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 | |
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 */ |
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 | */ |
36 | struct 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 | |
47 | struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev, |
48 | dma_addr_t phy_addr, |
49 | u32 txdr_offset, u32 rxdr_offset); |
50 | |
51 | void stm32_i2c_dma_free(struct stm32_i2c_dma *dma); |
52 | |
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); |
57 | |
58 | #endif /* _I2C_STM32_H */ |
59 | |