1 /* sound/soc/samsung/ac97.c
2 *
3 * ALSA SoC Audio Layer - S3C AC97 Controller driver
4 * Evolved from s3c2443-ac97.c
5 *
6 * Copyright (c) 2010 Samsung Electronics Co. Ltd
7 * Author: Jaswinder Singh <jassisinghbrar@gmail.com>
8 * Credits: Graeme Gregory, Sean Choi
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/io.h>
16 #include <linux/delay.h>
17 #include <linux/clk.h>
18 #include <linux/module.h>
19
20 #include <sound/soc.h>
21
22 #include <mach/dma.h>
23 #include "regs-ac97.h"
24 #include <linux/platform_data/asoc-s3c.h>
25
26 #include "dma.h"
27
28 #define AC_CMD_ADDR(x) (x << 16)
29 #define AC_CMD_DATA(x) (x & 0xffff)
30
31 #define S3C_AC97_DAI_PCM 0
32 #define S3C_AC97_DAI_MIC 1
33
34 struct s3c_ac97_info {
35 struct clk *ac97_clk;
36 void __iomem *regs;
37 struct mutex lock;
38 struct completion done;
39 };
40 static struct s3c_ac97_info s3c_ac97;
41
42 static struct s3c2410_dma_client s3c_dma_client_out = {
43 .name = "AC97 PCMOut"
44 };
45
46 static struct s3c2410_dma_client s3c_dma_client_in = {
47 .name = "AC97 PCMIn"
48 };
49
50 static struct s3c2410_dma_client s3c_dma_client_micin = {
51 .name = "AC97 MicIn"
52 };
53
54 static struct s3c_dma_params s3c_ac97_pcm_out = {
55 .client = &s3c_dma_client_out,
56 .dma_size = 4,
57 };
58
59 static struct s3c_dma_params s3c_ac97_pcm_in = {
60 .client = &s3c_dma_client_in,
61 .dma_size = 4,
62 };
63
64 static struct s3c_dma_params s3c_ac97_mic_in = {
65 .client = &s3c_dma_client_micin,
66 .dma_size = 4,
67 };
68
s3c_ac97_activate(struct snd_ac97 * ac97)69 static void s3c_ac97_activate(struct snd_ac97 *ac97)
70 {
71 u32 ac_glbctrl, stat;
72
73 stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
74 if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
75 return; /* Return if already active */
76
77 INIT_COMPLETION(s3c_ac97.done);
78
79 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
80 ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
81 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
82 msleep(1);
83
84 ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
85 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
86 msleep(1);
87
88 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
89 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
90 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
91
92 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
93 pr_err("AC97: Unable to activate!");
94 }
95
s3c_ac97_read(struct snd_ac97 * ac97,unsigned short reg)96 static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
97 unsigned short reg)
98 {
99 u32 ac_glbctrl, ac_codec_cmd;
100 u32 stat, addr, data;
101
102 mutex_lock(&s3c_ac97.lock);
103
104 s3c_ac97_activate(ac97);
105
106 INIT_COMPLETION(s3c_ac97.done);
107
108 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
109 ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
110 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
111
112 udelay(50);
113
114 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
115 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
116 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
117
118 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
119 pr_err("AC97: Unable to read!");
120
121 stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
122 addr = (stat >> 16) & 0x7f;
123 data = (stat & 0xffff);
124
125 if (addr != reg)
126 pr_err("ac97: req addr = %02x, rep addr = %02x\n",
127 reg, addr);
128
129 mutex_unlock(&s3c_ac97.lock);
130
131 return (unsigned short)data;
132 }
133
s3c_ac97_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)134 static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
135 unsigned short val)
136 {
137 u32 ac_glbctrl, ac_codec_cmd;
138
139 mutex_lock(&s3c_ac97.lock);
140
141 s3c_ac97_activate(ac97);
142
143 INIT_COMPLETION(s3c_ac97.done);
144
145 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
146 ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
147 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
148
149 udelay(50);
150
151 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
152 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
153 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
154
155 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
156 pr_err("AC97: Unable to write!");
157
158 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
159 ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
160 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
161
162 mutex_unlock(&s3c_ac97.lock);
163 }
164
s3c_ac97_cold_reset(struct snd_ac97 * ac97)165 static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
166 {
167 pr_debug("AC97: Cold reset\n");
168 writel(S3C_AC97_GLBCTRL_COLDRESET,
169 s3c_ac97.regs + S3C_AC97_GLBCTRL);
170 msleep(1);
171
172 writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
173 msleep(1);
174 }
175
s3c_ac97_warm_reset(struct snd_ac97 * ac97)176 static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
177 {
178 u32 stat;
179
180 stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
181 if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
182 return; /* Return if already active */
183
184 pr_debug("AC97: Warm reset\n");
185
186 writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
187 msleep(1);
188
189 writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
190 msleep(1);
191
192 s3c_ac97_activate(ac97);
193 }
194
s3c_ac97_irq(int irq,void * dev_id)195 static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
196 {
197 u32 ac_glbctrl, ac_glbstat;
198
199 ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
200
201 if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
202
203 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
204 ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
205 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
206
207 complete(&s3c_ac97.done);
208 }
209
210 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
211 ac_glbctrl |= (1<<30); /* Clear interrupt */
212 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
213
214 return IRQ_HANDLED;
215 }
216
217 struct snd_ac97_bus_ops soc_ac97_ops = {
218 .read = s3c_ac97_read,
219 .write = s3c_ac97_write,
220 .warm_reset = s3c_ac97_warm_reset,
221 .reset = s3c_ac97_cold_reset,
222 };
223 EXPORT_SYMBOL_GPL(soc_ac97_ops);
224
s3c_ac97_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)225 static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
226 struct snd_pcm_hw_params *params,
227 struct snd_soc_dai *dai)
228 {
229 struct snd_soc_pcm_runtime *rtd = substream->private_data;
230 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
231 struct s3c_dma_params *dma_data;
232
233 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
234 dma_data = &s3c_ac97_pcm_out;
235 else
236 dma_data = &s3c_ac97_pcm_in;
237
238 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
239
240 return 0;
241 }
242
s3c_ac97_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)243 static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
244 struct snd_soc_dai *dai)
245 {
246 u32 ac_glbctrl;
247 struct snd_soc_pcm_runtime *rtd = substream->private_data;
248 struct s3c_dma_params *dma_data =
249 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
250
251 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
252 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
253 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
254 else
255 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
256
257 switch (cmd) {
258 case SNDRV_PCM_TRIGGER_START:
259 case SNDRV_PCM_TRIGGER_RESUME:
260 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
261 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
262 ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
263 else
264 ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
265 break;
266
267 case SNDRV_PCM_TRIGGER_STOP:
268 case SNDRV_PCM_TRIGGER_SUSPEND:
269 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
270 break;
271 }
272
273 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
274
275 if (!dma_data->ops)
276 dma_data->ops = samsung_dma_get_ops();
277
278 dma_data->ops->started(dma_data->channel);
279
280 return 0;
281 }
282
s3c_ac97_hw_mic_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)283 static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
284 struct snd_pcm_hw_params *params,
285 struct snd_soc_dai *dai)
286 {
287 struct snd_soc_pcm_runtime *rtd = substream->private_data;
288 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
289
290 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
291 return -ENODEV;
292 else
293 snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);
294
295 return 0;
296 }
297
s3c_ac97_mic_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)298 static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
299 int cmd, struct snd_soc_dai *dai)
300 {
301 u32 ac_glbctrl;
302 struct snd_soc_pcm_runtime *rtd = substream->private_data;
303 struct s3c_dma_params *dma_data =
304 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
305
306 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
307 ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
308
309 switch (cmd) {
310 case SNDRV_PCM_TRIGGER_START:
311 case SNDRV_PCM_TRIGGER_RESUME:
312 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
313 ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
314 break;
315
316 case SNDRV_PCM_TRIGGER_STOP:
317 case SNDRV_PCM_TRIGGER_SUSPEND:
318 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
319 break;
320 }
321
322 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
323
324 if (!dma_data->ops)
325 dma_data->ops = samsung_dma_get_ops();
326
327 dma_data->ops->started(dma_data->channel);
328
329 return 0;
330 }
331
332 static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
333 .hw_params = s3c_ac97_hw_params,
334 .trigger = s3c_ac97_trigger,
335 };
336
337 static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
338 .hw_params = s3c_ac97_hw_mic_params,
339 .trigger = s3c_ac97_mic_trigger,
340 };
341
342 static struct snd_soc_dai_driver s3c_ac97_dai[] = {
343 [S3C_AC97_DAI_PCM] = {
344 .name = "samsung-ac97",
345 .ac97_control = 1,
346 .playback = {
347 .stream_name = "AC97 Playback",
348 .channels_min = 2,
349 .channels_max = 2,
350 .rates = SNDRV_PCM_RATE_8000_48000,
351 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
352 .capture = {
353 .stream_name = "AC97 Capture",
354 .channels_min = 2,
355 .channels_max = 2,
356 .rates = SNDRV_PCM_RATE_8000_48000,
357 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
358 .ops = &s3c_ac97_dai_ops,
359 },
360 [S3C_AC97_DAI_MIC] = {
361 .name = "samsung-ac97-mic",
362 .ac97_control = 1,
363 .capture = {
364 .stream_name = "AC97 Mic Capture",
365 .channels_min = 1,
366 .channels_max = 1,
367 .rates = SNDRV_PCM_RATE_8000_48000,
368 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
369 .ops = &s3c_ac97_mic_dai_ops,
370 },
371 };
372
373 static const struct snd_soc_component_driver s3c_ac97_component = {
374 .name = "s3c-ac97",
375 };
376
s3c_ac97_probe(struct platform_device * pdev)377 static int s3c_ac97_probe(struct platform_device *pdev)
378 {
379 struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
380 struct s3c_audio_pdata *ac97_pdata;
381 int ret;
382
383 ac97_pdata = pdev->dev.platform_data;
384 if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
385 dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
386 return -EINVAL;
387 }
388
389 /* Check for availability of necessary resource */
390 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
391 if (!dmatx_res) {
392 dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
393 return -ENXIO;
394 }
395
396 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
397 if (!dmarx_res) {
398 dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
399 return -ENXIO;
400 }
401
402 dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
403 if (!dmamic_res) {
404 dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
405 return -ENXIO;
406 }
407
408 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
409 if (!mem_res) {
410 dev_err(&pdev->dev, "Unable to get register resource\n");
411 return -ENXIO;
412 }
413
414 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
415 if (!irq_res) {
416 dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
417 return -ENXIO;
418 }
419
420 if (!request_mem_region(mem_res->start,
421 resource_size(mem_res), "ac97")) {
422 dev_err(&pdev->dev, "Unable to request register region\n");
423 return -EBUSY;
424 }
425
426 s3c_ac97_pcm_out.channel = dmatx_res->start;
427 s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
428 s3c_ac97_pcm_in.channel = dmarx_res->start;
429 s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
430 s3c_ac97_mic_in.channel = dmamic_res->start;
431 s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
432
433 init_completion(&s3c_ac97.done);
434 mutex_init(&s3c_ac97.lock);
435
436 s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
437 if (s3c_ac97.regs == NULL) {
438 dev_err(&pdev->dev, "Unable to ioremap register region\n");
439 ret = -ENXIO;
440 goto err1;
441 }
442
443 s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
444 if (IS_ERR(s3c_ac97.ac97_clk)) {
445 dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
446 ret = -ENODEV;
447 goto err2;
448 }
449 clk_prepare_enable(s3c_ac97.ac97_clk);
450
451 if (ac97_pdata->cfg_gpio(pdev)) {
452 dev_err(&pdev->dev, "Unable to configure gpio\n");
453 ret = -EINVAL;
454 goto err3;
455 }
456
457 ret = request_irq(irq_res->start, s3c_ac97_irq,
458 0, "AC97", NULL);
459 if (ret < 0) {
460 dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
461 goto err4;
462 }
463
464 ret = snd_soc_register_component(&pdev->dev, &s3c_ac97_component,
465 s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
466 if (ret)
467 goto err5;
468
469 ret = asoc_dma_platform_register(&pdev->dev);
470 if (ret) {
471 dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
472 goto err6;
473 }
474
475 return 0;
476 err6:
477 snd_soc_unregister_component(&pdev->dev);
478 err5:
479 free_irq(irq_res->start, NULL);
480 err4:
481 err3:
482 clk_disable_unprepare(s3c_ac97.ac97_clk);
483 clk_put(s3c_ac97.ac97_clk);
484 err2:
485 iounmap(s3c_ac97.regs);
486 err1:
487 release_mem_region(mem_res->start, resource_size(mem_res));
488
489 return ret;
490 }
491
s3c_ac97_remove(struct platform_device * pdev)492 static int s3c_ac97_remove(struct platform_device *pdev)
493 {
494 struct resource *mem_res, *irq_res;
495
496 asoc_dma_platform_unregister(&pdev->dev);
497 snd_soc_unregister_component(&pdev->dev);
498
499 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
500 if (irq_res)
501 free_irq(irq_res->start, NULL);
502
503 clk_disable_unprepare(s3c_ac97.ac97_clk);
504 clk_put(s3c_ac97.ac97_clk);
505
506 iounmap(s3c_ac97.regs);
507
508 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
509 if (mem_res)
510 release_mem_region(mem_res->start, resource_size(mem_res));
511
512 return 0;
513 }
514
515 static struct platform_driver s3c_ac97_driver = {
516 .probe = s3c_ac97_probe,
517 .remove = s3c_ac97_remove,
518 .driver = {
519 .name = "samsung-ac97",
520 .owner = THIS_MODULE,
521 },
522 };
523
524 module_platform_driver(s3c_ac97_driver);
525
526 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
527 MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
528 MODULE_LICENSE("GPL");
529 MODULE_ALIAS("platform:samsung-ac97");
530