u-boot-brain/board/toradex/verdin-imx8mm/spl.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2020 Toradex
 */

#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/ddr.h>
#include <asm/arch/imx8mm_pins.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/mach-imx/iomux-v3.h>
#include <cpu_func.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <hang.h>
#include <power/bd71837.h>
#include <power/pmic.h>
#include <spl.h>

DECLARE_GLOBAL_DATA_PTR;

int spl_board_boot_device(enum boot_device boot_dev_spl)
{
	switch (boot_dev_spl) {
	case MMC1_BOOT:
		return BOOT_DEVICE_MMC1;
	case SD2_BOOT:
	case MMC2_BOOT:
		return BOOT_DEVICE_MMC2;
	case SD3_BOOT:
	case MMC3_BOOT:
		return BOOT_DEVICE_MMC1;
	case USB_BOOT:
		return BOOT_DEVICE_BOARD;
	default:
		return BOOT_DEVICE_NONE;
	}
}

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

void spl_board_init(void)
{
	/* Serial download mode */
	if (is_usb_boot()) {
		puts("Back to ROM, SDP\n");
		restore_boot_params();
	}
	puts("Normal Boot\n");
}

#ifdef CONFIG_SPL_LOAD_FIT
int board_fit_config_name_match(const char *name)
{
	/* Just empty function now - can't decide what to choose */
	debug("%s: %s\n", __func__, name);

	return 0;
}
#endif

#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_SAI2_RXFS_UART1_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
	IMX8MM_PAD_SAI2_RXC_UART1_RX | 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),
};

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));

	return 0;
}

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

	ret = pmic_get("pmic@4b", &dev);
	if (ret == -ENODEV) {
		puts("No pmic\n");
		return 0;
	}
	if (ret != 0)
		return ret;

	/* decrease RESET key long push time from the default 10s to 10ms */
	pmic_reg_write(dev, BD718XX_PWRONCONFIG1, 0x0);

	/* unlock the PMIC regs */
	pmic_reg_write(dev, BD718XX_REGLOCK, 0x1);

	/* increase VDD_SOC to typical value 0.85v before first DRAM access */
	pmic_reg_write(dev, BD718XX_BUCK1_VOLT_RUN, 0x0f);

	/* increase VDD_DRAM to 0.975v for 3Ghz DDR */
	pmic_reg_write(dev, BD718XX_1ST_NODVS_BUCK_VOLT, 0x83);

#ifndef CONFIG_IMX8M_LPDDR4
	/* increase NVCC_DRAM_1V2 to 1.2v for DDR4 */
	pmic_reg_write(dev, BD718XX_4TH_NODVS_BUCK_VOLT, 0x28);
#endif

	/* lock the PMIC regs */
	pmic_reg_write(dev, BD718XX_REGLOCK, 0x11);

	return 0;
}

void board_init_f(ulong dummy)
{
	struct udevice *dev;
	int ret;

	arch_cpu_init();

	init_uart_clk(0);

	board_early_init_f();

	timer_init();

	preloader_console_init();

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

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

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

	enable_tzc380();

	power_init_board();

	/* DDR initialization */
	spl_dram_init();

	board_init_r(NULL, 0);
}

int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	puts("resetting ...\n");

	reset_cpu(WDOG1_BASE_ADDR);

	return 0;
}