drivers/of/of_mdio.c - kernel/msm-4.9 - Gitiles

 /*
  * 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/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_mdio.h>
 #include <linux/module.h>

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

 /**
  * 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 phy_device *phy;
 	struct device_node *child;
 	const __be32 *paddr;
 	u32 addr;
 	bool is_c45, scanphys = false;
 	int rc, i, len;

 	/* 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;

 	/* Clear all the IRQ properties */
 	if (mdio->irq)
 		for (i=0; i<PHY_MAX_ADDR; i++)
 			mdio->irq[i] = PHY_POLL;

 	mdio->dev.of_node = np;

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

 	/* Loop over the child nodes and register a phy_device for each one */
 	for_each_available_child_of_node(np, child) {
 		/* A PHY must have a reg property in the range [0-31] */
 		paddr = of_get_property(child, "reg", &len);
 		if (!paddr || len < sizeof(*paddr)) {
 			scanphys = true;
 			dev_err(&mdio->dev, "%s has invalid PHY address\n",
 				child->full_name);
 			continue;
 		}

 		addr = be32_to_cpup(paddr);
 		if (addr >= 32) {
 			dev_err(&mdio->dev, "%s PHY address %i is too large\n",
 				child->full_name, addr);
 			continue;
 		}

 		if (mdio->irq) {
 			mdio->irq[addr] = irq_of_parse_and_map(child, 0);
 			if (!mdio->irq[addr])
 				mdio->irq[addr] = PHY_POLL;
 		}

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

 		if (!phy || IS_ERR(phy)) {
 			phy = phy_device_create(mdio, addr, 0, false, NULL);
 			if (!phy || IS_ERR(phy)) {
 				dev_err(&mdio->dev,
 					"error creating PHY at address %i\n",
 					addr);
 				continue;
 			}
 		}

 		/* Associate the OF node with the device structure so it
 		 * can be looked up later */
 		of_node_get(child);
 		phy->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);
 			continue;
 		}

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

 	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 */
 		paddr = of_get_property(child, "reg", &len);
 		if (paddr)
 			continue;

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

 		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
 			/* skip already registered PHYs */
 			if (mdio->phy_map[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);

 			phy = get_phy_device(mdio, addr, is_c45);
 			if (!phy || IS_ERR(phy))
 				continue;

 			if (mdio->irq) {
 				mdio->irq[addr] =
 					irq_of_parse_and_map(child, 0);
 				if (!mdio->irq[addr])
 					mdio->irq[addr] = PHY_POLL;
 			}

 			/* Associate the OF node with the device structure so it
 			 * can be looked up later */
 			of_node_get(child);
 			phy->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);
 				continue;
 			}

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

 	return 0;
 }
 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;
 }

 /**
  * of_phy_find_device - Give a PHY node, find the phy_device
  * @phy_np: Pointer to the phy's device tree node
  *
  * Returns a pointer to the phy_device.
  */
 struct phy_device *of_phy_find_device(struct device_node *phy_np)
 {
 	struct device *d;
 	if (!phy_np)
 		return NULL;

 	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
 	return d ? to_phy_device(d) : NULL;
 }
 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
  * @iface: PHY data interface type
  *
  * Returns a pointer to the phy_device if successful.  NULL otherwise
  */
 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);

 	if (!phy)
 		return NULL;

 	return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
 }
 EXPORT_SYMBOL(of_phy_connect);

 /**
  * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
  * @dev: pointer to net_device claiming the phy
  * @hndlr: Link state callback for the network device
  * @iface: PHY data interface type
  *
  * This function is a temporary stop-gap and will be removed soon.  It is
  * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers.  Do
  * not call this function from new drivers.
  */
 struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
 					     void (*hndlr)(struct net_device *),
 					     phy_interface_t iface)
 {
 	struct device_node *net_np;
 	char bus_id[MII_BUS_ID_SIZE + 3];
 	struct phy_device *phy;
 	const __be32 *phy_id;
 	int sz;

 	if (!dev->dev.parent)
 		return NULL;

 	net_np = dev->dev.parent->of_node;
 	if (!net_np)
 		return NULL;

 	phy_id = of_get_property(net_np, "fixed-link", &sz);
 	if (!phy_id || sz < sizeof(*phy_id))
 		return NULL;

 	sprintf(bus_id, PHY_ID_FMT, "fixed-0", be32_to_cpu(phy_id[0]));

 	phy = phy_connect(dev, bus_id, hndlr, iface);
 	return IS_ERR(phy) ? NULL : phy;
 }
 EXPORT_SYMBOL(of_phy_connect_fixed_link);
	/*
	* 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/of.h>
	#include <linux/of_irq.h>
	#include <linux/of_mdio.h>
	#include <linux/module.h>

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

	/**
	* 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 phy_device *phy;
	struct device_node *child;
	const __be32 *paddr;
	u32 addr;
	bool is_c45, scanphys = false;
	int rc, i, len;

	/* 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;

	/* Clear all the IRQ properties */
	if (mdio->irq)
	for (i=0; i<PHY_MAX_ADDR; i++)
	mdio->irq[i] = PHY_POLL;

	mdio->dev.of_node = np;

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

	/* Loop over the child nodes and register a phy_device for each one */
	for_each_available_child_of_node(np, child) {
	/* A PHY must have a reg property in the range [0-31] */
	paddr = of_get_property(child, "reg", &len);
	if (!paddr \|\| len < sizeof(*paddr)) {
	scanphys = true;
	dev_err(&mdio->dev, "%s has invalid PHY address\n",
	child->full_name);
	continue;
	}

	addr = be32_to_cpup(paddr);
	if (addr >= 32) {
	dev_err(&mdio->dev, "%s PHY address %i is too large\n",
	child->full_name, addr);
	continue;
	}

	if (mdio->irq) {
	mdio->irq[addr] = irq_of_parse_and_map(child, 0);
	if (!mdio->irq[addr])
	mdio->irq[addr] = PHY_POLL;
	}

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

	if (!phy \|\| IS_ERR(phy)) {
	phy = phy_device_create(mdio, addr, 0, false, NULL);
	if (!phy \|\| IS_ERR(phy)) {
	dev_err(&mdio->dev,
	"error creating PHY at address %i\n",
	addr);
	continue;
	}
	}

	/* Associate the OF node with the device structure so it
	* can be looked up later */
	of_node_get(child);
	phy->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);
	continue;
	}

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

	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 */
	paddr = of_get_property(child, "reg", &len);
	if (paddr)
	continue;

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

	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
	/* skip already registered PHYs */
	if (mdio->phy_map[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);

	phy = get_phy_device(mdio, addr, is_c45);
	if (!phy \|\| IS_ERR(phy))
	continue;

	if (mdio->irq) {
	mdio->irq[addr] =
	irq_of_parse_and_map(child, 0);
	if (!mdio->irq[addr])
	mdio->irq[addr] = PHY_POLL;
	}

	/* Associate the OF node with the device structure so it
	* can be looked up later */
	of_node_get(child);
	phy->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);
	continue;
	}

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

	return 0;
	}
	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;
	}

	/**
	* of_phy_find_device - Give a PHY node, find the phy_device
	* @phy_np: Pointer to the phy's device tree node
	*
	* Returns a pointer to the phy_device.
	*/
	struct phy_device of_phy_find_device(struct device_node phy_np)
	{
	struct device *d;
	if (!phy_np)
	return NULL;

	d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
	return d ? to_phy_device(d) : NULL;
	}
	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
	* @iface: PHY data interface type
	*
	* Returns a pointer to the phy_device if successful. NULL otherwise
	*/
	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);

	if (!phy)
	return NULL;

	return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy;
	}
	EXPORT_SYMBOL(of_phy_connect);

	/**
	* of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy
	* @dev: pointer to net_device claiming the phy
	* @hndlr: Link state callback for the network device
	* @iface: PHY data interface type
	*
	* This function is a temporary stop-gap and will be removed soon. It is
	* only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do
	* not call this function from new drivers.
	*/
	struct phy_device of_phy_connect_fixed_link(struct net_device dev,
	void (hndlr)(struct net_device ),
	phy_interface_t iface)
	{
	struct device_node *net_np;
	char bus_id[MII_BUS_ID_SIZE + 3];
	struct phy_device *phy;
	const __be32 *phy_id;
	int sz;

	if (!dev->dev.parent)
	return NULL;

	net_np = dev->dev.parent->of_node;
	if (!net_np)
	return NULL;

	phy_id = of_get_property(net_np, "fixed-link", &sz);
	if (!phy_id \|\| sz < sizeof(*phy_id))
	return NULL;

	sprintf(bus_id, PHY_ID_FMT, "fixed-0", be32_to_cpu(phy_id[0]));

	phy = phy_connect(dev, bus_id, hndlr, iface);
	return IS_ERR(phy) ? NULL : phy;
	}
	EXPORT_SYMBOL(of_phy_connect_fixed_link);