drivers/net/phy/dp83848.c

   1 /*
   2  * Driver for the Texas Instruments DP83848 PHY
   3  *
   4  * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/phy.h>
  18
  19 #define DP83848_PHY_ID                  0x20005c90
  20
  21 /* Registers */
  22 #define DP83848_MICR                    0x11
  23 #define DP83848_MISR                    0x12
  24
  25 /* MICR Register Fields */
  26 #define DP83848_MICR_INT_OE             BIT(0) /* Interrupt Output Enable */
  27 #define DP83848_MICR_INTEN              BIT(1) /* Interrupt Enable */
  28
  29 /* MISR Register Fields */
  30 #define DP83848_MISR_RHF_INT_EN         BIT(0) /* Receive Error Counter */
  31 #define DP83848_MISR_FHF_INT_EN         BIT(1) /* False Carrier Counter */
  32 #define DP83848_MISR_ANC_INT_EN         BIT(2) /* Auto-negotiation complete */
  33 #define DP83848_MISR_DUP_INT_EN         BIT(3) /* Duplex Status */
  34 #define DP83848_MISR_SPD_INT_EN         BIT(4) /* Speed status */
  35 #define DP83848_MISR_LINK_INT_EN        BIT(5) /* Link status */
  36 #define DP83848_MISR_ED_INT_EN          BIT(6) /* Energy detect */
  37 #define DP83848_MISR_LQM_INT_EN         BIT(7) /* Link Quality Monitor */
  38
  39 static int dp83848_ack_interrupt(struct phy_device *phydev)
  40 {
  41         int err = phy_read(phydev, DP83848_MISR);
  42
  43         return err < 0 ? err : 0;
  44 }
  45
  46 static int dp83848_config_intr(struct phy_device *phydev)
  47 {
  48         int err;
  49
  50         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  51                 err = phy_write(phydev, DP83848_MICR,
  52                                 DP83848_MICR_INT_OE |
  53                                 DP83848_MICR_INTEN);
  54                 if (err < 0)
  55                         return err;
  56
  57                 return phy_write(phydev, DP83848_MISR,
  58                                  DP83848_MISR_ANC_INT_EN |
  59                                  DP83848_MISR_DUP_INT_EN |
  60                                  DP83848_MISR_SPD_INT_EN |
  61                                  DP83848_MISR_LINK_INT_EN);
  62         }
  63
  64         return phy_write(phydev, DP83848_MICR, 0x0);
  65 }
  66
  67 static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
  68         { DP83848_PHY_ID, 0xfffffff0 },
  69         { }
  70 };
  71 MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
  72
  73 #define DP83848_PHY_DRIVER(_id, _name)                          \
  74         {                                                       \
  75                 .phy_id         = _id,                          \
  76                 .phy_id_mask    = 0xfffffff0,                   \
  77                 .name           = _name,                        \
  78                 .features       = PHY_BASIC_FEATURES,           \
  79                 .flags          = PHY_HAS_INTERRUPT,            \
  80                                                                 \
  81                 .soft_reset     = genphy_soft_reset,            \
  82                 .config_init    = genphy_config_init,           \
  83                 .suspend        = genphy_suspend,               \
  84                 .resume         = genphy_resume,                \
  85                 .config_aneg    = genphy_config_aneg,           \
  86                 .read_status    = genphy_read_status,           \
  87                                                                 \
  88                 /* IRQ related */                               \
  89                 .ack_interrupt  = dp83848_ack_interrupt,        \
  90                 .config_intr    = dp83848_config_intr,          \
  91         }
  92
  93 static struct phy_driver dp83848_driver[] = {
  94         DP83848_PHY_DRIVER(DP83848_PHY_ID, "TI DP83848 10/100 Mbps PHY"),
  95 };
  96 module_phy_driver(dp83848_driver);
  97
  98 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
  99 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
 100 MODULE_LICENSE("GPL");