Add UCB RISCV support for architecture, soc, and emulation mainboard..

Works in the RISCV version of QEMU.

Note that the lzmadecode is so unclean that it needs a lot of work.
A cleanup is in progress.

We decided in Prague to do this as one thing, because it forms a nice case study
of the bare minimum you need to add to get a new architecture going in qemu.

Change-Id: If5af15c3a70733d219973e0d032746f8ab027e4d
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/7584
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

9 files changed, 310 insertions, 0 deletions

diff --git a/src/mainboard/emulation/Kconfig b/src/mainboard/emulation/Kconfig
index 3fbc4159fe..a1ee02d54e 100644
--- a/src/mainboard/emulation/Kconfig
+++ b/src/mainboard/emulation/Kconfig
@@ -12,6 +12,9 @@ config BOARD_EMULATION_QEMU_X86_Q35
 config BOARD_EMULATION_QEMU_ARMV7
 	bool "QEMU armv7 (vexpress-a9)"
 
+config BOARD_EMULATION_QEMU_UCB_RISCV
+	bool "QEMU ucb riscv"
+
 endchoice
 
 config BOARD_EMULATION_QEMU_X86
@@ -22,6 +25,7 @@ config BOARD_EMULATION_QEMU_X86
 source "src/mainboard/emulation/qemu-i440fx/Kconfig"
 source "src/mainboard/emulation/qemu-q35/Kconfig"
 source "src/mainboard/emulation/qemu-armv7/Kconfig"
+source "src/mainboard/emulation/qemu-riscv/Kconfig"
 
 config MAINBOARD_VENDOR
 	string
diff --git a/src/mainboard/emulation/qemu-riscv/Kconfig b/src/mainboard/emulation/qemu-riscv/Kconfig
new file mode 100644
index 0000000000..d7d5cc984c
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/Kconfig
@@ -0,0 +1,97 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2014 Google Inc.
+##
+## This software is licensed under the terms of the GNU General Public
+## License version 2, as published by the Free Software Foundation, and
+## may be copied, distributed, and modified under those terms.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+# To execute, do:
+# qemu-system-arm -M vexpress-a9 -m 1024M -nographic -kernel build/coreboot.rom
+
+if BOARD_EMULATION_QEMU_UCB_RISCV
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select SOC_UCB_RISCV
+	select BOARD_ROMSIZE_KB_4096
+	select ARCH_BOOTBLOCK_RISCV
+	select HAVE_UART_SPECIAL
+
+config MAINBOARD_DIR
+	string
+	default emulation/qemu-riscv
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "QEMU RISCV"
+
+config MAX_CPUS
+	int
+	default 1
+
+config MAINBOARD_VENDOR
+	string
+	default "UCB"
+
+config DRAM_SIZE_MB
+	int
+	default 32768
+
+# Memory map for qemu riscv
+#
+# 0x0000_0000: jump instruction (by qemu)
+# 0x0002_0000: bootblock (entry of kernel / firmware)
+# 0x0003_0000: romstage, assume up to 128KB in size.
+# 0x0007_ff00: stack pointer
+# 0x0010_0000: CBFS header
+# 0x0011_0000: CBFS data
+# 0x0100_0000: reserved for ramstage
+
+config BOOTBLOCK_BASE
+	hex
+	default 0x00000000
+
+config ROMSTAGE_BASE
+	hex
+	default 0x00020000
+
+config RAMSTAGE_BASE
+	hex
+	default 0x100000
+
+config BOOTBLOCK_ROM_OFFSET
+	hex
+	default 0x0
+
+config CBFS_HEADER_ROM_OFFSET
+	hex
+	default 0x10000
+
+config CBFS_ROM_OFFSET
+	hex
+	default 0x10040
+
+config RAMTOP
+	hex
+	default 0x1000000
+
+config STACK_TOP
+	hex
+	default 0x0007ff00
+
+config STACK_BOTTOM
+	hex
+	default 0x00040000
+
+config STACK_SIZE
+	hex
+	default 0x0003ff00
+
+endif #  BOARD_EMULATION_QEMU_UCB_RISCV
diff --git a/src/mainboard/emulation/qemu-riscv/Makefile.inc b/src/mainboard/emulation/qemu-riscv/Makefile.inc
new file mode 100644
index 0000000000..bc01d2f6cf
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/Makefile.inc
@@ -0,0 +1,19 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2013 Google Inc.
+##
+## This software is licensed under the terms of the GNU General Public
+## License version 2, as published by the Free Software Foundation, and
+## may be copied, distributed, and modified under those terms.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+bootblock-y += bootblock.c
+bootblock-y += uart.c
+romstage-y += romstage.c
+romstage-y += uart.c
+ramstage-y += uart.c
diff --git a/src/mainboard/emulation/qemu-riscv/board_info.txt b/src/mainboard/emulation/qemu-riscv/board_info.txt
new file mode 100644
index 0000000000..811e8e0840
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/board_info.txt
@@ -0,0 +1,2 @@
+Board name: QEMU RISCV
+Category: emulation
diff --git a/src/mainboard/emulation/qemu-riscv/bootblock.c b/src/mainboard/emulation/qemu-riscv/bootblock.c
new file mode 100644
index 0000000000..831b193a6e
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/bootblock.c
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/exception.h>
+#include <arch/hlt.h>
+#include <bootblock_common.h>
+#include <cbfs.h>
+#include <console/console.h>
+#include <arch/stages.h>
+
+// the qemu part of all this is very, very non-hardware like.
+// so it gets its own bootblock.
+void main(void)
+{
+	void *entry;
+
+	if (IS_ENABLED(CONFIG_BOOTBLOCK_CONSOLE)) {
+		console_init();
+		exception_init();
+	}
+
+	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, CONFIG_CBFS_PREFIX"/romstage");
+	if (! entry) {
+		printk(BIOS_EMERG, "AAAAAAAAAAAAAA no romstage!\n");
+		while (1);
+	}
+
+	stage_exit(entry);
+}
diff --git a/src/mainboard/emulation/qemu-riscv/devicetree.cb b/src/mainboard/emulation/qemu-riscv/devicetree.cb
new file mode 100644
index 0000000000..e3ce08829e
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/devicetree.cb
@@ -0,0 +1,20 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2014 Google, Inc.
+##
+## This software is licensed under the terms of the GNU General Public
+## License version 2, as published by the Free Software Foundation, and
+## may be copied, distributed, and modified under those terms.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+chip soc/ucb/riscv
+	device cpu_cluster 0 on end
+	chip drivers/generic/generic # I2C0 controller
+		device i2c 6 on end # Fake component for testing
+	end
+end
diff --git a/src/mainboard/emulation/qemu-riscv/mainboard.c b/src/mainboard/emulation/qemu-riscv/mainboard.c
new file mode 100644
index 0000000000..111e9b185b
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/mainboard.c
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <cbmem.h>
+
+static void mainboard_enable(device_t dev)
+{
+
+	if (!dev) {
+		printk(BIOS_EMERG, "No dev0; die\n");
+		while (1);
+	}
+
+	ram_resource(dev, 0, 2048, 32768);
+	cbmem_recovery(0);
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};
diff --git a/src/mainboard/emulation/qemu-riscv/romstage.c b/src/mainboard/emulation/qemu-riscv/romstage.c
new file mode 100644
index 0000000000..f4b44f614c
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/romstage.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <cbfs.h>
+#include <console/console.h>
+#include <arch/stages.h>
+
+void main(void)
+{
+        void *entry;
+
+	console_init();
+
+	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, CONFIG_CBFS_PREFIX"/ramstage");
+
+	stage_exit(entry);
+}
diff --git a/src/mainboard/emulation/qemu-riscv/uart.c b/src/mainboard/emulation/qemu-riscv/uart.c
new file mode 100644
index 0000000000..40192c91fa
--- /dev/null
+++ b/src/mainboard/emulation/qemu-riscv/uart.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <types.h>
+#include <console/uart.h>
+#include <arch/io.h>
+#include <boot/coreboot_tables.h>
+#include "frontend.h"
+
+static uint8_t *buf = (void *)0x3f8;
+uintptr_t uart_platform_base(int idx)
+{
+	return (uintptr_t) buf;
+}
+
+void uart_init(int idx)
+{
+}
+
+unsigned char uart_rx_byte(int idx)
+{
+	return *buf;
+}
+
+void uart_tx_byte(int idx, unsigned char data)
+{
+	*buf = data;
+}
+
+void uart_tx_flush(int idx)
+{
+}
+
+#ifndef __PRE_RAM__
+void uart_fill_lb(void *data)
+{
+	struct lb_serial serial;
+	serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
+	serial.baseaddr = 0x3f8;
+	serial.baud = 115200;
+	lb_add_serial(&serial, data);
+        lb_add_console(LB_TAG_CONSOLE_SERIAL8250MEM, data);
+}
+#endif