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openfirmware: Add OF phylib support code
Add support for parsing the device tree for PHY devices on an MDIO bus. Currently many of the PowerPC ethernet drivers are open coding a solution for reading data out of the device tree to find the correct PHY device. This patch implements a set of common routines to: a) let MDIO bus drivers register phy_devices described in the tree, and b) let MAC drivers find the correct phy_device via the tree. Signed-off-by: Grant Likely <[email protected]> Acked-by: Andy Fleming <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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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. | ||
*/ | ||
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#include <linux/phy.h> | ||
#include <linux/of.h> | ||
#include <linux/of_mdio.h> | ||
#include <linux/module.h> | ||
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MODULE_AUTHOR("Grant Likely <[email protected]>"); | ||
MODULE_LICENSE("GPL"); | ||
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/** | ||
* 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; | ||
int rc, i; | ||
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/* 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; | ||
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/* Clear all the IRQ properties */ | ||
if (mdio->irq) | ||
for (i=0; i<PHY_MAX_ADDR; i++) | ||
mdio->irq[i] = PHY_POLL; | ||
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/* Register the MDIO bus */ | ||
rc = mdiobus_register(mdio); | ||
if (rc) | ||
return rc; | ||
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/* Loop over the child nodes and register a phy_device for each one */ | ||
for_each_child_of_node(np, child) { | ||
const u32 *addr; | ||
int len; | ||
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/* A PHY must have a reg property in the range [0-31] */ | ||
addr = of_get_property(child, "reg", &len); | ||
if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) { | ||
dev_err(&mdio->dev, "%s has invalid PHY address\n", | ||
child->full_name); | ||
continue; | ||
} | ||
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if (mdio->irq) { | ||
mdio->irq[*addr] = irq_of_parse_and_map(child, 0); | ||
if (!mdio->irq[*addr]) | ||
mdio->irq[*addr] = PHY_POLL; | ||
} | ||
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phy = get_phy_device(mdio, *addr); | ||
if (!phy) { | ||
dev_err(&mdio->dev, "error probing PHY at address %i\n", | ||
*addr); | ||
continue; | ||
} | ||
phy_scan_fixups(phy); | ||
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/* Associate the OF node with the device structure so it | ||
* can be looked up later */ | ||
of_node_get(child); | ||
dev_archdata_set_node(&phy->dev.archdata, child); | ||
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/* 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; | ||
} | ||
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dev_dbg(&mdio->dev, "registered phy %s at address %i\n", | ||
child->name, *addr); | ||
} | ||
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return 0; | ||
} | ||
EXPORT_SYMBOL(of_mdiobus_register); | ||
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/** | ||
* 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; | ||
int match(struct device *dev, void *phy_np) | ||
{ | ||
return dev_archdata_get_node(&dev->archdata) == phy_np; | ||
} | ||
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if (!phy_np) | ||
return NULL; | ||
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d = bus_find_device(&mdio_bus_type, NULL, phy_np, match); | ||
return d ? to_phy_device(d) : NULL; | ||
} | ||
EXPORT_SYMBOL(of_phy_find_device); | ||
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/** | ||
* 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 successfull. 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); | ||
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if (!phy) | ||
return NULL; | ||
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return phy_connect_direct(dev, phy, hndlr, flags, iface) ? NULL : phy; | ||
} | ||
EXPORT_SYMBOL(of_phy_connect); |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,22 @@ | ||
/* | ||
* OF helpers for the MDIO (Ethernet PHY) API | ||
* | ||
* Copyright (c) 2009 Secret Lab Technologies, Ltd. | ||
* | ||
* This file is released under the GPLv2 | ||
*/ | ||
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#ifndef __LINUX_OF_MDIO_H | ||
#define __LINUX_OF_MDIO_H | ||
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#include <linux/phy.h> | ||
#include <linux/of.h> | ||
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extern int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np); | ||
extern struct phy_device *of_phy_find_device(struct device_node *phy_np); | ||
extern 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); | ||
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#endif /* __LINUX_OF_MDIO_H */ |