| /* |
| * Low-level Power Management code. |
| * |
| * Copyright (C) 2008 Atmel Corporation |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <asm/asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/thread_info.h> |
| #include <asm/arch/pm.h> |
| |
| .section .bss, "wa", @nobits |
| .global disable_idle_sleep |
| .type disable_idle_sleep, @object |
| disable_idle_sleep: |
| .int 4 |
| .size disable_idle_sleep, . - disable_idle_sleep |
| |
| /* Keep this close to the irq handlers */ |
| .section .irq.text, "ax", @progbits |
| |
| /* |
| * void cpu_enter_idle(void) |
| * |
| * Put the CPU into "idle" mode, in which it will consume |
| * significantly less power. |
| * |
| * If an interrupt comes along in the window between |
| * unmask_interrupts and the sleep instruction below, the |
| * interrupt code will adjust the return address so that we |
| * never execute the sleep instruction. This is required |
| * because the AP7000 doesn't unmask interrupts when entering |
| * sleep modes; later CPUs may not need this workaround. |
| */ |
| .global cpu_enter_idle |
| .type cpu_enter_idle, @function |
| cpu_enter_idle: |
| mask_interrupts |
| get_thread_info r8 |
| ld.w r9, r8[TI_flags] |
| bld r9, TIF_NEED_RESCHED |
| brcs .Lret_from_sleep |
| sbr r9, TIF_CPU_GOING_TO_SLEEP |
| st.w r8[TI_flags], r9 |
| unmask_interrupts |
| sleep CPU_SLEEP_IDLE |
| .size cpu_idle_sleep, . - cpu_idle_sleep |
| |
| /* |
| * Common return path for PM functions that don't run from |
| * SRAM. |
| */ |
| .global cpu_idle_skip_sleep |
| .type cpu_idle_skip_sleep, @function |
| cpu_idle_skip_sleep: |
| mask_interrupts |
| ld.w r9, r8[TI_flags] |
| cbr r9, TIF_CPU_GOING_TO_SLEEP |
| st.w r8[TI_flags], r9 |
| .Lret_from_sleep: |
| unmask_interrupts |
| retal r12 |
| .size cpu_idle_skip_sleep, . - cpu_idle_skip_sleep |
