Add i.MX7D based Meerkat96 board support

The Meerkat96 board, based on the NXP i.MX7D SoC, is a member of
96Boards community and complies with all Consumer Edition board
specifications.

https://www.novtech.com/products/meerkat96.html
https://www.96boards.org/product/imx7-96/

The initial supported/tested devices include:
 - Debug serial
 - SD
 - USB Host (with Ethernet)

With these support, it's good enough for loading Linux Kernel from SD or
Ethernet over USB.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

6 files changed, 235 insertions, 0 deletions

diff --git a/board/novtech/meerkat96/Kconfig b/board/novtech/meerkat96/Kconfig
new file mode 100644
index 0000000000..b0e46fcc1b
--- /dev/null
+++ b/board/novtech/meerkat96/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_MEERKAT96
+
+config SYS_BOARD
+	default "meerkat96"
+
+config SYS_VENDOR
+	default "novtech"
+
+config SYS_CONFIG_NAME
+	default "meerkat96"
+
+endif
diff --git a/board/novtech/meerkat96/MAINTAINERS b/board/novtech/meerkat96/MAINTAINERS
new file mode 100644
index 0000000000..0eca2940d5
--- /dev/null
+++ b/board/novtech/meerkat96/MAINTAINERS
@@ -0,0 +1,6 @@
+MEERKAT96 BOARD
+M:	Shawn Guo <shawn.guo@kernel.org>
+S:	Maintained
+F:	board/novtech/meerkat96
+F:	include/configs/meerkat96.h
+F:	configs/meerkat96_defconfig
diff --git a/board/novtech/meerkat96/Makefile b/board/novtech/meerkat96/Makefile
new file mode 100644
index 0000000000..f27e05641b
--- /dev/null
+++ b/board/novtech/meerkat96/Makefile
@@ -0,0 +1 @@
+obj-y := meerkat96.o
diff --git a/board/novtech/meerkat96/README b/board/novtech/meerkat96/README
new file mode 100644
index 0000000000..bca2fad5a2
--- /dev/null
+++ b/board/novtech/meerkat96/README
@@ -0,0 +1,18 @@
+* Build U-Boot for Meerkat96 board
+
+  $ make mrproper
+  $ make meerkat96_defconfig
+  $ make
+
+  It will generate the U-Boot binary called u-boot-dtb.imx
+
+* Install U-Boot to MicroSD card
+
+  Plug MicroSD card to a Linux machine (with card reader), find the
+  device name and replace sd[x] with the name in the following command.
+
+  $ sudo dd if=u-boot-dtb.imx of=/dev/sd[x] bs=512 seek=2
+
+  It will install U-Boot to MicroSD card at 1KiB offset.  Insert the
+  card to Meerkat96 MicroSD slot, power up the board, and U-Boot should
+  boot from the card.
diff --git a/board/novtech/meerkat96/imximage.cfg b/board/novtech/meerkat96/imximage.cfg
new file mode 100644
index 0000000000..3bd8cc55e5
--- /dev/null
+++ b/board/novtech/meerkat96/imximage.cfg
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * Refer docs/README.imxmage for more details about how-to configure
+ * and create imximage boot image
+ *
+ * The syntax is taken as close as possible with the kwbimage
+ */
+
+#define __ASSEMBLY__
+#include <config.h>
+
+/* image version */
+
+IMAGE_VERSION 2
+
+/*
+ * Boot Device : sd
+ */
+
+BOOT_FROM	sd
+
+/*
+ * Secure boot support
+ */
+#ifdef CONFIG_SECURE_BOOT
+CSF CONFIG_CSF_SIZE
+#endif
+
+/*
+ * Device Configuration Data (DCD)
+ *
+ * Each entry must have the format:
+ * Addr-type           Address        Value
+ *
+ * where:
+ *	Addr-type register length (1,2 or 4 bytes)
+ *	Address	  absolute address of the register
+ *	value	  value to be stored in the register
+ */
+
+/* Enable OCRAM EPDC */
+DATA 4 0x30340004 0x4F400005
+
+/* =============================================================================
+ * DDR Controller Registers
+ * =============================================================================
+ * Memory type:           DDR3
+ * Manufacturer:          ISSI
+ * Device Part Number:    IS43TR16256AL-125KBL
+ * Clock Freq.:           533MHz
+ * Density per CS in Gb:  4
+ * Chip Selects used:     1
+ * Number of Banks:       8
+ * Row address:          15
+ * Column address:       10
+ * Data bus width:       16
+ * ROW-BANK interleave:  ENABLED
+ * =============================================================================
+ */
+
+DATA 4 0x30391000 0x00000002    // deassert presetn
+DATA 4 0x307A0000 0x01041001    // DDRC_MSTR
+DATA 4 0x307A0064 0x00400046    // DDRC_RFSHTMG
+DATA 4 0x307a0490 0x00000001    // DDRC_PCTRL_0
+DATA 4 0x307A00D4 0x00690000    // DDRC_INIT1
+DATA 4 0x307A00D0 0x00020083    // DDRC_INIT0
+DATA 4 0x307A00DC 0x09300004    // DDRC_INIT3
+DATA 4 0x307A00E0 0x04080000    // DDRC_INIT4
+DATA 4 0x307A00E4 0x00100004    // DDRC_INIT5
+DATA 4 0x307A00F4 0x0000033F    // DDRC_RANKCTL
+DATA 4 0x307A0100 0x090B1109    // DDRC_DRAMTMG0
+DATA 4 0x307A0104 0x0007020D    // DDRC_DRAMTMG1
+DATA 4 0x307A0108 0x03040407    // DDRC_DRAMTMG2
+DATA 4 0x307A010C 0x00002006    // DDRC_DRAMTMG3
+DATA 4 0x307A0110 0x04020205    // DDRC_DRAMTMG4
+DATA 4 0x307A0114 0x03030202    // DDRC_DRAMTMG5
+DATA 4 0x307A0120 0x00000803    // DDRC_DRAMTMG8
+DATA 4 0x307A0180 0x00800020    // DDRC_ZQCTL0
+DATA 4 0x307A0190 0x02098204    // DDRC_DFITMG0
+DATA 4 0x307A0194 0x00030303    // DDRC_DFITMG1
+DATA 4 0x307A01A0 0x80400003    // DDRC_DFIUPD0
+DATA 4 0x307A01A4 0x00100020    // DDRC_DFIUPD1
+DATA 4 0x307A01A8 0x80100004    // DDRC_DFIUPD2
+DATA 4 0x307A0200 0x00000015    // DDRC_ADDRMAP0
+DATA 4 0x307A0204 0x00070707    // DDRC_ADDRMAP1
+DATA 4 0x307A0210 0x00000F0F    // DDRC_ADDRMAP4
+DATA 4 0x307A0214 0x06060606    // DDRC_ADDRMAP5
+DATA 4 0x307A0218 0x0F060606    // DDRC_ADDRMAP6
+DATA 4 0x307A0240 0x06000604    // DDRC_ODTCFG
+DATA 4 0x307A0244 0x00000001    // DDRC_ODTMAP
+
+
+/* =============================================================================
+ * PHY Control Register
+ * =============================================================================
+ */
+
+DATA 4 0x30391000 0x00000000    // deassert presetn
+DATA 4 0x30790000 0x17420F40    // DDR_PHY_PHY_CON0
+DATA 4 0x30790004 0x10210100    // DDR_PHY_PHY_CON1
+DATA 4 0x30790010 0x00060807    // DDR_PHY_PHY_CON4
+DATA 4 0x307900B0 0x1010007E    // DDR_PHY_MDLL_CON0
+DATA 4 0x3079009C 0x00000D6E    // DDR_PHY_DRVDS_CON0
+DATA 4 0x30790030 0x08080808    // DDR_PHY_OFFSET_WR_CON0
+DATA 4 0x30790020 0x08080808    // DDR_PHY_OFFSET_RD_CON0
+DATA 4 0x30790050 0x01000010    // DDR_PHY_OFFSETD_CON0
+DATA 4 0x30790050 0x00000010    // DDR_PHY_OFFSETD_CON0
+DATA 4 0x30790018 0x0000000F    // DDR_PHY_LP_CON0
+DATA 4 0x307900C0 0x0E407304    // DDR_PHY_ZQ_CON0 - Start Manual ZQ
+DATA 4 0x307900C0 0x0E447304
+DATA 4 0x307900C0 0x0E447306
+DATA 4 0x307900C0 0x0E447304    // <= NOTE: Depending on JTAG device used, may need ~ 7 us pause at this point.
+DATA 4 0x307900C0 0x0E407304    // DDR_PHY_ZQ_CON0 - End Manual ZQ
+
+
+/* =============================================================================
+ * Final Initialization start sequence
+ * =============================================================================
+ */
+
+DATA 4 0x30384130 0x00000000    // Disable Clock
+DATA 4 0x30340020 0x00000178    // IOMUX_GRP_GRP8 - Start input to PHY
+DATA 4 0x30384130 0x00000002    // Enable Clock
+/* <= NOTE: Depending on JTAG device used, may need ~ 250 us pause at this point. */
diff --git a/board/novtech/meerkat96/meerkat96.c b/board/novtech/meerkat96/meerkat96.c
new file mode 100644
index 0000000000..5fb4d43997
--- /dev/null
+++ b/board/novtech/meerkat96/meerkat96.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Linaro Ltd.
+ * Copyright (C) 2016 NXP Semiconductors
+ */
+
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/mx7-pins.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/mach-imx/iomux-v3.h>
+#include <asm/io.h>
+#include <common.h>
+#include <linux/sizes.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define UART_PAD_CTRL  (PAD_CTL_DSE_3P3V_49OHM | \
+			PAD_CTL_PUS_PU100KOHM | PAD_CTL_HYS)
+
+static iomux_v3_cfg_t const meerkat96_pads[] = {
+	/* UART6 as debug serial */
+	MX7D_PAD_SD1_CD_B__UART6_DCE_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX7D_PAD_SD1_WP__UART6_DCE_TX   | MUX_PAD_CTRL(UART_PAD_CTRL),
+	/* WDOG1 for reset */
+	MX7D_PAD_GPIO1_IO00__WDOG1_WDOG_B | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
+int dram_init(void)
+{
+	gd->ram_size = PHYS_SDRAM_SIZE;
+
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	imx_iomux_v3_setup_multiple_pads(meerkat96_pads,
+					 ARRAY_SIZE(meerkat96_pads));
+
+	return 0;
+}
+
+int board_init(void)
+{
+	/* address of boot parameters */
+	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
+
+	return 0;
+}
+
+int checkboard(void)
+{
+	char *mode;
+
+	if (IS_ENABLED(CONFIG_ARMV7_BOOT_SEC_DEFAULT))
+		mode = "secure";
+	else
+		mode = "non-secure";
+
+	printf("Board: i.MX7D Meerkat96 in %s mode\n", mode);
+
+	return 0;
+}
+
+int board_late_init(void)
+{
+	set_wdog_reset((struct wdog_regs *)WDOG1_BASE_ADDR);
+
+	return 0;
+}