linux/sound/soc/fsl/mpc5200_psc_ac97.c
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   1/*
   2 * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
   3 *
   4 * Copyright (C) 2009 Jon Smirl, Digispeaker
   5 * Author: Jon Smirl <jonsmirl@gmail.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/of_device.h>
  14#include <linux/of_platform.h>
  15#include <linux/delay.h>
  16#include <linux/time.h>
  17
  18#include <sound/pcm.h>
  19#include <sound/pcm_params.h>
  20#include <sound/soc.h>
  21
  22#include <asm/time.h>
  23#include <asm/delay.h>
  24#include <asm/mpc52xx.h>
  25#include <asm/mpc52xx_psc.h>
  26
  27#include "mpc5200_dma.h"
  28
  29#define DRV_NAME "mpc5200-psc-ac97"
  30
  31/* ALSA only supports a single AC97 device so static is recommend here */
  32static struct psc_dma *psc_dma;
  33
  34static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  35{
  36        int status;
  37        unsigned int val;
  38
  39        mutex_lock(&psc_dma->mutex);
  40
  41        /* Wait for command send status zero = ready */
  42        status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  43                                MPC52xx_PSC_SR_CMDSEND), 100, 0);
  44        if (status == 0) {
  45                pr_err("timeout on ac97 bus (rdy)\n");
  46                mutex_unlock(&psc_dma->mutex);
  47                return -ENODEV;
  48        }
  49
  50        /* Force clear the data valid bit */
  51        in_be32(&psc_dma->psc_regs->ac97_data);
  52
  53        /* Send the read */
  54        out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
  55
  56        /* Wait for the answer */
  57        status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
  58                                MPC52xx_PSC_SR_DATA_VAL), 100, 0);
  59        if (status == 0) {
  60                pr_err("timeout on ac97 read (val) %x\n",
  61                                in_be16(&psc_dma->psc_regs->sr_csr.status));
  62                mutex_unlock(&psc_dma->mutex);
  63                return -ENODEV;
  64        }
  65        /* Get the data */
  66        val = in_be32(&psc_dma->psc_regs->ac97_data);
  67        if (((val >> 24) & 0x7f) != reg) {
  68                pr_err("reg echo error on ac97 read\n");
  69                mutex_unlock(&psc_dma->mutex);
  70                return -ENODEV;
  71        }
  72        val = (val >> 8) & 0xffff;
  73
  74        mutex_unlock(&psc_dma->mutex);
  75        return (unsigned short) val;
  76}
  77
  78static void psc_ac97_write(struct snd_ac97 *ac97,
  79                                unsigned short reg, unsigned short val)
  80{
  81        int status;
  82
  83        mutex_lock(&psc_dma->mutex);
  84
  85        /* Wait for command status zero = ready */
  86        status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  87                                MPC52xx_PSC_SR_CMDSEND), 100, 0);
  88        if (status == 0) {
  89                pr_err("timeout on ac97 bus (write)\n");
  90                goto out;
  91        }
  92        /* Write data */
  93        out_be32(&psc_dma->psc_regs->ac97_cmd,
  94                        ((reg & 0x7f) << 24) | (val << 8));
  95
  96 out:
  97        mutex_unlock(&psc_dma->mutex);
  98}
  99
 100static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
 101{
 102        struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 103
 104        mutex_lock(&psc_dma->mutex);
 105
 106        out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 107        udelay(3);
 108        out_be32(&regs->sicr, psc_dma->sicr);
 109
 110        mutex_unlock(&psc_dma->mutex);
 111}
 112
 113static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 114{
 115        struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 116
 117        mutex_lock(&psc_dma->mutex);
 118        dev_dbg(psc_dma->dev, "cold reset\n");
 119
 120        mpc5200_psc_ac97_gpio_reset(psc_dma->id);
 121
 122        /* Notify the PSC that a reset has occurred */
 123        out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
 124
 125        /* Re-enable RX and TX */
 126        out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 127
 128        mutex_unlock(&psc_dma->mutex);
 129
 130        usleep_range(1000, 2000);
 131        psc_ac97_warm_reset(ac97);
 132}
 133
 134static struct snd_ac97_bus_ops psc_ac97_ops = {
 135        .read           = psc_ac97_read,
 136        .write          = psc_ac97_write,
 137        .reset          = psc_ac97_cold_reset,
 138        .warm_reset     = psc_ac97_warm_reset,
 139};
 140
 141static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 142                                 struct snd_pcm_hw_params *params,
 143                                 struct snd_soc_dai *cpu_dai)
 144{
 145        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 146        struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 147
 148        dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 149                " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 150                " rate=%i format=%i\n",
 151                __func__, substream, params_period_size(params),
 152                params_period_bytes(params), params_periods(params),
 153                params_buffer_size(params), params_buffer_bytes(params),
 154                params_channels(params), params_rate(params),
 155                params_format(params));
 156
 157        /* Determine the set of enable bits to turn on */
 158        s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
 159        if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
 160                s->ac97_slot_bits <<= 16;
 161        return 0;
 162}
 163
 164static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 165                                 struct snd_pcm_hw_params *params,
 166                                 struct snd_soc_dai *cpu_dai)
 167{
 168        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 169
 170        dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
 171
 172        if (params_channels(params) == 1)
 173                out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 174        else
 175                out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
 176
 177        return 0;
 178}
 179
 180static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 181                                                        struct snd_soc_dai *dai)
 182{
 183        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
 184        struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 185
 186        switch (cmd) {
 187        case SNDRV_PCM_TRIGGER_START:
 188                dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 189                        substream->pstr->stream);
 190
 191                /* Set the slot enable bits */
 192                psc_dma->slots |= s->ac97_slot_bits;
 193                out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 194                break;
 195
 196        case SNDRV_PCM_TRIGGER_STOP:
 197                dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 198                        substream->pstr->stream);
 199
 200                /* Clear the slot enable bits */
 201                psc_dma->slots &= ~(s->ac97_slot_bits);
 202                out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 203                break;
 204        }
 205        return 0;
 206}
 207
 208static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
 209{
 210        struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 211        struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 212
 213        /* Go */
 214        out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 215        return 0;
 216}
 217
 218/* ---------------------------------------------------------------------
 219 * ALSA SoC Bindings
 220 *
 221 * - Digital Audio Interface (DAI) template
 222 * - create/destroy dai hooks
 223 */
 224
 225/**
 226 * psc_ac97_dai_template: template CPU Digital Audio Interface
 227 */
 228static const struct snd_soc_dai_ops psc_ac97_analog_ops = {
 229        .hw_params      = psc_ac97_hw_analog_params,
 230        .trigger        = psc_ac97_trigger,
 231};
 232
 233static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
 234        .hw_params      = psc_ac97_hw_digital_params,
 235};
 236
 237static struct snd_soc_dai_driver psc_ac97_dai[] = {
 238{
 239        .name = "mpc5200-psc-ac97.0",
 240        .bus_control = true,
 241        .probe  = psc_ac97_probe,
 242        .playback = {
 243                .stream_name    = "AC97 Playback",
 244                .channels_min   = 1,
 245                .channels_max   = 6,
 246                .rates          = SNDRV_PCM_RATE_8000_48000,
 247                .formats = SNDRV_PCM_FMTBIT_S32_BE,
 248        },
 249        .capture = {
 250                .stream_name    = "AC97 Capture",
 251                .channels_min   = 1,
 252                .channels_max   = 2,
 253                .rates          = SNDRV_PCM_RATE_8000_48000,
 254                .formats = SNDRV_PCM_FMTBIT_S32_BE,
 255        },
 256        .ops = &psc_ac97_analog_ops,
 257},
 258{
 259        .name = "mpc5200-psc-ac97.1",
 260        .bus_control = true,
 261        .playback = {
 262                .stream_name    = "AC97 SPDIF",
 263                .channels_min   = 1,
 264                .channels_max   = 2,
 265                .rates          = SNDRV_PCM_RATE_32000 | \
 266                        SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 267                .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 268        },
 269        .ops = &psc_ac97_digital_ops,
 270} };
 271
 272static const struct snd_soc_component_driver psc_ac97_component = {
 273        .name           = DRV_NAME,
 274};
 275
 276
 277/* ---------------------------------------------------------------------
 278 * OF platform bus binding code:
 279 * - Probe/remove operations
 280 * - OF device match table
 281 */
 282static int psc_ac97_of_probe(struct platform_device *op)
 283{
 284        int rc;
 285        struct mpc52xx_psc __iomem *regs;
 286
 287        rc = mpc5200_audio_dma_create(op);
 288        if (rc != 0)
 289                return rc;
 290
 291        rc = snd_soc_set_ac97_ops(&psc_ac97_ops);
 292        if (rc != 0) {
 293                dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc);
 294                return rc;
 295        }
 296
 297        rc = snd_soc_register_component(&op->dev, &psc_ac97_component,
 298                                        psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 299        if (rc != 0) {
 300                dev_err(&op->dev, "Failed to register DAI\n");
 301                return rc;
 302        }
 303
 304        psc_dma = dev_get_drvdata(&op->dev);
 305        regs = psc_dma->psc_regs;
 306
 307        psc_dma->imr = 0;
 308        out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 309
 310        /* Configure the serial interface mode to AC97 */
 311        psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 312        out_be32(&regs->sicr, psc_dma->sicr);
 313
 314        /* No slots active */
 315        out_be32(&regs->ac97_slots, 0x00000000);
 316
 317        return 0;
 318}
 319
 320static int psc_ac97_of_remove(struct platform_device *op)
 321{
 322        mpc5200_audio_dma_destroy(op);
 323        snd_soc_unregister_component(&op->dev);
 324        snd_soc_set_ac97_ops(NULL);
 325        return 0;
 326}
 327
 328/* Match table for of_platform binding */
 329static const struct of_device_id psc_ac97_match[] = {
 330        { .compatible = "fsl,mpc5200-psc-ac97", },
 331        { .compatible = "fsl,mpc5200b-psc-ac97", },
 332        {}
 333};
 334MODULE_DEVICE_TABLE(of, psc_ac97_match);
 335
 336static struct platform_driver psc_ac97_driver = {
 337        .probe = psc_ac97_of_probe,
 338        .remove = psc_ac97_of_remove,
 339        .driver = {
 340                .name = "mpc5200-psc-ac97",
 341                .of_match_table = psc_ac97_match,
 342        },
 343};
 344
 345module_platform_driver(psc_ac97_driver);
 346
 347MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 348MODULE_DESCRIPTION("mpc5200 AC97 module");
 349MODULE_LICENSE("GPL");
 350
 351