[LEDE-DEV] [PATCH] ar8327: Add workarounds for AR8337 switch.

[Vittorio Gambaletta (VittGam)]

Backported from Code Aurora QSDK

Signed-off-by: Vittorio Gambaletta <openwrt at vittgam.net>
---
 .../linux/generic/files/drivers/net/phy/ar8327.c   |   43 +++++++++++++++++++-
 .../linux/generic/files/drivers/net/phy/ar8327.h   |   21 ++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/target/linux/generic/files/drivers/net/phy/ar8327.c b/target/linux/generic/files/drivers/net/phy/ar8327.c
index 8e67f4b..97cee29 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8327.c
+++ b/target/linux/generic/files/drivers/net/phy/ar8327.c
@@ -506,6 +506,14 @@ ar8327_hw_config_pdata(struct ar8xxx_priv *priv,
 	ar8xxx_write(priv, AR8327_REG_PAD0_MODE, t);
 
 	t = ar8327_get_pad_cfg(pdata->pad5_cfg);
+	if (chip_is_ar8337(priv)) {
+		/*
+		 * Workaround: RGMII RX delay setting needs to be
+		 * always specified for AR8337 to avoid port 5
+		 * RX hang on high traffic / flood conditions
+		 */
+		t |= AR8327_PAD_RGMII_RXCLK_DELAY_EN;
+	}
 	ar8xxx_write(priv, AR8327_REG_PAD5_MODE, t);
 	t = ar8327_get_pad_cfg(pdata->pad6_cfg);
 	ar8xxx_write(priv, AR8327_REG_PAD6_MODE, t);
@@ -670,6 +678,39 @@ ar8327_init_globals(struct ar8xxx_priv *priv)
 	/* Disable EEE on all phy's due to stability issues */
 	for (i = 0; i < AR8XXX_NUM_PHYS; i++)
 		data->eee[i] = false;
+
+	if (chip_is_ar8337(priv)) {
+		/* Update HOL registers with values suggested by QCA switch team */
+		for (i = 0; i < AR8327_NUM_PORTS; i++) {
+			if (i == AR8216_PORT_CPU || i == 5 || i == 6) {
+				t = 0x3 << AR8327_PORT_HOL_CTRL0_EG_PRI0_BUF_S;
+				t |= 0x4 << AR8327_PORT_HOL_CTRL0_EG_PRI1_BUF_S;
+				t |= 0x4 << AR8327_PORT_HOL_CTRL0_EG_PRI2_BUF_S;
+				t |= 0x4 << AR8327_PORT_HOL_CTRL0_EG_PRI3_BUF_S;
+				t |= 0x6 << AR8327_PORT_HOL_CTRL0_EG_PRI4_BUF_S;
+				t |= 0x8 << AR8327_PORT_HOL_CTRL0_EG_PRI5_BUF_S;
+				t |= 0x1e << AR8327_PORT_HOL_CTRL0_EG_PORT_BUF_S;
+			} else {
+				t = 0x3 << AR8327_PORT_HOL_CTRL0_EG_PRI0_BUF_S;
+				t |= 0x4 << AR8327_PORT_HOL_CTRL0_EG_PRI1_BUF_S;
+				t |= 0x6 << AR8327_PORT_HOL_CTRL0_EG_PRI2_BUF_S;
+				t |= 0x8 << AR8327_PORT_HOL_CTRL0_EG_PRI3_BUF_S;
+				t |= 0x19 << AR8327_PORT_HOL_CTRL0_EG_PORT_BUF_S;
+			}
+			ar8xxx_write(priv, AR8327_REG_PORT_HOL_CTRL0(i), t);
+
+			t = 0x6 << AR8327_PORT_HOL_CTRL1_ING_BUF_S;
+			t |= AR8327_PORT_HOL_CTRL1_EG_PRI_BUF_EN;
+			t |= AR8327_PORT_HOL_CTRL1_EG_PORT_BUF_EN;
+			t |= AR8327_PORT_HOL_CTRL1_WRED_EN;
+			ar8xxx_rmw(priv, AR8327_REG_PORT_HOL_CTRL1(i),
+				   AR8327_PORT_HOL_CTRL1_ING_BUF |
+				   AR8327_PORT_HOL_CTRL1_EG_PRI_BUF_EN |
+				   AR8327_PORT_HOL_CTRL1_EG_PORT_BUF_EN |
+				   AR8327_PORT_HOL_CTRL1_WRED_EN,
+				   t);
+		}
+	}
 }
 
 static void
@@ -1397,7 +1438,7 @@ const struct ar8xxx_chip ar8327_chip = {
 	.atu_flush_port = ar8327_atu_flush_port,
 	.vtu_flush = ar8327_vtu_flush,
 	.vtu_load_vlan = ar8327_vtu_load_vlan,
-	.phy_fixup = ar8327_phy_fixup,
+	//.phy_fixup = ar8337_phy_fixup, // not needed at the moment
 	.set_mirror_regs = ar8327_set_mirror_regs,
 	.get_arl_entry = ar8327_get_arl_entry,
 	.sw_hw_apply = ar8327_sw_hw_apply,
diff --git a/target/linux/generic/files/drivers/net/phy/ar8327.h b/target/linux/generic/files/drivers/net/phy/ar8327.h
index 7bce18b..828dd28 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8327.h
+++ b/target/linux/generic/files/drivers/net/phy/ar8327.h
@@ -272,7 +272,28 @@
 
 #define AR8327_REG_PORT_PRIO(_i)		(0x664 + (_i) * 0xc)
 
+#define AR8327_REG_PORT_HOL_CTRL0(_i)		(0x970 + (_i) * 0x8)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI0_BUF	BITS(0, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI0_BUF_S	0
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI1_BUF	BITS(4, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI1_BUF_S	4
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI2_BUF	BITS(8, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI2_BUF_S	8
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI3_BUF	BITS(12, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI3_BUF_S	12
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI4_BUF	BITS(16, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI4_BUF_S	16
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI5_BUF	BITS(20, 4)
+#define   AR8327_PORT_HOL_CTRL0_EG_PRI5_BUF_S	20
+#define   AR8327_PORT_HOL_CTRL0_EG_PORT_BUF	BITS(24, 6)
+#define   AR8327_PORT_HOL_CTRL0_EG_PORT_BUF_S	24
+
 #define AR8327_REG_PORT_HOL_CTRL1(_i)		(0x974 + (_i) * 0x8)
+#define   AR8327_PORT_HOL_CTRL1_ING_BUF		BITS(0, 4)
+#define   AR8327_PORT_HOL_CTRL1_ING_BUF_S	0
+#define   AR8327_PORT_HOL_CTRL1_EG_PRI_BUF_EN	BIT(6)
+#define   AR8327_PORT_HOL_CTRL1_EG_PORT_BUF_EN	BIT(7)
+#define   AR8327_PORT_HOL_CTRL1_WRED_EN		BIT(8)
 #define   AR8327_PORT_HOL_CTRL1_EG_MIRROR_EN	BIT(16)
 
 #define AR8337_PAD_MAC06_EXCHANGE_EN		BIT(31)