sound/soc/fsl/p1022_rdk.c

   1 /**
   2  * Freescale P1022RDK ALSA SoC Machine driver
   3  *
   4  * Author: Timur Tabi <timur@freescale.com>
   5  *
   6  * Copyright 2012 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  * Note: in order for audio to work correctly, the output controls need
  13  * to be enabled, because they control the clock.  So for playback, for
  14  * example:
  15  *
  16  *      amixer sset 'Left Output Mixer PCM' on
  17  *      amixer sset 'Right Output Mixer PCM' on
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/of_address.h>
  23 #include <linux/of_device.h>
  24 #include <linux/slab.h>
  25 #include <sound/soc.h>
  26 #include <asm/fsl_guts.h>
  27
  28 #include "fsl_dma.h"
  29 #include "fsl_ssi.h"
  30 #include "fsl_utils.h"
  31
  32 /* P1022-specific PMUXCR and DMUXCR bit definitions */
  33
  34 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK        0x0001c000
  35 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI   0x00010000
  36 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI         0x00018000
  37
  38 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK       0x00000c00
  39 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI        0x00000000
  40
  41 #define CCSR_GUTS_DMUXCR_PAD    1       /* DMA controller/channel set to pad */
  42 #define CCSR_GUTS_DMUXCR_SSI    2       /* DMA controller/channel set to SSI */
  43
  44 /*
  45  * Set the DMACR register in the GUTS
  46  *
  47  * The DMACR register determines the source of initiated transfers for each
  48  * channel on each DMA controller.  Rather than have a bunch of repetitive
  49  * macros for the bit patterns, we just have a function that calculates
  50  * them.
  51  *
  52  * guts: Pointer to GUTS structure
  53  * co: The DMA controller (0 or 1)
  54  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  55  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  56  */
  57 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
  58         unsigned int co, unsigned int ch, unsigned int device)
  59 {
  60         unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));
  61
  62         clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
  63 }
  64
  65 /* There's only one global utilities register */
  66 static phys_addr_t guts_phys;
  67
  68 /**
  69  * machine_data: machine-specific ASoC device data
  70  *
  71  * This structure contains data for a single sound platform device on an
  72  * P1022 RDK.  Some of the data is taken from the device tree.
  73  */
  74 struct machine_data {
  75         struct snd_soc_dai_link dai[2];
  76         struct snd_soc_card card;
  77         unsigned int dai_format;
  78         unsigned int codec_clk_direction;
  79         unsigned int cpu_clk_direction;
  80         unsigned int clk_frequency;
  81         unsigned int dma_id[2];         /* 0 = DMA1, 1 = DMA2, etc */
  82         unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
  83         char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
  84 };
  85
  86 /**
  87  * p1022_rdk_machine_probe: initialize the board
  88  *
  89  * This function is used to initialize the board-specific hardware.
  90  *
  91  * Here we program the DMACR and PMUXCR registers.
  92  */
  93 static int p1022_rdk_machine_probe(struct snd_soc_card *card)
  94 {
  95         struct machine_data *mdata =
  96                 container_of(card, struct machine_data, card);
  97         struct ccsr_guts __iomem *guts;
  98
  99         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 100         if (!guts) {
 101                 dev_err(card->dev, "could not map global utilities\n");
 102                 return -ENOMEM;
 103         }
 104
 105         /* Enable SSI Tx signal */
 106         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
 107                         CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);
 108
 109         /* Enable SSI Rx signal */
 110         clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 111                         CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);
 112
 113         /* Enable DMA Channel for SSI */
 114         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 115                         CCSR_GUTS_DMUXCR_SSI);
 116
 117         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 118                         CCSR_GUTS_DMUXCR_SSI);
 119
 120         iounmap(guts);
 121
 122         return 0;
 123 }
 124
 125 /**
 126  * p1022_rdk_startup: program the board with various hardware parameters
 127  *
 128  * This function takes board-specific information, like clock frequencies
 129  * and serial data formats, and passes that information to the codec and
 130  * transport drivers.
 131  */
 132 static int p1022_rdk_startup(struct snd_pcm_substream *substream)
 133 {
 134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 135         struct machine_data *mdata =
 136                 container_of(rtd->card, struct machine_data, card);
 137         struct device *dev = rtd->card->dev;
 138         int ret = 0;
 139
 140         /* Tell the codec driver what the serial protocol is. */
 141         ret = snd_soc_dai_set_fmt(rtd->codec_dai, mdata->dai_format);
 142         if (ret < 0) {
 143                 dev_err(dev, "could not set codec driver audio format (ret=%i)\n",
 144                         ret);
 145                 return ret;
 146         }
 147
 148         ret = snd_soc_dai_set_pll(rtd->codec_dai, 0, 0, mdata->clk_frequency,
 149                 mdata->clk_frequency);
 150         if (ret < 0) {
 151                 dev_err(dev, "could not set codec PLL frequency (ret=%i)\n",
 152                         ret);
 153                 return ret;
 154         }
 155
 156         return 0;
 157 }
 158
 159 /**
 160  * p1022_rdk_machine_remove: Remove the sound device
 161  *
 162  * This function is called to remove the sound device for one SSI.  We
 163  * de-program the DMACR and PMUXCR register.
 164  */
 165 static int p1022_rdk_machine_remove(struct snd_soc_card *card)
 166 {
 167         struct machine_data *mdata =
 168                 container_of(card, struct machine_data, card);
 169         struct ccsr_guts __iomem *guts;
 170
 171         guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 172         if (!guts) {
 173                 dev_err(card->dev, "could not map global utilities\n");
 174                 return -ENOMEM;
 175         }
 176
 177         /* Restore the signal routing */
 178         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 179         clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 180         guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 181         guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);
 182
 183         iounmap(guts);
 184
 185         return 0;
 186 }
 187
 188 /**
 189  * p1022_rdk_ops: ASoC machine driver operations
 190  */
 191 static struct snd_soc_ops p1022_rdk_ops = {
 192         .startup = p1022_rdk_startup,
 193 };
 194
 195 /**
 196  * p1022_rdk_probe: platform probe function for the machine driver
 197  *
 198  * Although this is a machine driver, the SSI node is the "master" node with
 199  * respect to audio hardware connections.  Therefore, we create a new ASoC
 200  * device for each new SSI node that has a codec attached.
 201  */
 202 static int p1022_rdk_probe(struct platform_device *pdev)
 203 {
 204         struct device *dev = pdev->dev.parent;
 205         /* ssi_pdev is the platform device for the SSI node that probed us */
 206         struct platform_device *ssi_pdev =
 207                 container_of(dev, struct platform_device, dev);
 208         struct device_node *np = ssi_pdev->dev.of_node;
 209         struct device_node *codec_np = NULL;
 210         struct machine_data *mdata;
 211         const u32 *iprop;
 212         int ret;
 213
 214         /* Find the codec node for this SSI. */
 215         codec_np = of_parse_phandle(np, "codec-handle", 0);
 216         if (!codec_np) {
 217                 dev_err(dev, "could not find codec node\n");
 218                 return -EINVAL;
 219         }
 220
 221         mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL);
 222         if (!mdata) {
 223                 ret = -ENOMEM;
 224                 goto error_put;
 225         }
 226
 227         mdata->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 228         mdata->dai[0].ops = &p1022_rdk_ops;
 229
 230         /* ASoC core can match codec with device node */
 231         mdata->dai[0].codec_of_node = codec_np;
 232
 233         /*
 234          * We register two DAIs per SSI, one for playback and the other for
 235          * capture.  We support codecs that have separate DAIs for both playback
 236          * and capture.
 237          */
 238         memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link));
 239
 240         /* The DAI names from the codec (snd_soc_dai_driver.name) */
 241         mdata->dai[0].codec_dai_name = "wm8960-hifi";
 242         mdata->dai[1].codec_dai_name = mdata->dai[0].codec_dai_name;
 243
 244         /*
 245          * Configure the SSI for I2S slave mode.  Older device trees have
 246          * an fsl,mode property, but we ignore that since there's really
 247          * only one way to configure the SSI.
 248          */
 249         mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 250                 SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 251         mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 252         mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 253
 254         /*
 255          * In i2s-slave mode, the codec has its own clock source, so we
 256          * need to get the frequency from the device tree and pass it to
 257          * the codec driver.
 258          */
 259         iprop = of_get_property(codec_np, "clock-frequency", NULL);
 260         if (!iprop || !*iprop) {
 261                 dev_err(&pdev->dev, "codec bus-frequency property is missing or invalid\n");
 262                 ret = -EINVAL;
 263                 goto error;
 264         }
 265         mdata->clk_frequency = be32_to_cpup(iprop);
 266
 267         if (!mdata->clk_frequency) {
 268                 dev_err(&pdev->dev, "unknown clock frequency\n");
 269                 ret = -EINVAL;
 270                 goto error;
 271         }
 272
 273         /* Find the playback DMA channel to use. */
 274         mdata->dai[0].platform_name = mdata->platform_name[0];
 275         ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0],
 276                                        &mdata->dma_channel_id[0],
 277                                        &mdata->dma_id[0]);
 278         if (ret) {
 279                 dev_err(&pdev->dev, "missing/invalid playback DMA phandle (ret=%i)\n",
 280                         ret);
 281                 goto error;
 282         }
 283
 284         /* Find the capture DMA channel to use. */
 285         mdata->dai[1].platform_name = mdata->platform_name[1];
 286         ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1],
 287                                        &mdata->dma_channel_id[1],
 288                                        &mdata->dma_id[1]);
 289         if (ret) {
 290                 dev_err(&pdev->dev, "missing/invalid capture DMA phandle (ret=%i)\n",
 291                         ret);
 292                 goto error;
 293         }
 294
 295         /* Initialize our DAI data structure.  */
 296         mdata->dai[0].stream_name = "playback";
 297         mdata->dai[1].stream_name = "capture";
 298         mdata->dai[0].name = mdata->dai[0].stream_name;
 299         mdata->dai[1].name = mdata->dai[1].stream_name;
 300
 301         mdata->card.probe = p1022_rdk_machine_probe;
 302         mdata->card.remove = p1022_rdk_machine_remove;
 303         mdata->card.name = pdev->name; /* The platform driver name */
 304         mdata->card.owner = THIS_MODULE;
 305         mdata->card.dev = &pdev->dev;
 306         mdata->card.num_links = 2;
 307         mdata->card.dai_link = mdata->dai;
 308
 309         /* Register with ASoC */
 310         ret = snd_soc_register_card(&mdata->card);
 311         if (ret) {
 312                 dev_err(&pdev->dev, "could not register card (ret=%i)\n", ret);
 313                 goto error;
 314         }
 315
 316         return 0;
 317
 318 error:
 319         kfree(mdata);
 320 error_put:
 321         of_node_put(codec_np);
 322         return ret;
 323 }
 324
 325 /**
 326  * p1022_rdk_remove: remove the platform device
 327  *
 328  * This function is called when the platform device is removed.
 329  */
 330 static int p1022_rdk_remove(struct platform_device *pdev)
 331 {
 332         struct snd_soc_card *card = platform_get_drvdata(pdev);
 333         struct machine_data *mdata =
 334                 container_of(card, struct machine_data, card);
 335
 336         snd_soc_unregister_card(card);
 337         kfree(mdata);
 338
 339         return 0;
 340 }
 341
 342 static struct platform_driver p1022_rdk_driver = {
 343         .probe = p1022_rdk_probe,
 344         .remove = p1022_rdk_remove,
 345         .driver = {
 346                 /*
 347                  * The name must match 'compatible' property in the device tree,
 348                  * in lowercase letters.
 349                  */
 350                 .name = "snd-soc-p1022rdk",
 351                 .owner = THIS_MODULE,
 352         },
 353 };
 354
 355 /**
 356  * p1022_rdk_init: machine driver initialization.
 357  *
 358  * This function is called when this module is loaded.
 359  */
 360 static int __init p1022_rdk_init(void)
 361 {
 362         struct device_node *guts_np;
 363         struct resource res;
 364
 365         /* Get the physical address of the global utilities registers */
 366         guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 367         if (of_address_to_resource(guts_np, 0, &res)) {
 368                 pr_err("snd-soc-p1022rdk: missing/invalid global utils node\n");
 369                 of_node_put(guts_np);
 370                 return -EINVAL;
 371         }
 372         guts_phys = res.start;
 373         of_node_put(guts_np);
 374
 375         return platform_driver_register(&p1022_rdk_driver);
 376 }
 377
 378 /**
 379  * p1022_rdk_exit: machine driver exit
 380  *
 381  * This function is called when this driver is unloaded.
 382  */
 383 static void __exit p1022_rdk_exit(void)
 384 {
 385         platform_driver_unregister(&p1022_rdk_driver);
 386 }
 387
 388 late_initcall(p1022_rdk_init);
 389 module_exit(p1022_rdk_exit);
 390
 391 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 392 MODULE_DESCRIPTION("Freescale / iVeia P1022 RDK ALSA SoC machine driver");
 393 MODULE_LICENSE("GPL v2");