[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / arch / ppc / syslib / ppc4xx_dma.c

/*
 * arch/ppc/kernel/ppc4xx_dma.c
 *
 * IBM PPC4xx DMA engine core library
 *
 * Copyright 2000-2004 MontaVista Software Inc.
 *
 * Cleaned up and converted to new DCR access
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * Original code by Armin Kuster <akuster@mvista.com>
 * and Pete Popov <ppopov@mvista.com>
 *
 * 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.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/module.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/ppc4xx_dma.h>

ppc_dma_ch_t dma_channels[MAX_PPC4xx_DMA_CHANNELS];

int
ppc4xx_get_dma_status(void)
{
        return (mfdcr(DCRN_DMASR));
}

void
ppc4xx_set_src_addr(int dmanr, phys_addr_t src_addr)
{
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("set_src_addr: bad channel: %d\n", dmanr);
                return;
        }

#ifdef PPC4xx_DMA_64BIT
        mtdcr(DCRN_DMASAH0 + dmanr*2, (u32)(src_addr >> 32));
#else
        mtdcr(DCRN_DMASA0 + dmanr*2, (u32)src_addr);
#endif
}

void
ppc4xx_set_dst_addr(int dmanr, phys_addr_t dst_addr)
{
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("set_dst_addr: bad channel: %d\n", dmanr);
                return;
        }

#ifdef PPC4xx_DMA_64BIT
        mtdcr(DCRN_DMADAH0 + dmanr*2, (u32)(dst_addr >> 32));
#else
        mtdcr(DCRN_DMADA0 + dmanr*2, (u32)dst_addr);
#endif
}

void
ppc4xx_enable_dma(unsigned int dmanr)
{
        unsigned int control;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
        unsigned int status_bits[] = { DMA_CS0 | DMA_TS0 | DMA_CH0_ERR,
                                       DMA_CS1 | DMA_TS1 | DMA_CH1_ERR,
                                       DMA_CS2 | DMA_TS2 | DMA_CH2_ERR,
                                       DMA_CS3 | DMA_TS3 | DMA_CH3_ERR};

        if (p_dma_ch->in_use) {
                printk("enable_dma: channel %d in use\n", dmanr);
                return;
        }

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("enable_dma: bad channel: %d\n", dmanr);
                return;
        }

        if (p_dma_ch->mode == DMA_MODE_READ) {
                /* peripheral to memory */
                ppc4xx_set_src_addr(dmanr, 0);
                ppc4xx_set_dst_addr(dmanr, p_dma_ch->addr);
        } else if (p_dma_ch->mode == DMA_MODE_WRITE) {
                /* memory to peripheral */
                ppc4xx_set_src_addr(dmanr, p_dma_ch->addr);
                ppc4xx_set_dst_addr(dmanr, 0);
        }

        /* for other xfer modes, the addresses are already set */
        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));

        control &= ~(DMA_TM_MASK | DMA_TD);     /* clear all mode bits */
        if (p_dma_ch->mode == DMA_MODE_MM) {
                /* software initiated memory to memory */
                control |= DMA_ETD_OUTPUT | DMA_TCE_ENABLE;
        }

        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        /*
         * Clear the CS, TS, RI bits for the channel from DMASR.  This
         * has been observed to happen correctly only after the mode and
         * ETD/DCE bits in DMACRx are set above.  Must do this before
         * enabling the channel.
         */

        mtdcr(DCRN_DMASR, status_bits[dmanr]);

        /*
         * For device-paced transfers, Terminal Count Enable apparently
         * must be on, and this must be turned on after the mode, etc.
         * bits are cleared above (at least on Redwood-6).
         */

        if ((p_dma_ch->mode == DMA_MODE_MM_DEVATDST) ||
            (p_dma_ch->mode == DMA_MODE_MM_DEVATSRC))
                control |= DMA_TCE_ENABLE;

        /*
         * Now enable the channel.
         */

        control |= (p_dma_ch->mode | DMA_CE_ENABLE);

        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        p_dma_ch->in_use = 1;
}

void
ppc4xx_disable_dma(unsigned int dmanr)
{
        unsigned int control;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (!p_dma_ch->in_use) {
                printk("disable_dma: channel %d not in use\n", dmanr);
                return;
        }

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("disable_dma: bad channel: %d\n", dmanr);
                return;
        }

        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
        control &= ~DMA_CE_ENABLE;
        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        p_dma_ch->in_use = 0;
}

/*
 * Sets the dma mode for single DMA transfers only.
 * For scatter/gather transfers, the mode is passed to the
 * alloc_dma_handle() function as one of the parameters.
 *
 * The mode is simply saved and used later.  This allows
 * the driver to call set_dma_mode() and set_dma_addr() in
 * any order.
 *
 * Valid mode values are:
 *
 * DMA_MODE_READ          peripheral to memory
 * DMA_MODE_WRITE         memory to peripheral
 * DMA_MODE_MM            memory to memory
 * DMA_MODE_MM_DEVATSRC   device-paced memory to memory, device at src
 * DMA_MODE_MM_DEVATDST   device-paced memory to memory, device at dst
 */
int
ppc4xx_set_dma_mode(unsigned int dmanr, unsigned int mode)
{
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("set_dma_mode: bad channel 0x%x\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        p_dma_ch->mode = mode;

        return DMA_STATUS_GOOD;
}

/*
 * Sets the DMA Count register. Note that 'count' is in bytes.
 * However, the DMA Count register counts the number of "transfers",
 * where each transfer is equal to the bus width.  Thus, count
 * MUST be a multiple of the bus width.
 */
void
ppc4xx_set_dma_count(unsigned int dmanr, unsigned int count)
{
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

#ifdef DEBUG_4xxDMA
        {
                int error = 0;
                switch (p_dma_ch->pwidth) {
                case PW_8:
                        break;
                case PW_16:
                        if (count & 0x1)
                                error = 1;
                        break;
                case PW_32:
                        if (count & 0x3)
                                error = 1;
                        break;
                case PW_64:
                        if (count & 0x7)
                                error = 1;
                        break;
                default:
                        printk("set_dma_count: invalid bus width: 0x%x\n",
                               p_dma_ch->pwidth);
                        return;
                }
                if (error)
                        printk
                            ("Warning: set_dma_count count 0x%x bus width %d\n",
                             count, p_dma_ch->pwidth);
        }
#endif

        count = count >> p_dma_ch->shift;

        mtdcr(DCRN_DMACT0 + (dmanr * 0x8), count);
}

/*
 *   Returns the number of bytes left to be transfered.
 *   After a DMA transfer, this should return zero.
 *   Reading this while a DMA transfer is still in progress will return
 *   unpredictable results.
 */
int
ppc4xx_get_dma_residue(unsigned int dmanr)
{
        unsigned int count;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_get_dma_residue: bad channel 0x%x\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        count = mfdcr(DCRN_DMACT0 + (dmanr * 0x8));

        return (count << p_dma_ch->shift);
}

/*
 * Sets the DMA address for a memory to peripheral or peripheral
 * to memory transfer.  The address is just saved in the channel
 * structure for now and used later in enable_dma().
 */
void
ppc4xx_set_dma_addr(unsigned int dmanr, phys_addr_t addr)
{
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_set_dma_addr: bad channel: %d\n", dmanr);
                return;
        }

#ifdef DEBUG_4xxDMA
        {
                int error = 0;
                switch (p_dma_ch->pwidth) {
                case PW_8:
                        break;
                case PW_16:
                        if ((unsigned) addr & 0x1)
                                error = 1;
                        break;
                case PW_32:
                        if ((unsigned) addr & 0x3)
                                error = 1;
                        break;
                case PW_64:
                        if ((unsigned) addr & 0x7)
                                error = 1;
                        break;
                default:
                        printk("ppc4xx_set_dma_addr: invalid bus width: 0x%x\n",
                               p_dma_ch->pwidth);
                        return;
                }
                if (error)
                        printk("Warning: ppc4xx_set_dma_addr addr 0x%x bus width %d\n",
                               addr, p_dma_ch->pwidth);
        }
#endif

        /* save dma address and program it later after we know the xfer mode */
        p_dma_ch->addr = addr;
}

/*
 * Sets both DMA addresses for a memory to memory transfer.
 * For memory to peripheral or peripheral to memory transfers
 * the function set_dma_addr() should be used instead.
 */
void
ppc4xx_set_dma_addr2(unsigned int dmanr, phys_addr_t src_dma_addr,
                     phys_addr_t dst_dma_addr)
{
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_set_dma_addr2: bad channel: %d\n", dmanr);
                return;
        }

#ifdef DEBUG_4xxDMA
        {
                ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];
                int error = 0;
                switch (p_dma_ch->pwidth) {
                        case PW_8:
                                break;
                        case PW_16:
                                if (((unsigned) src_dma_addr & 0x1) ||
                                                ((unsigned) dst_dma_addr & 0x1)
                                   )
                                        error = 1;
                                break;
                        case PW_32:
                                if (((unsigned) src_dma_addr & 0x3) ||
                                                ((unsigned) dst_dma_addr & 0x3)
                                   )
                                        error = 1;
                                break;
                        case PW_64:
                                if (((unsigned) src_dma_addr & 0x7) ||
                                                ((unsigned) dst_dma_addr & 0x7)
                                   )
                                        error = 1;
                                break;
                        default:
                                printk("ppc4xx_set_dma_addr2: invalid bus width: 0x%x\n",
                                                p_dma_ch->pwidth);
                                return;
                }
                if (error)
                        printk
                                ("Warning: ppc4xx_set_dma_addr2 src 0x%x dst 0x%x bus width %d\n",
                                 src_dma_addr, dst_dma_addr, p_dma_ch->pwidth);
        }
#endif

        ppc4xx_set_src_addr(dmanr, src_dma_addr);
        ppc4xx_set_dst_addr(dmanr, dst_dma_addr);
}

/*
 * Enables the channel interrupt.
 *
 * If performing a scatter/gatter transfer, this function
 * MUST be called before calling alloc_dma_handle() and building
 * the sgl list.  Otherwise, interrupts will not be enabled, if
 * they were previously disabled.
 */
int
ppc4xx_enable_dma_interrupt(unsigned int dmanr)
{
        unsigned int control;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_enable_dma_interrupt: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        p_dma_ch->int_enable = 1;

        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
        control |= DMA_CIE_ENABLE;      /* Channel Interrupt Enable */
        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        return DMA_STATUS_GOOD;
}

/*
 * Disables the channel interrupt.
 *
 * If performing a scatter/gatter transfer, this function
 * MUST be called before calling alloc_dma_handle() and building
 * the sgl list.  Otherwise, interrupts will not be disabled, if
 * they were previously enabled.
 */
int
ppc4xx_disable_dma_interrupt(unsigned int dmanr)
{
        unsigned int control;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_disable_dma_interrupt: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        p_dma_ch->int_enable = 0;

        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
        control &= ~DMA_CIE_ENABLE;     /* Channel Interrupt Enable */
        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        return DMA_STATUS_GOOD;
}

/*
 * Configures a DMA channel, including the peripheral bus width, if a
 * peripheral is attached to the channel, the polarity of the DMAReq and
 * DMAAck signals, etc.  This information should really be setup by the boot
 * code, since most likely the configuration won't change dynamically.
 * If the kernel has to call this function, it's recommended that it's
 * called from platform specific init code.  The driver should not need to
 * call this function.
 */
int
ppc4xx_init_dma_channel(unsigned int dmanr, ppc_dma_ch_t * p_init)
{
        unsigned int polarity;
        uint32_t control = 0;
        ppc_dma_ch_t *p_dma_ch = &dma_channels[dmanr];

        DMA_MODE_READ = (unsigned long) DMA_TD; /* Peripheral to Memory */
        DMA_MODE_WRITE = 0;     /* Memory to Peripheral */

        if (!p_init) {
                printk("ppc4xx_init_dma_channel: NULL p_init\n");
                return DMA_STATUS_NULL_POINTER;
        }

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_init_dma_channel: bad channel %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

#if DCRN_POL > 0
        polarity = mfdcr(DCRN_POL);
#else
        polarity = 0;
#endif

        /* Setup the control register based on the values passed to
         * us in p_init.  Then, over-write the control register with this
         * new value.
         */
        control |= SET_DMA_CONTROL;

        /* clear all polarity signals and then "or" in new signal levels */
        polarity &= ~GET_DMA_POLARITY(dmanr);
        polarity |= p_init->polarity;
#if DCRN_POL > 0
        mtdcr(DCRN_POL, polarity);
#endif
        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        /* save these values in our dma channel structure */
        memcpy(p_dma_ch, p_init, sizeof (ppc_dma_ch_t));

        /*
         * The peripheral width values written in the control register are:
         *   PW_8                 0
         *   PW_16                1
         *   PW_32                2
         *   PW_64                3
         *
         *   Since the DMA count register takes the number of "transfers",
         *   we need to divide the count sent to us in certain
         *   functions by the appropriate number.  It so happens that our
         *   right shift value is equal to the peripheral width value.
         */
        p_dma_ch->shift = p_init->pwidth;

        /*
         * Save the control word for easy access.
         */
        p_dma_ch->control = control;

        mtdcr(DCRN_DMASR, 0xffffffff);  /* clear status register */
        return DMA_STATUS_GOOD;
}

/*
 * This function returns the channel configuration.
 */
int
ppc4xx_get_channel_config(unsigned int dmanr, ppc_dma_ch_t * p_dma_ch)
{
        unsigned int polarity;
        unsigned int control;

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_get_channel_config: bad channel %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        memcpy(p_dma_ch, &dma_channels[dmanr], sizeof (ppc_dma_ch_t));

#if DCRN_POL > 0
        polarity = mfdcr(DCRN_POL);
#else
        polarity = 0;
#endif

        p_dma_ch->polarity = polarity & GET_DMA_POLARITY(dmanr);
        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));

        p_dma_ch->cp = GET_DMA_PRIORITY(control);
        p_dma_ch->pwidth = GET_DMA_PW(control);
        p_dma_ch->psc = GET_DMA_PSC(control);
        p_dma_ch->pwc = GET_DMA_PWC(control);
        p_dma_ch->phc = GET_DMA_PHC(control);
        p_dma_ch->ce = GET_DMA_CE_ENABLE(control);
        p_dma_ch->int_enable = GET_DMA_CIE_ENABLE(control);
        p_dma_ch->shift = GET_DMA_PW(control);

#ifdef CONFIG_PPC4xx_EDMA
        p_dma_ch->pf = GET_DMA_PREFETCH(control);
#else
        p_dma_ch->ch_enable = GET_DMA_CH(control);
        p_dma_ch->ece_enable = GET_DMA_ECE(control);
        p_dma_ch->tcd_disable = GET_DMA_TCD(control);
#endif
        return DMA_STATUS_GOOD;
}

/*
 * Sets the priority for the DMA channel dmanr.
 * Since this is setup by the hardware init function, this function
 * can be used to dynamically change the priority of a channel.
 *
 * Acceptable priorities:
 *
 * PRIORITY_LOW
 * PRIORITY_MID_LOW
 * PRIORITY_MID_HIGH
 * PRIORITY_HIGH
 *
 */
int
ppc4xx_set_channel_priority(unsigned int dmanr, unsigned int priority)
{
        unsigned int control;

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_set_channel_priority: bad channel %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        if ((priority != PRIORITY_LOW) &&
            (priority != PRIORITY_MID_LOW) &&
            (priority != PRIORITY_MID_HIGH) && (priority != PRIORITY_HIGH)) {
                printk("ppc4xx_set_channel_priority: bad priority: 0x%x\n", priority);
        }

        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));
        control |= SET_DMA_PRIORITY(priority);
        mtdcr(DCRN_DMACR0 + (dmanr * 0x8), control);

        return DMA_STATUS_GOOD;
}

/*
 * Returns the width of the peripheral attached to this channel. This assumes
 * that someone who knows the hardware configuration, boot code or some other
 * init code, already set the width.
 *
 * The return value is one of:
 *   PW_8
 *   PW_16
 *   PW_32
 *   PW_64
 *
 *   The function returns 0 on error.
 */
unsigned int
ppc4xx_get_peripheral_width(unsigned int dmanr)
{
        unsigned int control;

        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk("ppc4xx_get_peripheral_width: bad channel %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }

        control = mfdcr(DCRN_DMACR0 + (dmanr * 0x8));

        return (GET_DMA_PW(control));
}

/*
 * Clears the channel status bits
 */
int
ppc4xx_clr_dma_status(unsigned int dmanr)
{
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk(KERN_ERR "ppc4xx_clr_dma_status: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }
        mtdcr(DCRN_DMASR, ((u32)DMA_CH0_ERR | (u32)DMA_CS0 | (u32)DMA_TS0) >> dmanr);
        return DMA_STATUS_GOOD;
}

/*
 * Enables the burst on the channel (BTEN bit in the control/count register)
 * Note:
 * For scatter/gather dma, this function MUST be called before the
 * ppc4xx_alloc_dma_handle() func as the chan count register is copied into the
 * sgl list and used as each sgl element is added.
 */
int
ppc4xx_enable_burst(unsigned int dmanr)
{
        unsigned int ctc;
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk(KERN_ERR "ppc4xx_enable_burst: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }
        ctc = mfdcr(DCRN_DMACT0 + (dmanr * 0x8)) | DMA_CTC_BTEN;
        mtdcr(DCRN_DMACT0 + (dmanr * 0x8), ctc);
        return DMA_STATUS_GOOD;
}
/*
 * Disables the burst on the channel (BTEN bit in the control/count register)
 * Note:
 * For scatter/gather dma, this function MUST be called before the
 * ppc4xx_alloc_dma_handle() func as the chan count register is copied into the
 * sgl list and used as each sgl element is added.
 */
int
ppc4xx_disable_burst(unsigned int dmanr)
{
        unsigned int ctc;
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk(KERN_ERR "ppc4xx_disable_burst: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }
        ctc = mfdcr(DCRN_DMACT0 + (dmanr * 0x8)) &~ DMA_CTC_BTEN;
        mtdcr(DCRN_DMACT0 + (dmanr * 0x8), ctc);
        return DMA_STATUS_GOOD;
}
/*
 * Sets the burst size (number of peripheral widths) for the channel
 * (BSIZ bits in the control/count register))
 * must be one of:
 *    DMA_CTC_BSIZ_2
 *    DMA_CTC_BSIZ_4
 *    DMA_CTC_BSIZ_8
 *    DMA_CTC_BSIZ_16
 * Note:
 * For scatter/gather dma, this function MUST be called before the
 * ppc4xx_alloc_dma_handle() func as the chan count register is copied into the
 * sgl list and used as each sgl element is added.
 */
int
ppc4xx_set_burst_size(unsigned int dmanr, unsigned int bsize)
{
        unsigned int ctc;
        if (dmanr >= MAX_PPC4xx_DMA_CHANNELS) {
                printk(KERN_ERR "ppc4xx_set_burst_size: bad channel: %d\n", dmanr);
                return DMA_STATUS_BAD_CHANNEL;
        }
        ctc = mfdcr(DCRN_DMACT0 + (dmanr * 0x8)) &~ DMA_CTC_BSIZ_MSK;
        ctc |= (bsize & DMA_CTC_BSIZ_MSK);
        mtdcr(DCRN_DMACT0 + (dmanr * 0x8), ctc);
        return DMA_STATUS_GOOD;
}

EXPORT_SYMBOL(ppc4xx_init_dma_channel);
EXPORT_SYMBOL(ppc4xx_get_channel_config);
EXPORT_SYMBOL(ppc4xx_set_channel_priority);
EXPORT_SYMBOL(ppc4xx_get_peripheral_width);
EXPORT_SYMBOL(dma_channels);
EXPORT_SYMBOL(ppc4xx_set_src_addr);
EXPORT_SYMBOL(ppc4xx_set_dst_addr);
EXPORT_SYMBOL(ppc4xx_set_dma_addr);
EXPORT_SYMBOL(ppc4xx_set_dma_addr2);
EXPORT_SYMBOL(ppc4xx_enable_dma);
EXPORT_SYMBOL(ppc4xx_disable_dma);
EXPORT_SYMBOL(ppc4xx_set_dma_mode);
EXPORT_SYMBOL(ppc4xx_set_dma_count);
EXPORT_SYMBOL(ppc4xx_get_dma_residue);
EXPORT_SYMBOL(ppc4xx_enable_dma_interrupt);
EXPORT_SYMBOL(ppc4xx_disable_dma_interrupt);
EXPORT_SYMBOL(ppc4xx_get_dma_status);
EXPORT_SYMBOL(ppc4xx_clr_dma_status);
EXPORT_SYMBOL(ppc4xx_enable_burst);
EXPORT_SYMBOL(ppc4xx_disable_burst);
EXPORT_SYMBOL(ppc4xx_set_burst_size);