path: root/board/ti/am64x/evm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Board specific initialization for AM642 EVM
 *
 * Copyright (C) 2020-2022 Texas Instruments Incorporated - https://www.ti.com/
 *	Keerthy <j-keerthy@ti.com>
 *
 */

#include <common.h>
#include <asm/io.h>
#include <dm/uclass.h>
#include <k3-ddrss.h>
#include <net.h>
#include <spl.h>
#include <fdt_support.h>
#include <asm/gpio.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#include <env.h>

#include "../common/board_detect.h"
#include "../common/k3-ddr-init.h"

#define board_is_am64x_gpevm() (board_ti_k3_is("AM64-GPEVM") || \
				board_ti_k3_is("AM64-EVM") || \
				board_ti_k3_is("AM64-HSEVM"))

#define board_is_am64x_skevm() (board_ti_k3_is("AM64-SKEVM") || \
				board_ti_k3_is("AM64B-SKEVM"))

#define AM64X_MAX_DAUGHTER_CARDS	8

/* Daughter card presence detection signals */
enum {
	AM64X_EVM_HSE_BRD_DET,
	AM64X_EVM_BRD_DET_COUNT,
};

#define AM642_NAND_DTBO		"k3-am642-evm-nand.dtbo"

static struct gpio_desc board_det_gpios[AM64X_EVM_BRD_DET_COUNT];

/* Max number of MAC addresses that are parsed/processed per daughter card */
#define DAUGHTER_CARD_NO_OF_MAC_ADDR	8

DECLARE_GLOBAL_DATA_PTR;

int board_init(void)
{
	return 0;
}

static bool is_nand;
#if defined(CONFIG_SPL_LOAD_FIT)
int board_fit_config_name_match(const char *name)
{
	bool eeprom_read = board_ti_was_eeprom_read();

	if (!eeprom_read || board_is_am64x_gpevm()) {
		if (is_nand) {
			if (!strcmp(name, "k3-am642-r5-evm") || !strcmp(name, "k3-am642-evm-nand"))
				return 0;
		} else {
			if (!strcmp(name, "k3-am642-r5-evm") || !strcmp(name, "k3-am642-evm"))
				return 0;
		}
	} else if (board_is_am64x_skevm()) {
		if (!strcmp(name, "k3-am642-r5-sk") || !strcmp(name, "k3-am642-sk"))
			return 0;
	}

	return -1;
}
#endif

#if defined(CONFIG_SPL_BUILD)
#if CONFIG_IS_ENABLED(USB_STORAGE)
static int fixup_usb_boot(const void *fdt_blob)
{
	int ret = 0;

	switch (spl_boot_device()) {
	case BOOT_DEVICE_USB:
		/*
		 * If the boot mode is host, fixup the dr_mode to host
		 * before cdns3 bind takes place
		 */
		ret = fdt_find_and_setprop((void *)fdt_blob,
					   "/bus@f4000/cdns-usb@f900000/usb@f400000",
					   "dr_mode", "host", 5, 0);
		if (ret)
			printf("%s: fdt_find_and_setprop() failed:%d\n",
			       __func__, ret);
		fallthrough;
	default:
		break;
	}

	return ret;
}
#endif

void spl_perform_fixups(struct spl_image_info *spl_image)
{
	if (IS_ENABLED(CONFIG_K3_INLINE_ECC))
		fixup_ddr_driver_for_ecc(spl_image);

#if CONFIG_IS_ENABLED(USB_STORAGE)
	fixup_usb_boot(spl_image->fdt_addr);
#endif
}
#endif

#ifdef CONFIG_TI_I2C_BOARD_DETECT
int do_board_detect(void)
{
	int ret;

	ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
					 CONFIG_EEPROM_CHIP_ADDRESS);
	if (ret) {
		printf("EEPROM not available at 0x%02x, trying to read at 0x%02x\n",
			CONFIG_EEPROM_CHIP_ADDRESS, CONFIG_EEPROM_CHIP_ADDRESS + 1);
		ret = ti_i2c_eeprom_am6_get_base(CONFIG_EEPROM_BUS_ADDRESS,
						 CONFIG_EEPROM_CHIP_ADDRESS + 1);
		if (ret)
			pr_err("Reading on-board EEPROM at 0x%02x failed %d\n",
			       CONFIG_EEPROM_CHIP_ADDRESS + 1, ret);
	}

	return ret;
}

int checkboard(void)
{
	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

	if (!do_board_detect())
		printf("Board: %s rev %s\n", ep->name, ep->version);

	return 0;
}

#ifdef CONFIG_BOARD_LATE_INIT
static void setup_board_eeprom_env(void)
{
	char *name = "am64x_gpevm";

	if (do_board_detect())
		goto invalid_eeprom;

	if (board_is_am64x_gpevm())
		name = "am64x_gpevm";
	else if (board_is_am64x_skevm())
		name = "am64x_skevm";
	else
		printf("Unidentified board claims %s in eeprom header\n",
		       board_ti_get_name());

invalid_eeprom:
	set_board_info_env_am6(name);
}

static void setup_serial(void)
{
	struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;
	unsigned long board_serial;
	char *endp;
	char serial_string[17] = { 0 };

	if (env_get("serial#"))
		return;

	board_serial = hextoul(ep->serial, &endp);
	if (*endp != '\0') {
		pr_err("Error: Can't set serial# to %s\n", ep->serial);
		return;
	}

	snprintf(serial_string, sizeof(serial_string), "%016lx", board_serial);
	env_set("serial#", serial_string);
}
#endif
#endif

static const char *k3_dtbo_list[AM64X_MAX_DAUGHTER_CARDS] = {NULL};

static int init_daughtercard_det_gpio(char *gpio_name, struct gpio_desc *desc)
{
	int ret;

	memset(desc, 0, sizeof(*desc));

	ret = dm_gpio_lookup_name(gpio_name, desc);
	if (ret < 0) {
		pr_err("Failed to lookup gpio %s: %d\n", gpio_name, ret);
		return ret;
	}

	/* Request GPIO, simply re-using the name as label */
	ret = dm_gpio_request(desc, gpio_name);
	if (ret < 0) {
		pr_err("Failed to request gpio %s: %d\n", gpio_name, ret);
		return ret;
	}

	return dm_gpio_set_dir_flags(desc, GPIOD_IS_IN);
}

static int probe_daughtercards(void)
{
	struct ti_am6_eeprom ep;
	char mac_addr[DAUGHTER_CARD_NO_OF_MAC_ADDR][TI_EEPROM_HDR_ETH_ALEN];
	u8 mac_addr_cnt;
	char name_overlays[1024] = { 0 };
	int i, nb_dtbos = 0;
	int ret;

	/*
	 * Daughter card presence detection signal name to GPIO (via I2C I/O
	 * expander @ address 0x38) name and EEPROM I2C address mapping.
	 */
	const struct {
		char *gpio_name;
		u8 i2c_addr;
	} slot_map[AM64X_EVM_BRD_DET_COUNT] = {
		{ "gpio@38_0", 0x52, },	/* AM64X_EVM_HSE_BRD_DET */
	};

	/* Declaration of daughtercards to probe */
	const struct {
		u8 slot_index;		/* Slot the card is installed */
		char *card_name;	/* EEPROM-programmed card name */
		char *dtbo_name;	/* Device tree overlay to apply */
		u8 eth_offset;		/* ethXaddr MAC address index offset */
	} cards[] = {
		{
			AM64X_EVM_HSE_BRD_DET,
			"TMDS64DC02EVM",
			AM642_NAND_DTBO,
			0,
		},
	};

	/*
	 * Initialize GPIO used for daughtercard slot presence detection and
	 * keep the resulting handles in local array for easier access.
	 */
	for (i = 0; i < AM64X_EVM_BRD_DET_COUNT; i++) {
		ret = init_daughtercard_det_gpio(slot_map[i].gpio_name,
						 &board_det_gpios[i]);
		if (ret < 0)
			return ret;
	}

	memset(k3_dtbo_list, 0, sizeof(k3_dtbo_list));
	for (i = 0; i < ARRAY_SIZE(cards); i++) {
		/* Obtain card-specific slot index and associated I2C address */
		u8 slot_index = cards[i].slot_index;
		u8 i2c_addr = slot_map[slot_index].i2c_addr;
		const char *dtboname;

		/*
		 * The presence detection signal is active-low, hence skip
		 * over this card slot if anything other than 0 is returned.
		 */
		ret = dm_gpio_get_value(&board_det_gpios[slot_index]);
		if (ret < 0)
			return ret;
		else if (ret)
			continue;

		/* Get and parse the daughter card EEPROM record */
		ret = ti_i2c_eeprom_am6_get(CONFIG_EEPROM_BUS_ADDRESS, i2c_addr,
					    &ep,
					    (char **)mac_addr,
					    DAUGHTER_CARD_NO_OF_MAC_ADDR,
					    &mac_addr_cnt);
		if (ret) {
			pr_err("Reading daughtercard EEPROM at 0x%02x failed %d\n",
			       i2c_addr, ret);
			/*
			 * Even this is pretty serious let's just skip over
			 * this particular daughtercard, rather than ending
			 * the probing process altogether.
			 */
			continue;
		}

		/* Only process the parsed data if we found a match */
		if (strncmp(ep.name, cards[i].card_name, sizeof(ep.name)))
			continue;

		printf("Detected: %s rev %s\n", ep.name, ep.version);

#ifndef CONFIG_SPL_BUILD
		int j;
		/*
		 * Populate any MAC addresses from daughtercard into the U-Boot
		 * environment, starting with a card-specific offset so we can
		 * have multiple cards contribute to the MAC pool in a well-
		 * defined manner.
		 */
		for (j = 0; j < mac_addr_cnt; j++) {
			if (!is_valid_ethaddr((u8 *)mac_addr[j]))
				continue;

			eth_env_set_enetaddr_by_index("eth",
						      cards[i].eth_offset + j,
						      (uchar *)mac_addr[j]);
		}
#endif

		/* Skip if no overlays are to be added */
		if (!strlen(cards[i].dtbo_name))
			continue;

		dtboname = cards[i].dtbo_name;
		k3_dtbo_list[nb_dtbos++] = dtboname;

		if (!strcmp(dtboname, AM642_NAND_DTBO))
			is_nand = true;

		/*
		 * Make sure we are not running out of buffer space by checking
		 * if we can fit the new overlay, a trailing space to be used
		 * as a separator, plus the terminating zero.
		 */
		if (strlen(name_overlays) + strlen(dtboname) + 2 >
		    sizeof(name_overlays))
			return -ENOMEM;

		/* Append to our list of overlays */
		strcat(name_overlays, dtboname);
		strcat(name_overlays, " ");
	}

#ifndef CONFIG_SPL_BUILD
	/* Apply device tree overlay(s) to the U-Boot environment, if any */
	if (strlen(name_overlays))
		return env_set("name_overlays", name_overlays);
#endif

	return 0;
}

#ifdef CONFIG_BOARD_LATE_INIT
int board_late_init(void)
{
	if (IS_ENABLED(CONFIG_TI_I2C_BOARD_DETECT)) {
		struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

		setup_board_eeprom_env();
		setup_serial();
		/*
		 * The first MAC address for ethernet a.k.a. ethernet0 comes from
		 * efuse populated via the am654 gigabit eth switch subsystem driver.
		 * All the other ones are populated via EEPROM, hence continue with
		 * an index of 1.
		 */
		board_ti_am6_set_ethaddr(1, ep->mac_addr_cnt);

		/* Check for and probe any plugged-in daughtercards */
		if (board_is_am64x_gpevm())
			probe_daughtercards();
	}

	return 0;
}
#endif

#define CTRLMMR_USB0_PHY_CTRL	0x43004008
#define CORE_VOLTAGE		0x80000000

#ifdef CONFIG_SPL_BOARD_INIT
void spl_board_init(void)
{
	u32 val;
	/* Set USB PHY core voltage to 0.85V */
	val = readl(CTRLMMR_USB0_PHY_CTRL);
	val &= ~(CORE_VOLTAGE);
	writel(val, CTRLMMR_USB0_PHY_CTRL);

	/* Init DRAM size for R5/A53 SPL */
	dram_init_banksize();

	/* Check for and probe any plugged-in daughtercards */
	if (board_is_am64x_gpevm())
		probe_daughtercards();
}
#endif