sound/soc/tegra/tegra20_ac97.c

   1 /*
   2  * tegra20_ac97.c - Tegra20 AC97 platform driver
   3  *
   4  * Copyright (c) 2012 Lucas Stach <dev@lynxeye.de>
   5  *
   6  * Partly based on code copyright/by:
   7  *
   8  * Copyright (c) 2011,2012 Toradex Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/clk.h>
  22 #include <linux/delay.h>
  23 #include <linux/device.h>
  24 #include <linux/gpio.h>
  25 #include <linux/io.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/module.h>
  28 #include <linux/of.h>
  29 #include <linux/of_gpio.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/regmap.h>
  33 #include <linux/slab.h>
  34 #include <sound/core.h>
  35 #include <sound/pcm.h>
  36 #include <sound/pcm_params.h>
  37 #include <sound/soc.h>
  38 #include <sound/dmaengine_pcm.h>
  39
  40 #include "tegra_asoc_utils.h"
  41 #include "tegra20_ac97.h"
  42
  43 #define DRV_NAME "tegra20-ac97"
  44
  45 static struct tegra20_ac97 *workdata;
  46
  47 static void tegra20_ac97_codec_reset(struct snd_ac97 *ac97)
  48 {
  49         u32 readback;
  50         unsigned long timeout;
  51
  52         /* reset line is not driven by DAC pad group, have to toggle GPIO */
  53         gpio_set_value(workdata->reset_gpio, 0);
  54         udelay(2);
  55
  56         gpio_set_value(workdata->reset_gpio, 1);
  57         udelay(2);
  58
  59         timeout = jiffies + msecs_to_jiffies(100);
  60
  61         do {
  62                 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
  63                 if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY)
  64                         break;
  65                 usleep_range(1000, 2000);
  66         } while (!time_after(jiffies, timeout));
  67 }
  68
  69 static void tegra20_ac97_codec_warm_reset(struct snd_ac97 *ac97)
  70 {
  71         u32 readback;
  72         unsigned long timeout;
  73
  74         /*
  75          * although sync line is driven by the DAC pad group warm reset using
  76          * the controller cmd is not working, have to toggle sync line
  77          * manually.
  78          */
  79         gpio_request(workdata->sync_gpio, "codec-sync");
  80
  81         gpio_direction_output(workdata->sync_gpio, 1);
  82
  83         udelay(2);
  84         gpio_set_value(workdata->sync_gpio, 0);
  85         udelay(2);
  86         gpio_free(workdata->sync_gpio);
  87
  88         timeout = jiffies + msecs_to_jiffies(100);
  89
  90         do {
  91                 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
  92                 if (readback & TEGRA20_AC97_STATUS1_CODEC1_RDY)
  93                         break;
  94                 usleep_range(1000, 2000);
  95         } while (!time_after(jiffies, timeout));
  96 }
  97
  98 static unsigned short tegra20_ac97_codec_read(struct snd_ac97 *ac97_snd,
  99                                               unsigned short reg)
 100 {
 101         u32 readback;
 102         unsigned long timeout;
 103
 104         regmap_write(workdata->regmap, TEGRA20_AC97_CMD,
 105                      (((reg | 0x80) << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) &
 106                       TEGRA20_AC97_CMD_CMD_ADDR_MASK) |
 107                      TEGRA20_AC97_CMD_BUSY);
 108
 109         timeout = jiffies + msecs_to_jiffies(100);
 110
 111         do {
 112                 regmap_read(workdata->regmap, TEGRA20_AC97_STATUS1, &readback);
 113                 if (readback & TEGRA20_AC97_STATUS1_STA_VALID1)
 114                         break;
 115                 usleep_range(1000, 2000);
 116         } while (!time_after(jiffies, timeout));
 117
 118         return ((readback & TEGRA20_AC97_STATUS1_STA_DATA1_MASK) >>
 119                 TEGRA20_AC97_STATUS1_STA_DATA1_SHIFT);
 120 }
 121
 122 static void tegra20_ac97_codec_write(struct snd_ac97 *ac97_snd,
 123                                      unsigned short reg, unsigned short val)
 124 {
 125         u32 readback;
 126         unsigned long timeout;
 127
 128         regmap_write(workdata->regmap, TEGRA20_AC97_CMD,
 129                      ((reg << TEGRA20_AC97_CMD_CMD_ADDR_SHIFT) &
 130                       TEGRA20_AC97_CMD_CMD_ADDR_MASK) |
 131                      ((val << TEGRA20_AC97_CMD_CMD_DATA_SHIFT) &
 132                       TEGRA20_AC97_CMD_CMD_DATA_MASK) |
 133                      TEGRA20_AC97_CMD_BUSY);
 134
 135         timeout = jiffies + msecs_to_jiffies(100);
 136
 137         do {
 138                 regmap_read(workdata->regmap, TEGRA20_AC97_CMD, &readback);
 139                 if (!(readback & TEGRA20_AC97_CMD_BUSY))
 140                         break;
 141                 usleep_range(1000, 2000);
 142         } while (!time_after(jiffies, timeout));
 143 }
 144
 145 static struct snd_ac97_bus_ops tegra20_ac97_ops = {
 146         .read           = tegra20_ac97_codec_read,
 147         .write          = tegra20_ac97_codec_write,
 148         .reset          = tegra20_ac97_codec_reset,
 149         .warm_reset     = tegra20_ac97_codec_warm_reset,
 150 };
 151
 152 static inline void tegra20_ac97_start_playback(struct tegra20_ac97 *ac97)
 153 {
 154         regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
 155                            TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN,
 156                            TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN);
 157
 158         regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL,
 159                            TEGRA20_AC97_CTRL_PCM_DAC_EN |
 160                            TEGRA20_AC97_CTRL_STM_EN,
 161                            TEGRA20_AC97_CTRL_PCM_DAC_EN |
 162                            TEGRA20_AC97_CTRL_STM_EN);
 163 }
 164
 165 static inline void tegra20_ac97_stop_playback(struct tegra20_ac97 *ac97)
 166 {
 167         regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
 168                            TEGRA20_AC97_FIFO_SCR_PB_QRT_MT_EN, 0);
 169
 170         regmap_update_bits(ac97->regmap, TEGRA20_AC97_CTRL,
 171                            TEGRA20_AC97_CTRL_PCM_DAC_EN, 0);
 172 }
 173
 174 static inline void tegra20_ac97_start_capture(struct tegra20_ac97 *ac97)
 175 {
 176         regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
 177                            TEGRA20_AC97_FIFO_SCR_REC_FULL_EN,
 178                            TEGRA20_AC97_FIFO_SCR_REC_FULL_EN);
 179 }
 180
 181 static inline void tegra20_ac97_stop_capture(struct tegra20_ac97 *ac97)
 182 {
 183         regmap_update_bits(ac97->regmap, TEGRA20_AC97_FIFO1_SCR,
 184                            TEGRA20_AC97_FIFO_SCR_REC_FULL_EN, 0);
 185 }
 186
 187 static int tegra20_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 188                                 struct snd_soc_dai *dai)
 189 {
 190         struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai);
 191
 192         switch (cmd) {
 193         case SNDRV_PCM_TRIGGER_START:
 194         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 195         case SNDRV_PCM_TRIGGER_RESUME:
 196                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 197                         tegra20_ac97_start_playback(ac97);
 198                 else
 199                         tegra20_ac97_start_capture(ac97);
 200                 break;
 201         case SNDRV_PCM_TRIGGER_STOP:
 202         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 203         case SNDRV_PCM_TRIGGER_SUSPEND:
 204                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 205                         tegra20_ac97_stop_playback(ac97);
 206                 else
 207                         tegra20_ac97_stop_capture(ac97);
 208                 break;
 209         default:
 210                 return -EINVAL;
 211         }
 212
 213         return 0;
 214 }
 215
 216 static const struct snd_soc_dai_ops tegra20_ac97_dai_ops = {
 217         .trigger        = tegra20_ac97_trigger,
 218 };
 219
 220 static int tegra20_ac97_probe(struct snd_soc_dai *dai)
 221 {
 222         struct tegra20_ac97 *ac97 = snd_soc_dai_get_drvdata(dai);
 223
 224         dai->capture_dma_data = &ac97->capture_dma_data;
 225         dai->playback_dma_data = &ac97->playback_dma_data;
 226
 227         return 0;
 228 }
 229
 230 static struct snd_soc_dai_driver tegra20_ac97_dai = {
 231         .name = "tegra-ac97-pcm",
 232         .ac97_control = 1,
 233         .probe = tegra20_ac97_probe,
 234         .playback = {
 235                 .stream_name = "PCM Playback",
 236                 .channels_min = 2,
 237                 .channels_max = 2,
 238                 .rates = SNDRV_PCM_RATE_8000_48000,
 239                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 240         },
 241         .capture = {
 242                 .stream_name = "PCM Capture",
 243                 .channels_min = 2,
 244                 .channels_max = 2,
 245                 .rates = SNDRV_PCM_RATE_8000_48000,
 246                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 247         },
 248         .ops = &tegra20_ac97_dai_ops,
 249 };
 250
 251 static const struct snd_soc_component_driver tegra20_ac97_component = {
 252         .name           = DRV_NAME,
 253 };
 254
 255 static bool tegra20_ac97_wr_rd_reg(struct device *dev, unsigned int reg)
 256 {
 257         switch (reg) {
 258         case TEGRA20_AC97_CTRL:
 259         case TEGRA20_AC97_CMD:
 260         case TEGRA20_AC97_STATUS1:
 261         case TEGRA20_AC97_FIFO1_SCR:
 262         case TEGRA20_AC97_FIFO_TX1:
 263         case TEGRA20_AC97_FIFO_RX1:
 264                 return true;
 265         default:
 266                 break;
 267         }
 268
 269         return false;
 270 }
 271
 272 static bool tegra20_ac97_volatile_reg(struct device *dev, unsigned int reg)
 273 {
 274         switch (reg) {
 275         case TEGRA20_AC97_STATUS1:
 276         case TEGRA20_AC97_FIFO1_SCR:
 277         case TEGRA20_AC97_FIFO_TX1:
 278         case TEGRA20_AC97_FIFO_RX1:
 279                 return true;
 280         default:
 281                 break;
 282         }
 283
 284         return false;
 285 }
 286
 287 static bool tegra20_ac97_precious_reg(struct device *dev, unsigned int reg)
 288 {
 289         switch (reg) {
 290         case TEGRA20_AC97_FIFO_TX1:
 291         case TEGRA20_AC97_FIFO_RX1:
 292                 return true;
 293         default:
 294                 break;
 295         }
 296
 297         return false;
 298 }
 299
 300 static const struct regmap_config tegra20_ac97_regmap_config = {
 301         .reg_bits = 32,
 302         .reg_stride = 4,
 303         .val_bits = 32,
 304         .max_register = TEGRA20_AC97_FIFO_RX1,
 305         .writeable_reg = tegra20_ac97_wr_rd_reg,
 306         .readable_reg = tegra20_ac97_wr_rd_reg,
 307         .volatile_reg = tegra20_ac97_volatile_reg,
 308         .precious_reg = tegra20_ac97_precious_reg,
 309         .cache_type = REGCACHE_RBTREE,
 310 };
 311
 312 static int tegra20_ac97_platform_probe(struct platform_device *pdev)
 313 {
 314         struct tegra20_ac97 *ac97;
 315         struct resource *mem;
 316         u32 of_dma[2];
 317         void __iomem *regs;
 318         int ret = 0;
 319
 320         ac97 = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_ac97),
 321                             GFP_KERNEL);
 322         if (!ac97) {
 323                 dev_err(&pdev->dev, "Can't allocate tegra20_ac97\n");
 324                 ret = -ENOMEM;
 325                 goto err;
 326         }
 327         dev_set_drvdata(&pdev->dev, ac97);
 328
 329         ac97->clk_ac97 = devm_clk_get(&pdev->dev, NULL);
 330         if (IS_ERR(ac97->clk_ac97)) {
 331                 dev_err(&pdev->dev, "Can't retrieve ac97 clock\n");
 332                 ret = PTR_ERR(ac97->clk_ac97);
 333                 goto err;
 334         }
 335
 336         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 337         regs = devm_ioremap_resource(&pdev->dev, mem);
 338         if (IS_ERR(regs)) {
 339                 ret = PTR_ERR(regs);
 340                 goto err_clk_put;
 341         }
 342
 343         ac97->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 344                                             &tegra20_ac97_regmap_config);
 345         if (IS_ERR(ac97->regmap)) {
 346                 dev_err(&pdev->dev, "regmap init failed\n");
 347                 ret = PTR_ERR(ac97->regmap);
 348                 goto err_clk_put;
 349         }
 350
 351         if (of_property_read_u32_array(pdev->dev.of_node,
 352                                        "nvidia,dma-request-selector",
 353                                        of_dma, 2) < 0) {
 354                 dev_err(&pdev->dev, "No DMA resource\n");
 355                 ret = -ENODEV;
 356                 goto err_clk_put;
 357         }
 358
 359         ac97->reset_gpio = of_get_named_gpio(pdev->dev.of_node,
 360                                              "nvidia,codec-reset-gpio", 0);
 361         if (gpio_is_valid(ac97->reset_gpio)) {
 362                 ret = devm_gpio_request_one(&pdev->dev, ac97->reset_gpio,
 363                                             GPIOF_OUT_INIT_HIGH, "codec-reset");
 364                 if (ret) {
 365                         dev_err(&pdev->dev, "could not get codec-reset GPIO\n");
 366                         goto err_clk_put;
 367                 }
 368         } else {
 369                 dev_err(&pdev->dev, "no codec-reset GPIO supplied\n");
 370                 goto err_clk_put;
 371         }
 372
 373         ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node,
 374                                             "nvidia,codec-sync-gpio", 0);
 375         if (!gpio_is_valid(ac97->sync_gpio)) {
 376                 dev_err(&pdev->dev, "no codec-sync GPIO supplied\n");
 377                 goto err_clk_put;
 378         }
 379
 380         ac97->capture_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_RX1;
 381         ac97->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 382         ac97->capture_dma_data.maxburst = 4;
 383         ac97->capture_dma_data.slave_id = of_dma[1];
 384
 385         ac97->playback_dma_data.addr = mem->start + TEGRA20_AC97_FIFO_TX1;
 386         ac97->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 387         ac97->playback_dma_data.maxburst = 4;
 388         ac97->playback_dma_data.slave_id = of_dma[1];
 389
 390         ret = tegra_asoc_utils_init(&ac97->util_data, &pdev->dev);
 391         if (ret)
 392                 goto err_clk_put;
 393
 394         ret = tegra_asoc_utils_set_ac97_rate(&ac97->util_data);
 395         if (ret)
 396                 goto err_asoc_utils_fini;
 397
 398         ret = clk_prepare_enable(ac97->clk_ac97);
 399         if (ret) {
 400                 dev_err(&pdev->dev, "clk_enable failed: %d\n", ret);
 401                 goto err_asoc_utils_fini;
 402         }
 403
 404         ret = snd_soc_set_ac97_ops(&tegra20_ac97_ops);
 405         if (ret) {
 406                 dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
 407                 goto err_asoc_utils_fini;
 408         }
 409
 410         ret = snd_soc_register_component(&pdev->dev, &tegra20_ac97_component,
 411                                          &tegra20_ac97_dai, 1);
 412         if (ret) {
 413                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 414                 ret = -ENOMEM;
 415                 goto err_asoc_utils_fini;
 416         }
 417
 418         ret = tegra_pcm_platform_register(&pdev->dev);
 419         if (ret) {
 420                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 421                 goto err_unregister_component;
 422         }
 423
 424         /* XXX: crufty ASoC AC97 API - only one AC97 codec allowed */
 425         workdata = ac97;
 426
 427         return 0;
 428
 429 err_unregister_component:
 430         snd_soc_unregister_component(&pdev->dev);
 431 err_asoc_utils_fini:
 432         tegra_asoc_utils_fini(&ac97->util_data);
 433 err_clk_put:
 434 err:
 435         snd_soc_set_ac97_ops(NULL);
 436         return ret;
 437 }
 438
 439 static int tegra20_ac97_platform_remove(struct platform_device *pdev)
 440 {
 441         struct tegra20_ac97 *ac97 = dev_get_drvdata(&pdev->dev);
 442
 443         tegra_pcm_platform_unregister(&pdev->dev);
 444         snd_soc_unregister_component(&pdev->dev);
 445
 446         tegra_asoc_utils_fini(&ac97->util_data);
 447
 448         clk_disable_unprepare(ac97->clk_ac97);
 449
 450         snd_soc_set_ac97_ops(NULL);
 451
 452         return 0;
 453 }
 454
 455 static const struct of_device_id tegra20_ac97_of_match[] = {
 456         { .compatible = "nvidia,tegra20-ac97", },
 457         {},
 458 };
 459
 460 static struct platform_driver tegra20_ac97_driver = {
 461         .driver = {
 462                 .name = DRV_NAME,
 463                 .owner = THIS_MODULE,
 464                 .of_match_table = tegra20_ac97_of_match,
 465         },
 466         .probe = tegra20_ac97_platform_probe,
 467         .remove = tegra20_ac97_platform_remove,
 468 };
 469 module_platform_driver(tegra20_ac97_driver);
 470
 471 MODULE_AUTHOR("Lucas Stach");
 472 MODULE_DESCRIPTION("Tegra20 AC97 ASoC driver");
 473 MODULE_LICENSE("GPL v2");
 474 MODULE_ALIAS("platform:" DRV_NAME);
 475 MODULE_DEVICE_TABLE(of, tegra20_ac97_of_match);