2 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
4 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
5 * Anton Vorontsov <avorontsov@ru.mvista.com>
7 * Copyright (c) 2006-2007 MontaVista Software, Inc.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/list.h>
19 #include <linux/mii.h>
20 #include <linux/phy.h>
21 #include <linux/phy_fixed.h>
23 #define MII_REGS_NUM 29
25 struct fixed_mdio_bus {
26 int irqs[PHY_MAX_ADDR];
27 struct mii_bus *mii_bus;
28 struct list_head phys;
33 u16 regs[MII_REGS_NUM];
34 struct phy_device *phydev;
35 struct fixed_phy_status status;
36 int (*link_update)(struct net_device *, struct fixed_phy_status *);
37 struct list_head node;
40 static struct platform_device *pdev;
41 static struct fixed_mdio_bus platform_fmb = {
42 .phys = LIST_HEAD_INIT(platform_fmb.phys),
45 static int fixed_phy_update_regs(struct fixed_phy *fp)
47 u16 bmsr = BMSR_ANEGCAPABLE;
52 if (fp->status.duplex) {
53 bmcr |= BMCR_FULLDPLX;
55 switch (fp->status.speed) {
58 bmcr |= BMCR_SPEED1000;
59 lpagb |= LPA_1000FULL;
63 bmcr |= BMCR_SPEED100;
71 printk(KERN_WARNING "fixed phy: unknown speed\n");
75 switch (fp->status.speed) {
78 bmcr |= BMCR_SPEED1000;
79 lpagb |= LPA_1000HALF;
83 bmcr |= BMCR_SPEED100;
91 printk(KERN_WARNING "fixed phy: unknown speed\n");
97 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
100 lpa |= LPA_PAUSE_CAP;
102 if (fp->status.asym_pause)
103 lpa |= LPA_PAUSE_ASYM;
105 fp->regs[MII_PHYSID1] = fp->id >> 16;
106 fp->regs[MII_PHYSID2] = fp->id;
108 fp->regs[MII_BMSR] = bmsr;
109 fp->regs[MII_BMCR] = bmcr;
110 fp->regs[MII_LPA] = lpa;
111 fp->regs[MII_STAT1000] = lpagb;
116 static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num)
118 struct fixed_mdio_bus *fmb = bus->priv;
119 struct fixed_phy *fp;
121 if (reg_num >= MII_REGS_NUM)
124 list_for_each_entry(fp, &fmb->phys, node) {
125 if (fp->id == phy_id) {
126 /* Issue callback if user registered it. */
127 if (fp->link_update) {
128 fp->link_update(fp->phydev->attached_dev,
130 fixed_phy_update_regs(fp);
132 return fp->regs[reg_num];
139 static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num,
146 * If something weird is required to be done with link/speed,
147 * network driver is able to assign a function to implement this.
148 * May be useful for PHY's that need to be software-driven.
150 int fixed_phy_set_link_update(struct phy_device *phydev,
151 int (*link_update)(struct net_device *,
152 struct fixed_phy_status *))
154 struct fixed_mdio_bus *fmb = &platform_fmb;
155 struct fixed_phy *fp;
157 if (!link_update || !phydev || !phydev->bus)
160 list_for_each_entry(fp, &fmb->phys, node) {
161 if (fp->id == phydev->phy_id) {
162 fp->link_update = link_update;
170 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
172 int fixed_phy_add(unsigned int irq, int phy_id,
173 struct fixed_phy_status *status)
176 struct fixed_mdio_bus *fmb = &platform_fmb;
177 struct fixed_phy *fp;
179 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
183 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
185 fmb->irqs[phy_id] = irq;
188 fp->status = *status;
190 ret = fixed_phy_update_regs(fp);
194 list_add_tail(&fp->node, &fmb->phys);
202 EXPORT_SYMBOL_GPL(fixed_phy_add);
204 static int __init fixed_mdio_bus_init(void)
206 struct fixed_mdio_bus *fmb = &platform_fmb;
209 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
215 fmb->mii_bus = mdiobus_alloc();
216 if (fmb->mii_bus == NULL) {
218 goto err_mdiobus_reg;
221 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "0");
222 fmb->mii_bus->name = "Fixed MDIO Bus";
223 fmb->mii_bus->priv = fmb;
224 fmb->mii_bus->parent = &pdev->dev;
225 fmb->mii_bus->read = &fixed_mdio_read;
226 fmb->mii_bus->write = &fixed_mdio_write;
227 fmb->mii_bus->irq = fmb->irqs;
229 ret = mdiobus_register(fmb->mii_bus);
231 goto err_mdiobus_alloc;
236 mdiobus_free(fmb->mii_bus);
238 platform_device_unregister(pdev);
242 module_init(fixed_mdio_bus_init);
244 static void __exit fixed_mdio_bus_exit(void)
246 struct fixed_mdio_bus *fmb = &platform_fmb;
247 struct fixed_phy *fp, *tmp;
249 mdiobus_unregister(fmb->mii_bus);
250 mdiobus_free(fmb->mii_bus);
251 platform_device_unregister(pdev);
253 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
258 module_exit(fixed_mdio_bus_exit);
260 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
261 MODULE_AUTHOR("Vitaly Bordug");
262 MODULE_LICENSE("GPL");