From: Kalle Jokiniemi <kalle.jokini...@digia.com>
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.jokini...@digia.com>
Signed-off-by: Kevin Hilman <khil...@deeprootsystems.com>
---
arch/arm/mach-omap2/pm34xx.c | 38 +++++++++++++++++++++++++++++--
arch/arm/mach-omap2/prm-regbits-34xx.h | 2 +
2 files changed, 37 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 7623eda..511a57d 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -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();
diff --git a/arch/arm/mach-omap2/prm-regbits-34xx.h
b/arch/arm/mach-omap2/prm-regbits-34xx.h
index 9fd03a2..8f21bae 100644
--- a/arch/arm/mach-omap2/prm-regbits-34xx.h
+++ b/arch/arm/mach-omap2/prm-regbits-34xx.h
@@ -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 */
--
1.6.4.3
--
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