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From bdb6cfe7512f7a214815a3092f0be50963dcacbc Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Sat, 18 Jun 2022 11:28:32 +0100
Subject: [PATCH] net: mii: add mii_bmcr_encode_fixed()
Add a function to encode a fixed speed/duplex to a BMCR value.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/mii.h | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -595,4 +595,39 @@ static inline u8 mii_resolve_flowctrl_fd
return cap;
}
+/**
+ * mii_bmcr_encode_fixed - encode fixed speed/duplex settings to a BMCR value
+ * @speed: a SPEED_* value
+ * @duplex: a DUPLEX_* value
+ *
+ * Encode the speed and duplex to a BMCR value. 2500, 1000, 100 and 10 Mbps are
+ * supported. 2500Mbps is encoded to 1000Mbps. Other speeds are encoded as 10
+ * Mbps. Unknown duplex values are encoded to half-duplex.
+ */
+static inline u16 mii_bmcr_encode_fixed(int speed, int duplex)
+{
+ u16 bmcr;
+
+ switch (speed) {
+ case SPEED_2500:
+ case SPEED_1000:
+ bmcr = BMCR_SPEED1000;
+ break;
+
+ case SPEED_100:
+ bmcr = BMCR_SPEED100;
+ break;
+
+ case SPEED_10:
+ default:
+ bmcr = BMCR_SPEED10;
+ break;
+ }
+
+ if (duplex == DUPLEX_FULL)
+ bmcr |= BMCR_FULLDPLX;
+
+ return bmcr;
+}
+
#endif /* __LINUX_MII_H__ */
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