sound/soc/fsl/p1022_ds.c

   1 /**
   2  * Freescale P1022DS ALSA SoC Machine driver
   3  *
   4  * Author: Timur Tabi <timur@freescale.com>
   5  *
   6  * Copyright 2010 Freescale Semiconductor, Inc.
   7  *
   8  * This file is licensed under the terms of the GNU General Public License
   9  * version 2.  This program is licensed "as is" without any warranty of any
  10  * kind, whether express or implied.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/of_device.h>
  16 #include <linux/slab.h>
  17 #include <sound/soc.h>
  18 #include <asm/fsl_guts.h>
  19
  20 #include "fsl_dma.h"
  21 #include "fsl_ssi.h"
  22 #include "fsl_utils.h"
  23
  24 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  25
  26 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  27 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  28 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  29
  30 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  31 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  32
  33 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  34 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  35
  36 /*
  37  * Set the DMACR register in the GUTS
  38  *
  39  * The DMACR register determines the source of initiated transfers for each
  40  * channel on each DMA controller.  Rather than have a bunch of repetitive
  41  * macros for the bit patterns, we just have a function that calculates
  42  * them.
  43  *
  44  * guts: Pointer to GUTS structure
  45  * co: The DMA controller (0 or 1)
  46  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  47  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  48  */
  49 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
  50         unsigned int co, unsigned int ch, unsigned int device)
  51 {
  52         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  53
  54         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  55 }
  56
  57 /* There's only one global utilities register */
  58 static phys_addr_t guts_phys;
  59
  60 /**
  61  * machine_data: machine-specific ASoC device data
  62  *
  63  * This structure contains data for a single sound platform device on an
  64  * P1022 DS.  Some of the data is taken from the device tree.
  65  */
  66 struct machine_data {
  67         struct snd_soc_dai_link dai[2];
  68         struct snd_soc_card card;
  69         unsigned int dai_format;
  70         unsigned int codec_clk_direction;
  71         unsigned int cpu_clk_direction;
  72         unsigned int clk_frequency;
  73         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  74         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  75         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  76         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  77 };
  78
  79 /**
  80  * p1022_ds_machine_probe: initialize the board
  81  *
  82  * This function is used to initialize the board-specific hardware.
  83  *
  84  * Here we program the DMACR and PMUXCR registers.
  85  */
  86 static int p1022_ds_machine_probe(struct snd_soc_card *card)
  87 {
  88         struct machine_data *mdata =
  89                 container_of(card, struct machine_data, card);
  90         struct ccsr_guts __iomem *guts;
  91
  92         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
  93         if (!guts) {
  94                 dev_err(card->dev, "could not map global utilities\n");
  95                 return -ENOMEM;
  96         }
  97
  98         /* Enable SSI Tx signal */
  99         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
 100                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
 101
 102         /* Enable SSI Rx signal */
 103         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 104                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
 105
 106         /* Enable DMA Channel for SSI */
 107         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 108                         CCSR_GUTS_DMUXCR_SSI);
 109
 110         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 111                         CCSR_GUTS_DMUXCR_SSI);
 112
 113         iounmap(guts);
 114
 115         return 0;
 116 }
 117
 118 /**
 119  * p1022_ds_startup: program the board with various hardware parameters
 120  *
 121  * This function takes board-specific information, like clock frequencies
 122  * and serial data formats, and passes that information to the codec and
 123  * transport drivers.
 124  */
 125 static int p1022_ds_startup(struct snd_pcm_substream *substream)
 126 {
 127         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 128         struct machine_data *mdata =
 129                 container_of(rtd->card, struct machine_data, card);
 130         struct device *dev = rtd->card->dev;
 131         int ret = 0;
 132
 133         /* Tell the codec driver what the serial protocol is. */
 134         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
 135         if (ret < 0) {
 136                 dev_err(dev, "could not set codec driver audio format\n");
 137                 return ret;
 138         }
 139
 140         /*
 141          * Tell the codec driver what the MCLK frequency is, and whether it's
 142          * a slave or master.
 143          */
 144         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
 145                                      mdata->codec_clk_direction);
 146         if (ret < 0) {
 147                 dev_err(dev, "could not set codec driver clock params\n");
 148                 return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 /**
 155  * p1022_ds_machine_remove: Remove the sound device
 156  *
 157  * This function is called to remove the sound device for one SSI.  We
 158  * de-program the DMACR and PMUXCR register.
 159  */
 160 static int p1022_ds_machine_remove(struct snd_soc_card *card)
 161 {
 162         struct machine_data *mdata =
 163                 container_of(card, struct machine_data, card);
 164         struct ccsr_guts __iomem *guts;
 165
 166         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 167         if (!guts) {
 168                 dev_err(card->dev, "could not map global utilities\n");
 169                 return -ENOMEM;
 170         }
 171
 172         /* Restore the signal routing */
 173         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 174         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 175         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 176         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
 177
 178         iounmap(guts);
 179
 180         return 0;
 181 }
 182
 183 /**
 184  * p1022_ds_ops: ASoC machine driver operations
 185  */
 186 static struct snd_soc_ops p1022_ds_ops = {
 187         .startup = p1022_ds_startup,
 188 };
 189
 190 /**
 191  * p1022_ds_probe: platform probe function for the machine driver
 192  *
 193  * Although this is a machine driver, the SSI node is the "master" node with
 194  * respect to audio hardware connections.  Therefore, we create a new ASoC
 195  * device for each new SSI node that has a codec attached.
 196  */
 197 static int p1022_ds_probe(struct platform_device *pdev)
 198 {
 199         struct device *dev = pdev->dev.parent;
 200         /* ssi_pdev is the platform device for the SSI node that probed us */
 201         struct platform_device *ssi_pdev =
 202                 container_of(dev, struct platform_device, dev);
 203         struct device_node *np = ssi_pdev->dev.of_node;
 204         struct device_node *codec_np = NULL;
 205         struct platform_device *sound_device = NULL;
 206         struct machine_data *mdata;
 207         int ret = -ENODEV;
 208         const char *sprop;
 209         const u32 *iprop;
 210
 211         /* Find the codec node for this SSI. */
 212         codec_np = of_parse_phandle(np, "codec-handle", 0);
 213         if (!codec_np) {
 214                 dev_err(dev, "could not find codec node\n");
 215                 return -EINVAL;
 216         }
 217
 218         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
 219         if (!mdata) {
 220                 ret = -ENOMEM;
 221                 goto error_put;
 222         }
 223
 224         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 225         mdata->dai[0].ops = &p1022_ds_ops;
 226
 227         /* ASoC core can match codec with device node */
 228         mdata->dai[0].codec_of_node = codec_np;
 229
 230         /* We register two DAIs per SSI, one for playback and the other for
 231          * capture.  We support codecs that have separate DAIs for both playback
 232          * and capture.
 233          */
 234         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 235
 236         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 237         mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
 238         mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
 239
 240         /* Get the device ID */
 241         iprop = of_get_property(np, "cell-index", NULL);
 242         if (!iprop) {
 243                 dev_err(&pdev->dev, "cell-index property not found\n");
 244                 ret = -EINVAL;
 245                 goto error;
 246         }
 247         mdata->ssi_id = be32_to_cpup(iprop);
 248
 249         /* Get the serial format and clock direction. */
 250         sprop = of_get_property(np, "fsl,mode", NULL);
 251         if (!sprop) {
 252                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 253                 ret = -EINVAL;
 254                 goto error;
 255         }
 256
 257         if (strcasecmp(sprop, "i2s-slave") == 0) {
 258                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 259                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 260                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 261                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 262
 263                 /* In i2s-slave mode, the codec has its own clock source, so we
 264                  * need to get the frequency from the device tree and pass it to
 265                  * the codec driver.
 266                  */
 267                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 268                 if (!iprop || !*iprop) {
 269                         dev_err(&pdev->dev, "codec bus-frequency "
 270                                 "property is missing or invalid\n");
 271                         ret = -EINVAL;
 272                         goto error;
 273                 }
 274                 mdata->clk_frequency = be32_to_cpup(iprop);
 275         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 276                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 277                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 278                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 279                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 280         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 281                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 282                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 283                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 284                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 285         } else if (strcasecmp(sprop, "lj-master") == 0) {
 286                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 287                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 288                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 289                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 290         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 291                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 292                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 293                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 294                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 295         } else if (strcasecmp(sprop, "rj-master") == 0) {
 296                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 297                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 298                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 299                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 300         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 301                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 302                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 303                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 304                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 305         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 306                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 307                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 308                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 309                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 310         } else {
 311                 dev_err(&pdev->dev,
 312                         "unrecognized fsl,mode property '%s'\n", sprop);
 313                 ret = -EINVAL;
 314                 goto error;
 315         }
 316
 317         if (!mdata->clk_frequency) {
 318                 dev_err(&pdev->dev, "unknown clock frequency\n");
 319                 ret = -EINVAL;
 320                 goto error;
 321         }
 322
 323         /* Find the playback DMA channel to use. */
 324         mdata->dai[0].platform_name = mdata->platform_name[0];
 325         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 326                                        &mdata->dma_channel_id[0],
 327                                        &mdata->dma_id[0]);
 328         if (ret) {
 329                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 330                 goto error;
 331         }
 332
 333         /* Find the capture DMA channel to use. */
 334         mdata->dai[1].platform_name = mdata->platform_name[1];
 335         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 336                                        &mdata->dma_channel_id[1],
 337                                        &mdata->dma_id[1]);
 338         if (ret) {
 339                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 340                 goto error;
 341         }
 342
 343         /* Initialize our DAI data structure.  */
 344         mdata->dai[0].stream_name = "playback";
 345         mdata->dai[1].stream_name = "capture";
 346         mdata->dai[0].name = mdata->dai[0].stream_name;
 347         mdata->dai[1].name = mdata->dai[1].stream_name;
 348
 349         mdata->card.probe = p1022_ds_machine_probe;
 350         mdata->card.remove = p1022_ds_machine_remove;
 351         mdata->card.name = pdev->name; /* The platform driver name */
 352         mdata->card.num_links = 2;
 353         mdata->card.dai_link = mdata->dai;
 354
 355         /* Allocate a new audio platform device structure */
 356         sound_device = platform_device_alloc("soc-audio", -1);
 357         if (!sound_device) {
 358                 dev_err(&pdev->dev, "platform device alloc failed\n");
 359                 ret = -ENOMEM;
 360                 goto error;
 361         }
 362
 363         /* Associate the card data with the sound device */
 364         platform_set_drvdata(sound_device, &mdata->card);
 365
 366         /* Register with ASoC */
 367         ret = platform_device_add(sound_device);
 368         if (ret) {
 369                 dev_err(&pdev->dev, "platform device add failed\n");
 370                 goto error;
 371         }
 372         dev_set_drvdata(&pdev->dev, sound_device);
 373
 374         of_node_put(codec_np);
 375
 376         return 0;
 377
 378 error:
 379         if (sound_device)
 380                 platform_device_put(sound_device);
 381
 382         kfree(mdata);
 383 error_put:
 384         of_node_put(codec_np);
 385         return ret;
 386 }
 387
 388 /**
 389  * p1022_ds_remove: remove the platform device
 390  *
 391  * This function is called when the platform device is removed.
 392  */
 393 static int __devexit p1022_ds_remove(struct platform_device *pdev)
 394 {
 395         struct platform_device *sound_device = dev_get_drvdata(&pdev->dev);
 396         struct snd_soc_card *card = platform_get_drvdata(sound_device);
 397         struct machine_data *mdata =
 398                 container_of(card, struct machine_data, card);
 399
 400         platform_device_unregister(sound_device);
 401
 402         kfree(mdata);
 403         sound_device->dev.platform_data = NULL;
 404
 405         dev_set_drvdata(&pdev->dev, NULL);
 406
 407         return 0;
 408 }
 409
 410 static struct platform_driver p1022_ds_driver = {
 411         .probe = p1022_ds_probe,
 412         .remove = __devexit_p(p1022_ds_remove),
 413         .driver = {
 414                 /*
 415                  * The name must match 'compatible' property in the device tree,
 416                  * in lowercase letters.
 417                  */
 418                 .name = "snd-soc-p1022ds",
 419                 .owner = THIS_MODULE,
 420         },
 421 };
 422
 423 /**
 424  * p1022_ds_init: machine driver initialization.
 425  *
 426  * This function is called when this module is loaded.
 427  */
 428 static int __init p1022_ds_init(void)
 429 {
 430         struct device_node *guts_np;
 431         struct resource res;
 432
 433         /* Get the physical address of the global utilities registers */
 434         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 435         if (of_address_to_resource(guts_np, 0, &res)) {
 436                 pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
 437                 of_node_put(guts_np);
 438                 return -EINVAL;
 439         }
 440         guts_phys = res.start;
 441         of_node_put(guts_np);
 442
 443         return platform_driver_register(&p1022_ds_driver);
 444 }
 445
 446 /**
 447  * p1022_ds_exit: machine driver exit
 448  *
 449  * This function is called when this driver is unloaded.
 450  */
 451 static void __exit p1022_ds_exit(void)
 452 {
 453         platform_driver_unregister(&p1022_ds_driver);
 454 }
 455
 456 module_init(p1022_ds_init);
 457 module_exit(p1022_ds_exit);
 458
 459 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 460 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
 461 MODULE_LICENSE("GPL v2");