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ARM: shmobile: sh7372 A3SM CPUIdle support
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Add CPUIdle support for the A3SM power domain on sh7372.

With this in place we can turn off more of the SoC during
run time and save power. Makes use of the recently introduced
sh7372 INTCA A3SM power domain wakeup support.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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Magnus Damm authored and Rafael J. Wysocki committed Jul 5, 2012
1 parent 591e2ac commit 3abd69d
Showing 1 changed file with 36 additions and 14 deletions.
50 changes: 36 additions & 14 deletions arch/arm/mach-shmobile/pm-sh7372.c
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Original file line number Diff line number Diff line change
Expand Up @@ -300,9 +300,6 @@ static void sh7372_set_reset_vector(unsigned long address)
__raw_writel(0, APARMBAREA);
}

#endif

#ifdef CONFIG_SUSPEND
static void sh7372_enter_sysc(int pllc0_on, unsigned long sleep_mode)
{
if (pllc0_on)
Expand Down Expand Up @@ -448,17 +445,6 @@ static void sh7372_enter_a3sm_common(int pllc0_on)
sh7372_enter_sysc(pllc0_on, 1 << 12);
}

static void sh7372_enter_a4s_common(int pllc0_on)
{
sh7372_intca_suspend();
memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
sh7372_set_reset_vector(SMFRAM);
sh7372_enter_sysc(pllc0_on, 1 << 10);
sh7372_intca_resume();
}

#endif

#ifdef CONFIG_CPU_IDLE
static int sh7372_do_idle_core_standby(unsigned long unused)
{
Expand All @@ -479,6 +465,16 @@ static void sh7372_enter_core_standby(void)
__raw_writel(0, SBAR);
}

static void sh7372_enter_a3sm_pll_on(void)
{
sh7372_enter_a3sm_common(1);
}

static void sh7372_enter_a3sm_pll_off(void)
{
sh7372_enter_a3sm_common(0);
}

static void sh7372_cpuidle_setup(struct cpuidle_driver *drv)
{
struct cpuidle_state *state = &drv->states[drv->state_count];
Expand All @@ -489,7 +485,24 @@ static void sh7372_cpuidle_setup(struct cpuidle_driver *drv)
state->target_residency = 20 + 10;
state->flags = CPUIDLE_FLAG_TIME_VALID;
shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_core_standby;
drv->state_count++;

state = &drv->states[drv->state_count];
snprintf(state->name, CPUIDLE_NAME_LEN, "C3");
strncpy(state->desc, "A3SM PLL ON", CPUIDLE_DESC_LEN);
state->exit_latency = 20;
state->target_residency = 30 + 20;
state->flags = CPUIDLE_FLAG_TIME_VALID;
shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_a3sm_pll_on;
drv->state_count++;

state = &drv->states[drv->state_count];
snprintf(state->name, CPUIDLE_NAME_LEN, "C4");
strncpy(state->desc, "A3SM PLL OFF", CPUIDLE_DESC_LEN);
state->exit_latency = 120;
state->target_residency = 30 + 120;
state->flags = CPUIDLE_FLAG_TIME_VALID;
shmobile_cpuidle_modes[drv->state_count] = sh7372_enter_a3sm_pll_off;
drv->state_count++;
}

Expand All @@ -502,6 +515,14 @@ static void sh7372_cpuidle_init(void) {}
#endif

#ifdef CONFIG_SUSPEND
static void sh7372_enter_a4s_common(int pllc0_on)
{
sh7372_intca_suspend();
memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
sh7372_set_reset_vector(SMFRAM);
sh7372_enter_sysc(pllc0_on, 1 << 10);
sh7372_intca_resume();
}

static int sh7372_enter_suspend(suspend_state_t suspend_state)
{
Expand Down Expand Up @@ -562,6 +583,7 @@ static void sh7372_suspend_init(void)
#else
static void sh7372_suspend_init(void) {}
#endif
#endif /* CONFIG_SUSPEND || CONFIG_CPU_IDLE */

void __init sh7372_pm_init(void)
{
Expand Down

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