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authorTodd Poynor <tpoynor@mvista.com>2005-07-01 06:27:05 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-07-01 06:27:05 -0400
commit26705ca46bdf81113cc6729eb12b9eee2263bbfc (patch)
treef49950ea17fbdec406404144ee264fa3c6ad5c61 /arch
parent62351cc38d3eaf3de0327054dd6ebc039f4da80d (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')
-rw-r--r--arch/arm/mach-pxa/Makefile4
-rw-r--r--arch/arm/mach-pxa/pxa27x.c9
-rw-r--r--arch/arm/mach-pxa/standby.S32
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) += $(led-y)
24 24
25# Misc features 25# Misc features
26obj-$(CONFIG_PM) += pm.o sleep.o 26obj-$(CONFIG_PM) += pm.o sleep.o
27
28ifeq ($(CONFIG_PXA27x),y)
29obj-$(CONFIG_PM) += standby.o
30endif
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)
126{ 126{
127 switch (state) { 127 switch (state) {
128 case PM_SUSPEND_MEM: 128 case PM_SUSPEND_MEM:
129 case PM_SUSPEND_STANDBY:
129 return 0; 130 return 0;
130 default: 131 default:
131 return -EINVAL; 132 return -EINVAL;
@@ -138,7 +139,10 @@ void pxa_cpu_pm_enter(suspend_state_t state)
138 extern void pxa_cpu_suspend(unsigned int); 139 extern void pxa_cpu_suspend(unsigned int);
139 extern void pxa_cpu_resume(void); 140 extern void pxa_cpu_resume(void);
140 141
141 CKEN = CKEN22_MEMC | CKEN9_OSTIMER; 142 if (state == PM_SUSPEND_STANDBY)
143 CKEN = CKEN22_MEMC | CKEN9_OSTIMER | CKEN16_LCD |CKEN0_PWM0;
144 else
145 CKEN = CKEN22_MEMC | CKEN9_OSTIMER;
142 146
143 /* ensure voltage-change sequencer not initiated, which hangs */ 147 /* ensure voltage-change sequencer not initiated, which hangs */
144 PCFR &= ~PCFR_FVC; 148 PCFR &= ~PCFR_FVC;
@@ -147,6 +151,9 @@ void pxa_cpu_pm_enter(suspend_state_t state)
147 PEDR = 0xDF12FE1B; 151 PEDR = 0xDF12FE1B;
148 152
149 switch (state) { 153 switch (state) {
154 case PM_SUSPEND_STANDBY:
155 pxa_cpu_standby();
156 break;
150 case PM_SUSPEND_MEM: 157 case PM_SUSPEND_MEM:
151 /* set resume return address */ 158 /* set resume return address */
152 PSPR = virt_to_phys(pxa_cpu_resume); 159 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 @@
1/*
2 * PXA27x standby mode
3 *
4 * Author: David Burrage
5 *
6 * 2005 (c) MontaVista Software, Inc. This file is licensed under
7 * the terms of the GNU General Public License version 2. This program
8 * is licensed "as is" without any warranty of any kind, whether express
9 * or implied.
10 */
11
12#include <linux/config.h>
13#include <linux/linkage.h>
14#include <asm/assembler.h>
15#include <asm/hardware.h>
16
17#include <asm/arch/pxa-regs.h>
18
19 .text
20
21ENTRY(pxa_cpu_standby)
22 ldr r0, =PSSR
23 mov r1, #(PSSR_PH | PSSR_STS)
24 mov r2, #2
25 mov r3, #UNCACHED_PHYS_0 @ Read mem context in.
26 ldr ip, [r3]
27 b 1f
28
29 .align 5
301: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby
31 str r1, [r0] @ make sure PSSR_PH/STS are clear
32 mov pc, lr