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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/tty/hvc/hvc_rtas.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/tty/hvc/hvc_rtas.c')
-rw-r--r--kernel/drivers/tty/hvc/hvc_rtas.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/kernel/drivers/tty/hvc/hvc_rtas.c b/kernel/drivers/tty/hvc/hvc_rtas.c
new file mode 100644
index 000000000..08c87920b
--- /dev/null
+++ b/kernel/drivers/tty/hvc/hvc_rtas.c
@@ -0,0 +1,123 @@
+/*
+ * IBM RTAS driver interface to hvc_console.c
+ *
+ * (C) Copyright IBM Corporation 2001-2005
+ * (C) Copyright Red Hat, Inc. 2005
+ *
+ * Author(s): Maximino Augilar <IBM STI Design Center>
+ * : Ryan S. Arnold <rsa@us.ibm.com>
+ * : Utz Bacher <utz.bacher@de.ibm.com>
+ * : David Woodhouse <dwmw2@infradead.org>
+ *
+ * inspired by drivers/char/hvc_console.c
+ * written by Anton Blanchard and Paul Mackerras
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <asm/irq.h>
+#include <asm/rtas.h>
+#include "hvc_console.h"
+
+#define hvc_rtas_cookie 0x67781e15
+struct hvc_struct *hvc_rtas_dev;
+
+static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
+static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
+
+static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
+ int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
+ break;
+ }
+
+ return i;
+}
+
+static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
+{
+ int i, c;
+
+ for (i = 0; i < count; i++) {
+ if (rtas_call(rtascons_get_char_token, 0, 2, &c))
+ break;
+
+ buf[i] = c;
+ }
+
+ return i;
+}
+
+static const struct hv_ops hvc_rtas_get_put_ops = {
+ .get_chars = hvc_rtas_read_console,
+ .put_chars = hvc_rtas_write_console,
+};
+
+static int __init hvc_rtas_init(void)
+{
+ struct hvc_struct *hp;
+
+ if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+ rtascons_put_char_token = rtas_token("put-term-char");
+ if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+ return -EIO;
+
+ if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+ rtascons_get_char_token = rtas_token("get-term-char");
+ if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+ return -EIO;
+
+ BUG_ON(hvc_rtas_dev);
+
+ /* Allocate an hvc_struct for the console device we instantiated
+ * earlier. Save off hp so that we can return it on exit */
+ hp = hvc_alloc(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops, 16);
+ if (IS_ERR(hp))
+ return PTR_ERR(hp);
+
+ hvc_rtas_dev = hp;
+
+ return 0;
+}
+device_initcall(hvc_rtas_init);
+
+/* This will happen prior to module init. There is no tty at this time? */
+static int __init hvc_rtas_console_init(void)
+{
+ rtascons_put_char_token = rtas_token("put-term-char");
+ if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+ return -EIO;
+
+ rtascons_get_char_token = rtas_token("get-term-char");
+ if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+ return -EIO;
+
+ hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
+ add_preferred_console("hvc", 0, NULL);
+
+ return 0;
+}
+console_initcall(hvc_rtas_console_init);