| // 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 */ |