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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
|
/*
* linux/drivers/mmc/sdio.c
*
* Copyright 2006-2007 Pierre Ossman
*
* 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.
*/
#include <linux/err.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include "core.h"
#include "bus.h"
#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
#include "sdio_ops.h"
#include "sdio_cis.h"
static int sdio_read_fbr(struct sdio_func *func)
{
int ret;
unsigned char data;
ret = mmc_io_rw_direct(func->card, 0, 0,
SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
if (ret)
goto out;
data &= 0x0f;
if (data == 0x0f) {
ret = mmc_io_rw_direct(func->card, 0, 0,
SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
if (ret)
goto out;
}
func->class = data;
out:
return ret;
}
static int sdio_init_func(struct mmc_card *card, unsigned int fn)
{
int ret;
struct sdio_func *func;
BUG_ON(fn > SDIO_MAX_FUNCS);
func = sdio_alloc_func(card);
if (IS_ERR(func))
return PTR_ERR(func);
func->num = fn;
ret = sdio_read_fbr(func);
if (ret)
goto fail;
ret = sdio_read_func_cis(func);
if (ret)
goto fail;
card->sdio_func[fn - 1] = func;
return 0;
fail:
/*
* It is okay to remove the function here even though we hold
* the host lock as we haven't registered the device yet.
*/
sdio_remove_func(func);
return ret;
}
static int sdio_read_cccr(struct mmc_card *card)
{
int ret;
int cccr_vsn;
unsigned char data;
memset(&card->cccr, 0, sizeof(struct sdio_cccr));
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
if (ret)
goto out;
cccr_vsn = data & 0x0f;
if (cccr_vsn > SDIO_CCCR_REV_1_20) {
printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
mmc_hostname(card->host), cccr_vsn);
return -EINVAL;
}
card->cccr.sdio_vsn = (data & 0xf0) >> 4;
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
if (ret)
goto out;
if (data & SDIO_CCCR_CAP_SMB)
card->cccr.multi_block = 1;
if (data & SDIO_CCCR_CAP_LSC)
card->cccr.low_speed = 1;
if (data & SDIO_CCCR_CAP_4BLS)
card->cccr.wide_bus = 1;
if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
if (ret)
goto out;
if (data & SDIO_POWER_SMPC)
card->cccr.high_power = 1;
}
if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
if (ret)
goto out;
if (data & SDIO_SPEED_SHS)
card->cccr.high_speed = 1;
}
out:
return ret;
}
static int sdio_enable_wide(struct mmc_card *card)
{
int ret;
u8 ctrl;
if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
return 0;
if (card->cccr.low_speed && !card->cccr.wide_bus)
return 0;
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
if (ret)
return ret;
ctrl |= SDIO_BUS_WIDTH_4BIT;
ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
if (ret)
return ret;
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
return 0;
}
/*
* Host is being removed. Free up the current card.
*/
static void mmc_sdio_remove(struct mmc_host *host)
{
int i;
BUG_ON(!host);
BUG_ON(!host->card);
for (i = 0;i < host->card->sdio_funcs;i++) {
if (host->card->sdio_func[i]) {
sdio_remove_func(host->card->sdio_func[i]);
host->card->sdio_func[i] = NULL;
}
}
mmc_remove_card(host->card);
host->card = NULL;
}
/*
* Card detection callback from host.
*/
static void mmc_sdio_detect(struct mmc_host *host)
{
int err;
BUG_ON(!host);
BUG_ON(!host->card);
mmc_claim_host(host);
/*
* Just check if our card has been removed.
*/
err = mmc_select_card(host->card);
mmc_release_host(host);
if (err) {
mmc_sdio_remove(host);
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_release_host(host);
}
}
static const struct mmc_bus_ops mmc_sdio_ops = {
.remove = mmc_sdio_remove,
.detect = mmc_sdio_detect,
};
/*
* Starting point for SDIO card init.
*/
int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
{
int err;
int i, funcs;
struct mmc_card *card;
BUG_ON(!host);
WARN_ON(!host->claimed);
mmc_attach_bus(host, &mmc_sdio_ops);
/*
* Sanity check the voltages that the card claims to
* support.
*/
if (ocr & 0x7F) {
printk(KERN_WARNING "%s: card claims to support voltages "
"below the defined range. These will be ignored.\n",
mmc_hostname(host));
ocr &= ~0x7F;
}
if (ocr & MMC_VDD_165_195) {
printk(KERN_WARNING "%s: SDIO card claims to support the "
"incompletely defined 'low voltage range'. This "
"will be ignored.\n", mmc_hostname(host));
ocr &= ~MMC_VDD_165_195;
}
host->ocr = mmc_select_voltage(host, ocr);
/*
* Can we support the voltage(s) of the card(s)?
*/
if (!host->ocr) {
err = -EINVAL;
goto err;
}
/*
* Inform the card of the voltage
*/
err = mmc_send_io_op_cond(host, host->ocr, &ocr);
if (err)
goto err;
/*
* The number of functions on the card is encoded inside
* the ocr.
*/
funcs = (ocr & 0x70000000) >> 28;
/*
* Allocate card structure.
*/
card = mmc_alloc_card(host);
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto err;
}
card->type = MMC_TYPE_SDIO;
card->sdio_funcs = funcs;
host->card = card;
/*
* Set card RCA.
*/
err = mmc_send_relative_addr(host, &card->rca);
if (err)
goto remove;
mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
/*
* Select card, as all following commands rely on that.
*/
err = mmc_select_card(card);
if (err)
goto remove;
/*
* Read the common registers.
*/
err = sdio_read_cccr(card);
if (err)
goto remove;
/*
* Read the common CIS tuples.
*/
err = sdio_read_common_cis(card);
if (err)
goto remove;
/*
* No support for high-speed yet, so just set
* the card's maximum speed.
*/
mmc_set_clock(host, card->cis.max_dtr);
/*
* Switch to wider bus (if supported).
*/
err = sdio_enable_wide(
|