MIPS:Target support for qemu -M mips

With serial, NE2000, IDE support. Tested in big-endian mode.
Memory size hard-coded to 128M for now, so don't play with
the -m option.

Signed-off-by: Vlad Lungu <vlad@comsys.ro>

11 files changed, 482 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index fed45f74d..fb10ff724 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -583,6 +583,9 @@ Thomas Lange <thomas@corelatus.se>
 	dbau1x00		MIPS32 Au1000
 	gth2			MIPS32 Au1000
 
+Vlad Lungu <vlad@comsys.ro>
+	qemu_mips		MIPS32
+
 #########################################################################
 # Nios-32 Systems:							#
 #									#
diff --git a/MAKEALL b/MAKEALL
index 8e6713e46..a4384b9aa 100755
--- a/MAKEALL
+++ b/MAKEALL
@@ -543,6 +543,7 @@ LIST_arm="		\
 
 LIST_mips4kc="		\
 	incaip		\
+	qemu_mips	\
 "
 
 LIST_mips5kc="		\
diff --git a/Makefile b/Makefile
index 1b3d2e64e..f45c326d0 100644
--- a/Makefile
+++ b/Makefile
@@ -2601,6 +2601,12 @@ pb1000_config		:	unconfig
 	@echo "#define CONFIG_PB1000 1" >>$(obj)include/config.h
 	@$(MKCONFIG) -a pb1x00 mips mips pb1x00
 
+qemu_mips_config: unconfig
+	@mkdir -p $(obj)include
+	@ >$(obj)include/config.h
+	@echo "#define CONFIG_QEMU_MIPS 1" >>$(obj)include/config.h
+	@$(MKCONFIG) -a qemu-mips mips mips qemu-mips
+
 #########################################################################
 ## MIPS64 5Kc
 #########################################################################
diff --git a/board/qemu-mips/Makefile b/board/qemu-mips/Makefile
new file mode 100644
index 000000000..23be44742
--- /dev/null
+++ b/board/qemu-mips/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).a
+
+COBJS	= $(BOARD).o flash.o
+SOBJS	= lowlevel_init.o
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	 $(OBJS) $(SOBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/board/qemu-mips/README b/board/qemu-mips/README
new file mode 100644
index 000000000..39570b13d
--- /dev/null
+++ b/board/qemu-mips/README
@@ -0,0 +1,11 @@
+By Vlad Lungu vlad@comsys.ro 2007-Oct-01
+----------------------------------------
+Qemu is a full system emulator. See
+
+http://fabrice.bellard.free.fr/qemu
+
+Limitations & comments
+----------------------
+Supports the "-m mips" configuration of qemu: serial,NE2000,IDE.
+Support is big endian only for now (or at least this is what I tested).
+Derived from au1x00 with a lot of things cut out.
diff --git a/board/qemu-mips/config.mk b/board/qemu-mips/config.mk
new file mode 100644
index 000000000..4d4078a40
--- /dev/null
+++ b/board/qemu-mips/config.mk
@@ -0,0 +1,10 @@
+#
+# Qemu -M mips system emulator
+# See http://fabrice.bellard.free.fr/qemu
+#
+
+# ROM version
+TEXT_BASE = 0xbfc00000
+
+# RAM version
+#TEXT_BASE = 0x80001000
diff --git a/board/qemu-mips/flash.c b/board/qemu-mips/flash.c
new file mode 100644
index 000000000..e98827201
--- /dev/null
+++ b/board/qemu-mips/flash.c
@@ -0,0 +1,40 @@
+/*
+ * (C) Copyright 2003
+ * 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 <common.h>
+/*-----------------------------------------------------------------------
+ * flash_init()
+ *
+ * sets up flash_info and returns size of FLASH (bytes)
+ */
+unsigned long flash_init(void)
+{
+	printf("Skipping flash_init\n");
+	return(0);
+}
+
+int write_buff(void *info, uchar *src, ulong addr, ulong cnt)
+{
+	printf("write_buff not implemented\n");
+	return(-1);
+}
diff --git a/board/qemu-mips/lowlevel_init.S b/board/qemu-mips/lowlevel_init.S
new file mode 100644
index 000000000..28166bceb
--- /dev/null
+++ b/board/qemu-mips/lowlevel_init.S
@@ -0,0 +1,41 @@
+/* Memory sub-system initialization code */
+
+#include <config.h>
+#include <version.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+
+	.text
+	.set noreorder
+	.set mips32
+
+	.globl	lowlevel_init
+lowlevel_init:
+
+	/*
+	 * Step 2) Establish Status Register
+	 * (set BEV, clear ERL, clear EXL, clear IE)
+	 */
+	li	t1, 0x00400000
+	mtc0	t1, CP0_STATUS
+
+	/*
+	 * Step 3) Establish CP0 Config0
+	 * (set K0=3)
+	 */
+	li	t1, 0x00000003
+	mtc0	t1, CP0_CONFIG
+
+	/*
+	 * Step 7) Establish Cause
+	 * (set IV bit)
+	 */
+	li	t1, 0x00800000
+	mtc0	t1, CP0_CAUSE
+
+	/* Establish Wired (and Random) */
+	mtc0	zero, CP0_WIRED
+	nop
+
+	j	ra
+	nop
diff --git a/board/qemu-mips/qemu-mips.c b/board/qemu-mips/qemu-mips.c
new file mode 100644
index 000000000..a6ad7b9ab
--- /dev/null
+++ b/board/qemu-mips/qemu-mips.c
@@ -0,0 +1,89 @@
+/*
+ * (C) Copyright 2007
+ * Vlad Lungu vlad@comsys.ro
+ *
+ * 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 <common.h>
+#include <command.h>
+#include <asm/mipsregs.h>
+#include <asm/io.h>
+
+long int initdram(int board_type)
+{
+	/* Sdram is setup by assembler code */
+	/* If memory could be changed, we should return the true value here */
+	return MEM_SIZE*1024*1024;
+}
+
+int checkboard(void)
+{
+	u32 proc_id;
+	u32 config1;
+
+	proc_id = read_32bit_cp0_register(CP0_PRID);
+	printf("Board: Qemu -M mips CPU: ");
+	switch (proc_id) {
+	case 0x00018000:
+		printf("4Kc");
+		break;
+	case 0x00018400:
+		printf("4KEcR1");
+		break;
+	case 0x00019000:
+		printf("4KEc");
+		break;
+	case 0x00019300:
+		config1 = read_mips32_cp0_config1();
+		if (config1 & 1)
+			printf("24Kf");
+		else
+			printf("24Kc");
+		break;
+	case 0x00019500:
+		printf("34Kf");
+		break;
+	case 0x00000400:
+		printf("R4000");
+		break;
+	case 0x00018100:
+		config1 = read_mips32_cp0_config1();
+		if (config1 & 1)
+			printf("5Kf");
+		else
+			printf("5Kc");
+		break;
+	case 0x000182a0:
+		printf("20Kc");
+		break;
+
+	default:
+		printf("unknown");
+	}
+	printf(" proc_id=0x%x\n", proc_id);
+
+	return 0;
+}
+
+int misc_init_r(void)
+{
+	set_io_port_base(0);
+	return 0;
+}
diff --git a/board/qemu-mips/u-boot.lds b/board/qemu-mips/u-boot.lds
new file mode 100644
index 000000000..c2a85661e
--- /dev/null
+++ b/board/qemu-mips/u-boot.lds
@@ -0,0 +1,72 @@
+/*
+ * (C) Copyright 2003
+ * Wolfgang Denk 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
+ */
+
+/*
+OUTPUT_FORMAT("elf32-bigmips", "elf32-bigmips", "elf32-bigmips")
+*/
+OUTPUT_FORMAT("elf32-tradbigmips", "elf32-tradbigmips", "elf32-tradbigmips")
+OUTPUT_ARCH(mips)
+ENTRY(_start)
+SECTIONS
+{
+	. = 0x00000000;
+
+	. = ALIGN(4);
+	.text       :
+	{
+	  *(.text)
+	}
+
+	. = ALIGN(4);
+	.rodata  : { *(.rodata) }
+
+	. = ALIGN(4);
+	.data  : { *(.data) }
+
+	. = .;
+	_gp = ALIGN(16) +0x7ff0;
+
+	.got  : {
+	__got_start = .;
+		*(.got)
+	__got_end = .;
+	}
+
+	. = ALIGN(4);
+	.sdata  : { *(.sdata) }
+
+	. = .;
+	.u_boot_cmd : {
+	__u_boot_cmd_start = .;
+	*(.u_boot_cmd)
+	__u_boot_cmd_end = .;
+	}
+
+	uboot_end_data = .;
+	num_got_entries = (__got_end - __got_start) >> 2;
+
+	. = ALIGN(4);
+	.sbss  : { *(.sbss) }
+	.bss  : { *(.bss) }
+	uboot_end = .;
+}
diff --git a/include/configs/qemu-mips.h b/include/configs/qemu-mips.h
new file mode 100644
index 000000000..8fdb8e35f
--- /dev/null
+++ b/include/configs/qemu-mips.h
@@ -0,0 +1,164 @@
+/*
+ * (C) Copyright 2003
+ * 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
+ */
+
+/*
+ * This file contains the configuration parameters for the dbau1x00 board.
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#define CONFIG_MIPS32		1  /* MIPS32 CPU core	*/
+#define CONFIG_QEMU_MIPS        1
+#define CONFIG_MISC_INIT_R
+
+#undef DEBUG
+
+/*IP address is default used by Qemu*/
+#define CONFIG_IPADDR		10.0.2.15    	     /* Our IP address */
+#define CONFIG_SERVERIP		10.0.2.2	     /* Server IP address*/
+
+#define CONFIG_BOOTDELAY	10	/* autoboot after 10 seconds	*/
+
+#define CONFIG_BAUDRATE		115200
+
+/* valid baudrates */
+#define CFG_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
+
+#define	CONFIG_TIMESTAMP		/* Print image info with timestamp */
+#undef	CONFIG_BOOTARGS
+
+#define	CONFIG_EXTRA_ENV_SETTINGS					\
+	"addmisc=setenv bootargs ${bootargs} "				\
+		"console=ttyS0,${baudrate} "				\
+		"panic=1\0"						\
+	"bootfile=/tftpboot/vmlinux\0"				\
+	"load=tftp 80500000 ${u-boot}\0"				\
+	""
+
+#define CONFIG_BOOTCOMMAND	"bootp;bootelf"
+
+
+/*
+ * BOOTP options
+ */
+#define CONFIG_BOOTP_BOOTFILESIZE
+#define CONFIG_BOOTP_BOOTPATH
+#define CONFIG_BOOTP_GATEWAY
+#define CONFIG_BOOTP_HOSTNAME
+
+
+/*
+ * Command line configuration.
+ */
+#include <config_cmd_default.h>
+
+#define CONFIG_CMD_ELF
+#define CONFIG_CMD_FAT
+#define CONFIG_CMD_EXT2
+#undef  CONFIG_CMD_IMLS
+#undef  CONFIG_CMD_FLASH
+#undef  CONFIG_CMD_LOADB
+#undef  CONFIG_CMD_LOADS
+#define CONFIG_CMD_DHCP
+
+#define CONFIG_DRIVER_NE2000
+#define CONFIG_DRIVER_NE2000_BASE	(0xb4000300)
+
+#define CFG_NO_FLASH
+#define CFG_NS16550
+#define CFG_NS16550_SERIAL
+#define CFG_NS16550_REG_SIZE    1
+#define CFG_NS16550_CLK         115200
+#define CFG_NS16550_COM1        (0xb40003f8)
+#define CONFIG_CONS_INDEX	1
+
+#define CONFIG_CMD_IDE
+#define CONFIG_DOS_PARTITION
+
+#define CFG_IDE_MAXBUS	2
+#define CFG_ATA_IDE0_OFFSET	(0x1f0)
+#define CFG_ATA_IDE1_OFFSET	(0x170)
+#define CFG_ATA_DATA_OFFSET	(0)
+#define CFG_ATA_REG_OFFSET	(0)
+#define CFG_ATA_BASE_ADDR	(0xb4000000)
+
+#define CFG_IDE_MAXDEVICE	(4)
+
+/*
+ * Miscellaneous configurable options
+ */
+#define	CFG_LONGHELP				/* undef to save memory      */
+
+#define	CFG_PROMPT		"qemu-mips # "	/* Monitor Command Prompt    */
+
+#define	CFG_CBSIZE		256		/* Console I/O Buffer Size   */
+#define	CFG_PBSIZE (CFG_CBSIZE+sizeof(CFG_PROMPT)+16)  /* Print Buffer Size */
+#define	CFG_MAXARGS		16		/* max number of command args*/
+
+#define CFG_MALLOC_LEN		128*1024
+
+#define CFG_BOOTPARAMS_LEN	128*1024
+
+#define CFG_MHZ			132
+
+#define CFG_HZ                  (CFG_MHZ * 1000000)
+
+#define CFG_SDRAM_BASE		0x80000000     /* Cached addr */
+
+#define	CFG_LOAD_ADDR		0x81000000     /* default load address	*/
+
+#define CFG_MEMTEST_START	0x80100000
+#define CFG_MEMTEST_END		0x80800000
+
+/*-----------------------------------------------------------------------
+ * FLASH and environment organization
+ */
+
+/* The following #defines are needed to get flash environment right */
+#define	CFG_MONITOR_BASE	TEXT_BASE
+#define	CFG_MONITOR_LEN		(192 << 10)
+
+#define CFG_INIT_SP_OFFSET	0x400000
+
+/* We boot from this flash, selected with dip switch */
+#define CFG_FLASH_BASE		0xbfc00000
+
+#define	CFG_ENV_IS_NOWHERE	1
+
+/* Address and size of Primary Environment Sector	*/
+#define CFG_ENV_SIZE		0x10000
+#undef CONFIG_NET_MULTI
+
+#define MEM_SIZE 128
+
+#undef CONFIG_MEMSIZE_IN_BYTES
+
+/*-----------------------------------------------------------------------
+ * Cache Configuration
+ */
+#define CFG_DCACHE_SIZE		16384
+#define CFG_ICACHE_SIZE		16384
+#define CFG_CACHELINE_SIZE	32
+
+#endif	/* __CONFIG_H */