This patch adds a PHY Abstraction Layer to the Linux Kernel, enabling
ethernet drivers to remain as ignorant as is reasonable of the connected PHY's design and operation details. Signed-off-by: Andy Fleming <afleming@freescale.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Andy Fleming
committed by
Jeff Garzik
Jeff Garzik
parent
b0825488a6
commit
00db8189d9
682
drivers/net/phy/phy_device.c
Normal file
682
drivers/net/phy/phy_device.c
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@@ -0,0 +1,682 @@
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/*
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* drivers/net/phy/phy_device.c
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*
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* Framework for finding and configuring PHYs.
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* Also contains generic PHY driver
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*
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* Author: Andy Fleming
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*
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* Copyright (c) 2004 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/phy.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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/* get_phy_device
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*
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* description: Reads the ID registers of the PHY at addr on the
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* bus, then allocates and returns the phy_device to
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* represent it.
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*/
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struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
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{
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int phy_reg;
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u32 phy_id;
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struct phy_device *dev = NULL;
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/* Grab the bits from PHYIR1, and put them
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* in the upper half */
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phy_reg = bus->read(bus, addr, MII_PHYSID1);
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if (phy_reg < 0)
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return ERR_PTR(phy_reg);
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phy_id = (phy_reg & 0xffff) << 16;
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/* Grab the bits from PHYIR2, and put them in the lower half */
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phy_reg = bus->read(bus, addr, MII_PHYSID2);
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if (phy_reg < 0)
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return ERR_PTR(phy_reg);
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phy_id |= (phy_reg & 0xffff);
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/* If the phy_id is all Fs, there is no device there */
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if (0xffffffff == phy_id)
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return NULL;
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/* Otherwise, we allocate the device, and initialize the
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* default values */
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dev = kcalloc(1, sizeof(*dev), GFP_KERNEL);
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if (NULL == dev)
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return ERR_PTR(-ENOMEM);
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dev->speed = 0;
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dev->duplex = -1;
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dev->pause = dev->asym_pause = 0;
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dev->link = 1;
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dev->autoneg = AUTONEG_ENABLE;
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dev->addr = addr;
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dev->phy_id = phy_id;
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dev->bus = bus;
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dev->state = PHY_DOWN;
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spin_lock_init(&dev->lock);
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return dev;
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}
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/* phy_prepare_link:
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*
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* description: Tells the PHY infrastructure to handle the
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* gory details on monitoring link status (whether through
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* polling or an interrupt), and to call back to the
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* connected device driver when the link status changes.
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* If you want to monitor your own link state, don't call
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* this function */
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void phy_prepare_link(struct phy_device *phydev,
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void (*handler)(struct net_device *))
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{
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phydev->adjust_link = handler;
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}
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#ifdef CONFIG_PHYCONTROL
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/* phy_connect:
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*
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* description: Convenience function for connecting ethernet
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* devices to PHY devices. The default behavior is for
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* the PHY infrastructure to handle everything, and only notify
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* the connected driver when the link status changes. If you
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* don't want, or can't use the provided functionality, you may
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* choose to call only the subset of functions which provide
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* the desired functionality.
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*/
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struct phy_device * phy_connect(struct net_device *dev, const char *phy_id,
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void (*handler)(struct net_device *), u32 flags)
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{
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struct phy_device *phydev;
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phydev = phy_attach(dev, phy_id, flags);
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if (IS_ERR(phydev))
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return phydev;
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phy_prepare_link(phydev, handler);
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phy_start_machine(phydev, NULL);
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if (phydev->irq > 0)
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phy_start_interrupts(phydev);
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return phydev;
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}
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EXPORT_SYMBOL(phy_connect);
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void phy_disconnect(struct phy_device *phydev)
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{
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if (phydev->irq > 0)
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phy_stop_interrupts(phydev);
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phy_stop_machine(phydev);
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phydev->adjust_link = NULL;
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phy_detach(phydev);
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}
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EXPORT_SYMBOL(phy_disconnect);
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#endif /* CONFIG_PHYCONTROL */
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/* phy_attach:
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*
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* description: Called by drivers to attach to a particular PHY
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* device. The phy_device is found, and properly hooked up
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* to the phy_driver. If no driver is attached, then the
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* genphy_driver is used. The phy_device is given a ptr to
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* the attaching device, and given a callback for link status
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* change. The phy_device is returned to the attaching
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* driver.
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*/
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static int phy_compare_id(struct device *dev, void *data)
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{
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return strcmp((char *)data, dev->bus_id) ? 0 : 1;
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}
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struct phy_device *phy_attach(struct net_device *dev,
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const char *phy_id, u32 flags)
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{
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struct bus_type *bus = &mdio_bus_type;
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struct phy_device *phydev;
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struct device *d;
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/* Search the list of PHY devices on the mdio bus for the
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* PHY with the requested name */
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d = bus_find_device(bus, NULL, (void *)phy_id, phy_compare_id);
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if (d) {
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phydev = to_phy_device(d);
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} else {
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printk(KERN_ERR "%s not found\n", phy_id);
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return ERR_PTR(-ENODEV);
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}
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/* Assume that if there is no driver, that it doesn't
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* exist, and we should use the genphy driver. */
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if (NULL == d->driver) {
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int err;
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down_write(&d->bus->subsys.rwsem);
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d->driver = &genphy_driver.driver;
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err = d->driver->probe(d);
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if (err < 0)
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return ERR_PTR(err);
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device_bind_driver(d);
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up_write(&d->bus->subsys.rwsem);
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}
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if (phydev->attached_dev) {
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printk(KERN_ERR "%s: %s already attached\n",
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dev->name, phy_id);
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return ERR_PTR(-EBUSY);
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}
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phydev->attached_dev = dev;
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phydev->dev_flags = flags;
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return phydev;
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}
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EXPORT_SYMBOL(phy_attach);
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void phy_detach(struct phy_device *phydev)
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{
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phydev->attached_dev = NULL;
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/* If the device had no specific driver before (i.e. - it
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* was using the generic driver), we unbind the device
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* from the generic driver so that there's a chance a
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* real driver could be loaded */
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if (phydev->dev.driver == &genphy_driver.driver) {
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down_write(&phydev->dev.bus->subsys.rwsem);
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device_release_driver(&phydev->dev);
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up_write(&phydev->dev.bus->subsys.rwsem);
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}
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}
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EXPORT_SYMBOL(phy_detach);
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/* Generic PHY support and helper functions */
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/* genphy_config_advert
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*
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* description: Writes MII_ADVERTISE with the appropriate values,
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* after sanitizing the values to make sure we only advertise
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* what is supported
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*/
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int genphy_config_advert(struct phy_device *phydev)
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{
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u32 advertise;
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int adv;
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int err;
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/* Only allow advertising what
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* this PHY supports */
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phydev->advertising &= phydev->supported;
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advertise = phydev->advertising;
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/* Setup standard advertisement */
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adv = phy_read(phydev, MII_ADVERTISE);
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if (adv < 0)
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return adv;
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adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
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ADVERTISE_PAUSE_ASYM);
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if (advertise & ADVERTISED_10baseT_Half)
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adv |= ADVERTISE_10HALF;
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if (advertise & ADVERTISED_10baseT_Full)
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adv |= ADVERTISE_10FULL;
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if (advertise & ADVERTISED_100baseT_Half)
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adv |= ADVERTISE_100HALF;
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if (advertise & ADVERTISED_100baseT_Full)
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adv |= ADVERTISE_100FULL;
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if (advertise & ADVERTISED_Pause)
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adv |= ADVERTISE_PAUSE_CAP;
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if (advertise & ADVERTISED_Asym_Pause)
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adv |= ADVERTISE_PAUSE_ASYM;
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err = phy_write(phydev, MII_ADVERTISE, adv);
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if (err < 0)
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return err;
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/* Configure gigabit if it's supported */
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if (phydev->supported & (SUPPORTED_1000baseT_Half |
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SUPPORTED_1000baseT_Full)) {
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adv = phy_read(phydev, MII_CTRL1000);
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if (adv < 0)
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return adv;
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adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
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if (advertise & SUPPORTED_1000baseT_Half)
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adv |= ADVERTISE_1000HALF;
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if (advertise & SUPPORTED_1000baseT_Full)
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adv |= ADVERTISE_1000FULL;
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err = phy_write(phydev, MII_CTRL1000, adv);
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if (err < 0)
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return err;
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}
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return adv;
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}
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EXPORT_SYMBOL(genphy_config_advert);
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/* genphy_setup_forced
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*
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* description: Configures MII_BMCR to force speed/duplex
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* to the values in phydev. Assumes that the values are valid.
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* Please see phy_sanitize_settings() */
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int genphy_setup_forced(struct phy_device *phydev)
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{
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int ctl = BMCR_RESET;
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phydev->pause = phydev->asym_pause = 0;
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if (SPEED_1000 == phydev->speed)
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ctl |= BMCR_SPEED1000;
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else if (SPEED_100 == phydev->speed)
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ctl |= BMCR_SPEED100;
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if (DUPLEX_FULL == phydev->duplex)
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ctl |= BMCR_FULLDPLX;
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ctl = phy_write(phydev, MII_BMCR, ctl);
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if (ctl < 0)
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return ctl;
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/* We just reset the device, so we'd better configure any
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* settings the PHY requires to operate */
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if (phydev->drv->config_init)
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ctl = phydev->drv->config_init(phydev);
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return ctl;
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}
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/* Enable and Restart Autonegotiation */
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int genphy_restart_aneg(struct phy_device *phydev)
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{
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int ctl;
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ctl = phy_read(phydev, MII_BMCR);
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if (ctl < 0)
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return ctl;
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ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
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/* Don't isolate the PHY if we're negotiating */
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ctl &= ~(BMCR_ISOLATE);
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ctl = phy_write(phydev, MII_BMCR, ctl);
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return ctl;
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}
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/* genphy_config_aneg
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*
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* description: If auto-negotiation is enabled, we configure the
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* advertising, and then restart auto-negotiation. If it is not
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* enabled, then we write the BMCR
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*/
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int genphy_config_aneg(struct phy_device *phydev)
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{
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int err = 0;
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if (AUTONEG_ENABLE == phydev->autoneg) {
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err = genphy_config_advert(phydev);
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if (err < 0)
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return err;
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err = genphy_restart_aneg(phydev);
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} else
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err = genphy_setup_forced(phydev);
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return err;
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}
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EXPORT_SYMBOL(genphy_config_aneg);
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/* genphy_update_link
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*
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* description: Update the value in phydev->link to reflect the
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* current link value. In order to do this, we need to read
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* the status register twice, keeping the second value
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*/
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int genphy_update_link(struct phy_device *phydev)
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{
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int status;
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/* Do a fake read */
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status = phy_read(phydev, MII_BMSR);
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if (status < 0)
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return status;
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/* Read link and autonegotiation status */
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status = phy_read(phydev, MII_BMSR);
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if (status < 0)
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return status;
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if ((status & BMSR_LSTATUS) == 0)
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phydev->link = 0;
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else
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phydev->link = 1;
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return 0;
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}
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/* genphy_read_status
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*
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* description: Check the link, then figure out the current state
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* by comparing what we advertise with what the link partner
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* advertises. Start by checking the gigabit possibilities,
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* then move on to 10/100.
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*/
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int genphy_read_status(struct phy_device *phydev)
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{
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int adv;
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int err;
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int lpa;
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int lpagb = 0;
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/* Update the link, but return if there
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* was an error */
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err = genphy_update_link(phydev);
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if (err)
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return err;
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if (AUTONEG_ENABLE == phydev->autoneg) {
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if (phydev->supported & (SUPPORTED_1000baseT_Half
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| SUPPORTED_1000baseT_Full)) {
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lpagb = phy_read(phydev, MII_STAT1000);
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if (lpagb < 0)
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return lpagb;
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adv = phy_read(phydev, MII_CTRL1000);
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if (adv < 0)
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return adv;
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lpagb &= adv << 2;
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}
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lpa = phy_read(phydev, MII_LPA);
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if (lpa < 0)
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return lpa;
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adv = phy_read(phydev, MII_ADVERTISE);
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if (adv < 0)
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return adv;
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lpa &= adv;
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phydev->speed = SPEED_10;
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phydev->duplex = DUPLEX_HALF;
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phydev->pause = phydev->asym_pause = 0;
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if (lpagb & (LPA_1000FULL | LPA_1000HALF)) {
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phydev->speed = SPEED_1000;
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if (lpagb & LPA_1000FULL)
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phydev->duplex = DUPLEX_FULL;
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} else if (lpa & (LPA_100FULL | LPA_100HALF)) {
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phydev->speed = SPEED_100;
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if (lpa & LPA_100FULL)
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phydev->duplex = DUPLEX_FULL;
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} else
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if (lpa & LPA_10FULL)
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phydev->duplex = DUPLEX_FULL;
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if (phydev->duplex == DUPLEX_FULL){
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phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
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phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
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}
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} else {
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int bmcr = phy_read(phydev, MII_BMCR);
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if (bmcr < 0)
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return bmcr;
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if (bmcr & BMCR_FULLDPLX)
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phydev->duplex = DUPLEX_FULL;
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else
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phydev->duplex = DUPLEX_HALF;
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if (bmcr & BMCR_SPEED1000)
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phydev->speed = SPEED_1000;
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else if (bmcr & BMCR_SPEED100)
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phydev->speed = SPEED_100;
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else
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phydev->speed = SPEED_10;
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phydev->pause = phydev->asym_pause = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL(genphy_read_status);
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|
||||
static int genphy_config_init(struct phy_device *phydev)
|
||||
{
|
||||
u32 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;
|
||||
}
|
||||
|
||||
|
||||
/* phy_probe
|
||||
*
|
||||
* description: Take care of setting up the phy_device structure,
|
||||
* set the state to READY (the driver's init function should
|
||||
* set it to STARTING if needed).
|
||||
*/
|
||||
static int phy_probe(struct device *dev)
|
||||
{
|
||||
struct phy_device *phydev;
|
||||
struct phy_driver *phydrv;
|
||||
struct device_driver *drv;
|
||||
int err = 0;
|
||||
|
||||
phydev = to_phy_device(dev);
|
||||
|
||||
/* Make sure the driver is held.
|
||||
* XXX -- Is this correct? */
|
||||
drv = get_driver(phydev->dev.driver);
|
||||
phydrv = to_phy_driver(drv);
|
||||
phydev->drv = phydrv;
|
||||
|
||||
/* Disable the interrupt if the PHY doesn't support it */
|
||||
if (!(phydrv->flags & PHY_HAS_INTERRUPT))
|
||||
phydev->irq = PHY_POLL;
|
||||
|
||||
spin_lock(&phydev->lock);
|
||||
|
||||
/* Start out supporting everything. Eventually,
|
||||
* a controller will attach, and may modify one
|
||||
* or both of these values */
|
||||
phydev->supported = phydrv->features;
|
||||
phydev->advertising = phydrv->features;
|
||||
|
||||
/* Set the state to READY by default */
|
||||
phydev->state = PHY_READY;
|
||||
|
||||
if (phydev->drv->probe)
|
||||
err = phydev->drv->probe(phydev);
|
||||
|
||||
spin_unlock(&phydev->lock);
|
||||
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
if (phydev->drv->config_init)
|
||||
err = phydev->drv->config_init(phydev);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int phy_remove(struct device *dev)
|
||||
{
|
||||
struct phy_device *phydev;
|
||||
|
||||
phydev = to_phy_device(dev);
|
||||
|
||||
spin_lock(&phydev->lock);
|
||||
phydev->state = PHY_DOWN;
|
||||
spin_unlock(&phydev->lock);
|
||||
|
||||
if (phydev->drv->remove)
|
||||
phydev->drv->remove(phydev);
|
||||
|
||||
put_driver(dev->driver);
|
||||
phydev->drv = NULL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int phy_driver_register(struct phy_driver *new_driver)
|
||||
{
|
||||
int retval;
|
||||
|
||||
memset(&new_driver->driver, 0, sizeof(new_driver->driver));
|
||||
new_driver->driver.name = new_driver->name;
|
||||
new_driver->driver.bus = &mdio_bus_type;
|
||||
new_driver->driver.probe = phy_probe;
|
||||
new_driver->driver.remove = phy_remove;
|
||||
|
||||
retval = driver_register(&new_driver->driver);
|
||||
|
||||
if (retval) {
|
||||
printk(KERN_ERR "%s: Error %d in registering driver\n",
|
||||
new_driver->name, retval);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
pr_info("%s: Registered new driver\n", new_driver->name);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(phy_driver_register);
|
||||
|
||||
void phy_driver_unregister(struct phy_driver *drv)
|
||||
{
|
||||
driver_unregister(&drv->driver);
|
||||
}
|
||||
EXPORT_SYMBOL(phy_driver_unregister);
|
||||
|
||||
static struct phy_driver genphy_driver = {
|
||||
.phy_id = 0xffffffff,
|
||||
.phy_id_mask = 0xffffffff,
|
||||
.name = "Generic PHY",
|
||||
.config_init = genphy_config_init,
|
||||
.features = 0,
|
||||
.config_aneg = genphy_config_aneg,
|
||||
.read_status = genphy_read_status,
|
||||
.driver = {.owner = THIS_MODULE, },
|
||||
};
|
||||
|
||||
static int __init genphy_init(void)
|
||||
{
|
||||
return phy_driver_register(&genphy_driver);
|
||||
|
||||
}
|
||||
|
||||
static void __exit genphy_exit(void)
|
||||
{
|
||||
phy_driver_unregister(&genphy_driver);
|
||||
}
|
||||
|
||||
module_init(genphy_init);
|
||||
module_exit(genphy_exit);
|
||||
Reference in New Issue
Block a user