android_kernel_xiaomi_sm8350/drivers/net/phy/mdio_bus.c
Lennert Buytenhek 4fd5f812c2 phylib: allow incremental scanning of an mii bus
This patch splits the bus scanning code in mdiobus_register() off
into a separate function, and makes this function available for
calling from external code.  This allows incrementally scanning an
mii bus, e.g. as information about which addresses are 'safe' to
scan becomes available.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Andy Fleming <afleming@freescale.com>
2008-09-19 05:13:54 +02:00

191 lines
4.0 KiB
C

/*
* drivers/net/phy/mdio_bus.c
*
* MDIO Bus interface
*
* Author: Andy Fleming
*
* Copyright (c) 2004 Freescale Semiconductor, 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 <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
/**
* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
* @bus: target mii_bus
*
* Description: Called by a bus driver to bring up all the PHYs
* on a given bus, and attach them to the bus.
*
* Returns 0 on success or < 0 on error.
*/
int mdiobus_register(struct mii_bus *bus)
{
int i;
int err = 0;
if (NULL == bus || NULL == bus->name ||
NULL == bus->read ||
NULL == bus->write)
return -EINVAL;
mutex_init(&bus->mdio_lock);
if (bus->reset)
bus->reset(bus);
for (i = 0; i < PHY_MAX_ADDR; i++) {
bus->phy_map[i] = NULL;
if ((bus->phy_mask & (1 << i)) == 0) {
struct phy_device *phydev;
phydev = mdiobus_scan(bus, i);
if (IS_ERR(phydev))
err = PTR_ERR(phydev);
}
}
pr_info("%s: probed\n", bus->name);
return err;
}
EXPORT_SYMBOL(mdiobus_register);
void mdiobus_unregister(struct mii_bus *bus)
{
int i;
for (i = 0; i < PHY_MAX_ADDR; i++) {
if (bus->phy_map[i])
device_unregister(&bus->phy_map[i]->dev);
}
}
EXPORT_SYMBOL(mdiobus_unregister);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
{
struct phy_device *phydev;
int err;
phydev = get_phy_device(bus, addr);
if (IS_ERR(phydev) || phydev == NULL)
return phydev;
/* There's a PHY at this address
* We need to set:
* 1) IRQ
* 2) bus_id
* 3) parent
* 4) bus
* 5) mii_bus
* And, we need to register it */
phydev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
phydev->dev.parent = bus->dev;
phydev->dev.bus = &mdio_bus_type;
snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, addr);
phydev->bus = bus;
/* Run all of the fixups for this PHY */
phy_scan_fixups(phydev);
err = device_register(&phydev->dev);
if (err) {
printk(KERN_ERR "phy %d failed to register\n", addr);
phy_device_free(phydev);
phydev = NULL;
}
bus->phy_map[addr] = phydev;
return phydev;
}
EXPORT_SYMBOL(mdiobus_scan);
/**
* mdio_bus_match - determine if given PHY driver supports the given PHY device
* @dev: target PHY device
* @drv: given PHY driver
*
* Description: Given a PHY device, and a PHY driver, return 1 if
* the driver supports the device. Otherwise, return 0.
*/
static int mdio_bus_match(struct device *dev, struct device_driver *drv)
{
struct phy_device *phydev = to_phy_device(dev);
struct phy_driver *phydrv = to_phy_driver(drv);
return ((phydrv->phy_id & phydrv->phy_id_mask) ==
(phydev->phy_id & phydrv->phy_id_mask));
}
/* Suspend and resume. Copied from platform_suspend and
* platform_resume
*/
static int mdio_bus_suspend(struct device * dev, pm_message_t state)
{
int ret = 0;
struct device_driver *drv = dev->driver;
if (drv && drv->suspend)
ret = drv->suspend(dev, state);
return ret;
}
static int mdio_bus_resume(struct device * dev)
{
int ret = 0;
struct device_driver *drv = dev->driver;
if (drv && drv->resume)
ret = drv->resume(dev);
return ret;
}
struct bus_type mdio_bus_type = {
.name = "mdio_bus",
.match = mdio_bus_match,
.suspend = mdio_bus_suspend,
.resume = mdio_bus_resume,
};
EXPORT_SYMBOL(mdio_bus_type);
int __init mdio_bus_init(void)
{
return bus_register(&mdio_bus_type);
}
void mdio_bus_exit(void)
{
bus_unregister(&mdio_bus_type);
}