]>
Commit | Line | Data |
---|---|---|
46f555f2 PO |
1 | /* |
2 | * linux/drivers/mmc/core/sdio_io.c | |
3 | * | |
ad3868b2 | 4 | * Copyright 2007-2008 Pierre Ossman |
46f555f2 PO |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or (at | |
9 | * your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/mmc/host.h> | |
13 | #include <linux/mmc/card.h> | |
fa64efa1 | 14 | #include <linux/mmc/sdio.h> |
46f555f2 PO |
15 | #include <linux/mmc/sdio_func.h> |
16 | ||
17 | #include "sdio_ops.h" | |
18 | ||
19 | /** | |
20 | * sdio_claim_host - exclusively claim a bus for a certain SDIO function | |
21 | * @func: SDIO function that will be accessed | |
22 | * | |
23 | * Claim a bus for a set of operations. The SDIO function given | |
24 | * is used to figure out which bus is relevant. | |
25 | */ | |
26 | void sdio_claim_host(struct sdio_func *func) | |
27 | { | |
28 | BUG_ON(!func); | |
29 | BUG_ON(!func->card); | |
30 | ||
31 | mmc_claim_host(func->card->host); | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(sdio_claim_host); | |
34 | ||
35 | /** | |
36 | * sdio_release_host - release a bus for a certain SDIO function | |
37 | * @func: SDIO function that was accessed | |
38 | * | |
39 | * Release a bus, allowing others to claim the bus for their | |
40 | * operations. | |
41 | */ | |
42 | void sdio_release_host(struct sdio_func *func) | |
43 | { | |
44 | BUG_ON(!func); | |
45 | BUG_ON(!func->card); | |
46 | ||
47 | mmc_release_host(func->card->host); | |
48 | } | |
49 | EXPORT_SYMBOL_GPL(sdio_release_host); | |
50 | ||
fa64efa1 PO |
51 | /** |
52 | * sdio_enable_func - enables a SDIO function for usage | |
53 | * @func: SDIO function to enable | |
54 | * | |
55 | * Powers up and activates a SDIO function so that register | |
56 | * access is possible. | |
57 | */ | |
58 | int sdio_enable_func(struct sdio_func *func) | |
59 | { | |
60 | int ret; | |
61 | unsigned char reg; | |
62 | unsigned long timeout; | |
63 | ||
64 | BUG_ON(!func); | |
65 | BUG_ON(!func->card); | |
66 | ||
67 | pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); | |
68 | ||
69 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
70 | if (ret) | |
71 | goto err; | |
72 | ||
73 | reg |= 1 << func->num; | |
74 | ||
75 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
76 | if (ret) | |
77 | goto err; | |
78 | ||
62a7573e | 79 | timeout = jiffies + msecs_to_jiffies(func->enable_timeout); |
fa64efa1 PO |
80 | |
81 | while (1) { | |
82 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®); | |
83 | if (ret) | |
84 | goto err; | |
85 | if (reg & (1 << func->num)) | |
86 | break; | |
87 | ret = -ETIME; | |
88 | if (time_after(jiffies, timeout)) | |
89 | goto err; | |
90 | } | |
91 | ||
92 | pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func)); | |
93 | ||
94 | return 0; | |
95 | ||
96 | err: | |
97 | pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func)); | |
98 | return ret; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(sdio_enable_func); | |
101 | ||
102 | /** | |
103 | * sdio_disable_func - disable a SDIO function | |
104 | * @func: SDIO function to disable | |
105 | * | |
106 | * Powers down and deactivates a SDIO function. Register access | |
107 | * to this function will fail until the function is reenabled. | |
108 | */ | |
109 | int sdio_disable_func(struct sdio_func *func) | |
110 | { | |
111 | int ret; | |
112 | unsigned char reg; | |
113 | ||
114 | BUG_ON(!func); | |
115 | BUG_ON(!func->card); | |
116 | ||
117 | pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func)); | |
118 | ||
119 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
120 | if (ret) | |
121 | goto err; | |
122 | ||
123 | reg &= ~(1 << func->num); | |
124 | ||
125 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
126 | if (ret) | |
127 | goto err; | |
128 | ||
129 | pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func)); | |
130 | ||
131 | return 0; | |
132 | ||
133 | err: | |
134 | pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func)); | |
135 | return -EIO; | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(sdio_disable_func); | |
138 | ||
9a08f82b DV |
139 | /** |
140 | * sdio_set_block_size - set the block size of an SDIO function | |
141 | * @func: SDIO function to change | |
142 | * @blksz: new block size or 0 to use the default. | |
143 | * | |
144 | * The default block size is the largest supported by both the function | |
145 | * and the host, with a maximum of 512 to ensure that arbitrarily sized | |
146 | * data transfer use the optimal (least) number of commands. | |
147 | * | |
148 | * A driver may call this to override the default block size set by the | |
149 | * core. This can be used to set a block size greater than the maximum | |
150 | * that reported by the card; it is the driver's responsibility to ensure | |
151 | * it uses a value that the card supports. | |
152 | * | |
153 | * Returns 0 on success, -EINVAL if the host does not support the | |
154 | * requested block size, or -EIO (etc.) if one of the resultant FBR block | |
155 | * size register writes failed. | |
156 | * | |
157 | */ | |
158 | int sdio_set_block_size(struct sdio_func *func, unsigned blksz) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | if (blksz > func->card->host->max_blk_size) | |
163 | return -EINVAL; | |
164 | ||
165 | if (blksz == 0) { | |
6d373331 TW |
166 | blksz = min(func->max_blksize, func->card->host->max_blk_size); |
167 | blksz = min(blksz, 512u); | |
9a08f82b DV |
168 | } |
169 | ||
170 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
171 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE, | |
172 | blksz & 0xff, NULL); | |
173 | if (ret) | |
174 | return ret; | |
175 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
176 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1, | |
177 | (blksz >> 8) & 0xff, NULL); | |
178 | if (ret) | |
179 | return ret; | |
180 | func->cur_blksize = blksz; | |
181 | return 0; | |
182 | } | |
9a08f82b DV |
183 | EXPORT_SYMBOL_GPL(sdio_set_block_size); |
184 | ||
eea0f581 PO |
185 | /* |
186 | * Calculate the maximum byte mode transfer size | |
187 | */ | |
188 | static inline unsigned int sdio_max_byte_size(struct sdio_func *func) | |
189 | { | |
ea901300 TW |
190 | unsigned mval = min(func->card->host->max_seg_size, |
191 | func->card->host->max_blk_size); | |
3fb7fb4a BZ |
192 | |
193 | if (mmc_blksz_for_byte_mode(func->card)) | |
194 | mval = min(mval, func->cur_blksize); | |
195 | else | |
196 | mval = min(mval, func->max_blksize); | |
197 | ||
ea901300 | 198 | return min(mval, 512u); /* maximum size for byte mode */ |
eea0f581 PO |
199 | } |
200 | ||
ad3868b2 PO |
201 | /** |
202 | * sdio_align_size - pads a transfer size to a more optimal value | |
203 | * @func: SDIO function | |
204 | * @sz: original transfer size | |
205 | * | |
206 | * Pads the original data size with a number of extra bytes in | |
207 | * order to avoid controller bugs and/or performance hits | |
208 | * (e.g. some controllers revert to PIO for certain sizes). | |
209 | * | |
210 | * If possible, it will also adjust the size so that it can be | |
211 | * handled in just a single request. | |
212 | * | |
213 | * Returns the improved size, which might be unmodified. | |
214 | */ | |
215 | unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) | |
216 | { | |
217 | unsigned int orig_sz; | |
218 | unsigned int blk_sz, byte_sz; | |
219 | unsigned chunk_sz; | |
220 | ||
221 | orig_sz = sz; | |
222 | ||
223 | /* | |
224 | * Do a first check with the controller, in case it | |
225 | * wants to increase the size up to a point where it | |
226 | * might need more than one block. | |
227 | */ | |
228 | sz = mmc_align_data_size(func->card, sz); | |
229 | ||
230 | /* | |
231 | * If we can still do this with just a byte transfer, then | |
232 | * we're done. | |
233 | */ | |
eea0f581 | 234 | if (sz <= sdio_max_byte_size(func)) |
ad3868b2 PO |
235 | return sz; |
236 | ||
237 | if (func->card->cccr.multi_block) { | |
238 | /* | |
239 | * Check if the transfer is already block aligned | |
240 | */ | |
241 | if ((sz % func->cur_blksize) == 0) | |
242 | return sz; | |
243 | ||
244 | /* | |
245 | * Realign it so that it can be done with one request, | |
246 | * and recheck if the controller still likes it. | |
247 | */ | |
248 | blk_sz = ((sz + func->cur_blksize - 1) / | |
249 | func->cur_blksize) * func->cur_blksize; | |
250 | blk_sz = mmc_align_data_size(func->card, blk_sz); | |
251 | ||
252 | /* | |
253 | * This value is only good if it is still just | |
254 | * one request. | |
255 | */ | |
256 | if ((blk_sz % func->cur_blksize) == 0) | |
257 | return blk_sz; | |
258 | ||
259 | /* | |
260 | * We failed to do one request, but at least try to | |
261 | * pad the remainder properly. | |
262 | */ | |
263 | byte_sz = mmc_align_data_size(func->card, | |
264 | sz % func->cur_blksize); | |
eea0f581 | 265 | if (byte_sz <= sdio_max_byte_size(func)) { |
ad3868b2 PO |
266 | blk_sz = sz / func->cur_blksize; |
267 | return blk_sz * func->cur_blksize + byte_sz; | |
268 | } | |
269 | } else { | |
270 | /* | |
271 | * We need multiple requests, so first check that the | |
272 | * controller can handle the chunk size; | |
273 | */ | |
274 | chunk_sz = mmc_align_data_size(func->card, | |
eea0f581 PO |
275 | sdio_max_byte_size(func)); |
276 | if (chunk_sz == sdio_max_byte_size(func)) { | |
ad3868b2 PO |
277 | /* |
278 | * Fix up the size of the remainder (if any) | |
279 | */ | |
280 | byte_sz = orig_sz % chunk_sz; | |
281 | if (byte_sz) { | |
282 | byte_sz = mmc_align_data_size(func->card, | |
283 | byte_sz); | |
284 | } | |
285 | ||
286 | return (orig_sz / chunk_sz) * chunk_sz + byte_sz; | |
287 | } | |
288 | } | |
289 | ||
290 | /* | |
291 | * The controller is simply incapable of transferring the size | |
292 | * we want in decent manner, so just return the original size. | |
293 | */ | |
294 | return orig_sz; | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(sdio_align_size); | |
297 | ||
eb659468 DV |
298 | /* Split an arbitrarily sized data transfer into several |
299 | * IO_RW_EXTENDED commands. */ | |
300 | static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, | |
301 | unsigned addr, int incr_addr, u8 *buf, unsigned size) | |
302 | { | |
303 | unsigned remainder = size; | |
304 | unsigned max_blocks; | |
305 | int ret; | |
306 | ||
307 | /* Do the bulk of the transfer using block mode (if supported). */ | |
eea0f581 | 308 | if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) { |
eb659468 DV |
309 | /* Blocks per command is limited by host count, host transfer |
310 | * size (we only use a single sg entry) and the maximum for | |
311 | * IO_RW_EXTENDED of 511 blocks. */ | |
6d373331 TW |
312 | max_blocks = min(func->card->host->max_blk_count, |
313 | func->card->host->max_seg_size / func->cur_blksize); | |
314 | max_blocks = min(max_blocks, 511u); | |
eb659468 DV |
315 | |
316 | while (remainder > func->cur_blksize) { | |
317 | unsigned blocks; | |
318 | ||
319 | blocks = remainder / func->cur_blksize; | |
320 | if (blocks > max_blocks) | |
321 | blocks = max_blocks; | |
322 | size = blocks * func->cur_blksize; | |
323 | ||
324 | ret = mmc_io_rw_extended(func->card, write, | |
325 | func->num, addr, incr_addr, buf, | |
326 | blocks, func->cur_blksize); | |
327 | if (ret) | |
328 | return ret; | |
329 | ||
330 | remainder -= size; | |
331 | buf += size; | |
332 | if (incr_addr) | |
333 | addr += size; | |
334 | } | |
335 | } | |
336 | ||
337 | /* Write the remainder using byte mode. */ | |
338 | while (remainder > 0) { | |
eea0f581 | 339 | size = min(remainder, sdio_max_byte_size(func)); |
eb659468 DV |
340 | |
341 | ret = mmc_io_rw_extended(func->card, write, func->num, addr, | |
342 | incr_addr, buf, 1, size); | |
343 | if (ret) | |
344 | return ret; | |
345 | ||
346 | remainder -= size; | |
347 | buf += size; | |
348 | if (incr_addr) | |
349 | addr += size; | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
46f555f2 PO |
354 | /** |
355 | * sdio_readb - read a single byte from a SDIO function | |
356 | * @func: SDIO function to access | |
357 | * @addr: address to read | |
358 | * @err_ret: optional status value from transfer | |
359 | * | |
360 | * Reads a single byte from the address space of a given SDIO | |
361 | * function. If there is a problem reading the address, 0xff | |
362 | * is returned and @err_ret will contain the error code. | |
363 | */ | |
6d373331 | 364 | u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
46f555f2 PO |
365 | { |
366 | int ret; | |
6d373331 | 367 | u8 val; |
46f555f2 PO |
368 | |
369 | BUG_ON(!func); | |
370 | ||
371 | if (err_ret) | |
372 | *err_ret = 0; | |
373 | ||
374 | ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); | |
375 | if (ret) { | |
376 | if (err_ret) | |
377 | *err_ret = ret; | |
378 | return 0xFF; | |
379 | } | |
380 | ||
381 | return val; | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(sdio_readb); | |
384 | ||
385 | /** | |
386 | * sdio_writeb - write a single byte to a SDIO function | |
387 | * @func: SDIO function to access | |
388 | * @b: byte to write | |
389 | * @addr: address to write to | |
390 | * @err_ret: optional status value from transfer | |
391 | * | |
392 | * Writes a single byte to the address space of a given SDIO | |
393 | * function. @err_ret will contain the status of the actual | |
394 | * transfer. | |
395 | */ | |
6d373331 | 396 | void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret) |
46f555f2 PO |
397 | { |
398 | int ret; | |
399 | ||
400 | BUG_ON(!func); | |
401 | ||
402 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); | |
403 | if (err_ret) | |
404 | *err_ret = ret; | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(sdio_writeb); | |
407 | ||
6c1f716e GI |
408 | /** |
409 | * sdio_writeb_readb - write and read a byte from SDIO function | |
410 | * @func: SDIO function to access | |
411 | * @write_byte: byte to write | |
412 | * @addr: address to write to | |
413 | * @err_ret: optional status value from transfer | |
414 | * | |
415 | * Performs a RAW (Read after Write) operation as defined by SDIO spec - | |
416 | * single byte is written to address space of a given SDIO function and | |
417 | * response is read back from the same address, both using single request. | |
418 | * If there is a problem with the operation, 0xff is returned and | |
419 | * @err_ret will contain the error code. | |
420 | */ | |
421 | u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, | |
422 | unsigned int addr, int *err_ret) | |
423 | { | |
424 | int ret; | |
425 | u8 val; | |
426 | ||
427 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, | |
428 | write_byte, &val); | |
429 | if (err_ret) | |
430 | *err_ret = ret; | |
431 | if (ret) | |
432 | val = 0xff; | |
433 | ||
434 | return val; | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(sdio_writeb_readb); | |
437 | ||
112c9db9 PO |
438 | /** |
439 | * sdio_memcpy_fromio - read a chunk of memory from a SDIO function | |
440 | * @func: SDIO function to access | |
441 | * @dst: buffer to store the data | |
442 | * @addr: address to begin reading from | |
443 | * @count: number of bytes to read | |
444 | * | |
eb659468 DV |
445 | * Reads from the address space of a given SDIO function. Return |
446 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
447 | */ |
448 | int sdio_memcpy_fromio(struct sdio_func *func, void *dst, | |
449 | unsigned int addr, int count) | |
450 | { | |
eb659468 | 451 | return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count); |
112c9db9 PO |
452 | } |
453 | EXPORT_SYMBOL_GPL(sdio_memcpy_fromio); | |
454 | ||
455 | /** | |
456 | * sdio_memcpy_toio - write a chunk of memory to a SDIO function | |
457 | * @func: SDIO function to access | |
458 | * @addr: address to start writing to | |
459 | * @src: buffer that contains the data to write | |
460 | * @count: number of bytes to write | |
461 | * | |
eb659468 DV |
462 | * Writes to the address space of a given SDIO function. Return |
463 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
464 | */ |
465 | int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, | |
466 | void *src, int count) | |
467 | { | |
eb659468 | 468 | return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count); |
112c9db9 PO |
469 | } |
470 | EXPORT_SYMBOL_GPL(sdio_memcpy_toio); | |
471 | ||
472 | /** | |
473 | * sdio_readsb - read from a FIFO on a SDIO function | |
474 | * @func: SDIO function to access | |
475 | * @dst: buffer to store the data | |
476 | * @addr: address of (single byte) FIFO | |
477 | * @count: number of bytes to read | |
478 | * | |
eb659468 DV |
479 | * Reads from the specified FIFO of a given SDIO function. Return |
480 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
481 | */ |
482 | int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr, | |
483 | int count) | |
484 | { | |
eb659468 | 485 | return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count); |
112c9db9 | 486 | } |
112c9db9 PO |
487 | EXPORT_SYMBOL_GPL(sdio_readsb); |
488 | ||
489 | /** | |
490 | * sdio_writesb - write to a FIFO of a SDIO function | |
491 | * @func: SDIO function to access | |
492 | * @addr: address of (single byte) FIFO | |
493 | * @src: buffer that contains the data to write | |
494 | * @count: number of bytes to write | |
495 | * | |
eb659468 DV |
496 | * Writes to the specified FIFO of a given SDIO function. Return |
497 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
498 | */ |
499 | int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src, | |
500 | int count) | |
501 | { | |
eb659468 | 502 | return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count); |
112c9db9 PO |
503 | } |
504 | EXPORT_SYMBOL_GPL(sdio_writesb); | |
505 | ||
506 | /** | |
507 | * sdio_readw - read a 16 bit integer from a SDIO function | |
508 | * @func: SDIO function to access | |
509 | * @addr: address to read | |
510 | * @err_ret: optional status value from transfer | |
511 | * | |
512 | * Reads a 16 bit integer from the address space of a given SDIO | |
513 | * function. If there is a problem reading the address, 0xffff | |
514 | * is returned and @err_ret will contain the error code. | |
515 | */ | |
6d373331 | 516 | u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
517 | { |
518 | int ret; | |
519 | ||
520 | if (err_ret) | |
521 | *err_ret = 0; | |
522 | ||
523 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); | |
524 | if (ret) { | |
525 | if (err_ret) | |
526 | *err_ret = ret; | |
527 | return 0xFFFF; | |
528 | } | |
529 | ||
6d373331 | 530 | return le16_to_cpup((__le16 *)func->tmpbuf); |
112c9db9 PO |
531 | } |
532 | EXPORT_SYMBOL_GPL(sdio_readw); | |
533 | ||
534 | /** | |
535 | * sdio_writew - write a 16 bit integer to a SDIO function | |
536 | * @func: SDIO function to access | |
537 | * @b: integer to write | |
538 | * @addr: address to write to | |
539 | * @err_ret: optional status value from transfer | |
540 | * | |
541 | * Writes a 16 bit integer to the address space of a given SDIO | |
542 | * function. @err_ret will contain the status of the actual | |
543 | * transfer. | |
544 | */ | |
6d373331 | 545 | void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
546 | { |
547 | int ret; | |
548 | ||
6d373331 | 549 | *(__le16 *)func->tmpbuf = cpu_to_le16(b); |
112c9db9 PO |
550 | |
551 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2); | |
552 | if (err_ret) | |
553 | *err_ret = ret; | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(sdio_writew); | |
556 | ||
557 | /** | |
558 | * sdio_readl - read a 32 bit integer from a SDIO function | |
559 | * @func: SDIO function to access | |
560 | * @addr: address to read | |
561 | * @err_ret: optional status value from transfer | |
562 | * | |
563 | * Reads a 32 bit integer from the address space of a given SDIO | |
564 | * function. If there is a problem reading the address, | |
565 | * 0xffffffff is returned and @err_ret will contain the error | |
566 | * code. | |
567 | */ | |
6d373331 | 568 | u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
569 | { |
570 | int ret; | |
571 | ||
572 | if (err_ret) | |
573 | *err_ret = 0; | |
574 | ||
575 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); | |
576 | if (ret) { | |
577 | if (err_ret) | |
578 | *err_ret = ret; | |
579 | return 0xFFFFFFFF; | |
580 | } | |
581 | ||
6d373331 | 582 | return le32_to_cpup((__le32 *)func->tmpbuf); |
112c9db9 PO |
583 | } |
584 | EXPORT_SYMBOL_GPL(sdio_readl); | |
585 | ||
586 | /** | |
587 | * sdio_writel - write a 32 bit integer to a SDIO function | |
588 | * @func: SDIO function to access | |
589 | * @b: integer to write | |
590 | * @addr: address to write to | |
591 | * @err_ret: optional status value from transfer | |
592 | * | |
593 | * Writes a 32 bit integer to the address space of a given SDIO | |
594 | * function. @err_ret will contain the status of the actual | |
595 | * transfer. | |
596 | */ | |
6d373331 | 597 | void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
598 | { |
599 | int ret; | |
600 | ||
6d373331 | 601 | *(__le32 *)func->tmpbuf = cpu_to_le32(b); |
112c9db9 PO |
602 | |
603 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4); | |
604 | if (err_ret) | |
605 | *err_ret = ret; | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(sdio_writel); | |
608 | ||
7806cdb4 DV |
609 | /** |
610 | * sdio_f0_readb - read a single byte from SDIO function 0 | |
611 | * @func: an SDIO function of the card | |
612 | * @addr: address to read | |
613 | * @err_ret: optional status value from transfer | |
614 | * | |
615 | * Reads a single byte from the address space of SDIO function 0. | |
616 | * If there is a problem reading the address, 0xff is returned | |
617 | * and @err_ret will contain the error code. | |
618 | */ | |
619 | unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, | |
620 | int *err_ret) | |
621 | { | |
622 | int ret; | |
623 | unsigned char val; | |
624 | ||
625 | BUG_ON(!func); | |
626 | ||
627 | if (err_ret) | |
628 | *err_ret = 0; | |
629 | ||
630 | ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); | |
631 | if (ret) { | |
632 | if (err_ret) | |
633 | *err_ret = ret; | |
634 | return 0xFF; | |
635 | } | |
636 | ||
637 | return val; | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(sdio_f0_readb); | |
640 | ||
641 | /** | |
642 | * sdio_f0_writeb - write a single byte to SDIO function 0 | |
643 | * @func: an SDIO function of the card | |
644 | * @b: byte to write | |
645 | * @addr: address to write to | |
646 | * @err_ret: optional status value from transfer | |
647 | * | |
648 | * Writes a single byte to the address space of SDIO function 0. | |
649 | * @err_ret will contain the status of the actual transfer. | |
650 | * | |
651 | * Only writes to the vendor specific CCCR registers (0xF0 - | |
652 | * 0xFF) are permiited; @err_ret will be set to -EINVAL for * | |
653 | * writes outside this range. | |
654 | */ | |
655 | void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, | |
656 | int *err_ret) | |
657 | { | |
658 | int ret; | |
659 | ||
660 | BUG_ON(!func); | |
661 | ||
7c979ec7 | 662 | if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
7806cdb4 DV |
663 | if (err_ret) |
664 | *err_ret = -EINVAL; | |
665 | return; | |
666 | } | |
667 | ||
668 | ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL); | |
669 | if (err_ret) | |
670 | *err_ret = ret; | |
671 | } | |
672 | EXPORT_SYMBOL_GPL(sdio_f0_writeb); | |
da68c4eb NP |
673 | |
674 | /** | |
675 | * sdio_get_host_pm_caps - get host power management capabilities | |
676 | * @func: SDIO function attached to host | |
677 | * | |
678 | * Returns a capability bitmask corresponding to power management | |
679 | * features supported by the host controller that the card function | |
680 | * might rely upon during a system suspend. The host doesn't need | |
681 | * to be claimed, nor the function active, for this information to be | |
682 | * obtained. | |
683 | */ | |
684 | mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) | |
685 | { | |
686 | BUG_ON(!func); | |
687 | BUG_ON(!func->card); | |
688 | ||
689 | return func->card->host->pm_caps; | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); | |
692 | ||
693 | /** | |
694 | * sdio_set_host_pm_flags - set wanted host power management capabilities | |
695 | * @func: SDIO function attached to host | |
696 | * | |
697 | * Set a capability bitmask corresponding to wanted host controller | |
698 | * power management features for the upcoming suspend state. | |
699 | * This must be called, if needed, each time the suspend method of | |
700 | * the function driver is called, and must contain only bits that | |
701 | * were returned by sdio_get_host_pm_caps(). | |
702 | * The host doesn't need to be claimed, nor the function active, | |
703 | * for this information to be set. | |
704 | */ | |
705 | int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) | |
706 | { | |
707 | struct mmc_host *host; | |
708 | ||
709 | BUG_ON(!func); | |
710 | BUG_ON(!func->card); | |
711 | ||
712 | host = func->card->host; | |
713 | ||
714 | if (flags & ~host->pm_caps) | |
715 | return -EINVAL; | |
716 | ||
717 | /* function suspend methods are serialized, hence no lock needed */ | |
718 | host->pm_flags |= flags; | |
719 | return 0; | |
720 | } | |
721 | EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); |