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