ASoC: rockchip: Add rockchip SPDIF transceiver driver

Add a driver for the SPDIF transceiver available on RK3066, RK3188 and
RK3288. Heavily based on the rockchip i2s driver.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>

4 files changed, 482 insertions, 0 deletions

diff --git a/sound/soc/rockchip/Kconfig b/sound/soc/rockchip/Kconfig
index 570905709d3a..f1e0c703e0d2 100644
--- a/sound/soc/rockchip/Kconfig
+++ b/sound/soc/rockchip/Kconfig
@@ -15,6 +15,14 @@ config SND_SOC_ROCKCHIP_I2S
           Rockchip I2S device. The device supports upto maximum of
           8 channels each for play and record.
 
+config SND_SOC_ROCKCHIP_SPDIF
+        tristate "Rockchip SPDIF Device Driver"
+        depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP
+        select SND_SOC_GENERIC_DMAENGINE_PCM
+        help
+          Say Y or M if you want to add support for SPDIF driver for
+          Rockchip SPDIF transceiver device.
+
 config SND_SOC_ROCKCHIP_MAX98090
         tristate "ASoC support for Rockchip boards using a MAX98090 codec"
         depends on SND_SOC_ROCKCHIP && I2C && GPIOLIB && CLKDEV_LOOKUP
diff --git a/sound/soc/rockchip/Makefile b/sound/soc/rockchip/Makefile
index e9ba55842879..c0bf560125f3 100644
--- a/sound/soc/rockchip/Makefile
+++ b/sound/soc/rockchip/Makefile
@@ -1,7 +1,9 @@
 # ROCKCHIP Platform Support
 snd-soc-rockchip-i2s-objs := rockchip_i2s.o
+snd-soc-rockchip-spdif-objs := rockchip_spdif.o
 
 obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
+obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 
 snd-soc-rockchip-max98090-objs := rockchip_max98090.o
 snd-soc-rockchip-rt5645-objs := rockchip_rt5645.o
diff --git a/sound/soc/rockchip/rockchip_spdif.c b/sound/soc/rockchip/rockchip_spdif.c
new file mode 100644
index 000000000000..9d5c470cee82
--- /dev/null
+++ b/sound/soc/rockchip/rockchip_spdif.c
@@ -0,0 +1,409 @@
+/* sound/soc/rockchip/rk_spdif.c
+ *
+ * ALSA SoC Audio Layer - Rockchip I2S Controller driver
+ *
+ * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
+ * Author: Jianqun <jay.xu@rock-chips.com>
+ * Copyright (c) 2015 Collabora Ltd.
+ * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
+ *
+ * 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/module.h>
+#include <linux/delay.h>
+#include <linux/of_gpio.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <sound/pcm_params.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "rockchip_spdif.h"
+
+enum rk_spdif_type {
+        RK_SPDIF_RK3066,
+        RK_SPDIF_RK3188,
+        RK_SPDIF_RK3288,
+};
+
+#define RK3288_GRF_SOC_CON2 0x24c
+
+struct rk_spdif_dev {
+        struct device *dev;
+
+        struct clk *mclk;
+        struct clk *hclk;
+
+        struct snd_dmaengine_dai_dma_data playback_dma_data;
+
+        struct regmap *regmap;
+};
+
+static const struct of_device_id rk_spdif_match[] = {
+        { .compatible = "rockchip,rk3066-spdif",
+          .data = (void *) RK_SPDIF_RK3066 },
+        { .compatible = "rockchip,rk3188-spdif",
+          .data = (void *) RK_SPDIF_RK3188 },
+        { .compatible = "rockchip,rk3288-spdif",
+          .data = (void *) RK_SPDIF_RK3288 },
+        {},
+};
+MODULE_DEVICE_TABLE(of, rk_spdif_match);
+
+static int rk_spdif_runtime_suspend(struct device *dev)
+{
+        struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
+
+        clk_disable_unprepare(spdif->mclk);
+        clk_disable_unprepare(spdif->hclk);
+
+        return 0;
+}
+
+static int rk_spdif_runtime_resume(struct device *dev)
+{
+        struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
+        int ret;
+
+        ret = clk_prepare_enable(spdif->mclk);
+        if (ret) {
+                dev_err(spdif->dev, "mclk clock enable failed %d\n", ret);
+                return ret;
+        }
+
+        ret = clk_prepare_enable(spdif->hclk);
+        if (ret) {
+                dev_err(spdif->dev, "hclk clock enable failed %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static int rk_spdif_hw_params(struct snd_pcm_substream *substream,
+                                  struct snd_pcm_hw_params *params,
+                                  struct snd_soc_dai *dai)
+{
+        struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+        unsigned int val = SPDIF_CFGR_HALFWORD_ENABLE;
+        int srate, mclk;
+        int ret;
+
+        srate = params_rate(params);
+        switch (srate) {
+        case 32000:
+        case 48000:
+        case 96000:
+                mclk = 96000 * 128; /* 12288000 hz */
+                break;
+        case 44100:
+                mclk = 44100 * 256; /* 11289600 hz */
+                break;
+        case 192000:
+                mclk = 192000 * 128; /* 24576000 hz */
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                val |= SPDIF_CFGR_VDW_16;
+                break;
+        case SNDRV_PCM_FORMAT_S20_3LE:
+                val |= SPDIF_CFGR_VDW_20;
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                val |= SPDIF_CFGR_VDW_24;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* Set clock and calculate divider */
+        ret = clk_set_rate(spdif->mclk, mclk);
+        if (ret != 0) {
+                dev_err(spdif->dev, "Failed to set module clock rate: %d\n",
+                        ret);
+                return ret;
+        }
+
+        val |= SPDIF_CFGR_CLK_DIV(mclk/(srate * 256));
+        ret = regmap_update_bits(spdif->regmap, SPDIF_CFGR,
+                SPDIF_CFGR_CLK_DIV_MASK | SPDIF_CFGR_HALFWORD_ENABLE |
+                SDPIF_CFGR_VDW_MASK,
+                val);
+
+        return ret;
+}
+
+static int rk_spdif_trigger(struct snd_pcm_substream *substream,
+                                int cmd, struct snd_soc_dai *dai)
+{
+        struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+        int ret;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
+                                   SPDIF_DMACR_TDE_ENABLE,
+                                   SPDIF_DMACR_TDE_ENABLE);
+
+                if (ret != 0)
+                        return ret;
+
+                ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
+                                   SPDIF_XFER_TXS_START,
+                                   SPDIF_XFER_TXS_START);
+                break;
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                ret = regmap_update_bits(spdif->regmap, SPDIF_DMACR,
+                                   SPDIF_DMACR_TDE_ENABLE,
+                                   SPDIF_DMACR_TDE_DISABLE);
+
+                if (ret != 0)
+                        return ret;
+
+                ret = regmap_update_bits(spdif->regmap, SPDIF_XFER,
+                                   SPDIF_XFER_TXS_START,
+                                   SPDIF_XFER_TXS_STOP);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static int rk_spdif_dai_probe(struct snd_soc_dai *dai)
+{
+        struct rk_spdif_dev *spdif = snd_soc_dai_get_drvdata(dai);
+
+        dai->playback_dma_data = &spdif->playback_dma_data;
+
+        return 0;
+}
+
+static const struct snd_soc_dai_ops rk_spdif_dai_ops = {
+        .hw_params = rk_spdif_hw_params,
+        .trigger = rk_spdif_trigger,
+};
+
+static struct snd_soc_dai_driver rk_spdif_dai = {
+        .probe = rk_spdif_dai_probe,
+        .playback = {
+                .stream_name = "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 |
+                            SNDRV_PCM_FMTBIT_S20_3LE |
+                            SNDRV_PCM_FMTBIT_S24_LE),
+        },
+        .ops = &rk_spdif_dai_ops,
+};
+
+static const struct snd_soc_component_driver rk_spdif_component = {
+        .name = "rockchip-spdif",
+};
+
+static bool rk_spdif_wr_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SPDIF_CFGR:
+        case SPDIF_DMACR:
+        case SPDIF_INTCR:
+        case SPDIF_XFER:
+        case SPDIF_SMPDR:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool rk_spdif_rd_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SPDIF_CFGR:
+        case SPDIF_SDBLR:
+        case SPDIF_INTCR:
+        case SPDIF_INTSR:
+        case SPDIF_XFER:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static bool rk_spdif_volatile_reg(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SPDIF_INTSR:
+        case SPDIF_SDBLR:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static const struct regmap_config rk_spdif_regmap_config = {
+        .reg_bits = 32,
+        .reg_stride = 4,
+        .val_bits = 32,
+        .max_register = SPDIF_SMPDR,
+        .writeable_reg = rk_spdif_wr_reg,
+        .readable_reg = rk_spdif_rd_reg,
+        .volatile_reg = rk_spdif_volatile_reg,
+        .cache_type = REGCACHE_FLAT,
+};
+
+static int rk_spdif_probe(struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        struct rk_spdif_dev *spdif;
+        const struct of_device_id *match;
+        struct resource *res;
+        void __iomem *regs;
+        int ret;
+
+        match = of_match_node(rk_spdif_match, np);
+        if ((int) match->data == RK_SPDIF_RK3288) {
+                struct regmap *grf;
+
+                grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+                if (IS_ERR(grf)) {
+                        dev_err(&pdev->dev,
+                                "rockchip_spdif missing 'rockchip,grf' \n");
+                        return PTR_ERR(grf);
+                }
+
+                /* Select the 8 channel SPDIF solution on RK3288 as
+                 * the 2 channel one does not appear to work
+                 */
+                regmap_write(grf, RK3288_GRF_SOC_CON2, BIT(1) << 16);
+        }
+
+        spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
+        if (!spdif)
+                return -ENOMEM;
+
+        spdif->hclk = devm_clk_get(&pdev->dev, "hclk");
+        if (IS_ERR(spdif->hclk)) {
+                dev_err(&pdev->dev, "Can't retrieve rk_spdif bus clock\n");
+                return PTR_ERR(spdif->hclk);
+        }
+        ret = clk_prepare_enable(spdif->hclk);
+        if (ret) {
+                dev_err(spdif->dev, "hclock enable failed %d\n", ret);
+                return ret;
+        }
+
+        spdif->mclk = devm_clk_get(&pdev->dev, "mclk");
+        if (IS_ERR(spdif->mclk)) {
+                dev_err(&pdev->dev, "Can't retrieve rk_spdif master clock\n");
+                return PTR_ERR(spdif->mclk);
+        }
+
+        ret = clk_prepare_enable(spdif->mclk);
+        if (ret) {
+                dev_err(spdif->dev, "clock enable failed %d\n", ret);
+                return ret;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        regs = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(regs))
+                return PTR_ERR(regs);
+
+        spdif->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "hclk", regs,
+                                                  &rk_spdif_regmap_config);
+        if (IS_ERR(spdif->regmap)) {
+                dev_err(&pdev->dev,
+                        "Failed to initialise managed register map\n");
+                return PTR_ERR(spdif->regmap);
+        }
+
+        spdif->playback_dma_data.addr = res->start + SPDIF_SMPDR;
+        spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+        spdif->playback_dma_data.maxburst = 4;
+
+        spdif->dev = &pdev->dev;
+        dev_set_drvdata(&pdev->dev, spdif);
+
+        pm_runtime_set_active(&pdev->dev);
+        pm_runtime_enable(&pdev->dev);
+        pm_request_idle(&pdev->dev);
+
+        ret = devm_snd_soc_register_component(&pdev->dev,
+                                              &rk_spdif_component,
+                                              &rk_spdif_dai, 1);
+        if (ret) {
+                dev_err(&pdev->dev, "Could not register DAI\n");
+                goto err_pm_runtime;
+        }
+
+        ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+        if (ret) {
+                dev_err(&pdev->dev, "Could not register PCM\n");
+                goto err_pcm_register;
+        }
+
+        return 0;
+
+err_pcm_register:
+        snd_dmaengine_pcm_unregister(&pdev->dev);
+err_pm_runtime:
+        pm_runtime_disable(&pdev->dev);
+
+        return ret;
+}
+
+static int rk_spdif_remove(struct platform_device *pdev)
+{
+        struct rk_spdif_dev *spdif = dev_get_drvdata(&pdev->dev);
+
+        pm_runtime_disable(&pdev->dev);
+        if (!pm_runtime_status_suspended(&pdev->dev))
+                rk_spdif_runtime_suspend(&pdev->dev);
+
+        clk_disable_unprepare(spdif->mclk);
+        clk_disable_unprepare(spdif->hclk);
+        snd_dmaengine_pcm_unregister(&pdev->dev);
+        snd_soc_unregister_component(&pdev->dev);
+
+        return 0;
+}
+
+static const struct dev_pm_ops rk_spdif_pm_ops = {
+        SET_RUNTIME_PM_OPS(rk_spdif_runtime_suspend, rk_spdif_runtime_resume,
+                           NULL)
+};
+
+static struct platform_driver rk_spdif_driver = {
+        .probe = rk_spdif_probe,
+        .remove = rk_spdif_remove,
+        .driver = {
+                .name = "rockchip-spdif",
+                .of_match_table = of_match_ptr(rk_spdif_match),
+                .pm = &rk_spdif_pm_ops,
+        },
+};
+module_platform_driver(rk_spdif_driver);
+
+MODULE_ALIAS("platform:rockchip-spdif");
+MODULE_DESCRIPTION("ROCKCHIP SPDIF transceiver Interface");
+MODULE_AUTHOR("Sjoerd Simons <sjoerd.simons@collabora.co.uk>");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/rockchip/rockchip_spdif.h b/sound/soc/rockchip/rockchip_spdif.h
new file mode 100644
index 000000000000..07f86a21046a
--- /dev/null
+++ b/sound/soc/rockchip/rockchip_spdif.h
@@ -0,0 +1,63 @@
+/*
+ * ALSA SoC Audio Layer - Rockchip SPDIF transceiver driver
+ *
+ * Copyright (c) 2015 Collabora Ltd.
+ * Author: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
+ *
+ * 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 _ROCKCHIP_SPDIF_H
+#define _ROCKCHIP_SPDIF_H
+
+/*
+ * CFGR
+ * transfer configuration register
+*/
+#define SPDIF_CFGR_CLK_DIV_SHIFT        (16)
+#define SPDIF_CFGR_CLK_DIV_MASK         (0xff << SPDIF_CFGR_CLK_DIV_SHIFT)
+#define SPDIF_CFGR_CLK_DIV(x)           (x << SPDIF_CFGR_CLK_DIV_SHIFT)
+
+#define SPDIF_CFGR_HALFWORD_SHIFT       2
+#define SPDIF_CFGR_HALFWORD_DISABLE     (0 << SPDIF_CFGR_HALFWORD_SHIFT)
+#define SPDIF_CFGR_HALFWORD_ENABLE      (1 << SPDIF_CFGR_HALFWORD_SHIFT)
+
+#define SPDIF_CFGR_VDW_SHIFT    0
+#define SPDIF_CFGR_VDW(x)       (x << SPDIF_CFGR_VDW_SHIFT)
+#define SDPIF_CFGR_VDW_MASK     (0xf << SPDIF_CFGR_VDW_SHIFT)
+
+#define SPDIF_CFGR_VDW_16       SPDIF_CFGR_VDW(0x00)
+#define SPDIF_CFGR_VDW_20       SPDIF_CFGR_VDW(0x01)
+#define SPDIF_CFGR_VDW_24       SPDIF_CFGR_VDW(0x10)
+
+/*
+ * DMACR
+ * DMA control register
+*/
+#define SPDIF_DMACR_TDE_SHIFT   5
+#define SPDIF_DMACR_TDE_DISABLE (0 << SPDIF_DMACR_TDE_SHIFT)
+#define SPDIF_DMACR_TDE_ENABLE  (1 << SPDIF_DMACR_TDE_SHIFT)
+
+#define SPDIF_DMACR_TDL_SHIFT   0
+#define SPDIF_DMACR_TDL(x)      ((x) << SPDIF_DMACR_TDL_SHIFT)
+#define SPDIF_DMACR_TDL_MASK    (0x1f << SDPIF_DMACR_TDL_SHIFT)
+
+/*
+ * XFER
+ * Transfer control register
+*/
+#define SPDIF_XFER_TXS_SHIFT    0
+#define SPDIF_XFER_TXS_STOP     (0 << SPDIF_XFER_TXS_SHIFT)
+#define SPDIF_XFER_TXS_START    (1 << SPDIF_XFER_TXS_SHIFT)
+
+#define SPDIF_CFGR      (0x0000)
+#define SPDIF_SDBLR     (0x0004)
+#define SPDIF_DMACR     (0x0008)
+#define SPDIF_INTCR     (0x000c)
+#define SPDIF_INTSR     (0x0010)
+#define SPDIF_XFER      (0x0018)
+#define SPDIF_SMPDR     (0x0020)
+
+#endif /* _ROCKCHIP_SPDIF_H */