sound/soc/fsl/mpc8610_hpcd.c

   1 /**
   2  * Freescale MPC8610HPCD ALSA SoC Machine driver
   3  *
   4  * Author: Timur Tabi <timur@freescale.com>
   5  *
   6  * Copyright 2007-2010 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 /* There's only one global utilities register */
  24 static phys_addr_t guts_phys;
  25
  26 #define DAI_NAME_SIZE   32
  27
  28 /**
  29  * mpc8610_hpcd_data: machine-specific ASoC device data
  30  *
  31  * This structure contains data for a single sound platform device on an
  32  * MPC8610 HPCD.  Some of the data is taken from the device tree.
  33  */
  34 struct mpc8610_hpcd_data {
  35         struct snd_soc_dai_link dai[2];
  36         struct snd_soc_card card;
  37         unsigned int dai_format;
  38         unsigned int codec_clk_direction;
  39         unsigned int cpu_clk_direction;
  40         unsigned int clk_frequency;
  41         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  42         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  43         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  44         char codec_dai_name[DAI_NAME_SIZE];
  45         char codec_name[DAI_NAME_SIZE];
  46         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  47 };
  48
  49 /**
  50  * mpc8610_hpcd_machine_probe: initialize the board
  51  *
  52  * This function is used to initialize the board-specific hardware.
  53  *
  54  * Here we program the DMACR and PMUXCR registers.
  55  */
  56 static int mpc8610_hpcd_machine_probe(struct snd_soc_card *card)
  57 {
  58         struct mpc8610_hpcd_data *machine_data =
  59                 container_of(card, struct mpc8610_hpcd_data, card);
  60         struct ccsr_guts_86xx __iomem *guts;
  61
  62         guts = ioremap(guts_phys, sizeof(struct ccsr_guts_86xx));
  63         if (!guts) {
  64                 dev_err(card->dev, "could not map global utilities\n");
  65                 return -ENOMEM;
  66         }
  67
  68         /* Program the signal routing between the SSI and the DMA */
  69         guts_set_dmacr(guts, machine_data->dma_id[0],
  70                        machine_data->dma_channel_id[0],
  71                        CCSR_GUTS_DMACR_DEV_SSI);
  72         guts_set_dmacr(guts, machine_data->dma_id[1],
  73                        machine_data->dma_channel_id[1],
  74                        CCSR_GUTS_DMACR_DEV_SSI);
  75
  76         guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
  77                             machine_data->dma_channel_id[0], 0);
  78         guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
  79                             machine_data->dma_channel_id[1], 0);
  80
  81         switch (machine_data->ssi_id) {
  82         case 0:
  83                 clrsetbits_be32(&guts->pmuxcr,
  84                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
  85                 break;
  86         case 1:
  87                 clrsetbits_be32(&guts->pmuxcr,
  88                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
  89                 break;
  90         }
  91
  92         iounmap(guts);
  93
  94         return 0;
  95 }
  96
  97 /**
  98  * mpc8610_hpcd_startup: program the board with various hardware parameters
  99  *
 100  * This function takes board-specific information, like clock frequencies
 101  * and serial data formats, and passes that information to the codec and
 102  * transport drivers.
 103  */
 104 static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
 105 {
 106         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 107         struct mpc8610_hpcd_data *machine_data =
 108                 container_of(rtd->card, struct mpc8610_hpcd_data, card);
 109         struct device *dev = rtd->card->dev;
 110         int ret = 0;
 111
 112         /* Tell the codec driver what the serial protocol is. */
 113         ret = snd_soc_dai_set_fmt(rtd->codec_dai, machine_data->dai_format);
 114         if (ret < 0) {
 115                 dev_err(dev, "could not set codec driver audio format\n");
 116                 return ret;
 117         }
 118
 119         /*
 120          * Tell the codec driver what the MCLK frequency is, and whether it's
 121          * a slave or master.
 122          */
 123         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0,
 124                                      machine_data->clk_frequency,
 125                                      machine_data->codec_clk_direction);
 126         if (ret < 0) {
 127                 dev_err(dev, "could not set codec driver clock params\n");
 128                 return ret;
 129         }
 130
 131         return 0;
 132 }
 133
 134 /**
 135  * mpc8610_hpcd_machine_remove: Remove the sound device
 136  *
 137  * This function is called to remove the sound device for one SSI.  We
 138  * de-program the DMACR and PMUXCR register.
 139  */
 140 static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
 141 {
 142         struct mpc8610_hpcd_data *machine_data =
 143                 container_of(card, struct mpc8610_hpcd_data, card);
 144         struct ccsr_guts_86xx __iomem *guts;
 145
 146         guts = ioremap(guts_phys, sizeof(struct ccsr_guts_86xx));
 147         if (!guts) {
 148                 dev_err(card->dev, "could not map global utilities\n");
 149                 return -ENOMEM;
 150         }
 151
 152         /* Restore the signal routing */
 153
 154         guts_set_dmacr(guts, machine_data->dma_id[0],
 155                        machine_data->dma_channel_id[0], 0);
 156         guts_set_dmacr(guts, machine_data->dma_id[1],
 157                        machine_data->dma_channel_id[1], 0);
 158
 159         switch (machine_data->ssi_id) {
 160         case 0:
 161                 clrsetbits_be32(&guts->pmuxcr,
 162                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
 163                 break;
 164         case 1:
 165                 clrsetbits_be32(&guts->pmuxcr,
 166                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
 167                 break;
 168         }
 169
 170         iounmap(guts);
 171
 172         return 0;
 173 }
 174
 175 /**
 176  * mpc8610_hpcd_ops: ASoC machine driver operations
 177  */
 178 static struct snd_soc_ops mpc8610_hpcd_ops = {
 179         .startup = mpc8610_hpcd_startup,
 180 };
 181
 182 /**
 183  * get_node_by_phandle_name - get a node by its phandle name
 184  *
 185  * This function takes a node, the name of a property in that node, and a
 186  * compatible string.  Assuming the property is a phandle to another node,
 187  * it returns that node, (optionally) if that node is compatible.
 188  *
 189  * If the property is not a phandle, or the node it points to is not compatible
 190  * with the specific string, then NULL is returned.
 191  */
 192 static struct device_node *get_node_by_phandle_name(struct device_node *np,
 193                                                const char *name,
 194                                                const char *compatible)
 195 {
 196         const phandle *ph;
 197         int len;
 198
 199         ph = of_get_property(np, name, &len);
 200         if (!ph || (len != sizeof(phandle)))
 201                 return NULL;
 202
 203         np = of_find_node_by_phandle(*ph);
 204         if (!np)
 205                 return NULL;
 206
 207         if (compatible && !of_device_is_compatible(np, compatible)) {
 208                 of_node_put(np);
 209                 return NULL;
 210         }
 211
 212         return np;
 213 }
 214
 215 /**
 216  * get_parent_cell_index -- return the cell-index of the parent of a node
 217  *
 218  * Return the value of the cell-index property of the parent of the given
 219  * node.  This is used for DMA channel nodes that need to know the DMA ID
 220  * of the controller they are on.
 221  */
 222 static int get_parent_cell_index(struct device_node *np)
 223 {
 224         struct device_node *parent = of_get_parent(np);
 225         const u32 *iprop;
 226
 227         if (!parent)
 228                 return -1;
 229
 230         iprop = of_get_property(parent, "cell-index", NULL);
 231         of_node_put(parent);
 232
 233         if (!iprop)
 234                 return -1;
 235
 236         return be32_to_cpup(iprop);
 237 }
 238
 239 /**
 240  * codec_node_dev_name - determine the dev_name for a codec node
 241  *
 242  * This function determines the dev_name for an I2C node.  This is the name
 243  * that would be returned by dev_name() if this device_node were part of a
 244  * 'struct device'  It's ugly and hackish, but it works.
 245  *
 246  * The dev_name for such devices include the bus number and I2C address. For
 247  * example, "cs4270-codec.0-004f".
 248  */
 249 static int codec_node_dev_name(struct device_node *np, char *buf, size_t len)
 250 {
 251         const u32 *iprop;
 252         int bus, addr;
 253         char temp[DAI_NAME_SIZE];
 254
 255         of_modalias_node(np, temp, DAI_NAME_SIZE);
 256
 257         iprop = of_get_property(np, "reg", NULL);
 258         if (!iprop)
 259                 return -EINVAL;
 260
 261         addr = be32_to_cpup(iprop);
 262
 263         bus = get_parent_cell_index(np);
 264         if (bus < 0)
 265                 return bus;
 266
 267         snprintf(buf, len, "%s-codec.%u-%04x", temp, bus, addr);
 268
 269         return 0;
 270 }
 271
 272 static int get_dma_channel(struct device_node *ssi_np,
 273                            const char *compatible,
 274                            struct snd_soc_dai_link *dai,
 275                            unsigned int *dma_channel_id,
 276                            unsigned int *dma_id)
 277 {
 278         struct resource res;
 279         struct device_node *dma_channel_np;
 280         const u32 *iprop;
 281         int ret;
 282
 283         dma_channel_np = get_node_by_phandle_name(ssi_np, compatible,
 284                                                   "fsl,ssi-dma-channel");
 285         if (!dma_channel_np)
 286                 return -EINVAL;
 287
 288         /* Determine the dev_name for the device_node.  This code mimics the
 289          * behavior of of_device_make_bus_id(). We need this because ASoC uses
 290          * the dev_name() of the device to match the platform (DMA) device with
 291          * the CPU (SSI) device.  It's all ugly and hackish, but it works (for
 292          * now).
 293          *
 294          * dai->platform name should already point to an allocated buffer.
 295          */
 296         ret = of_address_to_resource(dma_channel_np, 0, &res);
 297         if (ret)
 298                 return ret;
 299         snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
 300                  (unsigned long long) res.start, dma_channel_np->name);
 301
 302         iprop = of_get_property(dma_channel_np, "cell-index", NULL);
 303         if (!iprop) {
 304                 of_node_put(dma_channel_np);
 305                 return -EINVAL;
 306         }
 307
 308         *dma_channel_id = be32_to_cpup(iprop);
 309         *dma_id = get_parent_cell_index(dma_channel_np);
 310         of_node_put(dma_channel_np);
 311
 312         return 0;
 313 }
 314
 315 /**
 316  * mpc8610_hpcd_probe: platform probe function for the machine driver
 317  *
 318  * Although this is a machine driver, the SSI node is the "master" node with
 319  * respect to audio hardware connections.  Therefore, we create a new ASoC
 320  * device for each new SSI node that has a codec attached.
 321  */
 322 static int mpc8610_hpcd_probe(struct platform_device *pdev)
 323 {
 324         struct device *dev = pdev->dev.parent;
 325         /* ssi_pdev is the platform device for the SSI node that probed us */
 326         struct platform_device *ssi_pdev =
 327                 container_of(dev, struct platform_device, dev);
 328         struct device_node *np = ssi_pdev->dev.of_node;
 329         struct device_node *codec_np = NULL;
 330         struct platform_device *sound_device = NULL;
 331         struct mpc8610_hpcd_data *machine_data;
 332         int ret = -ENODEV;
 333         const char *sprop;
 334         const u32 *iprop;
 335
 336         /* We are only interested in SSIs with a codec phandle in them,
 337          * so let's make sure this SSI has one. The MPC8610 HPCD only
 338          * knows about the CS4270 codec, so reject anything else.
 339          */
 340         codec_np = get_node_by_phandle_name(np, "codec-handle",
 341                                             "cirrus,cs4270");
 342         if (!codec_np) {
 343                 dev_err(dev, "invalid codec node\n");
 344                 return -EINVAL;
 345         }
 346
 347         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
 348         if (!machine_data) {
 349                 ret = -ENOMEM;
 350                 goto error_alloc;
 351         }
 352
 353         machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 354         machine_data->dai[0].ops = &mpc8610_hpcd_ops;
 355
 356         /* Determine the codec name, it will be used as the codec DAI name */
 357         ret = codec_node_dev_name(codec_np, machine_data->codec_name,
 358                                   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         machine_data->dai[0].codec_name = machine_data->codec_name;
 366
 367         /* The DAI name from the codec (snd_soc_dai_driver.name) */
 368         machine_data->dai[0].codec_dai_name = "cs4270-hifi";
 369
 370         /* We register two DAIs per SSI, one for playback and the other for
 371          * capture.  Currently, we only support codecs that have one DAI for
 372          * both playback and capture.
 373          */
 374         memcpy(&machine_data->dai[1], &machine_data->dai[0],
 375                sizeof(struct snd_soc_dai_link));
 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         machine_data->ssi_id = be32_to_cpup(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                 machine_data->dai_format = SND_SOC_DAIFMT_I2S;
 396                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 397                 machine_data->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                 machine_data->clk_frequency = be32_to_cpup(iprop);
 411         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 412                 machine_data->dai_format = SND_SOC_DAIFMT_I2S;
 413                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 414                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 415         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 416                 machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
 417                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 418                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 419         } else if (strcasecmp(sprop, "lj-master") == 0) {
 420                 machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
 421                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 422                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 423         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 424                 machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
 425                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 426                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 427         } else if (strcasecmp(sprop, "rj-master") == 0) {
 428                 machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
 429                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 430                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 431         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 432                 machine_data->dai_format = SND_SOC_DAIFMT_AC97;
 433                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 434                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 435         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 436                 machine_data->dai_format = SND_SOC_DAIFMT_AC97;
 437                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 438                 machine_data->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 (!machine_data->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         machine_data->dai[0].platform_name = machine_data->platform_name[0];
 454         ret = get_dma_channel(np, "fsl,playback-dma", &machine_data->dai[0],
 455                               &machine_data->dma_channel_id[0],
 456                               &machine_data->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         machine_data->dai[1].platform_name = machine_data->platform_name[1];
 464         ret = get_dma_channel(np, "fsl,capture-dma", &machine_data->dai[1],
 465                               &machine_data->dma_channel_id[1],
 466                               &machine_data->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         machine_data->dai[0].stream_name = "playback";
 474         machine_data->dai[1].stream_name = "capture";
 475         machine_data->dai[0].name = machine_data->dai[0].stream_name;
 476         machine_data->dai[1].name = machine_data->dai[1].stream_name;
 477
 478         machine_data->card.probe = mpc8610_hpcd_machine_probe;
 479         machine_data->card.remove = mpc8610_hpcd_machine_remove;
 480         machine_data->card.name = pdev->name; /* The platform driver name */
 481         machine_data->card.num_links = 2;
 482         machine_data->card.dai_link = machine_data->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, &machine_data->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_sound;
 500         }
 501         dev_set_drvdata(&pdev->dev, sound_device);
 502
 503         of_node_put(codec_np);
 504
 505         return 0;
 506
 507 error_sound:
 508         platform_device_unregister(sound_device);
 509 error:
 510         kfree(machine_data);
 511 error_alloc:
 512         of_node_put(codec_np);
 513         return ret;
 514 }
 515
 516 /**
 517  * mpc8610_hpcd_remove: remove the platform device
 518  *
 519  * This function is called when the platform device is removed.
 520  */
 521 static int __devexit mpc8610_hpcd_remove(struct platform_device *pdev)
 522 {
 523         struct platform_device *sound_device = dev_get_drvdata(&pdev->dev);
 524         struct snd_soc_card *card = platform_get_drvdata(sound_device);
 525         struct mpc8610_hpcd_data *machine_data =
 526                 container_of(card, struct mpc8610_hpcd_data, card);
 527
 528         platform_device_unregister(sound_device);
 529
 530         kfree(machine_data);
 531         sound_device->dev.platform_data = NULL;
 532
 533         dev_set_drvdata(&pdev->dev, NULL);
 534
 535         return 0;
 536 }
 537
 538 static struct platform_driver mpc8610_hpcd_driver = {
 539         .probe = mpc8610_hpcd_probe,
 540         .remove = __devexit_p(mpc8610_hpcd_remove),
 541         .driver = {
 542                 /* The name must match the 'model' property in the device tree,
 543                  * in lowercase letters.
 544                  */
 545                 .name = "snd-soc-mpc8610hpcd",
 546                 .owner = THIS_MODULE,
 547         },
 548 };
 549
 550 /**
 551  * mpc8610_hpcd_init: machine driver initialization.
 552  *
 553  * This function is called when this module is loaded.
 554  */
 555 static int __init mpc8610_hpcd_init(void)
 556 {
 557         struct device_node *guts_np;
 558         struct resource res;
 559
 560         pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
 561
 562         /* Get the physical address of the global utilities registers */
 563         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
 564         if (of_address_to_resource(guts_np, 0, &res)) {
 565                 pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
 566                 return -EINVAL;
 567         }
 568         guts_phys = res.start;
 569
 570         return platform_driver_register(&mpc8610_hpcd_driver);
 571 }
 572
 573 /**
 574  * mpc8610_hpcd_exit: machine driver exit
 575  *
 576  * This function is called when this driver is unloaded.
 577  */
 578 static void __exit mpc8610_hpcd_exit(void)
 579 {
 580         platform_driver_unregister(&mpc8610_hpcd_driver);
 581 }
 582
 583 module_init(mpc8610_hpcd_init);
 584 module_exit(mpc8610_hpcd_exit);
 585
 586 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 587 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
 588 MODULE_LICENSE("GPL v2");