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-rw-r--r--drivers/ata/libata-acpi.c38
-rw-r--r--include/linux/libata.h6
2 files changed, 44 insertions, 0 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 43af2e06d44..dc9842ec6f0 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -297,6 +297,44 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
}
/**
+ * ata_acpi_cbl_80wire - Check for 80 wire cable
+ * @ap: Port to check
+ *
+ * Return 1 if the ACPI mode data for this port indicates the BIOS selected
+ * an 80wire mode.
+ */
+
+int ata_acpi_cbl_80wire(struct ata_port *ap)
+{
+ struct ata_acpi_gtm gtm;
+ int valid = 0;
+
+ /* No _GTM data, no information */
+ if (ata_acpi_gtm(ap, &gtm) < 0)
+ return 0;
+
+ /* Split timing, DMA enabled */
+ if ((gtm.flags & 0x11) == 0x11 && gtm.drive[0].dma < 55)
+ valid |= 1;
+ if ((gtm.flags & 0x14) == 0x14 && gtm.drive[1].dma < 55)
+ valid |= 2;
+ /* Shared timing, DMA enabled */
+ if ((gtm.flags & 0x11) == 0x01 && gtm.drive[0].dma < 55)
+ valid |= 1;
+ if ((gtm.flags & 0x14) == 0x04 && gtm.drive[0].dma < 55)
+ valid |= 2;
+
+ /* Drive check */
+ if ((valid & 1) && ata_dev_enabled(&ap->link.device[0]))
+ return 1;
+ if ((valid & 2) && ata_dev_enabled(&ap->link.device[1]))
+ return 1;
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
+
+/**
* taskfile_load_raw - send taskfile registers to host controller
* @dev: target ATA device
* @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9295cd541ff..382898ef654 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -885,6 +885,12 @@ enum {
ATA_TIMING_CYCLE | ATA_TIMING_UDMA,
};
+/* libata-acpi.c */
+#ifdef CONFIG_ATA_ACPI
+extern int ata_acpi_cbl_80wire(struct ata_port *ap);
+#else
+static inline int ata_acpi_cbl_80wire(struct ata_port *ap) { return 0; }
+#endif
#ifdef CONFIG_PCI
struct pci_bits {