netdev - [PATCH RFC net-next 05/10] net: phy: aquantia: fill in possible

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Message-Id: <E1r5pCV-00DAHJ-G0@rmk-PC.armlinux.org.uk>
Date: Wed, 22 Nov 2023 15:31:39 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Marek Behún <kabel@...nel.org>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH RFC net-next 05/10] net: phy: aquantia: fill in
 possible_interfaces for AQR113C

Fill in the possible_interfaces bitmap for AQR113C so phylink knows
which interface modes will be used by the PHY.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/aquantia/aquantia.h      |  5 ++
 drivers/net/phy/aquantia/aquantia_main.c | 76 +++++++++++++++++++++++-
 2 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/aquantia/aquantia.h b/drivers/net/phy/aquantia/aquantia.h
index 9ed38972abdb..1c19ae74ad2b 100644
--- a/drivers/net/phy/aquantia/aquantia.h
+++ b/drivers/net/phy/aquantia/aquantia.h
@@ -47,6 +47,11 @@
 #define VEND1_GLOBAL_CFG_5G			0x031e
 #define VEND1_GLOBAL_CFG_10G			0x031f
 /* ...and now the fields */
+#define VEND1_GLOBAL_CFG_SERDES_MODE		GENMASK(2, 0)
+#define VEND1_GLOBAL_CFG_SERDES_MODE_XFI	0
+#define VEND1_GLOBAL_CFG_SERDES_MODE_SGMII	3
+#define VEND1_GLOBAL_CFG_SERDES_MODE_OCSGMII	4
+#define VEND1_GLOBAL_CFG_SERDES_MODE_XFI5G	6
 #define VEND1_GLOBAL_CFG_RATE_ADAPT		GENMASK(8, 7)
 #define VEND1_GLOBAL_CFG_RATE_ADAPT_NONE	0
 #define VEND1_GLOBAL_CFG_RATE_ADAPT_USX		1
diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index cc4a97741c4a..97a2fafa15ca 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -656,6 +656,80 @@ static int aqr107_resume(struct phy_device *phydev)
 	return aqr107_wait_processor_intensive_op(phydev);
 }
 
+static const u16 aqr_global_cfg_regs[] = {
+	VEND1_GLOBAL_CFG_10M,
+	VEND1_GLOBAL_CFG_100M,
+	VEND1_GLOBAL_CFG_1G,
+	VEND1_GLOBAL_CFG_2_5G,
+	VEND1_GLOBAL_CFG_5G,
+	VEND1_GLOBAL_CFG_10G
+};
+
+static int aqr107_fill_interface_modes(struct phy_device *phydev)
+{
+	unsigned long *possible = phydev->possible_interfaces;
+	unsigned int serdes_mode, rate_adapt;
+	phy_interface_t interface;
+	int i, val;
+
+	/* Walk the media-speed configuration registers to determine which
+	 * host-side serdes modes may be used by the PHY depending on the
+	 * negotiated media speed.
+	 */
+	for (i = 0; i < ARRAY_SIZE(aqr_global_cfg_regs); i++) {
+		val = phy_read_mmd(phydev, MDIO_MMD_VEND1,
+				   aqr_global_cfg_regs[i]);
+		if (val < 0)
+			return val;
+
+		serdes_mode = FIELD_GET(VEND1_GLOBAL_CFG_SERDES_MODE, val);
+		rate_adapt = FIELD_GET(VEND1_GLOBAL_CFG_RATE_ADAPT, val);
+
+		switch (serdes_mode) {
+		case VEND1_GLOBAL_CFG_SERDES_MODE_XFI:
+			if (rate_adapt == VEND1_GLOBAL_CFG_RATE_ADAPT_USX)
+				interface = PHY_INTERFACE_MODE_USXGMII;
+			else
+				interface = PHY_INTERFACE_MODE_10GBASER;
+			break;
+
+		case VEND1_GLOBAL_CFG_SERDES_MODE_XFI5G:
+			interface = PHY_INTERFACE_MODE_5GBASER;
+			break;
+
+		case VEND1_GLOBAL_CFG_SERDES_MODE_OCSGMII:
+			interface = PHY_INTERFACE_MODE_2500BASEX;
+			break;
+
+		case VEND1_GLOBAL_CFG_SERDES_MODE_SGMII:
+			interface = PHY_INTERFACE_MODE_SGMII;
+			break;
+
+		default:
+			phydev_warn(phydev, "unrecognised serdes mode %u\n",
+				    serdes_mode);
+			interface = PHY_INTERFACE_MODE_NA;
+			break;
+		}
+
+		if (interface != PHY_INTERFACE_MODE_NA)
+			__set_bit(interface, possible);
+	}
+
+	return 0;
+}
+
+static int aqr113c_config_init(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = aqr107_config_init(phydev);
+	if (ret < 0)
+		return ret;
+
+	return aqr107_fill_interface_modes(phydev);
+}
+
 static int aqr107_probe(struct phy_device *phydev)
 {
 	int ret;
@@ -794,7 +868,7 @@ static struct phy_driver aqr_driver[] = {
 	.name           = "Aquantia AQR113C",
 	.probe          = aqr107_probe,
 	.get_rate_matching = aqr107_get_rate_matching,
-	.config_init    = aqr107_config_init,
+	.config_init    = aqr113c_config_init,
 	.config_aneg    = aqr_config_aneg,
 	.config_intr    = aqr_config_intr,
 	.handle_interrupt       = aqr_handle_interrupt,
-- 
2.30.2