Yu Chen
127 lines
3.3 KiB
C
Executable File
127 lines
3.3 KiB
C
Executable File
/*
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* Copyright (c) 2017-2018 HiSilicon Technologies Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset-controller.h>
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struct usb31misc_reset_controller {
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struct reset_controller_dev rst;
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struct regmap *map;
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};
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#define to_usb31misc_reset_controller(_rst) \
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container_of(_rst, struct usb31misc_reset_controller, rst)
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static int usb31misc_reset_program_hw(struct reset_controller_dev *rcdev,
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unsigned long idx, bool assert)
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{
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struct usb31misc_reset_controller *rc =
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to_usb31misc_reset_controller(rcdev);
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unsigned int offset = idx >> 8;
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unsigned int mask = BIT(idx & 0x1f);
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if (assert)
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return regmap_update_bits(rc->map, offset, mask, 0);
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else
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return regmap_update_bits(rc->map, offset, mask, mask);
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}
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static int usb31misc_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long idx)
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{
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return usb31misc_reset_program_hw(rcdev, idx, true);
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}
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static int usb31misc_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long idx)
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{
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return usb31misc_reset_program_hw(rcdev, idx, false);
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}
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static int usb31misc_reset_dev(struct reset_controller_dev *rcdev,
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unsigned long idx)
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{
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int err;
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err = usb31misc_reset_assert(rcdev, idx);
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if (err)
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return err;
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return usb31misc_reset_deassert(rcdev, idx);
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}
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static struct reset_control_ops usb31misc_reset_ops = {
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.reset = usb31misc_reset_dev,
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.assert = usb31misc_reset_assert,
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.deassert = usb31misc_reset_deassert,
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};
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static int usb31misc_reset_xlate(struct reset_controller_dev *rcdev,
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const struct of_phandle_args *reset_spec)
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{
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unsigned int offset, bit;
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offset = reset_spec->args[0];
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bit = reset_spec->args[1];
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return (offset << 8) | bit;
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}
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static int usb31misc_reset_probe(struct platform_device *pdev)
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{
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struct usb31misc_reset_controller *rc;
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL);
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if (!rc)
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return -ENOMEM;
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rc->map = syscon_regmap_lookup_by_phandle(np, "hisi,rst-syscon");
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if (IS_ERR(rc->map)) {
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dev_err(dev, "failed to get usb31misc,rst-syscon\n");
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return PTR_ERR(rc->map);
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}
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rc->rst.ops = &usb31misc_reset_ops,
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rc->rst.of_node = np;
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rc->rst.of_reset_n_cells = 2;
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rc->rst.of_xlate = usb31misc_reset_xlate;
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return reset_controller_register(&rc->rst);
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}
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static const struct of_device_id usb31misc_reset_match[] = {
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{ .compatible = "hisilicon,kirin970-usb31-misc-reset", },
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{},
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};
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MODULE_DEVICE_TABLE(of, usb31misc_reset_match);
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static struct platform_driver usb31misc_reset_driver = {
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.probe = usb31misc_reset_probe,
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.driver = {
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.name = "usb31misc-reset",
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.of_match_table = usb31misc_reset_match,
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},
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};
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static int __init usb31misc_reset_init(void)
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{
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return platform_driver_register(&usb31misc_reset_driver);
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}
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arch_initcall(usb31misc_reset_init);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:kirin970-usb31misc-reset");
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MODULE_DESCRIPTION("HiSilicon Kirin970 USB3 Misc Reset Driver");
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