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Merge branch 'at91-3.4-base+pm_cleanup' of git://github.com/at91linux/linux-at91 into next/cleanup 

* 'at91-3.4-base+pm_cleanup' of git://github.com/at91linux/linux-at91:
  ARM: at91: implement the standby function for pm/cpuidle
  ARM: at91: remove wait_for_interrupt definition
  ARM: at91: declare header name
  ARM: at91: coding style fixes
This commit is contained in:
Olof Johansson 2012-02-07 15:07:37 -08:00
parent 8f9993f76a 00482a4078
commit b01ee53dda
3 changed files with 50 additions and 44 deletions
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11
arch/arm/mach-at91/cpuidle.c
View File

@ -39,20 +39,15 @@ static int at91_enter_idle(struct cpuidle_device *dev,
{
struct timeval before, after;
int idle_time;
u32 saved_lpr;
local_irq_disable();
do_gettimeofday(&before);
if (index == 0)
/* Wait for interrupt state */
cpu_do_idle();
else if (index == 1) {
asm("b 1f; .align 5; 1:");
asm("mcr p15, 0, r0, c7, c10, 4"); /* drain write buffer */
saved_lpr = sdram_selfrefresh_enable();
cpu_do_idle();
sdram_selfrefresh_disable(saved_lpr);
}
else if (index == 1)
at91_standby();
do_gettimeofday(&after);
local_irq_enable();
idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +

12
arch/arm/mach-at91/pm.c
View File

@ -198,7 +198,6 @@ extern u32 at91_slow_clock_sz;
static int at91_pm_enter(suspend_state_t state)
{
u32 saved_lpr;
at91_gpio_suspend();
at91_irq_suspend();
@ -254,16 +253,7 @@ static int at91_pm_enter(suspend_state_t state)
* For ARM 926 based chips, this requirement is weaker
* as at91sam9 can access a RAM in self-refresh mode.
*/
asm volatile ( "mov r0, #0\n\t"
"b 1f\n\t"
".align 5\n\t"
"1: mcr p15, 0, r0, c7, c10, 4\n\t"
: /* no output */
: /* no input */
: "r0");
saved_lpr = sdram_selfrefresh_enable();
wait_for_interrupt_enable();
sdram_selfrefresh_disable(saved_lpr);
at91_standby();
break;
case PM_SUSPEND_ON:

71
arch/arm/mach-at91/pm.h
View File

@ -1,3 +1,16 @@
/*
* AT91 Power Management
*
* Copyright (C) 2005 David Brownell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __ARCH_ARM_MACH_AT91_PM
#define __ARCH_ARM_MACH_AT91_PM
#ifdef CONFIG_ARCH_AT91RM9200
#include <mach/at91rm9200_mc.h>
@ -11,18 +24,25 @@
* still in self-refresh is "not recommended", but seems to work.
*/
static inline u32 sdram_selfrefresh_enable(void)
static inline void at91rm9200_standby(void)
{
u32 saved_lpr = at91_sys_read(AT91_SDRAMC_LPR);
u32 lpr = at91_sys_read(AT91_SDRAMC_LPR);
at91_sys_write(AT91_SDRAMC_LPR, 0);
at91_sys_write(AT91_SDRAMC_SRR, 1);
return saved_lpr;
asm volatile(
"b 1f\n\t"
".align 5\n\t"
"1: mcr p15, 0, %0, c7, c10, 4\n\t"
" str %0, [%1, %2]\n\t"
" str %3, [%1, %4]\n\t"
" mcr p15, 0, %0, c7, c0, 4\n\t"
" str %5, [%1, %2]"
:
: "r" (0), "r" (AT91_BASE_SYS), "r" (AT91_SDRAMC_LPR),
"r" (1), "r" (AT91_SDRAMC_SRR),
"r" (lpr));
}
#define sdram_selfrefresh_disable(saved_lpr) at91_sys_write(AT91_SDRAMC_LPR, saved_lpr)
#define wait_for_interrupt_enable() asm volatile ("mcr p15, 0, %0, c7, c0, 4" \
: : "r" (0))
#define at91_standby at91rm9200_standby
#elif defined(CONFIG_ARCH_AT91SAM9G45)
#include <mach/at91sam9_ddrsdr.h>
@ -30,14 +50,12 @@ static inline u32 sdram_selfrefresh_enable(void)
/* We manage both DDRAM/SDRAM controllers, we need more than one value to
* remember.
*/
static u32 saved_lpr1;
static inline u32 sdram_selfrefresh_enable(void)
static inline void at91sam9g45_standby(void)
{
/* Those tow values allow us to delay self-refresh activation
/* Those two values allow us to delay self-refresh activation
* to the maximum. */
u32 lpr0, lpr1;
u32 saved_lpr0;
u32 saved_lpr0, saved_lpr1;
saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
@ -51,15 +69,13 @@ static inline u32 sdram_selfrefresh_enable(void)
at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
return saved_lpr0;
cpu_do_idle();
at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
}
#define sdram_selfrefresh_disable(saved_lpr0) \
do { \
at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0); \
at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); \
} while (0)
#define wait_for_interrupt_enable() cpu_do_idle()
#define at91_standby at91sam9g45_standby
#else
#include <mach/at91sam9_sdramc.h>
@ -72,18 +88,23 @@ static inline u32 sdram_selfrefresh_enable(void)
#warning Assuming EB1 SDRAM controller is *NOT* used
#endif
static inline u32 sdram_selfrefresh_enable(void)
static inline void at91sam9_standby(void)
{
u32 saved_lpr, lpr;
saved_lpr = at91_ramc_read(0, AT91_SDRAMC_LPR);
lpr = saved_lpr & ~AT91_SDRAMC_LPCB;
at91_ramc_write(0, AT91_SDRAMC_LPR, lpr | AT91_SDRAMC_LPCB_SELF_REFRESH);
return saved_lpr;
at91_ramc_write(0, AT91_SDRAMC_LPR, lpr |
AT91_SDRAMC_LPCB_SELF_REFRESH);
cpu_do_idle();
at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr);
}
#define sdram_selfrefresh_disable(saved_lpr) at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr)
#define wait_for_interrupt_enable() cpu_do_idle()
#define at91_standby at91sam9_standby
#endif
#endif