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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/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/reboot.h>
#include <linux/cdrom.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.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 };
static int idebus_parameter; /* holds the "idebus=" parameter */
static int system_bus_speed; /* holds what we think is VESA/PCI bus speed */
DEFINE_MUTEX(ide_cfg_mtx);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
int noautodma = 0;
#ifdef CONFIG_BLK_DEV_IDEACPI
int ide_noacpi = 0;
int ide_noacpitfs = 1;
int ide_noacpionboot = 1;
#endif
/*
* This is declared extern in ide.h, for access by other IDE modules:
*/
ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
EXPORT_SYMBOL(ide_hwifs);
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);
}
EXPORT_SYMBOL_GPL(ide_init_port_data);
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->ctl = 0x08;
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);
}
}
/*
* init_ide_data() sets reasonable default values into all fields
* of all instances of the hwifs and drives, but only on the first call.
* Subsequent calls have no effect (they don't wipe out anything).
*
* This routine is normally called at driver initialization time,
* but may also be called MUCH earlier during kernel "command-line"
* parameter processing. As such, we cannot depend on any other parts
* of the kernel (such as memory allocation) to be functioning yet.
*
* This is too bad, as otherwise we could dynamically allocate the
* ide_drive_t structs as needed, rather than always consuming memory
* for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
*
* FIXME: We should stuff the setup data into __init and copy the
* relevant hwifs/allocate them properly during boot.
*/
#define MAGIC_COOKIE 0x12345678
static void __init init_ide_data (void)
{
unsigned int index;
static unsigned long magic_cookie = MAGIC_COOKIE;
if (magic_cookie != MAGIC_COOKIE)
return; /* already initialized */
magic_cookie = 0;
/* Initialise all interface structures */
for (index = 0; index < MAX_HWIFS; ++index) {
ide_hwif_t *hwif = &ide_hwifs[index];
ide_init_port_data(hwif, index);
}
}
/**
* ide_system_bus_speed - guess bus speed
*
* ide_system_bus_speed() returns what we think is the system VESA/PCI
* bus speed (in MHz). This is used for calculating interface PIO timings.
* The default is 40 for known PCI systems, 50 otherwise.
* The "idebus=xx" parameter can be used to override this value.
* The actual value to be used is computed/displayed the first time
* through. Drivers should only use this as a last resort.
*
* Returns a guessed speed in MHz.
*/
static int ide_system_bus_speed(void)
{
#ifdef CONFIG_PCI
static struct pci_device_id pci_default[] = {
{ PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
{ }
};
#else
#define pci_default 0
#endif /* CONFIG_PCI */
/* user supplied value */
if (idebus_parameter)
return idebus_parameter;
/* safe default value for PCI or VESA and PCI*/
return pci_dev_present(pci_default) ? 33 : 50;
}
ide_hwif_t * ide_find_port(unsigned long base)
{
ide_hwif_t *hwif;
int i;
for (i = 0; i < MAX_HWIFS; i++) {
hwif = &ide_hwifs[i];
if (hwif->io_ports[IDE_DATA_OFFSET] == base)
goto found;
}
for (i = 0; i < MAX_HWIFS; i++) {
hwif = &ide_hwifs[i];
if (hwif->chipset == ide_unknown)
goto found;
}
hwif = NULL;
found:
return hwif;
}
EXPORT_SYMBOL_GPL(ide_find_port);
static struct resource* hwif_request_region(ide_hwif_t *hwif,
unsigned long addr, int num)
{
struct resource *res = request_region(addr, num, hwif->name);
if (!res)
printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
hwif->name, addr, addr+num-1);
return res;
}
/**
* ide_hwif_request_regions - request resources for IDE
* @hwif: interface to use
*
* Requests all the needed resources for an interface.
* Right now core IDE code does this work which is deeply wrong.
* MMIO leaves it to the controller driver,
* PIO will migrate this way over time.
*/
int ide_hwif_request_regions(ide_hwif_t *hwif)
{
unsigned long addr;
unsigned int i;
if (hwif->mmio)
return 0;
addr = hwif->io_ports[IDE_CONTROL_OFFSET];
if (addr && !hwif_request_region(hwif, addr, 1))
goto control_region_busy;
hwif->straight8 = 0;
addr = hwif->io_ports[IDE_DATA_OFFSET];
if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
if (!hwif_request_region(hwif, addr, 8))
goto data_region_busy;
hwif->straight8 = 1;
return 0;
}
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
addr = hwif->io_ports[i];
if (!hwif_request_region(hwif, addr, 1)) {
while (--i)
release_region(addr, 1);
goto data_region_busy;
}
}
return 0;
data_region_busy:
addr = hwif->io_ports[IDE_CONTROL_OFFSET];
if (addr)
release_region(addr, 1);
control_region_busy:
/* If any errors are return, we drop the hwif interface. */
return -EBUSY;
}
/**
* ide_hwif_release_regions - free IDE resources
*
* Note that we only release the standard ports,
* and do not even try to handle any extra ports
* allocated for weird IDE interface chipsets.
*
* Note also that we don't yet handle mmio resources here. More
* importantly our caller should be doing this so we need to
* restructure this as a helper function for drivers.
*/
void ide_hwif_release_regions(ide_hwif_t *hwif)
{
u32 i = 0;
if (hwif->mmio)
return;
if (hwif->io_ports[IDE_CONTROL_OFFSET])
release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
if (hwif->straight8) {
release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
return;
}
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
if (hwif->io_ports[i])
release_region(hwif->io_ports[i], 1);
}
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
* @index: index of interface (will change soon to a pointer)
*
* 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(unsigned int index)
{
ide_hwif_t *hwif, *g;
ide_hwgroup_t *hwgroup;
int irq_count = 0;
BUG_ON(index >= MAX_HWIFS);
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
mutex_lock(&ide_cfg_mtx);
spin_lock_irq(&ide_lock);
hwif = &ide_hwifs[index];
if (!hwif->present)
goto abort;
__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);
spin_lock_irq(&ide_lock);
if (hwif->dma_base)
(void)ide_release_dma(hwif);
ide_hwif_release_regions(hwif);
/* restore hwif data to pristine status */
ide_init_port_data(hwif, index);
abort:
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->noprobe = 0;
hwif->chipset = hw->chipset;
hwif->gendev.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_host_set == 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;
if (arg < 0 || arg > 255)
return -EINVAL;
if (drive->hwif->set_pio_mode == NULL)
return -ENOSYS;
if (drive->special.b.set_tune)
return -EBUSY;
ide_init_drive_cmd(&rq);
rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
drive->tune_req = (u8) arg;
drive->special.b.set_tune = 1;
(void) ide_do_drive_cmd(drive, &rq, ide_wait);
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;
}
/**
* system_bus_clock - clock guess
*
* External version of the bus clock guess used by very old IDE drivers
* for things like VLB timings. Should not be used.
*/
int system_bus_clock (void)
{
return system_bus_speed;
}
EXPORT_SYMBOL(system_bus_clock);
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(&rq, 0, sizeof(rq));
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
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 = ide_do_drive_cmd(drive, &rq, ide_wait);
/* 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(&rq, 0, sizeof(rq));
memset(&rqpm, 0, sizeof(rqpm));
memset(&args, 0, sizeof(args));
rq.cmd_type = REQ_TYPE_PM_RESUME;
rq.special = &args;
rq.data = &rqpm;
rqpm.pm_step = ide_pm_state_start_resume;
rqpm.pm_state = PM_EVENT_ON;
err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
if (err == 0 && dev->driver) {
ide_driver_t *drv = to_ide_driver(dev->driver);
if (drv->resume)
drv->resume(drive);
}
return err;
}
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;
/*
* Abort the current command on the
* group if there is one, taking
* care not to allow anything else
* to be queued and to die on the
* spot if we miss one somehow
*/
spin_lock_irqsave(&ide_lock, flags);
if (HWGROUP(drive)->resetting) {
spin_unlock_irqrestore(&ide_lock, flags);
return -EBUSY;
}
ide_abort(drive, "drive reset");
BUG_ON(HWGROUP(drive)->handler);
/* Ensure nothing gets queued after we
drop the lock. Reset will clear the busy */
HWGROUP(drive)->busy = 1;
spin_unlock_irqrestore(&ide_lock, flags);
(void) ide_do_reset(drive);
return 0;
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);
/*
* stridx() returns the offset of c within s,
* or -1 if c is '\0' or not found within s.
*/
static int __init stridx (const char *s, char c)
{
char *i = strchr(s, c);
return (i && c) ? i - s : -1;
}
/*
* match_parm() does parsing for ide_setup():
*
* 1. the first char of s must be '='.
* 2. if the remainder matches one of the supplied keywords,
* the index (1 based) of the keyword is negated and returned.
* 3. if the remainder is a series of no more than max_vals numbers
* separated by commas, the numbers are saved in vals[] and a
* count of how many were saved is returned. Base10 is assumed,
* and base16 is allowed when prefixed with "0x".
* 4. otherwise, zero is returned.
*/
static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
{
static const char *decimal = "0123456789";
static const char *hex = "0123456789abcdef";
int i, n;
if (*s++ == '=') {
/*
* Try matching against the supplied keywords,
* and return -(index+1) if we match one
*/
if (keywords != NULL) {
for (i = 0; *keywords != NULL; ++i) {
if (!strcmp(s, *keywords++))
return -(i+1);
}
}
/*
* Look for a series of no more than "max_vals"
* numeric values separated by commas, in base10,
* or base16 when prefixed with "0x".
* Return a count of how many were found.
*/
for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
vals[n] = i;
while ((i = stridx(decimal, *++s)) >= 0)
vals[n] = (vals[n] * 10) + i;
if (*s == 'x' && !vals[n]) {
while ((i = stridx(hex, *++s)) >= 0)
vals[n] = (vals[n] * 0x10) + i;
}
if (++n == max_vals)
break;
if (*s == ',' || *s == ';')
++s;
}
if (!*s)
return n;
}
return 0; /* zero = nothing matched */
}
extern int probe_ali14xx;
extern int probe_umc8672;
extern int probe_dtc2278;
extern int probe_ht6560b;
extern int probe_qd65xx;
extern int cmd640_vlb;
extern int probe_4drives;
static int __initdata is_chipset_set;
/*
* ide_setup() gets called VERY EARLY during initialization,
* to handle kernel "command line" strings beginning with "hdx=" or "ide".
*
* Remember to update Documentation/ide/ide.txt if you change something here.
*/
static int __init ide_setup(char *s)
{
int i, vals[3];
ide_hwif_t *hwif;
ide_drive_t *drive;
unsigned int hw, unit;
const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
const char max_hwif = '0' + (MAX_HWIFS - 1);
if (strncmp(s,"hd",2) == 0 && s[2] == '=') /* hd= is for hd.c */
return 0; /* driver and not us */
if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
return 0;
printk(KERN_INFO "ide_setup: %s", s);
init_ide_data ();
#ifdef CONFIG_BLK_DEV_IDEDOUBLER
if (!strcmp(s, "ide=doubler")) {
extern int ide_doubler;
printk(" : Enabled support for IDE doublers\n");
ide_doubler = 1;
return 1;
}
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
if (!strcmp(s, "ide=nodma")) {
printk(" : Prevented DMA\n");
noautodma = 1;
goto obsolete_option;
}
#ifdef CONFIG_BLK_DEV_IDEACPI
if (!strcmp(s, "ide=noacpi")) {
//printk(" : Disable IDE ACPI support.\n");
ide_noacpi = 1;
return 1;
}
if (!strcmp(s, "ide=acpigtf")) {
//printk(" : Enable IDE ACPI _GTF support.\n");
ide_noacpitfs = 0;
return 1;
}
if (!strcmp(s, "ide=acpionboot")) {
//printk(" : Call IDE ACPI methods on boot.\n");
ide_noacpionboot = 0;
return 1;
}
#endif /* CONFIG_BLK_DEV_IDEACPI */
/*
* Look for drive options: "hdx="
*/
if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
const char *hd_words[] = {
"none", "noprobe", "nowerr", "cdrom", "nodma",
"autotune", "noautotune", "-8", "-9", "-10",
"noflush", "remap", "remap63", "scsi", NULL };
unit = s[2] - 'a';
hw = unit / MAX_DRIVES;
unit = unit % MAX_DRIVES;
hwif = &ide_hwifs[hw];
drive = &hwif->drives[unit];
if (strncmp(s + 4, "ide-", 4) == 0) {
strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
goto obsolete_option;
}
switch (match_parm(&s[3], hd_words, vals, 3)) {
case -1: /* "none" */
case -2: /* "noprobe" */
drive->noprobe = 1;
goto done;
case -3: /* "nowerr" */
drive->bad_wstat = BAD_R_STAT;
hwif->noprobe = 0;
goto done;
case -4: /* "cdrom" */
drive->present = 1;
drive->media = ide_cdrom;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
hwif->noprobe = 0;
goto done;
case -5: /* nodma */
drive->nodma = 1;
goto done;
case -6: /* "autotune" */
drive->autotune = IDE_TUNE_AUTO;
goto obsolete_option;
case -7: /* "noautotune" */
drive->autotune = IDE_TUNE_NOAUTO;
goto obsolete_option;
case -11: /* noflush */
drive->noflush = 1;
goto done;
case -12: /* "remap" */
drive->remap_0_to_1 = 1;
goto obsolete_option;
case -13: /* "remap63" */
drive->sect0 = 63;
goto obsolete_option;
case -14: /* "scsi" */
drive->scsi = 1;
goto obsolete_option;
case 3: /* cyl,head,sect */
drive->media = ide_disk;
drive->ready_stat = READY_STAT;
drive->cyl = drive->bios_cyl = vals[0];
drive->head = drive->bios_head = vals[1];
drive->sect = drive->bios_sect = vals[2];
drive->present = 1;
drive->forced_geom = 1;
hwif->noprobe = 0;
goto done;
default:
goto bad_option;
}
}
if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
goto bad_option;
/*
* Look for bus speed option: "idebus="
*/
if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
if (match_parm(&s[6], NULL, vals, 1) != 1)
goto bad_option;
if (vals[0] >= 20 && vals[0] <= 66) {
idebus_parameter = vals[0];
} else
printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
goto done;
}
/*
* Look for interface options: "idex="
*/
if (s[3] >= '0' && s[3] <= max_hwif) {
/*
* Be VERY CAREFUL changing this: note hardcoded indexes below
* (-8, -9, -10) are reserved to ease the hardcoding.
*/
static const char *ide_words[] = {
"minus1", "serialize", "minus3", "minus4",
"reset", "minus6", "ata66", "minus8", "minus9",
"minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
"dtc2278", "umc8672", "ali14xx", NULL };
hw = s[3] - '0';
hwif = &ide_hwifs[hw];
i = match_parm(&s[4], ide_words, vals, 3);
/*
* Cryptic check to ensure chipset not already set for hwif.
* Note: we can't depend on hwif->chipset here.
*/
if (i >= -18 && i <= -11) {
/* chipset already specified */
if (is_chipset_set)
goto bad_option;
/* these drivers are for "ide0=" only */
if (hw != 0)
goto bad_hwif;
is_chipset_set = 1;
printk("\n");
}
switch (i) {
#ifdef CONFIG_BLK_DEV_ALI14XX
case -17: /* "ali14xx" */
probe_ali14xx = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_UMC8672
case -16: /* "umc8672" */
probe_umc8672 = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_DTC2278
case -15: /* "dtc2278" */
probe_dtc2278 = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_CMD640
case -14: /* "cmd640_vlb" */
cmd640_vlb = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_HT6560B
case -13: /* "ht6560b" */
probe_ht6560b = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_QD65XX
case -12: /* "qd65xx" */
probe_qd65xx = 1;
goto obsolete_option;
#endif
#ifdef CONFIG_BLK_DEV_4DRIVES
case -11: /* "four" drives on one set of ports */
probe_4drives = 1;
goto obsolete_option;
#endif
case -10: /* minus10 */
case -9: /* minus9 */
case -8: /* minus8 */
case -6:
case -4:
case -3:
goto bad_option;
case -7: /* ata66 */
#ifdef CONFIG_BLK_DEV_IDEPCI
/*
* Use ATA_CBL_PATA40_SHORT so drive side
* cable detection is also overriden.
*/
hwif->cbl = ATA_CBL_PATA40_SHORT;
goto obsolete_option;
#else
goto bad_hwif;
#endif
case -5: /* "reset" */
hwif->reset = 1;
goto obsolete_option;
case -2: /* "serialize" */
hwif->mate = &ide_hwifs[hw^1];
hwif->mate->mate = hwif;
hwif->serialized = hwif->mate->serialized = 1;
goto obsolete_option;
case -1:
case 0:
case 1:
case 2:
case 3:
goto bad_option;
default:
printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
return 1;
}
}
bad_option:
printk(" -- BAD OPTION\n");
return 1;
obsolete_option:
printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
return 1;
bad_hwif:
printk("-- NOT SUPPORTED ON ide%d", hw);
done:
printk("\n");
return 1;
}
EXPORT_SYMBOL(ide_lock);
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);
static void ide_port_class_release(struct device *portdev)
{
ide_hwif_t *hwif = dev_get_drvdata(portdev);
put_device(&hwif->gendev);
}
/*
* 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");
system_bus_speed = ide_system_bus_speed();
printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
"for PIO modes%s\n", system_bus_speed,
idebus_parameter ? "" : "; override with idebus=xx");
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_port_class->dev_release = ide_port_class_release;
init_ide_data();
proc_ide_create();
return 0;
out_port_class:
bus_unregister(&ide_bus_type);
return ret;
}
#ifdef MODULE
static char *options = NULL;
module_param(options, charp, 0);
MODULE_LICENSE("GPL");
static void __init parse_options (char *line)
{
char *next = line;
if (line == NULL || !*line)
return;
while ((line = next) != NULL) {
if ((next = strchr(line,' ')) != NULL)
*next++ = 0;
if (!ide_setup(line))
printk (KERN_INFO "Unknown option '%s'\n", line);
}
}
int __init init_module (void)
{
parse_options(options);
return ide_init();
}
void __exit cleanup_module (void)
{
int index;
for (index = 0; index < MAX_HWIFS; ++index)
ide_unregister(index);
proc_ide_destroy();
class_destroy(ide_port_class);
bus_unregister(&ide_bus_type);
}
#else /* !MODULE */
__setup("", ide_setup);
module_init(ide_init);
#endif /* MODULE */
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