include/linux/platform_data/dma-s3c24xx.h

   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);