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1082e270 WZ |
1 | /* |
2 | * Copyright (c) 2010 Nuvoton technology corporation. | |
3 | * | |
4 | * Wan ZongShun <mcuos.com@gmail.com> | |
5 | * | |
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. | |
9 | * | |
10 | */ | |
11 | ||
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 | ||
019afb58 | 26 | #include "nuc900-audio.h" |
1082e270 WZ |
27 | |
28 | static 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 | ||
45 | static 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; | |
018334c0 | 50 | unsigned long flags; |
1082e270 WZ |
51 | int ret = 0; |
52 | ||
53 | spin_lock_irqsave(&nuc900_audio->lock, flags); | |
54 | ||
55 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
56 | if (ret < 0) | |
57 | return ret; | |
58 | ||
59 | nuc900_audio->substream = substream; | |
018334c0 WZ |
60 | nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr; |
61 | nuc900_audio->buffersize[substream->stream] = | |
62 | params_buffer_bytes(params); | |
1082e270 WZ |
63 | |
64 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | static 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 | ||
018334c0 | 76 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
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 | ||
88 | static 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 | ||
99 | static 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 | ||
110 | static 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 | ||
161 | static int nuc900_dma_hw_free(struct snd_pcm_substream *substream) | |
162 | { | |
163 | snd_pcm_lib_free_pages(substream); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static 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; | |
018334c0 | 171 | unsigned long flags, val; |
1082e270 WZ |
172 | |
173 | spin_lock_irqsave(&nuc900_audio->lock, flags); | |
174 | ||
175 | nuc900_update_dma_register(substream, | |
018334c0 WZ |
176 | nuc900_audio->dma_addr[substream->stream], |
177 | nuc900_audio->buffersize[substream->stream]); | |
1082e270 WZ |
178 | |
179 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
180 | ||
181 | switch (runtime->channels) { | |
182 | case 1: | |
018334c0 | 183 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
184 | val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); |
185 | val |= PLAY_RIGHT_CHNNEL; | |
186 | } else { | |
187 | val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
188 | val |= RECORD_RIGHT_CHNNEL; | |
189 | } | |
190 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
191 | break; | |
192 | case 2: | |
018334c0 | 193 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
1082e270 WZ |
194 | val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); |
195 | else | |
196 | val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
197 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
198 | break; | |
199 | default: | |
200 | return -EINVAL; | |
201 | } | |
202 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd) | |
207 | { | |
208 | int ret = 0; | |
209 | ||
210 | switch (cmd) { | |
211 | case SNDRV_PCM_TRIGGER_START: | |
212 | case SNDRV_PCM_TRIGGER_RESUME: | |
213 | nuc900_dma_start(substream); | |
214 | break; | |
215 | ||
216 | case SNDRV_PCM_TRIGGER_STOP: | |
217 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
218 | nuc900_dma_stop(substream); | |
219 | break; | |
220 | ||
221 | default: | |
222 | ret = -EINVAL; | |
223 | break; | |
224 | } | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | int nuc900_dma_getposition(struct snd_pcm_substream *substream, | |
230 | dma_addr_t *src, dma_addr_t *dst) | |
231 | { | |
232 | struct snd_pcm_runtime *runtime = substream->runtime; | |
233 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
234 | ||
235 | if (src != NULL) | |
236 | *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC); | |
237 | ||
238 | if (dst != NULL) | |
239 | *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream) | |
245 | { | |
246 | struct snd_pcm_runtime *runtime = substream->runtime; | |
247 | dma_addr_t src, dst; | |
248 | unsigned long res; | |
249 | ||
250 | nuc900_dma_getposition(substream, &src, &dst); | |
251 | ||
252 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
253 | res = dst - runtime->dma_addr; | |
254 | else | |
255 | res = src - runtime->dma_addr; | |
256 | ||
257 | return bytes_to_frames(substream->runtime, res); | |
258 | } | |
259 | ||
260 | static int nuc900_dma_open(struct snd_pcm_substream *substream) | |
261 | { | |
262 | struct snd_pcm_runtime *runtime = substream->runtime; | |
263 | struct nuc900_audio *nuc900_audio; | |
264 | ||
265 | snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware); | |
266 | ||
267 | nuc900_audio = nuc900_ac97_data; | |
268 | ||
269 | if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt, | |
270 | IRQF_DISABLED, "nuc900-dma", substream)) | |
271 | return -EBUSY; | |
272 | ||
273 | runtime->private_data = nuc900_audio; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static int nuc900_dma_close(struct snd_pcm_substream *substream) | |
279 | { | |
280 | struct snd_pcm_runtime *runtime = substream->runtime; | |
281 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
282 | ||
283 | free_irq(nuc900_audio->irq_num, substream); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int nuc900_dma_mmap(struct snd_pcm_substream *substream, | |
289 | struct vm_area_struct *vma) | |
290 | { | |
291 | struct snd_pcm_runtime *runtime = substream->runtime; | |
292 | ||
293 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
294 | runtime->dma_area, | |
295 | runtime->dma_addr, | |
296 | runtime->dma_bytes); | |
297 | } | |
298 | ||
299 | static struct snd_pcm_ops nuc900_dma_ops = { | |
300 | .open = nuc900_dma_open, | |
301 | .close = nuc900_dma_close, | |
302 | .ioctl = snd_pcm_lib_ioctl, | |
303 | .hw_params = nuc900_dma_hw_params, | |
304 | .hw_free = nuc900_dma_hw_free, | |
305 | .prepare = nuc900_dma_prepare, | |
306 | .trigger = nuc900_dma_trigger, | |
307 | .pointer = nuc900_dma_pointer, | |
308 | .mmap = nuc900_dma_mmap, | |
309 | }; | |
310 | ||
311 | static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm) | |
312 | { | |
313 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
314 | } | |
315 | ||
316 | static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32); | |
317 | static int nuc900_dma_new(struct snd_card *card, | |
318 | struct snd_soc_dai *dai, struct snd_pcm *pcm) | |
319 | { | |
320 | if (!card->dev->dma_mask) | |
321 | card->dev->dma_mask = &nuc900_pcm_dmamask; | |
322 | if (!card->dev->coherent_dma_mask) | |
323 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
324 | ||
325 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
326 | card->dev, 4 * 1024, (4 * 1024) - 1); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
f0fba2ad LG |
331 | static struct snd_soc_platform_driver nuc900_soc_platform = { |
332 | .ops = &nuc900_dma_ops, | |
1082e270 WZ |
333 | .pcm_new = nuc900_dma_new, |
334 | .pcm_free = nuc900_dma_free_dma_buffers, | |
335 | } | |
1082e270 | 336 | |
f0fba2ad | 337 | static int __devinit nuc900_soc_platform_probe(struct platform_device *pdev) |
1082e270 | 338 | { |
f0fba2ad | 339 | return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform); |
1082e270 WZ |
340 | } |
341 | ||
f0fba2ad | 342 | static int __devexit nuc900_soc_platform_remove(struct platform_device *pdev) |
1082e270 | 343 | { |
f0fba2ad LG |
344 | snd_soc_unregister_platform(&pdev->dev); |
345 | return 0; | |
1082e270 WZ |
346 | } |
347 | ||
f0fba2ad LG |
348 | static struct platform_driver nuc900_pcm_driver = { |
349 | .driver = { | |
350 | .name = "nuc900-pcm-audio", | |
351 | .owner = THIS_MODULE, | |
352 | }, | |
353 | ||
354 | .probe = nuc900_soc_platform_probe, | |
355 | .remove = __devexit_p(nuc900_soc_platform_remove), | |
356 | }; | |
357 | ||
358 | static int __init nuc900_pcm_init(void) | |
359 | { | |
360 | return platform_driver_register(&nuc900_pcm_driver); | |
361 | } | |
362 | module_init(nuc900_pcm_init); | |
363 | ||
364 | static void __exit nuc900_pcm_exit(void) | |
365 | { | |
366 | platform_driver_unregister(&nuc900_pcm_driver); | |
367 | } | |
368 | module_exit(nuc900_pcm_exit); | |
1082e270 WZ |
369 | |
370 | MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>"); | |
371 | MODULE_DESCRIPTION("nuc900 Audio DMA module"); | |
372 | MODULE_LICENSE("GPL"); |