/*
* 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/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 <linux/phy_fixed.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
/* we need to track the allocated pointers in order to free them on exit */
static struct fixed_info *fixed_phy_ptrs[CONFIG_FIXED_MII_AMNT*MAX_PHY_AMNT];
/*-----------------------------------------------------------------------------
* 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);
struct fixed_info *fixed_mdio_get_phydev (int phydev_ind)
{
if (phydev_ind >= MAX_PHY_AMNT)
return NULL;
return fixed_phy_ptrs[phydev_ind];
}
EXPORT_SYMBOL(fixed_mdio_get_phydev);
/*-----------------------------------------------------------------------------
* This is used for updating internal mii regs from the status
*-----------------------------------------------------------------------------*/
#if defined(CONFIG_FIXED_MII_100_FDX) || defined(CONFIG_FIXED_MII_10_FDX) || defined(CONFIG_FIXED_MII_1000_FDX)
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;
}
#endif
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",
#ifdef CONFIG_FIXED_MII_1000_FDX
.features = PHY_GBIT_FEATURES,
#else
.features = PHY_BASIC_FEATURES,
#endif
.config_aneg = fixed_config_aneg,
.read_status = genphy_read_status,
.driver = { .owner = THIS_MODULE, },
};
static void fixed_mdio_release(struct device *dev)
{
struct phy_device *phydev = container_of(dev, struct phy_device, dev);
struct mii_bus *bus = phydev->bus;
struct fixed_info *fixed = bus->priv;
kfree(phydev);
kfree(bus->dev);
kfree(bus);
kfree(fixed->regs);
kfree(fixed);
}
/*-----------------------------------------------------------------------------
* 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 or 1000, duplex is boolean.
* number is used to create multiple fixed PHYs, so that several devices can
* utilize them simultaneously.
*
* The device on mdio bus will look like [bus_id]:[phy_id],
* bus_id = number
* phy_id = speed+duplex.
*-----------------------------------------------------------------------------*/
#if defined(CONFIG_FIXED_MII_100_FDX) || defined(CONFIG_FIXED_MII_10_FDX) || defined(CONFIG_FIXED_MII_1000_FDX)
struct fixed_info *fixed_mdio_register_device(
int bus_id, int speed, int duplex, u8 phy_id)
{
struct mii_bus *new_bus;
struct fixed_info *fixed;
struct phy_device *phydev;
int err;
struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
if (dev == NULL)
goto err_dev_alloc;
new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
if (new_bus == NULL)
goto err_bus_alloc;
fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
if (fixed == NULL)
goto err_fixed_alloc;
fixed->regs = kzalloc(MII_REGS_NUM * sizeof(int), GFP_KERNEL);
if (NULL == fixed->regs)
goto err_fixed_regs_alloc;
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);
if (phydev == NULL)
goto err_phy_dev_create;
/*
* 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;
phydev->speed = speed;
phydev->duplex = duplex;
phydev->irq = PHY_IGNORE_INTERRUPT;
phydev->dev.bus = &mdio_bus_type;
snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
PHY_ID_FMT, bus_id, phy_id);
phydev->bus = new_bus;
phydev->dev.driver = &fixed_mdio_driver.driver;
phydev->dev.release = fixed_mdio_release;
err = phydev->dev.driver->probe(&phydev->dev);
if (err < 0) {
printk(KERN_ERR "Phy %s: problems with fixed driver\n",
phydev->dev.bus_id);
goto err_out;
}
err = device_register(&phydev->dev);
if (err) {
printk(KERN_ERR "Phy %s failed to register\n",
phydev->dev.bus_id);
goto err_out;
}
//phydev->state = PHY_RUNNING; /* make phy go up quick, but in 10Mbit/HDX
return fixed;
err_out:
kfree(phydev);
err_phy_dev_create:
kfree(fixed->regs);
err_fixed_regs_alloc:
kfree(fixed);
err_fixed_alloc:
kfree(new_bus);
err_bus_alloc:
kfree(dev);
err_dev_alloc:
return NULL;
}
#endif
MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
MODULE_AUTHOR("Vitaly Bordug");
MODULE_LICENSE("GPL");
static int __init fixed_init(void)
{
int cnt = 0;
int i;
/* register on the bus... Not expected to be matched
* with anything there...
*
*/
phy_driver_register(&fixed_mdio_driver);
/* 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
* for 0:101, to be connected to the virtual 100M Fdx phy.
*
* In case several virtual PHYs required, the bus_id will be in form
* [num]:[duplex]+[speed], which make it able even to define
* driver-specific link control callback, if for instance PHY is
* completely SW-driven.
*/
for (i=1; i <= CONFIG_FIXED_MII_AMNT; i++) {
#ifdef CONFIG_FIXED_MII_1000_FDX
fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(0, 1000, 1, i);
#endif
#ifdef CONFIG_FIXED_MII_100_FDX
fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(1, 100, 1, i);
#endif
#ifdef CONFIG_FIXED_MII_10_FDX
fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(2, 10, 1, i);
#endif
}
return 0;
}
static void __exit fixed_exit(void)
{
int i;
phy_driver_unregister(&fixed_mdio_driver);
for (i=0; i < MAX_PHY_AMNT; i++)
if ( fixed_phy_ptrs[i] )
device_unregister(&fixed_phy_ptrs[i]->phydev->dev);
}
module_init(fixed_init);
module_exit(fixed_exit);
