alim15x3: add ali_fifo_control() helper
Based on libata pata_ali host driver.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index 99c355e..4b47896 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -48,6 +48,19 @@
static u8 chip_is_1543c_e;
static struct pci_dev *isa_dev;
+static void ali_fifo_control(ide_hwif_t *hwif, ide_drive_t *drive, int on)
+{
+ struct pci_dev *pdev = to_pci_dev(hwif->dev);
+ int pio_fifo = 0x54 + hwif->channel;
+ u8 fifo;
+ int shift = 4 * (drive->dn & 1);
+
+ pci_read_config_byte(pdev, pio_fifo, &fifo);
+ fifo &= ~(0x0F << shift);
+ fifo |= (on << shift);
+ pci_write_config_byte(pdev, pio_fifo, fifo);
+}
+
/**
* ali_set_pio_mode - set host controller for PIO mode
* @drive: drive
@@ -64,8 +77,7 @@
int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
unsigned long T = 1000000 / bus_speed; /* PCI clock based */
int port = hwif->channel ? 0x5c : 0x58;
- int portFIFO = hwif->channel ? 0x55 : 0x54;
- u8 cd_dma_fifo = 0, unit = drive->dn & 1;
+ u8 unit = drive->dn & 1;
struct ide_timing t;
ide_timing_compute(drive, XFER_PIO_0 + pio, &t, T, 1);
@@ -79,20 +91,7 @@
/*
* PIO mode => ATA FIFO on, ATAPI FIFO off
*/
- pci_read_config_byte(dev, portFIFO, &cd_dma_fifo);
- if (drive->media==ide_disk) {
- if (unit) {
- pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0x0F) | 0x50);
- } else {
- pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0xF0) | 0x05);
- }
- } else {
- if (unit) {
- pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0x0F);
- } else {
- pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0xF0);
- }
- }
+ ali_fifo_control(hwif, drive, (drive->media == ide_disk) ? 0x05 : 0x00);
pci_write_config_byte(dev, port, t.setup);
pci_write_config_byte(dev, port + unit + 2,
