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-ns-usb2.c (4292B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Broadcom Northstar USB 2.0 PHY Driver
      4 *
      5 * Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com>
      6 */
      7
      8#include <linux/bcma/bcma.h>
      9#include <linux/clk.h>
     10#include <linux/delay.h>
     11#include <linux/err.h>
     12#include <linux/mfd/syscon.h>
     13#include <linux/module.h>
     14#include <linux/of_address.h>
     15#include <linux/of_platform.h>
     16#include <linux/phy/phy.h>
     17#include <linux/platform_device.h>
     18#include <linux/regmap.h>
     19#include <linux/slab.h>
     20
     21struct bcm_ns_usb2 {
     22	struct device *dev;
     23	struct clk *ref_clk;
     24	struct phy *phy;
     25	struct regmap *clkset;
     26	void __iomem *base;
     27
     28	/* Deprecated binding */
     29	void __iomem *dmu;
     30};
     31
     32static int bcm_ns_usb2_phy_init(struct phy *phy)
     33{
     34	struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);
     35	struct device *dev = usb2->dev;
     36	u32 ref_clk_rate, usb2ctl, usb_pll_ndiv, usb_pll_pdiv;
     37	int err = 0;
     38
     39	err = clk_prepare_enable(usb2->ref_clk);
     40	if (err < 0) {
     41		dev_err(dev, "Failed to prepare ref clock: %d\n", err);
     42		goto err_out;
     43	}
     44
     45	ref_clk_rate = clk_get_rate(usb2->ref_clk);
     46	if (!ref_clk_rate) {
     47		dev_err(dev, "Failed to get ref clock rate\n");
     48		err = -EINVAL;
     49		goto err_clk_off;
     50	}
     51
     52	if (usb2->base)
     53		usb2ctl = readl(usb2->base);
     54	else
     55		usb2ctl = readl(usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);
     56
     57	if (usb2ctl & BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK) {
     58		usb_pll_pdiv = usb2ctl;
     59		usb_pll_pdiv &= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK;
     60		usb_pll_pdiv >>= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT;
     61	} else {
     62		usb_pll_pdiv = 1 << 3;
     63	}
     64
     65	/* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */
     66	usb_pll_ndiv = (1920000000 * usb_pll_pdiv) / ref_clk_rate;
     67
     68	/* Unlock DMU PLL settings with some magic value */
     69	if (usb2->clkset)
     70		regmap_write(usb2->clkset, 0, 0x0000ea68);
     71	else
     72		writel(0x0000ea68, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);
     73
     74	/* Write USB 2.0 PLL control setting */
     75	usb2ctl &= ~BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK;
     76	usb2ctl |= usb_pll_ndiv << BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT;
     77	if (usb2->base)
     78		writel(usb2ctl, usb2->base);
     79	else
     80		writel(usb2ctl, usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);
     81
     82	/* Lock DMU PLL settings */
     83	if (usb2->clkset)
     84		regmap_write(usb2->clkset, 0, 0x00000000);
     85	else
     86		writel(0x00000000, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);
     87
     88err_clk_off:
     89	clk_disable_unprepare(usb2->ref_clk);
     90err_out:
     91	return err;
     92}
     93
     94static const struct phy_ops ops = {
     95	.init		= bcm_ns_usb2_phy_init,
     96	.owner		= THIS_MODULE,
     97};
     98
     99static int bcm_ns_usb2_probe(struct platform_device *pdev)
    100{
    101	struct device *dev = &pdev->dev;
    102	struct bcm_ns_usb2 *usb2;
    103	struct phy_provider *phy_provider;
    104
    105	usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL);
    106	if (!usb2)
    107		return -ENOMEM;
    108	usb2->dev = dev;
    109
    110	if (of_find_property(dev->of_node, "brcm,syscon-clkset", NULL)) {
    111		usb2->base = devm_platform_ioremap_resource(pdev, 0);
    112		if (IS_ERR(usb2->base)) {
    113			dev_err(dev, "Failed to map control reg\n");
    114			return PTR_ERR(usb2->base);
    115		}
    116
    117		usb2->clkset = syscon_regmap_lookup_by_phandle(dev->of_node,
    118							       "brcm,syscon-clkset");
    119		if (IS_ERR(usb2->clkset)) {
    120			dev_err(dev, "Failed to lookup clkset regmap\n");
    121			return PTR_ERR(usb2->clkset);
    122		}
    123	} else {
    124		usb2->dmu = devm_platform_ioremap_resource_byname(pdev, "dmu");
    125		if (IS_ERR(usb2->dmu)) {
    126			dev_err(dev, "Failed to map DMU regs\n");
    127			return PTR_ERR(usb2->dmu);
    128		}
    129
    130		dev_warn(dev, "using deprecated DT binding\n");
    131	}
    132
    133	usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");
    134	if (IS_ERR(usb2->ref_clk)) {
    135		dev_err_probe(dev, PTR_ERR(usb2->ref_clk), "failed to get ref clk\n");
    136		return PTR_ERR(usb2->ref_clk);
    137	}
    138
    139	usb2->phy = devm_phy_create(dev, NULL, &ops);
    140	if (IS_ERR(usb2->phy))
    141		return PTR_ERR(usb2->phy);
    142
    143	phy_set_drvdata(usb2->phy, usb2);
    144	platform_set_drvdata(pdev, usb2);
    145
    146	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
    147	return PTR_ERR_OR_ZERO(phy_provider);
    148}
    149
    150static const struct of_device_id bcm_ns_usb2_id_table[] = {
    151	{ .compatible = "brcm,ns-usb2-phy", },
    152	{},
    153};
    154MODULE_DEVICE_TABLE(of, bcm_ns_usb2_id_table);
    155
    156static struct platform_driver bcm_ns_usb2_driver = {
    157	.probe		= bcm_ns_usb2_probe,
    158	.driver = {
    159		.name = "bcm_ns_usb2",
    160		.of_match_table = bcm_ns_usb2_id_table,
    161	},
    162};
    163module_platform_driver(bcm_ns_usb2_driver);
    164
    165MODULE_LICENSE("GPL v2");