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android-kvm / linux / f5e3c2faa20615e900ab26bd957f898400435924 / . / drivers / ide / ide-probe.c
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/*
* linux/drivers/ide/ide-probe.c Version 1.11 Mar 05, 2003
*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
*/
/*
* Mostly written by Mark Lord <mlord@pobox.com>
* and Gadi Oxman <gadio@netvision.net.il>
* and Andre Hedrick <andre@linux-ide.org>
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This is the IDE probe module, as evolved from hd.c and ide.c.
*
* Version 1.00 move drive probing code from ide.c to ide-probe.c
* Version 1.01 fix compilation problem for m68k
* Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
* by Andrea Arcangeli
* Version 1.03 fix for (hwif->chipset == ide_4drives)
* Version 1.04 fixed buggy treatments of known flash memory cards
*
* Version 1.05 fix for (hwif->chipset == ide_pdc4030)
* added ide6/7/8/9
* allowed for secondary flash card to be detectable
* with new flag : drive->ata_flash : 1;
* Version 1.06 stream line request queue and prep for cascade project.
* Version 1.07 max_sect <= 255; slower disks would get behind and
* then fall over when they get to 256. Paul G.
* Version 1.10 Update set for new IDE. drive->id is now always
* valid after probe time even with noprobe
*/
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/spinlock.h>
#include <linux/kmod.h>
#include <linux/pci.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
/**
* generic_id - add a generic drive id
* @drive: drive to make an ID block for
*
* Add a fake id field to the drive we are passed. This allows
* use to skip a ton of NULL checks (which people always miss)
* and make drive properties unconditional outside of this file
*/
static void generic_id(ide_drive_t *drive)
{
drive->id->cyls = drive->cyl;
drive->id->heads = drive->head;
drive->id->sectors = drive->sect;
drive->id->cur_cyls = drive->cyl;
drive->id->cur_heads = drive->head;
drive->id->cur_sectors = drive->sect;
}
static void ide_disk_init_chs(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
/* Extract geometry if we did not already have one for the drive */
if (!drive->cyl || !drive->head || !drive->sect) {
drive->cyl = drive->bios_cyl = id->cyls;
drive->head = drive->bios_head = id->heads;
drive->sect = drive->bios_sect = id->sectors;
}
/* Handle logical geometry translation by the drive */
if ((id->field_valid & 1) && id->cur_cyls &&
id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
drive->cyl = id->cur_cyls;
drive->head = id->cur_heads;
drive->sect = id->cur_sectors;
}
/* Use physical geometry if what we have still makes no sense */
if (drive->head > 16 && id->heads && id->heads <= 16) {
drive->cyl = id->cyls;
drive->head = id->heads;
drive->sect = id->sectors;
}
}
static void ide_disk_init_mult_count(ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
drive->mult_count = 0;
if (id->max_multsect) {
#ifdef CONFIG_IDEDISK_MULTI_MODE
id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
id->multsect_valid = id->multsect ? 1 : 0;
drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
#else /* original, pre IDE-NFG, per request of AC */
drive->mult_req = INITIAL_MULT_COUNT;
if (drive->mult_req > id->max_multsect)
drive->mult_req = id->max_multsect;
if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
drive->special.b.set_multmode = 1;
#endif
}
}
/**
* drive_is_flashcard - check for compact flash
* @drive: drive to check
*
* 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 2.4.x).
* At that time, we might also consider parameterizing the timeouts and
* retries, since these are MUCH faster than mechanical drives. -M.Lord
*/
static inline int drive_is_flashcard (ide_drive_t *drive)
{
struct hd_driveid *id = drive->id;
if (drive->removable) {
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) /* old SanDisk */
|| !strncmp(id->model, "SanDisk SDCFB", 13) /* SanDisk */
|| !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
|| !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */
|| !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
{
return 1; /* yes, it is a flash memory card */
}
}
return 0; /* no, it is not a flash memory card */
}
/**
* do_identify - identify a drive
* @drive: drive to identify
* @cmd: command used
*
* Called when we have issued a drive identify command to
* read and parse the results. This function is run with
* interrupts disabled.
*/
static inline void do_identify (ide_drive_t *drive, u8 cmd)
{
ide_hwif_t *hwif = HWIF(drive);
int bswap = 1;
struct hd_driveid *id;
id = drive->id;
/* read 512 bytes of id info */
hwif->ata_input_data(drive, id, SECTOR_WORDS);
drive->id_read = 1;
local_irq_enable();
ide_fix_driveid(id);
#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
/*
* EATA SCSI controllers do a hardware ATA emulation:
* Ignore them if there is a driver for them available.
*/
if ((id->model[0] == 'P' && id->model[1] == 'M') ||
(id->model[0] == 'S' && id->model[1] == 'K')) {
printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
goto err_misc;
}
#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
/*
* WIN_IDENTIFY returns little-endian info,
* WIN_PIDENTIFY *usually* returns little-endian info.
*/
if (cmd == WIN_PIDENTIFY) {
if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
|| (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
|| (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
/* Vertos drives may still be weird */
bswap ^= 1;
}
ide_fixstring(id->model, sizeof(id->model), bswap);
ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
if (strstr(id->model, "E X A B Y T E N E S T"))
goto err_misc;
/* we depend on this a lot! */
id->model[sizeof(id->model)-1] = '\0';
printk("%s: %s, ", drive->name, id->model);
drive->present = 1;
drive->dead = 0;
/*
* Check for an ATAPI device
*/
if (cmd == WIN_PIDENTIFY) {
u8 type = (id->config >> 8) & 0x1f;
printk("ATAPI ");
switch (type) {
case ide_floppy:
if (!strstr(id->model, "CD-ROM")) {
if (!strstr(id->model, "oppy") &&
!strstr(id->model, "poyp") &&
!strstr(id->model, "ZIP"))
printk("cdrom or floppy?, assuming ");
if (drive->media != ide_cdrom) {
printk ("FLOPPY");
drive->removable = 1;
break;
}
}
/* Early cdrom models used zero */
type = ide_cdrom;
case ide_cdrom:
drive->removable = 1;
#ifdef CONFIG_PPC
/* kludge for Apple PowerBook internal zip */
if (!strstr(id->model, "CD-ROM") &&
strstr(id->model, "ZIP")) {
printk ("FLOPPY");
type = ide_floppy;
break;
}
#endif
printk ("CD/DVD-ROM");
break;
case ide_tape:
printk ("TAPE");
break;
case ide_optical:
printk ("OPTICAL");
drive->removable = 1;
break;
default:
printk("UNKNOWN (type %d)", type);
break;
}
printk (" drive\n");
drive->media = type;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
return;
}
/*
* Not an ATAPI device: looks like a "regular" hard disk
*/
if (id->config & (1<<7))
drive->removable = 1;
if (drive_is_flashcard(drive))
drive->is_flash = 1;
drive->media = ide_disk;
printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
QUIRK_LIST(drive);
return;
err_misc:
kfree(id);
drive->present = 0;
return;
}
/**
* actual_try_to_identify - send ata/atapi identify
* @drive: drive to identify
* @cmd: command to use
*
* try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
* and waits for a response. It also monitors irqs while this is
* happening, in hope of automatically determining which one is
* being used by the interface.
*
* Returns: 0 device was identified
* 1 device timed-out (no response to identify request)
* 2 device aborted the command (refused to identify itself)
*/
static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
{
ide_hwif_t *hwif = HWIF(drive);
int rc;
unsigned long hd_status;
unsigned long timeout;
u8 s = 0, a = 0;
/* take a deep breath */
msleep(50);
if (IDE_CONTROL_REG) {
a = hwif->INB(IDE_ALTSTATUS_REG);
s = hwif->INB(IDE_STATUS_REG);
if ((a ^ s) & ~INDEX_STAT) {
printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
"ALTSTATUS(0x%02x)\n", drive->name, s, a);
/* ancient Seagate drives, broken interfaces */
hd_status = IDE_STATUS_REG;
} else {
/* use non-intrusive polling */
hd_status = IDE_ALTSTATUS_REG;
}
} else
hd_status = IDE_STATUS_REG;
/* set features register for atapi
* identify command to be sure of reply
*/
if ((cmd == WIN_PIDENTIFY))
/* disable dma & overlap */
hwif->OUTB(0, IDE_FEATURE_REG);
/* ask drive for ID */
hwif->OUTB(cmd, IDE_COMMAND_REG);
timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
timeout += jiffies;
do {
if (time_after(jiffies, timeout)) {
/* drive timed-out */
return 1;
}
/* give drive a breather */
msleep(50);
} while ((hwif->INB(hd_status)) & BUSY_STAT);
/* wait for IRQ and DRQ_STAT */
msleep(50);
if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
unsigned long flags;
/* local CPU only; some systems need this */
local_irq_save(flags);
/* drive returned ID */
do_identify(drive, cmd);
/* drive responded with ID */
rc = 0;
/* clear drive IRQ */
(void) hwif->INB(IDE_STATUS_REG);
local_irq_restore(flags);
} else {
/* drive refused ID */
rc = 2;
}
return rc;
}
/**
* try_to_identify - try to identify a drive
* @drive: drive to probe
* @cmd: command to use
*
* Issue the identify command and then do IRQ probing to
* complete the identification when needed by finding the
* IRQ the drive is attached to
*/
static int try_to_identify (ide_drive_t *drive, u8 cmd)
{
ide_hwif_t *hwif = HWIF(drive);
int retval;
int autoprobe = 0;
unsigned long cookie = 0;
/*
* Disable device irq unless we need to
* probe for it. Otherwise we'll get spurious
* interrupts during the identify-phase that
* the irq handler isn't expecting.
*/
if (IDE_CONTROL_REG) {
u8 ctl = drive->ctl | 2;
if (!hwif->irq) {
autoprobe = 1;
cookie = probe_irq_on();
/* enable device irq */
ctl &= ~2;
}
hwif->OUTB(ctl, IDE_CONTROL_REG);
}
retval = actual_try_to_identify(drive, cmd);
if (autoprobe) {
int irq;
/* mask device irq */
hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
/* clear drive IRQ */
(void) hwif->INB(IDE_STATUS_REG);
udelay(5);
irq = probe_irq_off(cookie);
if (!hwif->irq) {
if (irq > 0) {
hwif->irq = irq;
} else {
/* Mmmm.. multiple IRQs..
* don't know which was ours
*/
printk("%s: IRQ probe failed (0x%lx)\n",
drive->name, cookie);
}
}
}
return retval;
}
/**
* do_probe - probe an IDE device
* @drive: drive to probe
* @cmd: command to use
*
* do_probe() has the difficult job of finding a drive if it exists,
* without getting hung up if it doesn't exist, without trampling on
* ethernet cards, and without leaving any IRQs dangling to haunt us later.
*
* If a drive is "known" to exist (from CMOS or kernel parameters),
* but does not respond right away, the probe will "hang in there"
* for the maximum wait time (about 30 seconds), otherwise it will
* exit much more quickly.
*
* Returns: 0 device was identified
* 1 device timed-out (no response to identify request)
* 2 device aborted the command (refused to identify itself)
* 3 bad status from device (possible for ATAPI drives)
* 4 probe was not attempted because failure was obvious
*/
static int do_probe (ide_drive_t *drive, u8 cmd)
{
int rc;
ide_hwif_t *hwif = HWIF(drive);
if (drive->present) {
/* avoid waiting for inappropriate probes */
if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
return 4;
}
#ifdef DEBUG
printk("probing for %s: present=%d, media=%d, probetype=%s\n",
drive->name, drive->present, drive->media,
(cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
#endif
/* needed for some systems
* (e.g. crw9624 as drive0 with disk as slave)
*/
msleep(50);
SELECT_DRIVE(drive);
msleep(50);
if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
if (drive->select.b.unit != 0) {
/* exit with drive0 selected */
SELECT_DRIVE(&hwif->drives[0]);
/* allow BUSY_STAT to assert & clear */
msleep(50);
}
/* no i/f present: mmm.. this should be a 4 -ml */
return 3;
}
if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
drive->present || cmd == WIN_PIDENTIFY) {
/* send cmd and wait */
if ((rc = try_to_identify(drive, cmd))) {
/* failed: try again */
rc = try_to_identify(drive,cmd);
}
if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
return 4;
if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
((drive->autotune == IDE_TUNE_DEFAULT) ||
(drive->autotune == IDE_TUNE_AUTO))) {
unsigned long timeout;
printk("%s: no response (status = 0x%02x), "
"resetting drive\n", drive->name,
hwif->INB(IDE_STATUS_REG));
msleep(50);
hwif->OUTB(drive->select.all, IDE_SELECT_REG);
msleep(50);
hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
timeout = jiffies;
while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
time_before(jiffies, timeout + WAIT_WORSTCASE))
msleep(50);
rc = try_to_identify(drive, cmd);
}
if (rc == 1)
printk("%s: no response (status = 0x%02x)\n",
drive->name, hwif->INB(IDE_STATUS_REG));
/* ensure drive irq is clear */
(void) hwif->INB(IDE_STATUS_REG);
} else {
/* not present or maybe ATAPI */
rc = 3;
}
if (drive->select.b.unit != 0) {
/* exit with drive0 selected */
SELECT_DRIVE(&hwif->drives[0]);
msleep(50);
/* ensure drive irq is clear */
(void) hwif->INB(IDE_STATUS_REG);
}
return rc;
}
/*
*
*/
static void enable_nest (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
unsigned long timeout;
printk("%s: enabling %s -- ", hwif->name, drive->id->model);
SELECT_DRIVE(drive);
msleep(50);
hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
timeout = jiffies + WAIT_WORSTCASE;
do {
if (time_after(jiffies, timeout)) {
printk("failed (timeout)\n");
return;
}
msleep(50);
} while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
msleep(50);
if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
} else {
printk("success\n");
}
/* if !(success||timed-out) */
if (do_probe(drive, WIN_IDENTIFY) >= 2) {
/* look for ATAPI device */
(void) do_probe(drive, WIN_PIDENTIFY);
}
}
/**
* probe_for_drives - upper level drive probe
* @drive: drive to probe for
*
* probe_for_drive() tests for existence of a given drive using do_probe()
* and presents things to the user as needed.
*
* Returns: 0 no device was found
* 1 device was found (note: drive->present might
* still be 0)
*/
static inline u8 probe_for_drive (ide_drive_t *drive)
{
/*
* In order to keep things simple we have an id
* block for all drives at all times. If the device
* is pre ATA or refuses ATA/ATAPI identify we
* will add faked data to this.
*
* Also note that 0 everywhere means "can't do X"
*/
drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
drive->id_read = 0;
if(drive->id == NULL)
{
printk(KERN_ERR "ide: out of memory for id data.\n");
return 0;
}
strcpy(drive->id->model, "UNKNOWN");
/* skip probing? */
if (!drive->noprobe)
{
/* if !(success||timed-out) */
if (do_probe(drive, WIN_IDENTIFY) >= 2) {
/* look for ATAPI device */
(void) do_probe(drive, WIN_PIDENTIFY);
}
if (strstr(drive->id->model, "E X A B Y T E N E S T"))
enable_nest(drive);
if (!drive->present)
/* drive not found */
return 0;
/* identification failed? */
if (!drive->id_read) {
if (drive->media == ide_disk) {
printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
drive->name, drive->cyl,
drive->head, drive->sect);
} else if (drive->media == ide_cdrom) {
printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
} else {
/* nuke it */
printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
drive->present = 0;
}
}
/* drive was found */
}
if(!drive->present)
return 0;
/* The drive wasn't being helpful. Add generic info only */
if (drive->id_read == 0) {
generic_id(drive);
return 1;
}
if (drive->media == ide_disk) {
ide_disk_init_chs(drive);
ide_disk_init_mult_count(drive);
}
return drive->present;
}
static void hwif_release_dev (struct device *dev)
{
ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
up(&hwif->gendev_rel_sem);
}
static void hwif_register (ide_hwif_t *hwif)
{
/* register with global device tree */
strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
hwif->gendev.driver_data = hwif;
if (hwif->gendev.parent == NULL) {
if (hwif->pci_dev)
hwif->gendev.parent = &hwif->pci_dev->dev;
else
/* Would like to do = &device_legacy */
hwif->gendev.parent = NULL;
}
hwif->gendev.release = hwif_release_dev;
device_register(&hwif->gendev);
}
static int wait_hwif_ready(ide_hwif_t *hwif)
{
int rc;
printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
/* Let HW settle down a bit from whatever init state we
* come from */
mdelay(2);
/* Wait for BSY bit to go away, spec timeout is 30 seconds,
* I know of at least one disk who takes 31 seconds, I use 35
* here to be safe
*/
rc = ide_wait_not_busy(hwif, 35000);
if (rc)
return rc;
/* Now make sure both master & slave are ready */
SELECT_DRIVE(&hwif->drives[0]);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
if (rc)
return rc;
SELECT_DRIVE(&hwif->drives[1]);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
/* Exit function with master reselected (let's be sane) */
SELECT_DRIVE(&hwif->drives[0]);
return rc;
}
/**
* ide_undecoded_slave - look for bad CF adapters
* @hwif: interface
*
* Analyse the drives on the interface and attempt to decide if we
* have the same drive viewed twice. This occurs with crap CF adapters
* and PCMCIA sometimes.
*/
void ide_undecoded_slave(ide_hwif_t *hwif)
{
ide_drive_t *drive0 = &hwif->drives[0];
ide_drive_t *drive1 = &hwif->drives[1];
if (drive0->present == 0 || drive1->present == 0)
return;
/* If the models don't match they are not the same product */
if (strcmp(drive0->id->model, drive1->id->model))
return;
/* Serial numbers do not match */
if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
return;
/* No serial number, thankfully very rare for CF */
if (drive0->id->serial_no[0] == 0)
return;
/* Appears to be an IDE flash adapter with decode bugs */
printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
drive1->present = 0;
}
EXPORT_SYMBOL_GPL(ide_undecoded_slave);
/*
* This routine only knows how to look for drive units 0 and 1
* on an interface, so any setting of MAX_DRIVES > 2 won't work here.
*/
static void probe_hwif(ide_hwif_t *hwif)
{
unsigned int unit;
unsigned long flags;
unsigned int irqd;
if (hwif->noprobe)
return;
if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
(ide_hwif_request_regions(hwif))) {
u16 msgout = 0;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
if (drive->present) {
drive->present = 0;
printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
drive->name);
msgout = 1;
}
}
if (!msgout)
printk(KERN_ERR "%s: ports already in use, skipping probe\n",
hwif->name);
return;
}
/*
* We must always disable IRQ, as probe_for_drive will assert IRQ, but
* we'll install our IRQ driver much later...
*/
irqd = hwif->irq;
if (irqd)
disable_irq(hwif->irq);
local_irq_set(flags);
/* This is needed on some PPCs and a bunch of BIOS-less embedded
* platforms. Typical cases are:
*
* - The firmware hard reset the disk before booting the kernel,
* the drive is still doing it's poweron-reset sequence, that
* can take up to 30 seconds
* - The firmware does nothing (or no firmware), the device is
* still in POST state (same as above actually).
* - Some CD/DVD/Writer combo drives tend to drive the bus during
* their reset sequence even when they are non-selected slave
* devices, thus preventing discovery of the main HD
*
* Doing this wait-for-busy should not harm any existing configuration
* (at least things won't be worse than what current code does, that
* is blindly go & talk to the drive) and fix some issues like the
* above.
*
* BenH.
*/
if (wait_hwif_ready(hwif) == -EBUSY)
printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
/*
* Second drive should only exist if first drive was found,
* but a lot of cdrom drives are configured as single slaves.
*/
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
drive->dn = (hwif->channel ? 2 : 0) + unit;
(void) probe_for_drive(drive);
if (drive->present && !hwif->present) {
hwif->present = 1;
if (hwif->chipset != ide_4drives ||
!hwif->mate ||
!hwif->mate->present) {
hwif_register(hwif);
}
}
}
if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
unsigned long timeout = jiffies + WAIT_WORSTCASE;
u8 stat;
printk(KERN_WARNING "%s: reset\n", hwif->name);
hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
udelay(10);
hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
do {
msleep(50);
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
} while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
}
local_irq_restore(flags);
/*
* Use cached IRQ number. It might be (and is...) changed by probe
* code above
*/
if (irqd)
enable_irq(irqd);
if (!hwif->present) {
ide_hwif_release_regions(hwif);
return;
}
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
if (drive->present) {
if (hwif->tuneproc != NULL &&
drive->autotune == IDE_TUNE_AUTO)
/* auto-tune PIO mode */
hwif->tuneproc(drive, 255);
if (drive->autotune != IDE_TUNE_DEFAULT &&
drive->autotune != IDE_TUNE_AUTO)
continue;
drive->nice1 = 1;
/*
* MAJOR HACK BARF :-/
*
* FIXME: chipsets own this cruft!
*/
/*
* Move here to prevent module loading clashing.
*/
// drive->autodma = hwif->autodma;
if (hwif->ide_dma_check) {
/*
* Force DMAing for the beginning of the check.
* Some chipsets appear to do interesting
* things, if not checked and cleared.
* PARANOIA!!!
*/
hwif->ide_dma_off_quietly(drive);
#ifdef CONFIG_IDEDMA_ONLYDISK
if (drive->media == ide_disk)
#endif
hwif->ide_dma_check(drive);
}
}
}
}
static int hwif_init(ide_hwif_t *hwif);
int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
{
probe_hwif(hwif);
if (fixup)
fixup(hwif);
if (!hwif_init(hwif)) {
printk(KERN_INFO "%s: failed to initialize IDE interface\n",
hwif->name);
return -1;
}
if (hwif->present) {
u16 unit = 0;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
/* For now don't attach absent drives, we may
want them on default or a new "empty" class
for hotplug reprobing ? */
if (drive->present) {
device_register(&drive->gendev);
}
}
}
return 0;
}
int probe_hwif_init(ide_hwif_t *hwif)
{
return probe_hwif_init_with_fixup(hwif, NULL);
}
EXPORT_SYMBOL(probe_hwif_init);
#if MAX_HWIFS > 1
/*
* save_match() is used to simplify logic in init_irq() below.
*
* A loophole here is that we may not know about a particular
* hwif's irq until after that hwif is actually probed/initialized..
* This could be a problem for the case where an hwif is on a
* dual interface that requires serialization (eg. cmd640) and another
* hwif using one of the same irqs is initialized beforehand.
*
* This routine detects and reports such situations, but does not fix them.
*/
static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
{
ide_hwif_t *m = *match;
if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
if (!new->hwgroup)
return;
printk("%s: potential irq problem with %s and %s\n",
hwif->name, new->name, m->name);
}
if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
*match = new;
}
#endif /* MAX_HWIFS > 1 */
/*
* init request queue
*/
static int ide_init_queue(ide_drive_t *drive)
{
request_queue_t *q;
ide_hwif_t *hwif = HWIF(drive);
int max_sectors = 256;
int max_sg_entries = PRD_ENTRIES;
/*
* Our default set up assumes the normal IDE case,
* that is 64K segmenting, standard PRD setup
* and LBA28. Some drivers then impose their own
* limits and LBA48 we could raise it but as yet
* do not.
*/
q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
if (!q)
return 1;
q->queuedata = drive;
blk_queue_segment_boundary(q, 0xffff);
if (!hwif->rqsize) {
if (hwif->no_lba48 || hwif->no_lba48_dma)
hwif->rqsize = 256;
else
hwif->rqsize = 65536;
}
if (hwif->rqsize < max_sectors)
max_sectors = hwif->rqsize;
blk_queue_max_sectors(q, max_sectors);
#ifdef CONFIG_PCI
/* When we have an IOMMU, we may have a problem where pci_map_sg()
* creates segments that don't completely match our boundary
* requirements and thus need to be broken up again. Because it
* doesn't align properly either, we may actually have to break up
* to more segments than what was we got in the first place, a max
* worst case is twice as many.
* This will be fixed once we teach pci_map_sg() about our boundary
* requirements, hopefully soon. *FIXME*
*/
if (!PCI_DMA_BUS_IS_PHYS)
max_sg_entries >>= 1;
#endif /* CONFIG_PCI */
blk_queue_max_hw_segments(q, max_sg_entries);
blk_queue_max_phys_segments(q, max_sg_entries);
/* assign drive queue */
drive->queue = q;
/* needs drive->queue to be set */
ide_toggle_bounce(drive, 1);
/* enable led activity for disk drives only */
if (drive->media == ide_disk && hwif->led_act)
blk_queue_activity_fn(q, hwif->led_act, drive);
return 0;
}
/*
* This routine sets up the irq for an ide interface, and creates a new
* hwgroup for the irq/hwif if none was previously assigned.
*
* Much of the code is for correctly detecting/handling irq sharing
* and irq serialization situations. This is somewhat complex because
* it handles static as well as dynamic (PCMCIA) IDE interfaces.
*
* The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
* interrupts completely disabled. This can be bad for interrupt latency,
* but anything else has led to problems on some machines. We re-enable
* interrupts as much as we can safely do in most places.
*/
static int init_irq (ide_hwif_t *hwif)
{
unsigned int index;
ide_hwgroup_t *hwgroup;
ide_hwif_t *match = NULL;
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
BUG_ON(hwif == NULL);
down(&ide_cfg_sem);
hwif->hwgroup = NULL;
#if MAX_HWIFS > 1
/*
* Group up with any other hwifs that share our irq(s).
*/
for (index = 0; index < MAX_HWIFS; index++) {
ide_hwif_t *h = &ide_hwifs[index];
if (h->hwgroup) { /* scan only initialized hwif's */
if (hwif->irq == h->irq) {
hwif->sharing_irq = h->sharing_irq = 1;
if (hwif->chipset != ide_pci ||
h->chipset != ide_pci) {
save_match(hwif, h, &match);
}
}
if (hwif->serialized) {
if (hwif->mate && hwif->mate->irq == h->irq)
save_match(hwif, h, &match);
}
if (h->serialized) {
if (h->mate && hwif->irq == h->mate->irq)
save_match(hwif, h, &match);
}
}
}
#endif /* MAX_HWIFS > 1 */
/*
* If we are still without a hwgroup, then form a new one
*/
if (match) {
hwgroup = match->hwgroup;
hwif->hwgroup = hwgroup;
/*
* Link us into the hwgroup.
* This must be done early, do ensure that unexpected_intr
* can find the hwif and prevent irq storms.
* No drives are attached to the new hwif, choose_drive
* can't do anything stupid (yet).
* Add ourself as the 2nd entry to the hwgroup->hwif
* linked list, the first entry is the hwif that owns
* hwgroup->handler - do not change that.
*/
spin_lock_irq(&ide_lock);
hwif->next = hwgroup->hwif->next;
hwgroup->hwif->next = hwif;
spin_unlock_irq(&ide_lock);
} else {
hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
hwif_to_node(hwif->drives[0].hwif));
if (!hwgroup)
goto out_up;
hwif->hwgroup = hwgroup;
memset(hwgroup, 0, sizeof(ide_hwgroup_t));
hwgroup->hwif = hwif->next = hwif;
hwgroup->rq = NULL;
hwgroup->handler = NULL;
hwgroup->drive = NULL;
hwgroup->busy = 0;
init_timer(&hwgroup->timer);
hwgroup->timer.function = &ide_timer_expiry;
hwgroup->timer.data = (unsigned long) hwgroup;
}
/*
* Allocate the irq, if not already obtained for another hwif
*/
if (!match || match->irq != hwif->irq) {
int sa = SA_INTERRUPT;
#if defined(__mc68000__) || defined(CONFIG_APUS)
sa = SA_SHIRQ;
#endif /* __mc68000__ || CONFIG_APUS */
if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
sa = SA_SHIRQ;
#ifndef CONFIG_IDEPCI_SHARE_IRQ
sa |= SA_INTERRUPT;
#endif /* CONFIG_IDEPCI_SHARE_IRQ */
}
if (hwif->io_ports[IDE_CONTROL_OFFSET])
/* clear nIEN */
hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
goto out_unlink;
}
/*
* For any present drive:
* - allocate the block device queue
* - link drive into the hwgroup
*/
for (index = 0; index < MAX_DRIVES; ++index) {
ide_drive_t *drive = &hwif->drives[index];
if (!drive->present)
continue;
if (ide_init_queue(drive)) {
printk(KERN_ERR "ide: failed to init %s\n",drive->name);
continue;
}
spin_lock_irq(&ide_lock);
if (!hwgroup->drive) {
/* first drive for hwgroup. */
drive->next = drive;
hwgroup->drive = drive;
hwgroup->hwif = HWIF(hwgroup->drive);
} else {
drive->next = hwgroup->drive->next;
hwgroup->drive->next = drive;
}
spin_unlock_irq(&ide_lock);
}
#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
hwif->io_ports[IDE_DATA_OFFSET],
hwif->io_ports[IDE_DATA_OFFSET]+7,
hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
#elif defined(__sparc__)
printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
hwif->io_ports[IDE_DATA_OFFSET],
hwif->io_ports[IDE_DATA_OFFSET]+7,
hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
#else
printk("%s at 0x%08lx on irq %d", hwif->name,
hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
#endif /* __mc68000__ && CONFIG_APUS */
if (match)
printk(" (%sed with %s)",
hwif->sharing_irq ? "shar" : "serializ", match->name);
printk("\n");
up(&ide_cfg_sem);
return 0;
out_unlink:
spin_lock_irq(&ide_lock);
if (hwif->next == hwif) {
BUG_ON(match);
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
ide_hwif_t *g;
g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Impossible. */
printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
spin_unlock_irq(&ide_lock);
out_up:
up(&ide_cfg_sem);
return 1;
}
static int ata_lock(dev_t dev, void *data)
{
/* FIXME: we want to pin hwif down */
return 0;
}
static struct kobject *ata_probe(dev_t dev, int *part, void *data)
{
ide_hwif_t *hwif = data;
int unit = *part >> PARTN_BITS;
ide_drive_t *drive = &hwif->drives[unit];
if (!drive->present)
return NULL;
if (drive->media == ide_disk)
request_module("ide-disk");
if (drive->scsi)
request_module("ide-scsi");
if (drive->media == ide_cdrom || drive->media == ide_optical)
request_module("ide-cd");
if (drive->media == ide_tape)
request_module("ide-tape");
if (drive->media == ide_floppy)
request_module("ide-floppy");
return NULL;
}
static struct kobject *exact_match(dev_t dev, int *part, void *data)
{
struct gendisk *p = data;
*part &= (1 << PARTN_BITS) - 1;
return &p->kobj;
}
static int exact_lock(dev_t dev, void *data)
{
struct gendisk *p = data;
if (!get_disk(p))
return -1;
return 0;
}
void ide_register_region(struct gendisk *disk)
{
blk_register_region(MKDEV(disk->major, disk->first_minor),
disk->minors, NULL, exact_match, exact_lock, disk);
}
EXPORT_SYMBOL_GPL(ide_register_region);
void ide_unregister_region(struct gendisk *disk)
{
blk_unregister_region(MKDEV(disk->major, disk->first_minor),
disk->minors);
}
EXPORT_SYMBOL_GPL(ide_unregister_region);
void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
unsigned int unit = (drive->select.all >> 4) & 1;
disk->major = hwif->major;
disk->first_minor = unit << PARTN_BITS;
sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
disk->queue = drive->queue;
}
EXPORT_SYMBOL_GPL(ide_init_disk);
static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
if (drive == drive->next) {
/* special case: last drive from hwgroup. */
BUG_ON(hwgroup->drive != drive);
hwgroup->drive = NULL;
} else {
ide_drive_t *walk;
walk = hwgroup->drive;
while (walk->next != drive)
walk = walk->next;
walk->next = drive->next;
if (hwgroup->drive == drive) {
hwgroup->drive = drive->next;
hwgroup->hwif = hwgroup->drive->hwif;
}
}
BUG_ON(hwgroup->drive == drive);
}
static void drive_release_dev (struct device *dev)
{
ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
spin_lock_irq(&ide_lock);
if (drive->devfs_name[0] != '\0') {
devfs_remove(drive->devfs_name);
drive->devfs_name[0] = '\0';
}
ide_remove_drive_from_hwgroup(drive);
if (drive->id != NULL) {
kfree(drive->id);
drive->id = NULL;
}
drive->present = 0;
/* Messed up locking ... */
spin_unlock_irq(&ide_lock);
blk_cleanup_queue(drive->queue);
spin_lock_irq(&ide_lock);
drive->queue = NULL;
spin_unlock_irq(&ide_lock);
up(&drive->gendev_rel_sem);
}
/*
* init_gendisk() (as opposed to ide_geninit) is called for each major device,
* after probing for drives, to allocate partition tables and other data
* structures needed for the routines in genhd.c. ide_geninit() gets called
* somewhat later, during the partition check.
*/
static void init_gendisk (ide_hwif_t *hwif)
{
unsigned int unit;
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t * drive = &hwif->drives[unit];
ide_add_generic_settings(drive);
snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
hwif->index,unit);
drive->gendev.parent = &hwif->gendev;
drive->gendev.bus = &ide_bus_type;
drive->gendev.driver_data = drive;
drive->gendev.release = drive_release_dev;
if (drive->present) {
sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
(hwif->channel && hwif->mate) ?
hwif->mate->index : hwif->index,
hwif->channel, unit, drive->lun);
}
}
blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
THIS_MODULE, ata_probe, ata_lock, hwif);
}
static int hwif_init(ide_hwif_t *hwif)
{
int old_irq;
/* Return success if no device is connected */
if (!hwif->present)
return 1;
if (!hwif->irq) {
if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
{
printk("%s: DISABLED, NO IRQ\n", hwif->name);
return (hwif->present = 0);
}
}
#ifdef CONFIG_BLK_DEV_HD
if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
printk("%s: CANNOT SHARE IRQ WITH OLD "
"HARDDISK DRIVER (hd.c)\n", hwif->name);
return (hwif->present = 0);
}
#endif /* CONFIG_BLK_DEV_HD */
/* we set it back to 1 if all is ok below */
hwif->present = 0;
if (register_blkdev(hwif->major, hwif->name))
return 0;
if (!hwif->sg_max_nents)
hwif->sg_max_nents = PRD_ENTRIES;
hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
GFP_KERNEL);
if (!hwif->sg_table) {
printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
goto out;
}
if (init_irq(hwif) == 0)
goto done;
old_irq = hwif->irq;
/*
* It failed to initialise. Find the default IRQ for
* this port and try that.
*/
if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
printk("%s: Disabled unable to get IRQ %d.\n",
hwif->name, old_irq);
goto out;
}
if (init_irq(hwif)) {
printk("%s: probed IRQ %d and default IRQ %d failed.\n",
hwif->name, old_irq, hwif->irq);
goto out;
}
printk("%s: probed IRQ %d failed, using default.\n",
hwif->name, hwif->irq);
done:
init_gendisk(hwif);
hwif->present = 1; /* success */
return 1;
out:
unregister_blkdev(hwif->major, hwif->name);
return 0;
}
int ideprobe_init (void)
{
unsigned int index;
int probe[MAX_HWIFS];
memset(probe, 0, MAX_HWIFS * sizeof(int));
for (index = 0; index < MAX_HWIFS; ++index)
probe[index] = !ide_hwifs[index].present;
for (index = 0; index < MAX_HWIFS; ++index)
if (probe[index])
probe_hwif(&ide_hwifs[index]);
for (index = 0; index < MAX_HWIFS; ++index)
if (probe[index])
hwif_init(&ide_hwifs[index]);
for (index = 0; index < MAX_HWIFS; ++index) {
if (probe[index]) {
ide_hwif_t *hwif = &ide_hwifs[index];
int unit;
if (!hwif->present)
continue;
if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
hwif->chipset = ide_generic;
for (unit = 0; unit < MAX_DRIVES; ++unit)
if (hwif->drives[unit].present)
device_register(&hwif->drives[unit].gendev);
}
}
return 0;
}
EXPORT_SYMBOL_GPL(ideprobe_init);