ar71xx: ag71xx: add support for getting switch port link status

SVN-Revision: 29017

target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c

@@ -96,6 +96,7 @@
 #define AR7240_REG_PORT_BASE(_port)	(0x100 + (_port) * 0x100)
 
 #define AR7240_REG_PORT_STATUS(_port)	(AR7240_REG_PORT_BASE((_port)) + 0x00)
+#define AR7240_PORT_STATUS_SPEED_S	0
 #define AR7240_PORT_STATUS_SPEED_M	BITM(2)
 #define AR7240_PORT_STATUS_SPEED_10	0
 #define AR7240_PORT_STATUS_SPEED_100	1
@@ -207,6 +208,7 @@ struct ar7240sw {
 	u8 vlan_table[AR7240_MAX_VLANS];
 	u8 vlan_tagged;
 	u16 pvid[AR7240_NUM_PORTS];
+	char buf[80];
 };
 
 struct ar7240sw_hw_stat {
@@ -645,6 +647,63 @@ ar7240_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
 	return 0;
 }
 
+static const char *
+ar7240_speed_str(u32 status)
+{
+	u32 speed;
+
+	speed = (status >> AR7240_PORT_STATUS_SPEED_S) &
+					AR7240_PORT_STATUS_SPEED_M;
+	switch (speed) {
+	case AR7240_PORT_STATUS_SPEED_10:
+		return "10baseT";
+	case AR7240_PORT_STATUS_SPEED_100:
+		return "100baseT";
+	case AR7240_PORT_STATUS_SPEED_1000:
+		return "1000baseT";
+	}
+
+	return "unknown";
+}
+
+static int
+ar7240_port_get_link(struct switch_dev *dev, const struct switch_attr *attr,
+		     struct switch_val *val)
+{
+	struct ar7240sw *as = sw_to_ar7240(dev);
+	struct mii_bus *mii = as->mii_bus;
+	u32 len;
+	u32 status;
+	int port;
+
+	port = val->port_vlan;
+
+	memset(as->buf, '\0', sizeof(as->buf));
+	status = ar7240sw_reg_read(mii, AR7240_REG_PORT_STATUS(port));
+
+	if (status & AR7240_PORT_STATUS_LINK_UP) {
+		len = snprintf(as->buf, sizeof(as->buf),
+				"port:%d link:up speed:%s %s-duplex %s%s%s",
+				port,
+				ar7240_speed_str(status),
+				(status & AR7240_PORT_STATUS_DUPLEX) ?
+					"full" : "half",
+				(status & AR7240_PORT_STATUS_TXFLOW) ?
+					"txflow ": "",
+				(status & AR7240_PORT_STATUS_RXFLOW) ?
+					"rxflow " : "",
+				(status & AR7240_PORT_STATUS_LINK_AUTO) ?
+					"auto ": "");
+	} else {
+		len = snprintf(as->buf, sizeof(as->buf),
+			       "port:%d link:down", port);
+	}
+
+	val->value.s = as->buf;
+	val->len = len;
+
+	return 0;
+}
 
 static void
 ar7240_vtu_op(struct ar7240sw *as, u32 op, u32 val)
@@ -733,6 +792,14 @@ static struct switch_attr ar7240_globals[] = {
 };
 
 static struct switch_attr ar7240_port[] = {
+	{
+		.type = SWITCH_TYPE_STRING,
+		.name = "link",
+		.description = "Get port link information",
+		.max = 1,
+		.set = NULL,
+		.get = ar7240_port_get_link,
+	},
 };
 
 static struct switch_attr ar7240_vlan[] = {