linux-kernel - [RFC PATCH net-next v4 16/28] net: dsa: qca8k: add GLOBAL

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Message-Id: <20210508002920.19945-16-ansuelsmth@gmail.com>
Date:   Sat,  8 May 2021 02:29:06 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Ansuel Smith <ansuelsmth@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH net-next v4 16/28] net: dsa: qca8k: add GLOBAL_FC settings needed for qca8327

Switch qca8327 needs special settings for the GLOBAL_FC_THRES regs.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/net/dsa/qca8k.c | 10 ++++++++++
 drivers/net/dsa/qca8k.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 612fa77164ae..301bb94aba84 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -942,6 +942,16 @@ qca8k_setup(struct dsa_switch *ds)
 		}
 	}
 
+	/* Special GLOBAL_FC_THRESH value are needed for ar8327 switch */
+	if (priv->switch_id == QCA8K_ID_QCA8327) {
+		mask = QCA8K_GLOBAL_FC_GOL_XON_THRES(288) |
+		       QCA8K_GLOBAL_FC_GOL_XOFF_THRES(496);
+		qca8k_rmw(priv, QCA8K_REG_GLOBAL_FC_THRESH,
+			  QCA8K_GLOBAL_FC_GOL_XON_THRES_S |
+			  QCA8K_GLOBAL_FC_GOL_XOFF_THRES_S,
+			  mask);
+	}
+
 	/* Setup our port MTUs to match power on defaults */
 	for (i = 0; i < QCA8K_NUM_PORTS; i++)
 		priv->port_mtu[i] = ETH_FRAME_LEN + ETH_FCS_LEN;
diff --git a/drivers/net/dsa/qca8k.h b/drivers/net/dsa/qca8k.h
index 42d90836dffa..eceeacfe2c5d 100644
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -168,6 +168,12 @@
 #define   QCA8K_PORT_LOOKUP_STATE			GENMASK(18, 16)
 #define   QCA8K_PORT_LOOKUP_LEARN			BIT(20)
 
+#define QCA8K_REG_GLOBAL_FC_THRESH			0x800
+#define   QCA8K_GLOBAL_FC_GOL_XON_THRES(x)		((x) << 16)
+#define   QCA8K_GLOBAL_FC_GOL_XON_THRES_S		GENMASK(24, 16)
+#define   QCA8K_GLOBAL_FC_GOL_XOFF_THRES(x)		((x) << 0)
+#define   QCA8K_GLOBAL_FC_GOL_XOFF_THRES_S		GENMASK(8, 0)
+
 #define QCA8K_REG_PORT_HOL_CTRL0(_i)			(0x970 + (_i) * 0x8)
 #define   QCA8K_PORT_HOL_CTRL0_EG_PRI0_BUF		GENMASK(3, 0)
 #define   QCA8K_PORT_HOL_CTRL0_EG_PRI0(x)		((x) << 0)
-- 
2.30.2