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/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include <sound/spear_dma.h>
  25 #include <sound/spear_spdif.h>
  26 #include "spdif_in_regs.h"
  27
  28 struct spdif_in_params {
  29         u32 format;
  30 };
  31
  32 struct spdif_in_dev {
  33         struct clk *clk;
  34         struct spear_dma_data dma_params;
  35         struct spdif_in_params saved_params;
  36         void *io_base;
  37         struct device *dev;
  38         void (*reset_perip)(void);
  39         int irq;
  40 };
  41
  42 static void spdif_in_configure(struct spdif_in_dev *host)
  43 {
  44         u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
  45                 SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
  46         ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
  47
  48         writel(ctrl, host->io_base + SPDIF_IN_CTRL);
  49         writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
  50 }
  51
  52 static int spdif_in_startup(struct snd_pcm_substream *substream,
  53                 struct snd_soc_dai *cpu_dai)
  54 {
  55         struct spdif_in_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
  56
  57         if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
  58                 return -EINVAL;
  59
  60         snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);
  61         return 0;
  62 }
  63
  64 static void spdif_in_shutdown(struct snd_pcm_substream *substream,
  65                 struct snd_soc_dai *dai)
  66 {
  67         struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
  68
  69         if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
  70                 return;
  71
  72         writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
  73         snd_soc_dai_set_dma_data(dai, substream, NULL);
  74 }
  75
  76 static void spdif_in_format(struct spdif_in_dev *host, u32 format)
  77 {
  78         u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
  79
  80         switch (format) {
  81         case SNDRV_PCM_FORMAT_S16_LE:
  82                 ctrl |= SPDIF_XTRACT_16BIT;
  83                 break;
  84
  85         case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
  86                 ctrl &= ~SPDIF_XTRACT_16BIT;
  87                 break;
  88         }
  89
  90         writel(ctrl, host->io_base + SPDIF_IN_CTRL);
  91 }
  92
  93 static int spdif_in_hw_params(struct snd_pcm_substream *substream,
  94                 struct snd_pcm_hw_params *params,
  95                 struct snd_soc_dai *dai)
  96 {
  97         struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
  98         u32 format;
  99
 100         if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
 101                 return -EINVAL;
 102
 103         format = params_format(params);
 104         host->saved_params.format = format;
 105
 106         return 0;
 107 }
 108
 109 static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
 110                 struct snd_soc_dai *dai)
 111 {
 112         struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
 113         u32 ctrl;
 114         int ret = 0;
 115
 116         if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
 117                 return -EINVAL;
 118
 119         switch (cmd) {
 120         case SNDRV_PCM_TRIGGER_START:
 121         case SNDRV_PCM_TRIGGER_RESUME:
 122         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 123                 clk_enable(host->clk);
 124                 spdif_in_configure(host);
 125                 spdif_in_format(host, host->saved_params.format);
 126
 127                 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
 128                 ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
 129                 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
 130                 writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
 131                 break;
 132
 133         case SNDRV_PCM_TRIGGER_STOP:
 134         case SNDRV_PCM_TRIGGER_SUSPEND:
 135         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 136                 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
 137                 ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
 138                 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
 139                 writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
 140
 141                 if (host->reset_perip)
 142                         host->reset_perip();
 143                 clk_disable(host->clk);
 144                 break;
 145
 146         default:
 147                 ret = -EINVAL;
 148                 break;
 149         }
 150         return ret;
 151 }
 152
 153 static struct snd_soc_dai_ops spdif_in_dai_ops = {
 154         .startup        = spdif_in_startup,
 155         .shutdown       = spdif_in_shutdown,
 156         .trigger        = spdif_in_trigger,
 157         .hw_params      = spdif_in_hw_params,
 158 };
 159
 160 struct snd_soc_dai_driver spdif_in_dai = {
 161         .capture = {
 162                 .channels_min = 2,
 163                 .channels_max = 2,
 164                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 165                                  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
 166                                  SNDRV_PCM_RATE_192000),
 167                 .formats = SNDRV_PCM_FMTBIT_S16_LE | \
 168                            SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
 169         },
 170         .ops = &spdif_in_dai_ops,
 171 };
 172
 173 static irqreturn_t spdif_in_irq(int irq, void *arg)
 174 {
 175         struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
 176
 177         u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
 178
 179         if (!irq_status)
 180                 return IRQ_NONE;
 181
 182         if (irq_status & SPDIF_IRQ_FIFOWRITE)
 183                 dev_err(host->dev, "spdif in: fifo write error");
 184         if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
 185                 dev_err(host->dev, "spdif in: empty fifo read error");
 186         if (irq_status & SPDIF_IRQ_FIFOFULL)
 187                 dev_err(host->dev, "spdif in: fifo full error");
 188         if (irq_status & SPDIF_IRQ_OUTOFRANGE)
 189                 dev_err(host->dev, "spdif in: out of range error");
 190
 191         writel(0, host->io_base + SPDIF_IN_IRQ);
 192
 193         return IRQ_HANDLED;
 194 }
 195
 196 static int spdif_in_probe(struct platform_device *pdev)
 197 {
 198         struct spdif_in_dev *host;
 199         struct spear_spdif_platform_data *pdata;
 200         struct resource *res, *res_fifo;
 201         int ret;
 202
 203         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 204         if (!res)
 205                 return -EINVAL;
 206
 207         res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
 208         if (!res_fifo)
 209                 return -EINVAL;
 210
 211         if (!devm_request_mem_region(&pdev->dev, res->start,
 212                                 resource_size(res), pdev->name)) {
 213                 dev_warn(&pdev->dev, "Failed to get memory resourse\n");
 214                 return -ENOENT;
 215         }
 216
 217         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
 218         if (!host) {
 219                 dev_warn(&pdev->dev, "kzalloc fail\n");
 220                 return -ENOMEM;
 221         }
 222
 223         host->io_base = devm_ioremap(&pdev->dev, res->start,
 224                                 resource_size(res));
 225         if (!host->io_base) {
 226                 dev_warn(&pdev->dev, "ioremap failed\n");
 227                 return -ENOMEM;
 228         }
 229
 230         host->irq = platform_get_irq(pdev, 0);
 231         if (host->irq < 0)
 232                 return -EINVAL;
 233
 234         host->clk = clk_get(&pdev->dev, NULL);
 235         if (IS_ERR(host->clk))
 236                 return PTR_ERR(host->clk);
 237
 238         pdata = dev_get_platdata(&pdev->dev);
 239
 240         if (!pdata)
 241                 return -EINVAL;
 242
 243         host->dma_params.data = pdata->dma_params;
 244         host->dma_params.addr = res_fifo->start;
 245         host->dma_params.max_burst = 16;
 246         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 247         host->dma_params.filter = pdata->filter;
 248         host->reset_perip = pdata->reset_perip;
 249
 250         host->dev = &pdev->dev;
 251         dev_set_drvdata(&pdev->dev, host);
 252
 253         ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
 254                         "spdif-in", host);
 255         if (ret) {
 256                 clk_put(host->clk);
 257                 dev_warn(&pdev->dev, "request_irq failed\n");
 258                 return ret;
 259         }
 260
 261         ret = snd_soc_register_dai(&pdev->dev, &spdif_in_dai);
 262         if (ret != 0) {
 263                 clk_put(host->clk);
 264                 return ret;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int spdif_in_remove(struct platform_device *pdev)
 271 {
 272         struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev);
 273
 274         snd_soc_unregister_dai(&pdev->dev);
 275         dev_set_drvdata(&pdev->dev, NULL);
 276
 277         clk_put(host->clk);
 278
 279         return 0;
 280 }
 281
 282
 283 static struct platform_driver spdif_in_driver = {
 284         .probe          = spdif_in_probe,
 285         .remove         = spdif_in_remove,
 286         .driver         = {
 287                 .name   = "spdif-in",
 288                 .owner  = THIS_MODULE,
 289         },
 290 };
 291
 292 module_platform_driver(spdif_in_driver);
 293
 294 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 295 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
 296 MODULE_LICENSE("GPL");
 297 MODULE_ALIAS("platform:spdif_in");