ARM: MediaTek: Add support for MT8516 SoC

Add support for MediaTek MT8516 SoC. This include the file
that will initialize the SoC after boot and its device tree.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/dts/mt8516-u-boot.dtsi

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2019 BayLibre, SAS
+ * Author: Fabien Parent <fparent@baylibre.com>
+ */
+
+&infracfg {
+	u-boot,dm-pre-reloc;
+};
+
+&topckgen_ {
+	u-boot,dm-pre-reloc;
+};
+
+&topckgen_cg {
+	u-boot,dm-pre-reloc;
+};
+
+&apmixedsys {
+	u-boot,dm-pre-reloc;
+};
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+};

arch/arm/dts/mt8516.dtsi

@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2019 BayLibre, SAS
+ * Author: Fabien Parent <fparent@baylibre.com>
+ */
+
+#include <dt-bindings/clock/mt8516-clk.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	compatible = "mediatek,mt8516";
+	interrupt-parent = <&sysirq>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		enable-method = "mediatek,mt8516-smp";
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a35";
+			reg = <0x0>;
+			clock-frequency = <1300000000>;
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a35";
+			reg = <0x1>;
+			clock-frequency = <1300000000>;
+		};
+
+		cpu@2 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a35";
+			reg = <0x2>;
+			clock-frequency = <1300000000>;
+		};
+
+		cpu@3 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a35";
+			reg = <0x3>;
+			clock-frequency = <1300000000>;
+		};
+	};
+
+	topckgen: clock-controller@10000000 {
+		compatible = "mediatek,mt8516-topckgen";
+		reg = <0x10000000 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	topckgen_cg: clock-controller-cg@10000000 {
+		compatible = "mediatek,mt8516-topckgen-cg";
+		reg = <0x10000000 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	infracfg: clock-controller@10001000 {
+		compatible = "mediatek,mt8516-infracfg";
+		reg = <0x10001000 0x1000>;
+		#clock-cells = <1>;
+	};
+
+	apmixedsys: clock-controller@10018000 {
+		compatible = "mediatek,mt8516-apmixedsys";
+		reg = <0x10018000 0x710>;
+		#clock-cells = <1>;
+	};
+
+	gic: interrupt-controller@10310000 {
+		compatible = "arm,gic-400";
+		interrupt-controller;
+		#interrupt-cells = <3>;
+		interrupt-parent = <&gic>;
+		reg = <0x10310000 0x1000>,
+		      <0x10320000 0x1000>,
+		      <0x10340000 0x2000>,
+		      <0x10360000 0x2000>;
+		interrupts = <GIC_PPI 9
+			     (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
+	};
+
+	sysirq: interrupt-controller@10200620 {
+		compatible = "mediatek,sysirq";
+		interrupt-controller;
+		#interrupt-cells = <3>;
+		interrupt-parent = <&gic>;
+		reg = <0x10200620 0x20>;
+	};
+
+	watchdog: watchdog@10007000 {
+		compatible = "mediatek,wdt";
+		reg = <0x10007000 0x1000>;
+		interrupts = <GIC_SPI 198 IRQ_TYPE_EDGE_FALLING>;
+		#reset-cells = <1>;
+		status = "disabled";
+	};
+
+	pinctrl: pinctrl@10005000 {
+		compatible = "mediatek,mt8516-pinctrl";
+		reg = <0x10005000 0x1000>;
+
+		gpio: gpio-controller {
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+	};
+
+	mmc0: mmc@11120000 {
+		compatible = "mediatek,mt8516-mmc";
+		reg = <0x11120000 0x1000>;
+		interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&topckgen_cg CLK_TOP_MSDC0>,
+			 <&topckgen CLK_TOP_AHB_INFRA_SEL>,
+			 <&topckgen_cg CLK_TOP_MSDC0_INFRA>;
+		clock-names = "source", "hclk", "source_cg";
+		status = "disabled";
+	};
+
+	uart0: serial@11005000 {
+		compatible = "mediatek,hsuart";
+		reg = <0x11005000 0x1000>;
+		reg-shift = <2>;
+		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&topckgen CLK_TOP_UART0_SEL>,
+			 <&topckgen_cg CLK_TOP_UART0>;
+		clock-names = "baud","bus";
+		status = "disabled";
+	};
+};

arch/arm/mach-mediatek/Kconfig

@@ -31,6 +31,16 @@ config TARGET_MT7629
 	  including DDR3, crypto engine, 3x3 11n/ac Wi-Fi, Gigabit Ethernet,
 	  switch, USB3.0, PCIe, UART, SPI, I2C and PWM.
 
+config TARGET_MT8516
+	bool "MediaTek MT8516 SoC"
+	select ARM64
+	select ARCH_MISC_INIT
+	help
+	  The MediaTek MT8516 is a ARM64-based SoC with a quad-core Cortex-A35.
+	  including UART, SPI, USB2.0 and OTG, SD and MMC cards, NAND, PWM,
+	  Ethernet, IR TX/RX, I2C, I2S, S/PDIF, and built-in Wi-Fi / Bluetooth combo
+	  chip and several DDR3 and DDR4 options.
+
 endchoice
 
 source "board/mediatek/mt7623/Kconfig"

arch/arm/mach-mediatek/Makefile

@@ -5,3 +5,4 @@ obj-$(CONFIG_SPL_BUILD)	+= spl.o
 
 obj-$(CONFIG_TARGET_MT7623) += mt7623/
 obj-$(CONFIG_TARGET_MT7629) += mt7629/
+obj-$(CONFIG_TARGET_MT8516) += mt8516/

arch/arm/mach-mediatek/mt8516/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier:	GPL-2.0
+
+obj-y += init.o

arch/arm/mach-mediatek/mt8516/init.c

@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 MediaTek Inc.
+ * Copyright (C) 2019 BayLibre, SAS
+ * Author: Fabien Parent <fparent@baylibre.com>
+ */
+
+#include <clk.h>
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <ram.h>
+#include <asm/arch/misc.h>
+#include <asm/armv8/mmu.h>
+#include <asm/sections.h>
+#include <dm/uclass.h>
+#include <linux/io.h>
+#include <dt-bindings/clock/mt8516-clk.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define WDOG_SWRST		0x10007014
+#define WDOG_SWRST_KEY		0x1209
+
+int dram_init(void)
+{
+	int ret;
+
+	ret = fdtdec_setup_memory_banksize();
+	if (ret)
+		return ret;
+
+	return fdtdec_setup_mem_size_base();
+}
+
+int dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = gd->ram_base;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+
+	return 0;
+}
+
+int mtk_pll_early_init(void)
+{
+	unsigned long pll_rates[] = {
+		[CLK_APMIXED_ARMPLL] =   1300000000,
+		[CLK_APMIXED_MAINPLL] =  1501000000,
+		[CLK_APMIXED_UNIVPLL] =  1248000000,
+		[CLK_APMIXED_MMPLL] =     380000000,
+	};
+	struct udevice *dev;
+	int ret, i;
+
+	ret = uclass_get_device_by_driver(UCLASS_CLK,
+			DM_GET_DRIVER(mtk_clk_apmixedsys), &dev);
+	if (ret)
+		return ret;
+
+	/* configure default rate then enable apmixedsys */
+	for (i = 0; i < ARRAY_SIZE(pll_rates); i++) {
+		struct clk clk = { .id = i, .dev = dev };
+
+		ret = clk_set_rate(&clk, pll_rates[i]);
+		if (ret)
+			return ret;
+
+		ret = clk_enable(&clk);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+int mtk_soc_early_init(void)
+{
+	int ret;
+
+	/* initialize early clocks */
+	ret = mtk_pll_early_init();
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+void reset_cpu(ulong addr)
+{
+	while (1) {
+		writel(WDOG_SWRST_KEY, WDOG_SWRST);
+		mdelay(5);
+	}
+}
+
+int print_cpuinfo(void)
+{
+	printf("CPU:   MediaTek MT8516\n");
+	return 0;
+}
+
+static struct mm_region mt8516_mem_map[] = {
+	{
+		/* DDR */
+		.virt = 0x40000000UL,
+		.phys = 0x40000000UL,
+		.size = 0x20000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_OUTER_SHARE,
+	}, {
+		.virt = 0x00000000UL,
+		.phys = 0x00000000UL,
+		.size = 0x20000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
+			 PTE_BLOCK_NON_SHARE |
+			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
+	}, {
+		0,
+	}
+};
+struct mm_region *mem_map = mt8516_mem_map;