[mirror_ubuntu-bionic-kernel.git] / sound / soc / samsung / idma.c

/*
 * sound/soc/samsung/idma.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * I2S0's Internal DMA driver
 *
 * 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.
 */
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "i2s.h"
#include "idma.h"
#include "dma.h"
#include "i2s-regs.h"

#define ST_RUNNING		(1<<0)
#define ST_OPENED		(1<<1)

static const struct snd_pcm_hardware idma_hardware = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		    SNDRV_PCM_INFO_BLOCK_TRANSFER |
		    SNDRV_PCM_INFO_MMAP |
		    SNDRV_PCM_INFO_MMAP_VALID |
		    SNDRV_PCM_INFO_PAUSE |
		    SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S16_LE |
		    SNDRV_PCM_FMTBIT_U16_LE |
		    SNDRV_PCM_FMTBIT_S24_LE |
		    SNDRV_PCM_FMTBIT_U24_LE |
		    SNDRV_PCM_FMTBIT_U8 |
		    SNDRV_PCM_FMTBIT_S8,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = MAX_IDMA_BUFFER,
	.period_bytes_min = 128,
	.period_bytes_max = MAX_IDMA_PERIOD,
	.periods_min = 1,
	.periods_max = 2,
};

struct idma_ctrl {
	spinlock_t	lock;
	int		state;
	dma_addr_t	start;
	dma_addr_t	pos;
	dma_addr_t	end;
	dma_addr_t	period;
	dma_addr_t	periodsz;
	void		*token;
	void		(*cb)(void *dt, int bytes_xfer);
};

static struct idma_info {
	spinlock_t	lock;
	void		 __iomem  *regs;
	dma_addr_t	lp_tx_addr;
} idma;

static void idma_getpos(dma_addr_t *src)
{
	*src = idma.lp_tx_addr +
		(readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
}

static int idma_enqueue(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd = substream->runtime->private_data;
	u32 val;

	spin_lock(&prtd->lock);
	prtd->token = (void *) substream;
	spin_unlock(&prtd->lock);

	/* Internal DMA Level0 Interrupt Address */
	val = idma.lp_tx_addr + prtd->periodsz;
	writel(val, idma.regs + I2SLVL0ADDR);

	/* Start address0 of I2S internal DMA operation. */
	val = idma.lp_tx_addr;
	writel(val, idma.regs + I2SSTR0);

	/*
	 * Transfer block size for I2S internal DMA.
	 * Should decide transfer size before start dma operation
	 */
	val = readl(idma.regs + I2SSIZE);
	val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
	val |= (((runtime->dma_bytes >> 2) &
			I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
	writel(val, idma.regs + I2SSIZE);

	val = readl(idma.regs + I2SAHB);
	val |= AHB_INTENLVL0;
	writel(val, idma.regs + I2SAHB);

	return 0;
}

static void idma_setcallbk(struct snd_pcm_substream *substream,
				void (*cb)(void *, int))
{
	struct idma_ctrl *prtd = substream->runtime->private_data;

	spin_lock(&prtd->lock);
	prtd->cb = cb;
	spin_unlock(&prtd->lock);
}

static void idma_control(int op)
{
	u32 val = readl(idma.regs + I2SAHB);

	spin_lock(&idma.lock);

	switch (op) {
	case LPAM_DMA_START:
		val |= (AHB_INTENLVL0 | AHB_DMAEN);
		break;
	case LPAM_DMA_STOP:
		val &= ~(AHB_INTENLVL0 | AHB_DMAEN);
		break;
	default:
		spin_unlock(&idma.lock);
		return;
	}

	writel(val, idma.regs + I2SAHB);
	spin_unlock(&idma.lock);
}

static void idma_done(void *id, int bytes_xfer)
{
	struct snd_pcm_substream *substream = id;
	struct idma_ctrl *prtd = substream->runtime->private_data;

	if (prtd && (prtd->state & ST_RUNNING))
		snd_pcm_period_elapsed(substream);
}

static int idma_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd = substream->runtime->private_data;
	u32 mod = readl(idma.regs + I2SMOD);
	u32 ahb = readl(idma.regs + I2SAHB);

	ahb |= (AHB_DMARLD | AHB_INTMASK);
	mod |= MOD_TXS_IDMA;
	writel(ahb, idma.regs + I2SAHB);
	writel(mod, idma.regs + I2SMOD);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	prtd->start = prtd->pos = runtime->dma_addr;
	prtd->period = params_periods(params);
	prtd->periodsz = params_period_bytes(params);
	prtd->end = runtime->dma_addr + runtime->dma_bytes;

	idma_setcallbk(substream, idma_done);

	return 0;
}

static int idma_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);

	return 0;
}

static int idma_prepare(struct snd_pcm_substream *substream)
{
	struct idma_ctrl *prtd = substream->runtime->private_data;

	prtd->pos = prtd->start;

	/* flush the DMA channel */
	idma_control(LPAM_DMA_STOP);
	idma_enqueue(substream);

	return 0;
}

static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct idma_ctrl *prtd = substream->runtime->private_data;
	int ret = 0;

	spin_lock(&prtd->lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		prtd->state |= ST_RUNNING;
		idma_control(LPAM_DMA_START);
		break;

	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		prtd->state &= ~ST_RUNNING;
		idma_control(LPAM_DMA_STOP);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock(&prtd->lock);

	return ret;
}

static snd_pcm_uframes_t
	idma_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd = runtime->private_data;
	dma_addr_t src;
	unsigned long res;

	spin_lock(&prtd->lock);

	idma_getpos(&src);
	res = src - prtd->start;

	spin_unlock(&prtd->lock);

	return bytes_to_frames(substream->runtime, res);
}

static int idma_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long size, offset;
	int ret;

	/* From snd_pcm_lib_mmap_iomem */
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	vma->vm_flags |= VM_IO;
	size = vma->vm_end - vma->vm_start;
	offset = vma->vm_pgoff << PAGE_SHIFT;
	ret = io_remap_pfn_range(vma, vma->vm_start,
			(runtime->dma_addr + offset) >> PAGE_SHIFT,
			size, vma->vm_page_prot);

	return ret;
}

static irqreturn_t iis_irq(int irqno, void *dev_id)
{
	struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;
	u32 iiscon, iisahb, val, addr;

	iisahb  = readl(idma.regs + I2SAHB);
	iiscon  = readl(idma.regs + I2SCON);

	val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;

	if (val) {
		iisahb |= val;
		writel(iisahb, idma.regs + I2SAHB);

		addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
		addr += prtd->periodsz;
		addr %= (prtd->end - prtd->start);
		addr += idma.lp_tx_addr;

		writel(addr, idma.regs + I2SLVL0ADDR);

		if (prtd->cb)
			prtd->cb(prtd->token, prtd->period);
	}

	return IRQ_HANDLED;
}

static int idma_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd;
	int ret;

	snd_soc_set_runtime_hwparams(substream, &idma_hardware);

	prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
	if (ret < 0) {
		pr_err("fail to claim i2s irq , ret = %d\n", ret);
		kfree(prtd);
		return ret;
	}

	spin_lock_init(&prtd->lock);

	runtime->private_data = prtd;

	return 0;
}

static int idma_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd = runtime->private_data;

	free_irq(IRQ_I2S0, prtd);

	if (!prtd)
		pr_err("idma_close called with prtd == NULL\n");

	kfree(prtd);

	return 0;
}

static struct snd_pcm_ops idma_ops = {
	.open		= idma_open,
	.close		= idma_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.trigger	= idma_trigger,
	.pointer	= idma_pointer,
	.mmap		= idma_mmap,
	.hw_params	= idma_hw_params,
	.hw_free	= idma_hw_free,
	.prepare	= idma_prepare,
};

static void idma_free(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;

	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
	if (!substream)
		return;

	buf = &substream->dma_buffer;
	if (!buf->area)
		return;

	iounmap(buf->area);

	buf->area = NULL;
	buf->addr = 0;
}

static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;

	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;

	/* Assign PCM buffer pointers */
	buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
	buf->addr = idma.lp_tx_addr;
	buf->bytes = idma_hardware.buffer_bytes_max;
	buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);

	return 0;
}

static u64 idma_mask = DMA_BIT_MASK(32);

static int idma_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &idma_mask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	if (dai->driver->playback.channels_min)
		ret = preallocate_idma_buffer(pcm,
				SNDRV_PCM_STREAM_PLAYBACK);

	return ret;
}

void idma_reg_addr_init(void *regs, dma_addr_t addr)
{
	spin_lock_init(&idma.lock);
	idma.regs = regs;
	idma.lp_tx_addr = addr;
}

struct snd_soc_platform_driver asoc_idma_platform = {
	.ops = &idma_ops,
	.pcm_new = idma_new,
	.pcm_free = idma_free,
};

static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
}

static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver asoc_idma_driver = {
	.driver = {
		.name = "samsung-idma",
		.owner = THIS_MODULE,
	},

	.probe = asoc_idma_platform_probe,
	.remove = __devexit_p(asoc_idma_platform_remove),
};

static int __init asoc_idma_init(void)
{
	return platform_driver_register(&asoc_idma_driver);
}
module_init(asoc_idma_init);

static void __exit asoc_idma_exit(void)
{
	platform_driver_unregister(&asoc_idma_driver);
}
module_exit(asoc_idma_exit);

MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f09aecd5 SK	1	/*
	2	* sound/soc/samsung/idma.c
	3	*
	4	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com
	6	*
	7	* I2S0's Internal DMA driver
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*/
	14	#include <linux/interrupt.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/dma-mapping.h>
	17	#include <linux/slab.h>
da155d5b	18	#include <linux/module.h>
f09aecd5 SK	19	#include <sound/pcm.h>
	20	#include <sound/pcm_params.h>
	21	#include <sound/soc.h>
	22
	23	#include "i2s.h"
	24	#include "idma.h"
	25	#include "dma.h"
	26	#include "i2s-regs.h"
	27
	28	#define ST_RUNNING (1<<0)
	29	#define ST_OPENED (1<<1)
	30
	31	static const struct snd_pcm_hardware idma_hardware = {
	32	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	33	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	34	SNDRV_PCM_INFO_MMAP \|
	35	SNDRV_PCM_INFO_MMAP_VALID \|
	36	SNDRV_PCM_INFO_PAUSE \|
	37	SNDRV_PCM_INFO_RESUME,
	38	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	39	SNDRV_PCM_FMTBIT_U16_LE \|
	40	SNDRV_PCM_FMTBIT_S24_LE \|
	41	SNDRV_PCM_FMTBIT_U24_LE \|
	42	SNDRV_PCM_FMTBIT_U8 \|
	43	SNDRV_PCM_FMTBIT_S8,
	44	.channels_min = 2,
	45	.channels_max = 2,
	46	.buffer_bytes_max = MAX_IDMA_BUFFER,
	47	.period_bytes_min = 128,
	48	.period_bytes_max = MAX_IDMA_PERIOD,
	49	.periods_min = 1,
	50	.periods_max = 2,
	51	};
	52
	53	struct idma_ctrl {
	54	spinlock_t lock;
	55	int state;
	56	dma_addr_t start;
	57	dma_addr_t pos;
	58	dma_addr_t end;
	59	dma_addr_t period;
	60	dma_addr_t periodsz;
	61	void *token;
	62	void (cb)(void dt, int bytes_xfer);
	63	};
	64
	65	static struct idma_info {
	66	spinlock_t lock;
	67	void __iomem *regs;
	68	dma_addr_t lp_tx_addr;
	69	} idma;
	70
	71	static void idma_getpos(dma_addr_t *src)
	72	{
	73	*src = idma.lp_tx_addr +
	74	(readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;
	75	}
	76
	77	static int idma_enqueue(struct snd_pcm_substream *substream)
	78	{
	79	struct snd_pcm_runtime *runtime = substream->runtime;
	80	struct idma_ctrl *prtd = substream->runtime->private_data;
	81	u32 val;
	82
83	spin_lock(&prtd->lock);
84	prtd->token = (void *) substream;
85	spin_unlock(&prtd->lock);
86
87	/* Internal DMA Level0 Interrupt Address */
88	val = idma.lp_tx_addr + prtd->periodsz;
89	writel(val, idma.regs + I2SLVL0ADDR);
90
91	/* Start address0 of I2S internal DMA operation. */
92	val = idma.lp_tx_addr;
93	writel(val, idma.regs + I2SSTR0);
94
95	/*
96	* Transfer block size for I2S internal DMA.
97	* Should decide transfer size before start dma operation
98	*/
99	val = readl(idma.regs + I2SSIZE);
100	val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);
101	val \|= (((runtime->dma_bytes >> 2) &
102	I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);
103	writel(val, idma.regs + I2SSIZE);
104
105	val = readl(idma.regs + I2SAHB);
106	val \|= AHB_INTENLVL0;
107	writel(val, idma.regs + I2SAHB);
108
109	return 0;
110	}
111
112	static void idma_setcallbk(struct snd_pcm_substream *substream,
113	void (cb)(void , int))
114	{
115	struct idma_ctrl *prtd = substream->runtime->private_data;
116
117	spin_lock(&prtd->lock);
118	prtd->cb = cb;
119	spin_unlock(&prtd->lock);
120	}
121
122	static void idma_control(int op)
123	{
124	u32 val = readl(idma.regs + I2SAHB);
125
126	spin_lock(&idma.lock);
127
128	switch (op) {
129	case LPAM_DMA_START:
130	val \|= (AHB_INTENLVL0 \| AHB_DMAEN);
131	break;
132	case LPAM_DMA_STOP:
133	val &= ~(AHB_INTENLVL0 \| AHB_DMAEN);
134	break;
135	default:
136	spin_unlock(&idma.lock);
137	return;
138	}
139
140	writel(val, idma.regs + I2SAHB);
141	spin_unlock(&idma.lock);
142	}
143
144	static void idma_done(void *id, int bytes_xfer)
145	{
146	struct snd_pcm_substream *substream = id;
147	struct idma_ctrl *prtd = substream->runtime->private_data;
148
149	if (prtd && (prtd->state & ST_RUNNING))
150	snd_pcm_period_elapsed(substream);
151	}
152
153	static int idma_hw_params(struct snd_pcm_substream *substream,
154	struct snd_pcm_hw_params *params)
155	{
156	struct snd_pcm_runtime *runtime = substream->runtime;
157	struct idma_ctrl *prtd = substream->runtime->private_data;
158	u32 mod = readl(idma.regs + I2SMOD);
159	u32 ahb = readl(idma.regs + I2SAHB);
160
161	ahb \|= (AHB_DMARLD \| AHB_INTMASK);
162	mod \|= MOD_TXS_IDMA;
163	writel(ahb, idma.regs + I2SAHB);
164	writel(mod, idma.regs + I2SMOD);
165
166	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
167	runtime->dma_bytes = params_buffer_bytes(params);
168
169	prtd->start = prtd->pos = runtime->dma_addr;
170	prtd->period = params_periods(params);
171	prtd->periodsz = params_period_bytes(params);
172	prtd->end = runtime->dma_addr + runtime->dma_bytes;
173
174	idma_setcallbk(substream, idma_done);
175
176	return 0;
177	}
178
179	static int idma_hw_free(struct snd_pcm_substream *substream)
180	{
181	snd_pcm_set_runtime_buffer(substream, NULL);
182
183	return 0;
184	}
185
186	static int idma_prepare(struct snd_pcm_substream *substream)
187	{
188	struct idma_ctrl *prtd = substream->runtime->private_data;
189
190	prtd->pos = prtd->start;
191
192	/* flush the DMA channel */
193	idma_control(LPAM_DMA_STOP);
194	idma_enqueue(substream);
195
196	return 0;
197	}
198
199	static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
200	{
201	struct idma_ctrl *prtd = substream->runtime->private_data;
202	int ret = 0;
203
204	spin_lock(&prtd->lock);
205
206	switch (cmd) {
207	case SNDRV_PCM_TRIGGER_RESUME:
208	case SNDRV_PCM_TRIGGER_START:
209	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
210	prtd->state \|= ST_RUNNING;
211	idma_control(LPAM_DMA_START);
212	break;
213
214	case SNDRV_PCM_TRIGGER_SUSPEND:
215	case SNDRV_PCM_TRIGGER_STOP:
216	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
217	prtd->state &= ~ST_RUNNING;
218	idma_control(LPAM_DMA_STOP);
219	break;
220
221	default:
222	ret = -EINVAL;
223	break;
224	}
225
226	spin_unlock(&prtd->lock);
227
228	return ret;
229	}
230
231	static snd_pcm_uframes_t
232	idma_pointer(struct snd_pcm_substream *substream)
233	{
234	struct snd_pcm_runtime *runtime = substream->runtime;
235	struct idma_ctrl *prtd = runtime->private_data;
236	dma_addr_t src;
237	unsigned long res;
238
239	spin_lock(&prtd->lock);
240
241	idma_getpos(&src);
242	res = src - prtd->start;
243
244	spin_unlock(&prtd->lock);
245
246	return bytes_to_frames(substream->runtime, res);
247	}
248
249	static int idma_mmap(struct snd_pcm_substream *substream,
250	struct vm_area_struct *vma)
251	{
252	struct snd_pcm_runtime *runtime = substream->runtime;
253	unsigned long size, offset;
254	int ret;
255
256	/* From snd_pcm_lib_mmap_iomem */
257	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
258	vma->vm_flags \|= VM_IO;
259	size = vma->vm_end - vma->vm_start;
260	offset = vma->vm_pgoff << PAGE_SHIFT;
261	ret = io_remap_pfn_range(vma, vma->vm_start,
262	(runtime->dma_addr + offset) >> PAGE_SHIFT,
263	size, vma->vm_page_prot);
264
265	return ret;
266	}
267
268	static irqreturn_t iis_irq(int irqno, void *dev_id)
269	{
270	struct idma_ctrl prtd = (struct idma_ctrl )dev_id;
271	u32 iiscon, iisahb, val, addr;
272
273	iisahb = readl(idma.regs + I2SAHB);
274	iiscon = readl(idma.regs + I2SCON);
275
276	val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;
277
278	if (val) {
279	iisahb \|= val;
280	writel(iisahb, idma.regs + I2SAHB);
281
282	addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;
283	addr += prtd->periodsz;
284	addr %= (prtd->end - prtd->start);
285	addr += idma.lp_tx_addr;
286
287	writel(addr, idma.regs + I2SLVL0ADDR);
288
289	if (prtd->cb)
290	prtd->cb(prtd->token, prtd->period);
291	}
292
293	return IRQ_HANDLED;
294	}
295
296	static int idma_open(struct snd_pcm_substream *substream)
297	{
298	struct snd_pcm_runtime *runtime = substream->runtime;
299	struct idma_ctrl *prtd;
300	int ret;
301
302	snd_soc_set_runtime_hwparams(substream, &idma_hardware);
303
304	prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);
305	if (prtd == NULL)
306	return -ENOMEM;
307
308	ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);
309	if (ret < 0) {
310	pr_err("fail to claim i2s irq , ret = %d\n", ret);
311	kfree(prtd);
312	return ret;
313	}
314
315	spin_lock_init(&prtd->lock);
316
317	runtime->private_data = prtd;
318
319	return 0;
320	}
321
322	static int idma_close(struct snd_pcm_substream *substream)
323	{
324	struct snd_pcm_runtime *runtime = substream->runtime;
325	struct idma_ctrl *prtd = runtime->private_data;
326
327	free_irq(IRQ_I2S0, prtd);
328
329	if (!prtd)
330	pr_err("idma_close called with prtd == NULL\n");
331
332	kfree(prtd);
333
334	return 0;
335	}
336
337	static struct snd_pcm_ops idma_ops = {
338	.open = idma_open,
339	.close = idma_close,
340	.ioctl = snd_pcm_lib_ioctl,
341	.trigger = idma_trigger,
342	.pointer = idma_pointer,
343	.mmap = idma_mmap,
344	.hw_params = idma_hw_params,
345	.hw_free = idma_hw_free,
346	.prepare = idma_prepare,
347	};
348
349	static void idma_free(struct snd_pcm *pcm)
350	{
351	struct snd_pcm_substream *substream;
352	struct snd_dma_buffer *buf;
353
354	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
355	if (!substream)
356	return;
357
358	buf = &substream->dma_buffer;
359	if (!buf->area)
360	return;
361
362	iounmap(buf->area);
363
364	buf->area = NULL;
365	buf->addr = 0;
366	}
367
368	static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
369	{
370	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
371	struct snd_dma_buffer *buf = &substream->dma_buffer;
372
373	buf->dev.dev = pcm->card->dev;
374	buf->private_data = NULL;
375
376	/* Assign PCM buffer pointers */
377	buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;
378	buf->addr = idma.lp_tx_addr;
379	buf->bytes = idma_hardware.buffer_bytes_max;
380	buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);
381
382	return 0;
383	}
384
385	static u64 idma_mask = DMA_BIT_MASK(32);
386
387	static int idma_new(struct snd_soc_pcm_runtime *rtd)
388	{
389	struct snd_card *card = rtd->card->snd_card;
390	struct snd_soc_dai *dai = rtd->cpu_dai;
391	struct snd_pcm *pcm = rtd->pcm;
392	int ret = 0;
393
394	if (!card->dev->dma_mask)
395	card->dev->dma_mask = &idma_mask;
396	if (!card->dev->coherent_dma_mask)
397	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
398
399	if (dai->driver->playback.channels_min)
400	ret = preallocate_idma_buffer(pcm,
401	SNDRV_PCM_STREAM_PLAYBACK);
402
403	return ret;
404	}
405
406	void idma_reg_addr_init(void *regs, dma_addr_t addr)
407	{
408	spin_lock_init(&idma.lock);
409	idma.regs = regs;
410	idma.lp_tx_addr = addr;
411	}
412
413	struct snd_soc_platform_driver asoc_idma_platform = {
414	.ops = &idma_ops,
415	.pcm_new = idma_new,
416	.pcm_free = idma_free,
417	};
418
419	static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)
420	{
421	return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);
422	}
423
424	static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)
425	{
426	snd_soc_unregister_platform(&pdev->dev);
427	return 0;
428	}
429
430	static struct platform_driver asoc_idma_driver = {
431	.driver = {
432	.name = "samsung-idma",
433	.owner = THIS_MODULE,
434	},
435
436	.probe = asoc_idma_platform_probe,
437	.remove = __devexit_p(asoc_idma_platform_remove),
438	};
439
440	static int __init asoc_idma_init(void)
441	{
442	return platform_driver_register(&asoc_idma_driver);
443	}
444	module_init(asoc_idma_init);
445
446	static void __exit asoc_idma_exit(void)
447	{
448	platform_driver_unregister(&asoc_idma_driver);
449	}
450	module_exit(asoc_idma_exit);
451
452	MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
453	MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");
454	MODULE_LICENSE("GPL");