drivers/net/phy/microchip_t1.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2018 Microchip Technology
   3
   4 #include <linux/kernel.h>
   5 #include <linux/module.h>
   6 #include <linux/mii.h>
   7 #include <linux/phy.h>
   8
   9 /* Interrupt Source Register */
  10 #define LAN87XX_INTERRUPT_SOURCE                (0x18)
  11
  12 /* Interrupt Mask Register */
  13 #define LAN87XX_INTERRUPT_MASK                  (0x19)
  14 #define LAN87XX_MASK_LINK_UP                    (0x0004)
  15 #define LAN87XX_MASK_LINK_DOWN                  (0x0002)
  16
  17 #define DRIVER_AUTHOR   "Nisar Sayed <nisar.sayed@microchip.com>"
  18 #define DRIVER_DESC     "Microchip LAN87XX T1 PHY driver"
  19
  20 static int lan87xx_phy_config_intr(struct phy_device *phydev)
  21 {
  22         int rc, val = 0;
  23
  24         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  25                 /* unmask all source and clear them before enable */
  26                 rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, 0x7FFF);
  27                 rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
  28                 val = LAN87XX_MASK_LINK_UP | LAN87XX_MASK_LINK_DOWN;
  29         }
  30
  31         rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, val);
  32
  33         return rc < 0 ? rc : 0;
  34 }
  35
  36 static int lan87xx_phy_ack_interrupt(struct phy_device *phydev)
  37 {
  38         int rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
  39
  40         return rc < 0 ? rc : 0;
  41 }
  42
  43 static struct phy_driver microchip_t1_phy_driver[] = {
  44         {
  45                 .phy_id         = 0x0007c150,
  46                 .phy_id_mask    = 0xfffffff0,
  47                 .name           = "Microchip LAN87xx T1",
  48
  49                 .features       = PHY_BASIC_T1_FEATURES,
  50                 .flags          = PHY_HAS_INTERRUPT,
  51
  52                 .config_init    = genphy_config_init,
  53                 .config_aneg    = genphy_config_aneg,
  54
  55                 .ack_interrupt  = lan87xx_phy_ack_interrupt,
  56                 .config_intr    = lan87xx_phy_config_intr,
  57
  58                 .suspend        = genphy_suspend,
  59                 .resume         = genphy_resume,
  60         }
  61 };
  62
  63 module_phy_driver(microchip_t1_phy_driver);
  64
  65 static struct mdio_device_id __maybe_unused microchip_t1_tbl[] = {
  66         { 0x0007c150, 0xfffffff0 },
  67         { }
  68 };
  69
  70 MODULE_DEVICE_TABLE(mdio, microchip_t1_tbl);
  71
  72 MODULE_AUTHOR(DRIVER_AUTHOR);
  73 MODULE_DESCRIPTION(DRIVER_DESC);
  74 MODULE_LICENSE("GPL");