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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
46f555f2 PO |
2 | /* |
3 | * linux/drivers/mmc/core/sdio_io.c | |
4 | * | |
ad3868b2 | 5 | * Copyright 2007-2008 Pierre Ossman |
46f555f2 PO |
6 | */ |
7 | ||
3ef77af1 | 8 | #include <linux/export.h> |
eae343c2 | 9 | #include <linux/kernel.h> |
46f555f2 PO |
10 | #include <linux/mmc/host.h> |
11 | #include <linux/mmc/card.h> | |
fa64efa1 | 12 | #include <linux/mmc/sdio.h> |
46f555f2 PO |
13 | #include <linux/mmc/sdio_func.h> |
14 | ||
15 | #include "sdio_ops.h" | |
55244c56 | 16 | #include "core.h" |
4facdde1 | 17 | #include "card.h" |
46f555f2 PO |
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 | { | |
923dff87 SL |
28 | if (WARN_ON(!func)) |
29 | return; | |
46f555f2 PO |
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 | { | |
923dff87 SL |
44 | if (WARN_ON(!func)) |
45 | return; | |
46f555f2 PO |
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 | ||
923dff87 SL |
64 | if (!func) |
65 | return -EINVAL; | |
fa64efa1 PO |
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 | ||
923dff87 SL |
114 | if (!func) |
115 | return -EINVAL; | |
fa64efa1 PO |
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 | { | |
968a64ea | 190 | unsigned mval = func->card->host->max_blk_size; |
3fb7fb4a BZ |
191 | |
192 | if (mmc_blksz_for_byte_mode(func->card)) | |
193 | mval = min(mval, func->cur_blksize); | |
194 | else | |
195 | mval = min(mval, func->max_blksize); | |
196 | ||
052d81da SNX |
197 | if (mmc_card_broken_byte_mode_512(func->card)) |
198 | return min(mval, 511u); | |
199 | ||
ea901300 | 200 | return min(mval, 512u); /* maximum size for byte mode */ |
eea0f581 PO |
201 | } |
202 | ||
eae343c2 UH |
203 | /* |
204 | * This is legacy code, which needs to be re-worked some day. Basically we need | |
205 | * to take into account the properties of the host, as to enable the SDIO func | |
206 | * driver layer to allocate optimal buffers. | |
207 | */ | |
208 | static inline unsigned int _sdio_align_size(unsigned int sz) | |
209 | { | |
210 | /* | |
211 | * FIXME: We don't have a system for the controller to tell | |
212 | * the core about its problems yet, so for now we just 32-bit | |
213 | * align the size. | |
214 | */ | |
215 | return ALIGN(sz, 4); | |
216 | } | |
217 | ||
ad3868b2 PO |
218 | /** |
219 | * sdio_align_size - pads a transfer size to a more optimal value | |
220 | * @func: SDIO function | |
221 | * @sz: original transfer size | |
222 | * | |
223 | * Pads the original data size with a number of extra bytes in | |
224 | * order to avoid controller bugs and/or performance hits | |
225 | * (e.g. some controllers revert to PIO for certain sizes). | |
226 | * | |
227 | * If possible, it will also adjust the size so that it can be | |
228 | * handled in just a single request. | |
229 | * | |
230 | * Returns the improved size, which might be unmodified. | |
231 | */ | |
232 | unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) | |
233 | { | |
234 | unsigned int orig_sz; | |
235 | unsigned int blk_sz, byte_sz; | |
236 | unsigned chunk_sz; | |
237 | ||
238 | orig_sz = sz; | |
239 | ||
240 | /* | |
241 | * Do a first check with the controller, in case it | |
242 | * wants to increase the size up to a point where it | |
243 | * might need more than one block. | |
244 | */ | |
eae343c2 | 245 | sz = _sdio_align_size(sz); |
ad3868b2 PO |
246 | |
247 | /* | |
248 | * If we can still do this with just a byte transfer, then | |
249 | * we're done. | |
250 | */ | |
eea0f581 | 251 | if (sz <= sdio_max_byte_size(func)) |
ad3868b2 PO |
252 | return sz; |
253 | ||
254 | if (func->card->cccr.multi_block) { | |
255 | /* | |
256 | * Check if the transfer is already block aligned | |
257 | */ | |
258 | if ((sz % func->cur_blksize) == 0) | |
259 | return sz; | |
260 | ||
261 | /* | |
262 | * Realign it so that it can be done with one request, | |
263 | * and recheck if the controller still likes it. | |
264 | */ | |
265 | blk_sz = ((sz + func->cur_blksize - 1) / | |
266 | func->cur_blksize) * func->cur_blksize; | |
eae343c2 | 267 | blk_sz = _sdio_align_size(blk_sz); |
ad3868b2 PO |
268 | |
269 | /* | |
270 | * This value is only good if it is still just | |
271 | * one request. | |
272 | */ | |
273 | if ((blk_sz % func->cur_blksize) == 0) | |
274 | return blk_sz; | |
275 | ||
276 | /* | |
277 | * We failed to do one request, but at least try to | |
278 | * pad the remainder properly. | |
279 | */ | |
eae343c2 | 280 | byte_sz = _sdio_align_size(sz % func->cur_blksize); |
eea0f581 | 281 | if (byte_sz <= sdio_max_byte_size(func)) { |
ad3868b2 PO |
282 | blk_sz = sz / func->cur_blksize; |
283 | return blk_sz * func->cur_blksize + byte_sz; | |
284 | } | |
285 | } else { | |
286 | /* | |
287 | * We need multiple requests, so first check that the | |
288 | * controller can handle the chunk size; | |
289 | */ | |
eae343c2 | 290 | chunk_sz = _sdio_align_size(sdio_max_byte_size(func)); |
eea0f581 | 291 | if (chunk_sz == sdio_max_byte_size(func)) { |
ad3868b2 PO |
292 | /* |
293 | * Fix up the size of the remainder (if any) | |
294 | */ | |
295 | byte_sz = orig_sz % chunk_sz; | |
296 | if (byte_sz) { | |
eae343c2 | 297 | byte_sz = _sdio_align_size(byte_sz); |
ad3868b2 PO |
298 | } |
299 | ||
300 | return (orig_sz / chunk_sz) * chunk_sz + byte_sz; | |
301 | } | |
302 | } | |
303 | ||
304 | /* | |
305 | * The controller is simply incapable of transferring the size | |
306 | * we want in decent manner, so just return the original size. | |
307 | */ | |
308 | return orig_sz; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(sdio_align_size); | |
311 | ||
eb659468 DV |
312 | /* Split an arbitrarily sized data transfer into several |
313 | * IO_RW_EXTENDED commands. */ | |
314 | static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, | |
315 | unsigned addr, int incr_addr, u8 *buf, unsigned size) | |
316 | { | |
317 | unsigned remainder = size; | |
318 | unsigned max_blocks; | |
319 | int ret; | |
320 | ||
923dff87 SL |
321 | if (!func || (func->num > 7)) |
322 | return -EINVAL; | |
323 | ||
eb659468 | 324 | /* Do the bulk of the transfer using block mode (if supported). */ |
eea0f581 | 325 | if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) { |
eb659468 | 326 | /* Blocks per command is limited by host count, host transfer |
968a64ea KK |
327 | * size and the maximum for IO_RW_EXTENDED of 511 blocks. */ |
328 | max_blocks = min(func->card->host->max_blk_count, 511u); | |
eb659468 | 329 | |
052d81da | 330 | while (remainder >= func->cur_blksize) { |
eb659468 DV |
331 | unsigned blocks; |
332 | ||
333 | blocks = remainder / func->cur_blksize; | |
334 | if (blocks > max_blocks) | |
335 | blocks = max_blocks; | |
336 | size = blocks * func->cur_blksize; | |
337 | ||
338 | ret = mmc_io_rw_extended(func->card, write, | |
339 | func->num, addr, incr_addr, buf, | |
340 | blocks, func->cur_blksize); | |
341 | if (ret) | |
342 | return ret; | |
343 | ||
344 | remainder -= size; | |
345 | buf += size; | |
346 | if (incr_addr) | |
347 | addr += size; | |
348 | } | |
349 | } | |
350 | ||
351 | /* Write the remainder using byte mode. */ | |
352 | while (remainder > 0) { | |
eea0f581 | 353 | size = min(remainder, sdio_max_byte_size(func)); |
eb659468 | 354 | |
052d81da | 355 | /* Indicate byte mode by setting "blocks" = 0 */ |
eb659468 | 356 | ret = mmc_io_rw_extended(func->card, write, func->num, addr, |
052d81da | 357 | incr_addr, buf, 0, size); |
eb659468 DV |
358 | if (ret) |
359 | return ret; | |
360 | ||
361 | remainder -= size; | |
362 | buf += size; | |
363 | if (incr_addr) | |
364 | addr += size; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
46f555f2 PO |
369 | /** |
370 | * sdio_readb - read a single byte from a SDIO function | |
371 | * @func: SDIO function to access | |
372 | * @addr: address to read | |
373 | * @err_ret: optional status value from transfer | |
374 | * | |
375 | * Reads a single byte from the address space of a given SDIO | |
376 | * function. If there is a problem reading the address, 0xff | |
377 | * is returned and @err_ret will contain the error code. | |
378 | */ | |
6d373331 | 379 | u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
46f555f2 PO |
380 | { |
381 | int ret; | |
6d373331 | 382 | u8 val; |
46f555f2 | 383 | |
923dff87 | 384 | if (!func) { |
9b980d95 | 385 | if (err_ret) |
386 | *err_ret = -EINVAL; | |
923dff87 SL |
387 | return 0xFF; |
388 | } | |
46f555f2 | 389 | |
46f555f2 | 390 | ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); |
8e11b284 | 391 | if (err_ret) |
392 | *err_ret = ret; | |
393 | if (ret) | |
46f555f2 | 394 | return 0xFF; |
46f555f2 PO |
395 | |
396 | return val; | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(sdio_readb); | |
399 | ||
400 | /** | |
401 | * sdio_writeb - write a single byte to a SDIO function | |
402 | * @func: SDIO function to access | |
403 | * @b: byte to write | |
404 | * @addr: address to write to | |
405 | * @err_ret: optional status value from transfer | |
406 | * | |
407 | * Writes a single byte to the address space of a given SDIO | |
408 | * function. @err_ret will contain the status of the actual | |
409 | * transfer. | |
410 | */ | |
6d373331 | 411 | void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret) |
46f555f2 PO |
412 | { |
413 | int ret; | |
414 | ||
923dff87 | 415 | if (!func) { |
9b980d95 | 416 | if (err_ret) |
417 | *err_ret = -EINVAL; | |
923dff87 SL |
418 | return; |
419 | } | |
46f555f2 PO |
420 | |
421 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL); | |
422 | if (err_ret) | |
423 | *err_ret = ret; | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(sdio_writeb); | |
426 | ||
6c1f716e GI |
427 | /** |
428 | * sdio_writeb_readb - write and read a byte from SDIO function | |
429 | * @func: SDIO function to access | |
430 | * @write_byte: byte to write | |
431 | * @addr: address to write to | |
432 | * @err_ret: optional status value from transfer | |
433 | * | |
434 | * Performs a RAW (Read after Write) operation as defined by SDIO spec - | |
435 | * single byte is written to address space of a given SDIO function and | |
436 | * response is read back from the same address, both using single request. | |
437 | * If there is a problem with the operation, 0xff is returned and | |
438 | * @err_ret will contain the error code. | |
439 | */ | |
440 | u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, | |
441 | unsigned int addr, int *err_ret) | |
442 | { | |
443 | int ret; | |
444 | u8 val; | |
445 | ||
446 | ret = mmc_io_rw_direct(func->card, 1, func->num, addr, | |
447 | write_byte, &val); | |
448 | if (err_ret) | |
449 | *err_ret = ret; | |
450 | if (ret) | |
8e11b284 | 451 | return 0xff; |
6c1f716e GI |
452 | |
453 | return val; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(sdio_writeb_readb); | |
456 | ||
112c9db9 PO |
457 | /** |
458 | * sdio_memcpy_fromio - read a chunk of memory from a SDIO function | |
459 | * @func: SDIO function to access | |
460 | * @dst: buffer to store the data | |
461 | * @addr: address to begin reading from | |
462 | * @count: number of bytes to read | |
463 | * | |
eb659468 DV |
464 | * Reads from the address space of a given SDIO function. Return |
465 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
466 | */ |
467 | int sdio_memcpy_fromio(struct sdio_func *func, void *dst, | |
468 | unsigned int addr, int count) | |
469 | { | |
eb659468 | 470 | return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count); |
112c9db9 PO |
471 | } |
472 | EXPORT_SYMBOL_GPL(sdio_memcpy_fromio); | |
473 | ||
474 | /** | |
475 | * sdio_memcpy_toio - write a chunk of memory to a SDIO function | |
476 | * @func: SDIO function to access | |
477 | * @addr: address to start writing to | |
478 | * @src: buffer that contains the data to write | |
479 | * @count: number of bytes to write | |
480 | * | |
eb659468 DV |
481 | * Writes to the address space of a given SDIO function. Return |
482 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
483 | */ |
484 | int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr, | |
485 | void *src, int count) | |
486 | { | |
eb659468 | 487 | return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count); |
112c9db9 PO |
488 | } |
489 | EXPORT_SYMBOL_GPL(sdio_memcpy_toio); | |
490 | ||
491 | /** | |
492 | * sdio_readsb - read from a FIFO on a SDIO function | |
493 | * @func: SDIO function to access | |
494 | * @dst: buffer to store the data | |
495 | * @addr: address of (single byte) FIFO | |
496 | * @count: number of bytes to read | |
497 | * | |
eb659468 DV |
498 | * Reads from the specified FIFO of a given SDIO function. Return |
499 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
500 | */ |
501 | int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr, | |
502 | int count) | |
503 | { | |
eb659468 | 504 | return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count); |
112c9db9 | 505 | } |
112c9db9 PO |
506 | EXPORT_SYMBOL_GPL(sdio_readsb); |
507 | ||
508 | /** | |
509 | * sdio_writesb - write to a FIFO of a SDIO function | |
510 | * @func: SDIO function to access | |
511 | * @addr: address of (single byte) FIFO | |
512 | * @src: buffer that contains the data to write | |
513 | * @count: number of bytes to write | |
514 | * | |
eb659468 DV |
515 | * Writes to the specified FIFO of a given SDIO function. Return |
516 | * value indicates if the transfer succeeded or not. | |
112c9db9 PO |
517 | */ |
518 | int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src, | |
519 | int count) | |
520 | { | |
eb659468 | 521 | return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count); |
112c9db9 PO |
522 | } |
523 | EXPORT_SYMBOL_GPL(sdio_writesb); | |
524 | ||
525 | /** | |
526 | * sdio_readw - read a 16 bit integer from a SDIO function | |
527 | * @func: SDIO function to access | |
528 | * @addr: address to read | |
529 | * @err_ret: optional status value from transfer | |
530 | * | |
531 | * Reads a 16 bit integer from the address space of a given SDIO | |
532 | * function. If there is a problem reading the address, 0xffff | |
533 | * is returned and @err_ret will contain the error code. | |
534 | */ | |
6d373331 | 535 | u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
536 | { |
537 | int ret; | |
538 | ||
112c9db9 | 539 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); |
8e11b284 | 540 | if (err_ret) |
541 | *err_ret = ret; | |
542 | if (ret) | |
112c9db9 | 543 | return 0xFFFF; |
112c9db9 | 544 | |
6d373331 | 545 | return le16_to_cpup((__le16 *)func->tmpbuf); |
112c9db9 PO |
546 | } |
547 | EXPORT_SYMBOL_GPL(sdio_readw); | |
548 | ||
549 | /** | |
550 | * sdio_writew - write a 16 bit integer to a SDIO function | |
551 | * @func: SDIO function to access | |
552 | * @b: integer to write | |
553 | * @addr: address to write to | |
554 | * @err_ret: optional status value from transfer | |
555 | * | |
556 | * Writes a 16 bit integer to the address space of a given SDIO | |
557 | * function. @err_ret will contain the status of the actual | |
558 | * transfer. | |
559 | */ | |
6d373331 | 560 | void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
561 | { |
562 | int ret; | |
563 | ||
6d373331 | 564 | *(__le16 *)func->tmpbuf = cpu_to_le16(b); |
112c9db9 PO |
565 | |
566 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2); | |
567 | if (err_ret) | |
568 | *err_ret = ret; | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(sdio_writew); | |
571 | ||
572 | /** | |
573 | * sdio_readl - read a 32 bit integer from a SDIO function | |
574 | * @func: SDIO function to access | |
575 | * @addr: address to read | |
576 | * @err_ret: optional status value from transfer | |
577 | * | |
578 | * Reads a 32 bit integer from the address space of a given SDIO | |
579 | * function. If there is a problem reading the address, | |
580 | * 0xffffffff is returned and @err_ret will contain the error | |
581 | * code. | |
582 | */ | |
6d373331 | 583 | u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
112c9db9 PO |
584 | { |
585 | int ret; | |
586 | ||
112c9db9 | 587 | ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); |
8e11b284 | 588 | if (err_ret) |
589 | *err_ret = ret; | |
590 | if (ret) | |
112c9db9 | 591 | return 0xFFFFFFFF; |
112c9db9 | 592 | |
6d373331 | 593 | return le32_to_cpup((__le32 *)func->tmpbuf); |
112c9db9 PO |
594 | } |
595 | EXPORT_SYMBOL_GPL(sdio_readl); | |
596 | ||
597 | /** | |
598 | * sdio_writel - write a 32 bit integer to a SDIO function | |
599 | * @func: SDIO function to access | |
600 | * @b: integer to write | |
601 | * @addr: address to write to | |
602 | * @err_ret: optional status value from transfer | |
603 | * | |
604 | * Writes a 32 bit integer to the address space of a given SDIO | |
605 | * function. @err_ret will contain the status of the actual | |
606 | * transfer. | |
607 | */ | |
6d373331 | 608 | void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret) |
112c9db9 PO |
609 | { |
610 | int ret; | |
611 | ||
6d373331 | 612 | *(__le32 *)func->tmpbuf = cpu_to_le32(b); |
112c9db9 PO |
613 | |
614 | ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4); | |
615 | if (err_ret) | |
616 | *err_ret = ret; | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(sdio_writel); | |
619 | ||
7806cdb4 DV |
620 | /** |
621 | * sdio_f0_readb - read a single byte from SDIO function 0 | |
622 | * @func: an SDIO function of the card | |
623 | * @addr: address to read | |
624 | * @err_ret: optional status value from transfer | |
625 | * | |
626 | * Reads a single byte from the address space of SDIO function 0. | |
627 | * If there is a problem reading the address, 0xff is returned | |
628 | * and @err_ret will contain the error code. | |
629 | */ | |
630 | unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, | |
631 | int *err_ret) | |
632 | { | |
633 | int ret; | |
634 | unsigned char val; | |
635 | ||
923dff87 | 636 | if (!func) { |
9b980d95 | 637 | if (err_ret) |
638 | *err_ret = -EINVAL; | |
923dff87 SL |
639 | return 0xFF; |
640 | } | |
7806cdb4 | 641 | |
7806cdb4 | 642 | ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); |
8e11b284 | 643 | if (err_ret) |
644 | *err_ret = ret; | |
645 | if (ret) | |
7806cdb4 | 646 | return 0xFF; |
7806cdb4 DV |
647 | |
648 | return val; | |
649 | } | |
650 | EXPORT_SYMBOL_GPL(sdio_f0_readb); | |
651 | ||
652 | /** | |
653 | * sdio_f0_writeb - write a single byte to SDIO function 0 | |
654 | * @func: an SDIO function of the card | |
655 | * @b: byte to write | |
656 | * @addr: address to write to | |
657 | * @err_ret: optional status value from transfer | |
658 | * | |
659 | * Writes a single byte to the address space of SDIO function 0. | |
660 | * @err_ret will contain the status of the actual transfer. | |
661 | * | |
662 | * Only writes to the vendor specific CCCR registers (0xF0 - | |
663 | * 0xFF) are permiited; @err_ret will be set to -EINVAL for * | |
664 | * writes outside this range. | |
665 | */ | |
666 | void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr, | |
667 | int *err_ret) | |
668 | { | |
669 | int ret; | |
670 | ||
923dff87 | 671 | if (!func) { |
9b980d95 | 672 | if (err_ret) |
673 | *err_ret = -EINVAL; | |
923dff87 SL |
674 | return; |
675 | } | |
7806cdb4 | 676 | |
7c979ec7 | 677 | if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
7806cdb4 DV |
678 | if (err_ret) |
679 | *err_ret = -EINVAL; | |
680 | return; | |
681 | } | |
682 | ||
683 | ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL); | |
684 | if (err_ret) | |
685 | *err_ret = ret; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(sdio_f0_writeb); | |
da68c4eb NP |
688 | |
689 | /** | |
690 | * sdio_get_host_pm_caps - get host power management capabilities | |
691 | * @func: SDIO function attached to host | |
692 | * | |
693 | * Returns a capability bitmask corresponding to power management | |
694 | * features supported by the host controller that the card function | |
695 | * might rely upon during a system suspend. The host doesn't need | |
696 | * to be claimed, nor the function active, for this information to be | |
697 | * obtained. | |
698 | */ | |
699 | mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) | |
700 | { | |
923dff87 SL |
701 | if (!func) |
702 | return 0; | |
da68c4eb NP |
703 | |
704 | return func->card->host->pm_caps; | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); | |
707 | ||
708 | /** | |
709 | * sdio_set_host_pm_flags - set wanted host power management capabilities | |
710 | * @func: SDIO function attached to host | |
711 | * | |
712 | * Set a capability bitmask corresponding to wanted host controller | |
713 | * power management features for the upcoming suspend state. | |
714 | * This must be called, if needed, each time the suspend method of | |
715 | * the function driver is called, and must contain only bits that | |
716 | * were returned by sdio_get_host_pm_caps(). | |
717 | * The host doesn't need to be claimed, nor the function active, | |
718 | * for this information to be set. | |
719 | */ | |
720 | int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) | |
721 | { | |
722 | struct mmc_host *host; | |
723 | ||
923dff87 SL |
724 | if (!func) |
725 | return -EINVAL; | |
da68c4eb NP |
726 | |
727 | host = func->card->host; | |
728 | ||
729 | if (flags & ~host->pm_caps) | |
730 | return -EINVAL; | |
731 | ||
732 | /* function suspend methods are serialized, hence no lock needed */ | |
733 | host->pm_flags |= flags; | |
734 | return 0; | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); | |
0a55f4ab DA |
737 | |
738 | /** | |
739 | * sdio_retune_crc_disable - temporarily disable retuning on CRC errors | |
740 | * @func: SDIO function attached to host | |
741 | * | |
742 | * If the SDIO card is known to be in a state where it might produce | |
743 | * CRC errors on the bus in response to commands (like if we know it is | |
744 | * transitioning between power states), an SDIO function driver can | |
745 | * call this function to temporarily disable the SD/MMC core behavior of | |
746 | * triggering an automatic retuning. | |
747 | * | |
748 | * This function should be called while the host is claimed and the host | |
749 | * should remain claimed until sdio_retune_crc_enable() is called. | |
750 | * Specifically, the expected sequence of calls is: | |
751 | * - sdio_claim_host() | |
752 | * - sdio_retune_crc_disable() | |
753 | * - some number of calls like sdio_writeb() and sdio_readb() | |
754 | * - sdio_retune_crc_enable() | |
755 | * - sdio_release_host() | |
756 | */ | |
757 | void sdio_retune_crc_disable(struct sdio_func *func) | |
758 | { | |
759 | func->card->host->retune_crc_disable = true; | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(sdio_retune_crc_disable); | |
762 | ||
763 | /** | |
764 | * sdio_retune_crc_enable - re-enable retuning on CRC errors | |
765 | * @func: SDIO function attached to host | |
766 | * | |
767 | * This is the compement to sdio_retune_crc_disable(). | |
768 | */ | |
769 | void sdio_retune_crc_enable(struct sdio_func *func) | |
770 | { | |
771 | func->card->host->retune_crc_disable = false; | |
772 | } | |
773 | EXPORT_SYMBOL_GPL(sdio_retune_crc_enable); |