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

Currently, orion5x uses a hardcoded timer tick rate of 166 MHz, but
the actual timer tick rate varies between different members of the SoC
family (and can vary based on strap pin settings).

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

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

1 files changed, 16 insertions, 5 deletions

diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index 83367265bcf6..8a8b089b8b74 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -146,7 +146,6 @@ void __init orion5x_ehci1_init(void)
  ****************************************************************************/
 struct mv643xx_eth_shared_platform_data orion5x_eth_shared_data = {
         .dram           = &orion5x_mbus_dram_info,
-        .t_clk          = ORION5X_TCLK,
 };
 
 static struct resource orion5x_eth_shared_resources[] = {
@@ -282,7 +281,7 @@ static struct plat_serial8250_port orion5x_uart0_data[] = {
                 .flags          = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = ORION5X_TCLK,
+                .uartclk        = 0,
         }, {
         },
 };
@@ -326,7 +325,7 @@ static struct plat_serial8250_port orion5x_uart1_data[] = {
                 .flags          = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = ORION5X_TCLK,
+                .uartclk        = 0,
         }, {
         },
 };
@@ -459,9 +458,17 @@ void __init orion5x_xor_init(void)
 /*****************************************************************************
  * Time handling
  ****************************************************************************/
+int orion5x_tclk;
+
+int __init orion5x_find_tclk(void)
+{
+        return 166666667;
+}
+
 static void orion5x_timer_init(void)
 {
-        orion_time_init(IRQ_ORION5X_BRIDGE, ORION5X_TCLK);
+        orion5x_tclk = orion5x_find_tclk();
+        orion_time_init(IRQ_ORION5X_BRIDGE, orion5x_tclk);
 }
 
 struct sys_timer orion5x_timer = {
@@ -514,7 +521,11 @@ void __init orion5x_init(void)
         u32 dev, rev;
 
         orion5x_id(&dev, &rev, &dev_name);
-        printk(KERN_INFO "Orion ID: %s. TCLK=%d.\n", dev_name, ORION5X_TCLK);
+        printk(KERN_INFO "Orion ID: %s. TCLK=%d.\n", dev_name, orion5x_tclk);
+
+        orion5x_eth_shared_data.t_clk = orion5x_tclk;
+        orion5x_uart0_data[0].uartclk = orion5x_tclk;
+        orion5x_uart1_data[0].uartclk = orion5x_tclk;
 
         /*
          * Setup Orion address map