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path: root/drivers/ide/pci/piix.c
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Diffstat (limited to 'drivers/ide/pci/piix.c')
-rw-r--r--drivers/ide/pci/piix.c63
1 files changed, 48 insertions, 15 deletions
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 52cfc2ac22c..af65b0888bb 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -410,17 +410,14 @@ fast_ata_pio:
}
/**
- * init_chipset_piix - set up the PIIX chipset
- * @dev: PCI device to set up
- * @name: Name of the device
+ * piix_is_ichx - check if ICHx
+ * @dev: PCI device to check
*
- * Initialize the PCI device as required. For the PIIX this turns
- * out to be nice and simple
+ * returns 1 if ICHx, 0 otherwise.
*/
-
-static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char *name)
+static int piix_is_ichx(struct pci_dev *dev)
{
- switch(dev->device) {
+ switch (dev->device) {
case PCI_DEVICE_ID_INTEL_82801EB_1:
case PCI_DEVICE_ID_INTEL_82801AA_1:
case PCI_DEVICE_ID_INTEL_82801AB_1:
@@ -438,19 +435,51 @@ static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char
case PCI_DEVICE_ID_INTEL_ICH7_21:
case PCI_DEVICE_ID_INTEL_ESB2_18:
case PCI_DEVICE_ID_INTEL_ICH8_6:
- {
- unsigned int extra = 0;
- pci_read_config_dword(dev, 0x54, &extra);
- pci_write_config_dword(dev, 0x54, extra|0x400);
- }
- default:
- break;
+ return 1;
}
return 0;
}
/**
+ * init_chipset_piix - set up the PIIX chipset
+ * @dev: PCI device to set up
+ * @name: Name of the device
+ *
+ * Initialize the PCI device as required. For the PIIX this turns
+ * out to be nice and simple
+ */
+
+static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char *name)
+{
+ if (piix_is_ichx(dev)) {
+ unsigned int extra = 0;
+ pci_read_config_dword(dev, 0x54, &extra);
+ pci_write_config_dword(dev, 0x54, extra|0x400);
+ }
+
+ return 0;
+}
+
+/**
+ * piix_dma_clear_irq - clear BMDMA status
+ * @drive: IDE drive to clear
+ *
+ * Called from ide_intr() for PIO interrupts
+ * to clear BMDMA status as needed by ICHx
+ */
+static void piix_dma_clear_irq(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ u8 dma_stat;
+
+ /* clear the INTR & ERROR bits */
+ dma_stat = hwif->INB(hwif->dma_status);
+ /* Should we force the bit as well ? */
+ hwif->OUTB(dma_stat, hwif->dma_status);
+}
+
+/**
* init_hwif_piix - fill in the hwif for the PIIX
* @hwif: IDE interface
*
@@ -486,6 +515,10 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif)
if (!hwif->dma_base)
return;
+ /* ICHx need to clear the bmdma status for all interrupts */
+ if (piix_is_ichx(hwif->pci_dev))
+ hwif->ide_dma_clear_irq = &piix_dma_clear_irq;
+
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x3f;
hwif->mwdma_mask = 0x06;