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
  23 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  24
  25 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  26 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  27 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  28
  29 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  30 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  31
  32 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  33 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  34
  35 /*
  36  * Set the DMACR register in the GUTS
  37  *
  38  * The DMACR register determines the source of initiated transfers for each
  39  * channel on each DMA controller.  Rather than have a bunch of repetitive
  40  * macros for the bit patterns, we just have a function that calculates
  41  * them.
  42  *
  43  * guts: Pointer to GUTS structure
  44  * co: The DMA controller (0 or 1)
  45  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  46  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  47  */
  48 static inline void guts_set_dmuxcr(struct ccsr_guts_85xx __iomem *guts,
  49         unsigned int co, unsigned int ch, unsigned int device)
  50 {
  51         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  52
  53         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  54 }
  55
  56 /* There's only one global utilities register */
  57 static phys_addr_t guts_phys;
  58
  59 #define DAI_NAME_SIZE   32
  60
  61 /**
  62  * machine_data: machine-specific ASoC device data
  63  *
  64  * This structure contains data for a single sound platform device on an
  65  * P1022 DS.  Some of the data is taken from the device tree.
  66  */
  67 struct machine_data {
  68         struct snd_soc_dai_link dai[2];
  69         struct snd_soc_card card;
  70         unsigned int dai_format;
  71         unsigned int codec_clk_direction;
  72         unsigned int cpu_clk_direction;
  73         unsigned int clk_frequency;
  74         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  75         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  76         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  77         char codec_name[DAI_NAME_SIZE];
  78         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  79 };
  80
  81 /**
  82  * p1022_ds_machine_probe: initialize the board
  83  *
  84  * This function is used to initialize the board-specific hardware.
  85  *
  86  * Here we program the DMACR and PMUXCR registers.
  87  */
  88 static int p1022_ds_machine_probe(struct platform_device *sound_device)
  89 {
  90         struct snd_soc_card *card = platform_get_drvdata(sound_device);
  91         struct machine_data *mdata =
  92                 container_of(card, struct machine_data, card);
  93         struct ccsr_guts_85xx __iomem *guts;
  94
  95         guts = ioremap(guts_phys, sizeof(struct ccsr_guts_85xx));
  96         if (!guts) {
  97                 dev_err(card->dev, "could not map global utilities\n");
  98                 return -ENOMEM;
  99         }
 100
 101         /* Enable SSI Tx signal */
 102         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
 103                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
 104
 105         /* Enable SSI Rx signal */
 106         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 107                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
 108
 109         /* Enable DMA Channel for SSI */
 110         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 111                         CCSR_GUTS_DMUXCR_SSI);
 112
 113         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 114                         CCSR_GUTS_DMUXCR_SSI);
 115
 116         iounmap(guts);
 117
 118         return 0;
 119 }
 120
 121 /**
 122  * p1022_ds_startup: program the board with various hardware parameters
 123  *
 124  * This function takes board-specific information, like clock frequencies
 125  * and serial data formats, and passes that information to the codec and
 126  * transport drivers.
 127  */
 128 static int p1022_ds_startup(struct snd_pcm_substream *substream)
 129 {
 130         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 131         struct machine_data *mdata =
 132                 container_of(rtd->card, struct machine_data, card);
 133         struct device *dev = rtd->card->dev;
 134         int ret = 0;
 135
 136         /* Tell the codec driver what the serial protocol is. */
 137         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
 138         if (ret < 0) {
 139                 dev_err(dev, "could not set codec driver audio format\n");
 140                 return ret;
 141         }
 142
 143         /*
 144          * Tell the codec driver what the MCLK frequency is, and whether it's
 145          * a slave or master.
 146          */
 147         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
 148                                      mdata->codec_clk_direction);
 149         if (ret < 0) {
 150                 dev_err(dev, "could not set codec driver clock params\n");
 151                 return ret;
 152         }
 153
 154         return 0;
 155 }
 156
 157 /**
 158  * p1022_ds_machine_remove: Remove the sound device
 159  *
 160  * This function is called to remove the sound device for one SSI.  We
 161  * de-program the DMACR and PMUXCR register.
 162  */
 163 static int p1022_ds_machine_remove(struct platform_device *sound_device)
 164 {
 165         struct snd_soc_card *card = platform_get_drvdata(sound_device);
 166         struct machine_data *mdata =
 167                 container_of(card, struct machine_data, card);
 168         struct ccsr_guts_85xx __iomem *guts;
 169
 170         guts = ioremap(guts_phys, sizeof(struct ccsr_guts_85xx));
 171         if (!guts) {
 172                 dev_err(card->dev, "could not map global utilities\n");
 173                 return -ENOMEM;
 174         }
 175
 176         /* Restore the signal routing */
 177         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 178         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 179         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 180         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
 181
 182         iounmap(guts);
 183
 184         return 0;
 185 }
 186
 187 /**
 188  * p1022_ds_ops: ASoC machine driver operations
 189  */
 190 static struct snd_soc_ops p1022_ds_ops = {
 191         .startup = p1022_ds_startup,
 192 };
 193
 194 /**
 195  * get_node_by_phandle_name - get a node by its phandle name
 196  *
 197  * This function takes a node, the name of a property in that node, and a
 198  * compatible string.  Assuming the property is a phandle to another node,
 199  * it returns that node, (optionally) if that node is compatible.
 200  *
 201  * If the property is not a phandle, or the node it points to is not compatible
 202  * with the specific string, then NULL is returned.
 203  */
 204 static struct device_node *get_node_by_phandle_name(struct device_node *np,
 205         const char *name, const char *compatible)
 206 {
 207         np = of_parse_phandle(np, name, 0);
 208         if (!np)
 209                 return NULL;
 210
 211         if (!of_device_is_compatible(np, compatible)) {
 212                 of_node_put(np);
 213                 return NULL;
 214         }
 215
 216         return np;
 217 }
 218
 219 /**
 220  * get_parent_cell_index -- return the cell-index of the parent of a node
 221  *
 222  * Return the value of the cell-index property of the parent of the given
 223  * node.  This is used for DMA channel nodes that need to know the DMA ID
 224  * of the controller they are on.
 225  */
 226 static int get_parent_cell_index(struct device_node *np)
 227 {
 228         struct device_node *parent = of_get_parent(np);
 229         const u32 *iprop;
 230         int ret = -1;
 231
 232         if (!parent)
 233                 return -1;
 234
 235         iprop = of_get_property(parent, "cell-index", NULL);
 236         if (iprop)
 237                 ret = *iprop;
 238
 239         of_node_put(parent);
 240
 241         return ret;
 242 }
 243
 244 /**
 245  * codec_node_dev_name - determine the dev_name for a codec node
 246  *
 247  * This function determines the dev_name for an I2C node.  This is the name
 248  * that would be returned by dev_name() if this device_node were part of a
 249  * 'struct device'  It's ugly and hackish, but it works.
 250  *
 251  * The dev_name for such devices include the bus number and I2C address. For
 252  * example, "cs4270-codec.0-004f".
 253  */
 254 static int codec_node_dev_name(struct device_node *np, char *buf, size_t len)
 255 {
 256         const u32 *iprop;
 257         int bus, addr;
 258         char temp[DAI_NAME_SIZE];
 259
 260         of_modalias_node(np, temp, DAI_NAME_SIZE);
 261
 262         iprop = of_get_property(np, "reg", NULL);
 263         if (!iprop)
 264                 return -EINVAL;
 265
 266         addr = *iprop;
 267
 268         bus = get_parent_cell_index(np);
 269         if (bus < 0)
 270                 return bus;
 271
 272         snprintf(buf, len, "%s-codec.%u-%04x", temp, bus, addr);
 273
 274         return 0;
 275 }
 276
 277 static int get_dma_channel(struct device_node *ssi_np,
 278                            const char *compatible,
 279                            struct snd_soc_dai_link *dai,
 280                            unsigned int *dma_channel_id,
 281                            unsigned int *dma_id)
 282 {
 283         struct resource res;
 284         struct device_node *dma_channel_np;
 285         const u32 *iprop;
 286         int ret;
 287
 288         dma_channel_np = get_node_by_phandle_name(ssi_np, compatible,
 289                                                   "fsl,ssi-dma-channel");
 290         if (!dma_channel_np)
 291                 return -EINVAL;
 292
 293         /* Determine the dev_name for the device_node.  This code mimics the
 294          * behavior of of_device_make_bus_id(). We need this because ASoC uses
 295          * the dev_name() of the device to match the platform (DMA) device with
 296          * the CPU (SSI) device.  It's all ugly and hackish, but it works (for
 297          * now).
 298          *
 299          * dai->platform name should already point to an allocated buffer.
 300          */
 301         ret = of_address_to_resource(dma_channel_np, 0, &res);
 302         if (ret)
 303                 return ret;
 304         snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
 305                  (unsigned long long) res.start, dma_channel_np->name);
 306
 307         iprop = of_get_property(dma_channel_np, "cell-index", NULL);
 308         if (!iprop) {
 309                 of_node_put(dma_channel_np);
 310                 return -EINVAL;
 311         }
 312
 313         *dma_channel_id = *iprop;
 314         *dma_id = get_parent_cell_index(dma_channel_np);
 315         of_node_put(dma_channel_np);
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * p1022_ds_probe: platform probe function for the machine driver
 322  *
 323  * Although this is a machine driver, the SSI node is the "master" node with
 324  * respect to audio hardware connections.  Therefore, we create a new ASoC
 325  * device for each new SSI node that has a codec attached.
 326  */
 327 static int p1022_ds_probe(struct platform_device *pdev)
 328 {
 329         struct device *dev = pdev->dev.parent;
 330         /* ssi_pdev is the platform device for the SSI node that probed us */
 331         struct platform_device *ssi_pdev =
 332                 container_of(dev, struct platform_device, dev);
 333         struct device_node *np = ssi_pdev->dev.of_node;
 334         struct device_node *codec_np = NULL;
 335         struct platform_device *sound_device = NULL;
 336         struct machine_data *mdata;
 337         int ret = -ENODEV;
 338         const char *sprop;
 339         const u32 *iprop;
 340
 341         /* Find the codec node for this SSI. */
 342         codec_np = of_parse_phandle(np, "codec-handle", 0);
 343         if (!codec_np) {
 344                 dev_err(dev, "could not find codec node\n");
 345                 return -EINVAL;
 346         }
 347
 348         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
 349         if (!mdata) {
 350                 ret = -ENOMEM;
 351                 goto error_put;
 352         }
 353
 354         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 355         mdata->dai[0].ops = &p1022_ds_ops;
 356
 357         /* Determine the codec name, it will be used as the codec DAI name */
 358         ret = codec_node_dev_name(codec_np, mdata->codec_name, DAI_NAME_SIZE);
 359         if (ret) {
 360                 dev_err(&pdev->dev, "invalid codec node %s\n",
 361                         codec_np->full_name);
 362                 ret = -EINVAL;
 363                 goto error;
 364         }
 365         mdata->dai[0].codec_name = mdata->codec_name;
 366
 367         /* We register two DAIs per SSI, one for playback and the other for
 368          * capture.  We support codecs that have separate DAIs for both playback
 369          * and capture.
 370          */
 371         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 372
 373         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 374         mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
 375         mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
 376
 377         /* Get the device ID */
 378         iprop = of_get_property(np, "cell-index", NULL);
 379         if (!iprop) {
 380                 dev_err(&pdev->dev, "cell-index property not found\n");
 381                 ret = -EINVAL;
 382                 goto error;
 383         }
 384         mdata->ssi_id = *iprop;
 385
 386         /* Get the serial format and clock direction. */
 387         sprop = of_get_property(np, "fsl,mode", NULL);
 388         if (!sprop) {
 389                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 390                 ret = -EINVAL;
 391                 goto error;
 392         }
 393
 394         if (strcasecmp(sprop, "i2s-slave") == 0) {
 395                 mdata->dai_format = SND_SOC_DAIFMT_I2S;
 396                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 397                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 398
 399                 /* In i2s-slave mode, the codec has its own clock source, so we
 400                  * need to get the frequency from the device tree and pass it to
 401                  * the codec driver.
 402                  */
 403                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 404                 if (!iprop || !*iprop) {
 405                         dev_err(&pdev->dev, "codec bus-frequency "
 406                                 "property is missing or invalid\n");
 407                         ret = -EINVAL;
 408                         goto error;
 409                 }
 410                 mdata->clk_frequency = *iprop;
 411         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 412                 mdata->dai_format = SND_SOC_DAIFMT_I2S;
 413                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 414                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 415         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 416                 mdata->dai_format = SND_SOC_DAIFMT_LEFT_J;
 417                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 418                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 419         } else if (strcasecmp(sprop, "lj-master") == 0) {
 420                 mdata->dai_format = SND_SOC_DAIFMT_LEFT_J;
 421                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 422                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 423         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 424                 mdata->dai_format = SND_SOC_DAIFMT_RIGHT_J;
 425                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 426                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 427         } else if (strcasecmp(sprop, "rj-master") == 0) {
 428                 mdata->dai_format = SND_SOC_DAIFMT_RIGHT_J;
 429                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 430                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 431         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 432                 mdata->dai_format = SND_SOC_DAIFMT_AC97;
 433                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 434                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 435         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 436                 mdata->dai_format = SND_SOC_DAIFMT_AC97;
 437                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 438                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 439         } else {
 440                 dev_err(&pdev->dev,
 441                         "unrecognized fsl,mode property '%s'\n", sprop);
 442                 ret = -EINVAL;
 443                 goto error;
 444         }
 445
 446         if (!mdata->clk_frequency) {
 447                 dev_err(&pdev->dev, "unknown clock frequency\n");
 448                 ret = -EINVAL;
 449                 goto error;
 450         }
 451
 452         /* Find the playback DMA channel to use. */
 453         mdata->dai[0].platform_name = mdata->platform_name[0];
 454         ret = get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 455                               &mdata->dma_channel_id[0],
 456                               &mdata->dma_id[0]);
 457         if (ret) {
 458                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 459                 goto error;
 460         }
 461
 462         /* Find the capture DMA channel to use. */
 463         mdata->dai[1].platform_name = mdata->platform_name[1];
 464         ret = get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 465                               &mdata->dma_channel_id[1],
 466                               &mdata->dma_id[1]);
 467         if (ret) {
 468                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 469                 goto error;
 470         }
 471
 472         /* Initialize our DAI data structure.  */
 473         mdata->dai[0].stream_name = "playback";
 474         mdata->dai[1].stream_name = "capture";
 475         mdata->dai[0].name = mdata->dai[0].stream_name;
 476         mdata->dai[1].name = mdata->dai[1].stream_name;
 477
 478         mdata->card.probe = p1022_ds_machine_probe;
 479         mdata->card.remove = p1022_ds_machine_remove;
 480         mdata->card.name = pdev->name; /* The platform driver name */
 481         mdata->card.num_links = 2;
 482         mdata->card.dai_link = mdata->dai;
 483
 484         /* Allocate a new audio platform device structure */
 485         sound_device = platform_device_alloc("soc-audio", -1);
 486         if (!sound_device) {
 487                 dev_err(&pdev->dev, "platform device alloc failed\n");
 488                 ret = -ENOMEM;
 489                 goto error;
 490         }
 491
 492         /* Associate the card data with the sound device */
 493         platform_set_drvdata(sound_device, &mdata->card);
 494
 495         /* Register with ASoC */
 496         ret = platform_device_add(sound_device);
 497         if (ret) {
 498                 dev_err(&pdev->dev, "platform device add failed\n");
 499                 goto error;
 500         }
 501         dev_set_drvdata(&pdev->dev, sound_device);
 502
 503         of_node_put(codec_np);
 504
 505         return 0;
 506
 507 error:
 508         if (sound_device)
 509                 platform_device_unregister(sound_device);
 510
 511         kfree(mdata);
 512 error_put:
 513         of_node_put(codec_np);
 514         return ret;
 515 }
 516
 517 /**
 518  * p1022_ds_remove: remove the platform device
 519  *
 520  * This function is called when the platform device is removed.
 521  */
 522 static int __devexit p1022_ds_remove(struct platform_device *pdev)
 523 {
 524         struct platform_device *sound_device = dev_get_drvdata(&pdev->dev);
 525         struct snd_soc_card *card = platform_get_drvdata(sound_device);
 526         struct machine_data *mdata =
 527                 container_of(card, struct machine_data, card);
 528
 529         platform_device_unregister(sound_device);
 530
 531         kfree(mdata);
 532         sound_device->dev.platform_data = NULL;
 533
 534         dev_set_drvdata(&pdev->dev, NULL);
 535
 536         return 0;
 537 }
 538
 539 static struct platform_driver p1022_ds_driver = {
 540         .probe = p1022_ds_probe,
 541         .remove = __devexit_p(p1022_ds_remove),
 542         .driver = {
 543                 /* The name must match the 'model' property in the device tree,
 544                  * in lowercase letters, but only the part after that last
 545                  * comma.  This is because some model properties have a "fsl,"
 546                  * prefix.
 547                  */
 548                 .name = "snd-soc-p1022",
 549                 .owner = THIS_MODULE,
 550         },
 551 };
 552
 553 /**
 554  * p1022_ds_init: machine driver initialization.
 555  *
 556  * This function is called when this module is loaded.
 557  */
 558 static int __init p1022_ds_init(void)
 559 {
 560         struct device_node *guts_np;
 561         struct resource res;
 562
 563         pr_info("Freescale P1022 DS ALSA SoC machine driver\n");
 564
 565         /* Get the physical address of the global utilities registers */
 566         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 567         if (of_address_to_resource(guts_np, 0, &res)) {
 568                 pr_err("p1022-ds: missing/invalid global utilities node\n");
 569                 return -EINVAL;
 570         }
 571         guts_phys = res.start;
 572         of_node_put(guts_np);
 573
 574         return platform_driver_register(&p1022_ds_driver);
 575 }
 576
 577 /**
 578  * p1022_ds_exit: machine driver exit
 579  *
 580  * This function is called when this driver is unloaded.
 581  */
 582 static void __exit p1022_ds_exit(void)
 583 {
 584         platform_driver_unregister(&p1022_ds_driver);
 585 }
 586
 587 module_init(p1022_ds_init);
 588 module_exit(p1022_ds_exit);
 589
 590 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 591 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
 592 MODULE_LICENSE("GPL v2");