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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * i2c-stm32.h4 *5 * Copyright (C) M'boumba Cedric Madianga 20176 * Copyright (C) STMicroelectronics 20177 * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>8 *9 */10 11#ifndef _I2C_STM32_H12#define _I2C_STM32_H13 14#include <linux/dma-direction.h>15#include <linux/dmaengine.h>16#include <linux/dma-mapping.h>17 18enum stm32_i2c_speed {19 STM32_I2C_SPEED_STANDARD, /* 100 kHz */20 STM32_I2C_SPEED_FAST, /* 400 kHz */21 STM32_I2C_SPEED_FAST_PLUS, /* 1 MHz */22 STM32_I2C_SPEED_END,23};24 25/**26 * struct stm32_i2c_dma - DMA specific data27 * @chan_tx: dma channel for TX transfer28 * @chan_rx: dma channel for RX transfer29 * @chan_using: dma channel used for the current transfer (TX or RX)30 * @dma_buf: dma buffer31 * @dma_len: dma buffer len32 * @dma_transfer_dir: dma transfer direction indicator33 * @dma_data_dir: dma transfer mode indicator34 * @dma_complete: dma transfer completion35 */36struct stm32_i2c_dma {37 struct dma_chan *chan_tx;38 struct dma_chan *chan_rx;39 struct dma_chan *chan_using;40 dma_addr_t dma_buf;41 unsigned int dma_len;42 enum dma_transfer_direction dma_transfer_dir;43 enum dma_data_direction dma_data_dir;44 struct completion dma_complete;45};46 47struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,48 dma_addr_t phy_addr,49 u32 txdr_offset, u32 rxdr_offset);50 51void stm32_i2c_dma_free(struct stm32_i2c_dma *dma);52 53int stm32_i2c_prep_dma_xfer(struct device *dev, struct stm32_i2c_dma *dma,54 bool rd_wr, u32 len, u8 *buf,55 dma_async_tx_callback callback,56 void *dma_async_param);57 58#endif /* _I2C_STM32_H */59