ASoC: SPEAr spdif_out: Add spdif out support

This patch implements the spdif out driver for ST peripheral. This
peripheral implements IEC60958 standard

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>

2 files changed, 468 insertions, 0 deletions

diff --git a/sound/soc/spear/spdif_out.c b/sound/soc/spear/spdif_out.c
new file mode 100644
index 000000000000..5eac4cda2fd7
--- /dev/null
+++ b/sound/soc/spear/spdif_out.c
@@ -0,0 +1,389 @@
+/*
+ * ALSA SoC SPDIF Out 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/soc.h>
+#include <sound/spear_dma.h>
+#include <sound/spear_spdif.h>
+#include "spdif_out_regs.h"
+
+struct spdif_out_params {
+        u32 rate;
+        u32 core_freq;
+        u32 mute;
+};
+
+struct spdif_out_dev {
+        struct clk *clk;
+        struct spear_dma_data dma_params;
+        struct spdif_out_params saved_params;
+        u32 running;
+        void __iomem *io_base;
+};
+
+static void spdif_out_configure(struct spdif_out_dev *host)
+{
+        writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
+        mdelay(1);
+        writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
+                        host->io_base + SPDIF_OUT_SOFT_RST);
+
+        writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
+                        SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
+                        SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
+                        host->io_base + SPDIF_OUT_CFG);
+
+        writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
+        writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
+}
+
+static int spdif_out_startup(struct snd_pcm_substream *substream,
+                struct snd_soc_dai *cpu_dai)
+{
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+        int ret;
+
+        if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+                return -EINVAL;
+
+        snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);
+
+        ret = clk_enable(host->clk);
+        if (ret)
+                return ret;
+
+        host->running = true;
+        spdif_out_configure(host);
+
+        return 0;
+}
+
+static void spdif_out_shutdown(struct snd_pcm_substream *substream,
+                struct snd_soc_dai *dai)
+{
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+
+        if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+                return;
+
+        clk_disable(host->clk);
+        host->running = false;
+        snd_soc_dai_set_dma_data(dai, substream, NULL);
+}
+
+static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
+                u32 rate)
+{
+        u32 divider, ctrl;
+
+        clk_set_rate(host->clk, core_freq);
+        divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
+
+        ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+        ctrl &= ~SPDIF_DIVIDER_MASK;
+        ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
+        writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+}
+
+static int spdif_out_hw_params(struct snd_pcm_substream *substream,
+                struct snd_pcm_hw_params *params,
+                struct snd_soc_dai *dai)
+{
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+        u32 rate, core_freq;
+
+        if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+                return -EINVAL;
+
+        rate = params_rate(params);
+
+        switch (rate) {
+        case 8000:
+        case 16000:
+        case 32000:
+        case 64000:
+                /*
+                 * The clock is multiplied by 10 to bring it to feasible range
+                 * of frequencies for sscg
+                 */
+                core_freq = 64000 * 128 * 10;   /* 81.92 MHz */
+                break;
+        case 5512:
+        case 11025:
+        case 22050:
+        case 44100:
+        case 88200:
+        case 176400:
+                core_freq = 176400 * 128;       /* 22.5792 MHz */
+                break;
+        case 48000:
+        case 96000:
+        case 192000:
+        default:
+                core_freq = 192000 * 128;       /* 24.576 MHz */
+                break;
+        }
+
+        spdif_out_clock(host, core_freq, rate);
+        host->saved_params.core_freq = core_freq;
+        host->saved_params.rate = rate;
+
+        return 0;
+}
+
+static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
+                struct snd_soc_dai *dai)
+{
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+        u32 ctrl;
+        int ret = 0;
+
+        if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+                return -EINVAL;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                        ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+                        ctrl &= ~SPDIF_OPMODE_MASK;
+                        if (!host->saved_params.mute)
+                                ctrl |= SPDIF_OPMODE_AUD_DATA |
+                                        SPDIF_STATE_NORMAL;
+                        else
+                                ctrl |= SPDIF_OPMODE_MUTE_PCM;
+                        writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+                ctrl &= ~SPDIF_OPMODE_MASK;
+                ctrl |= SPDIF_OPMODE_OFF;
+                writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+                break;
+
+        default:
+                ret = -EINVAL;
+                break;
+        }
+        return ret;
+}
+
+static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+        u32 val;
+
+        host->saved_params.mute = mute;
+        val = readl(host->io_base + SPDIF_OUT_CTRL);
+        val &= ~SPDIF_OPMODE_MASK;
+
+        if (mute)
+                val |= SPDIF_OPMODE_MUTE_PCM;
+        else {
+                if (host->running)
+                        val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
+                else
+                        val |= SPDIF_OPMODE_OFF;
+        }
+
+        writel(val, host->io_base + SPDIF_OUT_CTRL);
+        return 0;
+}
+
+static int spdif_mute_get(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct snd_soc_card *card = codec->card;
+        struct snd_soc_pcm_runtime *rtd = card->rtd;
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+
+        ucontrol->value.integer.value[0] = host->saved_params.mute;
+        return 0;
+}
+
+static int spdif_mute_put(struct snd_kcontrol *kcontrol,
+                struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+        struct snd_soc_card *card = codec->card;
+        struct snd_soc_pcm_runtime *rtd = card->rtd;
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+        struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+
+        if (host->saved_params.mute == ucontrol->value.integer.value[0])
+                return 0;
+
+        spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
+
+        return 1;
+}
+static const struct snd_kcontrol_new spdif_out_controls[] = {
+        SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
+                        spdif_mute_get, spdif_mute_put),
+};
+
+int spdif_soc_dai_probe(struct snd_soc_dai *dai)
+{
+        return snd_soc_add_dai_controls(dai, spdif_out_controls,
+                                ARRAY_SIZE(spdif_out_controls));
+}
+
+static const struct snd_soc_dai_ops spdif_out_dai_ops = {
+        .digital_mute   = spdif_digital_mute,
+        .startup        = spdif_out_startup,
+        .shutdown       = spdif_out_shutdown,
+        .trigger        = spdif_out_trigger,
+        .hw_params      = spdif_out_hw_params,
+};
+
+static struct snd_soc_dai_driver spdif_out_dai = {
+        .playback = {
+                .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,
+        },
+        .probe = spdif_soc_dai_probe,
+        .ops = &spdif_out_dai_ops,
+};
+
+static int spdif_out_probe(struct platform_device *pdev)
+{
+        struct spdif_out_dev *host;
+        struct spear_spdif_platform_data *pdata;
+        struct resource *res;
+        int ret;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                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->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(host->clk))
+                return PTR_ERR(host->clk);
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        host->dma_params.data = pdata->dma_params;
+        host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
+        host->dma_params.max_burst = 16;
+        host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+        host->dma_params.filter = pdata->filter;
+
+        dev_set_drvdata(&pdev->dev, host);
+
+        ret = snd_soc_register_dai(&pdev->dev, &spdif_out_dai);
+        if (ret != 0) {
+                clk_put(host->clk);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int spdif_out_remove(struct platform_device *pdev)
+{
+        struct spdif_out_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;
+}
+
+#ifdef CONFIG_PM
+static int spdif_out_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
+
+        if (host->running)
+                clk_disable(host->clk);
+
+        return 0;
+}
+
+static int spdif_out_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
+
+        if (host->running) {
+                clk_enable(host->clk);
+                spdif_out_configure(host);
+                spdif_out_clock(host, host->saved_params.core_freq,
+                                host->saved_params.rate);
+        }
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
+                spdif_out_resume);
+
+#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
+
+#else
+#define SPDIF_OUT_DEV_PM_OPS NULL
+
+#endif
+
+static struct platform_driver spdif_out_driver = {
+        .probe          = spdif_out_probe,
+        .remove         = spdif_out_remove,
+        .driver         = {
+                .name   = "spdif-out",
+                .owner  = THIS_MODULE,
+                .pm     = SPDIF_OUT_DEV_PM_OPS,
+        },
+};
+
+module_platform_driver(spdif_out_driver);
+
+MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
+MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:spdif_out");
diff --git a/sound/soc/spear/spdif_out_regs.h b/sound/soc/spear/spdif_out_regs.h
new file mode 100644
index 000000000000..a5e53324b452
--- /dev/null
+++ b/sound/soc/spear/spdif_out_regs.h
@@ -0,0 +1,79 @@
+/*
+ * SPEAr SPDIF OUT 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_OUT_REGS_H
+#define SPDIF_OUT_REGS_H
+
+#define SPDIF_OUT_SOFT_RST      0x00
+        #define SPDIF_OUT_RESET         (1 << 0)
+#define SPDIF_OUT_FIFO_DATA     0x04
+#define SPDIF_OUT_INT_STA       0x08
+#define SPDIF_OUT_INT_STA_CLR   0x0C
+        #define SPDIF_INT_UNDERFLOW     (1 << 0)
+        #define SPDIF_INT_EODATA        (1 << 1)
+        #define SPDIF_INT_EOBLOCK       (1 << 2)
+        #define SPDIF_INT_EOLATENCY     (1 << 3)
+        #define SPDIF_INT_EOPD_DATA     (1 << 4)
+        #define SPDIF_INT_MEMFULLREAD   (1 << 5)
+        #define SPDIF_INT_EOPD_PAUSE    (1 << 6)
+
+#define SPDIF_OUT_INT_EN        0x10
+#define SPDIF_OUT_INT_EN_SET    0x14
+#define SPDIF_OUT_INT_EN_CLR    0x18
+#define SPDIF_OUT_CTRL          0x1C
+        #define SPDIF_OPMODE_MASK       (7 << 0)
+        #define SPDIF_OPMODE_OFF        (0 << 0)
+        #define SPDIF_OPMODE_MUTE_PCM   (1 << 0)
+        #define SPDIF_OPMODE_MUTE_PAUSE (2 << 0)
+        #define SPDIF_OPMODE_AUD_DATA   (3 << 0)
+        #define SPDIF_OPMODE_ENCODE     (4 << 0)
+        #define SPDIF_STATE_NORMAL      (1 << 3)
+        #define SPDIF_DIVIDER_MASK      (0xff << 5)
+        #define SPDIF_DIVIDER_SHIFT     (5)
+        #define SPDIF_SAMPLEREAD_MASK   (0x1ffff << 15)
+        #define SPDIF_SAMPLEREAD_SHIFT  (15)
+#define SPDIF_OUT_STA           0x20
+#define SPDIF_OUT_PA_PB         0x24
+#define SPDIF_OUT_PC_PD         0x28
+#define SPDIF_OUT_CL1           0x2C
+#define SPDIF_OUT_CR1           0x30
+#define SPDIF_OUT_CL2_CR2_UV    0x34
+#define SPDIF_OUT_PAUSE_LAT     0x38
+#define SPDIF_OUT_FRMLEN_BRST   0x3C
+#define SPDIF_OUT_CFG           0x40
+        #define SPDIF_OUT_MEMFMT_16_0   (0 << 5)
+        #define SPDIF_OUT_MEMFMT_16_16  (1 << 5)
+        #define SPDIF_OUT_VALID_DMA     (0 << 3)
+        #define SPDIF_OUT_VALID_HW      (1 << 3)
+        #define SPDIF_OUT_USER_DMA      (0 << 2)
+        #define SPDIF_OUT_USER_HW       (1 << 2)
+        #define SPDIF_OUT_CHNLSTA_DMA   (0 << 1)
+        #define SPDIF_OUT_CHNLSTA_HW    (1 << 1)
+        #define SPDIF_OUT_PARITY_HW     (0 << 0)
+        #define SPDIF_OUT_PARITY_DMA    (1 << 0)
+        #define SPDIF_OUT_FDMA_TRIG_2   (2 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_6   (6 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_8   (8 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_10  (10 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_12  (12 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_16  (16 << 8)
+        #define SPDIF_OUT_FDMA_TRIG_18  (18 << 8)
+
+#endif /* SPDIF_OUT_REGS_H */