[libata ahci] Isolate Intel-ism, add JMicron JMB360 support

Isolate some PCI config register bitbanging to Intel hardware, as it
should have been all along.

Add support for JMicron JMB360.

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 19bd346951dd..2fffc7bf5d96 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -286,6 +286,8 @@ static const struct pci_device_id ahci_pci_tbl[] = {
           board_ahci }, /* ICH8M */
         { PCI_VENDOR_ID_INTEL, 0x282a, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
           board_ahci }, /* ICH8M */
+        { 0x197b, 0x2360, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+          board_ahci }, /* JMicron JMB360 */
         { }     /* terminate list */
 };
 
@@ -802,7 +804,6 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
         struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
         void __iomem *mmio = probe_ent->mmio_base;
         u32 tmp, cap_save;
-        u16 tmp16;
         unsigned int i, j, using_dac;
         int rc;
         void __iomem *port_mmio;
@@ -836,9 +837,13 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
         writel(0xf, mmio + HOST_PORTS_IMPL);
         (void) readl(mmio + HOST_PORTS_IMPL);   /* flush */
 
-        pci_read_config_word(pdev, 0x92, &tmp16);
-        tmp16 |= 0xf;
-        pci_write_config_word(pdev, 0x92, tmp16);
+        if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
+                u16 tmp16;
+
+                pci_read_config_word(pdev, 0x92, &tmp16);
+                tmp16 |= 0xf;
+                pci_write_config_word(pdev, 0x92, tmp16);
+        }
 
         hpriv->cap = readl(mmio + HOST_CAP);
         hpriv->port_map = readl(mmio + HOST_PORTS_IMPL);
@@ -1082,6 +1087,10 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         if (have_msi)
                 hpriv->flags |= AHCI_FLAG_MSI;
 
+        /* JMicron-specific fixup: make sure we're in AHCI mode */
+        if (pdev->vendor == 0x197b)
+                pci_write_config_byte(pdev, 0x41, 0xa1);
+
         /* initialize adapter */
         rc = ahci_host_init(probe_ent);
         if (rc)