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>
33 #include <linux/phy_fixed.h>
37 #include <asm/uaccess.h>
39 /* we need to track the allocated pointers in order to free them on exit */
40 static struct fixed_info *fixed_phy_ptrs[CONFIG_FIXED_MII_AMNT*MAX_PHY_AMNT];
42 /*-----------------------------------------------------------------------------
43 * If something weird is required to be done with link/speed,
44 * network driver is able to assign a function to implement this.
45 * May be useful for PHY's that need to be software-driven.
46 *-----------------------------------------------------------------------------*/
47 int fixed_mdio_set_link_update(struct phy_device *phydev,
48 int (*link_update) (struct net_device *,
49 struct fixed_phy_status *))
51 struct fixed_info *fixed;
53 if (link_update == NULL)
58 fixed = phydev->bus->priv;
59 fixed->link_update = link_update;
66 EXPORT_SYMBOL(fixed_mdio_set_link_update);
68 struct fixed_info *fixed_mdio_get_phydev (int phydev_ind)
70 if (phydev_ind >= MAX_PHY_AMNT)
72 return fixed_phy_ptrs[phydev_ind];
75 EXPORT_SYMBOL(fixed_mdio_get_phydev);
77 /*-----------------------------------------------------------------------------
78 * This is used for updating internal mii regs from the status
79 *-----------------------------------------------------------------------------*/
80 #if defined(CONFIG_FIXED_MII_100_FDX) || defined(CONFIG_FIXED_MII_10_FDX) || defined(CONFIG_FIXED_MII_1000_FDX)
81 static int fixed_mdio_update_regs(struct fixed_info *fixed)
83 u16 *regs = fixed->regs;
88 printk(KERN_ERR "%s: regs not set up", __FUNCTION__);
92 if (fixed->phy_status.link)
95 if (fixed->phy_status.duplex) {
96 bmcr |= BMCR_FULLDPLX;
98 switch (fixed->phy_status.speed) {
100 bmsr |= BMSR_100FULL;
101 bmcr |= BMCR_SPEED100;
109 switch (fixed->phy_status.speed) {
111 bmsr |= BMSR_100HALF;
112 bmcr |= BMCR_SPEED100;
116 bmsr |= BMSR_100HALF;
121 regs[MII_BMCR] = bmcr;
122 regs[MII_BMSR] = bmsr | 0x800; /*we are always capable of 10 hdx */
127 static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location)
129 struct fixed_info *fixed = bus->priv;
131 /* if user has registered link update callback, use it */
133 if (fixed->phydev->attached_dev) {
134 if (fixed->link_update) {
135 fixed->link_update(fixed->phydev->attached_dev,
137 fixed_mdio_update_regs(fixed);
141 if ((unsigned int)location >= fixed->regs_num)
143 return fixed->regs[location];
146 static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location,
149 /* do nothing for now */
153 static int fixed_mii_reset(struct mii_bus *bus)
155 /*nothing here - no way/need to reset it */
160 static int fixed_config_aneg(struct phy_device *phydev)
162 /* :TODO:03/13/2006 09:45:37 PM::
163 The full autoneg funcionality can be emulated,
164 but no need to have anything here for now
169 /*-----------------------------------------------------------------------------
170 * the manual bind will do the magic - with phy_id_mask == 0
171 * match will never return true...
172 *-----------------------------------------------------------------------------*/
173 static struct phy_driver fixed_mdio_driver = {
175 #ifdef CONFIG_FIXED_MII_1000_FDX
176 .features = PHY_GBIT_FEATURES,
178 .features = PHY_BASIC_FEATURES,
180 .config_aneg = fixed_config_aneg,
181 .read_status = genphy_read_status,
182 .driver = { .owner = THIS_MODULE, },
185 static void fixed_mdio_release(struct device *dev)
187 struct phy_device *phydev = container_of(dev, struct phy_device, dev);
188 struct mii_bus *bus = phydev->bus;
189 struct fixed_info *fixed = bus->priv;
198 /*-----------------------------------------------------------------------------
199 * This func is used to create all the necessary stuff, bind
200 * the fixed phy driver and register all it on the mdio_bus_type.
201 * speed is either 10 or 100 or 1000, duplex is boolean.
202 * number is used to create multiple fixed PHYs, so that several devices can
203 * utilize them simultaneously.
205 * The device on mdio bus will look like [bus_id]:[phy_id],
207 * phy_id = speed+duplex.
208 *-----------------------------------------------------------------------------*/
209 #if defined(CONFIG_FIXED_MII_100_FDX) || defined(CONFIG_FIXED_MII_10_FDX) || defined(CONFIG_FIXED_MII_1000_FDX)
210 struct fixed_info *fixed_mdio_register_device(
211 int bus_id, int speed, int duplex, u8 phy_id)
213 struct mii_bus *new_bus;
214 struct fixed_info *fixed;
215 struct phy_device *phydev;
218 struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
223 new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
228 fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
231 goto err_fixed_alloc;
233 fixed->regs = kzalloc(MII_REGS_NUM * sizeof(int), GFP_KERNEL);
234 if (NULL == fixed->regs)
235 goto err_fixed_regs_alloc;
237 fixed->regs_num = MII_REGS_NUM;
238 fixed->phy_status.speed = speed;
239 fixed->phy_status.duplex = duplex;
240 fixed->phy_status.link = 1;
242 new_bus->name = "Fixed MII Bus";
243 new_bus->read = &fixed_mii_read;
244 new_bus->write = &fixed_mii_write;
245 new_bus->reset = &fixed_mii_reset;
246 /*set up workspace */
247 fixed_mdio_update_regs(fixed);
248 new_bus->priv = fixed;
251 dev_set_drvdata(dev, new_bus);
253 /* create phy_device and register it on the mdio bus */
254 phydev = phy_device_create(new_bus, 0, 0);
256 goto err_phy_dev_create;
259 * Put the phydev pointer into the fixed pack so that bus read/write
260 * code could be able to access for instance attached netdev. Well it
261 * doesn't have to do so, only in case of utilizing user-specified
265 fixed->phydev = phydev;
266 phydev->speed = speed;
267 phydev->duplex = duplex;
269 phydev->irq = PHY_IGNORE_INTERRUPT;
270 phydev->dev.bus = &mdio_bus_type;
272 snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
273 PHY_ID_FMT, bus_id, phy_id);
275 phydev->bus = new_bus;
277 phydev->dev.driver = &fixed_mdio_driver.driver;
278 phydev->dev.release = fixed_mdio_release;
279 err = phydev->dev.driver->probe(&phydev->dev);
281 printk(KERN_ERR "Phy %s: problems with fixed driver\n",
285 err = device_register(&phydev->dev);
287 printk(KERN_ERR "Phy %s failed to register\n",
291 //phydev->state = PHY_RUNNING; /* make phy go up quick, but in 10Mbit/HDX
298 err_fixed_regs_alloc:
311 MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
312 MODULE_AUTHOR("Vitaly Bordug");
313 MODULE_LICENSE("GPL");
315 static int __init fixed_init(void)
319 /* register on the bus... Not expected to be matched
320 * with anything there...
323 phy_driver_register(&fixed_mdio_driver);
325 /* We will create several mdio devices here, and will bound the upper
328 * Then the external software can lookup the phy bus by searching
329 * for 0:101, to be connected to the virtual 100M Fdx phy.
331 * In case several virtual PHYs required, the bus_id will be in form
332 * [num]:[duplex]+[speed], which make it able even to define
333 * driver-specific link control callback, if for instance PHY is
334 * completely SW-driven.
336 for (i=1; i <= CONFIG_FIXED_MII_AMNT; i++) {
337 #ifdef CONFIG_FIXED_MII_1000_FDX
338 fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(0, 1000, 1, i);
340 #ifdef CONFIG_FIXED_MII_100_FDX
341 fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(1, 100, 1, i);
343 #ifdef CONFIG_FIXED_MII_10_FDX
344 fixed_phy_ptrs[cnt++] = fixed_mdio_register_device(2, 10, 1, i);
351 static void __exit fixed_exit(void)
355 phy_driver_unregister(&fixed_mdio_driver);
356 for (i=0; i < MAX_PHY_AMNT; i++)
357 if ( fixed_phy_ptrs[i] )
358 device_unregister(&fixed_phy_ptrs[i]->phydev->dev);
361 module_init(fixed_init);
362 module_exit(fixed_exit);