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-rw-r--r--lib_sh/time.c55
1 files changed, 36 insertions, 19 deletions
diff --git a/lib_sh/time.c b/lib_sh/time.c
index 8fccce3..52dbcd0 100644
--- a/lib_sh/time.c
+++ b/lib_sh/time.c
@@ -1,4 +1,7 @@
/*
+ * (C) Copyright 2009
+ * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
* (C) Copyright 2007-2008
* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
@@ -25,11 +28,30 @@
*/
#include <common.h>
+#include <div64.h>
#include <asm/processor.h>
+#include <asm/clk.h>
#include <asm/io.h>
#define TMU_MAX_COUNTER (~0UL)
-static int clk_adj = 1;
+
+static ulong timer_freq;
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+ tick *= CONFIG_SYS_HZ;
+ do_div(tick, timer_freq);
+
+ return tick;
+}
+
+static inline unsigned long long usec_to_tick(unsigned long long usec)
+{
+ usec *= timer_freq;
+ do_div(usec, 1000000);
+
+ return usec;
+}
static void tmu_timer_start (unsigned int timer)
{
@@ -47,10 +69,10 @@ static void tmu_timer_stop (unsigned int timer)
int timer_init (void)
{
- /* Divide clock by TMU_CLK_DIVIDER */
+ /* Divide clock by CONFIG_SYS_TMU_CLK_DIV */
u16 bit = 0;
- switch (TMU_CLK_DIVIDER) {
+ switch (CONFIG_SYS_TMU_CLK_DIV) {
case 1024:
bit = 4;
break;
@@ -65,15 +87,12 @@ int timer_init (void)
break;
case 4:
default:
- bit = 0;
break;
}
writew(readw(TCR0) | bit, TCR0);
- /* Clock adjustment calc */
- clk_adj = (int)(1.0 / ((1.0 / CONFIG_SYS_HZ) * 1000000));
- if (clk_adj < 1)
- clk_adj = 1;
+ /* Calc clock rate */
+ timer_freq = get_tmu0_clk_rate() >> ((bit + 1) * 2);
tmu_timer_stop(0);
tmu_timer_start(0);
@@ -86,24 +105,22 @@ unsigned long long get_ticks (void)
return 0 - readl(TCNT0);
}
-static unsigned long get_usec (void)
-{
- return (0 - readl(TCNT0));
-}
-
void udelay (unsigned long usec)
{
- unsigned int start = get_usec();
- unsigned int end = start + (usec * clk_adj);
+ unsigned long long tmp;
+ ulong tmo;
+
+ tmo = usec_to_tick(usec);
+ tmp = get_ticks() + tmo; /* get current timestamp */
- while (get_usec() < end)
- continue;
+ while (get_ticks() < tmp) /* loop till event */
+ /*NOP*/;
}
unsigned long get_timer (unsigned long base)
{
/* return msec */
- return ((get_usec() / clk_adj) / 1000) - base;
+ return tick_to_time(get_ticks()) - base;
}
void set_timer (unsigned long t)
@@ -120,5 +137,5 @@ void reset_timer (void)
unsigned long get_tbclk (void)
{
- return CONFIG_SYS_HZ;
+ return timer_freq;
}