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echoplayer: implement reboot using RTC_OUT pin
Change-Id: Ibeda362030c2885abe1366fb3256e925ea27538c
This commit is contained in:
Aidan MacDonald
Solomon Peachy
parent
6035b1fc1b
commit
319fdcc506
4 changed files with 99 additions and 9 deletions
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@ -587,6 +587,10 @@ RTC @ 0x58004000 : block {
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14 00 PREDIV_S
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}
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WUTR @ 0x14 : reg {
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15 00 VALUE
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}
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WPR @ 0x24 : reg {
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07 00 KEY : { 0xCA = KEY1; 0x53 = KEY2 }
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}
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@ -21,6 +21,8 @@
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#include "power.h"
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#include "mutex.h"
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#include "gpio-stm32h7.h"
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#include "system-echoplayer.h"
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#include "regs/cortex-m/cm_scb.h"
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static struct mutex power_1v8_lock;
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static int power_1v8_refcount;
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@ -68,23 +70,34 @@ void power_init(void)
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void power_off(void)
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{
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/*
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* Disable power and reset to the bootloader immediately.
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* The system can't really be powered off as long as USB
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* is plugged or the power button is pressed -- it's the
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* bootloader's job to monitor those inputs and decide
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* when the system needs to "really" power on.
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*/
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gpio_set_level(GPIO_CPU_POWER_ON, 0);
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/* TODO: reset to bootloader if USB is plugged in */
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while (1)
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core_idle();
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reg_writef(CM_SCB_AIRCR, VECTKEY_V(KEY), SYSRESETREQ(1));
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while (1);
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}
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void system_reboot(void)
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{
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/*
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* TODO: support reboot
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*
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* For R1-Rev1 PCBs doing a CPU reset will cut power when
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* running on battery (because cpu_power_on is no longer
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* being driven high). The RTC alarm could be used to wake
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* the system instead.
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* Disable IRQs to ensure an errant panic can't disturb
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* the RTC reconfig.
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*/
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disable_irq();
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/*
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* Configure RTC_OUT pin to keep power enabled during
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* reset and then do a normal power off. If this fails
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* to reset back to the bootloader then the RTC_OUT
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* pin will go low automatically after some timeout.
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*/
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echoplayer_set_rtcout_mode(ECHOPLAYER_RTCOUT_REBOOT);
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power_off();
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}
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@ -22,8 +22,11 @@
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#include "button.h"
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#include "gpio-stm32h7.h"
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#include "clock-echoplayer.h"
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#include "system-echoplayer.h"
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#include "regs/stm32h743/fmc.h"
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#include "regs/stm32h743/pwr.h"
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#include "regs/stm32h743/rcc.h"
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#include "regs/stm32h743/rtc.h"
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#include "regs/cortex-m/cm_scb.h"
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#define F_INPUT GPIOF_INPUT(GPIO_PULL_DISABLED)
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@ -207,9 +210,47 @@ void system_init(void)
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/* Configure GPIOs and start FMC */
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gpio_init();
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fmc_init();
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/* Disable RTC_OUT pin */
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echoplayer_set_rtcout_mode(ECHOPLAYER_RTCOUT_DISABLED);
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}
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void system_exception_wait(void)
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{
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while (button_read_device() != (BUTTON_POWER | BUTTON_START));
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}
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void echoplayer_set_rtcout_mode(enum echoplayer_rtcout_mode mode)
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{
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reg_writef(RCC_APB4ENR, RTCAPBEN(1));
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reg_writef(PWR_CR1, DBP(1));
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reg_writef(RTC_WPR, KEY_V(KEY1));
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reg_writef(RTC_WPR, KEY_V(KEY2));
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reg_writef(RTC_OR, OUT_RMP(0), ALARM_TYPE_V(PUSH_PULL));
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switch (mode)
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{
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case ECHOPLAYER_RTCOUT_REBOOT:
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/*
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* Use the inverted wakeup timer output to keep power
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* enabled during reset. If, somehow, the system does
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* not reset properly then the wakeup timer will drive
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* the RTC_OUT pin low after 1 second and cut power.
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*/
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while (!reg_readf(RTC_ISR, WUTWF));
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reg_writef(RTC_ISR, WUTF(0));
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reg_writef(RTC_WUTR, VALUE(STM32_LSE_FREQ / 8));
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reg_writef(RTC_CR, OSEL_V(WAKEUP), POL(1), WUCKSEL(0), WUTE(1));
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break;
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case ECHOPLAYER_RTCOUT_DISABLED:
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default:
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reg_writef(RTC_CR, OSEL_V(DISABLED), POL(0), WUTE(0));
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break;
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}
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reg_writef(RTC_WPR, KEY(0));
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reg_writef(PWR_CR1, DBP(0));
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}
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32
firmware/target/arm/stm32/echoplayer/system-echoplayer.h
Normal file
32
firmware/target/arm/stm32/echoplayer/system-echoplayer.h
Normal file
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@ -0,0 +1,32 @@
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2026 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __SYSTEM_ECHOPLAYER_H__
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#define __SYSTEM_ECHOPLAYER_H__
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enum echoplayer_rtcout_mode
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{
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ECHOPLAYER_RTCOUT_DISABLED,
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ECHOPLAYER_RTCOUT_REBOOT,
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};
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void echoplayer_set_rtcout_mode(enum echoplayer_rtcout_mode mode);
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#endif /* __SYSTEM_ECHOPLAYER_H__ */
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