include/linux/platform_data/dma-s3c24xx.h

   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 /**
  34  * struct s3c24xx_dma_platdata - platform specific settings
  35  * @num_phy_channels: number of physical channels
  36  * @channels: array of virtual channel descriptions
  37  * @num_channels: number of virtual channels
  38  */
  39 struct s3c24xx_dma_platdata {
  40         int num_phy_channels;
  41         struct s3c24xx_dma_channel *channels;
  42         int num_channels;
  43 };
  44
  45 struct dma_chan;
  46 bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);