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acad9559 MM |
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 | ||
38 | char hvc_driver_name[] = "hvc_console"; | |
39 | ||
40 | static struct vio_device_id hvc_driver_table[] __devinitdata = { | |
41 | {"serial", "hvterm1"}, | |
42 | { NULL, } | |
43 | }; | |
44 | MODULE_DEVICE_TABLE(vio, hvc_driver_table); | |
45 | ||
46 | static int __devinit hvc_vio_probe(struct vio_dev *vdev, | |
47 | const struct vio_device_id *id) | |
48 | { | |
49 | struct hvc_struct *hp; | |
50 | ||
51 | /* probed with invalid parameters. */ | |
52 | if (!vdev || !id) | |
53 | return -EPERM; | |
54 | ||
55 | hp = hvc_alloc(vdev->unit_address, vdev->irq); | |
56 | if (IS_ERR(hp)) | |
57 | return PTR_ERR(hp); | |
58 | dev_set_drvdata(&vdev->dev, hp); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int __devexit hvc_vio_remove(struct vio_dev *vdev) | |
64 | { | |
65 | struct hvc_struct *hp = dev_get_drvdata(&vdev->dev); | |
66 | ||
67 | return hvc_remove(hp); | |
68 | } | |
69 | ||
70 | static struct vio_driver hvc_vio_driver = { | |
71 | .name = hvc_driver_name, | |
72 | .id_table = hvc_driver_table, | |
73 | .probe = hvc_vio_probe, | |
74 | .remove = hvc_vio_remove, | |
75 | .driver = { | |
76 | .owner = THIS_MODULE, | |
77 | } | |
78 | }; | |
79 | ||
80 | static int hvc_vio_init(void) | |
81 | { | |
82 | int rc; | |
83 | ||
84 | /* Register as a vio device to receive callbacks */ | |
85 | rc = vio_register_driver(&hvc_vio_driver); | |
86 | ||
87 | return rc; | |
88 | } | |
89 | module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ | |
90 | ||
91 | static void hvc_vio_exit(void) | |
92 | { | |
93 | vio_unregister_driver(&hvc_vio_driver); | |
94 | } | |
95 | module_exit(hvc_vio_exit); | |
96 | ||
97 | /* the device tree order defines our numbering */ | |
98 | static int hvc_find_vtys(void) | |
99 | { | |
100 | struct device_node *vty; | |
101 | int num_found = 0; | |
102 | ||
103 | for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL; | |
104 | vty = of_find_node_by_name(vty, "vty")) { | |
105 | uint32_t *vtermno; | |
106 | ||
107 | /* We have statically defined space for only a certain number | |
108 | * of console adapters. | |
109 | */ | |
110 | if (num_found >= MAX_NR_HVC_CONSOLES) | |
111 | break; | |
112 | ||
113 | vtermno = (uint32_t *)get_property(vty, "reg", NULL); | |
114 | if (!vtermno) | |
115 | continue; | |
116 | ||
117 | if (device_is_compatible(vty, "hvterm1")) { | |
118 | hvc_instantiate(*vtermno, num_found); | |
119 | ++num_found; | |
120 | } | |
121 | } | |
122 | ||
123 | return num_found; | |
124 | } | |
125 | console_initcall(hvc_find_vtys); |