patch-2.3.99-pre1 linux/drivers/ide/ide.c
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- Lines: 3640
- Date:
Sun Mar 12 19:32:58 2000
- Orig file:
v2.3.51/linux/drivers/ide/ide.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.51/linux/drivers/ide/ide.c linux/drivers/ide/ide.c
@@ -0,0 +1,3639 @@
+/*
+ * linux/drivers/block/ide.c Version 6.30 Dec 28, 1999
+ *
+ * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
+ */
+
+/*
+ * Mostly written by Mark Lord <mlord@pobox.com>
+ * and Gadi Oxman <gadio@netvision.net.il>
+ *
+ * See linux/MAINTAINERS for address of current maintainer.
+ *
+ * This is the multiple IDE interface driver, as evolved from hd.c.
+ * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * Primary: ide0, port 0x1f0; major=3; hda is minor=0; hdb is minor=64
+ * Secondary: ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
+ * Tertiary: ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
+ * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
+ * ...
+ *
+ * From hd.c:
+ * |
+ * | It traverses the request-list, using interrupts to jump between functions.
+ * | As nearly all functions can be called within interrupts, we may not sleep.
+ * | Special care is recommended. Have Fun!
+ * |
+ * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
+ * |
+ * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ * | in the early extended-partition checks and added DM partitions.
+ * |
+ * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
+ * |
+ * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
+ * | and general streamlining by Mark Lord (mlord@pobox.com).
+ *
+ * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
+ *
+ * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
+ * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
+ * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
+ *
+ * This was a rewrite of just about everything from hd.c, though some original
+ * code is still sprinkled about. Think of it as a major evolution, with
+ * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
+ *
+ * Version 1.0 ALPHA initial code, primary i/f working okay
+ * Version 1.3 BETA dual i/f on shared irq tested & working!
+ * Version 1.4 BETA added auto probing for irq(s)
+ * Version 1.5 BETA added ALPHA (untested) support for IDE cd-roms,
+ * ...
+ * Version 5.50 allow values as small as 20 for idebus=
+ * Version 5.51 force non io_32bit in drive_cmd_intr()
+ * change delay_10ms() to delay_50ms() to fix problems
+ * Version 5.52 fix incorrect invalidation of removable devices
+ * add "hdx=slow" command line option
+ * Version 5.60 start to modularize the driver; the disk and ATAPI
+ * drivers can be compiled as loadable modules.
+ * move IDE probe code to ide-probe.c
+ * move IDE disk code to ide-disk.c
+ * add support for generic IDE device subdrivers
+ * add m68k code from Geert Uytterhoeven
+ * probe all interfaces by default
+ * add ioctl to (re)probe an interface
+ * Version 6.00 use per device request queues
+ * attempt to optimize shared hwgroup performance
+ * add ioctl to manually adjust bandwidth algorithms
+ * add kerneld support for the probe module
+ * fix bug in ide_error()
+ * fix bug in the first ide_get_lock() call for Atari
+ * don't flush leftover data for ATAPI devices
+ * Version 6.01 clear hwgroup->active while the hwgroup sleeps
+ * support HDIO_GETGEO for floppies
+ * Version 6.02 fix ide_ack_intr() call
+ * check partition table on floppies
+ * Version 6.03 handle bad status bit sequencing in ide_wait_stat()
+ * Version 6.10 deleted old entries from this list of updates
+ * replaced triton.c with ide-dma.c generic PCI DMA
+ * added support for BIOS-enabled UltraDMA
+ * rename all "promise" things to "pdc4030"
+ * fix EZ-DRIVE handling on small disks
+ * Version 6.11 fix probe error in ide_scan_devices()
+ * fix ancient "jiffies" polling bugs
+ * mask all hwgroup interrupts on each irq entry
+ * Version 6.12 integrate ioctl and proc interfaces
+ * fix parsing of "idex=" command line parameter
+ * Version 6.13 add support for ide4/ide5 courtesy rjones@orchestream.com
+ * Version 6.14 fixed IRQ sharing among PCI devices
+ * Version 6.15 added SMP awareness to IDE drivers
+ * Version 6.16 fixed various bugs; even more SMP friendly
+ * Version 6.17 fix for newest EZ-Drive problem
+ * Version 6.18 default unpartitioned-disk translation now "BIOS LBA"
+ * Version 6.19 Re-design for a UNIFORM driver for all platforms,
+ * model based on suggestions from Russell King and
+ * Geert Uytterhoeven
+ * Promise DC4030VL now supported.
+ * add support for ide6/ide7
+ * delay_50ms() changed to ide_delay_50ms() and exported.
+ * Version 6.20 Added/Fixed Generic ATA-66 support and hwif detection.
+ * Added hdx=flash to allow for second flash disk
+ * detection w/o the hang loop.
+ * Added support for ide8/ide9
+ * Added idex=ata66 for the quirky chipsets that are
+ * ATA-66 compliant, but have yet to determine a method
+ * of verification of the 80c cable presence.
+ * Specifically Promise's PDC20262 chipset.
+ * Version 6.21 Fixing/Fixed SMP spinlock issue with insight from an old
+ * hat that clarified original low level driver design.
+ * Version 6.30 Added SMP support; fixed multmode issues. -ml
+ *
+ * Some additional driver compile-time options are in ./include/linux/ide.h
+ *
+ * To do, in likely order of completion:
+ * - modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
+ *
+ */
+
+#define REVISION "Revision: 6.30"
+#define VERSION "Id: ide.c 6.30 1999/12/28"
+
+#undef REALLY_SLOW_IO /* most systems can safely undef this */
+
+#define _IDE_C /* Tell ide.h it's really us */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/genhd.h>
+#include <linux/blkpg.h>
+#include <linux/malloc.h>
+#ifndef MODULE
+#include <linux/init.h>
+#endif /* MODULE */
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/devfs_fs_kernel.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+
+#include "ide_modes.h"
+
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif /* CONFIG_KMOD */
+
+#ifdef CONFIG_BLK_DEV_VIA82CXXX
+extern byte fifoconfig; /* defined in via82cxxx.c used by ide_setup() */
+#endif /* CONFIG_BLK_DEV_VIA82CXXX */
+
+static const byte ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR, IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
+
+static int idebus_parameter = 0; /* holds the "idebus=" parameter */
+static int system_bus_speed = 0; /* holds what we think is VESA/PCI bus speed */
+static int initializing; /* set while initializing built-in drivers */
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+static int ide_scan_direction = 0; /* THIS was formerly 2.2.x pci=reverse */
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+
+#if defined(__mc68000__) || defined(CONFIG_APUS)
+/*
+ * ide_lock is used by the Atari code to obtain access to the IDE interrupt,
+ * which is shared between several drivers.
+ */
+static int ide_lock = 0;
+#endif /* __mc68000__ || CONFIG_APUS */
+
+/*
+ * ide_modules keeps track of the available IDE chipset/probe/driver modules.
+ */
+ide_module_t *ide_modules = NULL;
+ide_module_t *ide_probe = NULL;
+
+/*
+ * This is declared extern in ide.h, for access by other IDE modules:
+ */
+ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
+
+#if (DISK_RECOVERY_TIME > 0)
+/*
+ * For really screwy hardware (hey, at least it *can* be used with Linux)
+ * we can enforce a minimum delay time between successive operations.
+ */
+static unsigned long read_timer (void)
+{
+ unsigned long t, flags;
+ int i;
+
+ __save_flags(flags); /* local CPU only */
+ __cli(); /* local CPU only */
+ t = jiffies * 11932;
+ outb_p(0, 0x43);
+ i = inb_p(0x40);
+ i |= inb(0x40) << 8;
+ __restore_flags(flags); /* local CPU only */
+ return (t - i);
+}
+#endif /* DISK_RECOVERY_TIME */
+
+static inline void set_recovery_timer (ide_hwif_t *hwif)
+{
+#if (DISK_RECOVERY_TIME > 0)
+ hwif->last_time = read_timer();
+#endif /* DISK_RECOVERY_TIME */
+}
+
+/*
+ * Do not even *think* about calling this!
+ */
+static void init_hwif_data (unsigned int index)
+{
+ unsigned int unit;
+ hw_regs_t hw;
+ ide_hwif_t *hwif = &ide_hwifs[index];
+
+ /* bulk initialize hwif & drive info with zeros */
+ memset(hwif, 0, sizeof(ide_hwif_t));
+ memset(&hw, 0, sizeof(hw_regs_t));
+
+ /* fill in any non-zero initial values */
+ hwif->index = index;
+ ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
+ memcpy(&hwif->hw, &hw, sizeof(hw));
+ memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
+ hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+#ifdef CONFIG_BLK_DEV_HD
+ if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
+ hwif->noprobe = 1; /* may be overridden by ide_setup() */
+#endif /* CONFIG_BLK_DEV_HD */
+ hwif->major = ide_hwif_to_major[index];
+ hwif->name[0] = 'i';
+ hwif->name[1] = 'd';
+ hwif->name[2] = 'e';
+ hwif->name[3] = '0' + index;
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ ide_drive_t *drive = &hwif->drives[unit];
+
+ drive->media = ide_disk;
+ drive->select.all = (unit<<4)|0xa0;
+ drive->hwif = hwif;
+ drive->ctl = 0x08;
+ drive->ready_stat = READY_STAT;
+ drive->bad_wstat = BAD_W_STAT;
+ drive->special.b.recalibrate = 1;
+ drive->special.b.set_geometry = 1;
+ drive->name[0] = 'h';
+ drive->name[1] = 'd';
+ drive->name[2] = 'a' + (index * MAX_DRIVES) + unit;
+ init_waitqueue_head(&drive->wqueue);
+ }
+}
+
+/*
+ * init_ide_data() sets reasonable default values into all fields
+ * of all instances of the hwifs and drives, but only on the first call.
+ * Subsequent calls have no effect (they don't wipe out anything).
+ *
+ * This routine is normally called at driver initialization time,
+ * but may also be called MUCH earlier during kernel "command-line"
+ * parameter processing. As such, we cannot depend on any other parts
+ * of the kernel (such as memory allocation) to be functioning yet.
+ *
+ * This is too bad, as otherwise we could dynamically allocate the
+ * ide_drive_t structs as needed, rather than always consuming memory
+ * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
+ */
+#define MAGIC_COOKIE 0x12345678
+static void __init init_ide_data (void)
+{
+ unsigned int index;
+ static unsigned long magic_cookie = MAGIC_COOKIE;
+
+ if (magic_cookie != MAGIC_COOKIE)
+ return; /* already initialized */
+ magic_cookie = 0;
+
+ /* Initialise all interface structures */
+ for (index = 0; index < MAX_HWIFS; ++index)
+ init_hwif_data(index);
+
+ /* Add default hw interfaces */
+ ide_init_default_hwifs();
+
+ idebus_parameter = 0;
+ system_bus_speed = 0;
+}
+
+/*
+ * CompactFlash cards and their brethern pretend to be removable hard disks, except:
+ * (1) they never have a slave unit, and
+ * (2) they don't have doorlock mechanisms.
+ * This test catches them, and is invoked elsewhere when setting appropriate config bits.
+ *
+ * FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD) devices,
+ * so in linux 2.3.x we should change this to just treat all PCMCIA drives this way,
+ * and get rid of the model-name tests below (too big of an interface change for 2.2.x).
+ * At that time, we might also consider parameterizing the timeouts and retries,
+ * since these are MUCH faster than mechanical drives. -M.Lord
+ */
+int drive_is_flashcard (ide_drive_t *drive)
+{
+ struct hd_driveid *id = drive->id;
+
+ if (drive->removable && id != NULL) {
+ if (id->config == 0x848a) return 1; /* CompactFlash */
+ if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */
+ || !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */
+ || !strncmp(id->model, "SunDisk SDCFB", 13) /* SunDisk */
+ || !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
+ || !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
+ {
+ return 1; /* yes, it is a flash memory card */
+ }
+ }
+ return 0; /* no, it is not a flash memory card */
+}
+
+/*
+ * ide_system_bus_speed() returns what we think is the system VESA/PCI
+ * bus speed (in MHz). This is used for calculating interface PIO timings.
+ * The default is 40 for known PCI systems, 50 otherwise.
+ * The "idebus=xx" parameter can be used to override this value.
+ * The actual value to be used is computed/displayed the first time through.
+ */
+int ide_system_bus_speed (void)
+{
+ if (!system_bus_speed) {
+ if (idebus_parameter)
+ system_bus_speed = idebus_parameter; /* user supplied value */
+#ifdef CONFIG_PCI
+ else if (pci_present())
+ system_bus_speed = 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%s\n", system_bus_speed,
+ idebus_parameter ? "" : "; override with idebus=xx");
+ }
+ return system_bus_speed;
+}
+
+#if SUPPORT_VLB_SYNC
+/*
+ * Some localbus EIDE interfaces require a special access sequence
+ * when using 32-bit I/O instructions to transfer data. We call this
+ * the "vlb_sync" sequence, which consists of three successive reads
+ * of the sector count register location, with interrupts disabled
+ * to ensure that the reads all happen together.
+ */
+static inline void do_vlb_sync (ide_ioreg_t port) {
+ (void) inb (port);
+ (void) inb (port);
+ (void) inb (port);
+}
+#endif /* SUPPORT_VLB_SYNC */
+
+/*
+ * This is used for most PIO data transfers *from* the IDE interface
+ */
+void ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+{
+ byte io_32bit = drive->io_32bit;
+
+ if (io_32bit) {
+#if SUPPORT_VLB_SYNC
+ if (io_32bit & 2) {
+ unsigned long flags;
+ __save_flags(flags); /* local CPU only */
+ __cli(); /* local CPU only */
+ do_vlb_sync(IDE_NSECTOR_REG);
+ insl(IDE_DATA_REG, buffer, wcount);
+ __restore_flags(flags); /* local CPU only */
+ } else
+#endif /* SUPPORT_VLB_SYNC */
+ insl(IDE_DATA_REG, buffer, wcount);
+ } else {
+#if SUPPORT_SLOW_DATA_PORTS
+ if (drive->slow) {
+ unsigned short *ptr = (unsigned short *) buffer;
+ while (wcount--) {
+ *ptr++ = inw_p(IDE_DATA_REG);
+ *ptr++ = inw_p(IDE_DATA_REG);
+ }
+ } else
+#endif /* SUPPORT_SLOW_DATA_PORTS */
+ insw(IDE_DATA_REG, buffer, wcount<<1);
+ }
+}
+
+/*
+ * This is used for most PIO data transfers *to* the IDE interface
+ */
+void ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+{
+ byte io_32bit = drive->io_32bit;
+
+ if (io_32bit) {
+#if SUPPORT_VLB_SYNC
+ if (io_32bit & 2) {
+ unsigned long flags;
+ __save_flags(flags); /* local CPU only */
+ __cli(); /* local CPU only */
+ do_vlb_sync(IDE_NSECTOR_REG);
+ outsl(IDE_DATA_REG, buffer, wcount);
+ __restore_flags(flags); /* local CPU only */
+ } else
+#endif /* SUPPORT_VLB_SYNC */
+ outsl(IDE_DATA_REG, buffer, wcount);
+ } else {
+#if SUPPORT_SLOW_DATA_PORTS
+ if (drive->slow) {
+ unsigned short *ptr = (unsigned short *) buffer;
+ while (wcount--) {
+ outw_p(*ptr++, IDE_DATA_REG);
+ outw_p(*ptr++, IDE_DATA_REG);
+ }
+ } else
+#endif /* SUPPORT_SLOW_DATA_PORTS */
+ outsw(IDE_DATA_REG, buffer, wcount<<1);
+ }
+}
+
+/*
+ * The following routines are mainly used by the ATAPI drivers.
+ *
+ * These routines will round up any request for an odd number of bytes,
+ * so if an odd bytecount is specified, be sure that there's at least one
+ * extra byte allocated for the buffer.
+ */
+void atapi_input_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
+{
+ ++bytecount;
+#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
+ if (MACH_IS_ATARI || MACH_IS_Q40) {
+ /* Atari has a byte-swapped IDE interface */
+ insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
+ return;
+ }
+#endif /* CONFIG_ATARI */
+ ide_input_data (drive, buffer, bytecount / 4);
+ if ((bytecount & 0x03) >= 2)
+ insw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
+}
+
+void atapi_output_bytes (ide_drive_t *drive, void *buffer, unsigned int bytecount)
+{
+ ++bytecount;
+#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
+ if (MACH_IS_ATARI || MACH_IS_Q40) {
+ /* Atari has a byte-swapped IDE interface */
+ outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
+ return;
+ }
+#endif /* CONFIG_ATARI */
+ ide_output_data (drive, buffer, bytecount / 4);
+ if ((bytecount & 0x03) >= 2)
+ outsw (IDE_DATA_REG, ((byte *)buffer) + (bytecount & ~0x03), 1);
+}
+
+/*
+ * Needed for PCI irq sharing
+ */
+static inline int drive_is_ready (ide_drive_t *drive)
+{
+ if (drive->waiting_for_dma)
+ return HWIF(drive)->dmaproc(ide_dma_test_irq, drive);
+#if 0
+ udelay(1); /* need to guarantee 400ns since last command was issued */
+#endif
+ if (GET_STAT() & BUSY_STAT) /* Note: this may clear a pending IRQ!! */
+ return 0; /* drive busy: definitely not interrupting */
+ return 1; /* drive ready: *might* be interrupting */
+}
+
+/*
+ * This is our end_request replacement function.
+ */
+void ide_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
+{
+ struct request *rq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&io_request_lock, flags);
+ rq = hwgroup->rq;
+
+ if (!end_that_request_first(rq, uptodate, hwgroup->drive->name)) {
+ add_blkdev_randomness(MAJOR(rq->rq_dev));
+ blkdev_dequeue_request(rq);
+ hwgroup->rq = NULL;
+ end_that_request_last(rq);
+ }
+ spin_unlock_irqrestore(&io_request_lock, flags);
+}
+
+/*
+ * This should get invoked any time we exit the driver to
+ * wait for an interrupt response from a drive. handler() points
+ * at the appropriate code to handle the next interrupt, and a
+ * timer is started to prevent us from waiting forever in case
+ * something goes wrong (see the ide_timer_expiry() handler later on).
+ */
+void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
+ unsigned int timeout, ide_expiry_t *expiry)
+{
+ unsigned long flags;
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+
+ spin_lock_irqsave(&io_request_lock, flags);
+ if (hwgroup->handler != NULL) {
+ printk("%s: ide_set_handler: handler not null; old=%p, new=%p\n",
+ drive->name, hwgroup->handler, handler);
+ }
+ hwgroup->handler = handler;
+ hwgroup->expiry = expiry;
+ hwgroup->timer.expires = jiffies + timeout;
+ add_timer(&hwgroup->timer);
+ spin_unlock_irqrestore(&io_request_lock, flags);
+}
+
+/*
+ * current_capacity() returns the capacity (in sectors) of a drive
+ * according to its current geometry/LBA settings.
+ */
+unsigned long current_capacity (ide_drive_t *drive)
+{
+ if (!drive->present)
+ return 0;
+ if (drive->driver != NULL)
+ return DRIVER(drive)->capacity(drive);
+ return 0;
+}
+
+extern struct block_device_operations ide_fops[];
+/*
+ * ide_geninit() is called exactly *once* for each interface.
+ */
+void ide_geninit (ide_hwif_t *hwif)
+{
+ unsigned int unit;
+ struct gendisk *gd = hwif->gd;
+
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ ide_drive_t *drive = &hwif->drives[unit];
+
+ if (!drive->present)
+ continue;
+ if (drive->media!=ide_disk && drive->media!=ide_floppy)
+ continue;
+ register_disk(gd,MKDEV(hwif->major,unit<<PARTN_BITS),
+#ifdef CONFIG_BLK_DEV_ISAPNP
+ (drive->forced_geom && drive->noprobe) ? 1 :
+#endif /* CONFIG_BLK_DEV_ISAPNP */
+ 1<<PARTN_BITS, ide_fops,
+ current_capacity(drive));
+ }
+}
+
+static ide_startstop_t do_reset1 (ide_drive_t *, int); /* needed below */
+
+/*
+ * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
+ * during an atapi drive reset operation. If the drive has not yet responded,
+ * and we have not yet hit our maximum waiting time, then the timer is restarted
+ * for another 50ms.
+ */
+static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
+{
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+ byte stat;
+
+ SELECT_DRIVE(HWIF(drive),drive);
+ udelay (10);
+
+ if (OK_STAT(stat=GET_STAT(), 0, BUSY_STAT)) {
+ printk("%s: ATAPI reset complete\n", drive->name);
+ } else {
+ if (0 < (signed long)(hwgroup->poll_timeout - jiffies)) {
+ ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20, NULL);
+ return ide_started; /* continue polling */
+ }
+ hwgroup->poll_timeout = 0; /* end of polling */
+ printk("%s: ATAPI reset timed-out, status=0x%02x\n", drive->name, stat);
+ return do_reset1 (drive, 1); /* do it the old fashioned way */
+ }
+ hwgroup->poll_timeout = 0; /* done polling */
+ return ide_stopped;
+}
+
+/*
+ * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
+ * during an ide reset operation. If the drives have not yet responded,
+ * and we have not yet hit our maximum waiting time, then the timer is restarted
+ * for another 50ms.
+ */
+static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
+{
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+ ide_hwif_t *hwif = HWIF(drive);
+ byte tmp;
+
+ if (!OK_STAT(tmp=GET_STAT(), 0, BUSY_STAT)) {
+ if (0 < (signed long)(hwgroup->poll_timeout - jiffies)) {
+ ide_set_handler (drive, &reset_pollfunc, HZ/20, NULL);
+ return ide_started; /* continue polling */
+ }
+ printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
+ } 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 */
+ return ide_stopped;
+}
+
+static void pre_reset (ide_drive_t *drive)
+{
+ if (drive->driver != NULL)
+ DRIVER(drive)->pre_reset(drive);
+
+ if (!drive->keep_settings) {
+ if (drive->using_dma) {
+ (void) HWIF(drive)->dmaproc(ide_dma_off, drive);
+ } else {
+ drive->unmask = 0;
+ drive->io_32bit = 0;
+ }
+ }
+}
+
+/*
+ * do_reset1() attempts to recover a confused drive by resetting it.
+ * Unfortunately, resetting a disk drive actually resets all devices on
+ * the same interface, so it can really be thought of as resetting the
+ * interface rather than resetting the drive.
+ *
+ * ATAPI devices have their own reset mechanism which allows them to be
+ * individually reset without clobbering other devices on the same interface.
+ *
+ * Unfortunately, the IDE interface does not generate an interrupt to let
+ * us know when the reset operation has finished, so we must poll for this.
+ * Equally poor, though, is the fact that this may a very long time to complete,
+ * (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
+ * we set a timer to poll at 50ms intervals.
+ */
+static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
+{
+ unsigned int unit;
+ unsigned long flags;
+ ide_hwif_t *hwif = HWIF(drive);
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+
+ __save_flags(flags); /* local CPU only */
+ __cli(); /* local CPU only */
+
+ /* For an ATAPI device, first try an ATAPI SRST. */
+ if (drive->media != ide_disk && !do_not_try_atapi) {
+ pre_reset(drive);
+ SELECT_DRIVE(hwif,drive);
+ udelay (20);
+ OUT_BYTE (WIN_SRST, IDE_COMMAND_REG);
+ hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+ ide_set_handler (drive, &atapi_reset_pollfunc, HZ/20, NULL);
+ __restore_flags (flags); /* local CPU only */
+ return ide_started;
+ }
+
+ /*
+ * First, reset any device state data we were maintaining
+ * for any of the drives on this interface.
+ */
+ for (unit = 0; unit < MAX_DRIVES; ++unit)
+ pre_reset(&hwif->drives[unit]);
+
+#if OK_TO_RESET_CONTROLLER
+ if (!IDE_CONTROL_REG) {
+ __restore_flags(flags);
+ return ide_stopped;
+ }
+ /*
+ * Note that we also set nIEN while resetting the device,
+ * to mask unwanted interrupts from the interface during the reset.
+ * However, due to the design of PC hardware, this will cause an
+ * immediate interrupt due to the edge transition it produces.
+ * This single interrupt gives us a "fast poll" for drives that
+ * recover from reset very quickly, saving us the first 50ms wait time.
+ */
+ OUT_BYTE(drive->ctl|6,IDE_CONTROL_REG); /* set SRST and nIEN */
+ udelay(10); /* more than enough time */
+ OUT_BYTE(drive->ctl|2,IDE_CONTROL_REG); /* clear SRST, leave nIEN */
+ udelay(10); /* more than enough time */
+ hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
+ ide_set_handler (drive, &reset_pollfunc, HZ/20, NULL);
+
+ /*
+ * Some weird controller like resetting themselves to a strange
+ * state when the disks are reset this way. At least, the Winbond
+ * 553 documentation says that
+ */
+ if (hwif->resetproc != NULL)
+ hwif->resetproc(drive);
+
+#endif /* OK_TO_RESET_CONTROLLER */
+
+ __restore_flags (flags); /* local CPU only */
+ return ide_started;
+}
+
+/*
+ * ide_do_reset() is the entry point to the drive/interface reset code.
+ */
+ide_startstop_t ide_do_reset (ide_drive_t *drive)
+{
+ return do_reset1 (drive, 0);
+}
+
+/*
+ * Clean up after success/failure of an explicit drive cmd
+ */
+void ide_end_drive_cmd (ide_drive_t *drive, byte stat, byte err)
+{
+ unsigned long flags;
+ struct request *rq = 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);
+ }
+ }
+ spin_lock_irqsave(&io_request_lock, flags);
+ blkdev_dequeue_request(rq);
+ HWGROUP(drive)->rq = NULL;
+ rq->rq_status = RQ_INACTIVE;
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ if (rq->sem != NULL)
+ up(rq->sem); /* inform originator that rq has been serviced */
+}
+
+/*
+ * Error reporting, in human readable form (luxurious, but a memory hog).
+ */
+byte ide_dump_status (ide_drive_t *drive, const char *msg, byte stat)
+{
+ unsigned long flags;
+ byte err = 0;
+
+ __save_flags (flags); /* local CPU only */
+ ide__sti(); /* local CPU only */
+ printk("%s: %s: status=0x%02x", drive->name, msg, stat);
+#if FANCY_STATUS_DUMPS
+ printk(" { ");
+ if (stat & BUSY_STAT)
+ printk("Busy ");
+ else {
+ if (stat & READY_STAT) printk("DriveReady ");
+ if (stat & WRERR_STAT) printk("DeviceFault ");
+ if (stat & SEEK_STAT) printk("SeekComplete ");
+ if (stat & DRQ_STAT) printk("DataRequest ");
+ if (stat & ECC_STAT) printk("CorrectedError ");
+ if (stat & INDEX_STAT) printk("Index ");
+ if (stat & ERR_STAT) printk("Error ");
+ }
+ printk("}");
+#endif /* FANCY_STATUS_DUMPS */
+ printk("\n");
+ if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
+ err = GET_ERR();
+ printk("%s: %s: error=0x%02x", drive->name, msg, err);
+#if FANCY_STATUS_DUMPS
+ if (drive->media == ide_disk) {
+ printk(" { ");
+ if (err & ABRT_ERR) printk("DriveStatusError ");
+ if (err & ICRC_ERR) printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
+ if (err & ECC_ERR) printk("UncorrectableError ");
+ if (err & ID_ERR) printk("SectorIdNotFound ");
+ if (err & TRK0_ERR) printk("TrackZeroNotFound ");
+ if (err & MARK_ERR) printk("AddrMarkNotFound ");
+ printk("}");
+ if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR || (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
+ byte cur = IN_BYTE(IDE_SELECT_REG);
+ if (cur & 0x40) { /* using LBA? */
+ printk(", LBAsect=%ld", (unsigned long)
+ ((cur&0xf)<<24)
+ |(IN_BYTE(IDE_HCYL_REG)<<16)
+ |(IN_BYTE(IDE_LCYL_REG)<<8)
+ | IN_BYTE(IDE_SECTOR_REG));
+ } else {
+ printk(", CHS=%d/%d/%d",
+ (IN_BYTE(IDE_HCYL_REG)<<8) +
+ IN_BYTE(IDE_LCYL_REG),
+ cur & 0xf,
+ IN_BYTE(IDE_SECTOR_REG));
+ }
+ if (HWGROUP(drive)->rq)
+ printk(", sector=%ld", HWGROUP(drive)->rq->sector);
+ }
+ }
+#endif /* FANCY_STATUS_DUMPS */
+ printk("\n");
+ }
+ __restore_flags (flags); /* local CPU only */
+ return err;
+}
+
+/*
+ * try_to_flush_leftover_data() is invoked in response to a drive
+ * unexpectedly having its DRQ_STAT bit set. As an alternative to
+ * resetting the drive, this routine tries to clear the condition
+ * by read a sector's worth of data from the drive. Of course,
+ * this may not help if the drive is *waiting* for data from *us*.
+ */
+static void try_to_flush_leftover_data (ide_drive_t *drive)
+{
+ int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
+
+ if (drive->media != ide_disk)
+ return;
+ while (i > 0) {
+ u32 buffer[16];
+ unsigned int wcount = (i > 16) ? 16 : i;
+ i -= wcount;
+ ide_input_data (drive, buffer, wcount);
+ }
+}
+
+/*
+ * ide_error() takes action based on the error returned by the drive.
+ */
+ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat)
+{
+ struct request *rq;
+ byte err;
+
+ err = ide_dump_status(drive, msg, stat);
+ if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
+ return ide_stopped;
+ /* retry only "normal" I/O: */
+ if (rq->cmd == IDE_DRIVE_CMD) {
+ rq->errors = 1;
+ ide_end_drive_cmd(drive, stat, err);
+ return ide_stopped;
+ }
+ if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) { /* other bits are useless when BUSY */
+ rq->errors |= ERROR_RESET;
+ } else {
+ if (drive->media == ide_disk && (stat & ERR_STAT)) {
+ /* err has different meaning on cdrom and tape */
+ if (err == ABRT_ERR) {
+ if (drive->select.b.lba && IN_BYTE(IDE_COMMAND_REG) == WIN_SPECIFY)
+ return ide_stopped; /* some newer drives don't support WIN_SPECIFY */
+ } else if ((err & (ABRT_ERR | ICRC_ERR)) == (ABRT_ERR | ICRC_ERR))
+ ; /* UDMA crc error -- just retry the operation */
+ else if (err & (BBD_ERR | ECC_ERR)) /* retries won't help these */
+ rq->errors = ERROR_MAX;
+ else if (err & TRK0_ERR) /* help it find track zero */
+ rq->errors |= ERROR_RECAL;
+ }
+ if ((stat & DRQ_STAT) && rq->cmd != WRITE)
+ try_to_flush_leftover_data(drive);
+ }
+ if (GET_STAT() & (BUSY_STAT|DRQ_STAT))
+ OUT_BYTE(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); /* force an abort */
+
+ if (rq->errors >= ERROR_MAX) {
+ if (drive->driver != NULL)
+ DRIVER(drive)->end_request(0, HWGROUP(drive));
+ else
+ ide_end_request(0, HWGROUP(drive));
+ } else {
+ if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
+ ++rq->errors;
+ return ide_do_reset(drive);
+ }
+ if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
+ drive->special.b.recalibrate = 1;
+ ++rq->errors;
+ }
+ return ide_stopped;
+}
+
+/*
+ * Issue a simple drive command
+ * The drive must be selected beforehand.
+ */
+void ide_cmd (ide_drive_t *drive, byte cmd, byte nsect, ide_handler_t *handler)
+{
+ ide_set_handler (drive, handler, WAIT_CMD, NULL);
+ if (IDE_CONTROL_REG)
+ OUT_BYTE(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */
+ OUT_BYTE(nsect,IDE_NSECTOR_REG);
+ OUT_BYTE(cmd,IDE_COMMAND_REG);
+}
+
+/*
+ * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
+ */
+static ide_startstop_t drive_cmd_intr (ide_drive_t *drive)
+{
+ struct request *rq = HWGROUP(drive)->rq;
+ byte *args = (byte *) rq->buffer;
+ byte stat = GET_STAT();
+ int retries = 10;
+
+ ide__sti(); /* local CPU only */
+ if ((stat & DRQ_STAT) && args && args[3]) {
+ byte io_32bit = drive->io_32bit;
+ drive->io_32bit = 0;
+ ide_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
+ drive->io_32bit = io_32bit;
+ while (((stat = GET_STAT()) & BUSY_STAT) && retries--)
+ udelay(100);
+ }
+
+ if (!OK_STAT(stat, READY_STAT, BAD_STAT))
+ return ide_error(drive, "drive_cmd", stat); /* calls ide_end_drive_cmd */
+ ide_end_drive_cmd (drive, stat, GET_ERR());
+ return ide_stopped;
+}
+
+/*
+ * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
+ * commands to a drive. It used to do much more, but has been scaled back.
+ */
+static ide_startstop_t do_special (ide_drive_t *drive)
+{
+ special_t *s = &drive->special;
+
+#ifdef DEBUG
+ printk("%s: do_special: 0x%02x\n", drive->name, s->all);
+#endif
+ if (s->b.set_tune) {
+ ide_tuneproc_t *tuneproc = HWIF(drive)->tuneproc;
+ s->b.set_tune = 0;
+ if (tuneproc != NULL)
+ tuneproc(drive, drive->tune_req);
+ } else if (drive->driver != NULL) {
+ return DRIVER(drive)->special(drive);
+ } else if (s->all) {
+ printk("%s: bad special flag: 0x%02x\n", drive->name, s->all);
+ s->all = 0;
+ }
+ return ide_stopped;
+}
+
+/*
+ * This routine busy-waits for the drive status to be not "busy".
+ * It then checks the status for all of the "good" bits and none
+ * of the "bad" bits, and if all is okay it returns 0. All other
+ * cases return 1 after invoking ide_error() -- caller should just return.
+ *
+ * This routine should get fixed to not hog the cpu during extra long waits..
+ * That could be done by busy-waiting for the first jiffy or two, and then
+ * setting a timer to wake up at half second intervals thereafter,
+ * until timeout is achieved, before timing out.
+ */
+int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, byte good, byte bad, unsigned long timeout) {
+ byte stat;
+ int i;
+ unsigned long flags;
+
+ udelay(1); /* spec allows drive 400ns to assert "BUSY" */
+ if ((stat = GET_STAT()) & BUSY_STAT) {
+ __save_flags(flags); /* local CPU only */
+ ide__sti(); /* local CPU only */
+ timeout += jiffies;
+ while ((stat = GET_STAT()) & BUSY_STAT) {
+ if (0 < (signed long)(jiffies - timeout)) {
+ __restore_flags(flags); /* local CPU only */
+ *startstop = ide_error(drive, "status timeout", stat);
+ return 1;
+ }
+ }
+ __restore_flags(flags); /* local CPU only */
+ }
+ /*
+ * Allow status to settle, then read it again.
+ * A few rare drives vastly violate the 400ns spec here,
+ * so we'll wait up to 10usec for a "good" status
+ * rather than expensively fail things immediately.
+ * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
+ */
+ for (i = 0; i < 10; i++) {
+ udelay(1);
+ if (OK_STAT((stat = GET_STAT()), good, bad))
+ return 0;
+ }
+ *startstop = ide_error(drive, "status error", stat);
+ return 1;
+}
+
+/*
+ * execute_drive_cmd() issues a special drive command,
+ * usually initiated by ioctl() from the external hdparm program.
+ */
+static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, struct request *rq)
+{
+ byte *args = rq->buffer;
+ if (args) {
+#ifdef DEBUG
+ printk("%s: DRIVE_CMD cmd=0x%02x sc=0x%02x fr=0x%02x xx=0x%02x\n",
+ drive->name, args[0], args[1], args[2], args[3]);
+#endif
+ if (args[0] == WIN_SMART) {
+ OUT_BYTE(0x4f, IDE_LCYL_REG);
+ OUT_BYTE(0xc2, IDE_HCYL_REG);
+ OUT_BYTE(args[2],IDE_FEATURE_REG);
+ OUT_BYTE(args[1],IDE_SECTOR_REG);
+ ide_cmd(drive, args[0], args[3], &drive_cmd_intr);
+ return ide_started;
+ }
+ OUT_BYTE(args[2],IDE_FEATURE_REG);
+ ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
+ return ide_started;
+ } else {
+ /*
+ * NULL is actually a valid way of waiting for
+ * all current requests to be flushed from the queue.
+ */
+#ifdef DEBUG
+ printk("%s: DRIVE_CMD (null)\n", drive->name);
+#endif
+ ide_end_drive_cmd(drive, GET_STAT(), GET_ERR());
+ return ide_stopped;
+ }
+}
+
+/*
+ * start_request() initiates handling of a new I/O request
+ */
+static ide_startstop_t start_request (ide_drive_t *drive)
+{
+ ide_startstop_t startstop;
+ unsigned long block, blockend;
+ struct request *rq = blkdev_entry_next_request(&drive->queue.queue_head);
+ unsigned int minor = MINOR(rq->rq_dev), unit = minor >> PARTN_BITS;
+ ide_hwif_t *hwif = HWIF(drive);
+
+#ifdef DEBUG
+ printk("%s: start_request: current=0x%08lx\n", hwif->name, (unsigned long) rq);
+#endif
+ if (unit >= MAX_DRIVES) {
+ printk("%s: bad device number: %s\n", hwif->name, kdevname(rq->rq_dev));
+ goto kill_rq;
+ }
+#ifdef DEBUG
+ if (rq->bh && !buffer_locked(rq->bh)) {
+ printk("%s: block not locked\n", drive->name);
+ goto kill_rq;
+ }
+#endif
+ block = rq->sector;
+ blockend = block + rq->nr_sectors;
+#if 0
+ if ((rq->cmd == READ || rq->cmd == WRITE) &&
+ (drive->media == ide_disk || drive->media == ide_floppy))
+#endif
+ {
+ if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
+ printk("%s%c: bad access: block=%ld, count=%ld\n", drive->name,
+ (minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
+ goto kill_rq;
+ }
+ block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
+ }
+ /* Yecch - this will shift the entire interval,
+ possibly killing some innocent following sector */
+ if (block == 0 && drive->remap_0_to_1 == 1)
+ block = 1; /* redirect MBR access to EZ-Drive partn table */
+
+#if (DISK_RECOVERY_TIME > 0)
+ while ((read_timer() - hwif->last_time) < DISK_RECOVERY_TIME);
+#endif
+
+ SELECT_DRIVE(hwif, drive);
+ if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
+ printk("%s: drive not ready for command\n", drive->name);
+ return startstop;
+ }
+ if (!drive->special.all) {
+ if (rq->cmd == IDE_DRIVE_CMD) {
+ return execute_drive_cmd(drive, rq);
+ }
+ if (drive->driver != NULL) {
+ return (DRIVER(drive)->do_request(drive, rq, block));
+ }
+ printk("%s: media type %d not supported\n", drive->name, drive->media);
+ goto kill_rq;
+ }
+ return do_special(drive);
+kill_rq:
+ if (drive->driver != NULL)
+ DRIVER(drive)->end_request(0, HWGROUP(drive));
+ else
+ ide_end_request(0, HWGROUP(drive));
+ return ide_stopped;
+}
+
+/*
+ * ide_stall_queue() can be used by a drive to give excess bandwidth back
+ * to the hwgroup by sleeping for timeout jiffies.
+ */
+void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
+{
+ if (timeout > WAIT_WORSTCASE)
+ timeout = WAIT_WORSTCASE;
+ drive->sleep = timeout + jiffies;
+}
+
+#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
+
+/*
+ * choose_drive() selects the next drive which will be serviced.
+ */
+static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
+{
+ ide_drive_t *drive, *best;
+
+repeat:
+ best = NULL;
+ drive = hwgroup->drive;
+ do {
+ if (!list_empty(&drive->queue.queue_head) && (!drive->sleep || 0 <= (signed long)(jiffies - drive->sleep))) {
+ if (!best
+ || (drive->sleep && (!best->sleep || 0 < (signed long)(best->sleep - drive->sleep)))
+ || (!best->sleep && 0 < (signed long)(WAKEUP(best) - WAKEUP(drive))))
+ {
+ if( !drive->queue.plugged )
+ best = drive;
+ }
+ }
+ } while ((drive = drive->next) != hwgroup->drive);
+ if (best && best->nice1 && !best->sleep && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
+ long t = (signed long)(WAKEUP(best) - jiffies);
+ if (t >= WAIT_MIN_SLEEP) {
+ /*
+ * We *may* have some time to spare, but first let's see if
+ * someone can potentially benefit from our nice mood today..
+ */
+ drive = best->next;
+ do {
+ if (!drive->sleep
+ && 0 < (signed long)(WAKEUP(drive) - (jiffies - best->service_time))
+ && 0 < (signed long)((jiffies + t) - WAKEUP(drive)))
+ {
+ ide_stall_queue(best, IDE_MIN(t, 10 * WAIT_MIN_SLEEP));
+ goto repeat;
+ }
+ } while ((drive = drive->next) != best);
+ }
+ }
+ return best;
+}
+
+/*
+ * Issue a new request to a drive from hwgroup
+ * Caller must have already done spin_lock_irqsave(&io_request_lock, ..);
+ *
+ * A hwgroup is a serialized group of IDE interfaces. Usually there is
+ * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
+ * may have both interfaces in a single hwgroup to "serialize" access.
+ * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
+ * together into one hwgroup for serialized access.
+ *
+ * Note also that several hwgroups can end up sharing a single IRQ,
+ * possibly along with many other devices. This is especially common in
+ * PCI-based systems with off-board IDE controller cards.
+ *
+ * The IDE driver uses the single global io_request_lock spinlock to protect
+ * access to the request queues, and to protect the hwgroup->busy flag.
+ *
+ * The first thread into the driver for a particular hwgroup sets the
+ * hwgroup->busy flag to indicate that this hwgroup is now active,
+ * and then initiates processing of the top request from the request queue.
+ *
+ * Other threads attempting entry notice the busy setting, and will simply
+ * queue their new requests and exit immediately. Note that hwgroup->busy
+ * remains set even when the driver is merely awaiting the next interrupt.
+ * Thus, the meaning is "this hwgroup is busy processing a request".
+ *
+ * When processing of a request completes, the completing thread or IRQ-handler
+ * will start the next request from the queue. If no more work remains,
+ * the driver will clear the hwgroup->busy flag and exit.
+ *
+ * The io_request_lock (spinlock) is used to protect all access to the
+ * hwgroup->busy flag, but is otherwise not needed for most processing in
+ * the driver. This makes the driver much more friendlier to shared IRQs
+ * than previous designs, while remaining 100% (?) SMP safe and capable.
+ */
+static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
+{
+ ide_drive_t *drive;
+ ide_hwif_t *hwif;
+ ide_startstop_t startstop;
+
+ ide_get_lock(&ide_lock, ide_intr, hwgroup); /* for atari only: POSSIBLY BROKEN HERE(?) */
+
+ __cli(); /* necessary paranoia: ensure IRQs are masked on local CPU */
+
+ while (!hwgroup->busy) {
+ hwgroup->busy = 1;
+ drive = choose_drive(hwgroup);
+ if (drive == NULL) {
+ unsigned long sleep = 0;
+ hwgroup->rq = NULL;
+ drive = hwgroup->drive;
+ do {
+ if (drive->sleep && (!sleep || 0 < (signed long)(sleep - drive->sleep)))
+ sleep = drive->sleep;
+ } while ((drive = drive->next) != hwgroup->drive);
+ if (sleep) {
+ /*
+ * Take a short snooze, and then wake up this hwgroup again.
+ * This gives other hwgroups on the same a chance to
+ * play fairly with us, just in case there are big differences
+ * in relative throughputs.. don't want to hog the cpu too much.
+ */
+ if (0 < (signed long)(jiffies + WAIT_MIN_SLEEP - sleep))
+ sleep = jiffies + WAIT_MIN_SLEEP;
+#if 1
+ if (hwgroup->timer.next || hwgroup->timer.prev)
+ printk("ide_set_handler: timer already active\n");
+#endif
+ hwgroup->sleeping = 1; /* so that ide_timer_expiry knows what to do */
+ mod_timer(&hwgroup->timer, sleep);
+ /* we purposely leave hwgroup->busy==1 while sleeping */
+ } else {
+ /* Ugly, but how can we sleep for the lock otherwise? perhaps from tq_scheduler? */
+ ide_release_lock(&ide_lock); /* for atari only */
+ hwgroup->busy = 0;
+ }
+ return; /* no more work for this hwgroup (for now) */
+ }
+ hwif = HWIF(drive);
+ if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif && hwif->io_ports[IDE_CONTROL_OFFSET]) {
+ /* set nIEN for previous hwif */
+ OUT_BYTE(hwgroup->drive->ctl|2, hwgroup->hwif->io_ports[IDE_CONTROL_OFFSET]);
+ }
+ hwgroup->hwif = hwif;
+ hwgroup->drive = drive;
+ drive->sleep = 0;
+ drive->service_start = jiffies;
+
+ if ( drive->queue.plugged ) /* paranoia */
+ printk("%s: Huh? nuking plugged queue\n", drive->name);
+ hwgroup->rq = blkdev_entry_next_request(&drive->queue.queue_head);
+ /*
+ * Some systems have trouble with IDE IRQs arriving while
+ * the driver is still setting things up. So, here we disable
+ * the IRQ used by this interface while the request is being started.
+ * This may look bad at first, but pretty much the same thing
+ * happens anyway when any interrupt comes in, IDE or otherwise
+ * -- the kernel masks the IRQ while it is being handled.
+ */
+ if (hwif->irq != masked_irq)
+ disable_irq_nosync(hwif->irq);
+ spin_unlock(&io_request_lock);
+ ide__sti(); /* allow other IRQs while we start this request */
+ startstop = start_request(drive);
+ spin_lock_irq(&io_request_lock);
+ if (hwif->irq != masked_irq)
+ enable_irq(hwif->irq);
+ if (startstop == ide_stopped)
+ hwgroup->busy = 0;
+ }
+}
+
+/*
+ * ide_get_queue() returns the queue which corresponds to a given device.
+ */
+request_queue_t *ide_get_queue (kdev_t dev)
+{
+ ide_hwif_t *hwif = (ide_hwif_t *)blk_dev[MAJOR(dev)].data;
+
+ return &hwif->drives[DEVICE_NR(dev) & 1].queue;
+}
+
+void do_ide0_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[0].hwgroup, 0);
+}
+
+#if MAX_HWIFS > 1
+void do_ide1_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[1].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 1 */
+
+#if MAX_HWIFS > 2
+void do_ide2_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[2].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 2 */
+
+#if MAX_HWIFS > 3
+void do_ide3_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[3].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 3 */
+
+#if MAX_HWIFS > 4
+void do_ide4_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[4].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 4 */
+
+#if MAX_HWIFS > 5
+void do_ide5_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[5].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 5 */
+
+#if MAX_HWIFS > 6
+void do_ide6_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[6].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 6 */
+
+#if MAX_HWIFS > 7
+void do_ide7_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[7].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 7 */
+
+#if MAX_HWIFS > 8
+void do_ide8_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[8].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 8 */
+
+#if MAX_HWIFS > 9
+void do_ide9_request (request_queue_t *q)
+{
+ ide_do_request (ide_hwifs[9].hwgroup, 0);
+}
+#endif /* MAX_HWIFS > 9 */
+
+/*
+ * ide_timer_expiry() is our timeout function for all drive operations.
+ * But note that it can also be invoked as a result of a "sleep" operation
+ * triggered by the mod_timer() call in ide_do_request.
+ */
+void ide_timer_expiry (unsigned long data)
+{
+ ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
+ ide_handler_t *handler;
+ ide_expiry_t *expiry;
+ unsigned long flags;
+ unsigned long wait;
+
+ spin_lock_irqsave(&io_request_lock, flags);
+ del_timer(&hwgroup->timer);
+
+ if ((handler = hwgroup->handler) == NULL) {
+ /*
+ * Either a marginal timeout occured
+ * (got the interrupt just as timer expired),
+ * or we were "sleeping" to give other devices a chance.
+ * Either way, we don't really want to complain about anything.
+ */
+ if (hwgroup->sleeping) {
+ hwgroup->sleeping = 0;
+ hwgroup->busy = 0;
+ }
+ } else {
+ ide_drive_t *drive = hwgroup->drive;
+ if (!drive) {
+ printk("ide_timer_expiry: hwgroup->drive was NULL\n");
+ hwgroup->handler = NULL;
+ } else {
+ ide_hwif_t *hwif;
+ ide_startstop_t startstop;
+ if (!hwgroup->busy) {
+ hwgroup->busy = 1; /* paranoia */
+ printk("%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
+ }
+ if ((expiry = hwgroup->expiry) != NULL) {
+ /* continue */
+ if ((wait = expiry(drive)) != 0) {
+ /* reset timer */
+ hwgroup->timer.expires = jiffies + wait;
+ add_timer(&hwgroup->timer);
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return;
+ }
+ }
+ hwgroup->handler = NULL;
+ /*
+ * We need to simulate a real interrupt when invoking
+ * the handler() function, which means we need to globally
+ * mask the specific IRQ:
+ */
+ spin_unlock(&io_request_lock);
+ hwif = HWIF(drive);
+ disable_irq(hwif->irq); /* disable_irq_nosync ?? */
+ __cli(); /* local CPU only, as if we were handling an interrupt */
+ if (hwgroup->poll_timeout != 0) {
+ startstop = handler(drive);
+ } else if (drive_is_ready(drive)) {
+ if (drive->waiting_for_dma)
+ (void) hwgroup->hwif->dmaproc(ide_dma_lostirq, drive);
+ (void)ide_ack_intr(hwif);
+ printk("%s: lost interrupt\n", drive->name);
+ startstop = handler(drive);
+ } else {
+ if (drive->waiting_for_dma) {
+ (void) hwgroup->hwif->dmaproc(ide_dma_end, drive);
+ printk("%s: timeout waiting for DMA\n", drive->name);
+ (void) hwgroup->hwif->dmaproc(ide_dma_timeout, drive);
+ }
+ startstop = ide_error(drive, "irq timeout", GET_STAT());
+ }
+ set_recovery_timer(hwif);
+ drive->service_time = jiffies - drive->service_start;
+ enable_irq(hwif->irq);
+ spin_lock_irq(&io_request_lock);
+ if (startstop == ide_stopped)
+ hwgroup->busy = 0;
+ }
+ }
+ ide_do_request(hwgroup, 0);
+ spin_unlock_irqrestore(&io_request_lock, flags);
+}
+
+/*
+ * There's nothing really useful we can do with an unexpected interrupt,
+ * other than reading the status register (to clear it), and logging it.
+ * There should be no way that an irq can happen before we're ready for it,
+ * so we needn't worry much about losing an "important" interrupt here.
+ *
+ * On laptops (and "green" PCs), an unexpected interrupt occurs whenever the
+ * drive enters "idle", "standby", or "sleep" mode, so if the status looks
+ * "good", we just ignore the interrupt completely.
+ *
+ * This routine assumes __cli() is in effect when called.
+ *
+ * If an unexpected interrupt happens on irq15 while we are handling irq14
+ * and if the two interfaces are "serialized" (CMD640), then it looks like
+ * we could screw up by interfering with a new request being set up for irq15.
+ *
+ * In reality, this is a non-issue. The new command is not sent unless the
+ * drive is ready to accept one, in which case we know the drive is not
+ * trying to interrupt us. And ide_set_handler() is always invoked before
+ * completing the issuance of any new drive command, so we will not be
+ * accidently invoked as a result of any valid command completion interrupt.
+ *
+ */
+static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
+{
+ byte stat;
+ ide_hwif_t *hwif = hwgroup->hwif;
+
+ /*
+ * handle the unexpected interrupt
+ */
+ do {
+ if (hwif->irq == irq) {
+ stat = IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
+ if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
+ /* Try to not flood the console with msgs */
+ static unsigned long last_msgtime = 0, count = 0;
+ ++count;
+ if (0 < (signed long)(jiffies - (last_msgtime + HZ))) {
+ last_msgtime = jiffies;
+ printk("%s%s: unexpected interrupt, status=0x%02x, count=%ld\n",
+ hwif->name, (hwif->next == hwgroup->hwif) ? "" : "(?)", stat, count);
+ }
+ }
+ }
+ } while ((hwif = hwif->next) != hwgroup->hwif);
+}
+
+/*
+ * entry point for all interrupts, caller does __cli() for us
+ */
+void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
+{
+ unsigned long flags;
+ ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
+ ide_hwif_t *hwif;
+ ide_drive_t *drive;
+ ide_handler_t *handler;
+ ide_startstop_t startstop;
+
+ spin_lock_irqsave(&io_request_lock, flags);
+ hwif = hwgroup->hwif;
+
+ if (!ide_ack_intr(hwif)) {
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return;
+ }
+
+ if ((handler = hwgroup->handler) == NULL || hwgroup->poll_timeout != 0) {
+ /*
+ * Not expecting an interrupt from this drive.
+ * That means this could be:
+ * (1) an interrupt from another PCI device
+ * sharing the same PCI INT# as us.
+ * or (2) a drive just entered sleep or standby mode,
+ * and is interrupting to let us know.
+ * or (3) a spurious interrupt of unknown origin.
+ *
+ * For PCI, we cannot tell the difference,
+ * so in that case we just ignore it and hope it goes away.
+ */
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ if (IDE_PCI_DEVID_EQ(hwif->pci_devid, IDE_PCI_DEVID_NULL))
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ {
+ /*
+ * Probably not a shared PCI interrupt,
+ * so we can safely try to do something about it:
+ */
+ unexpected_intr(irq, hwgroup);
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ } else {
+ /*
+ * Whack the status register, just in case we have a leftover pending IRQ.
+ */
+ (void) IN_BYTE(hwif->io_ports[IDE_STATUS_OFFSET]);
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ }
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return;
+ }
+ drive = hwgroup->drive;
+ if (!drive) {
+ /*
+ * This should NEVER happen, and there isn't much we could do about it here.
+ */
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return;
+ }
+ if (!drive_is_ready(drive)) {
+ /*
+ * This happens regularly when we share a PCI IRQ with another device.
+ * Unfortunately, it can also happen with some buggy drives that trigger
+ * the IRQ before their status register is up to date. Hopefully we have
+ * enough advance overhead that the latter isn't a problem.
+ */
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return;
+ }
+ if (!hwgroup->busy) {
+ hwgroup->busy = 1; /* paranoia */
+ printk("%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
+ }
+ hwgroup->handler = NULL;
+ del_timer(&hwgroup->timer);
+ spin_unlock(&io_request_lock);
+
+ if (drive->unmask)
+ ide__sti(); /* local CPU only */
+ startstop = handler(drive); /* service this interrupt, may set handler for next interrupt */
+ spin_lock_irq(&io_request_lock);
+
+ /*
+ * Note that handler() may have set things up for another
+ * interrupt to occur soon, but it cannot happen until
+ * we exit from this routine, because it will be the
+ * same irq as is currently being serviced here, and Linux
+ * won't allow another of the same (on any CPU) until we return.
+ */
+ set_recovery_timer(HWIF(drive));
+ drive->service_time = jiffies - drive->service_start;
+ if (startstop == ide_stopped) {
+ if (hwgroup->handler == NULL) { /* paranoia */
+ hwgroup->busy = 0;
+ ide_do_request(hwgroup, hwif->irq);
+ } else {
+ printk("%s: ide_intr: huh? expected NULL handler on exit\n", drive->name);
+ }
+ }
+ spin_unlock_irqrestore(&io_request_lock, flags);
+}
+
+/*
+ * get_info_ptr() returns the (ide_drive_t *) for a given device number.
+ * It returns NULL if the given device number does not match any present drives.
+ */
+ide_drive_t *get_info_ptr (kdev_t i_rdev)
+{
+ int major = MAJOR(i_rdev);
+#if 0
+ int minor = MINOR(i_rdev) & PARTN_MASK;
+#endif
+ unsigned int h;
+
+ for (h = 0; h < MAX_HWIFS; ++h) {
+ ide_hwif_t *hwif = &ide_hwifs[h];
+ if (hwif->present && major == hwif->major) {
+ unsigned unit = DEVICE_NR(i_rdev);
+ if (unit < MAX_DRIVES) {
+ ide_drive_t *drive = &hwif->drives[unit];
+#if 0
+ if ((drive->present) && (drive->part[minor].nr_sects))
+#else
+ if (drive->present)
+#endif
+ return drive;
+ }
+ break;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * This function is intended to be used prior to invoking ide_do_drive_cmd().
+ */
+void ide_init_drive_cmd (struct request *rq)
+{
+ 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->q = NULL;
+}
+
+/*
+ * This function issues a special IDE device request
+ * onto the request queue.
+ *
+ * If action is ide_wait, then the rq is queued at the end of the
+ * request queue, and the function sleeps until it has been processed.
+ * This is for use when invoked from an ioctl handler.
+ *
+ * If action is ide_preempt, then the rq is queued at the head of
+ * the request queue, displacing the currently-being-processed
+ * request and this function returns immediately without waiting
+ * for the new rq to be completed. This is VERY DANGEROUS, and is
+ * intended for careful use by the ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_next, then the rq is queued immediately after
+ * the currently-being-processed-request (if any), and the function
+ * returns without waiting for the new rq to be completed. As above,
+ * This is VERY DANGEROUS, and is intended for careful use by the
+ * ATAPI tape/cdrom driver code.
+ *
+ * If action is ide_end, then the rq is queued at the end of the
+ * request queue, and the function returns immediately without waiting
+ * for the new rq to be completed. This is again intended for careful
+ * use by the ATAPI tape/cdrom driver code.
+ */
+int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
+{
+ unsigned long flags;
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+ unsigned int major = HWIF(drive)->major;
+ struct list_head * queue_head;
+ DECLARE_MUTEX_LOCKED(sem);
+
+#ifdef CONFIG_BLK_DEV_PDC4030
+ if (HWIF(drive)->chipset == ide_pdc4030 && rq->buffer != NULL)
+ return -ENOSYS; /* special drive cmds not supported */
+#endif
+ rq->errors = 0;
+ rq->rq_status = RQ_ACTIVE;
+ rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
+ if (action == ide_wait)
+ rq->sem = &sem;
+ spin_lock_irqsave(&io_request_lock, flags);
+ queue_head = &drive->queue.queue_head;
+ if (list_empty(queue_head) || action == ide_preempt) {
+ if (action == ide_preempt)
+ hwgroup->rq = NULL;
+ } else {
+ if (action == ide_wait || action == ide_end) {
+ queue_head = queue_head->prev;
+ } else
+ queue_head = queue_head->next;
+ }
+ list_add(&rq->queue, queue_head);
+ ide_do_request(hwgroup, 0);
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ if (action == ide_wait) {
+ down(&sem); /* wait for it to be serviced */
+ return rq->errors ? -EIO : 0; /* return -EIO if errors */
+ }
+ return 0;
+
+}
+
+/*
+ * This routine is called to flush all partitions and partition tables
+ * for a changed disk, and then re-read the new partition table.
+ * If we are revalidating a disk because of a media change, then we
+ * enter with usage == 0. If we are using an ioctl, we automatically have
+ * usage == 1 (we need an open channel to use an ioctl :-), so this
+ * is our limit.
+ */
+int ide_revalidate_disk (kdev_t i_rdev)
+{
+ ide_drive_t *drive;
+ ide_hwgroup_t *hwgroup;
+ unsigned int p, major, minor;
+ long flags;
+
+ if ((drive = get_info_ptr(i_rdev)) == NULL)
+ return -ENODEV;
+ major = MAJOR(i_rdev);
+ minor = drive->select.b.unit << PARTN_BITS;
+ hwgroup = HWGROUP(drive);
+ spin_lock_irqsave(&io_request_lock, flags);
+ if (drive->busy || (drive->usage > 1)) {
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return -EBUSY;
+ };
+ drive->busy = 1;
+ MOD_INC_USE_COUNT;
+ spin_unlock_irqrestore(&io_request_lock, flags);
+
+ for (p = 0; p < (1<<PARTN_BITS); ++p) {
+ if (drive->part[p].nr_sects > 0) {
+ kdev_t devp = MKDEV(major, minor+p);
+ struct super_block * sb = get_super(devp);
+ fsync_dev (devp);
+ if (sb)
+ invalidate_inodes(sb);
+ invalidate_buffers (devp);
+ set_blocksize(devp, 1024);
+ }
+ drive->part[p].start_sect = 0;
+ drive->part[p].nr_sects = 0;
+ };
+
+ grok_partitions(HWIF(drive)->gd, drive->select.b.unit,
+ (drive->media != ide_disk &&
+ drive->media != ide_floppy) ? 1 : 1<<PARTN_BITS,
+ current_capacity(drive));
+
+ drive->busy = 0;
+ wake_up(&drive->wqueue);
+ MOD_DEC_USE_COUNT;
+ return 0;
+}
+
+static void revalidate_drives (void)
+{
+ ide_hwif_t *hwif;
+ ide_drive_t *drive;
+ int index, unit;
+
+ for (index = 0; index < MAX_HWIFS; ++index) {
+ hwif = &ide_hwifs[index];
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ drive = &ide_hwifs[index].drives[unit];
+ if (drive->revalidate) {
+ drive->revalidate = 0;
+ if (!initializing)
+ (void) ide_revalidate_disk(MKDEV(hwif->major, unit<<PARTN_BITS));
+ }
+ }
+ }
+}
+
+static void ide_probe_module (void)
+{
+ if (!ide_probe) {
+#ifdef CONFIG_KMOD
+ (void) request_module("ide-probe-mod");
+#endif /* CONFIG_KMOD */
+ } else {
+ (void) ide_probe->init();
+ }
+ revalidate_drives();
+}
+
+static void ide_driver_module (void)
+{
+ int index;
+ ide_module_t *module = ide_modules;
+
+ for (index = 0; index < MAX_HWIFS; ++index)
+ if (ide_hwifs[index].present)
+ goto search;
+ ide_probe_module();
+search:
+ while (module) {
+ (void) module->init();
+ module = module->next;
+ }
+ revalidate_drives();
+}
+
+static int ide_open (struct inode * inode, struct file * filp)
+{
+ ide_drive_t *drive;
+ int rc;
+
+ if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
+ return -ENXIO;
+ MOD_INC_USE_COUNT;
+ if (drive->driver == NULL)
+ ide_driver_module();
+#ifdef CONFIG_KMOD
+ if (drive->driver == NULL) {
+ if (drive->media == ide_disk)
+ (void) request_module("ide-disk");
+ if (drive->media == ide_cdrom)
+ (void) request_module("ide-cd");
+ if (drive->media == ide_tape)
+ (void) request_module("ide-tape");
+ if (drive->media == ide_floppy)
+ (void) request_module("ide-floppy");
+ }
+#endif /* CONFIG_KMOD */
+ while (drive->busy)
+ sleep_on(&drive->wqueue);
+ drive->usage++;
+ if (drive->driver != NULL) {
+ if ((rc = DRIVER(drive)->open(inode, filp, drive)))
+ MOD_DEC_USE_COUNT;
+ return rc;
+ }
+ printk ("%s: driver not present\n", drive->name);
+ drive->usage--;
+ MOD_DEC_USE_COUNT;
+ return -ENXIO;
+}
+
+/*
+ * Releasing a block device means we sync() it, so that it can safely
+ * be forgotten about...
+ */
+static int ide_release (struct inode * inode, struct file * file)
+{
+ ide_drive_t *drive;
+
+ if ((drive = get_info_ptr(inode->i_rdev)) != NULL) {
+ drive->usage--;
+ if (drive->driver != NULL)
+ DRIVER(drive)->release(inode, file, drive);
+ MOD_DEC_USE_COUNT;
+ }
+ return 0;
+}
+
+int ide_replace_subdriver (ide_drive_t *drive, const char *driver)
+{
+ if (!drive->present || drive->busy || drive->usage)
+ goto abort;
+ if (drive->driver != NULL && DRIVER(drive)->cleanup(drive))
+ goto abort;
+ strncpy(drive->driver_req, driver, 9);
+ ide_driver_module();
+ drive->driver_req[0] = 0;
+ ide_driver_module();
+ if (DRIVER(drive) && !strcmp(DRIVER(drive)->name, driver))
+ return 0;
+abort:
+ return 1;
+}
+
+#ifdef CONFIG_PROC_FS
+ide_proc_entry_t generic_subdriver_entries[] = {
+ { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
+ { NULL, 0, NULL, NULL }
+};
+#endif
+
+/*
+ * Note that we only release the standard ports,
+ * and do not even try to handle any extra ports
+ * allocated for weird IDE interface chipsets.
+ */
+void hwif_unregister (ide_hwif_t *hwif)
+{
+ if (hwif->straight8) {
+ ide_release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
+ goto jump_eight;
+ }
+ if (hwif->io_ports[IDE_DATA_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_DATA_OFFSET], 1);
+ if (hwif->io_ports[IDE_ERROR_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_ERROR_OFFSET], 1);
+ if (hwif->io_ports[IDE_NSECTOR_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_NSECTOR_OFFSET], 1);
+ if (hwif->io_ports[IDE_SECTOR_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_SECTOR_OFFSET], 1);
+ if (hwif->io_ports[IDE_LCYL_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_LCYL_OFFSET], 1);
+ if (hwif->io_ports[IDE_HCYL_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_HCYL_OFFSET], 1);
+ if (hwif->io_ports[IDE_SELECT_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_SELECT_OFFSET], 1);
+ if (hwif->io_ports[IDE_STATUS_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_STATUS_OFFSET], 1);
+jump_eight:
+ if (hwif->io_ports[IDE_CONTROL_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
+ if (hwif->io_ports[IDE_IRQ_OFFSET])
+ ide_release_region(hwif->io_ports[IDE_IRQ_OFFSET], 1);
+}
+
+void ide_unregister (unsigned int index)
+{
+ struct gendisk *gd, **gdp;
+ ide_drive_t *drive, *d;
+ ide_hwif_t *hwif, *g;
+ ide_hwgroup_t *hwgroup;
+ int irq_count = 0, unit, i;
+ unsigned long flags;
+ unsigned int p, minor;
+ ide_hwif_t old_hwif;
+
+ if (index >= MAX_HWIFS)
+ return;
+ save_flags(flags); /* all CPUs */
+ cli(); /* all CPUs */
+ hwif = &ide_hwifs[index];
+ if (!hwif->present)
+ goto abort;
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ drive = &hwif->drives[unit];
+ if (!drive->present)
+ continue;
+ if (drive->busy || drive->usage)
+ goto abort;
+ if (drive->driver != NULL && DRIVER(drive)->cleanup(drive))
+ goto abort;
+ }
+ hwif->present = 0;
+
+ /*
+ * All clear? Then blow away the buffer cache
+ */
+ sti();
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ drive = &hwif->drives[unit];
+ if (!drive->present)
+ continue;
+ minor = drive->select.b.unit << PARTN_BITS;
+ for (p = 0; p < (1<<PARTN_BITS); ++p) {
+ if (drive->part[p].nr_sects > 0) {
+ kdev_t devp = MKDEV(hwif->major, minor+p);
+ struct super_block * sb = get_super(devp);
+ if (sb) invalidate_inodes(sb);
+ invalidate_buffers (devp);
+ }
+ }
+#ifdef CONFIG_PROC_FS
+ destroy_proc_ide_drives(hwif);
+#endif
+ }
+ cli();
+ hwgroup = hwif->hwgroup;
+
+ /*
+ * free the irq if we were the only hwif using it
+ */
+ g = hwgroup->hwif;
+ do {
+ if (g->irq == hwif->irq)
+ ++irq_count;
+ g = g->next;
+ } while (g != hwgroup->hwif);
+ if (irq_count == 1)
+ free_irq(hwif->irq, hwgroup);
+
+ /*
+ * Note that we only release the standard ports,
+ * and do not even try to handle any extra ports
+ * allocated for weird IDE interface chipsets.
+ */
+ hwif_unregister(hwif);
+
+ /*
+ * Remove us from the hwgroup, and free
+ * the hwgroup if we were the only member
+ */
+ d = hwgroup->drive;
+ for (i = 0; i < MAX_DRIVES; ++i) {
+ drive = &hwif->drives[i];
+ if (drive->de) {
+ devfs_unregister (drive->de);
+ drive->de = NULL;
+ }
+ if (!drive->present)
+ continue;
+ while (hwgroup->drive->next != drive)
+ hwgroup->drive = hwgroup->drive->next;
+ hwgroup->drive->next = drive->next;
+ if (hwgroup->drive == drive)
+ hwgroup->drive = NULL;
+ if (drive->id != NULL) {
+ kfree(drive->id);
+ drive->id = NULL;
+ }
+ drive->present = 0;
+ }
+ if (d->present)
+ hwgroup->drive = d;
+ while (hwgroup->hwif->next != hwif)
+ hwgroup->hwif = hwgroup->hwif->next;
+ hwgroup->hwif->next = hwif->next;
+ if (hwgroup->hwif == hwif)
+ kfree(hwgroup);
+ else
+ hwgroup->hwif = HWIF(hwgroup->drive);
+
+#ifdef CONFIG_BLK_DEV_IDEDMA
+ if (hwif->dma_base)
+ (void) ide_release_dma(hwif);
+#endif /* CONFIG_BLK_DEV_IDEDMA */
+
+ /*
+ * Remove us from the kernel's knowledge
+ */
+ unregister_blkdev(hwif->major, hwif->name);
+ kfree(blksize_size[hwif->major]);
+ kfree(max_sectors[hwif->major]);
+ kfree(max_readahead[hwif->major]);
+ blk_cleanup_queue(BLK_DEFAULT_QUEUE(hwif->major));
+ blk_dev[hwif->major].data = NULL;
+ blk_dev[hwif->major].queue = 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);
+ if (gd->de_arr)
+ kfree (gd->de_arr);
+ if (gd->flags)
+ kfree (gd->flags);
+ kfree(gd);
+ }
+ old_hwif = *hwif;
+ init_hwif_data (index); /* restore hwif data to pristine status */
+ hwif->hwgroup = old_hwif.hwgroup;
+ hwif->tuneproc = old_hwif.tuneproc;
+ hwif->selectproc = old_hwif.selectproc;
+ hwif->resetproc = old_hwif.resetproc;
+ hwif->dmaproc = old_hwif.dmaproc;
+ hwif->dma_base = old_hwif.dma_base;
+ hwif->dma_extra = old_hwif.dma_extra;
+ hwif->config_data = old_hwif.config_data;
+ hwif->select_data = old_hwif.select_data;
+ hwif->proc = old_hwif.proc;
+ hwif->irq = old_hwif.irq;
+ hwif->major = old_hwif.major;
+ hwif->chipset = old_hwif.chipset;
+ hwif->autodma = old_hwif.autodma;
+ hwif->udma_four = old_hwif.udma_four;
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ hwif->pci_dev = old_hwif.pci_dev;
+ hwif->pci_devid = old_hwif.pci_devid;
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ hwif->straight8 = old_hwif.straight8;
+
+abort:
+ restore_flags(flags); /* all CPUs */
+}
+
+/*
+ * Setup hw_regs_t structure described by parameters. You
+ * may set up the hw structure yourself OR use this routine to
+ * do it for you.
+ */
+void ide_setup_ports ( hw_regs_t *hw,
+ ide_ioreg_t base, int *offsets,
+ ide_ioreg_t ctrl, ide_ioreg_t intr,
+ ide_ack_intr_t *ack_intr, int irq)
+{
+ int i;
+
+ for (i = 0; i < IDE_NR_PORTS; i++) {
+ if (offsets[i] == -1) {
+ switch(i) {
+ case IDE_CONTROL_OFFSET:
+ hw->io_ports[i] = ctrl;
+ break;
+ case IDE_IRQ_OFFSET:
+ hw->io_ports[i] = intr;
+ break;
+ default:
+ hw->io_ports[i] = 0;
+ break;
+ }
+ } else {
+ hw->io_ports[i] = base + offsets[i];
+ }
+ }
+ hw->irq = irq;
+ hw->dma = NO_DMA;
+ hw->ack_intr = ack_intr;
+}
+
+/*
+ * Register an IDE interface, specifing exactly the registers etc
+ * Set init=1 iff calling before probes have taken place.
+ */
+int ide_register_hw (hw_regs_t *hw, ide_hwif_t **hwifp)
+{
+ int index, retry = 1;
+ ide_hwif_t *hwif;
+
+ do {
+ for (index = 0; index < MAX_HWIFS; ++index) {
+ hwif = &ide_hwifs[index];
+ if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
+ goto found;
+ }
+ for (index = 0; index < MAX_HWIFS; ++index) {
+ hwif = &ide_hwifs[index];
+ if ((!hwif->present && !hwif->mate && !initializing) ||
+ (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
+ goto found;
+ }
+ for (index = 0; index < MAX_HWIFS; index++)
+ ide_unregister(index);
+ } while (retry--);
+ return -1;
+found:
+ if (hwif->present)
+ ide_unregister(index);
+ if (hwif->present)
+ return -1;
+ memcpy(&hwif->hw, hw, sizeof(*hw));
+ memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
+ hwif->irq = hw->irq;
+ hwif->noprobe = 0;
+
+ if (!initializing) {
+ ide_probe_module();
+#ifdef CONFIG_PROC_FS
+ create_proc_ide_interfaces();
+#endif
+ ide_driver_module();
+ }
+
+ if (hwifp)
+ *hwifp = hwif;
+
+ return (initializing || hwif->present) ? index : -1;
+}
+
+/*
+ * Compatability function with existing drivers. If you want
+ * something different, use the function above.
+ */
+int ide_register (int arg1, int arg2, int irq)
+{
+ hw_regs_t hw;
+ ide_init_hwif_ports(&hw, (ide_ioreg_t) arg1, (ide_ioreg_t) arg2, NULL);
+ hw.irq = irq;
+ return ide_register_hw(&hw, NULL);
+}
+
+void ide_add_setting (ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
+{
+ ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
+
+ while ((*p) && strcmp((*p)->name, name) < 0)
+ p = &((*p)->next);
+ if ((setting = kmalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
+ goto abort;
+ memset(setting, 0, sizeof(*setting));
+ if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
+ goto abort;
+ strcpy(setting->name, name); setting->rw = rw;
+ setting->read_ioctl = read_ioctl; setting->write_ioctl = write_ioctl;
+ setting->data_type = data_type; setting->min = min;
+ setting->max = max; setting->mul_factor = mul_factor;
+ setting->div_factor = div_factor; setting->data = data;
+ setting->set = set; setting->next = *p;
+ if (drive->driver)
+ setting->auto_remove = 1;
+ *p = setting;
+ return;
+abort:
+ if (setting)
+ kfree(setting);
+}
+
+void ide_remove_setting (ide_drive_t *drive, char *name)
+{
+ ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting;
+
+ while ((*p) && strcmp((*p)->name, name))
+ p = &((*p)->next);
+ if ((setting = (*p)) == NULL)
+ return;
+ (*p) = setting->next;
+ kfree(setting->name);
+ kfree(setting);
+}
+
+static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
+{
+ ide_settings_t *setting = drive->settings;
+
+ while (setting) {
+ if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
+ break;
+ setting = setting->next;
+ }
+ return setting;
+}
+
+ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
+{
+ ide_settings_t *setting = drive->settings;
+
+ while (setting) {
+ if (strcmp(setting->name, name) == 0)
+ break;
+ setting = setting->next;
+ }
+ return setting;
+}
+
+static void auto_remove_settings (ide_drive_t *drive)
+{
+ ide_settings_t *setting;
+repeat:
+ setting = drive->settings;
+ while (setting) {
+ if (setting->auto_remove) {
+ ide_remove_setting(drive, setting->name);
+ goto repeat;
+ }
+ setting = setting->next;
+ }
+}
+
+int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
+{
+ int val = -EINVAL;
+ unsigned long flags;
+
+ if ((setting->rw & SETTING_READ)) {
+ spin_lock_irqsave(&io_request_lock, flags);
+ switch(setting->data_type) {
+ case TYPE_BYTE:
+ val = *((u8 *) setting->data);
+ break;
+ case TYPE_SHORT:
+ val = *((u16 *) setting->data);
+ break;
+ case TYPE_INT:
+ case TYPE_INTA:
+ val = *((u32 *) setting->data);
+ break;
+ }
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ }
+ return val;
+}
+
+int ide_spin_wait_hwgroup (ide_drive_t *drive, unsigned long *flags)
+{
+ ide_hwgroup_t *hwgroup = HWGROUP(drive);
+ unsigned long timeout = jiffies + (3 * HZ);
+
+ spin_lock_irqsave(&io_request_lock, *flags);
+ while (hwgroup->busy) {
+ unsigned long lflags;
+ spin_unlock_irqrestore(&io_request_lock, *flags);
+ __save_flags(lflags); /* local CPU only */
+ __sti(); /* local CPU only; needed for jiffies */
+ if (0 < (signed long)(jiffies - timeout)) {
+ __restore_flags(lflags); /* local CPU only */
+ printk("%s: channel busy\n", drive->name);
+ return -EBUSY;
+ }
+ __restore_flags(lflags); /* local CPU only */
+ spin_lock_irqsave(&io_request_lock, *flags);
+ }
+ return 0;
+}
+
+/*
+ * FIXME: This should be changed to enqueue a special request
+ * to the driver to change settings, and then wait on a sema for completion.
+ * The current scheme of polling is kludgey, though safe enough.
+ */
+int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
+{
+ unsigned long flags;
+ int i;
+ u32 *p;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (!(setting->rw & SETTING_WRITE))
+ return -EPERM;
+ if (val < setting->min || val > setting->max)
+ return -EINVAL;
+ if (setting->set)
+ return setting->set(drive, val);
+ if (ide_spin_wait_hwgroup(drive, &flags))
+ return -EBUSY;
+ switch (setting->data_type) {
+ case TYPE_BYTE:
+ *((u8 *) setting->data) = val;
+ break;
+ case TYPE_SHORT:
+ *((u16 *) setting->data) = val;
+ break;
+ case TYPE_INT:
+ *((u32 *) setting->data) = val;
+ break;
+ case TYPE_INTA:
+ p = (u32 *) setting->data;
+ for (i = 0; i < 1 << PARTN_BITS; i++, p++)
+ *p = val;
+ break;
+ }
+ spin_unlock_irqrestore(&io_request_lock, flags);
+ return 0;
+}
+
+static int set_io_32bit(ide_drive_t *drive, int arg)
+{
+ drive->io_32bit = arg;
+#ifdef CONFIG_BLK_DEV_DTC2278
+ if (HWIF(drive)->chipset == ide_dtc2278)
+ HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
+#endif /* CONFIG_BLK_DEV_DTC2278 */
+ return 0;
+}
+
+static int set_using_dma (ide_drive_t *drive, int arg)
+{
+ if (!drive->driver || !DRIVER(drive)->supports_dma)
+ return -EPERM;
+ if (!drive->id || !(drive->id->capability & 1) || !HWIF(drive)->dmaproc)
+ return -EPERM;
+ if (HWIF(drive)->dmaproc(arg ? ide_dma_on : ide_dma_off, drive))
+ return -EIO;
+ return 0;
+}
+
+static int set_pio_mode (ide_drive_t *drive, int arg)
+{
+ struct request rq;
+
+ if (!HWIF(drive)->tuneproc)
+ return -ENOSYS;
+ if (drive->special.b.set_tune)
+ return -EBUSY;
+ ide_init_drive_cmd(&rq);
+ drive->tune_req = (byte) arg;
+ drive->special.b.set_tune = 1;
+ (void) ide_do_drive_cmd (drive, &rq, ide_wait);
+ return 0;
+}
+
+void ide_add_generic_settings (ide_drive_t *drive)
+{
+/*
+ * drive setting name read/write access read ioctl write ioctl data type min max mul_factor div_factor data pointer set function
+ */
+ ide_add_setting(drive, "io_32bit", drive->no_io_32bit ? SETTING_READ : SETTING_RW, HDIO_GET_32BIT, HDIO_SET_32BIT, TYPE_BYTE, 0, 1 + (SUPPORT_VLB_SYNC << 1), 1, 1, &drive->io_32bit, set_io_32bit);
+ ide_add_setting(drive, "keepsettings", SETTING_RW, HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, TYPE_BYTE, 0, 1, 1, 1, &drive->keep_settings, NULL);
+ ide_add_setting(drive, "nice1", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->nice1, NULL);
+ ide_add_setting(drive, "pio_mode", SETTING_WRITE, -1, HDIO_SET_PIO_MODE, TYPE_BYTE, 0, 255, 1, 1, NULL, set_pio_mode);
+ ide_add_setting(drive, "slow", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->slow, NULL);
+ ide_add_setting(drive, "unmaskirq", drive->no_unmask ? SETTING_READ : SETTING_RW, HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, TYPE_BYTE, 0, 1, 1, 1, &drive->unmask, NULL);
+ ide_add_setting(drive, "using_dma", SETTING_RW, HDIO_GET_DMA, HDIO_SET_DMA, TYPE_BYTE, 0, 1, 1, 1, &drive->using_dma, set_using_dma);
+ ide_add_setting(drive, "ide_scsi", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->scsi, NULL);
+}
+
+int ide_wait_cmd (ide_drive_t *drive, int cmd, int nsect, int feature, int sectors, byte *buf)
+{
+ struct request rq;
+ byte buffer[4];
+
+ if (!buf)
+ buf = buffer;
+ memset(buf, 0, 4 + SECTOR_WORDS * 4 * sectors);
+ ide_init_drive_cmd(&rq);
+ rq.buffer = buf;
+ *buf++ = cmd;
+ *buf++ = nsect;
+ *buf++ = feature;
+ *buf++ = sectors;
+ return ide_do_drive_cmd(drive, &rq, ide_wait);
+}
+
+/*
+ * Delay for *at least* 50ms. As we don't know how much time is left
+ * until the next tick occurs, we wait an extra tick to be safe.
+ * This is used only during the probing/polling for drives at boot time.
+ *
+ * However, its usefullness may be needed in other places, thus we export it now.
+ * The future may change this to a millisecond setable delay.
+ */
+void ide_delay_50ms (void)
+{
+ unsigned long timeout = jiffies + ((HZ + 19)/20) + 1;
+ while (0 < (signed long)(timeout - jiffies));
+}
+
+static int ide_ioctl (struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int err = 0, major, minor;
+ ide_drive_t *drive;
+ struct request rq;
+ kdev_t dev;
+ ide_settings_t *setting;
+
+ if (!inode || !(dev = inode->i_rdev))
+ return -EINVAL;
+ major = MAJOR(dev); minor = MINOR(dev);
+ if ((drive = get_info_ptr(inode->i_rdev)) == NULL)
+ return -ENODEV;
+
+ if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
+ if (cmd == setting->read_ioctl) {
+ err = ide_read_setting(drive, setting);
+ return err >= 0 ? put_user(err, (long *) arg) : err;
+ } else {
+ if ((MINOR(inode->i_rdev) & PARTN_MASK))
+ return -EINVAL;
+ return ide_write_setting(drive, setting, arg);
+ }
+ }
+
+ ide_init_drive_cmd (&rq);
+ switch (cmd) {
+ case HDIO_GETGEO:
+ {
+ struct hd_geometry *loc = (struct hd_geometry *) arg;
+ unsigned short bios_cyl = drive->bios_cyl; /* truncate */
+ if (!loc || (drive->media != ide_disk && drive->media != ide_floppy)) return -EINVAL;
+ if (put_user(drive->bios_head, (byte *) &loc->heads)) return -EFAULT;
+ if (put_user(drive->bios_sect, (byte *) &loc->sectors)) return -EFAULT;
+ if (put_user(bios_cyl, (unsigned short *) &loc->cylinders)) return -EFAULT;
+ if (put_user((unsigned)drive->part[MINOR(inode->i_rdev)&PARTN_MASK].start_sect,
+ (unsigned long *) &loc->start)) return -EFAULT;
+ return 0;
+ }
+
+ case BLKGETSIZE: /* Return device size */
+ return put_user(drive->part[MINOR(inode->i_rdev)&PARTN_MASK].nr_sects, (long *) arg);
+
+ case BLKRRPART: /* Re-read partition tables */
+ if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+ return ide_revalidate_disk(inode->i_rdev);
+
+ case HDIO_OBSOLETE_IDENTITY:
+ case HDIO_GET_IDENTITY:
+ if (MINOR(inode->i_rdev) & PARTN_MASK)
+ return -EINVAL;
+ if (drive->id == NULL)
+ return -ENOMSG;
+ if (copy_to_user((char *)arg, (char *)drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
+ return -EFAULT;
+ return 0;
+
+ case HDIO_GET_NICE:
+ return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP |
+ drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP |
+ drive->nice0 << IDE_NICE_0 |
+ drive->nice1 << IDE_NICE_1 |
+ drive->nice2 << IDE_NICE_2,
+ (long *) arg);
+ case HDIO_DRIVE_CMD:
+ {
+ byte args[4], *argbuf = args;
+ int argsize = 4;
+ if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+ if (NULL == (void *) arg)
+ return ide_do_drive_cmd(drive, &rq, ide_wait);
+ if (copy_from_user(args, (void *)arg, 4))
+ return -EFAULT;
+ if (args[3]) {
+ argsize = 4 + (SECTOR_WORDS * 4 * args[3]);
+ argbuf = kmalloc(argsize, GFP_KERNEL);
+ if (argbuf == NULL)
+ return -ENOMEM;
+ memcpy(argbuf, args, 4);
+ }
+ if (ide_ata66_check(drive, args[0], args[1], args[2]))
+ goto abort;
+
+ err = ide_wait_cmd(drive, args[0], args[1], args[2], args[3], argbuf);
+
+ if (!err && set_transfer(drive, args[0], args[1], args[2])) {
+#if 0
+ /* active-retuning-calls future */
+ if (HWIF(drive)->tune2proc)
+ HWIF(drive)->tune2proc(drive, args[1]);
+#endif
+ ide_driveid_update(drive);
+ }
+ abort:
+ if (copy_to_user((void *)arg, argbuf, argsize))
+ err = -EFAULT;
+ if (argsize > 4)
+ kfree(argbuf);
+ return err;
+ }
+
+ case HDIO_SCAN_HWIF:
+ {
+ int args[3];
+ if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+ if (copy_from_user(args, (void *)arg, 3 * sizeof(int)))
+ return -EFAULT;
+ if (ide_register(args[0], args[1], args[2]) == -1)
+ return -EIO;
+ return 0;
+ }
+ case HDIO_UNREGISTER_HWIF:
+ if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+ /* should I check here for arg > MAX_HWIFS, or
+ just let ide_unregister fail silently? -- shaver */
+ ide_unregister(arg);
+ return 0;
+ case HDIO_SET_NICE:
+ if (!capable(CAP_SYS_ADMIN)) return -EACCES;
+ if (drive->driver == NULL)
+ return -EPERM;
+ if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
+ return -EPERM;
+ drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
+ if (drive->dsc_overlap && !DRIVER(drive)->supports_dsc_overlap) {
+ drive->dsc_overlap = 0;
+ return -EPERM;
+ }
+ drive->nice1 = (arg >> IDE_NICE_1) & 1;
+ return 0;
+
+ case BLKROSET:
+ case BLKROGET:
+ case BLKFLSBUF:
+ case BLKSSZGET:
+ case BLKPG:
+ case BLKELVGET:
+ case BLKELVSET:
+ return blk_ioctl(inode->i_rdev, cmd, arg);
+
+ default:
+ if (drive->driver != NULL)
+ return DRIVER(drive)->ioctl(drive, inode, file, cmd, arg);
+ return -EPERM;
+ }
+}
+
+static int ide_check_media_change (kdev_t i_rdev)
+{
+ ide_drive_t *drive;
+
+ if ((drive = get_info_ptr(i_rdev)) == NULL)
+ return -ENODEV;
+ if (drive->driver != NULL)
+ return DRIVER(drive)->media_change(drive);
+ return 0;
+}
+
+void ide_fixstring (byte *s, const int bytecount, const int byteswap)
+{
+ byte *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
+
+ if (byteswap) {
+ /* convert from big-endian to host byte order */
+ for (p = end ; p != s;) {
+ unsigned short *pp = (unsigned short *) (p -= 2);
+ *pp = ntohs(*pp);
+ }
+ }
+
+ /* strip leading blanks */
+ while (s != end && *s == ' ')
+ ++s;
+
+ /* compress internal blanks and strip trailing blanks */
+ while (s != end && *s) {
+ if (*s++ != ' ' || (s != end && *s && *s != ' '))
+ *p++ = *(s-1);
+ }
+
+ /* wipe out trailing garbage */
+ while (p != end)
+ *p++ = '\0';
+}
+
+/*
+ * stridx() returns the offset of c within s,
+ * or -1 if c is '\0' or not found within s.
+ */
+static int __init stridx (const char *s, char c)
+{
+ char *i = strchr(s, c);
+ return (i && c) ? i - s : -1;
+}
+
+/*
+ * match_parm() does parsing for ide_setup():
+ *
+ * 1. the first char of s must be '='.
+ * 2. if the remainder matches one of the supplied keywords,
+ * the index (1 based) of the keyword is negated and returned.
+ * 3. if the remainder is a series of no more than max_vals numbers
+ * separated by commas, the numbers are saved in vals[] and a
+ * count of how many were saved is returned. Base10 is assumed,
+ * and base16 is allowed when prefixed with "0x".
+ * 4. otherwise, zero is returned.
+ */
+static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
+{
+ static const char *decimal = "0123456789";
+ static const char *hex = "0123456789abcdef";
+ int i, n;
+
+ if (*s++ == '=') {
+ /*
+ * Try matching against the supplied keywords,
+ * and return -(index+1) if we match one
+ */
+ if (keywords != NULL) {
+ for (i = 0; *keywords != NULL; ++i) {
+ if (!strcmp(s, *keywords++))
+ return -(i+1);
+ }
+ }
+ /*
+ * Look for a series of no more than "max_vals"
+ * numeric values separated by commas, in base10,
+ * or base16 when prefixed with "0x".
+ * Return a count of how many were found.
+ */
+ for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
+ vals[n] = i;
+ while ((i = stridx(decimal, *++s)) >= 0)
+ vals[n] = (vals[n] * 10) + i;
+ if (*s == 'x' && !vals[n]) {
+ while ((i = stridx(hex, *++s)) >= 0)
+ vals[n] = (vals[n] * 0x10) + i;
+ }
+ if (++n == max_vals)
+ break;
+ if (*s == ',' || *s == ';')
+ ++s;
+ }
+ if (!*s)
+ return n;
+ }
+ return 0; /* zero = nothing matched */
+}
+
+/*
+ * ide_setup() gets called VERY EARLY during initialization,
+ * to handle kernel "command line" strings beginning with "hdx="
+ * or "ide". Here is the complete set currently supported:
+ *
+ * "hdx=" is recognized for all "x" from "a" to "h", such as "hdc".
+ * "idex=" is recognized for all "x" from "0" to "3", such as "ide1".
+ *
+ * "hdx=noprobe" : drive may be present, but do not probe for it
+ * "hdx=none" : drive is NOT present, ignore cmos and do not probe
+ * "hdx=nowerr" : ignore the WRERR_STAT bit on this drive
+ * "hdx=cdrom" : drive is present, and is a cdrom drive
+ * "hdx=cyl,head,sect" : disk drive is present, with specified geometry
+ * "hdx=noremap" : do not remap 0->1 even though EZD was detected
+ * "hdx=autotune" : driver will attempt to tune interface speed
+ * to the fastest PIO mode supported,
+ * if possible for this drive only.
+ * Not fully supported by all chipset types,
+ * and quite likely to cause trouble with
+ * older/odd IDE drives.
+ *
+ * "hdx=slow" : insert a huge pause after each access to the data
+ * port. Should be used only as a last resort.
+ *
+ * "hdx=swapdata" : when the drive is a disk, byte swap all data
+ * "hdx=bswap" : same as above..........
+ * "hdxlun=xx" : set the drive last logical unit.
+ * "hdx=flash" : allows for more than one ata_flash disk to be
+ * registered. In most cases, only one device
+ * will be present.
+ * "hdx=scsi" : the return of the ide-scsi flag, this is useful for
+ * allowwing ide-floppy, ide-tape, and ide-cdrom|writers
+ * to use ide-scsi emulation on a device specific option.
+ * "idebus=xx" : inform IDE driver of VESA/PCI bus speed in MHz,
+ * where "xx" is between 20 and 66 inclusive,
+ * used when tuning chipset PIO modes.
+ * For PCI bus, 25 is correct for a P75 system,
+ * 30 is correct for P90,P120,P180 systems,
+ * and 33 is used for P100,P133,P166 systems.
+ * If in doubt, use idebus=33 for PCI.
+ * As for VLB, it is safest to not specify it.
+ *
+ * "idex=noprobe" : do not attempt to access/use this interface
+ * "idex=base" : probe for an interface at the addr specified,
+ * where "base" is usually 0x1f0 or 0x170
+ * and "ctl" is assumed to be "base"+0x206
+ * "idex=base,ctl" : specify both base and ctl
+ * "idex=base,ctl,irq" : specify base, ctl, and irq number
+ * "idex=autotune" : driver will attempt to tune interface speed
+ * to the fastest PIO mode supported,
+ * for all drives on this interface.
+ * Not fully supported by all chipset types,
+ * and quite likely to cause trouble with
+ * older/odd IDE drives.
+ * "idex=noautotune" : driver will NOT attempt to tune interface speed
+ * This is the default for most chipsets,
+ * except the cmd640.
+ * "idex=serialize" : do not overlap operations on idex and ide(x^1)
+ * "idex=four" : four drives on idex and ide(x^1) share same ports
+ * "idex=reset" : reset interface before first use
+ * "idex=dma" : enable DMA by default on both drives if possible
+ * "idex=ata66" : informs the interface that it has an 80c cable
+ * for chipsets that are ATA-66 capable, but
+ * the ablity to bit test for detection is
+ * currently unknown.
+ * "ide=reverse" : Formerly called to pci sub-system, but now local.
+ *
+ * "splitfifo=betweenChan"
+ * : FIFO Configuration of VIA 82c586(<nothing>,"A"or"B").
+ * --see what follows...
+ * "splitfifo=betweenChan,thresholdprim,thresholdsec"
+ * : FIFO Configuration of VIA 82c586(<nothing>,"A" or "B").
+ * betweenChan = 1(all FIFO's to primary channel)
+ * , 2(all FIFO's to secondary channel)
+ * , 3 or 4(evenly shared between them).
+ * note: without FIFO, a channel is (u)dma disabled!
+ * thresholdprim = 4, 3, 2 or 1
+ * (standing for 1, 3/4, 1/2, 1/4).
+ * Sets the threshold of FIFO to begin dma
+ * transfer on the primary channel.
+ * thresholdsec = cf upper, but for secondary channel.
+ *
+ * The following are valid ONLY on ide0, (except dc4030)
+ * and the defaults for the base,ctl ports must not be altered.
+ *
+ * "ide0=dtc2278" : probe/support DTC2278 interface
+ * "ide0=ht6560b" : probe/support HT6560B interface
+ * "ide0=cmd640_vlb" : *REQUIRED* for VLB cards with the CMD640 chip
+ * (not for PCI -- automatically detected)
+ * "ide0=qd6580" : probe/support qd6580 interface
+ * "ide0=ali14xx" : probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
+ * "ide0=umc8672" : probe/support umc8672 chipsets
+ * "idex=dc4030" : probe/support Promise DC4030VL interface
+ * "ide=doubler" : probe/support IDE doublers on Amiga
+ */
+int __init ide_setup (char *s)
+{
+ int i, vals[3];
+ ide_hwif_t *hwif;
+ ide_drive_t *drive;
+ unsigned int hw, unit;
+ const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
+ const char max_hwif = '0' + (MAX_HWIFS - 1);
+
+ printk("ide_setup: %s", s);
+ init_ide_data ();
+
+#ifdef CONFIG_BLK_DEV_IDEDOUBLER
+ if (!strcmp(s, "ide=doubler")) {
+ extern int ide_doubler;
+
+ printk(" : Enabled support for IDE doublers\n");
+ ide_doubler = 1;
+ return 0;
+ }
+#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ if (!strcmp(s, "ide=reverse")) {
+ ide_scan_direction = 1;
+ printk(" : Enabled support for IDE inverse scan order.\n");
+ return 0;
+ }
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+
+ /*
+ * Look for drive options: "hdx="
+ */
+ if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
+ const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
+ "serialize", "autotune", "noautotune",
+ "slow", "swapdata", "bswap", "flash",
+ "remap", "noremap", "scsi", NULL};
+ unit = s[2] - 'a';
+ hw = unit / MAX_DRIVES;
+ unit = unit % MAX_DRIVES;
+ hwif = &ide_hwifs[hw];
+ drive = &hwif->drives[unit];
+ if (strncmp(s + 4, "ide-", 4) == 0) {
+ strncpy(drive->driver_req, s + 4, 9);
+ goto done;
+ }
+ /*
+ * Look for last lun option: "hdxlun="
+ */
+ if (s[3] == 'l' && s[4] == 'u' && s[5] == 'n') {
+ if (match_parm(&s[6], NULL, vals, 1) != 1)
+ goto bad_option;
+ if (vals[0] >= 0 && vals[0] <= 7) {
+ drive->last_lun = vals[0];
+ drive->forced_lun = 1;
+ } else
+ printk(" -- BAD LAST LUN! Expected value from 0 to 7");
+ goto done;
+ }
+ switch (match_parm(&s[3], hd_words, vals, 3)) {
+ case -1: /* "none" */
+ drive->nobios = 1; /* drop into "noprobe" */
+ case -2: /* "noprobe" */
+ drive->noprobe = 1;
+ goto done;
+ case -3: /* "nowerr" */
+ drive->bad_wstat = BAD_R_STAT;
+ hwif->noprobe = 0;
+ goto done;
+ case -4: /* "cdrom" */
+ drive->present = 1;
+ drive->media = ide_cdrom;
+ hwif->noprobe = 0;
+ goto done;
+ case -5: /* "serialize" */
+ printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
+ goto do_serialize;
+ case -6: /* "autotune" */
+ drive->autotune = 1;
+ goto done;
+ case -7: /* "noautotune" */
+ drive->autotune = 2;
+ goto done;
+ case -8: /* "slow" */
+ drive->slow = 1;
+ goto done;
+ case -9: /* "swapdata" or "bswap" */
+ case -10:
+ drive->bswap = 1;
+ goto done;
+ case -11: /* "flash" */
+ drive->ata_flash = 1;
+ goto done;
+ case -12: /* "remap" */
+ drive->remap_0_to_1 = 1;
+ goto done;
+ case -13: /* "noremap" */
+ drive->remap_0_to_1 = 2;
+ goto done;
+ case -14: /* "scsi" */
+#if defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI)
+ drive->scsi = 1;
+ goto done;
+#else
+ drive->scsi = 0;
+ goto bad_option;
+#endif /* defined(CONFIG_BLK_DEV_IDESCSI) && defined(CONFIG_SCSI) */
+ case 3: /* cyl,head,sect */
+ drive->media = ide_disk;
+ drive->cyl = drive->bios_cyl = vals[0];
+ drive->head = drive->bios_head = vals[1];
+ drive->sect = drive->bios_sect = vals[2];
+ drive->present = 1;
+ drive->forced_geom = 1;
+ hwif->noprobe = 0;
+ goto done;
+ default:
+ goto bad_option;
+ }
+ }
+
+#if defined(CONFIG_BLK_DEV_VIA82CXXX)
+ /*
+ * Look for drive option "splitfifo=..."
+ */
+
+ if (s[0] == 's' && s[1] == 'p' && s[2] == 'l' &&
+ s[3] == 'i' && s[4] == 't' && s[5] == 'f' &&
+ s[6] == 'i' && s[7] == 'f' && s[8] == 'o') {
+ byte tmp = 0x3a; /* default config byte */
+
+ i = match_parm(&s[9], NULL, vals, 3);
+ switch(i) {
+ case 3:
+ tmp &= 0xf0;
+ if ((vals[1] > 0) && (vals[1] < 5)) {
+ /* sets threshold for primary Channel: */
+ byte x = 4 - vals[1];
+ tmp |= (x << 2);
+ }
+ else
+ goto bad_option;
+ if ((vals[2] > 0) && (vals[2] < 5)) {
+ /* sets threshold for secondary Channel: */
+ byte x = 4 - vals[2];
+ tmp |= x;
+ }
+ else
+ goto bad_option;
+ case 1:
+ /* set the FIFO config between channels to 0: */
+ tmp &= 0x9f;
+ /* set the needed FIFO config between channels: */
+ if (vals[0] == 1) /* primary fifo only */
+ tmp |= 0x10;
+ else if (vals[0] == 2) /* secondary fifo only */
+ tmp |= 0x70;
+ else if (vals[0] == 4) /* other shared fifo config */
+ tmp |= 0x50;
+ else if (vals[0] == 3) /* default config */
+ tmp |= 0x30;
+ else
+ goto bad_option;
+ break;
+ default:
+ goto bad_option;
+ }
+ /* set the found option in fifoconfig */
+ fifoconfig = tmp;
+ goto done;
+ }
+#endif /* defined(CONFIG_BLK_DEV_VIA82CXXX) */
+
+ if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
+ goto bad_option;
+ /*
+ * Look for bus speed option: "idebus="
+ */
+ if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
+ if (match_parm(&s[6], NULL, vals, 1) != 1)
+ goto bad_option;
+ if (vals[0] >= 20 && vals[0] <= 66) {
+ idebus_parameter = vals[0];
+ } else
+ printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
+ goto done;
+ }
+ /*
+ * Look for interface options: "idex="
+ */
+ if (s[3] >= '0' && s[3] <= max_hwif) {
+ /*
+ * Be VERY CAREFUL changing this: note hardcoded indexes below
+ * -8,-9,-10 : are reserved for future idex calls to ease the hardcoding.
+ */
+ const char *ide_words[] = {
+ "noprobe", "serialize", "autotune", "noautotune", "reset", "dma", "ata66",
+ "minus8", "minus9", "minus10",
+ "four", "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 <= -11) { /* is parameter a chipset name? */
+ if (hwif->chipset != ide_unknown)
+ goto bad_option; /* chipset already specified */
+ if (i <= -11 && i != -18 && hw != 0)
+ goto bad_hwif; /* chipset drivers are for "ide0=" only */
+ if (i <= -11 && i != -18 && ide_hwifs[hw+1].chipset != ide_unknown)
+ goto bad_option; /* chipset for 2nd port already specified */
+ printk("\n");
+ }
+
+ switch (i) {
+#ifdef CONFIG_BLK_DEV_PDC4030
+ case -18: /* "dc4030" */
+ {
+ extern void init_pdc4030(void);
+ init_pdc4030();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_PDC4030 */
+#ifdef CONFIG_BLK_DEV_ALI14XX
+ case -17: /* "ali14xx" */
+ {
+ extern void init_ali14xx (void);
+ init_ali14xx();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_ALI14XX */
+#ifdef CONFIG_BLK_DEV_UMC8672
+ case -16: /* "umc8672" */
+ {
+ extern void init_umc8672 (void);
+ init_umc8672();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_UMC8672 */
+#ifdef CONFIG_BLK_DEV_DTC2278
+ case -15: /* "dtc2278" */
+ {
+ extern void init_dtc2278 (void);
+ init_dtc2278();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_DTC2278 */
+#ifdef CONFIG_BLK_DEV_CMD640
+ case -14: /* "cmd640_vlb" */
+ {
+ extern int cmd640_vlb; /* flag for cmd640.c */
+ cmd640_vlb = 1;
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_CMD640 */
+#ifdef CONFIG_BLK_DEV_HT6560B
+ case -13: /* "ht6560b" */
+ {
+ extern void init_ht6560b (void);
+ init_ht6560b();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_HT6560B */
+#if CONFIG_BLK_DEV_QD6580
+ case -12: /* "qd6580" */
+ {
+ extern void init_qd6580 (void);
+ init_qd6580();
+ goto done;
+ }
+#endif /* CONFIG_BLK_DEV_QD6580 */
+#ifdef CONFIG_BLK_DEV_4DRIVES
+ case -11: /* "four" drives on one set of ports */
+ {
+ ide_hwif_t *mate = &ide_hwifs[hw^1];
+ mate->drives[0].select.all ^= 0x20;
+ mate->drives[1].select.all ^= 0x20;
+ hwif->chipset = mate->chipset = ide_4drives;
+ mate->irq = hwif->irq;
+ memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
+ goto do_serialize;
+ }
+#endif /* CONFIG_BLK_DEV_4DRIVES */
+ case -10: /* minus10 */
+ case -9: /* minus9 */
+ case -8: /* minus8 */
+ goto bad_option;
+ case -7: /* ata66 */
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ hwif->udma_four = 1;
+ goto done;
+#else /* !CONFIG_BLK_DEV_IDEPCI */
+ hwif->udma_four = 0;
+ goto bad_hwif;
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ case -6: /* dma */
+ hwif->autodma = 1;
+ goto done;
+ case -5: /* "reset" */
+ hwif->reset = 1;
+ goto done;
+ case -4: /* "noautotune" */
+ hwif->drives[0].autotune = 2;
+ hwif->drives[1].autotune = 2;
+ goto done;
+ case -3: /* "autotune" */
+ hwif->drives[0].autotune = 1;
+ hwif->drives[1].autotune = 1;
+ goto done;
+ case -2: /* "serialize" */
+ do_serialize:
+ hwif->mate = &ide_hwifs[hw^1];
+ hwif->mate->mate = hwif;
+ hwif->serialized = hwif->mate->serialized = 1;
+ goto done;
+
+ case -1: /* "noprobe" */
+ hwif->noprobe = 1;
+ goto done;
+
+ case 1: /* base */
+ vals[1] = vals[0] + 0x206; /* default ctl */
+ case 2: /* base,ctl */
+ vals[2] = 0; /* default irq = probe for it */
+ case 3: /* base,ctl,irq */
+ hwif->hw.irq = vals[2];
+ ide_init_hwif_ports(&hwif->hw, (ide_ioreg_t) vals[0], (ide_ioreg_t) vals[1], &hwif->irq);
+ memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
+ hwif->irq = vals[2];
+ hwif->noprobe = 0;
+ hwif->chipset = ide_generic;
+ goto done;
+
+ case 0: goto bad_option;
+ default:
+ printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
+ return 0;
+ }
+ }
+bad_option:
+ printk(" -- BAD OPTION\n");
+ return 0;
+bad_hwif:
+ printk("-- NOT SUPPORTED ON ide%d", hw);
+done:
+ printk("\n");
+ return 0;
+}
+
+/*
+ * probe_for_hwifs() finds/initializes "known" IDE interfaces
+ */
+static void __init probe_for_hwifs (void)
+{
+#ifdef CONFIG_PCI
+ if (pci_present())
+ {
+#ifdef CONFIG_BLK_DEV_IDEPCI
+ ide_scan_pcibus(ide_scan_direction);
+#else
+#ifdef CONFIG_BLK_DEV_RZ1000
+ {
+ extern void ide_probe_for_rz100x(void);
+ ide_probe_for_rz100x();
+ }
+#endif /* CONFIG_BLK_DEV_RZ1000 */
+#endif /* CONFIG_BLK_DEV_IDEPCI */
+ }
+#endif /* CONFIG_PCI */
+
+#ifdef CONFIG_BLK_DEV_CMD640
+ {
+ extern void ide_probe_for_cmd640x(void);
+ ide_probe_for_cmd640x();
+ }
+#endif /* CONFIG_BLK_DEV_CMD640 */
+#ifdef CONFIG_BLK_DEV_PDC4030
+ {
+ extern int ide_probe_for_pdc4030(void);
+ (void) ide_probe_for_pdc4030();
+ }
+#endif /* CONFIG_BLK_DEV_PDC4030 */
+#ifdef CONFIG_BLK_DEV_IDE_PMAC
+ {
+ extern void pmac_ide_probe(void);
+ pmac_ide_probe();
+ }
+#endif /* CONFIG_BLK_DEV_IDE_PMAC */
+#ifdef CONFIG_BLK_DEV_IDE_ICSIDE
+ {
+ extern void icside_init(void);
+ icside_init();
+ }
+#endif /* CONFIG_BLK_DEV_IDE_ICSIDE */
+#ifdef CONFIG_BLK_DEV_IDE_RAPIDE
+ {
+ extern void rapide_init(void);
+ rapide_init();
+ }
+#endif /* CONFIG_BLK_DEV_IDE_RAPIDE */
+#ifdef CONFIG_BLK_DEV_GAYLE
+ {
+ extern void gayle_init(void);
+ gayle_init();
+ }
+#endif /* CONFIG_BLK_DEV_GAYLE */
+#ifdef CONFIG_BLK_DEV_FALCON_IDE
+ {
+ extern void falconide_init(void);
+ falconide_init();
+ }
+#endif /* CONFIG_BLK_DEV_FALCON_IDE */
+#ifdef CONFIG_BLK_DEV_MAC_IDE
+ {
+ extern void macide_init(void);
+ macide_init();
+ }
+#endif /* CONFIG_BLK_DEV_MAC_IDE */
+#ifdef CONFIG_BLK_DEV_BUDDHA
+ {
+ extern void buddha_init(void);
+ buddha_init();
+ }
+#endif /* CONFIG_BLK_DEV_BUDDHA */
+#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP)
+ {
+ extern void pnpide_init(int enable);
+ pnpide_init(1);
+ }
+#endif /* CONFIG_BLK_DEV_ISAPNP */
+}
+
+void __init ide_init_builtin_drivers (void)
+{
+ /*
+ * Probe for special PCI and other "known" interface chipsets
+ */
+ probe_for_hwifs ();
+
+#ifdef CONFIG_BLK_DEV_IDE
+#if defined(__mc68000__) || defined(CONFIG_APUS)
+ if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET]) {
+ ide_get_lock(&ide_lock, NULL, NULL); /* for atari only */
+ disable_irq(ide_hwifs[0].irq); /* disable_irq_nosync ?? */
+ }
+#endif /* __mc68000__ || CONFIG_APUS */
+
+ (void) ideprobe_init();
+
+#if defined(__mc68000__) || defined(CONFIG_APUS)
+ if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET]) {
+ enable_irq(ide_hwifs[0].irq);
+ ide_release_lock(&ide_lock); /* for atari only */
+ }
+#endif /* __mc68000__ || CONFIG_APUS */
+#endif /* CONFIG_BLK_DEV_IDE */
+
+#ifdef CONFIG_PROC_FS
+ proc_ide_create();
+#endif
+
+ /*
+ * Attempt to match drivers for the available drives
+ */
+#ifdef CONFIG_BLK_DEV_IDEDISK
+ (void) idedisk_init();
+#endif /* CONFIG_BLK_DEV_IDEDISK */
+#ifdef CONFIG_BLK_DEV_IDECD
+ (void) ide_cdrom_init();
+#endif /* CONFIG_BLK_DEV_IDECD */
+#ifdef CONFIG_BLK_DEV_IDETAPE
+ (void) idetape_init();
+#endif /* CONFIG_BLK_DEV_IDETAPE */
+#ifdef CONFIG_BLK_DEV_IDEFLOPPY
+ (void) idefloppy_init();
+#endif /* CONFIG_BLK_DEV_IDEFLOPPY */
+#ifdef CONFIG_BLK_DEV_IDESCSI
+ #ifdef CONFIG_SCSI
+ (void) idescsi_init();
+ #else
+ #warning ide scsi-emulation selected but no SCSI-subsystem in kernel
+ #endif
+#endif /* CONFIG_BLK_DEV_IDESCSI */
+}
+
+static int default_cleanup (ide_drive_t *drive)
+{
+ return ide_unregister_subdriver(drive);
+}
+
+static ide_startstop_t default_do_request(ide_drive_t *drive, struct request *rq, unsigned long block)
+{
+ ide_end_request(0, HWGROUP(drive));
+ return ide_stopped;
+}
+
+static void default_end_request (byte uptodate, ide_hwgroup_t *hwgroup)
+{
+ ide_end_request(uptodate, hwgroup);
+}
+
+static int default_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return -EIO;
+}
+
+static int default_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+ drive->usage--;
+ return -EIO;
+}
+
+static void default_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
+{
+}
+
+static int default_check_media_change (ide_drive_t *drive)
+{
+ return 1;
+}
+
+static void default_pre_reset (ide_drive_t *drive)
+{
+}
+
+static unsigned long default_capacity (ide_drive_t *drive)
+{
+ return 0x7fffffff; /* cdrom or tape */
+}
+
+static ide_startstop_t default_special (ide_drive_t *drive)
+{
+ special_t *s = &drive->special;
+
+ s->all = 0;
+ drive->mult_req = 0;
+ return ide_stopped;
+}
+
+static void setup_driver_defaults (ide_drive_t *drive)
+{
+ ide_driver_t *d = drive->driver;
+
+ if (d->cleanup == NULL) d->cleanup = default_cleanup;
+ if (d->do_request == NULL) d->do_request = default_do_request;
+ if (d->end_request == NULL) d->end_request = default_end_request;
+ if (d->ioctl == NULL) d->ioctl = default_ioctl;
+ if (d->open == NULL) d->open = default_open;
+ if (d->release == NULL) d->release = default_release;
+ if (d->media_change == NULL) d->media_change = default_check_media_change;
+ if (d->pre_reset == NULL) d->pre_reset = default_pre_reset;
+ if (d->capacity == NULL) d->capacity = default_capacity;
+ if (d->special == NULL) d->special = default_special;
+}
+
+ide_drive_t *ide_scan_devices (byte media, const char *name, ide_driver_t *driver, int n)
+{
+ unsigned int unit, index, i;
+
+ for (index = 0, i = 0; index < MAX_HWIFS; ++index) {
+ ide_hwif_t *hwif = &ide_hwifs[index];
+ if (!hwif->present)
+ continue;
+ for (unit = 0; unit < MAX_DRIVES; ++unit) {
+ ide_drive_t *drive = &hwif->drives[unit];
+ char *req = drive->driver_req;
+ if (*req && !strstr(name, req))
+ continue;
+ if (drive->present && drive->media == media && drive->driver == driver && ++i > n)
+ return drive;
+ }
+ }
+ return NULL;
+}
+
+int ide_register_subdriver (ide_drive_t *drive, ide_driver_t *driver, int version)
+{
+ unsigned long flags;
+
+ save_flags(flags); /* all CPUs */
+ cli(); /* all CPUs */
+ if (version != IDE_SUBDRIVER_VERSION || !drive->present || drive->driver != NULL || drive->busy || drive->usage) {
+ restore_flags(flags); /* all CPUs */
+ return 1;
+ }
+ drive->driver = driver;
+ setup_driver_defaults(drive);
+ restore_flags(flags); /* all CPUs */
+ if (drive->autotune != 2) {
+ if (driver->supports_dma && HWIF(drive)->dmaproc != NULL) {
+ /*
+ * Force DMAing for the beginning of the check.
+ * Some chipsets appear to do interesting things,
+ * if not checked and cleared.
+ * PARANOIA!!!
+ */
+ (void) (HWIF(drive)->dmaproc(ide_dma_off_quietly, drive));
+ (void) (HWIF(drive)->dmaproc(ide_dma_check, drive));
+ }
+ drive->dsc_overlap = (drive->next != drive && driver->supports_dsc_overlap);
+ drive->nice1 = 1;
+ }
+ drive->revalidate = 1;
+#ifdef CONFIG_PROC_FS
+ ide_add_proc_entries(drive->proc, generic_subdriver_entries, drive);
+ ide_add_proc_entries(drive->proc, driver->proc, drive);
+#endif
+ return 0;
+}
+
+int ide_unregister_subdriver (ide_drive_t *drive)
+{
+ unsigned long flags;
+
+ save_flags(flags); /* all CPUs */
+ cli(); /* all CPUs */
+ if (drive->usage || drive->busy || drive->driver == NULL || DRIVER(drive)->busy) {
+ restore_flags(flags); /* all CPUs */
+ return 1;
+ }
+#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP) && defined(MODULE)
+ pnpide_init(0);
+#endif /* CONFIG_BLK_DEV_ISAPNP */
+#ifdef CONFIG_PROC_FS
+ ide_remove_proc_entries(drive->proc, DRIVER(drive)->proc);
+ ide_remove_proc_entries(drive->proc, generic_subdriver_entries);
+#endif
+ auto_remove_settings(drive);
+ drive->driver = NULL;
+ restore_flags(flags); /* all CPUs */
+ return 0;
+}
+
+int ide_register_module (ide_module_t *module)
+{
+ ide_module_t *p = ide_modules;
+
+ while (p) {
+ if (p == module)
+ return 1;
+ p = p->next;
+ }
+ module->next = ide_modules;
+ ide_modules = module;
+ revalidate_drives();
+ return 0;
+}
+
+void ide_unregister_module (ide_module_t *module)
+{
+ ide_module_t **p;
+
+ for (p = &ide_modules; (*p) && (*p) != module; p = &((*p)->next));
+ if (*p)
+ *p = (*p)->next;
+}
+
+struct block_device_operations ide_fops[] = {{
+ open: ide_open,
+ release: ide_release,
+ ioctl: ide_ioctl,
+ check_media_change: ide_check_media_change,
+ revalidate: ide_revalidate_disk
+}};
+
+EXPORT_SYMBOL(ide_hwifs);
+EXPORT_SYMBOL(ide_register_module);
+EXPORT_SYMBOL(ide_unregister_module);
+EXPORT_SYMBOL(ide_spin_wait_hwgroup);
+
+/*
+ * Probe module
+ */
+devfs_handle_t ide_devfs_handle = NULL;
+
+EXPORT_SYMBOL(ide_probe);
+EXPORT_SYMBOL(drive_is_flashcard);
+EXPORT_SYMBOL(ide_timer_expiry);
+EXPORT_SYMBOL(ide_intr);
+EXPORT_SYMBOL(ide_fops);
+EXPORT_SYMBOL(ide_get_queue);
+EXPORT_SYMBOL(do_ide0_request);
+EXPORT_SYMBOL(ide_add_generic_settings);
+EXPORT_SYMBOL(ide_devfs_handle);
+#if MAX_HWIFS > 1
+EXPORT_SYMBOL(do_ide1_request);
+#endif /* MAX_HWIFS > 1 */
+#if MAX_HWIFS > 2
+EXPORT_SYMBOL(do_ide2_request);
+#endif /* MAX_HWIFS > 2 */
+#if MAX_HWIFS > 3
+EXPORT_SYMBOL(do_ide3_request);
+#endif /* MAX_HWIFS > 3 */
+#if MAX_HWIFS > 4
+EXPORT_SYMBOL(do_ide4_request);
+#endif /* MAX_HWIFS > 4 */
+#if MAX_HWIFS > 5
+EXPORT_SYMBOL(do_ide5_request);
+#endif /* MAX_HWIFS > 5 */
+#if MAX_HWIFS > 6
+EXPORT_SYMBOL(do_ide6_request);
+#endif /* MAX_HWIFS > 6 */
+#if MAX_HWIFS > 7
+EXPORT_SYMBOL(do_ide7_request);
+#endif /* MAX_HWIFS > 7 */
+#if MAX_HWIFS > 8
+EXPORT_SYMBOL(do_ide8_request);
+#endif /* MAX_HWIFS > 8 */
+#if MAX_HWIFS > 9
+EXPORT_SYMBOL(do_ide9_request);
+#endif /* MAX_HWIFS > 9 */
+
+/*
+ * Driver module
+ */
+EXPORT_SYMBOL(ide_scan_devices);
+EXPORT_SYMBOL(ide_register_subdriver);
+EXPORT_SYMBOL(ide_unregister_subdriver);
+EXPORT_SYMBOL(ide_replace_subdriver);
+EXPORT_SYMBOL(ide_input_data);
+EXPORT_SYMBOL(ide_output_data);
+EXPORT_SYMBOL(atapi_input_bytes);
+EXPORT_SYMBOL(atapi_output_bytes);
+EXPORT_SYMBOL(ide_set_handler);
+EXPORT_SYMBOL(ide_dump_status);
+EXPORT_SYMBOL(ide_error);
+EXPORT_SYMBOL(ide_fixstring);
+EXPORT_SYMBOL(ide_wait_stat);
+EXPORT_SYMBOL(ide_do_reset);
+EXPORT_SYMBOL(ide_init_drive_cmd);
+EXPORT_SYMBOL(ide_do_drive_cmd);
+EXPORT_SYMBOL(ide_end_drive_cmd);
+EXPORT_SYMBOL(ide_end_request);
+EXPORT_SYMBOL(ide_revalidate_disk);
+EXPORT_SYMBOL(ide_cmd);
+EXPORT_SYMBOL(ide_wait_cmd);
+EXPORT_SYMBOL(ide_delay_50ms);
+EXPORT_SYMBOL(ide_stall_queue);
+#ifdef CONFIG_PROC_FS
+EXPORT_SYMBOL(ide_add_proc_entries);
+EXPORT_SYMBOL(ide_remove_proc_entries);
+EXPORT_SYMBOL(proc_ide_read_geometry);
+EXPORT_SYMBOL(create_proc_ide_interfaces);
+#endif
+EXPORT_SYMBOL(ide_add_setting);
+EXPORT_SYMBOL(ide_remove_setting);
+
+EXPORT_SYMBOL(ide_register_hw);
+EXPORT_SYMBOL(ide_register);
+EXPORT_SYMBOL(ide_unregister);
+EXPORT_SYMBOL(ide_setup_ports);
+EXPORT_SYMBOL(hwif_unregister);
+EXPORT_SYMBOL(get_info_ptr);
+EXPORT_SYMBOL(current_capacity);
+
+/*
+ * This is gets invoked once during initialization, to set *everything* up
+ */
+int __init ide_init (void)
+{
+ static char banner_printed = 0;
+ int i;
+
+ if (!banner_printed) {
+ printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
+ ide_devfs_handle = devfs_mk_dir (NULL, "ide", 3, NULL);
+ (void) ide_system_bus_speed();
+ banner_printed = 1;
+ }
+
+ init_ide_data ();
+
+ initializing = 1;
+ ide_init_builtin_drivers();
+ initializing = 0;
+
+ for (i = 0; i < MAX_HWIFS; ++i) {
+ ide_hwif_t *hwif = &ide_hwifs[i];
+ if (hwif->present)
+ ide_geninit(hwif);
+ }
+
+ return 0;
+}
+
+static void __init parse_options (char *line)
+{
+ char *next = line;
+
+ if (line == NULL || !*line)
+ return;
+ while ((line = next) != NULL) {
+ if ((next = strchr(line,' ')) != NULL)
+ *next++ = 0;
+ if (!strncmp(line,"ide",3) ||
+ !strncmp(line,"idebus",6) ||
+#ifdef CONFIG_BLK_DEV_VIA82CXXX
+ !strncmp(line,"splitfifo",9) ||
+#endif /* CONFIG_BLK_DEV_VIA82CXXX */
+ !strncmp(line,"hdxlun",6) ||
+ (!strncmp(line,"hd",2) && line[2] != '='))
+ (void) ide_setup(line);
+ }
+}
+
+#ifdef MODULE
+char *options = NULL;
+MODULE_PARM(options,"s");
+
+int init_module (void)
+{
+ parse_options(options);
+ return ide_init();
+}
+
+void cleanup_module (void)
+{
+ int index;
+
+ for (index = 0; index < MAX_HWIFS; ++index)
+ ide_unregister(index);
+
+#ifdef CONFIG_PROC_FS
+ proc_ide_destroy();
+#endif
+ devfs_unregister (ide_devfs_handle);
+}
+
+#else /* !MODULE */
+
+static int parse_ide_setup (char *line)
+{
+ parse_options(line);
+ return 0;
+}
+__setup("", parse_ide_setup);
+
+#endif /* MODULE */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)