[PATCH 3/3 v2] ARC: nsim_hs38: Add support of Virtio NET & BLK

[Alexey Brodkin]

Given now nsim_hs38 configuration is usable on QEMU and in QEMU
we have Virtio working perfectly fine the next logical step
is to add support of supported & known to work net & bkl to this
config.

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
---

Changes v1 -> v2:

 * Instead of adding IRQ parent it might be much cleaner solution
   to just get rid of "interrupt" properties in Virtio nodes.
   Again that's all OK for now since we don't really sync Linux .dts
   and U-Boot's ones. It's not that it's super good though but
   that's what we have today :)

 arch/arc/Kconfig                  |  4 ++--
 arch/arc/dts/nsim.dts             | 24 ++++++++++++++++++++++++
 board/synopsys/{ => nsim}/Kconfig |  3 +++
 board/synopsys/nsim/MAINTAINERS   |  6 ++++++
 board/synopsys/nsim/Makefile      |  7 +++++++
 board/synopsys/nsim/nsim.c        | 26 ++++++++++++++++++++++++++
 configs/nsim_hs38_defconfig       |  9 +++++++++
 7 files changed, 77 insertions(+), 2 deletions(-)
 rename board/synopsys/{ => nsim}/Kconfig (74%)
 create mode 100644 board/synopsys/nsim/MAINTAINERS
 create mode 100644 board/synopsys/nsim/Makefile
 create mode 100644 board/synopsys/nsim/nsim.c

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 0cb97207db..545fc3e243 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -160,7 +160,7 @@ config TARGET_TB100
 	bool "Support tb100"
 
 config TARGET_NSIM
-	bool "Support standalone nSIM & Free nSIM"
+	bool "Support ARC simulation & prototyping platforms"
 
 config TARGET_AXS101
 	bool "Support Synopsys Designware SDP board AXS101"
@@ -184,10 +184,10 @@ config TARGET_IOT_DEVKIT
 endchoice
 
 source "board/abilis/tb100/Kconfig"
-source "board/synopsys/Kconfig"
 source "board/synopsys/axs10x/Kconfig"
 source "board/synopsys/emsdp/Kconfig"
 source "board/synopsys/hsdk/Kconfig"
 source "board/synopsys/iot_devkit/Kconfig"
+source "board/synopsys/nsim/Kconfig"
 
 endmenu
diff --git a/arch/arc/dts/nsim.dts b/arch/arc/dts/nsim.dts
index 43f281dfec..c2899ef2ea 100644
--- a/arch/arc/dts/nsim.dts
+++ b/arch/arc/dts/nsim.dts
@@ -30,4 +30,28 @@
 		clock-frequency = <70000000>;
 	};
 
+	virtio0: virtio at f0100000 {
+		compatible = "virtio,mmio";
+		reg = <0xf0100000 0x2000>;
+	};
+
+	virtio1: virtio at f0102000 {
+		compatible = "virtio,mmio";
+		reg = <0xf0102000 0x2000>;
+	};
+
+	virtio2: virtio at f0104000 {
+		compatible = "virtio,mmio";
+		reg = <0xf0104000 0x2000>;
+	};
+
+	virtio3: virtio at f0106000 {
+		compatible = "virtio,mmio";
+		reg = <0xf0106000 0x2000>;
+	};
+
+	virtio4: virtio at f0108000 {
+		compatible = "virtio,mmio";
+		reg = <0xf0108000 0x2000>;
+	};
 };
diff --git a/board/synopsys/Kconfig b/board/synopsys/nsim/Kconfig
similarity index 74%
rename from board/synopsys/Kconfig
rename to board/synopsys/nsim/Kconfig
index 27e5509b26..22287032bf 100644
--- a/board/synopsys/Kconfig
+++ b/board/synopsys/nsim/Kconfig
@@ -1,5 +1,8 @@
 if TARGET_NSIM
 
+config SYS_BOARD
+	default "nsim"
+
 config SYS_VENDOR
 	default "synopsys"
 
diff --git a/board/synopsys/nsim/MAINTAINERS b/board/synopsys/nsim/MAINTAINERS
new file mode 100644
index 0000000000..ad23c8338e
--- /dev/null
+++ b/board/synopsys/nsim/MAINTAINERS
@@ -0,0 +1,6 @@
+ARC SIMULATION & PROTOTYPING PLATFORMS
+M:	Alexey Brodkin <abrodkin at synopsys.com>
+S:	Maintained
+F:	arch/arc/dts/nsim.dts
+F:	board/synopsys/nsim/
+F:	configs/nsim_*_defconfig
diff --git a/board/synopsys/nsim/Makefile b/board/synopsys/nsim/Makefile
new file mode 100644
index 0000000000..6aaffffa73
--- /dev/null
+++ b/board/synopsys/nsim/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2020 Synopsys, Inc. All rights reserved.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= nsim.o
diff --git a/board/synopsys/nsim/nsim.c b/board/synopsys/nsim/nsim.c
new file mode 100644
index 0000000000..f384f707f6
--- /dev/null
+++ b/board/synopsys/nsim/nsim.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Synopsys, Inc. All rights reserved.
+ */
+
+#include <common.h>
+#include <dm/device.h>
+#include <virtio_types.h>
+#include <virtio.h>
+
+int board_early_init_r(void)
+{
+	/*
+	 * Make sure virtio bus is enumerated so that peripherals
+	 * on the virtio bus can be discovered by their drivers
+	 */
+	virtio_init();
+
+	return 0;
+}
+
+int checkboard(void)
+{
+	printf("Board: ARC virtual or prototyping platform\n");
+	return 0;
+};
diff --git a/configs/nsim_hs38_defconfig b/configs/nsim_hs38_defconfig
index ce68de3251..6cd01a505b 100644
--- a/configs/nsim_hs38_defconfig
+++ b/configs/nsim_hs38_defconfig
@@ -9,14 +9,23 @@ CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyS0,115200n8"
+CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_SYS_PROMPT="nsim# "
+CONFIG_CMD_DM=y
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
+CONFIG_BLK=y
+CONFIG_HAVE_BLOCK_DEVICE=y
+CONFIG_DM_ETH=y
 CONFIG_DM_SERIAL=y
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_SYS_NS16550=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_NET=y
+CONFIG_VIRTIO_BLK=y
 CONFIG_USE_PRIVATE_LIBGCC=y
-- 
2.16.2