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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <dm.h>
#include <env.h>
#include <init.h>
#include <log.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/delay.h>
#include <misc.h>
#include <spl.h>
#include <asm/arch/cache.h>
/*
* This define is a value used for error/unknown serial.
* If we really care about distinguishing errors and 0 is
* valid, we'll need a different one.
*/
#define ERROR_READING_SERIAL_NUMBER 0
#ifdef CONFIG_MISC_INIT_R
#if CONFIG_IS_ENABLED(SIFIVE_OTP)
static u32 otp_read_serialnum(struct udevice *dev)
{
int ret;
u32 serial[2] = {0};
for (int i = 0xfe * 4; i > 0; i -= 8) {
ret = misc_read(dev, i, serial, sizeof(serial));
if (ret != sizeof(serial)) {
printf("%s: error reading serial from OTP\n", __func__);
break;
}
if (serial[0] == ~serial[1])
return serial[0];
}
return ERROR_READING_SERIAL_NUMBER;
}
#endif
static u32 fu540_read_serialnum(void)
{
u32 serial = ERROR_READING_SERIAL_NUMBER;
#if CONFIG_IS_ENABLED(SIFIVE_OTP)
struct udevice *dev;
int ret;
/* init OTP */
ret = uclass_get_device_by_driver(UCLASS_MISC,
DM_GET_DRIVER(sifive_otp), &dev);
if (ret) {
debug("%s: could not find otp device\n", __func__);
return serial;
}
/* read serial from OTP and set env var */
serial = otp_read_serialnum(dev);
#endif
return serial;
}
static void fu540_setup_macaddr(u32 serialnum)
{
/* Default MAC address */
unsigned char mac[6] = { 0x70, 0xb3, 0xd5, 0x92, 0xf0, 0x00 };
/*
* We derive our board MAC address by ORing last three bytes
* of board serial number to above default MAC address.
*
* This logic of deriving board MAC address is taken from
* SiFive FSBL and is kept unchanged.
*/
mac[5] |= (serialnum >> 0) & 0xff;
mac[4] |= (serialnum >> 8) & 0xff;
mac[3] |= (serialnum >> 16) & 0xff;
/* Update environment variable */
eth_env_set_enetaddr("ethaddr", mac);
}
int misc_init_r(void)
{
u32 serial_num;
char buf[9] = {0};
/* Set ethaddr environment variable from board serial number */
if (!env_get("serial#")) {
serial_num = fu540_read_serialnum();
if (!serial_num) {
WARN(true, "Board serial number should not be 0 !!\n");
return 0;
}
snprintf(buf, sizeof(buf), "%08x", serial_num);
env_set("serial#", buf);
fu540_setup_macaddr(serial_num);
}
return 0;
}
#endif
int board_init(void)
{
int ret;
/* enable all cache ways */
ret = cache_enable_ways();
if (ret) {
debug("%s: could not enable cache ways\n", __func__);
return ret;
}
return 0;
}
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