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ARM: pm: allow generic sleep code to be used with SMP CPU idle

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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>
This commit is contained in:
Russell King 2011-02-11 11:32:19 +00:00
parent 2e2f3d3792
commit 941aefac4c
1 changed files with 26 additions and 1 deletions
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27
arch/arm/kernel/sleep.S
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@ -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