1 /*
2 * kirkwood-i2s.c
3 *
4 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/io.h>
17 #include <linux/slab.h>
18 #include <linux/mbus.h>
19 #include <linux/delay.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
23 #include <plat/audio.h>
24 #include "kirkwood.h"
25
26 #define DRV_NAME "kirkwood-i2s"
27
28 #define KIRKWOOD_I2S_RATES \
29 (SNDRV_PCM_RATE_44100 | \
30 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
31 #define KIRKWOOD_I2S_FORMATS \
32 (SNDRV_PCM_FMTBIT_S16_LE | \
33 SNDRV_PCM_FMTBIT_S24_LE | \
34 SNDRV_PCM_FMTBIT_S32_LE)
35
kirkwood_i2s_set_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)36 static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
37 unsigned int fmt)
38 {
39 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
40 unsigned long mask;
41 unsigned long value;
42
43 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
44 case SND_SOC_DAIFMT_RIGHT_J:
45 mask = KIRKWOOD_I2S_CTL_RJ;
46 break;
47 case SND_SOC_DAIFMT_LEFT_J:
48 mask = KIRKWOOD_I2S_CTL_LJ;
49 break;
50 case SND_SOC_DAIFMT_I2S:
51 mask = KIRKWOOD_I2S_CTL_I2S;
52 break;
53 default:
54 return -EINVAL;
55 }
56
57 /*
58 * Set same format for playback and record
59 * This avoids some troubles.
60 */
61 value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
62 value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
63 value |= mask;
64 writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
65
66 value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
67 value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
68 value |= mask;
69 writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
70
71 return 0;
72 }
73
kirkwood_set_dco(void __iomem * io,unsigned long rate)74 static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
75 {
76 unsigned long value;
77
78 value = KIRKWOOD_DCO_CTL_OFFSET_0;
79 switch (rate) {
80 default:
81 case 44100:
82 value |= KIRKWOOD_DCO_CTL_FREQ_11;
83 break;
84 case 48000:
85 value |= KIRKWOOD_DCO_CTL_FREQ_12;
86 break;
87 case 96000:
88 value |= KIRKWOOD_DCO_CTL_FREQ_24;
89 break;
90 }
91 writel(value, io + KIRKWOOD_DCO_CTL);
92
93 /* wait for dco locked */
94 do {
95 cpu_relax();
96 value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
97 value &= KIRKWOOD_DCO_SPCR_STATUS;
98 } while (value == 0);
99 }
100
kirkwood_i2s_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)101 static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
102 struct snd_soc_dai *dai)
103 {
104 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
105
106 snd_soc_dai_set_dma_data(dai, substream, priv);
107 return 0;
108 }
109
kirkwood_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)110 static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
111 struct snd_pcm_hw_params *params,
112 struct snd_soc_dai *dai)
113 {
114 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
115 unsigned int i2s_reg, reg;
116 unsigned long i2s_value, value;
117
118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
119 i2s_reg = KIRKWOOD_I2S_PLAYCTL;
120 reg = KIRKWOOD_PLAYCTL;
121 } else {
122 i2s_reg = KIRKWOOD_I2S_RECCTL;
123 reg = KIRKWOOD_RECCTL;
124 }
125
126 /* set dco conf */
127 kirkwood_set_dco(priv->io, params_rate(params));
128
129 i2s_value = readl(priv->io+i2s_reg);
130 i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
131
132 value = readl(priv->io+reg);
133 value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
134
135 /*
136 * Size settings in play/rec i2s control regs and play/rec control
137 * regs must be the same.
138 */
139 switch (params_format(params)) {
140 case SNDRV_PCM_FORMAT_S16_LE:
141 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
142 value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
143 break;
144 /*
145 * doesn't work... S20_3LE != kirkwood 20bit format ?
146 *
147 case SNDRV_PCM_FORMAT_S20_3LE:
148 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
149 value |= KIRKWOOD_PLAYCTL_SIZE_20;
150 break;
151 */
152 case SNDRV_PCM_FORMAT_S24_LE:
153 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
154 value |= KIRKWOOD_PLAYCTL_SIZE_24;
155 break;
156 case SNDRV_PCM_FORMAT_S32_LE:
157 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
158 value |= KIRKWOOD_PLAYCTL_SIZE_32;
159 break;
160 default:
161 return -EINVAL;
162 }
163
164 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
165 value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
166 if (params_channels(params) == 1)
167 value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
168 else
169 value |= KIRKWOOD_PLAYCTL_MONO_OFF;
170 }
171
172 writel(i2s_value, priv->io+i2s_reg);
173 writel(value, priv->io+reg);
174
175 return 0;
176 }
177
kirkwood_i2s_play_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)178 static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
179 int cmd, struct snd_soc_dai *dai)
180 {
181 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
182 unsigned long value;
183
184 /*
185 * specs says KIRKWOOD_PLAYCTL must be read 2 times before
186 * changing it. So read 1 time here and 1 later.
187 */
188 value = readl(priv->io + KIRKWOOD_PLAYCTL);
189
190 switch (cmd) {
191 case SNDRV_PCM_TRIGGER_START:
192 /* stop audio, enable interrupts */
193 value = readl(priv->io + KIRKWOOD_PLAYCTL);
194 value |= KIRKWOOD_PLAYCTL_PAUSE;
195 writel(value, priv->io + KIRKWOOD_PLAYCTL);
196
197 value = readl(priv->io + KIRKWOOD_INT_MASK);
198 value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
199 writel(value, priv->io + KIRKWOOD_INT_MASK);
200
201 /* configure audio & enable i2s playback */
202 value = readl(priv->io + KIRKWOOD_PLAYCTL);
203 value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
204 value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
205 | KIRKWOOD_PLAYCTL_SPDIF_EN);
206
207 if (priv->burst == 32)
208 value |= KIRKWOOD_PLAYCTL_BURST_32;
209 else
210 value |= KIRKWOOD_PLAYCTL_BURST_128;
211 value |= KIRKWOOD_PLAYCTL_I2S_EN;
212 writel(value, priv->io + KIRKWOOD_PLAYCTL);
213 break;
214
215 case SNDRV_PCM_TRIGGER_STOP:
216 /* stop audio, disable interrupts */
217 value = readl(priv->io + KIRKWOOD_PLAYCTL);
218 value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
219 writel(value, priv->io + KIRKWOOD_PLAYCTL);
220
221 value = readl(priv->io + KIRKWOOD_INT_MASK);
222 value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
223 writel(value, priv->io + KIRKWOOD_INT_MASK);
224
225 /* disable all playbacks */
226 value = readl(priv->io + KIRKWOOD_PLAYCTL);
227 value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
228 writel(value, priv->io + KIRKWOOD_PLAYCTL);
229 break;
230
231 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232 case SNDRV_PCM_TRIGGER_SUSPEND:
233 value = readl(priv->io + KIRKWOOD_PLAYCTL);
234 value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
235 writel(value, priv->io + KIRKWOOD_PLAYCTL);
236 break;
237
238 case SNDRV_PCM_TRIGGER_RESUME:
239 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
240 value = readl(priv->io + KIRKWOOD_PLAYCTL);
241 value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
242 writel(value, priv->io + KIRKWOOD_PLAYCTL);
243 break;
244
245 default:
246 return -EINVAL;
247 }
248
249 return 0;
250 }
251
kirkwood_i2s_rec_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)252 static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
253 int cmd, struct snd_soc_dai *dai)
254 {
255 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
256 unsigned long value;
257
258 value = readl(priv->io + KIRKWOOD_RECCTL);
259
260 switch (cmd) {
261 case SNDRV_PCM_TRIGGER_START:
262 /* stop audio, enable interrupts */
263 value = readl(priv->io + KIRKWOOD_RECCTL);
264 value |= KIRKWOOD_RECCTL_PAUSE;
265 writel(value, priv->io + KIRKWOOD_RECCTL);
266
267 value = readl(priv->io + KIRKWOOD_INT_MASK);
268 value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
269 writel(value, priv->io + KIRKWOOD_INT_MASK);
270
271 /* configure audio & enable i2s record */
272 value = readl(priv->io + KIRKWOOD_RECCTL);
273 value &= ~KIRKWOOD_RECCTL_BURST_MASK;
274 value &= ~KIRKWOOD_RECCTL_MONO;
275 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
276 | KIRKWOOD_RECCTL_SPDIF_EN);
277
278 if (priv->burst == 32)
279 value |= KIRKWOOD_RECCTL_BURST_32;
280 else
281 value |= KIRKWOOD_RECCTL_BURST_128;
282 value |= KIRKWOOD_RECCTL_I2S_EN;
283
284 writel(value, priv->io + KIRKWOOD_RECCTL);
285 break;
286
287 case SNDRV_PCM_TRIGGER_STOP:
288 /* stop audio, disable interrupts */
289 value = readl(priv->io + KIRKWOOD_RECCTL);
290 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
291 writel(value, priv->io + KIRKWOOD_RECCTL);
292
293 value = readl(priv->io + KIRKWOOD_INT_MASK);
294 value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
295 writel(value, priv->io + KIRKWOOD_INT_MASK);
296
297 /* disable all records */
298 value = readl(priv->io + KIRKWOOD_RECCTL);
299 value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
300 writel(value, priv->io + KIRKWOOD_RECCTL);
301 break;
302
303 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
304 case SNDRV_PCM_TRIGGER_SUSPEND:
305 value = readl(priv->io + KIRKWOOD_RECCTL);
306 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
307 writel(value, priv->io + KIRKWOOD_RECCTL);
308 break;
309
310 case SNDRV_PCM_TRIGGER_RESUME:
311 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
312 value = readl(priv->io + KIRKWOOD_RECCTL);
313 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
314 writel(value, priv->io + KIRKWOOD_RECCTL);
315 break;
316
317 default:
318 return -EINVAL;
319 }
320
321 return 0;
322 }
323
kirkwood_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)324 static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
325 struct snd_soc_dai *dai)
326 {
327 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
328 return kirkwood_i2s_play_trigger(substream, cmd, dai);
329 else
330 return kirkwood_i2s_rec_trigger(substream, cmd, dai);
331
332 return 0;
333 }
334
kirkwood_i2s_probe(struct snd_soc_dai * dai)335 static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
336 {
337 struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
338 unsigned long value;
339 unsigned int reg_data;
340
341 /* put system in a "safe" state : */
342 /* disable audio interrupts */
343 writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
344 writel(0, priv->io + KIRKWOOD_INT_MASK);
345
346 reg_data = readl(priv->io + 0x1200);
347 reg_data &= (~(0x333FF8));
348 reg_data |= 0x111D18;
349 writel(reg_data, priv->io + 0x1200);
350
351 msleep(500);
352
353 reg_data = readl(priv->io + 0x1200);
354 reg_data &= (~(0x333FF8));
355 reg_data |= 0x111D18;
356 writel(reg_data, priv->io + 0x1200);
357
358 /* disable playback/record */
359 value = readl(priv->io + KIRKWOOD_PLAYCTL);
360 value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
361 writel(value, priv->io + KIRKWOOD_PLAYCTL);
362
363 value = readl(priv->io + KIRKWOOD_RECCTL);
364 value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
365 writel(value, priv->io + KIRKWOOD_RECCTL);
366
367 return 0;
368
369 }
370
kirkwood_i2s_remove(struct snd_soc_dai * dai)371 static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
372 {
373 return 0;
374 }
375
376 static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
377 .startup = kirkwood_i2s_startup,
378 .trigger = kirkwood_i2s_trigger,
379 .hw_params = kirkwood_i2s_hw_params,
380 .set_fmt = kirkwood_i2s_set_fmt,
381 };
382
383
384 static struct snd_soc_dai_driver kirkwood_i2s_dai = {
385 .probe = kirkwood_i2s_probe,
386 .remove = kirkwood_i2s_remove,
387 .playback = {
388 .channels_min = 1,
389 .channels_max = 2,
390 .rates = KIRKWOOD_I2S_RATES,
391 .formats = KIRKWOOD_I2S_FORMATS,},
392 .capture = {
393 .channels_min = 1,
394 .channels_max = 2,
395 .rates = KIRKWOOD_I2S_RATES,
396 .formats = KIRKWOOD_I2S_FORMATS,},
397 .ops = &kirkwood_i2s_dai_ops,
398 };
399
kirkwood_i2s_dev_probe(struct platform_device * pdev)400 static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
401 {
402 struct resource *mem;
403 struct kirkwood_asoc_platform_data *data =
404 pdev->dev.platform_data;
405 struct kirkwood_dma_data *priv;
406 int err;
407
408 priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
409 if (!priv) {
410 dev_err(&pdev->dev, "allocation failed\n");
411 err = -ENOMEM;
412 goto error;
413 }
414 dev_set_drvdata(&pdev->dev, priv);
415
416 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
417 if (!mem) {
418 dev_err(&pdev->dev, "platform_get_resource failed\n");
419 err = -ENXIO;
420 goto err_alloc;
421 }
422
423 priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
424 if (!priv->mem) {
425 dev_err(&pdev->dev, "request_mem_region failed\n");
426 err = -EBUSY;
427 goto err_alloc;
428 }
429
430 priv->io = ioremap(priv->mem->start, SZ_16K);
431 if (!priv->io) {
432 dev_err(&pdev->dev, "ioremap failed\n");
433 err = -ENOMEM;
434 goto err_iomem;
435 }
436
437 priv->irq = platform_get_irq(pdev, 0);
438 if (priv->irq <= 0) {
439 dev_err(&pdev->dev, "platform_get_irq failed\n");
440 err = -ENXIO;
441 goto err_ioremap;
442 }
443
444 if (!data) {
445 dev_err(&pdev->dev, "no platform data ?!\n");
446 err = -EINVAL;
447 goto err_ioremap;
448 }
449
450 priv->burst = data->burst;
451
452 return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
453
454 err_ioremap:
455 iounmap(priv->io);
456 err_iomem:
457 release_mem_region(priv->mem->start, SZ_16K);
458 err_alloc:
459 kfree(priv);
460 error:
461 return err;
462 }
463
kirkwood_i2s_dev_remove(struct platform_device * pdev)464 static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
465 {
466 struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
467
468 snd_soc_unregister_dai(&pdev->dev);
469 iounmap(priv->io);
470 release_mem_region(priv->mem->start, SZ_16K);
471 kfree(priv);
472
473 return 0;
474 }
475
476 static struct platform_driver kirkwood_i2s_driver = {
477 .probe = kirkwood_i2s_dev_probe,
478 .remove = __devexit_p(kirkwood_i2s_dev_remove),
479 .driver = {
480 .name = DRV_NAME,
481 .owner = THIS_MODULE,
482 },
483 };
484
485 module_platform_driver(kirkwood_i2s_driver);
486
487 /* Module information */
488 MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
489 MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
490 MODULE_LICENSE("GPL");
491 MODULE_ALIAS("platform:kirkwood-i2s");
492