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mmc,sdio: helper function for transfer padding

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There are a lot of crappy controllers out there that cannot handle
all the request sizes that the MMC/SD/SDIO specifications require.
In case the card driver can pad the data to overcome the problems,
this commit adds a helper that calculates how much that padding
should be.

A corresponding helper is also added for SDIO, but it can also deal
with all the complexities of splitting up a large transfer efficiently.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman
2008-06-28 12:52:45 +02:00
parent e2d2647702
commit ad3868b2ec
5 changed files with 137 additions and 16 deletions
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1
include/linux/mmc/core.h
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@ -135,6 +135,7 @@ extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
struct mmc_command *, int);
extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
extern unsigned int mmc_align_data_size(struct mmc_card *, unsigned int);
extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
extern void mmc_release_host(struct mmc_host *host);

4
include/linux/mmc/sdio_func.h
View File

@ -1,7 +1,7 @@
/*
* include/linux/mmc/sdio_func.h
*
* Copyright 2007 Pierre Ossman
* Copyright 2007-2008 Pierre Ossman
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -120,6 +120,8 @@ extern int sdio_set_block_size(struct sdio_func *func, unsigned blksz);
extern int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler);
extern int sdio_release_irq(struct sdio_func *func);
extern unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz);
extern unsigned char sdio_readb(struct sdio_func *func,
unsigned int addr, int *err_ret);
extern unsigned short sdio_readw(struct sdio_func *func,