[PATCH] powerpc: Early debugging support for iSeries

Connect iSeries up to the standard early debugging infrastructure.

To actually use this you need to enable the iSeries early debugging
in setup_64.c. Then after the messages are logged hit Ctrl-x Ctrl-x on
your console to dump the Hypervisor console buffer.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 15 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index ad5ef80500ce..25cdebdf6f2e 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -52,6 +52,7 @@
 #include <asm/iseries/mf.h>
 #include <asm/iseries/hv_lp_event.h>
 #include <asm/iseries/lpar_map.h>
+#include <asm/udbg.h>
 
 #include "naca.h"
 #include "setup.h"
@@ -62,10 +63,8 @@
 #include "call_sm.h"
 #include "call_hpt.h"
 
-extern void hvlog(char *fmt, ...);
-
 #ifdef DEBUG
-#define DBG(fmt...) hvlog(fmt)
+#define DBG(fmt...) udbg_printf(fmt)
 #else
 #define DBG(fmt...)
 #endif
@@ -984,3 +983,16 @@ static int __init early_parsemem(char *p)
         return 0;
 }
 early_param("mem", early_parsemem);
+
+static void hvputc(char c)
+{
+        if (c == '\n')
+                hvputc('\r');
+
+        HvCall_writeLogBuffer(&c, 1);
+}
+
+void __init udbg_init_iseries(void)
+{
+        udbg_putc = hvputc;
+}