net/phy/ste10Xp.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * drivers/net/phy/ste10Xp.c
0004  *
0005  * Driver for STMicroelectronics STe10Xp PHYs
0006  *
0007  * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
0008  *
0009  * Copyright (c) 2008 STMicroelectronics Limited
0010  */
0011
0012 #include <linux/module.h>
0013 #include <linux/init.h>
0014 #include <linux/sched.h>
0015 #include <linux/kernel.h>
0016 #include <linux/moduleparam.h>
0017 #include <linux/interrupt.h>
0018 #include <linux/netdevice.h>
0019 #include <linux/ethtool.h>
0020 #include <linux/mii.h>
0021 #include <linux/phy.h>
0022
0023 #define MII_XCIIS   0x11    /* Configuration Info IRQ & Status Reg */
0024 #define MII_XIE     0x12    /* Interrupt Enable Register */
0025 #define MII_XIE_DEFAULT_MASK 0x0070 /* ANE complete, Remote Fault, Link Down */
0026
0027 #define STE101P_PHY_ID      0x00061c50
0028 #define STE100P_PHY_ID      0x1c040011
0029
0030 static int ste10Xp_config_init(struct phy_device *phydev)
0031 {
0032     int value, err;
0033
0034     /* Software Reset PHY */
0035     value = phy_read(phydev, MII_BMCR);
0036     if (value < 0)
0037         return value;
0038
0039     value |= BMCR_RESET;
0040     err = phy_write(phydev, MII_BMCR, value);
0041     if (err < 0)
0042         return err;
0043
0044     do {
0045         value = phy_read(phydev, MII_BMCR);
0046     } while (value & BMCR_RESET);
0047
0048     return 0;
0049 }
0050
0051 static int ste10Xp_ack_interrupt(struct phy_device *phydev)
0052 {
0053     int err = phy_read(phydev, MII_XCIIS);
0054
0055     if (err < 0)
0056         return err;
0057
0058     return 0;
0059 }
0060
0061 static int ste10Xp_config_intr(struct phy_device *phydev)
0062 {
0063     int err;
0064
0065     if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
0066         /* clear any pending interrupts */
0067         err = ste10Xp_ack_interrupt(phydev);
0068         if (err)
0069             return err;
0070
0071         /* Enable all STe101P interrupts (PR12) */
0072         err = phy_write(phydev, MII_XIE, MII_XIE_DEFAULT_MASK);
0073     } else {
0074         err = phy_write(phydev, MII_XIE, 0);
0075         if (err)
0076             return err;
0077
0078         err = ste10Xp_ack_interrupt(phydev);
0079     }
0080
0081     return err;
0082 }
0083
0084 static irqreturn_t ste10Xp_handle_interrupt(struct phy_device *phydev)
0085 {
0086     int irq_status;
0087
0088     irq_status = phy_read(phydev, MII_XCIIS);
0089     if (irq_status < 0) {
0090         phy_error(phydev);
0091         return IRQ_NONE;
0092     }
0093
0094     if (!(irq_status & MII_XIE_DEFAULT_MASK))
0095         return IRQ_NONE;
0096
0097     phy_trigger_machine(phydev);
0098
0099     return IRQ_HANDLED;
0100 }
0101
0102 static struct phy_driver ste10xp_pdriver[] = {
0103 {
0104     .phy_id = STE101P_PHY_ID,
0105     .phy_id_mask = 0xfffffff0,
0106     .name = "STe101p",
0107     /* PHY_BASIC_FEATURES */
0108     .config_init = ste10Xp_config_init,
0109     .config_intr = ste10Xp_config_intr,
0110     .handle_interrupt = ste10Xp_handle_interrupt,
0111     .suspend = genphy_suspend,
0112     .resume = genphy_resume,
0113 }, {
0114     .phy_id = STE100P_PHY_ID,
0115     .phy_id_mask = 0xffffffff,
0116     .name = "STe100p",
0117     /* PHY_BASIC_FEATURES */
0118     .config_init = ste10Xp_config_init,
0119     .config_intr = ste10Xp_config_intr,
0120     .handle_interrupt = ste10Xp_handle_interrupt,
0121     .suspend = genphy_suspend,
0122     .resume = genphy_resume,
0123 } };
0124
0125 module_phy_driver(ste10xp_pdriver);
0126
0127 static struct mdio_device_id __maybe_unused ste10Xp_tbl[] = {
0128     { STE101P_PHY_ID, 0xfffffff0 },
0129     { STE100P_PHY_ID, 0xffffffff },
0130     { }
0131 };
0132
0133 MODULE_DEVICE_TABLE(mdio, ste10Xp_tbl);
0134
0135 MODULE_DESCRIPTION("STMicroelectronics STe10Xp PHY driver");
0136 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
0137 MODULE_LICENSE("GPL");