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>
diff --git a/sound/soc/rockchip/rockchip_spdif.c b/sound/soc/rockchip/rockchip_spdif.c
new file mode 100644
index 0000000..9d5c470
--- /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");