Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/drivers/net/ethernet/engleder/tsnep_ptp.c b/drivers/net/ethernet/engleder/tsnep_ptp.c
new file mode 100644
index 000000000..54fbf0126
--- /dev/null
+++ b/drivers/net/ethernet/engleder/tsnep_ptp.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
+
+#include "tsnep.h"
+
+void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time)
+{
+	u32 high_before;
+	u32 low;
+	u32 high;
+
+	/* read high dword twice to detect overrun */
+	high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	do {
+		low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+		high_before = high;
+		high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	} while (high != high_before);
+	*time = (((u64)high) << 32) | ((u64)low);
+}
+
+int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct tsnep_adapter *adapter = netdev_priv(netdev);
+	struct hwtstamp_config config;
+
+	if (!ifr)
+		return -EINVAL;
+
+	if (cmd == SIOCSHWTSTAMP) {
+		if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+			return -EFAULT;
+
+		switch (config.tx_type) {
+		case HWTSTAMP_TX_OFF:
+		case HWTSTAMP_TX_ON:
+			break;
+		default:
+			return -ERANGE;
+		}
+
+		switch (config.rx_filter) {
+		case HWTSTAMP_FILTER_NONE:
+			break;
+		case HWTSTAMP_FILTER_ALL:
+		case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+		case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+		case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+		case HWTSTAMP_FILTER_PTP_V2_EVENT:
+		case HWTSTAMP_FILTER_PTP_V2_SYNC:
+		case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+		case HWTSTAMP_FILTER_NTP_ALL:
+			config.rx_filter = HWTSTAMP_FILTER_ALL;
+			break;
+		default:
+			return -ERANGE;
+		}
+
+		memcpy(&adapter->hwtstamp_config, &config,
+		       sizeof(adapter->hwtstamp_config));
+	}
+
+	if (copy_to_user(ifr->ifr_data, &adapter->hwtstamp_config,
+			 sizeof(adapter->hwtstamp_config)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int tsnep_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	bool negative = false;
+	u64 rate_offset;
+
+	if (scaled_ppm < 0) {
+		scaled_ppm = -scaled_ppm;
+		negative = true;
+	}
+
+	/* convert from 16 bit to 32 bit binary fractional, divide by 1000000 to
+	 * eliminate ppm, multiply with 8 to compensate 8ns clock cycle time,
+	 * simplify calculation because 15625 * 8 = 1000000 / 8
+	 */
+	rate_offset = scaled_ppm;
+	rate_offset <<= 16 - 3;
+	rate_offset = div_u64(rate_offset, 15625);
+
+	rate_offset &= ECM_CLOCK_RATE_OFFSET_MASK;
+	if (negative)
+		rate_offset |= ECM_CLOCK_RATE_OFFSET_SIGN;
+	iowrite32(rate_offset & 0xFFFFFFFF, adapter->addr + ECM_CLOCK_RATE);
+
+	return 0;
+}
+
+static int tsnep_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u64 system_time;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->ptp_lock, flags);
+
+	tsnep_get_system_time(adapter, &system_time);
+
+	system_time += delta;
+
+	/* high dword is buffered in hardware and synchronously written to
+	 * system time when low dword is written
+	 */
+	iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	iowrite32(system_time & 0xFFFFFFFF,
+		  adapter->addr + ECM_SYSTEM_TIME_LOW);
+
+	spin_unlock_irqrestore(&adapter->ptp_lock, flags);
+
+	return 0;
+}
+
+static int tsnep_ptp_gettimex64(struct ptp_clock_info *ptp,
+				struct timespec64 *ts,
+				struct ptp_system_timestamp *sts)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u32 high_before;
+	u32 low;
+	u32 high;
+	u64 system_time;
+
+	/* read high dword twice to detect overrun */
+	high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	do {
+		ptp_read_system_prets(sts);
+		low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
+		ptp_read_system_postts(sts);
+		high_before = high;
+		high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	} while (high != high_before);
+	system_time = (((u64)high) << 32) | ((u64)low);
+
+	*ts = ns_to_timespec64(system_time);
+
+	return 0;
+}
+
+static int tsnep_ptp_settime64(struct ptp_clock_info *ptp,
+			       const struct timespec64 *ts)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u64 system_time = timespec64_to_ns(ts);
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->ptp_lock, flags);
+
+	/* high dword is buffered in hardware and synchronously written to
+	 * system time when low dword is written
+	 */
+	iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
+	iowrite32(system_time & 0xFFFFFFFF,
+		  adapter->addr + ECM_SYSTEM_TIME_LOW);
+
+	spin_unlock_irqrestore(&adapter->ptp_lock, flags);
+
+	return 0;
+}
+
+static int tsnep_ptp_getcyclesx64(struct ptp_clock_info *ptp,
+				  struct timespec64 *ts,
+				  struct ptp_system_timestamp *sts)
+{
+	struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
+						     ptp_clock_info);
+	u32 high_before;
+	u32 low;
+	u32 high;
+	u64 counter;
+
+	/* read high dword twice to detect overrun */
+	high = ioread32(adapter->addr + ECM_COUNTER_HIGH);
+	do {
+		ptp_read_system_prets(sts);
+		low = ioread32(adapter->addr + ECM_COUNTER_LOW);
+		ptp_read_system_postts(sts);
+		high_before = high;
+		high = ioread32(adapter->addr + ECM_COUNTER_HIGH);
+	} while (high != high_before);
+	counter = (((u64)high) << 32) | ((u64)low);
+
+	*ts = ns_to_timespec64(counter);
+
+	return 0;
+}
+
+int tsnep_ptp_init(struct tsnep_adapter *adapter)
+{
+	int retval = 0;
+
+	adapter->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
+	adapter->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
+
+	snprintf(adapter->ptp_clock_info.name, 16, "%s", TSNEP);
+	adapter->ptp_clock_info.owner = THIS_MODULE;
+	/* at most 2^-1ns adjustment every clock cycle for 8ns clock cycle time,
+	 * stay slightly below because only bits below 2^-1ns are supported
+	 */
+	adapter->ptp_clock_info.max_adj = (500000000 / 8 - 1);
+	adapter->ptp_clock_info.adjfine = tsnep_ptp_adjfine;
+	adapter->ptp_clock_info.adjtime = tsnep_ptp_adjtime;
+	adapter->ptp_clock_info.gettimex64 = tsnep_ptp_gettimex64;
+	adapter->ptp_clock_info.settime64 = tsnep_ptp_settime64;
+	adapter->ptp_clock_info.getcyclesx64 = tsnep_ptp_getcyclesx64;
+
+	spin_lock_init(&adapter->ptp_lock);
+
+	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
+						&adapter->pdev->dev);
+	if (IS_ERR(adapter->ptp_clock)) {
+		netdev_err(adapter->netdev, "ptp_clock_register failed\n");
+
+		retval = PTR_ERR(adapter->ptp_clock);
+		adapter->ptp_clock = NULL;
+	} else if (adapter->ptp_clock) {
+		netdev_info(adapter->netdev, "PHC added\n");
+	}
+
+	return retval;
+}
+
+void tsnep_ptp_cleanup(struct tsnep_adapter *adapter)
+{
+	if (adapter->ptp_clock) {
+		ptp_clock_unregister(adapter->ptp_clock);
+		netdev_info(adapter->netdev, "PHC removed\n");
+	}
+}