linux/sound/soc/spear/spdif_in.c
<<
>>
Prefs
   1/*
   2 * ALSA SoC SPDIF In Audio Layer for spear processors
   3 *
   4 * Copyright (C) 2012 ST Microelectronics
   5 * Vipin Kumar <vipin.kumar@st.com>
   6 *
   7 * This file is licensed under the terms of the GNU General Public
   8 * License version 2. This program is licensed "as is" without any
   9 * warranty of any kind, whether express or implied.
  10 */
  11
  12#include <linux/clk.h>
  13#include <linux/delay.h>
  14#include <linux/device.h>
  15#include <linux/kernel.h>
  16#include <linux/init.h>
  17#include <linux/io.h>
  18#include <linux/ioport.h>
  19#include <linux/module.h>
  20#include <linux/platform_device.h>
  21#include <sound/dmaengine_pcm.h>
  22#include <sound/pcm.h>
  23#include <sound/pcm_params.h>
  24#include <sound/soc.h>
  25#include <sound/spear_dma.h>
  26#include <sound/spear_spdif.h>
  27#include "spdif_in_regs.h"
  28#include "spear_pcm.h"
  29
  30struct spdif_in_params {
  31        u32 format;
  32};
  33
  34struct spdif_in_dev {
  35        struct clk *clk;
  36        struct spear_dma_data dma_params;
  37        struct spdif_in_params saved_params;
  38        void *io_base;
  39        struct device *dev;
  40        void (*reset_perip)(void);
  41        int irq;
  42        struct snd_dmaengine_dai_dma_data dma_params_rx;
  43        struct snd_dmaengine_pcm_config config;
  44};
  45
  46static void spdif_in_configure(struct spdif_in_dev *host)
  47{
  48        u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
  49                SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
  50        ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
  51
  52        writel(ctrl, host->io_base + SPDIF_IN_CTRL);
  53        writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
  54}
  55
  56static int spdif_in_dai_probe(struct snd_soc_dai *dai)
  57{
  58        struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
  59
  60        host->dma_params_rx.filter_data = &host->dma_params;
  61        dai->capture_dma_data = &host->dma_params_rx;
  62
  63        return 0;
  64}
  65
  66static void spdif_in_shutdown(struct snd_pcm_substream *substream,
  67                struct snd_soc_dai *dai)
  68{
  69        struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
  70
  71        if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
  72                return;
  73
  74        writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
  75}
  76
  77static void spdif_in_format(struct spdif_in_dev *host, u32 format)
  78{
  79        u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
  80
  81        switch (format) {
  82        case SNDRV_PCM_FORMAT_S16_LE:
  83                ctrl |= SPDIF_XTRACT_16BIT;
  84                break;
  85
  86        case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
  87                ctrl &= ~SPDIF_XTRACT_16BIT;
  88                break;
  89        }
  90
  91        writel(ctrl, host->io_base + SPDIF_IN_CTRL);
  92}
  93
  94static int spdif_in_hw_params(struct snd_pcm_substream *substream,
  95                struct snd_pcm_hw_params *params,
  96                struct snd_soc_dai *dai)
  97{
  98        struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
  99        u32 format;
 100
 101        if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
 102                return -EINVAL;
 103
 104        format = params_format(params);
 105        host->saved_params.format = format;
 106
 107        return 0;
 108}
 109
 110static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
 111                struct snd_soc_dai *dai)
 112{
 113        struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
 114        u32 ctrl;
 115        int ret = 0;
 116
 117        if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
 118                return -EINVAL;
 119
 120        switch (cmd) {
 121        case SNDRV_PCM_TRIGGER_START:
 122        case SNDRV_PCM_TRIGGER_RESUME:
 123        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 124                clk_enable(host->clk);
 125                spdif_in_configure(host);
 126                spdif_in_format(host, host->saved_params.format);
 127
 128                ctrl = readl(host->io_base + SPDIF_IN_CTRL);
 129                ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
 130                writel(ctrl, host->io_base + SPDIF_IN_CTRL);
 131                writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
 132                break;
 133
 134        case SNDRV_PCM_TRIGGER_STOP:
 135        case SNDRV_PCM_TRIGGER_SUSPEND:
 136        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 137                ctrl = readl(host->io_base + SPDIF_IN_CTRL);
 138                ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
 139                writel(ctrl, host->io_base + SPDIF_IN_CTRL);
 140                writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
 141
 142                if (host->reset_perip)
 143                        host->reset_perip();
 144                clk_disable(host->clk);
 145                break;
 146
 147        default:
 148                ret = -EINVAL;
 149                break;
 150        }
 151        return ret;
 152}
 153
 154static struct snd_soc_dai_ops spdif_in_dai_ops = {
 155        .shutdown       = spdif_in_shutdown,
 156        .trigger        = spdif_in_trigger,
 157        .hw_params      = spdif_in_hw_params,
 158};
 159
 160static struct snd_soc_dai_driver spdif_in_dai = {
 161        .probe = spdif_in_dai_probe,
 162        .capture = {
 163                .channels_min = 2,
 164                .channels_max = 2,
 165                .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 166                                 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
 167                                 SNDRV_PCM_RATE_192000),
 168                .formats = SNDRV_PCM_FMTBIT_S16_LE | \
 169                           SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
 170        },
 171        .ops = &spdif_in_dai_ops,
 172};
 173
 174static const struct snd_soc_component_driver spdif_in_component = {
 175        .name           = "spdif-in",
 176};
 177
 178static irqreturn_t spdif_in_irq(int irq, void *arg)
 179{
 180        struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
 181
 182        u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
 183
 184        if (!irq_status)
 185                return IRQ_NONE;
 186
 187        if (irq_status & SPDIF_IRQ_FIFOWRITE)
 188                dev_err(host->dev, "spdif in: fifo write error");
 189        if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
 190                dev_err(host->dev, "spdif in: empty fifo read error");
 191        if (irq_status & SPDIF_IRQ_FIFOFULL)
 192                dev_err(host->dev, "spdif in: fifo full error");
 193        if (irq_status & SPDIF_IRQ_OUTOFRANGE)
 194                dev_err(host->dev, "spdif in: out of range error");
 195
 196        writel(0, host->io_base + SPDIF_IN_IRQ);
 197
 198        return IRQ_HANDLED;
 199}
 200
 201static int spdif_in_probe(struct platform_device *pdev)
 202{
 203        struct spdif_in_dev *host;
 204        struct spear_spdif_platform_data *pdata;
 205        struct resource *res, *res_fifo;
 206        int ret;
 207
 208        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 209        if (!res)
 210                return -EINVAL;
 211
 212        res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
 213        if (!res_fifo)
 214                return -EINVAL;
 215
 216        if (!devm_request_mem_region(&pdev->dev, res->start,
 217                                resource_size(res), pdev->name)) {
 218                dev_warn(&pdev->dev, "Failed to get memory resourse\n");
 219                return -ENOENT;
 220        }
 221
 222        host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 223        if (!host) {
 224                dev_warn(&pdev->dev, "kzalloc fail\n");
 225                return -ENOMEM;
 226        }
 227
 228        host->io_base = devm_ioremap(&pdev->dev, res->start,
 229                                resource_size(res));
 230        if (!host->io_base) {
 231                dev_warn(&pdev->dev, "ioremap failed\n");
 232                return -ENOMEM;
 233        }
 234
 235        host->irq = platform_get_irq(pdev, 0);
 236        if (host->irq < 0)
 237                return -EINVAL;
 238
 239        host->clk = devm_clk_get(&pdev->dev, NULL);
 240        if (IS_ERR(host->clk))
 241                return PTR_ERR(host->clk);
 242
 243        pdata = dev_get_platdata(&pdev->dev);
 244
 245        if (!pdata)
 246                return -EINVAL;
 247
 248        host->dma_params.data = pdata->dma_params;
 249        host->dma_params.addr = res_fifo->start;
 250        host->dma_params.max_burst = 16;
 251        host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 252        host->reset_perip = pdata->reset_perip;
 253
 254        host->dev = &pdev->dev;
 255        dev_set_drvdata(&pdev->dev, host);
 256
 257        ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
 258                        "spdif-in", host);
 259        if (ret) {
 260                dev_warn(&pdev->dev, "request_irq failed\n");
 261                return ret;
 262        }
 263
 264        ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
 265                                              &spdif_in_dai, 1);
 266        if (ret)
 267                return ret;
 268
 269        return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
 270                                                pdata->filter);
 271}
 272
 273static struct platform_driver spdif_in_driver = {
 274        .probe          = spdif_in_probe,
 275        .driver         = {
 276                .name   = "spdif-in",
 277        },
 278};
 279
 280module_platform_driver(spdif_in_driver);
 281
 282MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 283MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
 284MODULE_LICENSE("GPL");
 285MODULE_ALIAS("platform:spdif_in");
 286