1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (C) 2018 Xilinx, Inc.
  4 *
  5 */
  6
  7#include <linux/err.h>
  8#include <linux/of.h>
  9#include <linux/platform_device.h>
 10#include <linux/reset-controller.h>
 11#include <linux/firmware/xlnx-zynqmp.h>
 12
 13#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
 14#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
 15
 16struct zynqmp_reset_data {
 17	struct reset_controller_dev rcdev;
 18	const struct zynqmp_eemi_ops *eemi_ops;
 19};
 20
 21static inline struct zynqmp_reset_data *
 22to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
 23{
 24	return container_of(rcdev, struct zynqmp_reset_data, rcdev);
 25}
 26
 27static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
 28			       unsigned long id)
 29{
 30	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
 31
 32	return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
 33					    PM_RESET_ACTION_ASSERT);
 34}
 35
 36static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
 37				 unsigned long id)
 38{
 39	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
 40
 41	return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
 42					    PM_RESET_ACTION_RELEASE);
 43}
 44
 45static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
 46			       unsigned long id)
 47{
 48	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
 49	int val, err;
 50
 51	err = priv->eemi_ops->reset_get_status(ZYNQMP_RESET_ID + id, &val);
 52	if (err)
 53		return err;
 54
 55	return val;
 56}
 57
 58static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
 59			      unsigned long id)
 60{
 61	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
 62
 63	return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
 64					    PM_RESET_ACTION_PULSE);
 65}
 66
 67static struct reset_control_ops zynqmp_reset_ops = {
 68	.reset = zynqmp_reset_reset,
 69	.assert = zynqmp_reset_assert,
 70	.deassert = zynqmp_reset_deassert,
 71	.status = zynqmp_reset_status,
 72};
 73
 74static int zynqmp_reset_probe(struct platform_device *pdev)
 75{
 76	struct zynqmp_reset_data *priv;
 77
 78	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 79	if (!priv)
 80		return -ENOMEM;
 81
 82	priv->eemi_ops = zynqmp_pm_get_eemi_ops();
 83	if (IS_ERR(priv->eemi_ops))
 84		return PTR_ERR(priv->eemi_ops);
 85
 86	platform_set_drvdata(pdev, priv);
 87
 88	priv->rcdev.ops = &zynqmp_reset_ops;
 89	priv->rcdev.owner = THIS_MODULE;
 90	priv->rcdev.of_node = pdev->dev.of_node;
 91	priv->rcdev.nr_resets = ZYNQMP_NR_RESETS;
 92
 93	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
 94}
 95
 96static const struct of_device_id zynqmp_reset_dt_ids[] = {
 97	{ .compatible = "xlnx,zynqmp-reset", },
 98	{ /* sentinel */ },
 99};
100
101static struct platform_driver zynqmp_reset_driver = {
102	.probe	= zynqmp_reset_probe,
103	.driver = {
104		.name		= KBUILD_MODNAME,
105		.of_match_table	= zynqmp_reset_dt_ids,
106	},
107};
108
109static int __init zynqmp_reset_init(void)
110{
111	return platform_driver_register(&zynqmp_reset_driver);
112}
113
114arch_initcall(zynqmp_reset_init);