/* * Maximum size for a single dma descriptor * Size is limited to 16 bits. * Size is in the units of addr-widths (1,2,4,8 bytes) * Larger transfers will be split up to multiple linked desc
*/ #define STEDMA40_MAX_SEG_SIZE 0xFFFF
/* dev types for memcpy */ #define STEDMA40_DEV_DST_MEMORY (-1) #define STEDMA40_DEV_SRC_MEMORY (-1)
/* The value 4 indicates that PEN-reg shall be set to 0 */ #define STEDMA40_PSIZE_PHY_1 0x4 #define STEDMA40_PSIZE_PHY_2 0x0 #define STEDMA40_PSIZE_PHY_4 0x1 #define STEDMA40_PSIZE_PHY_8 0x2 #define STEDMA40_PSIZE_PHY_16 0x3
/* * The number of elements differ in logical and * physical mode
*/ #define STEDMA40_PSIZE_LOG_1 STEDMA40_PSIZE_PHY_2 #define STEDMA40_PSIZE_LOG_4 STEDMA40_PSIZE_PHY_4 #define STEDMA40_PSIZE_LOG_8 STEDMA40_PSIZE_PHY_8 #define STEDMA40_PSIZE_LOG_16 STEDMA40_PSIZE_PHY_16
/* Maximum number of possible physical channels */ #define STEDMA40_MAX_PHYS 32
/** * struct stedma40_half_channel_info - dst/src channel configuration * * @big_endian: true if the src/dst should be read as big endian * @data_width: Data width of the src/dst hardware * @p_size: Burst size * @flow_ctrl: Flow control on/off.
*/ struct stedma40_half_channel_info { bool big_endian; enum dma_slave_buswidth data_width; int psize; enum stedma40_flow_ctrl flow_ctrl;
};
/** * struct stedma40_chan_cfg - Structure to be filled by client drivers. * * @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH * @high_priority: true if high-priority * @realtime: true if realtime mode is to be enabled. Only available on DMA40 * version 3+, i.e DB8500v2+ * @mode: channel mode: physical, logical, or operation * @mode_opt: options for the chosen channel mode * @dev_type: src/dst device type (driver uses dir to figure out which) * @src_info: Parameters for dst half channel * @dst_info: Parameters for dst half channel * @use_fixed_channel: if true, use physical channel specified by phy_channel * @phy_channel: physical channel to use, only if use_fixed_channel is true * * This structure has to be filled by the client drivers. * It is recommended to do all dma configurations for clients in the machine. *
*/ struct stedma40_chan_cfg { enum dma_transfer_direction dir; bool high_priority; bool realtime; enum stedma40_mode mode; enum stedma40_mode_opt mode_opt; int dev_type; struct stedma40_half_channel_info src_info; struct stedma40_half_channel_info dst_info;
bool use_fixed_channel; int phy_channel;
};
#endif/* STE_DMA40_H */
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