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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Sky Nexus Register Driver
3 *
4 * Copyright (C) 2002 Brian Waite
5 *
6 * This driver allows reading the Nexus register
7 * It exports the /proc/sky_chassis_id and also
8 * /proc/sky_slot_id pseudo-file for status information.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 */
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/proc_fs.h>
20#include <linux/hdpu_features.h>
21#include <linux/pci.h>
22
Russell Kingd052d1b2005-10-29 19:07:23 +010023#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Russell King3ae5eae2005-11-09 22:32:44 +000025static int hdpu_nexus_probe(struct platform_device *pdev);
26static int hdpu_nexus_remove(struct platform_device *pdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28static struct proc_dir_entry *hdpu_slot_id;
29static struct proc_dir_entry *hdpu_chassis_id;
30static int slot_id = -1;
31static int chassis_id = -1;
32
Russell King3ae5eae2005-11-09 22:32:44 +000033static struct platform_driver hdpu_nexus_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 .probe = hdpu_nexus_probe,
35 .remove = hdpu_nexus_remove,
Russell King3ae5eae2005-11-09 22:32:44 +000036 .driver = {
37 .name = HDPU_NEXUS_NAME,
38 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070039};
40
41int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset,
42 int buffer_length, int *zero, void *ptr)
43{
44
45 if (offset > 0)
46 return 0;
47 return sprintf(buffer, "%d\n", slot_id);
48}
49
50int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset,
51 int buffer_length, int *zero, void *ptr)
52{
53
54 if (offset > 0)
55 return 0;
56 return sprintf(buffer, "%d\n", chassis_id);
57}
58
Russell King3ae5eae2005-11-09 22:32:44 +000059static int hdpu_nexus_probe(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 struct resource *res;
62
63 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
64 int *nexus_id_addr;
65 nexus_id_addr =
66 ioremap(res->start, (unsigned long)(res->end - res->start));
67 if (nexus_id_addr) {
68 slot_id = (*nexus_id_addr >> 8) & 0x1f;
69 chassis_id = *nexus_id_addr & 0xff;
70 iounmap(nexus_id_addr);
71 } else
72 printk("Could not map slot id\n");
73 hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
74 hdpu_slot_id->read_proc = hdpu_slot_id_read;
75 hdpu_slot_id->nlink = 1;
76
77 hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
78 hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
79 hdpu_chassis_id->nlink = 1;
80 return 0;
81}
82
Russell King3ae5eae2005-11-09 22:32:44 +000083static int hdpu_nexus_remove(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 slot_id = -1;
86 chassis_id = -1;
87 remove_proc_entry("sky_slot_id", &proc_root);
88 remove_proc_entry("sky_chassis_id", &proc_root);
89 hdpu_slot_id = 0;
90 hdpu_chassis_id = 0;
91 return 0;
92}
93
94static int __init nexus_init(void)
95{
96 int rc;
Russell King3ae5eae2005-11-09 22:32:44 +000097 rc = platform_driver_register(&hdpu_nexus_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 return rc;
99}
100
101static void __exit nexus_exit(void)
102{
Russell King3ae5eae2005-11-09 22:32:44 +0000103 platform_driver_unregister(&hdpu_nexus_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106module_init(nexus_init);
107module_exit(nexus_exit);
108
109MODULE_AUTHOR("Brian Waite");
110MODULE_LICENSE("GPL");