src/soc/nvidia/tegra210/mtc.c

/* 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;
}