diff options
| author | Magnus Damm <damm@opensource.se> | 2011-09-25 23:20:49 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-09-25 23:20:49 +0200 |
| commit | cf33835c5fc528cacd4f98bc38f246022dad340d (patch) | |
| tree | 4142c54bfcc9e95468d8d3e872583d306d6484e7 /arch/arm/mach-shmobile/sleep-sh7372.S | |
| parent | 06b841666a5a47918d31472dd77837906f999a9a (diff) | |
ARM: mach-shmobile: sh7372 A3SM support
This patch adds sh7372 A3SM power domain support.
The sh7372 A3SM hardware power domain contains the
ARM Cortex-A8 CPU Core including L2 cache. This
sleep mode can be seen as a one step deeper sleep
mode from the already existing Core Standby mode.
To wake up from A3SM sleep only a few wakeup sources
are supported - so the regular INTC controller will
not be able to help us unfortunately.
The code in this patch will enter A3SM sleep via the
regular Suspend-to-RAM interface in the case of only
wakeups supported by A3SM are enabled. If unsupported
wakeups are enabled then Core Standby will be used
instead.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'arch/arm/mach-shmobile/sleep-sh7372.S')
| -rw-r--r-- | arch/arm/mach-shmobile/sleep-sh7372.S | 55 |
1 files changed, 53 insertions, 2 deletions
diff --git a/arch/arm/mach-shmobile/sleep-sh7372.S b/arch/arm/mach-shmobile/sleep-sh7372.S index dedf6126789c..d365842ded47 100644 --- a/arch/arm/mach-shmobile/sleep-sh7372.S +++ b/arch/arm/mach-shmobile/sleep-sh7372.S @@ -36,7 +36,58 @@ .align 12 .text - .global sh7372_resume_core_standby -sh7372_resume_core_standby: + .global sh7372_resume_core_standby_a3sm +sh7372_resume_core_standby_a3sm: ldr pc, 1f 1: .long cpu_resume - PAGE_OFFSET + PLAT_PHYS_OFFSET + + .global sh7372_do_idle_a3sm +sh7372_do_idle_a3sm: + /* + * Clear the SCTLR.C bit to prevent further data cache + * allocation. Clearing SCTLR.C would make all the data accesses + * strongly ordered and would not hit the cache. + */ + mrc p15, 0, r0, c1, c0, 0 + bic r0, r0, #(1 << 2) @ Disable the C bit + mcr p15, 0, r0, c1, c0, 0 + isb + + /* disable L2 cache in the aux control register */ + mrc p15, 0, r10, c1, c0, 1 + bic r10, r10, #2 + mcr p15, 0, r10, c1, c0, 1 + + /* + * Invalidate data cache again. + */ + ldr r1, kernel_flush + blx r1 + /* + * The kernel doesn't interwork: v7_flush_dcache_all in particluar will + * always return in Thumb state when CONFIG_THUMB2_KERNEL is enabled. + * This sequence switches back to ARM. Note that .align may insert a + * nop: bx pc needs to be word-aligned in order to work. + */ + THUMB( .thumb ) + THUMB( .align ) + THUMB( bx pc ) + THUMB( nop ) + .arm + + /* Data memory barrier and Data sync barrier */ + dsb + dmb + +#define SPDCR 0xe6180008 +#define A3SM (1 << 12) + + /* A3SM power down */ + ldr r0, =SPDCR + ldr r1, =A3SM + str r1, [r0] +1: + b 1b + +kernel_flush: + .word v7_flush_dcache_all |