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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
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
128
129
130 switch (reg_num) {
131 case MII_MMD_CTRL:
132 case MII_MMD_DATA:
133 return -1;
134 default:
135 break;
136 }
137
138 list_for_each_entry(fp, &fmb->phys, node) {
139 if (fp->addr == phy_addr) {
140
141 if (fp->link_update) {
142 fp->link_update(fp->phydev->attached_dev,
143 &fp->status);
144 fixed_phy_update_regs(fp);
145 }
146 return fp->regs[reg_num];
147 }
148 }
149
150 return 0xFFFF;
151}
152
153static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
154 u16 val)
155{
156 return 0;
157}
158
159
160
161
162
163
164int fixed_phy_set_link_update(struct phy_device *phydev,
165 int (*link_update)(struct net_device *,
166 struct fixed_phy_status *))
167{
168 struct fixed_mdio_bus *fmb = &platform_fmb;
169 struct fixed_phy *fp;
170
171 if (!phydev || !phydev->bus)
172 return -EINVAL;
173
174 list_for_each_entry(fp, &fmb->phys, node) {
175 if (fp->addr == phydev->addr) {
176 fp->link_update = link_update;
177 fp->phydev = phydev;
178 return 0;
179 }
180 }
181
182 return -ENOENT;
183}
184EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
185
186int fixed_phy_update_state(struct phy_device *phydev,
187 const struct fixed_phy_status *status,
188 const struct fixed_phy_status *changed)
189{
190 struct fixed_mdio_bus *fmb = &platform_fmb;
191 struct fixed_phy *fp;
192
193 if (!phydev || !phydev->bus)
194 return -EINVAL;
195
196 list_for_each_entry(fp, &fmb->phys, node) {
197 if (fp->addr == phydev->addr) {
198#define _UPD(x) if (changed->x) \
199 fp->status.x = status->x
200 _UPD(link);
201 _UPD(speed);
202 _UPD(duplex);
203 _UPD(pause);
204 _UPD(asym_pause);
205#undef _UPD
206 fixed_phy_update_regs(fp);
207 return 0;
208 }
209 }
210
211 return -ENOENT;
212}
213EXPORT_SYMBOL(fixed_phy_update_state);
214
215int fixed_phy_add(unsigned int irq, int phy_addr,
216 struct fixed_phy_status *status)
217{
218 int ret;
219 struct fixed_mdio_bus *fmb = &platform_fmb;
220 struct fixed_phy *fp;
221
222 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
223 if (!fp)
224 return -ENOMEM;
225
226 memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
227
228 fmb->irqs[phy_addr] = irq;
229
230 fp->addr = phy_addr;
231 fp->status = *status;
232
233 ret = fixed_phy_update_regs(fp);
234 if (ret)
235 goto err_regs;
236
237 list_add_tail(&fp->node, &fmb->phys);
238
239 return 0;
240
241err_regs:
242 kfree(fp);
243 return ret;
244}
245EXPORT_SYMBOL_GPL(fixed_phy_add);
246
247void fixed_phy_del(int phy_addr)
248{
249 struct fixed_mdio_bus *fmb = &platform_fmb;
250 struct fixed_phy *fp, *tmp;
251
252 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
253 if (fp->addr == phy_addr) {
254 list_del(&fp->node);
255 kfree(fp);
256 return;
257 }
258 }
259}
260EXPORT_SYMBOL_GPL(fixed_phy_del);
261
262static int phy_fixed_addr;
263static DEFINE_SPINLOCK(phy_fixed_addr_lock);
264
265struct phy_device *fixed_phy_register(unsigned int irq,
266 struct fixed_phy_status *status,
267 struct device_node *np)
268{
269 struct fixed_mdio_bus *fmb = &platform_fmb;
270 struct phy_device *phy;
271 int phy_addr;
272 int ret;
273
274
275 spin_lock(&phy_fixed_addr_lock);
276 if (phy_fixed_addr == PHY_MAX_ADDR) {
277 spin_unlock(&phy_fixed_addr_lock);
278 return ERR_PTR(-ENOSPC);
279 }
280 phy_addr = phy_fixed_addr++;
281 spin_unlock(&phy_fixed_addr_lock);
282
283 ret = fixed_phy_add(PHY_POLL, phy_addr, status);
284 if (ret < 0)
285 return ERR_PTR(ret);
286
287 phy = get_phy_device(fmb->mii_bus, phy_addr, false);
288 if (!phy || IS_ERR(phy)) {
289 fixed_phy_del(phy_addr);
290 return ERR_PTR(-EINVAL);
291 }
292
293 of_node_get(np);
294 phy->dev.of_node = np;
295
296 ret = phy_device_register(phy);
297 if (ret) {
298 phy_device_free(phy);
299 of_node_put(np);
300 fixed_phy_del(phy_addr);
301 return ERR_PTR(ret);
302 }
303
304 return phy;
305}
306EXPORT_SYMBOL_GPL(fixed_phy_register);
307
308static int __init fixed_mdio_bus_init(void)
309{
310 struct fixed_mdio_bus *fmb = &platform_fmb;
311 int ret;
312
313 pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
314 if (IS_ERR(pdev)) {
315 ret = PTR_ERR(pdev);
316 goto err_pdev;
317 }
318
319 fmb->mii_bus = mdiobus_alloc();
320 if (fmb->mii_bus == NULL) {
321 ret = -ENOMEM;
322 goto err_mdiobus_reg;
323 }
324
325 snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
326 fmb->mii_bus->name = "Fixed MDIO Bus";
327 fmb->mii_bus->priv = fmb;
328 fmb->mii_bus->parent = &pdev->dev;
329 fmb->mii_bus->read = &fixed_mdio_read;
330 fmb->mii_bus->write = &fixed_mdio_write;
331 fmb->mii_bus->irq = fmb->irqs;
332
333 ret = mdiobus_register(fmb->mii_bus);
334 if (ret)
335 goto err_mdiobus_alloc;
336
337 return 0;
338
339err_mdiobus_alloc:
340 mdiobus_free(fmb->mii_bus);
341err_mdiobus_reg:
342 platform_device_unregister(pdev);
343err_pdev:
344 return ret;
345}
346module_init(fixed_mdio_bus_init);
347
348static void __exit fixed_mdio_bus_exit(void)
349{
350 struct fixed_mdio_bus *fmb = &platform_fmb;
351 struct fixed_phy *fp, *tmp;
352
353 mdiobus_unregister(fmb->mii_bus);
354 mdiobus_free(fmb->mii_bus);
355 platform_device_unregister(pdev);
356
357 list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
358 list_del(&fp->node);
359 kfree(fp);
360 }
361}
362module_exit(fixed_mdio_bus_exit);
363
364MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
365MODULE_AUTHOR("Vitaly Bordug");
366MODULE_LICENSE("GPL");
367
