linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * BCM2835 DMA engine support

 *

 * Author:      Florian Meier <florian.meier@koalo.de>

 *              Copyright 2013

 *

 * Based on

 *  OMAP DMAengine support by Russell King

 *

 *  BCM2708 DMA Driver

 *  Copyright (C) 2010 Broadcom

 *

 *  Raspberry Pi PCM I2S ALSA Driver

 *  Copyright (c) by Phil Poole 2013

 *

 *  MARVELL MMP Peripheral DMA Driver

 *  Copyright 2012 Marvell International Ltd.

 */

#include <linux/dmaengine.h>

#include <linux/dma-mapping.h>

#include <linux/dmapool.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/io.h>

#include <linux/spinlock.h>

#include <linux/of.h>

#include <linux/of_dma.h>

​

#include "virt-dma.h"

​

#define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14

#define BCM2835_DMA_CHAN_NAME_SIZE 8

​

struct bcm2835_dmadev {

    struct dma_device ddev;

    void __iomem *base;

    struct device_dma_parameters dma_parms;

};

​

struct bcm2835_dma_cb {

    uint32_t info;

    uint32_t src;

    uint32_t dst;

    uint32_t length;

    uint32_t stride;

    uint32_t next;

    uint32_t pad[2];

};

​

struct bcm2835_cb_entry {

    struct bcm2835_dma_cb *cb;

    dma_addr_t paddr;

};

​

struct bcm2835_chan {

    struct virt_dma_chan vc;

​

    struct dma_slave_config cfg;

    unsigned int dreq;

​

    int ch;

    struct bcm2835_desc *desc;

    struct dma_pool *cb_pool;

​

    void __iomem *chan_base;

    int irq_number;

    unsigned int irq_flags;

​

    bool is_lite_channel;

};

​

struct bcm2835_desc {

    struct bcm2835_chan *c;

    struct virt_dma_desc vd;

    enum dma_transfer_direction dir;

​

    unsigned int frames;

    size_t size;

​

    bool cyclic;

​

    struct bcm2835_cb_entry cb_list[];

};

​

#define BCM2835_DMA_CS      0x00

#define BCM2835_DMA_ADDR    0x04