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-bcm-kona-usb2.c (3373B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
      4 *
      5 * Copyright (C) 2013 Linaro Limited
      6 * Matt Porter <mporter@linaro.org>
      7 */
      8
      9#include <linux/clk.h>
     10#include <linux/delay.h>
     11#include <linux/err.h>
     12#include <linux/io.h>
     13#include <linux/module.h>
     14#include <linux/of.h>
     15#include <linux/phy/phy.h>
     16#include <linux/platform_device.h>
     17
     18#define OTGCTL			(0)
     19#define OTGCTL_OTGSTAT2		BIT(31)
     20#define OTGCTL_OTGSTAT1		BIT(30)
     21#define OTGCTL_PRST_N_SW	BIT(11)
     22#define OTGCTL_HRESET_N		BIT(10)
     23#define OTGCTL_UTMI_LINE_STATE1	BIT(9)
     24#define OTGCTL_UTMI_LINE_STATE0	BIT(8)
     25
     26#define P1CTL			(8)
     27#define P1CTL_SOFT_RESET	BIT(1)
     28#define P1CTL_NON_DRIVING	BIT(0)
     29
     30struct bcm_kona_usb {
     31	void __iomem *regs;
     32};
     33
     34static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
     35{
     36	u32 val;
     37
     38	val = readl(phy->regs + OTGCTL);
     39	if (on) {
     40		/* Configure and power PHY */
     41		val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
     42			 OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
     43		val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
     44	} else {
     45		val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
     46	}
     47	writel(val, phy->regs + OTGCTL);
     48}
     49
     50static int bcm_kona_usb_phy_init(struct phy *gphy)
     51{
     52	struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
     53	u32 val;
     54
     55	/* Soft reset PHY */
     56	val = readl(phy->regs + P1CTL);
     57	val &= ~P1CTL_NON_DRIVING;
     58	val |= P1CTL_SOFT_RESET;
     59	writel(val, phy->regs + P1CTL);
     60	writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
     61	/* Reset needs to be asserted for 2ms */
     62	mdelay(2);
     63	writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
     64
     65	return 0;
     66}
     67
     68static int bcm_kona_usb_phy_power_on(struct phy *gphy)
     69{
     70	struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
     71
     72	bcm_kona_usb_phy_power(phy, 1);
     73
     74	return 0;
     75}
     76
     77static int bcm_kona_usb_phy_power_off(struct phy *gphy)
     78{
     79	struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
     80
     81	bcm_kona_usb_phy_power(phy, 0);
     82
     83	return 0;
     84}
     85
     86static const struct phy_ops ops = {
     87	.init		= bcm_kona_usb_phy_init,
     88	.power_on	= bcm_kona_usb_phy_power_on,
     89	.power_off	= bcm_kona_usb_phy_power_off,
     90	.owner		= THIS_MODULE,
     91};
     92
     93static int bcm_kona_usb2_probe(struct platform_device *pdev)
     94{
     95	struct device *dev = &pdev->dev;
     96	struct bcm_kona_usb *phy;
     97	struct phy *gphy;
     98	struct phy_provider *phy_provider;
     99
    100	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
    101	if (!phy)
    102		return -ENOMEM;
    103
    104	phy->regs = devm_platform_ioremap_resource(pdev, 0);
    105	if (IS_ERR(phy->regs))
    106		return PTR_ERR(phy->regs);
    107
    108	platform_set_drvdata(pdev, phy);
    109
    110	gphy = devm_phy_create(dev, NULL, &ops);
    111	if (IS_ERR(gphy))
    112		return PTR_ERR(gphy);
    113
    114	/* The Kona PHY supports an 8-bit wide UTMI interface */
    115	phy_set_bus_width(gphy, 8);
    116
    117	phy_set_drvdata(gphy, phy);
    118
    119	phy_provider = devm_of_phy_provider_register(dev,
    120			of_phy_simple_xlate);
    121
    122	return PTR_ERR_OR_ZERO(phy_provider);
    123}
    124
    125static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
    126	{ .compatible = "brcm,kona-usb2-phy" },
    127	{ /* sentinel */ }
    128};
    129
    130MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
    131
    132static struct platform_driver bcm_kona_usb2_driver = {
    133	.probe		= bcm_kona_usb2_probe,
    134	.driver		= {
    135		.name	= "bcm-kona-usb2",
    136		.of_match_table = bcm_kona_usb2_dt_ids,
    137	},
    138};
    139
    140module_platform_driver(bcm_kona_usb2_driver);
    141
    142MODULE_ALIAS("platform:bcm-kona-usb2");
    143MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
    144MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
    145MODULE_LICENSE("GPL v2");