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.
13 * NOTE: all of these drivers can only work with a SINGLE instance
14 * of a PSC. Multiple independent audio devices are impossible
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/delay.h>
22 #include <linux/mutex.h>
23 #include <linux/suspend.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/initval.h>
27 #include <sound/soc.h>
28 #include <asm/mach-au1x00/au1000.h>
29 #include <asm/mach-au1x00/au1xxx_psc.h>
33 /* how often to retry failed codec register reads/writes */
34 #define AC97_RW_RETRIES 5
37 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
40 SNDRV_PCM_RATE_8000_48000
43 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
45 #define AC97PCR_START(stype) \
46 ((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
47 #define AC97PCR_STOP(stype) \
48 ((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
49 #define AC97PCR_CLRFIFO(stype) \
50 ((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
52 #define AC97STAT_BUSY(stype) \
53 ((stype) == PCM_TX ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
55 /* instance data. There can be only one, MacLeod!!!! */
56 static struct au1xpsc_audio_data
*au1xpsc_ac97_workdata
;
58 /* AC97 controller reads codec register */
59 static unsigned short au1xpsc_ac97_read(struct snd_ac97
*ac97
,
63 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
64 unsigned short retry
, tmo
;
67 au_writel(PSC_AC97EVNT_CD
, AC97_EVNT(pscdata
));
70 retry
= AC97_RW_RETRIES
;
72 mutex_lock(&pscdata
->lock
);
74 au_writel(PSC_AC97CDC_RD
| PSC_AC97CDC_INDX(reg
),
81 if (au_readl(AC97_EVNT(pscdata
)) & PSC_AC97EVNT_CD
)
85 data
= au_readl(AC97_CDC(pscdata
));
87 au_writel(PSC_AC97EVNT_CD
, AC97_EVNT(pscdata
));
90 mutex_unlock(&pscdata
->lock
);
92 if (reg
!= ((data
>> 16) & 0x7f))
93 tmo
= 1; /* wrong register, try again */
95 } while (--retry
&& !tmo
);
97 return retry
? data
& 0xffff : 0xffff;
100 /* AC97 controller writes to codec register */
101 static void au1xpsc_ac97_write(struct snd_ac97
*ac97
, unsigned short reg
,
105 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
106 unsigned int tmo
, retry
;
108 au_writel(PSC_AC97EVNT_CD
, AC97_EVNT(pscdata
));
111 retry
= AC97_RW_RETRIES
;
113 mutex_lock(&pscdata
->lock
);
115 au_writel(PSC_AC97CDC_INDX(reg
) | (val
& 0xffff),
122 if (au_readl(AC97_EVNT(pscdata
)) & PSC_AC97EVNT_CD
)
126 au_writel(PSC_AC97EVNT_CD
, AC97_EVNT(pscdata
));
129 mutex_unlock(&pscdata
->lock
);
130 } while (--retry
&& !tmo
);
133 /* AC97 controller asserts a warm reset */
134 static void au1xpsc_ac97_warm_reset(struct snd_ac97
*ac97
)
137 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
139 au_writel(PSC_AC97RST_SNC
, AC97_RST(pscdata
));
142 au_writel(0, AC97_RST(pscdata
));
146 static void au1xpsc_ac97_cold_reset(struct snd_ac97
*ac97
)
149 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
152 /* disable PSC during cold reset */
153 au_writel(0, AC97_CFG(au1xpsc_ac97_workdata
));
155 au_writel(PSC_CTRL_DISABLE
, PSC_CTRL(pscdata
));
158 /* issue cold reset */
159 au_writel(PSC_AC97RST_RST
, AC97_RST(pscdata
));
162 au_writel(0, AC97_RST(pscdata
));
166 au_writel(PSC_CTRL_ENABLE
, PSC_CTRL(pscdata
));
169 /* wait for PSC to indicate it's ready */
171 while (!((au_readl(AC97_STAT(pscdata
)) & PSC_AC97STAT_SR
)) && (--i
))
175 printk(KERN_ERR
"au1xpsc-ac97: PSC not ready!\n");
179 /* enable the ac97 function */
180 au_writel(pscdata
->cfg
| PSC_AC97CFG_DE_ENABLE
, AC97_CFG(pscdata
));
183 /* wait for AC97 core to become ready */
185 while (!((au_readl(AC97_STAT(pscdata
)) & PSC_AC97STAT_DR
)) && (--i
))
188 printk(KERN_ERR
"au1xpsc-ac97: AC97 ctrl not ready\n");
191 /* AC97 controller operations */
192 struct snd_ac97_bus_ops soc_ac97_ops
= {
193 .read
= au1xpsc_ac97_read
,
194 .write
= au1xpsc_ac97_write
,
195 .reset
= au1xpsc_ac97_cold_reset
,
196 .warm_reset
= au1xpsc_ac97_warm_reset
,
198 EXPORT_SYMBOL_GPL(soc_ac97_ops
);
200 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream
*substream
,
201 struct snd_pcm_hw_params
*params
,
202 struct snd_soc_dai
*dai
)
205 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
206 unsigned long r
, ro
, stat
;
207 int chans
, t
, stype
= SUBSTREAM_TYPE(substream
);
209 chans
= params_channels(params
);
211 r
= ro
= au_readl(AC97_CFG(pscdata
));
212 stat
= au_readl(AC97_STAT(pscdata
));
214 /* already active? */
215 if (stat
& (PSC_AC97STAT_TB
| PSC_AC97STAT_RB
)) {
216 /* reject parameters not currently set up */
217 if ((PSC_AC97CFG_GET_LEN(r
) != params
->msbits
) ||
218 (pscdata
->rate
!= params_rate(params
)))
222 /* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
223 r
&= ~PSC_AC97CFG_LEN_MASK
;
224 r
|= PSC_AC97CFG_SET_LEN(params
->msbits
);
226 /* channels: enable slots for front L/R channel */
227 if (stype
== PCM_TX
) {
228 r
&= ~PSC_AC97CFG_TXSLOT_MASK
;
229 r
|= PSC_AC97CFG_TXSLOT_ENA(3);
230 r
|= PSC_AC97CFG_TXSLOT_ENA(4);
232 r
&= ~PSC_AC97CFG_RXSLOT_MASK
;
233 r
|= PSC_AC97CFG_RXSLOT_ENA(3);
234 r
|= PSC_AC97CFG_RXSLOT_ENA(4);
237 /* do we need to poke the hardware? */
241 /* ac97 engine is about to be disabled */
242 mutex_lock(&pscdata
->lock
);
244 /* disable AC97 device controller first... */
245 au_writel(r
& ~PSC_AC97CFG_DE_ENABLE
, AC97_CFG(pscdata
));
248 /* ...wait for it... */
250 while ((au_readl(AC97_STAT(pscdata
)) & PSC_AC97STAT_DR
) && --t
)
254 printk(KERN_ERR
"PSC-AC97: can't disable!\n");
256 /* ...write config... */
257 au_writel(r
, AC97_CFG(pscdata
));
260 /* ...enable the AC97 controller again... */
261 au_writel(r
| PSC_AC97CFG_DE_ENABLE
, AC97_CFG(pscdata
));
264 /* ...and wait for ready bit */
266 while ((!(au_readl(AC97_STAT(pscdata
)) & PSC_AC97STAT_DR
)) && --t
)
270 printk(KERN_ERR
"PSC-AC97: can't enable!\n");
272 mutex_unlock(&pscdata
->lock
);
275 pscdata
->rate
= params_rate(params
);
282 static int au1xpsc_ac97_trigger(struct snd_pcm_substream
*substream
,
283 int cmd
, struct snd_soc_dai
*dai
)
286 struct au1xpsc_audio_data
*pscdata
= au1xpsc_ac97_workdata
;
287 int ret
, stype
= SUBSTREAM_TYPE(substream
);
292 case SNDRV_PCM_TRIGGER_START
:
293 case SNDRV_PCM_TRIGGER_RESUME
:
294 au_writel(AC97PCR_CLRFIFO(stype
), AC97_PCR(pscdata
));
296 au_writel(AC97PCR_START(stype
), AC97_PCR(pscdata
));
299 case SNDRV_PCM_TRIGGER_STOP
:
300 case SNDRV_PCM_TRIGGER_SUSPEND
:
301 au_writel(AC97PCR_STOP(stype
), AC97_PCR(pscdata
));
304 while (au_readl(AC97_STAT(pscdata
)) & AC97STAT_BUSY(stype
))
305 asm volatile ("nop");
307 au_writel(AC97PCR_CLRFIFO(stype
), AC97_PCR(pscdata
));
317 static int au1xpsc_ac97_probe(struct platform_device
*pdev
,
318 struct snd_soc_dai
*dai
)
320 return au1xpsc_ac97_workdata
? 0 : -ENODEV
;
323 static void au1xpsc_ac97_remove(struct platform_device
*pdev
,
324 struct snd_soc_dai
*dai
)
328 static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops
= {
329 .trigger
= au1xpsc_ac97_trigger
,
330 .hw_params
= au1xpsc_ac97_hw_params
,
333 struct snd_soc_dai au1xpsc_ac97_dai
= {
334 .name
= "au1xpsc_ac97",
336 .probe
= au1xpsc_ac97_probe
,
337 .remove
= au1xpsc_ac97_remove
,
340 .formats
= AC97_FMTS
,
346 .formats
= AC97_FMTS
,
350 .ops
= &au1xpsc_ac97_dai_ops
,
352 EXPORT_SYMBOL_GPL(au1xpsc_ac97_dai
);
354 static int __devinit
au1xpsc_ac97_drvprobe(struct platform_device
*pdev
)
359 struct au1xpsc_audio_data
*wd
;
361 if (au1xpsc_ac97_workdata
)
364 wd
= kzalloc(sizeof(struct au1xpsc_audio_data
), GFP_KERNEL
);
368 mutex_init(&wd
->lock
);
370 r
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
377 wd
->ioarea
= request_mem_region(r
->start
, r
->end
- r
->start
+ 1,
382 wd
->mmio
= ioremap(r
->start
, 0xffff);
386 /* configuration: max dma trigger threshold, enable ac97 */
387 wd
->cfg
= PSC_AC97CFG_RT_FIFO8
| PSC_AC97CFG_TT_FIFO8
|
388 PSC_AC97CFG_DE_ENABLE
;
390 /* preserve PSC clock source set up by platform */
391 sel
= au_readl(PSC_SEL(wd
)) & PSC_SEL_CLK_MASK
;
392 au_writel(PSC_CTRL_DISABLE
, PSC_CTRL(wd
));
394 au_writel(0, PSC_SEL(wd
));
396 au_writel(PSC_SEL_PS_AC97MODE
| sel
, PSC_SEL(wd
));
399 ret
= snd_soc_register_dai(&au1xpsc_ac97_dai
);
403 wd
->dmapd
= au1xpsc_pcm_add(pdev
);
405 platform_set_drvdata(pdev
, wd
);
406 au1xpsc_ac97_workdata
= wd
; /* MDEV */
410 snd_soc_unregister_dai(&au1xpsc_ac97_dai
);
412 release_resource(wd
->ioarea
);
419 static int __devexit
au1xpsc_ac97_drvremove(struct platform_device
*pdev
)
421 struct au1xpsc_audio_data
*wd
= platform_get_drvdata(pdev
);
424 au1xpsc_pcm_destroy(wd
->dmapd
);
426 snd_soc_unregister_dai(&au1xpsc_ac97_dai
);
428 /* disable PSC completely */
429 au_writel(0, AC97_CFG(wd
));
431 au_writel(PSC_CTRL_DISABLE
, PSC_CTRL(wd
));
435 release_resource(wd
->ioarea
);
439 au1xpsc_ac97_workdata
= NULL
; /* MDEV */
445 static int au1xpsc_ac97_drvsuspend(struct device
*dev
)
447 struct au1xpsc_audio_data
*wd
= dev_get_drvdata(dev
);
449 /* save interesting registers and disable PSC */
450 wd
->pm
[0] = au_readl(PSC_SEL(wd
));
452 au_writel(0, AC97_CFG(wd
));
454 au_writel(PSC_CTRL_DISABLE
, PSC_CTRL(wd
));
460 static int au1xpsc_ac97_drvresume(struct device
*dev
)
462 struct au1xpsc_audio_data
*wd
= dev_get_drvdata(dev
);
464 /* restore PSC clock config */
465 au_writel(wd
->pm
[0] | PSC_SEL_PS_AC97MODE
, PSC_SEL(wd
));
468 /* after this point the ac97 core will cold-reset the codec.
469 * During cold-reset the PSC is reinitialized and the last
470 * configuration set up in hw_params() is restored.
475 static struct dev_pm_ops au1xpscac97_pmops
= {
476 .suspend
= au1xpsc_ac97_drvsuspend
,
477 .resume
= au1xpsc_ac97_drvresume
,
480 #define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
484 #define AU1XPSCAC97_PMOPS NULL
488 static struct platform_driver au1xpsc_ac97_driver
= {
490 .name
= "au1xpsc_ac97",
491 .owner
= THIS_MODULE
,
492 .pm
= AU1XPSCAC97_PMOPS
,
494 .probe
= au1xpsc_ac97_drvprobe
,
495 .remove
= __devexit_p(au1xpsc_ac97_drvremove
),
498 static int __init
au1xpsc_ac97_load(void)
500 au1xpsc_ac97_workdata
= NULL
;
501 return platform_driver_register(&au1xpsc_ac97_driver
);
504 static void __exit
au1xpsc_ac97_unload(void)
506 platform_driver_unregister(&au1xpsc_ac97_driver
);
509 module_init(au1xpsc_ac97_load
);
510 module_exit(au1xpsc_ac97_unload
);
512 MODULE_LICENSE("GPL");
513 MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
514 MODULE_AUTHOR("Manuel Lauss");