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>
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index e718350..eaf6bd3 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -215,7 +215,9 @@
tegra20_lp1_iram_hook();
break;
case TEGRA30:
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+ case TEGRA114:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+ IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
tegra30_lp1_iram_hook();
break;
default:
@@ -241,7 +243,9 @@
tegra20_sleep_core_init();
break;
case TEGRA30:
- if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
+ case TEGRA114:
+ if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
+ IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC))
tegra30_sleep_core_init();
break;
default: