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>
25 #include <linux/gpio.h>
27 #define MII_REGS_NUM 29
29 struct fixed_mdio_bus {
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;
44 static struct platform_device *pdev;
45 static struct fixed_mdio_bus platform_fmb = {
46 .phys = LIST_HEAD_INIT(platform_fmb.phys),
49 static int fixed_phy_update_regs(struct fixed_phy *fp)
51 u16 bmsr = BMSR_ANEGCAPABLE;
56 if (gpio_is_valid(fp->link_gpio))
57 fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
59 if (fp->status.duplex) {
60 switch (fp->status.speed) {
74 switch (fp->status.speed) {
89 if (fp->status.link) {
90 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
92 if (fp->status.duplex) {
93 bmcr |= BMCR_FULLDPLX;
95 switch (fp->status.speed) {
97 bmcr |= BMCR_SPEED1000;
98 lpagb |= LPA_1000FULL;
101 bmcr |= BMCR_SPEED100;
108 pr_warn("fixed phy: unknown speed\n");
112 switch (fp->status.speed) {
114 bmcr |= BMCR_SPEED1000;
115 lpagb |= LPA_1000HALF;
118 bmcr |= BMCR_SPEED100;
125 pr_warn("fixed phy: unknown speed\n");
130 if (fp->status.pause)
131 lpa |= LPA_PAUSE_CAP;
133 if (fp->status.asym_pause)
134 lpa |= LPA_PAUSE_ASYM;
137 fp->regs[MII_PHYSID1] = 0;
138 fp->regs[MII_PHYSID2] = 0;
140 fp->regs[MII_BMSR] = bmsr;
141 fp->regs[MII_BMCR] = bmcr;
142 fp->regs[MII_LPA] = lpa;
143 fp->regs[MII_STAT1000] = lpagb;
148 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
150 struct fixed_mdio_bus *fmb = bus->priv;
151 struct fixed_phy *fp;
153 if (reg_num >= MII_REGS_NUM)
156 /* We do not support emulating Clause 45 over Clause 22 register reads
157 * return an error instead of bogus data.
167 list_for_each_entry(fp, &fmb->phys, node) {
168 if (fp->addr == phy_addr) {
169 /* Issue callback if user registered it. */
170 if (fp->link_update) {
171 fp->link_update(fp->phydev->attached_dev,
173 fixed_phy_update_regs(fp);
175 return fp->regs[reg_num];
182 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
189 * If something weird is required to be done with link/speed,
190 * network driver is able to assign a function to implement this.
191 * May be useful for PHY's that need to be software-driven.
193 int fixed_phy_set_link_update(struct phy_device *phydev,
194 int (*link_update)(struct net_device *,
195 struct fixed_phy_status *))
197 struct fixed_mdio_bus *fmb = &platform_fmb;
198 struct fixed_phy *fp;
200 if (!phydev || !phydev->mdio.bus)
203 list_for_each_entry(fp, &fmb->phys, node) {
204 if (fp->addr == phydev->mdio.addr) {
205 fp->link_update = link_update;
213 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
215 int fixed_phy_update_state(struct phy_device *phydev,
216 const struct fixed_phy_status *status,
217 const struct fixed_phy_status *changed)
219 struct fixed_mdio_bus *fmb = &platform_fmb;
220 struct fixed_phy *fp;
222 if (!phydev || phydev->mdio.bus != fmb->mii_bus)
225 list_for_each_entry(fp, &fmb->phys, node) {
226 if (fp->addr == phydev->mdio.addr) {
227 #define _UPD(x) if (changed->x) \
228 fp->status.x = status->x
235 fixed_phy_update_regs(fp);
242 EXPORT_SYMBOL(fixed_phy_update_state);
244 int fixed_phy_add(unsigned int irq, int phy_addr,
245 struct fixed_phy_status *status,
249 struct fixed_mdio_bus *fmb = &platform_fmb;
250 struct fixed_phy *fp;
252 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
256 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
258 fmb->mii_bus->irq[phy_addr] = irq;
261 fp->status = *status;
262 fp->link_gpio = link_gpio;
264 if (gpio_is_valid(fp->link_gpio)) {
265 ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
266 "fixed-link-gpio-link");
271 ret = fixed_phy_update_regs(fp);
275 list_add_tail(&fp->node, &fmb->phys);
280 if (gpio_is_valid(fp->link_gpio))
281 gpio_free(fp->link_gpio);
286 EXPORT_SYMBOL_GPL(fixed_phy_add);
288 static void fixed_phy_del(int phy_addr)
290 struct fixed_mdio_bus *fmb = &platform_fmb;
291 struct fixed_phy *fp, *tmp;
293 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
294 if (fp->addr == phy_addr) {
296 if (gpio_is_valid(fp->link_gpio))
297 gpio_free(fp->link_gpio);
304 static int phy_fixed_addr;
305 static DEFINE_SPINLOCK(phy_fixed_addr_lock);
307 struct phy_device *fixed_phy_register(unsigned int irq,
308 struct fixed_phy_status *status,
310 struct device_node *np)
312 struct fixed_mdio_bus *fmb = &platform_fmb;
313 struct phy_device *phy;
317 /* Get the next available PHY address, up to PHY_MAX_ADDR */
318 spin_lock(&phy_fixed_addr_lock);
319 if (phy_fixed_addr == PHY_MAX_ADDR) {
320 spin_unlock(&phy_fixed_addr_lock);
321 return ERR_PTR(-ENOSPC);
323 phy_addr = phy_fixed_addr++;
324 spin_unlock(&phy_fixed_addr_lock);
326 ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
330 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
331 if (!phy || IS_ERR(phy)) {
332 fixed_phy_del(phy_addr);
333 return ERR_PTR(-EINVAL);
336 /* propagate the fixed link values to struct phy_device */
337 phy->link = status->link;
339 phy->speed = status->speed;
340 phy->duplex = status->duplex;
341 phy->pause = status->pause;
342 phy->asym_pause = status->asym_pause;
346 phy->mdio.dev.of_node = np;
347 phy->is_pseudo_fixed_link = true;
349 switch (status->speed) {
351 phy->supported = PHY_1000BT_FEATURES;
354 phy->supported = PHY_100BT_FEATURES;
358 phy->supported = PHY_10BT_FEATURES;
361 ret = phy_device_register(phy);
363 phy_device_free(phy);
365 fixed_phy_del(phy_addr);
371 EXPORT_SYMBOL_GPL(fixed_phy_register);
373 void fixed_phy_unregister(struct phy_device *phy)
375 phy_device_remove(phy);
377 fixed_phy_del(phy->mdio.addr);
379 EXPORT_SYMBOL_GPL(fixed_phy_unregister);
381 static int __init fixed_mdio_bus_init(void)
383 struct fixed_mdio_bus *fmb = &platform_fmb;
386 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
392 fmb->mii_bus = mdiobus_alloc();
393 if (fmb->mii_bus == NULL) {
395 goto err_mdiobus_reg;
398 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
399 fmb->mii_bus->name = "Fixed MDIO Bus";
400 fmb->mii_bus->priv = fmb;
401 fmb->mii_bus->parent = &pdev->dev;
402 fmb->mii_bus->read = &fixed_mdio_read;
403 fmb->mii_bus->write = &fixed_mdio_write;
405 ret = mdiobus_register(fmb->mii_bus);
407 goto err_mdiobus_alloc;
412 mdiobus_free(fmb->mii_bus);
414 platform_device_unregister(pdev);
418 module_init(fixed_mdio_bus_init);
420 static void __exit fixed_mdio_bus_exit(void)
422 struct fixed_mdio_bus *fmb = &platform_fmb;
423 struct fixed_phy *fp, *tmp;
425 mdiobus_unregister(fmb->mii_bus);
426 mdiobus_free(fmb->mii_bus);
427 platform_device_unregister(pdev);
429 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
434 module_exit(fixed_mdio_bus_exit);
436 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
437 MODULE_AUTHOR("Vitaly Bordug");
438 MODULE_LICENSE("GPL");