This source file includes following definitions.
- fixed_phy_change_carrier
- fixed_phy_update
- fixed_mdio_read
- fixed_mdio_write
- fixed_phy_set_link_update
- fixed_phy_add_gpiod
- fixed_phy_add
- fixed_phy_del
- fixed_phy_get_gpiod
- fixed_phy_get_gpiod
- __fixed_phy_register
- fixed_phy_register
- fixed_phy_register_with_gpiod
- fixed_phy_unregister
- fixed_mdio_bus_init
- fixed_mdio_bus_exit
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11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/list.h>
15 #include <linux/mii.h>
16 #include <linux/phy.h>
17 #include <linux/phy_fixed.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/of.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/seqlock.h>
23 #include <linux/idr.h>
24 #include <linux/netdevice.h>
25 #include <linux/linkmode.h>
26
27 #include "swphy.h"
28
29 struct fixed_mdio_bus {
30 struct mii_bus *mii_bus;
31 struct list_head phys;
32 };
33
34 struct fixed_phy {
35 int addr;
36 struct phy_device *phydev;
37 seqcount_t seqcount;
38 struct fixed_phy_status status;
39 bool no_carrier;
40 int (*link_update)(struct net_device *, struct fixed_phy_status *);
41 struct list_head node;
42 struct gpio_desc *link_gpiod;
43 };
44
45 static struct platform_device *pdev;
46 static struct fixed_mdio_bus platform_fmb = {
47 .phys = LIST_HEAD_INIT(platform_fmb.phys),
48 };
49
50 int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier)
51 {
52 struct fixed_mdio_bus *fmb = &platform_fmb;
53 struct phy_device *phydev = dev->phydev;
54 struct fixed_phy *fp;
55
56 if (!phydev || !phydev->mdio.bus)
57 return -EINVAL;
58
59 list_for_each_entry(fp, &fmb->phys, node) {
60 if (fp->addr == phydev->mdio.addr) {
61 fp->no_carrier = !new_carrier;
62 return 0;
63 }
64 }
65 return -EINVAL;
66 }
67 EXPORT_SYMBOL_GPL(fixed_phy_change_carrier);
68
69 static void fixed_phy_update(struct fixed_phy *fp)
70 {
71 if (!fp->no_carrier && fp->link_gpiod)
72 fp->status.link = !!gpiod_get_value_cansleep(fp->link_gpiod);
73 }
74
75 static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
76 {
77 struct fixed_mdio_bus *fmb = bus->priv;
78 struct fixed_phy *fp;
79
80 list_for_each_entry(fp, &fmb->phys, node) {
81 if (fp->addr == phy_addr) {
82 struct fixed_phy_status state;
83 int s;
84
85 do {
86 s = read_seqcount_begin(&fp->seqcount);
87 fp->status.link = !fp->no_carrier;
88
89 if (fp->link_update)
90 fp->link_update(fp->phydev->attached_dev,
91 &fp->status);
92
93 fixed_phy_update(fp);
94 state = fp->status;
95 } while (read_seqcount_retry(&fp->seqcount, s));
96
97 return swphy_read_reg(reg_num, &state);
98 }
99 }
100
101 return 0xFFFF;
102 }
103
104 static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
105 u16 val)
106 {
107 return 0;
108 }
109
110
111
112
113
114
115 int fixed_phy_set_link_update(struct phy_device *phydev,
116 int (*link_update)(struct net_device *,
117 struct fixed_phy_status *))
118 {
119 struct fixed_mdio_bus *fmb = &platform_fmb;
120 struct fixed_phy *fp;
121
122 if (!phydev || !phydev->mdio.bus)
123 return -EINVAL;
124
125 list_for_each_entry(fp, &fmb->phys, node) {
126 if (fp->addr == phydev->mdio.addr) {
127 fp->link_update = link_update;
128 fp->phydev = phydev;
129 return 0;
130 }
131 }
132
133 return -ENOENT;
134 }
135 EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
136
137 static int fixed_phy_add_gpiod(unsigned int irq, int phy_addr,
138 struct fixed_phy_status *status,
139 struct gpio_desc *gpiod)
140 {
141 int ret;
142 struct fixed_mdio_bus *fmb = &platform_fmb;
143 struct fixed_phy *fp;
144
145 ret = swphy_validate_state(status);
146 if (ret < 0)
147 return ret;
148
149 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
150 if (!fp)
151 return -ENOMEM;
152
153 seqcount_init(&fp->seqcount);
154
155 if (irq != PHY_POLL)
156 fmb->mii_bus->irq[phy_addr] = irq;
157
158 fp->addr = phy_addr;
159 fp->status = *status;
160 fp->link_gpiod = gpiod;
161
162 fixed_phy_update(fp);
163
164 list_add_tail(&fp->node, &fmb->phys);
165
166 return 0;
167 }
168
169 int fixed_phy_add(unsigned int irq, int phy_addr,
170 struct fixed_phy_status *status) {
171
172 return fixed_phy_add_gpiod(irq, phy_addr, status, NULL);
173 }
174 EXPORT_SYMBOL_GPL(fixed_phy_add);
175
176 static DEFINE_IDA(phy_fixed_ida);
177
178 static void fixed_phy_del(int phy_addr)
179 {
180 struct fixed_mdio_bus *fmb = &platform_fmb;
181 struct fixed_phy *fp, *tmp;
182
183 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
184 if (fp->addr == phy_addr) {
185 list_del(&fp->node);
186 if (fp->link_gpiod)
187 gpiod_put(fp->link_gpiod);
188 kfree(fp);
189 ida_simple_remove(&phy_fixed_ida, phy_addr);
190 return;
191 }
192 }
193 }
194
195 #ifdef CONFIG_OF_GPIO
196 static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
197 {
198 struct device_node *fixed_link_node;
199 struct gpio_desc *gpiod;
200
201 if (!np)
202 return NULL;
203
204 fixed_link_node = of_get_child_by_name(np, "fixed-link");
205 if (!fixed_link_node)
206 return NULL;
207
208
209
210
211
212
213 gpiod = gpiod_get_from_of_node(fixed_link_node, "link-gpios", 0,
214 GPIOD_IN, "mdio");
215 if (IS_ERR(gpiod) && PTR_ERR(gpiod) != -EPROBE_DEFER) {
216 if (PTR_ERR(gpiod) != -ENOENT)
217 pr_err("error getting GPIO for fixed link %pOF, proceed without\n",
218 fixed_link_node);
219 gpiod = NULL;
220 }
221 of_node_put(fixed_link_node);
222
223 return gpiod;
224 }
225 #else
226 static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
227 {
228 return NULL;
229 }
230 #endif
231
232 static struct phy_device *__fixed_phy_register(unsigned int irq,
233 struct fixed_phy_status *status,
234 struct device_node *np,
235 struct gpio_desc *gpiod)
236 {
237 struct fixed_mdio_bus *fmb = &platform_fmb;
238 struct phy_device *phy;
239 int phy_addr;
240 int ret;
241
242 if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
243 return ERR_PTR(-EPROBE_DEFER);
244
245
246 if (!gpiod) {
247 gpiod = fixed_phy_get_gpiod(np);
248 if (IS_ERR(gpiod))
249 return ERR_CAST(gpiod);
250 }
251
252
253 phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
254 if (phy_addr < 0)
255 return ERR_PTR(phy_addr);
256
257 ret = fixed_phy_add_gpiod(irq, phy_addr, status, gpiod);
258 if (ret < 0) {
259 ida_simple_remove(&phy_fixed_ida, phy_addr);
260 return ERR_PTR(ret);
261 }
262
263 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
264 if (IS_ERR(phy)) {
265 fixed_phy_del(phy_addr);
266 return ERR_PTR(-EINVAL);
267 }
268
269
270 phy->link = status->link;
271 if (status->link) {
272 phy->speed = status->speed;
273 phy->duplex = status->duplex;
274 phy->pause = status->pause;
275 phy->asym_pause = status->asym_pause;
276 }
277
278 of_node_get(np);
279 phy->mdio.dev.of_node = np;
280 phy->is_pseudo_fixed_link = true;
281
282 switch (status->speed) {
283 case SPEED_1000:
284 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
285 phy->supported);
286 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
287 phy->supported);
288
289 case SPEED_100:
290 linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
291 phy->supported);
292 linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
293 phy->supported);
294
295 case SPEED_10:
296 default:
297 linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
298 phy->supported);
299 linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
300 phy->supported);
301 }
302
303 phy_advertise_supported(phy);
304
305 ret = phy_device_register(phy);
306 if (ret) {
307 phy_device_free(phy);
308 of_node_put(np);
309 fixed_phy_del(phy_addr);
310 return ERR_PTR(ret);
311 }
312
313 return phy;
314 }
315
316 struct phy_device *fixed_phy_register(unsigned int irq,
317 struct fixed_phy_status *status,
318 struct device_node *np)
319 {
320 return __fixed_phy_register(irq, status, np, NULL);
321 }
322 EXPORT_SYMBOL_GPL(fixed_phy_register);
323
324 struct phy_device *
325 fixed_phy_register_with_gpiod(unsigned int irq,
326 struct fixed_phy_status *status,
327 struct gpio_desc *gpiod)
328 {
329 return __fixed_phy_register(irq, status, NULL, gpiod);
330 }
331 EXPORT_SYMBOL_GPL(fixed_phy_register_with_gpiod);
332
333 void fixed_phy_unregister(struct phy_device *phy)
334 {
335 phy_device_remove(phy);
336 of_node_put(phy->mdio.dev.of_node);
337 fixed_phy_del(phy->mdio.addr);
338 }
339 EXPORT_SYMBOL_GPL(fixed_phy_unregister);
340
341 static int __init fixed_mdio_bus_init(void)
342 {
343 struct fixed_mdio_bus *fmb = &platform_fmb;
344 int ret;
345
346 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
347 if (IS_ERR(pdev))
348 return PTR_ERR(pdev);
349
350 fmb->mii_bus = mdiobus_alloc();
351 if (fmb->mii_bus == NULL) {
352 ret = -ENOMEM;
353 goto err_mdiobus_reg;
354 }
355
356 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
357 fmb->mii_bus->name = "Fixed MDIO Bus";
358 fmb->mii_bus->priv = fmb;
359 fmb->mii_bus->parent = &pdev->dev;
360 fmb->mii_bus->read = &fixed_mdio_read;
361 fmb->mii_bus->write = &fixed_mdio_write;
362
363 ret = mdiobus_register(fmb->mii_bus);
364 if (ret)
365 goto err_mdiobus_alloc;
366
367 return 0;
368
369 err_mdiobus_alloc:
370 mdiobus_free(fmb->mii_bus);
371 err_mdiobus_reg:
372 platform_device_unregister(pdev);
373 return ret;
374 }
375 module_init(fixed_mdio_bus_init);
376
377 static void __exit fixed_mdio_bus_exit(void)
378 {
379 struct fixed_mdio_bus *fmb = &platform_fmb;
380 struct fixed_phy *fp, *tmp;
381
382 mdiobus_unregister(fmb->mii_bus);
383 mdiobus_free(fmb->mii_bus);
384 platform_device_unregister(pdev);
385
386 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
387 list_del(&fp->node);
388 kfree(fp);
389 }
390 ida_destroy(&phy_fixed_ida);
391 }
392 module_exit(fixed_mdio_bus_exit);
393
394 MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
395 MODULE_AUTHOR("Vitaly Bordug");
396 MODULE_LICENSE("GPL");