108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for AMD am79c PHYs
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*
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* Author: Heiko Schocher <hs@denx.de>
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*
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* Copyright (c) 2011 DENX Software Engineering GmbH
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mii.h>
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#include <linux/phy.h>
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#define PHY_ID_AM79C874 0x0022561b
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#define MII_AM79C_IR 17 /* Interrupt Status/Control Register */
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#define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */
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#define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */
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#define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG)
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#define MII_AM79C_IR_LINK_DOWN BIT(2)
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#define MII_AM79C_IR_ANEG_DONE BIT(0)
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#define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE)
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MODULE_DESCRIPTION("AMD PHY driver");
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MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");
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MODULE_LICENSE("GPL");
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static int am79c_ack_interrupt(struct phy_device *phydev)
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{
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int err;
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err = phy_read(phydev, MII_BMSR);
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if (err < 0)
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return err;
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err = phy_read(phydev, MII_AM79C_IR);
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if (err < 0)
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return err;
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return 0;
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}
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static int am79c_config_init(struct phy_device *phydev)
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{
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return 0;
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}
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static int am79c_config_intr(struct phy_device *phydev)
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{
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int err;
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
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err = am79c_ack_interrupt(phydev);
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if (err)
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return err;
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err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT);
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} else {
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err = phy_write(phydev, MII_AM79C_IR, 0);
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if (err)
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return err;
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err = am79c_ack_interrupt(phydev);
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}
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return err;
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}
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static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev)
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{
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int irq_status;
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irq_status = phy_read(phydev, MII_AM79C_IR);
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if (irq_status < 0) {
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phy_error(phydev);
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return IRQ_NONE;
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}
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if (!(irq_status & MII_AM79C_IR_IMASK_STAT))
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return IRQ_NONE;
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phy_trigger_machine(phydev);
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return IRQ_HANDLED;
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}
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static struct phy_driver am79c_driver[] = { {
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.phy_id = PHY_ID_AM79C874,
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.name = "AM79C874",
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.phy_id_mask = 0xfffffff0,
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/* PHY_BASIC_FEATURES */
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.config_init = am79c_config_init,
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.config_intr = am79c_config_intr,
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.handle_interrupt = am79c_handle_interrupt,
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} };
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module_phy_driver(am79c_driver);
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static struct mdio_device_id __maybe_unused amd_tbl[] = {
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{ PHY_ID_AM79C874, 0xfffffff0 },
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{ }
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};
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MODULE_DEVICE_TABLE(mdio, amd_tbl);
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