reset: reset-zynqmp: Adding support for Xilinx zynqmp reset controller. (62f0d7dc) · Commits · 戴 / test

drivers/reset/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -25,4 +25,5 @@ obj-$(CONFIG_RESET_TI_SYSCON) += reset-ti-syscon.o
		obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
		obj-$(CONFIG_RESET_UNIPHIER_USB3) += reset-uniphier-usb3.o
		obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o
		obj-$(CONFIG_ARCH_ZYNQMP) += reset-zynqmp.o

drivers/reset/reset-zynqmp.c

0 → 100644

+114 −0

Original line number	Diff line number	Diff line
		// 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;

		platform_set_drvdata(pdev, priv);

		priv->eemi_ops = zynqmp_pm_get_eemi_ops();
		if (!priv->eemi_ops)
		return -ENXIO;

		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);

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