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OMAP3: PM: CPUidle: support retention and off-mode C-states 

This patch adds support and enables state C4(MPU RET + CORE RET)
and MPU OFF states (C3 and C5.)

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Rajendra Nayak 2008-10-08 17:31:22 +05:30 committed by Kevin Hilman
parent 99e6a4d22f
commit 20b0166988
3 changed files with 20 additions and 16 deletions
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28
arch/arm/mach-omap2/cpuidle34xx.c
View File

@ -26,6 +26,8 @@
#include <plat/prcm.h>
#include <plat/powerdomain.h>
#include <plat/irqs.h>
#include <plat/control.h>
#ifdef CONFIG_CPU_IDLE
@ -50,10 +52,12 @@ struct omap3_processor_cx {
struct omap3_processor_cx omap3_power_states[OMAP3_MAX_STATES];
struct omap3_processor_cx current_cx_state;
struct powerdomain *mpu_pd;
struct powerdomain *mpu_pd, *core_pd;
static int omap3_idle_bm_check(void)
{
if (!omap3_can_sleep())
return 1;
return 0;
}
@ -79,24 +83,23 @@ static int omap3_enter_idle(struct cpuidle_device *dev,
local_irq_disable();
local_fiq_disable();
/* Program MPU to target state */
if (cx->mpu_state < PWRDM_POWER_ON)
pwrdm_set_next_pwrst(mpu_pd, cx->mpu_state);
set_pwrdm_state(mpu_pd, cx->mpu_state);
set_pwrdm_state(core_pd, cx->core_state);
if (omap_irq_pending())
goto return_sleep_time;
/* Execute ARM wfi */
omap_sram_idle();
/* Program MPU to ON */
if (cx->mpu_state < PWRDM_POWER_ON)
pwrdm_set_next_pwrst(mpu_pd, PWRDM_POWER_ON);
return_sleep_time:
getnstimeofday(&ts_postidle);
ts_idle = timespec_sub(ts_postidle, ts_preidle);
local_irq_enable();
local_fiq_enable();
return timespec_to_ns(&ts_idle);
return (u32)timespec_to_ns(&ts_idle)/1000;
}
/**
@ -153,7 +156,7 @@ void omap_init_power_states(void)
omap3_power_states[OMAP3_STATE_C2].flags = CPUIDLE_FLAG_TIME_VALID;
/* C3 . MPU OFF + Core active */
omap3_power_states[OMAP3_STATE_C3].valid = 0;
omap3_power_states[OMAP3_STATE_C3].valid = 1;
omap3_power_states[OMAP3_STATE_C3].type = OMAP3_STATE_C3;
omap3_power_states[OMAP3_STATE_C3].sleep_latency = 1500;
omap3_power_states[OMAP3_STATE_C3].wakeup_latency = 1800;
@ -163,7 +166,7 @@ void omap_init_power_states(void)
omap3_power_states[OMAP3_STATE_C3].flags = CPUIDLE_FLAG_TIME_VALID;
/* C4 . MPU CSWR + Core CSWR*/
omap3_power_states[OMAP3_STATE_C4].valid = 0;
omap3_power_states[OMAP3_STATE_C4].valid = 1;
omap3_power_states[OMAP3_STATE_C4].type = OMAP3_STATE_C4;
omap3_power_states[OMAP3_STATE_C4].sleep_latency = 2500;
omap3_power_states[OMAP3_STATE_C4].wakeup_latency = 7500;
@ -174,7 +177,7 @@ void omap_init_power_states(void)
CPUIDLE_FLAG_CHECK_BM;
/* C5 . MPU OFF + Core CSWR */
omap3_power_states[OMAP3_STATE_C5].valid = 0;
omap3_power_states[OMAP3_STATE_C5].valid = 1;
omap3_power_states[OMAP3_STATE_C5].type = OMAP3_STATE_C5;
omap3_power_states[OMAP3_STATE_C5].sleep_latency = 3000;
omap3_power_states[OMAP3_STATE_C5].wakeup_latency = 8500;
@ -215,6 +218,7 @@ int omap3_idle_init(void)
struct cpuidle_device *dev;
mpu_pd = pwrdm_lookup("mpu_pwrdm");
core_pd = pwrdm_lookup("core_pwrdm");
omap_init_power_states();
cpuidle_register_driver(&omap3_idle_driver);

2
arch/arm/mach-omap2/pm.h
View File

@ -19,6 +19,8 @@ extern u32 sleep_while_idle;
extern void *omap3_secure_ram_storage;
extern void omap3_pm_off_mode_enable(int);
extern void omap_sram_idle(void);
extern int omap3_can_sleep(void);
extern int set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);

6
arch/arm/mach-omap2/pm34xx.c
View File

@ -76,8 +76,6 @@ static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;
static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
static inline void omap3_per_save_context(void)
{
omap_gpio_save_context();
@ -503,7 +501,7 @@ static int omap3_fclks_active(void)
return 0;
}
static int omap3_can_sleep(void)
int omap3_can_sleep(void)
{
if (!sleep_while_idle)
return 0;
@ -517,7 +515,7 @@ static int omap3_can_sleep(void)
/* This sets pwrdm state (other than mpu & core. Currently only ON &
* RET are supported. Function is assuming that clkdm doesn't have
* hw_sup mode enabled. */
static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
{
u32 cur_state;
int sleep_switch = 0;