Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * arch/sh/drivers/dma/dma-isa.c

 *

 * Generic ISA DMA wrapper for SH DMA API

 *

 * Copyright (C) 2003, 2004  Paul Mundt

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <asm/dma.h>

/*

 * This implements a small wrapper set to make code using the old ISA DMA API

 * work with the SH DMA API. Since most of the work in the new API happens

 * at ops->xfer() time, we simply use the various set_dma_xxx() routines to

 * fill in per-channel info, and then hand hand this off to ops->xfer() at

 * enable_dma() time.

 *

 * For channels that are doing on-demand data transfer via cascading, the

 * channel itself will still need to be configured through the new API. As

 * such, this code is meant for only the simplest of tasks (and shouldn't be

 * used in any new drivers at all).

 *

 * NOTE: ops->xfer() is the preferred way of doing things. However, there

 * are some users of the ISA DMA API that exist in common code that we

 * don't necessarily want to go out of our way to break, so we still

 * allow for some compatibility at that level. Any new code is strongly

 * advised to run far away from the ISA DMA API and use the SH DMA API

 * directly.

 */

unsigned long claim_dma_lock(void)

{

        unsigned long flags;

        spin_lock_irqsave(&dma_spin_lock, flags);

        return flags;

}

EXPORT_SYMBOL(claim_dma_lock);

void release_dma_lock(unsigned long flags)

{

        spin_unlock_irqrestore(&dma_spin_lock, flags);

}

EXPORT_SYMBOL(release_dma_lock);

void disable_dma(unsigned int chan)

{

        /* Nothing */

}

EXPORT_SYMBOL(disable_dma);

void enable_dma(unsigned int chan)

{

        struct dma_info *info = get_dma_info(chan);

        struct dma_channel *channel = &info->channels[chan];

        info->ops->xfer(channel);

}

EXPORT_SYMBOL(enable_dma);

void clear_dma_ff(unsigned int chan)

{

        /* Nothing */

}

EXPORT_SYMBOL(clear_dma_ff);

void set_dma_mode(unsigned int chan, char mode)

{

        struct dma_info *info = get_dma_info(chan);

        struct dma_channel *channel = &info->channels[chan];

        channel->mode = mode;

}

EXPORT_SYMBOL(set_dma_mode);

void set_dma_addr(unsigned int chan, unsigned int addr)

{

        struct dma_info *info = get_dma_info(chan);

        struct dma_channel *channel = &info->channels[chan];

        /*

         * Single address mode is the only thing supported through

         * this interface.

         */

        if ((channel->mode & DMA_MODE_MASK) == DMA_MODE_READ) {

                channel->sar = addr;

        } else {

                channel->dar = addr;

        }

}

EXPORT_SYMBOL(set_dma_addr);

void set_dma_count(unsigned int chan, unsigned int count)

{

        struct dma_info *info = get_dma_info(chan);

        struct dma_channel *channel = &info->channels[chan];

        channel->count = count;

}

EXPORT_SYMBOL(set_dma_count);