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>
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#include <asm/types.h>
#include <linux/list.h>
#include <malloc.h>
#include <net.h>
/* local debug macro */
#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;
const char *name;
int (*read) (const char *devname, unsigned char addr,
unsigned char reg, unsigned short *value);
int (*write) (const char *devname, unsigned char addr,
unsigned char reg, unsigned short value);
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};
static struct list_head mii_devs;
static struct mii_dev *current_mii;
/*
* Lookup the mii_dev struct by the registered device name.
*/
static struct mii_dev *miiphy_get_dev_by_name(const char *devname, int quiet)
{
struct list_head *entry;
struct mii_dev *dev;
if (!devname) {
printf("NULL device name!\n");
return NULL;
}
list_for_each(entry, &mii_devs) {
dev = list_entry(entry, struct mii_dev, link);
if (strcmp(dev->name, devname) == 0)
return dev;
}
if (!quiet)
printf("No such device: %s\n", devname);
return NULL;
}
/*****************************************************************************
*
* Initialize global data. Need to be called before any other miiphy routine.
*/
void miiphy_init(void)
{
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(const char *name,
int (*read) (const char *devname, unsigned char addr,
unsigned char reg, unsigned short *value),
int (*write) (const char *devname, unsigned char addr,
unsigned char reg, unsigned short value))
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{
struct mii_dev *new_dev;
unsigned int name_len;
char *new_name;
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/* check if we have unique name */
new_dev = miiphy_get_dev_by_name(name, 1);
if (new_dev) {
printf("miiphy_register: non unique device name '%s'\n", name);
return;
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}
/* allocate memory */
name_len = strlen (name);
new_dev =
(struct mii_dev *)malloc (sizeof (struct mii_dev) + name_len + 1);
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if (new_dev == NULL) {
printf ("miiphy_register: cannot allocate memory for '%s'\n",
name);
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return;
}
memset (new_dev, 0, sizeof (struct mii_dev) + name_len);
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/* initalize mii_dev struct fields */
INIT_LIST_HEAD (&new_dev->link);
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new_dev->read = read;
new_dev->write = write;
new_dev->name = new_name = (char *)(new_dev + 1);
strncpy (new_name, name, name_len);
new_name[name_len] = '\0';
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debug ("miiphy_register: added '%s', read=0x%08lx, write=0x%08lx\n",
new_dev->name, new_dev->read, new_dev->write);
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/* add it to the list */
list_add_tail (&new_dev->link, &mii_devs);
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if (!current_mii)
current_mii = new_dev;
}
int miiphy_set_current_dev(const char *devname)
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{
struct mii_dev *dev;
dev = miiphy_get_dev_by_name(devname, 0);
if (dev) {
current_mii = dev;
return 0;
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}
return 1;
}
const char *miiphy_get_current_dev(void)
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{
if (current_mii)
return current_mii->name;
return NULL;
}
static struct mii_dev *miiphy_get_active_dev(const char *devname)
{
/* If the current mii is the one we want, return it */
if (current_mii)
if (strcmp(current_mii->name, devname) == 0)
return current_mii;
/* Otherwise, set the active one to the one we want */
if (miiphy_set_current_dev(devname))
return NULL;
else
return current_mii;
}
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/*****************************************************************************
*
* 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(const char *devname, unsigned char addr, unsigned char reg,
unsigned short *value)
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{
struct mii_dev *dev;
dev = miiphy_get_active_dev(devname);
if (dev)
return dev->read(devname, addr, reg, value);
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return 1;
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}
/*****************************************************************************
*
* Write <value> to the PHY attached to device <devname>,
* use PHY address <addr> and register <reg>.
*
* Returns:
* 0 on success
*/
int miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
unsigned short value)
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{
struct mii_dev *dev;
dev = miiphy_get_active_dev(devname);
if (dev)
return dev->write(devname, addr, reg, value);
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return 1;
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}
/*****************************************************************************
*
* Print out list of registered MII capable devices.
*/
void miiphy_listdev (void)
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{
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);
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}
puts ("\n");
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if (current_mii)
printf ("Current device: '%s'\n", current_mii->name);
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}
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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
*/
int miiphy_info(const char *devname, unsigned char addr, unsigned int *oui,
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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) {
debug ("PHY ID register 2 read failed\n");
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return (-1);
}
reg = tmp;
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debug ("PHY_PHYIDR2 @ 0x%x = 0x%04x\n", addr, reg);
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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) {
debug ("PHY ID register 1 read failed\n");
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return (-1);
}
reg |= tmp << 16;
debug ("PHY_PHYIDR[1,2] @ 0x%x = 0x%08x\n", addr, reg);
*oui = (reg >> 10);
*model = (unsigned char)((reg >> 4) & 0x0000003F);
*rev = (unsigned char)(reg & 0x0000000F);
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return (0);
}
/*****************************************************************************
*
* Reset the PHY.
* Returns:
* 0 on success
*/
int miiphy_reset(const char *devname, unsigned char addr)
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{
unsigned short reg;
int timeout = 500;
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if (miiphy_read (devname, addr, PHY_BMCR, &reg) != 0) {
debug ("PHY status read failed\n");
return (-1);
}
if (miiphy_write (devname, addr, PHY_BMCR, reg | PHY_BMCR_RESET) != 0) {
debug ("PHY reset failed\n");
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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.
*/
reg = 0x8000;
while (((reg & 0x8000) != 0) && timeout--) {
if (miiphy_read(devname, addr, PHY_BMCR, &reg) != 0) {
debug("PHY status read failed\n");
return -1;
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}
udelay(1000);
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}
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 (10/100/1000). Return 10 on error.
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*/
int miiphy_speed(const char *devname, unsigned char addr)
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{
u16 bmcr, anlpar;
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#if defined(CONFIG_PHY_GIGE)
u16 btsr;
/*
* Check for 1000BASE-X. If it is supported, then assume that the speed
* is 1000.
*/
if (miiphy_is_1000base_x (devname, addr)) {
return _1000BASET;
}
/*
* No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
*/
/* Check for 1000BASE-T. */
if (miiphy_read (devname, addr, PHY_1000BTSR, &btsr)) {
printf ("PHY 1000BT status");
goto miiphy_read_failed;
}
if (btsr != 0xFFFF &&
(btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD))) {
return _1000BASET;
}
#endif /* CONFIG_PHY_GIGE */
/* Check Basic Management Control Register first. */
if (miiphy_read (devname, addr, PHY_BMCR, &bmcr)) {
printf ("PHY speed");
goto miiphy_read_failed;
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}
/* Check if auto-negotiation is on. */
if (bmcr & PHY_BMCR_AUTON) {
/* Get auto-negotiation results. */
if (miiphy_read (devname, addr, PHY_ANLPAR, &anlpar)) {
printf ("PHY AN speed");
goto miiphy_read_failed;
}
return (anlpar & PHY_ANLPAR_100) ? _100BASET : _10BASET;
}
/* Get speed from basic control settings. */
return (bmcr & PHY_BMCR_100MB) ? _100BASET : _10BASET;
miiphy_read_failed:
printf (" read failed, assuming 10BASE-T\n");
return _10BASET;
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}
/*****************************************************************************
*
* Determine full/half duplex. Return half on error.
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*/
int miiphy_duplex(const char *devname, unsigned char addr)
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{
u16 bmcr, anlpar;
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#if defined(CONFIG_PHY_GIGE)
u16 btsr;
/* Check for 1000BASE-X. */
if (miiphy_is_1000base_x (devname, addr)) {
/* 1000BASE-X */
if (miiphy_read (devname, addr, PHY_ANLPAR, &anlpar)) {
printf ("1000BASE-X PHY AN duplex");
goto miiphy_read_failed;
}
}
/*
* No 1000BASE-X, so assume 1000BASE-T/100BASE-TX/10BASE-T register set.
*/
/* Check for 1000BASE-T. */
if (miiphy_read (devname, addr, PHY_1000BTSR, &btsr)) {
printf ("PHY 1000BT status");
goto miiphy_read_failed;
}
if (btsr != 0xFFFF) {
if (btsr & PHY_1000BTSR_1000FD) {
return FULL;
} else if (btsr & PHY_1000BTSR_1000HD) {
return HALF;
}
}
#endif /* CONFIG_PHY_GIGE */
/* Check Basic Management Control Register first. */
if (miiphy_read (devname, addr, PHY_BMCR, &bmcr)) {
puts ("PHY duplex");
goto miiphy_read_failed;
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}
/* Check if auto-negotiation is on. */
if (bmcr & PHY_BMCR_AUTON) {
/* Get auto-negotiation results. */
if (miiphy_read (devname, addr, PHY_ANLPAR, &anlpar)) {
puts ("PHY AN duplex");
goto miiphy_read_failed;
}
return (anlpar & (PHY_ANLPAR_10FD | PHY_ANLPAR_TXFD)) ?
FULL : HALF;
}
/* Get speed from basic control settings. */
return (bmcr & PHY_BMCR_DPLX) ? FULL : HALF;
miiphy_read_failed:
printf (" read failed, assuming half duplex\n");
return HALF;
}
/*****************************************************************************
*
* Return 1 if PHY supports 1000BASE-X, 0 if PHY supports 10BASE-T/100BASE-TX/
* 1000BASE-T, or on error.
*/
int miiphy_is_1000base_x(const char *devname, unsigned char addr)
{
#if defined(CONFIG_PHY_GIGE)
u16 exsr;
if (miiphy_read (devname, addr, PHY_EXSR, &exsr)) {
printf ("PHY extended status read failed, assuming no "
"1000BASE-X\n");
return 0;
}
return 0 != (exsr & (PHY_EXSR_1000XF | PHY_EXSR_1000XH));
#else
return 0;
#endif
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}
#ifdef CONFIG_SYS_FAULT_ECHO_LINK_DOWN
/*****************************************************************************
*
* Determine link status
*/
int miiphy_link(const char *devname, unsigned char addr)
{
unsigned short reg;
/* dummy read; needed to latch some phys */
(void)miiphy_read (devname, addr, PHY_BMSR, &reg);
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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