xref: /openbmc/linux/sound/arm/pxa2xx-pcm-lib.c (revision 9ac8d3fb)
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/module.h>
8 #include <linux/dma-mapping.h>
9 
10 #include <sound/core.h>
11 #include <sound/pcm.h>
12 #include <sound/pcm_params.h>
13 #include <sound/pxa2xx-lib.h>
14 
15 #include <asm/dma.h>
16 #include <mach/pxa-regs.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)
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 	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
141 	DCSR(prtd->dma_ch) = 0;
142 	DCMD(prtd->dma_ch) = 0;
143 	*prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
144 
145 	return 0;
146 }
147 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
148 
149 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
150 {
151 	struct snd_pcm_substream *substream = dev_id;
152 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
153 	int dcsr;
154 
155 	dcsr = DCSR(dma_ch);
156 	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
157 
158 	if (dcsr & DCSR_ENDINTR) {
159 		snd_pcm_period_elapsed(substream);
160 	} else {
161 		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
162 			rtd->params->name, dma_ch, dcsr);
163 		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164 	}
165 }
166 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
167 
168 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
169 {
170 	struct snd_pcm_runtime *runtime = substream->runtime;
171 	struct pxa2xx_runtime_data *rtd;
172 	int ret;
173 
174 	runtime->hw = pxa2xx_pcm_hardware;
175 
176 	/*
177 	 * For mysterious reasons (and despite what the manual says)
178 	 * playback samples are lost if the DMA count is not a multiple
179 	 * of the DMA burst size.  Let's add a rule to enforce that.
180 	 */
181 	ret = snd_pcm_hw_constraint_step(runtime, 0,
182 		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
183 	if (ret)
184 		goto out;
185 
186 	ret = snd_pcm_hw_constraint_step(runtime, 0,
187 		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
188 	if (ret)
189 		goto out;
190 
191 	ret = snd_pcm_hw_constraint_integer(runtime,
192 					    SNDRV_PCM_HW_PARAM_PERIODS);
193 	if (ret < 0)
194 		goto out;
195 
196 	ret = -ENOMEM;
197 	rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
198 	if (!rtd)
199 		goto out;
200 	rtd->dma_desc_array =
201 		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
202 				       &rtd->dma_desc_array_phys, GFP_KERNEL);
203 	if (!rtd->dma_desc_array)
204 		goto err1;
205 
206 	runtime->private_data = rtd;
207 	return 0;
208 
209  err1:
210 	kfree(rtd);
211  out:
212 	return ret;
213 }
214 EXPORT_SYMBOL(__pxa2xx_pcm_open);
215 
216 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
217 {
218 	struct snd_pcm_runtime *runtime = substream->runtime;
219 	struct pxa2xx_runtime_data *rtd = runtime->private_data;
220 
221 	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
222 			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
223 	kfree(rtd);
224 	return 0;
225 }
226 EXPORT_SYMBOL(__pxa2xx_pcm_close);
227 
228 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
229 	struct vm_area_struct *vma)
230 {
231 	struct snd_pcm_runtime *runtime = substream->runtime;
232 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
233 				     runtime->dma_area,
234 				     runtime->dma_addr,
235 				     runtime->dma_bytes);
236 }
237 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
238 
239 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
240 {
241 	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
242 	struct snd_dma_buffer *buf = &substream->dma_buffer;
243 	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
244 	buf->dev.type = SNDRV_DMA_TYPE_DEV;
245 	buf->dev.dev = pcm->card->dev;
246 	buf->private_data = NULL;
247 	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
248 					   &buf->addr, GFP_KERNEL);
249 	if (!buf->area)
250 		return -ENOMEM;
251 	buf->bytes = size;
252 	return 0;
253 }
254 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
255 
256 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
257 {
258 	struct snd_pcm_substream *substream;
259 	struct snd_dma_buffer *buf;
260 	int stream;
261 
262 	for (stream = 0; stream < 2; stream++) {
263 		substream = pcm->streams[stream].substream;
264 		if (!substream)
265 			continue;
266 		buf = &substream->dma_buffer;
267 		if (!buf->area)
268 			continue;
269 		dma_free_writecombine(pcm->card->dev, buf->bytes,
270 				      buf->area, buf->addr);
271 		buf->area = NULL;
272 	}
273 }
274 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
275 
276 MODULE_AUTHOR("Nicolas Pitre");
277 MODULE_DESCRIPTION("Intel PXA2xx sound library");
278 MODULE_LICENSE("GPL");
279