/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Renesas SuperH DMA Engine support
 *
 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
 *
 */
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H

#include <linux/sh_dma.h>
#include <linux/shdma-base.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/list.h>

#define SH_DMAE_MAX_CHANNELS 20
#define SH_DMAE_TCR_MAX 0x00FFFFFF      /* 16MB */

struct device;

struct sh_dmae_chan {
        struct shdma_chan shdma_chan;
        const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
        int xmit_shift;                 /* log_2(bytes_per_xfer) */
        void __iomem *base;
        char dev_id[32];                /* unique name per DMAC of channel */
        int pm_error;
        dma_addr_t slave_addr;
};

struct sh_dmae_device {
        struct shdma_dev shdma_dev;
        struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
        const struct sh_dmae_pdata *pdata;
        struct list_head node;
        void __iomem *chan_reg;
        void __iomem *dmars;
        unsigned int chcr_offset;
        u32 chcr_ie_bit;
};

struct sh_dmae_regs {
        u32 sar; /* SAR / source address */
        u32 dar; /* DAR / destination address */
        u32 tcr; /* TCR / transfer count */
};

struct sh_dmae_desc {
        struct sh_dmae_regs hw;
        struct shdma_desc shdma_desc;
};

#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
                                     struct sh_dmae_device, shdma_dev.dma_dev)

#endif  /* __DMA_SHDMA_H */