8) arg;
drive->special.b.set_tune = 1;
blk_execute_rq(drive->queue, NULL, rq, 0);
blk_put_request(rq);
return 0;
}
static int set_unmaskirq(ide_drive_t *drive, int arg)
{
if (drive->no_unmask)
return -EPERM;
if (arg < 0 || arg > 1)
return -EINVAL;
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
drive->unmask = arg;
spin_unlock_irq(&ide_lock);
return 0;
}
static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
{
ide_drive_t *drive = dev->driver_data;
ide_hwif_t *hwif = HWIF(drive);
struct request *rq;
struct request_pm_state rqpm;
ide_task_t args;
int ret;
/* Call ACPI _GTM only once */
if (!(drive->dn % 2))
ide_acpi_get_timing(hwif);
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_SUSPEND;
rq->special = &args;
rq->data = &rqpm;
rqpm.pm_step = ide_pm_state_start_suspend;
if (mesg.event == PM_EVENT_PRETHAW)
mesg.event = PM_EVENT_FREEZE;
rqpm.pm_state = mesg.event;
ret = blk_execute_rq(drive->queue, NULL, rq, 0);
blk_put_request(rq);
/* only call ACPI _PS3 after both drivers are suspended */
if (!ret && (((drive->dn % 2) && hwif->drives[0].present
&& hwif->drives[1].present)
|| !hwif->drives[0].present
|| !hwif->drives[1].present))
ide_acpi_set_state(hwif, 0);
return ret;
}
static int generic_ide_resume(struct device *dev)
{
ide_drive_t *drive = dev->driver_data;
ide_hwif_t *hwif = HWIF(drive);
struct request *rq;
struct request_pm_state rqpm;
ide_task_t args;
int err;
/* Call ACPI _STM only once */
if (!(drive->dn % 2)) {
ide_acpi_set_state(hwif, 1);
ide_acpi_push_timing(hwif);
}
ide_acpi_exec_tfs(drive);
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_PM_RESUME;
rq->cmd_flags |= REQ_PREEMPT;
rq->special = &args;
rq->data = &rqpm;
rqpm.pm_step = ide_pm_state_start_resume;
rqpm.pm_state = PM_EVENT_ON;
err = blk_execute_rq(drive->queue, NULL, rq, 1);
blk_put_request(rq);
if (err == 0 && dev->driver) {
ide_driver_t *drv = to_ide_driver(dev->driver);
if (drv->resume)
drv->resume(drive);
}
return err;
}
static int generic_drive_reset(ide_drive_t *drive)
{
struct request *rq;
int ret = 0;
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_len = 1;
rq->cmd[0] = REQ_DRIVE_RESET;
rq->cmd_flags |= REQ_SOFTBARRIER;
if (blk_execute_rq(drive->queue, NULL, rq, 1))
ret = rq->errors;
blk_put_request(rq);
return ret;
}
int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
unsigned int cmd, unsigned long arg)
{
unsigned long flags;
ide_driver_t *drv;
void __user *p = (void __user *)arg;
int err = 0, (*setfunc)(ide_drive_t *, int);
u8 *val;
switch (cmd) {
case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val;
case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val;
case HDIO_GET_DMA: val = &drive->using_dma; goto read_val;
case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val;
case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val;
case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val;
case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val;
case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val;
}
switch (cmd) {
case HDIO_OBSOLETE_IDENTITY:
case HDIO_GET_IDENTITY:
if (bdev != bdev->bd_contains)
return -EINVAL;
if (drive->id_read == 0)
return -ENOMSG;
if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
return -EFAULT;
return 0;
case HDIO_GET_NICE:
return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP |
drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP |
drive->nice1 << IDE_NICE_1,
(long __user *) arg);
#ifdef CONFIG_IDE_TASK_IOCTL
case HDIO_DRIVE_TASKFILE:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
switch(drive->media) {
case ide_disk:
return ide_taskfile_ioctl(drive, cmd, arg);
default:
return -ENOMSG;
}
#endif /* CONFIG_IDE_TASK_IOCTL */
case HDIO_DRIVE_CMD:
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
return ide_cmd_ioctl(drive, cmd, arg);
case HDIO_DRIVE_TASK:
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
return ide_task_ioctl(drive, cmd, arg);
case HDIO_SET_NICE:
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
return -EPERM;
drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
drv = *(ide_driver_t **)bdev->bd_disk->private_data;
if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
drive->dsc_overlap = 0;
return -EPERM;
}
drive->nice1 = (arg >> IDE_NICE_1) & 1;
return 0;
case HDIO_DRIVE_RESET:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return generic_drive_reset(drive);
case HDIO_GET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
return -EFAULT;
return 0;
case HDIO_SET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
return -EOPNOTSUPP;
default:
return -EINVAL;
}
read_val:
mutex_lock(&ide_setting_mtx);
spin_lock_irqsave(&ide_lock, flags);
err = *val;
spin_unlock_irqrestore(&ide_lock, flags);
mutex_unlock(&ide_setting_mtx);
return err >= 0 ? put_user(err, (long __user *)arg) : err;
set_val:
if (bdev != bdev->bd_contains)
err = -EINVAL;
else {
if (!capable(CAP_SYS_ADMIN))
err = -EACCES;
else {
mutex_lock(&ide_setting_mtx);
err = setfunc(drive, arg);
mutex_unlock(&ide_setting_mtx);
}
}
return err;
}
EXPORT_SYMBOL(generic_ide_ioctl);
static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static char *media_string(ide_drive_t *drive)
{
switch (drive->media) {
case ide_disk:
return "disk";
case ide_cdrom:
return "cdrom";
case ide_tape:
return "tape";
case ide_floppy:
return "floppy";
case ide_optical:
return "optical";
default:
return "UNKNOWN";
}
}
static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", media_string(drive));
}
static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->name);
}
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "ide:m-%s\n", media_string(drive));
}
static ssize_t model_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->model);
}
static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->fw_rev);
}
static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
ide_drive_t *drive = to_ide_device(dev);
return sprintf(buf, "%s\n", drive->id->serial_no);
}
static struct device_attribute ide_dev_attrs[] = {
__ATTR_RO(media),
__ATTR_RO(drivename),
__ATTR_RO(modalias),
__ATTR_RO(model),
__ATTR_RO(firmware),
__ATTR(serial, 0400, serial_show, NULL),
__ATTR_NULL
};
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", media_string(drive));
add_uevent_var(env, "DRIVENAME=%s", drive->name);
add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
return 0;
}
static int generic_ide_probe(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
ide_driver_t *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);
ide_driver_t *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);
ide_driver_t *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_attrs = ide_dev_attrs,
.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, struct kernel_param *kp)
{
int a, b, i, j = 1;
unsigned int *dev_param_mask = (unsigned int *)kp->arg;
if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
sscanf(s, "%d.%d", &a, &b) != 2)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (j)
*dev_param_mask |= (1 << i);
else
*dev_param_mask &= (1 << i);
return 0;
}
static unsigned int ide_nodma;
module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");
static unsigned int ide_noflush;
module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");
static unsigned int ide_noprobe;
module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");
static unsigned int ide_nowerr;
module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
static unsigned int ide_cdroms;
module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 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)
{
int a, b, c = 0, h = 0, s = 0, i, j = 1;
if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || 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)
{
int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
if (ide_nodma & (1 << i)) {
printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
drive->nodma = 1;
}
if (ide_noflush & (1 << i)) {
printk(KERN_INFO "ide: disabling flush requests for %s\n",
drive->name);
drive->noflush = 1;
}
if (ide_noprobe & (1 << i)) {
printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
drive->noprobe = 1;
}
if (ide_nowerr & (1 << i)) {
printk(KERN_INFO "ide: ignoring the WRERR_STAT 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->present = 1;
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;
drive->forced_geom = 1;
printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
drive->name,
drive->cyl, drive->head, drive->sect);
drive->present = 1;
drive->media = ide_disk;
drive->ready_stat = READY_STAT;
}
}
static unsigned int ide_ignore_cable;
static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
int i, j = 1;
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)
{
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;
}
for (i = 0; i < MAX_DRIVES; i++)
ide_dev_apply_params(&hwif->drives[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;
}
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");
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