2 * Copyright (c) 2010 Nuvoton technology corporation.
4 * Wan ZongShun <mcuos.com@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation;version 2 of the License.
12 #include <linux/module.h>
13 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/dma-mapping.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
24 #include <mach/hardware.h>
26 #include "nuc900-audio.h"
28 static const struct snd_pcm_hardware nuc900_pcm_hardware = {
29 .info = SNDRV_PCM_INFO_INTERLEAVED |
30 SNDRV_PCM_INFO_BLOCK_TRANSFER |
32 SNDRV_PCM_INFO_MMAP_VALID |
33 SNDRV_PCM_INFO_PAUSE |
34 SNDRV_PCM_INFO_RESUME,
35 .formats = SNDRV_PCM_FMTBIT_S16_LE,
38 .buffer_bytes_max = 4*1024,
39 .period_bytes_min = 1*1024,
40 .period_bytes_max = 4*1024,
45 static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
46 struct snd_pcm_hw_params *params)
48 struct snd_pcm_runtime *runtime = substream->runtime;
49 struct nuc900_audio *nuc900_audio = runtime->private_data;
53 ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
57 spin_lock_irqsave(&nuc900_audio->lock, flags);
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);
64 spin_unlock_irqrestore(&nuc900_audio->lock, flags);
69 static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
70 dma_addr_t dma_addr, size_t count)
72 struct snd_pcm_runtime *runtime = substream->runtime;
73 struct nuc900_audio *nuc900_audio = runtime->private_data;
74 void __iomem *mmio_addr, *mmio_len;
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;
80 mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
81 mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
84 AUDIO_WRITE(mmio_addr, dma_addr);
85 AUDIO_WRITE(mmio_len, count);
88 static void nuc900_dma_start(struct snd_pcm_substream *substream)
90 struct snd_pcm_runtime *runtime = substream->runtime;
91 struct nuc900_audio *nuc900_audio = runtime->private_data;
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);
99 static void nuc900_dma_stop(struct snd_pcm_substream *substream)
101 struct snd_pcm_runtime *runtime = substream->runtime;
102 struct nuc900_audio *nuc900_audio = runtime->private_data;
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);
110 static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
112 struct snd_pcm_substream *substream = dev_id;
113 struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
116 spin_lock(&nuc900_audio->lock);
118 val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
120 if (val & R_DMA_IRQ) {
121 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
123 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
125 if (val & R_DMA_MIDDLE_IRQ) {
126 val |= R_DMA_MIDDLE_IRQ;
127 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
130 if (val & R_DMA_END_IRQ) {
131 val |= R_DMA_END_IRQ;
132 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
134 } else if (val & T_DMA_IRQ) {
135 AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
137 val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
139 if (val & P_DMA_MIDDLE_IRQ) {
140 val |= P_DMA_MIDDLE_IRQ;
141 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
144 if (val & P_DMA_END_IRQ) {
145 val |= P_DMA_END_IRQ;
146 AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
149 dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
150 spin_unlock(&nuc900_audio->lock);
154 spin_unlock(&nuc900_audio->lock);
156 snd_pcm_period_elapsed(substream);
161 static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
163 snd_pcm_lib_free_pages(substream);
167 static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
169 struct snd_pcm_runtime *runtime = substream->runtime;
170 struct nuc900_audio *nuc900_audio = runtime->private_data;
171 unsigned long flags, val;
174 spin_lock_irqsave(&nuc900_audio->lock, flags);
176 nuc900_update_dma_register(substream,
177 nuc900_audio->dma_addr[substream->stream],
178 nuc900_audio->buffersize[substream->stream]);
180 val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
182 switch (runtime->channels) {
184 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
185 val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
186 val |= PLAY_RIGHT_CHNNEL;
188 val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
189 val |= RECORD_RIGHT_CHNNEL;
191 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
197 val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
198 AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
203 spin_unlock_irqrestore(&nuc900_audio->lock, flags);
207 static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
212 case SNDRV_PCM_TRIGGER_START:
213 case SNDRV_PCM_TRIGGER_RESUME:
214 nuc900_dma_start(substream);
217 case SNDRV_PCM_TRIGGER_STOP:
218 case SNDRV_PCM_TRIGGER_SUSPEND:
219 nuc900_dma_stop(substream);
230 int nuc900_dma_getposition(struct snd_pcm_substream *substream,
231 dma_addr_t *src, dma_addr_t *dst)
233 struct snd_pcm_runtime *runtime = substream->runtime;
234 struct nuc900_audio *nuc900_audio = runtime->private_data;
237 *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
240 *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
245 static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
247 struct snd_pcm_runtime *runtime = substream->runtime;
251 nuc900_dma_getposition(substream, &src, &dst);
253 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
254 res = dst - runtime->dma_addr;
256 res = src - runtime->dma_addr;
258 return bytes_to_frames(substream->runtime, res);
261 static int nuc900_dma_open(struct snd_pcm_substream *substream)
263 struct snd_pcm_runtime *runtime = substream->runtime;
264 struct nuc900_audio *nuc900_audio;
266 snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
268 nuc900_audio = nuc900_ac97_data;
270 if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
271 IRQF_DISABLED, "nuc900-dma", substream))
274 runtime->private_data = nuc900_audio;
279 static int nuc900_dma_close(struct snd_pcm_substream *substream)
281 struct snd_pcm_runtime *runtime = substream->runtime;
282 struct nuc900_audio *nuc900_audio = runtime->private_data;
284 free_irq(nuc900_audio->irq_num, substream);
289 static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
290 struct vm_area_struct *vma)
292 struct snd_pcm_runtime *runtime = substream->runtime;
294 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
300 static 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,
312 static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
314 snd_pcm_lib_preallocate_free_for_all(pcm);
317 static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
318 static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd)
320 struct snd_card *card = rtd->card->snd_card;
321 struct snd_soc_dai *dai = rtd->cpu_dai;
322 struct snd_pcm *pcm = rtd->pcm;
324 if (!card->dev->dma_mask)
325 card->dev->dma_mask = &nuc900_pcm_dmamask;
326 if (!card->dev->coherent_dma_mask)
327 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
329 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
330 card->dev, 4 * 1024, (4 * 1024) - 1);
335 static struct snd_soc_platform_driver nuc900_soc_platform = {
336 .ops = &nuc900_dma_ops,
337 .pcm_new = nuc900_dma_new,
338 .pcm_free = nuc900_dma_free_dma_buffers,
341 static int __devinit nuc900_soc_platform_probe(struct platform_device *pdev)
343 return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform);
346 static int __devexit nuc900_soc_platform_remove(struct platform_device *pdev)
348 snd_soc_unregister_platform(&pdev->dev);
352 static struct platform_driver nuc900_pcm_driver = {
354 .name = "nuc900-pcm-audio",
355 .owner = THIS_MODULE,
358 .probe = nuc900_soc_platform_probe,
359 .remove = __devexit_p(nuc900_soc_platform_remove),
362 static int __init nuc900_pcm_init(void)
364 return platform_driver_register(&nuc900_pcm_driver);
366 module_init(nuc900_pcm_init);
368 static void __exit nuc900_pcm_exit(void)
370 platform_driver_unregister(&nuc900_pcm_driver);
372 module_exit(nuc900_pcm_exit);
374 MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
375 MODULE_DESCRIPTION("nuc900 Audio DMA module");
376 MODULE_LICENSE("GPL");