mxs: Add MX23 quirks into the clock code

[oweals/u-boot.git] / arch / arm / cpu / arm926ejs / mx25 / timer.c

diff --git a/arch/arm/cpu/arm926ejs/mx25/timer.c b/arch/arm/cpu/arm926ejs/mx25/timer.c
index 11d41a8bf9f5b44ec098c18e4b62911f66cc1115..4dc4041c08dd15008bee089720e4d2c3c81489e4 100644 (file)
--- a/arch/arm/cpu/arm926ejs/mx25/timer.c
+++ b/arch/arm/cpu/arm926ejs/mx25/timer.c
@@ -15,7 +15,7 @@
  *
  * (C) Copyright 2009 DENX Software Engineering
  * Author: John Rigby <jrigby@gmail.com>
- *     Add support for MX25
+ *     Add support for MX25
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -40,9 +40,12 @@
 #include <div64.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/arch/clock.h>
 
-static ulong timestamp;
-static ulong lastinc;
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp      (gd->tbl)
+#define lastinc                (gd->lastinc)
 
 /*
  * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
@@ -53,28 +56,27 @@ static ulong lastinc;
 static inline unsigned long long tick_to_time(unsigned long long tick)
 {
        tick *= CONFIG_SYS_HZ;
-       do_div(tick, CONFIG_MX25_CLK32);
+       do_div(tick, MXC_CLK32);
        return tick;
 }
 
 static inline unsigned long long time_to_tick(unsigned long long time)
 {
-       time *= CONFIG_MX25_CLK32;
+       time *= MXC_CLK32;
        do_div(time, CONFIG_SYS_HZ);
        return time;
 }
 
 static inline unsigned long long us_to_tick(unsigned long long us)
 {
-       us = us * CONFIG_MX25_CLK32 + 999999;
+       us = us * MXC_CLK32 + 999999;
        do_div(us, 1000000);
        return us;
 }
 #else
 /* ~2% error */
-#define TICK_PER_TIME  ((CONFIG_MX25_CLK32 + CONFIG_SYS_HZ / 2) / \
-               CONFIG_SYS_HZ)
-#define US_PER_TICK    (1000000 / CONFIG_MX25_CLK32)
+#define TICK_PER_TIME  ((MXC_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ)
+#define US_PER_TICK    (1000000 / MXC_CLK32)
 
 static inline unsigned long long tick_to_time(unsigned long long tick)
 {
@@ -119,21 +121,7 @@ int timer_init(void)
        return 0;
 }
 
-void reset_timer_masked(void)
-{
-       struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
-       /* reset time */
-       /* capture current incrementer value time */
-       lastinc = readl(&gpt->counter);
-       timestamp = 0; /* start "advancing" time stamp from 0 */
-}
-
-void reset_timer(void)
-{
-       reset_timer_masked();
-}
-
-unsigned long long get_ticks (void)
+unsigned long long get_ticks(void)
 {
        struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE;
        ulong now = readl(&gpt->counter); /* current tick value */
@@ -152,29 +140,24 @@ unsigned long long get_ticks (void)
        return timestamp;
 }
 
-ulong get_timer_masked (void)
+ulong get_timer_masked(void)
 {
        /*
         * get_ticks() returns a long long (64 bit), it wraps in
-        * 2^64 / CONFIG_MX25_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
+        * 2^64 / MXC_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~
         * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
         * 5 * 10^6 days - long enough.
         */
        return tick_to_time(get_ticks());
 }
 
-ulong get_timer (ulong base)
+ulong get_timer(ulong base)
 {
-       return get_timer_masked () - base;
-}
-
-void set_timer (ulong t)
-{
-       timestamp = time_to_tick(t);
+       return get_timer_masked() - base;
 }
 
 /* delay x useconds AND preserve advance timstamp value */
-void __udelay (unsigned long usec)
+void __udelay(unsigned long usec)
 {
        unsigned long long tmp;
        ulong tmo;
@@ -185,3 +168,15 @@ void __udelay (unsigned long usec)
        while (get_ticks() < tmp)       /* loop till event */
                 /*NOP*/;
 }
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+       ulong tbclk;
+
+       tbclk = MXC_CLK32;
+       return tbclk;
+}