Quelle wx_ptp.c
Sprache: C
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2015 - 2025 Beijing WangXun Technology Co., Ltd. */
/* Copyright (c) 1999 - 2025 Intel Corporation. */
#include <linux/ptp_classify.h>
#include <linux/clocksource.h>
#include <linux/pci.h>
#include "wx_type.h"
#include "wx_ptp.h"
#include "wx_hw.h"
#define WX_INCVAL_10GB 0 xCCCCCC
#define WX_INCVAL_1GB 0 x800000
#define WX_INCVAL_100 0 xA00000
#define WX_INCVAL_10 0 xC7F380
#define WX_INCVAL_EM 0 x2000000
#define WX_INCVAL_AML 0 xA00000
#define WX_INCVAL_SHIFT_10GB 20
#define WX_INCVAL_SHIFT_1GB 18
#define WX_INCVAL_SHIFT_100 15
#define WX_INCVAL_SHIFT_10 12
#define WX_INCVAL_SHIFT_EM 22
#define WX_INCVAL_SHIFT_AML 21
#define WX_OVERFLOW_PERIOD (HZ * 30 )
#define WX_PTP_TX_TIMEOUT (HZ)
#define WX_1588_PPS_WIDTH_EM 120
#define WX_NS_PER_SEC 1000000000 ULL
static u64 wx_ptp_timecounter_cyc2time(struct wx *wx, u64 timestamp)
{
unsigned int seq;
u64 ns;
do {
seq = read_seqbegin(&wx->hw_tc_lock);
ns = timecounter_cyc2time(&wx->hw_tc, timestamp);
} while (read_seqretry(&wx->hw_tc_lock, seq));
return ns;
}
static u64 wx_ptp_readtime(struct wx *wx, struct ptp_system_timestamp *sts)
{
u32 timeh1, timeh2, timel;
timeh1 = rd32ptp(wx, WX_TSC_1588_SYSTIMH);
ptp_read_system_prets(sts);
timel = rd32ptp(wx, WX_TSC_1588_SYSTIML);
ptp_read_system_postts(sts);
timeh2 = rd32ptp(wx, WX_TSC_1588_SYSTIMH);
if (timeh1 != timeh2) {
ptp_read_system_prets(sts);
timel = rd32ptp(wx, WX_TSC_1588_SYSTIML);
ptp_read_system_prets(sts);
}
return (u64)timel | (u64)timeh2 << 32 ;
}
static int wx_ptp_adjfine(struct ptp_clock_info *ptp, long ppb)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
u64 incval, mask;
smp_mb(); /* Force any pending update before accessing. */
incval = READ_ONCE(wx->base_incval);
incval = adjust_by_scaled_ppm(incval, ppb);
mask = (wx->mac.type == wx_mac_em) ? 0 x7FFFFFF : 0 xFFFFFF;
incval &= mask;
if (wx->mac.type != wx_mac_em)
incval |= 2 << 24 ;
wr32ptp(wx, WX_TSC_1588_INC, incval);
return 0 ;
}
static int wx_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
unsigned long flags;
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
timecounter_adjtime(&wx->hw_tc, delta);
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
if (wx->ptp_setup_sdp)
wx->ptp_setup_sdp(wx);
return 0 ;
}
static int wx_ptp_gettimex64(struct ptp_clock_info *ptp,
struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
u64 ns, stamp;
stamp = wx_ptp_readtime(wx, sts);
ns = wx_ptp_timecounter_cyc2time(wx, stamp);
*ts = ns_to_timespec64(ns);
return 0 ;
}
static int wx_ptp_settime64(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
unsigned long flags;
u64 ns;
ns = timespec64_to_ns(ts);
/* reset the timecounter */
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
timecounter_init(&wx->hw_tc, &wx->hw_cc, ns);
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
if (wx->ptp_setup_sdp)
wx->ptp_setup_sdp(wx);
return 0 ;
}
/**
* wx_ptp_clear_tx_timestamp - utility function to clear Tx timestamp state
* @ wx : the private board 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 wx_ptp_clear_tx_timestamp(struct wx *wx)
{
rd32ptp(wx, WX_TSC_1588_STMPH);
if (wx->ptp_tx_skb) {
dev_kfree_skb_any(wx->ptp_tx_skb);
wx->ptp_tx_skb = NULL;
}
clear_bit_unlock(WX_STATE_PTP_TX_IN_PROGRESS, wx->state);
}
/**
* wx_ptp_convert_to_hwtstamp - convert register value to hw timestamp
* @ wx : private board structure
* @ hwtstamp : stack timestamp structure
* @ timestamp : unsigned 64 bit 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 wx_ptp_convert_to_hwtstamp(struct wx *wx,
struct skb_shared_hwtstamps *hwtstamp,
u64 timestamp)
{
u64 ns;
ns = wx_ptp_timecounter_cyc2time(wx, timestamp);
hwtstamp->hwtstamp = ns_to_ktime(ns);
}
/**
* wx_ptp_tx_hwtstamp - utility function which checks for TX time stamp
* @ wx : the private board 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 wx_ptp_tx_hwtstamp(struct wx *wx)
{
struct skb_shared_hwtstamps shhwtstamps;
struct sk_buff *skb = wx->ptp_tx_skb;
u64 regval = 0 ;
regval |= (u64)rd32ptp(wx, WX_TSC_1588_STMPL);
regval |= (u64)rd32ptp(wx, WX_TSC_1588_STMPH) << 32 ;
wx_ptp_convert_to_hwtstamp(wx, &shhwtstamps, regval);
wx->ptp_tx_skb = NULL;
clear_bit_unlock(WX_STATE_PTP_TX_IN_PROGRESS, wx->state);
skb_tstamp_tx(skb, &shhwtstamps);
dev_kfree_skb_any(skb);
wx->tx_hwtstamp_pkts++;
}
static int wx_ptp_tx_hwtstamp_work(struct wx *wx)
{
u32 tsynctxctl;
/* we have to have a valid skb to poll for a timestamp */
if (!wx->ptp_tx_skb) {
wx_ptp_clear_tx_timestamp(wx);
return 0 ;
}
/* stop polling once we have a valid timestamp */
tsynctxctl = rd32ptp(wx, WX_TSC_1588_CTL);
if (tsynctxctl & WX_TSC_1588_CTL_VALID) {
wx_ptp_tx_hwtstamp(wx);
return 0 ;
}
return -1 ;
}
/**
* wx_ptp_overflow_check - watchdog task to detect SYSTIME overflow
* @ wx : pointer to wx 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 .
*/
static void wx_ptp_overflow_check(struct wx *wx)
{
bool timeout = time_is_before_jiffies(wx->last_overflow_check +
WX_OVERFLOW_PERIOD);
unsigned long flags;
if (timeout) {
/* Update the timecounter */
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
timecounter_read(&wx->hw_tc);
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
wx->last_overflow_check = jiffies;
}
}
/**
* wx_ptp_rx_hang - detect error case when Rx timestamp registers latched
* @ wx : pointer to wx struct
*
* 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 .
*/
static void wx_ptp_rx_hang(struct wx *wx)
{
struct wx_ring *rx_ring;
unsigned long rx_event;
u32 tsyncrxctl;
int n;
tsyncrxctl = rd32(wx, WX_PSR_1588_CTL);
/* if we don't have a valid timestamp in the registers, just update the
* timeout counter and exit
*/
if (!(tsyncrxctl & WX_PSR_1588_CTL_VALID)) {
wx->last_rx_ptp_check = jiffies;
return ;
}
/* determine the most recent watchdog or rx_timestamp event */
rx_event = wx->last_rx_ptp_check;
for (n = 0 ; n < wx->num_rx_queues; n++) {
rx_ring = wx->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(wx, WX_PSR_1588_STMPH);
wx->last_rx_ptp_check = jiffies;
wx->rx_hwtstamp_cleared++;
dev_warn(&wx->pdev->dev, "clearing RX Timestamp hang" );
}
}
/**
* wx_ptp_tx_hang - detect error case where Tx timestamp never finishes
* @ wx : private network wx structure
*/
static void wx_ptp_tx_hang(struct wx *wx)
{
bool timeout = time_is_before_jiffies(wx->ptp_tx_start +
WX_PTP_TX_TIMEOUT);
if (!wx->ptp_tx_skb)
return ;
if (!test_bit(WX_STATE_PTP_TX_IN_PROGRESS, wx->state))
return ;
/* If we haven't received a timestamp within the timeout, it is
* reasonable to assume that it will never occur , so we can unlock the
* timestamp bit when this occurs .
*/
if (timeout) {
wx_ptp_clear_tx_timestamp(wx);
wx->tx_hwtstamp_timeouts++;
dev_warn(&wx->pdev->dev, "clearing Tx timestamp hang\n" );
}
}
static long wx_ptp_do_aux_work(struct ptp_clock_info *ptp)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
int ts_done;
ts_done = wx_ptp_tx_hwtstamp_work(wx);
wx_ptp_overflow_check(wx);
if (unlikely(test_bit(WX_FLAG_RX_HWTSTAMP_IN_REGISTER,
wx->flags)))
wx_ptp_rx_hang(wx);
wx_ptp_tx_hang(wx);
return ts_done ? 1 : HZ;
}
static u64 wx_ptp_trigger_calc(struct wx *wx)
{
struct cyclecounter *cc = &wx->hw_cc;
unsigned long flags;
u64 ns = 0 ;
u32 rem;
/* Read the current clock time, and save the cycle counter value */
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
ns = timecounter_read(&wx->hw_tc);
wx->pps_edge_start = wx->hw_tc.cycle_last;
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
wx->pps_edge_end = wx->pps_edge_start;
/* Figure out how far past the next second we are */
div_u64_rem(ns, WX_NS_PER_SEC, &rem);
/* Figure out how many nanoseconds to add to round the clock edge up
* to the next full second
*/
rem = (WX_NS_PER_SEC - rem);
/* Adjust the clock edge to align with the next full second. */
wx->pps_edge_start += div_u64(((u64)rem << cc->shift), cc->mult);
wx->pps_edge_end += div_u64(((u64)(rem + wx->pps_width) <<
cc->shift), cc->mult);
return (ns + rem);
}
static int wx_ptp_setup_sdp(struct wx *wx)
{
struct cyclecounter *cc = &wx->hw_cc;
u32 tsauxc;
u64 nsec;
if (wx->pps_width >= WX_NS_PER_SEC) {
wx_err(wx, "PTP pps width cannot be longer than 1s!\n" );
return -EINVAL;
}
/* disable the pin first */
wr32ptp(wx, WX_TSC_1588_AUX_CTL, 0 );
WX_WRITE_FLUSH(wx);
if (!test_bit(WX_FLAG_PTP_PPS_ENABLED, wx->flags)) {
if (wx->pps_enabled) {
wx->pps_enabled = false ;
wx_set_pps(wx, false , 0 , 0 );
}
return 0 ;
}
wx->pps_enabled = true ;
nsec = wx_ptp_trigger_calc(wx);
wx_set_pps(wx, wx->pps_enabled, nsec, wx->pps_edge_start);
tsauxc = WX_TSC_1588_AUX_CTL_PLSG | WX_TSC_1588_AUX_CTL_EN_TT0 |
WX_TSC_1588_AUX_CTL_EN_TT1 | WX_TSC_1588_AUX_CTL_EN_TS0;
wr32ptp(wx, WX_TSC_1588_TRGT_L(0 ), (u32)wx->pps_edge_start);
wr32ptp(wx, WX_TSC_1588_TRGT_H(0 ), (u32)(wx->pps_edge_start >> 32 ));
wr32ptp(wx, WX_TSC_1588_TRGT_L(1 ), (u32)wx->pps_edge_end);
wr32ptp(wx, WX_TSC_1588_TRGT_H(1 ), (u32)(wx->pps_edge_end >> 32 ));
wr32ptp(wx, WX_TSC_1588_SDP(0 ),
WX_TSC_1588_SDP_FUN_SEL_TT0 | WX_TSC_1588_SDP_OUT_LEVEL_H);
wr32ptp(wx, WX_TSC_1588_SDP(1 ), WX_TSC_1588_SDP_FUN_SEL_TS0);
wr32ptp(wx, WX_TSC_1588_AUX_CTL, tsauxc);
wr32ptp(wx, WX_TSC_1588_INT_EN, WX_TSC_1588_INT_EN_TT1);
WX_WRITE_FLUSH(wx);
/* Adjust the clock edge to align with the next full second. */
wx->sec_to_cc = div_u64(((u64)WX_NS_PER_SEC << cc->shift), cc->mult);
return 0 ;
}
static int wx_ptp_feature_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct wx *wx = container_of(ptp, struct wx, ptp_caps);
/**
* When PPS is enabled , unmask the interrupt for the ClockOut
* feature , so that the interrupt handler can send the PPS
* event when the clock SDP triggers . Clear mask when PPS is
* disabled
*/
if (rq->type != PTP_CLK_REQ_PEROUT || !wx->ptp_setup_sdp)
return -EOPNOTSUPP;
/* Reject requests with unsupported flags */
if (rq->perout.flags & ~(PTP_PEROUT_DUTY_CYCLE |
PTP_PEROUT_PHASE))
return -EOPNOTSUPP;
if (rq->perout.phase.sec || rq->perout.phase.nsec) {
wx_err(wx, "Absolute start time not supported.\n" );
return -EINVAL;
}
if (rq->perout.period.sec != 1 || rq->perout.period.nsec) {
wx_err(wx, "Only 1pps is supported.\n" );
return -EINVAL;
}
if (rq->perout.flags & PTP_PEROUT_DUTY_CYCLE) {
struct timespec64 ts_on;
ts_on.tv_sec = rq->perout.on.sec;
ts_on.tv_nsec = rq->perout.on.nsec;
wx->pps_width = timespec64_to_ns(&ts_on);
} else {
wx->pps_width = 120000000 ;
}
if (on)
set_bit(WX_FLAG_PTP_PPS_ENABLED, wx->flags);
else
clear_bit(WX_FLAG_PTP_PPS_ENABLED, wx->flags);
return wx->ptp_setup_sdp(wx);
}
void wx_ptp_check_pps_event(struct wx *wx)
{
u32 tsauxc, int_status;
/* 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 (!wx->ptp_clock)
return ;
int_status = rd32ptp(wx, WX_TSC_1588_INT_ST);
if (int_status & WX_TSC_1588_INT_ST_TT1) {
/* disable the pin first */
wr32ptp(wx, WX_TSC_1588_AUX_CTL, 0 );
WX_WRITE_FLUSH(wx);
wx_ptp_trigger_calc(wx);
tsauxc = WX_TSC_1588_AUX_CTL_PLSG | WX_TSC_1588_AUX_CTL_EN_TT0 |
WX_TSC_1588_AUX_CTL_EN_TT1 | WX_TSC_1588_AUX_CTL_EN_TS0;
wr32ptp(wx, WX_TSC_1588_TRGT_L(0 ), (u32)wx->pps_edge_start);
wr32ptp(wx, WX_TSC_1588_TRGT_H(0 ), (u32)(wx->pps_edge_start >> 32 ));
wr32ptp(wx, WX_TSC_1588_TRGT_L(1 ), (u32)wx->pps_edge_end);
wr32ptp(wx, WX_TSC_1588_TRGT_H(1 ), (u32)(wx->pps_edge_end >> 32 ));
wr32ptp(wx, WX_TSC_1588_AUX_CTL, tsauxc);
WX_WRITE_FLUSH(wx);
}
}
EXPORT_SYMBOL(wx_ptp_check_pps_event);
static long wx_ptp_create_clock(struct wx *wx)
{
struct net_device *netdev = wx->netdev;
long err;
/* do nothing if we already have a clock device */
if (!IS_ERR_OR_NULL(wx->ptp_clock))
return 0 ;
snprintf(wx->ptp_caps.name, sizeof (wx->ptp_caps.name),
"%s" , netdev->name);
wx->ptp_caps.owner = THIS_MODULE;
wx->ptp_caps.n_alarm = 0 ;
wx->ptp_caps.n_ext_ts = 0 ;
wx->ptp_caps.pps = 0 ;
wx->ptp_caps.adjfine = wx_ptp_adjfine;
wx->ptp_caps.adjtime = wx_ptp_adjtime;
wx->ptp_caps.gettimex64 = wx_ptp_gettimex64;
wx->ptp_caps.settime64 = wx_ptp_settime64;
wx->ptp_caps.do_aux_work = wx_ptp_do_aux_work;
switch (wx->mac.type) {
case wx_mac_aml:
case wx_mac_aml40:
wx->ptp_caps.max_adj = 250000000 ;
wx->ptp_caps.n_per_out = 1 ;
wx->ptp_setup_sdp = wx_ptp_setup_sdp;
wx->ptp_caps.enable = wx_ptp_feature_enable;
break ;
case wx_mac_sp:
wx->ptp_caps.max_adj = 250000000 ;
wx->ptp_caps.n_per_out = 0 ;
wx->ptp_setup_sdp = NULL;
break ;
case wx_mac_em:
wx->ptp_caps.max_adj = 500000000 ;
wx->ptp_caps.n_per_out = 1 ;
wx->ptp_setup_sdp = wx_ptp_setup_sdp;
wx->ptp_caps.enable = wx_ptp_feature_enable;
break ;
default :
return -EOPNOTSUPP;
}
wx->ptp_clock = ptp_clock_register(&wx->ptp_caps, &wx->pdev->dev);
if (IS_ERR(wx->ptp_clock)) {
err = PTR_ERR(wx->ptp_clock);
wx->ptp_clock = NULL;
wx_err(wx, "ptp clock register failed\n" );
return err;
} else if (wx->ptp_clock) {
dev_info(&wx->pdev->dev, "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 .
*/
wx->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
wx->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
return 0 ;
}
static int wx_ptp_set_timestamp_mode(struct wx *wx,
struct kernel_hwtstamp_config *config)
{
u32 tsync_tx_ctl = WX_TSC_1588_CTL_ENABLED;
u32 tsync_rx_ctl = WX_PSR_1588_CTL_ENABLED;
DECLARE_BITMAP(flags, WX_PF_FLAGS_NBITS);
u32 tsync_rx_mtrl = PTP_EV_PORT << 16 ;
bool is_l2 = false ;
u32 regval;
memcpy(flags, wx->flags, sizeof (wx->flags));
switch (config->tx_type) {
case HWTSTAMP_TX_OFF:
tsync_tx_ctl = 0 ;
break ;
case HWTSTAMP_TX_ON:
break ;
default :
return -ERANGE;
}
switch (config->rx_filter) {
case HWTSTAMP_FILTER_NONE:
tsync_rx_ctl = 0 ;
tsync_rx_mtrl = 0 ;
clear_bit(WX_FLAG_RX_HWTSTAMP_ENABLED, flags);
clear_bit(WX_FLAG_RX_HWTSTAMP_IN_REGISTER, flags);
break ;
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
tsync_rx_ctl |= WX_PSR_1588_CTL_TYPE_L4_V1;
tsync_rx_mtrl |= WX_PSR_1588_MSG_V1_SYNC;
set_bit(WX_FLAG_RX_HWTSTAMP_ENABLED, flags);
set_bit(WX_FLAG_RX_HWTSTAMP_IN_REGISTER, flags);
break ;
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
tsync_rx_ctl |= WX_PSR_1588_CTL_TYPE_L4_V1;
tsync_rx_mtrl |= WX_PSR_1588_MSG_V1_DELAY_REQ;
set_bit(WX_FLAG_RX_HWTSTAMP_ENABLED, flags);
set_bit(WX_FLAG_RX_HWTSTAMP_IN_REGISTER, flags);
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 |= WX_PSR_1588_CTL_TYPE_EVENT_V2;
is_l2 = true ;
config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
set_bit(WX_FLAG_RX_HWTSTAMP_ENABLED, flags);
set_bit(WX_FLAG_RX_HWTSTAMP_IN_REGISTER, flags);
break ;
default :
/* register PSR_1588_MSG 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
*/
config->rx_filter = HWTSTAMP_FILTER_NONE;
return -ERANGE;
}
/* define ethertype filter for timestamping L2 packets */
if (is_l2)
wr32(wx, WX_PSR_ETYPE_SWC(WX_PSR_ETYPE_SWC_FILTER_1588),
(WX_PSR_ETYPE_SWC_FILTER_EN | /* enable filter */
WX_PSR_ETYPE_SWC_1588 | /* enable timestamping */
ETH_P_1588)); /* 1588 eth protocol type */
else
wr32(wx, WX_PSR_ETYPE_SWC(WX_PSR_ETYPE_SWC_FILTER_1588), 0 );
/* enable/disable TX */
regval = rd32ptp(wx, WX_TSC_1588_CTL);
regval &= ~WX_TSC_1588_CTL_ENABLED;
regval |= tsync_tx_ctl;
wr32ptp(wx, WX_TSC_1588_CTL, regval);
/* enable/disable RX */
regval = rd32(wx, WX_PSR_1588_CTL);
regval &= ~(WX_PSR_1588_CTL_ENABLED | WX_PSR_1588_CTL_TYPE_MASK);
regval |= tsync_rx_ctl;
wr32(wx, WX_PSR_1588_CTL, regval);
/* define which PTP packets are time stamped */
wr32(wx, WX_PSR_1588_MSG, tsync_rx_mtrl);
WX_WRITE_FLUSH(wx);
/* configure adapter flags only when HW is actually configured */
memcpy(wx->flags, flags, sizeof (wx->flags));
/* clear TX/RX timestamp state, just to be sure */
wx_ptp_clear_tx_timestamp(wx);
rd32(wx, WX_PSR_1588_STMPH);
return 0 ;
}
static u64 wx_ptp_read(struct cyclecounter *hw_cc)
{
struct wx *wx = container_of(hw_cc, struct wx, hw_cc);
return wx_ptp_readtime(wx, NULL);
}
static void wx_ptp_link_speed_adjust(struct wx *wx, u32 *shift, u32 *incval)
{
switch (wx->mac.type) {
case wx_mac_aml:
case wx_mac_aml40:
*shift = WX_INCVAL_SHIFT_AML;
*incval = WX_INCVAL_AML;
return ;
case wx_mac_em:
*shift = WX_INCVAL_SHIFT_EM;
*incval = WX_INCVAL_EM;
return ;
default :
break ;
}
switch (wx->speed) {
case SPEED_10:
*shift = WX_INCVAL_SHIFT_10;
*incval = WX_INCVAL_10;
break ;
case SPEED_100:
*shift = WX_INCVAL_SHIFT_100;
*incval = WX_INCVAL_100;
break ;
case SPEED_1000:
*shift = WX_INCVAL_SHIFT_1GB;
*incval = WX_INCVAL_1GB;
break ;
case SPEED_10000:
default :
*shift = WX_INCVAL_SHIFT_10GB;
*incval = WX_INCVAL_10GB;
break ;
}
}
/**
* wx_ptp_reset_cyclecounter - create the cycle counter from hw
* @ wx : pointer to the wx structure
*
* This function should be called to set the proper values for the TSC_1588_INC
* 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 TSC_1588_INC value is
* necessary , such as during initialization or when the link speed changes .
*/
void wx_ptp_reset_cyclecounter(struct wx *wx)
{
u32 incval = 0 , mask = 0 ;
struct cyclecounter cc;
unsigned long flags;
/* For some of the boards below this mask is technically incorrect.
* The timestamp mask overflows at approximately 61 bits . However the
* particular hardware does not overflow on an even bitmask value .
* Instead , it overflows due to conversion of upper 32 bits 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 = wx_ptp_read;
wx_ptp_link_speed_adjust(wx, &cc.shift, &incval);
/* update the base incval used to calculate frequency adjustment */
WRITE_ONCE(wx->base_incval, incval);
mask = (wx->mac.type == wx_mac_em) ? 0 x7FFFFFF : 0 xFFFFFF;
incval &= mask;
if (wx->mac.type != wx_mac_em)
incval |= 2 << 24 ;
wr32ptp(wx, WX_TSC_1588_INC, incval);
smp_mb(); /* Force the above update. */
/* need lock to prevent incorrect read while modifying cyclecounter */
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
memcpy(&wx->hw_cc, &cc, sizeof (wx->hw_cc));
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
}
EXPORT_SYMBOL(wx_ptp_reset_cyclecounter);
void wx_ptp_reset(struct wx *wx)
{
unsigned long flags;
/* reset the hardware timestamping mode */
wx_ptp_set_timestamp_mode(wx, &wx->tstamp_config);
wx_ptp_reset_cyclecounter(wx);
wr32ptp(wx, WX_TSC_1588_SYSTIML, 0 );
wr32ptp(wx, WX_TSC_1588_SYSTIMH, 0 );
WX_WRITE_FLUSH(wx);
write_seqlock_irqsave(&wx->hw_tc_lock, flags);
timecounter_init(&wx->hw_tc, &wx->hw_cc,
ktime_to_ns(ktime_get_real()));
write_sequnlock_irqrestore(&wx->hw_tc_lock, flags);
wx->last_overflow_check = jiffies;
ptp_schedule_worker(wx->ptp_clock, HZ);
/* Now that the shift has been calculated and the systime
* registers reset , ( re - ) enable the Clock out feature
*/
if (wx->ptp_setup_sdp)
wx->ptp_setup_sdp(wx);
}
EXPORT_SYMBOL(wx_ptp_reset);
void wx_ptp_init(struct wx *wx)
{
/* Initialize the seqlock_t first, since the user might call the clock
* functions any time after we ' ve initialized the ptp clock device .
*/
seqlock_init(&wx->hw_tc_lock);
/* obtain a ptp clock device, or re-use an existing device */
if (wx_ptp_create_clock(wx))
return ;
wx->tx_hwtstamp_pkts = 0 ;
wx->tx_hwtstamp_timeouts = 0 ;
wx->tx_hwtstamp_skipped = 0 ;
wx->tx_hwtstamp_errors = 0 ;
wx->rx_hwtstamp_cleared = 0 ;
/* reset the ptp related hardware bits */
wx_ptp_reset(wx);
/* enter the WX_STATE_PTP_RUNNING state */
set_bit(WX_STATE_PTP_RUNNING, wx->state);
}
EXPORT_SYMBOL(wx_ptp_init);
/**
* wx_ptp_suspend - stop ptp work items
* @ wx : pointer to wx struct
*
* This function suspends ptp activity , and prevents more work from being
* generated , but does not destroy the clock device .
*/
void wx_ptp_suspend(struct wx *wx)
{
/* leave the WX_STATE_PTP_RUNNING STATE */
if (!test_and_clear_bit(WX_STATE_PTP_RUNNING, wx->state))
return ;
clear_bit(WX_FLAG_PTP_PPS_ENABLED, wx->flags);
if (wx->ptp_setup_sdp)
wx->ptp_setup_sdp(wx);
wx_ptp_clear_tx_timestamp(wx);
}
EXPORT_SYMBOL(wx_ptp_suspend);
/**
* wx_ptp_stop - destroy the ptp_clock device
* @ wx : pointer to wx struct
*
* Completely destroy the ptp_clock device , and disable all PTP related
* features . Intended to be run when the device is being closed .
*/
void wx_ptp_stop(struct wx *wx)
{
/* first, suspend ptp activity */
wx_ptp_suspend(wx);
/* now destroy the ptp clock device */
if (wx->ptp_clock) {
ptp_clock_unregister(wx->ptp_clock);
wx->ptp_clock = NULL;
dev_info(&wx->pdev->dev, "removed PHC on %s\n" , wx->netdev->name);
}
}
EXPORT_SYMBOL(wx_ptp_stop);
/**
* wx_ptp_rx_hwtstamp - utility function which checks for RX time stamp
* @ wx : pointer to wx struct
* @ 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 wx_ptp_rx_hwtstamp(struct wx *wx, struct sk_buff *skb)
{
u64 regval = 0 ;
u32 tsyncrxctl;
/* Read the tsyncrxctl register afterwards in order to prevent taking an
* I / O hit on every packet .
*/
tsyncrxctl = rd32(wx, WX_PSR_1588_CTL);
if (!(tsyncrxctl & WX_PSR_1588_CTL_VALID))
return ;
regval |= (u64)rd32(wx, WX_PSR_1588_STMPL);
regval |= (u64)rd32(wx, WX_PSR_1588_STMPH) << 32 ;
wx_ptp_convert_to_hwtstamp(wx, skb_hwtstamps(skb), regval);
}
int wx_hwtstamp_get(struct net_device *dev,
struct kernel_hwtstamp_config *cfg)
{
struct wx *wx = netdev_priv(dev);
if (!netif_running(dev))
return -EINVAL;
*cfg = wx->tstamp_config;
return 0 ;
}
EXPORT_SYMBOL(wx_hwtstamp_get);
int wx_hwtstamp_set(struct net_device *dev,
struct kernel_hwtstamp_config *cfg,
struct netlink_ext_ack *extack)
{
struct wx *wx = netdev_priv(dev);
int err;
if (!netif_running(dev))
return -EINVAL;
err = wx_ptp_set_timestamp_mode(wx, cfg);
if (err)
return err;
/* save these settings for future reference */
memcpy(&wx->tstamp_config, cfg, sizeof (wx->tstamp_config));
return 0 ;
}
EXPORT_SYMBOL(wx_hwtstamp_set);
Messung V0.5 in Prozent C=92 H=100 G=95
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-10-11)
¤
*© Formatika GbR, Deutschland
2026-10-11
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