1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Copyright (C) M'boumba Cedric Madianga 2017
6 * Copyright (C) STMicroelectronics 2017
7 * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
14 #include <linux/dma-direction.h>
15 #include <linux/dmaengine.h>
16 #include <linux/dma-mapping.h>
18 enum 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 */
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
36 struct stm32_i2c_dma
{
37 struct dma_chan
*chan_tx
;
38 struct dma_chan
*chan_rx
;
39 struct dma_chan
*chan_using
;
42 enum dma_transfer_direction dma_transfer_dir
;
43 enum dma_data_direction dma_data_dir
;
44 struct completion dma_complete
;
47 struct stm32_i2c_dma
*stm32_i2c_dma_request(struct device
*dev
,
49 u32 txdr_offset
, u32 rxdr_offset
);
51 void stm32_i2c_dma_free(struct stm32_i2c_dma
*dma
);
53 int 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
);
58 #endif /* _I2C_STM32_H */