drivers/net/phy/mdio-octeon.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2009-2015 Cavium, Inc.
   7  */
   8
   9 #include <linux/platform_device.h>
  10 #include <linux/of_address.h>
  11 #include <linux/of_mdio.h>
  12 #include <linux/module.h>
  13 #include <linux/gfp.h>
  14 #include <linux/phy.h>
  15 #include <linux/io.h>
  16
  17 #include "mdio-cavium.h"
  18
  19 static int octeon_mdiobus_probe(struct platform_device *pdev)
  20 {
  21         struct cavium_mdiobus *bus;
  22         struct mii_bus *mii_bus;
  23         struct resource *res_mem;
  24         resource_size_t mdio_phys;
  25         resource_size_t regsize;
  26         union cvmx_smix_en smi_en;
  27         int err = -ENOENT;
  28
  29         mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
  30         if (!mii_bus)
  31                 return -ENOMEM;
  32
  33         res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  34         if (res_mem == NULL) {
  35                 dev_err(&pdev->dev, "found no memory resource\n");
  36                 return -ENXIO;
  37         }
  38
  39         bus = mii_bus->priv;
  40         bus->mii_bus = mii_bus;
  41         mdio_phys = res_mem->start;
  42         regsize = resource_size(res_mem);
  43
  44         if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
  45                                      res_mem->name)) {
  46                 dev_err(&pdev->dev, "request_mem_region failed\n");
  47                 return -ENXIO;
  48         }
  49
  50         bus->register_base =
  51                 (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
  52         if (!bus->register_base) {
  53                 dev_err(&pdev->dev, "dev_ioremap failed\n");
  54                 return -ENOMEM;
  55         }
  56
  57         smi_en.u64 = 0;
  58         smi_en.s.en = 1;
  59         oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  60
  61         bus->mii_bus->name = KBUILD_MODNAME;
  62         snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
  63         bus->mii_bus->parent = &pdev->dev;
  64
  65         bus->mii_bus->read = cavium_mdiobus_read;
  66         bus->mii_bus->write = cavium_mdiobus_write;
  67
  68         platform_set_drvdata(pdev, bus);
  69
  70         err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
  71         if (err)
  72                 goto fail_register;
  73
  74         dev_info(&pdev->dev, "Probed\n");
  75
  76         return 0;
  77 fail_register:
  78         mdiobus_free(bus->mii_bus);
  79         smi_en.u64 = 0;
  80         oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  81         return err;
  82 }
  83
  84 static int octeon_mdiobus_remove(struct platform_device *pdev)
  85 {
  86         struct cavium_mdiobus *bus;
  87         union cvmx_smix_en smi_en;
  88
  89         bus = platform_get_drvdata(pdev);
  90
  91         mdiobus_unregister(bus->mii_bus);
  92         mdiobus_free(bus->mii_bus);
  93         smi_en.u64 = 0;
  94         oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
  95         return 0;
  96 }
  97
  98 static const struct of_device_id octeon_mdiobus_match[] = {
  99         {
 100                 .compatible = "cavium,octeon-3860-mdio",
 101         },
 102         {},
 103 };
 104 MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
 105
 106 static struct platform_driver octeon_mdiobus_driver = {
 107         .driver = {
 108                 .name           = KBUILD_MODNAME,
 109                 .of_match_table = octeon_mdiobus_match,
 110         },
 111         .probe          = octeon_mdiobus_probe,
 112         .remove         = octeon_mdiobus_remove,
 113 };
 114
 115 void octeon_mdiobus_force_mod_depencency(void)
 116 {
 117         /* Let ethernet drivers force us to be loaded.  */
 118 }
 119 EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
 120
 121 module_platform_driver(octeon_mdiobus_driver);
 122
 123 MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
 124 MODULE_AUTHOR("David Daney");
 125 MODULE_LICENSE("GPL");