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 #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 */
  32 static struct psc_dma *psc_dma;
  33
  34 static 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
  78 static 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
 100 static 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
 113 static 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
 134 static 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
 141 static 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
 164 static 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
 180 static 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
 208 static 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  */
 228 static 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
 233 static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
 234         .hw_params      = psc_ac97_hw_digital_params,
 235 };
 236
 237 static 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
 272 static 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  */
 282 static 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
 320 static 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 */
 329 static const struct of_device_id psc_ac97_match[] = {
 330         { .compatible = "fsl,mpc5200-psc-ac97", },
 331         { .compatible = "fsl,mpc5200b-psc-ac97", },
 332         {}
 333 };
 334 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 335
 336 static 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
 345 module_platform_driver(psc_ac97_driver);
 346
 347 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 348 MODULE_DESCRIPTION("mpc5200 AC97 module");
 349 MODULE_LICENSE("GPL");
 350