cmd64x: use interrupt status from MRDMODE register (take 2)
Fold the parts of the ide_dma_end() methods identical to __ide_dma_end() into a
mere call to it.
Start using faster versions of the ide_dma_end() and ide_dma_test_irq() methods
for the PCI0646U and newer chips that have the duplicate interrupt status bits
in the I/O mapped MRDMODE register, determing what methods to use at the driver
load time. Do some cleanup/renaming in the "old" ide_dma_test_irq() method too.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c
index 24acddf..77f51ab 100644
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -1,5 +1,5 @@
/*
- * linux/drivers/ide/pci/cmd64x.c Version 1.46 Mar 16, 2007
+ * linux/drivers/ide/pci/cmd64x.c Version 1.47 Mar 19, 2007
*
* cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines.
* Due to massive hardware bugs, UltraDMA is only supported
@@ -425,67 +425,80 @@
return -1;
}
-static int cmd64x_alt_dma_status (struct pci_dev *dev)
+static int cmd648_ide_dma_end (ide_drive_t *drive)
{
- switch(dev->device) {
- case PCI_DEVICE_ID_CMD_648:
- case PCI_DEVICE_ID_CMD_649:
- return 1;
- default:
- break;
- }
- return 0;
+ ide_hwif_t *hwif = HWIF(drive);
+ int err = __ide_dma_end(drive);
+ u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
+ MRDMODE_INTR_CH0;
+ u8 mrdmode = inb(hwif->dma_master + 0x01);
+
+ /* clear the interrupt bit */
+ outb(mrdmode | irq_mask, hwif->dma_master + 0x01);
+
+ return err;
}
static int cmd64x_ide_dma_end (ide_drive_t *drive)
{
- u8 dma_stat = 0, dma_cmd = 0;
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
+ int irq_reg = hwif->channel ? ARTTIM23 : CFR;
+ u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
+ CFR_INTR_CH0;
+ u8 irq_stat = 0;
+ int err = __ide_dma_end(drive);
- drive->waiting_for_dma = 0;
- /* read DMA command state */
- dma_cmd = inb(hwif->dma_command);
- /* stop DMA */
- outb(dma_cmd & ~1, hwif->dma_command);
- /* get DMA status */
- dma_stat = inb(hwif->dma_status);
- /* clear the INTR & ERROR bits */
- outb(dma_stat | 6, hwif->dma_status);
- if (cmd64x_alt_dma_status(dev)) {
- u8 dma_intr = 0;
- u8 dma_mask = (hwif->channel) ? ARTTIM23_INTR_CH1 :
- CFR_INTR_CH0;
- u8 dma_reg = (hwif->channel) ? ARTTIM2 : CFR;
- (void) pci_read_config_byte(dev, dma_reg, &dma_intr);
- /* clear the INTR bit */
- (void) pci_write_config_byte(dev, dma_reg, dma_intr|dma_mask);
- }
- /* purge DMA mappings */
- ide_destroy_dmatable(drive);
- /* verify good DMA status */
- return (dma_stat & 7) != 4;
+ (void) pci_read_config_byte(dev, irq_reg, &irq_stat);
+ /* clear the interrupt bit */
+ (void) pci_write_config_byte(dev, irq_reg, irq_stat | irq_mask);
+
+ return err;
+}
+
+static int cmd648_ide_dma_test_irq (ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ u8 irq_mask = hwif->channel ? MRDMODE_INTR_CH1 :
+ MRDMODE_INTR_CH0;
+ u8 dma_stat = inb(hwif->dma_status);
+ u8 mrdmode = inb(hwif->dma_master + 0x01);
+
+#ifdef DEBUG
+ printk("%s: dma_stat: 0x%02x mrdmode: 0x%02x irq_mask: 0x%02x\n",
+ drive->name, dma_stat, mrdmode, irq_mask);
+#endif
+ if (!(mrdmode & irq_mask))
+ return 0;
+
+ /* return 1 if INTR asserted */
+ if (dma_stat & 4)
+ return 1;
+
+ return 0;
}
static int cmd64x_ide_dma_test_irq (ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
- u8 irq_reg = hwif->channel ? ARTTIM23 : CFR;
- u8 irq_stat = 0, mask = hwif->channel ? ARTTIM23_INTR_CH1 : CFR_INTR_CH0;
- u8 dma_stat = inb(hwif->dma_status);
+ int irq_reg = hwif->channel ? ARTTIM23 : CFR;
+ u8 irq_mask = hwif->channel ? ARTTIM23_INTR_CH1 :
+ CFR_INTR_CH0;
+ u8 dma_stat = inb(hwif->dma_status);
+ u8 irq_stat = 0;
(void) pci_read_config_byte(dev, irq_reg, &irq_stat);
#ifdef DEBUG
- printk("%s: dma_stat: 0x%02x irq_stat: 0x%02x mask: 0x%02x\n",
- drive->name, dma_stat, irq_stat, mask);
+ printk("%s: dma_stat: 0x%02x irq_stat: 0x%02x irq_mask: 0x%02x\n",
+ drive->name, dma_stat, irq_stat, irq_mask);
#endif
- if (!(irq_stat & mask))
+ if (!(irq_stat & irq_mask))
return 0;
/* return 1 if INTR asserted */
- if ((dma_stat & 4) == 4)
+ if (dma_stat & 4)
return 1;
return 0;
@@ -645,17 +658,25 @@
if (!(hwif->udma_four))
hwif->udma_four = ata66_cmd64x(hwif);
- if (dev->device == PCI_DEVICE_ID_CMD_646) {
+ switch(dev->device) {
+ case PCI_DEVICE_ID_CMD_648:
+ case PCI_DEVICE_ID_CMD_649:
+ alt_irq_bits:
+ hwif->ide_dma_end = &cmd648_ide_dma_end;
+ hwif->ide_dma_test_irq = &cmd648_ide_dma_test_irq;
+ break;
+ case PCI_DEVICE_ID_CMD_646:
hwif->chipset = ide_cmd646;
if (class_rev == 0x01) {
hwif->ide_dma_end = &cmd646_1_ide_dma_end;
- } else {
- hwif->ide_dma_end = &cmd64x_ide_dma_end;
- hwif->ide_dma_test_irq = &cmd64x_ide_dma_test_irq;
- }
- } else {
- hwif->ide_dma_end = &cmd64x_ide_dma_end;
- hwif->ide_dma_test_irq = &cmd64x_ide_dma_test_irq;
+ break;
+ } else if (class_rev >= 0x03)
+ goto alt_irq_bits;
+ /* fall thru */
+ default:
+ hwif->ide_dma_end = &cmd64x_ide_dma_end;
+ hwif->ide_dma_test_irq = &cmd64x_ide_dma_test_irq;
+ break;
}