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>
22 #include <linux/err.h>
24 #define MII_REGS_NUM 29
26 struct fixed_mdio_bus {
27 int irqs[PHY_MAX_ADDR];
28 struct mii_bus *mii_bus;
29 struct list_head phys;
34 u16 regs[MII_REGS_NUM];
35 struct phy_device *phydev;
36 struct fixed_phy_status status;
37 int (*link_update)(struct net_device *, struct fixed_phy_status *);
38 struct list_head node;
41 static struct platform_device *pdev;
42 static struct fixed_mdio_bus platform_fmb = {
43 .phys = LIST_HEAD_INIT(platform_fmb.phys),
46 static int fixed_phy_update_regs(struct fixed_phy *fp)
48 u16 bmsr = BMSR_ANEGCAPABLE;
53 if (fp->status.duplex) {
54 bmcr |= BMCR_FULLDPLX;
56 switch (fp->status.speed) {
59 bmcr |= BMCR_SPEED1000;
60 lpagb |= LPA_1000FULL;
64 bmcr |= BMCR_SPEED100;
72 printk(KERN_WARNING "fixed phy: unknown speed\n");
76 switch (fp->status.speed) {
79 bmcr |= BMCR_SPEED1000;
80 lpagb |= LPA_1000HALF;
84 bmcr |= BMCR_SPEED100;
92 printk(KERN_WARNING "fixed phy: unknown speed\n");
98 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
100 if (fp->status.pause)
101 lpa |= LPA_PAUSE_CAP;
103 if (fp->status.asym_pause)
104 lpa |= LPA_PAUSE_ASYM;
106 fp->regs[MII_PHYSID1] = fp->id >> 16;
107 fp->regs[MII_PHYSID2] = fp->id;
109 fp->regs[MII_BMSR] = bmsr;
110 fp->regs[MII_BMCR] = bmcr;
111 fp->regs[MII_LPA] = lpa;
112 fp->regs[MII_STAT1000] = lpagb;
117 static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num)
119 struct fixed_mdio_bus *fmb = bus->priv;
120 struct fixed_phy *fp;
122 if (reg_num >= MII_REGS_NUM)
125 list_for_each_entry(fp, &fmb->phys, node) {
126 if (fp->id == phy_id) {
127 /* Issue callback if user registered it. */
128 if (fp->link_update) {
129 fp->link_update(fp->phydev->attached_dev,
131 fixed_phy_update_regs(fp);
133 return fp->regs[reg_num];
140 static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num,
147 * If something weird is required to be done with link/speed,
148 * network driver is able to assign a function to implement this.
149 * May be useful for PHY's that need to be software-driven.
151 int fixed_phy_set_link_update(struct phy_device *phydev,
152 int (*link_update)(struct net_device *,
153 struct fixed_phy_status *))
155 struct fixed_mdio_bus *fmb = &platform_fmb;
156 struct fixed_phy *fp;
158 if (!link_update || !phydev || !phydev->bus)
161 list_for_each_entry(fp, &fmb->phys, node) {
162 if (fp->id == phydev->phy_id) {
163 fp->link_update = link_update;
171 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
173 int fixed_phy_add(unsigned int irq, int phy_id,
174 struct fixed_phy_status *status)
177 struct fixed_mdio_bus *fmb = &platform_fmb;
178 struct fixed_phy *fp;
180 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
184 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
186 fmb->irqs[phy_id] = irq;
189 fp->status = *status;
191 ret = fixed_phy_update_regs(fp);
195 list_add_tail(&fp->node, &fmb->phys);
203 EXPORT_SYMBOL_GPL(fixed_phy_add);
205 static int __init fixed_mdio_bus_init(void)
207 struct fixed_mdio_bus *fmb = &platform_fmb;
210 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
216 fmb->mii_bus = mdiobus_alloc();
217 if (fmb->mii_bus == NULL) {
219 goto err_mdiobus_reg;
222 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "0");
223 fmb->mii_bus->name = "Fixed MDIO Bus";
224 fmb->mii_bus->priv = fmb;
225 fmb->mii_bus->parent = &pdev->dev;
226 fmb->mii_bus->read = &fixed_mdio_read;
227 fmb->mii_bus->write = &fixed_mdio_write;
228 fmb->mii_bus->irq = fmb->irqs;
230 ret = mdiobus_register(fmb->mii_bus);
232 goto err_mdiobus_alloc;
237 mdiobus_free(fmb->mii_bus);
239 platform_device_unregister(pdev);
243 module_init(fixed_mdio_bus_init);
245 static void __exit fixed_mdio_bus_exit(void)
247 struct fixed_mdio_bus *fmb = &platform_fmb;
248 struct fixed_phy *fp, *tmp;
250 mdiobus_unregister(fmb->mii_bus);
251 mdiobus_free(fmb->mii_bus);
252 platform_device_unregister(pdev);
254 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
259 module_exit(fixed_mdio_bus_exit);
261 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
262 MODULE_AUTHOR("Vitaly Bordug");
263 MODULE_LICENSE("GPL");