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 = snd_soc_dai_get_drvdata(cpu_dai);
 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 = snd_soc_dai_get_drvdata(cpu_dai);
 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 psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
 171         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 172
 173         switch (cmd) {
 174         case SNDRV_PCM_TRIGGER_START:
 175                 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 176                         substream->pstr->stream);
 177
 178                 /* Set the slot enable bits */
 179                 psc_dma->slots |= s->ac97_slot_bits;
 180                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 181                 break;
 182
 183         case SNDRV_PCM_TRIGGER_STOP:
 184                 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 185                         substream->pstr->stream);
 186
 187                 /* Clear the slot enable bits */
 188                 psc_dma->slots &= ~(s->ac97_slot_bits);
 189                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 190                 break;
 191         }
 192         return 0;
 193 }
 194
 195 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
 196 {
 197         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 198         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 199
 200         /* Go */
 201         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 202         return 0;
 203 }
 204
 205 /* ---------------------------------------------------------------------
 206  * ALSA SoC Bindings
 207  *
 208  * - Digital Audio Interface (DAI) template
 209  * - create/destroy dai hooks
 210  */
 211
 212 /**
 213  * psc_ac97_dai_template: template CPU Digital Audio Interface
 214  */
 215 static struct snd_soc_dai_ops psc_ac97_analog_ops = {
 216         .hw_params      = psc_ac97_hw_analog_params,
 217         .trigger        = psc_ac97_trigger,
 218 };
 219
 220 static struct snd_soc_dai_ops psc_ac97_digital_ops = {
 221         .hw_params      = psc_ac97_hw_digital_params,
 222 };
 223
 224 static struct snd_soc_dai_driver psc_ac97_dai[] = {
 225 {
 226         .ac97_control = 1,
 227         .probe  = psc_ac97_probe,
 228         .playback = {
 229                 .channels_min   = 1,
 230                 .channels_max   = 6,
 231                 .rates          = SNDRV_PCM_RATE_8000_48000,
 232                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 233         },
 234         .capture = {
 235                 .channels_min   = 1,
 236                 .channels_max   = 2,
 237                 .rates          = SNDRV_PCM_RATE_8000_48000,
 238                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 239         },
 240         .ops = &psc_ac97_analog_ops,
 241 },
 242 {
 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
 254
 255
 256 /* ---------------------------------------------------------------------
 257  * OF platform bus binding code:
 258  * - Probe/remove operations
 259  * - OF device match table
 260  */
 261 static int __devinit psc_ac97_of_probe(struct of_device *op,
 262                                       const struct of_device_id *match)
 263 {
 264         int rc;
 265         struct snd_ac97 ac97;
 266         struct mpc52xx_psc __iomem *regs;
 267
 268         rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 269         if (rc != 0) {
 270                 dev_err(&op->dev, "Failed to register DAI\n");
 271                 return rc;
 272         }
 273
 274         psc_dma = dev_get_drvdata(&op->dev);
 275         regs = psc_dma->psc_regs;
 276         ac97.private_data = psc_dma;
 277
 278         psc_dma->imr = 0;
 279         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 280
 281         /* Configure the serial interface mode to AC97 */
 282         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 283         out_be32(&regs->sicr, psc_dma->sicr);
 284
 285         /* No slots active */
 286         out_be32(&regs->ac97_slots, 0x00000000);
 287
 288         return 0;
 289 }
 290
 291 static int __devexit psc_ac97_of_remove(struct of_device *op)
 292 {
 293         snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai));
 294         return 0;
 295 }
 296
 297 /* Match table for of_platform binding */
 298 static struct of_device_id psc_ac97_match[] __devinitdata = {
 299         { .compatible = "fsl,mpc5200-psc-ac97", },
 300         { .compatible = "fsl,mpc5200b-psc-ac97", },
 301         {}
 302 };
 303 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 304
 305 static struct of_platform_driver psc_ac97_driver = {
 306         .probe = psc_ac97_of_probe,
 307         .remove = __devexit_p(psc_ac97_of_remove),
 308         .driver = {
 309                 .name = "mpc5200-psc-ac97",
 310                 .owner = THIS_MODULE,
 311                 .of_match_table = psc_ac97_match,
 312         },
 313 };
 314
 315 /* ---------------------------------------------------------------------
 316  * Module setup and teardown; simply register the of_platform driver
 317  * for the PSC in AC97 mode.
 318  */
 319 static int __init psc_ac97_init(void)
 320 {
 321         return of_register_platform_driver(&psc_ac97_driver);
 322 }
 323 module_init(psc_ac97_init);
 324
 325 static void __exit psc_ac97_exit(void)
 326 {
 327         of_unregister_platform_driver(&psc_ac97_driver);
 328 }
 329 module_exit(psc_ac97_exit);
 330
 331 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 332 MODULE_DESCRIPTION("mpc5200 AC97 module");
 333 MODULE_LICENSE("GPL");
 334