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