[PATCH 10/12] via82cxxx: add "pci_clock=" parameter

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

Add "pci_clock=" parameter for specifying PCI bus clock frequency (in MHz).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
 drivers/ide/pci/via82cxxx.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Index: b/drivers/ide/pci/via82cxxx.c
===================================================================
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -94,6 +94,8 @@ static struct via_isa_bridge {
 	{ NULL }
 };
 
+static int pci_clock;
+
 static unsigned int via_clock;
 static char *via_dma[] = { "16", "25", "33", "44", "66", "100", "133" };
 
@@ -340,7 +342,7 @@ static unsigned int __devinit init_chips
 	 * Determine system bus clock.
 	 */
 
-	via_clock = system_bus_clock() * 1000;
+	via_clock = (pci_clock ? pci_clock : system_bus_clock()) * 1000;
 
 	switch (via_clock) {
 		case 33000: via_clock = 33333; break;
@@ -495,6 +497,9 @@ static int __init via_ide_init(void)
 
 module_init(via_ide_init);
 
+module_param(pci_clock, int, 0);
+MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
+
 MODULE_AUTHOR("Vojtech Pavlik, Michel Aubry, Jeff Garzik, Andre Hedrick");
 MODULE_DESCRIPTION("PCI driver module for VIA IDE");
 MODULE_LICENSE("GPL");