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-rw-r--r--lib_sh/time.c83
1 files changed, 66 insertions, 17 deletions
diff --git a/lib_sh/time.c b/lib_sh/time.c
index e637e95a31..2bd7715282 100644
--- a/lib_sh/time.c
+++ b/lib_sh/time.c
@@ -1,6 +1,9 @@
/*
- * Copyright (c) 2007
- * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * (C) Copyright 2007-2008
+ * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
@@ -23,50 +26,96 @@
#include <common.h>
#include <asm/processor.h>
+#include <asm/io.h>
+
+#define TMU_MAX_COUNTER (~0UL)
+static int clk_adj = 1;
static void tmu_timer_start (unsigned int timer)
{
if (timer > 2)
return;
+ writeb(readb(TSTR) | (1 << timer), TSTR);
+}
- *((volatile unsigned char *) TSTR0) |= (1 << timer);
+static void tmu_timer_stop (unsigned int timer)
+{
+ if (timer > 2)
+ return;
+ writeb(readb(TSTR) & ~(1 << timer), TSTR);
}
int timer_init (void)
{
- *(volatile u16 *)TCR0 = 0;
+ /* Divide clock by TMU_CLK_DIVIDER */
+ u16 bit = 0;
+ switch( TMU_CLK_DIVIDER ){
+ case 4:
+ bit = 0;
+ break;
+ case 16:
+ bit = 1;
+ break;
+ case 64: bit = 2;
+ break;
+ case 256:
+ bit = 3;
+ break;
+ case 1024:
+ bit = 4;
+ break;
+ 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;
+
+ tmu_timer_stop(0);
+ tmu_timer_start(0);
- tmu_timer_start (0);
return 0;
}
unsigned long long get_ticks (void)
{
- return (0 - *((volatile unsigned int *) TCNT0));
+ return 0 - readl(TCNT0);
}
-unsigned long get_timer (unsigned long base)
+static unsigned long get_usec (void)
{
- return ((0 - *((volatile unsigned int *) TCNT0)) - base);
+ return (0 - readl(TCNT0));
}
-void set_timer (unsigned long t)
+void udelay (unsigned long usec)
{
- *((volatile unsigned int *) TCNT0) = (0 - t);
+ unsigned int start = get_usec();
+ unsigned int end = start + (usec * clk_adj);
+
+ while (get_usec() < end)
+ continue;
}
-void reset_timer (void)
+unsigned long get_timer (unsigned long base)
{
- set_timer (0);
+ /* return msec */
+ return ((get_usec()/clk_adj)/1000) - base;
}
-void udelay (unsigned long usec)
+void set_timer (unsigned long t)
{
- unsigned int start = get_timer (0);
- unsigned int end = start + (usec * ((CONFIG_SYS_HZ + 500000) / 1000000));
+ writel((0 - t), TCNT0);
+}
- while (get_timer (0) < end)
- continue;
+void reset_timer (void)
+{
+ tmu_timer_stop(0);
+ set_timer (0);
+ tmu_timer_start(0);
}
unsigned long get_tbclk (void)