/* SPDX-License-Identifier: GPL-2.0 */ /* * i2c-stm32.h * * Copyright (C) M'boumba Cedric Madianga 2017 * Copyright (C) STMicroelectronics 2017 * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com> * */ #ifndef _I2C_STM32_H #define _I2C_STM32_H #include <linux/dma-direction.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> enum stm32_i2c_speed { STM32_I2C_SPEED_STANDARD, /* 100 kHz */ STM32_I2C_SPEED_FAST, /* 400 kHz */ STM32_I2C_SPEED_FAST_PLUS, /* 1 MHz */ STM32_I2C_SPEED_END, }; /** * struct stm32_i2c_dma - DMA specific data * @chan_tx: dma channel for TX transfer * @chan_rx: dma channel for RX transfer * @chan_using: dma channel used for the current transfer (TX or RX) * @dma_buf: dma buffer * @dma_len: dma buffer len * @dma_transfer_dir: dma transfer direction indicator * @dma_data_dir: dma transfer mode indicator * @dma_complete: dma transfer completion */ struct stm32_i2c_dma { struct dma_chan *chan_tx; struct dma_chan *chan_rx; struct dma_chan *chan_using; dma_addr_t dma_buf; unsigned int dma_len; enum dma_transfer_direction dma_transfer_dir; enum dma_data_direction dma_data_dir; struct completion dma_complete; }; struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev, dma_addr_t phy_addr, u32 txdr_offset, u32 rxdr_offset); void stm32_i2c_dma_free(struct stm32_i2c_dma *dma); int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma, bool rd_wr, u32 len, u8 *buf, dma_async_tx_callback callback, void *dma_async_param); #endif /* _I2C_STM32_H */