diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-11-10 09:10:44 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-11-10 09:10:44 +0100 |
commit | a5a64498c194c82ecad3a2d67cff6231cda8d3dd (patch) | |
tree | 723d5d81419f9960b8d30ed9a2ece8a58d6c4328 /drivers/ide/ide-gd.c | |
parent | bb93d802ae5c1949977cc6da247b218240677f11 (diff) | |
parent | f7160c7573615ec82c691e294cf80d920b5d588d (diff) |
Merge commit 'v2.6.28-rc4' into timers/rtc
Conflicts:
drivers/rtc/rtc-cmos.c
Diffstat (limited to 'drivers/ide/ide-gd.c')
-rw-r--r-- | drivers/ide/ide-gd.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c new file mode 100644 index 00000000000..b8078b3231f --- /dev/null +++ b/drivers/ide/ide-gd.c @@ -0,0 +1,401 @@ +#include <linux/module.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/genhd.h> +#include <linux/mutex.h> +#include <linux/ide.h> +#include <linux/hdreg.h> + +#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) +#define IDE_DISK_MINORS (1 << PARTN_BITS) +#else +#define IDE_DISK_MINORS 0 +#endif + +#include "ide-disk.h" +#include "ide-floppy.h" + +#define IDE_GD_VERSION "1.18" + +/* module parameters */ +static unsigned long debug_mask; +module_param(debug_mask, ulong, 0644); + +static DEFINE_MUTEX(ide_disk_ref_mutex); + +static void ide_disk_release(struct kref *); + +static struct ide_disk_obj *ide_disk_get(struct gendisk *disk) +{ + struct ide_disk_obj *idkp = NULL; + + mutex_lock(&ide_disk_ref_mutex); + idkp = ide_drv_g(disk, ide_disk_obj); + if (idkp) { + if (ide_device_get(idkp->drive)) + idkp = NULL; + else + kref_get(&idkp->kref); + } + mutex_unlock(&ide_disk_ref_mutex); + return idkp; +} + +static void ide_disk_put(struct ide_disk_obj *idkp) +{ + ide_drive_t *drive = idkp->drive; + + mutex_lock(&ide_disk_ref_mutex); + kref_put(&idkp->kref, ide_disk_release); + ide_device_put(drive); + mutex_unlock(&ide_disk_ref_mutex); +} + +sector_t ide_gd_capacity(ide_drive_t *drive) +{ + return drive->capacity64; +} + +static int ide_gd_probe(ide_drive_t *); + +static void ide_gd_remove(ide_drive_t *drive) +{ + struct ide_disk_obj *idkp = drive->driver_data; + struct gendisk *g = idkp->disk; + + ide_proc_unregister_driver(drive, idkp->driver); + + del_gendisk(g); + + drive->disk_ops->flush(drive); + + ide_disk_put(idkp); +} + +static void ide_disk_release(struct kref *kref) +{ + struct ide_disk_obj *idkp = to_ide_drv(kref, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + struct gendisk *g = idkp->disk; + + drive->disk_ops = NULL; + drive->driver_data = NULL; + g->private_data = NULL; + put_disk(g); + kfree(idkp); +} + +/* + * On HPA drives the capacity needs to be + * reinitilized on resume otherwise the disk + * can not be used and a hard reset is required + */ +static void ide_gd_resume(ide_drive_t *drive) +{ + if (ata_id_hpa_enabled(drive->id)) + (void)drive->disk_ops->get_capacity(drive); +} + +static void ide_gd_shutdown(ide_drive_t *drive) +{ +#ifdef CONFIG_ALPHA + /* On Alpha, halt(8) doesn't actually turn the machine off, + it puts you into the sort of firmware monitor. Typically, + it's used to boot another kernel image, so it's not much + different from reboot(8). Therefore, we don't need to + spin down the disk in this case, especially since Alpha + firmware doesn't handle disks in standby mode properly. + On the other hand, it's reasonably safe to turn the power + off when the shutdown process reaches the firmware prompt, + as the firmware initialization takes rather long time - + at least 10 seconds, which should be sufficient for + the disk to expire its write cache. */ + if (system_state != SYSTEM_POWER_OFF) { +#else + if (system_state == SYSTEM_RESTART) { +#endif + drive->disk_ops->flush(drive); + return; + } + + printk(KERN_INFO "Shutdown: %s\n", drive->name); + + drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND); +} + +#ifdef CONFIG_IDE_PROC_FS +static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive) +{ + return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc; +} + +static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive) +{ + return (drive->media == ide_disk) ? ide_disk_settings + : ide_floppy_settings; +} +#endif + +static ide_startstop_t ide_gd_do_request(ide_drive_t *drive, + struct request *rq, sector_t sector) +{ + return drive->disk_ops->do_request(drive, rq, sector); +} + +static int ide_gd_end_request(ide_drive_t *drive, int uptodate, int nrsecs) +{ + return drive->disk_ops->end_request(drive, uptodate, nrsecs); +} + +static ide_driver_t ide_gd_driver = { + .gen_driver = { + .owner = THIS_MODULE, + .name = "ide-gd", + .bus = &ide_bus_type, + }, + .probe = ide_gd_probe, + .remove = ide_gd_remove, + .resume = ide_gd_resume, + .shutdown = ide_gd_shutdown, + .version = IDE_GD_VERSION, + .do_request = ide_gd_do_request, + .end_request = ide_gd_end_request, + .error = __ide_error, +#ifdef CONFIG_IDE_PROC_FS + .proc_entries = ide_disk_proc_entries, + .proc_devsets = ide_disk_proc_devsets, +#endif +}; + +static int ide_gd_open(struct block_device *bdev, fmode_t mode) +{ + struct gendisk *disk = bdev->bd_disk; + struct ide_disk_obj *idkp; + ide_drive_t *drive; + int ret = 0; + + idkp = ide_disk_get(disk); + if (idkp == NULL) + return -ENXIO; + + drive = idkp->drive; + + ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__); + + idkp->openers++; + + if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) { + drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; + /* Just in case */ + + ret = drive->disk_ops->init_media(drive, disk); + + /* + * Allow O_NDELAY to open a drive without a disk, or with an + * unreadable disk, so that we can get the format capacity + * of the drive or begin the format - Sam + */ + if (ret && (mode & FMODE_NDELAY) == 0) { + ret = -EIO; + goto out_put_idkp; + } + + if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) { + ret = -EROFS; + goto out_put_idkp; + } + + /* + * Ignore the return code from door_lock, + * since the open() has already succeeded, + * and the door_lock is irrelevant at this point. + */ + drive->disk_ops->set_doorlock(drive, disk, 1); + drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED; + check_disk_change(bdev); + } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) { + ret = -EBUSY; + goto out_put_idkp; + } + return 0; + +out_put_idkp: + idkp->openers--; + ide_disk_put(idkp); + return ret; +} + +static int ide_gd_release(struct gendisk *disk, fmode_t mode) +{ + struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + + ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__); + + if (idkp->openers == 1) + drive->disk_ops->flush(drive); + + if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) { + drive->disk_ops->set_doorlock(drive, disk, 0); + drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; + } + + idkp->openers--; + + ide_disk_put(idkp); + + return 0; +} + +static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + + geo->heads = drive->bios_head; + geo->sectors = drive->bios_sect; + geo->cylinders = (u16)drive->bios_cyl; /* truncate */ + return 0; +} + +static int ide_gd_media_changed(struct gendisk *disk) +{ + struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + int ret; + + /* do not scan partitions twice if this is a removable device */ + if (drive->dev_flags & IDE_DFLAG_ATTACH) { + drive->dev_flags &= ~IDE_DFLAG_ATTACH; + return 0; + } + + ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED); + drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED; + + return ret; +} + +static int ide_gd_revalidate_disk(struct gendisk *disk) +{ + struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + + if (ide_gd_media_changed(disk)) + drive->disk_ops->get_capacity(drive); + + set_capacity(disk, ide_gd_capacity(drive)); + return 0; +} + +static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj); + ide_drive_t *drive = idkp->drive; + + return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg); +} + +static struct block_device_operations ide_gd_ops = { + .owner = THIS_MODULE, + .open = ide_gd_open, + .release = ide_gd_release, + .locked_ioctl = ide_gd_ioctl, + .getgeo = ide_gd_getgeo, + .media_changed = ide_gd_media_changed, + .revalidate_disk = ide_gd_revalidate_disk +}; + +static int ide_gd_probe(ide_drive_t *drive) +{ + const struct ide_disk_ops *disk_ops = NULL; + struct ide_disk_obj *idkp; + struct gendisk *g; + + /* strstr("foo", "") is non-NULL */ + if (!strstr("ide-gd", drive->driver_req)) + goto failed; + +#ifdef CONFIG_IDE_GD_ATA + if (drive->media == ide_disk) + disk_ops = &ide_ata_disk_ops; +#endif +#ifdef CONFIG_IDE_GD_ATAPI + if (drive->media == ide_floppy) + disk_ops = &ide_atapi_disk_ops; +#endif + if (disk_ops == NULL) + goto failed; + + if (disk_ops->check(drive, DRV_NAME) == 0) { + printk(KERN_ERR PFX "%s: not supported by this driver\n", + drive->name); + goto failed; + } + + idkp = kzalloc(sizeof(*idkp), GFP_KERNEL); + if (!idkp) { + printk(KERN_ERR PFX "%s: can't allocate a disk structure\n", + drive->name); + goto failed; + } + + g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif)); + if (!g) + goto out_free_idkp; + + ide_init_disk(g, drive); + + kref_init(&idkp->kref); + + idkp->drive = drive; + idkp->driver = &ide_gd_driver; + idkp->disk = g; + + g->private_data = &idkp->driver; + + drive->driver_data = idkp; + drive->debug_mask = debug_mask; + drive->disk_ops = disk_ops; + + disk_ops->setup(drive); + + set_capacity(g, ide_gd_capacity(drive)); + + g->minors = IDE_DISK_MINORS; + g->driverfs_dev = &drive->gendev; + g->flags |= GENHD_FL_EXT_DEVT; + if (drive->dev_flags & IDE_DFLAG_REMOVABLE) + g->flags = GENHD_FL_REMOVABLE; + g->fops = &ide_gd_ops; + add_disk(g); + return 0; + +out_free_idkp: + kfree(idkp); +failed: + return -ENODEV; +} + +static int __init ide_gd_init(void) +{ + printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n"); + return driver_register(&ide_gd_driver.gen_driver); +} + +static void __exit ide_gd_exit(void) +{ + driver_unregister(&ide_gd_driver.gen_driver); +} + +MODULE_ALIAS("ide:*m-disk*"); +MODULE_ALIAS("ide-disk"); +MODULE_ALIAS("ide:*m-floppy*"); +MODULE_ALIAS("ide-floppy"); +module_init(ide_gd_init); +module_exit(ide_gd_exit); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("generic ATA/ATAPI disk driver"); 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