board: phytec: imx8mm: Add PHYTEC phyCORE-i.MX8MM support

Add support PHYTEC phyCORE-i.MX8MM SOM.

Supported features:
 - 2GB LPDDR4 RAM
 - 1x 1Gbit Ethernet
 - eMMC
 - external SD
 - debug UART3
 - watchdog
 - i2c eeprom

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>

board/phytec/phycore_imx8mm/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_PHYCORE_IMX8MM
+
+config SYS_BOARD
+	default "phycore_imx8mm"
+
+config SYS_VENDOR
+	default "phytec"
+
+config SYS_CONFIG_NAME
+	default "phycore_imx8mm"
+
+endif

board/phytec/phycore_imx8mm/MAINTAINERS

@@ -0,0 +1,9 @@
+phyCORE-i.MX8M Mini
+M:      Teresa Remmet <t.remmet@phytec.de>
+W:      https://www.phytec.eu/product-eu/system-on-modules/phycore-imx-8m-mini-nano/
+S:      Maintained
+F:      arch/arm/dts/phycore-imx8mm.dts
+F:      arch/arm/dts/phycore-imx8mm-u-boot.dtsi
+F:      board/phytec/phycore_imx8mm/
+F:      configs/phycore-imx8mm_defconfig
+F:      include/configs/phycore_imx8mm.h

board/phytec/phycore_imx8mm/Makefile

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Copyright (C) 2019-2020 PHYTEC Messtechnik GmbH
+# Author: Teresa Remmet <t.remmet@phytec.de>
+
+obj-y += phycore-imx8mm.o
+
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+obj-$(CONFIG_IMX8M_LPDDR4) += lpddr4_timing.o
+endif

board/phytec/phycore_imx8mm/phycore-imx8mm.c

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019-2020 PHYTEC Messtechnik GmbH
+ * Author: Teresa Remmet <t.remmet@phytec.de>
+ */
+
+#include <common.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <asm/mach-imx/boot_mode.h>
+#include <env.h>
+#include <miiphy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int setup_fec(void)
+{
+	struct iomuxc_gpr_base_regs *gpr =
+		(struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR;
+
+	/* Use 125M anatop REF_CLK1 for ENET1, not from external */
+	clrsetbits_le32(&gpr->gpr[1], 0x2000, 0);
+
+	return 0;
+}
+
+int board_init(void)
+{
+	setup_fec();
+
+	return 0;
+}
+
+int board_mmc_get_env_dev(int devno)
+{
+	return devno;
+}
+
+int board_late_init(void)
+{
+	switch (get_boot_device()) {
+	case SD2_BOOT:
+		env_set_ulong("mmcdev", 1);
+		break;
+	case MMC3_BOOT:
+		env_set_ulong("mmcdev", 2);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}

board/phytec/phycore_imx8mm/spl.c

@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019-2020 PHYTEC Messtechnik GmbH
+ * Author: Teresa Remmet <t.remmet@phytec.de>
+ */
+
+#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/mach-imx/boot_mode.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+#include <hang.h>
+#include <init.h>
+#include <log.h>
+#include <spl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int spl_board_boot_device(enum boot_device boot_dev_spl)
+{
+	switch (boot_dev_spl) {
+	case SD2_BOOT:
+	case MMC2_BOOT:
+		return BOOT_DEVICE_MMC1;
+	case SD3_BOOT:
+	case MMC3_BOOT:
+		return BOOT_DEVICE_MMC2;
+	case QSPI_BOOT:
+		return BOOT_DEVICE_NOR;
+	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_DSE6 | PAD_CTL_FSEL1)
+#define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_ODE)
+
+static iomux_v3_cfg_t const uart_pads[] = {
+	IMX8MM_PAD_UART3_RXD_UART3_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	IMX8MM_PAD_UART3_TXD_UART3_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),
+};
+
+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;
+}
+
+void board_init_f(ulong dummy)
+{
+	struct udevice *dev;
+	int ret;
+
+	arch_cpu_init();
+
+	init_uart_clk(2);
+
+	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();
+
+	/* DDR initialization */
+	spl_dram_init();
+
+	board_init_r(NULL, 0);
+}