[POWERPC] Celleb: support udbg

This patch adds udbg support for Celleb platform.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/celleb/udbg_beat.c b/arch/powerpc/platforms/celleb/udbg_beat.c
new file mode 100644
index 00000000000..d888c4674c6
--- /dev/null
+++ b/arch/powerpc/platforms/celleb/udbg_beat.c
@@ -0,0 +1,97 @@
+/*
+ * udbg function for Beat
+ *
+ * (C) Copyright 2006 TOSHIBA CORPORATION
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/console.h>
+
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+
+#include "beat.h"
+
+#define celleb_vtermno  0
+
+static void udbg_putc_beat(char c)
+{
+        unsigned long rc;
+
+        if (c == '\n')
+                udbg_putc_beat('\r');
+
+        rc = beat_put_term_char(celleb_vtermno, 1, (uint64_t)c << 56, 0);
+}
+
+/* Buffered chars getc */
+static long inbuflen;
+static long inbuf[2];   /* must be 2 longs */
+
+static int udbg_getc_poll_beat(void)
+{
+        /* The interface is tricky because it may return up to 16 chars.
+         * We save them statically for future calls to udbg_getc().
+         */
+        char ch, *buf = (char *)inbuf;
+        int i;
+        long rc;
+        if (inbuflen == 0) {
+                /* get some more chars. */
+                inbuflen = 0;
+                rc = beat_get_term_char(celleb_vtermno, &inbuflen, inbuf+0, inbuf+1);
+                if (rc != 0)
+                        inbuflen = 0;   /* otherwise inbuflen is garbage */
+        }
+        if (inbuflen <= 0 || inbuflen > 16) {
+                /* Catch error case as well as other oddities (corruption) */
+                inbuflen = 0;
+                return -1;
+        }
+        ch = buf[0];
+        for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
+                buf[i-1] = buf[i];
+        inbuflen--;
+        return ch;
+}
+
+static int udbg_getc_beat(void)
+{
+        int ch;
+        for (;;) {
+                ch = udbg_getc_poll_beat();
+                if (ch == -1) {
+                        /* This shouldn't be needed...but... */
+                        volatile unsigned long delay;
+                        for (delay=0; delay < 2000000; delay++)
+                                ;
+                } else {
+                        return ch;
+                }
+        }
+}
+
+/* call this from early_init() for a working debug console on
+ * vterm capable LPAR machines
+ */
+void __init udbg_init_debug_beat(void)
+{
+        udbg_putc = udbg_putc_beat;
+        udbg_getc = udbg_getc_beat;
+        udbg_getc_poll = udbg_getc_poll_beat;
+}