net: dsa: b53: Fix for brcm tag issue in Cygnus SoC

In the Broadcom Cygnus SoC, the brcm tag needs to be inserted
in between the mac address and the ether type (should use
'DSA_PROTO_TAG_BRCM') for the packets sent to the internal
b53 switch.

Since the Cygnus was added with the BCM58XX device id and the
BCM58XX uses 'DSA_PROTO_TAG_BRCM_PREPEND', the data path is
broken, due to the incorrect brcm tag location.

Add a new b53 device id (BCM583XX) for Cygnus family to fix the
issue. Add the new device id to the BCM58XX family as Cygnus
is similar to the BCM58XX in most other functionalities.

Fixes: 11606039 ("net: dsa: b53: Support prepended Broadcom tags")
Signed-off-by: Arun Parameswaran <arun.parameswaran@broadcom.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Reported-by: Clément Péron <peron.clem@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/b53_common.c

@@ -684,7 +684,8 @@ static int b53_switch_reset(struct b53_device *dev)
 	 * still use this driver as a library and need to perform the reset
 	 * earlier.
 	 */
-	if (dev->chip_id == BCM58XX_DEVICE_ID) {
+	if (dev->chip_id == BCM58XX_DEVICE_ID ||
+	    dev->chip_id == BCM583XX_DEVICE_ID) {
 		b53_read8(dev, B53_CTRL_PAGE, B53_SOFTRESET, &reg);
 		reg |= SW_RST | EN_SW_RST | EN_CH_RST;
 		b53_write8(dev, B53_CTRL_PAGE, B53_SOFTRESET, reg);
@@ -1935,6 +1936,18 @@ static const struct b53_chip_data b53_switch_chips[] = {
 		.jumbo_pm_reg = B53_JUMBO_PORT_MASK,
 		.jumbo_size_reg = B53_JUMBO_MAX_SIZE,
 	},
+	{
+		.chip_id = BCM583XX_DEVICE_ID,
+		.dev_name = "BCM583xx/11360",
+		.vlans = 4096,
+		.enabled_ports = 0x103,
+		.arl_entries = 4,
+		.cpu_port = B53_CPU_PORT,
+		.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

@@ -62,6 +62,7 @@ enum {
 	BCM53018_DEVICE_ID = 0x53018,
 	BCM53019_DEVICE_ID = 0x53019,
 	BCM58XX_DEVICE_ID = 0x5800,
+	BCM583XX_DEVICE_ID = 0x58300,
 	BCM7445_DEVICE_ID = 0x7445,
 	BCM7278_DEVICE_ID = 0x7278,
 };
@@ -181,6 +182,7 @@ static inline int is5301x(struct b53_device *dev)
 static inline int is58xx(struct b53_device *dev)
 {
 	return dev->chip_id == BCM58XX_DEVICE_ID ||
+		dev->chip_id == BCM583XX_DEVICE_ID ||
 		dev->chip_id == BCM7445_DEVICE_ID ||
 		dev->chip_id == BCM7278_DEVICE_ID;
 }

drivers/net/dsa/b53/b53_srab.c

@@ -364,7 +364,7 @@ static const struct of_device_id b53_srab_of_match[] = {
 	{ .compatible = "brcm,bcm53018-srab" },
 	{ .compatible = "brcm,bcm53019-srab" },
 	{ .compatible = "brcm,bcm5301x-srab" },
-	{ .compatible = "brcm,bcm11360-srab", .data = (void *)BCM58XX_DEVICE_ID },
+	{ .compatible = "brcm,bcm11360-srab", .data = (void *)BCM583XX_DEVICE_ID },
 	{ .compatible = "brcm,bcm58522-srab", .data = (void *)BCM58XX_DEVICE_ID },
 	{ .compatible = "brcm,bcm58525-srab", .data = (void *)BCM58XX_DEVICE_ID },
 	{ .compatible = "brcm,bcm58535-srab", .data = (void *)BCM58XX_DEVICE_ID },
@@ -372,7 +372,7 @@ static const struct of_device_id b53_srab_of_match[] = {
 	{ .compatible = "brcm,bcm58623-srab", .data = (void *)BCM58XX_DEVICE_ID },
 	{ .compatible = "brcm,bcm58625-srab", .data = (void *)BCM58XX_DEVICE_ID },
 	{ .compatible = "brcm,bcm88312-srab", .data = (void *)BCM58XX_DEVICE_ID },
-	{ .compatible = "brcm,cygnus-srab", .data = (void *)BCM58XX_DEVICE_ID },
+	{ .compatible = "brcm,cygnus-srab", .data = (void *)BCM583XX_DEVICE_ID },
 	{ .compatible = "brcm,nsp-srab", .data = (void *)BCM58XX_DEVICE_ID },
 	{ /* sentinel */ },
 };