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spdif.c

/* sound/soc/samsung/spdif.c
 *
 * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
 *
 * Copyright (c) 2010 Samsung Electronics Co. Ltd
 *          http://www.samsung.com/
 *
 * 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 <sound/soc.h>
#include <sound/pcm_params.h>

#include <plat/audio.h>
#include <mach/dma.h>

#include "dma.h"
#include "spdif.h"

/* Registers */
#define CLKCON                      0x00
#define CON                   0x04
#define BSTAS                       0x08
#define CSTAS                       0x0C
#define DATA_OUTBUF                 0x10
#define DCNT                        0x14
#define BSTAS_S                     0x18
#define DCNT_S                      0x1C

#define CLKCTL_MASK                 0x7
#define CLKCTL_MCLK_EXT             (0x1 << 2)
#define CLKCTL_PWR_ON               (0x1 << 0)

#define CON_MASK              0x3ffffff
#define CON_FIFO_TH_SHIFT           19
#define CON_FIFO_TH_MASK            (0x7 << 19)
#define CON_USERDATA_23RDBIT        (0x1 << 12)

#define CON_SW_RESET                (0x1 << 5)

#define CON_MCLKDIV_MASK            (0x3 << 3)
#define CON_MCLKDIV_256FS           (0x0 << 3)
#define CON_MCLKDIV_384FS           (0x1 << 3)
#define CON_MCLKDIV_512FS           (0x2 << 3)

#define CON_PCM_MASK                (0x3 << 1)
#define CON_PCM_16BIT               (0x0 << 1)
#define CON_PCM_20BIT               (0x1 << 1)
#define CON_PCM_24BIT               (0x2 << 1)

#define CON_PCM_DATA                (0x1 << 0)

#define CSTAS_MASK                  0x3fffffff
#define CSTAS_SAMP_FREQ_MASK        (0xF << 24)
#define CSTAS_SAMP_FREQ_44          (0x0 << 24)
#define CSTAS_SAMP_FREQ_48          (0x2 << 24)
#define CSTAS_SAMP_FREQ_32          (0x3 << 24)
#define CSTAS_SAMP_FREQ_96          (0xA << 24)

#define CSTAS_CATEGORY_MASK         (0xFF << 8)
#define CSTAS_CATEGORY_CODE_CDP           (0x01 << 8)

#define CSTAS_NO_COPYRIGHT          (0x1 << 2)

/**
 * struct samsung_spdif_info - Samsung S/PDIF Controller information
 * @lock: Spin lock for S/PDIF.
 * @dev: The parent device passed to use from the probe.
 * @regs: The pointer to the device register block.
 * @clk_rate: Current clock rate for calcurate ratio.
 * @pclk: The peri-clock pointer for spdif master operation.
 * @sclk: The source clock pointer for making sync signals.
 * @save_clkcon: Backup clkcon reg. in suspend.
 * @save_con: Backup con reg. in suspend.
 * @save_cstas: Backup cstas reg. in suspend.
 * @dma_playback: DMA information for playback channel.
 */
00083 struct samsung_spdif_info {
      spinlock_t  lock;
      struct device     *dev;
      void __iomem      *regs;
      unsigned long     clk_rate;
      struct clk  *pclk;
      struct clk  *sclk;
      u32         saved_clkcon;
      u32         saved_con;
      u32         saved_cstas;
      struct s3c_dma_params   *dma_playback;
};

static struct s3c2410_dma_client spdif_dma_client_out = {
      .name       = "S/PDIF Stereo out",
};

static struct s3c_dma_params spdif_stereo_out;
static struct samsung_spdif_info spdif_info;

static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
{
      return snd_soc_dai_get_drvdata(cpu_dai);
}

static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
{
      void __iomem *regs = spdif->regs;
      u32 clkcon;

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
      if (on)
            writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
      else
            writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}

static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
                        int clk_id, unsigned int freq, int dir)
{
      struct samsung_spdif_info *spdif = to_info(cpu_dai);
      u32 clkcon;

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      clkcon = readl(spdif->regs + CLKCON);

      if (clk_id == SND_SOC_SPDIF_INT_MCLK)
            clkcon &= ~CLKCTL_MCLK_EXT;
      else
            clkcon |= CLKCTL_MCLK_EXT;

      writel(clkcon, spdif->regs + CLKCON);

      spdif->clk_rate = freq;

      return 0;
}

static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
      unsigned long flags;

      dev_dbg(spdif->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(&spdif->lock, flags);
            spdif_snd_txctrl(spdif, 1);
            spin_unlock_irqrestore(&spdif->lock, flags);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            spin_lock_irqsave(&spdif->lock, flags);
            spdif_snd_txctrl(spdif, 0);
            spin_unlock_irqrestore(&spdif->lock, flags);
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

static int spdif_sysclk_ratios[] = {
      512, 384, 256,
};

static int spdif_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 samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
      void __iomem *regs = spdif->regs;
      struct s3c_dma_params *dma_data;
      u32 con, clkcon, cstas;
      unsigned long flags;
      int i, ratio;

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
            dma_data = spdif->dma_playback;
      else {
            dev_err(spdif->dev, "Capture is not supported\n");
            return -EINVAL;
      }

      snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);

      spin_lock_irqsave(&spdif->lock, flags);

      con = readl(regs + CON) & CON_MASK;
      cstas = readl(regs + CSTAS) & CSTAS_MASK;
      clkcon = readl(regs + CLKCON) & CLKCTL_MASK;

      con &= ~CON_FIFO_TH_MASK;
      con |= (0x7 << CON_FIFO_TH_SHIFT);
      con |= CON_USERDATA_23RDBIT;
      con |= CON_PCM_DATA;

      con &= ~CON_PCM_MASK;
      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            con |= CON_PCM_16BIT;
            break;
      default:
            dev_err(spdif->dev, "Unsupported data size.\n");
            goto err;
      }

      ratio = spdif->clk_rate / params_rate(params);
      for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
            if (ratio == spdif_sysclk_ratios[i])
                  break;
      if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
            dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
                        spdif->clk_rate, params_rate(params));
            goto err;
      }

      con &= ~CON_MCLKDIV_MASK;
      switch (ratio) {
      case 256:
            con |= CON_MCLKDIV_256FS;
            break;
      case 384:
            con |= CON_MCLKDIV_384FS;
            break;
      case 512:
            con |= CON_MCLKDIV_512FS;
            break;
      }

      cstas &= ~CSTAS_SAMP_FREQ_MASK;
      switch (params_rate(params)) {
      case 44100:
            cstas |= CSTAS_SAMP_FREQ_44;
            break;
      case 48000:
            cstas |= CSTAS_SAMP_FREQ_48;
            break;
      case 32000:
            cstas |= CSTAS_SAMP_FREQ_32;
            break;
      case 96000:
            cstas |= CSTAS_SAMP_FREQ_96;
            break;
      default:
            dev_err(spdif->dev, "Invalid sampling rate %d\n",
                        params_rate(params));
            goto err;
      }

      cstas &= ~CSTAS_CATEGORY_MASK;
      cstas |= CSTAS_CATEGORY_CODE_CDP;
      cstas |= CSTAS_NO_COPYRIGHT;

      writel(con, regs + CON);
      writel(cstas, regs + CSTAS);
      writel(clkcon, regs + CLKCON);

      spin_unlock_irqrestore(&spdif->lock, flags);

      return 0;
err:
      spin_unlock_irqrestore(&spdif->lock, flags);
      return -EINVAL;
}

static void spdif_shutdown(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
      void __iomem *regs = spdif->regs;
      u32 con, clkcon;

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      con = readl(regs + CON) & CON_MASK;
      clkcon = readl(regs + CLKCON) & CLKCTL_MASK;

      writel(con | CON_SW_RESET, regs + CON);
      cpu_relax();

      writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}

#ifdef CONFIG_PM
static int spdif_suspend(struct snd_soc_dai *cpu_dai)
{
      struct samsung_spdif_info *spdif = to_info(cpu_dai);
      u32 con = spdif->saved_con;

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      spdif->saved_clkcon = readl(spdif->regs   + CLKCON) & CLKCTL_MASK;
      spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
      spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;

      writel(con | CON_SW_RESET, spdif->regs + CON);
      cpu_relax();

      return 0;
}

static int spdif_resume(struct snd_soc_dai *cpu_dai)
{
      struct samsung_spdif_info *spdif = to_info(cpu_dai);

      dev_dbg(spdif->dev, "Entered %s\n", __func__);

      writel(spdif->saved_clkcon, spdif->regs   + CLKCON);
      writel(spdif->saved_con, spdif->regs + CON);
      writel(spdif->saved_cstas, spdif->regs + CSTAS);

      return 0;
}
#else
#define spdif_suspend NULL
#define spdif_resume NULL
#endif

static struct snd_soc_dai_ops spdif_dai_ops = {
      .set_sysclk = spdif_set_sysclk,
      .trigger    = spdif_trigger,
      .hw_params  = spdif_hw_params,
      .shutdown   = spdif_shutdown,
};

struct snd_soc_dai_driver samsung_spdif_dai = {
      .name = "samsung-spdif",
      .playback = {
            .stream_name = "S/PDIF Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = (SNDRV_PCM_RATE_32000 |
                        SNDRV_PCM_RATE_44100 |
                        SNDRV_PCM_RATE_48000 |
                        SNDRV_PCM_RATE_96000),
            .formats = SNDRV_PCM_FMTBIT_S16_LE, },
      .ops = &spdif_dai_ops,
      .suspend = spdif_suspend,
      .resume = spdif_resume,
};

static __devinit int spdif_probe(struct platform_device *pdev)
{
      struct s3c_audio_pdata *spdif_pdata;
      struct resource *mem_res, *dma_res;
      struct samsung_spdif_info *spdif;
      int ret;

      spdif_pdata = pdev->dev.platform_data;

      dev_dbg(&pdev->dev, "Entered %s\n", __func__);

      dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
      if (!dma_res) {
            dev_err(&pdev->dev, "Unable to get 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 (spdif_pdata && spdif_pdata->cfg_gpio
                  && spdif_pdata->cfg_gpio(pdev)) {
            dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
            return -EINVAL;
      }

      spdif = &spdif_info;
      spdif->dev = &pdev->dev;

      spin_lock_init(&spdif->lock);

      spdif->pclk = clk_get(&pdev->dev, "spdif");
      if (IS_ERR(spdif->pclk)) {
            dev_err(&pdev->dev, "failed to get peri-clock\n");
            ret = -ENOENT;
            goto err0;
      }
      clk_enable(spdif->pclk);

      spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
      if (IS_ERR(spdif->sclk)) {
            dev_err(&pdev->dev, "failed to get internal source clock\n");
            ret = -ENOENT;
            goto err1;
      }
      clk_enable(spdif->sclk);

      /* Request S/PDIF Register's memory region */
      if (!request_mem_region(mem_res->start,
                        resource_size(mem_res), "samsung-spdif")) {
            dev_err(&pdev->dev, "Unable to request register region\n");
            ret = -EBUSY;
            goto err2;
      }

      spdif->regs = ioremap(mem_res->start, 0x100);
      if (spdif->regs == NULL) {
            dev_err(&pdev->dev, "Cannot ioremap registers\n");
            ret = -ENXIO;
            goto err3;
      }

      dev_set_drvdata(&pdev->dev, spdif);

      ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
      if (ret != 0) {
            dev_err(&pdev->dev, "fail to register dai\n");
            goto err4;
      }

      spdif_stereo_out.dma_size = 2;
      spdif_stereo_out.client = &spdif_dma_client_out;
      spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
      spdif_stereo_out.channel = dma_res->start;

      spdif->dma_playback = &spdif_stereo_out;

      return 0;

err4:
      iounmap(spdif->regs);
err3:
      release_mem_region(mem_res->start, resource_size(mem_res));
err2:
      clk_disable(spdif->sclk);
      clk_put(spdif->sclk);
err1:
      clk_disable(spdif->pclk);
      clk_put(spdif->pclk);
err0:
      return ret;
}

static __devexit int spdif_remove(struct platform_device *pdev)
{
      struct samsung_spdif_info *spdif = &spdif_info;
      struct resource *mem_res;

      snd_soc_unregister_dai(&pdev->dev);

      iounmap(spdif->regs);

      mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      if (mem_res)
            release_mem_region(mem_res->start, resource_size(mem_res));

      clk_disable(spdif->sclk);
      clk_put(spdif->sclk);
      clk_disable(spdif->pclk);
      clk_put(spdif->pclk);

      return 0;
}

static struct platform_driver samsung_spdif_driver = {
      .probe      = spdif_probe,
      .remove     = spdif_remove,
      .driver     = {
            .name = "samsung-spdif",
            .owner      = THIS_MODULE,
      },
};

static int __init spdif_init(void)
{
      return platform_driver_register(&samsung_spdif_driver);
}
module_init(spdif_init);

static void __exit spdif_exit(void)
{
      platform_driver_unregister(&samsung_spdif_driver);
}
module_exit(spdif_exit);

MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-spdif");

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