mtc.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <boot/coreboot_tables.h>
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include <soc/mtc.h>
#include <string.h>
 
static size_t mtc_table_size;
 
#define MAX_MTC_TABLE_ENTRIES   20
#define MTC_TABLE_ENTRY_SIZE    4880
#define MTC_TABLE_MAX_SIZE      (MAX_MTC_TABLE_ENTRIES * MTC_TABLE_ENTRY_SIZE)
 
int tegra210_run_mtc(void)
{
        size_t nread;
        void *const mtc = (void *)(uintptr_t)CONFIG_MTC_ADDRESS;
        void *dvfs_table;
        size_t (*mtc_fw)(void **dvfs_table) = (void *)mtc;
 
        nread = cbfs_load("tegra_mtc.bin", mtc, 1*GiB);
        if (!nread) {
                printk(BIOS_ERR, "MTC file not found: tegra_mtc.bin\n");
                return -1;
        }
 
        printk(BIOS_INFO, "MTC: %zu bytes loaded @ %p\n", nread, mtc);
 
        mtc_table_size = (*mtc_fw)(&dvfs_table);
 
        if ((mtc_table_size == 0) || (mtc_table_size > MTC_TABLE_MAX_SIZE)) {
                printk(BIOS_ERR, "MTC Training table size is invalid.!\n");
                return -1;
        }
 
        printk(BIOS_INFO, "MTC: Done. Entries size 0x%zx located at %p\n",
               mtc_table_size, dvfs_table);
 
        void *cbmem_tab = cbmem_add(CBMEM_ID_MTC, mtc_table_size);
        if (cbmem_tab == NULL) {
                printk(BIOS_ERR, "MTC table allocation in cbmem failed!\n");
                return -1;
        }
 
        memcpy(cbmem_tab, dvfs_table, mtc_table_size);
        printk(BIOS_INFO, "MTC: Copied 0x%zx bytes from %p to %p\n",
               mtc_table_size, dvfs_table, cbmem_tab);
 
        return 0;
}
 
void soc_add_mtc(struct lb_header *header)
{
        struct lb_range *mtc;
        mtc = (struct lb_range *)lb_new_record(header);
        mtc->tag = LB_TAG_MTC;
        mtc->size = sizeof(*mtc);
 
        mtc->range_start = (uintptr_t)cbmem_find(CBMEM_ID_MTC);
        mtc->range_size = mtc_table_size;
}