diff options
Diffstat (limited to 'arch/arm/mach-s3c2410/sleep.S')
| -rw-r--r-- | arch/arm/mach-s3c2410/sleep.S | 54 |
1 files changed, 17 insertions, 37 deletions
diff --git a/arch/arm/mach-s3c2410/sleep.S b/arch/arm/mach-s3c2410/sleep.S index a7561a79fc8..2018c2e1dcc 100644 --- a/arch/arm/mach-s3c2410/sleep.S +++ b/arch/arm/mach-s3c2410/sleep.S @@ -41,15 +41,25 @@ .text - /* s3c2410_cpu_suspend + /* s3c2410_cpu_save * - * put the cpu into sleep mode + * save enough of the CPU state to allow us to re-start + * pm.c code. as we store items like the sp/lr, we will + * end up returning from this function when the cpu resumes + * so the return value is set to mark this. + * + * This arangement means we avoid having to flush the cache + * from this code. * * entry: - * r0 = sleep save block + * r0 = pointer to save block + * + * exit: + * r0 = 0 => we stored everything + * 1 => resumed from sleep */ -ENTRY(s3c2410_cpu_suspend) +ENTRY(s3c2410_cpu_save) stmfd sp!, { r4 - r12, lr } @@ store co-processor registers @@ -62,44 +72,14 @@ ENTRY(s3c2410_cpu_suspend) stmia r0, { r4 - r13 } - @@ flush the caches to ensure everything is back out to - @@ SDRAM before the core powers down - -#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH - bl arm920_flush_kern_cache_all -#endif - - @@ prepare cpu to sleep - - ldr r4, =S3C2410_REFRESH - ldr r5, =S3C24XX_MISCCR - ldr r6, =S3C2410_CLKCON - ldr r7, [ r4 ] @ get REFRESH (and ensure in TLB) - ldr r8, [ r5 ] @ get MISCCR (and ensure in TLB) - ldr r9, [ r6 ] @ get CLKCON (and ensure in TLB) - - orr r7, r7, #S3C2410_REFRESH_SELF @ SDRAM sleep command - orr r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals - orr r9, r9, #S3C2410_CLKCON_POWER @ power down command - - teq pc, #0 @ first as a trial-run to load cache - bl s3c2410_do_sleep - teq r0, r0 @ now do it for real - b s3c2410_do_sleep @ - - @@ align next bit of code to cache line - .align 8 -s3c2410_do_sleep: - streq r7, [ r4 ] @ SDRAM sleep command - streq r8, [ r5 ] @ SDRAM power-down config - streq r9, [ r6 ] @ CPU sleep -1: beq 1b - mov pc, r14 + mov r0, #0 + ldmfd sp, { r4 - r12, pc } @@ return to the caller, after having the MMU @@ turned on, this restores the last bits from the @@ stack resume_with_mmu: + mov r0, #1 ldmfd sp!, { r4 - r12, pc } .ltorg |