2 * linux/drivers/mmc/core/sdio_io.c
4 * Copyright 2007-2008 Pierre Ossman
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.
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>
21 * sdio_claim_host - exclusively claim a bus for a certain SDIO function
22 * @func: SDIO function that will be accessed
24 * Claim a bus for a set of operations. The SDIO function given
25 * is used to figure out which bus is relevant.
27 void sdio_claim_host(struct sdio_func
*func
)
32 mmc_claim_host(func
->card
->host
);
34 EXPORT_SYMBOL_GPL(sdio_claim_host
);
37 * sdio_release_host - release a bus for a certain SDIO function
38 * @func: SDIO function that was accessed
40 * Release a bus, allowing others to claim the bus for their
43 void sdio_release_host(struct sdio_func
*func
)
48 mmc_release_host(func
->card
->host
);
50 EXPORT_SYMBOL_GPL(sdio_release_host
);
53 * sdio_enable_func - enables a SDIO function for usage
54 * @func: SDIO function to enable
56 * Powers up and activates a SDIO function so that register
59 int sdio_enable_func(struct sdio_func
*func
)
63 unsigned long timeout
;
68 pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func
));
70 ret
= mmc_io_rw_direct(func
->card
, 0, 0, SDIO_CCCR_IOEx
, 0, ®
);
74 reg
|= 1 << func
->num
;
76 ret
= mmc_io_rw_direct(func
->card
, 1, 0, SDIO_CCCR_IOEx
, reg
, NULL
);
80 timeout
= jiffies
+ msecs_to_jiffies(func
->enable_timeout
);
83 ret
= mmc_io_rw_direct(func
->card
, 0, 0, SDIO_CCCR_IORx
, 0, ®
);
86 if (reg
& (1 << func
->num
))
89 if (time_after(jiffies
, timeout
))
93 pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func
));
98 pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func
));
101 EXPORT_SYMBOL_GPL(sdio_enable_func
);
104 * sdio_disable_func - disable a SDIO function
105 * @func: SDIO function to disable
107 * Powers down and deactivates a SDIO function. Register access
108 * to this function will fail until the function is reenabled.
110 int sdio_disable_func(struct sdio_func
*func
)
118 pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func
));
120 ret
= mmc_io_rw_direct(func
->card
, 0, 0, SDIO_CCCR_IOEx
, 0, ®
);
124 reg
&= ~(1 << func
->num
);
126 ret
= mmc_io_rw_direct(func
->card
, 1, 0, SDIO_CCCR_IOEx
, reg
, NULL
);
130 pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func
));
135 pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func
));
138 EXPORT_SYMBOL_GPL(sdio_disable_func
);
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.
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.
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.
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.
159 int sdio_set_block_size(struct sdio_func
*func
, unsigned blksz
)
163 if (blksz
> func
->card
->host
->max_blk_size
)
167 blksz
= min(func
->max_blksize
, func
->card
->host
->max_blk_size
);
168 blksz
= min(blksz
, 512u);
171 ret
= mmc_io_rw_direct(func
->card
, 1, 0,
172 SDIO_FBR_BASE(func
->num
) + SDIO_FBR_BLKSIZE
,
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
);
181 func
->cur_blksize
= blksz
;
184 EXPORT_SYMBOL_GPL(sdio_set_block_size
);
187 * Calculate the maximum byte mode transfer size
189 static inline unsigned int sdio_max_byte_size(struct sdio_func
*func
)
191 unsigned mval
= func
->card
->host
->max_blk_size
;
193 if (mmc_blksz_for_byte_mode(func
->card
))
194 mval
= min(mval
, func
->cur_blksize
);
196 mval
= min(mval
, func
->max_blksize
);
198 if (mmc_card_broken_byte_mode_512(func
->card
))
199 return min(mval
, 511u);
201 return min(mval
, 512u); /* maximum size for byte mode */
205 * sdio_align_size - pads a transfer size to a more optimal value
206 * @func: SDIO function
207 * @sz: original transfer size
209 * Pads the original data size with a number of extra bytes in
210 * order to avoid controller bugs and/or performance hits
211 * (e.g. some controllers revert to PIO for certain sizes).
213 * If possible, it will also adjust the size so that it can be
214 * handled in just a single request.
216 * Returns the improved size, which might be unmodified.
218 unsigned int sdio_align_size(struct sdio_func
*func
, unsigned int sz
)
220 unsigned int orig_sz
;
221 unsigned int blk_sz
, byte_sz
;
227 * Do a first check with the controller, in case it
228 * wants to increase the size up to a point where it
229 * might need more than one block.
231 sz
= mmc_align_data_size(func
->card
, sz
);
234 * If we can still do this with just a byte transfer, then
237 if (sz
<= sdio_max_byte_size(func
))
240 if (func
->card
->cccr
.multi_block
) {
242 * Check if the transfer is already block aligned
244 if ((sz
% func
->cur_blksize
) == 0)
248 * Realign it so that it can be done with one request,
249 * and recheck if the controller still likes it.
251 blk_sz
= ((sz
+ func
->cur_blksize
- 1) /
252 func
->cur_blksize
) * func
->cur_blksize
;
253 blk_sz
= mmc_align_data_size(func
->card
, blk_sz
);
256 * This value is only good if it is still just
259 if ((blk_sz
% func
->cur_blksize
) == 0)
263 * We failed to do one request, but at least try to
264 * pad the remainder properly.
266 byte_sz
= mmc_align_data_size(func
->card
,
267 sz
% func
->cur_blksize
);
268 if (byte_sz
<= sdio_max_byte_size(func
)) {
269 blk_sz
= sz
/ func
->cur_blksize
;
270 return blk_sz
* func
->cur_blksize
+ byte_sz
;
274 * We need multiple requests, so first check that the
275 * controller can handle the chunk size;
277 chunk_sz
= mmc_align_data_size(func
->card
,
278 sdio_max_byte_size(func
));
279 if (chunk_sz
== sdio_max_byte_size(func
)) {
281 * Fix up the size of the remainder (if any)
283 byte_sz
= orig_sz
% chunk_sz
;
285 byte_sz
= mmc_align_data_size(func
->card
,
289 return (orig_sz
/ chunk_sz
) * chunk_sz
+ byte_sz
;
294 * The controller is simply incapable of transferring the size
295 * we want in decent manner, so just return the original size.
299 EXPORT_SYMBOL_GPL(sdio_align_size
);
301 /* Split an arbitrarily sized data transfer into several
302 * IO_RW_EXTENDED commands. */
303 static int sdio_io_rw_ext_helper(struct sdio_func
*func
, int write
,
304 unsigned addr
, int incr_addr
, u8
*buf
, unsigned size
)
306 unsigned remainder
= size
;
310 if (!func
|| (func
->num
> 7))
313 /* Do the bulk of the transfer using block mode (if supported). */
314 if (func
->card
->cccr
.multi_block
&& (size
> sdio_max_byte_size(func
))) {
315 /* Blocks per command is limited by host count, host transfer
316 * size and the maximum for IO_RW_EXTENDED of 511 blocks. */
317 max_blocks
= min(func
->card
->host
->max_blk_count
, 511u);
319 while (remainder
>= func
->cur_blksize
) {
322 blocks
= remainder
/ func
->cur_blksize
;
323 if (blocks
> max_blocks
)
325 size
= blocks
* func
->cur_blksize
;
327 ret
= mmc_io_rw_extended(func
->card
, write
,
328 func
->num
, addr
, incr_addr
, buf
,
329 blocks
, func
->cur_blksize
);
340 /* Write the remainder using byte mode. */
341 while (remainder
> 0) {
342 size
= min(remainder
, sdio_max_byte_size(func
));
344 /* Indicate byte mode by setting "blocks" = 0 */
345 ret
= mmc_io_rw_extended(func
->card
, write
, func
->num
, addr
,
346 incr_addr
, buf
, 0, size
);
359 * sdio_readb - read a single byte from a SDIO function
360 * @func: SDIO function to access
361 * @addr: address to read
362 * @err_ret: optional status value from transfer
364 * Reads a single byte from the address space of a given SDIO
365 * function. If there is a problem reading the address, 0xff
366 * is returned and @err_ret will contain the error code.
368 u8
sdio_readb(struct sdio_func
*func
, unsigned int addr
, int *err_ret
)
381 ret
= mmc_io_rw_direct(func
->card
, 0, func
->num
, addr
, 0, &val
);
390 EXPORT_SYMBOL_GPL(sdio_readb
);
393 * sdio_writeb - write a single byte to a SDIO function
394 * @func: SDIO function to access
396 * @addr: address to write to
397 * @err_ret: optional status value from transfer
399 * Writes a single byte to the address space of a given SDIO
400 * function. @err_ret will contain the status of the actual
403 void sdio_writeb(struct sdio_func
*func
, u8 b
, unsigned int addr
, int *err_ret
)
412 ret
= mmc_io_rw_direct(func
->card
, 1, func
->num
, addr
, b
, NULL
);
416 EXPORT_SYMBOL_GPL(sdio_writeb
);
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
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.
431 u8
sdio_writeb_readb(struct sdio_func
*func
, u8 write_byte
,
432 unsigned int addr
, int *err_ret
)
437 ret
= mmc_io_rw_direct(func
->card
, 1, func
->num
, addr
,
446 EXPORT_SYMBOL_GPL(sdio_writeb_readb
);
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
455 * Reads from the address space of a given SDIO function. Return
456 * value indicates if the transfer succeeded or not.
458 int sdio_memcpy_fromio(struct sdio_func
*func
, void *dst
,
459 unsigned int addr
, int count
)
461 return sdio_io_rw_ext_helper(func
, 0, addr
, 1, dst
, count
);
463 EXPORT_SYMBOL_GPL(sdio_memcpy_fromio
);
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
472 * Writes to the address space of a given SDIO function. Return
473 * value indicates if the transfer succeeded or not.
475 int sdio_memcpy_toio(struct sdio_func
*func
, unsigned int addr
,
476 void *src
, int count
)
478 return sdio_io_rw_ext_helper(func
, 1, addr
, 1, src
, count
);
480 EXPORT_SYMBOL_GPL(sdio_memcpy_toio
);
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
489 * Reads from the specified FIFO of a given SDIO function. Return
490 * value indicates if the transfer succeeded or not.
492 int sdio_readsb(struct sdio_func
*func
, void *dst
, unsigned int addr
,
495 return sdio_io_rw_ext_helper(func
, 0, addr
, 0, dst
, count
);
497 EXPORT_SYMBOL_GPL(sdio_readsb
);
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
506 * Writes to the specified FIFO of a given SDIO function. Return
507 * value indicates if the transfer succeeded or not.
509 int sdio_writesb(struct sdio_func
*func
, unsigned int addr
, void *src
,
512 return sdio_io_rw_ext_helper(func
, 1, addr
, 0, src
, count
);
514 EXPORT_SYMBOL_GPL(sdio_writesb
);
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
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.
526 u16
sdio_readw(struct sdio_func
*func
, unsigned int addr
, int *err_ret
)
533 ret
= sdio_memcpy_fromio(func
, func
->tmpbuf
, addr
, 2);
540 return le16_to_cpup((__le16
*)func
->tmpbuf
);
542 EXPORT_SYMBOL_GPL(sdio_readw
);
545 * sdio_writew - write a 16 bit integer to a SDIO function
546 * @func: SDIO function to access
547 * @b: integer to write
548 * @addr: address to write to
549 * @err_ret: optional status value from transfer
551 * Writes a 16 bit integer to the address space of a given SDIO
552 * function. @err_ret will contain the status of the actual
555 void sdio_writew(struct sdio_func
*func
, u16 b
, unsigned int addr
, int *err_ret
)
559 *(__le16
*)func
->tmpbuf
= cpu_to_le16(b
);
561 ret
= sdio_memcpy_toio(func
, addr
, func
->tmpbuf
, 2);
565 EXPORT_SYMBOL_GPL(sdio_writew
);
568 * sdio_readl - read a 32 bit integer from a SDIO function
569 * @func: SDIO function to access
570 * @addr: address to read
571 * @err_ret: optional status value from transfer
573 * Reads a 32 bit integer from the address space of a given SDIO
574 * function. If there is a problem reading the address,
575 * 0xffffffff is returned and @err_ret will contain the error
578 u32
sdio_readl(struct sdio_func
*func
, unsigned int addr
, int *err_ret
)
585 ret
= sdio_memcpy_fromio(func
, func
->tmpbuf
, addr
, 4);
592 return le32_to_cpup((__le32
*)func
->tmpbuf
);
594 EXPORT_SYMBOL_GPL(sdio_readl
);
597 * sdio_writel - write a 32 bit integer to a SDIO function
598 * @func: SDIO function to access
599 * @b: integer to write
600 * @addr: address to write to
601 * @err_ret: optional status value from transfer
603 * Writes a 32 bit integer to the address space of a given SDIO
604 * function. @err_ret will contain the status of the actual
607 void sdio_writel(struct sdio_func
*func
, u32 b
, unsigned int addr
, int *err_ret
)
611 *(__le32
*)func
->tmpbuf
= cpu_to_le32(b
);
613 ret
= sdio_memcpy_toio(func
, addr
, func
->tmpbuf
, 4);
617 EXPORT_SYMBOL_GPL(sdio_writel
);
620 * sdio_f0_readb - read a single byte from SDIO function 0
621 * @func: an SDIO function of the card
622 * @addr: address to read
623 * @err_ret: optional status value from transfer
625 * Reads a single byte from the address space of SDIO function 0.
626 * If there is a problem reading the address, 0xff is returned
627 * and @err_ret will contain the error code.
629 unsigned char sdio_f0_readb(struct sdio_func
*func
, unsigned int addr
,
643 ret
= mmc_io_rw_direct(func
->card
, 0, 0, addr
, 0, &val
);
652 EXPORT_SYMBOL_GPL(sdio_f0_readb
);
655 * sdio_f0_writeb - write a single byte to SDIO function 0
656 * @func: an SDIO function of the card
658 * @addr: address to write to
659 * @err_ret: optional status value from transfer
661 * Writes a single byte to the address space of SDIO function 0.
662 * @err_ret will contain the status of the actual transfer.
664 * Only writes to the vendor specific CCCR registers (0xF0 -
665 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
666 * writes outside this range.
668 void sdio_f0_writeb(struct sdio_func
*func
, unsigned char b
, unsigned int addr
,
678 if ((addr
< 0xF0 || addr
> 0xFF) && (!mmc_card_lenient_fn0(func
->card
))) {
684 ret
= mmc_io_rw_direct(func
->card
, 1, 0, addr
, b
, NULL
);
688 EXPORT_SYMBOL_GPL(sdio_f0_writeb
);
691 * sdio_get_host_pm_caps - get host power management capabilities
692 * @func: SDIO function attached to host
694 * Returns a capability bitmask corresponding to power management
695 * features supported by the host controller that the card function
696 * might rely upon during a system suspend. The host doesn't need
697 * to be claimed, nor the function active, for this information to be
700 mmc_pm_flag_t
sdio_get_host_pm_caps(struct sdio_func
*func
)
705 return func
->card
->host
->pm_caps
;
707 EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps
);
710 * sdio_set_host_pm_flags - set wanted host power management capabilities
711 * @func: SDIO function attached to host
713 * Set a capability bitmask corresponding to wanted host controller
714 * power management features for the upcoming suspend state.
715 * This must be called, if needed, each time the suspend method of
716 * the function driver is called, and must contain only bits that
717 * were returned by sdio_get_host_pm_caps().
718 * The host doesn't need to be claimed, nor the function active,
719 * for this information to be set.
721 int sdio_set_host_pm_flags(struct sdio_func
*func
, mmc_pm_flag_t flags
)
723 struct mmc_host
*host
;
728 host
= func
->card
->host
;
730 if (flags
& ~host
->pm_caps
)
733 /* function suspend methods are serialized, hence no lock needed */
734 host
->pm_flags
|= flags
;
737 EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags
);
This page took 0.045133 seconds and 5 git commands to generate.