[U-Boot] [PATCH] mii: Add mii_resolve_flowctrl_fdx()

[Yuiko.Oshino at microchip.com]

From: Yuiko Oshino <yuiko.oshino at microchip.com>

Add an mii helper function to resolve flow control status per IEEE 802.3-2005 table 28B-3.
This function was taken from the linux source tree.

Signed-off-by: Yuiko Oshino <yuiko.oshino at microchip.com>
---
 include/linux/mii.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/linux/mii.h b/include/linux/mii.h
index 66b83d8..19afb74 100644
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -190,4 +190,27 @@ static inline unsigned int mii_duplex (unsigned int duplex_lock,
 	return 0;
 }
 
+/**
+ * mii_resolve_flowctrl_fdx
+ * @lcladv: value of MII ADVERTISE register
+ * @rmtadv: value of MII LPA register
+ *
+ * Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3
+ */
+static inline u8 mii_resolve_flowctrl_fdx(u16 lcladv, u16 rmtadv)
+{
+	u8 cap = 0;
+
+	if (lcladv & rmtadv & ADVERTISE_PAUSE_CAP) {
+		cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
+	} else if (lcladv & rmtadv & ADVERTISE_PAUSE_ASYM) {
+		if (lcladv & ADVERTISE_PAUSE_CAP)
+			cap = FLOW_CTRL_RX;
+		else if (rmtadv & ADVERTISE_PAUSE_CAP)
+			cap = FLOW_CTRL_TX;
+	}
+
+	return cap;
+}
+
 #endif /* __LINUX_MII_H__ */
-- 
2.7.4
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