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Date:   Sun, 14 Feb 2021 02:04:04 +0100
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 1/2] net: phy: at803x: add pages support to AR8031/33

The AR8031 has two register sets: Copper and Fiber. The fiber page is
used in case of 100Base-FX and 1000Base-X. But more importantly it is
also used for the SGMII link. Add support to switch between these two.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/phy/at803x.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index d67bddc111e3..a3aa10f14638 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -144,6 +144,9 @@
 #define ATH8035_PHY_ID 0x004dd072
 #define AT8030_PHY_ID_MASK			0xffffffef
 
+#define AT803X_FIBER_PAGE 0
+#define AT803X_COPPER_PAGE 1
+
 MODULE_DESCRIPTION("Qualcomm Atheros AR803x PHY driver");
 MODULE_AUTHOR("Matus Ujhelyi");
 MODULE_LICENSE("GPL");
@@ -1143,6 +1146,36 @@ static int at803x_cable_test_start(struct phy_device *phydev)
 	return 0;
 }
 
+static int at803x_read_page(struct phy_device *phydev)
+{
+	int val;
+
+	val = __phy_read(phydev, AT803X_REG_CHIP_CONFIG);
+	if (val < 0)
+		return val;
+
+	return (val & AT803X_BT_BX_REG_SEL) ? AT803X_COPPER_PAGE : AT803X_FIBER_PAGE;
+}
+
+static int at803x_write_page(struct phy_device *phydev, int page)
+{
+	u16 sel;
+
+	switch (page) {
+	case AT803X_FIBER_PAGE:
+		sel = 0;
+		break;
+	case AT803X_COPPER_PAGE:
+		sel = AT803X_BT_BX_REG_SEL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return __phy_modify(phydev, AT803X_REG_CHIP_CONFIG,
+			    AT803X_BT_BX_REG_SEL, sel);
+}
+
 static struct phy_driver at803x_driver[] = {
 {
 	/* Qualcomm Atheros AR8035 */
@@ -1189,6 +1222,8 @@ static struct phy_driver at803x_driver[] = {
 	.flags			= PHY_POLL_CABLE_TEST,
 	.probe			= at803x_probe,
 	.remove			= at803x_remove,
+	.read_page		= at803x_read_page,
+	.write_page		= at803x_write_page,
 	.config_init		= at803x_config_init,
 	.soft_reset		= genphy_soft_reset,
 	.set_wol		= at803x_set_wol,
-- 
2.20.1

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