ARM: tegra: add core Tegra186 support

This adds the bare minimum code to support Tegra186, with UART and eMMC
working.

The empty gpio.h is required because <asm/gpio.h> includes it. A future
cleanup round may be able to solve this for all Tegra generations at once.

mach-tegra/Makefile is adjusted not to compile anything for Tegra186, but
instead to defer everything to mach-tegra/tegra186/Makefile. This allows
the SoC code to pick-and-choose which of the C files in the "common"
mach-tegra/ directory to compile in based on the SoC's needs. Most of the
code is not valid for Tegra186, and this approach removes the need for
mach-tegra/Makefile to contain many SoC-specific ifdefs. This approach
may be applied to all other Tegra SoCs in a future cleanup round.

board186.c is introduced to replace board.c and board2.c. These files
currently contain a slew of SoC- and board-specific code that is not
valid for Tegra186. This approach avoids adding yet more ifdefs to those
files. A future cleanup round may refactor most of board*.c into board-/
SoC-specific functions files thus allowing the top-level functions like
board_init_early_f to be shared again.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/dts/tegra186.dtsi

@@ -0,0 +1,56 @@
+#include "skeleton.dtsi"
+#include <dt-bindings/gpio/tegra-gpio.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	compatible = "nvidia,tegra186";
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	gpio@2200000 {
+		compatible = "nvidia,tegra186-gpio";
+		reg-names = "security", "gpio";
+		reg =
+			<0x0 0x2200000 0x0 0x10000>,
+			<0x0 0x2210000 0x0 0x10000>;
+		interrupts =
+			<GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 180 IRQ_TYPE_LEVEL_HIGH>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+	};
+
+	uarta: serial@3100000 {
+		compatible = "nvidia,tegra186-uart", "nvidia,tegra20-uart";
+		reg = <0x0 0x03100000 0x0 0x10000>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	sdhci@3460000 {
+		compatible = "nvidia,tegra186-sdhci";
+		reg = <0x0 0x03460000 0x0 0x200>;
+		interrupts = <GIC_SPI 31 0x04>;
+		status = "disabled";
+	};
+
+	gpio@c2f0000 {
+		compatible = "nvidia,tegra186-gpio-aon";
+		reg-names = "security", "gpio";
+		reg =
+			<0x0 0xc2f0000 0x0 0x1000>,
+			<0x0 0xc2f1000 0x0 0x1000>;
+		interrupts =
+			<GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+	};
+};

arch/arm/include/asm/arch-tegra186/gpio.h

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA186_GPIO_H_
+#define _TEGRA186_GPIO_H_
+
+#endif

arch/arm/include/asm/arch-tegra186/tegra.h

@@ -0,0 +1,16 @@
+/*
+ * (C) Copyright 2013-2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA186_TEGRA_H_
+#define _TEGRA186_TEGRA_H_
+
+#define GICD_BASE		0x03881000	/* Generic Int Cntrlr Distrib */
+#define GICC_BASE		0x03882000	/* Generic Int Cntrlr CPU I/F */
+#define NV_PA_SDRAM_BASE	0x80000000
+
+#include <asm/arch-tegra/tegra.h>
+
+#endif

arch/arm/mach-tegra/Kconfig

@@ -54,6 +54,11 @@ config TEGRA210
 	select TEGRA_GPIO
 	select TEGRA_ARMV8_COMMON
 
+config TEGRA186
+	bool "Tegra186 family"
+	select TEGRA186_GPIO
+	select TEGRA_ARMV8_COMMON
+
 endchoice
 
 config TEGRA_DISCONNECT_UDC_ON_BOOT
@@ -77,5 +82,6 @@ source "arch/arm/mach-tegra/tegra30/Kconfig"
 source "arch/arm/mach-tegra/tegra114/Kconfig"
 source "arch/arm/mach-tegra/tegra124/Kconfig"
 source "arch/arm/mach-tegra/tegra210/Kconfig"
+source "arch/arm/mach-tegra/tegra186/Kconfig"
 
 endif

arch/arm/mach-tegra/Makefile

@@ -7,6 +7,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+ifndef CONFIG_TEGRA186
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o
 obj-y += cpu.o
@@ -30,9 +31,11 @@ obj-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_ARMV7_PSCI) += psci.o
 endif
+endif
 
 obj-$(CONFIG_TEGRA20) += tegra20/
 obj-$(CONFIG_TEGRA30) += tegra30/
 obj-$(CONFIG_TEGRA114) += tegra114/
 obj-$(CONFIG_TEGRA124) += tegra124/
+obj-$(CONFIG_TEGRA186) += tegra186/
 obj-$(CONFIG_TEGRA210) += tegra210/

arch/arm/mach-tegra/board186.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch-tegra/mmc.h>
+#include <asm/arch-tegra/tegra_mmc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	gd->ram_size = (1.5 * 1024 * 1024 * 1024);
+	return 0;
+}
+
+int board_early_init_f(void)
+{
+	return 0;
+}
+
+int board_init(void)
+{
+	return 0;
+}
+
+int board_late_init(void)
+{
+	return 0;
+}
+
+void dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+void pad_init_mmc(struct mmc_host *host)
+{
+}
+
+int board_mmc_init(bd_t *bd)
+{
+	tegra_mmc_init();
+
+	return 0;
+}
+
+int ft_system_setup(void *blob, bd_t *bd)
+{
+	return 0;
+}

arch/arm/mach-tegra/tegra186/Kconfig

@@ -0,0 +1,15 @@
+# Copyright (c) 2016, NVIDIA CORPORATION.
+#
+# SPDX-License-Identifier: GPL-2.0
+
+if TEGRA186
+
+choice
+	prompt "Tegra186 board select"
+
+endchoice
+
+config SYS_SOC
+	default "tegra186"
+
+endif

arch/arm/mach-tegra/tegra186/Makefile

@@ -0,0 +1,8 @@
+# Copyright (c) 2016, NVIDIA CORPORATION.
+#
+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += ../arm64-mmu.o
+obj-y += ../board186.o
+obj-y += ../lowlevel_init.o
+obj-$(CONFIG_DISPLAY_CPUINFO) += ../sys_info.o

include/configs/tegra186-common.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2013-2016, NVIDIA CORPORATION.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef _TEGRA186_COMMON_H_
+#define _TEGRA186_COMMON_H_
+
+#include "tegra-common.h"
+
+/* Cortex-A57 uses a cache line size of 64 bytes */
+#define CONFIG_SYS_CACHELINE_SIZE	64
+
+/*
+ * NS16550 Configuration
+ */
+#define V_NS16550_CLK		408000000	/* 408MHz (pllp_out0) */
+
+/*
+ * Miscellaneous configurable options
+ */
+#define CONFIG_STACKBASE	0x82800000	/* 40MB */
+
+/*-----------------------------------------------------------------------
+ * Physical Memory Map
+ */
+
+#define CONFIG_SYS_TEXT_BASE	0x80080000
+
+/* Generic Interrupt Controller */
+#define CONFIG_GICV2
+
+/*
+ * Memory layout for where various images get loaded by boot scripts:
+ *
+ * scriptaddr can be pretty much anywhere that doesn't conflict with something
+ *   else. Put it above BOOTMAPSZ to eliminate conflicts.
+ *
+ * pxefile_addr_r can be pretty much anywhere that doesn't conflict with
+ *   something else. Put it above BOOTMAPSZ to eliminate conflicts.
+ *
+ * kernel_addr_r must be within the first 128M of RAM in order for the
+ *   kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will
+ *   decompress itself to 0x8000 after the start of RAM, kernel_addr_r
+ *   should not overlap that area, or the kernel will have to copy itself
+ *   somewhere else before decompression. Similarly, the address of any other
+ *   data passed to the kernel shouldn't overlap the start of RAM. Pushing
+ *   this up to 16M allows for a sizable kernel to be decompressed below the
+ *   compressed load address.
+ *
+ * fdt_addr_r simply shouldn't overlap anything else. Choosing 32M allows for
+ *   the compressed kernel to be up to 16M too.
+ *
+ * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows
+ *   for the FDT/DTB to be up to 1M, which is hopefully plenty.
+ */
+#define CONFIG_LOADADDR 0x80080000
+#define MEM_LAYOUT_ENV_SETTINGS \
+	"scriptaddr=0x90000000\0" \
+	"pxefile_addr_r=0x90100000\0" \
+	"kernel_addr_r=" __stringify(CONFIG_LOADADDR) "\0" \
+	"fdt_addr_r=0x82000000\0" \
+	"ramdisk_addr_r=0x82100000\0"
+
+/* Defines for SPL */
+#define CONFIG_SPL_TEXT_BASE		0x80108000
+#define CONFIG_SYS_SPL_MALLOC_START	0x80090000
+#define CONFIG_SPL_STACK		0x800ffffc
+
+#endif