cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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phy-lpc18xx-usb-otg.c (3432B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY
      4 *
      5 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
      6 */
      7
      8#include <linux/clk.h>
      9#include <linux/err.h>
     10#include <linux/mfd/syscon.h>
     11#include <linux/module.h>
     12#include <linux/of.h>
     13#include <linux/phy/phy.h>
     14#include <linux/platform_device.h>
     15#include <linux/regmap.h>
     16
     17/* USB OTG PHY register offset and bit in CREG */
     18#define LPC18XX_CREG_CREG0		0x004
     19#define LPC18XX_CREG_CREG0_USB0PHY	BIT(5)
     20
     21struct lpc18xx_usb_otg_phy {
     22	struct phy *phy;
     23	struct clk *clk;
     24	struct regmap *reg;
     25};
     26
     27static int lpc18xx_usb_otg_phy_init(struct phy *phy)
     28{
     29	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
     30	int ret;
     31
     32	/* The PHY must be clocked at 480 MHz */
     33	ret = clk_set_rate(lpc->clk, 480000000);
     34	if (ret)
     35		return ret;
     36
     37	return clk_prepare(lpc->clk);
     38}
     39
     40static int lpc18xx_usb_otg_phy_exit(struct phy *phy)
     41{
     42	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
     43
     44	clk_unprepare(lpc->clk);
     45
     46	return 0;
     47}
     48
     49static int lpc18xx_usb_otg_phy_power_on(struct phy *phy)
     50{
     51	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
     52	int ret;
     53
     54	ret = clk_enable(lpc->clk);
     55	if (ret)
     56		return ret;
     57
     58	/* The bit in CREG is cleared to enable the PHY */
     59	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
     60				  LPC18XX_CREG_CREG0_USB0PHY, 0);
     61	if (ret) {
     62		clk_disable(lpc->clk);
     63		return ret;
     64	}
     65
     66	return 0;
     67}
     68
     69static int lpc18xx_usb_otg_phy_power_off(struct phy *phy)
     70{
     71	struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy);
     72	int ret;
     73
     74	ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0,
     75				 LPC18XX_CREG_CREG0_USB0PHY,
     76				 LPC18XX_CREG_CREG0_USB0PHY);
     77	if (ret)
     78		return ret;
     79
     80	clk_disable(lpc->clk);
     81
     82	return 0;
     83}
     84
     85static const struct phy_ops lpc18xx_usb_otg_phy_ops = {
     86	.init		= lpc18xx_usb_otg_phy_init,
     87	.exit		= lpc18xx_usb_otg_phy_exit,
     88	.power_on	= lpc18xx_usb_otg_phy_power_on,
     89	.power_off	= lpc18xx_usb_otg_phy_power_off,
     90	.owner		= THIS_MODULE,
     91};
     92
     93static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev)
     94{
     95	struct phy_provider *phy_provider;
     96	struct lpc18xx_usb_otg_phy *lpc;
     97
     98	lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL);
     99	if (!lpc)
    100		return -ENOMEM;
    101
    102	lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent);
    103	if (IS_ERR(lpc->reg)) {
    104		dev_err(&pdev->dev, "failed to get syscon\n");
    105		return PTR_ERR(lpc->reg);
    106	}
    107
    108	lpc->clk = devm_clk_get(&pdev->dev, NULL);
    109	if (IS_ERR(lpc->clk)) {
    110		dev_err(&pdev->dev, "failed to get clock\n");
    111		return PTR_ERR(lpc->clk);
    112	}
    113
    114	lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops);
    115	if (IS_ERR(lpc->phy)) {
    116		dev_err(&pdev->dev, "failed to create PHY\n");
    117		return PTR_ERR(lpc->phy);
    118	}
    119
    120	phy_set_drvdata(lpc->phy, lpc);
    121
    122	phy_provider = devm_of_phy_provider_register(&pdev->dev,
    123						     of_phy_simple_xlate);
    124
    125	return PTR_ERR_OR_ZERO(phy_provider);
    126}
    127
    128static const struct of_device_id lpc18xx_usb_otg_phy_match[] = {
    129	{ .compatible = "nxp,lpc1850-usb-otg-phy" },
    130	{ }
    131};
    132MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match);
    133
    134static struct platform_driver lpc18xx_usb_otg_phy_driver = {
    135	.probe		= lpc18xx_usb_otg_phy_probe,
    136	.driver		= {
    137		.name	= "lpc18xx-usb-otg-phy",
    138		.of_match_table = lpc18xx_usb_otg_phy_match,
    139	},
    140};
    141module_platform_driver(lpc18xx_usb_otg_phy_driver);
    142
    143MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
    144MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver");
    145MODULE_LICENSE("GPL v2");