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phy: add phy_find_by_mask/phy_connect_dev 

It is useful to be able to try a range of
possible phy addresses to connect.

Also, an ethernet device is not required
to use phy_find_by_mask leading to better
separation of mii vs ethernet, as suggested
by Andy Fleming.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
This commit is contained in:
Troy Kisky 2012-10-22 16:40:43 +00:00 committed by Stefano Babic
parent eef2448039
commit 1adb406b01
2 changed files with 81 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

128
drivers/net/phy/phy.c
View File

@ -31,6 +31,7 @@
#include <miiphy.h>
#include <phy.h>
#include <errno.h>
#include <linux/err.h>
/* Generic PHY support and helper functions */
@ -574,6 +575,61 @@ static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
return 0;
}
static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
unsigned phy_mask, int devad, phy_interface_t interface)
{
u32 phy_id = 0xffffffff;
while (phy_mask) {
int addr = ffs(phy_mask) - 1;
int r = get_phy_id(bus, addr, devad, &phy_id);
if (r < 0)
return ERR_PTR(r);
/* If the PHY ID is mostly f's, we didn't find anything */
if ((phy_id & 0x1fffffff) != 0x1fffffff)
return phy_device_create(bus, addr, phy_id, interface);
phy_mask &= ~(1 << addr);
}
return NULL;
}
static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
unsigned phy_mask, phy_interface_t interface)
{
/* If we have one, return the existing device, with new interface */
while (phy_mask) {
int addr = ffs(phy_mask) - 1;
if (bus->phymap[addr]) {
bus->phymap[addr]->interface = interface;
return bus->phymap[addr];
}
phy_mask &= ~(1 << addr);
}
return NULL;
}
static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
unsigned phy_mask, phy_interface_t interface)
{
int i;
struct phy_device *phydev;
phydev = search_for_existing_phy(bus, phy_mask, interface);
if (phydev)
return phydev;
/* Try Standard (ie Clause 22) access */
/* Otherwise we have to try Clause 45 */
for (i = 0; i < 5; i++) {
phydev = create_phy_by_mask(bus, phy_mask,
i ? i : MDIO_DEVAD_NONE, interface);
if (IS_ERR(phydev))
return NULL;
if (phydev)
return phydev;
}
printf("Phy not found\n");
return phy_device_create(bus, ffs(phy_mask) - 1, 0xffffffff, interface);
}
/**
* get_phy_device - reads the specified PHY device and returns its @phy_device struct
* @bus: the target MII bus
@ -585,38 +641,7 @@ static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
phy_interface_t interface)
{
u32 phy_id = 0x1fffffff;
int i;
int r;
/* If we have one, return the existing device, with new interface */
if (bus->phymap[addr]) {
bus->phymap[addr]->interface = interface;
return bus->phymap[addr];
}
/* Try Standard (ie Clause 22) access */
r = get_phy_id(bus, addr, MDIO_DEVAD_NONE, &phy_id);
if (r)
return NULL;
/* If the PHY ID is mostly f's, we didn't find anything */
if ((phy_id & 0x1fffffff) != 0x1fffffff)
return phy_device_create(bus, addr, phy_id, interface);
/* Otherwise we have to try Clause 45 */
for (i = 1; i < 5; i++) {
r = get_phy_id(bus, addr, i, &phy_id);
if (r)
return NULL;
/* If the phy_id is mostly Fs, there is no device there */
if ((phy_id & 0x1fffffff) != 0x1fffffff)
break;
}
return phy_device_create(bus, addr, phy_id, interface);
return get_phy_device_by_mask(bus, 1 << addr, interface);
}
int phy_reset(struct phy_device *phydev)
@ -689,38 +714,41 @@ int miiphy_reset(const char *devname, unsigned char addr)
return phy_reset(phydev);
}
struct phy_device *phy_connect(struct mii_dev *bus, int addr,
struct eth_device *dev,
phy_interface_t interface)
struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
phy_interface_t interface)
{
struct phy_device *phydev;
/* Reset the bus */
if (bus->reset)
bus->reset(bus);
/* Wait 15ms to make sure the PHY has come out of hard reset */
udelay(15000);
return get_phy_device_by_mask(bus, phy_mask, interface);
}
phydev = get_phy_device(bus, addr, interface);
if (!phydev) {
printf("Could not get PHY for %s:%d\n", bus->name, addr);
return NULL;
}
void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
{
/* Soft Reset the PHY */
phy_reset(phydev);
if (phydev->dev)
if (phydev->dev) {
printf("%s:%d is connected to %s. Reconnecting to %s\n",
bus->name, addr, phydev->dev->name, dev->name);
phydev->bus->name, phydev->addr,
phydev->dev->name, dev->name);
}
phydev->dev = dev;
debug("%s connected to %s\n", dev->name, phydev->drv->name);
}
struct phy_device *phy_connect(struct mii_dev *bus, int addr,
struct eth_device *dev, phy_interface_t interface)
{
struct phy_device *phydev;
phydev = phy_find_by_mask(bus, 1 << addr, interface);
if (phydev)
phy_connect_dev(phydev, dev);
else
printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
return phydev;
}

3
include/phy.h
View File

@ -199,6 +199,9 @@ static inline int is_10g_interface(phy_interface_t interface)
int phy_init(void);
int phy_reset(struct phy_device *phydev);
struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
phy_interface_t interface);
void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev);
struct phy_device *phy_connect(struct mii_dev *bus, int addr,
struct eth_device *dev,
phy_interface_t interface);