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omap-mcbsp.c

/*
 * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
 *
 * Copyright (C) 2008 Nokia Corporation
 *
 * Contact: Jarkko Nikula <jarkko.nikula@nokia.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include <mach/control.h>
#include <mach/dma.h>
#include <mach/mcbsp.h>
#include "omap-mcbsp.h"
#include "omap-pcm.h"

#define OMAP_MCBSP_RATES      (SNDRV_PCM_RATE_44100 | \
                         SNDRV_PCM_RATE_48000 | \
                         SNDRV_PCM_RATE_KNOT)

struct omap_mcbsp_data {
      unsigned int                  bus_id;
      struct omap_mcbsp_reg_cfg     regs;
      unsigned int                  fmt;
      /*
       * Flags indicating is the bus already activated and configured by
       * another substream
       */
      int                     active;
      int                     configured;
};

#define to_mcbsp(priv)  container_of((priv), struct omap_mcbsp_data, bus_id)

static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];

/*
 * Stream DMA parameters. DMA request line and port address are set runtime
 * since they are different between OMAP1 and later OMAPs
 */
static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];

#if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
static const int omap1_dma_reqs[][2] = {
      { OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
      { OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
      { OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
};
static const unsigned long omap1_mcbsp_port[][2] = {
      { OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
        OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
      { OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
        OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
      { OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
        OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
};
#else
static const int omap1_dma_reqs[][2] = {};
static const unsigned long omap1_mcbsp_port[][2] = {};
#endif

#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
static const int omap24xx_dma_reqs[][2] = {
      { OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
      { OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
      { OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
      { OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
      { OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
#endif
};
#else
static const int omap24xx_dma_reqs[][2] = {};
#endif

#if defined(CONFIG_ARCH_OMAP2420)
static const unsigned long omap2420_mcbsp_port[][2] = {
      { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
        OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
      { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
        OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
};
#else
static const unsigned long omap2420_mcbsp_port[][2] = {};
#endif

#if defined(CONFIG_ARCH_OMAP2430)
static const unsigned long omap2430_mcbsp_port[][2] = {
      { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
        OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
        OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
        OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
        OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
        OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
};
#else
static const unsigned long omap2430_mcbsp_port[][2] = {};
#endif

#if defined(CONFIG_ARCH_OMAP34XX)
static const unsigned long omap34xx_mcbsp_port[][2] = {
      { OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
        OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
        OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
        OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
        OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
      { OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
        OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
};
#else
static const unsigned long omap34xx_mcbsp_port[][2] = {};
#endif

static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      int err = 0;

      if (!cpu_dai->active)
            err = omap_mcbsp_request(mcbsp_data->bus_id);

      return err;
}

static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);

      if (!cpu_dai->active) {
            omap_mcbsp_free(mcbsp_data->bus_id);
            mcbsp_data->configured = 0;
      }
}

static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      int err = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            if (!mcbsp_data->active++)
                  omap_mcbsp_start(mcbsp_data->bus_id);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            if (!--mcbsp_data->active)
                  omap_mcbsp_stop(mcbsp_data->bus_id);
            break;
      default:
            err = -EINVAL;
      }

      return err;
}

static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
      int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
      int wlen;
      unsigned long port;

      if (cpu_class_is_omap1()) {
            dma = omap1_dma_reqs[bus_id][substream->stream];
            port = omap1_mcbsp_port[bus_id][substream->stream];
      } else if (cpu_is_omap2420()) {
            dma = omap24xx_dma_reqs[bus_id][substream->stream];
            port = omap2420_mcbsp_port[bus_id][substream->stream];
      } else if (cpu_is_omap2430()) {
            dma = omap24xx_dma_reqs[bus_id][substream->stream];
            port = omap2430_mcbsp_port[bus_id][substream->stream];
      } else if (cpu_is_omap343x()) {
            dma = omap24xx_dma_reqs[bus_id][substream->stream];
            port = omap34xx_mcbsp_port[bus_id][substream->stream];
      } else {
            return -ENODEV;
      }
      omap_mcbsp_dai_dma_params[id][substream->stream].name =
            substream->stream ? "Audio Capture" : "Audio Playback";
      omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
      omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
      cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];

      if (mcbsp_data->configured) {
            /* McBSP already configured by another stream */
            return 0;
      }

      switch (params_channels(params)) {
      case 2:
            /* Set 1 word per (McBPSP) frame and use dual-phase frames */
            regs->rcr2  |= RFRLEN2(1 - 1) | RPHASE;
            regs->rcr1  |= RFRLEN1(1 - 1);
            regs->xcr2  |= XFRLEN2(1 - 1) | XPHASE;
            regs->xcr1  |= XFRLEN1(1 - 1);
            break;
      default:
            /* Unsupported number of channels */
            return -EINVAL;
      }

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            /* Set word lengths */
            wlen = 16;
            regs->rcr2  |= RWDLEN2(OMAP_MCBSP_WORD_16);
            regs->rcr1  |= RWDLEN1(OMAP_MCBSP_WORD_16);
            regs->xcr2  |= XWDLEN2(OMAP_MCBSP_WORD_16);
            regs->xcr1  |= XWDLEN1(OMAP_MCBSP_WORD_16);
            break;
      default:
            /* Unsupported PCM format */
            return -EINVAL;
      }

      /* Set FS period and length in terms of bit clock periods */
      switch (mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            regs->srgr2 |= FPER(wlen * 2 - 1);
            regs->srgr1 |= FWID(wlen - 1);
            break;
      case SND_SOC_DAIFMT_DSP_A:
            regs->srgr2 |= FPER(wlen * 2 - 1);
            regs->srgr1 |= FWID(wlen * 2 - 2);
            break;
      }

      omap_mcbsp_config(bus_id, &mcbsp_data->regs);
      mcbsp_data->configured = 1;

      return 0;
}

/*
 * This must be called before _set_clkdiv and _set_sysclk since McBSP register
 * cache is initialized here
 */
static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
                              unsigned int fmt)
{
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;

      if (mcbsp_data->configured)
            return 0;

      mcbsp_data->fmt = fmt;
      memset(regs, 0, sizeof(*regs));
      /* Generic McBSP register settings */
      regs->spcr2 |= XINTM(3) | FREE;
      regs->spcr1 |= RINTM(3);
      regs->rcr2  |= RFIG;
      regs->xcr2  |= XFIG;

      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            /* 1-bit data delay */
            regs->rcr2  |= RDATDLY(1);
            regs->xcr2  |= XDATDLY(1);
            break;
      case SND_SOC_DAIFMT_DSP_A:
            /* 0-bit data delay */
            regs->rcr2      |= RDATDLY(0);
            regs->xcr2      |= XDATDLY(0);
            break;
      default:
            /* Unsupported data format */
            return -EINVAL;
      }

      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBS_CFS:
            /* McBSP master. Set FS and bit clocks as outputs */
            regs->pcr0  |= FSXM | FSRM |
                           CLKXM | CLKRM;
            /* Sample rate generator drives the FS */
            regs->srgr2 |= FSGM;
            break;
      case SND_SOC_DAIFMT_CBM_CFM:
            /* McBSP slave */
            break;
      default:
            /* Unsupported master/slave configuration */
            return -EINVAL;
      }

      /* Set bit clock (CLKX/CLKR) and FS polarities */
      switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
      case SND_SOC_DAIFMT_NB_NF:
            /*
             * Normal BCLK + FS.
             * FS active low. TX data driven on falling edge of bit clock
             * and RX data sampled on rising edge of bit clock.
             */
            regs->pcr0  |= FSXP | FSRP |
                           CLKXP | CLKRP;
            break;
      case SND_SOC_DAIFMT_NB_IF:
            regs->pcr0  |= CLKXP | CLKRP;
            break;
      case SND_SOC_DAIFMT_IB_NF:
            regs->pcr0  |= FSXP | FSRP;
            break;
      case SND_SOC_DAIFMT_IB_IF:
            break;
      default:
            return -EINVAL;
      }

      return 0;
}

static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
                             int div_id, int div)
{
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;

      if (div_id != OMAP_MCBSP_CLKGDV)
            return -ENODEV;

      regs->srgr1 |= CLKGDV(div - 1);

      return 0;
}

static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
                               int clk_id)
{
      int sel_bit;
      u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;

      if (cpu_class_is_omap1()) {
            /* OMAP1's can use only external source clock */
            if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
                  return -EINVAL;
            else
                  return 0;
      }

      if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
            return -EINVAL;

      if (cpu_is_omap343x())
            reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;

      switch (mcbsp_data->bus_id) {
      case 0:
            reg = OMAP2_CONTROL_DEVCONF0;
            sel_bit = 2;
            break;
      case 1:
            reg = OMAP2_CONTROL_DEVCONF0;
            sel_bit = 6;
            break;
      case 2:
            reg = reg_devconf1;
            sel_bit = 0;
            break;
      case 3:
            reg = reg_devconf1;
            sel_bit = 2;
            break;
      case 4:
            reg = reg_devconf1;
            sel_bit = 4;
            break;
      default:
            return -EINVAL;
      }

      if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
            omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
      else
            omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);

      return 0;
}

static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
                               int clk_id, unsigned int freq,
                               int dir)
{
      struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
      struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
      int err = 0;

      switch (clk_id) {
      case OMAP_MCBSP_SYSCLK_CLK:
            regs->srgr2 |= CLKSM;
            break;
      case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
      case OMAP_MCBSP_SYSCLK_CLKS_EXT:
            err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
            break;

      case OMAP_MCBSP_SYSCLK_CLKX_EXT:
            regs->srgr2 |= CLKSM;
      case OMAP_MCBSP_SYSCLK_CLKR_EXT:
            regs->pcr0  |= SCLKME;
            break;
      default:
            err = -ENODEV;
      }

      return err;
}

#define OMAP_MCBSP_DAI_BUILDER(link_id)                     \
{                                               \
      .name = "omap-mcbsp-dai-(link_id)",             \
      .id = (link_id),                          \
      .type = SND_SOC_DAI_I2S,                        \
      .playback = {                                   \
            .channels_min = 2,                        \
            .channels_max = 2,                        \
            .rates = OMAP_MCBSP_RATES,                \
            .formats = SNDRV_PCM_FMTBIT_S16_LE,       \
      },                                        \
      .capture = {                                    \
            .channels_min = 2,                        \
            .channels_max = 2,                        \
            .rates = OMAP_MCBSP_RATES,                \
            .formats = SNDRV_PCM_FMTBIT_S16_LE,       \
      },                                        \
      .ops = {                                  \
            .startup = omap_mcbsp_dai_startup,        \
            .shutdown = omap_mcbsp_dai_shutdown,            \
            .trigger = omap_mcbsp_dai_trigger,        \
            .hw_params = omap_mcbsp_dai_hw_params,          \
      },                                        \
      .dai_ops = {                                    \
            .set_fmt = omap_mcbsp_dai_set_dai_fmt,          \
            .set_clkdiv = omap_mcbsp_dai_set_clkdiv,  \
            .set_sysclk = omap_mcbsp_dai_set_dai_sysclk,    \
      },                                        \
      .private_data = &mcbsp_data[(link_id)].bus_id,        \
}

struct snd_soc_dai omap_mcbsp_dai[] = {
      OMAP_MCBSP_DAI_BUILDER(0),
      OMAP_MCBSP_DAI_BUILDER(1),
#if NUM_LINKS >= 3
      OMAP_MCBSP_DAI_BUILDER(2),
#endif
#if NUM_LINKS == 5
      OMAP_MCBSP_DAI_BUILDER(3),
      OMAP_MCBSP_DAI_BUILDER(4),
#endif
};

EXPORT_SYMBOL_GPL(omap_mcbsp_dai);

MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
MODULE_DESCRIPTION("OMAP I2S SoC Interface");
MODULE_LICENSE("GPL");

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