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/sched.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.h>
24 #include <linux/delay.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/skbuff.h>
28 #include <linux/spinlock.h>
30 #include <linux/module.h>
31 #include <linux/mii.h>
32 #include <linux/ethtool.h>
33 #include <linux/phy.h>
37 #include <asm/uaccess.h>
39 #define MII_REGS_NUM 7
42 The idea is to emulate normal phy behavior by responding with
43 pre-defined values to mii BMCR read, so that read_status hook could
44 take all the needed info.
47 struct fixed_phy_status {
53 /*-----------------------------------------------------------------------------
54 * Private information hoder for mii_bus
55 *-----------------------------------------------------------------------------*/
59 struct fixed_phy_status phy_status;
60 struct phy_device *phydev; /* pointer to the container */
62 int(*link_update)(struct net_device*, struct fixed_phy_status*);
66 /*-----------------------------------------------------------------------------
67 * If something weird is required to be done with link/speed,
68 * network driver is able to assign a function to implement this.
69 * May be useful for PHY's that need to be software-driven.
70 *-----------------------------------------------------------------------------*/
71 int fixed_mdio_set_link_update(struct phy_device* phydev,
72 int(*link_update)(struct net_device*, struct fixed_phy_status*))
74 struct fixed_info *fixed;
76 if(link_update == NULL)
81 fixed = phydev->bus->priv;
82 fixed->link_update = link_update;
88 EXPORT_SYMBOL(fixed_mdio_set_link_update);
90 /*-----------------------------------------------------------------------------
91 * This is used for updating internal mii regs from the status
92 *-----------------------------------------------------------------------------*/
93 static int fixed_mdio_update_regs(struct fixed_info *fixed)
95 u16 *regs = fixed->regs;
100 printk(KERN_ERR "%s: regs not set up", __FUNCTION__);
104 if(fixed->phy_status.link)
105 bmsr |= BMSR_LSTATUS;
107 if(fixed->phy_status.duplex) {
108 bmcr |= BMCR_FULLDPLX;
110 switch ( fixed->phy_status.speed ) {
112 bmsr |= BMSR_100FULL;
113 bmcr |= BMCR_SPEED100;
121 switch ( fixed->phy_status.speed ) {
123 bmsr |= BMSR_100HALF;
124 bmcr |= BMCR_SPEED100;
128 bmsr |= BMSR_100HALF;
133 regs[MII_BMCR] = bmcr;
134 regs[MII_BMSR] = bmsr | 0x800; /*we are always capable of 10 hdx*/
139 static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location)
141 struct fixed_info *fixed = bus->priv;
143 /* if user has registered link update callback, use it */
145 if(fixed->phydev->attached_dev) {
146 if(fixed->link_update) {
147 fixed->link_update(fixed->phydev->attached_dev,
149 fixed_mdio_update_regs(fixed);
153 if ((unsigned int)location >= fixed->regs_num)
155 return fixed->regs[location];
158 static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
160 /* do nothing for now*/
164 static int fixed_mii_reset(struct mii_bus *bus)
166 /*nothing here - no way/need to reset it*/
170 static int fixed_config_aneg(struct phy_device *phydev)
172 /* :TODO:03/13/2006 09:45:37 PM::
173 The full autoneg funcionality can be emulated,
174 but no need to have anything here for now
179 /*-----------------------------------------------------------------------------
180 * the manual bind will do the magic - with phy_id_mask == 0
181 * match will never return true...
182 *-----------------------------------------------------------------------------*/
183 static struct phy_driver fixed_mdio_driver = {
185 .features = PHY_BASIC_FEATURES,
186 .config_aneg = fixed_config_aneg,
187 .read_status = genphy_read_status,
188 .driver = { .owner = THIS_MODULE,},
191 /*-----------------------------------------------------------------------------
192 * This func is used to create all the necessary stuff, bind
193 * the fixed phy driver and register all it on the mdio_bus_type.
194 * speed is either 10 or 100, duplex is boolean.
195 * number is used to create multiple fixed PHYs, so that several devices can
196 * utilize them simultaneously.
197 *-----------------------------------------------------------------------------*/
198 static int fixed_mdio_register_device(int number, int speed, int duplex)
200 struct mii_bus *new_bus;
201 struct fixed_info *fixed;
202 struct phy_device *phydev;
205 struct device* dev = kzalloc(sizeof(struct device), GFP_KERNEL);
210 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
212 if (NULL == new_bus) {
216 fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
224 fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL);
225 fixed->regs_num = MII_REGS_NUM;
226 fixed->phy_status.speed = speed;
227 fixed->phy_status.duplex = duplex;
228 fixed->phy_status.link = 1;
230 new_bus->name = "Fixed MII Bus",
231 new_bus->read = &fixed_mii_read,
232 new_bus->write = &fixed_mii_write,
233 new_bus->reset = &fixed_mii_reset,
236 fixed_mdio_update_regs(fixed);
237 new_bus->priv = fixed;
240 dev_set_drvdata(dev, new_bus);
242 /* create phy_device and register it on the mdio bus */
243 phydev = phy_device_create(new_bus, 0, 0);
246 Put the phydev pointer into the fixed pack so that bus read/write code could
247 be able to access for instance attached netdev. Well it doesn't have to do
248 so, only in case of utilizing user-specified link-update...
250 fixed->phydev = phydev;
254 goto device_create_fail;
258 phydev->dev.bus = &mdio_bus_type;
261 snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
262 "fixed_%d@%d:%d", number, speed, duplex);
264 snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
265 "fixed@%d:%d", speed, duplex);
266 phydev->bus = new_bus;
268 err = device_register(&phydev->dev);
270 printk(KERN_ERR "Phy %s failed to register\n",
272 goto bus_register_fail;
276 the mdio bus has phy_id match... In order not to do it
277 artificially, we are binding the driver here by hand;
278 it will be the same for all the fixed phys anyway.
280 down_write(&phydev->dev.bus->subsys.rwsem);
282 phydev->dev.driver = &fixed_mdio_driver.driver;
284 err = phydev->dev.driver->probe(&phydev->dev);
286 printk(KERN_ERR "Phy %s: problems with fixed driver\n",phydev->dev.bus_id);
287 up_write(&phydev->dev.bus->subsys.rwsem);
291 err = device_bind_driver(&phydev->dev);
293 up_write(&phydev->dev.bus->subsys.rwsem);
301 device_unregister(&phydev->dev);
313 MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
314 MODULE_AUTHOR("Vitaly Bordug");
315 MODULE_LICENSE("GPL");
317 static int __init fixed_init(void)
324 /* register on the bus... Not expected to be matched with anything there... */
325 phy_driver_register(&fixed_mdio_driver);
327 /* So let the fun begin...
328 We will create several mdio devices here, and will bound the upper
331 Then the external software can lookup the phy bus by searching
332 fixed@speed:duplex, e.g. fixed@100:1, to be connected to the
333 virtual 100M Fdx phy.
335 In case several virtual PHYs required, the bus_id will be in form
336 fixed_<num>@<speed>:<duplex>, which make it able even to define
337 driver-specific link control callback, if for instance PHY is completely
342 #ifdef CONFIG_FIXED_MII_DUPLEX
348 #ifdef CONFIG_FIXED_MII_100_FDX
349 fixed_mdio_register_device(0, 100, 1);
352 #ifdef CONFIX_FIXED_MII_10_FDX
353 fixed_mdio_register_device(0, 10, 1);
358 static void __exit fixed_exit(void)
360 phy_driver_unregister(&fixed_mdio_driver);
361 /* :WARNING:02/18/2006 04:32:40 AM:: Cleanup all the created stuff */
364 module_init(fixed_init);
365 module_exit(fixed_exit);