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>

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index ebc4dfcf2f19..d6697baf243d 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -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