1 /* 2 * S3C24XX DMA handling 3 * 4 * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 */ 11 12 /* Helper to encode the source selection constraints for early s3c socs. */ 13 #define S3C24XX_DMA_CHANREQ(src, chan) ((BIT(3) | src) << chan * 4) 14 15 enum s3c24xx_dma_bus { 16 S3C24XX_DMA_APB, 17 S3C24XX_DMA_AHB, 18 }; 19 20 /** 21 * @bus: on which bus does the peripheral reside - AHB or APB. 22 * @handshake: is a handshake with the peripheral necessary 23 * @chansel: channel selection information, depending on variant; reqsel for 24 * s3c2443 and later and channel-selection map for earlier SoCs 25 * see CHANSEL doc in s3c2443-dma.c 26 */ 27 struct s3c24xx_dma_channel { 28 enum s3c24xx_dma_bus bus; 29 bool handshake; 30 u16 chansel; 31 }; 32 33 struct dma_slave_map; 34 35 /** 36 * struct s3c24xx_dma_platdata - platform specific settings 37 * @num_phy_channels: number of physical channels 38 * @channels: array of virtual channel descriptions 39 * @num_channels: number of virtual channels 40 * @slave_map: dma slave map matching table 41 * @slavecnt: number of elements in slave_map 42 */ 43 struct s3c24xx_dma_platdata { 44 int num_phy_channels; 45 struct s3c24xx_dma_channel *channels; 46 int num_channels; 47 const struct dma_slave_map *slave_map; 48 int slavecnt; 49 }; 50 51 struct dma_chan; 52 bool s3c24xx_dma_filter(struct dma_chan *chan, void *param); 53