IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-3.10.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/driver.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23
24 #include <asm/dma.h>
25 #include <asm/hardware.h>
26 #include <asm/arch/pxa-regs.h>
27
28 #include "pxa2xx-pcm.h"
29
30
31 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
32         .info                   = SNDRV_PCM_INFO_MMAP |
33                                   SNDRV_PCM_INFO_MMAP_VALID |
34                                   SNDRV_PCM_INFO_INTERLEAVED |
35                                   SNDRV_PCM_INFO_PAUSE,
36         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
37         .period_bytes_min       = 32,
38         .period_bytes_max       = 8192 - 32,
39         .periods_min            = 1,
40         .periods_max            = PAGE_SIZE/sizeof(pxa_dma_desc),
41         .buffer_bytes_max       = 128 * 1024,
42         .fifo_size              = 32,
43 };
44
45 struct pxa2xx_runtime_data {
46         int dma_ch;
47         struct pxa2xx_pcm_dma_params *params;
48         pxa_dma_desc *dma_desc_array;
49         dma_addr_t dma_desc_array_phys;
50 };
51
52 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
53                                 struct snd_pcm_hw_params *params)
54 {
55         struct snd_pcm_runtime *runtime = substream->runtime;
56         struct pxa2xx_runtime_data *rtd = runtime->private_data;
57         size_t totsize = params_buffer_bytes(params);
58         size_t period = params_period_bytes(params);
59         pxa_dma_desc *dma_desc;
60         dma_addr_t dma_buff_phys, next_desc_phys;
61
62         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
63         runtime->dma_bytes = totsize;
64
65         dma_desc = rtd->dma_desc_array;
66         next_desc_phys = rtd->dma_desc_array_phys;
67         dma_buff_phys = runtime->dma_addr;
68         do {
69                 next_desc_phys += sizeof(pxa_dma_desc);
70                 dma_desc->ddadr = next_desc_phys;
71                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
72                         dma_desc->dsadr = dma_buff_phys;
73                         dma_desc->dtadr = rtd->params->dev_addr;
74                 } else {
75                         dma_desc->dsadr = rtd->params->dev_addr;
76                         dma_desc->dtadr = dma_buff_phys;
77                 }
78                 if (period > totsize)
79                         period = totsize;
80                 dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
81                 dma_desc++;
82                 dma_buff_phys += period;
83         } while (totsize -= period);
84         dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
85
86         return 0;
87 }
88
89 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
90 {
91         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
92
93         *rtd->params->drcmr = 0;
94         snd_pcm_set_runtime_buffer(substream, NULL);
95         return 0;
96 }
97
98 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
99 {
100         struct pxa2xx_pcm_client *client = substream->private_data;
101         struct snd_pcm_runtime *runtime = substream->runtime;
102         struct pxa2xx_runtime_data *rtd = runtime->private_data;
103
104         DCSR(rtd->dma_ch) &= ~DCSR_RUN;
105         DCSR(rtd->dma_ch) = 0;
106         DCMD(rtd->dma_ch) = 0;
107         *rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;
108
109         return client->prepare(substream);
110 }
111
112 static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
113 {
114         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
115         int ret = 0;
116
117         switch (cmd) {
118         case SNDRV_PCM_TRIGGER_START:
119                 DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
120                 DCSR(rtd->dma_ch) = DCSR_RUN;
121                 break;
122
123         case SNDRV_PCM_TRIGGER_STOP:
124         case SNDRV_PCM_TRIGGER_SUSPEND:
125         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
126                 DCSR(rtd->dma_ch) &= ~DCSR_RUN;
127                 break;
128
129         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
130                 DCSR(rtd->dma_ch) |= DCSR_RUN;
131                 break;
132
133         default:
134                 ret = -EINVAL;
135         }
136
137         return ret;
138 }
139
140 static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
141 {
142         struct snd_pcm_substream *substream = dev_id;
143         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
144         int dcsr;
145
146         dcsr = DCSR(dma_ch);
147         DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
148
149         if (dcsr & DCSR_ENDINTR) {
150                 snd_pcm_period_elapsed(substream);
151         } else {
152                 printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
153                         rtd->params->name, dma_ch, dcsr );
154                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
155         }
156 }
157
158 static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
159 {
160         struct snd_pcm_runtime *runtime = substream->runtime;
161         struct pxa2xx_runtime_data *rtd = runtime->private_data;
162         dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
163                          DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
164         snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
165         if (x == runtime->buffer_size)
166                 x = 0;
167         return x;
168 }
169
170 static int
171 pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
172 {
173         struct snd_interval *i = hw_param_interval(params, rule->var);
174         int changed = 0;
175
176         if (i->min & 31) {
177                 i->min = (i->min & ~31) + 32;
178                 i->openmin = 0;
179                 changed = 1;
180         }
181
182         if (i->max & 31) {
183                 i->max &= ~31;
184                 i->openmax = 0;
185                 changed = 1;
186         }
187
188         return changed;
189 }
190
191 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
192 {
193         struct pxa2xx_pcm_client *client = substream->private_data;
194         struct snd_pcm_runtime *runtime = substream->runtime;
195         struct pxa2xx_runtime_data *rtd;
196         int ret;
197
198         runtime->hw = pxa2xx_pcm_hardware;
199
200         /*
201          * For mysterious reasons (and despite what the manual says)
202          * playback samples are lost if the DMA count is not a multiple
203          * of the DMA burst size.  Let's add a rule to enforce that.
204          */
205         ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
206                                   pxa2xx_pcm_hw_rule_mult32, NULL,
207                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
208         if (ret)
209                 goto out;
210         ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
211                                   pxa2xx_pcm_hw_rule_mult32, NULL,
212                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
213         if (ret)
214                 goto out;
215
216         ret = -ENOMEM;
217         rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
218         if (!rtd)
219                 goto out;
220         rtd->dma_desc_array =
221                 dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
222                                        &rtd->dma_desc_array_phys, GFP_KERNEL);
223         if (!rtd->dma_desc_array)
224                 goto err1;
225
226         rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
227                       client->playback_params : client->capture_params;
228         ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
229                               pxa2xx_pcm_dma_irq, substream);
230         if (ret < 0)
231                 goto err2;
232         rtd->dma_ch = ret;
233
234         runtime->private_data = rtd;
235         ret = client->startup(substream);
236         if (!ret)
237                 goto out;
238
239         pxa_free_dma(rtd->dma_ch);
240  err2:
241         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
242                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
243  err1:
244         kfree(rtd);
245  out:
246         return ret;
247 }
248
249 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
250 {
251         struct pxa2xx_pcm_client *client = substream->private_data;
252         struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
253
254         pxa_free_dma(rtd->dma_ch);
255         client->shutdown(substream);
256         dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
257                               rtd->dma_desc_array, rtd->dma_desc_array_phys);
258         kfree(rtd);
259         return 0;
260 }
261
262 static int
263 pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma)
264 {
265         struct snd_pcm_runtime *runtime = substream->runtime;
266         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
267                                      runtime->dma_area,
268                                      runtime->dma_addr,
269                                      runtime->dma_bytes);
270 }
271
272 static struct snd_pcm_ops pxa2xx_pcm_ops = {
273         .open           = pxa2xx_pcm_open,
274         .close          = pxa2xx_pcm_close,
275         .ioctl          = snd_pcm_lib_ioctl,
276         .hw_params      = pxa2xx_pcm_hw_params,
277         .hw_free        = pxa2xx_pcm_hw_free,
278         .prepare        = pxa2xx_pcm_prepare,
279         .trigger        = pxa2xx_pcm_trigger,
280         .pointer        = pxa2xx_pcm_pointer,
281         .mmap           = pxa2xx_pcm_mmap,
282 };
283
284 static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
285 {
286         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
287         struct snd_dma_buffer *buf = &substream->dma_buffer;
288         size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
289         buf->dev.type = SNDRV_DMA_TYPE_DEV;
290         buf->dev.dev = pcm->card->dev;
291         buf->private_data = NULL;
292         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
293                                            &buf->addr, GFP_KERNEL);
294         if (!buf->area)
295                 return -ENOMEM;
296         buf->bytes = size;
297         return 0;
298 }
299
300 static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
301 {
302         struct snd_pcm_substream *substream;
303         struct snd_dma_buffer *buf;
304         int stream;
305
306         for (stream = 0; stream < 2; stream++) {
307                 substream = pcm->streams[stream].substream;
308                 if (!substream)
309                         continue;
310                 buf = &substream->dma_buffer;
311                 if (!buf->area)
312                         continue;
313                 dma_free_writecombine(pcm->card->dev, buf->bytes,
314                                       buf->area, buf->addr);
315                 buf->area = NULL;
316         }
317 }
318
319 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
320
321 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
322                    struct snd_pcm **rpcm)
323 {
324         struct snd_pcm *pcm;
325         int play = client->playback_params ? 1 : 0;
326         int capt = client->capture_params ? 1 : 0;
327         int ret;
328
329         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
330         if (ret)
331                 goto out;
332
333         pcm->private_data = client;
334         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
335
336         if (!card->dev->dma_mask)
337                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
338         if (!card->dev->coherent_dma_mask)
339                 card->dev->coherent_dma_mask = 0xffffffff;
340
341         if (play) {
342                 int stream = SNDRV_PCM_STREAM_PLAYBACK;
343                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
344                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
345                 if (ret)
346                         goto out;
347         }
348         if (capt) {
349                 int stream = SNDRV_PCM_STREAM_CAPTURE;
350                 snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
351                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
352                 if (ret)
353                         goto out;
354         }
355
356         if (rpcm)
357                 *rpcm = pcm;
358         ret = 0;
359
360  out:
361         return ret;
362 }
363
364 EXPORT_SYMBOL(pxa2xx_pcm_new);
365
366 MODULE_AUTHOR("Nicolas Pitre");
367 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
368 MODULE_LICENSE("GPL");