111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
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* This file is part of open_agb_firm
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* Copyright (C) 2021 derrek, profi200
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdatomic.h>
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#include "arm11/drivers/mcu.h"
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#include "arm11/drivers/i2c.h"
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#include "arm11/drivers/interrupt.h"
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#include "arm11/drivers/gpio.h"
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static bool g_mcuIrq = false;
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static u32 g_mcuEvents = 0;
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static void mcuIrqHandler(UNUSED u32 intSource);
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u8 MCU_readReg(McuReg reg)
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{
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return I2C_readReg(I2C_DEV_CTR_MCU, reg);
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}
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bool MCU_writeReg(McuReg reg, u8 data)
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{
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return I2C_writeReg(I2C_DEV_CTR_MCU, reg, data);
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}
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bool MCU_readRegBuf(McuReg reg, u8 *out, u32 size)
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{
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return I2C_readRegBuf(I2C_DEV_CTR_MCU, reg, out, size);
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}
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bool MCU_writeRegBuf(McuReg reg, const u8 *const in, u32 size)
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{
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return I2C_writeRegBuf(I2C_DEV_CTR_MCU, reg, in, size);
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}
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void MCU_init(void)
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{
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static bool inited = false;
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if(inited) return;
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inited = true;
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I2C_init();
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// Configure GPIO for MCU event IRQs
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GPIO_config(GPIO_3_MCU, GPIO_INPUT | GPIO_EDGE_FALLING | GPIO_IRQ_ENABLE);
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IRQ_registerIsr(IRQ_CTR_MCU, 14, 0, mcuIrqHandler);
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atomic_store_explicit(&g_mcuIrq, true, memory_order_relaxed);
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(void)MCU_getEvents(0);
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MCU_setEventMask(0xC0BF3F80);
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}
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static void mcuIrqHandler(UNUSED u32 intSource)
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{
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g_mcuIrq = true;
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}
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bool MCU_setEventMask(u32 mask)
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{
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return MCU_writeRegBuf(MCU_REG_EVENT_MASK, (const u8*)&mask, 4);
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}
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u32 MCU_getEvents(u32 mask)
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{
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u32 events = g_mcuEvents;
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if(atomic_load_explicit(&g_mcuIrq, memory_order_relaxed))
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{
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atomic_store_explicit(&g_mcuIrq, false, memory_order_relaxed);
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u32 data;
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if(!MCU_readRegBuf(MCU_REG_EVENTS, (u8*)&data, 4)) return 0;
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events |= data;
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}
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g_mcuEvents = events & ~mask;
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return events & mask;
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}
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u32 MCU_waitEvents(u32 mask)
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{
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u32 events;
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while((events = MCU_getEvents(mask)) == 0u)
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{
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__wfi();
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}
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return events;
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}
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