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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 | ||
3ef77af1 | 12 | #include <linux/export.h> |
46f555f2 PO |
13 | #include <linux/mmc/host.h> |
14 | #include <linux/mmc/card.h> | |
fa64efa1 | 15 | #include <linux/mmc/sdio.h> |
46f555f2 PO |
16 | #include <linux/mmc/sdio_func.h> |
17 | ||
18 | #include "sdio_ops.h" | |
19 | ||
20 | /** | |
21 | * sdio_claim_host - exclusively claim a bus for a certain SDIO function | |
22 | * @func: SDIO function that will be accessed | |
23 | * | |
24 | * Claim a bus for a set of operations. The SDIO function given | |
25 | * is used to figure out which bus is relevant. | |
26 | */ | |
27 | void sdio_claim_host(struct sdio_func *func) | |
28 | { | |
29 | BUG_ON(!func); | |
30 | BUG_ON(!func->card); | |
31 | ||
32 | mmc_claim_host(func->card->host); | |
33 | } | |
34 | EXPORT_SYMBOL_GPL(sdio_claim_host); | |
35 | ||
36 | /** | |
37 | * sdio_release_host - release a bus for a certain SDIO function | |
38 | * @func: SDIO function that was accessed | |
39 | * | |
40 | * Release a bus, allowing others to claim the bus for their | |
41 | * operations. | |
42 | */ | |
43 | void sdio_release_host(struct sdio_func *func) | |
44 | { | |
45 | BUG_ON(!func); | |
46 | BUG_ON(!func->card); | |
47 | ||
48 | mmc_release_host(func->card->host); | |
49 | } | |
50 | EXPORT_SYMBOL_GPL(sdio_release_host); | |
51 | ||
fa64efa1 PO |
52 | /** |
53 | * sdio_enable_func - enables a SDIO function for usage | |
54 | * @func: SDIO function to enable | |
55 | * | |
56 | * Powers up and activates a SDIO function so that register | |
57 | * access is possible. | |
58 | */ | |
59 | int sdio_enable_func(struct sdio_func *func) | |
60 | { | |
61 | int ret; | |
62 | unsigned char reg; | |
63 | unsigned long timeout; | |
64 | ||
65 | BUG_ON(!func); | |
66 | BUG_ON(!func->card); | |
67 | ||
68 | pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); | |
69 | ||
70 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
71 | if (ret) | |
72 | goto err; | |
73 | ||
74 | reg |= 1 << func->num; | |
75 | ||
76 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
77 | if (ret) | |
78 | goto err; | |
79 | ||
62a7573e | 80 | timeout = jiffies + msecs_to_jiffies(func->enable_timeout); |
fa64efa1 PO |
81 | |
82 | while (1) { | |
83 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®); | |
84 | if (ret) | |
85 | goto err; | |
86 | if (reg & (1 << func->num)) | |
87 | break; | |
88 | ret = -ETIME; | |
89 | if (time_after(jiffies, timeout)) | |
90 | goto err; | |
91 | } | |
92 | ||
93 | pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func)); | |
94 | ||
95 | return 0; | |
96 | ||
97 | err: | |
98 | pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func)); | |
99 | return ret; | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(sdio_enable_func); | |
102 | ||
103 | /** | |
104 | * sdio_disable_func - disable a SDIO function | |
105 | * @func: SDIO function to disable | |
106 | * | |
107 | * Powers down and deactivates a SDIO function. Register access | |
108 | * to this function will fail until the function is reenabled. | |
109 | */ | |
110 | int sdio_disable_func(struct sdio_func *func) | |
111 | { | |
112 | int ret; | |
113 | unsigned char reg; | |
114 | ||
115 | BUG_ON(!func); | |
116 | BUG_ON(!func->card); | |
117 | ||
118 | pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func)); | |
119 | ||
120 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
121 | if (ret) | |
122 | goto err; | |
123 | ||
124 | reg &= ~(1 << func->num); | |
125 | ||
126 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
127 | if (ret) | |
128 | goto err; | |
129 | ||
130 | pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func)); | |
131 | ||
132 | return 0; | |
133 | ||
134 | err: | |
135 | pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func)); | |
136 | return -EIO; | |
137 | } | |
138 | EXPORT_SYMBOL_GPL(sdio_disable_func); | |
139 | ||
9a08f82b DV |
140 | /** |
141 | * sdio_set_block_size - set the block size of an SDIO function | |
142 | * @func: SDIO function to change | |
143 | * @blksz: new block size or 0 to use the default. | |
144 | * | |
145 | * The default block size is the largest supported by both the function | |
146 | * and the host, with a maximum of 512 to ensure that arbitrarily sized | |
147 | * data transfer use the optimal (least) number of commands. | |
148 | * | |
149 | * A driver may call this to override the default block size set by the | |
150 | * core. This can be used to set a block size greater than the maximum | |
151 | * that reported by the card; it is the driver's responsibility to ensure | |
152 | * it uses a value that the card supports. | |
153 | * | |
154 | * Returns 0 on success, -EINVAL if the host does not support the | |
155 | * requested block size, or -EIO (etc.) if one of the resultant FBR block | |
156 | * size register writes failed. | |
157 | * | |
158 | */ | |
159 | int sdio_set_block_size(struct sdio_func *func, unsigned blksz) | |
160 | { | |
161 | int ret; | |
162 | ||
163 | if (blksz > func->card->host->max_blk_size) | |
164 | return -EINVAL; | |
165 | ||
166 | if (blksz == 0) { | |
6d373331 TW |
167 | blksz = min(func->max_blksize, func->card->host->max_blk_size); |
168 | blksz = min(blksz, 512u); | |
9a08f82b DV |
169 | } |
170 | ||
171 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
172 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE, | |
173 | blksz & 0xff, NULL); | |
174 | if (ret) | |
175 | return ret; | |
176 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
177 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1, | |
178 | (blksz >> 8) & 0xff, NULL); | |
179 | if (ret) | |
180 | return ret; | |
181 | func->cur_blksize = blksz; | |
182 | return 0; | |
183 | } | |
9a08f82b DV |
184 | EXPORT_SYMBOL_GPL(sdio_set_block_size); |
185 | ||
eea0f581 PO |
186 | /* |
187 | * Calculate the maximum byte mode transfer size | |
188 | */ | |
189 | static inline unsigned int sdio_max_byte_size(struct sdio_func *func) | |
190 | { | |
ea901300 TW |
191 | unsigned mval = min(func->card->host->max_seg_size, |
192 | func->card->host->max_blk_size); | |
3fb7fb4a BZ |
193 | |
194 | if (mmc_blksz_for_byte_mode(func->card)) | |
195 | mval = min(mval, func->cur_blksize); | |
196 | else | |
197 | mval = min(mval, func->max_blksize); | |
198 | ||
052d81da SNX |
199 | if (mmc_card_broken_byte_mode_512(func->card)) |
200 | return min(mval, 511u); | |
201 | ||
ea901300 | 202 | return min(mval, 512u); /* maximum size for byte mode */ |
eea0f581 PO |
203 | } |
204 | ||
ad3868b2 PO |
205 | /** |
206 | * sdio_align_size - pads a transfer size to a more optimal value | |
207 | * @func: SDIO function | |
208 | * @sz: original transfer size | |
209 | * | |
210 | * Pads the original data size with a number of extra bytes in | |
211 | * order to avoid controller bugs and/or performance hits | |
212 | * (e.g. some controllers revert to PIO for certain sizes). | |
213 | * | |
214 | * If possible, it will also adjust the size so that it can be | |
215 | * handled in just a single request. | |
216 | * | |
217 | * Returns the improved size, which might be unmodified. | |
218 | */ | |
219 | unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) | |
220 | { | |
221 | unsigned int orig_sz; | |
222 | unsigned int blk_sz, byte_sz; | |
223 | unsigned chunk_sz; | |
224 | ||
225 | orig_sz = sz; | |
226 | ||
227 | /* | |
228 | * Do a first check with the controller, in case it | |
229 | * wants to increase the size up to a point where it | |
230 | * might need more than one block. | |
231 | */ | |
232 | sz = mmc_align_data_size(func->card, sz); | |
233 | ||
234 | /* | |
235 | * If we can still do this with just a byte transfer, then | |
236 | * we're done. | |
237 | */ | |
eea0f581 | 238 | if (sz <= sdio_max_byte_size(func)) |
ad3868b2 PO |
239 | return sz; |
240 | ||
241 | if (func->card->cccr.multi_block) { | |
242 | /* | |
243 | * Check if the transfer is already block aligned | |
244 | */ | |
245 | if ((sz % func->cur_blksize) == 0) | |
246 | return sz; | |
247 | ||
248 | /* | |
249 | * Realign it so that it can be done with one request, | |
250 | * and recheck if the controller still likes it. | |
251 | */ | |
252 | blk_sz = ((sz + func->cur_blksize - 1) / | |
253 | func->cur_blksize) * func->cur_blksize; | |
254 | blk_sz = mmc_align_data_size(func->card, blk_sz); | |
255 | ||
256 | /* | |
257 | * This value is only good if it is still just | |
258 | * one request. | |
259 | */ | |
260 | if ((blk_sz % func->cur_blksize) == 0) | |
261 | return blk_sz; | |
262 | ||
263 | /* | |
264 | * We failed to do one request, but at least try to | |
265 | * pad the remainder properly. | |
266 | */ | |
267 | byte_sz = mmc_align_data_size(func->card, | |
268 | sz % func->cur_blksize); | |
eea0f581 | 269 | if (byte_sz <= sdio_max_byte_size(func)) { |
ad3868b2 PO |
270 | blk_sz = sz / func->cur_blksize; |
271 | return blk_sz * func->cur_blksize + byte_sz; | |
272 | } | |
273 | } else { | |
274 | /* | |
275 | * We need multiple requests, so first check that the | |
276 | * controller can handle the chunk size; | |
277 | */ | |
278 | chunk_sz = mmc_align_data_size(func->card, | |
eea0f581 PO |
279 | sdio_max_byte_size(func)); |
280 | if (chunk_sz == sdio_max_byte_size(func)) { | |
ad3868b2 PO |
281 | /* |
282 | * Fix up the size of the remainder (if any) | |
283 | */ | |
284 | byte_sz = orig_sz % chunk_sz; | |
285 | if (byte_sz) { | |
286 | byte_sz = mmc_align_data_size(func->card, | |
287 | byte_sz); | |
288 | } | |
289 | ||
290 | return (orig_sz / chunk_sz) * chunk_sz + byte_sz; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * The controller is simply incapable of transferring the size | |
296 | * we want in decent manner, so just return the original size. | |
297 | */ | |
298 | return orig_sz; | |
299 | } | |
300 | EXPORT_SYMBOL_GPL(sdio_align_size); | |
301 | ||
eb659468 DV |
302 | /* Split an arbitrarily sized data transfer into several |
303 | * IO_RW_EXTENDED commands. */ | |
304 | static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, | |
305 | unsigned addr, int incr_addr, u8 *buf, unsigned size) | |
306 | { | |
307 | unsigned remainder = size; | |
308 | unsigned max_blocks; | |
309 | int ret; | |
310 | ||
311 | /* Do the bulk of the transfer using block mode (if supported). */ | |
eea0f581 | 312 | if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) { |
eb659468 DV |
313 | /* Blocks per command is limited by host count, host transfer |
314 | * size (we only use a single sg entry) and the maximum for | |
315 | * IO_RW_EXTENDED of 511 blocks. */ | |
6d373331 TW |
316 | max_blocks = min(func->card->host->max_blk_count, |
317 | func->card->host->max_seg_size / func->cur_blksize); | |
318 | max_blocks = min(max_blocks, 511u); | |
eb659468 | 319 | |
052d81da | 320 | while (remainder >= func->cur_blksize) { |
eb659468 DV |
321 | unsigned blocks; |
322 | ||
323 | blocks = remainder / func->cur_blksize; | |
324 | if (blocks > max_blocks) | |
325 | blocks = max_blocks; | |
326 | size = blocks * func->cur_blksize; | |
327 | ||
328 | ret = mmc_io_rw_extended(func->card, write, | |
329 | func->num, addr, incr_addr, buf, | |
330 | blocks, func->cur_blksize); | |
331 | if (ret) | |
332 | return ret; | |
333 | ||
334 | remainder -= size; | |
335 | buf += size; | |
336 | if (incr_addr) | |
337 | addr += size; | |
338 | } | |
339 | } | |
340 | ||
341 | /* Write the remainder using byte mode. */ | |
342 | while (remainder > 0) { | |
eea0f581 | 343 | size = min(remainder, sdio_max_byte_size(func)); |
eb659468 | 344 | |
052d81da | 345 | /* Indicate byte mode by setting "blocks" = 0 */ |
eb659468 | 346 | ret = mmc_io_rw_extended(func->card, write, func->num, addr, |
052d81da | 347 | incr_addr, buf, 0, size); |
eb659468 DV |
348 | if (ret) |
349 | return ret; | |
350 | ||
351 | remainder -= size; | |
352 | buf += size; | |
353 | if (incr_addr) | |
354 | addr += size; | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
46f555f2 PO |
359 | /** |
360 | * sdio_readb - read a single byte from a SDIO function | |
361 | * @func: SDIO function to access | |
362 | * @addr: address to read | |
363 | * @err_ret: optional status value from transfer | |
364 | * | |
365 | * Reads a single byte from the address space of a given SDIO | |
366 | * function. If there is a problem reading the address, 0xff | |
367 | * is returned and @err_ret will contain the error code. | |
368 | */ | |
6d373331 | 369 | u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
46f555f2 PO |
370 | { |
371 | int ret; | |
6d373331 | 372 | u8 val; |
46f555f2 PO |
373 | |
374 | BUG_ON(!func); | |
375 | ||
376 | if (err_ret) | |
377 | *err_ret = 0; | |
378 | ||
379 | ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); | |
380 | if (ret) { | |
381 | if (err_ret) | |
382 | *err_ret = ret; | |
383 | return 0xFF; | |
384 | } | |
385 | ||
386 | return val; | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(sdio_readb); | |
389 | ||
390 | /** | |
391 | * sdio_writeb - write a single byte to a SDIO function | |
392 | * @func: SDIO function to access | |
393 | * @b: byte to write | |
394 | * @addr: address to write to | |
395 | * @err_ret: optional status value from transfer | |
396 | * | |
397 | * Writes a single byte to the address space of a given SDIO | |
398 | * function. @err_ret will contain the status of the actual | |
399 | * transfer. | |
400 | */ | |
6d373331 | 401 | void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret) |
46f555f2 PO |
402 | { |
403 | int ret; | |
404 | ||
405 | BUG_ON(!func); | |
406 | ||
407 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); | |
408 | if (err_ret) | |
409 | *err_ret = ret; | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(sdio_writeb); | |
412 | ||
6c1f716e GI |
413 | /** |
414 | * sdio_writeb_readb - write and read a byte from SDIO function | |
415 | * @func: SDIO function to access | |
416 | * @write_byte: byte to write | |
417 | * @addr: address to write to | |
418 | * @err_ret: optional status value from transfer | |
419 | * | |
420 | * Performs a RAW (Read after Write) operation as defined by SDIO spec - | |
421 | * single byte is written to address space of a given SDIO function and | |
422 | * response is read back from the same address, both using single request. | |
423 | * If there is a problem with the operation, 0xff is returned and | |
424 | * @err_ret will contain the error code. | |
425 | */ | |
426 | u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, | |
427 | unsigned int addr, int *err_ret) | |
428 | { | |
429 | int ret; | |
430 | u8 val; | |
431 | ||
432 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, | |
433 | write_byte, &val); | |
434 | if (err_ret) | |
435 | *err_ret = ret; | |
436 | if (ret) | |
437 | val = 0xff; | |
438 | ||
439 | return val; | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(sdio_writeb_readb); | |
442 | ||
112c9db9 PO |
443 | /** |
444 | * sdio_memcpy_fromio - read a chunk of memory from a SDIO function | |
445 | * @func: SDIO function to access | |
446 | * @dst: buffer to store the data | |
447 | * @addr: address to begin reading from | |
448 | * @count: number of bytes to read | |
449 | * | |
eb659468 DV |
450 | * Reads from the address space of a given SDIO function. Return |
451 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
452 | */ |
453 | int sdio_memcpy_fromio(struct sdio_func *func, void *dst, | |
454 | unsigned int addr, int count) | |
455 | { | |
eb659468 | 456 | return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count); |
112c9db9 PO |
457 | } |
458 | EXPORT_SYMBOL_GPL(sdio_memcpy_fromio); | |
459 | ||
460 | /** | |
461 | * sdio_memcpy_toio - write a chunk of memory to a SDIO function | |
462 | * @func: SDIO function to access | |
463 | * @addr: address to start writing to | |
464 | * @src: buffer that contains the data to write | |
465 | * @count: number of bytes to write | |
466 | * | |
eb659468 DV |
467 | * Writes to the address space of a given SDIO function. Return |
468 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
469 | */ |
470 | int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, | |
471 | void *src, int count) | |
472 | { | |
eb659468 | 473 | return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count); |
112c9db9 PO |
474 | } |
475 | EXPORT_SYMBOL_GPL(sdio_memcpy_toio); | |
476 | ||
477 | /** | |
478 | * sdio_readsb - read from a FIFO on a SDIO function | |
479 | * @func: SDIO function to access | |
480 | * @dst: buffer to store the data | |
481 | * @addr: address of (single byte) FIFO | |
482 | * @count: number of bytes to read | |
483 | * | |
eb659468 DV |
484 | * Reads from the specified FIFO of a given SDIO function. Return |
485 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
486 | */ |
487 | int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr, | |
488 | int count) | |
489 | { | |
eb659468 | 490 | return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count); |
112c9db9 | 491 | } |
112c9db9 PO |
492 | EXPORT_SYMBOL_GPL(sdio_readsb); |
493 | ||
494 | /** | |
495 | * sdio_writesb - write to a FIFO of a SDIO function | |
496 | * @func: SDIO function to access | |
497 | * @addr: address of (single byte) FIFO | |
498 | * @src: buffer that contains the data to write | |
499 | * @count: number of bytes to write | |
500 | * | |
eb659468 DV |
501 | * Writes to the specified FIFO of a given SDIO function. Return |
502 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
503 | */ |
504 | int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src, | |
505 | int count) | |
506 | { | |
eb659468 | 507 | return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count); |
112c9db9 PO |
508 | } |
509 | EXPORT_SYMBOL_GPL(sdio_writesb); | |
510 | ||
511 | /** | |
512 | * sdio_readw - read a 16 bit integer from a SDIO function | |
513 | * @func: SDIO function to access | |
514 | * @addr: address to read | |
515 | * @err_ret: optional status value from transfer | |
516 | * | |
517 | * Reads a 16 bit integer from the address space of a given SDIO | |
518 | * function. If there is a problem reading the address, 0xffff | |
519 | * is returned and @err_ret will contain the error code. | |
520 | */ | |
6d373331 | 521 | u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
522 | { |
523 | int ret; | |
524 | ||
525 | if (err_ret) | |
526 | *err_ret = 0; | |
527 | ||
528 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); | |
529 | if (ret) { | |
530 | if (err_ret) | |
531 | *err_ret = ret; | |
532 | return 0xFFFF; | |
533 | } | |
534 | ||
6d373331 | 535 | return le16_to_cpup((__le16 *)func->tmpbuf); |
112c9db9 PO |
536 | } |
537 | EXPORT_SYMBOL_GPL(sdio_readw); | |
538 | ||
539 | /** | |
540 | * sdio_writew - write a 16 bit integer to a SDIO function | |
541 | * @func: SDIO function to access | |
542 | * @b: integer to write | |
543 | * @addr: address to write to | |
544 | * @err_ret: optional status value from transfer | |
545 | * | |
546 | * Writes a 16 bit integer to the address space of a given SDIO | |
547 | * function. @err_ret will contain the status of the actual | |
548 | * transfer. | |
549 | */ | |
6d373331 | 550 | void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
551 | { |
552 | int ret; | |
553 | ||
6d373331 | 554 | *(__le16 *)func->tmpbuf = cpu_to_le16(b); |
112c9db9 PO |
555 | |
556 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2); | |
557 | if (err_ret) | |
558 | *err_ret = ret; | |
559 | } | |
560 | EXPORT_SYMBOL_GPL(sdio_writew); | |
561 | ||
562 | /** | |
563 | * sdio_readl - read a 32 bit integer from a SDIO function | |
564 | * @func: SDIO function to access | |
565 | * @addr: address to read | |
566 | * @err_ret: optional status value from transfer | |
567 | * | |
568 | * Reads a 32 bit integer from the address space of a given SDIO | |
569 | * function. If there is a problem reading the address, | |
570 | * 0xffffffff is returned and @err_ret will contain the error | |
571 | * code. | |
572 | */ | |
6d373331 | 573 | u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
574 | { |
575 | int ret; | |
576 | ||
577 | if (err_ret) | |
578 | *err_ret = 0; | |
579 | ||
580 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); | |
581 | if (ret) { | |
582 | if (err_ret) | |
583 | *err_ret = ret; | |
584 | return 0xFFFFFFFF; | |
585 | } | |
586 | ||
6d373331 | 587 | return le32_to_cpup((__le32 *)func->tmpbuf); |
112c9db9 PO |
588 | } |
589 | EXPORT_SYMBOL_GPL(sdio_readl); | |
590 | ||
591 | /** | |
592 | * sdio_writel - write a 32 bit integer to a SDIO function | |
593 | * @func: SDIO function to access | |
594 | * @b: integer to write | |
595 | * @addr: address to write to | |
596 | * @err_ret: optional status value from transfer | |
597 | * | |
598 | * Writes a 32 bit integer to the address space of a given SDIO | |
599 | * function. @err_ret will contain the status of the actual | |
600 | * transfer. | |
601 | */ | |
6d373331 | 602 | void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
603 | { |
604 | int ret; | |
605 | ||
6d373331 | 606 | *(__le32 *)func->tmpbuf = cpu_to_le32(b); |
112c9db9 PO |
607 | |
608 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4); | |
609 | if (err_ret) | |
610 | *err_ret = ret; | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(sdio_writel); | |
613 | ||
7806cdb4 DV |
614 | /** |
615 | * sdio_f0_readb - read a single byte from SDIO function 0 | |
616 | * @func: an SDIO function of the card | |
617 | * @addr: address to read | |
618 | * @err_ret: optional status value from transfer | |
619 | * | |
620 | * Reads a single byte from the address space of SDIO function 0. | |
621 | * If there is a problem reading the address, 0xff is returned | |
622 | * and @err_ret will contain the error code. | |
623 | */ | |
624 | unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, | |
625 | int *err_ret) | |
626 | { | |
627 | int ret; | |
628 | unsigned char val; | |
629 | ||
630 | BUG_ON(!func); | |
631 | ||
632 | if (err_ret) | |
633 | *err_ret = 0; | |
634 | ||
635 | ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); | |
636 | if (ret) { | |
637 | if (err_ret) | |
638 | *err_ret = ret; | |
639 | return 0xFF; | |
640 | } | |
641 | ||
642 | return val; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(sdio_f0_readb); | |
645 | ||
646 | /** | |
647 | * sdio_f0_writeb - write a single byte to SDIO function 0 | |
648 | * @func: an SDIO function of the card | |
649 | * @b: byte to write | |
650 | * @addr: address to write to | |
651 | * @err_ret: optional status value from transfer | |
652 | * | |
653 | * Writes a single byte to the address space of SDIO function 0. | |
654 | * @err_ret will contain the status of the actual transfer. | |
655 | * | |
656 | * Only writes to the vendor specific CCCR registers (0xF0 - | |
657 | * 0xFF) are permiited; @err_ret will be set to -EINVAL for * | |
658 | * writes outside this range. | |
659 | */ | |
660 | void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, | |
661 | int *err_ret) | |
662 | { | |
663 | int ret; | |
664 | ||
665 | BUG_ON(!func); | |
666 | ||
7c979ec7 | 667 | if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
7806cdb4 DV |
668 | if (err_ret) |
669 | *err_ret = -EINVAL; | |
670 | return; | |
671 | } | |
672 | ||
673 | ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL); | |
674 | if (err_ret) | |
675 | *err_ret = ret; | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(sdio_f0_writeb); | |
da68c4eb NP |
678 | |
679 | /** | |
680 | * sdio_get_host_pm_caps - get host power management capabilities | |
681 | * @func: SDIO function attached to host | |
682 | * | |
683 | * Returns a capability bitmask corresponding to power management | |
684 | * features supported by the host controller that the card function | |
685 | * might rely upon during a system suspend. The host doesn't need | |
686 | * to be claimed, nor the function active, for this information to be | |
687 | * obtained. | |
688 | */ | |
689 | mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) | |
690 | { | |
691 | BUG_ON(!func); | |
692 | BUG_ON(!func->card); | |
693 | ||
694 | return func->card->host->pm_caps; | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); | |
697 | ||
698 | /** | |
699 | * sdio_set_host_pm_flags - set wanted host power management capabilities | |
700 | * @func: SDIO function attached to host | |
701 | * | |
702 | * Set a capability bitmask corresponding to wanted host controller | |
703 | * power management features for the upcoming suspend state. | |
704 | * This must be called, if needed, each time the suspend method of | |
705 | * the function driver is called, and must contain only bits that | |
706 | * were returned by sdio_get_host_pm_caps(). | |
707 | * The host doesn't need to be claimed, nor the function active, | |
708 | * for this information to be set. | |
709 | */ | |
710 | int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) | |
711 | { | |
712 | struct mmc_host *host; | |
713 | ||
714 | BUG_ON(!func); | |
715 | BUG_ON(!func->card); | |
716 | ||
717 | host = func->card->host; | |
718 | ||
719 | if (flags & ~host->pm_caps) | |
720 | return -EINVAL; | |
721 | ||
722 | /* function suspend methods are serialized, hence no lock needed */ | |
723 | host->pm_flags |= flags; | |
724 | return 0; | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); |