1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/reset/reset-zynqmp.c b/drivers/reset/reset-zynqmp.c
new file mode 100644
index 000000000..59dc0ff9a
--- /dev/null
+++ b/drivers/reset/reset-zynqmp.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Xilinx, Inc.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/firmware/xlnx-zynqmp.h>
+#include <linux/of_device.h>
+
+#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
+#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
+#define VERSAL_NR_RESETS	95
+
+struct zynqmp_reset_soc_data {
+	u32 reset_id;
+	u32 num_resets;
+};
+
+struct zynqmp_reset_data {
+	struct reset_controller_dev rcdev;
+	const struct zynqmp_reset_soc_data *data;
+};
+
+static inline struct zynqmp_reset_data *
+to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
+{
+	return container_of(rcdev, struct zynqmp_reset_data, rcdev);
+}
+
+static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
+				      PM_RESET_ACTION_ASSERT);
+}
+
+static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
+				 unsigned long id)
+{
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
+				      PM_RESET_ACTION_RELEASE);
+}
+
+static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+	int err;
+	u32 val;
+
+	err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
+	if (err)
+		return err;
+
+	return val;
+}
+
+static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
+
+	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
+				      PM_RESET_ACTION_PULSE);
+}
+
+static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
+				 const struct of_phandle_args *reset_spec)
+{
+	return reset_spec->args[0];
+}
+
+static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
+	.reset_id = ZYNQMP_RESET_ID,
+	.num_resets = ZYNQMP_NR_RESETS,
+};
+
+static const struct zynqmp_reset_soc_data versal_reset_data = {
+	.reset_id = 0,
+	.num_resets = VERSAL_NR_RESETS,
+};
+
+static const struct reset_control_ops zynqmp_reset_ops = {
+	.reset = zynqmp_reset_reset,
+	.assert = zynqmp_reset_assert,
+	.deassert = zynqmp_reset_deassert,
+	.status = zynqmp_reset_status,
+};
+
+static int zynqmp_reset_probe(struct platform_device *pdev)
+{
+	struct zynqmp_reset_data *priv;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->data = of_device_get_match_data(&pdev->dev);
+	if (!priv->data)
+		return -EINVAL;
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->rcdev.ops = &zynqmp_reset_ops;
+	priv->rcdev.owner = THIS_MODULE;
+	priv->rcdev.of_node = pdev->dev.of_node;
+	priv->rcdev.nr_resets = priv->data->num_resets;
+	priv->rcdev.of_reset_n_cells = 1;
+	priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
+
+	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
+}
+
+static const struct of_device_id zynqmp_reset_dt_ids[] = {
+	{ .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
+	{ .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
+	{ /* sentinel */ },
+};
+
+static struct platform_driver zynqmp_reset_driver = {
+	.probe	= zynqmp_reset_probe,
+	.driver = {
+		.name		= KBUILD_MODNAME,
+		.of_match_table	= zynqmp_reset_dt_ids,
+	},
+};
+
+static int __init zynqmp_reset_init(void)
+{
+	return platform_driver_register(&zynqmp_reset_driver);
+}
+
+arch_initcall(zynqmp_reset_init);