26705ca46b
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>
32 lines
716 B
ArmAsm
32 lines
716 B
ArmAsm
/*
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* PXA27x standby mode
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*
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* Author: David Burrage
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*
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* 2005 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/hardware.h>
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#include <asm/arch/pxa-regs.h>
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.text
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ENTRY(pxa_cpu_standby)
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ldr r0, =PSSR
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mov r1, #(PSSR_PH | PSSR_STS)
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mov r2, #2
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mov r3, #UNCACHED_PHYS_0 @ Read mem context in.
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ldr ip, [r3]
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b 1f
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.align 5
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1: mcr p14, 0, r2, c7, c0, 0 @ put the system into Standby
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str r1, [r0] @ make sure PSSR_PH/STS are clear
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mov pc, lr
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