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path: root/drivers/net/ethernet/engleder/tsnep_ptp.c
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Diffstat (limited to 'drivers/net/ethernet/engleder/tsnep_ptp.c')
-rw-r--r--drivers/net/ethernet/engleder/tsnep_ptp.c246
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 0000000000..54fbf01268
--- /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");
+ }
+}
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