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OMAP3: PM: Enable IO-CHAIN wakeup

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OMAP 3430 ES3.1 chips have a separate bit for IO daisy-chain
wake up enabling. It needs to be enabled when entering
retention or off state, otherwise waking up might not work
in all situations.

Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kalle Jokiniemi 2009-03-26 15:59:01 +02:00 committed by Kevin Hilman
parent c16c3f672d
commit 3a7ec26bb4
2 changed files with 37 additions and 3 deletions
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38
arch/arm/mach-omap2/pm34xx.c
View file

@ -94,6 +94,35 @@ static inline void omap3_per_restore_context(void)
omap_gpio_restore_context();
}
static void omap3_enable_io_chain(void)
{
int timeout = 0;
if (omap_rev() >= OMAP3430_REV_ES3_1) {
prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
/* Do a readback to assure write has been done */
prm_read_mod_reg(WKUP_MOD, PM_WKEN);
while (!(prm_read_mod_reg(WKUP_MOD, PM_WKST) &
OMAP3430_ST_IO_CHAIN)) {
timeout++;
if (timeout > 1000) {
printk(KERN_ERR "Wake up daisy chain "
"activation failed.\n");
return;
}
prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN,
WKUP_MOD, PM_WKST);
}
}
}
static void omap3_disable_io_chain(void)
{
if (omap_rev() >= OMAP3430_REV_ES3_1)
prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN, WKUP_MOD, PM_WKEN);
}
static void omap3_core_save_context(void)
{
u32 control_padconf_off;
@ -367,8 +396,9 @@ static void omap_sram_idle(void)
omap3_core_save_context();
omap3_prcm_save_context();
}
/* Enable IO-PAD wakeup */
/* Enable IO-PAD and IO-CHAIN wakeups */
prm_set_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
omap3_enable_io_chain();
}
/*
@ -432,9 +462,11 @@ static void omap_sram_idle(void)
pwrdm_set_next_pwrst(per_pwrdm, PWRDM_POWER_OFF);
}
/* Disable IO-PAD wakeup */
if (core_next_state < PWRDM_POWER_ON)
/* Disable IO-PAD and IO-CHAIN wakeup */
if (core_next_state < PWRDM_POWER_ON) {
prm_clear_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
omap3_disable_io_chain();
}
pwrdm_post_transition();

2
arch/arm/mach-omap2/prm-regbits-34xx.h
View file

@ -365,6 +365,7 @@
/* PM_PREPWSTST_GFX specific bits */
/* PM_WKEN_WKUP specific bits */
#define OMAP3430_EN_IO_CHAIN (1 << 16)
#define OMAP3430_EN_IO (1 << 8)
#define OMAP3430_EN_GPIO1 (1 << 3)
@ -373,6 +374,7 @@
/* PM_IVA2GRPSEL_WKUP specific bits */
/* PM_WKST_WKUP specific bits */
#define OMAP3430_ST_IO_CHAIN (1 << 16)
#define OMAP3430_ST_IO (1 << 8)
/* PRM_CLKSEL */