1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
new file mode 100644
index 000000000000..6b357adfe646
--- /dev/null
+++ b/drivers/reset/reset-imx8mp-audiomix.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2024 NXP
+ */
+
+#include <dt-bindings/reset/imx8mp-reset-audiomix.h>
+
+#include <linux/auxiliary_bus.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/reset-controller.h>
+
+#define IMX8MP_AUDIOMIX_EARC_RESET_OFFSET	0x200
+#define IMX8MP_AUDIOMIX_EARC_RESET_MASK		BIT(1)
+#define IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK	BIT(2)
+
+#define IMX8MP_AUDIOMIX_DSP_RUNSTALL_OFFSET	0x108
+#define IMX8MP_AUDIOMIX_DSP_RUNSTALL_MASK	BIT(5)
+
+struct imx8mp_reset_map {
+	unsigned int offset;
+	unsigned int mask;
+	bool active_low;
+};
+
+static const struct imx8mp_reset_map reset_map[] = {
+	[IMX8MP_AUDIOMIX_EARC_RESET] = {
+		.offset	= IMX8MP_AUDIOMIX_EARC_RESET_OFFSET,
+		.mask	= IMX8MP_AUDIOMIX_EARC_RESET_MASK,
+		.active_low = true,
+	},
+	[IMX8MP_AUDIOMIX_EARC_PHY_RESET] = {
+		.offset	= IMX8MP_AUDIOMIX_EARC_RESET_OFFSET,
+		.mask	= IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK,
+		.active_low = true,
+	},
+	[IMX8MP_AUDIOMIX_DSP_RUNSTALL] = {
+		.offset	= IMX8MP_AUDIOMIX_DSP_RUNSTALL_OFFSET,
+		.mask	= IMX8MP_AUDIOMIX_DSP_RUNSTALL_MASK,
+		.active_low = false,
+	},
+};
+
+struct imx8mp_audiomix_reset {
+	struct reset_controller_dev rcdev;
+	spinlock_t lock; /* protect register read-modify-write cycle */
+	void __iomem *base;
+};
+
+static struct imx8mp_audiomix_reset *to_imx8mp_audiomix_reset(struct reset_controller_dev *rcdev)
+{
+	return container_of(rcdev, struct imx8mp_audiomix_reset, rcdev);
+}
+
+static int imx8mp_audiomix_update(struct reset_controller_dev *rcdev,
+				  unsigned long id, bool assert)
+{
+	struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
+	void __iomem *reg_addr = priv->base;
+	unsigned int mask, offset, active_low;
+	unsigned long reg, flags;
+
+	mask = reset_map[id].mask;
+	offset = reset_map[id].offset;
+	active_low = reset_map[id].active_low;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	reg = readl(reg_addr + offset);
+	if (active_low ^ assert)
+		reg |= mask;
+	else
+		reg &= ~mask;
+	writel(reg, reg_addr + offset);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
+					unsigned long id)
+{
+	return imx8mp_audiomix_update(rcdev, id, true);
+}
+
+static int imx8mp_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
+					  unsigned long id)
+{
+	return imx8mp_audiomix_update(rcdev, id, false);
+}
+
+static const struct reset_control_ops imx8mp_audiomix_reset_ops = {
+	.assert   = imx8mp_audiomix_reset_assert,
+	.deassert = imx8mp_audiomix_reset_deassert,
+};
+
+static int imx8mp_audiomix_reset_probe(struct auxiliary_device *adev,
+				       const struct auxiliary_device_id *id)
+{
+	struct imx8mp_audiomix_reset *priv;
+	struct device *dev = &adev->dev;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	spin_lock_init(&priv->lock);
+
+	priv->rcdev.owner     = THIS_MODULE;
+	priv->rcdev.nr_resets = ARRAY_SIZE(reset_map);
+	priv->rcdev.ops       = &imx8mp_audiomix_reset_ops;
+	priv->rcdev.of_node   = dev->parent->of_node;
+	priv->rcdev.dev	      = dev;
+	priv->rcdev.of_reset_n_cells = 1;
+	priv->base            = of_iomap(dev->parent->of_node, 0);
+	if (!priv->base)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, priv);
+
+	ret = devm_reset_controller_register(dev, &priv->rcdev);
+	if (ret)
+		goto out_unmap;
+
+	return 0;
+
+out_unmap:
+	iounmap(priv->base);
+	return ret;
+}
+
+static void imx8mp_audiomix_reset_remove(struct auxiliary_device *adev)
+{
+	struct imx8mp_audiomix_reset *priv = dev_get_drvdata(&adev->dev);
+
+	iounmap(priv->base);
+}
+
+static const struct auxiliary_device_id imx8mp_audiomix_reset_ids[] = {
+	{
+		.name = "clk_imx8mp_audiomix.reset",
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(auxiliary, imx8mp_audiomix_reset_ids);
+
+static struct auxiliary_driver imx8mp_audiomix_reset_driver = {
+	.probe		= imx8mp_audiomix_reset_probe,
+	.remove		= imx8mp_audiomix_reset_remove,
+	.id_table	= imx8mp_audiomix_reset_ids,
+};
+
+module_auxiliary_driver(imx8mp_audiomix_reset_driver);
+
+MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
+MODULE_DESCRIPTION("Freescale i.MX8MP Audio Block Controller reset driver");
+MODULE_LICENSE("GPL");