ASoC: Staticise PCM operations tables
[linux-2.6.git] / sound / soc / blackfin / bf5xx-i2s-pcm.c
1 /*
2  * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
3  * Author:       Cliff Cai <Cliff.Cai@analog.com>
4  *
5  * Created:      Tue June 06 2008
6  * Description:  DMA driver for i2s codec
7  *
8  * Modified:
9  *               Copyright 2008 Analog Devices Inc.
10  *
11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, see the file COPYING, or write
25  * to the Free Software Foundation, Inc.,
26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
27  */
28
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/platform_device.h>
32 #include <linux/slab.h>
33 #include <linux/dma-mapping.h>
34
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39
40 #include <asm/dma.h>
41
42 #include "bf5xx-i2s-pcm.h"
43 #include "bf5xx-i2s.h"
44 #include "bf5xx-sport.h"
45
46 static void bf5xx_dma_irq(void *data)
47 {
48         struct snd_pcm_substream *pcm = data;
49         snd_pcm_period_elapsed(pcm);
50 }
51
52 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
53         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
54                                    SNDRV_PCM_INFO_MMAP |
55                                    SNDRV_PCM_INFO_MMAP_VALID |
56                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
57         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
58                                    SNDRV_PCM_FMTBIT_S24_LE |
59                                    SNDRV_PCM_FMTBIT_S32_LE,
60         .period_bytes_min       = 32,
61         .period_bytes_max       = 0x10000,
62         .periods_min            = 1,
63         .periods_max            = PAGE_SIZE/32,
64         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
65         .fifo_size              = 16,
66 };
67
68 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
69         struct snd_pcm_hw_params *params)
70 {
71         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
72         snd_pcm_lib_malloc_pages(substream, size);
73
74         return 0;
75 }
76
77 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
78 {
79         snd_pcm_lib_free_pages(substream);
80
81         return 0;
82 }
83
84 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
85 {
86         struct snd_pcm_runtime *runtime = substream->runtime;
87         struct sport_device *sport = runtime->private_data;
88         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
89
90         pr_debug("%s enter\n", __func__);
91         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
92                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
93                 sport_config_tx_dma(sport, runtime->dma_area,
94                         runtime->periods, period_bytes);
95         } else {
96                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
97                 sport_config_rx_dma(sport, runtime->dma_area,
98                         runtime->periods, period_bytes);
99         }
100
101         return 0;
102 }
103
104 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
105 {
106         struct snd_pcm_runtime *runtime = substream->runtime;
107         struct sport_device *sport = runtime->private_data;
108         int ret = 0;
109
110         pr_debug("%s enter\n", __func__);
111         switch (cmd) {
112         case SNDRV_PCM_TRIGGER_START:
113                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
114                         sport_tx_start(sport);
115                 else
116                         sport_rx_start(sport);
117                 break;
118         case SNDRV_PCM_TRIGGER_STOP:
119         case SNDRV_PCM_TRIGGER_SUSPEND:
120         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
121                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
122                         sport_tx_stop(sport);
123                 else
124                         sport_rx_stop(sport);
125                 break;
126         default:
127                 ret = -EINVAL;
128         }
129
130         return ret;
131 }
132
133 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
134 {
135         struct snd_pcm_runtime *runtime = substream->runtime;
136         struct sport_device *sport = runtime->private_data;
137         unsigned int diff;
138         snd_pcm_uframes_t frames;
139         pr_debug("%s enter\n", __func__);
140         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
141                 diff = sport_curr_offset_tx(sport);
142                 frames = bytes_to_frames(substream->runtime, diff);
143         } else {
144                 diff = sport_curr_offset_rx(sport);
145                 frames = bytes_to_frames(substream->runtime, diff);
146         }
147         return frames;
148 }
149
150 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
151 {
152         struct snd_pcm_runtime *runtime = substream->runtime;
153         int ret;
154
155         pr_debug("%s enter\n", __func__);
156         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
157
158         ret = snd_pcm_hw_constraint_integer(runtime, \
159                         SNDRV_PCM_HW_PARAM_PERIODS);
160         if (ret < 0)
161                 goto out;
162
163         if (sport_handle != NULL)
164                 runtime->private_data = sport_handle;
165         else {
166                 pr_err("sport_handle is NULL\n");
167                 return -1;
168         }
169         return 0;
170
171  out:
172         return ret;
173 }
174
175 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
176         struct vm_area_struct *vma)
177 {
178         struct snd_pcm_runtime *runtime = substream->runtime;
179         size_t size = vma->vm_end - vma->vm_start;
180         vma->vm_start = (unsigned long)runtime->dma_area;
181         vma->vm_end = vma->vm_start + size;
182         vma->vm_flags |=  VM_SHARED;
183
184         return 0 ;
185 }
186
187 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
188         .open           = bf5xx_pcm_open,
189         .ioctl          = snd_pcm_lib_ioctl,
190         .hw_params      = bf5xx_pcm_hw_params,
191         .hw_free        = bf5xx_pcm_hw_free,
192         .prepare        = bf5xx_pcm_prepare,
193         .trigger        = bf5xx_pcm_trigger,
194         .pointer        = bf5xx_pcm_pointer,
195         .mmap           = bf5xx_pcm_mmap,
196 };
197
198 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
199 {
200         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
201         struct snd_dma_buffer *buf = &substream->dma_buffer;
202         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
203
204         buf->dev.type = SNDRV_DMA_TYPE_DEV;
205         buf->dev.dev = pcm->card->dev;
206         buf->private_data = NULL;
207         buf->area = dma_alloc_coherent(pcm->card->dev, size,
208                         &buf->addr, GFP_KERNEL);
209         if (!buf->area) {
210                 pr_err("Failed to allocate dma memory \
211                         Please increase uncached DMA memory region\n");
212                 return -ENOMEM;
213         }
214         buf->bytes = size;
215
216         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
217                 buf->area, buf->bytes);
218
219         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
220                 sport_handle->tx_buf = buf->area;
221         else
222                 sport_handle->rx_buf = buf->area;
223
224         return 0;
225 }
226
227 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
228 {
229         struct snd_pcm_substream *substream;
230         struct snd_dma_buffer *buf;
231         int stream;
232
233         for (stream = 0; stream < 2; stream++) {
234                 substream = pcm->streams[stream].substream;
235                 if (!substream)
236                         continue;
237
238                 buf = &substream->dma_buffer;
239                 if (!buf->area)
240                         continue;
241                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
242                 buf->area = NULL;
243         }
244         if (sport_handle)
245                 sport_done(sport_handle);
246 }
247
248 static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
249
250 int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
251         struct snd_pcm *pcm)
252 {
253         int ret = 0;
254
255         pr_debug("%s enter\n", __func__);
256         if (!card->dev->dma_mask)
257                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
258         if (!card->dev->coherent_dma_mask)
259                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
260
261         if (dai->playback.channels_min) {
262                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
263                         SNDRV_PCM_STREAM_PLAYBACK);
264                 if (ret)
265                         goto out;
266         }
267
268         if (dai->capture.channels_min) {
269                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
270                         SNDRV_PCM_STREAM_CAPTURE);
271                 if (ret)
272                         goto out;
273         }
274  out:
275         return ret;
276 }
277
278 struct snd_soc_platform bf5xx_i2s_soc_platform = {
279         .name           = "bf5xx-audio",
280         .pcm_ops        = &bf5xx_pcm_i2s_ops,
281         .pcm_new        = bf5xx_pcm_i2s_new,
282         .pcm_free       = bf5xx_pcm_free_dma_buffers,
283 };
284 EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
285
286 static int __init bfin_i2s_init(void)
287 {
288         return snd_soc_register_platform(&bf5xx_i2s_soc_platform);
289 }
290 module_init(bfin_i2s_init);
291
292 static void __exit bfin_i2s_exit(void)
293 {
294         snd_soc_unregister_platform(&bf5xx_i2s_soc_platform);
295 }
296 module_exit(bfin_i2s_exit);
297
298 MODULE_AUTHOR("Cliff Cai");
299 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
300 MODULE_LICENSE("GPL");