arm: bcmbca: add bcm6756 SoC support

BCM6756 is an ARM A7 based WLAN Gateway and Access Point Broadband SoC.
It is part of the BCA(Broadband Carrier Access origin) chipset family so
it's added under ARCH_BCMBCA platform. This initial support includes a
bare-bone implementation and dts with CPU subsystem, memory and ARM
PL011 uart.

This SoC is supported in the linux-next git repository so the dts and
dtsi files are copied from linux.

The u-boot image can be loaded from flash or network to the entry
point address in the memory and boot from there.

Signed-off-by: William Zhang <william.zhang@broadcom.com>

MAINTAINERS

@@ -219,6 +219,7 @@ F:	board/broadcom/bcmbca/
 N:	bcmbca
 N:	bcm[9]?47622
 N:	bcm[9]?63178
+N:	bcm[9]?6756
 N:	bcm[9]?6846
 N:	bcm[9]?6878
 

arch/arm/dts/Makefile

@@ -1184,6 +1184,8 @@ dtb-$(CONFIG_BCM47622) += \
 	bcm947622.dtb
 dtb-$(CONFIG_BCM63178) += \
 	bcm963178.dtb
+dtb-$(CONFIG_BCM6756) += \
+	bcm96756.dtb
 dtb-$(CONFIG_BCM6846) += \
 	bcm96846.dtb
 dtb-$(CONFIG_BCM6878) += \

arch/arm/dts/bcm6756.dtsi

@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2022 Broadcom Ltd.
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	compatible = "brcm,bcm6756", "brcm,bcmbca";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	interrupt-parent = <&gic>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		CA7_0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x0>;
+			next-level-cache = <&L2_0>;
+			enable-method = "psci";
+		};
+
+		CA7_1: cpu@1 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x1>;
+			next-level-cache = <&L2_0>;
+			enable-method = "psci";
+		};
+
+		CA7_2: cpu@2 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x2>;
+			next-level-cache = <&L2_0>;
+			enable-method = "psci";
+		};
+
+		CA7_3: cpu@3 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x3>;
+			next-level-cache = <&L2_0>;
+			enable-method = "psci";
+		};
+
+		L2_0: l2-cache0 {
+			compatible = "cache";
+		};
+	};
+
+	timer {
+		compatible = "arm,armv7-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			<GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			<GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			<GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
+		arm,cpu-registers-not-fw-configured;
+	};
+
+	pmu: pmu {
+		compatible = "arm,cortex-a7-pmu";
+		interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-affinity = <&CA7_0>, <&CA7_1>,
+			<&CA7_2>, <&CA7_3>;
+	};
+
+	clocks: clocks {
+		periph_clk: periph-clk {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <200000000>;
+		};
+
+		uart_clk: uart-clk {
+			compatible = "fixed-factor-clock";
+			#clock-cells = <0>;
+			clocks = <&periph_clk>;
+			clock-div = <4>;
+			clock-mult = <1>;
+		};
+	};
+
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "smc";
+	};
+
+	axi@81000000 {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0x81000000 0x8000>;
+
+		gic: interrupt-controller@1000 {
+			compatible = "arm,cortex-a7-gic";
+			#interrupt-cells = <3>;
+			interrupt-controller;
+			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
+			reg = <0x1000 0x1000>,
+				<0x2000 0x2000>,
+				<0x4000 0x2000>,
+				<0x6000 0x2000>;
+		};
+	};
+
+	bus@ff800000 {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0xff800000 0x800000>;
+
+		uart0: serial@12000 {
+			compatible = "arm,pl011", "arm,primecell";
+			reg = <0x12000 0x1000>;
+			interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&uart_clk>, <&uart_clk>;
+			clock-names = "uartclk", "apb_pclk";
+			status = "disabled";
+		};
+	};
+};

arch/arm/dts/bcm96756.dts

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2019 Broadcom Ltd.
+ */
+
+/dts-v1/;
+
+#include "bcm6756.dtsi"
+
+/ {
+	model = "Broadcom BCM96756 Reference Board";
+	compatible = "brcm,bcm96756", "brcm,bcm6756", "brcm,bcmbca";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x08000000>;
+	};
+};
+
+&uart0 {
+	status = "okay";
+};

arch/arm/mach-bcmbca/Kconfig

@@ -19,6 +19,13 @@ config BCM63178
 	select DM_SERIAL
 	select PL01X_SERIAL
 
+config BCM6756
+	bool "Support for Broadcom 6756 Family"
+	select SYS_ARCH_TIMER
+	select CPU_V7A
+	select DM_SERIAL
+	select PL01X_SERIAL
+
 config BCM6846
 	bool "Support for Broadcom 6846 Family"
 	select SYS_ARCH_TIMER
@@ -35,6 +42,7 @@ config BCM6878
 
 source "arch/arm/mach-bcmbca/bcm47622/Kconfig"
 source "arch/arm/mach-bcmbca/bcm63178/Kconfig"
+source "arch/arm/mach-bcmbca/bcm6756/Kconfig"
 source "arch/arm/mach-bcmbca/bcm6846/Kconfig"
 source "arch/arm/mach-bcmbca/bcm6878/Kconfig"
 

arch/arm/mach-bcmbca/Makefile

@@ -5,5 +5,6 @@
 
 obj-$(CONFIG_BCM47622) += bcm47622/
 obj-$(CONFIG_BCM63178) += bcm63178/
+obj-$(CONFIG_BCM6756) += bcm6756/
 obj-$(CONFIG_BCM6846) += bcm6846/
 obj-$(CONFIG_BCM6878) += bcm6878/

arch/arm/mach-bcmbca/bcm6756/Kconfig

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2022 Broadcom Ltd
+#
+
+if BCM6756
+
+config TARGET_BCM96756
+	bool "Broadcom 6756 Reference Board"
+	depends on ARCH_BCMBCA
+
+config SYS_SOC
+	default "bcm6756"
+
+source "board/broadcom/bcmbca/Kconfig"
+
+endif

arch/arm/mach-bcmbca/bcm6756/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2022 Broadcom Ltd
+#
+obj- += dummy.o

board/broadcom/bcmbca/Kconfig

@@ -16,13 +16,6 @@ config SYS_CONFIG_NAME
 
 endif
 
-if TARGET_BCM96878
-
-config SYS_CONFIG_NAME
-	default "bcm96878"
-
-endif
-
 if TARGET_BCM963178
 
 config SYS_CONFIG_NAME
@@ -30,9 +23,23 @@ config SYS_CONFIG_NAME
 
 endif
 
+if TARGET_BCM96756
+
+config SYS_CONFIG_NAME
+	default "bcm96756"
+
+endif
+
 if TARGET_BCM96846
 
 config SYS_CONFIG_NAME
 	default "bcm96846"
 
 endif
+
+if TARGET_BCM96878
+
+config SYS_CONFIG_NAME
+	default "bcm96878"
+
+endif

configs/bcm96756_defconfig

@@ -0,0 +1,23 @@
+CONFIG_ARM=y
+CONFIG_COUNTER_FREQUENCY=50000000
+CONFIG_ARCH_BCMBCA=y
+CONFIG_SYS_TEXT_BASE=0x01000000
+CONFIG_SYS_MALLOC_LEN=0x2000000
+CONFIG_SYS_MALLOC_F_LEN=0x8000
+CONFIG_BCM6756=y
+CONFIG_TARGET_BCM96756=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_DEFAULT_DEVICE_TREE="bcm96756"
+CONFIG_IDENT_STRING=" Broadcom BCM6756"
+CONFIG_SYS_LOAD_ADDR=0x01000000
+CONFIG_ENV_VARS_UBOOT_CONFIG=y
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x2000000
+CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_HUSH_PARSER=y
+CONFIG_SYS_MAXARGS=64
+CONFIG_SYS_BOOTM_LEN=0x4000000
+CONFIG_CMD_CACHE=y
+CONFIG_OF_EMBED=y
+CONFIG_CLK=y

include/configs/bcm96756.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2022 Broadcom Ltd.
+ */
+
+#ifndef __BCM96756_H
+#define __BCM96756_H
+
+#define CONFIG_SYS_SDRAM_BASE		0x00000000
+
+#endif