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net: macb: add gigabit implementation for fixed-link

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A fixed gigabit link on a non-gigabit controller is only rejected
during PHY init (even though there is no PHY to init), because, on
device-tree parsing, the controller is not probed, and it is still
unknown whether it is gigabit-capable.

This code was only tested on emulator with a full-duplex RGMII
interface, but is expected to work in GMII or half-duplex as well.

Signed-off-by: Christian DREHER <christian.dreher@nanoxplore.com>
This commit is contained in:
Christian DREHER
2026-04-28 20:04:08 +02:00
committed by Jerome Forissier
parent d7fe1f4333
commit 9717831e29
1 changed files with 28 additions and 4 deletions
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32
drivers/net/macb.c
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@@ -772,18 +772,40 @@ static int macb_phy_init(struct udevice *dev, const char *name)
lpa);
} else {
/* if macb port is a fixed link */
/* TODO : manage gigabit capable processors */
const char *human_readable_speed;
speed = macb->speed;
duplex = macb->duplex;
switch (speed) {
case 2:
human_readable_speed = "1000";
break;
case 1:
human_readable_speed = "100";
break;
case 0:
human_readable_speed = "10";
break;
default:
printf("%s: speed %d not supported\n", name, speed);
return -EINVAL;
}
printf("%s: link up, %sMbps %s-duplex\n",
name,
speed ? "100" : "10",
human_readable_speed,
duplex ? "full" : "half");
}
ncfgr = macb_readl(macb, NCFGR);
ncfgr &= ~(MACB_BIT(SPD) | MACB_BIT(FD) | GEM_BIT(GBE));
if (speed) {
if (speed == 2) {
if (!gem_is_gigabit_capable(macb)) {
printf("%s: is not gigabit Ethernet capable\n", name);
return -EINVAL;
}
ncfgr |= GEM_BIT(GBE);
ret = macb_linkspd_cb(dev, _1000BASET);
} else if (speed == 1) {
ncfgr |= MACB_BIT(SPD);
ret = macb_linkspd_cb(dev, _100BASET);
} else {
@@ -1329,7 +1351,9 @@ static int macb_eth_of_to_plat(struct udevice *dev)
macb->phy_addr = PHY_MAX_ADDR + 1;
macb->duplex = fdtdec_get_bool(blob, fl_node, "full-duplex");
speed_fdt = fdtdec_get_int(blob, fl_node, "speed", 0);
if (speed_fdt == 100) {
if (speed_fdt == 1000) {
macb->speed = 2;
} else if (speed_fdt == 100) {
macb->speed = 1;
} else if (speed_fdt == 10) {
macb->speed = 0;