]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/net/ethernet/broadcom/genet/bcmmii.c
scsi: qedi: Fix return code in qedi_ep_connect()
[karo-tx-linux.git] / drivers / net / ethernet / broadcom / genet / bcmmii.c
1 /*
2  * Broadcom GENET MDIO routines
3  *
4  * Copyright (c) 2014-2017 Broadcom
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                 reg = bcmgenet_ext_readl(priv, EXT_GPHY_CTRL);
200                 if (enable) {
201                         reg &= ~EXT_CK25_DIS;
202                         bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
203                         mdelay(1);
204
205                         reg &= ~(EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN);
206                         reg |= EXT_GPHY_RESET;
207                         bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
208                         mdelay(1);
209
210                         reg &= ~EXT_GPHY_RESET;
211                 } else {
212                         reg |= EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN |
213                                EXT_GPHY_RESET;
214                         bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
215                         mdelay(1);
216                         reg |= EXT_CK25_DIS;
217                 }
218                 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
219                 udelay(60);
220         } else {
221                 mdelay(1);
222         }
223 }
224
225 static void bcmgenet_moca_phy_setup(struct bcmgenet_priv *priv)
226 {
227         u32 reg;
228
229         if (!GENET_IS_V5(priv)) {
230                 /* Speed settings are set in bcmgenet_mii_setup() */
231                 reg = bcmgenet_sys_readl(priv, SYS_PORT_CTRL);
232                 reg |= LED_ACT_SOURCE_MAC;
233                 bcmgenet_sys_writel(priv, reg, SYS_PORT_CTRL);
234         }
235
236         if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
237                 fixed_phy_set_link_update(priv->phydev,
238                                           bcmgenet_fixed_phy_link_update);
239 }
240
241 int bcmgenet_mii_config(struct net_device *dev)
242 {
243         struct bcmgenet_priv *priv = netdev_priv(dev);
244         struct phy_device *phydev = priv->phydev;
245         struct device *kdev = &priv->pdev->dev;
246         const char *phy_name = NULL;
247         u32 id_mode_dis = 0;
248         u32 port_ctrl;
249         u32 reg;
250
251         priv->ext_phy = !priv->internal_phy &&
252                         (priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
253
254         switch (priv->phy_interface) {
255         case PHY_INTERFACE_MODE_INTERNAL:
256         case PHY_INTERFACE_MODE_MOCA:
257                 /* Irrespective of the actually configured PHY speed (100 or
258                  * 1000) GENETv4 only has an internal GPHY so we will just end
259                  * up masking the Gigabit features from what we support, not
260                  * switching to the EPHY
261                  */
262                 if (GENET_IS_V4(priv))
263                         port_ctrl = PORT_MODE_INT_GPHY;
264                 else
265                         port_ctrl = PORT_MODE_INT_EPHY;
266
267                 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
268
269                 if (priv->internal_phy) {
270                         phy_name = "internal PHY";
271                 } else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
272                         phy_name = "MoCA";
273                         bcmgenet_moca_phy_setup(priv);
274                 }
275                 break;
276
277         case PHY_INTERFACE_MODE_MII:
278                 phy_name = "external MII";
279                 phydev->supported &= PHY_BASIC_FEATURES;
280                 bcmgenet_sys_writel(priv,
281                                     PORT_MODE_EXT_EPHY, SYS_PORT_CTRL);
282                 break;
283
284         case PHY_INTERFACE_MODE_REVMII:
285                 phy_name = "external RvMII";
286                 /* of_mdiobus_register took care of reading the 'max-speed'
287                  * PHY property for us, effectively limiting the PHY supported
288                  * capabilities, use that knowledge to also configure the
289                  * Reverse MII interface correctly.
290                  */
291                 if ((priv->phydev->supported & PHY_BASIC_FEATURES) ==
292                                 PHY_BASIC_FEATURES)
293                         port_ctrl = PORT_MODE_EXT_RVMII_25;
294                 else
295                         port_ctrl = PORT_MODE_EXT_RVMII_50;
296                 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
297                 break;
298
299         case PHY_INTERFACE_MODE_RGMII:
300                 /* RGMII_NO_ID: TXC transitions at the same time as TXD
301                  *              (requires PCB or receiver-side delay)
302                  * RGMII:       Add 2ns delay on TXC (90 degree shift)
303                  *
304                  * ID is implicitly disabled for 100Mbps (RG)MII operation.
305                  */
306                 id_mode_dis = BIT(16);
307                 /* fall through */
308         case PHY_INTERFACE_MODE_RGMII_TXID:
309                 if (id_mode_dis)
310                         phy_name = "external RGMII (no delay)";
311                 else
312                         phy_name = "external RGMII (TX delay)";
313                 bcmgenet_sys_writel(priv,
314                                     PORT_MODE_EXT_GPHY, SYS_PORT_CTRL);
315                 break;
316         default:
317                 dev_err(kdev, "unknown phy mode: %d\n", priv->phy_interface);
318                 return -EINVAL;
319         }
320
321         /* This is an external PHY (xMII), so we need to enable the RGMII
322          * block for the interface to work
323          */
324         if (priv->ext_phy) {
325                 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
326                 reg |= RGMII_MODE_EN | id_mode_dis;
327                 bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
328         }
329
330         dev_info_once(kdev, "configuring instance for %s\n", phy_name);
331
332         return 0;
333 }
334
335 int bcmgenet_mii_probe(struct net_device *dev)
336 {
337         struct bcmgenet_priv *priv = netdev_priv(dev);
338         struct device_node *dn = priv->pdev->dev.of_node;
339         struct phy_device *phydev;
340         u32 phy_flags;
341         int ret;
342
343         /* Communicate the integrated PHY revision */
344         phy_flags = priv->gphy_rev;
345
346         /* Initialize link state variables that bcmgenet_mii_setup() uses */
347         priv->old_link = -1;
348         priv->old_speed = -1;
349         priv->old_duplex = -1;
350         priv->old_pause = -1;
351
352         if (dn) {
353                 phydev = of_phy_connect(dev, priv->phy_dn, bcmgenet_mii_setup,
354                                         phy_flags, priv->phy_interface);
355                 if (!phydev) {
356                         pr_err("could not attach to PHY\n");
357                         return -ENODEV;
358                 }
359         } else {
360                 phydev = priv->phydev;
361                 phydev->dev_flags = phy_flags;
362
363                 ret = phy_connect_direct(dev, phydev, bcmgenet_mii_setup,
364                                          priv->phy_interface);
365                 if (ret) {
366                         pr_err("could not attach to PHY\n");
367                         return -ENODEV;
368                 }
369         }
370
371         priv->phydev = phydev;
372
373         /* Configure port multiplexer based on what the probed PHY device since
374          * reading the 'max-speed' property determines the maximum supported
375          * PHY speed which is needed for bcmgenet_mii_config() to configure
376          * things appropriately.
377          */
378         ret = bcmgenet_mii_config(dev);
379         if (ret) {
380                 phy_disconnect(priv->phydev);
381                 return ret;
382         }
383
384         phydev->advertising = phydev->supported;
385
386         /* The internal PHY has its link interrupts routed to the
387          * Ethernet MAC ISRs
388          */
389         if (priv->internal_phy)
390                 priv->phydev->irq = PHY_IGNORE_INTERRUPT;
391
392         return 0;
393 }
394
395 /* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with
396  * their internal MDIO management controller making them fail to successfully
397  * be read from or written to for the first transaction.  We insert a dummy
398  * BMSR read here to make sure that phy_get_device() and get_phy_id() can
399  * correctly read the PHY MII_PHYSID1/2 registers and successfully register a
400  * PHY device for this peripheral.
401  *
402  * Once the PHY driver is registered, we can workaround subsequent reads from
403  * there (e.g: during system-wide power management).
404  *
405  * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
406  * therefore the right location to stick that workaround. Since we do not want
407  * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
408  * Device Tree scan to limit the search area.
409  */
410 static int bcmgenet_mii_bus_reset(struct mii_bus *bus)
411 {
412         struct net_device *dev = bus->priv;
413         struct bcmgenet_priv *priv = netdev_priv(dev);
414         struct device_node *np = priv->mdio_dn;
415         struct device_node *child = NULL;
416         u32 read_mask = 0;
417         int addr = 0;
418
419         if (!np) {
420                 read_mask = 1 << priv->phy_addr;
421         } else {
422                 for_each_available_child_of_node(np, child) {
423                         addr = of_mdio_parse_addr(&dev->dev, child);
424                         if (addr < 0)
425                                 continue;
426
427                         read_mask |= 1 << addr;
428                 }
429         }
430
431         for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
432                 if (read_mask & 1 << addr) {
433                         dev_dbg(&dev->dev, "Workaround for PHY @ %d\n", addr);
434                         mdiobus_read(bus, addr, MII_BMSR);
435                 }
436         }
437
438         return 0;
439 }
440
441 static int bcmgenet_mii_alloc(struct bcmgenet_priv *priv)
442 {
443         struct mii_bus *bus;
444
445         if (priv->mii_bus)
446                 return 0;
447
448         priv->mii_bus = mdiobus_alloc();
449         if (!priv->mii_bus) {
450                 pr_err("failed to allocate\n");
451                 return -ENOMEM;
452         }
453
454         bus = priv->mii_bus;
455         bus->priv = priv->dev;
456         bus->name = "bcmgenet MII bus";
457         bus->parent = &priv->pdev->dev;
458         bus->read = bcmgenet_mii_read;
459         bus->write = bcmgenet_mii_write;
460         bus->reset = bcmgenet_mii_bus_reset;
461         snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d",
462                  priv->pdev->name, priv->pdev->id);
463
464         return 0;
465 }
466
467 static int bcmgenet_mii_of_init(struct bcmgenet_priv *priv)
468 {
469         struct device_node *dn = priv->pdev->dev.of_node;
470         struct device *kdev = &priv->pdev->dev;
471         struct phy_device *phydev = NULL;
472         char *compat;
473         int phy_mode;
474         int ret;
475
476         compat = kasprintf(GFP_KERNEL, "brcm,genet-mdio-v%d", priv->version);
477         if (!compat)
478                 return -ENOMEM;
479
480         priv->mdio_dn = of_find_compatible_node(dn, NULL, compat);
481         kfree(compat);
482         if (!priv->mdio_dn) {
483                 dev_err(kdev, "unable to find MDIO bus node\n");
484                 return -ENODEV;
485         }
486
487         ret = of_mdiobus_register(priv->mii_bus, priv->mdio_dn);
488         if (ret) {
489                 dev_err(kdev, "failed to register MDIO bus\n");
490                 return ret;
491         }
492
493         /* Fetch the PHY phandle */
494         priv->phy_dn = of_parse_phandle(dn, "phy-handle", 0);
495
496         /* In the case of a fixed PHY, the DT node associated
497          * to the PHY is the Ethernet MAC DT node.
498          */
499         if (!priv->phy_dn && of_phy_is_fixed_link(dn)) {
500                 ret = of_phy_register_fixed_link(dn);
501                 if (ret)
502                         return ret;
503
504                 priv->phy_dn = of_node_get(dn);
505         }
506
507         /* Get the link mode */
508         phy_mode = of_get_phy_mode(dn);
509         if (phy_mode < 0) {
510                 dev_err(kdev, "invalid PHY mode property\n");
511                 return phy_mode;
512         }
513
514         priv->phy_interface = phy_mode;
515
516         /* We need to specifically look up whether this PHY interface is internal
517          * or not *before* we even try to probe the PHY driver over MDIO as we
518          * may have shut down the internal PHY for power saving purposes.
519          */
520         if (priv->phy_interface == PHY_INTERFACE_MODE_INTERNAL)
521                 priv->internal_phy = true;
522
523         /* Make sure we initialize MoCA PHYs with a link down */
524         if (phy_mode == PHY_INTERFACE_MODE_MOCA) {
525                 phydev = of_phy_find_device(dn);
526                 if (phydev) {
527                         phydev->link = 0;
528                         put_device(&phydev->mdio.dev);
529                 }
530         }
531
532         return 0;
533 }
534
535 static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
536 {
537         struct device *kdev = &priv->pdev->dev;
538         struct bcmgenet_platform_data *pd = kdev->platform_data;
539         struct mii_bus *mdio = priv->mii_bus;
540         struct phy_device *phydev;
541         int ret;
542
543         if (pd->phy_interface != PHY_INTERFACE_MODE_MOCA && pd->mdio_enabled) {
544                 /*
545                  * Internal or external PHY with MDIO access
546                  */
547                 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
548                         mdio->phy_mask = ~(1 << pd->phy_address);
549                 else
550                         mdio->phy_mask = 0;
551
552                 ret = mdiobus_register(mdio);
553                 if (ret) {
554                         dev_err(kdev, "failed to register MDIO bus\n");
555                         return ret;
556                 }
557
558                 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
559                         phydev = mdiobus_get_phy(mdio, pd->phy_address);
560                 else
561                         phydev = phy_find_first(mdio);
562
563                 if (!phydev) {
564                         dev_err(kdev, "failed to register PHY device\n");
565                         mdiobus_unregister(mdio);
566                         return -ENODEV;
567                 }
568         } else {
569                 /*
570                  * MoCA port or no MDIO access.
571                  * Use fixed PHY to represent the link layer.
572                  */
573                 struct fixed_phy_status fphy_status = {
574                         .link = 1,
575                         .speed = pd->phy_speed,
576                         .duplex = pd->phy_duplex,
577                         .pause = 0,
578                         .asym_pause = 0,
579                 };
580
581                 phydev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
582                 if (!phydev || IS_ERR(phydev)) {
583                         dev_err(kdev, "failed to register fixed PHY device\n");
584                         return -ENODEV;
585                 }
586
587                 /* Make sure we initialize MoCA PHYs with a link down */
588                 phydev->link = 0;
589
590         }
591
592         priv->phydev = phydev;
593         priv->phy_interface = pd->phy_interface;
594
595         return 0;
596 }
597
598 static int bcmgenet_mii_bus_init(struct bcmgenet_priv *priv)
599 {
600         struct device_node *dn = priv->pdev->dev.of_node;
601
602         if (dn)
603                 return bcmgenet_mii_of_init(priv);
604         else
605                 return bcmgenet_mii_pd_init(priv);
606 }
607
608 int bcmgenet_mii_init(struct net_device *dev)
609 {
610         struct bcmgenet_priv *priv = netdev_priv(dev);
611         struct device_node *dn = priv->pdev->dev.of_node;
612         int ret;
613
614         ret = bcmgenet_mii_alloc(priv);
615         if (ret)
616                 return ret;
617
618         ret = bcmgenet_mii_bus_init(priv);
619         if (ret)
620                 goto out;
621
622         return 0;
623
624 out:
625         if (of_phy_is_fixed_link(dn))
626                 of_phy_deregister_fixed_link(dn);
627         of_node_put(priv->phy_dn);
628         mdiobus_unregister(priv->mii_bus);
629         mdiobus_free(priv->mii_bus);
630         return ret;
631 }
632
633 void bcmgenet_mii_exit(struct net_device *dev)
634 {
635         struct bcmgenet_priv *priv = netdev_priv(dev);
636         struct device_node *dn = priv->pdev->dev.of_node;
637
638         if (of_phy_is_fixed_link(dn))
639                 of_phy_deregister_fixed_link(dn);
640         of_node_put(priv->phy_dn);
641         mdiobus_unregister(priv->mii_bus);
642         mdiobus_free(priv->mii_bus);
643 }