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12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/platform_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#include <sound/soc.h>
23
24#include <mach/hardware.h>
25
26#include "nuc900-audio.h"
27
28static const struct snd_pcm_hardware nuc900_pcm_hardware = {
29 .info = SNDRV_PCM_INFO_INTERLEAVED |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER |
31 SNDRV_PCM_INFO_MMAP |
32 SNDRV_PCM_INFO_MMAP_VALID |
33 SNDRV_PCM_INFO_PAUSE |
34 SNDRV_PCM_INFO_RESUME,
35 .formats = SNDRV_PCM_FMTBIT_S16_LE,
36 .channels_min = 1,
37 .channels_max = 2,
38 .buffer_bytes_max = 4*1024,
39 .period_bytes_min = 1*1024,
40 .period_bytes_max = 4*1024,
41 .periods_min = 1,
42 .periods_max = 1024,
43};
44
45static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
46 struct snd_pcm_hw_params *params)
47{
48 struct snd_pcm_runtime *runtime = substream->runtime;
49 struct nuc900_audio *nuc900_audio = runtime->private_data;
50 unsigned long flags;
51 int ret = 0;
52
53 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
54 if (ret < 0)
55 return ret;
56
57 spin_lock_irqsave(&nuc900_audio->lock, flags);
58
59 nuc900_audio->substream = substream;
60 nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr;
61 nuc900_audio->buffersize[substream->stream] =
62 params_buffer_bytes(params);
63
64 spin_unlock_irqrestore(&nuc900_audio->lock, flags);
65
66 return ret;
67}
68
69static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
70 dma_addr_t dma_addr, size_t count)
71{
72 struct snd_pcm_runtime *runtime = substream->runtime;
73 struct nuc900_audio *nuc900_audio = runtime->private_data;
74 void __iomem *mmio_addr, *mmio_len;
75
76 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
77 mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
78 mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
79 } else {
80 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
81 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
82 }
83
84 AUDIO_WRITE(mmio_addr, dma_addr);
85 AUDIO_WRITE(mmio_len, count);
86}
87
88static void nuc900_dma_start(struct snd_pcm_substream *substream)
89{
90 struct snd_pcm_runtime *runtime = substream->runtime;
91 struct nuc900_audio *nuc900_audio = runtime->private_data;
92 unsigned long val;
93
94 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
95 val |= (T_DMA_IRQ | R_DMA_IRQ);
96 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
97}
98
99static void nuc900_dma_stop(struct snd_pcm_substream *substream)
100{
101 struct snd_pcm_runtime *runtime = substream->runtime;
102 struct nuc900_audio *nuc900_audio = runtime->private_data;
103 unsigned long val;
104
105 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
106 val &= ~(T_DMA_IRQ | R_DMA_IRQ);
107 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
108}
109
110static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
111{
112 struct snd_pcm_substream *substream = dev_id;
113 struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
114 unsigned long val;
115
116 spin_lock(&nuc900_audio->lock);
117
118 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
119
120 if (val & R_DMA_IRQ) {
121 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
122
123 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
124
125 if (val & R_DMA_MIDDLE_IRQ) {
126 val |= R_DMA_MIDDLE_IRQ;
127 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
128 }
129
130 if (val & R_DMA_END_IRQ) {
131 val |= R_DMA_END_IRQ;
132 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
133 }
134 } else if (val & T_DMA_IRQ) {
135 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
136
137 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
138
139 if (val & P_DMA_MIDDLE_IRQ) {
140 val |= P_DMA_MIDDLE_IRQ;
141 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
142 }
143
144 if (val & P_DMA_END_IRQ) {
145 val |= P_DMA_END_IRQ;
146 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
147 }
148 } else {
149 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
150 spin_unlock(&nuc900_audio->lock);
151 return IRQ_HANDLED;
152 }
153
154 spin_unlock(&nuc900_audio->lock);
155
156 snd_pcm_period_elapsed(substream);
157
158 return IRQ_HANDLED;
159}
160
161static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
162{
163 snd_pcm_lib_free_pages(substream);
164 return 0;
165}
166
167static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
168{
169 struct snd_pcm_runtime *runtime = substream->runtime;
170 struct nuc900_audio *nuc900_audio = runtime->private_data;
171 unsigned long flags, val;
172 int ret = 0;
173
174 spin_lock_irqsave(&nuc900_audio->lock, flags);
175
176 nuc900_update_dma_register(substream,
177 nuc900_audio->dma_addr[substream->stream],
178 nuc900_audio->buffersize[substream->stream]);
179
180 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
181
182 switch (runtime->channels) {
183 case 1:
184 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
185 val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
186 val |= PLAY_RIGHT_CHNNEL;
187 } else {
188 val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
189 val |= RECORD_RIGHT_CHNNEL;
190 }
191 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
192 break;
193 case 2:
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
196 else
197 val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
198 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
199 break;
200 default:
201 ret = -EINVAL;
202 }
203 spin_unlock_irqrestore(&nuc900_audio->lock, flags);
204 return ret;
205}
206
207static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
208{
209 int ret = 0;
210
211 switch (cmd) {
212 case SNDRV_PCM_TRIGGER_START:
213 case SNDRV_PCM_TRIGGER_RESUME:
214 nuc900_dma_start(substream);
215 break;
216
217 case SNDRV_PCM_TRIGGER_STOP:
218 case SNDRV_PCM_TRIGGER_SUSPEND:
219 nuc900_dma_stop(substream);
220 break;
221
222 default:
223 ret = -EINVAL;
224 break;
225 }
226
227 return ret;
228}
229
230static int nuc900_dma_getposition(struct snd_pcm_substream *substream,
231 dma_addr_t *src, dma_addr_t *dst)
232{
233 struct snd_pcm_runtime *runtime = substream->runtime;
234 struct nuc900_audio *nuc900_audio = runtime->private_data;
235
236 if (src != NULL)
237 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
238
239 if (dst != NULL)
240 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
241
242 return 0;
243}
244
245static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
246{
247 struct snd_pcm_runtime *runtime = substream->runtime;
248 dma_addr_t src, dst;
249 unsigned long res;
250
251 nuc900_dma_getposition(substream, &src, &dst);
252
253 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
254 res = dst - runtime->dma_addr;
255 else
256 res = src - runtime->dma_addr;
257
258 return bytes_to_frames(substream->runtime, res);
259}
260
261static int nuc900_dma_open(struct snd_pcm_substream *substream)
262{
263 struct snd_pcm_runtime *runtime = substream->runtime;
264 struct nuc900_audio *nuc900_audio;
265
266 snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
267
268 nuc900_audio = nuc900_ac97_data;
269
270 if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
271 0, "nuc900-dma", substream))
272 return -EBUSY;
273
274 runtime->private_data = nuc900_audio;
275
276 return 0;
277}
278
279static int nuc900_dma_close(struct snd_pcm_substream *substream)
280{
281 struct snd_pcm_runtime *runtime = substream->runtime;
282 struct nuc900_audio *nuc900_audio = runtime->private_data;
283
284 free_irq(nuc900_audio->irq_num, substream);
285
286 return 0;
287}
288
289static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
290 struct vm_area_struct *vma)
291{
292 struct snd_pcm_runtime *runtime = substream->runtime;
293
294 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
295 runtime->dma_area,
296 runtime->dma_addr,
297 runtime->dma_bytes);
298}
299
300static struct snd_pcm_ops nuc900_dma_ops = {
301 .open = nuc900_dma_open,
302 .close = nuc900_dma_close,
303 .ioctl = snd_pcm_lib_ioctl,
304 .hw_params = nuc900_dma_hw_params,
305 .hw_free = nuc900_dma_hw_free,
306 .prepare = nuc900_dma_prepare,
307 .trigger = nuc900_dma_trigger,
308 .pointer = nuc900_dma_pointer,
309 .mmap = nuc900_dma_mmap,
310};
311
312static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
313{
314 snd_pcm_lib_preallocate_free_for_all(pcm);
315}
316
317static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
318static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
319{
320 struct snd_card *card = rtd->card->snd_card;
321 struct snd_pcm *pcm = rtd->pcm;
322
323 if (!card->dev->dma_mask)
324 card->dev->dma_mask = &nuc900_pcm_dmamask;
325 if (!card->dev->coherent_dma_mask)
326 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
327
328 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
329 card->dev, 4 * 1024, (4 * 1024) - 1);
330
331 return 0;
332}
333
334static struct snd_soc_platform_driver nuc900_soc_platform = {
335 .ops = &nuc900_dma_ops,
336 .pcm_new = nuc900_dma_new,
337 .pcm_free = nuc900_dma_free_dma_buffers,
338};
339
340static int nuc900_soc_platform_probe(struct platform_device *pdev)
341{
342 return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
343}
344
345static int nuc900_soc_platform_remove(struct platform_device *pdev)
346{
347 snd_soc_unregister_platform(&pdev->dev);
348 return 0;
349}
350
351static struct platform_driver nuc900_pcm_driver = {
352 .driver = {
353 .name = "nuc900-pcm-audio",
354 .owner = THIS_MODULE,
355 },
356
357 .probe = nuc900_soc_platform_probe,
358 .remove = nuc900_soc_platform_remove,
359};
360
361module_platform_driver(nuc900_pcm_driver);
362
363MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
364MODULE_DESCRIPTION("nuc900 Audio DMA module");
365MODULE_LICENSE("GPL");
366
