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 TI_DP83848C_PHY_ID              0x20005ca0
  20 #define NS_DP83848C_PHY_ID              0x20005c90
  21 #define TLK10X_PHY_ID                   0x2000a210
  22
  23 /* Registers */
  24 #define DP83848_MICR                    0x11 /* MII Interrupt Control Register */
  25 #define DP83848_MISR                    0x12 /* MII Interrupt Status Register */
  26
  27 /* MICR Register Fields */
  28 #define DP83848_MICR_INT_OE             BIT(0) /* Interrupt Output Enable */
  29 #define DP83848_MICR_INTEN              BIT(1) /* Interrupt Enable */
  30
  31 /* MISR Register Fields */
  32 #define DP83848_MISR_RHF_INT_EN         BIT(0) /* Receive Error Counter */
  33 #define DP83848_MISR_FHF_INT_EN         BIT(1) /* False Carrier Counter */
  34 #define DP83848_MISR_ANC_INT_EN         BIT(2) /* Auto-negotiation complete */
  35 #define DP83848_MISR_DUP_INT_EN         BIT(3) /* Duplex Status */
  36 #define DP83848_MISR_SPD_INT_EN         BIT(4) /* Speed status */
  37 #define DP83848_MISR_LINK_INT_EN        BIT(5) /* Link status */
  38 #define DP83848_MISR_ED_INT_EN          BIT(6) /* Energy detect */
  39 #define DP83848_MISR_LQM_INT_EN         BIT(7) /* Link Quality Monitor */
  40
  41 #define DP83848_INT_EN_MASK             \
  42         (DP83848_MISR_ANC_INT_EN |      \
  43          DP83848_MISR_DUP_INT_EN |      \
  44          DP83848_MISR_SPD_INT_EN |      \
  45          DP83848_MISR_LINK_INT_EN)
  46
  47 static int dp83848_ack_interrupt(struct phy_device *phydev)
  48 {
  49         int err = phy_read(phydev, DP83848_MISR);
  50
  51         return err < 0 ? err : 0;
  52 }
  53
  54 static int dp83848_config_intr(struct phy_device *phydev)
  55 {
  56         int control, ret;
  57
  58         control = phy_read(phydev, DP83848_MICR);
  59         if (control < 0)
  60                 return control;
  61
  62         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  63                 control |= DP83848_MICR_INT_OE;
  64                 control |= DP83848_MICR_INTEN;
  65
  66                 ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
  67                 if (ret < 0)
  68                         return ret;
  69         } else {
  70                 control &= ~DP83848_MICR_INTEN;
  71         }
  72
  73         return phy_write(phydev, DP83848_MICR, control);
  74 }
  75
  76 static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
  77         { TI_DP83848C_PHY_ID, 0xfffffff0 },
  78         { NS_DP83848C_PHY_ID, 0xfffffff0 },
  79         { TLK10X_PHY_ID, 0xfffffff0 },
  80         { }
  81 };
  82 MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
  83
  84 #define DP83848_PHY_DRIVER(_id, _name)                          \
  85         {                                                       \
  86                 .phy_id         = _id,                          \
  87                 .phy_id_mask    = 0xfffffff0,                   \
  88                 .name           = _name,                        \
  89                 .features       = PHY_BASIC_FEATURES,           \
  90                 .flags          = PHY_HAS_INTERRUPT,            \
  91                                                                 \
  92                 .soft_reset     = genphy_soft_reset,            \
  93                 .config_init    = genphy_config_init,           \
  94                 .suspend        = genphy_suspend,               \
  95                 .resume         = genphy_resume,                \
  96                 .config_aneg    = genphy_config_aneg,           \
  97                 .read_status    = genphy_read_status,           \
  98                                                                 \
  99                 /* IRQ related */                               \
 100                 .ack_interrupt  = dp83848_ack_interrupt,        \
 101                 .config_intr    = dp83848_config_intr,          \
 102         }
 103
 104 static struct phy_driver dp83848_driver[] = {
 105         DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY"),
 106         DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY"),
 107         DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY"),
 108 };
 109 module_phy_driver(dp83848_driver);
 110
 111 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
 112 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
 113 MODULE_LICENSE("GPL");