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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#include <linux/gpio.h>
26
27#define MII_REGS_NUM 29
28
29struct fixed_mdio_bus {
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 int link_gpio;
42};
43
44static struct platform_device *pdev;
45static struct fixed_mdio_bus platform_fmb = {
46 .phys = LIST_HEAD_INIT(platform_fmb.phys),
47};
48
49static int fixed_phy_update_regs(struct fixed_phy *fp)
50{
51 u16 bmsr = BMSR_ANEGCAPABLE;
52 u16 bmcr = 0;
53 u16 lpagb = 0;
54 u16 lpa = 0;
55
56 if (gpio_is_valid(fp->link_gpio))
57 fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
58
59 if (fp->status.duplex) {
60 switch (fp->status.speed) {
61 case 1000:
62 bmsr |= BMSR_ESTATEN;
63 break;
64 case 100:
65 bmsr |= BMSR_100FULL;
66 break;
67 case 10:
68 bmsr |= BMSR_10FULL;
69 break;
70 default:
71 break;
72 }
73 } else {
74 switch (fp->status.speed) {
75 case 1000:
76 bmsr |= BMSR_ESTATEN;
77 break;
78 case 100:
79 bmsr |= BMSR_100HALF;
80 break;
81 case 10:
82 bmsr |= BMSR_10HALF;
83 break;
84 default:
85 break;
86 }
87 }
88
89 if (fp->status.link) {
90 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
91
92 if (fp->status.duplex) {
93 bmcr |= BMCR_FULLDPLX;
94
95 switch (fp->status.speed) {
96 case 1000:
97 bmcr |= BMCR_SPEED1000;
98 lpagb |= LPA_1000FULL;
99 break;
100 case 100:
101 bmcr |= BMCR_SPEED100;
102 lpa |= LPA_100FULL;
103 break;
104 case 10:
105 lpa |= LPA_10FULL;
106 break;
107 default:
108 pr_warn("fixed phy: unknown speed\n");
109 return -EINVAL;
110 }
111 } else {
112 switch (fp->status.speed) {
113 case 1000:
114 bmcr |= BMCR_SPEED1000;
115 lpagb |= LPA_1000HALF;
116 break;
117 case 100:
118 bmcr |= BMCR_SPEED100;
119 lpa |= LPA_100HALF;
120 break;
121 case 10:
122 lpa |= LPA_10HALF;
123 break;
124 default:
125 pr_warn("fixed phy: unknown speed\n");
126 return -EINVAL;
127 }
128 }
129
130 if (fp->status.pause)
131 lpa |= LPA_PAUSE_CAP;
132
133 if (fp->status.asym_pause)
134 lpa |= LPA_PAUSE_ASYM;
135 }
136
137 fp->regs[MII_PHYSID1] = 0;
138 fp->regs[MII_PHYSID2] = 0;
139
140 fp->regs[MII_BMSR] = bmsr;
141 fp->regs[MII_BMCR] = bmcr;
142 fp->regs[MII_LPA] = lpa;
143 fp->regs[MII_STAT1000] = lpagb;
144
145 return 0;
146}
147
148static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
149{
150 struct fixed_mdio_bus *fmb = bus->priv;
151 struct fixed_phy *fp;
152
153 if (reg_num >= MII_REGS_NUM)
154 return -1;
155
156 /* We do not support emulating Clause 45 over Clause 22 register reads
157 * return an error instead of bogus data.
158 */
159 switch (reg_num) {
160 case MII_MMD_CTRL:
161 case MII_MMD_DATA:
162 return -1;
163 default:
164 break;
165 }
166
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,
172 &fp->status);
173 fixed_phy_update_regs(fp);
174 }
175 return fp->regs[reg_num];
176 }
177 }
178
179 return 0xFFFF;
180}
181
182static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
183 u16 val)
184{
185 return 0;
186}
187
188/*
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.
192 */
193int fixed_phy_set_link_update(struct phy_device *phydev,
194 int (*link_update)(struct net_device *,
195 struct fixed_phy_status *))
196{
197 struct fixed_mdio_bus *fmb = &platform_fmb;
198 struct fixed_phy *fp;
199
200 if (!phydev || !phydev->mdio.bus)
201 return -EINVAL;
202
203 list_for_each_entry(fp, &fmb->phys, node) {
204 if (fp->addr == phydev->mdio.addr) {
205 fp->link_update = link_update;
206 fp->phydev = phydev;
207 return 0;
208 }
209 }
210
211 return -ENOENT;
212}
213EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
214
215int fixed_phy_update_state(struct phy_device *phydev,
216 const struct fixed_phy_status *status,
217 const struct fixed_phy_status *changed)
218{
219 struct fixed_mdio_bus *fmb = &platform_fmb;
220 struct fixed_phy *fp;
221
222 if (!phydev || phydev->mdio.bus != fmb->mii_bus)
223 return -EINVAL;
224
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
229 _UPD(link);
230 _UPD(speed);
231 _UPD(duplex);
232 _UPD(pause);
233 _UPD(asym_pause);
234#undef _UPD
235 fixed_phy_update_regs(fp);
236 return 0;
237 }
238 }
239
240 return -ENOENT;
241}
242EXPORT_SYMBOL(fixed_phy_update_state);
243
244int fixed_phy_add(unsigned int irq, int phy_addr,
245 struct fixed_phy_status *status,
246 int link_gpio)
247{
248 int ret;
249 struct fixed_mdio_bus *fmb = &platform_fmb;
250 struct fixed_phy *fp;
251
252 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
253 if (!fp)
254 return -ENOMEM;
255
256 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
257
258 fmb->mii_bus->irq[phy_addr] = irq;
259
260 fp->addr = phy_addr;
261 fp->status = *status;
262 fp->link_gpio = link_gpio;
263
264 if (gpio_is_valid(fp->link_gpio)) {
265 ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
266 "fixed-link-gpio-link");
267 if (ret)
268 goto err_regs;
269 }
270
271 ret = fixed_phy_update_regs(fp);
272 if (ret)
273 goto err_gpio;
274
275 list_add_tail(&fp->node, &fmb->phys);
276
277 return 0;
278
279err_gpio:
280 if (gpio_is_valid(fp->link_gpio))
281 gpio_free(fp->link_gpio);
282err_regs:
283 kfree(fp);
284 return ret;
285}
286EXPORT_SYMBOL_GPL(fixed_phy_add);
287
288static void fixed_phy_del(int phy_addr)
289{
290 struct fixed_mdio_bus *fmb = &platform_fmb;
291 struct fixed_phy *fp, *tmp;
292
293 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
294 if (fp->addr == phy_addr) {
295 list_del(&fp->node);
296 if (gpio_is_valid(fp->link_gpio))
297 gpio_free(fp->link_gpio);
298 kfree(fp);
299 return;
300 }
301 }
302}
303
304static int phy_fixed_addr;
305static DEFINE_SPINLOCK(phy_fixed_addr_lock);
306
307struct phy_device *fixed_phy_register(unsigned int irq,
308 struct fixed_phy_status *status,
309 int link_gpio,
310 struct device_node *np)
311{
312 struct fixed_mdio_bus *fmb = &platform_fmb;
313 struct phy_device *phy;
314 int phy_addr;
315 int ret;
316
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);
322 }
323 phy_addr = phy_fixed_addr++;
324 spin_unlock(&phy_fixed_addr_lock);
325
326 ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
327 if (ret < 0)
328 return ERR_PTR(ret);
329
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);
334 }
335
336 /* propagate the fixed link values to struct phy_device */
337 phy->link = status->link;
338 if (status->link) {
339 phy->speed = status->speed;
340 phy->duplex = status->duplex;
341 phy->pause = status->pause;
342 phy->asym_pause = status->asym_pause;
343 }
344
345 of_node_get(np);
346 phy->mdio.dev.of_node = np;
347 phy->is_pseudo_fixed_link = true;
348
349 switch (status->speed) {
350 case SPEED_1000:
351 phy->supported = PHY_1000BT_FEATURES;
352 break;
353 case SPEED_100:
354 phy->supported = PHY_100BT_FEATURES;
355 break;
356 case SPEED_10:
357 default:
358 phy->supported = PHY_10BT_FEATURES;
359 }
360
361 ret = phy_device_register(phy);
362 if (ret) {
363 phy_device_free(phy);
364 of_node_put(np);
365 fixed_phy_del(phy_addr);
366 return ERR_PTR(ret);
367 }
368
369 return phy;
370}
371EXPORT_SYMBOL_GPL(fixed_phy_register);
372
373void fixed_phy_unregister(struct phy_device *phy)
374{
375 phy_device_remove(phy);
376
377 fixed_phy_del(phy->mdio.addr);
378}
379EXPORT_SYMBOL_GPL(fixed_phy_unregister);
380
381static int __init fixed_mdio_bus_init(void)
382{
383 struct fixed_mdio_bus *fmb = &platform_fmb;
384 int ret;
385
386 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
387 if (IS_ERR(pdev)) {
388 ret = PTR_ERR(pdev);
389 goto err_pdev;
390 }
391
392 fmb->mii_bus = mdiobus_alloc();
393 if (fmb->mii_bus == NULL) {
394 ret = -ENOMEM;
395 goto err_mdiobus_reg;
396 }
397
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;
404
405 ret = mdiobus_register(fmb->mii_bus);
406 if (ret)
407 goto err_mdiobus_alloc;
408
409 return 0;
410
411err_mdiobus_alloc:
412 mdiobus_free(fmb->mii_bus);
413err_mdiobus_reg:
414 platform_device_unregister(pdev);
415err_pdev:
416 return ret;
417}
418module_init(fixed_mdio_bus_init);
419
420static void __exit fixed_mdio_bus_exit(void)
421{
422 struct fixed_mdio_bus *fmb = &platform_fmb;
423 struct fixed_phy *fp, *tmp;
424
425 mdiobus_unregister(fmb->mii_bus);
426 mdiobus_free(fmb->mii_bus);
427 platform_device_unregister(pdev);
428
429 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
430 list_del(&fp->node);
431 kfree(fp);
432 }
433}
434module_exit(fixed_mdio_bus_exit);
435
436MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
437MODULE_AUTHOR("Vitaly Bordug");
438MODULE_LICENSE("GPL");