[openwrt/staging/ldir.git] /

From 8255212e4130bd2dc1463286a3dddb74797bbdc1 Mon Sep 17 00:00:00 2001
From: Ansuel Smith <ansuelsmth@gmail.com>
Date: Sat, 16 Apr 2022 01:30:14 +0200
Subject: [PATCH 3/6] net: dsa: qca8k: rework and simplify mdiobus logic

In an attempt to reduce qca8k_priv space, rework and simplify mdiobus
logic.
We now declare a mdiobus instead of relying on DSA phy_read/write even
if a mdio node is not present. This is all to make the qca8k ops static
and not switch specific. With a legacy implementation where port doesn't
have a phy map declared in the dts with a mdio node, we declare a
'qca8k-legacy' mdiobus. The conversion logic is used as legacy read and
write ops are used instead of the internal one.
Also drop the legacy_phy_port_mapping as we now declare mdiobus with ops
that already address the workaround.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/dsa/qca8k.c | 95 +++++++++++++----------------------------
 drivers/net/dsa/qca8k.h |  1 -
 2 files changed, 29 insertions(+), 67 deletions(-)

--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1291,83 +1291,63 @@ qca8k_internal_mdio_read(struct mii_bus
 }
 
 static int
-qca8k_phy_write(struct dsa_switch *ds, int port, int regnum, u16 data)
+qca8k_legacy_mdio_write(struct mii_bus *slave_bus, int port, int regnum, u16 data)
 {
-       struct qca8k_priv *priv = ds->priv;
-       int ret;
+       port = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
 
-       /* Check if the legacy mapping should be used and the
-        * port is not correctly mapped to the right PHY in the
-        * devicetree
-        */
-       if (priv->legacy_phy_port_mapping)
-               port = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
-
-       /* Use mdio Ethernet when available, fallback to legacy one on error */
-       ret = qca8k_phy_eth_command(priv, false, port, regnum, 0);
-       if (!ret)
-               return ret;
-
-       return qca8k_mdio_write(priv, port, regnum, data);
+       return qca8k_internal_mdio_write(slave_bus, port, regnum, data);
 }
 
 static int
-qca8k_phy_read(struct dsa_switch *ds, int port, int regnum)
+qca8k_legacy_mdio_read(struct mii_bus *slave_bus, int port, int regnum)
 {
-       struct qca8k_priv *priv = ds->priv;
-       int ret;
-
-       /* Check if the legacy mapping should be used and the
-        * port is not correctly mapped to the right PHY in the
-        * devicetree
-        */
-       if (priv->legacy_phy_port_mapping)
-               port = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
-
-       /* Use mdio Ethernet when available, fallback to legacy one on error */
-       ret = qca8k_phy_eth_command(priv, true, port, regnum, 0);
-       if (ret >= 0)
-               return ret;
-
-       ret = qca8k_mdio_read(priv, port, regnum);
-
-       if (ret < 0)
-               return 0xffff;
+       port = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
 
-       return ret;
+       return qca8k_internal_mdio_read(slave_bus, port, regnum);
 }
 
 static int
-qca8k_mdio_register(struct qca8k_priv *priv, struct device_node *mdio)
+qca8k_mdio_register(struct qca8k_priv *priv)
 {
        struct dsa_switch *ds = priv->ds;
+       struct device_node *mdio;
        struct mii_bus *bus;
 
        bus = devm_mdiobus_alloc(ds->dev);
-
        if (!bus)
                return -ENOMEM;
 
        bus->priv = (void *)priv;
-       bus->name = "qca8k slave mii";
-       bus->read = qca8k_internal_mdio_read;
-       bus->write = qca8k_internal_mdio_write;
-       snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d",
-                ds->index);
-
        bus->parent = ds->dev;
        bus->phy_mask = ~ds->phys_mii_mask;
-
        ds->slave_mii_bus = bus;
 
-       return devm_of_mdiobus_register(priv->dev, bus, mdio);
+       /* Check if the devicetree declare the port:phy mapping */
+       mdio = of_get_child_by_name(priv->dev->of_node, "mdio");
+       if (of_device_is_available(mdio)) {
+               snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d", ds->index);
+               bus->name = "qca8k slave mii";
+               bus->read = qca8k_internal_mdio_read;
+               bus->write = qca8k_internal_mdio_write;
+               return devm_of_mdiobus_register(priv->dev, bus, mdio);
+       }
+
+       /* If a mapping can't be found the legacy mapping is used,
+        * using the qca8k_port_to_phy function
+        */
+       snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d.%d",
+                ds->dst->index, ds->index);
+       bus->name = "qca8k-legacy slave mii";
+       bus->read = qca8k_legacy_mdio_read;
+       bus->write = qca8k_legacy_mdio_write;
+       return devm_mdiobus_register(priv->dev, bus);
 }
 
 static int
 qca8k_setup_mdio_bus(struct qca8k_priv *priv)
 {
        u32 internal_mdio_mask = 0, external_mdio_mask = 0, reg;
-       struct device_node *ports, *port, *mdio;
+       struct device_node *ports, *port;
        phy_interface_t mode;
        int err;
 
@@ -1429,24 +1409,7 @@ qca8k_setup_mdio_bus(struct qca8k_priv *
                                         QCA8K_MDIO_MASTER_EN);
        }
 
-       /* Check if the devicetree declare the port:phy mapping */
-       mdio = of_get_child_by_name(priv->dev->of_node, "mdio");
-       if (of_device_is_available(mdio)) {
-               err = qca8k_mdio_register(priv, mdio);
-               if (err)
-                       of_node_put(mdio);
-
-               return err;
-       }
-
-       /* If a mapping can't be found the legacy mapping is used,
-        * using the qca8k_port_to_phy function
-        */
-       priv->legacy_phy_port_mapping = true;
-       priv->ops.phy_read = qca8k_phy_read;
-       priv->ops.phy_write = qca8k_phy_write;
-
-       return 0;
+       return qca8k_mdio_register(priv);
 }
 
 static int
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -382,7 +382,6 @@ struct qca8k_priv {
         * Bit 1: port enabled. Bit 0: port disabled.
         */
        u8 port_enabled_map;
-       bool legacy_phy_port_mapping;
        struct qca8k_ports_config ports_config;
        struct regmap *regmap;
        struct mii_bus *bus;