linux-imx

/*

 * Freescale MPC85xx, MPC83xx DMA Engine support

 *

 * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved.

 *

 * Author:

 *   Zhang Wei <wei.zhang@freescale.com>, Jul 2007

 *   Ebony Zhu <ebony.zhu@freescale.com>, May 2007

 *

 * Description:

 *   DMA engine driver for Freescale MPC8540 DMA controller, which is

 *   also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc.

 *   The support for MPC8349 DMA controller is also added.

 *

 * This driver instructs the DMA controller to issue the PCI Read Multiple

 * command for PCI read operations, instead of using the default PCI Read Line

 * command. Please be aware that this setting may result in read pre-fetching

 * on some platforms.

 *

 * This 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.

 *

 */

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <linux/dmaengine.h>

#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/dmapool.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/fsldma.h>

#include "dmaengine.h"

#include "fsldma.h"

​

#define chan_dbg(chan, fmt, arg...)                 \

    dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg)

#define chan_err(chan, fmt, arg...)                 \

    dev_err(chan->dev, "%s: " fmt, chan->name, ##arg)

​

static const char msg_ld_oom[] = "No free memory for link descriptor";

​

/*

 * Register Helpers

 */

​

static void set_sr(struct fsldma_chan *chan, u32 val)

{

    FSL_DMA_OUT(chan, &chan->regs->sr, val, 32);

}

​

static u32 get_sr(struct fsldma_chan *chan)

{

    return FSL_DMA_IN(chan, &chan->regs->sr, 32);

}

​