[ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach
[linux-2.6.git] / sound / arm / pxa2xx-pcm.c
1 /*
2  * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
3  *
4  * Author:      Nicolas Pitre
5  * Created:     Nov 30, 2004
6  * Copyright:   (C) 2004 MontaVista Software, Inc.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/device.h>
16 #include <linux/slab.h>
17 #include <linux/dma-mapping.h>
18
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22
23 #include <asm/dma.h>
24 #include <mach/hardware.h>
25 #include <mach/pxa-regs.h>
26
27 #include "pxa2xx-pcm.h"
28
29
30 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
31         .info                   = SNDRV_PCM_INFO_MMAP |
32                                   SNDRV_PCM_INFO_MMAP_VALID |
33                                   SNDRV_PCM_INFO_INTERLEAVED |
34                                   SNDRV_PCM_INFO_PAUSE,
35         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
36         .period_bytes_min       = 32,
37         .period_bytes_max       = 8192 - 32,
38         .periods_min            = 1,
39         .periods_max            = PAGE_SIZE/sizeof(pxa_dma_desc),
40         .buffer_bytes_max       = 128 * 1024,
41         .fifo_size              = 32,
42 };
43
44 struct pxa2xx_runtime_data {
45         int dma_ch;
46         struct pxa2xx_pcm_dma_params *params;
47         pxa_dma_desc *dma_desc_array;
48         dma_addr_t dma_desc_array_phys;
49 };
50
51 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
52                                 struct snd_pcm_hw_params *params)
53 {
54         struct snd_pcm_runtime *runtime = substream->runtime;
55         struct pxa2xx_runtime_data *rtd = runtime->private_data;
56         size_t totsize = params_buffer_bytes(params);
57         size_t period = params_period_bytes(params);
58         pxa_dma_desc *dma_desc;
59         dma_addr_t dma_buff_phys, next_desc_phys;
60
61         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
62         runtime->dma_bytes = totsize;
63
64         dma_desc = rtd->dma_desc_array;
65         next_desc_phys = rtd->dma_desc_array_phys;
66         dma_buff_phys = runtime->dma_addr;
67         do {
68                 next_desc_phys += sizeof(pxa_dma_desc);
69                 dma_desc->ddadr = next_desc_phys;
70                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
71                         dma_desc->dsadr = dma_buff_phys;
72                         dma_desc->dtadr = rtd->params->dev_addr;
73                 } else {
74                         dma_desc->dsadr = rtd->params->dev_addr;
75                         dma_desc->dtadr = dma_buff_phys;
76                 }
77                 if (period > totsize)
78                         period = totsize;
79                 dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
80                 dma_desc++;
81                 dma_buff_phys += period;
82         } while (totsize -= period);
83         dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
84
85         return 0;
86 }
87
88 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
89 {
90         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
91
92         *rtd->params->drcmr = 0;
93         snd_pcm_set_runtime_buffer(substream, NULL);
94         return 0;
95 }
96
97 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
98 {
99         struct pxa2xx_pcm_client *client = substream->private_data;
100         struct snd_pcm_runtime *runtime = substream->runtime;
101         struct pxa2xx_runtime_data *rtd = runtime->private_data;
102
103         DCSR(rtd->dma_ch) &= ~DCSR_RUN;
104         DCSR(rtd->dma_ch) = 0;
105         DCMD(rtd->dma_ch) = 0;
106         *rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;
107
108         return client->prepare(substream);
109 }
110
111 static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
112 {
113         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
114         int ret = 0;
115
116         switch (cmd) {
117         case SNDRV_PCM_TRIGGER_START:
118                 DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
119                 DCSR(rtd->dma_ch) = DCSR_RUN;
120                 break;
121
122         case SNDRV_PCM_TRIGGER_STOP:
123         case SNDRV_PCM_TRIGGER_SUSPEND:
124         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
125                 DCSR(rtd->dma_ch) &= ~DCSR_RUN;
126                 break;
127
128         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
129                 DCSR(rtd->dma_ch) |= DCSR_RUN;
130                 break;
131
132         default:
133                 ret = -EINVAL;
134         }
135
136         return ret;
137 }
138
139 static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
140 {
141         struct snd_pcm_substream *substream = dev_id;
142         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
143         int dcsr;
144
145         dcsr = DCSR(dma_ch);
146         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
147
148         if (dcsr & DCSR_ENDINTR) {
149                 snd_pcm_period_elapsed(substream);
150         } else {
151                 printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
152                         rtd->params->name, dma_ch, dcsr );
153                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
154         }
155 }
156
157 static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
158 {
159         struct snd_pcm_runtime *runtime = substream->runtime;
160         struct pxa2xx_runtime_data *rtd = runtime->private_data;
161         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
162                          DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
163         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
164         if (x == runtime->buffer_size)
165                 x = 0;
166         return x;
167 }
168
169 static int
170 pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
171 {
172         struct snd_interval *i = hw_param_interval(params, rule->var);
173         int changed = 0;
174
175         if (i->min & 31) {
176                 i->min = (i->min & ~31) + 32;
177                 i->openmin = 0;
178                 changed = 1;
179         }
180
181         if (i->max & 31) {
182                 i->max &= ~31;
183                 i->openmax = 0;
184                 changed = 1;
185         }
186
187         return changed;
188 }
189
190 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
191 {
192         struct pxa2xx_pcm_client *client = substream->private_data;
193         struct snd_pcm_runtime *runtime = substream->runtime;
194         struct pxa2xx_runtime_data *rtd;
195         int ret;
196
197         runtime->hw = pxa2xx_pcm_hardware;
198
199         /*
200          * For mysterious reasons (and despite what the manual says)
201          * playback samples are lost if the DMA count is not a multiple
202          * of the DMA burst size.  Let's add a rule to enforce that.
203          */
204         ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
205                                   pxa2xx_pcm_hw_rule_mult32, NULL,
206                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
207         if (ret)
208                 goto out;
209         ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
210                                   pxa2xx_pcm_hw_rule_mult32, NULL,
211                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
212         if (ret)
213                 goto out;
214
215         ret = -ENOMEM;
216         rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
217         if (!rtd)
218                 goto out;
219         rtd->dma_desc_array =
220                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
221                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
222         if (!rtd->dma_desc_array)
223                 goto err1;
224
225         rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
226                       client->playback_params : client->capture_params;
227         ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
228                               pxa2xx_pcm_dma_irq, substream);
229         if (ret < 0)
230                 goto err2;
231         rtd->dma_ch = ret;
232
233         runtime->private_data = rtd;
234         ret = client->startup(substream);
235         if (!ret)
236                 goto out;
237
238         pxa_free_dma(rtd->dma_ch);
239  err2:
240         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
241                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
242  err1:
243         kfree(rtd);
244  out:
245         return ret;
246 }
247
248 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
249 {
250         struct pxa2xx_pcm_client *client = substream->private_data;
251         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
252
253         pxa_free_dma(rtd->dma_ch);
254         client->shutdown(substream);
255         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
256                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
257         kfree(rtd);
258         return 0;
259 }
260
261 static int
262 pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma)
263 {
264         struct snd_pcm_runtime *runtime = substream->runtime;
265         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
266                                      runtime->dma_area,
267                                      runtime->dma_addr,
268                                      runtime->dma_bytes);
269 }
270
271 static struct snd_pcm_ops pxa2xx_pcm_ops = {
272         .open           = pxa2xx_pcm_open,
273         .close          = pxa2xx_pcm_close,
274         .ioctl          = snd_pcm_lib_ioctl,
275         .hw_params      = pxa2xx_pcm_hw_params,
276         .hw_free        = pxa2xx_pcm_hw_free,
277         .prepare        = pxa2xx_pcm_prepare,
278         .trigger        = pxa2xx_pcm_trigger,
279         .pointer        = pxa2xx_pcm_pointer,
280         .mmap           = pxa2xx_pcm_mmap,
281 };
282
283 static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
284 {
285         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
286         struct snd_dma_buffer *buf = &substream->dma_buffer;
287         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
288         buf->dev.type = SNDRV_DMA_TYPE_DEV;
289         buf->dev.dev = pcm->card->dev;
290         buf->private_data = NULL;
291         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
292                                            &buf->addr, GFP_KERNEL);
293         if (!buf->area)
294                 return -ENOMEM;
295         buf->bytes = size;
296         return 0;
297 }
298
299 static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
300 {
301         struct snd_pcm_substream *substream;
302         struct snd_dma_buffer *buf;
303         int stream;
304
305         for (stream = 0; stream < 2; stream++) {
306                 substream = pcm->streams[stream].substream;
307                 if (!substream)
308                         continue;
309                 buf = &substream->dma_buffer;
310                 if (!buf->area)
311                         continue;
312                 dma_free_writecombine(pcm->card->dev, buf->bytes,
313                                       buf->area, buf->addr);
314                 buf->area = NULL;
315         }
316 }
317
318 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
319
320 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
321                    struct snd_pcm **rpcm)
322 {
323         struct snd_pcm *pcm;
324         int play = client->playback_params ? 1 : 0;
325         int capt = client->capture_params ? 1 : 0;
326         int ret;
327
328         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
329         if (ret)
330                 goto out;
331
332         pcm->private_data = client;
333         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
334
335         if (!card->dev->dma_mask)
336                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
337         if (!card->dev->coherent_dma_mask)
338                 card->dev->coherent_dma_mask = 0xffffffff;
339
340         if (play) {
341                 int stream = SNDRV_PCM_STREAM_PLAYBACK;
342                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
343                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
344                 if (ret)
345                         goto out;
346         }
347         if (capt) {
348                 int stream = SNDRV_PCM_STREAM_CAPTURE;
349                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
350                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
351                 if (ret)
352                         goto out;
353         }
354
355         if (rpcm)
356                 *rpcm = pcm;
357         ret = 0;
358
359  out:
360         return ret;
361 }
362
363 EXPORT_SYMBOL(pxa2xx_pcm_new);
364
365 MODULE_AUTHOR("Nicolas Pitre");
366 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
367 MODULE_LICENSE("GPL");