u-boot/board/xilinx/common/board.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2014 - 2020 Xilinx, Inc.
 * Michal Simek <michal.simek@xilinx.com>
 */

#include <common.h>
#include <env.h>
#include <log.h>
#include <asm/sections.h>
#include <dm/uclass.h>
#include <i2c.h>
#include <linux/sizes.h>
#include <malloc.h>
#include "board.h"
#include <dm.h>
#include <i2c_eeprom.h>
#include <net.h>

#if defined(CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET)
int zynq_board_read_rom_ethaddr(unsigned char *ethaddr)
{
	int ret = -EINVAL;
	struct udevice *dev;
	ofnode eeprom;

	eeprom = ofnode_get_chosen_node("xlnx,eeprom");
	if (!ofnode_valid(eeprom))
		return -ENODEV;

	debug("%s: Path to EEPROM %s\n", __func__,
	      ofnode_read_chosen_string("xlnx,eeprom"));

	ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, &dev);
	if (ret)
		return ret;

	ret = dm_i2c_read(dev, CONFIG_ZYNQ_GEM_I2C_MAC_OFFSET, ethaddr, 6);
	if (ret)
		debug("%s: I2C EEPROM MAC address read failed\n", __func__);
	else
		debug("%s: I2C EEPROM MAC %pM\n", __func__, ethaddr);

	return ret;
}
#endif

#define EEPROM_HEADER_MAGIC		0xdaaddeed
#define EEPROM_HDR_MANUFACTURER_LEN	16
#define EEPROM_HDR_NAME_LEN		16
#define EEPROM_HDR_REV_LEN		8
#define EEPROM_HDR_SERIAL_LEN		20
#define EEPROM_HDR_NO_OF_MAC_ADDR	4
#define EEPROM_HDR_ETH_ALEN		ETH_ALEN

struct xilinx_board_description {
	u32 header;
	char manufacturer[EEPROM_HDR_MANUFACTURER_LEN + 1];
	char name[EEPROM_HDR_NAME_LEN + 1];
	char revision[EEPROM_HDR_REV_LEN + 1];
	char serial[EEPROM_HDR_SERIAL_LEN + 1];
	u8 mac_addr[EEPROM_HDR_NO_OF_MAC_ADDR][EEPROM_HDR_ETH_ALEN + 1];
};

static struct xilinx_board_description *board_info;

#define XILINX_I2C_DETECTION_BITS	8

/* Variable which stores pointer to array which stores eeprom content */
struct xilinx_legacy_format {
	char board_sn[18]; /* 0x0 */
	char unused0[14]; /* 0x12 */
	char eth_mac[6]; /* 0x20 */
	char unused1[170]; /* 0x26 */
	char board_name[11]; /* 0xd0 */
	char unused2[5]; /* 0xdc */
	char board_revision[3]; /* 0xe0 */
	char unused3[29]; /* 0xe3 */
};

static void xilinx_eeprom_legacy_cleanup(char *eeprom, int size)
{
	int i;
	char byte;

	for (i = 0; i < size; i++) {
		byte = eeprom[i];

		/* Remove all ffs and spaces */
		if (byte == 0xff || byte == ' ')
			eeprom[i] = 0;

		/* Convert strings to lower case */
		if (byte >= 'A' && byte <= 'Z')
			eeprom[i] = byte + 'a' - 'A';
	}
}

static int xilinx_read_eeprom_legacy(struct udevice *dev, char *name,
				     struct xilinx_board_description *desc)
{
	int ret, size;
	struct xilinx_legacy_format *eeprom_content;
	bool eth_valid = false;

	size = sizeof(*eeprom_content);

	eeprom_content = calloc(1, size);
	if (!eeprom_content)
		return -ENOMEM;

	debug("%s: I2C EEPROM read pass data at %p\n", __func__,
	      eeprom_content);

	ret = dm_i2c_read(dev, 0, (uchar *)eeprom_content, size);
	if (ret) {
		debug("%s: I2C EEPROM read failed\n", __func__);
		free(eeprom_content);
		return ret;
	}

	xilinx_eeprom_legacy_cleanup((char *)eeprom_content, size);

	printf("Xilinx I2C Legacy format at %s:\n", name);
	printf(" Board name:\t%s\n", eeprom_content->board_name);
	printf(" Board rev:\t%s\n", eeprom_content->board_revision);
	printf(" Board SN:\t%s\n", eeprom_content->board_sn);

	eth_valid = is_valid_ethaddr((const u8 *)eeprom_content->eth_mac);
	if (eth_valid)
		printf(" Ethernet mac:\t%pM\n", eeprom_content->eth_mac);

	/* Terminating \0 chars ensure end of string */
	strcpy(desc->name, eeprom_content->board_name);
	strcpy(desc->revision, eeprom_content->board_revision);
	strcpy(desc->serial, eeprom_content->board_sn);
	if (eth_valid)
		memcpy(desc->mac_addr[0], eeprom_content->eth_mac, ETH_ALEN);

	desc->header = EEPROM_HEADER_MAGIC;

	free(eeprom_content);

	return ret;
}

static bool xilinx_detect_legacy(u8 *buffer)
{
	int i;
	char c;

	for (i = 0; i < XILINX_I2C_DETECTION_BITS; i++) {
		c = buffer[i];

		if (c < '0' || c > '9')
			return false;
	}

	return true;
}

static int xilinx_read_eeprom_single(char *name,
				     struct xilinx_board_description *desc)
{
	int ret;
	struct udevice *dev;
	ofnode eeprom;
	u8 buffer[XILINX_I2C_DETECTION_BITS];

	eeprom = ofnode_get_aliases_node(name);
	if (!ofnode_valid(eeprom))
		return -ENODEV;

	ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, &dev);
	if (ret)
		return ret;

	ret = dm_i2c_read(dev, 0, buffer, sizeof(buffer));
	if (ret) {
		debug("%s: I2C EEPROM read failed\n", __func__);
		return ret;
	}

	debug("%s: i2c memory detected: %s\n", __func__, name);

	if (xilinx_detect_legacy(buffer))
		return xilinx_read_eeprom_legacy(dev, name, desc);

	return -ENODEV;
}

__maybe_unused int xilinx_read_eeprom(void)
{
	int id, highest_id;
	char name_buf[8]; /* 8 bytes should be enough for nvmem+number */

	highest_id = dev_read_alias_highest_id("nvmem");
	/* No nvmem aliases present */
	if (highest_id < 0)
		return -EINVAL;

	board_info = calloc(1, sizeof(*board_info));
	if (!board_info)
		return -ENOMEM;

	debug("%s: Highest ID %d, board_info %p\n", __func__,
	      highest_id, board_info);

	for (id = 0; id <= highest_id; id++) {
		snprintf(name_buf, sizeof(name_buf), "nvmem%d", id);

		/* Ignoring return value for supporting multiple chips */
		xilinx_read_eeprom_single(name_buf, board_info);
	}

	if (board_info->header != EEPROM_HEADER_MAGIC)
		free(board_info);

	return 0;
}

#if defined(CONFIG_OF_BOARD) || defined(CONFIG_OF_SEPARATE)
void *board_fdt_blob_setup(void)
{
	void *fdt_blob;

#if !defined(CONFIG_VERSAL_NO_DDR) && !defined(CONFIG_ZYNQMP_NO_DDR)
	fdt_blob = (void *)CONFIG_XILINX_OF_BOARD_DTB_ADDR;

	if (fdt_magic(fdt_blob) == FDT_MAGIC)
		return fdt_blob;

	debug("DTB is not passed via %p\n", fdt_blob);
#endif

#ifdef CONFIG_SPL_BUILD
	/* FDT is at end of BSS unless it is in a different memory region */
	if (IS_ENABLED(CONFIG_SPL_SEPARATE_BSS))
		fdt_blob = (ulong *)&_image_binary_end;
	else
		fdt_blob = (ulong *)&__bss_end;
#else
	/* FDT is at end of image */
	fdt_blob = (ulong *)&_end;
#endif

	if (fdt_magic(fdt_blob) == FDT_MAGIC)
		return fdt_blob;

	debug("DTB is also not passed via %p\n", fdt_blob);

	return NULL;
}
#endif

int board_late_init_xilinx(void)
{
	u32 ret = 0;
	int i;
	phys_size_t bootm_size = gd->ram_size;

	if (CONFIG_IS_ENABLED(ARCH_ZYNQ))
		bootm_size = min(bootm_size, (phys_size_t)(SZ_512M + SZ_256M));

	ret |= env_set_hex("script_offset_f", CONFIG_BOOT_SCRIPT_OFFSET);

	ret |= env_set_addr("bootm_low", (void *)gd->ram_base);
	ret |= env_set_addr("bootm_size", (void *)bootm_size);

	if (board_info) {
		if (board_info->manufacturer)
			ret |= env_set("manufacturer",
				       board_info->manufacturer);
		if (board_info->name)
			ret |= env_set("board_name", board_info->name);
		if (board_info->revision)
			ret |= env_set("board_rev", board_info->revision);
		if (board_info->serial)
			ret |= env_set("board_serial", board_info->serial);

		for (i = 0; i < EEPROM_HDR_NO_OF_MAC_ADDR; i++) {
			if (!board_info->mac_addr[i])
				continue;

			if (!CONFIG_IS_ENABLED(NET))
				continue;

			if (is_valid_ethaddr((const u8 *)board_info->mac_addr[i]))
				ret |= eth_env_set_enetaddr_by_index("eth", i,
						board_info->mac_addr[i]);
		}
	}

	if (ret)
		printf("%s: Saving run time variables FAILED\n", __func__);

	return 0;
}