sound/soc/fsl/mpc8610_hpcd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Freescale MPC8610HPCD ALSA SoC Machine driver
   4 //
   5 // Author: Timur Tabi <timur@freescale.com>
   6 //
   7 // Copyright 2007-2010 Freescale Semiconductor, Inc.
   8
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/fsl/guts.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_device.h>
  14 #include <linux/slab.h>
  15 #include <sound/soc.h>
  16
  17 #include "fsl_dma.h"
  18 #include "fsl_ssi.h"
  19 #include "fsl_utils.h"
  20
  21 /* There's only one global utilities register */
  22 static phys_addr_t guts_phys;
  23
  24 /**
  25  * mpc8610_hpcd_data: machine-specific ASoC device data
  26  *
  27  * This structure contains data for a single sound platform device on an
  28  * MPC8610 HPCD.  Some of the data is taken from the device tree.
  29  */
  30 struct mpc8610_hpcd_data {
  31         struct snd_soc_dai_link dai[2];
  32         struct snd_soc_card card;
  33         unsigned int dai_format;
  34         unsigned int codec_clk_direction;
  35         unsigned int cpu_clk_direction;
  36         unsigned int clk_frequency;
  37         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  38         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  39         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  40         char codec_dai_name[DAI_NAME_SIZE];
  41         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  42 };
  43
  44 /**
  45  * mpc8610_hpcd_machine_probe: initialize the board
  46  *
  47  * This function is used to initialize the board-specific hardware.
  48  *
  49  * Here we program the DMACR and PMUXCR registers.
  50  */
  51 static int mpc8610_hpcd_machine_probe(struct snd_soc_card *card)
  52 {
  53         struct mpc8610_hpcd_data *machine_data =
  54                 container_of(card, struct mpc8610_hpcd_data, card);
  55         struct ccsr_guts __iomem *guts;
  56
  57         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
  58         if (!guts) {
  59                 dev_err(card->dev, "could not map global utilities\n");
  60                 return -ENOMEM;
  61         }
  62
  63         /* Program the signal routing between the SSI and the DMA */
  64         guts_set_dmacr(guts, machine_data->dma_id[0],
  65                        machine_data->dma_channel_id[0],
  66                        CCSR_GUTS_DMACR_DEV_SSI);
  67         guts_set_dmacr(guts, machine_data->dma_id[1],
  68                        machine_data->dma_channel_id[1],
  69                        CCSR_GUTS_DMACR_DEV_SSI);
  70
  71         guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
  72                             machine_data->dma_channel_id[0], 0);
  73         guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
  74                             machine_data->dma_channel_id[1], 0);
  75
  76         switch (machine_data->ssi_id) {
  77         case 0:
  78                 clrsetbits_be32(&guts->pmuxcr,
  79                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
  80                 break;
  81         case 1:
  82                 clrsetbits_be32(&guts->pmuxcr,
  83                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
  84                 break;
  85         }
  86
  87         iounmap(guts);
  88
  89         return 0;
  90 }
  91
  92 /**
  93  * mpc8610_hpcd_startup: program the board with various hardware parameters
  94  *
  95  * This function takes board-specific information, like clock frequencies
  96  * and serial data formats, and passes that information to the codec and
  97  * transport drivers.
  98  */
  99 static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
 100 {
 101         struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 102         struct mpc8610_hpcd_data *machine_data =
 103                 container_of(rtd->card, struct mpc8610_hpcd_data, card);
 104         struct device *dev = rtd->card->dev;
 105         int ret = 0;
 106
 107         /* Tell the codec driver what the serial protocol is. */
 108         ret = snd_soc_dai_set_fmt(asoc_rtd_to_codec(rtd, 0), machine_data->dai_format);
 109         if (ret < 0) {
 110                 dev_err(dev, "could not set codec driver audio format\n");
 111                 return ret;
 112         }
 113
 114         /*
 115          * Tell the codec driver what the MCLK frequency is, and whether it's
 116          * a slave or master.
 117          */
 118         ret = snd_soc_dai_set_sysclk(asoc_rtd_to_codec(rtd, 0), 0,
 119                                      machine_data->clk_frequency,
 120                                      machine_data->codec_clk_direction);
 121         if (ret < 0) {
 122                 dev_err(dev, "could not set codec driver clock params\n");
 123                 return ret;
 124         }
 125
 126         return 0;
 127 }
 128
 129 /**
 130  * mpc8610_hpcd_machine_remove: Remove the sound device
 131  *
 132  * This function is called to remove the sound device for one SSI.  We
 133  * de-program the DMACR and PMUXCR register.
 134  */
 135 static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
 136 {
 137         struct mpc8610_hpcd_data *machine_data =
 138                 container_of(card, struct mpc8610_hpcd_data, card);
 139         struct ccsr_guts __iomem *guts;
 140
 141         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 142         if (!guts) {
 143                 dev_err(card->dev, "could not map global utilities\n");
 144                 return -ENOMEM;
 145         }
 146
 147         /* Restore the signal routing */
 148
 149         guts_set_dmacr(guts, machine_data->dma_id[0],
 150                        machine_data->dma_channel_id[0], 0);
 151         guts_set_dmacr(guts, machine_data->dma_id[1],
 152                        machine_data->dma_channel_id[1], 0);
 153
 154         switch (machine_data->ssi_id) {
 155         case 0:
 156                 clrsetbits_be32(&guts->pmuxcr,
 157                         CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
 158                 break;
 159         case 1:
 160                 clrsetbits_be32(&guts->pmuxcr,
 161                         CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
 162                 break;
 163         }
 164
 165         iounmap(guts);
 166
 167         return 0;
 168 }
 169
 170 /**
 171  * mpc8610_hpcd_ops: ASoC machine driver operations
 172  */
 173 static const struct snd_soc_ops mpc8610_hpcd_ops = {
 174         .startup = mpc8610_hpcd_startup,
 175 };
 176
 177 /**
 178  * mpc8610_hpcd_probe: platform probe function for the machine driver
 179  *
 180  * Although this is a machine driver, the SSI node is the "master" node with
 181  * respect to audio hardware connections.  Therefore, we create a new ASoC
 182  * device for each new SSI node that has a codec attached.
 183  */
 184 static int mpc8610_hpcd_probe(struct platform_device *pdev)
 185 {
 186         struct device *dev = pdev->dev.parent;
 187         /* ssi_pdev is the platform device for the SSI node that probed us */
 188         struct platform_device *ssi_pdev = to_platform_device(dev);
 189         struct device_node *np = ssi_pdev->dev.of_node;
 190         struct device_node *codec_np = NULL;
 191         struct mpc8610_hpcd_data *machine_data;
 192         struct snd_soc_dai_link_component *comp;
 193         int ret = -ENODEV;
 194         const char *sprop;
 195         const u32 *iprop;
 196
 197         /* Find the codec node for this SSI. */
 198         codec_np = of_parse_phandle(np, "codec-handle", 0);
 199         if (!codec_np) {
 200                 dev_err(dev, "invalid codec node\n");
 201                 return -EINVAL;
 202         }
 203
 204         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
 205         if (!machine_data) {
 206                 ret = -ENOMEM;
 207                 goto error_alloc;
 208         }
 209
 210         comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
 211         if (!comp) {
 212                 ret = -ENOMEM;
 213                 goto error_alloc;
 214         }
 215
 216         machine_data->dai[0].cpus       = &comp[0];
 217         machine_data->dai[0].codecs     = &comp[1];
 218         machine_data->dai[0].platforms  = &comp[2];
 219
 220         machine_data->dai[0].num_cpus           = 1;
 221         machine_data->dai[0].num_codecs         = 1;
 222         machine_data->dai[0].num_platforms      = 1;
 223
 224         machine_data->dai[1].cpus       = &comp[3];
 225         machine_data->dai[1].codecs     = &comp[4];
 226         machine_data->dai[1].platforms  = &comp[5];
 227
 228         machine_data->dai[1].num_cpus           = 1;
 229         machine_data->dai[1].num_codecs         = 1;
 230         machine_data->dai[1].num_platforms      = 1;
 231
 232         machine_data->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
 233         machine_data->dai[0].ops = &mpc8610_hpcd_ops;
 234
 235         /* ASoC core can match codec with device node */
 236         machine_data->dai[0].codecs->of_node = codec_np;
 237
 238         /* The DAI name from the codec (snd_soc_dai_driver.name) */
 239         machine_data->dai[0].codecs->dai_name = "cs4270-hifi";
 240
 241         /* We register two DAIs per SSI, one for playback and the other for
 242          * capture.  Currently, we only support codecs that have one DAI for
 243          * both playback and capture.
 244          */
 245         memcpy(&machine_data->dai[1], &machine_data->dai[0],
 246                sizeof(struct snd_soc_dai_link));
 247
 248         /* Get the device ID */
 249         iprop = of_get_property(np, "cell-index", NULL);
 250         if (!iprop) {
 251                 dev_err(&pdev->dev, "cell-index property not found\n");
 252                 ret = -EINVAL;
 253                 goto error;
 254         }
 255         machine_data->ssi_id = be32_to_cpup(iprop);
 256
 257         /* Get the serial format and clock direction. */
 258         sprop = of_get_property(np, "fsl,mode", NULL);
 259         if (!sprop) {
 260                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 261                 ret = -EINVAL;
 262                 goto error;
 263         }
 264
 265         if (strcasecmp(sprop, "i2s-slave") == 0) {
 266                 machine_data->dai_format =
 267                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 268                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 269                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 270
 271                 /* In i2s-slave mode, the codec has its own clock source, so we
 272                  * need to get the frequency from the device tree and pass it to
 273                  * the codec driver.
 274                  */
 275                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 276                 if (!iprop || !*iprop) {
 277                         dev_err(&pdev->dev, "codec bus-frequency "
 278                                 "property is missing or invalid\n");
 279                         ret = -EINVAL;
 280                         goto error;
 281                 }
 282                 machine_data->clk_frequency = be32_to_cpup(iprop);
 283         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 284                 machine_data->dai_format =
 285                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 286                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 287                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 288         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 289                 machine_data->dai_format =
 290                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 291                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 292                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 293         } else if (strcasecmp(sprop, "lj-master") == 0) {
 294                 machine_data->dai_format =
 295                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 296                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 297                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 298         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 299                 machine_data->dai_format =
 300                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 301                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 302                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 303         } else if (strcasecmp(sprop, "rj-master") == 0) {
 304                 machine_data->dai_format =
 305                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 306                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 307                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 308         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 309                 machine_data->dai_format =
 310                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 311                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 312                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 313         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 314                 machine_data->dai_format =
 315                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 316                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 317                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 318         } else {
 319                 dev_err(&pdev->dev,
 320                         "unrecognized fsl,mode property '%s'\n", sprop);
 321                 ret = -EINVAL;
 322                 goto error;
 323         }
 324
 325         if (!machine_data->clk_frequency) {
 326                 dev_err(&pdev->dev, "unknown clock frequency\n");
 327                 ret = -EINVAL;
 328                 goto error;
 329         }
 330
 331         /* Find the playback DMA channel to use. */
 332         machine_data->dai[0].platforms->name = machine_data->platform_name[0];
 333         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
 334                                        &machine_data->dai[0],
 335                                        &machine_data->dma_channel_id[0],
 336                                        &machine_data->dma_id[0]);
 337         if (ret) {
 338                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 339                 goto error;
 340         }
 341
 342         /* Find the capture DMA channel to use. */
 343         machine_data->dai[1].platforms->name = machine_data->platform_name[1];
 344         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
 345                                        &machine_data->dai[1],
 346                                        &machine_data->dma_channel_id[1],
 347                                        &machine_data->dma_id[1]);
 348         if (ret) {
 349                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 350                 goto error;
 351         }
 352
 353         /* Initialize our DAI data structure.  */
 354         machine_data->dai[0].stream_name = "playback";
 355         machine_data->dai[1].stream_name = "capture";
 356         machine_data->dai[0].name = machine_data->dai[0].stream_name;
 357         machine_data->dai[1].name = machine_data->dai[1].stream_name;
 358
 359         machine_data->card.probe = mpc8610_hpcd_machine_probe;
 360         machine_data->card.remove = mpc8610_hpcd_machine_remove;
 361         machine_data->card.name = pdev->name; /* The platform driver name */
 362         machine_data->card.owner = THIS_MODULE;
 363         machine_data->card.dev = &pdev->dev;
 364         machine_data->card.num_links = 2;
 365         machine_data->card.dai_link = machine_data->dai;
 366
 367         /* Register with ASoC */
 368         ret = snd_soc_register_card(&machine_data->card);
 369         if (ret) {
 370                 dev_err(&pdev->dev, "could not register card\n");
 371                 goto error;
 372         }
 373
 374         of_node_put(codec_np);
 375
 376         return 0;
 377
 378 error:
 379         kfree(machine_data);
 380 error_alloc:
 381         of_node_put(codec_np);
 382         return ret;
 383 }
 384
 385 /**
 386  * mpc8610_hpcd_remove: remove the platform device
 387  *
 388  * This function is called when the platform device is removed.
 389  */
 390 static int mpc8610_hpcd_remove(struct platform_device *pdev)
 391 {
 392         struct snd_soc_card *card = platform_get_drvdata(pdev);
 393         struct mpc8610_hpcd_data *machine_data =
 394                 container_of(card, struct mpc8610_hpcd_data, card);
 395
 396         snd_soc_unregister_card(card);
 397         kfree(machine_data);
 398
 399         return 0;
 400 }
 401
 402 static struct platform_driver mpc8610_hpcd_driver = {
 403         .probe = mpc8610_hpcd_probe,
 404         .remove = mpc8610_hpcd_remove,
 405         .driver = {
 406                 /* The name must match 'compatible' property in the device tree,
 407                  * in lowercase letters.
 408                  */
 409                 .name = "snd-soc-mpc8610hpcd",
 410         },
 411 };
 412
 413 /**
 414  * mpc8610_hpcd_init: machine driver initialization.
 415  *
 416  * This function is called when this module is loaded.
 417  */
 418 static int __init mpc8610_hpcd_init(void)
 419 {
 420         struct device_node *guts_np;
 421         struct resource res;
 422
 423         pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
 424
 425         /* Get the physical address of the global utilities registers */
 426         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
 427         if (of_address_to_resource(guts_np, 0, &res)) {
 428                 pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
 429                 of_node_put(guts_np);
 430                 return -EINVAL;
 431         }
 432         guts_phys = res.start;
 433         of_node_put(guts_np);
 434
 435         return platform_driver_register(&mpc8610_hpcd_driver);
 436 }
 437
 438 /**
 439  * mpc8610_hpcd_exit: machine driver exit
 440  *
 441  * This function is called when this driver is unloaded.
 442  */
 443 static void __exit mpc8610_hpcd_exit(void)
 444 {
 445         platform_driver_unregister(&mpc8610_hpcd_driver);
 446 }
 447
 448 module_init(mpc8610_hpcd_init);
 449 module_exit(mpc8610_hpcd_exit);
 450
 451 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 452 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
 453 MODULE_LICENSE("GPL v2");