/*
* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2003 Red Hat
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <linux/nmi.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
void SELECT_MASK(ide_drive_t *drive, int mask)
{
const struct ide_port_ops *port_ops = drive->hwif->port_ops;
if (port_ops && port_ops->maskproc)
port_ops->maskproc(drive, mask);
}
u8 ide_read_error(ide_drive_t *drive)
{
struct ide_taskfile tf;
drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR);
return tf.error;
}
EXPORT_SYMBOL_GPL(ide_read_error);
void ide_fix_driveid(u16 *id)
{
#ifndef __LITTLE_ENDIAN
# ifdef __BIG_ENDIAN
int i;
for (i = 0; i < 256; i++)
id[i] = __le16_to_cpu(id[i]);
# else
# error "Please fix <asm/byteorder.h>"
# endif
#endif
}
/*
* ide_fixstring() cleans up and (optionally) byte-swaps a text string,
* removing leading/trailing blanks and compressing internal blanks.
* It is primarily used to tidy up the model name/number fields as
* returned by the ATA_CMD_ID_ATA[PI] commands.
*/
void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
{
u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
if (byteswap) {
/* convert from big-endian to host byte order */
for (p = s ; p != end ; p += 2)
be16_to_cpus((u16 *) p);
}
/* strip leading blanks */
p = s;
while (s != end && *s == ' ')
++s;
/* compress internal blanks and strip trailing blanks */
while (s != end && *s) {
if (*s++ != ' ' || (s != end && *s && *s != ' '))
*p++ = *(s-1);
}
/* wipe out trailing garbage */
while (p != end)
*p++ = '\0';
}
EXPORT_SYMBOL(ide_fixstring);
/*
* This routine busy-waits for the drive status to be not "busy".
* It then checks the status for all of the "good" bits and none
* of the "bad" bits, and if all is okay it returns 0. All other
* cases return error -- caller may then invoke ide_error().
*
* This routine should get fixed to not hog the cpu during extra long waits..
* That could be done by busy-waiting for the first jiffy or two, and then
* setting a timer to wake up at half second intervals thereafter,
* until timeout is achieved, before timing out.
*/
static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
unsigned long timeout, u8 *rstat)
{
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
unsigned long flags;
int i;
u8 stat;
udelay(1); /* spec allows drive 400ns to assert "BUSY" */
stat = tp_ops->read_status(hwif);
if (stat & ATA_BUSY) {
local_save_flags(flags);
local_irq_enable_in_hardirq();
timeout += jiffies;
while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
if (time_after(jiffies, timeout)) {
/*
* One last read after the timeout in case
* heavy interrupt load made us not make any
* progress during the timeout..
*/
stat = tp_ops->read_status(hwif);
if ((stat & ATA_BUSY) == 0)
break;
local_irq_restore(flags);
*rstat = stat;
return -EBUSY;
}
}
local_irq_restore(flags);
}
/*
* Allow status to settle, then read it again.
* A few rare drives vastly violate the 400ns spec here,
* so we'll wait up to 10usec for a "good" status
* rather than expensively fail things immediately.
* This fix courtesy of Matthew Faupel & Niccolo Rigacci.
*/
for (i = 0; i < 10; i++) {
udelay(1);
stat = tp_ops->read_status(hwif);
if (OK_STAT(stat, good, bad)) {
*rstat = stat;
return 0;
}
}
*rstat = stat;
return -EFAULT;
}
/*
* In case of error returns error value after doing "*startstop = ide_error()".
* The caller should return the updated value of "startstop" in this case,
* "startstop" is unchanged when the function returns 0.
*/
int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good,
u8 bad, unsigned long timeout)
{
int err;
u8 stat;
/* bail early if we've exceeded max_failures */
if (drive->max_failures && (drive->failures > drive->max_failures)) {
*startstop = ide_stopped;
return 1;
}
err = __ide_wait_stat(drive, good, bad, timeout, &stat);
if (err) {
char *s = (err == -EBUSY) ? "status timeout" : "status error";
*startstop = ide_error(drive, s, stat);
}
return err;
}
EXPORT_SYMBOL(ide_wait_stat);
/**
* ide_in_drive_list - look for drive in black/white list
* @id: drive identifier
* @table: list to inspect
*
* Look for a drive in the blacklist and the whitelist tables
* Returns 1 if the drive is found in the table.
*/
int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
{
for ( ; table->id_model; table++)
if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
(!table->id_firmware ||
strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(ide_in_drive_list);
/*
* Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
* Some optical devices with the buggy firmwares have the same problem.
*/
static const struct drive_list_entry ivb_list[] = {
{ "QUANTUM FIREBALLlct10 05" , "A03.0900" },
{ "TSSTcorp CDDVDW SH-S202J" , "SB00" },
{ "TSSTcorp CDDVDW SH-S202J" , "SB01" },
{ "TSSTcorp CDDVDW SH-S202N" , "SB00" },
{ "TSSTcorp CDDVDW SH-S202N" , "SB01" },
{ "TSSTcorp CDDVDW SH-S202H" , "SB00" },
{ "TSSTcorp CDDVDW SH-S202H" , "SB01" },
{ "SAMSUNG SP0822N" , "WA100-10" },
{ NULL , NULL }
};
/*
* All hosts that use the 80c ribbon must use!
* The name is derived from upper byte of word 93 and the 80c ribbon.
*/
u8 eighty_ninty_three(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
u16 *id = drive->id;
int ivb = ide_in_drive_list(id, ivb_list);
if (hwif->cbl == ATA_CBL_PATA40_SHORT)
return 1;
if (ivb)
printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
drive->name);
if (ata_id_is_sata(id) && !ivb)
return 1;
if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
goto no_80w;
/*
* FIXME:
* - change master/slave IDENTIFY order
* - force bit13 (80c cable present) check also for !ivb devices
* (unless the slave device is pre-ATA3)
*/
if (id[ATA_ID_HW_CONFIG] & 0x4000)
return 1;
if (ivb) {
const char *model = (char *)&id[ATA_ID_PROD];
if (strstr(model, "TSSTcorp CDDVDW SH-S202")) {
/*
* These ATAPI devices always report 80c cable
* so we have to depend on the host in this case.
*/
if (hwif->cbl == ATA_CBL_PATA80)
return 1;
} else {
/* Depend on the device side cable detection. */
if (id[ATA_ID_HW_CONFIG] & 0x2000)
return 1;
}
}
no_80w:
if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
return 0;
printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
"limiting max speed to UDMA33\n",
drive->name,
hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;
return 0;
}
int ide_driveid_update(ide_drive_t *drive)
{
u16 *id;
int rc;
id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
if (id == NULL)
return 0;
SELECT_MASK(drive, 1);
rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
SELECT_MASK(drive, 0);
if (rc)
goto out_err;
drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES];
drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES];
/* anything more ? */
kfree(id);
if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
ide_dma_off(drive);
return 1;
out_err:
SELECT_MASK(drive, 0);
if (rc == 2)
printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
kfree(id);
return 0;
}
int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
{
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
struct ide_taskfile tf;
u16 *id = drive->id, i;
int error = 0;
u8 stat;
#ifdef CONFIG_BLK_DEV_IDEDMA
if (hwif->dma_ops) /* check if host supports DMA */
hwif->dma_ops->dma_host_set(drive, 0);
#endif
/* Skip setting PIO flow-control modes on pre-EIDE drives */
if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
goto skip;
/*
* Don't use ide_wait_cmd here - it will
* attempt to set_geometry and recalibrate,
* but for some reason these don't work at
* this point (lost interrupt).
*/
/*
* FIXME: we race against the running IRQ here if
* this is called from non IRQ context. If we use
* disable_irq() we hang on the error path. Work
* is needed.
*/
disable_irq_nosync(hwif->irq);
udelay(1);
tp_ops->dev_select(drive);
SELECT_MASK(drive, 1);
udelay(1);
tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
memset(&tf, 0, sizeof(tf));
tf.feature = SETFEATURES_XFER;
tf.nsect = speed;
tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
if (drive->quirk_list == 2)
tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
error = __ide_wait_stat(drive, drive->ready_stat,
ATA_BUSY | ATA_DRQ | ATA_ERR,
WAIT_CMD, &stat);
SELECT_MASK(drive, 0);
enable_irq(hwif->irq);
if (error) {
(void) ide_dump_status(drive, "set_drive_speed_status", stat);
return error;
}
if (speed >= XFER_SW_DMA_0) {
id[ATA_ID_UDMA_MODES] &= ~0xFF00;
id[ATA_ID_MWDMA_MODES] &= ~0x0700;
id[ATA_ID_SWDMA_MODES] &= ~0x0700;
if (ata_id_is_cfa(id))
id[ATA_ID_CFA_MODES] &= ~0x0E00;
} else if (ata_id_is_cfa(id))
id[ATA_ID_CFA_MODES] &= ~0x01C0;
skip:
#ifdef CONFIG_BLK_DEV_IDEDMA
if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
hwif->dma_ops->dma_host_set(drive, 1);
else if (hwif->dma_ops) /* check if host supports DMA */
ide_dma_off_quietly(drive);
#endif
if (speed >= XFER_UDMA_0) {
i = 1 << (speed - XFER_UDMA_0);
id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
} else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
i = speed - XFER_MW_DMA_2;
id[ATA_ID_CFA_MODES] |= i << 9;
} else if (speed >= XFER_MW_DMA_0) {
i = 1 << (speed - XFER_MW_DMA_0);
id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
} else if (speed >= XFER_SW_DMA_0) {
i = 1 << (speed - XFER_SW_DMA_0);
id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
} else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
i = speed - XFER_PIO_4;
id[ATA_ID_CFA_MODES] |= i << 6;
}
if (!drive->init_speed)
drive->init_speed = speed;
drive->current_speed = speed;
return error;
}
/*
* This should get invoked any time we exit the driver to
* wait for an interrupt response from a drive. handler() points
* at the appropriate code to handle the next interrupt, and a
* timer is started to prevent us from waiting forever in case
* something goes wrong (see the ide_timer_expiry() handler later on).
*
* See also ide_execute_command
*/
void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
unsigned int timeout)
{
ide_hwif_t *hwif = drive->hwif;
BUG_ON(hwif->handler);
hwif->handler = handler;
hwif->timer.expires = jiffies + timeout;
hwif->req_gen_timer = hwif->req_gen;
add_timer(&hwif->timer);
}
void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
unsigned int timeout)
{
ide_hwif_t *hwif = drive->hwif;
unsigned long flags;
spin_lock_irqsave(&hwif->lock, flags);
__ide_set_handler(drive, handler, timeout);
spin_unlock_irqrestore(&hwif->lock, flags);
}
EXPORT_SYMBOL(ide_set_handler);
/**
* ide_execute_command - execute an IDE command
* @drive: IDE drive to issue the command against
* @cmd: command
* @handler: handler for next phase
* @timeout: timeout for command
*
* Helper function to issue an IDE command. This handles the
* atomicity requirements, command timing and ensures that the
* handler and IRQ setup do not race. All IDE command kick off
* should go via this function or do equivalent locking.
*/
void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd,
ide_handler_t *handler, unsigned timeout)
{
ide_hwif_t *hwif = drive->hwif;
unsigned long flags;
spin_lock_irqsave(&hwif->lock, flags);
if ((cmd->protocol != ATAPI_PROT_DMA &&
cmd->protocol != ATAPI_PROT_PIO) ||
(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
__ide_set_handler(drive, handler, timeout);
hwif->tp_ops->exec_command(hwif, cmd->tf.command);
/*
* Drive takes 400nS to respond, we must avoid the IRQ being
* serviced before that.
*
* FIXME: we could skip this delay with care on non shared devices
*/
ndelay(400);
spin_unlock_irqrestore(&hwif->lock, flags);
}
/*
* ide_wait_not_busy() waits for the currently selected device on the hwif
* to report a non-busy status, see comments in ide_probe_port().
*/
int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
{
u8 stat = 0;
while (timeout--) {
/*
* Turn this into a schedule() sleep once I'm sure
* about locking issues (2.5 work ?).
*/
mdelay(1);
stat = hwif->tp_ops->read_status(hwif);
if ((stat & ATA_BUSY) == 0)
return 0;
/*
* Assume a value of 0xff means nothing is connected to
* the interface and it doesn't implement the pull-down
* resistor on D7.
*/
if (stat == 0xff)
return -ENODEV;
touch_softlockup_watchdog();
touch_nmi_watchdog();
}
return -EBUSY;
}
