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1082e270 WZ |
1 | /* |
2 | * Copyright (c) 2009-2010 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/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/mutex.h> | |
18 | #include <linux/suspend.h> | |
19 | #include <sound/core.h> | |
20 | #include <sound/pcm.h> | |
21 | #include <sound/initval.h> | |
22 | #include <sound/soc.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/clk.h> | |
25 | ||
26 | #include <mach/mfp.h> | |
27 | ||
28 | #include "nuc900-auido.h" | |
29 | ||
30 | static DEFINE_MUTEX(ac97_mutex); | |
31 | struct nuc900_audio *nuc900_ac97_data; | |
32 | ||
33 | static int nuc900_checkready(void) | |
34 | { | |
35 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
36 | ||
37 | if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY)) | |
38 | return -EPERM; | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | /* AC97 controller reads codec register */ | |
44 | static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97, | |
45 | unsigned short reg) | |
46 | { | |
47 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
48 | unsigned long timeout = 0x10000, val; | |
49 | ||
50 | mutex_lock(&ac97_mutex); | |
51 | ||
52 | val = nuc900_checkready(); | |
53 | if (!!val) { | |
54 | dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); | |
55 | goto out; | |
56 | } | |
57 | ||
58 | /* set the R_WB bit and write register index */ | |
59 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg); | |
60 | ||
61 | /* set the valid frame bit and valid slots */ | |
62 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); | |
63 | val |= (VALID_FRAME | SLOT1_VALID); | |
64 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); | |
65 | ||
66 | udelay(100); | |
67 | ||
68 | /* polling the AC_R_FINISH */ | |
69 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); | |
70 | val &= AC_R_FINISH; | |
71 | while (!val && timeout--) | |
72 | mdelay(1); | |
73 | ||
74 | if (!timeout) { | |
75 | dev_err(nuc900_audio->dev, "AC97 read register time out !\n"); | |
76 | val = -EPERM; | |
77 | goto out; | |
78 | } | |
79 | ||
80 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ; | |
81 | val &= ~SLOT1_VALID; | |
82 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); | |
83 | ||
84 | if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) { | |
85 | dev_err(nuc900_audio->dev, | |
86 | "R_INDEX of REG_ACTL_ACIS1 not match!\n"); | |
87 | } | |
88 | ||
89 | udelay(100); | |
90 | val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF); | |
91 | ||
92 | out: | |
93 | mutex_unlock(&ac97_mutex); | |
94 | return val; | |
95 | } | |
96 | ||
97 | /* AC97 controller writes to codec register */ | |
98 | static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg, | |
99 | unsigned short val) | |
100 | { | |
101 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
102 | unsigned long tmp, timeout = 0x10000; | |
103 | ||
104 | mutex_lock(&ac97_mutex); | |
105 | ||
106 | tmp = nuc900_checkready(); | |
107 | if (!!tmp) | |
108 | dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); | |
109 | ||
110 | /* clear the R_WB bit and write register index */ | |
111 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg); | |
112 | ||
113 | /* write register value */ | |
114 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val); | |
115 | ||
116 | /* set the valid frame bit and valid slots */ | |
117 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); | |
118 | tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME; | |
119 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); | |
120 | ||
121 | udelay(100); | |
122 | ||
123 | /* polling the AC_W_FINISH */ | |
124 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); | |
125 | tmp &= AC_W_FINISH; | |
126 | while (tmp && timeout--) | |
127 | mdelay(1); | |
128 | ||
129 | if (!timeout) | |
130 | dev_err(nuc900_audio->dev, "AC97 write register time out !\n"); | |
131 | ||
132 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); | |
133 | tmp &= ~(SLOT1_VALID | SLOT2_VALID); | |
134 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); | |
135 | ||
136 | mutex_unlock(&ac97_mutex); | |
137 | ||
138 | } | |
139 | ||
140 | static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97) | |
141 | { | |
142 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
143 | unsigned long val; | |
144 | ||
145 | mutex_lock(&ac97_mutex); | |
146 | ||
147 | /* warm reset AC 97 */ | |
148 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); | |
149 | val |= AC_W_RES; | |
150 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); | |
151 | ||
152 | udelay(1000); | |
153 | ||
154 | val = nuc900_checkready(); | |
155 | if (!!val) | |
156 | dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); | |
157 | ||
158 | mutex_unlock(&ac97_mutex); | |
159 | } | |
160 | ||
161 | static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97) | |
162 | { | |
163 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
164 | unsigned long val; | |
165 | ||
166 | mutex_lock(&ac97_mutex); | |
167 | ||
168 | /* reset Audio Controller */ | |
169 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
170 | val |= ACTL_RESET_BIT; | |
171 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
172 | ||
173 | udelay(1000); | |
174 | ||
175 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
176 | val &= (~ACTL_RESET_BIT); | |
177 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
178 | ||
179 | udelay(1000); | |
180 | ||
181 | /* reset AC-link interface */ | |
182 | ||
183 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
184 | val |= AC_RESET; | |
185 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
186 | ||
187 | udelay(1000); | |
188 | ||
189 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
190 | val &= ~AC_RESET; | |
191 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
192 | ||
193 | udelay(1000); | |
194 | ||
195 | /* cold reset AC 97 */ | |
196 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); | |
197 | val |= AC_C_RES; | |
198 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); | |
199 | ||
200 | udelay(1000); | |
201 | ||
202 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); | |
203 | val &= (~AC_C_RES); | |
204 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); | |
205 | ||
206 | udelay(1000); | |
207 | ||
208 | mutex_unlock(&ac97_mutex); | |
209 | ||
210 | } | |
211 | ||
212 | /* AC97 controller operations */ | |
213 | struct snd_ac97_bus_ops soc_ac97_ops = { | |
214 | .read = nuc900_ac97_read, | |
215 | .write = nuc900_ac97_write, | |
216 | .reset = nuc900_ac97_cold_reset, | |
217 | .warm_reset = nuc900_ac97_warm_reset, | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(soc_ac97_ops); | |
220 | ||
221 | static int nuc900_ac97_trigger(struct snd_pcm_substream *substream, | |
222 | int cmd, struct snd_soc_dai *dai) | |
223 | { | |
224 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
225 | int ret, stype = SUBSTREAM_TYPE(substream); | |
226 | unsigned long val, tmp; | |
227 | ||
228 | ret = 0; | |
229 | ||
230 | switch (cmd) { | |
231 | case SNDRV_PCM_TRIGGER_START: | |
232 | case SNDRV_PCM_TRIGGER_RESUME: | |
233 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
234 | if (PCM_TX == stype) { | |
235 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); | |
236 | tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME); | |
237 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); | |
238 | ||
239 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); | |
240 | tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ); | |
241 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp); | |
242 | val |= AC_PLAY; | |
243 | } else { | |
244 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); | |
245 | tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ); | |
246 | ||
247 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp); | |
248 | val |= AC_RECORD; | |
249 | } | |
250 | ||
251 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
252 | ||
253 | break; | |
254 | case SNDRV_PCM_TRIGGER_STOP: | |
255 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
256 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); | |
257 | if (PCM_TX == stype) { | |
258 | tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); | |
259 | tmp &= ~(SLOT3_VALID | SLOT4_VALID); | |
260 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); | |
261 | ||
262 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR); | |
263 | val &= ~AC_PLAY; | |
264 | } else { | |
265 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR); | |
266 | val &= ~AC_RECORD; | |
267 | } | |
268 | ||
269 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); | |
270 | ||
271 | break; | |
272 | default: | |
273 | ret = -EINVAL; | |
274 | } | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | static int nuc900_ac97_probe(struct platform_device *pdev, | |
280 | struct snd_soc_dai *dai) | |
281 | { | |
282 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
283 | unsigned long val; | |
284 | ||
285 | mutex_lock(&ac97_mutex); | |
286 | ||
287 | /* enable unit clock */ | |
288 | clk_enable(nuc900_audio->clk); | |
289 | ||
290 | /* enable audio controller and AC-link interface */ | |
291 | val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); | |
292 | val |= (IIS_AC_PIN_SEL | ACLINK_EN); | |
293 | AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); | |
294 | ||
295 | mutex_unlock(&ac97_mutex); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static void nuc900_ac97_remove(struct platform_device *pdev, | |
301 | struct snd_soc_dai *dai) | |
302 | { | |
303 | struct nuc900_audio *nuc900_audio = nuc900_ac97_data; | |
304 | ||
305 | clk_disable(nuc900_audio->clk); | |
306 | } | |
307 | ||
308 | static struct snd_soc_dai_ops nuc900_ac97_dai_ops = { | |
309 | .trigger = nuc900_ac97_trigger, | |
310 | }; | |
311 | ||
312 | struct snd_soc_dai nuc900_ac97_dai = { | |
313 | .name = "nuc900-ac97", | |
314 | .probe = nuc900_ac97_probe, | |
315 | .remove = nuc900_ac97_remove, | |
316 | .ac97_control = 1, | |
317 | .playback = { | |
318 | .rates = SNDRV_PCM_RATE_8000_48000, | |
319 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
320 | .channels_min = 1, | |
321 | .channels_max = 2, | |
322 | }, | |
323 | .capture = { | |
324 | .rates = SNDRV_PCM_RATE_8000_48000, | |
325 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
326 | .channels_min = 1, | |
327 | .channels_max = 2, | |
328 | }, | |
329 | .ops = &nuc900_ac97_dai_ops, | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(nuc900_ac97_dai); | |
332 | ||
333 | static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev) | |
334 | { | |
335 | struct nuc900_audio *nuc900_audio; | |
336 | int ret; | |
337 | ||
338 | if (nuc900_ac97_data) | |
339 | return -EBUSY; | |
340 | ||
341 | nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL); | |
342 | if (!nuc900_audio) | |
343 | return -ENOMEM; | |
344 | ||
345 | spin_lock_init(&nuc900_audio->lock); | |
346 | ||
347 | nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
348 | if (!nuc900_audio->res) { | |
349 | ret = -ENODEV; | |
350 | goto out0; | |
351 | } | |
352 | ||
353 | if (!request_mem_region(nuc900_audio->res->start, | |
354 | resource_size(nuc900_audio->res), pdev->name)) { | |
355 | ret = -EBUSY; | |
356 | goto out0; | |
357 | } | |
358 | ||
359 | nuc900_audio->mmio = ioremap(nuc900_audio->res->start, | |
360 | resource_size(nuc900_audio->res)); | |
361 | if (!nuc900_audio->mmio) { | |
362 | ret = -ENOMEM; | |
363 | goto out1; | |
364 | } | |
365 | ||
366 | nuc900_audio->clk = clk_get(&pdev->dev, NULL); | |
367 | if (IS_ERR(nuc900_audio->clk)) { | |
368 | ret = PTR_ERR(nuc900_audio->clk); | |
369 | goto out2; | |
370 | } | |
371 | ||
372 | nuc900_audio->irq_num = platform_get_irq(pdev, 0); | |
373 | if (!nuc900_audio->irq_num) { | |
374 | ret = -EBUSY; | |
375 | goto out2; | |
376 | } | |
377 | ||
378 | nuc900_ac97_data = nuc900_audio; | |
379 | ||
380 | nuc900_audio->dev = nuc900_ac97_dai.dev = &pdev->dev; | |
381 | ||
382 | ret = snd_soc_register_dai(&nuc900_ac97_dai); | |
383 | if (ret) | |
384 | goto out3; | |
385 | ||
386 | mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/ | |
387 | ||
388 | return 0; | |
389 | ||
390 | out3: | |
391 | clk_put(nuc900_audio->clk); | |
392 | out2: | |
393 | iounmap(nuc900_audio->mmio); | |
394 | out1: | |
395 | release_mem_region(nuc900_audio->res->start, | |
396 | resource_size(nuc900_audio->res)); | |
397 | out0: | |
398 | kfree(nuc900_audio); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev) | |
403 | { | |
404 | ||
405 | snd_soc_unregister_dai(&nuc900_ac97_dai); | |
406 | ||
407 | clk_put(nuc900_ac97_data->clk); | |
408 | iounmap(nuc900_ac97_data->mmio); | |
409 | release_mem_region(nuc900_ac97_data->res->start, | |
410 | resource_size(nuc900_ac97_data->res)); | |
411 | ||
412 | nuc900_ac97_data = NULL; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static struct platform_driver nuc900_ac97_driver = { | |
418 | .driver = { | |
419 | .name = "nuc900-audio", | |
420 | .owner = THIS_MODULE, | |
421 | }, | |
422 | .probe = nuc900_ac97_drvprobe, | |
423 | .remove = __devexit_p(nuc900_ac97_drvremove), | |
424 | }; | |
425 | ||
426 | static int __init nuc900_ac97_init(void) | |
427 | { | |
428 | return platform_driver_register(&nuc900_ac97_driver); | |
429 | } | |
430 | ||
431 | static void __exit nuc900_ac97_exit(void) | |
432 | { | |
433 | platform_driver_unregister(&nuc900_ac97_driver); | |
434 | } | |
435 | ||
436 | module_init(nuc900_ac97_init); | |
437 | module_exit(nuc900_ac97_exit); | |
438 | ||
439 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
440 | MODULE_DESCRIPTION("NUC900 AC97 SoC driver!"); | |
441 | MODULE_LICENSE("GPL"); | |
442 | MODULE_ALIAS("platform:nuc900-ac97"); |