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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-02-11 11:32:19 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-02-22 17:11:26 +0000 |
| commit | 941aefac4c243cf407d7665d3e64beb32d556acf (patch) | |
| tree | 1e43bde1d1c50d028f8c677f396fa95f194b2687 /arch | |
| parent | 2e2f3d3792de5913897b6bb49ac13915b0b020d5 (diff) | |
| download | linux-941aefac4c243cf407d7665d3e64beb32d556acf.tar.gz | |
ARM: pm: allow generic sleep code to be used with SMP CPU idle
Allow the generic sleep code to be used with SMP CPU idle by storing N CPU stack pointers rather than just one. Tested on Assabet and Tegra 2. Tested-by: Colin Cross <ccross@android.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/sleep.S | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S index 2ba17946619e..bfad698a02e7 100644 --- a/arch/arm/kernel/sleep.S +++ b/arch/arm/kernel/sleep.S @@ -1,4 +1,5 @@ #include <linux/linkage.h> +#include <linux/threads.h> #include <asm/asm-offsets.h> #include <asm/assembler.h> #include <asm/glue-cache.h> @@ -26,7 +27,14 @@ ENTRY(cpu_suspend) stmfd sp!, {r1, r2, r3, ip} @ save v:p, virt SP, retfn, phys resume fn ldr r3, =sleep_save_sp add r2, sp, r1 @ convert SP to phys +#ifdef CONFIG_SMP + ALT_SMP(mrc p15, 0, lr, c0, c0, 5) + ALT_UP(mov lr, #0) + and lr, lr, #15 + str r2, [r3, lr, lsl #2] @ save phys SP +#else str r2, [r3] @ save phys SP +#endif mov lr, pc ldr pc, [r10, #CPU_DO_SUSPEND] @ save CPU state #else @@ -37,7 +45,14 @@ ENTRY(cpu_suspend) stmfd sp!, {r1, r2, r3} @ save v:p, virt SP, return fn ldr r3, =sleep_save_sp add r2, sp, r1 @ convert SP to phys +#ifdef CONFIG_SMP + ALT_SMP(mrc p15, 0, lr, c0, c0, 5) + ALT_UP(mov lr, #0) + and lr, lr, #15 + str r2, [r3, lr, lsl #2] @ save phys SP +#else str r2, [r3] @ save phys SP +#endif bl cpu_do_suspend #endif @@ -95,7 +110,15 @@ ENDPROC(cpu_resume_after_mmu) .data .align ENTRY(cpu_resume) +#ifdef CONFIG_SMP + adr r0, sleep_save_sp + ALT_SMP(mrc p15, 0, r1, c0, c0, 5) + ALT_UP(mov r1, #0) + and r1, r1, #15 + ldr r0, [r0, r1, lsl #2] @ stack phys addr +#else ldr r0, sleep_save_sp @ stack phys addr +#endif msr cpsr_c, #PSR_I_BIT | PSR_F_BIT | SVC_MODE @ set SVC, irqs off #ifdef MULTI_CPU ldmia r0!, {r1, sp, lr, pc} @ load v:p, stack, return fn, resume fn @@ -106,4 +129,6 @@ ENTRY(cpu_resume) ENDPROC(cpu_resume) sleep_save_sp: - .word 0 @ preserve stack phys ptr here + .rept CONFIG_NR_CPUS + .long 0 @ preserve stack phys ptr here + .endr |