/*
* 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_platform.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)
{
DMA_OUT(chan, &chan->regs->sr, val, 32);
}
static u32 get_sr(struct fsldma_chan *chan)
{
return DMA_IN(chan, &chan->regs->sr, 32);
}
static void 