sound/soc/dwc/designware_i2s.c

   1 /*
   2  * ALSA SoC Synopsys I2S Audio Layer
   3  *
   4  * sound/soc/spear/designware_i2s.c
   5  *
   6  * Copyright (C) 2010 ST Microelectronics
   7  * Rajeev Kumar <rajeev-dlh.kumar@st.com>
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2. This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/device.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21 #include <sound/designware_i2s.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25
  26 /* common register for all channel */
  27 #define IER             0x000
  28 #define IRER            0x004
  29 #define ITER            0x008
  30 #define CER             0x00C
  31 #define CCR             0x010
  32 #define RXFFR           0x014
  33 #define TXFFR           0x018
  34
  35 /* I2STxRxRegisters for all channels */
  36 #define LRBR_LTHR(x)    (0x40 * x + 0x020)
  37 #define RRBR_RTHR(x)    (0x40 * x + 0x024)
  38 #define RER(x)          (0x40 * x + 0x028)
  39 #define TER(x)          (0x40 * x + 0x02C)
  40 #define RCR(x)          (0x40 * x + 0x030)
  41 #define TCR(x)          (0x40 * x + 0x034)
  42 #define ISR(x)          (0x40 * x + 0x038)
  43 #define IMR(x)          (0x40 * x + 0x03C)
  44 #define ROR(x)          (0x40 * x + 0x040)
  45 #define TOR(x)          (0x40 * x + 0x044)
  46 #define RFCR(x)         (0x40 * x + 0x048)
  47 #define TFCR(x)         (0x40 * x + 0x04C)
  48 #define RFF(x)          (0x40 * x + 0x050)
  49 #define TFF(x)          (0x40 * x + 0x054)
  50
  51 /* I2SCOMPRegisters */
  52 #define I2S_COMP_PARAM_2        0x01F0
  53 #define I2S_COMP_PARAM_1        0x01F4
  54 #define I2S_COMP_VERSION        0x01F8
  55 #define I2S_COMP_TYPE           0x01FC
  56
  57 #define MAX_CHANNEL_NUM         8
  58 #define MIN_CHANNEL_NUM         2
  59
  60 struct dw_i2s_dev {
  61         void __iomem *i2s_base;
  62         struct clk *clk;
  63         int active;
  64         unsigned int capability;
  65         struct device *dev;
  66
  67         /* data related to DMA transfers b/w i2s and DMAC */
  68         struct i2s_dma_data play_dma_data;
  69         struct i2s_dma_data capture_dma_data;
  70         struct i2s_clk_config_data config;
  71         int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
  72 };
  73
  74 static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
  75 {
  76         writel(val, io_base + reg);
  77 }
  78
  79 static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
  80 {
  81         return readl(io_base + reg);
  82 }
  83
  84 static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
  85 {
  86         u32 i = 0;
  87
  88         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  89                 for (i = 0; i < 4; i++)
  90                         i2s_write_reg(dev->i2s_base, TER(i), 0);
  91         } else {
  92                 for (i = 0; i < 4; i++)
  93                         i2s_write_reg(dev->i2s_base, RER(i), 0);
  94         }
  95 }
  96
  97 static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
  98 {
  99         u32 i = 0;
 100
 101         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 102                 for (i = 0; i < 4; i++)
 103                         i2s_write_reg(dev->i2s_base, TOR(i), 0);
 104         } else {
 105                 for (i = 0; i < 4; i++)
 106                         i2s_write_reg(dev->i2s_base, ROR(i), 0);
 107         }
 108 }
 109
 110 static void i2s_start(struct dw_i2s_dev *dev,
 111                       struct snd_pcm_substream *substream)
 112 {
 113
 114         i2s_write_reg(dev->i2s_base, IER, 1);
 115
 116         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 117                 i2s_write_reg(dev->i2s_base, ITER, 1);
 118         else
 119                 i2s_write_reg(dev->i2s_base, IRER, 1);
 120
 121         i2s_write_reg(dev->i2s_base, CER, 1);
 122 }
 123
 124 static void i2s_stop(struct dw_i2s_dev *dev,
 125                 struct snd_pcm_substream *substream)
 126 {
 127         u32 i = 0, irq;
 128
 129         i2s_clear_irqs(dev, substream->stream);
 130         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 131                 i2s_write_reg(dev->i2s_base, ITER, 0);
 132
 133                 for (i = 0; i < 4; i++) {
 134                         irq = i2s_read_reg(dev->i2s_base, IMR(i));
 135                         i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
 136                 }
 137         } else {
 138                 i2s_write_reg(dev->i2s_base, IRER, 0);
 139
 140                 for (i = 0; i < 4; i++) {
 141                         irq = i2s_read_reg(dev->i2s_base, IMR(i));
 142                         i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
 143                 }
 144         }
 145
 146         if (!dev->active) {
 147                 i2s_write_reg(dev->i2s_base, CER, 0);
 148                 i2s_write_reg(dev->i2s_base, IER, 0);
 149         }
 150 }
 151
 152 static int dw_i2s_startup(struct snd_pcm_substream *substream,
 153                 struct snd_soc_dai *cpu_dai)
 154 {
 155         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
 156         struct i2s_dma_data *dma_data = NULL;
 157
 158         if (!(dev->capability & DWC_I2S_RECORD) &&
 159                         (substream->stream == SNDRV_PCM_STREAM_CAPTURE))
 160                 return -EINVAL;
 161
 162         if (!(dev->capability & DWC_I2S_PLAY) &&
 163                         (substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
 164                 return -EINVAL;
 165
 166         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 167                 dma_data = &dev->play_dma_data;
 168         else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 169                 dma_data = &dev->capture_dma_data;
 170
 171         snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);
 172
 173         return 0;
 174 }
 175
 176 static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 177                 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 178 {
 179         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 180         struct i2s_clk_config_data *config = &dev->config;
 181         u32 ccr, xfer_resolution, ch_reg, irq;
 182         int ret;
 183
 184         switch (params_format(params)) {
 185         case SNDRV_PCM_FORMAT_S16_LE:
 186                 config->data_width = 16;
 187                 ccr = 0x00;
 188                 xfer_resolution = 0x02;
 189                 break;
 190
 191         case SNDRV_PCM_FORMAT_S24_LE:
 192                 config->data_width = 24;
 193                 ccr = 0x08;
 194                 xfer_resolution = 0x04;
 195                 break;
 196
 197         case SNDRV_PCM_FORMAT_S32_LE:
 198                 config->data_width = 32;
 199                 ccr = 0x10;
 200                 xfer_resolution = 0x05;
 201                 break;
 202
 203         default:
 204                 dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
 205                 return -EINVAL;
 206         }
 207
 208         config->chan_nr = params_channels(params);
 209
 210         switch (config->chan_nr) {
 211         case EIGHT_CHANNEL_SUPPORT:
 212                 ch_reg = 3;
 213         case SIX_CHANNEL_SUPPORT:
 214                 ch_reg = 2;
 215         case FOUR_CHANNEL_SUPPORT:
 216                 ch_reg = 1;
 217         case TWO_CHANNEL_SUPPORT:
 218                 ch_reg = 0;
 219                 break;
 220         default:
 221                 dev_err(dev->dev, "channel not supported\n");
 222         }
 223
 224         i2s_disable_channels(dev, substream->stream);
 225
 226         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 227                 i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
 228                 i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
 229                 irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 230                 i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
 231                 i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
 232         } else {
 233                 i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
 234                 i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
 235                 irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 236                 i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
 237                 i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
 238         }
 239
 240         i2s_write_reg(dev->i2s_base, CCR, ccr);
 241
 242         config->sample_rate = params_rate(params);
 243
 244         if (!dev->i2s_clk_cfg)
 245                 return -EINVAL;
 246
 247         ret = dev->i2s_clk_cfg(config);
 248         if (ret < 0) {
 249                 dev_err(dev->dev, "runtime audio clk config fail\n");
 250                 return ret;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
 257                 struct snd_soc_dai *dai)
 258 {
 259         snd_soc_dai_set_dma_data(dai, substream, NULL);
 260 }
 261
 262 static int dw_i2s_trigger(struct snd_pcm_substream *substream,
 263                 int cmd, struct snd_soc_dai *dai)
 264 {
 265         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 266         int ret = 0;
 267
 268         switch (cmd) {
 269         case SNDRV_PCM_TRIGGER_START:
 270         case SNDRV_PCM_TRIGGER_RESUME:
 271         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 272                 dev->active++;
 273                 i2s_start(dev, substream);
 274                 break;
 275
 276         case SNDRV_PCM_TRIGGER_STOP:
 277         case SNDRV_PCM_TRIGGER_SUSPEND:
 278         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 279                 dev->active--;
 280                 i2s_stop(dev, substream);
 281                 break;
 282         default:
 283                 ret = -EINVAL;
 284                 break;
 285         }
 286         return ret;
 287 }
 288
 289 static struct snd_soc_dai_ops dw_i2s_dai_ops = {
 290         .startup        = dw_i2s_startup,
 291         .shutdown       = dw_i2s_shutdown,
 292         .hw_params      = dw_i2s_hw_params,
 293         .trigger        = dw_i2s_trigger,
 294 };
 295
 296 #ifdef CONFIG_PM
 297
 298 static int dw_i2s_suspend(struct snd_soc_dai *dai)
 299 {
 300         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 301
 302         clk_disable(dev->clk);
 303         return 0;
 304 }
 305
 306 static int dw_i2s_resume(struct snd_soc_dai *dai)
 307 {
 308         struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 309
 310         clk_enable(dev->clk);
 311         return 0;
 312 }
 313
 314 #else
 315 #define dw_i2s_suspend  NULL
 316 #define dw_i2s_resume   NULL
 317 #endif
 318
 319 static int dw_i2s_probe(struct platform_device *pdev)
 320 {
 321         const struct i2s_platform_data *pdata = pdev->dev.platform_data;
 322         struct dw_i2s_dev *dev;
 323         struct resource *res;
 324         int ret;
 325         unsigned int cap;
 326         struct snd_soc_dai_driver *dw_i2s_dai;
 327
 328         if (!pdata) {
 329                 dev_err(&pdev->dev, "Invalid platform data\n");
 330                 return -EINVAL;
 331         }
 332
 333         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 334         if (!res) {
 335                 dev_err(&pdev->dev, "no i2s resource defined\n");
 336                 return -ENODEV;
 337         }
 338
 339         if (!devm_request_mem_region(&pdev->dev, res->start,
 340                                 resource_size(res), pdev->name)) {
 341                 dev_err(&pdev->dev, "i2s region already claimed\n");
 342                 return -EBUSY;
 343         }
 344
 345         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 346         if (!dev) {
 347                 dev_warn(&pdev->dev, "kzalloc fail\n");
 348                 return -ENOMEM;
 349         }
 350
 351         dev->i2s_base = devm_ioremap(&pdev->dev, res->start,
 352                         resource_size(res));
 353         if (!dev->i2s_base) {
 354                 dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
 355                 return -ENOMEM;
 356         }
 357
 358         cap = pdata->cap;
 359         dev->capability = cap;
 360         dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
 361
 362         /* Set DMA slaves info */
 363
 364         dev->play_dma_data.data = pdata->play_dma_data;
 365         dev->capture_dma_data.data = pdata->capture_dma_data;
 366         dev->play_dma_data.addr = res->start + I2S_TXDMA;
 367         dev->capture_dma_data.addr = res->start + I2S_RXDMA;
 368         dev->play_dma_data.max_burst = 16;
 369         dev->capture_dma_data.max_burst = 16;
 370         dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 371         dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 372         dev->play_dma_data.filter = pdata->filter;
 373         dev->capture_dma_data.filter = pdata->filter;
 374
 375         dev->clk = clk_get(&pdev->dev, NULL);
 376         if (IS_ERR(dev->clk))
 377                 return  PTR_ERR(dev->clk);
 378
 379         ret = clk_enable(dev->clk);
 380         if (ret < 0)
 381                 goto err_clk_put;
 382
 383         dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
 384         if (!dw_i2s_dai) {
 385                 dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
 386                 ret = -ENOMEM;
 387                 goto err_clk_disable;
 388         }
 389
 390         if (cap & DWC_I2S_PLAY) {
 391                 dev_dbg(&pdev->dev, " SPEAr: play supported\n");
 392                 dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
 393                 dw_i2s_dai->playback.channels_max = pdata->channel;
 394                 dw_i2s_dai->playback.formats = pdata->snd_fmts;
 395                 dw_i2s_dai->playback.rates = pdata->snd_rates;
 396         }
 397
 398         if (cap & DWC_I2S_RECORD) {
 399                 dev_dbg(&pdev->dev, "SPEAr: record supported\n");
 400                 dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
 401                 dw_i2s_dai->capture.channels_max = pdata->channel;
 402                 dw_i2s_dai->capture.formats = pdata->snd_fmts;
 403                 dw_i2s_dai->capture.rates = pdata->snd_rates;
 404         }
 405
 406         dw_i2s_dai->ops = &dw_i2s_dai_ops;
 407         dw_i2s_dai->suspend = dw_i2s_suspend;
 408         dw_i2s_dai->resume = dw_i2s_resume;
 409
 410         dev->dev = &pdev->dev;
 411         dev_set_drvdata(&pdev->dev, dev);
 412         ret = snd_soc_register_dai(&pdev->dev, dw_i2s_dai);
 413         if (ret != 0) {
 414                 dev_err(&pdev->dev, "not able to register dai\n");
 415                 goto err_set_drvdata;
 416         }
 417
 418         return 0;
 419
 420 err_set_drvdata:
 421         dev_set_drvdata(&pdev->dev, NULL);
 422 err_clk_disable:
 423         clk_disable(dev->clk);
 424 err_clk_put:
 425         clk_put(dev->clk);
 426         return ret;
 427 }
 428
 429 static int dw_i2s_remove(struct platform_device *pdev)
 430 {
 431         struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
 432
 433         snd_soc_unregister_dai(&pdev->dev);
 434         dev_set_drvdata(&pdev->dev, NULL);
 435
 436         clk_put(dev->clk);
 437
 438         return 0;
 439 }
 440
 441 static struct platform_driver dw_i2s_driver = {
 442         .probe          = dw_i2s_probe,
 443         .remove         = dw_i2s_remove,
 444         .driver         = {
 445                 .name   = "designware-i2s",
 446                 .owner  = THIS_MODULE,
 447         },
 448 };
 449
 450 module_platform_driver(dw_i2s_driver);
 451
 452 MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
 453 MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
 454 MODULE_LICENSE("GPL");
 455 MODULE_ALIAS("platform:designware_i2s");