[U-Boot] [PATCH] arm1136: timer: Replace bss variable by gd

Heiko Schocher
2010-12-10T08:01:15Z

Reuse the gd->tbl value for timestamp and add gd->lastinc for lastinc bss
values in the arm1136 timer driver for mx31 and omap24xx

The usage of bss values in drivers before initialisation of bss is forbidden.
In that special case some data in .rel.dyn gets corrupted.

This patch is similiar to the patch Dirk Behme posted
for the armv7/omap-common/timer.c

Tested on the mx31 based qong board

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: Albert ARIBAUD <albert.aribaud@free.fr>
---
arch/arm/cpu/arm1136/mx31/timer.c | 19 +++++++++----------
arch/arm/cpu/arm1136/omap24xx/timer.c | 19 +++++++++----------
2 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/arch/arm/cpu/arm1136/mx31/timer.c b/arch/arm/cpu/arm1136/mx31/timer.c
index b8848c4..f6be3b9 100644
--- a/arch/arm/cpu/arm1136/mx31/timer.c
+++ b/arch/arm/cpu/arm1136/mx31/timer.c
@@ -39,8 +39,7 @@
#define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */
#define GPTCR_TEN 1 /* Timer enable */

-static ulong timestamp;
-static ulong lastinc;
+DECLARE_GLOBAL_DATA_PTR;

/* "time" is measured in 1 / CONFIG_SYS_HZ seconds, "tick" is internal timer period */
#ifdef CONFIG_MX31_TIMER_HIGH_PRECISION
@@ -108,8 +107,8 @@ int timer_init (void)
void reset_timer_masked (void)
{
/* reset time */
- lastinc = GPTCNT; /* capture current incrementer value time */
- timestamp = 0; /* start "advancing" time stamp from 0 */
+ gd->lastinc = GPTCNT; /* capture current incrementer value time */
+ gd->tbl = 0; /* start "advancing" time stamp from 0 */
}

void reset_timer(void)
@@ -121,13 +120,13 @@ unsigned long long get_ticks (void)
{
ulong now = GPTCNT; /* current tick value */

- if (now >= lastinc) /* normal mode (non roll) */
+ if (now >= gd->lastinc) /* normal mode (non roll) */
/* move stamp forward with absolut diff ticks */
- timestamp += (now - lastinc);
+ gd->tbl += (now - gd->lastinc);
else /* we have rollover of incrementer */
- timestamp += (0xFFFFFFFF - lastinc) + now;
- lastinc = now;
- return timestamp;
+ gd->tbl += (0xFFFFFFFF - gd->lastinc) + now;
+ gd->lastinc = now;
+ return gd->tbl;
}

ulong get_timer_masked (void)
@@ -148,7 +147,7 @@ ulong get_timer (ulong base)

void set_timer (ulong t)
{
- timestamp = time_to_tick(t);
+ gd->tbl = time_to_tick(t);
}

/* delay x useconds AND preserve advance timestamp value */
diff --git a/arch/arm/cpu/arm1136/omap24xx/timer.c b/arch/arm/cpu/arm1136/omap24xx/timer.c
index 68fe1b2..228ceba 100644
--- a/arch/arm/cpu/arm1136/omap24xx/timer.c
+++ b/arch/arm/cpu/arm1136/omap24xx/timer.c
@@ -39,8 +39,7 @@
/* macro to read the 32 bit timer */
#define READ_TIMER (*((volatile ulong *)(CONFIG_SYS_TIMERBASE+TCRR)))

-static ulong timestamp;
-static ulong lastinc;
+DECLARE_GLOBAL_DATA_PTR;

int timer_init (void)
{
@@ -70,7 +69,7 @@ ulong get_timer (ulong base)

void set_timer (ulong t)
{
- timestamp = t;
+ gd->tbl = t;
}

/* delay x useconds AND preserve advance timestamp value */
@@ -99,20 +98,20 @@ void __udelay (unsigned long usec)
void reset_timer_masked (void)
{
/* reset time */
- lastinc = READ_TIMER; /* capture current incrementer value time */
- timestamp = 0; /* start "advancing" time stamp from 0 */
+ gd->lastinc = READ_TIMER; /* capture current incrementer value time */
+ gd->tbl = 0; /* start "advancing" time stamp from 0 */
}

ulong get_timer_masked (void)
{
ulong now = READ_TIMER; /* current tick value */

- if (now >= lastinc) /* normal mode (non roll) */
- timestamp += (now - lastinc); /* move stamp fordward with absoulte diff ticks */
+ if (now >= gd->lastinc) /* normal mode (non roll) */
+ gd->tbl += (now - gd->lastinc); /* move stamp fordward with absoulte diff ticks */
else /* we have rollover of incrementer */
- timestamp += (0xFFFFFFFF - lastinc) + now;
- lastinc = now;
- return timestamp;
+ gd->tbl += (0xFFFFFFFF - gd->lastinc) + now;
+ gd->lastinc = now;
+ return gd->tbl;
}

/* waits specified delay value and resets timestamp */
--
1.7.2.3