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1/*
2 * linux/drivers/mmc/core/sdio_io.c
3 *
4 * Copyright 2007-2008 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/mmc/host.h>
13#include <linux/mmc/card.h>
14#include <linux/mmc/sdio.h>
15#include <linux/mmc/sdio_func.h>
16
17#include "sdio_ops.h"
18
19/**
20 * sdio_claim_host - exclusively claim a bus for a certain SDIO function
21 * @func: SDIO function that will be accessed
22 *
23 * Claim a bus for a set of operations. The SDIO function given
24 * is used to figure out which bus is relevant.
25 */
26void sdio_claim_host(struct sdio_func *func)
27{
28 BUG_ON(!func);
29 BUG_ON(!func->card);
30
31 mmc_claim_host(func->card->host);
32}
33EXPORT_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 */
42void sdio_release_host(struct sdio_func *func)
43{
44 BUG_ON(!func);
45 BUG_ON(!func->card);
46
47 mmc_release_host(func->card->host);
48}
49EXPORT_SYMBOL_GPL(sdio_release_host);
50
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 */
58int sdio_enable_func(struct sdio_func *func)
59{
60 int ret;
61 unsigned char reg;
62 unsigned long timeout;
63
64 BUG_ON(!func);
65 BUG_ON(!func->card);
66
67 pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
68
69 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
70 if (ret)
71 goto err;
72
73 reg |= 1 << func->num;
74
75 ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
76 if (ret)
77 goto err;
78
79 timeout = jiffies + msecs_to_jiffies(func->enable_timeout);
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
96err:
97 pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
98 return ret;
99}
100EXPORT_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 */
109int sdio_disable_func(struct sdio_func *func)
110{
111 int ret;
112 unsigned char reg;
113
114 BUG_ON(!func);
115 BUG_ON(!func->card);
116
117 pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
118
119 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
120 if (ret)
121 goto err;
122
123 reg &= ~(1 << func->num);
124
125 ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
126 if (ret)
127 goto err;
128
129 pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
130
131 return 0;
132
133err:
134 pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
135 return -EIO;
136}
137EXPORT_SYMBOL_GPL(sdio_disable_func);
138
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 */
158int 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) {
166 blksz = min(func->max_blksize, func->card->host->max_blk_size);
167 blksz = min(blksz, 512u);
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}
183EXPORT_SYMBOL_GPL(sdio_set_block_size);
184
185/*
186 * Calculate the maximum byte mode transfer size
187 */
188static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
189{
190 unsigned mval = min(func->card->host->max_seg_size,
191 func->card->host->max_blk_size);
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
198 return min(mval, 512u); /* maximum size for byte mode */
199}
200
201/**
202 * sdio_align_size - pads a transfer size to a more optimal value
203 * @func: SDIO function
204 * @sz: original transfer size
205 *
206 * Pads the original data size with a number of extra bytes in
207 * order to avoid controller bugs and/or performance hits
208 * (e.g. some controllers revert to PIO for certain sizes).
209 *
210 * If possible, it will also adjust the size so that it can be
211 * handled in just a single request.
212 *
213 * Returns the improved size, which might be unmodified.
214 */
215unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
216{
217 unsigned int orig_sz;
218 unsigned int blk_sz, byte_sz;
219 unsigned chunk_sz;
220
221 orig_sz = sz;
222
223 /*
224 * Do a first check with the controller, in case it
225 * wants to increase the size up to a point where it
226 * might need more than one block.
227 */
228 sz = mmc_align_data_size(func->card, sz);
229
230 /*
231 * If we can still do this with just a byte transfer, then
232 * we're done.
233 */
234 if (sz <= sdio_max_byte_size(func))
235 return sz;
236
237 if (func->card->cccr.multi_block) {
238 /*
239 * Check if the transfer is already block aligned
240 */
241 if ((sz % func->cur_blksize) == 0)
242 return sz;
243
244 /*
245 * Realign it so that it can be done with one request,
246 * and recheck if the controller still likes it.
247 */
248 blk_sz = ((sz + func->cur_blksize - 1) /
249 func->cur_blksize) * func->cur_blksize;
250 blk_sz = mmc_align_data_size(func->card, blk_sz);
251
252 /*
253 * This value is only good if it is still just
254 * one request.
255 */
256 if ((blk_sz % func->cur_blksize) == 0)
257 return blk_sz;
258
259 /*
260 * We failed to do one request, but at least try to
261 * pad the remainder properly.
262 */
263 byte_sz = mmc_align_data_size(func->card,
264 sz % func->cur_blksize);
265 if (byte_sz <= sdio_max_byte_size(func)) {
266 blk_sz = sz / func->cur_blksize;
267 return blk_sz * func->cur_blksize + byte_sz;
268 }
269 } else {
270 /*
271 * We need multiple requests, so first check that the
272 * controller can handle the chunk size;
273 */
274 chunk_sz = mmc_align_data_size(func->card,
275 sdio_max_byte_size(func));
276 if (chunk_sz == sdio_max_byte_size(func)) {
277 /*
278 * Fix up the size of the remainder (if any)
279 */
280 byte_sz = orig_sz % chunk_sz;
281 if (byte_sz) {
282 byte_sz = mmc_align_data_size(func->card,
283 byte_sz);
284 }
285
286 return (orig_sz / chunk_sz) * chunk_sz + byte_sz;
287 }
288 }
289
290 /*
291 * The controller is simply incapable of transferring the size
292 * we want in decent manner, so just return the original size.
293 */
294 return orig_sz;
295}
296EXPORT_SYMBOL_GPL(sdio_align_size);
297
298/* Split an arbitrarily sized data transfer into several
299 * IO_RW_EXTENDED commands. */
300static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
301 unsigned addr, int incr_addr, u8 *buf, unsigned size)
302{
303 unsigned remainder = size;
304 unsigned max_blocks;
305 int ret;
306
307 /* Do the bulk of the transfer using block mode (if supported). */
308 if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) {
309 /* Blocks per command is limited by host count, host transfer
310 * size (we only use a single sg entry) and the maximum for
311 * IO_RW_EXTENDED of 511 blocks. */
312 max_blocks = min(func->card->host->max_blk_count,
313 func->card->host->max_seg_size / func->cur_blksize);
314 max_blocks = min(max_blocks, 511u);
315
316 while (remainder > func->cur_blksize) {
317 unsigned blocks;
318
319 blocks = remainder / func->cur_blksize;
320 if (blocks > max_blocks)
321 blocks = max_blocks;
322 size = blocks * func->cur_blksize;
323
324 ret = mmc_io_rw_extended(func->card, write,
325 func->num, addr, incr_addr, buf,
326 blocks, func->cur_blksize);
327 if (ret)
328 return ret;
329
330 remainder -= size;
331 buf += size;
332 if (incr_addr)
333 addr += size;
334 }
335 }
336
337 /* Write the remainder using byte mode. */
338 while (remainder > 0) {
339 size = min(remainder, sdio_max_byte_size(func));
340
341 ret = mmc_io_rw_extended(func->card, write, func->num, addr,
342 incr_addr, buf, 1, size);
343 if (ret)
344 return ret;
345
346 remainder -= size;
347 buf += size;
348 if (incr_addr)
349 addr += size;
350 }
351 return 0;
352}
353
354/**
355 * sdio_readb - read a single byte from a SDIO function
356 * @func: SDIO function to access
357 * @addr: address to read
358 * @err_ret: optional status value from transfer
359 *
360 * Reads a single byte from the address space of a given SDIO
361 * function. If there is a problem reading the address, 0xff
362 * is returned and @err_ret will contain the error code.
363 */
364u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret)
365{
366 int ret;
367 u8 val;
368
369 BUG_ON(!func);
370
371 if (err_ret)
372 *err_ret = 0;
373
374 ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
375 if (ret) {
376 if (err_ret)
377 *err_ret = ret;
378 return 0xFF;
379 }
380
381 return val;
382}
383EXPORT_SYMBOL_GPL(sdio_readb);
384
385/**
386 * sdio_writeb - write a single byte to a SDIO function
387 * @func: SDIO function to access
388 * @b: byte to write
389 * @addr: address to write to
390 * @err_ret: optional status value from transfer
391 *
392 * Writes a single byte to the address space of a given SDIO
393 * function. @err_ret will contain the status of the actual
394 * transfer.
395 */
396void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret)
397{
398 int ret;
399
400 BUG_ON(!func);
401
402 ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
403 if (err_ret)
404 *err_ret = ret;
405}
406EXPORT_SYMBOL_GPL(sdio_writeb);
407
408/**
409 * sdio_writeb_readb - write and read a byte from SDIO function
410 * @func: SDIO function to access
411 * @write_byte: byte to write
412 * @addr: address to write to
413 * @err_ret: optional status value from transfer
414 *
415 * Performs a RAW (Read after Write) operation as defined by SDIO spec -
416 * single byte is written to address space of a given SDIO function and
417 * response is read back from the same address, both using single request.
418 * If there is a problem with the operation, 0xff is returned and
419 * @err_ret will contain the error code.
420 */
421u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte,
422 unsigned int addr, int *err_ret)
423{
424 int ret;
425 u8 val;
426
427 ret = mmc_io_rw_direct(func->card, 1, func->num, addr,
428 write_byte, &val);
429 if (err_ret)
430 *err_ret = ret;
431 if (ret)
432 val = 0xff;
433
434 return val;
435}
436EXPORT_SYMBOL_GPL(sdio_writeb_readb);
437
438/**
439 * sdio_memcpy_fromio - read a chunk of memory from a SDIO function
440 * @func: SDIO function to access
441 * @dst: buffer to store the data
442 * @addr: address to begin reading from
443 * @count: number of bytes to read
444 *
445 * Reads from the address space of a given SDIO function. Return
446 * value indicates if the transfer succeeded or not.
447 */
448int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
449 unsigned int addr, int count)
450{
451 return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
452}
453EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
454
455/**
456 * sdio_memcpy_toio - write a chunk of memory to a SDIO function
457 * @func: SDIO function to access
458 * @addr: address to start writing to
459 * @src: buffer that contains the data to write
460 * @count: number of bytes to write
461 *
462 * Writes to the address space of a given SDIO function. Return
463 * value indicates if the transfer succeeded or not.
464 */
465int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
466 void *src, int count)
467{
468 return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
469}
470EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
471
472/**
473 * sdio_readsb - read from a FIFO on a SDIO function
474 * @func: SDIO function to access
475 * @dst: buffer to store the data
476 * @addr: address of (single byte) FIFO
477 * @count: number of bytes to read
478 *
479 * Reads from the specified FIFO of a given SDIO function. Return
480 * value indicates if the transfer succeeded or not.
481 */
482int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
483 int count)
484{
485 return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
486}
487EXPORT_SYMBOL_GPL(sdio_readsb);
488
489/**
490 * sdio_writesb - write to a FIFO of a SDIO function
491 * @func: SDIO function to access
492 * @addr: address of (single byte) FIFO
493 * @src: buffer that contains the data to write
494 * @count: number of bytes to write
495 *
496 * Writes to the specified FIFO of a given SDIO function. Return
497 * value indicates if the transfer succeeded or not.
498 */
499int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
500 int count)
501{
502 return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
503}
504EXPORT_SYMBOL_GPL(sdio_writesb);
505
506/**
507 * sdio_readw - read a 16 bit integer from a SDIO function
508 * @func: SDIO function to access
509 * @addr: address to read
510 * @err_ret: optional status value from transfer
511 *
512 * Reads a 16 bit integer from the address space of a given SDIO
513 * function. If there is a problem reading the address, 0xffff
514 * is returned and @err_ret will contain the error code.
515 */
516u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret)
517{
518 int ret;
519
520 if (err_ret)
521 *err_ret = 0;
522
523 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
524 if (ret) {
525 if (err_ret)
526 *err_ret = ret;
527 return 0xFFFF;
528 }
529
530 return le16_to_cpup((__le16 *)func->tmpbuf);
531}
532EXPORT_SYMBOL_GPL(sdio_readw);
533
534/**
535 * sdio_writew - write a 16 bit integer to a SDIO function
536 * @func: SDIO function to access
537 * @b: integer to write
538 * @addr: address to write to
539 * @err_ret: optional status value from transfer
540 *
541 * Writes a 16 bit integer to the address space of a given SDIO
542 * function. @err_ret will contain the status of the actual
543 * transfer.
544 */
545void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret)
546{
547 int ret;
548
549 *(__le16 *)func->tmpbuf = cpu_to_le16(b);
550
551 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
552 if (err_ret)
553 *err_ret = ret;
554}
555EXPORT_SYMBOL_GPL(sdio_writew);
556
557/**
558 * sdio_readl - read a 32 bit integer from a SDIO function
559 * @func: SDIO function to access
560 * @addr: address to read
561 * @err_ret: optional status value from transfer
562 *
563 * Reads a 32 bit integer from the address space of a given SDIO
564 * function. If there is a problem reading the address,
565 * 0xffffffff is returned and @err_ret will contain the error
566 * code.
567 */
568u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret)
569{
570 int ret;
571
572 if (err_ret)
573 *err_ret = 0;
574
575 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
576 if (ret) {
577 if (err_ret)
578 *err_ret = ret;
579 return 0xFFFFFFFF;
580 }
581
582 return le32_to_cpup((__le32 *)func->tmpbuf);
583}
584EXPORT_SYMBOL_GPL(sdio_readl);
585
586/**
587 * sdio_writel - write a 32 bit integer to a SDIO function
588 * @func: SDIO function to access
589 * @b: integer to write
590 * @addr: address to write to
591 * @err_ret: optional status value from transfer
592 *
593 * Writes a 32 bit integer to the address space of a given SDIO
594 * function. @err_ret will contain the status of the actual
595 * transfer.
596 */
597void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret)
598{
599 int ret;
600
601 *(__le32 *)func->tmpbuf = cpu_to_le32(b);
602
603 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
604 if (err_ret)
605 *err_ret = ret;
606}
607EXPORT_SYMBOL_GPL(sdio_writel);
608
609/**
610 * sdio_f0_readb - read a single byte from SDIO function 0
611 * @func: an SDIO function of the card
612 * @addr: address to read
613 * @err_ret: optional status value from transfer
614 *
615 * Reads a single byte from the address space of SDIO function 0.
616 * If there is a problem reading the address, 0xff is returned
617 * and @err_ret will contain the error code.
618 */
619unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
620 int *err_ret)
621{
622 int ret;
623 unsigned char val;
624
625 BUG_ON(!func);
626
627 if (err_ret)
628 *err_ret = 0;
629
630 ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
631 if (ret) {
632 if (err_ret)
633 *err_ret = ret;
634 return 0xFF;
635 }
636
637 return val;
638}
639EXPORT_SYMBOL_GPL(sdio_f0_readb);
640
641/**
642 * sdio_f0_writeb - write a single byte to SDIO function 0
643 * @func: an SDIO function of the card
644 * @b: byte to write
645 * @addr: address to write to
646 * @err_ret: optional status value from transfer
647 *
648 * Writes a single byte to the address space of SDIO function 0.
649 * @err_ret will contain the status of the actual transfer.
650 *
651 * Only writes to the vendor specific CCCR registers (0xF0 -
652 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
653 * writes outside this range.
654 */
655void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
656 int *err_ret)
657{
658 int ret;
659
660 BUG_ON(!func);
661
662 if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) {
663 if (err_ret)
664 *err_ret = -EINVAL;
665 return;
666 }
667
668 ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
669 if (err_ret)
670 *err_ret = ret;
671}
672EXPORT_SYMBOL_GPL(sdio_f0_writeb);
673
674/**
675 * sdio_get_host_pm_caps - get host power management capabilities
676 * @func: SDIO function attached to host
677 *
678 * Returns a capability bitmask corresponding to power management
679 * features supported by the host controller that the card function
680 * might rely upon during a system suspend. The host doesn't need
681 * to be claimed, nor the function active, for this information to be
682 * obtained.
683 */
684mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func)
685{
686 BUG_ON(!func);
687 BUG_ON(!func->card);
688
689 return func->card->host->pm_caps;
690}
691EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps);
692
693/**
694 * sdio_set_host_pm_flags - set wanted host power management capabilities
695 * @func: SDIO function attached to host
696 *
697 * Set a capability bitmask corresponding to wanted host controller
698 * power management features for the upcoming suspend state.
699 * This must be called, if needed, each time the suspend method of
700 * the function driver is called, and must contain only bits that
701 * were returned by sdio_get_host_pm_caps().
702 * The host doesn't need to be claimed, nor the function active,
703 * for this information to be set.
704 */
705int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags)
706{
707 struct mmc_host *host;
708
709 BUG_ON(!func);
710 BUG_ON(!func->card);
711
712 host = func->card->host;
713
714 if (flags & ~host->pm_caps)
715 return -EINVAL;
716
717 /* function suspend methods are serialized, hence no lock needed */
718 host->pm_flags |= flags;
719 return 0;
720}
721EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags);
1/*
2 * linux/drivers/mmc/core/sdio_io.c
3 *
4 * Copyright 2007-2008 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/export.h>
13#include <linux/mmc/host.h>
14#include <linux/mmc/card.h>
15#include <linux/mmc/sdio.h>
16#include <linux/mmc/sdio_func.h>
17
18#include "sdio_ops.h"
19#include "core.h"
20#include "card.h"
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 */
29void sdio_claim_host(struct sdio_func *func)
30{
31 if (WARN_ON(!func))
32 return;
33
34 mmc_claim_host(func->card->host);
35}
36EXPORT_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 */
45void sdio_release_host(struct sdio_func *func)
46{
47 if (WARN_ON(!func))
48 return;
49
50 mmc_release_host(func->card->host);
51}
52EXPORT_SYMBOL_GPL(sdio_release_host);
53
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 */
61int sdio_enable_func(struct sdio_func *func)
62{
63 int ret;
64 unsigned char reg;
65 unsigned long timeout;
66
67 if (!func)
68 return -EINVAL;
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
82 timeout = jiffies + msecs_to_jiffies(func->enable_timeout);
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
99err:
100 pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
101 return ret;
102}
103EXPORT_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 */
112int sdio_disable_func(struct sdio_func *func)
113{
114 int ret;
115 unsigned char reg;
116
117 if (!func)
118 return -EINVAL;
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
136err:
137 pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
138 return -EIO;
139}
140EXPORT_SYMBOL_GPL(sdio_disable_func);
141
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 */
161int 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) {
169 blksz = min(func->max_blksize, func->card->host->max_blk_size);
170 blksz = min(blksz, 512u);
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}
186EXPORT_SYMBOL_GPL(sdio_set_block_size);
187
188/*
189 * Calculate the maximum byte mode transfer size
190 */
191static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
192{
193 unsigned mval = func->card->host->max_blk_size;
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
200 if (mmc_card_broken_byte_mode_512(func->card))
201 return min(mval, 511u);
202
203 return min(mval, 512u); /* maximum size for byte mode */
204}
205
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 */
220unsigned 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 */
239 if (sz <= sdio_max_byte_size(func))
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);
270 if (byte_sz <= sdio_max_byte_size(func)) {
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,
280 sdio_max_byte_size(func));
281 if (chunk_sz == sdio_max_byte_size(func)) {
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}
301EXPORT_SYMBOL_GPL(sdio_align_size);
302
303/* Split an arbitrarily sized data transfer into several
304 * IO_RW_EXTENDED commands. */
305static 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
312 if (!func || (func->num > 7))
313 return -EINVAL;
314
315 /* Do the bulk of the transfer using block mode (if supported). */
316 if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) {
317 /* Blocks per command is limited by host count, host transfer
318 * size and the maximum for IO_RW_EXTENDED of 511 blocks. */
319 max_blocks = min(func->card->host->max_blk_count, 511u);
320
321 while (remainder >= func->cur_blksize) {
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) {
344 size = min(remainder, sdio_max_byte_size(func));
345
346 /* Indicate byte mode by setting "blocks" = 0 */
347 ret = mmc_io_rw_extended(func->card, write, func->num, addr,
348 incr_addr, buf, 0, size);
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
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 */
370u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret)
371{
372 int ret;
373 u8 val;
374
375 if (!func) {
376 if (err_ret)
377 *err_ret = -EINVAL;
378 return 0xFF;
379 }
380
381 ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
382 if (err_ret)
383 *err_ret = ret;
384 if (ret)
385 return 0xFF;
386
387 return val;
388}
389EXPORT_SYMBOL_GPL(sdio_readb);
390
391/**
392 * sdio_writeb - write a single byte to a SDIO function
393 * @func: SDIO function to access
394 * @b: byte to write
395 * @addr: address to write to
396 * @err_ret: optional status value from transfer
397 *
398 * Writes a single byte to the address space of a given SDIO
399 * function. @err_ret will contain the status of the actual
400 * transfer.
401 */
402void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret)
403{
404 int ret;
405
406 if (!func) {
407 if (err_ret)
408 *err_ret = -EINVAL;
409 return;
410 }
411
412 ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
413 if (err_ret)
414 *err_ret = ret;
415}
416EXPORT_SYMBOL_GPL(sdio_writeb);
417
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 */
431u8 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 return 0xff;
443
444 return val;
445}
446EXPORT_SYMBOL_GPL(sdio_writeb_readb);
447
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 *
455 * Reads from the address space of a given SDIO function. Return
456 * value indicates if the transfer succeeded or not.
457 */
458int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
459 unsigned int addr, int count)
460{
461 return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
462}
463EXPORT_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 *
472 * Writes to the address space of a given SDIO function. Return
473 * value indicates if the transfer succeeded or not.
474 */
475int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
476 void *src, int count)
477{
478 return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
479}
480EXPORT_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 *
489 * Reads from the specified FIFO of a given SDIO function. Return
490 * value indicates if the transfer succeeded or not.
491 */
492int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
493 int count)
494{
495 return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
496}
497EXPORT_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 *
506 * Writes to the specified FIFO of a given SDIO function. Return
507 * value indicates if the transfer succeeded or not.
508 */
509int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
510 int count)
511{
512 return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
513}
514EXPORT_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 */
526u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret)
527{
528 int ret;
529
530 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
531 if (err_ret)
532 *err_ret = ret;
533 if (ret)
534 return 0xFFFF;
535
536 return le16_to_cpup((__le16 *)func->tmpbuf);
537}
538EXPORT_SYMBOL_GPL(sdio_readw);
539
540/**
541 * sdio_writew - write a 16 bit integer to a SDIO function
542 * @func: SDIO function to access
543 * @b: integer to write
544 * @addr: address to write to
545 * @err_ret: optional status value from transfer
546 *
547 * Writes a 16 bit integer to the address space of a given SDIO
548 * function. @err_ret will contain the status of the actual
549 * transfer.
550 */
551void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret)
552{
553 int ret;
554
555 *(__le16 *)func->tmpbuf = cpu_to_le16(b);
556
557 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
558 if (err_ret)
559 *err_ret = ret;
560}
561EXPORT_SYMBOL_GPL(sdio_writew);
562
563/**
564 * sdio_readl - read a 32 bit integer from a SDIO function
565 * @func: SDIO function to access
566 * @addr: address to read
567 * @err_ret: optional status value from transfer
568 *
569 * Reads a 32 bit integer from the address space of a given SDIO
570 * function. If there is a problem reading the address,
571 * 0xffffffff is returned and @err_ret will contain the error
572 * code.
573 */
574u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret)
575{
576 int ret;
577
578 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
579 if (err_ret)
580 *err_ret = ret;
581 if (ret)
582 return 0xFFFFFFFF;
583
584 return le32_to_cpup((__le32 *)func->tmpbuf);
585}
586EXPORT_SYMBOL_GPL(sdio_readl);
587
588/**
589 * sdio_writel - write a 32 bit integer to a SDIO function
590 * @func: SDIO function to access
591 * @b: integer to write
592 * @addr: address to write to
593 * @err_ret: optional status value from transfer
594 *
595 * Writes a 32 bit integer to the address space of a given SDIO
596 * function. @err_ret will contain the status of the actual
597 * transfer.
598 */
599void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret)
600{
601 int ret;
602
603 *(__le32 *)func->tmpbuf = cpu_to_le32(b);
604
605 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
606 if (err_ret)
607 *err_ret = ret;
608}
609EXPORT_SYMBOL_GPL(sdio_writel);
610
611/**
612 * sdio_f0_readb - read a single byte from SDIO function 0
613 * @func: an SDIO function of the card
614 * @addr: address to read
615 * @err_ret: optional status value from transfer
616 *
617 * Reads a single byte from the address space of SDIO function 0.
618 * If there is a problem reading the address, 0xff is returned
619 * and @err_ret will contain the error code.
620 */
621unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
622 int *err_ret)
623{
624 int ret;
625 unsigned char val;
626
627 if (!func) {
628 if (err_ret)
629 *err_ret = -EINVAL;
630 return 0xFF;
631 }
632
633 ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
634 if (err_ret)
635 *err_ret = ret;
636 if (ret)
637 return 0xFF;
638
639 return val;
640}
641EXPORT_SYMBOL_GPL(sdio_f0_readb);
642
643/**
644 * sdio_f0_writeb - write a single byte to SDIO function 0
645 * @func: an SDIO function of the card
646 * @b: byte to write
647 * @addr: address to write to
648 * @err_ret: optional status value from transfer
649 *
650 * Writes a single byte to the address space of SDIO function 0.
651 * @err_ret will contain the status of the actual transfer.
652 *
653 * Only writes to the vendor specific CCCR registers (0xF0 -
654 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
655 * writes outside this range.
656 */
657void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
658 int *err_ret)
659{
660 int ret;
661
662 if (!func) {
663 if (err_ret)
664 *err_ret = -EINVAL;
665 return;
666 }
667
668 if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) {
669 if (err_ret)
670 *err_ret = -EINVAL;
671 return;
672 }
673
674 ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
675 if (err_ret)
676 *err_ret = ret;
677}
678EXPORT_SYMBOL_GPL(sdio_f0_writeb);
679
680/**
681 * sdio_get_host_pm_caps - get host power management capabilities
682 * @func: SDIO function attached to host
683 *
684 * Returns a capability bitmask corresponding to power management
685 * features supported by the host controller that the card function
686 * might rely upon during a system suspend. The host doesn't need
687 * to be claimed, nor the function active, for this information to be
688 * obtained.
689 */
690mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func)
691{
692 if (!func)
693 return 0;
694
695 return func->card->host->pm_caps;
696}
697EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps);
698
699/**
700 * sdio_set_host_pm_flags - set wanted host power management capabilities
701 * @func: SDIO function attached to host
702 *
703 * Set a capability bitmask corresponding to wanted host controller
704 * power management features for the upcoming suspend state.
705 * This must be called, if needed, each time the suspend method of
706 * the function driver is called, and must contain only bits that
707 * were returned by sdio_get_host_pm_caps().
708 * The host doesn't need to be claimed, nor the function active,
709 * for this information to be set.
710 */
711int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags)
712{
713 struct mmc_host *host;
714
715 if (!func)
716 return -EINVAL;
717
718 host = func->card->host;
719
720 if (flags & ~host->pm_caps)
721 return -EINVAL;
722
723 /* function suspend methods are serialized, hence no lock needed */
724 host->pm_flags |= flags;
725 return 0;
726}
727EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags);