LXR linux/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 */
  30struct 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
  39static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
  40{
  41        __raw_writel(val, sspa->mmio_base + reg);
  42}
  43
  44static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
  45{
  46        return __raw_readl(sspa->mmio_base + reg);
  47}
  48
  49static 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
  59static 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
  69static 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
  79static 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
  89static 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
 100static 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 */
 113static 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
 136static 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 */
 166static 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->pdev->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 */
 249static 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
 307static 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
 353static 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
 368static 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
 378static 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
 395static const struct snd_soc_component_driver mmp_sspa_component = {
 396        .name           = "mmp-sspa",
 397};
 398
 399static int asoc_mmp_sspa_probe(struct platform_device *pdev)
 400{
 401        struct sspa_priv *priv;
 402        struct resource *res;
 403
 404        priv = devm_kzalloc(&pdev->dev,
 405                                sizeof(struct sspa_priv), GFP_KERNEL);
 406        if (!priv)
 407                return -ENOMEM;
 408
 409        priv->sspa = devm_kzalloc(&pdev->dev,
 410                                sizeof(struct ssp_device), GFP_KERNEL);
 411        if (priv->sspa == NULL)
 412                return -ENOMEM;
 413
 414        priv->dma_params = devm_kcalloc(&pdev->dev,
 415                        2, sizeof(struct snd_dmaengine_dai_dma_data),
 416                        GFP_KERNEL);
 417        if (priv->dma_params == NULL)
 418                return -ENOMEM;
 419
 420        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 421        priv->sspa->mmio_base = devm_ioremap_resource(&pdev->dev, res);
 422        if (IS_ERR(priv->sspa->mmio_base))
 423                return PTR_ERR(priv->sspa->mmio_base);
 424
 425        priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
 426        if (IS_ERR(priv->sspa->clk))
 427                return PTR_ERR(priv->sspa->clk);
 428
 429        priv->audio_clk = clk_get(NULL, "mmp-audio");
 430        if (IS_ERR(priv->audio_clk))
 431                return PTR_ERR(priv->audio_clk);
 432
 433        priv->sysclk = clk_get(NULL, "mmp-sysclk");
 434        if (IS_ERR(priv->sysclk)) {
 435                clk_put(priv->audio_clk);
 436                return PTR_ERR(priv->sysclk);
 437        }
 438        clk_enable(priv->audio_clk);
 439        priv->dai_fmt = (unsigned int) -1;
 440        platform_set_drvdata(pdev, priv);
 441
 442        return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
 443                                               &mmp_sspa_dai, 1);
 444}
 445
 446static int asoc_mmp_sspa_remove(struct platform_device *pdev)
 447{
 448        struct sspa_priv *priv = platform_get_drvdata(pdev);
 449
 450        clk_disable(priv->audio_clk);
 451        clk_put(priv->audio_clk);
 452        clk_put(priv->sysclk);
 453        return 0;
 454}
 455
 456static struct platform_driver asoc_mmp_sspa_driver = {
 457        .driver = {
 458                .name = "mmp-sspa-dai",
 459        },
 460        .probe = asoc_mmp_sspa_probe,
 461        .remove = asoc_mmp_sspa_remove,
 462};
 463
 464module_platform_driver(asoc_mmp_sspa_driver);
 465
 466MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
 467MODULE_DESCRIPTION("MMP SSPA SoC Interface");
 468MODULE_LICENSE("GPL");
 469MODULE_ALIAS("platform:mmp-sspa-dai");
 470