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Vitaly Bordug11b0bac2006-08-14 23:00:29 -07001/*
Vitaly Borduga79d8e92007-12-07 01:51:22 +03002 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
Vitaly Bordug11b0bac2006-08-14 23:00:29 -07003 *
Vitaly Borduga79d8e92007-12-07 01:51:22 +03004 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
5 * Anton Vorontsov <avorontsov@ru.mvista.com>
Vitaly Bordug11b0bac2006-08-14 23:00:29 -07006 *
Vitaly Borduga79d8e92007-12-07 01:51:22 +03007 * Copyright (c) 2006-2007 MontaVista Software, Inc.
Vitaly Bordug11b0bac2006-08-14 23:00:29 -07008 *
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.
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070013 */
Vitaly Borduga79d8e92007-12-07 01:51:22 +030014
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070015#include <linux/kernel.h>
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070016#include <linux/module.h>
Vitaly Borduga79d8e92007-12-07 01:51:22 +030017#include <linux/platform_device.h>
18#include <linux/list.h>
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070019#include <linux/mii.h>
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070020#include <linux/phy.h>
Vitaly Bordug7c32f472007-08-10 14:05:16 -070021#include <linux/phy_fixed.h>
Dan Carpenter57401d52009-04-11 01:52:29 -070022#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Thomas Petazzonia7595122014-05-16 16:14:04 +020024#include <linux/of.h>
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070025
Vitaly Borduga79d8e92007-12-07 01:51:22 +030026#define MII_REGS_NUM 29
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070027
Vitaly Borduga79d8e92007-12-07 01:51:22 +030028struct fixed_mdio_bus {
29 int irqs[PHY_MAX_ADDR];
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -070030 struct mii_bus *mii_bus;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030031 struct list_head phys;
32};
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070033
Vitaly Borduga79d8e92007-12-07 01:51:22 +030034struct fixed_phy {
Thomas Petazzoni9b744942014-05-16 16:14:03 +020035 int addr;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030036 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;
41};
42
43static struct platform_device *pdev;
44static struct fixed_mdio_bus platform_fmb = {
45 .phys = LIST_HEAD_INIT(platform_fmb.phys),
46};
47
48static int fixed_phy_update_regs(struct fixed_phy *fp)
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070049{
Vitaly Borduga79d8e92007-12-07 01:51:22 +030050 u16 bmsr = BMSR_ANEGCAPABLE;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070051 u16 bmcr = 0;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030052 u16 lpagb = 0;
53 u16 lpa = 0;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070054
Vitaly Borduga79d8e92007-12-07 01:51:22 +030055 if (fp->status.duplex) {
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070056 bmcr |= BMCR_FULLDPLX;
57
Vitaly Borduga79d8e92007-12-07 01:51:22 +030058 switch (fp->status.speed) {
59 case 1000:
60 bmsr |= BMSR_ESTATEN;
61 bmcr |= BMCR_SPEED1000;
62 lpagb |= LPA_1000FULL;
63 break;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070064 case 100:
65 bmsr |= BMSR_100FULL;
66 bmcr |= BMCR_SPEED100;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030067 lpa |= LPA_100FULL;
Vitaly Bordug7c32f472007-08-10 14:05:16 -070068 break;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070069 case 10:
70 bmsr |= BMSR_10FULL;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030071 lpa |= LPA_10FULL;
Vitaly Bordug7c32f472007-08-10 14:05:16 -070072 break;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030073 default:
Joe Perches8d242482012-06-09 07:49:07 +000074 pr_warn("fixed phy: unknown speed\n");
Vitaly Borduga79d8e92007-12-07 01:51:22 +030075 return -EINVAL;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070076 }
77 } else {
Vitaly Borduga79d8e92007-12-07 01:51:22 +030078 switch (fp->status.speed) {
79 case 1000:
80 bmsr |= BMSR_ESTATEN;
81 bmcr |= BMCR_SPEED1000;
82 lpagb |= LPA_1000HALF;
83 break;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070084 case 100:
85 bmsr |= BMSR_100HALF;
86 bmcr |= BMCR_SPEED100;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030087 lpa |= LPA_100HALF;
Vitaly Bordug7c32f472007-08-10 14:05:16 -070088 break;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070089 case 10:
Vitaly Borduga79d8e92007-12-07 01:51:22 +030090 bmsr |= BMSR_10HALF;
91 lpa |= LPA_10HALF;
Vitaly Bordug7c32f472007-08-10 14:05:16 -070092 break;
Vitaly Borduga79d8e92007-12-07 01:51:22 +030093 default:
Joe Perches8d242482012-06-09 07:49:07 +000094 pr_warn("fixed phy: unknown speed\n");
Vitaly Borduga79d8e92007-12-07 01:51:22 +030095 return -EINVAL;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -070096 }
97 }
98
Vitaly Borduga79d8e92007-12-07 01:51:22 +030099 if (fp->status.link)
100 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
101
102 if (fp->status.pause)
103 lpa |= LPA_PAUSE_CAP;
104
105 if (fp->status.asym_pause)
106 lpa |= LPA_PAUSE_ASYM;
107
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200108 fp->regs[MII_PHYSID1] = 0;
109 fp->regs[MII_PHYSID2] = 0;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300110
111 fp->regs[MII_BMSR] = bmsr;
112 fp->regs[MII_BMCR] = bmcr;
113 fp->regs[MII_LPA] = lpa;
114 fp->regs[MII_STAT1000] = lpagb;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700115
116 return 0;
117}
118
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200119static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700120{
Lennert Buytenhekec2a5652008-10-09 09:45:04 -0700121 struct fixed_mdio_bus *fmb = bus->priv;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300122 struct fixed_phy *fp;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700123
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300124 if (reg_num >= MII_REGS_NUM)
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700125 return -1;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700126
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300127 list_for_each_entry(fp, &fmb->phys, node) {
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200128 if (fp->addr == phy_addr) {
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300129 /* Issue callback if user registered it. */
130 if (fp->link_update) {
131 fp->link_update(fp->phydev->attached_dev,
132 &fp->status);
133 fixed_phy_update_regs(fp);
134 }
135 return fp->regs[reg_num];
136 }
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700137 }
138
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300139 return 0xFFFF;
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700140}
141
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200142static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300143 u16 val)
144{
145 return 0;
146}
147
148/*
149 * If something weird is required to be done with link/speed,
150 * network driver is able to assign a function to implement this.
151 * May be useful for PHY's that need to be software-driven.
152 */
153int fixed_phy_set_link_update(struct phy_device *phydev,
154 int (*link_update)(struct net_device *,
155 struct fixed_phy_status *))
156{
157 struct fixed_mdio_bus *fmb = &platform_fmb;
158 struct fixed_phy *fp;
159
160 if (!link_update || !phydev || !phydev->bus)
161 return -EINVAL;
162
163 list_for_each_entry(fp, &fmb->phys, node) {
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200164 if (fp->addr == phydev->addr) {
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300165 fp->link_update = link_update;
166 fp->phydev = phydev;
167 return 0;
168 }
169 }
170
171 return -ENOENT;
172}
173EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
174
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200175int fixed_phy_add(unsigned int irq, int phy_addr,
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300176 struct fixed_phy_status *status)
177{
178 int ret;
179 struct fixed_mdio_bus *fmb = &platform_fmb;
180 struct fixed_phy *fp;
181
182 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
183 if (!fp)
184 return -ENOMEM;
185
186 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
187
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200188 fmb->irqs[phy_addr] = irq;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300189
Thomas Petazzoni9b744942014-05-16 16:14:03 +0200190 fp->addr = phy_addr;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300191 fp->status = *status;
192
193 ret = fixed_phy_update_regs(fp);
194 if (ret)
195 goto err_regs;
196
197 list_add_tail(&fp->node, &fmb->phys);
198
199 return 0;
200
201err_regs:
202 kfree(fp);
203 return ret;
204}
205EXPORT_SYMBOL_GPL(fixed_phy_add);
206
Thomas Petazzonia7595122014-05-16 16:14:04 +0200207void fixed_phy_del(int phy_addr)
208{
209 struct fixed_mdio_bus *fmb = &platform_fmb;
210 struct fixed_phy *fp, *tmp;
211
212 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
213 if (fp->addr == phy_addr) {
214 list_del(&fp->node);
215 kfree(fp);
216 return;
217 }
218 }
219}
220EXPORT_SYMBOL_GPL(fixed_phy_del);
221
222static int phy_fixed_addr;
223static DEFINE_SPINLOCK(phy_fixed_addr_lock);
224
225int fixed_phy_register(unsigned int irq,
226 struct fixed_phy_status *status,
227 struct device_node *np)
228{
229 struct fixed_mdio_bus *fmb = &platform_fmb;
230 struct phy_device *phy;
231 int phy_addr;
232 int ret;
233
234 /* Get the next available PHY address, up to PHY_MAX_ADDR */
235 spin_lock(&phy_fixed_addr_lock);
236 if (phy_fixed_addr == PHY_MAX_ADDR) {
237 spin_unlock(&phy_fixed_addr_lock);
238 return -ENOSPC;
239 }
240 phy_addr = phy_fixed_addr++;
241 spin_unlock(&phy_fixed_addr_lock);
242
243 ret = fixed_phy_add(PHY_POLL, phy_addr, status);
244 if (ret < 0)
245 return ret;
246
247 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
248 if (!phy || IS_ERR(phy)) {
249 fixed_phy_del(phy_addr);
250 return -EINVAL;
251 }
252
253 of_node_get(np);
254 phy->dev.of_node = np;
255
256 ret = phy_device_register(phy);
257 if (ret) {
258 phy_device_free(phy);
259 of_node_put(np);
260 fixed_phy_del(phy_addr);
261 return ret;
262 }
263
264 return 0;
265}
266
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300267static int __init fixed_mdio_bus_init(void)
268{
269 struct fixed_mdio_bus *fmb = &platform_fmb;
270 int ret;
271
272 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
Dan Carpenter57401d52009-04-11 01:52:29 -0700273 if (IS_ERR(pdev)) {
274 ret = PTR_ERR(pdev);
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300275 goto err_pdev;
276 }
277
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700278 fmb->mii_bus = mdiobus_alloc();
279 if (fmb->mii_bus == NULL) {
280 ret = -ENOMEM;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300281 goto err_mdiobus_reg;
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700282 }
283
Florian Fainelli9e6c6432012-01-09 23:59:25 +0000284 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700285 fmb->mii_bus->name = "Fixed MDIO Bus";
Lennert Buytenhekec2a5652008-10-09 09:45:04 -0700286 fmb->mii_bus->priv = fmb;
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700287 fmb->mii_bus->parent = &pdev->dev;
288 fmb->mii_bus->read = &fixed_mdio_read;
289 fmb->mii_bus->write = &fixed_mdio_write;
290 fmb->mii_bus->irq = fmb->irqs;
291
292 ret = mdiobus_register(fmb->mii_bus);
293 if (ret)
294 goto err_mdiobus_alloc;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300295
296 return 0;
297
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700298err_mdiobus_alloc:
299 mdiobus_free(fmb->mii_bus);
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300300err_mdiobus_reg:
301 platform_device_unregister(pdev);
302err_pdev:
303 return ret;
304}
305module_init(fixed_mdio_bus_init);
306
307static void __exit fixed_mdio_bus_exit(void)
308{
309 struct fixed_mdio_bus *fmb = &platform_fmb;
Adrian Bunk651be3a2008-02-02 23:15:02 +0200310 struct fixed_phy *fp, *tmp;
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300311
Lennert Buytenhek298cf9b2008-10-08 16:29:57 -0700312 mdiobus_unregister(fmb->mii_bus);
313 mdiobus_free(fmb->mii_bus);
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300314 platform_device_unregister(pdev);
315
Adrian Bunk651be3a2008-02-02 23:15:02 +0200316 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
Vitaly Borduga79d8e92007-12-07 01:51:22 +0300317 list_del(&fp->node);
318 kfree(fp);
319 }
320}
321module_exit(fixed_mdio_bus_exit);
322
323MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
Vitaly Bordug11b0bac2006-08-14 23:00:29 -0700324MODULE_AUTHOR("Vitaly Bordug");
325MODULE_LICENSE("GPL");