LXR linux/drivers/phy/broadcom/phy-bcm-ns2-pcie.c

   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 = mdiobus_write(mdiodev->bus, mdiodev->addr,
  33                           BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
  34        if (rc)
  35                goto err;
  36
  37        /* set the 100 MHz reference clock amplitude to 2.05 v */
  38        rc = mdiobus_write(mdiodev->bus, mdiodev->addr,
  39                           PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
  40        if (rc)
  41                goto err;
  42
  43        return 0;
  44
  45err:
  46        dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
  47        return rc;
  48}
  49
  50static const struct phy_ops ns2_pci_phy_ops = {
  51        .init = ns2_pci_phy_init,
  52        .owner = THIS_MODULE,
  53};
  54
  55static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
  56{
  57        struct device *dev = &mdiodev->dev;
  58        struct phy_provider *provider;
  59        struct phy *phy;
  60
  61        phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
  62        if (IS_ERR(phy)) {
  63                dev_err(dev, "failed to create Phy\n");
  64                return PTR_ERR(phy);
  65        }
  66
  67        phy_set_drvdata(phy, mdiodev);
  68
  69        provider = devm_of_phy_provider_register(&phy->dev,
  70                                                 of_phy_simple_xlate);
  71        if (IS_ERR(provider)) {
  72                dev_err(dev, "failed to register Phy provider\n");
  73                return PTR_ERR(provider);
  74        }
  75
  76        dev_info(dev, "%s PHY registered\n", dev_name(dev));
  77
  78        return 0;
  79}
  80
  81static const struct of_device_id ns2_pci_phy_of_match[] = {
  82        { .compatible = "brcm,ns2-pcie-phy", },
  83        { /* sentinel */ },
  84};
  85MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
  86
  87static struct mdio_driver ns2_pci_phy_driver = {
  88        .mdiodrv = {
  89                .driver = {
  90                        .name = "phy-bcm-ns2-pci",
  91                        .of_match_table = ns2_pci_phy_of_match,
  92                },
  93        },
  94        .probe = ns2_pci_phy_probe,
  95};
  96mdio_module_driver(ns2_pci_phy_driver);
  97
  98MODULE_AUTHOR("Broadcom");
  99MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
 100MODULE_LICENSE("GPL v2");
 101MODULE_ALIAS("platform:phy-bcm-ns2-pci");
 102