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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-07-02 09:54:01 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-02 09:54:01 +0100
commit29cb3cd208dd0e4471bb80bec4facc49ceb199fa (patch)
tree035128bf7af997d5e1e5208c900ba78c5a1df46d /arch
parentcbe263497def23befb6f475977661bae5d1f82e4 (diff)
downloadlinux-linaro-stable-29cb3cd208dd0e4471bb80bec4facc49ceb199fa.tar.gz
ARM: pm: allow suspend finisher to return error codes
There are SoCs where attempting to enter a low power state is ignored, and the CPU continues executing instructions with all state preserved. It is over-complex at that point to disable the MMU just to call the resume path. Instead, allow the suspend finisher to return error codes to abort suspend in this circumstance, where the cpu_suspend internals will then unwind the saved state on the stack. Also omit the tlb flush as no changes to the page tables will have happened. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/suspend.h9
-rw-r--r--arch/arm/kernel/sleep.S11
-rw-r--r--arch/arm/mach-exynos4/pm.c2
-rw-r--r--arch/arm/mach-omap2/pm34xx.c3
-rw-r--r--arch/arm/mach-pxa/include/mach/pm.h4
-rw-r--r--arch/arm/mach-pxa/pxa3xx.c2
-rw-r--r--arch/arm/mach-s3c2412/pm.c4
-rw-r--r--arch/arm/mach-s3c2416/pm.c4
-rw-r--r--arch/arm/mach-s3c64xx/pm.c2
-rw-r--r--arch/arm/mach-sa1100/pm.c2
-rw-r--r--arch/arm/plat-samsung/include/plat/pm.h4
-rw-r--r--arch/arm/plat-samsung/pm.c2
12 files changed, 31 insertions, 18 deletions
diff --git a/arch/arm/include/asm/suspend.h b/arch/arm/include/asm/suspend.h
index f8db9d096bc7..b0e4e1a02318 100644
--- a/arch/arm/include/asm/suspend.h
+++ b/arch/arm/include/asm/suspend.h
@@ -10,12 +10,13 @@ extern void cpu_resume(void);
* Hide the first two arguments to __cpu_suspend - these are an implementation
* detail which platform code shouldn't have to know about.
*/
-static inline void cpu_suspend(unsigned long arg, void (*fn)(unsigned long))
+static inline int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
{
- extern void __cpu_suspend(int, long, unsigned long,
- void (*)(unsigned long));
- __cpu_suspend(0, PHYS_OFFSET - PAGE_OFFSET, arg, fn);
+ extern int __cpu_suspend(int, long, unsigned long,
+ int (*)(unsigned long));
+ int ret = __cpu_suspend(0, PHYS_OFFSET - PAGE_OFFSET, arg, fn);
flush_tlb_all();
+ return ret;
}
#endif
diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index c156d0e5f455..dc902f2c6845 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -12,7 +12,6 @@
* r1 = v:p offset
* r2 = suspend function arg0
* r3 = suspend function
- * Note: does not return until system resumes
*/
ENTRY(__cpu_suspend)
stmfd sp!, {r4 - r11, lr}
@@ -26,7 +25,7 @@ ENTRY(__cpu_suspend)
#endif
mov r6, sp @ current virtual SP
sub sp, sp, r5 @ allocate CPU state on stack
- mov r0, sp @ save pointer
+ mov r0, sp @ save pointer to CPU save block
add ip, ip, r1 @ convert resume fn to phys
stmfd sp!, {r1, r6, ip} @ save v:p, virt SP, phys resume fn
ldr r5, =sleep_save_sp
@@ -55,10 +54,17 @@ ENTRY(__cpu_suspend)
#else
bl __cpuc_flush_kern_all
#endif
+ adr lr, BSYM(cpu_suspend_abort)
ldmfd sp!, {r0, pc} @ call suspend fn
ENDPROC(__cpu_suspend)
.ltorg
+cpu_suspend_abort:
+ ldmia sp!, {r1 - r3} @ pop v:p, virt SP, phys resume fn
+ mov sp, r2
+ ldmfd sp!, {r4 - r11, pc}
+ENDPROC(cpu_suspend_abort)
+
/*
* r0 = control register value
* r1 = v:p offset (preserved by cpu_do_resume)
@@ -89,6 +95,7 @@ cpu_resume_after_mmu:
str r5, [r2, r4, lsl #2] @ restore old mapping
mcr p15, 0, r0, c1, c0, 0 @ turn on D-cache
bl cpu_init @ restore the und/abt/irq banked regs
+ mov r0, #0 @ return zero on success
ldmfd sp!, {r4 - r11, pc}
ENDPROC(cpu_resume_after_mmu)
diff --git a/arch/arm/mach-exynos4/pm.c b/arch/arm/mach-exynos4/pm.c
index 5c01c6076645..533c28f758ca 100644
--- a/arch/arm/mach-exynos4/pm.c
+++ b/arch/arm/mach-exynos4/pm.c
@@ -280,7 +280,7 @@ static struct sleep_save exynos4_l2cc_save[] = {
SAVE_ITEM(S5P_VA_L2CC + L2X0_AUX_CTRL),
};
-void exynos4_cpu_suspend(unsigned long arg)
+static int exynos4_cpu_suspend(unsigned long arg)
{
unsigned long tmp;
unsigned long mask = 0xFFFFFFFF;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 7238a63e24e2..b77d82665abb 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -321,9 +321,10 @@ static void omap34xx_save_context(u32 *save)
*save++ = val;
}
-static void omap34xx_do_sram_idle(unsigned long save_state)
+static int omap34xx_do_sram_idle(unsigned long save_state)
{
omap34xx_cpu_suspend(save_state);
+ return 0;
}
void omap_sram_idle(void)
diff --git a/arch/arm/mach-pxa/include/mach/pm.h b/arch/arm/mach-pxa/include/mach/pm.h
index a566720527cf..51558bcee999 100644
--- a/arch/arm/mach-pxa/include/mach/pm.h
+++ b/arch/arm/mach-pxa/include/mach/pm.h
@@ -22,8 +22,8 @@ struct pxa_cpu_pm_fns {
extern struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
/* sleep.S */
-extern void pxa25x_finish_suspend(unsigned long);
-extern void pxa27x_finish_suspend(unsigned long);
+extern int pxa25x_finish_suspend(unsigned long);
+extern int pxa27x_finish_suspend(unsigned long);
extern int pxa_pm_enter(suspend_state_t state);
extern int pxa_pm_prepare(void);
diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c
index 9fe947b5d5f7..ef1c56a67afc 100644
--- a/arch/arm/mach-pxa/pxa3xx.c
+++ b/arch/arm/mach-pxa/pxa3xx.c
@@ -148,7 +148,7 @@ static void pxa3xx_cpu_pm_suspend(void)
asm volatile("mra %Q0, %R0, acc0" : "=r" (acc0));
#endif
- extern void pxa3xx_finish_suspend(unsigned long);
+ extern int pxa3xx_finish_suspend(unsigned long);
/* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
diff --git a/arch/arm/mach-s3c2412/pm.c b/arch/arm/mach-s3c2412/pm.c
index 9a1fb898db53..f4077efa51fa 100644
--- a/arch/arm/mach-s3c2412/pm.c
+++ b/arch/arm/mach-s3c2412/pm.c
@@ -37,7 +37,7 @@
extern void s3c2412_sleep_enter(void);
-static void s3c2412_cpu_suspend(unsigned long arg)
+static int s3c2412_cpu_suspend(unsigned long arg)
{
unsigned long tmp;
@@ -48,6 +48,8 @@ static void s3c2412_cpu_suspend(unsigned long arg)
__raw_writel(tmp, S3C2412_PWRCFG);
s3c2412_sleep_enter();
+
+ panic("sleep resumed to originator?");
}
static void s3c2412_pm_prepare(void)
diff --git a/arch/arm/mach-s3c2416/pm.c b/arch/arm/mach-s3c2416/pm.c
index 9e67a2a07a86..9ec54f1d8e75 100644
--- a/arch/arm/mach-s3c2416/pm.c
+++ b/arch/arm/mach-s3c2416/pm.c
@@ -24,7 +24,7 @@
extern void s3c2412_sleep_enter(void);
-static void s3c2416_cpu_suspend(unsigned long arg)
+static int s3c2416_cpu_suspend(unsigned long arg)
{
/* enable wakeup sources regardless of battery state */
__raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
@@ -33,6 +33,8 @@ static void s3c2416_cpu_suspend(unsigned long arg)
__raw_writel(0x2BED, S3C2443_PWRMODE);
s3c2412_sleep_enter();
+
+ panic("sleep resumed to originator?");
}
static void s3c2416_pm_prepare(void)
diff --git a/arch/arm/mach-s3c64xx/pm.c b/arch/arm/mach-s3c64xx/pm.c
index 7cc1879af722..8bad64370689 100644
--- a/arch/arm/mach-s3c64xx/pm.c
+++ b/arch/arm/mach-s3c64xx/pm.c
@@ -112,7 +112,7 @@ void s3c_pm_save_core(void)
* this.
*/
-static void s3c64xx_cpu_suspend(unsigned long arg)
+static int s3c64xx_cpu_suspend(unsigned long arg)
{
unsigned long tmp;
diff --git a/arch/arm/mach-sa1100/pm.c b/arch/arm/mach-sa1100/pm.c
index cf9a1e9fb70d..bf85b8b259d5 100644
--- a/arch/arm/mach-sa1100/pm.c
+++ b/arch/arm/mach-sa1100/pm.c
@@ -33,7 +33,7 @@
#include <asm/system.h>
#include <asm/mach/time.h>
-extern void sa1100_finish_suspend(unsigned long);
+extern int sa1100_finish_suspend(unsigned long);
#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
diff --git a/arch/arm/plat-samsung/include/plat/pm.h b/arch/arm/plat-samsung/include/plat/pm.h
index 0a5b7faca836..f6749916d194 100644
--- a/arch/arm/plat-samsung/include/plat/pm.h
+++ b/arch/arm/plat-samsung/include/plat/pm.h
@@ -42,7 +42,7 @@ extern unsigned long s3c_irqwake_eintallow;
/* per-cpu sleep functions */
extern void (*pm_cpu_prep)(void);
-extern void (*pm_cpu_sleep)(unsigned long);
+extern int (*pm_cpu_sleep)(unsigned long);
/* Flags for PM Control */
@@ -54,7 +54,7 @@ extern unsigned char pm_uart_udivslot; /* true to save UART UDIVSLOT */
extern void s3c_cpu_resume(void);
-extern void s3c2410_cpu_suspend(unsigned long);
+extern int s3c2410_cpu_suspend(unsigned long);
/* sleep save info */
diff --git a/arch/arm/plat-samsung/pm.c b/arch/arm/plat-samsung/pm.c
index 69d6b040a019..5fa1742d019b 100644
--- a/arch/arm/plat-samsung/pm.c
+++ b/arch/arm/plat-samsung/pm.c
@@ -232,7 +232,7 @@ static void __maybe_unused s3c_pm_show_resume_irqs(int start,
void (*pm_cpu_prep)(void);
-void (*pm_cpu_sleep)(unsigned long);
+int (*pm_cpu_sleep)(unsigned long);
#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))