[PATCH 8/12] cy82c693: 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/cy82c693.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Index: b/drivers/ide/pci/cy82c693.c
===================================================================
--- a/drivers/ide/pci/cy82c693.c
+++ b/drivers/ide/pci/cy82c693.c
@@ -98,6 +98,8 @@
 #define CY82C963_MIN_BUS_SPEED	25
 #define CY82C963_MAX_BUS_SPEED	33
 
+static int pci_clock;
+
 /* the struct for the PIO mode timings */
 typedef struct pio_clocks_s {
 	u8	address_time;	/* Address setup (clocks) */
@@ -136,7 +138,7 @@ static int calc_clk(int time, int bus_sp
 static void compute_clocks(u8 pio, pio_clocks_t *p_pclk)
 {
 	int clk1, clk2;
-	int bus_speed = system_bus_clock();	/* get speed of PCI bus */
+	int bus_speed = pci_clock ? pci_clock : system_bus_clock();
 
 	/* we don't check against CY82C693's min and max speed,
 	 * so you can play with the idebus=xx parameter
@@ -447,6 +449,9 @@ static int __init cy82c693_ide_init(void
 
 module_init(cy82c693_ide_init);
 
+module_param(pci_clock, int, 0);
+MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
+
 MODULE_AUTHOR("Andreas Krebs, Andre Hedrick");
 MODULE_DESCRIPTION("PCI driver module for the Cypress CY82C693 IDE");
 MODULE_LICENSE("GPL");