LXR linux/drivers/net/phy/ax88796b.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/* Driver for Asix PHYs
   3 *
   4 * Author: Michael Schmitz <schmitzmic@gmail.com>
   5 */
   6#include <linux/kernel.h>
   7#include <linux/errno.h>
   8#include <linux/init.h>
   9#include <linux/module.h>
  10#include <linux/mii.h>
  11#include <linux/phy.h>
  12
  13#define PHY_ID_ASIX_AX88796B            0x003b1841
  14
  15MODULE_DESCRIPTION("Asix PHY driver");
  16MODULE_AUTHOR("Michael Schmitz <schmitzmic@gmail.com>");
  17MODULE_LICENSE("GPL");
  18
  19/**
  20 * asix_soft_reset - software reset the PHY via BMCR_RESET bit
  21 * @phydev: target phy_device struct
  22 *
  23 * Description: Perform a software PHY reset using the standard
  24 * BMCR_RESET bit and poll for the reset bit to be cleared.
  25 * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
  26 * such as used on the Individual Computers' X-Surf 100 Zorro card.
  27 *
  28 * Returns: 0 on success, < 0 on failure
  29 */
  30static int asix_soft_reset(struct phy_device *phydev)
  31{
  32        int ret;
  33
  34        /* Asix PHY won't reset unless reset bit toggles */
  35        ret = phy_write(phydev, MII_BMCR, 0);
  36        if (ret < 0)
  37                return ret;
  38
  39        return genphy_soft_reset(phydev);
  40}
  41
  42static struct phy_driver asix_driver[] = { {
  43        .phy_id         = PHY_ID_ASIX_AX88796B,
  44        .name           = "Asix Electronics AX88796B",
  45        .phy_id_mask    = 0xfffffff0,
  46        /* PHY_BASIC_FEATURES */
  47        .soft_reset     = asix_soft_reset,
  48} };
  49
  50module_phy_driver(asix_driver);
  51
  52static struct mdio_device_id __maybe_unused asix_tbl[] = {
  53        { PHY_ID_ASIX_AX88796B, 0xfffffff0 },
  54        { }
  55};
  56
  57MODULE_DEVICE_TABLE(mdio, asix_tbl);
  58