sound/soc/codecs/rt5514-spi.c

   1 /*
   2  * rt5514-spi.c  --  RT5514 SPI driver
   3  *
   4  * Copyright 2015 Realtek Semiconductor Corp.
   5  * Author: Oder Chiou <oder_chiou@realtek.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/input.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/device.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irq.h>
  20 #include <linux/slab.h>
  21 #include <linux/gpio.h>
  22 #include <linux/sched.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/pm_qos.h>
  26 #include <linux/sysfs.h>
  27 #include <linux/clk.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32 #include <sound/soc-dapm.h>
  33 #include <sound/initval.h>
  34 #include <sound/tlv.h>
  35
  36 #include "rt5514-spi.h"
  37
  38 static struct spi_device *rt5514_spi;
  39
  40 struct rt5514_dsp {
  41         struct device *dev;
  42         struct delayed_work copy_work;
  43         struct mutex dma_lock;
  44         struct snd_pcm_substream *substream;
  45         unsigned int buf_base, buf_limit, buf_rp;
  46         size_t buf_size;
  47         size_t dma_offset;
  48         size_t dsp_offset;
  49 };
  50
  51 static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
  52         .info                   = SNDRV_PCM_INFO_MMAP |
  53                                   SNDRV_PCM_INFO_MMAP_VALID |
  54                                   SNDRV_PCM_INFO_INTERLEAVED,
  55         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  56         .period_bytes_min       = PAGE_SIZE,
  57         .period_bytes_max       = 0x20000 / 8,
  58         .periods_min            = 8,
  59         .periods_max            = 8,
  60         .channels_min           = 1,
  61         .channels_max           = 1,
  62         .buffer_bytes_max       = 0x20000,
  63 };
  64
  65 static struct snd_soc_dai_driver rt5514_spi_dai = {
  66         .name = "rt5514-dsp-cpu-dai",
  67         .id = 0,
  68         .capture = {
  69                 .stream_name = "DSP Capture",
  70                 .channels_min = 1,
  71                 .channels_max = 1,
  72                 .rates = SNDRV_PCM_RATE_16000,
  73                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  74         },
  75 };
  76
  77 static void rt5514_spi_copy_work(struct work_struct *work)
  78 {
  79         struct rt5514_dsp *rt5514_dsp =
  80                 container_of(work, struct rt5514_dsp, copy_work.work);
  81         struct snd_pcm_runtime *runtime;
  82         size_t period_bytes, truncated_bytes = 0;
  83
  84         mutex_lock(&rt5514_dsp->dma_lock);
  85         if (!rt5514_dsp->substream) {
  86                 dev_err(rt5514_dsp->dev, "No pcm substream\n");
  87                 goto done;
  88         }
  89
  90         runtime = rt5514_dsp->substream->runtime;
  91         period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
  92
  93         if (rt5514_dsp->buf_size - rt5514_dsp->dsp_offset <  period_bytes)
  94                 period_bytes = rt5514_dsp->buf_size - rt5514_dsp->dsp_offset;
  95
  96         if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
  97                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
  98                         runtime->dma_area + rt5514_dsp->dma_offset,
  99                         period_bytes);
 100
 101                 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
 102                         rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
 103                 else
 104                         rt5514_dsp->buf_rp += period_bytes;
 105         } else {
 106                 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
 107                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
 108                         runtime->dma_area + rt5514_dsp->dma_offset,
 109                         truncated_bytes);
 110
 111                 rt5514_spi_burst_read(rt5514_dsp->buf_base,
 112                         runtime->dma_area + rt5514_dsp->dma_offset +
 113                         truncated_bytes, period_bytes - truncated_bytes);
 114
 115                         rt5514_dsp->buf_rp = rt5514_dsp->buf_base +
 116                                 period_bytes - truncated_bytes;
 117         }
 118
 119         rt5514_dsp->dma_offset += period_bytes;
 120         if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
 121                 rt5514_dsp->dma_offset = 0;
 122
 123         rt5514_dsp->dsp_offset += period_bytes;
 124
 125         snd_pcm_period_elapsed(rt5514_dsp->substream);
 126
 127         if (rt5514_dsp->dsp_offset < rt5514_dsp->buf_size)
 128                 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
 129 done:
 130         mutex_unlock(&rt5514_dsp->dma_lock);
 131 }
 132
 133 /* PCM for streaming audio from the DSP buffer */
 134 static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
 135 {
 136         snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
 137
 138         return 0;
 139 }
 140
 141 static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
 142                                struct snd_pcm_hw_params *hw_params)
 143 {
 144         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 145         struct rt5514_dsp *rt5514_dsp =
 146                         snd_soc_platform_get_drvdata(rtd->platform);
 147         int ret;
 148
 149         mutex_lock(&rt5514_dsp->dma_lock);
 150         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 151                         params_buffer_bytes(hw_params));
 152         rt5514_dsp->substream = substream;
 153         mutex_unlock(&rt5514_dsp->dma_lock);
 154
 155         return ret;
 156 }
 157
 158 static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
 159 {
 160         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 161         struct rt5514_dsp *rt5514_dsp =
 162                         snd_soc_platform_get_drvdata(rtd->platform);
 163
 164         mutex_lock(&rt5514_dsp->dma_lock);
 165         rt5514_dsp->substream = NULL;
 166         mutex_unlock(&rt5514_dsp->dma_lock);
 167
 168         cancel_delayed_work_sync(&rt5514_dsp->copy_work);
 169
 170         return snd_pcm_lib_free_vmalloc_buffer(substream);
 171 }
 172
 173 static int rt5514_spi_prepare(struct snd_pcm_substream *substream)
 174 {
 175         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 176         struct rt5514_dsp *rt5514_dsp =
 177                         snd_soc_platform_get_drvdata(rtd->platform);
 178         u8 buf[8];
 179
 180         rt5514_dsp->dma_offset = 0;
 181         rt5514_dsp->dsp_offset = 0;
 182
 183         /**
 184          * The address area x1800XXXX is the register address, and it cannot
 185          * support spi burst read perfectly. So we use the spi burst read
 186          * individually to make sure the data correctly.
 187         */
 188         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
 189                 sizeof(buf));
 190         rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
 191                                 buf[3] << 24;
 192
 193         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
 194                 sizeof(buf));
 195         rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
 196                                 buf[3] << 24;
 197
 198         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_RP, (u8 *)&buf,
 199                 sizeof(buf));
 200         rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
 201                                 buf[3] << 24;
 202
 203         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_SIZE, (u8 *)&buf,
 204                 sizeof(buf));
 205         rt5514_dsp->buf_size = buf[0] | buf[1] << 8 | buf[2] << 16 |
 206                                 buf[3] << 24;
 207
 208         return 0;
 209 }
 210
 211 static int rt5514_spi_trigger(struct snd_pcm_substream *substream, int cmd)
 212 {
 213         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 214         struct rt5514_dsp *rt5514_dsp =
 215                         snd_soc_platform_get_drvdata(rtd->platform);
 216
 217         if (cmd == SNDRV_PCM_TRIGGER_START) {
 218                 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
 219                         rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
 220                         schedule_delayed_work(&rt5514_dsp->copy_work, 0);
 221         }
 222
 223         return 0;
 224 }
 225
 226 static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
 227                 struct snd_pcm_substream *substream)
 228 {
 229         struct snd_pcm_runtime *runtime = substream->runtime;
 230         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 231         struct rt5514_dsp *rt5514_dsp =
 232                 snd_soc_platform_get_drvdata(rtd->platform);
 233
 234         return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
 235 }
 236
 237 static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
 238         .open           = rt5514_spi_pcm_open,
 239         .hw_params      = rt5514_spi_hw_params,
 240         .hw_free        = rt5514_spi_hw_free,
 241         .trigger        = rt5514_spi_trigger,
 242         .prepare        = rt5514_spi_prepare,
 243         .pointer        = rt5514_spi_pcm_pointer,
 244         .mmap           = snd_pcm_lib_mmap_vmalloc,
 245         .page           = snd_pcm_lib_get_vmalloc_page,
 246 };
 247
 248 static int rt5514_spi_pcm_probe(struct snd_soc_platform *platform)
 249 {
 250         struct rt5514_dsp *rt5514_dsp;
 251
 252         rt5514_dsp = devm_kzalloc(platform->dev, sizeof(*rt5514_dsp),
 253                         GFP_KERNEL);
 254
 255         rt5514_dsp->dev = &rt5514_spi->dev;
 256         mutex_init(&rt5514_dsp->dma_lock);
 257         INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
 258         snd_soc_platform_set_drvdata(platform, rt5514_dsp);
 259
 260         return 0;
 261 }
 262
 263 static struct snd_soc_platform_driver rt5514_spi_platform = {
 264         .probe = rt5514_spi_pcm_probe,
 265         .ops = &rt5514_spi_pcm_ops,
 266 };
 267
 268 static const struct snd_soc_component_driver rt5514_spi_dai_component = {
 269         .name           = "rt5514-spi-dai",
 270 };
 271
 272 /**
 273  * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
 274  * @addr: Start address.
 275  * @rxbuf: Data Buffer for reading.
 276  * @len: Data length, it must be a multiple of 8.
 277  *
 278  *
 279  * Returns true for success.
 280  */
 281 int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
 282 {
 283         u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
 284         int status;
 285         u8 write_buf[8];
 286         unsigned int i, end, offset = 0;
 287
 288         struct spi_message message;
 289         struct spi_transfer x[3];
 290
 291         while (offset < len) {
 292                 if (offset + RT5514_SPI_BUF_LEN <= len)
 293                         end = RT5514_SPI_BUF_LEN;
 294                 else
 295                         end = len % RT5514_SPI_BUF_LEN;
 296
 297                 write_buf[0] = spi_cmd;
 298                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
 299                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
 300                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
 301                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
 302
 303                 spi_message_init(&message);
 304                 memset(x, 0, sizeof(x));
 305
 306                 x[0].len = 5;
 307                 x[0].tx_buf = write_buf;
 308                 spi_message_add_tail(&x[0], &message);
 309
 310                 x[1].len = 4;
 311                 x[1].tx_buf = write_buf;
 312                 spi_message_add_tail(&x[1], &message);
 313
 314                 x[2].len = end;
 315                 x[2].rx_buf = rxbuf + offset;
 316                 spi_message_add_tail(&x[2], &message);
 317
 318                 status = spi_sync(rt5514_spi, &message);
 319
 320                 if (status)
 321                         return false;
 322
 323                 offset += RT5514_SPI_BUF_LEN;
 324         }
 325
 326         for (i = 0; i < len; i += 8) {
 327                 write_buf[0] = rxbuf[i + 0];
 328                 write_buf[1] = rxbuf[i + 1];
 329                 write_buf[2] = rxbuf[i + 2];
 330                 write_buf[3] = rxbuf[i + 3];
 331                 write_buf[4] = rxbuf[i + 4];
 332                 write_buf[5] = rxbuf[i + 5];
 333                 write_buf[6] = rxbuf[i + 6];
 334                 write_buf[7] = rxbuf[i + 7];
 335
 336                 rxbuf[i + 0] = write_buf[7];
 337                 rxbuf[i + 1] = write_buf[6];
 338                 rxbuf[i + 2] = write_buf[5];
 339                 rxbuf[i + 3] = write_buf[4];
 340                 rxbuf[i + 4] = write_buf[3];
 341                 rxbuf[i + 5] = write_buf[2];
 342                 rxbuf[i + 6] = write_buf[1];
 343                 rxbuf[i + 7] = write_buf[0];
 344         }
 345
 346         return true;
 347 }
 348
 349 /**
 350  * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
 351  * @addr: Start address.
 352  * @txbuf: Data Buffer for writng.
 353  * @len: Data length, it must be a multiple of 8.
 354  *
 355  *
 356  * Returns true for success.
 357  */
 358 int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
 359 {
 360         u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
 361         u8 *write_buf;
 362         unsigned int i, end, offset = 0;
 363
 364         write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
 365
 366         if (write_buf == NULL)
 367                 return -ENOMEM;
 368
 369         while (offset < len) {
 370                 if (offset + RT5514_SPI_BUF_LEN <= len)
 371                         end = RT5514_SPI_BUF_LEN;
 372                 else
 373                         end = len % RT5514_SPI_BUF_LEN;
 374
 375                 write_buf[0] = spi_cmd;
 376                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
 377                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
 378                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
 379                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
 380
 381                 for (i = 0; i < end; i += 8) {
 382                         write_buf[i + 12] = txbuf[offset + i + 0];
 383                         write_buf[i + 11] = txbuf[offset + i + 1];
 384                         write_buf[i + 10] = txbuf[offset + i + 2];
 385                         write_buf[i +  9] = txbuf[offset + i + 3];
 386                         write_buf[i +  8] = txbuf[offset + i + 4];
 387                         write_buf[i +  7] = txbuf[offset + i + 5];
 388                         write_buf[i +  6] = txbuf[offset + i + 6];
 389                         write_buf[i +  5] = txbuf[offset + i + 7];
 390                 }
 391
 392                 write_buf[end + 5] = spi_cmd;
 393
 394                 spi_write(rt5514_spi, write_buf, end + 6);
 395
 396                 offset += RT5514_SPI_BUF_LEN;
 397         }
 398
 399         kfree(write_buf);
 400
 401         return 0;
 402 }
 403 EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
 404
 405 static int rt5514_spi_probe(struct spi_device *spi)
 406 {
 407         int ret;
 408
 409         rt5514_spi = spi;
 410
 411         ret = devm_snd_soc_register_platform(&spi->dev, &rt5514_spi_platform);
 412         if (ret < 0) {
 413                 dev_err(&spi->dev, "Failed to register platform.\n");
 414                 return ret;
 415         }
 416
 417         ret = devm_snd_soc_register_component(&spi->dev,
 418                                               &rt5514_spi_dai_component,
 419                                               &rt5514_spi_dai, 1);
 420         if (ret < 0) {
 421                 dev_err(&spi->dev, "Failed to register component.\n");
 422                 return ret;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static const struct of_device_id rt5514_of_match[] = {
 429         { .compatible = "realtek,rt5514", },
 430         {},
 431 };
 432 MODULE_DEVICE_TABLE(of, rt5514_of_match);
 433
 434 static struct spi_driver rt5514_spi_driver = {
 435         .driver = {
 436                 .name = "rt5514",
 437                 .of_match_table = of_match_ptr(rt5514_of_match),
 438         },
 439         .probe = rt5514_spi_probe,
 440 };
 441 module_spi_driver(rt5514_spi_driver);
 442
 443 MODULE_DESCRIPTION("RT5514 SPI driver");
 444 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
 445 MODULE_LICENSE("GPL v2");