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Linux/sound/soc/au1x/psc-ac97.c

  1 /*
  2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
  3  *
  4  * (c) 2007-2009 MSC Vertriebsges.m.b.H.,
  5  *      Manuel Lauss <manuel.lauss@gmail.com>
  6  *
  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.
 10  *
 11  * Au1xxx-PSC AC97 glue.
 12  *
 13  */
 14 
 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>
 28 
 29 #include "psc.h"
 30 
 31 /* how often to retry failed codec register reads/writes */
 32 #define AC97_RW_RETRIES 5
 33 
 34 #define AC97_DIR        \
 35         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
 36 
 37 #define AC97_RATES      \
 38         SNDRV_PCM_RATE_8000_48000
 39 
 40 #define AC97_FMTS       \
 41         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
 42 
 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)
 49 
 50 #define AC97STAT_BUSY(stype)    \
 51         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
 52 
 53 /* instance data. There can be only one, MacLeod!!!! */
 54 static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
 55 
 56 #if 0
 57 
 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.
 61  */
 62 static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
 63 {
 64         struct snd_soc_card *c = x->bus->card->private_data;
 65         return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
 66 }
 67 
 68 #else
 69 
 70 #define ac97_to_pscdata(x)      au1xpsc_ac97_workdata
 71 
 72 #endif
 73 
 74 /* AC97 controller reads codec register */
 75 static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
 76                                         unsigned short reg)
 77 {
 78         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
 79         unsigned short retry, tmo;
 80         unsigned long data;
 81 
 82         __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
 83         wmb(); /* drain writebuffer */
 84 
 85         retry = AC97_RW_RETRIES;
 86         do {
 87                 mutex_lock(&pscdata->lock);
 88 
 89                 __raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
 90                           AC97_CDC(pscdata));
 91                 wmb(); /* drain writebuffer */
 92 
 93                 tmo = 20;
 94                 do {
 95                         udelay(21);
 96                         if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
 97                                 break;
 98                 } while (--tmo);
 99 
100                 data = __raw_readl(AC97_CDC(pscdata));
101 
102                 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
103                 wmb(); /* drain writebuffer */
104 
105                 mutex_unlock(&pscdata->lock);
106 
107                 if (reg != ((data >> 16) & 0x7f))
108                         tmo = 1;        /* wrong register, try again */
109 
110         } while (--retry && !tmo);
111 
112         return retry ? data & 0xffff : 0xffff;
113 }
114 
115 /* AC97 controller writes to codec register */
116 static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
117                                 unsigned short val)
118 {
119         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
120         unsigned int tmo, retry;
121 
122         __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
123         wmb(); /* drain writebuffer */
124 
125         retry = AC97_RW_RETRIES;
126         do {
127                 mutex_lock(&pscdata->lock);
128 
129                 __raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
130                           AC97_CDC(pscdata));
131                 wmb(); /* drain writebuffer */
132 
133                 tmo = 20;
134                 do {
135                         udelay(21);
136                         if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
137                                 break;
138                 } while (--tmo);
139 
140                 __raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
141                 wmb(); /* drain writebuffer */
142 
143                 mutex_unlock(&pscdata->lock);
144         } while (--retry && !tmo);
145 }
146 
147 /* AC97 controller asserts a warm reset */
148 static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
149 {
150         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
151 
152         __raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
153         wmb(); /* drain writebuffer */
154         msleep(10);
155         __raw_writel(0, AC97_RST(pscdata));
156         wmb(); /* drain writebuffer */
157 }
158 
159 static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
160 {
161         struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
162         int i;
163 
164         /* disable PSC during cold reset */
165         __raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
166         wmb(); /* drain writebuffer */
167         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
168         wmb(); /* drain writebuffer */
169 
170         /* issue cold reset */
171         __raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
172         wmb(); /* drain writebuffer */
173         msleep(500);
174         __raw_writel(0, AC97_RST(pscdata));
175         wmb(); /* drain writebuffer */
176 
177         /* enable PSC */
178         __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
179         wmb(); /* drain writebuffer */
180 
181         /* wait for PSC to indicate it's ready */
182         i = 1000;
183         while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
184                 msleep(1);
185 
186         if (i == 0) {
187                 printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
188                 return;
189         }
190 
191         /* enable the ac97 function */
192         __raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
193         wmb(); /* drain writebuffer */
194 
195         /* wait for AC97 core to become ready */
196         i = 1000;
197         while (!((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
198                 msleep(1);
199         if (i == 0)
200                 printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
201 }
202 
203 /* AC97 controller operations */
204 static struct snd_ac97_bus_ops psc_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,
209 };
210 
211 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
212                                   struct snd_pcm_hw_params *params,
213                                   struct snd_soc_dai *dai)
214 {
215         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
216         unsigned long r, ro, stat;
217         int chans, t, stype = substream->stream;
218 
219         chans = params_channels(params);
220 
221         r = ro = __raw_readl(AC97_CFG(pscdata));
222         stat = __raw_readl(AC97_STAT(pscdata));
223 
224         /* already active? */
225         if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
226                 /* reject parameters not currently set up */
227                 if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
228                     (pscdata->rate != params_rate(params)))
229                         return -EINVAL;
230         } else {
231 
232                 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
233                 r &= ~PSC_AC97CFG_LEN_MASK;
234                 r |= PSC_AC97CFG_SET_LEN(params->msbits);
235 
236                 /* channels: enable slots for front L/R channel */
237                 if (stype == SNDRV_PCM_STREAM_PLAYBACK) {
238                         r &= ~PSC_AC97CFG_TXSLOT_MASK;
239                         r |= PSC_AC97CFG_TXSLOT_ENA(3);
240                         r |= PSC_AC97CFG_TXSLOT_ENA(4);
241                 } else {
242                         r &= ~PSC_AC97CFG_RXSLOT_MASK;
243                         r |= PSC_AC97CFG_RXSLOT_ENA(3);
244                         r |= PSC_AC97CFG_RXSLOT_ENA(4);
245                 }
246 
247                 /* do we need to poke the hardware? */
248                 if (!(r ^ ro))
249                         goto out;
250 
251                 /* ac97 engine is about to be disabled */
252                 mutex_lock(&pscdata->lock);
253 
254                 /* disable AC97 device controller first... */
255                 __raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
256                 wmb(); /* drain writebuffer */
257 
258                 /* ...wait for it... */
259                 t = 100;
260                 while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
261                         msleep(1);
262 
263                 if (!t)
264                         printk(KERN_ERR "PSC-AC97: can't disable!\n");
265 
266                 /* ...write config... */
267                 __raw_writel(r, AC97_CFG(pscdata));
268                 wmb(); /* drain writebuffer */
269 
270                 /* ...enable the AC97 controller again... */
271                 __raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
272                 wmb(); /* drain writebuffer */
273 
274                 /* ...and wait for ready bit */
275                 t = 100;
276                 while ((!(__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
277                         msleep(1);
278 
279                 if (!t)
280                         printk(KERN_ERR "PSC-AC97: can't enable!\n");
281 
282                 mutex_unlock(&pscdata->lock);
283 
284                 pscdata->cfg = r;
285                 pscdata->rate = params_rate(params);
286         }
287 
288 out:
289         return 0;
290 }
291 
292 static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
293                                 int cmd, struct snd_soc_dai *dai)
294 {
295         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
296         int ret, stype = substream->stream;
297 
298         ret = 0;
299 
300         switch (cmd) {
301         case SNDRV_PCM_TRIGGER_START:
302         case SNDRV_PCM_TRIGGER_RESUME:
303                 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
304                 wmb(); /* drain writebuffer */
305                 __raw_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
306                 wmb(); /* drain writebuffer */
307                 break;
308         case SNDRV_PCM_TRIGGER_STOP:
309         case SNDRV_PCM_TRIGGER_SUSPEND:
310                 __raw_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
311                 wmb(); /* drain writebuffer */
312 
313                 while (__raw_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
314                         asm volatile ("nop");
315 
316                 __raw_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
317                 wmb(); /* drain writebuffer */
318 
319                 break;
320         default:
321                 ret = -EINVAL;
322         }
323         return ret;
324 }
325 
326 static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream,
327                                 struct snd_soc_dai *dai)
328 {
329         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
330         snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
331         return 0;
332 }
333 
334 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
335 {
336         return au1xpsc_ac97_workdata ? 0 : -ENODEV;
337 }
338 
339 static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
340         .startup        = au1xpsc_ac97_startup,
341         .trigger        = au1xpsc_ac97_trigger,
342         .hw_params      = au1xpsc_ac97_hw_params,
343 };
344 
345 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
346         .ac97_control           = 1,
347         .probe                  = au1xpsc_ac97_probe,
348         .playback = {
349                 .rates          = AC97_RATES,
350                 .formats        = AC97_FMTS,
351                 .channels_min   = 2,
352                 .channels_max   = 2,
353         },
354         .capture = {
355                 .rates          = AC97_RATES,
356                 .formats        = AC97_FMTS,
357                 .channels_min   = 2,
358                 .channels_max   = 2,
359         },
360         .ops = &au1xpsc_ac97_dai_ops,
361 };
362 
363 static const struct snd_soc_component_driver au1xpsc_ac97_component = {
364         .name           = "au1xpsc-ac97",
365 };
366 
367 static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
368 {
369         int ret;
370         struct resource *iores, *dmares;
371         unsigned long sel;
372         struct au1xpsc_audio_data *wd;
373 
374         wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
375                           GFP_KERNEL);
376         if (!wd)
377                 return -ENOMEM;
378 
379         mutex_init(&wd->lock);
380 
381         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
382         wd->mmio = devm_ioremap_resource(&pdev->dev, iores);
383         if (IS_ERR(wd->mmio))
384                 return PTR_ERR(wd->mmio);
385 
386         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
387         if (!dmares)
388                 return -EBUSY;
389         wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
390 
391         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
392         if (!dmares)
393                 return -EBUSY;
394         wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
395 
396         /* configuration: max dma trigger threshold, enable ac97 */
397         wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
398                   PSC_AC97CFG_DE_ENABLE;
399 
400         /* preserve PSC clock source set up by platform  */
401         sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
402         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
403         wmb(); /* drain writebuffer */
404         __raw_writel(0, PSC_SEL(wd));
405         wmb(); /* drain writebuffer */
406         __raw_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
407         wmb(); /* drain writebuffer */
408 
409         /* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
410         memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
411                sizeof(struct snd_soc_dai_driver));
412         wd->dai_drv.name = dev_name(&pdev->dev);
413 
414         platform_set_drvdata(pdev, wd);
415 
416         ret = snd_soc_set_ac97_ops(&psc_ac97_ops);
417         if (ret)
418                 return ret;
419 
420         ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component,
421                                          &wd->dai_drv, 1);
422         if (ret)
423                 return ret;
424 
425         au1xpsc_ac97_workdata = wd;
426         return 0;
427 }
428 
429 static int au1xpsc_ac97_drvremove(struct platform_device *pdev)
430 {
431         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
432 
433         snd_soc_unregister_component(&pdev->dev);
434 
435         /* disable PSC completely */
436         __raw_writel(0, AC97_CFG(wd));
437         wmb(); /* drain writebuffer */
438         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
439         wmb(); /* drain writebuffer */
440 
441         au1xpsc_ac97_workdata = NULL;   /* MDEV */
442 
443         return 0;
444 }
445 
446 #ifdef CONFIG_PM
447 static int au1xpsc_ac97_drvsuspend(struct device *dev)
448 {
449         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
450 
451         /* save interesting registers and disable PSC */
452         wd->pm[0] = __raw_readl(PSC_SEL(wd));
453 
454         __raw_writel(0, AC97_CFG(wd));
455         wmb(); /* drain writebuffer */
456         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
457         wmb(); /* drain writebuffer */
458 
459         return 0;
460 }
461 
462 static int au1xpsc_ac97_drvresume(struct device *dev)
463 {
464         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
465 
466         /* restore PSC clock config */
467         __raw_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
468         wmb(); /* drain writebuffer */
469 
470         /* after this point the ac97 core will cold-reset the codec.
471          * During cold-reset the PSC is reinitialized and the last
472          * configuration set up in hw_params() is restored.
473          */
474         return 0;
475 }
476 
477 static struct dev_pm_ops au1xpscac97_pmops = {
478         .suspend        = au1xpsc_ac97_drvsuspend,
479         .resume         = au1xpsc_ac97_drvresume,
480 };
481 
482 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
483 
484 #else
485 
486 #define AU1XPSCAC97_PMOPS NULL
487 
488 #endif
489 
490 static struct platform_driver au1xpsc_ac97_driver = {
491         .driver = {
492                 .name   = "au1xpsc_ac97",
493                 .owner  = THIS_MODULE,
494                 .pm     = AU1XPSCAC97_PMOPS,
495         },
496         .probe          = au1xpsc_ac97_drvprobe,
497         .remove         = au1xpsc_ac97_drvremove,
498 };
499 
500 module_platform_driver(au1xpsc_ac97_driver);
501 
502 MODULE_LICENSE("GPL");
503 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
504 MODULE_AUTHOR("Manuel Lauss");
505 
506 

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