[PATCH net-next v5 2/8] net: dsa: microchip: ksz8795: add phylink support

From: Oleksij Rempel
Date: Mon Jun 14 2021 - 00:32:03 EST


From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>

This patch adds the phylink support to the ksz8795 driver to provide
configuration exceptions on quirky KSZ8863 and KSZ8873 ports.

Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
---
drivers/net/dsa/microchip/ksz8795.c | 55 +++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index ba065003623f..cfa2a5000cd3 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -18,6 +18,7 @@
#include <linux/micrel_phy.h>
#include <net/dsa.h>
#include <net/switchdev.h>
+#include <linux/phylink.h>

#include "ksz_common.h"
#include "ksz8795_reg.h"
@@ -1420,11 +1421,65 @@ static int ksz8_setup(struct dsa_switch *ds)
return 0;
}

+static void ksz8_validate(struct dsa_switch *ds, int port,
+ unsigned long *supported,
+ struct phylink_link_state *state)
+{
+ __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+ struct ksz_device *dev = ds->priv;
+
+ if (port == dev->cpu_port) {
+ if (state->interface != PHY_INTERFACE_MODE_RMII &&
+ state->interface != PHY_INTERFACE_MODE_MII &&
+ state->interface != PHY_INTERFACE_MODE_NA)
+ goto unsupported;
+ } else {
+ if (state->interface != PHY_INTERFACE_MODE_INTERNAL &&
+ state->interface != PHY_INTERFACE_MODE_NA)
+ goto unsupported;
+ }
+
+ /* Allow all the expected bits */
+ phylink_set_port_modes(mask);
+ phylink_set(mask, Autoneg);
+
+ /* Silicon Errata Sheet (DS80000830A):
+ * "Port 1 does not respond to received flow control PAUSE frames"
+ * So, disable Pause support on "Port 1" (port == 0) for all ksz88x3
+ * switches.
+ */
+ if (!ksz_is_ksz88x3(dev) || port)
+ phylink_set(mask, Pause);
+
+ /* Asym pause is not supported on KSZ8863 and KSZ8873 */
+ if (!ksz_is_ksz88x3(dev))
+ phylink_set(mask, Asym_Pause);
+
+ /* 10M and 100M are only supported */
+ phylink_set(mask, 10baseT_Half);
+ phylink_set(mask, 10baseT_Full);
+ phylink_set(mask, 100baseT_Half);
+ phylink_set(mask, 100baseT_Full);
+
+ bitmap_and(supported, supported, mask,
+ __ETHTOOL_LINK_MODE_MASK_NBITS);
+ bitmap_and(state->advertising, state->advertising, mask,
+ __ETHTOOL_LINK_MODE_MASK_NBITS);
+
+ return;
+
+unsupported:
+ bitmap_zero(supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
+ dev_err(ds->dev, "Unsupported interface: %s, port: %d\n",
+ phy_modes(state->interface), port);
+}
+
static const struct dsa_switch_ops ksz8_switch_ops = {
.get_tag_protocol = ksz8_get_tag_protocol,
.setup = ksz8_setup,
.phy_read = ksz_phy_read16,
.phy_write = ksz_phy_write16,
+ .phylink_validate = ksz8_validate,
.phylink_mac_link_down = ksz_mac_link_down,
.port_enable = ksz_enable_port,
.get_strings = ksz8_get_strings,
--
2.29.2