tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
3 *
4 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
5 * Anton Vorontsov <avorontsov@ru.mvista.com>
6 *
7 * Copyright (c) 2006-2007 MontaVista Software, Inc.
8 *
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.
13 */
14
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>
24#include <linux/of.h>
25
26#define MII_REGS_NUM 29
27
28struct fixed_mdio_bus {
29 int irqs[PHY_MAX_ADDR];
30 struct mii_bus *mii_bus;
31 struct list_head phys;
32};
33
34struct fixed_phy {
35 int addr;
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;
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)
49{
50 u16 bmsr = BMSR_ANEGCAPABLE;
51 u16 bmcr = 0;
52 u16 lpagb = 0;
53 u16 lpa = 0;
54
55 if (fp->status.duplex) {
56 bmcr |= BMCR_FULLDPLX;
57
58 switch (fp->status.speed) {
59 case 1000:
60 bmsr |= BMSR_ESTATEN;
61 bmcr |= BMCR_SPEED1000;
62 lpagb |= LPA_1000FULL;
63 break;
64 case 100:
65 bmsr |= BMSR_100FULL;
66 bmcr |= BMCR_SPEED100;
67 lpa |= LPA_100FULL;
68 break;
69 case 10:
70 bmsr |= BMSR_10FULL;
71 lpa |= LPA_10FULL;
72 break;
73 default:
74 pr_warn("fixed phy: unknown speed\n");
75 return -EINVAL;
76 }
77 } else {
78 switch (fp->status.speed) {
79 case 1000:
80 bmsr |= BMSR_ESTATEN;
81 bmcr |= BMCR_SPEED1000;
82 lpagb |= LPA_1000HALF;
83 break;
84 case 100:
85 bmsr |= BMSR_100HALF;
86 bmcr |= BMCR_SPEED100;
87 lpa |= LPA_100HALF;
88 break;
89 case 10:
90 bmsr |= BMSR_10HALF;
91 lpa |= LPA_10HALF;
92 break;
93 default:
94 pr_warn("fixed phy: unknown speed\n");
95 return -EINVAL;
96 }
97 }
98
99 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
108 fp->regs[MII_PHYSID1] = 0;
109 fp->regs[MII_PHYSID2] = 0;
110
111 fp->regs[MII_BMSR] = bmsr;
112 fp->regs[MII_BMCR] = bmcr;
113 fp->regs[MII_LPA] = lpa;
114 fp->regs[MII_STAT1000] = lpagb;
115
116 return 0;
117}
118
119static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
120{
121 struct fixed_mdio_bus *fmb = bus->priv;
122 struct fixed_phy *fp;
123
124 if (reg_num >= MII_REGS_NUM)
125 return -1;
126
127 list_for_each_entry(fp, &fmb->phys, node) {
128 if (fp->addr == phy_addr) {
129 /* 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 }
137 }
138
139 return 0xFFFF;
140}
141
142static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
143 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) {
164 if (fp->addr == phydev->addr) {
165 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
175int fixed_phy_add(unsigned int irq, int phy_addr,
176 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
188 fmb->irqs[phy_addr] = irq;
189
190 fp->addr = phy_addr;
191 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
207void 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
267static 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);
273 if (IS_ERR(pdev)) {
274 ret = PTR_ERR(pdev);
275 goto err_pdev;
276 }
277
278 fmb->mii_bus = mdiobus_alloc();
279 if (fmb->mii_bus == NULL) {
280 ret = -ENOMEM;
281 goto err_mdiobus_reg;
282 }
283
284 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
285 fmb->mii_bus->name = "Fixed MDIO Bus";
286 fmb->mii_bus->priv = fmb;
287 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;
295
296 return 0;
297
298err_mdiobus_alloc:
299 mdiobus_free(fmb->mii_bus);
300err_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;
310 struct fixed_phy *fp, *tmp;
311
312 mdiobus_unregister(fmb->mii_bus);
313 mdiobus_free(fmb->mii_bus);
314 platform_device_unregister(pdev);
315
316 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
317 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)");
324MODULE_AUTHOR("Vitaly Bordug");
325MODULE_LICENSE("GPL");