sound/soc/fsl/mpc5200_psc_ac97.c

   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
  16 #include <sound/pcm.h>
  17 #include <sound/pcm_params.h>
  18 #include <sound/soc.h>
  19
  20 #include <asm/time.h>
  21 #include <asm/delay.h>
  22 #include <asm/mpc52xx_psc.h>
  23
  24 #include "mpc5200_dma.h"
  25 #include "mpc5200_psc_ac97.h"
  26
  27 #define DRV_NAME "mpc5200-psc-ac97"
  28
  29 /* ALSA only supports a single AC97 device so static is recommend here */
  30 static struct psc_dma *psc_dma;
  31
  32 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  33 {
  34         int status;
  35         unsigned int val;
  36
  37         mutex_lock(&psc_dma->mutex);
  38
  39         /* Wait for command send status zero = ready */
  40         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  41                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  42         if (status == 0) {
  43                 pr_err("timeout on ac97 bus (rdy)\n");
  44                 mutex_unlock(&psc_dma->mutex);
  45                 return -ENODEV;
  46         }
  47
  48         /* Force clear the data valid bit */
  49         in_be32(&psc_dma->psc_regs->ac97_data);
  50
  51         /* Send the read */
  52         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
  53
  54         /* Wait for the answer */
  55         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
  56                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
  57         if (status == 0) {
  58                 pr_err("timeout on ac97 read (val) %x\n",
  59                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
  60                 mutex_unlock(&psc_dma->mutex);
  61                 return -ENODEV;
  62         }
  63         /* Get the data */
  64         val = in_be32(&psc_dma->psc_regs->ac97_data);
  65         if (((val >> 24) & 0x7f) != reg) {
  66                 pr_err("reg echo error on ac97 read\n");
  67                 mutex_unlock(&psc_dma->mutex);
  68                 return -ENODEV;
  69         }
  70         val = (val >> 8) & 0xffff;
  71
  72         mutex_unlock(&psc_dma->mutex);
  73         return (unsigned short) val;
  74 }
  75
  76 static void psc_ac97_write(struct snd_ac97 *ac97,
  77                                 unsigned short reg, unsigned short val)
  78 {
  79         int status;
  80
  81         mutex_lock(&psc_dma->mutex);
  82
  83         /* Wait for command status zero = ready */
  84         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  85                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  86         if (status == 0) {
  87                 pr_err("timeout on ac97 bus (write)\n");
  88                 goto out;
  89         }
  90         /* Write data */
  91         out_be32(&psc_dma->psc_regs->ac97_cmd,
  92                         ((reg & 0x7f) << 24) | (val << 8));
  93
  94  out:
  95         mutex_unlock(&psc_dma->mutex);
  96 }
  97
  98 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
  99 {
 100         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 101
 102         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 103         udelay(3);
 104         out_be32(&regs->sicr, psc_dma->sicr);
 105 }
 106
 107 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 108 {
 109         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 110
 111         /* Do a cold reset */
 112         out_8(&regs->op1, MPC52xx_PSC_OP_RES);
 113         udelay(10);
 114         out_8(&regs->op0, MPC52xx_PSC_OP_RES);
 115         udelay(50);
 116         psc_ac97_warm_reset(ac97);
 117 }
 118
 119 struct snd_ac97_bus_ops soc_ac97_ops = {
 120         .read           = psc_ac97_read,
 121         .write          = psc_ac97_write,
 122         .reset          = psc_ac97_cold_reset,
 123         .warm_reset     = psc_ac97_warm_reset,
 124 };
 125 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 126
 127 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 128                                  struct snd_pcm_hw_params *params,
 129                                  struct snd_soc_dai *cpu_dai)
 130 {
 131         struct psc_dma *psc_dma = cpu_dai->private_data;
 132
 133         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 134                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 135                 " rate=%i format=%i\n",
 136                 __func__, substream, params_period_size(params),
 137                 params_period_bytes(params), params_periods(params),
 138                 params_buffer_size(params), params_buffer_bytes(params),
 139                 params_channels(params), params_rate(params),
 140                 params_format(params));
 141
 142
 143         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
 144                 if (params_channels(params) == 1)
 145                         psc_dma->slots |= 0x00000100;
 146                 else
 147                         psc_dma->slots |= 0x00000300;
 148         } else {
 149                 if (params_channels(params) == 1)
 150                         psc_dma->slots |= 0x01000000;
 151                 else
 152                         psc_dma->slots |= 0x03000000;
 153         }
 154         out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 155
 156         return 0;
 157 }
 158
 159 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 160                                  struct snd_pcm_hw_params *params,
 161                                  struct snd_soc_dai *cpu_dai)
 162 {
 163         struct psc_dma *psc_dma = cpu_dai->private_data;
 164
 165         if (params_channels(params) == 1)
 166                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 167         else
 168                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
 169
 170         return 0;
 171 }
 172
 173 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 174                                                         struct snd_soc_dai *dai)
 175 {
 176         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 177         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 178
 179         switch (cmd) {
 180         case SNDRV_PCM_TRIGGER_STOP:
 181                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 182                         psc_dma->slots &= 0xFFFF0000;
 183                 else
 184                         psc_dma->slots &= 0x0000FFFF;
 185
 186                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 187                 break;
 188         }
 189         return 0;
 190 }
 191
 192 static int psc_ac97_probe(struct platform_device *pdev,
 193                                         struct snd_soc_dai *cpu_dai)
 194 {
 195         struct psc_dma *psc_dma = cpu_dai->private_data;
 196         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 197
 198         /* Go */
 199         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 200         return 0;
 201 }
 202
 203 /* ---------------------------------------------------------------------
 204  * ALSA SoC Bindings
 205  *
 206  * - Digital Audio Interface (DAI) template
 207  * - create/destroy dai hooks
 208  */
 209
 210 /**
 211  * psc_ac97_dai_template: template CPU Digital Audio Interface
 212  */
 213 static struct snd_soc_dai_ops psc_ac97_analog_ops = {
 214         .hw_params      = psc_ac97_hw_analog_params,
 215         .trigger        = psc_ac97_trigger,
 216 };
 217
 218 static struct snd_soc_dai_ops psc_ac97_digital_ops = {
 219         .hw_params      = psc_ac97_hw_digital_params,
 220 };
 221
 222 struct snd_soc_dai psc_ac97_dai[] = {
 223 {
 224         .name   = "AC97",
 225         .ac97_control = 1,
 226         .probe  = psc_ac97_probe,
 227         .playback = {
 228                 .channels_min   = 1,
 229                 .channels_max   = 6,
 230                 .rates          = SNDRV_PCM_RATE_8000_48000,
 231                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 232         },
 233         .capture = {
 234                 .channels_min   = 1,
 235                 .channels_max   = 2,
 236                 .rates          = SNDRV_PCM_RATE_8000_48000,
 237                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 238         },
 239         .ops = &psc_ac97_analog_ops,
 240 },
 241 {
 242         .name   = "SPDIF",
 243         .ac97_control = 1,
 244         .playback = {
 245                 .channels_min   = 1,
 246                 .channels_max   = 2,
 247                 .rates          = SNDRV_PCM_RATE_32000 | \
 248                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 249                 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 250         },
 251         .ops = &psc_ac97_digital_ops,
 252 } };
 253 EXPORT_SYMBOL_GPL(psc_ac97_dai);
 254
 255
 256
 257 /* ---------------------------------------------------------------------
 258  * OF platform bus binding code:
 259  * - Probe/remove operations
 260  * - OF device match table
 261  */
 262 static int __devinit psc_ac97_of_probe(struct of_device *op,
 263                                       const struct of_device_id *match)
 264 {
 265         int rc, i;
 266         struct snd_ac97 ac97;
 267         struct mpc52xx_psc __iomem *regs;
 268
 269         rc = mpc5200_audio_dma_create(op);
 270         if (rc != 0)
 271                 return rc;
 272
 273         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
 274                 psc_ac97_dai[i].dev = &op->dev;
 275
 276         rc = snd_soc_register_dais(psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 277         if (rc != 0) {
 278                 dev_err(&op->dev, "Failed to register DAI\n");
 279                 return rc;
 280         }
 281
 282         psc_dma = dev_get_drvdata(&op->dev);
 283         regs = psc_dma->psc_regs;
 284         ac97.private_data = psc_dma;
 285
 286         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
 287                 psc_ac97_dai[i].private_data = psc_dma;
 288
 289         psc_dma->imr = 0;
 290         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 291
 292         /* Configure the serial interface mode to AC97 */
 293         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 294         out_be32(&regs->sicr, psc_dma->sicr);
 295
 296         /* No slots active */
 297         out_be32(&regs->ac97_slots, 0x00000000);
 298
 299         return 0;
 300 }
 301
 302 static int __devexit psc_ac97_of_remove(struct of_device *op)
 303 {
 304         return mpc5200_audio_dma_destroy(op);
 305 }
 306
 307 /* Match table for of_platform binding */
 308 static struct of_device_id psc_ac97_match[] __devinitdata = {
 309         { .compatible = "fsl,mpc5200-psc-ac97", },
 310         { .compatible = "fsl,mpc5200b-psc-ac97", },
 311         {}
 312 };
 313 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 314
 315 static struct of_platform_driver psc_ac97_driver = {
 316         .match_table = psc_ac97_match,
 317         .probe = psc_ac97_of_probe,
 318         .remove = __devexit_p(psc_ac97_of_remove),
 319         .driver = {
 320                 .name = "mpc5200-psc-ac97",
 321                 .owner = THIS_MODULE,
 322         },
 323 };
 324
 325 /* ---------------------------------------------------------------------
 326  * Module setup and teardown; simply register the of_platform driver
 327  * for the PSC in AC97 mode.
 328  */
 329 static int __init psc_ac97_init(void)
 330 {
 331         return of_register_platform_driver(&psc_ac97_driver);
 332 }
 333 module_init(psc_ac97_init);
 334
 335 static void __exit psc_ac97_exit(void)
 336 {
 337         of_unregister_platform_driver(&psc_ac97_driver);
 338 }
 339 module_exit(psc_ac97_exit);
 340
 341 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 342 MODULE_DESCRIPTION("mpc5200 AC97 module");
 343 MODULE_LICENSE("GPL");
 344