U-Boot

// SPDX-License-Identifier: GPL-2.0+
/*
 * XEA iMX28 board
 *
 * Copyright (C) 2019 DENX Software Engineering
 * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
 *
 * Copyright (C) 2018 DENX Software Engineering
 * Måns Rullgård, DENX Software Engineering, mans@mansr.com
 *
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 * on behalf of DENX Software Engineering GmbH
 *
 */

#include <env.h>
#include <fdt_support.h>
#include <init.h>
#include <log.h>
#include <net.h>
#include <asm/global_data.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/iomux-mx28.h>
#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <miiphy.h>
#include <netdev.h>
#include <errno.h>
#include <usb.h>
#include <serial.h>
#include <u-boot/crc.h>
#include "boot_img_scr.h"

#include <spi.h>
#include <spi_flash.h>

#ifdef CONFIG_XPL_BUILD
#include <spl.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

/*
 * Functions
 */

static void init_clocks(void)
{
	/* IO0 clock at 480MHz */
	mxs_set_ioclk(MXC_IOCLK0, 480000);
	/* IO1 clock at 480MHz */
	mxs_set_ioclk(MXC_IOCLK1, 480000);

	/* SSP0 clock at 96MHz */
	mxs_set_sspclk(MXC_SSPCLK0, 96000, 0);
	/* SSP2 clock at 160MHz */
	mxs_set_sspclk(MXC_SSPCLK2, 160000, 0);
	/* SSP3 clock at 96MHz */
	mxs_set_sspclk(MXC_SSPCLK3, 96000, 0);
}

#if defined(CONFIG_XPL_BUILD) && defined(CONFIG_SPL_FRAMEWORK)
void board_init_f(ulong arg)
{
	init_clocks();
	spl_early_init();
	preloader_console_init();
}

static struct boot_img_src img_src[2];
static int spi_load_boot_info(void)
{
	struct spi_flash *flash;
	int err;

	flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
				CONFIG_SF_DEFAULT_CS,
				CONFIG_SF_DEFAULT_SPEED,
				CONFIG_SF_DEFAULT_MODE);
	if (!flash) {
		printf("%s: SPI probe err\n", __func__);
		return -ENODEV;
	}

	/*
	 * Load both boot info structs from SPI flash
	 */
	err = spi_flash_read(flash, SPI_FLASH_BOOT_SRC_OFFS,
			     sizeof(img_src[0]),
			     (void *)&img_src[0]);
	if (err) {
		debug("%s: First boot info NOR sector read error %d\n",
		      __func__, err);
		return err;
	}

	err = spi_flash_read(flash,
			     SPI_FLASH_BOOT_SRC_OFFS + SPI_FLASH_SECTOR_SIZE,
			     sizeof(img_src[0]),
			     (void *)&img_src[1]);
	if (err) {
		debug("%s: First boot info NOR sector read error %d\n",
		      __func__, err);
		return err;
	}

	debug("%s: BI0 0x%x 0x%x 0x%x\n", __func__,
	      img_src[0].magic, img_src[0].flags, img_src[0].crc8);

	debug("%s: BI1 0x%x 0x%x 0x%x\n", __func__,
	      img_src[1].magic, img_src[1].flags, img_src[1].crc8);

	return 0;
}

static int boot_tiva0, boot_tiva1;

/* Check if TIVAs request booting via U-Boot proper */
void spl_board_init(void)
{
	struct gpio_desc btiva0, btiva1, en_3_3v;
	int ret;

	/*
	 * Setup GPIO0_0 (TIVA power enable pin) to be output high
	 * to allow TIVA startup.
	 */
	ret = dm_gpio_lookup_name("GPIO0_0", &en_3_3v);
	if (ret)
		printf("Cannot get GPIO0_0\n");

	ret = dm_gpio_request(&en_3_3v, "pwr_3_3v");
	if (ret)
		printf("Cannot request GPIO0_0\n");

	/* Set GPIO0_0 to HIGH */
	dm_gpio_set_dir_flags(&en_3_3v, GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);

	ret = dm_gpio_lookup_name("GPIO0_23", &btiva0);
	if (ret)
		printf("Cannot get GPIO0_23\n");

	ret = dm_gpio_lookup_name("GPIO0_25", &btiva1);
	if (ret)
		printf("Cannot get GPIO0_25\n");

	ret = dm_gpio_request(&btiva0, "boot-tiva0");
	if (ret)
		printf("Cannot request GPIO0_23\n");

	ret = dm_gpio_request(&btiva1, "boot-tiva1");
	if (ret)
		printf("Cannot request GPIO0_25\n");

	dm_gpio_set_dir_flags(&btiva0, GPIOD_IS_IN);
	dm_gpio_set_dir_flags(&btiva1, GPIOD_IS_IN);

	udelay(1000);

	boot_tiva0 = dm_gpio_get_value(&btiva0);
	boot_tiva1 = dm_gpio_get_value(&btiva1);
}

int spl_mmc_emmc_boot_partition(struct mmc *mmc)
{
	int i, src_idx = -1, ret;

	ret = spi_load_boot_info();
	if (ret) {
		printf("%s: Cannot read XEA boot info! [%d]\n", __func__, ret);
		/* To avoid bricking board - by default boot from boot0 eMMC */
		return 1;
	}

	for (i = 0; i < 2; i++) {
		if (img_src[i].magic == 'B' &&
		    img_src[i].crc8 == crc8(0, &img_src[i].magic, 2)) {
			src_idx = i;
			break;
		}
	}

	debug("%s: src idx: %d\n", __func__, src_idx);

	if (src_idx < 0)
		/*
		 * Always use eMMC (mmcblkX) boot0 if no
		 * valid image source description found
		 */
		return 1;

	if (img_src[src_idx].flags & BOOT_SRC_PART1)
		return 2;

	return 1;
}

void board_boot_order(u32 *spl_boot_list)
{
	spl_boot_list[0] = BOOT_DEVICE_MMC1;
	spl_boot_list[1] = BOOT_DEVICE_SPI;
	spl_boot_list[2] = BOOT_DEVICE_UART;
}

int spl_start_uboot(void)
{
	/* break into full u-boot on 'c' */
	if (serial_tstc() && serial_getc() == 'c')
		return 1;

	debug("%s: btiva0: %d btiva1: %d\n", __func__, boot_tiva0, boot_tiva1);
	return !boot_tiva0 || !boot_tiva1;
}
#else
/*
 * Reading the HW ID number for XEA SoM module
 *
 * GPIOs from Port 1 (GPIO1_15, GPIO1_16, GPIO1_17 and GPIO1_18)
 * are used to store HW revision information.
 * Reading of GPIOs values is performed before the Device Model is
 * bring up as the proper DTB needs to be chosen first.
 *
 * Moreover, this approach is required as "single binary" configuration
 * of U-Boot (imx28_xea_sb_defconfig) is NOT using SPL framework, so
 * only minimal subset of functionality is provided when ID is read.
 *
 * Hence, the direct registers' access.
 */
#define XEA_SOM_HW_ID_GPIO_PORT (MXS_PINCTRL_BASE + (0x0900 + ((1) * 0x10)))
#define XEA_SOM_REV_MASK GENMASK(18, 15)
#define XEA_SOM_REV_SHIFT 15

static u8 get_som_rev(void)
{
	struct mxs_register_32 *reg =
		(struct mxs_register_32 *)XEA_SOM_HW_ID_GPIO_PORT;

	u32 tmp = ~readl(&reg->reg);
	u8 id = (tmp & XEA_SOM_REV_MASK) >> XEA_SOM_REV_SHIFT;

	return id;
}

int board_early_init_f(void)
{
	init_clocks();

	return 0;
}

int board_init(void)
{
	struct gpio_desc phy_rst;
	int ret;

	/* Address of boot parameters */
	gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x100;

	cpu_eth_init(NULL);

	/* PHY INT#/PWDN# */
	ret = dm_gpio_lookup_name("GPIO4_13", &phy_rst);
	if (ret) {
		printf("Cannot get GPIO4_13\n");
		return ret;
	}

	ret = dm_gpio_request(&phy_rst, "phy-rst");
	if (ret) {
		printf("Cannot request GPIO4_13\n");
		return ret;
	}

	dm_gpio_set_dir_flags(&phy_rst, GPIOD_IS_IN);
	udelay(1000);

	return 0;
}

#if defined(CONFIG_BOARD_LATE_INIT)
int board_late_init(void)
{
	int ret = env_set_ulong("board_som_rev", get_som_rev());

	if (ret)
		printf("Cannot set XEA's SoM revision env variable!\n");

	return 0;
}
#endif

#if defined(CONFIG_DISPLAY_BOARDINFO)
int checkboard(void)
{
	printf("Board: LWE XEA SoM HW rev %d\n", get_som_rev());

	return 0;
}
#endif

int dram_init(void)
{
	return mxs_dram_init();
}

#ifdef CONFIG_OF_BOARD_SETUP
static int fdt_fixup_l2switch(void *blob)
{
	u8 ethaddr[6];
	int ret;

	if (eth_env_get_enetaddr("ethaddr", ethaddr)) {
		ret = fdt_find_and_setprop(blob,
					   "/ahb@80080000/switch@800f0000",
					   "local-mac-address", ethaddr, 6, 1);
		if (ret < 0)
			printf("%s: can't find usbether@1 node: %d\n",
			       __func__, ret);
	}

	return 0;
}

int ft_board_setup(void *blob, struct bd_info *bd)
{
	/*
	 * i.MX28 L2 switch needs manual update (fixup) of eth MAC address
	 * (in 'local-mac-address' property) as it uses "switch@800f0000"
	 * node, not set by default FIT image handling code in
	 * "ethernet@800f0000"
	 */
	fdt_fixup_l2switch(blob);

	return 0;
}
#endif
/*
 * NOTE:
 *
 * IMX28 clock "stub" DM driver!
 *
 * Only used for SPL stage, which is NOT using DM; serial and
 * eMMC configuration.
 */
static const struct udevice_id imx28_clk_ids[] = {
	{ .compatible = "fsl,imx28-clkctrl", },
	{ }
};

U_BOOT_DRIVER(fsl_imx28_clkctrl) = {
	.name           = "fsl_imx28_clkctrl",
	.id             = UCLASS_CLK,
	.of_match       = imx28_clk_ids,
};
#endif	/* CONFIG_XPL_BUILD */