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/*
* linux/drivers/ide/ide.c Version 6.31 June 9, 2000
*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
*/
/*
* 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.
*
* Primary: ide0, port 0x1f0; major=3; hda is minor=0; hdb is minor=64
* Secondary: ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
* Tertiary: ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
* Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
* ...
*
* 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
*
* Version 1.0 ALPHA initial code, primary i/f working okay
* Version 1.3 BETA dual i/f on shared irq tested & working!
* Version 1.4 BETA added auto probing for irq(s)
* Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
* ...
* Version 5.50 allow values as small as 20 for idebus=
* Version 5.51 force non io_32bit in drive_cmd_intr()
* change delay_10ms() to delay_50ms() to fix problems
* Version 5.52 fix incorrect invalidation of removable devices
* add "hdx=slow" command line option
* Version 5.60 start to modularize the driver; the disk and ATAPI
* drivers can be compiled as loadable modules.
* move IDE probe code to ide-probe.c
* move IDE disk code to ide-disk.c
* add support for generic IDE device subdrivers
* add m68k code from Geert Uytterhoeven
* probe all interfaces by default
* add ioctl to (re)probe an interface
* Version 6.00 use per device request queues
* attempt to optimize shared hwgroup performance
* add ioctl to manually adjust bandwidth algorithms
* add kerneld support for the probe module
* fix bug in ide_error()
* fix bug in the first ide_get_lock() call for Atari
* don't flush leftover data for ATAPI devices
* Version 6.01 clear hwgroup->active while the hwgroup sleeps
* support HDIO_GETGEO for floppies
* Version 6.02 fix ide_ack_intr() call
* check partition table on floppies
* Version 6.03 handle bad status bit sequencing in ide_wait_stat()
* Version 6.10 deleted old entries from this list of updates
* replaced triton.c with ide-dma.c generic PCI DMA
* added support for BIOS-enabled UltraDMA
* rename all "promise" things to "pdc4030"
* fix EZ-DRIVE handling on small disks
* Version 6.11 fix probe error in ide_scan_devices()
* fix ancient "jiffies" polling bugs
* mask all hwgroup interrupts on each irq entry
* Version 6.12 integrate ioctl and proc interfaces
* fix parsing of "idex=" command line parameter
* Version 6.13 add support for ide4/ide5 courtesy rjones@orchestream.com
* Version 6.14 fixed IRQ sharing among PCI devices
* Version 6.15 added SMP awareness to IDE drivers
* Version 6.16 fixed various bugs; even more SMP friendly
* Version 6.17 fix for newest EZ-Drive problem
* Version 6.18 default unpartitioned-disk translation now "BIOS LBA"
* Version 6.19 Re-design for a UNIFORM driver for all platforms,
* model based on suggestions from Russell King and
* Geert Uytterhoeven
* Promise DC4030VL now supported.
* add support for ide6/ide7
* delay_50ms() changed to ide_delay_50ms() and exported.
* Version 6.20 Added/Fixed Generic ATA-66 support and hwif detection.
* Added hdx=flash to allow for second flash disk
* detection w/o the hang loop.
* Added support for ide8/ide9
* Added idex=ata66 for the quirky chipsets that are
* ATA-66 compliant, but have yet to determine a method
* of verification of the 80c cable presence.
* Specifically Promise's PDC20262 chipset.
* Version 6.21 Fixing/Fixed SMP spinlock issue with insight from an old
* hat that clarified original low level driver design.
* Version 6.30 Added SMP support; fixed multmode issues. -ml
* Version 6.31 Debug Share INTR's and request queue streaming
* Native ATA-100 support
* Prep for Cascades Project
*
* Some additional driver compile-time options are in ./include/linux/ide.h
*
* To do, in likely order of completion:
* - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
*
*/
#define REVISION "Revision: 6.31"
#define VERSION "Id: ide.c 6.31 2000/06/09"
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#define _IDE_C /* Tell ide.h it's really us */
#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/blkpg.h>
#include <linux/slab.h>
#ifndef MODULE
#include <linux/init.h>
#endif /* MODULE */
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/completion.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/bitops.h>
#include "ide_modes.h"
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif /* CONFIG_KMOD */
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
static const byte 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 */
static int initializing; /* set while initializing built-in drivers */
#ifdef CONFIG_BLK_DEV_IDEPCI
static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
#endif /* CONFIG_BLK_DEV_IDEPCI */
#if defined(__mc68000__) || defined(CONFIG_APUS)
/*
* ide_lock is used by the Atari code to obtain access to the IDE interrupt,
* which is shared between several drivers.
*/
static int ide_lock;
#endif /* __mc68000__ || CONFIG_APUS */
int noautodma = 0;
/*
* ide_modules keeps track of the available IDE chipset/probe/driver modules.
*/
ide_module_t *ide_modules;
ide_module_t *ide_probe;
/*
* This is declared extern in ide.h, for access by other IDE modules:
*/
ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
#if (DISK_RECOVERY_TIME > 0)
/*
* For really screwy hardware (hey, at least it *can* be used with Linux)
* we can enforce a minimum delay time between successive operations.
*/
static unsigned long read_timer (void)
{
unsigned long t, flags;
int i;
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
t = jiffies * 11932;
outb_p(0, 0x43);
i = inb_p(0x40);
i |= inb(0x40) << 8;
__restore_flags(flags); /* local CPU only */
return (t - i);
}
#endif /* DISK_RECOVERY_TIME */
static inline void set_recovery_timer (ide_hwif_t *hwif)
{
#if (DISK_RECOVERY_TIME > 0)
hwif->last_time = read_timer();
#endif /* DISK_RECOVERY_TIME */
}
/*
* Do not even *think* about calling this!
*/
static void init_hwif_data (unsigned int index)
{
unsigned int unit;
hw_regs_t hw;
ide_hwif_t *hwif = &ide_hwifs[index];
/* bulk initialize hwif & drive info with zeros */
memset(hwif, 0, sizeof(ide_hwif_t));
memset(&hw, 0, sizeof(hw_regs_t));
/* fill in any non-zero initial values */
hwif->index = index;
ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
memcpy(&hwif->hw, &hw, sizeof(hw));
memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
#ifdef CONFIG_BLK_DEV_HD
if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
hwif->noprobe = 1; /* may be overridden by ide_setup() */
#endif /* CONFIG_BLK_DEV_HD */
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;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
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' + (index * MAX_DRIVES) + unit;
drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
init_waitqueue_head(&drive->wqueue);
}
}
/*
* 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.
*/
#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)
init_hwif_data(index);
/* Add default hw interfaces */
ide_init_default_hwifs();
idebus_parameter = 0;
system_bus_speed = 0;
}
/*
* CompactFlash cards and their brethern pretend to be removable hard disks, except:
* (1) they never have a slave unit, and
* (2) they don't have doorlock mechanisms.
* This test catches them, and is invoked elsewhere when setting appropriate config bits.
*
* FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD) devices,
* so in linux 2.3.x we should change this to just treat all PCMCIA drives this way,
* and get rid of the model-name tests below (too big of an interface change for 2.2.x).
* At that time, we might also consider parameterizing the timeouts and retries,
* since these are MUCH faster than mechanical drives. -M.Lord
*/
int drive_is_flashcard (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
if (drive->removable && id != NULL) {
if (id->config == 0x848a) return 1; /* CompactFlash */
if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */
|| !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */
|| !strncmp(id->model, "SunDisk SDCFB", 13) /* SunDisk */
|| !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
|| !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */
|| !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
{
return 1; /* yes, it is a flash memory card */
}
}
return 0; /* no, it is not a flash memory card */
}
/*
* 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.
*/
int ide_system_bus_speed (void)
{
if (!system_bus_speed) {
if (idebus_parameter)
system_bus_speed = idebus_parameter; /* user supplied value */
#ifdef CONFIG_PCI
else if (pci_present())
system_bus_speed = 33; /* safe default value for PCI */
#endif /* CONFIG_PCI */
else
system_bus_speed = 50; /* safe default value for VESA and PCI */
printk("ide: Assuming %dMHz system bus speed for PIO modes%s\n", system_bus_speed,
idebus_parameter ? "" : "; override with idebus=xx");
}
return system_bus_speed;
}
#if SUPPORT_VLB_SYNC
/*
* Some localbus EIDE interfaces require a special access sequence
* when using 32-bit I/O instructions to transfer data. We call this
* the "vlb_sync" sequence, which consists of three successive reads
* of the sector count register location, with interrupts disabled
* to ensure that the reads all happen together.
*/
static inline void do_vlb_sync (ide_ioreg_t port) {
(void) inb (port);
(void) inb (port);
(void) inb (port);
}
#endif /* SUPPORT_VLB_SYNC */
/*
* This is used for most PIO data transfers *from* the IDE interface
*/
void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
{
byte io_32bit;
/* first check if this controller has defined a special function
* for handling polled ide transfers
*/
if(HWIF(drive)->ideproc) {
HWIF(drive)->ideproc(ideproc_ide_input_data,
drive, buffer, wcount);
return;
}
io_32bit = drive->io_32bit;
if (io_32bit) {
#if SUPPORT_VLB_SYNC
if (io_32bit & 2) {
unsigned long flags;
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
do_vlb_sync(IDE_NSECTOR_REG);
insl(IDE_DATA_REG, buffer, wcount);
__restore_flags(flags); /* local CPU only */
} else
#endif /* SUPPORT_VLB_SYNC */
insl(IDE_DATA_REG, buffer, wcount);
} else {
#if SUPPORT_SLOW_DATA_PORTS
if (drive->slow) {
unsigned short *ptr = (unsigned short *) buffer;
while (wcount--) {
*ptr++ = inw_p(IDE_DATA_REG);
*ptr++ = inw_p(IDE_DATA_REG);
}
} else
#endif /* SUPPORT_SLOW_DATA_PORTS */
insw(IDE_DATA_REG, buffer, wcount<<1);
}
}
/*
* This is used for most PIO data transfers *to* the IDE interface
*/
void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
{
byte io_32bit;
if(HWIF(drive)->ideproc) {
HWIF(drive)->ideproc(ideproc_ide_output_data,
drive, buffer, wcount);
return;
}
io_32bit = drive->io_32bit;
if (io_32bit) {
#if SUPPORT_VLB_SYNC
if (io_32bit & 2) {
unsigned long flags;
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
do_vlb_sync(IDE_NSECTOR_REG);
outsl(IDE_DATA_REG, buffer, wcount);
__restore_flags(flags); /* local CPU only */
} else
#endif /* SUPPORT_VLB_SYNC */
outsl(IDE_DATA_REG, buffer, wcount);
} else {
#if SUPPORT_SLOW_DATA_PORTS
if (drive->slow) {
unsigned short *ptr = (unsigned short *) buffer;
while (wcount--) {
outw_p(*ptr++, IDE_DATA_REG);
outw_p(*ptr++, IDE_DATA_REG);
}
} else
#endif /* SUPPORT_SLOW_DATA_PORTS */
outsw(IDE_DATA_REG, buffer, wcount<<1);
}
}
/*
* The following routines are mainly used by the ATAPI drivers.
*
* These routines will round up any request for an odd number of bytes,
* so if an odd bytecount is specified, be sure that there's at least one
* extra byte allocated for the buffer.
*/
void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
{
if(HWIF(drive)->ideproc) {
HWIF(drive)->ideproc(ideproc_atapi_input_bytes,
drive, buffer, bytecount);
return;
}
++bytecount;
#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
if (MACH_IS_ATARI || MACH_IS_Q40) {
/* Atari has a byte-swapped IDE interface */
insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
return;
}
#endif /* CONFIG_ATARI */
ide_input_data (drive, buffer, bytecount / 4);
if ((bytecount & 0x03) >= 2)
insw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
}
void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
{
if(HWIF(drive)->ideproc) {
HWIF(drive)->ideproc(ideproc_atapi_output_bytes,
drive, buffer, bytecount);
return;
}
++bytecount;
#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
if (MACH_IS_ATARI || MACH_IS_Q40) {
/* Atari has a byte-swapped IDE interface */
outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
return;
}
#endif /* CONFIG_ATARI */
ide_output_data (drive, buffer, bytecount / 4);
if ((bytecount & 0x03) >= 2)
outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
}
/*
* Needed for PCI irq sharing
*/
static inline int drive_is_ready (ide_drive_t *drive)
{
byte stat = 0;
if (drive->waiting_for_dma)
return HWIF(drive)->dmaproc(ide_dma_test_irq, drive);
#if 0
udelay(1); /* need to guarantee 400ns since last command was issued */
#endif
#ifdef CONFIG_IDEPCI_SHARE_IRQ
/*
* We do a passive status test under shared PCI interrupts on
* cards that truly share the ATA side interrupt, but may also share
* an interrupt with another pci card/device. We make no assumptions
* about possible isa-pnp and pci-pnp issues yet.
*/
if (IDE_CONTROL_REG)
stat = GET_ALTSTAT();
else
#endif /* CONFIG_IDEPCI_SHARE_IRQ */
stat = GET_STAT(); /* Note: this may clear a pending IRQ!! */
if (stat & BUSY_STAT)
return 0; /* drive busy: definitely not interrupting */
return 1; /* drive ready: *might* be interrupting */
}
/*
* This is our end_request replacement function.
*/
void ide_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
{
struct request *rq;
unsigned long flags;
ide_drive_t *drive = hwgroup->drive;
spin_lock_irqsave(&io_request_lock, flags);
rq = hwgroup->rq;
/*
* decide whether to reenable DMA -- 3 is a random magic for now,
* if we DMA timeout more than 3 times, just stay in PIO
*/
if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
drive->state = 0;
hwgroup->hwif->dmaproc(ide_dma_on, drive);
}
if (!end_that_request_first(rq, uptodate, hwgroup->drive->name)) {
add_blkdev_randomness(MAJOR(rq->rq_dev));
blkdev_dequeue_request(rq);
hwgroup->rq = NULL;
end_that_request_last(rq);
}
spin_unlock_irqrestore(&io_request_lock, flags);
}
/*
* This should get invoked any time we exit the driver to
* wait for an interrupt response from a drive. handler() points
* at the appropriate code to handle the next interrupt, and a
* timer is started to prevent us from waiting forever in case
* something goes wrong (see the ide_timer_expiry() handler later on).
*/
void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
unsigned int timeout, ide_expiry_t *expiry)
{
unsigned long flags;
ide_hwgroup_t *hwgroup = HWGROUP(drive);
spin_lock_irqsave(&io_request_lock, flags);
if (hwgroup->handler != NULL) {
printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
drive->name, hwgroup->handler, handler);
}
hwgroup->handler = handler;
hwgroup->expiry = expiry;
hwgroup->timer.expires = jiffies + timeout;
add_timer(&hwgroup->timer);
spin_unlock_irqrestore(&io_request_lock, flags);
}
/*
* current_capacity() returns the capacity (in sectors) of a drive
* according to its current geometry/LBA settings.
*/
unsigned long current_capacity (ide_drive_t *drive)
{
if (!drive->present)
return 0;
if (drive->driver != NULL)
return DRIVER(drive)->capacity(drive);
return 0;
}
extern struct block_device_operations ide_fops[];
/*
* ide_geninit() is called exactly *once* for each interface.
*/
void ide_geninit (ide_hwif_t *hwif)
{
unsigned int unit;
struct gendisk *gd = hwif->gd;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
if (!drive->present)
continue;
if (drive->media!=ide_disk && drive->media!=ide_floppy)
continue;
register_disk(gd,MKDEV(hwif->major,unit<<PARTN_BITS),
#ifdef CONFIG_BLK_DEV_ISAPNP
(drive->forced_geom && drive->noprobe) ? 1 :
#endif /* CONFIG_BLK_DEV_ISAPNP */
1<<PARTN_BITS, ide_fops,
current_capacity(drive));
}
}
static ide_startstop_t do_reset1 (ide_drive_t *, int); /* needed below */
/*
* atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
* during an atapi drive reset operation. If the drive has not yet responded,
* and we have not yet hit our maximum waiting time, then the timer is restarted
* for another 50ms.
*/
static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
byte stat;
SELECT_DRIVE(HWIF(drive),drive);
udelay (10);
if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
printk("%s: ATAPI reset complete\n", drive->name);
} else {
if (0 < (signed long)(hwgroup->poll_timeout - jiffies)) {
ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20, NULL);
return ide_started; /* continue polling */
}
hwgroup->poll_timeout = 0; /* end of polling */
printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
return do_reset1 (drive, 1); /* do it the old fashioned way */
}
hwgroup->poll_timeout = 0; /* done polling */
return ide_stopped;
}
/*
* reset_pollfunc() gets invoked to poll the interface for completion every 50ms
* during an ide reset operation. If the drives have not yet responded,
* and we have not yet hit our maximum waiting time, then the timer is restarted
* for another 50ms.
*/
static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
ide_hwif_t *hwif = HWIF(drive);
byte tmp;
if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
if (0 < (signed long)(hwgroup->poll_timeout - jiffies)) {
ide_set_handler (drive, &reset_pollfunc, HZ/20, NULL);
return ide_started; /* continue polling */
}
printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
drive->failures++;
} else {
printk("%s: reset: ", hwif->name);
if ((tmp = GET_ERR()) == 1) {
printk("success\n");
drive->failures = 0;
} else {
drive->failures++;
#if FANCY_STATUS_DUMPS
printk("master: ");
switch (tmp & 0x7f) {
case 1: printk("passed");
break;
case 2: printk("formatter device error");
break;
case 3: printk("sector buffer error");
break;
case 4: printk("ECC circuitry error");
break;
case 5: printk("controlling MPU error");
break;
default:printk("error (0x%02x?)", tmp);
}
if (tmp & 0x80)
printk("; slave: failed");
printk("\n");
#else
printk("failed\n");
#endif /* FANCY_STATUS_DUMPS */
}
}
hwgroup->poll_timeout = 0; /* done polling */
return ide_stopped;
}
static void check_dma_crc (ide_drive_t *drive)
{
if (drive->crc_count) {
(void) HWIF(drive)->dmaproc(ide_dma_off_quietly, drive);
if ((HWIF(drive)->speedproc) != NULL)
HWIF(drive)->speedproc(drive, ide_auto_reduce_xfer(drive));
if (drive->current_speed >= XFER_SW_DMA_0)
(void) HWIF(drive)->dmaproc(ide_dma_on, drive);
} else {
(void) HWIF(drive)->dmaproc(ide_dma_off, drive);
}
}
static void pre_reset (ide_drive_t *drive)
{
if (drive->driver != NULL)
DRIVER(drive)->pre_reset(drive);
if (!drive->keep_settings) {
if (drive->using_dma) {
check_dma_crc(drive);
} else {
drive->unmask = 0;
drive->io_32bit = 0;
}
return;
}
if (drive->using_dma)
check_dma_crc(drive);
}
/*
* do_reset1() attempts to recover a confused drive by resetting it.
* Unfortunately, resetting a disk drive actually resets all devices on
* the same interface, so it can really be thought of as resetting the
* interface rather than resetting the drive.
*
* ATAPI devices have their own reset mechanism which allows them to be
* individually reset without clobbering other devices on the same interface.
*
* Unfortunately, the IDE interface does not generate an interrupt to let
* us know when the reset operation has finished, so we must poll for this.
* Equally poor, though, is the fact that this may a very long time to complete,
* (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
* we set a timer to poll at 50ms intervals.
*/
static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
{
unsigned int unit;
unsigned long flags;
ide_hwif_t *hwif = HWIF(drive);
ide_hwgroup_t *hwgroup = HWGROUP(drive);
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
/* For an ATAPI device, first try an ATAPI SRST. */
if (drive->media != ide_disk && !do_not_try_atapi) {
pre_reset(drive);
SELECT_DRIVE(hwif,drive);
udelay (20);
OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20, NULL);
__restore_flags (flags); /* local CPU only */
return ide_started;
}
/*
* First, reset any device state data we were maintaining
* for any of the drives on this interface.
*/
for (unit = 0; unit < MAX_DRIVES; ++unit)
pre_reset(&hwif->drives[unit]);
#if OK_TO_RESET_CONTROLLER
if (!IDE_CONTROL_REG) {
__restore_flags(flags);
return ide_stopped;
}
/*
* Note that we also set nIEN while resetting the device,
* to mask unwanted interrupts from the interface during the reset.
* However, due to the design of PC hardware, this will cause an
* immediate interrupt due to the edge transition it produces.
* This single interrupt gives us a "fast poll" for drives that
* recover from reset very quickly, saving us the first 50ms wait time.
*/
OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
udelay(10); /* more than enough time */
OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
udelay(10); /* more than enough time */
hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
ide_set_handler (drive, &reset_pollfunc, HZ/20, NULL);
/*
* Some weird controller like resetting themselves to a strange
* state when the disks are reset this way. At least, the Winbond
* 553 documentation says that
*/
if (hwif->resetproc != NULL)
hwif->resetproc(drive);
#endif /* OK_TO_RESET_CONTROLLER */
__restore_flags (flags); /* local CPU only */
return ide_started;
}
/*
* ide_do_reset() is the entry point to the drive/interface reset code.
*/
ide_startstop_t ide_do_reset (ide_drive_t *drive)
{
return do_reset1 (drive, 0);
}
/*
* Clean up after success/failure of an explicit drive cmd
*/
void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
{
unsigned long flags;
struct request *rq;
spin_lock_irqsave(&io_request_lock, flags);
rq = HWGROUP(drive)->rq;
spin_unlock_irqrestore(&io_request_lock, flags);
if (rq->cmd == IDE_DRIVE_CMD) {
byte *args = (byte *) rq->buffer;
rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
if (args) {
args[0] = stat;
args[1] = err;
args[2] = IN_BYTE(IDE_NSECTOR_REG);
}
} else if (rq->cmd == IDE_DRIVE_TASK) {
byte *args = (byte *) rq->buffer;
rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
if (args) {
args[0] = stat;
args[1] = err;
args[2] = IN_BYTE(IDE_NSECTOR_REG);
args[3] = IN_BYTE(IDE_SECTOR_REG);
args[4] = IN_BYTE(IDE_LCYL_REG);
args[5] = IN_BYTE(IDE_HCYL_REG);
args[6] = IN_BYTE(IDE_SELECT_REG);
}
}
spin_lock_irqsave(&io_request_lock, flags);
blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
end_that_request_last(rq);
spin_unlock_irqrestore(&io_request_lock, flags);
}
/*
* Error reporting, in human readable form (luxurious, but a memory hog).
*/
byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
{
unsigned long flags;
byte err = 0;
__save_flags (flags); /* local CPU only */
ide__sti(); /* local CPU only */
printk("%s: %s: status=0x%02x", drive->name, msg, stat);
#if FANCY_STATUS_DUMPS
printk(" { ");
if (stat & BUSY_STAT)
printk("Busy ");
else {
if (stat & READY_STAT) printk("DriveReady ");
if (stat & WRERR_STAT) printk("DeviceFault ");
if (stat & SEEK_STAT) printk("SeekComplete ");
if (stat & DRQ_STAT) printk("DataRequest ");
if (stat & ECC_STAT) printk("CorrectedError ");
if (stat & INDEX_STAT) printk("Index ");
if (stat & ERR_STAT) printk("Error ");
}
printk("}");
#endif /* FANCY_STATUS_DUMPS */
printk("\n");
if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
err = GET_ERR();
printk("%s: %s: error=0x%02x", drive->name, msg, err);
#if FANCY_STATUS_DUMPS
if (drive->media == ide_disk) {
printk(" { ");
if (err & ABRT_ERR) printk("DriveStatusError ");
if (err & ICRC_ERR) printk("%s", (err & ABRT_ERR) ? "BadCRC " : "BadSector ");
if (err & ECC_ERR) printk("UncorrectableError ");
if (err & ID_ERR) printk("SectorIdNotFound ");
if (err & TRK0_ERR) printk("TrackZeroNotFound ");
if (err & MARK_ERR) printk("AddrMarkNotFound ");
printk("}");
if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR || (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
byte cur = IN_BYTE(IDE_SELECT_REG);
if (cur & 0x40) { /* using LBA? */
printk(", LBAsect=%ld", (unsigned long)
((cur&0xf)<<24)
|(IN_BYTE(IDE_HCYL_REG)<<16)
|(IN_BYTE(IDE_LCYL_REG)<<8)
| IN_BYTE(IDE_SECTOR_REG));
} else {
printk(", CHS=%d/%d/%d",
(IN_BYTE(IDE_HCYL_REG)<<8) +
IN_BYTE(IDE_LCYL_REG),
cur & 0xf,
IN_BYTE(IDE_SECTOR_REG));
}
if (HWGROUP(drive) && HWGROUP(drive)->rq)
printk(", sector=%ld", HWGROUP(drive)->rq->sector);
}
}
#endif /* FANCY_STATUS_DUMPS */
printk("\n");
}
__restore_flags (flags); /* local CPU only */
return err;
}
/*
* try_to_flush_leftover_data() is invoked in response to a drive
* unexpectedly having its DRQ_STAT bit set. As an alternative to
* resetting the drive, this routine tries to clear the condition
* by read a sector's worth of data from the drive. Of course,
* this may not help if the drive is *waiting* for data from *us*.
*/
static void try_to_flush_leftover_data (ide_drive_t *drive)
{
int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
if (drive->media != ide_disk)
return;
while (i > 0) {
u32 buffer[16];
unsigned int wcount = (i > 16) ? 16 : i;
i -= wcount;
ide_input_data (drive, buffer, wcount);
}
}
/*
* ide_error() takes action based on the error returned by the drive.
*/
ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat)
{
struct request *rq;
byte err;
err = ide_dump_status(drive, msg, stat);
if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
return ide_stopped;
/* retry only "normal" I/O: */
if (rq->cmd == IDE_DRIVE_CMD || rq->cmd == IDE_DRIVE_TASK) {
rq->errors = 1;
ide_end_drive_cmd(drive, stat, err);
return ide_stopped;
}
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { /* other bits are useless when BUSY */
rq->errors |= ERROR_RESET;
} else {
if (drive->media == ide_disk && (stat & ERR_STAT)) {
/* err has different meaning on cdrom and tape */
if (err == ABRT_ERR) {
if (drive->select.b.lba && IN_BYTE(IDE_COMMAND_REG) == WIN_SPECIFY)
return ide_stopped; /* some newer drives don't support WIN_SPECIFY */
} else if ((err & (ABRT_ERR | ICRC_ERR)) == (ABRT_ERR | ICRC_ERR)) {
drive->crc_count++; /* UDMA crc error -- just retry the operation */
} else if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
rq->errors = ERROR_MAX;
else if (err & TRK0_ERR) /* help it find track zero */
rq->errors |= ERROR_RECAL;
}
if ((stat & DRQ_STAT) && rq->cmd != WRITE)
try_to_flush_leftover_data(drive);
}
if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
OUT_BYTE(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); /* force an abort */
if (rq->errors >= ERROR_MAX) {
if (drive->driver != NULL)
DRIVER(drive)->end_request(0, HWGROUP(drive));
else
ide_end_request(0, HWGROUP(drive));
} else {
if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
++rq->errors;
return ide_do_reset(drive);
}
if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
drive->special.b.recalibrate = 1;
++rq->errors;
}
return ide_stopped;
}
/*
* Issue a simple drive command
* The drive must be selected beforehand.
*/
void ide_cmd (ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
{
ide_set_handler (drive, handler, WAIT_CMD, NULL);
if (IDE_CONTROL_REG)
OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */
SELECT_MASK(HWIF(drive),drive,0);
OUT_BYTE(nsect,IDE_NSECTOR_REG);
OUT_BYTE(cmd,IDE_COMMAND_REG);
}
/*
* drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
*/
static ide_startstop_t drive_cmd_intr (ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
byte *args = (byte *) rq->buffer;
byte stat = GET_STAT();
int retries = 10;
ide__sti(); /* local CPU only */
if ((stat & DRQ_STAT) && args && args[3]) {
byte io_32bit = drive->io_32bit;
drive->io_32bit = 0;
ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
drive->io_32bit = io_32bit;
while (((stat = GET_STAT()) & BUSY_STAT) && retries--)
udelay(100);
}
if (!OK_STAT(stat, READY_STAT, BAD_STAT))
return ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
ide_end_drive_cmd (drive, stat, GET_ERR());
return ide_stopped;
}
/*
* do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
* commands to a drive. It used to do much more, but has been scaled back.
*/
static ide_startstop_t do_special (ide_drive_t *drive)
{
special_t *s = &drive->special;
#ifdef DEBUG
printk("%s: do_special: 0x%02x\n", drive->name, s->all);
#endif
if (s->b.set_tune) {
ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
s->b.set_tune = 0;
if (tuneproc != NULL)
tuneproc(drive, drive->tune_req);
} else if (drive->driver != NULL) {
return DRIVER(drive)->special(drive);
} else if (s->all) {
printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
s->all = 0;
}
return ide_stopped;
}
/*
* This routine busy-waits for the drive status to be not "busy".
* It then checks the status for all of the "good" bits and none
* of the "bad" bits, and if all is okay it returns 0. All other
* cases return 1 after invoking ide_error() -- caller should just return.
*
* This routine should get fixed to not hog the cpu during extra long waits..
* That could be done by busy-waiting for the first jiffy or two, and then
* setting a timer to wake up at half second intervals thereafter,
* until timeout is achieved, before timing out.
*/
int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, byte good, byte bad, unsigned long timeout) {
byte stat;
int i;
unsigned long flags;
/* bail early if we've exceeded max_failures */
if (drive->max_failures && (drive->failures > drive->max_failures)) {
*startstop = ide_stopped;
return 1;
}
udelay(1); /* spec allows drive 400ns to assert "BUSY" */
if ((stat = GET_STAT()) & BUSY_STAT) {
__save_flags(flags); /* local CPU only */
ide__sti(); /* local CPU only */
timeout += jiffies;
while ((stat = GET_STAT()) & BUSY_STAT) {
if (0 < (signed long)(jiffies - timeout)) {
__restore_flags(flags); /* local CPU only */
*startstop = ide_error(drive, "status timeout", stat);
return 1;
}
}
__restore_flags(flags); /* local CPU only */
}
/*
* Allow status to settle, then read it again.
* A few rare drives vastly violate the 400ns spec here,
* so we'll wait up to 10usec for a "good" status
* rather than expensively fail things immediately.
* This fix courtesy of Matthew Faupel & Niccolo Rigacci.
*/
for (i = 0; i < 10; i++) {
udelay(1);
if (OK_STAT((stat = GET_STAT()), good, bad))
return 0;
}
*startstop = ide_error(drive, "status error", stat);
return 1;
}
/*
* execute_drive_cmd() issues a special drive command,
* usually initiated by ioctl() from the external hdparm program.
*/
static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, struct request *rq)
{
byte *args = rq->buffer;
if (args && rq->cmd == IDE_DRIVE_TASK) {
byte sel;
#ifdef DEBUG
printk("%s: DRIVE_TASK_CMD data=x%02x cmd=0x%02x fr=0x%02x ns=0x%02x sc=0x%02x lcyl=0x%02x hcyl=0x%02x sel=0x%02x\n",
drive->name,
args[0], args[1], args[2], args[3],
args[4], args[5], args[6], args[7]);
#endif
OUT_BYTE(args[1], IDE_FEATURE_REG);
OUT_BYTE(args[3], IDE_SECTOR_REG);
OUT_BYTE(args[4], IDE_LCYL_REG);
OUT_BYTE(args[5], IDE_HCYL_REG);
sel = (args[6] & ~0x10);
if (drive->select.b.unit)
sel |= 0x10;
OUT_BYTE(sel, IDE_SELECT_REG);
ide_cmd(drive, args[0], args[2], &drive_cmd_intr);
return ide_started;
} else if (args) {
#ifdef DEBUG
printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
drive->name, args[0], args[1], args[2], args[3]);
#endif
if (args[0] == WIN_SMART) {
OUT_BYTE(0x4f, IDE_LCYL_REG);
OUT_BYTE(0xc2, IDE_HCYL_REG);
OUT_BYTE(args[2],IDE_FEATURE_REG);
OUT_BYTE(args[1],IDE_SECTOR_REG);
ide_cmd(drive, args[0], args[3], &drive_cmd_intr);
return ide_started;
}
OUT_BYTE(args[2],IDE_FEATURE_REG);
ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
return ide_started;
} else {
/*
* NULL is actually a valid way of waiting for
* all current requests to be flushed from the queue.
*/
#ifdef DEBUG
printk("%s: DRIVE_CMD (null)\n", drive->name);
#endif
ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
return ide_stopped;
}
}
/*
* start_request() initiates handling of a new I/O request
*/
static ide_startstop_t start_request (ide_drive_t *drive)
{
ide_startstop_t startstop;
unsigned long block, blockend;
struct request *rq = blkdev_entry_next_request(&drive->queue.queue_head);
unsigned int minor = MINOR(rq->rq_dev), unit = minor >> PARTN_BITS;
ide_hwif_t *hwif = HWIF(drive);
#ifdef DEBUG
printk("%s: start_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
#endif
/* bail early if we've exceeded max_failures */
if (drive->max_failures && (drive->failures > drive->max_failures)) {
goto kill_rq;
}
if (unit >= MAX_DRIVES) {
printk("%s: bad device number: %s\n", hwif->name, kdevname(rq->rq_dev));
goto kill_rq;
}
#ifdef DEBUG
if (rq->bh && !buffer_locked(rq->bh)) {
printk("%s: block not locked\n", drive->name);
goto kill_rq;
}
#endif
block = rq->sector;
blockend = block + rq->nr_sectors;
if ((rq->cmd == READ || rq->cmd == WRITE) &&
(drive->media == ide_disk || drive->media == ide_floppy)) {
if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
(minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
goto kill_rq;
}
block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
}
/* Yecch - this will shift the entire interval,
possibly killing some innocent following sector */
if (block == 0 && drive->remap_0_to_1 == 1)
block = 1; /* redirect MBR access to EZ-Drive partn table */
#if (DISK_RECOVERY_TIME > 0)
while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
#endif
SELECT_DRIVE(hwif, drive);
if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
printk("%s: drive not ready for command\n", drive->name);
return startstop;
}
if (!drive->special.all) {
if (rq->cmd == IDE_DRIVE_CMD || rq->cmd == IDE_DRIVE_TASK) {
return execute_drive_cmd(drive, rq);
}
if (drive->driver != NULL) {
return (DRIVER(drive)->do_request(drive, rq, block));
}
printk("%s: media type %d not supported\n", drive->name, drive->media);
goto kill_rq;
}
return do_special(drive);
kill_rq:
if (drive->driver != NULL)
DRIVER(drive)->end_request(0, HWGROUP(drive));
else
ide_end_request(0, HWGROUP(drive));
return ide_stopped;
}
ide_startstop_t restart_request (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
unsigned long flags;
spin_lock_irqsave(&io_request_lock, flags);
hwgroup->handler = NULL;
del_timer(&hwgroup->timer);
spin_unlock_irqrestore(&io_request_lock, flags);
return start_request(drive);
}
/*
* ide_stall_queue() can be used by a drive to give excess bandwidth back
* to the hwgroup by sleeping for timeout jiffies.
*/
void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
{
if (timeout > WAIT_WORSTCASE)
timeout = WAIT_WORSTCASE;
drive->sleep = timeout + jiffies;
}
#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
/*
* choose_drive() selects the next drive which will be serviced.
*/
static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
{
ide_drive_t *drive, *best;
repeat:
best = NULL;
drive = hwgroup->drive;
do {
if (!list_empty(&drive->queue.queue_head) && (!drive->sleep || 0 <= (signed long)(jiffies - drive->sleep))) {
if (!best
|| (drive->sleep && (!best->sleep || 0 < (signed long)(best->sleep - drive->sleep)))
|| (!best->sleep && 0 < (signed long)(WAKEUP(best) - WAKEUP(drive))))
{
if( !drive->queue.plugged )
best = drive;
}
}
} while ((drive = drive->next) != hwgroup->drive);
if (best && best->nice1 && !best->sleep && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
long t = (signed long)(WAKEUP(best) - jiffies);
if (t >= WAIT_MIN_SLEEP) {
/*
* We *may* have some time to spare, but first let's see if
* someone can potentially benefit from our nice mood today..
*/
drive = best->next;
do {
if (!drive->sleep
&& 0 < (signed long)(WAKEUP(drive) - (jiffies - best->service_time))
&& 0 < (signed long)((jiffies + t) - WAKEUP(drive)))
{
ide_stall_queue(best, IDE_MIN(t, 10 * WAIT_MIN_SLEEP));
goto repeat;
}
} while ((drive = drive->next) != best);
}
}
return best;
}
/*
* Issue a new request to a drive from hwgroup
* Caller must have already done spin_lock_irqsave(&io_request_lock, ..);
*
* A hwgroup is a serialized group of IDE interfaces. Usually there is
* exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
* may have both interfaces in a single hwgroup to "serialize" access.
* Or possibly multiple ISA interfaces can share a common IRQ by being grouped
* together into one hwgroup for serialized access.
*
* Note also that several hwgroups can end up sharing a single IRQ,
* possibly along with many other devices. This is especially common in
* PCI-based systems with off-board IDE controller cards.
*
* The IDE driver uses the single global io_request_lock spinlock to protect
* access to the request queues, and to protect the hwgroup->busy flag.
*
* The first thread into the driver for a particular hwgroup sets the
* hwgroup->busy flag to indicate that this hwgroup is now active,
* and then initiates processing of the top request from the request queue.
*
* Other threads attempting entry notice the busy setting, and will simply
* queue their new requests and exit immediately. Note that hwgroup->busy
* remains set even when the driver is merely awaiting the next interrupt.
* Thus, the meaning is "this hwgroup is busy processing a request".
*
* When processing of a request completes, the completing thread or IRQ-handler
* will start the next request from the queue. If no more work remains,
* the driver will clear the hwgroup->busy flag and exit.
*
* The io_request_lock (spinlock) is used to protect all access to the
* hwgroup->busy flag, but is otherwise not needed for most processing in
* the driver. This makes the driver much more friendlier to shared IRQs
* than previous designs, while remaining 100% (?) SMP safe and capable.
*/
/* --BenH: made non-static as ide-pmac.c uses it to kick the hwgroup back
* into life on wakeup from machine sleep.
*/
void ide_do_request(ide_hwgroup_t *hwgroup, int masked_irq)
{
ide_drive_t *drive;
ide_hwif_t *hwif;
ide_startstop_t startstop;
ide_get_lock(&ide_lock, ide_intr, hwgroup); /* for atari only: POSSIBLY BROKEN HERE(?) */
__cli(); /* necessary paranoia: ensure IRQs are masked on local CPU */
while (!hwgroup->busy) {
hwgroup->busy = 1;
drive = choose_drive(hwgroup);
if (drive == NULL) {
unsigned long sleep = 0;
hwgroup->rq = NULL;
drive = hwgroup->drive;
do {
if (drive->sleep && (!sleep || 0 < (signed long)(sleep - drive->sleep)))
sleep = drive->sleep;
} while ((drive = drive->next) != hwgroup->drive);
if (sleep) {
/*
* Take a short snooze, and then wake up this hwgroup again.
* This gives other hwgroups on the same a chance to
* play fairly with us, just in case there are big differences
* in relative throughputs.. don't want to hog the cpu too much.
*/
if (0 < (signed long)(jiffies + WAIT_MIN_SLEEP - sleep))
sleep = jiffies + WAIT_MIN_SLEEP;
#if 1
if (timer_pending(&hwgroup->timer))
printk("ide_set_handler: timer already active\n");
#endif
hwgroup->sleeping = 1; /* so that ide_timer_expiry knows what to do */
mod_timer(&hwgroup->timer, sleep);
/* we purposely leave hwgroup->busy==1 while sleeping */
} else {
/* Ugly, but how can we sleep for the lock otherwise? perhaps from tq_disk? */
ide_release_lock(&ide_lock); /* for atari only */
hwgroup->busy = 0;
}
return; /* no more work for this hwgroup (for now) */
}
hwif = HWIF(drive);
if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif && hwif->io_ports[IDE_CONTROL_OFFSET]) {
/* set nIEN for previous hwif */
SELECT_INTERRUPT(hwif, drive);
}
hwgroup->hwif = hwif;
hwgroup->drive = drive;
drive->sleep = 0;
drive->service_start = jiffies;
if ( drive->queue.plugged ) /* paranoia */
printk("%s: Huh? nuking plugged queue\n", drive->name);
hwgroup->rq = blkdev_entry_next_request(&drive->queue.queue_head);
/*
* Some systems have trouble with IDE IRQs arriving while
* the driver is still setting things up. So, here we disable
* the IRQ used by this interface while the request is being started.
* This may look bad at first, but pretty much the same thing
* happens anyway when any interrupt comes in, IDE or otherwise
* -- the kernel masks the IRQ while it is being handled.
*/
if (masked_irq && hwif->irq != masked_irq)
disable_irq_nosync(hwif->irq);
spin_unlock(&io_request_lock);
ide__sti(); /* allow other IRQs while we start this request */
startstop = start_request(drive);
spin_lock_irq(&io_request_lock);
if (masked_irq && hwif->irq != masked_irq)
enable_irq(hwif->irq);
if (startstop == ide_stopped)
hwgroup->busy = 0;
}
}
/*
* ide_get_queue() returns the queue which corresponds to a given device.
*/
request_queue_t *ide_get_queue (kdev_t dev)
{
ide_hwif_t *hwif = (ide_hwif_t *)blk_dev[MAJOR(dev)].data;
return &hwif->drives[DEVICE_NR(dev) & 1].queue;
}
/*
* Passes the stuff to ide_do_request
*/
void do_ide_request(request_queue_t *q)
{
ide_do_request(q->queuedata, 0);
}
/*
* un-busy the hwgroup etc, and clear any pending DMA status. we want to
* retry the current request in pio mode instead of risking tossing it
* all away
*/
void ide_dma_timeout_retry(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct request *rq;
/*
* end current dma transaction
*/
(void) hwif->dmaproc(ide_dma_end, drive);
/*
* complain a little, later we might remove some of this verbosity
*/
printk("%s: timeout waiting for DMA\n", drive->name);
(void) hwif->dmaproc(ide_dma_timeout, drive);
/*
* disable dma for now, but remember that we did so because of
* a timeout -- we'll reenable after we finish this next request
* (or rather the first chunk of it) in pio.
*/
drive->retry_pio++;
drive->state = DMA_PIO_RETRY;
(void) hwif->dmaproc(ide_dma_off_quietly, drive);
/*
* un-busy drive etc (hwgroup->busy is cleared on return) and
* make sure request is sane
*/
rq = HWGROUP(drive)->rq;
HWGROUP(drive)->rq = NULL;
rq->errors = 0;
rq->sector = rq->bh->b_rsector;
rq->current_nr_sectors = rq->bh->b_size >> 9;
rq->buffer = rq->bh->b_data;
}
/*
* ide_timer_expiry() is our timeout function for all drive operations.
* But note that it can also be invoked as a result of a "sleep" operation
* triggered by the mod_timer() call in ide_do_request.
*/
void ide_timer_expiry (unsigned long data)
{
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
ide_handler_t *handler;
ide_expiry_t *expiry;
unsigned long flags;
unsigned long wait;
spin_lock_irqsave(&io_request_lock, flags);
del_timer(&hwgroup->timer);
if ((handler = hwgroup->handler) == NULL) {
/*
* Either a marginal timeout occurred
* (got the interrupt just as timer expired),
* or we were "sleeping" to give other devices a chance.
* Either way, we don't really want to complain about anything.
*/
if (hwgroup->sleeping) {
hwgroup->sleeping = 0;
hwgroup->busy = 0;
}
} else {
ide_drive_t *drive = hwgroup->drive;
if (!drive) {
printk("ide_timer_expiry: hwgroup->drive was NULL\n");
hwgroup->handler = NULL;
} else {
ide_hwif_t *hwif;
ide_startstop_t startstop;
if (!hwgroup->busy) {
hwgroup->busy = 1; /* paranoia */
printk("%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
}
if ((expiry = hwgroup->expiry) != NULL) {
/* continue */
if ((wait = expiry(drive)) != 0) {
/* reset timer */
hwgroup->timer.expires = jiffies + wait;
add_timer(&hwgroup->timer);
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
}
hwgroup->handler = NULL;
/*
* We need to simulate a real interrupt when invoking
* the handler() function, which means we need to globally
* mask the specific IRQ:
*/
spin_unlock(&io_request_lock);
hwif = HWIF(drive);
#if DISABLE_IRQ_NOSYNC
disable_irq_nosync(hwif->irq);
#else
disable_irq(hwif->irq); /* disable_irq_nosync ?? */
#endif /* DISABLE_IRQ_NOSYNC */
__cli(); /* local CPU only, as if we were handling an interrupt */
if (hwgroup->poll_timeout != 0) {
startstop = handler(drive);
} else if (drive_is_ready(drive)) {
if (drive->waiting_for_dma)
(void) hwgroup->hwif->dmaproc(ide_dma_lostirq, drive);
(void)ide_ack_intr(hwif);
printk("%s: lost interrupt\n", drive->name);
startstop = handler(drive);
} else {
if (drive->waiting_for_dma) {
startstop = ide_stopped;
ide_dma_timeout_retry(drive);
} else
startstop = ide_error(drive, "irq timeout", GET_STAT());
}
set_recovery_timer(hwif);
drive->service_time = jiffies - drive->service_start;
enable_irq(hwif->irq);
spin_lock_irq(&io_request_lock);
if (startstop == ide_stopped)
hwgroup->busy = 0;
}
}
ide_do_request(hwgroup, 0);
spin_unlock_irqrestore(&io_request_lock, flags);
}
/*
* There's nothing really useful we can do with an unexpected interrupt,
* other than reading the status register (to clear it), and logging it.
* There should be no way that an irq can happen before we're ready for it,
* so we needn't worry much about losing an "important" interrupt here.
*
* On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
* drive enters "idle", "standby", or "sleep" mode, so if the status looks
* "good", we just ignore the interrupt completely.
*
* This routine assumes __cli() is in effect when called.
*
* If an unexpected interrupt happens on irq15 while we are handling irq14
* and if the two interfaces are "serialized" (CMD640), then it looks like
* we could screw up by interfering with a new request being set up for irq15.
*
* In reality, this is a non-issue. The new command is not sent unless the
* drive is ready to accept one, in which case we know the drive is not
* trying to interrupt us. And ide_set_handler() is always invoked before
* completing the issuance of any new drive command, so we will not be
* accidently invoked as a result of any valid command completion interrupt.
*
*/
static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
{
byte stat;
ide_hwif_t *hwif = hwgroup->hwif;
/*
* handle the unexpected interrupt
*/
do {
if (hwif->irq == irq) {
stat = IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
/* Try to not flood the console with msgs */
static unsigned long last_msgtime, count;
++count;
if (0 < (signed long)(jiffies - (last_msgtime + HZ))) {
last_msgtime = jiffies;
printk("%s%s: unexpected interrupt, status=0x%02x, count=%ld\n",
hwif->name, (hwif->next == hwgroup->hwif) ? "" : "(?)", stat, count);
}
}
}
} while ((hwif = hwif->next) != hwgroup->hwif);
}
/*
* entry point for all interrupts, caller does __cli() for us
*/
void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long flags;
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
ide_hwif_t *hwif;
ide_drive_t *drive;
ide_handler_t *handler;
ide_startstop_t startstop;
spin_lock_irqsave(&io_request_lock, flags);
hwif = hwgroup->hwif;
if (!ide_ack_intr(hwif)) {
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
if ((handler = hwgroup->handler) == NULL || hwgroup->poll_timeout != 0) {
/*
* Not expecting an interrupt from this drive.
* That means this could be:
* (1) an interrupt from another PCI device
* sharing the same PCI INT# as us.
* or (2) a drive just entered sleep or standby mode,
* and is interrupting to let us know.
* or (3) a spurious interrupt of unknown origin.
*
* For PCI, we cannot tell the difference,
* so in that case we just ignore it and hope it goes away.
*/
#ifdef CONFIG_BLK_DEV_IDEPCI
if (IDE_PCI_DEVID_EQ(hwif->pci_devid, IDE_PCI_DEVID_NULL))
#endif /* CONFIG_BLK_DEV_IDEPCI */
{
/*
* Probably not a shared PCI interrupt,
* so we can safely try to do something about it:
*/
unexpected_intr(irq, hwgroup);
#ifdef CONFIG_BLK_DEV_IDEPCI
} else {
/*
* Whack the status register, just in case we have a leftover pending IRQ.
*/
(void) IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
#endif /* CONFIG_BLK_DEV_IDEPCI */
}
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
drive = hwgroup->drive;
if (!drive) {
/*
* This should NEVER happen, and there isn't much we could do about it here.
*/
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
if (!drive_is_ready(drive)) {
/*
* This happens regularly when we share a PCI IRQ with another device.
* Unfortunately, it can also happen with some buggy drives that trigger
* the IRQ before their status register is up to date. Hopefully we have
* enough advance overhead that the latter isn't a problem.
*/
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
if (!hwgroup->busy) {
hwgroup->busy = 1; /* paranoia */
printk("%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
}
hwgroup->handler = NULL;
del_timer(&hwgroup->timer);
spin_unlock(&io_request_lock);
if (drive->unmask)
ide__sti(); /* local CPU only */
startstop = handler(drive); /* service this interrupt, may set handler for next interrupt */
spin_lock_irq(&io_request_lock);
/*
* Note that handler() may have set things up for another
* interrupt to occur soon, but it cannot happen until
* we exit from this routine, because it will be the
* same irq as is currently being serviced here, and Linux
* won't allow another of the same (on any CPU) until we return.
*/
set_recovery_timer(HWIF(drive));
drive->service_time = jiffies - drive->service_start;
if (startstop == ide_stopped) {
if (hwgroup->handler == NULL) { /* paranoia */
hwgroup->busy = 0;
ide_do_request(hwgroup, hwif->irq);
} else {
printk("%s: ide_intr: huh? expected NULL handler on exit\n", drive->name);
}
}
spin_unlock_irqrestore(&io_request_lock, flags);
}
/*
* get_info_ptr() returns the (ide_drive_t *) for a given device number.
* It returns NULL if the given device number does not match any present drives.
*/
ide_drive_t *get_info_ptr (kdev_t i_rdev)
{
int major = MAJOR(i_rdev);
#if 0
int minor = MINOR(i_rdev) & PARTN_MASK;
#endif
unsigned int h;
for (h = 0; h < MAX_HWIFS; ++h) {
ide_hwif_t *hwif = &ide_hwifs[h];
if (hwif->present && major == hwif->major) {
unsigned unit = DEVICE_NR(i_rdev);
if (unit < MAX_DRIVES) {
ide_drive_t *drive = &hwif->drives[unit];
#if 0
if ((drive->present) && (drive->part[minor].nr_sects))
#else
if (drive->present)
#endif
return drive;
}
break;
}
}
return NULL;
}
/*
* This function is intended to be used prior to invoking ide_do_drive_cmd().
*/
void ide_init_drive_cmd (struct request *rq)
{
memset(rq, 0, sizeof(*rq));
rq->cmd = IDE_DRIVE_CMD;
}
/*
* This function issues a special IDE device request
* onto the request queue.
*
* If action is ide_wait, then the rq is queued at the end of the
* request queue, and the function sleeps until it has been processed.
* This is for use when invoked from an ioctl handler.
*
* If action is ide_preempt, then the rq is queued at the head of
* the request queue, displacing the currently-being-processed
* request and this function returns immediately without waiting
* for the new rq to be completed. This is VERY DANGEROUS, and is
* intended for careful use by the ATAPI tape/cdrom driver code.
*
* If action is ide_next, then the rq is queued immediately after
* the currently-being-processed-request (if any), and the function
* returns without waiting for the new rq to be completed. As above,
* This is VERY DANGEROUS, and is intended for careful use by the
* ATAPI tape/cdrom driver code.
*
* If action is ide_end, then the rq is queued at the end of the
* request queue, and the function returns immediately without waiting
* for the new rq to be completed. This is again intended for careful
* use by the ATAPI tape/cdrom driver code.
*/
int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
{
unsigned long flags;
ide_hwgroup_t *hwgroup = HWGROUP(drive);
unsigned int major = HWIF(drive)->major;
struct list_head *queue_head = &drive->queue.queue_head;
DECLARE_COMPLETION(wait);
#ifdef CONFIG_BLK_DEV_PDC4030
if (HWIF(drive)->chipset == ide_pdc4030 && rq->buffer != NULL)
return -ENOSYS; /* special drive cmds not supported */
#endif
rq->errors = 0;
rq->rq_status = RQ_ACTIVE;
rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
if (action == ide_wait)
rq->waiting = &wait;
spin_lock_irqsave(&io_request_lock, flags);
if (list_empty(queue_head) || action == ide_preempt) {
if (action == ide_preempt)
hwgroup->rq = NULL;
} else {
if (action == ide_wait || action == ide_end) {
queue_head = queue_head->prev;
} else
queue_head = queue_head->next;
}
list_add(&rq->queue, queue_head);
ide_do_request(hwgroup, 0);
spin_unlock_irqrestore(&io_request_lock, flags);
if (action == ide_wait) {
wait_for_completion(&wait); /* wait for it to be serviced */
return rq->errors ? -EIO : 0; /* return -EIO if errors */
}
return 0;
}
/*
* This routine is called to flush all partitions and partition tables
* for a changed disk, and then re-read the new partition table.
* If we are revalidating a disk because of a media change, then we
* enter with usage == 0. If we are using an ioctl, we automatically have
* usage == 1 (we need an open channel to use an ioctl :-), so this
* is our limit.
*/
int ide_revalidate_disk (kdev_t i_rdev)
{
ide_drive_t *drive;
ide_hwgroup_t *hwgroup;
unsigned int p, major, minor;
long flags;
if ((drive = get_info_ptr(i_rdev)) == NULL)
return -ENODEV;
major = MAJOR(i_rdev);
minor = drive->select.b.unit << PARTN_BITS;
hwgroup = HWGROUP(drive);
spin_lock_irqsave(&io_request_lock, flags);
if (drive->busy || (drive->usage > 1)) {
spin_unlock_irqrestore(&io_request_lock, flags);
return -EBUSY;
};
drive->busy = 1;
MOD_INC_USE_COUNT;
spin_unlock_irqrestore(&io_request_lock, flags);
for (p = 0; p < (1<<PARTN_BITS); ++p) {
if (drive->part[p].nr_sects > 0) {
kdev_t devp = MKDEV(major, minor+p);
invalidate_device(devp, 1);
}
drive->part[p].start_sect = 0;
drive->part[p].nr_sects = 0;
};
if (DRIVER(drive)->revalidate)
DRIVER(drive)->revalidate(drive);
drive->busy = 0;
wake_up(&drive->wqueue);
MOD_DEC_USE_COUNT;
return 0;
}
static void revalidate_drives (void)
{
ide_hwif_t *hwif;
ide_drive_t *drive;
int index, unit;
for (index = 0; index < MAX_HWIFS; ++index) {
hwif = &ide_hwifs[index];
for (unit = 0; unit < MAX_DRIVES; ++unit) {
drive = &ide_hwifs[index].drives[unit];
if (drive->revalidate) {
drive->revalidate = 0;
if (!initializing)
(void) ide_revalidate_disk(MKDEV(hwif->major, unit<<PARTN_BITS));
}
}
}
}
static void ide_probe_module (void)
{
if (!ide_probe) {
#if defined(CONFIG_KMOD) && defined(CONFIG_BLK_DEV_IDE_MODULE)
(void) request_module("ide-probe-mod");
#endif /* (CONFIG_KMOD) && (CONFIG_BLK_DEV_IDE_MODULE) */
} else {
(void) ide_probe->init();
}
revalidate_drives();
}
static void ide_driver_module (void)
{
int index;
ide_module_t *module = ide_modules;
for (index = 0; index < MAX_HWIFS; ++index)
if (ide_hwifs[index].present)
goto search;
ide_probe_module();
search:
while (module) {
(void) module->init();
module = module->next;
}
revalidate_drives();
}
static int ide_open (struct inode * inode, struct file * filp)
{
ide_drive_t *drive;
if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
return -ENXIO;
if (drive->driver == NULL)
ide_driver_module();
#ifdef CONFIG_KMOD
if (drive->driver == NULL) {
if (drive->media == ide_disk)
(void) request_module("ide-disk");
if (drive->media == ide_cdrom)
(void) request_module("ide-cd");
if (drive->media == ide_tape)
(void) request_module("ide-tape");
if (drive->media == ide_floppy)
(void) request_module("ide-floppy");
}
#endif /* CONFIG_KMOD */
while (drive->busy)
sleep_on(&drive->wqueue);
drive->usage++;
if (drive->driver != NULL)
return DRIVER(drive)->open(inode, filp, drive);
printk ("%s: driver not present\n", drive->name);
drive->usage--;
return -ENXIO;
}
/*
* Releasing a block device means we sync() it, so that it can safely
* be forgotten about...
*/
static int ide_release (struct inode * inode, struct file * file)
{
ide_drive_t *drive;
if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
drive->usage--;
if (drive->driver != NULL)
DRIVER(drive)->release(inode, file, drive);
}
return 0;
}
int ide_replace_subdriver (ide_drive_t *drive, const char *driver)
{
if (!drive->present || drive->busy || drive->usage)
goto abort;
if (drive->driver != NULL && DRIVER(drive)->cleanup(drive))
goto abort;
strncpy(drive->driver_req, driver, 9);
ide_driver_module();
drive->driver_req[0] = 0;
ide_driver_module();
if (DRIVER(drive) && !strcmp(DRIVER(drive)->name, driver))
return 0;
abort:
return 1;
}
#ifdef CONFIG_PROC_FS
ide_proc_entry_t generic_subdriver_entries[] = {
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
{ NULL, 0, NULL, NULL }
};
#endif
/*
* Note that we only release the standard ports,
* and do not even try to handle any extra ports
* allocated for weird IDE interface chipsets.
*/
void hwif_unregister (ide_hwif_t *hwif)
{
if (hwif->straight8) {
ide_release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
goto jump_eight;
}
if (hwif->io_ports[IDE_DATA_OFFSET])
ide_release_region(hwif->io_ports[IDE_DATA_OFFSET], 1);
if (hwif->io_ports[IDE_ERROR_OFFSET])
ide_release_region(hwif->io_ports[IDE_ERROR_OFFSET], 1);
if (hwif->io_ports[IDE_NSECTOR_OFFSET])
ide_release_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1);
if (hwif->io_ports[IDE_SECTOR_OFFSET])
ide_release_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1);
if (hwif->io_ports[IDE_LCYL_OFFSET])
ide_release_region(hwif->io_ports[IDE_LCYL_OFFSET], 1);
if (hwif->io_ports[IDE_HCYL_OFFSET])
ide_release_region(hwif->io_ports[IDE_HCYL_OFFSET], 1);
if (hwif->io_ports[IDE_SELECT_OFFSET])
ide_release_region(hwif->io_ports[IDE_SELECT_OFFSET], 1);
if (hwif->io_ports[IDE_STATUS_OFFSET])
ide_release_region(hwif->io_ports[IDE_STATUS_OFFSET], 1);
jump_eight:
if (hwif->io_ports[IDE_CONTROL_OFFSET])
ide_release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
#if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
if (hwif->io_ports[IDE_IRQ_OFFSET])
ide_release_region(hwif->io_ports[IDE_IRQ_OFFSET], 1);
#endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
}
void ide_unregister (unsigned int index)
{
struct gendisk *gd;
ide_drive_t *drive, *d;
ide_hwif_t *hwif, *g;
ide_hwgroup_t *hwgroup;
int irq_count = 0, unit, i;
unsigned long flags;
unsigned int p, minor;
ide_hwif_t old_hwif;
if (index >= MAX_HWIFS)
return;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
hwif = &ide_hwifs[index];
if (!hwif->present)
goto abort;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
drive = &hwif->drives[unit];
if (!drive->present)
continue;
if (drive->busy || drive->usage)
goto abort;
if (drive->driver != NULL && DRIVER(drive)->cleanup(drive))
goto abort;
}
hwif->present = 0;
/*
* All clear? Then blow away the buffer cache
*/
sti();
for (unit = 0; unit < MAX_DRIVES; ++unit) {
drive = &hwif->drives[unit];
if (!drive->present)
continue;
minor = drive->select.b.unit << PARTN_BITS;
for (p = 0; p < (1<<PARTN_BITS); ++p) {
if (drive->part[p].nr_sects > 0) {
kdev_t devp = MKDEV(hwif->major, minor+p);
invalidate_device(devp, 0);
}
}
#ifdef CONFIG_PROC_FS
destroy_proc_ide_drives(hwif);
#endif
}
cli();
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);
/*
* Note that we only release the standard ports,
* and do not even try to handle any extra ports
* allocated for weird IDE interface chipsets.
*/
hwif_unregister(hwif);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
d = hwgroup->drive;
for (i = 0; i < MAX_DRIVES; ++i) {
drive = &hwif->drives[i];
if (drive->de) {
devfs_unregister (drive->de);
drive->de = NULL;
}
if (!drive->present)
continue;
while (hwgroup->drive->next != drive)
hwgroup->drive = hwgroup->drive->next;
hwgroup->drive->next = drive->next;
if (hwgroup->drive == drive)
hwgroup->drive = NULL;
if (drive->id != NULL) {
kfree(drive->id);
drive->id = NULL;
}
drive->present = 0;
blk_cleanup_queue(&drive->queue);
}
if (d->present)
hwgroup->drive = d;
while (hwgroup->hwif->next != hwif)
hwgroup->hwif = hwgroup->hwif->next;
hwgroup->hwif->next = hwif->next;
if (hwgroup->hwif == hwif)
kfree(hwgroup);
else
hwgroup->hwif = HWIF(hwgroup->drive);
#if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
if (hwif->dma_base) {
(void) ide_release_dma(hwif);
hwif->dma_base = 0;
}
#endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
/*
* Remove us from the kernel's knowledge
*/
unregister_blkdev(hwif->major, hwif->name);
kfree(blksize_size[hwif->major]);
kfree(max_sectors[hwif->major]);
kfree(max_readahead[hwif->major]);
blk_dev[hwif->major].data = NULL;
blk_dev[hwif->major].queue = NULL;
blksize_size[hwif->major] = NULL;
gd = hwif->gd;
if (gd) {
del_gendisk(gd);
kfree(gd->sizes);
kfree(gd->part);
if (gd->de_arr)
kfree (gd->de_arr);
if (gd->flags)
kfree (gd->flags);
kfree(gd);
hwif->gd = NULL;
}
old_hwif = *hwif;
init_hwif_data (index); /* restore hwif data to pristine status */
hwif->hwgroup = old_hwif.hwgroup;
hwif->tuneproc = old_hwif.tuneproc;
hwif->speedproc = old_hwif.speedproc;
hwif->selectproc = old_hwif.selectproc;
hwif->resetproc = old_hwif.resetproc;
hwif->intrproc = old_hwif.intrproc;
hwif->maskproc = old_hwif.maskproc;
hwif->quirkproc = old_hwif.quirkproc;
hwif->rwproc = old_hwif.rwproc;
hwif->ideproc = old_hwif.ideproc;
hwif->dmaproc = old_hwif.dmaproc;
hwif->busproc = old_hwif.busproc;
hwif->bus_state = old_hwif.bus_state;
hwif->dma_base = old_hwif.dma_base;
hwif->dma_extra = old_hwif.dma_extra;
hwif->config_data = old_hwif.config_data;
hwif->select_data = old_hwif.select_data;
hwif->proc = old_hwif.proc;
#ifndef CONFIG_BLK_DEV_IDECS
hwif->irq = old_hwif.irq;
#endif /* CONFIG_BLK_DEV_IDECS */
hwif->major = old_hwif.major;
hwif->chipset = old_hwif.chipset;
hwif->autodma = old_hwif.autodma;
hwif->udma_four = old_hwif.udma_four;
#ifdef CONFIG_BLK_DEV_IDEPCI
hwif->pci_dev = old_hwif.pci_dev;
hwif->pci_devid = old_hwif.pci_devid;
#endif /* CONFIG_BLK_DEV_IDEPCI */
hwif->straight8 = old_hwif.straight8;
hwif->hwif_data = old_hwif.hwif_data;
abort:
restore_flags(flags); /* all CPUs */
}
/*
* Setup hw_regs_t structure described by parameters. You
* may set up the hw structure yourself OR use this routine to
* do it for you.
*/
void ide_setup_ports ( hw_regs_t *hw,
ide_ioreg_t base, int *offsets,
ide_ioreg_t ctrl, ide_ioreg_t intr,
ide_ack_intr_t *ack_intr, int irq)
{
int i;
for (i = 0; i < IDE_NR_PORTS; i++) {
if (offsets[i] == -1) {
switch(i) {
case IDE_CONTROL_OFFSET:
hw->io_ports[i] = ctrl;
break;
#if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
case IDE_IRQ_OFFSET:
hw->io_ports[i] = intr;
break;
#endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
default:
hw->io_ports[i] = 0;
break;
}
} else {
hw->io_ports[i] = base + offsets[i];
}
}
hw->irq = irq;
hw->dma = NO_DMA;
hw->ack_intr = ack_intr;
}
/*
* Register an IDE interface, specifing exactly the registers etc
* Set init=1 iff calling before probes have taken place.
*/
int ide_register_hw (hw_regs_t *hw, ide_hwif_t **hwifp)
{
int index, retry = 1;
ide_hwif_t *hwif;
do {
for (index = 0; index < MAX_HWIFS; ++index) {
hwif = &ide_hwifs[index];
if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
goto found;
}
for (index = 0; index < MAX_HWIFS; ++index) {
hwif = &ide_hwifs[index];
if ((!hwif->present && !hwif->mate && !initializing) ||
(!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
goto found;
}
for (index = 0; index < MAX_HWIFS; index++)
ide_unregister(index);
} while (retry--);
return -1;
found:
if (hwif->present)
ide_unregister(index);
if (hwif->present)
return -1;
memcpy(&hwif->hw, hw, sizeof(*hw));
memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
hwif->irq = hw->irq;
hwif->noprobe = 0;
if (!initializing) {
ide_probe_module();
#ifdef CONFIG_PROC_FS
create_proc_ide_interfaces();
#endif
ide_driver_module();
}
if (hwifp)
*hwifp = hwif;
return (initializing || hwif->present) ? index : -1;
}
/*
* Compatability function with existing drivers. If you want
* something different, use the function above.
*/
int ide_register (int arg1, int arg2, int irq)
{
hw_regs_t hw;
ide_init_hwif_ports(&hw, (ide_ioreg_t) arg1, (ide_ioreg_t) arg2, NULL);
hw.irq = irq;
return ide_register_hw(&hw, NULL);
}
void ide_add_setting (ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
{
ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
while ((*p) && strcmp((*p)->name, name) < 0)
p = &((*p)->next);
if ((setting = kmalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
goto abort;
memset(setting, 0, sizeof(*setting));
if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
goto abort;
strcpy(setting->name, name); setting->rw = rw;
setting->read_ioctl = read_ioctl; setting->write_ioctl = write_ioctl;
setting->data_type = data_type; setting->min = min;
setting->max = max; setting->mul_factor = mul_factor;
setting->div_factor = div_factor; setting->data = data;
setting->set = set; setting->next = *p;
if (drive->driver)
setting->auto_remove = 1;
*p = setting;
return;
abort:
if (setting)
kfree(setting);
}
void ide_remove_setting (ide_drive_t *drive, char *name)
{
ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting;
while ((*p) && strcmp((*p)->name, name))
p = &((*p)->next);
if ((setting = (*p)) == NULL)
return;
(*p) = setting->next;
kfree(setting->name);
kfree(setting);
}
static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
{
ide_settings_t *setting = drive->settings;
while (setting) {
if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
break;
setting = setting->next;
}
return setting;
}
ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
{
ide_settings_t *setting = drive->settings;
while (setting) {
if (strcmp(setting->name, name) == 0)
break;
setting = setting->next;
}
return setting;
}
static void auto_remove_settings (ide_drive_t *drive)
{
ide_settings_t *setting;
repeat:
setting = drive->settings;
while (setting) {
if (setting->auto_remove) {
ide_remove_setting(drive, setting->name);
goto repeat;
}
setting = setting->next;
}
}
int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
{
int val = -EINVAL;
unsigned long flags;
if ((setting->rw & SETTING_READ)) {
spin_lock_irqsave(&io_request_lock, flags);
switch(setting->data_type) {
case TYPE_BYTE:
val = *((u8 *) setting->data);
break;
case TYPE_SHORT:
val = *((u16 *) setting->data);
break;
case TYPE_INT:
case TYPE_INTA:
val = *((u32 *) setting->data);
break;
}
spin_unlock_irqrestore(&io_request_lock, flags);
}
return val;
}
int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = HWGROUP(drive);
unsigned long timeout = jiffies + (3 * HZ);
spin_lock_irq(&io_request_lock);
while (hwgroup->busy) {
unsigned long lflags;
spin_unlock_irq(&io_request_lock);
__save_flags(lflags); /* local CPU only */
__sti(); /* local CPU only; needed for jiffies */
if (0 < (signed long)(jiffies - timeout)) {
__restore_flags(lflags); /* local CPU only */
printk("%s: channel busy\n", drive->name);
return -EBUSY;
}
__restore_flags(lflags); /* local CPU only */
spin_lock_irq(&io_request_lock);
}
return 0;
}
/*
* FIXME: This should be changed to enqueue a special request
* to the driver to change settings, and then wait on a sema for completion.
* The current scheme of polling is kludgey, though safe enough.
*/
int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
{
int i;
u32 *p;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!(setting->rw & SETTING_WRITE))
return -EPERM;
if (val < setting->min || val > setting->max)
return -EINVAL;
if (setting->set)
return setting->set(drive, val);
if (ide_spin_wait_hwgroup(drive))
return -EBUSY;
switch (setting->data_type) {
case TYPE_BYTE:
*((u8 *) setting->data) = val;
break;
case TYPE_SHORT:
*((u16 *) setting->data) = val;
break;
case TYPE_INT:
*((u32 *) setting->data) = val;
break;
case TYPE_INTA:
p = (u32 *) setting->data;
for (i = 0; i < 1 << PARTN_BITS; i++, p++)
*p = val;
break;
}
spin_unlock_irq(&io_request_lock);
return 0;
}
static int set_io_32bit(ide_drive_t *drive, int arg)
{
drive->io_32bit = arg;
#ifdef CONFIG_BLK_DEV_DTC2278
if (HWIF(drive)->chipset == ide_dtc2278)
HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
#endif /* CONFIG_BLK_DEV_DTC2278 */
return 0;
}
static int set_using_dma (ide_drive_t *drive, int arg)
{
if (!drive->driver || !DRIVER(drive)->supports_dma)
return -EPERM;
if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
return -EPERM;
if (HWIF(drive)->dmaproc(arg ? ide_dma_on : ide_dma_off, drive))
return -EIO;
return 0;
}
static int set_pio_mode (ide_drive_t *drive, int arg)
{
struct request rq;
if (!HWIF(drive)->tuneproc)
return -ENOSYS;
if (drive->special.b.set_tune)
return -EBUSY;
ide_init_drive_cmd(&rq);
drive->tune_req = (byte) arg;
drive->special.b.set_tune = 1;
(void) ide_do_drive_cmd (drive, &rq, ide_wait);
return 0;
}
void ide_add_generic_settings (ide_drive_t *drive)
{
/*
* drive setting name read/write access read ioctl write ioctl data type min max mul_factor div_factor data pointer set function
*/
ide_add_setting(drive, "io_32bit", drive->no_io_32bit ? SETTING_READ : SETTING_RW, HDIO_GET_32BIT, HDIO_SET_32BIT, TYPE_BYTE, 0, 1 + (SUPPORT_VLB_SYNC << 1), 1, 1, &drive->io_32bit, set_io_32bit);
ide_add_setting(drive, "keepsettings", SETTING_RW, HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, TYPE_BYTE, 0, 1, 1, 1, &drive->keep_settings, NULL);
ide_add_setting(drive, "nice1", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->nice1, NULL);
ide_add_setting(drive, "pio_mode", SETTING_WRITE, -1, HDIO_SET_PIO_MODE, TYPE_BYTE, 0, 255, 1, 1, NULL, set_pio_mode);
ide_add_setting(drive, "slow", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->slow, NULL);
ide_add_setting(drive, "unmaskirq", drive->no_unmask ? SETTING_READ : SETTING_RW, HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, TYPE_BYTE, 0, 1, 1, 1, &drive->unmask, NULL);
ide_add_setting(drive, "using_dma", SETTING_RW, HDIO_GET_DMA, HDIO_SET_DMA, TYPE_BYTE, 0, 1, 1, 1, &drive->using_dma, set_using_dma);
ide_add_setting(drive, "ide_scsi", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->scsi, NULL);
ide_add_setting(drive, "init_speed", SETTING_RW, -1, -1, TYPE_BYTE, 0, 69, 1, 1, &drive->init_speed, NULL);
ide_add_setting(drive, "current_speed", SETTING_RW, -1, -1, TYPE_BYTE, 0, 69, 1, 1, &drive->current_speed, NULL);
ide_add_setting(drive, "number", SETTING_RW, -1, -1, TYPE_BYTE, 0, 3, 1, 1, &drive->dn, NULL);
}
int ide_wait_cmd (ide_drive_t *drive, int cmd, int nsect, int feature, int sectors, byte *buf)
{
struct request rq;
byte buffer[4];
if (!buf)
buf = buffer;
memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
ide_init_drive_cmd(&rq);
rq.buffer = buf;
*buf++ = cmd;
*buf++ = nsect;
*buf++ = feature;
*buf++ = sectors;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
int ide_wait_cmd_task (ide_drive_t *drive, byte *buf)
{
struct request rq;
ide_init_drive_cmd(&rq);
rq.cmd = IDE_DRIVE_TASK;
rq.buffer = buf;
return ide_do_drive_cmd(drive, &rq, ide_wait);
}
/*
* Delay for *at least* 50ms. As we don't know how much time is left
* until the next tick occurs, we wait an extra tick to be safe.
* This is used only during the probing/polling for drives at boot time.
*
* However, its usefullness may be needed in other places, thus we export it now.
* The future may change this to a millisecond setable delay.
*/
void ide_delay_50ms (void)
{
#ifndef CONFIG_BLK_DEV_IDECS
mdelay(50);
#else
__set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/20);
#endif /* CONFIG_BLK_DEV_IDECS */
}
int system_bus_clock (void)
{
return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
}
static int ide_ioctl (struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0, major, minor;
ide_drive_t *drive;
struct request rq;
kdev_t dev;
ide_settings_t *setting;
if (!inode || !(dev = inode->i_rdev))
return -EINVAL;
major = MAJOR(dev); minor = MINOR(dev);
if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
return -ENODEV;
if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
if (cmd == setting->read_ioctl) {
err = ide_read_setting(drive, setting);
return err >= 0 ? put_user(err, (long *) arg) : err;
} else {
if ((MINOR(inode->i_rdev) & PARTN_MASK))
return -EINVAL;
return ide_write_setting(drive, setting, arg);
}
}
ide_init_drive_cmd (&rq);
switch (cmd) {
case HDIO_GETGEO:
{
struct hd_geometry *loc = (struct hd_geometry *) arg;
unsigned short bios_cyl = drive->bios_cyl; /* truncate */
if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
if (put_user(drive->bios_head, (byte *) &loc->heads)) return -EFAULT;
if (put_user(drive->bios_sect, (byte *) &loc->sectors)) return -EFAULT;
if (put_user(bios_cyl, (unsigned short *) &loc->cylinders)) return -EFAULT;
if (put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
(unsigned long *) &loc->start)) return -EFAULT;
return 0;
}
case HDIO_GETGEO_BIG:
{
struct hd_big_geometry *loc = (struct hd_big_geometry *) arg;
if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
if (put_user(drive->bios_head, (byte *) &loc->heads)) return -EFAULT;
if (put_user(drive->bios_sect, (byte *) &loc->sectors)) return -EFAULT;
if (put_user(drive->bios_cyl, (unsigned int *) &loc->cylinders)) return -EFAULT;
if (put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
(unsigned long *) &loc->start)) return -EFAULT;
return 0;
}
case HDIO_GETGEO_BIG_RAW:
{
struct hd_big_geometry *loc = (struct hd_big_geometry *) arg;
if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
if (put_user(drive->head, (byte *) &loc->heads)) return -EFAULT;
if (put_user(drive->sect, (byte *) &loc->sectors)) return -EFAULT;
if (put_user(drive->cyl, (unsigned int *) &loc->cylinders)) return -EFAULT;
if (put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
(unsigned long *) &loc->start)) return -EFAULT;
return 0;
}
case BLKGETSIZE: /* Return device size */
return put_user(drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects, (unsigned long *) arg);
case BLKGETSIZE64:
return put_user((u64)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects << 9, (u64 *) arg);
case BLKRRPART: /* Re-read partition tables */
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
return ide_revalidate_disk(inode->i_rdev);
case HDIO_OBSOLETE_IDENTITY:
case HDIO_GET_IDENTITY:
if (MINOR(inode->i_rdev) & PARTN_MASK)
return -EINVAL;
if (drive->id == NULL)
return -ENOMSG;
if (copy_to_user((char *)arg, (char *)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->nice0 << IDE_NICE_0 |
drive->nice1 << IDE_NICE_1 |
drive->nice2 << IDE_NICE_2,
(long *) arg);
case HDIO_DRIVE_CMD:
{
byte args[4], *argbuf = args;
byte xfer_rate = 0;
int argsize = 4;
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) return -EACCES;
if (NULL == (void *) arg)
return ide_do_drive_cmd(drive, &rq, ide_wait);
if (copy_from_user(args, (void *)arg, 4))
return -EFAULT;
if (args[3]) {
argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
argbuf = kmalloc(argsize, GFP_KERNEL);
if (argbuf == NULL)
return -ENOMEM;
memcpy(argbuf, args, 4);
}
if (set_transfer(drive, args[0], args[1], args[2])) {
xfer_rate = args[1];
if (ide_ata66_check(drive, args[0], args[1], args[2]))
goto abort;
}
err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
if (!err && xfer_rate) {
/* active-retuning-calls future */
if ((HWIF(drive)->speedproc) != NULL)
HWIF(drive)->speedproc(drive, xfer_rate);
ide_driveid_update(drive);
}
abort:
if (copy_to_user((void *)arg, argbuf, argsize))
err = -EFAULT;
if (argsize > 4)
kfree(argbuf);
return err;
}
case HDIO_DRIVE_TASK:
{
byte args[7], *argbuf = args;
int argsize = 7;
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) return -EACCES;
if (copy_from_user(args, (void *)arg, 7))
return -EFAULT;
err = ide_wait_cmd_task(drive, argbuf);
if (copy_to_user((void *)arg, argbuf, argsize))
err = -EFAULT;
return err;
}
case HDIO_SCAN_HWIF:
{
int args[3];
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
if (copy_from_user(args, (void *)arg, 3 * sizeof(int)))
return -EFAULT;
if (ide_register(args[0], args[1], args[2]) == -1)
return -EIO;
return 0;
}
case HDIO_UNREGISTER_HWIF:
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
/* (arg > MAX_HWIFS) checked in function */
ide_unregister(arg);
return 0;
case HDIO_SET_NICE:
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
if (drive->driver == NULL)
return -EPERM;
if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
return -EPERM;
drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
if (drive->dsc_overlap && !DRIVER(drive)->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;
(void) ide_do_reset(drive);
if (drive->suspend_reset) {
/*
* APM WAKE UP todo !!
* int nogoodpower = 1;
* while(nogoodpower) {
* check_power1() or check_power2()
* nogoodpower = 0;
* }
* HWIF(drive)->multiproc(drive);
*/
return ide_revalidate_disk(inode->i_rdev);
}
return 0;
case BLKROSET:
case BLKROGET:
case BLKFLSBUF:
case BLKSSZGET:
case BLKPG:
case BLKELVGET:
case BLKELVSET:
case BLKBSZGET:
case BLKBSZSET:
return blk_ioctl(inode->i_rdev, cmd, arg);
case HDIO_GET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (put_user(HWIF(drive)->bus_state, (long *)arg))
return -EFAULT;
return 0;
case HDIO_SET_BUSSTATE:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (HWIF(drive)->busproc)
HWIF(drive)->busproc(HWIF(drive), arg);
return 0;
default:
if (drive->driver != NULL)
return DRIVER(drive)->ioctl(drive, inode, file, cmd, arg);
return -EPERM;
}
}
static int ide_check_media_change (kdev_t i_rdev)
{
ide_drive_t *drive;
if ((drive = get_info_ptr(i_rdev)) == NULL)
return -ENODEV;
if (drive->driver != NULL)
return DRIVER(drive)->media_change(drive);
return 0;
}
void ide_fixstring (byte *s, const int bytecount, const int byteswap)
{
byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
if (byteswap) {
/* convert from big-endian to host byte order */
for (p = end ; p != s;) {
unsigned short *pp = (unsigned short *) (p -= 2);
*pp = ntohs(*pp);
}
}
/* strip leading blanks */
while (s != end && *s == ' ')
++s;
/* compress internal blanks and strip trailing blanks */
while (s != end && *s) {
if (*s++ != ' ' || (s != end && *s && *s != ' '))
*p++ = *(s-1);
}
/* wipe out trailing garbage */
while (p != end)
*p++ = '\0';
}
/*
* 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 */
}
/*
* ide_setup() gets called VERY EARLY during initialization,
* to handle kernel "command line" strings beginning with "hdx="
* or "ide". Here is the complete set currently supported:
*
* "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
* "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
*
* "hdx=noprobe" : drive may be present, but do not probe for it
* "hdx=none" : drive is NOT present, ignore cmos and do not probe
* "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
* "hdx=cdrom" : drive is present, and is a cdrom drive
* "hdx=cyl,head,sect" : disk drive is present, with specified geometry
* "hdx=noremap" : do not remap 0->1 even though EZD was detected
* "hdx=autotune" : driver will attempt to tune interface speed
* to the fastest PIO mode supported,
* if possible for this drive only.
* Not fully supported by all chipset types,
* and quite likely to cause trouble with
* older/odd IDE drives.
*
* "hdx=slow" : insert a huge pause after each access to the data
* port. Should be used only as a last resort.
*
* "hdx=swapdata" : when the drive is a disk, byte swap all data
* "hdx=bswap" : same as above..........
* "hdxlun=xx" : set the drive last logical unit.
* "hdx=flash" : allows for more than one ata_flash disk to be
* registered. In most cases, only one device
* will be present.
* "hdx=scsi" : the return of the ide-scsi flag, this is useful for
* allowwing ide-floppy, ide-tape, and ide-cdrom|writers
* to use ide-scsi emulation on a device specific option.
* "idebus=xx" : inform IDE driver of VESA/PCI bus speed in MHz,
* where "xx" is between 20 and 66 inclusive,
* used when tuning chipset PIO modes.
* For PCI bus, 25 is correct for a P75 system,
* 30 is correct for P90,P120,P180 systems,
* and 33 is used for P100,P133,P166 systems.
* If in doubt, use idebus=33 for PCI.
* As for VLB, it is safest to not specify it.
*
* "idex=noprobe" : do not attempt to access/use this interface
* "idex=base" : probe for an interface at the addr specified,
* where "base" is usually 0x1f0 or 0x170
* and "ctl" is assumed to be "base"+0x206
* "idex=base,ctl" : specify both base and ctl
* "idex=base,ctl,irq" : specify base, ctl, and irq number
* "idex=autotune" : driver will attempt to tune interface speed
* to the fastest PIO mode supported,
* for all drives on this interface.
* Not fully supported by all chipset types,
* and quite likely to cause trouble with
* older/odd IDE drives.
* "idex=noautotune" : driver will NOT attempt to tune interface speed
* This is the default for most chipsets,
* except the cmd640.
* "idex=serialize" : do not overlap operations on idex and ide(x^1)
* "idex=four" : four drives on idex and ide(x^1) share same ports
* "idex=reset" : reset interface before first use
* "idex=dma" : enable DMA by default on both drives if possible
* "idex=ata66" : informs the interface that it has an 80c cable
* for chipsets that are ATA-66 capable, but
* the ablity to bit test for detection is
* currently unknown.
* "ide=reverse" : Formerly called to pci sub-system, but now local.
*
* The following are valid ONLY on ide0, (except dc4030)
* and the defaults for the base,ctl ports must not be altered.
*
* "ide0=dtc2278" : probe/support DTC2278 interface
* "ide0=ht6560b" : probe/support HT6560B interface
* "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
* (not for PCI -- automatically detected)
* "ide0=qd65xx" : probe/support qd65xx interface
* "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
* "ide0=umc8672" : probe/support umc8672 chipsets
* "idex=dc4030" : probe/support Promise DC4030VL interface
* "ide=doubler" : probe/support IDE doublers on Amiga
*/
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)) /* hdx= & hdxlun= */
return 0;
printk("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("IDE: Prevented DMA\n");
noautodma = 1;
return 1;
}
#ifdef CONFIG_BLK_DEV_IDEPCI
if (!strcmp(s, "ide=reverse")) {
ide_scan_direction = 1;
printk(" : Enabled support for IDE inverse scan order.\n");
return 1;
}
#endif /* CONFIG_BLK_DEV_IDEPCI */
/*
* 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",
"serialize", "autotune", "noautotune",
"slow", "swapdata", "bswap", "flash",
"remap", "noremap", "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) {
strncpy(drive->driver_req, s + 4, 9);
goto done;
}
/*
* Look for last lun option: "hdxlun="
*/
if (s[3] == 'l' && s[4] == 'u' && s[5] == 'n') {
if (match_parm(&s[6], NULL, vals, 1) != 1)
goto bad_option;
if (vals[0] >= 0 && vals[0] <= 7) {
drive->last_lun = vals[0];
drive->forced_lun = 1;
} else
printk(" -- BAD LAST LUN! Expected value from 0 to 7");
goto done;
}
switch (match_parm(&s[3], hd_words, vals, 3)) {
case -1: /* "none" */
drive->nobios = 1; /* drop into "noprobe" */
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;
hwif->noprobe = 0;
goto done;
case -5: /* "serialize" */
printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
goto do_serialize;
case -6: /* "autotune" */
drive->autotune = 1;
goto done;
case -7: /* "noautotune" */
drive->autotune = 2;
goto done;
case -8: /* "slow" */
drive->slow = 1;
goto done;
case -9: /* "swapdata" or "bswap" */
case -10:
drive->bswap = 1;
goto done;
case -11: /* "flash" */
drive->ata_flash = 1;
goto done;
case -12: /* "remap" */
drive->remap_0_to_1 = 1;
goto done;
case -13: /* "noremap" */
drive->remap_0_to_1 = 2;
goto done;
case -14: /* "scsi" */
#if defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI)
drive->scsi = 1;
goto done;
#else
drive->scsi = 0;
goto bad_option;
#endif /* defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI) */
case 3: /* cyl,head,sect */
drive->media = ide_disk;
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 for future idex calls to ease the hardcoding.
*/
const char *ide_words[] = {
"noprobe", "serialize", "autotune", "noautotune", "reset", "dma", "ata66",
"minus8", "minus9", "minus10",
"four", "qd65xx", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", 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:
*/
if (i > 0 || i <= -11) { /* is parameter a chipset name? */
if (hwif->chipset != ide_unknown)
goto bad_option; /* chipset already specified */
if (i <= -11 && i != -18 && hw != 0)
goto bad_hwif; /* chipset drivers are for "ide0=" only */
if (i <= -11 && i != -18 && ide_hwifs[hw+1].chipset != ide_unknown)
goto bad_option; /* chipset for 2nd port already specified */
printk("\n");
}
switch (i) {
#ifdef CONFIG_BLK_DEV_PDC4030
case -18: /* "dc4030" */
{
extern void init_pdc4030(void);
init_pdc4030();
goto done;
}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_ALI14XX
case -17: /* "ali14xx" */
{
extern void init_ali14xx (void);
init_ali14xx();
goto done;
}
#endif /* CONFIG_BLK_DEV_ALI14XX */
#ifdef CONFIG_BLK_DEV_UMC8672
case -16: /* "umc8672" */
{
extern void init_umc8672 (void);
init_umc8672();
goto done;
}
#endif /* CONFIG_BLK_DEV_UMC8672 */
#ifdef CONFIG_BLK_DEV_DTC2278
case -15: /* "dtc2278" */
{
extern void init_dtc2278 (void);
init_dtc2278();
goto done;
}
#endif /* CONFIG_BLK_DEV_DTC2278 */
#ifdef CONFIG_BLK_DEV_CMD640
case -14: /* "cmd640_vlb" */
{
extern int cmd640_vlb; /* flag for cmd640.c */
cmd640_vlb = 1;
goto done;
}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_HT6560B
case -13: /* "ht6560b" */
{
extern void init_ht6560b (void);
init_ht6560b();
goto done;
}
#endif /* CONFIG_BLK_DEV_HT6560B */
#if CONFIG_BLK_DEV_QD65XX
case -12: /* "qd65xx" */
{
extern void init_qd65xx (void);
init_qd65xx();
goto done;
}
#endif /* CONFIG_BLK_DEV_QD65XX */
#ifdef CONFIG_BLK_DEV_4DRIVES
case -11: /* "four" drives on one set of ports */
{
ide_hwif_t *mate = &ide_hwifs[hw^1];
mate->drives[0].select.all ^= 0x20;
mate->drives[1].select.all ^= 0x20;
hwif->chipset = mate->chipset = ide_4drives;
mate->irq = hwif->irq;
memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
goto do_serialize;
}
#endif /* CONFIG_BLK_DEV_4DRIVES */
case -10: /* minus10 */
case -9: /* minus9 */
case -8: /* minus8 */
goto bad_option;
case -7: /* ata66 */
#ifdef CONFIG_BLK_DEV_IDEPCI
hwif->udma_four = 1;
goto done;
#else /* !CONFIG_BLK_DEV_IDEPCI */
hwif->udma_four = 0;
goto bad_hwif;
#endif /* CONFIG_BLK_DEV_IDEPCI */
case -6: /* dma */
hwif->autodma = 1;
goto done;
case -5: /* "reset" */
hwif->reset = 1;
goto done;
case -4: /* "noautotune" */
hwif->drives[0].autotune = 2;
hwif->drives[1].autotune = 2;
goto done;
case -3: /* "autotune" */
hwif->drives[0].autotune = 1;
hwif->drives[1].autotune = 1;
goto done;
case -2: /* "serialize" */
do_serialize:
hwif->mate = &ide_hwifs[hw^1];
hwif->mate->mate = hwif;
hwif->serialized = hwif->mate->serialized = 1;
goto done;
case -1: /* "noprobe" */
hwif->noprobe = 1;
goto done;
case 1: /* base */
vals[1] = vals[0] + 0x206; /* default ctl */
case 2: /* base,ctl */
vals[2] = 0; /* default irq = probe for it */
case 3: /* base,ctl,irq */
hwif->hw.irq = vals[2];
ide_init_hwif_ports(&hwif->hw, (ide_ioreg_t) vals[0], (ide_ioreg_t) vals[1], &hwif->irq);
memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
hwif->irq = vals[2];
hwif->noprobe = 0;
hwif->chipset = ide_generic;
goto done;
case 0: goto bad_option;
default:
printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
return 1;
}
}
bad_option:
printk(" -- BAD OPTION\n");
return 1;
bad_hwif:
printk("-- NOT SUPPORTED ON ide%d", hw);
done:
printk("\n");
return 1;
}
/*
* probe_for_hwifs() finds/initializes "known" IDE interfaces
*/
static void __init probe_for_hwifs (void)
{
#ifdef CONFIG_PCI
if (pci_present())
{
#ifdef CONFIG_BLK_DEV_IDEPCI
ide_scan_pcibus(ide_scan_direction);
#else
#ifdef CONFIG_BLK_DEV_RZ1000
{
extern void ide_probe_for_rz100x(void);
ide_probe_for_rz100x();
}
#endif /* CONFIG_BLK_DEV_RZ1000 */
#endif /* CONFIG_BLK_DEV_IDEPCI */
}
#endif /* CONFIG_PCI */
#ifdef CONFIG_ETRAX_IDE
{
extern void init_e100_ide(void);
init_e100_ide();
}
#endif /* CONFIG_ETRAX_IDE */
#ifdef CONFIG_BLK_DEV_CMD640
{
extern void ide_probe_for_cmd640x(void);
ide_probe_for_cmd640x();
}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_PDC4030
{
extern int ide_probe_for_pdc4030(void);
(void) ide_probe_for_pdc4030();
}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_IDE_PMAC
{
extern void pmac_ide_probe(void);
pmac_ide_probe();
}
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#ifdef CONFIG_BLK_DEV_IDE_ICSIDE
{
extern void icside_init(void);
icside_init();
}
#endif /* CONFIG_BLK_DEV_IDE_ICSIDE */
#ifdef CONFIG_BLK_DEV_IDE_RAPIDE
{
extern void rapide_init(void);
rapide_init();
}
#endif /* CONFIG_BLK_DEV_IDE_RAPIDE */
#ifdef CONFIG_BLK_DEV_GAYLE
{
extern void gayle_init(void);
gayle_init();
}
#endif /* CONFIG_BLK_DEV_GAYLE */
#ifdef CONFIG_BLK_DEV_FALCON_IDE
{
extern void falconide_init(void);
falconide_init();
}
#endif /* CONFIG_BLK_DEV_FALCON_IDE */
#ifdef CONFIG_BLK_DEV_MAC_IDE
{
extern void macide_init(void);
macide_init();
}
#endif /* CONFIG_BLK_DEV_MAC_IDE */
#ifdef CONFIG_BLK_DEV_Q40IDE
{
extern void q40ide_init(void);
q40ide_init();
}
#endif /* CONFIG_BLK_DEV_Q40IDE */
#ifdef CONFIG_BLK_DEV_BUDDHA
{
extern void buddha_init(void);
buddha_init();
}
#endif /* CONFIG_BLK_DEV_BUDDHA */
#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP)
{
extern void pnpide_init(int enable);
pnpide_init(1);
}
#endif /* CONFIG_BLK_DEV_ISAPNP */
}
void __init ide_init_builtin_drivers (void)
{
/*
* Probe for special PCI and other "known" interface chipsets
*/
probe_for_hwifs ();
#ifdef CONFIG_BLK_DEV_IDE
#if defined(__mc68000__) || defined(CONFIG_APUS)
if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET]) {
ide_get_lock(&ide_lock, NULL, NULL); /* for atari only */
disable_irq(ide_hwifs[0].irq); /* disable_irq_nosync ?? */
// disable_irq_nosync(ide_hwifs[0].irq);
}
#endif /* __mc68000__ || CONFIG_APUS */
(void) ideprobe_init();
#if defined(__mc68000__) || defined(CONFIG_APUS)
if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET]) {
enable_irq(ide_hwifs[0].irq);
ide_release_lock(&ide_lock); /* for atari only */
}
#endif /* __mc68000__ || CONFIG_APUS */
#endif /* CONFIG_BLK_DEV_IDE */
#ifdef CONFIG_PROC_FS
proc_ide_create();
#endif
/*
* Attempt to match drivers for the available drives
*/
#ifdef CONFIG_BLK_DEV_IDEDISK
(void) idedisk_init();
#endif /* CONFIG_BLK_DEV_IDEDISK */
#ifdef CONFIG_BLK_DEV_IDECD
(void) ide_cdrom_init();
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
(void) idetape_init();
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
(void) idefloppy_init();
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
#ifdef CONFIG_SCSI
(void) idescsi_init();
#else
#warning ide scsi-emulation selected but no SCSI-subsystem in kernel
#endif
#endif /* CONFIG_BLK_DEV_IDESCSI */
}
static int default_cleanup (ide_drive_t *drive)
{
return ide_unregister_subdriver(drive);
}
static ide_startstop_t default_do_request(ide_drive_t *drive, struct request *rq, unsigned long block)
{
ide_end_request(0, HWGROUP(drive));
return ide_stopped;
}
static void default_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
{
ide_end_request(uptodate, hwgroup);
}
static int default_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return -EIO;
}
static int default_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
drive->usage--;
return -EIO;
}
static void default_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
}
static int default_check_media_change (ide_drive_t *drive)
{
return 1;
}
static void default_pre_reset (ide_drive_t *drive)
{
}
static unsigned long default_capacity (ide_drive_t *drive)
{
return 0x7fffffff;
}
static ide_startstop_t default_special (ide_drive_t *drive)
{
special_t *s = &drive->special;
s->all = 0;
drive->mult_req = 0;
return ide_stopped;
}
static int default_driver_reinit (ide_drive_t *drive)
{
printk(KERN_ERR "%s: does not support hotswap of device class !\n", drive->name);
return 0;
}
static void setup_driver_defaults (ide_drive_t *drive)
{
ide_driver_t *d = drive->driver;
if (d->cleanup == NULL) d->cleanup = default_cleanup;
if (d->do_request == NULL) d->do_request = default_do_request;
if (d->end_request == NULL) d->end_request = default_end_request;
if (d->ioctl == NULL) d->ioctl = default_ioctl;
if (d->open == NULL) d->open = default_open;
if (d->release == NULL) d->release = default_release;
if (d->media_change == NULL) d->media_change = default_check_media_change;
if (d->pre_reset == NULL) d->pre_reset = default_pre_reset;
if (d->capacity == NULL) d->capacity = default_capacity;
if (d->special == NULL) d->special = default_special;
if (d->driver_reinit == NULL) d->driver_reinit = default_driver_reinit;
}
ide_drive_t *ide_scan_devices (byte media, const char *name, ide_driver_t *driver, int n)
{
unsigned int unit, index, i;
for (index = 0, i = 0; index < MAX_HWIFS; ++index) {
ide_hwif_t *hwif = &ide_hwifs[index];
if (!hwif->present)
continue;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
char *req = drive->driver_req;
if (*req && !strstr(name, req))
continue;
if (drive->present && drive->media == media && drive->driver == driver && ++i > n)
return drive;
}
}
return NULL;
}
int ide_register_subdriver (ide_drive_t *drive, ide_driver_t *driver, int version)
{
unsigned long flags;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
if (version != IDE_SUBDRIVER_VERSION || !drive->present || drive->driver != NULL || drive->busy || drive->usage) {
restore_flags(flags); /* all CPUs */
return 1;
}
drive->driver = driver;
setup_driver_defaults(drive);
restore_flags(flags); /* all CPUs */
if (drive->autotune != 2) {
if (driver->supports_dma && HWIF(drive)->dmaproc != NULL) {
/*
* Force DMAing for the beginning of the check.
* Some chipsets appear to do interesting things,
* if not checked and cleared.
* PARANOIA!!!
*/
(void) (HWIF(drive)->dmaproc(ide_dma_off_quietly, drive));
(void) (HWIF(drive)->dmaproc(ide_dma_check, drive));
}
drive->dsc_overlap = (drive->next != drive && driver->supports_dsc_overlap);
drive->nice1 = 1;
}
drive->revalidate = 1;
drive->suspend_reset = 0;
#ifdef CONFIG_PROC_FS
ide_add_proc_entries(drive->proc, generic_subdriver_entries, drive);
ide_add_proc_entries(drive->proc, driver->proc, drive);
#endif
return 0;
}
int ide_unregister_subdriver (ide_drive_t *drive)
{
unsigned long flags;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
if (drive->usage || drive->busy || drive->driver == NULL || DRIVER(drive)->busy) {
restore_flags(flags); /* all CPUs */
return 1;
}
#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP) && defined(MODULE)
pnpide_init(0);
#endif /* CONFIG_BLK_DEV_ISAPNP */
#ifdef CONFIG_PROC_FS
ide_remove_proc_entries(drive->proc, DRIVER(drive)->proc);
ide_remove_proc_entries(drive->proc, generic_subdriver_entries);
#endif
auto_remove_settings(drive);
drive->driver = NULL;
restore_flags(flags); /* all CPUs */
return 0;
}
int ide_register_module (ide_module_t *module)
{
ide_module_t *p = ide_modules;
while (p) {
if (p == module)
return 1;
p = p->next;
}
module->next = ide_modules;
ide_modules = module;
revalidate_drives();
return 0;
}
void ide_unregister_module (ide_module_t *module)
{
ide_module_t **p;
for (p = &ide_modules; (*p) && (*p) != module; p = &((*p)->next));
if (*p)
*p = (*p)->next;
}
struct block_device_operations ide_fops[] = {{
owner: THIS_MODULE,
open: ide_open,
release: ide_release,
ioctl: ide_ioctl,
check_media_change: ide_check_media_change,
revalidate: ide_revalidate_disk
}};
EXPORT_SYMBOL(ide_hwifs);
EXPORT_SYMBOL(ide_register_module);
EXPORT_SYMBOL(ide_unregister_module);
EXPORT_SYMBOL(ide_spin_wait_hwgroup);
/*
* Probe module
*/
devfs_handle_t ide_devfs_handle;
EXPORT_SYMBOL(ide_probe);
EXPORT_SYMBOL(drive_is_flashcard);
EXPORT_SYMBOL(ide_timer_expiry);
EXPORT_SYMBOL(ide_intr);
EXPORT_SYMBOL(ide_fops);
EXPORT_SYMBOL(ide_get_queue);
EXPORT_SYMBOL(ide_add_generic_settings);
EXPORT_SYMBOL(ide_devfs_handle);
EXPORT_SYMBOL(do_ide_request);
/*
* Driver module
*/
EXPORT_SYMBOL(ide_scan_devices);
EXPORT_SYMBOL(ide_register_subdriver);
EXPORT_SYMBOL(ide_unregister_subdriver);
EXPORT_SYMBOL(ide_replace_subdriver);
EXPORT_SYMBOL(ide_input_data);
EXPORT_SYMBOL(ide_output_data);
EXPORT_SYMBOL(atapi_input_bytes);
EXPORT_SYMBOL(atapi_output_bytes);
EXPORT_SYMBOL(ide_set_handler);
EXPORT_SYMBOL(ide_dump_status);
EXPORT_SYMBOL(ide_error);
EXPORT_SYMBOL(ide_fixstring);
EXPORT_SYMBOL(ide_wait_stat);
EXPORT_SYMBOL(ide_do_reset);
EXPORT_SYMBOL(restart_request);
EXPORT_SYMBOL(ide_init_drive_cmd);
EXPORT_SYMBOL(ide_do_drive_cmd);
EXPORT_SYMBOL(ide_end_drive_cmd);
EXPORT_SYMBOL(ide_end_request);
EXPORT_SYMBOL(ide_revalidate_disk);
EXPORT_SYMBOL(ide_cmd);
EXPORT_SYMBOL(ide_wait_cmd);
EXPORT_SYMBOL(ide_wait_cmd_task);
EXPORT_SYMBOL(ide_delay_50ms);
EXPORT_SYMBOL(ide_stall_queue);
#ifdef CONFIG_PROC_FS
EXPORT_SYMBOL(ide_add_proc_entries);
EXPORT_SYMBOL(ide_remove_proc_entries);
EXPORT_SYMBOL(proc_ide_read_geometry);
EXPORT_SYMBOL(create_proc_ide_interfaces);
#endif
EXPORT_SYMBOL(ide_add_setting);
EXPORT_SYMBOL(ide_remove_setting);
EXPORT_SYMBOL(ide_register_hw);
EXPORT_SYMBOL(ide_register);
EXPORT_SYMBOL(ide_unregister);
EXPORT_SYMBOL(ide_setup_ports);
EXPORT_SYMBOL(hwif_unregister);
EXPORT_SYMBOL(get_info_ptr);
EXPORT_SYMBOL(current_capacity);
EXPORT_SYMBOL(system_bus_clock);
/*
* This is gets invoked once during initialization, to set *everything* up
*/
int __init ide_init (void)
{
static char banner_printed;
int i;
if (!banner_printed) {
printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
ide_devfs_handle = devfs_mk_dir (NULL, "ide", NULL);
system_bus_speed = ide_system_bus_speed();
banner_printed = 1;
}
init_ide_data ();
initializing = 1;
ide_init_builtin_drivers();
initializing = 0;
for (i = 0; i < MAX_HWIFS; ++i) {
ide_hwif_t *hwif = &ide_hwifs[i];
if (hwif->present)
ide_geninit(hwif);
}
return 0;
}
#ifdef MODULE
char *options = NULL;
MODULE_PARM(options,"s");
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 ("Unknown option '%s'\n", line);
}
}
int init_module (void)
{
parse_options(options);
return ide_init();
}
void cleanup_module (void)
{
int index;
for (index = 0; index < MAX_HWIFS; ++index) {
ide_unregister(index);
#if defined(CONFIG_BLK_DEV_IDEDMA) && !defined(CONFIG_DMA_NONPCI)
if (ide_hwifs[index].dma_base)
(void) ide_release_dma(&ide_hwifs[index]);
#endif /* (CONFIG_BLK_DEV_IDEDMA) && !(CONFIG_DMA_NONPCI) */
}
#ifdef CONFIG_PROC_FS
proc_ide_destroy();
#endif
devfs_unregister (ide_devfs_handle);
}
#else /* !MODULE */
__setup("", ide_setup);
#endif /* MODULE */
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