sound/soc/pxa/mmp-sspa.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * linux/sound/soc/pxa/mmp-sspa.c
   4  * Base on pxa2xx-ssp.c
   5  *
   6  * Copyright (C) 2011 Marvell International Ltd.
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/delay.h>
  12 #include <linux/clk.h>
  13 #include <linux/slab.h>
  14 #include <linux/pxa2xx_ssp.h>
  15 #include <linux/io.h>
  16 #include <linux/dmaengine.h>
  17
  18 #include <sound/core.h>
  19 #include <sound/pcm.h>
  20 #include <sound/initval.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23 #include <sound/pxa2xx-lib.h>
  24 #include <sound/dmaengine_pcm.h>
  25 #include "mmp-sspa.h"
  26
  27 /*
  28  * SSPA audio private data
  29  */
  30 struct sspa_priv {
  31         struct ssp_device *sspa;
  32         struct snd_dmaengine_dai_dma_data *dma_params;
  33         struct clk *audio_clk;
  34         struct clk *sysclk;
  35         int dai_fmt;
  36         int running_cnt;
  37 };
  38
  39 static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
  40 {
  41         __raw_writel(val, sspa->mmio_base + reg);
  42 }
  43
  44 static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
  45 {
  46         return __raw_readl(sspa->mmio_base + reg);
  47 }
  48
  49 static void mmp_sspa_tx_enable(struct ssp_device *sspa)
  50 {
  51         unsigned int sspa_sp;
  52
  53         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
  54         sspa_sp |= SSPA_SP_S_EN;
  55         sspa_sp |= SSPA_SP_WEN;
  56         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
  57 }
  58
  59 static void mmp_sspa_tx_disable(struct ssp_device *sspa)
  60 {
  61         unsigned int sspa_sp;
  62
  63         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
  64         sspa_sp &= ~SSPA_SP_S_EN;
  65         sspa_sp |= SSPA_SP_WEN;
  66         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
  67 }
  68
  69 static void mmp_sspa_rx_enable(struct ssp_device *sspa)
  70 {
  71         unsigned int sspa_sp;
  72
  73         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
  74         sspa_sp |= SSPA_SP_S_EN;
  75         sspa_sp |= SSPA_SP_WEN;
  76         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
  77 }
  78
  79 static void mmp_sspa_rx_disable(struct ssp_device *sspa)
  80 {
  81         unsigned int sspa_sp;
  82
  83         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
  84         sspa_sp &= ~SSPA_SP_S_EN;
  85         sspa_sp |= SSPA_SP_WEN;
  86         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
  87 }
  88
  89 static int mmp_sspa_startup(struct snd_pcm_substream *substream,
  90         struct snd_soc_dai *dai)
  91 {
  92         struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
  93
  94         clk_enable(priv->sysclk);
  95         clk_enable(priv->sspa->clk);
  96
  97         return 0;
  98 }
  99
 100 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
 101         struct snd_soc_dai *dai)
 102 {
 103         struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
 104
 105         clk_disable(priv->sspa->clk);
 106         clk_disable(priv->sysclk);
 107
 108 }
 109
 110 /*
 111  * Set the SSP ports SYSCLK.
 112  */
 113 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 114                                     int clk_id, unsigned int freq, int dir)
 115 {
 116         struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
 117         int ret = 0;
 118
 119         switch (clk_id) {
 120         case MMP_SSPA_CLK_AUDIO:
 121                 ret = clk_set_rate(priv->audio_clk, freq);
 122                 if (ret)
 123                         return ret;
 124                 break;
 125         case MMP_SSPA_CLK_PLL:
 126         case MMP_SSPA_CLK_VCXO:
 127                 /* not support yet */
 128                 return -EINVAL;
 129         default:
 130                 return -EINVAL;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
 137                                  int source, unsigned int freq_in,
 138                                  unsigned int freq_out)
 139 {
 140         struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
 141         int ret = 0;
 142
 143         switch (pll_id) {
 144         case MMP_SYSCLK:
 145                 ret = clk_set_rate(priv->sysclk, freq_out);
 146                 if (ret)
 147                         return ret;
 148                 break;
 149         case MMP_SSPA_CLK:
 150                 ret = clk_set_rate(priv->sspa->clk, freq_out);
 151                 if (ret)
 152                         return ret;
 153                 break;
 154         default:
 155                 return -ENODEV;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * Set up the sspa dai format. The sspa port must be inactive
 163  * before calling this function as the physical
 164  * interface format is changed.
 165  */
 166 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 167                                  unsigned int fmt)
 168 {
 169         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai);
 170         struct ssp_device *sspa = sspa_priv->sspa;
 171         u32 sspa_sp, sspa_ctrl;
 172
 173         /* check if we need to change anything at all */
 174         if (sspa_priv->dai_fmt == fmt)
 175                 return 0;
 176
 177         /* we can only change the settings if the port is not in use */
 178         if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) ||
 179             (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) {
 180                 dev_err(sspa->dev,
 181                         "can't change hardware dai format: stream is in use\n");
 182                 return -EINVAL;
 183         }
 184
 185         /* reset port settings */
 186         sspa_sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
 187         sspa_ctrl = 0;
 188
 189         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 190         case SND_SOC_DAIFMT_CBS_CFS:
 191                 sspa_sp |= SSPA_SP_MSL;
 192                 break;
 193         case SND_SOC_DAIFMT_CBM_CFM:
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198
 199         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 200         case SND_SOC_DAIFMT_NB_NF:
 201                 sspa_sp |= SSPA_SP_FSP;
 202                 break;
 203         default:
 204                 return -EINVAL;
 205         }
 206
 207         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 208         case SND_SOC_DAIFMT_I2S:
 209                 sspa_sp |= SSPA_TXSP_FPER(63);
 210                 sspa_sp |= SSPA_SP_FWID(31);
 211                 sspa_ctrl |= SSPA_CTL_XDATDLY(1);
 212                 break;
 213         default:
 214                 return -EINVAL;
 215         }
 216
 217         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 218         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
 219
 220         sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
 221         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 222         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
 223
 224         /*
 225          * FIXME: hw issue, for the tx serial port,
 226          * can not config the master/slave mode;
 227          * so must clean this bit.
 228          * The master/slave mode has been set in the
 229          * rx port.
 230          */
 231         sspa_sp &= ~SSPA_SP_MSL;
 232         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 233
 234         mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
 235         mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
 236
 237         /* Since we are configuring the timings for the format by hand
 238          * we have to defer some things until hw_params() where we
 239          * know parameters like the sample size.
 240          */
 241         sspa_priv->dai_fmt = fmt;
 242         return 0;
 243 }
 244
 245 /*
 246  * Set the SSPA audio DMA parameters and sample size.
 247  * Can be called multiple times by oss emulation.
 248  */
 249 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
 250                                struct snd_pcm_hw_params *params,
 251                                struct snd_soc_dai *dai)
 252 {
 253         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 254         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 255         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
 256         struct ssp_device *sspa = sspa_priv->sspa;
 257         struct snd_dmaengine_dai_dma_data *dma_params;
 258         u32 sspa_ctrl;
 259
 260         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 261                 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL);
 262         else
 263                 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL);
 264
 265         sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK;
 266         sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1);
 267         sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
 268         sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS);
 269         sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
 270
 271         switch (params_format(params)) {
 272         case SNDRV_PCM_FORMAT_S8:
 273                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS);
 274                 break;
 275         case SNDRV_PCM_FORMAT_S16_LE:
 276                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
 277                 break;
 278         case SNDRV_PCM_FORMAT_S20_3LE:
 279                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
 280                 break;
 281         case SNDRV_PCM_FORMAT_S24_3LE:
 282                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
 283                 break;
 284         case SNDRV_PCM_FORMAT_S32_LE:
 285                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS);
 286                 break;
 287         default:
 288                 return -EINVAL;
 289         }
 290
 291         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 292                 mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
 293                 mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1);
 294         } else {
 295                 mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
 296                 mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0);
 297         }
 298
 299         dma_params = &sspa_priv->dma_params[substream->stream];
 300         dma_params->addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 301                                 (sspa->phys_base + SSPA_TXD) :
 302                                 (sspa->phys_base + SSPA_RXD);
 303         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params);
 304         return 0;
 305 }
 306
 307 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
 308                              struct snd_soc_dai *dai)
 309 {
 310         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
 311         struct ssp_device *sspa = sspa_priv->sspa;
 312         int ret = 0;
 313
 314         switch (cmd) {
 315         case SNDRV_PCM_TRIGGER_START:
 316         case SNDRV_PCM_TRIGGER_RESUME:
 317         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 318                 /*
 319                  * whatever playback or capture, must enable rx.
 320                  * this is a hw issue, so need check if rx has been
 321                  * enabled or not; if has been enabled by another
 322                  * stream, do not enable again.
 323                  */
 324                 if (!sspa_priv->running_cnt)
 325                         mmp_sspa_rx_enable(sspa);
 326
 327                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 328                         mmp_sspa_tx_enable(sspa);
 329
 330                 sspa_priv->running_cnt++;
 331                 break;
 332
 333         case SNDRV_PCM_TRIGGER_STOP:
 334         case SNDRV_PCM_TRIGGER_SUSPEND:
 335         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 336                 sspa_priv->running_cnt--;
 337
 338                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 339                         mmp_sspa_tx_disable(sspa);
 340
 341                 /* have no capture stream, disable rx port */
 342                 if (!sspa_priv->running_cnt)
 343                         mmp_sspa_rx_disable(sspa);
 344                 break;
 345
 346         default:
 347                 ret = -EINVAL;
 348         }
 349
 350         return ret;
 351 }
 352
 353 static int mmp_sspa_probe(struct snd_soc_dai *dai)
 354 {
 355         struct sspa_priv *priv = dev_get_drvdata(dai->dev);
 356
 357         snd_soc_dai_set_drvdata(dai, priv);
 358         return 0;
 359
 360 }
 361
 362 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
 363 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
 364                 SNDRV_PCM_FMTBIT_S16_LE | \
 365                 SNDRV_PCM_FMTBIT_S24_LE | \
 366                 SNDRV_PCM_FMTBIT_S32_LE)
 367
 368 static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
 369         .startup        = mmp_sspa_startup,
 370         .shutdown       = mmp_sspa_shutdown,
 371         .trigger        = mmp_sspa_trigger,
 372         .hw_params      = mmp_sspa_hw_params,
 373         .set_sysclk     = mmp_sspa_set_dai_sysclk,
 374         .set_pll        = mmp_sspa_set_dai_pll,
 375         .set_fmt        = mmp_sspa_set_dai_fmt,
 376 };
 377
 378 static struct snd_soc_dai_driver mmp_sspa_dai = {
 379         .probe = mmp_sspa_probe,
 380         .playback = {
 381                 .channels_min = 1,
 382                 .channels_max = 128,
 383                 .rates = MMP_SSPA_RATES,
 384                 .formats = MMP_SSPA_FORMATS,
 385         },
 386         .capture = {
 387                 .channels_min = 1,
 388                 .channels_max = 2,
 389                 .rates = MMP_SSPA_RATES,
 390                 .formats = MMP_SSPA_FORMATS,
 391         },
 392         .ops = &mmp_sspa_dai_ops,
 393 };
 394
 395 static const struct snd_soc_component_driver mmp_sspa_component = {
 396         .name           = "mmp-sspa",
 397 };
 398
 399 static int asoc_mmp_sspa_probe(struct platform_device *pdev)
 400 {
 401         struct sspa_priv *priv;
 402
 403         priv = devm_kzalloc(&pdev->dev,
 404                                 sizeof(struct sspa_priv), GFP_KERNEL);
 405         if (!priv)
 406                 return -ENOMEM;
 407
 408         priv->sspa = devm_kzalloc(&pdev->dev,
 409                                 sizeof(struct ssp_device), GFP_KERNEL);
 410         if (priv->sspa == NULL)
 411                 return -ENOMEM;
 412
 413         priv->dma_params = devm_kcalloc(&pdev->dev,
 414                         2, sizeof(struct snd_dmaengine_dai_dma_data),
 415                         GFP_KERNEL);
 416         if (priv->dma_params == NULL)
 417                 return -ENOMEM;
 418
 419         priv->sspa->mmio_base = devm_platform_ioremap_resource(pdev, 0);
 420         if (IS_ERR(priv->sspa->mmio_base))
 421                 return PTR_ERR(priv->sspa->mmio_base);
 422
 423         priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
 424         if (IS_ERR(priv->sspa->clk))
 425                 return PTR_ERR(priv->sspa->clk);
 426
 427         priv->audio_clk = clk_get(NULL, "mmp-audio");
 428         if (IS_ERR(priv->audio_clk))
 429                 return PTR_ERR(priv->audio_clk);
 430
 431         priv->sysclk = clk_get(NULL, "mmp-sysclk");
 432         if (IS_ERR(priv->sysclk)) {
 433                 clk_put(priv->audio_clk);
 434                 return PTR_ERR(priv->sysclk);
 435         }
 436         clk_enable(priv->audio_clk);
 437         priv->dai_fmt = (unsigned int) -1;
 438         platform_set_drvdata(pdev, priv);
 439
 440         return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
 441                                                &mmp_sspa_dai, 1);
 442 }
 443
 444 static int asoc_mmp_sspa_remove(struct platform_device *pdev)
 445 {
 446         struct sspa_priv *priv = platform_get_drvdata(pdev);
 447
 448         clk_disable(priv->audio_clk);
 449         clk_put(priv->audio_clk);
 450         clk_put(priv->sysclk);
 451         return 0;
 452 }
 453
 454 static struct platform_driver asoc_mmp_sspa_driver = {
 455         .driver = {
 456                 .name = "mmp-sspa-dai",
 457         },
 458         .probe = asoc_mmp_sspa_probe,
 459         .remove = asoc_mmp_sspa_remove,
 460 };
 461
 462 module_platform_driver(asoc_mmp_sspa_driver);
 463
 464 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 465 MODULE_DESCRIPTION("MMP SSPA SoC Interface");
 466 MODULE_LICENSE("GPL");
 467 MODULE_ALIAS("platform:mmp-sspa-dai");