1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * linux/sound/soc/pxa/mmp-pcm.c
  4 *
  5 * Copyright (C) 2011 Marvell International Ltd.
  6 */
  7#include <linux/module.h>
  8#include <linux/init.h>
  9#include <linux/platform_device.h>
 10#include <linux/slab.h>
 11#include <linux/dma-mapping.h>
 12#include <linux/dmaengine.h>
 13#include <linux/platform_data/dma-mmp_tdma.h>
 14#include <linux/platform_data/mmp_audio.h>
 15
 16#include <sound/pxa2xx-lib.h>
 17#include <sound/core.h>
 18#include <sound/pcm.h>
 19#include <sound/pcm_params.h>
 20#include <sound/soc.h>
 21#include <sound/dmaengine_pcm.h>
 22
 23#define DRV_NAME "mmp-pcm"
 24
 25struct mmp_dma_data {
 26	int ssp_id;
 27	struct resource *dma_res;
 28};
 29
 30#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |	\
 31		SNDRV_PCM_INFO_MMAP_VALID |	\
 32		SNDRV_PCM_INFO_INTERLEAVED |	\
 33		SNDRV_PCM_INFO_PAUSE |		\
 34		SNDRV_PCM_INFO_RESUME |		\
 35		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
 36
 37static struct snd_pcm_hardware mmp_pcm_hardware[] = {
 38	{
 39		.info			= MMP_PCM_INFO,
 40		.period_bytes_min	= 1024,
 41		.period_bytes_max	= 2048,
 42		.periods_min		= 2,
 43		.periods_max		= 32,
 44		.buffer_bytes_max	= 4096,
 45		.fifo_size		= 32,
 46	},
 47	{
 48		.info			= MMP_PCM_INFO,
 49		.period_bytes_min	= 1024,
 50		.period_bytes_max	= 2048,
 51		.periods_min		= 2,
 52		.periods_max		= 32,
 53		.buffer_bytes_max	= 4096,
 54		.fifo_size		= 32,
 55	},
 56};
 57
 58static int mmp_pcm_hw_params(struct snd_soc_component *component,
 59			     struct snd_pcm_substream *substream,
 60			     struct snd_pcm_hw_params *params)
 61{
 62	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 63	struct dma_slave_config slave_config;
 64	int ret;
 65
 66	ret =
 67	    snd_dmaengine_pcm_prepare_slave_config(substream, params,
 68						   &slave_config);
 69	if (ret)
 70		return ret;
 71
 72	ret = dmaengine_slave_config(chan, &slave_config);
 73	if (ret)
 74		return ret;
 75
 76	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 77
 78	return 0;
 79}
 80
 81static int mmp_pcm_trigger(struct snd_soc_component *component,
 82			   struct snd_pcm_substream *substream, int cmd)
 83{
 84	return snd_dmaengine_pcm_trigger(substream, cmd);
 85}
 86
 87static snd_pcm_uframes_t mmp_pcm_pointer(struct snd_soc_component *component,
 88					 struct snd_pcm_substream *substream)
 89{
 90	return snd_dmaengine_pcm_pointer(substream);
 91}
 92
 93static bool filter(struct dma_chan *chan, void *param)
 94{
 95	struct mmp_dma_data *dma_data = param;
 96	bool found = false;
 97	char *devname;
 98
 99	devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
100		dma_data->ssp_id);
101	if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
102		(chan->chan_id == dma_data->dma_res->start)) {
103		found = true;
104	}
105
106	kfree(devname);
107	return found;
108}
109
110static int mmp_pcm_open(struct snd_soc_component *component,
111			struct snd_pcm_substream *substream)
112{
113	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
114	struct platform_device *pdev = to_platform_device(component->dev);
115	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
116	struct mmp_dma_data dma_data;
117	struct resource *r;
118
119	r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
120	if (!r)
121		return -EBUSY;
122
123	snd_soc_set_runtime_hwparams(substream,
124				&mmp_pcm_hardware[substream->stream]);
125
126	dma_data.dma_res = r;
127	dma_data.ssp_id = cpu_dai->id;
128
129	return snd_dmaengine_pcm_open_request_chan(substream, filter,
130		    &dma_data);
131}
132
133static int mmp_pcm_close(struct snd_soc_component *component,
134			 struct snd_pcm_substream *substream)
135{
136	return snd_dmaengine_pcm_close_release_chan(substream);
137}
138
139static int mmp_pcm_mmap(struct snd_soc_component *component,
140			struct snd_pcm_substream *substream,
141			struct vm_area_struct *vma)
142{
143	struct snd_pcm_runtime *runtime = substream->runtime;
144	unsigned long off = vma->vm_pgoff;
145
146	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
147	return remap_pfn_range(vma, vma->vm_start,
148		__phys_to_pfn(runtime->dma_addr) + off,
149		vma->vm_end - vma->vm_start, vma->vm_page_prot);
150}
151
152static void mmp_pcm_free_dma_buffers(struct snd_soc_component *component,
153				     struct snd_pcm *pcm)
154{
155	struct snd_pcm_substream *substream;
156	struct snd_dma_buffer *buf;
157	int stream;
158	struct gen_pool *gpool;
159
160	gpool = sram_get_gpool("asram");
161	if (!gpool)
162		return;
163
164	for (stream = 0; stream < 2; stream++) {
165		size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
166
167		substream = pcm->streams[stream].substream;
168		if (!substream)
169			continue;
170
171		buf = &substream->dma_buffer;
172		if (!buf->area)
173			continue;
174		gen_pool_free(gpool, (unsigned long)buf->area, size);
175		buf->area = NULL;
176	}
177
178}
179
180static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
181								int stream)
182{
183	struct snd_dma_buffer *buf = &substream->dma_buffer;
184	size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
185	struct gen_pool *gpool;
186
187	buf->dev.type = SNDRV_DMA_TYPE_DEV;
188	buf->dev.dev = substream->pcm->card->dev;
189	buf->private_data = NULL;
190
191	gpool = sram_get_gpool("asram");
192	if (!gpool)
193		return -ENOMEM;
194
195	buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
196	if (!buf->area)
197		return -ENOMEM;
198	buf->bytes = size;
199	return 0;
200}
201
202static int mmp_pcm_new(struct snd_soc_component *component,
203		       struct snd_soc_pcm_runtime *rtd)
204{
205	struct snd_pcm_substream *substream;
206	struct snd_pcm *pcm = rtd->pcm;
207	int ret = 0, stream;
208
209	for (stream = 0; stream < 2; stream++) {
210		substream = pcm->streams[stream].substream;
211
212		ret = mmp_pcm_preallocate_dma_buffer(substream,	stream);
213		if (ret)
214			goto err;
215	}
216
217	return 0;
218
219err:
220	mmp_pcm_free_dma_buffers(component, pcm);
221	return ret;
222}
223
224static const struct snd_soc_component_driver mmp_soc_component = {
225	.name		= DRV_NAME,
226	.open		= mmp_pcm_open,
227	.close		= mmp_pcm_close,
228	.hw_params	= mmp_pcm_hw_params,
229	.trigger	= mmp_pcm_trigger,
230	.pointer	= mmp_pcm_pointer,
231	.mmap		= mmp_pcm_mmap,
232	.pcm_construct	= mmp_pcm_new,
233	.pcm_destruct	= mmp_pcm_free_dma_buffers,
234};
235
236static int mmp_pcm_probe(struct platform_device *pdev)
237{
238	struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
239
240	if (pdata) {
241		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
242						pdata->buffer_max_playback;
243		mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
244						pdata->period_max_playback;
245		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
246						pdata->buffer_max_capture;
247		mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
248						pdata->period_max_capture;
249	}
250	return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
251					       NULL, 0);
252}
253
254static struct platform_driver mmp_pcm_driver = {
255	.driver = {
256		.name = "mmp-pcm-audio",
257	},
258
259	.probe = mmp_pcm_probe,
260};
261
262module_platform_driver(mmp_pcm_driver);
263
264MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
265MODULE_DESCRIPTION("MMP Soc Audio DMA module");
266MODULE_LICENSE("GPL");
267MODULE_ALIAS("platform:mmp-pcm-audio");