net: dsa: b53: Add support for Broadcom RoboSwitch

This patch adds support for Broadcom's BCM53xx switch family, also known
as RoboSwitch. Some of these switches are ubiquituous, found in home
routers, Wi-Fi routers, DSL and cable modem gateways and other
networking related products.

This drivers adds the library driver (b53_common.c) as well as a few bus
glue drivers for MDIO, SPI, Switch Register Access Block (SRAB) and
memory-mapped I/O into a SoC's address space (Broadcom BCM63xx/33xx).

Basic operations are supported to bring the Layer 1/2 up and running,
but not much more at this point, subsequent patches add the remaining
features.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/dsa/b53.txt

@@ -0,0 +1,88 @@
+Broadcom BCM53xx Ethernet switches
+==================================
+
+Required properties:
+
+- compatible: For external switch chips, compatible string must be exactly one
+  of: "brcm,bcm5325"
+      "brcm,bcm53115"
+      "brcm,bcm53125"
+      "brcm,bcm53128"
+      "brcm,bcm5365"
+      "brcm,bcm5395"
+      "brcm,bcm5397"
+      "brcm,bcm5398"
+
+  For the BCM5310x SoCs with an integrated switch, must be one of:
+      "brcm,bcm53010-srab"
+      "brcm,bcm53011-srab"
+      "brcm,bcm53012-srab"
+      "brcm,bcm53018-srab"
+      "brcm,bcm53019-srab" and the mandatory "brcm,bcm5301x-srab" string
+
+  For the BCM63xx/33xx SoCs with an integrated switch, must be one of:
+      "brcm,bcm3384-switch"
+      "brcm,bcm6328-switch"
+      "brcm,bcm6368-switch" and the mandatory "brcm,bcm63xx-switch"
+
+See Documentation/devicetree/bindings/dsa/dsa.txt for a list of additional
+required and optional properties.
+
+Examples:
+
+Ethernet switch connected via MDIO to the host, CPU port wired to eth0:
+
+	eth0: ethernet@10001000 {
+		compatible = "brcm,unimac";
+		reg = <0x10001000 0x1000>;
+
+		fixed-link {
+			speed = <1000>;
+			duplex-full;
+		};
+	};
+
+	mdio0: mdio@10000000 {
+		compatible = "brcm,unimac-mdio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		switch0: ethernet-switch@30 {
+			compatible = "brcm,bcm53125";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			ports {
+				port0@0 {
+					reg = <0>;
+					label = "lan1";
+				};
+
+				port1@1 {
+					reg = <1>;
+					label = "lan2";
+				};
+
+				port5@5 {
+					reg = <5>;
+					label = "cable-modem";
+					fixed-link {
+						speed = <1000>;
+						duplex-full;
+					};
+					phy-mode = "rgmii-txid";
+				};
+
+				port8@8 {
+					reg = <8>;
+					label = "cpu";
+					fixed-link {
+						speed = <1000>;
+						duplex-full;
+					};
+					phy-mode = "rgmii-txid";
+					ethernet = <&eth0>;
+				};
+			};
+		};
+	};

MAINTAINERS

@@ -2454,6 +2454,14 @@ L:	netdev@vger.kernel.org
 S:	Supported
 F:	drivers/net/ethernet/broadcom/b44.*
 
+BROADCOM B53 ETHERNET SWITCH DRIVER
+M:	Florian Fainelli <f.fainelli@gmail.com>
+L:	netdev@vger.kernel.org
+L:	openwrt-devel@lists.openwrt.org (subscribers-only)
+S:	Supported
+F:	drivers/net/dsa/b53/*
+F:	include/linux/platform_data/b53.h
+
 BROADCOM GENET ETHERNET DRIVER
 M:	Florian Fainelli <f.fainelli@gmail.com>
 L:	netdev@vger.kernel.org

drivers/net/dsa/Kconfig

@@ -28,4 +28,6 @@ config NET_DSA_BCM_SF2
 	  This enables support for the Broadcom Starfighter 2 Ethernet
 	  switch chips.
 
+source "drivers/net/dsa/b53/Kconfig"
+
 endmenu

drivers/net/dsa/Makefile

@@ -1,3 +1,5 @@
 obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o
 obj-$(CONFIG_NET_DSA_MV88E6XXX) += mv88e6xxx.o
 obj-$(CONFIG_NET_DSA_BCM_SF2)	+= bcm_sf2.o
+
+obj-y				+= b53/

drivers/net/dsa/b53/Kconfig

@@ -0,0 +1,33 @@
+menuconfig B53
+	tristate "Broadcom BCM53xx managed switch support"
+	depends on NET_DSA
+	help
+	  This driver adds support for Broadcom managed switch chips. It supports
+	  BCM5325E, BCM5365, BCM539x, BCM53115 and BCM53125 as well as BCM63XX
+	  integrated switches.
+
+config B53_SPI_DRIVER
+	tristate "B53 SPI connected switch driver"
+	depends on B53 && SPI
+	help
+	  Select to enable support for registering switches configured through SPI.
+
+config B53_MDIO_DRIVER
+	tristate "B53 MDIO connected switch driver"
+	depends on B53
+	help
+	  Select to enable support for registering switches configured through MDIO.
+
+config B53_MMAP_DRIVER
+	tristate "B53 MMAP connected switch driver"
+	depends on B53 && HAS_IOMEM
+	help
+	  Select to enable support for memory-mapped switches like the BCM63XX
+	  integrated switches.
+
+config B53_SRAB_DRIVER
+	tristate "B53 SRAB connected switch driver"
+	depends on B53 && HAS_IOMEM
+	help
+	  Select to enable support for memory-mapped Switch Register Access
+	  Bridge Registers (SRAB) like it is found on the BCM53010

drivers/net/dsa/b53/Makefile

@@ -0,0 +1,6 @@
+obj-$(CONFIG_B53)		+= b53_common.o
+
+obj-$(CONFIG_B53_SPI_DRIVER)	+= b53_spi.o
+obj-$(CONFIG_B53_MDIO_DRIVER)	+= b53_mdio.o
+obj-$(CONFIG_B53_MMAP_DRIVER)	+= b53_mmap.o
+obj-$(CONFIG_B53_SRAB_DRIVER)	+= b53_srab.o