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net: dsa: qca8k: add support for internal phy and internal mdio

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Add support to setup_mdio_bus for internal phy declaration. Introduce a
flag to use the legacy port phy mapping by default and use the direct
mapping if a mdio node is detected in the switch node. Register a
dedicated mdio internal mdio bus to address the different mapping
between port and phy if the mdio node is detected.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ansuel Smith 2021-05-14 23:00:10 +02:00 committed by David S. Miller
parent 617960d72e
commit 759bafb8a3
2 changed files with 83 additions and 30 deletions
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112
drivers/net/dsa/qca8k.c
View File

@ -11,6 +11,7 @@
#include <linux/netdevice.h>
#include <net/dsa.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/if_bridge.h>
#include <linux/mdio.h>
@ -629,7 +630,7 @@ qca8k_port_to_phy(int port)
}
static int
qca8k_mdio_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
qca8k_mdio_busy_wait(struct mii_bus *bus, u32 reg, u32 mask)
{
u16 r1, r2, page;
u32 val;
@ -639,7 +640,7 @@ qca8k_mdio_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
ret = read_poll_timeout(qca8k_mii_read32, val, !(val & mask), 0,
QCA8K_BUSY_WAIT_TIMEOUT * USEC_PER_MSEC, false,
priv->bus, 0x10 | r2, r1);
bus, 0x10 | r2, r1);
/* Check if qca8k_read has failed for a different reason
* before returnting -ETIMEDOUT
@ -651,19 +652,16 @@ qca8k_mdio_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask)
}
static int
qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
qca8k_mdio_write(struct mii_bus *salve_bus, int phy, int regnum, u16 data)
{
struct qca8k_priv *priv = salve_bus->priv;
u16 r1, r2, page;
u32 phy, val;
u32 val;
int ret;
if (regnum >= QCA8K_MDIO_MASTER_MAX_REG)
return -EINVAL;
/* callee is responsible for not passing bad ports,
* but we still would like to make spills impossible.
*/
phy = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
val = QCA8K_MDIO_MASTER_BUSY | QCA8K_MDIO_MASTER_EN |
QCA8K_MDIO_MASTER_WRITE | QCA8K_MDIO_MASTER_PHY_ADDR(phy) |
QCA8K_MDIO_MASTER_REG_ADDR(regnum) |
@ -679,33 +677,29 @@ qca8k_mdio_write(struct qca8k_priv *priv, int port, u32 regnum, u16 data)
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
ret = qca8k_mdio_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_BUSY);
exit:
mutex_unlock(&priv->bus->mdio_lock);
/* even if the busy_wait timeouts try to clear the MASTER_EN */
qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_EN);
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
mutex_unlock(&priv->bus->mdio_lock);
return ret;
}
static int
qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum)
qca8k_mdio_read(struct mii_bus *salve_bus, int phy, int regnum)
{
struct qca8k_priv *priv = salve_bus->priv;
u16 r1, r2, page;
u32 phy, val;
u32 val;
int ret;
if (regnum >= QCA8K_MDIO_MASTER_MAX_REG)
return -EINVAL;
/* callee is responsible for not passing bad ports,
* but we still would like to make spills impossible.
*/
phy = qca8k_port_to_phy(port) % PHY_MAX_ADDR;
val = QCA8K_MDIO_MASTER_BUSY | QCA8K_MDIO_MASTER_EN |
QCA8K_MDIO_MASTER_READ | QCA8K_MDIO_MASTER_PHY_ADDR(phy) |
QCA8K_MDIO_MASTER_REG_ADDR(regnum);
@ -720,24 +714,22 @@ qca8k_mdio_read(struct qca8k_priv *priv, int port, u32 regnum)
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
ret = qca8k_mdio_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_BUSY);
if (ret)
goto exit;
val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
val &= QCA8K_MDIO_MASTER_DATA_MASK;
exit:
/* even if the busy_wait timeouts try to clear the MASTER_EN */
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
mutex_unlock(&priv->bus->mdio_lock);
if (val >= 0)
val &= QCA8K_MDIO_MASTER_DATA_MASK;
/* even if the busy_wait timeouts try to clear the MASTER_EN */
qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_EN);
return val;
}
@ -746,7 +738,14 @@ qca8k_phy_write(struct dsa_switch *ds, int port, int regnum, u16 data)
{
struct qca8k_priv *priv = ds->priv;
return qca8k_mdio_write(priv, port, regnum, data);
/* 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;
return qca8k_mdio_write(priv->bus, port, regnum, data);
}
static int
@ -755,7 +754,14 @@ qca8k_phy_read(struct dsa_switch *ds, int port, int regnum)
struct qca8k_priv *priv = ds->priv;
int ret;
ret = qca8k_mdio_read(priv, port, regnum);
/* 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;
ret = qca8k_mdio_read(priv->bus, port, regnum);
if (ret < 0)
return 0xffff;
@ -763,11 +769,38 @@ qca8k_phy_read(struct dsa_switch *ds, int port, int regnum)
return ret;
}
static int
qca8k_mdio_register(struct qca8k_priv *priv, struct device_node *mdio)
{
struct dsa_switch *ds = priv->ds;
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_mdio_read;
bus->write = qca8k_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);
}
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;
struct device_node *ports, *port, *mdio;
phy_interface_t mode;
int err;
ports = of_get_child_by_name(priv->dev->of_node, "ports");
@ -788,7 +821,10 @@ qca8k_setup_mdio_bus(struct qca8k_priv *priv)
if (!dsa_is_user_port(priv->ds, reg))
continue;
if (of_property_read_bool(port, "phy-handle"))
of_get_phy_mode(port, &mode);
if (of_property_read_bool(port, "phy-handle") &&
mode != PHY_INTERFACE_MODE_INTERNAL)
external_mdio_mask |= BIT(reg);
else
internal_mdio_mask |= BIT(reg);
@ -825,8 +861,23 @@ qca8k_setup_mdio_bus(struct qca8k_priv *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;
}
@ -1212,7 +1263,8 @@ qca8k_phylink_validate(struct dsa_switch *ds, int port,
case 5:
/* Internal PHY */
if (state->interface != PHY_INTERFACE_MODE_NA &&
state->interface != PHY_INTERFACE_MODE_GMII)
state->interface != PHY_INTERFACE_MODE_GMII &&
state->interface != PHY_INTERFACE_MODE_INTERNAL)
goto unsupported;
break;
case 6: /* 2nd CPU port / external PHY */

1
drivers/net/dsa/qca8k.h
View File

@ -255,6 +255,7 @@ struct qca8k_priv {
u8 switch_revision;
u8 rgmii_tx_delay;
u8 rgmii_rx_delay;
bool legacy_phy_port_mapping;
struct regmap *regmap;
struct mii_bus *bus;
struct ar8xxx_port_status port_sts[QCA8K_NUM_PORTS];