imx: Add MYiR Tech MYS-6ULX support

MYS-6ULX is single board computer (SBC) comes with eMMC or NAND based
on imx6ULL SoC from NXP and provision for expansion board. This
commit adds support only for SBC with NAND.

CPU:   Freescale i.MX6ULL rev1.1 528 MHz (running at 396 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 45C
Reset cause: WDOG
Model: MYiR i.MX6ULL MYS-6ULX Single Board Computer with NAND
Board: MYiR MYS-6ULX 6ULL Single Board Computer
DRAM:  256 MiB
NAND:  256 MiB
MMC:   FSL_SDHC: 0
In:    serial@2020000
Out:   serial@2020000
Err:   serial@2020000
Net:   FEC0

Working:
 - Eth0
 - MMC/SD
 - NAND
 - UART 1
 - USB host

Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com>

6 files changed, 400 insertions, 0 deletions

diff --git a/board/myir/mys_6ulx/Kconfig b/board/myir/mys_6ulx/Kconfig
new file mode 100644
index 0000000000..cbf72c6eca
--- /dev/null
+++ b/board/myir/mys_6ulx/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_MYS_6ULX
+
+config SYS_BOARD
+	default "mys_6ulx"
+
+config SYS_VENDOR
+	default "myir"
+
+config SYS_CONFIG_NAME
+	default "mys_6ulx"
+
+endif
diff --git a/board/myir/mys_6ulx/MAINTAINERS b/board/myir/mys_6ulx/MAINTAINERS
new file mode 100644
index 0000000000..d4ee661182
--- /dev/null
+++ b/board/myir/mys_6ulx/MAINTAINERS
@@ -0,0 +1,9 @@
+MYS_6ULX BOARD
+M:	Parthiban Nallathambi <parthiban@linumiz.com>
+S:	Maintained
+F:	arch/arm/dts/imx6ull-myir-mys-6ulx-nand.dts
+F:	arch/arm/dts/imx6ull-myir-mys-6ulx.dtsi
+F:	arch/arm/dts/imx6ull-mys-6ulx-u-boot.dtsi
+F:	board/myir/mys_6ulx/
+F:	configs/myir_mys_6ulx_defconfig
+F:	include/configs/mys_6ulx.h
diff --git a/board/myir/mys_6ulx/Makefile b/board/myir/mys_6ulx/Makefile
new file mode 100644
index 0000000000..3c63e439ab
--- /dev/null
+++ b/board/myir/mys_6ulx/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier:	GPL-2.0+
+
+obj-y  := mys_6ulx.o
+obj-$(CONFIG_SPL_BUILD) += spl.o
diff --git a/board/myir/mys_6ulx/README b/board/myir/mys_6ulx/README
new file mode 100644
index 0000000000..a0996659c9
--- /dev/null
+++ b/board/myir/mys_6ulx/README
@@ -0,0 +1,52 @@
+How to use U-Boot on MYiR MYS-6ULX Single Board Computer
+--------------------------------------------------------
+
+- Configure and build U-Boot for MYS-6ULX iMX6ULL:
+
+    $ make mrproper
+    $ make myir_mys_6ulx_defconfig
+    $ make
+
+  This will generate SPL and u-boot-dtb.img images.
+
+Boot from MMC/SD:
+- The SPL and u-boot-dtb.img images need to be flashed into the micro SD card:
+
+    $ sudo dd if=SPL of=/dev/mmcblk0 bs=1k seek=1; sync
+    $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=69; sync
+
+- Boot mode settings:
+
+  Boot switch position: SW1 -> 0
+			SW2 -> 1
+			SW3 -> 0
+			SW4 -> 1
+
+Boot from NAND:
+- Boot the board using SD/MMC or Serial download and load the SPL into memory
+either from SD/MMC or TFTP.
+
+Default MTD layout is 512k(spl),1m(uboot),1m(uboot-dup),-(ubi)
+
+Flash SPL to NAND from SD/MMC,
+
+    $ ext4load mmc 0:2 $loadaddr SPL
+    $ nand erase.part spl
+    $ nandbcb init $loadaddr 0x0 $filesize
+
+Flash u-boot proper to NAND from SD/MMC,
+
+    $ ext4load mmc 0:2 $loadaddr u-boot-dtb.img
+    $ nand erase.part uboot
+    $ nand write $loadaddr uboot $filesize
+
+- Boot mode settings:
+
+  Boot switch position: SW1 -> 1
+			SW2 -> 0
+			SW3 -> 0
+			SW4 -> 1
+
+- Connect the Serial cable to UART0 and the PC for the console.
+
+- Reset the board using and U-Boot should boot from NAND.
diff --git a/board/myir/mys_6ulx/mys_6ulx.c b/board/myir/mys_6ulx/mys_6ulx.c
new file mode 100644
index 0000000000..d886af05be
--- /dev/null
+++ b/board/myir/mys_6ulx/mys_6ulx.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Linumiz
+ * Author: Parthiban Nallathambi <parthiban@linumiz.com>
+ */
+
+#include <init.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/arch/mx6-pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm/mach-imx/mxc_i2c.h>
+#include <fsl_esdhc_imx.h>
+#include <linux/bitops.h>
+#include <miiphy.h>
+#include <netdev.h>
+#include <usb.h>
+#include <usb/ehci-ci.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
+
+	return 0;
+}
+
+#define UART_PAD_CTRL  (PAD_CTL_PKE         | PAD_CTL_PUE       | \
+			PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | \
+			PAD_CTL_DSE_40ohm   | PAD_CTL_SRE_FAST  | \
+			PAD_CTL_HYS)
+
+static iomux_v3_cfg_t const uart1_pads[] = {
+	MX6_PAD_UART1_TX_DATA__UART1_DCE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_UART1_RX_DATA__UART1_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+};
+
+static iomux_v3_cfg_t const uart5_pads[] = {
+	MX6_PAD_UART5_TX_DATA__UART5_DCE_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_UART5_RX_DATA__UART5_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_GPIO1_IO09__UART5_DCE_CTS | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_GPIO1_IO08__UART5_DCE_RTS | MUX_PAD_CTRL(UART_PAD_CTRL),
+};
+
+static void setup_iomux_uart(void)
+{
+	imx_iomux_v3_setup_multiple_pads(uart1_pads, ARRAY_SIZE(uart1_pads));
+	imx_iomux_v3_setup_multiple_pads(uart5_pads, ARRAY_SIZE(uart5_pads));
+}
+
+#ifdef CONFIG_FEC_MXC
+
+static int setup_fec(void)
+{
+	struct iomuxc *const iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
+	int ret;
+
+	/*
+	 * Use 50M anatop loopback REF_CLK1 for ENET1,
+	 * clear gpr1[13], set gpr1[17].
+	 */
+	clrsetbits_le32(&iomuxc_regs->gpr[1], IOMUX_GPR1_FEC1_MASK,
+			IOMUX_GPR1_FEC1_CLOCK_MUX1_SEL_MASK);
+
+	ret = enable_fec_anatop_clock(0, ENET_50MHZ);
+	if (ret)
+		return ret;
+
+	enable_enet_clk(1);
+
+	return 0;
+}
+
+int board_phy_config(struct phy_device *phydev)
+{
+	/*
+	 * Defaults + Enable status LEDs (LED1: Activity, LED0: Link) & select
+	 * 50 MHz RMII clock mode.
+	 */
+	phy_write(phydev, MDIO_DEVAD_NONE, 0x1f, 0x8190);
+
+	if (phydev->drv->config)
+		phydev->drv->config(phydev);
+
+	return 0;
+}
+#endif /* CONFIG_FEC_MXC */
+
+int board_early_init_f(void)
+{
+	setup_iomux_uart();
+
+	return 0;
+}
+
+int board_init(void)
+{
+	/* Address of boot parameters */
+	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
+
+#ifdef CONFIG_FEC_MXC
+	setup_fec();
+#endif
+	return 0;
+}
+
+int checkboard(void)
+{
+	u32 cpurev = get_cpu_rev();
+
+	printf("Board: MYiR MYS-6ULX %s Single Board Computer\n",
+	       get_imx_type((cpurev & 0xFF000) >> 12));
+
+	return 0;
+}
diff --git a/board/myir/mys_6ulx/spl.c b/board/myir/mys_6ulx/spl.c
new file mode 100644
index 0000000000..5cd4d05283
--- /dev/null
+++ b/board/myir/mys_6ulx/spl.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Linumiz
+ * Author: Parthiban Nallathambi <parthiban@linumiz.com>
+ */
+
+#include <common.h>
+#include <init.h>
+#include <spl.h>
+#include <asm/arch/clock.h>
+#include <asm/io.h>
+#include <asm/arch/mx6-ddr.h>
+#include <asm/arch/mx6-pins.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/arch/sys_proto.h>
+#include <fsl_esdhc_imx.h>
+
+/* Configuration for Micron MT41K128M16JT-125, 32M x 16 x 8 -> 256MiB */
+
+static struct mx6ul_iomux_grp_regs mx6_grp_ioregs = {
+	.grp_addds = 0x00000030,
+	.grp_ddrmode_ctl = 0x00020000,
+	.grp_b0ds = 0x00000030,
+	.grp_ctlds = 0x00000030,
+	.grp_b1ds = 0x00000030,
+	.grp_ddrpke = 0x00000000,
+	.grp_ddrmode = 0x00020000,
+	.grp_ddr_type = 0x000c0000,
+};
+
+static struct mx6ul_iomux_ddr_regs mx6_ddr_ioregs = {
+	.dram_dqm0 = 0x00000030,
+	.dram_dqm1 = 0x00000030,
+	.dram_ras = 0x00000030,
+	.dram_cas = 0x00000030,
+	.dram_odt0 = 0x00000030,
+	.dram_odt1 = 0x00000030,
+	.dram_sdba2 = 0x00000000,
+	.dram_sdclk_0 = 0x00000030,
+	.dram_sdqs0 = 0x00000030,
+	.dram_sdqs1 = 0x00000030,
+	.dram_reset = 0x00000030,
+};
+
+static struct mx6_mmdc_calibration mx6_mmcd_calib = {
+	.p0_mpwldectrl0 = 0x00000000,
+	.p0_mpdgctrl0 = 0x41480148,
+	.p0_mprddlctl = 0x40403E42,
+	.p0_mpwrdlctl = 0x40405852,
+};
+
+struct mx6_ddr_sysinfo ddr_sysinfo = {
+	.dsize = 0,		/* Bus size = 16bit */
+	.cs_density = 32,
+	.ncs = 1,
+	.cs1_mirror = 0,
+	.rtt_wr = 1,
+	.rtt_nom = 1,
+	.walat = 1,		/* Write additional latency */
+	.ralat = 5,		/* Read additional latency */
+	.mif3_mode = 3,		/* Command prediction working mode */
+	.bi_on = 1,		/* Bank interleaving enabled */
+	.pd_fast_exit = 1,
+	.sde_to_rst = 0x10,	/* 14 cycles, 200us (JEDEC default) */
+	.rst_to_cke = 0x23,	/* 33 cycles, 500us (JEDEC default) */
+	.ddr_type = DDR_TYPE_DDR3,
+	.refsel = 1,		/* Refresh cycles at 32KHz */
+	.refr = 7,		/* 8 refresh commands per refresh cycle */
+};
+
+/* MT41K128M16JT-125 (2Gb density) */
+static struct mx6_ddr3_cfg mem_ddr = {
+	.mem_speed = 1600,
+	.density = 2,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1375,
+	.trcmin = 4875,
+	.trasmin = 3500,
+};
+
+static void ccgr_init(void)
+{
+	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	writel(0xFFFFFFFF, &ccm->CCGR0);
+	writel(0xFFFFFFFF, &ccm->CCGR1);
+	writel(0xFFFFFFFF, &ccm->CCGR2);
+	writel(0xFFFFFFFF, &ccm->CCGR3);
+	writel(0xFFFFFFFF, &ccm->CCGR4);
+	writel(0xFFFFFFFF, &ccm->CCGR5);
+	writel(0xFFFFFFFF, &ccm->CCGR6);
+}
+
+static void spl_dram_init(void)
+{
+	mx6ul_dram_iocfg(mem_ddr.width, &mx6_ddr_ioregs, &mx6_grp_ioregs);
+	mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_calib, &mem_ddr);
+}
+
+#ifdef CONFIG_FSL_ESDHC_IMX
+
+#define USDHC_PAD_CTRL (PAD_CTL_PKE         | PAD_CTL_PUE       | \
+			PAD_CTL_PUS_22K_UP  | PAD_CTL_SPEED_LOW | \
+			PAD_CTL_DSE_80ohm   | PAD_CTL_SRE_FAST  | \
+			PAD_CTL_HYS)
+
+static iomux_v3_cfg_t const usdhc1_pads[] = {
+	MX6_PAD_SD1_CLK__USDHC1_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_CMD__USDHC1_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA0__USDHC1_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA1__USDHC1_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA2__USDHC1_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_SD1_DATA3__USDHC1_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_UART1_RTS_B__USDHC1_CD_B | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+};
+
+#ifndef CONFIG_NAND_MXS
+static iomux_v3_cfg_t const usdhc2_pads[] = {
+	MX6_PAD_NAND_RE_B__USDHC2_CLK    | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_WE_B__USDHC2_CMD    | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA00__USDHC2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA01__USDHC2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA02__USDHC2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA03__USDHC2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA04__USDHC2_DATA4 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA05__USDHC2_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA06__USDHC2_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+	MX6_PAD_NAND_DATA07__USDHC2_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
+};
+#endif
+
+static struct fsl_esdhc_cfg usdhc_cfg[] = {
+	{
+		.esdhc_base = USDHC1_BASE_ADDR,
+		.max_bus_width = 4,
+	},
+#ifndef CONFIG_NAND_MXS
+	{
+		.esdhc_base = USDHC2_BASE_ADDR,
+		.max_bus_width = 8,
+	},
+#endif
+};
+
+int board_mmc_getcd(struct mmc *mmc)
+{
+	return 1;
+}
+
+int board_mmc_init(struct bd_info *bis)
+{
+	int i, ret;
+
+	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
+		switch (i) {
+		case 0:
+			SETUP_IOMUX_PADS(usdhc1_pads);
+			usdhc_cfg[i].sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+			break;
+#ifndef CONFIG_NAND_MXS
+		case 1:
+			SETUP_IOMUX_PADS(usdhc2_pads);
+			usdhc_cfg[i].sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+			break;
+#endif
+		default:
+			printf("Warning - USDHC%d controller not supporting\n",
+			       i + 1);
+			return 0;
+		}
+
+		ret = fsl_esdhc_initialize(bis, &usdhc_cfg[i]);
+		if (ret) {
+			printf("Warning: failed to initialize mmc dev %d\n", i);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+#endif /* CONFIG_FSL_ESDHC_IMX */
+
+void board_init_f(ulong dummy)
+{
+	ccgr_init();
+
+	/* Setup AIPS and disable watchdog */
+	arch_cpu_init();
+
+	/* Setup iomux and fec */
+	board_early_init_f();
+
+	/* Setup GP timer */
+	timer_init();
+
+	/* UART clocks enabled and gd valid - init serial console */
+	preloader_console_init();
+
+	/* DDR initialization */
+	spl_dram_init();
+}