diff options
| author | Todd Poynor <tpoynor@mvista.com> | 2005-07-01 11:27:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-07-01 11:27:05 +0100 |
| commit | 26705ca46bdf81113cc6729eb12b9eee2263bbfc (patch) | |
| tree | f49950ea17fbdec406404144ee264fa3c6ad5c61 /arch/arm/mach-pxa | |
| parent | 62351cc38d3eaf3de0327054dd6ebc039f4da80d (diff) | |
[PATCH] ARM: 2781/2: PXA27x Standby mode take 2
Patch from Todd Poynor
Add support for PXA27x Standby mode, a low-power mode that retains CPU
and some peripheral state (the existing "sleep" mode is a power-power
mode that retains less state). Activated via:
echo -n standby > /sys/power/state
From: David Burrage and Todd Poynor
Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa')
| -rw-r--r-- | arch/arm/mach-pxa/Makefile | 4 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/pxa27x.c | 9 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/standby.S | 32 |
3 files changed, 44 insertions, 1 deletions
diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile index c4e6d2523585..efc2f657184e 100644 --- a/arch/arm/mach-pxa/Makefile +++ b/arch/arm/mach-pxa/Makefile @@ -24,3 +24,7 @@ obj-$(CONFIG_LEDS) += $(led-y) # Misc features obj-$(CONFIG_PM) += pm.o sleep.o + +ifeq ($(CONFIG_PXA27x),y) +obj-$(CONFIG_PM) += standby.o +endif diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c index 893964fb9659..9a791b07118d 100644 --- a/arch/arm/mach-pxa/pxa27x.c +++ b/arch/arm/mach-pxa/pxa27x.c @@ -126,6 +126,7 @@ int pxa_cpu_pm_prepare(suspend_state_t state) { switch (state) { case PM_SUSPEND_MEM: + case PM_SUSPEND_STANDBY: return 0; default: return -EINVAL; @@ -138,7 +139,10 @@ void pxa_cpu_pm_enter(suspend_state_t state) extern void pxa_cpu_suspend(unsigned int); extern void pxa_cpu_resume(void); - CKEN = CKEN22_MEMC | CKEN9_OSTIMER; + if (state == PM_SUSPEND_STANDBY) + CKEN = CKEN22_MEMC | CKEN9_OSTIMER | CKEN16_LCD |CKEN0_PWM0; + else + CKEN = CKEN22_MEMC | CKEN9_OSTIMER; /* ensure voltage-change sequencer not initiated, which hangs */ PCFR &= ~PCFR_FVC; @@ -147,6 +151,9 @@ void pxa_cpu_pm_enter(suspend_state_t state) PEDR = 0xDF12FE1B; switch (state) { + case PM_SUSPEND_STANDBY: + pxa_cpu_standby(); + break; case PM_SUSPEND_MEM: /* set resume return address */ PSPR = virt_to_phys(pxa_cpu_resume); diff --git a/arch/arm/mach-pxa/standby.S b/arch/arm/mach-pxa/standby.S new file mode 100644 index 000000000000..8a3f27b76784 --- /dev/null +++ b/arch/arm/mach-pxa/standby.S @@ -0,0 +1,32 @@ +/* + * PXA27x standby mode + * + * Author: David Burrage + * + * 2005 (c) MontaVista Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ + +#include <linux/config.h> +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/hardware.h> + +#include <asm/arch/pxa-regs.h> + + .text + +ENTRY(pxa_cpu_standby) + ldr r0, =PSSR + mov r1, #(PSSR_PH | PSSR_STS) + mov r2, #2 + mov r3, #UNCACHED_PHYS_0 @ Read mem context in. + ldr ip, [r3] + b 1f + + .align 5 +1: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby + str r1, [r0] @ make sure PSSR_PH/STS are clear + mov pc, lr |