u-boot/board/variscite/imx8mn_var_som/spl.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2021 Collabora Ltd.
 *
 */

#include <hang.h>
#include <init.h>
#include <spl.h>
#include <asm/arch/clock.h>
#include <asm/arch/ddr.h>
#include <asm/arch/imx8mn_pins.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/mach-imx/gpio.h>
#include <dm/device.h>
#include <dm/uclass.h>

int spl_board_boot_device(enum boot_device boot_dev_spl)
{
	return BOOT_DEVICE_BOOTROM;
}

void spl_dram_init(void)
{
	ddr_init(&dram_timing);
}

void spl_board_init(void)
{
	struct udevice *dev;
	int ret;

	debug("Normal Boot\n");

	ret = uclass_get_device_by_name(UCLASS_CLK,
					"clock-controller@30380000",
					&dev);
	if (ret < 0)
		puts("Failed to find clock node. Check device tree\n");
}

#define UART_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_FSEL1)
#define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_ODE | PAD_CTL_PUE | PAD_CTL_PE)

static const iomux_v3_cfg_t uart_pads[] = {
	IMX8MN_PAD_UART4_RXD__UART4_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
	IMX8MN_PAD_UART4_TXD__UART4_DCE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
};

static const iomux_v3_cfg_t wdog_pads[] = {
	IMX8MN_PAD_GPIO1_IO02__WDOG1_WDOG_B | MUX_PAD_CTRL(WDOG_PAD_CTRL),
};

int board_early_init_f(void)
{
	struct wdog_regs *wdog = (struct wdog_regs *)WDOG1_BASE_ADDR;

	imx_iomux_v3_setup_multiple_pads(wdog_pads, ARRAY_SIZE(wdog_pads));
	set_wdog_reset(wdog);

	imx_iomux_v3_setup_multiple_pads(uart_pads, ARRAY_SIZE(uart_pads));
	init_uart_clk(3);

	return 0;
}

void board_init_f(ulong dummy)
{
	int ret;

	/* Clear the BSS. */
	memset(__bss_start, 0, __bss_end - __bss_start);

	arch_cpu_init();

	board_early_init_f();

	timer_init();

	preloader_console_init();

	ret = spl_init();
	if (ret) {
		debug("spl_init() failed: %d\n", ret);
		hang();
	}

	/* DDR initialization */
	spl_dram_init();

	board_init_r(NULL, 0);
}