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[miiphy] add feature to force link present 

If a NIC's MII isn't connected to a PHY but directly to a switch port,
the switch doesn't sent a link signal to the NIC. (Because strictly
speaking, there isn't any ethernet link at all.)

This patch adds a force link feature to the phy, to cope with this
situation.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2009-05-18 15:48:44 +02:00
parent 26a8987c46
commit 4a770377d1
2 changed files with 14 additions and 1 deletions
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12
drivers/net/miiphy.c
View File

@ -35,6 +35,10 @@ int miiphy_restart_aneg(struct miiphy_device *mdev)
* Reset PHY, then delay 300ns
*/
mdev->write(mdev, mdev->address, MII_BMCR, BMCR_RESET);
if (mdev->flags & MIIPHY_FORCE_LINK)
return 0;
udelay(1000);
if (mdev->flags & MIIPHY_FORCE_10) {
@ -71,6 +75,9 @@ int miiphy_wait_aneg(struct miiphy_device *mdev)
uint64_t start;
uint16_t status;
if (mdev->flags & MIIPHY_FORCE_LINK)
return 0;
/*
* Wait for AN completion
*/
@ -96,6 +103,11 @@ int miiphy_print_status(struct miiphy_device *mdev)
char *duplex;
int speed;
if (mdev->flags & MIIPHY_FORCE_LINK) {
printf("Forcing link present...\n");
return 0;
}
if (mdev->read(mdev, mdev->address, MII_BMSR, &bmsr) != 0)
goto err_out;
if (mdev->read(mdev, mdev->address, MII_BMCR, &bmcr) != 0)

3
include/miiphy.h
View File

@ -10,7 +10,8 @@
#include <driver.h>
#define MIIPHY_FORCE_10 1
#define MIIPHY_FORCE_10 (1 << 0)
#define MIIPHY_FORCE_LINK (1 << 1)
#define MII_BMCR 0x00 /* Basic mode control register */
#define MII_BMSR 0x01 /* Basic mode status register */