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path: root/drivers/reset/reset-imx8mp-audiomix.c
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Diffstat (limited to 'drivers/reset/reset-imx8mp-audiomix.c')
-rw-r--r--drivers/reset/reset-imx8mp-audiomix.c128
1 files changed, 128 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..6e3f3069f727
--- /dev/null
+++ b/drivers/reset/reset-imx8mp-audiomix.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2024 NXP
+ */
+
+#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 EARC 0x200
+#define EARC_RESET_MASK 0x3
+
+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_reset_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
+ void __iomem *reg_addr = priv->base;
+ unsigned int mask, reg;
+ unsigned long flags;
+
+ mask = BIT(id);
+ spin_lock_irqsave(&priv->lock, flags);
+ reg = readl(reg_addr + EARC);
+ writel(reg & ~mask, reg_addr + EARC);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+static int imx8mp_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
+ void __iomem *reg_addr = priv->base;
+ unsigned int mask, reg;
+ unsigned long flags;
+
+ mask = BIT(id);
+ spin_lock_irqsave(&priv->lock, flags);
+ reg = readl(reg_addr + EARC);
+ writel(reg | mask, reg_addr + EARC);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+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 = fls(EARC_RESET_MASK);
+ 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");