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 = substream->private_data;
 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(rtd->codec_dai, 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(rtd->codec_dai, 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         int ret = -ENODEV;
 193         const char *sprop;
 194         const u32 *iprop;
 195
 196         /* Find the codec node for this SSI. */
 197         codec_np = of_parse_phandle(np, "codec-handle", 0);
 198         if (!codec_np) {
 199                 dev_err(dev, "invalid codec node\n");
 200                 return -EINVAL;
 201         }
 202
 203         machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
 204         if (!machine_data) {
 205                 ret = -ENOMEM;
 206                 goto error_alloc;
 207         }
 208
 209         machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 210         machine_data->dai[0].ops = &mpc8610_hpcd_ops;
 211
 212         /* ASoC core can match codec with device node */
 213         machine_data->dai[0].codec_of_node = codec_np;
 214
 215         /* The DAI name from the codec (snd_soc_dai_driver.name) */
 216         machine_data->dai[0].codec_dai_name = "cs4270-hifi";
 217
 218         /* We register two DAIs per SSI, one for playback and the other for
 219          * capture.  Currently, we only support codecs that have one DAI for
 220          * both playback and capture.
 221          */
 222         memcpy(&machine_data->dai[1], &machine_data->dai[0],
 223                sizeof(struct snd_soc_dai_link));
 224
 225         /* Get the device ID */
 226         iprop = of_get_property(np, "cell-index", NULL);
 227         if (!iprop) {
 228                 dev_err(&pdev->dev, "cell-index property not found\n");
 229                 ret = -EINVAL;
 230                 goto error;
 231         }
 232         machine_data->ssi_id = be32_to_cpup(iprop);
 233
 234         /* Get the serial format and clock direction. */
 235         sprop = of_get_property(np, "fsl,mode", NULL);
 236         if (!sprop) {
 237                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 238                 ret = -EINVAL;
 239                 goto error;
 240         }
 241
 242         if (strcasecmp(sprop, "i2s-slave") == 0) {
 243                 machine_data->dai_format =
 244                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 245                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 246                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 247
 248                 /* In i2s-slave mode, the codec has its own clock source, so we
 249                  * need to get the frequency from the device tree and pass it to
 250                  * the codec driver.
 251                  */
 252                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 253                 if (!iprop || !*iprop) {
 254                         dev_err(&pdev->dev, "codec bus-frequency "
 255                                 "property is missing or invalid\n");
 256                         ret = -EINVAL;
 257                         goto error;
 258                 }
 259                 machine_data->clk_frequency = be32_to_cpup(iprop);
 260         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 261                 machine_data->dai_format =
 262                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 263                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 264                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 265         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 266                 machine_data->dai_format =
 267                         SND_SOC_DAIFMT_LEFT_J | 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         } else if (strcasecmp(sprop, "lj-master") == 0) {
 271                 machine_data->dai_format =
 272                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 273                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 274                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 275         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 276                 machine_data->dai_format =
 277                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 278                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 279                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 280         } else if (strcasecmp(sprop, "rj-master") == 0) {
 281                 machine_data->dai_format =
 282                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 283                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 284                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 285         } else if (strcasecmp(sprop, "ac97-slave") == 0) {
 286                 machine_data->dai_format =
 287                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 288                 machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 289                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 290         } else if (strcasecmp(sprop, "ac97-master") == 0) {
 291                 machine_data->dai_format =
 292                         SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 293                 machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 294                 machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 295         } else {
 296                 dev_err(&pdev->dev,
 297                         "unrecognized fsl,mode property '%s'\n", sprop);
 298                 ret = -EINVAL;
 299                 goto error;
 300         }
 301
 302         if (!machine_data->clk_frequency) {
 303                 dev_err(&pdev->dev, "unknown clock frequency\n");
 304                 ret = -EINVAL;
 305                 goto error;
 306         }
 307
 308         /* Find the playback DMA channel to use. */
 309         machine_data->dai[0].platform_name = machine_data->platform_name[0];
 310         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
 311                                        &machine_data->dai[0],
 312                                        &machine_data->dma_channel_id[0],
 313                                        &machine_data->dma_id[0]);
 314         if (ret) {
 315                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 316                 goto error;
 317         }
 318
 319         /* Find the capture DMA channel to use. */
 320         machine_data->dai[1].platform_name = machine_data->platform_name[1];
 321         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
 322                                        &machine_data->dai[1],
 323                                        &machine_data->dma_channel_id[1],
 324                                        &machine_data->dma_id[1]);
 325         if (ret) {
 326                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 327                 goto error;
 328         }
 329
 330         /* Initialize our DAI data structure.  */
 331         machine_data->dai[0].stream_name = "playback";
 332         machine_data->dai[1].stream_name = "capture";
 333         machine_data->dai[0].name = machine_data->dai[0].stream_name;
 334         machine_data->dai[1].name = machine_data->dai[1].stream_name;
 335
 336         machine_data->card.probe = mpc8610_hpcd_machine_probe;
 337         machine_data->card.remove = mpc8610_hpcd_machine_remove;
 338         machine_data->card.name = pdev->name; /* The platform driver name */
 339         machine_data->card.owner = THIS_MODULE;
 340         machine_data->card.dev = &pdev->dev;
 341         machine_data->card.num_links = 2;
 342         machine_data->card.dai_link = machine_data->dai;
 343
 344         /* Register with ASoC */
 345         ret = snd_soc_register_card(&machine_data->card);
 346         if (ret) {
 347                 dev_err(&pdev->dev, "could not register card\n");
 348                 goto error;
 349         }
 350
 351         of_node_put(codec_np);
 352
 353         return 0;
 354
 355 error:
 356         kfree(machine_data);
 357 error_alloc:
 358         of_node_put(codec_np);
 359         return ret;
 360 }
 361
 362 /**
 363  * mpc8610_hpcd_remove: remove the platform device
 364  *
 365  * This function is called when the platform device is removed.
 366  */
 367 static int mpc8610_hpcd_remove(struct platform_device *pdev)
 368 {
 369         struct snd_soc_card *card = platform_get_drvdata(pdev);
 370         struct mpc8610_hpcd_data *machine_data =
 371                 container_of(card, struct mpc8610_hpcd_data, card);
 372
 373         snd_soc_unregister_card(card);
 374         kfree(machine_data);
 375
 376         return 0;
 377 }
 378
 379 static struct platform_driver mpc8610_hpcd_driver = {
 380         .probe = mpc8610_hpcd_probe,
 381         .remove = mpc8610_hpcd_remove,
 382         .driver = {
 383                 /* The name must match 'compatible' property in the device tree,
 384                  * in lowercase letters.
 385                  */
 386                 .name = "snd-soc-mpc8610hpcd",
 387         },
 388 };
 389
 390 /**
 391  * mpc8610_hpcd_init: machine driver initialization.
 392  *
 393  * This function is called when this module is loaded.
 394  */
 395 static int __init mpc8610_hpcd_init(void)
 396 {
 397         struct device_node *guts_np;
 398         struct resource res;
 399
 400         pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");
 401
 402         /* Get the physical address of the global utilities registers */
 403         guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
 404         if (of_address_to_resource(guts_np, 0, &res)) {
 405                 pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
 406                 return -EINVAL;
 407         }
 408         guts_phys = res.start;
 409
 410         return platform_driver_register(&mpc8610_hpcd_driver);
 411 }
 412
 413 /**
 414  * mpc8610_hpcd_exit: machine driver exit
 415  *
 416  * This function is called when this driver is unloaded.
 417  */
 418 static void __exit mpc8610_hpcd_exit(void)
 419 {
 420         platform_driver_unregister(&mpc8610_hpcd_driver);
 421 }
 422
 423 module_init(mpc8610_hpcd_init);
 424 module_exit(mpc8610_hpcd_exit);
 425
 426 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 427 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
 428 MODULE_LICENSE("GPL v2");