[deliverable/linux.git] / sound / soc / imx / imx-pcm-dma-mx2.c

/*
 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This code is based on code copyrighted by Freescale,
 * Liam Girdwood, Javier Martin and probably others.
 *
 *  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/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <mach/dma-mx1-mx2.h>

#include "imx-ssi.h"

struct imx_pcm_runtime_data {
	int sg_count;
	struct scatterlist *sg_list;
	int period;
	int periods;
	unsigned long dma_addr;
	int dma;
	struct snd_pcm_substream *substream;
	unsigned long offset;
	unsigned long size;
	unsigned long period_cnt;
	void *buf;
	int period_time;
};

/* Called by the DMA framework when a period has elapsed */
static void imx_ssi_dma_progression(int channel, void *data,
					struct scatterlist *sg)
{
	struct snd_pcm_substream *substream = data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	if (!sg)
		return;

	runtime = iprtd->substream->runtime;

	iprtd->offset = sg->dma_address - runtime->dma_addr;

	snd_pcm_period_elapsed(iprtd->substream);
}

static void imx_ssi_dma_callback(int channel, void *data)
{
	pr_err("%s shouldn't be called\n", __func__);
}

static void snd_imx_dma_err_callback(int channel, void *data, int err)
{
	pr_err("DMA error callback called\n");

	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
		 channel,
		 err & IMX_DMA_ERR_BURST ?    " burst" : "",
		 err & IMX_DMA_ERR_REQUEST ?  " request" : "",
		 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
		 err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
}

static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int ret;

	dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);

	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
	if (iprtd->dma < 0) {
		pr_err("Failed to claim the audio DMA\n");
		return -ENODEV;
	}

	ret = imx_dma_setup_handlers(iprtd->dma,
				imx_ssi_dma_callback,
				snd_imx_dma_err_callback, substream);
	if (ret)
		goto out;

	ret = imx_dma_setup_progression_handler(iprtd->dma,
			imx_ssi_dma_progression);
	if (ret) {
		pr_err("Failed to setup the DMA handler\n");
		goto out;
	}

	ret = imx_dma_config_channel(iprtd->dma,
			IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
			IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
			dma_params->dma, 1);
	if (ret < 0) {
		pr_err("Cannot configure DMA channel: %d\n", ret);
		goto out;
	}

	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);

	return 0;
out:
	imx_dma_free(iprtd->dma);
	return ret;
}

static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int i;
	unsigned long dma_addr;

	imx_ssi_dma_alloc(substream);

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period = params_period_bytes(params);
	iprtd->offset = 0;
	iprtd->period_time = HZ / (params_rate(params) /
			params_period_size(params));

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	if (iprtd->sg_count != iprtd->periods) {
		kfree(iprtd->sg_list);

		iprtd->sg_list = kcalloc(iprtd->periods + 1,
				sizeof(struct scatterlist), GFP_KERNEL);
		if (!iprtd->sg_list)
			return -ENOMEM;
		iprtd->sg_count = iprtd->periods + 1;
	}

	sg_init_table(iprtd->sg_list, iprtd->sg_count);
	dma_addr = runtime->dma_addr;

	for (i = 0; i < iprtd->periods; i++) {
		iprtd->sg_list[i].page_link = 0;
		iprtd->sg_list[i].offset = 0;
		iprtd->sg_list[i].dma_address = dma_addr;
		iprtd->sg_list[i].length = iprtd->period;
		dma_addr += iprtd->period;
	}

	/* close the loop */
	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
	iprtd->sg_list[iprtd->sg_count - 1].page_link =
			((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
	return 0;
}

static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	if (iprtd->dma >= 0) {
		imx_dma_free(iprtd->dma);
		iprtd->dma = -EINVAL;
	}

	kfree(iprtd->sg_list);
	iprtd->sg_list = NULL;

	return 0;
}

static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int err;

	dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);

	iprtd->substream = substream;
	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	iprtd->period_cnt = 0;

	pr_debug("%s: buf: %p period: %d periods: %d\n",
			__func__, iprtd->buf, iprtd->period, iprtd->periods);

	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_MODE_WRITE : DMA_MODE_READ);
	if (err)
		return err;

	return 0;
}

static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		imx_dma_enable(iprtd->dma);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		imx_dma_disable(iprtd->dma);

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	return bytes_to_frames(substream->runtime, iprtd->offset);
}

static struct snd_pcm_hardware snd_imx_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,
	.rate_min = 8000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	.period_bytes_min = 128,
	.period_bytes_max = 16 * 1024,
	.periods_min = 2,
	.periods_max = 255,
	.fifo_size = 0,
};

static int snd_imx_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd;
	int ret;

	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
	runtime->private_data = iprtd;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
			SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		return ret;

	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	return 0;
}

static struct snd_pcm_ops imx_pcm_ops = {
	.open		= snd_imx_open,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= snd_imx_pcm_hw_params,
	.hw_free	= snd_imx_pcm_hw_free,
	.prepare	= snd_imx_pcm_prepare,
	.trigger	= snd_imx_pcm_trigger,
	.pointer	= snd_imx_pcm_pointer,
	.mmap		= snd_imx_pcm_mmap,
};

static struct snd_soc_platform imx_soc_platform_dma = {
	.name		= "imx-audio",
	.pcm_ops 	= &imx_pcm_ops,
	.pcm_new	= imx_pcm_new,
	.pcm_free	= imx_pcm_free,
};

struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
		struct imx_ssi *ssi)
{
	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;

	return &imx_soc_platform_dma;
}
Commit	Line	Data
8380222e SH	1	/*
	2	* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
	3	*
	4	* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
	5	*
	6	* This code is based on code copyrighted by Freescale,
	7	* Liam Girdwood, Javier Martin and probably others.
	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/clk.h>
	15	#include <linux/delay.h>
	16	#include <linux/device.h>
	17	#include <linux/dma-mapping.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
	22
	23	#include <sound/core.h>
	24	#include <sound/initval.h>
	25	#include <sound/pcm.h>
	26	#include <sound/pcm_params.h>
	27	#include <sound/soc.h>
	28
	29	#include <mach/dma-mx1-mx2.h>
	30
	31	#include "imx-ssi.h"
	32
	33	struct imx_pcm_runtime_data {
	34	int sg_count;
	35	struct scatterlist *sg_list;
	36	int period;
	37	int periods;
	38	unsigned long dma_addr;
	39	int dma;
	40	struct snd_pcm_substream *substream;
	41	unsigned long offset;
	42	unsigned long size;
	43	unsigned long period_cnt;
	44	void *buf;
	45	int period_time;
	46	};
	47
	48	/* Called by the DMA framework when a period has elapsed */
	49	static void imx_ssi_dma_progression(int channel, void *data,
	50	struct scatterlist *sg)
	51	{
	52	struct snd_pcm_substream *substream = data;
	53	struct snd_pcm_runtime *runtime = substream->runtime;
	54	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	55
	56	if (!sg)
	57	return;
	58
	59	runtime = iprtd->substream->runtime;
	60
	61	iprtd->offset = sg->dma_address - runtime->dma_addr;
	62
	63	snd_pcm_period_elapsed(iprtd->substream);
	64	}
65
66	static void imx_ssi_dma_callback(int channel, void *data)
67	{
68	pr_err("%s shouldn't be called\n", __func__);
69	}
70
71	static void snd_imx_dma_err_callback(int channel, void *data, int err)
72	{
73	pr_err("DMA error callback called\n");
74
75	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
76	channel,
77	err & IMX_DMA_ERR_BURST ? " burst" : "",
78	err & IMX_DMA_ERR_REQUEST ? " request" : "",
79	err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
80	err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
81	}
82
83	static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
84	{
85	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	86	struct imx_pcm_dma_params *dma_params;
8380222e SH	87	struct snd_pcm_runtime *runtime = substream->runtime;
	88	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	89	int ret;
	90
5f712b2b DM	91	dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
5f712b2b DM	92
8380222e SH	93	iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
	94	if (iprtd->dma < 0) {
	95	pr_err("Failed to claim the audio DMA\n");
	96	return -ENODEV;
	97	}
	98
	99	ret = imx_dma_setup_handlers(iprtd->dma,
	100	imx_ssi_dma_callback,
	101	snd_imx_dma_err_callback, substream);
	102	if (ret)
	103	goto out;
	104
	105	ret = imx_dma_setup_progression_handler(iprtd->dma,
	106	imx_ssi_dma_progression);
	107	if (ret) {
	108	pr_err("Failed to setup the DMA handler\n");
	109	goto out;
	110	}
	111
	112	ret = imx_dma_config_channel(iprtd->dma,
	113	IMX_DMA_MEMSIZE_16 \| IMX_DMA_TYPE_FIFO,
	114	IMX_DMA_MEMSIZE_32 \| IMX_DMA_TYPE_LINEAR,
	115	dma_params->dma, 1);
	116	if (ret < 0) {
	117	pr_err("Cannot configure DMA channel: %d\n", ret);
	118	goto out;
	119	}
	120
	121	imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
	122
	123	return 0;
	124	out:
	125	imx_dma_free(iprtd->dma);
	126	return ret;
	127	}
	128
	129	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	130	struct snd_pcm_hw_params *params)
	131	{
	132	struct snd_pcm_runtime *runtime = substream->runtime;
	133	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	134	int i;
	135	unsigned long dma_addr;
	136
	137	imx_ssi_dma_alloc(substream);
	138
	139	iprtd->size = params_buffer_bytes(params);
	140	iprtd->periods = params_periods(params);
	141	iprtd->period = params_period_bytes(params);
	142	iprtd->offset = 0;
	143	iprtd->period_time = HZ / (params_rate(params) /
	144	params_period_size(params));
	145
	146	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	147
	148	if (iprtd->sg_count != iprtd->periods) {
	149	kfree(iprtd->sg_list);
	150
	151	iprtd->sg_list = kcalloc(iprtd->periods + 1,
	152	sizeof(struct scatterlist), GFP_KERNEL);
	153	if (!iprtd->sg_list)
	154	return -ENOMEM;
	155	iprtd->sg_count = iprtd->periods + 1;
	156	}
157
158	sg_init_table(iprtd->sg_list, iprtd->sg_count);
159	dma_addr = runtime->dma_addr;
160
161	for (i = 0; i < iprtd->periods; i++) {
162	iprtd->sg_list[i].page_link = 0;
163	iprtd->sg_list[i].offset = 0;
164	iprtd->sg_list[i].dma_address = dma_addr;
165	iprtd->sg_list[i].length = iprtd->period;
166	dma_addr += iprtd->period;
167	}
168
169	/* close the loop */
170	iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
171	iprtd->sg_list[iprtd->sg_count - 1].length = 0;
172	iprtd->sg_list[iprtd->sg_count - 1].page_link =
173	((unsigned long) iprtd->sg_list \| 0x01) & ~0x02;
174	return 0;
175	}
176
177	static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
178	{
179	struct snd_pcm_runtime *runtime = substream->runtime;
180	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
181
182	if (iprtd->dma >= 0) {
183	imx_dma_free(iprtd->dma);
184	iprtd->dma = -EINVAL;
185	}
186
187	kfree(iprtd->sg_list);
188	iprtd->sg_list = NULL;
189
190	return 0;
191	}
192
193	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
194	{
195	struct snd_pcm_runtime *runtime = substream->runtime;
196	struct snd_soc_pcm_runtime *rtd = substream->private_data;
5f712b2b	197	struct imx_pcm_dma_params *dma_params;
8380222e SH	198	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	199	int err;
	200
5f712b2b DM	201	dma_params = snd_soc_get_dma_data(rtd->dai->cpu_dai, substream);
5f712b2b DM	202
8380222e SH	203	iprtd->substream = substream;
	204	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	205	iprtd->period_cnt = 0;
	206
	207	pr_debug("%s: buf: %p period: %d periods: %d\n",
	208	__func__, iprtd->buf, iprtd->period, iprtd->periods);
	209
	210	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
	211	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
	212	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
	213	DMA_MODE_WRITE : DMA_MODE_READ);
	214	if (err)
	215	return err;
	216
	217	return 0;
	218	}
	219
	220	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	221	{
	222	struct snd_pcm_runtime *runtime = substream->runtime;
	223	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	224
	225	switch (cmd) {
	226	case SNDRV_PCM_TRIGGER_START:
	227	case SNDRV_PCM_TRIGGER_RESUME:
	228	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	229	imx_dma_enable(iprtd->dma);
	230
	231	break;
	232
	233	case SNDRV_PCM_TRIGGER_STOP:
	234	case SNDRV_PCM_TRIGGER_SUSPEND:
	235	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	236	imx_dma_disable(iprtd->dma);
	237
	238	break;
	239	default:
	240	return -EINVAL;
	241	}
	242
	243	return 0;
	244	}
	245
	246	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	247	{
	248	struct snd_pcm_runtime *runtime = substream->runtime;
	249	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	250
	251	return bytes_to_frames(substream->runtime, iprtd->offset);
	252	}
	253
	254	static struct snd_pcm_hardware snd_imx_hardware = {
	255	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	256	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	257	SNDRV_PCM_INFO_MMAP \|
	258	SNDRV_PCM_INFO_MMAP_VALID \|
	259	SNDRV_PCM_INFO_PAUSE \|
	260	SNDRV_PCM_INFO_RESUME,
	261	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	262	.rate_min = 8000,
	263	.channels_min = 2,
	264	.channels_max = 2,
	265	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	266	.period_bytes_min = 128,
267	.period_bytes_max = 16 * 1024,
268	.periods_min = 2,
269	.periods_max = 255,
270	.fifo_size = 0,
271	};
272
273	static int snd_imx_open(struct snd_pcm_substream *substream)
274	{
275	struct snd_pcm_runtime *runtime = substream->runtime;
276	struct imx_pcm_runtime_data *iprtd;
277	int ret;
278
279	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
280	runtime->private_data = iprtd;
281
282	ret = snd_pcm_hw_constraint_integer(substream->runtime,
283	SNDRV_PCM_HW_PARAM_PERIODS);
284	if (ret < 0)
285	return ret;
286
287	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
288	return 0;
289	}
290
291	static struct snd_pcm_ops imx_pcm_ops = {
292	.open = snd_imx_open,
293	.ioctl = snd_pcm_lib_ioctl,
294	.hw_params = snd_imx_pcm_hw_params,
295	.hw_free = snd_imx_pcm_hw_free,
296	.prepare = snd_imx_pcm_prepare,
297	.trigger = snd_imx_pcm_trigger,
298	.pointer = snd_imx_pcm_pointer,
299	.mmap = snd_imx_pcm_mmap,
300	};
301
302	static struct snd_soc_platform imx_soc_platform_dma = {
303	.name = "imx-audio",
304	.pcm_ops = &imx_pcm_ops,
305	.pcm_new = imx_pcm_new,
306	.pcm_free = imx_pcm_free,
307	};
308
309	struct snd_soc_platform imx_ssi_dma_mx2_init(struct platform_device pdev,
310	struct imx_ssi *ssi)
311	{
312	ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
313	ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
314
315	return &imx_soc_platform_dma;
316	}
317