net: dsa: microchip: add the support for set_ageing_time

KSZ9477 has the 11 bit ageing count value which is split across the two
registers. And LAN937x has the 20 bit ageing count which is also split
into two registers. Each count in the registers represents 1 second.
This patch add the support for ageing time for KSZ9477 and LAN937x
series of switch.

Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 42d7e4c12459..a6a0321a8931 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -963,6 +963,31 @@ void ksz9477_get_caps(struct ksz_device *dev, int port,
 		config->mac_capabilities |= MAC_1000FD;
 }
 
+int ksz9477_set_ageing_time(struct ksz_device *dev, unsigned int msecs)
+{
+	u32 secs = msecs / 1000;
+	u8 value;
+	u8 data;
+	int ret;
+
+	value = FIELD_GET(SW_AGE_PERIOD_7_0_M, secs);
+
+	ret = ksz_write8(dev, REG_SW_LUE_CTRL_3, value);
+	if (ret < 0)
+		return ret;
+
+	data = FIELD_GET(SW_AGE_PERIOD_10_8_M, secs);
+
+	ret = ksz_read8(dev, REG_SW_LUE_CTRL_0, &value);
+	if (ret < 0)
+		return ret;
+
+	value &= ~SW_AGE_CNT_M;
+	value |= FIELD_PREP(SW_AGE_CNT_M, data);
+
+	return ksz_write8(dev, REG_SW_LUE_CTRL_0, value);
+}
+
 void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 {
 	struct dsa_switch *ds = dev->ds;