[ARM] Kirkwood: prepare for runtime-determined timer tick rate

Currently, kirkwood uses a hardcoded timer tick rate of 166 MHz, but
the actual timer tick rate varies between different members of the SoC
family.

This patch prepares for runtime determination of the timer tick rate.

Signed-off-by: Ronen Shitrit <rshitrit@marvell.com>

arch/arm/mach-kirkwood/common.c

@@ -98,7 +98,6 @@ void __init kirkwood_ehci_init(void)
  * GE00
  ****************************************************************************/
 struct mv643xx_eth_shared_platform_data kirkwood_ge00_shared_data = {
-	.t_clk		= KIRKWOOD_TCLK,
 	.dram		= &kirkwood_mbus_dram_info,
 };
 
@@ -206,7 +205,6 @@ void __init kirkwood_sata_init(struct mv_sata_platform_data *sata_data)
  * SPI
  ****************************************************************************/
 static struct orion_spi_info kirkwood_spi_plat_data = {
-	.tclk		= KIRKWOOD_TCLK,
 };
 
 static struct resource kirkwood_spi_resources[] = {
@@ -244,7 +242,7 @@ static struct plat_serial8250_port kirkwood_uart0_data[] = {
 		.flags		= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF,
 		.iotype		= UPIO_MEM,
 		.regshift	= 2,
-		.uartclk	= KIRKWOOD_TCLK,
+		.uartclk	= 0,
 	}, {
 	},
 };
@@ -288,7 +286,7 @@ static struct plat_serial8250_port kirkwood_uart1_data[] = {
 		.flags		= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF,
 		.iotype		= UPIO_MEM,
 		.regshift	= 2,
-		.uartclk	= KIRKWOOD_TCLK,
+		.uartclk	= 0,
 	}, {
 	},
 };
@@ -530,9 +528,17 @@ void __init kirkwood_xor1_init(void)
 /*****************************************************************************
  * Time handling
  ****************************************************************************/
+int kirkwood_tclk;
+
+int __init kirkwood_find_tclk(void)
+{
+	return 166666667;
+}
+
 static void kirkwood_timer_init(void)
 {
-	orion_time_init(IRQ_KIRKWOOD_BRIDGE, KIRKWOOD_TCLK);
+	kirkwood_tclk = kirkwood_find_tclk();
+	orion_time_init(IRQ_KIRKWOOD_BRIDGE, kirkwood_tclk);
 }
 
 struct sys_timer kirkwood_timer = {
@@ -565,7 +571,11 @@ static int __init is_l2_writethrough(void)
 void __init kirkwood_init(void)
 {
 	printk(KERN_INFO "Kirkwood: %s, TCLK=%d.\n",
-		kirkwood_id(), KIRKWOOD_TCLK);
+		kirkwood_id(), kirkwood_tclk);
+	kirkwood_ge00_shared_data.t_clk = kirkwood_tclk;
+	kirkwood_spi_plat_data.tclk = kirkwood_tclk;
+	kirkwood_uart0_data[0].uartclk = kirkwood_tclk;
+	kirkwood_uart1_data[0].uartclk = kirkwood_tclk;
 
 	kirkwood_setup_cpu_mbus();
 

arch/arm/mach-kirkwood/include/mach/timex.h

@@ -8,4 +8,3 @@
 
 #define CLOCK_TICK_RATE		(100 * HZ)
 
-#define KIRKWOOD_TCLK		166666667