diff options
Diffstat (limited to 'arch/arm/mach-omap2/powerdomain.c')
| -rw-r--r-- | arch/arm/mach-omap2/powerdomain.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c index eaed0df1669..a11be81997c 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; +} |