net: dsa: bcm_sf2: support BCM4908's integrated switch

BCM4908 family SoCs come with integrated Starfighter 2 switch. Its
registers layout it a mix of BCM7278 and BCM7445. It has 5 integrated
PHYs and 8 ports. It also supports RGMII and SerDes.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20210106213202.17459-3-zajec5@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/b53/b53_common.c

@@ -2459,6 +2459,20 @@ static const struct b53_chip_data b53_switch_chips[] = {
 		.jumbo_pm_reg = B53_JUMBO_PORT_MASK,
 		.jumbo_size_reg = B53_JUMBO_MAX_SIZE,
 	},
+	/* Starfighter 2 */
+	{
+		.chip_id = BCM4908_DEVICE_ID,
+		.dev_name = "BCM4908",
+		.vlans = 4096,
+		.enabled_ports = 0x1bf,
+		.arl_bins = 4,
+		.arl_buckets = 256,
+		.cpu_port = 8, /* TODO: ports 4, 5, 8 */
+		.vta_regs = B53_VTA_REGS,
+		.duplex_reg = B53_DUPLEX_STAT_GE,
+		.jumbo_pm_reg = B53_JUMBO_PORT_MASK,
+		.jumbo_size_reg = B53_JUMBO_MAX_SIZE,
+	},
 	{
 		.chip_id = BCM7445_DEVICE_ID,
 		.dev_name = "BCM7445",

drivers/net/dsa/b53/b53_priv.h

@@ -64,6 +64,7 @@ struct b53_io_ops {
 #define B53_INVALID_LANE	0xff
 
 enum {
+	BCM4908_DEVICE_ID = 0x4908,
 	BCM5325_DEVICE_ID = 0x25,
 	BCM5365_DEVICE_ID = 0x65,
 	BCM5389_DEVICE_ID = 0x89,

drivers/net/dsa/bcm_sf2.c

@@ -105,7 +105,8 @@ static void bcm_sf2_imp_setup(struct dsa_switch *ds, int port)
 	b53_brcm_hdr_setup(ds, port);
 
 	if (port == 8) {
-		if (priv->type == BCM7445_DEVICE_ID)
+		if (priv->type == BCM4908_DEVICE_ID ||
+		    priv->type == BCM7445_DEVICE_ID)
 			offset = CORE_STS_OVERRIDE_IMP;
 		else
 			offset = CORE_STS_OVERRIDE_IMP2;
@@ -715,7 +716,8 @@ static void bcm_sf2_sw_mac_link_down(struct dsa_switch *ds, int port,
 	u32 reg, offset;
 
 	if (port != core_readl(priv, CORE_IMP0_PRT_ID)) {
-		if (priv->type == BCM7445_DEVICE_ID)
+		if (priv->type == BCM4908_DEVICE_ID ||
+		    priv->type == BCM7445_DEVICE_ID)
 			offset = CORE_STS_OVERRIDE_GMIIP_PORT(port);
 		else
 			offset = CORE_STS_OVERRIDE_GMIIP2_PORT(port);
@@ -742,7 +744,8 @@ static void bcm_sf2_sw_mac_link_up(struct dsa_switch *ds, int port,
 	bcm_sf2_sw_mac_link_set(ds, port, interface, true);
 
 	if (port != core_readl(priv, CORE_IMP0_PRT_ID)) {
-		if (priv->type == BCM7445_DEVICE_ID)
+		if (priv->type == BCM4908_DEVICE_ID ||
+		    priv->type == BCM7445_DEVICE_ID)
 			offset = CORE_STS_OVERRIDE_GMIIP_PORT(port);
 		else
 			offset = CORE_STS_OVERRIDE_GMIIP2_PORT(port);
@@ -1135,6 +1138,30 @@ struct bcm_sf2_of_data {
 	unsigned int num_cfp_rules;
 };
 
+static const u16 bcm_sf2_4908_reg_offsets[] = {
+	[REG_SWITCH_CNTRL]	= 0x00,
+	[REG_SWITCH_STATUS]	= 0x04,
+	[REG_DIR_DATA_WRITE]	= 0x08,
+	[REG_DIR_DATA_READ]	= 0x0c,
+	[REG_SWITCH_REVISION]	= 0x10,
+	[REG_PHY_REVISION]	= 0x14,
+	[REG_SPHY_CNTRL]	= 0x24,
+	[REG_CROSSBAR]		= 0xc8,
+	[REG_RGMII_0_CNTRL]	= 0xe0,
+	[REG_RGMII_1_CNTRL]	= 0xec,
+	[REG_RGMII_2_CNTRL]	= 0xf8,
+	[REG_LED_0_CNTRL]	= 0x40,
+	[REG_LED_1_CNTRL]	= 0x4c,
+	[REG_LED_2_CNTRL]	= 0x58,
+};
+
+static const struct bcm_sf2_of_data bcm_sf2_4908_data = {
+	.type		= BCM4908_DEVICE_ID,
+	.core_reg_align	= 0,
+	.reg_offsets	= bcm_sf2_4908_reg_offsets,
+	.num_cfp_rules	= 0, /* FIXME */
+};
+
 /* Register offsets for the SWITCH_REG_* block */
 static const u16 bcm_sf2_7445_reg_offsets[] = {
 	[REG_SWITCH_CNTRL]	= 0x00,
@@ -1183,6 +1210,9 @@ static const struct bcm_sf2_of_data bcm_sf2_7278_data = {
 };
 
 static const struct of_device_id bcm_sf2_of_match[] = {
+	{ .compatible = "brcm,bcm4908-switch",
+	  .data = &bcm_sf2_4908_data
+	},
 	{ .compatible = "brcm,bcm7445-switch-v4.0",
 	  .data = &bcm_sf2_7445_data
 	},

drivers/net/dsa/bcm_sf2_regs.h

@@ -17,6 +17,7 @@ enum bcm_sf2_reg_offs {
 	REG_SWITCH_REVISION,
 	REG_PHY_REVISION,
 	REG_SPHY_CNTRL,
+	REG_CROSSBAR,
 	REG_RGMII_0_CNTRL,
 	REG_RGMII_1_CNTRL,
 	REG_RGMII_2_CNTRL,