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