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/*
 * drivers/net/phy/davicom.c
 *
 * Driver for Davicom PHYs
 *
 * Author: Andy Fleming
 *
 * Copyright (c) 2004 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/slab.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 <asm/uaccess.h>
 
#define MII_DM9161_SCR		0x10
#define MII_DM9161_SCR_INIT	0x0610
 
/* 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)
 
/* 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");
 
 
#define DM9161_DELAY 1
static int dm9161_config_intr(struct phy_device *phydev)
{
	int temp;
 
	temp = phy_read(phydev, MII_DM9161_INTR);
 
	if (temp < 0)
		return temp;
 
	if(PHY_INTERRUPT_ENABLED == phydev->interrupts )
		temp &= ~(MII_DM9161_INTR_STOP);
	else
		temp |= MII_DM9161_INTR_STOP;
 
	temp = phy_write(phydev, MII_DM9161_INTR, temp);
 
	return temp;
}
 
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;
 
	/* Isolate the PHY */
	err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
 
	if (err < 0)
		return err;
 
	/* Do not bypass the scrambler/descrambler */
	err = phy_write(phydev, MII_DM9161_SCR, MII_DM9161_SCR_INIT);
 
	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 */
	err = phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
 
	if (err < 0)
		return err;
 
	return 0;
}
 
static int dm9161_ack_interrupt(struct phy_device *phydev)
{
	int err = phy_read(phydev, MII_DM9161_INTR);
 
	return (err < 0) ? err : 0;
}
 
static struct phy_driver dm9161e_driver = {
	.phy_id		= 0x0181b880,
	.name		= "Davicom DM9161E",
	.phy_id_mask	= 0x0ffffff0,
	.features	= PHY_BASIC_FEATURES,
	.config_init	= dm9161_config_init,
	.config_aneg	= dm9161_config_aneg,
	.read_status	= genphy_read_status,
	.driver		= { .owner = THIS_MODULE,},
};
 
static struct phy_driver dm9161a_driver = {
	.phy_id		= 0x0181b8a0,
	.name		= "Davicom DM9161A",
	.phy_id_mask	= 0x0ffffff0,
	.features	= PHY_BASIC_FEATURES,
	.config_init	= dm9161_config_init,
	.config_aneg	= dm9161_config_aneg,
	.read_status	= genphy_read_status,
	.driver		= { .owner = THIS_MODULE,},
};
 
static struct phy_driver dm9131_driver = {
	.phy_id		= 0x00181b80,
	.name		= "Davicom DM9131",
	.phy_id_mask	= 0x0ffffff0,
	.features	= PHY_BASIC_FEATURES,
	.flags		= PHY_HAS_INTERRUPT,
	.config_aneg	= genphy_config_aneg,
	.read_status	= genphy_read_status,
	.ack_interrupt	= dm9161_ack_interrupt,
	.config_intr	= dm9161_config_intr,
	.driver		= { .owner = THIS_MODULE,},
};
 
static int __init davicom_init(void)
{
	int ret;
 
	ret = phy_driver_register(&dm9161e_driver);
	if (ret)
		goto err1;
 
	ret = phy_driver_register(&dm9161a_driver);
	if (ret)
		goto err2;
 
	ret = phy_driver_register(&dm9131_driver);
	if (ret)
		goto err3;
	return 0;
 
 err3:
	phy_driver_unregister(&dm9161a_driver);
 err2:
	phy_driver_unregister(&dm9161e_driver);
 err1:
	return ret;
}
 
static void __exit davicom_exit(void)
{
	phy_driver_unregister(&dm9161e_driver);
	phy_driver_unregister(&dm9161a_driver);
	phy_driver_unregister(&dm9131_driver);
}
 
module_init(davicom_init);
module_exit(davicom_exit);