1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Xilinx, Inc.
9 #include <linux/platform_device.h>
10 #include <linux/reset-controller.h>
11 #include <linux/firmware/xlnx-zynqmp.h>
13 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
14 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
16 struct zynqmp_reset_data {
17 struct reset_controller_dev rcdev;
20 static inline struct zynqmp_reset_data *
21 to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
23 return container_of(rcdev, struct zynqmp_reset_data, rcdev);
26 static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
29 return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
30 PM_RESET_ACTION_ASSERT);
33 static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
36 return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
37 PM_RESET_ACTION_RELEASE);
40 static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
45 err = zynqmp_pm_reset_get_status(ZYNQMP_RESET_ID + id, &val);
52 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
55 return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
56 PM_RESET_ACTION_PULSE);
59 static const struct reset_control_ops zynqmp_reset_ops = {
60 .reset = zynqmp_reset_reset,
61 .assert = zynqmp_reset_assert,
62 .deassert = zynqmp_reset_deassert,
63 .status = zynqmp_reset_status,
66 static int zynqmp_reset_probe(struct platform_device *pdev)
68 struct zynqmp_reset_data *priv;
70 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
74 platform_set_drvdata(pdev, priv);
76 priv->rcdev.ops = &zynqmp_reset_ops;
77 priv->rcdev.owner = THIS_MODULE;
78 priv->rcdev.of_node = pdev->dev.of_node;
79 priv->rcdev.nr_resets = ZYNQMP_NR_RESETS;
81 return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
84 static const struct of_device_id zynqmp_reset_dt_ids[] = {
85 { .compatible = "xlnx,zynqmp-reset", },
89 static struct platform_driver zynqmp_reset_driver = {
90 .probe = zynqmp_reset_probe,
92 .name = KBUILD_MODNAME,
93 .of_match_table = zynqmp_reset_dt_ids,
97 static int __init zynqmp_reset_init(void)
99 return platform_driver_register(&zynqmp_reset_driver);
102 arch_initcall(zynqmp_reset_init);