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fsi.c

/*
 * Fifo-attached Serial Interface (FSI) support for SH7724
 *
 * Copyright (C) 2009 Renesas Solutions Corp.
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * Based on ssi.c
 * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
 *
 * 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/delay.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/sh_fsi.h>

/* PortA/PortB register */
#define REG_DO_FMT      0x0000
#define REG_DOFF_CTL    0x0004
#define REG_DOFF_ST     0x0008
#define REG_DI_FMT      0x000C
#define REG_DIFF_CTL    0x0010
#define REG_DIFF_ST     0x0014
#define REG_CKG1  0x0018
#define REG_CKG2  0x001C
#define REG_DIDT  0x0020
#define REG_DODT  0x0024
#define REG_MUTE_ST     0x0028
#define REG_OUT_SEL     0x0030

/* master register */
#define MST_CLK_RST     0x0210
#define MST_SOFT_RST    0x0214
#define MST_FIFO_SZ     0x0218

/* core register (depend on FSI version) */
#define A_MST_CTLR      0x0180
#define B_MST_CTLR      0x01A0
#define CPU_INT_ST      0x01F4
#define CPU_IEMSK 0x01F8
#define CPU_IMSK  0x01FC
#define INT_ST          0x0200
#define IEMSK           0x0204
#define IMSK            0x0208

/* DO_FMT */
/* DI_FMT */
#define CR_BWS_24 (0x0 << 20) /* FSI2 */
#define CR_BWS_16 (0x1 << 20) /* FSI2 */
#define CR_BWS_20 (0x2 << 20) /* FSI2 */

#define CR_DTMD_PCM           (0x0 << 8) /* FSI2 */
#define CR_DTMD_SPDIF_PCM     (0x1 << 8) /* FSI2 */
#define CR_DTMD_SPDIF_STREAM  (0x2 << 8) /* FSI2 */

#define CR_MONO         (0x0 << 4)
#define CR_MONO_D (0x1 << 4)
#define CR_PCM          (0x2 << 4)
#define CR_I2S          (0x3 << 4)
#define CR_TDM          (0x4 << 4)
#define CR_TDM_D  (0x5 << 4)

/* DOFF_CTL */
/* DIFF_CTL */
#define IRQ_HALF  0x00100000
#define FIFO_CLR  0x00000001

/* DOFF_ST */
#define ERR_OVER  0x00000010
#define ERR_UNDER 0x00000001
#define ST_ERR          (ERR_OVER | ERR_UNDER)

/* CKG1 */
#define ACKMD_MASK      0x00007000
#define BPFMD_MASK      0x00000700

/* A/B MST_CTLR */
#define BP  (1 << 4)    /* Fix the signal of Biphase output */
#define SE  (1 << 0)    /* Fix the master clock */

/* CLK_RST */
#define B_CLK           0x00000010
#define A_CLK           0x00000001

/* IO SHIFT / MACRO */
#define BI_SHIFT  12
#define BO_SHIFT  8
#define AI_SHIFT  4
#define AO_SHIFT  0
#define AB_IO(param, shift)   (param << shift)

/* SOFT_RST */
#define PBSR            (1 << 12) /* Port B Software Reset */
#define PASR            (1 <<  8) /* Port A Software Reset */
#define IR        (1 <<  4) /* Interrupt Reset */
#define FSISR           (1 <<  0) /* Software Reset */

/* OUT_SEL (FSI2) */
#define DMMD            (1 << 4) /* SPDIF output timing 0: Biphase only */
                         /*               1: Biphase and serial */

/* FIFO_SZ */
#define FIFO_SZ_MASK    0x7

#define FSI_RATES SNDRV_PCM_RATE_8000_96000

#define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)

/*
 * FSI driver use below type name for variable
 *
 * xxx_len  : data length
 * xxx_width      : data width
 * xxx_offset     : data offset
 * xxx_num  : number of data
 */

/*
 *          struct
 */

00127 struct fsi_stream {
      struct snd_pcm_substream *substream;

      int fifo_max_num;
      int chan_num;

      int buff_offset;
      int buff_len;
      int period_len;
      int period_num;

      int uerr_num;
      int oerr_num;
};

00142 struct fsi_priv {
      void __iomem *base;
      struct fsi_master *master;

      struct fsi_stream playback;
      struct fsi_stream capture;

      long rate;
};

00152 struct fsi_core {
      int ver;

      u32 int_st;
      u32 iemsk;
      u32 imsk;
      u32 a_mclk;
      u32 b_mclk;
};

00162 struct fsi_master {
      void __iomem *base;
      int irq;
      struct fsi_priv fsia;
      struct fsi_priv fsib;
      struct fsi_core *core;
      struct sh_fsi_platform_info *info;
      spinlock_t lock;
};

/*
 *          basic read write function
 */

static void __fsi_reg_write(u32 reg, u32 data)
{
      /* valid data area is 24bit */
      data &= 0x00ffffff;

      __raw_writel(data, reg);
}

static u32 __fsi_reg_read(u32 reg)
{
      return __raw_readl(reg);
}

static void __fsi_reg_mask_set(u32 reg, u32 mask, u32 data)
{
      u32 val = __fsi_reg_read(reg);

      val &= ~mask;
      val |= data & mask;

      __fsi_reg_write(reg, val);
}

#define fsi_reg_write(p, r, d)\
      __fsi_reg_write((u32)(p->base + REG_##r), d)

#define fsi_reg_read(p, r)\
      __fsi_reg_read((u32)(p->base + REG_##r))

#define fsi_reg_mask_set(p, r, m, d)\
      __fsi_reg_mask_set((u32)(p->base + REG_##r), m, d)

#define fsi_master_read(p, r) _fsi_master_read(p, MST_##r)
#define fsi_core_read(p, r)   _fsi_master_read(p, p->core->r)
static u32 _fsi_master_read(struct fsi_master *master, u32 reg)
{
      u32 ret;
      unsigned long flags;

      spin_lock_irqsave(&master->lock, flags);
      ret = __fsi_reg_read((u32)(master->base + reg));
      spin_unlock_irqrestore(&master->lock, flags);

      return ret;
}

#define fsi_master_mask_set(p, r, m, d) _fsi_master_mask_set(p, MST_##r, m, d)
#define fsi_core_mask_set(p, r, m, d)  _fsi_master_mask_set(p, p->core->r, m, d)
static void _fsi_master_mask_set(struct fsi_master *master,
                         u32 reg, u32 mask, u32 data)
{
      unsigned long flags;

      spin_lock_irqsave(&master->lock, flags);
      __fsi_reg_mask_set((u32)(master->base + reg), mask, data);
      spin_unlock_irqrestore(&master->lock, flags);
}

/*
 *          basic function
 */

static struct fsi_master *fsi_get_master(struct fsi_priv *fsi)
{
      return fsi->master;
}

static int fsi_is_port_a(struct fsi_priv *fsi)
{
      return fsi->master->base == fsi->base;
}

static struct snd_soc_dai *fsi_get_dai(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;

      return  rtd->cpu_dai;
}

static struct fsi_priv *fsi_get_priv(struct snd_pcm_substream *substream)
{
      struct snd_soc_dai *dai = fsi_get_dai(substream);
      struct fsi_master *master = snd_soc_dai_get_drvdata(dai);

      if (dai->id == 0)
            return &master->fsia;
      else
            return &master->fsib;
}

static u32 fsi_get_info_flags(struct fsi_priv *fsi)
{
      int is_porta = fsi_is_port_a(fsi);
      struct fsi_master *master = fsi_get_master(fsi);

      return is_porta ? master->info->porta_flags :
            master->info->portb_flags;
}

static inline int fsi_stream_is_play(int stream)
{
      return stream == SNDRV_PCM_STREAM_PLAYBACK;
}

static inline int fsi_is_play(struct snd_pcm_substream *substream)
{
      return fsi_stream_is_play(substream->stream);
}

static inline struct fsi_stream *fsi_get_stream(struct fsi_priv *fsi,
                                    int is_play)
{
      return is_play ? &fsi->playback : &fsi->capture;
}

static int fsi_is_master_mode(struct fsi_priv *fsi, int is_play)
{
      u32 mode;
      u32 flags = fsi_get_info_flags(fsi);

      mode = is_play ? SH_FSI_OUT_SLAVE_MODE : SH_FSI_IN_SLAVE_MODE;

      /* return
       * 1 : master mode
       * 0 : slave mode
       */

      return (mode & flags) != mode;
}

static u32 fsi_get_port_shift(struct fsi_priv *fsi, int is_play)
{
      int is_porta = fsi_is_port_a(fsi);
      u32 shift;

      if (is_porta)
            shift = is_play ? AO_SHIFT : AI_SHIFT;
      else
            shift = is_play ? BO_SHIFT : BI_SHIFT;

      return shift;
}

static void fsi_stream_push(struct fsi_priv *fsi,
                      int is_play,
                      struct snd_pcm_substream *substream,
                      u32 buffer_len,
                      u32 period_len)
{
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);

      io->substream     = substream;
      io->buff_len      = buffer_len;
      io->buff_offset   = 0;
      io->period_len    = period_len;
      io->period_num    = 0;
      io->oerr_num      = -1; /* ignore 1st err */
      io->uerr_num      = -1; /* ignore 1st err */
}

static void fsi_stream_pop(struct fsi_priv *fsi, int is_play)
{
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);
      struct snd_soc_dai *dai = fsi_get_dai(io->substream);


      if (io->oerr_num > 0)
            dev_err(dai->dev, "over_run = %d\n", io->oerr_num);

      if (io->uerr_num > 0)
            dev_err(dai->dev, "under_run = %d\n", io->uerr_num);

      io->substream     = NULL;
      io->buff_len      = 0;
      io->buff_offset   = 0;
      io->period_len    = 0;
      io->period_num    = 0;
      io->oerr_num      = 0;
      io->uerr_num      = 0;
}

static int fsi_get_fifo_data_num(struct fsi_priv *fsi, int is_play)
{
      u32 status;
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);
      int data_num;

      status = is_play ?
            fsi_reg_read(fsi, DOFF_ST) :
            fsi_reg_read(fsi, DIFF_ST);

      data_num = 0x1ff & (status >> 8);
      data_num *= io->chan_num;

      return data_num;
}

static int fsi_len2num(int len, int width)
{
      return len / width;
}

#define fsi_num2offset(a, b) fsi_num2len(a, b)
static int fsi_num2len(int num, int width)
{
      return num * width;
}

static int fsi_get_frame_width(struct fsi_priv *fsi, int is_play)
{
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);
      struct snd_pcm_substream *substream = io->substream;
      struct snd_pcm_runtime *runtime = substream->runtime;

      return frames_to_bytes(runtime, 1) / io->chan_num;
}

static void fsi_count_fifo_err(struct fsi_priv *fsi)
{
      u32 ostatus = fsi_reg_read(fsi, DOFF_ST);
      u32 istatus = fsi_reg_read(fsi, DIFF_ST);

      if (ostatus & ERR_OVER)
            fsi->playback.oerr_num++;

      if (ostatus & ERR_UNDER)
            fsi->playback.uerr_num++;

      if (istatus & ERR_OVER)
            fsi->capture.oerr_num++;

      if (istatus & ERR_UNDER)
            fsi->capture.uerr_num++;

      fsi_reg_write(fsi, DOFF_ST, 0);
      fsi_reg_write(fsi, DIFF_ST, 0);
}

/*
 *          dma function
 */

static u8 *fsi_dma_get_area(struct fsi_priv *fsi, int stream)
{
      int is_play = fsi_stream_is_play(stream);
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);

      return io->substream->runtime->dma_area + io->buff_offset;
}

static void fsi_dma_soft_push16(struct fsi_priv *fsi, int num)
{
      u16 *start;
      int i;

      start  = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);

      for (i = 0; i < num; i++)
            fsi_reg_write(fsi, DODT, ((u32)*(start + i) << 8));
}

static void fsi_dma_soft_pop16(struct fsi_priv *fsi, int num)
{
      u16 *start;
      int i;

      start  = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);


      for (i = 0; i < num; i++)
            *(start + i) = (u16)(fsi_reg_read(fsi, DIDT) >> 8);
}

static void fsi_dma_soft_push32(struct fsi_priv *fsi, int num)
{
      u32 *start;
      int i;

      start  = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);


      for (i = 0; i < num; i++)
            fsi_reg_write(fsi, DODT, *(start + i));
}

static void fsi_dma_soft_pop32(struct fsi_priv *fsi, int num)
{
      u32 *start;
      int i;

      start  = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);

      for (i = 0; i < num; i++)
            *(start + i) = fsi_reg_read(fsi, DIDT);
}

/*
 *          irq function
 */

static void fsi_irq_enable(struct fsi_priv *fsi, int is_play)
{
      u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
      struct fsi_master *master = fsi_get_master(fsi);

      fsi_core_mask_set(master, imsk,  data, data);
      fsi_core_mask_set(master, iemsk, data, data);
}

static void fsi_irq_disable(struct fsi_priv *fsi, int is_play)
{
      u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
      struct fsi_master *master = fsi_get_master(fsi);

      fsi_core_mask_set(master, imsk,  data, 0);
      fsi_core_mask_set(master, iemsk, data, 0);
}

static u32 fsi_irq_get_status(struct fsi_master *master)
{
      return fsi_core_read(master, int_st);
}

static void fsi_irq_clear_status(struct fsi_priv *fsi)
{
      u32 data = 0;
      struct fsi_master *master = fsi_get_master(fsi);

      data |= AB_IO(1, fsi_get_port_shift(fsi, 0));
      data |= AB_IO(1, fsi_get_port_shift(fsi, 1));

      /* clear interrupt factor */
      fsi_core_mask_set(master, int_st, data, 0);
}

/*
 *          SPDIF master clock function
 *
 * These functions are used later FSI2
 */
static void fsi_spdif_clk_ctrl(struct fsi_priv *fsi, int enable)
{
      struct fsi_master *master = fsi_get_master(fsi);
      u32 mask, val;

      if (master->core->ver < 2) {
            pr_err("fsi: register access err (%s)\n", __func__);
            return;
      }

      mask = BP | SE;
      val = enable ? mask : 0;

      fsi_is_port_a(fsi) ?
            fsi_core_mask_set(master, a_mclk, mask, val) :
            fsi_core_mask_set(master, b_mclk, mask, val);
}

/*
 *          ctrl function
 */

static void fsi_clk_ctrl(struct fsi_priv *fsi, int enable)
{
      u32 val = fsi_is_port_a(fsi) ? (1 << 0) : (1 << 4);
      struct fsi_master *master = fsi_get_master(fsi);

      if (enable)
            fsi_master_mask_set(master, CLK_RST, val, val);
      else
            fsi_master_mask_set(master, CLK_RST, val, 0);
}

static void fsi_fifo_init(struct fsi_priv *fsi,
                    int is_play,
                    struct snd_soc_dai *dai)
{
      struct fsi_master *master = fsi_get_master(fsi);
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);
      u32 shift, i;

      /* get on-chip RAM capacity */
      shift = fsi_master_read(master, FIFO_SZ);
      shift >>= fsi_get_port_shift(fsi, is_play);
      shift &= FIFO_SZ_MASK;
      io->fifo_max_num = 256 << shift;
      dev_dbg(dai->dev, "fifo = %d words\n", io->fifo_max_num);

      /*
       * The maximum number of sample data varies depending
       * on the number of channels selected for the format.
       *
       * FIFOs are used in 4-channel units in 3-channel mode
       * and in 8-channel units in 5- to 7-channel mode
       * meaning that more FIFOs than the required size of DPRAM
       * are used.
       *
       * ex) if 256 words of DP-RAM is connected
       * 1 channel:  256 (256 x 1 = 256)
       * 2 channels: 128 (128 x 2 = 256)
       * 3 channels:  64 ( 64 x 3 = 192)
       * 4 channels:  64 ( 64 x 4 = 256)
       * 5 channels:  32 ( 32 x 5 = 160)
       * 6 channels:  32 ( 32 x 6 = 192)
       * 7 channels:  32 ( 32 x 7 = 224)
       * 8 channels:  32 ( 32 x 8 = 256)
       */
      for (i = 1; i < io->chan_num; i <<= 1)
            io->fifo_max_num >>= 1;
      dev_dbg(dai->dev, "%d channel %d store\n",
            io->chan_num, io->fifo_max_num);

      /*
       * set interrupt generation factor
       * clear FIFO
       */
      if (is_play) {
            fsi_reg_write(fsi,      DOFF_CTL, IRQ_HALF);
            fsi_reg_mask_set(fsi,   DOFF_CTL, FIFO_CLR, FIFO_CLR);
      } else {
            fsi_reg_write(fsi,      DIFF_CTL, IRQ_HALF);
            fsi_reg_mask_set(fsi,   DIFF_CTL, FIFO_CLR, FIFO_CLR);
      }
}

static void fsi_soft_all_reset(struct fsi_master *master)
{
      /* port AB reset */
      fsi_master_mask_set(master, SOFT_RST, PASR | PBSR, 0);
      mdelay(10);

      /* soft reset */
      fsi_master_mask_set(master, SOFT_RST, FSISR, 0);
      fsi_master_mask_set(master, SOFT_RST, FSISR, FSISR);
      mdelay(10);
}

static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
{
      struct snd_pcm_runtime *runtime;
      struct snd_pcm_substream *substream = NULL;
      int is_play = fsi_stream_is_play(stream);
      struct fsi_stream *io = fsi_get_stream(fsi, is_play);
      int data_residue_num;
      int data_num;
      int data_num_max;
      int ch_width;
      int over_period;
      void (*fn)(struct fsi_priv *fsi, int size);

      if (!fsi                ||
          !io->substream            ||
          !io->substream->runtime)
            return -EINVAL;

      over_period = 0;
      substream   = io->substream;
      runtime           = substream->runtime;

      /* FSI FIFO has limit.
       * So, this driver can not send periods data at a time
       */
      if (io->buff_offset >=
          fsi_num2offset(io->period_num + 1, io->period_len)) {

            over_period = 1;
            io->period_num = (io->period_num + 1) % runtime->periods;

            if (0 == io->period_num)
                  io->buff_offset = 0;
      }

      /* get 1 channel data width */
      ch_width = fsi_get_frame_width(fsi, is_play);

      /* get residue data number of alsa */
      data_residue_num = fsi_len2num(io->buff_len - io->buff_offset,
                               ch_width);

      if (is_play) {
            /*
             * for play-back
             *
             * data_num_max   : number of FSI fifo free space
             * data_num : number of ALSA residue data
             */
            data_num_max  = io->fifo_max_num * io->chan_num;
            data_num_max -= fsi_get_fifo_data_num(fsi, is_play);

            data_num = data_residue_num;

            switch (ch_width) {
            case 2:
                  fn = fsi_dma_soft_push16;
                  break;
            case 4:
                  fn = fsi_dma_soft_push32;
                  break;
            default:
                  return -EINVAL;
            }
      } else {
            /*
             * for capture
             *
             * data_num_max   : number of ALSA free space
             * data_num : number of data in FSI fifo
             */
            data_num_max = data_residue_num;
            data_num     = fsi_get_fifo_data_num(fsi, is_play);

            switch (ch_width) {
            case 2:
                  fn = fsi_dma_soft_pop16;
                  break;
            case 4:
                  fn = fsi_dma_soft_pop32;
                  break;
            default:
                  return -EINVAL;
            }
      }

      data_num = min(data_num, data_num_max);

      fn(fsi, data_num);

      /* update buff_offset */
      io->buff_offset += fsi_num2offset(data_num, ch_width);

      if (over_period)
            snd_pcm_period_elapsed(substream);

      return 0;
}

static int fsi_data_pop(struct fsi_priv *fsi)
{
      return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_CAPTURE);
}

static int fsi_data_push(struct fsi_priv *fsi)
{
      return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_PLAYBACK);
}

static irqreturn_t fsi_interrupt(int irq, void *data)
{
      struct fsi_master *master = data;
      u32 int_st = fsi_irq_get_status(master);

      /* clear irq status */
      fsi_master_mask_set(master, SOFT_RST, IR, 0);
      fsi_master_mask_set(master, SOFT_RST, IR, IR);

      if (int_st & AB_IO(1, AO_SHIFT))
            fsi_data_push(&master->fsia);
      if (int_st & AB_IO(1, BO_SHIFT))
            fsi_data_push(&master->fsib);
      if (int_st & AB_IO(1, AI_SHIFT))
            fsi_data_pop(&master->fsia);
      if (int_st & AB_IO(1, BI_SHIFT))
            fsi_data_pop(&master->fsib);

      fsi_count_fifo_err(&master->fsia);
      fsi_count_fifo_err(&master->fsib);

      fsi_irq_clear_status(&master->fsia);
      fsi_irq_clear_status(&master->fsib);

      return IRQ_HANDLED;
}

/*
 *          dai ops
 */

static int fsi_dai_startup(struct snd_pcm_substream *substream,
                     struct snd_soc_dai *dai)
{
      struct fsi_priv *fsi = fsi_get_priv(substream);
      struct fsi_master *master = fsi_get_master(fsi);
      struct fsi_stream *io;
      u32 flags = fsi_get_info_flags(fsi);
      u32 fmt;
      u32 data;
      int is_play = fsi_is_play(substream);
      int is_master;

      io = fsi_get_stream(fsi, is_play);

      pm_runtime_get_sync(dai->dev);

      /* CKG1 */
      data = is_play ? (1 << 0) : (1 << 4);
      is_master = fsi_is_master_mode(fsi, is_play);
      if (is_master)
            fsi_reg_mask_set(fsi, CKG1, data, data);
      else
            fsi_reg_mask_set(fsi, CKG1, data, 0);

      /* clock inversion (CKG2) */
      data = 0;
      if (SH_FSI_LRM_INV & flags)
            data |= 1 << 12;
      if (SH_FSI_BRM_INV & flags)
            data |= 1 << 8;
      if (SH_FSI_LRS_INV & flags)
            data |= 1 << 4;
      if (SH_FSI_BRS_INV & flags)
            data |= 1 << 0;

      fsi_reg_write(fsi, CKG2, data);

      /* do fmt, di fmt */
      data = 0;
      fmt = is_play ? SH_FSI_GET_OFMT(flags) : SH_FSI_GET_IFMT(flags);
      switch (fmt) {
      case SH_FSI_FMT_MONO:
            data = CR_MONO;
            io->chan_num = 1;
            break;
      case SH_FSI_FMT_MONO_DELAY:
            data = CR_MONO_D;
            io->chan_num = 1;
            break;
      case SH_FSI_FMT_PCM:
            data = CR_PCM;
            io->chan_num = 2;
            break;
      case SH_FSI_FMT_I2S:
            data = CR_I2S;
            io->chan_num = 2;
            break;
      case SH_FSI_FMT_TDM:
            io->chan_num = is_play ?
                  SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags);
            data = CR_TDM | (io->chan_num - 1);
            break;
      case SH_FSI_FMT_TDM_DELAY:
            io->chan_num = is_play ?
                  SH_FSI_GET_CH_O(flags) : SH_FSI_GET_CH_I(flags);
            data = CR_TDM_D | (io->chan_num - 1);
            break;
      case SH_FSI_FMT_SPDIF:
            if (master->core->ver < 2) {
                  dev_err(dai->dev, "This FSI can not use SPDIF\n");
                  return -EINVAL;
            }
            data = CR_BWS_16 | CR_DTMD_SPDIF_PCM | CR_PCM;
            io->chan_num = 2;
            fsi_spdif_clk_ctrl(fsi, 1);
            fsi_reg_mask_set(fsi, OUT_SEL, DMMD, DMMD);
            break;
      default:
            dev_err(dai->dev, "unknown format.\n");
            return -EINVAL;
      }
      is_play ?
            fsi_reg_write(fsi, DO_FMT, data) :
            fsi_reg_write(fsi, DI_FMT, data);

      /* irq clear */
      fsi_irq_disable(fsi, is_play);
      fsi_irq_clear_status(fsi);

      /* fifo init */
      fsi_fifo_init(fsi, is_play, dai);

      return 0;
}

static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
                       struct snd_soc_dai *dai)
{
      struct fsi_priv *fsi = fsi_get_priv(substream);
      int is_play = fsi_is_play(substream);
      struct fsi_master *master = fsi_get_master(fsi);
      int (*set_rate)(struct device *dev, int is_porta, int rate, int enable);

      fsi_irq_disable(fsi, is_play);
      fsi_clk_ctrl(fsi, 0);

      set_rate = master->info->set_rate;
      if (set_rate && fsi->rate)
            set_rate(dai->dev, fsi_is_port_a(fsi), fsi->rate, 0);
      fsi->rate = 0;

      pm_runtime_put_sync(dai->dev);
}

static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
                     struct snd_soc_dai *dai)
{
      struct fsi_priv *fsi = fsi_get_priv(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      int is_play = fsi_is_play(substream);
      int ret = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            fsi_stream_push(fsi, is_play, substream,
                        frames_to_bytes(runtime, runtime->buffer_size),
                        frames_to_bytes(runtime, runtime->period_size));
            ret = is_play ? fsi_data_push(fsi) : fsi_data_pop(fsi);
            fsi_irq_enable(fsi, is_play);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
            fsi_irq_disable(fsi, is_play);
            fsi_stream_pop(fsi, is_play);
            break;
      }

      return ret;
}

static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
                       struct snd_pcm_hw_params *params,
                       struct snd_soc_dai *dai)
{
      struct fsi_priv *fsi = fsi_get_priv(substream);
      struct fsi_master *master = fsi_get_master(fsi);
      int (*set_rate)(struct device *dev, int is_porta, int rate, int enable);
      int fsi_ver = master->core->ver;
      long rate = params_rate(params);
      int ret;

      set_rate = master->info->set_rate;
      if (!set_rate)
            return 0;

      ret = set_rate(dai->dev, fsi_is_port_a(fsi), rate, 1);
      if (ret < 0) /* error */
            return ret;

      fsi->rate = rate;
      if (ret > 0) {
            u32 data = 0;

            switch (ret & SH_FSI_ACKMD_MASK) {
            default:
                  /* FALL THROUGH */
            case SH_FSI_ACKMD_512:
                  data |= (0x0 << 12);
                  break;
            case SH_FSI_ACKMD_256:
                  data |= (0x1 << 12);
                  break;
            case SH_FSI_ACKMD_128:
                  data |= (0x2 << 12);
                  break;
            case SH_FSI_ACKMD_64:
                  data |= (0x3 << 12);
                  break;
            case SH_FSI_ACKMD_32:
                  if (fsi_ver < 2)
                        dev_err(dai->dev, "unsupported ACKMD\n");
                  else
                        data |= (0x4 << 12);
                  break;
            }

            switch (ret & SH_FSI_BPFMD_MASK) {
            default:
                  /* FALL THROUGH */
            case SH_FSI_BPFMD_32:
                  data |= (0x0 << 8);
                  break;
            case SH_FSI_BPFMD_64:
                  data |= (0x1 << 8);
                  break;
            case SH_FSI_BPFMD_128:
                  data |= (0x2 << 8);
                  break;
            case SH_FSI_BPFMD_256:
                  data |= (0x3 << 8);
                  break;
            case SH_FSI_BPFMD_512:
                  data |= (0x4 << 8);
                  break;
            case SH_FSI_BPFMD_16:
                  if (fsi_ver < 2)
                        dev_err(dai->dev, "unsupported ACKMD\n");
                  else
                        data |= (0x7 << 8);
                  break;
            }

            fsi_reg_mask_set(fsi, CKG1, (ACKMD_MASK | BPFMD_MASK) , data);
            udelay(10);
            fsi_clk_ctrl(fsi, 1);
            ret = 0;
      }

      return ret;

}

static struct snd_soc_dai_ops fsi_dai_ops = {
      .startup    = fsi_dai_startup,
      .shutdown   = fsi_dai_shutdown,
      .trigger    = fsi_dai_trigger,
      .hw_params  = fsi_dai_hw_params,
};

/*
 *          pcm ops
 */

static struct snd_pcm_hardware fsi_pcm_hardware = {
      .info =           SNDRV_PCM_INFO_INTERLEAVED    |
                  SNDRV_PCM_INFO_MMAP           |
                  SNDRV_PCM_INFO_MMAP_VALID     |
                  SNDRV_PCM_INFO_PAUSE,
      .formats          = FSI_FMTS,
      .rates                  = FSI_RATES,
      .rate_min         = 8000,
      .rate_max         = 192000,
      .channels_min           = 1,
      .channels_max           = 2,
      .buffer_bytes_max = 64 * 1024,
      .period_bytes_min = 32,
      .period_bytes_max = 8192,
      .periods_min            = 1,
      .periods_max            = 32,
      .fifo_size        = 256,
};

static int fsi_pcm_open(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int ret = 0;

      snd_soc_set_runtime_hwparams(substream, &fsi_pcm_hardware);

      ret = snd_pcm_hw_constraint_integer(runtime,
                                  SNDRV_PCM_HW_PARAM_PERIODS);

      return ret;
}

static int fsi_hw_params(struct snd_pcm_substream *substream,
                   struct snd_pcm_hw_params *hw_params)
{
      return snd_pcm_lib_malloc_pages(substream,
                              params_buffer_bytes(hw_params));
}

static int fsi_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct fsi_priv *fsi = fsi_get_priv(substream);
      struct fsi_stream *io = fsi_get_stream(fsi, fsi_is_play(substream));
      long location;

      location = (io->buff_offset - 1);
      if (location < 0)
            location = 0;

      return bytes_to_frames(runtime, location);
}

static struct snd_pcm_ops fsi_pcm_ops = {
      .open       = fsi_pcm_open,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = fsi_hw_params,
      .hw_free    = fsi_hw_free,
      .pointer    = fsi_pointer,
};

/*
 *          snd_soc_platform
 */

#define PREALLOC_BUFFER       (32 * 1024)
#define PREALLOC_BUFFER_MAX   (32 * 1024)

static void fsi_pcm_free(struct snd_pcm *pcm)
{
      snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int fsi_pcm_new(struct snd_card *card,
                   struct snd_soc_dai *dai,
                   struct snd_pcm *pcm)
{
      /*
       * dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel
       * in MMAP mode (i.e. aplay -M)
       */
      return snd_pcm_lib_preallocate_pages_for_all(
            pcm,
            SNDRV_DMA_TYPE_CONTINUOUS,
            snd_dma_continuous_data(GFP_KERNEL),
            PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
}

/*
 *          alsa struct
 */

static struct snd_soc_dai_driver fsi_soc_dai[] = {
      {
            .name             = "fsia-dai",
            .playback = {
                  .rates            = FSI_RATES,
                  .formats    = FSI_FMTS,
                  .channels_min     = 1,
                  .channels_max     = 8,
            },
            .capture = {
                  .rates            = FSI_RATES,
                  .formats    = FSI_FMTS,
                  .channels_min     = 1,
                  .channels_max     = 8,
            },
            .ops = &fsi_dai_ops,
      },
      {
            .name             = "fsib-dai",
            .playback = {
                  .rates            = FSI_RATES,
                  .formats    = FSI_FMTS,
                  .channels_min     = 1,
                  .channels_max     = 8,
            },
            .capture = {
                  .rates            = FSI_RATES,
                  .formats    = FSI_FMTS,
                  .channels_min     = 1,
                  .channels_max     = 8,
            },
            .ops = &fsi_dai_ops,
      },
};

static struct snd_soc_platform_driver fsi_soc_platform = {
      .ops        = &fsi_pcm_ops,
      .pcm_new    = fsi_pcm_new,
      .pcm_free   = fsi_pcm_free,
};

/*
 *          platform function
 */

static int fsi_probe(struct platform_device *pdev)
{
      struct fsi_master *master;
      const struct platform_device_id     *id_entry;
      struct resource *res;
      unsigned int irq;
      int ret;

      id_entry = pdev->id_entry;
      if (!id_entry) {
            dev_err(&pdev->dev, "unknown fsi device\n");
            return -ENODEV;
      }

      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      irq = platform_get_irq(pdev, 0);
      if (!res || (int)irq <= 0) {
            dev_err(&pdev->dev, "Not enough FSI platform resources.\n");
            ret = -ENODEV;
            goto exit;
      }

      master = kzalloc(sizeof(*master), GFP_KERNEL);
      if (!master) {
            dev_err(&pdev->dev, "Could not allocate master\n");
            ret = -ENOMEM;
            goto exit;
      }

      master->base = ioremap_nocache(res->start, resource_size(res));
      if (!master->base) {
            ret = -ENXIO;
            dev_err(&pdev->dev, "Unable to ioremap FSI registers.\n");
            goto exit_kfree;
      }

      /* master setting */
      master->irq       = irq;
      master->info            = pdev->dev.platform_data;
      master->core            = (struct fsi_core *)id_entry->driver_data;
      spin_lock_init(&master->lock);

      /* FSI A setting */
      master->fsia.base = master->base;
      master->fsia.master     = master;

      /* FSI B setting */
      master->fsib.base = master->base + 0x40;
      master->fsib.master     = master;

      pm_runtime_enable(&pdev->dev);
      pm_runtime_resume(&pdev->dev);
      dev_set_drvdata(&pdev->dev, master);

      fsi_soft_all_reset(master);

      ret = request_irq(irq, &fsi_interrupt, IRQF_DISABLED,
                    id_entry->name, master);
      if (ret) {
            dev_err(&pdev->dev, "irq request err\n");
            goto exit_iounmap;
      }

      ret = snd_soc_register_platform(&pdev->dev, &fsi_soc_platform);
      if (ret < 0) {
            dev_err(&pdev->dev, "cannot snd soc register\n");
            goto exit_free_irq;
      }

      return snd_soc_register_dais(&pdev->dev, fsi_soc_dai, ARRAY_SIZE(fsi_soc_dai));

exit_free_irq:
      free_irq(irq, master);
exit_iounmap:
      iounmap(master->base);
      pm_runtime_disable(&pdev->dev);
exit_kfree:
      kfree(master);
      master = NULL;
exit:
      return ret;
}

static int fsi_remove(struct platform_device *pdev)
{
      struct fsi_master *master;

      master = dev_get_drvdata(&pdev->dev);

      snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(fsi_soc_dai));
      snd_soc_unregister_platform(&pdev->dev);

      pm_runtime_disable(&pdev->dev);

      free_irq(master->irq, master);

      iounmap(master->base);
      kfree(master);

      return 0;
}

static int fsi_runtime_nop(struct device *dev)
{
      /* Runtime PM callback shared between ->runtime_suspend()
       * and ->runtime_resume(). Simply returns success.
       *
       * This driver re-initializes all registers after
       * pm_runtime_get_sync() anyway so there is no need
       * to save and restore registers here.
       */
      return 0;
}

static struct dev_pm_ops fsi_pm_ops = {
      .runtime_suspend  = fsi_runtime_nop,
      .runtime_resume         = fsi_runtime_nop,
};

static struct fsi_core fsi1_core = {
      .ver  = 1,

      /* Interrupt */
      .int_st     = INT_ST,
      .iemsk      = IEMSK,
      .imsk = IMSK,
};

static struct fsi_core fsi2_core = {
      .ver  = 2,

      /* Interrupt */
      .int_st     = CPU_INT_ST,
      .iemsk      = CPU_IEMSK,
      .imsk = CPU_IMSK,
      .a_mclk     = A_MST_CTLR,
      .b_mclk     = B_MST_CTLR,
};

static struct platform_device_id fsi_id_table[] = {
      { "sh_fsi", (kernel_ulong_t)&fsi1_core },
      { "sh_fsi2",      (kernel_ulong_t)&fsi2_core },
      {},
};
MODULE_DEVICE_TABLE(platform, fsi_id_table);

static struct platform_driver fsi_driver = {
      .driver     = {
            .name = "fsi-pcm-audio",
            .pm   = &fsi_pm_ops,
      },
      .probe            = fsi_probe,
      .remove           = fsi_remove,
      .id_table   = fsi_id_table,
};

static int __init fsi_mobile_init(void)
{
      return platform_driver_register(&fsi_driver);
}

static void __exit fsi_mobile_exit(void)
{
      platform_driver_unregister(&fsi_driver);
}

module_init(fsi_mobile_init);
module_exit(fsi_mobile_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SuperH onchip FSI audio driver");
MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");

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