ide: clear bmdma status in ide_intr() for ICHx controllers (revised #4)

[linux-2.6] / drivers / ide / pci / piix.c

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 52cfc2ac22c124bc2030025ff937de9ebb2924ce..af65b0888bbbec3239ca480d509203e0bee88a60 100644 (file)
--- 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:
@@ -438,18 +435,50 @@ 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;