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| author |   Arnd Bergmann <arnd@arndb.de> | 2013-01-25 22:44:17 +0000 |
|---|---|---|
| committer |   Nicolas Ferre <nicolas.ferre@atmel.com> | 2013-04-18 16:31:02 +0200 |
| commit | f5fa4098c3fcc0e504fbc0682dccd331dbbcf197 (patch) | |
| tree | f409c2b7fea4d220a6e0682f09c1133f208fe97b | |
| parent | ARM: at91: change "Unknown" qualifier SoC subtype handling (diff) | |
| download | linux-dev-f5fa4098c3fcc0e504fbc0682dccd331dbbcf197.tar.xz linux-dev-f5fa4098c3fcc0e504fbc0682dccd331dbbcf197.zip | |
ARM: at91: suspend both memory controllers on at91sam9263
For the past three years, we have had a #warning in
mach-at91 about the sdram_selfrefresh_enable or
at91sam9_standby functions possibly not working on
at91sam9263. In the meantime a function was added
to do the right thing on at91sam9g45, which looks like
it should also work on '9263.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[nicolas.ferre@atmel.com: remove paragraph in commit message]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
| -rw-r--r-- | arch/arm/mach-at91/cpuidle.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-at91/pm.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-at91/pm.h | 30 |
3 files changed, 28 insertions, 6 deletions
diff --git a/arch/arm/mach-at91/cpuidle.c b/arch/arm/mach-at91/cpuidle.c index 0c6381516a5a..4c6794603780 100644 --- a/arch/arm/mach-at91/cpuidle.c +++ b/arch/arm/mach-at91/cpuidle.c @@ -38,6 +38,8 @@ static int at91_enter_idle(struct cpuidle_device *dev, at91rm9200_standby(); else if (cpu_is_at91sam9g45()) at91sam9g45_standby(); + else if (cpu_is_at91sam9263()) + at91sam9263_standby(); else at91sam9_standby(); diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index adb6db888a1f..b8017c1a864d 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -267,6 +267,8 @@ static int at91_pm_enter(suspend_state_t state) at91rm9200_standby(); else if (cpu_is_at91sam9g45()) at91sam9g45_standby(); + else if (cpu_is_at91sam9263()) + at91sam9263_standby(); else at91sam9_standby(); break; diff --git a/arch/arm/mach-at91/pm.h b/arch/arm/mach-at91/pm.h index 38f467c6b710..2f5908f0b8c5 100644 --- a/arch/arm/mach-at91/pm.h +++ b/arch/arm/mach-at91/pm.h @@ -70,13 +70,31 @@ static inline void at91sam9g45_standby(void) at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1); } -#ifdef CONFIG_SOC_AT91SAM9263 -/* - * FIXME either or both the SDRAM controllers (EB0, EB1) might be in use; - * handle those cases both here and in the Suspend-To-RAM support. +/* We manage both DDRAM/SDRAM controllers, we need more than one value to + * remember. */ -#warning Assuming EB1 SDRAM controller is *NOT* used -#endif +static inline void at91sam9263_standby(void) +{ + u32 lpr0, lpr1; + u32 saved_lpr0, saved_lpr1; + + saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR); + lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB; + lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH; + + saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR); + lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB; + lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH; + + /* self-refresh mode now */ + at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0); + at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1); + + cpu_do_idle(); + + at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0); + at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1); +} static inline void at91sam9_standby(void) { |