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#include <linux/dmaengine.h>
11
12#include <sound/core.h>
13#include <sound/pcm.h>
14#include <sound/pcm_params.h>
15#include <sound/pxa2xx-lib.h>
16#include <sound/dmaengine_pcm.h>
17
18#include <mach/dma.h>
19
20#include "pxa2xx-pcm.h"
21
22static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
23	.info			= SNDRV_PCM_INFO_MMAP |
24				  SNDRV_PCM_INFO_MMAP_VALID |
25				  SNDRV_PCM_INFO_INTERLEAVED |
26				  SNDRV_PCM_INFO_PAUSE |
27				  SNDRV_PCM_INFO_RESUME,
28	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
29					SNDRV_PCM_FMTBIT_S24_LE |
30					SNDRV_PCM_FMTBIT_S32_LE,
31	.period_bytes_min	= 32,
32	.period_bytes_max	= 8192 - 32,
33	.periods_min		= 1,
34	.periods_max		= PAGE_SIZE/sizeof(pxa_dma_desc),
35	.buffer_bytes_max	= 128 * 1024,
36	.fifo_size		= 32,
37};
38
39int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
40				struct snd_pcm_hw_params *params)
41{
42	struct snd_pcm_runtime *runtime = substream->runtime;
43	struct pxa2xx_runtime_data *rtd = runtime->private_data;
44	size_t totsize = params_buffer_bytes(params);
45	size_t period = params_period_bytes(params);
46	pxa_dma_desc *dma_desc;
47	dma_addr_t dma_buff_phys, next_desc_phys;
48	u32 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
49
50	/* temporary transition hack */
51	switch (rtd->params->addr_width) {
52	case DMA_SLAVE_BUSWIDTH_1_BYTE:
53		dcmd |= DCMD_WIDTH1;
54		break;
55	case DMA_SLAVE_BUSWIDTH_2_BYTES:
56		dcmd |= DCMD_WIDTH2;
57		break;
58	case DMA_SLAVE_BUSWIDTH_4_BYTES:
59		dcmd |= DCMD_WIDTH4;
60		break;
61	default:
62		/* can't happen */
63		break;
64	}
65
66	switch (rtd->params->maxburst) {
67	case 8:
68		dcmd |= DCMD_BURST8;
69		break;
70	case 16:
71		dcmd |= DCMD_BURST16;
72		break;
73	case 32:
74		dcmd |= DCMD_BURST32;
75		break;
76	}
77
78	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
79	runtime->dma_bytes = totsize;
80
81	dma_desc = rtd->dma_desc_array;
82	next_desc_phys = rtd->dma_desc_array_phys;
83	dma_buff_phys = runtime->dma_addr;
84	do {
85		next_desc_phys += sizeof(pxa_dma_desc);
86		dma_desc->ddadr = next_desc_phys;
87		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
88			dma_desc->dsadr = dma_buff_phys;
89			dma_desc->dtadr = rtd->params->addr;
90		} else {
91			dma_desc->dsadr = rtd->params->addr;
92			dma_desc->dtadr = dma_buff_phys;
93		}
94		if (period > totsize)
95			period = totsize;
96		dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN;
97		dma_desc++;
98		dma_buff_phys += period;
99	} while (totsize -= period);
100	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
101
102	return 0;
103}
104EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
105
106int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
107{
108	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
109
110	if (rtd && rtd->params && rtd->params->filter_data) {
111		unsigned long req = *(unsigned long *) rtd->params->filter_data;
112		DRCMR(req) = 0;
113	}
114
115	snd_pcm_set_runtime_buffer(substream, NULL);
116	return 0;
117}
118EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
119
120int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
121{
122	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
123	int ret = 0;
124
125	switch (cmd) {
126	case SNDRV_PCM_TRIGGER_START:
127		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
128		DCSR(prtd->dma_ch) = DCSR_RUN;
129		break;
130
131	case SNDRV_PCM_TRIGGER_STOP:
132	case SNDRV_PCM_TRIGGER_SUSPEND:
133	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
134		DCSR(prtd->dma_ch) &= ~DCSR_RUN;
135		break;
136
137	case SNDRV_PCM_TRIGGER_RESUME:
138		DCSR(prtd->dma_ch) |= DCSR_RUN;
139		break;
140	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
141		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
142		DCSR(prtd->dma_ch) |= DCSR_RUN;
143		break;
144
145	default:
146		ret = -EINVAL;
147	}
148
149	return ret;
150}
151EXPORT_SYMBOL(pxa2xx_pcm_trigger);
152
153snd_pcm_uframes_t
154pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
155{
156	struct snd_pcm_runtime *runtime = substream->runtime;
157	struct pxa2xx_runtime_data *prtd = runtime->private_data;
158
159	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
160			 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
161	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
162
163	if (x == runtime->buffer_size)
164		x = 0;
165	return x;
166}
167EXPORT_SYMBOL(pxa2xx_pcm_pointer);
168
169int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
170{
171	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
172	unsigned long req;
173
174	if (!prtd || !prtd->params)
175		return 0;
176
177	if (prtd->dma_ch == -1)
178		return -EINVAL;
179
180	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
181	DCSR(prtd->dma_ch) = 0;
182	DCMD(prtd->dma_ch) = 0;
183	req = *(unsigned long *) prtd->params->filter_data;
184	DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD;
185
186	return 0;
187}
188EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
189
190void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
191{
192	struct snd_pcm_substream *substream = dev_id;
193	int dcsr;
194
195	dcsr = DCSR(dma_ch);
196	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
197
198	if (dcsr & DCSR_ENDINTR) {
199		snd_pcm_period_elapsed(substream);
200	} else {
201		printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n",
202			dma_ch, dcsr);
203		snd_pcm_stop_xrun(substream);
204	}
205}
206EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
207
208int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
209{
210	struct snd_pcm_runtime *runtime = substream->runtime;
211	struct pxa2xx_runtime_data *rtd;
212	int ret;
213
214	runtime->hw = pxa2xx_pcm_hardware;
215
216	/*
217	 * For mysterious reasons (and despite what the manual says)
218	 * playback samples are lost if the DMA count is not a multiple
219	 * of the DMA burst size.  Let's add a rule to enforce that.
220	 */
221	ret = snd_pcm_hw_constraint_step(runtime, 0,
222		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
223	if (ret)
224		goto out;
225
226	ret = snd_pcm_hw_constraint_step(runtime, 0,
227		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
228	if (ret)
229		goto out;
230
231	ret = snd_pcm_hw_constraint_integer(runtime,
232					    SNDRV_PCM_HW_PARAM_PERIODS);
233	if (ret < 0)
234		goto out;
235
236	ret = -ENOMEM;
237	rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
238	if (!rtd)
239		goto out;
240	rtd->dma_desc_array =
241		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
242				       &rtd->dma_desc_array_phys, GFP_KERNEL);
243	if (!rtd->dma_desc_array)
244		goto err1;
245
246	rtd->dma_ch = -1;
247	runtime->private_data = rtd;
248	return 0;
249
250 err1:
251	kfree(rtd);
252 out:
253	return ret;
254}
255EXPORT_SYMBOL(__pxa2xx_pcm_open);
256
257int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
258{
259	struct snd_pcm_runtime *runtime = substream->runtime;
260	struct pxa2xx_runtime_data *rtd = runtime->private_data;
261
262	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
263			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
264	kfree(rtd);
265	return 0;
266}
267EXPORT_SYMBOL(__pxa2xx_pcm_close);
268
269int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
270	struct vm_area_struct *vma)
271{
272	struct snd_pcm_runtime *runtime = substream->runtime;
273	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
274				     runtime->dma_area,
275				     runtime->dma_addr,
276				     runtime->dma_bytes);
277}
278EXPORT_SYMBOL(pxa2xx_pcm_mmap);
279
280int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
281{
282	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
283	struct snd_dma_buffer *buf = &substream->dma_buffer;
284	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
285	buf->dev.type = SNDRV_DMA_TYPE_DEV;
286	buf->dev.dev = pcm->card->dev;
287	buf->private_data = NULL;
288	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
289					   &buf->addr, GFP_KERNEL);
290	if (!buf->area)
291		return -ENOMEM;
292	buf->bytes = size;
293	return 0;
294}
295EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
296
297void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
298{
299	struct snd_pcm_substream *substream;
300	struct snd_dma_buffer *buf;
301	int stream;
302
303	for (stream = 0; stream < 2; stream++) {
304		substream = pcm->streams[stream].substream;
305		if (!substream)
306			continue;
307		buf = &substream->dma_buffer;
308		if (!buf->area)
309			continue;
310		dma_free_writecombine(pcm->card->dev, buf->bytes,
311				      buf->area, buf->addr);
312		buf->area = NULL;
313	}
314}
315EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
316
317MODULE_AUTHOR("Nicolas Pitre");
318MODULE_DESCRIPTION("Intel PXA2xx sound library");
319MODULE_LICENSE("GPL");
320