Commit | Line | Data |
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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 | ||
26 | #include "nuc900-auido.h" | |
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; | |
50 | unsigned long flags, stype = SUBSTREAM_TYPE(substream); | |
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; | |
60 | nuc900_audio->dma_addr[stype] = runtime->dma_addr; | |
61 | nuc900_audio->buffersize[stype] = params_buffer_bytes(params); | |
62 | ||
63 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
68 | static void nuc900_update_dma_register(struct snd_pcm_substream *substream, | |
69 | dma_addr_t dma_addr, size_t count) | |
70 | { | |
71 | struct snd_pcm_runtime *runtime = substream->runtime; | |
72 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
73 | void __iomem *mmio_addr, *mmio_len; | |
74 | ||
75 | if (SUBSTREAM_TYPE(substream) == PCM_TX) { | |
76 | mmio_addr = nuc900_audio->mmio + ACTL_PDSTB; | |
77 | mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH; | |
78 | } else { | |
79 | mmio_addr = nuc900_audio->mmio + ACTL_RDSTB; | |
80 | mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH; | |
81 | } | |
82 | ||
83 | AUDIO_WRITE(mmio_addr, dma_addr); | |
84 | AUDIO_WRITE(mmio_len, count); | |
85 | } | |
86 | ||
87 | static void nuc900_dma_start(struct snd_pcm_substream *substream) | |
88 | { | |
89 | struct snd_pcm_runtime *runtime = substream->runtime; | |
90 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
91 | unsigned long val; | |
92 | ||
93 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
94 | val |= (T_DMA_IRQ | R_DMA_IRQ); | |
95 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
96 | } | |
97 | ||
98 | static void nuc900_dma_stop(struct snd_pcm_substream *substream) | |
99 | { | |
100 | struct snd_pcm_runtime *runtime = substream->runtime; | |
101 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
102 | unsigned long val; | |
103 | ||
104 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
105 | val &= ~(T_DMA_IRQ | R_DMA_IRQ); | |
106 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
107 | } | |
108 | ||
109 | static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id) | |
110 | { | |
111 | struct snd_pcm_substream *substream = dev_id; | |
112 | struct nuc900_audio *nuc900_audio = substream->runtime->private_data; | |
113 | unsigned long val; | |
114 | ||
115 | spin_lock(&nuc900_audio->lock); | |
116 | ||
117 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
118 | ||
119 | if (val & R_DMA_IRQ) { | |
120 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ); | |
121 | ||
122 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); | |
123 | ||
124 | if (val & R_DMA_MIDDLE_IRQ) { | |
125 | val |= R_DMA_MIDDLE_IRQ; | |
126 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
127 | } | |
128 | ||
129 | if (val & R_DMA_END_IRQ) { | |
130 | val |= R_DMA_END_IRQ; | |
131 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
132 | } | |
133 | } else if (val & T_DMA_IRQ) { | |
134 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ); | |
135 | ||
136 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); | |
137 | ||
138 | if (val & P_DMA_MIDDLE_IRQ) { | |
139 | val |= P_DMA_MIDDLE_IRQ; | |
140 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
141 | } | |
142 | ||
143 | if (val & P_DMA_END_IRQ) { | |
144 | val |= P_DMA_END_IRQ; | |
145 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
146 | } | |
147 | } else { | |
148 | dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n"); | |
149 | spin_unlock(&nuc900_audio->lock); | |
150 | return IRQ_HANDLED; | |
151 | } | |
152 | ||
153 | spin_unlock(&nuc900_audio->lock); | |
154 | ||
155 | snd_pcm_period_elapsed(substream); | |
156 | ||
157 | return IRQ_HANDLED; | |
158 | } | |
159 | ||
160 | static int nuc900_dma_hw_free(struct snd_pcm_substream *substream) | |
161 | { | |
162 | snd_pcm_lib_free_pages(substream); | |
163 | return 0; | |
164 | } | |
165 | ||
166 | static int nuc900_dma_prepare(struct snd_pcm_substream *substream) | |
167 | { | |
168 | struct snd_pcm_runtime *runtime = substream->runtime; | |
169 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
170 | unsigned long flags, val, stype = SUBSTREAM_TYPE(substream);; | |
171 | ||
172 | spin_lock_irqsave(&nuc900_audio->lock, flags); | |
173 | ||
174 | nuc900_update_dma_register(substream, | |
175 | nuc900_audio->dma_addr[stype], nuc900_audio->buffersize[stype]); | |
176 | ||
177 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
178 | ||
179 | switch (runtime->channels) { | |
180 | case 1: | |
181 | if (PCM_TX == stype) { | |
182 | val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); | |
183 | val |= PLAY_RIGHT_CHNNEL; | |
184 | } else { | |
185 | val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
186 | val |= RECORD_RIGHT_CHNNEL; | |
187 | } | |
188 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
189 | break; | |
190 | case 2: | |
191 | if (PCM_TX == stype) | |
192 | val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL); | |
193 | else | |
194 | val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL); | |
195 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
196 | break; | |
197 | default: | |
198 | return -EINVAL; | |
199 | } | |
200 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd) | |
205 | { | |
206 | int ret = 0; | |
207 | ||
208 | switch (cmd) { | |
209 | case SNDRV_PCM_TRIGGER_START: | |
210 | case SNDRV_PCM_TRIGGER_RESUME: | |
211 | nuc900_dma_start(substream); | |
212 | break; | |
213 | ||
214 | case SNDRV_PCM_TRIGGER_STOP: | |
215 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
216 | nuc900_dma_stop(substream); | |
217 | break; | |
218 | ||
219 | default: | |
220 | ret = -EINVAL; | |
221 | break; | |
222 | } | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | int nuc900_dma_getposition(struct snd_pcm_substream *substream, | |
228 | dma_addr_t *src, dma_addr_t *dst) | |
229 | { | |
230 | struct snd_pcm_runtime *runtime = substream->runtime; | |
231 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
232 | ||
233 | if (src != NULL) | |
234 | *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC); | |
235 | ||
236 | if (dst != NULL) | |
237 | *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream) | |
243 | { | |
244 | struct snd_pcm_runtime *runtime = substream->runtime; | |
245 | dma_addr_t src, dst; | |
246 | unsigned long res; | |
247 | ||
248 | nuc900_dma_getposition(substream, &src, &dst); | |
249 | ||
250 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
251 | res = dst - runtime->dma_addr; | |
252 | else | |
253 | res = src - runtime->dma_addr; | |
254 | ||
255 | return bytes_to_frames(substream->runtime, res); | |
256 | } | |
257 | ||
258 | static int nuc900_dma_open(struct snd_pcm_substream *substream) | |
259 | { | |
260 | struct snd_pcm_runtime *runtime = substream->runtime; | |
261 | struct nuc900_audio *nuc900_audio; | |
262 | ||
263 | snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware); | |
264 | ||
265 | nuc900_audio = nuc900_ac97_data; | |
266 | ||
267 | if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt, | |
268 | IRQF_DISABLED, "nuc900-dma", substream)) | |
269 | return -EBUSY; | |
270 | ||
271 | runtime->private_data = nuc900_audio; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int nuc900_dma_close(struct snd_pcm_substream *substream) | |
277 | { | |
278 | struct snd_pcm_runtime *runtime = substream->runtime; | |
279 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
280 | ||
281 | free_irq(nuc900_audio->irq_num, substream); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int nuc900_dma_mmap(struct snd_pcm_substream *substream, | |
287 | struct vm_area_struct *vma) | |
288 | { | |
289 | struct snd_pcm_runtime *runtime = substream->runtime; | |
290 | ||
291 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
292 | runtime->dma_area, | |
293 | runtime->dma_addr, | |
294 | runtime->dma_bytes); | |
295 | } | |
296 | ||
297 | static struct snd_pcm_ops nuc900_dma_ops = { | |
298 | .open = nuc900_dma_open, | |
299 | .close = nuc900_dma_close, | |
300 | .ioctl = snd_pcm_lib_ioctl, | |
301 | .hw_params = nuc900_dma_hw_params, | |
302 | .hw_free = nuc900_dma_hw_free, | |
303 | .prepare = nuc900_dma_prepare, | |
304 | .trigger = nuc900_dma_trigger, | |
305 | .pointer = nuc900_dma_pointer, | |
306 | .mmap = nuc900_dma_mmap, | |
307 | }; | |
308 | ||
309 | static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm) | |
310 | { | |
311 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
312 | } | |
313 | ||
314 | static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32); | |
315 | static int nuc900_dma_new(struct snd_card *card, | |
316 | struct snd_soc_dai *dai, struct snd_pcm *pcm) | |
317 | { | |
318 | if (!card->dev->dma_mask) | |
319 | card->dev->dma_mask = &nuc900_pcm_dmamask; | |
320 | if (!card->dev->coherent_dma_mask) | |
321 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
322 | ||
323 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
324 | card->dev, 4 * 1024, (4 * 1024) - 1); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | struct snd_soc_platform nuc900_soc_platform = { | |
330 | .name = "nuc900-dma", | |
331 | .pcm_ops = &nuc900_dma_ops, | |
332 | .pcm_new = nuc900_dma_new, | |
333 | .pcm_free = nuc900_dma_free_dma_buffers, | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(nuc900_soc_platform); | |
336 | ||
337 | static int __init nuc900_soc_platform_init(void) | |
338 | { | |
339 | return snd_soc_register_platform(&nuc900_soc_platform); | |
340 | } | |
341 | ||
342 | static void __exit nuc900_soc_platform_exit(void) | |
343 | { | |
344 | snd_soc_unregister_platform(&nuc900_soc_platform); | |
345 | } | |
346 | ||
347 | module_init(nuc900_soc_platform_init); | |
348 | module_exit(nuc900_soc_platform_exit); | |
349 | ||
350 | MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>"); | |
351 | MODULE_DESCRIPTION("nuc900 Audio DMA module"); | |
352 | MODULE_LICENSE("GPL"); |