352 lines
8.8 KiB
C
352 lines
8.8 KiB
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_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;
|
|
if (mdio->irq)
|
|
mdio->irq[addr] = rc;
|
|
} else {
|
|
if (mdio->irq)
|
|
phy->irq = mdio->irq[addr];
|
|
}
|
|
|
|
/* 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);
|
|
return 1;
|
|
}
|
|
|
|
dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
|
|
child->name, addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
/**
|
|
* 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, i;
|
|
|
|
/* 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) {
|
|
addr = of_mdio_parse_addr(&mdio->dev, child);
|
|
if (addr < 0) {
|
|
scanphys = true;
|
|
continue;
|
|
}
|
|
|
|
rc = of_mdiobus_register_phy(mdio, child, addr);
|
|
if (rc)
|
|
continue;
|
|
}
|
|
|
|
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 (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);
|
|
|
|
rc = of_mdiobus_register_phy(mdio, child, addr);
|
|
if (rc)
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_mdiobus_register);
|
|
|
|
/**
|
|
* of_mdiobus_link_phydev - Find a device node for a phy
|
|
* @mdio: pointer to mii_bus structure
|
|
* @phydev: phydev for which the of_node pointer should be set
|
|
*
|
|
* Walk the list of subnodes of a mdio bus and look for a node that matches the
|
|
* phy's address with its 'reg' property. If found, set the of_node pointer for
|
|
* the phy. This allows auto-probed pyh devices to be supplied with information
|
|
* passed in via DT.
|
|
*/
|
|
void of_mdiobus_link_phydev(struct mii_bus *mdio,
|
|
struct phy_device *phydev)
|
|
{
|
|
struct device *dev = &phydev->dev;
|
|
struct device_node *child;
|
|
|
|
if (dev->of_node || !mdio->dev.of_node)
|
|
return;
|
|
|
|
for_each_available_child_of_node(mdio->dev.of_node, child) {
|
|
int addr;
|
|
|
|
addr = of_mdio_parse_addr(&mdio->dev, child);
|
|
if (addr < 0)
|
|
continue;
|
|
|
|
if (addr == phydev->addr) {
|
|
dev->of_node = child;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(of_mdiobus_link_phydev);
|
|
|
|
/* 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_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
|
|
*/
|
|
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);
|
|
|
|
if (!phy)
|
|
return NULL;
|
|
|
|
return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy;
|
|
}
|
|
EXPORT_SYMBOL(of_phy_attach);
|
|
|
|
#if defined(CONFIG_FIXED_PHY)
|
|
/*
|
|
* 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;
|
|
|
|
/* New binding */
|
|
dn = of_get_child_by_name(np, "fixed-link");
|
|
if (dn) {
|
|
of_node_put(dn);
|
|
return true;
|
|
}
|
|
|
|
/* Old binding */
|
|
if (of_get_property(np, "fixed-link", &len) &&
|
|
len == (5 * sizeof(__be32)))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
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;
|
|
const __be32 *fixed_link_prop;
|
|
int len;
|
|
|
|
/* 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))
|
|
return -EINVAL;
|
|
status.pause = of_property_read_bool(fixed_link_node, "pause");
|
|
status.asym_pause = of_property_read_bool(fixed_link_node,
|
|
"asym-pause");
|
|
of_node_put(fixed_link_node);
|
|
return fixed_phy_register(PHY_POLL, &status, np);
|
|
}
|
|
|
|
/* Old binding */
|
|
fixed_link_prop = of_get_property(np, "fixed-link", &len);
|
|
if (fixed_link_prop && len == (5 * sizeof(__be32))) {
|
|
status.link = 1;
|
|
status.duplex = be32_to_cpu(fixed_link_prop[1]);
|
|
status.speed = be32_to_cpu(fixed_link_prop[2]);
|
|
status.pause = be32_to_cpu(fixed_link_prop[3]);
|
|
status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
|
|
return fixed_phy_register(PHY_POLL, &status, np);
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL(of_phy_register_fixed_link);
|
|
#endif
|