linux/drivers/net/phy/fixed.c
Vitaly Bordug a79d8e93d3 phy/fixed.c: rework to not duplicate PHY layer functionality
With that patch fixed.c now fully emulates MDIO bus, thus no need
to duplicate PHY layer functionality. That, in turn, drastically
simplifies the code, and drops down line count.

As an additional bonus, now there is no need to register MDIO bus
for each PHY, all emulated PHYs placed on the platform fixed MDIO bus.
There is also no more need to pre-allocate PHYs via .config option,
this is all now handled dynamically.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Vitaly Bordug <vitb@kernel.crashing.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-01-23 19:33:58 -06:00

254 lines
5.3 KiB
C

/*
* Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
*
* Author: Vitaly Bordug <vbordug@ru.mvista.com>
* Anton Vorontsov <avorontsov@ru.mvista.com>
*
* Copyright (c) 2006-2007 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/module.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#define MII_REGS_NUM 29
struct fixed_mdio_bus {
int irqs[PHY_MAX_ADDR];
struct mii_bus mii_bus;
struct list_head phys;
};
struct fixed_phy {
int id;
u16 regs[MII_REGS_NUM];
struct phy_device *phydev;
struct fixed_phy_status status;
int (*link_update)(struct net_device *, struct fixed_phy_status *);
struct list_head node;
};
static struct platform_device *pdev;
static struct fixed_mdio_bus platform_fmb = {
.phys = LIST_HEAD_INIT(platform_fmb.phys),
};
static int fixed_phy_update_regs(struct fixed_phy *fp)
{
u16 bmsr = BMSR_ANEGCAPABLE;
u16 bmcr = 0;
u16 lpagb = 0;
u16 lpa = 0;
if (fp->status.duplex) {
bmcr |= BMCR_FULLDPLX;
switch (fp->status.speed) {
case 1000:
bmsr |= BMSR_ESTATEN;
bmcr |= BMCR_SPEED1000;
lpagb |= LPA_1000FULL;
break;
case 100:
bmsr |= BMSR_100FULL;
bmcr |= BMCR_SPEED100;
lpa |= LPA_100FULL;
break;
case 10:
bmsr |= BMSR_10FULL;
lpa |= LPA_10FULL;
break;
default:
printk(KERN_WARNING "fixed phy: unknown speed\n");
return -EINVAL;
}
} else {
switch (fp->status.speed) {
case 1000:
bmsr |= BMSR_ESTATEN;
bmcr |= BMCR_SPEED1000;
lpagb |= LPA_1000HALF;
break;
case 100:
bmsr |= BMSR_100HALF;
bmcr |= BMCR_SPEED100;
lpa |= LPA_100HALF;
break;
case 10:
bmsr |= BMSR_10HALF;
lpa |= LPA_10HALF;
break;
default:
printk(KERN_WARNING "fixed phy: unknown speed\n");
return -EINVAL;
}
}
if (fp->status.link)
bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
if (fp->status.pause)
lpa |= LPA_PAUSE_CAP;
if (fp->status.asym_pause)
lpa |= LPA_PAUSE_ASYM;
fp->regs[MII_PHYSID1] = fp->id >> 16;
fp->regs[MII_PHYSID2] = fp->id;
fp->regs[MII_BMSR] = bmsr;
fp->regs[MII_BMCR] = bmcr;
fp->regs[MII_LPA] = lpa;
fp->regs[MII_STAT1000] = lpagb;
return 0;
}
static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num)
{
struct fixed_mdio_bus *fmb = container_of(bus, struct fixed_mdio_bus,
mii_bus);
struct fixed_phy *fp;
if (reg_num >= MII_REGS_NUM)
return -1;
list_for_each_entry(fp, &fmb->phys, node) {
if (fp->id == phy_id) {
/* Issue callback if user registered it. */
if (fp->link_update) {
fp->link_update(fp->phydev->attached_dev,
&fp->status);
fixed_phy_update_regs(fp);
}
return fp->regs[reg_num];
}
}
return 0xFFFF;
}
static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num,
u16 val)
{
return 0;
}
/*
* 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_phy_set_link_update(struct phy_device *phydev,
int (*link_update)(struct net_device *,
struct fixed_phy_status *))
{
struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp;
if (!link_update || !phydev || !phydev->bus)
return -EINVAL;
list_for_each_entry(fp, &fmb->phys, node) {
if (fp->id == phydev->phy_id) {
fp->link_update = link_update;
fp->phydev = phydev;
return 0;
}
}
return -ENOENT;
}
EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
int fixed_phy_add(unsigned int irq, int phy_id,
struct fixed_phy_status *status)
{
int ret;
struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp;
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
if (!fp)
return -ENOMEM;
memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
fmb->irqs[phy_id] = irq;
fp->id = phy_id;
fp->status = *status;
ret = fixed_phy_update_regs(fp);
if (ret)
goto err_regs;
list_add_tail(&fp->node, &fmb->phys);
return 0;
err_regs:
kfree(fp);
return ret;
}
EXPORT_SYMBOL_GPL(fixed_phy_add);
static int __init fixed_mdio_bus_init(void)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
int ret;
pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
if (!pdev) {
ret = -ENOMEM;
goto err_pdev;
}
fmb->mii_bus.id = 0;
fmb->mii_bus.name = "Fixed MDIO Bus";
fmb->mii_bus.dev = &pdev->dev;
fmb->mii_bus.read = &fixed_mdio_read;
fmb->mii_bus.write = &fixed_mdio_write;
fmb->mii_bus.irq = fmb->irqs;
ret = mdiobus_register(&fmb->mii_bus);
if (ret)
goto err_mdiobus_reg;
return 0;
err_mdiobus_reg:
platform_device_unregister(pdev);
err_pdev:
return ret;
}
module_init(fixed_mdio_bus_init);
static void __exit fixed_mdio_bus_exit(void)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp;
mdiobus_unregister(&fmb->mii_bus);
platform_device_unregister(pdev);
list_for_each_entry(fp, &fmb->phys, node) {
list_del(&fp->node);
kfree(fp);
}
}
module_exit(fixed_mdio_bus_exit);
MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
MODULE_AUTHOR("Vitaly Bordug");
MODULE_LICENSE("GPL");