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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");
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/ioport.h>
19#include <linux/c2port.h>
20
21#define DATA_PORT 0x325
22#define DIR_PORT 0x326
23#define C2D (1 << 0)
24#define C2CK (1 << 1)
25
26static DEFINE_MUTEX(update_lock);
27
28/*
29 * C2 port operations
30 */
31
32static void duramar2150_c2port_access(struct c2port_device *dev, int status)
33{
34 u8 v;
35
36 mutex_lock(&update_lock);
37
38 v = inb(DIR_PORT);
39
40 /* 0 = input, 1 = output */
41 if (status)
42 outb(v | (C2D | C2CK), DIR_PORT);
43 else
44 /* When access is "off" is important that both lines are set
45 * as inputs or hi-impedance */
46 outb(v & ~(C2D | C2CK), DIR_PORT);
47
48 mutex_unlock(&update_lock);
49}
50
51static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir)
52{
53 u8 v;
54
55 mutex_lock(&update_lock);
56
57 v = inb(DIR_PORT);
58
59 if (dir)
60 outb(v & ~C2D, DIR_PORT);
61 else
62 outb(v | C2D, DIR_PORT);
63
64 mutex_unlock(&update_lock);
65}
66
67static int duramar2150_c2port_c2d_get(struct c2port_device *dev)
68{
69 return inb(DATA_PORT) & C2D;
70}
71
72static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status)
73{
74 u8 v;
75
76 mutex_lock(&update_lock);
77
78 v = inb(DATA_PORT);
79
80 if (status)
81 outb(v | C2D, DATA_PORT);
82 else
83 outb(v & ~C2D, DATA_PORT);
84
85 mutex_unlock(&update_lock);
86}
87
88static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status)
89{
90 u8 v;
91
92 mutex_lock(&update_lock);
93
94 v = inb(DATA_PORT);
95
96 if (status)
97 outb(v | C2CK, DATA_PORT);
98 else
99 outb(v & ~C2CK, DATA_PORT);
100
101 mutex_unlock(&update_lock);
102}
103
104static struct c2port_ops duramar2150_c2port_ops = {
105 .block_size = 512, /* bytes */
106 .blocks_num = 30, /* total flash size: 15360 bytes */
107
108 .access = duramar2150_c2port_access,
109 .c2d_dir = duramar2150_c2port_c2d_dir,
110 .c2d_get = duramar2150_c2port_c2d_get,
111 .c2d_set = duramar2150_c2port_c2d_set,
112 .c2ck_set = duramar2150_c2port_c2ck_set,
113};
114
115static struct c2port_device *duramar2150_c2port_dev;
116
117/*
118 * Module stuff
119 */
120
121static int __init duramar2150_c2port_init(void)
122{
123 struct resource *res;
124 int ret = 0;
125
126 res = request_region(0x325, 2, "c2port");
127 if (!res)
128 return -EBUSY;
129
130 duramar2150_c2port_dev = c2port_device_register("uc",
131 &duramar2150_c2port_ops, NULL);
132 if (!duramar2150_c2port_dev) {
133 ret = -ENODEV;
134 goto free_region;
135 }
136
137 return 0;
138
139free_region:
140 release_region(0x325, 2);
141 return ret;
142}
143
144static void __exit duramar2150_c2port_exit(void)
145{
146 /* Setup the GPIOs as input by default (access = 0) */
147 duramar2150_c2port_access(duramar2150_c2port_dev, 0);
148
149 c2port_device_unregister(duramar2150_c2port_dev);
150
151 release_region(0x325, 2);
152}
153
154module_init(duramar2150_c2port_init);
155module_exit(duramar2150_c2port_exit);
156
157MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
158MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150");
159MODULE_LICENSE("GPL");