LXR linux/drivers/net/phy/dp83848.c

   1/*
   2 * Driver for the Texas Instruments DP83848 PHY
   3 *
   4 * Copyright (C) 2015 Texas Instruments Inc.
   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
  39static 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
  46static 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
  67static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
  68        { DP83848_PHY_ID, 0xfffffff0 },
  69        { }
  70};
  71MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
  72
  73static struct phy_driver dp83848_driver[] = {
  74        {
  75                .phy_id         = DP83848_PHY_ID,
  76                .phy_id_mask    = 0xfffffff0,
  77                .name           = "TI DP83848",
  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                .driver         = { .owner = THIS_MODULE, },
  93        },
  94};
  95module_phy_driver(dp83848_driver);
  96
  97MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
  98MODULE_AUTHOR("Andrew F. Davis <afd@ti.com");
  99MODULE_LICENSE("GPL");
 100