[PATCH] powerpc: Unify udbg (#2)

This patch unifies udbg for both ppc32 and ppc64 when building the
merged achitecture. xmon now has a single "back end". The powermac udbg
stuff gets enriched with some ADB capabilities and btext output. In
addition, the early_init callback is now called on ppc32 as well,
approx. in the same order as ppc64 regarding device-tree manipulations.
The init sequences of ppc32 and ppc64 are getting closer, I'll unify
them in a later patch.

For now, you can force udbg to the scc using "sccdbg" or to btext using
"btextdbg" on powermacs. I'll implement a cleaner way of forcing udbg
output to something else than the autodetected OF output device in a
later patch.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 15 insertions, 13 deletions

diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 02baacf04366..79d434fc14d2 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -40,6 +40,7 @@
 #include <asm/xmon.h>
 #include <asm/time.h>
 #include <asm/serial.h>
+#include <asm/udbg.h>
 
 #include "setup.h"
 
@@ -173,12 +174,23 @@ void __init platform_init(void)
  */
 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 {
+        /* If btext is enabled, we might have a BAT setup for early display,
+         * thus we do enable some very basic udbg output
+         */
+#ifdef CONFIG_BOOTX_TEXT
+        udbg_putc = btext_drawchar;
+#endif
+
+        /* Do some early initialization based on the flat device tree */
         early_init_devtree(__va(dt_ptr));
 
+        /* Check default command line */
 #ifdef CONFIG_CMDLINE
-        strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
+        if (cmd_line[0] == 0)
+                strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 #endif /* CONFIG_CMDLINE */
 
+        /* Base init based on machine type */
         platform_init();
 
 #ifdef CONFIG_6xx
@@ -294,21 +306,11 @@ void __init setup_arch(char **cmdline_p)
 
         smp_setup_cpu_maps();
 
-#ifdef CONFIG_BOOTX_TEXT
-        init_boot_display();
-#endif
-
-#ifdef CONFIG_PPC_PMAC
-        /* This could be called "early setup arch", it must be done
-         * now because xmon need it
-         */
-        if (_machine == _MACH_Pmac)
-                pmac_feature_init();    /* New cool way */
-#endif
-
 #ifdef CONFIG_XMON_DEFAULT
         xmon_init(1);
 #endif
+        /* Register early console */
+        register_early_udbg_console();
 
 #if defined(CONFIG_KGDB)
         if (ppc_md.kgdb_map_scc)