sound/soc/fsl/p1022_ds.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Freescale P1022DS ALSA SoC Machine driver
   4 //
   5 // Author: Timur Tabi <timur@freescale.com>
   6 //
   7 // Copyright 2010 Freescale Semiconductor, Inc.
   8
   9 #include <linux/module.h>
  10 #include <linux/fsl/guts.h>
  11 #include <linux/interrupt.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 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  22
  23 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  24 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  25 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  26
  27 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  28 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  29
  30 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  31 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  32
  33 /*
  34  * Set the DMACR register in the GUTS
  35  *
  36  * The DMACR register determines the source of initiated transfers for each
  37  * channel on each DMA controller.  Rather than have a bunch of repetitive
  38  * macros for the bit patterns, we just have a function that calculates
  39  * them.
  40  *
  41  * guts: Pointer to GUTS structure
  42  * co: The DMA controller (0 or 1)
  43  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  44  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  45  */
  46 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
  47         unsigned int co, unsigned int ch, unsigned int device)
  48 {
  49         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  50
  51         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  52 }
  53
  54 /* There's only one global utilities register */
  55 static phys_addr_t guts_phys;
  56
  57 /**
  58  * machine_data: machine-specific ASoC device data
  59  *
  60  * This structure contains data for a single sound platform device on an
  61  * P1022 DS.  Some of the data is taken from the device tree.
  62  */
  63 struct machine_data {
  64         struct snd_soc_dai_link dai[2];
  65         struct snd_soc_card card;
  66         unsigned int dai_format;
  67         unsigned int codec_clk_direction;
  68         unsigned int cpu_clk_direction;
  69         unsigned int clk_frequency;
  70         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  71         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  72         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  73         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  74 };
  75
  76 /**
  77  * p1022_ds_machine_probe: initialize the board
  78  *
  79  * This function is used to initialize the board-specific hardware.
  80  *
  81  * Here we program the DMACR and PMUXCR registers.
  82  */
  83 static int p1022_ds_machine_probe(struct snd_soc_card *card)
  84 {
  85         struct machine_data *mdata =
  86                 container_of(card, struct machine_data, card);
  87         struct ccsr_guts __iomem *guts;
  88
  89         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
  90         if (!guts) {
  91                 dev_err(card->dev, "could not map global utilities\n");
  92                 return -ENOMEM;
  93         }
  94
  95         /* Enable SSI Tx signal */
  96         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
  97                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
  98
  99         /* Enable SSI Rx signal */
 100         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 101                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
 102
 103         /* Enable DMA Channel for SSI */
 104         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 105                         CCSR_GUTS_DMUXCR_SSI);
 106
 107         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 108                         CCSR_GUTS_DMUXCR_SSI);
 109
 110         iounmap(guts);
 111
 112         return 0;
 113 }
 114
 115 /**
 116  * p1022_ds_startup: program the board with various hardware parameters
 117  *
 118  * This function takes board-specific information, like clock frequencies
 119  * and serial data formats, and passes that information to the codec and
 120  * transport drivers.
 121  */
 122 static int p1022_ds_startup(struct snd_pcm_substream *substream)
 123 {
 124         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 125         struct machine_data *mdata =
 126                 container_of(rtd->card, struct machine_data, card);
 127         struct device *dev = rtd->card->dev;
 128         int ret = 0;
 129
 130         /* Tell the codec driver what the serial protocol is. */
 131         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
 132         if (ret < 0) {
 133                 dev_err(dev, "could not set codec driver audio format\n");
 134                 return ret;
 135         }
 136
 137         /*
 138          * Tell the codec driver what the MCLK frequency is, and whether it's
 139          * a slave or master.
 140          */
 141         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
 142                                      mdata->codec_clk_direction);
 143         if (ret < 0) {
 144                 dev_err(dev, "could not set codec driver clock params\n");
 145                 return ret;
 146         }
 147
 148         return 0;
 149 }
 150
 151 /**
 152  * p1022_ds_machine_remove: Remove the sound device
 153  *
 154  * This function is called to remove the sound device for one SSI.  We
 155  * de-program the DMACR and PMUXCR register.
 156  */
 157 static int p1022_ds_machine_remove(struct snd_soc_card *card)
 158 {
 159         struct machine_data *mdata =
 160                 container_of(card, struct machine_data, card);
 161         struct ccsr_guts __iomem *guts;
 162
 163         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 164         if (!guts) {
 165                 dev_err(card->dev, "could not map global utilities\n");
 166                 return -ENOMEM;
 167         }
 168
 169         /* Restore the signal routing */
 170         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 171         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 172         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 173         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
 174
 175         iounmap(guts);
 176
 177         return 0;
 178 }
 179
 180 /**
 181  * p1022_ds_ops: ASoC machine driver operations
 182  */
 183 static const struct snd_soc_ops p1022_ds_ops = {
 184         .startup = p1022_ds_startup,
 185 };
 186
 187 /**
 188  * p1022_ds_probe: platform probe function for the machine driver
 189  *
 190  * Although this is a machine driver, the SSI node is the "master" node with
 191  * respect to audio hardware connections.  Therefore, we create a new ASoC
 192  * device for each new SSI node that has a codec attached.
 193  */
 194 static int p1022_ds_probe(struct platform_device *pdev)
 195 {
 196         struct device *dev = pdev->dev.parent;
 197         /* ssi_pdev is the platform device for the SSI node that probed us */
 198         struct platform_device *ssi_pdev = to_platform_device(dev);
 199         struct device_node *np = ssi_pdev->dev.of_node;
 200         struct device_node *codec_np = NULL;
 201         struct machine_data *mdata;
 202         struct snd_soc_dai_link_component *comp;
 203         int ret = -ENODEV;
 204         const char *sprop;
 205         const u32 *iprop;
 206
 207         /* Find the codec node for this SSI. */
 208         codec_np = of_parse_phandle(np, "codec-handle", 0);
 209         if (!codec_np) {
 210                 dev_err(dev, "could not find codec node\n");
 211                 return -EINVAL;
 212         }
 213
 214         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
 215         if (!mdata) {
 216                 ret = -ENOMEM;
 217                 goto error_put;
 218         }
 219
 220         comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
 221         if (!comp) {
 222                 ret = -ENOMEM;
 223                 goto error_put;
 224         }
 225
 226         mdata->dai[0].cpus      = &comp[0];
 227         mdata->dai[0].codecs    = &comp[1];
 228         mdata->dai[0].platforms = &comp[2];
 229
 230         mdata->dai[0].num_cpus          = 1;
 231         mdata->dai[0].num_codecs        = 1;
 232         mdata->dai[0].num_platforms     = 1;
 233
 234         mdata->dai[1].cpus      = &comp[3];
 235         mdata->dai[1].codecs    = &comp[4];
 236         mdata->dai[1].platforms = &comp[5];
 237
 238         mdata->dai[1].num_cpus          = 1;
 239         mdata->dai[1].num_codecs        = 1;
 240         mdata->dai[1].num_platforms     = 1;
 241
 242
 243         mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
 244         mdata->dai[0].ops = &p1022_ds_ops;
 245
 246         /* ASoC core can match codec with device node */
 247         mdata->dai[0].codecs->of_node = codec_np;
 248
 249         /* We register two DAIs per SSI, one for playback and the other for
 250          * capture.  We support codecs that have separate DAIs for both playback
 251          * and capture.
 252          */
 253         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 254
 255         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 256         mdata->dai[0].codecs->dai_name = "wm8776-hifi-playback";
 257         mdata->dai[1].codecs->dai_name = "wm8776-hifi-capture";
 258
 259         /* Get the device ID */
 260         iprop = of_get_property(np, "cell-index", NULL);
 261         if (!iprop) {
 262                 dev_err(&pdev->dev, "cell-index property not found\n");
 263                 ret = -EINVAL;
 264                 goto error;
 265         }
 266         mdata->ssi_id = be32_to_cpup(iprop);
 267
 268         /* Get the serial format and clock direction. */
 269         sprop = of_get_property(np, "fsl,mode", NULL);
 270         if (!sprop) {
 271                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 272                 ret = -EINVAL;
 273                 goto error;
 274         }
 275
 276         if (strcasecmp(sprop, "i2s-slave") == 0) {
 277                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 278                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 279                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 280                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 281
 282                 /* In i2s-slave mode, the codec has its own clock source, so we
 283                  * need to get the frequency from the device tree and pass it to
 284                  * the codec driver.
 285                  */
 286                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 287                 if (!iprop || !*iprop) {
 288                         dev_err(&pdev->dev, "codec bus-frequency "
 289                                 "property is missing or invalid\n");
 290                         ret = -EINVAL;
 291                         goto error;
 292                 }
 293                 mdata->clk_frequency = be32_to_cpup(iprop);
 294         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 295                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 296                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 297                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 298                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 299         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 300                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 301                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 302                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 303                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 304         } else if (strcasecmp(sprop, "lj-master") == 0) {
 305                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 306                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 307                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 308                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 309         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 310                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 311                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 312                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 313                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 314         } else if (strcasecmp(sprop, "rj-master") == 0) {
 315                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 316                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 317                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 318                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 319         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 320                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 321                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 322                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 323                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 324         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 325                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 326                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 327                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 328                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 329         } else {
 330                 dev_err(&pdev->dev,
 331                         "unrecognized fsl,mode property '%s'\n", sprop);
 332                 ret = -EINVAL;
 333                 goto error;
 334         }
 335
 336         if (!mdata->clk_frequency) {
 337                 dev_err(&pdev->dev, "unknown clock frequency\n");
 338                 ret = -EINVAL;
 339                 goto error;
 340         }
 341
 342         /* Find the playback DMA channel to use. */
 343         mdata->dai[0].platforms->name = mdata->platform_name[0];
 344         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 345                                        &mdata->dma_channel_id[0],
 346                                        &mdata->dma_id[0]);
 347         if (ret) {
 348                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 349                 goto error;
 350         }
 351
 352         /* Find the capture DMA channel to use. */
 353         mdata->dai[1].platforms->name = mdata->platform_name[1];
 354         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 355                                        &mdata->dma_channel_id[1],
 356                                        &mdata->dma_id[1]);
 357         if (ret) {
 358                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 359                 goto error;
 360         }
 361
 362         /* Initialize our DAI data structure.  */
 363         mdata->dai[0].stream_name = "playback";
 364         mdata->dai[1].stream_name = "capture";
 365         mdata->dai[0].name = mdata->dai[0].stream_name;
 366         mdata->dai[1].name = mdata->dai[1].stream_name;
 367
 368         mdata->card.probe = p1022_ds_machine_probe;
 369         mdata->card.remove = p1022_ds_machine_remove;
 370         mdata->card.name = pdev->name; /* The platform driver name */
 371         mdata->card.owner = THIS_MODULE;
 372         mdata->card.dev = &pdev->dev;
 373         mdata->card.num_links = 2;
 374         mdata->card.dai_link = mdata->dai;
 375
 376         /* Register with ASoC */
 377         ret = snd_soc_register_card(&mdata->card);
 378         if (ret) {
 379                 dev_err(&pdev->dev, "could not register card\n");
 380                 goto error;
 381         }
 382
 383         of_node_put(codec_np);
 384
 385         return 0;
 386
 387 error:
 388         kfree(mdata);
 389 error_put:
 390         of_node_put(codec_np);
 391         return ret;
 392 }
 393
 394 /**
 395  * p1022_ds_remove: remove the platform device
 396  *
 397  * This function is called when the platform device is removed.
 398  */
 399 static int p1022_ds_remove(struct platform_device *pdev)
 400 {
 401         struct snd_soc_card *card = platform_get_drvdata(pdev);
 402         struct machine_data *mdata =
 403                 container_of(card, struct machine_data, card);
 404
 405         snd_soc_unregister_card(card);
 406         kfree(mdata);
 407
 408         return 0;
 409 }
 410
 411 static struct platform_driver p1022_ds_driver = {
 412         .probe = p1022_ds_probe,
 413         .remove = p1022_ds_remove,
 414         .driver = {
 415                 /*
 416                  * The name must match 'compatible' property in the device tree,
 417                  * in lowercase letters.
 418                  */
 419                 .name = "snd-soc-p1022ds",
 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");