LXR linux/include/linux/platform

   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
  11enum 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 */
  23struct s3c24xx_dma_channel {
  24        enum s3c24xx_dma_bus bus;
  25        bool handshake;
  26        u16 chansel;
  27};
  28
  29struct 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 */
  39struct 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
  47struct dma_chan;
  48bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);
  49