drivers/net/phy/ste10Xp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * drivers/net/phy/ste10Xp.c
   4  *
   5  * Driver for STMicroelectronics STe10Xp PHYs
   6  *
   7  * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
   8  *
   9  * Copyright (c) 2008 STMicroelectronics Limited
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/ethtool.h>
  20 #include <linux/mii.h>
  21 #include <linux/phy.h>
  22
  23 #define MII_XCIIS       0x11    /* Configuration Info IRQ & Status Reg */
  24 #define MII_XIE         0x12    /* Interrupt Enable Register */
  25 #define MII_XIE_DEFAULT_MASK 0x0070 /* ANE complete, Remote Fault, Link Down */
  26
  27 #define STE101P_PHY_ID          0x00061c50
  28 #define STE100P_PHY_ID          0x1c040011
  29
  30 static int ste10Xp_config_init(struct phy_device *phydev)
  31 {
  32         int value, err;
  33
  34         /* Software Reset PHY */
  35         value = phy_read(phydev, MII_BMCR);
  36         if (value < 0)
  37                 return value;
  38
  39         value |= BMCR_RESET;
  40         err = phy_write(phydev, MII_BMCR, value);
  41         if (err < 0)
  42                 return err;
  43
  44         do {
  45                 value = phy_read(phydev, MII_BMCR);
  46         } while (value & BMCR_RESET);
  47
  48         return 0;
  49 }
  50
  51 static int ste10Xp_ack_interrupt(struct phy_device *phydev)
  52 {
  53         int err = phy_read(phydev, MII_XCIIS);
  54
  55         if (err < 0)
  56                 return err;
  57
  58         return 0;
  59 }
  60
  61 static int ste10Xp_config_intr(struct phy_device *phydev)
  62 {
  63         int err;
  64
  65         if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
  66                 /* clear any pending interrupts */
  67                 err = ste10Xp_ack_interrupt(phydev);
  68                 if (err)
  69                         return err;
  70
  71                 /* Enable all STe101P interrupts (PR12) */
  72                 err = phy_write(phydev, MII_XIE, MII_XIE_DEFAULT_MASK);
  73         } else {
  74                 err = phy_write(phydev, MII_XIE, 0);
  75                 if (err)
  76                         return err;
  77
  78                 err = ste10Xp_ack_interrupt(phydev);
  79         }
  80
  81         return err;
  82 }
  83
  84 static irqreturn_t ste10Xp_handle_interrupt(struct phy_device *phydev)
  85 {
  86         int irq_status;
  87
  88         irq_status = phy_read(phydev, MII_XCIIS);
  89         if (irq_status < 0) {
  90                 phy_error(phydev);
  91                 return IRQ_NONE;
  92         }
  93
  94         if (!(irq_status & MII_XIE_DEFAULT_MASK))
  95                 return IRQ_NONE;
  96
  97         phy_trigger_machine(phydev);
  98
  99         return IRQ_HANDLED;
 100 }
 101
 102 static struct phy_driver ste10xp_pdriver[] = {
 103 {
 104         .phy_id = STE101P_PHY_ID,
 105         .phy_id_mask = 0xfffffff0,
 106         .name = "STe101p",
 107         /* PHY_BASIC_FEATURES */
 108         .config_init = ste10Xp_config_init,
 109         .config_intr = ste10Xp_config_intr,
 110         .handle_interrupt = ste10Xp_handle_interrupt,
 111         .suspend = genphy_suspend,
 112         .resume = genphy_resume,
 113 }, {
 114         .phy_id = STE100P_PHY_ID,
 115         .phy_id_mask = 0xffffffff,
 116         .name = "STe100p",
 117         /* PHY_BASIC_FEATURES */
 118         .config_init = ste10Xp_config_init,
 119         .config_intr = ste10Xp_config_intr,
 120         .handle_interrupt = ste10Xp_handle_interrupt,
 121         .suspend = genphy_suspend,
 122         .resume = genphy_resume,
 123 } };
 124
 125 module_phy_driver(ste10xp_pdriver);
 126
 127 static struct mdio_device_id __maybe_unused ste10Xp_tbl[] = {
 128         { STE101P_PHY_ID, 0xfffffff0 },
 129         { STE100P_PHY_ID, 0xffffffff },
 130         { }
 131 };
 132
 133 MODULE_DEVICE_TABLE(mdio, ste10Xp_tbl);
 134
 135 MODULE_DESCRIPTION("STMicroelectronics STe10Xp PHY driver");
 136 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
 137 MODULE_LICENSE("GPL");