[net-next PATCH v2 1/2] net: ethernet: stmmac: add missing sgmii configure for ipq806x

[Christian 'Ansuel' Marangi]

The different gmacid require different configuration based on the soc
and on the gmac id. Add these missing configuration taken from the
original driver.

Signed-off-by: Christian 'Ansuel' Marangi <ansuelsmth@xxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/Kconfig   |  1 +
 .../ethernet/stmicro/stmmac/dwmac-ipq806x.c   | 93 +++++++++++++++----
 2 files changed, 78 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 929cfc22cd0c..c4bca16dae57 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -83,6 +83,7 @@ config DWMAC_IPQ806X
 	default ARCH_QCOM
 	depends on OF && (ARCH_QCOM || COMPILE_TEST)
 	select MFD_SYSCON
+	select QCOM_SOCINFO
 	help
 	  Support for QCA IPQ806X DWMAC Ethernet.
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index f7dc8458cde8..832f442254d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -27,6 +27,8 @@
 #include <linux/stmmac.h>
 #include <linux/of_mdio.h>
 #include <linux/module.h>
+#include <linux/sys_soc.h>
+#include <linux/bitfield.h>
 
 #include "stmmac_platform.h"
 
@@ -75,11 +77,20 @@
 #define QSGMII_PHY_RX_SIGNAL_DETECT_EN		BIT(2)
 #define QSGMII_PHY_TX_DRIVER_EN			BIT(3)
 #define QSGMII_PHY_QSGMII_EN			BIT(7)
-#define QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET	12
-#define QSGMII_PHY_RX_DC_BIAS_OFFSET		18
-#define QSGMII_PHY_RX_INPUT_EQU_OFFSET		20
-#define QSGMII_PHY_CDR_PI_SLEW_OFFSET		22
-#define QSGMII_PHY_TX_DRV_AMP_OFFSET		28
+#define QSGMII_PHY_DEEMPHASIS_LVL_MASK		GENMASK(11, 10)
+#define QSGMII_PHY_DEEMPHASIS_LVL(x)		FIELD_PREP(QSGMII_PHY_DEEMPHASIS_LVL_MASK, (x))
+#define QSGMII_PHY_PHASE_LOOP_GAIN_MASK		GENMASK(14, 12)
+#define QSGMII_PHY_PHASE_LOOP_GAIN(x)		FIELD_PREP(QSGMII_PHY_PHASE_LOOP_GAIN_MASK, (x))
+#define QSGMII_PHY_RX_DC_BIAS_MASK		GENMASK(19, 18)
+#define QSGMII_PHY_RX_DC_BIAS(x)		FIELD_PREP(QSGMII_PHY_RX_DC_BIAS_MASK, (x))
+#define QSGMII_PHY_RX_INPUT_EQU_MASK		GENMASK(21, 20)
+#define QSGMII_PHY_RX_INPUT_EQU(x)		FIELD_PREP(QSGMII_PHY_RX_INPUT_EQU_MASK, (x))
+#define QSGMII_PHY_CDR_PI_SLEW_MASK		GENMASK(23, 22)
+#define QSGMII_PHY_CDR_PI_SLEW(x)		FIELD_PREP(QSGMII_PHY_CDR_PI_SLEW_MASK, (x))
+#define QSGMII_PHY_TX_SLEW_MASK			GENMASK(27, 26)
+#define QSGMII_PHY_TX_SLEW(x)			FIELD_PREP(QSGMII_PHY_TX_SLEW_MASK, (x))
+#define QSGMII_PHY_TX_DRV_AMP_MASK		GENMASK(31, 28)
+#define QSGMII_PHY_TX_DRV_AMP(x)		FIELD_PREP(QSGMII_PHY_TX_DRV_AMP_MASK, (x))
 
 struct ipq806x_gmac {
 	struct platform_device *pdev;
@@ -242,6 +253,64 @@ static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
 	ipq806x_gmac_set_speed(gmac, speed);
 }
 
+static const struct soc_device_attribute ipq806x_gmac_soc_v1[] = {
+	{
+		.revision = "1.*",
+	},
+	{
+		/* sentinel */
+	}
+};
+
+static int
+ipq806x_gmac_configure_qsgmii_params(struct ipq806x_gmac *gmac)
+{
+	struct platform_device *pdev = gmac->pdev;
+	const struct soc_device_attribute *soc;
+	struct device *dev = &pdev->dev;
+	u32 qsgmii_param;
+
+	switch (gmac->id) {
+	case 1:
+		soc = soc_device_match(ipq806x_gmac_soc_v1);
+
+		if (soc)
+			qsgmii_param = QSGMII_PHY_TX_DRV_AMP(0xc) |
+				       QSGMII_PHY_TX_SLEW(0x2) |
+				       QSGMII_PHY_DEEMPHASIS_LVL(0x2);
+		else
+			qsgmii_param = QSGMII_PHY_TX_DRV_AMP(0xd) |
+				       QSGMII_PHY_TX_SLEW(0x0) |
+				       QSGMII_PHY_DEEMPHASIS_LVL(0x0);
+
+		qsgmii_param |= QSGMII_PHY_RX_DC_BIAS(0x2);
+		break;
+	case 2:
+	case 3:
+		qsgmii_param = QSGMII_PHY_RX_DC_BIAS(0x3) |
+			       QSGMII_PHY_TX_DRV_AMP(0xc);
+		break;
+	default: /* gmac 0 can't be set in SGMII mode */
+		dev_err(dev, "gmac id %d can't be in SGMII mode", gmac->id);
+		return -EINVAL;
+	}
+
+	/* Common params across all gmac id */
+	qsgmii_param |= QSGMII_PHY_CDR_EN |
+			QSGMII_PHY_RX_FRONT_EN |
+			QSGMII_PHY_RX_SIGNAL_DETECT_EN |
+			QSGMII_PHY_TX_DRIVER_EN |
+			QSGMII_PHY_QSGMII_EN |
+			QSGMII_PHY_PHASE_LOOP_GAIN(0x4) |
+			QSGMII_PHY_RX_INPUT_EQU(0x1) |
+			QSGMII_PHY_CDR_PI_SLEW(0x2);
+
+	regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
+		     qsgmii_param);
+
+	return 0;
+}
+
 static int ipq806x_gmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
@@ -328,17 +397,9 @@ static int ipq806x_gmac_probe(struct platform_device *pdev)
 	regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 
 	if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {
-		regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
-			     QSGMII_PHY_CDR_EN |
-			     QSGMII_PHY_RX_FRONT_EN |
-			     QSGMII_PHY_RX_SIGNAL_DETECT_EN |
-			     QSGMII_PHY_TX_DRIVER_EN |
-			     QSGMII_PHY_QSGMII_EN |
-			     0x4ul << QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET |
-			     0x3ul << QSGMII_PHY_RX_DC_BIAS_OFFSET |
-			     0x1ul << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
-			     0x2ul << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
-			     0xCul << QSGMII_PHY_TX_DRV_AMP_OFFSET);
+		err = ipq806x_gmac_configure_qsgmii_params(gmac);
+		if (err)
+			goto err_remove_config_dt;
 	}
 
 	plat_dat->has_gmac = true;
-- 
2.36.1