366 lines
8.9 KiB
C
366 lines
8.9 KiB
C
/*
|
|
* drivers/net/phy/fixed.c
|
|
*
|
|
* Driver for fixed PHYs, when transceiver is able to operate in one fixed mode.
|
|
*
|
|
* Author: Vitaly Bordug
|
|
*
|
|
* Copyright (c) 2006 MontaVista Software, 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/sched.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>
|
|
|
|
#define MII_REGS_NUM 7
|
|
|
|
/*
|
|
The idea is to emulate normal phy behavior by responding with
|
|
pre-defined values to mii BMCR read, so that read_status hook could
|
|
take all the needed info.
|
|
*/
|
|
|
|
struct fixed_phy_status {
|
|
u8 link;
|
|
u16 speed;
|
|
u8 duplex;
|
|
};
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* Private information hoder for mii_bus
|
|
*-----------------------------------------------------------------------------*/
|
|
struct fixed_info {
|
|
u16 *regs;
|
|
u8 regs_num;
|
|
struct fixed_phy_status phy_status;
|
|
struct phy_device *phydev; /* pointer to the container */
|
|
/* link & speed cb */
|
|
int(*link_update)(struct net_device*, struct fixed_phy_status*);
|
|
|
|
};
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* If something weird is required to be done with link/speed,
|
|
* network driver is able to assign a function to implement this.
|
|
* May be useful for PHY's that need to be software-driven.
|
|
*-----------------------------------------------------------------------------*/
|
|
int fixed_mdio_set_link_update(struct phy_device* phydev,
|
|
int(*link_update)(struct net_device*, struct fixed_phy_status*))
|
|
{
|
|
struct fixed_info *fixed;
|
|
|
|
if(link_update == NULL)
|
|
return -EINVAL;
|
|
|
|
if(phydev) {
|
|
if(phydev->bus) {
|
|
fixed = phydev->bus->priv;
|
|
fixed->link_update = link_update;
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(fixed_mdio_set_link_update);
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* This is used for updating internal mii regs from the status
|
|
*-----------------------------------------------------------------------------*/
|
|
static int fixed_mdio_update_regs(struct fixed_info *fixed)
|
|
{
|
|
u16 *regs = fixed->regs;
|
|
u16 bmsr = 0;
|
|
u16 bmcr = 0;
|
|
|
|
if(!regs) {
|
|
printk(KERN_ERR "%s: regs not set up", __FUNCTION__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if(fixed->phy_status.link)
|
|
bmsr |= BMSR_LSTATUS;
|
|
|
|
if(fixed->phy_status.duplex) {
|
|
bmcr |= BMCR_FULLDPLX;
|
|
|
|
switch ( fixed->phy_status.speed ) {
|
|
case 100:
|
|
bmsr |= BMSR_100FULL;
|
|
bmcr |= BMCR_SPEED100;
|
|
break;
|
|
|
|
case 10:
|
|
bmsr |= BMSR_10FULL;
|
|
break;
|
|
}
|
|
} else {
|
|
switch ( fixed->phy_status.speed ) {
|
|
case 100:
|
|
bmsr |= BMSR_100HALF;
|
|
bmcr |= BMCR_SPEED100;
|
|
break;
|
|
|
|
case 10:
|
|
bmsr |= BMSR_100HALF;
|
|
break;
|
|
}
|
|
}
|
|
|
|
regs[MII_BMCR] = bmcr;
|
|
regs[MII_BMSR] = bmsr | 0x800; /*we are always capable of 10 hdx*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location)
|
|
{
|
|
struct fixed_info *fixed = bus->priv;
|
|
|
|
/* if user has registered link update callback, use it */
|
|
if(fixed->phydev)
|
|
if(fixed->phydev->attached_dev) {
|
|
if(fixed->link_update) {
|
|
fixed->link_update(fixed->phydev->attached_dev,
|
|
&fixed->phy_status);
|
|
fixed_mdio_update_regs(fixed);
|
|
}
|
|
}
|
|
|
|
if ((unsigned int)location >= fixed->regs_num)
|
|
return -1;
|
|
return fixed->regs[location];
|
|
}
|
|
|
|
static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
|
|
{
|
|
/* do nothing for now*/
|
|
return 0;
|
|
}
|
|
|
|
static int fixed_mii_reset(struct mii_bus *bus)
|
|
{
|
|
/*nothing here - no way/need to reset it*/
|
|
return 0;
|
|
}
|
|
|
|
static int fixed_config_aneg(struct phy_device *phydev)
|
|
{
|
|
/* :TODO:03/13/2006 09:45:37 PM::
|
|
The full autoneg funcionality can be emulated,
|
|
but no need to have anything here for now
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* the manual bind will do the magic - with phy_id_mask == 0
|
|
* match will never return true...
|
|
*-----------------------------------------------------------------------------*/
|
|
static struct phy_driver fixed_mdio_driver = {
|
|
.name = "Fixed PHY",
|
|
.features = PHY_BASIC_FEATURES,
|
|
.config_aneg = fixed_config_aneg,
|
|
.read_status = genphy_read_status,
|
|
.driver = { .owner = THIS_MODULE,},
|
|
};
|
|
|
|
/*-----------------------------------------------------------------------------
|
|
* This func is used to create all the necessary stuff, bind
|
|
* the fixed phy driver and register all it on the mdio_bus_type.
|
|
* speed is either 10 or 100, duplex is boolean.
|
|
* number is used to create multiple fixed PHYs, so that several devices can
|
|
* utilize them simultaneously.
|
|
*-----------------------------------------------------------------------------*/
|
|
static int fixed_mdio_register_device(int number, int speed, int duplex)
|
|
{
|
|
struct mii_bus *new_bus;
|
|
struct fixed_info *fixed;
|
|
struct phy_device *phydev;
|
|
int err = 0;
|
|
|
|
struct device* dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
|
|
if (NULL == dev)
|
|
return -ENOMEM;
|
|
|
|
new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
|
|
|
|
if (NULL == new_bus) {
|
|
kfree(dev);
|
|
return -ENOMEM;
|
|
}
|
|
fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
|
|
|
|
if (NULL == fixed) {
|
|
kfree(dev);
|
|
kfree(new_bus);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL);
|
|
fixed->regs_num = MII_REGS_NUM;
|
|
fixed->phy_status.speed = speed;
|
|
fixed->phy_status.duplex = duplex;
|
|
fixed->phy_status.link = 1;
|
|
|
|
new_bus->name = "Fixed MII Bus",
|
|
new_bus->read = &fixed_mii_read,
|
|
new_bus->write = &fixed_mii_write,
|
|
new_bus->reset = &fixed_mii_reset,
|
|
|
|
/*set up workspace*/
|
|
fixed_mdio_update_regs(fixed);
|
|
new_bus->priv = fixed;
|
|
|
|
new_bus->dev = dev;
|
|
dev_set_drvdata(dev, new_bus);
|
|
|
|
/* create phy_device and register it on the mdio bus */
|
|
phydev = phy_device_create(new_bus, 0, 0);
|
|
|
|
/*
|
|
Put the phydev pointer into the fixed pack so that bus read/write code could
|
|
be able to access for instance attached netdev. Well it doesn't have to do
|
|
so, only in case of utilizing user-specified link-update...
|
|
*/
|
|
fixed->phydev = phydev;
|
|
|
|
if(NULL == phydev) {
|
|
err = -ENOMEM;
|
|
goto device_create_fail;
|
|
}
|
|
|
|
phydev->irq = PHY_IGNORE_INTERRUPT;
|
|
phydev->dev.bus = &mdio_bus_type;
|
|
|
|
if(number)
|
|
snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
|
|
"fixed_%d@%d:%d", number, speed, duplex);
|
|
else
|
|
snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
|
|
"fixed@%d:%d", speed, duplex);
|
|
phydev->bus = new_bus;
|
|
|
|
err = device_register(&phydev->dev);
|
|
if(err) {
|
|
printk(KERN_ERR "Phy %s failed to register\n",
|
|
phydev->dev.bus_id);
|
|
goto bus_register_fail;
|
|
}
|
|
|
|
/*
|
|
the mdio bus has phy_id match... In order not to do it
|
|
artificially, we are binding the driver here by hand;
|
|
it will be the same for all the fixed phys anyway.
|
|
*/
|
|
down_write(&phydev->dev.bus->subsys.rwsem);
|
|
|
|
phydev->dev.driver = &fixed_mdio_driver.driver;
|
|
|
|
err = phydev->dev.driver->probe(&phydev->dev);
|
|
if(err < 0) {
|
|
printk(KERN_ERR "Phy %s: problems with fixed driver\n",phydev->dev.bus_id);
|
|
up_write(&phydev->dev.bus->subsys.rwsem);
|
|
goto probe_fail;
|
|
}
|
|
|
|
err = device_bind_driver(&phydev->dev);
|
|
|
|
up_write(&phydev->dev.bus->subsys.rwsem);
|
|
|
|
if (err)
|
|
goto probe_fail;
|
|
|
|
return 0;
|
|
|
|
probe_fail:
|
|
device_unregister(&phydev->dev);
|
|
bus_register_fail:
|
|
kfree(phydev);
|
|
device_create_fail:
|
|
kfree(dev);
|
|
kfree(new_bus);
|
|
kfree(fixed);
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
|
|
MODULE_AUTHOR("Vitaly Bordug");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __init fixed_init(void)
|
|
{
|
|
#if 0
|
|
int ret;
|
|
int duplex = 0;
|
|
#endif
|
|
|
|
/* register on the bus... Not expected to be matched with anything there... */
|
|
phy_driver_register(&fixed_mdio_driver);
|
|
|
|
/* So let the fun begin...
|
|
We will create several mdio devices here, and will bound the upper
|
|
driver to them.
|
|
|
|
Then the external software can lookup the phy bus by searching
|
|
fixed@speed:duplex, e.g. fixed@100:1, to be connected to the
|
|
virtual 100M Fdx phy.
|
|
|
|
In case several virtual PHYs required, the bus_id will be in form
|
|
fixed_<num>@<speed>:<duplex>, which make it able even to define
|
|
driver-specific link control callback, if for instance PHY is completely
|
|
SW-driven.
|
|
|
|
*/
|
|
|
|
#ifdef CONFIG_FIXED_MII_DUPLEX
|
|
#if 0
|
|
duplex = 1;
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_FIXED_MII_100_FDX
|
|
fixed_mdio_register_device(0, 100, 1);
|
|
#endif
|
|
|
|
#ifdef CONFIG_FIXED_MII_10_FDX
|
|
fixed_mdio_register_device(0, 10, 1);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static void __exit fixed_exit(void)
|
|
{
|
|
phy_driver_unregister(&fixed_mdio_driver);
|
|
/* :WARNING:02/18/2006 04:32:40 AM:: Cleanup all the created stuff */
|
|
}
|
|
|
|
module_init(fixed_init);
|
|
module_exit(fixed_exit);
|