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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
25static DEFINE_MUTEX(update_lock);
26
27/*
28 * C2 port operations
29 */
30
31static 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-impedance */
45 outb(v & ~(C2D | C2CK), DIR_PORT);
46
47 mutex_unlock(&update_lock);
48}
49
50static 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
66static int duramar2150_c2port_c2d_get(struct c2port_device *dev)
67{
68 return inb(DATA_PORT) & C2D;
69}
70
71static 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
87static 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
103static 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
114static struct c2port_device *duramar2150_c2port_dev;
115
116/*
117 * Module stuff
118 */
119
120static 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
138free_region:
139 release_region(0x325, 2);
140 return ret;
141}
142
143static 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
153module_init(duramar2150_c2port_init);
154module_exit(duramar2150_c2port_exit);
155
156MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
157MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150");
158MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
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>
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>
15#include <linux/ioport.h>
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
23static DEFINE_MUTEX(update_lock);
24
25/*
26 * C2 port operations
27 */
28
29static 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
42 * as inputs or hi-impedance */
43 outb(v & ~(C2D | C2CK), DIR_PORT);
44
45 mutex_unlock(&update_lock);
46}
47
48static 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
64static int duramar2150_c2port_c2d_get(struct c2port_device *dev)
65{
66 return inb(DATA_PORT) & C2D;
67}
68
69static 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
85static 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
101static 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
112static struct c2port_device *duramar2150_c2port_dev;
113
114/*
115 * Module stuff
116 */
117
118static 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);
129 if (IS_ERR(duramar2150_c2port_dev)) {
130 ret = PTR_ERR(duramar2150_c2port_dev);
131 goto free_region;
132 }
133
134 return 0;
135
136free_region:
137 release_region(0x325, 2);
138 return ret;
139}
140
141static 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
151module_init(duramar2150_c2port_init);
152module_exit(duramar2150_c2port_exit);
153
154MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
155MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150");
156MODULE_LICENSE("GPL");