2 * drivers/net/phy/fixed.c
4 * Driver for fixed PHYs, when transceiver is able to operate in one fixed mode.
6 * Author: Vitaly Bordug
8 * Copyright (c) 2006 MontaVista Software, Inc.
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <linux/errno.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/interrupt.h>
22 #include <linux/init.h>
23 #include <linux/delay.h>
24 #include <linux/netdevice.h>
25 #include <linux/etherdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/spinlock.h>
29 #include <linux/module.h>
30 #include <linux/mii.h>
31 #include <linux/ethtool.h>
32 #include <linux/phy.h>
36 #include <asm/uaccess.h>
38 #define MII_REGS_NUM 7
41 The idea is to emulate normal phy behavior by responding with
42 pre-defined values to mii BMCR read, so that read_status hook could
43 take all the needed info.
46 struct fixed_phy_status {
52 /*-----------------------------------------------------------------------------
53 * Private information hoder for mii_bus
54 *-----------------------------------------------------------------------------*/
58 struct fixed_phy_status phy_status;
59 struct phy_device *phydev; /* pointer to the container */
61 int(*link_update)(struct net_device*, struct fixed_phy_status*);
65 /*-----------------------------------------------------------------------------
66 * If something weird is required to be done with link/speed,
67 * network driver is able to assign a function to implement this.
68 * May be useful for PHY's that need to be software-driven.
69 *-----------------------------------------------------------------------------*/
70 int fixed_mdio_set_link_update(struct phy_device* phydev,
71 int(*link_update)(struct net_device*, struct fixed_phy_status*))
73 struct fixed_info *fixed;
75 if(link_update == NULL)
80 fixed = phydev->bus->priv;
81 fixed->link_update = link_update;
87 EXPORT_SYMBOL(fixed_mdio_set_link_update);
89 /*-----------------------------------------------------------------------------
90 * This is used for updating internal mii regs from the status
91 *-----------------------------------------------------------------------------*/
92 static int fixed_mdio_update_regs(struct fixed_info *fixed)
94 u16 *regs = fixed->regs;
99 printk(KERN_ERR "%s: regs not set up", __FUNCTION__);
103 if(fixed->phy_status.link)
104 bmsr |= BMSR_LSTATUS;
106 if(fixed->phy_status.duplex) {
107 bmcr |= BMCR_FULLDPLX;
109 switch ( fixed->phy_status.speed ) {
111 bmsr |= BMSR_100FULL;
112 bmcr |= BMCR_SPEED100;
120 switch ( fixed->phy_status.speed ) {
122 bmsr |= BMSR_100HALF;
123 bmcr |= BMCR_SPEED100;
127 bmsr |= BMSR_100HALF;
132 regs[MII_BMCR] = bmcr;
133 regs[MII_BMSR] = bmsr | 0x800; /*we are always capable of 10 hdx*/
138 static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location)
140 struct fixed_info *fixed = bus->priv;
142 /* if user has registered link update callback, use it */
144 if(fixed->phydev->attached_dev) {
145 if(fixed->link_update) {
146 fixed->link_update(fixed->phydev->attached_dev,
148 fixed_mdio_update_regs(fixed);
152 if ((unsigned int)location >= fixed->regs_num)
154 return fixed->regs[location];
157 static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
159 /* do nothing for now*/
163 static int fixed_mii_reset(struct mii_bus *bus)
165 /*nothing here - no way/need to reset it*/
169 static int fixed_config_aneg(struct phy_device *phydev)
171 /* :TODO:03/13/2006 09:45:37 PM::
172 The full autoneg funcionality can be emulated,
173 but no need to have anything here for now
178 /*-----------------------------------------------------------------------------
179 * the manual bind will do the magic - with phy_id_mask == 0
180 * match will never return true...
181 *-----------------------------------------------------------------------------*/
182 static struct phy_driver fixed_mdio_driver = {
184 .features = PHY_BASIC_FEATURES,
185 .config_aneg = fixed_config_aneg,
186 .read_status = genphy_read_status,
187 .driver = { .owner = THIS_MODULE,},
190 /*-----------------------------------------------------------------------------
191 * This func is used to create all the necessary stuff, bind
192 * the fixed phy driver and register all it on the mdio_bus_type.
193 * speed is either 10 or 100, duplex is boolean.
194 * number is used to create multiple fixed PHYs, so that several devices can
195 * utilize them simultaneously.
196 *-----------------------------------------------------------------------------*/
197 static int fixed_mdio_register_device(int number, int speed, int duplex)
199 struct mii_bus *new_bus;
200 struct fixed_info *fixed;
201 struct phy_device *phydev;
204 struct device* dev = kzalloc(sizeof(struct device), GFP_KERNEL);
209 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
211 if (NULL == new_bus) {
215 fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
223 fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL);
224 fixed->regs_num = MII_REGS_NUM;
225 fixed->phy_status.speed = speed;
226 fixed->phy_status.duplex = duplex;
227 fixed->phy_status.link = 1;
229 new_bus->name = "Fixed MII Bus",
230 new_bus->read = &fixed_mii_read,
231 new_bus->write = &fixed_mii_write,
232 new_bus->reset = &fixed_mii_reset,
235 fixed_mdio_update_regs(fixed);
236 new_bus->priv = fixed;
239 dev_set_drvdata(dev, new_bus);
241 /* create phy_device and register it on the mdio bus */
242 phydev = phy_device_create(new_bus, 0, 0);
245 Put the phydev pointer into the fixed pack so that bus read/write code could
246 be able to access for instance attached netdev. Well it doesn't have to do
247 so, only in case of utilizing user-specified link-update...
249 fixed->phydev = phydev;
253 goto device_create_fail;
256 phydev->irq = PHY_IGNORE_INTERRUPT;
257 phydev->dev.bus = &mdio_bus_type;
260 snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
261 "fixed_%d@%d:%d", number, speed, duplex);
263 snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
264 "fixed@%d:%d", speed, duplex);
265 phydev->bus = new_bus;
267 err = device_register(&phydev->dev);
269 printk(KERN_ERR "Phy %s failed to register\n",
271 goto bus_register_fail;
275 the mdio bus has phy_id match... In order not to do it
276 artificially, we are binding the driver here by hand;
277 it will be the same for all the fixed phys anyway.
279 phydev->dev.driver = &fixed_mdio_driver.driver;
281 err = phydev->dev.driver->probe(&phydev->dev);
283 printk(KERN_ERR "Phy %s: problems with fixed driver\n",phydev->dev.bus_id);
287 err = device_bind_driver(&phydev->dev);
294 device_unregister(&phydev->dev);
306 MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
307 MODULE_AUTHOR("Vitaly Bordug");
308 MODULE_LICENSE("GPL");
310 static int __init fixed_init(void)
317 /* register on the bus... Not expected to be matched with anything there... */
318 phy_driver_register(&fixed_mdio_driver);
320 /* So let the fun begin...
321 We will create several mdio devices here, and will bound the upper
324 Then the external software can lookup the phy bus by searching
325 fixed@speed:duplex, e.g. fixed@100:1, to be connected to the
326 virtual 100M Fdx phy.
328 In case several virtual PHYs required, the bus_id will be in form
329 fixed_<num>@<speed>:<duplex>, which make it able even to define
330 driver-specific link control callback, if for instance PHY is completely
335 #ifdef CONFIG_FIXED_MII_DUPLEX
341 #ifdef CONFIG_FIXED_MII_100_FDX
342 fixed_mdio_register_device(0, 100, 1);
345 #ifdef CONFIG_FIXED_MII_10_FDX
346 fixed_mdio_register_device(0, 10, 1);
351 static void __exit fixed_exit(void)
353 phy_driver_unregister(&fixed_mdio_driver);
354 /* :WARNING:02/18/2006 04:32:40 AM:: Cleanup all the created stuff */
357 module_init(fixed_init);
358 module_exit(fixed_exit);