[Patch net-next v1 02/12] net: dsa: microchip: ptp: Initial hardware time stamping support

[Arun Ramadoss <arun.ramadoss@microchip.com>]

From: Christian Eggers <ceggers@arri.de>

This patch adds the routine for get_ts_info, hwstamp_get, set. This enables
the PTP support towards userspace applications such as linuxptp.
Tx timestamping can be enabled per port and Rx timestamping enabled
globally.

Signed-off-by: Christian Eggers <ceggers@arri.de>
Co-developed-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>

---
RFC v2 -> Patch v1
- moved tagger set and get function to separate patch
- Removed unnecessary comments
---
 drivers/net/dsa/microchip/ksz_common.c |  2 +
 drivers/net/dsa/microchip/ksz_common.h |  4 ++
 drivers/net/dsa/microchip/ksz_ptp.c    | 77 +++++++++++++++++++++++++-
 drivers/net/dsa/microchip/ksz_ptp.h    | 14 +++++
 4 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 2d09cd141db6..7b85b258270c 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2873,6 +2873,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
 	.port_change_mtu	= ksz_change_mtu,
 	.port_max_mtu		= ksz_max_mtu,
 	.get_ts_info            = ksz_get_ts_info,
+	.port_hwtstamp_get      = ksz_hwtstamp_get,
+	.port_hwtstamp_set      = ksz_hwtstamp_set,
 };
 
 struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 5a6bfd42c6f9..cd20f39a565f 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -103,6 +103,10 @@ struct ksz_port {
 	struct ksz_device *ksz_dev;
 	struct ksz_irq pirq;
 	u8 num;
+#if IS_ENABLED(CONFIG_NET_DSA_MICROCHIP_KSZ_PTP)
+	u8 hwts_tx_en;
+	bool hwts_rx_en;
+#endif
 };
 
 struct ksz_device {
diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c
index c737635ca266..a41418c6adf6 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.c
+++ b/drivers/net/dsa/microchip/ksz_ptp.c
@@ -36,15 +36,88 @@ int ksz_get_ts_info(struct dsa_switch *ds, int port, struct ethtool_ts_info *ts)
 			      SOF_TIMESTAMPING_RX_HARDWARE |
 			      SOF_TIMESTAMPING_RAW_HARDWARE;
 
-	ts->tx_types = BIT(HWTSTAMP_TX_OFF);
+	ts->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ONESTEP_P2P);
 
-	ts->rx_filters = BIT(HWTSTAMP_FILTER_NONE);
+	ts->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | BIT(HWTSTAMP_FILTER_ALL);
 
 	ts->phc_index = ptp_clock_index(ptp_data->clock);
 
 	return 0;
 }
 
+int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr)
+{
+	struct ksz_device *dev = ds->priv;
+	struct hwtstamp_config config;
+
+	config.flags = 0;
+
+	config.tx_type = dev->ports[port].hwts_tx_en;
+
+	if (dev->ports[port].hwts_rx_en)
+		config.rx_filter = HWTSTAMP_FILTER_ALL;
+	else
+		config.rx_filter = HWTSTAMP_FILTER_NONE;
+
+	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+		-EFAULT : 0;
+}
+
+static int ksz_set_hwtstamp_config(struct ksz_device *dev, int port,
+				   struct hwtstamp_config *config)
+{
+	struct ksz_port *prt = &dev->ports[port];
+
+	if (config->flags)
+		return -EINVAL;
+
+	switch (config->tx_type) {
+	case HWTSTAMP_TX_OFF:
+	case HWTSTAMP_TX_ONESTEP_P2P:
+		prt->hwts_tx_en = config->tx_type;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (config->rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		prt->hwts_rx_en = false;
+		break;
+	default:
+		prt->hwts_rx_en = true;
+		break;
+	}
+
+	return 0;
+}
+
+int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr)
+{
+	struct ksz_device *dev = ds->priv;
+	struct ksz_ptp_data *ptp_data;
+	struct hwtstamp_config config;
+	int ret;
+
+	ptp_data = &dev->ptp_data;
+
+	mutex_lock(&ptp_data->lock);
+
+	ret = copy_from_user(&config, ifr->ifr_data, sizeof(config));
+	if (ret)
+		goto error_return;
+
+	ret = ksz_set_hwtstamp_config(dev, port, &config);
+	if (ret)
+		goto error_return;
+
+	ret = copy_to_user(ifr->ifr_data, &config, sizeof(config));
+
+error_return:
+	mutex_unlock(&ptp_data->lock);
+	return ret;
+}
+
 static int _ksz_ptp_gettime(struct ksz_device *dev, struct timespec64 *ts)
 {
 	u32 nanoseconds;
diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h
index ea9fa46caa01..17f455c3b2c5 100644
--- a/drivers/net/dsa/microchip/ksz_ptp.h
+++ b/drivers/net/dsa/microchip/ksz_ptp.h
@@ -23,6 +23,8 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds);
 
 int ksz_get_ts_info(struct dsa_switch *ds, int port,
 		    struct ethtool_ts_info *ts);
+int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr);
+int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr);
 
 #else
 
@@ -40,6 +42,18 @@ static inline void ksz_ptp_clock_unregister(struct dsa_switch *ds) { }
 
 #define ksz_get_ts_info NULL
 
+static inline int ksz_hwtstamp_get(struct dsa_switch *ds, int port,
+				   struct ifreq *ifr)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int ksz_hwtstamp_set(struct dsa_switch *ds, int port,
+				   struct ifreq *ifr)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif	/* End of CONFIG_NET_DSA_MICROCHIP_KSZ_PTP */
 
 #endif
-- 
2.36.1