[RFC 1/4] dt-bindings: arm: Initial MStar vendor prefixes and compatible strings

[RFC 1/4] dt-bindings: arm: Initial MStar vendor prefixes and compatible strings

[Daniel Palmer]

This adds a prefix for MStar and thingy.jp and then defines compatible
strings for the first MStar based board.
---
 .../devicetree/bindings/arm/mstar.yaml        | 22 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  6 +++--
 MAINTAINERS                                   |  6 +++++
 3 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/mstar.yaml

diff --git a/Documentation/devicetree/bindings/arm/mstar.yaml b/Documentation/devicetree/bindings/arm/mstar.yaml
new file mode 100644
index 000000000000..fbb9f8d1c06c
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/mstar.yaml
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: (GPL-2.0+ OR X11)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/mstar.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MStar platforms device tree bindings
+
+maintainers:
+  - Daniel Palmer <daniel@thingy.jp>
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+
+      - description: thingy.jp BreadBee
+        items:
+          - const: thingyjp,breadbee
+          - const: mstar,msc313e
+          - const: mstar,msc313
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 6992bbbbffab..74b8f6566dec 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -599,6 +599,8 @@ patternProperties:
     description: Microsemi Corporation
   "^msi,.*":
     description: Micro-Star International Co. Ltd.
+  "^mstar,.*":
+    description: MStar Semiconductor, Inc.
   "^mti,.*":
     description: Imagination Technologies Ltd. (formerly MIPS Technologies Inc.)
   "^multi-inno,.*":
@@ -921,8 +923,8 @@ patternProperties:
     description: Terasic Inc.
   "^tfc,.*":
     description: Three Five Corp
-  "^thine,.*":
-    description: THine Electronics, Inc.
+  "^thingyjp,.*":
+    description: thingy.jp
   "^ti,.*":
     description: Texas Instruments
   "^tianma,.*":
diff --git a/MAINTAINERS b/MAINTAINERS
index e7a47b5210fd..252fa7171aea 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1955,6 +1955,12 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 F:	arch/arm/mach-pxa/mioa701.c
 S:	Maintained
 
+ARM/MStar SoC support
+M:	Daniel Palmer <daniel@thingy.jp>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+F:	Documentation/devicetree/bindings/arm/mstar.yaml
+S:	Maintained
+
 ARM/NEC MOBILEPRO 900/c MACHINE SUPPORT
 M:	Michael Petchkovsky <mkpetch@internode.on.net>
 S:	Maintained
-- 
2.23.0


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[RFC 2/4] ARM: mstar: Add machine for MStar msc313 family SoCs

[Daniel Palmer]

Initial support for the MStar msc313 series of Cortex A7 based
IP camera SoCs.

These chips are interesting in that they contain a Cortex A7,
peripherals and system memory in a single tiny QFN package that
can be hand soldered allowing almost anyone to embed Linux
in their projects.
---
 MAINTAINERS                  |  1 +
 arch/arm/Kconfig             |  2 +
 arch/arm/Makefile            |  1 +
 arch/arm/mach-mstar/Kconfig  | 14 ++++++
 arch/arm/mach-mstar/Makefile |  1 +
 arch/arm/mach-mstar/msc313.c | 96 ++++++++++++++++++++++++++++++++++++
 6 files changed, 115 insertions(+)
 create mode 100644 arch/arm/mach-mstar/Kconfig
 create mode 100644 arch/arm/mach-mstar/Makefile
 create mode 100644 arch/arm/mach-mstar/msc313.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 252fa7171aea..b046773af438 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1959,6 +1959,7 @@ ARM/MStar SoC support
 M:	Daniel Palmer <daniel@thingy.jp>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 F:	Documentation/devicetree/bindings/arm/mstar.yaml
+F:	arch/arm/mach-mstar/
 S:	Maintained
 
 ARM/NEC MOBILEPRO 900/c MACHINE SUPPORT
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 24360211534a..c5c6d31e4301 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -760,6 +760,8 @@ source "arch/arm/mach-mmp/Kconfig"
 
 source "arch/arm/mach-moxart/Kconfig"
 
+source "arch/arm/mach-mstar/Kconfig"
+
 source "arch/arm/mach-mv78xx0/Kconfig"
 
 source "arch/arm/mach-mvebu/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c3624ca6c0bc..581e32505408 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -191,6 +191,7 @@ machine-$(CONFIG_ARCH_MXC)		+= imx
 machine-$(CONFIG_ARCH_MEDIATEK)		+= mediatek
 machine-$(CONFIG_ARCH_MILBEAUT)		+= milbeaut
 machine-$(CONFIG_ARCH_MXS)		+= mxs
+machine-$(CONFIG_ARCH_MSTAR)		+= mstar
 machine-$(CONFIG_ARCH_NOMADIK)		+= nomadik
 machine-$(CONFIG_ARCH_NPCM)		+= npcm
 machine-$(CONFIG_ARCH_NSPIRE)		+= nspire
diff --git a/arch/arm/mach-mstar/Kconfig b/arch/arm/mach-mstar/Kconfig
new file mode 100644
index 000000000000..d6b0a515da91
--- /dev/null
+++ b/arch/arm/mach-mstar/Kconfig
@@ -0,0 +1,14 @@
+menuconfig ARCH_MSTAR
+	bool "MStar SoC Support"
+	depends on ARCH_MULTI_V7
+	select ARM_GIC
+	help
+	  Support for MStar ARMv7 SoCs
+
+if ARCH_MSTAR
+
+config MACH_MSC313
+	bool "MStar MSC313(d/e) SoC support"
+	default ARCH_MSTAR
+
+endif
diff --git a/arch/arm/mach-mstar/Makefile b/arch/arm/mach-mstar/Makefile
new file mode 100644
index 000000000000..231105cdc872
--- /dev/null
+++ b/arch/arm/mach-mstar/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MACH_MSC313) += msc313.o
\ No newline at end of file
diff --git a/arch/arm/mach-mstar/msc313.c b/arch/arm/mach-mstar/msc313.c
new file mode 100644
index 000000000000..c104635f39e4
--- /dev/null
+++ b/arch/arm/mach-mstar/msc313.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree support for MStar MSC313 SoCs
+ *
+ * Copyright (c) 2019 thingy.jp
+ * Author: Daniel Palmer <daniel@thingy.jp>
+ */
+
+#include <linux/init.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <linux/of.h>
+#include <asm/io.h>
+
+/*
+ * The IO space is remapped to the same place
+ * the vendor kernel does so that the hardcoded
+ * addresses all over the vendor drivers line up.
+ */
+
+#define MSC313_IO_PHYS		0x1f000000
+#define MSC313_IO_OFFSET	0xde000000
+#define MSC313_IO_VIRT		(MSC313_IO_PHYS + MSC313_IO_OFFSET)
+#define MSC313_IO_SIZE		0x00400000
+
+/*
+ * In the u-boot code the area these registers are in is
+ * called "L3 bridge".
+ *
+ * It's not exactly known what is the L3 bridge is but
+ * the vendor code for both u-boot and linux share calls
+ * to "flush the miu pipe". This seems to be to force pending
+ * CPU writes to memory so that the state is right before
+ * DMA capable devices try to read descriptors and data
+ * the CPU has prepared. Without doing this ethernet doesn't
+ * work reliably for example.
+ */
+
+#define MSC313_L3BRIDGE_FLUSH		0x204414
+#define MSC313_L3BRIDGE_STATUS		0x204440
+#define MSC313_L3BRIDGE_FLUSH_TRIGGER	BIT(0)
+#define MSC313_L3BRIDGE_STATUS_DONE	BIT(12)
+
+static void __iomem *miu_status;
+static void __iomem *miu_flush;
+
+static struct map_desc msc313_io_desc[] __initdata = {
+		{MSC313_IO_VIRT, __phys_to_pfn(MSC313_IO_PHYS),
+				MSC313_IO_SIZE, MT_DEVICE},
+};
+
+static void __init msc313_map_io(void)
+{
+	iotable_init(msc313_io_desc, ARRAY_SIZE(msc313_io_desc));
+	miu_flush = (void __iomem *) (msc313_io_desc[0].virtual
+			+ MSC313_L3BRIDGE_FLUSH);
+	miu_status = (void __iomem *) (msc313_io_desc[0].virtual
+			+ MSC313_L3BRIDGE_STATUS);
+}
+
+static const char * const msc313_board_dt_compat[] = {
+	"mstar,msc313",
+	NULL,
+};
+
+static DEFINE_SPINLOCK(msc313_mb_lock);
+
+static void msc313_mb(void)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&msc313_mb_lock, flags);
+	/* toggle the flush miu pipe fire bit */
+	writel_relaxed(0, miu_flush);
+	writel_relaxed(MSC313_L3BRIDGE_FLUSH_TRIGGER, miu_flush);
+	while (!(readl_relaxed(miu_status) & MSC313_L3BRIDGE_STATUS_DONE)) {
+		/* wait for flush to complete */
+	}
+	spin_unlock_irqrestore(&msc313_mb_lock, flags);
+}
+
+static void __init msc313_barriers_init(void)
+{
+	soc_mb = msc313_mb;
+}
+
+static void __init msc313_init(void)
+{
+	msc313_barriers_init();
+}
+
+DT_MACHINE_START(MSTAR_DT, "MStar MSC313 (Device Tree)")
+	.dt_compat	= msc313_board_dt_compat,
+	.init_machine = msc313_init,
+	.map_io = msc313_map_io,
+MACHINE_END
-- 
2.23.0


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[RFC 3/4] ARM: mstar: Add msc313 series dtsi

[Daniel Palmer]

Adds an initial dtsi for the msc313 SoC family and a dtsi for
the msc313e part.
---
 MAINTAINERS                    |  1 +
 arch/arm/boot/dts/msc313.dtsi  | 71 ++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/msc313e.dtsi | 14 +++++++
 3 files changed, 86 insertions(+)
 create mode 100644 arch/arm/boot/dts/msc313.dtsi
 create mode 100644 arch/arm/boot/dts/msc313e.dtsi

diff --git a/MAINTAINERS b/MAINTAINERS
index b046773af438..c71c3ec3d43f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1960,6 +1960,7 @@ M:	Daniel Palmer <daniel@thingy.jp>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 F:	Documentation/devicetree/bindings/arm/mstar.yaml
 F:	arch/arm/mach-mstar/
+F:	arch/arm/boot/dts/msc313*.dtsi
 S:	Maintained
 
 ARM/NEC MOBILEPRO 900/c MACHINE SUPPORT
diff --git a/arch/arm/boot/dts/msc313.dtsi b/arch/arm/boot/dts/msc313.dtsi
new file mode 100644
index 000000000000..101582f277ff
--- /dev/null
+++ b/arch/arm/boot/dts/msc313.dtsi
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 thingy.jp.
+ * Author: Daniel Palmer <daniel@thingy.jp>
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&gic>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a7";
+			reg = <0x0>;
+		};
+	};
+
+	arch_timer {
+		compatible = "arm,armv7-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2)
+				| IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2)
+				| IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2)
+				| IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2)
+				| IRQ_TYPE_LEVEL_LOW)>;
+		clock-frequency = <6000000>;
+	};
+
+	pmu {
+		compatible = "arm,cortex-a7-pmu";
+		interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
+	};
+
+	soc: soc {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		gic: interrupt-controller@0x16001000 {
+			compatible = "arm,cortex-a7-gic";
+			#interrupt-cells = <3>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			interrupt-controller;
+			reg = <0x16001000 0x1000>,
+			      <0x16002000 0x1000>;
+		};
+
+		pm_uart: uart@1f221000 {
+			compatible = "ns16550a";
+			reg = <0x1f221000 0x100>;
+			reg-shift = <3>;
+			clock-frequency = <172000000>;
+			status = "disabled";
+		};
+	};
+};
diff --git a/arch/arm/boot/dts/msc313e.dtsi b/arch/arm/boot/dts/msc313e.dtsi
new file mode 100644
index 000000000000..c4842625f6e2
--- /dev/null
+++ b/arch/arm/boot/dts/msc313e.dtsi
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 thingy.jp.
+ * Author: Daniel Palmer <daniel@thingy.jp>
+ */
+
+#include "msc313.dtsi"
+
+/ {
+	memory {
+		device_type = "memory";
+		reg = <0x20000000 0x4000000>;
+	};
+};
-- 
2.23.0


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[RFC 4/4] ARM: mstar: Add dts for msc313e based BreadBee board

[Daniel Palmer]

BreadBee is an opensource development board based on the
MStar msc313e SoC.

Hardware details, schematics and so on can be found at:
https://github.com/breadbee/breadbee
---
 MAINTAINERS                            |  1 +
 arch/arm/boot/dts/Makefile             |  1 +
 arch/arm/boot/dts/msc313e-breadbee.dts | 26 ++++++++++++++++++++++++++
 3 files changed, 28 insertions(+)
 create mode 100644 arch/arm/boot/dts/msc313e-breadbee.dts

diff --git a/MAINTAINERS b/MAINTAINERS
index c71c3ec3d43f..2768d6e07afb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1961,6 +1961,7 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 F:	Documentation/devicetree/bindings/arm/mstar.yaml
 F:	arch/arm/mach-mstar/
 F:	arch/arm/boot/dts/msc313*.dtsi
+F:	arch/arm/boot/dts/msc313e-*.dts
 S:	Maintained
 
 ARM/NEC MOBILEPRO 900/c MACHINE SUPPORT
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 9159fa2cea90..b4b5f639859a 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -1265,6 +1265,7 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
 	mt8127-moose.dtb \
 	mt8135-evbp1.dtb
 dtb-$(CONFIG_ARCH_MILBEAUT) += milbeaut-m10v-evb.dtb
+dtb-$(CONFIG_ARCH_MSTAR) += msc313e-breadbee.dtb
 dtb-$(CONFIG_ARCH_ZX) += zx296702-ad1.dtb
 dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-ast2500-evb.dtb \
diff --git a/arch/arm/boot/dts/msc313e-breadbee.dts b/arch/arm/boot/dts/msc313e-breadbee.dts
new file mode 100644
index 000000000000..470ea5fd94a7
--- /dev/null
+++ b/arch/arm/boot/dts/msc313e-breadbee.dts
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 thingy.jp.
+ * Author: Daniel Palmer <daniel@thingy.jp>
+ */
+
+/dts-v1/;
+#include "msc313e.dtsi"
+
+/ {
+	model = "thingy.jp breadbee";
+	compatible = "thingyjp,breadbee", "mstar,msc313e", "mstar,msc313";
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+		bootargs = "console=ttyS0,115200";
+	};
+
+	aliases {
+		console = &pm_uart;
+	};
+};
+
+&pm_uart {
+	status = "okay";
+};
-- 
2.23.0


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