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linux-sg2042/drivers/net/ibm_emac/ibm_emac_phy.c

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/*
* drivers/net/ibm_emac/ibm_emac_phy.c
*
* Driver for PowerPC 4xx on-chip ethernet controller, PHY support.
* Borrowed from sungem_phy.c, though I only kept the generic MII
* driver for now.
*
* This file should be shared with other drivers or eventually
* merged as the "low level" part of miilib
*
* (c) 2003, Benjamin Herrenscmidt (benh@kernel.crashing.org)
* (c) 2004-2005, Eugene Surovegin <ebs@ebshome.net>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <asm/ocp.h>
#include "ibm_emac_core.h"
#include "ibm_emac_phy.h"
static inline int phy_read(struct mii_phy *phy, int reg)
{
return phy->mdio_read(phy->dev, phy->address, reg);
}
static inline void phy_write(struct mii_phy *phy, int reg, int val)
{
phy->mdio_write(phy->dev, phy->address, reg, val);
}
/*
* polls MII_BMCR until BMCR_RESET bit clears or operation times out.
*
* returns:
* >= 0 => success, value in BMCR returned to caller
* -EBUSY => failure, RESET bit never cleared
* otherwise => failure, lower level PHY read failed
*/
static int mii_spin_reset_complete(struct mii_phy *phy)
{
int val;
int limit = 10000;
while (limit--) {
val = phy_read(phy, MII_BMCR);
if (val >= 0 && !(val & BMCR_RESET))
return val; /* success */
udelay(10);
}
if (val & BMCR_RESET)
val = -EBUSY;
if (net_ratelimit())
printk(KERN_ERR "emac%d: PHY reset timeout (%d)\n",
((struct ocp_enet_private *)phy->dev->priv)->def->index,
val);
return val;
}
int mii_reset_phy(struct mii_phy *phy)
{
int val;
val = phy_read(phy, MII_BMCR);
val &= ~BMCR_ISOLATE;
val |= BMCR_RESET;
phy_write(phy, MII_BMCR, val);
udelay(300);
val = mii_spin_reset_complete(phy);
if (val >= 0 && (val & BMCR_ISOLATE))
phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
return val < 0;
}
static int genmii_setup_aneg(struct mii_phy *phy, u32 advertise)
{
int ctl, adv;
phy->autoneg = AUTONEG_ENABLE;
phy->speed = SPEED_10;
phy->duplex = DUPLEX_HALF;
phy->pause = phy->asym_pause = 0;
phy->advertising = advertise;
/* Setup standard advertise */
adv = phy_read(phy, MII_ADVERTISE);
if (adv < 0)
return adv;
adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
ADVERTISE_PAUSE_ASYM);
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;
if (advertise & ADVERTISED_Pause)
adv |= ADVERTISE_PAUSE_CAP;
if (advertise & ADVERTISED_Asym_Pause)
adv |= ADVERTISE_PAUSE_ASYM;
phy_write(phy, MII_ADVERTISE, adv);
if (phy->features &
(SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
adv = phy_read(phy, MII_CTRL1000);
if (adv < 0)
return adv;
adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
if (advertise & ADVERTISED_1000baseT_Full)
adv |= ADVERTISE_1000FULL;
if (advertise & ADVERTISED_1000baseT_Half)
adv |= ADVERTISE_1000HALF;
phy_write(phy, MII_CTRL1000, adv);
}
/* Start/Restart aneg */
/* on some PHYs (e.g. National DP83843) a write to MII_ADVERTISE
* causes BMCR_RESET to be set on the next read of MII_BMCR, which
* if not checked for causes the PHY to be reset below */
ctl = mii_spin_reset_complete(phy);
if (ctl < 0)
return ctl;
ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
phy_write(phy, MII_BMCR, ctl);
return 0;
}
static int genmii_setup_forced(struct mii_phy *phy, int speed, int fd)
{
int ctl;
phy->autoneg = AUTONEG_DISABLE;
phy->speed = speed;
phy->duplex = fd;
phy->pause = phy->asym_pause = 0;
/* First reset the PHY */
mii_reset_phy(phy);
ctl = phy_read(phy, MII_BMCR);
if (ctl < 0)
return ctl;
ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_ANENABLE | BMCR_SPEED1000);
/* Select speed & duplex */
switch (speed) {
case SPEED_10:
break;
case SPEED_100:
ctl |= BMCR_SPEED100;
break;
case SPEED_1000:
ctl |= BMCR_SPEED1000;
break;
default:
return -EINVAL;
}
if (fd == DUPLEX_FULL)
ctl |= BMCR_FULLDPLX;
phy_write(phy, MII_BMCR, ctl);
return 0;
}
static int genmii_poll_link(struct mii_phy *phy)
{
int status;
/* Clear latched value with dummy read */
phy_read(phy, MII_BMSR);
status = phy_read(phy, MII_BMSR);
if (status < 0 || (status & BMSR_LSTATUS) == 0)
return 0;
if (phy->autoneg == AUTONEG_ENABLE && !(status & BMSR_ANEGCOMPLETE))
return 0;
return 1;
}
static int genmii_read_link(struct mii_phy *phy)
{
if (phy->autoneg == AUTONEG_ENABLE) {
int glpa = 0;
int lpa = phy_read(phy, MII_LPA) & phy_read(phy, MII_ADVERTISE);
if (lpa < 0)
return lpa;
if (phy->features &
(SUPPORTED_1000baseT_Full | SUPPORTED_1000baseT_Half)) {
int adv = phy_read(phy, MII_CTRL1000);
glpa = phy_read(phy, MII_STAT1000);
if (glpa < 0 || adv < 0)
return adv;
glpa &= adv << 2;
}
phy->speed = SPEED_10;
phy->duplex = DUPLEX_HALF;
phy->pause = phy->asym_pause = 0;
if (glpa & (LPA_1000FULL | LPA_1000HALF)) {
phy->speed = SPEED_1000;
if (glpa & LPA_1000FULL)
phy->duplex = DUPLEX_FULL;
} else if (lpa & (LPA_100FULL | LPA_100HALF)) {
phy->speed = SPEED_100;
if (lpa & LPA_100FULL)
phy->duplex = DUPLEX_FULL;
} else if (lpa & LPA_10FULL)
phy->duplex = DUPLEX_FULL;
if (phy->duplex == DUPLEX_FULL) {
phy->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
phy->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
}
} else {
int bmcr = phy_read(phy, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_FULLDPLX)
phy->duplex = DUPLEX_FULL;
else
phy->duplex = DUPLEX_HALF;
if (bmcr & BMCR_SPEED1000)
phy->speed = SPEED_1000;
else if (bmcr & BMCR_SPEED100)
phy->speed = SPEED_100;
else
phy->speed = SPEED_10;
phy->pause = phy->asym_pause = 0;
}
return 0;
}
/* Generic implementation for most 10/100/1000 PHYs */
static struct mii_phy_ops generic_phy_ops = {
.setup_aneg = genmii_setup_aneg,
.setup_forced = genmii_setup_forced,
.poll_link = genmii_poll_link,
.read_link = genmii_read_link
};
static struct mii_phy_def genmii_phy_def = {
.phy_id = 0x00000000,
.phy_id_mask = 0x00000000,
.name = "Generic MII",
.ops = &generic_phy_ops
};
/* CIS8201 */
#define MII_CIS8201_10BTCSR 0x16
#define TENBTCSR_ECHO_DISABLE 0x2000
#define MII_CIS8201_EPCR 0x17
#define EPCR_MODE_MASK 0x3000
#define EPCR_GMII_MODE 0x0000
#define EPCR_RGMII_MODE 0x1000
#define EPCR_TBI_MODE 0x2000
#define EPCR_RTBI_MODE 0x3000
#define MII_CIS8201_ACSR 0x1c
#define ACSR_PIN_PRIO_SELECT 0x0004
static int cis8201_init(struct mii_phy *phy)
{
int epcr;
epcr = phy_read(phy, MII_CIS8201_EPCR);
if (epcr < 0)
return epcr;
epcr &= ~EPCR_MODE_MASK;
switch (phy->mode) {
case PHY_MODE_TBI:
epcr |= EPCR_TBI_MODE;
break;
case PHY_MODE_RTBI:
epcr |= EPCR_RTBI_MODE;
break;
case PHY_MODE_GMII:
epcr |= EPCR_GMII_MODE;
break;
case PHY_MODE_RGMII:
default:
epcr |= EPCR_RGMII_MODE;
}
phy_write(phy, MII_CIS8201_EPCR, epcr);
/* MII regs override strap pins */
phy_write(phy, MII_CIS8201_ACSR,
phy_read(phy, MII_CIS8201_ACSR) | ACSR_PIN_PRIO_SELECT);
/* Disable TX_EN -> CRS echo mode, otherwise 10/HDX doesn't work */
phy_write(phy, MII_CIS8201_10BTCSR,
phy_read(phy, MII_CIS8201_10BTCSR) | TENBTCSR_ECHO_DISABLE);
return 0;
}
static struct mii_phy_ops cis8201_phy_ops = {
.init = cis8201_init,
.setup_aneg = genmii_setup_aneg,
.setup_forced = genmii_setup_forced,
.poll_link = genmii_poll_link,
.read_link = genmii_read_link
};
static struct mii_phy_def cis8201_phy_def = {
.phy_id = 0x000fc410,
.phy_id_mask = 0x000ffff0,
.name = "CIS8201 Gigabit Ethernet",
.ops = &cis8201_phy_ops
};
static struct mii_phy_def *mii_phy_table[] = {
&cis8201_phy_def,
&genmii_phy_def,
NULL
};
int mii_phy_probe(struct mii_phy *phy, int address)
{
struct mii_phy_def *def;
int i;
int id;
phy->autoneg = AUTONEG_DISABLE;
phy->advertising = 0;
phy->address = address;
phy->speed = SPEED_10;
phy->duplex = DUPLEX_HALF;
phy->pause = phy->asym_pause = 0;
/* Take PHY out of isolate mode and reset it. */
if (mii_reset_phy(phy))
return -ENODEV;
/* Read ID and find matching entry */
id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
if (id < 0)
return -ENODEV;
for (i = 0; (def = mii_phy_table[i]) != NULL; i++)
if ((id & def->phy_id_mask) == def->phy_id)
break;
/* Should never be NULL (we have a generic entry), but... */
if (!def)
return -ENODEV;
phy->def = def;
/* Determine PHY features if needed */
phy->features = def->features;
if (!phy->features) {
u16 bmsr = phy_read(phy, MII_BMSR);
if (bmsr & BMSR_ANEGCAPABLE)
phy->features |= SUPPORTED_Autoneg;
if (bmsr & BMSR_10HALF)
phy->features |= SUPPORTED_10baseT_Half;
if (bmsr & BMSR_10FULL)
phy->features |= SUPPORTED_10baseT_Full;
if (bmsr & BMSR_100HALF)
phy->features |= SUPPORTED_100baseT_Half;
if (bmsr & BMSR_100FULL)
phy->features |= SUPPORTED_100baseT_Full;
if (bmsr & BMSR_ESTATEN) {
u16 esr = phy_read(phy, MII_ESTATUS);
if (esr & ESTATUS_1000_TFULL)
phy->features |= SUPPORTED_1000baseT_Full;
if (esr & ESTATUS_1000_THALF)
phy->features |= SUPPORTED_1000baseT_Half;
}
phy->features |= SUPPORTED_MII;
}
/* Setup default advertising */
phy->advertising = phy->features;
return 0;
}
MODULE_LICENSE("GPL");
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