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;
190 EXPORT_SYMBOL_GPL(sdio_set_block_size);
193 * sdio_align_size - pads a transfer size to a more optimal value
194 * @func: SDIO function
195 * @sz: original transfer size
197 * Pads the original data size with a number of extra bytes in
198 * order to avoid controller bugs and/or performance hits
199 * (e.g. some controllers revert to PIO for certain sizes).
201 * If possible, it will also adjust the size so that it can be
202 * handled in just a single request.
204 * Returns the improved size, which might be unmodified.
206 unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz)
208 unsigned int orig_sz;
209 unsigned int blk_sz, byte_sz;
215 * Do a first check with the controller, in case it
216 * wants to increase the size up to a point where it
217 * might need more than one block.
219 sz = mmc_align_data_size(func->card, sz);
222 * If we can still do this with just a byte transfer, then
225 if ((sz <= func->cur_blksize) && (sz <= 512))
228 if (func->card->cccr.multi_block) {
230 * Check if the transfer is already block aligned
232 if ((sz % func->cur_blksize) == 0)
236 * Realign it so that it can be done with one request,
237 * and recheck if the controller still likes it.
239 blk_sz = ((sz + func->cur_blksize - 1) /
240 func->cur_blksize) * func->cur_blksize;
241 blk_sz = mmc_align_data_size(func->card, blk_sz);
244 * This value is only good if it is still just
247 if ((blk_sz % func->cur_blksize) == 0)
251 * We failed to do one request, but at least try to
252 * pad the remainder properly.
254 byte_sz = mmc_align_data_size(func->card,
255 sz % func->cur_blksize);
256 if ((byte_sz <= func->cur_blksize) && (byte_sz <= 512)) {
257 blk_sz = sz / func->cur_blksize;
258 return blk_sz * func->cur_blksize + byte_sz;
262 * We need multiple requests, so first check that the
263 * controller can handle the chunk size;
265 chunk_sz = mmc_align_data_size(func->card,
266 min(func->cur_blksize, 512u));
267 if (chunk_sz == min(func->cur_blksize, 512u)) {
269 * Fix up the size of the remainder (if any)
271 byte_sz = orig_sz % chunk_sz;
273 byte_sz = mmc_align_data_size(func->card,
277 return (orig_sz / chunk_sz) * chunk_sz + byte_sz;
282 * The controller is simply incapable of transferring the size
283 * we want in decent manner, so just return the original size.
287 EXPORT_SYMBOL_GPL(sdio_align_size);
289 /* Split an arbitrarily sized data transfer into several
290 * IO_RW_EXTENDED commands. */
291 static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
292 unsigned addr, int incr_addr, u8 *buf, unsigned size)
294 unsigned remainder = size;
298 /* Do the bulk of the transfer using block mode (if supported). */
299 if (func->card->cccr.multi_block) {
300 /* Blocks per command is limited by host count, host transfer
301 * size (we only use a single sg entry) and the maximum for
302 * IO_RW_EXTENDED of 511 blocks. */
303 max_blocks = min(min(
304 func->card->host->max_blk_count,
305 func->card->host->max_seg_size / func->cur_blksize),
308 while (remainder > func->cur_blksize) {
311 blocks = remainder / func->cur_blksize;
312 if (blocks > max_blocks)
314 size = blocks * func->cur_blksize;
316 ret = mmc_io_rw_extended(func->card, write,
317 func->num, addr, incr_addr, buf,
318 blocks, func->cur_blksize);
329 /* Write the remainder using byte mode. */
330 while (remainder > 0) {
332 if (size > func->cur_blksize)
333 size = func->cur_blksize;
335 size = 512; /* maximum size for byte mode */
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 unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
371 ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
380 EXPORT_SYMBOL_GPL(sdio_readb);
383 * sdio_writeb - write a single byte to a SDIO function
384 * @func: SDIO function to access
386 * @addr: address to write to
387 * @err_ret: optional status value from transfer
389 * Writes a single byte to the address space of a given SDIO
390 * function. @err_ret will contain the status of the actual
393 void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
400 ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
404 EXPORT_SYMBOL_GPL(sdio_writeb);
407 * sdio_memcpy_fromio - read a chunk of memory from a SDIO function
408 * @func: SDIO function to access
409 * @dst: buffer to store the data
410 * @addr: address to begin reading from
411 * @count: number of bytes to read
413 * Reads from the address space of a given SDIO function. Return
414 * value indicates if the transfer succeeded or not.
416 int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
417 unsigned int addr, int count)
419 return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
421 EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
424 * sdio_memcpy_toio - write a chunk of memory to a SDIO function
425 * @func: SDIO function to access
426 * @addr: address to start writing to
427 * @src: buffer that contains the data to write
428 * @count: number of bytes to write
430 * Writes to the address space of a given SDIO function. Return
431 * value indicates if the transfer succeeded or not.
433 int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
434 void *src, int count)
436 return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
438 EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
441 * sdio_readsb - read from a FIFO on a SDIO function
442 * @func: SDIO function to access
443 * @dst: buffer to store the data
444 * @addr: address of (single byte) FIFO
445 * @count: number of bytes to read
447 * Reads from the specified FIFO of a given SDIO function. Return
448 * value indicates if the transfer succeeded or not.
450 int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
453 return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
456 EXPORT_SYMBOL_GPL(sdio_readsb);
459 * sdio_writesb - write to a FIFO of a SDIO function
460 * @func: SDIO function to access
461 * @addr: address of (single byte) FIFO
462 * @src: buffer that contains the data to write
463 * @count: number of bytes to write
465 * Writes to the specified FIFO of a given SDIO function. Return
466 * value indicates if the transfer succeeded or not.
468 int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
471 return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
473 EXPORT_SYMBOL_GPL(sdio_writesb);
476 * sdio_readw - read a 16 bit integer from a SDIO function
477 * @func: SDIO function to access
478 * @addr: address to read
479 * @err_ret: optional status value from transfer
481 * Reads a 16 bit integer from the address space of a given SDIO
482 * function. If there is a problem reading the address, 0xffff
483 * is returned and @err_ret will contain the error code.
485 unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
493 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
500 return le16_to_cpu(*(u16*)func->tmpbuf);
502 EXPORT_SYMBOL_GPL(sdio_readw);
505 * sdio_writew - write a 16 bit integer to a SDIO function
506 * @func: SDIO function to access
507 * @b: integer to write
508 * @addr: address to write to
509 * @err_ret: optional status value from transfer
511 * Writes a 16 bit integer to the address space of a given SDIO
512 * function. @err_ret will contain the status of the actual
515 void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
520 *(u16*)func->tmpbuf = cpu_to_le16(b);
522 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
526 EXPORT_SYMBOL_GPL(sdio_writew);
529 * sdio_readl - read a 32 bit integer from a SDIO function
530 * @func: SDIO function to access
531 * @addr: address to read
532 * @err_ret: optional status value from transfer
534 * Reads a 32 bit integer from the address space of a given SDIO
535 * function. If there is a problem reading the address,
536 * 0xffffffff is returned and @err_ret will contain the error
539 unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
547 ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
554 return le32_to_cpu(*(u32*)func->tmpbuf);
556 EXPORT_SYMBOL_GPL(sdio_readl);
559 * sdio_writel - write a 32 bit integer to a SDIO function
560 * @func: SDIO function to access
561 * @b: integer to write
562 * @addr: address to write to
563 * @err_ret: optional status value from transfer
565 * Writes a 32 bit integer to the address space of a given SDIO
566 * function. @err_ret will contain the status of the actual
569 void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
574 *(u32*)func->tmpbuf = cpu_to_le32(b);
576 ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
580 EXPORT_SYMBOL_GPL(sdio_writel);
583 * sdio_f0_readb - read a single byte from SDIO function 0
584 * @func: an SDIO function of the card
585 * @addr: address to read
586 * @err_ret: optional status value from transfer
588 * Reads a single byte from the address space of SDIO function 0.
589 * If there is a problem reading the address, 0xff is returned
590 * and @err_ret will contain the error code.
592 unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
603 ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
612 EXPORT_SYMBOL_GPL(sdio_f0_readb);
615 * sdio_f0_writeb - write a single byte to SDIO function 0
616 * @func: an SDIO function of the card
618 * @addr: address to write to
619 * @err_ret: optional status value from transfer
621 * Writes a single byte to the address space of SDIO function 0.
622 * @err_ret will contain the status of the actual transfer.
624 * Only writes to the vendor specific CCCR registers (0xF0 -
625 * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
626 * writes outside this range.
628 void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
635 if (addr < 0xF0 || addr > 0xFF) {
641 ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
645 EXPORT_SYMBOL_GPL(sdio_f0_writeb);