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 int irqs[PHY_MAX_ADDR];
31 struct mii_bus *mii_bus;
32 struct list_head phys;
37 u16 regs[MII_REGS_NUM];
38 struct phy_device *phydev;
39 struct fixed_phy_status status;
40 int (*link_update)(struct net_device *, struct fixed_phy_status *);
41 struct list_head node;
45 static struct platform_device *pdev;
46 static struct fixed_mdio_bus platform_fmb = {
47 .phys = LIST_HEAD_INIT(platform_fmb.phys),
50 static int fixed_phy_update_regs(struct fixed_phy *fp)
52 u16 bmsr = BMSR_ANEGCAPABLE;
57 if (gpio_is_valid(fp->link_gpio))
58 fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
60 if (fp->status.duplex) {
61 switch (fp->status.speed) {
75 switch (fp->status.speed) {
90 if (fp->status.link) {
91 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
93 if (fp->status.duplex) {
94 bmcr |= BMCR_FULLDPLX;
96 switch (fp->status.speed) {
98 bmcr |= BMCR_SPEED1000;
99 lpagb |= LPA_1000FULL;
102 bmcr |= BMCR_SPEED100;
109 pr_warn("fixed phy: unknown speed\n");
113 switch (fp->status.speed) {
115 bmcr |= BMCR_SPEED1000;
116 lpagb |= LPA_1000HALF;
119 bmcr |= BMCR_SPEED100;
126 pr_warn("fixed phy: unknown speed\n");
131 if (fp->status.pause)
132 lpa |= LPA_PAUSE_CAP;
134 if (fp->status.asym_pause)
135 lpa |= LPA_PAUSE_ASYM;
138 fp->regs[MII_PHYSID1] = 0;
139 fp->regs[MII_PHYSID2] = 0;
141 fp->regs[MII_BMSR] = bmsr;
142 fp->regs[MII_BMCR] = bmcr;
143 fp->regs[MII_LPA] = lpa;
144 fp->regs[MII_STAT1000] = lpagb;
149 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
151 struct fixed_mdio_bus *fmb = bus->priv;
152 struct fixed_phy *fp;
154 if (reg_num >= MII_REGS_NUM)
157 /* We do not support emulating Clause 45 over Clause 22 register reads
158 * return an error instead of bogus data.
168 list_for_each_entry(fp, &fmb->phys, node) {
169 if (fp->addr == phy_addr) {
170 /* Issue callback if user registered it. */
171 if (fp->link_update) {
172 fp->link_update(fp->phydev->attached_dev,
174 fixed_phy_update_regs(fp);
176 return fp->regs[reg_num];
183 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
190 * If something weird is required to be done with link/speed,
191 * network driver is able to assign a function to implement this.
192 * May be useful for PHY's that need to be software-driven.
194 int fixed_phy_set_link_update(struct phy_device *phydev,
195 int (*link_update)(struct net_device *,
196 struct fixed_phy_status *))
198 struct fixed_mdio_bus *fmb = &platform_fmb;
199 struct fixed_phy *fp;
201 if (!phydev || !phydev->bus)
204 list_for_each_entry(fp, &fmb->phys, node) {
205 if (fp->addr == phydev->addr) {
206 fp->link_update = link_update;
214 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
216 int fixed_phy_update_state(struct phy_device *phydev,
217 const struct fixed_phy_status *status,
218 const struct fixed_phy_status *changed)
220 struct fixed_mdio_bus *fmb = &platform_fmb;
221 struct fixed_phy *fp;
223 if (!phydev || !phydev->bus)
226 list_for_each_entry(fp, &fmb->phys, node) {
227 if (fp->addr == phydev->addr) {
228 #define _UPD(x) if (changed->x) \
229 fp->status.x = status->x
236 fixed_phy_update_regs(fp);
243 EXPORT_SYMBOL(fixed_phy_update_state);
245 int fixed_phy_add(unsigned int irq, int phy_addr,
246 struct fixed_phy_status *status,
250 struct fixed_mdio_bus *fmb = &platform_fmb;
251 struct fixed_phy *fp;
253 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
257 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
259 fmb->irqs[phy_addr] = irq;
262 fp->status = *status;
263 fp->link_gpio = link_gpio;
265 if (gpio_is_valid(fp->link_gpio)) {
266 ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
267 "fixed-link-gpio-link");
272 ret = fixed_phy_update_regs(fp);
276 list_add_tail(&fp->node, &fmb->phys);
281 if (gpio_is_valid(fp->link_gpio))
282 gpio_free(fp->link_gpio);
287 EXPORT_SYMBOL_GPL(fixed_phy_add);
289 void fixed_phy_del(int phy_addr)
291 struct fixed_mdio_bus *fmb = &platform_fmb;
292 struct fixed_phy *fp, *tmp;
294 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
295 if (fp->addr == phy_addr) {
297 if (gpio_is_valid(fp->link_gpio))
298 gpio_free(fp->link_gpio);
304 EXPORT_SYMBOL_GPL(fixed_phy_del);
306 static int phy_fixed_addr;
307 static DEFINE_SPINLOCK(phy_fixed_addr_lock);
309 struct phy_device *fixed_phy_register(unsigned int irq,
310 struct fixed_phy_status *status,
312 struct device_node *np)
314 struct fixed_mdio_bus *fmb = &platform_fmb;
315 struct phy_device *phy;
319 /* Get the next available PHY address, up to PHY_MAX_ADDR */
320 spin_lock(&phy_fixed_addr_lock);
321 if (phy_fixed_addr == PHY_MAX_ADDR) {
322 spin_unlock(&phy_fixed_addr_lock);
323 return ERR_PTR(-ENOSPC);
325 phy_addr = phy_fixed_addr++;
326 spin_unlock(&phy_fixed_addr_lock);
328 ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
332 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
333 if (!phy || IS_ERR(phy)) {
334 fixed_phy_del(phy_addr);
335 return ERR_PTR(-EINVAL);
338 /* propagate the fixed link values to struct phy_device */
339 phy->link = status->link;
341 phy->speed = status->speed;
342 phy->duplex = status->duplex;
343 phy->pause = status->pause;
344 phy->asym_pause = status->asym_pause;
348 phy->dev.of_node = np;
349 phy->is_pseudo_fixed_link = true;
351 switch (status->speed) {
353 phy->supported = PHY_1000BT_FEATURES;
356 phy->supported = PHY_100BT_FEATURES;
360 phy->supported = PHY_10BT_FEATURES;
363 ret = phy_device_register(phy);
365 phy_device_free(phy);
367 fixed_phy_del(phy_addr);
373 EXPORT_SYMBOL_GPL(fixed_phy_register);
375 static int __init fixed_mdio_bus_init(void)
377 struct fixed_mdio_bus *fmb = &platform_fmb;
380 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
386 fmb->mii_bus = mdiobus_alloc();
387 if (fmb->mii_bus == NULL) {
389 goto err_mdiobus_reg;
392 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
393 fmb->mii_bus->name = "Fixed MDIO Bus";
394 fmb->mii_bus->priv = fmb;
395 fmb->mii_bus->parent = &pdev->dev;
396 fmb->mii_bus->read = &fixed_mdio_read;
397 fmb->mii_bus->write = &fixed_mdio_write;
398 fmb->mii_bus->irq = fmb->irqs;
400 ret = mdiobus_register(fmb->mii_bus);
402 goto err_mdiobus_alloc;
407 mdiobus_free(fmb->mii_bus);
409 platform_device_unregister(pdev);
413 module_init(fixed_mdio_bus_init);
415 static void __exit fixed_mdio_bus_exit(void)
417 struct fixed_mdio_bus *fmb = &platform_fmb;
418 struct fixed_phy *fp, *tmp;
420 mdiobus_unregister(fmb->mii_bus);
421 mdiobus_free(fmb->mii_bus);
422 platform_device_unregister(pdev);
424 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
429 module_exit(fixed_mdio_bus_exit);
431 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
432 MODULE_AUTHOR("Vitaly Bordug");
433 MODULE_LICENSE("GPL");