arch/sh/drivers/dma/dma-sh.c - arm/linux - Git at Google

 /*
  * arch/sh/drivers/dma/dma-sh.c
  *
  * SuperH On-chip DMAC Support
  *
  * Copyright (C) 2000 Takashi YOSHII
  * Copyright (C) 2003, 2004 Paul Mundt
  * Copyright (C) 2005 Andriy Skulysh
  *
  * 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/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/io.h>
 #include <mach-dreamcast/mach/dma.h>
 #include <asm/dma.h>
 #include <asm/dma-register.h>
 #include <cpu/dma-register.h>
 #include <cpu/dma.h>

 /*
  * Define the default configuration for dual address memory-memory transfer.
  * The 0x400 value represents auto-request, external->external.
  */
 #define RS_DUAL	(DM_INC | SM_INC | RS_AUTO | TS_INDEX2VAL(XMIT_SZ_32BIT))

 static unsigned long dma_find_base(unsigned int chan)
 {
 	unsigned long base = SH_DMAC_BASE0;

 #ifdef SH_DMAC_BASE1
 	if (chan >= 6)
 		base = SH_DMAC_BASE1;
 #endif

 	return base;
 }

 static unsigned long dma_base_addr(unsigned int chan)
 {
 	unsigned long base = dma_find_base(chan);

 	/* Normalize offset calculation */
 	if (chan >= 9)
 		chan -= 6;
 	if (chan >= 4)
 		base += 0x10;

 	return base + (chan * 0x10);
 }

 #ifdef CONFIG_SH_DMA_IRQ_MULTI
 static inline unsigned int get_dmte_irq(unsigned int chan)
 {
 	return chan >= 6 ? DMTE6_IRQ : DMTE0_IRQ;
 }
 #else

 static unsigned int dmte_irq_map[] = {
 	DMTE0_IRQ, DMTE0_IRQ + 1, DMTE0_IRQ + 2, DMTE0_IRQ + 3,

 #ifdef DMTE4_IRQ
 	DMTE4_IRQ, DMTE4_IRQ + 1,
 #endif

 #ifdef DMTE6_IRQ
 	DMTE6_IRQ, DMTE6_IRQ + 1,
 #endif

 #ifdef DMTE8_IRQ
 	DMTE8_IRQ, DMTE9_IRQ, DMTE10_IRQ, DMTE11_IRQ,
 #endif
 };

 static inline unsigned int get_dmte_irq(unsigned int chan)
 {
 	return dmte_irq_map[chan];
 }
 #endif

 /*
  * We determine the correct shift size based off of the CHCR transmit size
  * for the given channel. Since we know that it will take:
  *
  *	info->count >> ts_shift[transmit_size]
  *
  * iterations to complete the transfer.
  */
 static unsigned int ts_shift[] = TS_SHIFT;

 static inline unsigned int calc_xmit_shift(struct dma_channel *chan)
 {
 	u32 chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
 	int cnt = ((chcr & CHCR_TS_LOW_MASK) >> CHCR_TS_LOW_SHIFT) |
 		((chcr & CHCR_TS_HIGH_MASK) >> CHCR_TS_HIGH_SHIFT);

 	return ts_shift[cnt];
 }

 /*
  * The transfer end interrupt must read the chcr register to end the
  * hardware interrupt active condition.
  * Besides that it needs to waken any waiting process, which should handle
  * setting up the next transfer.
  */
 static irqreturn_t dma_tei(int irq, void *dev_id)
 {
 	struct dma_channel *chan = dev_id;
 	u32 chcr;

 	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);

 	if (!(chcr & CHCR_TE))
 		return IRQ_NONE;

 	chcr &= ~(CHCR_IE | CHCR_DE);
 	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

 	wake_up(&chan->wait_queue);

 	return IRQ_HANDLED;
 }

 static int sh_dmac_request_dma(struct dma_channel *chan)
 {
 	if (unlikely(!(chan->flags & DMA_TEI_CAPABLE)))
 		return 0;

 	return request_irq(get_dmte_irq(chan->chan), dma_tei, IRQF_SHARED,
 			   chan->dev_id, chan);
 }

 static void sh_dmac_free_dma(struct dma_channel *chan)
 {
 	free_irq(get_dmte_irq(chan->chan), chan);
 }

 static int
 sh_dmac_configure_channel(struct dma_channel *chan, unsigned long chcr)
 {
 	if (!chcr)
 		chcr = RS_DUAL | CHCR_IE;

 	if (chcr & CHCR_IE) {
 		chcr &= ~CHCR_IE;
 		chan->flags |= DMA_TEI_CAPABLE;
 	} else {
 		chan->flags &= ~DMA_TEI_CAPABLE;
 	}

 	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

 	chan->flags |= DMA_CONFIGURED;
 	return 0;
 }

 static void sh_dmac_enable_dma(struct dma_channel *chan)
 {
 	int irq;
 	u32 chcr;

 	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
 	chcr |= CHCR_DE;

 	if (chan->flags & DMA_TEI_CAPABLE)
 		chcr |= CHCR_IE;

 	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

 	if (chan->flags & DMA_TEI_CAPABLE) {
 		irq = get_dmte_irq(chan->chan);
 		enable_irq(irq);
 	}
 }

 static void sh_dmac_disable_dma(struct dma_channel *chan)
 {
 	int irq;
 	u32 chcr;

 	if (chan->flags & DMA_TEI_CAPABLE) {
 		irq = get_dmte_irq(chan->chan);
 		disable_irq(irq);
 	}

 	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
 	chcr &= ~(CHCR_DE | CHCR_TE | CHCR_IE);
 	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));
 }

 static int sh_dmac_xfer_dma(struct dma_channel *chan)
 {
 	/*
 	 * If we haven't pre-configured the channel with special flags, use
 	 * the defaults.
 	 */
 	if (unlikely(!(chan->flags & DMA_CONFIGURED)))
 		sh_dmac_configure_channel(chan, 0);

 	sh_dmac_disable_dma(chan);

 	/*
 	 * Single-address mode usage note!
 	 *
 	 * It's important that we don't accidentally write any value to SAR/DAR
 	 * (this includes 0) that hasn't been directly specified by the user if
 	 * we're in single-address mode.
 	 *
 	 * In this case, only one address can be defined, anything else will
 	 * result in a DMA address error interrupt (at least on the SH-4),
 	 * which will subsequently halt the transfer.
 	 *
 	 * Channel 2 on the Dreamcast is a special case, as this is used for
 	 * cascading to the PVR2 DMAC. In this case, we still need to write
 	 * SAR and DAR, regardless of value, in order for cascading to work.
 	 */
 	if (chan->sar || (mach_is_dreamcast() &&
 			  chan->chan == PVR2_CASCADE_CHAN))
 		__raw_writel(chan->sar, (dma_base_addr(chan->chan) + SAR));
 	if (chan->dar || (mach_is_dreamcast() &&
 			  chan->chan == PVR2_CASCADE_CHAN))
 		__raw_writel(chan->dar, (dma_base_addr(chan->chan) + DAR));

 	__raw_writel(chan->count >> calc_xmit_shift(chan),
 		(dma_base_addr(chan->chan) + TCR));

 	sh_dmac_enable_dma(chan);

 	return 0;
 }

 static int sh_dmac_get_dma_residue(struct dma_channel *chan)
 {
 	if (!(__raw_readl(dma_base_addr(chan->chan) + CHCR) & CHCR_DE))
 		return 0;

 	return __raw_readl(dma_base_addr(chan->chan) + TCR)
 		 << calc_xmit_shift(chan);
 }

 /*
  * DMAOR handling
  */
 #if defined(CONFIG_CPU_SUBTYPE_SH7723)	|| \
     defined(CONFIG_CPU_SUBTYPE_SH7724)	|| \
     defined(CONFIG_CPU_SUBTYPE_SH7780)	|| \
     defined(CONFIG_CPU_SUBTYPE_SH7785)
 #define NR_DMAOR	2
 #else
 #define NR_DMAOR	1
 #endif

 /*
  * DMAOR bases are broken out amongst channel groups. DMAOR0 manages
  * channels 0 - 5, DMAOR1 6 - 11 (optional).
  */
 #define dmaor_read_reg(n)		__raw_readw(dma_find_base((n)*6))
 #define dmaor_write_reg(n, data)	__raw_writew(data, dma_find_base(n)*6)

 static inline int dmaor_reset(int no)
 {
 	unsigned long dmaor = dmaor_read_reg(no);

 	/* Try to clear the error flags first, incase they are set */
 	dmaor &= ~(DMAOR_NMIF | DMAOR_AE);
 	dmaor_write_reg(no, dmaor);

 	dmaor |= DMAOR_INIT;
 	dmaor_write_reg(no, dmaor);

 	/* See if we got an error again */
 	if ((dmaor_read_reg(no) & (DMAOR_AE | DMAOR_NMIF))) {
 		printk(KERN_ERR "dma-sh: Can't initialize DMAOR.\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 /*
  * DMAE handling
  */
 #ifdef CONFIG_CPU_SH4

 #if defined(DMAE1_IRQ)
 #define NR_DMAE		2
 #else
 #define NR_DMAE		1
 #endif

 static const char *dmae_name[] = {
 	"DMAC Address Error0",
 	"DMAC Address Error1"
 };

 #ifdef CONFIG_SH_DMA_IRQ_MULTI
 static inline unsigned int get_dma_error_irq(int n)
 {
 	return get_dmte_irq(n * 6);
 }
 #else

 static unsigned int dmae_irq_map[] = {
 	DMAE0_IRQ,

 #ifdef DMAE1_IRQ
 	DMAE1_IRQ,
 #endif
 };

 static inline unsigned int get_dma_error_irq(int n)
 {
 	return dmae_irq_map[n];
 }
 #endif

 static irqreturn_t dma_err(int irq, void *dummy)
 {
 	int i;

 	for (i = 0; i < NR_DMAOR; i++)
 		dmaor_reset(i);

 	disable_irq(irq);

 	return IRQ_HANDLED;
 }

 static int dmae_irq_init(void)
 {
 	int n;

 	for (n = 0; n < NR_DMAE; n++) {
 		int i = request_irq(get_dma_error_irq(n), dma_err,
 				    IRQF_SHARED, dmae_name[n], (void *)dmae_name[n]);
 		if (unlikely(i < 0)) {
 			printk(KERN_ERR "%s request_irq fail\n", dmae_name[n]);
 			return i;
 		}
 	}

 	return 0;
 }

 static void dmae_irq_free(void)
 {
 	int n;

 	for (n = 0; n < NR_DMAE; n++)
 		free_irq(get_dma_error_irq(n), NULL);
 }
 #else
 static inline int dmae_irq_init(void)
 {
 	return 0;
 }

 static void dmae_irq_free(void)
 {
 }
 #endif

 static struct dma_ops sh_dmac_ops = {
 	.request	= sh_dmac_request_dma,
 	.free		= sh_dmac_free_dma,
 	.get_residue	= sh_dmac_get_dma_residue,
 	.xfer		= sh_dmac_xfer_dma,
 	.configure	= sh_dmac_configure_channel,
 };

 static struct dma_info sh_dmac_info = {
 	.name		= "sh_dmac",
 	.nr_channels	= CONFIG_NR_ONCHIP_DMA_CHANNELS,
 	.ops		= &sh_dmac_ops,
 	.flags		= DMAC_CHANNELS_TEI_CAPABLE,
 };

 static int __init sh_dmac_init(void)
 {
 	struct dma_info *info = &sh_dmac_info;
 	int i, rc;

 	/*
 	 * Initialize DMAE, for parts that support it.
 	 */
 	rc = dmae_irq_init();
 	if (unlikely(rc != 0))
 		return rc;

 	/*
 	 * Initialize DMAOR, and clean up any error flags that may have
 	 * been set.
 	 */
 	for (i = 0; i < NR_DMAOR; i++) {
 		rc = dmaor_reset(i);
 		if (unlikely(rc != 0))
 			return rc;
 	}

 	return register_dmac(info);
 }

 static void __exit sh_dmac_exit(void)
 {
 	dmae_irq_free();
 	unregister_dmac(&sh_dmac_info);
 }

 subsys_initcall(sh_dmac_init);
 module_exit(sh_dmac_exit);

 MODULE_AUTHOR("Takashi YOSHII, Paul Mundt, Andriy Skulysh");
 MODULE_DESCRIPTION("SuperH On-Chip DMAC Support");
 MODULE_LICENSE("GPL");
	/*
	* arch/sh/drivers/dma/dma-sh.c
	*
	* SuperH On-chip DMAC Support
	*
	* Copyright (C) 2000 Takashi YOSHII
	* Copyright (C) 2003, 2004 Paul Mundt
	* Copyright (C) 2005 Andriy Skulysh
	*
	* 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/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/io.h>
	#include <mach-dreamcast/mach/dma.h>
	#include <asm/dma.h>
	#include <asm/dma-register.h>
	#include <cpu/dma-register.h>
	#include <cpu/dma.h>

	/*
	* Define the default configuration for dual address memory-memory transfer.
	* The 0x400 value represents auto-request, external->external.
	*/
	#define RS_DUAL (DM_INC \| SM_INC \| RS_AUTO \| TS_INDEX2VAL(XMIT_SZ_32BIT))

	static unsigned long dma_find_base(unsigned int chan)
	{
	unsigned long base = SH_DMAC_BASE0;

	#ifdef SH_DMAC_BASE1
	if (chan >= 6)
	base = SH_DMAC_BASE1;
	#endif

	return base;
	}

	static unsigned long dma_base_addr(unsigned int chan)
	{
	unsigned long base = dma_find_base(chan);

	/* Normalize offset calculation */
	if (chan >= 9)
	chan -= 6;
	if (chan >= 4)
	base += 0x10;

	return base + (chan * 0x10);
	}

	#ifdef CONFIG_SH_DMA_IRQ_MULTI
	static inline unsigned int get_dmte_irq(unsigned int chan)
	{
	return chan >= 6 ? DMTE6_IRQ : DMTE0_IRQ;
	}
	#else

	static unsigned int dmte_irq_map[] = {
	DMTE0_IRQ, DMTE0_IRQ + 1, DMTE0_IRQ + 2, DMTE0_IRQ + 3,

	#ifdef DMTE4_IRQ
	DMTE4_IRQ, DMTE4_IRQ + 1,
	#endif

	#ifdef DMTE6_IRQ
	DMTE6_IRQ, DMTE6_IRQ + 1,
	#endif

	#ifdef DMTE8_IRQ
	DMTE8_IRQ, DMTE9_IRQ, DMTE10_IRQ, DMTE11_IRQ,
	#endif
	};

	static inline unsigned int get_dmte_irq(unsigned int chan)
	{
	return dmte_irq_map[chan];
	}
	#endif

	/*
	* We determine the correct shift size based off of the CHCR transmit size
	* for the given channel. Since we know that it will take:
	*
	* info->count >> ts_shift[transmit_size]
	*
	* iterations to complete the transfer.
	*/
	static unsigned int ts_shift[] = TS_SHIFT;

	static inline unsigned int calc_xmit_shift(struct dma_channel *chan)
	{
	u32 chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
	int cnt = ((chcr & CHCR_TS_LOW_MASK) >> CHCR_TS_LOW_SHIFT) \|
	((chcr & CHCR_TS_HIGH_MASK) >> CHCR_TS_HIGH_SHIFT);

	return ts_shift[cnt];
	}

	/*
	* The transfer end interrupt must read the chcr register to end the
	* hardware interrupt active condition.
	* Besides that it needs to waken any waiting process, which should handle
	* setting up the next transfer.
	*/
	static irqreturn_t dma_tei(int irq, void *dev_id)
	{
	struct dma_channel *chan = dev_id;
	u32 chcr;

	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);

	if (!(chcr & CHCR_TE))
	return IRQ_NONE;

	chcr &= ~(CHCR_IE \| CHCR_DE);
	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

	wake_up(&chan->wait_queue);

	return IRQ_HANDLED;
	}

	static int sh_dmac_request_dma(struct dma_channel *chan)
	{
	if (unlikely(!(chan->flags & DMA_TEI_CAPABLE)))
	return 0;

	return request_irq(get_dmte_irq(chan->chan), dma_tei, IRQF_SHARED,
	chan->dev_id, chan);
	}

	static void sh_dmac_free_dma(struct dma_channel *chan)
	{
	free_irq(get_dmte_irq(chan->chan), chan);
	}

	static int
	sh_dmac_configure_channel(struct dma_channel *chan, unsigned long chcr)
	{
	if (!chcr)
	chcr = RS_DUAL \| CHCR_IE;

	if (chcr & CHCR_IE) {
	chcr &= ~CHCR_IE;
	chan->flags \|= DMA_TEI_CAPABLE;
	} else {
	chan->flags &= ~DMA_TEI_CAPABLE;
	}

	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

	chan->flags \|= DMA_CONFIGURED;
	return 0;
	}

	static void sh_dmac_enable_dma(struct dma_channel *chan)
	{
	int irq;
	u32 chcr;

	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
	chcr \|= CHCR_DE;

	if (chan->flags & DMA_TEI_CAPABLE)
	chcr \|= CHCR_IE;

	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));

	if (chan->flags & DMA_TEI_CAPABLE) {
	irq = get_dmte_irq(chan->chan);
	enable_irq(irq);
	}
	}

	static void sh_dmac_disable_dma(struct dma_channel *chan)
	{
	int irq;
	u32 chcr;

	if (chan->flags & DMA_TEI_CAPABLE) {
	irq = get_dmte_irq(chan->chan);
	disable_irq(irq);
	}

	chcr = __raw_readl(dma_base_addr(chan->chan) + CHCR);
	chcr &= ~(CHCR_DE \| CHCR_TE \| CHCR_IE);
	__raw_writel(chcr, (dma_base_addr(chan->chan) + CHCR));
	}

	static int sh_dmac_xfer_dma(struct dma_channel *chan)
	{
	/*
	* If we haven't pre-configured the channel with special flags, use
	* the defaults.
	*/
	if (unlikely(!(chan->flags & DMA_CONFIGURED)))
	sh_dmac_configure_channel(chan, 0);

	sh_dmac_disable_dma(chan);

	/*
	* Single-address mode usage note!
	*
	* It's important that we don't accidentally write any value to SAR/DAR
	* (this includes 0) that hasn't been directly specified by the user if
	* we're in single-address mode.
	*
	* In this case, only one address can be defined, anything else will
	* result in a DMA address error interrupt (at least on the SH-4),
	* which will subsequently halt the transfer.
	*
	* Channel 2 on the Dreamcast is a special case, as this is used for
	* cascading to the PVR2 DMAC. In this case, we still need to write
	* SAR and DAR, regardless of value, in order for cascading to work.
	*/
	if (chan->sar \|\| (mach_is_dreamcast() &&
	chan->chan == PVR2_CASCADE_CHAN))
	__raw_writel(chan->sar, (dma_base_addr(chan->chan) + SAR));
	if (chan->dar \|\| (mach_is_dreamcast() &&
	chan->chan == PVR2_CASCADE_CHAN))
	__raw_writel(chan->dar, (dma_base_addr(chan->chan) + DAR));

	__raw_writel(chan->count >> calc_xmit_shift(chan),
	(dma_base_addr(chan->chan) + TCR));

	sh_dmac_enable_dma(chan);

	return 0;
	}

	static int sh_dmac_get_dma_residue(struct dma_channel *chan)
	{
	if (!(__raw_readl(dma_base_addr(chan->chan) + CHCR) & CHCR_DE))
	return 0;

	return __raw_readl(dma_base_addr(chan->chan) + TCR)
	<< calc_xmit_shift(chan);
	}

	/*
	* DMAOR handling
	*/
	#if defined(CONFIG_CPU_SUBTYPE_SH7723) \|\| \
	defined(CONFIG_CPU_SUBTYPE_SH7724) \|\| \
	defined(CONFIG_CPU_SUBTYPE_SH7780) \|\| \
	defined(CONFIG_CPU_SUBTYPE_SH7785)
	#define NR_DMAOR 2
	#else
	#define NR_DMAOR 1
	#endif

	/*
	* DMAOR bases are broken out amongst channel groups. DMAOR0 manages
	* channels 0 - 5, DMAOR1 6 - 11 (optional).
	*/
	#define dmaor_read_reg(n) __raw_readw(dma_find_base((n)*6))
	#define dmaor_write_reg(n, data) __raw_writew(data, dma_find_base(n)*6)

	static inline int dmaor_reset(int no)
	{
	unsigned long dmaor = dmaor_read_reg(no);

	/* Try to clear the error flags first, incase they are set */
	dmaor &= ~(DMAOR_NMIF \| DMAOR_AE);
	dmaor_write_reg(no, dmaor);

	dmaor \|= DMAOR_INIT;
	dmaor_write_reg(no, dmaor);

	/* See if we got an error again */
	if ((dmaor_read_reg(no) & (DMAOR_AE \| DMAOR_NMIF))) {
	printk(KERN_ERR "dma-sh: Can't initialize DMAOR.\n");
	return -EINVAL;
	}

	return 0;
	}

	/*
	* DMAE handling
	*/
	#ifdef CONFIG_CPU_SH4

	#if defined(DMAE1_IRQ)
	#define NR_DMAE 2
	#else
	#define NR_DMAE 1
	#endif

	static const char *dmae_name[] = {
	"DMAC Address Error0",
	"DMAC Address Error1"
	};

	#ifdef CONFIG_SH_DMA_IRQ_MULTI
	static inline unsigned int get_dma_error_irq(int n)
	{
	return get_dmte_irq(n * 6);
	}
	#else

	static unsigned int dmae_irq_map[] = {
	DMAE0_IRQ,

	#ifdef DMAE1_IRQ
	DMAE1_IRQ,
	#endif
	};

	static inline unsigned int get_dma_error_irq(int n)
	{
	return dmae_irq_map[n];
	}
	#endif

	static irqreturn_t dma_err(int irq, void *dummy)
	{
	int i;

	for (i = 0; i < NR_DMAOR; i++)
	dmaor_reset(i);

	disable_irq(irq);

	return IRQ_HANDLED;
	}

	static int dmae_irq_init(void)
	{
	int n;

	for (n = 0; n < NR_DMAE; n++) {
	int i = request_irq(get_dma_error_irq(n), dma_err,
	IRQF_SHARED, dmae_name[n], (void *)dmae_name[n]);
	if (unlikely(i < 0)) {
	printk(KERN_ERR "%s request_irq fail\n", dmae_name[n]);
	return i;
	}
	}

	return 0;
	}

	static void dmae_irq_free(void)
	{
	int n;

	for (n = 0; n < NR_DMAE; n++)
	free_irq(get_dma_error_irq(n), NULL);
	}
	#else
	static inline int dmae_irq_init(void)
	{
	return 0;
	}

	static void dmae_irq_free(void)
	{
	}
	#endif

	static struct dma_ops sh_dmac_ops = {
	.request = sh_dmac_request_dma,
	.free = sh_dmac_free_dma,
	.get_residue = sh_dmac_get_dma_residue,
	.xfer = sh_dmac_xfer_dma,
	.configure = sh_dmac_configure_channel,
	};

	static struct dma_info sh_dmac_info = {
	.name = "sh_dmac",
	.nr_channels = CONFIG_NR_ONCHIP_DMA_CHANNELS,
	.ops = &sh_dmac_ops,
	.flags = DMAC_CHANNELS_TEI_CAPABLE,
	};

	static int __init sh_dmac_init(void)
	{
	struct dma_info *info = &sh_dmac_info;
	int i, rc;

	/*
	* Initialize DMAE, for parts that support it.
	*/
	rc = dmae_irq_init();
	if (unlikely(rc != 0))
	return rc;

	/*
	* Initialize DMAOR, and clean up any error flags that may have
	* been set.
	*/
	for (i = 0; i < NR_DMAOR; i++) {
	rc = dmaor_reset(i);
	if (unlikely(rc != 0))
	return rc;
	}

	return register_dmac(info);
	}

	static void __exit sh_dmac_exit(void)
	{
	dmae_irq_free();
	unregister_dmac(&sh_dmac_info);
	}

	subsys_initcall(sh_dmac_init);
	module_exit(sh_dmac_exit);

	MODULE_AUTHOR("Takashi YOSHII, Paul Mundt, Andriy Skulysh");
	MODULE_DESCRIPTION("SuperH On-Chip DMAC Support");
	MODULE_LICENSE("GPL");