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> |
a5597008 | 25 | #include <linux/gpio.h> |
11b0bacd | 26 | |
a79d8e93 | 27 | #define MII_REGS_NUM 29 |
11b0bacd | 28 | |
a79d8e93 | 29 | struct fixed_mdio_bus { |
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; | |
a5597008 | 41 | int link_gpio; |
a79d8e93 | 42 | }; |
7c32f470 | 43 | |
a79d8e93 VB |
44 | static struct platform_device *pdev; |
45 | static struct fixed_mdio_bus platform_fmb = { | |
46 | .phys = LIST_HEAD_INIT(platform_fmb.phys), | |
47 | }; | |
7c32f470 | 48 | |
a79d8e93 | 49 | static int fixed_phy_update_regs(struct fixed_phy *fp) |
11b0bacd | 50 | { |
a79d8e93 | 51 | u16 bmsr = BMSR_ANEGCAPABLE; |
11b0bacd | 52 | u16 bmcr = 0; |
a79d8e93 VB |
53 | u16 lpagb = 0; |
54 | u16 lpa = 0; | |
11b0bacd | 55 | |
a5597008 AL |
56 | if (gpio_is_valid(fp->link_gpio)) |
57 | fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio); | |
58 | ||
a79d8e93 | 59 | if (fp->status.duplex) { |
a79d8e93 VB |
60 | switch (fp->status.speed) { |
61 | case 1000: | |
62 | bmsr |= BMSR_ESTATEN; | |
a79d8e93 | 63 | break; |
11b0bacd VB |
64 | case 100: |
65 | bmsr |= BMSR_100FULL; | |
7c32f470 | 66 | break; |
11b0bacd VB |
67 | case 10: |
68 | bmsr |= BMSR_10FULL; | |
7c32f470 | 69 | break; |
a79d8e93 | 70 | default: |
bc0f4a87 | 71 | break; |
11b0bacd VB |
72 | } |
73 | } else { | |
a79d8e93 VB |
74 | switch (fp->status.speed) { |
75 | case 1000: | |
76 | bmsr |= BMSR_ESTATEN; | |
a79d8e93 | 77 | break; |
11b0bacd VB |
78 | case 100: |
79 | bmsr |= BMSR_100HALF; | |
7c32f470 | 80 | break; |
11b0bacd | 81 | case 10: |
a79d8e93 | 82 | bmsr |= BMSR_10HALF; |
7c32f470 | 83 | break; |
a79d8e93 | 84 | default: |
bc0f4a87 | 85 | break; |
11b0bacd VB |
86 | } |
87 | } | |
88 | ||
bc0f4a87 AL |
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 | } | |
a79d8e93 | 129 | |
bc0f4a87 AL |
130 | if (fp->status.pause) |
131 | lpa |= LPA_PAUSE_CAP; | |
132 | ||
133 | if (fp->status.asym_pause) | |
134 | lpa |= LPA_PAUSE_ASYM; | |
135 | } | |
a79d8e93 | 136 | |
9b744942 TP |
137 | fp->regs[MII_PHYSID1] = 0; |
138 | fp->regs[MII_PHYSID2] = 0; | |
a79d8e93 VB |
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; | |
11b0bacd VB |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
9b744942 | 148 | static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num) |
11b0bacd | 149 | { |
ec2a5652 | 150 | struct fixed_mdio_bus *fmb = bus->priv; |
a79d8e93 VB |
151 | struct fixed_phy *fp; |
152 | ||
153 | if (reg_num >= MII_REGS_NUM) | |
154 | return -1; | |
155 | ||
a2dbba76 FF |
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 | ||
a79d8e93 | 167 | list_for_each_entry(fp, &fmb->phys, node) { |
9b744942 | 168 | if (fp->addr == phy_addr) { |
a79d8e93 VB |
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); | |
11b0bacd | 174 | } |
a79d8e93 | 175 | return fp->regs[reg_num]; |
7c32f470 | 176 | } |
a79d8e93 | 177 | } |
11b0bacd | 178 | |
a79d8e93 | 179 | return 0xFFFF; |
11b0bacd VB |
180 | } |
181 | ||
9b744942 | 182 | static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num, |
a79d8e93 | 183 | u16 val) |
11b0bacd | 184 | { |
11b0bacd VB |
185 | return 0; |
186 | } | |
187 | ||
a79d8e93 VB |
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 | */ | |
193 | int fixed_phy_set_link_update(struct phy_device *phydev, | |
194 | int (*link_update)(struct net_device *, | |
195 | struct fixed_phy_status *)) | |
11b0bacd | 196 | { |
a79d8e93 VB |
197 | struct fixed_mdio_bus *fmb = &platform_fmb; |
198 | struct fixed_phy *fp; | |
11b0bacd | 199 | |
e5a03bfd | 200 | if (!phydev || !phydev->mdio.bus) |
a79d8e93 | 201 | return -EINVAL; |
11b0bacd | 202 | |
a79d8e93 | 203 | list_for_each_entry(fp, &fmb->phys, node) { |
e5a03bfd | 204 | if (fp->addr == phydev->mdio.addr) { |
a79d8e93 VB |
205 | fp->link_update = link_update; |
206 | fp->phydev = phydev; | |
207 | return 0; | |
208 | } | |
209 | } | |
11b0bacd | 210 | |
a79d8e93 | 211 | return -ENOENT; |
7c32f470 | 212 | } |
a79d8e93 | 213 | EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); |
7c32f470 | 214 | |
a3bebdce SS |
215 | int 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 | ||
e5a03bfd | 222 | if (!phydev || phydev->mdio.bus != fmb->mii_bus) |
a3bebdce SS |
223 | return -EINVAL; |
224 | ||
225 | list_for_each_entry(fp, &fmb->phys, node) { | |
e5a03bfd | 226 | if (fp->addr == phydev->mdio.addr) { |
a3bebdce SS |
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 | } | |
242 | EXPORT_SYMBOL(fixed_phy_update_state); | |
243 | ||
9b744942 | 244 | int fixed_phy_add(unsigned int irq, int phy_addr, |
a5597008 AL |
245 | struct fixed_phy_status *status, |
246 | int link_gpio) | |
11b0bacd | 247 | { |
a79d8e93 VB |
248 | int ret; |
249 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
250 | struct fixed_phy *fp; | |
11b0bacd | 251 | |
a79d8e93 VB |
252 | fp = kzalloc(sizeof(*fp), GFP_KERNEL); |
253 | if (!fp) | |
254 | return -ENOMEM; | |
11b0bacd | 255 | |
a79d8e93 | 256 | memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); |
11b0bacd | 257 | |
185be5ae RV |
258 | if (irq != PHY_POLL) |
259 | fmb->mii_bus->irq[phy_addr] = irq; | |
11b0bacd | 260 | |
9b744942 | 261 | fp->addr = phy_addr; |
a79d8e93 | 262 | fp->status = *status; |
a5597008 AL |
263 | fp->link_gpio = link_gpio; |
264 | ||
265 | if (gpio_is_valid(fp->link_gpio)) { | |
266 | ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN, | |
267 | "fixed-link-gpio-link"); | |
268 | if (ret) | |
269 | goto err_regs; | |
270 | } | |
7c32f470 | 271 | |
a79d8e93 VB |
272 | ret = fixed_phy_update_regs(fp); |
273 | if (ret) | |
a5597008 | 274 | goto err_gpio; |
11b0bacd | 275 | |
a79d8e93 | 276 | list_add_tail(&fp->node, &fmb->phys); |
7c32f470 | 277 | |
a79d8e93 | 278 | return 0; |
11b0bacd | 279 | |
a5597008 AL |
280 | err_gpio: |
281 | if (gpio_is_valid(fp->link_gpio)) | |
282 | gpio_free(fp->link_gpio); | |
a79d8e93 VB |
283 | err_regs: |
284 | kfree(fp); | |
285 | return ret; | |
286 | } | |
287 | EXPORT_SYMBOL_GPL(fixed_phy_add); | |
11b0bacd | 288 | |
5bcbe0f3 | 289 | static void fixed_phy_del(int phy_addr) |
a7595121 TP |
290 | { |
291 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
292 | struct fixed_phy *fp, *tmp; | |
293 | ||
294 | list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { | |
295 | if (fp->addr == phy_addr) { | |
296 | list_del(&fp->node); | |
a5597008 AL |
297 | if (gpio_is_valid(fp->link_gpio)) |
298 | gpio_free(fp->link_gpio); | |
a7595121 TP |
299 | kfree(fp); |
300 | return; | |
301 | } | |
302 | } | |
303 | } | |
a7595121 TP |
304 | |
305 | static int phy_fixed_addr; | |
306 | static DEFINE_SPINLOCK(phy_fixed_addr_lock); | |
307 | ||
fd2ef0ba PG |
308 | struct phy_device *fixed_phy_register(unsigned int irq, |
309 | struct fixed_phy_status *status, | |
a5597008 | 310 | int link_gpio, |
fd2ef0ba | 311 | struct device_node *np) |
a7595121 TP |
312 | { |
313 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
314 | struct phy_device *phy; | |
315 | int phy_addr; | |
316 | int ret; | |
317 | ||
185be5ae RV |
318 | if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED) |
319 | return ERR_PTR(-EPROBE_DEFER); | |
320 | ||
a7595121 TP |
321 | /* Get the next available PHY address, up to PHY_MAX_ADDR */ |
322 | spin_lock(&phy_fixed_addr_lock); | |
323 | if (phy_fixed_addr == PHY_MAX_ADDR) { | |
324 | spin_unlock(&phy_fixed_addr_lock); | |
fd2ef0ba | 325 | return ERR_PTR(-ENOSPC); |
a7595121 TP |
326 | } |
327 | phy_addr = phy_fixed_addr++; | |
328 | spin_unlock(&phy_fixed_addr_lock); | |
329 | ||
bd1a05ee | 330 | ret = fixed_phy_add(irq, phy_addr, status, link_gpio); |
a7595121 | 331 | if (ret < 0) |
fd2ef0ba | 332 | return ERR_PTR(ret); |
a7595121 TP |
333 | |
334 | phy = get_phy_device(fmb->mii_bus, phy_addr, false); | |
4914a584 | 335 | if (IS_ERR(phy)) { |
a7595121 | 336 | fixed_phy_del(phy_addr); |
fd2ef0ba | 337 | return ERR_PTR(-EINVAL); |
a7595121 TP |
338 | } |
339 | ||
4b195360 MB |
340 | /* propagate the fixed link values to struct phy_device */ |
341 | phy->link = status->link; | |
342 | if (status->link) { | |
343 | phy->speed = status->speed; | |
344 | phy->duplex = status->duplex; | |
345 | phy->pause = status->pause; | |
346 | phy->asym_pause = status->asym_pause; | |
347 | } | |
348 | ||
a7595121 | 349 | of_node_get(np); |
e5a03bfd | 350 | phy->mdio.dev.of_node = np; |
5a11dd7d | 351 | phy->is_pseudo_fixed_link = true; |
a7595121 | 352 | |
34b31da4 AL |
353 | switch (status->speed) { |
354 | case SPEED_1000: | |
355 | phy->supported = PHY_1000BT_FEATURES; | |
356 | break; | |
357 | case SPEED_100: | |
358 | phy->supported = PHY_100BT_FEATURES; | |
359 | break; | |
360 | case SPEED_10: | |
361 | default: | |
362 | phy->supported = PHY_10BT_FEATURES; | |
363 | } | |
364 | ||
a7595121 TP |
365 | ret = phy_device_register(phy); |
366 | if (ret) { | |
367 | phy_device_free(phy); | |
368 | of_node_put(np); | |
369 | fixed_phy_del(phy_addr); | |
fd2ef0ba | 370 | return ERR_PTR(ret); |
a7595121 TP |
371 | } |
372 | ||
fd2ef0ba | 373 | return phy; |
a7595121 | 374 | } |
37e9a690 | 375 | EXPORT_SYMBOL_GPL(fixed_phy_register); |
a7595121 | 376 | |
5bcbe0f3 AL |
377 | void fixed_phy_unregister(struct phy_device *phy) |
378 | { | |
379 | phy_device_remove(phy); | |
380 | ||
381 | fixed_phy_del(phy->mdio.addr); | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(fixed_phy_unregister); | |
384 | ||
a79d8e93 VB |
385 | static int __init fixed_mdio_bus_init(void) |
386 | { | |
387 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
388 | int ret; | |
11b0bacd | 389 | |
a79d8e93 | 390 | pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); |
57401d5e DC |
391 | if (IS_ERR(pdev)) { |
392 | ret = PTR_ERR(pdev); | |
a79d8e93 VB |
393 | goto err_pdev; |
394 | } | |
11b0bacd | 395 | |
298cf9be LB |
396 | fmb->mii_bus = mdiobus_alloc(); |
397 | if (fmb->mii_bus == NULL) { | |
398 | ret = -ENOMEM; | |
399 | goto err_mdiobus_reg; | |
400 | } | |
11b0bacd | 401 | |
9e6c643b | 402 | snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0"); |
298cf9be | 403 | fmb->mii_bus->name = "Fixed MDIO Bus"; |
ec2a5652 | 404 | fmb->mii_bus->priv = fmb; |
298cf9be LB |
405 | fmb->mii_bus->parent = &pdev->dev; |
406 | fmb->mii_bus->read = &fixed_mdio_read; | |
407 | fmb->mii_bus->write = &fixed_mdio_write; | |
298cf9be LB |
408 | |
409 | ret = mdiobus_register(fmb->mii_bus); | |
a79d8e93 | 410 | if (ret) |
298cf9be | 411 | goto err_mdiobus_alloc; |
11b0bacd | 412 | |
a79d8e93 | 413 | return 0; |
11b0bacd | 414 | |
298cf9be LB |
415 | err_mdiobus_alloc: |
416 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 VB |
417 | err_mdiobus_reg: |
418 | platform_device_unregister(pdev); | |
419 | err_pdev: | |
420 | return ret; | |
421 | } | |
422 | module_init(fixed_mdio_bus_init); | |
11b0bacd | 423 | |
a79d8e93 VB |
424 | static void __exit fixed_mdio_bus_exit(void) |
425 | { | |
426 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
651be3a2 | 427 | struct fixed_phy *fp, *tmp; |
11b0bacd | 428 | |
298cf9be LB |
429 | mdiobus_unregister(fmb->mii_bus); |
430 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 | 431 | platform_device_unregister(pdev); |
11b0bacd | 432 | |
651be3a2 | 433 | list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { |
a79d8e93 VB |
434 | list_del(&fp->node); |
435 | kfree(fp); | |
7c32f470 | 436 | } |
11b0bacd | 437 | } |
a79d8e93 | 438 | module_exit(fixed_mdio_bus_exit); |
11b0bacd | 439 | |
a79d8e93 | 440 | MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); |
11b0bacd VB |
441 | MODULE_AUTHOR("Vitaly Bordug"); |
442 | MODULE_LICENSE("GPL"); |