sound/soc/pxa/mmp-sspa.c

   1 /*
   2  * linux/sound/soc/pxa/mmp-sspa.c
   3  * Base on pxa2xx-ssp.c
   4  *
   5  * Copyright (C) 2011 Marvell International Ltd.
   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 as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/delay.h>
  26 #include <linux/clk.h>
  27 #include <linux/slab.h>
  28 #include <linux/pxa2xx_ssp.h>
  29 #include <linux/io.h>
  30 #include <linux/dmaengine.h>
  31
  32 #include <sound/core.h>
  33 #include <sound/pcm.h>
  34 #include <sound/initval.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37 #include <sound/pxa2xx-lib.h>
  38 #include <sound/dmaengine_pcm.h>
  39 #include "mmp-sspa.h"
  40
  41 /*
  42  * SSPA audio private data
  43  */
  44 struct sspa_priv {
  45         struct ssp_device *sspa;
  46         struct snd_dmaengine_dai_dma_data *dma_params;
  47         struct clk *audio_clk;
  48         struct clk *sysclk;
  49         int dai_fmt;
  50         int running_cnt;
  51 };
  52
  53 static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
  54 {
  55         __raw_writel(val, sspa->mmio_base + reg);
  56 }
  57
  58 static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
  59 {
  60         return __raw_readl(sspa->mmio_base + reg);
  61 }
  62
  63 static void mmp_sspa_tx_enable(struct ssp_device *sspa)
  64 {
  65         unsigned int sspa_sp;
  66
  67         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
  68         sspa_sp |= SSPA_SP_S_EN;
  69         sspa_sp |= SSPA_SP_WEN;
  70         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
  71 }
  72
  73 static void mmp_sspa_tx_disable(struct ssp_device *sspa)
  74 {
  75         unsigned int sspa_sp;
  76
  77         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
  78         sspa_sp &= ~SSPA_SP_S_EN;
  79         sspa_sp |= SSPA_SP_WEN;
  80         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
  81 }
  82
  83 static void mmp_sspa_rx_enable(struct ssp_device *sspa)
  84 {
  85         unsigned int sspa_sp;
  86
  87         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
  88         sspa_sp |= SSPA_SP_S_EN;
  89         sspa_sp |= SSPA_SP_WEN;
  90         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
  91 }
  92
  93 static void mmp_sspa_rx_disable(struct ssp_device *sspa)
  94 {
  95         unsigned int sspa_sp;
  96
  97         sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
  98         sspa_sp &= ~SSPA_SP_S_EN;
  99         sspa_sp |= SSPA_SP_WEN;
 100         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
 101 }
 102
 103 static int mmp_sspa_startup(struct snd_pcm_substream *substream,
 104         struct snd_soc_dai *dai)
 105 {
 106         struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
 107
 108         clk_enable(priv->sysclk);
 109         clk_enable(priv->sspa->clk);
 110
 111         return 0;
 112 }
 113
 114 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
 115         struct snd_soc_dai *dai)
 116 {
 117         struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
 118
 119         clk_disable(priv->sspa->clk);
 120         clk_disable(priv->sysclk);
 121
 122 }
 123
 124 /*
 125  * Set the SSP ports SYSCLK.
 126  */
 127 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 128                                     int clk_id, unsigned int freq, int dir)
 129 {
 130         struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
 131         int ret = 0;
 132
 133         switch (clk_id) {
 134         case MMP_SSPA_CLK_AUDIO:
 135                 ret = clk_set_rate(priv->audio_clk, freq);
 136                 if (ret)
 137                         return ret;
 138                 break;
 139         case MMP_SSPA_CLK_PLL:
 140         case MMP_SSPA_CLK_VCXO:
 141                 /* not support yet */
 142                 return -EINVAL;
 143         default:
 144                 return -EINVAL;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
 151                                  int source, unsigned int freq_in,
 152                                  unsigned int freq_out)
 153 {
 154         struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
 155         int ret = 0;
 156
 157         switch (pll_id) {
 158         case MMP_SYSCLK:
 159                 ret = clk_set_rate(priv->sysclk, freq_out);
 160                 if (ret)
 161                         return ret;
 162                 break;
 163         case MMP_SSPA_CLK:
 164                 ret = clk_set_rate(priv->sspa->clk, freq_out);
 165                 if (ret)
 166                         return ret;
 167                 break;
 168         default:
 169                 return -ENODEV;
 170         }
 171
 172         return 0;
 173 }
 174
 175 /*
 176  * Set up the sspa dai format. The sspa port must be inactive
 177  * before calling this function as the physical
 178  * interface format is changed.
 179  */
 180 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 181                                  unsigned int fmt)
 182 {
 183         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai);
 184         struct ssp_device *sspa = sspa_priv->sspa;
 185         u32 sspa_sp, sspa_ctrl;
 186
 187         /* check if we need to change anything at all */
 188         if (sspa_priv->dai_fmt == fmt)
 189                 return 0;
 190
 191         /* we can only change the settings if the port is not in use */
 192         if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) ||
 193             (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) {
 194                 dev_err(&sspa->pdev->dev,
 195                         "can't change hardware dai format: stream is in use\n");
 196                 return -EINVAL;
 197         }
 198
 199         /* reset port settings */
 200         sspa_sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
 201         sspa_ctrl = 0;
 202
 203         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 204         case SND_SOC_DAIFMT_CBS_CFS:
 205                 sspa_sp |= SSPA_SP_MSL;
 206                 break;
 207         case SND_SOC_DAIFMT_CBM_CFM:
 208                 break;
 209         default:
 210                 return -EINVAL;
 211         }
 212
 213         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 214         case SND_SOC_DAIFMT_NB_NF:
 215                 sspa_sp |= SSPA_SP_FSP;
 216                 break;
 217         default:
 218                 return -EINVAL;
 219         }
 220
 221         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 222         case SND_SOC_DAIFMT_I2S:
 223                 sspa_sp |= SSPA_TXSP_FPER(63);
 224                 sspa_sp |= SSPA_SP_FWID(31);
 225                 sspa_ctrl |= SSPA_CTL_XDATDLY(1);
 226                 break;
 227         default:
 228                 return -EINVAL;
 229         }
 230
 231         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 232         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
 233
 234         sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
 235         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 236         mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
 237
 238         /*
 239          * FIXME: hw issue, for the tx serial port,
 240          * can not config the master/slave mode;
 241          * so must clean this bit.
 242          * The master/slave mode has been set in the
 243          * rx port.
 244          */
 245         sspa_sp &= ~SSPA_SP_MSL;
 246         mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
 247
 248         mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
 249         mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
 250
 251         /* Since we are configuring the timings for the format by hand
 252          * we have to defer some things until hw_params() where we
 253          * know parameters like the sample size.
 254          */
 255         sspa_priv->dai_fmt = fmt;
 256         return 0;
 257 }
 258
 259 /*
 260  * Set the SSPA audio DMA parameters and sample size.
 261  * Can be called multiple times by oss emulation.
 262  */
 263 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
 264                                struct snd_pcm_hw_params *params,
 265                                struct snd_soc_dai *dai)
 266 {
 267         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 268         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 269         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
 270         struct ssp_device *sspa = sspa_priv->sspa;
 271         struct snd_dmaengine_dai_dma_data *dma_params;
 272         u32 sspa_ctrl;
 273
 274         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 275                 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL);
 276         else
 277                 sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL);
 278
 279         sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK;
 280         sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1);
 281         sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
 282         sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS);
 283         sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
 284
 285         switch (params_format(params)) {
 286         case SNDRV_PCM_FORMAT_S8:
 287                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS);
 288                 break;
 289         case SNDRV_PCM_FORMAT_S16_LE:
 290                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
 291                 break;
 292         case SNDRV_PCM_FORMAT_S20_3LE:
 293                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
 294                 break;
 295         case SNDRV_PCM_FORMAT_S24_3LE:
 296                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
 297                 break;
 298         case SNDRV_PCM_FORMAT_S32_LE:
 299                 sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS);
 300                 break;
 301         default:
 302                 return -EINVAL;
 303         }
 304
 305         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 306                 mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
 307                 mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1);
 308         } else {
 309                 mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
 310                 mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0);
 311         }
 312
 313         dma_params = &sspa_priv->dma_params[substream->stream];
 314         dma_params->addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
 315                                 (sspa->phys_base + SSPA_TXD) :
 316                                 (sspa->phys_base + SSPA_RXD);
 317         snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params);
 318         return 0;
 319 }
 320
 321 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
 322                              struct snd_soc_dai *dai)
 323 {
 324         struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
 325         struct ssp_device *sspa = sspa_priv->sspa;
 326         int ret = 0;
 327
 328         switch (cmd) {
 329         case SNDRV_PCM_TRIGGER_START:
 330         case SNDRV_PCM_TRIGGER_RESUME:
 331         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 332                 /*
 333                  * whatever playback or capture, must enable rx.
 334                  * this is a hw issue, so need check if rx has been
 335                  * enabled or not; if has been enabled by another
 336                  * stream, do not enable again.
 337                  */
 338                 if (!sspa_priv->running_cnt)
 339                         mmp_sspa_rx_enable(sspa);
 340
 341                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 342                         mmp_sspa_tx_enable(sspa);
 343
 344                 sspa_priv->running_cnt++;
 345                 break;
 346
 347         case SNDRV_PCM_TRIGGER_STOP:
 348         case SNDRV_PCM_TRIGGER_SUSPEND:
 349         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 350                 sspa_priv->running_cnt--;
 351
 352                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 353                         mmp_sspa_tx_disable(sspa);
 354
 355                 /* have no capture stream, disable rx port */
 356                 if (!sspa_priv->running_cnt)
 357                         mmp_sspa_rx_disable(sspa);
 358                 break;
 359
 360         default:
 361                 ret = -EINVAL;
 362         }
 363
 364         return ret;
 365 }
 366
 367 static int mmp_sspa_probe(struct snd_soc_dai *dai)
 368 {
 369         struct sspa_priv *priv = dev_get_drvdata(dai->dev);
 370
 371         snd_soc_dai_set_drvdata(dai, priv);
 372         return 0;
 373
 374 }
 375
 376 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
 377 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
 378                 SNDRV_PCM_FMTBIT_S16_LE | \
 379                 SNDRV_PCM_FMTBIT_S24_LE | \
 380                 SNDRV_PCM_FMTBIT_S24_LE | \
 381                 SNDRV_PCM_FMTBIT_S32_LE)
 382
 383 static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
 384         .startup        = mmp_sspa_startup,
 385         .shutdown       = mmp_sspa_shutdown,
 386         .trigger        = mmp_sspa_trigger,
 387         .hw_params      = mmp_sspa_hw_params,
 388         .set_sysclk     = mmp_sspa_set_dai_sysclk,
 389         .set_pll        = mmp_sspa_set_dai_pll,
 390         .set_fmt        = mmp_sspa_set_dai_fmt,
 391 };
 392
 393 static struct snd_soc_dai_driver mmp_sspa_dai = {
 394         .probe = mmp_sspa_probe,
 395         .playback = {
 396                 .channels_min = 1,
 397                 .channels_max = 128,
 398                 .rates = MMP_SSPA_RATES,
 399                 .formats = MMP_SSPA_FORMATS,
 400         },
 401         .capture = {
 402                 .channels_min = 1,
 403                 .channels_max = 2,
 404                 .rates = MMP_SSPA_RATES,
 405                 .formats = MMP_SSPA_FORMATS,
 406         },
 407         .ops = &mmp_sspa_dai_ops,
 408 };
 409
 410 static const struct snd_soc_component_driver mmp_sspa_component = {
 411         .name           = "mmp-sspa",
 412 };
 413
 414 static int asoc_mmp_sspa_probe(struct platform_device *pdev)
 415 {
 416         struct sspa_priv *priv;
 417         struct resource *res;
 418
 419         priv = devm_kzalloc(&pdev->dev,
 420                                 sizeof(struct sspa_priv), GFP_KERNEL);
 421         if (!priv)
 422                 return -ENOMEM;
 423
 424         priv->sspa = devm_kzalloc(&pdev->dev,
 425                                 sizeof(struct ssp_device), GFP_KERNEL);
 426         if (priv->sspa == NULL)
 427                 return -ENOMEM;
 428
 429         priv->dma_params = devm_kzalloc(&pdev->dev,
 430                         2 * sizeof(struct snd_dmaengine_dai_dma_data),
 431                         GFP_KERNEL);
 432         if (priv->dma_params == NULL)
 433                 return -ENOMEM;
 434
 435         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 436         priv->sspa->mmio_base = devm_ioremap_resource(&pdev->dev, res);
 437         if (IS_ERR(priv->sspa->mmio_base))
 438                 return PTR_ERR(priv->sspa->mmio_base);
 439
 440         priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
 441         if (IS_ERR(priv->sspa->clk))
 442                 return PTR_ERR(priv->sspa->clk);
 443
 444         priv->audio_clk = clk_get(NULL, "mmp-audio");
 445         if (IS_ERR(priv->audio_clk))
 446                 return PTR_ERR(priv->audio_clk);
 447
 448         priv->sysclk = clk_get(NULL, "mmp-sysclk");
 449         if (IS_ERR(priv->sysclk)) {
 450                 clk_put(priv->audio_clk);
 451                 return PTR_ERR(priv->sysclk);
 452         }
 453         clk_enable(priv->audio_clk);
 454         priv->dai_fmt = (unsigned int) -1;
 455         platform_set_drvdata(pdev, priv);
 456
 457         return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
 458                                                &mmp_sspa_dai, 1);
 459 }
 460
 461 static int asoc_mmp_sspa_remove(struct platform_device *pdev)
 462 {
 463         struct sspa_priv *priv = platform_get_drvdata(pdev);
 464
 465         clk_disable(priv->audio_clk);
 466         clk_put(priv->audio_clk);
 467         clk_put(priv->sysclk);
 468         return 0;
 469 }
 470
 471 static struct platform_driver asoc_mmp_sspa_driver = {
 472         .driver = {
 473                 .name = "mmp-sspa-dai",
 474         },
 475         .probe = asoc_mmp_sspa_probe,
 476         .remove = asoc_mmp_sspa_remove,
 477 };
 478
 479 module_platform_driver(asoc_mmp_sspa_driver);
 480
 481 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 482 MODULE_DESCRIPTION("MMP SSPA SoC Interface");
 483 MODULE_LICENSE("GPL");
 484 MODULE_ALIAS("platform:mmp-sspa-dai");