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 #include "mpc5200_psc_ac97.h"
  29
  30 #define DRV_NAME "mpc5200-psc-ac97"
  31
  32 /* ALSA only supports a single AC97 device so static is recommend here */
  33 static struct psc_dma *psc_dma;
  34
  35 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  36 {
  37         int status;
  38         unsigned int val;
  39
  40         mutex_lock(&psc_dma->mutex);
  41
  42         /* Wait for command send status zero = ready */
  43         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  44                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  45         if (status == 0) {
  46                 pr_err("timeout on ac97 bus (rdy)\n");
  47                 mutex_unlock(&psc_dma->mutex);
  48                 return -ENODEV;
  49         }
  50
  51         /* Force clear the data valid bit */
  52         in_be32(&psc_dma->psc_regs->ac97_data);
  53
  54         /* Send the read */
  55         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
  56
  57         /* Wait for the answer */
  58         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
  59                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
  60         if (status == 0) {
  61                 pr_err("timeout on ac97 read (val) %x\n",
  62                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
  63                 mutex_unlock(&psc_dma->mutex);
  64                 return -ENODEV;
  65         }
  66         /* Get the data */
  67         val = in_be32(&psc_dma->psc_regs->ac97_data);
  68         if (((val >> 24) & 0x7f) != reg) {
  69                 pr_err("reg echo error on ac97 read\n");
  70                 mutex_unlock(&psc_dma->mutex);
  71                 return -ENODEV;
  72         }
  73         val = (val >> 8) & 0xffff;
  74
  75         mutex_unlock(&psc_dma->mutex);
  76         return (unsigned short) val;
  77 }
  78
  79 static void psc_ac97_write(struct snd_ac97 *ac97,
  80                                 unsigned short reg, unsigned short val)
  81 {
  82         int status;
  83
  84         mutex_lock(&psc_dma->mutex);
  85
  86         /* Wait for command status zero = ready */
  87         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  88                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  89         if (status == 0) {
  90                 pr_err("timeout on ac97 bus (write)\n");
  91                 goto out;
  92         }
  93         /* Write data */
  94         out_be32(&psc_dma->psc_regs->ac97_cmd,
  95                         ((reg & 0x7f) << 24) | (val << 8));
  96
  97  out:
  98         mutex_unlock(&psc_dma->mutex);
  99 }
 100
 101 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
 102 {
 103         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 104
 105         mutex_lock(&psc_dma->mutex);
 106
 107         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 108         udelay(3);
 109         out_be32(&regs->sicr, psc_dma->sicr);
 110
 111         mutex_unlock(&psc_dma->mutex);
 112 }
 113
 114 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 115 {
 116         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 117
 118         mutex_lock(&psc_dma->mutex);
 119         dev_dbg(psc_dma->dev, "cold reset\n");
 120
 121         mpc5200_psc_ac97_gpio_reset(psc_dma->id);
 122
 123         /* Notify the PSC that a reset has occurred */
 124         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
 125
 126         /* Re-enable RX and TX */
 127         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 128
 129         mutex_unlock(&psc_dma->mutex);
 130
 131         usleep_range(1000, 2000);
 132         psc_ac97_warm_reset(ac97);
 133 }
 134
 135 static struct snd_ac97_bus_ops psc_ac97_ops = {
 136         .read           = psc_ac97_read,
 137         .write          = psc_ac97_write,
 138         .reset          = psc_ac97_cold_reset,
 139         .warm_reset     = psc_ac97_warm_reset,
 140 };
 141
 142 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 143                                  struct snd_pcm_hw_params *params,
 144                                  struct snd_soc_dai *cpu_dai)
 145 {
 146         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 147         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 148
 149         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 150                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 151                 " rate=%i format=%i\n",
 152                 __func__, substream, params_period_size(params),
 153                 params_period_bytes(params), params_periods(params),
 154                 params_buffer_size(params), params_buffer_bytes(params),
 155                 params_channels(params), params_rate(params),
 156                 params_format(params));
 157
 158         /* Determine the set of enable bits to turn on */
 159         s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
 160         if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
 161                 s->ac97_slot_bits <<= 16;
 162         return 0;
 163 }
 164
 165 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 166                                  struct snd_pcm_hw_params *params,
 167                                  struct snd_soc_dai *cpu_dai)
 168 {
 169         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 170
 171         dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
 172
 173         if (params_channels(params) == 1)
 174                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 175         else
 176                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
 177
 178         return 0;
 179 }
 180
 181 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 182                                                         struct snd_soc_dai *dai)
 183 {
 184         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
 185         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 186
 187         switch (cmd) {
 188         case SNDRV_PCM_TRIGGER_START:
 189                 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 190                         substream->pstr->stream);
 191
 192                 /* Set the slot enable bits */
 193                 psc_dma->slots |= s->ac97_slot_bits;
 194                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 195                 break;
 196
 197         case SNDRV_PCM_TRIGGER_STOP:
 198                 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 199                         substream->pstr->stream);
 200
 201                 /* Clear the slot enable bits */
 202                 psc_dma->slots &= ~(s->ac97_slot_bits);
 203                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 204                 break;
 205         }
 206         return 0;
 207 }
 208
 209 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
 210 {
 211         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 212         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 213
 214         /* Go */
 215         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 216         return 0;
 217 }
 218
 219 /* ---------------------------------------------------------------------
 220  * ALSA SoC Bindings
 221  *
 222  * - Digital Audio Interface (DAI) template
 223  * - create/destroy dai hooks
 224  */
 225
 226 /**
 227  * psc_ac97_dai_template: template CPU Digital Audio Interface
 228  */
 229 static const struct snd_soc_dai_ops psc_ac97_analog_ops = {
 230         .hw_params      = psc_ac97_hw_analog_params,
 231         .trigger        = psc_ac97_trigger,
 232 };
 233
 234 static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
 235         .hw_params      = psc_ac97_hw_digital_params,
 236 };
 237
 238 static struct snd_soc_dai_driver psc_ac97_dai[] = {
 239 {
 240         .name = "mpc5200-psc-ac97.0",
 241         .bus_control = true,
 242         .probe  = psc_ac97_probe,
 243         .playback = {
 244                 .stream_name    = "AC97 Playback",
 245                 .channels_min   = 1,
 246                 .channels_max   = 6,
 247                 .rates          = SNDRV_PCM_RATE_8000_48000,
 248                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 249         },
 250         .capture = {
 251                 .stream_name    = "AC97 Capture",
 252                 .channels_min   = 1,
 253                 .channels_max   = 2,
 254                 .rates          = SNDRV_PCM_RATE_8000_48000,
 255                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 256         },
 257         .ops = &psc_ac97_analog_ops,
 258 },
 259 {
 260         .name = "mpc5200-psc-ac97.1",
 261         .bus_control = true,
 262         .playback = {
 263                 .stream_name    = "AC97 SPDIF",
 264                 .channels_min   = 1,
 265                 .channels_max   = 2,
 266                 .rates          = SNDRV_PCM_RATE_32000 | \
 267                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 268                 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 269         },
 270         .ops = &psc_ac97_digital_ops,
 271 } };
 272
 273 static const struct snd_soc_component_driver psc_ac97_component = {
 274         .name           = DRV_NAME,
 275 };
 276
 277
 278 /* ---------------------------------------------------------------------
 279  * OF platform bus binding code:
 280  * - Probe/remove operations
 281  * - OF device match table
 282  */
 283 static int psc_ac97_of_probe(struct platform_device *op)
 284 {
 285         int rc;
 286         struct mpc52xx_psc __iomem *regs;
 287
 288         rc = mpc5200_audio_dma_create(op);
 289         if (rc != 0)
 290                 return rc;
 291
 292         rc = snd_soc_set_ac97_ops(&psc_ac97_ops);
 293         if (rc != 0) {
 294                 dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc);
 295                 return rc;
 296         }
 297
 298         rc = snd_soc_register_component(&op->dev, &psc_ac97_component,
 299                                         psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 300         if (rc != 0) {
 301                 dev_err(&op->dev, "Failed to register DAI\n");
 302                 return rc;
 303         }
 304
 305         psc_dma = dev_get_drvdata(&op->dev);
 306         regs = psc_dma->psc_regs;
 307
 308         psc_dma->imr = 0;
 309         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 310
 311         /* Configure the serial interface mode to AC97 */
 312         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 313         out_be32(&regs->sicr, psc_dma->sicr);
 314
 315         /* No slots active */
 316         out_be32(&regs->ac97_slots, 0x00000000);
 317
 318         return 0;
 319 }
 320
 321 static int psc_ac97_of_remove(struct platform_device *op)
 322 {
 323         mpc5200_audio_dma_destroy(op);
 324         snd_soc_unregister_component(&op->dev);
 325         snd_soc_set_ac97_ops(NULL);
 326         return 0;
 327 }
 328
 329 /* Match table for of_platform binding */
 330 static const struct of_device_id psc_ac97_match[] = {
 331         { .compatible = "fsl,mpc5200-psc-ac97", },
 332         { .compatible = "fsl,mpc5200b-psc-ac97", },
 333         {}
 334 };
 335 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 336
 337 static struct platform_driver psc_ac97_driver = {
 338         .probe = psc_ac97_of_probe,
 339         .remove = psc_ac97_of_remove,
 340         .driver = {
 341                 .name = "mpc5200-psc-ac97",
 342                 .of_match_table = psc_ac97_match,
 343         },
 344 };
 345
 346 module_platform_driver(psc_ac97_driver);
 347
 348 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 349 MODULE_DESCRIPTION("mpc5200 AC97 module");
 350 MODULE_LICENSE("GPL");
 351