/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_ARCH_DMA_H #define __ASM_ARCH_DMA_H #include <linux/types.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> /* * M2P channels. * * Note that these values are also directly used for setting the PPALLOC * register. */ #define EP93XX_DMA_I2S1 … #define EP93XX_DMA_I2S2 … #define EP93XX_DMA_AAC1 … #define EP93XX_DMA_AAC2 … #define EP93XX_DMA_AAC3 … #define EP93XX_DMA_I2S3 … #define EP93XX_DMA_UART1 … #define EP93XX_DMA_UART2 … #define EP93XX_DMA_UART3 … #define EP93XX_DMA_IRDA … /* M2M channels */ #define EP93XX_DMA_SSP … #define EP93XX_DMA_IDE … /** * struct ep93xx_dma_data - configuration data for the EP93xx dmaengine * @port: peripheral which is requesting the channel * @direction: TX/RX channel * @name: optional name for the channel, this is displayed in /proc/interrupts * * This information is passed as private channel parameter in a filter * function. Note that this is only needed for slave/cyclic channels. For * memcpy channels %NULL data should be passed. */ struct ep93xx_dma_data { … }; /** * struct ep93xx_dma_chan_data - platform specific data for a DMA channel * @name: name of the channel, used for getting the right clock for the channel * @base: mapped registers * @irq: interrupt number used by this channel */ struct ep93xx_dma_chan_data { … }; /** * struct ep93xx_dma_platform_data - platform data for the dmaengine driver * @channels: array of channels which are passed to the driver * @num_channels: number of channels in the array * * This structure is passed to the DMA engine driver via platform data. For * M2P channels, contract is that even channels are for TX and odd for RX. * There is no requirement for the M2M channels. */ struct ep93xx_dma_platform_data { … }; static inline bool ep93xx_dma_chan_is_m2p(struct dma_chan *chan) { … } /** * ep93xx_dma_chan_direction - returns direction the channel can be used * @chan: channel * * This function can be used in filter functions to find out whether the * channel supports given DMA direction. Only M2P channels have such * limitation, for M2M channels the direction is configurable. */ static inline enum dma_transfer_direction ep93xx_dma_chan_direction(struct dma_chan *chan) { … } #endif /* __ASM_ARCH_DMA_H */
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