From e9f624499cc84a625648ccfbd550b74d17d52fb2 Mon Sep 17 00:00:00 2001 From: Joseph Lo Date: Mon, 12 Aug 2013 17:40:06 +0800 Subject: 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 Signed-off-by: Joseph Lo Signed-off-by: Stephen Warren --- arch/arm/mach-tegra/iomap.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm/mach-tegra/iomap.h') 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 -- cgit