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