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