ARM: tegra: enhance timer.c to get IO address from device tree

Modify Tegra's timer code to parse the IO address from device tree,
hence removing the dependency on <mach/iomap.h>. This will allow the
driver to be moved to drivers/clocksource/.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 28 insertions, 4 deletions

diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
index 026bad4ac57a..e4863f3e9ee7 100644
--- a/arch/arm/mach-tegra/timer.c
+++ b/arch/arm/mach-tegra/timer.c
@@ -26,6 +26,7 @@
 #include <linux/clocksource.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/of_address.h>
 #include <linux/of_irq.h>
 
 #include <asm/mach/time.h>
@@ -33,8 +34,6 @@
 #include <asm/sched_clock.h>
 
 #include "board.h"
-#include "clock.h"
-#include "iomap.h"
 
 #define RTC_SECONDS            0x08
 #define RTC_SHADOW_SECONDS     0x0c
@@ -52,8 +51,8 @@
 #define TIMER_PTV 0x0
 #define TIMER_PCR 0x4
 
-static void __iomem *timer_reg_base = IO_ADDRESS(TEGRA_TMR1_BASE);
-static void __iomem *rtc_base = IO_ADDRESS(TEGRA_RTC_BASE);
+static void __iomem *timer_reg_base;
+static void __iomem *rtc_base;
 
 static struct timespec persistent_ts;
 static u64 persistent_ms, last_persistent_ms;
@@ -164,6 +163,11 @@ static const struct of_device_id timer_match[] __initconst = {
         {}
 };
 
+static const struct of_device_id rtc_match[] __initconst = {
+        { .compatible = "nvidia,tegra20-rtc" },
+        {}
+};
+
 static void __init tegra_init_timer(void)
 {
         struct device_node *np;
@@ -177,6 +181,12 @@ static void __init tegra_init_timer(void)
                 BUG();
         }
 
+        timer_reg_base = of_iomap(np, 0);
+        if (!timer_reg_base) {
+                pr_err("Can't map timer registers");
+                BUG();
+        }
+
         tegra_timer_irq.irq = irq_of_parse_and_map(np, 2);
         if (tegra_timer_irq.irq <= 0) {
                 pr_err("Failed to map timer IRQ\n");
@@ -192,6 +202,20 @@ static void __init tegra_init_timer(void)
                 rate = clk_get_rate(clk);
         }
 
+        of_node_put(np);
+
+        np = of_find_matching_node(NULL, rtc_match);
+        if (!np) {
+                pr_err("Failed to find RTC DT node\n");
+                BUG();
+        }
+
+        rtc_base = of_iomap(np, 0);
+        if (!rtc_base) {
+                pr_err("Can't map RTC registers");
+                BUG();
+        }
+
         /*
          * rtc registers are used by read_persistent_clock, keep the rtc clock
          * enabled