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/*
* arch/arm/mach-tegra/include/mach/dma.h
*
* Copyright (c) 2008-2009, NVIDIA Corporation.
*
* 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 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __MACH_TEGRA_DMA_H
#if defined(CONFIG_TEGRA_SYSTEM_DMA)
struct tegra_dma_req;
enum tegra_dma_mode {
TEGRA_DMA_SHARED = 1,
TEGRA_DMA_MODE_CONTINOUS = 2,
TEGRA_DMA_MODE_ONESHOT = 4,
};
enum tegra_dma_req_error {
TEGRA_DMA_REQ_ERROR_ABOTRED,
};
enum tegra_dma_req_buff_status {
TEGRA_DMA_REQ_BUF_STATUS_EMPTY,
TEGRA_DMA_REQ_BUF_STATUS_HALF_FULL,
TEGRA_DMA_REQ_BUF_STATUS_FULL,
};
struct tegra_dma_req {
struct list_head list;
unsigned int modid;
int instance;
/* Called when the req is complete and from the DMA ISR context.
* When this is called the req structure is no longer queued by
* the DMA channel.
*
* State of the DMA depends on the number of req it has. If there are
* no DMA requests queued up, then it will STOP the DMA. It there are
* more requests in the DMA, then it will queue the next request.
*/
void (*complete)(struct tegra_dma_req *req, int err);
/* This is a called from the DMA ISR context when the DMA is still in
* progress and is actively filling same buffer.
*
* In case of continous mode receive, this threshold is 1/2 the buffer
* size. In other cases, this will not even be called as there is no
* hardware support for it.
*
* In the case of continous mode receive, if there is next req already
* queued, DMA programs the HW to use that req when this req is
* completed. If there is no "next req" queued, then DMA ISR doesn't do
* anything before calling this callback.
*
* This is mainly used by the cases, where the clients has queued
* only one req and want to get some sort of DMA threshold
* callback to program the next buffer.
*
*/
void (*threshold)(struct tegra_dma_req *req, int err);
/* 1 to copy to memory.
* 0 to copy from the memory to device FIFO */
int to_memory;
void *virt_addr;
unsigned long source_addr;
unsigned long dest_addr;
unsigned long dest_wrap;
unsigned long source_wrap;
unsigned int size;
/* Updated by the DMA driver on the conpletion of the request. */
int bytes_transferred;
int status;
/* DMA completion tracking information */
int buffer_status;
/* Client specific data */
void *data;
};
int tegra_dma_enqueue_req(int channel, struct tegra_dma_req *req);
int tegra_dma_dequeue_req(int channel, struct tegra_dma_req *req);
void tegra_dma_dequeue(int channel);
void tegra_dma_flush(int channel);
bool tegra_dma_is_req_inflight(int channel, struct tegra_dma_req *req);
bool tegra_dma_is_empty(int channel);
int tegra_dma_allocate_channel(int mode);
void tegra_dma_free_channel(int channel);
int __init tegra_dma_init(void);
#endif
#endif
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