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
|
/*
* Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
*
* Original author:
* Ben Collins <bcollins@ubuntu.com>
*
* Additional work by:
* John Brooks <john.brooks@bluecherry.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include "solo6x10.h"
/* Control */
#define EE_SHIFT_CLK 0x04
#define EE_CS 0x08
#define EE_DATA_WRITE 0x02
#define EE_DATA_READ 0x01
#define EE_ENB (0x80 | EE_CS)
#define eeprom_delay() udelay(100)
#if 0
#define eeprom_delay() solo_reg_read(solo_dev, SOLO_EEPROM_CTRL)
#define eeprom_delay() ({ \
int i, ret; \
udelay(100); \
for (i = ret = 0; i < 1000 && !ret; i++) \
ret = solo_eeprom_reg_read(solo_dev); \
})
#endif
#define ADDR_LEN 6
/* Commands */
#define EE_EWEN_CMD 4
#define EE_EWDS_CMD 4
#define EE_WRITE_CMD 5
#define EE_READ_CMD 6
#define EE_ERASE_CMD 7
static unsigned int solo_eeprom_reg_read(struct solo_dev *solo_dev)
{
return solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) & EE_DATA_READ;
}
static void solo_eeprom_reg_write(struct solo_dev *solo_dev, u32 data)
{
solo_reg_write(solo_dev, SOLO_EEPROM_CTRL, data);
eeprom_delay();
}
static void solo_eeprom_cmd(struct solo_dev *solo_dev, int cmd)
{
int i;
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ACCESS_EN);
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
for (i = 4 + ADDR_LEN; i >= 0; i--) {
int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0;
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | dataval);
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
EE_SHIFT_CLK | dataval);
}
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
}
unsigned int solo_eeprom_ewen(struct solo_dev *solo_dev, int w_en)
{
int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN);
unsigned int retval = 0;
int i;
solo_eeprom_cmd(solo_dev, ewen_cmd);
for (i = 0; i < 16; i++) {
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
EE_SHIFT_CLK);
retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
}
solo_eeprom_reg_write(solo_dev, ~EE_CS);
retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
return retval;
}
unsigned short solo_eeprom_read(struct solo_dev *solo_dev, int loc)
{
int read_cmd = loc | (EE_READ_CMD << ADDR_LEN);
unsigned short retval = 0;
int i;
solo_eeprom_cmd(solo_dev, read_cmd);
for (i = 0; i < 16; i++) {
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE |
EE_SHIFT_CLK);
retval = (retval << 1) | solo_eeprom_reg_read(solo_dev);
solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE);
}
solo_eeprom_reg_write(solo_dev, ~EE_CS);
return retval;
}
int solo_eeprom_write(struct solo_dev *solo_dev, int loc,
unsigned short data)
{
int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN);
unsigned int retval;
int i;
solo_eeprom_cmd(solo_dev, write_cmd);
for (i = 15; i >= 0; i--) {
unsigned int dataval = (data >> i) & 1;
solo_eeprom_reg_write(solo_dev, EE_ENB);
solo_eeprom_reg_write(solo_dev,
EE_ENB | (dataval << 1) | EE_SHIFT_CLK);
}
solo_eeprom_reg_write(solo_dev, EE_ENB);
solo_eeprom_reg_write(solo_dev, ~EE_CS);
solo_eeprom_reg_write(solo_dev, EE_ENB);
for (i = retval = 0; i < 10000 && !retval; i++)
retval = solo_eeprom_reg_read(solo_dev);
solo_eeprom_reg_write(solo_dev, ~EE_CS);
return !retval;
}
|
