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/*
* arch/arm/cpu/armv8/cpu_id.c
*
* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
*
* 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 of the License, 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <common.h>
#include <asm/arch/cpu_id.h>
#include <asm/arch/secure_apb.h>
#include <asm/arch/io.h>
/**
* TODO: This should be moved to a RO region of registers or SRAM that
* provides static system information that's needed across all software
*
* Chip ID copy to avoid unnecessary message exchange.
*/
chip_id_t aml_chip_id = { 0, { 0 } };
cpu_id_t get_cpu_id(void)
{
cpu_id_t cpu_id;
unsigned int cpu_id_reg = readl(P_AO_SEC_SD_CFG8);
memset(&cpu_id, 0, sizeof(cpu_id_t));
cpu_id.family_id = (cpu_id_reg >> 24) & (0XFF);
cpu_id.package_id = (cpu_id_reg >> 16) & (0XF0);
cpu_id.chip_rev = (cpu_id_reg >> 8) & (0XFF);
cpu_id.layout_ver = (cpu_id_reg) & (0XF);
return cpu_id;
}
int get_chip_id(unsigned char *buff, unsigned int size)
{
int rc = 0;
if (buff == NULL || size < 16)
return -1;
if (aml_chip_id.version == 0) {
/* Chip ID has not been fetched yet */
rc = __get_chip_id(&aml_chip_id.chipid[0], 16);
/* Mark version if chip ID is fetched successfully */
if (rc == 0)
aml_chip_id.version = 2;
}
memcpy(buff, &aml_chip_id.chipid[0], 16);
return rc;
}