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Commit d167e1f0 authored by Olof Johansson's avatar Olof Johansson
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Merge tag 's3c64xx-dmaengine' of... 

Merge tag 's3c64xx-dmaengine' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc into next/drivers

From Tomasz Figa via Mark Brown:
ARM: s3c64xx: Convert to dmaengine

This series of commits from Tomasz converting s3c64xx to use dmaengine
rather than the old s3c-dma API missed the v3.13 merge window - Kukjin
said that he'd applied it (which should mean it's OK from a review point
of view) but it didn't make it into -next or a pull request.

Since a s3c64xx based system is one of my primary development platforms
it'd be really helpful if I could merge this into both ASoC and SPI,
I've got some patches for ASoC ready to go converting to use dmaengine
directly which help with multiplatform and there's some other dmaengine
work for SPI in progress too.  I've therefore made this signed tag, it'd
be great if it could be merged into both arm-soc and those two trees.

* tag 's3c64xx-dmaengine' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc

:
  spi: s3c64xx: Always select S3C64XX_PL080 when ARCH_S3C64XX is enabled
  clk: samsung: s3c64xx: Remove clock aliases of old DMA driver
  ARM: s3c64xx: Remove legacy DMA driver
  clk: samsung: s3c64xx: Add aliases for DMA clocks
  ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver
  spi: s3c64xx: Do not require legacy DMA API in case of S3C64XX

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parents 5c748225 3faecea7

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -723,6 +723,7 @@ config ARCH_S3C64XX 
	bool "Samsung S3C64XX"

	select ARCH_HAS_CPUFREQ

	select ARCH_REQUIRE_GPIOLIB

	select ARM_AMBA

	select ARM_VIC

	select CLKDEV_LOOKUP

	select CLKSRC_SAMSUNG_PWM

arch/arm/mach-s3c64xx/Kconfig

+4 −3
Original line number Diff line number Diff line
@@ -17,9 +17,10 @@ config CPU_S3C6410 
	help

	  Enable S3C6410 CPU support



config S3C64XX_DMA

	bool "S3C64XX DMA"

	select S3C_DMA

config S3C64XX_PL080

	bool "S3C64XX DMA using generic PL08x driver"

	select AMBA_PL08X

	select SAMSUNG_DMADEV



config S3C64XX_SETUP_SDHCI

	bool

arch/arm/mach-s3c64xx/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o 


# DMA support



obj-$(CONFIG_S3C64XX_DMA)	+= dma.o

obj-$(CONFIG_S3C64XX_PL080)	+= pl080.o



# Device support

arch/arm/mach-s3c64xx/common.h

+5 −0
Original line number Diff line number Diff line
@@ -58,4 +58,9 @@ int __init s3c64xx_pm_late_initcall(void); 
static inline int s3c64xx_pm_late_initcall(void) { return 0; }

#endif



#ifdef CONFIG_S3C64XX_PL080

extern struct pl08x_platform_data s3c64xx_dma0_plat_data;

extern struct pl08x_platform_data s3c64xx_dma1_plat_data;

#endif



#endif /* __ARCH_ARM_MACH_S3C64XX_COMMON_H */

arch/arm/mach-s3c64xx/dma.c

deleted100644 → 0
+0 −762
Original line number Diff line number Diff line 
/* linux/arch/arm/plat-s3c64xx/dma.c

 *

 * Copyright 2009 Openmoko, Inc.

 * Copyright 2009 Simtec Electronics

 *	Ben Dooks <ben@simtec.co.uk>

 *	http://armlinux.simtec.co.uk/

 *

 * S3C64XX DMA core

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

*/



/*

 * NOTE: Code in this file is not used when booting with Device Tree support.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/dmapool.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/amba/pl080.h>

#include <linux/of.h>



#include <mach/dma.h>

#include <mach/map.h>

#include <mach/irqs.h>



#include "regs-sys.h"



/* dma channel state information */



struct s3c64xx_dmac {

	struct device		dev;

	struct clk		*clk;

	void __iomem		*regs;

	struct s3c2410_dma_chan *channels;

	enum dma_ch		 chanbase;

};



/* pool to provide LLI buffers */

static struct dma_pool *dma_pool;



/* Debug configuration and code */



static unsigned char debug_show_buffs = 0;



static void dbg_showchan(struct s3c2410_dma_chan *chan)

{

	pr_debug("DMA%d: %08x->%08x L %08x C %08x,%08x S %08x\n",

		 chan->number,

		 readl(chan->regs + PL080_CH_SRC_ADDR),

		 readl(chan->regs + PL080_CH_DST_ADDR),

		 readl(chan->regs + PL080_CH_LLI),

		 readl(chan->regs + PL080_CH_CONTROL),

		 readl(chan->regs + PL080S_CH_CONTROL2),

		 readl(chan->regs + PL080S_CH_CONFIG));

}



static void show_lli(struct pl080s_lli *lli)

{

	pr_debug("LLI[%p] %08x->%08x, NL %08x C %08x,%08x\n",

		 lli, lli->src_addr, lli->dst_addr, lli->next_lli,

		 lli->control0, lli->control1);

}



static void dbg_showbuffs(struct s3c2410_dma_chan *chan)

{

	struct s3c64xx_dma_buff *ptr;

	struct s3c64xx_dma_buff *end;



	pr_debug("DMA%d: buffs next %p, curr %p, end %p\n",

		 chan->number, chan->next, chan->curr, chan->end);



	ptr = chan->next;

	end = chan->end;



	if (debug_show_buffs) {

		for (; ptr != NULL; ptr = ptr->next) {

			pr_debug("DMA%d: %08x ",

				 chan->number, ptr->lli_dma);

			show_lli(ptr->lli);

		}

	}

}



/* End of Debug */



static struct s3c2410_dma_chan *s3c64xx_dma_map_channel(unsigned int channel)

{

	struct s3c2410_dma_chan *chan;

	unsigned int start, offs;



	start = 0;



	if (channel >= DMACH_PCM1_TX)

		start = 8;



	for (offs = 0; offs < 8; offs++) {

		chan = &s3c2410_chans[start + offs];

		if (!chan->in_use)

			goto found;

	}



	return NULL;



found:

	s3c_dma_chan_map[channel] = chan;

	return chan;

}



int s3c2410_dma_config(enum dma_ch channel, int xferunit)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);



	if (chan == NULL)

		return -EINVAL;



	switch (xferunit) {

	case 1:

		chan->hw_width = 0;

		break;

	case 2:

		chan->hw_width = 1;

		break;

	case 4:

		chan->hw_width = 2;

		break;

	default:

		printk(KERN_ERR "%s: illegal width %d\n", __func__, xferunit);

		return -EINVAL;

	}



	return 0;

}

EXPORT_SYMBOL(s3c2410_dma_config);



static void s3c64xx_dma_fill_lli(struct s3c2410_dma_chan *chan,

				 struct pl080s_lli *lli,

				 dma_addr_t data, int size)

{

	dma_addr_t src, dst;

	u32 control0, control1;



	switch (chan->source) {

	case DMA_FROM_DEVICE:

		src = chan->dev_addr;

		dst = data;

		control0 = PL080_CONTROL_SRC_AHB2;

		control0 |= PL080_CONTROL_DST_INCR;

		break;



	case DMA_TO_DEVICE:

		src = data;

		dst = chan->dev_addr;

		control0 = PL080_CONTROL_DST_AHB2;

		control0 |= PL080_CONTROL_SRC_INCR;

		break;

	default:

		BUG();

	}



	/* note, we do not currently setup any of the burst controls */



	control1 = size >> chan->hw_width;	/* size in no of xfers */

	control0 |= PL080_CONTROL_PROT_SYS;	/* always in priv. mode */

	control0 |= PL080_CONTROL_TC_IRQ_EN;	/* always fire IRQ */

	control0 |= (u32)chan->hw_width << PL080_CONTROL_DWIDTH_SHIFT;

	control0 |= (u32)chan->hw_width << PL080_CONTROL_SWIDTH_SHIFT;



	lli->src_addr = src;

	lli->dst_addr = dst;

	lli->next_lli = 0;

	lli->control0 = control0;

	lli->control1 = control1;

}



static void s3c64xx_lli_to_regs(struct s3c2410_dma_chan *chan,

				struct pl080s_lli *lli)

{

	void __iomem *regs = chan->regs;



	pr_debug("%s: LLI %p => regs\n", __func__, lli);

	show_lli(lli);



	writel(lli->src_addr, regs + PL080_CH_SRC_ADDR);

	writel(lli->dst_addr, regs + PL080_CH_DST_ADDR);

	writel(lli->next_lli, regs + PL080_CH_LLI);

	writel(lli->control0, regs + PL080_CH_CONTROL);

	writel(lli->control1, regs + PL080S_CH_CONTROL2);

}



static int s3c64xx_dma_start(struct s3c2410_dma_chan *chan)

{

	struct s3c64xx_dmac *dmac = chan->dmac;

	u32 config;

	u32 bit = chan->bit;



	dbg_showchan(chan);



	pr_debug("%s: clearing interrupts\n", __func__);



	/* clear interrupts */

	writel(bit, dmac->regs + PL080_TC_CLEAR);

	writel(bit, dmac->regs + PL080_ERR_CLEAR);



	pr_debug("%s: starting channel\n", __func__);



	config = readl(chan->regs + PL080S_CH_CONFIG);

	config |= PL080_CONFIG_ENABLE;

	config &= ~PL080_CONFIG_HALT;



	pr_debug("%s: writing config %08x\n", __func__, config);

	writel(config, chan->regs + PL080S_CH_CONFIG);



	return 0;

}



static int s3c64xx_dma_stop(struct s3c2410_dma_chan *chan)

{

	u32 config;

	int timeout;



	pr_debug("%s: stopping channel\n", __func__);



	dbg_showchan(chan);



	config = readl(chan->regs + PL080S_CH_CONFIG);

	config |= PL080_CONFIG_HALT;

	writel(config, chan->regs + PL080S_CH_CONFIG);



	timeout = 1000;

	do {

		config = readl(chan->regs + PL080S_CH_CONFIG);

		pr_debug("%s: %d - config %08x\n", __func__, timeout, config);

		if (config & PL080_CONFIG_ACTIVE)

			udelay(10);

		else

			break;

		} while (--timeout > 0);



	if (config & PL080_CONFIG_ACTIVE) {

		printk(KERN_ERR "%s: channel still active\n", __func__);

		return -EFAULT;

	}



	config = readl(chan->regs + PL080S_CH_CONFIG);

	config &= ~PL080_CONFIG_ENABLE;

	writel(config, chan->regs + PL080S_CH_CONFIG);



	return 0;

}



static inline void s3c64xx_dma_bufffdone(struct s3c2410_dma_chan *chan,

					 struct s3c64xx_dma_buff *buf,

					 enum s3c2410_dma_buffresult result)

{

	if (chan->callback_fn != NULL)

		(chan->callback_fn)(chan, buf->pw, 0, result);

}



static void s3c64xx_dma_freebuff(struct s3c64xx_dma_buff *buff)

{

	dma_pool_free(dma_pool, buff->lli, buff->lli_dma);

	kfree(buff);

}



static int s3c64xx_dma_flush(struct s3c2410_dma_chan *chan)

{

	struct s3c64xx_dma_buff *buff, *next;

	u32 config;



	dbg_showchan(chan);



	pr_debug("%s: flushing channel\n", __func__);



	config = readl(chan->regs + PL080S_CH_CONFIG);

	config &= ~PL080_CONFIG_ENABLE;

	writel(config, chan->regs + PL080S_CH_CONFIG);



	/* dump all the buffers associated with this channel */



	for (buff = chan->curr; buff != NULL; buff = next) {

		next = buff->next;

		pr_debug("%s: buff %p (next %p)\n", __func__, buff, buff->next);



		s3c64xx_dma_bufffdone(chan, buff, S3C2410_RES_ABORT);

		s3c64xx_dma_freebuff(buff);

	}



	chan->curr = chan->next = chan->end = NULL;



	return 0;

}



int s3c2410_dma_ctrl(enum dma_ch channel, enum s3c2410_chan_op op)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);



	WARN_ON(!chan);

	if (!chan)

		return -EINVAL;



	switch (op) {

	case S3C2410_DMAOP_START:

		return s3c64xx_dma_start(chan);



	case S3C2410_DMAOP_STOP:

		return s3c64xx_dma_stop(chan);



	case S3C2410_DMAOP_FLUSH:

		return s3c64xx_dma_flush(chan);



	/* believe PAUSE/RESUME are no-ops */

	case S3C2410_DMAOP_PAUSE:

	case S3C2410_DMAOP_RESUME:

	case S3C2410_DMAOP_STARTED:

	case S3C2410_DMAOP_TIMEOUT:

		return 0;

	}



	return -ENOENT;

}

EXPORT_SYMBOL(s3c2410_dma_ctrl);



/* s3c2410_dma_enque

 *

 */



int s3c2410_dma_enqueue(enum dma_ch channel, void *id,

			dma_addr_t data, int size)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);

	struct s3c64xx_dma_buff *next;

	struct s3c64xx_dma_buff *buff;

	struct pl080s_lli *lli;

	unsigned long flags;

	int ret;



	WARN_ON(!chan);

	if (!chan)

		return -EINVAL;



	buff = kzalloc(sizeof(struct s3c64xx_dma_buff), GFP_ATOMIC);

	if (!buff) {

		printk(KERN_ERR "%s: no memory for buffer\n", __func__);

		return -ENOMEM;

	}



	lli = dma_pool_alloc(dma_pool, GFP_ATOMIC, &buff->lli_dma);

	if (!lli) {

		printk(KERN_ERR "%s: no memory for lli\n", __func__);

		ret = -ENOMEM;

		goto err_buff;

	}



	pr_debug("%s: buff %p, dp %08x lli (%p, %08x) %d\n",

		 __func__, buff, data, lli, (u32)buff->lli_dma, size);



	buff->lli = lli;

	buff->pw = id;



	s3c64xx_dma_fill_lli(chan, lli, data, size);



	local_irq_save(flags);



	if ((next = chan->next) != NULL) {

		struct s3c64xx_dma_buff *end = chan->end;

		struct pl080s_lli *endlli = end->lli;



		pr_debug("enquing onto channel\n");



		end->next = buff;

		endlli->next_lli = buff->lli_dma;



		if (chan->flags & S3C2410_DMAF_CIRCULAR) {

			struct s3c64xx_dma_buff *curr = chan->curr;

			lli->next_lli = curr->lli_dma;

		}



		if (next == chan->curr) {

			writel(buff->lli_dma, chan->regs + PL080_CH_LLI);

			chan->next = buff;

		}



		show_lli(endlli);

		chan->end = buff;

	} else {

		pr_debug("enquing onto empty channel\n");



		chan->curr = buff;

		chan->next = buff;

		chan->end = buff;



		s3c64xx_lli_to_regs(chan, lli);

	}



	local_irq_restore(flags);



	show_lli(lli);



	dbg_showchan(chan);

	dbg_showbuffs(chan);

	return 0;



err_buff:

	kfree(buff);

	return ret;

}



EXPORT_SYMBOL(s3c2410_dma_enqueue);





int s3c2410_dma_devconfig(enum dma_ch channel,

			  enum dma_data_direction source,

			  unsigned long devaddr)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);

	u32 peripheral;

	u32 config = 0;



	pr_debug("%s: channel %d, source %d, dev %08lx, chan %p\n",

		 __func__, channel, source, devaddr, chan);



	WARN_ON(!chan);

	if (!chan)

		return -EINVAL;



	peripheral = (chan->peripheral & 0xf);

	chan->source = source;

	chan->dev_addr = devaddr;



	pr_debug("%s: peripheral %d\n", __func__, peripheral);



	switch (source) {

	case DMA_FROM_DEVICE:

		config = 2 << PL080_CONFIG_FLOW_CONTROL_SHIFT;

		config |= peripheral << PL080_CONFIG_SRC_SEL_SHIFT;

		break;

	case DMA_TO_DEVICE:

		config = 1 << PL080_CONFIG_FLOW_CONTROL_SHIFT;

		config |= peripheral << PL080_CONFIG_DST_SEL_SHIFT;

		break;

	default:

		printk(KERN_ERR "%s: bad source\n", __func__);

		return -EINVAL;

	}



	/* allow TC and ERR interrupts */

	config |= PL080_CONFIG_TC_IRQ_MASK;

	config |= PL080_CONFIG_ERR_IRQ_MASK;



	pr_debug("%s: config %08x\n", __func__, config);



	writel(config, chan->regs + PL080S_CH_CONFIG);



	return 0;

}

EXPORT_SYMBOL(s3c2410_dma_devconfig);





int s3c2410_dma_getposition(enum dma_ch channel,

			    dma_addr_t *src, dma_addr_t *dst)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);



	WARN_ON(!chan);

	if (!chan)

		return -EINVAL;



	if (src != NULL)

		*src = readl(chan->regs + PL080_CH_SRC_ADDR);



	if (dst != NULL)

		*dst = readl(chan->regs + PL080_CH_DST_ADDR);



	return 0;

}

EXPORT_SYMBOL(s3c2410_dma_getposition);



/* s3c2410_request_dma

 *

 * get control of an dma channel

*/



int s3c2410_dma_request(enum dma_ch channel,

			struct s3c2410_dma_client *client,

			void *dev)

{

	struct s3c2410_dma_chan *chan;

	unsigned long flags;



	pr_debug("dma%d: s3c2410_request_dma: client=%s, dev=%p\n",

		 channel, client->name, dev);



	local_irq_save(flags);



	chan = s3c64xx_dma_map_channel(channel);

	if (chan == NULL) {

		local_irq_restore(flags);

		return -EBUSY;

	}



	dbg_showchan(chan);



	chan->client = client;

	chan->in_use = 1;

	chan->peripheral = channel;

	chan->flags = 0;



	local_irq_restore(flags);



	/* need to setup */



	pr_debug("%s: channel initialised, %p\n", __func__, chan);



	return chan->number | DMACH_LOW_LEVEL;

}



EXPORT_SYMBOL(s3c2410_dma_request);



/* s3c2410_dma_free

 *

 * release the given channel back to the system, will stop and flush

 * any outstanding transfers, and ensure the channel is ready for the

 * next claimant.

 *

 * Note, although a warning is currently printed if the freeing client

 * info is not the same as the registrant's client info, the free is still

 * allowed to go through.

*/



int s3c2410_dma_free(enum dma_ch channel, struct s3c2410_dma_client *client)

{

	struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);

	unsigned long flags;



	if (chan == NULL)

		return -EINVAL;



	local_irq_save(flags);



	if (chan->client != client) {

		printk(KERN_WARNING "dma%d: possible free from different client (channel %p, passed %p)\n",

		       channel, chan->client, client);

	}



	/* sort out stopping and freeing the channel */





	chan->client = NULL;

	chan->in_use = 0;



	if (!(channel & DMACH_LOW_LEVEL))

		s3c_dma_chan_map[channel] = NULL;



	local_irq_restore(flags);



	return 0;

}



EXPORT_SYMBOL(s3c2410_dma_free);



static irqreturn_t s3c64xx_dma_irq(int irq, void *pw)

{

	struct s3c64xx_dmac *dmac = pw;

	struct s3c2410_dma_chan *chan;

	enum s3c2410_dma_buffresult res;

	u32 tcstat, errstat;

	u32 bit;

	int offs;



	tcstat = readl(dmac->regs + PL080_TC_STATUS);

	errstat = readl(dmac->regs + PL080_ERR_STATUS);



	for (offs = 0, bit = 1; offs < 8; offs++, bit <<= 1) {

		struct s3c64xx_dma_buff *buff;



		if (!(errstat & bit) && !(tcstat & bit))

			continue;



		chan = dmac->channels + offs;

		res = S3C2410_RES_ERR;



		if (tcstat & bit) {

			writel(bit, dmac->regs + PL080_TC_CLEAR);

			res = S3C2410_RES_OK;

		}



		if (errstat & bit)

			writel(bit, dmac->regs + PL080_ERR_CLEAR);



		/* 'next' points to the buffer that is next to the

		 * currently active buffer.

		 * For CIRCULAR queues, 'next' will be same as 'curr'

		 * when 'end' is the active buffer.

		 */

		buff = chan->curr;

		while (buff && buff != chan->next

				&& buff->next != chan->next)

			buff = buff->next;



		if (!buff)

			BUG();



		if (buff == chan->next)

			buff = chan->end;



		s3c64xx_dma_bufffdone(chan, buff, res);



		/* Free the node and update curr, if non-circular queue */

		if (!(chan->flags & S3C2410_DMAF_CIRCULAR)) {

			chan->curr = buff->next;

			s3c64xx_dma_freebuff(buff);

		}



		/* Update 'next' */

		buff = chan->next;

		if (chan->next == chan->end) {

			chan->next = chan->curr;

			if (!(chan->flags & S3C2410_DMAF_CIRCULAR))

				chan->end = NULL;

		} else {

			chan->next = buff->next;

		}

	}



	return IRQ_HANDLED;

}



static struct bus_type dma_subsys = {

	.name		= "s3c64xx-dma",

	.dev_name	= "s3c64xx-dma",

};



static int s3c64xx_dma_init1(int chno, enum dma_ch chbase,

			     int irq, unsigned int base)

{

	struct s3c2410_dma_chan *chptr = &s3c2410_chans[chno];

	struct s3c64xx_dmac *dmac;

	char clkname[16];

	void __iomem *regs;

	void __iomem *regptr;

	int err, ch;



	dmac = kzalloc(sizeof(struct s3c64xx_dmac), GFP_KERNEL);

	if (!dmac) {

		printk(KERN_ERR "%s: failed to alloc mem\n", __func__);

		return -ENOMEM;

	}



	dmac->dev.id = chno / 8;

	dmac->dev.bus = &dma_subsys;



	err = device_register(&dmac->dev);

	if (err) {

		printk(KERN_ERR "%s: failed to register device\n", __func__);

		goto err_alloc;

	}



	regs = ioremap(base, 0x200);

	if (!regs) {

		printk(KERN_ERR "%s: failed to ioremap()\n", __func__);

		err = -ENXIO;

		goto err_dev;

	}



	snprintf(clkname, sizeof(clkname), "dma%d", dmac->dev.id);



	dmac->clk = clk_get(NULL, clkname);

	if (IS_ERR(dmac->clk)) {

		printk(KERN_ERR "%s: failed to get clock %s\n", __func__, clkname);

		err = PTR_ERR(dmac->clk);

		goto err_map;

	}



	clk_prepare_enable(dmac->clk);



	dmac->regs = regs;

	dmac->chanbase = chbase;

	dmac->channels = chptr;



	err = request_irq(irq, s3c64xx_dma_irq, 0, "DMA", dmac);

	if (err < 0) {

		printk(KERN_ERR "%s: failed to get irq\n", __func__);

		goto err_clk;

	}



	regptr = regs + PL080_Cx_BASE(0);



	for (ch = 0; ch < 8; ch++, chptr++) {

		pr_debug("%s: registering DMA %d (%p)\n",

			 __func__, chno + ch, regptr);



		chptr->bit = 1 << ch;

		chptr->number = chno + ch;

		chptr->dmac = dmac;

		chptr->regs = regptr;

		regptr += PL080_Cx_STRIDE;

	}



	/* for the moment, permanently enable the controller */

	writel(PL080_CONFIG_ENABLE, regs + PL080_CONFIG);



	printk(KERN_INFO "PL080: IRQ %d, at %p, channels %d..%d\n",

	       irq, regs, chno, chno+8);



	return 0;



err_clk:

	clk_disable_unprepare(dmac->clk);

	clk_put(dmac->clk);

err_map:

	iounmap(regs);

err_dev:

	device_unregister(&dmac->dev);

err_alloc:

	kfree(dmac);

	return err;

}



static int __init s3c64xx_dma_init(void)

{

	int ret;



	/* This driver is not supported when booting with device tree. */

	if (of_have_populated_dt())

		return -ENODEV;



	printk(KERN_INFO "%s: Registering DMA channels\n", __func__);



	dma_pool = dma_pool_create("DMA-LLI", NULL, sizeof(struct pl080s_lli), 16, 0);

	if (!dma_pool) {

		printk(KERN_ERR "%s: failed to create pool\n", __func__);

		return -ENOMEM;

	}



	ret = subsys_system_register(&dma_subsys, NULL);

	if (ret) {

		printk(KERN_ERR "%s: failed to create subsys\n", __func__);

		return -ENOMEM;

	}



	/* Set all DMA configuration to be DMA, not SDMA */

	writel(0xffffff, S3C64XX_SDMA_SEL);



	/* Register standard DMA controllers */

	s3c64xx_dma_init1(0, DMACH_UART0, IRQ_DMA0, 0x75000000);

	s3c64xx_dma_init1(8, DMACH_PCM1_TX, IRQ_DMA1, 0x75100000);



	return 0;

}



arch_initcall(s3c64xx_dma_init);