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[ARM] 2787/2: PXA27x low power modes support

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Patch from Todd Poynor

Add symbols for PXA2xx PWRMODE register M field that selects low-power
mode, replace unadorned constants.  Honor power mode parameter of
pxa_cpu_suspend(mode), no longer force to 3 (sleep).  Full Deep Sleep
low-power mode support for PXA27x is pending generic PM interfaces to
select more than 2 suspend-to-RAM-style power modes, but this is
expected soon. This can be hardcoded in the meantime by replacing the
pxa_cpu_suspend() parameter value.  From David Burrage and Todd Poynor.
Try #2 removes one of the register copies and moves the code to save the
pxa_cpu_suspend parameter to immediately surround the call that requires
the parameter value be preserved.

Signed-off-by: Todd Poynor <tpoynor@mvista.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Todd Poynor 2005-10-28 16:25:01 +01:00 committed by Russell King
parent 917f68f816
commit 80a18573ce
5 changed files with 15 additions and 5 deletions
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2
arch/arm/mach-pxa/pxa25x.c
View File

@ -129,7 +129,7 @@ void pxa_cpu_pm_enter(suspend_state_t state)
case PM_SUSPEND_MEM:
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
pxa_cpu_suspend(3);
pxa_cpu_suspend(PWRMODE_SLEEP);
break;
}
}

2
arch/arm/mach-pxa/pxa27x.c
View File

@ -157,7 +157,7 @@ void pxa_cpu_pm_enter(suspend_state_t state)
case PM_SUSPEND_MEM:
/* set resume return address */
PSPR = virt_to_phys(pxa_cpu_resume);
pxa_cpu_suspend(3);
pxa_cpu_suspend(PWRMODE_SLEEP);
break;
}
}

7
arch/arm/mach-pxa/sleep.S
View File

@ -28,7 +28,9 @@
/*
* pxa_cpu_suspend()
*
* Forces CPU into sleep state
* Forces CPU into sleep state.
*
* r0 = value for PWRMODE M field for desired sleep state
*/
ENTRY(pxa_cpu_suspend)
@ -53,6 +55,7 @@ ENTRY(pxa_cpu_suspend)
mov r10, sp
stmfd sp!, {r3 - r10}
mov r5, r0 @ save sleep mode
@ preserve phys address of stack
mov r0, sp
bl sleep_phys_sp
@ -66,7 +69,7 @@ ENTRY(pxa_cpu_suspend)
@ (also workaround for sighting 28071)
@ prepare value for sleep mode
mov r1, #3 @ sleep mode
mov r1, r5 @ sleep mode
@ prepare pointer to physical address 0 (virtual mapping in generic.c)
mov r2, #UNCACHED_PHYS_0

2
arch/arm/mach-pxa/standby.S
View File

@ -21,7 +21,7 @@
ENTRY(pxa_cpu_standby)
ldr r0, =PSSR
mov r1, #(PSSR_PH | PSSR_STS)
mov r2, #2
mov r2, #PWRMODE_STANDBY
mov r3, #UNCACHED_PHYS_0 @ Read mem context in.
ldr ip, [r3]
b 1f

7
include/asm-arm/arch-pxa/pxa-regs.h
View File

@ -2282,4 +2282,11 @@
#endif
/* PWRMODE register M field values */
#define PWRMODE_IDLE 0x1
#define PWRMODE_STANDBY 0x2
#define PWRMODE_SLEEP 0x3
#define PWRMODE_DEEPSLEEP 0x7
#endif