1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
Mantis PCI bridge driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
*/
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/dvb_net.h>
#include "mantis_common.h"
#include "mantis_reg.h"
#include "mantis_i2c.h"
#define TRIALS 10000
static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg)
{
u32 rxd, i, stat, trials;
dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
__func__, msg->addr);
for (i = 0; i < msg->len; i++) {
rxd = (msg->addr << 25) | (1 << 24)
| MANTIS_I2C_RATE_3
| MANTIS_I2C_STOP
| MANTIS_I2C_PGMODE;
if (i == (msg->len - 1))
rxd &= ~MANTIS_I2C_STOP;
mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
mmwrite(rxd, MANTIS_I2CDATA_CTL);
/* wait for xfer completion */
for (trials = 0; trials < TRIALS; trials++) {
stat = mmread(MANTIS_INT_STAT);
if (stat & MANTIS_INT_I2CDONE)
break;
}
dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
/* wait for xfer completion */
for (trials = 0; trials < TRIALS; trials++) {
stat = mmread(MANTIS_INT_STAT);
if (stat & MANTIS_INT_I2CRACK)
break;
}
dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
rxd = mmread(MANTIS_I2CDATA_CTL);
msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
}
dprintk(MANTIS_INFO, 0, "]\n");
return 0;
}
static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg)
{
int i;
u32 txd = 0, stat, trials;
dprintk(MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
__func__, msg->addr);
for (i = 0; i < msg->len; i++) {
dprintk(MANTIS_INFO, 0, "%02x ", msg->buf[i]);
txd = (msg->addr << 25) | (msg->buf[i] << 8)
| MANTIS_I2C_RATE_3
| MANTIS_I2C_STOP
| MANTIS_I2C_PGMODE;
if (i == (msg->len - 1))
txd &= ~MANTIS_I2C_STOP;
mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
mmwrite(txd, MANTIS_I2CDATA_CTL);
/* wait for xfer completion */
for (trials = 0; trials < TRIALS; trials++) {
stat = mmread(MANTIS_INT_STAT);
if (stat & MANTIS_INT_I2CDONE)
break;
}
dprintk(MANTIS_TMG, 0, "I2CDONE: trials=%d\n", trials);
/* wait for xfer completion */
for (trials = 0; trials < TRIALS; trials++) {
stat = mmread(MANTIS_INT_STAT);
if (stat & MANTIS_INT_I2CRACK)
break;
}
dprintk(MANTIS_TMG, 0, "I2CRACK: trials=%d\n", trials);
}
dprintk(MANTIS_INFO, 0, "]\n");
return 0;
}
static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
{
int ret = 0, i = 0, trials;
u32 stat, data, txd;
struct mantis_pci *mantis;
struct mantis_hwconfig *config;
mantis = i2c_get_adapdata(adapter);
BUG_ON(!mantis);
config = mantis->hwconfig;
BUG_ON(!config);
dprintk(MANTIS_DEBUG, 1, "Messages:%d", num);
mutex_lock(&mantis->i2c_lock);
while (i < num) {
/* Byte MODE */
if ((config->i2c_mode & MANTIS_BYTE_MODE) &&
((i + 1) < num) &&
(msgs[i].len < 2) &&
(msgs[i + 1].len < 2) &&
(msgs[i + 1].flags & I2C_M_RD)) {
dprintk(MANTIS_DEBUG, 0, " Byte MODE:\n");
/* Read operation */
txd = msgs[i].addr << 25 | (0x1 << 24)
| (msgs[i].buf[0] << 16)
| MANTIS_I2C_RATE_3;
mmwrite(txd, MANTIS_I2CDATA_CTL);
/* wait for xfer completion */
for (trials = 0; trials < TRIALS; trials++) {
stat = mmread(MANTIS_INT_STAT);
if (stat & MANTIS_INT_I2CDONE)
break;
}
/* check for xfer completion */
if (stat & MANTIS_INT_I2CDONE) {
/* check xfer was acknowledged */
if (stat & MANTIS_INT_I2CRACK) {
data = mmread(MANTIS_I2CDATA_CTL);
msgs[i + 1].buf[0] = (data >> 8) & 0xff;
dprintk(MANTIS_DEBUG, 0, " Byte <%d> RXD=0x%02x [%02x]\n", 0x0, data, msgs[i + 1].buf[0]);
} else {
/* I/O error */
dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
ret = -EIO;
break;
}
} else {
/* I/O error */
dprintk(MANTIS_ERROR, 1, " I/O error, LINE:%d", __LINE__);
ret = -EIO;
break;
}
i += 2; /* Write/Read operation in one go */
}
if (i < num) {
if (msgs[i].flags & I2C_M_RD)
ret = mantis_i2c_read(mantis, &msgs[i]);
else
ret = mantis_i2c_write(mantis, &msgs[i]);
i++;
if (ret < 0)
goto bail_out;
}
}
mutex_unlock(&mantis->i2c_lock);
return num;
bail_out:
mutex_unlock(&mantis->i2c_lock);
return ret;
}
static u32 mantis_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm mantis_algo = {
.master_xfer = mantis_i2c_xfer,
.functionality = mantis_i2c_func,
};
int mantis_i2c_init(struct mantis_pci *mantis)
{
u32 intstat;
struct i2c_adapter *i2c_adapter = &mantis->adapter;
struct pci_dev *pdev = mantis->pdev;
init_waitqueue_head(&mantis->i2c_wq);
mutex_init(&mantis->i2c_lock);
strscpy(i2c_adapter->name, "Mantis I2C", sizeof(i2c_adapter->name));
i2c_set_adapdata(i2c_adapter, mantis);
i2c_adapter->owner = THIS_MODULE;
i2c_adapter->algo = &mantis_algo;
i2c_adapter->algo_data = NULL;
i2c_adapter->timeout = 500;
i2c_adapter->retries = 3;
i2c_adapter->dev.parent = &pdev->dev;
mantis->i2c_rc = i2c_add_adapter(i2c_adapter);
if (mantis->i2c_rc < 0)
return mantis->i2c_rc;
dprintk(MANTIS_DEBUG, 1, "Initializing I2C ..");
intstat = mmread(MANTIS_INT_STAT);
mmread(MANTIS_INT_MASK);
mmwrite(intstat, MANTIS_INT_STAT);
dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
return 0;
}
EXPORT_SYMBOL_GPL(mantis_i2c_init);
int mantis_i2c_exit(struct mantis_pci *mantis)
{
dprintk(MANTIS_DEBUG, 1, "Disabling I2C interrupt");
mantis_mask_ints(mantis, MANTIS_INT_I2CDONE);
dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
i2c_del_adapter(&mantis->adapter);
return 0;
}
EXPORT_SYMBOL_GPL(mantis_i2c_exit);
|
