/*
* linux/drivers/ide/ide-disk.c Version 1.18 Mar 05, 2003
*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyright (C) 1998-2002 Linux ATA Development
* Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2003 Red Hat <alan@redhat.com>
*/
/*
* Mostly written by Mark Lord <mlord@pobox.com>
* and Gadi Oxman <gadio@netvision.net.il>
* and Andre Hedrick <andre@linux-ide.org>
*
* This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
*
* Version 1.00 move disk only code from ide.c to ide-disk.c
* support optional byte-swapping of all data
* Version 1.01 fix previous byte-swapping code
* Version 1.02 remove ", LBA" from drive identification msgs
* Version 1.03 fix display of id->buf_size for big-endian
* Version 1.04 add /proc configurable settings and S.M.A.R.T support
* Version 1.05 add capacity support for ATA3 >= 8GB
* Version 1.06 get boot-up messages to show full cyl count
* Version 1.07 disable door-locking if it fails
* Version 1.08 fixed CHS/LBA translations for ATA4 > 8GB,
* process of adding new ATA4 compliance.
* fixed problems in allowing fdisk to see
* the entire disk.
* Version 1.09 added increment of rq->sector in ide_multwrite
* added UDMA 3/4 reporting
* Version 1.10 request queue changes, Ultra DMA 100
* Version 1.11 added 48-bit lba
* Version 1.12 adding taskfile io access method
* Version 1.13 added standby and flush-cache for notifier
* Version 1.14 added acoustic-wcache
* Version 1.15 convert all calls to ide_raw_taskfile
* since args will return register content.
* Version 1.16 added suspend-resume-checkpower
* Version 1.17 do flush on standy, do flush on ATA < ATA6
* fix wcache setup.
*/
#define IDEDISK_VERSION "1.18"
#undef REALLY_SLOW_IO /* most systems can safely undef this */
//#define DEBUG
#include <linux/config.h>
#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/slab.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/leds.h>
#define _IDE_DISK
#include <linux/ide.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/div64.h>
struct ide_disk_obj {
ide_drive_t *drive;
ide_driver_t *driver;
struct gendisk *disk;
struct kref kref;
};
static DEFINE_MUTEX(idedisk_ref_mutex);
#define to_ide_disk(obj) container_of(obj, struct ide_disk_obj, kref)
#define ide_disk_g(disk) \
container_of((disk)->private_data, struct ide_disk_obj, driver)
static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
{
struct ide_disk_obj *idkp = NULL;
mutex_lock(&idedisk_ref_mutex);
idkp = ide_disk_g(disk);
if (idkp)
kref_get(&idkp->kref);
mutex_unlock(&idedisk_ref_mutex);
return idkp;
}
static void ide_disk_release(struct kref *);
static void ide_disk_put(struct ide_disk_obj *idkp)
{
mutex_lock(&idedisk_ref_mutex);
kref_put(&idkp->kref, ide_disk_release);
mutex_unlock(&idedisk_ref_mutex);
}
/*
* lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
* value for this drive (from its reported identification information).
*
* Returns: 1 if lba_capacity looks sensible
* 0 otherwise
*
* It is called only once for each drive.
*/
static int lba_capacity_is_ok (struct hd_driveid *id)
{
unsigned long lba_sects, chs_sects, head, tail;
/* No non-LBA info .. so valid! */
if (id->cyls == 0)
return 1;
/*
* The ATA spec tells large drives to return
* C/H/S = 16383/16/63 independent of their size.
* Some drives can be jumpered to use 15 heads instead of 16.
* Some drives can be jumpered to use 4092 cyls instead of 16383.
*/
if ((id->cyls == 16383
|| (id->cyls == 4092 && id->cur_cyls == 16383)) &&
id->sectors == 63 &&
(id->heads == 15 || id->heads == 16)