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/mmc/host.h>
13 #include <linux/mmc/card.h>
14 #include <linux/mmc/sdio.h>
15 #include <linux/mmc/sdio_func.h>
20 * sdio_claim_host - exclusively claim a bus for a certain SDIO function
21 * @func: SDIO function that will be accessed
23 * Claim a bus for a set of operations. The SDIO function given
24 * is used to figure out which bus is relevant.
26 void sdio_claim_host(struct sdio_func *func)
31 mmc_claim_host(func->card->host);
33 EXPORT_SYMBOL_GPL(sdio_claim_host);
36 * sdio_release_host - release a bus for a certain SDIO function
37 * @func: SDIO function that was accessed
39 * Release a bus, allowing others to claim the bus for their
42 void sdio_release_host(struct sdio_func *func)
47 mmc_release_host(func->card->host);
49 EXPORT_SYMBOL_GPL(sdio_release_host);
52 * sdio_enable_func - enables a SDIO function for usage
53 * @func: SDIO function to enable
55 * Powers up and activates a SDIO function so that register
58 int sdio_enable_func(struct sdio_func *func)
62 unsigned long timeout;
67 pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
69 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
73 reg |= 1 << func->num;
75 ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
80 * FIXME: This should timeout based on information in the CIS,
81 * but we don't have card to parse that yet.
83 timeout = jiffies + HZ;
86 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®);
89 if (reg & (1 << func->num))
92 if (time_after(jiffies, timeout))
96 pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
101 pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
104 EXPORT_SYMBOL_GPL(sdio_enable_func);
107 * sdio_disable_func - disable a SDIO function
108 * @func: SDIO function to disable
110 * Powers down and deactivates a SDIO function. Register access
111 * to this function will fail until the function is reenabled.
113 int sdio_disable_func(struct sdio_func *func)
121 pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
123 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
127 reg &= ~(1 << func->num);
129 ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
133 pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
138 pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
141 EXPORT_SYMBOL_GPL(sdio_disable_func);
144 * sdio_set_block_size - set the block size of an SDIO function
145 * @func: SDIO function to change
146 * @blksz: new block size or 0 to use the default.
148 * The default block size is the largest supported by both the function
149 * and the host, with a maximum of 512 to ensure that arbitrarily sized
150 * data transfer use the optimal (least) number of commands.
152 * A driver may call this to override the default block size set by the
153 * core. This can be used to set a block size greater than the maximum
154 * that reported by the card; it is the driver's responsibility to ensure
155 * it uses a value that the card supports.
157 * Returns 0 on success, -EINVAL if the host does not support the
158 * requested block size, or -EIO (etc.) if one of the resultant FBR block
159 * size register writes failed.
162 int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
166 if (blksz > func->card->host->max_blk_size)
172 func->card->host->max_blk_size),
176 ret = mmc_io_rw_direct(func->card, 1, 0,
177 SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
181 ret = mmc_io_rw_direct(func->card, 1, 0,
182 SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1,
183 (blksz >> 8) & 0xff, NULL);
186 func->cur_blksize = blksz;
189 EXPORT_SYMBOL_GPL(sdio_set_block_size);
192 * Calculate the maximum byte mode transfer size
194 static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
197 func->card->host->max_seg_size,
198 func->card->host->max_blk_size),
200 512u); /* maximum size for byte mode */
204 * sdio_align_size - pads a transfer size to a more optimal value
205 * @func: SDIO function
206 * @sz: original transfer size
208 * Pads the original data size with a number of extra bytes in
209 * order to avoid controller bugs and/or performance hits
210 * (e.g. some controllers revert to PIO for certain sizes).
212 * If possible, it will also adjust the size so that it can be
213 * handled in just a single request.
215 * Returns the improved size, which might be unmodified.
217 unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
219 unsigned int orig_sz;
220 unsigned int blk_sz, byte_sz;
226 * Do a first check with the controller, in case it
227 * wants to increase the size up to a point where it
228 * might need more than one block.
230 sz = mmc_align_data_size(func->card, sz);
233 * If we can still do this with just a byte transfer, then
236 if (sz <= sdio_max_byte_size(func))
239 if (func->card->cccr.multi_block) {
241 * Check if the transfer is already block aligned
243 if ((sz % func->cur_blksize) == 0)
247 * Realign it so that it can be done with one request,
248 * and recheck if the controller still likes it.
250 blk_sz = ((sz + func->cur_blksize - 1) /
251 func->cur_blksize) * func->cur_blksize;
252 blk_sz = mmc_align_data_size(func->card, blk_sz);
255 * This value is only good if it is still just
258 if ((blk_sz % func->cur_blksize) == 0)
262 * We failed to do one request, but at least try to
263 * pad the remainder properly.
265 byte_sz = mmc_align_data_size(func->card,
266 sz % func->cur_blksize);
267 if (byte_sz <= sdio_max_byte_size(func)) {
268 blk_sz = sz / func->cur_blksize;
269 return blk_sz * func->cur_blksize + byte_sz;
273 * We need multiple requests, so first check that the
274 * controller can handle the chunk size;
276 chunk_sz = mmc_align_data_size(func->card,
277 sdio_max_byte_size(func));
278 if (chunk_sz == sdio_max_byte_size(func)) {
280 * Fix up the size of the remainder (if any)
282 byte_sz = orig_sz % chunk_sz;
284 byte_sz = mmc_align_data_size(func->card,
288 return (orig_sz / chunk_sz) * chunk_sz + byte_sz;
293 * The controller is simply incapable of transferring the size
294 * we want in decent manner, so just return the original size.
298 EXPORT_SYMBOL_GPL(sdio_align_size);
300 /* Split an arbitrarily sized data transfer into several
301 * IO_RW_EXTENDED commands. */
302 static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
303 unsigned addr, int incr_addr, u8 *buf, unsigned size)
305 unsigned remainder = size;
309 /* Do the bulk of the transfer using block mode (if supported). */
310 if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) {
311 /* Blocks per command is limited by host count, host transfer
312 * size (we only use a single sg entry) and the maximum for
313 * IO_RW_EXTENDED of 511 blocks. */
314 max_blocks = min(min(
315 func->card->host->max_blk_count,
316 func->card->host->max_seg_size / func->cur_blksize),
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 ret = mmc_io_rw_extended(func->card, write, func->num, addr,
345 incr_addr, buf, 1, size);
358 * sdio_readb - read a single byte from a SDIO function
359 * @func: SDIO function to access
360 * @addr: address to read
361 * @err_ret: optional status value from transfer
363 * Reads a single byte from the address space of a given SDIO
364 * function. If there is a problem reading the address, 0xff
365 * is returned and @err_ret will contain the error code.
367 unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
378 ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
387 EXPORT_SYMBOL_GPL(sdio_readb);
390 * sdio_writeb - write a single byte to a SDIO function
391 * @func: SDIO function to access
393 * @addr: address to write to
394 * @err_ret: optional status value from transfer
396 * Writes a single byte to the address space of a given SDIO
397 * function. @err_ret will contain the status of the actual
400 void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
407 ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
411 EXPORT_SYMBOL_GPL(sdio_writeb);
414 * sdio_memcpy_fromio - read a chunk of memory from a SDIO function
415 * @func: SDIO function to access
416 * @dst: buffer to store the data
417 * @addr: address to begin reading from
418 * @count: number of bytes to read
420 * Reads from the address space of a given SDIO function. Return
421 * value indicates if the transfer succeeded or not.
423 int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
424 unsigned int addr, int count)
426 return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
428 EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
431 * sdio_memcpy_toio - write a chunk of memory to a SDIO function
432 * @func: SDIO function to access
433 * @addr: address to start writing to
434 * @src: buffer that contains the data to write
435 * @count: number of bytes to write
437 * Writes to the address space of a given SDIO function. Return
438 * value indicates if the transfer succeeded or not.
440 int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
441 void *src, int count)
443 return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
445 EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
448 * sdio_readsb - read from a FIFO on a SDIO function
449 * @func: SDIO function to access
450 * @dst: buffer to store the data
451 * @addr: address of (single byte) FIFO
452 * @count: number of bytes to read
454 * Reads from the specified FIFO of a given SDIO function. Return
455 * value indicates if the transfer succeeded or not.
457 int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
460 return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
463 EXPORT_SYMBOL_GPL(sdio_readsb);
466 * sdio_writesb - write to a FIFO of a SDIO function
467 * @func: SDIO function to access
468 * @addr: address of (single byte) FIFO
469 * @src: buffer that contains the data to write
470 * @count: number of bytes to write
472 * Writes to the specified FIFO of a given SDIO function. Return
473 * value indicates if the transfer succeeded or not.
475 int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
478 return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
480 EXPORT_SYMBOL_GPL(sdio_writesb);
483 * sdio_readw - read a 16 bit integer from a SDIO function
484 * @func: SDIO function to access
485 * @addr: address to read
486 * @err_ret: optional status value from transfer
488 * Reads a 16 bit integer from the address space of a given SDIO
489 * function. If there is a problem reading the address, 0xffff
490 * is returned and @err_ret will contain the error code.
492 unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
500 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
507 return le16_to_cpu(*(u16*)func->tmpbuf);
509 EXPORT_SYMBOL_GPL(sdio_readw);
512 * sdio_writew - write a 16 bit integer to a SDIO function
513 * @func: SDIO function to access
514 * @b: integer to write
515 * @addr: address to write to
516 * @err_ret: optional status value from transfer
518 * Writes a 16 bit integer to the address space of a given SDIO
519 * function. @err_ret will contain the status of the actual
522 void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
527 *(u16*)func->tmpbuf = cpu_to_le16(b);
529 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
533 EXPORT_SYMBOL_GPL(sdio_writew);
536 * sdio_readl - read a 32 bit integer from a SDIO function
537 * @func: SDIO function to access
538 * @addr: address to read
539 * @err_ret: optional status value from transfer
541 * Reads a 32 bit integer from the address space of a given SDIO
542 * function. If there is a problem reading the address,
543 * 0xffffffff is returned and @err_ret will contain the error
546 unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
554 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
561 return le32_to_cpu(*(u32*)func->tmpbuf);
563 EXPORT_SYMBOL_GPL(sdio_readl);
566 * sdio_writel - write a 32 bit integer to a SDIO function
567 * @func: SDIO function to access
568 * @b: integer to write
569 * @addr: address to write to
570 * @err_ret: optional status value from transfer
572 * Writes a 32 bit integer to the address space of a given SDIO
573 * function. @err_ret will contain the status of the actual
576 void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
581 *(u32*)func->tmpbuf = cpu_to_le32(b);
583 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
587 EXPORT_SYMBOL_GPL(sdio_writel);
590 * sdio_f0_readb - read a single byte from SDIO function 0
591 * @func: an SDIO function of the card
592 * @addr: address to read
593 * @err_ret: optional status value from transfer
595 * Reads a single byte from the address space of SDIO function 0.
596 * If there is a problem reading the address, 0xff is returned
597 * and @err_ret will contain the error code.
599 unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
610 ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
619 EXPORT_SYMBOL_GPL(sdio_f0_readb);
622 * sdio_f0_writeb - write a single byte to SDIO function 0
623 * @func: an SDIO function of the card
625 * @addr: address to write to
626 * @err_ret: optional status value from transfer
628 * Writes a single byte to the address space of SDIO function 0.
629 * @err_ret will contain the status of the actual transfer.
631 * Only writes to the vendor specific CCCR registers (0xF0 -
632 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
633 * writes outside this range.
635 void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
642 if (addr < 0xF0 || addr > 0xFF) {
648 ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
652 EXPORT_SYMBOL_GPL(sdio_f0_writeb);