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814 lines
21 KiB
814 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* linux/drivers/mmc/core/sdio_io.c |
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* |
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* Copyright 2007-2008 Pierre Ossman |
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*/ |
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|
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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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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|
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#include "sdio_ops.h" |
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#include "core.h" |
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#include "card.h" |
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#include "host.h" |
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|
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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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if (WARN_ON(!func)) |
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return; |
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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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if (WARN_ON(!func)) |
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return; |
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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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if (!func) |
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return -EINVAL; |
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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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timeout = jiffies + msecs_to_jiffies(func->enable_timeout); |
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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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if (!func) |
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return -EINVAL; |
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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 ret; |
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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(func->max_blksize, func->card->host->max_blk_size); |
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blksz = min(blksz, 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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/* |
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* Calculate the maximum byte mode transfer size |
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*/ |
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static inline unsigned int sdio_max_byte_size(struct sdio_func *func) |
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{ |
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unsigned mval = func->card->host->max_blk_size; |
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if (mmc_blksz_for_byte_mode(func->card)) |
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mval = min(mval, func->cur_blksize); |
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else |
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mval = min(mval, func->max_blksize); |
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if (mmc_card_broken_byte_mode_512(func->card)) |
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return min(mval, 511u); |
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return min(mval, 512u); /* maximum size for byte mode */ |
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} |
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/* |
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* This is legacy code, which needs to be re-worked some day. Basically we need |
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* to take into account the properties of the host, as to enable the SDIO func |
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* driver layer to allocate optimal buffers. |
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*/ |
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static inline unsigned int _sdio_align_size(unsigned int sz) |
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{ |
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/* |
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* FIXME: We don't have a system for the controller to tell |
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* the core about its problems yet, so for now we just 32-bit |
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* align the size. |
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*/ |
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return ALIGN(sz, 4); |
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} |
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/** |
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* sdio_align_size - pads a transfer size to a more optimal value |
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* @func: SDIO function |
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* @sz: original transfer size |
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* |
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* Pads the original data size with a number of extra bytes in |
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* order to avoid controller bugs and/or performance hits |
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* (e.g. some controllers revert to PIO for certain sizes). |
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* |
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* If possible, it will also adjust the size so that it can be |
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* handled in just a single request. |
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* |
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* Returns the improved size, which might be unmodified. |
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*/ |
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unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) |
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{ |
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unsigned int orig_sz; |
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unsigned int blk_sz, byte_sz; |
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unsigned chunk_sz; |
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orig_sz = sz; |
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/* |
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* Do a first check with the controller, in case it |
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* wants to increase the size up to a point where it |
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* might need more than one block. |
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*/ |
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sz = _sdio_align_size(sz); |
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/* |
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* If we can still do this with just a byte transfer, then |
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* we're done. |
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*/ |
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if (sz <= sdio_max_byte_size(func)) |
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return sz; |
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if (func->card->cccr.multi_block) { |
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/* |
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* Check if the transfer is already block aligned |
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*/ |
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if ((sz % func->cur_blksize) == 0) |
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return sz; |
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/* |
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* Realign it so that it can be done with one request, |
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* and recheck if the controller still likes it. |
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*/ |
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blk_sz = ((sz + func->cur_blksize - 1) / |
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func->cur_blksize) * func->cur_blksize; |
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blk_sz = _sdio_align_size(blk_sz); |
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/* |
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* This value is only good if it is still just |
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* one request. |
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*/ |
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if ((blk_sz % func->cur_blksize) == 0) |
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return blk_sz; |
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/* |
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* We failed to do one request, but at least try to |
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* pad the remainder properly. |
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*/ |
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byte_sz = _sdio_align_size(sz % func->cur_blksize); |
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if (byte_sz <= sdio_max_byte_size(func)) { |
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blk_sz = sz / func->cur_blksize; |
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return blk_sz * func->cur_blksize + byte_sz; |
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} |
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} else { |
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/* |
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* We need multiple requests, so first check that the |
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* controller can handle the chunk size; |
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*/ |
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chunk_sz = _sdio_align_size(sdio_max_byte_size(func)); |
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if (chunk_sz == sdio_max_byte_size(func)) { |
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/* |
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* Fix up the size of the remainder (if any) |
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*/ |
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byte_sz = orig_sz % chunk_sz; |
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if (byte_sz) { |
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byte_sz = _sdio_align_size(byte_sz); |
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} |
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return (orig_sz / chunk_sz) * chunk_sz + byte_sz; |
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} |
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} |
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/* |
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* The controller is simply incapable of transferring the size |
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* we want in decent manner, so just return the original size. |
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*/ |
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return orig_sz; |
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} |
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EXPORT_SYMBOL_GPL(sdio_align_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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if (!func || (func->num > 7)) |
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return -EINVAL; |
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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 && (size > sdio_max_byte_size(func))) { |
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/* Blocks per command is limited by host count, host transfer |
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* size and the maximum for IO_RW_EXTENDED of 511 blocks. */ |
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max_blocks = min(func->card->host->max_blk_count, 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 = min(remainder, sdio_max_byte_size(func)); |
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/* Indicate byte mode by setting "blocks" = 0 */ |
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ret = mmc_io_rw_extended(func->card, write, func->num, addr, |
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incr_addr, buf, 0, 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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u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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u8 val; |
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if (!func) { |
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if (err_ret) |
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*err_ret = -EINVAL; |
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return 0xFF; |
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} |
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ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val); |
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if (err_ret) |
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*err_ret = ret; |
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if (ret) |
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return 0xFF; |
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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, u8 b, unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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if (!func) { |
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if (err_ret) |
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*err_ret = -EINVAL; |
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return; |
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} |
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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_writeb_readb - write and read a byte from SDIO function |
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* @func: SDIO function to access |
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* @write_byte: 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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* Performs a RAW (Read after Write) operation as defined by SDIO spec - |
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* single byte is written to address space of a given SDIO function and |
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* response is read back from the same address, both using single request. |
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* If there is a problem with the operation, 0xff is returned and |
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* @err_ret will contain the error code. |
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*/ |
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u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, |
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unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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u8 val; |
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ret = mmc_io_rw_direct(func->card, 1, func->num, addr, |
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write_byte, &val); |
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if (err_ret) |
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*err_ret = ret; |
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if (ret) |
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return 0xff; |
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return val; |
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} |
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EXPORT_SYMBOL_GPL(sdio_writeb_readb); |
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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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/** |
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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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/** |
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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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/** |
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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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u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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|
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ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2); |
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if (err_ret) |
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*err_ret = ret; |
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if (ret) |
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return 0xFFFF; |
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return le16_to_cpup((__le16 *)func->tmpbuf); |
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} |
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EXPORT_SYMBOL_GPL(sdio_readw); |
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|
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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, u16 b, unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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|
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*(__le16 *)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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/** |
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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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u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) |
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{ |
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int ret; |
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|
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ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4); |
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if (err_ret) |
|
*err_ret = ret; |
|
if (ret) |
|
return 0xFFFFFFFF; |
|
|
|
return le32_to_cpup((__le32 *)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, u32 b, unsigned int addr, int *err_ret) |
|
{ |
|
int ret; |
|
|
|
*(__le32 *)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); |
|
|
|
/** |
|
* sdio_f0_readb - read a single byte from SDIO function 0 |
|
* @func: an SDIO function of the card |
|
* @addr: address to read |
|
* @err_ret: optional status value from transfer |
|
* |
|
* Reads a single byte from the address space of SDIO function 0. |
|
* If there is a problem reading the address, 0xff is returned |
|
* and @err_ret will contain the error code. |
|
*/ |
|
unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr, |
|
int *err_ret) |
|
{ |
|
int ret; |
|
unsigned char val; |
|
|
|
if (!func) { |
|
if (err_ret) |
|
*err_ret = -EINVAL; |
|
return 0xFF; |
|
} |
|
|
|
ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val); |
|
if (err_ret) |
|
*err_ret = ret; |
|
if (ret) |
|
return 0xFF; |
|
|
|
return val; |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_f0_readb); |
|
|
|
/** |
|
* sdio_f0_writeb - write a single byte to SDIO function 0 |
|
* @func: an SDIO function of the card |
|
* @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 SDIO function 0. |
|
* @err_ret will contain the status of the actual transfer. |
|
* |
|
* 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; |
|
|
|
if (!func) { |
|
if (err_ret) |
|
*err_ret = -EINVAL; |
|
return; |
|
} |
|
|
|
if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) { |
|
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); |
|
|
|
/** |
|
* sdio_get_host_pm_caps - get host power management capabilities |
|
* @func: SDIO function attached to host |
|
* |
|
* Returns a capability bitmask corresponding to power management |
|
* features supported by the host controller that the card function |
|
* might rely upon during a system suspend. The host doesn't need |
|
* to be claimed, nor the function active, for this information to be |
|
* obtained. |
|
*/ |
|
mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func) |
|
{ |
|
if (!func) |
|
return 0; |
|
|
|
return func->card->host->pm_caps; |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_get_host_pm_caps); |
|
|
|
/** |
|
* sdio_set_host_pm_flags - set wanted host power management capabilities |
|
* @func: SDIO function attached to host |
|
* @flags: Power Management flags to set |
|
* |
|
* Set a capability bitmask corresponding to wanted host controller |
|
* power management features for the upcoming suspend state. |
|
* This must be called, if needed, each time the suspend method of |
|
* the function driver is called, and must contain only bits that |
|
* were returned by sdio_get_host_pm_caps(). |
|
* The host doesn't need to be claimed, nor the function active, |
|
* for this information to be set. |
|
*/ |
|
int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) |
|
{ |
|
struct mmc_host *host; |
|
|
|
if (!func) |
|
return -EINVAL; |
|
|
|
host = func->card->host; |
|
|
|
if (flags & ~host->pm_caps) |
|
return -EINVAL; |
|
|
|
/* function suspend methods are serialized, hence no lock needed */ |
|
host->pm_flags |= flags; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); |
|
|
|
/** |
|
* sdio_retune_crc_disable - temporarily disable retuning on CRC errors |
|
* @func: SDIO function attached to host |
|
* |
|
* If the SDIO card is known to be in a state where it might produce |
|
* CRC errors on the bus in response to commands (like if we know it is |
|
* transitioning between power states), an SDIO function driver can |
|
* call this function to temporarily disable the SD/MMC core behavior of |
|
* triggering an automatic retuning. |
|
* |
|
* This function should be called while the host is claimed and the host |
|
* should remain claimed until sdio_retune_crc_enable() is called. |
|
* Specifically, the expected sequence of calls is: |
|
* - sdio_claim_host() |
|
* - sdio_retune_crc_disable() |
|
* - some number of calls like sdio_writeb() and sdio_readb() |
|
* - sdio_retune_crc_enable() |
|
* - sdio_release_host() |
|
*/ |
|
void sdio_retune_crc_disable(struct sdio_func *func) |
|
{ |
|
func->card->host->retune_crc_disable = true; |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_retune_crc_disable); |
|
|
|
/** |
|
* sdio_retune_crc_enable - re-enable retuning on CRC errors |
|
* @func: SDIO function attached to host |
|
* |
|
* This is the compement to sdio_retune_crc_disable(). |
|
*/ |
|
void sdio_retune_crc_enable(struct sdio_func *func) |
|
{ |
|
func->card->host->retune_crc_disable = false; |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_retune_crc_enable); |
|
|
|
/** |
|
* sdio_retune_hold_now - start deferring retuning requests till release |
|
* @func: SDIO function attached to host |
|
* |
|
* This function can be called if it's currently a bad time to do |
|
* a retune of the SDIO card. Retune requests made during this time |
|
* will be held and we'll actually do the retune sometime after the |
|
* release. |
|
* |
|
* This function could be useful if an SDIO card is in a power state |
|
* where it can respond to a small subset of commands that doesn't |
|
* include the retuning command. Care should be taken when using |
|
* this function since (presumably) the retuning request we might be |
|
* deferring was made for a good reason. |
|
* |
|
* This function should be called while the host is claimed. |
|
*/ |
|
void sdio_retune_hold_now(struct sdio_func *func) |
|
{ |
|
mmc_retune_hold_now(func->card->host); |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_retune_hold_now); |
|
|
|
/** |
|
* sdio_retune_release - signal that it's OK to retune now |
|
* @func: SDIO function attached to host |
|
* |
|
* This is the complement to sdio_retune_hold_now(). Calling this |
|
* function won't make a retune happen right away but will allow |
|
* them to be scheduled normally. |
|
* |
|
* This function should be called while the host is claimed. |
|
*/ |
|
void sdio_retune_release(struct sdio_func *func) |
|
{ |
|
mmc_retune_release(func->card->host); |
|
} |
|
EXPORT_SYMBOL_GPL(sdio_retune_release);
|
|
|