1 files changed, 406 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
new file mode 100644
index 000000000000..237555845a52
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
@@ -0,0 +1,406 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/netdevice.h>
+#include <linux/phy/phy.h>
+
+#include "lan966x_main.h"
+
+/* Watermark encode */
+#define MULTIPLIER_BIT BIT(8)
+static u32 lan966x_wm_enc(u32 value)
+{
+	value /= LAN966X_BUFFER_CELL_SZ;
+
+	if (value >= MULTIPLIER_BIT) {
+		value /= 16;
+		if (value >= MULTIPLIER_BIT)
+			value = (MULTIPLIER_BIT - 1);
+
+		value |= MULTIPLIER_BIT;
+	}
+
+	return value;
+}
+
+static void lan966x_port_link_down(struct lan966x_port *port)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u32 val, delay = 0;
+
+	/* 0.5: Disable any AFI */
+	lan_rmw(AFI_PORT_CFG_FC_SKIP_TTI_INJ_SET(1) |
+		AFI_PORT_CFG_FRM_OUT_MAX_SET(0),
+		AFI_PORT_CFG_FC_SKIP_TTI_INJ |
+		AFI_PORT_CFG_FRM_OUT_MAX,
+		lan966x, AFI_PORT_CFG(port->chip_port));
+
+	/* wait for reg afi_port_frm_out to become 0 for the port */
+	while (true) {
+		val = lan_rd(lan966x, AFI_PORT_FRM_OUT(port->chip_port));
+		if (!AFI_PORT_FRM_OUT_FRM_OUT_CNT_GET(val))
+			break;
+
+		usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+		delay++;
+		if (delay == 2000) {
+			pr_err("AFI timeout chip port %u", port->chip_port);
+			break;
+		}
+	}
+
+	delay = 0;
+
+	/* 1: Reset the PCS Rx clock domain  */
+	lan_rmw(DEV_CLOCK_CFG_PCS_RX_RST_SET(1),
+		DEV_CLOCK_CFG_PCS_RX_RST,
+		lan966x, DEV_CLOCK_CFG(port->chip_port));
+
+	/* 2: Disable MAC frame reception */
+	lan_rmw(DEV_MAC_ENA_CFG_RX_ENA_SET(0),
+		DEV_MAC_ENA_CFG_RX_ENA,
+		lan966x, DEV_MAC_ENA_CFG(port->chip_port));
+
+	/* 3: Disable traffic being sent to or from switch port */
+	lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(0),
+		QSYS_SW_PORT_MODE_PORT_ENA,
+		lan966x, QSYS_SW_PORT_MODE(port->chip_port));
+
+	/* 4: Disable dequeuing from the egress queues  */
+	lan_rmw(QSYS_PORT_MODE_DEQUEUE_DIS_SET(1),
+		QSYS_PORT_MODE_DEQUEUE_DIS,
+		lan966x, QSYS_PORT_MODE(port->chip_port));
+
+	/* 5: Disable Flowcontrol */
+	lan_rmw(SYS_PAUSE_CFG_PAUSE_ENA_SET(0),
+		SYS_PAUSE_CFG_PAUSE_ENA,
+		lan966x, SYS_PAUSE_CFG(port->chip_port));
+
+	/* 5.1: Disable PFC */
+	lan_rmw(QSYS_SW_PORT_MODE_TX_PFC_ENA_SET(0),
+		QSYS_SW_PORT_MODE_TX_PFC_ENA,
+		lan966x, QSYS_SW_PORT_MODE(port->chip_port));
+
+	/* 6: Wait a worst case time 8ms (jumbo/10Mbit) */
+	usleep_range(8 * USEC_PER_MSEC, 9 * USEC_PER_MSEC);
+
+	/* 7: Disable HDX backpressure */
+	lan_rmw(SYS_FRONT_PORT_MODE_HDX_MODE_SET(0),
+		SYS_FRONT_PORT_MODE_HDX_MODE,
+		lan966x, SYS_FRONT_PORT_MODE(port->chip_port));
+
+	/* 8: Flush the queues accociated with the port */
+	lan_rmw(QSYS_SW_PORT_MODE_AGING_MODE_SET(3),
+		QSYS_SW_PORT_MODE_AGING_MODE,
+		lan966x, QSYS_SW_PORT_MODE(port->chip_port));
+
+	/* 9: Enable dequeuing from the egress queues */
+	lan_rmw(QSYS_PORT_MODE_DEQUEUE_DIS_SET(0),
+		QSYS_PORT_MODE_DEQUEUE_DIS,
+		lan966x, QSYS_PORT_MODE(port->chip_port));
+
+	/* 10: Wait until flushing is complete */
+	while (true) {
+		val = lan_rd(lan966x, QSYS_SW_STATUS(port->chip_port));
+		if (!QSYS_SW_STATUS_EQ_AVAIL_GET(val))
+			break;
+
+		usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+		delay++;
+		if (delay == 2000) {
+			pr_err("Flush timeout chip port %u", port->chip_port);
+			break;
+		}
+	}
+
+	/* 11: Reset the Port and MAC clock domains */
+	lan_rmw(DEV_MAC_ENA_CFG_TX_ENA_SET(0),
+		DEV_MAC_ENA_CFG_TX_ENA,
+		lan966x, DEV_MAC_ENA_CFG(port->chip_port));
+
+	lan_rmw(DEV_CLOCK_CFG_PORT_RST_SET(1),
+		DEV_CLOCK_CFG_PORT_RST,
+		lan966x, DEV_CLOCK_CFG(port->chip_port));
+
+	usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+
+	lan_rmw(DEV_CLOCK_CFG_MAC_TX_RST_SET(1) |
+		DEV_CLOCK_CFG_MAC_RX_RST_SET(1) |
+		DEV_CLOCK_CFG_PORT_RST_SET(1),
+		DEV_CLOCK_CFG_MAC_TX_RST |
+		DEV_CLOCK_CFG_MAC_RX_RST |
+		DEV_CLOCK_CFG_PORT_RST,
+		lan966x, DEV_CLOCK_CFG(port->chip_port));
+
+	/* 12: Clear flushing */
+	lan_rmw(QSYS_SW_PORT_MODE_AGING_MODE_SET(2),
+		QSYS_SW_PORT_MODE_AGING_MODE,
+		lan966x, QSYS_SW_PORT_MODE(port->chip_port));
+
+	/* The port is disabled and flushed, now set up the port in the
+	 * new operating mode
+	 */
+}
+
+static void lan966x_port_link_up(struct lan966x_port *port)
+{
+	struct lan966x_port_config *config = &port->config;
+	struct lan966x *lan966x = port->lan966x;
+	int speed = 0, mode = 0;
+	int atop_wm = 0;
+
+	switch (config->speed) {
+	case SPEED_10:
+		speed = LAN966X_SPEED_10;
+		break;
+	case SPEED_100:
+		speed = LAN966X_SPEED_100;
+		break;
+	case SPEED_1000:
+		speed = LAN966X_SPEED_1000;
+		mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA_SET(1);
+		break;
+	case SPEED_2500:
+		speed = LAN966X_SPEED_2500;
+		mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA_SET(1);
+		break;
+	}
+
+	/* Also the GIGA_MODE_ENA(1) needs to be set regardless of the
+	 * port speed for QSGMII ports.
+	 */
+	if (config->portmode == PHY_INTERFACE_MODE_QSGMII)
+		mode = DEV_MAC_MODE_CFG_GIGA_MODE_ENA_SET(1);
+
+	lan_wr(config->duplex | mode,
+	       lan966x, DEV_MAC_MODE_CFG(port->chip_port));
+
+	lan_rmw(DEV_MAC_IFG_CFG_TX_IFG_SET(config->duplex ? 6 : 5) |
+		DEV_MAC_IFG_CFG_RX_IFG1_SET(config->speed == SPEED_10 ? 2 : 1) |
+		DEV_MAC_IFG_CFG_RX_IFG2_SET(2),
+		DEV_MAC_IFG_CFG_TX_IFG |
+		DEV_MAC_IFG_CFG_RX_IFG1 |
+		DEV_MAC_IFG_CFG_RX_IFG2,
+		lan966x, DEV_MAC_IFG_CFG(port->chip_port));
+
+	lan_rmw(DEV_MAC_HDX_CFG_SEED_SET(4) |
+		DEV_MAC_HDX_CFG_SEED_LOAD_SET(1),
+		DEV_MAC_HDX_CFG_SEED |
+		DEV_MAC_HDX_CFG_SEED_LOAD,
+		lan966x, DEV_MAC_HDX_CFG(port->chip_port));
+
+	if (config->portmode == PHY_INTERFACE_MODE_GMII) {
+		if (config->speed == SPEED_1000)
+			lan_rmw(CHIP_TOP_CUPHY_PORT_CFG_GTX_CLK_ENA_SET(1),
+				CHIP_TOP_CUPHY_PORT_CFG_GTX_CLK_ENA,
+				lan966x,
+				CHIP_TOP_CUPHY_PORT_CFG(port->chip_port));
+		else
+			lan_rmw(CHIP_TOP_CUPHY_PORT_CFG_GTX_CLK_ENA_SET(0),
+				CHIP_TOP_CUPHY_PORT_CFG_GTX_CLK_ENA,
+				lan966x,
+				CHIP_TOP_CUPHY_PORT_CFG(port->chip_port));
+	}
+
+	/* No PFC */
+	lan_wr(ANA_PFC_CFG_FC_LINK_SPEED_SET(speed),
+	       lan966x, ANA_PFC_CFG(port->chip_port));
+
+	lan_rmw(DEV_PCS1G_CFG_PCS_ENA_SET(1),
+		DEV_PCS1G_CFG_PCS_ENA,
+		lan966x, DEV_PCS1G_CFG(port->chip_port));
+
+	lan_rmw(DEV_PCS1G_SD_CFG_SD_ENA_SET(0),
+		DEV_PCS1G_SD_CFG_SD_ENA,
+		lan966x, DEV_PCS1G_SD_CFG(port->chip_port));
+
+	/* Set Pause WM hysteresis, start/stop are in 1518 byte units */
+	lan_wr(SYS_PAUSE_CFG_PAUSE_ENA_SET(1) |
+	       SYS_PAUSE_CFG_PAUSE_STOP_SET(lan966x_wm_enc(4 * 1518)) |
+	       SYS_PAUSE_CFG_PAUSE_START_SET(lan966x_wm_enc(6 * 1518)),
+	       lan966x, SYS_PAUSE_CFG(port->chip_port));
+
+	/* Set SMAC of Pause frame (00:00:00:00:00:00) */
+	lan_wr(0, lan966x, DEV_FC_MAC_LOW_CFG(port->chip_port));
+	lan_wr(0, lan966x, DEV_FC_MAC_HIGH_CFG(port->chip_port));
+
+	/* Flow control */
+	lan_rmw(SYS_MAC_FC_CFG_FC_LINK_SPEED_SET(speed) |
+		SYS_MAC_FC_CFG_FC_LATENCY_CFG_SET(7) |
+		SYS_MAC_FC_CFG_ZERO_PAUSE_ENA_SET(1) |
+		SYS_MAC_FC_CFG_PAUSE_VAL_CFG_SET(0xffff) |
+		SYS_MAC_FC_CFG_RX_FC_ENA_SET(config->pause & MLO_PAUSE_RX ? 1 : 0) |
+		SYS_MAC_FC_CFG_TX_FC_ENA_SET(config->pause & MLO_PAUSE_TX ? 1 : 0),
+		SYS_MAC_FC_CFG_FC_LINK_SPEED |
+		SYS_MAC_FC_CFG_FC_LATENCY_CFG |
+		SYS_MAC_FC_CFG_ZERO_PAUSE_ENA |
+		SYS_MAC_FC_CFG_PAUSE_VAL_CFG |
+		SYS_MAC_FC_CFG_RX_FC_ENA |
+		SYS_MAC_FC_CFG_TX_FC_ENA,
+		lan966x, SYS_MAC_FC_CFG(port->chip_port));
+
+	/* Tail dropping watermark */
+	atop_wm = lan966x->shared_queue_sz;
+
+	/* The total memory size is diveded by number of front ports plus CPU
+	 * port
+	 */
+	lan_wr(lan966x_wm_enc(atop_wm / lan966x->num_phys_ports + 1), lan966x,
+	       SYS_ATOP(port->chip_port));
+	lan_wr(lan966x_wm_enc(atop_wm), lan966x, SYS_ATOP_TOT_CFG);
+
+	/* This needs to be at the end */
+	/* Enable MAC module */
+	lan_wr(DEV_MAC_ENA_CFG_RX_ENA_SET(1) |
+	       DEV_MAC_ENA_CFG_TX_ENA_SET(1),
+	       lan966x, DEV_MAC_ENA_CFG(port->chip_port));
+
+	/* Take out the clock from reset */
+	lan_wr(DEV_CLOCK_CFG_LINK_SPEED_SET(speed),
+	       lan966x, DEV_CLOCK_CFG(port->chip_port));
+
+	/* Core: Enable port for frame transfer */
+	lan_wr(QSYS_SW_PORT_MODE_PORT_ENA_SET(1) |
+	       QSYS_SW_PORT_MODE_SCH_NEXT_CFG_SET(1) |
+	       QSYS_SW_PORT_MODE_INGRESS_DROP_MODE_SET(1),
+	       lan966x, QSYS_SW_PORT_MODE(port->chip_port));
+
+	lan_rmw(AFI_PORT_CFG_FC_SKIP_TTI_INJ_SET(0) |
+		AFI_PORT_CFG_FRM_OUT_MAX_SET(16),
+		AFI_PORT_CFG_FC_SKIP_TTI_INJ |
+		AFI_PORT_CFG_FRM_OUT_MAX,
+		lan966x, AFI_PORT_CFG(port->chip_port));
+}
+
+void lan966x_port_config_down(struct lan966x_port *port)
+{
+	lan966x_port_link_down(port);
+}
+
+void lan966x_port_config_up(struct lan966x_port *port)
+{
+	lan966x_port_link_up(port);
+}
+
+void lan966x_port_status_get(struct lan966x_port *port,
+			     struct phylink_link_state *state)
+{
+	struct lan966x *lan966x = port->lan966x;
+	bool link_down;
+	u16 bmsr = 0;
+	u16 lp_adv;
+	u32 val;
+
+	val = lan_rd(lan966x, DEV_PCS1G_STICKY(port->chip_port));
+	link_down = DEV_PCS1G_STICKY_LINK_DOWN_STICKY_GET(val);
+	if (link_down)
+		lan_wr(val, lan966x, DEV_PCS1G_STICKY(port->chip_port));
+
+	/* Get both current Link and Sync status */
+	val = lan_rd(lan966x, DEV_PCS1G_LINK_STATUS(port->chip_port));
+	state->link = DEV_PCS1G_LINK_STATUS_LINK_STATUS_GET(val) &&
+		      DEV_PCS1G_LINK_STATUS_SYNC_STATUS_GET(val);
+	state->link &= !link_down;
+
+	/* Get PCS ANEG status register */
+	val = lan_rd(lan966x, DEV_PCS1G_ANEG_STATUS(port->chip_port));
+	/* Aneg complete provides more information  */
+	if (DEV_PCS1G_ANEG_STATUS_ANEG_COMPLETE_GET(val)) {
+		state->an_complete = true;
+
+		bmsr |= state->link ? BMSR_LSTATUS : 0;
+		bmsr |= BMSR_ANEGCOMPLETE;
+
+		lp_adv = DEV_PCS1G_ANEG_STATUS_LP_ADV_GET(val);
+		phylink_mii_c22_pcs_decode_state(state, bmsr, lp_adv);
+	} else {
+		if (!state->link)
+			return;
+
+		if (state->interface == PHY_INTERFACE_MODE_1000BASEX)
+			state->speed = SPEED_1000;
+		else if (state->interface == PHY_INTERFACE_MODE_2500BASEX)
+			state->speed = SPEED_2500;
+
+		state->duplex = DUPLEX_FULL;
+	}
+}
+
+int lan966x_port_pcs_set(struct lan966x_port *port,
+			 struct lan966x_port_config *config)
+{
+	struct lan966x *lan966x = port->lan966x;
+	bool inband_aneg = false;
+	bool outband;
+
+	if (config->inband) {
+		if (config->portmode == PHY_INTERFACE_MODE_SGMII ||
+		    config->portmode == PHY_INTERFACE_MODE_QSGMII)
+			inband_aneg = true; /* Cisco-SGMII in-band-aneg */
+		else if (config->portmode == PHY_INTERFACE_MODE_1000BASEX &&
+			 config->autoneg)
+			inband_aneg = true; /* Clause-37 in-band-aneg */
+
+		outband = false;
+	} else {
+		outband = true;
+	}
+
+	/* Disable or enable inband */
+	lan_rmw(DEV_PCS1G_MODE_CFG_SGMII_MODE_ENA_SET(outband),
+		DEV_PCS1G_MODE_CFG_SGMII_MODE_ENA,
+		lan966x, DEV_PCS1G_MODE_CFG(port->chip_port));
+
+	/* Enable PCS */
+	lan_wr(DEV_PCS1G_CFG_PCS_ENA_SET(1),
+	       lan966x, DEV_PCS1G_CFG(port->chip_port));
+
+	if (inband_aneg) {
+		int adv = phylink_mii_c22_pcs_encode_advertisement(config->portmode,
+								   config->advertising);
+		if (adv >= 0)
+			/* Enable in-band aneg */
+			lan_wr(DEV_PCS1G_ANEG_CFG_ADV_ABILITY_SET(adv) |
+			       DEV_PCS1G_ANEG_CFG_SW_RESOLVE_ENA_SET(1) |
+			       DEV_PCS1G_ANEG_CFG_ENA_SET(1) |
+			       DEV_PCS1G_ANEG_CFG_RESTART_ONE_SHOT_SET(1),
+			       lan966x, DEV_PCS1G_ANEG_CFG(port->chip_port));
+	} else {
+		lan_wr(0, lan966x, DEV_PCS1G_ANEG_CFG(port->chip_port));
+	}
+
+	/* Take PCS out of reset */
+	lan_rmw(DEV_CLOCK_CFG_LINK_SPEED_SET(2) |
+		DEV_CLOCK_CFG_PCS_RX_RST_SET(0) |
+		DEV_CLOCK_CFG_PCS_TX_RST_SET(0),
+		DEV_CLOCK_CFG_LINK_SPEED |
+		DEV_CLOCK_CFG_PCS_RX_RST |
+		DEV_CLOCK_CFG_PCS_TX_RST,
+		lan966x, DEV_CLOCK_CFG(port->chip_port));
+
+	port->config = *config;
+
+	return 0;
+}
+
+void lan966x_port_init(struct lan966x_port *port)
+{
+	struct lan966x_port_config *config = &port->config;
+	struct lan966x *lan966x = port->lan966x;
+
+	lan_rmw(ANA_PORT_CFG_LEARN_ENA_SET(0),
+		ANA_PORT_CFG_LEARN_ENA,
+		lan966x, ANA_PORT_CFG(port->chip_port));
+
+	lan966x_port_config_down(port);
+
+	if (config->portmode != PHY_INTERFACE_MODE_QSGMII)
+		return;
+
+	lan_rmw(DEV_CLOCK_CFG_PCS_RX_RST_SET(0) |
+		DEV_CLOCK_CFG_PCS_TX_RST_SET(0) |
+		DEV_CLOCK_CFG_LINK_SPEED_SET(LAN966X_SPEED_1000),
+		DEV_CLOCK_CFG_PCS_RX_RST |
+		DEV_CLOCK_CFG_PCS_TX_RST |
+		DEV_CLOCK_CFG_LINK_SPEED,
+		lan966x, DEV_CLOCK_CFG(port->chip_port));
+}