diff options
| author | Joseph Lo <josephl@nvidia.com> | 2013-08-12 11:40:05 +0200 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-08-12 21:30:11 +0200 |
| commit | 731a9274382f8e6f4961df79fe12ebcc5431a5df (patch) | |
| tree | e46be9d206edf67c0bb3ec211489b98266aff827 /arch/arm/mach-tegra/Makefile | |
| parent | ARM: tegra: add LP1 suspend support for Tegra30 (diff) | |
| download | linux-731a9274382f8e6f4961df79fe12ebcc5431a5df.tar.xz linux-731a9274382f8e6f4961df79fe12ebcc5431a5df.zip | |
ARM: tegra: add LP1 suspend support for Tegra20
The LP1 suspend mode will power off the CPU, clock gated the PLLs and put
SDRAM to self-refresh mode. Any interrupt can wake up device from LP1. The
sequence when LP1 suspending:
* tunning off L1 data cache and the MMU
* putting SDRAM into self-refresh
* storing some EMC registers and SCLK burst policy
* switching CPU to CLK_M (12MHz OSC)
* switching SCLK to CLK_S (32KHz OSC)
* tunning off PLLM, PLLP and PLLC
* shutting off the CPU rail
The sequence of LP1 resuming:
* re-enabling PLLM, PLLP, and PLLC
* restoring some EMC registers and SCLK burst policy
* setting up CCLK burst policy to PLLP
* resuming SDRAM to normal mode
* jumping to the "tegra_resume" from PMC_SCRATCH41
Due to the SDRAM will be put into self-refresh mode, the low level
procedures of LP1 suspending and resuming should be copied to
TEGRA_IRAM_CODE_AREA (TEGRA_IRAM_BASE + SZ_4K) when suspending. Before
restoring the CPU context when resuming, the SDRAM needs to be switched
back to normal mode. And the PLLs need to be re-enabled, SCLK burst policy
be restored, CCLK burst policy be set in PLLP. Then jumping to
"tegra_resume" that was expected to be stored in PMC_SCRATCH41 to restore
CPU context and back to kernel.
Based on the work by:
Colin Cross <ccross@android.com>
Gary King <gking@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/Makefile')
| -rw-r--r-- | arch/arm/mach-tegra/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile index d341980d5ca9..a3fe22d5b06a 100644 --- a/arch/arm/mach-tegra/Makefile +++ b/arch/arm/mach-tegra/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra20_speedo.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_emc.o obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += sleep-tegra20.o +obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += pm-tegra20.o ifeq ($(CONFIG_CPU_IDLE),y) obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += cpuidle-tegra20.o endif |