diff options
| -rw-r--r-- | arch/arm/mach-omap2/powerdomain.c | 43 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/powerdomain.h | 18 |
2 files changed, 50 insertions, 11 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c index eaed0df16699..a11be81997c5 100644 --- a/arch/arm/mach-omap2/powerdomain.c +++ b/arch/arm/mach-omap2/powerdomain.c @@ -2,7 +2,7 @@ * OMAP powerdomain control * * Copyright (C) 2007-2008 Texas Instruments, Inc. - * Copyright (C) 2007-2009 Nokia Corporation + * Copyright (C) 2007-2011 Nokia Corporation * * Written by Paul Walmsley * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> @@ -938,3 +938,44 @@ u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm) return count; } + +/** + * pwrdm_can_ever_lose_context - can this powerdomain ever lose context? + * @pwrdm: struct powerdomain * + * + * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain + * can lose either memory or logic context or if @pwrdm is invalid, or + * returns 0 otherwise. This function is not concerned with how the + * powerdomain registers are programmed (i.e., to go off or not); it's + * concerned with whether it's ever possible for this powerdomain to + * go off while some other part of the chip is active. This function + * assumes that every powerdomain can go to either ON or INACTIVE. + */ +bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm) +{ + int i; + + if (IS_ERR_OR_NULL(pwrdm)) { + pr_debug("powerdomain: %s: invalid powerdomain pointer\n", + __func__); + return 1; + } + + if (pwrdm->pwrsts & PWRSTS_OFF) + return 1; + + if (pwrdm->pwrsts & PWRSTS_RET) { + if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF) + return 1; + + for (i = 0; i < pwrdm->banks; i++) + if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF) + return 1; + } + + for (i = 0; i < pwrdm->banks; i++) + if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF) + return 1; + + return 0; +} diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h index c66431edfeb7..af4f23c73c7a 100644 --- a/arch/arm/mach-omap2/powerdomain.h +++ b/arch/arm/mach-omap2/powerdomain.h @@ -2,7 +2,7 @@ * OMAP2/3/4 powerdomain control * * Copyright (C) 2007-2008, 2010 Texas Instruments, Inc. - * Copyright (C) 2007-2010 Nokia Corporation + * Copyright (C) 2007-2011 Nokia Corporation * * Paul Walmsley * @@ -34,17 +34,14 @@ /* Powerdomain allowable state bitfields */ #define PWRSTS_ON (1 << PWRDM_POWER_ON) +#define PWRSTS_INACTIVE (1 << PWRDM_POWER_INACTIVE) +#define PWRSTS_RET (1 << PWRDM_POWER_RET) #define PWRSTS_OFF (1 << PWRDM_POWER_OFF) -#define PWRSTS_OFF_ON ((1 << PWRDM_POWER_OFF) | \ - (1 << PWRDM_POWER_ON)) -#define PWRSTS_OFF_RET ((1 << PWRDM_POWER_OFF) | \ - (1 << PWRDM_POWER_RET)) - -#define PWRSTS_RET_ON ((1 << PWRDM_POWER_RET) | \ - (1 << PWRDM_POWER_ON)) - -#define PWRSTS_OFF_RET_ON (PWRSTS_OFF_RET | (1 << PWRDM_POWER_ON)) +#define PWRSTS_OFF_ON (PWRSTS_OFF | PWRSTS_ON) +#define PWRSTS_OFF_RET (PWRSTS_OFF | PWRSTS_RET) +#define PWRSTS_RET_ON (PWRSTS_RET | PWRSTS_ON) +#define PWRSTS_OFF_RET_ON (PWRSTS_OFF_RET | PWRSTS_ON) /* Powerdomain flags */ @@ -212,6 +209,7 @@ int pwrdm_pre_transition(void); int pwrdm_post_transition(void); int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm); u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm); +bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm); extern void omap2xxx_powerdomains_init(void); extern void omap3xxx_powerdomains_init(void); |