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};
 19
 20static inline struct zynqmp_reset_data *
 21to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
 22{
 23	return container_of(rcdev, struct zynqmp_reset_data, rcdev);
 24}
 25
 26static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
 27			       unsigned long id)
 28{
 29	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
 30				      PM_RESET_ACTION_ASSERT);
 31}
 32
 33static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
 34				 unsigned long id)
 35{
 36	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
 37				      PM_RESET_ACTION_RELEASE);
 38}
 39
 40static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
 41			       unsigned long id)
 42{
 43	int val, err;
 44
 45	err = zynqmp_pm_reset_get_status(ZYNQMP_RESET_ID + id, &val);
 46	if (err)
 47		return err;
 48
 49	return val;
 50}
 51
 52static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
 53			      unsigned long id)
 54{
 55	return zynqmp_pm_reset_assert(ZYNQMP_RESET_ID + id,
 56				      PM_RESET_ACTION_PULSE);
 57}
 58
 59static 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,
 64};
 65
 66static int zynqmp_reset_probe(struct platform_device *pdev)
 67{
 68	struct zynqmp_reset_data *priv;
 69
 70	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 71	if (!priv)
 72		return -ENOMEM;
 73
 74	platform_set_drvdata(pdev, priv);
 75
 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;
 80
 81	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
 82}
 83
 84static const struct of_device_id zynqmp_reset_dt_ids[] = {
 85	{ .compatible = "xlnx,zynqmp-reset", },
 86	{ /* sentinel */ },
 87};
 88
 89static struct platform_driver zynqmp_reset_driver = {
 90	.probe	= zynqmp_reset_probe,
 91	.driver = {
 92		.name		= KBUILD_MODNAME,
 93		.of_match_table	= zynqmp_reset_dt_ids,
 94	},
 95};
 96
 97static int __init zynqmp_reset_init(void)
 98{
 99	return platform_driver_register(&zynqmp_reset_driver);
100}
101
102arch_initcall(zynqmp_reset_init);