diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-stm32.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-stm32.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-stm32.h b/drivers/i2c/busses/i2c-stm32.h new file mode 100644 index 000000000..2c2189390 --- /dev/null +++ b/drivers/i2c/busses/i2c-stm32.h @@ -0,0 +1,58 @@ +/* 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 */ |