[RFC PATCH net-next v2 08/17] net: dsa: qca8k: add GLOBAL_FC settings needed for qca8327

From: Ansuel Smith
Date: Sun May 02 2021 - 19:07:59 EST


Switch qca8327 needs special settings for the GLOBAL_FC_THRES regs.

Signed-off-by: Ansuel Smith <ansuelsmth@xxxxxxxxx>
---
drivers/net/dsa/qca8k.c | 10 ++++++++++
drivers/net/dsa/qca8k.h | 7 +++++++
2 files changed, 17 insertions(+)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index a91c9c36c70e..3f42d731756c 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -918,6 +918,16 @@ qca8k_setup(struct dsa_switch *ds)
}
}

+ /* Special GLOBAL_FC_THRESH value are needed for ar8327 switch */
+ if (data->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, &ret_val);
+ }
+
/* 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 34c5522e7202..5fb68dbfa85a 100644
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -166,6 +166,12 @@
#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)
@@ -242,6 +248,7 @@ struct qca8k_match_data {
};

struct qca8k_priv {
+ u8 switch_revision;
struct regmap *regmap;
struct mii_bus *bus;
struct ar8xxx_port_status port_sts[QCA8K_NUM_PORTS];
--
2.30.2