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
253
254
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* MultiMediaCard (MMC), eMMC and Secure Digital (SD) common initialization
* code which brings the card into the standby state. This code is controller
* independent.
*/
#include <commonlib/storage.h>
#include <delay.h>
#include <endian.h>
#include <string.h>
#include "mmc.h"
#include "sd_mmc.h"
#include "storage.h"
uint64_t sd_mmc_extract_uint32_bits(const uint32_t *array, int start, int count)
{
int i;
uint64_t value = 0;
for (i = 0; i < count; i++, start++) {
value <<= 1;
value |= (array[start / 32] >> (31 - (start % 32))) & 0x1;
}
return value;
}
static uint32_t sd_mmc_calculate_transfer_speed(uint32_t csd0)
{
uint32_t mult, freq;
/* frequency bases, divided by 10 to be nice to platforms without
* floating point */
static const int fbase[] = {
10000,
100000,
1000000,
10000000,
};
/* Multiplier values for TRAN_SPEED. Multiplied by 10 to be nice
* to platforms without floating point. */
static const int multipliers[] = {
0, // reserved
10,
12,
13,
15,
20,
25,
30,
35,
40,
45,
50,
55,
60,
70,
80,
};
/* divide frequency by 10, since the mults are 10x bigger */
freq = fbase[csd0 & 0x7];
mult = multipliers[(csd0 >> 3) & 0xf];
return freq * mult;
}
int sd_mmc_go_idle(struct storage_media *media)
{
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
// Some cards can't accept idle commands without delay.
if (ctrlr->mdelay_before_cmd0)
mdelay(ctrlr->mdelay_before_cmd0);
struct mmc_command cmd;
cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;
cmd.cmdarg = 0;
cmd.resp_type = CARD_RSP_NONE;
cmd.flags = 0;
int err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
// Some cards need more than half second to respond to next command (ex,
// SEND_OP_COND).
if (ctrlr->mdelay_after_cmd0)
mdelay(ctrlr->mdelay_after_cmd0);
return 0;
}
int sd_mmc_send_status(struct storage_media *media, ssize_t tries)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
cmd.cmdidx = MMC_CMD_SEND_STATUS;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
while (tries--) {
int err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
else if (cmd.response[0] & MMC_STATUS_RDY_FOR_DATA)
break;
else if (cmd.response[0] & MMC_STATUS_MASK) {
sd_mmc_error("Status Error: %#8.8x\n", cmd.response[0]);
return CARD_COMM_ERR;
}
udelay(100);
}
sd_mmc_trace("CURR STATE:%d\n",
(cmd.response[0] & MMC_STATUS_CURR_STATE) >> 9);
if (tries < 0) {
sd_mmc_error("Timeout waiting card ready\n");
return CARD_TIMEOUT;
}
return 0;
}
int sd_mmc_set_blocklen(struct sd_mmc_ctrlr *ctrlr, int len)
{
struct mmc_command cmd;
cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = len;
cmd.flags = 0;
return ctrlr->send_cmd(ctrlr, &cmd, NULL);
}
int sd_mmc_enter_standby(struct storage_media *media)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
int err;
SET_BUS_WIDTH(ctrlr, 1);
SET_CLOCK(ctrlr, 1);
/* Reset the Card */
err = sd_mmc_go_idle(media);
if (err)
return err;
/* Test for SD version 2 */
err = CARD_TIMEOUT;
if (CONFIG(COMMONLIB_STORAGE_SD)) {
err = sd_send_if_cond(media);
/* Get SD card operating condition */
if (!err)
err = sd_send_op_cond(media);
}
/* If the command timed out, we check for an MMC card */
if (CONFIG(COMMONLIB_STORAGE_MMC) && (err == CARD_TIMEOUT)) {
/* Some cards seem to need this */
sd_mmc_go_idle(media);
err = mmc_send_op_cond(media);
if (err == CARD_IN_PROGRESS)
err = mmc_complete_op_cond(media);
}
if (err) {
sd_mmc_error(
"Card did not respond to voltage select!\n");
return CARD_UNUSABLE_ERR;
}
/* Put the Card in Identify Mode */
cmd.cmdidx = MMC_CMD_ALL_SEND_CID;
cmd.resp_type = CARD_RSP_R2;
cmd.cmdarg = 0;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
memcpy(media->cid, cmd.response, sizeof(media->cid));
/*
* For MMC cards, set the Relative Address.
* For SD cards, get the Relative Address.
* This also puts the cards into Standby State
*/
cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
cmd.cmdarg = media->rca << 16;
cmd.resp_type = CARD_RSP_R6;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
if (err)
return err;
if (IS_SD(media))
media->rca = (cmd.response[0] >> 16) & 0xffff;
/* Get the Card-Specific Data */
cmd.cmdidx = MMC_CMD_SEND_CSD;
cmd.resp_type = CARD_RSP_R2;
cmd.cmdarg = media->rca << 16;
cmd.flags = 0;
err = ctrlr->send_cmd(ctrlr, &cmd, NULL);
/* Waiting for the ready status */
sd_mmc_send_status(media, SD_MMC_IO_RETRIES);
if (err)
return err;
memcpy(media->csd, cmd.response, sizeof(media->csd));
if (media->version == MMC_VERSION_UNKNOWN) {
int version = sd_mmc_extract_uint32_bits(media->csd, 2, 4);
switch (version) {
case 0:
media->version = MMC_VERSION_1_2;
break;
case 1:
media->version = MMC_VERSION_1_4;
break;
case 2:
media->version = MMC_VERSION_2_2;
break;
case 3:
media->version = MMC_VERSION_3;
break;
case 4:
media->version = MMC_VERSION_4;
break;
default:
media->version = MMC_VERSION_1_2;
break;
}
}
media->tran_speed = sd_mmc_calculate_transfer_speed(media->csd[0]);
/* Determine the read and write block lengths */
media->read_bl_len = 1 << sd_mmc_extract_uint32_bits(media->csd, 44, 4);
if (IS_SD(media))
media->write_bl_len = media->read_bl_len;
else
media->write_bl_len =
1 << sd_mmc_extract_uint32_bits(media->csd, 102, 4);
sd_mmc_debug("mmc media info: version=%#x, tran_speed=%d\n",
media->version, (int)media->tran_speed);
return 0;
}
|
