9952f6918d
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright Intel Corporation (C) 2017. All Rights Reserved
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*
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* Reset driver for Altera Arria10 MAX5 System Resource Chip
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*
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* Adapted from reset-socfpga.c
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*/
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#include <linux/err.h>
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#include <linux/mfd/altera-a10sr.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <dt-bindings/reset/altr,rst-mgr-a10sr.h>
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struct a10sr_reset {
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struct reset_controller_dev rcdev;
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struct regmap *regmap;
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};
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static inline struct a10sr_reset *to_a10sr_rst(struct reset_controller_dev *rc)
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{
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return container_of(rc, struct a10sr_reset, rcdev);
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}
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static inline int a10sr_reset_shift(unsigned long id)
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{
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switch (id) {
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case A10SR_RESET_ENET_HPS:
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return 1;
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case A10SR_RESET_PCIE:
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case A10SR_RESET_FILE:
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case A10SR_RESET_BQSPI:
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case A10SR_RESET_USB:
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return id + 11;
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default:
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return -EINVAL;
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}
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}
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static int a10sr_reset_update(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct a10sr_reset *a10r = to_a10sr_rst(rcdev);
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int offset = a10sr_reset_shift(id);
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u8 mask = ALTR_A10SR_REG_BIT_MASK(offset);
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int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset);
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return regmap_update_bits(a10r->regmap, index, mask, assert ? 0 : mask);
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}
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static int a10sr_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return a10sr_reset_update(rcdev, id, true);
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}
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static int a10sr_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return a10sr_reset_update(rcdev, id, false);
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}
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static int a10sr_reset_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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int ret;
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struct a10sr_reset *a10r = to_a10sr_rst(rcdev);
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int offset = a10sr_reset_shift(id);
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u8 mask = ALTR_A10SR_REG_BIT_MASK(offset);
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int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset);
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unsigned int value;
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ret = regmap_read(a10r->regmap, index, &value);
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if (ret < 0)
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return ret;
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return !!(value & mask);
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}
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static const struct reset_control_ops a10sr_reset_ops = {
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.assert = a10sr_reset_assert,
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.deassert = a10sr_reset_deassert,
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.status = a10sr_reset_status,
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};
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static int a10sr_reset_probe(struct platform_device *pdev)
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{
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struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
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struct a10sr_reset *a10r;
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a10r = devm_kzalloc(&pdev->dev, sizeof(struct a10sr_reset),
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GFP_KERNEL);
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if (!a10r)
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return -ENOMEM;
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a10r->rcdev.owner = THIS_MODULE;
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a10r->rcdev.nr_resets = A10SR_RESET_NUM;
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a10r->rcdev.ops = &a10sr_reset_ops;
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a10r->rcdev.of_node = pdev->dev.of_node;
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a10r->regmap = a10sr->regmap;
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platform_set_drvdata(pdev, a10r);
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return devm_reset_controller_register(&pdev->dev, &a10r->rcdev);
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}
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static const struct of_device_id a10sr_reset_of_match[] = {
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{ .compatible = "altr,a10sr-reset" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, a10sr_reset_of_match);
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static struct platform_driver a10sr_reset_driver = {
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.probe = a10sr_reset_probe,
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.driver = {
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.name = "altr_a10sr_reset",
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},
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};
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module_platform_driver(a10sr_reset_driver);
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MODULE_AUTHOR("Thor Thayer <thor.thayer@linux.intel.com>");
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MODULE_DESCRIPTION("Altera Arria10 System Resource Reset Controller Driver");
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MODULE_LICENSE("GPL v2");
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