From 72e27c14286358a277d26d0ae8d415656dd608a7 Mon Sep 17 00:00:00 2001 From: Kevin Hilman Date: Tue, 25 Nov 2008 11:48:24 -0800 Subject: [PATCH] OMAP3: PM: Force IVA2 into idle during bootup Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/pm34xx.c | 46 +++++++++++++++++++++++ arch/arm/plat-omap/include/mach/control.h | 5 +++ 2 files changed, 51 insertions(+) diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index da112b8b08a..8b4b8623f8d 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "cm.h" #include "cm-regbits-34xx.h" @@ -378,6 +379,49 @@ 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); + + /* 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) { /* XXX Reset all wkdeps. This should be done when initializing @@ -531,6 +575,8 @@ 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, OMAP2_PRM_IRQENABLE_MPU_OFFSET); + + omap3_iva_idle(); } static int __init pwrdms_setup(struct powerdomain *pwrdm) diff --git a/arch/arm/plat-omap/include/mach/control.h b/arch/arm/plat-omap/include/mach/control.h index 4cbe212853c..40385960db9 100644 --- a/arch/arm/plat-omap/include/mach/control.h +++ b/arch/arm/plat-omap/include/mach/control.h @@ -212,6 +212,11 @@ #define OMAP3_PADCONF_WAKEUPEVENT0 (1 << 15) #define OMAP3_PADCONF_WAKEUPENABLE0 (1 << 14) +/* CONTROL_IVA2_BOOTMOD bits */ +#define OMAP3_IVA2_BOOTMOD_SHIFT 0 +#define OMAP3_IVA2_BOOTMOD_MASK (0xf << 0) +#define OMAP3_IVA2_BOOTMOD_IDLE (0x1 << 0) + #ifndef __ASSEMBLY__ #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) extern void __iomem *omap_ctrl_base_get(void); -- 2.41.0