u-boot/common/miiphyutil.c

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/*
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* This provides a bit-banged interface to the ethernet MII management
* channel.
*/
#include <common.h>
#include <miiphy.h>
#if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
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#include <asm/types.h>
#include <linux/list.h>
#include <malloc.h>
#include <net.h>
/* local debug macro */
#define MII_DEBUG
#undef MII_DEBUG
#undef debug
#ifdef MII_DEBUG
#define debug(fmt,args...) printf (fmt ,##args)
#else
#define debug(fmt,args...)
#endif /* MII_DEBUG */
struct mii_dev {
struct list_head link;
char *name;
int (* read)(char *devname, unsigned char addr,
unsigned char reg, unsigned short *value);
int (* write)(char *devname, unsigned char addr,
unsigned char reg, unsigned short value);
};
static struct list_head mii_devs;
static struct mii_dev *current_mii;
/*****************************************************************************
*
* Initialize global data. Need to be called before any other miiphy routine.
*/
void miiphy_init()
{
INIT_LIST_HEAD(&mii_devs);
current_mii = NULL;
}
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/*****************************************************************************
*
* Register read and write MII access routines for the device <name>.
*/
void miiphy_register(char *name,
int (* read)(char *devname, unsigned char addr,
unsigned char reg, unsigned short *value),
int (* write)(char *devname, unsigned char addr,
unsigned char reg, unsigned short value))
{
struct list_head *entry;
struct mii_dev *new_dev;
struct mii_dev *miidev;
unsigned int name_len;
/* check if we have unique name */
list_for_each(entry, &mii_devs) {
miidev = list_entry(entry, struct mii_dev, link);
if (strcmp(miidev->name, name) == 0) {
printf("miiphy_register: non unique device name '%s'\n",
name);
return;
}
}
/* allocate memory */
name_len = strlen(name);
new_dev = (struct mii_dev *)malloc(sizeof(struct mii_dev) + name_len + 1);
if(new_dev == NULL) {
printf("miiphy_register: cannot allocate memory for '%s'\n",
name);
return;
}
memset(new_dev, 0, sizeof(struct mii_dev) + name_len);
/* initalize mii_dev struct fields */
INIT_LIST_HEAD(&new_dev->link);
new_dev->read = read;
new_dev->write = write;
new_dev->name = (char *)(new_dev + 1);
strncpy(new_dev->name, name, name_len);
new_dev->name[name_len] = '\0';
debug("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
new_dev->name, new_dev->read, new_dev->write);
/* add it to the list */
list_add_tail(&new_dev->link, &mii_devs);
if (!current_mii)
current_mii = new_dev;
}
int miiphy_set_current_dev(char *devname)
{
struct list_head *entry;
struct mii_dev *dev;
list_for_each(entry, &mii_devs) {
dev = list_entry(entry, struct mii_dev, link);
if (strcmp(devname, dev->name) == 0) {
current_mii = dev;
return 0;
}
}
printf("No such device: %s\n", devname);
return 1;
}
char *miiphy_get_current_dev()
{
if (current_mii)
return current_mii->name;
return NULL;
}
/*****************************************************************************
*
* Read to variable <value> from the PHY attached to device <devname>,
* use PHY address <addr> and register <reg>.
*
* Returns:
* 0 on success
*/
int miiphy_read(char *devname, unsigned char addr, unsigned char reg,
unsigned short *value)
{
struct list_head *entry;
struct mii_dev *dev;
int found_dev = 0;
int read_ret = 0;
if (!devname) {
printf("NULL device name!\n");
return 1;
}
list_for_each(entry, &mii_devs) {
dev = list_entry(entry, struct mii_dev, link);
if (strcmp(devname, dev->name) == 0) {
found_dev = 1;
read_ret = dev->read(devname, addr, reg, value);
break;
}
}
if (found_dev == 0)
printf("No such device: %s\n", devname);
return ((found_dev) ? read_ret : 1);
}
/*****************************************************************************
*
* Write <value> to the PHY attached to device <devname>,
* use PHY address <addr> and register <reg>.
*
* Returns:
* 0 on success
*/
int miiphy_write(char *devname, unsigned char addr, unsigned char reg,
unsigned short value)
{
struct list_head *entry;
struct mii_dev *dev;
int found_dev = 0;
int write_ret = 0;
if (!devname) {
printf("NULL device name!\n");
return 1;
}
list_for_each(entry, &mii_devs) {
dev = list_entry(entry, struct mii_dev, link);
if (strcmp(devname, dev->name) == 0) {
found_dev = 1;
write_ret = dev->write(devname, addr, reg, value);
break;
}
}
if (found_dev == 0)
printf("No such device: %s\n", devname);
return ((found_dev) ? write_ret : 1);
}
/*****************************************************************************
*
* Print out list of registered MII capable devices.
*/
void miiphy_listdev(void)
{
struct list_head *entry;
struct mii_dev *dev;
puts("MII devices: ");
list_for_each(entry, &mii_devs) {
dev = list_entry(entry, struct mii_dev, link);
printf("'%s' ", dev->name);
}
puts("\n");
if (current_mii)
printf("Current device: '%s'\n", current_mii->name);
}
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/*****************************************************************************
*
* Read the OUI, manufacture's model number, and revision number.
*
* OUI: 22 bits (unsigned int)
* Model: 6 bits (unsigned char)
* Revision: 4 bits (unsigned char)
*
* Returns:
* 0 on success
*/
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int miiphy_info (char *devname,
unsigned char addr,
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unsigned int *oui,
unsigned char *model, unsigned char *rev)
{
unsigned int reg = 0;
unsigned short tmp;
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if (miiphy_read (devname, addr, PHY_PHYIDR2, &tmp) != 0) {
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#ifdef DEBUG
puts ("PHY ID register 2 read failed\n");
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#endif
return (-1);
}
reg = tmp;
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#ifdef DEBUG
printf ("PHY_PHYIDR2 @ 0x%x = 0x%04x\n", addr, reg);
#endif
if (reg == 0xFFFF) {
/* No physical device present at this address */
return (-1);
}
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if (miiphy_read (devname, addr, PHY_PHYIDR1, &tmp) != 0) {
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#ifdef DEBUG
puts ("PHY ID register 1 read failed\n");
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#endif
return (-1);
}
reg |= tmp << 16;
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#ifdef DEBUG
printf ("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
#endif
*oui = ( reg >> 10);
*model = (unsigned char) ((reg >> 4) & 0x0000003F);
*rev = (unsigned char) ( reg & 0x0000000F);
return (0);
}
/*****************************************************************************
*
* Reset the PHY.
* Returns:
* 0 on success
*/
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int miiphy_reset (char *devname, unsigned char addr)
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{
unsigned short reg;
int loop_cnt;
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if (miiphy_read (devname, addr, PHY_BMCR, &reg) != 0) {
#ifdef DEBUG
printf ("PHY status read failed\n");
#endif
return (-1);
}
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if (miiphy_write (devname, addr, PHY_BMCR, reg | 0x8000) != 0) {
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#ifdef DEBUG
puts ("PHY reset failed\n");
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#endif
return (-1);
}
#ifdef CONFIG_PHY_RESET_DELAY
udelay (CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
#endif
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/*
* Poll the control register for the reset bit to go to 0 (it is
* auto-clearing). This should happen within 0.5 seconds per the
* IEEE spec.
*/
loop_cnt = 0;
reg = 0x8000;
while (((reg & 0x8000) != 0) && (loop_cnt++ < 1000000)) {
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if (miiphy_read (devname, addr, PHY_BMCR, &reg) != 0) {
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# ifdef DEBUG
puts ("PHY status read failed\n");
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# endif
return (-1);
}
}
if ((reg & 0x8000) == 0) {
return (0);
} else {
puts ("PHY reset timed out\n");
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return (-1);
}
return (0);
}
/*****************************************************************************
*
* Determine the ethernet speed (10/100).
*/
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int miiphy_speed (char *devname, unsigned char addr)
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{
unsigned short reg;
#if defined(CONFIG_PHY_GIGE)
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if (miiphy_read (devname, addr, PHY_1000BTSR, &reg)) {
printf ("PHY 1000BT Status read failed\n");
} else {
if (reg != 0xFFFF) {
if ((reg & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) !=0) {
return (_1000BASET);
}
}
}
#endif /* CONFIG_PHY_GIGE */
/* Check Basic Management Control Register first. */
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if (miiphy_read (devname, addr, PHY_BMCR, &reg)) {
puts ("PHY speed read failed, assuming 10bT\n");
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return (_10BASET);
}
/* Check if auto-negotiation is on. */
if ((reg & PHY_BMCR_AUTON) != 0) {
/* Get auto-negotiation results. */
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if (miiphy_read (devname, addr, PHY_ANLPAR, &reg)) {
puts ("PHY AN speed read failed, assuming 10bT\n");
return (_10BASET);
}
if ((reg & PHY_ANLPAR_100) != 0) {
return (_100BASET);
} else {
return (_10BASET);
}
}
/* Get speed from basic control settings. */
else if (reg & PHY_BMCR_100MB) {
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return (_100BASET);
} else {
return (_10BASET);
}
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}
/*****************************************************************************
*
* Determine full/half duplex.
*/
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int miiphy_duplex (char *devname, unsigned char addr)
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{
unsigned short reg;
#if defined(CONFIG_PHY_GIGE)
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if (miiphy_read (devname, addr, PHY_1000BTSR, &reg)) {
printf ("PHY 1000BT Status read failed\n");
} else {
if ( (reg != 0xFFFF) &&
(reg & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) ) {
if ((reg & PHY_1000BTSR_1000FD) !=0) {
return (FULL);
} else {
return (HALF);
}
}
}
#endif /* CONFIG_PHY_GIGE */
/* Check Basic Management Control Register first. */
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if (miiphy_read (devname, addr, PHY_BMCR, &reg)) {
puts ("PHY duplex read failed, assuming half duplex\n");
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return (HALF);
}
/* Check if auto-negotiation is on. */
if ((reg & PHY_BMCR_AUTON) != 0) {
/* Get auto-negotiation results. */
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if (miiphy_read (devname, addr, PHY_ANLPAR, &reg)) {
puts ("PHY AN duplex read failed, assuming half duplex\n");
return (HALF);
}
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if ((reg & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) != 0) {
return (FULL);
} else {
return (HALF);
}
}
/* Get speed from basic control settings. */
else if (reg & PHY_BMCR_DPLX) {
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return (FULL);
} else {
return (HALF);
}
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}
#ifdef CFG_FAULT_ECHO_LINK_DOWN
/*****************************************************************************
*
* Determine link status
*/
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int miiphy_link (char *devname, unsigned char addr)
{
unsigned short reg;
/* dummy read; needed to latch some phys */
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(void)miiphy_read(devname, addr, PHY_BMSR, &reg);
if (miiphy_read (devname, addr, PHY_BMSR, &reg)) {
puts ("PHY_BMSR read failed, assuming no link\n");
return (0);
}
/* Determine if a link is active */
if ((reg & PHY_BMSR_LS) != 0) {
return (1);
} else {
return (0);
}
}
#endif
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#endif /* CONFIG_MII || (CONFIG_COMMANDS & CFG_CMD_MII) */