sound/soc/fsl/p1022_rdk.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Freescale P1022RDK ALSA SoC Machine driver
   4 //
   5 // Author: Timur Tabi <timur@freescale.com>
   6 //
   7 // Copyright 2012 Freescale Semiconductor, Inc.
   8 //
   9 // Note: in order for audio to work correctly, the output controls need
  10 // to be enabled, because they control the clock.  So for playback, for
  11 // example:
  12 //
  13 //      amixer sset 'Left Output Mixer PCM' on
  14 //      amixer sset 'Right Output Mixer PCM' on
  15
  16 #include <linux/module.h>
  17 #include <linux/fsl/guts.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_device.h>
  21 #include <linux/slab.h>
  22 #include <sound/soc.h>
  23
  24 #include "fsl_dma.h"
  25 #include "fsl_ssi.h"
  26 #include "fsl_utils.h"
  27
  28 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  29
  30 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  31 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  32 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  33
  34 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  35 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  36
  37 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  38 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  39
  40 /*
  41  * Set the DMACR register in the GUTS
  42  *
  43  * The DMACR register determines the source of initiated transfers for each
  44  * channel on each DMA controller.  Rather than have a bunch of repetitive
  45  * macros for the bit patterns, we just have a function that calculates
  46  * them.
  47  *
  48  * guts: Pointer to GUTS structure
  49  * co: The DMA controller (0 or 1)
  50  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  51  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  52  */
  53 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
  54         unsigned int co, unsigned int ch, unsigned int device)
  55 {
  56         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  57
  58         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  59 }
  60
  61 /* There's only one global utilities register */
  62 static phys_addr_t guts_phys;
  63
  64 /**
  65  * machine_data: machine-specific ASoC device data
  66  *
  67  * This structure contains data for a single sound platform device on an
  68  * P1022 RDK.  Some of the data is taken from the device tree.
  69  */
  70 struct machine_data {
  71         struct snd_soc_dai_link dai[2];
  72         struct snd_soc_card card;
  73         unsigned int dai_format;
  74         unsigned int codec_clk_direction;
  75         unsigned int cpu_clk_direction;
  76         unsigned int clk_frequency;
  77         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  78         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  79         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  80 };
  81
  82 /**
  83  * p1022_rdk_machine_probe: initialize the board
  84  *
  85  * This function is used to initialize the board-specific hardware.
  86  *
  87  * Here we program the DMACR and PMUXCR registers.
  88  */
  89 static int p1022_rdk_machine_probe(struct snd_soc_card *card)
  90 {
  91         struct machine_data *mdata =
  92                 container_of(card, struct machine_data, card);
  93         struct ccsr_guts __iomem *guts;
  94
  95         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
  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_rdk_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_rdk_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(asoc_rtd_to_codec(rtd, 0), mdata->dai_format);
 138         if (ret < 0) {
 139                 dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
 140                         ret);
 141                 return ret;
 142         }
 143
 144         ret = snd_soc_dai_set_pll(asoc_rtd_to_codec(rtd, 0), 0, 0, mdata->clk_frequency,
 145                 mdata->clk_frequency);
 146         if (ret < 0) {
 147                 dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
 148                         ret);
 149                 return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 /**
 156  * p1022_rdk_machine_remove: Remove the sound device
 157  *
 158  * This function is called to remove the sound device for one SSI.  We
 159  * de-program the DMACR and PMUXCR register.
 160  */
 161 static int p1022_rdk_machine_remove(struct snd_soc_card *card)
 162 {
 163         struct machine_data *mdata =
 164                 container_of(card, struct machine_data, card);
 165         struct ccsr_guts __iomem *guts;
 166
 167         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 168         if (!guts) {
 169                 dev_err(card->dev, "could not map global utilities\n");
 170                 return -ENOMEM;
 171         }
 172
 173         /* Restore the signal routing */
 174         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 175         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 176         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 177         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
 178
 179         iounmap(guts);
 180
 181         return 0;
 182 }
 183
 184 /**
 185  * p1022_rdk_ops: ASoC machine driver operations
 186  */
 187 static const struct snd_soc_ops p1022_rdk_ops = {
 188         .startup = p1022_rdk_startup,
 189 };
 190
 191 /**
 192  * p1022_rdk_probe: platform probe function for the machine driver
 193  *
 194  * Although this is a machine driver, the SSI node is the "master" node with
 195  * respect to audio hardware connections.  Therefore, we create a new ASoC
 196  * device for each new SSI node that has a codec attached.
 197  */
 198 static int p1022_rdk_probe(struct platform_device *pdev)
 199 {
 200         struct device *dev = pdev->dev.parent;
 201         /* ssi_pdev is the platform device for the SSI node that probed us */
 202         struct platform_device *ssi_pdev = to_platform_device(dev);
 203         struct device_node *np = ssi_pdev->dev.of_node;
 204         struct device_node *codec_np = NULL;
 205         struct machine_data *mdata;
 206         struct snd_soc_dai_link_component *comp;
 207         const u32 *iprop;
 208         int ret;
 209
 210         /* Find the codec node for this SSI. */
 211         codec_np = of_parse_phandle(np, "codec-handle", 0);
 212         if (!codec_np) {
 213                 dev_err(dev, "could not find codec node\n");
 214                 return -EINVAL;
 215         }
 216
 217         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
 218         if (!mdata) {
 219                 ret = -ENOMEM;
 220                 goto error_put;
 221         }
 222
 223         comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
 224         if (!comp) {
 225                 ret = -ENOMEM;
 226                 goto error_put;
 227         }
 228
 229         mdata->dai[0].cpus      = &comp[0];
 230         mdata->dai[0].codecs    = &comp[1];
 231         mdata->dai[0].platforms = &comp[2];
 232
 233         mdata->dai[0].num_cpus          = 1;
 234         mdata->dai[0].num_codecs        = 1;
 235         mdata->dai[0].num_platforms     = 1;
 236
 237         mdata->dai[1].cpus      = &comp[3];
 238         mdata->dai[1].codecs    = &comp[4];
 239         mdata->dai[1].platforms = &comp[5];
 240
 241         mdata->dai[1].num_cpus          = 1;
 242         mdata->dai[1].num_codecs        = 1;
 243         mdata->dai[1].num_platforms     = 1;
 244
 245         mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
 246         mdata->dai[0].ops = &p1022_rdk_ops;
 247
 248         /* ASoC core can match codec with device node */
 249         mdata->dai[0].codecs->of_node = codec_np;
 250
 251         /*
 252          * We register two DAIs per SSI, one for playback and the other for
 253          * capture.  We support codecs that have separate DAIs for both playback
 254          * and capture.
 255          */
 256         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 257
 258         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 259         mdata->dai[0].codecs->dai_name = "wm8960-hifi";
 260         mdata->dai[1].codecs->dai_name = mdata->dai[0].codecs->dai_name;
 261
 262         /*
 263          * Configure the SSI for I2S slave mode.  Older device trees have
 264          * an fsl,mode property, but we ignore that since there's really
 265          * only one way to configure the SSI.
 266          */
 267         mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 268                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 269         mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 270         mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 271
 272         /*
 273          * In i2s-slave mode, the codec has its own clock source, so we
 274          * need to get the frequency from the device tree and pass it to
 275          * the codec driver.
 276          */
 277         iprop = of_get_property(codec_np, "clock-frequency", NULL);
 278         if (!iprop || !*iprop) {
 279                 dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
 280                 ret = -EINVAL;
 281                 goto error;
 282         }
 283         mdata->clk_frequency = be32_to_cpup(iprop);
 284
 285         if (!mdata->clk_frequency) {
 286                 dev_err(&pdev->dev, "unknown clock frequency\n");
 287                 ret = -EINVAL;
 288                 goto error;
 289         }
 290
 291         /* Find the playback DMA channel to use. */
 292         mdata->dai[0].platforms->name = mdata->platform_name[0];
 293         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 294                                        &mdata->dma_channel_id[0],
 295                                        &mdata->dma_id[0]);
 296         if (ret) {
 297                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
 298                         ret);
 299                 goto error;
 300         }
 301
 302         /* Find the capture DMA channel to use. */
 303         mdata->dai[1].platforms->name = mdata->platform_name[1];
 304         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 305                                        &mdata->dma_channel_id[1],
 306                                        &mdata->dma_id[1]);
 307         if (ret) {
 308                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
 309                         ret);
 310                 goto error;
 311         }
 312
 313         /* Initialize our DAI data structure.  */
 314         mdata->dai[0].stream_name = "playback";
 315         mdata->dai[1].stream_name = "capture";
 316         mdata->dai[0].name = mdata->dai[0].stream_name;
 317         mdata->dai[1].name = mdata->dai[1].stream_name;
 318
 319         mdata->card.probe = p1022_rdk_machine_probe;
 320         mdata->card.remove = p1022_rdk_machine_remove;
 321         mdata->card.name = pdev->name; /* The platform driver name */
 322         mdata->card.owner = THIS_MODULE;
 323         mdata->card.dev = &pdev->dev;
 324         mdata->card.num_links = 2;
 325         mdata->card.dai_link = mdata->dai;
 326
 327         /* Register with ASoC */
 328         ret = snd_soc_register_card(&mdata->card);
 329         if (ret) {
 330                 dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
 331                 goto error;
 332         }
 333
 334         return 0;
 335
 336 error:
 337         kfree(mdata);
 338 error_put:
 339         of_node_put(codec_np);
 340         return ret;
 341 }
 342
 343 /**
 344  * p1022_rdk_remove: remove the platform device
 345  *
 346  * This function is called when the platform device is removed.
 347  */
 348 static int p1022_rdk_remove(struct platform_device *pdev)
 349 {
 350         struct snd_soc_card *card = platform_get_drvdata(pdev);
 351         struct machine_data *mdata =
 352                 container_of(card, struct machine_data, card);
 353
 354         snd_soc_unregister_card(card);
 355         kfree(mdata);
 356
 357         return 0;
 358 }
 359
 360 static struct platform_driver p1022_rdk_driver = {
 361         .probe = p1022_rdk_probe,
 362         .remove = p1022_rdk_remove,
 363         .driver = {
 364                 /*
 365                  * The name must match 'compatible' property in the device tree,
 366                  * in lowercase letters.
 367                  */
 368                 .name = "snd-soc-p1022rdk",
 369         },
 370 };
 371
 372 /**
 373  * p1022_rdk_init: machine driver initialization.
 374  *
 375  * This function is called when this module is loaded.
 376  */
 377 static int __init p1022_rdk_init(void)
 378 {
 379         struct device_node *guts_np;
 380         struct resource res;
 381
 382         /* Get the physical address of the global utilities registers */
 383         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 384         if (of_address_to_resource(guts_np, 0, &res)) {
 385                 pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
 386                 of_node_put(guts_np);
 387                 return -EINVAL;
 388         }
 389         guts_phys = res.start;
 390         of_node_put(guts_np);
 391
 392         return platform_driver_register(&p1022_rdk_driver);
 393 }
 394
 395 /**
 396  * p1022_rdk_exit: machine driver exit
 397  *
 398  * This function is called when this driver is unloaded.
 399  */
 400 static void __exit p1022_rdk_exit(void)
 401 {
 402         platform_driver_unregister(&p1022_rdk_driver);
 403 }
 404
 405 late_initcall(p1022_rdk_init);
 406 module_exit(p1022_rdk_exit);
 407
 408 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 409 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
 410 MODULE_LICENSE("GPL v2");