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29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/platform_device.h>
32#include <linux/dma-mapping.h>
33#include <linux/gfp.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-sport.h"
44
45static void bf5xx_dma_irq(void *data)
46{
47 struct snd_pcm_substream *pcm = data;
48 snd_pcm_period_elapsed(pcm);
49}
50
51static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
52 .info = SNDRV_PCM_INFO_INTERLEAVED |
53 SNDRV_PCM_INFO_MMAP |
54 SNDRV_PCM_INFO_MMAP_VALID |
55 SNDRV_PCM_INFO_BLOCK_TRANSFER,
56 .formats = SNDRV_PCM_FMTBIT_S16_LE |
57 SNDRV_PCM_FMTBIT_S24_LE |
58 SNDRV_PCM_FMTBIT_S32_LE,
59 .period_bytes_min = 32,
60 .period_bytes_max = 0x10000,
61 .periods_min = 1,
62 .periods_max = PAGE_SIZE/32,
63 .buffer_bytes_max = 0x20000,
64 .fifo_size = 16,
65};
66
67static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params *params)
69{
70 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
71 snd_pcm_lib_malloc_pages(substream, size);
72
73 return 0;
74}
75
76static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
77{
78 snd_pcm_lib_free_pages(substream);
79
80 return 0;
81}
82
83static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
84{
85 struct snd_pcm_runtime *runtime = substream->runtime;
86 struct sport_device *sport = runtime->private_data;
87 int period_bytes = frames_to_bytes(runtime, runtime->period_size);
88
89 pr_debug("%s enter\n", __func__);
90 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
91 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
92 sport_config_tx_dma(sport, runtime->dma_area,
93 runtime->periods, period_bytes);
94 } else {
95 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
96 sport_config_rx_dma(sport, runtime->dma_area,
97 runtime->periods, period_bytes);
98 }
99
100 return 0;
101}
102
103static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
104{
105 struct snd_pcm_runtime *runtime = substream->runtime;
106 struct sport_device *sport = runtime->private_data;
107 int ret = 0;
108
109 pr_debug("%s enter\n", __func__);
110 switch (cmd) {
111 case SNDRV_PCM_TRIGGER_START:
112 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
113 sport_tx_start(sport);
114 else
115 sport_rx_start(sport);
116 break;
117 case SNDRV_PCM_TRIGGER_STOP:
118 case SNDRV_PCM_TRIGGER_SUSPEND:
119 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
120 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
121 sport_tx_stop(sport);
122 else
123 sport_rx_stop(sport);
124 break;
125 default:
126 ret = -EINVAL;
127 }
128
129 return ret;
130}
131
132static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
133{
134 struct snd_pcm_runtime *runtime = substream->runtime;
135 struct sport_device *sport = runtime->private_data;
136 unsigned int diff;
137 snd_pcm_uframes_t frames;
138 pr_debug("%s enter\n", __func__);
139 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
140 diff = sport_curr_offset_tx(sport);
141 } else {
142 diff = sport_curr_offset_rx(sport);
143 }
144
145
146
147
148
149
150 if (diff == snd_pcm_lib_buffer_bytes(substream))
151 diff = 0;
152
153 frames = bytes_to_frames(substream->runtime, diff);
154
155 return frames;
156}
157
158static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
159{
160 struct snd_soc_pcm_runtime *rtd = substream->private_data;
161 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
162 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
163 struct snd_pcm_runtime *runtime = substream->runtime;
164 struct snd_dma_buffer *buf = &substream->dma_buffer;
165 int ret;
166
167 pr_debug("%s enter\n", __func__);
168
169 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
170
171 ret = snd_pcm_hw_constraint_integer(runtime,
172 SNDRV_PCM_HW_PARAM_PERIODS);
173 if (ret < 0)
174 goto out;
175
176 if (sport_handle != NULL) {
177 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
178 sport_handle->tx_buf = buf->area;
179 else
180 sport_handle->rx_buf = buf->area;
181
182 runtime->private_data = sport_handle;
183 } else {
184 pr_err("sport_handle is NULL\n");
185 return -1;
186 }
187 return 0;
188
189 out:
190 return ret;
191}
192
193static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
194 struct vm_area_struct *vma)
195{
196 struct snd_pcm_runtime *runtime = substream->runtime;
197 size_t size = vma->vm_end - vma->vm_start;
198 vma->vm_start = (unsigned long)runtime->dma_area;
199 vma->vm_end = vma->vm_start + size;
200 vma->vm_flags |= VM_SHARED;
201
202 return 0 ;
203}
204
205static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
206 .open = bf5xx_pcm_open,
207 .ioctl = snd_pcm_lib_ioctl,
208 .hw_params = bf5xx_pcm_hw_params,
209 .hw_free = bf5xx_pcm_hw_free,
210 .prepare = bf5xx_pcm_prepare,
211 .trigger = bf5xx_pcm_trigger,
212 .pointer = bf5xx_pcm_pointer,
213 .mmap = bf5xx_pcm_mmap,
214};
215
216static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
217{
218 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
219 struct snd_dma_buffer *buf = &substream->dma_buffer;
220 size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
221
222 buf->dev.type = SNDRV_DMA_TYPE_DEV;
223 buf->dev.dev = pcm->card->dev;
224 buf->private_data = NULL;
225 buf->area = dma_alloc_coherent(pcm->card->dev, size,
226 &buf->addr, GFP_KERNEL);
227 if (!buf->area) {
228 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
229 return -ENOMEM;
230 }
231 buf->bytes = size;
232
233 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
234 buf->area, buf->bytes);
235
236 return 0;
237}
238
239static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
240{
241 struct snd_pcm_substream *substream;
242 struct snd_dma_buffer *buf;
243 int stream;
244
245 for (stream = 0; stream < 2; stream++) {
246 substream = pcm->streams[stream].substream;
247 if (!substream)
248 continue;
249
250 buf = &substream->dma_buffer;
251 if (!buf->area)
252 continue;
253 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
254 buf->area = NULL;
255 }
256}
257
258static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
259
260static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
261{
262 struct snd_card *card = rtd->card->snd_card;
263 struct snd_pcm *pcm = rtd->pcm;
264 int ret = 0;
265
266 pr_debug("%s enter\n", __func__);
267 if (!card->dev->dma_mask)
268 card->dev->dma_mask = &bf5xx_pcm_dmamask;
269 if (!card->dev->coherent_dma_mask)
270 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
271
272 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
273 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
274 SNDRV_PCM_STREAM_PLAYBACK);
275 if (ret)
276 goto out;
277 }
278
279 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
280 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
281 SNDRV_PCM_STREAM_CAPTURE);
282 if (ret)
283 goto out;
284 }
285 out:
286 return ret;
287}
288
289static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
290 .ops = &bf5xx_pcm_i2s_ops,
291 .pcm_new = bf5xx_pcm_i2s_new,
292 .pcm_free = bf5xx_pcm_free_dma_buffers,
293};
294
295static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev)
296{
297 return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
298}
299
300static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev)
301{
302 snd_soc_unregister_platform(&pdev->dev);
303 return 0;
304}
305
306static struct platform_driver bfin_i2s_pcm_driver = {
307 .driver = {
308 .name = "bfin-i2s-pcm-audio",
309 .owner = THIS_MODULE,
310 },
311
312 .probe = bfin_i2s_soc_platform_probe,
313 .remove = __devexit_p(bfin_i2s_soc_platform_remove),
314};
315
316module_platform_driver(bfin_i2s_pcm_driver);
317
318MODULE_AUTHOR("Cliff Cai");
319MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
320MODULE_LICENSE("GPL");
321
