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);
79 timeout = jiffies + msecs_to_jiffies(func->enable_timeout);
82 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®);
85 if (reg & (1 << func->num))
88 if (time_after(jiffies, timeout))
92 pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
97 pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
100 EXPORT_SYMBOL_GPL(sdio_enable_func);
103 * sdio_disable_func - disable a SDIO function
104 * @func: SDIO function to disable
106 * Powers down and deactivates a SDIO function. Register access
107 * to this function will fail until the function is reenabled.
109 int sdio_disable_func(struct sdio_func *func)
117 pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
119 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
123 reg &= ~(1 << func->num);
125 ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
129 pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
134 pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
137 EXPORT_SYMBOL_GPL(sdio_disable_func);
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.
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.
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.
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.
158 int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
162 if (blksz > func->card->host->max_blk_size)
166 blksz = min(func->max_blksize, func->card->host->max_blk_size);
167 blksz = min(blksz, 512u);
170 ret = mmc_io_rw_direct(func->card, 1, 0,
171 SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
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);
180 func->cur_blksize = blksz;
183 EXPORT_SYMBOL_GPL(sdio_set_block_size);
186 * Calculate the maximum byte mode transfer size
188 static inline unsigned int sdio_max_byte_size(struct sdio_func *func)
191 func->card->host->max_seg_size,
192 func->card->host->max_blk_size),
194 512u); /* maximum size for byte mode */
198 * sdio_align_size - pads a transfer size to a more optimal value
199 * @func: SDIO function
200 * @sz: original transfer size
202 * Pads the original data size with a number of extra bytes in
203 * order to avoid controller bugs and/or performance hits
204 * (e.g. some controllers revert to PIO for certain sizes).
206 * If possible, it will also adjust the size so that it can be
207 * handled in just a single request.
209 * Returns the improved size, which might be unmodified.
211 unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
213 unsigned int orig_sz;
214 unsigned int blk_sz, byte_sz;
220 * Do a first check with the controller, in case it
221 * wants to increase the size up to a point where it
222 * might need more than one block.
224 sz = mmc_align_data_size(func->card, sz);
227 * If we can still do this with just a byte transfer, then
230 if (sz <= sdio_max_byte_size(func))
233 if (func->card->cccr.multi_block) {
235 * Check if the transfer is already block aligned
237 if ((sz % func->cur_blksize) == 0)
241 * Realign it so that it can be done with one request,
242 * and recheck if the controller still likes it.
244 blk_sz = ((sz + func->cur_blksize - 1) /
245 func->cur_blksize) * func->cur_blksize;
246 blk_sz = mmc_align_data_size(func->card, blk_sz);
249 * This value is only good if it is still just
252 if ((blk_sz % func->cur_blksize) == 0)
256 * We failed to do one request, but at least try to
257 * pad the remainder properly.
259 byte_sz = mmc_align_data_size(func->card,
260 sz % func->cur_blksize);
261 if (byte_sz <= sdio_max_byte_size(func)) {
262 blk_sz = sz / func->cur_blksize;
263 return blk_sz * func->cur_blksize + byte_sz;
267 * We need multiple requests, so first check that the
268 * controller can handle the chunk size;
270 chunk_sz = mmc_align_data_size(func->card,
271 sdio_max_byte_size(func));
272 if (chunk_sz == sdio_max_byte_size(func)) {
274 * Fix up the size of the remainder (if any)
276 byte_sz = orig_sz % chunk_sz;
278 byte_sz = mmc_align_data_size(func->card,
282 return (orig_sz / chunk_sz) * chunk_sz + byte_sz;
287 * The controller is simply incapable of transferring the size
288 * we want in decent manner, so just return the original size.
292 EXPORT_SYMBOL_GPL(sdio_align_size);
294 /* Split an arbitrarily sized data transfer into several
295 * IO_RW_EXTENDED commands. */
296 static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
297 unsigned addr, int incr_addr, u8 *buf, unsigned size)
299 unsigned remainder = size;
303 /* Do the bulk of the transfer using block mode (if supported). */
304 if (func->card->cccr.multi_block && (size > sdio_max_byte_size(func))) {
305 /* Blocks per command is limited by host count, host transfer
306 * size (we only use a single sg entry) and the maximum for
307 * IO_RW_EXTENDED of 511 blocks. */
308 max_blocks = min(func->card->host->max_blk_count,
309 func->card->host->max_seg_size / func->cur_blksize);
310 max_blocks = min(max_blocks, 511u);
312 while (remainder > func->cur_blksize) {
315 blocks = remainder / func->cur_blksize;
316 if (blocks > max_blocks)
318 size = blocks * func->cur_blksize;
320 ret = mmc_io_rw_extended(func->card, write,
321 func->num, addr, incr_addr, buf,
322 blocks, func->cur_blksize);
333 /* Write the remainder using byte mode. */
334 while (remainder > 0) {
335 size = min(remainder, sdio_max_byte_size(func));
337 ret = mmc_io_rw_extended(func->card, write, func->num, addr,
338 incr_addr, buf, 1, size);
351 * sdio_readb - read a single byte from a SDIO function
352 * @func: SDIO function to access
353 * @addr: address to read
354 * @err_ret: optional status value from transfer
356 * Reads a single byte from the address space of a given SDIO
357 * function. If there is a problem reading the address, 0xff
358 * is returned and @err_ret will contain the error code.
360 u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret)
370 ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
379 EXPORT_SYMBOL_GPL(sdio_readb);
382 * sdio_writeb - write a single byte to a SDIO function
383 * @func: SDIO function to access
385 * @addr: address to write to
386 * @err_ret: optional status value from transfer
388 * Writes a single byte to the address space of a given SDIO
389 * function. @err_ret will contain the status of the actual
392 void sdio_writeb(struct sdio_func *func, u8 b, unsigned int addr, int *err_ret)
398 ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
402 EXPORT_SYMBOL_GPL(sdio_writeb);
405 * sdio_memcpy_fromio - read a chunk of memory from a SDIO function
406 * @func: SDIO function to access
407 * @dst: buffer to store the data
408 * @addr: address to begin reading from
409 * @count: number of bytes to read
411 * Reads from the address space of a given SDIO function. Return
412 * value indicates if the transfer succeeded or not.
414 int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
415 unsigned int addr, int count)
417 return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
419 EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
422 * sdio_memcpy_toio - write a chunk of memory to a SDIO function
423 * @func: SDIO function to access
424 * @addr: address to start writing to
425 * @src: buffer that contains the data to write
426 * @count: number of bytes to write
428 * Writes to the address space of a given SDIO function. Return
429 * value indicates if the transfer succeeded or not.
431 int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
432 void *src, int count)
434 return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
436 EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
439 * sdio_readsb - read from a FIFO on a SDIO function
440 * @func: SDIO function to access
441 * @dst: buffer to store the data
442 * @addr: address of (single byte) FIFO
443 * @count: number of bytes to read
445 * Reads from the specified FIFO of a given SDIO function. Return
446 * value indicates if the transfer succeeded or not.
448 int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
451 return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
453 EXPORT_SYMBOL_GPL(sdio_readsb);
456 * sdio_writesb - write to a FIFO of a SDIO function
457 * @func: SDIO function to access
458 * @addr: address of (single byte) FIFO
459 * @src: buffer that contains the data to write
460 * @count: number of bytes to write
462 * Writes to the specified FIFO of a given SDIO function. Return
463 * value indicates if the transfer succeeded or not.
465 int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
468 return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
470 EXPORT_SYMBOL_GPL(sdio_writesb);
473 * sdio_readw - read a 16 bit integer from a SDIO function
474 * @func: SDIO function to access
475 * @addr: address to read
476 * @err_ret: optional status value from transfer
478 * Reads a 16 bit integer from the address space of a given SDIO
479 * function. If there is a problem reading the address, 0xffff
480 * is returned and @err_ret will contain the error code.
482 u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret)
489 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
496 return le16_to_cpup((__le16 *)func->tmpbuf);
498 EXPORT_SYMBOL_GPL(sdio_readw);
501 * sdio_writew - write a 16 bit integer to a SDIO function
502 * @func: SDIO function to access
503 * @b: integer to write
504 * @addr: address to write to
505 * @err_ret: optional status value from transfer
507 * Writes a 16 bit integer to the address space of a given SDIO
508 * function. @err_ret will contain the status of the actual
511 void sdio_writew(struct sdio_func *func, u16 b, unsigned int addr, int *err_ret)
515 *(__le16 *)func->tmpbuf = cpu_to_le16(b);
517 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
521 EXPORT_SYMBOL_GPL(sdio_writew);
524 * sdio_readl - read a 32 bit integer from a SDIO function
525 * @func: SDIO function to access
526 * @addr: address to read
527 * @err_ret: optional status value from transfer
529 * Reads a 32 bit integer from the address space of a given SDIO
530 * function. If there is a problem reading the address,
531 * 0xffffffff is returned and @err_ret will contain the error
534 u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret)
541 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
548 return le32_to_cpup((__le32 *)func->tmpbuf);
550 EXPORT_SYMBOL_GPL(sdio_readl);
553 * sdio_writel - write a 32 bit integer to a SDIO function
554 * @func: SDIO function to access
555 * @b: integer to write
556 * @addr: address to write to
557 * @err_ret: optional status value from transfer
559 * Writes a 32 bit integer to the address space of a given SDIO
560 * function. @err_ret will contain the status of the actual
563 void sdio_writel(struct sdio_func *func, u32 b, unsigned int addr, int *err_ret)
567 *(__le32 *)func->tmpbuf = cpu_to_le32(b);
569 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
573 EXPORT_SYMBOL_GPL(sdio_writel);
576 * sdio_f0_readb - read a single byte from SDIO function 0
577 * @func: an SDIO function of the card
578 * @addr: address to read
579 * @err_ret: optional status value from transfer
581 * Reads a single byte from the address space of SDIO function 0.
582 * If there is a problem reading the address, 0xff is returned
583 * and @err_ret will contain the error code.
585 unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
596 ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
605 EXPORT_SYMBOL_GPL(sdio_f0_readb);
608 * sdio_f0_writeb - write a single byte to SDIO function 0
609 * @func: an SDIO function of the card
611 * @addr: address to write to
612 * @err_ret: optional status value from transfer
614 * Writes a single byte to the address space of SDIO function 0.
615 * @err_ret will contain the status of the actual transfer.
617 * Only writes to the vendor specific CCCR registers (0xF0 -
618 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
619 * writes outside this range.
621 void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
628 if (addr < 0xF0 || addr > 0xFF) {
634 ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
638 EXPORT_SYMBOL_GPL(sdio_f0_writeb);