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linux/drivers/ide/ide-probe.c
Bartlomiej Zolnierkiewicz 5880b5de71 ide: don't enable IORDY at a probe time 
* Add 'unsigned long port_flags' field to ide_hwif_t.

* Add IDE_PFLAG_PROBING port flag and keep it set during probing.

* Fix ide_pio_need_iordy() to not enable IORDY at a probe time
  (IORDY may lead to controller lock up on certain controllers
   if the port is not occupied).

Loosely based on the recent libata's fix by Tejun, thanks to Alan
for the hint that IDE may also need it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-06-15 18:52:54 +02:00

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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)
{
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
*
* 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)
{
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 */
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_IDX)
/* 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;
if (ide_busy_sleep(drive, timeout, use_altstatus))
return 1;
/* wait for IRQ and ATA_DRQ */
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);
if (rc)
/* failed: try again */
rc = ide_dev_read_id(drive, cmd, id);
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);
}
/* 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, hwif->name);
hwif->gendev.driver_data = 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, 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);
rc = ide_port_wait_ready(hwif);
if (rc == -ENODEV) {
printk(KERN_INFO "%s: no devices on the port\n", hwif->name);
goto out;
} else if (rc == -EBUSY)
printk(KERN_ERR "%s: not ready before the probe\n", hwif->name);
else
rc = -ENODEV;
/*
* 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;
}
out:
/*
* 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_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 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;
}
/*
* 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 (io_ports->ctl_addr)
hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
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)
{
ide_drive_t *drive;
unsigned int i;
ide_port_for_each_present_dev(i, drive, hwif) {
struct device *dev = &drive->gendev;
int ret;
dev_set_name(dev, "%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)
{
const struct ide_port_ops *port_ops = hwif->port_ops;
ide_drive_t *drive;
int i;
ide_port_for_each_dev(i, drive, hwif) {
drive->dn = i + hwif->channel * 2;
if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
drive->io_32bit = 1;
if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
drive->dev_flags |= IDE_DFLAG_UNMASK;
if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
if (port_ops && port_ops->init_dev)
port_ops->init_dev(drive);
}
ide_port_for_each_dev(i, drive, hwif) {
/*
* default to PIO Mode 0 before we figure out
* the most suited mode for the attached device
*/
if (port_ops && port_ops->set_pio_mode)
port_ops->set_pio_mode(drive, 0);
}
}
static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
const struct ide_port_info *d)
{
hwif->channel = port;
hwif->chipset = d->chipset ? d->chipset : ide_pci;
if (d->init_iops)
d->init_iops(hwif);
/* ->host_flags may be set by ->init_iops (or even earlier...) */
hwif->host_flags |= d->host_flags;
hwif->pio_mask = d->pio_mask;
if (d->tp_ops)
hwif->tp_ops = d->tp_ops;
/* ->set_pio_mode for DTC2278 is currently limited to port 0 */
if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
hwif->port_ops = d->port_ops;
hwif->swdma_mask = d->swdma_mask;
hwif->mwdma_mask = d->mwdma_mask;
hwif->ultra_mask = d->udma_mask;
if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
int rc;
hwif->dma_ops = d->dma_ops;
if (d->init_dma)
rc = d->init_dma(hwif, d);
else
rc = ide_hwif_setup_dma(hwif, d);
if (rc < 0) {
printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
hwif->dma_ops = NULL;
hwif->dma_base = 0;
hwif->swdma_mask = 0;
hwif->mwdma_mask = 0;
hwif->ultra_mask = 0;
}
}
if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
if (d->max_sectors)
hwif->rqsize = d->max_sectors;
else {
if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
(hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
hwif->rqsize = 256;
else
hwif->rqsize = 65536;
}
/* call chipset specific routine for each enabled port */
if (d->init_hwif)
d->init_hwif(hwif);
}
static void ide_port_cable_detect(ide_hwif_t *hwif)
{
const struct ide_port_ops *port_ops = hwif->port_ops;
if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
if (hwif->cbl != ATA_CBL_PATA40_SHORT)
hwif->cbl = port_ops->cable_detect(hwif);
}
}
static const u8 ide_hwif_to_major[] =
{ IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
static void ide_port_init_devices_data(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i;
ide_port_for_each_dev(i, drive, hwif) {
u8 j = (hwif->index * MAX_DRIVES) + i;
u16 *saved_id = drive->id;
memset(drive, 0, sizeof(*drive));
memset(saved_id, 0, SECTOR_SIZE);
drive->id = saved_id;
drive->media = ide_disk;
drive->select = (i << 4) | ATA_DEVICE_OBS;
drive->hwif = hwif;
drive->ready_stat = ATA_DRDY;
drive->bad_wstat = BAD_W_STAT;
drive->special_flags = IDE_SFLAG_RECALIBRATE |
IDE_SFLAG_SET_GEOMETRY;
drive->name[0] = 'h';
drive->name[1] = 'd';
drive->name[2] = 'a' + j;
drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
INIT_LIST_HEAD(&drive->list);
init_completion(&drive->gendev_rel_comp);
}
}
static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
{
/* fill in any non-zero initial values */
hwif->index = index;
hwif->major = ide_hwif_to_major[index];
hwif->name[0] = 'i';
hwif->name[1] = 'd';
hwif->name[2] = 'e';
hwif->name[3] = '0' + index;
spin_lock_init(&hwif->lock);
init_timer(&hwif->timer);
hwif->timer.function = &ide_timer_expiry;
hwif->timer.data = (unsigned long)hwif;
init_completion(&hwif->gendev_rel_comp);
hwif->tp_ops = &default_tp_ops;
ide_port_init_devices_data(hwif);
}
static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
{
memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
hwif->irq = hw->irq;
hwif->dev = hw->dev;
hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
hwif->ack_intr = hw->ack_intr;
hwif->config_data = hw->config;
}
static unsigned int ide_indexes;
/**
* ide_find_port_slot - find free port slot
* @d: IDE port info
*
* Return the new port slot index or -ENOENT if we are out of free slots.
*/
static int ide_find_port_slot(const struct ide_port_info *d)
{
int idx = -ENOENT;
u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
/*
* Claim an unassigned slot.
*
* Give preference to claiming other slots before claiming ide0/ide1,
* just in case there's another interface yet-to-be-scanned
* which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
*
* Unless there is a bootable card that does not use the standard
* ports 0x1f0/0x170 (the ide0/ide1 defaults).
*/
mutex_lock(&ide_cfg_mtx);
if (bootable) {
if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
idx = ffz(ide_indexes | i);
} else {
if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
idx = ffz(ide_indexes | 3);
else if ((ide_indexes & 3) != 3)
idx = ffz(ide_indexes);
}
if (idx >= 0)
ide_indexes |= (1 << idx);
mutex_unlock(&ide_cfg_mtx);
return idx;
}
static void ide_free_port_slot(int idx)
{
mutex_lock(&ide_cfg_mtx);
ide_indexes &= ~(1 << idx);
mutex_unlock(&ide_cfg_mtx);
}
static void ide_port_free_devices(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i;
ide_port_for_each_dev(i, drive, hwif) {
kfree(drive->id);
kfree(drive);
}
}
static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
{
int i;
for (i = 0; i < MAX_DRIVES; i++) {
ide_drive_t *drive;
drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
if (drive == NULL)
goto out_nomem;
/*
* 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_node(SECTOR_SIZE, GFP_KERNEL, node);
if (drive->id == NULL)
goto out_nomem;
hwif->devices[i] = drive;
}
return 0;
out_nomem:
ide_port_free_devices(hwif);
return -ENOMEM;
}
struct ide_host *ide_host_alloc(const struct ide_port_info *d,
struct ide_hw **hws, unsigned int n_ports)
{
struct ide_host *host;
struct device *dev = hws[0] ? hws[0]->dev : NULL;
int node = dev ? dev_to_node(dev) : -1;
int i;
host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
if (host == NULL)
return NULL;
for (i = 0; i < n_ports; i++) {
ide_hwif_t *hwif;
int idx;
if (hws[i] == NULL)
continue;
hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
if (hwif == NULL)
continue;
if (ide_port_alloc_devices(hwif, node) < 0) {
kfree(hwif);
continue;
}
idx = ide_find_port_slot(d);
if (idx < 0) {
printk(KERN_ERR "%s: no free slot for interface\n",
d ? d->name : "ide");
ide_port_free_devices(hwif);
kfree(hwif);
continue;
}
ide_init_port_data(hwif, idx);
hwif->host = host;
host->ports[i] = hwif;
host->n_ports++;
}
if (host->n_ports == 0) {
kfree(host);
return NULL;
}
host->dev[0] = dev;
if (d) {
host->init_chipset = d->init_chipset;
host->get_lock = d->get_lock;
host->release_lock = d->release_lock;
host->host_flags = d->host_flags;
host->irq_flags = d->irq_flags;
}
return host;
}
EXPORT_SYMBOL_GPL(ide_host_alloc);
static void ide_port_free(ide_hwif_t *hwif)
{
ide_port_free_devices(hwif);
ide_free_port_slot(hwif->index);
kfree(hwif);
}
static void ide_disable_port(ide_hwif_t *hwif)
{
struct ide_host *host = hwif->host;
int i;
printk(KERN_INFO "%s: disabling port\n", hwif->name);
for (i = 0; i < MAX_HOST_PORTS; i++) {
if (host->ports[i] == hwif) {
host->ports[i] = NULL;
host->n_ports--;
}
}
ide_port_free(hwif);
}
int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
struct ide_hw **hws)
{
ide_hwif_t *hwif, *mate = NULL;
int i, j = 0;
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL) {
mate = NULL;
continue;
}
ide_init_port_hw(hwif, hws[i]);
ide_port_apply_params(hwif);
if ((i & 1) && mate) {
hwif->mate = mate;
mate->mate = hwif;
}
mate = (i & 1) ? NULL : hwif;
ide_init_port(hwif, i & 1, d);
ide_port_cable_detect(hwif);
hwif->port_flags |= IDE_PFLAG_PROBING;
ide_port_init_devices(hwif);
}
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL)
continue;
if (ide_probe_port(hwif) == 0)
hwif->present = 1;
hwif->port_flags &= ~IDE_PFLAG_PROBING;
if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
hwif->mate == NULL || hwif->mate->present == 0) {
if (ide_register_port(hwif)) {
ide_disable_port(hwif);
continue;
}
}
if (hwif->present)
ide_port_tune_devices(hwif);
}
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL)
continue;
if (hwif_init(hwif) == 0) {
printk(KERN_INFO "%s: failed to initialize IDE "
"interface\n", hwif->name);
device_unregister(&hwif->gendev);
ide_disable_port(hwif);
continue;
}
if (hwif->present)
if (ide_port_setup_devices(hwif) == 0) {
hwif->present = 0;
continue;
}
j++;
ide_acpi_init_port(hwif);
if (hwif->present)
ide_acpi_port_init_devices(hwif);
}
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL)
continue;
if (hwif->present)
hwif_register_devices(hwif);
}
ide_host_for_each_port(i, hwif, host) {
if (hwif == NULL)
continue;
ide_sysfs_register_port(hwif);
ide_proc_register_port(hwif);
if (hwif->present)
ide_proc_port_register_devices(hwif);
}
return j ? 0 : -1;
}
EXPORT_SYMBOL_GPL(ide_host_register);
int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
unsigned int n_ports, struct ide_host **hostp)
{
struct ide_host *host;
int rc;
host = ide_host_alloc(d, hws, n_ports);
if (host == NULL)
return -ENOMEM;
rc = ide_host_register(host, d, hws);
if (rc) {
ide_host_free(host);
return rc;
}
if (hostp)
*hostp = host;
return 0;
}
EXPORT_SYMBOL_GPL(ide_host_add);
static void __ide_port_unregister_devices(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i;
ide_port_for_each_present_dev(i, drive, hwif) {
device_unregister(&drive->gendev);
wait_for_completion(&drive->gendev_rel_comp);
}
}
void ide_port_unregister_devices(ide_hwif_t *hwif)
{
mutex_lock(&ide_cfg_mtx);
__ide_port_unregister_devices(hwif);
hwif->present = 0;
ide_port_init_devices_data(hwif);
mutex_unlock(&ide_cfg_mtx);
}
EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
/**
* ide_unregister - free an IDE interface
* @hwif: IDE interface
*
* Perform the final unregister of an IDE interface.
*
* Locking:
* The caller must not hold the IDE locks.
*
* It is up to the caller to be sure there is no pending I/O here,
* and that the interface will not be reopened (present/vanishing
* locking isn't yet done BTW).
*/
static void ide_unregister(ide_hwif_t *hwif)
{
BUG_ON(in_interrupt());
BUG_ON(irqs_disabled());
mutex_lock(&ide_cfg_mtx);
if (hwif->present) {
__ide_port_unregister_devices(hwif);
hwif->present = 0;
}
ide_proc_unregister_port(hwif);
free_irq(hwif->irq, hwif);
device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);
/*
* Remove us from the kernel's knowledge
*/
blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
kfree(hwif->sg_table);
unregister_blkdev(hwif->major, hwif->name);
ide_release_dma_engine(hwif);
mutex_unlock(&ide_cfg_mtx);
}
void ide_host_free(struct ide_host *host)
{
ide_hwif_t *hwif;
int i;
ide_host_for_each_port(i, hwif, host) {
if (hwif)
ide_port_free(hwif);
}
kfree(host);
}
EXPORT_SYMBOL_GPL(ide_host_free);
void ide_host_remove(struct ide_host *host)
{
ide_hwif_t *hwif;
int i;
ide_host_for_each_port(i, hwif, host) {
if (hwif)
ide_unregister(hwif);
}
ide_host_free(host);
}
EXPORT_SYMBOL_GPL(ide_host_remove);
void ide_port_scan(ide_hwif_t *hwif)
{
int rc;
ide_port_apply_params(hwif);
ide_port_cable_detect(hwif);
hwif->port_flags |= IDE_PFLAG_PROBING;
ide_port_init_devices(hwif);
rc = ide_probe_port(hwif);
hwif->port_flags &= ~IDE_PFLAG_PROBING;
if (rc < 0)
return;
hwif->present = 1;
ide_port_tune_devices(hwif);
ide_port_setup_devices(hwif);
ide_acpi_port_init_devices(hwif);
hwif_register_devices(hwif);
ide_proc_port_register_devices(hwif);
}
EXPORT_SYMBOL_GPL(ide_port_scan);
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