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mpc5200_psc_ac97.c

/*
 * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
 *
 * Copyright (C) 2009 Jon Smirl, Digispeaker
 * Author: Jon Smirl <jonsmirl@gmail.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/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/delay.h>

#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/time.h>
#include <asm/delay.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"
#include "mpc5200_psc_ac97.h"

#define DRV_NAME "mpc5200-psc-ac97"

/* ALSA only supports a single AC97 device so static is recommend here */
static struct psc_dma *psc_dma;

static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
      int status;
      unsigned int val;

      mutex_lock(&psc_dma->mutex);

      /* Wait for command send status zero = ready */
      status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
                        MPC52xx_PSC_SR_CMDSEND), 100, 0);
      if (status == 0) {
            pr_err("timeout on ac97 bus (rdy)\n");
            mutex_unlock(&psc_dma->mutex);
            return -ENODEV;
      }

      /* Force clear the data valid bit */
      in_be32(&psc_dma->psc_regs->ac97_data);

      /* Send the read */
      out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));

      /* Wait for the answer */
      status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
                        MPC52xx_PSC_SR_DATA_VAL), 100, 0);
      if (status == 0) {
            pr_err("timeout on ac97 read (val) %x\n",
                        in_be16(&psc_dma->psc_regs->sr_csr.status));
            mutex_unlock(&psc_dma->mutex);
            return -ENODEV;
      }
      /* Get the data */
      val = in_be32(&psc_dma->psc_regs->ac97_data);
      if (((val >> 24) & 0x7f) != reg) {
            pr_err("reg echo error on ac97 read\n");
            mutex_unlock(&psc_dma->mutex);
            return -ENODEV;
      }
      val = (val >> 8) & 0xffff;

      mutex_unlock(&psc_dma->mutex);
      return (unsigned short) val;
}

static void psc_ac97_write(struct snd_ac97 *ac97,
                        unsigned short reg, unsigned short val)
{
      int status;

      mutex_lock(&psc_dma->mutex);

      /* Wait for command status zero = ready */
      status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
                        MPC52xx_PSC_SR_CMDSEND), 100, 0);
      if (status == 0) {
            pr_err("timeout on ac97 bus (write)\n");
            goto out;
      }
      /* Write data */
      out_be32(&psc_dma->psc_regs->ac97_cmd,
                  ((reg & 0x7f) << 24) | (val << 8));

 out:
      mutex_unlock(&psc_dma->mutex);
}

static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
{
      struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

      out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
      udelay(3);
      out_be32(&regs->sicr, psc_dma->sicr);
}

static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
{
      struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

      /* Do a cold reset */
      out_8(&regs->op1, MPC52xx_PSC_OP_RES);
      udelay(10);
      out_8(&regs->op0, MPC52xx_PSC_OP_RES);
      msleep(1);
      psc_ac97_warm_reset(ac97);
}

struct snd_ac97_bus_ops soc_ac97_ops = {
      .read       = psc_ac97_read,
      .write            = psc_ac97_write,
      .reset            = psc_ac97_cold_reset,
      .warm_reset = psc_ac97_warm_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);

static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params,
                         struct snd_soc_dai *cpu_dai)
{
      struct psc_dma *psc_dma = cpu_dai->private_data;

      dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
            " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
            " rate=%i format=%i\n",
            __func__, substream, params_period_size(params),
            params_period_bytes(params), params_periods(params),
            params_buffer_size(params), params_buffer_bytes(params),
            params_channels(params), params_rate(params),
            params_format(params));


      if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
            if (params_channels(params) == 1)
                  psc_dma->slots |= 0x00000100;
            else
                  psc_dma->slots |= 0x00000300;
      } else {
            if (params_channels(params) == 1)
                  psc_dma->slots |= 0x01000000;
            else
                  psc_dma->slots |= 0x03000000;
      }
      out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);

      return 0;
}

static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params,
                         struct snd_soc_dai *cpu_dai)
{
      struct psc_dma *psc_dma = cpu_dai->private_data;

      if (params_channels(params) == 1)
            out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
      else
            out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);

      return 0;
}

static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
                                          struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_STOP:
            if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
                  psc_dma->slots &= 0xFFFF0000;
            else
                  psc_dma->slots &= 0x0000FFFF;

            out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
            break;
      }
      return 0;
}

static int psc_ac97_probe(struct platform_device *pdev,
                              struct snd_soc_dai *cpu_dai)
{
      struct psc_dma *psc_dma = cpu_dai->private_data;
      struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

      /* Go */
      out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
      return 0;
}

/* ---------------------------------------------------------------------
 * ALSA SoC Bindings
 *
 * - Digital Audio Interface (DAI) template
 * - create/destroy dai hooks
 */

/**
 * psc_ac97_dai_template: template CPU Digital Audio Interface
 */
static struct snd_soc_dai_ops psc_ac97_analog_ops = {
      .hw_params  = psc_ac97_hw_analog_params,
      .trigger    = psc_ac97_trigger,
};

static struct snd_soc_dai_ops psc_ac97_digital_ops = {
      .hw_params  = psc_ac97_hw_digital_params,
};

struct snd_soc_dai psc_ac97_dai[] = {
{
      .name   = "AC97",
      .ac97_control = 1,
      .probe      = psc_ac97_probe,
      .playback = {
            .channels_min   = 1,
            .channels_max   = 6,
            .rates          = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S32_BE,
      },
      .capture = {
            .channels_min   = 1,
            .channels_max   = 2,
            .rates          = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S32_BE,
      },
      .ops = &psc_ac97_analog_ops,
},
{
      .name   = "SPDIF",
      .ac97_control = 1,
      .playback = {
            .channels_min   = 1,
            .channels_max   = 2,
            .rates          = SNDRV_PCM_RATE_32000 | \
                  SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
      },
      .ops = &psc_ac97_digital_ops,
} };
EXPORT_SYMBOL_GPL(psc_ac97_dai);



/* ---------------------------------------------------------------------
 * OF platform bus binding code:
 * - Probe/remove operations
 * - OF device match table
 */
static int __devinit psc_ac97_of_probe(struct of_device *op,
                              const struct of_device_id *match)
{
      int rc, i;
      struct snd_ac97 ac97;
      struct mpc52xx_psc __iomem *regs;

      rc = mpc5200_audio_dma_create(op);
      if (rc != 0)
            return rc;

      for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
            psc_ac97_dai[i].dev = &op->dev;

      rc = snd_soc_register_dais(psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
      if (rc != 0) {
            dev_err(&op->dev, "Failed to register DAI\n");
            return rc;
      }

      psc_dma = dev_get_drvdata(&op->dev);
      regs = psc_dma->psc_regs;
      ac97.private_data = psc_dma;

      for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
            psc_ac97_dai[i].private_data = psc_dma;

      psc_dma->imr = 0;
      out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);

      /* Configure the serial interface mode to AC97 */
      psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
      out_be32(&regs->sicr, psc_dma->sicr);

      /* No slots active */
      out_be32(&regs->ac97_slots, 0x00000000);

      return 0;
}

static int __devexit psc_ac97_of_remove(struct of_device *op)
{
      return mpc5200_audio_dma_destroy(op);
}

/* Match table for of_platform binding */
static struct of_device_id psc_ac97_match[] __devinitdata = {
      { .compatible = "fsl,mpc5200-psc-ac97", },
      { .compatible = "fsl,mpc5200b-psc-ac97", },
      {}
};
MODULE_DEVICE_TABLE(of, psc_ac97_match);

static struct of_platform_driver psc_ac97_driver = {
      .match_table = psc_ac97_match,
      .probe = psc_ac97_of_probe,
      .remove = __devexit_p(psc_ac97_of_remove),
      .driver = {
            .name = "mpc5200-psc-ac97",
            .owner = THIS_MODULE,
      },
};

/* ---------------------------------------------------------------------
 * Module setup and teardown; simply register the of_platform driver
 * for the PSC in AC97 mode.
 */
static int __init psc_ac97_init(void)
{
      return of_register_platform_driver(&psc_ac97_driver);
}
module_init(psc_ac97_init);

static void __exit psc_ac97_exit(void)
{
      of_unregister_platform_driver(&psc_ac97_driver);
}
module_exit(psc_ac97_exit);

MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
MODULE_DESCRIPTION("mpc5200 AC97 module");
MODULE_LICENSE("GPL");


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