[PATCH v9 net-next 07/11] net: dsa: microchip: add support for phylink management

Prasanna Vengateshan
2022-03-18T08:58:33Z

phylink_get_caps() is implemented and reused KSZ commmon API for
phylink_mac_link_down() operation

lan937x_phylink_mac_config configures the interface using
lan937x_mac_config and lan937x_phylink_mac_link_up configures
the speed/duplex/flow control.

Currently SGMII & in-band neg are not supported & it will be
added later.

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
---
drivers/net/dsa/microchip/lan937x_dev.c | 158 +++++++++++++++++++++++
drivers/net/dsa/microchip/lan937x_dev.h | 6 +
drivers/net/dsa/microchip/lan937x_main.c | 66 ++++++++++
3 files changed, 230 insertions(+)

diff --git a/drivers/net/dsa/microchip/lan937x_dev.c b/drivers/net/dsa/microchip/lan937x_dev.c
index e0bd1eb3d3ab..ec6ca6ff7747 100644
--- a/drivers/net/dsa/microchip/lan937x_dev.c
+++ b/drivers/net/dsa/microchip/lan937x_dev.c
@@ -401,6 +401,164 @@ int lan937x_internal_phy_read(struct ksz_device *dev, int addr, int reg,
return ksz_read16(dev, REG_VPHY_IND_DATA__2, val);
}

+static void lan937x_config_gbit(struct ksz_device *dev, bool gbit, u8 *data)
+{
+ if (gbit)
+ *data &= ~PORT_MII_NOT_1GBIT;
+ else
+ *data |= PORT_MII_NOT_1GBIT;
+}
+
+static void lan937x_update_rgmii_tx_rx_delay(struct ksz_device *dev, int port,
+ bool is_tx)
+{
+ u16 data16;
+ int reg;
+ u8 val;
+
+ /* Apply different codes based on the ports as per characterization
+ * results
+ */
+ if (is_tx) {
+ reg = REG_PORT_XMII_CTRL_5;
+ val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_TX_DELAY_2NS :
+ RGMII_2_TX_DELAY_2NS;
+ } else {
+ reg = REG_PORT_XMII_CTRL_4;
+ val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_RX_DELAY_2NS :
+ RGMII_2_RX_DELAY_2NS;
+ }
+
+ lan937x_pread16(dev, port, reg, &data16);
+
+ /* clear tune Adjust */
+ data16 &= ~PORT_TUNE_ADJ;
+ data16 |= (val << 7);
+ lan937x_pwrite16(dev, port, reg, data16);
+
+ data16 |= PORT_DLL_RESET;
+ /* write DLL reset to take effect */
+ lan937x_pwrite16(dev, port, reg, data16);
+}
+
+static void lan937x_apply_rgmii_delay(struct ksz_device *dev, int port,
+ phy_interface_t interface, u8 val)
+{
+ struct ksz_port *p = &dev->ports[port];
+
+ /* Clear Ingress & Egress internal delay enabled bits */
+ val &= ~(PORT_RGMII_ID_EG_ENABLE | PORT_RGMII_ID_IG_ENABLE);
+
+ /* if the delay is 0, do not enable DLL */
+ if (p->rgmii_tx_val) {
+ lan937x_update_rgmii_tx_rx_delay(dev, port, true);
+ dev_info(dev->dev, "Applied rgmii tx delay for the port %d\n",
+ port);
+ val |= PORT_RGMII_ID_EG_ENABLE;
+ }
+
+ /* if the delay is 0, do not enable DLL */
+ if (p->rgmii_rx_val) {
+ lan937x_update_rgmii_tx_rx_delay(dev, port, false);
+ dev_info(dev->dev, "Applied rgmii rx delay for the port %d\n",
+ port);
+ val |= PORT_RGMII_ID_IG_ENABLE;
+ }
+
+ /* Enable RGMII internal delays */
+ lan937x_pwrite8(dev, port, REG_PORT_XMII_CTRL_1, val);
+}
+
+void lan937x_mac_config(struct ksz_device *dev, int port,
+ phy_interface_t interface)
+{
+ u8 data8;
+
+ lan937x_pread8(dev, port, REG_PORT_XMII_CTRL_1, &data8);
+
+ /* clear MII selection & set it based on interface later */
+ data8 &= ~PORT_MII_SEL_M;
+
+ /* configure MAC based on interface */
+ switch (interface) {
+ case PHY_INTERFACE_MODE_MII:
+ lan937x_config_gbit(dev, false, &data8);
+ data8 |= PORT_MII_SEL;
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ lan937x_config_gbit(dev, false, &data8);
+ data8 |= PORT_RMII_SEL;
+ break;
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ lan937x_config_gbit(dev, true, &data8);
+ data8 |= PORT_RGMII_SEL;
+
+ /* Apply rgmii internal delay for the mac */
+ lan937x_apply_rgmii_delay(dev, port, interface, data8);
+
+ /* rgmii delay configuration is already applied above,
+ * hence return from here as no changes required
+ */
+ return;
+ default:
+ dev_err(dev->dev, "Unsupported interface '%s' for port %d\n",
+ phy_modes(interface), port);
+ return;
+ }
+
+ /* Write the updated value */
+ lan937x_pwrite8(dev, port, REG_PORT_XMII_CTRL_1, data8);
+}
+
+void lan937x_config_interface(struct ksz_device *dev, int port,
+ int speed, int duplex,
+ bool tx_pause, bool rx_pause)
+{
+ u8 xmii_ctrl0, xmii_ctrl1;
+
+ lan937x_pread8(dev, port, REG_PORT_XMII_CTRL_0, &xmii_ctrl0);
+ lan937x_pread8(dev, port, REG_PORT_XMII_CTRL_1, &xmii_ctrl1);
+
+ switch (speed) {
+ case SPEED_1000:
+ lan937x_config_gbit(dev, true, &xmii_ctrl1);
+ break;
+ case SPEED_100:
+ lan937x_config_gbit(dev, false, &xmii_ctrl1);
+ xmii_ctrl0 |= PORT_MAC_SPEED_100;
+ break;
+ case SPEED_10:
+ lan937x_config_gbit(dev, false, &xmii_ctrl1);
+ xmii_ctrl0 &= ~PORT_MAC_SPEED_100;
+ break;
+ default:
+ dev_err(dev->dev, "Unsupported speed on port %d: %d\n",
+ port, speed);
+ return;
+ }
+
+ if (duplex)
+ xmii_ctrl0 |= PORT_FULL_DUPLEX;
+ else
+ xmii_ctrl0 &= ~PORT_FULL_DUPLEX;
+
+ if (tx_pause)
+ xmii_ctrl0 |= PORT_TX_FLOW_CTRL;
+ else
+ xmii_ctrl1 &= ~PORT_TX_FLOW_CTRL;
+
+ if (rx_pause)
+ xmii_ctrl0 |= PORT_RX_FLOW_CTRL;
+ else
+ xmii_ctrl0 &= ~PORT_RX_FLOW_CTRL;
+
+ lan937x_pwrite8(dev, port, REG_PORT_XMII_CTRL_0, xmii_ctrl0);
+ lan937x_pwrite8(dev, port, REG_PORT_XMII_CTRL_1, xmii_ctrl1);
+}
+
void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port)
{
struct dsa_switch *ds = dev->ds;
diff --git a/drivers/net/dsa/microchip/lan937x_dev.h b/drivers/net/dsa/microchip/lan937x_dev.h
index 4b412f79854a..32167fe6f748 100644
--- a/drivers/net/dsa/microchip/lan937x_dev.h
+++ b/drivers/net/dsa/microchip/lan937x_dev.h
@@ -34,8 +34,14 @@ void lan937x_cfg_port_member(struct ksz_device *dev, int port,
u8 member);
void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port);
int lan937x_enable_spi_indirect_access(struct ksz_device *dev);
+void lan937x_config_interface(struct ksz_device *dev, int port,
+ int speed, int duplex,
+ bool tx_pause, bool rx_pause);
+void lan937x_mac_config(struct ksz_device *dev, int port,
+ phy_interface_t interface);
void lan937x_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
u64 *dropped, u64 *cnt);
+
struct mib_names {
int index;
char string[ETH_GSTRING_LEN];
diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 87ef6aedf631..24971d9d087c 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -272,6 +272,68 @@ static int lan937x_get_max_mtu(struct dsa_switch *ds, int port)
return (FR_MAX_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN);
}

+static void lan937x_phylink_mac_config(struct dsa_switch *ds, int port,
+ unsigned int mode,
+ const struct phylink_link_state *state)
+{
+ struct ksz_device *dev = ds->priv;
+
+ /* Internal PHYs */
+ if (lan937x_is_internal_phy_port(dev, port))
+ return;
+
+ if (phylink_autoneg_inband(mode)) {
+ dev_err(ds->dev, "In-band AN not supported!\n");
+ return;
+ }
+
+ lan937x_mac_config(dev, port, state->interface);
+}
+
+static void lan937x_phylink_mac_link_up(struct dsa_switch *ds, int port,
+ unsigned int mode,
+ phy_interface_t interface,
+ struct phy_device *phydev,
+ int speed, int duplex,
+ bool tx_pause, bool rx_pause)
+{
+ struct ksz_device *dev = ds->priv;
+
+ /* Internal PHYs */
+ if (lan937x_is_internal_phy_port(dev, port))
+ return;
+
+ lan937x_config_interface(dev, port, speed, duplex,
+ tx_pause, rx_pause);
+}
+
+static void lan937x_phylink_get_caps(struct dsa_switch *ds, int port,
+ struct phylink_config *config)
+{
+ struct ksz_device *dev = ds->priv;
+
+ /* non legacy driver */
+ config->legacy_pre_march2020 = false;
+
+ config->mac_capabilities = MAC_100FD;
+
+ /* internal T1 PHY */
+ if (lan937x_is_internal_base_t1_phy_port(dev, port)) {
+ __set_bit(PHY_INTERFACE_MODE_INTERNAL,
+ config->supported_interfaces);
+ } else if (lan937x_is_rgmii_port(dev, port)) {
+ /* MII/RMII/RGMII ports */
+ config->mac_capabilities |= MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
+ MAC_100HD | MAC_10 | MAC_1000FD;
+ phy_interface_set_rgmii(config->supported_interfaces);
+
+ __set_bit(PHY_INTERFACE_MODE_MII,
+ config->supported_interfaces);
+ __set_bit(PHY_INTERFACE_MODE_RMII,
+ config->supported_interfaces);
+ }
+}
+
const struct dsa_switch_ops lan937x_switch_ops = {
.get_tag_protocol = lan937x_get_tag_protocol,
.setup = lan937x_setup,
@@ -284,6 +346,10 @@ const struct dsa_switch_ops lan937x_switch_ops = {
.port_fast_age = ksz_port_fast_age,
.port_max_mtu = lan937x_get_max_mtu,
.port_change_mtu = lan937x_change_mtu,
+ .phylink_get_caps = lan937x_phylink_get_caps,
+ .phylink_mac_link_down = ksz_mac_link_down,
+ .phylink_mac_config = lan937x_phylink_mac_config,
+ .phylink_mac_link_up = lan937x_phylink_mac_link_up,
};

int lan937x_switch_register(struct ksz_device *dev)
--
2.30.2