Commit | Line | Data |
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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 | { | |
be1f970b SL |
29 | if (WARN_ON(!func)) |
30 | return; | |
46f555f2 PO |
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 | { | |
be1f970b SL |
45 | if (WARN_ON(!func)) |
46 | return; | |
46f555f2 PO |
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 | ||
be1f970b SL |
65 | if (!func) |
66 | return -EINVAL; | |
fa64efa1 PO |
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 | ||
be1f970b SL |
115 | if (!func) |
116 | return -EINVAL; | |
fa64efa1 PO |
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 | { | |
968a64ea | 191 | unsigned mval = 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 | ||
052d81da SNX |
198 | if (mmc_card_broken_byte_mode_512(func->card)) |
199 | return min(mval, 511u); | |
200 | ||
ea901300 | 201 | return min(mval, 512u); /* maximum size for byte mode */ |
eea0f581 PO |
202 | } |
203 | ||
ad3868b2 PO |
204 | /** |
205 | * sdio_align_size - pads a transfer size to a more optimal value | |
206 | * @func: SDIO function | |
207 | * @sz: original transfer size | |
208 | * | |
209 | * Pads the original data size with a number of extra bytes in | |
210 | * order to avoid controller bugs and/or performance hits | |
211 | * (e.g. some controllers revert to PIO for certain sizes). | |
212 | * | |
213 | * If possible, it will also adjust the size so that it can be | |
214 | * handled in just a single request. | |
215 | * | |
216 | * Returns the improved size, which might be unmodified. | |
217 | */ | |
218 | unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) | |
219 | { | |
220 | unsigned int orig_sz; | |
221 | unsigned int blk_sz, byte_sz; | |
222 | unsigned chunk_sz; | |
223 | ||
224 | orig_sz = sz; | |
225 | ||
226 | /* | |
227 | * Do a first check with the controller, in case it | |
228 | * wants to increase the size up to a point where it | |
229 | * might need more than one block. | |
230 | */ | |
231 | sz = mmc_align_data_size(func->card, sz); | |
232 | ||
233 | /* | |
234 | * If we can still do this with just a byte transfer, then | |
235 | * we're done. | |
236 | */ | |
eea0f581 | 237 | if (sz <= sdio_max_byte_size(func)) |
ad3868b2 PO |
238 | return sz; |
239 | ||
240 | if (func->card->cccr.multi_block) { | |
241 | /* | |
242 | * Check if the transfer is already block aligned | |
243 | */ | |
244 | if ((sz % func->cur_blksize) == 0) | |
245 | return sz; | |
246 | ||
247 | /* | |
248 | * Realign it so that it can be done with one request, | |
249 | * and recheck if the controller still likes it. | |
250 | */ | |
251 | blk_sz = ((sz + func->cur_blksize - 1) / | |
252 | func->cur_blksize) * func->cur_blksize; | |
253 | blk_sz = mmc_align_data_size(func->card, blk_sz); | |
254 | ||
255 | /* | |
256 | * This value is only good if it is still just | |
257 | * one request. | |
258 | */ | |
259 | if ((blk_sz % func->cur_blksize) == 0) | |
260 | return blk_sz; | |
261 | ||
262 | /* | |
263 | * We failed to do one request, but at least try to | |
264 | * pad the remainder properly. | |
265 | */ | |
266 | byte_sz = mmc_align_data_size(func->card, | |
267 | sz % func->cur_blksize); | |
eea0f581 | 268 | if (byte_sz <= sdio_max_byte_size(func)) { |
ad3868b2 PO |
269 | blk_sz = sz / func->cur_blksize; |
270 | return blk_sz * func->cur_blksize + byte_sz; | |
271 | } | |
272 | } else { | |
273 | /* | |
274 | * We need multiple requests, so first check that the | |
275 | * controller can handle the chunk size; | |
276 | */ | |
277 | chunk_sz = mmc_align_data_size(func->card, | |
eea0f581 PO |
278 | sdio_max_byte_size(func)); |
279 | if (chunk_sz == sdio_max_byte_size(func)) { | |
ad3868b2 PO |
280 | /* |
281 | * Fix up the size of the remainder (if any) | |
282 | */ | |
283 | byte_sz = orig_sz % chunk_sz; | |
284 | if (byte_sz) { | |
285 | byte_sz = mmc_align_data_size(func->card, | |
286 | byte_sz); | |
287 | } | |
288 | ||
289 | return (orig_sz / chunk_sz) * chunk_sz + byte_sz; | |
290 | } | |
291 | } | |
292 | ||
293 | /* | |
294 | * The controller is simply incapable of transferring the size | |
295 | * we want in decent manner, so just return the original size. | |
296 | */ | |
297 | return orig_sz; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(sdio_align_size); | |
300 | ||
eb659468 DV |
301 | /* Split an arbitrarily sized data transfer into several |
302 | * IO_RW_EXTENDED commands. */ | |
303 | static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, | |
304 | unsigned addr, int incr_addr, u8 *buf, unsigned size) | |
305 | { | |
306 | unsigned remainder = size; | |
307 | unsigned max_blocks; | |
308 | int ret; | |
309 | ||
be1f970b SL |
310 | if (!func || (func->num > 7)) |
311 | return -EINVAL; | |
312 | ||
eb659468 | 313 | /* Do the bulk of the transfer using block mode (if supported). */ |
eea0f581 | 314 | if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) { |
eb659468 | 315 | /* Blocks per command is limited by host count, host transfer |
968a64ea KK |
316 | * size and the maximum for IO_RW_EXTENDED of 511 blocks. */ |
317 | max_blocks = min(func->card->host->max_blk_count, 511u); | |
eb659468 | 318 | |
052d81da | 319 | while (remainder >= func->cur_blksize) { |
eb659468 DV |
320 | unsigned blocks; |
321 | ||
322 | blocks = remainder / func->cur_blksize; | |
323 | if (blocks > max_blocks) | |
324 | blocks = max_blocks; | |
325 | size = blocks * func->cur_blksize; | |
326 | ||
327 | ret = mmc_io_rw_extended(func->card, write, | |
328 | func->num, addr, incr_addr, buf, | |
329 | blocks, func->cur_blksize); | |
330 | if (ret) | |
331 | return ret; | |
332 | ||
333 | remainder -= size; | |
334 | buf += size; | |
335 | if (incr_addr) | |
336 | addr += size; | |
337 | } | |
338 | } | |
339 | ||
340 | /* Write the remainder using byte mode. */ | |
341 | while (remainder > 0) { | |
eea0f581 | 342 | size = min(remainder, sdio_max_byte_size(func)); |
eb659468 | 343 | |
052d81da | 344 | /* Indicate byte mode by setting "blocks" = 0 */ |
eb659468 | 345 | ret = mmc_io_rw_extended(func->card, write, func->num, addr, |
052d81da | 346 | incr_addr, buf, 0, size); |
eb659468 DV |
347 | if (ret) |
348 | return ret; | |
349 | ||
350 | remainder -= size; | |
351 | buf += size; | |
352 | if (incr_addr) | |
353 | addr += size; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
46f555f2 PO |
358 | /** |
359 | * sdio_readb - read a single byte from a SDIO function | |
360 | * @func: SDIO function to access | |
361 | * @addr: address to read | |
362 | * @err_ret: optional status value from transfer | |
363 | * | |
364 | * Reads a single byte from the address space of a given SDIO | |
365 | * function. If there is a problem reading the address, 0xff | |
366 | * is returned and @err_ret will contain the error code. | |
367 | */ | |
6d373331 | 368 | u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
46f555f2 PO |
369 | { |
370 | int ret; | |
6d373331 | 371 | u8 val; |
46f555f2 | 372 | |
be1f970b SL |
373 | if (!func) { |
374 | *err_ret = -EINVAL; | |
375 | return 0xFF; | |
376 | } | |
46f555f2 PO |
377 | |
378 | if (err_ret) | |
379 | *err_ret = 0; | |
380 | ||
381 | ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); | |
382 | if (ret) { | |
383 | if (err_ret) | |
384 | *err_ret = ret; | |
385 | return 0xFF; | |
386 | } | |
387 | ||
388 | return val; | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(sdio_readb); | |
391 | ||
392 | /** | |
393 | * sdio_writeb - write a single byte to a SDIO function | |
394 | * @func: SDIO function to access | |
395 | * @b: byte to write | |
396 | * @addr: address to write to | |
397 | * @err_ret: optional status value from transfer | |
398 | * | |
399 | * Writes a single byte to the address space of a given SDIO | |
400 | * function. @err_ret will contain the status of the actual | |
401 | * transfer. | |
402 | */ | |
6d373331 | 403 | void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret) |
46f555f2 PO |
404 | { |
405 | int ret; | |
406 | ||
be1f970b SL |
407 | if (!func) { |
408 | *err_ret = -EINVAL; | |
409 | return; | |
410 | } | |
46f555f2 PO |
411 | |
412 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); | |
413 | if (err_ret) | |
414 | *err_ret = ret; | |
415 | } | |
416 | EXPORT_SYMBOL_GPL(sdio_writeb); | |
417 | ||
6c1f716e GI |
418 | /** |
419 | * sdio_writeb_readb - write and read a byte from SDIO function | |
420 | * @func: SDIO function to access | |
421 | * @write_byte: byte to write | |
422 | * @addr: address to write to | |
423 | * @err_ret: optional status value from transfer | |
424 | * | |
425 | * Performs a RAW (Read after Write) operation as defined by SDIO spec - | |
426 | * single byte is written to address space of a given SDIO function and | |
427 | * response is read back from the same address, both using single request. | |
428 | * If there is a problem with the operation, 0xff is returned and | |
429 | * @err_ret will contain the error code. | |
430 | */ | |
431 | u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, | |
432 | unsigned int addr, int *err_ret) | |
433 | { | |
434 | int ret; | |
435 | u8 val; | |
436 | ||
437 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, | |
438 | write_byte, &val); | |
439 | if (err_ret) | |
440 | *err_ret = ret; | |
441 | if (ret) | |
442 | val = 0xff; | |
443 | ||
444 | return val; | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(sdio_writeb_readb); | |
447 | ||
112c9db9 PO |
448 | /** |
449 | * sdio_memcpy_fromio - read a chunk of memory from a SDIO function | |
450 | * @func: SDIO function to access | |
451 | * @dst: buffer to store the data | |
452 | * @addr: address to begin reading from | |
453 | * @count: number of bytes to read | |
454 | * | |
eb659468 DV |
455 | * Reads from the address space of a given SDIO function. Return |
456 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
457 | */ |
458 | int sdio_memcpy_fromio(struct sdio_func *func, void *dst, | |
459 | unsigned int addr, int count) | |
460 | { | |
eb659468 | 461 | return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count); |
112c9db9 PO |
462 | } |
463 | EXPORT_SYMBOL_GPL(sdio_memcpy_fromio); | |
464 | ||
465 | /** | |
466 | * sdio_memcpy_toio - write a chunk of memory to a SDIO function | |
467 | * @func: SDIO function to access | |
468 | * @addr: address to start writing to | |
469 | * @src: buffer that contains the data to write | |
470 | * @count: number of bytes to write | |
471 | * | |
eb659468 DV |
472 | * Writes to the address space of a given SDIO function. Return |
473 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
474 | */ |
475 | int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, | |
476 | void *src, int count) | |
477 | { | |
eb659468 | 478 | return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count); |
112c9db9 PO |
479 | } |
480 | EXPORT_SYMBOL_GPL(sdio_memcpy_toio); | |
481 | ||
482 | /** | |
483 | * sdio_readsb - read from a FIFO on a SDIO function | |
484 | * @func: SDIO function to access | |
485 | * @dst: buffer to store the data | |
486 | * @addr: address of (single byte) FIFO | |
487 | * @count: number of bytes to read | |
488 | * | |
eb659468 DV |
489 | * Reads from the specified FIFO of a given SDIO function. Return |
490 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
491 | */ |
492 | int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr, | |
493 | int count) | |
494 | { | |
eb659468 | 495 | return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count); |
112c9db9 | 496 | } |
112c9db9 PO |
497 | EXPORT_SYMBOL_GPL(sdio_readsb); |
498 | ||
499 | /** | |
500 | * sdio_writesb - write to a FIFO of a SDIO function | |
501 | * @func: SDIO function to access | |
502 | * @addr: address of (single byte) FIFO | |
503 | * @src: buffer that contains the data to write | |
504 | * @count: number of bytes to write | |
505 | * | |
eb659468 DV |
506 | * Writes to the specified FIFO of a given SDIO function. Return |
507 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
508 | */ |
509 | int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src, | |
510 | int count) | |
511 | { | |
eb659468 | 512 | return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count); |
112c9db9 PO |
513 | } |
514 | EXPORT_SYMBOL_GPL(sdio_writesb); | |
515 | ||
516 | /** | |
517 | * sdio_readw - read a 16 bit integer from a SDIO function | |
518 | * @func: SDIO function to access | |
519 | * @addr: address to read | |
520 | * @err_ret: optional status value from transfer | |
521 | * | |
522 | * Reads a 16 bit integer from the address space of a given SDIO | |
523 | * function. If there is a problem reading the address, 0xffff | |
524 | * is returned and @err_ret will contain the error code. | |
525 | */ | |
6d373331 | 526 | u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
527 | { |
528 | int ret; | |
529 | ||
530 | if (err_ret) | |
531 | *err_ret = 0; | |
532 | ||
533 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); | |
534 | if (ret) { | |
535 | if (err_ret) | |
536 | *err_ret = ret; | |
537 | return 0xFFFF; | |
538 | } | |
539 | ||
6d373331 | 540 | return le16_to_cpup((__le16 *)func->tmpbuf); |
112c9db9 PO |
541 | } |
542 | EXPORT_SYMBOL_GPL(sdio_readw); | |
543 | ||
544 | /** | |
545 | * sdio_writew - write a 16 bit integer to a SDIO function | |
546 | * @func: SDIO function to access | |
547 | * @b: integer to write | |
548 | * @addr: address to write to | |
549 | * @err_ret: optional status value from transfer | |
550 | * | |
551 | * Writes a 16 bit integer to the address space of a given SDIO | |
552 | * function. @err_ret will contain the status of the actual | |
553 | * transfer. | |
554 | */ | |
6d373331 | 555 | void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
556 | { |
557 | int ret; | |
558 | ||
6d373331 | 559 | *(__le16 *)func->tmpbuf = cpu_to_le16(b); |
112c9db9 PO |
560 | |
561 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2); | |
562 | if (err_ret) | |
563 | *err_ret = ret; | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(sdio_writew); | |
566 | ||
567 | /** | |
568 | * sdio_readl - read a 32 bit integer from a SDIO function | |
569 | * @func: SDIO function to access | |
570 | * @addr: address to read | |
571 | * @err_ret: optional status value from transfer | |
572 | * | |
573 | * Reads a 32 bit integer from the address space of a given SDIO | |
574 | * function. If there is a problem reading the address, | |
575 | * 0xffffffff is returned and @err_ret will contain the error | |
576 | * code. | |
577 | */ | |
6d373331 | 578 | u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
579 | { |
580 | int ret; | |
581 | ||
582 | if (err_ret) | |
583 | *err_ret = 0; | |
584 | ||
585 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); | |
586 | if (ret) { | |
587 | if (err_ret) | |
588 | *err_ret = ret; | |
589 | return 0xFFFFFFFF; | |
590 | } | |
591 | ||
6d373331 | 592 | return le32_to_cpup((__le32 *)func->tmpbuf); |
112c9db9 PO |
593 | } |
594 | EXPORT_SYMBOL_GPL(sdio_readl); | |
595 | ||
596 | /** | |
597 | * sdio_writel - write a 32 bit integer to a SDIO function | |
598 | * @func: SDIO function to access | |
599 | * @b: integer to write | |
600 | * @addr: address to write to | |
601 | * @err_ret: optional status value from transfer | |
602 | * | |
603 | * Writes a 32 bit integer to the address space of a given SDIO | |
604 | * function. @err_ret will contain the status of the actual | |
605 | * transfer. | |
606 | */ | |
6d373331 | 607 | void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
608 | { |
609 | int ret; | |
610 | ||
6d373331 | 611 | *(__le32 *)func->tmpbuf = cpu_to_le32(b); |
112c9db9 PO |
612 | |
613 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4); | |
614 | if (err_ret) | |
615 | *err_ret = ret; | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(sdio_writel); | |
618 | ||
7806cdb4 DV |
619 | /** |
620 | * sdio_f0_readb - read a single byte from SDIO function 0 | |
621 | * @func: an SDIO function of the card | |
622 | * @addr: address to read | |
623 | * @err_ret: optional status value from transfer | |
624 | * | |
625 | * Reads a single byte from the address space of SDIO function 0. | |
626 | * If there is a problem reading the address, 0xff is returned | |
627 | * and @err_ret will contain the error code. | |
628 | */ | |
629 | unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, | |
630 | int *err_ret) | |
631 | { | |
632 | int ret; | |
633 | unsigned char val; | |
634 | ||
be1f970b SL |
635 | if (!func) { |
636 | *err_ret = -EINVAL; | |
637 | return 0xFF; | |
638 | } | |
7806cdb4 DV |
639 | |
640 | if (err_ret) | |
641 | *err_ret = 0; | |
642 | ||
643 | ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); | |
644 | if (ret) { | |
645 | if (err_ret) | |
646 | *err_ret = ret; | |
647 | return 0xFF; | |
648 | } | |
649 | ||
650 | return val; | |
651 | } | |
652 | EXPORT_SYMBOL_GPL(sdio_f0_readb); | |
653 | ||
654 | /** | |
655 | * sdio_f0_writeb - write a single byte to SDIO function 0 | |
656 | * @func: an SDIO function of the card | |
657 | * @b: byte to write | |
658 | * @addr: address to write to | |
659 | * @err_ret: optional status value from transfer | |
660 | * | |
661 | * Writes a single byte to the address space of SDIO function 0. | |
662 | * @err_ret will contain the status of the actual transfer. | |
663 | * | |
664 | * Only writes to the vendor specific CCCR registers (0xF0 - | |
665 | * 0xFF) are permiited; @err_ret will be set to -EINVAL for * | |
666 | * writes outside this range. | |
667 | */ | |
668 | void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, | |
669 | int *err_ret) | |
670 | { | |
671 | int ret; | |
672 | ||
be1f970b SL |
673 | if (!func) { |
674 | *err_ret = -EINVAL; | |
675 | return; | |
676 | } | |
7806cdb4 | 677 | |
7c979ec7 | 678 | if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
7806cdb4 DV |
679 | if (err_ret) |
680 | *err_ret = -EINVAL; | |
681 | return; | |
682 | } | |
683 | ||
684 | ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL); | |
685 | if (err_ret) | |
686 | *err_ret = ret; | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(sdio_f0_writeb); | |
da68c4eb NP |
689 | |
690 | /** | |
691 | * sdio_get_host_pm_caps - get host power management capabilities | |
692 | * @func: SDIO function attached to host | |
693 | * | |
694 | * Returns a capability bitmask corresponding to power management | |
695 | * features supported by the host controller that the card function | |
696 | * might rely upon during a system suspend. The host doesn't need | |
697 | * to be claimed, nor the function active, for this information to be | |
698 | * obtained. | |
699 | */ | |
700 | mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) | |
701 | { | |
be1f970b SL |
702 | if (!func) |
703 | return 0; | |
da68c4eb NP |
704 | |
705 | return func->card->host->pm_caps; | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); | |
708 | ||
709 | /** | |
710 | * sdio_set_host_pm_flags - set wanted host power management capabilities | |
711 | * @func: SDIO function attached to host | |
712 | * | |
713 | * Set a capability bitmask corresponding to wanted host controller | |
714 | * power management features for the upcoming suspend state. | |
715 | * This must be called, if needed, each time the suspend method of | |
716 | * the function driver is called, and must contain only bits that | |
717 | * were returned by sdio_get_host_pm_caps(). | |
718 | * The host doesn't need to be claimed, nor the function active, | |
719 | * for this information to be set. | |
720 | */ | |
721 | int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) | |
722 | { | |
723 | struct mmc_host *host; | |
724 | ||
be1f970b SL |
725 | if (!func) |
726 | return -EINVAL; | |
da68c4eb NP |
727 | |
728 | host = func->card->host; | |
729 | ||
730 | if (flags & ~host->pm_caps) | |
731 | return -EINVAL; | |
732 | ||
733 | /* function suspend methods are serialized, hence no lock needed */ | |
734 | host->pm_flags |= flags; | |
735 | return 0; | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); |