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authorTodd Poynor <tpoynor@mvista.com>2005-07-01 11:27:05 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-07-01 11:27:05 +0100
commit26705ca46bdf81113cc6729eb12b9eee2263bbfc (patch)
treef49950ea17fbdec406404144ee264fa3c6ad5c61 /arch/arm/mach-pxa/standby.S
parent62351cc38d3eaf3de0327054dd6ebc039f4da80d (diff)
downloadop-kernel-dev-26705ca46bdf81113cc6729eb12b9eee2263bbfc.zip
op-kernel-dev-26705ca46bdf81113cc6729eb12b9eee2263bbfc.tar.gz
[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/standby.S')
-rw-r--r--arch/arm/mach-pxa/standby.S32
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/standby.S b/arch/arm/mach-pxa/standby.S
new file mode 100644
index 0000000..8a3f27b
--- /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
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