gianfar_phy.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 662 行 · 第 1/2 页

/* 
 * drivers/net/gianfar_phy.c
 *
 * Gianfar Ethernet Driver -- PHY handling
 * Driver for FEC on MPC8540 and TSEC on MPC8540/MPC8560
 * Based on 8260_io/fcc_enet.c
 *
 * Author: Andy Fleming
 * Maintainer: Kumar Gala ([e-mail])
 *
 * Copyright (c) 2002-2004 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/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/errno.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 <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/crc32.h>
#include <linux/mii.h>

#include "gianfar.h"
#include "gianfar_phy.h"

static void config_genmii_advert(struct gfar_mii_info *mii_info);
static void genmii_setup_forced(struct gfar_mii_info *mii_info);
static void genmii_restart_aneg(struct gfar_mii_info *mii_info);
static int gbit_config_aneg(struct gfar_mii_info *mii_info);
static int genmii_config_aneg(struct gfar_mii_info *mii_info);
static int genmii_update_link(struct gfar_mii_info *mii_info);
static int genmii_read_status(struct gfar_mii_info *mii_info);
u16 phy_read(struct gfar_mii_info *mii_info, u16 regnum);
void phy_write(struct gfar_mii_info *mii_info, u16 regnum, u16 val);

/* Write value to the PHY for this device to the register at regnum, */
/* waiting until the write is done before it returns.  All PHY */
/* configuration has to be done through the TSEC1 MIIM regs */
void write_phy_reg(struct net_device *dev, int mii_id, int regnum, int value)
{
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar *regbase = priv->phyregs;

	/* Set the PHY address and the register address we want to write */
	gfar_write(&regbase->miimadd, (mii_id << 8) | regnum);

	/* Write out the value we want */
	gfar_write(&regbase->miimcon, value);

	/* Wait for the transaction to finish */
	while (gfar_read(&regbase->miimind) & MIIMIND_BUSY)
		cpu_relax();
}

/* Reads from register regnum in the PHY for device dev, */
/* returning the value.  Clears miimcom first.  All PHY */
/* configuration has to be done through the TSEC1 MIIM regs */
int read_phy_reg(struct net_device *dev, int mii_id, int regnum)
{
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar *regbase = priv->phyregs;
	u16 value;

	/* Set the PHY address and the register address we want to read */
	gfar_write(&regbase->miimadd, (mii_id << 8) | regnum);

	/* Clear miimcom, and then initiate a read */
	gfar_write(&regbase->miimcom, 0);
	gfar_write(&regbase->miimcom, MII_READ_COMMAND);

	/* Wait for the transaction to finish */
	while (gfar_read(&regbase->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
		cpu_relax();

	/* Grab the value of the register from miimstat */
	value = gfar_read(&regbase->miimstat);

	return value;
}

void mii_clear_phy_interrupt(struct gfar_mii_info *mii_info)
{
	if(mii_info->phyinfo->ack_interrupt)
		mii_info->phyinfo->ack_interrupt(mii_info);
}


void mii_configure_phy_interrupt(struct gfar_mii_info *mii_info, u32 interrupts)
{
	mii_info->interrupts = interrupts;
	if(mii_info->phyinfo->config_intr)
		mii_info->phyinfo->config_intr(mii_info);
}


/* Writes MII_ADVERTISE with the appropriate values, after
 * sanitizing advertise to make sure only supported features
 * are advertised 
 */
static void config_genmii_advert(struct gfar_mii_info *mii_info)
{
	u32 advertise;
	u16 adv;

	/* Only allow advertising what this PHY supports */
	mii_info->advertising &= mii_info->phyinfo->features;
	advertise = mii_info->advertising;

	/* Setup standard advertisement */
	adv = phy_read(mii_info, MII_ADVERTISE);
	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
	if (advertise & ADVERTISED_10baseT_Half)
		adv |= ADVERTISE_10HALF;
	if (advertise & ADVERTISED_10baseT_Full)
		adv |= ADVERTISE_10FULL;
	if (advertise & ADVERTISED_100baseT_Half)
		adv |= ADVERTISE_100HALF;
	if (advertise & ADVERTISED_100baseT_Full)
		adv |= ADVERTISE_100FULL;
	phy_write(mii_info, MII_ADVERTISE, adv);
}

static void genmii_setup_forced(struct gfar_mii_info *mii_info)
{
	u16 ctrl;
	u32 features = mii_info->phyinfo->features;
	
	ctrl = phy_read(mii_info, MII_BMCR);

	ctrl &= ~(BMCR_FULLDPLX|BMCR_SPEED100|BMCR_SPEED1000|BMCR_ANENABLE);
	ctrl |= BMCR_RESET;

	switch(mii_info->speed) {
		case SPEED_1000:
			if(features & (SUPPORTED_1000baseT_Half
						| SUPPORTED_1000baseT_Full)) {
				ctrl |= BMCR_SPEED1000;
				break;
			}
			mii_info->speed = SPEED_100;
		case SPEED_100:
			if (features & (SUPPORTED_100baseT_Half
						| SUPPORTED_100baseT_Full)) {
				ctrl |= BMCR_SPEED100;
				break;
			}
			mii_info->speed = SPEED_10;
		case SPEED_10:
			if (features & (SUPPORTED_10baseT_Half
						| SUPPORTED_10baseT_Full))
				break;
		default: /* Unsupported speed! */
			printk(KERN_ERR "%s: Bad speed!\n", 
					mii_info->dev->name);
			break;
	}

	phy_write(mii_info, MII_BMCR, ctrl);
}


/* Enable and Restart Autonegotiation */
static void genmii_restart_aneg(struct gfar_mii_info *mii_info)
{
	u16 ctl;

	ctl = phy_read(mii_info, MII_BMCR);
	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
	phy_write(mii_info, MII_BMCR, ctl);
}


static int gbit_config_aneg(struct gfar_mii_info *mii_info)
{
	u16 adv;
	u32 advertise;

	if(mii_info->autoneg) {
		/* Configure the ADVERTISE register */
		config_genmii_advert(mii_info);
		advertise = mii_info->advertising;

		adv = phy_read(mii_info, MII_1000BASETCONTROL);
		adv &= ~(MII_1000BASETCONTROL_FULLDUPLEXCAP |
				MII_1000BASETCONTROL_HALFDUPLEXCAP);
		if (advertise & SUPPORTED_1000baseT_Half)
			adv |= MII_1000BASETCONTROL_HALFDUPLEXCAP;
		if (advertise & SUPPORTED_1000baseT_Full)
			adv |= MII_1000BASETCONTROL_FULLDUPLEXCAP;
		phy_write(mii_info, MII_1000BASETCONTROL, adv);

		/* Start/Restart aneg */
		genmii_restart_aneg(mii_info);
	} else
		genmii_setup_forced(mii_info);

	return 0;
}

static int marvell_config_aneg(struct gfar_mii_info *mii_info)
{
	/* The Marvell PHY has an errata which requires
	 * that certain registers get written in order
	 * to restart autonegotiation */
	phy_write(mii_info, MII_BMCR, BMCR_RESET);

	phy_write(mii_info, 0x1d, 0x1f);
	phy_write(mii_info, 0x1e, 0x200c);
	phy_write(mii_info, 0x1d, 0x5);
	phy_write(mii_info, 0x1e, 0);
	phy_write(mii_info, 0x1e, 0x100);

	gbit_config_aneg(mii_info);

	return 0;
}
static int genmii_config_aneg(struct gfar_mii_info *mii_info)
{
	if (mii_info->autoneg) {
		config_genmii_advert(mii_info);
		genmii_restart_aneg(mii_info);
	} else
		genmii_setup_forced(mii_info);

	return 0;
}


static int genmii_update_link(struct gfar_mii_info *mii_info)
{
	u16 status;

	/* Do a fake read */
	phy_read(mii_info, MII_BMSR);

	/* Read link and autonegotiation status */
	status = phy_read(mii_info, MII_BMSR);
	if ((status & BMSR_LSTATUS) == 0)
		mii_info->link = 0;
	else
		mii_info->link = 1;

	/* If we are autonegotiating, and not done, 
	 * return an error */
	if (mii_info->autoneg && !(status & BMSR_ANEGCOMPLETE))
		return -EAGAIN;

	return 0;
}

static int genmii_read_status(struct gfar_mii_info *mii_info)
{
	u16 status;
	int err;

	/* Update the link, but return if there
	 * was an error */
	err = genmii_update_link(mii_info);
	if (err)
		return err;

	if (mii_info->autoneg) {
		status = phy_read(mii_info, MII_LPA);

		if (status & (LPA_10FULL | LPA_100FULL))
			mii_info->duplex = DUPLEX_FULL;
		else
			mii_info->duplex = DUPLEX_HALF;
		if (status & (LPA_100FULL | LPA_100HALF))
			mii_info->speed = SPEED_100;
		else
			mii_info->speed = SPEED_10;
		mii_info->pause = 0;
	}
	/* On non-aneg, we assume what we put in BMCR is the speed,
	 * though magic-aneg shouldn't prevent this case from occurring
	 */

	return 0;
}
static int marvell_read_status(struct gfar_mii_info *mii_info)
{
	u16 status;
	int err;

	/* Update the link, but return if there
	 * was an error */
	err = genmii_update_link(mii_info);
	if (err)
		return err;

	/* If the link is up, read the speed and duplex */
	/* If we aren't autonegotiating, assume speeds 
	 * are as set */
	if (mii_info->autoneg && mii_info->link) {
		int speed;
		status = phy_read(mii_info, MII_M1011_PHY_SPEC_STATUS);

#if 0
		/* If speed and duplex aren't resolved,
		 * return an error.  Isn't this handled
		 * by checking aneg?
		 */
		if ((status & MII_M1011_PHY_SPEC_STATUS_RESOLVED) == 0)
			return -EAGAIN;
#endif

		/* Get the duplexity */
		if (status & MII_M1011_PHY_SPEC_STATUS_FULLDUPLEX)
			mii_info->duplex = DUPLEX_FULL;
		else