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| author | Joseph Lo <josephl@nvidia.com> | 2012-10-31 13:41:17 +0400 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2012-11-16 02:09:21 +0400 |
| commit | d457ef358f3c7179c428becda45b1dfd2b8cf98a (patch) | |
| tree | 90299ea88a7fb8ebe02cb2cd45160db13afe6775 /arch/arm/mach-tegra/sleep-tegra30.S | |
| parent | d3f293656c07a1147c11e8c8774d7955a903cee0 (diff) | |
| download | linux-d457ef358f3c7179c428becda45b1dfd2b8cf98a.tar.xz | |
ARM: tegra30: cpuidle: add powered-down state for secondary CPUs
This supports power-gated idle on secondary CPUs for Tegra30. The
secondary CPUs can go into powered-down state independently. When
CPU goes into this state, it saves it's contexts and puts itself
to flow controlled WFI state. After that, it will been power gated.
Be aware of that, you may see the legacy power state "LP2" in the
code which is exactly the same meaning of "CPU power down".
Based on the work by:
Scott Williams <scwilliams@nvidia.com>
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/sleep-tegra30.S')
| -rw-r--r-- | arch/arm/mach-tegra/sleep-tegra30.S | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index be7614b7c5cb..59984d718481 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -17,6 +17,7 @@ #include <linux/linkage.h> #include <asm/assembler.h> +#include <asm/asm-offsets.h> #include "sleep.h" #include "flowctrl.h" @@ -80,6 +81,7 @@ delay_1: ldr r3, [r1] @ read CSR str r3, [r1] @ clear CSR tst r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN + moveq r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT @ For LP2 movne r3, #FLOW_CTRL_WAITEVENT @ For hotplug str r3, [r2] ldr r0, [r2] @@ -103,3 +105,23 @@ wfe_war: ENDPROC(tegra30_cpu_shutdown) #endif + +#ifdef CONFIG_PM_SLEEP +/* + * tegra30_sleep_cpu_secondary_finish(unsigned long v2p) + * + * Enters LP2 on secondary CPU by exiting coherency and powergating the CPU. + */ +ENTRY(tegra30_sleep_cpu_secondary_finish) + mov r7, lr + + /* Flush and disable the L1 data cache */ + bl tegra_disable_clean_inv_dcache + + /* Powergate this CPU. */ + mov r0, #0 @ power mode flags (!hotplug) + bl tegra30_cpu_shutdown + mov r0, #1 @ never return here + mov pc, r7 +ENDPROC(tegra30_sleep_cpu_secondary_finish) +#endif |