u-boot/board/menlo/mx8menlo/mx8menlo.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2021-2022 Marek Vasut <marex@denx.de>
 */

#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx8mm_pins.h>
#include <asm/arch/sys_proto.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/mach-imx/iomux-v3.h>
#include <spl.h>

#define UART_PAD_CTRL	(PAD_CTL_PUE | PAD_CTL_PE | PAD_CTL_DSE4)
#define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_ODE | PAD_CTL_PUE | PAD_CTL_PE)

/* Verdin UART_3, Console/Debug UART */
static iomux_v3_cfg_t const uart_pads[] = {
	IMX8MM_PAD_SAI3_TXFS_UART2_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
	IMX8MM_PAD_SAI3_TXC_UART2_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
};

static iomux_v3_cfg_t const wdog_pads[] = {
	IMX8MM_PAD_GPIO1_IO02_WDOG1_WDOG_B  | MUX_PAD_CTRL(WDOG_PAD_CTRL),
};

#define SNVS_BASE_ADDR		0x30370000
#define SNVS_LPSR		0x4c
#define SNVS_LPLVDR		0x64
#define SNVS_LPPGDR_INIT	0x41736166

static void setup_snvs(void)
{
	/* Enable SNVS clock */
	clock_enable(CCGR_SNVS, 1);
	/* Initialize glitch detect */
	writel(SNVS_LPPGDR_INIT, SNVS_BASE_ADDR + SNVS_LPLVDR);
	/* Clear interrupt status */
	writel(0xffffffff, SNVS_BASE_ADDR + SNVS_LPSR);
}

void board_early_init(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(1);

	setup_snvs();
}