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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>
This commit is contained in:
Greg Ungerer 2010-09-21 20:39:40 +10:00 committed by Nicolas Ferre
parent a6e016f19d
commit cb809b1a5e
2 changed files with 10 additions and 0 deletions
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6
arch/arm/mach-at91/include/mach/at91x40.h
View File

@ -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 */

4
arch/arm/mach-at91/include/mach/system.h
View File

@ -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.