[linux.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>
#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);
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>
552f388b	12	#include <linux/of_device.h>
62f0d7dc NM	13
	14	#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
	15	#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
552f388b SKP	16	#define VERSAL_NR_RESETS 95
	17
	18	struct zynqmp_reset_soc_data {
	19	u32 reset_id;
	20	u32 num_resets;
	21	};
62f0d7dc NM	22
	23	struct zynqmp_reset_data {
	24	struct reset_controller_dev rcdev;
552f388b	25	const struct zynqmp_reset_soc_data *data;
62f0d7dc NM	26	};
	27
	28	static inline struct zynqmp_reset_data *
	29	to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
	30	{
	31	return container_of(rcdev, struct zynqmp_reset_data, rcdev);
	32	}
	33
	34	static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
	35	unsigned long id)
	36	{
552f388b SKP	37	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
	38
	39	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
cf23ec35	40	PM_RESET_ACTION_ASSERT);
62f0d7dc NM	41	}
	42
	43	static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
	44	unsigned long id)
	45	{
552f388b SKP	46	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
	47
	48	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
cf23ec35	49	PM_RESET_ACTION_RELEASE);
62f0d7dc NM	50	}
	51
	52	static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
	53	unsigned long id)
	54	{
552f388b	55	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
ed104ca4 SKP	56	int err;
ed104ca4 SKP	57	u32 val;
62f0d7dc	58
552f388b	59	err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
62f0d7dc NM	60	if (err)
	61	return err;
	62
	63	return val;
	64	}
	65
	66	static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
	67	unsigned long id)
	68	{
552f388b SKP	69	struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
	70
	71	return zynqmp_pm_reset_assert(priv->data->reset_id + id,
cf23ec35	72	PM_RESET_ACTION_PULSE);
62f0d7dc NM	73	}
62f0d7dc NM	74
552f388b SKP	75	static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
	76	const struct of_phandle_args *reset_spec)
	77	{
	78	return reset_spec->args[0];
	79	}
	80
	81	static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
	82	.reset_id = ZYNQMP_RESET_ID,
	83	.num_resets = ZYNQMP_NR_RESETS,
	84	};
	85
	86	static const struct zynqmp_reset_soc_data versal_reset_data = {
829cdfe0 PZ	87	.reset_id = 0,
829cdfe0 PZ	88	.num_resets = VERSAL_NR_RESETS,
552f388b SKP	89	};
552f388b SKP	90
c1b065b4	91	static const struct reset_control_ops zynqmp_reset_ops = {
62f0d7dc NM	92	.reset = zynqmp_reset_reset,
	93	.assert = zynqmp_reset_assert,
	94	.deassert = zynqmp_reset_deassert,
	95	.status = zynqmp_reset_status,
	96	};
	97
	98	static int zynqmp_reset_probe(struct platform_device *pdev)
	99	{
	100	struct zynqmp_reset_data *priv;
	101
	102	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	103	if (!priv)
	104	return -ENOMEM;
	105
552f388b SKP	106	priv->data = of_device_get_match_data(&pdev->dev);
	107	if (!priv->data)
	108	return -EINVAL;
	109
3d031378	110	platform_set_drvdata(pdev, priv);
62f0d7dc NM	111
	112	priv->rcdev.ops = &zynqmp_reset_ops;
	113	priv->rcdev.owner = THIS_MODULE;
	114	priv->rcdev.of_node = pdev->dev.of_node;
552f388b SKP	115	priv->rcdev.nr_resets = priv->data->num_resets;
	116	priv->rcdev.of_reset_n_cells = 1;
	117	priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
62f0d7dc NM	118
	119	return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
	120	}
	121
	122	static const struct of_device_id zynqmp_reset_dt_ids[] = {
552f388b SKP	123	{ .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
552f388b SKP	124	{ .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
62f0d7dc NM	125	{ /* sentinel */ },
	126	};
	127
	128	static struct platform_driver zynqmp_reset_driver = {
	129	.probe = zynqmp_reset_probe,
	130	.driver = {
	131	.name = KBUILD_MODNAME,
	132	.of_match_table = zynqmp_reset_dt_ids,
	133	},
	134	};
	135
	136	static int __init zynqmp_reset_init(void)
	137	{
	138	return platform_driver_register(&zynqmp_reset_driver);
	139	}
	140
	141	arch_initcall(zynqmp_reset_init);