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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright (C) 2016 Broadcom
   3
   4 #include <linux/device.h>
   5 #include <linux/module.h>
   6 #include <linux/of_mdio.h>
   7 #include <linux/mdio.h>
   8 #include <linux/phy.h>
   9 #include <linux/phy/phy.h>
  10
  11 #define BLK_ADDR_REG_OFFSET     0x1f
  12 #define PLL_AFE1_100MHZ_BLK     0x2100
  13 #define PLL_CLK_AMP_OFFSET      0x03
  14 #define PLL_CLK_AMP_2P05V       0x2b18
  15
  16 static int ns2_pci_phy_init(struct phy *p)
  17 {
  18         struct mdio_device *mdiodev = phy_get_drvdata(p);
  19         int rc;
  20
  21         /* select the AFE 100MHz block page */
  22         rc = mdiodev_write(mdiodev, BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
  23         if (rc)
  24                 goto err;
  25
  26         /* set the 100 MHz reference clock amplitude to 2.05 v */
  27         rc = mdiodev_write(mdiodev, PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
  28         if (rc)
  29                 goto err;
  30
  31         return 0;
  32
  33 err:
  34         dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
  35         return rc;
  36 }
  37
  38 static const struct phy_ops ns2_pci_phy_ops = {
  39         .init = ns2_pci_phy_init,
  40         .owner = THIS_MODULE,
  41 };
  42
  43 static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
  44 {
  45         struct device *dev = &mdiodev->dev;
  46         struct phy_provider *provider;
  47         struct phy *phy;
  48
  49         phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
  50         if (IS_ERR(phy)) {
  51                 dev_err(dev, "failed to create Phy\n");
  52                 return PTR_ERR(phy);
  53         }
  54
  55         phy_set_drvdata(phy, mdiodev);
  56
  57         provider = devm_of_phy_provider_register(&phy->dev,
  58                                                  of_phy_simple_xlate);
  59         if (IS_ERR(provider)) {
  60                 dev_err(dev, "failed to register Phy provider\n");
  61                 return PTR_ERR(provider);
  62         }
  63
  64         dev_info(dev, "%s PHY registered\n", dev_name(dev));
  65
  66         return 0;
  67 }
  68
  69 static const struct of_device_id ns2_pci_phy_of_match[] = {
  70         { .compatible = "brcm,ns2-pcie-phy", },
  71         { /* sentinel */ },
  72 };
  73 MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
  74
  75 static struct mdio_driver ns2_pci_phy_driver = {
  76         .mdiodrv = {
  77                 .driver = {
  78                         .name = "phy-bcm-ns2-pci",
  79                         .of_match_table = ns2_pci_phy_of_match,
  80                 },
  81         },
  82         .probe = ns2_pci_phy_probe,
  83 };
  84 mdio_module_driver(ns2_pci_phy_driver);
  85
  86 MODULE_AUTHOR("Broadcom");
  87 MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
  88 MODULE_LICENSE("GPL v2");
  89 MODULE_ALIAS("platform:phy-bcm-ns2-pci");