/* sound/soc/samsung/pcm.c * * ALSA SoC Audio Layer - S3C PCM-Controller driver * * Copyright (c) 2009 Samsung Electronics Co. Ltd * Author: Jaswinder Singh <jassisinghbrar@gmail.com> * based upon I2S drivers by Ben Dooks. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pm_runtime.h> #include <sound/soc.h> #include <sound/pcm_params.h> #include <linux/platform_data/asoc-s3c.h> #include "dma.h" #include "pcm.h" /*Register Offsets */ #define S3C_PCM_CTL 0x00 #define S3C_PCM_CLKCTL 0x04 #define S3C_PCM_TXFIFO 0x08 #define S3C_PCM_RXFIFO 0x0C #define S3C_PCM_IRQCTL 0x10 #define S3C_PCM_IRQSTAT 0x14 #define S3C_PCM_FIFOSTAT 0x18 #define S3C_PCM_CLRINT 0x20 /* PCM_CTL Bit-Fields */ #define S3C_PCM_CTL_TXDIPSTICK_MASK 0x3f #define S3C_PCM_CTL_TXDIPSTICK_SHIFT 13 #define S3C_PCM_CTL_RXDIPSTICK_MASK 0x3f #define S3C_PCM_CTL_RXDIPSTICK_SHIFT 7 #define S3C_PCM_CTL_TXDMA_EN (0x1 << 6) #define S3C_PCM_CTL_RXDMA_EN (0x1 << 5) #define S3C_PCM_CTL_TXMSB_AFTER_FSYNC (0x1 << 4) #define S3C_PCM_CTL_RXMSB_AFTER_FSYNC (0x1 << 3) #define S3C_PCM_CTL_TXFIFO_EN (0x1 << 2) #define S3C_PCM_CTL_RXFIFO_EN (0x1 << 1) #define S3C_PCM_CTL_ENABLE (0x1 << 0) /* PCM_CLKCTL Bit-Fields */ #define S3C_PCM_CLKCTL_SERCLK_EN (0x1 << 19) #define S3C_PCM_CLKCTL_SERCLKSEL_PCLK (0x1 << 18) #define S3C_PCM_CLKCTL_SCLKDIV_MASK 0x1ff #define S3C_PCM_CLKCTL_SYNCDIV_MASK 0x1ff #define S3C_PCM_CLKCTL_SCLKDIV_SHIFT 9 #define S3C_PCM_CLKCTL_SYNCDIV_SHIFT 0 /* PCM_TXFIFO Bit-Fields */ #define S3C_PCM_TXFIFO_DVALID (0x1 << 16) #define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0) /* PCM_RXFIFO Bit-Fields */ #define S3C_PCM_RXFIFO_DVALID (0x1 << 16) #define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0) /* PCM_IRQCTL Bit-Fields */ #define S3C_PCM_IRQCTL_IRQEN (0x1 << 14) #define S3C_PCM_IRQCTL_WRDEN (0x1 << 12) #define S3C_PCM_IRQCTL_TXEMPTYEN (0x1 << 11) #define S3C_PCM_IRQCTL_TXALMSTEMPTYEN (0x1 << 10) #define S3C_PCM_IRQCTL_TXFULLEN (0x1 << 9) #define S3C_PCM_IRQCTL_TXALMSTFULLEN (0x1 << 8) #define S3C_PCM_IRQCTL_TXSTARVEN (0x1 << 7) #define S3C_PCM_IRQCTL_TXERROVRFLEN (0x1 << 6) #define S3C_PCM_IRQCTL_RXEMPTEN (0x1 << 5) #define S3C_PCM_IRQCTL_RXALMSTEMPTEN (0x1 << 4) #define S3C_PCM_IRQCTL_RXFULLEN (0x1 << 3) #define S3C_PCM_IRQCTL_RXALMSTFULLEN (0x1 << 2) #define S3C_PCM_IRQCTL_RXSTARVEN (0x1 << 1) #define S3C_PCM_IRQCTL_RXERROVRFLEN (0x1 << 0) /* PCM_IRQSTAT Bit-Fields */ #define S3C_PCM_IRQSTAT_IRQPND (0x1 << 13) #define S3C_PCM_IRQSTAT_WRD_XFER (0x1 << 12) #define S3C_PCM_IRQSTAT_TXEMPTY (0x1 << 11) #define S3C_PCM_IRQSTAT_TXALMSTEMPTY (0x1 << 10) #define S3C_PCM_IRQSTAT_TXFULL (0x1 << 9) #define S3C_PCM_IRQSTAT_TXALMSTFULL (0x1 << 8) #define S3C_PCM_IRQSTAT_TXSTARV (0x1 << 7) #define S3C_PCM_IRQSTAT_TXERROVRFL (0x1 << 6) #define S3C_PCM_IRQSTAT_RXEMPT (0x1 << 5) #define S3C_PCM_IRQSTAT_RXALMSTEMPT (0x1 << 4) #define S3C_PCM_IRQSTAT_RXFULL (0x1 << 3) #define S3C_PCM_IRQSTAT_RXALMSTFULL (0x1 << 2) #define S3C_PCM_IRQSTAT_RXSTARV (0x1 << 1) #define S3C_PCM_IRQSTAT_RXERROVRFL (0x1 << 0) /* PCM_FIFOSTAT Bit-Fields */ #define S3C_PCM_FIFOSTAT_TXCNT_MSK (0x3f << 14) #define S3C_PCM_FIFOSTAT_TXFIFOEMPTY (0x1 << 13) #define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY (0x1 << 12) #define S3C_PCM_FIFOSTAT_TXFIFOFULL (0x1 << 11) #define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL (0x1 << 10) #define S3C_PCM_FIFOSTAT_RXCNT_MSK (0x3f << 4) #define S3C_PCM_FIFOSTAT_RXFIFOEMPTY (0x1 << 3) #define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY (0x1 << 2) #define S3C_PCM_FIFOSTAT_RXFIFOFULL (0x1 << 1) #define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL (0x1 << 0) /** * struct s3c_pcm_info - S3C PCM Controller information * @dev: The parent device passed to use from the probe. * @regs: The pointer to the device register block. * @dma_playback: DMA information for playback channel. * @dma_capture: DMA information for capture channel. */ struct s3c_pcm_info { spinlock_t lock; struct device *dev; void __iomem *regs; unsigned int sclk_per_fs; /* Whether to keep PCMSCLK enabled even when idle(no active xfer) */ unsigned int idleclk; struct clk *pclk; struct clk *cclk; struct s3c_dma_params *dma_playback; struct s3c_dma_params *dma_capture; }; static struct s3c_dma_params s3c_pcm_stereo_out[] = { [0] = { .dma_size = 4, }, [1] = { .dma_size = 4, }, }; static struct s3c_dma_params s3c_pcm_stereo_in[] = { [0] = { .dma_size = 4, }, [1] = { .dma_size = 4, }, }; static struct s3c_pcm_info s3c_pcm[2]; static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on) { void __iomem *regs = pcm->regs; u32 ctl, clkctl; clkctl = readl(regs + S3C_PCM_CLKCTL); ctl = readl(regs + S3C_PCM_CTL); ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK << S3C_PCM_CTL_TXDIPSTICK_SHIFT); if (on) { ctl |= S3C_PCM_CTL_TXDMA_EN; ctl |= S3C_PCM_CTL_TXFIFO_EN; ctl |= S3C_PCM_CTL_ENABLE; ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT); clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; } else { ctl &= ~S3C_PCM_CTL_TXDMA_EN; ctl &= ~S3C_PCM_CTL_TXFIFO_EN; if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) { ctl &= ~S3C_PCM_CTL_ENABLE; if (!pcm->idleclk) clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; } } writel(clkctl, regs + S3C_PCM_CLKCTL); writel(ctl, regs + S3C_PCM_CTL); } static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on) { void __iomem *regs = pcm->regs; u32 ctl, clkctl; ctl = readl(regs + S3C_PCM_CTL); clkctl = readl(regs + S3C_PCM_CLKCTL); ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK << S3C_PCM_CTL_RXDIPSTICK_SHIFT); if (on) { ctl |= S3C_PCM_CTL_RXDMA_EN; ctl |= S3C_PCM_CTL_RXFIFO_EN; ctl |= S3C_PCM_CTL_ENABLE; ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT); clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; } else { ctl &= ~S3C_PCM_CTL_RXDMA_EN; ctl &= ~S3C_PCM_CTL_RXFIFO_EN; if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) { ctl &= ~S3C_PCM_CTL_ENABLE; if (!pcm->idleclk) clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; } } writel(clkctl, regs + S3C_PCM_CLKCTL); writel(ctl, regs + S3C_PCM_CTL); } static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai); unsigned long flags; dev_dbg(pcm->dev, "Entered %s\n", __func__); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: spin_lock_irqsave(&pcm->lock, flags); if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) s3c_pcm_snd_rxctrl(pcm, 1); else s3c_pcm_snd_txctrl(pcm, 1); spin_unlock_irqrestore(&pcm->lock, flags); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: spin_lock_irqsave(&pcm->lock, flags); if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) s3c_pcm_snd_rxctrl(pcm, 0); else s3c_pcm_snd_txctrl(pcm, 0); spin_unlock_irqrestore(&pcm->lock, flags); break; default: return -EINVAL; } return 0; } static int s3c_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *socdai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai); void __iomem *regs = pcm->regs; struct clk *clk; int sclk_div, sync_div; unsigned long flags; u32 clkctl; dev_dbg(pcm->dev, "Entered %s\n", __func__); /* Strictly check for sample size */ switch (params_width(params)) { case 16: break; default: return -EINVAL; } spin_lock_irqsave(&pcm->lock, flags); /* Get hold of the PCMSOURCE_CLK */ clkctl = readl(regs + S3C_PCM_CLKCTL); if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK) clk = pcm->pclk; else clk = pcm->cclk; /* Set the SCLK divider */ sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs / params_rate(params) / 2 - 1; clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK) << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); /* Set the SYNC divider */ sync_div = pcm->sclk_per_fs - 1; clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK) << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); writel(clkctl, regs + S3C_PCM_CLKCTL); spin_unlock_irqrestore(&pcm->lock, flags); dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n", clk_get_rate(clk), pcm->sclk_per_fs, sclk_div, sync_div); return 0; } static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); void __iomem *regs = pcm->regs; unsigned long flags; int ret = 0; u32 ctl; dev_dbg(pcm->dev, "Entered %s\n", __func__); spin_lock_irqsave(&pcm->lock, flags); ctl = readl(regs + S3C_PCM_CTL); switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_IB_NF: /* Nothing to do, IB_NF by default */ break; default: dev_err(pcm->dev, "Unsupported clock inversion!\n"); ret = -EINVAL; goto exit; } switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: /* Nothing to do, Master by default */ break; default: dev_err(pcm->dev, "Unsupported master/slave format!\n"); ret = -EINVAL; goto exit; } switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) { case SND_SOC_DAIFMT_CONT: pcm->idleclk = 1; break; case SND_SOC_DAIFMT_GATED: pcm->idleclk = 0; break; default: dev_err(pcm->dev, "Invalid Clock gating request!\n"); ret = -EINVAL; goto exit; } switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_DSP_A: ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC; ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC; break; case SND_SOC_DAIFMT_DSP_B: ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC; ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC; break; default: dev_err(pcm->dev, "Unsupported data format!\n"); ret = -EINVAL; goto exit; } writel(ctl, regs + S3C_PCM_CTL); exit: spin_unlock_irqrestore(&pcm->lock, flags); return ret; } static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai, int div_id, int div) { struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); switch (div_id) { case S3C_PCM_SCLK_PER_FS: pcm->sclk_per_fs = div; break; default: return -EINVAL; } return 0; } static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); void __iomem *regs = pcm->regs; u32 clkctl = readl(regs + S3C_PCM_CLKCTL); switch (clk_id) { case S3C_PCM_CLKSRC_PCLK: clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK; break; case S3C_PCM_CLKSRC_MUX: clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK; if (clk_get_rate(pcm->cclk) != freq) clk_set_rate(pcm->cclk, freq); break; default: return -EINVAL; } writel(clkctl, regs + S3C_PCM_CLKCTL); return 0; } static const struct snd_soc_dai_ops s3c_pcm_dai_ops = { .set_sysclk = s3c_pcm_set_sysclk, .set_clkdiv = s3c_pcm_set_clkdiv, .trigger = s3c_pcm_trigger, .hw_params = s3c_pcm_hw_params, .set_fmt = s3c_pcm_set_fmt, }; static int s3c_pcm_dai_probe(struct snd_soc_dai *dai) { struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(dai); snd_soc_dai_init_dma_data(dai, pcm->dma_playback, pcm->dma_capture); return 0; } #define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000 #define S3C_PCM_DAI_DECLARE \ .symmetric_rates = 1, \ .probe = s3c_pcm_dai_probe, \ .ops = &s3c_pcm_dai_ops, \ .playback = { \ .channels_min = 2, \ .channels_max = 2, \ .rates = S3C_PCM_RATES, \ .formats = SNDRV_PCM_FMTBIT_S16_LE, \ }, \ .capture = { \ .channels_min = 2, \ .channels_max = 2, \ .rates = S3C_PCM_RATES, \ .formats = SNDRV_PCM_FMTBIT_S16_LE, \ } static struct snd_soc_dai_driver s3c_pcm_dai[] = { [0] = { .name = "samsung-pcm.0", S3C_PCM_DAI_DECLARE, }, [1] = { .name = "samsung-pcm.1", S3C_PCM_DAI_DECLARE, }, }; static const struct snd_soc_component_driver s3c_pcm_component = { .name = "s3c-pcm", }; static int s3c_pcm_dev_probe(struct platform_device *pdev) { struct s3c_pcm_info *pcm; struct resource *mem_res, *dmatx_res, *dmarx_res; struct s3c_audio_pdata *pcm_pdata; int ret; /* Check for valid device index */ if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) { dev_err(&pdev->dev, "id %d out of range\n", pdev->id); return -EINVAL; } pcm_pdata = pdev->dev.platform_data; /* Check for availability of necessary resource */ dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!dmatx_res) { dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n"); return -ENXIO; } dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!dmarx_res) { dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n"); return -ENXIO; } mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem_res) { dev_err(&pdev->dev, "Unable to get register resource\n"); return -ENXIO; } if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) { dev_err(&pdev->dev, "Unable to configure gpio\n"); return -EINVAL; } pcm = &s3c_pcm[pdev->id]; pcm->dev = &pdev->dev; spin_lock_init(&pcm->lock); /* Default is 128fs */ pcm->sclk_per_fs = 128; pcm->cclk = devm_clk_get(&pdev->dev, "audio-bus"); if (IS_ERR(pcm->cclk)) { dev_err(&pdev->dev, "failed to get audio-bus\n"); ret = PTR_ERR(pcm->cclk); goto err1; } clk_prepare_enable(pcm->cclk); /* record our pcm structure for later use in the callbacks */ dev_set_drvdata(&pdev->dev, pcm); if (!request_mem_region(mem_res->start, resource_size(mem_res), "samsung-pcm")) { dev_err(&pdev->dev, "Unable to request register region\n"); ret = -EBUSY; goto err2; } pcm->regs = ioremap(mem_res->start, 0x100); if (pcm->regs == NULL) { dev_err(&pdev->dev, "cannot ioremap registers\n"); ret = -ENXIO; goto err3; } pcm->pclk = devm_clk_get(&pdev->dev, "pcm"); if (IS_ERR(pcm->pclk)) { dev_err(&pdev->dev, "failed to get pcm_clock\n"); ret = -ENOENT; goto err4; } clk_prepare_enable(pcm->pclk); s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start + S3C_PCM_RXFIFO; s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start + S3C_PCM_TXFIFO; s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start; s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start; pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id]; pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id]; pm_runtime_enable(&pdev->dev); ret = devm_snd_soc_register_component(&pdev->dev, &s3c_pcm_component, &s3c_pcm_dai[pdev->id], 1); if (ret != 0) { dev_err(&pdev->dev, "failed to get register DAI: %d\n", ret); goto err5; } ret = samsung_asoc_dma_platform_register(&pdev->dev); if (ret) { dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret); goto err5; } return 0; err5: clk_disable_unprepare(pcm->pclk); err4: iounmap(pcm->regs); err3: release_mem_region(mem_res->start, resource_size(mem_res)); err2: clk_disable_unprepare(pcm->cclk); err1: return ret; } static int s3c_pcm_dev_remove(struct platform_device *pdev) { struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id]; struct resource *mem_res; pm_runtime_disable(&pdev->dev); iounmap(pcm->regs); mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(mem_res->start, resource_size(mem_res)); clk_disable_unprepare(pcm->cclk); clk_disable_unprepare(pcm->pclk); return 0; } static struct platform_driver s3c_pcm_driver = { .probe = s3c_pcm_dev_probe, .remove = s3c_pcm_dev_remove, .driver = { .name = "samsung-pcm", .owner = THIS_MODULE, }, }; module_platform_driver(s3c_pcm_driver); /* Module information */ MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>"); MODULE_DESCRIPTION("S3C PCM Controller Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:samsung-pcm");