7806cdb40f
Add sdio_f0_readb() and sdio_f0_writeb() functions to reading and writing function 0 registers. Writes outside the vendor specific CCCR registers (0xF0 - 0xFF) are not permitted. Signed-off-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
548 lines
13 KiB
C
548 lines
13 KiB
C
/*
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* linux/drivers/mmc/core/sdio_io.c
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*
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* Copyright 2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/sdio.h>
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#include <linux/mmc/sdio_func.h>
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#include "sdio_ops.h"
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/**
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* sdio_claim_host - exclusively claim a bus for a certain SDIO function
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* @func: SDIO function that will be accessed
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*
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* Claim a bus for a set of operations. The SDIO function given
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* is used to figure out which bus is relevant.
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*/
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void sdio_claim_host(struct sdio_func *func)
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{
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BUG_ON(!func);
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BUG_ON(!func->card);
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mmc_claim_host(func->card->host);
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}
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EXPORT_SYMBOL_GPL(sdio_claim_host);
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/**
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* sdio_release_host - release a bus for a certain SDIO function
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* @func: SDIO function that was accessed
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*
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* Release a bus, allowing others to claim the bus for their
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* operations.
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*/
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void sdio_release_host(struct sdio_func *func)
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{
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BUG_ON(!func);
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BUG_ON(!func->card);
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mmc_release_host(func->card->host);
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}
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EXPORT_SYMBOL_GPL(sdio_release_host);
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/**
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* sdio_enable_func - enables a SDIO function for usage
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* @func: SDIO function to enable
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*
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* Powers up and activates a SDIO function so that register
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* access is possible.
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*/
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int sdio_enable_func(struct sdio_func *func)
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{
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int ret;
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unsigned char reg;
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unsigned long timeout;
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BUG_ON(!func);
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BUG_ON(!func->card);
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pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
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ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
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if (ret)
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goto err;
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reg |= 1 << func->num;
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ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
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if (ret)
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goto err;
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/*
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* FIXME: This should timeout based on information in the CIS,
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* but we don't have card to parse that yet.
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*/
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timeout = jiffies + HZ;
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while (1) {
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ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, ®);
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if (ret)
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goto err;
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if (reg & (1 << func->num))
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break;
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ret = -ETIME;
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if (time_after(jiffies, timeout))
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goto err;
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}
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pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
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return 0;
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err:
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pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
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return ret;
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}
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EXPORT_SYMBOL_GPL(sdio_enable_func);
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/**
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* sdio_disable_func - disable a SDIO function
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* @func: SDIO function to disable
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*
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* Powers down and deactivates a SDIO function. Register access
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* to this function will fail until the function is reenabled.
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*/
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int sdio_disable_func(struct sdio_func *func)
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{
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int ret;
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unsigned char reg;
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BUG_ON(!func);
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BUG_ON(!func->card);
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pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
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ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, ®);
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if (ret)
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goto err;
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reg &= ~(1 << func->num);
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ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
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if (ret)
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goto err;
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pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
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return 0;
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err:
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pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
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return -EIO;
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}
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EXPORT_SYMBOL_GPL(sdio_disable_func);
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/**
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* sdio_set_block_size - set the block size of an SDIO function
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* @func: SDIO function to change
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* @blksz: new block size or 0 to use the default.
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*
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* The default block size is the largest supported by both the function
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* and the host, with a maximum of 512 to ensure that arbitrarily sized
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* data transfer use the optimal (least) number of commands.
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*
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* A driver may call this to override the default block size set by the
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* core. This can be used to set a block size greater than the maximum
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* that reported by the card; it is the driver's responsibility to ensure
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* it uses a value that the card supports.
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*
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* Returns 0 on success, -EINVAL if the host does not support the
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* requested block size, or -EIO (etc.) if one of the resultant FBR block
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* size register writes failed.
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*
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*/
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int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
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{
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int ret;
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if (blksz > func->card->host->max_blk_size)
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return -EINVAL;
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if (blksz == 0) {
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blksz = min(min(
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func->max_blksize,
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func->card->host->max_blk_size),
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512u);
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}
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ret = mmc_io_rw_direct(func->card, 1, 0,
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SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
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blksz & 0xff, NULL);
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if (ret)
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return ret;
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ret = mmc_io_rw_direct(func->card, 1, 0,
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SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1,
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(blksz >> 8) & 0xff, NULL);
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if (ret)
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return ret;
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func->cur_blksize = blksz;
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return 0;
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}
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EXPORT_SYMBOL_GPL(sdio_set_block_size);
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/* Split an arbitrarily sized data transfer into several
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* IO_RW_EXTENDED commands. */
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static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
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unsigned addr, int incr_addr, u8 *buf, unsigned size)
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{
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unsigned remainder = size;
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unsigned max_blocks;
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int ret;
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/* Do the bulk of the transfer using block mode (if supported). */
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if (func->card->cccr.multi_block) {
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/* Blocks per command is limited by host count, host transfer
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* size (we only use a single sg entry) and the maximum for
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* IO_RW_EXTENDED of 511 blocks. */
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max_blocks = min(min(
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func->card->host->max_blk_count,
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func->card->host->max_seg_size / func->cur_blksize),
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511u);
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while (remainder > func->cur_blksize) {
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unsigned blocks;
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blocks = remainder / func->cur_blksize;
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if (blocks > max_blocks)
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blocks = max_blocks;
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size = blocks * func->cur_blksize;
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ret = mmc_io_rw_extended(func->card, write,
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func->num, addr, incr_addr, buf,
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blocks, func->cur_blksize);
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if (ret)
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return ret;
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remainder -= size;
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buf += size;
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if (incr_addr)
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addr += size;
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}
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}
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/* Write the remainder using byte mode. */
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while (remainder > 0) {
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size = remainder;
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if (size > func->cur_blksize)
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size = func->cur_blksize;
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if (size > 512)
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size = 512; /* maximum size for byte mode */
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ret = mmc_io_rw_extended(func->card, write, func->num, addr,
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incr_addr, buf, 1, size);
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if (ret)
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return ret;
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remainder -= size;
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buf += size;
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if (incr_addr)
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addr += size;
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}
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return 0;
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}
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/**
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* sdio_readb - read a single byte from a SDIO function
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* @func: SDIO function to access
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* @addr: address to read
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* @err_ret: optional status value from transfer
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*
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* Reads a single byte from the address space of a given SDIO
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* function. If there is a problem reading the address, 0xff
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* is returned and @err_ret will contain the error code.
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*/
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unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
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int *err_ret)
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{
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int ret;
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unsigned char val;
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BUG_ON(!func);
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if (err_ret)
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*err_ret = 0;
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ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
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if (ret) {
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if (err_ret)
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*err_ret = ret;
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return 0xFF;
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}
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return val;
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}
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EXPORT_SYMBOL_GPL(sdio_readb);
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/**
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* sdio_writeb - write a single byte to a SDIO function
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* @func: SDIO function to access
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* @b: byte to write
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* @addr: address to write to
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* @err_ret: optional status value from transfer
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*
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* Writes a single byte to the address space of a given SDIO
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* function. @err_ret will contain the status of the actual
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* transfer.
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*/
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void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
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int *err_ret)
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{
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int ret;
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BUG_ON(!func);
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ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
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if (err_ret)
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*err_ret = ret;
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}
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EXPORT_SYMBOL_GPL(sdio_writeb);
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/**
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* sdio_memcpy_fromio - read a chunk of memory from a SDIO function
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* @func: SDIO function to access
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* @dst: buffer to store the data
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* @addr: address to begin reading from
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* @count: number of bytes to read
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*
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* Reads from the address space of a given SDIO function. Return
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* value indicates if the transfer succeeded or not.
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*/
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int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
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unsigned int addr, int count)
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{
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return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
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}
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EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
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/**
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* sdio_memcpy_toio - write a chunk of memory to a SDIO function
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* @func: SDIO function to access
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* @addr: address to start writing to
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* @src: buffer that contains the data to write
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* @count: number of bytes to write
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*
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* Writes to the address space of a given SDIO function. Return
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* value indicates if the transfer succeeded or not.
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*/
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int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
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void *src, int count)
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{
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return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
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}
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EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
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/**
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* sdio_readsb - read from a FIFO on a SDIO function
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* @func: SDIO function to access
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* @dst: buffer to store the data
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* @addr: address of (single byte) FIFO
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* @count: number of bytes to read
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*
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* Reads from the specified FIFO of a given SDIO function. Return
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* value indicates if the transfer succeeded or not.
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*/
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int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
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int count)
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{
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return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
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}
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EXPORT_SYMBOL_GPL(sdio_readsb);
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/**
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* sdio_writesb - write to a FIFO of a SDIO function
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* @func: SDIO function to access
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* @addr: address of (single byte) FIFO
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* @src: buffer that contains the data to write
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* @count: number of bytes to write
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*
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* Writes to the specified FIFO of a given SDIO function. Return
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* value indicates if the transfer succeeded or not.
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*/
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int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
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int count)
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{
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return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
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}
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EXPORT_SYMBOL_GPL(sdio_writesb);
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/**
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* sdio_readw - read a 16 bit integer from a SDIO function
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* @func: SDIO function to access
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* @addr: address to read
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* @err_ret: optional status value from transfer
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*
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* Reads a 16 bit integer from the address space of a given SDIO
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* function. If there is a problem reading the address, 0xffff
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* is returned and @err_ret will contain the error code.
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*/
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unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
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int *err_ret)
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{
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int ret;
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if (err_ret)
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*err_ret = 0;
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ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
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if (ret) {
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if (err_ret)
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*err_ret = ret;
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return 0xFFFF;
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}
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return le16_to_cpu(*(u16*)func->tmpbuf);
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}
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EXPORT_SYMBOL_GPL(sdio_readw);
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/**
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* sdio_writew - write a 16 bit integer to a SDIO function
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* @func: SDIO function to access
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* @b: integer to write
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* @addr: address to write to
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* @err_ret: optional status value from transfer
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*
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* Writes a 16 bit integer to the address space of a given SDIO
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* function. @err_ret will contain the status of the actual
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* transfer.
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*/
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void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
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int *err_ret)
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{
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int ret;
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*(u16*)func->tmpbuf = cpu_to_le16(b);
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ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
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if (err_ret)
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*err_ret = ret;
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}
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EXPORT_SYMBOL_GPL(sdio_writew);
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/**
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* sdio_readl - read a 32 bit integer from a SDIO function
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* @func: SDIO function to access
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* @addr: address to read
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* @err_ret: optional status value from transfer
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*
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* Reads a 32 bit integer from the address space of a given SDIO
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* function. If there is a problem reading the address,
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* 0xffffffff is returned and @err_ret will contain the error
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* code.
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*/
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unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
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int *err_ret)
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{
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int ret;
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if (err_ret)
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*err_ret = 0;
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ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
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if (ret) {
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if (err_ret)
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*err_ret = ret;
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return 0xFFFFFFFF;
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}
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return le32_to_cpu(*(u32*)func->tmpbuf);
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}
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EXPORT_SYMBOL_GPL(sdio_readl);
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/**
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* sdio_writel - write a 32 bit integer to a SDIO function
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* @func: SDIO function to access
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* @b: integer to write
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* @addr: address to write to
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* @err_ret: optional status value from transfer
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*
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* Writes a 32 bit integer to the address space of a given SDIO
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* function. @err_ret will contain the status of the actual
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* transfer.
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*/
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void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
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int *err_ret)
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{
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int ret;
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*(u32*)func->tmpbuf = cpu_to_le32(b);
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ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
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if (err_ret)
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*err_ret = ret;
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}
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EXPORT_SYMBOL_GPL(sdio_writel);
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/**
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* sdio_f0_readb - read a single byte from SDIO function 0
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* @func: an SDIO function of the card
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* @addr: address to read
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* @err_ret: optional status value from transfer
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*
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* Reads a single byte from the address space of SDIO function 0.
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* If there is a problem reading the address, 0xff is returned
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* and @err_ret will contain the error code.
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*/
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unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
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int *err_ret)
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{
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int ret;
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unsigned char val;
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BUG_ON(!func);
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if (err_ret)
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*err_ret = 0;
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ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
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if (ret) {
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if (err_ret)
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*err_ret = ret;
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return 0xFF;
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}
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return val;
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}
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EXPORT_SYMBOL_GPL(sdio_f0_readb);
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/**
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* sdio_f0_writeb - write a single byte to SDIO function 0
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* @func: an SDIO function of the card
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* @b: byte to write
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* @addr: address to write to
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* @err_ret: optional status value from transfer
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*
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* Writes a single byte to the address space of SDIO function 0.
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* @err_ret will contain the status of the actual transfer.
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*
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* Only writes to the vendor specific CCCR registers (0xF0 -
|
|
* 0xFF) are permiited; @err_ret will be set to -EINVAL for *
|
|
* writes outside this range.
|
|
*/
|
|
void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
|
|
int *err_ret)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(!func);
|
|
|
|
if (addr < 0xF0 || addr > 0xFF) {
|
|
if (err_ret)
|
|
*err_ret = -EINVAL;
|
|
return;
|
|
}
|
|
|
|
ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
|
|
if (err_ret)
|
|
*err_ret = ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_f0_writeb);
|