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Date: Wed, 11 May 2022 11:26:54 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: netdev@...r.kernel.org
Cc: Jiawen Wu <jiawenwu@...stnetic.com>
Subject: [PATCH net-next 09/14] net: txgbe: Support PTP
Add support to enable PTP clock.
Signed-off-by: Jiawen Wu <jiawenwu@...stnetic.com>
---
drivers/net/ethernet/wangxun/txgbe/Makefile | 2 +-
drivers/net/ethernet/wangxun/txgbe/txgbe.h | 34 +
.../net/ethernet/wangxun/txgbe/txgbe_main.c | 95 +-
.../net/ethernet/wangxun/txgbe/txgbe_ptp.c | 840 ++++++++++++++++++
4 files changed, 967 insertions(+), 4 deletions(-)
create mode 100644 drivers/net/ethernet/wangxun/txgbe/txgbe_ptp.c
diff --git a/drivers/net/ethernet/wangxun/txgbe/Makefile b/drivers/net/ethernet/wangxun/txgbe/Makefile
index aceb0d2e56ee..f233bc45575c 100644
--- a/drivers/net/ethernet/wangxun/txgbe/Makefile
+++ b/drivers/net/ethernet/wangxun/txgbe/Makefile
@@ -8,4 +8,4 @@ obj-$(CONFIG_TXGBE) += txgbe.o
txgbe-objs := txgbe_main.o \
txgbe_hw.o txgbe_phy.o \
- txgbe_lib.o
+ txgbe_lib.o txgbe_ptp.o
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe.h b/drivers/net/ethernet/wangxun/txgbe/txgbe.h
index 7a6683b33930..3b429cca494e 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe.h
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe.h
@@ -12,6 +12,8 @@
#include <linux/etherdevice.h>
#include <linux/timecounter.h>
#include <linux/clocksource.h>
+#include <linux/net_tstamp.h>
+#include <linux/ptp_clock_kernel.h>
#include <linux/aer.h>
#include "txgbe_type.h"
@@ -110,6 +112,7 @@ enum txgbe_tx_flags {
*/
struct txgbe_tx_buffer {
union txgbe_tx_desc *next_to_watch;
+ unsigned long time_stamp;
struct sk_buff *skb;
unsigned int bytecount;
unsigned short gso_segs;
@@ -200,6 +203,7 @@ struct txgbe_ring {
u8 reg_idx;
u16 next_to_use;
u16 next_to_clean;
+ unsigned long last_rx_timestamp;
u16 rx_buf_len;
union {
u16 next_to_alloc;
@@ -363,6 +367,8 @@ struct txgbe_mac_addr {
#define TXGBE_FLAG_VXLAN_OFFLOAD_ENABLE ((u32)(1 << 5))
#define TXGBE_FLAG_FDIR_HASH_CAPABLE ((u32)(1 << 6))
#define TXGBE_FLAG_FDIR_PERFECT_CAPABLE ((u32)(1 << 7))
+#define TXGBE_FLAG_RX_HWTSTAMP_ENABLED ((u32)(1 << 8))
+#define TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER ((u32)(1 << 9))
/**
* txgbe_adapter.flag2
@@ -477,6 +483,22 @@ struct txgbe_adapter {
bool netdev_registered;
u32 interrupt_event;
+ struct ptp_clock *ptp_clock;
+ struct ptp_clock_info ptp_caps;
+ struct work_struct ptp_tx_work;
+ struct sk_buff *ptp_tx_skb;
+ struct hwtstamp_config tstamp_config;
+ unsigned long ptp_tx_start;
+ unsigned long last_overflow_check;
+ unsigned long last_rx_ptp_check;
+ spinlock_t tmreg_lock;
+ struct cyclecounter hw_cc;
+ struct timecounter hw_tc;
+ u32 base_incval;
+ u32 tx_hwtstamp_timeouts;
+ u32 tx_hwtstamp_skipped;
+ u32 rx_hwtstamp_cleared;
+
struct txgbe_mac_addr *mac_table;
__le16 vxlan_port;
@@ -572,6 +594,18 @@ static inline struct netdev_queue *txring_txq(const struct txgbe_ring *ring)
return netdev_get_tx_queue(ring->netdev, ring->queue_index);
}
+void txgbe_ptp_init(struct txgbe_adapter *adapter);
+void txgbe_ptp_stop(struct txgbe_adapter *adapter);
+void txgbe_ptp_suspend(struct txgbe_adapter *adapter);
+void txgbe_ptp_overflow_check(struct txgbe_adapter *adapter);
+void txgbe_ptp_rx_hang(struct txgbe_adapter *adapter);
+void txgbe_ptp_rx_hwtstamp(struct txgbe_adapter *adapter, struct sk_buff *skb);
+int txgbe_ptp_set_ts_config(struct txgbe_adapter *adapter, struct ifreq *ifr);
+int txgbe_ptp_get_ts_config(struct txgbe_adapter *adapter, struct ifreq *ifr);
+void txgbe_ptp_start_cyclecounter(struct txgbe_adapter *adapter);
+void txgbe_ptp_reset(struct txgbe_adapter *adapter);
+void txgbe_ptp_check_pps_event(struct txgbe_adapter *adapter);
+
/**
* interrupt masking operations. each bit in PX_ICn correspond to a interrupt.
* disable a interrupt by writing to PX_IMS with the corresponding bit=1
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
index ea17747c0df9..b225417c27d5 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_main.c
@@ -459,12 +459,13 @@ static bool txgbe_clean_tx_irq(struct txgbe_q_vector *q_vector,
" next_to_use <%x>\n"
" next_to_clean <%x>\n"
"tx_buffer_info[next_to_clean]\n"
+ " time_stamp <%lx>\n"
" jiffies <%lx>\n",
tx_ring->queue_index,
rd32(hw, TXGBE_PX_TR_RP(tx_ring->reg_idx)),
rd32(hw, TXGBE_PX_TR_WP(tx_ring->reg_idx)),
tx_ring->next_to_use, i,
- jiffies);
+ tx_ring->tx_buffer_info[i].time_stamp, jiffies);
pci_read_config_word(adapter->pdev, PCI_VENDOR_ID, &value);
if (value == TXGBE_FAILED_READ_CFG_WORD)
@@ -735,17 +736,25 @@ static void txgbe_rx_vlan(struct txgbe_ring *ring,
* @skb: pointer to current skb being populated
*
* This function checks the ring, descriptor, and packet information in
- * order to populate the hash, checksum, VLAN, protocol, and
+ * order to populate the hash, checksum, VLAN, timestamp, protocol, and
* other fields within the skb.
**/
static void txgbe_process_skb_fields(struct txgbe_ring *rx_ring,
union txgbe_rx_desc *rx_desc,
struct sk_buff *skb)
{
+ u32 flags = rx_ring->q_vector->adapter->flags;
+
txgbe_update_rsc_stats(rx_ring, skb);
txgbe_rx_hash(rx_ring, rx_desc, skb);
txgbe_rx_checksum(rx_ring, rx_desc, skb);
+ if (unlikely(flags & TXGBE_FLAG_RX_HWTSTAMP_ENABLED) &&
+ unlikely(txgbe_test_staterr(rx_desc, TXGBE_RXD_STAT_TS))) {
+ txgbe_ptp_rx_hwtstamp(rx_ring->q_vector->adapter, skb);
+ rx_ring->last_rx_timestamp = jiffies;
+ }
+
txgbe_rx_vlan(rx_ring, rx_desc, skb);
skb_record_rx_queue(skb, rx_ring->queue_index);
@@ -1491,6 +1500,8 @@ void txgbe_irq_enable(struct txgbe_adapter *adapter, bool queues, bool flush)
!(adapter->flags2 & TXGBE_FLAG2_FDIR_REQUIRES_REINIT))
mask |= TXGBE_PX_MISC_IEN_FLOW_DIR;
+ mask |= TXGBE_PX_MISC_IEN_TIMESYNC;
+
wr32(&adapter->hw, TXGBE_PX_MISC_IEN, mask);
/* unmask interrupt */
@@ -1559,6 +1570,9 @@ static irqreturn_t txgbe_msix_other(int __always_unused irq, void *data)
txgbe_check_sfp_event(adapter, eicr);
txgbe_check_overtemp_event(adapter, eicr);
+ if (unlikely(eicr & TXGBE_PX_MISC_IC_TIMESYNC))
+ txgbe_ptp_check_pps_event(adapter);
+
/* re-enable the original interrupt state, no lsc, no queues */
if (!test_bit(__TXGBE_DOWN, &adapter->state))
txgbe_irq_enable(adapter, false, false);
@@ -1747,6 +1761,9 @@ static irqreturn_t txgbe_intr(int __always_unused irq, void *data)
txgbe_check_sfp_event(adapter, eicr_misc);
txgbe_check_overtemp_event(adapter, eicr_misc);
+ if (unlikely(eicr_misc & TXGBE_PX_MISC_IC_TIMESYNC))
+ txgbe_ptp_check_pps_event(adapter);
+
adapter->isb_mem[TXGBE_ISB_MISC] = 0;
/* would disable interrupts here but it is auto disabled */
napi_schedule_irqoff(&q_vector->napi);
@@ -3193,6 +3210,9 @@ void txgbe_reset(struct txgbe_adapter *adapter)
/* update SAN MAC vmdq pool selection */
TCALL(hw, mac.ops.set_vmdq_san_mac, 0);
+
+ if (test_bit(__TXGBE_PTP_RUNNING, &adapter->state))
+ txgbe_ptp_reset(adapter);
}
/**
@@ -3865,6 +3885,8 @@ int txgbe_open(struct net_device *netdev)
if (err)
goto err_set_queues;
+ txgbe_ptp_init(adapter);
+
txgbe_up_complete(adapter);
txgbe_clear_vxlan_port(adapter);
@@ -3898,6 +3920,8 @@ static void txgbe_close_suspend(struct txgbe_adapter *adapter)
{
struct txgbe_hw *hw = &adapter->hw;
+ txgbe_ptp_suspend(adapter);
+
txgbe_disable_device(adapter);
if (!((hw->subsystem_device_id & TXGBE_NCSI_MASK) == TXGBE_NCSI_SUP))
TCALL(hw, mac.ops.disable_tx_laser);
@@ -3926,6 +3950,8 @@ int txgbe_close(struct net_device *netdev)
{
struct txgbe_adapter *adapter = netdev_priv(netdev);
+ txgbe_ptp_stop(adapter);
+
txgbe_down(adapter);
txgbe_free_irq(adapter);
@@ -4264,6 +4290,11 @@ static void txgbe_watchdog_update_link(struct txgbe_adapter *adapter)
TCALL(hw, mac.ops.fc_enable);
txgbe_set_rx_drop_en(adapter);
+ adapter->last_rx_ptp_check = jiffies;
+
+ if (test_bit(__TXGBE_PTP_RUNNING, &adapter->state))
+ txgbe_ptp_start_cyclecounter(adapter);
+
if (link_speed & TXGBE_LINK_SPEED_10GB_FULL) {
wr32(hw, TXGBE_MAC_TX_CFG,
(rd32(hw, TXGBE_MAC_TX_CFG) &
@@ -4341,6 +4372,9 @@ static void txgbe_watchdog_link_is_down(struct txgbe_adapter *adapter)
if (!netif_carrier_ok(netdev))
return;
+ if (test_bit(__TXGBE_PTP_RUNNING, &adapter->state))
+ txgbe_ptp_start_cyclecounter(adapter);
+
txgbe_info(drv, "NIC Link is Down\n");
netif_carrier_off(netdev);
netif_tx_stop_all_queues(netdev);
@@ -4641,6 +4675,12 @@ static void txgbe_service_task(struct work_struct *work)
txgbe_watchdog_subtask(adapter);
txgbe_fdir_reinit_subtask(adapter);
txgbe_check_hang_subtask(adapter);
+ if (test_bit(__TXGBE_PTP_RUNNING, &adapter->state)) {
+ txgbe_ptp_overflow_check(adapter);
+ if (unlikely(adapter->flags &
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER))
+ txgbe_ptp_rx_hang(adapter);
+ }
txgbe_service_event_complete(adapter);
}
@@ -5102,6 +5142,10 @@ static u32 txgbe_tx_cmd_type(u32 tx_flags)
cmd_type |= TXGBE_SET_FLAG(tx_flags, TXGBE_TX_FLAGS_TSO,
TXGBE_TXD_TSE);
+ /* set timestamp bit if present */
+ cmd_type |= TXGBE_SET_FLAG(tx_flags, TXGBE_TX_FLAGS_TSTAMP,
+ TXGBE_TXD_MAC_TSTAMP);
+
cmd_type |= TXGBE_SET_FLAG(tx_flags, TXGBE_TX_FLAGS_LINKSEC,
TXGBE_TXD_LINKSEC);
@@ -5255,6 +5299,11 @@ static int txgbe_tx_map(struct txgbe_ring *tx_ring,
netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);
+ /* set the timestamp */
+ first->time_stamp = jiffies;
+
+ skb_tx_timestamp(skb);
+
/* Force memory writes to complete before letting h/w know there
* are new descriptors to fetch. (Only applicable for weak-ordered
* memory model archs, such as IA-64).
@@ -5509,6 +5558,22 @@ netdev_tx_t txgbe_xmit_frame_ring(struct sk_buff *skb,
vlan_addlen += VLAN_HLEN;
}
+ if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
+ adapter->ptp_clock) {
+ if (!test_and_set_bit_lock(__TXGBE_PTP_TX_IN_PROGRESS,
+ &adapter->state)) {
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+ tx_flags |= TXGBE_TX_FLAGS_TSTAMP;
+
+ /* schedule check for Tx timestamp */
+ adapter->ptp_tx_skb = skb_get(skb);
+ adapter->ptp_tx_start = jiffies;
+ schedule_work(&adapter->ptp_tx_work);
+ } else {
+ adapter->tx_hwtstamp_skipped++;
+ }
+ }
+
/* record initial flags and protocol */
first->tx_flags = tx_flags;
first->protocol = protocol;
@@ -5525,7 +5590,8 @@ netdev_tx_t txgbe_xmit_frame_ring(struct sk_buff *skb,
if (test_bit(__TXGBE_TX_FDIR_INIT_DONE, &tx_ring->state))
txgbe_atr(tx_ring, first, dptype);
- txgbe_tx_map(tx_ring, first, hdr_len);
+ if (txgbe_tx_map(tx_ring, first, hdr_len))
+ goto cleanup_tx_tstamp;
return NETDEV_TX_OK;
@@ -5533,6 +5599,14 @@ netdev_tx_t txgbe_xmit_frame_ring(struct sk_buff *skb,
dev_kfree_skb_any(first->skb);
first->skb = NULL;
+cleanup_tx_tstamp:
+ if (unlikely(tx_flags & TXGBE_TX_FLAGS_TSTAMP)) {
+ dev_kfree_skb_any(adapter->ptp_tx_skb);
+ adapter->ptp_tx_skb = NULL;
+ cancel_work_sync(&adapter->ptp_tx_work);
+ clear_bit_unlock(__TXGBE_PTP_TX_IN_PROGRESS, &adapter->state);
+ }
+
return NETDEV_TX_OK;
}
@@ -5632,6 +5706,20 @@ static int txgbe_del_sanmac_netdev(struct net_device *dev)
return err;
}
+static int txgbe_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+ struct txgbe_adapter *adapter = netdev_priv(netdev);
+
+ switch (cmd) {
+ case SIOCGHWTSTAMP:
+ return txgbe_ptp_get_ts_config(adapter, ifr);
+ case SIOCSHWTSTAMP:
+ return txgbe_ptp_set_ts_config(adapter, ifr);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
void txgbe_do_reset(struct net_device *netdev)
{
struct txgbe_adapter *adapter = netdev_priv(netdev);
@@ -5805,6 +5893,7 @@ static const struct net_device_ops txgbe_netdev_ops = {
.ndo_tx_timeout = txgbe_tx_timeout,
.ndo_vlan_rx_add_vid = txgbe_vlan_rx_add_vid,
.ndo_vlan_rx_kill_vid = txgbe_vlan_rx_kill_vid,
+ .ndo_eth_ioctl = txgbe_ioctl,
.ndo_get_stats64 = txgbe_get_stats64,
.ndo_fdb_add = txgbe_ndo_fdb_add,
.ndo_features_check = txgbe_features_check,
diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_ptp.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_ptp.c
new file mode 100644
index 000000000000..11184c725c2e
--- /dev/null
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_ptp.c
@@ -0,0 +1,840 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2015 - 2017 Beijing WangXun Technology Co., Ltd. */
+
+#include "txgbe.h"
+#include <linux/ptp_classify.h>
+
+/**
+ * SYSTIME is defined by a fixed point system which allows the user to
+ * define the scale counter increment value at every level change of
+ * the oscillator driving SYSTIME value. The time unit is determined by
+ * the clock frequency of the oscillator and TIMINCA register.
+ * The cyclecounter and timecounter structures are used to to convert
+ * the scale counter into nanoseconds. SYSTIME registers need to be converted
+ * to ns values by use of only a right shift.
+ * The following math determines the largest incvalue that will fit into
+ * the available bits in the TIMINCA register:
+ * Period * [ 2 ^ ( MaxWidth - PeriodWidth ) ]
+ * PeriodWidth: Number of bits to store the clock period
+ * MaxWidth: The maximum width value of the TIMINCA register
+ * Period: The clock period for the oscillator, which changes based on the link
+ * speed:
+ * At 10Gb link or no link, the period is 6.4 ns.
+ * At 1Gb link, the period is multiplied by 10. (64ns)
+ * At 100Mb link, the period is multiplied by 100. (640ns)
+ * round(): discard the fractional portion of the calculation
+ *
+ * The calculated value allows us to right shift the SYSTIME register
+ * value in order to quickly convert it into a nanosecond clock,
+ * while allowing for the maximum possible adjustment value.
+ *
+ * LinkSpeed ClockFreq ClockPeriod TIMINCA:IV
+ * 10000Mbps 156.25MHz 6.4*10^-9 0xCCCCCC(0xFFFFF/ns)
+ * 1000 Mbps 62.5 MHz 16 *10^-9 0x800000(0x7FFFF/ns)
+ * 100 Mbps 6.25 MHz 160*10^-9 0xA00000(0xFFFF/ns)
+ * 10 Mbps 0.625 MHz 1600*10^-9 0xC7F380(0xFFF/ns)
+ * FPGA 31.25 MHz 32 *10^-9 0x800000(0x3FFFF/ns)
+ *
+ * These diagrams are only for the 10Gb link period
+ *
+ * +--------------+ +--------------+
+ * | 32 | | 8 | 3 | 20 |
+ * *--------------+ +--------------+
+ * \________ 43 bits ______/ fract
+ *
+ * The 43 bit SYSTIME overflows every
+ * 2^43 * 10^-9 / 3600 = 2.4 hours
+ **/
+#define TXGBE_INCVAL_10GB 0xCCCCCC
+#define TXGBE_INCVAL_1GB 0x800000
+#define TXGBE_INCVAL_100 0xA00000
+#define TXGBE_INCVAL_10 0xC7F380
+#define TXGBE_INCVAL_FPGA 0x800000
+
+#define TXGBE_INCVAL_SHIFT_10GB 20
+#define TXGBE_INCVAL_SHIFT_1GB 18
+#define TXGBE_INCVAL_SHIFT_100 15
+#define TXGBE_INCVAL_SHIFT_10 12
+#define TXGBE_INCVAL_SHIFT_FPGA 17
+
+#define TXGBE_OVERFLOW_PERIOD (HZ * 30)
+#define TXGBE_PTP_TX_TIMEOUT (HZ)
+
+/**
+ * txgbe_ptp_read - read raw cycle counter (to be used by time counter)
+ * @hw_cc: the cyclecounter structure
+ *
+ * this function reads the cyclecounter registers and is called by the
+ * cyclecounter structure used to construct a ns counter from the
+ * arbitrary fixed point registers
+ */
+static u64 txgbe_ptp_read(const struct cyclecounter *hw_cc)
+{
+ struct txgbe_adapter *adapter =
+ container_of(hw_cc, struct txgbe_adapter, hw_cc);
+ struct txgbe_hw *hw = &adapter->hw;
+ u64 stamp = 0;
+
+ stamp |= (u64)rd32(hw, TXGBE_TSC_1588_SYSTIML);
+ stamp |= (u64)rd32(hw, TXGBE_TSC_1588_SYSTIMH) << 32;
+
+ return stamp;
+}
+
+/**
+ * txgbe_ptp_convert_to_hwtstamp - convert register value to hw timestamp
+ * @adapter: private adapter structure
+ * @hwtstamp: stack timestamp structure
+ * @systim: unsigned 64bit system time value
+ *
+ * We need to convert the adapter's RX/TXSTMP registers into a hwtstamp value
+ * which can be used by the stack's ptp functions.
+ *
+ * The lock is used to protect consistency of the cyclecounter and the SYSTIME
+ * registers. However, it does not need to protect against the Rx or Tx
+ * timestamp registers, as there can't be a new timestamp until the old one is
+ * unlatched by reading.
+ *
+ * In addition to the timestamp in hardware, some controllers need a software
+ * overflow cyclecounter, and this function takes this into account as well.
+ **/
+static void txgbe_ptp_convert_to_hwtstamp(struct txgbe_adapter *adapter,
+ struct skb_shared_hwtstamps *hwtstamp,
+ u64 timestamp)
+{
+ unsigned long flags;
+ u64 ns;
+
+ memset(hwtstamp, 0, sizeof(*hwtstamp));
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_cyc2time(&adapter->hw_tc, timestamp);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ hwtstamp->hwtstamp = ns_to_ktime(ns);
+}
+
+/**
+ * txgbe_ptp_adjfreq
+ * @ptp: the ptp clock structure
+ * @ppb: parts per billion adjustment from base
+ *
+ * adjust the frequency of the ptp cycle counter by the
+ * indicated ppb from the base frequency.
+ */
+static int txgbe_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+ struct txgbe_adapter *adapter =
+ container_of(ptp, struct txgbe_adapter, ptp_caps);
+ struct txgbe_hw *hw = &adapter->hw;
+ u64 freq, incval;
+ u32 diff;
+ int neg_adj = 0;
+
+ if (ppb < 0) {
+ neg_adj = 1;
+ ppb = -ppb;
+ }
+
+ smp_mb();
+ incval = READ_ONCE(adapter->base_incval);
+
+ freq = incval;
+ freq *= ppb;
+ diff = div_u64(freq, 1000000000ULL);
+
+ incval = neg_adj ? (incval - diff) : (incval + diff);
+
+ if (incval > TXGBE_TSC_1588_INC_IV(~0))
+ txgbe_dev_warn("PTP ppb adjusted SYSTIME rate overflowed!\n");
+ wr32(hw, TXGBE_TSC_1588_INC,
+ TXGBE_TSC_1588_INC_IVP(incval, 2));
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_adjtime
+ * @ptp: the ptp clock structure
+ * @delta: offset to adjust the cycle counter by ns
+ *
+ * adjust the timer by resetting the timecounter structure.
+ */
+static int txgbe_ptp_adjtime(struct ptp_clock_info *ptp,
+ s64 delta)
+{
+ struct txgbe_adapter *adapter =
+ container_of(ptp, struct txgbe_adapter, ptp_caps);
+ unsigned long flags;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ timecounter_adjtime(&adapter->hw_tc, delta);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_gettime64
+ * @ptp: the ptp clock structure
+ * @ts: timespec64 structure to hold the current time value
+ *
+ * read the timecounter and return the correct value on ns,
+ * after converting it into a struct timespec64.
+ */
+static int txgbe_ptp_gettime64(struct ptp_clock_info *ptp,
+ struct timespec64 *ts)
+{
+ struct txgbe_adapter *adapter =
+ container_of(ptp, struct txgbe_adapter, ptp_caps);
+ unsigned long flags;
+ u64 ns;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_read(&adapter->hw_tc);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ *ts = ns_to_timespec64(ns);
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_settime64
+ * @ptp: the ptp clock structure
+ * @ts: the timespec64 containing the new time for the cycle counter
+ *
+ * reset the timecounter to use a new base value instead of the kernel
+ * wall timer value.
+ */
+static int txgbe_ptp_settime64(struct ptp_clock_info *ptp,
+ const struct timespec64 *ts)
+{
+ struct txgbe_adapter *adapter =
+ container_of(ptp, struct txgbe_adapter, ptp_caps);
+ u64 ns;
+ unsigned long flags;
+
+ ns = timespec64_to_ns(ts);
+
+ /* reset the timecounter */
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ timecounter_init(&adapter->hw_tc, &adapter->hw_cc, ns);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_check_pps_event
+ * @adapter: the private adapter structure
+ * @eicr: the interrupt cause register value
+ *
+ * This function is called by the interrupt routine when checking for
+ * interrupts. It will check and handle a pps event.
+ */
+void txgbe_ptp_check_pps_event(struct txgbe_adapter *adapter)
+{
+ struct ptp_clock_event event;
+
+ event.type = PTP_CLOCK_PPS;
+
+ /* this check is necessary in case the interrupt was enabled via some
+ * alternative means (ex. debug_fs). Better to check here than
+ * everywhere that calls this function.
+ */
+ if (!adapter->ptp_clock)
+ return;
+
+ /* we don't config PPS on SDP yet, so just return.
+ * ptp_clock_event(adapter->ptp_clock, &event);
+ */
+}
+
+/**
+ * txgbe_ptp_overflow_check - watchdog task to detect SYSTIME overflow
+ * @adapter: private adapter struct
+ *
+ * this watchdog task periodically reads the timecounter
+ * in order to prevent missing when the system time registers wrap
+ * around. This needs to be run approximately twice a minute for the fastest
+ * overflowing hardware. We run it for all hardware since it shouldn't have a
+ * large impact.
+ */
+void txgbe_ptp_overflow_check(struct txgbe_adapter *adapter)
+{
+ bool timeout = time_is_before_jiffies(adapter->last_overflow_check +
+ TXGBE_OVERFLOW_PERIOD);
+ struct timespec64 ts;
+
+ if (timeout) {
+ txgbe_ptp_gettime64(&adapter->ptp_caps, &ts);
+ adapter->last_overflow_check = jiffies;
+ }
+}
+
+/**
+ * txgbe_ptp_rx_hang - detect error case when Rx timestamp registers latched
+ * @adapter: private network adapter structure
+ *
+ * this watchdog task is scheduled to detect error case where hardware has
+ * dropped an Rx packet that was timestamped when the ring is full. The
+ * particular error is rare but leaves the device in a state unable to timestamp
+ * any future packets.
+ */
+void txgbe_ptp_rx_hang(struct txgbe_adapter *adapter)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+ struct txgbe_ring *rx_ring;
+ u32 tsyncrxctl = rd32(hw, TXGBE_PSR_1588_CTL);
+ unsigned long rx_event;
+ int n;
+
+ /* if we don't have a valid timestamp in the registers, just update the
+ * timeout counter and exit
+ */
+ if (!(tsyncrxctl & TXGBE_PSR_1588_CTL_VALID)) {
+ adapter->last_rx_ptp_check = jiffies;
+ return;
+ }
+
+ /* determine the most recent watchdog or rx_timestamp event */
+ rx_event = adapter->last_rx_ptp_check;
+ for (n = 0; n < adapter->num_rx_queues; n++) {
+ rx_ring = adapter->rx_ring[n];
+ if (time_after(rx_ring->last_rx_timestamp, rx_event))
+ rx_event = rx_ring->last_rx_timestamp;
+ }
+
+ /* only need to read the high RXSTMP register to clear the lock */
+ if (time_is_before_jiffies(rx_event + 5 * HZ)) {
+ rd32(hw, TXGBE_PSR_1588_STMPH);
+ adapter->last_rx_ptp_check = jiffies;
+
+ adapter->rx_hwtstamp_cleared++;
+ txgbe_warn(drv, "clearing RX Timestamp hang");
+ }
+}
+
+/**
+ * txgbe_ptp_clear_tx_timestamp - utility function to clear Tx timestamp state
+ * @adapter: the private adapter structure
+ *
+ * This function should be called whenever the state related to a Tx timestamp
+ * needs to be cleared. This helps ensure that all related bits are reset for
+ * the next Tx timestamp event.
+ */
+static void txgbe_ptp_clear_tx_timestamp(struct txgbe_adapter *adapter)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+
+ rd32(hw, TXGBE_TSC_1588_STMPH);
+ if (adapter->ptp_tx_skb) {
+ dev_kfree_skb_any(adapter->ptp_tx_skb);
+ adapter->ptp_tx_skb = NULL;
+ }
+ clear_bit_unlock(__TXGBE_PTP_TX_IN_PROGRESS, &adapter->state);
+}
+
+/**
+ * txgbe_ptp_tx_hwtstamp - utility function which checks for TX time stamp
+ * @adapter: the private adapter struct
+ *
+ * if the timestamp is valid, we convert it into the timecounter ns
+ * value, then store that result into the shhwtstamps structure which
+ * is passed up the network stack
+ */
+static void txgbe_ptp_tx_hwtstamp(struct txgbe_adapter *adapter)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+ struct skb_shared_hwtstamps shhwtstamps;
+ u64 regval = 0;
+
+ regval |= (u64)rd32(hw, TXGBE_TSC_1588_STMPL);
+ regval |= (u64)rd32(hw, TXGBE_TSC_1588_STMPH) << 32;
+
+ txgbe_ptp_convert_to_hwtstamp(adapter, &shhwtstamps, regval);
+ skb_tstamp_tx(adapter->ptp_tx_skb, &shhwtstamps);
+
+ txgbe_ptp_clear_tx_timestamp(adapter);
+}
+
+/**
+ * txgbe_ptp_tx_hwtstamp_work
+ * @work: pointer to the work struct
+ *
+ * This work item polls TSYNCTXCTL valid bit to determine when a Tx hardware
+ * timestamp has been taken for the current skb. It is necessary, because the
+ * descriptor's "done" bit does not correlate with the timestamp event.
+ */
+static void txgbe_ptp_tx_hwtstamp_work(struct work_struct *work)
+{
+ struct txgbe_adapter *adapter = container_of(work, struct txgbe_adapter,
+ ptp_tx_work);
+ struct txgbe_hw *hw = &adapter->hw;
+ bool timeout = time_is_before_jiffies(adapter->ptp_tx_start +
+ TXGBE_PTP_TX_TIMEOUT);
+ u32 tsynctxctl;
+
+ /* we have to have a valid skb to poll for a timestamp */
+ if (!adapter->ptp_tx_skb) {
+ txgbe_ptp_clear_tx_timestamp(adapter);
+ return;
+ }
+
+ /* stop polling once we have a valid timestamp */
+ tsynctxctl = rd32(hw, TXGBE_TSC_1588_CTL);
+ if (tsynctxctl & TXGBE_TSC_1588_CTL_VALID) {
+ txgbe_ptp_tx_hwtstamp(adapter);
+ return;
+ }
+
+ /* check timeout last in case timestamp event just occurred */
+ if (timeout) {
+ txgbe_ptp_clear_tx_timestamp(adapter);
+ adapter->tx_hwtstamp_timeouts++;
+ txgbe_warn(drv, "clearing Tx Timestamp hang");
+ } else {
+ /* reschedule to keep checking until we timeout */
+ schedule_work(&adapter->ptp_tx_work);
+ }
+}
+
+/**
+ * txgbe_ptp_rx_rgtstamp - utility function which checks for RX time stamp
+ * @q_vector: structure containing interrupt and ring information
+ * @skb: particular skb to send timestamp with
+ *
+ * if the timestamp is valid, we convert it into the timecounter ns
+ * value, then store that result into the shhwtstamps structure which
+ * is passed up the network stack
+ */
+void txgbe_ptp_rx_hwtstamp(struct txgbe_adapter *adapter, struct sk_buff *skb)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+ u64 regval = 0;
+ u32 tsyncrxctl;
+
+ /* Read the tsyncrxctl register afterwards in order to prevent taking an
+ * I/O hit on every packet.
+ */
+ tsyncrxctl = rd32(hw, TXGBE_PSR_1588_CTL);
+ if (!(tsyncrxctl & TXGBE_PSR_1588_CTL_VALID))
+ return;
+
+ regval |= (u64)rd32(hw, TXGBE_PSR_1588_STMPL);
+ regval |= (u64)rd32(hw, TXGBE_PSR_1588_STMPH) << 32;
+
+ txgbe_ptp_convert_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
+}
+
+/**
+ * txgbe_ptp_get_ts_config - get current hardware timestamping configuration
+ * @adapter: pointer to adapter structure
+ * @ifreq: ioctl data
+ *
+ * This function returns the current timestamping settings. Rather than
+ * attempt to deconstruct registers to fill in the values, simply keep a copy
+ * of the old settings around, and return a copy when requested.
+ */
+int txgbe_ptp_get_ts_config(struct txgbe_adapter *adapter, struct ifreq *ifr)
+{
+ struct hwtstamp_config *config = &adapter->tstamp_config;
+
+ return copy_to_user(ifr->ifr_data, config,
+ sizeof(*config)) ? -EFAULT : 0;
+}
+
+/**
+ * txgbe_ptp_set_timestamp_mode - setup the hardware for the requested mode
+ * @adapter: the private txgbe adapter structure
+ * @config: the hwtstamp configuration requested
+ *
+ * Outgoing time stamping can be enabled and disabled. Play nice and
+ * disable it when requested, although it shouldn't cause any overhead
+ * when no packet needs it. At most one packet in the queue may be
+ * marked for time stamping, otherwise it would be impossible to tell
+ * for sure to which packet the hardware time stamp belongs.
+ *
+ * Incoming time stamping has to be configured via the hardware
+ * filters. Not all combinations are supported, in particular event
+ * type has to be specified. Matching the kind of event packet is
+ * not supported, with the exception of "all V2 events regardless of
+ * level 2 or 4".
+ *
+ * Since hardware always timestamps Path delay packets when timestamping V2
+ * packets, regardless of the type specified in the register, only use V2
+ * Event mode. This more accurately tells the user what the hardware is going
+ * to do anyways.
+ *
+ * Note: this may modify the hwtstamp configuration towards a more general
+ * mode, if required to support the specifically requested mode.
+ */
+static int txgbe_ptp_set_timestamp_mode(struct txgbe_adapter *adapter,
+ struct hwtstamp_config *config)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+ u32 tsync_tx_ctl = TXGBE_TSC_1588_CTL_ENABLED;
+ u32 tsync_rx_ctl = TXGBE_PSR_1588_CTL_ENABLED;
+ u32 tsync_rx_mtrl = PTP_EV_PORT << 16;
+ bool is_l2 = false;
+ u32 regval;
+
+ /* reserved for future extensions */
+ if (config->flags)
+ return -EINVAL;
+
+ switch (config->tx_type) {
+ case HWTSTAMP_TX_OFF:
+ tsync_tx_ctl = 0;
+ case HWTSTAMP_TX_ON:
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ switch (config->rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ tsync_rx_ctl = 0;
+ tsync_rx_mtrl = 0;
+ adapter->flags &= ~(TXGBE_FLAG_RX_HWTSTAMP_ENABLED |
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER);
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ tsync_rx_ctl |= TXGBE_PSR_1588_CTL_TYPE_L4_V1;
+ tsync_rx_mtrl |= TXGBE_PSR_1588_MSGTYPE_V1_SYNC_MSG;
+ adapter->flags |= (TXGBE_FLAG_RX_HWTSTAMP_ENABLED |
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER);
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ tsync_rx_ctl |= TXGBE_PSR_1588_CTL_TYPE_L4_V1;
+ tsync_rx_mtrl |= TXGBE_PSR_1588_MSGTYPE_V1_DELAY_REQ_MSG;
+ adapter->flags |= (TXGBE_FLAG_RX_HWTSTAMP_ENABLED |
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER);
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+ tsync_rx_ctl |= TXGBE_PSR_1588_CTL_TYPE_EVENT_V2;
+ is_l2 = true;
+ config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+ adapter->flags |= (TXGBE_FLAG_RX_HWTSTAMP_ENABLED |
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER);
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_ALL:
+ default:
+ /* register RXMTRL must be set in order to do V1 packets,
+ * therefore it is not possible to time stamp both V1 Sync and
+ * Delay_Req messages unless hardware supports timestamping all
+ * packets => return error
+ */
+ adapter->flags &= ~(TXGBE_FLAG_RX_HWTSTAMP_ENABLED |
+ TXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER);
+ config->rx_filter = HWTSTAMP_FILTER_NONE;
+ return -ERANGE;
+ }
+
+ /* define ethertype filter for timestamping L2 packets */
+ if (is_l2)
+ wr32(hw,
+ TXGBE_PSR_ETYPE_SWC(TXGBE_PSR_ETYPE_SWC_FILTER_1588),
+ (TXGBE_PSR_ETYPE_SWC_FILTER_EN | /* enable filter */
+ TXGBE_PSR_ETYPE_SWC_1588 | /* enable timestamping */
+ ETH_P_1588)); /* 1588 eth protocol type */
+ else
+ wr32(hw,
+ TXGBE_PSR_ETYPE_SWC(TXGBE_PSR_ETYPE_SWC_FILTER_1588),
+ 0);
+
+ /* enable/disable TX */
+ regval = rd32(hw, TXGBE_TSC_1588_CTL);
+ regval &= ~TXGBE_TSC_1588_CTL_ENABLED;
+ regval |= tsync_tx_ctl;
+ wr32(hw, TXGBE_TSC_1588_CTL, regval);
+
+ /* enable/disable RX */
+ regval = rd32(hw, TXGBE_PSR_1588_CTL);
+ regval &= ~(TXGBE_PSR_1588_CTL_ENABLED | TXGBE_PSR_1588_CTL_TYPE_MASK);
+ regval |= tsync_rx_ctl;
+ wr32(hw, TXGBE_PSR_1588_CTL, regval);
+
+ /* define which PTP packets are time stamped */
+ wr32(hw, TXGBE_PSR_1588_MSGTYPE, tsync_rx_mtrl);
+
+ TXGBE_WRITE_FLUSH(hw);
+
+ /* clear TX/RX timestamp state, just to be sure */
+ txgbe_ptp_clear_tx_timestamp(adapter);
+ rd32(hw, TXGBE_PSR_1588_STMPH);
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_set_ts_config - user entry point for timestamp mode
+ * @adapter: pointer to adapter struct
+ * @ifreq: ioctl data
+ *
+ * Set hardware to requested mode. If unsupported, return an error with no
+ * changes. Otherwise, store the mode for future reference.
+ */
+int txgbe_ptp_set_ts_config(struct txgbe_adapter *adapter, struct ifreq *ifr)
+{
+ struct hwtstamp_config config;
+ int err;
+
+ if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ err = txgbe_ptp_set_timestamp_mode(adapter, &config);
+ if (err)
+ return err;
+
+ /* save these settings for future reference */
+ memcpy(&adapter->tstamp_config, &config,
+ sizeof(adapter->tstamp_config));
+
+ return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+static void txgbe_ptp_link_speed_adjust(struct txgbe_adapter *adapter,
+ u32 *shift, u32 *incval)
+{
+ /**
+ * Scale the NIC cycle counter by a large factor so that
+ * relatively small corrections to the frequency can be added
+ * or subtracted. The drawbacks of a large factor include
+ * (a) the clock register overflows more quickly, (b) the cycle
+ * counter structure must be able to convert the systime value
+ * to nanoseconds using only a multiplier and a right-shift,
+ * and (c) the value must fit within the timinca register space
+ * => math based on internal DMA clock rate and available bits
+ *
+ * Note that when there is no link, internal DMA clock is same as when
+ * link speed is 10Gb. Set the registers correctly even when link is
+ * down to preserve the clock setting
+ */
+ switch (adapter->link_speed) {
+ case TXGBE_LINK_SPEED_10_FULL:
+ *shift = TXGBE_INCVAL_SHIFT_10;
+ *incval = TXGBE_INCVAL_10;
+ break;
+ case TXGBE_LINK_SPEED_100_FULL:
+ *shift = TXGBE_INCVAL_SHIFT_100;
+ *incval = TXGBE_INCVAL_100;
+ break;
+ case TXGBE_LINK_SPEED_1GB_FULL:
+ *shift = TXGBE_INCVAL_SHIFT_1GB;
+ *incval = TXGBE_INCVAL_1GB;
+ break;
+ case TXGBE_LINK_SPEED_10GB_FULL:
+ default: /* TXGBE_LINK_SPEED_10GB_FULL */
+ *shift = TXGBE_INCVAL_SHIFT_10GB;
+ *incval = TXGBE_INCVAL_10GB;
+ break;
+ }
+}
+
+/**
+ * txgbe_ptp_start_cyclecounter - create the cycle counter from hw
+ * @adapter: pointer to the adapter structure
+ *
+ * This function should be called to set the proper values for the TIMINCA
+ * register and tell the cyclecounter structure what the tick rate of SYSTIME
+ * is. It does not directly modify SYSTIME registers or the timecounter
+ * structure. It should be called whenever a new TIMINCA value is necessary,
+ * such as during initialization or when the link speed changes.
+ */
+void txgbe_ptp_start_cyclecounter(struct txgbe_adapter *adapter)
+{
+ struct txgbe_hw *hw = &adapter->hw;
+ unsigned long flags;
+ struct cyclecounter cc;
+ u32 incval = 0;
+
+ /* For some of the boards below this mask is technically incorrect.
+ * The timestamp mask overflows at approximately 61bits. However the
+ * particular hardware does not overflow on an even bitmask value.
+ * Instead, it overflows due to conversion of upper 32bits billions of
+ * cycles. Timecounters are not really intended for this purpose so
+ * they do not properly function if the overflow point isn't 2^N-1.
+ * However, the actual SYSTIME values in question take ~138 years to
+ * overflow. In practice this means they won't actually overflow. A
+ * proper fix to this problem would require modification of the
+ * timecounter delta calculations.
+ */
+ cc.mask = CLOCKSOURCE_MASK(64);
+ cc.mult = 1;
+ cc.shift = 0;
+
+ cc.read = txgbe_ptp_read;
+ txgbe_ptp_link_speed_adjust(adapter, &cc.shift, &incval);
+ wr32(hw, TXGBE_TSC_1588_INC,
+ TXGBE_TSC_1588_INC_IVP(incval, 2));
+
+ /* update the base incval used to calculate frequency adjustment */
+ WRITE_ONCE(adapter->base_incval, incval);
+ smp_mb();
+
+ /* need lock to prevent incorrect read while modifying cyclecounter */
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ memcpy(&adapter->hw_cc, &cc, sizeof(adapter->hw_cc));
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+}
+
+/**
+ * txgbe_ptp_reset
+ * @adapter: the txgbe private board structure
+ *
+ * When the MAC resets, all of the hardware configuration for timesync is
+ * reset. This function should be called to re-enable the device for PTP,
+ * using the last known settings. However, we do lose the current clock time,
+ * so we fallback to resetting it based on the kernel's realtime clock.
+ *
+ * This function will maintain the hwtstamp_config settings, and it retriggers
+ * the SDP output if it's enabled.
+ */
+void txgbe_ptp_reset(struct txgbe_adapter *adapter)
+{
+ unsigned long flags;
+
+ /* reset the hardware timestamping mode */
+ txgbe_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);
+ txgbe_ptp_start_cyclecounter(adapter);
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ timecounter_init(&adapter->hw_tc, &adapter->hw_cc,
+ ktime_to_ns(ktime_get_real()));
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ adapter->last_overflow_check = jiffies;
+}
+
+/**
+ * txgbe_ptp_create_clock
+ * @adapter: the txgbe private adapter structure
+ *
+ * This function performs setup of the user entry point function table and
+ * initalizes the PTP clock device used by userspace to access the clock-like
+ * features of the PTP core. It will be called by txgbe_ptp_init, and may
+ * re-use a previously initialized clock (such as during a suspend/resume
+ * cycle).
+ */
+
+static long txgbe_ptp_create_clock(struct txgbe_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+ long err;
+
+ /* do nothing if we already have a clock device */
+ if (!IS_ERR_OR_NULL(adapter->ptp_clock))
+ return 0;
+
+ snprintf(adapter->ptp_caps.name, sizeof(adapter->ptp_caps.name),
+ "%s", netdev->name);
+ adapter->ptp_caps.owner = THIS_MODULE;
+ adapter->ptp_caps.max_adj = 250000000; /* 10^-9s */
+ adapter->ptp_caps.n_alarm = 0;
+ adapter->ptp_caps.n_ext_ts = 0;
+ adapter->ptp_caps.n_per_out = 0;
+ adapter->ptp_caps.pps = 0;
+ adapter->ptp_caps.adjfreq = txgbe_ptp_adjfreq;
+ adapter->ptp_caps.adjtime = txgbe_ptp_adjtime;
+ adapter->ptp_caps.gettime64 = txgbe_ptp_gettime64;
+ adapter->ptp_caps.settime64 = txgbe_ptp_settime64;
+
+ adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
+ pci_dev_to_dev(adapter->pdev));
+ if (IS_ERR(adapter->ptp_clock)) {
+ err = PTR_ERR(adapter->ptp_clock);
+ adapter->ptp_clock = NULL;
+ txgbe_dev_err("ptp_clock_register failed\n");
+ return err;
+ }
+
+ txgbe_dev_info("registered PHC device on %s\n", netdev->name);
+
+ /* Set the default timestamp mode to disabled here. We do this in
+ * create_clock instead of initialization, because we don't want to
+ * override the previous settings during a suspend/resume cycle.
+ */
+ adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
+ adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
+
+ return 0;
+}
+
+/**
+ * txgbe_ptp_init
+ * @adapter: the txgbe private adapter structure
+ *
+ * This function performs the required steps for enabling ptp
+ * support. If ptp support has already been loaded it simply calls the
+ * cyclecounter init routine and exits.
+ */
+void txgbe_ptp_init(struct txgbe_adapter *adapter)
+{
+ /* initialize the spin lock first, since the user might call the clock
+ * functions any time after we've initialized the ptp clock device.
+ */
+ spin_lock_init(&adapter->tmreg_lock);
+
+ /* obtain a ptp clock device, or re-use an existing device */
+ if (txgbe_ptp_create_clock(adapter))
+ return;
+
+ /* we have a clock, so we can initialize work for timestamps now */
+ INIT_WORK(&adapter->ptp_tx_work, txgbe_ptp_tx_hwtstamp_work);
+
+ /* reset the ptp related hardware bits */
+ txgbe_ptp_reset(adapter);
+
+ /* enter the TXGBE_PTP_RUNNING state */
+ set_bit(__TXGBE_PTP_RUNNING, &adapter->state);
+}
+
+/**
+ * txgbe_ptp_suspend - stop ptp work items
+ * @adapter: pointer to adapter struct
+ *
+ * This function suspends ptp activity, and prevents more work from being
+ * generated, but does not destroy the clock device.
+ */
+void txgbe_ptp_suspend(struct txgbe_adapter *adapter)
+{
+ /* leave the TXGBE_PTP_RUNNING STATE */
+ if (!test_and_clear_bit(__TXGBE_PTP_RUNNING, &adapter->state))
+ return;
+
+ cancel_work_sync(&adapter->ptp_tx_work);
+ txgbe_ptp_clear_tx_timestamp(adapter);
+}
+
+/**
+ * txgbe_ptp_stop - destroy the ptp_clock device
+ * @adapter: pointer to adapter struct
+ *
+ * Completely destroy the ptp_clock device, and disable all PTP related
+ * features. Intended to be run when the device is being closed.
+ */
+void txgbe_ptp_stop(struct txgbe_adapter *adapter)
+{
+ /* first, suspend ptp activity */
+ txgbe_ptp_suspend(adapter);
+
+ /* now destroy the ptp clock device */
+ if (adapter->ptp_clock) {
+ ptp_clock_unregister(adapter->ptp_clock);
+ adapter->ptp_clock = NULL;
+ txgbe_dev_info("removed PHC on %s\n",
+ adapter->netdev->name);
+ }
+}
--
2.27.0
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