kfuse.c

/*
 * Copyright (c) 2018 naehrwert
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <soc/kfuse.h>
#include <soc/clock.h>
#include <soc/t210.h>

int kfuse_wait_ready()
{
	// Wait for KFUSE to finish init and verification of data.
	while (!(KFUSE(KFUSE_STATE) & KFUSE_STATE_DONE))
		;

	if (!(KFUSE(KFUSE_STATE) & KFUSE_STATE_CRCPASS))
		return 0;

	return 1;
}

int kfuse_read(u32 *buf)
{
	int res = 0;

	clock_enable_kfuse();

	if (!kfuse_wait_ready())
		goto out;

	KFUSE(KFUSE_KEYADDR) = KFUSE_KEYADDR_AUTOINC;
	for (int i = 0; i < KFUSE_NUM_WORDS; i++)
		buf[i] = KFUSE(KFUSE_KEYS);

	res = 1;

out:
	clock_disable_kfuse();
	return res;
}