1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * S3C24XX DMA handling 4 * 5 * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> 6 */ 7 8 /* Helper to encode the source selection constraints for early s3c socs. */ 9 #define S3C24XX_DMA_CHANREQ(src, chan) ((BIT(3) | src) << chan * 4) 10 11 enum s3c24xx_dma_bus { 12 S3C24XX_DMA_APB, 13 S3C24XX_DMA_AHB, 14 }; 15 16 /** 17 * @bus: on which bus does the peripheral reside - AHB or APB. 18 * @handshake: is a handshake with the peripheral necessary 19 * @chansel: channel selection information, depending on variant; reqsel for 20 * s3c2443 and later and channel-selection map for earlier SoCs 21 * see CHANSEL doc in s3c2443-dma.c 22 */ 23 struct s3c24xx_dma_channel { 24 enum s3c24xx_dma_bus bus; 25 bool handshake; 26 u16 chansel; 27 }; 28 29 struct dma_slave_map; 30 31 /** 32 * struct s3c24xx_dma_platdata - platform specific settings 33 * @num_phy_channels: number of physical channels 34 * @channels: array of virtual channel descriptions 35 * @num_channels: number of virtual channels 36 * @slave_map: dma slave map matching table 37 * @slavecnt: number of elements in slave_map 38 */ 39 struct s3c24xx_dma_platdata { 40 int num_phy_channels; 41 struct s3c24xx_dma_channel *channels; 42 int num_channels; 43 const struct dma_slave_map *slave_map; 44 int slavecnt; 45 }; 46 47 struct dma_chan; 48 bool s3c24xx_dma_filter(struct dma_chan *chan, void *param); 49