Release 4.14 drivers/of/of_mdio.c

/*
 * OF helpers for the MDIO (Ethernet PHY) API
 *
 * Copyright (c) 2009 Secret Lab Technologies, Ltd.
 *
 * This file is released under the GPLv2
 *
 * This file provides helper functions for extracting PHY device information
 * out of the OpenFirmware device tree and using it to populate an mii_bus.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/err.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/module.h>


#define DEFAULT_GPIO_RESET_DELAY	10	
/* in microseconds */

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");

/* Extract the clause 22 phy ID from the compatible string of the form
 * ethernet-phy-idAAAA.BBBB */


static int of_get_phy_id(struct device_node *device, u32 *phy_id)
{
	struct property *prop;
	const char *cp;
	unsigned int upper, lower;

	of_property_for_each_string(device, "compatible", prop, cp) {
		if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
			*phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
			return 0;
		}
	}
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jason Gunthorpe
88
100.00%
1
100.00%
Total
88
100.00%
1
100.00%



static int of_mdiobus_register_phy(struct mii_bus *mdio,
				    struct device_node *child, u32 addr)
{
	struct phy_device *phy;
	bool is_c45;
	int rc;
	u32 phy_id;

	is_c45 = of_device_is_compatible(child,
					 "ethernet-phy-ieee802.3-c45");

	if (!is_c45 && !of_get_phy_id(child, &phy_id))
		phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
	else
		phy = get_phy_device(mdio, addr, is_c45);
	if (IS_ERR(phy))
		return PTR_ERR(phy);

	rc = of_irq_get(child, 0);
	if (rc == -EPROBE_DEFER) {
		phy_device_free(phy);
		return rc;
	}
	if (rc > 0) {
		phy->irq = rc;
		mdio->irq[addr] = rc;
	} else {
		phy->irq = mdio->irq[addr];
	}

	if (of_property_read_bool(child, "broken-turn-around"))
		mdio->phy_ignore_ta_mask |= 1 << addr;

	/* Associate the OF node with the device structure so it
         * can be looked up later */
	of_node_get(child);
	phy->mdio.dev.of_node = child;

	/* All data is now stored in the phy struct;
         * register it */
	rc = phy_device_register(phy);
	if (rc) {
		phy_device_free(phy);
		of_node_put(child);
		return rc;
	}

	dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
		child->name, addr);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Fainelli
148
62.18%
4
44.44%
Jason Gunthorpe
32
13.45%
1
11.11%
Geert Uytterhoeven
31
13.03%
1
11.11%
Ben Dooks
24
10.08%
1
11.11%
Andrew Lunn
2
0.84%
1
11.11%
Sergei Shtylyov
1
0.42%
1
11.11%
Total
238
100.00%
9
100.00%



static int of_mdiobus_register_device(struct mii_bus *mdio,
				      struct device_node *child, u32 addr)
{
	struct mdio_device *mdiodev;
	int rc;

	mdiodev = mdio_device_create(mdio, addr);
	if (IS_ERR(mdiodev))
		return PTR_ERR(mdiodev);

	/* Associate the OF node with the device structure so it
         * can be looked up later.
         */
	of_node_get(child);
	mdiodev->dev.of_node = child;

	/* All data is now stored in the mdiodev struct; register it. */
	rc = mdio_device_register(mdiodev);
	if (rc) {
		mdio_device_free(mdiodev);
		of_node_put(child);
		return rc;
	}

	dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
		child->name, addr);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Lunn
96
88.07%
1
50.00%
Geert Uytterhoeven
13
11.93%
1
50.00%
Total
109
100.00%
2
100.00%

/* The following is a list of PHY compatible strings which appear in
 * some DTBs. The compatible string is never matched against a PHY
 * driver, so is pointless. We only expect devices which are not PHYs
 * to have a compatible string, so they can be matched to an MDIO
 * driver.  Encourage users to upgrade their DT blobs to remove these.
 */

static const struct of_device_id whitelist_phys[] = {
	{ .compatible = "brcm,40nm-ephy" },
	{ .compatible = "broadcom,bcm5241" },
	{ .compatible = "marvell,88E1111", },
	{ .compatible = "marvell,88e1116", },
	{ .compatible = "marvell,88e1118", },
	{ .compatible = "marvell,88e1145", },
	{ .compatible = "marvell,88e1149r", },
	{ .compatible = "marvell,88e1310", },
	{ .compatible = "marvell,88E1510", },
	{ .compatible = "marvell,88E1514", },
	{ .compatible = "moxa,moxart-rtl8201cp", },
	{}
};

/*
 * Return true if the child node is for a phy. It must either:
 * o Compatible string of "ethernet-phy-idX.X"
 * o Compatible string of "ethernet-phy-ieee802.3-c45"
 * o Compatible string of "ethernet-phy-ieee802.3-c22"
 * o In the white list above (and issue a warning)
 * o No compatibility string
 *
 * A device which is not a phy is expected to have a compatible string
 * indicating what sort of device it is.
 */


static bool of_mdiobus_child_is_phy(struct device_node *child)
{
	u32 phy_id;

	if (of_get_phy_id(child, &phy_id) != -EINVAL)
		return true;

	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
		return true;

	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
		return true;

	if (of_match_node(whitelist_phys, child)) {
		pr_warn(FW_WARN
			"%pOF: Whitelisted compatible string. Please remove\n",
			child);
		return true;
	}

	if (!of_find_property(child, "compatible", NULL))
		return true;

	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Lunn
93
98.94%
2
66.67%
Rob Herring
1
1.06%
1
33.33%
Total
94
100.00%
3
100.00%

/**
 * of_mdiobus_register - Register mii_bus and create PHYs from the device tree
 * @mdio: pointer to mii_bus structure
 * @np: pointer to device_node of MDIO bus.
 *
 * This function registers the mii_bus structure and registers a phy_device
 * for each child node of @np.
 */


int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
{
	struct device_node *child;
	bool scanphys = false;
	int addr, rc;

	/* Do not continue if the node is disabled */
	if (!of_device_is_available(np))
		return -ENODEV;

	/* Mask out all PHYs from auto probing.  Instead the PHYs listed in
         * the device tree are populated after the bus has been registered */
	mdio->phy_mask = ~0;

	mdio->dev.of_node = np;

	/* Get bus level PHY reset GPIO details */
	mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
	of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);

	/* Register the MDIO bus */
	rc = mdiobus_register(mdio);
	if (rc)
		return rc;

	/* Loop over the child nodes and register a phy_device for each phy */
	for_each_available_child_of_node(np, child) {
		addr = of_mdio_parse_addr(&mdio->dev, child);
		if (addr < 0) {
			scanphys = true;
			continue;
		}

		if (of_mdiobus_child_is_phy(child))
			rc = of_mdiobus_register_phy(mdio, child, addr);
		else
			rc = of_mdiobus_register_device(mdio, child, addr);
		if (rc)
			goto unregister;
	}

	if (!scanphys)
		return 0;

	/* auto scan for PHYs with empty reg property */
	for_each_available_child_of_node(np, child) {
		/* Skip PHYs with reg property set */
		if (of_find_property(child, "reg", NULL))
			continue;

		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
			/* skip already registered PHYs */
			if (mdiobus_is_registered_device(mdio, addr))
				continue;

			/* be noisy to encourage people to set reg property */
			dev_info(&mdio->dev, "scan phy %s at address %i\n",
				 child->name, addr);

			if (of_mdiobus_child_is_phy(child)) {
				rc = of_mdiobus_register_phy(mdio, child, addr);
				if (rc)
					goto unregister;
			}
		}
	}

	return 0;

unregister:
	mdiobus_unregister(mdio);
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Hesselbarth
78
28.16%
1
6.25%
Grant C. Likely
71
25.63%
1
6.25%
Geert Uytterhoeven
32
11.55%
1
6.25%
Andrew Lunn
29
10.47%
3
18.75%
Roger Quadros
19
6.86%
1
6.25%
David Daney
18
6.50%
2
12.50%
Florian Fainelli
16
5.78%
2
12.50%
Daniel Mack
10
3.61%
3
18.75%
Sergei Shtylyov
3
1.08%
1
6.25%
Alexander Sverdlin
1
0.36%
1
6.25%
Total
277
100.00%
16
100.00%


EXPORT_SYMBOL(of_mdiobus_register);

/* Helper function for of_phy_find_device */


static int of_phy_match(struct device *dev, void *phy_np)
{
	return dev->of_node == phy_np;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
20
90.91%
2
66.67%
Jérôme Pouiller
2
9.09%
1
33.33%
Total
22
100.00%
3
100.00%

/**
 * of_phy_find_device - Give a PHY node, find the phy_device
 * @phy_np: Pointer to the phy's device tree node
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure.
 */


struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
	struct device *d;
	struct mdio_device *mdiodev;

	if (!phy_np)
		return NULL;

	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
	if (d) {
		mdiodev = to_mdio_device(d);
		if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
			return to_phy_device(d);
		put_device(d);
	}

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
29
36.71%
1
25.00%
Andrew Lunn
28
35.44%
1
25.00%
Jérôme Pouiller
17
21.52%
1
25.00%
Johan Hovold
5
6.33%
1
25.00%
Total
79
100.00%
4
100.00%


EXPORT_SYMBOL(of_phy_find_device);

/**
 * of_phy_connect - Connect to the phy described in the device tree
 * @dev: pointer to net_device claiming the phy
 * @phy_np: Pointer to device tree node for the PHY
 * @hndlr: Link state callback for the network device
 * @flags: flags to pass to the PHY
 * @iface: PHY data interface type
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */


struct phy_device *of_phy_connect(struct net_device *dev,
				  struct device_node *phy_np,
				  void (*hndlr)(struct net_device *), u32 flags,
				  phy_interface_t iface)
{
	struct phy_device *phy = of_phy_find_device(phy_np);
	int ret;

	if (!phy)
		return NULL;

	phy->dev_flags = flags;

	ret = phy_connect_direct(dev, phy, hndlr, iface);

	/* refcount is held by phy_connect_direct() on success */
	put_device(&phy->mdio.dev);

	return ret ? NULL : phy;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
67
72.83%
1
25.00%
Russell King
17
18.48%
1
25.00%
Florian Fainelli
6
6.52%
1
25.00%
Andrew Lunn
2
2.17%
1
25.00%
Total
92
100.00%
4
100.00%


EXPORT_SYMBOL(of_phy_connect);

/**
 * of_phy_get_and_connect
 * - Get phy node and connect to the phy described in the device tree
 * @dev: pointer to net_device claiming the phy
 * @np: Pointer to device tree node for the net_device claiming the phy
 * @hndlr: Link state callback for the network device
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */


struct phy_device *of_phy_get_and_connect(struct net_device *dev,
					  struct device_node *np,
					  void (*hndlr)(struct net_device *))
{
	phy_interface_t iface;
	struct device_node *phy_np;
	struct phy_device *phy;

	iface = of_get_phy_mode(np);
	if (iface < 0)
		return NULL;

	phy_np = of_parse_phandle(np, "phy-handle", 0);
	if (!phy_np)
		return NULL;

	phy = of_phy_connect(dev, phy_np, hndlr, 0, iface);

	of_node_put(phy_np);

	return phy;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dongpo Li
99
100.00%
1
100.00%
Total
99
100.00%
1
100.00%


EXPORT_SYMBOL(of_phy_get_and_connect);

/**
 * of_phy_attach - Attach to a PHY without starting the state machine
 * @dev: pointer to net_device claiming the phy
 * @phy_np: Node pointer for the PHY
 * @flags: flags to pass to the PHY
 * @iface: PHY data interface type
 *
 * If successful, returns a pointer to the phy_device with the embedded
 * struct device refcount incremented by one, or NULL on failure. The
 * refcount must be dropped by calling phy_disconnect() or phy_detach().
 */


struct phy_device *of_phy_attach(struct net_device *dev,
				 struct device_node *phy_np, u32 flags,
				 phy_interface_t iface)
{
	struct phy_device *phy = of_phy_find_device(phy_np);
	int ret;

	if (!phy)
		return NULL;

	ret = phy_attach_direct(dev, phy, flags, iface);

	/* refcount is held by phy_attach_direct() on success */
	put_device(&phy->mdio.dev);

	return ret ? NULL : phy;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andy Fleming
56
74.67%
1
33.33%
Russell King
17
22.67%
1
33.33%
Andrew Lunn
2
2.67%
1
33.33%
Total
75
100.00%
3
100.00%


EXPORT_SYMBOL(of_phy_attach);

/*
 * of_phy_is_fixed_link() and of_phy_register_fixed_link() must
 * support two DT bindings:
 * - the old DT binding, where 'fixed-link' was a property with 5
 *   cells encoding various informations about the fixed PHY
 * - the new DT binding, where 'fixed-link' is a sub-node of the
 *   Ethernet device.
 */


bool of_phy_is_fixed_link(struct device_node *np)
{
	struct device_node *dn;
	int len, err;
	const char *managed;

	/* New binding */
	dn = of_get_child_by_name(np, "fixed-link");
	if (dn) {
		of_node_put(dn);
		return true;
	}

	err = of_property_read_string(np, "managed", &managed);
	if (err == 0 && strcmp(managed, "auto") != 0)
		return true;

	/* Old binding */
	if (of_get_property(np, "fixed-link", &len) &&
	    len == (5 * sizeof(__be32)))
		return true;

	return false;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Petazzoni
72
66.06%
1
50.00%
Stas Sergeev
37
33.94%
1
50.00%
Total
109
100.00%
2
100.00%


EXPORT_SYMBOL(of_phy_is_fixed_link);



int of_phy_register_fixed_link(struct device_node *np)
{
	struct fixed_phy_status status = {};
	struct device_node *fixed_link_node;
	u32 fixed_link_prop[5];
	const char *managed;
	int link_gpio = -1;

	if (of_property_read_string(np, "managed", &managed) == 0 &&
	    strcmp(managed, "in-band-status") == 0) {
		/* status is zeroed, namely its .link member */
		goto register_phy;
	}

	/* New binding */
	fixed_link_node = of_get_child_by_name(np, "fixed-link");
	if (fixed_link_node) {
		status.link = 1;
		status.duplex = of_property_read_bool(fixed_link_node,
						      "full-duplex");
		if (of_property_read_u32(fixed_link_node, "speed",
					 &status.speed)) {
			of_node_put(fixed_link_node);
			return -EINVAL;
		}
		status.pause = of_property_read_bool(fixed_link_node, "pause");
		status.asym_pause = of_property_read_bool(fixed_link_node,
							  "asym-pause");
		link_gpio = of_get_named_gpio_flags(fixed_link_node,
						    "link-gpios", 0, NULL);
		of_node_put(fixed_link_node);
		if (link_gpio == -EPROBE_DEFER)
			return -EPROBE_DEFER;

		goto register_phy;
	}

	/* Old binding */
	if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,
				       ARRAY_SIZE(fixed_link_prop)) == 0) {
		status.link = 1;
		status.duplex = fixed_link_prop[1];
		status.speed  = fixed_link_prop[2];
		status.pause  = fixed_link_prop[3];
		status.asym_pause = fixed_link_prop[4];
		goto register_phy;
	}

	return -ENODEV;

register_phy:
	return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status, link_gpio,
						  np));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Petazzoni
161
60.30%
1
11.11%
Sergei Shtylyov
42
15.73%
3
33.33%
Stas Sergeev
28
10.49%
1
11.11%
Andrew Lunn
25
9.36%
1
11.11%
Johan Hovold
7
2.62%
1
11.11%
Richard Retanubun
3
1.12%
1
11.11%
Petri Gynther
1
0.37%
1
11.11%
Total
267
100.00%
9
100.00%


EXPORT_SYMBOL(of_phy_register_fixed_link);



void of_phy_deregister_fixed_link(struct device_node *np)
{
	struct phy_device *phydev;

	phydev = of_phy_find_device(np);
	if (!phydev)
		return;

	fixed_phy_unregister(phydev);

	put_device(&phydev->mdio.dev);	/* of_phy_find_device() */
	phy_device_free(phydev);	/* fixed_phy_register() */
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Johan Hovold
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%


EXPORT_SYMBOL(of_phy_deregister_fixed_link);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Lunn
356
19.90%
7
14.58%
Thomas Petazzoni
247
13.81%
1
2.08%
Grant C. Likely
229
12.80%
3
6.25%
Florian Fainelli
170
9.50%
6
12.50%
Jason Gunthorpe
121
6.76%
1
2.08%
Dongpo Li
108
6.04%
1
2.08%
Sebastian Hesselbarth
78
4.36%
1
2.08%
Geert Uytterhoeven
76
4.25%
1
2.08%
Johan Hovold
67
3.75%
3
6.25%
Stas Sergeev
65
3.63%
1
2.08%
Andy Fleming
61
3.41%
1
2.08%
Sergei Shtylyov
47
2.63%
6
12.50%
Russell King
36
2.01%
1
2.08%
David Daney
25
1.40%
3
6.25%
Roger Quadros
24
1.34%
1
2.08%
Ben Dooks
24
1.34%
1
2.08%
Jérôme Pouiller
20
1.12%
1
2.08%
Anton Vorontsov
12
0.67%
1
2.08%
Daniel Mack
10
0.56%
3
6.25%
Aaro Koskinen
7
0.39%
1
2.08%
Richard Retanubun
3
0.17%
1
2.08%
Petri Gynther
1
0.06%
1
2.08%
Rob Herring
1
0.06%
1
2.08%
Alexander Sverdlin
1
0.06%
1
2.08%
Total
1789
100.00%
48
100.00%
Directory: drivers/of

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.