Edit File: dma-ep93xx.h
#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 0 #define EP93XX_DMA_I2S2 1 #define EP93XX_DMA_AAC1 2 #define EP93XX_DMA_AAC2 3 #define EP93XX_DMA_AAC3 4 #define EP93XX_DMA_I2S3 5 #define EP93XX_DMA_UART1 6 #define EP93XX_DMA_UART2 7 #define EP93XX_DMA_UART3 8 #define EP93XX_DMA_IRDA 9 /* M2M channels */ #define EP93XX_DMA_SSP 10 #define EP93XX_DMA_IDE 11 /** * 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 { int port; enum dma_transfer_direction direction; const char *name; }; /** * 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 { const char *name; void __iomem *base; int irq; }; /** * 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 { struct ep93xx_dma_chan_data *channels; size_t num_channels; }; static inline bool ep93xx_dma_chan_is_m2p(struct dma_chan *chan) { return !strcmp(dev_name(chan->device->dev), "ep93xx-dma-m2p"); } /** * 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) { if (!ep93xx_dma_chan_is_m2p(chan)) return DMA_NONE; /* even channels are for TX, odd for RX */ return (chan->chan_id % 2 == 0) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; } #endif /* __ASM_ARCH_DMA_H */