Commit | Line | Data |
---|---|---|
11b0bacd | 1 | /* |
a79d8e93 | 2 | * Fixed MDIO bus (MDIO bus emulation with fixed PHYs) |
11b0bacd | 3 | * |
a79d8e93 VB |
4 | * Author: Vitaly Bordug <vbordug@ru.mvista.com> |
5 | * Anton Vorontsov <avorontsov@ru.mvista.com> | |
11b0bacd | 6 | * |
a79d8e93 | 7 | * Copyright (c) 2006-2007 MontaVista Software, Inc. |
11b0bacd VB |
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. | |
11b0bacd | 13 | */ |
a79d8e93 | 14 | |
11b0bacd | 15 | #include <linux/kernel.h> |
11b0bacd | 16 | #include <linux/module.h> |
a79d8e93 VB |
17 | #include <linux/platform_device.h> |
18 | #include <linux/list.h> | |
11b0bacd | 19 | #include <linux/mii.h> |
11b0bacd | 20 | #include <linux/phy.h> |
7c32f470 | 21 | #include <linux/phy_fixed.h> |
57401d5e | 22 | #include <linux/err.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
a7595121 | 24 | #include <linux/of.h> |
11b0bacd | 25 | |
a79d8e93 | 26 | #define MII_REGS_NUM 29 |
11b0bacd | 27 | |
a79d8e93 VB |
28 | struct fixed_mdio_bus { |
29 | int irqs[PHY_MAX_ADDR]; | |
298cf9be | 30 | struct mii_bus *mii_bus; |
a79d8e93 VB |
31 | struct list_head phys; |
32 | }; | |
11b0bacd | 33 | |
a79d8e93 | 34 | struct fixed_phy { |
9b744942 | 35 | int addr; |
a79d8e93 VB |
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 | }; | |
7c32f470 | 42 | |
a79d8e93 VB |
43 | static struct platform_device *pdev; |
44 | static struct fixed_mdio_bus platform_fmb = { | |
45 | .phys = LIST_HEAD_INIT(platform_fmb.phys), | |
46 | }; | |
7c32f470 | 47 | |
a79d8e93 | 48 | static int fixed_phy_update_regs(struct fixed_phy *fp) |
11b0bacd | 49 | { |
a79d8e93 | 50 | u16 bmsr = BMSR_ANEGCAPABLE; |
11b0bacd | 51 | u16 bmcr = 0; |
a79d8e93 VB |
52 | u16 lpagb = 0; |
53 | u16 lpa = 0; | |
11b0bacd | 54 | |
868a4215 SS |
55 | if (!fp->status.link) |
56 | goto done; | |
57 | bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE; | |
58 | ||
a79d8e93 | 59 | if (fp->status.duplex) { |
11b0bacd VB |
60 | bmcr |= BMCR_FULLDPLX; |
61 | ||
a79d8e93 VB |
62 | switch (fp->status.speed) { |
63 | case 1000: | |
64 | bmsr |= BMSR_ESTATEN; | |
65 | bmcr |= BMCR_SPEED1000; | |
66 | lpagb |= LPA_1000FULL; | |
67 | break; | |
11b0bacd VB |
68 | case 100: |
69 | bmsr |= BMSR_100FULL; | |
70 | bmcr |= BMCR_SPEED100; | |
a79d8e93 | 71 | lpa |= LPA_100FULL; |
7c32f470 | 72 | break; |
11b0bacd VB |
73 | case 10: |
74 | bmsr |= BMSR_10FULL; | |
a79d8e93 | 75 | lpa |= LPA_10FULL; |
7c32f470 | 76 | break; |
a79d8e93 | 77 | default: |
8d242488 | 78 | pr_warn("fixed phy: unknown speed\n"); |
a79d8e93 | 79 | return -EINVAL; |
11b0bacd VB |
80 | } |
81 | } else { | |
a79d8e93 VB |
82 | switch (fp->status.speed) { |
83 | case 1000: | |
84 | bmsr |= BMSR_ESTATEN; | |
85 | bmcr |= BMCR_SPEED1000; | |
86 | lpagb |= LPA_1000HALF; | |
87 | break; | |
11b0bacd VB |
88 | case 100: |
89 | bmsr |= BMSR_100HALF; | |
90 | bmcr |= BMCR_SPEED100; | |
a79d8e93 | 91 | lpa |= LPA_100HALF; |
7c32f470 | 92 | break; |
11b0bacd | 93 | case 10: |
a79d8e93 VB |
94 | bmsr |= BMSR_10HALF; |
95 | lpa |= LPA_10HALF; | |
7c32f470 | 96 | break; |
a79d8e93 | 97 | default: |
8d242488 | 98 | pr_warn("fixed phy: unknown speed\n"); |
a79d8e93 | 99 | return -EINVAL; |
11b0bacd VB |
100 | } |
101 | } | |
102 | ||
a79d8e93 VB |
103 | if (fp->status.pause) |
104 | lpa |= LPA_PAUSE_CAP; | |
105 | ||
106 | if (fp->status.asym_pause) | |
107 | lpa |= LPA_PAUSE_ASYM; | |
108 | ||
868a4215 | 109 | done: |
9b744942 TP |
110 | fp->regs[MII_PHYSID1] = 0; |
111 | fp->regs[MII_PHYSID2] = 0; | |
a79d8e93 VB |
112 | |
113 | fp->regs[MII_BMSR] = bmsr; | |
114 | fp->regs[MII_BMCR] = bmcr; | |
115 | fp->regs[MII_LPA] = lpa; | |
116 | fp->regs[MII_STAT1000] = lpagb; | |
11b0bacd VB |
117 | |
118 | return 0; | |
119 | } | |
120 | ||
9b744942 | 121 | static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) |
11b0bacd | 122 | { |
ec2a5652 | 123 | struct fixed_mdio_bus *fmb = bus->priv; |
a79d8e93 VB |
124 | struct fixed_phy *fp; |
125 | ||
126 | if (reg_num >= MII_REGS_NUM) | |
127 | return -1; | |
128 | ||
a2dbba76 FF |
129 | /* We do not support emulating Clause 45 over Clause 22 register reads |
130 | * return an error instead of bogus data. | |
131 | */ | |
132 | switch (reg_num) { | |
133 | case MII_MMD_CTRL: | |
134 | case MII_MMD_DATA: | |
135 | return -1; | |
136 | default: | |
137 | break; | |
138 | } | |
139 | ||
a79d8e93 | 140 | list_for_each_entry(fp, &fmb->phys, node) { |
9b744942 | 141 | if (fp->addr == phy_addr) { |
a79d8e93 VB |
142 | /* Issue callback if user registered it. */ |
143 | if (fp->link_update) { | |
144 | fp->link_update(fp->phydev->attached_dev, | |
145 | &fp->status); | |
146 | fixed_phy_update_regs(fp); | |
11b0bacd | 147 | } |
a79d8e93 | 148 | return fp->regs[reg_num]; |
7c32f470 | 149 | } |
a79d8e93 | 150 | } |
11b0bacd | 151 | |
a79d8e93 | 152 | return 0xFFFF; |
11b0bacd VB |
153 | } |
154 | ||
9b744942 | 155 | static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, |
a79d8e93 | 156 | u16 val) |
11b0bacd | 157 | { |
11b0bacd VB |
158 | return 0; |
159 | } | |
160 | ||
a79d8e93 VB |
161 | /* |
162 | * If something weird is required to be done with link/speed, | |
163 | * network driver is able to assign a function to implement this. | |
164 | * May be useful for PHY's that need to be software-driven. | |
165 | */ | |
166 | int fixed_phy_set_link_update(struct phy_device *phydev, | |
167 | int (*link_update)(struct net_device *, | |
168 | struct fixed_phy_status *)) | |
11b0bacd | 169 | { |
a79d8e93 VB |
170 | struct fixed_mdio_bus *fmb = &platform_fmb; |
171 | struct fixed_phy *fp; | |
11b0bacd | 172 | |
799d4444 | 173 | if (!phydev || !phydev->bus) |
a79d8e93 | 174 | return -EINVAL; |
11b0bacd | 175 | |
a79d8e93 | 176 | list_for_each_entry(fp, &fmb->phys, node) { |
9b744942 | 177 | if (fp->addr == phydev->addr) { |
a79d8e93 VB |
178 | fp->link_update = link_update; |
179 | fp->phydev = phydev; | |
180 | return 0; | |
181 | } | |
182 | } | |
11b0bacd | 183 | |
a79d8e93 | 184 | return -ENOENT; |
7c32f470 | 185 | } |
a79d8e93 | 186 | EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); |
7c32f470 | 187 | |
a3bebdce SS |
188 | int fixed_phy_update_state(struct phy_device *phydev, |
189 | const struct fixed_phy_status *status, | |
190 | const struct fixed_phy_status *changed) | |
191 | { | |
192 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
193 | struct fixed_phy *fp; | |
194 | ||
195 | if (!phydev || !phydev->bus) | |
196 | return -EINVAL; | |
197 | ||
198 | list_for_each_entry(fp, &fmb->phys, node) { | |
199 | if (fp->addr == phydev->addr) { | |
200 | #define _UPD(x) if (changed->x) \ | |
201 | fp->status.x = status->x | |
202 | _UPD(link); | |
203 | _UPD(speed); | |
204 | _UPD(duplex); | |
205 | _UPD(pause); | |
206 | _UPD(asym_pause); | |
207 | #undef _UPD | |
208 | fixed_phy_update_regs(fp); | |
209 | return 0; | |
210 | } | |
211 | } | |
212 | ||
213 | return -ENOENT; | |
214 | } | |
215 | EXPORT_SYMBOL(fixed_phy_update_state); | |
216 | ||
9b744942 | 217 | int fixed_phy_add(unsigned int irq, int phy_addr, |
a79d8e93 | 218 | struct fixed_phy_status *status) |
11b0bacd | 219 | { |
a79d8e93 VB |
220 | int ret; |
221 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
222 | struct fixed_phy *fp; | |
11b0bacd | 223 | |
a79d8e93 VB |
224 | fp = kzalloc(sizeof(*fp), GFP_KERNEL); |
225 | if (!fp) | |
226 | return -ENOMEM; | |
11b0bacd | 227 | |
a79d8e93 | 228 | memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); |
11b0bacd | 229 | |
9b744942 | 230 | fmb->irqs[phy_addr] = irq; |
11b0bacd | 231 | |
9b744942 | 232 | fp->addr = phy_addr; |
a79d8e93 | 233 | fp->status = *status; |
7c32f470 | 234 | |
a79d8e93 VB |
235 | ret = fixed_phy_update_regs(fp); |
236 | if (ret) | |
237 | goto err_regs; | |
11b0bacd | 238 | |
a79d8e93 | 239 | list_add_tail(&fp->node, &fmb->phys); |
7c32f470 | 240 | |
a79d8e93 | 241 | return 0; |
11b0bacd | 242 | |
a79d8e93 VB |
243 | err_regs: |
244 | kfree(fp); | |
245 | return ret; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(fixed_phy_add); | |
11b0bacd | 248 | |
a7595121 TP |
249 | void fixed_phy_del(int phy_addr) |
250 | { | |
251 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
252 | struct fixed_phy *fp, *tmp; | |
253 | ||
254 | list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { | |
255 | if (fp->addr == phy_addr) { | |
256 | list_del(&fp->node); | |
257 | kfree(fp); | |
258 | return; | |
259 | } | |
260 | } | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(fixed_phy_del); | |
263 | ||
264 | static int phy_fixed_addr; | |
265 | static DEFINE_SPINLOCK(phy_fixed_addr_lock); | |
266 | ||
fd2ef0ba PG |
267 | struct phy_device *fixed_phy_register(unsigned int irq, |
268 | struct fixed_phy_status *status, | |
269 | struct device_node *np) | |
a7595121 TP |
270 | { |
271 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
272 | struct phy_device *phy; | |
273 | int phy_addr; | |
274 | int ret; | |
275 | ||
276 | /* Get the next available PHY address, up to PHY_MAX_ADDR */ | |
277 | spin_lock(&phy_fixed_addr_lock); | |
278 | if (phy_fixed_addr == PHY_MAX_ADDR) { | |
279 | spin_unlock(&phy_fixed_addr_lock); | |
fd2ef0ba | 280 | return ERR_PTR(-ENOSPC); |
a7595121 TP |
281 | } |
282 | phy_addr = phy_fixed_addr++; | |
283 | spin_unlock(&phy_fixed_addr_lock); | |
284 | ||
285 | ret = fixed_phy_add(PHY_POLL, phy_addr, status); | |
286 | if (ret < 0) | |
fd2ef0ba | 287 | return ERR_PTR(ret); |
a7595121 TP |
288 | |
289 | phy = get_phy_device(fmb->mii_bus, phy_addr, false); | |
290 | if (!phy || IS_ERR(phy)) { | |
291 | fixed_phy_del(phy_addr); | |
fd2ef0ba | 292 | return ERR_PTR(-EINVAL); |
a7595121 TP |
293 | } |
294 | ||
4b195360 MB |
295 | /* propagate the fixed link values to struct phy_device */ |
296 | phy->link = status->link; | |
297 | if (status->link) { | |
298 | phy->speed = status->speed; | |
299 | phy->duplex = status->duplex; | |
300 | phy->pause = status->pause; | |
301 | phy->asym_pause = status->asym_pause; | |
302 | } | |
303 | ||
a7595121 TP |
304 | of_node_get(np); |
305 | phy->dev.of_node = np; | |
5a11dd7d | 306 | phy->is_pseudo_fixed_link = true; |
a7595121 TP |
307 | |
308 | ret = phy_device_register(phy); | |
309 | if (ret) { | |
310 | phy_device_free(phy); | |
311 | of_node_put(np); | |
312 | fixed_phy_del(phy_addr); | |
fd2ef0ba | 313 | return ERR_PTR(ret); |
a7595121 TP |
314 | } |
315 | ||
fd2ef0ba | 316 | return phy; |
a7595121 | 317 | } |
37e9a690 | 318 | EXPORT_SYMBOL_GPL(fixed_phy_register); |
a7595121 | 319 | |
a79d8e93 VB |
320 | static int __init fixed_mdio_bus_init(void) |
321 | { | |
322 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
323 | int ret; | |
11b0bacd | 324 | |
a79d8e93 | 325 | pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); |
57401d5e DC |
326 | if (IS_ERR(pdev)) { |
327 | ret = PTR_ERR(pdev); | |
a79d8e93 VB |
328 | goto err_pdev; |
329 | } | |
11b0bacd | 330 | |
298cf9be LB |
331 | fmb->mii_bus = mdiobus_alloc(); |
332 | if (fmb->mii_bus == NULL) { | |
333 | ret = -ENOMEM; | |
334 | goto err_mdiobus_reg; | |
335 | } | |
11b0bacd | 336 | |
9e6c643b | 337 | snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); |
298cf9be | 338 | fmb->mii_bus->name = "Fixed MDIO Bus"; |
ec2a5652 | 339 | fmb->mii_bus->priv = fmb; |
298cf9be LB |
340 | fmb->mii_bus->parent = &pdev->dev; |
341 | fmb->mii_bus->read = &fixed_mdio_read; | |
342 | fmb->mii_bus->write = &fixed_mdio_write; | |
343 | fmb->mii_bus->irq = fmb->irqs; | |
344 | ||
345 | ret = mdiobus_register(fmb->mii_bus); | |
a79d8e93 | 346 | if (ret) |
298cf9be | 347 | goto err_mdiobus_alloc; |
11b0bacd | 348 | |
a79d8e93 | 349 | return 0; |
11b0bacd | 350 | |
298cf9be LB |
351 | err_mdiobus_alloc: |
352 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 VB |
353 | err_mdiobus_reg: |
354 | platform_device_unregister(pdev); | |
355 | err_pdev: | |
356 | return ret; | |
357 | } | |
358 | module_init(fixed_mdio_bus_init); | |
11b0bacd | 359 | |
a79d8e93 VB |
360 | static void __exit fixed_mdio_bus_exit(void) |
361 | { | |
362 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
651be3a2 | 363 | struct fixed_phy *fp, *tmp; |
11b0bacd | 364 | |
298cf9be LB |
365 | mdiobus_unregister(fmb->mii_bus); |
366 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 | 367 | platform_device_unregister(pdev); |
11b0bacd | 368 | |
651be3a2 | 369 | list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { |
a79d8e93 VB |
370 | list_del(&fp->node); |
371 | kfree(fp); | |
7c32f470 | 372 | } |
11b0bacd | 373 | } |
a79d8e93 | 374 | module_exit(fixed_mdio_bus_exit); |
11b0bacd | 375 | |
a79d8e93 | 376 | MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); |
11b0bacd VB |
377 | MODULE_AUTHOR("Vitaly Bordug"); |
378 | MODULE_LICENSE("GPL"); |