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| author | Greg Ungerer <gerg@snapgear.com> | 2010-09-21 20:39:40 +1000 |
|---|---|---|
| committer | Nicolas Ferre <nicolas.ferre@atmel.com> | 2010-10-07 19:56:54 +0200 |
| commit | cb809b1a5ebffca8cf0314b788919989e8e4ab5f (patch) | |
| tree | fec437f53dbc5dd30b7289415ce731ec5db1b5f2 | |
| parent | a6e016f19d393fbe4e040bee8155b03b840fa689 (diff) | |
| download | kernel_samsung_smdk4412-cb809b1a5ebffca8cf0314b788919989e8e4ab5f.zip kernel_samsung_smdk4412-cb809b1a5ebffca8cf0314b788919989e8e4ab5f.tar.gz kernel_samsung_smdk4412-cb809b1a5ebffca8cf0314b788919989e8e4ab5f.tar.bz2 | |
AT91: fix use of clock disable on idle for AT91x40 devices
The simpler AT91x40 processors do not have the same power management
controller as the new AT91 devices. They do have a simpler power
controller module that we can use to disable the CPU clock at idle
time. Add code to support that.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
| -rw-r--r-- | arch/arm/mach-at91/include/mach/at91x40.h | 6 | ||||
| -rw-r--r-- | arch/arm/mach-at91/include/mach/system.h | 4 |
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/include/mach/at91x40.h b/arch/arm/mach-at91/include/mach/at91x40.h index d34cdb8..063ac44 100644 --- a/arch/arm/mach-at91/include/mach/at91x40.h +++ b/arch/arm/mach-at91/include/mach/at91x40.h @@ -52,4 +52,10 @@ #define AT91_DBGU_CIDR (AT91_SF + 0) /* CIDR in PS segment */ #define AT91_DBGU_EXID (AT91_SF + 4) /* EXID in PS segment */ +/* + * Support defines for the simple Power Controller module. + */ +#define AT91_PS_CR (AT91_PS + 0) /* PS Control register */ +#define AT91_PS_CR_CPU (1 << 0) /* CPU clock disable bit */ + #endif /* AT91X40_H */ diff --git a/arch/arm/mach-at91/include/mach/system.h b/arch/arm/mach-at91/include/mach/system.h index c80e090..bfbb612 100644 --- a/arch/arm/mach-at91/include/mach/system.h +++ b/arch/arm/mach-at91/include/mach/system.h @@ -33,7 +33,11 @@ static inline void arch_idle(void) * Disable the processor clock. The processor will be automatically * re-enabled by an interrupt or by a reset. */ +#ifdef AT91_PS + at91_sys_write(AT91_PS_CR, AT91_PS_CR_CPU); +#else at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK); +#endif #else /* * Set the processor (CP15) into 'Wait for Interrupt' mode. |