2 * Broadcom GENET MDIO routines
4 * Copyright (c) 2014 Broadcom Corporation
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.
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>
24 #include <linux/of_net.h>
25 #include <linux/of_mdio.h>
26 #include <linux/platform_data/bcmgenet.h>
30 /* read a value from the MII */
31 static int bcmgenet_mii_read(struct mii_bus *bus, int phy_id, int location)
34 struct net_device *dev = bus->priv;
35 struct bcmgenet_priv *priv = netdev_priv(dev);
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)
48 ret = bcmgenet_umac_readl(priv, UMAC_MDIO_CMD);
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
55 if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (ret & MDIO_READ_FAIL))
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)
65 struct net_device *dev = bus->priv;
66 struct bcmgenet_priv *priv = netdev_priv(dev);
69 bcmgenet_umac_writel(priv, (MDIO_WR | (phy_id << MDIO_PMD_SHIFT) |
70 (location << MDIO_REG_SHIFT) | (0xffff & val)),
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) &
83 /* setup netdev link state when PHY link status change and
84 * update UMAC and RGMII block when link up
86 void bcmgenet_mii_setup(struct net_device *dev)
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;
93 if (priv->old_link != phydev->link) {
94 status_changed = true;
95 priv->old_link = 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;
105 if (priv->old_duplex != phydev->duplex) {
106 status_changed = true;
107 priv->old_duplex = phydev->duplex;
110 if (priv->old_pause != phydev->pause) {
111 status_changed = true;
112 priv->old_pause = phydev->pause;
115 /* done if nothing has changed */
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;
125 cmd_bits = UMAC_SPEED_10;
126 cmd_bits <<= CMD_SPEED_SHIFT;
129 if (phydev->duplex != DUPLEX_FULL)
130 cmd_bits |= CMD_HD_EN;
132 /* pause capability */
134 cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
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.
143 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
146 bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
148 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
149 reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
151 CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE);
153 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
155 /* done if nothing has changed */
159 /* needed for MoCA fixed PHY to reflect correct link status */
160 netif_carrier_off(dev);
163 phy_print_status(phydev);
167 static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
168 struct fixed_phy_status *status)
170 if (dev && dev->phydev && status)
171 status->link = dev->phydev->link;
176 /* Perform a voluntary PHY software reset, since the EPHY is very finicky about
177 * not doing it and will start corrupting packets
179 void bcmgenet_mii_reset(struct net_device *dev)
181 struct bcmgenet_priv *priv = netdev_priv(dev);
183 if (GENET_IS_V4(priv))
187 phy_init_hw(priv->phydev);
188 phy_start_aneg(priv->phydev);
192 void bcmgenet_phy_power_set(struct net_device *dev, bool enable)
194 struct bcmgenet_priv *priv = netdev_priv(dev);
197 /* EXT_GPHY_CTRL is only valid for GENETv4 and onward */
198 if (!GENET_IS_V4(priv))
201 reg = bcmgenet_ext_readl(priv, EXT_GPHY_CTRL);
203 reg &= ~EXT_CK25_DIS;
204 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
207 reg &= ~(EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN);
208 reg |= EXT_GPHY_RESET;
209 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
212 reg &= ~EXT_GPHY_RESET;
214 reg |= EXT_CFG_IDDQ_BIAS | EXT_CFG_PWR_DOWN | EXT_GPHY_RESET;
215 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
219 bcmgenet_ext_writel(priv, reg, EXT_GPHY_CTRL);
223 static void bcmgenet_moca_phy_setup(struct bcmgenet_priv *priv)
227 /* Speed settings are set in bcmgenet_mii_setup() */
228 reg = bcmgenet_sys_readl(priv, SYS_PORT_CTRL);
229 reg |= LED_ACT_SOURCE_MAC;
230 bcmgenet_sys_writel(priv, reg, SYS_PORT_CTRL);
232 if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
233 fixed_phy_set_link_update(priv->phydev,
234 bcmgenet_fixed_phy_link_update);
237 int bcmgenet_mii_config(struct net_device *dev)
239 struct bcmgenet_priv *priv = netdev_priv(dev);
240 struct phy_device *phydev = priv->phydev;
241 struct device *kdev = &priv->pdev->dev;
242 const char *phy_name = NULL;
247 priv->ext_phy = !priv->internal_phy &&
248 (priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
250 if (priv->internal_phy)
251 priv->phy_interface = PHY_INTERFACE_MODE_NA;
253 switch (priv->phy_interface) {
254 case PHY_INTERFACE_MODE_NA:
255 case PHY_INTERFACE_MODE_MOCA:
256 /* Irrespective of the actually configured PHY speed (100 or
257 * 1000) GENETv4 only has an internal GPHY so we will just end
258 * up masking the Gigabit features from what we support, not
259 * switching to the EPHY
261 if (GENET_IS_V4(priv))
262 port_ctrl = PORT_MODE_INT_GPHY;
264 port_ctrl = PORT_MODE_INT_EPHY;
266 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
268 if (priv->internal_phy) {
269 phy_name = "internal PHY";
270 } else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
272 bcmgenet_moca_phy_setup(priv);
276 case PHY_INTERFACE_MODE_MII:
277 phy_name = "external MII";
278 phydev->supported &= PHY_BASIC_FEATURES;
279 bcmgenet_sys_writel(priv,
280 PORT_MODE_EXT_EPHY, SYS_PORT_CTRL);
283 case PHY_INTERFACE_MODE_REVMII:
284 phy_name = "external RvMII";
285 /* of_mdiobus_register took care of reading the 'max-speed'
286 * PHY property for us, effectively limiting the PHY supported
287 * capabilities, use that knowledge to also configure the
288 * Reverse MII interface correctly.
290 if ((priv->phydev->supported & PHY_BASIC_FEATURES) ==
292 port_ctrl = PORT_MODE_EXT_RVMII_25;
294 port_ctrl = PORT_MODE_EXT_RVMII_50;
295 bcmgenet_sys_writel(priv, port_ctrl, SYS_PORT_CTRL);
298 case PHY_INTERFACE_MODE_RGMII:
299 /* RGMII_NO_ID: TXC transitions at the same time as TXD
300 * (requires PCB or receiver-side delay)
301 * RGMII: Add 2ns delay on TXC (90 degree shift)
303 * ID is implicitly disabled for 100Mbps (RG)MII operation.
305 id_mode_dis = BIT(16);
307 case PHY_INTERFACE_MODE_RGMII_TXID:
309 phy_name = "external RGMII (no delay)";
311 phy_name = "external RGMII (TX delay)";
312 bcmgenet_sys_writel(priv,
313 PORT_MODE_EXT_GPHY, SYS_PORT_CTRL);
316 dev_err(kdev, "unknown phy mode: %d\n", priv->phy_interface);
320 /* This is an external PHY (xMII), so we need to enable the RGMII
321 * block for the interface to work
324 reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
325 reg |= RGMII_MODE_EN | id_mode_dis;
326 bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
329 dev_info_once(kdev, "configuring instance for %s\n", phy_name);
334 int bcmgenet_mii_probe(struct net_device *dev)
336 struct bcmgenet_priv *priv = netdev_priv(dev);
337 struct device_node *dn = priv->pdev->dev.of_node;
338 struct phy_device *phydev;
342 /* Communicate the integrated PHY revision */
343 phy_flags = priv->gphy_rev;
345 /* Initialize link state variables that bcmgenet_mii_setup() uses */
347 priv->old_speed = -1;
348 priv->old_duplex = -1;
349 priv->old_pause = -1;
352 phydev = of_phy_connect(dev, priv->phy_dn, bcmgenet_mii_setup,
353 phy_flags, priv->phy_interface);
355 pr_err("could not attach to PHY\n");
359 phydev = priv->phydev;
360 phydev->dev_flags = phy_flags;
362 ret = phy_connect_direct(dev, phydev, bcmgenet_mii_setup,
363 priv->phy_interface);
365 pr_err("could not attach to PHY\n");
370 priv->phydev = phydev;
372 /* Configure port multiplexer based on what the probed PHY device since
373 * reading the 'max-speed' property determines the maximum supported
374 * PHY speed which is needed for bcmgenet_mii_config() to configure
375 * things appropriately.
377 ret = bcmgenet_mii_config(dev);
379 phy_disconnect(priv->phydev);
383 phydev->advertising = phydev->supported;
385 /* The internal PHY has its link interrupts routed to the
388 if (priv->internal_phy)
389 priv->phydev->irq = PHY_IGNORE_INTERRUPT;
394 /* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with
395 * their internal MDIO management controller making them fail to successfully
396 * be read from or written to for the first transaction. We insert a dummy
397 * BMSR read here to make sure that phy_get_device() and get_phy_id() can
398 * correctly read the PHY MII_PHYSID1/2 registers and successfully register a
399 * PHY device for this peripheral.
401 * Once the PHY driver is registered, we can workaround subsequent reads from
402 * there (e.g: during system-wide power management).
404 * bus->reset is invoked before mdiobus_scan during mdiobus_register and is
405 * therefore the right location to stick that workaround. Since we do not want
406 * to read from non-existing PHYs, we either use bus->phy_mask or do a manual
407 * Device Tree scan to limit the search area.
409 static int bcmgenet_mii_bus_reset(struct mii_bus *bus)
411 struct net_device *dev = bus->priv;
412 struct bcmgenet_priv *priv = netdev_priv(dev);
413 struct device_node *np = priv->mdio_dn;
414 struct device_node *child = NULL;
419 read_mask = 1 << priv->phy_addr;
421 for_each_available_child_of_node(np, child) {
422 addr = of_mdio_parse_addr(&dev->dev, child);
426 read_mask |= 1 << addr;
430 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
431 if (read_mask & 1 << addr) {
432 dev_dbg(&dev->dev, "Workaround for PHY @ %d\n", addr);
433 mdiobus_read(bus, addr, MII_BMSR);
440 static int bcmgenet_mii_alloc(struct bcmgenet_priv *priv)
447 priv->mii_bus = mdiobus_alloc();
448 if (!priv->mii_bus) {
449 pr_err("failed to allocate\n");
454 bus->priv = priv->dev;
455 bus->name = "bcmgenet MII bus";
456 bus->parent = &priv->pdev->dev;
457 bus->read = bcmgenet_mii_read;
458 bus->write = bcmgenet_mii_write;
459 bus->reset = bcmgenet_mii_bus_reset;
460 snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d",
461 priv->pdev->name, priv->pdev->id);
466 static int bcmgenet_mii_of_init(struct bcmgenet_priv *priv)
468 struct device_node *dn = priv->pdev->dev.of_node;
469 struct device *kdev = &priv->pdev->dev;
470 const char *phy_mode_str = NULL;
471 struct phy_device *phydev = NULL;
476 compat = kasprintf(GFP_KERNEL, "brcm,genet-mdio-v%d", priv->version);
480 priv->mdio_dn = of_find_compatible_node(dn, NULL, compat);
482 if (!priv->mdio_dn) {
483 dev_err(kdev, "unable to find MDIO bus node\n");
487 ret = of_mdiobus_register(priv->mii_bus, priv->mdio_dn);
489 dev_err(kdev, "failed to register MDIO bus\n");
493 /* Fetch the PHY phandle */
494 priv->phy_dn = of_parse_phandle(dn, "phy-handle", 0);
496 /* In the case of a fixed PHY, the DT node associated
497 * to the PHY is the Ethernet MAC DT node.
499 if (!priv->phy_dn && of_phy_is_fixed_link(dn)) {
500 ret = of_phy_register_fixed_link(dn);
504 priv->phy_dn = of_node_get(dn);
507 /* Get the link mode */
508 phy_mode = of_get_phy_mode(dn);
509 priv->phy_interface = phy_mode;
511 /* We need to specifically look up whether this PHY interface is internal
512 * or not *before* we even try to probe the PHY driver over MDIO as we
513 * may have shut down the internal PHY for power saving purposes.
516 ret = of_property_read_string(dn, "phy-mode", &phy_mode_str);
518 dev_err(kdev, "invalid PHY mode property\n");
522 priv->phy_interface = PHY_INTERFACE_MODE_NA;
523 if (!strcasecmp(phy_mode_str, "internal"))
524 priv->internal_phy = true;
527 /* Make sure we initialize MoCA PHYs with a link down */
528 if (phy_mode == PHY_INTERFACE_MODE_MOCA) {
529 phydev = of_phy_find_device(dn);
532 put_device(&phydev->mdio.dev);
539 static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
541 struct device *kdev = &priv->pdev->dev;
542 struct bcmgenet_platform_data *pd = kdev->platform_data;
543 struct mii_bus *mdio = priv->mii_bus;
544 struct phy_device *phydev;
547 if (pd->phy_interface != PHY_INTERFACE_MODE_MOCA && pd->mdio_enabled) {
549 * Internal or external PHY with MDIO access
551 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
552 mdio->phy_mask = ~(1 << pd->phy_address);
556 ret = mdiobus_register(mdio);
558 dev_err(kdev, "failed to register MDIO bus\n");
562 if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
563 phydev = mdiobus_get_phy(mdio, pd->phy_address);
565 phydev = phy_find_first(mdio);
568 dev_err(kdev, "failed to register PHY device\n");
569 mdiobus_unregister(mdio);
574 * MoCA port or no MDIO access.
575 * Use fixed PHY to represent the link layer.
577 struct fixed_phy_status fphy_status = {
579 .speed = pd->phy_speed,
580 .duplex = pd->phy_duplex,
585 phydev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
586 if (!phydev || IS_ERR(phydev)) {
587 dev_err(kdev, "failed to register fixed PHY device\n");
591 /* Make sure we initialize MoCA PHYs with a link down */
596 priv->phydev = phydev;
597 priv->phy_interface = pd->phy_interface;
602 static int bcmgenet_mii_bus_init(struct bcmgenet_priv *priv)
604 struct device_node *dn = priv->pdev->dev.of_node;
607 return bcmgenet_mii_of_init(priv);
609 return bcmgenet_mii_pd_init(priv);
612 int bcmgenet_mii_init(struct net_device *dev)
614 struct bcmgenet_priv *priv = netdev_priv(dev);
615 struct device_node *dn = priv->pdev->dev.of_node;
618 ret = bcmgenet_mii_alloc(priv);
622 ret = bcmgenet_mii_bus_init(priv);
629 if (of_phy_is_fixed_link(dn))
630 of_phy_deregister_fixed_link(dn);
631 of_node_put(priv->phy_dn);
632 mdiobus_unregister(priv->mii_bus);
633 mdiobus_free(priv->mii_bus);
637 void bcmgenet_mii_exit(struct net_device *dev)
639 struct bcmgenet_priv *priv = netdev_priv(dev);
640 struct device_node *dn = priv->pdev->dev.of_node;
642 if (of_phy_is_fixed_link(dn))
643 of_phy_deregister_fixed_link(dn);
644 of_node_put(priv->phy_dn);
645 mdiobus_unregister(priv->mii_bus);
646 mdiobus_free(priv->mii_bus);