Quelle  img-spdif-in.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * IMG SPDIF input controller driver
 *
 * Copyright (C) 2015 Imagination Technologies Ltd.
 *
 * Author: Damien Horsley <Damien.Horsley@imgtec.com>
 */

#include <linux/clk.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#define IMG_SPDIF_IN_RX_FIFO_OFFSET  0

#define IMG_SPDIF_IN_CTL   0x4
#define IMG_SPDIF_IN_CTL_LOCKLO_MASK  0xff
#define IMG_SPDIF_IN_CTL_LOCKLO_SHIFT  0
#define IMG_SPDIF_IN_CTL_LOCKHI_MASK  0xff00
#define IMG_SPDIF_IN_CTL_LOCKHI_SHIFT  8
#define IMG_SPDIF_IN_CTL_TRK_MASK  0xff0000
#define IMG_SPDIF_IN_CTL_TRK_SHIFT  16
#define IMG_SPDIF_IN_CTL_SRD_MASK  0x70000000
#define IMG_SPDIF_IN_CTL_SRD_SHIFT  28
#define IMG_SPDIF_IN_CTL_SRT_MASK  BIT(31)

#define IMG_SPDIF_IN_STATUS   0x8
#define IMG_SPDIF_IN_STATUS_SAM_MASK  0x7000
#define IMG_SPDIF_IN_STATUS_SAM_SHIFT  12
#define IMG_SPDIF_IN_STATUS_LOCK_MASK  BIT(15)
#define IMG_SPDIF_IN_STATUS_LOCK_SHIFT  15

#define IMG_SPDIF_IN_CLKGEN   0x1c
#define IMG_SPDIF_IN_CLKGEN_NOM_MASK  0x3ff
#define IMG_SPDIF_IN_CLKGEN_NOM_SHIFT  0
#define IMG_SPDIF_IN_CLKGEN_HLD_MASK  0x3ff0000
#define IMG_SPDIF_IN_CLKGEN_HLD_SHIFT  16

#define IMG_SPDIF_IN_CSL   0x20

#define IMG_SPDIF_IN_CSH   0x24
#define IMG_SPDIF_IN_CSH_MASK   0xff
#define IMG_SPDIF_IN_CSH_SHIFT   0

#define IMG_SPDIF_IN_SOFT_RESET   0x28
#define IMG_SPDIF_IN_SOFT_RESET_MASK  BIT(0)

#define IMG_SPDIF_IN_ACLKGEN_START  0x2c
#define IMG_SPDIF_IN_ACLKGEN_NOM_MASK  0x3ff
#define IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT  0
#define IMG_SPDIF_IN_ACLKGEN_HLD_MASK  0xffc00
#define IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT  10
#define IMG_SPDIF_IN_ACLKGEN_TRK_MASK  0xff00000
#define IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT  20

#define IMG_SPDIF_IN_NUM_ACLKGEN  4

struct img_spdif_in {
 spinlock_t lock;
 void __iomem *base;
 struct clk *clk_sys;
 struct snd_dmaengine_dai_dma_data dma_data;
 struct device *dev;
 unsigned int trk;
 bool multi_freq;
 int lock_acquire;
 int lock_release;
 unsigned int single_freq;
 unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
 bool active;
 u32 suspend_clkgen;
 u32 suspend_ctl;

 /* Write-only registers */
 unsigned int aclkgen_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
};

static int img_spdif_in_runtime_suspend(struct device *dev)
{
 struct img_spdif_in *spdif = dev_get_drvdata(dev);

 clk_disable_unprepare(spdif->clk_sys);

 return 0;
}

static int img_spdif_in_runtime_resume(struct device *dev)
{
 struct img_spdif_in *spdif = dev_get_drvdata(dev);
 int ret;

 ret = clk_prepare_enable(spdif->clk_sys);
 if (ret) {
  dev_err(dev, "Unable to enable sys clock\n");
  return ret;
 }

 return 0;
}

static inline void img_spdif_in_writel(struct img_spdif_in *spdif,
     u32 val, u32 reg)
{
 writel(val, spdif->base + reg);
}

static inline u32 img_spdif_in_readl(struct img_spdif_in *spdif, u32 reg)
{
 return readl(spdif->base + reg);
}

static inline void img_spdif_in_aclkgen_writel(struct img_spdif_in *spdif,
      u32 index)
{
 img_spdif_in_writel(spdif, spdif->aclkgen_regs[index],
   IMG_SPDIF_IN_ACLKGEN_START + (index * 0x4));
}

static int img_spdif_in_check_max_rate(struct img_spdif_in *spdif,
  unsigned int sample_rate, unsigned long *actual_freq)
{
 unsigned long min_freq, freq_t;

 /* Clock rate must be at least 24x the bit rate */
 min_freq = sample_rate * 2 * 32 * 24;

 freq_t = clk_get_rate(spdif->clk_sys);

 if (freq_t < min_freq)
  return -EINVAL;

 *actual_freq = freq_t;

 return 0;
}

static int img_spdif_in_do_clkgen_calc(unsigned int rate, unsigned int *pnom,
  unsigned int *phld, unsigned long clk_rate)
{
 unsigned int ori, nom, hld;

 /*
 * Calculate oversampling ratio, nominal phase increment and hold
 * increment for the given rate / frequency
 */

 if (!rate)
  return -EINVAL;

 ori = clk_rate / (rate * 64);

 if (!ori)
  return -EINVAL;

 nom = (4096 / ori) + 1;
 do
  hld = 4096 - (--nom * (ori - 1));
 while (hld < 120);

 *pnom = nom;
 *phld = hld;

 return 0;
}

static int img_spdif_in_do_clkgen_single(struct img_spdif_in *spdif,
  unsigned int rate)
{
 unsigned int nom, hld;
 unsigned long flags, clk_rate;
 int ret = 0;
 u32 reg;

 ret = img_spdif_in_check_max_rate(spdif, rate, &clk_rate);
 if (ret)
  return ret;

 ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
 if (ret)
  return ret;

 reg = (nom << IMG_SPDIF_IN_CLKGEN_NOM_SHIFT) &
  IMG_SPDIF_IN_CLKGEN_NOM_MASK;
 reg |= (hld << IMG_SPDIF_IN_CLKGEN_HLD_SHIFT) &
  IMG_SPDIF_IN_CLKGEN_HLD_MASK;

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CLKGEN);

 spdif->single_freq = rate;

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_do_clkgen_multi(struct img_spdif_in *spdif,
  unsigned int multi_freqs[])
{
 unsigned int nom, hld, rate, max_rate = 0;
 unsigned long flags, clk_rate;
 int i, ret = 0;
 u32 reg, trk_reg, temp_regs[IMG_SPDIF_IN_NUM_ACLKGEN];

 for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++)
  if (multi_freqs[i] > max_rate)
   max_rate = multi_freqs[i];

 ret = img_spdif_in_check_max_rate(spdif, max_rate, &clk_rate);
 if (ret)
  return ret;

 for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
  rate = multi_freqs[i];

  ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
  if (ret)
   return ret;

  reg = (nom << IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT) &
   IMG_SPDIF_IN_ACLKGEN_NOM_MASK;
  reg |= (hld << IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT) &
   IMG_SPDIF_IN_ACLKGEN_HLD_MASK;
  temp_regs[i] = reg;
 }

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 trk_reg = spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT;

 for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
  spdif->aclkgen_regs[i] = temp_regs[i] | trk_reg;
  img_spdif_in_aclkgen_writel(spdif, i);
 }

 spdif->multi_freq = true;
 spdif->multi_freqs[0] = multi_freqs[0];
 spdif->multi_freqs[1] = multi_freqs[1];
 spdif->multi_freqs[2] = multi_freqs[2];
 spdif->multi_freqs[3] = multi_freqs[3];

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_iec958_info(struct snd_kcontrol *kcontrol,
  struct snd_ctl_elem_info *uinfo)
{
 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 uinfo->count = 1;

 return 0;
}

static int img_spdif_in_get_status_mask(struct snd_kcontrol *kcontrol,
           struct snd_ctl_elem_value *ucontrol)
{
 ucontrol->value.iec958.status[0] = 0xff;
 ucontrol->value.iec958.status[1] = 0xff;
 ucontrol->value.iec958.status[2] = 0xff;
 ucontrol->value.iec958.status[3] = 0xff;
 ucontrol->value.iec958.status[4] = 0xff;

 return 0;
}

static int img_spdif_in_get_status(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 u32 reg;

 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSL);
 ucontrol->value.iec958.status[0] = reg & 0xff;
 ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
 ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
 ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSH);
 ucontrol->value.iec958.status[4] = (reg & IMG_SPDIF_IN_CSH_MASK)
  >> IMG_SPDIF_IN_CSH_SHIFT;

 return 0;
}

static int img_spdif_in_info_multi_freq(struct snd_kcontrol *kcontrol,
  struct snd_ctl_elem_info *uinfo)
{
 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 uinfo->count = IMG_SPDIF_IN_NUM_ACLKGEN;
 uinfo->value.integer.min = 0;
 uinfo->value.integer.max = LONG_MAX;

 return 0;
}

static int img_spdif_in_get_multi_freq(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 unsigned long flags;

 spin_lock_irqsave(&spdif->lock, flags);
 if (spdif->multi_freq) {
  ucontrol->value.integer.value[0] = spdif->multi_freqs[0];
  ucontrol->value.integer.value[1] = spdif->multi_freqs[1];
  ucontrol->value.integer.value[2] = spdif->multi_freqs[2];
  ucontrol->value.integer.value[3] = spdif->multi_freqs[3];
 } else {
  ucontrol->value.integer.value[0] = 0;
  ucontrol->value.integer.value[1] = 0;
  ucontrol->value.integer.value[2] = 0;
  ucontrol->value.integer.value[3] = 0;
 }
 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_set_multi_freq(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
 bool multi_freq;
 unsigned long flags;

 if ((ucontrol->value.integer.value[0] == 0) &&
   (ucontrol->value.integer.value[1] == 0) &&
   (ucontrol->value.integer.value[2] == 0) &&
   (ucontrol->value.integer.value[3] == 0)) {
  multi_freq = false;
 } else {
  multi_freqs[0] = ucontrol->value.integer.value[0];
  multi_freqs[1] = ucontrol->value.integer.value[1];
  multi_freqs[2] = ucontrol->value.integer.value[2];
  multi_freqs[3] = ucontrol->value.integer.value[3];
  multi_freq = true;
 }

 if (multi_freq)
  return img_spdif_in_do_clkgen_multi(spdif, multi_freqs);

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 spdif->multi_freq = false;

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_info_lock_freq(struct snd_kcontrol *kcontrol,
  struct snd_ctl_elem_info *uinfo)
{
 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 uinfo->count = 1;
 uinfo->value.integer.min = 0;
 uinfo->value.integer.max = LONG_MAX;

 return 0;
}

static int img_spdif_in_get_lock_freq(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *uc)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 u32 reg;
 int i;
 unsigned long flags;

 spin_lock_irqsave(&spdif->lock, flags);

 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_STATUS);
 if (reg & IMG_SPDIF_IN_STATUS_LOCK_MASK) {
  if (spdif->multi_freq) {
   i = ((reg & IMG_SPDIF_IN_STATUS_SAM_MASK) >>
     IMG_SPDIF_IN_STATUS_SAM_SHIFT) - 1;
   uc->value.integer.value[0] = spdif->multi_freqs[i];
  } else {
   uc->value.integer.value[0] = spdif->single_freq;
  }
 } else {
  uc->value.integer.value[0] = 0;
 }

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_info_trk(struct snd_kcontrol *kcontrol,
  struct snd_ctl_elem_info *uinfo)
{
 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 uinfo->count = 1;
 uinfo->value.integer.min = 0;
 uinfo->value.integer.max = 255;

 return 0;
}

static int img_spdif_in_get_trk(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);

 ucontrol->value.integer.value[0] = spdif->trk;

 return 0;
}

static int img_spdif_in_set_trk(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 unsigned long flags;
 int i;
 u32 reg;

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 spdif->trk = ucontrol->value.integer.value[0];

 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 reg &= ~IMG_SPDIF_IN_CTL_TRK_MASK;
 reg |= spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT;
 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);

 for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
  spdif->aclkgen_regs[i] = (spdif->aclkgen_regs[i] &
   ~IMG_SPDIF_IN_ACLKGEN_TRK_MASK) |
   (spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT);

  img_spdif_in_aclkgen_writel(spdif, i);
 }

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_info_lock(struct snd_kcontrol *kcontrol,
  struct snd_ctl_elem_info *uinfo)
{
 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 uinfo->count = 1;
 uinfo->value.integer.min = -128;
 uinfo->value.integer.max = 127;

 return 0;
}

static int img_spdif_in_get_lock_acquire(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);

 ucontrol->value.integer.value[0] = spdif->lock_acquire;

 return 0;
}

static int img_spdif_in_set_lock_acquire(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 unsigned long flags;
 u32 reg;

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 spdif->lock_acquire = ucontrol->value.integer.value[0];

 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 reg &= ~IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 reg |= (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
  IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static int img_spdif_in_get_lock_release(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);

 ucontrol->value.integer.value[0] = spdif->lock_release;

 return 0;
}

static int img_spdif_in_set_lock_release(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 unsigned long flags;
 u32 reg;

 spin_lock_irqsave(&spdif->lock, flags);

 if (spdif->active) {
  spin_unlock_irqrestore(&spdif->lock, flags);
  return -EBUSY;
 }

 spdif->lock_release = ucontrol->value.integer.value[0];

 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 reg &= ~IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
  IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);

 spin_unlock_irqrestore(&spdif->lock, flags);

 return 0;
}

static struct snd_kcontrol_new img_spdif_in_controls[] = {
 {
  .access = SNDRV_CTL_ELEM_ACCESS_READ,
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
  .info = img_spdif_in_iec958_info,
  .get = img_spdif_in_get_status_mask
 },
 {
  .access = SNDRV_CTL_ELEM_ACCESS_READ |
   SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
  .info = img_spdif_in_iec958_info,
  .get = img_spdif_in_get_status
 },
 {
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = "SPDIF In Multi Frequency Acquire",
  .info = img_spdif_in_info_multi_freq,
  .get = img_spdif_in_get_multi_freq,
  .put = img_spdif_in_set_multi_freq
 },
 {
  .access = SNDRV_CTL_ELEM_ACCESS_READ |
   SNDRV_CTL_ELEM_ACCESS_VOLATILE,
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = "SPDIF In Lock Frequency",
  .info = img_spdif_in_info_lock_freq,
  .get = img_spdif_in_get_lock_freq
 },
 {
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = "SPDIF In Lock TRK",
  .info = img_spdif_in_info_trk,
  .get = img_spdif_in_get_trk,
  .put = img_spdif_in_set_trk
 },
 {
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = "SPDIF In Lock Acquire Threshold",
  .info = img_spdif_in_info_lock,
  .get = img_spdif_in_get_lock_acquire,
  .put = img_spdif_in_set_lock_acquire
 },
 {
  .iface = SNDRV_CTL_ELEM_IFACE_PCM,
  .name = "SPDIF In Lock Release Threshold",
  .info = img_spdif_in_info_lock,
  .get = img_spdif_in_get_lock_release,
  .put = img_spdif_in_set_lock_release
 }
};

static int img_spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
 struct snd_soc_dai *dai)
{
 unsigned long flags;
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
 int ret = 0;
 u32 reg;

 spin_lock_irqsave(&spdif->lock, flags);

 switch (cmd) {
 case SNDRV_PCM_TRIGGER_START:
 case SNDRV_PCM_TRIGGER_RESUME:
 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
  if (spdif->multi_freq)
   reg &= ~IMG_SPDIF_IN_CTL_SRD_MASK;
  else
   reg |= (1UL << IMG_SPDIF_IN_CTL_SRD_SHIFT);
  reg |= IMG_SPDIF_IN_CTL_SRT_MASK;
  img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
  spdif->active = true;
  break;
 case SNDRV_PCM_TRIGGER_STOP:
 case SNDRV_PCM_TRIGGER_SUSPEND:
 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
  reg &= ~IMG_SPDIF_IN_CTL_SRT_MASK;
  img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
  spdif->active = false;
  break;
 default:
  ret = -EINVAL;
 }

 spin_unlock_irqrestore(&spdif->lock, flags);

 return ret;
}

static int img_spdif_in_hw_params(struct snd_pcm_substream *substream,
 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
 unsigned int rate, channels;
 snd_pcm_format_t format;

 rate = params_rate(params);
 channels = params_channels(params);
 format = params_format(params);

 if (format != SNDRV_PCM_FORMAT_S32_LE)
  return -EINVAL;

 if (channels != 2)
  return -EINVAL;

 return img_spdif_in_do_clkgen_single(spdif, rate);
}

static int img_spdif_in_dai_probe(struct snd_soc_dai *dai)
{
 struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);

 snd_soc_dai_init_dma_data(dai, NULL, &spdif->dma_data);

 snd_soc_add_dai_controls(dai, img_spdif_in_controls,
   ARRAY_SIZE(img_spdif_in_controls));

 return 0;
}

static const struct snd_soc_dai_ops img_spdif_in_dai_ops = {
 .probe  = img_spdif_in_dai_probe,
 .trigger = img_spdif_in_trigger,
 .hw_params = img_spdif_in_hw_params
};

static struct snd_soc_dai_driver img_spdif_in_dai = {
 .capture = {
  .channels_min = 2,
  .channels_max = 2,
  .rates = SNDRV_PCM_RATE_8000_192000,
  .formats = SNDRV_PCM_FMTBIT_S32_LE
 },
 .ops = &img_spdif_in_dai_ops
};

static const struct snd_soc_component_driver img_spdif_in_component = {
 .name = "img-spdif-in",
 .legacy_dai_naming = 1,
};

static int img_spdif_in_probe(struct platform_device *pdev)
{
 struct img_spdif_in *spdif;
 struct resource *res;
 void __iomem *base;
 int ret;
 struct reset_control *rst;
 u32 reg;
 struct device *dev = &pdev->dev;

 spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
 if (!spdif)
  return -ENOMEM;

 platform_set_drvdata(pdev, spdif);

 spdif->dev = &pdev->dev;

 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 if (IS_ERR(base))
  return PTR_ERR(base);

 spdif->base = base;

 spdif->clk_sys = devm_clk_get(dev, "sys");
 if (IS_ERR(spdif->clk_sys))
  return dev_err_probe(dev, PTR_ERR(spdif->clk_sys),
         "Failed to acquire clock 'sys'\n");

 pm_runtime_enable(&pdev->dev);
 if (!pm_runtime_enabled(&pdev->dev)) {
  ret = img_spdif_in_runtime_resume(&pdev->dev);
  if (ret)
   goto err_pm_disable;
 }
 ret = pm_runtime_resume_and_get(&pdev->dev);
 if (ret < 0)
  goto err_suspend;

 rst = devm_reset_control_get_exclusive(&pdev->dev, "rst");
 if (IS_ERR(rst)) {
  if (PTR_ERR(rst) == -EPROBE_DEFER) {
   ret = -EPROBE_DEFER;
   goto err_pm_put;
  }
  dev_dbg(dev, "No top level reset found\n");
  img_spdif_in_writel(spdif, IMG_SPDIF_IN_SOFT_RESET_MASK,
    IMG_SPDIF_IN_SOFT_RESET);
  img_spdif_in_writel(spdif, 0, IMG_SPDIF_IN_SOFT_RESET);
 } else {
  reset_control_assert(rst);
  reset_control_deassert(rst);
 }

 spin_lock_init(&spdif->lock);

 spdif->dma_data.addr = res->start + IMG_SPDIF_IN_RX_FIFO_OFFSET;
 spdif->dma_data.addr_width = 4;
 spdif->dma_data.maxburst = 4;
 spdif->trk = 0x80;
 spdif->lock_acquire = 4;
 spdif->lock_release = -128;

 reg = (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
  IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
  IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 reg |= (spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT) &
  IMG_SPDIF_IN_CTL_TRK_MASK;
 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);

 pm_runtime_put(&pdev->dev);

 ret = devm_snd_soc_register_component(&pdev->dev,
   &img_spdif_in_component, &img_spdif_in_dai, 1);
 if (ret)
  goto err_suspend;

 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 if (ret)
  goto err_suspend;

 return 0;

err_pm_put:
 pm_runtime_put(&pdev->dev);
err_suspend:
 if (!pm_runtime_enabled(&pdev->dev))
  img_spdif_in_runtime_suspend(&pdev->dev);
err_pm_disable:
 pm_runtime_disable(&pdev->dev);

 return ret;
}

static void img_spdif_in_dev_remove(struct platform_device *pdev)
{
 pm_runtime_disable(&pdev->dev);
 if (!pm_runtime_status_suspended(&pdev->dev))
  img_spdif_in_runtime_suspend(&pdev->dev);
}

static int img_spdif_in_suspend(struct device *dev)
{
 struct img_spdif_in *spdif = dev_get_drvdata(dev);
 int ret;

 if (pm_runtime_status_suspended(dev)) {
  ret = img_spdif_in_runtime_resume(dev);
  if (ret)
   return ret;
 }

 spdif->suspend_clkgen = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CLKGEN);
 spdif->suspend_ctl = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);

 img_spdif_in_runtime_suspend(dev);

 return 0;
}

static int img_spdif_in_resume(struct device *dev)
{
 struct img_spdif_in *spdif = dev_get_drvdata(dev);
 int i, ret;

 ret = img_spdif_in_runtime_resume(dev);
 if (ret)
  return ret;

 for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++)
  img_spdif_in_aclkgen_writel(spdif, i);

 img_spdif_in_writel(spdif, spdif->suspend_clkgen, IMG_SPDIF_IN_CLKGEN);
 img_spdif_in_writel(spdif, spdif->suspend_ctl, IMG_SPDIF_IN_CTL);

 if (pm_runtime_status_suspended(dev))
  img_spdif_in_runtime_suspend(dev);

 return 0;
}

static const struct of_device_id img_spdif_in_of_match[] = {
 { .compatible = "img,spdif-in" },
 {}
};
MODULE_DEVICE_TABLE(of, img_spdif_in_of_match);

static const struct dev_pm_ops img_spdif_in_pm_ops = {
 RUNTIME_PM_OPS(img_spdif_in_runtime_suspend, img_spdif_in_runtime_resume, NULL)
 SYSTEM_SLEEP_PM_OPS(img_spdif_in_suspend, img_spdif_in_resume)
};

static struct platform_driver img_spdif_in_driver = {
 .driver = {
  .name = "img-spdif-in",
  .of_match_table = img_spdif_in_of_match,
  .pm = pm_ptr(&img_spdif_in_pm_ops)
 },
 .probe = img_spdif_in_probe,
 .remove = img_spdif_in_dev_remove
};
module_platform_driver(img_spdif_in_driver);

MODULE_AUTHOR("Damien Horsley ");
MODULE_DESCRIPTION("IMG SPDIF Input driver");
MODULE_LICENSE("GPL v2");