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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Driver for AMD am79c PHYs
- *
- * Author: Heiko Schocher <[email protected]>
- *
- * 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 <[email protected]>");
- 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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