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| author | Joseph Lo <josephl@nvidia.com> | 2013-07-19 17:25:25 +0800 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-07-19 10:07:14 -0600 |
| commit | 1b9e6b2745621984b4aad49b0386814815fb15e7 (patch) | |
| tree | 3b258ce7b8cdfe8cfb3c06d120bbba4dbedfcf70 | |
| parent | 7e8b15dbc392cf3097f2d2e6dfbbf2e97318c553 (diff) | |
| download | blackbird-op-linux-1b9e6b2745621984b4aad49b0386814815fb15e7.tar.gz blackbird-op-linux-1b9e6b2745621984b4aad49b0386814815fb15e7.zip | |
ARM: tegra114: add low level support for CPU idle powered-down mode
The flow controller would take care the power sequence when CPU idle in
powered-down mode. It powered gate the CPU when CPU runs into WFI
instruction. And wake up the CPU when event be triggered.
The sequence is below.
* setting wfi bitmap for the CPU as the halt event in the
FLOW_CTRL_CPU_HALT_REG to monitor the CPU running into WFI,then power
gate it
* setting IRQ and FIQ as wake up event to wake up CPU when event triggered
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
| -rw-r--r-- | arch/arm/mach-tegra/flowctrl.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep-tegra30.S | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/flowctrl.h b/arch/arm/mach-tegra/flowctrl.h index 7a29bae799a7..e56a950920f6 100644 --- a/arch/arm/mach-tegra/flowctrl.h +++ b/arch/arm/mach-tegra/flowctrl.h @@ -28,6 +28,8 @@ #define FLOW_CTRL_SCLK_RESUME (1 << 27) #define FLOW_CTRL_HALT_CPU_IRQ (1 << 10) #define FLOW_CTRL_HALT_CPU_FIQ (1 << 8) +#define FLOW_CTRL_HALT_GIC_IRQ (1 << 9) +#define FLOW_CTRL_HALT_GIC_FIQ (1 << 8) #define FLOW_CTRL_CPU0_CSR 0x8 #define FLOW_CTRL_CSR_INTR_FLAG (1 << 15) #define FLOW_CTRL_CSR_EVENT_FLAG (1 << 14) diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index ada8821b48be..5877f268fa97 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -99,6 +99,8 @@ flow_ctrl_setting_for_lp2: cmp r10, #TEGRA30 moveq r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT @ For LP2 movne r3, #FLOW_CTRL_WAITEVENT + orrne r3, r3, #FLOW_CTRL_HALT_GIC_IRQ + orrne r3, r3, #FLOW_CTRL_HALT_GIC_FIQ flow_ctrl_done: cmp r10, #TEGRA30 str r3, [r2] |
