sound/soc/spear/spdif_in.c

   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
  30 struct spdif_in_params {
  31         u32 format;
  32 };
  33
  34 struct 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
  46 static 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
  56 static 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
  66 static 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
  77 static 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
  94 static 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
 110 static 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
 154 static const 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
 160 static 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
 174 static const struct snd_soc_component_driver spdif_in_component = {
 175         .name           = "spdif-in",
 176 };
 177
 178 static 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
 201 static 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_fifo;
 206         void __iomem *io_base;
 207         int ret;
 208
 209         io_base = devm_platform_ioremap_resource(pdev, 0);
 210         if (IS_ERR(io_base))
 211                 return PTR_ERR(io_base);
 212
 213         res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
 214         if (!res_fifo)
 215                 return -EINVAL;
 216
 217         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 218         if (!host)
 219                 return -ENOMEM;
 220
 221         host->io_base = io_base;
 222         host->irq = platform_get_irq(pdev, 0);
 223         if (host->irq < 0) {
 224                 dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq);
 225                 return host->irq;
 226         }
 227
 228         host->clk = devm_clk_get(&pdev->dev, NULL);
 229         if (IS_ERR(host->clk))
 230                 return PTR_ERR(host->clk);
 231
 232         pdata = dev_get_platdata(&pdev->dev);
 233
 234         if (!pdata)
 235                 return -EINVAL;
 236
 237         host->dma_params.data = pdata->dma_params;
 238         host->dma_params.addr = res_fifo->start;
 239         host->dma_params.max_burst = 16;
 240         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 241         host->reset_perip = pdata->reset_perip;
 242
 243         host->dev = &pdev->dev;
 244         dev_set_drvdata(&pdev->dev, host);
 245
 246         ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
 247                         "spdif-in", host);
 248         if (ret) {
 249                 dev_warn(&pdev->dev, "request_irq failed\n");
 250                 return ret;
 251         }
 252
 253         ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
 254                                               &spdif_in_dai, 1);
 255         if (ret)
 256                 return ret;
 257
 258         return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
 259                                                 pdata->filter);
 260 }
 261
 262 static struct platform_driver spdif_in_driver = {
 263         .probe          = spdif_in_probe,
 264         .driver         = {
 265                 .name   = "spdif-in",
 266         },
 267 };
 268
 269 module_platform_driver(spdif_in_driver);
 270
 271 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 272 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
 273 MODULE_LICENSE("GPL");
 274 MODULE_ALIAS("platform:spdif_in");