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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * linux/sound/soc/pxa/mmp-sspa.c
0004  * Base on pxa2xx-ssp.c
0005  *
0006  * Copyright (C) 2011 Marvell International Ltd.
0007  */
0008 #include <linux/init.h>
0009 #include <linux/module.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/delay.h>
0012 #include <linux/clk.h>
0013 #include <linux/slab.h>
0014 #include <linux/io.h>
0015 #include <linux/dmaengine.h>
0016 #include <linux/pm_runtime.h>
0017 
0018 #include <sound/core.h>
0019 #include <sound/pcm.h>
0020 #include <sound/initval.h>
0021 #include <sound/pcm_params.h>
0022 #include <sound/soc.h>
0023 #include <sound/pxa2xx-lib.h>
0024 #include <sound/dmaengine_pcm.h>
0025 #include "mmp-sspa.h"
0026 
0027 /*
0028  * SSPA audio private data
0029  */
0030 struct sspa_priv {
0031     void __iomem *tx_base;
0032     void __iomem *rx_base;
0033 
0034     struct snd_dmaengine_dai_dma_data playback_dma_data;
0035     struct snd_dmaengine_dai_dma_data capture_dma_data;
0036     struct clk *clk;
0037     struct clk *audio_clk;
0038     struct clk *sysclk;
0039 
0040     int running_cnt;
0041     u32 sp;
0042     u32 ctrl;
0043 };
0044 
0045 static void mmp_sspa_tx_enable(struct sspa_priv *sspa)
0046 {
0047     unsigned int sspa_sp = sspa->sp;
0048 
0049     sspa_sp &= ~SSPA_SP_MSL;
0050     sspa_sp |= SSPA_SP_S_EN;
0051     sspa_sp |= SSPA_SP_WEN;
0052     __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
0053 }
0054 
0055 static void mmp_sspa_tx_disable(struct sspa_priv *sspa)
0056 {
0057     unsigned int sspa_sp = sspa->sp;
0058 
0059     sspa_sp &= ~SSPA_SP_MSL;
0060     sspa_sp &= ~SSPA_SP_S_EN;
0061     sspa_sp |= SSPA_SP_WEN;
0062     __raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
0063 }
0064 
0065 static void mmp_sspa_rx_enable(struct sspa_priv *sspa)
0066 {
0067     unsigned int sspa_sp = sspa->sp;
0068 
0069     sspa_sp |= SSPA_SP_S_EN;
0070     sspa_sp |= SSPA_SP_WEN;
0071     __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
0072 }
0073 
0074 static void mmp_sspa_rx_disable(struct sspa_priv *sspa)
0075 {
0076     unsigned int sspa_sp = sspa->sp;
0077 
0078     sspa_sp &= ~SSPA_SP_S_EN;
0079     sspa_sp |= SSPA_SP_WEN;
0080     __raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
0081 }
0082 
0083 static int mmp_sspa_startup(struct snd_pcm_substream *substream,
0084     struct snd_soc_dai *dai)
0085 {
0086     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
0087 
0088     clk_prepare_enable(sspa->sysclk);
0089     clk_prepare_enable(sspa->clk);
0090 
0091     return 0;
0092 }
0093 
0094 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
0095     struct snd_soc_dai *dai)
0096 {
0097     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
0098 
0099     clk_disable_unprepare(sspa->clk);
0100     clk_disable_unprepare(sspa->sysclk);
0101 }
0102 
0103 /*
0104  * Set the SSP ports SYSCLK.
0105  */
0106 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
0107                     int clk_id, unsigned int freq, int dir)
0108 {
0109     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
0110     struct device *dev = cpu_dai->component->dev;
0111     int ret = 0;
0112 
0113     if (dev->of_node)
0114         return -ENOTSUPP;
0115 
0116     switch (clk_id) {
0117     case MMP_SSPA_CLK_AUDIO:
0118         ret = clk_set_rate(sspa->audio_clk, freq);
0119         if (ret)
0120             return ret;
0121         break;
0122     case MMP_SSPA_CLK_PLL:
0123     case MMP_SSPA_CLK_VCXO:
0124         /* not support yet */
0125         return -EINVAL;
0126     default:
0127         return -EINVAL;
0128     }
0129 
0130     return 0;
0131 }
0132 
0133 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
0134                  int source, unsigned int freq_in,
0135                  unsigned int freq_out)
0136 {
0137     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
0138     struct device *dev = cpu_dai->component->dev;
0139     int ret = 0;
0140 
0141     if (dev->of_node)
0142         return -ENOTSUPP;
0143 
0144     switch (pll_id) {
0145     case MMP_SYSCLK:
0146         ret = clk_set_rate(sspa->sysclk, freq_out);
0147         if (ret)
0148             return ret;
0149         break;
0150     case MMP_SSPA_CLK:
0151         ret = clk_set_rate(sspa->clk, freq_out);
0152         if (ret)
0153             return ret;
0154         break;
0155     default:
0156         return -ENODEV;
0157     }
0158 
0159     return 0;
0160 }
0161 
0162 /*
0163  * Set up the sspa dai format.
0164  */
0165 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
0166                  unsigned int fmt)
0167 {
0168     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
0169 
0170     /* reset port settings */
0171     sspa->sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
0172     sspa->ctrl = 0;
0173 
0174     switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
0175     case SND_SOC_DAIFMT_BP_FP:
0176         sspa->sp |= SSPA_SP_MSL;
0177         break;
0178     case SND_SOC_DAIFMT_BC_FC:
0179         break;
0180     default:
0181         return -EINVAL;
0182     }
0183 
0184     switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
0185     case SND_SOC_DAIFMT_NB_NF:
0186         sspa->sp |= SSPA_SP_FSP;
0187         break;
0188     default:
0189         return -EINVAL;
0190     }
0191 
0192     switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
0193     case SND_SOC_DAIFMT_I2S:
0194         sspa->ctrl |= SSPA_CTL_XDATDLY(1);
0195         break;
0196     default:
0197         return -EINVAL;
0198     }
0199 
0200     /* Since we are configuring the timings for the format by hand
0201      * we have to defer some things until hw_params() where we
0202      * know parameters like the sample size.
0203      */
0204     return 0;
0205 }
0206 
0207 /*
0208  * Set the SSPA audio DMA parameters and sample size.
0209  * Can be called multiple times by oss emulation.
0210  */
0211 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
0212                    struct snd_pcm_hw_params *params,
0213                    struct snd_soc_dai *dai)
0214 {
0215     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
0216     struct device *dev = dai->component->dev;
0217     u32 sspa_ctrl = sspa->ctrl;
0218     int bits;
0219     int bitval;
0220 
0221     switch (params_format(params)) {
0222     case SNDRV_PCM_FORMAT_S8:
0223         bits = 8;
0224         bitval = SSPA_CTL_8_BITS;
0225         break;
0226     case SNDRV_PCM_FORMAT_S16_LE:
0227         bits = 16;
0228         bitval = SSPA_CTL_16_BITS;
0229         break;
0230     case SNDRV_PCM_FORMAT_S24_3LE:
0231         bits = 24;
0232         bitval = SSPA_CTL_24_BITS;
0233         break;
0234     case SNDRV_PCM_FORMAT_S32_LE:
0235         bits = 32;
0236         bitval = SSPA_CTL_32_BITS;
0237         break;
0238     default:
0239         return -EINVAL;
0240     }
0241 
0242     sspa_ctrl &= ~SSPA_CTL_XPH;
0243     if (dev->of_node || params_channels(params) == 2)
0244         sspa_ctrl |= SSPA_CTL_XPH;
0245 
0246     sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
0247     sspa_ctrl |= SSPA_CTL_XWDLEN1(bitval);
0248 
0249     sspa_ctrl &= ~SSPA_CTL_XWDLEN2_MASK;
0250     sspa_ctrl |= SSPA_CTL_XWDLEN2(bitval);
0251 
0252     sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
0253     sspa_ctrl |= SSPA_CTL_XSSZ1(bitval);
0254 
0255     sspa_ctrl &= ~SSPA_CTL_XSSZ2_MASK;
0256     sspa_ctrl |= SSPA_CTL_XSSZ2(bitval);
0257 
0258     sspa->sp &= ~SSPA_SP_FWID_MASK;
0259     sspa->sp |= SSPA_SP_FWID(bits - 1);
0260 
0261     sspa->sp &= ~SSPA_TXSP_FPER_MASK;
0262     sspa->sp |= SSPA_TXSP_FPER(bits * 2 - 1);
0263 
0264     if (dev->of_node) {
0265         clk_set_rate(sspa->clk, params_rate(params) *
0266                     params_channels(params) * bits);
0267     }
0268 
0269     if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
0270         __raw_writel(sspa_ctrl, sspa->tx_base + SSPA_CTL);
0271         __raw_writel(0x1, sspa->tx_base + SSPA_FIFO_UL);
0272     } else {
0273         __raw_writel(sspa_ctrl, sspa->rx_base + SSPA_CTL);
0274         __raw_writel(0x0, sspa->rx_base + SSPA_FIFO_UL);
0275     }
0276 
0277     return 0;
0278 }
0279 
0280 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
0281                  struct snd_soc_dai *dai)
0282 {
0283     struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
0284     int ret = 0;
0285 
0286     switch (cmd) {
0287     case SNDRV_PCM_TRIGGER_START:
0288     case SNDRV_PCM_TRIGGER_RESUME:
0289     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
0290         /*
0291          * whatever playback or capture, must enable rx.
0292          * this is a hw issue, so need check if rx has been
0293          * enabled or not; if has been enabled by another
0294          * stream, do not enable again.
0295          */
0296         if (!sspa->running_cnt)
0297             mmp_sspa_rx_enable(sspa);
0298 
0299         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
0300             mmp_sspa_tx_enable(sspa);
0301 
0302         sspa->running_cnt++;
0303         break;
0304 
0305     case SNDRV_PCM_TRIGGER_STOP:
0306     case SNDRV_PCM_TRIGGER_SUSPEND:
0307     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
0308         sspa->running_cnt--;
0309 
0310         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
0311             mmp_sspa_tx_disable(sspa);
0312 
0313         /* have no capture stream, disable rx port */
0314         if (!sspa->running_cnt)
0315             mmp_sspa_rx_disable(sspa);
0316         break;
0317 
0318     default:
0319         ret = -EINVAL;
0320     }
0321 
0322     return ret;
0323 }
0324 
0325 static int mmp_sspa_probe(struct snd_soc_dai *dai)
0326 {
0327     struct sspa_priv *sspa = dev_get_drvdata(dai->dev);
0328 
0329     snd_soc_dai_init_dma_data(dai,
0330                 &sspa->playback_dma_data,
0331                 &sspa->capture_dma_data);
0332 
0333     return 0;
0334 }
0335 
0336 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
0337 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
0338         SNDRV_PCM_FMTBIT_S16_LE | \
0339         SNDRV_PCM_FMTBIT_S24_3LE | \
0340         SNDRV_PCM_FMTBIT_S32_LE)
0341 
0342 static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
0343     .startup    = mmp_sspa_startup,
0344     .shutdown   = mmp_sspa_shutdown,
0345     .trigger    = mmp_sspa_trigger,
0346     .hw_params  = mmp_sspa_hw_params,
0347     .set_sysclk = mmp_sspa_set_dai_sysclk,
0348     .set_pll    = mmp_sspa_set_dai_pll,
0349     .set_fmt    = mmp_sspa_set_dai_fmt,
0350 };
0351 
0352 static struct snd_soc_dai_driver mmp_sspa_dai = {
0353     .probe = mmp_sspa_probe,
0354     .playback = {
0355         .channels_min = 1,
0356         .channels_max = 128,
0357         .rates = MMP_SSPA_RATES,
0358         .formats = MMP_SSPA_FORMATS,
0359     },
0360     .capture = {
0361         .channels_min = 1,
0362         .channels_max = 2,
0363         .rates = MMP_SSPA_RATES,
0364         .formats = MMP_SSPA_FORMATS,
0365     },
0366     .ops = &mmp_sspa_dai_ops,
0367 };
0368 
0369 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
0370         SNDRV_PCM_INFO_MMAP_VALID | \
0371         SNDRV_PCM_INFO_INTERLEAVED |    \
0372         SNDRV_PCM_INFO_PAUSE |      \
0373         SNDRV_PCM_INFO_RESUME |     \
0374         SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
0375 
0376 static const struct snd_pcm_hardware mmp_pcm_hardware[] = {
0377     {
0378         .info           = MMP_PCM_INFO,
0379         .period_bytes_min   = 1024,
0380         .period_bytes_max   = 2048,
0381         .periods_min        = 2,
0382         .periods_max        = 32,
0383         .buffer_bytes_max   = 4096,
0384         .fifo_size      = 32,
0385     },
0386     {
0387         .info           = MMP_PCM_INFO,
0388         .period_bytes_min   = 1024,
0389         .period_bytes_max   = 2048,
0390         .periods_min        = 2,
0391         .periods_max        = 32,
0392         .buffer_bytes_max   = 4096,
0393         .fifo_size      = 32,
0394     },
0395 };
0396 
0397 static const struct snd_dmaengine_pcm_config mmp_pcm_config = {
0398     .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
0399     .pcm_hardware = mmp_pcm_hardware,
0400     .prealloc_buffer_size = 4096,
0401 };
0402 
0403 static int mmp_pcm_mmap(struct snd_soc_component *component,
0404             struct snd_pcm_substream *substream,
0405             struct vm_area_struct *vma)
0406 {
0407     vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
0408     vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
0409     return remap_pfn_range(vma, vma->vm_start,
0410         substream->dma_buffer.addr >> PAGE_SHIFT,
0411         vma->vm_end - vma->vm_start, vma->vm_page_prot);
0412 }
0413 
0414 static int mmp_sspa_open(struct snd_soc_component *component,
0415              struct snd_pcm_substream *substream)
0416 {
0417     struct sspa_priv *sspa = snd_soc_component_get_drvdata(component);
0418 
0419     pm_runtime_get_sync(component->dev);
0420 
0421     /* we can only change the settings if the port is not in use */
0422     if ((__raw_readl(sspa->tx_base + SSPA_SP) & SSPA_SP_S_EN) ||
0423         (__raw_readl(sspa->rx_base + SSPA_SP) & SSPA_SP_S_EN)) {
0424         dev_err(component->dev,
0425             "can't change hardware dai format: stream is in use\n");
0426         return -EBUSY;
0427     }
0428 
0429     __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
0430     __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
0431 
0432     sspa->sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
0433     __raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
0434     __raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
0435 
0436     /*
0437      * FIXME: hw issue, for the tx serial port,
0438      * can not config the master/slave mode;
0439      * so must clean this bit.
0440      * The master/slave mode has been set in the
0441      * rx port.
0442      */
0443     __raw_writel(sspa->sp & ~SSPA_SP_MSL, sspa->tx_base + SSPA_SP);
0444 
0445     __raw_writel(sspa->ctrl, sspa->tx_base + SSPA_CTL);
0446     __raw_writel(sspa->ctrl, sspa->rx_base + SSPA_CTL);
0447 
0448     return 0;
0449 }
0450 
0451 static int mmp_sspa_close(struct snd_soc_component *component,
0452               struct snd_pcm_substream *substream)
0453 {
0454     pm_runtime_put_sync(component->dev);
0455     return 0;
0456 }
0457 
0458 static const struct snd_soc_component_driver mmp_sspa_component = {
0459     .name           = "mmp-sspa",
0460     .mmap           = mmp_pcm_mmap,
0461     .open           = mmp_sspa_open,
0462     .close          = mmp_sspa_close,
0463     .legacy_dai_naming  = 1,
0464 };
0465 
0466 static int asoc_mmp_sspa_probe(struct platform_device *pdev)
0467 {
0468     struct sspa_priv *sspa;
0469     int ret;
0470 
0471     sspa = devm_kzalloc(&pdev->dev,
0472                 sizeof(struct sspa_priv), GFP_KERNEL);
0473     if (!sspa)
0474         return -ENOMEM;
0475 
0476     if (pdev->dev.of_node) {
0477         sspa->rx_base = devm_platform_ioremap_resource(pdev, 0);
0478         if (IS_ERR(sspa->rx_base))
0479             return PTR_ERR(sspa->rx_base);
0480 
0481         sspa->tx_base = devm_platform_ioremap_resource(pdev, 1);
0482         if (IS_ERR(sspa->tx_base))
0483             return PTR_ERR(sspa->tx_base);
0484 
0485         sspa->clk = devm_clk_get(&pdev->dev, "bitclk");
0486         if (IS_ERR(sspa->clk))
0487             return PTR_ERR(sspa->clk);
0488 
0489         sspa->audio_clk = devm_clk_get(&pdev->dev, "audio");
0490         if (IS_ERR(sspa->audio_clk))
0491             return PTR_ERR(sspa->audio_clk);
0492     } else {
0493         struct resource *res;
0494 
0495         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
0496         if (res == NULL)
0497             return -ENODEV;
0498 
0499         sspa->rx_base = devm_ioremap(&pdev->dev, res->start, 0x30);
0500         if (!sspa->rx_base)
0501             return -ENOMEM;
0502 
0503         sspa->tx_base = devm_ioremap(&pdev->dev,
0504                          res->start + 0x80, 0x30);
0505         if (!sspa->tx_base)
0506             return -ENOMEM;
0507 
0508         sspa->clk = devm_clk_get(&pdev->dev, NULL);
0509         if (IS_ERR(sspa->clk))
0510             return PTR_ERR(sspa->clk);
0511 
0512         sspa->audio_clk = clk_get(NULL, "mmp-audio");
0513         if (IS_ERR(sspa->audio_clk))
0514             return PTR_ERR(sspa->audio_clk);
0515 
0516         sspa->sysclk = clk_get(NULL, "mmp-sysclk");
0517         if (IS_ERR(sspa->sysclk)) {
0518             clk_put(sspa->audio_clk);
0519             return PTR_ERR(sspa->sysclk);
0520         }
0521     }
0522     platform_set_drvdata(pdev, sspa);
0523 
0524     sspa->playback_dma_data.maxburst = 4;
0525     sspa->capture_dma_data.maxburst = 4;
0526     /* You know, these addresses are actually ignored. */
0527     sspa->capture_dma_data.addr = SSPA_D;
0528     sspa->playback_dma_data.addr = 0x80 + SSPA_D;
0529 
0530     if (pdev->dev.of_node) {
0531         ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
0532                               &mmp_pcm_config, 0);
0533         if (ret)
0534             return ret;
0535     }
0536 
0537     ret = devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
0538                           &mmp_sspa_dai, 1);
0539     if (ret)
0540         return ret;
0541 
0542     pm_runtime_enable(&pdev->dev);
0543     clk_prepare_enable(sspa->audio_clk);
0544 
0545     return 0;
0546 }
0547 
0548 static int asoc_mmp_sspa_remove(struct platform_device *pdev)
0549 {
0550     struct sspa_priv *sspa = platform_get_drvdata(pdev);
0551 
0552     clk_disable_unprepare(sspa->audio_clk);
0553     pm_runtime_disable(&pdev->dev);
0554 
0555     if (pdev->dev.of_node)
0556         return 0;
0557 
0558     clk_put(sspa->audio_clk);
0559     clk_put(sspa->sysclk);
0560     return 0;
0561 }
0562 
0563 #ifdef CONFIG_OF
0564 static const struct of_device_id mmp_sspa_of_match[] = {
0565     { .compatible = "marvell,mmp-sspa" },
0566     {},
0567 };
0568 
0569 MODULE_DEVICE_TABLE(of, mmp_sspa_of_match);
0570 #endif
0571 
0572 static struct platform_driver asoc_mmp_sspa_driver = {
0573     .driver = {
0574         .name = "mmp-sspa-dai",
0575         .of_match_table = of_match_ptr(mmp_sspa_of_match),
0576     },
0577     .probe = asoc_mmp_sspa_probe,
0578     .remove = asoc_mmp_sspa_remove,
0579 };
0580 
0581 module_platform_driver(asoc_mmp_sspa_driver);
0582 
0583 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
0584 MODULE_DESCRIPTION("MMP SSPA SoC Interface");
0585 MODULE_LICENSE("GPL");
0586 MODULE_ALIAS("platform:mmp-sspa-dai");
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