portapack-mayhem/firmware/application/core_control.cpp

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2023 Bernd Herzog
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "baseband_api.hpp"
#include "core_control.hpp"
#include "hal.h"
#include "lpc43xx_cpp.hpp"
#include "lz4.h"
#include "message.hpp"

#include <cstring>

using namespace lpc43xx;
using namespace portapack;

void m4_init(const spi_flash::image_tag_t image_tag, const memory::region_t to, const bool full_reset) {
    const spi_flash::chunk_t* chunk = reinterpret_cast<const spi_flash::chunk_t*>(spi_flash::images.base());
    while (chunk->tag) {
        if (chunk->tag == image_tag) {
            const void* src = &chunk->data[0];
            void* dst = reinterpret_cast<void*>(to.base());

            /* extract and initialize M4 code RAM */
            unlz4_len(src, dst, chunk->compressed_data_size);

            /* M4 core is assumed to be sleeping with interrupts off, so we can mess
             * with its address space and RAM without concern.
             */
            LPC_CREG->M4MEMMAP = to.base();

            /* Reset M4 core and optionally all peripherals */
            LPC_RGU->RESET_CTRL[0] = (full_reset) ? (1 << 1)    // PERIPH_RST
                                                  : (1 << 13);  // M4_RST

            return;
        }
        chunk = chunk->next();
    }

    chDbgPanic("NoImg");
}

void m4_init_prepared(const uint32_t m4_code, const bool full_reset) {
    /* M4 core is assumed to be sleeping with interrupts off, so we can mess
     * with its address space and RAM without concern.
     */
    LPC_CREG->M4MEMMAP = m4_code;

    /* Reset M4 core and optionally all peripherals */
    LPC_RGU->RESET_CTRL[0] = (full_reset) ? (1 << 1)    // PERIPH_RST
                                          : (1 << 13);  // M4_RST

    return;
}

void m4_request_shutdown() {
    baseband::shutdown();
}

void m0_halt() {
    rgu::reset(rgu::Reset::M0APP);
    while (true) {
        port_wait_for_interrupt();
    }
}