MIPS: qemu-malta: add support for emulated MIPS Malta board

Add minimal support for the MIPS Malta CoreLV board
emulated by Qemu. The only supported peripherial is
the UART.

This is enough to boot U-Boot to the command prompt
both in little and big endian mode.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>

6 files changed, 206 insertions, 0 deletions

diff --git a/arch/mips/include/asm/malta.h b/arch/mips/include/asm/malta.h
new file mode 100644
index 00000000000..b2151649f06
--- /dev/null
+++ b/arch/mips/include/asm/malta.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#ifndef _MIPS_ASM_MALTA_H
+#define _MIPS_ASM_MALTA_H
+
+#define MALTA_IO_PORT_BASE	0x10000000
+
+#define MALTA_UART_BASE		(MALTA_IO_PORT_BASE + 0x3f8)
+
+#endif /* _MIPS_ASM_MALTA_H */
diff --git a/board/qemu-malta/Makefile b/board/qemu-malta/Makefile
new file mode 100644
index 00000000000..6251bb84adc
--- /dev/null
+++ b/board/qemu-malta/Makefile
@@ -0,0 +1,45 @@
+#
+# (C) Copyright 2003-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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; either version 2 of
+# the License, or (at your option) any later version.
+#
+# 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., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(BOARD).o
+
+COBJS	= $(BOARD).o
+SOBJS	= lowlevel_init.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	 $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/board/qemu-malta/lowlevel_init.S b/board/qemu-malta/lowlevel_init.S
new file mode 100644
index 00000000000..c5c5bd98a96
--- /dev/null
+++ b/board/qemu-malta/lowlevel_init.S
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <asm/regdef.h>
+
+	.text
+	.set noreorder
+	.set mips32
+
+	.globl	lowlevel_init
+lowlevel_init:
+
+	jr	ra
+	 nop
diff --git a/board/qemu-malta/qemu-malta.c b/board/qemu-malta/qemu-malta.c
new file mode 100644
index 00000000000..9ba711dba3d
--- /dev/null
+++ b/board/qemu-malta/qemu-malta.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <common.h>
+
+phys_size_t initdram(int board_type)
+{
+	return CONFIG_SYS_MEM_SIZE;
+}
+
+int checkboard(void)
+{
+	puts("Board: MIPS Malta CoreLV (Qemu)\n");
+	return 0;
+}
diff --git a/boards.cfg b/boards.cfg
index 6a368de800c..944ed4cf05b 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -470,6 +470,8 @@ qemu_mips                    mips        mips32      qemu-mips           -
 qemu_mipsel                  mips        mips32      qemu-mips           -              -           qemu-mips:SYS_LITTLE_ENDIAN
 qemu_mips64                  mips        mips64      qemu-mips           -              -           qemu-mips64:SYS_BIG_ENDIAN
 qemu_mips64el                mips        mips64      qemu-mips           -              -           qemu-mips64:SYS_LITTLE_ENDIAN
+qemu_malta                   mips        mips32      qemu-malta          -              -           qemu-malta:MIPS32,SYS_BIG_ENDIAN
+qemu_maltael                 mips        mips32      qemu-malta          -              -           qemu-malta:MIPS32,SYS_LITTLE_ENDIAN
 vct_platinum                 mips        mips32      vct                 micronas       -           vct:VCT_PLATINUM
 vct_platinumavc              mips        mips32      vct                 micronas       -           vct:VCT_PLATINUMAVC
 vct_platinumavc_onenand      mips        mips32      vct                 micronas       -           vct:VCT_PLATINUMAVC,VCT_ONENAND
diff --git a/include/configs/qemu-malta.h b/include/configs/qemu-malta.h
new file mode 100644
index 00000000000..c72c5dd8898
--- /dev/null
+++ b/include/configs/qemu-malta.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#ifndef _QEMU_MALTA_CONFIG_H
+#define _QEMU_MALTA_CONFIG_H
+
+#include <asm/addrspace.h>
+#include <asm/malta.h>
+
+/*
+ * System configuration
+ */
+#define CONFIG_QEMU_MALTA
+
+/*
+ * CPU Configuration
+ */
+#define CONFIG_SYS_MHZ			250	/* arbitrary value */
+#define CONFIG_SYS_MIPS_TIMER_FREQ	(CONFIG_SYS_MHZ * 1000000)
+#define CONFIG_SYS_HZ			1000
+
+#define CONFIG_SYS_DCACHE_SIZE		16384	/* arbitrary value */
+#define CONFIG_SYS_ICACHE_SIZE		16384	/* arbitrary value */
+#define CONFIG_SYS_CACHELINE_SIZE	32	/* arbitrary value */
+
+#define CONFIG_SWAP_IO_SPACE
+
+/*
+ * Memory map
+ */
+#define CONFIG_SYS_TEXT_BASE		0xbfc00000 /* Rom version */
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
+
+#define CONFIG_SYS_SDRAM_BASE		0x80000000 /* Cached addr */
+#define CONFIG_SYS_MEM_SIZE		(256 * 1024 * 1024)
+
+#define CONFIG_SYS_INIT_SP_OFFSET	0x400000
+
+#define CONFIG_SYS_LOAD_ADDR		0x81000000
+#define CONFIG_SYS_MEMTEST_START	0x80100000
+#define CONFIG_SYS_MEMTEST_END		0x80800000
+
+#define CONFIG_SYS_MALLOC_LEN		(128 * 1024)
+#define CONFIG_SYS_BOOTPARAMS_LEN	(128 * 1024)
+
+/*
+ * Console configuration
+ */
+#if defined(CONFIG_SYS_LITTLE_ENDIAN)
+#define CONFIG_SYS_PROMPT		"qemu-maltael # "
+#else
+#define CONFIG_SYS_PROMPT		"qemu-malta # "
+#endif
+
+#define CONFIG_SYS_CBSIZE		256
+#define CONFIG_SYS_PBSIZE		(CONFIG_SYS_CBSIZE + \
+					 sizeof(CONFIG_SYS_PROMPT) + 16)
+#define CONFIG_SYS_MAXARGS		16
+
+#define CONFIG_AUTO_COMPLETE
+#define CONFIG_CMDLINE_EDITING
+
+/*
+ * Serial driver
+ */
+#define CONFIG_BAUDRATE			115200
+
+#define CONFIG_SYS_NS16550
+#define CONFIG_SYS_NS16550_SERIAL
+#define CONFIG_SYS_NS16550_REG_SIZE	1
+#define CONFIG_SYS_NS16550_CLK		115200
+#define CONFIG_SYS_NS16550_COM1		CKSEG1ADDR(MALTA_UART_BASE)
+#define CONFIG_CONS_INDEX		1
+
+/*
+ * Environment
+ */
+#define CONFIG_ENV_IS_NOWHERE
+#define CONFIG_ENV_SIZE			0x10000
+
+/*
+ * Flash configuration
+ */
+#define CONFIG_SYS_NO_FLASH
+
+/*
+ * Commands
+ */
+#include <config_cmd_default.h>
+
+#undef CONFIG_CMD_FPGA
+#undef CONFIG_CMD_LOADB
+#undef CONFIG_CMD_LOADS
+#undef CONFIG_CMD_NET
+#undef CONFIG_CMD_NFS
+
+#define CONFIG_SYS_LONGHELP		/* verbose help, undef to save memory */
+
+#endif /* _QEMU_MALTA_CONFIG_H */