2 * Au12x0/Au1550 PSC ALSA ASoC audio support.
4 * (c) 2007-2009 MSC Vertriebsges.m.b.H.,
5 * Manuel Lauss <manuel.lauss@gmail.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Au1xxx-PSC AC97 glue.
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/device.h>
19 #include <linux/delay.h>
20 #include <linux/mutex.h>
21 #include <linux/suspend.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/initval.h>
25 #include <sound/soc.h>
26 #include <asm/mach-au1x00/au1000.h>
27 #include <asm/mach-au1x00/au1xxx_psc.h>
31 /* how often to retry failed codec register reads/writes */
32 #define AC97_RW_RETRIES 5
35 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
38 SNDRV_PCM_RATE_8000_48000
41 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
43 #define AC97PCR_START(stype) \
44 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
45 #define AC97PCR_STOP(stype) \
46 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
47 #define AC97PCR_CLRFIFO(stype) \
48 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
50 #define AC97STAT_BUSY(stype) \
51 ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
53 /* instance data. There can be only one, MacLeod!!!! */
54 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
58 /* this could theoretically work, but ac97->bus->card->private_data can be NULL
59 * when snd_ac97_mixer() is called; I don't know if the rest further down the
60 * chain are always valid either.
62 static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
64 struct snd_soc_card *c = x->bus->card->private_data;
65 return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
70 #define ac97_to_pscdata(x) au1xpsc_ac97_workdata
74 /* AC97 controller reads codec register */
75 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
78 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
79 unsigned short retry, tmo;
82 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
85 retry = AC97_RW_RETRIES;
87 mutex_lock(&pscdata->lock);
89 au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
96 if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
100 data = au_readl(AC97_CDC(pscdata));
102 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
105 mutex_unlock(&pscdata->lock);
107 if (reg != ((data >> 16) & 0x7f))
108 tmo = 1; /* wrong register, try again */
110 } while (--retry && !tmo);
112 return retry ? data & 0xffff : 0xffff;
115 /* AC97 controller writes to codec register */
116 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
119 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
120 unsigned int tmo, retry;
122 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
125 retry = AC97_RW_RETRIES;
127 mutex_lock(&pscdata->lock);
129 au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
136 if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
140 au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
143 mutex_unlock(&pscdata->lock);
144 } while (--retry && !tmo);
147 /* AC97 controller asserts a warm reset */
148 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
150 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
152 au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
155 au_writel(0, AC97_RST(pscdata));
159 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
161 struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
164 /* disable PSC during cold reset */
165 au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
167 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
170 /* issue cold reset */
171 au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
174 au_writel(0, AC97_RST(pscdata));
178 au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
181 /* wait for PSC to indicate it's ready */
183 while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
187 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
191 /* enable the ac97 function */
192 au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
195 /* wait for AC97 core to become ready */
197 while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
200 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
203 /* AC97 controller operations */
204 struct snd_ac97_bus_ops soc_ac97_ops = {
205 .read = au1xpsc_ac97_read,
206 .write = au1xpsc_ac97_write,
207 .reset = au1xpsc_ac97_cold_reset,
208 .warm_reset = au1xpsc_ac97_warm_reset,
210 EXPORT_SYMBOL_GPL(soc_ac97_ops);
212 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
213 struct snd_pcm_hw_params *params,
214 struct snd_soc_dai *dai)
216 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
217 unsigned long r, ro, stat;
218 int chans, t, stype = substream->stream;
220 chans = params_channels(params);
222 r = ro = au_readl(AC97_CFG(pscdata));
223 stat = au_readl(AC97_STAT(pscdata));
225 /* already active? */
226 if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
227 /* reject parameters not currently set up */
228 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
229 (pscdata->rate != params_rate(params)))
233 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
234 r &= ~PSC_AC97CFG_LEN_MASK;
235 r |= PSC_AC97CFG_SET_LEN(params->msbits);
237 /* channels: enable slots for front L/R channel */
238 if (stype == SNDRV_PCM_STREAM_PLAYBACK) {
239 r &= ~PSC_AC97CFG_TXSLOT_MASK;
240 r |= PSC_AC97CFG_TXSLOT_ENA(3);
241 r |= PSC_AC97CFG_TXSLOT_ENA(4);
243 r &= ~PSC_AC97CFG_RXSLOT_MASK;
244 r |= PSC_AC97CFG_RXSLOT_ENA(3);
245 r |= PSC_AC97CFG_RXSLOT_ENA(4);
248 /* do we need to poke the hardware? */
252 /* ac97 engine is about to be disabled */
253 mutex_lock(&pscdata->lock);
255 /* disable AC97 device controller first... */
256 au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
259 /* ...wait for it... */
261 while ((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
265 printk(KERN_ERR "PSC-AC97: can't disable!\n");
267 /* ...write config... */
268 au_writel(r, AC97_CFG(pscdata));
271 /* ...enable the AC97 controller again... */
272 au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
275 /* ...and wait for ready bit */
277 while ((!(au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
281 printk(KERN_ERR "PSC-AC97: can't enable!\n");
283 mutex_unlock(&pscdata->lock);
286 pscdata->rate = params_rate(params);
293 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
294 int cmd, struct snd_soc_dai *dai)
296 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
297 int ret, stype = substream->stream;
302 case SNDRV_PCM_TRIGGER_START:
303 case SNDRV_PCM_TRIGGER_RESUME:
304 au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
306 au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
309 case SNDRV_PCM_TRIGGER_STOP:
310 case SNDRV_PCM_TRIGGER_SUSPEND:
311 au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
314 while (au_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
315 asm volatile ("nop");
317 au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
327 static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream,
328 struct snd_soc_dai *dai)
330 struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
331 snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
335 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
337 return au1xpsc_ac97_workdata ? 0 : -ENODEV;
340 static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
341 .startup = au1xpsc_ac97_startup,
342 .trigger = au1xpsc_ac97_trigger,
343 .hw_params = au1xpsc_ac97_hw_params,
346 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
348 .probe = au1xpsc_ac97_probe,
351 .formats = AC97_FMTS,
357 .formats = AC97_FMTS,
361 .ops = &au1xpsc_ac97_dai_ops,
364 static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
367 struct resource *iores, *dmares;
369 struct au1xpsc_audio_data *wd;
371 wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
375 mutex_init(&wd->lock);
377 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
384 if (!request_mem_region(iores->start, resource_size(iores),
388 wd->mmio = ioremap(iores->start, resource_size(iores));
392 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
395 wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
397 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
400 wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
402 /* configuration: max dma trigger threshold, enable ac97 */
403 wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
404 PSC_AC97CFG_DE_ENABLE;
406 /* preserve PSC clock source set up by platform */
407 sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
408 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
410 au_writel(0, PSC_SEL(wd));
412 au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
415 /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
416 memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
417 sizeof(struct snd_soc_dai_driver));
418 wd->dai_drv.name = dev_name(&pdev->dev);
420 platform_set_drvdata(pdev, wd);
422 ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
426 au1xpsc_ac97_workdata = wd;
432 release_mem_region(iores->start, resource_size(iores));
438 static int __devexit au1xpsc_ac97_drvremove(struct platform_device *pdev)
440 struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
441 struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
443 snd_soc_unregister_dai(&pdev->dev);
445 /* disable PSC completely */
446 au_writel(0, AC97_CFG(wd));
448 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
452 release_mem_region(r->start, resource_size(r));
455 au1xpsc_ac97_workdata = NULL; /* MDEV */
461 static int au1xpsc_ac97_drvsuspend(struct device *dev)
463 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
465 /* save interesting registers and disable PSC */
466 wd->pm[0] = au_readl(PSC_SEL(wd));
468 au_writel(0, AC97_CFG(wd));
470 au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
476 static int au1xpsc_ac97_drvresume(struct device *dev)
478 struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
480 /* restore PSC clock config */
481 au_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
484 /* after this point the ac97 core will cold-reset the codec.
485 * During cold-reset the PSC is reinitialized and the last
486 * configuration set up in hw_params() is restored.
491 static struct dev_pm_ops au1xpscac97_pmops = {
492 .suspend = au1xpsc_ac97_drvsuspend,
493 .resume = au1xpsc_ac97_drvresume,
496 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
500 #define AU1XPSCAC97_PMOPS NULL
504 static struct platform_driver au1xpsc_ac97_driver = {
506 .name = "au1xpsc_ac97",
507 .owner = THIS_MODULE,
508 .pm = AU1XPSCAC97_PMOPS,
510 .probe = au1xpsc_ac97_drvprobe,
511 .remove = __devexit_p(au1xpsc_ac97_drvremove),
514 static int __init au1xpsc_ac97_load(void)
516 au1xpsc_ac97_workdata = NULL;
517 return platform_driver_register(&au1xpsc_ac97_driver);
520 static void __exit au1xpsc_ac97_unload(void)
522 platform_driver_unregister(&au1xpsc_ac97_driver);
525 module_init(au1xpsc_ac97_load);
526 module_exit(au1xpsc_ac97_unload);
528 MODULE_LICENSE("GPL");
529 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
530 MODULE_AUTHOR("Manuel Lauss");