[PATCH net-next v4 4/9] net: dsa: microchip: ksz9477: add Wake on LAN support
From: Oleksij Rempel
Date: Mon Oct 16 2023 - 10:13:35 EST
Add WoL support for KSZ9477 family of switches. This code was tested on
KSZ8563 chip.
KSZ9477 family of switches supports multiple PHY events:
- wake on Link Up
- wake on Energy Detect.
Since current UAPI can't differentiate between this PHY events, map all of them
to WAKE_PHY.
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
drivers/net/dsa/microchip/ksz9477.c | 108 +++++++++++++++++++++++++
drivers/net/dsa/microchip/ksz9477.h | 4 +
drivers/net/dsa/microchip/ksz_common.c | 24 ++++++
drivers/net/dsa/microchip/ksz_common.h | 4 +
4 files changed, 140 insertions(+)
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 3eacf5abb0f0..8b512b55bfe5 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -56,6 +56,111 @@ int ksz9477_change_mtu(struct ksz_device *dev, int port, int mtu)
REG_SW_MTU_MASK, frame_size);
}
+/**
+ * ksz9477_handle_wake_reason - Handle wake reason on a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ *
+ * This function reads the PME (Power Management Event) status register of a
+ * specified port to determine the wake reason. If there is no wake event, it
+ * returns early. Otherwise, it logs the wake reason which could be due to a
+ * "Magic Packet", "Link Up", or "Energy Detect" event. The PME status register
+ * is then cleared to acknowledge the handling of the wake event.
+ *
+ * Return: 0 on success, or an error code on failure.
+ */
+static int ksz9477_handle_wake_reason(struct ksz_device *dev, int port)
+{
+ u8 pme_status;
+ int ret;
+
+ ret = ksz_pread8(dev, port, REG_PORT_PME_STATUS, &pme_status);
+ if (ret)
+ return ret;
+
+ if (!pme_status)
+ return 0;
+
+ dev_dbg(dev->dev, "Wake event on port %d due to: %s %s\n", port,
+ pme_status & PME_WOL_LINKUP ? "\"Link Up\"" : "",
+ pme_status & PME_WOL_ENERGY ? "\"Enery detect\"" : "");
+
+ return ksz_pwrite8(dev, port, REG_PORT_PME_STATUS, pme_status);
+}
+
+/**
+ * ksz9477_get_wol - Get Wake-on-LAN settings for a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ * @wol: Pointer to ethtool Wake-on-LAN settings structure.
+ *
+ * This function checks the PME Pin Control Register to see if PME Pin Output
+ * Enable is set, indicating PME is enabled. If enabled, it sets the supported
+ * and active WoL flags.
+ */
+void ksz9477_get_wol(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol)
+{
+ u8 pme_ctrl, pme_conf;
+ int ret;
+
+ ret = ksz_read8(dev, REG_SW_PME_CTRL, &pme_conf);
+ if (ret)
+ return;
+
+ if (!(pme_conf & PME_ENABLE))
+ return;
+
+ wol->supported = WAKE_PHY;
+
+ ret = ksz_pread8(dev, port, REG_PORT_PME_CTRL, &pme_ctrl);
+ if (ret)
+ return;
+
+ if (pme_ctrl & (PME_WOL_LINKUP | PME_WOL_ENERGY))
+ wol->wolopts |= WAKE_PHY;
+}
+
+/**
+ * ksz9477_set_wol - Set Wake-on-LAN settings for a specified port.
+ * @dev: The device structure.
+ * @port: The port number.
+ * @wol: Pointer to ethtool Wake-on-LAN settings structure.
+ *
+ * This function configures Wake-on-LAN (WoL) settings for a specified port.
+ * It validates the provided WoL options, checks if PME is enabled via the
+ * switch's PME Pin Control Register, clears any previous wake reasons,
+ * and sets the Magic Packet flag in the port's PME control register if
+ * specified.
+ *
+ * Return: 0 on success, or other error codes on failure.
+ */
+int ksz9477_set_wol(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol)
+{
+ u8 pme_conf, pme_ctrl = 0;
+ int ret;
+
+ if (wol->wolopts & ~WAKE_PHY)
+ return -EINVAL;
+
+ ret = ksz_read8(dev, REG_SW_PME_CTRL, &pme_conf);
+ if (ret)
+ return ret;
+
+ if (!(pme_conf & PME_ENABLE))
+ return -EOPNOTSUPP;
+
+ ret = ksz9477_handle_wake_reason(dev, port);
+ if (ret)
+ return ret;
+
+ if (wol->wolopts & WAKE_PHY)
+ pme_ctrl |= PME_WOL_LINKUP | PME_WOL_ENERGY;
+
+ return ksz_pwrite8(dev, port, REG_PORT_PME_CTRL, pme_ctrl);
+}
+
static int ksz9477_wait_vlan_ctrl_ready(struct ksz_device *dev)
{
unsigned int val;
@@ -1006,6 +1111,9 @@ void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
ksz_pread16(dev, port, REG_PORT_PHY_INT_ENABLE, &data16);
ksz9477_port_acl_init(dev, port);
+
+ /* clear pending wake flags */
+ ksz9477_handle_wake_reason(dev, port);
}
void ksz9477_config_cpu_port(struct dsa_switch *ds)
diff --git a/drivers/net/dsa/microchip/ksz9477.h b/drivers/net/dsa/microchip/ksz9477.h
index f90e2e8ebe80..fa8d0318b437 100644
--- a/drivers/net/dsa/microchip/ksz9477.h
+++ b/drivers/net/dsa/microchip/ksz9477.h
@@ -58,6 +58,10 @@ void ksz9477_switch_exit(struct ksz_device *dev);
void ksz9477_port_queue_split(struct ksz_device *dev, int port);
void ksz9477_hsr_join(struct dsa_switch *ds, int port, struct net_device *hsr);
void ksz9477_hsr_leave(struct dsa_switch *ds, int port, struct net_device *hsr);
+void ksz9477_get_wol(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol);
+int ksz9477_set_wol(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol);
int ksz9477_port_acl_init(struct ksz_device *dev, int port);
void ksz9477_port_acl_free(struct ksz_device *dev, int port);
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 11adae8a2037..3f7c86e545a7 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -319,6 +319,8 @@ static const struct ksz_dev_ops ksz9477_dev_ops = {
.mdb_del = ksz9477_mdb_del,
.change_mtu = ksz9477_change_mtu,
.phylink_mac_link_up = ksz9477_phylink_mac_link_up,
+ .get_wol = ksz9477_get_wol,
+ .set_wol = ksz9477_set_wol,
.config_cpu_port = ksz9477_config_cpu_port,
.tc_cbs_set_cinc = ksz9477_tc_cbs_set_cinc,
.enable_stp_addr = ksz9477_enable_stp_addr,
@@ -3543,6 +3545,26 @@ static int ksz_setup_tc(struct dsa_switch *ds, int port,
}
}
+static void ksz_get_wol(struct dsa_switch *ds, int port,
+ struct ethtool_wolinfo *wol)
+{
+ struct ksz_device *dev = ds->priv;
+
+ if (dev->dev_ops->get_wol)
+ dev->dev_ops->get_wol(dev, port, wol);
+}
+
+static int ksz_set_wol(struct dsa_switch *ds, int port,
+ struct ethtool_wolinfo *wol)
+{
+ struct ksz_device *dev = ds->priv;
+
+ if (dev->dev_ops->set_wol)
+ return dev->dev_ops->set_wol(dev, port, wol);
+
+ return -EOPNOTSUPP;
+}
+
static int ksz_port_set_mac_address(struct dsa_switch *ds, int port,
const unsigned char *addr)
{
@@ -3727,6 +3749,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
.get_pause_stats = ksz_get_pause_stats,
.port_change_mtu = ksz_change_mtu,
.port_max_mtu = ksz_max_mtu,
+ .get_wol = ksz_get_wol,
+ .set_wol = ksz_set_wol,
.get_ts_info = ksz_get_ts_info,
.port_hwtstamp_get = ksz_hwtstamp_get,
.port_hwtstamp_set = ksz_hwtstamp_set,
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index f7c471bc040f..a7394175fcf6 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -374,6 +374,10 @@ struct ksz_dev_ops {
int duplex, bool tx_pause, bool rx_pause);
void (*setup_rgmii_delay)(struct ksz_device *dev, int port);
int (*tc_cbs_set_cinc)(struct ksz_device *dev, int port, u32 val);
+ void (*get_wol)(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol);
+ int (*set_wol)(struct ksz_device *dev, int port,
+ struct ethtool_wolinfo *wol);
void (*config_cpu_port)(struct dsa_switch *ds);
int (*enable_stp_addr)(struct ksz_device *dev);
int (*reset)(struct ksz_device *dev);
--
2.39.2