From e1ddb4b6a2c9b2c72991eb8640ef2f50691ac502 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 16 Aug 2007 02:33:36 -0400 Subject: [PATCH] [libata] add ACPI cable detect API Combined from two Alan Cox patches: 1) libata: ACPI checks for 80wire cable We can use the ACPI mode information with several drivers as a hint to cable type. If the ACPI mode set by the BIOS is faster than UDMA33 then we know the BIOS thinks there are 80wire cables. If it doesn't set such a mode or it has no ACPI method then we get no further information and can rely on existing approaches Introduce the function headers needed. Null it out for non ACPI boxes Signed-off-by: Alan Cox 2) libata: ACPI checks for 80wire cable Provide actual methods for checking if the ACPI support thinks the cable is 80wire, or doesn't know Signed-off-by: Alan Cox Combined into a single changeset and Signed-off-by: Jeff Garzik --- drivers/ata/libata-acpi.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/libata.h | 6 ++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index 43af2e06d4..dc9842ec6f 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -296,6 +296,44 @@ static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf, return rc; } +/** + * 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, >m) < 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 diff --git a/include/linux/libata.h b/include/linux/libata.h index 9295cd541f..382898ef65 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 { -- 2.39.5