URL https://opencores.org/ocsvn/or1k_old/or1k_old/trunk
Subversion Repositories or1k_old

[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [armnommu/] [drivers/] [block/] [ide.c] - Blame information for rev 1782

Details | Compare with Previous | View Log

/*
 *  linux/drivers/block/ide.c   Version 5.53  Jun  24, 1997
 *
 *  Copyright (C) 1994-1996  Linus Torvalds & authors (see below)
 */
#define _IDE_C          /* needed by <linux/blk.h> */
 
/*
 *  Maintained by Mark Lord  <mlord@pobox.com>
 *            and Gadi Oxman <gadio@netvision.net.il>
 *
 * This is the multiple IDE interface driver, as evolved from hd.c.
 * It supports up to four 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
 *
 * It is easy to extend ide.c to handle more than four interfaces:
 *
 *      Change the MAX_HWIFS constant in ide.h.
 *
 *      Define some new major numbers (in major.h), and insert them into
 *      the ide_hwif_to_major table in ide.c.
 *
 *      Fill in the extra values for the new interfaces into the two tables
 *      inside ide.c:  default_io_base[]  and  default_irqs[].
 *
 *      Create the new request handlers by cloning "do_ide3_request()"
 *      for each new interface, and add them to the switch statement
 *      in the ide_init() function in ide.c.
 *
 *      Recompile, create the new /dev/ entries, and it will probably work.
 *
 *  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@mipg.upenn.edu)         ("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 3.5         correct the bios_cyl field if it's too small
 *  (linux 1.1.76)       (to help fdisk with brain-dead BIOSs)
 *  Version 3.6         cosmetic corrections to comments and stuff
 *  (linux 1.1.77)      reorganise probing code to make it understandable
 *                      added halfway retry to probing for drive identification
 *                      added "hdx=noprobe" command line option
 *                      allow setting multmode even when identification fails
 *  Version 3.7         move set_geometry=1 from do_identify() to ide_init()
 *                      increase DRQ_WAIT to eliminate nuisance messages
 *                      wait for DRQ_STAT instead of DATA_READY during probing
 *                        (courtesy of Gary Thomas gary@efland.UU.NET)
 *  Version 3.8         fixed byte-swapping for confused Mitsumi cdrom drives
 *                      update of ide-cd.c from Scott, allows blocksize=1024
 *                      cdrom probe fixes, inspired by jprang@uni-duisburg.de
 *  Version 3.9         don't use LBA if lba_capacity looks funny
 *                      correct the drive capacity calculations
 *                      fix probing for old Seagates without IDE_ALTSTATUS_REG
 *                      fix byte-ordering for some NEC cdrom drives
 *  Version 3.10        disable multiple mode by default; was causing trouble
 *  Version 3.11        fix mis-identification of old WD disks as cdroms
 *  Version 3,12        simplify logic for selecting initial mult_count
 *                        (fixes problems with buggy WD drives)
 *  Version 3.13        remove excess "multiple mode disabled" messages
 *  Version 3.14        fix ide_error() handling of BUSY_STAT
 *                      fix byte-swapped cdrom strings (again.. arghh!)
 *                      ignore INDEX bit when checking the ALTSTATUS reg
 *  Version 3.15        add SINGLE_THREADED flag for use with dual-CMD i/f
 *                      ignore WRERR_STAT for non-write operations
 *                      added vlb_sync support for DC-2000A & others,
 *                       (incl. some Promise chips), courtesy of Frank Gockel
 *  Version 3.16        convert vlb_32bit and vlb_sync into runtime flags
 *                      add ioctls to get/set VLB flags (HDIO_[SG]ET_CHIPSET)
 *                      rename SINGLE_THREADED to SUPPORT_SERIALIZE,
 *                      add boot flag to "serialize" operation for CMD i/f
 *                      add optional support for DTC2278 interfaces,
 *                       courtesy of andy@cercle.cts.com (Dyan Wile).
 *                      add boot flag to enable "dtc2278" probe
 *                      add probe to avoid EATA (SCSI) interfaces,
 *                       courtesy of neuffer@goofy.zdv.uni-mainz.de.
 *  Version 4.00        tidy up verify_area() calls - heiko@colossus.escape.de
 *                      add flag to ignore WRERR_STAT for some drives
 *                       courtesy of David.H.West@um.cc.umich.edu
 *                      assembly syntax tweak to vlb_sync
 *                      removable drive support from scuba@cs.tu-berlin.de
 *                      add transparent support for DiskManager-6.0x "Dynamic
 *                       Disk Overlay" (DDO), most of this is in genhd.c
 *                      eliminate "multiple mode turned off" message at boot
 *  Version 4.10        fix bug in ioctl for "hdparm -c3"
 *                      fix DM6:DDO support -- now works with LILO, fdisk, ...
 *                      don't treat some naughty WD drives as removable
 *  Version 4.11        updated DM6 support using info provided by OnTrack
 *  Version 5.00        major overhaul, multmode setting fixed, vlb_sync fixed
 *                      added support for 3rd/4th/alternative IDE ports
 *                      created ide.h; ide-cd.c now compiles separate from ide.c
 *                      hopefully fixed infinite "unexpected_intr" from cdroms
 *                      zillions of other changes and restructuring
 *                      somehow reduced overall memory usage by several kB
 *                      probably slowed things down slightly, but worth it
 *  Version 5.01        AT LAST!!  Finally understood why "unexpected_intr"
 *                       was happening at various times/places:  whenever the
 *                       ide-interface's ctl_port was used to "mask" the irq,
 *                       it also would trigger an edge in the process of masking
 *                       which would result in a self-inflicted interrupt!!
 *                       (such a stupid way to build a hardware interrupt mask).
 *                       This is now fixed (after a year of head-scratching).
 *  Version 5.02        got rid of need for {enable,disable}_irq_list()
 *  Version 5.03        tune-ups, comments, remove "busy wait" from drive resets
 *                      removed PROBE_FOR_IRQS option -- no longer needed
 *                      OOOPS!  fixed "bad access" bug for 2nd drive on an i/f
 *  Version 5.04        changed "ira %d" to "irq %d" in DEBUG message
 *                      added more comments, cleaned up unexpected_intr()
 *                      OOOPS!  fixed null pointer problem in ide reset code
 *                      added autodetect for Triton chipset -- no effect yet
 *  Version 5.05        OOOPS!  fixed bug in revalidate_disk()
 *                      OOOPS!  fixed bug in ide_do_request()
 *                      added ATAPI reset sequence for cdroms
 *  Version 5.10        added Bus-Mastered DMA support for Triton Chipset
 *                      some (mostly) cosmetic changes
 *  Version 5.11        added ht6560b support by malafoss@snakemail.hut.fi
 *                      reworked PCI scanning code
 *                      added automatic RZ1000 detection/support
 *                      added automatic PCI CMD640 detection/support
 *                      added option for VLB CMD640 support
 *                      tweaked probe to find cdrom on hdb with disks on hda,hdc
 *  Version 5.12        some performance tuning
 *                      added message to alert user to bad /dev/hd[cd] entries
 *                      OOOPS!  fixed bug in atapi reset
 *                      driver now forces "serialize" again for all cmd640 chips
 *                      noticed REALLY_SLOW_IO had no effect, moved it to ide.c
 *                      made do_drive_cmd() into public ide_do_drive_cmd()
 *  Version 5.13        fixed typo ('B'), thanks to houston@boyd.geog.mcgill.ca
 *                      fixed ht6560b support
 *  Version 5.13b (sss) fix problem in calling ide_cdrom_setup()
 *                      don't bother invalidating nonexistent partitions
 *  Version 5.14        fixes to cmd640 support.. maybe it works now(?)
 *                      added & tested full EZ-DRIVE support -- don't use LILO!
 *                      don't enable 2nd CMD640 PCI port during init - conflict
 *  Version 5.15        bug fix in init_cmd640_vlb()
 *                      bug fix in interrupt sharing code
 *  Version 5.16        ugh.. fix "serialize" support, broken in 5.15
 *                      remove "Huh?" from cmd640 code
 *                      added qd6580 interface speed select from Colten Edwards
 *  Version 5.17        kludge around bug in BIOS32 on Intel triton motherboards
 *  Version 5.18        new CMD640 code, moved to cmd640.c, #include'd for now
 *                      new UMC8672 code, moved to umc8672.c, #include'd for now
 *                      disallow turning on DMA when h/w not capable of DMA
 *  Version 5.19        fix potential infinite timeout on resets
 *                      extend reset poll into a general purpose polling scheme
 *                      add atapi tape drive support from Gadi Oxman
 *                      simplify exit from _intr routines -- no IDE_DO_REQUEST
 *  Version 5.20        leave current rq on blkdev request list during I/O
 *                      generalized ide_do_drive_cmd() for tape/cdrom driver use
 *  Version 5.21        fix nasty cdrom/tape bug (ide_preempt was messed up)
 *  Version 5.22        fix ide_xlate_1024() to work with/without drive->id
 *  Version 5.23        miscellaneous touch-ups
 *  Version 5.24        fix #if's for SUPPORT_CMD640
 *  Version 5.25        more touch-ups, fix cdrom resets, ...
 *                      cmd640.c now configs/compiles separate from ide.c
 *  Version 5.26        keep_settings now maintains the using_dma flag
 *                      fix [EZD] remap message to only output at boot time
 *                      fix "bad /dev/ entry" message to say hdc, not hdc0
 *                      fix ide_xlate_1024() to respect user specified CHS
 *                      use CHS from partn table if it looks translated
 *                      re-merged flags chipset,vlb_32bit,vlb_sync into io_32bit
 *                      keep track of interface chipset type, when known
 *                      add generic PIO mode "tuneproc" mechanism
 *                      fix cmd640_vlb option
 *                      fix ht6560b support (was completely broken)
 *                      umc8672.c now configures/compiles separate from ide.c
 *                      move dtc2278 support to dtc2278.c
 *                      move ht6560b support to ht6560b.c
 *                      move qd6580  support to qd6580.c
 *                      add  ali14xx support in ali14xx.c
 * Version 5.27         add [no]autotune parameters to help cmd640
 *                      move rz1000  support to rz1000.c
 * Version 5.28         #include "ide_modes.h"
 *                      fix disallow_unmask: now per-interface "no_unmask" bit
 *                      force io_32bit to be the same on drive pairs of dtc2278
 *                      improved IDE tape error handling, and tape DMA support
 *                      bugfix in ide_do_drive_cmd() for cdroms + serialize
 * Version 5.29         fixed non-IDE check for too many physical heads
 *                      don't use LBA if capacity is smaller than CHS
 * Version 5.30         remove real_devices kludge, formerly used by genhd.c
 * Version 5.32         change "KB" to "kB"
 *                      fix serialize (was broken in kernel 1.3.72)
 *                      add support for "hdparm -I"
 *                      use common code for disk/tape/cdrom IDE_DRIVE_CMDs
 *                      add support for Promise DC4030VL caching card
 *                      improved serialize support
 *                      put partition check back into alphabetical order
 *                      add config option for PCMCIA baggage
 *                      try to make PCMCIA support safer to use
 *                      improve security on ioctls(): all are suser() only
 * Version 5.33         improve handling of HDIO_DRIVE_CMDs that read data
 * Version 5.34         fix irq-sharing problem from 5.33
 *                      fix cdrom ioctl problem from 5.33
 * Version 5.35         cosmetic changes
 *                      fix cli() problem in try_to_identify()
 * Version 5.36         fixes to optional PCMCIA support
 * Version 5.37         don't use DMA when "noautotune" is specified
 * Version 5.37a (go)   fix shared irq probing (was broken in kernel 1.3.72)
 *                      call unplug_device() from ide_do_drive_cmd()
 * Version 5.38         add "hdx=none" option, courtesy of Joel Maslak
 *                      mask drive irq after use, if sharing with another hwif
 *                      add code to help debug weird cmd640 problems
 * Version 5.39         fix horrible error in earlier irq sharing "fix"
 * Version 5.40         fix serialization -- was broken in 5.39
 *                      help sharing by masking device irq after probing
 * Version 5.41         more fixes to irq sharing/serialize detection
 *                      disable io_32bit by default on drive reset
 * Version 5.42         simplify irq-masking after probe
 *                      fix NULL pointer deref in save_match()
 * Version 5.43         Ugh.. unexpected_intr is back: try to exterminate it
 * Version 5.44         Fix for "irq probe failed" on cmd640
 *                      change path on message regarding MAKEDEV.ide
 *                      add a throttle to the unexpected_intr() messages
 * Version 5.45         fix ugly parameter parsing bugs (thanks Derek)
 *                      include Gadi's magic fix for cmd640 unexpected_intr
 *                      include mc68000 patches from Geert Uytterhoeven
 *                      add Gadi's fix for PCMCIA cdroms
 * Version 5.46         remove the mc68000 #ifdefs for 2.0.x
 * Version 5.47         fix set_tune race condition
 *                      fix bug in earlier PCMCIA cdrom update
 * Version 5.48         if def'd, invoke CMD640_DUMP_REGS when irq probe fails
 *                      lengthen the do_reset1() pulse, for laptops
 *                      add idebus=xx parameter for cmd640 and ali chipsets
 *                      no_unmask flag now per-drive instead of per-hwif
 *                      fix tune_req so that it gets done immediately
 *                      fix missing restore_flags() in ide_ioctl
 *                      prevent use of io_32bit on cmd640 with no prefetch
 * Version 5.49         fix minor quirks in probing routines
 * 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 5.53         add ATAPI floppy drive support
 *                      change default media for type 0 to floppy
 *                      add support for Exabyte Nest
 *                      add missing set_blocksize() in revalidate_disk()
 *                      handle bad status bit sequencing in ide_wait_stat()
 *                      support partition table translations with 255 heads
 *                      probe all interfaces by default
 *                      add probe for the i82371AB chipset
 *                      acknowledge media change on removable drives
 *                      add work-around for BMI drives
 *                      remove "LBA" from boot messages
 * Version 5.53.1       add UDMA "CRC retry" support
 * Version 5.53.2       add Promise/33 auto-detection and DMA support
 *                      fix MC_ERR handling
 *                      fix mis-detection of NEC cdrom as floppy
 *                      issue ATAPI reset and re-probe after "no response"
 *
 *--------------------------------------------------------------------------------
 *  Ported to ARM architecture by Russell King (rmk@ecs.soton.ac.uk)
 *--------------------------------------------------------------------------------
 *  Some additional driver compile-time options are in ide.h
 *
 *  To do, in likely order of completion:
 *      - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
 */
 
#undef REALLY_SLOW_IO           /* most systems can safely undef this */
 
#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/genhd.h>
#include <linux/malloc.h>
 
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/segment.h>
#include <asm/io.h>
 
#ifdef CONFIG_PCI
#include <linux/bios32.h>
#include <linux/pci.h>
#endif /* CONFIG_PCI */
 
#include "ide.h"
#include "ide_modes.h"
 
#ifdef CONFIG_BLK_DEV_PROMISE
#include "promise.h"
#define IS_PROMISE_DRIVE (HWIF(drive)->chipset == ide_promise)
#else
#define IS_PROMISE_DRIVE (0)    /* auto-NULLs out Promise code */
#endif /* CONFIG_BLK_DEV_PROMISE */
 
static const byte       ide_hwif_to_major[MAX_HWIFS] = {IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR};
#if defined(CONFIG_ARCH_RPC)
static const unsigned long default_io_base[MAX_HWIFS] = {0x1f0};
static const byte       default_irqs[MAX_HWIFS]     = {9};
#elif defined (CONFIG_ARCH_A5K)
static const unsigned long default_io_base[MAX_HWIFS] = {0x1f0};
static const byte       default_irqs[MAX_HWIFS]     = {11};
#else
static const unsigned long default_io_base[MAX_HWIFS] = {0};
static const byte       default_irqs[MAX_HWIFS]     = {0};
#endif
 
static int      idebus_parameter; /* holds the "idebus=" parameter */
static int      system_bus_speed; /* holds what we think is VESA/PCI bus speed */
 
/*
 * 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)
#error DISK_RECOVERY_TIME is not supported on the ARM.
/*
 * 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);
        cli();
        t = jiffies * 11932;
        outb_p(0, 0x43);
        i = inb_p(0x40);
        i |= inb(0x40) << 8;
        restore_flags(flags);
        return (t - i);
}
 
static void set_recovery_timer (ide_hwif_t *hwif)
{
        hwif->last_time = read_timer();
}
#define SET_RECOVERY_TIMER(drive) set_recovery_timer (drive)
 
#else
 
#define SET_RECOVERY_TIMER(drive)
 
#endif /* DISK_RECOVERY_TIME */
 
 
/*
 * Do not even *think* about calling this!
 */
static void init_hwif_data (unsigned int index)
{
        byte *p;
        unsigned int unit;
        ide_hwif_t *hwif = &ide_hwifs[index];
 
        /* bulk initialize hwif & drive info with zeros */
        p = ((byte *) hwif) + sizeof(ide_hwif_t);
        do {
                *--p = 0;
        } while (p > (byte *) hwif);
 
        /* fill in any non-zero initial values */
        hwif->index     = index;
        hwif->io.io_base        = default_io_base[index];
        hwif->io.ctl_port       = hwif->io.io_base ? hwif->io.io_base+0x206 : 0x000;
        hwif->io.io_shift       = 0;
#ifdef CONFIG_BLK_DEV_HD
        if (hwif->io.io_base == HD_DATA)
                hwif->noprobe = 1; /* may be overridden by ide_setup() */
#endif /* CONFIG_BLK_DEV_HD */
        /* RMK: do not probe ifs set at address 0 */
        if (hwif->io.io_base == 0)
                hwif->noprobe = 1;
        hwif->major     = ide_hwif_to_major[index];
        hwif->name[0]    = 'i';
        hwif->name[1]   = 'd';
        hwif->name[2]   = 'e';
        hwif->name[3]   = '0' + index;
#ifdef CONFIG_BLK_DEV_IDETAPE
        hwif->tape_drive = NULL;
#endif /* CONFIG_BLK_DEV_IDETAPE */
        for (unit = 0; unit < MAX_DRIVES; ++unit) {
                ide_drive_t *drive = &hwif->drives[unit];
 
                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;
        }
}
 
/*
 * 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_ide_data (void)
{
        unsigned int index;
        static unsigned long magic_cookie = MAGIC_COOKIE;
 
        if (magic_cookie != MAGIC_COOKIE)
                return;         /* already initialized */
        magic_cookie = 0;
 
        for (index = 0; index < MAX_HWIFS; ++index)
                init_hwif_data(index);
 
        idebus_parameter = 0;
        system_bus_speed = 0;
}
 
/*
 * 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 (pcibios_present())
                        system_bus_speed = 40;  /* 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; override with idebus=xx\n", system_bus_speed);
        }
        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 (unsigned short 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)
{
        unsigned long io_base  = HWIF(drive)->io.io_base;
        unsigned long data_reg = io_base + (IDE_DATA_OFFSET << HWIF(drive)->io.io_shift);
#ifndef __arm__
        byte io_32bit = drive->io_32bit;
#else
        byte io_32bit = 0;
#endif
 
        if (io_32bit) {
#if SUPPORT_VLB_SYNC
                if (io_32bit & 2) {
                        cli();
                        do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
                        insl(data_reg, buffer, wcount);
                        if (drive->unmask)
                                sti();
                } else
#endif /* SUPPORT_VLB_SYNC */
                        insl(data_reg, buffer, wcount);
        } else {
#if SUPPORT_SLOW_DATA_PORTS
                if (drive->slow) {
                        unsigned short *ptr = (unsigned short *) buffer;
                        while (wcount--) {
                                *ptr++ = inw_p(data_reg);
                                *ptr++ = inw_p(data_reg);
                        }
                } else
#endif /* SUPPORT_SLOW_DATA_PORTS */
                        insw(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)
{
        unsigned long io_base  = HWIF(drive)->io.io_base;
        unsigned long data_reg = io_base + (IDE_DATA_OFFSET << HWIF(drive)->io.io_shift);
#ifndef __arm__
        byte io_32bit = drive->io_32bit;
#else
        byte io_32bit = 0;
#endif
 
        if (io_32bit) {
#if SUPPORT_VLB_SYNC
                if (io_32bit & 2) {
                        cli();
                        do_vlb_sync(io_base+IDE_NSECTOR_OFFSET);
                        outsl(data_reg, buffer, wcount);
                        if (drive->unmask)
                                sti();
                } else
#endif /* SUPPORT_VLB_SYNC */
                        outsl(data_reg, buffer, wcount);
        } else {
#if SUPPORT_SLOW_DATA_PORTS
                if (drive->slow) {
                        unsigned short *ptr = (unsigned short *) buffer;
                        while (wcount--) {
                                outw_p(*ptr++, data_reg);
                                outw_p(*ptr++, data_reg);
                        }
                } else
#endif /* SUPPORT_SLOW_DATA_PORTS */
                        outsw(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)
{
        ++bytecount;
        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)
{
        ++bytecount;
        ide_output_data (drive, buffer, bytecount / 4);
        if ((bytecount & 0x03) >= 2)
                outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
}
 
/*
 * 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 timer_expiry() handler later on).
 */
void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout)
{
        ide_hwgroup_t *hwgroup = HWGROUP(drive);
#ifdef DEBUG
        if (hwgroup->handler != NULL) {
                printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
                        drive->name, hwgroup->handler, handler);
        }
#endif
        hwgroup->handler       = handler;
        hwgroup->timer.expires = jiffies + timeout;
        add_timer(&(hwgroup->timer));
}
 
/*
 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
 * value for this drive (from its reported identification information).
 *
 * Returns:     1 if lba_capacity looks sensible
 *              0 otherwise
 */
static int lba_capacity_is_ok (struct hd_driveid *id)
{
        unsigned long lba_sects   = id->lba_capacity;
        unsigned long chs_sects   = id->cyls * id->heads * id->sectors;
        unsigned long _10_percent = chs_sects / 10;
 
        /* very large drives (8GB+) may lie about the number of cylinders */
        if (id->cyls == 16383 && id->heads == 16 && id->sectors == 63 && lba_sects > chs_sects) {
                id->cyls = lba_sects / (16 * 63); /* correct cyls */
                return 1;       /* lba_capacity is our only option */
        }
        /* perform a rough sanity check on lba_sects:  within 10% is "okay" */
        if ((lba_sects - chs_sects) < _10_percent)
                return 1;       /* lba_capacity is good */
 
        /* some drives have the word order reversed */
        lba_sects = (lba_sects << 16) | (lba_sects >> 16);
        if ((lba_sects - chs_sects) < _10_percent) {
                id->lba_capacity = lba_sects;   /* fix it */
                return 1;       /* lba_capacity is (now) good */
        }
        return 0;        /* lba_capacity value is bad */
}
 
/*
 * current_capacity() returns the capacity (in sectors) of a drive
 * according to its current geometry/LBA settings.
 */
static unsigned long current_capacity (ide_drive_t  *drive)
{
        struct hd_driveid *id = drive->id;
        unsigned long capacity = drive->cyl * drive->head * drive->sect;
 
        if (!drive->present)
                return 0;
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
        if (drive->media == ide_floppy)
                return idefloppy_capacity(drive);
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
        if (drive->media != ide_disk)
                return 0x7fffffff;      /* cdrom or tape */
        drive->select.b.lba = 0;
        /* Determine capacity, and use LBA if the drive properly supports it */
        if (id != NULL && (id->capability & 2) && lba_capacity_is_ok(id)) {
                if (id->lba_capacity >= capacity) {
                        drive->cyl = id->lba_capacity / (drive->head * drive->sect);
                        capacity = id->lba_capacity;
                        drive->select.b.lba = 1;
                }
        }
        return (capacity - drive->sect0);
}
 
/*
 * ide_geninit() is called exactly *once* for each major, from genhd.c,
 * at the beginning of the initial partition check for the drives.
 */
static void ide_geninit (struct gendisk *gd)
{
        unsigned int unit;
        ide_hwif_t *hwif = gd->real_devices;
 
        for (unit = 0; unit < gd->nr_real; ++unit) {
                ide_drive_t *drive = &hwif->drives[unit];
#ifdef CONFIG_BLK_DEV_IDECD
                if (drive->present && drive->media == ide_cdrom)
                        ide_cdrom_setup(drive);
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
                if (drive->present && drive->media == ide_tape)
                        idetape_setup(drive);
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                if (drive->present && drive->media == ide_floppy)
                        idefloppy_setup(drive);
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
                drive->part[0].nr_sects = current_capacity(drive);
                if (!drive->present || (drive->media != ide_disk && drive->media != ide_floppy) ||
                    !drive->part[0].nr_sects) {
                        drive->part[0].start_sect = -1; /* skip partition check */
                }
        }
}
 
/*
 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
 * after probing for drives, to allocate partition tables and other data
 * structures needed for the routines in genhd.c.  ide_geninit() gets called
 * somewhat later, during the partition check.
 */
static void init_gendisk (ide_hwif_t *hwif)
{
        struct gendisk *gd, **gdp;
        unsigned int unit, units, minors;
        int *bs;
 
        /* figure out maximum drive number on the interface */
        for (units = MAX_DRIVES; units > 0; --units) {
                if (hwif->drives[units-1].present)
                        break;
        }
        minors    = units * (1<<PARTN_BITS);
        gd        = kmalloc (sizeof(struct gendisk), GFP_KERNEL);
        gd->sizes = kmalloc (minors * sizeof(int), GFP_KERNEL);
        gd->part  = kmalloc (minors * sizeof(struct hd_struct), GFP_KERNEL);
        bs        = kmalloc (minors*sizeof(int), GFP_KERNEL);
 
        memset(gd->part, 0, minors * sizeof(struct hd_struct));
 
        /* cdroms and msdos f/s are examples of non-1024 blocksizes */
        blksize_size[hwif->major] = bs;
        for (unit = 0; unit < minors; ++unit)
                *bs++ = BLOCK_SIZE;
 
        for (unit = 0; unit < units; ++unit)
                hwif->drives[unit].part = &gd->part[unit << PARTN_BITS];
 
        gd->major       = hwif->major;          /* our major device number */
        gd->major_name  = IDE_MAJOR_NAME;       /* treated special in genhd.c */
        gd->minor_shift = PARTN_BITS;           /* num bits for partitions */
        gd->max_p       = 1<<PARTN_BITS;        /* 1 + max partitions / drive */
        gd->max_nr      = units;                /* max num real drives */
        gd->nr_real     = units;                /* current num real drives */
        gd->init        = ide_geninit;          /* initialization function */
        gd->real_devices= hwif;                 /* ptr to internal data */
        gd->next        = NULL;                 /* linked list of major devs */
 
        for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next)) ;
        hwif->gd = *gdp = gd;                   /* link onto tail of list */
}
 
static void do_reset1 (ide_drive_t *, int);             /* needed below */
 
#ifdef CONFIG_BLK_DEV_IDEATAPI
/*
 * 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 void atapi_reset_pollfunc (ide_drive_t *drive)
{
        ide_hwgroup_t *hwgroup = HWGROUP(drive);
        byte stat;
 
        OUT_BYTE (drive->select.all, IDE_SELECT_REG);
        udelay (10);
 
        if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
                printk("%s: ATAPI reset complete\n", drive->name);
        } else {
                if (jiffies < hwgroup->poll_timeout) {
                        ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
                        return; /* continue polling */
                }
                hwgroup->poll_timeout = 0;       /* end of polling */
                printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
                do_reset1 (drive, 1);   /* do it the old fashioned way */
                return;
        }
        hwgroup->poll_timeout = 0;       /* done polling */
}
#endif /* CONFIG_BLK_DEV_IDEATAPI */
 
/*
 * 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 void 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 (jiffies < hwgroup->poll_timeout) {
                        ide_set_handler (drive, &reset_pollfunc, HZ/20);
                        return; /* continue polling */
                }
                printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
        } else  {
                printk("%s: reset: ", hwif->name);
                if ((tmp = GET_ERR()) == 1)
                        printk("success\n");
                else {
#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 */
}
 
/*
 * 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 void 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);
        cli();          /* Why ? */
 
#ifdef CONFIG_BLK_DEV_IDEATAPI
        /* For an ATAPI device, first try an ATAPI SRST. */
        if (drive->media != ide_disk) {
                if (!do_not_try_atapi) {
                        if (!drive->keep_settings) {
                                drive->unmask = 0;
                                drive->io_32bit = 0;
                        }
                        OUT_BYTE (drive->select.all, IDE_SELECT_REG);
                        udelay (20);
                        OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
                        hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
                        ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20);
                        restore_flags (flags);
                        return;
                }
        }
#endif /* CONFIG_BLK_DEV_IDEATAPI */
 
        /*
         * First, reset any device state data we were maintaining
         * for any of the drives on this interface.
         */
        for (unit = 0; unit < MAX_DRIVES; ++unit) {
                ide_drive_t *rdrive = &hwif->drives[unit];
#ifdef CONFIG_BLK_DEV_IDETAPE
                if (rdrive->media == ide_tape)
                        rdrive->tape.reset_issued = 1;
#endif /* CONFIG_BLK_DEV_IDETAPE */
                rdrive->special.all = 0;
                rdrive->special.b.set_geometry = 1;
                rdrive->special.b.recalibrate  = 1;
                if (OK_TO_RESET_CONTROLLER)
                        rdrive->mult_count = 0;
                if (!rdrive->keep_settings) {
                        rdrive->mult_req = 0;
                        rdrive->unmask = 0;
                        rdrive->io_32bit = 0;
                        if (rdrive->using_dma) {
                                rdrive->using_dma = 0;
                                printk("%s: disabled DMA\n", rdrive->name);
                        }
                }
                if (rdrive->mult_req != rdrive->mult_count)
                        rdrive->special.b.set_multmode = 1;
        }
 
#if OK_TO_RESET_CONTROLLER
        /*
         * 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);
#endif  /* OK_TO_RESET_CONTROLLER */
 
        restore_flags (flags);
}
 
/*
 * ide_do_reset() is the entry point to the drive/interface reset code.
 */
void ide_do_reset (ide_drive_t *drive)
{
        do_reset1 (drive, 0);
#ifdef CONFIG_BLK_DEV_IDETAPE
        if (drive->media == ide_tape)
                drive->tape.reset_issued=1;
#endif /* CONFIG_BLK_DEV_IDETAPE */
}
 
/*
 * 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 = HWGROUP(drive)->rq;
 
        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);
                }
        }
        save_flags(flags);
        cli();
        blk_dev[MAJOR(rq->rq_dev)].current_request = rq->next;
        HWGROUP(drive)->rq = NULL;
        rq->rq_status = RQ_INACTIVE;
        if (rq->sem != NULL)
                up(rq->sem);
        restore_flags(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);
        sti();
        printk("%s: %s: status=0x%02x", drive->name, msg, stat);
#if FANCY_STATUS_DUMPS
        if (drive->media == ide_disk) {
                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 & BBD_ERR)      printk("BadSector ");
                        if (err & ECC_ERR)      printk("UncorrectableError ");
                        if (err & ID_ERR)       printk("SectorIdNotFound ");
                        if (err & ABRT_ERR)     printk("DriveStatusError ");
                        if (err & TRK0_ERR)     printk("TrackZeroNotFound ");
                        if (err & MARK_ERR)     printk("AddrMarkNotFound ");
                        printk("}");
                        if (err & (BBD_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)->rq)
                                        printk(", sector=%ld", HWGROUP(drive)->rq->sector);
                        }
                }
#endif  /* FANCY_STATUS_DUMPS */
                printk("\n");
        }
        restore_flags (flags);
        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;
 
        while (i > 0) {
                unsigned long 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 controller.
 */
void ide_error (ide_drive_t *drive, const char *msg, byte stat)
{
        struct request *rq;
        byte err;
 
        err = ide_dump_status(drive, msg, stat);
        if ((rq = HWGROUP(drive)->rq) == NULL || drive == NULL)
                return;
        /* retry only "normal" I/O: */
        if (rq->cmd == IDE_DRIVE_CMD) {
                rq->errors = 1;
                ide_end_drive_cmd(drive, stat, err);
                return;
        }
        if (stat & BUSY_STAT) {         /* 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; /* some newer drives don't support WIN_SPECIFY */
                        } else if ((err & (ABRT_ERR | ICRC_ERR)) == (ABRT_ERR | ICRC_ERR))
                                ; /* 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;
                        else if (err & MC_ERR)
                                drive->special.b.mc = 1;
                }
                if ((stat & DRQ_STAT) && rq->cmd != WRITE)
                        try_to_flush_leftover_data(drive);
        }
        if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
                rq->errors |= ERROR_RESET;      /* Mmmm.. timing problem */
 
        if (rq->errors >= ERROR_MAX) {
#ifdef CONFIG_BLK_DEV_IDETAPE
                if (drive->media == ide_tape) {
                        rq->errors = 0;
                        idetape_end_request(0, HWGROUP(drive));
                } else
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                if (drive->media == ide_floppy) {
                        rq->errors = 0;
                        idefloppy_end_request(0, HWGROUP(drive));
                } else
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
                if (drive->media == ide_scsi) {
                        rq->errors = 0;
                        idescsi_end_request(0, HWGROUP(drive));
                } else
#endif /* CONFIG_BLK_DEV_IDESCSI */
                ide_end_request(0, HWGROUP(drive));
        }
        else {
                if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
                        ++rq->errors;
                        ide_do_reset(drive);
                        return;
                } else if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
                        drive->special.b.recalibrate = 1;
                ++rq->errors;
        }
}
 
/*
 * read_intr() is the handler for disk read/multread interrupts
 */
static void read_intr (ide_drive_t *drive)
{
        byte stat;
        int i;
        unsigned int msect, nsect;
        struct request *rq;
 
        if (!OK_STAT(stat=GET_STAT(),DATA_READY,BAD_R_STAT)) {
                ide_error(drive, "read_intr", stat);
                return;
        }
        msect = drive->mult_count;
read_next:
        rq = HWGROUP(drive)->rq;
        if (msect) {
                if ((nsect = rq->current_nr_sectors) > msect)
                        nsect = msect;
                msect -= nsect;
        } else
                nsect = 1;
        ide_input_data(drive, rq->buffer, nsect * SECTOR_WORDS);
#ifdef DEBUG
        printk("%s:  read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
                drive->name, rq->sector, rq->sector+nsect-1,
                (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
#endif
        rq->sector += nsect;
        rq->buffer += nsect<<9;
        rq->errors = 0;
        i = (rq->nr_sectors -= nsect);
        if ((rq->current_nr_sectors -= nsect) <= 0)
                ide_end_request(1, HWGROUP(drive));
        if (i > 0) {
                if (msect)
                        goto read_next;
                ide_set_handler (drive, &read_intr, WAIT_CMD);
        }
}
 
/*
 * write_intr() is the handler for disk write interrupts
 */
static void write_intr (ide_drive_t *drive)
{
        byte stat;
        int i;
        ide_hwgroup_t *hwgroup = HWGROUP(drive);
        struct request *rq = hwgroup->rq;
 
        if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
#ifdef DEBUG
                printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
                        drive->name, rq->sector, (unsigned long) rq->buffer,
                        rq->nr_sectors-1);
#endif
                if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
                        rq->sector++;
                        rq->buffer += 512;
                        rq->errors = 0;
                        i = --rq->nr_sectors;
                        --rq->current_nr_sectors;
                        if (rq->current_nr_sectors <= 0)
                                ide_end_request(1, hwgroup);
                        if (i > 0) {
                                ide_output_data (drive, rq->buffer, SECTOR_WORDS);
                                ide_set_handler (drive, &write_intr, WAIT_CMD);
                        }
                        return;
                }
        }
        ide_error(drive, "write_intr", stat);
}
 
/*
 * ide_multwrite() transfers a block of up to mcount sectors of data
 * to a drive as part of a disk multiple-sector write operation.
 */
void ide_multwrite (ide_drive_t *drive, unsigned int mcount)
{
        struct request *rq = &HWGROUP(drive)->wrq;
 
        do {
                unsigned int nsect = rq->current_nr_sectors;
                if (nsect > mcount)
                        nsect = mcount;
                mcount -= nsect;
 
                ide_output_data(drive, rq->buffer, nsect<<7);
#ifdef DEBUG
                printk("%s: multwrite: sector %ld, buffer=0x%08lx, count=%d, remaining=%ld\n",
                        drive->name, rq->sector, (unsigned long) rq->buffer,
                        nsect, rq->nr_sectors - nsect);
#endif
                if ((rq->nr_sectors -= nsect) <= 0)
                        break;
                if ((rq->current_nr_sectors -= nsect) == 0) {
                        if ((rq->bh = rq->bh->b_reqnext) != NULL) {
                                rq->current_nr_sectors = rq->bh->b_size>>9;
                                rq->buffer             = rq->bh->b_data;
                        } else {
                                panic("%s: buffer list corrupted\n", drive->name);
                                break;
                        }
                } else {
                        rq->buffer += nsect << 9;
                }
        } while (mcount);
}
 
/*
 * multwrite_intr() is the handler for disk multwrite interrupts
 */
static void multwrite_intr (ide_drive_t *drive)
{
        byte stat;
        int i;
        ide_hwgroup_t *hwgroup = HWGROUP(drive);
        struct request *rq = &hwgroup->wrq;
 
        if (OK_STAT(stat=GET_STAT(),DRIVE_READY,drive->bad_wstat)) {
                if (stat & DRQ_STAT) {
                        if (rq->nr_sectors) {
                                ide_multwrite(drive, drive->mult_count);
                                ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
                                return;
                        }
                } else {
                        if (!rq->nr_sectors) {  /* all done? */
                                rq = hwgroup->rq;
                                for (i = rq->nr_sectors; i > 0;){
                                        i -= rq->current_nr_sectors;
                                        ide_end_request(1, hwgroup);
                                }
                                return;
                        }
                }
        }
        ide_error(drive, "multwrite_intr", stat);
}
 
/*
 * Issue a simple drive command
 * The drive must be selected beforehand.
 */
static void ide_cmd(ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
{
        ide_set_handler (drive, handler, WAIT_CMD);
        OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
        OUT_BYTE(nsect,IDE_NSECTOR_REG);
        OUT_BYTE(cmd,IDE_COMMAND_REG);
}
 
/*
 * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd.
 */
static void set_multmode_intr (ide_drive_t *drive)
{
        byte stat = GET_STAT();
 
        sti();
        if (OK_STAT(stat,READY_STAT,BAD_STAT)) {
                drive->mult_count = drive->mult_req;
        } else {
                drive->mult_req = drive->mult_count = 0;
                drive->special.b.recalibrate = 1;
                (void) ide_dump_status(drive, "set_multmode", stat);
        }
}
 
/*
 * set_geometry_intr() is invoked on completion of a WIN_SPECIFY cmd.
 */
static void set_geometry_intr (ide_drive_t *drive)
{
        byte stat = GET_STAT();
 
        sti();
        if (!OK_STAT(stat,READY_STAT,BAD_STAT))
                ide_error(drive, "set_geometry_intr", stat);
}
 
/*
 * recal_intr() is invoked on completion of a WIN_RESTORE (recalibrate) cmd.
 */
static void recal_intr (ide_drive_t *drive)
{
        byte stat = GET_STAT();
 
        sti();
        if (!OK_STAT(stat,READY_STAT,BAD_STAT))
                ide_error(drive, "recal_intr", stat);
}
 
/*
 * mc_intr() is invoked on completion of a WIN_ACKMC cmd.
 */
static void mc_intr (ide_drive_t *drive)
{
        byte stat = GET_STAT();
 
        sti();
        if (!OK_STAT(stat,READY_STAT,BAD_STAT))
                ide_error(drive, "mc_intr", stat);
        drive->special.b.mc = 0;
}
 
/*
 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
 */
static void drive_cmd_intr (ide_drive_t *drive)
{
        struct request *rq = HWGROUP(drive)->rq;
        byte *args = (byte *) rq->buffer;
        byte stat = GET_STAT();
 
        sti();
        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;
                stat = GET_STAT();
        }
        if (OK_STAT(stat,READY_STAT,BAD_STAT))
                ide_end_drive_cmd (drive, stat, GET_ERR());
        else
                ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
}
 
/*
 * 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 inline void 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_geometry) {
                s->b.set_geometry = 0;
                if (drive->media == ide_disk && !drive->no_geom) {
                        OUT_BYTE(drive->sect,IDE_SECTOR_REG);
                        OUT_BYTE(drive->cyl,IDE_LCYL_REG);
                        OUT_BYTE(drive->cyl>>8,IDE_HCYL_REG);
                        OUT_BYTE(((drive->head-1)|drive->select.all)&0xBF,IDE_SELECT_REG);
                        if (!IS_PROMISE_DRIVE)
                                ide_cmd(drive, WIN_SPECIFY, drive->sect, &set_geometry_intr);
                }
        } else if (s->b.recalibrate) {
                s->b.recalibrate = 0;
                if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
                        ide_cmd(drive, WIN_RESTORE, drive->sect, &recal_intr);
        } else 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 (s->b.set_multmode) {
                s->b.set_multmode = 0;
                if (drive->media == ide_disk) {
                        if (drive->id && drive->mult_req > drive->id->max_multsect)
                                drive->mult_req = drive->id->max_multsect;
                        if (!IS_PROMISE_DRIVE)
                                ide_cmd(drive, WIN_SETMULT, drive->mult_req, &set_multmode_intr);
                } else
                        drive->mult_req = 0;
        } else if (s->b.mc) {
                s->b.mc = 0;
                if (drive->media == ide_disk && !IS_PROMISE_DRIVE)
                        ide_cmd(drive, WIN_ACKMC, drive->sect, &mc_intr);
        } else if (s->all) {
                int special = s->all;
                s->all = 0;
                printk("%s: bad special flag: 0x%02x\n", drive->name, special);
        }
}
 
/*
 * 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_drive_t *drive, byte good, byte bad, unsigned long timeout)
{
        byte stat;
        unsigned long flags;
 
        udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
        if ((stat = GET_STAT()) & BUSY_STAT) {
                save_flags(flags);
                sti();
                timeout += jiffies;
                while ((stat = GET_STAT()) & BUSY_STAT) {
                        if (jiffies > timeout) {
                                restore_flags(flags);
                                ide_error(drive, "status timeout", stat);
                                return 1;
                        }
                }
                restore_flags(flags);
        }
        udelay(1);      /* allow status to settle, then read it again */
        if (OK_STAT((stat = GET_STAT()), good, bad))
                return 0;
        ide_error(drive, "status error", stat);
        return 1;
}
 
/*
 * do_rw_disk() issues READ and WRITE commands to a disk,
 * using LBA if supported, or CHS otherwise, to address sectors.
 * It also takes care of issuing special DRIVE_CMDs.
 */
static inline void do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
{
        ide_hwif_t *hwif = HWIF(drive);
        unsigned long io_base = hwif->io.io_base;
        unsigned long io_shift = hwif->io.io_shift;
#ifdef CONFIG_BLK_DEV_PROMISE
        int use_promise_io = 0;
#endif /* CONFIG_BLK_DEV_PROMISE */
 
        OUT_BYTE(drive->ctl,IDE_CONTROL_REG);
        OUT_BYTE(rq->nr_sectors,io_base + (IDE_NSECTOR_OFFSET << io_shift));
#ifdef CONFIG_BLK_DEV_PROMISE
        if (IS_PROMISE_DRIVE) {
                if (hwif->is_promise2 || rq->cmd == READ) {
                        use_promise_io = 1;
                }
        }
        if (drive->select.b.lba || use_promise_io) {
#else /* !CONFIG_BLK_DEV_PROMISE */
        if (drive->select.b.lba) {
#endif /* CONFIG_BLK_DEV_PROMISE */
#ifdef DEBUG
                printk("%s: %sing: LBAsect=%ld, sectors=%ld, buffer=0x%08lx\n",
                        drive->name, (rq->cmd==READ)?"read":"writ",
                        block, rq->nr_sectors, (unsigned long) rq->buffer);
#endif
                OUT_BYTE(block,io_base + (IDE_SECTOR_OFFSET << io_shift));
                OUT_BYTE(block>>=8,io_base + (IDE_LCYL_OFFSET << io_shift));
                OUT_BYTE(block>>=8,io_base + (IDE_HCYL_OFFSET << io_shift));
                OUT_BYTE(((block>>8)&0x0f)|drive->select.all,io_base + (IDE_SELECT_OFFSET << io_shift));
        } else {
                unsigned int sect,head,cyl,track;
                track = block / drive->sect;
                sect  = block % drive->sect + 1;
                OUT_BYTE(sect,io_base + (IDE_SECTOR_OFFSET << io_shift));
                head  = track % drive->head;
                cyl   = track / drive->head;
                OUT_BYTE(cyl,io_base + (IDE_LCYL_OFFSET << io_shift));
                OUT_BYTE(cyl>>8,io_base + (IDE_HCYL_OFFSET << io_shift));
                OUT_BYTE(head|drive->select.all,io_base + (IDE_SELECT_OFFSET << io_shift));
#ifdef DEBUG
                printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
                        drive->name, (rq->cmd==READ)?"read":"writ", cyl,
                        head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
#endif
        }
#ifdef CONFIG_BLK_DEV_PROMISE
        if (use_promise_io) {
                do_promise_io (drive, rq);
                return;
        }
#endif /* CONFIG_BLK_DEV_PROMISE */
        if (rq->cmd == READ) {
#ifdef CONFIG_BLK_DEV_TRITON
                if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_read, drive)))
                        return;
#endif /* CONFIG_BLK_DEV_TRITON */
                ide_set_handler(drive, &read_intr, WAIT_CMD);
                OUT_BYTE(drive->mult_count ? WIN_MULTREAD : WIN_READ, io_base + (IDE_COMMAND_OFFSET << io_shift));
                return;
        }
        if (rq->cmd == WRITE) {
#ifdef CONFIG_BLK_DEV_TRITON
                if (drive->using_dma && !(HWIF(drive)->dmaproc(ide_dma_write, drive)))
                        return;
#endif /* CONFIG_BLK_DEV_TRITON */
                OUT_BYTE(drive->mult_count ? WIN_MULTWRITE : WIN_WRITE, io_base + (IDE_COMMAND_OFFSET << io_shift));
                if (ide_wait_stat(drive, DATA_READY, drive->bad_wstat, WAIT_DRQ)) {
                        printk("%s: no DRQ after issuing %s\n", drive->name,
                                drive->mult_count ? "MULTWRITE" : "WRITE");
                        return;
                }
                if (!drive->unmask)
                        cli();
                if (drive->mult_count) {
                        HWGROUP(drive)->wrq = *rq; /* scratchpad */
                        ide_set_handler (drive, &multwrite_intr, WAIT_CMD);
                        ide_multwrite(drive, drive->mult_count);
                } else {
                        ide_set_handler (drive, &write_intr, WAIT_CMD);
                        ide_output_data(drive, rq->buffer, SECTOR_WORDS);
                }
                return;
        }
        printk("%s: bad command: %d\n", drive->name, rq->cmd);
        ide_end_request(0, HWGROUP(drive));
}
 
/*
 * execute_drive_cmd() issues a special drive command,
 * usually initiated by ioctl() from the external hdparm program.
 */
static void execute_drive_cmd (ide_drive_t *drive, struct request *rq)
{
        ide_hwif_t *hwif = HWIF(drive);
        unsigned long io_base = hwif->io.io_base;
        unsigned long io_shift = hwif->io.io_shift;
        byte *args = rq->buffer;
        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
                OUT_BYTE(args[2],io_base + (IDE_FEATURE_OFFSET << io_shift));
                ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
                return;
        } 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;
        }
}
 
/*
 * do_request() initiates handling of a new I/O request
 */
static inline void do_request (ide_hwif_t *hwif, struct request *rq)
{
        unsigned int minor, unit;
        unsigned long block, blockend;
        ide_drive_t *drive;
 
        sti();
#ifdef DEBUG
        printk("%s: do_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
#endif
        minor = MINOR(rq->rq_dev);
        unit = minor >> PARTN_BITS;
        if (MAJOR(rq->rq_dev) != hwif->major || unit >= MAX_DRIVES) {
                printk("%s: bad device number: %s\n",
                       hwif->name, kdevname(rq->rq_dev));
                goto kill_rq;
        }
        drive = &hwif->drives[unit];
#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 ((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;
#if FAKE_FDISK_FOR_EZDRIVE
        if (block == 0 && drive->remap_0_to_1)
                block = 1;  /* redirect MBR access to EZ-Drive partn table */
#endif /* FAKE_FDISK_FOR_EZDRIVE */
        ((ide_hwgroup_t *)hwif->hwgroup)->drive = drive;
#if (DISK_RECOVERY_TIME > 0)
        while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
#endif
 
#ifdef CONFIG_BLK_DEV_IDETAPE
        POLL_HWIF_TAPE_DRIVE;   /* macro from ide-tape.h */
#endif /* CONFIG_BLK_DEV_IDETAPE */
 
        SELECT_DRIVE(hwif,drive);
        if (ide_wait_stat(drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
                printk("%s: drive not ready for command\n", drive->name);
                return;
        }
 
        if (!drive->special.all) {
                if (rq->cmd == IDE_DRIVE_CMD) {
                        execute_drive_cmd(drive, rq);
                        return;
                }
#ifdef CONFIG_BLK_DEV_IDEATAPI
                switch (drive->media) {
                        case ide_disk:
                                do_rw_disk (drive, rq, block);
                                return;
#ifdef CONFIG_BLK_DEV_IDECD
                        case ide_cdrom:
                                ide_do_rw_cdrom (drive, block);
                                return;
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
                        case ide_tape:
                                idetape_do_request (drive, rq, block);
                                return;
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                        case ide_floppy:
                                idefloppy_do_request (drive, rq, block);
                                return;
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
                        case ide_scsi:
                                idescsi_do_request (drive, rq, block);
                                return;
#endif /* CONFIG_BLK_DEV_IDESCSI */
 
                        default:
                                printk("%s: media type %d not supported\n",
                                        drive->name, drive->media);
                                goto kill_rq;
                }
#else
                do_rw_disk (drive, rq, block); /* simpler and faster */
                return;
#endif /* CONFIG_BLK_DEV_IDEATAPI */;
        }
        do_special(drive);
        return;
kill_rq:
        ide_end_request(0, hwif->hwgroup);
}
 
/*
 * The driver enables interrupts as much as possible.  In order to do this,
 * (a) the device-interrupt is always masked before entry, and
 * (b) the timeout-interrupt is always disabled before entry.
 *
 * If we enter here from, say irq14, and then start a new request for irq15,
 * (possible with "serialize" option) then we cannot ensure that we exit
 * before the irq15 hits us. So, we must be careful not to let this bother us.
 *
 * Interrupts are still masked (by default) whenever we are exchanging
 * data/cmds with a drive, because some drives seem to have very poor
 * tolerance for latency during I/O.  For devices which don't suffer from
 * this problem (most don't), the unmask flag can be set using the "hdparm"
 * utility, to permit other interrupts during data/cmd transfers.
 */
void ide_do_request (ide_hwgroup_t *hwgroup)
{
        cli();  /* paranoia */
        if (hwgroup->handler != NULL) {
                printk("%s: EEeekk!! handler not NULL in ide_do_request()\n", hwgroup->hwif->name);
                return;
        }
        do {
                ide_hwif_t *hwif = hwgroup->hwif;
                struct request *rq;
                if ((rq = hwgroup->rq) == NULL) {
                        if (hwif->sharing_irq && hwgroup->drive) /* set nIEN */
                                OUT_BYTE(hwgroup->drive->ctl|2,hwif->io.ctl_port);
                        /*
                         * hwgroup->next_hwif is different from hwgroup->hwif
                         * only when a request is inserted using "ide_next".
                         * This saves wear and tear on IDE tapes.
                         */
                        hwif = hwgroup->next_hwif;
                        do {
                                rq = blk_dev[hwif->major].current_request;
                                if (rq != NULL && rq->rq_status != RQ_INACTIVE)
                                        goto got_rq;
                        } while ((hwif = hwif->next) != hwgroup->next_hwif);
                        hwgroup->active = 0;
                        return;         /* no work left for this hwgroup */
                }
        got_rq:
                do_request(hwgroup->hwif = hwgroup->next_hwif = hwif, hwgroup->rq = rq);
                cli();
        } while (hwgroup->handler == NULL);
}
 
/*
 * do_hwgroup_request() invokes ide_do_request() after first masking
 * all possible interrupts for the current hwgroup.  This prevents race
 * conditions in the event that an unexpected interrupt occurs while
 * we are in the driver.
 *
 * Note that when an interrupt is used to reenter the driver, the first level
 * handler will already have masked the irq that triggered, but any other ones
 * for the hwgroup will still be unmasked.  The driver tries to be careful
 * about such things.
 */
static void do_hwgroup_request (ide_hwgroup_t *hwgroup)
{
        if (hwgroup->handler == NULL) {
                ide_hwif_t *hgif = hwgroup->hwif;
                ide_hwif_t *hwif = hgif;
                hwgroup->active = 1;
                do {
                        disable_irq(hwif->irq);
                } while ((hwif = hwif->next) != hgif);
                ide_do_request (hwgroup);
                do {
                        enable_irq(hwif->irq);
                } while ((hwif = hwif->next) != hgif);
        }
}
 
static void do_ide0_request (void)      /* invoked with cli() */
{
        do_hwgroup_request (ide_hwifs[0].hwgroup);
}
 
#if MAX_HWIFS > 1
static void do_ide1_request (void)      /* invoked with cli() */
{
        do_hwgroup_request (ide_hwifs[1].hwgroup);
}
#endif
 
#if MAX_HWIFS > 2
static void do_ide2_request (void)      /* invoked with cli() */
{
        do_hwgroup_request (ide_hwifs[2].hwgroup);
}
#endif
 
#if MAX_HWIFS > 3
static void do_ide3_request (void)      /* invoked with cli() */
{
        do_hwgroup_request (ide_hwifs[3].hwgroup);
}
#endif
 
static void timer_expiry (unsigned long data)
{
        ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
        ide_drive_t   *drive   = hwgroup->drive;
        unsigned long flags;
 
        save_flags(flags);
        cli();
 
        if (hwgroup->poll_timeout != 0) { /* polling in progress? */
                ide_handler_t *handler = hwgroup->handler;
                hwgroup->handler = NULL;
                handler(drive);
        } else if (hwgroup->handler == NULL) {   /* not waiting for anything? */
                sti(); /* drive must have responded just as the timer expired */
                printk("%s: marginal timeout\n", drive->name);
        } else {
                hwgroup->handler = NULL;        /* abort the operation */
                if (hwgroup->hwif->dmaproc)
                        (void) hwgroup->hwif->dmaproc (ide_dma_abort, drive);
                ide_error(drive, "irq timeout", GET_STAT());
        }
        if (hwgroup->handler == NULL)
                do_hwgroup_request (hwgroup);
        restore_flags(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;
        unsigned int unit;
        ide_hwif_t *hwif = hwgroup->hwif;
 
        /*
         * handle the unexpected interrupt
         */
        do {
                if (hwif->irq == irq) {
                        for (unit = 0; unit < MAX_DRIVES; ++unit) {
                                ide_drive_t *drive = &hwif->drives[unit];
                                if (!drive->present)
                                        continue;
                                SELECT_DRIVE(hwif,drive);
                                udelay(100);  /* Ugly, but wait_stat() may not be safe here */
                                if (!OK_STAT(stat=GET_STAT(), drive->ready_stat, BAD_STAT)) {
                                        /* Try to not flood the console with msgs */
                                        static unsigned long last_msgtime = 0;
                                        if ((last_msgtime + (HZ/2)) < jiffies) {
                                                last_msgtime = jiffies;
                                                (void) ide_dump_status(drive, "unexpected_intr", stat);
                                        }
                                }
                                if ((stat & DRQ_STAT))
                                        try_to_flush_leftover_data(drive);
                        }
                }
        } while ((hwif = hwif->next) != hwgroup->hwif);
        SELECT_DRIVE(hwif,hwgroup->drive); /* Ugh.. probably interrupts current I/O */
        udelay(100);  /* Ugly, but wait_stat() may not be safe here */
}
 
/*
 * entry point for all interrupts, caller does cli() for us
 */
void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
{
        ide_hwgroup_t *hwgroup = dev_id;
        ide_handler_t *handler;
 
        if (irq == hwgroup->hwif->irq && (handler = hwgroup->handler) != NULL) {
                ide_drive_t *drive = hwgroup->drive;
                hwgroup->handler = NULL;
                del_timer(&(hwgroup->timer));
                if (drive->unmask)
                        sti();
                handler(drive);
                cli();  /* this is necessary, as next rq may be different irq */
                if (hwgroup->handler == NULL) {
                        SET_RECOVERY_TIMER(HWIF(drive));
                        ide_do_request(hwgroup);
                }
        } else {
                unexpected_intr(irq, hwgroup);
        }
        cli();
}
 
/*
 * 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.
 */
static ide_drive_t *get_info_ptr (kdev_t i_rdev)
{
        int             major = MAJOR(i_rdev);
        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 (drive->present)
                                        return drive;
                        } else if (major == IDE0_MAJOR && unit < 4) {
                                printk("ide: probable bad entry for /dev/hd%c\n", 'a'+unit);
                                printk("ide: to fix it, run:  /usr/src/linux/scripts/MAKEDEV.ide\n");
                        }
                        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)
{
        rq->buffer = NULL;
        rq->cmd = IDE_DRIVE_CMD;
        rq->sector = 0;
        rq->nr_sectors = 0;
        rq->current_nr_sectors = 0;
        rq->sem = NULL;
        rq->bh = NULL;
        rq->bhtail = NULL;
        rq->next = NULL;
 
#if 0   /* these are done each time through ide_do_drive_cmd() */
        rq->errors = 0;
        rq->rq_status = RQ_ACTIVE;
        rq->rq_dev = ????;
#endif
}
 
/*
 * This function issues a special IDE device request
 * onto the request queue.
 *
 * If action is ide_wait, then then 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. (Currently used by ide-tape.c,
 * when operating in the pipelined operation mode).
 */
int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
{
        unsigned long flags;
        unsigned int major = HWIF(drive)->major;
        struct request *cur_rq;
        struct blk_dev_struct *bdev = &blk_dev[major];
        struct semaphore sem = MUTEX_LOCKED;
 
        if (IS_PROMISE_DRIVE && rq->buffer != NULL)
                return -ENOSYS;  /* special drive cmds not supported */
        rq->errors = 0;
        rq->rq_status = RQ_ACTIVE;
        rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
        if (action == ide_wait)
                rq->sem = &sem;
        unplug_device(bdev);
 
        save_flags(flags);
        cli();
        if (action == ide_next)
                HWGROUP(drive)->next_hwif = HWIF(drive);
        cur_rq = bdev->current_request;
 
        if (cur_rq == NULL || action == ide_preempt) {
                rq->next = cur_rq;
                bdev->current_request = rq;
                if (action == ide_preempt)
                        HWGROUP(drive)->rq = NULL;
        } else {
                if (action == ide_wait || action == ide_end) {
                        while (cur_rq->next != NULL)    /* find end of list */
                                cur_rq = cur_rq->next;
                }
                rq->next = cur_rq->next;
                cur_rq->next = rq;
        }
        if (!HWGROUP(drive)->active) {
                do_hwgroup_request(HWGROUP(drive));
                cli();
        }
        if (action == ide_wait  && rq->rq_status != RQ_INACTIVE)
                down(&sem);     /* wait for it to be serviced */
        restore_flags(flags);
        return rq->errors ? -EIO : 0;    /* return -EIO if errors */
}
 
static int ide_open(struct inode * inode, struct file * filp)
{
        ide_drive_t *drive;
        unsigned long flags;
 
        if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
                return -ENXIO;
        save_flags(flags);
        cli();
        while (drive->busy)
                sleep_on(&drive->wqueue);
        drive->usage++;
        restore_flags(flags);
#ifdef CONFIG_BLK_DEV_IDECD
        if (drive->media == ide_cdrom)
                return ide_cdrom_open (inode, filp, drive);
#endif  /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
        if (drive->media == ide_tape)
                return idetape_blkdev_open (inode, filp, drive);
#endif  /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
        if (drive->media == ide_floppy)
                return idefloppy_open (inode, filp, drive);
#endif  /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
        if (drive->media == ide_scsi)
                return idescsi_open (inode, filp, drive);
#endif  /* CONFIG_BLK_DEV_IDESCSI */
        if (drive->removable && drive->usage == 1) {
                byte door_lock[] = {WIN_DOORLOCK,0,0,0};
                struct request rq;
                check_disk_change(inode->i_rdev);
                ide_init_drive_cmd (&rq);
                rq.buffer = door_lock;
                /*
                 * Ignore the return code from door_lock,
                 * since the open() has already succeeded,
                 * and the door_lock is irrelevant at this point.
                 */
                (void) ide_do_drive_cmd(drive, &rq, ide_wait);
        }
        return 0;
}
 
/*
 * Releasing a block device means we sync() it, so that it can safely
 * be forgotten about...
 */
static void ide_release(struct inode * inode, struct file * file)
{
        ide_drive_t *drive;
 
        if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
                fsync_dev(inode->i_rdev);
                drive->usage--;
#ifdef CONFIG_BLK_DEV_IDECD
                if (drive->media == ide_cdrom) {
                        ide_cdrom_release (inode, file, drive);
                        return;
                }
#endif  /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
                if (drive->media == ide_tape) {
                        idetape_blkdev_release (inode, file, drive);
                        return;
                }
#endif  /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                if (drive->media == ide_floppy) {
                        idefloppy_release (inode, file, drive);
                        return;
                }
#endif  /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
                if (drive->media == ide_scsi) {
                        idescsi_ide_release (inode, file, drive);
                        return;
                }
#endif  /* CONFIG_BLK_DEV_IDESCSI */
                if (drive->removable && !drive->usage) {
                        byte door_unlock[] = {WIN_DOORUNLOCK,0,0,0};
                        struct request rq;
                        invalidate_buffers(inode->i_rdev);
                        ide_init_drive_cmd (&rq);
                        rq.buffer = door_unlock;
                        (void) ide_do_drive_cmd(drive, &rq, ide_wait);
                }
        }
}
 
/*
 * 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.
 */
static int revalidate_disk(kdev_t i_rdev)
{
        ide_drive_t *drive;
        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;
        save_flags(flags);
        cli();
        if (drive->busy || (drive->usage > 1)) {
                restore_flags(flags);
                return -EBUSY;
        };
        drive->busy = 1;
        restore_flags(flags);
 
        for (p = 0; p < (1<<PARTN_BITS); ++p) {
                if (drive->part[p].nr_sects > 0) {
                        kdev_t devp = MKDEV(major, minor+p);
                        fsync_dev          (devp);
                        invalidate_inodes  (devp);
                        invalidate_buffers (devp);
                        set_blocksize(devp, 1024);
                }
                drive->part[p].start_sect = 0;
                drive->part[p].nr_sects   = 0;
        };
 
        drive->part[0].nr_sects = current_capacity(drive);
        if ((drive->media != ide_disk && drive->media != ide_floppy) || !drive->part[0].nr_sects)
                drive->part[0].start_sect = -1;
        resetup_one_dev(HWIF(drive)->gd, drive->select.b.unit);
 
        drive->busy = 0;
        wake_up(&drive->wqueue);
        return 0;
}
 
static int write_fs_long (unsigned long useraddr, long value)
{
        int err;
 
        if (NULL == (long *)useraddr)
                return -EINVAL;
        if ((err = verify_area(VERIFY_WRITE, (long *)useraddr, sizeof(long))))
                return err;
        put_user((unsigned)value, (long *) useraddr);
        return 0;
}
 
static int ide_ioctl (struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
        int err;
        ide_drive_t *drive;
        unsigned long flags;
        struct request rq;
 
        if (!inode || !(inode->i_rdev))
                return -EINVAL;
        if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
                return -ENODEV;
        ide_init_drive_cmd (&rq);
        switch (cmd) {
                case HDIO_GETGEO:
                {
                        struct hd_geometry *loc = (struct hd_geometry *) arg;
                        if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
                        err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
                        if (err) return err;
                        put_user(drive->bios_head, (byte *) &loc->heads);
                        put_user(drive->bios_sect, (byte *) &loc->sectors);
                        put_user(drive->bios_cyl, (unsigned short *) &loc->cylinders);
                        put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
                                (unsigned long *) &loc->start);
                        return 0;
                }
                case BLKFLSBUF:
                        if (!suser()) return -EACCES;
                        fsync_dev(inode->i_rdev);
                        invalidate_buffers(inode->i_rdev);
                        return 0;
 
                case BLKRASET:
                        if (!suser()) return -EACCES;
                        if(arg > 0xff) return -EINVAL;
                        read_ahead[MAJOR(inode->i_rdev)] = arg;
                        return 0;
 
                case BLKRAGET:
                        return write_fs_long(arg, read_ahead[MAJOR(inode->i_rdev)]);
 
                case BLKGETSIZE:   /* Return device size */
                        return write_fs_long(arg, drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects);
                case BLKRRPART: /* Re-read partition tables */
                        if (!suser()) return -EACCES;
                        return revalidate_disk(inode->i_rdev);
 
                case HDIO_GET_KEEPSETTINGS:
                        return write_fs_long(arg, drive->keep_settings);
 
                case HDIO_GET_UNMASKINTR:
                        return write_fs_long(arg, drive->unmask);
 
                case HDIO_GET_DMA:
                        return write_fs_long(arg, drive->using_dma);
 
                case HDIO_GET_32BIT:
                        return write_fs_long(arg, drive->io_32bit);
 
                case HDIO_GET_MULTCOUNT:
                        return write_fs_long(arg, drive->mult_count);
 
                case HDIO_GET_IDENTITY:
                        if (!arg || (MINOR(inode->i_rdev) & PARTN_MASK))
                                return -EINVAL;
                        if (drive->id == NULL)
                                return -ENOMSG;
                        err = verify_area(VERIFY_WRITE, (char *)arg, sizeof(*drive->id));
                        if (!err)
                                memcpy_tofs((char *)arg, (char *)drive->id, sizeof(*drive->id));
                        return err;
 
                        case HDIO_GET_NOWERR:
                        return write_fs_long(arg, drive->bad_wstat == BAD_R_STAT);
 
                case HDIO_SET_DMA:
                        if (!suser()) return -EACCES;
#ifdef CONFIG_BLK_DEV_IDECD
                        if (drive->media == ide_cdrom)
                                return -EPERM;
#endif /* CONFIG_BLK_DEV_IDECD */
                        if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
                                return -EPERM;
                case HDIO_SET_KEEPSETTINGS:
                case HDIO_SET_UNMASKINTR:
                case HDIO_SET_NOWERR:
                        if (arg > 1)
                                return -EINVAL;
                case HDIO_SET_32BIT:
                        if (!suser()) return -EACCES;
                        if ((MINOR(inode->i_rdev) & PARTN_MASK))
                                return -EINVAL;
                        save_flags(flags);
                        cli();
                        switch (cmd) {
                                case HDIO_SET_DMA:
                                        if (!(HWIF(drive)->dmaproc)) {
                                                restore_flags(flags);
                                                return -EPERM;
                                        }
                                        drive->using_dma = arg;
                                        break;
                                case HDIO_SET_KEEPSETTINGS:
                                        drive->keep_settings = arg;
                                        break;
                                case HDIO_SET_UNMASKINTR:
                                        if (arg && drive->no_unmask) {
                                                restore_flags(flags);
                                                return -EPERM;
                                        }
                                        drive->unmask = arg;
                                        break;
                                case HDIO_SET_NOWERR:
                                        drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
                                        break;
                                case HDIO_SET_32BIT:
                                        if (arg > (1 + (SUPPORT_VLB_SYNC<<1))) {
                                                restore_flags(flags);
                                                return -EINVAL;
                                        }
                                        if (arg && drive->no_io_32bit) {
                                                restore_flags(flags);
                                                return -EPERM;
                                        }
                                        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 */
                                        break;
                        }
                        restore_flags(flags);
                        return 0;
 
                case HDIO_SET_MULTCOUNT:
                        if (!suser()) return -EACCES;
                        if (MINOR(inode->i_rdev) & PARTN_MASK)
                                return -EINVAL;
                        if (drive->id && arg > drive->id->max_multsect)
                                return -EINVAL;
                        save_flags(flags);
                        cli();
                        if (drive->special.b.set_multmode) {
                                restore_flags(flags);
                                return -EBUSY;
                        }
                        drive->mult_req = arg;
                        drive->special.b.set_multmode = 1;
                        restore_flags(flags);
                        (void) ide_do_drive_cmd (drive, &rq, ide_wait);
                        return (drive->mult_count == arg) ? 0 : -EIO;
 
                case HDIO_DRIVE_CMD:
                {
                        byte args[4], *argbuf = args;
                        int argsize = 4;
                        if (!suser() || securelevel > 0) return -EACCES;
                        if (NULL == (void *) arg) {
                                err = ide_do_drive_cmd(drive, &rq, ide_wait);
                        } else if (!(err = verify_area(VERIFY_READ,(void *)arg, 4))) {
                                memcpy_fromfs(args, (void *)arg, 4);
                                if (args[3]) {
                                        argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
                                        argbuf = kmalloc(argsize, GFP_KERNEL);
                                        if (argbuf == NULL)
                                                return -ENOMEM;
                                        argbuf[0] = args[0];
                                        argbuf[1] = args[1];
                                        argbuf[2] = args[2];
                                        argbuf[3] = args[3];
                                }
                                if (!(err = verify_area(VERIFY_WRITE,(void *)arg, argsize))) {
                                        rq.buffer = argbuf;
                                        err = ide_do_drive_cmd(drive, &rq, ide_wait);
                                        memcpy_tofs((void *)arg, argbuf, argsize);
                                }
                                if (argsize > 4)
                                        kfree(argbuf);
                        }
                        return err;
                }
                case HDIO_SET_PIO_MODE:
                        if (!suser()) return -EACCES;
                        if (MINOR(inode->i_rdev) & PARTN_MASK)
                                return -EINVAL;
                        if (!HWIF(drive)->tuneproc)
                                return -ENOSYS;
                        save_flags(flags);
                        cli();
                        if (drive->special.b.set_tune) {
                                restore_flags(flags);
                                return -EBUSY;
                        }
                        drive->tune_req = (byte) arg;
                        drive->special.b.set_tune = 1;
                        restore_flags(flags);
                        (void) ide_do_drive_cmd (drive, &rq, ide_wait);
                        return 0;
 
                RO_IOCTLS(inode->i_rdev, arg);
 
                default:
#ifdef CONFIG_BLK_DEV_IDECD
                        if (drive->media == ide_cdrom)
                                return ide_cdrom_ioctl(drive, inode, file, cmd, arg);
#endif /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDETAPE
                        if (drive->media == ide_tape)
                                return idetape_blkdev_ioctl(drive, inode, file, cmd, arg);
#endif /* CONFIG_BLK_DEV_IDETAPE */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                        if (drive->media == ide_floppy)
                                return idefloppy_ioctl(drive, inode, file, cmd, arg);
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
#ifdef CONFIG_BLK_DEV_IDESCSI
                        if (drive->media == ide_scsi)
                                return idescsi_ioctl(drive, inode, file, cmd, arg);
#endif /* CONFIG_BLK_DEV_IDESCSI */
                        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;
#ifdef CONFIG_BLK_DEV_IDECD
        if (drive->media == ide_cdrom)
                return ide_cdrom_check_media_change (drive);
#endif  /* CONFIG_BLK_DEV_IDECD */
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
        if (drive->media == ide_floppy)
                return idefloppy_media_change (drive);
#endif  /* CONFIG_BLK_DEV_IDEFLOPPY */
        if (drive->removable) /* for disks */
                return 1;       /* always assume it was changed */
        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';
}
 
static inline void do_identify (ide_drive_t *drive, byte cmd)
{
        int bswap;
        struct hd_driveid *id;
        unsigned long capacity, check;
 
        id = drive->id = kmalloc (SECTOR_WORDS*4, GFP_KERNEL);
        ide_input_data(drive, id, SECTOR_WORDS);/* read 512 bytes of id info */
        sti();
 
#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
        /*
         * EATA SCSI controllers do a hardware ATA emulation:
         * Ignore them if there is a driver for them available.
         */
        if ((id->model[0] == 'P' && id->model[1] == 'M')
         || (id->model[0] == 'S' && id->model[1] == 'K')) {
                printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
                drive->present = 0;
                return;
        }
#endif
 
        /*
         *  WIN_IDENTIFY returns little-endian info,
         *  WIN_PIDENTIFY *usually* returns little-endian info.
         */
        bswap = 1;
        if (cmd == WIN_PIDENTIFY) {
                if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
                 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
                 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
                        bswap = 0;       /* Vertos drives may still be weird */
        }
        ide_fixstring (id->model,     sizeof(id->model),     bswap);
        ide_fixstring (id->fw_rev,    sizeof(id->fw_rev),    bswap);
        ide_fixstring (id->serial_no, sizeof(id->serial_no), bswap);
 
        if (strstr(id->model, "E X A B Y T E N E S T"))
                return;
 
#ifdef CONFIG_BLK_DEV_IDEATAPI
        /*
         * Check for an ATAPI device
         */
        if (cmd == WIN_PIDENTIFY) {
                byte type = (id->config >> 8) & 0x1f;
                printk("%s: %s, ATAPI ", drive->name, id->model);
#ifdef CONFIG_BLK_DEV_PROMISE
                if (HWIF(drive)->is_promise2) {
                        printk(" -- not supported on 2nd Promise port\n");
                        drive->present = 0;
                        return;
                }
#endif /* CONFIG_BLK_DEV_PROMISE */
                if (!drive->ide_scsi) switch (type) {
                        case 0:
                                if (!strstr(id->model, "oppy") && !strstr(id->model, "poyp") && !strstr(id->model, "ZIP"))
                                        printk("cdrom or floppy?, assuming ");
                                if (drive->media != ide_cdrom && !strstr(id->model, "CD-ROM")) {
#ifdef CONFIG_BLK_DEV_IDEFLOPPY
                                        printk("FLOPPY drive\n");
                                        drive->media = ide_floppy;
                                        if (idefloppy_identify_device(drive, id))
                                                drive->present = 1;
                                        return;
#else
                                        printk("FLOPPY ");
                                        break;
#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
                                }
                                /* Early cdrom models used zero */
                        case 5:
#ifdef CONFIG_BLK_DEV_IDECD
                                printk ("CDROM drive\n");
                                drive->media = ide_cdrom;
                                drive->present = 1;
                                drive->removable = 1;
                                return;
#else
                                printk ("CDROM ");
                                break;
#endif /* CONFIG_BLK_DEV_IDECD */
                        case 1:
#ifdef CONFIG_BLK_DEV_IDETAPE
                                printk ("TAPE drive");
                                if (idetape_identify_device (drive,id)) {
                                        drive->media = ide_tape;
                                        drive->present = 1;
                                        drive->removable = 1;
                                        if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
                                                if (!HWIF(drive)->dmaproc(ide_dma_check, drive))
                                                        printk(", DMA");
                                        }
                                        printk("\n");
                                }
                                else {
                                        drive->present = 0;
                                        printk ("\nide-tape: the tape is not supported by this version of the driver\n");
                                }
                                return;
#else
                                printk ("TAPE ");
                                break;
#endif /* CONFIG_BLK_DEV_IDETAPE */
                        default:
                                drive->present = 0;
                                printk("Type %d - Unknown device\n", type);
                                return;
                }
#ifdef CONFIG_BLK_DEV_IDESCSI
                printk("drive - enabling SCSI emulation\n");
                drive->media = ide_scsi;
                drive->present = 1;
                idescsi_setup(drive);
#else
                drive->present = 0;
                printk("- not supported by this kernel\n");
#endif /* CONFIG_BLK_DEV_IDESCSI */
                return;
        }
#endif /* CONFIG_BLK_DEV_IDEATAPI */
 
        /* check for removable disks (eg. SYQUEST), ignore 'WD' drives */
        if (id->config & (1<<7)) {      /* removable disk ? */
                if (id->model[0] != 'W' || id->model[1] != 'D')
                        drive->removable = 1;
        }
 
        /* SunDisk drives: treat as non-removable, force one unit */
        if (id->model[0] == 'S' && id->model[1] == 'u') {
                drive->removable = 0;
                if (drive->select.all & (1<<4)) {
                    drive->present = 0;
                    return;
                }
        }
 
        drive->media = ide_disk;
        /* Extract geometry if we did not already have one for the drive */
        if (!drive->present) {
                drive->present = 1;
                drive->cyl     = drive->bios_cyl  = id->cyls;
                drive->head    = drive->bios_head = id->heads;
                drive->sect    = drive->bios_sect = id->sectors;
        }
        /* Handle logical geometry translation by the drive */
        if ((id->field_valid & 1) && id->cur_cyls && id->cur_heads
         && (id->cur_heads <= 16) && id->cur_sectors)
        {
                /*
                 * Extract the physical drive geometry for our use.
                 * Note that we purposely do *not* update the bios info.
                 * This way, programs that use it (like fdisk) will
                 * still have the same logical view as the BIOS does,
                 * which keeps the partition table from being screwed.
                 *
                 * An exception to this is the cylinder count,
                 * which we reexamine later on to correct for 1024 limitations.
                 */
                drive->cyl  = id->cur_cyls;
                drive->head = id->cur_heads;
                drive->sect = id->cur_sectors;
 
                /* check for word-swapped "capacity" field in id information */
                capacity = drive->cyl * drive->head * drive->sect;
                check = (id->cur_capacity0 << 16) | id->cur_capacity1;
                if (check == capacity) {        /* was it swapped? */
                        /* yes, bring it into little-endian order: */
                        id->cur_capacity0 = (capacity >>  0) & 0xffff;
                        id->cur_capacity1 = (capacity >> 16) & 0xffff;
                }
        }
        /* Use physical geometry if what we have still makes no sense */
        if ((!drive->head || drive->head > 16) && id->heads && id->heads <= 16) {
                drive->cyl  = id->cyls;
                drive->head = id->heads;
                drive->sect = id->sectors;
        }
 
        /* calculate drive capacity, and select LBA if possible */
        (void) current_capacity (drive);
 
        /* Correct the number of cyls if the bios value is too small */
        if (drive->sect == drive->bios_sect && drive->head == drive->bios_head) {
                if (drive->cyl > drive->bios_cyl)
                        drive->bios_cyl = drive->cyl;
        }
 
        if (!strncmp(id->model, "BMI ", 4) &&
            strstr(id->model, " ENHANCED IDE ") &&
            drive->select.b.lba)
                drive->no_geom = 1;
 
        printk ("%s: %.40s, %ldMB w/%dkB Cache, CHS=%d/%d/%d",
         drive->name, id->model, current_capacity(drive)/2048L, id->buf_size/2,
         drive->bios_cyl, drive->bios_head, drive->bios_sect);
 
        drive->mult_count = 0;
        if (id->max_multsect) {
                drive->mult_req = INITIAL_MULT_COUNT;
                if (drive->mult_req > id->max_multsect)
                        drive->mult_req = id->max_multsect;
                if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
                        drive->special.b.set_multmode = 1;
        }
        if (drive->autotune != 2 && HWIF(drive)->dmaproc != NULL) {
                if (!(HWIF(drive)->dmaproc(ide_dma_check, drive))) {
                        if ((id->field_valid & 4) && (id->dma_ultra & (id->dma_ultra >> 8) & 7))
                                printk(", UDMA");
                        else
                                printk(", DMA");
                }
        }
        printk("\n");
}
 
/*
 * 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.
 */
static void delay_50ms (void)
{
        unsigned long timer = jiffies + ((HZ + 19)/20) + 1;
        while (timer > jiffies);
}
 
/*
 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 * and waits for a response.  It also monitors irqs while this is
 * happening, in hope of automatically determining which one is
 * being used by the interface.
 *
 * Returns:     0  device was identified
 *              1  device timed-out (no response to identify request)
 *              2  device aborted the command (refused to identify itself)
 */
static int try_to_identify (ide_drive_t *drive, byte cmd)
{
        int hd_status, rc;
        unsigned long timeout;
        unsigned long irqs_on = 0;
        int irq_off;
 
        if (!HWIF(drive)->irq) {                /* already got an IRQ? */
                probe_irq_off(probe_irq_on());  /* clear dangling irqs */
                irqs_on = probe_irq_on();       /* start monitoring irqs */
                OUT_BYTE(drive->ctl,IDE_CONTROL_REG);   /* enable device irq */
        }
 
        delay_50ms();                           /* take a deep breath */
        if ((IN_BYTE(IDE_ALTSTATUS_REG) ^ IN_BYTE(IDE_STATUS_REG)) & ~INDEX_STAT) {
                printk("%s: probing with STATUS instead of ALTSTATUS\n", drive->name);
                hd_status = IDE_STATUS_REG;     /* ancient Seagate drives */
        } else
                hd_status = IDE_ALTSTATUS_REG;  /* use non-intrusive polling */
 
#if CONFIG_BLK_DEV_PROMISE
        if (IS_PROMISE_DRIVE) {
                if (promise_cmd(drive,PROMISE_IDENTIFY)) {
                        if (irqs_on)
                                (void) probe_irq_off(irqs_on);
                        return 1;
                }
        } else
#endif /* CONFIG_BLK_DEV_PROMISE */
                OUT_BYTE(cmd,IDE_COMMAND_REG);          /* ask drive for ID */
        timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
        timeout += jiffies;
        do {
                if (jiffies > timeout) {
                        if (irqs_on)
                                (void) probe_irq_off(irqs_on);
                        return 1;       /* drive timed-out */
                }
                delay_50ms();           /* give drive a breather */
        } while (IN_BYTE(hd_status) & BUSY_STAT);
 
        delay_50ms();           /* wait for IRQ and DRQ_STAT */
        if (OK_STAT(GET_STAT(),DRQ_STAT,BAD_R_STAT)) {
                unsigned long flags;
                save_flags(flags);
                cli();                  /* some systems need this */
                do_identify(drive, cmd); /* drive returned ID */
                rc = 0;                  /* drive responded with ID */
                (void) GET_STAT();      /* clear drive IRQ */
                restore_flags(flags);
        } else
                rc = 2;                 /* drive refused ID */
        if (!HWIF(drive)->irq) {
                irq_off = probe_irq_off(irqs_on);       /* get our irq number */
                if (irq_off > 0) {
                        HWIF(drive)->irq = irq_off; /* save it for later */
                        irqs_on = probe_irq_on();
                        OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* mask device irq */
                        udelay(5);
                        (void) probe_irq_off(irqs_on);
                        (void) probe_irq_off(probe_irq_on()); /* clear self-inflicted irq */
                        (void) GET_STAT();      /* clear drive IRQ */
 
                } else {        /* Mmmm.. multiple IRQs.. don't know which was ours */
                        printk("%s: IRQ probe failed (%d)\n", drive->name, irq_off);
#ifdef CONFIG_BLK_DEV_CMD640
#ifdef CMD640_DUMP_REGS
                        if (HWIF(drive)->chipset == ide_cmd640) {
                                printk("%s: Hmmm.. probably a driver problem.\n", drive->name);
                                CMD640_DUMP_REGS;
                        }
#endif /* CMD640_DUMP_REGS */
#endif /* CONFIG_BLK_DEV_CMD640 */
                }
        }
        return rc;
}
 
/*
 * do_probe() has the difficult job of finding a drive if it exists,
 * without getting hung up if it doesn't exist, without trampling on
 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
 *
 * If a drive is "known" to exist (from CMOS or kernel parameters),
 * but does not respond right away, the probe will "hang in there"
 * for the maximum wait time (about 30 seconds), otherwise it will
 * exit much more quickly.
 *
 * Returns:     0  device was identified
 *              1  device timed-out (no response to identify request)
 *              2  device aborted the command (refused to identify itself)
 *              3  bad status from device (possible for ATAPI drives)
 *              4  probe was not attempted because failure was obvious
 */
static int do_probe (ide_drive_t *drive, byte cmd)
{
        int rc;
        ide_hwif_t *hwif = HWIF(drive);
        unsigned long timeout;
#ifdef CONFIG_BLK_DEV_IDEATAPI
        if (drive->present) {   /* avoid waiting for inappropriate probes */
                if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
                        return 4;
        }
#endif  /* CONFIG_BLK_DEV_IDEATAPI */
#ifdef DEBUG
        printk("probing for %s: present=%d, media=%d, probetype=%s\n",
                drive->name, drive->present, drive->media,
                (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
#endif
        SELECT_DRIVE(hwif,drive);
        delay_50ms();
        if (IN_BYTE(IDE_SELECT_REG) != drive->select.all && !drive->present) {
                OUT_BYTE(0xa0,IDE_SELECT_REG);  /* exit with drive0 selected */
                delay_50ms();           /* allow BUSY_STAT to assert & clear */
                return 3;    /* no i/f present: avoid killing ethernet cards */
        }
 
        if (OK_STAT(GET_STAT(),READY_STAT,BUSY_STAT)
         || drive->present || cmd == WIN_PIDENTIFY)
        {
                if ((rc = try_to_identify(drive,cmd)))   /* send cmd and wait */
                        rc = try_to_identify(drive,cmd); /* failed: try again */
                if (rc == 1 && cmd == WIN_PIDENTIFY && drive->autotune != 2) {
                        printk("%s: no response (status = 0x%02x), resetting drive\n", drive->name, GET_STAT());
                        delay_50ms();
                        OUT_BYTE (drive->select.all, IDE_SELECT_REG);
                        delay_50ms();
                        OUT_BYTE(WIN_SRST, IDE_COMMAND_REG);
                        timeout = jiffies;
                        while ((GET_STAT() & BUSY_STAT) && jiffies < timeout + WAIT_WORSTCASE)
                                delay_50ms();
                        rc = try_to_identify(drive, cmd);
                }
                if (rc == 1)
                        printk("%s: no response (status = 0x%02x)\n", drive->name, GET_STAT());
                (void) GET_STAT();              /* ensure drive irq is clear */
        } else {
                rc = 3;                         /* not present or maybe ATAPI */
        }
        if (drive->select.b.unit != 0) {
                OUT_BYTE(0xa0,IDE_SELECT_REG);  /* exit with drive0 selected */
                delay_50ms();
                (void) GET_STAT();              /* ensure drive irq is clear */
        }
        return rc;
}
 
static void enable_nest (ide_drive_t *drive)
{
        unsigned long timeout;
 
        printk("%s: enabling %s -- ", HWIF(drive)->name, drive->id->model);
        SELECT_DRIVE(HWIF(drive), drive);
        delay_50ms();
        OUT_BYTE(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
        timeout = jiffies + WAIT_WORSTCASE;
        do {
                if (jiffies > timeout) {
                        printk("failed (timeout)\n");
                        return;
                }
                delay_50ms();
        } while (GET_STAT() & BUSY_STAT);
        delay_50ms();
        if (!OK_STAT(GET_STAT(), 0, BAD_STAT))
                printk("failed (status = 0x%02x)\n", GET_STAT());
        else
                printk("success\n");
        if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
#ifdef CONFIG_BLK_DEV_IDEATAPI
                (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
#endif  /* CONFIG_BLK_DEV_IDEATAPI */
        }
}
 
/*
 * probe_for_drive() tests for existence of a given drive using do_probe().
 *
 * Returns:     0  no device was found
 *              1  device was found (note: drive->present might still be 0)
 */
static inline byte probe_for_drive (ide_drive_t *drive)
{
        if (drive->noprobe)                     /* skip probing? */
                return drive->present;
        if (do_probe(drive, WIN_IDENTIFY) >= 2) { /* if !(success||timed-out) */
#ifdef CONFIG_BLK_DEV_IDEATAPI
                (void) do_probe(drive, WIN_PIDENTIFY); /* look for ATAPI device */
#endif  /* CONFIG_BLK_DEV_IDEATAPI */
        }
        if (drive->id && strstr(drive->id->model, "E X A B Y T E N E S T"))
                enable_nest(drive);
        if (!drive->present)
                return 0;                        /* drive not found */
        if (drive->id == NULL) {                /* identification failed? */
                if (drive->media == ide_disk) {
                        printk ("%s: non-IDE drive, CHS=%d/%d/%d\n",
                         drive->name, drive->cyl, drive->head, drive->sect);
                }
#ifdef CONFIG_BLK_DEV_IDECD
                else if (drive->media == ide_cdrom) {
                        printk("%s: ATAPI cdrom (?)\n", drive->name);
                }
#endif  /* CONFIG_BLK_DEV_IDECD */
                else {
                        drive->present = 0;      /* nuke it */
                }
        }
        return 1;       /* drive was found */
}
 
/*
 * We query CMOS about hard disks : it could be that we have a SCSI/ESDI/etc
 * controller that is BIOS compatible with ST-506, and thus showing up in our
 * BIOS table, but not register compatible, and therefore not present in CMOS.
 *
 * Furthermore, we will assume that our ST-506 drives <if any> are the primary
 * drives in the system -- the ones reflected as drive 1 or 2.  The first
 * drive is stored in the high nibble of CMOS byte 0x12, the second in the low
 * nibble.  This will be either a 4 bit drive type or 0xf indicating use byte
 * 0x19 for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS.  A non-zero value
 * means we have an AT controller hard disk for that drive.
 *
 * Of course, there is no guarantee that either drive is actually on the
 * "primary" IDE interface, but we don't bother trying to sort that out here.
 * If a drive is not actually on the primary interface, then these parameters
 * will be ignored.  This results in the user having to supply the logical
 * drive geometry as a boot parameter for each drive not on the primary i/f.
 *
 * The only "perfect" way to handle this would be to modify the setup.[cS] code
 * to do BIOS calls Int13h/Fn08h and Int13h/Fn48h to get all of the drive info
 * for us during initialization.  I have the necessary docs -- any takers?  -ml
 */
static void probe_cmos_for_drives (ide_hwif_t *hwif)
{
#ifdef __i386__
        extern struct drive_info_struct drive_info;
        byte cmos_disks, *BIOS = (byte *) &drive_info;
        int unit;
 
#ifdef CONFIG_BLK_DEV_PROMISE
        if (hwif->is_promise2)
                return;
#endif /* CONFIG_BLK_DEV_PROMISE */
        outb_p(0x12,0x70);              /* specify CMOS address 0x12 */
        cmos_disks = inb_p(0x71);       /* read the data from 0x12 */
        /* Extract drive geometry from CMOS+BIOS if not already setup */
        for (unit = 0; unit < MAX_DRIVES; ++unit) {
                ide_drive_t *drive = &hwif->drives[unit];
                if ((cmos_disks & (0xf0 >> (unit*4))) && !drive->present && !drive->nobios) {
                        drive->cyl   = drive->bios_cyl  = *(unsigned short *)BIOS;
                        drive->head  = drive->bios_head = *(BIOS+2);
                        drive->sect  = drive->bios_sect = *(BIOS+14);
                        drive->ctl   = *(BIOS+8);
                        drive->present = 1;
                }
                BIOS += 16;
        }
#endif
}
 
/*
 * This routine only knows how to look for drive units 0 and 1
 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 */
static void probe_hwif (ide_hwif_t *hwif)
{
        unsigned int unit;
 
        if (hwif->noprobe)
                return;
        if (hwif->io.io_base == HD_DATA)
                probe_cmos_for_drives (hwif);
#if CONFIG_BLK_DEV_PROMISE
        if (!hwif->is_promise2 &&
           (check_region(hwif->io_base,8) || check_region(hwif->ctl_port,1))) {
#else
        if (check_region(hwif->io.io_base,8) || check_region(hwif->io.ctl_port,1)) {
#endif /* CONFIG_BLK_DEV_PROMISE */
                int msgout = 0;
                for (unit = 0; unit < MAX_DRIVES; ++unit) {
                        ide_drive_t *drive = &hwif->drives[unit];
                        if (drive->present) {
                                drive->present = 0;
                                printk("%s: ERROR, PORTS ALREADY IN USE\n", drive->name);
                                msgout = 1;
                        }
                }
                if (!msgout)
                        printk("%s: ports already in use, skipping probe\n", hwif->name);
        } else {
                unsigned long flags;
                save_flags(flags);
 
                sti();  /* needed for jiffies and irq probing */
                /*
                 * Second drive should only exist if first drive was found,
                 * but a lot of cdrom drives are configured as single slaves.
                 */
                for (unit = 0; unit < MAX_DRIVES; ++unit) {
                        ide_drive_t *drive = &hwif->drives[unit];
                        (void) probe_for_drive (drive);
                        if (drive->present && drive->media == ide_disk) {
                                if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
                                        printk("%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
                                         drive->name, drive->head);
                                        drive->present = 0;
                                }
                        }
                        if (drive->present && !hwif->present) {
                                hwif->present = 1;
                                request_region(hwif->io.io_base,  8, hwif->name);
                                request_region(hwif->io.ctl_port, 1, hwif->name);
                        }
                }
                restore_flags(flags);
                for (unit = 0; unit < MAX_DRIVES; ++unit) {
                        ide_drive_t *drive = &hwif->drives[unit];
                        if (drive->present && drive->media != ide_tape) {
                                ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
                                if (tuneproc != NULL && drive->autotune == 1)
                                        tuneproc(drive, 255);   /* auto-tune PIO mode */
                        }
                }
        }
}
 
/*
 * stridx() returns the offset of c within s,
 * or -1 if c is '\0' or not found within s.
 */
static int 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 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;
                }
                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=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.
 *
 * "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)
 *
 * The following are valid ONLY on ide0,
 * 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=qd6580"        : probe/support qd6580 interface
 * "ide0=ali14xx"       : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
 * "ide0=umc8672"       : probe/support umc8672 chipsets
 */
void 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);
 
        printk("ide_setup: %s", s);
        init_ide_data ();
 
        /*
         * 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", "ide-scsi", NULL};
                unit = s[2] - 'a';
                hw   = unit / MAX_DRIVES;
                unit = unit % MAX_DRIVES;
                hwif = &ide_hwifs[hw];
                drive = &hwif->drives[unit];
                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: /* "ide-scsi" */
                                drive->ide_scsi = 1;
                                goto done;
                        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
                 */
                const char *ide_words[] = {"noprobe", "serialize", "autotune", "noautotune",
                        "qd6580", "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 <= -5) {
                        if (hwif->chipset != ide_unknown)
                                goto bad_option;
                        if (i <= -5) {
                                if (ide_hwifs[1].chipset != ide_unknown)
                                        goto bad_option;
                                /*
                                 * Interface keywords work only for ide0:
                                 */
                                if (hw != 0)
                                        goto bad_hwif;
                        }
                }
 
                switch (i) {
#ifdef CONFIG_BLK_DEV_PROMISE
                        case -11: /* "dc4030" */
                        {
                                setup_dc4030(hwif);
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_PROMISE */
#ifdef CONFIG_BLK_DEV_ALI14XX
                        case -10: /* "ali14xx" */
                        {
                                extern void init_ali14xx (void);
                                init_ali14xx();
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_ALI14XX */
#ifdef CONFIG_BLK_DEV_UMC8672
                        case -9: /* "umc8672" */
                        {
                                extern void init_umc8672 (void);
                                init_umc8672();
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_UMC8672 */
#ifdef CONFIG_BLK_DEV_DTC2278
                        case -8: /* "dtc2278" */
                        {
                                extern void init_dtc2278 (void);
                                init_dtc2278();
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_DTC2278 */
#ifdef CONFIG_BLK_DEV_CMD640
                        case -7: /* "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 -6: /* "ht6560b" */
                        {
                                extern void init_ht6560b (void);
                                init_ht6560b();
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_HT6560B */
#if CONFIG_BLK_DEV_QD6580
                        case -5: /* "qd6580" (has secondary i/f) */
                        {
                                extern void init_qd6580 (void);
                                init_qd6580();
                                goto done;
                        }
#endif /* CONFIG_BLK_DEV_QD6580 */
                        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:
                                ide_hwifs[hw].serialized = 1;   /* serialize */
                                ide_hwifs[hw^1].serialized = 1; /* with mate */
                                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->io.io_base  = vals[0];
                                hwif->io.ctl_port = vals[1];
                                hwif->io.io_shift = 0;
                                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;
                }
        }
bad_option:
        printk(" -- BAD OPTION\n");
        return;
bad_hwif:
        printk("-- NOT SUPPORTED ON ide%d", hw);
done:
        printk("\n");
}
 
/*
 * This routine is called from the partition-table code in genhd.c
 * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
 *
 * The second parameter, "xparm", determines exactly how the translation
 * will be handled:
 *               0 = convert to CHS with fewer than 1024 cyls
 *                      using the same method as Ontrack DiskManager.
 *               1 = same as "0", plus offset everything by 63 sectors.
 *              -1 = similar to "0", plus redirect sector 0 to sector 1.
 *              >1 = convert to a CHS geometry with "xparm" heads.
 *
 * Returns 0 if the translation was not possible, if the device was not
 * an IDE disk drive, or if a geometry was "forced" on the commandline.
 * Returns 1 if the geometry translation was successful.
 */
int ide_xlate_1024 (kdev_t i_rdev, int xparm, const char *msg)
{
        ide_drive_t *drive;
        static const byte head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
        const byte *heads = head_vals;
        unsigned long tracks;
 
        if ((drive = get_info_ptr(i_rdev)) == NULL || drive->forced_geom)
                return 0;
 
        if (xparm > 1 && xparm <= drive->bios_head && drive->bios_sect == 63)
                return 0;                /* we already have a translation */
 
        printk("%s ", msg);
 
        if (drive->id) {
                drive->cyl  = drive->id->cyls;
                drive->head = drive->id->heads;
                drive->sect = drive->id->sectors;
        }
        drive->bios_cyl  = drive->cyl;
        drive->bios_head = drive->head;
        drive->bios_sect = drive->sect;
        drive->special.b.set_geometry = 1;
 
        tracks = drive->bios_cyl * drive->bios_head * drive->bios_sect / 63;
        drive->bios_sect = 63;
        if (xparm > 1) {
                drive->bios_head = xparm;
                drive->bios_cyl = tracks / drive->bios_head;
        } else {
                while (drive->bios_cyl >= 1024) {
                        drive->bios_head = *heads;
                        drive->bios_cyl = tracks / drive->bios_head;
                        if (0 == *++heads)
                                break;
                }
#if FAKE_FDISK_FOR_EZDRIVE
                if (xparm == -1) {
                        drive->remap_0_to_1 = 1;
                        msg = "0->1";
                } else
#endif /* FAKE_FDISK_FOR_EZDRIVE */
                if (xparm == 1) {
                        drive->sect0 = 63;
                        drive->bios_cyl = (tracks - 1) / drive->bios_head;
                        msg = "+63";
                }
                printk("[remap %s] ", msg);
        }
        drive->part[0].nr_sects = current_capacity(drive);
        printk("[%d/%d/%d]", drive->bios_cyl, drive->bios_head, drive->bios_sect);
        return 1;
}
 
#if MAX_HWIFS > 1
/*
 * save_match() is used to simplify logic in init_irq() below.
 *
 * A loophole here is that we may not know about a particular
 * hwif's irq until after that hwif is actually probed/initialized..
 * This could be a problem for the case where an hwif is on a
 * dual interface that requires serialization (eg. cmd640) and another
 * hwif using one of the same irqs is initialized beforehand.
 *
 * This routine detects and reports such situations, but does not fix them.
 */
static void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
{
        ide_hwif_t *m = *match;
 
        if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
                if (!new->hwgroup)
                        return;
                printk("%s: potential irq problem with %s and %s\n", hwif->name, new->name, m->name);
        }
        if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
                *match = new;
}
#endif /* MAX_HWIFS > 1 */
 
/*
 * This routine sets up the irq for an ide interface, and creates a new
 * hwgroup for the irq/hwif if none was previously assigned.
 *
 * Much of the code is for correctly detecting/handling irq sharing
 * and irq serialization situations.  This is somewhat complex because
 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 *
 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 * interrupts completely disabled.  This can be bad for interrupt latency,
 * but anything else has led to problems on some machines.  We re-enable
 * interrupts as much as we can safely do in most places.
 */
static int init_irq (ide_hwif_t *hwif)
{
        unsigned long flags;
#if MAX_HWIFS > 1
        unsigned int index;
#endif /* MAX_HWIFS > 1 */
        ide_hwgroup_t *hwgroup;
        ide_hwif_t *match = NULL;
 
        save_flags(flags);
        cli();
 
        hwif->hwgroup = NULL;
#if MAX_HWIFS > 1
        /*
         * Group up with any other hwifs that share our irq(s).
         */
        for (index = 0; index < MAX_HWIFS; index++) {
                ide_hwif_t *h = &ide_hwifs[index];
                if (h->hwgroup) {  /* scan only initialized hwif's */
                        if (hwif->irq == h->irq) {
                                hwif->sharing_irq = h->sharing_irq = 1;
                                save_match(hwif, h, &match);
                        }
                        if (hwif->serialized) {
                                ide_hwif_t *mate = &ide_hwifs[hwif->index^1];
                                if (index == mate->index || h->irq == mate->irq)
                                        save_match(hwif, h, &match);
                        }
                        if (h->serialized) {
                                ide_hwif_t *mate = &ide_hwifs[h->index^1];
                                if (hwif->irq == mate->irq)
                                        save_match(hwif, h, &match);
                        }
                }
        }
#endif /* MAX_HWIFS > 1 */
        /*
         * If we are still without a hwgroup, then form a new one
         */
        if (match) {
                hwgroup = match->hwgroup;
        } else {
                hwgroup = kmalloc(sizeof(ide_hwgroup_t), GFP_KERNEL);
                hwgroup->hwif    = hwgroup->next_hwif = hwif->next = hwif;
                hwgroup->rq      = NULL;
                hwgroup->handler = NULL;
                if (hwif->drives[0].present)
                        hwgroup->drive = &hwif->drives[0];
                else
                        hwgroup->drive = &hwif->drives[1];
                hwgroup->poll_timeout = 0;
                hwgroup->active = 0;
                init_timer(&hwgroup->timer);
                hwgroup->timer.function = &timer_expiry;
                hwgroup->timer.data = (unsigned long) hwgroup;
        }
 
        /*
         * Allocate the irq, if not already obtained for another hwif
         */
        if (!match || match->irq != hwif->irq) {
                if (request_irq(hwif->irq, ide_intr, SA_INTERRUPT, hwif->name, hwgroup)) {
                        if (!match)
                                kfree(hwgroup);
                        restore_flags(flags);
                        return 1;
                }
        }
 
        /*
         * Everything is okay, so link us into the hwgroup
         */
        hwif->hwgroup = hwgroup;
        hwif->next = hwgroup->hwif->next;
        hwgroup->hwif->next = hwif;
 
        restore_flags(flags);   /* safe now that hwif->hwgroup is set up */
 
        printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
                hwif->io.io_base, hwif->io.io_base+7, hwif->io.ctl_port, hwif->irq);
        if (match)
                printk(" (%sed with %s)", hwif->sharing_irq ? "shar" : "serializ", match->name);
        printk("\n");
        return 0;
}
 
static struct file_operations ide_fops = {
        NULL,                   /* lseek - default */
        block_read,             /* read - general block-dev read */
        block_write,            /* write - general block-dev write */
        NULL,                   /* readdir - bad */
        NULL,                   /* select */
        ide_ioctl,              /* ioctl */
        NULL,                   /* mmap */
        ide_open,               /* open */
        ide_release,            /* release */
        block_fsync             /* fsync */
        ,NULL,                  /* fasync */
        ide_check_media_change, /* check_media_change */
        revalidate_disk         /* revalidate */
};
 
#ifdef CONFIG_PCI
#if defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON)
 
typedef void (ide_pci_init_proc_t)(byte, byte);
 
/*
 * ide_probe_pci() scans PCI for a specific vendor/device function,
 * and invokes the supplied init routine for each instance detected.
 */
static void ide_probe_pci (unsigned short vendor, unsigned short device, ide_pci_init_proc_t *init, int func_adj)
{
        unsigned long flags;
        unsigned index;
        byte fn, bus;
 
        save_flags(flags);
        cli();
        for (index = 0; !pcibios_find_device (vendor, device, index, &bus, &fn); ++index) {
                init (bus, fn + func_adj);
        }
        restore_flags(flags);
}
 
#endif /* defined(CONFIG_BLK_DEV_RZ1000) || defined(CONFIG_BLK_DEV_TRITON) */
 
static void ide_probe_promise_20246(void)
{
        byte fn, bus;
        unsigned short io[6], count = 0;
        unsigned int reg, tmp, i;
        ide_hwif_t *hwif;
 
        memset(io, 0, 6 * sizeof(unsigned short));
        if (pcibios_find_device(PCI_VENDOR_ID_PROMISE, PCI_DEVICE_ID_PROMISE_20246, 0, &bus, &fn))
                return;
        printk("ide: Promise Technology IDE Ultra-DMA 33 on PCI bus %d function %d\n", bus, fn);
        for (reg = PCI_BASE_ADDRESS_0; reg <= PCI_BASE_ADDRESS_5; reg += 4) {
                pcibios_read_config_dword(bus, fn, reg, &tmp);
                if (tmp & PCI_BASE_ADDRESS_SPACE_IO)
                        io[count++] = tmp & PCI_BASE_ADDRESS_IO_MASK;
        }
        for (i = 2; i < 4; i++) {
                hwif = ide_hwifs + i;
                if (hwif->chipset == ide_generic) {
                        printk("ide%d: overridden with command line parameter\n", i);
                        return;
                }
                tmp = (i - 2) * 2;
                if (!io[tmp] || !io[tmp + 1]) {
                        printk("ide%d: invalid port address %x, %x -- aborting\n", i, io[tmp], io[tmp + 1]);
                        return;
                }
                hwif->io_base = io[tmp];
                hwif->ctl_port = io[tmp + 1] + 2;
                hwif->noprobe = 0;
        }
#ifdef CONFIG_BLK_DEV_TRITON
        ide_init_promise (bus, fn, &ide_hwifs[2], &ide_hwifs[3], io[4]);
#endif
}
 
#endif /* CONFIG_PCI */
 
/*
 * ide_init_pci() finds/initializes "known" PCI IDE interfaces
 *
 * This routine should ideally be using pcibios_find_class() to find
 * all IDE interfaces, but that function causes some systems to "go weird".
 */
static void probe_for_hwifs (void)
{
#ifdef CONFIG_PCI
        /*
         * Find/initialize PCI IDE interfaces
         */
        if (pcibios_present()) {
#ifdef CONFIG_BLK_DEV_RZ1000
                ide_pci_init_proc_t init_rz1000;
                ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000, &init_rz1000, 0);
                ide_probe_pci (PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001, &init_rz1000, 0);
#endif /* CONFIG_BLK_DEV_RZ1000 */
#ifdef CONFIG_BLK_DEV_TRITON
                /*
                 * Apparently the BIOS32 services on Intel motherboards are
                 * buggy and won't find the PCI_DEVICE_ID_INTEL_82371_1 for us.
                 * So instead, we search for PCI_DEVICE_ID_INTEL_82371_0,
                 * and then add 1.
                 */
                ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371_0, &ide_init_triton, 1);
                ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_1, &ide_init_triton, 0);
                ide_probe_pci (PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB, &ide_init_triton, 0);
#endif /* CONFIG_BLK_DEV_TRITON */
                ide_probe_promise_20246();
        }
#endif /* CONFIG_PCI */
#ifdef CONFIG_BLK_DEV_CMD640
        {
                extern void ide_probe_for_cmd640x (void);
                ide_probe_for_cmd640x();
        }
#endif
#ifdef CONFIG_BLK_DEV_PROMISE
        init_dc4030();
#endif
#ifdef CONFIG_BLK_DEV_IDE_ICSIDE
        icside_init ();
#endif
#ifdef CONFIG_BLK_DEV_IDE_RAPIDE
        rapide_init ();
#endif
}
 
static int hwif_init (int h)
{
        ide_hwif_t *hwif = &ide_hwifs[h];
        void (*rfn)(void);
 
        if (!hwif->present)
                return 0;
        if (!hwif->irq) {
                if (!(hwif->irq = default_irqs[h])) {
                        printk("%s: DISABLED, NO IRQ\n", hwif->name);
                        return (hwif->present = 0);
                }
        }
#ifdef CONFIG_BLK_DEV_HD
        if (hwif->irq == HD_IRQ && hwif->io_base != HD_DATA) {
                printk("%s: CANNOT SHARE IRQ WITH OLD HARDDISK DRIVER (hd.c)\n", hwif->name);
                return (hwif->present = 0);
        }
#endif /* CONFIG_BLK_DEV_HD */
 
        hwif->present = 0; /* we set it back to 1 if all is ok below */
        switch (hwif->major) {
        case IDE0_MAJOR: rfn = &do_ide0_request; break;
#if MAX_HWIFS > 1
        case IDE1_MAJOR: rfn = &do_ide1_request; break;
#endif
#if MAX_HWIFS > 2
        case IDE2_MAJOR: rfn = &do_ide2_request; break;
#endif
#if MAX_HWIFS > 3
        case IDE3_MAJOR: rfn = &do_ide3_request; break;
#endif
        default:
                printk("%s: request_fn NOT DEFINED\n", hwif->name);
                return (hwif->present = 0);
        }
        if (register_blkdev (hwif->major, hwif->name, &ide_fops)) {
                printk("%s: UNABLE TO GET MAJOR NUMBER %d\n", hwif->name, hwif->major);
        } else if (init_irq (hwif)) {
                printk("%s: UNABLE TO GET IRQ %d\n", hwif->name, hwif->irq);
                (void) unregister_blkdev (hwif->major, hwif->name);
        } else {
                init_gendisk(hwif);
                blk_dev[hwif->major].request_fn = rfn;
                read_ahead[hwif->major] = 8;    /* (4kB) */
                hwif->present = 1;      /* success */
        }
        return hwif->present;
}
 
/*
 * A variable so that we know if we're adding drives at boot time,
 * so we don't do a partition check on it.
 */
static int ide_at_boot;
/*
 * This is gets invoked once during initialization, to set *everything* up
 */
int ide_init (void)
{
        int index;
 
        ide_at_boot = 1;
 
        init_ide_data ();
        /*
         * Probe for special "known" interface chipsets
         */
        probe_for_hwifs ();
 
        /*
         * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
         */
        for (index = 0; index < MAX_HWIFS; ++index)
                probe_hwif (&ide_hwifs[index]);
        for (index = 0; index < MAX_HWIFS; ++index)
                hwif_init (index);
 
#ifdef CONFIG_BLK_DEV_IDETAPE
        idetape_register_chrdev();      /* Register character device interface to the ide tape */
#endif /* CONFIG_BLK_DEV_IDETAPE */
 
        ide_at_boot = 0;
 
        return 0;
}
 
#ifdef CONFIG_BLK_DEV_IDE_CARDS
int ide_register_port (int io_base, int ctl_port, int stepping, int irq)
{
        int index, i, rc = -1;
        ide_hwif_t *hwif;
        ide_drive_t *drive;
        unsigned long flags;
 
        save_flags(flags);
        cli();
        for (index = 0; index < MAX_HWIFS; ++index) {
                hwif = &ide_hwifs[index];
                if (hwif->present) {
                        if (hwif->io.io_base == io_base || hwif->io.ctl_port == ctl_port)
                                break; /* this ide port already exists */
                } else {
                        if (ide_at_boot) {
                                if (hwif->io.io_base == 0) {
                                        hwif->io.io_base = io_base;
                                        hwif->io.ctl_port = ctl_port;
                                        hwif->io.io_shift = stepping;
                                        hwif->irq = irq;
                                        hwif->noprobe = 0;
                                        rc = index;
                                        break;
                                }
                        } else {
                                hwif->io.io_base = io_base;
                                hwif->io.ctl_port = ctl_port;
                                hwif->io.io_shift = stepping;
                                hwif->irq = irq;
                                hwif->noprobe = 0;
                                probe_hwif(hwif);
                                if (!hwif_init(index))
                                        break;
                                for (i = 0; i < hwif->gd->nr_real; i++) {
                                        drive = &hwif->drives[i];
                                        revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
#ifdef CONFIG_BLK_DEV_IDECD
                                        if (drive->present && drive->media == ide_cdrom)
                                                ide_cdrom_setup(drive);
#endif /* CONFIG_BLK_DEV_IDECD */
                                }
                                rc = index;
                                break;
                        }
                }
        }
        restore_flags(flags);
        return rc;
}
#endif
 
#ifdef CONFIG_BLK_DEV_IDE_PCMCIA
int ide_register(int io_base, int ctl_port, int irq)
{
        int index, i, rc = -1;
        ide_hwif_t *hwif;
        ide_drive_t *drive;
        unsigned long flags;
 
        save_flags(flags);
        cli();
        for (index = 0; index < MAX_HWIFS; ++index) {
                hwif = &ide_hwifs[index];
                if (hwif->present) {
                        if (hwif->io.io_base == io_base || hwif->io.ctl_port == ctl_port)
                                break; /* this ide port already exists */
                } else {
                        hwif->io.io_base = io_base;
                        hwif->io.ctl_port = ctl_port;
                        hwif->io.io_shift = 0;
                        hwif->irq = irq;
                        hwif->noprobe = 0;
                        probe_hwif(hwif);
                        if (!hwif_init(index))
                                break;
                        for (i = 0; i < hwif->gd->nr_real; i++) {
                                drive = &hwif->drives[i];
                                revalidate_disk(MKDEV(hwif->major, i<<PARTN_BITS));
#ifdef CONFIG_BLK_DEV_IDECD
                                if (drive->present && drive->media == ide_cdrom)
                                        ide_cdrom_setup(drive);
#endif /* CONFIG_BLK_DEV_IDECD */
                        }
                        rc = index;
                        break;
                }
        }
        restore_flags(flags);
        return rc;
}
#endif
 
#if defined(CONFIG_BLK_DEV_IDE_PCMCIA) || defined(CONFIG_BLK_DEV_IDE_CARDS)
void ide_unregister (unsigned int index)
{
        struct gendisk *gd, **gdp;
        ide_hwif_t *hwif, *g;
        ide_hwgroup_t *hwgroup;
        int irq_count = 0;
        unsigned long flags;
 
        if (index >= MAX_HWIFS)
                return;
        save_flags(flags);
        cli();
        hwif = &ide_hwifs[index];
        if (!hwif->present || hwif->drives[0].busy || hwif->drives[1].busy) {
                restore_flags(flags);
                return;
        }
        hwif->present = 0;
        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.
         */
        release_region(hwif->io.io_base, 8 << hwif->io.io_shift);
        release_region(hwif->io.ctl_port, 1);
 
        /*
         * Remove us from the hwgroup, and free
         * the hwgroup if we were the only member
         */
        while (hwgroup->hwif->next != hwif)
                hwgroup->hwif = hwgroup->hwif->next;
        hwgroup->hwif->next = hwif->next;
        if (hwgroup->hwif == hwif)
                hwgroup->hwif = hwif->next;
        if (hwgroup->next_hwif == hwif)
                hwgroup->next_hwif = hwif->next;
        if (hwgroup->hwif == hwif)
                kfree(hwgroup);
 
        /*
         * Remove us from the kernel's knowledge
         */
        unregister_blkdev(hwif->major, hwif->name);
        kfree(blksize_size[hwif->major]);
        blk_dev[hwif->major].request_fn = NULL;
        blksize_size[hwif->major] = NULL;
        for (gdp = &gendisk_head; *gdp; gdp = &((*gdp)->next))
                if (*gdp == hwif->gd)
                        break;
        if (*gdp == NULL)
                printk("gd not in disk chain!\n");
        else {
                gd = *gdp; *gdp = gd->next;
                kfree(gd->sizes);
                kfree(gd->part);
                kfree(gd);
        }
        init_hwif_data (index); /* restore hwif data to pristine status */
        restore_flags(flags);
}
#endif /* CONFIG_BLK_DEV_IDE_PCMCIA */
Browse

Tools

Subversion Repositories or1k_old

[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [armnommu/] [drivers/] [block/] [ide.c] - Blame information for rev 1782

Line No.	Rev	Author	Line
1	1622	jcastillo	`/*`
2			`* linux/drivers/block/ide.c Version 5.53 Jun 24, 1997`
3			`*`
4			`* Copyright (C) 1994-1996 Linus Torvalds & authors (see below)`
5			`*/`
6			`#define _IDE_C /* needed by <linux/blk.h> */`
7
8			`/*`
9			`* Maintained by Mark Lord <mlord@pobox.com>`
10			`* and Gadi Oxman <gadio@netvision.net.il>`
11			`*`
12			`* This is the multiple IDE interface driver, as evolved from hd.c.`
13			`* It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15).`
14			`* There can be up to two drives per interface, as per the ATA-2 spec.`
15			`*`
16			`* Primary: ide0, port 0x1f0; major=3; hda is minor=0; hdb is minor=64`
17			`* Secondary: ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64`
18			`* Tertiary: ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64`
19			`* Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64`
20			`*`
21			`* It is easy to extend ide.c to handle more than four interfaces:`
22			`*`
23			`* Change the MAX_HWIFS constant in ide.h.`
24			`*`
25			`* Define some new major numbers (in major.h), and insert them into`
26			`* the ide_hwif_to_major table in ide.c.`
27			`*`
28			`* Fill in the extra values for the new interfaces into the two tables`
29			`* inside ide.c: default_io_base[] and default_irqs[].`
30			`*`
31			`* Create the new request handlers by cloning "do_ide3_request()"`
32			`* for each new interface, and add them to the switch statement`
33			`* in the ide_init() function in ide.c.`
34			`*`
35			`* Recompile, create the new /dev/ entries, and it will probably work.`
36			`*`
37			`* From hd.c:`
38			`* \|`
39			`* \| It traverses the request-list, using interrupts to jump between functions.`
40			`* \| As nearly all functions can be called within interrupts, we may not sleep.`