LXR linux/sound/soc/fsl/mpc5200_psc

   1/*
   2 * Freescale MPC5200 PSC in I2S mode
   3 * ALSA SoC Digital Audio Interface (DAI) driver
   4 *
   5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
   6 * Copyright (C) 2009 Jon Smirl, Digispeaker
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/of_device.h>
  11#include <linux/of_platform.h>
  12
  13#include <sound/pcm.h>
  14#include <sound/pcm_params.h>
  15#include <sound/soc.h>
  16
  17#include <asm/mpc52xx_psc.h>
  18
  19#include "mpc5200_dma.h"
  20
  21/**
  22 * PSC_I2S_RATES: sample rates supported by the I2S
  23 *
  24 * This driver currently only supports the PSC running in I2S slave mode,
  25 * which means the codec determines the sample rate.  Therefore, we tell
  26 * ALSA that we support all rates and let the codec driver decide what rates
  27 * are really supported.
  28 */
  29#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
  30                        SNDRV_PCM_RATE_CONTINUOUS)
  31
  32/**
  33 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
  34 */
  35#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
  36                         SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
  37
  38static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
  39                                 struct snd_pcm_hw_params *params,
  40                                 struct snd_soc_dai *dai)
  41{
  42        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  43        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
  44        u32 mode;
  45
  46        dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
  47                " periods=%i buffer_size=%i  buffer_bytes=%i\n",
  48                __func__, substream, params_period_size(params),
  49                params_period_bytes(params), params_periods(params),
  50                params_buffer_size(params), params_buffer_bytes(params));
  51
  52        switch (params_format(params)) {
  53        case SNDRV_PCM_FORMAT_S8:
  54                mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
  55                break;
  56        case SNDRV_PCM_FORMAT_S16_BE:
  57                mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
  58                break;
  59        case SNDRV_PCM_FORMAT_S24_BE:
  60                mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
  61                break;
  62        case SNDRV_PCM_FORMAT_S32_BE:
  63                mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
  64                break;
  65        default:
  66                dev_dbg(psc_dma->dev, "invalid format\n");
  67                return -EINVAL;
  68        }
  69        out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
  70
  71        return 0;
  72}
  73
  74/**
  75 * psc_i2s_set_sysclk: set the clock frequency and direction
  76 *
  77 * This function is called by the machine driver to tell us what the clock
  78 * frequency and direction are.
  79 *
  80 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
  81 * and we don't care about the frequency.  Return an error if the direction
  82 * is not SND_SOC_CLOCK_IN.
  83 *
  84 * @clk_id: reserved, should be zero
  85 * @freq: the frequency of the given clock ID, currently ignored
  86 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
  87 */
  88static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
  89                              int clk_id, unsigned int freq, int dir)
  90{
  91        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
  92        dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
  93                                cpu_dai, dir);
  94        return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
  95}
  96
  97/**
  98 * psc_i2s_set_fmt: set the serial format.
  99 *
 100 * This function is called by the machine driver to tell us what serial
 101 * format to use.
 102 *
 103 * This driver only supports I2S mode.  Return an error if the format is
 104 * not SND_SOC_DAIFMT_I2S.
 105 *
 106 * @format: one of SND_SOC_DAIFMT_xxx
 107 */
 108static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
 109{
 110        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 111        dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
 112                                cpu_dai, format);
 113        return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
 114}
 115
 116/* ---------------------------------------------------------------------
 117 * ALSA SoC Bindings
 118 *
 119 * - Digital Audio Interface (DAI) template
 120 * - create/destroy dai hooks
 121 */
 122
 123/**
 124 * psc_i2s_dai_template: template CPU Digital Audio Interface
 125 */
 126static const struct snd_soc_dai_ops psc_i2s_dai_ops = {
 127        .hw_params      = psc_i2s_hw_params,
 128        .set_sysclk     = psc_i2s_set_sysclk,
 129        .set_fmt        = psc_i2s_set_fmt,
 130};
 131
 132static struct snd_soc_dai_driver psc_i2s_dai[] = {{
 133        .name = "mpc5200-psc-i2s.0",
 134        .playback = {
 135                .stream_name = "I2S Playback",
 136                .channels_min = 2,
 137                .channels_max = 2,
 138                .rates = PSC_I2S_RATES,
 139                .formats = PSC_I2S_FORMATS,
 140        },
 141        .capture = {
 142                .stream_name = "I2S Capture",
 143                .channels_min = 2,
 144                .channels_max = 2,
 145                .rates = PSC_I2S_RATES,
 146                .formats = PSC_I2S_FORMATS,
 147        },
 148        .ops = &psc_i2s_dai_ops,
 149} };
 150
 151/* ---------------------------------------------------------------------
 152 * OF platform bus binding code:
 153 * - Probe/remove operations
 154 * - OF device match table
 155 */
 156static int psc_i2s_of_probe(struct platform_device *op)
 157{
 158        int rc;
 159        struct psc_dma *psc_dma;
 160        struct mpc52xx_psc __iomem *regs;
 161
 162        rc = mpc5200_audio_dma_create(op);
 163        if (rc != 0)
 164                return rc;
 165
 166        rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
 167        if (rc != 0) {
 168                pr_err("Failed to register DAI\n");
 169                return rc;
 170        }
 171
 172        psc_dma = dev_get_drvdata(&op->dev);
 173        regs = psc_dma->psc_regs;
 174
 175        /* Configure the serial interface mode; defaulting to CODEC8 mode */
 176        psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
 177                        MPC52xx_PSC_SICR_CLKPOL;
 178        out_be32(&psc_dma->psc_regs->sicr,
 179                 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
 180
 181        /* Check for the codec handle.  If it is not present then we
 182         * are done */
 183        if (!of_get_property(op->dev.of_node, "codec-handle", NULL))
 184                return 0;
 185
 186        /* Due to errata in the dma mode; need to line up enabling
 187         * the transmitter with a transition on the frame sync
 188         * line */
 189
 190        /* first make sure it is low */
 191        while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
 192                ;
 193        /* then wait for the transition to high */
 194        while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
 195                ;
 196        /* Finally, enable the PSC.
 197         * Receiver must always be enabled; even when we only want
 198         * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
 199
 200        /* Go */
 201        out_8(&psc_dma->psc_regs->command,
 202                        MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 203
 204        return 0;
 205
 206}
 207
 208static int psc_i2s_of_remove(struct platform_device *op)
 209{
 210        mpc5200_audio_dma_destroy(op);
 211        snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai));
 212        return 0;
 213}
 214
 215/* Match table for of_platform binding */
 216static struct of_device_id psc_i2s_match[] = {
 217        { .compatible = "fsl,mpc5200-psc-i2s", },
 218        { .compatible = "fsl,mpc5200b-psc-i2s", },
 219        {}
 220};
 221MODULE_DEVICE_TABLE(of, psc_i2s_match);
 222
 223static struct platform_driver psc_i2s_driver = {
 224        .probe = psc_i2s_of_probe,
 225        .remove = psc_i2s_of_remove,
 226        .driver = {
 227                .name = "mpc5200-psc-i2s",
 228                .owner = THIS_MODULE,
 229                .of_match_table = psc_i2s_match,
 230        },
 231};
 232
 233module_platform_driver(psc_i2s_driver);
 234
 235MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
 236MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
 237MODULE_LICENSE("GPL");
 238
 239