// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/net/ethernet/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
*
* Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
* <[email protected]>
*
* Based on the arch/ppc version of the driver:
*
* (c) 2003, Benjamin Herrenscmidt ([email protected])
* (c) 2004-2005, Eugene Surovegin <[email protected]>
*
*/
#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 "emac.h"
#include "phy.h"
#define phy_read _phy_read
#define phy_write _phy_write
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);
}
static inline int gpcs_phy_read(struct mii_phy *phy, int reg)
{
return phy->mdio_read(phy->dev, phy->gpcs_address, reg);
}
static inline void gpcs_phy_write(struct mii_phy *phy, int reg, int val)
{
phy->mdio_write(phy->dev, phy->gpcs_address, reg, val);
}
int emac_mii_reset_phy(struct mii_phy *phy)
{
int val;
int limit = 10000;
val = phy_read(phy, MII_BMCR);
val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
val |= BMCR_RESET;
phy_write(phy, MII_BMCR, val);
udelay(300);
while (--limit) {
val = phy_read(phy, MII_BMCR);
if (val >= 0 && (val & BMCR_RESET) == 0)
break;
udelay(10);
}
if ((val & BMCR_ISOLATE) && limit > 0)
phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
return limit <= 0;
}
int emac_mii_reset_gpcs(struct mii_phy *phy)
{
int val;
int limit = 10000;
val = gpcs_phy_read(phy, MII_BMCR);
val &= ~(BMCR_ISOLATE | BMCR_ANENABLE);
val |= BMCR_RESET;
gpcs_phy_write(phy, MII_BMCR, val);
udelay(300);
while (--limit) {
val = gpcs_phy_read(phy, MII_BMCR);
if (val >= 0 && (val & BMCR_RESET) == 0)
break;
udelay(10);
}
if ((val & BMCR_ISOLATE) && limit > 0)
gpcs_phy_write(phy, MII_BMCR, val & ~BMCR_ISOLATE);
if (limit > 0 && phy->mode == PHY_INTERFACE_MODE_SGMII) {
/* Configure GPCS interface to recommended setting for SGMII */
gpcs_phy_write(phy, 0x04, 0x8120); /* AsymPause, FDX */
gpcs_phy_write(phy, 0x07, 0x2801); /* msg_pg, toggle */
gpcs_phy_write(phy, 0x00, 0x0140); /* 1Gbps, FDX */
}
return limit <= 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;
ctl = phy_read(phy, MII_BMCR);
if (ctl < 0)
return ctl;
ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
/* First clear the PHY */
phy_write(phy, MII_BMCR, ctl);
/* 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 */
ctl = phy_read(phy, MII_BMCR);
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;
ctl = phy_read(phy, MII_BMCR);
if (ctl < 0)
return ctl;
ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 | BMCR_SPEED1000 | BMCR_ANENABLE);
/* First clear the PHY */
phy_write(phy, MII_BMCR, ctl | BMCR_RESET);
/* 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 const 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_INTERFACE_MODE_TBI:
epcr |= EPCR_TBI_MODE;
break;
case PHY_INTERFACE_MODE_RTBI:
epcr |= EPCR_RTBI_MODE;
break;
case PHY_INTERFACE_MODE_GMII:
epcr |= EPCR_GMII_MODE;
break;
case PHY_INTERFACE_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 const 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 bcm5248_phy_def = {
.phy_id = 0x0143bc00,
.phy_id_mask = 0x0ffffff0,
.name = "BCM5248 10/100 SMII Ethernet",
.ops = &generic_phy_ops
};
static int m88e1111_init(struct mii_phy *phy)
{
pr_debug("%s: Marvell 88E1111 Ethernet\n", __func__);
phy_write(phy, 0x14, 0x0ce3);
phy_write(phy, 0x18, 0x4101);
phy_write(phy, 0x09, 0x0e00);
phy_write(phy, 0x04, 0x01e1);
phy_write(phy, 0x00, 0x9140);
phy_write(phy, 0x00, 0x1140);
return 0;
}
static int m88e1112_init(struct mii_phy *phy)
{
/*
* Marvell 88E1112 PHY needs to have the SGMII MAC
* interace (page 2) properly configured to
* communicate with the 460EX/GT GPCS interface.
*/
u16 reg_short;
pr_debug("%s: Marvell 88E1112 Ethernet\n", __func__);
/* Set access to Page 2 */
phy_write(phy, 0x16, 0x0002);
phy_write(phy, 0x00, 0x0040); /* 1Gbps */
reg_short = (u16)(phy_read(phy, 0x1a));
reg_short |= 0x8000; /* bypass Auto-Negotiation */
phy_write(phy, 0x1a, reg_short);
emac_mii_reset_phy(phy); /* reset MAC interface */
/* Reset access to Page 0 */
phy_write(phy, 0x16, 0x0000);
return 0;
}
static int et1011c_init(struct mii_phy *phy)
{
u16 reg_short;
reg_short = (u16)(phy_read(phy, 0x16));
reg_short &= ~(0x7);
reg_short |= 0x6; /* RGMII Trace Delay*/
phy_write(phy, 0x16, reg_short);
reg_short = (u16)(phy_read(phy, 0x17));
reg_short &= ~(0x40);
phy_write(phy, 0x17, reg_short);
phy_write(phy, 0x1c, 0x74f0);
return 0;
}
static const struct mii_phy_ops et1011c_phy_ops = {
.init = et1011c_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 et1011c_phy_def = {
.phy_id = 0x0282f000,
.phy_id_mask = 0x0fffff00,
.name = "ET1011C Gigabit Ethernet",
.ops = &et1011c_phy_ops
};
static const struct mii_phy_ops m88e1111_phy_ops = {
.init = m88e1111_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 m88e1111_phy_def = {
.phy_id = 0x01410CC0,
.phy_id_mask = 0x0ffffff0,
.name = "Marvell 88E1111 Ethernet",
.ops = &m88e1111_phy_ops,
};
static const struct mii_phy_ops m88e1112_phy_ops = {
.init = m88e1112_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 m88e1112_phy_def = {
.phy_id = 0x01410C90,
.phy_id_mask = 0x0ffffff0,
.name = "Marvell 88E1112 Ethernet",
.ops = &m88e1112_phy_ops,
};
static int ar8035_init(struct mii_phy *phy)
{
phy_write(phy, 0x1d, 0x5); /* Address debug register 5 */
phy_write(phy, 0x1e, 0x2d47); /* Value copied from u-boot */
phy_write(phy, 0x1d, 0xb); /* Address hib ctrl */
phy_write(phy, 0x1e, 0xbc20); /* Value copied from u-boot */
return 0;
}
static const struct mii_phy_ops ar8035_phy_ops = {
.init = ar8035_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 ar8035_phy_def = {
.phy_id = 0x004dd070,
.phy_id_mask = 0xfffffff0,
.name = "Atheros 8035 Gigabit Ethernet",
.ops = &ar8035_phy_ops,
};
static struct mii_phy_def *mii_phy_table[] = {
&et1011c_phy_def,
&cis8201_phy_def,
&bcm5248_phy_def,
&m88e1111_phy_def,
&m88e1112_phy_def,
&ar8035_phy_def,
&genmii_phy_def,
NULL
};
int emac_mii_phy_probe(struct mii_phy *phy, int address)
{
struct mii_phy_def *def;
int i;
u32 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 (emac_mii_reset_phy(phy))
return -ENODEV;
/* Read ID and find matching entry */
id = (phy_read(phy, MII_PHYSID1) << 16) | phy_read(phy, MII_PHYSID2);
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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