1 files changed, 314 insertions, 0 deletions

diff --git a/sound/soc/fsl/fsl_aud2htx.c b/sound/soc/fsl/fsl_aud2htx.c
new file mode 100644
index 000000000..1e421d9a0
--- /dev/null
+++ b/sound/soc/fsl/fsl_aud2htx.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2020 NXP
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/pm_qos.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <linux/dma-mapping.h>
+
+#include "fsl_aud2htx.h"
+#include "imx-pcm.h"
+
+static int fsl_aud2htx_trigger(struct snd_pcm_substream *substream, int cmd,
+			       struct snd_soc_dai *dai)
+{
+	struct fsl_aud2htx *aud2htx = snd_soc_dai_get_drvdata(dai);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL,
+				   AUD2HTX_CTRL_EN, AUD2HTX_CTRL_EN);
+		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
+				   AUD2HTX_CTRE_DE, AUD2HTX_CTRE_DE);
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
+				   AUD2HTX_CTRE_DE, 0);
+		regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL,
+				   AUD2HTX_CTRL_EN, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct snd_soc_dai_ops fsl_aud2htx_dai_ops = {
+	.trigger	= fsl_aud2htx_trigger,
+};
+
+static int fsl_aud2htx_dai_probe(struct snd_soc_dai *cpu_dai)
+{
+	struct fsl_aud2htx *aud2htx = dev_get_drvdata(cpu_dai->dev);
+
+	/* DMA request when number of entries < WTMK_LOW */
+	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
+			   AUD2HTX_CTRE_DT_MASK, 0);
+
+	/* Disable interrupts*/
+	regmap_update_bits(aud2htx->regmap, AUD2HTX_IRQ_MASK,
+			   AUD2HTX_WM_HIGH_IRQ_MASK |
+			   AUD2HTX_WM_LOW_IRQ_MASK |
+			   AUD2HTX_OVF_MASK,
+			   AUD2HTX_WM_HIGH_IRQ_MASK |
+			   AUD2HTX_WM_LOW_IRQ_MASK |
+			   AUD2HTX_OVF_MASK);
+
+	/* Configure watermark */
+	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
+			   AUD2HTX_CTRE_WL_MASK,
+			   AUD2HTX_WTMK_LOW << AUD2HTX_CTRE_WL_SHIFT);
+	regmap_update_bits(aud2htx->regmap, AUD2HTX_CTRL_EXT,
+			   AUD2HTX_CTRE_WH_MASK,
+			   AUD2HTX_WTMK_HIGH << AUD2HTX_CTRE_WH_SHIFT);
+
+	snd_soc_dai_init_dma_data(cpu_dai, &aud2htx->dma_params_tx,
+				  &aud2htx->dma_params_rx);
+
+	return 0;
+}
+
+static struct snd_soc_dai_driver fsl_aud2htx_dai = {
+	.probe = fsl_aud2htx_dai_probe,
+	.playback = {
+		.stream_name = "CPU-Playback",
+		.channels_min = 1,
+		.channels_max = 8,
+		.rates = SNDRV_PCM_RATE_32000 |
+			 SNDRV_PCM_RATE_44100 |
+			 SNDRV_PCM_RATE_48000 |
+			 SNDRV_PCM_RATE_88200 |
+			 SNDRV_PCM_RATE_96000 |
+			 SNDRV_PCM_RATE_176400 |
+			 SNDRV_PCM_RATE_192000,
+		.formats = FSL_AUD2HTX_FORMATS,
+	},
+	.ops = &fsl_aud2htx_dai_ops,
+};
+
+static const struct snd_soc_component_driver fsl_aud2htx_component = {
+	.name			= "fsl-aud2htx",
+	.legacy_dai_naming	= 1,
+};
+
+static const struct reg_default fsl_aud2htx_reg_defaults[] = {
+	{AUD2HTX_CTRL,		0x00000000},
+	{AUD2HTX_CTRL_EXT,	0x00000000},
+	{AUD2HTX_WR,		0x00000000},
+	{AUD2HTX_STATUS,	0x00000000},
+	{AUD2HTX_IRQ_NOMASK,	0x00000000},
+	{AUD2HTX_IRQ_MASKED,	0x00000000},
+	{AUD2HTX_IRQ_MASK,	0x00000000},
+};
+
+static bool fsl_aud2htx_readable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AUD2HTX_CTRL:
+	case AUD2HTX_CTRL_EXT:
+	case AUD2HTX_STATUS:
+	case AUD2HTX_IRQ_NOMASK:
+	case AUD2HTX_IRQ_MASKED:
+	case AUD2HTX_IRQ_MASK:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool fsl_aud2htx_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AUD2HTX_CTRL:
+	case AUD2HTX_CTRL_EXT:
+	case AUD2HTX_WR:
+	case AUD2HTX_IRQ_NOMASK:
+	case AUD2HTX_IRQ_MASKED:
+	case AUD2HTX_IRQ_MASK:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool fsl_aud2htx_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case AUD2HTX_STATUS:
+	case AUD2HTX_IRQ_NOMASK:
+	case AUD2HTX_IRQ_MASKED:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config fsl_aud2htx_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+
+	.max_register = AUD2HTX_IRQ_MASK,
+	.reg_defaults = fsl_aud2htx_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(fsl_aud2htx_reg_defaults),
+	.readable_reg = fsl_aud2htx_readable_reg,
+	.volatile_reg = fsl_aud2htx_volatile_reg,
+	.writeable_reg = fsl_aud2htx_writeable_reg,
+	.cache_type = REGCACHE_RBTREE,
+};
+
+static const struct of_device_id fsl_aud2htx_dt_ids[] = {
+	{ .compatible = "fsl,imx8mp-aud2htx",},
+	{}
+};
+MODULE_DEVICE_TABLE(of, fsl_aud2htx_dt_ids);
+
+static irqreturn_t fsl_aud2htx_isr(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static int fsl_aud2htx_probe(struct platform_device *pdev)
+{
+	struct fsl_aud2htx *aud2htx;
+	struct resource *res;
+	void __iomem *regs;
+	int ret, irq;
+
+	aud2htx = devm_kzalloc(&pdev->dev, sizeof(*aud2htx), GFP_KERNEL);
+	if (!aud2htx)
+		return -ENOMEM;
+
+	aud2htx->pdev = pdev;
+
+	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	aud2htx->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+						&fsl_aud2htx_regmap_config);
+	if (IS_ERR(aud2htx->regmap)) {
+		dev_err(&pdev->dev, "failed to init regmap");
+		return PTR_ERR(aud2htx->regmap);
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(&pdev->dev, irq, fsl_aud2htx_isr, 0,
+			       dev_name(&pdev->dev), aud2htx);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to claim irq %u: %d\n", irq, ret);
+		return ret;
+	}
+
+	aud2htx->bus_clk = devm_clk_get(&pdev->dev, "bus");
+	if (IS_ERR(aud2htx->bus_clk)) {
+		dev_err(&pdev->dev, "failed to get mem clock\n");
+		return PTR_ERR(aud2htx->bus_clk);
+	}
+
+	aud2htx->dma_params_tx.chan_name = "tx";
+	aud2htx->dma_params_tx.maxburst = AUD2HTX_MAXBURST;
+	aud2htx->dma_params_tx.addr = res->start + AUD2HTX_WR;
+
+	platform_set_drvdata(pdev, aud2htx);
+	pm_runtime_enable(&pdev->dev);
+
+	regcache_cache_only(aud2htx->regmap, true);
+
+	/*
+	 * Register platform component before registering cpu dai for there
+	 * is not defer probe for platform component in snd_soc_add_pcm_runtime().
+	 */
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to pcm register\n");
+		pm_runtime_disable(&pdev->dev);
+		return ret;
+	}
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+					      &fsl_aud2htx_component,
+					      &fsl_aud2htx_dai, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register ASoC DAI\n");
+		pm_runtime_disable(&pdev->dev);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int fsl_aud2htx_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static int __maybe_unused fsl_aud2htx_runtime_suspend(struct device *dev)
+{
+	struct fsl_aud2htx *aud2htx = dev_get_drvdata(dev);
+
+	regcache_cache_only(aud2htx->regmap, true);
+	clk_disable_unprepare(aud2htx->bus_clk);
+
+	return 0;
+}
+
+static int __maybe_unused fsl_aud2htx_runtime_resume(struct device *dev)
+{
+	struct fsl_aud2htx *aud2htx = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(aud2htx->bus_clk);
+	if (ret)
+		return ret;
+
+	regcache_cache_only(aud2htx->regmap, false);
+	regcache_mark_dirty(aud2htx->regmap);
+	regcache_sync(aud2htx->regmap);
+
+	return 0;
+}
+
+static const struct dev_pm_ops fsl_aud2htx_pm_ops = {
+	SET_RUNTIME_PM_OPS(fsl_aud2htx_runtime_suspend,
+			   fsl_aud2htx_runtime_resume,
+			   NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
+static struct platform_driver fsl_aud2htx_driver = {
+	.probe = fsl_aud2htx_probe,
+	.remove = fsl_aud2htx_remove,
+	.driver = {
+		.name = "fsl-aud2htx",
+		.pm = &fsl_aud2htx_pm_ops,
+		.of_match_table = fsl_aud2htx_dt_ids,
+	},
+};
+module_platform_driver(fsl_aud2htx_driver);
+
+MODULE_AUTHOR("Shengjiu Wang <Shengjiu.Wang@nxp.com>");
+MODULE_DESCRIPTION("NXP AUD2HTX driver");
+MODULE_LICENSE("GPL v2");