MIPS: Loongson: Add a machtype kernel command line argument

The difference between some loongson-based machines is very small, so, if
there is no necessary to add new kernel config options to cope with this
difference, it will be better to share the same kernel image file between
them, benefit from this, the linux distribution developers only have a need
to compile the kernel one time.

This machtype kernel command line argument will be used later to share the
same kernel image file between two different machines(menglong & yeeloong)
made by lemote.

Thanks very much to Zhang Le for cleaning up the machtype implementation.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 35 insertions, 2 deletions

diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index 4e3889dec39e..656b3cc0a2a6 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -3,7 +3,7 @@
 #
 
 obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
-    pci.o bonito-irq.o mem.o
+    pci.o bonito-irq.o mem.o machtype.o
 
 #
 # Early printk support
diff --git a/arch/mips/loongson/common/machtype.c b/arch/mips/loongson/common/machtype.c
index 845b3fb47e0f..7b348248de7d 100644
--- a/arch/mips/loongson/common/machtype.c
+++ b/arch/mips/loongson/common/machtype.c
@@ -2,16 +2,49 @@
  * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
  * Author: Wu Zhangjin, wuzj@lemote.com
  *
+ * Copyright (c) 2009 Zhang Le <r0bertz@gentoo.org>
+ *
  * 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.
  */
+#include <linux/errno.h>
+#include <asm/bootinfo.h>
 
+#include <loongson.h>
 #include <machine.h>
 
+static const char *system_types[] = {
+        [MACH_LOONGSON_UNKNOWN]         "unknown loongson machine",
+        [MACH_LEMOTE_FL2E]              "lemote-fuloong-2e-box",
+        [MACH_LEMOTE_FL2F]              "lemote-fuloong-2f-box",
+        [MACH_LEMOTE_ML2F7]             "lemote-mengloong-2f-7inches",
+        [MACH_LEMOTE_YL2F89]            "lemote-yeeloong-2f-8.9inches",
+        [MACH_DEXXON_GDIUM2F10]         "dexxon-gidum-2f-10inches",
+        [MACH_LOONGSON_END]             NULL,
+};
+
 const char *get_system_type(void)
 {
-        return LOONGSON_MACHNAME;
+        if (mips_machtype == MACH_UNKNOWN)
+                mips_machtype = LOONGSON_MACHTYPE;
+
+        return system_types[mips_machtype];
 }
 
+static __init int machtype_setup(char *str)
+{
+        int machtype = MACH_LEMOTE_FL2E;
+
+        if (!str)
+                return -EINVAL;
+
+        for (; system_types[machtype]; machtype++)
+                if (strstr(system_types[machtype], str)) {
+                        mips_machtype = machtype;
+                        break;
+                }
+        return 0;
+}
+__setup("machtype=", machtype_setup);