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
|
/*
* SD card bus interface code.
*
* Copyright (c) 2015 Linaro Limited
*
* Author:
* Peter Maydell <peter.maydell@linaro.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/qdev-core.h"
#include "sysemu/block-backend.h"
#include "hw/sd/sd.h"
#include "trace.h"
static inline const char *sdbus_name(SDBus *sdbus)
{
return sdbus->qbus.name;
}
static SDState *get_card(SDBus *sdbus)
{
/* We only ever have one child on the bus so just return it */
BusChild *kid = QTAILQ_FIRST(&sdbus->qbus.children);
if (!kid) {
return NULL;
}
return SD_CARD(kid->child);
}
uint8_t sdbus_get_dat_lines(SDBus *sdbus)
{
SDState *slave = get_card(sdbus);
uint8_t dat_lines = 0b1111; /* 4 bit bus width */
if (slave) {
SDCardClass *sc = SD_CARD_GET_CLASS(slave);
if (sc->get_dat_lines) {
dat_lines = sc->get_dat_lines(slave);
}
}
trace_sdbus_get_dat_lines(sdbus_name(sdbus), dat_lines);
return dat_lines;
}
bool sdbus_get_cmd_line(SDBus *sdbus)
{
SDState *slave = get_card(sdbus);
bool cmd_line = true;
if (slave) {
SDCardClass *sc = SD_CARD_GET_CLASS(slave);
if (sc->get_cmd_line) {
cmd_line = sc->get_cmd_line(slave);
}
}
trace_sdbus_get_cmd_line(sdbus_name(sdbus), cmd_line);
return cmd_line;
}
void sdbus_set_voltage(SDBus *sdbus, uint16_t millivolts)
{
SDState *card = get_card(sdbus);
trace_sdbus_set_voltage(sdbus_name(sdbus), millivolts);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
assert(sc->set_voltage);
sc->set_voltage(card, millivolts);
}
}
int sdbus_do_command(SDBus *sdbus, SDRequest *req, uint8_t *response)
{
SDState *card = get_card(sdbus);
trace_sdbus_command(sdbus_name(sdbus), req->cmd, req->arg, req->crc);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->do_command(card, req, response);
}
return 0;
}
void sdbus_write_data(SDBus *sdbus, uint8_t value)
{
SDState *card = get_card(sdbus);
trace_sdbus_write(sdbus_name(sdbus), value);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
sc->write_data(card, value);
}
}
uint8_t sdbus_read_data(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
uint8_t value = 0;
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
value = sc->read_data(card);
}
trace_sdbus_read(sdbus_name(sdbus), value);
return value;
}
bool sdbus_data_ready(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->data_ready(card);
}
return false;
}
bool sdbus_get_inserted(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->get_inserted(card);
}
return false;
}
bool sdbus_get_readonly(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->get_readonly(card);
}
return false;
}
void sdbus_set_inserted(SDBus *sdbus, bool inserted)
{
SDBusClass *sbc = SD_BUS_GET_CLASS(sdbus);
BusState *qbus = BUS(sdbus);
if (sbc->set_inserted) {
sbc->set_inserted(qbus->parent, inserted);
}
}
void sdbus_set_readonly(SDBus *sdbus, bool readonly)
{
SDBusClass *sbc = SD_BUS_GET_CLASS(sdbus);
BusState *qbus = BUS(sdbus);
if (sbc->set_readonly) {
sbc->set_readonly(qbus->parent, readonly);
}
}
void sdbus_reparent_card(SDBus *from, SDBus *to)
{
SDState *card = get_card(from);
SDCardClass *sc;
bool readonly;
/* We directly reparent the card object rather than implementing this
* as a hotpluggable connection because we don't want to expose SD cards
* to users as being hotpluggable, and we can get away with it in this
* limited use case. This could perhaps be implemented more cleanly in
* future by adding support to the hotplug infrastructure for "device
* can be hotplugged only via code, not by user".
*/
if (!card) {
return;
}
sc = SD_CARD_GET_CLASS(card);
readonly = sc->get_readonly(card);
sdbus_set_inserted(from, false);
qdev_set_parent_bus(DEVICE(card), &to->qbus);
sdbus_set_inserted(to, true);
sdbus_set_readonly(to, readonly);
}
static const TypeInfo sd_bus_info = {
.name = TYPE_SD_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SDBus),
.class_size = sizeof(SDBusClass),
};
static void sd_bus_register_types(void)
{
type_register_static(&sd_bus_info);
}
type_init(sd_bus_register_types)
|
