sound/soc/fsl/p1022_ds.c

   1 /**
   2  * Freescale P1022DS ALSA SoC Machine driver
   3  *
   4  * Author: Timur Tabi <timur@freescale.com>
   5  *
   6  * Copyright 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/fsl/guts.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_device.h>
  18 #include <linux/slab.h>
  19 #include <sound/soc.h>
  20
  21 #include "fsl_dma.h"
  22 #include "fsl_ssi.h"
  23 #include "fsl_utils.h"
  24
  25 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  26
  27 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  28 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  29 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  30
  31 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  32 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  33
  34 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  35 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  36
  37 /*
  38  * Set the DMACR register in the GUTS
  39  *
  40  * The DMACR register determines the source of initiated transfers for each
  41  * channel on each DMA controller.  Rather than have a bunch of repetitive
  42  * macros for the bit patterns, we just have a function that calculates
  43  * them.
  44  *
  45  * guts: Pointer to GUTS structure
  46  * co: The DMA controller (0 or 1)
  47  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  48  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  49  */
  50 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
  51         unsigned int co, unsigned int ch, unsigned int device)
  52 {
  53         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  54
  55         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  56 }
  57
  58 /* There's only one global utilities register */
  59 static phys_addr_t guts_phys;
  60
  61 /**
  62  * machine_data: machine-specific ASoC device data
  63  *
  64  * This structure contains data for a single sound platform device on an
  65  * P1022 DS.  Some of the data is taken from the device tree.
  66  */
  67 struct machine_data {
  68         struct snd_soc_dai_link dai[2];
  69         struct snd_soc_card card;
  70         unsigned int dai_format;
  71         unsigned int codec_clk_direction;
  72         unsigned int cpu_clk_direction;
  73         unsigned int clk_frequency;
  74         unsigned int ssi_id;            /* 0 = SSI1, 1 = SSI2, etc */
  75         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  76         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  77         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  78 };
  79
  80 /**
  81  * p1022_ds_machine_probe: initialize the board
  82  *
  83  * This function is used to initialize the board-specific hardware.
  84  *
  85  * Here we program the DMACR and PMUXCR registers.
  86  */
  87 static int p1022_ds_machine_probe(struct snd_soc_card *card)
  88 {
  89         struct machine_data *mdata =
  90                 container_of(card, struct machine_data, card);
  91         struct ccsr_guts __iomem *guts;
  92
  93         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
  94         if (!guts) {
  95                 dev_err(card->dev, "could not map global utilities\n");
  96                 return -ENOMEM;
  97         }
  98
  99         /* Enable SSI Tx signal */
 100         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
 101                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
 102
 103         /* Enable SSI Rx signal */
 104         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 105                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
 106
 107         /* Enable DMA Channel for SSI */
 108         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 109                         CCSR_GUTS_DMUXCR_SSI);
 110
 111         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 112                         CCSR_GUTS_DMUXCR_SSI);
 113
 114         iounmap(guts);
 115
 116         return 0;
 117 }
 118
 119 /**
 120  * p1022_ds_startup: program the board with various hardware parameters
 121  *
 122  * This function takes board-specific information, like clock frequencies
 123  * and serial data formats, and passes that information to the codec and
 124  * transport drivers.
 125  */
 126 static int p1022_ds_startup(struct snd_pcm_substream *substream)
 127 {
 128         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 129         struct machine_data *mdata =
 130                 container_of(rtd->card, struct machine_data, card);
 131         struct device *dev = rtd->card->dev;
 132         int ret = 0;
 133
 134         /* Tell the codec driver what the serial protocol is. */
 135         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
 136         if (ret < 0) {
 137                 dev_err(dev, "could not set codec driver audio format\n");
 138                 return ret;
 139         }
 140
 141         /*
 142          * Tell the codec driver what the MCLK frequency is, and whether it's
 143          * a slave or master.
 144          */
 145         ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0, mdata->clk_frequency,
 146                                      mdata->codec_clk_direction);
 147         if (ret < 0) {
 148                 dev_err(dev, "could not set codec driver clock params\n");
 149                 return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 /**
 156  * p1022_ds_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_ds_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_ds_ops: ASoC machine driver operations
 186  */
 187 static struct snd_soc_ops p1022_ds_ops = {
 188         .startup = p1022_ds_startup,
 189 };
 190
 191 /**
 192  * p1022_ds_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_ds_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         int ret = -ENODEV;
 207         const char *sprop;
 208         const u32 *iprop;
 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         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 224         mdata->dai[0].ops = &p1022_ds_ops;
 225
 226         /* ASoC core can match codec with device node */
 227         mdata->dai[0].codec_of_node = codec_np;
 228
 229         /* We register two DAIs per SSI, one for playback and the other for
 230          * capture.  We support codecs that have separate DAIs for both playback
 231          * and capture.
 232          */
 233         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 234
 235         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 236         mdata->dai[0].codec_dai_name = "wm8776-hifi-playback";
 237         mdata->dai[1].codec_dai_name = "wm8776-hifi-capture";
 238
 239         /* Get the device ID */
 240         iprop = of_get_property(np, "cell-index", NULL);
 241         if (!iprop) {
 242                 dev_err(&pdev->dev, "cell-index property not found\n");
 243                 ret = -EINVAL;
 244                 goto error;
 245         }
 246         mdata->ssi_id = be32_to_cpup(iprop);
 247
 248         /* Get the serial format and clock direction. */
 249         sprop = of_get_property(np, "fsl,mode", NULL);
 250         if (!sprop) {
 251                 dev_err(&pdev->dev, "fsl,mode property not found\n");
 252                 ret = -EINVAL;
 253                 goto error;
 254         }
 255
 256         if (strcasecmp(sprop, "i2s-slave") == 0) {
 257                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 258                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 259                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 260                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 261
 262                 /* In i2s-slave mode, the codec has its own clock source, so we
 263                  * need to get the frequency from the device tree and pass it to
 264                  * the codec driver.
 265                  */
 266                 iprop = of_get_property(codec_np, "clock-frequency", NULL);
 267                 if (!iprop || !*iprop) {
 268                         dev_err(&pdev->dev, "codec bus-frequency "
 269                                 "property is missing or invalid\n");
 270                         ret = -EINVAL;
 271                         goto error;
 272                 }
 273                 mdata->clk_frequency = be32_to_cpup(iprop);
 274         } else if (strcasecmp(sprop, "i2s-master") == 0) {
 275                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 276                         SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 277                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 278                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 279         } else if (strcasecmp(sprop, "lj-slave") == 0) {
 280                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 281                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 282                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 283                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 284         } else if (strcasecmp(sprop, "lj-master") == 0) {
 285                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 286                         SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 287                 mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 288                 mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 289         } else if (strcasecmp(sprop, "rj-slave") == 0) {
 290                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 291                         SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 292                 mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 293                 mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 294         } else if (strcasecmp(sprop, "rj-master") == 0) {
 295                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 296                         SND_SOC_DAIFMT_RIGHT_J | 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, "ac97-slave") == 0) {
 300                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 301                         SND_SOC_DAIFMT_AC97 | 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, "ac97-master") == 0) {
 305                 mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 306                         SND_SOC_DAIFMT_AC97 | 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 {
 310                 dev_err(&pdev->dev,
 311                         "unrecognized fsl,mode property '%s'\n", sprop);
 312                 ret = -EINVAL;
 313                 goto error;
 314         }
 315
 316         if (!mdata->clk_frequency) {
 317                 dev_err(&pdev->dev, "unknown clock frequency\n");
 318                 ret = -EINVAL;
 319                 goto error;
 320         }
 321
 322         /* Find the playback DMA channel to use. */
 323         mdata->dai[0].platform_name = mdata->platform_name[0];
 324         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 325                                        &mdata->dma_channel_id[0],
 326                                        &mdata->dma_id[0]);
 327         if (ret) {
 328                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 329                 goto error;
 330         }
 331
 332         /* Find the capture DMA channel to use. */
 333         mdata->dai[1].platform_name = mdata->platform_name[1];
 334         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 335                                        &mdata->dma_channel_id[1],
 336                                        &mdata->dma_id[1]);
 337         if (ret) {
 338                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 339                 goto error;
 340         }
 341
 342         /* Initialize our DAI data structure.  */
 343         mdata->dai[0].stream_name = "playback";
 344         mdata->dai[1].stream_name = "capture";
 345         mdata->dai[0].name = mdata->dai[0].stream_name;
 346         mdata->dai[1].name = mdata->dai[1].stream_name;
 347
 348         mdata->card.probe = p1022_ds_machine_probe;
 349         mdata->card.remove = p1022_ds_machine_remove;
 350         mdata->card.name = pdev->name; /* The platform driver name */
 351         mdata->card.owner = THIS_MODULE;
 352         mdata->card.dev = &pdev->dev;
 353         mdata->card.num_links = 2;
 354         mdata->card.dai_link = mdata->dai;
 355
 356         /* Register with ASoC */
 357         ret = snd_soc_register_card(&mdata->card);
 358         if (ret) {
 359                 dev_err(&pdev->dev, "could not register card\n");
 360                 goto error;
 361         }
 362
 363         of_node_put(codec_np);
 364
 365         return 0;
 366
 367 error:
 368         kfree(mdata);
 369 error_put:
 370         of_node_put(codec_np);
 371         return ret;
 372 }
 373
 374 /**
 375  * p1022_ds_remove: remove the platform device
 376  *
 377  * This function is called when the platform device is removed.
 378  */
 379 static int p1022_ds_remove(struct platform_device *pdev)
 380 {
 381         struct snd_soc_card *card = platform_get_drvdata(pdev);
 382         struct machine_data *mdata =
 383                 container_of(card, struct machine_data, card);
 384
 385         snd_soc_unregister_card(card);
 386         kfree(mdata);
 387
 388         return 0;
 389 }
 390
 391 static struct platform_driver p1022_ds_driver = {
 392         .probe = p1022_ds_probe,
 393         .remove = p1022_ds_remove,
 394         .driver = {
 395                 /*
 396                  * The name must match 'compatible' property in the device tree,
 397                  * in lowercase letters.
 398                  */
 399                 .name = "snd-soc-p1022ds",
 400         },
 401 };
 402
 403 /**
 404  * p1022_ds_init: machine driver initialization.
 405  *
 406  * This function is called when this module is loaded.
 407  */
 408 static int __init p1022_ds_init(void)
 409 {
 410         struct device_node *guts_np;
 411         struct resource res;
 412
 413         /* Get the physical address of the global utilities registers */
 414         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 415         if (of_address_to_resource(guts_np, 0, &res)) {
 416                 pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
 417                 of_node_put(guts_np);
 418                 return -EINVAL;
 419         }
 420         guts_phys = res.start;
 421         of_node_put(guts_np);
 422
 423         return platform_driver_register(&p1022_ds_driver);
 424 }
 425
 426 /**
 427  * p1022_ds_exit: machine driver exit
 428  *
 429  * This function is called when this driver is unloaded.
 430  */
 431 static void __exit p1022_ds_exit(void)
 432 {
 433         platform_driver_unregister(&p1022_ds_driver);
 434 }
 435
 436 module_init(p1022_ds_init);
 437 module_exit(p1022_ds_exit);
 438
 439 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 440 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
 441 MODULE_LICENSE("GPL v2");