spm.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <assert.h>
#include <console/console.h>
#include <soc/mcu_common.h>
#include <soc/spm.h>
#include <soc/spm_common.h>
#include <string.h>
 
#define SPMFW_HEADER_SIZE 16
 
void spm_parse_firmware(struct mtk_mcu *mcu)
{
        size_t file_size, copy_size;
        int offset;
        u16 firmware_size;
 
        struct dyna_load_pcm *pcm = (struct dyna_load_pcm *)mcu->priv;
        file_size = mcu->run_size;
 
        /*
         * spmfw layout:
         *   u16 firmware_size
         *   u32 binary[firmware_size]
         *   struct pcm_desc descriptor
         *   char *version
         */
 
        /* Firmware size */
        offset = 0;
        copy_size = sizeof(firmware_size);
        memcpy(&firmware_size, mcu->load_buffer + offset, copy_size);
        printk(BIOS_DEBUG, "SPM: binary array size = %#x\n", firmware_size);
 
        /* Binary */
        offset = SPMFW_HEADER_SIZE; /* binary start offset */
        copy_size = firmware_size * sizeof(u32);
        assert(offset < file_size);
        pcm->buf = (u8 *)(mcu->load_buffer + offset);
 
        /* Descriptor */
        offset += copy_size;
        assert(offset < file_size);
        copy_size = sizeof(pcm->desc);
        memcpy(&pcm->desc, mcu->load_buffer + offset, copy_size);
 
        /* Firmware size and total words need to be the same */
        assert(firmware_size == pcm->desc.total_words);
 
        /* Version */
        offset += copy_size;
        assert(offset < file_size);
        printk(BIOS_INFO, "SPM: spmfw (version %.*s)\n",
               (int)(file_size - offset),
               (u8 *)mcu->load_buffer + offset);
}