Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
65131cd5 RG |
2 | /* |
3 | * Silicon Labs C2 port Linux support for Eurotech Duramar 2150 | |
4 | * | |
5 | * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it> | |
6 | * Copyright (c) 2008 Eurotech S.p.A. <info@eurotech.it> | |
65131cd5 RG |
7 | */ |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/io.h> | |
ecd9d34a | 15 | #include <linux/ioport.h> |
65131cd5 RG |
16 | #include <linux/c2port.h> |
17 | ||
18 | #define DATA_PORT 0x325 | |
19 | #define DIR_PORT 0x326 | |
20 | #define C2D (1 << 0) | |
21 | #define C2CK (1 << 1) | |
22 | ||
23 | static DEFINE_MUTEX(update_lock); | |
24 | ||
25 | /* | |
26 | * C2 port operations | |
27 | */ | |
28 | ||
29 | static void duramar2150_c2port_access(struct c2port_device *dev, int status) | |
30 | { | |
31 | u8 v; | |
32 | ||
33 | mutex_lock(&update_lock); | |
34 | ||
35 | v = inb(DIR_PORT); | |
36 | ||
37 | /* 0 = input, 1 = output */ | |
38 | if (status) | |
39 | outb(v | (C2D | C2CK), DIR_PORT); | |
40 | else | |
41 | /* When access is "off" is important that both lines are set | |
25985edc | 42 | * as inputs or hi-impedance */ |
65131cd5 RG |
43 | outb(v & ~(C2D | C2CK), DIR_PORT); |
44 | ||
45 | mutex_unlock(&update_lock); | |
46 | } | |
47 | ||
48 | static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir) | |
49 | { | |
50 | u8 v; | |
51 | ||
52 | mutex_lock(&update_lock); | |
53 | ||
54 | v = inb(DIR_PORT); | |
55 | ||
56 | if (dir) | |
57 | outb(v & ~C2D, DIR_PORT); | |
58 | else | |
59 | outb(v | C2D, DIR_PORT); | |
60 | ||
61 | mutex_unlock(&update_lock); | |
62 | } | |
63 | ||
64 | static int duramar2150_c2port_c2d_get(struct c2port_device *dev) | |
65 | { | |
66 | return inb(DATA_PORT) & C2D; | |
67 | } | |
68 | ||
69 | static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status) | |
70 | { | |
71 | u8 v; | |
72 | ||
73 | mutex_lock(&update_lock); | |
74 | ||
75 | v = inb(DATA_PORT); | |
76 | ||
77 | if (status) | |
78 | outb(v | C2D, DATA_PORT); | |
79 | else | |
80 | outb(v & ~C2D, DATA_PORT); | |
81 | ||
82 | mutex_unlock(&update_lock); | |
83 | } | |
84 | ||
85 | static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status) | |
86 | { | |
87 | u8 v; | |
88 | ||
89 | mutex_lock(&update_lock); | |
90 | ||
91 | v = inb(DATA_PORT); | |
92 | ||
93 | if (status) | |
94 | outb(v | C2CK, DATA_PORT); | |
95 | else | |
96 | outb(v & ~C2CK, DATA_PORT); | |
97 | ||
98 | mutex_unlock(&update_lock); | |
99 | } | |
100 | ||
101 | static struct c2port_ops duramar2150_c2port_ops = { | |
102 | .block_size = 512, /* bytes */ | |
103 | .blocks_num = 30, /* total flash size: 15360 bytes */ | |
104 | ||
105 | .access = duramar2150_c2port_access, | |
106 | .c2d_dir = duramar2150_c2port_c2d_dir, | |
107 | .c2d_get = duramar2150_c2port_c2d_get, | |
108 | .c2d_set = duramar2150_c2port_c2d_set, | |
109 | .c2ck_set = duramar2150_c2port_c2ck_set, | |
110 | }; | |
111 | ||
112 | static struct c2port_device *duramar2150_c2port_dev; | |
113 | ||
114 | /* | |
115 | * Module stuff | |
116 | */ | |
117 | ||
118 | static int __init duramar2150_c2port_init(void) | |
119 | { | |
120 | struct resource *res; | |
121 | int ret = 0; | |
122 | ||
123 | res = request_region(0x325, 2, "c2port"); | |
124 | if (!res) | |
125 | return -EBUSY; | |
126 | ||
127 | duramar2150_c2port_dev = c2port_device_register("uc", | |
128 | &duramar2150_c2port_ops, NULL); | |
8128a31e DC |
129 | if (IS_ERR(duramar2150_c2port_dev)) { |
130 | ret = PTR_ERR(duramar2150_c2port_dev); | |
65131cd5 RG |
131 | goto free_region; |
132 | } | |
133 | ||
134 | return 0; | |
135 | ||
136 | free_region: | |
137 | release_region(0x325, 2); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static void __exit duramar2150_c2port_exit(void) | |
142 | { | |
143 | /* Setup the GPIOs as input by default (access = 0) */ | |
144 | duramar2150_c2port_access(duramar2150_c2port_dev, 0); | |
145 | ||
146 | c2port_device_unregister(duramar2150_c2port_dev); | |
147 | ||
148 | release_region(0x325, 2); | |
149 | } | |
150 | ||
151 | module_init(duramar2150_c2port_init); | |
152 | module_exit(duramar2150_c2port_exit); | |
153 | ||
154 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
155 | MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150"); | |
156 | MODULE_LICENSE("GPL"); |