MIPS: TXx9: Early command-line preprocessing

* Select board by command-line option or firmware environment variable.
* Handle "masterclk=" option.
* Add boards.h to centerize board_vec declaration.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

 create mode 100644 include/asm-mips/txx9/boards.h

2 files changed, 78 insertions, 6 deletions

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index 005179c2af21..dc5dbcc53a91 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -119,14 +119,31 @@ int irq_to_gpio(unsigned irq)
 EXPORT_SYMBOL(irq_to_gpio);
 #endif
 
-extern struct txx9_board_vec jmr3927_vec;
-extern struct txx9_board_vec rbtx4927_vec;
-extern struct txx9_board_vec rbtx4937_vec;
-extern struct txx9_board_vec rbtx4938_vec;
+#define BOARD_VEC(board)        extern struct txx9_board_vec board;
+#include <asm/txx9/boards.h>
+#undef BOARD_VEC
 
 struct txx9_board_vec *txx9_board_vec __initdata;
 static char txx9_system_type[32];
 
+static struct txx9_board_vec *board_vecs[] __initdata = {
+#define BOARD_VEC(board)        &board,
+#include <asm/txx9/boards.h>
+#undef BOARD_VEC
+};
+
+static struct txx9_board_vec *__init find_board_byname(const char *name)
+{
+        int i;
+
+        /* search board_vecs table */
+        for (i = 0; i < ARRAY_SIZE(board_vecs); i++) {
+                if (strstr(board_vecs[i]->system, name))
+                        return board_vecs[i];
+        }
+        return NULL;
+}
+
 static void __init prom_init_cmdline(void)
 {
         int argc = (int)fw_arg0;
@@ -169,9 +186,47 @@ static void __init prom_init_cmdline(void)
         }
 }
 
-void __init prom_init(void)
+static void __init preprocess_cmdline(void)
 {
-        prom_init_cmdline();
+        char cmdline[CL_SIZE];
+        char *s;
+
+        strcpy(cmdline, arcs_cmdline);
+        s = cmdline;
+        arcs_cmdline[0] = '\0';
+        while (s && *s) {
+                char *str = strsep(&s, " ");
+                if (strncmp(str, "board=", 6) == 0) {
+                        txx9_board_vec = find_board_byname(str + 6);
+                        continue;
+                } else if (strncmp(str, "masterclk=", 10) == 0) {
+                        unsigned long val;
+                        if (strict_strtoul(str + 10, 10, &val) == 0)
+                                txx9_master_clock = val;
+                        continue;
+                }
+                if (arcs_cmdline[0])
+                        strcat(arcs_cmdline, " ");
+                strcat(arcs_cmdline, str);
+        }
+}
+
+static void __init select_board(void)
+{
+        const char *envstr;
+
+        /* first, determine by "board=" argument in preprocess_cmdline() */
+        if (txx9_board_vec)
+                return;
+        /* next, determine by "board" envvar */
+        envstr = prom_getenv("board");
+        if (envstr) {
+                txx9_board_vec = find_board_byname(envstr);
+                if (txx9_board_vec)
+                        return;
+        }
+
+        /* select "default" board */
 #ifdef CONFIG_CPU_TX39XX
         txx9_board_vec = &jmr3927_vec;
 #endif
@@ -192,6 +247,13 @@ void __init prom_init(void)
 #endif
         }
 #endif
+}
+
+void __init prom_init(void)
+{
+        prom_init_cmdline();
+        preprocess_cmdline();
+        select_board();
 
         strcpy(txx9_system_type, txx9_board_vec->system);
 
diff --git a/include/asm-mips/txx9/boards.h b/include/asm-mips/txx9/boards.h
new file mode 100644
index 000000000000..4abc8142fbb7
--- /dev/null
+++ b/include/asm-mips/txx9/boards.h
@@ -0,0 +1,10 @@
+#ifdef CONFIG_TOSHIBA_JMR3927
+BOARD_VEC(jmr3927_vec)
+#endif
+#ifdef CONFIG_TOSHIBA_RBTX4927
+BOARD_VEC(rbtx4927_vec)
+BOARD_VEC(rbtx4937_vec)
+#endif
+#ifdef CONFIG_TOSHIBA_RBTX4938
+BOARD_VEC(rbtx4938_vec)
+#endif