diff options
Diffstat (limited to 'arch/arm/mach-tegra/sleep-tegra30.S')
| -rw-r--r-- | arch/arm/mach-tegra/sleep-tegra30.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index 59984d718481..562a8e7e413d 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -124,4 +124,48 @@ ENTRY(tegra30_sleep_cpu_secondary_finish) mov r0, #1 @ never return here mov pc, r7 ENDPROC(tegra30_sleep_cpu_secondary_finish) + +/* + * tegra30_tear_down_cpu + * + * Switches the CPU to enter sleep. + */ +ENTRY(tegra30_tear_down_cpu) + mov32 r6, TEGRA_FLOW_CTRL_BASE + + b tegra30_enter_sleep +ENDPROC(tegra30_tear_down_cpu) + +/* + * tegra30_enter_sleep + * + * uses flow controller to enter sleep state + * executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1 + * executes from SDRAM with target state is LP2 + * r6 = TEGRA_FLOW_CTRL_BASE + */ +tegra30_enter_sleep: + cpu_id r1 + + cpu_to_csr_reg r2, r1 + ldr r0, [r6, r2] + orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG + orr r0, r0, #FLOW_CTRL_CSR_ENABLE + str r0, [r6, r2] + + mov r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT + orr r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ + cpu_to_halt_reg r2, r1 + str r0, [r6, r2] + dsb + ldr r0, [r6, r2] /* memory barrier */ + +halted: + isb + dsb + wfi /* CPU should be power gated here */ + + /* !!!FIXME!!! Implement halt failure handler */ + b halted + #endif |