--- /dev/null
+/*
+ * ALSA SoC SPDIF In Audio Layer for spear processors
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Vipin Kumar <vipin.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/spear_dma.h>
+#include <sound/spear_spdif.h>
+#include "spdif_in_regs.h"
+
+struct spdif_in_params {
+ u32 format;
+};
+
+struct spdif_in_dev {
+ struct clk *clk;
+ struct spear_dma_data dma_params;
+ struct spdif_in_params saved_params;
+ void *io_base;
+ struct device *dev;
+ void (*reset_perip)(void);
+ int irq;
+};
+
+static void spdif_in_configure(struct spdif_in_dev *host)
+{
+ u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
+ SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
+ ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
+
+ writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+ writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
+}
+
+static int spdif_in_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct spdif_in_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+
+ if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return -EINVAL;
+
+ snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);
+ return 0;
+}
+
+static void spdif_in_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+
+ if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return;
+
+ writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
+ snd_soc_dai_set_dma_data(dai, substream, NULL);
+}
+
+static void spdif_in_format(struct spdif_in_dev *host, u32 format)
+{
+ u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+
+ switch (format) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ ctrl |= SPDIF_XTRACT_16BIT;
+ break;
+
+ case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
+ ctrl &= ~SPDIF_XTRACT_16BIT;
+ break;
+ }
+
+ writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+}
+
+static int spdif_in_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+ u32 format;
+
+ if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return -EINVAL;
+
+ format = params_format(params);
+ host->saved_params.format = format;
+
+ return 0;
+}
+
+static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+ u32 ctrl;
+ int ret = 0;
+
+ if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return -EINVAL;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ clk_enable(host->clk);
+ spdif_in_configure(host);
+ spdif_in_format(host, host->saved_params.format);
+
+ ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+ ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
+ writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+ writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+ ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
+ writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+ writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
+
+ if (host->reset_perip)
+ host->reset_perip();
+ clk_disable(host->clk);
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static struct snd_soc_dai_ops spdif_in_dai_ops = {
+ .startup = spdif_in_startup,
+ .shutdown = spdif_in_shutdown,
+ .trigger = spdif_in_trigger,
+ .hw_params = spdif_in_hw_params,
+};
+
+struct snd_soc_dai_driver spdif_in_dai = {
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
+ SNDRV_PCM_RATE_192000),
+ .formats = SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
+ },
+ .ops = &spdif_in_dai_ops,
+};
+
+static irqreturn_t spdif_in_irq(int irq, void *arg)
+{
+ struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
+
+ u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
+
+ if (!irq_status)
+ return IRQ_NONE;
+
+ if (irq_status & SPDIF_IRQ_FIFOWRITE)
+ dev_err(host->dev, "spdif in: fifo write error");
+ if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
+ dev_err(host->dev, "spdif in: empty fifo read error");
+ if (irq_status & SPDIF_IRQ_FIFOFULL)
+ dev_err(host->dev, "spdif in: fifo full error");
+ if (irq_status & SPDIF_IRQ_OUTOFRANGE)
+ dev_err(host->dev, "spdif in: out of range error");
+
+ writel(0, host->io_base + SPDIF_IN_IRQ);
+
+ return IRQ_HANDLED;
+}
+
+static int spdif_in_probe(struct platform_device *pdev)
+{
+ struct spdif_in_dev *host;
+ struct spear_spdif_platform_data *pdata;
+ struct resource *res, *res_fifo;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res_fifo)
+ return -EINVAL;
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), pdev->name)) {
+ dev_warn(&pdev->dev, "Failed to get memory resourse\n");
+ return -ENOENT;
+ }
+
+ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+ if (!host) {
+ dev_warn(&pdev->dev, "kzalloc fail\n");
+ return -ENOMEM;
+ }
+
+ host->io_base = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!host->io_base) {
+ dev_warn(&pdev->dev, "ioremap failed\n");
+ return -ENOMEM;
+ }
+
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq < 0)
+ return -EINVAL;
+
+ host->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(host->clk))
+ return PTR_ERR(host->clk);
+
+ pdata = dev_get_platdata(&pdev->dev);
+
+ if (!pdata)
+ return -EINVAL;
+
+ host->dma_params.data = pdata->dma_params;
+ host->dma_params.addr = res_fifo->start;
+ host->dma_params.max_burst = 16;
+ host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ host->dma_params.filter = pdata->filter;
+ host->reset_perip = pdata->reset_perip;
+
+ host->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, host);
+
+ ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
+ "spdif-in", host);
+ if (ret) {
+ clk_put(host->clk);
+ dev_warn(&pdev->dev, "request_irq failed\n");
+ return ret;
+ }
+
+ ret = snd_soc_register_dai(&pdev->dev, &spdif_in_dai);
+ if (ret != 0) {
+ clk_put(host->clk);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int spdif_in_remove(struct platform_device *pdev)
+{
+ struct spdif_in_dev *host = dev_get_drvdata(&pdev->dev);
+
+ snd_soc_unregister_dai(&pdev->dev);
+ dev_set_drvdata(&pdev->dev, NULL);
+
+ clk_put(host->clk);
+
+ return 0;
+}
+
+
+static struct platform_driver spdif_in_driver = {
+ .probe = spdif_in_probe,
+ .remove = spdif_in_remove,
+ .driver = {
+ .name = "spdif-in",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(spdif_in_driver);
+
+MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
+MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:spdif_in");
--- /dev/null
+/*
+ * SPEAr SPDIF IN controller header file
+ *
+ * Copyright (ST) 2011 Vipin Kumar (vipin.kumar@st.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef SPDIF_IN_REGS_H
+#define SPDIF_IN_REGS_H
+
+#define SPDIF_IN_CTRL 0x00
+ #define SPDIF_IN_PRTYEN (1 << 20)
+ #define SPDIF_IN_STATEN (1 << 19)
+ #define SPDIF_IN_USREN (1 << 18)
+ #define SPDIF_IN_VALEN (1 << 17)
+ #define SPDIF_IN_BLKEN (1 << 16)
+
+ #define SPDIF_MODE_24BIT (8 << 12)
+ #define SPDIF_MODE_23BIT (7 << 12)
+ #define SPDIF_MODE_22BIT (6 << 12)
+ #define SPDIF_MODE_21BIT (5 << 12)
+ #define SPDIF_MODE_20BIT (4 << 12)
+ #define SPDIF_MODE_19BIT (3 << 12)
+ #define SPDIF_MODE_18BIT (2 << 12)
+ #define SPDIF_MODE_17BIT (1 << 12)
+ #define SPDIF_MODE_16BIT (0 << 12)
+ #define SPDIF_MODE_MASK (0x0F << 12)
+
+ #define SPDIF_IN_VALID (1 << 11)
+ #define SPDIF_IN_SAMPLE (1 << 10)
+ #define SPDIF_DATA_SWAP (1 << 9)
+ #define SPDIF_IN_ENB (1 << 8)
+ #define SPDIF_DATA_REVERT (1 << 7)
+ #define SPDIF_XTRACT_16BIT (1 << 6)
+ #define SPDIF_FIFO_THRES_16 (16 << 0)
+
+#define SPDIF_IN_IRQ_MASK 0x04
+#define SPDIF_IN_IRQ 0x08
+ #define SPDIF_IRQ_FIFOWRITE (1 << 0)
+ #define SPDIF_IRQ_EMPTYFIFOREAD (1 << 1)
+ #define SPDIF_IRQ_FIFOFULL (1 << 2)
+ #define SPDIF_IRQ_OUTOFRANGE (1 << 3)
+
+#define SPDIF_IN_STA 0x0C
+ #define SPDIF_IN_LOCK (0x1 << 0)
+
+#endif /* SPDIF_IN_REGS_H */
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