sound/soc/fsl/mpc5200_psc_ac97.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
   4 //
   5 // Copyright (C) 2009 Jon Smirl, Digispeaker
   6 // Author: Jon Smirl <jonsmirl@gmail.com>
   7
   8 #include <linux/module.h>
   9 #include <linux/of_device.h>
  10 #include <linux/of_platform.h>
  11 #include <linux/delay.h>
  12 #include <linux/time.h>
  13
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16 #include <sound/soc.h>
  17
  18 #include <asm/time.h>
  19 #include <asm/delay.h>
  20 #include <asm/mpc52xx.h>
  21 #include <asm/mpc52xx_psc.h>
  22
  23 #include "mpc5200_dma.h"
  24
  25 #define DRV_NAME "mpc5200-psc-ac97"
  26
  27 /* ALSA only supports a single AC97 device so static is recommend here */
  28 static struct psc_dma *psc_dma;
  29
  30 static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
  31 {
  32         int status;
  33         unsigned int val;
  34
  35         mutex_lock(&psc_dma->mutex);
  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                 mutex_unlock(&psc_dma->mutex);
  43                 return -ENODEV;
  44         }
  45
  46         /* Force clear the data valid bit */
  47         in_be32(&psc_dma->psc_regs->ac97_data);
  48
  49         /* Send the read */
  50         out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));
  51
  52         /* Wait for the answer */
  53         status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
  54                                 MPC52xx_PSC_SR_DATA_VAL), 100, 0);
  55         if (status == 0) {
  56                 pr_err("timeout on ac97 read (val) %x\n",
  57                                 in_be16(&psc_dma->psc_regs->sr_csr.status));
  58                 mutex_unlock(&psc_dma->mutex);
  59                 return -ENODEV;
  60         }
  61         /* Get the data */
  62         val = in_be32(&psc_dma->psc_regs->ac97_data);
  63         if (((val >> 24) & 0x7f) != reg) {
  64                 pr_err("reg echo error on ac97 read\n");
  65                 mutex_unlock(&psc_dma->mutex);
  66                 return -ENODEV;
  67         }
  68         val = (val >> 8) & 0xffff;
  69
  70         mutex_unlock(&psc_dma->mutex);
  71         return (unsigned short) val;
  72 }
  73
  74 static void psc_ac97_write(struct snd_ac97 *ac97,
  75                                 unsigned short reg, unsigned short val)
  76 {
  77         int status;
  78
  79         mutex_lock(&psc_dma->mutex);
  80
  81         /* Wait for command status zero = ready */
  82         status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
  83                                 MPC52xx_PSC_SR_CMDSEND), 100, 0);
  84         if (status == 0) {
  85                 pr_err("timeout on ac97 bus (write)\n");
  86                 goto out;
  87         }
  88         /* Write data */
  89         out_be32(&psc_dma->psc_regs->ac97_cmd,
  90                         ((reg & 0x7f) << 24) | (val << 8));
  91
  92  out:
  93         mutex_unlock(&psc_dma->mutex);
  94 }
  95
  96 static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
  97 {
  98         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
  99
 100         mutex_lock(&psc_dma->mutex);
 101
 102         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
 103         udelay(3);
 104         out_be32(&regs->sicr, psc_dma->sicr);
 105
 106         mutex_unlock(&psc_dma->mutex);
 107 }
 108
 109 static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
 110 {
 111         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 112
 113         mutex_lock(&psc_dma->mutex);
 114         dev_dbg(psc_dma->dev, "cold reset\n");
 115
 116         mpc5200_psc_ac97_gpio_reset(psc_dma->id);
 117
 118         /* Notify the PSC that a reset has occurred */
 119         out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);
 120
 121         /* Re-enable RX and TX */
 122         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 123
 124         mutex_unlock(&psc_dma->mutex);
 125
 126         usleep_range(1000, 2000);
 127         psc_ac97_warm_reset(ac97);
 128 }
 129
 130 static struct snd_ac97_bus_ops psc_ac97_ops = {
 131         .read           = psc_ac97_read,
 132         .write          = psc_ac97_write,
 133         .reset          = psc_ac97_cold_reset,
 134         .warm_reset     = psc_ac97_warm_reset,
 135 };
 136
 137 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
 138                                  struct snd_pcm_hw_params *params,
 139                                  struct snd_soc_dai *cpu_dai)
 140 {
 141         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 142         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 143
 144         dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
 145                 " periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
 146                 " rate=%i format=%i\n",
 147                 __func__, substream, params_period_size(params),
 148                 params_period_bytes(params), params_periods(params),
 149                 params_buffer_size(params), params_buffer_bytes(params),
 150                 params_channels(params), params_rate(params),
 151                 params_format(params));
 152
 153         /* Determine the set of enable bits to turn on */
 154         s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
 155         if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
 156                 s->ac97_slot_bits <<= 16;
 157         return 0;
 158 }
 159
 160 static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
 161                                  struct snd_pcm_hw_params *params,
 162                                  struct snd_soc_dai *cpu_dai)
 163 {
 164         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 165
 166         dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);
 167
 168         if (params_channels(params) == 1)
 169                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
 170         else
 171                 out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);
 172
 173         return 0;
 174 }
 175
 176 static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 177                                                         struct snd_soc_dai *dai)
 178 {
 179         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
 180         struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
 181
 182         switch (cmd) {
 183         case SNDRV_PCM_TRIGGER_START:
 184                 dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
 185                         substream->pstr->stream);
 186
 187                 /* Set 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         case SNDRV_PCM_TRIGGER_STOP:
 193                 dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
 194                         substream->pstr->stream);
 195
 196                 /* Clear the slot enable bits */
 197                 psc_dma->slots &= ~(s->ac97_slot_bits);
 198                 out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
 199                 break;
 200         }
 201         return 0;
 202 }
 203
 204 static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
 205 {
 206         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
 207         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 208
 209         /* Go */
 210         out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
 211         return 0;
 212 }
 213
 214 /* ---------------------------------------------------------------------
 215  * ALSA SoC Bindings
 216  *
 217  * - Digital Audio Interface (DAI) template
 218  * - create/destroy dai hooks
 219  */
 220
 221 /**
 222  * psc_ac97_dai_template: template CPU Digital Audio Interface
 223  */
 224 static const struct snd_soc_dai_ops psc_ac97_analog_ops = {
 225         .hw_params      = psc_ac97_hw_analog_params,
 226         .trigger        = psc_ac97_trigger,
 227 };
 228
 229 static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
 230         .hw_params      = psc_ac97_hw_digital_params,
 231 };
 232
 233 static struct snd_soc_dai_driver psc_ac97_dai[] = {
 234 {
 235         .name = "mpc5200-psc-ac97.0",
 236         .probe  = psc_ac97_probe,
 237         .playback = {
 238                 .stream_name    = "AC97 Playback",
 239                 .channels_min   = 1,
 240                 .channels_max   = 6,
 241                 .rates          = SNDRV_PCM_RATE_8000_48000,
 242                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 243         },
 244         .capture = {
 245                 .stream_name    = "AC97 Capture",
 246                 .channels_min   = 1,
 247                 .channels_max   = 2,
 248                 .rates          = SNDRV_PCM_RATE_8000_48000,
 249                 .formats = SNDRV_PCM_FMTBIT_S32_BE,
 250         },
 251         .ops = &psc_ac97_analog_ops,
 252 },
 253 {
 254         .name = "mpc5200-psc-ac97.1",
 255         .playback = {
 256                 .stream_name    = "AC97 SPDIF",
 257                 .channels_min   = 1,
 258                 .channels_max   = 2,
 259                 .rates          = SNDRV_PCM_RATE_32000 | \
 260                         SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
 261                 .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
 262         },
 263         .ops = &psc_ac97_digital_ops,
 264 } };
 265
 266 static const struct snd_soc_component_driver psc_ac97_component = {
 267         .name           = DRV_NAME,
 268 };
 269
 270
 271 /* ---------------------------------------------------------------------
 272  * OF platform bus binding code:
 273  * - Probe/remove operations
 274  * - OF device match table
 275  */
 276 static int psc_ac97_of_probe(struct platform_device *op)
 277 {
 278         int rc;
 279         struct mpc52xx_psc __iomem *regs;
 280
 281         rc = mpc5200_audio_dma_create(op);
 282         if (rc != 0)
 283                 return rc;
 284
 285         rc = snd_soc_set_ac97_ops(&psc_ac97_ops);
 286         if (rc != 0) {
 287                 dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", rc);
 288                 return rc;
 289         }
 290
 291         rc = snd_soc_register_component(&op->dev, &psc_ac97_component,
 292                                         psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
 293         if (rc != 0) {
 294                 dev_err(&op->dev, "Failed to register DAI\n");
 295                 return rc;
 296         }
 297
 298         psc_dma = dev_get_drvdata(&op->dev);
 299         regs = psc_dma->psc_regs;
 300
 301         psc_dma->imr = 0;
 302         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 303
 304         /* Configure the serial interface mode to AC97 */
 305         psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
 306         out_be32(&regs->sicr, psc_dma->sicr);
 307
 308         /* No slots active */
 309         out_be32(&regs->ac97_slots, 0x00000000);
 310
 311         return 0;
 312 }
 313
 314 static int psc_ac97_of_remove(struct platform_device *op)
 315 {
 316         mpc5200_audio_dma_destroy(op);
 317         snd_soc_unregister_component(&op->dev);
 318         snd_soc_set_ac97_ops(NULL);
 319         return 0;
 320 }
 321
 322 /* Match table for of_platform binding */
 323 static const struct of_device_id psc_ac97_match[] = {
 324         { .compatible = "fsl,mpc5200-psc-ac97", },
 325         { .compatible = "fsl,mpc5200b-psc-ac97", },
 326         {}
 327 };
 328 MODULE_DEVICE_TABLE(of, psc_ac97_match);
 329
 330 static struct platform_driver psc_ac97_driver = {
 331         .probe = psc_ac97_of_probe,
 332         .remove = psc_ac97_of_remove,
 333         .driver = {
 334                 .name = "mpc5200-psc-ac97",
 335                 .of_match_table = psc_ac97_match,
 336         },
 337 };
 338
 339 module_platform_driver(psc_ac97_driver);
 340
 341 MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
 342 MODULE_DESCRIPTION("mpc5200 AC97 module");
 343 MODULE_LICENSE("GPL");
 344