ARM: i.MX: Add liteboard support

liteboard is a development board which uses liteSOM as its
base. liteSOM can't exist on its own, but is used as part
of other boards - it only contains processor and memory.

Hardware specification:
 * liteSOM:
   - i.MX6UL
   - 256M or 512M DDR3 RAM
   - eMMC (uSDHC2)
 * Ethernet PHY
 * USB host (usb_otg1)
 * MicroSD slot (uSDHC1)

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

6 files changed, 278 insertions, 0 deletions

diff --git a/arch/arm/boards/grinn-liteboard/Makefile b/arch/arm/boards/grinn-liteboard/Makefile
new file mode 100644
index 0000000000..01c7a259e9
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/Makefile
@@ -0,0 +1,2 @@
+obj-y += board.o
+lwl-y += lowlevel.o
diff --git a/arch/arm/boards/grinn-liteboard/board.c b/arch/arm/boards/grinn-liteboard/board.c
new file mode 100644
index 0000000000..8e5a91e124
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/board.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2018 Grinn
+ *
+ * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "liteboard: " fmt
+
+#include <bootsource.h>
+#include <common.h>
+#include <envfs.h>
+#include <init.h>
+#include <mach/bbu.h>
+#include <mach/imx6.h>
+#include <malloc.h>
+#include <mfd/imx6q-iomuxc-gpr.h>
+#include <of.h>
+
+static void bbu_register_handler_sd(bool is_boot_source)
+{
+	imx6_bbu_internal_mmc_register_handler("sd", "/dev/mmc0.barebox",
+				is_boot_source ? BBU_HANDLER_FLAG_DEFAULT : 0);
+}
+
+static void bbu_register_handler_emmc(bool is_boot_source)
+{
+	int emmc_boot_flag = 0, emmc_flag = 0;
+	const char *bootpart;
+	struct device_d *dev;
+	int ret;
+
+	if (!is_boot_source)
+		goto bbu_register;
+
+	dev = get_device_by_name("mmc1");
+	if (!dev) {
+		pr_warn("Failed to get eMMC device\n");
+		goto bbu_register;
+	}
+
+	ret = device_detect(dev);
+	if (ret) {
+		pr_warn("Failed to probe eMMC\n");
+		goto bbu_register;
+	}
+
+	bootpart = dev_get_param(dev, "boot");
+	if (!bootpart) {
+		pr_warn("Failed to get eMMC boot configuration\n");
+		goto bbu_register;
+	}
+
+	if (!strncmp(bootpart, "boot", 4))
+		emmc_boot_flag |= BBU_HANDLER_FLAG_DEFAULT;
+	else
+		emmc_flag |= BBU_HANDLER_FLAG_DEFAULT;
+
+bbu_register:
+	imx6_bbu_internal_mmc_register_handler("emmc", "/dev/mmc1.barebox",
+					emmc_flag);
+	imx6_bbu_internal_mmcboot_register_handler("emmc-boot", "mmc1",
+					emmc_boot_flag);
+}
+
+static const struct {
+	const char *name;
+	const char *env;
+	void (*bbu_register_handler)(bool);
+} boot_sources[] = {
+	{"SD",   "/chosen/environment-sd",   bbu_register_handler_sd},
+	{"eMMC", "/chosen/environment-emmc", bbu_register_handler_emmc},
+};
+
+static int liteboard_devices_init(void)
+{
+	int boot_source_idx = 0;
+	int ret;
+	int i;
+
+	if (!of_machine_is_compatible("grinn,imx6ul-liteboard"))
+		return 0;
+
+	barebox_set_hostname("liteboard");
+
+	if (bootsource_get() == BOOTSOURCE_MMC) {
+		int mmc_idx = bootsource_get_instance();
+
+		if (0 <= mmc_idx && mmc_idx < ARRAY_SIZE(boot_sources))
+			boot_source_idx = mmc_idx;
+	}
+
+	ret = of_device_enable_path(boot_sources[boot_source_idx].env);
+	if (ret < 0)
+		pr_warn("Failed to enable environment partition '%s' (%d)\n",
+			boot_sources[boot_source_idx].env, ret);
+
+	pr_notice("Using environment in %s\n",
+		boot_sources[boot_source_idx].name);
+
+	for (i = 0; i < ARRAY_SIZE(boot_sources); i++)
+		boot_sources[i].bbu_register_handler(boot_source_idx == i);
+
+	return 0;
+}
+device_initcall(liteboard_devices_init);
diff --git a/arch/arm/boards/grinn-liteboard/flash-header-liteboard-256mb.imxcfg b/arch/arm/boards/grinn-liteboard/flash-header-liteboard-256mb.imxcfg
new file mode 100644
index 0000000000..1b980c7846
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/flash-header-liteboard-256mb.imxcfg
@@ -0,0 +1,6 @@
+
+#define SETUP_MDASP_MDCTL		\
+	wm 32 0x021B0040 0x00000047;	\
+	wm 32 0x021B0000 0x83180000
+
+#include "flash-header-liteboard.h"
diff --git a/arch/arm/boards/grinn-liteboard/flash-header-liteboard-512mb.imxcfg b/arch/arm/boards/grinn-liteboard/flash-header-liteboard-512mb.imxcfg
new file mode 100644
index 0000000000..c93a2cc0fa
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/flash-header-liteboard-512mb.imxcfg
@@ -0,0 +1,6 @@
+
+#define SETUP_MDASP_MDCTL		\
+	wm 32 0x021B0040 0x0000004F;	\
+	wm 32 0x021B0000 0x84180000
+
+#include "flash-header-liteboard.h"
diff --git a/arch/arm/boards/grinn-liteboard/flash-header-liteboard.h b/arch/arm/boards/grinn-liteboard/flash-header-liteboard.h
new file mode 100644
index 0000000000..60a39f524b
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/flash-header-liteboard.h
@@ -0,0 +1,68 @@
+
+loadaddr 0x80000000
+soc imx6
+dcdofs 0x400
+
+wm 32 0x020c4068 0xffffffff
+wm 32 0x020c406c 0xffffffff
+wm 32 0x020c4070 0xffffffff
+wm 32 0x020c4074 0xffffffff
+wm 32 0x020c4078 0xffffffff
+wm 32 0x020c407c 0xffffffff
+wm 32 0x020c4080 0xffffffff
+
+wm 32 0x020E04B4 0x000C0000
+wm 32 0x020E04AC 0x00000000
+wm 32 0x020E027C 0x00000030
+wm 32 0x020E0250 0x00000030
+wm 32 0x020E024C 0x00000030
+wm 32 0x020E0490 0x00000030
+wm 32 0x020E0288 0x00000030
+wm 32 0x020E0270 0x00000000
+wm 32 0x020E0260 0x00000030
+wm 32 0x020E0264 0x00000030
+wm 32 0x020E04A0 0x00000030
+wm 32 0x020E0494 0x00020000
+wm 32 0x020E0280 0x00000030
+wm 32 0x020E0284 0x00000030
+wm 32 0x020E04B0 0x00020000
+wm 32 0x020E0498 0x00000030
+wm 32 0x020E04A4 0x00000030
+wm 32 0x020E0244 0x00000030
+wm 32 0x020E0248 0x00000030
+wm 32 0x021B001C 0x00008000
+wm 32 0x021B0800 0xA1390003
+wm 32 0x021B080C 0x00000000
+wm 32 0x021B083C 0x41480148
+wm 32 0x021B0848 0x40403E42
+wm 32 0x021B0850 0x40405852
+wm 32 0x021B081C 0x33333333
+wm 32 0x021B0820 0x33333333
+wm 32 0x021B082C 0xf3333333
+wm 32 0x021B0830 0xf3333333
+wm 32 0x021B08C0 0x00922012
+wm 32 0x021B0858 0x00000F00
+wm 32 0x021B08b8 0x00000800
+wm 32 0x021B0004 0x0002002D
+wm 32 0x021B0008 0x1B333030
+wm 32 0x021B000C 0x676B52F3
+wm 32 0x021B0010 0xB66D0B63
+wm 32 0x021B0014 0x01FF00DB
+wm 32 0x021B0018 0x00211740
+wm 32 0x021B001C 0x00008000
+wm 32 0x021B002C 0x000026D2
+wm 32 0x021B0030 0x006B1023
+
+SETUP_MDASP_MDCTL
+
+wm 32 0x021b0890 0x00400A38
+wm 32 0x021B001C 0x02008032
+wm 32 0x021B001C 0x00008033
+wm 32 0x021B001C 0x00048031
+wm 32 0x021B001C 0x15208030
+wm 32 0x021B001C 0x04008040
+wm 32 0x021B0020 0x00007800
+wm 32 0x021B0818 0x00000227
+wm 32 0x021B0004 0x0002556D
+wm 32 0x021B0404 0x00011006
+wm 32 0x021B001C 0x00000000
diff --git a/arch/arm/boards/grinn-liteboard/lowlevel.c b/arch/arm/boards/grinn-liteboard/lowlevel.c
new file mode 100644
index 0000000000..331ccc2283
--- /dev/null
+++ b/arch/arm/boards/grinn-liteboard/lowlevel.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2018 Grinn
+ *
+ * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <debug_ll.h>
+#include <common.h>
+#include <linux/sizes.h>
+#include <io.h>
+#include <image-metadata.h>
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <asm/sections.h>
+#include <asm/cache.h>
+#include <asm/mmu.h>
+#include <mach/esdctl.h>
+#include <mach/imx6.h>
+
+static inline void setup_uart(void)
+{
+	void __iomem *iomuxbase = IOMEM(MX6_IOMUXC_BASE_ADDR);
+	void __iomem *uart = IOMEM(MX6_UART1_BASE_ADDR);
+
+	relocate_to_current_adr();
+	setup_c();
+	barrier();
+
+	imx6_ungate_all_peripherals();
+
+	writel(0x0, iomuxbase + 0x84);
+	writel(0x1b0b1, iomuxbase + 0x0310);
+
+	imx6_uart_setup(uart);
+
+	pbl_set_putc(imx_uart_putc, uart);
+
+	putchar('>');
+}
+
+BAREBOX_IMD_TAG_STRING(liteboard_memsize_SZ_256M, IMD_TYPE_PARAMETER,
+		"memsize=256", 0);
+BAREBOX_IMD_TAG_STRING(liteboard_memsize_SZ_512M, IMD_TYPE_PARAMETER,
+		"memsize=512", 0);
+
+extern char __dtb_imx6ul_liteboard_start[];
+
+static void __noreturn start_imx6_liteboard(void)
+{
+	imx6ul_cpu_lowlevel_init();
+
+	arm_setup_stack(0x00910000 - 8);
+
+	arm_early_mmu_cache_invalidate();
+
+	if (IS_ENABLED(CONFIG_PBL_CONSOLE))
+		setup_uart();
+
+	imx6ul_barebox_entry(__dtb_imx6ul_liteboard_start +
+			get_runtime_offset());
+}
+
+#define LITEBOARD_ENTRY(name, memory_size)				\
+	ENTRY_FUNCTION(name, r0, r1, r2)				\
+	{								\
+		IMD_USED(liteboard_memsize_##memory_size);		\
+									\
+		start_imx6_liteboard();					\
+	}
+
+
+LITEBOARD_ENTRY(start_imx6ul_liteboard_256mb, SZ_256M);
+LITEBOARD_ENTRY(start_imx6ul_liteboard_512mb, SZ_512M);