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-ns2-pcie.c (2506B)

      1/*
      2 * Copyright (C) 2016 Broadcom
      3 *
      4 * This program is free software; you can redistribute it and/or
      5 * modify it under the terms of the GNU General Public License as
      6 * published by the Free Software Foundation version 2.
      7 *
      8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
      9 * kind, whether express or implied; without even the implied warranty
     10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11 * GNU General Public License for more details.
     12 */
     13
     14#include <linux/device.h>
     15#include <linux/module.h>
     16#include <linux/of_mdio.h>
     17#include <linux/mdio.h>
     18#include <linux/phy.h>
     19#include <linux/phy/phy.h>
     20
     21#define BLK_ADDR_REG_OFFSET	0x1f
     22#define PLL_AFE1_100MHZ_BLK	0x2100
     23#define PLL_CLK_AMP_OFFSET	0x03
     24#define PLL_CLK_AMP_2P05V	0x2b18
     25
     26static int ns2_pci_phy_init(struct phy *p)
     27{
     28	struct mdio_device *mdiodev = phy_get_drvdata(p);
     29	int rc;
     30
     31	/* select the AFE 100MHz block page */
     32	rc = mdiodev_write(mdiodev, BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
     33	if (rc)
     34		goto err;
     35
     36	/* set the 100 MHz reference clock amplitude to 2.05 v */
     37	rc = mdiodev_write(mdiodev, PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
     38	if (rc)
     39		goto err;
     40
     41	return 0;
     42
     43err:
     44	dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
     45	return rc;
     46}
     47
     48static const struct phy_ops ns2_pci_phy_ops = {
     49	.init = ns2_pci_phy_init,
     50	.owner = THIS_MODULE,
     51};
     52
     53static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
     54{
     55	struct device *dev = &mdiodev->dev;
     56	struct phy_provider *provider;
     57	struct phy *phy;
     58
     59	phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
     60	if (IS_ERR(phy)) {
     61		dev_err(dev, "failed to create Phy\n");
     62		return PTR_ERR(phy);
     63	}
     64
     65	phy_set_drvdata(phy, mdiodev);
     66
     67	provider = devm_of_phy_provider_register(&phy->dev,
     68						 of_phy_simple_xlate);
     69	if (IS_ERR(provider)) {
     70		dev_err(dev, "failed to register Phy provider\n");
     71		return PTR_ERR(provider);
     72	}
     73
     74	dev_info(dev, "%s PHY registered\n", dev_name(dev));
     75
     76	return 0;
     77}
     78
     79static const struct of_device_id ns2_pci_phy_of_match[] = {
     80	{ .compatible = "brcm,ns2-pcie-phy", },
     81	{ /* sentinel */ },
     82};
     83MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
     84
     85static struct mdio_driver ns2_pci_phy_driver = {
     86	.mdiodrv = {
     87		.driver = {
     88			.name = "phy-bcm-ns2-pci",
     89			.of_match_table = ns2_pci_phy_of_match,
     90		},
     91	},
     92	.probe = ns2_pci_phy_probe,
     93};
     94mdio_module_driver(ns2_pci_phy_driver);
     95
     96MODULE_AUTHOR("Broadcom");
     97MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
     98MODULE_LICENSE("GPL v2");
     99MODULE_ALIAS("platform:phy-bcm-ns2-pci");