sysmo-bts
/
barebox
9
0
Fork 0
Code Releases Activity
barebox/drivers/net/phy/phy.c

569 lines
12 KiB
C
Raw Blame History

/*
* drivers/net/phy/phy.c
*
* Framework for finding and configuring PHYs.
* Also contains generic PHY driver
*
* Copyright (c) 2009-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* Author: Andy Fleming
*
* Copyright (c) 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 <common.h>
#include <driver.h>
#include <net.h>
#include <malloc.h>
#include <linux/phy.h>
#include <linux/phy.h>
#include <linux/err.h>
#define PHY_AN_TIMEOUT 10
static int genphy_config_init(struct phy_device *phydev);
struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id)
{
struct phy_device *dev;
/* We allocate the device, and initialize the
* default values */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (NULL == dev)
return (struct phy_device*) PTR_ERR((void*)-ENOMEM);
dev->speed = 0;
dev->duplex = -1;
dev->pause = dev->asym_pause = 0;
dev->link = 1;
dev->autoneg = AUTONEG_ENABLE;
dev->addr = addr;
dev->phy_id = phy_id;
dev->bus = bus;
dev->dev.parent = bus->parent;
dev->dev.bus = &mdio_bus_type;
strcpy(dev->dev.name, "phy");
dev->dev.id = DEVICE_ID_DYNAMIC;
return dev;
}
/**
* get_phy_id - reads the specified addr for its ID.
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @phy_id: where to store the ID retrieved.
*
* Description: Reads the ID registers of the PHY at @addr on the
* @bus, stores it in @phy_id and returns zero on success.
*/
int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id)
{
int phy_reg;
/* Grab the bits from PHYIR1, and put them
* in the upper half */
phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
if (phy_reg < 0)
return -EIO;
*phy_id = (phy_reg & 0xffff) << 16;
/* Grab the bits from PHYIR2, and put them in the lower half */
phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
if (phy_reg < 0)
return -EIO;
*phy_id |= (phy_reg & 0xffff);
return 0;
}
/**
* get_phy_device - reads the specified PHY device and returns its @phy_device struct
* @bus: the target MII bus
* @addr: PHY address on the MII bus
*
* Description: Reads the ID registers of the PHY at @addr on the
* @bus, then allocates and returns the phy_device to represent it.
*/
struct phy_device *get_phy_device(struct mii_bus *bus, int addr)
{
struct phy_device *dev = NULL;
u32 phy_id = 0;
int r;
r = get_phy_id(bus, addr, &phy_id);
if (r)
return ERR_PTR(r);
/* If the phy_id is mostly Fs, there is no device there */
if ((phy_id & 0x1fffffff) == 0x1fffffff)
return NULL;
dev = phy_device_create(bus, addr, phy_id);
return dev;
}
/* Automatically gets and returns the PHY device */
int phy_device_connect(struct eth_device *edev, struct mii_bus *bus, int addr,
void (*adjust_link) (struct eth_device *edev),
u32 flags, phy_interface_t interface)
{
struct phy_driver* drv;
struct phy_device* dev = NULL;
unsigned int i;
int ret = -EINVAL;
if (!edev->phydev) {
if (addr >= 0) {
dev = bus->phy_map[addr];
if (!dev) {
ret = -EIO;
goto fail;
}
dev->attached_dev = edev;
dev->interface = interface;
dev->dev_flags = flags;
ret = register_device(&dev->dev);
if (ret)
goto fail;
} else {
for (i = 0; i < PHY_MAX_ADDR && !edev->phydev; i++) {
dev = bus->phy_map[i];
if (!dev || dev->attached_dev)
continue;
dev->attached_dev = edev;
dev->interface = interface;
dev->dev_flags = flags;
ret = register_device(&dev->dev);
if (ret)
goto fail;
break;
}
}
if (!edev->phydev) {
ret = -EIO;
goto fail;
}
}
dev = edev->phydev;
drv = to_phy_driver(dev->dev.driver);
drv->config_aneg(dev);
ret = drv->read_status(dev);
if (ret < 0)
return ret;
if (dev->link)
printf("%dMbps %s duplex link detected\n", dev->speed,
dev->duplex ? "full" : "half");
if (adjust_link)
adjust_link(edev);
return 0;
fail:
if (dev)
dev->attached_dev = NULL;
puts("Unable to find a PHY (unknown ID?)\n");
return ret;
}
/* Generic PHY support and helper functions */
/**
* genphy_config_advert - sanitize and advertise auto-negotiation parameters
* @phydev: target phy_device struct
*
* Description: Writes MII_ADVERTISE with the appropriate values,
* after sanitizing the values to make sure we only advertise
* what is supported. Returns < 0 on error, 0 if the PHY's advertisement
* hasn't changed, and > 0 if it has changed.
*/
int genphy_config_advert(struct phy_device *phydev)
{
u32 advertise;
int oldadv, adv;
int err, changed = 0;
/* Only allow advertising what
* this PHY supports */
phydev->advertising &= phydev->supported;
advertise = phydev->advertising;
/* Setup standard advertisement */
oldadv = adv = phy_read(phydev, MII_ADVERTISE);
if (adv < 0)
return adv;
adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
ADVERTISE_PAUSE_ASYM);
adv |= ethtool_adv_to_mii_adv_t(advertise);
if (adv != oldadv) {
err = phy_write(phydev, MII_ADVERTISE, adv);
if (err < 0)
return err;
changed = 1;
}
/* Configure gigabit if it's supported */
if (phydev->supported & (SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full)) {
oldadv = adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
if (adv != oldadv) {
err = phy_write(phydev, MII_CTRL1000, adv);
if (err < 0)
return err;
changed = 1;
}
}
return changed;
}
/**
* genphy_setup_forced - configures/forces speed/duplex from @phydev
* @phydev: target phy_device struct
*
* Description: Configures MII_BMCR to force speed/duplex
* to the values in phydev. Assumes that the values are valid.
* Please see phy_sanitize_settings().
*/
int genphy_setup_forced(struct phy_device *phydev)
{
int err;
int ctl = 0;
phydev->pause = phydev->asym_pause = 0;
if (SPEED_1000 == phydev->speed)
ctl |= BMCR_SPEED1000;
else if (SPEED_100 == phydev->speed)
ctl |= BMCR_SPEED100;
if (DUPLEX_FULL == phydev->duplex)
ctl |= BMCR_FULLDPLX;
err = phy_write(phydev, MII_BMCR, ctl);
return err;
}
static int phy_aneg_done(struct phy_device *phydev)
{
uint64_t start = get_time_ns();
int ctl;
while (!is_timeout(start, PHY_AN_TIMEOUT * SECOND)) {
ctl = phy_read(phydev, MII_BMSR);
if (ctl & BMSR_ANEGCOMPLETE) {
phydev->link = 1;
return 0;
}
/* Restart auto-negotiation if remote fault */
if (ctl & BMSR_RFAULT) {
puts("PHY remote fault detected\n"
"PHY restarting auto-negotiation\n");
phy_write(phydev, MII_BMCR,
BMCR_ANENABLE | BMCR_ANRESTART);
}
}
phydev->link = 0;
return -ETIMEDOUT;
}
/**
* genphy_restart_aneg - Enable and Restart Autonegotiation
* @phydev: target phy_device struct
*/
int genphy_restart_aneg(struct phy_device *phydev)
{
int ctl;
ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
/* Don't isolate the PHY if we're negotiating */
ctl &= ~(BMCR_ISOLATE);
ctl = phy_write(phydev, MII_BMCR, ctl);
if (ctl < 0)
return ctl;
return phy_aneg_done(phydev);
}
/**
* genphy_config_aneg - restart auto-negotiation or write BMCR
* @phydev: target phy_device struct
*
* Description: If auto-negotiation is enabled, we configure the
* advertising, and then restart auto-negotiation. If it is not
* enabled, then we write the BMCR.
*/
int genphy_config_aneg(struct phy_device *phydev)
{
int result;
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
result = genphy_config_advert(phydev);
if (result < 0) /* error */
return result;
if (result == 0) {
/* Advertisement hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated? */
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
result = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before. */
if (result > 0)
result = genphy_restart_aneg(phydev);
return result;
}
/**
* genphy_update_link - update link status in @phydev
* @phydev: target phy_device struct
*
* Description: Update the value in phydev->link to reflect the
* current link value. In order to do this, we need to read
* the status register twice, keeping the second value.
*/
int genphy_update_link(struct phy_device *phydev)
{
int status;
/* Do a fake read */
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
/* wait phy status update in the phy */
udelay(1000);
/* Read link and autonegotiation status */
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
if ((status & BMSR_LSTATUS) == 0)
phydev->link = 0;
else
phydev->link = 1;
return 0;
}
/**
* genphy_read_status - check the link status and update current link state
* @phydev: target phy_device struct
*
* Description: Check the link, then figure out the current state
* by comparing what we advertise with what the link partner
* advertises. Start by checking the gigabit possibilities,
* then move on to 10/100.
*/
int genphy_read_status(struct phy_device *phydev)
{
int adv;
int err;
int lpa;
int lpagb = 0;
/* Update the link, but return if there
* was an error */
err = genphy_update_link(phydev);
if (err)
return err;
if (AUTONEG_ENABLE == phydev->autoneg) {
if (phydev->supported & (SUPPORTED_1000baseT_Half
| SUPPORTED_1000baseT_Full)) {
lpagb = phy_read(phydev, MII_STAT1000);
if (lpagb < 0)
return lpagb;
adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
lpagb &= adv << 2;
}
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
adv = phy_read(phydev, MII_ADVERTISE);
if (adv < 0)
return adv;
lpa &= adv;
phydev->speed = SPEED_10;
phydev->duplex = DUPLEX_HALF;
phydev->pause = phydev->asym_pause = 0;
if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
phydev->speed = SPEED_1000;
if (lpagb & LPA_1000FULL)
phydev->duplex = DUPLEX_FULL;
} else if (lpa & (LPA_100FULL | LPA_100HALF)) {
phydev->speed = SPEED_100;
if (lpa & LPA_100FULL)
phydev->duplex = DUPLEX_FULL;
} else
if (lpa & LPA_10FULL)
phydev->duplex = DUPLEX_FULL;
if (phydev->duplex == DUPLEX_FULL) {
phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
}
} else {
int bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_FULLDPLX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
if (bmcr & BMCR_SPEED1000)
phydev->speed = SPEED_1000;
else if (bmcr & BMCR_SPEED100)
phydev->speed = SPEED_100;
else
phydev->speed = SPEED_10;
phydev->pause = phydev->asym_pause = 0;
}
return 0;
}
static int genphy_config_init(struct phy_device *phydev)
{
int val;
u32 features;
/* For now, I'll claim that the generic driver supports
* all possible port types */
features = (SUPPORTED_TP | SUPPORTED_MII
| SUPPORTED_AUI | SUPPORTED_FIBRE |
SUPPORTED_BNC);
/* Do we support autonegotiation? */
val = phy_read(phydev, MII_BMSR);
if (val < 0)
return val;
if (val & BMSR_ANEGCAPABLE)
features |= SUPPORTED_Autoneg;
if (val & BMSR_100FULL)
features |= SUPPORTED_100baseT_Full;
if (val & BMSR_100HALF)
features |= SUPPORTED_100baseT_Half;
if (val & BMSR_10FULL)
features |= SUPPORTED_10baseT_Full;
if (val & BMSR_10HALF)
features |= SUPPORTED_10baseT_Half;
if (val & BMSR_ESTATEN) {
val = phy_read(phydev, MII_ESTATUS);
if (val < 0)
return val;
if (val & ESTATUS_1000_TFULL)
features |= SUPPORTED_1000baseT_Full;
if (val & ESTATUS_1000_THALF)
features |= SUPPORTED_1000baseT_Half;
}
phydev->supported = features;
phydev->advertising = features;
return 0;
}
int phy_driver_register(struct phy_driver *phydrv)
{
phydrv->drv.bus = &mdio_bus_type;
if (!phydrv->config_init)
phydrv->config_init = genphy_config_init;
if (!phydrv->config_aneg)
phydrv->config_aneg = genphy_config_aneg;
if (!phydrv->read_status)
phydrv->read_status = genphy_read_status;
return register_driver(&phydrv->drv);
}
View Git Blame Copy Permalink