arch/mips/include/asm/mach-au1x00/au1000_dma.h - kernel/msm-4.9 - Gitiles

 /*
  * BRIEF MODULE DESCRIPTION
  *	Defines for using and allocating DMA channels on the Alchemy
  *      Au1x00 MIPS processors.
  *
  * Copyright 2000, 2008 MontaVista Software Inc.
  * Author: MontaVista Software, Inc. <source@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.
  *
  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  *  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.
  *
  */
 #ifndef __ASM_AU1000_DMA_H
 #define __ASM_AU1000_DMA_H

 #include <linux/io.h>		/* need byte IO */
 #include <linux/spinlock.h>	/* And spinlocks */
 #include <linux/delay.h>
 #include <asm/system.h>

 #define NUM_AU1000_DMA_CHANNELS	8

 /* DMA Channel Base Addresses */
 #define DMA_CHANNEL_BASE	0xB4002000
 #define DMA_CHANNEL_LEN		0x00000100

 /* DMA Channel Register Offsets */
 #define DMA_MODE_SET		0x00000000
 #define DMA_MODE_READ		DMA_MODE_SET
 #define DMA_MODE_CLEAR		0x00000004
 /* DMA Mode register bits follow */
 #define DMA_DAH_MASK		(0x0f << 20)
 #define DMA_DID_BIT		16
 #define DMA_DID_MASK		(0x0f << DMA_DID_BIT)
 #define DMA_DS			(1 << 15)
 #define DMA_BE			(1 << 13)
 #define DMA_DR			(1 << 12)
 #define DMA_TS8 		(1 << 11)
 #define DMA_DW_BIT		9
 #define DMA_DW_MASK		(0x03 << DMA_DW_BIT)
 #define DMA_DW8			(0 << DMA_DW_BIT)
 #define DMA_DW16		(1 << DMA_DW_BIT)
 #define DMA_DW32		(2 << DMA_DW_BIT)
 #define DMA_NC			(1 << 8)
 #define DMA_IE			(1 << 7)
 #define DMA_HALT		(1 << 6)
 #define DMA_GO			(1 << 5)
 #define DMA_AB			(1 << 4)
 #define DMA_D1			(1 << 3)
 #define DMA_BE1 		(1 << 2)
 #define DMA_D0			(1 << 1)
 #define DMA_BE0 		(1 << 0)

 #define DMA_PERIPHERAL_ADDR	0x00000008
 #define DMA_BUFFER0_START	0x0000000C
 #define DMA_BUFFER1_START	0x00000014
 #define DMA_BUFFER0_COUNT	0x00000010
 #define DMA_BUFFER1_COUNT	0x00000018
 #define DMA_BAH_BIT	16
 #define DMA_BAH_MASK	(0x0f << DMA_BAH_BIT)
 #define DMA_COUNT_BIT	0
 #define DMA_COUNT_MASK	(0xffff << DMA_COUNT_BIT)

 /* DMA Device IDs follow */
 enum {
 	DMA_ID_UART0_TX = 0,
 	DMA_ID_UART0_RX,
 	DMA_ID_GP04,
 	DMA_ID_GP05,
 	DMA_ID_AC97C_TX,
 	DMA_ID_AC97C_RX,
 	DMA_ID_UART3_TX,
 	DMA_ID_UART3_RX,
 	DMA_ID_USBDEV_EP0_RX,
 	DMA_ID_USBDEV_EP0_TX,
 	DMA_ID_USBDEV_EP2_TX,
 	DMA_ID_USBDEV_EP3_TX,
 	DMA_ID_USBDEV_EP4_RX,
 	DMA_ID_USBDEV_EP5_RX,
 	DMA_ID_I2S_TX,
 	DMA_ID_I2S_RX,
 	DMA_NUM_DEV
 };

 /* DMA Device ID's for 2nd bank (AU1100) follow */
 enum {
 	DMA_ID_SD0_TX = 0,
 	DMA_ID_SD0_RX,
 	DMA_ID_SD1_TX,
 	DMA_ID_SD1_RX,
 	DMA_NUM_DEV_BANK2
 };

 struct dma_chan {
 	int dev_id;		/* this channel is allocated if >= 0, */
 				/* free otherwise */
 	unsigned int io;
 	const char *dev_str;
 	int irq;
 	void *irq_dev;
 	unsigned int fifo_addr;
 	unsigned int mode;
 };

 /* These are in arch/mips/au1000/common/dma.c */
 extern struct dma_chan au1000_dma_table[];
 extern int request_au1000_dma(int dev_id,
 			      const char *dev_str,
 			      irq_handler_t irqhandler,
 			      unsigned long irqflags,
 			      void *irq_dev_id);
 extern void free_au1000_dma(unsigned int dmanr);
 extern int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
 				int length, int *eof, void *data);
 extern void dump_au1000_dma_channel(unsigned int dmanr);
 extern spinlock_t au1000_dma_spin_lock;

 static inline struct dma_chan *get_dma_chan(unsigned int dmanr)
 {
 	if (dmanr >= NUM_AU1000_DMA_CHANNELS ||
 	    au1000_dma_table[dmanr].dev_id < 0)
 		return NULL;
 	return &au1000_dma_table[dmanr];
 }

 static inline unsigned long claim_dma_lock(void)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&au1000_dma_spin_lock, flags);
 	return flags;
 }

 static inline void release_dma_lock(unsigned long flags)
 {
 	spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
 }

 /*
  * Set the DMA buffer enable bits in the mode register.
  */
 static inline void enable_dma_buffer0(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
 }

 static inline void enable_dma_buffer1(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
 }
 static inline void enable_dma_buffers(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_BE0 | DMA_BE1, chan->io + DMA_MODE_SET);
 }

 static inline void start_dma(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_GO, chan->io + DMA_MODE_SET);
 }

 #define DMA_HALT_POLL 0x5000

 static inline void halt_dma(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);
 	int i;

 	if (!chan)
 		return;
 	au_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);

 	/* Poll the halt bit */
 	for (i = 0; i < DMA_HALT_POLL; i++)
 		if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
 			break;
 	if (i == DMA_HALT_POLL)
 		printk(KERN_INFO "halt_dma: HALT poll expired!\n");
 }

 static inline void disable_dma(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;

 	halt_dma(dmanr);

 	/* Now we can disable the buffers */
 	au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
 }

 static inline int dma_halted(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return 1;
 	return (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT) ? 1 : 0;
 }

 /* Initialize a DMA channel. */
 static inline void init_dma(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);
 	u32 mode;

 	if (!chan)
 		return;

 	disable_dma(dmanr);

 	/* Set device FIFO address */
 	au_writel(CPHYSADDR(chan->fifo_addr), chan->io + DMA_PERIPHERAL_ADDR);

 	mode = chan->mode | (chan->dev_id << DMA_DID_BIT);
 	if (chan->irq)
 		mode |= DMA_IE;

 	au_writel(~mode, chan->io + DMA_MODE_CLEAR);
 	au_writel(mode,  chan->io + DMA_MODE_SET);
 }

 /*
  * Set mode for a specific DMA channel
  */
 static inline void set_dma_mode(unsigned int dmanr, unsigned int mode)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	/*
 	 * set_dma_mode is only allowed to change endianess, direction,
 	 * transfer size, device FIFO width, and coherency settings.
 	 * Make sure anything else is masked off.
 	 */
 	mode &= (DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
 	chan->mode &= ~(DMA_BE | DMA_DR | DMA_TS8 | DMA_DW_MASK | DMA_NC);
 	chan->mode |= mode;
 }

 static inline unsigned int get_dma_mode(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return 0;
 	return chan->mode;
 }

 static inline int get_dma_active_buffer(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return -1;
 	return (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ? 1 : 0;
 }

 /*
  * Set the device FIFO address for a specific DMA channel - only
  * applicable to GPO4 and GPO5. All the other devices have fixed
  * FIFO addresses.
  */
 static inline void set_dma_fifo_addr(unsigned int dmanr, unsigned int a)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;

 	if (chan->mode & DMA_DS)	/* second bank of device IDs */
 		return;

 	if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
 		return;

 	au_writel(CPHYSADDR(a), chan->io + DMA_PERIPHERAL_ADDR);
 }

 /*
  * Clear the DMA buffer done bits in the mode register.
  */
 static inline void clear_dma_done0(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
 }

 static inline void clear_dma_done1(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
 }

 /*
  * This does nothing - not applicable to Au1000 DMA.
  */
 static inline void set_dma_page(unsigned int dmanr, char pagenr)
 {
 }

 /*
  * Set Buffer 0 transfer address for specific DMA channel.
  */
 static inline void set_dma_addr0(unsigned int dmanr, unsigned int a)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(a, chan->io + DMA_BUFFER0_START);
 }

 /*
  * Set Buffer 1 transfer address for specific DMA channel.
  */
 static inline void set_dma_addr1(unsigned int dmanr, unsigned int a)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	au_writel(a, chan->io + DMA_BUFFER1_START);
 }


 /*
  * Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
  */
 static inline void set_dma_count0(unsigned int dmanr, unsigned int count)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	count &= DMA_COUNT_MASK;
 	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
 }

 /*
  * Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
  */
 static inline void set_dma_count1(unsigned int dmanr, unsigned int count)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	count &= DMA_COUNT_MASK;
 	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
 }

 /*
  * Set both buffer transfer sizes (max 64k) for a specific DMA channel.
  */
 static inline void set_dma_count(unsigned int dmanr, unsigned int count)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return;
 	count &= DMA_COUNT_MASK;
 	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
 	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
 }

 /*
  * Returns which buffer has its done bit set in the mode register.
  * Returns -1 if neither or both done bits set.
  */
 static inline unsigned int get_dma_buffer_done(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return 0;
 	return au_readl(chan->io + DMA_MODE_READ) & (DMA_D0 | DMA_D1);
 }


 /*
  * Returns the DMA channel's Buffer Done IRQ number.
  */
 static inline int get_dma_done_irq(unsigned int dmanr)
 {
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return -1;
 	return chan->irq;
 }

 /*
  * Get DMA residue count. Returns the number of _bytes_ left to transfer.
  */
 static inline int get_dma_residue(unsigned int dmanr)
 {
 	int curBufCntReg, count;
 	struct dma_chan *chan = get_dma_chan(dmanr);

 	if (!chan)
 		return 0;

 	curBufCntReg = (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ?
 	    DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;

 	count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;

 	if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
 		count <<= 1;
 	else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
 		count <<= 2;

 	return count;
 }

 #endif /* __ASM_AU1000_DMA_H */
	/*
	* BRIEF MODULE DESCRIPTION
	* Defines for using and allocating DMA channels on the Alchemy
	* Au1x00 MIPS processors.
	*
	* Copyright 2000, 2008 MontaVista Software Inc.
	* Author: MontaVista Software, Inc. <source@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.
	*
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
	* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* 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.
	*
	*/
	#ifndef __ASM_AU1000_DMA_H
	#define __ASM_AU1000_DMA_H

	#include <linux/io.h> /* need byte IO */
	#include <linux/spinlock.h> /* And spinlocks */
	#include <linux/delay.h>
	#include <asm/system.h>

	#define NUM_AU1000_DMA_CHANNELS 8

	/* DMA Channel Base Addresses */
	#define DMA_CHANNEL_BASE 0xB4002000
	#define DMA_CHANNEL_LEN 0x00000100

	/* DMA Channel Register Offsets */
	#define DMA_MODE_SET 0x00000000
	#define DMA_MODE_READ DMA_MODE_SET
	#define DMA_MODE_CLEAR 0x00000004
	/* DMA Mode register bits follow */
	#define DMA_DAH_MASK (0x0f << 20)
	#define DMA_DID_BIT 16
	#define DMA_DID_MASK (0x0f << DMA_DID_BIT)
	#define DMA_DS (1 << 15)
	#define DMA_BE (1 << 13)
	#define DMA_DR (1 << 12)
	#define DMA_TS8 (1 << 11)
	#define DMA_DW_BIT 9
	#define DMA_DW_MASK (0x03 << DMA_DW_BIT)
	#define DMA_DW8 (0 << DMA_DW_BIT)
	#define DMA_DW16 (1 << DMA_DW_BIT)
	#define DMA_DW32 (2 << DMA_DW_BIT)
	#define DMA_NC (1 << 8)
	#define DMA_IE (1 << 7)
	#define DMA_HALT (1 << 6)
	#define DMA_GO (1 << 5)
	#define DMA_AB (1 << 4)
	#define DMA_D1 (1 << 3)
	#define DMA_BE1 (1 << 2)
	#define DMA_D0 (1 << 1)
	#define DMA_BE0 (1 << 0)

	#define DMA_PERIPHERAL_ADDR 0x00000008
	#define DMA_BUFFER0_START 0x0000000C
	#define DMA_BUFFER1_START 0x00000014
	#define DMA_BUFFER0_COUNT 0x00000010
	#define DMA_BUFFER1_COUNT 0x00000018
	#define DMA_BAH_BIT 16
	#define DMA_BAH_MASK (0x0f << DMA_BAH_BIT)
	#define DMA_COUNT_BIT 0
	#define DMA_COUNT_MASK (0xffff << DMA_COUNT_BIT)

	/* DMA Device IDs follow */
	enum {
	DMA_ID_UART0_TX = 0,
	DMA_ID_UART0_RX,
	DMA_ID_GP04,
	DMA_ID_GP05,
	DMA_ID_AC97C_TX,
	DMA_ID_AC97C_RX,
	DMA_ID_UART3_TX,
	DMA_ID_UART3_RX,
	DMA_ID_USBDEV_EP0_RX,
	DMA_ID_USBDEV_EP0_TX,
	DMA_ID_USBDEV_EP2_TX,
	DMA_ID_USBDEV_EP3_TX,
	DMA_ID_USBDEV_EP4_RX,
	DMA_ID_USBDEV_EP5_RX,
	DMA_ID_I2S_TX,
	DMA_ID_I2S_RX,
	DMA_NUM_DEV
	};

	/* DMA Device ID's for 2nd bank (AU1100) follow */
	enum {
	DMA_ID_SD0_TX = 0,
	DMA_ID_SD0_RX,
	DMA_ID_SD1_TX,
	DMA_ID_SD1_RX,
	DMA_NUM_DEV_BANK2
	};

	struct dma_chan {
	int dev_id; /* this channel is allocated if >= 0, */
	/* free otherwise */
	unsigned int io;
	const char *dev_str;
	int irq;
	void *irq_dev;
	unsigned int fifo_addr;
	unsigned int mode;
	};

	/* These are in arch/mips/au1000/common/dma.c */
	extern struct dma_chan au1000_dma_table[];
	extern int request_au1000_dma(int dev_id,
	const char *dev_str,
	irq_handler_t irqhandler,
	unsigned long irqflags,
	void *irq_dev_id);
	extern void free_au1000_dma(unsigned int dmanr);
	extern int au1000_dma_read_proc(char buf, char *start, off_t fpos,
	int length, int eof, void data);
	extern void dump_au1000_dma_channel(unsigned int dmanr);
	extern spinlock_t au1000_dma_spin_lock;

	static inline struct dma_chan *get_dma_chan(unsigned int dmanr)
	{
	if (dmanr >= NUM_AU1000_DMA_CHANNELS \|\|
	au1000_dma_table[dmanr].dev_id < 0)
	return NULL;
	return &au1000_dma_table[dmanr];
	}

	static inline unsigned long claim_dma_lock(void)
	{
	unsigned long flags;

	spin_lock_irqsave(&au1000_dma_spin_lock, flags);
	return flags;
	}

	static inline void release_dma_lock(unsigned long flags)
	{
	spin_unlock_irqrestore(&au1000_dma_spin_lock, flags);
	}

	/*
	* Set the DMA buffer enable bits in the mode register.
	*/
	static inline void enable_dma_buffer0(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_BE0, chan->io + DMA_MODE_SET);
	}

	static inline void enable_dma_buffer1(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_BE1, chan->io + DMA_MODE_SET);
	}
	static inline void enable_dma_buffers(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_BE0 \| DMA_BE1, chan->io + DMA_MODE_SET);
	}

	static inline void start_dma(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_GO, chan->io + DMA_MODE_SET);
	}

	#define DMA_HALT_POLL 0x5000

	static inline void halt_dma(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);
	int i;

	if (!chan)
	return;
	au_writel(DMA_GO, chan->io + DMA_MODE_CLEAR);

	/* Poll the halt bit */
	for (i = 0; i < DMA_HALT_POLL; i++)
	if (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT)
	break;
	if (i == DMA_HALT_POLL)
	printk(KERN_INFO "halt_dma: HALT poll expired!\n");
	}

	static inline void disable_dma(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;

	halt_dma(dmanr);

	/* Now we can disable the buffers */
	au_writel(~DMA_GO, chan->io + DMA_MODE_CLEAR);
	}

	static inline int dma_halted(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return 1;
	return (au_readl(chan->io + DMA_MODE_READ) & DMA_HALT) ? 1 : 0;
	}

	/* Initialize a DMA channel. */
	static inline void init_dma(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);
	u32 mode;

	if (!chan)
	return;

	disable_dma(dmanr);

	/* Set device FIFO address */
	au_writel(CPHYSADDR(chan->fifo_addr), chan->io + DMA_PERIPHERAL_ADDR);

	mode = chan->mode \| (chan->dev_id << DMA_DID_BIT);
	if (chan->irq)
	mode \|= DMA_IE;

	au_writel(~mode, chan->io + DMA_MODE_CLEAR);
	au_writel(mode, chan->io + DMA_MODE_SET);
	}

	/*
	* Set mode for a specific DMA channel
	*/
	static inline void set_dma_mode(unsigned int dmanr, unsigned int mode)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	/*
	* set_dma_mode is only allowed to change endianess, direction,
	* transfer size, device FIFO width, and coherency settings.
	* Make sure anything else is masked off.
	*/
	mode &= (DMA_BE \| DMA_DR \| DMA_TS8 \| DMA_DW_MASK \| DMA_NC);
	chan->mode &= ~(DMA_BE \| DMA_DR \| DMA_TS8 \| DMA_DW_MASK \| DMA_NC);
	chan->mode \|= mode;
	}

	static inline unsigned int get_dma_mode(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return 0;
	return chan->mode;
	}

	static inline int get_dma_active_buffer(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return -1;
	return (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ? 1 : 0;
	}

	/*
	* Set the device FIFO address for a specific DMA channel - only
	* applicable to GPO4 and GPO5. All the other devices have fixed
	* FIFO addresses.
	*/
	static inline void set_dma_fifo_addr(unsigned int dmanr, unsigned int a)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;

	if (chan->mode & DMA_DS) /* second bank of device IDs */
	return;

	if (chan->dev_id != DMA_ID_GP04 && chan->dev_id != DMA_ID_GP05)
	return;

	au_writel(CPHYSADDR(a), chan->io + DMA_PERIPHERAL_ADDR);
	}

	/*
	* Clear the DMA buffer done bits in the mode register.
	*/
	static inline void clear_dma_done0(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_D0, chan->io + DMA_MODE_CLEAR);
	}

	static inline void clear_dma_done1(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(DMA_D1, chan->io + DMA_MODE_CLEAR);
	}

	/*
	* This does nothing - not applicable to Au1000 DMA.
	*/
	static inline void set_dma_page(unsigned int dmanr, char pagenr)
	{
	}

	/*
	* Set Buffer 0 transfer address for specific DMA channel.
	*/
	static inline void set_dma_addr0(unsigned int dmanr, unsigned int a)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(a, chan->io + DMA_BUFFER0_START);
	}

	/*
	* Set Buffer 1 transfer address for specific DMA channel.
	*/
	static inline void set_dma_addr1(unsigned int dmanr, unsigned int a)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	au_writel(a, chan->io + DMA_BUFFER1_START);
	}


	/*
	* Set Buffer 0 transfer size (max 64k) for a specific DMA channel.
	*/
	static inline void set_dma_count0(unsigned int dmanr, unsigned int count)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	count &= DMA_COUNT_MASK;
	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
	}

	/*
	* Set Buffer 1 transfer size (max 64k) for a specific DMA channel.
	*/
	static inline void set_dma_count1(unsigned int dmanr, unsigned int count)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	count &= DMA_COUNT_MASK;
	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
	}

	/*
	* Set both buffer transfer sizes (max 64k) for a specific DMA channel.
	*/
	static inline void set_dma_count(unsigned int dmanr, unsigned int count)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return;
	count &= DMA_COUNT_MASK;
	au_writel(count, chan->io + DMA_BUFFER0_COUNT);
	au_writel(count, chan->io + DMA_BUFFER1_COUNT);
	}

	/*
	* Returns which buffer has its done bit set in the mode register.
	* Returns -1 if neither or both done bits set.
	*/
	static inline unsigned int get_dma_buffer_done(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return 0;
	return au_readl(chan->io + DMA_MODE_READ) & (DMA_D0 \| DMA_D1);
	}


	/*
	* Returns the DMA channel's Buffer Done IRQ number.
	*/
	static inline int get_dma_done_irq(unsigned int dmanr)
	{
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return -1;
	return chan->irq;
	}

	/*
	* Get DMA residue count. Returns the number of _bytes_ left to transfer.
	*/
	static inline int get_dma_residue(unsigned int dmanr)
	{
	int curBufCntReg, count;
	struct dma_chan *chan = get_dma_chan(dmanr);

	if (!chan)
	return 0;

	curBufCntReg = (au_readl(chan->io + DMA_MODE_READ) & DMA_AB) ?
	DMA_BUFFER1_COUNT : DMA_BUFFER0_COUNT;

	count = au_readl(chan->io + curBufCntReg) & DMA_COUNT_MASK;

	if ((chan->mode & DMA_DW_MASK) == DMA_DW16)
	count <<= 1;
	else if ((chan->mode & DMA_DW_MASK) == DMA_DW32)
	count <<= 2;

	return count;
	}

	#endif /* __ASM_AU1000_DMA_H */