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
|
/*
* MAX7310 8-port GPIO expansion chip.
*
* Copyright (c) 2006 Openedhand Ltd.
* Written by Andrzej Zaborowski <balrog@zabor.org>
*
* This file is licensed under GNU GPL.
*/
#include "hw.h"
#include "i2c.h"
struct max7310_s {
i2c_slave i2c;
int i2c_command_byte;
int len;
uint8_t level;
uint8_t direction;
uint8_t polarity;
uint8_t status;
uint8_t command;
qemu_irq handler[8];
qemu_irq *gpio_in;
};
void max7310_reset(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
s->level &= s->direction;
s->direction = 0xff;
s->polarity = 0xf0;
s->status = 0x01;
s->command = 0x00;
}
static int max7310_rx(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
switch (s->command) {
case 0x00: /* Input port */
return s->level ^ s->polarity;
break;
case 0x01: /* Output port */
return s->level & ~s->direction;
break;
case 0x02: /* Polarity inversion */
return s->polarity;
case 0x03: /* Configuration */
return s->direction;
case 0x04: /* Timeout */
return s->status;
break;
case 0xff: /* Reserved */
return 0xff;
default:
#ifdef VERBOSE
printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
#endif
break;
}
return 0xff;
}
static int max7310_tx(i2c_slave *i2c, uint8_t data)
{
struct max7310_s *s = (struct max7310_s *) i2c;
uint8_t diff;
int line;
if (s->len ++ > 1) {
#ifdef VERBOSE
printf("%s: message too long (%i bytes)\n", __FUNCTION__, s->len);
#endif
return 1;
}
if (s->i2c_command_byte) {
s->command = data;
s->i2c_command_byte = 0;
return 0;
}
switch (s->command) {
case 0x01: /* Output port */
for (diff = (data ^ s->level) & ~s->direction; diff;
diff &= ~(1 << line)) {
line = ffs(diff) - 1;
if (s->handler[line])
qemu_set_irq(s->handler[line], (data >> line) & 1);
}
s->level = (s->level & s->direction) | (data & ~s->direction);
break;
case 0x02: /* Polarity inversion */
s->polarity = data;
break;
case 0x03: /* Configuration */
s->level &= ~(s->direction ^ data);
s->direction = data;
break;
case 0x04: /* Timeout */
s->status = data;
break;
case 0x00: /* Input port - ignore writes */
break;
default:
#ifdef VERBOSE
printf("%s: unknown register %02x\n", __FUNCTION__, s->command);
#endif
return 1;
}
return 0;
}
static void max7310_event(i2c_slave *i2c, enum i2c_event event)
{
struct max7310_s *s = (struct max7310_s *) i2c;
s->len = 0;
switch (event) {
case I2C_START_SEND:
s->i2c_command_byte = 1;
break;
case I2C_FINISH:
#ifdef VERBOSE
if (s->len == 1)
printf("%s: message too short (%i bytes)\n", __FUNCTION__, s->len);
#endif
break;
default:
break;
}
}
static void max7310_save(QEMUFile *f, void *opaque)
{
struct max7310_s *s = (struct max7310_s *) opaque;
qemu_put_be32(f, s->i2c_command_byte);
qemu_put_be32(f, s->len);
qemu_put_8s(f, &s->level);
qemu_put_8s(f, &s->direction);
qemu_put_8s(f, &s->polarity);
qemu_put_8s(f, &s->status);
qemu_put_8s(f, &s->command);
i2c_slave_save(f, &s->i2c);
}
static int max7310_load(QEMUFile *f, void *opaque, int version_id)
{
struct max7310_s *s = (struct max7310_s *) opaque;
s->i2c_command_byte = qemu_get_be32(f);
s->len = qemu_get_be32(f);
qemu_get_8s(f, &s->level);
qemu_get_8s(f, &s->direction);
qemu_get_8s(f, &s->polarity);
qemu_get_8s(f, &s->status);
qemu_get_8s(f, &s->command);
i2c_slave_load(f, &s->i2c);
return 0;
}
static void max7310_gpio_set(void *opaque, int line, int level)
{
struct max7310_s *s = (struct max7310_s *) opaque;
if (line >= sizeof(s->handler) / sizeof(*s->handler) || line < 0)
hw_error("bad GPIO line");
if (level)
s->level |= s->direction & (1 << line);
else
s->level &= ~(s->direction & (1 << line));
}
/* MAX7310 is SMBus-compatible (can be used with only SMBus protocols),
* but also accepts sequences that are not SMBus so return an I2C device. */
struct i2c_slave *max7310_init(i2c_bus *bus)
{
struct max7310_s *s = (struct max7310_s *)
i2c_slave_init(bus, 0, sizeof(struct max7310_s));
s->i2c.event = max7310_event;
s->i2c.recv = max7310_rx;
s->i2c.send = max7310_tx;
s->gpio_in = qemu_allocate_irqs(max7310_gpio_set, s,
sizeof(s->handler) / sizeof(*s->handler));
max7310_reset(&s->i2c);
register_savevm("max7310", -1, 0, max7310_save, max7310_load, s);
return &s->i2c;
}
qemu_irq *max7310_gpio_in_get(i2c_slave *i2c)
{
struct max7310_s *s = (struct max7310_s *) i2c;
return s->gpio_in;
}
void max7310_gpio_out_set(i2c_slave *i2c, int line, qemu_irq handler)
{
struct max7310_s *s = (struct max7310_s *) i2c;
if (line >= sizeof(s->handler) / sizeof(*s->handler) || line < 0)
hw_error("bad GPIO line");
s->handler[line] = handler;
}
|
