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path: root/drivers/scsi/ata_piix.c
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Diffstat (limited to 'drivers/scsi/ata_piix.c')
-rw-r--r--drivers/scsi/ata_piix.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index 3be54643925..a2cfade2c1c 100644
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -38,6 +38,7 @@ enum {
PIIX_IOCFG = 0x54, /* IDE I/O configuration register */
ICH5_PMR = 0x90, /* port mapping register */
ICH5_PCS = 0x92, /* port control and status */
+ PIIX_SCC = 0x0A, /* sub-class code register */
PIIX_FLAG_AHCI = (1 << 28), /* AHCI possible */
PIIX_FLAG_CHECKINTR = (1 << 29), /* make sure PCI INTx enabled */
@@ -62,6 +63,8 @@ enum {
ich6_sata_rm = 4,
ich7_sata = 5,
esb2_sata = 6,
+
+ PIIX_AHCI_DEVICE = 6,
};
static int piix_init_one (struct pci_dev *pdev,
@@ -574,11 +577,11 @@ static int piix_disable_ahci(struct pci_dev *pdev)
addr = pci_resource_start(pdev, AHCI_PCI_BAR);
if (!addr || !pci_resource_len(pdev, AHCI_PCI_BAR))
return 0;
-
+
mmio = ioremap(addr, 64);
if (!mmio)
return -ENOMEM;
-
+
tmp = readl(mmio + AHCI_GLOBAL_CTL);
if (tmp & AHCI_ENABLE) {
tmp &= ~AHCI_ENABLE;
@@ -588,7 +591,7 @@ static int piix_disable_ahci(struct pci_dev *pdev)
if (tmp & AHCI_ENABLE)
rc = -EIO;
}
-
+
iounmap(mmio);
return rc;
}
@@ -626,9 +629,13 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
port_info[1] = NULL;
if (port_info[0]->host_flags & PIIX_FLAG_AHCI) {
- int rc = piix_disable_ahci(pdev);
- if (rc)
- return rc;
+ u8 tmp;
+ pci_read_config_byte(pdev, PIIX_SCC, &tmp);
+ if (tmp == PIIX_AHCI_DEVICE) {
+ int rc = piix_disable_ahci(pdev);
+ if (rc)
+ return rc;
+ }
}
if (port_info[0]->host_flags & PIIX_FLAG_COMBINED) {