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Linux/sound/soc/pxa/mmp-sspa.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * linux/sound/soc/pxa/mmp-sspa.c
  4  * Base on pxa2xx-ssp.c
  5  *
  6  * Copyright (C) 2011 Marvell International Ltd.
  7  */
  8 #include <linux/init.h>
  9 #include <linux/module.h>
 10 #include <linux/platform_device.h>
 11 #include <linux/delay.h>
 12 #include <linux/clk.h>
 13 #include <linux/slab.h>
 14 #include <linux/io.h>
 15 #include <linux/dmaengine.h>
 16 #include <linux/pm_runtime.h>
 17 
 18 #include <sound/core.h>
 19 #include <sound/pcm.h>
 20 #include <sound/initval.h>
 21 #include <sound/pcm_params.h>
 22 #include <sound/soc.h>
 23 #include <sound/pxa2xx-lib.h>
 24 #include <sound/dmaengine_pcm.h>
 25 #include "mmp-sspa.h"
 26 
 27 /*
 28  * SSPA audio private data
 29  */
 30 struct sspa_priv {
 31         void __iomem *tx_base;
 32         void __iomem *rx_base;
 33 
 34         struct snd_dmaengine_dai_dma_data playback_dma_data;
 35         struct snd_dmaengine_dai_dma_data capture_dma_data;
 36         struct clk *clk;
 37         struct clk *audio_clk;
 38         struct clk *sysclk;
 39 
 40         int running_cnt;
 41         u32 sp;
 42         u32 ctrl;
 43 };
 44 
 45 static void mmp_sspa_tx_enable(struct sspa_priv *sspa)
 46 {
 47         unsigned int sspa_sp = sspa->sp;
 48 
 49         sspa_sp &= ~SSPA_SP_MSL;
 50         sspa_sp |= SSPA_SP_S_EN;
 51         sspa_sp |= SSPA_SP_WEN;
 52         __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
 53 }
 54 
 55 static void mmp_sspa_tx_disable(struct sspa_priv *sspa)
 56 {
 57         unsigned int sspa_sp = sspa->sp;
 58 
 59         sspa_sp &= ~SSPA_SP_MSL;
 60         sspa_sp &= ~SSPA_SP_S_EN;
 61         sspa_sp |= SSPA_SP_WEN;
 62         __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
 63 }
 64 
 65 static void mmp_sspa_rx_enable(struct sspa_priv *sspa)
 66 {
 67         unsigned int sspa_sp = sspa->sp;
 68 
 69         sspa_sp |= SSPA_SP_S_EN;
 70         sspa_sp |= SSPA_SP_WEN;
 71         __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
 72 }
 73 
 74 static void mmp_sspa_rx_disable(struct sspa_priv *sspa)
 75 {
 76         unsigned int sspa_sp = sspa->sp;
 77 
 78         sspa_sp &= ~SSPA_SP_S_EN;
 79         sspa_sp |= SSPA_SP_WEN;
 80         __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
 81 }
 82 
 83 static int mmp_sspa_startup(struct snd_pcm_substream *substream,
 84         struct snd_soc_dai *dai)
 85 {
 86         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
 87 
 88         clk_prepare_enable(sspa->sysclk);
 89         clk_prepare_enable(sspa->clk);
 90 
 91         return 0;
 92 }
 93 
 94 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
 95         struct snd_soc_dai *dai)
 96 {
 97         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
 98 
 99         clk_disable_unprepare(sspa->clk);
100         clk_disable_unprepare(sspa->sysclk);
101 }
102 
103 /*
104  * Set the SSP ports SYSCLK.
105  */
106 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
107                                     int clk_id, unsigned int freq, int dir)
108 {
109         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
110         struct device *dev = cpu_dai->component->dev;
111         int ret = 0;
112 
113         if (dev->of_node)
114                 return -ENOTSUPP;
115 
116         switch (clk_id) {
117         case MMP_SSPA_CLK_AUDIO:
118                 ret = clk_set_rate(sspa->audio_clk, freq);
119                 if (ret)
120                         return ret;
121                 break;
122         case MMP_SSPA_CLK_PLL:
123         case MMP_SSPA_CLK_VCXO:
124                 /* not support yet */
125                 return -EINVAL;
126         default:
127                 return -EINVAL;
128         }
129 
130         return 0;
131 }
132 
133 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
134                                  int source, unsigned int freq_in,
135                                  unsigned int freq_out)
136 {
137         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
138         struct device *dev = cpu_dai->component->dev;
139         int ret = 0;
140 
141         if (dev->of_node)
142                 return -ENOTSUPP;
143 
144         switch (pll_id) {
145         case MMP_SYSCLK:
146                 ret = clk_set_rate(sspa->sysclk, freq_out);
147                 if (ret)
148                         return ret;
149                 break;
150         case MMP_SSPA_CLK:
151                 ret = clk_set_rate(sspa->clk, freq_out);
152                 if (ret)
153                         return ret;
154                 break;
155         default:
156                 return -ENODEV;
157         }
158 
159         return 0;
160 }
161 
162 /*
163  * Set up the sspa dai format.
164  */
165 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
166                                  unsigned int fmt)
167 {
168         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
169 
170         /* reset port settings */
171         sspa->sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
172         sspa->ctrl = 0;
173 
174         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
175         case SND_SOC_DAIFMT_CBS_CFS:
176                 sspa->sp |= SSPA_SP_MSL;
177                 break;
178         case SND_SOC_DAIFMT_CBM_CFM:
179                 break;
180         default:
181                 return -EINVAL;
182         }
183 
184         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
185         case SND_SOC_DAIFMT_NB_NF:
186                 sspa->sp |= SSPA_SP_FSP;
187                 break;
188         default:
189                 return -EINVAL;
190         }
191 
192         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
193         case SND_SOC_DAIFMT_I2S:
194                 sspa->ctrl |= SSPA_CTL_XDATDLY(1);
195                 break;
196         default:
197                 return -EINVAL;
198         }
199 
200         /* Since we are configuring the timings for the format by hand
201          * we have to defer some things until hw_params() where we
202          * know parameters like the sample size.
203          */
204         return 0;
205 }
206 
207 /*
208  * Set the SSPA audio DMA parameters and sample size.
209  * Can be called multiple times by oss emulation.
210  */
211 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
212                                struct snd_pcm_hw_params *params,
213                                struct snd_soc_dai *dai)
214 {
215         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
216         struct device *dev = dai->component->dev;
217         u32 sspa_ctrl = sspa->ctrl;
218         int bits;
219         int bitval;
220 
221         switch (params_format(params)) {
222         case SNDRV_PCM_FORMAT_S8:
223                 bits = 8;
224                 bitval = SSPA_CTL_8_BITS;
225                 break;
226         case SNDRV_PCM_FORMAT_S16_LE:
227                 bits = 16;
228                 bitval = SSPA_CTL_16_BITS;
229                 break;
230         case SNDRV_PCM_FORMAT_S24_3LE:
231                 bits = 24;
232                 bitval = SSPA_CTL_24_BITS;
233                 break;
234         case SNDRV_PCM_FORMAT_S32_LE:
235                 bits = 32;
236                 bitval = SSPA_CTL_32_BITS;
237                 break;
238         default:
239                 return -EINVAL;
240         }
241 
242         sspa_ctrl &= ~SSPA_CTL_XPH;
243         if (dev->of_node || params_channels(params) == 2)
244                 sspa_ctrl |= SSPA_CTL_XPH;
245 
246         sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
247         sspa_ctrl |= SSPA_CTL_XWDLEN1(bitval);
248 
249         sspa_ctrl &= ~SSPA_CTL_XWDLEN2_MASK;
250         sspa_ctrl |= SSPA_CTL_XWDLEN2(bitval);
251 
252         sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
253         sspa_ctrl |= SSPA_CTL_XSSZ1(bitval);
254 
255         sspa_ctrl &= ~SSPA_CTL_XSSZ2_MASK;
256         sspa_ctrl |= SSPA_CTL_XSSZ2(bitval);
257 
258         sspa->sp &= ~SSPA_SP_FWID_MASK;
259         sspa->sp |= SSPA_SP_FWID(bits - 1);
260 
261         sspa->sp &= ~SSPA_TXSP_FPER_MASK;
262         sspa->sp |= SSPA_TXSP_FPER(bits * 2 - 1);
263 
264         if (dev->of_node) {
265                 clk_set_rate(sspa->clk, params_rate(params) *
266                                         params_channels(params) * bits);
267         }
268 
269         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
270                 __raw_writel(sspa_ctrl, sspa->tx_base + SSPA_CTL);
271                 __raw_writel(0x1, sspa->tx_base + SSPA_FIFO_UL);
272         } else {
273                 __raw_writel(sspa_ctrl, sspa->rx_base + SSPA_CTL);
274                 __raw_writel(0x0, sspa->rx_base + SSPA_FIFO_UL);
275         }
276 
277         return 0;
278 }
279 
280 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
281                              struct snd_soc_dai *dai)
282 {
283         struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
284         int ret = 0;
285 
286         switch (cmd) {
287         case SNDRV_PCM_TRIGGER_START:
288         case SNDRV_PCM_TRIGGER_RESUME:
289         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
290                 /*
291                  * whatever playback or capture, must enable rx.
292                  * this is a hw issue, so need check if rx has been
293                  * enabled or not; if has been enabled by another
294                  * stream, do not enable again.
295                  */
296                 if (!sspa->running_cnt)
297                         mmp_sspa_rx_enable(sspa);
298 
299                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
300                         mmp_sspa_tx_enable(sspa);
301 
302                 sspa->running_cnt++;
303                 break;
304 
305         case SNDRV_PCM_TRIGGER_STOP:
306         case SNDRV_PCM_TRIGGER_SUSPEND:
307         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
308                 sspa->running_cnt--;
309 
310                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
311                         mmp_sspa_tx_disable(sspa);
312 
313                 /* have no capture stream, disable rx port */
314                 if (!sspa->running_cnt)
315                         mmp_sspa_rx_disable(sspa);
316                 break;
317 
318         default:
319                 ret = -EINVAL;
320         }
321 
322         return ret;
323 }
324 
325 static int mmp_sspa_probe(struct snd_soc_dai *dai)
326 {
327         struct sspa_priv *sspa = dev_get_drvdata(dai->dev);
328 
329         snd_soc_dai_init_dma_data(dai,
330                                 &sspa->playback_dma_data,
331                                 &sspa->capture_dma_data);
332 
333         return 0;
334 }
335 
336 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
337 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
338                 SNDRV_PCM_FMTBIT_S16_LE | \
339                 SNDRV_PCM_FMTBIT_S24_3LE | \
340                 SNDRV_PCM_FMTBIT_S32_LE)
341 
342 static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
343         .startup        = mmp_sspa_startup,
344         .shutdown       = mmp_sspa_shutdown,
345         .trigger        = mmp_sspa_trigger,
346         .hw_params      = mmp_sspa_hw_params,
347         .set_sysclk     = mmp_sspa_set_dai_sysclk,
348         .set_pll        = mmp_sspa_set_dai_pll,
349         .set_fmt        = mmp_sspa_set_dai_fmt,
350 };
351 
352 static struct snd_soc_dai_driver mmp_sspa_dai = {
353         .probe = mmp_sspa_probe,
354         .playback = {
355                 .channels_min = 1,
356                 .channels_max = 128,
357                 .rates = MMP_SSPA_RATES,
358                 .formats = MMP_SSPA_FORMATS,
359         },
360         .capture = {
361                 .channels_min = 1,
362                 .channels_max = 2,
363                 .rates = MMP_SSPA_RATES,
364                 .formats = MMP_SSPA_FORMATS,
365         },
366         .ops = &mmp_sspa_dai_ops,
367 };
368 
369 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
370                 SNDRV_PCM_INFO_MMAP_VALID |     \
371                 SNDRV_PCM_INFO_INTERLEAVED |    \
372                 SNDRV_PCM_INFO_PAUSE |          \
373                 SNDRV_PCM_INFO_RESUME |         \
374                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
375 
376 static const struct snd_pcm_hardware mmp_pcm_hardware[] = {
377         {
378                 .info                   = MMP_PCM_INFO,
379                 .period_bytes_min       = 1024,
380                 .period_bytes_max       = 2048,
381                 .periods_min            = 2,
382                 .periods_max            = 32,
383                 .buffer_bytes_max       = 4096,
384                 .fifo_size              = 32,
385         },
386         {
387                 .info                   = MMP_PCM_INFO,
388                 .period_bytes_min       = 1024,
389                 .period_bytes_max       = 2048,
390                 .periods_min            = 2,
391                 .periods_max            = 32,
392                 .buffer_bytes_max       = 4096,
393                 .fifo_size              = 32,
394         },
395 };
396 
397 static const struct snd_dmaengine_pcm_config mmp_pcm_config = {
398         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
399         .pcm_hardware = mmp_pcm_hardware,
400         .prealloc_buffer_size = 4096,
401 };
402 
403 static int mmp_pcm_mmap(struct snd_soc_component *component,
404                         struct snd_pcm_substream *substream,
405                         struct vm_area_struct *vma)
406 {
407         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
408         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
409         return remap_pfn_range(vma, vma->vm_start,
410                 substream->dma_buffer.addr >> PAGE_SHIFT,
411                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
412 }
413 
414 static int mmp_sspa_open(struct snd_soc_component *component,
415                          struct snd_pcm_substream *substream)
416 {
417         struct sspa_priv *sspa = snd_soc_component_get_drvdata(component);
418 
419         pm_runtime_get_sync(component->dev);
420 
421         /* we can only change the settings if the port is not in use */
422         if ((__raw_readl(sspa->tx_base + SSPA_SP) & SSPA_SP_S_EN) ||
423             (__raw_readl(sspa->rx_base + SSPA_SP) & SSPA_SP_S_EN)) {
424                 dev_err(component->dev,
425                         "can't change hardware dai format: stream is in use\n");
426                 return -EBUSY;
427         }
428 
429         __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
430         __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
431 
432         sspa->sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
433         __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
434         __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
435 
436         /*
437          * FIXME: hw issue, for the tx serial port,
438          * can not config the master/slave mode;
439          * so must clean this bit.
440          * The master/slave mode has been set in the
441          * rx port.
442          */
443         __raw_writel(sspa->sp & ~SSPA_SP_MSL, sspa->tx_base + SSPA_SP);
444 
445         __raw_writel(sspa->ctrl, sspa->tx_base + SSPA_CTL);
446         __raw_writel(sspa->ctrl, sspa->rx_base + SSPA_CTL);
447 
448         return 0;
449 }
450 
451 static int mmp_sspa_close(struct snd_soc_component *component,
452                           struct snd_pcm_substream *substream)
453 {
454         pm_runtime_put_sync(component->dev);
455         return 0;
456 }
457 
458 static const struct snd_soc_component_driver mmp_sspa_component = {
459         .name           = "mmp-sspa",
460         .mmap           = mmp_pcm_mmap,
461         .open           = mmp_sspa_open,
462         .close          = mmp_sspa_close,
463 };
464 
465 static int asoc_mmp_sspa_probe(struct platform_device *pdev)
466 {
467         struct sspa_priv *sspa;
468         int ret;
469 
470         sspa = devm_kzalloc(&pdev->dev,
471                                 sizeof(struct sspa_priv), GFP_KERNEL);
472         if (!sspa)
473                 return -ENOMEM;
474 
475         if (pdev->dev.of_node) {
476                 sspa->rx_base = devm_platform_ioremap_resource(pdev, 0);
477                 if (IS_ERR(sspa->rx_base))
478                         return PTR_ERR(sspa->rx_base);
479 
480                 sspa->tx_base = devm_platform_ioremap_resource(pdev, 1);
481                 if (IS_ERR(sspa->tx_base))
482                         return PTR_ERR(sspa->tx_base);
483 
484                 sspa->clk = devm_clk_get(&pdev->dev, "bitclk");
485                 if (IS_ERR(sspa->clk))
486                         return PTR_ERR(sspa->clk);
487 
488                 sspa->audio_clk = devm_clk_get(&pdev->dev, "audio");
489                 if (IS_ERR(sspa->audio_clk))
490                         return PTR_ERR(sspa->audio_clk);
491         } else {
492                 struct resource *res;
493 
494                 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
495                 if (res == NULL)
496                         return -ENODEV;
497 
498                 sspa->rx_base = devm_ioremap(&pdev->dev, res->start, 0x30);
499                 if (!sspa->rx_base)
500                         return -ENOMEM;
501 
502                 sspa->tx_base = devm_ioremap(&pdev->dev,
503                                              res->start + 0x80, 0x30);
504                 if (!sspa->tx_base)
505                         return -ENOMEM;
506 
507                 sspa->clk = devm_clk_get(&pdev->dev, NULL);
508                 if (IS_ERR(sspa->clk))
509                         return PTR_ERR(sspa->clk);
510 
511                 sspa->audio_clk = clk_get(NULL, "mmp-audio");
512                 if (IS_ERR(sspa->audio_clk))
513                         return PTR_ERR(sspa->audio_clk);
514 
515                 sspa->sysclk = clk_get(NULL, "mmp-sysclk");
516                 if (IS_ERR(sspa->sysclk)) {
517                         clk_put(sspa->audio_clk);
518                         return PTR_ERR(sspa->sysclk);
519                 }
520         }
521         platform_set_drvdata(pdev, sspa);
522 
523         sspa->playback_dma_data.maxburst = 4;
524         sspa->capture_dma_data.maxburst = 4;
525         /* You know, these addresses are actually ignored. */
526         sspa->capture_dma_data.addr = SSPA_D;
527         sspa->playback_dma_data.addr = 0x80 + SSPA_D;
528 
529         if (pdev->dev.of_node) {
530                 ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
531                                                       &mmp_pcm_config, 0);
532                 if (ret)
533                         return ret;
534         }
535 
536         ret = devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
537                                               &mmp_sspa_dai, 1);
538         if (ret)
539                 return ret;
540 
541         pm_runtime_enable(&pdev->dev);
542         clk_prepare_enable(sspa->audio_clk);
543 
544         return 0;
545 }
546 
547 static int asoc_mmp_sspa_remove(struct platform_device *pdev)
548 {
549         struct sspa_priv *sspa = platform_get_drvdata(pdev);
550 
551         clk_disable_unprepare(sspa->audio_clk);
552         pm_runtime_disable(&pdev->dev);
553 
554         if (pdev->dev.of_node)
555                 return 0;
556 
557         clk_put(sspa->audio_clk);
558         clk_put(sspa->sysclk);
559         return 0;
560 }
561 
562 #ifdef CONFIG_OF
563 static const struct of_device_id mmp_sspa_of_match[] = {
564         { .compatible = "marvell,mmp-sspa" },
565         {},
566 };
567 
568 MODULE_DEVICE_TABLE(of, mmp_sspa_of_match);
569 #endif
570 
571 static struct platform_driver asoc_mmp_sspa_driver = {
572         .driver = {
573                 .name = "mmp-sspa-dai",
574                 .of_match_table = of_match_ptr(mmp_sspa_of_match),
575         },
576         .probe = asoc_mmp_sspa_probe,
577         .remove = asoc_mmp_sspa_remove,
578 };
579 
580 module_platform_driver(asoc_mmp_sspa_driver);
581 
582 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
583 MODULE_DESCRIPTION("MMP SSPA SoC Interface");
584 MODULE_LICENSE("GPL");
585 MODULE_ALIAS("platform:mmp-sspa-dai");
586 

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