1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/net/dsa/mv88e6xxx/pcs-6185.c b/drivers/net/dsa/mv88e6xxx/pcs-6185.c
new file mode 100644
index 000000000000..4d677f836807
--- /dev/null
+++ b/drivers/net/dsa/mv88e6xxx/pcs-6185.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Marvell 88E6185 family SERDES PCS support
+ *
+ * Copyright (c) 2008 Marvell Semiconductor
+ *
+ * Copyright (c) 2017 Andrew Lunn <andrew@lunn.ch>
+ */
+#include <linux/phylink.h>
+
+#include "global2.h"
+#include "port.h"
+#include "serdes.h"
+
+struct mv88e6185_pcs {
+	struct phylink_pcs phylink_pcs;
+	unsigned int irq;
+	char name[64];
+
+	struct mv88e6xxx_chip *chip;
+	int port;
+};
+
+static struct mv88e6185_pcs *pcs_to_mv88e6185_pcs(struct phylink_pcs *pcs)
+{
+	return container_of(pcs, struct mv88e6185_pcs, phylink_pcs);
+}
+
+static irqreturn_t mv88e6185_pcs_handle_irq(int irq, void *dev_id)
+{
+	struct mv88e6185_pcs *mpcs = dev_id;
+	struct mv88e6xxx_chip *chip;
+	irqreturn_t ret = IRQ_NONE;
+	bool link_up;
+	u16 status;
+	int port;
+	int err;
+
+	chip = mpcs->chip;
+	port = mpcs->port;
+
+	mv88e6xxx_reg_lock(chip);
+	err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &status);
+	mv88e6xxx_reg_unlock(chip);
+
+	if (!err) {
+		link_up = !!(status & MV88E6XXX_PORT_STS_LINK);
+
+		phylink_pcs_change(&mpcs->phylink_pcs, link_up);
+
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static void mv88e6185_pcs_get_state(struct phylink_pcs *pcs,
+				    struct phylink_link_state *state)
+{
+	struct mv88e6185_pcs *mpcs = pcs_to_mv88e6185_pcs(pcs);
+	struct mv88e6xxx_chip *chip = mpcs->chip;
+	int port = mpcs->port;
+	u16 status;
+	int err;
+
+	mv88e6xxx_reg_lock(chip);
+	err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &status);
+	mv88e6xxx_reg_unlock(chip);
+
+	if (err)
+		status = 0;
+
+	state->link = !!(status & MV88E6XXX_PORT_STS_LINK);
+	if (state->link) {
+		state->duplex = status & MV88E6XXX_PORT_STS_DUPLEX ?
+			DUPLEX_FULL : DUPLEX_HALF;
+
+		switch (status & MV88E6XXX_PORT_STS_SPEED_MASK) {
+		case MV88E6XXX_PORT_STS_SPEED_1000:
+			state->speed = SPEED_1000;
+			break;
+
+		case MV88E6XXX_PORT_STS_SPEED_100:
+			state->speed = SPEED_100;
+			break;
+
+		case MV88E6XXX_PORT_STS_SPEED_10:
+			state->speed = SPEED_10;
+			break;
+
+		default:
+			state->link = false;
+			break;
+		}
+	}
+}
+
+static int mv88e6185_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
+				phy_interface_t interface,
+				const unsigned long *advertising,
+				bool permit_pause_to_mac)
+{
+	return 0;
+}
+
+static void mv88e6185_pcs_an_restart(struct phylink_pcs *pcs)
+{
+}
+
+static const struct phylink_pcs_ops mv88e6185_phylink_pcs_ops = {
+	.pcs_get_state = mv88e6185_pcs_get_state,
+	.pcs_config = mv88e6185_pcs_config,
+	.pcs_an_restart = mv88e6185_pcs_an_restart,
+};
+
+static int mv88e6185_pcs_init(struct mv88e6xxx_chip *chip, int port)
+{
+	struct mv88e6185_pcs *mpcs;
+	struct device *dev;
+	unsigned int irq;
+	int err;
+
+	/* There are no configurable serdes lanes on this switch chip, so
+	 * we use the static cmode configuration to determine whether we
+	 * have a PCS or not.
+	 */
+	if (chip->ports[port].cmode != MV88E6185_PORT_STS_CMODE_SERDES &&
+	    chip->ports[port].cmode != MV88E6185_PORT_STS_CMODE_1000BASE_X)
+		return 0;
+
+	dev = chip->dev;
+
+	mpcs = kzalloc(sizeof(*mpcs), GFP_KERNEL);
+	if (!mpcs)
+		return -ENOMEM;
+
+	mpcs->chip = chip;
+	mpcs->port = port;
+	mpcs->phylink_pcs.ops = &mv88e6185_phylink_pcs_ops;
+
+	irq = mv88e6xxx_serdes_irq_mapping(chip, port);
+	if (irq) {
+		snprintf(mpcs->name, sizeof(mpcs->name),
+			 "mv88e6xxx-%s-serdes-%d", dev_name(dev), port);
+
+		err = request_threaded_irq(irq, NULL, mv88e6185_pcs_handle_irq,
+					   IRQF_ONESHOT, mpcs->name, mpcs);
+		if (err) {
+			kfree(mpcs);
+			return err;
+		}
+
+		mpcs->irq = irq;
+	} else {
+		mpcs->phylink_pcs.poll = true;
+	}
+
+	chip->ports[port].pcs_private = &mpcs->phylink_pcs;
+
+	return 0;
+}
+
+static void mv88e6185_pcs_teardown(struct mv88e6xxx_chip *chip, int port)
+{
+	struct mv88e6185_pcs *mpcs;
+
+	mpcs = chip->ports[port].pcs_private;
+	if (!mpcs)
+		return;
+
+	if (mpcs->irq)
+		free_irq(mpcs->irq, mpcs);
+
+	kfree(mpcs);
+
+	chip->ports[port].pcs_private = NULL;
+}
+
+static struct phylink_pcs *mv88e6185_pcs_select(struct mv88e6xxx_chip *chip,
+						int port,
+						phy_interface_t interface)
+{
+	return chip->ports[port].pcs_private;
+}
+
+const struct mv88e6xxx_pcs_ops mv88e6185_pcs_ops = {
+	.pcs_init = mv88e6185_pcs_init,
+	.pcs_teardown = mv88e6185_pcs_teardown,
+	.pcs_select = mv88e6185_pcs_select,
+};