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84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "gpio.h"
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#include "mbox.h"
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#include "delays.h"
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#define PM_RSTC ((volatile unsigned int*)(MMIO_BASE+0x0010001c))
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#define PM_RSTS ((volatile unsigned int*)(MMIO_BASE+0x00100020))
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#define PM_WDOG ((volatile unsigned int*)(MMIO_BASE+0x00100024))
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#define PM_WDOG_MAGIC 0x5a000000
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#define PM_RSTC_FULLRST 0x00000020
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/**
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* Shutdown the board
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*/
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void power_off()
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{
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unsigned long r;
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// power off devices one by one
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for(r=0;r<16;r++) {
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mbox[0]=8*4;
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mbox[1]=MBOX_REQUEST;
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mbox[2]=MBOX_TAG_SETPOWER; // set power state
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mbox[3]=8;
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mbox[4]=8;
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mbox[5]=(unsigned int)r; // device id
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mbox[6]=0; // bit 0: off, bit 1: no wait
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mbox[7]=MBOX_TAG_LAST;
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mbox_call(MBOX_CH_PROP);
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}
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// power off gpio pins (but not VCC pins)
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*GPFSEL0 = 0; *GPFSEL1 = 0; *GPFSEL2 = 0; *GPFSEL3 = 0; *GPFSEL4 = 0; *GPFSEL5 = 0;
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*GPPUD = 0;
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wait_cycles(150);
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*GPPUDCLK0 = 0xffffffff; *GPPUDCLK1 = 0xffffffff;
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wait_cycles(150);
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*GPPUDCLK0 = 0; *GPPUDCLK1 = 0; // flush GPIO setup
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// power off the SoC (GPU + CPU)
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r = *PM_RSTS; r &= ~0xfffffaaa;
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r |= 0x555; // partition 63 used to indicate halt
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*PM_RSTS = PM_WDOG_MAGIC | r;
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*PM_WDOG = PM_WDOG_MAGIC | 10;
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*PM_RSTC = PM_WDOG_MAGIC | PM_RSTC_FULLRST;
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}
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/**
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* Reboot
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*/
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void reset()
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{
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unsigned int r;
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// trigger a restart by instructing the GPU to boot from partition 0
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r = *PM_RSTS; r &= ~0xfffffaaa;
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*PM_RSTS = PM_WDOG_MAGIC | r; // boot from partition 0
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*PM_WDOG = PM_WDOG_MAGIC | 10;
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*PM_RSTC = PM_WDOG_MAGIC | PM_RSTC_FULLRST;
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}
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