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linux/drivers/ide/ide-probe.c
Bartlomiej Zolnierkiewicz e1771e20c8 ide: fix comment in init_irq() 
APUS support is gone...

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-02-11 00:32:15 +01:00

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36 KiB
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/*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
*/
/*
* 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.
*
* -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
* by Andrea Arcangeli
*/
#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/spinlock.h>
#include <linux/kmod.h>
#include <linux/pci.h>
#include <linux/scatterlist.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 : 0;
drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
#else /* original, pre IDE-NFG, per request of AC */
drive->mult_req = 0;
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
}
}
/**
* 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();
#ifdef DEBUG
printk(KERN_INFO "%s: dumping identify data\n", drive->name);
ide_dump_identify((u8 *)id);
#endif
ide_fix_driveid(id);
#if 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 || 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);
/* we depend on this a lot! */
id->model[sizeof(id->model)-1] = '\0';
if (strstr(id->model, "E X A B Y T E N E S T"))
goto err_misc;
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
*/
/*
* 0x848a = CompactFlash device
* These are *not* removable in Linux definition of the term
*/
if ((id->config != 0x848a) && (id->config & (1<<7)))
drive->removable = 1;
drive->media = ide_disk;
printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
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 use_altstatus = 0, rc;
unsigned long timeout;
u8 s = 0, a = 0;
/* take a deep breath */
msleep(50);
if (IDE_CONTROL_REG) {
a = ide_read_altstatus(drive);
s = ide_read_status(drive);
if ((a ^ s) & ~INDEX_STAT)
/* ancient Seagate drives, broken interfaces */
printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
"instead of ALTSTATUS(0x%02x)\n",
drive->name, s, a);
else
/* use non-intrusive polling */
use_altstatus = 1;
}
/* 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);
s = use_altstatus ? ide_read_altstatus(drive)
: ide_read_status(drive);
} while (s & BUSY_STAT);
/* wait for IRQ and DRQ_STAT */
msleep(50);
s = ide_read_status(drive);
if (OK_STAT(s, 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)ide_read_status(drive);
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) {
if (!hwif->irq) {
autoprobe = 1;
cookie = probe_irq_on();
}
ide_set_irq(drive, autoprobe);
}
retval = actual_try_to_identify(drive, cmd);
if (autoprobe) {
int irq;
ide_set_irq(drive, 0);
/* clear drive IRQ */
(void)ide_read_status(drive);
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;
}
static int ide_busy_sleep(ide_hwif_t *hwif)
{
unsigned long timeout = jiffies + WAIT_WORSTCASE;
u8 stat;
do {
msleep(50);
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
if ((stat & BUSY_STAT) == 0)
return 0;
} while (time_before(jiffies, timeout));
return 1;
}
/**
* 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)
{
ide_hwif_t *hwif = HWIF(drive);
int rc;
u8 stat;
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;
}
stat = ide_read_status(drive);
if (OK_STAT(stat, 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);
}
stat = ide_read_status(drive);
if (stat == (BUSY_STAT | READY_STAT))
return 4;
if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
((drive->autotune == IDE_TUNE_DEFAULT) ||
(drive->autotune == IDE_TUNE_AUTO))) {
printk(KERN_ERR "%s: no response (status = 0x%02x), "
"resetting drive\n", drive->name, stat);
msleep(50);
hwif->OUTB(drive->select.all, IDE_SELECT_REG);
msleep(50);
hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
(void)ide_busy_sleep(hwif);
rc = try_to_identify(drive, cmd);
}
/* ensure drive IRQ is clear */
stat = ide_read_status(drive);
if (rc == 1)
printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
drive->name, stat);
} 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)ide_read_status(drive);
}
return rc;
}
/*
*
*/
static void enable_nest (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
printk("%s: enabling %s -- ", hwif->name, drive->id->model);
SELECT_DRIVE(drive);
msleep(50);
hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
if (ide_busy_sleep(hwif)) {
printk(KERN_CONT "failed (timeout)\n");
return;
}
msleep(50);
stat = ide_read_status(drive);
if (!OK_STAT(stat, 0, BAD_STAT))
printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
else
printk(KERN_CONT "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 (!drive->present)
/* drive not found */
return 0;
if (strstr(drive->id->model, "E X A B Y T E N E S T"))
enable_nest(drive);
/* 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);
complete(&hwif->gendev_rel_comp);
}
static void ide_register_port(ide_hwif_t *hwif)
{
int ret;
/* 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->dev)
hwif->gendev.parent = hwif->dev;
else
/* Would like to do = &device_legacy */
hwif->gendev.parent = NULL;
}
hwif->gendev.release = hwif_release_dev;
ret = device_register(&hwif->gendev);
if (ret < 0)
printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
__FUNCTION__, ret);
}
/**
* ide_port_wait_ready - wait for port to become ready
* @hwif: IDE port
*
* 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-non-busy should not harm any existing
* configuration and fix some issues like the above.
*
* BenH.
*
* Returns 0 on success, error code (< 0) otherwise.
*/
static int ide_port_wait_ready(ide_hwif_t *hwif)
{
int unit, 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 */
for (unit = 0; unit < MAX_DRIVES; unit++) {
ide_drive_t *drive = &hwif->drives[unit];
/* Ignore disks that we will not probe for later. */
if (!drive->noprobe || drive->present) {
SELECT_DRIVE(drive);
ide_set_irq(drive, 1);
mdelay(2);
rc = ide_wait_not_busy(hwif, 35000);
if (rc)
goto out;
} else
printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
drive->name);
}
out:
/* Exit function with master reselected (let's be sane) */
if (unit)
SELECT_DRIVE(&hwif->drives[0]);
return rc;
}
/**
* ide_undecoded_slave - look for bad CF adapters
* @drive1: drive
*
* 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_drive_t *drive1)
{
ide_drive_t *drive0 = &drive1->hwif->drives[0];
if ((drive1->dn & 1) == 0 || drive0->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);
static int ide_probe_port(ide_hwif_t *hwif)
{
unsigned long flags;
unsigned int irqd;
int unit, rc = -ENODEV;
BUG_ON(hwif->present);
if (hwif->noprobe)
return -EACCES;
/*
* 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);
if (ide_port_wait_ready(hwif) == -EBUSY)
printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
/*
* Need to probe slave device first to make it release PDIAG-.
*/
for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
ide_drive_t *drive = &hwif->drives[unit];
drive->dn = (hwif->channel ? 2 : 0) + unit;
(void) probe_for_drive(drive);
if (drive->present)
rc = 0;
}
if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
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]);
(void)ide_busy_sleep(hwif);
}
local_irq_restore(flags);
/*
* Use cached IRQ number. It might be (and is...) changed by probe
* code above
*/
if (irqd)
enable_irq(irqd);
return rc;
}
static void ide_port_tune_devices(ide_hwif_t *hwif)
{
int unit;
for (unit = 0; unit < MAX_DRIVES; unit++) {
ide_drive_t *drive = &hwif->drives[unit];
if (drive->present && hwif->quirkproc)
hwif->quirkproc(drive);
}
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
if (drive->present) {
if (drive->autotune == IDE_TUNE_AUTO)
ide_set_max_pio(drive);
if (drive->autotune != IDE_TUNE_DEFAULT &&
drive->autotune != IDE_TUNE_AUTO)
continue;
drive->nice1 = 1;
if (hwif->dma_host_set)
ide_set_dma(drive);
}
}
for (unit = 0; unit < MAX_DRIVES; ++unit) {
ide_drive_t *drive = &hwif->drives[unit];
if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
drive->no_io_32bit = 1;
else
drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
}
}
#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)
{
struct request_queue *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 < 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);
return 0;
}
static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
{
ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
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);
}
/*
* For any present drive:
* - allocate the block device queue
* - link drive into the hwgroup
*/
static void ide_port_setup_devices(ide_hwif_t *hwif)
{
int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive = &hwif->drives[i];
if (!drive->present)
continue;
if (ide_init_queue(drive)) {
printk(KERN_ERR "ide: failed to init %s\n",
drive->name);
continue;
}
ide_add_drive_to_hwgroup(drive);
}
}
/*
* 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.
*/
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);
mutex_lock(&ide_cfg_mtx);
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;
BUG_ON(hwif->next == hwif);
spin_unlock_irq(&ide_lock);
} else {
hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
hwif_to_node(hwif));
if (hwgroup == NULL)
goto out_up;
hwif->hwgroup = hwgroup;
hwgroup->hwif = hwif->next = hwif;
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 = 0;
#if defined(__mc68000__)
sa = IRQF_SHARED;
#endif /* __mc68000__ */
if (IDE_CHIPSET_IS_PCI(hwif->chipset))
sa = IRQF_SHARED;
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;
}
if (!hwif->rqsize) {
if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
(hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
hwif->rqsize = 256;
else
hwif->rqsize = 65536;
}
#if !defined(__mc68000__)
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);
#else
printk("%s at 0x%08lx on irq %d", hwif->name,
hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
#endif /* __mc68000__ */
if (match)
printk(" (%sed with %s)",
hwif->sharing_irq ? "shar" : "serializ", match->name);
printk("\n");
ide_port_setup_devices(hwif);
mutex_unlock(&ide_cfg_mtx);
return 0;
out_unlink:
ide_remove_port_from_hwgroup(hwif);
out_up:
mutex_unlock(&ide_cfg_mtx);
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->dev.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);
ide_remove_drive_from_hwgroup(drive);
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);
complete(&drive->gendev_rel_comp);
}
static int hwif_init(ide_hwif_t *hwif)
{
int old_irq;
if (!hwif->irq) {
if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
{
printk("%s: DISABLED, NO IRQ\n", hwif->name);
return 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 0;
}
#endif /* CONFIG_BLK_DEV_HD */
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;
}
sg_init_table(hwif->sg_table, hwif->sg_max_nents);
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:
blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
THIS_MODULE, ata_probe, ata_lock, hwif);
return 1;
out:
unregister_blkdev(hwif->major, hwif->name);
return 0;
}
static void hwif_register_devices(ide_hwif_t *hwif)
{
unsigned int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive = &hwif->drives[i];
struct device *dev = &drive->gendev;
int ret;
if (!drive->present)
continue;
ide_add_generic_settings(drive);
snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
dev->parent = &hwif->gendev;
dev->bus = &ide_bus_type;
dev->driver_data = drive;
dev->release = drive_release_dev;
ret = device_register(dev);
if (ret < 0)
printk(KERN_WARNING "IDE: %s: device_register error: "
"%d\n", __func__, ret);
}
}
static void ide_port_init_devices(ide_hwif_t *hwif)
{
int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive = &hwif->drives[i];
if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
drive->io_32bit = 1;
if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
drive->unmask = 1;
if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
drive->no_unmask = 1;
if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
drive->autotune = 1;
}
if (hwif->port_init_devs)
hwif->port_init_devs(hwif);
}
static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
const struct ide_port_info *d)
{
if (d->chipset != ide_etrax100)
hwif->channel = port;
if (d->chipset)
hwif->chipset = d->chipset;
if (d->init_iops)
d->init_iops(hwif);
if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0)
ide_hwif_setup_dma(hwif, d);
if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
(d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
hwif->irq = port ? 15 : 14;
hwif->host_flags = d->host_flags;
hwif->pio_mask = d->pio_mask;
if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
hwif->mate->serialized = hwif->serialized = 1;
hwif->swdma_mask = d->swdma_mask;
hwif->mwdma_mask = d->mwdma_mask;
hwif->ultra_mask = d->udma_mask;
/* reset DMA masks only for SFF-style DMA controllers */
if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0 && hwif->dma_base == 0)
hwif->swdma_mask = hwif->mwdma_mask = hwif->ultra_mask = 0;
if (d->host_flags & IDE_HFLAG_RQSIZE_256)
hwif->rqsize = 256;
/* call chipset specific routine for each enabled port */
if (d->init_hwif)
d->init_hwif(hwif);
if (hwif->cable_detect && (hwif->ultra_mask & 0x78)) {
if (hwif->cbl != ATA_CBL_PATA40_SHORT)
hwif->cbl = hwif->cable_detect(hwif);
}
}
int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
{
ide_hwif_t *hwif, *mate = NULL;
int i, rc = 0;
for (i = 0; i < MAX_HWIFS; i++) {
if (d == NULL || idx[i] == 0xff) {
mate = NULL;
continue;
}
hwif = &ide_hwifs[idx[i]];
if (d->chipset != ide_etrax100 && (i & 1) && mate) {
hwif->mate = mate;
mate->mate = hwif;
}
mate = (i & 1) ? NULL : hwif;
ide_init_port(hwif, i & 1, d);
ide_port_init_devices(hwif);
}
for (i = 0; i < MAX_HWIFS; i++) {
if (idx[i] == 0xff)
continue;
hwif = &ide_hwifs[idx[i]];
if ((hwif->chipset != ide_4drives || !hwif->mate ||
!hwif->mate->present) && ide_hwif_request_regions(hwif)) {
printk(KERN_ERR "%s: ports already in use, "
"skipping probe\n", hwif->name);
continue;
}
if (ide_probe_port(hwif) < 0) {
ide_hwif_release_regions(hwif);
continue;
}
hwif->present = 1;
if (hwif->chipset != ide_4drives || !hwif->mate ||
!hwif->mate->present)
ide_register_port(hwif);
ide_port_tune_devices(hwif);
}
for (i = 0; i < MAX_HWIFS; i++) {
if (idx[i] == 0xff)
continue;
hwif = &ide_hwifs[idx[i]];
if (!hwif->present)
continue;
if (hwif_init(hwif) == 0) {
printk(KERN_INFO "%s: failed to initialize IDE "
"interface\n", hwif->name);
hwif->present = 0;
rc = -1;
continue;
}
ide_acpi_init(hwif);
ide_acpi_port_init_devices(hwif);
}
for (i = 0; i < MAX_HWIFS; i++) {
if (idx[i] == 0xff)
continue;
hwif = &ide_hwifs[idx[i]];
if (hwif->present) {
if (hwif->chipset == ide_unknown ||
hwif->chipset == ide_forced)
hwif->chipset = ide_generic;
hwif_register_devices(hwif);
}
}
for (i = 0; i < MAX_HWIFS; i++) {
if (idx[i] == 0xff)
continue;
hwif = &ide_hwifs[idx[i]];
if (hwif->present) {
ide_proc_register_port(hwif);
ide_proc_port_register_devices(hwif);
}
}
return rc;
}
EXPORT_SYMBOL_GPL(ide_device_add_all);
int ide_device_add(u8 idx[4], const struct ide_port_info *d)
{
u8 idx_all[MAX_HWIFS];
int i;
for (i = 0; i < MAX_HWIFS; i++)
idx_all[i] = (i < 4) ? idx[i] : 0xff;
return ide_device_add_all(idx_all, d);
}
EXPORT_SYMBOL_GPL(ide_device_add);
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