ASoC: SPEAr spdif_in: Add spdif IN support

This patch implements the spdif IN driver for ST peripheral

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 386 insertions, 0 deletions

diff --git a/include/sound/spear_spdif.h b/include/sound/spear_spdif.h
new file mode 100644
index 000000000000..a12f39695610
--- /dev/null
+++ b/include/sound/spear_spdif.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (ST) 2012 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 __SOUND_SPDIF_H
+#define __SOUND_SPDIF_H
+
+struct spear_spdif_platform_data {
+        /* DMA params */
+        void *dma_params;
+        bool (*filter)(struct dma_chan *chan, void *slave);
+        void (*reset_perip)(void);
+};
+
+#endif /* SOUND_SPDIF_H */
diff --git a/sound/soc/spear/spdif_in.c b/sound/soc/spear/spdif_in.c
new file mode 100644
index 000000000000..c7c4b20395bb
--- /dev/null
+++ b/sound/soc/spear/spdif_in.c
@@ -0,0 +1,297 @@
+/*
+ * 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");
diff --git a/sound/soc/spear/spdif_in_regs.h b/sound/soc/spear/spdif_in_regs.h
new file mode 100644
index 000000000000..37af7bc66b7f
--- /dev/null
+++ b/sound/soc/spear/spdif_in_regs.h
@@ -0,0 +1,60 @@
+/*
+ * 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 */