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| author | Nicolas Ferre <nicolas.ferre@atmel.com> | 2010-10-22 18:55:39 +0200 |
|---|---|---|
| committer | Nicolas Ferre <nicolas.ferre@atmel.com> | 2010-10-26 11:32:48 +0200 |
| commit | a2a571b74a3881963d8d09deb272d13afe5b49e3 (patch) | |
| tree | 491cf5ff56293287906f9cfec785345f24cd2180 | |
| parent | 8aeeda822fbfe7da2d4ea391a9757e9532796598 (diff) | |
| download | kernel_samsung_smdk4412-a2a571b74a3881963d8d09deb272d13afe5b49e3.zip kernel_samsung_smdk4412-a2a571b74a3881963d8d09deb272d13afe5b49e3.tar.gz kernel_samsung_smdk4412-a2a571b74a3881963d8d09deb272d13afe5b49e3.tar.bz2 | |
AT91: pm: make sure that r0 is 0 when dealing with cache operations
When using CP15 cache operations (c7), we make sure that Rd (r0)
is actually 0 as ARM 926 TRM is saying.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
| -rw-r--r-- | arch/arm/mach-at91/pm.c | 9 | ||||
| -rw-r--r-- | arch/arm/mach-at91/pm.h | 3 | ||||
| -rw-r--r-- | arch/arm/mach-at91/pm_slowclock.S | 1 |
3 files changed, 10 insertions, 3 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index 87a31ba..dafbacc 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -261,8 +261,13 @@ static int at91_pm_enter(suspend_state_t state) * For ARM 926 based chips, this requirement is weaker * as at91sam9 can access a RAM in self-refresh mode. */ - asm("b 1f; .align 5; 1:"); - asm("mcr p15, 0, r0, c7, c10, 4"); /* drain write buffer */ + asm volatile ( "mov r0, #0\n\t" + "b 1f\n\t" + ".align 5\n\t" + "1: mcr p15, 0, r0, c7, c10, 4\n\t" + : /* no output */ + : /* no input */ + : "r0"); saved_lpr = sdram_selfrefresh_enable(); wait_for_interrupt_enable(); sdram_selfrefresh_disable(saved_lpr); diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h index 2c4424b..ce9a206 100644 --- a/arch/arm/mach-at91/pm.h +++ b/arch/arm/mach-at91/pm.h @@ -21,7 +21,8 @@ static inline u32 sdram_selfrefresh_enable(void) } #define sdram_selfrefresh_disable(saved_lpr) at91_sys_write(AT91_SDRAMC_LPR, saved_lpr) -#define wait_for_interrupt_enable() asm("mcr p15, 0, r0, c7, c0, 4") +#define wait_for_interrupt_enable() asm volatile ("mcr p15, 0, %0, c7, c0, 4" \ + : : "r" (0)) #elif defined(CONFIG_ARCH_AT91CAP9) #include <mach/at91cap9_ddrsdr.h> diff --git a/arch/arm/mach-at91/pm_slowclock.S b/arch/arm/mach-at91/pm_slowclock.S index b6b00a1..f7922a4 100644 --- a/arch/arm/mach-at91/pm_slowclock.S +++ b/arch/arm/mach-at91/pm_slowclock.S @@ -124,6 +124,7 @@ ENTRY(at91_slow_clock) ldr r5, .at91_va_base_ramc1 /* Drain write buffer */ + mov r0, #0 mcr p15, 0, r0, c7, c10, 4 #ifdef CONFIG_ARCH_AT91RM9200 |