OMAP3: PM: Force IVA2 into idle during bootup

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 4474947ddd64..b2a8730771e9 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -352,6 +352,54 @@ static struct platform_suspend_ops omap_pm_ops = {
 	.valid		= suspend_valid_only_mem,
 };
 
+
+/**
+ * omap3_iva_idle(): ensure IVA is in idle so it can be put into
+ *                   retention
+ *
+ * In cases where IVA2 is activated by bootcode, it may prevent
+ * full-chip retention or off-mode because it is not idle.  This
+ * function forces the IVA2 into idle state so it can go
+ * into retention/off and thus allow full-chip retention/off.
+ *
+ **/
+static void __init omap3_iva_idle(void)
+{
+	/* ensure IVA2 clock is disabled */
+	cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
+
+	/* if no clock activity, nothing else to do */
+	if (!(cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
+	      OMAP3430_CLKACTIVITY_IVA2_MASK))
+		return;
+
+	/* Reset IVA2 */
+	prm_write_mod_reg(OMAP3430_RST1_IVA2 |
+			  OMAP3430_RST2_IVA2 |
+			  OMAP3430_RST3_IVA2,
+			  OMAP3430_IVA2_MOD, RM_RSTCTRL);
+
+	/* Enable IVA2 clock */
+	cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2,
+			 OMAP3430_IVA2_MOD, CM_FCLKEN);
+
+	/* Set IVA2 boot mode to 'idle' */
+	omap_ctrl_writel(OMAP3_IVA2_BOOTMOD_IDLE,
+			 OMAP343X_CONTROL_IVA2_BOOTMOD);
+
+	/* Un-reset IVA2 */
+	prm_write_mod_reg(0, OMAP3430_IVA2_MOD, RM_RSTCTRL);
+
+	/* Disable IVA2 clock */
+	cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
+
+	/* Reset IVA2 */
+	prm_write_mod_reg(OMAP3430_RST1_IVA2 |
+			  OMAP3430_RST2_IVA2 |
+			  OMAP3430_RST3_IVA2,
+			  OMAP3430_IVA2_MOD, RM_RSTCTRL);
+}
+
 static void __init prcm_setup_regs(void)
 {
 	/* reset modem */
@@ -511,6 +559,8 @@ static void __init prcm_setup_regs(void)
 	 * it is selected to mpu wakeup goup */
 	prm_write_mod_reg(OMAP3430_IO_EN | OMAP3430_WKUP_EN,
 			  OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
+
+	omap3_iva_idle();
 }
 
 static int __init pwrdms_setup(struct powerdomain *pwrdm)