libata: separate out ata_acpi_gtm_xfermask() from pacpi_discover_modes()
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>
diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
index e4542ab..a4737a3 100644
--- a/drivers/ata/pata_acpi.c
+++ b/drivers/ata/pata_acpi.c
@@ -81,17 +81,6 @@
NULL, ata_std_postreset);
}
-/* Welcome to ACPI, bring a bucket */
-static const unsigned int pio_cycle[7] = {
- 600, 383, 240, 180, 120, 100, 80
-};
-static const unsigned int mwdma_cycle[5] = {
- 480, 150, 120, 100, 80
-};
-static const unsigned int udma_cycle[7] = {
- 120, 80, 60, 45, 30, 20, 15
-};
-
/**
* pacpi_discover_modes - filter non ACPI modes
* @adev: ATA device
@@ -103,56 +92,20 @@
static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev)
{
- int unit = adev->devno;
struct pata_acpi *acpi = ap->private_data;
- int i;
- u32 t;
- unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO);
-
struct ata_acpi_gtm probe;
+ unsigned int xfer_mask;
probe = acpi->gtm;
- /* We always use the 0 slot for crap hardware */
- if (!(probe.flags & 0x10))
- unit = 0;
-
ata_acpi_gtm(ap, &probe);
- /* Start by scanning for PIO modes */
- for (i = 0; i < 7; i++) {
- t = probe.drive[unit].pio;
- if (t <= pio_cycle[i]) {
- mask |= (2 << (ATA_SHIFT_PIO + i)) - 1;
- break;
- }
- }
+ xfer_mask = ata_acpi_gtm_xfermask(adev, &probe);
- /* See if we have MWDMA or UDMA data. We don't bother with MWDMA
- if UDMA is availabe as this means the BIOS set UDMA and our
- error changedown if it works is UDMA to PIO anyway */
- if (probe.flags & (1 << (2 * unit))) {
- /* MWDMA */
- for (i = 0; i < 5; i++) {
- t = probe.drive[unit].dma;
- if (t <= mwdma_cycle[i]) {
- mask |= (2 << (ATA_SHIFT_MWDMA + i)) - 1;
- break;
- }
- }
- } else {
- /* UDMA */
- for (i = 0; i < 7; i++) {
- t = probe.drive[unit].dma;
- if (t <= udma_cycle[i]) {
- mask |= (2 << (ATA_SHIFT_UDMA + i)) - 1;
- break;
- }
- }
- }
- if (mask & (0xF8 << ATA_SHIFT_UDMA))
+ if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
ap->cbl = ATA_CBL_PATA80;
- return mask;
+
+ return xfer_mask;
}
/**
@@ -185,7 +138,8 @@
unit = 0;
/* Now stuff the nS values into the structure */
- acpi->gtm.drive[unit].pio = pio_cycle[adev->pio_mode - XFER_PIO_0];
+ acpi->gtm.drive[unit].pio =
+ ata_acpi_pio_cycle[adev->pio_mode - XFER_PIO_0];
ata_acpi_stm(ap, &acpi->gtm);
/* See what mode we actually got */
ata_acpi_gtm(ap, &acpi->gtm);
@@ -207,10 +161,12 @@
/* Now stuff the nS values into the structure */
if (adev->dma_mode >= XFER_UDMA_0) {
- acpi->gtm.drive[unit].dma = udma_cycle[adev->dma_mode - XFER_UDMA_0];
+ acpi->gtm.drive[unit].dma =
+ ata_acpi_udma_cycle[adev->dma_mode - XFER_UDMA_0];
acpi->gtm.flags |= (1 << (2 * unit));
} else {
- acpi->gtm.drive[unit].dma = mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
+ acpi->gtm.drive[unit].dma =
+ ata_acpi_mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0];
acpi->gtm.flags &= ~(1 << (2 * unit));
}
ata_acpi_stm(ap, &acpi->gtm);