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path: root/drivers/ide/ide-gd.c
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Diffstat (limited to 'drivers/ide/ide-gd.c')
-rw-r--r--drivers/ide/ide-gd.c398
1 files changed, 398 insertions, 0 deletions
diff --git a/drivers/ide/ide-gd.c b/drivers/ide/ide-gd.c
new file mode 100644
index 000000000000..d44898f46c33
--- /dev/null
+++ b/drivers/ide/ide-gd.c
@@ -0,0 +1,398 @@
+#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 inode *inode, struct file *filp)
+{
+ struct gendisk *disk = inode->i_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 && (filp->f_flags & O_NDELAY) == 0) {
+ ret = -EIO;
+ goto out_put_idkp;
+ }
+
+ if ((drive->dev_flags & IDE_DFLAG_WP) && (filp->f_mode & 2)) {
+ 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(inode->i_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 inode *inode, struct file *filp)
+{
+ struct gendisk *disk = inode->i_bdev->bd_disk;
+ 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);
+ set_capacity(disk, ide_gd_capacity(idkp->drive));
+ return 0;
+}
+
+static int ide_gd_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct block_device *bdev = inode->i_bdev;
+ 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, inode, file, cmd, arg);
+}
+
+static struct block_device_operations ide_gd_ops = {
+ .owner = THIS_MODULE,
+ .open = ide_gd_open,
+ .release = ide_gd_release,
+ .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");