diff options
| author | Joseph Lo <josephl@nvidia.com> | 2013-08-12 11:40:06 +0200 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-08-12 21:30:12 +0200 |
| commit | e9f624499cc84a625648ccfbd550b74d17d52fb2 (patch) | |
| tree | 5076ecac1bd3a76a902e27535d5bd499d25deb73 /arch/arm/mach-tegra/iomap.h | |
| parent | ARM: tegra: add LP1 suspend support for Tegra20 (diff) | |
| download | linux-e9f624499cc84a625648ccfbd550b74d17d52fb2.tar.xz linux-e9f624499cc84a625648ccfbd550b74d17d52fb2.zip | |
ARM: tegra: add LP1 suspend support for Tegra114
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
* storing some EMC registers, DPD (deep power down) status, clk source of
mselect and SCLK burst policy
* putting SDRAM into self-refresh
* switching CPU to CLK_M (12MHz OSC)
* tunning off PLLM, PLLP, PLLA, PLLC and PLLX
* switching SCLK to CLK_S (32KHz OSC)
* shutting off the CPU rail
The sequence of LP1 resuming:
* re-enabling PLLM, PLLP, PLLA, PLLC and PLLX
* restoring the clk source of mselect and SCLK burst policy
* setting up CCLK burst policy to PLLX
* restoring DPD status and some EMC registers
* 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. 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: Bo Yan <byan@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/iomap.h')
| -rw-r--r-- | arch/arm/mach-tegra/iomap.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/iomap.h b/arch/arm/mach-tegra/iomap.h index f2bdcb4eac94..aba36291d98c 100644 --- a/arch/arm/mach-tegra/iomap.h +++ b/arch/arm/mach-tegra/iomap.h @@ -239,6 +239,12 @@ #define TEGRA_KFUSE_BASE 0x7000FC00 #define TEGRA_KFUSE_SIZE SZ_1K +#define TEGRA_EMC0_BASE 0x7001A000 +#define TEGRA_EMC0_SIZE SZ_2K + +#define TEGRA_EMC1_BASE 0x7001A800 +#define TEGRA_EMC1_SIZE SZ_2K + #define TEGRA_CSITE_BASE 0x70040000 #define TEGRA_CSITE_SIZE SZ_256K |