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