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libata: separate out ata_acpi_gtm_xfermask() from pacpi_discover_modes()

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Finding out matching transfer mode from ACPI GTM values is useful for
other purposes too.  Separate out the function and timing tables from
pata_acpi::pacpi_discover_modes().

Other than checking shared-configuration bit after doing
ata_acpi_gtm() in pacpi_discover_modes() which should be safe, this
patch doesn't introduce any behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-12-18 16:33:03 +09:00
committed by Jeff Garzik
parent 9cde9ed151
commit 7c77fa4d51
3 changed files with 114 additions and 55 deletions
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78
drivers/ata/libata-acpi.c
View File

@@ -441,6 +441,84 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
return rc;
}
/* Welcome to ACPI, bring a bucket */
const unsigned int ata_acpi_pio_cycle[7] = {
600, 383, 240, 180, 120, 100, 80
};
EXPORT_SYMBOL_GPL(ata_acpi_pio_cycle);
const unsigned int ata_acpi_mwdma_cycle[5] = {
480, 150, 120, 100, 80
};
EXPORT_SYMBOL_GPL(ata_acpi_mwdma_cycle);
const unsigned int ata_acpi_udma_cycle[7] = {
120, 80, 60, 45, 30, 20, 15
};
EXPORT_SYMBOL_GPL(ata_acpi_udma_cycle);
/**
* ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
* @dev: target device
* @gtm: GTM parameter to use
*
* Determine xfermask for @dev from @gtm.
*
* LOCKING:
* None.
*
* RETURNS:
* Determined xfermask.
*/
unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
const struct ata_acpi_gtm *gtm)
{
int unit, i;
u32 t;
unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO);
/* we always use the 0 slot for crap hardware */
unit = dev->devno;
if (!(gtm->flags & 0x10))
unit = 0;
/* start by scanning for PIO modes */
for (i = 0; i < 7; i++) {
t = gtm->drive[unit].pio;
if (t <= ata_acpi_pio_cycle[i]) {
mask |= (2 << (ATA_SHIFT_PIO + i)) - 1;
break;
}
}
/* See if we have MWDMA or UDMA data. We don't bother with
* MWDMA if UDMA is available as this means the BIOS set UDMA
* and our error changedown if it works is UDMA to PIO anyway.
*/
if (gtm->flags & (1 << (2 * unit))) {
/* MWDMA */
for (i = 0; i < 5; i++) {
t = gtm->drive[unit].dma;
if (t <= ata_acpi_mwdma_cycle[i]) {
mask |= (2 << (ATA_SHIFT_MWDMA + i)) - 1;
break;
}
}
} else {
/* UDMA */
for (i = 0; i < 7; i++) {
t = gtm->drive[unit].dma;
if (t <= ata_acpi_udma_cycle[i]) {
mask |= (2 << (ATA_SHIFT_UDMA + i)) - 1;
break;
}
}
}
return mask;
}
EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
/**
* ata_acpi_cbl_80wire - Check for 80 wire cable
* @ap: Port to check