[net-next-2.6.git] / arch / sh / drivers / dma / dma-api.c

/*
 * arch/sh/drivers/dma/dma-api.c
 *
 * SuperH-specific DMA management API
 *
 * Copyright (C) 2003, 2004, 2005  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/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <asm/dma.h>

DEFINE_SPINLOCK(dma_spin_lock);
static LIST_HEAD(registered_dmac_list);

struct dma_info *get_dma_info(unsigned int chan)
{
	struct dma_info *info;

	/*
	 * Look for each DMAC's range to determine who the owner of
	 * the channel is.
	 */
	list_for_each_entry(info, &registered_dmac_list, list) {
		if ((chan <  info->first_vchannel_nr) ||
		    (chan >= info->first_vchannel_nr + info->nr_channels))
			continue;

		return info;
	}

	return NULL;
}
EXPORT_SYMBOL(get_dma_info);

struct dma_info *get_dma_info_by_name(const char *dmac_name)
{
	struct dma_info *info;

	list_for_each_entry(info, &registered_dmac_list, list) {
		if (dmac_name && (strcmp(dmac_name, info->name) != 0))
			continue;
		else
			return info;
	}

	return NULL;
}
EXPORT_SYMBOL(get_dma_info_by_name);

static unsigned int get_nr_channels(void)
{
	struct dma_info *info;
	unsigned int nr = 0;

	if (unlikely(list_empty(&registered_dmac_list)))
		return nr;

	list_for_each_entry(info, &registered_dmac_list, list)
		nr += info->nr_channels;

	return nr;
}

struct dma_channel *get_dma_channel(unsigned int chan)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel;
	int i;

	if (unlikely(!info))
		return ERR_PTR(-EINVAL);

	for (i = 0; i < info->nr_channels; i++) {
		channel = &info->channels[i];
		if (channel->vchan == chan)
			return channel;
	}

	return NULL;
}
EXPORT_SYMBOL(get_dma_channel);

int get_dma_residue(unsigned int chan)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	if (info->ops->get_residue)
		return info->ops->get_residue(channel);

	return 0;
}
EXPORT_SYMBOL(get_dma_residue);

static int search_cap(const char **haystack, const char *needle)
{
	const char **p;

	for (p = haystack; *p; p++)
		if (strcmp(*p, needle) == 0)
			return 1;

	return 0;
}

/**
 * request_dma_bycap - Allocate a DMA channel based on its capabilities
 * @dmac: List of DMA controllers to search
 * @caps: List of capabilities
 *
 * Search all channels of all DMA controllers to find a channel which
 * matches the requested capabilities. The result is the channel
 * number if a match is found, or %-ENODEV if no match is found.
 *
 * Note that not all DMA controllers export capabilities, in which
 * case they can never be allocated using this API, and so
 * request_dma() must be used specifying the channel number.
 */
int request_dma_bycap(const char **dmac, const char **caps, const char *dev_id)
{
	unsigned int found = 0;
	struct dma_info *info;
	const char **p;
	int i;

	BUG_ON(!dmac || !caps);

	list_for_each_entry(info, &registered_dmac_list, list)
		if (strcmp(*dmac, info->name) == 0) {
			found = 1;
			break;
		}

	if (!found)
		return -ENODEV;

	for (i = 0; i < info->nr_channels; i++) {
		struct dma_channel *channel = &info->channels[i];

		if (unlikely(!channel->caps))
			continue;

		for (p = caps; *p; p++) {
			if (!search_cap(channel->caps, *p))
				break;
			if (request_dma(channel->chan, dev_id) == 0)
				return channel->chan;
		}
	}

	return -EINVAL;
}
EXPORT_SYMBOL(request_dma_bycap);

int dmac_search_free_channel(const char *dev_id)
{
	struct dma_channel *channel = { 0 };
	struct dma_info *info = get_dma_info(0);
	int i;

	for (i = 0; i < info->nr_channels; i++) {
		channel = &info->channels[i];
		if (unlikely(!channel))
			return -ENODEV;

		if (atomic_read(&channel->busy) == 0)
			break;
	}

	if (info->ops->request) {
		int result = info->ops->request(channel);
		if (result)
			return result;

		atomic_set(&channel->busy, 1);
		return channel->chan;
	}

	return -ENOSYS;
}

int request_dma(unsigned int chan, const char *dev_id)
{
	struct dma_channel *channel = { 0 };
	struct dma_info *info = get_dma_info(chan);
	int result;

	channel = get_dma_channel(chan);
	if (atomic_xchg(&channel->busy, 1))
		return -EBUSY;

	strlcpy(channel->dev_id, dev_id, sizeof(channel->dev_id));

	if (info->ops->request) {
		result = info->ops->request(channel);
		if (result)
			atomic_set(&channel->busy, 0);

		return result;
	}

	return 0;
}
EXPORT_SYMBOL(request_dma);

void free_dma(unsigned int chan)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	if (info->ops->free)
		info->ops->free(channel);

	atomic_set(&channel->busy, 0);
}
EXPORT_SYMBOL(free_dma);

void dma_wait_for_completion(unsigned int chan)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	if (channel->flags & DMA_TEI_CAPABLE) {
		wait_event(channel->wait_queue,
			   (info->ops->get_residue(channel) == 0));
		return;
	}

	while (info->ops->get_residue(channel))
		cpu_relax();
}
EXPORT_SYMBOL(dma_wait_for_completion);

int register_chan_caps(const char *dmac, struct dma_chan_caps *caps)
{
	struct dma_info *info;
	unsigned int found = 0;
	int i;

	list_for_each_entry(info, &registered_dmac_list, list)
		if (strcmp(dmac, info->name) == 0) {
			found = 1;
			break;
		}

	if (unlikely(!found))
		return -ENODEV;

	for (i = 0; i < info->nr_channels; i++, caps++) {
		struct dma_channel *channel;

		if ((info->first_channel_nr + i) != caps->ch_num)
			return -EINVAL;

		channel = &info->channels[i];
		channel->caps = caps->caplist;
	}

	return 0;
}
EXPORT_SYMBOL(register_chan_caps);

void dma_configure_channel(unsigned int chan, unsigned long flags)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	if (info->ops->configure)
		info->ops->configure(channel, flags);
}
EXPORT_SYMBOL(dma_configure_channel);

int dma_xfer(unsigned int chan, unsigned long from,
	     unsigned long to, size_t size, unsigned int mode)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	channel->sar	= from;
	channel->dar	= to;
	channel->count	= size;
	channel->mode	= mode;

	return info->ops->xfer(channel);
}
EXPORT_SYMBOL(dma_xfer);

int dma_extend(unsigned int chan, unsigned long op, void *param)
{
	struct dma_info *info = get_dma_info(chan);
	struct dma_channel *channel = get_dma_channel(chan);

	if (info->ops->extend)
		return info->ops->extend(channel, op, param);

	return -ENOSYS;
}
EXPORT_SYMBOL(dma_extend);

static int dma_read_proc(char *buf, char **start, off_t off,
			 int len, int *eof, void *data)
{
	struct dma_info *info;
	char *p = buf;

	if (list_empty(&registered_dmac_list))
		return 0;

	/*
	 * Iterate over each registered DMAC
	 */
	list_for_each_entry(info, &registered_dmac_list, list) {
		int i;

		/*
		 * Iterate over each channel
		 */
		for (i = 0; i < info->nr_channels; i++) {
			struct dma_channel *channel = info->channels + i;

			if (!(channel->flags & DMA_CONFIGURED))
				continue;

			p += sprintf(p, "%2d: %14s    %s\n", i,
				     info->name, channel->dev_id);
		}
	}

	return p - buf;
}

int register_dmac(struct dma_info *info)
{
	unsigned int total_channels, i;

	INIT_LIST_HEAD(&info->list);

	printk(KERN_INFO "DMA: Registering %s handler (%d channel%s).\n",
	       info->name, info->nr_channels, info->nr_channels > 1 ? "s" : "");

	BUG_ON((info->flags & DMAC_CHANNELS_CONFIGURED) && !info->channels);

	info->pdev = platform_device_register_simple(info->name, -1,
						     NULL, 0);
	if (IS_ERR(info->pdev))
		return PTR_ERR(info->pdev);

	/*
	 * Don't touch pre-configured channels
	 */
	if (!(info->flags & DMAC_CHANNELS_CONFIGURED)) {
		unsigned int size;

		size = sizeof(struct dma_channel) * info->nr_channels;

		info->channels = kzalloc(size, GFP_KERNEL);
		if (!info->channels)
			return -ENOMEM;
	}

	total_channels = get_nr_channels();
	info->first_vchannel_nr = total_channels;
	for (i = 0; i < info->nr_channels; i++) {
		struct dma_channel *chan = &info->channels[i];

		atomic_set(&chan->busy, 0);

		chan->chan  = info->first_channel_nr + i;
		chan->vchan = info->first_channel_nr + i + total_channels;

		memcpy(chan->dev_id, "Unused", 7);

		if (info->flags & DMAC_CHANNELS_TEI_CAPABLE)
			chan->flags |= DMA_TEI_CAPABLE;

		init_waitqueue_head(&chan->wait_queue);
		dma_create_sysfs_files(chan, info);
	}

	list_add(&info->list, &registered_dmac_list);

	return 0;
}
EXPORT_SYMBOL(register_dmac);

void unregister_dmac(struct dma_info *info)
{
	unsigned int i;

	for (i = 0; i < info->nr_channels; i++)
		dma_remove_sysfs_files(info->channels + i, info);

	if (!(info->flags & DMAC_CHANNELS_CONFIGURED))
		kfree(info->channels);

	list_del(&info->list);
	platform_device_unregister(info->pdev);
}
EXPORT_SYMBOL(unregister_dmac);

static int __init dma_api_init(void)
{
	printk(KERN_NOTICE "DMA: Registering DMA API.\n");
	create_proc_read_entry("dma", 0, 0, dma_read_proc, 0);
	return 0;
}
subsys_initcall(dma_api_init);

MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
MODULE_DESCRIPTION("DMA API for SuperH");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/sh/drivers/dma/dma-api.c
	3	*
	4	* SuperH-specific DMA management API
	5	*
0d831770	6	* Copyright (C) 2003, 2004, 2005 Paul Mundt
1da177e4 LT	7	*
	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file "COPYING" in the main directory of this archive
	10	* for more details.
	11	*/
	12	#include <linux/init.h>
	13	#include <linux/module.h>
1da177e4 LT	14	#include <linux/spinlock.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/list.h>
0d831770	17	#include <linux/platform_device.h>
db9b99d4	18	#include <linux/mm.h>
bdff33dd	19	#include <linux/sched.h>
5a0e3ad6	20	#include <linux/slab.h>
1da177e4 LT	21	#include <asm/dma.h>
	22
	23	DEFINE_SPINLOCK(dma_spin_lock);
	24	static LIST_HEAD(registered_dmac_list);
	25
1da177e4 LT	26	struct dma_info *get_dma_info(unsigned int chan)
1da177e4 LT	27	{
0d831770	28	struct dma_info *info;
1da177e4 LT	29
	30	/*
	31	* Look for each DMAC's range to determine who the owner of
	32	* the channel is.
	33	*/
0d831770	34	list_for_each_entry(info, &registered_dmac_list, list) {
eb695dbf AM	35	if ((chan < info->first_vchannel_nr) \|\|
eb695dbf AM	36	(chan >= info->first_vchannel_nr + info->nr_channels))
1da177e4 LT	37	continue;
	38
	39	return info;
	40	}
	41
	42	return NULL;
	43	}
db9b99d4 MG	44	EXPORT_SYMBOL(get_dma_info);
	45
	46	struct dma_info get_dma_info_by_name(const char dmac_name)
	47	{
	48	struct dma_info *info;
	49
	50	list_for_each_entry(info, &registered_dmac_list, list) {
	51	if (dmac_name && (strcmp(dmac_name, info->name) != 0))
	52	continue;
	53	else
	54	return info;
	55	}
	56
	57	return NULL;
	58	}
	59	EXPORT_SYMBOL(get_dma_info_by_name);
1da177e4	60
0d831770 PM	61	static unsigned int get_nr_channels(void)
	62	{
	63	struct dma_info *info;
	64	unsigned int nr = 0;
	65
	66	if (unlikely(list_empty(&registered_dmac_list)))
	67	return nr;
	68
	69	list_for_each_entry(info, &registered_dmac_list, list)
	70	nr += info->nr_channels;
	71
	72	return nr;
	73	}
	74
1da177e4 LT	75	struct dma_channel *get_dma_channel(unsigned int chan)
	76	{
	77	struct dma_info *info = get_dma_info(chan);
db9b99d4 MG	78	struct dma_channel *channel;
db9b99d4 MG	79	int i;
1da177e4	80
db9b99d4	81	if (unlikely(!info))
1da177e4 LT	82	return ERR_PTR(-EINVAL);
1da177e4 LT	83
db9b99d4 MG	84	for (i = 0; i < info->nr_channels; i++) {
db9b99d4 MG	85	channel = &info->channels[i];
eb695dbf	86	if (channel->vchan == chan)
db9b99d4 MG	87	return channel;
	88	}
	89
	90	return NULL;
1da177e4	91	}
db9b99d4	92	EXPORT_SYMBOL(get_dma_channel);
1da177e4 LT	93
	94	int get_dma_residue(unsigned int chan)
	95	{
	96	struct dma_info *info = get_dma_info(chan);
db9b99d4	97	struct dma_channel *channel = get_dma_channel(chan);
1da177e4 LT	98
	99	if (info->ops->get_residue)
	100	return info->ops->get_residue(channel);
	101
	102	return 0;
	103	}
db9b99d4	104	EXPORT_SYMBOL(get_dma_residue);
1da177e4	105
db9b99d4	106	static int search_cap(const char *haystack, const char needle)
1da177e4	107	{
db9b99d4 MG	108	const char **p;
	109
	110	for (p = haystack; *p; p++)
	111	if (strcmp(*p, needle) == 0)
	112	return 1;
	113
	114	return 0;
	115	}
	116
	117	/**
	118	* request_dma_bycap - Allocate a DMA channel based on its capabilities
	119	* @dmac: List of DMA controllers to search
e868d612	120	* @caps: List of capabilities
db9b99d4 MG	121	*
	122	* Search all channels of all DMA controllers to find a channel which
	123	* matches the requested capabilities. The result is the channel
	124	* number if a match is found, or %-ENODEV if no match is found.
	125	*
	126	* Note that not all DMA controllers export capabilities, in which
	127	* case they can never be allocated using this API, and so
	128	* request_dma() must be used specifying the channel number.
	129	*/
	130	int request_dma_bycap(const char dmac, const char caps, const char *dev_id)
	131	{
	132	unsigned int found = 0;
	133	struct dma_info *info;
	134	const char **p;
	135	int i;
	136
	137	BUG_ON(!dmac \|\| !caps);
	138
	139	list_for_each_entry(info, &registered_dmac_list, list)
	140	if (strcmp(*dmac, info->name) == 0) {
	141	found = 1;
	142	break;
	143	}
	144
	145	if (!found)
	146	return -ENODEV;
	147
	148	for (i = 0; i < info->nr_channels; i++) {
	149	struct dma_channel *channel = &info->channels[i];
	150
	151	if (unlikely(!channel->caps))
	152	continue;
	153
	154	for (p = caps; *p; p++) {
	155	if (!search_cap(channel->caps, *p))
	156	break;
	157	if (request_dma(channel->chan, dev_id) == 0)
	158	return channel->chan;
	159	}
	160	}
	161
	162	return -EINVAL;
	163	}
	164	EXPORT_SYMBOL(request_dma_bycap);
	165
	166	int dmac_search_free_channel(const char *dev_id)
	167	{
	168	struct dma_channel *channel = { 0 };
	169	struct dma_info *info = get_dma_info(0);
	170	int i;
	171
	172	for (i = 0; i < info->nr_channels; i++) {
	173	channel = &info->channels[i];
	174	if (unlikely(!channel))
	175	return -ENODEV;
	176
	177	if (atomic_read(&channel->busy) == 0)
	178	break;
	179	}
1da177e4	180
db9b99d4 MG	181	if (info->ops->request) {
	182	int result = info->ops->request(channel);
	183	if (result)
	184	return result;
1da177e4	185
db9b99d4 MG	186	atomic_set(&channel->busy, 1);
db9b99d4 MG	187	return channel->chan;
1da177e4 LT	188	}
1da177e4 LT	189
db9b99d4 MG	190	return -ENOSYS;
	191	}
	192
	193	int request_dma(unsigned int chan, const char *dev_id)
	194	{
	195	struct dma_channel *channel = { 0 };
	196	struct dma_info *info = get_dma_info(chan);
	197	int result;
	198
	199	channel = get_dma_channel(chan);
	200	if (atomic_xchg(&channel->busy, 1))
	201	return -EBUSY;
1da177e4 LT	202
	203	strlcpy(channel->dev_id, dev_id, sizeof(channel->dev_id));
	204
db9b99d4 MG	205	if (info->ops->request) {
	206	result = info->ops->request(channel);
	207	if (result)
	208	atomic_set(&channel->busy, 0);
1da177e4	209
db9b99d4 MG	210	return result;
db9b99d4 MG	211	}
1da177e4 LT	212
	213	return 0;
	214	}
db9b99d4	215	EXPORT_SYMBOL(request_dma);
1da177e4 LT	216
	217	void free_dma(unsigned int chan)
	218	{
	219	struct dma_info *info = get_dma_info(chan);
db9b99d4	220	struct dma_channel *channel = get_dma_channel(chan);
1da177e4 LT	221
	222	if (info->ops->free)
	223	info->ops->free(channel);
	224
	225	atomic_set(&channel->busy, 0);
	226	}
db9b99d4	227	EXPORT_SYMBOL(free_dma);
1da177e4 LT	228
	229	void dma_wait_for_completion(unsigned int chan)
	230	{
	231	struct dma_info *info = get_dma_info(chan);
db9b99d4	232	struct dma_channel *channel = get_dma_channel(chan);
1da177e4 LT	233
	234	if (channel->flags & DMA_TEI_CAPABLE) {
	235	wait_event(channel->wait_queue,
	236	(info->ops->get_residue(channel) == 0));
	237	return;
	238	}
	239
	240	while (info->ops->get_residue(channel))
	241	cpu_relax();
	242	}
db9b99d4 MG	243	EXPORT_SYMBOL(dma_wait_for_completion);
	244
	245	int register_chan_caps(const char dmac, struct dma_chan_caps caps)
	246	{
	247	struct dma_info *info;
	248	unsigned int found = 0;
	249	int i;
	250
	251	list_for_each_entry(info, &registered_dmac_list, list)
	252	if (strcmp(dmac, info->name) == 0) {
	253	found = 1;
	254	break;
	255	}
	256
	257	if (unlikely(!found))
	258	return -ENODEV;
	259
	260	for (i = 0; i < info->nr_channels; i++, caps++) {
	261	struct dma_channel *channel;
	262
	263	if ((info->first_channel_nr + i) != caps->ch_num)
	264	return -EINVAL;
	265
	266	channel = &info->channels[i];
	267	channel->caps = caps->caplist;
	268	}
	269
	270	return 0;
	271	}
	272	EXPORT_SYMBOL(register_chan_caps);
1da177e4 LT	273
	274	void dma_configure_channel(unsigned int chan, unsigned long flags)
	275	{
	276	struct dma_info *info = get_dma_info(chan);
db9b99d4	277	struct dma_channel *channel = get_dma_channel(chan);
1da177e4 LT	278
	279	if (info->ops->configure)
	280	info->ops->configure(channel, flags);
	281	}
db9b99d4	282	EXPORT_SYMBOL(dma_configure_channel);
1da177e4 LT	283
	284	int dma_xfer(unsigned int chan, unsigned long from,
	285	unsigned long to, size_t size, unsigned int mode)
	286	{
	287	struct dma_info *info = get_dma_info(chan);
db9b99d4	288	struct dma_channel *channel = get_dma_channel(chan);
1da177e4 LT	289
	290	channel->sar = from;
	291	channel->dar = to;
	292	channel->count = size;
	293	channel->mode = mode;
	294
	295	return info->ops->xfer(channel);
	296	}
db9b99d4 MG	297	EXPORT_SYMBOL(dma_xfer);
	298
	299	int dma_extend(unsigned int chan, unsigned long op, void *param)
	300	{
	301	struct dma_info *info = get_dma_info(chan);
	302	struct dma_channel *channel = get_dma_channel(chan);
	303
	304	if (info->ops->extend)
	305	return info->ops->extend(channel, op, param);
	306
	307	return -ENOSYS;
	308	}
	309	EXPORT_SYMBOL(dma_extend);
1da177e4	310
1da177e4 LT	311	static int dma_read_proc(char buf, char *start, off_t off,
	312	int len, int eof, void data)
	313	{
0d831770	314	struct dma_info *info;
1da177e4 LT	315	char *p = buf;
	316
	317	if (list_empty(&registered_dmac_list))
	318	return 0;
	319
	320	/*
	321	* Iterate over each registered DMAC
	322	*/
0d831770	323	list_for_each_entry(info, &registered_dmac_list, list) {
1da177e4 LT	324	int i;
	325
	326	/*
	327	* Iterate over each channel
	328	*/
	329	for (i = 0; i < info->nr_channels; i++) {
	330	struct dma_channel *channel = info->channels + i;
	331
	332	if (!(channel->flags & DMA_CONFIGURED))
	333	continue;
	334
	335	p += sprintf(p, "%2d: %14s %s\n", i,
	336	info->name, channel->dev_id);
	337	}
	338	}
	339
	340	return p - buf;
	341	}
1da177e4	342
0d831770	343	int register_dmac(struct dma_info *info)
1da177e4	344	{
0d831770	345	unsigned int total_channels, i;
1da177e4 LT	346
	347	INIT_LIST_HEAD(&info->list);
	348
	349	printk(KERN_INFO "DMA: Registering %s handler (%d channel%s).\n",
db9b99d4	350	info->name, info->nr_channels, info->nr_channels > 1 ? "s" : "");
1da177e4 LT	351
	352	BUG_ON((info->flags & DMAC_CHANNELS_CONFIGURED) && !info->channels);
	353
222dc791	354	info->pdev = platform_device_register_simple(info->name, -1,
0d831770 PM	355	NULL, 0);
	356	if (IS_ERR(info->pdev))
	357	return PTR_ERR(info->pdev);
	358
1da177e4 LT	359	/*
	360	* Don't touch pre-configured channels
	361	*/
	362	if (!(info->flags & DMAC_CHANNELS_CONFIGURED)) {
	363	unsigned int size;
	364
	365	size = sizeof(struct dma_channel) * info->nr_channels;
	366
db9b99d4	367	info->channels = kzalloc(size, GFP_KERNEL);
1da177e4 LT	368	if (!info->channels)
1da177e4 LT	369	return -ENOMEM;
1da177e4 LT	370	}
1da177e4 LT	371
0d831770	372	total_channels = get_nr_channels();
eb695dbf	373	info->first_vchannel_nr = total_channels;
1da177e4	374	for (i = 0; i < info->nr_channels; i++) {
db9b99d4 MG	375	struct dma_channel *chan = &info->channels[i];
	376
	377	atomic_set(&chan->busy, 0);
1da177e4	378
db9b99d4 MG	379	chan->chan = info->first_channel_nr + i;
db9b99d4 MG	380	chan->vchan = info->first_channel_nr + i + total_channels;
1da177e4 LT	381
	382	memcpy(chan->dev_id, "Unused", 7);
	383
	384	if (info->flags & DMAC_CHANNELS_TEI_CAPABLE)
	385	chan->flags \|= DMA_TEI_CAPABLE;
	386
1da177e4	387	init_waitqueue_head(&chan->wait_queue);
0d831770	388	dma_create_sysfs_files(chan, info);
1da177e4 LT	389	}
	390
	391	list_add(&info->list, &registered_dmac_list);
	392
	393	return 0;
	394	}
db9b99d4	395	EXPORT_SYMBOL(register_dmac);
1da177e4	396
0d831770	397	void unregister_dmac(struct dma_info *info)
1da177e4	398	{
0d831770 PM	399	unsigned int i;
	400
	401	for (i = 0; i < info->nr_channels; i++)
	402	dma_remove_sysfs_files(info->channels + i, info);
	403
1da177e4 LT	404	if (!(info->flags & DMAC_CHANNELS_CONFIGURED))
	405	kfree(info->channels);
	406
	407	list_del(&info->list);
0d831770	408	platform_device_unregister(info->pdev);
1da177e4	409	}
db9b99d4	410	EXPORT_SYMBOL(unregister_dmac);
1da177e4 LT	411
	412	static int __init dma_api_init(void)
	413	{
db9b99d4	414	printk(KERN_NOTICE "DMA: Registering DMA API.\n");
1da177e4	415	create_proc_read_entry("dma", 0, 0, dma_read_proc, 0);
1da177e4 LT	416	return 0;
1da177e4 LT	417	}
1da177e4 LT	418	subsys_initcall(dma_api_init);
	419
	420	MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
	421	MODULE_DESCRIPTION("DMA API for SuperH");
	422	MODULE_LICENSE("GPL");