Archipelago » qemu

/*

 * On-chip DMA controller framework.

 *

 * Copyright (C) 2008 Nokia Corporation

 * Written by Andrzej Zaborowski <andrew@openedhand.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 or

 * (at your option) version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, see <http://www.gnu.org/licenses/>.

 */

#ifndef HW_SOC_DMA_H

#define HW_SOC_DMA_H 1

#include "exec/memory.h"

#include "hw/irq.h"

struct soc_dma_s;

struct soc_dma_ch_s;

typedef void (*soc_dma_io_t)(void *opaque, uint8_t *buf, int len);

typedef void (*soc_dma_transfer_t)(struct soc_dma_ch_s *ch);

enum soc_dma_port_type {

    soc_dma_port_mem,

    soc_dma_port_fifo,

    soc_dma_port_other,

};

enum soc_dma_access_type {

    soc_dma_access_const,

    soc_dma_access_linear,

    soc_dma_access_other,

};

struct soc_dma_ch_s {

    /* Private */

    struct soc_dma_s *dma;

    int num;

    QEMUTimer *timer;

    /* Set by soc_dma.c */

    int enable;

    int update;

    /* This should be set by dma->setup_fn().  */

    int bytes;

    /* Initialised by the DMA module, call soc_dma_ch_update after writing.  */

    enum soc_dma_access_type type[2];

    hwaddr vaddr[2];        /* Updated by .transfer_fn().  */

    /* Private */

    void *paddr[2];

    soc_dma_io_t io_fn[2];

    void *io_opaque[2];

    int running;

    soc_dma_transfer_t transfer_fn;

    /* Set and used by the DMA module.  */

    void *opaque;

};

struct soc_dma_s {

    /* Following fields are set by the SoC DMA module and can be used

     * by anybody.  */

    uint64_t drqbmp;        /* Is zeroed by soc_dma_reset() */

    qemu_irq *drq;

    void *opaque;

    int64_t freq;

    soc_dma_transfer_t transfer_fn;

    soc_dma_transfer_t setup_fn;

    /* Set by soc_dma_init() for use by the DMA module.  */

    struct soc_dma_ch_s *ch;

};

/* Call to activate or stop a DMA channel.  */

void soc_dma_set_request(struct soc_dma_ch_s *ch, int level);

/* Call after every write to one of the following fields and before

 * calling soc_dma_set_request(ch, 1):

 *   ch->type[0...1],

 *   ch->vaddr[0...1],

 *   ch->paddr[0...1],

 * or after a soc_dma_port_add_fifo() or soc_dma_port_add_mem().  */

void soc_dma_ch_update(struct soc_dma_ch_s *ch);

/* The SoC should call this when the DMA module is being reset.  */

void soc_dma_reset(struct soc_dma_s *s);

struct soc_dma_s *soc_dma_init(int n);

void soc_dma_port_add_fifo(struct soc_dma_s *dma, hwaddr virt_base,

                soc_dma_io_t fn, void *opaque, int out);

void soc_dma_port_add_mem(struct soc_dma_s *dma, uint8_t *phys_base,

                hwaddr virt_base, size_t size);

static inline void soc_dma_port_add_fifo_in(struct soc_dma_s *dma,

                hwaddr virt_base, soc_dma_io_t fn, void *opaque)

{

    return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 0);

}

static inline void soc_dma_port_add_fifo_out(struct soc_dma_s *dma,

                hwaddr virt_base, soc_dma_io_t fn, void *opaque)

{

    return soc_dma_port_add_fifo(dma, virt_base, fn, opaque, 1);

}

#endif