ASoC: SAMSUNG: Add S/PDIF CPU driver

This patch adds S/PDIF CPU driver for various Samsung SoCs.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

4 files changed, 526 insertions, 0 deletions

diff --git a/sound/soc/s3c24xx/Kconfig b/sound/soc/s3c24xx/Kconfig
index 7d8235de549e..e2cba93446a5 100644
--- a/sound/soc/s3c24xx/Kconfig
+++ b/sound/soc/s3c24xx/Kconfig
@@ -36,6 +36,10 @@ config SND_S3C_SOC_AC97
         tristate
         select SND_SOC_AC97_BUS
 
+config SND_S5P_SOC_SPDIF
+        tristate
+        select SND_SOC_SPDIF
+
 config SND_S3C24XX_SOC_NEO1973_WM8753
         tristate "SoC I2S Audio support for NEO1973 - WM8753"
         depends on SND_S3C24XX_SOC && MACH_NEO1973_GTA01
diff --git a/sound/soc/s3c24xx/Makefile b/sound/soc/s3c24xx/Makefile
index dd412a9e88c3..0a02735716de 100644
--- a/sound/soc/s3c24xx/Makefile
+++ b/sound/soc/s3c24xx/Makefile
@@ -7,6 +7,7 @@ snd-soc-s3c-ac97-objs := s3c-ac97.o
 snd-soc-s3c64xx-i2s-v4-objs := s3c64xx-i2s-v4.o
 snd-soc-s3c-i2s-v2-objs := s3c-i2s-v2.o
 snd-soc-s3c-pcm-objs := s3c-pcm.o
+snd-soc-samsung-spdif-objs := spdif.o
 
 obj-$(CONFIG_SND_S3C24XX_SOC) += snd-soc-s3c24xx.o
 obj-$(CONFIG_SND_S3C24XX_SOC_I2S) += snd-soc-s3c24xx-i2s.o
@@ -16,6 +17,7 @@ obj-$(CONFIG_SND_S3C64XX_SOC_I2S) += snd-soc-s3c64xx-i2s.o
 obj-$(CONFIG_SND_S3C64XX_SOC_I2S_V4) += snd-soc-s3c64xx-i2s-v4.o
 obj-$(CONFIG_SND_S3C_I2SV2_SOC) += snd-soc-s3c-i2s-v2.o
 obj-$(CONFIG_SND_S3C_SOC_PCM) += snd-soc-s3c-pcm.o
+obj-$(CONFIG_SND_S5P_SOC_SPDIF) += snd-soc-samsung-spdif.o
 
 # S3C24XX Machine Support
 snd-soc-jive-wm8750-objs := jive_wm8750.o
diff --git a/sound/soc/s3c24xx/spdif.c b/sound/soc/s3c24xx/spdif.c
new file mode 100644
index 000000000000..ce554e9cabcc
--- /dev/null
+++ b/sound/soc/s3c24xx/spdif.c
@@ -0,0 +1,501 @@
+/* sound/soc/s3c24xx/spdif.c
+ *
+ * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
+ *
+ * Copyright (c) 2010 Samsung Electronics Co. Ltd
+ *              http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <plat/audio.h>
+#include <mach/dma.h>
+
+#include "s3c-dma.h"
+#include "spdif.h"
+
+/* Registers */
+#define CLKCON                          0x00
+#define CON                             0x04
+#define BSTAS                           0x08
+#define CSTAS                           0x0C
+#define DATA_OUTBUF                     0x10
+#define DCNT                            0x14
+#define BSTAS_S                         0x18
+#define DCNT_S                          0x1C
+
+#define CLKCTL_MASK                     0x7
+#define CLKCTL_MCLK_EXT                 (0x1 << 2)
+#define CLKCTL_PWR_ON                   (0x1 << 0)
+
+#define CON_MASK                        0x3ffffff
+#define CON_FIFO_TH_SHIFT               19
+#define CON_FIFO_TH_MASK                (0x7 << 19)
+#define CON_USERDATA_23RDBIT            (0x1 << 12)
+
+#define CON_SW_RESET                    (0x1 << 5)
+
+#define CON_MCLKDIV_MASK                (0x3 << 3)
+#define CON_MCLKDIV_256FS               (0x0 << 3)
+#define CON_MCLKDIV_384FS               (0x1 << 3)
+#define CON_MCLKDIV_512FS               (0x2 << 3)
+
+#define CON_PCM_MASK                    (0x3 << 1)
+#define CON_PCM_16BIT                   (0x0 << 1)
+#define CON_PCM_20BIT                   (0x1 << 1)
+#define CON_PCM_24BIT                   (0x2 << 1)
+
+#define CON_PCM_DATA                    (0x1 << 0)
+
+#define CSTAS_MASK                      0x3fffffff
+#define CSTAS_SAMP_FREQ_MASK            (0xF << 24)
+#define CSTAS_SAMP_FREQ_44              (0x0 << 24)
+#define CSTAS_SAMP_FREQ_48              (0x2 << 24)
+#define CSTAS_SAMP_FREQ_32              (0x3 << 24)
+#define CSTAS_SAMP_FREQ_96              (0xA << 24)
+
+#define CSTAS_CATEGORY_MASK             (0xFF << 8)
+#define CSTAS_CATEGORY_CODE_CDP         (0x01 << 8)
+
+#define CSTAS_NO_COPYRIGHT              (0x1 << 2)
+
+/**
+ * struct samsung_spdif_info - Samsung S/PDIF Controller information
+ * @lock: Spin lock for S/PDIF.
+ * @dev: The parent device passed to use from the probe.
+ * @regs: The pointer to the device register block.
+ * @clk_rate: Current clock rate for calcurate ratio.
+ * @pclk: The peri-clock pointer for spdif master operation.
+ * @sclk: The source clock pointer for making sync signals.
+ * @save_clkcon: Backup clkcon reg. in suspend.
+ * @save_con: Backup con reg. in suspend.
+ * @save_cstas: Backup cstas reg. in suspend.
+ * @dma_playback: DMA information for playback channel.
+ */
+struct samsung_spdif_info {
+        spinlock_t      lock;
+        struct device   *dev;
+        void __iomem    *regs;
+        unsigned long   clk_rate;
+        struct clk      *pclk;
+        struct clk      *sclk;
+        u32             saved_clkcon;
+        u32             saved_con;
+        u32             saved_cstas;
+        struct s3c_dma_params   *dma_playback;
+};
+
+static struct s3c2410_dma_client spdif_dma_client_out = {
+        .name           = "S/PDIF Stereo out",
+};
+
+static struct s3c_dma_params spdif_stereo_out;
+static struct samsung_spdif_info spdif_info;
+
+static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
+{
+        return snd_soc_dai_get_drvdata(cpu_dai);
+}
+
+static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
+{
+        void __iomem *regs = spdif->regs;
+        u32 clkcon;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+        if (on)
+                writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
+        else
+                writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
+}
+
+static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
+                                int clk_id, unsigned int freq, int dir)
+{
+        struct samsung_spdif_info *spdif = to_info(cpu_dai);
+        u32 clkcon;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        clkcon = readl(spdif->regs + CLKCON);
+
+        if (clk_id == SND_SOC_SPDIF_INT_MCLK)
+                clkcon &= ~CLKCTL_MCLK_EXT;
+        else
+                clkcon |= CLKCTL_MCLK_EXT;
+
+        writel(clkcon, spdif->regs + CLKCON);
+
+        spdif->clk_rate = freq;
+
+        return 0;
+}
+
+static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+                                struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+        unsigned long flags;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                spin_lock_irqsave(&spdif->lock, flags);
+                spdif_snd_txctrl(spdif, 1);
+                spin_unlock_irqrestore(&spdif->lock, flags);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                spin_lock_irqsave(&spdif->lock, flags);
+                spdif_snd_txctrl(spdif, 0);
+                spin_unlock_irqrestore(&spdif->lock, flags);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int spdif_sysclk_ratios[] = {
+        512, 384, 256,
+};
+
+static int spdif_hw_params(struct snd_pcm_substream *substream,
+                                struct snd_pcm_hw_params *params,
+                                struct snd_soc_dai *socdai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+        void __iomem *regs = spdif->regs;
+        struct s3c_dma_params *dma_data;
+        u32 con, clkcon, cstas;
+        unsigned long flags;
+        int i, ratio;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                dma_data = spdif->dma_playback;
+        else {
+                dev_err(spdif->dev, "Capture is not supported\n");
+                return -EINVAL;
+        }
+
+        snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
+
+        spin_lock_irqsave(&spdif->lock, flags);
+
+        con = readl(regs + CON) & CON_MASK;
+        cstas = readl(regs + CSTAS) & CSTAS_MASK;
+        clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+
+        con &= ~CON_FIFO_TH_MASK;
+        con |= (0x7 << CON_FIFO_TH_SHIFT);
+        con |= CON_USERDATA_23RDBIT;
+        con |= CON_PCM_DATA;
+
+        con &= ~CON_PCM_MASK;
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                con |= CON_PCM_16BIT;
+                break;
+        default:
+                dev_err(spdif->dev, "Unsupported data size.\n");
+                goto err;
+        }
+
+        ratio = spdif->clk_rate / params_rate(params);
+        for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
+                if (ratio == spdif_sysclk_ratios[i])
+                        break;
+        if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
+                dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
+                                spdif->clk_rate, params_rate(params));
+                goto err;
+        }
+
+        con &= ~CON_MCLKDIV_MASK;
+        switch (ratio) {
+        case 256:
+                con |= CON_MCLKDIV_256FS;
+                break;
+        case 384:
+                con |= CON_MCLKDIV_384FS;
+                break;
+        case 512:
+                con |= CON_MCLKDIV_512FS;
+                break;
+        }
+
+        cstas &= ~CSTAS_SAMP_FREQ_MASK;
+        switch (params_rate(params)) {
+        case 44100:
+                cstas |= CSTAS_SAMP_FREQ_44;
+                break;
+        case 48000:
+                cstas |= CSTAS_SAMP_FREQ_48;
+                break;
+        case 32000:
+                cstas |= CSTAS_SAMP_FREQ_32;
+                break;
+        case 96000:
+                cstas |= CSTAS_SAMP_FREQ_96;
+                break;
+        default:
+                dev_err(spdif->dev, "Invalid sampling rate %d\n",
+                                params_rate(params));
+                goto err;
+        }
+
+        cstas &= ~CSTAS_CATEGORY_MASK;
+        cstas |= CSTAS_CATEGORY_CODE_CDP;
+        cstas |= CSTAS_NO_COPYRIGHT;
+
+        writel(con, regs + CON);
+        writel(cstas, regs + CSTAS);
+        writel(clkcon, regs + CLKCON);
+
+        spin_unlock_irqrestore(&spdif->lock, flags);
+
+        return 0;
+err:
+        spin_unlock_irqrestore(&spdif->lock, flags);
+        return -EINVAL;
+}
+
+static void spdif_shutdown(struct snd_pcm_substream *substream,
+                                struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
+        void __iomem *regs = spdif->regs;
+        u32 con, clkcon;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        con = readl(regs + CON) & CON_MASK;
+        clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
+
+        writel(con | CON_SW_RESET, regs + CON);
+        cpu_relax();
+
+        writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
+}
+
+#ifdef CONFIG_PM
+static int spdif_suspend(struct snd_soc_dai *cpu_dai)
+{
+        struct samsung_spdif_info *spdif = to_info(cpu_dai);
+        u32 con = spdif->saved_con;
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
+        spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
+        spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
+
+        writel(con | CON_SW_RESET, spdif->regs + CON);
+        cpu_relax();
+
+        return 0;
+}
+
+static int spdif_resume(struct snd_soc_dai *cpu_dai)
+{
+        struct samsung_spdif_info *spdif = to_info(cpu_dai);
+
+        dev_dbg(spdif->dev, "Entered %s\n", __func__);
+
+        writel(spdif->saved_clkcon, spdif->regs + CLKCON);
+        writel(spdif->saved_con, spdif->regs + CON);
+        writel(spdif->saved_cstas, spdif->regs + CSTAS);
+
+        return 0;
+}
+#else
+#define spdif_suspend NULL
+#define spdif_resume NULL
+#endif
+
+static struct snd_soc_dai_ops spdif_dai_ops = {
+        .set_sysclk     = spdif_set_sysclk,
+        .trigger        = spdif_trigger,
+        .hw_params      = spdif_hw_params,
+        .shutdown       = spdif_shutdown,
+};
+
+struct snd_soc_dai_driver samsung_spdif_dai = {
+        .name = "samsung-spdif",
+        .playback = {
+                .stream_name = "S/PDIF Playback",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = (SNDRV_PCM_RATE_32000 |
+                                SNDRV_PCM_RATE_44100 |
+                                SNDRV_PCM_RATE_48000 |
+                                SNDRV_PCM_RATE_96000),
+                .formats = SNDRV_PCM_FMTBIT_S16_LE, },
+        .ops = &spdif_dai_ops,
+        .suspend = spdif_suspend,
+        .resume = spdif_resume,
+};
+
+static __devinit int spdif_probe(struct platform_device *pdev)
+{
+        struct s3c_audio_pdata *spdif_pdata;
+        struct resource *mem_res, *dma_res;
+        struct samsung_spdif_info *spdif;
+        int ret;
+
+        spdif_pdata = pdev->dev.platform_data;
+
+        dev_dbg(&pdev->dev, "Entered %s\n", __func__);
+
+        dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (!dma_res) {
+                dev_err(&pdev->dev, "Unable to get dma resource.\n");
+                return -ENXIO;
+        }
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res) {
+                dev_err(&pdev->dev, "Unable to get register resource.\n");
+                return -ENXIO;
+        }
+
+        if (spdif_pdata && spdif_pdata->cfg_gpio
+                        && spdif_pdata->cfg_gpio(pdev)) {
+                dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
+                return -EINVAL;
+        }
+
+        spdif = &spdif_info;
+        spdif->dev = &pdev->dev;
+
+        spin_lock_init(&spdif->lock);
+
+        spdif->pclk = clk_get(&pdev->dev, "spdif");
+        if (IS_ERR(spdif->pclk)) {
+                dev_err(&pdev->dev, "failed to get peri-clock\n");
+                ret = -ENOENT;
+                goto err0;
+        }
+        clk_enable(spdif->pclk);
+
+        spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
+        if (IS_ERR(spdif->sclk)) {
+                dev_err(&pdev->dev, "failed to get internal source clock\n");
+                ret = -ENOENT;
+                goto err1;
+        }
+        clk_enable(spdif->sclk);
+
+        /* Request S/PDIF Register's memory region */
+        if (!request_mem_region(mem_res->start,
+                                resource_size(mem_res), "samsung-spdif")) {
+                dev_err(&pdev->dev, "Unable to request register region\n");
+                ret = -EBUSY;
+                goto err2;
+        }
+
+        spdif->regs = ioremap(mem_res->start, 0x100);
+        if (spdif->regs == NULL) {
+                dev_err(&pdev->dev, "Cannot ioremap registers\n");
+                ret = -ENXIO;
+                goto err3;
+        }
+
+        dev_set_drvdata(&pdev->dev, spdif);
+
+        ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "fail to register dai\n");
+                goto err4;
+        }
+
+        spdif_stereo_out.dma_size = 2;
+        spdif_stereo_out.client = &spdif_dma_client_out;
+        spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
+        spdif_stereo_out.channel = dma_res->start;
+
+        spdif->dma_playback = &spdif_stereo_out;
+
+        return 0;
+
+err4:
+        iounmap(spdif->regs);
+err3:
+        release_mem_region(mem_res->start, resource_size(mem_res));
+err2:
+        clk_disable(spdif->sclk);
+        clk_put(spdif->sclk);
+err1:
+        clk_disable(spdif->pclk);
+        clk_put(spdif->pclk);
+err0:
+        return ret;
+}
+
+static __devexit int spdif_remove(struct platform_device *pdev)
+{
+        struct samsung_spdif_info *spdif = &spdif_info;
+        struct resource *mem_res;
+
+        snd_soc_unregister_dai(&pdev->dev);
+
+        iounmap(spdif->regs);
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (mem_res)
+                release_mem_region(mem_res->start, resource_size(mem_res));
+
+        clk_disable(spdif->sclk);
+        clk_put(spdif->sclk);
+        clk_disable(spdif->pclk);
+        clk_put(spdif->pclk);
+
+        return 0;
+}
+
+static struct platform_driver samsung_spdif_driver = {
+        .probe  = spdif_probe,
+        .remove = spdif_remove,
+        .driver = {
+                .name   = "samsung-spdif",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init spdif_init(void)
+{
+        return platform_driver_register(&samsung_spdif_driver);
+}
+module_init(spdif_init);
+
+static void __exit spdif_exit(void)
+{
+        platform_driver_unregister(&samsung_spdif_driver);
+}
+module_exit(spdif_exit);
+
+MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
+MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:samsung-spdif");
diff --git a/sound/soc/s3c24xx/spdif.h b/sound/soc/s3c24xx/spdif.h
new file mode 100644
index 000000000000..3ed55592710f
--- /dev/null
+++ b/sound/soc/s3c24xx/spdif.h
@@ -0,0 +1,19 @@
+/* sound/soc/s3c24xx/spdif.h
+ *
+ * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
+ *
+ * Copyright (c) 2010 Samsung Electronics Co. Ltd
+ *              http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __SND_SOC_SAMSUNG_SPDIF_H
+#define __SND_SOC_SAMSUNG_SPDIF_H       __FILE__
+
+#define SND_SOC_SPDIF_INT_MCLK          0
+#define SND_SOC_SPDIF_EXT_MCLK          1
+
+#endif  /* __SND_SOC_SAMSUNG_SPDIF_H */