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-rw-r--r--drivers/char/hvc_vio.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
new file mode 100644
index 000000000000..60bb9152b832
--- /dev/null
+++ b/drivers/char/hvc_vio.c
@@ -0,0 +1,152 @@
1/*
2 * vio driver interface to hvc_console.c
3 *
4 * This code was moved here to allow the remaing code to be reused as a
5 * generic polling mode with semi-reliable transport driver core to the
6 * console and tty subsystems.
7 *
8 *
9 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
10 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
11 * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
12 * Copyright (C) 2004 IBM Corporation
13 *
14 * Additional Author(s):
15 * Ryan S. Arnold <rsa@us.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 */
31
32#include <linux/types.h>
33#include <linux/init.h>
34#include <asm/hvconsole.h>
35#include <asm/vio.h>
36#include <asm/prom.h>
37
38char hvc_driver_name[] = "hvc_console";
39
40static struct vio_device_id hvc_driver_table[] __devinitdata = {
41 {"serial", "hvterm1"},
42 { NULL, }
43};
44MODULE_DEVICE_TABLE(vio, hvc_driver_table);
45
46static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
47{
48 unsigned long got;
49 int i;
50
51 got = hvc_get_chars(vtermno, buf, count);
52
53 /*
54 * Work around a HV bug where it gives us a null
55 * after every \r. -- paulus
56 */
57 for (i = 1; i < got; ++i) {
58 if (buf[i] == 0 && buf[i-1] == '\r') {
59 --got;
60 if (i < got)
61 memmove(&buf[i], &buf[i+1],
62 got - i);
63 }
64 }
65 return got;
66}
67
68static struct hv_ops hvc_get_put_ops = {
69 .get_chars = filtered_get_chars,
70 .put_chars = hvc_put_chars,
71};
72
73static int __devinit hvc_vio_probe(struct vio_dev *vdev,
74 const struct vio_device_id *id)
75{
76 struct hvc_struct *hp;
77
78 /* probed with invalid parameters. */
79 if (!vdev || !id)
80 return -EPERM;
81
82 hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops);
83 if (IS_ERR(hp))
84 return PTR_ERR(hp);
85 dev_set_drvdata(&vdev->dev, hp);
86
87 return 0;
88}
89
90static int __devexit hvc_vio_remove(struct vio_dev *vdev)
91{
92 struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
93
94 return hvc_remove(hp);
95}
96
97static struct vio_driver hvc_vio_driver = {
98 .name = hvc_driver_name,
99 .id_table = hvc_driver_table,
100 .probe = hvc_vio_probe,
101 .remove = hvc_vio_remove,
102 .driver = {
103 .owner = THIS_MODULE,
104 }
105};
106
107static int hvc_vio_init(void)
108{
109 int rc;
110
111 /* Register as a vio device to receive callbacks */
112 rc = vio_register_driver(&hvc_vio_driver);
113
114 return rc;
115}
116module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
117
118static void hvc_vio_exit(void)
119{
120 vio_unregister_driver(&hvc_vio_driver);
121}
122module_exit(hvc_vio_exit);
123
124/* the device tree order defines our numbering */
125static int hvc_find_vtys(void)
126{
127 struct device_node *vty;
128 int num_found = 0;
129
130 for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
131 vty = of_find_node_by_name(vty, "vty")) {
132 uint32_t *vtermno;
133
134 /* We have statically defined space for only a certain number
135 * of console adapters.
136 */
137 if (num_found >= MAX_NR_HVC_CONSOLES)
138 break;
139
140 vtermno = (uint32_t *)get_property(vty, "reg", NULL);
141 if (!vtermno)
142 continue;
143
144 if (device_is_compatible(vty, "hvterm1")) {
145 hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
146 ++num_found;
147 }
148 }
149
150 return num_found;
151}
152console_initcall(hvc_find_vtys);