[POWERPC] Celleb: hypervisor console driver

This patch adds hypervisor console driver for Celleb platform.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/drivers/char/hvc_beat.c b/drivers/char/hvc_beat.c
new file mode 100644
index 000000000000..6f019f19be71
--- /dev/null
+++ b/drivers/char/hvc_beat.c
@@ -0,0 +1,134 @@
+/*
+ * Beat hypervisor console driver
+ *
+ * (C) Copyright 2006 TOSHIBA CORPORATION
+ *
+ * This code is based on drivers/char/hvc_rtas.c:
+ * (C) Copyright IBM Corporation 2001-2005
+ * (C) Copyright Red Hat, Inc. 2005
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/console.h>
+#include <asm/prom.h>
+#include <asm/hvconsole.h>
+#include <asm/firmware.h>
+
+#include "hvc_console.h"
+
+extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *);
+extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t);
+
+struct hvc_struct *hvc_beat_dev = NULL;
+
+/* bug: only one queue is available regardless of vtermno */
+static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt)
+{
+        static unsigned char q[sizeof(unsigned long) * 2]
+                __attribute__((aligned(sizeof(unsigned long))));
+        static int qlen = 0;
+        unsigned long got;
+
+again:
+        if (qlen) {
+                if (qlen > cnt) {
+                        memcpy(buf, q, cnt);
+                        qlen -= cnt;
+                        memmove(q + cnt, q, qlen);
+                        return cnt;
+                } else {        /* qlen <= cnt */
+                        int     r;
+
+                        memcpy(buf, q, qlen);
+                        r = qlen;
+                        qlen = 0;
+                        return r;
+                }
+        }
+        if (beat_get_term_char(vtermno, &got,
+                ((unsigned long *)q), ((unsigned long *)q) + 1) == 0) {
+                qlen = got;
+                goto again;
+        }
+        return 0;
+}
+
+static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt)
+{
+        unsigned long kb[2];
+        int rest, nlen;
+
+        for (rest = cnt; rest > 0; rest -= nlen) {
+                nlen = (rest > 16) ? 16 : rest;
+                memcpy(kb, buf, nlen);
+                beat_put_term_char(vtermno, rest, kb[0], kb[1]);
+                rest -= nlen;
+        }
+        return cnt;
+}
+
+static struct hv_ops hvc_beat_get_put_ops = {
+        .get_chars = hvc_beat_get_chars,
+        .put_chars = hvc_beat_put_chars,
+};
+
+static int hvc_beat_useit = 1;
+
+static int hvc_beat_config(char *p)
+{
+        hvc_beat_useit = simple_strtoul(p, NULL, 0);
+        return 0;
+}
+
+static int hvc_beat_console_init(void)
+{
+        if (hvc_beat_useit && machine_is_compatible("Beat")) {
+                hvc_instantiate(0, 0, &hvc_beat_get_put_ops);
+        }
+        return 0;
+}
+
+/* temp */
+static int hvc_beat_init(void)
+{
+        struct hvc_struct *hp;
+
+        if (!firmware_has_feature(FW_FEATURE_BEAT))
+                return -ENODEV;
+
+        hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+        hvc_beat_dev = hp;
+        return 0;
+}
+
+static void __exit hvc_beat_exit(void)
+{
+        if (hvc_beat_dev)
+                hvc_remove(hvc_beat_dev);
+}
+
+module_init(hvc_beat_init);
+module_exit(hvc_beat_exit);
+
+__setup("hvc_beat=", hvc_beat_config);
+
+console_initcall(hvc_beat_console_init);