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-mmp3-hsic.c (1948B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
      4 */
      5
      6#include <linux/delay.h>
      7#include <linux/io.h>
      8#include <linux/module.h>
      9#include <linux/phy/phy.h>
     10#include <linux/platform_device.h>
     11
     12#define HSIC_CTRL	0x08
     13#define HSIC_ENABLE	BIT(7)
     14#define PLL_BYPASS	BIT(4)
     15
     16static int mmp3_hsic_phy_init(struct phy *phy)
     17{
     18	void __iomem *base = (void __iomem *)phy_get_drvdata(phy);
     19	u32 hsic_ctrl;
     20
     21	hsic_ctrl = readl_relaxed(base + HSIC_CTRL);
     22	hsic_ctrl |= HSIC_ENABLE;
     23	hsic_ctrl |= PLL_BYPASS;
     24	writel_relaxed(hsic_ctrl, base + HSIC_CTRL);
     25
     26	return 0;
     27}
     28
     29static const struct phy_ops mmp3_hsic_phy_ops = {
     30	.init		= mmp3_hsic_phy_init,
     31	.owner		= THIS_MODULE,
     32};
     33
     34static const struct of_device_id mmp3_hsic_phy_of_match[] = {
     35	{ .compatible = "marvell,mmp3-hsic-phy", },
     36	{ },
     37};
     38MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
     39
     40static int mmp3_hsic_phy_probe(struct platform_device *pdev)
     41{
     42	struct device *dev = &pdev->dev;
     43	struct phy_provider *provider;
     44	struct resource *resource;
     45	void __iomem *base;
     46	struct phy *phy;
     47
     48	resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     49	base = devm_ioremap_resource(dev, resource);
     50	if (IS_ERR(base))
     51		return PTR_ERR(base);
     52
     53	phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops);
     54	if (IS_ERR(phy)) {
     55		dev_err(dev, "failed to create PHY\n");
     56		return PTR_ERR(phy);
     57	}
     58
     59	phy_set_drvdata(phy, (void *)base);
     60	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
     61	if (IS_ERR(provider)) {
     62		dev_err(dev, "failed to register PHY provider\n");
     63		return PTR_ERR(provider);
     64	}
     65
     66	return 0;
     67}
     68
     69static struct platform_driver mmp3_hsic_phy_driver = {
     70	.probe		= mmp3_hsic_phy_probe,
     71	.driver		= {
     72		.name	= "mmp3-hsic-phy",
     73		.of_match_table = mmp3_hsic_phy_of_match,
     74	},
     75};
     76module_platform_driver(mmp3_hsic_phy_driver);
     77
     78MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
     79MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
     80MODULE_LICENSE("GPL");