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Linux/sound/soc/au1x/psc-i2s.c

  1 /*
  2  * Au12x0/Au1550 PSC ALSA ASoC audio support.
  3  *
  4  * (c) 2007-2008 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 I2S glue.
 12  *
 13  * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
 14  */
 15 
 16 #include <linux/init.h>
 17 #include <linux/module.h>
 18 #include <linux/slab.h>
 19 #include <linux/suspend.h>
 20 #include <sound/core.h>
 21 #include <sound/pcm.h>
 22 #include <sound/initval.h>
 23 #include <sound/soc.h>
 24 #include <asm/mach-au1x00/au1000.h>
 25 #include <asm/mach-au1x00/au1xxx_psc.h>
 26 
 27 #include "psc.h"
 28 
 29 /* supported I2S DAI hardware formats */
 30 #define AU1XPSC_I2S_DAIFMT \
 31         (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |   \
 32          SND_SOC_DAIFMT_NB_NF)
 33 
 34 /* supported I2S direction */
 35 #define AU1XPSC_I2S_DIR \
 36         (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
 37 
 38 #define AU1XPSC_I2S_RATES \
 39         SNDRV_PCM_RATE_8000_192000
 40 
 41 #define AU1XPSC_I2S_FMTS \
 42         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
 43 
 44 #define I2SSTAT_BUSY(stype)     \
 45         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
 46 #define I2SPCR_START(stype)     \
 47         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
 48 #define I2SPCR_STOP(stype)      \
 49         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
 50 #define I2SPCR_CLRFIFO(stype)   \
 51         ((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
 52 
 53 
 54 static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 55                                unsigned int fmt)
 56 {
 57         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai);
 58         unsigned long ct;
 59         int ret;
 60 
 61         ret = -EINVAL;
 62 
 63         ct = pscdata->cfg;
 64 
 65         ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);        /* left-justified */
 66         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 67         case SND_SOC_DAIFMT_I2S:
 68                 ct |= PSC_I2SCFG_XM;    /* enable I2S mode */
 69                 break;
 70         case SND_SOC_DAIFMT_MSB:
 71                 break;
 72         case SND_SOC_DAIFMT_LSB:
 73                 ct |= PSC_I2SCFG_MLJ;   /* LSB (right-) justified */
 74                 break;
 75         default:
 76                 goto out;
 77         }
 78 
 79         ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);         /* IB-IF */
 80         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 81         case SND_SOC_DAIFMT_NB_NF:
 82                 ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
 83                 break;
 84         case SND_SOC_DAIFMT_NB_IF:
 85                 ct |= PSC_I2SCFG_BI;
 86                 break;
 87         case SND_SOC_DAIFMT_IB_NF:
 88                 ct |= PSC_I2SCFG_WI;
 89                 break;
 90         case SND_SOC_DAIFMT_IB_IF:
 91                 break;
 92         default:
 93                 goto out;
 94         }
 95 
 96         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 97         case SND_SOC_DAIFMT_CBM_CFM:    /* CODEC master */
 98                 ct |= PSC_I2SCFG_MS;    /* PSC I2S slave mode */
 99                 break;
100         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
101                 ct &= ~PSC_I2SCFG_MS;   /* PSC I2S Master mode */
102                 break;
103         default:
104                 goto out;
105         }
106 
107         pscdata->cfg = ct;
108         ret = 0;
109 out:
110         return ret;
111 }
112 
113 static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
114                                  struct snd_pcm_hw_params *params,
115                                  struct snd_soc_dai *dai)
116 {
117         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
118 
119         int cfgbits;
120         unsigned long stat;
121 
122         /* check if the PSC is already streaming data */
123         stat = __raw_readl(I2S_STAT(pscdata));
124         if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
125                 /* reject parameters not currently set up in hardware */
126                 cfgbits = __raw_readl(I2S_CFG(pscdata));
127                 if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
128                     (params_rate(params) != pscdata->rate))
129                         return -EINVAL;
130         } else {
131                 /* set sample bitdepth */
132                 pscdata->cfg &= ~(0x1f << 4);
133                 pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
134                 /* remember current rate for other stream */
135                 pscdata->rate = params_rate(params);
136         }
137         return 0;
138 }
139 
140 /* Configure PSC late:  on my devel systems the codec  is I2S master and
141  * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
142  * uses aggressive PM and  switches the codec off  when it is not in use
143  * which also means the PSC unit doesn't get any clocks and is therefore
144  * dead. That's why this chunk here gets called from the trigger callback
145  * because I can be reasonably certain the codec is driving the clocks.
146  */
147 static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
148 {
149         unsigned long tmo;
150 
151         /* bring PSC out of sleep, and configure I2S unit */
152         __raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
153         wmb(); /* drain writebuffer */
154 
155         tmo = 1000000;
156         while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
157                 tmo--;
158 
159         if (!tmo)
160                 goto psc_err;
161 
162         __raw_writel(0, I2S_CFG(pscdata));
163         wmb(); /* drain writebuffer */
164         __raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
165         wmb(); /* drain writebuffer */
166 
167         /* wait for I2S controller to become ready */
168         tmo = 1000000;
169         while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
170                 tmo--;
171 
172         if (tmo)
173                 return 0;
174 
175 psc_err:
176         __raw_writel(0, I2S_CFG(pscdata));
177         __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
178         wmb(); /* drain writebuffer */
179         return -ETIMEDOUT;
180 }
181 
182 static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
183 {
184         unsigned long tmo, stat;
185         int ret;
186 
187         ret = 0;
188 
189         /* if both TX and RX are idle, configure the PSC  */
190         stat = __raw_readl(I2S_STAT(pscdata));
191         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
192                 ret = au1xpsc_i2s_configure(pscdata);
193                 if (ret)
194                         goto out;
195         }
196 
197         __raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
198         wmb(); /* drain writebuffer */
199         __raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
200         wmb(); /* drain writebuffer */
201 
202         /* wait for start confirmation */
203         tmo = 1000000;
204         while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
205                 tmo--;
206 
207         if (!tmo) {
208                 __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
209                 wmb(); /* drain writebuffer */
210                 ret = -ETIMEDOUT;
211         }
212 out:
213         return ret;
214 }
215 
216 static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
217 {
218         unsigned long tmo, stat;
219 
220         __raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
221         wmb(); /* drain writebuffer */
222 
223         /* wait for stop confirmation */
224         tmo = 1000000;
225         while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
226                 tmo--;
227 
228         /* if both TX and RX are idle, disable PSC */
229         stat = __raw_readl(I2S_STAT(pscdata));
230         if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
231                 __raw_writel(0, I2S_CFG(pscdata));
232                 wmb(); /* drain writebuffer */
233                 __raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
234                 wmb(); /* drain writebuffer */
235         }
236         return 0;
237 }
238 
239 static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
240                                struct snd_soc_dai *dai)
241 {
242         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
243         int ret, stype = substream->stream;
244 
245         switch (cmd) {
246         case SNDRV_PCM_TRIGGER_START:
247         case SNDRV_PCM_TRIGGER_RESUME:
248                 ret = au1xpsc_i2s_start(pscdata, stype);
249                 break;
250         case SNDRV_PCM_TRIGGER_STOP:
251         case SNDRV_PCM_TRIGGER_SUSPEND:
252                 ret = au1xpsc_i2s_stop(pscdata, stype);
253                 break;
254         default:
255                 ret = -EINVAL;
256         }
257         return ret;
258 }
259 
260 static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream,
261                                struct snd_soc_dai *dai)
262 {
263         struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
264         snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
265         return 0;
266 }
267 
268 static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
269         .startup        = au1xpsc_i2s_startup,
270         .trigger        = au1xpsc_i2s_trigger,
271         .hw_params      = au1xpsc_i2s_hw_params,
272         .set_fmt        = au1xpsc_i2s_set_fmt,
273 };
274 
275 static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = {
276         .playback = {
277                 .rates          = AU1XPSC_I2S_RATES,
278                 .formats        = AU1XPSC_I2S_FMTS,
279                 .channels_min   = 2,
280                 .channels_max   = 8,    /* 2 without external help */
281         },
282         .capture = {
283                 .rates          = AU1XPSC_I2S_RATES,
284                 .formats        = AU1XPSC_I2S_FMTS,
285                 .channels_min   = 2,
286                 .channels_max   = 8,    /* 2 without external help */
287         },
288         .ops = &au1xpsc_i2s_dai_ops,
289 };
290 
291 static const struct snd_soc_component_driver au1xpsc_i2s_component = {
292         .name           = "au1xpsc-i2s",
293 };
294 
295 static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
296 {
297         struct resource *iores, *dmares;
298         unsigned long sel;
299         int ret;
300         struct au1xpsc_audio_data *wd;
301 
302         wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
303                           GFP_KERNEL);
304         if (!wd)
305                 return -ENOMEM;
306 
307         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
308         if (!iores)
309                 return -ENODEV;
310 
311         ret = -EBUSY;
312         if (!devm_request_mem_region(&pdev->dev, iores->start,
313                                      resource_size(iores),
314                                      pdev->name))
315                 return -EBUSY;
316 
317         wd->mmio = devm_ioremap(&pdev->dev, iores->start,
318                                 resource_size(iores));
319         if (!wd->mmio)
320                 return -EBUSY;
321 
322         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
323         if (!dmares)
324                 return -EBUSY;
325         wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
326 
327         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
328         if (!dmares)
329                 return -EBUSY;
330         wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
331 
332         /* preserve PSC clock source set up by platform (dev.platform_data
333          * is already occupied by soc layer)
334          */
335         sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
336         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
337         wmb(); /* drain writebuffer */
338         __raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
339         __raw_writel(0, I2S_CFG(wd));
340         wmb(); /* drain writebuffer */
341 
342         /* preconfigure: set max rx/tx fifo depths */
343         wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
344 
345         /* don't wait for I2S core to become ready now; clocks may not
346          * be running yet; depending on clock input for PSC a wait might
347          * time out.
348          */
349 
350         /* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */
351         memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template,
352                sizeof(struct snd_soc_dai_driver));
353         wd->dai_drv.name = dev_name(&pdev->dev);
354 
355         platform_set_drvdata(pdev, wd);
356 
357         return snd_soc_register_component(&pdev->dev, &au1xpsc_i2s_component,
358                                           &wd->dai_drv, 1);
359 }
360 
361 static int au1xpsc_i2s_drvremove(struct platform_device *pdev)
362 {
363         struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
364 
365         snd_soc_unregister_component(&pdev->dev);
366 
367         __raw_writel(0, I2S_CFG(wd));
368         wmb(); /* drain writebuffer */
369         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
370         wmb(); /* drain writebuffer */
371 
372         return 0;
373 }
374 
375 #ifdef CONFIG_PM
376 static int au1xpsc_i2s_drvsuspend(struct device *dev)
377 {
378         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
379 
380         /* save interesting register and disable PSC */
381         wd->pm[0] = __raw_readl(PSC_SEL(wd));
382 
383         __raw_writel(0, I2S_CFG(wd));
384         wmb(); /* drain writebuffer */
385         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
386         wmb(); /* drain writebuffer */
387 
388         return 0;
389 }
390 
391 static int au1xpsc_i2s_drvresume(struct device *dev)
392 {
393         struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
394 
395         /* select I2S mode and PSC clock */
396         __raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
397         wmb(); /* drain writebuffer */
398         __raw_writel(0, PSC_SEL(wd));
399         wmb(); /* drain writebuffer */
400         __raw_writel(wd->pm[0], PSC_SEL(wd));
401         wmb(); /* drain writebuffer */
402 
403         return 0;
404 }
405 
406 static struct dev_pm_ops au1xpsci2s_pmops = {
407         .suspend        = au1xpsc_i2s_drvsuspend,
408         .resume         = au1xpsc_i2s_drvresume,
409 };
410 
411 #define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
412 
413 #else
414 
415 #define AU1XPSCI2S_PMOPS NULL
416 
417 #endif
418 
419 static struct platform_driver au1xpsc_i2s_driver = {
420         .driver         = {
421                 .name   = "au1xpsc_i2s",
422                 .owner  = THIS_MODULE,
423                 .pm     = AU1XPSCI2S_PMOPS,
424         },
425         .probe          = au1xpsc_i2s_drvprobe,
426         .remove         = au1xpsc_i2s_drvremove,
427 };
428 
429 module_platform_driver(au1xpsc_i2s_driver);
430 
431 MODULE_LICENSE("GPL");
432 MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
433 MODULE_AUTHOR("Manuel Lauss");
434 

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