103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
#include "kernel/kernel.h"
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#include <unistd.h>
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#include <ctype.h>
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#include <string.h>
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#include <machine/cpu.h>
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#include <assert.h>
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#include <signal.h>
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#include <machine/vm.h>
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#include <io.h>
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#include <minix/reboot.h>
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#include <minix/board.h>
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#include <minix/u64.h>
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#include "archconst.h"
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#include "arch_proto.h"
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#include "serial.h"
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#include "omap_rtc.h"
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#include "omap_reset.h"
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#include "kernel/proc.h"
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#include "kernel/debug.h"
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#include "direct_utils.h"
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#include <machine/multiboot.h>
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void
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halt_cpu(void)
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{
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asm volatile("dsb");
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asm volatile("cpsie i");
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asm volatile("wfi");
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asm volatile("cpsid i");
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}
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void
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reset(void)
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{
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omap3_reset();
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direct_print("Reset not supported.");
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while (1);
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}
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void
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poweroff(void)
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{
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/*
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* The am335x can signal an external power management chip to cut the power
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* by toggling the PMIC_POWER_EN pin. It might fail if there isn't an
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* external PMIC or if the PMIC hasn't been configured to respond to toggles.
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* The only way to pull the pin low is via ALARM2 (see TRM 20.3.3.8).
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* At this point PM should have already signaled readclock to set the alarm.
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*/
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if (BOARD_IS_BB(machine.board_id)) {
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/* Powers down the SoC within 3 seconds */
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direct_print("PMIC Power-Off in 3 Seconds\n");
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/* rtc was frozen to prevent premature power-off, unfreeze it now */
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omap3_rtc_run();
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/* wait for the alarm to go off and PMIC to disable power to SoC */
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while (1);
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}
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/* fallback option: hang */
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direct_print("Unable to power-off this device.");
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while (1);
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}
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__dead void
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arch_shutdown(int how)
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{
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switch (how) {
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case RBT_HALT:
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/* Hang */
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for (; ; ) halt_cpu();
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NOT_REACHABLE;
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case RBT_POWEROFF:
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/* Power off if possible, hang otherwise */
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poweroff();
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NOT_REACHABLE;
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default:
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case RBT_DEFAULT:
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case RBT_REBOOT:
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case RBT_RESET:
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/* Reset the system */
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reset();
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NOT_REACHABLE;
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}
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while (1);
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}
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#ifdef DEBUG_SERIAL
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void
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ser_putc(char c)
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{
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omap3_ser_putc(c);
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}
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#endif
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