From mboxrd@z Thu Jan 1 00:00:00 1970 From: t-kristo@ti.com (Tero Kristo) Date: Mon, 14 May 2012 13:03:14 +0300 Subject: [PATCHv5 6/8] ARM: OMAP4: pwrdm: add support for reading prev logic and mem states In-Reply-To: <1336989796-26594-1-git-send-email-t-kristo@ti.com> References: <1336989796-26594-1-git-send-email-t-kristo@ti.com> Message-ID: <1336989796-26594-7-git-send-email-t-kristo@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On OMAP4, there is no support to read previous logic state or previous memory state achieved when a power domain transitions to RET. Instead there are module level context registers. In order to support the powerdomain level logic/mem_off_counters on OMAP4, instead use the previous power state achieved (RET) and the *programmed* logic/mem RET state to derive if a powerdomain lost logic or did not. If the powerdomain is programmed to enter RET state and lose logic in RET state, knowing that the powerdomain entered RET is good enough to derive that the logic was lost as well, in such cases. Signed-off-by: Tero Kristo --- arch/arm/mach-omap2/powerdomain44xx.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-omap2/powerdomain44xx.c b/arch/arm/mach-omap2/powerdomain44xx.c index 601325b..ab00736 100644 --- a/arch/arm/mach-omap2/powerdomain44xx.c +++ b/arch/arm/mach-omap2/powerdomain44xx.c @@ -151,6 +151,21 @@ static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm) return v; } +static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) +{ + int state; + + state = omap4_pwrdm_read_prev_pwrst(pwrdm); + + if (state == PWRDM_POWER_OFF) + return PWRDM_POWER_OFF; + + if (state != PWRDM_POWER_RET) + return PWRDM_POWER_ON; + + return omap4_pwrdm_read_logic_retst(pwrdm); +} + static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank) { u32 m, v; @@ -179,6 +194,21 @@ static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank) return v; } +static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) +{ + int state; + + state = omap4_pwrdm_read_prev_pwrst(pwrdm); + + if (state == PWRDM_POWER_OFF) + return PWRDM_POWER_OFF; + + if (state != PWRDM_POWER_RET) + return PWRDM_POWER_ON; + + return omap4_pwrdm_read_mem_retst(pwrdm, bank); +} + static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm) { u32 c = 0; @@ -217,9 +247,11 @@ struct pwrdm_ops omap4_pwrdm_operations = { .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst, .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst, .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst, + .pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst, .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst, .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst, .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst, + .pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst, .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst, .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst, .pwrdm_wait_transition = omap4_pwrdm_wait_transition, -- 1.7.4.1