#include "kernel/kernel.h" #include #include #include #include #include #include #include #include #include #include #include #include "archconst.h" #include "arch_proto.h" #include "serial.h" #include "omap_rtc.h" #include "omap_reset.h" #include "kernel/proc.h" #include "kernel/debug.h" #include "direct_utils.h" #include void halt_cpu(void) { asm volatile("dsb"); asm volatile("cpsie i"); asm volatile("wfi"); asm volatile("cpsid i"); } void reset(void) { omap3_reset(); direct_print("Reset not supported."); while (1); } void poweroff(void) { /* * The am335x can signal an external power management chip to cut the power * by toggling the PMIC_POWER_EN pin. It might fail if there isn't an * external PMIC or if the PMIC hasn't been configured to respond to toggles. * The only way to pull the pin low is via ALARM2 (see TRM 20.3.3.8). * At this point PM should have already signaled readclock to set the alarm. */ if (BOARD_IS_BB(machine.board_id)){ /* Powers down the SoC within 3 seconds */ direct_print("PMIC Power-Off in 3 Seconds\n"); /* rtc was frozen to prevent premature power-off, unfreeze it now */ omap3_rtc_run(); /* wait for the alarm to go off and PMIC to disable power to SoC */ while (1); } /* fallback option: hang */ direct_print("Unable to power-off this device."); while (1); } __dead void arch_shutdown(int how) { switch (how) { case RBT_HALT: /* Hang */ for (; ; ) halt_cpu(); NOT_REACHABLE; case RBT_POWEROFF: /* Power off if possible, hang otherwise */ poweroff(); NOT_REACHABLE; default: case RBT_DEFAULT: case RBT_REBOOT: case RBT_RESET: /* Reset the system */ reset(); NOT_REACHABLE; } while (1); } #ifdef DEBUG_SERIAL void ser_putc(char c) { omap3_ser_putc(c); } #endif