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OMAP3: PM: handle PER/NEON/CORE in idle

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Expand the powerdomains handled in the idle path to include PER, NEON
and CORE.  This includes properly clearing the previous powerstates,
linking NEON state to MPU state and calling the UART prepare functions
for only the appropraite powerdomain transitions (CORE for UART1,2,
PER for UART3.)

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Rajendra Nayak 2008-09-26 17:49:22 +05:30 committed by Kevin Hilman
parent 3231fc889c
commit fa3c2a4fc9
1 changed files with 54 additions and 10 deletions
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64
arch/arm/mach-omap2/pm34xx.c
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@ -49,7 +49,10 @@ static LIST_HEAD(pwrst_list);
static void (*_omap_sram_idle)(u32 *addr, int save_state);
static struct powerdomain *mpu_pwrdm;
static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state);
/*
* PRCM Interrupt Handler Helper Function
@ -169,13 +172,22 @@ static void omap_sram_idle(void)
/* save_state = 1 => Only L1 and logic lost */
/* save_state = 2 => Only L2 lost */
/* save_state = 3 => L1, L2 and logic lost */
int save_state = 0, mpu_next_state;
int save_state = 0;
int mpu_next_state = PWRDM_POWER_ON;
int per_next_state = PWRDM_POWER_ON;
int core_next_state = PWRDM_POWER_ON;
if (!_omap_sram_idle)
return;
pwrdm_clear_all_prev_pwrst(mpu_pwrdm);
pwrdm_clear_all_prev_pwrst(neon_pwrdm);
pwrdm_clear_all_prev_pwrst(core_pwrdm);
pwrdm_clear_all_prev_pwrst(per_pwrdm);
mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm);
switch (mpu_next_state) {
case PWRDM_POWER_ON:
case PWRDM_POWER_RET:
/* No need to save context */
save_state = 0;
@ -187,18 +199,37 @@ static void omap_sram_idle(void)
}
pwrdm_pre_transition();
omap2_gpio_prepare_for_retention();
omap_uart_prepare_idle(0);
omap_uart_prepare_idle(1);
omap_uart_prepare_idle(2);
/* NEON control */
if (pwrdm_read_pwrst(neon_pwrdm) == PWRDM_POWER_ON)
set_pwrdm_state(neon_pwrdm, mpu_next_state);
/* CORE & PER */
core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
if (core_next_state < PWRDM_POWER_ON) {
omap2_gpio_prepare_for_retention();
omap_uart_prepare_idle(0);
omap_uart_prepare_idle(1);
/* PER changes only with core */
per_next_state = pwrdm_read_next_pwrst(per_pwrdm);
if (per_next_state < PWRDM_POWER_ON)
omap_uart_prepare_idle(2);
/* Enable IO-PAD wakeup */
prm_set_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
}
_omap_sram_idle(NULL, save_state);
cpu_init();
omap_uart_resume_idle(2);
omap_uart_resume_idle(1);
omap_uart_resume_idle(0);
omap2_gpio_resume_after_retention();
if (core_next_state < PWRDM_POWER_ON) {
if (per_next_state < PWRDM_POWER_ON)
omap_uart_resume_idle(2);
omap_uart_resume_idle(1);
omap_uart_resume_idle(0);
/* Disable IO-PAD wakeup */
prm_clear_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
omap2_gpio_resume_after_retention();
}
pwrdm_post_transition();
@ -792,6 +823,10 @@ static int __init omap3_pm_init(void)
goto err2;
}
neon_pwrdm = pwrdm_lookup("neon_pwrdm");
per_pwrdm = pwrdm_lookup("per_pwrdm");
core_pwrdm = pwrdm_lookup("core_pwrdm");
omap_push_sram_idle();
#ifdef CONFIG_SUSPEND
suspend_set_ops(&omap_pm_ops);
@ -799,6 +834,15 @@ static int __init omap3_pm_init(void)
pm_idle = omap3_pm_idle;
pwrdm_add_wkdep(neon_pwrdm, mpu_pwrdm);
/*
* REVISIT: This wkdep is only necessary when GPIO2-6 are enabled for
* IO-pad wakeup. Otherwise it will unnecessarily waste power
* waking up PER with every CORE wakeup - see
* http://marc.info/?l=linux-omap&m=121852150710062&w=2
*/
pwrdm_add_wkdep(per_pwrdm, core_pwrdm);
err1:
return ret;
err2: