diff options
Diffstat (limited to 'include/linux/platform_data/dma-ep93xx.h')
| -rw-r--r-- | include/linux/platform_data/dma-ep93xx.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/include/linux/platform_data/dma-ep93xx.h b/include/linux/platform_data/dma-ep93xx.h new file mode 100644 index 0000000..e82c642 --- /dev/null +++ b/include/linux/platform_data/dma-ep93xx.h @@ -0,0 +1,93 @@ +#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 */ |
