arm-soc: Add support for Sigma Designs Tango4 platforms

PATCH Superseded Marc Gonzalez 1 participant 5 messages Oct 19, 2015 – Oct 27, 2015

Subsystems (4)

Device tree bindings Arm (32-bit) Arm sub-architectures Arm and arm64 SoC sub-architectures (common parts)

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Marc Gonzalez

author

2015-10-19 15:43 UTC #0 lore raw

PATCH v4 1/1 arm-soc: Add support for Sigma Designs Tango4 platforms

Support Tango4 platforms (single and dual core SoCs) built around the ARM Cortex-A9 MPCore.

Tango4 is not to be confused with Tango3, which was built around the MIPS 74kf.

Signed-off-by Marc Gonzalez <[email protected]>

---
Changes in v4
add memory node, cpus node, l2cc node rewrite clkgen node, as requested by clk maintainers not sure about pmu node

---
 arch/arm/Kconfig                          |   2 +
 arch/arm/Makefile                         |   1 +
 arch/arm/boot/dts/Makefile                |   2 +
 arch/arm/boot/dts/tango4-vantage-1172.dts |  18 ++++
 arch/arm/boot/dts/tango4.dtsi             | 134 ++++++++++++++++++++++++++++++
 arch/arm/mach-tangox/Kconfig              |  12 +++
 arch/arm/mach-tangox/Makefile             |   1 +
 arch/arm/mach-tangox/setup.c              |   7 ++
 8 files changed, 177 insertions(+)
 create mode 100644 arch/arm/boot/dts/tango4-vantage-1172.dts
 create mode 100644 arch/arm/boot/dts/tango4.dtsi
 create mode 100644 arch/arm/mach-tangox/Kconfig
 create mode 100644 arch/arm/mach-tangox/Makefile
 create mode 100644 arch/arm/mach-tangox/setup.c

arch/arm/Kconfig +2 -0

index 774dc59650c5..d8f0c31f521f 100644
@@ -934,6 +934,8 @@ source "arch/arm/mach-sunxi/Kconfig"
 
 source "arch/arm/mach-prima2/Kconfig"
 
+source "arch/arm/mach-tangox/Kconfig"
+
 source "arch/arm/mach-tegra/Kconfig"
 
 source "arch/arm/mach-u300/Kconfig"

arch/arm/Makefile +1 -0

index 7451b447cc2d..7fcb4c63cdf7 100644
@@ -203,6 +203,7 @@ machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_STI)		+= sti
 machine-$(CONFIG_ARCH_STM32)		+= stm32
 machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
+machine-$(CONFIG_ARCH_TANGOX)		+= tangox
 machine-$(CONFIG_ARCH_TEGRA)		+= tegra
 machine-$(CONFIG_ARCH_U300)		+= u300
 machine-$(CONFIG_ARCH_U8500)		+= ux500

arch/arm/boot/dts/Makefile +2 -0

index 246473a244f6..2499295051d5 100644
@@ -605,6 +605,8 @@ dtb-$(CONFIG_MACH_SUN8I) += \
 dtb-$(CONFIG_MACH_SUN9I) += \
 	sun9i-a80-optimus.dtb \
 	sun9i-a80-cubieboard4.dtb
+dtb-$(CONFIG_ARCH_TANGOX) += \
+	tango4-vantage-1172.dtb
 dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 	tegra20-harmony.dtb \
 	tegra20-iris-512.dtb \

arch/arm/boot/dts/tango4-vantage-1172.dts new file +18 -0

new file mode 100644
index 000000000000..00c9d7e69f80
@@ -0,0 +1,18 @@
+/dts-v1/;
+
+#include "tango4.dtsi"
+
+/ {
+	model = "Sigma Designs SMP8758 Vantage-1172 dev board";
+	compatible = "sigma,vantage-1172", "sigma,smp8758", "sigma,tango4";
+
+	memory at 80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x80000000>; /* 2 GB */
+	};
+};
+
+&eth0 {
+	phy-connection-type = "rgmii";
+	max-speed = <1000>;
+};

arch/arm/boot/dts/tango4.dtsi new file +134 -0

134 lines not on this page · raw message

arch/arm/mach-tangox/Kconfig new file +12 -0

new file mode 100644
index 000000000000..4d04952ed00f
@@ -0,0 +1,12 @@
+# Tango3 was based on MIPS 74kf. Tango4 is based on ARM Cortex-A9 MPCore.
+
+config ARCH_TANGOX
+	bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
+	select ARCH_HAS_HOLES_MEMORYMODEL
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_GIC
+	select CLKSRC_TANGO_XTAL
+	select GENERIC_IRQ_CHIP
+	select HAVE_ARM_SCU
+	select HAVE_ARM_TWD

arch/arm/mach-tangox/Makefile new file +1 -0

new file mode 100644
index 000000000000..2b9dba458932
@@ -0,0 +1 @@
+obj-y += setup.o

arch/arm/mach-tangox/setup.c new file +7 -0

new file mode 100644
index 000000000000..46ae91e49f81
@@ -0,0 +1,7 @@
+#include <asm/mach/arch.h>
+
+static const char *tango_dt_compat[] = { "sigma,tango4", NULL };
+
+DT_MACHINE_START(TANGO_DT, "Sigma Tango DT")
+	.dt_compat	= tango_dt_compat,
+MACHINE_END

Signature · 1 line

2.4.5

Marc Gonzalez

author

2015-10-20 16:35 UTC #1 lore raw

PATCH v5 1/1 arm-soc: Add support for Sigma Designs Tango4 platforms

Support Tango4 platforms (single and dual core SoCs) built around the ARM Cortex-A9 MPCore.

Tango4 is not to be confused with Tango3, which was built around the MIPS 74kf.

Signed-off-by Marc Gonzalez <[email protected]>

---
Changes in v5
drop mac-address property from eth0 node
tentatively add pmu node (not looking good)
hw perfevents: failed to probe PMU!
hw perfevents: failed to register PMU devices!

Changes in v4
add memory node, cpus node, l2cc node rewrite clkgen node, as requested by clk maintainers not sure about pmu node

---
 arch/arm/Kconfig                          |   2 +
 arch/arm/Makefile                         |   1 +
 arch/arm/boot/dts/Makefile                |   2 +
 arch/arm/boot/dts/tango4-vantage-1172.dts |  18 ++++
 arch/arm/boot/dts/tango4.dtsi             | 140 ++++++++++++++++++++++++++++++
 arch/arm/mach-tangox/Kconfig              |  12 +++
 arch/arm/mach-tangox/Makefile             |   1 +
 arch/arm/mach-tangox/setup.c              |   7 ++
 8 files changed, 183 insertions(+)
 create mode 100644 arch/arm/boot/dts/tango4-vantage-1172.dts
 create mode 100644 arch/arm/boot/dts/tango4.dtsi
 create mode 100644 arch/arm/mach-tangox/Kconfig
 create mode 100644 arch/arm/mach-tangox/Makefile
 create mode 100644 arch/arm/mach-tangox/setup.c

arch/arm/Kconfig +2 -0

index 774dc59650c5..d8f0c31f521f 100644
@@ -934,6 +934,8 @@ source "arch/arm/mach-sunxi/Kconfig"
 
 source "arch/arm/mach-prima2/Kconfig"
 
+source "arch/arm/mach-tangox/Kconfig"
+
 source "arch/arm/mach-tegra/Kconfig"
 
 source "arch/arm/mach-u300/Kconfig"

arch/arm/Makefile +1 -0

index 7451b447cc2d..7fcb4c63cdf7 100644
@@ -203,6 +203,7 @@ machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_STI)		+= sti
 machine-$(CONFIG_ARCH_STM32)		+= stm32
 machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
+machine-$(CONFIG_ARCH_TANGOX)		+= tangox
 machine-$(CONFIG_ARCH_TEGRA)		+= tegra
 machine-$(CONFIG_ARCH_U300)		+= u300
 machine-$(CONFIG_ARCH_U8500)		+= ux500

arch/arm/boot/dts/Makefile +2 -0

index 246473a244f6..2499295051d5 100644
@@ -605,6 +605,8 @@ dtb-$(CONFIG_MACH_SUN8I) += \
 dtb-$(CONFIG_MACH_SUN9I) += \
 	sun9i-a80-optimus.dtb \
 	sun9i-a80-cubieboard4.dtb
+dtb-$(CONFIG_ARCH_TANGOX) += \
+	tango4-vantage-1172.dtb
 dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 	tegra20-harmony.dtb \
 	tegra20-iris-512.dtb \

arch/arm/boot/dts/tango4-vantage-1172.dts new file +18 -0

new file mode 100644
index 000000000000..00c9d7e69f80
@@ -0,0 +1,18 @@
+/dts-v1/;
+
+#include "tango4.dtsi"
+
+/ {
+	model = "Sigma Designs SMP8758 Vantage-1172 dev board";
+	compatible = "sigma,vantage-1172", "sigma,smp8758", "sigma,tango4";
+
+	memory at 80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x80000000>; /* 2 GB */
+	};
+};
+
+&eth0 {
+	phy-connection-type = "rgmii";
+	max-speed = <1000>;
+};

arch/arm/boot/dts/tango4.dtsi new file +140 -0

140 lines not on this page · raw message

arch/arm/mach-tangox/Kconfig new file +12 -0

new file mode 100644
index 000000000000..4d04952ed00f
@@ -0,0 +1,12 @@
+# Tango3 was based on MIPS 74kf. Tango4 is based on ARM Cortex-A9 MPCore.
+
+config ARCH_TANGOX
+	bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
+	select ARCH_HAS_HOLES_MEMORYMODEL
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_GIC
+	select CLKSRC_TANGO_XTAL
+	select GENERIC_IRQ_CHIP
+	select HAVE_ARM_SCU
+	select HAVE_ARM_TWD

arch/arm/mach-tangox/Makefile new file +1 -0

new file mode 100644
index 000000000000..2b9dba458932
@@ -0,0 +1 @@
+obj-y += setup.o

arch/arm/mach-tangox/setup.c new file +7 -0

new file mode 100644
index 000000000000..46ae91e49f81
@@ -0,0 +1,7 @@
+#include <asm/mach/arch.h>
+
+static const char *tango_dt_compat[] = { "sigma,tango4", NULL };
+
+DT_MACHINE_START(TANGO_DT, "Sigma Tango DT")
+	.dt_compat	= tango_dt_compat,
+MACHINE_END

Signature · 1 line

2.4.5

Marc Gonzalez

author

2015-10-21 09:59 UTC #2 lore raw

PATCH v5 1/1 arm-soc: Add support for Sigma Designs Tango4 platforms

Quoted 5 lines · Marc Gonzalez

Changes in v5
drop mac-address property from eth0 node tentatively add pmu node (not looking good) hw perfevents: failed to probe PMU!
hw perfevents: failed to register PMU devices!

armv7_a9_pmu_init() eventually calls generic_exec_single() which fails this test:

	if ((unsigned)cpu >= nr_cpu_ids || !cpu_online(cpu))

because cpu = 4 and nr_cpu_ids = 2

  /* Any online will do: smp_call_function_single handles nr_cpu_ids. */
  cpu = cpumask_any_and(mask, cpu_online_mask);

nr_cpu_ids starts out as 4 (CONFIG_NR_CPUS=4) but setup_nr_cpu_ids() drops it to 2 (the actual number of cores).

<confused> I thought NR_CPUS was just the maximum number of CPUs. Is it expected that armv7_a9_pmu_init() would fail as it does for me?

Regards.

Marc Gonzalez

author

2015-10-23 16:03 UTC #3 lore raw

PATCH v6 1/1 arm-soc: Add support for Sigma Designs Tango4 platforms

In reply to Marc Gonzalez

Support Tango4 platforms (single and dual core SoCs) built around the ARM Cortex-A9 MPCore. (Tango4 is not to be confused with Tango3, which was built around the MIPS 74kf.)

Signed-off-by Marc Gonzalez <[email protected]>

---
Changes in v6
Move cpus and pmu nodes to SoC-specific dtsi
Add more compatible strings for eth and intc
Credit Mans for the initial DT

Changes in v5
drop mac-address property from eth0 node
tentatively add pmu node (not looking good)

Changes in v4
add memory node, cpus node, l2cc node rewrite clkgen node, as requested by clk maintainers

---
 arch/arm/Kconfig                          |   2 +
 arch/arm/Makefile                         |   1 +
 arch/arm/boot/dts/Makefile                |   2 +
 arch/arm/boot/dts/tango4-common.dtsi      | 121 ++++++++++++++++++++++++++++++
 arch/arm/boot/dts/tango4-smp8758.dtsi     |  31 ++++++++
 arch/arm/boot/dts/tango4-vantage-1172.dts |  19 +++++
 arch/arm/mach-tangox/Kconfig              |  12 +++
 arch/arm/mach-tangox/Makefile             |   1 +
 arch/arm/mach-tangox/setup.c              |   7 ++
 9 files changed, 196 insertions(+)
 create mode 100644 arch/arm/boot/dts/tango4-common.dtsi
 create mode 100644 arch/arm/boot/dts/tango4-smp8758.dtsi
 create mode 100644 arch/arm/boot/dts/tango4-vantage-1172.dts
 create mode 100644 arch/arm/mach-tangox/Kconfig
 create mode 100644 arch/arm/mach-tangox/Makefile
 create mode 100644 arch/arm/mach-tangox/setup.c

arch/arm/Kconfig +2 -0

index 1c5021002fe4..94a1a0277c94 100644
@@ -934,6 +934,8 @@ source "arch/arm/mach-sunxi/Kconfig"
 
 source "arch/arm/mach-prima2/Kconfig"
 
+source "arch/arm/mach-tangox/Kconfig"
+
 source "arch/arm/mach-tegra/Kconfig"
 
 source "arch/arm/mach-u300/Kconfig"

arch/arm/Makefile +1 -0

index 7451b447cc2d..7fcb4c63cdf7 100644
@@ -203,6 +203,7 @@ machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_STI)		+= sti
 machine-$(CONFIG_ARCH_STM32)		+= stm32
 machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
+machine-$(CONFIG_ARCH_TANGOX)		+= tangox
 machine-$(CONFIG_ARCH_TEGRA)		+= tegra
 machine-$(CONFIG_ARCH_U300)		+= u300
 machine-$(CONFIG_ARCH_U8500)		+= ux500

arch/arm/boot/dts/Makefile +2 -0

index 246473a244f6..2499295051d5 100644
@@ -605,6 +605,8 @@ dtb-$(CONFIG_MACH_SUN8I) += \
 dtb-$(CONFIG_MACH_SUN9I) += \
 	sun9i-a80-optimus.dtb \
 	sun9i-a80-cubieboard4.dtb
+dtb-$(CONFIG_ARCH_TANGOX) += \
+	tango4-vantage-1172.dtb
 dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 	tegra20-harmony.dtb \
 	tegra20-iris-512.dtb \

arch/arm/boot/dts/tango4-common.dtsi new file +121 -0

121 lines not on this page · raw message

arch/arm/boot/dts/tango4-smp8758.dtsi new file +31 -0

new file mode 100644
index 000000000000..94c3e05f7d4c
@@ -0,0 +1,31 @@
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu at 0 {
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&l2cc>;
+			device_type = "cpu";
+			reg = <0>;
+		};
+
+		cpu1: cpu at 1 {
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&l2cc>;
+			device_type = "cpu";
+			reg = <1>;
+		};
+	};
+
+	pmu {
+		compatible = "arm,cortex-a9-pmu";
+		interrupt-affinity = <&cpu0>, <&cpu1>;
+		interrupt-parent = <&gic>;
+		interrupts =
+			<GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+	};
+};

arch/arm/boot/dts/tango4-vantage-1172.dts new file +19 -0

new file mode 100644
index 000000000000..c3f98e85e334
@@ -0,0 +1,19 @@
+/dts-v1/;
+
+#include "tango4-smp8758.dtsi"
+#include "tango4-common.dtsi"
+
+/ {
+	model = "Sigma Designs SMP8758 Vantage-1172 dev board";
+	compatible = "sigma,vantage-1172", "sigma,smp8758", "sigma,tango4";
+
+	memory at 80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x80000000>; /* 2 GB */
+	};
+};
+
+&eth0 {
+	phy-connection-type = "rgmii";
+	max-speed = <1000>;
+};

arch/arm/mach-tangox/Kconfig new file +12 -0

new file mode 100644
index 000000000000..4d04952ed00f
@@ -0,0 +1,12 @@
+# Tango3 was based on MIPS 74kf. Tango4 is based on ARM Cortex-A9 MPCore.
+
+config ARCH_TANGOX
+	bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
+	select ARCH_HAS_HOLES_MEMORYMODEL
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_GIC
+	select CLKSRC_TANGO_XTAL
+	select GENERIC_IRQ_CHIP
+	select HAVE_ARM_SCU
+	select HAVE_ARM_TWD

arch/arm/mach-tangox/Makefile new file +1 -0

new file mode 100644
index 000000000000..2b9dba458932
@@ -0,0 +1 @@
+obj-y += setup.o

arch/arm/mach-tangox/setup.c new file +7 -0

new file mode 100644
index 000000000000..46ae91e49f81
@@ -0,0 +1,7 @@
+#include <asm/mach/arch.h>
+
+static const char *tango_dt_compat[] = { "sigma,tango4", NULL };
+
+DT_MACHINE_START(TANGO_DT, "Sigma Tango DT")
+	.dt_compat	= tango_dt_compat,
+MACHINE_END

Signature · 1 line

2.4.5

Marc Gonzalez

author

2015-10-27 17:12 UTC #4 lore raw

PATCH v6 1/1 arm-soc: Add support for Sigma Designs Tango4 platforms

I've made some additional changes, which I'm not 100% sure about. I suppose this should be considered a RFC.

Changes in v7
Toggle L2 cache via smc
Move peripheral devices compatible strings to board DTS
(because it contains the chip number, while common is generic)
Add UART IRQ

Patch follows.

Regards.

arch/arm/Kconfig +2 -0

index 1c5021002fe4..d8f0c31f521f 100644
@@ -934,6 +934,8 @@ source "arch/arm/mach-sunxi/Kconfig"
 
 source "arch/arm/mach-prima2/Kconfig"
 
+source "arch/arm/mach-tangox/Kconfig"
+
 source "arch/arm/mach-tegra/Kconfig"
 
 source "arch/arm/mach-u300/Kconfig"

arch/arm/Makefile +1 -0

index 7451b447cc2d..7fcb4c63cdf7 100644
@@ -203,6 +203,7 @@ machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_STI)		+= sti
 machine-$(CONFIG_ARCH_STM32)		+= stm32
 machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
+machine-$(CONFIG_ARCH_TANGOX)		+= tangox
 machine-$(CONFIG_ARCH_TEGRA)		+= tegra
 machine-$(CONFIG_ARCH_U300)		+= u300
 machine-$(CONFIG_ARCH_U8500)		+= ux500

arch/arm/boot/dts/Makefile +2 -0

index 246473a244f6..2499295051d5 100644
@@ -605,6 +605,8 @@ dtb-$(CONFIG_MACH_SUN8I) += \
 dtb-$(CONFIG_MACH_SUN9I) += \
 	sun9i-a80-optimus.dtb \
 	sun9i-a80-cubieboard4.dtb
+dtb-$(CONFIG_ARCH_TANGOX) += \
+	tango4-vantage-1172.dtb
 dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
 	tegra20-harmony.dtb \
 	tegra20-iris-512.dtb \

arch/arm/boot/dts/tango4-common.dtsi new file +121 -0

121 lines not on this page · raw message

arch/arm/boot/dts/tango4-smp8758.dtsi new file +31 -0

new file mode 100644
index 000000000000..94c3e05f7d4c
@@ -0,0 +1,31 @@
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu at 0 {
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&l2cc>;
+			device_type = "cpu";
+			reg = <0>;
+		};
+
+		cpu1: cpu at 1 {
+			compatible = "arm,cortex-a9";
+			next-level-cache = <&l2cc>;
+			device_type = "cpu";
+			reg = <1>;
+		};
+	};
+
+	pmu {
+		compatible = "arm,cortex-a9-pmu";
+		interrupt-affinity = <&cpu0>, <&cpu1>;
+		interrupt-parent = <&gic>;
+		interrupts =
+			<GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
+			<GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
+	};
+};

arch/arm/boot/dts/tango4-vantage-1172.dts new file +24 -0

new file mode 100644
index 000000000000..772f27c360ed
@@ -0,0 +1,24 @@
+/dts-v1/;
+
+#include "tango4-smp8758.dtsi"
+#include "tango4-common.dtsi"
+
+/ {
+	model = "Sigma Designs SMP8758 Vantage-1172 dev board";
+	compatible = "sigma,vantage-1172", "sigma,smp8758", "sigma,tango4";
+
+	memory at 80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x80000000>; /* 2 GB */
+	};
+};
+
+&eth0 {
+	compatible = "sigma,smp8758-ethernet", "sigma,smp8910-ethernet", "sigma,smp8642-ethernet", "aurora,nb8800";
+	phy-connection-type = "rgmii";
+	max-speed = <1000>;
+};
+
+&intc {
+	compatible = "sigma,smp8758-intc", "sigma,smp8642-intc";
+};

arch/arm/mach-tangox/Kconfig new file +10 -0

new file mode 100644
index 000000000000..2432a51f8b43
@@ -0,0 +1,10 @@
+config ARCH_TANGOX
+	bool "Sigma Designs Tango4 (SMP87xx)" if ARCH_MULTI_V7
+	select ARCH_HAS_HOLES_MEMORYMODEL
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_GIC
+	select CLKSRC_TANGO_XTAL
+	select GENERIC_IRQ_CHIP
+	select HAVE_ARM_SCU
+	select HAVE_ARM_TWD

arch/arm/mach-tangox/Makefile new file +2 -0

new file mode 100644
index 000000000000..0d7e2b5976e3
@@ -0,0 +1,2 @@
+asflags-y += -mcpu=cortex-a9
+obj-y += setup.o smc.o

arch/arm/mach-tangox/setup.c new file +18 -0

new file mode 100644
index 000000000000..044eb974172a
@@ -0,0 +1,18 @@
+#include <asm/mach/arch.h>
+#include <asm/hardware/cache-l2x0.h>
+
+static void tango_l2c_write(unsigned long val, unsigned int reg)
+{
+	void tango_set_l2_control(unsigned int val);
+	pr_info("%s: reg=0x%x val=0x%lx\n", __func__, reg, val);
+	if (reg == L2X0_CTRL)
+		tango_set_l2_control(val);
+}
+
+static const char *tango_dt_compat[] = { "sigma,tango4", NULL };
+
+DT_MACHINE_START(TANGO_DT, "Sigma Tango DT")
+	.dt_compat	= tango_dt_compat,
+	.l2c_aux_mask	= ~0,
+	.l2c_write_sec	= tango_l2c_write,
+MACHINE_END

arch/arm/mach-tangox/smc.S new file +14 -0

new file mode 100644
index 000000000000..1527d23cffc5
@@ -0,0 +1,14 @@
+#include <linux/linkage.h>
+
+#define SMC_SET_L2_CONTROL	0x102
+
+/*
+ * Have Armor write r0 to l2_control.
+ */
+ENTRY(tango_set_l2_control)
+	push	{lr}
+	movw	ip, #SMC_SET_L2_CONTROL
+	dsb
+	smc	#0
+	pop	{pc}
+ENDPROC(tango_set_l2_control)