// SPDX-License-Identifier: GPL-2.0-or-later /* * linux/drivers/mmc/core/sdio_io.c * * Copyright 2007-2008 Pierre Ossman */ #include <linux/export.h> #include <linux/kernel.h> #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" #include "core.h" #include "card.h" #include "host.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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /* * Calculate the maximum byte mode transfer size */ static inline unsigned int sdio_max_byte_size(struct sdio_func *func) { … } /* * This is legacy code, which needs to be re-worked some day. Basically we need * to take into account the properties of the host, as to enable the SDIO func * driver layer to allocate optimal buffers. */ static inline unsigned int _sdio_align_size(unsigned int sz) { … } /** * sdio_align_size - pads a transfer size to a more optimal value * @func: SDIO function * @sz: original transfer size * * Pads the original data size with a number of extra bytes in * order to avoid controller bugs and/or performance hits * (e.g. some controllers revert to PIO for certain sizes). * * If possible, it will also adjust the size so that it can be * handled in just a single request. * * Returns the improved size, which might be unmodified. */ unsigned int sdio_align_size(struct sdio_func *func, unsigned int sz) { … } EXPORT_SYMBOL_GPL(…); /* Split an arbitrarily sized data transfer into several * IO_RW_EXTENDED commands. */ static int sdio_io_rw_ext_helper(struct sdio_func *func, int write, unsigned addr, int incr_addr, u8 *buf, unsigned 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. */ u8 sdio_readb(struct sdio_func *func, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * 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, u8 b, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * sdio_writeb_readb - write and read a byte from SDIO function * @func: SDIO function to access * @write_byte: byte to write * @addr: address to write to * @err_ret: optional status value from transfer * * Performs a RAW (Read after Write) operation as defined by SDIO spec - * single byte is written to address space of a given SDIO function and * response is read back from the same address, both using single request. * If there is a problem with the operation, 0xff is returned and * @err_ret will contain the error code. */ u8 sdio_writeb_readb(struct sdio_func *func, u8 write_byte, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * 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 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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. */ u16 sdio_readw(struct sdio_func *func, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * 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, u16 b, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * 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. */ u32 sdio_readl(struct sdio_func *func, unsigned int addr, int *err_ret) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * sdio_retune_crc_enable - re-enable retuning on CRC errors * @func: SDIO function attached to host * * This is the complement to sdio_retune_crc_disable(). */ void sdio_retune_crc_enable(struct sdio_func *func) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…); /** * 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) { … } EXPORT_SYMBOL_GPL(…);
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