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>
23 #include <linux/slab.h>
26 #define MII_REGS_NUM 29
28 struct fixed_mdio_bus {
29 int irqs[PHY_MAX_ADDR];
30 struct mii_bus *mii_bus;
31 struct list_head phys;
36 u16 regs[MII_REGS_NUM];
37 struct phy_device *phydev;
38 struct fixed_phy_status status;
39 int (*link_update)(struct net_device *, struct fixed_phy_status *);
40 struct list_head node;
43 static struct platform_device *pdev;
44 static struct fixed_mdio_bus platform_fmb = {
45 .phys = LIST_HEAD_INIT(platform_fmb.phys),
48 static int fixed_phy_update_regs(struct fixed_phy *fp)
50 u16 bmsr = BMSR_ANEGCAPABLE;
55 if (fp->status.duplex) {
56 bmcr |= BMCR_FULLDPLX;
58 switch (fp->status.speed) {
61 bmcr |= BMCR_SPEED1000;
62 lpagb |= LPA_1000FULL;
66 bmcr |= BMCR_SPEED100;
74 pr_warn("fixed phy: unknown speed\n");
78 switch (fp->status.speed) {
81 bmcr |= BMCR_SPEED1000;
82 lpagb |= LPA_1000HALF;
86 bmcr |= BMCR_SPEED100;
94 pr_warn("fixed phy: unknown speed\n");
100 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
102 if (fp->status.pause)
103 lpa |= LPA_PAUSE_CAP;
105 if (fp->status.asym_pause)
106 lpa |= LPA_PAUSE_ASYM;
108 fp->regs[MII_PHYSID1] = 0;
109 fp->regs[MII_PHYSID2] = 0;
111 fp->regs[MII_BMSR] = bmsr;
112 fp->regs[MII_BMCR] = bmcr;
113 fp->regs[MII_LPA] = lpa;
114 fp->regs[MII_STAT1000] = lpagb;
119 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
121 struct fixed_mdio_bus *fmb = bus->priv;
122 struct fixed_phy *fp;
124 if (reg_num >= MII_REGS_NUM)
127 /* We do not support emulating Clause 45 over Clause 22 register reads
128 * return an error instead of bogus data.
138 list_for_each_entry(fp, &fmb->phys, node) {
139 if (fp->addr == phy_addr) {
140 /* Issue callback if user registered it. */
141 if (fp->link_update) {
142 fp->link_update(fp->phydev->attached_dev,
144 fixed_phy_update_regs(fp);
146 return fp->regs[reg_num];
153 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
160 * If something weird is required to be done with link/speed,
161 * network driver is able to assign a function to implement this.
162 * May be useful for PHY's that need to be software-driven.
164 int fixed_phy_set_link_update(struct phy_device *phydev,
165 int (*link_update)(struct net_device *,
166 struct fixed_phy_status *))
168 struct fixed_mdio_bus *fmb = &platform_fmb;
169 struct fixed_phy *fp;
171 if (!phydev || !phydev->bus)
174 list_for_each_entry(fp, &fmb->phys, node) {
175 if (fp->addr == phydev->addr) {
176 fp->link_update = link_update;
184 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
186 int fixed_phy_update_state(struct phy_device *phydev,
187 const struct fixed_phy_status *status,
188 const struct fixed_phy_status *changed)
190 struct fixed_mdio_bus *fmb = &platform_fmb;
191 struct fixed_phy *fp;
193 if (!phydev || !phydev->bus)
196 list_for_each_entry(fp, &fmb->phys, node) {
197 if (fp->addr == phydev->addr) {
198 #define _UPD(x) if (changed->x) \
199 fp->status.x = status->x
206 fixed_phy_update_regs(fp);
213 EXPORT_SYMBOL(fixed_phy_update_state);
215 int fixed_phy_add(unsigned int irq, int phy_addr,
216 struct fixed_phy_status *status)
219 struct fixed_mdio_bus *fmb = &platform_fmb;
220 struct fixed_phy *fp;
222 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
226 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
228 fmb->irqs[phy_addr] = irq;
231 fp->status = *status;
233 ret = fixed_phy_update_regs(fp);
237 list_add_tail(&fp->node, &fmb->phys);
245 EXPORT_SYMBOL_GPL(fixed_phy_add);
247 void fixed_phy_del(int phy_addr)
249 struct fixed_mdio_bus *fmb = &platform_fmb;
250 struct fixed_phy *fp, *tmp;
252 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
253 if (fp->addr == phy_addr) {
260 EXPORT_SYMBOL_GPL(fixed_phy_del);
262 static int phy_fixed_addr;
263 static DEFINE_SPINLOCK(phy_fixed_addr_lock);
265 struct phy_device *fixed_phy_register(unsigned int irq,
266 struct fixed_phy_status *status,
267 struct device_node *np)
269 struct fixed_mdio_bus *fmb = &platform_fmb;
270 struct phy_device *phy;
274 /* Get the next available PHY address, up to PHY_MAX_ADDR */
275 spin_lock(&phy_fixed_addr_lock);
276 if (phy_fixed_addr == PHY_MAX_ADDR) {
277 spin_unlock(&phy_fixed_addr_lock);
278 return ERR_PTR(-ENOSPC);
280 phy_addr = phy_fixed_addr++;
281 spin_unlock(&phy_fixed_addr_lock);
283 ret = fixed_phy_add(PHY_POLL, phy_addr, status);
287 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
288 if (!phy || IS_ERR(phy)) {
289 fixed_phy_del(phy_addr);
290 return ERR_PTR(-EINVAL);
294 phy->dev.of_node = np;
296 ret = phy_device_register(phy);
298 phy_device_free(phy);
300 fixed_phy_del(phy_addr);
306 EXPORT_SYMBOL_GPL(fixed_phy_register);
308 static int __init fixed_mdio_bus_init(void)
310 struct fixed_mdio_bus *fmb = &platform_fmb;
313 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
319 fmb->mii_bus = mdiobus_alloc();
320 if (fmb->mii_bus == NULL) {
322 goto err_mdiobus_reg;
325 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
326 fmb->mii_bus->name = "Fixed MDIO Bus";
327 fmb->mii_bus->priv = fmb;
328 fmb->mii_bus->parent = &pdev->dev;
329 fmb->mii_bus->read = &fixed_mdio_read;
330 fmb->mii_bus->write = &fixed_mdio_write;
331 fmb->mii_bus->irq = fmb->irqs;
333 ret = mdiobus_register(fmb->mii_bus);
335 goto err_mdiobus_alloc;
340 mdiobus_free(fmb->mii_bus);
342 platform_device_unregister(pdev);
346 module_init(fixed_mdio_bus_init);
348 static void __exit fixed_mdio_bus_exit(void)
350 struct fixed_mdio_bus *fmb = &platform_fmb;
351 struct fixed_phy *fp, *tmp;
353 mdiobus_unregister(fmb->mii_bus);
354 mdiobus_free(fmb->mii_bus);
355 platform_device_unregister(pdev);
357 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
362 module_exit(fixed_mdio_bus_exit);
364 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
365 MODULE_AUTHOR("Vitaly Bordug");
366 MODULE_LICENSE("GPL");