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[karo-tx-linux.git] / drivers / net / ethernet / broadcom / genet / bcmmii.c
1 /*
2  * Broadcom GENET MDIO routines
3  *
4  * Copyright (c) 2014 Broadcom Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11
12 #include <linux/types.h>
13 #include <linux/delay.h>
14 #include <linux/wait.h>
15 #include <linux/mii.h>
16 #include <linux/ethtool.h>
17 #include <linux/bitops.h>
18 #include <linux/netdevice.h>
19 #include <linux/platform_device.h>
20 #include <linux/phy.h>
21 #include <linux/phy_fixed.h>
22 #include <linux/brcmphy.h>
23 #include <linux/of.h>
24 #include <linux/of_net.h>
25 #include <linux/of_mdio.h>
26 #include <linux/platform_data/bcmgenet.h>
27
28 #include "bcmgenet.h"
29
30 /* read a value from the MII */
31 static int bcmgenet_mii_read(struct mii_bus *bus, int phy_id, int location)
32 {
33         int ret;
34         struct net_device *dev = bus->priv;
35         struct bcmgenet_priv *priv = netdev_priv(dev);
36         u32 reg;
37
38         bcmgenet_umac_writel(priv, (MDIO_RD | (phy_id << MDIO_PMD_SHIFT) |
39                              (location << MDIO_REG_SHIFT)), UMAC_MDIO_CMD);
40         /* Start MDIO transaction*/
41         reg = bcmgenet_umac_readl(priv, UMAC_MDIO_CMD);
42         reg |= MDIO_START_BUSY;
43         bcmgenet_umac_writel(priv, reg, UMAC_MDIO_CMD);
44         wait_event_timeout(priv->wq,
45                            !(bcmgenet_umac_readl(priv, UMAC_MDIO_CMD)
46                            & MDIO_START_BUSY),
47                            HZ / 100);
48         ret = bcmgenet_umac_readl(priv, UMAC_MDIO_CMD);
49
50         /* Some broken devices are known not to release the line during
51          * turn-around, e.g: Broadcom BCM53125 external switches, so check for
52          * that condition here and ignore the MDIO controller read failure
53          * indication.
54          */
55         if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (ret & MDIO_READ_FAIL))
56                 return -EIO;
57
58         return ret & 0xffff;
59 }
60
61 /* write a value to the MII */
62 static int bcmgenet_mii_write(struct mii_bus *bus, int phy_id,
63                               int location, u16 val)
64 {
65         struct net_device *dev = bus->priv;
66         struct bcmgenet_priv *priv = netdev_priv(dev);
67         u32 reg;
68
69         bcmgenet_umac_writel(priv, (MDIO_WR | (phy_id << MDIO_PMD_SHIFT) |
70                              (location << MDIO_REG_SHIFT) | (0xffff & val)),
71                              UMAC_MDIO_CMD);
72         reg = bcmgenet_umac_readl(priv, UMAC_MDIO_CMD);
73         reg |= MDIO_START_BUSY;
74         bcmgenet_umac_writel(priv, reg, UMAC_MDIO_CMD);
75         wait_event_timeout(priv->wq,
76                            !(bcmgenet_umac_readl(priv, UMAC_MDIO_CMD) &
77                            MDIO_START_BUSY),
78                            HZ / 100);
79
80         return 0;
81 }
82
83 /* setup netdev link state when PHY link status change and
84  * update UMAC and RGMII block when link up
85  */
86 void bcmgenet_mii_setup(struct net_device *dev)
87 {
88         struct bcmgenet_priv *priv = netdev_priv(dev);
89         struct phy_device *phydev = priv->phydev;
90         u32 reg, cmd_bits = 0;
91         bool status_changed = false;
92
93         if (priv->old_link != phydev->link) {
94                 status_changed = true;
95                 priv->old_link = phydev->link;
96         }
97
98         if (phydev->link) {
99                 /* check speed/duplex/pause changes */
100                 if (priv->old_speed != phydev->speed) {
101                         status_changed = true;
102                         priv->old_speed = phydev->speed;
103                 }
104
105                 if (priv->old_duplex != phydev->duplex) {
106                         status_changed = true;
107                         priv->old_duplex = phydev->duplex;
108                 }
109
110                 if (priv->old_pause != phydev->pause) {
111                         status_changed = true;
112                         priv->old_pause = phydev->pause;
113                 }
114
115                 /* done if nothing has changed */
116                 if (!status_changed)
117                         return;
118
119                 /* speed */
120                 if (phydev->speed == SPEED_1000)
121                         cmd_bits = UMAC_SPEED_1000;
122                 else if (phydev->speed == SPEED_100)
123                         cmd_bits = UMAC_SPEED_100;
124                 else
125                         cmd_bits = UMAC_SPEED_10;
126                 cmd_bits <<= CMD_SPEED_SHIFT;
127
128                 /* duplex */
129                 if (phydev->duplex != DUPLEX_FULL)
130                         cmd_bits |= CMD_HD_EN;
131
132                 /* pause capability */
133                 if (!phydev->pause)
134                         cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
135
136                 /*
137                  * Program UMAC and RGMII block based on established
138                  * link speed, duplex, and pause. The speed set in
139                  * umac->cmd tell RGMII block which clock to use for
140                  * transmit -- 25MHz(100Mbps) or 125MHz(1Gbps).
141                  * Receive clock is provided by the PHY.
142                  */
143                 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
144                 reg &= ~OOB_DISABLE;
145                 reg |= RGMII_LINK;
146                 bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
147
148                 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
149                 reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
150                                CMD_HD_EN |
151                                CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE);
152                 reg |= cmd_bits;
153                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
154         } else {
155                 /* done if nothing has changed */
156                 if (!status_changed)
157                         return;
158
159                 /* needed for MoCA fixed PHY to reflect correct link status */
160                 netif_carrier_off(dev);
161         }
162
163         phy_print_status(phydev);
164 }
165
166
167 static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
168                                           struct fixed_phy_status *status)
169 {
170         if (dev && dev->phydev && status)
171                 status->link = dev->phydev->link;
172
173         return 0;
174 }
175
176 /* Perform a voluntary PHY software reset, since the EPHY is very finicky about
177  * not doing it and will start corrupting packets
178  */
179 void bcmgenet_mii_reset(struct net_device *dev)
180 {
181         struct bcmgenet_priv *priv = netdev_priv(dev);
182
183         if (GENET_IS_V4(priv))
184                 return;
185
186         if (priv->phydev) {
187                 phy_init_hw(priv->phydev);
188                 phy_start_aneg(priv->phydev);
189         }
190 }
191
192 void bcmgenet_phy_power_set(struct net_device *dev, bool enable)
193 {
194         struct bcmgenet_priv *priv = netdev_priv(dev);
195         u32 reg = 0;
196
197         /* EXT_GPHY_CTRL is only valid for GENETv4 and onward */
198         if (!GENET_IS_V4(priv))
199                 return;
200
201         reg = bcmgenet_ext_readl(priv, EXT_GPHY_CTRL);
202         if (enable) {
203                 reg &= ~EXT_CK25_DIS;
204                 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
205                 mdelay(1);
206
207                 reg &= ~(EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN);
208                 reg |= EXT_GPHY_RESET;
209                 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
210                 mdelay(1);
211
212                 reg &= ~EXT_GPHY_RESET;
213         } else {
214                 reg |= EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN | EXT_GPHY_RESET;
215                 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
216                 mdelay(1);
217                 reg |= EXT_CK25_DIS;
218         }
219         bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
220         udelay(60);
221 }
222
223 static void bcmgenet_internal_phy_setup(struct net_device *dev)
224 {
225         struct bcmgenet_priv *priv = netdev_priv(dev);
226         u32 reg;
227
228         /* Power up PHY */
229         bcmgenet_phy_power_set(dev, true);
230         /* enable APD */
231         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
232         reg |= EXT_PWR_DN_EN_LD;
233         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
234         bcmgenet_mii_reset(dev);
235 }
236
237 static void bcmgenet_moca_phy_setup(struct bcmgenet_priv *priv)
238 {
239         u32 reg;
240
241         /* Speed settings are set in bcmgenet_mii_setup() */
242         reg = bcmgenet_sys_readl(priv, SYS_PORT_CTRL);
243         reg |= LED_ACT_SOURCE_MAC;
244         bcmgenet_sys_writel(priv, reg, SYS_PORT_CTRL);
245
246         if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
247                 fixed_phy_set_link_update(priv->phydev,
248                                           bcmgenet_fixed_phy_link_update);
249 }
250
251 int bcmgenet_mii_config(struct net_device *dev)
252 {
253         struct bcmgenet_priv *priv = netdev_priv(dev);
254         struct phy_device *phydev = priv->phydev;
255         struct device *kdev = &priv->pdev->dev;
256         const char *phy_name = NULL;
257         u32 id_mode_dis = 0;
258         u32 port_ctrl;
259         u32 reg;
260
261         priv->ext_phy = !priv->internal_phy &&
262                         (priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
263
264         if (priv->internal_phy)
265                 priv->phy_interface = PHY_INTERFACE_MODE_NA;
266
267         switch (priv->phy_interface) {
268         case PHY_INTERFACE_MODE_NA:
269         case PHY_INTERFACE_MODE_MOCA:
270                 /* Irrespective of the actually configured PHY speed (100 or
271                  * 1000) GENETv4 only has an internal GPHY so we will just end
272                  * up masking the Gigabit features from what we support, not
273                  * switching to the EPHY
274                  */
275                 if (GENET_IS_V4(priv))
276                         port_ctrl = PORT_MODE_INT_GPHY;
277                 else
278                         port_ctrl = PORT_MODE_INT_EPHY;
279
280                 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
281
282                 if (priv->internal_phy) {
283                         phy_name = "internal PHY";
284                         bcmgenet_internal_phy_setup(dev);
285                 } else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
286                         phy_name = "MoCA";
287                         bcmgenet_moca_phy_setup(priv);
288                 }
289                 break;
290
291         case PHY_INTERFACE_MODE_MII:
292                 phy_name = "external MII";
293                 phydev->supported &= PHY_BASIC_FEATURES;
294                 bcmgenet_sys_writel(priv,
295                                     PORT_MODE_EXT_EPHY, SYS_PORT_CTRL);
296                 break;
297
298         case PHY_INTERFACE_MODE_REVMII:
299                 phy_name = "external RvMII";
300                 /* of_mdiobus_register took care of reading the 'max-speed'
301                  * PHY property for us, effectively limiting the PHY supported
302                  * capabilities, use that knowledge to also configure the
303                  * Reverse MII interface correctly.
304                  */
305                 if ((priv->phydev->supported & PHY_BASIC_FEATURES) ==
306                                 PHY_BASIC_FEATURES)
307                         port_ctrl = PORT_MODE_EXT_RVMII_25;
308                 else
309                         port_ctrl = PORT_MODE_EXT_RVMII_50;
310                 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
311                 break;
312
313         case PHY_INTERFACE_MODE_RGMII:
314                 /* RGMII_NO_ID: TXC transitions at the same time as TXD
315                  *              (requires PCB or receiver-side delay)
316                  * RGMII:       Add 2ns delay on TXC (90 degree shift)
317                  *
318                  * ID is implicitly disabled for 100Mbps (RG)MII operation.
319                  */
320                 id_mode_dis = BIT(16);
321                 /* fall through */
322         case PHY_INTERFACE_MODE_RGMII_TXID:
323                 if (id_mode_dis)
324                         phy_name = "external RGMII (no delay)";
325                 else
326                         phy_name = "external RGMII (TX delay)";
327                 bcmgenet_sys_writel(priv,
328                                     PORT_MODE_EXT_GPHY, SYS_PORT_CTRL);
329                 break;
330         default:
331                 dev_err(kdev, "unknown phy mode: %d\n", priv->phy_interface);
332                 return -EINVAL;
333         }
334
335         /* This is an external PHY (xMII), so we need to enable the RGMII
336          * block for the interface to work
337          */
338         if (priv->ext_phy) {
339                 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
340                 reg |= RGMII_MODE_EN | id_mode_dis;
341                 bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
342         }
343
344         dev_info_once(kdev, "configuring instance for %s\n", phy_name);
345
346         return 0;
347 }
348
349 int bcmgenet_mii_probe(struct net_device *dev)
350 {
351         struct bcmgenet_priv *priv = netdev_priv(dev);
352         struct device_node *dn = priv->pdev->dev.of_node;
353         struct phy_device *phydev;
354         u32 phy_flags;
355         int ret;
356
357         /* Communicate the integrated PHY revision */
358         phy_flags = priv->gphy_rev;
359
360         /* Initialize link state variables that bcmgenet_mii_setup() uses */
361         priv->old_link = -1;
362         priv->old_speed = -1;
363         priv->old_duplex = -1;
364         priv->old_pause = -1;
365
366         if (dn) {
367                 phydev = of_phy_connect(dev, priv->phy_dn, bcmgenet_mii_setup,
368                                         phy_flags, priv->phy_interface);
369                 if (!phydev) {
370                         pr_err("could not attach to PHY\n");
371                         return -ENODEV;
372                 }
373         } else {
374                 phydev = priv->phydev;
375                 phydev->dev_flags = phy_flags;
376
377                 ret = phy_connect_direct(dev, phydev, bcmgenet_mii_setup,
378                                          priv->phy_interface);
379                 if (ret) {
380                         pr_err("could not attach to PHY\n");
381                         return -ENODEV;
382                 }
383         }
384
385         priv->phydev = phydev;
386
387         /* Configure port multiplexer based on what the probed PHY device since
388          * reading the 'max-speed' property determines the maximum supported
389          * PHY speed which is needed for bcmgenet_mii_config() to configure
390          * things appropriately.
391          */
392         ret = bcmgenet_mii_config(dev);
393         if (ret) {
394                 phy_disconnect(priv->phydev);
395                 return ret;
396         }
397
398         phydev->advertising = phydev->supported;
399
400         /* The internal PHY has its link interrupts routed to the
401          * Ethernet MAC ISRs
402          */
403         if (priv->internal_phy)
404                 priv->mii_bus->irq[phydev->addr] = PHY_IGNORE_INTERRUPT;
405         else
406                 priv->mii_bus->irq[phydev->addr] = PHY_POLL;
407
408         return 0;
409 }
410
411 /* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with
412  * their internal MDIO management controller making them fail to successfully
413  * be read from or written to for the first transaction.  We insert a dummy
414  * BMSR read here to make sure that phy_get_device() and get_phy_id() can
415  * correctly read the PHY MII_PHYSID1/2 registers and successfully register a
416  * PHY device for this peripheral.
417  *
418  * Once the PHY driver is registered, we can workaround subsequent reads from
419  * there (e.g: during system-wide power management).
420  *
421  * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
422  * therefore the right location to stick that workaround. Since we do not want
423  * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
424  * Device Tree scan to limit the search area.
425  */
426 static int bcmgenet_mii_bus_reset(struct mii_bus *bus)
427 {
428         struct net_device *dev = bus->priv;
429         struct bcmgenet_priv *priv = netdev_priv(dev);
430         struct device_node *np = priv->mdio_dn;
431         struct device_node *child = NULL;
432         u32 read_mask = 0;
433         int addr = 0;
434
435         if (!np) {
436                 read_mask = 1 << priv->phy_addr;
437         } else {
438                 for_each_available_child_of_node(np, child) {
439                         addr = of_mdio_parse_addr(&dev->dev, child);
440                         if (addr < 0)
441                                 continue;
442
443                         read_mask |= 1 << addr;
444                 }
445         }
446
447         for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
448                 if (read_mask & 1 << addr) {
449                         dev_dbg(&dev->dev, "Workaround for PHY @ %d\n", addr);
450                         mdiobus_read(bus, addr, MII_BMSR);
451                 }
452         }
453
454         return 0;
455 }
456
457 static int bcmgenet_mii_alloc(struct bcmgenet_priv *priv)
458 {
459         struct mii_bus *bus;
460
461         if (priv->mii_bus)
462                 return 0;
463
464         priv->mii_bus = mdiobus_alloc();
465         if (!priv->mii_bus) {
466                 pr_err("failed to allocate\n");
467                 return -ENOMEM;
468         }
469
470         bus = priv->mii_bus;
471         bus->priv = priv->dev;
472         bus->name = "bcmgenet MII bus";
473         bus->parent = &priv->pdev->dev;
474         bus->read = bcmgenet_mii_read;
475         bus->write = bcmgenet_mii_write;
476         bus->reset = bcmgenet_mii_bus_reset;
477         snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d",
478                  priv->pdev->name, priv->pdev->id);
479
480         bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
481         if (!bus->irq) {
482                 mdiobus_free(priv->mii_bus);
483                 return -ENOMEM;
484         }
485
486         return 0;
487 }
488
489 static int bcmgenet_mii_of_init(struct bcmgenet_priv *priv)
490 {
491         struct device_node *dn = priv->pdev->dev.of_node;
492         struct device *kdev = &priv->pdev->dev;
493         const char *phy_mode_str = NULL;
494         struct phy_device *phydev = NULL;
495         char *compat;
496         int phy_mode;
497         int ret;
498
499         compat = kasprintf(GFP_KERNEL, "brcm,genet-mdio-v%d", priv->version);
500         if (!compat)
501                 return -ENOMEM;
502
503         priv->mdio_dn = of_find_compatible_node(dn, NULL, compat);
504         kfree(compat);
505         if (!priv->mdio_dn) {
506                 dev_err(kdev, "unable to find MDIO bus node\n");
507                 return -ENODEV;
508         }
509
510         ret = of_mdiobus_register(priv->mii_bus, priv->mdio_dn);
511         if (ret) {
512                 dev_err(kdev, "failed to register MDIO bus\n");
513                 return ret;
514         }
515
516         /* Fetch the PHY phandle */
517         priv->phy_dn = of_parse_phandle(dn, "phy-handle", 0);
518
519         /* In the case of a fixed PHY, the DT node associated
520          * to the PHY is the Ethernet MAC DT node.
521          */
522         if (!priv->phy_dn && of_phy_is_fixed_link(dn)) {
523                 ret = of_phy_register_fixed_link(dn);
524                 if (ret)
525                         return ret;
526
527                 priv->phy_dn = of_node_get(dn);
528         }
529
530         /* Get the link mode */
531         phy_mode = of_get_phy_mode(dn);
532         priv->phy_interface = phy_mode;
533
534         /* We need to specifically look up whether this PHY interface is internal
535          * or not *before* we even try to probe the PHY driver over MDIO as we
536          * may have shut down the internal PHY for power saving purposes.
537          */
538         if (phy_mode < 0) {
539                 ret = of_property_read_string(dn, "phy-mode", &phy_mode_str);
540                 if (ret < 0) {
541                         dev_err(kdev, "invalid PHY mode property\n");
542                         return ret;
543                 }
544
545                 priv->phy_interface = PHY_INTERFACE_MODE_NA;
546                 if (!strcasecmp(phy_mode_str, "internal"))
547                         priv->internal_phy = true;
548         }
549
550         /* Make sure we initialize MoCA PHYs with a link down */
551         if (phy_mode == PHY_INTERFACE_MODE_MOCA) {
552                 phydev = of_phy_find_device(dn);
553                 if (phydev)
554                         phydev->link = 0;
555         }
556
557         return 0;
558 }
559
560 static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
561 {
562         struct device *kdev = &priv->pdev->dev;
563         struct bcmgenet_platform_data *pd = kdev->platform_data;
564         struct mii_bus *mdio = priv->mii_bus;
565         struct phy_device *phydev;
566         int ret;
567
568         if (pd->phy_interface != PHY_INTERFACE_MODE_MOCA && pd->mdio_enabled) {
569                 /*
570                  * Internal or external PHY with MDIO access
571                  */
572                 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
573                         mdio->phy_mask = ~(1 << pd->phy_address);
574                 else
575                         mdio->phy_mask = 0;
576
577                 ret = mdiobus_register(mdio);
578                 if (ret) {
579                         dev_err(kdev, "failed to register MDIO bus\n");
580                         return ret;
581                 }
582
583                 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
584                         phydev = mdio->phy_map[pd->phy_address];
585                 else
586                         phydev = phy_find_first(mdio);
587
588                 if (!phydev) {
589                         dev_err(kdev, "failed to register PHY device\n");
590                         mdiobus_unregister(mdio);
591                         return -ENODEV;
592                 }
593         } else {
594                 /*
595                  * MoCA port or no MDIO access.
596                  * Use fixed PHY to represent the link layer.
597                  */
598                 struct fixed_phy_status fphy_status = {
599                         .link = 1,
600                         .speed = pd->phy_speed,
601                         .duplex = pd->phy_duplex,
602                         .pause = 0,
603                         .asym_pause = 0,
604                 };
605
606                 phydev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
607                 if (!phydev || IS_ERR(phydev)) {
608                         dev_err(kdev, "failed to register fixed PHY device\n");
609                         return -ENODEV;
610                 }
611
612                 /* Make sure we initialize MoCA PHYs with a link down */
613                 phydev->link = 0;
614
615         }
616
617         priv->phydev = phydev;
618         priv->phy_interface = pd->phy_interface;
619
620         return 0;
621 }
622
623 static int bcmgenet_mii_bus_init(struct bcmgenet_priv *priv)
624 {
625         struct device_node *dn = priv->pdev->dev.of_node;
626
627         if (dn)
628                 return bcmgenet_mii_of_init(priv);
629         else
630                 return bcmgenet_mii_pd_init(priv);
631 }
632
633 int bcmgenet_mii_init(struct net_device *dev)
634 {
635         struct bcmgenet_priv *priv = netdev_priv(dev);
636         int ret;
637
638         ret = bcmgenet_mii_alloc(priv);
639         if (ret)
640                 return ret;
641
642         ret = bcmgenet_mii_bus_init(priv);
643         if (ret)
644                 goto out;
645
646         return 0;
647
648 out:
649         of_node_put(priv->phy_dn);
650         mdiobus_unregister(priv->mii_bus);
651         kfree(priv->mii_bus->irq);
652         mdiobus_free(priv->mii_bus);
653         return ret;
654 }
655
656 void bcmgenet_mii_exit(struct net_device *dev)
657 {
658         struct bcmgenet_priv *priv = netdev_priv(dev);
659
660         of_node_put(priv->phy_dn);
661         mdiobus_unregister(priv->mii_bus);
662         kfree(priv->mii_bus->irq);
663         mdiobus_free(priv->mii_bus);
664 }