diff options
Diffstat (limited to 'arch/arm/mach-pxa/sleep.S')
| -rw-r--r-- | arch/arm/mach-pxa/sleep.S | 112 |
1 files changed, 73 insertions, 39 deletions
diff --git a/arch/arm/mach-pxa/sleep.S b/arch/arm/mach-pxa/sleep.S index 15874b3..aff71fe 100644 --- a/arch/arm/mach-pxa/sleep.S +++ b/arch/arm/mach-pxa/sleep.S @@ -17,28 +17,12 @@ #include <asm/arch/pxa-regs.h> -#ifdef CONFIG_PXA27x // workaround for Errata 50 #define MDREFR_KDIV 0x200a4000 // all banks #define CCCR_SLEEP 0x00000107 // L=7 2N=2 A=0 PPDIS=0 CPDIS=0 -#endif .text -/* - * pxa_cpu_suspend() - * - * Forces CPU into sleep state. - * - * r0 = value for PWRMODE M field for desired sleep state - */ - -ENTRY(pxa_cpu_suspend) - -#ifndef CONFIG_IWMMXT - mra r2, r3, acc0 -#endif - stmfd sp!, {r2 - r12, lr} @ save registers on stack - +pxa_cpu_save_cp: @ get coprocessor registers mrc p14, 0, r3, c6, c0, 0 @ clock configuration, for turbo mode mrc p15, 0, r4, c15, c1, 0 @ CP access reg @@ -54,12 +38,36 @@ ENTRY(pxa_cpu_suspend) mov r10, sp stmfd sp!, {r3 - r10} - mov r5, r0 @ save sleep mode + mov pc, lr + +pxa_cpu_save_sp: @ preserve phys address of stack mov r0, sp + mov r2, lr bl sleep_phys_sp ldr r1, =sleep_save_sp str r0, [r1] + mov pc, r2 + +/* + * pxa27x_cpu_suspend() + * + * Forces CPU into sleep state. + * + * r0 = value for PWRMODE M field for desired sleep state + */ + +ENTRY(pxa27x_cpu_suspend) + +#ifndef CONFIG_IWMMXT + mra r2, r3, acc0 +#endif + stmfd sp!, {r2 - r12, lr} @ save registers on stack + + bl pxa_cpu_save_cp + + mov r5, r0 @ save sleep mode + bl pxa_cpu_save_sp @ clean data cache bl xscale_flush_kern_cache_all @@ -80,13 +88,55 @@ ENTRY(pxa_cpu_suspend) @ enable SDRAM self-refresh mode orr r5, r5, #MDREFR_SLFRSH -#ifdef CONFIG_PXA27x @ set SDCLKx divide-by-2 bits (this is part of a workaround for Errata 50) ldr r6, =MDREFR_KDIV orr r5, r5, r6 -#endif -#ifdef CONFIG_PXA25x + @ Intel PXA270 Specification Update notes problems sleeping + @ with core operating above 91 MHz + @ (see Errata 50, ...processor does not exit from sleep...) + + ldr r6, =CCCR + ldr r8, [r6] @ keep original value for resume + + ldr r7, =CCCR_SLEEP @ prepare CCCR sleep value + mov r0, #0x2 @ prepare value for CLKCFG + + @ align execution to a cache line + b pxa_cpu_do_suspend + +/* + * pxa27x_cpu_suspend() + * + * Forces CPU into sleep state. + * + * r0 = value for PWRMODE M field for desired sleep state + */ + +ENTRY(pxa25x_cpu_suspend) + stmfd sp!, {r2 - r12, lr} @ save registers on stack + + bl pxa_cpu_save_cp + + mov r5, r0 @ save sleep mode + bl pxa_cpu_save_sp + + @ clean data cache + bl xscale_flush_kern_cache_all + + @ prepare value for sleep mode + mov r1, r5 @ sleep mode + + @ prepare pointer to physical address 0 (virtual mapping in generic.c) + mov r2, #UNCACHED_PHYS_0 + + @ prepare SDRAM refresh settings + ldr r4, =MDREFR + ldr r5, [r4] + + @ enable SDRAM self-refresh mode + orr r5, r5, #MDREFR_SLFRSH + @ Intel PXA255 Specification Update notes problems @ about suspending with PXBus operating above 133MHz @ (see Errata 31, GPIO output signals, ... unpredictable in sleep @@ -118,30 +168,15 @@ ENTRY(pxa_cpu_suspend) mov r0, #0 mcr p14, 0, r0, c6, c0, 0 orr r0, r0, #2 @ initiate change bit -#endif -#ifdef CONFIG_PXA27x - @ Intel PXA270 Specification Update notes problems sleeping - @ with core operating above 91 MHz - @ (see Errata 50, ...processor does not exit from sleep...) - - ldr r6, =CCCR - ldr r8, [r6] @ keep original value for resume - - ldr r7, =CCCR_SLEEP @ prepare CCCR sleep value - mov r0, #0x2 @ prepare value for CLKCFG -#endif - - @ align execution to a cache line - b 1f + b pxa_cpu_do_suspend .ltorg .align 5 -1: +pxa_cpu_do_suspend: @ All needed values are now in registers. @ These last instructions should be in cache -#if defined(CONFIG_PXA25x) || defined(CONFIG_PXA27x) @ initiate the frequency change... str r7, [r6] mcr p14, 0, r0, c6, c0, 0 @@ -155,7 +190,6 @@ ENTRY(pxa_cpu_suspend) mov r0, #42 10: subs r0, r0, #1 bne 10b -#endif @ Do not reorder... @ Intel PXA270 Specification Update notes problems performing |