LXR linux/drivers/i2c/busses/i2c-stm32.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * i2c-stm32.h
   4 *
   5 * Copyright (C) M'boumba Cedric Madianga 2017
   6 * Copyright (C) STMicroelectronics 2017
   7 * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
   8 *
   9 */
  10
  11#ifndef _I2C_STM32_H
  12#define _I2C_STM32_H
  13
  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 data
  27 * @chan_tx: dma channel for TX transfer
  28 * @chan_rx: dma channel for RX transfer
  29 * @chan_using: dma channel used for the current transfer (TX or RX)
  30 * @dma_buf: dma buffer
  31 * @dma_len: dma buffer len
  32 * @dma_transfer_dir: dma transfer direction indicator
  33 * @dma_data_dir: dma transfer mode indicator
  34 * @dma_complete: dma transfer completion
  35 */
  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