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90865a3d | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | /* |
3 | * i2c-stm32.h | |
4 | * | |
5 | * Copyright (C) M'boumba Cedric Madianga 2017 | |
9c41e452 | 6 | * Copyright (C) STMicroelectronics 2017 |
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7 | * Author: M'boumba Cedric Madianga <cedric.madianga@gmail.com> |
8 | * | |
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9 | */ |
10 | ||
11 | #ifndef _I2C_STM32_H | |
12 | #define _I2C_STM32_H | |
13 | ||
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14 | #include <linux/dma-direction.h> |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | ||
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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 | ||
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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 | ||
df8c847b | 58 | #endif /* _I2C_STM32_H */ |