aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/hvc_vio.c
blob: d2928f90ab5149d3f64f4ad2404d90040aa5115b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * 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>

char hvc_driver_name[] = "hvc_console";

static struct vio_device_id hvc_driver_table[] __devinitdata = {
	{"serial", "hvterm1"},
	{ NULL, }
};
MODULE_DEVICE_TABLE(vio, hvc_driver_table);

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);
	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 = {
	.name		= hvc_driver_name,
	.id_table	= hvc_driver_table,
	.probe		= hvc_vio_probe,
	.remove		= hvc_vio_remove,
	.driver		= {
		.owner	= THIS_MODULE,
	}
};

static int hvc_vio_init(void)
{
	int rc;

	/* 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 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")) {
		uint32_t *vtermno;

		/* We have statically defined space for only a certain number
		 * of console adapters.
		 */
		if (num_found >= MAX_NR_HVC_CONSOLES)
			break;

		vtermno = (uint32_t *)get_property(vty, "reg", NULL);
		if (!vtermno)
			continue;

		if (device_is_compatible(vty, "hvterm1")) {
			hvc_instantiate(*vtermno, num_found);
			++num_found;
		}
	}

	return num_found;
}
console_initcall(hvc_find_vtys);