cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

phy-ath79-usb.c (2608B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Atheros AR71XX/9XXX USB PHY driver
      4 *
      5 * Copyright (C) 2015-2018 Alban Bedel <albeu@free.fr>
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/platform_device.h>
     10#include <linux/phy/phy.h>
     11#include <linux/reset.h>
     12
     13struct ath79_usb_phy {
     14	struct reset_control *reset;
     15	/* The suspend override logic is inverted, hence the no prefix
     16	 * to make the code a bit easier to understand.
     17	 */
     18	struct reset_control *no_suspend_override;
     19};
     20
     21static int ath79_usb_phy_power_on(struct phy *phy)
     22{
     23	struct ath79_usb_phy *priv = phy_get_drvdata(phy);
     24	int err = 0;
     25
     26	if (priv->no_suspend_override) {
     27		err = reset_control_assert(priv->no_suspend_override);
     28		if (err)
     29			return err;
     30	}
     31
     32	err = reset_control_deassert(priv->reset);
     33	if (err && priv->no_suspend_override)
     34		reset_control_deassert(priv->no_suspend_override);
     35
     36	return err;
     37}
     38
     39static int ath79_usb_phy_power_off(struct phy *phy)
     40{
     41	struct ath79_usb_phy *priv = phy_get_drvdata(phy);
     42	int err = 0;
     43
     44	err = reset_control_assert(priv->reset);
     45	if (err)
     46		return err;
     47
     48	if (priv->no_suspend_override) {
     49		err = reset_control_deassert(priv->no_suspend_override);
     50		if (err)
     51			reset_control_deassert(priv->reset);
     52	}
     53
     54	return err;
     55}
     56
     57static const struct phy_ops ath79_usb_phy_ops = {
     58	.power_on	= ath79_usb_phy_power_on,
     59	.power_off	= ath79_usb_phy_power_off,
     60	.owner		= THIS_MODULE,
     61};
     62
     63static int ath79_usb_phy_probe(struct platform_device *pdev)
     64{
     65	struct ath79_usb_phy *priv;
     66	struct phy *phy;
     67
     68	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
     69	if (!priv)
     70		return -ENOMEM;
     71
     72	priv->reset = devm_reset_control_get(&pdev->dev, "phy");
     73	if (IS_ERR(priv->reset))
     74		return PTR_ERR(priv->reset);
     75
     76	priv->no_suspend_override = devm_reset_control_get_optional(
     77		&pdev->dev, "usb-suspend-override");
     78	if (IS_ERR(priv->no_suspend_override))
     79		return PTR_ERR(priv->no_suspend_override);
     80
     81	phy = devm_phy_create(&pdev->dev, NULL, &ath79_usb_phy_ops);
     82	if (IS_ERR(phy))
     83		return PTR_ERR(phy);
     84
     85	phy_set_drvdata(phy, priv);
     86
     87	return PTR_ERR_OR_ZERO(devm_of_phy_provider_register(
     88				&pdev->dev, of_phy_simple_xlate));
     89}
     90
     91static const struct of_device_id ath79_usb_phy_of_match[] = {
     92	{ .compatible = "qca,ar7100-usb-phy" },
     93	{}
     94};
     95MODULE_DEVICE_TABLE(of, ath79_usb_phy_of_match);
     96
     97static struct platform_driver ath79_usb_phy_driver = {
     98	.probe	= ath79_usb_phy_probe,
     99	.driver = {
    100		.of_match_table	= ath79_usb_phy_of_match,
    101		.name		= "ath79-usb-phy",
    102	}
    103};
    104module_platform_driver(ath79_usb_phy_driver);
    105
    106MODULE_DESCRIPTION("ATH79 USB PHY driver");
    107MODULE_AUTHOR("Alban Bedel <albeu@free.fr>");
    108MODULE_LICENSE("GPL");