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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Microchip Technology Inc. and its subsidiaries
*
* Author: Tudor Ambarus <tudor.ambarus@microchip.com>
*/
#include <common.h>
#include <dm.h>
#include <env.h>
#include <linux/mtd/spi-nor.h>
#include <netdev.h>
#define ETH_ADDR_SIZE 6
#ifdef CONFIG_SPI_FLASH_SST
#define SFDP_MICROCHIP_MANUF_ID 0xbf
#define SFDP_MICROCHIP_MEM_TYPE 0x26
#define SFDP_MICROCHIP_DEV_ID 0x43
#define SFDP_MICROCHIP_EUI_OFFSET 0x60
#define SFDP_MICROCHIP_EUI48 0x30
struct sst26vf064beui {
u8 manufacturer_id;
u8 memory_type;
u8 device_id;
u8 reserved;
};
/**
* sst26vf064beui_check() - Check the validity of the EUI-48 information from
* the sst26vf064beui SPI NOR Microchip SFDP table.
* @manufacturer_sfdp: pointer to the Microchip manufacturer specific SFDP
* table.
*
* Return: 0 on success, -errno otherwise.
*/
static int sst26vf064beui_check(const u8 *manufacturer_sfdp)
{
struct sst26vf064beui *sst26vf064beui =
(struct sst26vf064beui *)manufacturer_sfdp;
if (sst26vf064beui->manufacturer_id != SFDP_MICROCHIP_MANUF_ID)
return -EINVAL;
if (sst26vf064beui->memory_type != SFDP_MICROCHIP_MEM_TYPE)
return -EINVAL;
if (sst26vf064beui->device_id != SFDP_MICROCHIP_DEV_ID)
return -EINVAL;
/*
* Check if the EUI-48 MAC address is programmed in the next six address
* locations.
*/
if (manufacturer_sfdp[SFDP_MICROCHIP_EUI_OFFSET] !=
SFDP_MICROCHIP_EUI48)
return -EINVAL;
return 0;
}
/**
* sst26vf064beui_get_ethaddr() - Get the ethernet address from the
* sst26vf064beui SPI NOR Microchip SFDP table.
* @manufacturer_sfdp: pointer to the Microchip manufacturer specific SFDP
* table.
* @ethaddr: pointer where to fill the ethernet address
* @size: size of the ethernet address.
*
* Return: 0 on success, -errno otherwise.
*/
static int sst26vf064beui_get_ethaddr(const u8 *manufacturer_sfdp,
u8 *ethaddr, size_t size)
{
u64 eui_table[2];
u64 *p = (u64 *)&manufacturer_sfdp[SFDP_MICROCHIP_EUI_OFFSET];
int i, ret;
ret = sst26vf064beui_check(manufacturer_sfdp);
if (ret)
return ret;
for (i = 0; i < 2; i++)
eui_table[i] = le64_to_cpu(p[i]);
/* Ethaddr starts at offset one. */
memcpy(ethaddr, &((u8 *)eui_table)[1], size);
return 0;
}
#endif
/**
* at91_spi_nor_set_ethaddr() - Retrieve and set the ethernet address from the
* SPI NOR manufacturer specific SFDP table.
*/
void at91_spi_nor_set_ethaddr(void)
{
struct udevice *dev;
struct spi_nor *nor;
const char *ethaddr_name = "ethaddr";
u8 ethaddr[ETH_ADDR_SIZE] = {0};
if (env_get(ethaddr_name))
return;
if (uclass_first_device_err(UCLASS_SPI_FLASH, &dev))
return;
nor = dev_get_uclass_priv(dev);
if (!nor)
return;
if (!nor->manufacturer_sfdp)
return;
#ifdef CONFIG_SPI_FLASH_SST
if (sst26vf064beui_get_ethaddr(nor->manufacturer_sfdp, ethaddr,
ETH_ADDR_SIZE))
return;
#endif
if (is_valid_ethaddr(ethaddr))
eth_env_set_enetaddr(ethaddr_name, ethaddr);
}
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