drivers/phy/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
  26 static 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
  45 err:
  46         dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
  47         return rc;
  48 }
  49
  50 static const struct phy_ops ns2_pci_phy_ops = {
  51         .init = ns2_pci_phy_init,
  52         .owner = THIS_MODULE,
  53 };
  54
  55 static 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
  81 static const struct of_device_id ns2_pci_phy_of_match[] = {
  82         { .compatible = "brcm,ns2-pcie-phy", },
  83         { /* sentinel */ },
  84 };
  85 MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
  86
  87 static 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 };
  96 mdio_module_driver(ns2_pci_phy_driver);
  97
  98 MODULE_AUTHOR("Broadcom");
  99 MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
 100 MODULE_LICENSE("GPL v2");
 101 MODULE_ALIAS("platform:phy-bcm-ns2-pci");