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 #include <linux/delay.h>
  16
  17 #include <sound/pcm.h>
  18 #include <sound/pcm_params.h>
  19 #include <sound/soc.h>
  20
  21 #include <asm/time.h>
  22 #include <asm/delay.h>
  23 #include <asm/mpc52xx_psc.h>
  24
  25 #include "mpc5200_dma.h"
  26 #include "mpc5200_psc_ac97.h"
  27
  28 #define DRV_NAME "mpc5200-psc-ac97"
  29
  30 /* ALSA only supports a single AC97 device so static is recommend here */
  31 static struct psc_dma *psc_dma;
  32
  33 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  34 {
  35         int status;
  36         unsigned int val;
  37
  38         mutex_lock(&psc_dma->mutex);
  39
  40         /* Wait for command send status zero = ready */
  41         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  42                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  43         if (status == 0) {
  44                 pr_err("timeout on ac97 bus (rdy)\n");
  45                 mutex_unlock(&psc_dma->mutex);
  46                 return -ENODEV;
  47         }
  48
  49         /* Force clear the data valid bit */
  50         in_be32(&psc_dma->psc_regs->ac97_data);
  51
  52         /* Send the read */
  53         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
  54
  55         /* Wait for the answer */
  56         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
  57                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
  58         if (status == 0) {
  59                 pr_err("timeout on ac97 read (val) %x\n",
  60                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
  61                 mutex_unlock(&psc_dma->mutex);
  62                 return -ENODEV;
  63         }
  64         /* Get the data */
  65         val = in_be32(&psc_dma->psc_regs->ac97_data);
  66         if (((val >> 24) & 0x7f) != reg) {
  67                 pr_err("reg echo error on ac97 read\n");
  68                 mutex_unlock(&psc_dma->mutex);
  69                 return -ENODEV;
  70         }
  71         val = (val >> 8) & 0xffff;
  72
  73         mutex_unlock(&psc_dma->mutex);
  74         return (unsigned short) val;
  75 }
  76
  77 static void psc_ac97_write(struct snd_ac97 *ac97,
  78                                 unsigned short reg, unsigned short val)
  79 {
  80         int status;
  81
  82         mutex_lock(&psc_dma->mutex);
  83
  84         /* Wait for command status zero = ready */
  85         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  86                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  87         if (status == 0) {
  88                 pr_err("timeout on ac97 bus (write)\n");
  89                 goto out;
  90         }
  91         /* Write data */
  92         out_be32(&psc_dma->psc_regs->ac97_cmd,
  93                         ((reg & 0x7f) << 24) | (val << 8));
  94
  95  out:
  96         mutex_unlock(&psc_dma->mutex);
  97 }
  98
  99 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
 100 {
 101         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 102
 103         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 104         udelay(3);
 105         out_be32(&regs->sicr, psc_dma->sicr);
 106 }
 107
 108 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 109 {
 110         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 111
 112         /* Do a cold reset */
 113         out_8(&regs->op1, MPC52xx_PSC_OP_RES);
 114         udelay(10);
 115         out_8(&regs->op0, MPC52xx_PSC_OP_RES);
 116         msleep(1);
 117         psc_ac97_warm_reset(ac97);
 118 }
 119
 120 struct snd_ac97_bus_ops soc_ac97_ops = {
 121         .read           = psc_ac97_read,
 122         .write          = psc_ac97_write,
 123         .reset          = psc_ac97_cold_reset,
 124         .warm_reset     = psc_ac97_warm_reset,
 125 };
 126 EXPORT_SYMBOL_GPL(soc_ac97_ops);
 127
 128 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 129                                  struct snd_pcm_hw_params *params,
 130                                  struct snd_soc_dai *cpu_dai)
 131 {
 132         struct psc_dma *psc_dma = cpu_dai->private_data;
 133         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 134
 135         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 136                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 137                 " rate=%i format=%i\n",
 138                 __func__, substream, params_period_size(params),
 139                 params_period_bytes(params), params_periods(params),
 140                 params_buffer_size(params), params_buffer_bytes(params),
 141                 params_channels(params), params_rate(params),
 142                 params_format(params));
 143
 144         /* Determine the set of enable bits to turn on */
 145         s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
 146         if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
 147                 s->ac97_slot_bits <<= 16;
 148         return 0;
 149 }
 150
 151 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 152                                  struct snd_pcm_hw_params *params,
 153                                  struct snd_soc_dai *cpu_dai)
 154 {
 155         struct psc_dma *psc_dma = cpu_dai->private_data;
 156
 157         dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
 158
 159         if (params_channels(params) == 1)
 160                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 161         else
 162                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
 163
 164         return 0;
 165 }
 166
 167 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 168                                                         struct snd_soc_dai *dai)
 169 {
 170         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 171         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 172         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 173
 174         switch (cmd) {
 175         case SNDRV_PCM_TRIGGER_START:
 176                 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 177                         substream->pstr->stream);
 178
 179                 /* Set the slot enable bits */
 180                 psc_dma->slots |= s->ac97_slot_bits;
 181                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 182                 break;
 183
 184         case SNDRV_PCM_TRIGGER_STOP:
 185                 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 186                         substream->pstr->stream);
 187
 188                 /* Clear the slot enable bits */
 189                 psc_dma->slots &= ~(s->ac97_slot_bits);
 190                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 191                 break;
 192         }
 193         return 0;
 194 }
 195
 196 static int psc_ac97_probe(struct platform_device *pdev,
 197                                         struct snd_soc_dai *cpu_dai)
 198 {
 199         struct psc_dma *psc_dma = cpu_dai->private_data;
 200         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 201
 202         /* Go */
 203         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 204         return 0;
 205 }
 206
 207 /* ---------------------------------------------------------------------
 208  * ALSA SoC Bindings
 209  *
 210  * - Digital Audio Interface (DAI) template
 211  * - create/destroy dai hooks
 212  */
 213
 214 /**
 215  * psc_ac97_dai_template: template CPU Digital Audio Interface
 216  */
 217 static struct snd_soc_dai_ops psc_ac97_analog_ops = {
 218         .hw_params      = psc_ac97_hw_analog_params,
 219         .trigger        = psc_ac97_trigger,
 220 };
 221
 222 static struct snd_soc_dai_ops psc_ac97_digital_ops = {
 223         .hw_params      = psc_ac97_hw_digital_params,
 224 };
 225
 226 struct snd_soc_dai psc_ac97_dai[] = {
 227 {
 228         .name   = "AC97",
 229         .ac97_control = 1,
 230         .probe  = psc_ac97_probe,
 231         .playback = {
 232                 .channels_min   = 1,
 233                 .channels_max   = 6,
 234                 .rates          = SNDRV_PCM_RATE_8000_48000,
 235                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 236         },
 237         .capture = {
 238                 .channels_min   = 1,
 239                 .channels_max   = 2,
 240                 .rates          = SNDRV_PCM_RATE_8000_48000,
 241                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 242         },
 243         .ops = &psc_ac97_analog_ops,
 244 },
 245 {
 246         .name   = "SPDIF",
 247         .ac97_control = 1,
 248         .playback = {
 249                 .channels_min   = 1,
 250                 .channels_max   = 2,
 251                 .rates          = SNDRV_PCM_RATE_32000 | \
 252                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 253                 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 254         },
 255         .ops = &psc_ac97_digital_ops,
 256 } };
 257 EXPORT_SYMBOL_GPL(psc_ac97_dai);
 258
 259
 260
 261 /* ---------------------------------------------------------------------
 262  * OF platform bus binding code:
 263  * - Probe/remove operations
 264  * - OF device match table
 265  */
 266 static int __devinit psc_ac97_of_probe(struct of_device *op,
 267                                       const struct of_device_id *match)
 268 {
 269         int rc, i;
 270         struct snd_ac97 ac97;
 271         struct mpc52xx_psc __iomem *regs;
 272
 273         rc = mpc5200_audio_dma_create(op);
 274         if (rc != 0)
 275                 return rc;
 276
 277         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
 278                 psc_ac97_dai[i].dev = &op->dev;
 279
 280         rc = snd_soc_register_dais(psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 281         if (rc != 0) {
 282                 dev_err(&op->dev, "Failed to register DAI\n");
 283                 return rc;
 284         }
 285
 286         psc_dma = dev_get_drvdata(&op->dev);
 287         regs = psc_dma->psc_regs;
 288         ac97.private_data = psc_dma;
 289
 290         for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++)
 291                 psc_ac97_dai[i].private_data = psc_dma;
 292
 293         psc_dma->imr = 0;
 294         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 295
 296         /* Configure the serial interface mode to AC97 */
 297         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 298         out_be32(&regs->sicr, psc_dma->sicr);
 299
 300         /* No slots active */
 301         out_be32(&regs->ac97_slots, 0x00000000);
 302
 303         return 0;
 304 }
 305
 306 static int __devexit psc_ac97_of_remove(struct of_device *op)
 307 {
 308         return mpc5200_audio_dma_destroy(op);
 309 }
 310
 311 /* Match table for of_platform binding */
 312 static struct of_device_id psc_ac97_match[] __devinitdata = {
 313         { .compatible = "fsl,mpc5200-psc-ac97", },
 314         { .compatible = "fsl,mpc5200b-psc-ac97", },
 315         {}
 316 };
 317 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 318
 319 static struct of_platform_driver psc_ac97_driver = {
 320         .probe = psc_ac97_of_probe,
 321         .remove = __devexit_p(psc_ac97_of_remove),
 322         .driver = {
 323                 .name = "mpc5200-psc-ac97",
 324                 .owner = THIS_MODULE,
 325                 .of_match_table = psc_ac97_match,
 326         },
 327 };
 328
 329 /* ---------------------------------------------------------------------
 330  * Module setup and teardown; simply register the of_platform driver
 331  * for the PSC in AC97 mode.
 332  */
 333 static int __init psc_ac97_init(void)
 334 {
 335         return of_register_platform_driver(&psc_ac97_driver);
 336 }
 337 module_init(psc_ac97_init);
 338
 339 static void __exit psc_ac97_exit(void)
 340 {
 341         of_unregister_platform_driver(&psc_ac97_driver);
 342 }
 343 module_exit(psc_ac97_exit);
 344
 345 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 346 MODULE_DESCRIPTION("mpc5200 AC97 module");
 347 MODULE_LICENSE("GPL");
 348