[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.

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 19bd346951dd0e2073d33e8b5d964b1fc032c7a1..2fffc7bf5d96d87fea8af0a70f25fbf7b950b4a7 100644 (file)
--- 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)