ARM: imx: pico-imx8mq: Add support for Technexion Pico-iMX8MQ

Add initial support for Technexion Pico-iMX8MQ SoM on PicoPI carrier
board. Currently working is ethernet, serial, eMMC. DT is imported
from Linux 5.4.28 ("462afcd6e7ea") .

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: "NXP i.MX U-Boot Team" <uboot-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

board/technexion/pico-imx8mq/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_PICO_IMX8MQ
+
+config SYS_BOARD
+	default "pico-imx8mq"
+
+config SYS_VENDOR
+	default "technexion"
+
+config SYS_CONFIG_NAME
+	default "pico-imx8mq"
+
+endif

board/technexion/pico-imx8mq/MAINTAINERS

@@ -0,0 +1,6 @@
+PICOPI IMX8MQ BOARD
+M:	Marek Vasut <marek.vasut@gmail.com>
+S:	Maintained
+F:	board/technexion/pico-imx8mq/
+F:	include/configs/pico-imx8mq.h
+F:	configs/pico-imx8mq_defconfig

board/technexion/pico-imx8mq/Makefile

@@ -0,0 +1,12 @@
+#
+# Copyright 2017 NXP
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+obj-y += pico-imx8mq.o
+
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+obj-$(CONFIG_IMX8M_LPDDR4) += lpddr4_timing_1gb.o lpddr4_timing_2gb.o lpddr4_timing_3gb.o lpddr4_timing_4gb.o
+endif

board/technexion/pico-imx8mq/README

@@ -0,0 +1,52 @@
+U-Boot for the Technexion Pico i.MX8MQ
+
+Quick Start
+===========
+- Build the TFA binary
+- Get DDR and HDMI firmware
+- Build U-Boot
+- Boot
+
+Get and Build the TFA blob
+==========================
+Note: srctree is U-Boot source directory
+Get ATF from: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
+branch: master
+$ CROSS_COMPILE=aarch64-linux-gnu- make PLAT=imx8mq bl31
+$ cp build/imx8mq/release/bl31.bin $(builddir)
+
+Get the DDR and HDMI firmware
+=============================
+$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-7.9.bin
+$ chmod +x firmware-imx-7.9.bin
+$ ./firmware-imx-7.9.bin
+# Or use this to avoid running random scripts from the internet,
+# but note that you must agree to the license the script displays:
+# $ dd if=firmware-imx-7.9.bin of=firmware-imx-7.9.tar.bz2 bs=38868 skip=1
+# $ tar -xf firmware-imx-7.9.tar.bz2
+$ cp firmware-imx-7.9/firmware/hdmi/cadence/signed_hdmi_imx8m.bin $(builddir)
+$ cp firmware-imx-7.9/firmware/ddr/synopsys/lpddr4*.bin $(builddir)
+
+Build U-Boot
+============
+$ export CROSS_COMPILE=aarch64-poky-linux-
+$ make pico-imx8mq_defconfig
+$ make flash.bin
+
+Burn the flash.bin to MicroSD card offset 33KB
+$ dd if=flash.bin of=/dev/mmcblkX bs=1024 seek=33
+Or into eMMC from a running system
+$ dhcp flash.bin && mmc write $loadaddr 0x42 0x800
+
+Boot
+====
+"o" denotes a pin
+"[]" denotes two pins bridged by a jumper
+
+eMMC boot:
+J1 o[] []o J2
+   []o o[]
+
+USB upload via USB-C connector:
+J1 ooo ooo J2
+   o[] []o

board/technexion/pico-imx8mq/lpddr4_timing.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#ifndef __LPDDR4_TIMING_H__
+#define __LPDDR4_TIMING_H__
+
+extern struct dram_timing_info dram_timing_1gb;
+extern struct dram_timing_info dram_timing_2gb;
+extern struct dram_timing_info dram_timing_3gb;
+extern struct dram_timing_info dram_timing_4gb;
+
+#endif /* __LPDDR4_TIMING_H__ */

board/technexion/pico-imx8mq/pico-imx8mq.c

@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ */
+
+#include <common.h>
+#include <env.h>
+#include <init.h>
+#include <malloc.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <miiphy.h>
+#include <netdev.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm-generic/gpio.h>
+#include <fsl_esdhc_imx.h>
+#include <mmc.h>
+#include <asm/arch/imx8mq_pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/mach-imx/gpio.h>
+#include <asm/mach-imx/mxc_i2c.h>
+#include <asm/arch/clock.h>
+#include <spl.h>
+#include <power/pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define UART_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_FSEL1)
+
+#define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE)
+
+static iomux_v3_cfg_t const wdog_pads[] = {
+	IMX8MQ_PAD_GPIO1_IO02__WDOG1_WDOG_B | MUX_PAD_CTRL(WDOG_PAD_CTRL),
+};
+
+static iomux_v3_cfg_t const uart_pads[] = {
+	IMX8MQ_PAD_UART1_RXD__UART1_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	IMX8MQ_PAD_UART1_TXD__UART1_TX | MUX_PAD_CTRL(UART_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 dram_init(void)
+{
+	int ddr_size = readl(M4_BOOTROM_BASE_ADDR);
+
+	if (ddr_size == 0x4)
+		gd->ram_size = 0x100000000;
+	else if (ddr_size == 0x3)
+		gd->ram_size = 0xc0000000;
+	else if (ddr_size == 0x2)
+		gd->ram_size = 0x80000000;
+	else if (ddr_size == 0x1)
+		gd->ram_size = 0x40000000;
+	else
+		printf("Unknown DDR type!!!\n");
+
+	/* rom_pointer[1] contains the size of TEE occupies */
+	if (rom_pointer[1])
+		gd->ram_size -= rom_pointer[1];
+
+	return 0;
+}
+
+#ifdef CONFIG_FEC_MXC
+#define FEC_RST_PAD IMX_GPIO_NR(1, 9)
+#define FEC_PWR_PAD IMX_GPIO_NR(1, 0)
+static iomux_v3_cfg_t const fec1_pads[] = {
+	/* Reset */
+	IMX8MQ_PAD_GPIO1_IO09__GPIO1_IO9 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	/* Power */
+	IMX8MQ_PAD_GPIO1_IO00__GPIO1_IO0 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+static void setup_iomux_fec(void)
+{
+	imx_iomux_v3_setup_multiple_pads(fec1_pads, ARRAY_SIZE(fec1_pads));
+
+	gpio_request(IMX_GPIO_NR(1, 0), "fec1_pwr");
+	gpio_direction_output(IMX_GPIO_NR(1, 0), 1);
+	udelay(500);
+
+	gpio_request(IMX_GPIO_NR(1, 9), "fec1_rst");
+	gpio_direction_output(IMX_GPIO_NR(1, 9), 0);
+	udelay(500);
+	gpio_direction_output(IMX_GPIO_NR(1, 9), 1);
+}
+
+static int setup_fec(void)
+{
+	struct iomuxc_gpr_base_regs *gpr =
+		(struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR;
+
+	setup_iomux_fec();
+
+	/* Use 125M anatop REF_CLK1 for ENET1, not from external */
+	clrsetbits_le32(&gpr->gpr[1], BIT(13) | BIT(17), 0);
+	return set_clk_enet(ENET_125MHZ);
+}
+
+int board_phy_config(struct phy_device *phydev)
+{
+	/* enable rgmii rxc skew and phy mode select to RGMII copper */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x1f);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x8);
+
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x05);
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x100);
+
+	if (phydev->drv->config)
+		phydev->drv->config(phydev);
+	return 0;
+}
+#endif
+
+int board_init(void)
+{
+#ifdef CONFIG_FEC_MXC
+	setup_fec();
+#endif
+
+	return 0;
+}
+
+int board_mmc_get_env_dev(int devno)
+{
+	return devno;
+}
+
+int board_late_init(void)
+{
+#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+	env_set("board_rev", "iMX8MQ");
+#endif
+	return 0;
+}

board/technexion/pico-imx8mq/spl.c

@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ */
+
+#include <common.h>
+#include <hang.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/ddr.h>
+#include <asm/arch/imx8mq_pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/io.h>
+#include <asm/mach-imx/gpio.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm/mach-imx/mxc_i2c.h>
+#include <errno.h>
+#include <fsl_esdhc_imx.h>
+#include <mmc.h>
+#include <spl.h>
+
+#include "lpddr4_timing.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define DDR_DET_1		IMX_GPIO_NR(3, 11)
+#define DDR_DET_2		IMX_GPIO_NR(3, 12)
+#define DDR_DET_3		IMX_GPIO_NR(3, 13)
+
+static iomux_v3_cfg_t const verdet_pads[] = {
+	IMX8MQ_PAD_NAND_DATA01__GPIO3_IO7 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA02__GPIO3_IO8 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA03__GPIO3_IO9 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA04__GPIO3_IO10 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA05__GPIO3_IO11 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA06__GPIO3_IO12 | MUX_PAD_CTRL(NO_PAD_CTRL),
+	IMX8MQ_PAD_NAND_DATA07__GPIO3_IO13 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+/*
+ * DDR_DET_1    DDR_DET_2   DDR_DET_3
+ *    0            0            1       4G LPDDR4
+ *    1            1            1       3G LPDDR4
+ *    1            1            0       2G LPDDR4
+ *    1            0            1       1G LPDDR4
+ */
+static void spl_dram_init(void)
+{
+	struct dram_timing_info *dram_timing;
+	u8 ddr = 0, size;
+
+	imx_iomux_v3_setup_multiple_pads(verdet_pads, ARRAY_SIZE(verdet_pads));
+
+	gpio_request(DDR_DET_1, "ddr_det_1");
+	gpio_direction_input(DDR_DET_1);
+	gpio_request(DDR_DET_2, "ddr_det_2");
+	gpio_direction_input(DDR_DET_2);
+	gpio_request(DDR_DET_3, "ddr_det_3");
+	gpio_direction_input(DDR_DET_3);
+
+	ddr |= !!gpio_get_value(DDR_DET_3) << 0;
+	ddr |= !!gpio_get_value(DDR_DET_2) << 1;
+	ddr |= !!gpio_get_value(DDR_DET_1) << 2;
+
+	switch (ddr) {
+	case 0x1:
+		size = 4;
+		dram_timing = &dram_timing_4gb;
+		break;
+	case 0x7:
+		size = 3;
+		dram_timing = &dram_timing_3gb;
+		break;
+	case 0x6:
+		size = 2;
+		dram_timing = &dram_timing_2gb;
+		break;
+	case 0x5:
+		size = 1;
+		dram_timing = &dram_timing_1gb;
+		break;
+	default:
+		puts("Unknown DDR type!!!\n");
+		return;
+	}
+
+	printf("%s: LPDDR4 %d GiB\n", __func__, size);
+	ddr_init(dram_timing);
+	writel(size, M4_BOOTROM_BASE_ADDR);
+}
+
+#define USDHC2_CD_GPIO	IMX_GPIO_NR(2, 12)
+#define USDHC1_PWR_GPIO IMX_GPIO_NR(2, 10)
+#define USDHC2_PWR_GPIO IMX_GPIO_NR(2, 19)
+
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
+	int ret = 0;
+
+	switch (cfg->esdhc_base) {
+	case USDHC1_BASE_ADDR:
+		ret = 1;
+		break;
+	case USDHC2_BASE_ADDR:
+		ret = !gpio_get_value(USDHC2_CD_GPIO);
+		return ret;
+	}
+
+	return 1;
+}
+
+#define USDHC_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE | \
+			 PAD_CTL_FSEL2)
+#define USDHC_GPIO_PAD_CTRL (PAD_CTL_PUE | PAD_CTL_DSE1)
+
+static iomux_v3_cfg_t const usdhc1_pads[] = {
+	IMX8MQ_PAD_SD1_CLK__USDHC1_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_CMD__USDHC1_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA0__USDHC1_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA1__USDHC1_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA2__USDHC1_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA3__USDHC1_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA4__USDHC1_DATA4 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA5__USDHC1_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA6__USDHC1_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_DATA7__USDHC1_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD1_RESET_B__GPIO2_IO10 | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+static iomux_v3_cfg_t const usdhc2_pads[] = {
+	IMX8MQ_PAD_SD2_CLK__USDHC2_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_CMD__USDHC2_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_DATA0__USDHC2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_DATA1__USDHC2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_DATA2__USDHC2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_DATA3__USDHC2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	IMX8MQ_PAD_SD2_CD_B__GPIO2_IO12 | MUX_PAD_CTRL(USDHC_GPIO_PAD_CTRL),
+	IMX8MQ_PAD_SD2_RESET_B__GPIO2_IO19 | MUX_PAD_CTRL(USDHC_GPIO_PAD_CTRL),
+};
+
+static struct fsl_esdhc_cfg usdhc_cfg[2] = {
+	{USDHC1_BASE_ADDR, 0, 8},
+	{USDHC2_BASE_ADDR, 0, 4},
+};
+
+int board_mmc_init(bd_t *bis)
+{
+	int ret;
+	/*
+	 * According to the board_mmc_init() the following map is done:
+	 * (U-Boot device node)    (Physical Port)
+	 * mmc0                    USDHC1
+	 * mmc1                    USDHC2
+	 */
+	init_clk_usdhc(0);
+	usdhc_cfg[0].sdhc_clk = mxc_get_clock(USDHC1_CLK_ROOT);
+	imx_iomux_v3_setup_multiple_pads(usdhc1_pads, ARRAY_SIZE(usdhc1_pads));
+	gpio_request(USDHC1_PWR_GPIO, "usdhc1_reset");
+	gpio_direction_output(USDHC1_PWR_GPIO, 0);
+	udelay(500);
+	gpio_direction_output(USDHC1_PWR_GPIO, 1);
+	ret = fsl_esdhc_initialize(bis, &usdhc_cfg[0]);
+	if (ret)
+		return ret;
+
+	init_clk_usdhc(1);
+	usdhc_cfg[1].sdhc_clk = mxc_get_clock(USDHC2_CLK_ROOT);
+	imx_iomux_v3_setup_multiple_pads(usdhc2_pads, ARRAY_SIZE(usdhc2_pads));
+	gpio_request(USDHC2_PWR_GPIO, "usdhc2_reset");
+	gpio_direction_output(USDHC2_PWR_GPIO, 0);
+	udelay(500);
+	gpio_direction_output(USDHC2_PWR_GPIO, 1);
+	return fsl_esdhc_initialize(bis, &usdhc_cfg[1]);
+}
+
+void spl_board_init(void)
+{
+	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
+
+void board_init_f(ulong dummy)
+{
+	int ret;
+
+	/* Clear global data */
+	memset((void *)gd, 0, sizeof(gd_t));
+
+	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_init();
+	if (ret) {
+		debug("spl_init() failed: %d\n", ret);
+		hang();
+	}
+
+	enable_tzc380();
+
+	/* DDR initialization */
+	spl_dram_init();
+
+	board_init_r(NULL, 0);
+}