net: ti: icssg-prueth: add packet timestamping and ptp support

Add packet timestamping TS and PTP PHC clock support.

For AM65x and AM64x:
 - IEP1 is not used
 - IEP0 is configured in shadow mode with 1ms cycle and shared between
Linux and FW. It provides time and TS in number cycles, so special
conversation in ns is required.
 - IEP0 shared between PRUeth ports.
 - IEP0 supports PPS, periodic output.
 - IEP0 settime() and enabling PPS required FW interraction.
 - RX TS provided with each packet in CPPI5 descriptor.
 - TX TS returned through separate ICSSG hw queues for each port. TX TS
readiness is signaled by INTC IRQ. Only one packet at time can be requested
for TX TS.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Co-developed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Roger Quadros

drivers/net/ethernet/ti/Kconfig

@@ -186,6 +186,7 @@ config CPMAC
 config TI_ICSSG_PRUETH
 	tristate "TI Gigabit PRU Ethernet driver"
 	select PHYLIB
+	select TI_ICSS_IEP
 	depends on PRU_REMOTEPROC
 	depends on ARCH_K3 && OF && TI_K3_UDMA_GLUE_LAYER
 	help

drivers/net/ethernet/ti/icssg/icss_iep.h

@@ -13,6 +13,7 @@
 #include <linux/regmap.h>
 
 struct icss_iep;
+extern const struct icss_iep_clockops prueth_iep_clockops;
 
 /* Firmware specific clock operations */
 struct icss_iep_clockops {

drivers/net/ethernet/ti/icssg/icssg_ethtool.c

@@ -109,6 +109,26 @@ static void emac_get_ethtool_stats(struct net_device *ndev,
 			*(data++) = emac->stats[i];
 }
 
+static int emac_get_ts_info(struct net_device *ndev,
+			    struct ethtool_ts_info *info)
+{
+	struct prueth_emac *emac = netdev_priv(ndev);
+
+	info->so_timestamping =
+		SOF_TIMESTAMPING_TX_HARDWARE |
+		SOF_TIMESTAMPING_TX_SOFTWARE |
+		SOF_TIMESTAMPING_RX_HARDWARE |
+		SOF_TIMESTAMPING_RX_SOFTWARE |
+		SOF_TIMESTAMPING_SOFTWARE |
+		SOF_TIMESTAMPING_RAW_HARDWARE;
+
+	info->phc_index = icss_iep_get_ptp_clock_idx(emac->iep);
+	info->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ON);
+	info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | BIT(HWTSTAMP_FILTER_ALL);
+
+	return 0;
+}
+
 static int emac_set_channels(struct net_device *ndev,
 			     struct ethtool_channels *ch)
 {
@@ -176,6 +196,7 @@ const struct ethtool_ops icssg_ethtool_ops = {
 	.get_sset_count = emac_get_sset_count,
 	.get_ethtool_stats = emac_get_ethtool_stats,
 	.get_strings = emac_get_strings,
+	.get_ts_info = emac_get_ts_info,
 	.get_channels = emac_get_channels,
 	.set_channels = emac_set_channels,
 	.get_link_ksettings = emac_get_link_ksettings,