1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/net/phy/microchip_t1.c b/drivers/net/phy/microchip_t1.c
new file mode 100644
index 000000000000..b1917dd1978a
--- /dev/null
+++ b/drivers/net/phy/microchip_t1.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Microchip Technology
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+/* Interrupt Source Register */
+#define LAN87XX_INTERRUPT_SOURCE                (0x18)
+
+/* Interrupt Mask Register */
+#define LAN87XX_INTERRUPT_MASK                  (0x19)
+#define LAN87XX_MASK_LINK_UP                    (0x0004)
+#define LAN87XX_MASK_LINK_DOWN                  (0x0002)
+
+#define DRIVER_AUTHOR	"Nisar Sayed <nisar.sayed@microchip.com>"
+#define DRIVER_DESC	"Microchip LAN87XX T1 PHY driver"
+
+static int lan87xx_phy_config_intr(struct phy_device *phydev)
+{
+	int rc, val = 0;
+
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
+		/* unmask all source and clear them before enable */
+		rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, 0x7FFF);
+		rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
+		val = LAN87XX_MASK_LINK_UP | LAN87XX_MASK_LINK_DOWN;
+	}
+
+	rc = phy_write(phydev, LAN87XX_INTERRUPT_MASK, val);
+
+	return rc < 0 ? rc : 0;
+}
+
+static int lan87xx_phy_ack_interrupt(struct phy_device *phydev)
+{
+	int rc = phy_read(phydev, LAN87XX_INTERRUPT_SOURCE);
+
+	return rc < 0 ? rc : 0;
+}
+
+static struct phy_driver microchip_t1_phy_driver[] = {
+	{
+		.phy_id         = 0x0007c150,
+		.phy_id_mask    = 0xfffffff0,
+		.name           = "Microchip LAN87xx T1",
+
+		.features       = SUPPORTED_100baseT_Full,
+		.flags          = PHY_HAS_INTERRUPT,
+
+		.config_init    = genphy_config_init,
+		.config_aneg    = genphy_config_aneg,
+
+		.ack_interrupt  = lan87xx_phy_ack_interrupt,
+		.config_intr    = lan87xx_phy_config_intr,
+
+		.suspend        = genphy_suspend,
+		.resume         = genphy_resume,
+	}
+};
+
+module_phy_driver(microchip_t1_phy_driver);
+
+static struct mdio_device_id __maybe_unused microchip_t1_tbl[] = {
+	{ 0x0007c150, 0xfffffff0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(mdio, microchip_t1_tbl);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");