net: lan966x: add mactable support

This patch adds support for MAC table operations like add and forget.
Also add the functionality to read the MAC address from DT, if there is
no MAC set in DT it would use a random one.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 101 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
new file mode 100644
index 000000000000..f6878b9f57ef
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+#define LAN966X_MAC_COLUMNS		4
+#define MACACCESS_CMD_IDLE		0
+#define MACACCESS_CMD_LEARN		1
+#define MACACCESS_CMD_FORGET		2
+#define MACACCESS_CMD_AGE		3
+#define MACACCESS_CMD_GET_NEXT		4
+#define MACACCESS_CMD_INIT		5
+#define MACACCESS_CMD_READ		6
+#define MACACCESS_CMD_WRITE		7
+#define MACACCESS_CMD_SYNC_GET_NEXT	8
+
+static int lan966x_mac_get_status(struct lan966x *lan966x)
+{
+	return lan_rd(lan966x, ANA_MACACCESS);
+}
+
+static int lan966x_mac_wait_for_completion(struct lan966x *lan966x)
+{
+	u32 val;
+
+	return readx_poll_timeout(lan966x_mac_get_status,
+		lan966x, val,
+		(ANA_MACACCESS_MAC_TABLE_CMD_GET(val)) ==
+		MACACCESS_CMD_IDLE,
+		TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
+}
+
+static void lan966x_mac_select(struct lan966x *lan966x,
+			       const unsigned char mac[ETH_ALEN],
+			       unsigned int vid)
+{
+	u32 macl = 0, mach = 0;
+
+	/* Set the MAC address to handle and the vlan associated in a format
+	 * understood by the hardware.
+	 */
+	mach |= vid    << 16;
+	mach |= mac[0] << 8;
+	mach |= mac[1] << 0;
+	macl |= mac[2] << 24;
+	macl |= mac[3] << 16;
+	macl |= mac[4] << 8;
+	macl |= mac[5] << 0;
+
+	lan_wr(macl, lan966x, ANA_MACLDATA);
+	lan_wr(mach, lan966x, ANA_MACHDATA);
+}
+
+int lan966x_mac_learn(struct lan966x *lan966x, int port,
+		      const unsigned char mac[ETH_ALEN],
+		      unsigned int vid,
+		      enum macaccess_entry_type type)
+{
+	lan966x_mac_select(lan966x, mac, vid);
+
+	/* Issue a write command */
+	lan_wr(ANA_MACACCESS_VALID_SET(1) |
+	       ANA_MACACCESS_CHANGE2SW_SET(0) |
+	       ANA_MACACCESS_DEST_IDX_SET(port) |
+	       ANA_MACACCESS_ENTRYTYPE_SET(type) |
+	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN),
+	       lan966x, ANA_MACACCESS);
+
+	return lan966x_mac_wait_for_completion(lan966x);
+}
+
+int lan966x_mac_forget(struct lan966x *lan966x,
+		       const unsigned char mac[ETH_ALEN],
+		       unsigned int vid,
+		       enum macaccess_entry_type type)
+{
+	lan966x_mac_select(lan966x, mac, vid);
+
+	/* Issue a forget command */
+	lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
+	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_FORGET),
+	       lan966x, ANA_MACACCESS);
+
+	return lan966x_mac_wait_for_completion(lan966x);
+}
+
+int lan966x_mac_cpu_learn(struct lan966x *lan966x, const char *addr, u16 vid)
+{
+	return lan966x_mac_learn(lan966x, PGID_CPU, addr, vid, ENTRYTYPE_LOCKED);
+}
+
+int lan966x_mac_cpu_forget(struct lan966x *lan966x, const char *addr, u16 vid)
+{
+	return lan966x_mac_forget(lan966x, addr, vid, ENTRYTYPE_LOCKED);
+}
+
+void lan966x_mac_init(struct lan966x *lan966x)
+{
+	/* Clear the MAC table */
+	lan_wr(MACACCESS_CMD_INIT, lan966x, ANA_MACACCESS);
+	lan966x_mac_wait_for_completion(lan966x);
+}