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authorGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 12:03:00 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2011-01-13 12:03:00 -0800
commit728674a7e466628df2aeec6d11a2ae1ef968fb67 (patch)
tree83d2e44d05b257ab03230f5c95e0d6843f0ed2f9 /drivers/tty/hvc/hvc_vio.c
parente691d24e9c5007486bef59c589c2a2d784e0c30b (diff)
tty: move hvc drivers to drivers/tty/hvc/
As requested by Arnd Bergmann, the hvc drivers are now moved to the drivers/tty/hvc/ directory. The virtio_console.c driver was also moved, as it required the hvc_console.h file to be able to be built, and it really is a hvc driver. Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/hvc/hvc_vio.c')
-rw-r--r--drivers/tty/hvc/hvc_vio.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
new file mode 100644
index 00000000000..5e2f52b3332
--- /dev/null
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -0,0 +1,173 @@
+/*
+ * vio driver interface to hvc_console.c
+ *
+ * This code was moved here to allow the remaing code to be reused as a
+ * generic polling mode with semi-reliable transport driver core to the
+ * console and tty subsystems.
+ *
+ *
+ * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
+ * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
+ * Copyright (C) 2004 IBM Corporation
+ *
+ * Additional Author(s):
+ * Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * 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/types.h>
+#include <linux/init.h>
+
+#include <asm/hvconsole.h>
+#include <asm/vio.h>
+#include <asm/prom.h>
+#include <asm/firmware.h>
+
+#include "hvc_console.h"
+
+static const char hvc_driver_name[] = "hvc_console";
+
+static struct vio_device_id hvc_driver_table[] __devinitdata = {
+ {"serial", "hvterm1"},
+ { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, hvc_driver_table);
+
+static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
+{
+ unsigned long got;
+ int i;
+
+ /*
+ * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
+ * so we play safe and avoid the situation where got > count which could
+ * overload the flip buffer.
+ */
+ if (count < SIZE_VIO_GET_CHARS)
+ return -EAGAIN;
+
+ got = hvc_get_chars(vtermno, buf, count);
+
+ /*
+ * Work around a HV bug where it gives us a null
+ * after every \r. -- paulus
+ */
+ for (i = 1; i < got; ++i) {
+ if (buf[i] == 0 && buf[i-1] == '\r') {
+ --got;
+ if (i < got)
+ memmove(&buf[i], &buf[i+1],
+ got - i);
+ }
+ }
+ return got;
+}
+
+static const struct hv_ops hvc_get_put_ops = {
+ .get_chars = filtered_get_chars,
+ .put_chars = hvc_put_chars,
+ .notifier_add = notifier_add_irq,
+ .notifier_del = notifier_del_irq,
+ .notifier_hangup = notifier_hangup_irq,
+};
+
+static int __devinit hvc_vio_probe(struct vio_dev *vdev,
+ const struct vio_device_id *id)
+{
+ struct hvc_struct *hp;
+
+ /* probed with invalid parameters. */
+ if (!vdev || !id)
+ return -EPERM;
+
+ hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+ MAX_VIO_PUT_CHARS);
+ if (IS_ERR(hp))
+ return PTR_ERR(hp);
+ dev_set_drvdata(&vdev->dev, hp);
+
+ return 0;
+}
+
+static int __devexit hvc_vio_remove(struct vio_dev *vdev)
+{
+ struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
+
+ return hvc_remove(hp);
+}
+
+static struct vio_driver hvc_vio_driver = {
+ .id_table = hvc_driver_table,
+ .probe = hvc_vio_probe,
+ .remove = __devexit_p(hvc_vio_remove),
+ .driver = {
+ .name = hvc_driver_name,
+ .owner = THIS_MODULE,
+ }
+};
+
+static int __init hvc_vio_init(void)
+{
+ int rc;
+
+ if (firmware_has_feature(FW_FEATURE_ISERIES))
+ return -EIO;
+
+ /* Register as a vio device to receive callbacks */
+ rc = vio_register_driver(&hvc_vio_driver);
+
+ return rc;
+}
+module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
+
+static void __exit hvc_vio_exit(void)
+{
+ vio_unregister_driver(&hvc_vio_driver);
+}
+module_exit(hvc_vio_exit);
+
+/* the device tree order defines our numbering */
+static int hvc_find_vtys(void)
+{
+ struct device_node *vty;
+ int num_found = 0;
+
+ for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
+ vty = of_find_node_by_name(vty, "vty")) {
+ const uint32_t *vtermno;
+
+ /* We have statically defined space for only a certain number
+ * of console adapters.
+ */
+ if (num_found >= MAX_NR_HVC_CONSOLES) {
+ of_node_put(vty);
+ break;
+ }
+
+ vtermno = of_get_property(vty, "reg", NULL);
+ if (!vtermno)
+ continue;
+
+ if (of_device_is_compatible(vty, "hvterm1")) {
+ hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
+ ++num_found;
+ }
+ }
+
+ return num_found;
+}
+console_initcall(hvc_find_vtys);