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pata_hpt37x: Further improvements based on the IDE updates and vendor drivers 

Better DPLL use and calibration

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan Cox 2007-05-25 20:48:55 +01:00 committed by Jeff Garzik
parent c343a83914
commit 960c8a10cb
1 changed files with 11 additions and 16 deletions
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27
drivers/ata/pata_hpt37x.c
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@ -26,7 +26,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_hpt37x"
#define DRV_VERSION "0.6.5"
#define DRV_VERSION "0.6.6"
struct hpt_clock {
u8 xfer_speed;
@ -931,15 +931,6 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
.udma_mask = 0x7f,
.port_ops = &hpt372_port_ops
};
/* HPT371, 372 and friends - UDMA100 at 50MHz clock */
static const struct ata_port_info info_hpt372_50 = {
.sht = &hpt37x_sht,
.flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x3f,
.port_ops = &hpt372_port_ops
};
/* HPT374 - UDMA133 */
static const struct ata_port_info info_hpt374 = {
.sht = &hpt37x_sht,
@ -1098,17 +1089,21 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
* use a 50MHz DPLL by choice
*/
unsigned int f_low, f_high;
int adjust;
int dpll, adjust;
clock_slot = 2;
/* Compute DPLL */
dpll = 2;
if (port->udma_mask & 0xE0)
clock_slot = 3;
dpll = 3;
f_low = (MHz[clock_slot] * chip_table->base) / 192;
f_low = (MHz[clock_slot] * 48) / MHz[dpll];
f_high = f_low + 2;
if (clock_slot > 1)
f_high += 2;
/* Select the DPLL clock. */
pci_write_config_byte(dev, 0x5b, 0x21);
pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
for(adjust = 0; adjust < 8; adjust++) {
if (hpt37x_calibrate_dpll(dev))
@ -1124,12 +1119,12 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
printk(KERN_WARNING "hpt37x: DPLL did not stabilize.\n");
return -ENODEV;
}
if (clock_slot == 3)
if (dpll == 3)
private_data = (void *)hpt37x_timings_66;
else
private_data = (void *)hpt37x_timings_50;
printk(KERN_INFO "hpt37x: Bus clock %dMHz, using DPLL.\n", MHz[clock_slot]);
printk(KERN_INFO "hpt37x: Bus clock %dMHz, using DPLL.\n", MHz[dpll]);
} else {
private_data = (void *)chip_table->clocks[clock_slot];
/*