![Jason Gunthorpe](/assets/img/avatar_default.png)
IEEE 802.3ae clause 45 specifies a somewhat modified MDIO protocol for use by 10GIGE phys. The main change is a 21 bit address split into a 5 bit device ID and a 16 bit register offset. The definition is designed so that normal and extended devices can run on the same MDIO bus. Extend mdio-bitbang to do the new protocol. At the MDIO bus level the protocol is requested by or'ing MII_ADDR_C45 into the register offset. Make phy_read/phy_write/etc pass a full 32 bit register offset. This does not attempt to make the phy layer support C45 style PHYs, just to provide the MDIO bus support. Tested against a Broadcom 10GE phy with ID 0x206034, and several Broadcom 10/100/1000 Phys in normal mode. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: David S. Miller <davem@davemloft.net>
404 lines
8.8 KiB
C
404 lines
8.8 KiB
C
/*
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* drivers/net/phy/mdio_bus.c
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*
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* MDIO Bus interface
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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/kernel.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/device.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/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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/**
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* mdiobus_alloc - allocate a mii_bus structure
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*
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* Description: called by a bus driver to allocate an mii_bus
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* structure to fill in.
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*/
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struct mii_bus *mdiobus_alloc(void)
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{
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struct mii_bus *bus;
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bus = kzalloc(sizeof(*bus), GFP_KERNEL);
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if (bus != NULL)
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bus->state = MDIOBUS_ALLOCATED;
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return bus;
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}
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EXPORT_SYMBOL(mdiobus_alloc);
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/**
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* mdiobus_release - mii_bus device release callback
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* @d: the target struct device that contains the mii_bus
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*
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* Description: called when the last reference to an mii_bus is
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* dropped, to free the underlying memory.
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*/
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static void mdiobus_release(struct device *d)
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{
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struct mii_bus *bus = to_mii_bus(d);
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BUG_ON(bus->state != MDIOBUS_RELEASED &&
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/* for compatibility with error handling in drivers */
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bus->state != MDIOBUS_ALLOCATED);
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kfree(bus);
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}
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static struct class mdio_bus_class = {
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.name = "mdio_bus",
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.dev_release = mdiobus_release,
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};
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/**
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* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
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* @bus: target mii_bus
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*
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* Description: Called by a bus driver to bring up all the PHYs
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* on a given bus, and attach them to the bus.
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*
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* Returns 0 on success or < 0 on error.
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*/
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int mdiobus_register(struct mii_bus *bus)
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{
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int i, err;
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if (NULL == bus || NULL == bus->name ||
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NULL == bus->read ||
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NULL == bus->write)
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return -EINVAL;
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BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
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bus->state != MDIOBUS_UNREGISTERED);
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bus->dev.parent = bus->parent;
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bus->dev.class = &mdio_bus_class;
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bus->dev.groups = NULL;
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dev_set_name(&bus->dev, "%s", bus->id);
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err = device_register(&bus->dev);
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if (err) {
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printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
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return -EINVAL;
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}
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mutex_init(&bus->mdio_lock);
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if (bus->reset)
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bus->reset(bus);
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for (i = 0; i < PHY_MAX_ADDR; i++) {
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if ((bus->phy_mask & (1 << i)) == 0) {
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struct phy_device *phydev;
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phydev = mdiobus_scan(bus, i);
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if (IS_ERR(phydev)) {
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err = PTR_ERR(phydev);
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goto error;
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}
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}
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}
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bus->state = MDIOBUS_REGISTERED;
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pr_info("%s: probed\n", bus->name);
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return 0;
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error:
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while (--i >= 0) {
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if (bus->phy_map[i])
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device_unregister(&bus->phy_map[i]->dev);
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}
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device_del(&bus->dev);
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return err;
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}
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EXPORT_SYMBOL(mdiobus_register);
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void mdiobus_unregister(struct mii_bus *bus)
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{
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int i;
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BUG_ON(bus->state != MDIOBUS_REGISTERED);
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bus->state = MDIOBUS_UNREGISTERED;
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device_del(&bus->dev);
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for (i = 0; i < PHY_MAX_ADDR; i++) {
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if (bus->phy_map[i])
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device_unregister(&bus->phy_map[i]->dev);
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bus->phy_map[i] = NULL;
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}
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}
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EXPORT_SYMBOL(mdiobus_unregister);
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/**
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* mdiobus_free - free a struct mii_bus
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* @bus: mii_bus to free
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*
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* This function releases the reference to the underlying device
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* object in the mii_bus. If this is the last reference, the mii_bus
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* will be freed.
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*/
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void mdiobus_free(struct mii_bus *bus)
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{
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/*
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* For compatibility with error handling in drivers.
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*/
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if (bus->state == MDIOBUS_ALLOCATED) {
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kfree(bus);
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return;
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}
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BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
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bus->state = MDIOBUS_RELEASED;
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put_device(&bus->dev);
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}
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EXPORT_SYMBOL(mdiobus_free);
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struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
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{
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struct phy_device *phydev;
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int err;
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phydev = get_phy_device(bus, addr);
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if (IS_ERR(phydev) || phydev == NULL)
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return phydev;
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err = phy_device_register(phydev);
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if (err) {
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phy_device_free(phydev);
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return NULL;
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}
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return phydev;
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}
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EXPORT_SYMBOL(mdiobus_scan);
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/**
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* mdiobus_read - Convenience function for reading a given MII mgmt register
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* @bus: the mii_bus struct
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* @addr: the phy address
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* @regnum: register number to read
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*
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* NOTE: MUST NOT be called from interrupt context,
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* because the bus read/write functions may wait for an interrupt
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* to conclude the operation.
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*/
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int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
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{
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int retval;
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BUG_ON(in_interrupt());
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mutex_lock(&bus->mdio_lock);
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retval = bus->read(bus, addr, regnum);
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mutex_unlock(&bus->mdio_lock);
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return retval;
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}
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EXPORT_SYMBOL(mdiobus_read);
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/**
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* mdiobus_write - Convenience function for writing a given MII mgmt register
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* @bus: the mii_bus struct
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* @addr: the phy address
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* @regnum: register number to write
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* @val: value to write to @regnum
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*
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* NOTE: MUST NOT be called from interrupt context,
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* because the bus read/write functions may wait for an interrupt
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* to conclude the operation.
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*/
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int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
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{
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int err;
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BUG_ON(in_interrupt());
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mutex_lock(&bus->mdio_lock);
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err = bus->write(bus, addr, regnum, val);
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mutex_unlock(&bus->mdio_lock);
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return err;
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}
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EXPORT_SYMBOL(mdiobus_write);
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/**
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* mdio_bus_match - determine if given PHY driver supports the given PHY device
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* @dev: target PHY device
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* @drv: given PHY driver
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*
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* Description: Given a PHY device, and a PHY driver, return 1 if
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* the driver supports the device. Otherwise, return 0.
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*/
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static int mdio_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct phy_device *phydev = to_phy_device(dev);
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struct phy_driver *phydrv = to_phy_driver(drv);
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return ((phydrv->phy_id & phydrv->phy_id_mask) ==
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(phydev->phy_id & phydrv->phy_id_mask));
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}
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#ifdef CONFIG_PM
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static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
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{
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struct device_driver *drv = phydev->dev.driver;
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struct phy_driver *phydrv = to_phy_driver(drv);
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struct net_device *netdev = phydev->attached_dev;
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if (!drv || !phydrv->suspend)
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return false;
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/* PHY not attached? May suspend. */
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if (!netdev)
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return true;
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/*
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* Don't suspend PHY if the attched netdev parent may wakeup.
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* The parent may point to a PCI device, as in tg3 driver.
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*/
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if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
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return false;
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/*
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* Also don't suspend PHY if the netdev itself may wakeup. This
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* is the case for devices w/o underlaying pwr. mgmt. aware bus,
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* e.g. SoC devices.
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*/
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if (device_may_wakeup(&netdev->dev))
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return false;
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return true;
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}
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static int mdio_bus_suspend(struct device *dev)
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{
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struct phy_driver *phydrv = to_phy_driver(dev->driver);
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struct phy_device *phydev = to_phy_device(dev);
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/*
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* We must stop the state machine manually, otherwise it stops out of
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* control, possibly with the phydev->lock held. Upon resume, netdev
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* may call phy routines that try to grab the same lock, and that may
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* lead to a deadlock.
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*/
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if (phydev->attached_dev)
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phy_stop_machine(phydev);
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if (!mdio_bus_phy_may_suspend(phydev))
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return 0;
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return phydrv->suspend(phydev);
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}
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static int mdio_bus_resume(struct device *dev)
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{
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struct phy_driver *phydrv = to_phy_driver(dev->driver);
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struct phy_device *phydev = to_phy_device(dev);
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int ret;
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if (!mdio_bus_phy_may_suspend(phydev))
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goto no_resume;
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ret = phydrv->resume(phydev);
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if (ret < 0)
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return ret;
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no_resume:
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if (phydev->attached_dev)
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phy_start_machine(phydev, NULL);
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return 0;
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}
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static int mdio_bus_restore(struct device *dev)
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{
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struct phy_device *phydev = to_phy_device(dev);
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struct net_device *netdev = phydev->attached_dev;
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int ret;
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if (!netdev)
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return 0;
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ret = phy_init_hw(phydev);
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if (ret < 0)
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return ret;
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/* The PHY needs to renegotiate. */
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phydev->link = 0;
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phydev->state = PHY_UP;
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phy_start_machine(phydev, NULL);
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return 0;
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}
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static struct dev_pm_ops mdio_bus_pm_ops = {
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.suspend = mdio_bus_suspend,
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.resume = mdio_bus_resume,
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.freeze = mdio_bus_suspend,
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.thaw = mdio_bus_resume,
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.restore = mdio_bus_restore,
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};
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#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
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#else
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#define MDIO_BUS_PM_OPS NULL
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#endif /* CONFIG_PM */
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struct bus_type mdio_bus_type = {
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.name = "mdio_bus",
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.match = mdio_bus_match,
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.pm = MDIO_BUS_PM_OPS,
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};
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EXPORT_SYMBOL(mdio_bus_type);
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int __init mdio_bus_init(void)
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{
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int ret;
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ret = class_register(&mdio_bus_class);
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if (!ret) {
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ret = bus_register(&mdio_bus_type);
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if (ret)
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class_unregister(&mdio_bus_class);
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}
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return ret;
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}
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void mdio_bus_exit(void)
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{
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class_unregister(&mdio_bus_class);
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bus_unregister(&mdio_bus_type);
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}
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