blob: 7379731afd793215e9819d6e831541a19e8abedc [file] [log] [blame]
* On-chip DMA controller framework.
* Copyright (C) 2008 Nokia Corporation
* Written by Andrzej Zaborowski <>
* 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
* 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 <>.
#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 {
enum soc_dma_access_type {
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);