mirror of
https://github.com/torvalds/linux
synced 2024-10-25 12:49:03 +00:00
9a08f82b3c
Before a driver is probed, set the function's block size to the default so the driver is sure the block size is something sensible and it needn't explicitly set it. The default block size is the largest that's supported by both the card and the host, with a maximum of 512 to ensure aribitrarily sized transfer use the optimal (least) number of commands. See http://lkml.org/lkml/2007/8/7/150 for reasons for the block size choice. Signed-off-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
432 lines
10 KiB
C
432 lines
10 KiB
C
/*
|
|
* linux/drivers/mmc/core/sdio_io.c
|
|
*
|
|
* Copyright 2007 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
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*/
|
|
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/sdio.h>
|
|
#include <linux/mmc/sdio_func.h>
|
|
|
|
#include "sdio_ops.h"
|
|
|
|
/**
|
|
* sdio_claim_host - exclusively claim a bus for a certain SDIO function
|
|
* @func: SDIO function that will be accessed
|
|
*
|
|
* Claim a bus for a set of operations. The SDIO function given
|
|
* is used to figure out which bus is relevant.
|
|
*/
|
|
void sdio_claim_host(struct sdio_func *func)
|
|
{
|
|
BUG_ON(!func);
|
|
BUG_ON(!func->card);
|
|
|
|
mmc_claim_host(func->card->host);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_claim_host);
|
|
|
|
/**
|
|
* sdio_release_host - release a bus for a certain SDIO function
|
|
* @func: SDIO function that was accessed
|
|
*
|
|
* Release a bus, allowing others to claim the bus for their
|
|
* operations.
|
|
*/
|
|
void sdio_release_host(struct sdio_func *func)
|
|
{
|
|
BUG_ON(!func);
|
|
BUG_ON(!func->card);
|
|
|
|
mmc_release_host(func->card->host);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_release_host);
|
|
|
|
/**
|
|
* sdio_enable_func - enables a SDIO function for usage
|
|
* @func: SDIO function to enable
|
|
*
|
|
* Powers up and activates a SDIO function so that register
|
|
* access is possible.
|
|
*/
|
|
int sdio_enable_func(struct sdio_func *func)
|
|
{
|
|
int ret;
|
|
unsigned char reg;
|
|
unsigned long timeout;
|
|
|
|
BUG_ON(!func);
|
|
BUG_ON(!func->card);
|
|
|
|
pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
|
|
|
|
ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
|
|
if (ret)
|
|
goto err;
|
|
|
|
reg |= 1 << func->num;
|
|
|
|
ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/*
|
|
* FIXME: This should timeout based on information in the CIS,
|
|
* but we don't have card to parse that yet.
|
|
*/
|
|
timeout = jiffies + HZ;
|
|
|
|
while (1) {
|
|
ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®);
|
|
if (ret)
|
|
goto err;
|
|
if (reg & (1 << func->num))
|
|
break;
|
|
ret = -ETIME;
|
|
if (time_after(jiffies, timeout))
|
|
goto err;
|
|
}
|
|
|
|
pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
|
|
|
|
return 0;
|
|
|
|
err:
|
|
pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_enable_func);
|
|
|
|
/**
|
|
* sdio_disable_func - disable a SDIO function
|
|
* @func: SDIO function to disable
|
|
*
|
|
* Powers down and deactivates a SDIO function. Register access
|
|
* to this function will fail until the function is reenabled.
|
|
*/
|
|
int sdio_disable_func(struct sdio_func *func)
|
|
{
|
|
int ret;
|
|
unsigned char reg;
|
|
|
|
BUG_ON(!func);
|
|
BUG_ON(!func->card);
|
|
|
|
pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
|
|
|
|
ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
|
|
if (ret)
|
|
goto err;
|
|
|
|
reg &= ~(1 << func->num);
|
|
|
|
ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
|
|
if (ret)
|
|
goto err;
|
|
|
|
pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
|
|
|
|
return 0;
|
|
|
|
err:
|
|
pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
|
|
return -EIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_disable_func);
|
|
|
|
/**
|
|
* sdio_set_block_size - set the block size of an SDIO function
|
|
* @func: SDIO function to change
|
|
* @blksz: new block size or 0 to use the default.
|
|
*
|
|
* The default block size is the largest supported by both the function
|
|
* and the host, with a maximum of 512 to ensure that arbitrarily sized
|
|
* data transfer use the optimal (least) number of commands.
|
|
*
|
|
* A driver may call this to override the default block size set by the
|
|
* core. This can be used to set a block size greater than the maximum
|
|
* that reported by the card; it is the driver's responsibility to ensure
|
|
* it uses a value that the card supports.
|
|
*
|
|
* Returns 0 on success, -EINVAL if the host does not support the
|
|
* requested block size, or -EIO (etc.) if one of the resultant FBR block
|
|
* size register writes failed.
|
|
*
|
|
*/
|
|
int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
|
|
{
|
|
int ret;
|
|
|
|
if (blksz > func->card->host->max_blk_size)
|
|
return -EINVAL;
|
|
|
|
if (blksz == 0) {
|
|
blksz = min(min(
|
|
func->max_blksize,
|
|
func->card->host->max_blk_size),
|
|
512u);
|
|
}
|
|
|
|
ret = mmc_io_rw_direct(func->card, 1, 0,
|
|
SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
|
|
blksz & 0xff, NULL);
|
|
if (ret)
|
|
return ret;
|
|
ret = mmc_io_rw_direct(func->card, 1, 0,
|
|
SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1,
|
|
(blksz >> 8) & 0xff, NULL);
|
|
if (ret)
|
|
return ret;
|
|
func->cur_blksize = blksz;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sdio_set_block_size);
|
|
|
|
/**
|
|
* sdio_readb - read a single byte from a SDIO function
|
|
* @func: SDIO function to access
|
|
* @addr: address to read
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Reads a single byte from the address space of a given SDIO
|
|
* function. If there is a problem reading the address, 0xff
|
|
* is returned and @err_ret will contain the error code.
|
|
*/
|
|
unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
unsigned char val;
|
|
|
|
BUG_ON(!func);
|
|
|
|
if (err_ret)
|
|
*err_ret = 0;
|
|
|
|
ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
|
|
if (ret) {
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
return 0xFF;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_readb);
|
|
|
|
/**
|
|
* sdio_writeb - write a single byte to a SDIO function
|
|
* @func: SDIO function to access
|
|
* @b: byte to write
|
|
* @addr: address to write to
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Writes a single byte to the address space of a given SDIO
|
|
* function. @err_ret will contain the status of the actual
|
|
* transfer.
|
|
*/
|
|
void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(!func);
|
|
|
|
ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_writeb);
|
|
|
|
/**
|
|
* sdio_memcpy_fromio - read a chunk of memory from a SDIO function
|
|
* @func: SDIO function to access
|
|
* @dst: buffer to store the data
|
|
* @addr: address to begin reading from
|
|
* @count: number of bytes to read
|
|
*
|
|
* Reads up to 512 bytes from the address space of a given SDIO
|
|
* function. Return value indicates if the transfer succeeded or
|
|
* not.
|
|
*/
|
|
int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
|
|
unsigned int addr, int count)
|
|
{
|
|
return mmc_io_rw_extended(func->card, 0, func->num, addr, 0, dst,
|
|
count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
|
|
|
|
/**
|
|
* sdio_memcpy_toio - write a chunk of memory to a SDIO function
|
|
* @func: SDIO function to access
|
|
* @addr: address to start writing to
|
|
* @src: buffer that contains the data to write
|
|
* @count: number of bytes to write
|
|
*
|
|
* Writes up to 512 bytes to the address space of a given SDIO
|
|
* function. Return value indicates if the transfer succeeded or
|
|
* not.
|
|
*/
|
|
int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
|
|
void *src, int count)
|
|
{
|
|
return mmc_io_rw_extended(func->card, 1, func->num, addr, 0, src,
|
|
count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
|
|
|
|
/**
|
|
* sdio_readsb - read from a FIFO on a SDIO function
|
|
* @func: SDIO function to access
|
|
* @dst: buffer to store the data
|
|
* @addr: address of (single byte) FIFO
|
|
* @count: number of bytes to read
|
|
*
|
|
* Reads up to 512 bytes from the specified FIFO of a given SDIO
|
|
* function. Return value indicates if the transfer succeeded or
|
|
* not.
|
|
*/
|
|
int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
|
|
int count)
|
|
{
|
|
return mmc_io_rw_extended(func->card, 0, func->num, addr, 1, dst,
|
|
count);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sdio_readsb);
|
|
|
|
/**
|
|
* sdio_writesb - write to a FIFO of a SDIO function
|
|
* @func: SDIO function to access
|
|
* @addr: address of (single byte) FIFO
|
|
* @src: buffer that contains the data to write
|
|
* @count: number of bytes to write
|
|
*
|
|
* Writes up to 512 bytes to the specified FIFO of a given SDIO
|
|
* function. Return value indicates if the transfer succeeded or
|
|
* not.
|
|
*/
|
|
int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
|
|
int count)
|
|
{
|
|
return mmc_io_rw_extended(func->card, 1, func->num, addr, 1, src,
|
|
count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_writesb);
|
|
|
|
/**
|
|
* sdio_readw - read a 16 bit integer from a SDIO function
|
|
* @func: SDIO function to access
|
|
* @addr: address to read
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Reads a 16 bit integer from the address space of a given SDIO
|
|
* function. If there is a problem reading the address, 0xffff
|
|
* is returned and @err_ret will contain the error code.
|
|
*/
|
|
unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
if (err_ret)
|
|
*err_ret = 0;
|
|
|
|
ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
|
|
if (ret) {
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
return 0xFFFF;
|
|
}
|
|
|
|
return le16_to_cpu(*(u16*)func->tmpbuf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_readw);
|
|
|
|
/**
|
|
* sdio_writew - write a 16 bit integer to a SDIO function
|
|
* @func: SDIO function to access
|
|
* @b: integer to write
|
|
* @addr: address to write to
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Writes a 16 bit integer to the address space of a given SDIO
|
|
* function. @err_ret will contain the status of the actual
|
|
* transfer.
|
|
*/
|
|
void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
*(u16*)func->tmpbuf = cpu_to_le16(b);
|
|
|
|
ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_writew);
|
|
|
|
/**
|
|
* sdio_readl - read a 32 bit integer from a SDIO function
|
|
* @func: SDIO function to access
|
|
* @addr: address to read
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Reads a 32 bit integer from the address space of a given SDIO
|
|
* function. If there is a problem reading the address,
|
|
* 0xffffffff is returned and @err_ret will contain the error
|
|
* code.
|
|
*/
|
|
unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
if (err_ret)
|
|
*err_ret = 0;
|
|
|
|
ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
|
|
if (ret) {
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
return 0xFFFFFFFF;
|
|
}
|
|
|
|
return le32_to_cpu(*(u32*)func->tmpbuf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_readl);
|
|
|
|
/**
|
|
* sdio_writel - write a 32 bit integer to a SDIO function
|
|
* @func: SDIO function to access
|
|
* @b: integer to write
|
|
* @addr: address to write to
|
|
* @err_ret: optional status value from transfer
|
|
*
|
|
* Writes a 32 bit integer to the address space of a given SDIO
|
|
* function. @err_ret will contain the status of the actual
|
|
* transfer.
|
|
*/
|
|
void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
*(u32*)func->tmpbuf = cpu_to_le32(b);
|
|
|
|
ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_writel);
|
|
|