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65131cd5 RG |
1 | /* |
2 | * Silicon Labs C2 port Linux support for Eurotech Duramar 2150 | |
3 | * | |
4 | * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it> | |
5 | * Copyright (c) 2008 Eurotech S.p.A. <info@eurotech.it> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published by | |
9 | * the Free Software Foundation | |
10 | */ | |
11 | ||
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/c2port.h> | |
19 | ||
20 | #define DATA_PORT 0x325 | |
21 | #define DIR_PORT 0x326 | |
22 | #define C2D (1 << 0) | |
23 | #define C2CK (1 << 1) | |
24 | ||
25 | static DEFINE_MUTEX(update_lock); | |
26 | ||
27 | /* | |
28 | * C2 port operations | |
29 | */ | |
30 | ||
31 | static void duramar2150_c2port_access(struct c2port_device *dev, int status) | |
32 | { | |
33 | u8 v; | |
34 | ||
35 | mutex_lock(&update_lock); | |
36 | ||
37 | v = inb(DIR_PORT); | |
38 | ||
39 | /* 0 = input, 1 = output */ | |
40 | if (status) | |
41 | outb(v | (C2D | C2CK), DIR_PORT); | |
42 | else | |
43 | /* When access is "off" is important that both lines are set | |
44 | * as inputs or hi-impedence */ | |
45 | outb(v & ~(C2D | C2CK), DIR_PORT); | |
46 | ||
47 | mutex_unlock(&update_lock); | |
48 | } | |
49 | ||
50 | static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir) | |
51 | { | |
52 | u8 v; | |
53 | ||
54 | mutex_lock(&update_lock); | |
55 | ||
56 | v = inb(DIR_PORT); | |
57 | ||
58 | if (dir) | |
59 | outb(v & ~C2D, DIR_PORT); | |
60 | else | |
61 | outb(v | C2D, DIR_PORT); | |
62 | ||
63 | mutex_unlock(&update_lock); | |
64 | } | |
65 | ||
66 | static int duramar2150_c2port_c2d_get(struct c2port_device *dev) | |
67 | { | |
68 | return inb(DATA_PORT) & C2D; | |
69 | } | |
70 | ||
71 | static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status) | |
72 | { | |
73 | u8 v; | |
74 | ||
75 | mutex_lock(&update_lock); | |
76 | ||
77 | v = inb(DATA_PORT); | |
78 | ||
79 | if (status) | |
80 | outb(v | C2D, DATA_PORT); | |
81 | else | |
82 | outb(v & ~C2D, DATA_PORT); | |
83 | ||
84 | mutex_unlock(&update_lock); | |
85 | } | |
86 | ||
87 | static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status) | |
88 | { | |
89 | u8 v; | |
90 | ||
91 | mutex_lock(&update_lock); | |
92 | ||
93 | v = inb(DATA_PORT); | |
94 | ||
95 | if (status) | |
96 | outb(v | C2CK, DATA_PORT); | |
97 | else | |
98 | outb(v & ~C2CK, DATA_PORT); | |
99 | ||
100 | mutex_unlock(&update_lock); | |
101 | } | |
102 | ||
103 | static struct c2port_ops duramar2150_c2port_ops = { | |
104 | .block_size = 512, /* bytes */ | |
105 | .blocks_num = 30, /* total flash size: 15360 bytes */ | |
106 | ||
107 | .access = duramar2150_c2port_access, | |
108 | .c2d_dir = duramar2150_c2port_c2d_dir, | |
109 | .c2d_get = duramar2150_c2port_c2d_get, | |
110 | .c2d_set = duramar2150_c2port_c2d_set, | |
111 | .c2ck_set = duramar2150_c2port_c2ck_set, | |
112 | }; | |
113 | ||
114 | static struct c2port_device *duramar2150_c2port_dev; | |
115 | ||
116 | /* | |
117 | * Module stuff | |
118 | */ | |
119 | ||
120 | static int __init duramar2150_c2port_init(void) | |
121 | { | |
122 | struct resource *res; | |
123 | int ret = 0; | |
124 | ||
125 | res = request_region(0x325, 2, "c2port"); | |
126 | if (!res) | |
127 | return -EBUSY; | |
128 | ||
129 | duramar2150_c2port_dev = c2port_device_register("uc", | |
130 | &duramar2150_c2port_ops, NULL); | |
131 | if (!duramar2150_c2port_dev) { | |
132 | ret = -ENODEV; | |
133 | goto free_region; | |
134 | } | |
135 | ||
136 | return 0; | |
137 | ||
138 | free_region: | |
139 | release_region(0x325, 2); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static void __exit duramar2150_c2port_exit(void) | |
144 | { | |
145 | /* Setup the GPIOs as input by default (access = 0) */ | |
146 | duramar2150_c2port_access(duramar2150_c2port_dev, 0); | |
147 | ||
148 | c2port_device_unregister(duramar2150_c2port_dev); | |
149 | ||
150 | release_region(0x325, 2); | |
151 | } | |
152 | ||
153 | module_init(duramar2150_c2port_init); | |
154 | module_exit(duramar2150_c2port_exit); | |
155 | ||
156 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
157 | MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150"); | |
158 | MODULE_LICENSE("GPL"); |