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authorStefano Babic <sbabic@denx.de>2012-02-06 12:52:36 +0100
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-02-27 21:19:23 +0100
commit782bb0d236840e1f3c2701119341b5b9412d55cf (patch)
tree0353d613a1e94d0b98a21e2dcf07dcf3f1758256 /arch
parent60ebcffbf1e2a5def29398a9400b423cb1e00976 (diff)
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MX5/MX6: add missing get_ticks() and get_tbclk()
commit f31a911fe (arm, post: add missing post_time_ms for arm) enables get_ticks and get_tbclk for all arm based boards, MX5/MX6 have not yet implemented. Signed-off-by: Stefano Babic <sbabic@denx.de> CC: Dirk Behme <dirk.behme@de.bosch.com> CC: Jason Liu <jason.hui@linaro.org> CC: Marek Vasut <marek.vasut@gmail.com>
Diffstat (limited to 'arch')
-rwxr-xr-xarch/arm/cpu/armv7/imx-common/timer.c75
1 files changed, 57 insertions, 18 deletions
diff --git a/arch/arm/cpu/armv7/imx-common/timer.c b/arch/arm/cpu/armv7/imx-common/timer.c
index 98e9f4a..1645ff8 100755
--- a/arch/arm/cpu/armv7/imx-common/timer.c
+++ b/arch/arm/cpu/armv7/imx-common/timer.c
@@ -25,6 +25,7 @@
#include <common.h>
#include <asm/io.h>
+#include <div64.h>
#include <asm/arch/imx-regs.h>
/* General purpose timers registers */
@@ -50,6 +51,22 @@ DECLARE_GLOBAL_DATA_PTR;
#define timestamp (gd->tbl)
#define lastinc (gd->lastinc)
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+ tick *= CONFIG_SYS_HZ;
+ do_div(tick, CLK_32KHZ);
+
+ return tick;
+}
+
+static inline unsigned long long us_to_tick(unsigned long long usec)
+{
+ usec *= CLK_32KHZ;
+ do_div(usec, 1000000);
+
+ return usec;
+}
+
int timer_init(void)
{
int i;
@@ -75,36 +92,58 @@ int timer_init(void)
return 0;
}
-ulong get_timer_masked(void)
+unsigned long long get_ticks(void)
{
- ulong val = __raw_readl(&cur_gpt->counter);
- val /= (CLK_32KHZ / CONFIG_SYS_HZ);
- if (val >= lastinc)
- timestamp += (val - lastinc);
- else
- timestamp += ((0xFFFFFFFF / (CLK_32KHZ / CONFIG_SYS_HZ))
- - lastinc) + val;
- lastinc = val;
+ ulong now = __raw_readl(&cur_gpt->counter); /* current tick value */
+
+ if (now >= lastinc) {
+ /*
+ * normal mode (non roll)
+ * move stamp forward with absolut diff ticks
+ */
+ timestamp += (now - lastinc);
+ } else {
+ /* we have rollover of incrementer */
+ timestamp += (0xFFFFFFFF - lastinc) + now;
+ }
+ lastinc = now;
return timestamp;
}
+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) ~
+ * 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)
{
return get_timer_masked() - base;
}
-/* delay x useconds AND preserve advance timestamp value */
+/* delay x useconds AND preserve advance timstamp value */
void __udelay(unsigned long usec)
{
- unsigned long now, start, tmo;
- tmo = usec * (CLK_32KHZ / 1000) / 1000;
-
- if (!tmo)
- tmo = 1;
+ unsigned long long tmp;
+ ulong tmo;
- now = start = readl(&cur_gpt->counter);
+ tmo = us_to_tick(usec);
+ tmp = get_ticks() + tmo; /* get current timestamp */
- while ((now - start) < tmo)
- now = readl(&cur_gpt->counter);
+ 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)
+{
+ return CLK_32KHZ;
}