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/*
* 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/module.h>
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;
}
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 (!phy || IS_ERR(phy))
return 1;
rc = irq_of_parse_and_map(child, 0);
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 1;
}
dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
child->name, addr);
return 0;
}
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 (!mdiodev || IS_ERR(mdiodev))
return 1;
/* 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 1;
}
dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
child->name, addr);
return 0;
}
int of_mdio_parse_addr(struct device *dev, const struct device_node *np)
{
u32 addr;
int ret;
ret = of_property_read_u32(np, "reg", &addr);
if (ret < 0) {
dev_err(dev, "%s has invalid PHY address\n", np->full_name);
return ret;
}
/* A PHY must have a reg property in the range [0-31] */
if (addr >= PHY_MAX_ADDR) {
dev_err(dev, "%s PHY address %i is too large\n",
np->full_name, addr);
return -EINVAL;
}
return addr;
}
EXPORT_SYMBOL(of_mdio_parse_addr);
/* 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 = "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
"%s: Whitelisted compatible string. Please remove\n",
child->full_name);
return true;
}
if (!of_find_property(child, "compatible", NULL))
return true;
return false;
}
/**
* 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;
const __be32 *paddr;
bool scanphys = false;
int addr, rc;
/* 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;
/* 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))
of_mdiobus_register_phy(mdio, child, addr);
else
of_mdiobus_register_device(mdio, child, 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", NULL);
if (paddr)
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))
of_mdiobus_register_phy(mdio, child, addr);
}
}
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
*
* 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
|