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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#include <linux/idr.h>
27
28#define MII_REGS_NUM 29
29
30struct fixed_mdio_bus {
31 struct mii_bus *mii_bus;
32 struct list_head phys;
33};
34
35struct fixed_phy {
36 int addr;
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;
42 int link_gpio;
43};
44
45static struct platform_device *pdev;
46static struct fixed_mdio_bus platform_fmb = {
47 .phys = LIST_HEAD_INIT(platform_fmb.phys),
48};
49
50static int fixed_phy_update_regs(struct fixed_phy *fp)
51{
52 u16 bmsr = BMSR_ANEGCAPABLE;
53 u16 bmcr = 0;
54 u16 lpagb = 0;
55 u16 lpa = 0;
56
57 if (gpio_is_valid(fp->link_gpio))
58 fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
59
60 if (fp->status.duplex) {
61 switch (fp->status.speed) {
62 case 1000:
63 bmsr |= BMSR_ESTATEN;
64 break;
65 case 100:
66 bmsr |= BMSR_100FULL;
67 break;
68 case 10:
69 bmsr |= BMSR_10FULL;
70 break;
71 default:
72 break;
73 }
74 } else {
75 switch (fp->status.speed) {
76 case 1000:
77 bmsr |= BMSR_ESTATEN;
78 break;
79 case 100:
80 bmsr |= BMSR_100HALF;
81 break;
82 case 10:
83 bmsr |= BMSR_10HALF;
84 break;
85 default:
86 break;
87 }
88 }
89
90 if (fp->status.link) {
91 bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
92
93 if (fp->status.duplex) {
94 bmcr |= BMCR_FULLDPLX;
95
96 switch (fp->status.speed) {
97 case 1000:
98 bmcr |= BMCR_SPEED1000;
99 lpagb |= LPA_1000FULL;
100 break;
101 case 100:
102 bmcr |= BMCR_SPEED100;
103 lpa |= LPA_100FULL;
104 break;
105 case 10:
106 lpa |= LPA_10FULL;
107 break;
108 default:
109 pr_warn("fixed phy: unknown speed\n");
110 return -EINVAL;
111 }
112 } else {
113 switch (fp->status.speed) {
114 case 1000:
115 bmcr |= BMCR_SPEED1000;
116 lpagb |= LPA_1000HALF;
117 break;
118 case 100:
119 bmcr |= BMCR_SPEED100;
120 lpa |= LPA_100HALF;
121 break;
122 case 10:
123 lpa |= LPA_10HALF;
124 break;
125 default:
126 pr_warn("fixed phy: unknown speed\n");
127 return -EINVAL;
128 }
129 }
130
131 if (fp->status.pause)
132 lpa |= LPA_PAUSE_CAP;
133
134 if (fp->status.asym_pause)
135 lpa |= LPA_PAUSE_ASYM;
136 }
137
138 fp->regs[MII_PHYSID1] = 0;
139 fp->regs[MII_PHYSID2] = 0;
140
141 fp->regs[MII_BMSR] = bmsr;
142 fp->regs[MII_BMCR] = bmcr;
143 fp->regs[MII_LPA] = lpa;
144 fp->regs[MII_STAT1000] = lpagb;
145
146 return 0;
147}
148
149static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
150{
151 struct fixed_mdio_bus *fmb = bus->priv;
152 struct fixed_phy *fp;
153
154 if (reg_num >= MII_REGS_NUM)
155 return -1;
156
157
158
159
160 switch (reg_num) {
161 case MII_MMD_CTRL:
162 case MII_MMD_DATA:
163 return -1;
164 default:
165 break;
166 }
167
168 list_for_each_entry(fp, &fmb->phys, node) {
169 if (fp->addr == phy_addr) {
170
171 if (fp->link_update) {
172 fp->link_update(fp->phydev->attached_dev,
173 &fp->status);
174 fixed_phy_update_regs(fp);
175 }
176 return fp->regs[reg_num];
177 }
178 }
179
180 return 0xFFFF;
181}
182
183static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
184 u16 val)
185{
186 return 0;
187}
188
189
190
191
192
193
194int fixed_phy_set_link_update(struct phy_device *phydev,
195 int (*link_update)(struct net_device *,
196 struct fixed_phy_status *))
197{
198 struct fixed_mdio_bus *fmb = &platform_fmb;
199 struct fixed_phy *fp;
200
201 if (!phydev || !phydev->mdio.bus)
202 return -EINVAL;
203
204 list_for_each_entry(fp, &fmb->phys, node) {
205 if (fp->addr == phydev->mdio.addr) {
206 fp->link_update = link_update;
207 fp->phydev = phydev;
208 return 0;
209 }
210 }
211
212 return -ENOENT;
213}
214EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
215
216int fixed_phy_update_state(struct phy_device *phydev,
217 const struct fixed_phy_status *status,
218 const struct fixed_phy_status *changed)
219{
220 struct fixed_mdio_bus *fmb = &platform_fmb;
221 struct fixed_phy *fp;
222
223 if (!phydev || phydev->mdio.bus != fmb->mii_bus)
224 return -EINVAL;
225
226 list_for_each_entry(fp, &fmb->phys, node) {
227 if (fp->addr == phydev->mdio.addr) {
228#define _UPD(x) if (changed->x) \
229 fp->status.x = status->x
230 _UPD(link);
231 _UPD(speed);
232 _UPD(duplex);
233 _UPD(pause);
234 _UPD(asym_pause);
235#undef _UPD
236 fixed_phy_update_regs(fp);
237 return 0;
238 }
239 }
240
241 return -ENOENT;
242}
243EXPORT_SYMBOL(fixed_phy_update_state);
244
245int fixed_phy_add(unsigned int irq, int phy_addr,
246 struct fixed_phy_status *status,
247 int link_gpio)
248{
249 int ret;
250 struct fixed_mdio_bus *fmb = &platform_fmb;
251 struct fixed_phy *fp;
252
253 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
254 if (!fp)
255 return -ENOMEM;
256
257 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
258
259 if (irq != PHY_POLL)
260 fmb->mii_bus->irq[phy_addr] = irq;
261
262 fp->addr = phy_addr;
263 fp->status = *status;
264 fp->link_gpio = link_gpio;
265
266 if (gpio_is_valid(fp->link_gpio)) {
267 ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
268 "fixed-link-gpio-link");
269 if (ret)
270 goto err_regs;
271 }
272
273 ret = fixed_phy_update_regs(fp);
274 if (ret)
275 goto err_gpio;
276
277 list_add_tail(&fp->node, &fmb->phys);
278
279 return 0;
280
281err_gpio:
282 if (gpio_is_valid(fp->link_gpio))
283 gpio_free(fp->link_gpio);
284err_regs:
285 kfree(fp);
286 return ret;
287}
288EXPORT_SYMBOL_GPL(fixed_phy_add);
289
290static DEFINE_IDA(phy_fixed_ida);
291
292static void fixed_phy_del(int phy_addr)
293{
294 struct fixed_mdio_bus *fmb = &platform_fmb;
295 struct fixed_phy *fp, *tmp;
296
297 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
298 if (fp->addr == phy_addr) {
299 list_del(&fp->node);
300 if (gpio_is_valid(fp->link_gpio))
301 gpio_free(fp->link_gpio);
302 kfree(fp);
303 ida_simple_remove(&phy_fixed_ida, phy_addr);
304 return;
305 }
306 }
307}
308
309struct phy_device *fixed_phy_register(unsigned int irq,
310 struct fixed_phy_status *status,
311 int link_gpio,
312 struct device_node *np)
313{
314 struct fixed_mdio_bus *fmb = &platform_fmb;
315 struct phy_device *phy;
316 int phy_addr;
317 int ret;
318
319 if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
320 return ERR_PTR(-EPROBE_DEFER);
321
322
323 phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
324 if (phy_addr < 0)
325 return ERR_PTR(phy_addr);
326
327 ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
328 if (ret < 0) {
329 ida_simple_remove(&phy_fixed_ida, phy_addr);
330 return ERR_PTR(ret);
331 }
332
333 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
334 if (IS_ERR(phy)) {
335 fixed_phy_del(phy_addr);
336 return ERR_PTR(-EINVAL);
337 }
338
339
340 phy->link = status->link;
341 if (status->link) {
342 phy->speed = status->speed;
343 phy->duplex = status->duplex;
344 phy->pause = status->pause;
345 phy->asym_pause = status->asym_pause;
346 }
347
348 of_node_get(np);
349 phy->mdio.dev.of_node = np;
350 phy->is_pseudo_fixed_link = true;
351
352 switch (status->speed) {
353 case SPEED_1000:
354 phy->supported = PHY_1000BT_FEATURES;
355 break;
356 case SPEED_100:
357 phy->supported = PHY_100BT_FEATURES;
358 break;
359 case SPEED_10:
360 default:
361 phy->supported = PHY_10BT_FEATURES;
362 }
363
364 ret = phy_device_register(phy);
365 if (ret) {
366 phy_device_free(phy);
367 of_node_put(np);
368 fixed_phy_del(phy_addr);
369 return ERR_PTR(ret);
370 }
371
372 return phy;
373}
374EXPORT_SYMBOL_GPL(fixed_phy_register);
375
376void fixed_phy_unregister(struct phy_device *phy)
377{
378 phy_device_remove(phy);
379
380 fixed_phy_del(phy->mdio.addr);
381}
382EXPORT_SYMBOL_GPL(fixed_phy_unregister);
383
384static int __init fixed_mdio_bus_init(void)
385{
386 struct fixed_mdio_bus *fmb = &platform_fmb;
387 int ret;
388
389 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
390 if (IS_ERR(pdev)) {
391 ret = PTR_ERR(pdev);
392 goto err_pdev;
393 }
394
395 fmb->mii_bus = mdiobus_alloc();
396 if (fmb->mii_bus == NULL) {
397 ret = -ENOMEM;
398 goto err_mdiobus_reg;
399 }
400
401 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
402 fmb->mii_bus->name = "Fixed MDIO Bus";
403 fmb->mii_bus->priv = fmb;
404 fmb->mii_bus->parent = &pdev->dev;
405 fmb->mii_bus->read = &fixed_mdio_read;
406 fmb->mii_bus->write = &fixed_mdio_write;
407
408 ret = mdiobus_register(fmb->mii_bus);
409 if (ret)
410 goto err_mdiobus_alloc;
411
412 return 0;
413
414err_mdiobus_alloc:
415 mdiobus_free(fmb->mii_bus);
416err_mdiobus_reg:
417 platform_device_unregister(pdev);
418err_pdev:
419 return ret;
420}
421module_init(fixed_mdio_bus_init);
422
423static void __exit fixed_mdio_bus_exit(void)
424{
425 struct fixed_mdio_bus *fmb = &platform_fmb;
426 struct fixed_phy *fp, *tmp;
427
428 mdiobus_unregister(fmb->mii_bus);
429 mdiobus_free(fmb->mii_bus);
430 platform_device_unregister(pdev);
431
432 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
433 list_del(&fp->node);
434 kfree(fp);
435 }
436 ida_destroy(&phy_fixed_ida);
437}
438module_exit(fixed_mdio_bus_exit);
439
440MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
441MODULE_AUTHOR("Vitaly Bordug");
442MODULE_LICENSE("GPL");
443
