net: ps2: PlayStation 2 SMAP Ethernet driver

arch/mips/configs/ps2_defconfig

@@ -932,6 +932,7 @@ CONFIG_NET_VENDOR_MELLANOX=y
 # CONFIG_NET_VENDOR_NI is not set
 # CONFIG_ETHOC is not set
 # CONFIG_NET_VENDOR_PENSANDO is not set
+CONFIG_PS2_SMAP=m
 # CONFIG_NET_VENDOR_QUALCOMM is not set
 # CONFIG_NET_VENDOR_RENESAS is not set
 # CONFIG_NET_VENDOR_ROCKER is not set

arch/mips/ps2/devices.c

@@ -73,6 +73,61 @@ static struct platform_device pata_device = {
 	.resource	= pata_resources,
 };
 
+/*
+ * The SMAP part of the SPEED chip in the expansion bay.  The chip window
+ * starts at physical 0x14000000 and holds the ATA registers as well, at
+ * IOP_PATA_BASE, so SMAP is described as the two ranges it actually uses
+ * rather than as one block: the revision and interrupt registers below the
+ * ATA window, and everything from the buffer descriptor mode register up,
+ * which covers both FIFO data ports, the EMAC3 registers and the two
+ * descriptor rings.  Declaring the whole window instead would collide with
+ * the ATA device above and leave SMAP unregistered.
+ *
+ * The hardware only answers once iop-dev9 has powered the expansion bay,
+ * which the driver verifies through the IOP before it touches the window.
+ */
+#define SPEED_BASE	0x14000000
+
+static struct resource smap_resources[] = {
+	[0] = {
+		.name	= "speed",
+		.start	= SPEED_BASE,
+		.end	= SPEED_BASE + 0x3f,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.name	= "smap",
+		.start	= SPEED_BASE + 0x100,
+		.end	= SPEED_BASE + 0x3fff,
+		.flags	= IORESOURCE_MEM,
+	},
+	[2] = {
+		.name	= "rx",
+		.start	= IRQ_IOP_SPD_RXEND,
+		.end	= IRQ_IOP_SPD_RXEND,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[3] = {
+		.name	= "tx",
+		.start	= IRQ_IOP_SPD_TXEND,
+		.end	= IRQ_IOP_SPD_TXEND,
+		.flags	= IORESOURCE_IRQ,
+	},
+	[4] = {
+		.name	= "emac3",
+		.start	= IRQ_IOP_SPD_EMAC3,
+		.end	= IRQ_IOP_SPD_EMAC3,
+		.flags	= IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device smap_device = {
+	.name		= "ps2-smap",
+	.id		= -1,
+	.num_resources	= ARRAY_SIZE(smap_resources),
+	.resource	= smap_resources,
+};
+
 static struct resource gs_resources[] = {
 	[0] = {
 		.name	= "Graphics Synthesizer",
@@ -113,6 +168,7 @@ static struct platform_device *ps2_platform_devices[] __initdata = {
 	&iop_device,
 	&ohci_device,
 	&pata_device,
+	&smap_device,
 	&gs_device,
 	&gs_drm_device,	/* FIXME */
 	&rtc_device,

drivers/net/ethernet/Kconfig

@@ -158,6 +158,7 @@ config ETHOC
 source "drivers/net/ethernet/packetengines/Kconfig"
 source "drivers/net/ethernet/pasemi/Kconfig"
 source "drivers/net/ethernet/pensando/Kconfig"
+source "drivers/net/ethernet/ps2/Kconfig"
 source "drivers/net/ethernet/qlogic/Kconfig"
 source "drivers/net/ethernet/qualcomm/Kconfig"
 source "drivers/net/ethernet/rdc/Kconfig"

drivers/net/ethernet/Makefile

@@ -96,3 +96,4 @@ obj-$(CONFIG_NET_VENDOR_XILINX) += xilinx/
 obj-$(CONFIG_NET_VENDOR_XIRCOM) += xircom/
 obj-$(CONFIG_NET_VENDOR_SYNOPSYS) += synopsys/
 obj-$(CONFIG_NET_VENDOR_PENSANDO) += pensando/
+obj-$(CONFIG_NET_VENDOR_PS2) += ps2/

drivers/net/ethernet/ps2/Kconfig

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PlayStation 2 network device configuration
+#
+
+config NET_VENDOR_PS2
+	bool "PlayStation 2 devices"
+	default y
+	depends on SONY_PS2
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all the
+	  questions about PlayStation 2 cards. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_PS2
+
+config PS2_SMAP
+	tristate "PlayStation 2 SMAP Ethernet"
+	depends on SONY_PS2
+	select PHYLIB
+	help
+	  Ethernet support for the SMAP part of the SPEED chip found in the
+	  PlayStation 2 expansion bay network adaptor and, on later models,
+	  soldered to the board. The chip combines an IBM EMAC3 MAC with a
+	  National DP83846 PHY and is reachable from the EE once the DEV9
+	  expansion bay is powered.
+
+	  Data is moved by programmed I/O; the IOP-side DMA of the original
+	  Sony driver is not implemented.
+
+	  To compile this driver as a module, choose M here. The module will
+	  be called ps2-smap.
+
+endif # NET_VENDOR_PS2

drivers/net/ethernet/ps2/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the PlayStation 2 network device drivers.
+#
+
+obj-$(CONFIG_PS2_SMAP) += ps2-smap.o