1 // SPDX-License-Identifier: GPL-2.0+
3 * Generic PHY Management code
5 * Copyright 2011 Freescale Semiconductor, Inc.
8 * Based loosely off of Linux's PHY Lib
20 #include <asm/global_data.h>
21 #include <dm/of_extra.h>
22 #include <linux/bitops.h>
23 #include <linux/delay.h>
24 #include <linux/err.h>
25 #include <linux/compiler.h>
27 DECLARE_GLOBAL_DATA_PTR;
29 /* Generic PHY support and helper functions */
32 * genphy_config_advert - sanitize and advertise auto-negotiation parameters
33 * @phydev: target phy_device struct
35 * Description: Writes MII_ADVERTISE with the appropriate values,
36 * after sanitizing the values to make sure we only advertise
37 * what is supported. Returns < 0 on error, 0 if the PHY's advertisement
38 * hasn't changed, and > 0 if it has changed.
40 static int genphy_config_advert(struct phy_device *phydev)
43 int oldadv, adv, bmsr;
46 /* Only allow advertising what this PHY supports */
47 phydev->advertising &= phydev->supported;
48 advertise = phydev->advertising;
50 /* Setup standard advertisement */
51 adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
57 adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
58 ADVERTISE_PAUSE_ASYM);
59 if (advertise & ADVERTISED_10baseT_Half)
60 adv |= ADVERTISE_10HALF;
61 if (advertise & ADVERTISED_10baseT_Full)
62 adv |= ADVERTISE_10FULL;
63 if (advertise & ADVERTISED_100baseT_Half)
64 adv |= ADVERTISE_100HALF;
65 if (advertise & ADVERTISED_100baseT_Full)
66 adv |= ADVERTISE_100FULL;
67 if (advertise & ADVERTISED_Pause)
68 adv |= ADVERTISE_PAUSE_CAP;
69 if (advertise & ADVERTISED_Asym_Pause)
70 adv |= ADVERTISE_PAUSE_ASYM;
71 if (advertise & ADVERTISED_1000baseX_Half)
72 adv |= ADVERTISE_1000XHALF;
73 if (advertise & ADVERTISED_1000baseX_Full)
74 adv |= ADVERTISE_1000XFULL;
77 err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
84 bmsr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
88 /* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
89 * 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
92 if (!(bmsr & BMSR_ESTATEN))
95 /* Configure gigabit if it's supported */
96 adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
102 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
104 if (phydev->supported & (SUPPORTED_1000baseT_Half |
105 SUPPORTED_1000baseT_Full)) {
106 if (advertise & SUPPORTED_1000baseT_Half)
107 adv |= ADVERTISE_1000HALF;
108 if (advertise & SUPPORTED_1000baseT_Full)
109 adv |= ADVERTISE_1000FULL;
115 err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, adv);
123 * genphy_setup_forced - configures/forces speed/duplex from @phydev
124 * @phydev: target phy_device struct
126 * Description: Configures MII_BMCR to force speed/duplex
127 * to the values in phydev. Assumes that the values are valid.
129 static int genphy_setup_forced(struct phy_device *phydev)
132 int ctl = BMCR_ANRESTART;
135 phydev->asym_pause = 0;
137 if (phydev->speed == SPEED_1000)
138 ctl |= BMCR_SPEED1000;
139 else if (phydev->speed == SPEED_100)
140 ctl |= BMCR_SPEED100;
142 if (phydev->duplex == DUPLEX_FULL)
143 ctl |= BMCR_FULLDPLX;
145 err = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
151 * genphy_restart_aneg - Enable and Restart Autonegotiation
152 * @phydev: target phy_device struct
154 int genphy_restart_aneg(struct phy_device *phydev)
158 ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
163 ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
165 /* Don't isolate the PHY if we're negotiating */
166 ctl &= ~(BMCR_ISOLATE);
168 ctl = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
174 * genphy_config_aneg - restart auto-negotiation or write BMCR
175 * @phydev: target phy_device struct
177 * Description: If auto-negotiation is enabled, we configure the
178 * advertising, and then restart auto-negotiation. If it is not
179 * enabled, then we write the BMCR.
181 int genphy_config_aneg(struct phy_device *phydev)
185 if (phydev->autoneg != AUTONEG_ENABLE)
186 return genphy_setup_forced(phydev);
188 result = genphy_config_advert(phydev);
190 if (result < 0) /* error */
195 * Advertisment hasn't changed, but maybe aneg was never on to
196 * begin with? Or maybe phy was isolated?
198 int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
203 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
204 result = 1; /* do restart aneg */
208 * Only restart aneg if we are advertising something different
209 * than we were before.
212 result = genphy_restart_aneg(phydev);
218 * genphy_update_link - update link status in @phydev
219 * @phydev: target phy_device struct
221 * Description: Update the value in phydev->link to reflect the
222 * current link value. In order to do this, we need to read
223 * the status register twice, keeping the second value.
225 int genphy_update_link(struct phy_device *phydev)
227 unsigned int mii_reg;
230 * Wait if the link is up, and autonegotiation is in progress
231 * (ie - we're capable and it's not done)
233 mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
236 * If we already saw the link up, and it hasn't gone down, then
237 * we don't need to wait for autoneg again
239 if (phydev->link && mii_reg & BMSR_LSTATUS)
242 if ((phydev->autoneg == AUTONEG_ENABLE) &&
243 !(mii_reg & BMSR_ANEGCOMPLETE)) {
246 printf("%s Waiting for PHY auto negotiation to complete",
248 while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
252 if (i > (PHY_ANEG_TIMEOUT / 50)) {
253 printf(" TIMEOUT !\n");
259 puts("user interrupt!\n");
267 mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
268 mdelay(50); /* 50 ms */
273 /* Read the link a second time to clear the latched state */
274 mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
276 if (mii_reg & BMSR_LSTATUS)
286 * Generic function which updates the speed and duplex. If
287 * autonegotiation is enabled, it uses the AND of the link
288 * partner's advertised capabilities and our advertised
289 * capabilities. If autonegotiation is disabled, we use the
290 * appropriate bits in the control register.
292 * Stolen from Linux's mii.c and phy_device.c
294 int genphy_parse_link(struct phy_device *phydev)
296 int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
298 /* We're using autonegotiation */
299 if (phydev->autoneg == AUTONEG_ENABLE) {
304 /* Check for gigabit capability */
305 if (phydev->supported & (SUPPORTED_1000baseT_Full |
306 SUPPORTED_1000baseT_Half)) {
307 /* We want a list of states supported by
308 * both PHYs in the link
310 gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
312 debug("Could not read MII_STAT1000. ");
313 debug("Ignoring gigabit capability\n");
316 gblpa &= phy_read(phydev,
317 MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
320 /* Set the baseline so we only have to set them
321 * if they're different
323 phydev->speed = SPEED_10;
324 phydev->duplex = DUPLEX_HALF;
326 /* Check the gigabit fields */
327 if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
328 phydev->speed = SPEED_1000;
330 if (gblpa & PHY_1000BTSR_1000FD)
331 phydev->duplex = DUPLEX_FULL;
337 lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
338 lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
340 if (lpa & (LPA_100FULL | LPA_100HALF)) {
341 phydev->speed = SPEED_100;
343 if (lpa & LPA_100FULL)
344 phydev->duplex = DUPLEX_FULL;
346 } else if (lpa & LPA_10FULL) {
347 phydev->duplex = DUPLEX_FULL;
351 * Extended status may indicate that the PHY supports
352 * 1000BASE-T/X even though the 1000BASE-T registers
353 * are missing. In this case we can't tell whether the
354 * peer also supports it, so we only check extended
355 * status if the 1000BASE-T registers are actually
358 if ((mii_reg & BMSR_ESTATEN) && !(mii_reg & BMSR_ERCAP))
359 estatus = phy_read(phydev, MDIO_DEVAD_NONE,
362 if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_XHALF |
363 ESTATUS_1000_TFULL | ESTATUS_1000_THALF)) {
364 phydev->speed = SPEED_1000;
365 if (estatus & (ESTATUS_1000_XFULL | ESTATUS_1000_TFULL))
366 phydev->duplex = DUPLEX_FULL;
370 u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
372 phydev->speed = SPEED_10;
373 phydev->duplex = DUPLEX_HALF;
375 if (bmcr & BMCR_FULLDPLX)
376 phydev->duplex = DUPLEX_FULL;
378 if (bmcr & BMCR_SPEED1000)
379 phydev->speed = SPEED_1000;
380 else if (bmcr & BMCR_SPEED100)
381 phydev->speed = SPEED_100;
387 int genphy_config(struct phy_device *phydev)
392 features = (SUPPORTED_TP | SUPPORTED_MII
393 | SUPPORTED_AUI | SUPPORTED_FIBRE |
396 /* Do we support autonegotiation? */
397 val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
402 if (val & BMSR_ANEGCAPABLE)
403 features |= SUPPORTED_Autoneg;
405 if (val & BMSR_100FULL)
406 features |= SUPPORTED_100baseT_Full;
407 if (val & BMSR_100HALF)
408 features |= SUPPORTED_100baseT_Half;
409 if (val & BMSR_10FULL)
410 features |= SUPPORTED_10baseT_Full;
411 if (val & BMSR_10HALF)
412 features |= SUPPORTED_10baseT_Half;
414 if (val & BMSR_ESTATEN) {
415 val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
420 if (val & ESTATUS_1000_TFULL)
421 features |= SUPPORTED_1000baseT_Full;
422 if (val & ESTATUS_1000_THALF)
423 features |= SUPPORTED_1000baseT_Half;
424 if (val & ESTATUS_1000_XFULL)
425 features |= SUPPORTED_1000baseX_Full;
426 if (val & ESTATUS_1000_XHALF)
427 features |= SUPPORTED_1000baseX_Half;
430 phydev->supported &= features;
431 phydev->advertising &= features;
433 genphy_config_aneg(phydev);
438 int genphy_startup(struct phy_device *phydev)
442 ret = genphy_update_link(phydev);
446 return genphy_parse_link(phydev);
449 int genphy_shutdown(struct phy_device *phydev)
454 U_BOOT_PHY_DRIVER(genphy) = {
457 .name = "Generic PHY",
458 .features = PHY_GBIT_FEATURES | SUPPORTED_MII |
459 SUPPORTED_AUI | SUPPORTED_FIBRE |
461 .config = genphy_config,
462 .startup = genphy_startup,
463 .shutdown = genphy_shutdown,
466 #ifdef CONFIG_NEEDS_MANUAL_RELOC
467 static void phy_drv_reloc(struct phy_driver *drv)
470 drv->probe += gd->reloc_off;
472 drv->config += gd->reloc_off;
474 drv->startup += gd->reloc_off;
476 drv->shutdown += gd->reloc_off;
478 drv->readext += gd->reloc_off;
480 drv->writeext += gd->reloc_off;
482 drv->read_mmd += gd->reloc_off;
484 drv->write_mmd += gd->reloc_off;
490 #ifdef CONFIG_NEEDS_MANUAL_RELOC
491 const int ll_n_ents = ll_entry_count(struct phy_driver, phy_driver);
492 struct phy_driver *drv, *ll_entry;
494 /* Perform manual relocation on linker list based PHY drivers */
495 ll_entry = ll_entry_start(struct phy_driver, phy_driver);
496 for (drv = ll_entry; drv != ll_entry + ll_n_ents; drv++)
503 int phy_set_supported(struct phy_device *phydev, u32 max_speed)
505 /* The default values for phydev->supported are provided by the PHY
506 * driver "features" member, we want to reset to sane defaults first
507 * before supporting higher speeds.
509 phydev->supported &= PHY_DEFAULT_FEATURES;
515 phydev->supported |= PHY_1000BT_FEATURES;
518 phydev->supported |= PHY_100BT_FEATURES;
521 phydev->supported |= PHY_10BT_FEATURES;
527 static int phy_probe(struct phy_device *phydev)
531 phydev->advertising = phydev->drv->features;
532 phydev->supported = phydev->drv->features;
534 phydev->mmds = phydev->drv->mmds;
536 if (phydev->drv->probe)
537 err = phydev->drv->probe(phydev);
542 static struct phy_driver *generic_for_phy(struct phy_device *phydev)
544 #ifdef CONFIG_PHYLIB_10G
546 return ll_entry_get(struct phy_driver, gen10g, phy_driver);
549 return ll_entry_get(struct phy_driver, genphy, phy_driver);
552 static struct phy_driver *get_phy_driver(struct phy_device *phydev)
554 const int ll_n_ents = ll_entry_count(struct phy_driver, phy_driver);
555 int phy_id = phydev->phy_id;
556 struct phy_driver *ll_entry;
557 struct phy_driver *drv;
559 ll_entry = ll_entry_start(struct phy_driver, phy_driver);
560 for (drv = ll_entry; drv != ll_entry + ll_n_ents; drv++)
561 if ((drv->uid & drv->mask) == (phy_id & drv->mask))
564 /* If we made it here, there's no driver for this PHY */
565 return generic_for_phy(phydev);
568 struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
569 u32 phy_id, bool is_c45)
571 struct phy_device *dev;
574 * We allocate the device, and initialize the
577 dev = malloc(sizeof(*dev));
579 printf("Failed to allocate PHY device for %s:%d\n",
580 bus ? bus->name : "(null bus)", addr);
584 memset(dev, 0, sizeof(*dev));
588 dev->interface = PHY_INTERFACE_MODE_NA;
590 dev->node = ofnode_null();
592 dev->autoneg = AUTONEG_ENABLE;
595 dev->phy_id = phy_id;
596 dev->is_c45 = is_c45;
599 dev->drv = get_phy_driver(dev);
601 if (phy_probe(dev)) {
602 printf("%s, PHY probe failed\n", __func__);
606 if (addr >= 0 && addr < PHY_MAX_ADDR && phy_id != PHY_FIXED_ID)
607 bus->phymap[addr] = dev;
613 * get_phy_id - reads the specified addr for its ID.
614 * @bus: the target MII bus
615 * @addr: PHY address on the MII bus
616 * @phy_id: where to store the ID retrieved.
618 * Description: Reads the ID registers of the PHY at @addr on the
619 * @bus, stores it in @phy_id and returns zero on success.
621 int __weak get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
626 * Grab the bits from PHYIR1, and put them
629 phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
634 *phy_id = (phy_reg & 0xffff) << 16;
636 /* Grab the bits from PHYIR2, and put them in the lower half */
637 phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
642 *phy_id |= (phy_reg & 0xffff);
647 static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
648 uint phy_mask, int devad)
650 u32 phy_id = 0xffffffff;
654 int addr = ffs(phy_mask) - 1;
655 int r = get_phy_id(bus, addr, devad, &phy_id);
658 * If the PHY ID is flat 0 we ignore it. There are C45 PHYs
659 * that return all 0s for C22 reads (like Aquantia AQR112) and
660 * there are C22 PHYs that return all 0s for C45 reads (like
663 if (r == 0 && phy_id == 0)
666 /* If the PHY ID is mostly f's, we didn't find anything */
667 if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff) {
668 is_c45 = (devad == MDIO_DEVAD_NONE) ? false : true;
669 return phy_device_create(bus, addr, phy_id, is_c45);
672 phy_mask &= ~(1 << addr);
677 static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
680 /* If we have one, return the existing device, with new interface */
682 int addr = ffs(phy_mask) - 1;
684 if (bus->phymap[addr])
685 return bus->phymap[addr];
687 phy_mask &= ~(1 << addr);
692 static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
695 struct phy_device *phydev;
708 devad_cnt = sizeof(devad)/sizeof(int);
709 phydev = search_for_existing_phy(bus, phy_mask);
712 /* try different access clauses */
713 for (i = 0; i < devad_cnt; i++) {
714 phydev = create_phy_by_mask(bus, phy_mask, devad[i]);
721 debug("\n%s PHY: ", bus->name);
723 int addr = ffs(phy_mask) - 1;
726 phy_mask &= ~(1 << addr);
728 debug("not found\n");
734 * get_phy_device - reads the specified PHY device and returns its
736 * @bus: the target MII bus
737 * @addr: PHY address on the MII bus
739 * Description: Reads the ID registers of the PHY at @addr on the
740 * @bus, then allocates and returns the phy_device to represent it.
742 static struct phy_device *get_phy_device(struct mii_dev *bus, int addr)
744 return get_phy_device_by_mask(bus, 1 << addr);
747 int phy_reset(struct phy_device *phydev)
751 int devad = MDIO_DEVAD_NONE;
753 if (phydev->flags & PHY_FLAG_BROKEN_RESET)
756 #ifdef CONFIG_PHYLIB_10G
757 /* If it's 10G, we need to issue reset through one of the MMDs */
758 if (phydev->is_c45) {
760 gen10g_discover_mmds(phydev);
762 devad = ffs(phydev->mmds) - 1;
766 if (phy_write(phydev, devad, MII_BMCR, BMCR_RESET) < 0) {
767 debug("PHY reset failed\n");
771 #if CONFIG_PHY_RESET_DELAY > 0
772 udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
775 * Poll the control register for the reset bit to go to 0 (it is
776 * auto-clearing). This should happen within 0.5 seconds per the
779 reg = phy_read(phydev, devad, MII_BMCR);
780 while ((reg & BMCR_RESET) && timeout--) {
781 reg = phy_read(phydev, devad, MII_BMCR);
784 debug("PHY status read failed\n");
790 if (reg & BMCR_RESET) {
791 puts("PHY reset timed out\n");
798 int miiphy_reset(const char *devname, unsigned char addr)
800 struct mii_dev *bus = miiphy_get_dev_by_name(devname);
801 struct phy_device *phydev;
803 phydev = get_phy_device(bus, addr);
805 return phy_reset(phydev);
808 struct phy_device *phy_find_by_mask(struct mii_dev *bus, uint phy_mask)
814 /* Wait 15ms to make sure the PHY has come out of hard reset */
818 return get_phy_device_by_mask(bus, phy_mask);
821 void phy_connect_dev(struct phy_device *phydev, struct udevice *dev,
822 phy_interface_t interface)
824 /* Soft Reset the PHY */
826 if (phydev->dev && phydev->dev != dev) {
827 printf("%s:%d is connected to %s. Reconnecting to %s\n",
828 phydev->bus->name, phydev->addr,
829 phydev->dev->name, dev->name);
832 phydev->interface = interface;
833 debug("%s connected to %s mode %s\n", dev->name, phydev->drv->name,
834 phy_string_for_interface(interface));
837 #ifdef CONFIG_PHY_XILINX_GMII2RGMII
838 static struct phy_device *phy_connect_gmii2rgmii(struct mii_dev *bus,
841 struct phy_device *phydev = NULL;
844 ofnode_for_each_subnode(node, dev_ofnode(dev)) {
845 node = ofnode_by_compatible(node, "xlnx,gmii-to-rgmii-1.0");
846 if (ofnode_valid(node)) {
847 phydev = phy_device_create(bus, 0,
848 PHY_GMII2RGMII_ID, false);
854 node = ofnode_first_subnode(node);
861 #ifdef CONFIG_PHY_FIXED
863 * fixed_phy_create() - create an unconnected fixed-link pseudo-PHY device
864 * @node: OF node for the container of the fixed-link node
866 * Description: Creates a struct phy_device based on a fixed-link of_node
867 * description. Can be used without phy_connect by drivers which do not expose
868 * a UCLASS_ETH udevice.
870 struct phy_device *fixed_phy_create(ofnode node)
872 struct phy_device *phydev;
875 subnode = ofnode_find_subnode(node, "fixed-link");
876 if (!ofnode_valid(subnode)) {
880 phydev = phy_device_create(NULL, 0, PHY_FIXED_ID, false);
882 phydev->node = subnode;
883 phydev->interface = ofnode_read_phy_mode(node);
889 static struct phy_device *phy_connect_fixed(struct mii_dev *bus,
892 ofnode node = dev_ofnode(dev), subnode;
893 struct phy_device *phydev = NULL;
895 if (ofnode_phy_is_fixed_link(node, &subnode)) {
896 phydev = phy_device_create(bus, 0, PHY_FIXED_ID, false);
898 phydev->node = subnode;
905 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
907 phy_interface_t interface)
909 struct phy_device *phydev = NULL;
910 uint mask = (addr >= 0) ? (1 << addr) : 0xffffffff;
912 #ifdef CONFIG_PHY_FIXED
913 phydev = phy_connect_fixed(bus, dev);
916 #ifdef CONFIG_PHY_NCSI
917 if (!phydev && interface == PHY_INTERFACE_MODE_NCSI)
918 phydev = phy_device_create(bus, 0, PHY_NCSI_ID, false);
921 #ifdef CONFIG_PHY_ETHERNET_ID
923 phydev = phy_connect_phy_id(bus, dev, addr);
926 #ifdef CONFIG_PHY_XILINX_GMII2RGMII
928 phydev = phy_connect_gmii2rgmii(bus, dev);
932 phydev = phy_find_by_mask(bus, mask);
935 phy_connect_dev(phydev, dev, interface);
937 printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
942 * Start the PHY. Returns 0 on success, or a negative error code.
944 int phy_startup(struct phy_device *phydev)
946 if (phydev->drv->startup)
947 return phydev->drv->startup(phydev);
952 __weak int board_phy_config(struct phy_device *phydev)
954 if (phydev->drv->config)
955 return phydev->drv->config(phydev);
959 int phy_config(struct phy_device *phydev)
961 /* Invoke an optional board-specific helper */
962 return board_phy_config(phydev);
965 int phy_shutdown(struct phy_device *phydev)
967 if (phydev->drv->shutdown)
968 phydev->drv->shutdown(phydev);
974 * phy_modify - Convenience function for modifying a given PHY register
975 * @phydev: the phy_device struct
976 * @devad: The MMD to read from
977 * @regnum: register number to write
978 * @mask: bit mask of bits to clear
979 * @set: new value of bits set in mask to write to @regnum
981 int phy_modify(struct phy_device *phydev, int devad, int regnum, u16 mask,
986 ret = phy_read(phydev, devad, regnum);
990 return phy_write(phydev, devad, regnum, (ret & ~mask) | set);
994 * phy_read - Convenience function for reading a given PHY register
995 * @phydev: the phy_device struct
996 * @devad: The MMD to read from
997 * @regnum: register number to read
998 * @return: value for success or negative errno for failure
1000 int phy_read(struct phy_device *phydev, int devad, int regnum)
1002 struct mii_dev *bus = phydev->bus;
1004 if (!bus || !bus->read) {
1005 debug("%s: No bus configured\n", __func__);
1009 return bus->read(bus, phydev->addr, devad, regnum);
1013 * phy_write - Convenience function for writing a given PHY register
1014 * @phydev: the phy_device struct
1015 * @devad: The MMD to read from
1016 * @regnum: register number to write
1017 * @val: value to write to @regnum
1018 * @return: 0 for success or negative errno for failure
1020 int phy_write(struct phy_device *phydev, int devad, int regnum, u16 val)
1022 struct mii_dev *bus = phydev->bus;
1024 if (!bus || !bus->write) {
1025 debug("%s: No bus configured\n", __func__);
1029 return bus->write(bus, phydev->addr, devad, regnum, val);
1033 * phy_mmd_start_indirect - Convenience function for writing MMD registers
1034 * @phydev: the phy_device struct
1035 * @devad: The MMD to read from
1036 * @regnum: register number to write
1039 void phy_mmd_start_indirect(struct phy_device *phydev, int devad, int regnum)
1041 /* Write the desired MMD Devad */
1042 phy_write(phydev, MDIO_DEVAD_NONE, MII_MMD_CTRL, devad);
1044 /* Write the desired MMD register address */
1045 phy_write(phydev, MDIO_DEVAD_NONE, MII_MMD_DATA, regnum);
1047 /* Select the Function : DATA with no post increment */
1048 phy_write(phydev, MDIO_DEVAD_NONE, MII_MMD_CTRL,
1049 (devad | MII_MMD_CTRL_NOINCR));
1053 * phy_read_mmd - Convenience function for reading a register
1054 * from an MMD on a given PHY.
1055 * @phydev: The phy_device struct
1056 * @devad: The MMD to read from
1057 * @regnum: The register on the MMD to read
1058 * @return: Value for success or negative errno for failure
1060 int phy_read_mmd(struct phy_device *phydev, int devad, int regnum)
1062 struct phy_driver *drv = phydev->drv;
1064 if (regnum > (u16)~0 || devad > 32)
1067 /* driver-specific access */
1069 return drv->read_mmd(phydev, devad, regnum);
1071 /* direct C45 / C22 access */
1072 if ((drv->features & PHY_10G_FEATURES) == PHY_10G_FEATURES ||
1073 devad == MDIO_DEVAD_NONE || !devad)
1074 return phy_read(phydev, devad, regnum);
1076 /* indirect C22 access */
1077 phy_mmd_start_indirect(phydev, devad, regnum);
1079 /* Read the content of the MMD's selected register */
1080 return phy_read(phydev, MDIO_DEVAD_NONE, MII_MMD_DATA);
1084 * phy_write_mmd - Convenience function for writing a register
1085 * on an MMD on a given PHY.
1086 * @phydev: The phy_device struct
1087 * @devad: The MMD to read from
1088 * @regnum: The register on the MMD to read
1089 * @val: value to write to @regnum
1090 * @return: 0 for success or negative errno for failure
1092 int phy_write_mmd(struct phy_device *phydev, int devad, int regnum, u16 val)
1094 struct phy_driver *drv = phydev->drv;
1096 if (regnum > (u16)~0 || devad > 32)
1099 /* driver-specific access */
1101 return drv->write_mmd(phydev, devad, regnum, val);
1103 /* direct C45 / C22 access */
1104 if ((drv->features & PHY_10G_FEATURES) == PHY_10G_FEATURES ||
1105 devad == MDIO_DEVAD_NONE || !devad)
1106 return phy_write(phydev, devad, regnum, val);
1108 /* indirect C22 access */
1109 phy_mmd_start_indirect(phydev, devad, regnum);
1111 /* Write the data into MMD's selected register */
1112 return phy_write(phydev, MDIO_DEVAD_NONE, MII_MMD_DATA, val);
1116 * phy_set_bits_mmd - Convenience function for setting bits in a register
1118 * @phydev: the phy_device struct
1119 * @devad: the MMD containing register to modify
1120 * @regnum: register number to modify
1122 * @return: 0 for success or negative errno for failure
1124 int phy_set_bits_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
1128 value = phy_read_mmd(phydev, devad, regnum);
1134 ret = phy_write_mmd(phydev, devad, regnum, value);
1142 * phy_clear_bits_mmd - Convenience function for clearing bits in a register
1144 * @phydev: the phy_device struct
1145 * @devad: the MMD containing register to modify
1146 * @regnum: register number to modify
1147 * @val: bits to clear
1148 * @return: 0 for success or negative errno for failure
1150 int phy_clear_bits_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
1154 value = phy_read_mmd(phydev, devad, regnum);
1160 ret = phy_write_mmd(phydev, devad, regnum, value);
1167 bool phy_interface_is_ncsi(void)
1169 struct eth_pdata *pdata = dev_get_plat(eth_get_dev());
1171 return pdata->phy_interface == PHY_INTERFACE_MODE_NCSI;