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arm920t/at91/timer: replace bss variables by gd

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Reuse the gd->tbl value for timestamp and add gd->lastinc for lastinc
bss values in arm920t/at91/timer driver.
The usage of bss values in driver before initialisation of bss is
forbidden. In that special case some data in .rel.dyn gets corrupted by
the arm920t/at91/timer driver.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Andreas Bießmann 2010-11-30 09:45:06 +00:00 committed by Reinhard Meyer
parent 305bf489d1
commit a429db7e3c
3 changed files with 17 additions and 15 deletions
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29
arch/arm/cpu/arm920t/at91/timer.c
View File

@ -32,17 +32,16 @@
#include <common.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_tc.h>
#include <asm/arch/at91_pmc.h>
DECLARE_GLOBAL_DATA_PTR;
/* the number of clocks per CONFIG_SYS_HZ */
#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
static u32 timestamp;
static u32 lastinc;
int timer_init(void)
{
at91_tc_t *tc = (at91_tc_t *) AT91_TC_BASE;
@ -64,8 +63,8 @@ int timer_init(void)
writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
lastinc = 0;
timestamp = 0;
gd->lastinc = 0;
gd->tbl = 0;
return 0;
}
@ -86,7 +85,7 @@ ulong get_timer(ulong base)
void set_timer(ulong t)
{
timestamp = t;
gd->tbl = t;
}
void __udelay(unsigned long usec)
@ -98,8 +97,8 @@ void reset_timer_masked(void)
{
/* reset time */
at91_tc_t *tc = (at91_tc_t *) AT91_TC_BASE;
lastinc = readl(&tc->tc[0].cv) & 0x0000ffff;
timestamp = 0;
gd->lastinc = readl(&tc->tc[0].cv) & 0x0000ffff;
gd->tbl = 0;
}
ulong get_timer_raw(void)
@ -109,16 +108,16 @@ ulong get_timer_raw(void)
now = readl(&tc->tc[0].cv) & 0x0000ffff;
if (now >= lastinc) {
if (now >= gd->lastinc) {
/* normal mode */
timestamp += now - lastinc;
gd->tbl += now - gd->lastinc;
} else {
/* we have an overflow ... */
timestamp += now + TIMER_LOAD_VAL - lastinc;
gd->tbl += now + TIMER_LOAD_VAL - gd->lastinc;
}
lastinc = now;
gd->lastinc = now;
return timestamp;
return gd->tbl;
}
ulong get_timer_masked(void)

1
arch/arm/include/asm/global_data.h
View File

@ -60,6 +60,7 @@ typedef struct global_data {
unsigned long tbl;
unsigned long tbu;
unsigned long long timer_reset_value;
unsigned long lastinc;
#endif
unsigned long relocaddr; /* Start address of U-Boot in RAM */
phys_size_t ram_size; /* RAM size */

2
include/configs/at91rm9200ek.h
View File

@ -71,6 +71,8 @@
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_INITRD_TAG
#define CONFIG_AT91FAMILY
/*
* Memory Configuration
*/