xref: /openbmc/linux/sound/arm/pxa2xx-pcm-lib.c (revision 4800cd83)
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License version 2 as
4  * published by the Free Software Foundation.
5  */
6 
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/dma-mapping.h>
10 
11 #include <sound/core.h>
12 #include <sound/pcm.h>
13 #include <sound/pcm_params.h>
14 #include <sound/pxa2xx-lib.h>
15 
16 #include <mach/dma.h>
17 
18 #include "pxa2xx-pcm.h"
19 
20 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
21 	.info			= SNDRV_PCM_INFO_MMAP |
22 				  SNDRV_PCM_INFO_MMAP_VALID |
23 				  SNDRV_PCM_INFO_INTERLEAVED |
24 				  SNDRV_PCM_INFO_PAUSE |
25 				  SNDRV_PCM_INFO_RESUME,
26 	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
27 					SNDRV_PCM_FMTBIT_S24_LE |
28 					SNDRV_PCM_FMTBIT_S32_LE,
29 	.period_bytes_min	= 32,
30 	.period_bytes_max	= 8192 - 32,
31 	.periods_min		= 1,
32 	.periods_max		= PAGE_SIZE/sizeof(pxa_dma_desc),
33 	.buffer_bytes_max	= 128 * 1024,
34 	.fifo_size		= 32,
35 };
36 
37 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
38 				struct snd_pcm_hw_params *params)
39 {
40 	struct snd_pcm_runtime *runtime = substream->runtime;
41 	struct pxa2xx_runtime_data *rtd = runtime->private_data;
42 	size_t totsize = params_buffer_bytes(params);
43 	size_t period = params_period_bytes(params);
44 	pxa_dma_desc *dma_desc;
45 	dma_addr_t dma_buff_phys, next_desc_phys;
46 
47 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
48 	runtime->dma_bytes = totsize;
49 
50 	dma_desc = rtd->dma_desc_array;
51 	next_desc_phys = rtd->dma_desc_array_phys;
52 	dma_buff_phys = runtime->dma_addr;
53 	do {
54 		next_desc_phys += sizeof(pxa_dma_desc);
55 		dma_desc->ddadr = next_desc_phys;
56 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
57 			dma_desc->dsadr = dma_buff_phys;
58 			dma_desc->dtadr = rtd->params->dev_addr;
59 		} else {
60 			dma_desc->dsadr = rtd->params->dev_addr;
61 			dma_desc->dtadr = dma_buff_phys;
62 		}
63 		if (period > totsize)
64 			period = totsize;
65 		dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
66 		dma_desc++;
67 		dma_buff_phys += period;
68 	} while (totsize -= period);
69 	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
70 
71 	return 0;
72 }
73 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
74 
75 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
76 {
77 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
78 
79 	if (rtd && rtd->params && rtd->params->drcmr)
80 		*rtd->params->drcmr = 0;
81 
82 	snd_pcm_set_runtime_buffer(substream, NULL);
83 	return 0;
84 }
85 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
86 
87 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
88 {
89 	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
90 	int ret = 0;
91 
92 	switch (cmd) {
93 	case SNDRV_PCM_TRIGGER_START:
94 		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
95 		DCSR(prtd->dma_ch) = DCSR_RUN;
96 		break;
97 
98 	case SNDRV_PCM_TRIGGER_STOP:
99 	case SNDRV_PCM_TRIGGER_SUSPEND:
100 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
101 		DCSR(prtd->dma_ch) &= ~DCSR_RUN;
102 		break;
103 
104 	case SNDRV_PCM_TRIGGER_RESUME:
105 		DCSR(prtd->dma_ch) |= DCSR_RUN;
106 		break;
107 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
108 		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
109 		DCSR(prtd->dma_ch) |= DCSR_RUN;
110 		break;
111 
112 	default:
113 		ret = -EINVAL;
114 	}
115 
116 	return ret;
117 }
118 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
119 
120 snd_pcm_uframes_t
121 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
122 {
123 	struct snd_pcm_runtime *runtime = substream->runtime;
124 	struct pxa2xx_runtime_data *prtd = runtime->private_data;
125 
126 	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
127 			 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
128 	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
129 
130 	if (x == runtime->buffer_size)
131 		x = 0;
132 	return x;
133 }
134 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
135 
136 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
137 {
138 	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
139 
140 	if (!prtd || !prtd->params)
141 		return 0;
142 
143 	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
144 	DCSR(prtd->dma_ch) = 0;
145 	DCMD(prtd->dma_ch) = 0;
146 	*prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
147 
148 	return 0;
149 }
150 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
151 
152 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
153 {
154 	struct snd_pcm_substream *substream = dev_id;
155 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
156 	int dcsr;
157 
158 	dcsr = DCSR(dma_ch);
159 	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
160 
161 	if (dcsr & DCSR_ENDINTR) {
162 		snd_pcm_period_elapsed(substream);
163 	} else {
164 		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
165 			rtd->params->name, dma_ch, dcsr);
166 		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
167 	}
168 }
169 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
170 
171 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
172 {
173 	struct snd_pcm_runtime *runtime = substream->runtime;
174 	struct pxa2xx_runtime_data *rtd;
175 	int ret;
176 
177 	runtime->hw = pxa2xx_pcm_hardware;
178 
179 	/*
180 	 * For mysterious reasons (and despite what the manual says)
181 	 * playback samples are lost if the DMA count is not a multiple
182 	 * of the DMA burst size.  Let's add a rule to enforce that.
183 	 */
184 	ret = snd_pcm_hw_constraint_step(runtime, 0,
185 		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
186 	if (ret)
187 		goto out;
188 
189 	ret = snd_pcm_hw_constraint_step(runtime, 0,
190 		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
191 	if (ret)
192 		goto out;
193 
194 	ret = snd_pcm_hw_constraint_integer(runtime,
195 					    SNDRV_PCM_HW_PARAM_PERIODS);
196 	if (ret < 0)
197 		goto out;
198 
199 	ret = -ENOMEM;
200 	rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
201 	if (!rtd)
202 		goto out;
203 	rtd->dma_desc_array =
204 		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
205 				       &rtd->dma_desc_array_phys, GFP_KERNEL);
206 	if (!rtd->dma_desc_array)
207 		goto err1;
208 
209 	rtd->dma_ch = -1;
210 	runtime->private_data = rtd;
211 	return 0;
212 
213  err1:
214 	kfree(rtd);
215  out:
216 	return ret;
217 }
218 EXPORT_SYMBOL(__pxa2xx_pcm_open);
219 
220 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
221 {
222 	struct snd_pcm_runtime *runtime = substream->runtime;
223 	struct pxa2xx_runtime_data *rtd = runtime->private_data;
224 
225 	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
226 			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
227 	kfree(rtd);
228 	return 0;
229 }
230 EXPORT_SYMBOL(__pxa2xx_pcm_close);
231 
232 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
233 	struct vm_area_struct *vma)
234 {
235 	struct snd_pcm_runtime *runtime = substream->runtime;
236 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
237 				     runtime->dma_area,
238 				     runtime->dma_addr,
239 				     runtime->dma_bytes);
240 }
241 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
242 
243 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
244 {
245 	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
246 	struct snd_dma_buffer *buf = &substream->dma_buffer;
247 	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
248 	buf->dev.type = SNDRV_DMA_TYPE_DEV;
249 	buf->dev.dev = pcm->card->dev;
250 	buf->private_data = NULL;
251 	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
252 					   &buf->addr, GFP_KERNEL);
253 	if (!buf->area)
254 		return -ENOMEM;
255 	buf->bytes = size;
256 	return 0;
257 }
258 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
259 
260 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
261 {
262 	struct snd_pcm_substream *substream;
263 	struct snd_dma_buffer *buf;
264 	int stream;
265 
266 	for (stream = 0; stream < 2; stream++) {
267 		substream = pcm->streams[stream].substream;
268 		if (!substream)
269 			continue;
270 		buf = &substream->dma_buffer;
271 		if (!buf->area)
272 			continue;
273 		dma_free_writecombine(pcm->card->dev, buf->bytes,
274 				      buf->area, buf->addr);
275 		buf->area = NULL;
276 	}
277 }
278 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
279 
280 MODULE_AUTHOR("Nicolas Pitre");
281 MODULE_DESCRIPTION("Intel PXA2xx sound library");
282 MODULE_LICENSE("GPL");
283