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// SPDX-License-Identifier: GPL-2.0+
/*
* drivers/net/phy/davicom.c
*
* Driver for Davicom PHYs
*
* Author: Andy Fleming
*
* Copyright (c) 2004 Freescale Semiconductor, Inc.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
#define MII_DM9161_SCR 0x10
#define MII_DM9161_SCR_INIT 0x0610
#define MII_DM9161_SCR_RMII 0x0100
/* DM9161 Interrupt Register */
#define MII_DM9161_INTR 0x15
#define MII_DM9161_INTR_PEND 0x8000
#define MII_DM9161_INTR_DPLX_MASK 0x0800
#define MII_DM9161_INTR_SPD_MASK 0x0400
#define MII_DM9161_INTR_LINK_MASK 0x0200
#define MII_DM9161_INTR_MASK 0x0100
#define MII_DM9161_INTR_DPLX_CHANGE 0x0010
#define MII_DM9161_INTR_SPD_CHANGE 0x0008
#define MII_DM9161_INTR_LINK_CHANGE 0x0004
#define MII_DM9161_INTR_INIT 0x0000
#define MII_DM9161_INTR_STOP \
(MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK | \
MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK)
#define MII_DM9161_INTR_CHANGE \
(MII_DM9161_INTR_DPLX_CHANGE | \
MII_DM9161_INTR_SPD_CHANGE | \
MII_DM9161_INTR_LINK_CHANGE)
/* DM9161 10BT Configuration/Status */
#define MII_DM9161_10BTCSR 0x12
#define MII_DM9161_10BTCSR_INIT 0x7800
MODULE_DESCRIPTION("Davicom PHY driver");
MODULE_AUTHOR("Andy Fleming");
MODULE_LICENSE("GPL");
static int dm9161_ack_interrupt(struct phy_device *phydev)
{
int err = phy_read(phydev, MII_DM9161_INTR);
return (err < 0) ? err : 0;
}
#define DM9161_DELAY 1
static int dm9161_config_intr(struct phy_device *phydev)
{
int temp, err;
temp = phy_read(phydev, MII_DM9161_INTR);
if (temp < 0)
return temp;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
err = dm9161_ack_interrupt(phydev);
if (err)
return err;
temp &= ~(MII_DM9161_INTR_STOP);
err = phy_write(phydev, MII_DM9161_INTR, temp);
} else {
temp |= MII_DM9161_INTR_STOP;
err = phy_write(phydev, MII_DM9161_INTR, temp);
if (err)
return err;
err = dm9161_ack_interrupt(phydev);
}
return err;
}
static irqreturn_t dm9161_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read(phydev, MII_DM9161_INTR);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & MII_DM9161_INTR_CHANGE))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int dm9161_config_aneg(struct phy_device *phydev)
{
int err;
/* Isolate the PHY */
err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
if (err < 0)
return err;
/* Configure the new settings */
err = genphy_config_aneg(phydev);
if (err < 0)
return err;
return 0;
}
static int dm9161_config_init(struct phy_device *phydev)
{
int err, temp;
/* Isolate the PHY */
err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
if (err < 0)
return err;
switch (phydev->interface) {
case PHY_INTERFACE_MODE_MII:
temp = MII_DM9161_SCR_INIT;
break;
case PHY_INTERFACE_MODE_RMII:
temp = MII_DM9161_SCR_INIT | MII_DM9161_SCR_RMII;
break;
default:
return -EINVAL;
}
/* Do not bypass the scrambler/descrambler */
err = phy_write(phydev, MII_DM9161_SCR, temp);
if (err < 0)
return err;
/* Clear 10BTCSR to default */
err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);
if (err < 0)
return err;
/* Reconnect the PHY, and enable Autonegotiation */
return phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
}
static struct phy_driver dm91xx_driver[] = {
{
.phy_id = 0x0181b880,
.name = "Davicom DM9161E",
.phy_id_mask = 0x0ffffff0,
/* PHY_BASIC_FEATURES */
.config_init = dm9161_config_init,
.config_aneg = dm9161_config_aneg,
.config_intr = dm9161_config_intr,
.handle_interrupt = dm9161_handle_interrupt,
}, {
.phy_id = 0x0181b8b0,
.name = "Davicom DM9161B/C",
.phy_id_mask = 0x0ffffff0,
/* PHY_BASIC_FEATURES */
.config_init = dm9161_config_init,
.config_aneg = dm9161_config_aneg,
.config_intr = dm9161_config_intr,
.handle_interrupt = dm9161_handle_interrupt,
}, {
.phy_id = 0x0181b8a0,
.name = "Davicom DM9161A",
.phy_id_mask = 0x0ffffff0,
/* PHY_BASIC_FEATURES */
.config_init = dm9161_config_init,
.config_aneg = dm9161_config_aneg,
.config_intr = dm9161_config_intr,
.handle_interrupt = dm9161_handle_interrupt,
}, {
.phy_id = 0x00181b80,
.name = "Davicom DM9131",
.phy_id_mask = 0x0ffffff0,
/* PHY_BASIC_FEATURES */
.config_intr = dm9161_config_intr,
.handle_interrupt = dm9161_handle_interrupt,
} };
module_phy_driver(dm91xx_driver);
static struct mdio_device_id __maybe_unused davicom_tbl[] = {
{ 0x0181b880, 0x0ffffff0 },
{ 0x0181b8b0, 0x0ffffff0 },
{ 0x0181b8a0, 0x0ffffff0 },
{ 0x00181b80, 0x0ffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, davicom_tbl);
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