From e7a932b1961c3936c7ae5b8d1628f39dc50a746d Mon Sep 17 00:00:00 2001 From: Joseph Lo Date: Mon, 12 Aug 2013 17:40:04 +0800 Subject: ARM: tegra: add LP1 suspend support for Tegra30 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, CCLK burst policy be set in PLLX. 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: Scott Williams Signed-off-by: Joseph Lo Signed-off-by: Stephen Warren --- arch/arm/mach-tegra/pm.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/arm/mach-tegra/pm.h') diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h index 478706edebbe..803bd5382257 100644 --- a/arch/arm/mach-tegra/pm.h +++ b/arch/arm/mach-tegra/pm.h @@ -30,6 +30,9 @@ struct tegra_lp1_iram { extern struct tegra_lp1_iram tegra_lp1_iram; extern void (*tegra_sleep_core_finish)(unsigned long v2p); +void tegra30_lp1_iram_hook(void); +void tegra30_sleep_core_init(void); + extern unsigned long l2x0_saved_regs_addr; void save_cpu_arch_register(void); -- cgit