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authorKnut Wohlrab <knut.wohlrab@de.bosch.com>2013-03-04 04:16:02 +0000
committerStefano Babic <sbabic@denx.de>2013-03-20 11:36:11 +0100
commit982a3c410e21f2f7e5fee22c7fd788fc7ef7fdf9 (patch)
treecd2ea4e5f0a36010f09206c07de6dfc62784dcd7 /arch/arm/imx-common
parent40f1daa0b797e9db7413cf477637ba8d31cbb2d7 (diff)
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imx-common: timer: fix 32-bit overflow
The i.MX6 common timer uses the 32-bit variable tbl (time base lower) to record the overflow of the 32-bit counter. I.e. if the counter overflows, the variable tbl does overflow, too. To capture this overflow, use the variable tbu (time base upper), too. Return the combined value of tbl and tbu. lastinc is unused then, remove it. Signed-off-by: Knut Wohlrab <knut.wohlrab@de.bosch.com> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'arch/arm/imx-common')
-rw-r--r--arch/arm/imx-common/timer.c26
1 files changed, 7 insertions, 19 deletions
diff --git a/arch/arm/imx-common/timer.c b/arch/arm/imx-common/timer.c
index ab37d64..1dbc413 100644
--- a/arch/arm/imx-common/timer.c
+++ b/arch/arm/imx-common/timer.c
@@ -48,9 +48,6 @@ static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR;
DECLARE_GLOBAL_DATA_PTR;
-#define timestamp (gd->arch.tbl)
-#define lastinc (gd->arch.lastinc)
-
static inline unsigned long long tick_to_time(unsigned long long tick)
{
tick *= CONFIG_SYS_HZ;
@@ -70,7 +67,6 @@ static inline unsigned long long us_to_tick(unsigned long long usec)
int timer_init(void)
{
int i;
- ulong val;
/* setup GP Timer 1 */
__raw_writel(GPTCR_SWR, &cur_gpt->control);
@@ -85,9 +81,8 @@ int timer_init(void)
i = __raw_readl(&cur_gpt->control);
__raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control);
- val = __raw_readl(&cur_gpt->counter);
- lastinc = val / (MXC_CLK32 / CONFIG_SYS_HZ);
- timestamp = 0;
+ gd->arch.tbl = __raw_readl(&cur_gpt->counter);
+ gd->arch.tbu = 0;
return 0;
}
@@ -96,18 +91,11 @@ unsigned long long get_ticks(void)
{
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;
+ /* increment tbu if tbl has rolled over */
+ if (now < gd->arch.tbl)
+ gd->arch.tbu++;
+ gd->arch.tbl = now;
+ return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
}
ulong get_timer_masked(void)