/* * drivers/net/phy/phy_device.c * * Framework for finding and configuring PHYs. * Also contains generic PHY driver * * 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 <linux/kernel.h>#include <linux/string.h>#include <linux/errno.h>#include <linux/unistd.h>#include <linux/slab.h>#include <linux/interrupt.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/skbuff.h>#include <linux/spinlock.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/mii.h>#include <linux/ethtool.h>#include <linux/phy.h> #include <asm/io.h>#include <asm/irq.h>#include <asm/uaccess.h> MODULE_DESCRIPTION("PHY library");MODULE_AUTHOR("Andy Fleming");MODULE_LICENSE("GPL"); static struct phy_driver genphy_driver;extern int mdio_bus_init(void);extern void mdio_bus_exit(void); 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->interface = PHY_INTERFACE_MODE_GMII; dev->autoneg = AUTONEG_ENABLE; dev->addr = addr; dev->phy_id = phy_id; dev->bus = bus; dev->state = PHY_DOWN; spin_lock_init(&dev->lock); return dev;}EXPORT_SYMBOL(phy_device_create); /* get_phy_device * * 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){ int phy_reg; u32 phy_id; struct phy_device *dev = NULL; /* Grab the bits from PHYIR1, and put them * in the upper half */ phy_reg = bus->read(bus, addr, MII_PHYSID1); if (phy_reg < 0) return ERR_PTR(phy_reg); phy_id = (phy_reg & 0xffff) << 16; /* Grab the bits from PHYIR2, and put them in the lower half */ phy_reg = bus->read(bus, addr, MII_PHYSID2); if (phy_reg < 0) return ERR_PTR(phy_reg); phy_id |= (phy_reg & 0xffff); /* If the phy_id is all Fs, there is no device there */ if (0xffffffff == phy_id) return NULL; dev = phy_device_create(bus, addr, phy_id); return dev;} /* phy_prepare_link: * * description: Tells the PHY infrastructure to handle the * gory details on monitoring link status (whether through * polling or an interrupt), and to call back to the * connected device driver when the link status changes. * If you want to monitor your own link state, don't call * this function */void phy_prepare_link(struct phy_device *phydev, void (*handler)(struct net_device *)){ phydev->adjust_link = handler;} /* phy_connect: * * description: Convenience function for connecting ethernet * devices to PHY devices. The default behavior is for * the PHY infrastructure to handle everything, and only notify * the connected driver when the link status changes. If you * don't want, or can't use the provided functionality, you may * choose to call only the subset of functions which provide * the desired functionality. */struct phy_device * phy_connect(struct net_device *dev, const char *phy_id, void (*handler)(struct net_device *), u32 flags, phy_interface_t interface){ struct phy_device *phydev; phydev = phy_attach(dev, phy_id, flags, interface); if (IS_ERR(phydev)) return phydev; phy_prepare_link(phydev, handler); phy_start_machine(phydev, NULL); if (phydev->irq > 0) phy_start_interrupts(phydev); return phydev;}EXPORT_SYMBOL(phy_connect); void phy_disconnect(struct phy_device *phydev){ if (phydev->irq > 0) phy_stop_interrupts(phydev); phy_stop_machine(phydev); phydev->adjust_link = NULL; phy_detach(phydev);}EXPORT_SYMBOL(phy_disconnect); /* phy_attach: * * description: Called by drivers to attach to a particular PHY * device. The phy_device is found, and properly hooked up * to the phy_driver. If no driver is attached, then the * genphy_driver is used. The phy_device is given a ptr to * the attaching device, and given a callback for link status * change. The phy_device is returned to the attaching * driver. */static int phy_compare_id(struct device *dev, void *data){ return strcmp((char *)data, dev->bus_id) ? 0 : 1;} struct phy_device *phy_attach(struct net_device *dev, const char *phy_id, u32 flags, phy_interface_t interface){ struct bus_type *bus = &mdio_bus_type; struct phy_device *phydev; struct device *d; /* Search the list of PHY devices on the mdio bus for the * PHY with the requested name */ d = bus_find_device(bus, NULL, (void *)phy_id, phy_compare_id); if (d) { phydev = to_phy_device(d); } else { printk(KERN_ERR "%s not found\n", phy_id); return ERR_PTR(-ENODEV); } /* Assume that if there is no driver, that it doesn't * exist, and we should use the genphy driver. */ if (NULL == d->driver) { int err; down_write(&d->bus->subsys.rwsem); d->driver = &genphy_driver.driver; err = d->driver->probe(d); if (err >= 0) err = device_bind_driver(d); up_write(&d->bus->subsys.rwsem); if (err) return ERR_PTR(err); } if (phydev->attached_dev) { printk(KERN_ERR "%s: %s already attached\n", dev->name, phy_id); return ERR_PTR(-EBUSY); } phydev->attached_dev = dev; phydev->dev_flags = flags; phydev->interface = interface; /* Do initial configuration here, now that * we have certain key parameters * (dev_flags and interface) */ if (phydev->drv->config_init) { int err; err = phydev->drv->config_init(phydev); if (err < 0) return ERR_PTR(err); } return phydev;}EXPORT_SYMBOL(phy_attach); void phy_detach(struct phy_device *phydev){ phydev->attached_dev = NULL; /* If the device had no specific driver before (i.e. - it * was using the generic driver), we unbind the device * from the generic driver so that there's a chance a * real driver could be loaded */ if (phydev->dev.driver == &genphy_driver.driver) { down_write(&phydev->dev.bus->subsys.rwsem); device_release_driver(&phydev->dev); up_write(&phydev->dev.bus->subsys.rwsem); }}EXPORT_SYMBOL(phy_detach); /* Generic PHY support and helper functions */ /* genphy_config_advert * * description: Writes MII_ADVERTISE with the appropriate values, * after sanitizing the values to make sure we only advertise * what is supported */int genphy_config_advert(struct phy_device *phydev){ u32 advertise; int adv; int err; /* Only allow advertising what * this PHY supports */ phydev->advertising &= phydev->supported; advertise = phydev->advertising; /* Setup standard advertisement */ adv = phy_read(phydev, 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; err = phy_write(phydev, MII_ADVERTISE, adv); if (err < 0) return err; /* Configure gigabit if it's supported */ if (phydev->supported & (SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full)) { adv = phy_read(phydev, MII_CTRL1000); if (adv < 0) return adv; adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); if (advertise & SUPPORTED_1000baseT_Half) adv |= ADVERTISE_1000HALF; if (advertise & SUPPORTED_1000baseT_Full) adv |= ADVERTISE_1000FULL; err = phy_write(phydev, MII_CTRL1000, adv); if (err < 0) return err; } return adv;}EXPORT_SYMBOL(genphy_config_advert); /* genphy_setup_forced * * 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 ctl = BMCR_RESET; 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; ctl = phy_write(phydev, MII_BMCR, ctl); if (ctl < 0) return ctl; /* We just reset the device, so we'd better configure any * settings the PHY requires to operate */ if (phydev->drv->config_init) ctl = phydev->drv->config_init(phydev); return ctl;} /* Enable and Restart Autonegotiation */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); return ctl;} /* genphy_config_aneg * * 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 err = 0; if (AUTONEG_ENABLE == phydev->autoneg) { err = genphy_config_advert(phydev); if (err < 0) return err; err = genphy_restart_aneg(phydev); } else err = genphy_setup_forced(phydev); return err;}EXPORT_SYMBOL(genphy_config_aneg); /* genphy_update_link * * 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; /* 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;}EXPORT_SYMBOL(genphy_update_link); /* genphy_read_status * * 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;Lines 1–500 of 717. Load more
/* * drivers/net/phy/phy_device.c * * Framework for finding and configuring PHYs. * Also contains generic PHY driver * * 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 <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/mii.h> #include <linux/ethtool.h> #include <linux/phy.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> MODULE_DESCRIPTION("PHY library"); MODULE_AUTHOR("Andy Fleming"); MODULE_LICENSE("GPL"); static struct phy_driver genphy_driver; extern int mdio_bus_init(void); extern void mdio_bus_exit(void); 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->interface = PHY_INTERFACE_MODE_GMII; dev->autoneg = AUTONEG_ENABLE; dev->addr = addr; dev->phy_id = phy_id; dev->bus = bus; dev->state = PHY_DOWN; spin_lock_init(&dev->lock); return dev; } EXPORT_SYMBOL(phy_device_create); /* get_phy_device * * 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) { int phy_reg; u32 phy_id; struct phy_device *dev = NULL; /* Grab the bits from PHYIR1, and put them * in the upper half */ phy_reg = bus->read(bus, addr, MII_PHYSID1); if (phy_reg < 0) return ERR_PTR(phy_reg); phy_id = (phy_reg & 0xffff) << 16; /* Grab the bits from PHYIR2, and put them in the lower half */ phy_reg = bus->read(bus, addr, MII_PHYSID2); if (phy_reg < 0) return ERR_PTR(phy_reg); phy_id |= (phy_reg & 0xffff); /* If the phy_id is all Fs, there is no device there */ if (0xffffffff == phy_id) return NULL; dev = phy_device_create(bus, addr, phy_id); return dev; } /* phy_prepare_link: * * description: Tells the PHY infrastructure to handle the * gory details on monitoring link status (whether through * polling or an interrupt), and to call back to the * connected device driver when the link status changes. * If you want to monitor your own link state, don't call * this function */ void phy_prepare_link(struct phy_device *phydev, void (*handler)(struct net_device *)) { phydev->adjust_link = handler; } /* phy_connect: * * description: Convenience function for connecting ethernet * devices to PHY devices. The default behavior is for * the PHY infrastructure to handle everything, and only notify * the connected driver when the link status changes. If you * don't want, or can't use the provided functionality, you may * choose to call only the subset of functions which provide * the desired functionality. */ struct phy_device * phy_connect(struct net_device *dev, const char *phy_id, void (*handler)(struct net_device *), u32 flags, phy_interface_t interface) { struct phy_device *phydev; phydev = phy_attach(dev, phy_id, flags, interface); if (IS_ERR(phydev)) return phydev; phy_prepare_link(phydev, handler); phy_start_machine(phydev, NULL); if (phydev->irq > 0) phy_start_interrupts(phydev); return phydev; } EXPORT_SYMBOL(phy_connect); void phy_disconnect(struct phy_device *phydev) { if (phydev->irq > 0) phy_stop_interrupts(phydev); phy_stop_machine(phydev); phydev->adjust_link = NULL; phy_detach(phydev); } EXPORT_SYMBOL(phy_disconnect); /* phy_attach: * * description: Called by drivers to attach to a particular PHY * device. The phy_device is found, and properly hooked up * to the phy_driver. If no driver is attached, then the * genphy_driver is used. The phy_device is given a ptr to * the attaching device, and given a callback for link status * change. The phy_device is returned to the attaching * driver. */ static int phy_compare_id(struct device *dev, void *data) { return strcmp((char *)data, dev->bus_id) ? 0 : 1; } struct phy_device *phy_attach(struct net_device *dev, const char *phy_id, u32 flags, phy_interface_t interface) { struct bus_type *bus = &mdio_bus_type; struct phy_device *phydev; struct device *d; /* Search the list of PHY devices on the mdio bus for the * PHY with the requested name */ d = bus_find_device(bus, NULL, (void *)phy_id, phy_compare_id); if (d) { phydev = to_phy_device(d); } else { printk(KERN_ERR "%s not found\n", phy_id); return ERR_PTR(-ENODEV); } /* Assume that if there is no driver, that it doesn't * exist, and we should use the genphy driver. */ if (NULL == d->driver) { int err; down_write(&d->bus->subsys.rwsem); d->driver = &genphy_driver.driver; err = d->driver->probe(d); if (err >= 0) err = device_bind_driver(d); up_write(&d->bus->subsys.rwsem); if (err) return ERR_PTR(err); } if (phydev->attached_dev) { printk(KERN_ERR "%s: %s already attached\n", dev->name, phy_id); return ERR_PTR(-EBUSY); } phydev->attached_dev = dev; phydev->dev_flags = flags; phydev->interface = interface; /* Do initial configuration here, now that * we have certain key parameters * (dev_flags and interface) */ if (phydev->drv->config_init) { int err; err = phydev->drv->config_init(phydev); if (err < 0) return ERR_PTR(err); } return phydev; } EXPORT_SYMBOL(phy_attach); void phy_detach(struct phy_device *phydev) { phydev->attached_dev = NULL; /* If the device had no specific driver before (i.e. - it * was using the generic driver), we unbind the device * from the generic driver so that there's a chance a * real driver could be loaded */ if (phydev->dev.driver == &genphy_driver.driver) { down_write(&phydev->dev.bus->subsys.rwsem); device_release_driver(&phydev->dev); up_write(&phydev->dev.bus->subsys.rwsem); } } EXPORT_SYMBOL(phy_detach); /* Generic PHY support and helper functions */ /* genphy_config_advert * * description: Writes MII_ADVERTISE with the appropriate values, * after sanitizing the values to make sure we only advertise * what is supported */ int genphy_config_advert(struct phy_device *phydev) { u32 advertise; int adv; int err; /* Only allow advertising what * this PHY supports */ phydev->advertising &= phydev->supported; advertise = phydev->advertising; /* Setup standard advertisement */ adv = phy_read(phydev, 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; err = phy_write(phydev, MII_ADVERTISE, adv); if (err < 0) return err; /* Configure gigabit if it's supported */ if (phydev->supported & (SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full)) { adv = phy_read(phydev, MII_CTRL1000); if (adv < 0) return adv; adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); if (advertise & SUPPORTED_1000baseT_Half) adv |= ADVERTISE_1000HALF; if (advertise & SUPPORTED_1000baseT_Full) adv |= ADVERTISE_1000FULL; err = phy_write(phydev, MII_CTRL1000, adv); if (err < 0) return err; } return adv; } EXPORT_SYMBOL(genphy_config_advert); /* genphy_setup_forced * * 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 ctl = BMCR_RESET; 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; ctl = phy_write(phydev, MII_BMCR, ctl); if (ctl < 0) return ctl; /* We just reset the device, so we'd better configure any * settings the PHY requires to operate */ if (phydev->drv->config_init) ctl = phydev->drv->config_init(phydev); return ctl; } /* Enable and Restart Autonegotiation */ 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); return ctl; } /* genphy_config_aneg * * 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 err = 0; if (AUTONEG_ENABLE == phydev->autoneg) { err = genphy_config_advert(phydev); if (err < 0) return err; err = genphy_restart_aneg(phydev); } else err = genphy_setup_forced(phydev); return err; } EXPORT_SYMBOL(genphy_config_aneg); /* genphy_update_link * * 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; /* 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; } EXPORT_SYMBOL(genphy_update_link); /* genphy_read_status * * 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;