linux-imx

/*

 * timb_dma.c timberdale FPGA DMA driver

 * Copyright (c) 2010 Intel Corporation

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * 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.

 */

​

/* Supports:

 * Timberdale FPGA DMA engine

 */

​

#include <linux/dmaengine.h>

#include <linux/dma-mapping.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

​

#include <linux/timb_dma.h>

​

#include "dmaengine.h"

​

#define DRIVER_NAME "timb-dma"

​

/* Global DMA registers */

#define TIMBDMA_ACR     0x34

#define TIMBDMA_32BIT_ADDR  0x01

​

#define TIMBDMA_ISR     0x080000

#define TIMBDMA_IPR     0x080004

#define TIMBDMA_IER     0x080008

​

/* Channel specific registers */

/* RX instances base addresses are 0x00, 0x40, 0x80 ...

 * TX instances base addresses are 0x18, 0x58, 0x98 ...

 */

#define TIMBDMA_INSTANCE_OFFSET     0x40

#define TIMBDMA_INSTANCE_TX_OFFSET  0x18

​

/* RX registers, relative the instance base */

#define TIMBDMA_OFFS_RX_DHAR    0x00

#define TIMBDMA_OFFS_RX_DLAR    0x04

#define TIMBDMA_OFFS_RX_LR  0x0C

#define TIMBDMA_OFFS_RX_BLR 0x10

#define TIMBDMA_OFFS_RX_ER  0x14

#define TIMBDMA_RX_EN       0x01

/* bytes per Row, video specific register

 * which is placed after the TX registers...

 */

#define TIMBDMA_OFFS_RX_BPRR    0x30

​

/* TX registers, relative the instance base */

#define TIMBDMA_OFFS_TX_DHAR    0x00

#define TIMBDMA_OFFS_TX_DLAR    0x04