LXR linux/drivers/dma/sh/shdma.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Renesas SuperH DMA Engine support
   4 *
   5 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   6 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
   7 *
   8 */
   9#ifndef __DMA_SHDMA_H
  10#define __DMA_SHDMA_H
  11
  12#include <linux/sh_dma.h>
  13#include <linux/shdma-base.h>
  14#include <linux/dmaengine.h>
  15#include <linux/interrupt.h>
  16#include <linux/list.h>
  17
  18#define SH_DMAE_MAX_CHANNELS 20
  19#define SH_DMAE_TCR_MAX 0x00FFFFFF      /* 16MB */
  20
  21struct device;
  22
  23struct sh_dmae_chan {
  24        struct shdma_chan shdma_chan;
  25        const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
  26        int xmit_shift;                 /* log_2(bytes_per_xfer) */
  27        void __iomem *base;
  28        char dev_id[16];                /* unique name per DMAC of channel */
  29        int pm_error;
  30        dma_addr_t slave_addr;
  31};
  32
  33struct sh_dmae_device {
  34        struct shdma_dev shdma_dev;
  35        struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
  36        const struct sh_dmae_pdata *pdata;
  37        struct list_head node;
  38        void __iomem *chan_reg;
  39        void __iomem *dmars;
  40        unsigned int chcr_offset;
  41        u32 chcr_ie_bit;
  42};
  43
  44struct sh_dmae_regs {
  45        u32 sar; /* SAR / source address */
  46        u32 dar; /* DAR / destination address */
  47        u32 tcr; /* TCR / transfer count */
  48};
  49
  50struct sh_dmae_desc {
  51        struct sh_dmae_regs hw;
  52        struct shdma_desc shdma_desc;
  53};
  54
  55#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
  56#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
  57#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
  58#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
  59                                     struct sh_dmae_device, shdma_dev.dma_dev)
  60
  61#ifdef CONFIG_SH_DMAE_R8A73A4
  62extern const struct sh_dmae_pdata r8a73a4_dma_pdata;
  63#define r8a73a4_shdma_devid (&r8a73a4_dma_pdata)
  64#else
  65#define r8a73a4_shdma_devid NULL
  66#endif
  67
  68#endif  /* __DMA_SHDMA_H */
  69