add MACHINE_CHIPSET in header files, and add common settings in machine_defs.h

machine.h

@@ -15,8 +15,48 @@
 
 #define MACHINE_INC(dir,file) MACHINE_STR(dir/file)
 
+#define RTL8370 0x70
+#define RTL8372 0x72
+#define RTL8373 0x73
+
 #include  MACHINE_INC(MACHINE_DEF_DIR,MACHINE_NAME.h)
 
+
+#ifndef MACHINE_CHIPSET
+#error "MACHINE_CHIPSET shall be defined in <machine>.h file"
+#endif
+
+#ifndef MACHINE_MIN_PORT
+#if MACHINE_CHIPSET == RTL8372
+#define MACHINE_MIN_PORT 3
+#else
+#define MACHINE_MIN_PORT 0
+#endif
+#endif
+
+#ifndef MACHINE_MAX_PORT
+#if MACHINE_CHIPSET == RTL8370
+#define MACHINE_MAX_PORT 7
+#else
+#define MACHINE_MAX_PORT 8
+#endif
+#endif
+
+// auto derive SOC_FAMILY
+#define RTL836X 6
+#define RTL837X 7
+
+#ifdef SOC_FAMILY
+#error "SOC_FAMILY can not define manually, shall be auto derived"
+#endif
+#if (MACHINE_CHIPSET == RTL8372) || (MACHINE_CHIPSET == RTL8373)
+#define SOC_FAMILY RTL837X
+#elif (MACHINE_CHIPSET == RTL8370 )
+#define SOC_FAMILY RTL836X
+#else
+#error "Unsupport MACHINE_CHIPSET is specified!"
+#endif
+
 #define LED_27 1
 // SYSTEM LED
 #define LED_28_SYS 2