net: dsa: microchip: Add KSZ8895/KSZ8864 switch support

KSZ8895/KSZ8864 is a switch family between KSZ8863/73 and KSZ8795, so it
shares some registers and functions in those switches already
implemented in the KSZ DSA driver.

Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
Tested-by: Pieter Van Trappen <pieter.van.trappen@cern.ch>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/microchip/ksz8795.c

@@ -188,6 +188,8 @@ int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu)
 	case KSZ8765_CHIP_ID:
 		return ksz8795_change_mtu(dev, frame_size);
 	case KSZ8830_CHIP_ID:
+	case KSZ8864_CHIP_ID:
+	case KSZ8895_CHIP_ID:
 		return ksz8863_change_mtu(dev, frame_size);
 	}
 
@@ -384,15 +386,15 @@ static void ksz8863_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
 void ksz8_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
 		    u64 *dropped, u64 *cnt)
 {
-	if (ksz_is_ksz88x3(dev))
+	if (is_ksz88xx(dev))
 		ksz8863_r_mib_pkt(dev, port, addr, dropped, cnt);
 	else
 		ksz8795_r_mib_pkt(dev, port, addr, dropped, cnt);
 }
 
 void ksz8_freeze_mib(struct ksz_device *dev, int port, bool freeze)
 {
-	if (ksz_is_ksz88x3(dev))
+	if (is_ksz88xx(dev))
 		return;
 
 	/* enable the port for flush/freeze function */
@@ -410,7 +412,8 @@ void ksz8_port_init_cnt(struct ksz_device *dev, int port)
 	struct ksz_port_mib *mib = &dev->ports[port].mib;
 	u64 *dropped;
 
-	if (!ksz_is_ksz88x3(dev)) {
+	/* For KSZ8795 family. */
+	if (ksz_is_ksz87xx(dev)) {
 		/* flush all enabled port MIB counters */
 		ksz_cfg(dev, REG_SW_CTRL_6, BIT(port), true);
 		ksz_cfg(dev, REG_SW_CTRL_6, SW_MIB_COUNTER_FLUSH, true);
@@ -609,11 +612,11 @@ static int ksz8_r_sta_mac_table(struct ksz_device *dev, u16 addr,
 			shifts[STATIC_MAC_FWD_PORTS];
 	alu->is_override = (data_hi & masks[STATIC_MAC_TABLE_OVERRIDE]) ? 1 : 0;
 
-	/* KSZ8795 family switches have STATIC_MAC_TABLE_USE_FID and
+	/* KSZ8795/KSZ8895 family switches have STATIC_MAC_TABLE_USE_FID and
 	 * STATIC_MAC_TABLE_FID definitions off by 1 when doing read on the
 	 * static MAC table compared to doing write.
 	 */
-	if (ksz_is_ksz87xx(dev))
+	if (ksz_is_ksz87xx(dev) || ksz_is_8895_family(dev))
 		data_hi >>= 1;
 	alu->is_static = true;
 	alu->is_use_fid = (data_hi & masks[STATIC_MAC_TABLE_USE_FID]) ? 1 : 0;
@@ -1692,7 +1695,8 @@ void ksz8_config_cpu_port(struct dsa_switch *ds)
 	for (i = 0; i < dev->phy_port_cnt; i++) {
 		p = &dev->ports[i];
 
-		if (!ksz_is_ksz88x3(dev)) {
+		/* For KSZ8795 family. */
+		if (ksz_is_ksz87xx(dev)) {
 			ksz_pread8(dev, i, regs[P_REMOTE_STATUS], &remote);
 			if (remote & KSZ8_PORT_FIBER_MODE)
 				p->fiber = 1;

drivers/net/dsa/microchip/ksz_common.c

@@ -2,7 +2,7 @@
 /*
  * Microchip switch driver main logic
  *
- * Copyright (C) 2017-2019 Microchip Technology Inc.
+ * Copyright (C) 2017-2024 Microchip Technology Inc.
  */
 
 #include <linux/delay.h>
@@ -277,7 +277,7 @@ static const struct phylink_mac_ops ksz8_phylink_mac_ops = {
 	.mac_link_up	= ksz8_phylink_mac_link_up,
 };
 
-static const struct ksz_dev_ops ksz88x3_dev_ops = {
+static const struct ksz_dev_ops ksz88xx_dev_ops = {
 	.setup = ksz8_setup,
 	.get_port_addr = ksz8_get_port_addr,
 	.cfg_port_member = ksz8_cfg_port_member,
@@ -572,6 +572,61 @@ static u8 ksz8863_shifts[] = {
 	[DYNAMIC_MAC_SRC_PORT]		= 20,
 };
 
+static const u16 ksz8895_regs[] = {
+	[REG_SW_MAC_ADDR]		= 0x68,
+	[REG_IND_CTRL_0]		= 0x6E,
+	[REG_IND_DATA_8]		= 0x70,
+	[REG_IND_DATA_CHECK]		= 0x72,
+	[REG_IND_DATA_HI]		= 0x71,
+	[REG_IND_DATA_LO]		= 0x75,
+	[REG_IND_MIB_CHECK]		= 0x75,
+	[P_FORCE_CTRL]			= 0x0C,
+	[P_LINK_STATUS]			= 0x0E,
+	[P_LOCAL_CTRL]			= 0x0C,
+	[P_NEG_RESTART_CTRL]		= 0x0D,
+	[P_REMOTE_STATUS]		= 0x0E,
+	[P_SPEED_STATUS]		= 0x09,
+	[S_TAIL_TAG_CTRL]		= 0x0C,
+	[P_STP_CTRL]			= 0x02,
+	[S_START_CTRL]			= 0x01,
+	[S_BROADCAST_CTRL]		= 0x06,
+	[S_MULTICAST_CTRL]		= 0x04,
+};
+
+static const u32 ksz8895_masks[] = {
+	[PORT_802_1P_REMAPPING]		= BIT(7),
+	[SW_TAIL_TAG_ENABLE]		= BIT(1),
+	[MIB_COUNTER_OVERFLOW]		= BIT(7),
+	[MIB_COUNTER_VALID]		= BIT(6),
+	[VLAN_TABLE_FID]		= GENMASK(6, 0),
+	[VLAN_TABLE_MEMBERSHIP]		= GENMASK(11, 7),
+	[VLAN_TABLE_VALID]		= BIT(12),
+	[STATIC_MAC_TABLE_VALID]	= BIT(21),
+	[STATIC_MAC_TABLE_USE_FID]	= BIT(23),
+	[STATIC_MAC_TABLE_FID]		= GENMASK(30, 24),
+	[STATIC_MAC_TABLE_OVERRIDE]	= BIT(22),
+	[STATIC_MAC_TABLE_FWD_PORTS]	= GENMASK(20, 16),
+	[DYNAMIC_MAC_TABLE_ENTRIES_H]	= GENMASK(6, 0),
+	[DYNAMIC_MAC_TABLE_MAC_EMPTY]	= BIT(7),
+	[DYNAMIC_MAC_TABLE_NOT_READY]	= BIT(7),
+	[DYNAMIC_MAC_TABLE_ENTRIES]	= GENMASK(31, 29),
+	[DYNAMIC_MAC_TABLE_FID]		= GENMASK(22, 16),
+	[DYNAMIC_MAC_TABLE_SRC_PORT]	= GENMASK(26, 24),
+	[DYNAMIC_MAC_TABLE_TIMESTAMP]	= GENMASK(28, 27),
+};
+
+static const u8 ksz8895_shifts[] = {
+	[VLAN_TABLE_MEMBERSHIP_S]	= 7,
+	[VLAN_TABLE]			= 13,
+	[STATIC_MAC_FWD_PORTS]		= 16,
+	[STATIC_MAC_FID]		= 24,
+	[DYNAMIC_MAC_ENTRIES_H]		= 3,
+	[DYNAMIC_MAC_ENTRIES]		= 29,
+	[DYNAMIC_MAC_FID]		= 16,
+	[DYNAMIC_MAC_TIMESTAMP]		= 27,
+	[DYNAMIC_MAC_SRC_PORT]		= 24,
+};
+
 static const u16 ksz9477_regs[] = {
 	[REG_SW_MAC_ADDR]		= 0x0302,
 	[P_STP_CTRL]			= 0x0B04,
@@ -1397,7 +1452,7 @@ const struct ksz_chip_data ksz_switch_chips[] = {
 		.port_cnt = 3,
 		.num_tx_queues = 4,
 		.num_ipms = 4,
-		.ops = &ksz88x3_dev_ops,
+		.ops = &ksz88xx_dev_ops,
 		.phylink_mac_ops = &ksz8830_phylink_mac_ops,
 		.mib_names = ksz88xx_mib_names,
 		.mib_cnt = ARRAY_SIZE(ksz88xx_mib_names),
@@ -1412,6 +1467,61 @@ const struct ksz_chip_data ksz_switch_chips[] = {
 		.rd_table = &ksz8873_register_set,
 	},
 
+	[KSZ8864] = {
+		/* WARNING
+		 * =======
+		 * KSZ8864 is similar to KSZ8895, except the first port
+		 * does not exist.
+		 *           external  cpu
+		 * KSZ8864   1,2,3      4
+		 * KSZ8895   0,1,2,3    4
+		 * port_cnt is configured as 5, even though it is 4
+		 */
+		.chip_id = KSZ8864_CHIP_ID,
+		.dev_name = "KSZ8864",
+		.num_vlans = 4096,
+		.num_alus = 0,
+		.num_statics = 32,
+		.cpu_ports = 0x10,	/* can be configured as cpu port */
+		.port_cnt = 5,		/* total cpu and user ports */
+		.num_tx_queues = 4,
+		.num_ipms = 4,
+		.ops = &ksz88xx_dev_ops,
+		.phylink_mac_ops = &ksz8830_phylink_mac_ops,
+		.mib_names = ksz88xx_mib_names,
+		.mib_cnt = ARRAY_SIZE(ksz88xx_mib_names),
+		.reg_mib_cnt = MIB_COUNTER_NUM,
+		.regs = ksz8895_regs,
+		.masks = ksz8895_masks,
+		.shifts = ksz8895_shifts,
+		.supports_mii = {false, false, false, false, true},
+		.supports_rmii = {false, false, false, false, true},
+		.internal_phy = {false, true, true, true, false},
+	},
+
+	[KSZ8895] = {
+		.chip_id = KSZ8895_CHIP_ID,
+		.dev_name = "KSZ8895",
+		.num_vlans = 4096,
+		.num_alus = 0,
+		.num_statics = 32,
+		.cpu_ports = 0x10,	/* can be configured as cpu port */
+		.port_cnt = 5,		/* total cpu and user ports */
+		.num_tx_queues = 4,
+		.num_ipms = 4,
+		.ops = &ksz88xx_dev_ops,
+		.phylink_mac_ops = &ksz8830_phylink_mac_ops,
+		.mib_names = ksz88xx_mib_names,
+		.mib_cnt = ARRAY_SIZE(ksz88xx_mib_names),
+		.reg_mib_cnt = MIB_COUNTER_NUM,
+		.regs = ksz8895_regs,
+		.masks = ksz8895_masks,
+		.shifts = ksz8895_shifts,
+		.supports_mii = {false, false, false, false, true},
+		.supports_rmii = {false, false, false, false, true},
+		.internal_phy = {true, true, true, true, false},
+	},
+
 	[KSZ9477] = {
 		.chip_id = KSZ9477_CHIP_ID,
 		.dev_name = "KSZ9477",
@@ -2937,9 +3047,7 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
 	struct ksz_device *dev = ds->priv;
 	enum dsa_tag_protocol proto = DSA_TAG_PROTO_NONE;
 
-	if (dev->chip_id == KSZ8795_CHIP_ID ||
-	    dev->chip_id == KSZ8794_CHIP_ID ||
-	    dev->chip_id == KSZ8765_CHIP_ID)
+	if (ksz_is_ksz87xx(dev) || ksz_is_8895_family(dev))
 		proto = DSA_TAG_PROTO_KSZ8795;
 
 	if (dev->chip_id == KSZ8830_CHIP_ID ||
@@ -3055,6 +3163,8 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
 	case KSZ8765_CHIP_ID:
 		return KSZ8795_HUGE_PACKET_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN;
 	case KSZ8830_CHIP_ID:
+	case KSZ8864_CHIP_ID:
+	case KSZ8895_CHIP_ID:
 		return KSZ8863_HUGE_PACKET_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN;
 	case KSZ8563_CHIP_ID:
 	case KSZ8567_CHIP_ID:
@@ -3412,6 +3522,18 @@ static int ksz_switch_detect(struct ksz_device *dev)
 		else
 			return -ENODEV;
 		break;
+	case KSZ8895_FAMILY_ID:
+		if (id2 == KSZ8895_CHIP_ID_95 ||
+		    id2 == KSZ8895_CHIP_ID_95R)
+			dev->chip_id = KSZ8895_CHIP_ID;
+		else
+			return -ENODEV;
+		ret = ksz_read8(dev, REG_KSZ8864_CHIP_ID, &id4);
+		if (ret)
+			return ret;
+		if (id4 & SW_KSZ8864)
+			dev->chip_id = KSZ8864_CHIP_ID;
+		break;
 	default:
 		ret = ksz_read32(dev, REG_CHIP_ID0, &id32);
 		if (ret)

drivers/net/dsa/microchip/ksz_common.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Microchip switch driver common header
  *
- * Copyright (C) 2017-2019 Microchip Technology Inc.
+ * Copyright (C) 2017-2024 Microchip Technology Inc.
  */
 
 #ifndef __KSZ_COMMON_H
@@ -201,6 +201,8 @@ enum ksz_model {
 	KSZ8794,
 	KSZ8765,
 	KSZ8830,
+	KSZ8864,
+	KSZ8895,
 	KSZ9477,
 	KSZ9896,
 	KSZ9897,
@@ -629,9 +631,21 @@ static inline bool ksz_is_ksz88x3(struct ksz_device *dev)
 	return dev->chip_id == KSZ8830_CHIP_ID;
 }
 
+static inline bool ksz_is_8895_family(struct ksz_device *dev)
+{
+	return dev->chip_id == KSZ8895_CHIP_ID ||
+	       dev->chip_id == KSZ8864_CHIP_ID;
+}
+
 static inline bool is_ksz8(struct ksz_device *dev)
 {
-	return ksz_is_ksz87xx(dev) || ksz_is_ksz88x3(dev);
+	return ksz_is_ksz87xx(dev) || ksz_is_ksz88x3(dev) ||
+	       ksz_is_8895_family(dev);
+}
+
+static inline bool is_ksz88xx(struct ksz_device *dev)
+{
+	return ksz_is_ksz88x3(dev) || ksz_is_8895_family(dev);
 }
 
 static inline bool is_ksz9477(struct ksz_device *dev)
@@ -665,6 +679,7 @@ static inline bool is_lan937x_tx_phy(struct ksz_device *dev, int port)
 #define SW_FAMILY_ID_M			GENMASK(15, 8)
 #define KSZ87_FAMILY_ID			0x87
 #define KSZ88_FAMILY_ID			0x88
+#define KSZ8895_FAMILY_ID		0x95
 
 #define KSZ8_PORT_STATUS_0		0x08
 #define KSZ8_PORT_FIBER_MODE		BIT(7)
@@ -673,6 +688,12 @@ static inline bool is_lan937x_tx_phy(struct ksz_device *dev, int port)
 #define KSZ87_CHIP_ID_94		0x6
 #define KSZ87_CHIP_ID_95		0x9
 #define KSZ88_CHIP_ID_63		0x3
+#define KSZ8895_CHIP_ID_95		0x4
+#define KSZ8895_CHIP_ID_95R		0x6
+
+/* KSZ8895 specific register */
+#define REG_KSZ8864_CHIP_ID		0xFE
+#define SW_KSZ8864			BIT(7)
 
 #define SW_REV_ID_M			GENMASK(7, 4)
 

drivers/net/dsa/microchip/ksz_dcb.c

@@ -113,7 +113,7 @@ static void ksz_get_default_port_prio_reg(struct ksz_device *dev, int *reg,
 static void ksz_get_dscp_prio_reg(struct ksz_device *dev, int *reg,
 				  int *per_reg, u8 *mask)
 {
-	if (ksz_is_ksz87xx(dev)) {
+	if (ksz_is_ksz87xx(dev) || ksz_is_8895_family(dev)) {
 		*reg = KSZ8765_REG_TOS_DSCP_CTRL;
 		*per_reg = 4;
 		*mask = GENMASK(1, 0);

drivers/net/dsa/microchip/ksz_spi.c

@@ -2,7 +2,7 @@
 /*
  * Microchip ksz series register access through SPI
  *
- * Copyright (C) 2017 Microchip Technology Inc.
+ * Copyright (C) 2017-2024 Microchip Technology Inc.
  *	Tristram Ha <Tristram.Ha@microchip.com>
  */
 
@@ -60,6 +60,9 @@ static int ksz_spi_probe(struct spi_device *spi)
 		 chip->chip_id == KSZ8794_CHIP_ID ||
 		 chip->chip_id == KSZ8765_CHIP_ID)
 		regmap_config = ksz8795_regmap_config;
+	else if (chip->chip_id == KSZ8895_CHIP_ID ||
+		 chip->chip_id == KSZ8864_CHIP_ID)
+		regmap_config = ksz8863_regmap_config;
 	else
 		regmap_config = ksz9477_regmap_config;
 
@@ -136,10 +139,18 @@ static const struct of_device_id ksz_dt_ids[] = {
 		.compatible = "microchip,ksz8863",
 		.data = &ksz_switch_chips[KSZ8830]
 	},
+	{
+		.compatible = "microchip,ksz8864",
+		.data = &ksz_switch_chips[KSZ8864]
+	},
 	{
 		.compatible = "microchip,ksz8873",
 		.data = &ksz_switch_chips[KSZ8830]
 	},
+	{
+		.compatible = "microchip,ksz8895",
+		.data = &ksz_switch_chips[KSZ8895]
+	},
 	{
 		.compatible = "microchip,ksz9477",
 		.data = &ksz_switch_chips[KSZ9477]
@@ -201,7 +212,9 @@ static const struct spi_device_id ksz_spi_ids[] = {
 	{ "ksz8794" },
 	{ "ksz8795" },
 	{ "ksz8863" },
+	{ "ksz8864" },
 	{ "ksz8873" },
+	{ "ksz8895" },
 	{ "ksz9477" },
 	{ "ksz9896" },
 	{ "ksz9897" },

include/linux/platform_data/microchip-ksz.h

@@ -28,6 +28,8 @@ enum ksz_chip_id {
 	KSZ8794_CHIP_ID = 0x8794,
 	KSZ8765_CHIP_ID = 0x8765,
 	KSZ8830_CHIP_ID = 0x8830,
+	KSZ8864_CHIP_ID = 0x8864,
+	KSZ8895_CHIP_ID = 0x8895,
 	KSZ9477_CHIP_ID = 0x00947700,
 	KSZ9896_CHIP_ID = 0x00989600,
 	KSZ9897_CHIP_ID = 0x00989700,