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ide.c
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/*
* linux/drivers/ide/ide.c Version 7.00beta2 Mar 05 2003
*
* 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
* Version 7.00alpha First named revision of ide rearrange
*
* 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: 7.00alpha2"
#define VERSION "Id: ide.c 7.00a2 20020906"
#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>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/completion.h>
#include <linux/reboot.h>
#include <linux/cdrom.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
IDE2_MAJOR, IDE3_MAJOR,
IDE4_MAJOR, IDE5_MAJOR,
IDE6_MAJOR, IDE7_MAJOR,
IDE8_MAJOR, IDE9_MAJOR };
static int idebus_parameter; /* holds the "idebus=" parameter */
static int system_bus_speed; /* holds what we think is VESA/PCI bus speed */
static int initializing; /* set while initializing built-in drivers */
DECLARE_MUTEX(ide_cfg_sem);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
#ifdef CONFIG_BLK_DEV_IDEPCI
static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
#endif
#ifdef CONFIG_IDEDMA_AUTO
int noautodma = 0;
#else
int noautodma = 1;
#endif
EXPORT_SYMBOL(noautodma);
/*
* This is declared extern in ide.h, for access by other IDE modules:
*/
ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
EXPORT_SYMBOL(ide_hwifs);
/*
* Do not even *think* about calling this!
*/
static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
{
unsigned int unit;
/* bulk initialize hwif & drive info with zeros */
memset(hwif, 0, sizeof(ide_hwif_t));
/* fill in any non-zero initial values */
hwif->index = index;
hwif->major = ide_hwif_to_major[index];
hwif->name[0] = 'i';
hwif->name[1] = 'd';
hwif->name[2] = 'e';
hwif->name[3] = '0' + index;
hwif->bus_state = BUSSTATE_ON;
hwif->atapi_dma = 0; /* disable all atapi dma */
hwif->ultra_mask = 0x80; /* disable all ultra */
hwif->mwdma_mask = 0x80; /* disable all mwdma */
hwif->swdma_mask = 0x80; /* disable all swdma */
sema_init(&hwif->gendev_rel_sem, 0);
default_hwif_iops(hwif);
default_hwif_transport(hwif);
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;
drive->using_dma = 0;
drive->is_flash = 0;
drive->vdma = 0;
INIT_LIST_HEAD(&drive->list);
sema_init(&drive->gendev_rel_sem, 0);
}
}
static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
{
hw_regs_t hw;
memset(&hw, 0, sizeof(hw_regs_t));
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
}
extern void ide_arm_init(void);
/*
* init_ide_data() sets reasonable default values into all fields
* of all instances of the hwifs and drives, but only on the first call.
* Subsequent calls have no effect (they don't wipe out anything).
*
* This routine is normally called at driver initialization time,
* but may also be called MUCH earlier during kernel "command-line"
* parameter processing. As such, we cannot depend on any other parts
* of the kernel (such as memory allocation) to be functioning yet.
*
* This is too bad, as otherwise we could dynamically allocate the
* ide_drive_t structs as needed, rather than always consuming memory
* for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
*
* FIXME: We should stuff the setup data into __init and copy the
* relevant hwifs/allocate them properly during boot.
*/
#define MAGIC_COOKIE 0x12345678
static void __init init_ide_data (void)
{
ide_hwif_t *hwif;
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) {
hwif = &ide_hwifs[index];
init_hwif_data(hwif, index);
init_hwif_default(hwif, index);
#if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
hwif->irq = hwif->hw.irq =
ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
#endif
}
#ifdef CONFIG_IDE_ARM
initializing = 1;
ide_arm_init();
initializing = 0;
#endif
}
/**
* ide_system_bus_speed - guess bus speed
*
* ide_system_bus_speed() returns what we think is the system VESA/PCI
* bus speed (in MHz). This is used for calculating interface PIO timings.
* The default is 40 for known PCI systems, 50 otherwise.
* The "idebus=xx" parameter can be used to override this value.
* The actual value to be used is computed/displayed the first time
* through. Drivers should only use this as a last resort.
*
* Returns a guessed speed in MHz.
*/
static int ide_system_bus_speed(void)
{
#ifdef CONFIG_PCI
static struct pci_device_id pci_default[] = {
{ PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
{ }
};
#else
#define pci_default 0
#endif /* CONFIG_PCI */
if (!system_bus_speed) {
if (idebus_parameter) {
/* user supplied value */
system_bus_speed = idebus_parameter;
} else if (pci_dev_present(pci_default)) {
/* safe default value for PCI */
system_bus_speed = 33;
} else {
/* safe default value for VESA and PCI */
system_bus_speed = 50;
}
printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
"for PIO modes%s\n", system_bus_speed,
idebus_parameter ? "" : "; override with idebus=xx");
}
return system_bus_speed;
}
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_ide_root;
#endif
static struct resource* hwif_request_region(ide_hwif_t *hwif,
unsigned long addr, int num)
{
struct resource *res = request_region(addr, num, hwif->name);
if (!res)
printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
hwif->name, addr, addr+num-1);
return res;
}
/**
* ide_hwif_request_regions - request resources for IDE
* @hwif: interface to use
*
* Requests all the needed resources for an interface.
* Right now core IDE code does this work which is deeply wrong.
* MMIO leaves it to the controller driver,
* PIO will migrate this way over time.
*/
int ide_hwif_request_regions(ide_hwif_t *hwif)
{
unsigned long addr;
unsigned int i;
if (hwif->mmio == 2)
return 0;
BUG_ON(hwif->mmio == 1);
addr = hwif->io_ports[IDE_CONTROL_OFFSET];
if (addr && !hwif_request_region(hwif, addr, 1))
goto control_region_busy;
hwif->straight8 = 0;
addr = hwif->io_ports[IDE_DATA_OFFSET];
if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
if (!hwif_request_region(hwif, addr, 8))
goto data_region_busy;
hwif->straight8 = 1;
return 0;
}
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
addr = hwif->io_ports[i];
if (!hwif_request_region(hwif, addr, 1)) {
while (--i)
release_region(addr, 1);
goto data_region_busy;
}
}
return 0;
data_region_busy:
addr = hwif->io_ports[IDE_CONTROL_OFFSET];
if (addr)
release_region(addr, 1);
control_region_busy:
/* If any errors are return, we drop the hwif interface. */
return -EBUSY;
}
/**
* ide_hwif_release_regions - free IDE resources
*
* Note that we only release the standard ports,
* and do not even try to handle any extra ports
* allocated for weird IDE interface chipsets.
*
* Note also that we don't yet handle mmio resources here. More
* importantly our caller should be doing this so we need to
* restructure this as a helper function for drivers.
*/
void ide_hwif_release_regions(ide_hwif_t *hwif)
{
u32 i = 0;
if (hwif->mmio == 2)
return;
if (hwif->io_ports[IDE_CONTROL_OFFSET])
release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
if (hwif->straight8) {
release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
return;
}
for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
if (hwif->io_ports[i])
release_region(hwif->io_ports[i], 1);
}
/**
* ide_hwif_restore - restore hwif to template
* @hwif: hwif to update
* @tmp_hwif: template
*
* Restore hwif to a previous state by copying most settngs
* from the template.
*/
static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
{
hwif->hwgroup = tmp_hwif->hwgroup;
hwif->gendev.parent = tmp_hwif->gendev.parent;
hwif->proc = tmp_hwif->proc;
hwif->major = tmp_hwif->major;
hwif->straight8 = tmp_hwif->straight8;
hwif->bus_state = tmp_hwif->bus_state;
hwif->atapi_dma = tmp_hwif->atapi_dma;
hwif->ultra_mask = tmp_hwif->ultra_mask;
hwif->mwdma_mask = tmp_hwif->mwdma_mask;
hwif->swdma_mask = tmp_hwif->swdma_mask;
hwif->chipset = tmp_hwif->chipset;
hwif->hold = tmp_hwif->hold;
#ifdef CONFIG_BLK_DEV_IDEPCI
hwif->pci_dev = tmp_hwif->pci_dev;
hwif->cds = tmp_hwif->cds;
#endif
hwif->tuneproc = tmp_hwif->tuneproc;
hwif->speedproc = tmp_hwif->speedproc;
hwif->selectproc = tmp_hwif->selectproc;
hwif->reset_poll = tmp_hwif->reset_poll;
hwif->pre_reset = tmp_hwif->pre_reset;
hwif->resetproc = tmp_hwif->resetproc;
hwif->intrproc = tmp_hwif->intrproc;
hwif->maskproc = tmp_hwif->maskproc;
hwif->quirkproc = tmp_hwif->quirkproc;
hwif->busproc = tmp_hwif->busproc;
hwif->ata_input_data = tmp_hwif->ata_input_data;
hwif->ata_output_data = tmp_hwif->ata_output_data;
hwif->atapi_input_bytes = tmp_hwif->atapi_input_bytes;
hwif->atapi_output_bytes = tmp_hwif->atapi_output_bytes;
hwif->dma_setup = tmp_hwif->dma_setup;
hwif->dma_exec_cmd = tmp_hwif->dma_exec_cmd;
hwif->dma_start = tmp_hwif->dma_start;
hwif->ide_dma_end = tmp_hwif->ide_dma_end;
hwif->ide_dma_check = tmp_hwif->ide_dma_check;
hwif->ide_dma_on = tmp_hwif->ide_dma_on;
hwif->ide_dma_off_quietly = tmp_hwif->ide_dma_off_quietly;
hwif->ide_dma_test_irq = tmp_hwif->ide_dma_test_irq;
hwif->ide_dma_host_on = tmp_hwif->ide_dma_host_on;
hwif->ide_dma_host_off = tmp_hwif->ide_dma_host_off;
hwif->ide_dma_lostirq = tmp_hwif->ide_dma_lostirq;
hwif->ide_dma_timeout = tmp_hwif->ide_dma_timeout;
hwif->OUTB = tmp_hwif->OUTB;
hwif->OUTBSYNC = tmp_hwif->OUTBSYNC;
hwif->OUTW = tmp_hwif->OUTW;
hwif->OUTL = tmp_hwif->OUTL;
hwif->OUTSW = tmp_hwif->OUTSW;
hwif->OUTSL = tmp_hwif->OUTSL;
hwif->INB = tmp_hwif->INB;
hwif->INW = tmp_hwif->INW;
hwif->INL = tmp_hwif->INL;
hwif->INSW = tmp_hwif->INSW;
hwif->INSL = tmp_hwif->INSL;
hwif->sg_max_nents = tmp_hwif->sg_max_nents;
hwif->mmio = tmp_hwif->mmio;
hwif->rqsize = tmp_hwif->rqsize;
hwif->no_lba48 = tmp_hwif->no_lba48;
#ifndef CONFIG_BLK_DEV_IDECS
hwif->irq = tmp_hwif->irq;
#endif
hwif->dma_base = tmp_hwif->dma_base;
hwif->dma_master = tmp_hwif->dma_master;
hwif->dma_command = tmp_hwif->dma_command;
hwif->dma_vendor1 = tmp_hwif->dma_vendor1;
hwif->dma_status = tmp_hwif->dma_status;
hwif->dma_vendor3 = tmp_hwif->dma_vendor3;
hwif->dma_prdtable = tmp_hwif->dma_prdtable;
hwif->dma_extra = tmp_hwif->dma_extra;
hwif->config_data = tmp_hwif->config_data;
hwif->select_data = tmp_hwif->select_data;
hwif->autodma = tmp_hwif->autodma;
hwif->udma_four = tmp_hwif->udma_four;
hwif->no_dsc = tmp_hwif->no_dsc;
hwif->hwif_data = tmp_hwif->hwif_data;
}
/**
* ide_unregister - free an ide interface
* @index: index of interface (will change soon to a pointer)
*
* Perform the final unregister of an IDE interface. At the moment
* we don't refcount interfaces so this will also get split up.
*
* Locking:
* The caller must not hold the IDE locks
* The drive present/vanishing is not yet properly locked
* Take care with the callbacks. These have been split to avoid
* deadlocking the IDE layer. The shutdown callback is called
* before we take the lock and free resources. It is up to the
* caller to be sure there is no pending I/O here, and that
* the interfce will not be reopened (present/vanishing locking
* isnt yet done btw). After we commit to the final kill we
* call the cleanup callback with the ide locks held.
*
* Unregister restores the hwif structures to the default state.
* This is raving bonkers.
*/
void ide_unregister(unsigned int index)
{
ide_drive_t *drive;
ide_hwif_t *hwif, *g;
static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
ide_hwgroup_t *hwgroup;
int irq_count = 0, unit;
BUG_ON(index >= MAX_HWIFS);
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
down(&ide_cfg_sem);
spin_lock_irq(&ide_lock);
hwif = &ide_hwifs[index];
if (!hwif->present)
goto abort;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
drive = &hwif->drives[unit];
if (!drive->present) {
if (drive->devfs_name[0] != '\0') {
devfs_remove(drive->devfs_name);
drive->devfs_name[0] = '\0';
}
continue;
}
spin_unlock_irq(&ide_lock);
device_unregister(&drive->gendev);
down(&drive->gendev_rel_sem);
spin_lock_irq(&ide_lock);
}
hwif->present = 0;
spin_unlock_irq(&ide_lock);
destroy_proc_ide_interface(hwif);
hwgroup = hwif->hwgroup;
/*
* free the irq if we were the only hwif using it
*/
g = hwgroup->hwif;
do {
if (g->irq == hwif->irq)
++irq_count;
g = g->next;
} while (g != hwgroup->hwif);
if (irq_count == 1)
free_irq(hwif->irq, hwgroup);
spin_lock_irq(&ide_lock);
/*
* Note that we only release the standard ports,
* and do not even try to handle any extra ports
* allocated for weird IDE interface chipsets.
*/
ide_hwif_release_regions(hwif);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
if (hwif->next == hwif) {
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
/* There is another interface in hwgroup.
* Unlink us, and set hwgroup->drive and ->hwif to
* something sane.
*/
g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Chose a random hwif for hwgroup->hwif.
* It's guaranteed that there are no drives
* left in the hwgroup.
*/
BUG_ON(hwgroup->drive != NULL);
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
/* More messed up locking ... */
spin_unlock_irq(&ide_lock);
device_unregister(&hwif->gendev);
down(&hwif->gendev_rel_sem);
/*
* Remove us from the kernel's knowledge
*/
blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
kfree(hwif->sg_table);
unregister_blkdev(hwif->major, hwif->name);
spin_lock_irq(&ide_lock);
if (hwif->dma_base) {
(void) ide_release_dma(hwif);
hwif->dma_base = 0;
hwif->dma_master = 0;
hwif->dma_command = 0;
hwif->dma_vendor1 = 0;
hwif->dma_status = 0;
hwif->dma_vendor3 = 0;
hwif->dma_prdtable = 0;
}
/* copy original settings */
tmp_hwif = *hwif;
/* restore hwif data to pristine status */
init_hwif_data(hwif, index);
init_hwif_default(hwif, index);
ide_hwif_restore(hwif, &tmp_hwif);
abort:
spin_unlock_irq(&ide_lock);
up(&ide_cfg_sem);
}
EXPORT_SYMBOL(ide_unregister);
/**
* ide_setup_ports - set up IDE interface ports
* @hw: register descriptions
* @base: base register
* @offsets: table of register offsets
* @ctrl: control register
* @ack_irq: IRQ ack
* @irq: interrupt lie
*
* 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. This is basically a helper
*
*/
void ide_setup_ports ( hw_regs_t *hw,
unsigned long base, int *offsets,
unsigned long ctrl, unsigned long intr,
ide_ack_intr_t *ack_intr,
/*
* ide_io_ops_t *iops,
*/
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;
/*
* hw->iops = iops;
*/
}
/**
* ide_register_hw_with_fixup - register IDE interface
* @hw: hardware registers
* @hwifp: pointer to returned hwif
* @fixup: fixup function
*
* Register an IDE interface, specifying exactly the registers etc.
* Set init=1 iff calling before probes have taken place.
*
* Returns -1 on error.
*/
int ide_register_hw_with_fixup(hw_regs_t *hw, ide_hwif_t **hwifp, void(*fixup)(ide_hwif_t *hwif))
{
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->hold)
continue;
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);
else if (!hwif->hold) {
init_hwif_data(hwif, index);
init_hwif_default(hwif, 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;
hwif->chipset = hw->chipset;
hwif->gendev.parent = hw->dev;
if (!initializing) {
probe_hwif_init_with_fixup(hwif, fixup);
create_proc_ide_interfaces();
}
if (hwifp)
*hwifp = hwif;
return (initializing || hwif->present) ? index : -1;
}
EXPORT_SYMBOL(ide_register_hw_with_fixup);
int ide_register_hw(hw_regs_t *hw, ide_hwif_t **hwifp)
{
return ide_register_hw_with_fixup(hw, hwifp, NULL);
}
EXPORT_SYMBOL(ide_register_hw);
/*
* Locks for IDE setting functionality
*/
DECLARE_MUTEX(ide_setting_sem);
/**
* __ide_add_setting - add an ide setting option
* @drive: drive to use
* @name: setting name
* @rw: true if the function is read write
* @read_ioctl: function to call on read
* @write_ioctl: function to call on write
* @data_type: type of data
* @min: range minimum
* @max: range maximum
* @mul_factor: multiplication scale
* @div_factor: divison scale
* @data: private data field
* @set: setting
* @auto_remove: setting auto removal flag
*
* Removes the setting named from the device if it is present.
* The function takes the settings_lock to protect against
* parallel changes. This function must not be called from IRQ
* context. Returns 0 on success or -1 on failure.
*
* BUGS: This code is seriously over-engineered. There is also
* magic about how the driver specific features are setup. If
* a driver is attached we assume the driver settings are auto
* remove.
*/
static int __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, int auto_remove)
{
ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
down(&ide_setting_sem);
while ((*p) && strcmp((*p)->name, name) < 0)
p = &((*p)->next);
if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
goto abort;
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 (auto_remove)
setting->auto_remove = 1;
*p = setting;
up(&ide_setting_sem);
return 0;
abort:
up(&ide_setting_sem);
kfree(setting);
return -1;
}
int 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)
{
return __ide_add_setting(drive, name, rw, read_ioctl, write_ioctl, data_type, min, max, mul_factor, div_factor, data, set, 1);
}
EXPORT_SYMBOL(ide_add_setting);
/**
* __ide_remove_setting - remove an ide setting option
* @drive: drive to use
* @name: setting name
*
* Removes the setting named from the device if it is present.
* The caller must hold the setting semaphore.
*/
static void __ide_remove_setting (ide_drive_t *drive, char *name)
{
ide_settings_t **p, *setting;
p = (ide_settings_t **) &drive->settings;
while ((*p) && strcmp((*p)->name, name))
p = &((*p)->next);
if ((setting = (*p)) == NULL)
return;
(*p) = setting->next;
kfree(setting->name);
kfree(setting);
}
/**
* ide_find_setting_by_ioctl - find a drive specific ioctl
* @drive: drive to scan
* @cmd: ioctl command to handle
*
* Scan's the device setting table for a matching entry and returns
* this or NULL if no entry is found. The caller must hold the
* setting semaphore
*/
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_find_setting_by_name - find a drive specific setting
* @drive: drive to scan
* @name: setting name
*
* Scan's the device setting table for a matching entry and returns
* this or NULL if no entry is found. The caller must hold the
* setting semaphore
*/
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;
}
/**
* auto_remove_settings - remove driver specific settings
* @drive: drive
*
* Automatically remove all the driver specific settings for this
* drive. This function may sleep and must not be called from IRQ
* context. The caller must hold ide_setting_sem.
*/
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;
}
}
/**
* ide_read_setting - read an IDE setting
* @drive: drive to read from
* @setting: drive setting