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 | ||
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, | |
1082e270 WZ |
35 | .buffer_bytes_max = 4*1024, |
36 | .period_bytes_min = 1*1024, | |
37 | .period_bytes_max = 4*1024, | |
38 | .periods_min = 1, | |
39 | .periods_max = 1024, | |
40 | }; | |
41 | ||
42 | static int nuc900_dma_hw_params(struct snd_pcm_substream *substream, | |
43 | struct snd_pcm_hw_params *params) | |
44 | { | |
45 | struct snd_pcm_runtime *runtime = substream->runtime; | |
46 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
018334c0 | 47 | unsigned long flags; |
1082e270 WZ |
48 | int ret = 0; |
49 | ||
1082e270 WZ |
50 | ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); |
51 | if (ret < 0) | |
52 | return ret; | |
53 | ||
3f1af9d2 AL |
54 | spin_lock_irqsave(&nuc900_audio->lock, flags); |
55 | ||
1082e270 | 56 | nuc900_audio->substream = substream; |
018334c0 WZ |
57 | nuc900_audio->dma_addr[substream->stream] = runtime->dma_addr; |
58 | nuc900_audio->buffersize[substream->stream] = | |
59 | params_buffer_bytes(params); | |
1082e270 WZ |
60 | |
61 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | static void nuc900_update_dma_register(struct snd_pcm_substream *substream, | |
67 | dma_addr_t dma_addr, size_t count) | |
68 | { | |
69 | struct snd_pcm_runtime *runtime = substream->runtime; | |
70 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
71 | void __iomem *mmio_addr, *mmio_len; | |
72 | ||
018334c0 | 73 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
74 | mmio_addr = nuc900_audio->mmio + ACTL_PDSTB; |
75 | mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH; | |
76 | } else { | |
77 | mmio_addr = nuc900_audio->mmio + ACTL_RDSTB; | |
78 | mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH; | |
79 | } | |
80 | ||
81 | AUDIO_WRITE(mmio_addr, dma_addr); | |
82 | AUDIO_WRITE(mmio_len, count); | |
83 | } | |
84 | ||
85 | static void nuc900_dma_start(struct snd_pcm_substream *substream) | |
86 | { | |
87 | struct snd_pcm_runtime *runtime = substream->runtime; | |
88 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
89 | unsigned long val; | |
90 | ||
91 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
92 | val |= (T_DMA_IRQ | R_DMA_IRQ); | |
93 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
94 | } | |
95 | ||
96 | static void nuc900_dma_stop(struct snd_pcm_substream *substream) | |
97 | { | |
98 | struct snd_pcm_runtime *runtime = substream->runtime; | |
99 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
100 | unsigned long val; | |
101 | ||
102 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
103 | val &= ~(T_DMA_IRQ | R_DMA_IRQ); | |
104 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
105 | } | |
106 | ||
107 | static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id) | |
108 | { | |
109 | struct snd_pcm_substream *substream = dev_id; | |
110 | struct nuc900_audio *nuc900_audio = substream->runtime->private_data; | |
111 | unsigned long val; | |
112 | ||
113 | spin_lock(&nuc900_audio->lock); | |
114 | ||
115 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
116 | ||
117 | if (val & R_DMA_IRQ) { | |
118 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ); | |
119 | ||
120 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); | |
121 | ||
122 | if (val & R_DMA_MIDDLE_IRQ) { | |
123 | val |= R_DMA_MIDDLE_IRQ; | |
124 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
125 | } | |
126 | ||
127 | if (val & R_DMA_END_IRQ) { | |
128 | val |= R_DMA_END_IRQ; | |
129 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val); | |
130 | } | |
131 | } else if (val & T_DMA_IRQ) { | |
132 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ); | |
133 | ||
134 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); | |
135 | ||
136 | if (val & P_DMA_MIDDLE_IRQ) { | |
137 | val |= P_DMA_MIDDLE_IRQ; | |
138 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
139 | } | |
140 | ||
141 | if (val & P_DMA_END_IRQ) { | |
142 | val |= P_DMA_END_IRQ; | |
143 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val); | |
144 | } | |
145 | } else { | |
146 | dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n"); | |
147 | spin_unlock(&nuc900_audio->lock); | |
148 | return IRQ_HANDLED; | |
149 | } | |
150 | ||
151 | spin_unlock(&nuc900_audio->lock); | |
152 | ||
153 | snd_pcm_period_elapsed(substream); | |
154 | ||
155 | return IRQ_HANDLED; | |
156 | } | |
157 | ||
158 | static int nuc900_dma_hw_free(struct snd_pcm_substream *substream) | |
159 | { | |
160 | snd_pcm_lib_free_pages(substream); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int nuc900_dma_prepare(struct snd_pcm_substream *substream) | |
165 | { | |
166 | struct snd_pcm_runtime *runtime = substream->runtime; | |
167 | struct nuc900_audio *nuc900_audio = runtime->private_data; | |
018334c0 | 168 | unsigned long flags, val; |
3f1af9d2 | 169 | int ret = 0; |
1082e270 WZ |
170 | |
171 | spin_lock_irqsave(&nuc900_audio->lock, flags); | |
172 | ||
173 | nuc900_update_dma_register(substream, | |
018334c0 WZ |
174 | nuc900_audio->dma_addr[substream->stream], |
175 | nuc900_audio->buffersize[substream->stream]); | |
1082e270 WZ |
176 | |
177 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
178 | ||
179 | switch (runtime->channels) { | |
180 | case 1: | |
018334c0 | 181 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
1082e270 WZ |
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: | |
018334c0 | 191 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
1082e270 WZ |
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: | |
3f1af9d2 | 198 | ret = -EINVAL; |
1082e270 WZ |
199 | } |
200 | spin_unlock_irqrestore(&nuc900_audio->lock, flags); | |
3f1af9d2 | 201 | return ret; |
1082e270 WZ |
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 | ||
49acf73b | 227 | static int nuc900_dma_getposition(struct snd_pcm_substream *substream, |
1082e270 WZ |
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, | |
88e24c3a | 268 | 0, "nuc900-dma", substream)) |
1082e270 WZ |
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 | ||
552d1ef6 | 314 | static int nuc900_dma_new(struct snd_soc_pcm_runtime *rtd) |
1082e270 | 315 | { |
552d1ef6 | 316 | struct snd_card *card = rtd->card->snd_card; |
552d1ef6 | 317 | struct snd_pcm *pcm = rtd->pcm; |
c9bd5e69 | 318 | int ret; |
552d1ef6 | 319 | |
c9bd5e69 RK |
320 | ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
321 | if (ret) | |
322 | return ret; | |
1082e270 WZ |
323 | |
324 | snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
325 | card->dev, 4 * 1024, (4 * 1024) - 1); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
f0fba2ad LG |
330 | static struct snd_soc_platform_driver nuc900_soc_platform = { |
331 | .ops = &nuc900_dma_ops, | |
1082e270 WZ |
332 | .pcm_new = nuc900_dma_new, |
333 | .pcm_free = nuc900_dma_free_dma_buffers, | |
a7a9820b | 334 | }; |
1082e270 | 335 | |
ce69ace5 | 336 | static int nuc900_soc_platform_probe(struct platform_device *pdev) |
1082e270 | 337 | { |
f0fba2ad | 338 | return snd_soc_register_platform(&pdev->dev, &nuc900_soc_platform); |
1082e270 WZ |
339 | } |
340 | ||
ce69ace5 | 341 | static int nuc900_soc_platform_remove(struct platform_device *pdev) |
1082e270 | 342 | { |
f0fba2ad LG |
343 | snd_soc_unregister_platform(&pdev->dev); |
344 | return 0; | |
1082e270 WZ |
345 | } |
346 | ||
f0fba2ad LG |
347 | static struct platform_driver nuc900_pcm_driver = { |
348 | .driver = { | |
349 | .name = "nuc900-pcm-audio", | |
350 | .owner = THIS_MODULE, | |
351 | }, | |
352 | ||
353 | .probe = nuc900_soc_platform_probe, | |
ce69ace5 | 354 | .remove = nuc900_soc_platform_remove, |
f0fba2ad LG |
355 | }; |
356 | ||
d0efa6a2 | 357 | module_platform_driver(nuc900_pcm_driver); |
1082e270 WZ |
358 | |
359 | MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>"); | |
360 | MODULE_DESCRIPTION("nuc900 Audio DMA module"); | |
361 | MODULE_LICENSE("GPL"); |