[PATCH net-next 5/6] net: dsa: use swnode fixed-link if using default params

Russell King (Oracle)
2022-07-15T16:02:46Z

Create and use a swnode fixed-link specification for phylink if no
parameters are given in DT for a fixed-link. This allows phylink to
be used for "default" cases for DSA and CPU ports. Enable the use
of phylink in all cases for DSA and CPU ports.

Co-developed by Vladimir Oltean and myself.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
net/dsa/port.c | 152 ++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 139 insertions(+), 13 deletions(-)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 35b4e1f8dc05..abcf7899abf8 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1521,10 +1521,131 @@ static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
.mac_link_up = dsa_port_phylink_mac_link_up,
};

+static struct {
+ unsigned long mask;
+ int speed;
+ int duplex;
+} phylink_caps_params[] = {
+ { MAC_400000FD, SPEED_400000, DUPLEX_FULL },
+ { MAC_200000FD, SPEED_200000, DUPLEX_FULL },
+ { MAC_100000FD, SPEED_100000, DUPLEX_FULL },
+ { MAC_56000FD, SPEED_56000, DUPLEX_FULL },
+ { MAC_50000FD, SPEED_50000, DUPLEX_FULL },
+ { MAC_40000FD, SPEED_40000, DUPLEX_FULL },
+ { MAC_25000FD, SPEED_25000, DUPLEX_FULL },
+ { MAC_20000FD, SPEED_20000, DUPLEX_FULL },
+ { MAC_10000FD, SPEED_10000, DUPLEX_FULL },
+ { MAC_5000FD, SPEED_5000, DUPLEX_FULL },
+ { MAC_2500FD, SPEED_2500, DUPLEX_FULL },
+ { MAC_1000FD, SPEED_1000, DUPLEX_FULL },
+ { MAC_100FD, SPEED_100, DUPLEX_FULL },
+ { MAC_10FD, SPEED_10, DUPLEX_FULL },
+ { MAC_1000HD, SPEED_1000, DUPLEX_HALF },
+ { MAC_100HD, SPEED_100, DUPLEX_HALF },
+ { MAC_10HD, SPEED_10, DUPLEX_HALF },
+};
+
+static int dsa_port_find_max_speed(unsigned long caps, int *speed, int *duplex)
+{
+ int i;
+
+ *speed = SPEED_UNKNOWN;
+ *duplex = DUPLEX_UNKNOWN;
+
+ for (i = 0; i < ARRAY_SIZE(phylink_caps_params); i++) {
+ if (caps & phylink_caps_params[i].mask) {
+ *speed = phylink_caps_params[i].speed;
+ *duplex = phylink_caps_params[i].duplex;
+ break;
+ }
+ }
+
+ return *speed == SPEED_UNKNOWN ? -EINVAL : 0;
+}
+
+static void dsa_port_find_max_caps(struct dsa_port *dp,
+ phy_interface_t *max_interface,
+ unsigned long *max_caps)
+{
+ struct phylink_config *config = &dp->pl_config;
+ phy_interface_t interface;
+ unsigned long caps;
+
+ *max_interface = PHY_INTERFACE_MODE_NA;
+ *max_caps = 0;
+
+ for_each_set_bit(interface, config->supported_interfaces,
+ PHY_INTERFACE_MODE_MAX) {
+ caps = config->mac_capabilities &
+ phylink_interface_to_caps(interface);
+ if (caps > *max_caps) {
+ *max_caps = caps;
+ *max_interface = interface;
+ }
+ }
+}
+
+static struct fwnode_handle *dsa_port_get_fwnode(struct dsa_port *dp,
+ phy_interface_t mode)
+{
+ struct property_entry fixed_link_props[3] = { };
+ struct property_entry port_props[3] = {};
+ struct fwnode_handle *fixed_link_fwnode;
+ struct fwnode_handle *new_port_fwnode;
+ struct device_node *dn = dp->dn;
+ struct device_node *phy_node;
+ int err, speed, duplex;
+ unsigned long caps;
+
+ phy_node = of_parse_phandle(dn, "phy-handle", 0);
+ of_node_put(phy_node);
+ if (phy_node || of_phy_is_fixed_link(dn))
+ /* Nothing broken, nothing to fix.
+ * TODO: As discussed with Russell, maybe phylink could provide
+ * a more comprehensive helper to determine what constitutes a
+ * valid fwnode binding than this guerilla kludge.
+ */
+ return of_fwnode_handle(dn);
+
+ if (mode == PHY_INTERFACE_MODE_NA)
+ dsa_port_find_max_caps(dp, &mode, &caps);
+ else
+ caps = dp->pl_config.mac_capabilities &
+ phylink_interface_to_caps(mode);
+
+ err = dsa_port_find_max_speed(caps, &speed, &duplex);
+ if (err)
+ return ERR_PTR(err);
+
+ fixed_link_props[0] = PROPERTY_ENTRY_U32("speed", speed);
+ if (duplex == DUPLEX_FULL)
+ fixed_link_props[1] = PROPERTY_ENTRY_BOOL("full-duplex");
+
+ port_props[0] = PROPERTY_ENTRY_STRING("phy-mode", phy_modes(mode));
+
+ new_port_fwnode = fwnode_create_software_node(port_props, NULL);
+ if (IS_ERR(new_port_fwnode))
+ return new_port_fwnode;
+
+ /* Node needs to be named so that phylink's call to
+ * fwnode_get_named_child_node() finds it.
+ */
+ fixed_link_fwnode = fwnode_create_named_software_node(fixed_link_props,
+ new_port_fwnode,
+ "fixed-link");
+ if (IS_ERR(fixed_link_fwnode)) {
+ fwnode_remove_software_node(new_port_fwnode);
+ return fixed_link_fwnode;
+ }
+
+ return new_port_fwnode;
+}
+
int dsa_port_phylink_create(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
phy_interface_t mode, def_mode;
+ struct fwnode_handle *fwnode;
int err;

/* Presence of phylink_mac_link_state or phylink_mac_an_restart is
@@ -1552,8 +1673,19 @@ int dsa_port_phylink_create(struct dsa_port *dp)
mode = PHY_INTERFACE_MODE_NA;
}

- dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(dp->dn),
- mode, &dsa_port_phylink_mac_ops);
+ fwnode = dsa_port_get_fwnode(dp, mode);
+ if (IS_ERR(fwnode)) {
+ dev_err(ds->dev,
+ "Failed to get fwnode for port %d: %pe\n",
+ dp->index, fwnode);
+ return PTR_ERR(fwnode);
+ }
+
+ dp->pl = phylink_create(&dp->pl_config, fwnode, mode,
+ &dsa_port_phylink_mac_ops);
+
+ fwnode_remove_software_node(fwnode);
+
if (IS_ERR(dp->pl)) {
pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
return PTR_ERR(dp->pl);
@@ -1663,20 +1795,14 @@ static int dsa_port_phylink_register(struct dsa_port *dp)
int dsa_port_link_register_of(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
- struct device_node *phy_np;
int port = dp->index;

if (!ds->ops->adjust_link) {
- phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
- if (of_phy_is_fixed_link(dp->dn) || phy_np) {
- if (ds->ops->phylink_mac_link_down)
- ds->ops->phylink_mac_link_down(ds, port,
- MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
- of_node_put(phy_np);
- return dsa_port_phylink_register(dp);
- }
- of_node_put(phy_np);
- return 0;
+ if (ds->ops->phylink_mac_link_down)
+ ds->ops->phylink_mac_link_down(ds, port, MLO_AN_FIXED,
+ PHY_INTERFACE_MODE_NA);
+
+ return dsa_port_phylink_register(dp);
}

dev_warn(ds->dev,
--
2.30.2