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
bf5xx_dma_irq(void * data)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
bf5xx_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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
bf5xx_pcm_hw_free(struct snd_pcm_substream * substream)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
bf5xx_pcm_prepare(struct snd_pcm_substream * substream)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
bf5xx_pcm_trigger(struct snd_pcm_substream * substream,int cmd)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
bf5xx_pcm_pointer(struct snd_pcm_substream * substream)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
bf5xx_pcm_open(struct snd_pcm_substream * substream)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
bf5xx_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)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 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
bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)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
bf5xx_pcm_free_dma_buffers(struct snd_pcm * pcm)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
bf5xx_pcm_i2s_new(struct snd_card * card,struct snd_soc_dai * dai,struct snd_pcm * pcm)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
bfin_i2s_init(void)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
bfin_i2s_exit(void)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");
301