1 // SPDX-License-Identifier: GPL-2.0
3 // ALSA SoC Audio Layer - S3C PCM-Controller driver
5 // Copyright (c) 2009 Samsung Electronics Co. Ltd
6 // Author: Jaswinder Singh <jassisinghbrar@gmail.com>
7 // based upon I2S drivers by Ben Dooks.
11 #include <linux/module.h>
12 #include <linux/pm_runtime.h>
14 #include <sound/soc.h>
15 #include <sound/pcm_params.h>
17 #include <linux/platform_data/asoc-s3c.h>
23 #define S3C_PCM_CTL 0x00
24 #define S3C_PCM_CLKCTL 0x04
25 #define S3C_PCM_TXFIFO 0x08
26 #define S3C_PCM_RXFIFO 0x0C
27 #define S3C_PCM_IRQCTL 0x10
28 #define S3C_PCM_IRQSTAT 0x14
29 #define S3C_PCM_FIFOSTAT 0x18
30 #define S3C_PCM_CLRINT 0x20
32 /* PCM_CTL Bit-Fields */
33 #define S3C_PCM_CTL_TXDIPSTICK_MASK 0x3f
34 #define S3C_PCM_CTL_TXDIPSTICK_SHIFT 13
35 #define S3C_PCM_CTL_RXDIPSTICK_MASK 0x3f
36 #define S3C_PCM_CTL_RXDIPSTICK_SHIFT 7
37 #define S3C_PCM_CTL_TXDMA_EN (0x1 << 6)
38 #define S3C_PCM_CTL_RXDMA_EN (0x1 << 5)
39 #define S3C_PCM_CTL_TXMSB_AFTER_FSYNC (0x1 << 4)
40 #define S3C_PCM_CTL_RXMSB_AFTER_FSYNC (0x1 << 3)
41 #define S3C_PCM_CTL_TXFIFO_EN (0x1 << 2)
42 #define S3C_PCM_CTL_RXFIFO_EN (0x1 << 1)
43 #define S3C_PCM_CTL_ENABLE (0x1 << 0)
45 /* PCM_CLKCTL Bit-Fields */
46 #define S3C_PCM_CLKCTL_SERCLK_EN (0x1 << 19)
47 #define S3C_PCM_CLKCTL_SERCLKSEL_PCLK (0x1 << 18)
48 #define S3C_PCM_CLKCTL_SCLKDIV_MASK 0x1ff
49 #define S3C_PCM_CLKCTL_SYNCDIV_MASK 0x1ff
50 #define S3C_PCM_CLKCTL_SCLKDIV_SHIFT 9
51 #define S3C_PCM_CLKCTL_SYNCDIV_SHIFT 0
53 /* PCM_TXFIFO Bit-Fields */
54 #define S3C_PCM_TXFIFO_DVALID (0x1 << 16)
55 #define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0)
57 /* PCM_RXFIFO Bit-Fields */
58 #define S3C_PCM_RXFIFO_DVALID (0x1 << 16)
59 #define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0)
61 /* PCM_IRQCTL Bit-Fields */
62 #define S3C_PCM_IRQCTL_IRQEN (0x1 << 14)
63 #define S3C_PCM_IRQCTL_WRDEN (0x1 << 12)
64 #define S3C_PCM_IRQCTL_TXEMPTYEN (0x1 << 11)
65 #define S3C_PCM_IRQCTL_TXALMSTEMPTYEN (0x1 << 10)
66 #define S3C_PCM_IRQCTL_TXFULLEN (0x1 << 9)
67 #define S3C_PCM_IRQCTL_TXALMSTFULLEN (0x1 << 8)
68 #define S3C_PCM_IRQCTL_TXSTARVEN (0x1 << 7)
69 #define S3C_PCM_IRQCTL_TXERROVRFLEN (0x1 << 6)
70 #define S3C_PCM_IRQCTL_RXEMPTEN (0x1 << 5)
71 #define S3C_PCM_IRQCTL_RXALMSTEMPTEN (0x1 << 4)
72 #define S3C_PCM_IRQCTL_RXFULLEN (0x1 << 3)
73 #define S3C_PCM_IRQCTL_RXALMSTFULLEN (0x1 << 2)
74 #define S3C_PCM_IRQCTL_RXSTARVEN (0x1 << 1)
75 #define S3C_PCM_IRQCTL_RXERROVRFLEN (0x1 << 0)
77 /* PCM_IRQSTAT Bit-Fields */
78 #define S3C_PCM_IRQSTAT_IRQPND (0x1 << 13)
79 #define S3C_PCM_IRQSTAT_WRD_XFER (0x1 << 12)
80 #define S3C_PCM_IRQSTAT_TXEMPTY (0x1 << 11)
81 #define S3C_PCM_IRQSTAT_TXALMSTEMPTY (0x1 << 10)
82 #define S3C_PCM_IRQSTAT_TXFULL (0x1 << 9)
83 #define S3C_PCM_IRQSTAT_TXALMSTFULL (0x1 << 8)
84 #define S3C_PCM_IRQSTAT_TXSTARV (0x1 << 7)
85 #define S3C_PCM_IRQSTAT_TXERROVRFL (0x1 << 6)
86 #define S3C_PCM_IRQSTAT_RXEMPT (0x1 << 5)
87 #define S3C_PCM_IRQSTAT_RXALMSTEMPT (0x1 << 4)
88 #define S3C_PCM_IRQSTAT_RXFULL (0x1 << 3)
89 #define S3C_PCM_IRQSTAT_RXALMSTFULL (0x1 << 2)
90 #define S3C_PCM_IRQSTAT_RXSTARV (0x1 << 1)
91 #define S3C_PCM_IRQSTAT_RXERROVRFL (0x1 << 0)
93 /* PCM_FIFOSTAT Bit-Fields */
94 #define S3C_PCM_FIFOSTAT_TXCNT_MSK (0x3f << 14)
95 #define S3C_PCM_FIFOSTAT_TXFIFOEMPTY (0x1 << 13)
96 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY (0x1 << 12)
97 #define S3C_PCM_FIFOSTAT_TXFIFOFULL (0x1 << 11)
98 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL (0x1 << 10)
99 #define S3C_PCM_FIFOSTAT_RXCNT_MSK (0x3f << 4)
100 #define S3C_PCM_FIFOSTAT_RXFIFOEMPTY (0x1 << 3)
101 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY (0x1 << 2)
102 #define S3C_PCM_FIFOSTAT_RXFIFOFULL (0x1 << 1)
103 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL (0x1 << 0)
106 * struct s3c_pcm_info - S3C PCM Controller information
108 * @dev: The parent device passed to use from the probe.
109 * @regs: The pointer to the device register block.
110 * @sclk_per_fs: number of sclk per frame sync
111 * @idleclk: Whether to keep PCMSCLK enabled even when idle (no active xfer)
112 * @pclk: the PCLK_PCM (pcm) clock pointer
113 * @cclk: the SCLK_AUDIO (audio-bus) clock pointer
114 * @dma_playback: DMA information for playback channel.
115 * @dma_capture: DMA information for capture channel.
117 struct s3c_pcm_info {
122 unsigned int sclk_per_fs;
124 /* Whether to keep PCMSCLK enabled even when idle(no active xfer) */
125 unsigned int idleclk;
130 struct snd_dmaengine_dai_dma_data *dma_playback;
131 struct snd_dmaengine_dai_dma_data *dma_capture;
134 static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_out[] = {
143 static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_in[] = {
152 static struct s3c_pcm_info s3c_pcm[2];
154 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
156 void __iomem *regs = pcm->regs;
159 clkctl = readl(regs + S3C_PCM_CLKCTL);
160 ctl = readl(regs + S3C_PCM_CTL);
161 ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
162 << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
165 ctl |= S3C_PCM_CTL_TXDMA_EN;
166 ctl |= S3C_PCM_CTL_TXFIFO_EN;
167 ctl |= S3C_PCM_CTL_ENABLE;
168 ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
169 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
171 ctl &= ~S3C_PCM_CTL_TXDMA_EN;
172 ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
174 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
175 ctl &= ~S3C_PCM_CTL_ENABLE;
177 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
181 writel(clkctl, regs + S3C_PCM_CLKCTL);
182 writel(ctl, regs + S3C_PCM_CTL);
185 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
187 void __iomem *regs = pcm->regs;
190 ctl = readl(regs + S3C_PCM_CTL);
191 clkctl = readl(regs + S3C_PCM_CLKCTL);
192 ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK
193 << S3C_PCM_CTL_RXDIPSTICK_SHIFT);
196 ctl |= S3C_PCM_CTL_RXDMA_EN;
197 ctl |= S3C_PCM_CTL_RXFIFO_EN;
198 ctl |= S3C_PCM_CTL_ENABLE;
199 ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT);
200 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
202 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
203 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
205 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
206 ctl &= ~S3C_PCM_CTL_ENABLE;
208 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
212 writel(clkctl, regs + S3C_PCM_CLKCTL);
213 writel(ctl, regs + S3C_PCM_CTL);
216 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
217 struct snd_soc_dai *dai)
219 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
220 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
223 dev_dbg(pcm->dev, "Entered %s\n", __func__);
226 case SNDRV_PCM_TRIGGER_START:
227 case SNDRV_PCM_TRIGGER_RESUME:
228 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
229 spin_lock_irqsave(&pcm->lock, flags);
231 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
232 s3c_pcm_snd_rxctrl(pcm, 1);
234 s3c_pcm_snd_txctrl(pcm, 1);
236 spin_unlock_irqrestore(&pcm->lock, flags);
239 case SNDRV_PCM_TRIGGER_STOP:
240 case SNDRV_PCM_TRIGGER_SUSPEND:
241 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
242 spin_lock_irqsave(&pcm->lock, flags);
244 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
245 s3c_pcm_snd_rxctrl(pcm, 0);
247 s3c_pcm_snd_txctrl(pcm, 0);
249 spin_unlock_irqrestore(&pcm->lock, flags);
259 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
260 struct snd_pcm_hw_params *params,
261 struct snd_soc_dai *socdai)
263 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
264 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
265 void __iomem *regs = pcm->regs;
267 int sclk_div, sync_div;
271 dev_dbg(pcm->dev, "Entered %s\n", __func__);
273 /* Strictly check for sample size */
274 switch (params_width(params)) {
281 spin_lock_irqsave(&pcm->lock, flags);
283 /* Get hold of the PCMSOURCE_CLK */
284 clkctl = readl(regs + S3C_PCM_CLKCTL);
285 if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
290 /* Set the SCLK divider */
291 sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
292 params_rate(params) / 2 - 1;
294 clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
295 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
296 clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
297 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
299 /* Set the SYNC divider */
300 sync_div = pcm->sclk_per_fs - 1;
302 clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
303 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
304 clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
305 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
307 writel(clkctl, regs + S3C_PCM_CLKCTL);
309 spin_unlock_irqrestore(&pcm->lock, flags);
311 dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
312 clk_get_rate(clk), pcm->sclk_per_fs,
318 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
321 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
322 void __iomem *regs = pcm->regs;
327 dev_dbg(pcm->dev, "Entered %s\n", __func__);
329 spin_lock_irqsave(&pcm->lock, flags);
331 ctl = readl(regs + S3C_PCM_CTL);
333 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
334 case SND_SOC_DAIFMT_IB_NF:
335 /* Nothing to do, IB_NF by default */
338 dev_err(pcm->dev, "Unsupported clock inversion!\n");
343 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
344 case SND_SOC_DAIFMT_CBS_CFS:
345 /* Nothing to do, Master by default */
348 dev_err(pcm->dev, "Unsupported master/slave format!\n");
353 switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
354 case SND_SOC_DAIFMT_CONT:
357 case SND_SOC_DAIFMT_GATED:
361 dev_err(pcm->dev, "Invalid Clock gating request!\n");
366 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
367 case SND_SOC_DAIFMT_DSP_A:
368 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
369 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
371 case SND_SOC_DAIFMT_DSP_B:
372 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
373 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
376 dev_err(pcm->dev, "Unsupported data format!\n");
381 writel(ctl, regs + S3C_PCM_CTL);
384 spin_unlock_irqrestore(&pcm->lock, flags);
389 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
392 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
395 case S3C_PCM_SCLK_PER_FS:
396 pcm->sclk_per_fs = div;
406 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
407 int clk_id, unsigned int freq, int dir)
409 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
410 void __iomem *regs = pcm->regs;
411 u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
414 case S3C_PCM_CLKSRC_PCLK:
415 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
418 case S3C_PCM_CLKSRC_MUX:
419 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
421 if (clk_get_rate(pcm->cclk) != freq)
422 clk_set_rate(pcm->cclk, freq);
430 writel(clkctl, regs + S3C_PCM_CLKCTL);
435 static const struct snd_soc_dai_ops s3c_pcm_dai_ops = {
436 .set_sysclk = s3c_pcm_set_sysclk,
437 .set_clkdiv = s3c_pcm_set_clkdiv,
438 .trigger = s3c_pcm_trigger,
439 .hw_params = s3c_pcm_hw_params,
440 .set_fmt = s3c_pcm_set_fmt,
443 static int s3c_pcm_dai_probe(struct snd_soc_dai *dai)
445 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(dai);
447 snd_soc_dai_init_dma_data(dai, pcm->dma_playback, pcm->dma_capture);
452 #define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000
454 #define S3C_PCM_DAI_DECLARE \
455 .symmetric_rate = 1, \
456 .probe = s3c_pcm_dai_probe, \
457 .ops = &s3c_pcm_dai_ops, \
461 .rates = S3C_PCM_RATES, \
462 .formats = SNDRV_PCM_FMTBIT_S16_LE, \
467 .rates = S3C_PCM_RATES, \
468 .formats = SNDRV_PCM_FMTBIT_S16_LE, \
471 static struct snd_soc_dai_driver s3c_pcm_dai[] = {
473 .name = "samsung-pcm.0",
477 .name = "samsung-pcm.1",
482 static const struct snd_soc_component_driver s3c_pcm_component = {
486 static int s3c_pcm_dev_probe(struct platform_device *pdev)
488 struct s3c_pcm_info *pcm;
489 struct resource *mem_res;
490 struct s3c_audio_pdata *pcm_pdata;
491 dma_filter_fn filter;
494 /* Check for valid device index */
495 if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
496 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
500 pcm_pdata = pdev->dev.platform_data;
502 if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
503 dev_err(&pdev->dev, "Unable to configure gpio\n");
507 pcm = &s3c_pcm[pdev->id];
508 pcm->dev = &pdev->dev;
510 spin_lock_init(&pcm->lock);
512 /* Default is 128fs */
513 pcm->sclk_per_fs = 128;
515 pcm->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem_res);
516 if (IS_ERR(pcm->regs))
517 return PTR_ERR(pcm->regs);
519 pcm->cclk = devm_clk_get(&pdev->dev, "audio-bus");
520 if (IS_ERR(pcm->cclk)) {
521 dev_err(&pdev->dev, "failed to get audio-bus clock\n");
522 return PTR_ERR(pcm->cclk);
524 ret = clk_prepare_enable(pcm->cclk);
528 /* record our pcm structure for later use in the callbacks */
529 dev_set_drvdata(&pdev->dev, pcm);
531 pcm->pclk = devm_clk_get(&pdev->dev, "pcm");
532 if (IS_ERR(pcm->pclk)) {
533 dev_err(&pdev->dev, "failed to get pcm clock\n");
534 ret = PTR_ERR(pcm->pclk);
537 ret = clk_prepare_enable(pcm->pclk);
541 s3c_pcm_stereo_in[pdev->id].addr = mem_res->start + S3C_PCM_RXFIFO;
542 s3c_pcm_stereo_out[pdev->id].addr = mem_res->start + S3C_PCM_TXFIFO;
546 s3c_pcm_stereo_in[pdev->id].filter_data = pcm_pdata->dma_capture;
547 s3c_pcm_stereo_out[pdev->id].filter_data = pcm_pdata->dma_playback;
548 filter = pcm_pdata->dma_filter;
551 pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
552 pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
554 ret = samsung_asoc_dma_platform_register(&pdev->dev, filter,
557 dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
561 pm_runtime_enable(&pdev->dev);
563 ret = devm_snd_soc_register_component(&pdev->dev, &s3c_pcm_component,
564 &s3c_pcm_dai[pdev->id], 1);
566 dev_err(&pdev->dev, "failed to get register DAI: %d\n", ret);
573 pm_runtime_disable(&pdev->dev);
575 clk_disable_unprepare(pcm->pclk);
577 clk_disable_unprepare(pcm->cclk);
581 static int s3c_pcm_dev_remove(struct platform_device *pdev)
583 struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
585 pm_runtime_disable(&pdev->dev);
586 clk_disable_unprepare(pcm->cclk);
587 clk_disable_unprepare(pcm->pclk);
592 static struct platform_driver s3c_pcm_driver = {
593 .probe = s3c_pcm_dev_probe,
594 .remove = s3c_pcm_dev_remove,
596 .name = "samsung-pcm",
600 module_platform_driver(s3c_pcm_driver);
602 /* Module information */
603 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
604 MODULE_DESCRIPTION("S3C PCM Controller Driver");
605 MODULE_LICENSE("GPL");
606 MODULE_ALIAS("platform:samsung-pcm");