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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" | |
55244c56 | 19 | #include "core.h" |
4facdde1 | 20 | #include "card.h" |
46f555f2 PO |
21 | |
22 | /** | |
23 | * sdio_claim_host - exclusively claim a bus for a certain SDIO function | |
24 | * @func: SDIO function that will be accessed | |
25 | * | |
26 | * Claim a bus for a set of operations. The SDIO function given | |
27 | * is used to figure out which bus is relevant. | |
28 | */ | |
29 | void sdio_claim_host(struct sdio_func *func) | |
30 | { | |
923dff87 SL |
31 | if (WARN_ON(!func)) |
32 | return; | |
46f555f2 PO |
33 | |
34 | mmc_claim_host(func->card->host); | |
35 | } | |
36 | EXPORT_SYMBOL_GPL(sdio_claim_host); | |
37 | ||
38 | /** | |
39 | * sdio_release_host - release a bus for a certain SDIO function | |
40 | * @func: SDIO function that was accessed | |
41 | * | |
42 | * Release a bus, allowing others to claim the bus for their | |
43 | * operations. | |
44 | */ | |
45 | void sdio_release_host(struct sdio_func *func) | |
46 | { | |
923dff87 SL |
47 | if (WARN_ON(!func)) |
48 | return; | |
46f555f2 PO |
49 | |
50 | mmc_release_host(func->card->host); | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(sdio_release_host); | |
53 | ||
fa64efa1 PO |
54 | /** |
55 | * sdio_enable_func - enables a SDIO function for usage | |
56 | * @func: SDIO function to enable | |
57 | * | |
58 | * Powers up and activates a SDIO function so that register | |
59 | * access is possible. | |
60 | */ | |
61 | int sdio_enable_func(struct sdio_func *func) | |
62 | { | |
63 | int ret; | |
64 | unsigned char reg; | |
65 | unsigned long timeout; | |
66 | ||
923dff87 SL |
67 | if (!func) |
68 | return -EINVAL; | |
fa64efa1 PO |
69 | |
70 | pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func)); | |
71 | ||
72 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
73 | if (ret) | |
74 | goto err; | |
75 | ||
76 | reg |= 1 << func->num; | |
77 | ||
78 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
79 | if (ret) | |
80 | goto err; | |
81 | ||
62a7573e | 82 | timeout = jiffies + msecs_to_jiffies(func->enable_timeout); |
fa64efa1 PO |
83 | |
84 | while (1) { | |
85 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®); | |
86 | if (ret) | |
87 | goto err; | |
88 | if (reg & (1 << func->num)) | |
89 | break; | |
90 | ret = -ETIME; | |
91 | if (time_after(jiffies, timeout)) | |
92 | goto err; | |
93 | } | |
94 | ||
95 | pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func)); | |
96 | ||
97 | return 0; | |
98 | ||
99 | err: | |
100 | pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func)); | |
101 | return ret; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(sdio_enable_func); | |
104 | ||
105 | /** | |
106 | * sdio_disable_func - disable a SDIO function | |
107 | * @func: SDIO function to disable | |
108 | * | |
109 | * Powers down and deactivates a SDIO function. Register access | |
110 | * to this function will fail until the function is reenabled. | |
111 | */ | |
112 | int sdio_disable_func(struct sdio_func *func) | |
113 | { | |
114 | int ret; | |
115 | unsigned char reg; | |
116 | ||
923dff87 SL |
117 | if (!func) |
118 | return -EINVAL; | |
fa64efa1 PO |
119 | |
120 | pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func)); | |
121 | ||
122 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®); | |
123 | if (ret) | |
124 | goto err; | |
125 | ||
126 | reg &= ~(1 << func->num); | |
127 | ||
128 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL); | |
129 | if (ret) | |
130 | goto err; | |
131 | ||
132 | pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func)); | |
133 | ||
134 | return 0; | |
135 | ||
136 | err: | |
137 | pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func)); | |
138 | return -EIO; | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(sdio_disable_func); | |
141 | ||
9a08f82b DV |
142 | /** |
143 | * sdio_set_block_size - set the block size of an SDIO function | |
144 | * @func: SDIO function to change | |
145 | * @blksz: new block size or 0 to use the default. | |
146 | * | |
147 | * The default block size is the largest supported by both the function | |
148 | * and the host, with a maximum of 512 to ensure that arbitrarily sized | |
149 | * data transfer use the optimal (least) number of commands. | |
150 | * | |
151 | * A driver may call this to override the default block size set by the | |
152 | * core. This can be used to set a block size greater than the maximum | |
153 | * that reported by the card; it is the driver's responsibility to ensure | |
154 | * it uses a value that the card supports. | |
155 | * | |
156 | * Returns 0 on success, -EINVAL if the host does not support the | |
157 | * requested block size, or -EIO (etc.) if one of the resultant FBR block | |
158 | * size register writes failed. | |
159 | * | |
160 | */ | |
161 | int sdio_set_block_size(struct sdio_func *func, unsigned blksz) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | if (blksz > func->card->host->max_blk_size) | |
166 | return -EINVAL; | |
167 | ||
168 | if (blksz == 0) { | |
6d373331 TW |
169 | blksz = min(func->max_blksize, func->card->host->max_blk_size); |
170 | blksz = min(blksz, 512u); | |
9a08f82b DV |
171 | } |
172 | ||
173 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
174 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE, | |
175 | blksz & 0xff, NULL); | |
176 | if (ret) | |
177 | return ret; | |
178 | ret = mmc_io_rw_direct(func->card, 1, 0, | |
179 | SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1, | |
180 | (blksz >> 8) & 0xff, NULL); | |
181 | if (ret) | |
182 | return ret; | |
183 | func->cur_blksize = blksz; | |
184 | return 0; | |
185 | } | |
9a08f82b DV |
186 | EXPORT_SYMBOL_GPL(sdio_set_block_size); |
187 | ||
eea0f581 PO |
188 | /* |
189 | * Calculate the maximum byte mode transfer size | |
190 | */ | |
191 | static inline unsigned int sdio_max_byte_size(struct sdio_func *func) | |
192 | { | |
968a64ea | 193 | unsigned mval = func->card->host->max_blk_size; |
3fb7fb4a BZ |
194 | |
195 | if (mmc_blksz_for_byte_mode(func->card)) | |
196 | mval = min(mval, func->cur_blksize); | |
197 | else | |
198 | mval = min(mval, func->max_blksize); | |
199 | ||
052d81da SNX |
200 | if (mmc_card_broken_byte_mode_512(func->card)) |
201 | return min(mval, 511u); | |
202 | ||
ea901300 | 203 | return min(mval, 512u); /* maximum size for byte mode */ |
eea0f581 PO |
204 | } |
205 | ||
ad3868b2 PO |
206 | /** |
207 | * sdio_align_size - pads a transfer size to a more optimal value | |
208 | * @func: SDIO function | |
209 | * @sz: original transfer size | |
210 | * | |
211 | * Pads the original data size with a number of extra bytes in | |
212 | * order to avoid controller bugs and/or performance hits | |
213 | * (e.g. some controllers revert to PIO for certain sizes). | |
214 | * | |
215 | * If possible, it will also adjust the size so that it can be | |
216 | * handled in just a single request. | |
217 | * | |
218 | * Returns the improved size, which might be unmodified. | |
219 | */ | |
220 | unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) | |
221 | { | |
222 | unsigned int orig_sz; | |
223 | unsigned int blk_sz, byte_sz; | |
224 | unsigned chunk_sz; | |
225 | ||
226 | orig_sz = sz; | |
227 | ||
228 | /* | |
229 | * Do a first check with the controller, in case it | |
230 | * wants to increase the size up to a point where it | |
231 | * might need more than one block. | |
232 | */ | |
233 | sz = mmc_align_data_size(func->card, sz); | |
234 | ||
235 | /* | |
236 | * If we can still do this with just a byte transfer, then | |
237 | * we're done. | |
238 | */ | |
eea0f581 | 239 | if (sz <= sdio_max_byte_size(func)) |
ad3868b2 PO |
240 | return sz; |
241 | ||
242 | if (func->card->cccr.multi_block) { | |
243 | /* | |
244 | * Check if the transfer is already block aligned | |
245 | */ | |
246 | if ((sz % func->cur_blksize) == 0) | |
247 | return sz; | |
248 | ||
249 | /* | |
250 | * Realign it so that it can be done with one request, | |
251 | * and recheck if the controller still likes it. | |
252 | */ | |
253 | blk_sz = ((sz + func->cur_blksize - 1) / | |
254 | func->cur_blksize) * func->cur_blksize; | |
255 | blk_sz = mmc_align_data_size(func->card, blk_sz); | |
256 | ||
257 | /* | |
258 | * This value is only good if it is still just | |
259 | * one request. | |
260 | */ | |
261 | if ((blk_sz % func->cur_blksize) == 0) | |
262 | return blk_sz; | |
263 | ||
264 | /* | |
265 | * We failed to do one request, but at least try to | |
266 | * pad the remainder properly. | |
267 | */ | |
268 | byte_sz = mmc_align_data_size(func->card, | |
269 | sz % func->cur_blksize); | |
eea0f581 | 270 | if (byte_sz <= sdio_max_byte_size(func)) { |
ad3868b2 PO |
271 | blk_sz = sz / func->cur_blksize; |
272 | return blk_sz * func->cur_blksize + byte_sz; | |
273 | } | |
274 | } else { | |
275 | /* | |
276 | * We need multiple requests, so first check that the | |
277 | * controller can handle the chunk size; | |
278 | */ | |
279 | chunk_sz = mmc_align_data_size(func->card, | |
eea0f581 PO |
280 | sdio_max_byte_size(func)); |
281 | if (chunk_sz == sdio_max_byte_size(func)) { | |
ad3868b2 PO |
282 | /* |
283 | * Fix up the size of the remainder (if any) | |
284 | */ | |
285 | byte_sz = orig_sz % chunk_sz; | |
286 | if (byte_sz) { | |
287 | byte_sz = mmc_align_data_size(func->card, | |
288 | byte_sz); | |
289 | } | |
290 | ||
291 | return (orig_sz / chunk_sz) * chunk_sz + byte_sz; | |
292 | } | |
293 | } | |
294 | ||
295 | /* | |
296 | * The controller is simply incapable of transferring the size | |
297 | * we want in decent manner, so just return the original size. | |
298 | */ | |
299 | return orig_sz; | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(sdio_align_size); | |
302 | ||
eb659468 DV |
303 | /* Split an arbitrarily sized data transfer into several |
304 | * IO_RW_EXTENDED commands. */ | |
305 | static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, | |
306 | unsigned addr, int incr_addr, u8 *buf, unsigned size) | |
307 | { | |
308 | unsigned remainder = size; | |
309 | unsigned max_blocks; | |
310 | int ret; | |
311 | ||
923dff87 SL |
312 | if (!func || (func->num > 7)) |
313 | return -EINVAL; | |
314 | ||
eb659468 | 315 | /* Do the bulk of the transfer using block mode (if supported). */ |
eea0f581 | 316 | if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) { |
eb659468 | 317 | /* Blocks per command is limited by host count, host transfer |
968a64ea KK |
318 | * size and the maximum for IO_RW_EXTENDED of 511 blocks. */ |
319 | max_blocks = min(func->card->host->max_blk_count, 511u); | |
eb659468 | 320 | |
052d81da | 321 | while (remainder >= func->cur_blksize) { |
eb659468 DV |
322 | unsigned blocks; |
323 | ||
324 | blocks = remainder / func->cur_blksize; | |
325 | if (blocks > max_blocks) | |
326 | blocks = max_blocks; | |
327 | size = blocks * func->cur_blksize; | |
328 | ||
329 | ret = mmc_io_rw_extended(func->card, write, | |
330 | func->num, addr, incr_addr, buf, | |
331 | blocks, func->cur_blksize); | |
332 | if (ret) | |
333 | return ret; | |
334 | ||
335 | remainder -= size; | |
336 | buf += size; | |
337 | if (incr_addr) | |
338 | addr += size; | |
339 | } | |
340 | } | |
341 | ||
342 | /* Write the remainder using byte mode. */ | |
343 | while (remainder > 0) { | |
eea0f581 | 344 | size = min(remainder, sdio_max_byte_size(func)); |
eb659468 | 345 | |
052d81da | 346 | /* Indicate byte mode by setting "blocks" = 0 */ |
eb659468 | 347 | ret = mmc_io_rw_extended(func->card, write, func->num, addr, |
052d81da | 348 | incr_addr, buf, 0, size); |
eb659468 DV |
349 | if (ret) |
350 | return ret; | |
351 | ||
352 | remainder -= size; | |
353 | buf += size; | |
354 | if (incr_addr) | |
355 | addr += size; | |
356 | } | |
357 | return 0; | |
358 | } | |
359 | ||
46f555f2 PO |
360 | /** |
361 | * sdio_readb - read a single byte from a SDIO function | |
362 | * @func: SDIO function to access | |
363 | * @addr: address to read | |
364 | * @err_ret: optional status value from transfer | |
365 | * | |
366 | * Reads a single byte from the address space of a given SDIO | |
367 | * function. If there is a problem reading the address, 0xff | |
368 | * is returned and @err_ret will contain the error code. | |
369 | */ | |
6d373331 | 370 | u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
46f555f2 PO |
371 | { |
372 | int ret; | |
6d373331 | 373 | u8 val; |
46f555f2 | 374 | |
923dff87 SL |
375 | if (!func) { |
376 | *err_ret = -EINVAL; | |
377 | return 0xFF; | |
378 | } | |
46f555f2 PO |
379 | |
380 | if (err_ret) | |
381 | *err_ret = 0; | |
382 | ||
383 | ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); | |
384 | if (ret) { | |
385 | if (err_ret) | |
386 | *err_ret = ret; | |
387 | return 0xFF; | |
388 | } | |
389 | ||
390 | return val; | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(sdio_readb); | |
393 | ||
394 | /** | |
395 | * sdio_writeb - write a single byte to a SDIO function | |
396 | * @func: SDIO function to access | |
397 | * @b: byte to write | |
398 | * @addr: address to write to | |
399 | * @err_ret: optional status value from transfer | |
400 | * | |
401 | * Writes a single byte to the address space of a given SDIO | |
402 | * function. @err_ret will contain the status of the actual | |
403 | * transfer. | |
404 | */ | |
6d373331 | 405 | void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret) |
46f555f2 PO |
406 | { |
407 | int ret; | |
408 | ||
923dff87 SL |
409 | if (!func) { |
410 | *err_ret = -EINVAL; | |
411 | return; | |
412 | } | |
46f555f2 PO |
413 | |
414 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); | |
415 | if (err_ret) | |
416 | *err_ret = ret; | |
417 | } | |
418 | EXPORT_SYMBOL_GPL(sdio_writeb); | |
419 | ||
6c1f716e GI |
420 | /** |
421 | * sdio_writeb_readb - write and read a byte from SDIO function | |
422 | * @func: SDIO function to access | |
423 | * @write_byte: byte to write | |
424 | * @addr: address to write to | |
425 | * @err_ret: optional status value from transfer | |
426 | * | |
427 | * Performs a RAW (Read after Write) operation as defined by SDIO spec - | |
428 | * single byte is written to address space of a given SDIO function and | |
429 | * response is read back from the same address, both using single request. | |
430 | * If there is a problem with the operation, 0xff is returned and | |
431 | * @err_ret will contain the error code. | |
432 | */ | |
433 | u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, | |
434 | unsigned int addr, int *err_ret) | |
435 | { | |
436 | int ret; | |
437 | u8 val; | |
438 | ||
439 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, | |
440 | write_byte, &val); | |
441 | if (err_ret) | |
442 | *err_ret = ret; | |
443 | if (ret) | |
444 | val = 0xff; | |
445 | ||
446 | return val; | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(sdio_writeb_readb); | |
449 | ||
112c9db9 PO |
450 | /** |
451 | * sdio_memcpy_fromio - read a chunk of memory from a SDIO function | |
452 | * @func: SDIO function to access | |
453 | * @dst: buffer to store the data | |
454 | * @addr: address to begin reading from | |
455 | * @count: number of bytes to read | |
456 | * | |
eb659468 DV |
457 | * Reads from the address space of a given SDIO function. Return |
458 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
459 | */ |
460 | int sdio_memcpy_fromio(struct sdio_func *func, void *dst, | |
461 | unsigned int addr, int count) | |
462 | { | |
eb659468 | 463 | return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count); |
112c9db9 PO |
464 | } |
465 | EXPORT_SYMBOL_GPL(sdio_memcpy_fromio); | |
466 | ||
467 | /** | |
468 | * sdio_memcpy_toio - write a chunk of memory to a SDIO function | |
469 | * @func: SDIO function to access | |
470 | * @addr: address to start writing to | |
471 | * @src: buffer that contains the data to write | |
472 | * @count: number of bytes to write | |
473 | * | |
eb659468 DV |
474 | * Writes to the address space of a given SDIO function. Return |
475 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
476 | */ |
477 | int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, | |
478 | void *src, int count) | |
479 | { | |
eb659468 | 480 | return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count); |
112c9db9 PO |
481 | } |
482 | EXPORT_SYMBOL_GPL(sdio_memcpy_toio); | |
483 | ||
484 | /** | |
485 | * sdio_readsb - read from a FIFO on a SDIO function | |
486 | * @func: SDIO function to access | |
487 | * @dst: buffer to store the data | |
488 | * @addr: address of (single byte) FIFO | |
489 | * @count: number of bytes to read | |
490 | * | |
eb659468 DV |
491 | * Reads from the specified FIFO of a given SDIO function. Return |
492 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
493 | */ |
494 | int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr, | |
495 | int count) | |
496 | { | |
eb659468 | 497 | return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count); |
112c9db9 | 498 | } |
112c9db9 PO |
499 | EXPORT_SYMBOL_GPL(sdio_readsb); |
500 | ||
501 | /** | |
502 | * sdio_writesb - write to a FIFO of a SDIO function | |
503 | * @func: SDIO function to access | |
504 | * @addr: address of (single byte) FIFO | |
505 | * @src: buffer that contains the data to write | |
506 | * @count: number of bytes to write | |
507 | * | |
eb659468 DV |
508 | * Writes to the specified FIFO of a given SDIO function. Return |
509 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
510 | */ |
511 | int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src, | |
512 | int count) | |
513 | { | |
eb659468 | 514 | return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count); |
112c9db9 PO |
515 | } |
516 | EXPORT_SYMBOL_GPL(sdio_writesb); | |
517 | ||
518 | /** | |
519 | * sdio_readw - read a 16 bit integer from a SDIO function | |
520 | * @func: SDIO function to access | |
521 | * @addr: address to read | |
522 | * @err_ret: optional status value from transfer | |
523 | * | |
524 | * Reads a 16 bit integer from the address space of a given SDIO | |
525 | * function. If there is a problem reading the address, 0xffff | |
526 | * is returned and @err_ret will contain the error code. | |
527 | */ | |
6d373331 | 528 | u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
529 | { |
530 | int ret; | |
531 | ||
532 | if (err_ret) | |
533 | *err_ret = 0; | |
534 | ||
535 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); | |
536 | if (ret) { | |
537 | if (err_ret) | |
538 | *err_ret = ret; | |
539 | return 0xFFFF; | |
540 | } | |
541 | ||
6d373331 | 542 | return le16_to_cpup((__le16 *)func->tmpbuf); |
112c9db9 PO |
543 | } |
544 | EXPORT_SYMBOL_GPL(sdio_readw); | |
545 | ||
546 | /** | |
547 | * sdio_writew - write a 16 bit integer to a SDIO function | |
548 | * @func: SDIO function to access | |
549 | * @b: integer to write | |
550 | * @addr: address to write to | |
551 | * @err_ret: optional status value from transfer | |
552 | * | |
553 | * Writes a 16 bit integer to the address space of a given SDIO | |
554 | * function. @err_ret will contain the status of the actual | |
555 | * transfer. | |
556 | */ | |
6d373331 | 557 | void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
558 | { |
559 | int ret; | |
560 | ||
6d373331 | 561 | *(__le16 *)func->tmpbuf = cpu_to_le16(b); |
112c9db9 PO |
562 | |
563 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2); | |
564 | if (err_ret) | |
565 | *err_ret = ret; | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(sdio_writew); | |
568 | ||
569 | /** | |
570 | * sdio_readl - read a 32 bit integer from a SDIO function | |
571 | * @func: SDIO function to access | |
572 | * @addr: address to read | |
573 | * @err_ret: optional status value from transfer | |
574 | * | |
575 | * Reads a 32 bit integer from the address space of a given SDIO | |
576 | * function. If there is a problem reading the address, | |
577 | * 0xffffffff is returned and @err_ret will contain the error | |
578 | * code. | |
579 | */ | |
6d373331 | 580 | u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
581 | { |
582 | int ret; | |
583 | ||
584 | if (err_ret) | |
585 | *err_ret = 0; | |
586 | ||
587 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); | |
588 | if (ret) { | |
589 | if (err_ret) | |
590 | *err_ret = ret; | |
591 | return 0xFFFFFFFF; | |
592 | } | |
593 | ||
6d373331 | 594 | return le32_to_cpup((__le32 *)func->tmpbuf); |
112c9db9 PO |
595 | } |
596 | EXPORT_SYMBOL_GPL(sdio_readl); | |
597 | ||
598 | /** | |
599 | * sdio_writel - write a 32 bit integer to a SDIO function | |
600 | * @func: SDIO function to access | |
601 | * @b: integer to write | |
602 | * @addr: address to write to | |
603 | * @err_ret: optional status value from transfer | |
604 | * | |
605 | * Writes a 32 bit integer to the address space of a given SDIO | |
606 | * function. @err_ret will contain the status of the actual | |
607 | * transfer. | |
608 | */ | |
6d373331 | 609 | void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
610 | { |
611 | int ret; | |
612 | ||
6d373331 | 613 | *(__le32 *)func->tmpbuf = cpu_to_le32(b); |
112c9db9 PO |
614 | |
615 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4); | |
616 | if (err_ret) | |
617 | *err_ret = ret; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(sdio_writel); | |
620 | ||
7806cdb4 DV |
621 | /** |
622 | * sdio_f0_readb - read a single byte from SDIO function 0 | |
623 | * @func: an SDIO function of the card | |
624 | * @addr: address to read | |
625 | * @err_ret: optional status value from transfer | |
626 | * | |
627 | * Reads a single byte from the address space of SDIO function 0. | |
628 | * If there is a problem reading the address, 0xff is returned | |
629 | * and @err_ret will contain the error code. | |
630 | */ | |
631 | unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, | |
632 | int *err_ret) | |
633 | { | |
634 | int ret; | |
635 | unsigned char val; | |
636 | ||
923dff87 SL |
637 | if (!func) { |
638 | *err_ret = -EINVAL; | |
639 | return 0xFF; | |
640 | } | |
7806cdb4 DV |
641 | |
642 | if (err_ret) | |
643 | *err_ret = 0; | |
644 | ||
645 | ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); | |
646 | if (ret) { | |
647 | if (err_ret) | |
648 | *err_ret = ret; | |
649 | return 0xFF; | |
650 | } | |
651 | ||
652 | return val; | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(sdio_f0_readb); | |
655 | ||
656 | /** | |
657 | * sdio_f0_writeb - write a single byte to SDIO function 0 | |
658 | * @func: an SDIO function of the card | |
659 | * @b: byte to write | |
660 | * @addr: address to write to | |
661 | * @err_ret: optional status value from transfer | |
662 | * | |
663 | * Writes a single byte to the address space of SDIO function 0. | |
664 | * @err_ret will contain the status of the actual transfer. | |
665 | * | |
666 | * Only writes to the vendor specific CCCR registers (0xF0 - | |
667 | * 0xFF) are permiited; @err_ret will be set to -EINVAL for * | |
668 | * writes outside this range. | |
669 | */ | |
670 | void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, | |
671 | int *err_ret) | |
672 | { | |
673 | int ret; | |
674 | ||
923dff87 SL |
675 | if (!func) { |
676 | *err_ret = -EINVAL; | |
677 | return; | |
678 | } | |
7806cdb4 | 679 | |
7c979ec7 | 680 | if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
7806cdb4 DV |
681 | if (err_ret) |
682 | *err_ret = -EINVAL; | |
683 | return; | |
684 | } | |
685 | ||
686 | ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL); | |
687 | if (err_ret) | |
688 | *err_ret = ret; | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(sdio_f0_writeb); | |
da68c4eb NP |
691 | |
692 | /** | |
693 | * sdio_get_host_pm_caps - get host power management capabilities | |
694 | * @func: SDIO function attached to host | |
695 | * | |
696 | * Returns a capability bitmask corresponding to power management | |
697 | * features supported by the host controller that the card function | |
698 | * might rely upon during a system suspend. The host doesn't need | |
699 | * to be claimed, nor the function active, for this information to be | |
700 | * obtained. | |
701 | */ | |
702 | mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) | |
703 | { | |
923dff87 SL |
704 | if (!func) |
705 | return 0; | |
da68c4eb NP |
706 | |
707 | return func->card->host->pm_caps; | |
708 | } | |
709 | EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); | |
710 | ||
711 | /** | |
712 | * sdio_set_host_pm_flags - set wanted host power management capabilities | |
713 | * @func: SDIO function attached to host | |
714 | * | |
715 | * Set a capability bitmask corresponding to wanted host controller | |
716 | * power management features for the upcoming suspend state. | |
717 | * This must be called, if needed, each time the suspend method of | |
718 | * the function driver is called, and must contain only bits that | |
719 | * were returned by sdio_get_host_pm_caps(). | |
720 | * The host doesn't need to be claimed, nor the function active, | |
721 | * for this information to be set. | |
722 | */ | |
723 | int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) | |
724 | { | |
725 | struct mmc_host *host; | |
726 | ||
923dff87 SL |
727 | if (!func) |
728 | return -EINVAL; | |
da68c4eb NP |
729 | |
730 | host = func->card->host; | |
731 | ||
732 | if (flags & ~host->pm_caps) | |
733 | return -EINVAL; | |
734 | ||
735 | /* function suspend methods are serialized, hence no lock needed */ | |
736 | host->pm_flags |= flags; | |
737 | return 0; | |
738 | } | |
739 | EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); |