[linux-2.6-block.git] / drivers / reset / reset-zynqmp.c

// 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>

#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START

struct zynqmp_reset_data {
	struct reset_controller_dev rcdev;
	const struct zynqmp_eemi_ops *eemi_ops;
};

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 priv->eemi_ops->reset_assert(ZYNQMP_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 priv->eemi_ops->reset_assert(ZYNQMP_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 val, err;

	err = priv->eemi_ops->reset_get_status(ZYNQMP_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 priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id,
					    PM_RESET_ACTION_PULSE);
}

static 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->eemi_ops = zynqmp_pm_get_eemi_ops();
	if (IS_ERR(priv->eemi_ops))
		return PTR_ERR(priv->eemi_ops);

	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 = ZYNQMP_NR_RESETS;

	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
}

static const struct of_device_id zynqmp_reset_dt_ids[] = {
	{ .compatible = "xlnx,zynqmp-reset", },
	{ /* 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);
Commit	Line	Data
62f0d7dc NM	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
	16	struct zynqmp_reset_data {
	17	struct reset_controller_dev rcdev;
	18	const struct zynqmp_eemi_ops *eemi_ops;
	19	};
	20
	21	static inline struct zynqmp_reset_data *
	22	to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
	23	{
	24	return container_of(rcdev, struct zynqmp_reset_data, rcdev);
	25	}
	26
	27	static 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
	36	static 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
	45	static 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
	58	static 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
67	static 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
74	static 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
62f0d7dc	82	priv->eemi_ops = zynqmp_pm_get_eemi_ops();
3d031378 RV	83	if (IS_ERR(priv->eemi_ops))
	84	return PTR_ERR(priv->eemi_ops);
	85
	86	platform_set_drvdata(pdev, priv);
62f0d7dc NM	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
	96	static const struct of_device_id zynqmp_reset_dt_ids[] = {
	97	{ .compatible = "xlnx,zynqmp-reset", },
	98	{ /* sentinel */ },
	99	};
	100
	101	static 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
	109	static int __init zynqmp_reset_init(void)
	110	{
	111	return platform_driver_register(&zynqmp_reset_driver);
	112	}
	113
	114	arch_initcall(zynqmp_reset_init);