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 "regs-ac97.h"
23 #include <linux/platform_data/asoc-s3c.h>
24
25 #include "dma.h"
26
27 #define AC_CMD_ADDR(x) (x << 16)
28 #define AC_CMD_DATA(x) (x & 0xffff)
29
30 #define S3C_AC97_DAI_PCM 0
31 #define S3C_AC97_DAI_MIC 1
32
33 struct s3c_ac97_info {
34 struct clk *ac97_clk;
35 void __iomem *regs;
36 struct mutex lock;
37 struct completion done;
38 };
39 static struct s3c_ac97_info s3c_ac97;
40
41 static struct s3c_dma_params s3c_ac97_pcm_out = {
42 .dma_size = 4,
43 };
44
45 static struct s3c_dma_params s3c_ac97_pcm_in = {
46 .dma_size = 4,
47 };
48
49 static struct s3c_dma_params s3c_ac97_mic_in = {
50 .dma_size = 4,
51 };
52
s3c_ac97_activate(struct snd_ac97 * ac97)53 static void s3c_ac97_activate(struct snd_ac97 *ac97)
54 {
55 u32 ac_glbctrl, stat;
56
57 stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
58 if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
59 return; /* Return if already active */
60
61 reinit_completion(&s3c_ac97.done);
62
63 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
64 ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
65 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
66 msleep(1);
67
68 ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
69 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
70 msleep(1);
71
72 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
73 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
74 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
75
76 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
77 pr_err("AC97: Unable to activate!");
78 }
79
s3c_ac97_read(struct snd_ac97 * ac97,unsigned short reg)80 static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
81 unsigned short reg)
82 {
83 u32 ac_glbctrl, ac_codec_cmd;
84 u32 stat, addr, data;
85
86 mutex_lock(&s3c_ac97.lock);
87
88 s3c_ac97_activate(ac97);
89
90 reinit_completion(&s3c_ac97.done);
91
92 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
93 ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
94 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
95
96 udelay(50);
97
98 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
99 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
100 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
101
102 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
103 pr_err("AC97: Unable to read!");
104
105 stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
106 addr = (stat >> 16) & 0x7f;
107 data = (stat & 0xffff);
108
109 if (addr != reg)
110 pr_err("ac97: req addr = %02x, rep addr = %02x\n",
111 reg, addr);
112
113 mutex_unlock(&s3c_ac97.lock);
114
115 return (unsigned short)data;
116 }
117
s3c_ac97_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)118 static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
119 unsigned short val)
120 {
121 u32 ac_glbctrl, ac_codec_cmd;
122
123 mutex_lock(&s3c_ac97.lock);
124
125 s3c_ac97_activate(ac97);
126
127 reinit_completion(&s3c_ac97.done);
128
129 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
130 ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
131 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
132
133 udelay(50);
134
135 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
136 ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
137 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
138
139 if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
140 pr_err("AC97: Unable to write!");
141
142 ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
143 ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
144 writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
145
146 mutex_unlock(&s3c_ac97.lock);
147 }
148
s3c_ac97_cold_reset(struct snd_ac97 * ac97)149 static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
150 {
151 pr_debug("AC97: Cold reset\n");
152 writel(S3C_AC97_GLBCTRL_COLDRESET,
153 s3c_ac97.regs + S3C_AC97_GLBCTRL);
154 msleep(1);
155
156 writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
157 msleep(1);
158 }
159
s3c_ac97_warm_reset(struct snd_ac97 * ac97)160 static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
161 {
162 u32 stat;
163
164 stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
165 if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
166 return; /* Return if already active */
167
168 pr_debug("AC97: Warm reset\n");
169
170 writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
171 msleep(1);
172
173 writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
174 msleep(1);
175
176 s3c_ac97_activate(ac97);
177 }
178
s3c_ac97_irq(int irq,void * dev_id)179 static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
180 {
181 u32 ac_glbctrl, ac_glbstat;
182
183 ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
184
185 if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
186
187 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
188 ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
189 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
190
191 complete(&s3c_ac97.done);
192 }
193
194 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
195 ac_glbctrl |= (1<<30); /* Clear interrupt */
196 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
197
198 return IRQ_HANDLED;
199 }
200
201 static struct snd_ac97_bus_ops s3c_ac97_ops = {
202 .read = s3c_ac97_read,
203 .write = s3c_ac97_write,
204 .warm_reset = s3c_ac97_warm_reset,
205 .reset = s3c_ac97_cold_reset,
206 };
207
s3c_ac97_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)208 static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
209 struct snd_soc_dai *dai)
210 {
211 u32 ac_glbctrl;
212
213 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
214 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
215 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
216 else
217 ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
218
219 switch (cmd) {
220 case SNDRV_PCM_TRIGGER_START:
221 case SNDRV_PCM_TRIGGER_RESUME:
222 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
223 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
224 ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
225 else
226 ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
227 break;
228
229 case SNDRV_PCM_TRIGGER_STOP:
230 case SNDRV_PCM_TRIGGER_SUSPEND:
231 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232 break;
233 }
234
235 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
236
237 return 0;
238 }
239
s3c_ac97_mic_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)240 static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
241 int cmd, struct snd_soc_dai *dai)
242 {
243 u32 ac_glbctrl;
244
245 ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
246 ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
247
248 switch (cmd) {
249 case SNDRV_PCM_TRIGGER_START:
250 case SNDRV_PCM_TRIGGER_RESUME:
251 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
252 ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
253 break;
254
255 case SNDRV_PCM_TRIGGER_STOP:
256 case SNDRV_PCM_TRIGGER_SUSPEND:
257 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
258 break;
259 }
260
261 writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
262
263 return 0;
264 }
265
266 static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
267 .trigger = s3c_ac97_trigger,
268 };
269
270 static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
271 .trigger = s3c_ac97_mic_trigger,
272 };
273
s3c_ac97_dai_probe(struct snd_soc_dai * dai)274 static int s3c_ac97_dai_probe(struct snd_soc_dai *dai)
275 {
276 samsung_asoc_init_dma_data(dai, &s3c_ac97_pcm_out, &s3c_ac97_pcm_in);
277
278 return 0;
279 }
280
s3c_ac97_mic_dai_probe(struct snd_soc_dai * dai)281 static int s3c_ac97_mic_dai_probe(struct snd_soc_dai *dai)
282 {
283 samsung_asoc_init_dma_data(dai, NULL, &s3c_ac97_mic_in);
284
285 return 0;
286 }
287
288 static struct snd_soc_dai_driver s3c_ac97_dai[] = {
289 [S3C_AC97_DAI_PCM] = {
290 .name = "samsung-ac97",
291 .ac97_control = 1,
292 .playback = {
293 .stream_name = "AC97 Playback",
294 .channels_min = 2,
295 .channels_max = 2,
296 .rates = SNDRV_PCM_RATE_8000_48000,
297 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
298 .capture = {
299 .stream_name = "AC97 Capture",
300 .channels_min = 2,
301 .channels_max = 2,
302 .rates = SNDRV_PCM_RATE_8000_48000,
303 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
304 .probe = s3c_ac97_dai_probe,
305 .ops = &s3c_ac97_dai_ops,
306 },
307 [S3C_AC97_DAI_MIC] = {
308 .name = "samsung-ac97-mic",
309 .ac97_control = 1,
310 .capture = {
311 .stream_name = "AC97 Mic Capture",
312 .channels_min = 1,
313 .channels_max = 1,
314 .rates = SNDRV_PCM_RATE_8000_48000,
315 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
316 .probe = s3c_ac97_mic_dai_probe,
317 .ops = &s3c_ac97_mic_dai_ops,
318 },
319 };
320
321 static const struct snd_soc_component_driver s3c_ac97_component = {
322 .name = "s3c-ac97",
323 };
324
s3c_ac97_probe(struct platform_device * pdev)325 static int s3c_ac97_probe(struct platform_device *pdev)
326 {
327 struct resource *mem_res, *irq_res;
328 struct s3c_audio_pdata *ac97_pdata;
329 int ret;
330
331 ac97_pdata = pdev->dev.platform_data;
332 if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
333 dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
334 return -EINVAL;
335 }
336
337 /* Check for availability of necessary resource */
338 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
339 if (!irq_res) {
340 dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
341 return -ENXIO;
342 }
343
344 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
345 s3c_ac97.regs = devm_ioremap_resource(&pdev->dev, mem_res);
346 if (IS_ERR(s3c_ac97.regs))
347 return PTR_ERR(s3c_ac97.regs);
348
349 s3c_ac97_pcm_out.slave = ac97_pdata->dma_playback;
350 s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
351 s3c_ac97_pcm_in.slave = ac97_pdata->dma_capture;
352 s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
353 s3c_ac97_mic_in.slave = ac97_pdata->dma_capture_mic;
354 s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
355
356 init_completion(&s3c_ac97.done);
357 mutex_init(&s3c_ac97.lock);
358
359 s3c_ac97.ac97_clk = devm_clk_get(&pdev->dev, "ac97");
360 if (IS_ERR(s3c_ac97.ac97_clk)) {
361 dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
362 ret = -ENODEV;
363 goto err2;
364 }
365 clk_prepare_enable(s3c_ac97.ac97_clk);
366
367 if (ac97_pdata->cfg_gpio(pdev)) {
368 dev_err(&pdev->dev, "Unable to configure gpio\n");
369 ret = -EINVAL;
370 goto err3;
371 }
372
373 ret = request_irq(irq_res->start, s3c_ac97_irq,
374 0, "AC97", NULL);
375 if (ret < 0) {
376 dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
377 goto err4;
378 }
379
380 ret = snd_soc_set_ac97_ops(&s3c_ac97_ops);
381 if (ret != 0) {
382 dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
383 goto err4;
384 }
385
386 ret = devm_snd_soc_register_component(&pdev->dev, &s3c_ac97_component,
387 s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
388 if (ret)
389 goto err5;
390
391 ret = samsung_asoc_dma_platform_register(&pdev->dev);
392 if (ret) {
393 dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
394 goto err5;
395 }
396
397 return 0;
398 err5:
399 free_irq(irq_res->start, NULL);
400 err4:
401 err3:
402 clk_disable_unprepare(s3c_ac97.ac97_clk);
403 err2:
404 snd_soc_set_ac97_ops(NULL);
405 return ret;
406 }
407
s3c_ac97_remove(struct platform_device * pdev)408 static int s3c_ac97_remove(struct platform_device *pdev)
409 {
410 struct resource *irq_res;
411
412 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
413 if (irq_res)
414 free_irq(irq_res->start, NULL);
415
416 clk_disable_unprepare(s3c_ac97.ac97_clk);
417 snd_soc_set_ac97_ops(NULL);
418
419 return 0;
420 }
421
422 static struct platform_driver s3c_ac97_driver = {
423 .probe = s3c_ac97_probe,
424 .remove = s3c_ac97_remove,
425 .driver = {
426 .name = "samsung-ac97",
427 .owner = THIS_MODULE,
428 },
429 };
430
431 module_platform_driver(s3c_ac97_driver);
432
433 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
434 MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
435 MODULE_LICENSE("GPL");
436 MODULE_ALIAS("platform:samsung-ac97");
437