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ide-probe.c
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ide-probe.c
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/*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
*/
/*
* Mostly written by Mark Lord <[email protected]>
* and Gadi Oxman <[email protected]>
* and Andre Hedrick <[email protected]>
*
* 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)
{
u16 *id = drive->id;
id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
}
static void ide_disk_init_chs(ide_drive_t *drive)
{
u16 *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[ATA_ID_CYLS];
drive->head = drive->bios_head = id[ATA_ID_HEADS];
drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
}
/* Handle logical geometry translation by the drive */
if (ata_id_current_chs_valid(id)) {
drive->cyl = id[ATA_ID_CUR_CYLS];
drive->head = id[ATA_ID_CUR_HEADS];
drive->sect = id[ATA_ID_CUR_SECTORS];
}
/* Use physical geometry if what we have still makes no sense */
if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
drive->cyl = id[ATA_ID_CYLS];
drive->head = id[ATA_ID_HEADS];
drive->sect = id[ATA_ID_SECTORS];
}
}
static void ide_disk_init_mult_count(ide_drive_t *drive)
{
u16 *id = drive->id;
u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
if (max_multsect) {
if ((max_multsect / 2) > 1)
id[ATA_ID_MULTSECT] = max_multsect | 0x100;
else
id[ATA_ID_MULTSECT] &= ~0x1ff;
drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
if (drive->mult_req)
drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
}
}
static void ide_classify_ata_dev(ide_drive_t *drive)
{
u16 *id = drive->id;
char *m = (char *)&id[ATA_ID_PROD];
int is_cfa = ata_id_is_cfa(id);
/* CF devices are *not* removable in Linux definition of the term */
if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
drive->dev_flags |= IDE_DFLAG_REMOVABLE;
drive->media = ide_disk;
if (!ata_id_has_unload(drive->id))
drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
is_cfa ? "CFA" : "ATA");
}
static void ide_classify_atapi_dev(ide_drive_t *drive)
{
u16 *id = drive->id;
char *m = (char *)&id[ATA_ID_PROD];
u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
switch (type) {
case ide_floppy:
if (!strstr(m, "CD-ROM")) {
if (!strstr(m, "oppy") &&
!strstr(m, "poyp") &&
!strstr(m, "ZIP"))
printk(KERN_CONT "cdrom or floppy?, assuming ");
if (drive->media != ide_cdrom) {
printk(KERN_CONT "FLOPPY");
drive->dev_flags |= IDE_DFLAG_REMOVABLE;
break;
}
}
/* Early cdrom models used zero */
type = ide_cdrom;
case ide_cdrom:
drive->dev_flags |= IDE_DFLAG_REMOVABLE;
#ifdef CONFIG_PPC
/* kludge for Apple PowerBook internal zip */
if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
printk(KERN_CONT "FLOPPY");
type = ide_floppy;
break;
}
#endif
printk(KERN_CONT "CD/DVD-ROM");
break;
case ide_tape:
printk(KERN_CONT "TAPE");
break;
case ide_optical:
printk(KERN_CONT "OPTICAL");
drive->dev_flags |= IDE_DFLAG_REMOVABLE;
break;
default:
printk(KERN_CONT "UNKNOWN (type %d)", type);
break;
}
printk(KERN_CONT " drive\n");
drive->media = type;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
if (ata_id_cdb_intr(id))
drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
/* we don't do head unloading on ATAPI devices */
drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
}
/**
* do_identify - identify a drive
* @drive: drive to identify
* @cmd: command used
* @id: buffer for IDENTIFY data
*
* Called when we have issued a drive identify command to
* read and parse the results. This function is run with
* interrupts disabled.
*/
static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
{
ide_hwif_t *hwif = drive->hwif;
char *m = (char *)&id[ATA_ID_PROD];
unsigned long flags;
int bswap = 1;
/* local CPU only; some systems need this */
local_irq_save(flags);
/* read 512 bytes of id info */
hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
local_irq_restore(flags);
drive->dev_flags |= IDE_DFLAG_ID_READ;
#ifdef DEBUG
printk(KERN_INFO "%s: dumping identify data\n", drive->name);
ide_dump_identify((u8 *)id);
#endif
ide_fix_driveid(id);
/*
* ATA_CMD_ID_ATA returns little-endian info,
* ATA_CMD_ID_ATAPI *usually* returns little-endian info.
*/
if (cmd == ATA_CMD_ID_ATAPI) {
if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
(m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
(m[0] == 'P' && m[1] == 'i')) /* Pioneer */
/* Vertos drives may still be weird */
bswap ^= 1;
}
ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
/* we depend on this a lot! */
m[ATA_ID_PROD_LEN - 1] = '\0';
if (strstr(m, "E X A B Y T E N E S T"))
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
else
drive->dev_flags |= IDE_DFLAG_PRESENT;
}
/**
* ide_dev_read_id - send ATA/ATAPI IDENTIFY command
* @drive: drive to identify
* @cmd: command to use
* @id: buffer for IDENTIFY data
* @irq_ctx: flag set when called from the IRQ context
*
* Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
*
* Returns: 0 device was identified
* 1 device timed-out (no response to identify request)
* 2 device aborted the command (refused to identify itself)
*/
int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_io_ports *io_ports = &hwif->io_ports;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
int use_altstatus = 0, rc;
unsigned long timeout;
u8 s = 0, a = 0;
/*
* Disable device IRQ. Otherwise we'll get spurious interrupts
* during the identify phase that the IRQ handler isn't expecting.
*/
if (io_ports->ctl_addr)
tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
/* take a deep breath */
if (irq_ctx)
mdelay(50);
else
msleep(50);
if (io_ports->ctl_addr &&
(hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
a = tp_ops->read_altstatus(hwif);
s = tp_ops->read_status(hwif);
if ((a ^ s) & ~ATA_SENSE)
/* 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 == ATA_CMD_ID_ATAPI) {
struct ide_taskfile tf;
memset(&tf, 0, sizeof(tf));
/* disable DMA & overlap */
tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
}
/* ask drive for ID */
tp_ops->exec_command(hwif, cmd);
timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
/* wait for IRQ and ATA_DRQ */
if (irq_ctx) {
rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
if (rc)
return 1;
} else {
rc = ide_busy_sleep(drive, timeout, use_altstatus);
if (rc)
return 1;
msleep(50);
s = tp_ops->read_status(hwif);
}
if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
/* drive returned ID */
do_identify(drive, cmd, id);
/* drive responded with ID */
rc = 0;
/* clear drive IRQ */
(void)tp_ops->read_status(hwif);
} else {
/* drive refused ID */
rc = 2;
}
return rc;
}
int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
{
ide_hwif_t *hwif = drive->hwif;
u8 stat;
timeout += jiffies;
do {
msleep(50); /* give drive a breather */
stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
: hwif->tp_ops->read_status(hwif);
if ((stat & ATA_BUSY) == 0)
return 0;
} while (time_before(jiffies, timeout));
printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
return 1; /* drive timed-out */
}
static u8 ide_read_device(ide_drive_t *drive)
{
struct ide_taskfile tf;
drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
return tf.device;
}
/**
* 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 = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
u16 *id = drive->id;
int rc;
u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
/* avoid waiting for inappropriate probes */
if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
return 4;
#ifdef DEBUG
printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
drive->name, present, drive->media,
(cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
#endif
/* needed for some systems
* (e.g. crw9624 as drive0 with disk as slave)
*/
msleep(50);
tp_ops->dev_select(drive);
msleep(50);
if (ide_read_device(drive) != drive->select && present == 0) {
if (drive->dn & 1) {
/* exit with drive0 selected */
tp_ops->dev_select(hwif->devices[0]);
/* allow ATA_BUSY to assert & clear */
msleep(50);
}
/* no i/f present: mmm.. this should be a 4 -ml */
return 3;
}
stat = tp_ops->read_status(hwif);
if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
present || cmd == ATA_CMD_ID_ATAPI) {
rc = ide_dev_read_id(drive, cmd, id, 0);
if (rc)
/* failed: try again */
rc = ide_dev_read_id(drive, cmd, id, 0);
stat = tp_ops->read_status(hwif);
if (stat == (ATA_BUSY | ATA_DRDY))
return 4;
if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
printk(KERN_ERR "%s: no response (status = 0x%02x), "
"resetting drive\n", drive->name, stat);
msleep(50);
tp_ops->dev_select(drive);
msleep(50);
tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
(void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
rc = ide_dev_read_id(drive, cmd, id, 0);
}
/* ensure drive IRQ is clear */
stat = tp_ops->read_status(hwif);
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->dn & 1) {
/* exit with drive0 selected */
tp_ops->dev_select(hwif->devices[0]);
msleep(50);
/* ensure drive irq is clear */
(void)tp_ops->read_status(hwif);
}
return rc;
}
/**
* 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: IDE_DFLAG_PRESENT might still be not set)
*/
static u8 probe_for_drive(ide_drive_t *drive)
{
char *m;
int rc;
u8 cmd;
drive->dev_flags &= ~IDE_DFLAG_ID_READ;
m = (char *)&drive->id[ATA_ID_PROD];
strcpy(m, "UNKNOWN");
/* skip probing? */
if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
/* if !(success||timed-out) */
cmd = ATA_CMD_ID_ATA;
rc = do_probe(drive, cmd);
if (rc >= 2) {
/* look for ATAPI device */
cmd = ATA_CMD_ID_ATAPI;
rc = do_probe(drive, cmd);
}
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
return 0;
/* identification failed? */
if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
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->dev_flags &= ~IDE_DFLAG_PRESENT;
}
} else {
if (cmd == ATA_CMD_ID_ATAPI)
ide_classify_atapi_dev(drive);
else
ide_classify_ata_dev(drive);
}
}
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
return 0;
/* The drive wasn't being helpful. Add generic info only */
if ((drive->dev_flags & IDE_DFLAG_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 1;
}
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 int ide_register_port(ide_hwif_t *hwif)
{
int ret;
/* register with global device tree */
dev_set_name(&hwif->gendev, "%s", hwif->name);
dev_set_drvdata(&hwif->gendev, hwif);
if (hwif->gendev.parent == NULL)
hwif->gendev.parent = hwif->dev;
hwif->gendev.release = hwif_release_dev;
ret = device_register(&hwif->gendev);
if (ret < 0) {
printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
__func__, ret);
goto out;
}
hwif->portdev = device_create(ide_port_class, &hwif->gendev,
MKDEV(0, 0), hwif, "%s", hwif->name);
if (IS_ERR(hwif->portdev)) {
ret = PTR_ERR(hwif->portdev);
device_unregister(&hwif->gendev);
}
out:
return 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)
{
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
ide_drive_t *drive;
int i, 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 */
ide_port_for_each_dev(i, drive, hwif) {
/* Ignore disks that we will not probe for later. */
if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
(drive->dev_flags & IDE_DFLAG_PRESENT)) {
tp_ops->dev_select(drive);
tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
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 (i)
tp_ops->dev_select(hwif->devices[0]);
return rc;
}
/**
* ide_undecoded_slave - look for bad CF adapters
* @dev1: slave device
*
* 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 *dev1)
{
ide_drive_t *dev0 = dev1->hwif->devices[0];
if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
return;
/* If the models don't match they are not the same product */
if (strcmp((char *)&dev0->id[ATA_ID_PROD],
(char *)&dev1->id[ATA_ID_PROD]))
return;
/* Serial numbers do not match */
if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
(char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
return;
/* No serial number, thankfully very rare for CF */
if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
return;
/* Appears to be an IDE flash adapter with decode bugs */
printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
}
EXPORT_SYMBOL_GPL(ide_undecoded_slave);
static int ide_probe_port(ide_hwif_t *hwif)
{
ide_drive_t *drive;
unsigned int irqd;
int i, rc = -ENODEV;
BUG_ON(hwif->present);
if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
(hwif->devices[1]->dev_flags & IDE_DFLAG_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);
if (ide_port_wait_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.
*/
ide_port_for_each_dev(i, drive, hwif) {
(void) probe_for_drive(drive);
if (drive->dev_flags & IDE_DFLAG_PRESENT)
rc = 0;
}
/*
* 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)
{
const struct ide_port_ops *port_ops = hwif->port_ops;
ide_drive_t *drive;
int i;
ide_port_for_each_present_dev(i, drive, hwif) {
ide_check_nien_quirk_list(drive);
if (port_ops && port_ops->quirkproc)
port_ops->quirkproc(drive);
}
ide_port_for_each_present_dev(i, drive, hwif) {
ide_set_max_pio(drive);
drive->dev_flags |= IDE_DFLAG_NICE1;
if (hwif->dma_ops)
ide_set_dma(drive);
}
}
/*
* init request queue
*/
static int ide_init_queue(ide_drive_t *drive)
{
struct request_queue *q;
ide_hwif_t *hwif = drive->hwif;
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, NULL, 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_hw_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_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 DEFINE_MUTEX(ide_cfg_mtx);
/*
* For any present drive:
* - allocate the block device queue
*/
static int ide_port_setup_devices(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i, j = 0;
mutex_lock(&ide_cfg_mtx);
ide_port_for_each_present_dev(i, drive, hwif) {
if (ide_init_queue(drive)) {
printk(KERN_ERR "ide: failed to init %s\n",
drive->name);
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
continue;
}
j++;
}
mutex_unlock(&ide_cfg_mtx);
return j;
}
static void ide_host_enable_irqs(struct ide_host *host)
{
ide_hwif_t *hwif;
int i;
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL)
continue;
/* clear any pending IRQs */
hwif->tp_ops->read_status(hwif);
/* unmask IRQs */
if (hwif->io_ports.ctl_addr)
hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
}
}
/*
* This routine sets up the IRQ for an IDE interface.
*/
static int init_irq (ide_hwif_t *hwif)
{
struct ide_io_ports *io_ports = &hwif->io_ports;
struct ide_host *host = hwif->host;
irq_handler_t irq_handler = host->irq_handler;
int sa = host->irq_flags;
if (irq_handler == NULL)
irq_handler = ide_intr;
if (!host->get_lock)
if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
goto out_up;
#if !defined(__mc68000__)
printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
io_ports->data_addr, io_ports->status_addr,
io_ports->ctl_addr, hwif->irq);
#else
printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
io_ports->data_addr, hwif->irq);
#endif /* __mc68000__ */
if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
printk(KERN_CONT " (serialized)");
printk(KERN_CONT "\n");
return 0;
out_up:
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->devices[unit];
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
return NULL;
if (drive->media == ide_disk)
request_module("ide-disk");
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 &disk_to_dev(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->dn & 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 drive_release_dev (struct device *dev)
{
ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
ide_proc_unregister_device(drive);
blk_cleanup_queue(drive->queue);
drive->queue = NULL;
drive->dev_flags &= ~IDE_DFLAG_PRESENT;
complete(&drive->gendev_rel_comp);
}
static int hwif_init(ide_hwif_t *hwif)
{
if (!hwif->irq) {
printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
return 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;
}
sg_init_table(hwif->sg_table, hwif->sg_max_nents);
if (init_irq(hwif)) {
printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
hwif->name, hwif->irq);
goto out;
}
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)