From 3a7ec26bb44988051d97479f6dfcfd4942a99049 Mon Sep 17 00:00:00 2001
From: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Date: Thu, 26 Mar 2009 15:59:01 +0200
Subject: [PATCH] OMAP3: PM: Enable IO-CHAIN wakeup

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>
---
 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 7623edabc419..511a57dc7015 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 9fd03a2ec95c..8f21bae6dc1c 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 */
-- 
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