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linux-zen-server/drivers/net/ethernet/intel/i40e/i40e_ptp.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */
#include "i40e.h"
#include <linux/ptp_classify.h>
#include <linux/posix-clock.h>
/* The XL710 timesync is very much like Intel's 82599 design when it comes to
* the fundamental clock design. However, the clock operations are much simpler
* in the XL710 because the device supports a full 64 bits of nanoseconds.
* Because the field is so wide, we can forgo the cycle counter and just
* operate with the nanosecond field directly without fear of overflow.
*
* Much like the 82599, the update period is dependent upon the link speed:
* At 40Gb, 25Gb, or no link, the period is 1.6ns.
* At 10Gb or 5Gb link, the period is multiplied by 2. (3.2ns)
* At 1Gb link, the period is multiplied by 20. (32ns)
* 1588 functionality is not supported at 100Mbps.
*/
#define I40E_PTP_40GB_INCVAL 0x0199999999ULL
#define I40E_PTP_10GB_INCVAL_MULT 2
#define I40E_PTP_5GB_INCVAL_MULT 2
#define I40E_PTP_1GB_INCVAL_MULT 20
#define I40E_ISGN 0x80000000
#define I40E_PRTTSYN_CTL1_TSYNTYPE_V1 BIT(I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
#define I40E_PRTTSYN_CTL1_TSYNTYPE_V2 (2 << \
I40E_PRTTSYN_CTL1_TSYNTYPE_SHIFT)
#define I40E_SUBDEV_ID_25G_PTP_PIN 0xB
enum i40e_ptp_pin {
SDP3_2 = 0,
SDP3_3,
GPIO_4
};
enum i40e_can_set_pins_t {
CANT_DO_PINS = -1,
CAN_SET_PINS,
CAN_DO_PINS
};
static struct ptp_pin_desc sdp_desc[] = {
/* name idx func chan */
{"SDP3_2", SDP3_2, PTP_PF_NONE, 0},
{"SDP3_3", SDP3_3, PTP_PF_NONE, 1},
{"GPIO_4", GPIO_4, PTP_PF_NONE, 1},
};
enum i40e_ptp_gpio_pin_state {
end = -2,
invalid,
off,
in_A,
in_B,
out_A,
out_B,
};
static const char * const i40e_ptp_gpio_pin_state2str[] = {
"off", "in_A", "in_B", "out_A", "out_B"
};
enum i40e_ptp_led_pin_state {
led_end = -2,
low = 0,
high,
};
struct i40e_ptp_pins_settings {
enum i40e_ptp_gpio_pin_state sdp3_2;
enum i40e_ptp_gpio_pin_state sdp3_3;
enum i40e_ptp_gpio_pin_state gpio_4;
enum i40e_ptp_led_pin_state led2_0;
enum i40e_ptp_led_pin_state led2_1;
enum i40e_ptp_led_pin_state led3_0;
enum i40e_ptp_led_pin_state led3_1;
};
static const struct i40e_ptp_pins_settings
i40e_ptp_pin_led_allowed_states[] = {
{off, off, off, high, high, high, high},
{off, in_A, off, high, high, high, low},
{off, out_A, off, high, low, high, high},
{off, in_B, off, high, high, high, low},
{off, out_B, off, high, low, high, high},
{in_A, off, off, high, high, high, low},
{in_A, in_B, off, high, high, high, low},
{in_A, out_B, off, high, low, high, high},
{out_A, off, off, high, low, high, high},
{out_A, in_B, off, high, low, high, high},
{in_B, off, off, high, high, high, low},
{in_B, in_A, off, high, high, high, low},
{in_B, out_A, off, high, low, high, high},
{out_B, off, off, high, low, high, high},
{out_B, in_A, off, high, low, high, high},
{off, off, in_A, high, high, low, high},
{off, out_A, in_A, high, low, low, high},
{off, in_B, in_A, high, high, low, low},
{off, out_B, in_A, high, low, low, high},
{out_A, off, in_A, high, low, low, high},
{out_A, in_B, in_A, high, low, low, high},
{in_B, off, in_A, high, high, low, low},
{in_B, out_A, in_A, high, low, low, high},
{out_B, off, in_A, high, low, low, high},
{off, off, out_A, low, high, high, high},
{off, in_A, out_A, low, high, high, low},
{off, in_B, out_A, low, high, high, low},
{off, out_B, out_A, low, low, high, high},
{in_A, off, out_A, low, high, high, low},
{in_A, in_B, out_A, low, high, high, low},
{in_A, out_B, out_A, low, low, high, high},
{in_B, off, out_A, low, high, high, low},
{in_B, in_A, out_A, low, high, high, low},
{out_B, off, out_A, low, low, high, high},
{out_B, in_A, out_A, low, low, high, high},
{off, off, in_B, high, high, low, high},
{off, in_A, in_B, high, high, low, low},
{off, out_A, in_B, high, low, low, high},
{off, out_B, in_B, high, low, low, high},
{in_A, off, in_B, high, high, low, low},
{in_A, out_B, in_B, high, low, low, high},
{out_A, off, in_B, high, low, low, high},
{out_B, off, in_B, high, low, low, high},
{out_B, in_A, in_B, high, low, low, high},
{off, off, out_B, low, high, high, high},
{off, in_A, out_B, low, high, high, low},
{off, out_A, out_B, low, low, high, high},
{off, in_B, out_B, low, high, high, low},
{in_A, off, out_B, low, high, high, low},
{in_A, in_B, out_B, low, high, high, low},
{out_A, off, out_B, low, low, high, high},
{out_A, in_B, out_B, low, low, high, high},
{in_B, off, out_B, low, high, high, low},
{in_B, in_A, out_B, low, high, high, low},
{in_B, out_A, out_B, low, low, high, high},
{end, end, end, led_end, led_end, led_end, led_end}
};
static int i40e_ptp_set_pins(struct i40e_pf *pf,
struct i40e_ptp_pins_settings *pins);
/**
* i40e_ptp_extts0_work - workqueue task function
* @work: workqueue task structure
*
* Service for PTP external clock event
**/
static void i40e_ptp_extts0_work(struct work_struct *work)
{
struct i40e_pf *pf = container_of(work, struct i40e_pf,
ptp_extts0_work);
struct i40e_hw *hw = &pf->hw;
struct ptp_clock_event event;
u32 hi, lo;
/* Event time is captured by one of the two matched registers
* PRTTSYN_EVNT_L: 32 LSB of sampled time event
* PRTTSYN_EVNT_H: 32 MSB of sampled time event
* Event is defined in PRTTSYN_EVNT_0 register
*/
lo = rd32(hw, I40E_PRTTSYN_EVNT_L(0));
hi = rd32(hw, I40E_PRTTSYN_EVNT_H(0));
event.timestamp = (((u64)hi) << 32) | lo;
event.type = PTP_CLOCK_EXTTS;
event.index = hw->pf_id;
/* fire event */
ptp_clock_event(pf->ptp_clock, &event);
}
/**
* i40e_is_ptp_pin_dev - check if device supports PTP pins
* @hw: pointer to the hardware structure
*
* Return true if device supports PTP pins, false otherwise.
**/
static bool i40e_is_ptp_pin_dev(struct i40e_hw *hw)
{
return hw->device_id == I40E_DEV_ID_25G_SFP28 &&
hw->subsystem_device_id == I40E_SUBDEV_ID_25G_PTP_PIN;
}
/**
* i40e_can_set_pins - check possibility of manipulating the pins
* @pf: board private structure
*
* Check if all conditions are satisfied to manipulate PTP pins.
* Return CAN_SET_PINS if pins can be set on a specific PF or
* return CAN_DO_PINS if pins can be manipulated within a NIC or
* return CANT_DO_PINS otherwise.
**/
static enum i40e_can_set_pins_t i40e_can_set_pins(struct i40e_pf *pf)
{
if (!i40e_is_ptp_pin_dev(&pf->hw)) {
dev_warn(&pf->pdev->dev,
"PTP external clock not supported.\n");
return CANT_DO_PINS;
}
if (!pf->ptp_pins) {
dev_warn(&pf->pdev->dev,
"PTP PIN manipulation not allowed.\n");
return CANT_DO_PINS;
}
if (pf->hw.pf_id) {
dev_warn(&pf->pdev->dev,
"PTP PINs should be accessed via PF0.\n");
return CAN_DO_PINS;
}
return CAN_SET_PINS;
}
/**
* i40_ptp_reset_timing_events - Reset PTP timing events
* @pf: Board private structure
*
* This function resets timing events for pf.
**/
static void i40_ptp_reset_timing_events(struct i40e_pf *pf)
{
u32 i;
spin_lock_bh(&pf->ptp_rx_lock);
for (i = 0; i <= I40E_PRTTSYN_RXTIME_L_MAX_INDEX; i++) {
/* reading and automatically clearing timing events registers */
rd32(&pf->hw, I40E_PRTTSYN_RXTIME_L(i));
rd32(&pf->hw, I40E_PRTTSYN_RXTIME_H(i));
pf->latch_events[i] = 0;
}
/* reading and automatically clearing timing events registers */
rd32(&pf->hw, I40E_PRTTSYN_TXTIME_L);
rd32(&pf->hw, I40E_PRTTSYN_TXTIME_H);
pf->tx_hwtstamp_timeouts = 0;
pf->tx_hwtstamp_skipped = 0;
pf->rx_hwtstamp_cleared = 0;
pf->latch_event_flags = 0;
spin_unlock_bh(&pf->ptp_rx_lock);
}
/**
* i40e_ptp_verify - check pins
* @ptp: ptp clock
* @pin: pin index
* @func: assigned function
* @chan: channel
*
* Check pins consistency.
* Return 0 on success or error on failure.
**/
static int i40e_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
enum ptp_pin_function func, unsigned int chan)
{
switch (func) {
case PTP_PF_NONE:
case PTP_PF_EXTTS:
case PTP_PF_PEROUT:
break;
case PTP_PF_PHYSYNC:
return -EOPNOTSUPP;
}
return 0;
}
/**
* i40e_ptp_read - Read the PHC time from the device
* @pf: Board private structure
* @ts: timespec structure to hold the current time value
* @sts: structure to hold the system time before and after reading the PHC
*
* This function reads the PRTTSYN_TIME registers and stores them in a
* timespec. However, since the registers are 64 bits of nanoseconds, we must
* convert the result to a timespec before we can return.
**/
static void i40e_ptp_read(struct i40e_pf *pf, struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct i40e_hw *hw = &pf->hw;
u32 hi, lo;
u64 ns;
/* The timer latches on the lowest register read. */
ptp_read_system_prets(sts);
lo = rd32(hw, I40E_PRTTSYN_TIME_L);
ptp_read_system_postts(sts);
hi = rd32(hw, I40E_PRTTSYN_TIME_H);
ns = (((u64)hi) << 32) | lo;
*ts = ns_to_timespec64(ns);
}
/**
* i40e_ptp_write - Write the PHC time to the device
* @pf: Board private structure
* @ts: timespec structure that holds the new time value
*
* This function writes the PRTTSYN_TIME registers with the user value. Since
* we receive a timespec from the stack, we must convert that timespec into
* nanoseconds before programming the registers.
**/
static void i40e_ptp_write(struct i40e_pf *pf, const struct timespec64 *ts)
{
struct i40e_hw *hw = &pf->hw;
u64 ns = timespec64_to_ns(ts);
/* The timer will not update until the high register is written, so
* write the low register first.
*/
wr32(hw, I40E_PRTTSYN_TIME_L, ns & 0xFFFFFFFF);
wr32(hw, I40E_PRTTSYN_TIME_H, ns >> 32);
}
/**
* i40e_ptp_convert_to_hwtstamp - Convert device clock to system time
* @hwtstamps: Timestamp structure to update
* @timestamp: Timestamp from the hardware
*
* We need to convert the NIC clock value into a hwtstamp which can be used by
* the upper level timestamping functions. Since the timestamp is simply a 64-
* bit nanosecond value, we can call ns_to_ktime directly to handle this.
**/
static void i40e_ptp_convert_to_hwtstamp(struct skb_shared_hwtstamps *hwtstamps,
u64 timestamp)
{
memset(hwtstamps, 0, sizeof(*hwtstamps));
hwtstamps->hwtstamp = ns_to_ktime(timestamp);
}
/**
* i40e_ptp_adjfine - Adjust the PHC frequency
* @ptp: The PTP clock structure
* @scaled_ppm: Scaled parts per million adjustment from base
*
* Adjust the frequency of the PHC by the indicated delta from the base
* frequency.
*
* Scaled parts per million is ppm with a 16 bit binary fractional field.
**/
static int i40e_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
struct i40e_hw *hw = &pf->hw;
u64 adj, base_adj;
smp_mb(); /* Force any pending update before accessing. */
base_adj = I40E_PTP_40GB_INCVAL * READ_ONCE(pf->ptp_adj_mult);
adj = adjust_by_scaled_ppm(base_adj, scaled_ppm);
wr32(hw, I40E_PRTTSYN_INC_L, adj & 0xFFFFFFFF);
wr32(hw, I40E_PRTTSYN_INC_H, adj >> 32);
return 0;
}
/**
* i40e_ptp_set_1pps_signal_hw - configure 1PPS PTP signal for pins
* @pf: the PF private data structure
*
* Configure 1PPS signal used for PTP pins
**/
static void i40e_ptp_set_1pps_signal_hw(struct i40e_pf *pf)
{
struct i40e_hw *hw = &pf->hw;
struct timespec64 now;
u64 ns;
wr32(hw, I40E_PRTTSYN_AUX_0(1), 0);
wr32(hw, I40E_PRTTSYN_AUX_1(1), I40E_PRTTSYN_AUX_1_INSTNT);
wr32(hw, I40E_PRTTSYN_AUX_0(1), I40E_PRTTSYN_AUX_0_OUT_ENABLE);
i40e_ptp_read(pf, &now, NULL);
now.tv_sec += I40E_PTP_2_SEC_DELAY;
now.tv_nsec = 0;
ns = timespec64_to_ns(&now);
/* I40E_PRTTSYN_TGT_L(1) */
wr32(hw, I40E_PRTTSYN_TGT_L(1), ns & 0xFFFFFFFF);
/* I40E_PRTTSYN_TGT_H(1) */
wr32(hw, I40E_PRTTSYN_TGT_H(1), ns >> 32);
wr32(hw, I40E_PRTTSYN_CLKO(1), I40E_PTP_HALF_SECOND);
wr32(hw, I40E_PRTTSYN_AUX_1(1), I40E_PRTTSYN_AUX_1_INSTNT);
wr32(hw, I40E_PRTTSYN_AUX_0(1),
I40E_PRTTSYN_AUX_0_OUT_ENABLE_CLK_MOD);
}
/**
* i40e_ptp_adjtime - Adjust the PHC time
* @ptp: The PTP clock structure
* @delta: Offset in nanoseconds to adjust the PHC time by
*
* Adjust the current clock time by a delta specified in nanoseconds.
**/
static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
struct i40e_hw *hw = &pf->hw;
mutex_lock(&pf->tmreg_lock);
if (delta > -999999900LL && delta < 999999900LL) {
int neg_adj = 0;
u32 timadj;
u64 tohw;
if (delta < 0) {
neg_adj = 1;
tohw = -delta;
} else {
tohw = delta;
}
timadj = tohw & 0x3FFFFFFF;
if (neg_adj)
timadj |= I40E_ISGN;
wr32(hw, I40E_PRTTSYN_ADJ, timadj);
} else {
struct timespec64 then, now;
then = ns_to_timespec64(delta);
i40e_ptp_read(pf, &now, NULL);
now = timespec64_add(now, then);
i40e_ptp_write(pf, (const struct timespec64 *)&now);
i40e_ptp_set_1pps_signal_hw(pf);
}
mutex_unlock(&pf->tmreg_lock);
return 0;
}
/**
* i40e_ptp_gettimex - Get the time of the PHC
* @ptp: The PTP clock structure
* @ts: timespec structure to hold the current time value
* @sts: structure to hold the system time before and after reading the PHC
*
* Read the device clock and return the correct value on ns, after converting it
* into a timespec struct.
**/
static int i40e_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
mutex_lock(&pf->tmreg_lock);
i40e_ptp_read(pf, ts, sts);
mutex_unlock(&pf->tmreg_lock);
return 0;
}
/**
* i40e_ptp_settime - Set the time of the PHC
* @ptp: The PTP clock structure
* @ts: timespec64 structure that holds the new time value
*
* Set the device clock to the user input value. The conversion from timespec
* to ns happens in the write function.
**/
static int i40e_ptp_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
mutex_lock(&pf->tmreg_lock);
i40e_ptp_write(pf, ts);
mutex_unlock(&pf->tmreg_lock);
return 0;
}
/**
* i40e_pps_configure - configure PPS events
* @ptp: ptp clock
* @rq: clock request
* @on: status
*
* Configure PPS events for external clock source.
* Return 0 on success or error on failure.
**/
static int i40e_pps_configure(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq,
int on)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
if (!!on)
i40e_ptp_set_1pps_signal_hw(pf);
return 0;
}
/**
* i40e_pin_state - determine PIN state
* @index: PIN index
* @func: function assigned to PIN
*
* Determine PIN state based on PIN index and function assigned.
* Return PIN state.
**/
static enum i40e_ptp_gpio_pin_state i40e_pin_state(int index, int func)
{
enum i40e_ptp_gpio_pin_state state = off;
if (index == 0 && func == PTP_PF_EXTTS)
state = in_A;
if (index == 1 && func == PTP_PF_EXTTS)
state = in_B;
if (index == 0 && func == PTP_PF_PEROUT)
state = out_A;
if (index == 1 && func == PTP_PF_PEROUT)
state = out_B;
return state;
}
/**
* i40e_ptp_enable_pin - enable PINs.
* @pf: private board structure
* @chan: channel
* @func: PIN function
* @on: state
*
* Enable PTP pins for external clock source.
* Return 0 on success or error code on failure.
**/
static int i40e_ptp_enable_pin(struct i40e_pf *pf, unsigned int chan,
enum ptp_pin_function func, int on)
{
enum i40e_ptp_gpio_pin_state *pin = NULL;
struct i40e_ptp_pins_settings pins;
int pin_index;
/* Use PF0 to set pins. Return success for user space tools */
if (pf->hw.pf_id)
return 0;
/* Preserve previous state of pins that we don't touch */
pins.sdp3_2 = pf->ptp_pins->sdp3_2;
pins.sdp3_3 = pf->ptp_pins->sdp3_3;
pins.gpio_4 = pf->ptp_pins->gpio_4;
/* To turn on the pin - find the corresponding one based on
* the given index. To to turn the function off - find
* which pin had it assigned. Don't use ptp_find_pin here
* because it tries to lock the pincfg_mux which is locked by
* ptp_pin_store() that calls here.
*/
if (on) {
pin_index = ptp_find_pin(pf->ptp_clock, func, chan);
if (pin_index < 0)
return -EBUSY;
switch (pin_index) {
case SDP3_2:
pin = &pins.sdp3_2;
break;
case SDP3_3:
pin = &pins.sdp3_3;
break;
case GPIO_4:
pin = &pins.gpio_4;
break;
default:
return -EINVAL;
}
*pin = i40e_pin_state(chan, func);
} else {
pins.sdp3_2 = off;
pins.sdp3_3 = off;
pins.gpio_4 = off;
}
return i40e_ptp_set_pins(pf, &pins) ? -EINVAL : 0;
}
/**
* i40e_ptp_feature_enable - Enable external clock pins
* @ptp: The PTP clock structure
* @rq: The PTP clock request structure
* @on: To turn feature on/off
*
* Setting on/off PTP PPS feature for pin.
**/
static int i40e_ptp_feature_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq,
int on)
{
struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
enum ptp_pin_function func;
unsigned int chan;
/* TODO: Implement flags handling for EXTTS and PEROUT */
switch (rq->type) {
case PTP_CLK_REQ_EXTTS:
func = PTP_PF_EXTTS;
chan = rq->extts.index;
break;
case PTP_CLK_REQ_PEROUT:
func = PTP_PF_PEROUT;
chan = rq->perout.index;
break;
case PTP_CLK_REQ_PPS:
return i40e_pps_configure(ptp, rq, on);
default:
return -EOPNOTSUPP;
}
return i40e_ptp_enable_pin(pf, chan, func, on);
}
/**
* i40e_ptp_get_rx_events - Read I40E_PRTTSYN_STAT_1 and latch events
* @pf: the PF data structure
*
* This function reads I40E_PRTTSYN_STAT_1 and updates the corresponding timers
* for noticed latch events. This allows the driver to keep track of the first
* time a latch event was noticed which will be used to help clear out Rx
* timestamps for packets that got dropped or lost.
*
* This function will return the current value of I40E_PRTTSYN_STAT_1 and is
* expected to be called only while under the ptp_rx_lock.
**/
static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf)
{
struct i40e_hw *hw = &pf->hw;
u32 prttsyn_stat, new_latch_events;
int i;
prttsyn_stat = rd32(hw, I40E_PRTTSYN_STAT_1);
new_latch_events = prttsyn_stat & ~pf->latch_event_flags;
/* Update the jiffies time for any newly latched timestamp. This
* ensures that we store the time that we first discovered a timestamp
* was latched by the hardware. The service task will later determine
* if we should free the latch and drop that timestamp should too much
* time pass. This flow ensures that we only update jiffies for new
* events latched since the last time we checked, and not all events
* currently latched, so that the service task accounting remains
* accurate.
*/
for (i = 0; i < 4; i++) {
if (new_latch_events & BIT(i))
pf->latch_events[i] = jiffies;
}
/* Finally, we store the current status of the Rx timestamp latches */
pf->latch_event_flags = prttsyn_stat;
return prttsyn_stat;
}
/**
* i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
* @pf: The PF private data 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 i40e_ptp_rx_hang(struct i40e_pf *pf)
{
struct i40e_hw *hw = &pf->hw;
unsigned int i, cleared = 0;
/* Since we cannot turn off the Rx timestamp logic if the device is
* configured for Tx timestamping, we check if Rx timestamping is
* configured. We don't want to spuriously warn about Rx timestamp
* hangs if we don't care about the timestamps.
*/
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
return;
spin_lock_bh(&pf->ptp_rx_lock);
/* Update current latch times for Rx events */
i40e_ptp_get_rx_events(pf);
/* Check all the currently latched Rx events and see whether they have
* been latched for over a second. It is assumed that any timestamp
* should have been cleared within this time, or else it was captured
* for a dropped frame that the driver never received. Thus, we will
* clear any timestamp that has been latched for over 1 second.
*/
for (i = 0; i < 4; i++) {
if ((pf->latch_event_flags & BIT(i)) &&
time_is_before_jiffies(pf->latch_events[i] + HZ)) {
rd32(hw, I40E_PRTTSYN_RXTIME_H(i));
pf->latch_event_flags &= ~BIT(i);
cleared++;
}
}
spin_unlock_bh(&pf->ptp_rx_lock);
/* Log a warning if more than 2 timestamps got dropped in the same
* check. We don't want to warn about all drops because it can occur
* in normal scenarios such as PTP frames on multicast addresses we
* aren't listening to. However, administrator should know if this is
* the reason packets aren't receiving timestamps.
*/
if (cleared > 2)
dev_dbg(&pf->pdev->dev,
"Dropped %d missed RXTIME timestamp events\n",
cleared);
/* Finally, update the rx_hwtstamp_cleared counter */
pf->rx_hwtstamp_cleared += cleared;
}
/**
* i40e_ptp_tx_hang - Detect error case when Tx timestamp register is hung
* @pf: The PF private data structure
*
* This watchdog task is run periodically to make sure that we clear the Tx
* timestamp logic if we don't obtain a timestamp in a reasonable amount of
* time. It is unexpected in the normal case but if it occurs it results in
* permanently preventing timestamps of future packets.
**/
void i40e_ptp_tx_hang(struct i40e_pf *pf)
{
struct sk_buff *skb;
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
return;
/* Nothing to do if we're not already waiting for a timestamp */
if (!test_bit(__I40E_PTP_TX_IN_PROGRESS, pf->state))
return;
/* We already have a handler routine which is run when we are notified
* of a Tx timestamp in the hardware. If we don't get an interrupt
* within a second it is reasonable to assume that we never will.
*/
if (time_is_before_jiffies(pf->ptp_tx_start + HZ)) {
skb = pf->ptp_tx_skb;
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
/* Free the skb after we clear the bitlock */
dev_kfree_skb_any(skb);
pf->tx_hwtstamp_timeouts++;
}
}
/**
* i40e_ptp_tx_hwtstamp - Utility function which returns the Tx timestamp
* @pf: Board private structure
*
* Read the value of the Tx timestamp from the registers, convert it into a
* value consumable by the stack, and store that result into the shhwtstamps
* struct before returning it up the stack.
**/
void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf)
{
struct skb_shared_hwtstamps shhwtstamps;
struct sk_buff *skb = pf->ptp_tx_skb;
struct i40e_hw *hw = &pf->hw;
u32 hi, lo;
u64 ns;
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_tx)
return;
/* don't attempt to timestamp if we don't have an skb */
if (!pf->ptp_tx_skb)
return;
lo = rd32(hw, I40E_PRTTSYN_TXTIME_L);
hi = rd32(hw, I40E_PRTTSYN_TXTIME_H);
ns = (((u64)hi) << 32) | lo;
i40e_ptp_convert_to_hwtstamp(&shhwtstamps, ns);
/* Clear the bit lock as soon as possible after reading the register,
* and prior to notifying the stack via skb_tstamp_tx(). Otherwise
* applications might wake up and attempt to request another transmit
* timestamp prior to the bit lock being cleared.
*/
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
/* Notify the stack and free the skb after we've unlocked */
skb_tstamp_tx(skb, &shhwtstamps);
dev_kfree_skb_any(skb);
}
/**
* i40e_ptp_rx_hwtstamp - Utility function which checks for an Rx timestamp
* @pf: Board private structure
* @skb: Particular skb to send timestamp with
* @index: Index into the receive timestamp registers for the timestamp
*
* The XL710 receives a notification in the receive descriptor with an offset
* into the set of RXTIME registers where the timestamp is for that skb. This
* function goes and fetches the receive timestamp from that offset, if a valid
* one exists. The RXTIME registers are in ns, so we must convert the result
* first.
**/
void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index)
{
u32 prttsyn_stat, hi, lo;
struct i40e_hw *hw;
u64 ns;
/* Since we cannot turn off the Rx timestamp logic if the device is
* doing Tx timestamping, check if Rx timestamping is configured.
*/
if (!(pf->flags & I40E_FLAG_PTP) || !pf->ptp_rx)
return;
hw = &pf->hw;
spin_lock_bh(&pf->ptp_rx_lock);
/* Get current Rx events and update latch times */
prttsyn_stat = i40e_ptp_get_rx_events(pf);
/* TODO: Should we warn about missing Rx timestamp event? */
if (!(prttsyn_stat & BIT(index))) {
spin_unlock_bh(&pf->ptp_rx_lock);
return;
}
/* Clear the latched event since we're about to read its register */
pf->latch_event_flags &= ~BIT(index);
lo = rd32(hw, I40E_PRTTSYN_RXTIME_L(index));
hi = rd32(hw, I40E_PRTTSYN_RXTIME_H(index));
spin_unlock_bh(&pf->ptp_rx_lock);
ns = (((u64)hi) << 32) | lo;
i40e_ptp_convert_to_hwtstamp(skb_hwtstamps(skb), ns);
}
/**
* i40e_ptp_set_increment - Utility function to update clock increment rate
* @pf: Board private structure
*
* During a link change, the DMA frequency that drives the 1588 logic will
* change. In order to keep the PRTTSYN_TIME registers in units of nanoseconds,
* we must update the increment value per clock tick.
**/
void i40e_ptp_set_increment(struct i40e_pf *pf)
{
struct i40e_link_status *hw_link_info;
struct i40e_hw *hw = &pf->hw;
u64 incval;
u32 mult;
hw_link_info = &hw->phy.link_info;
i40e_aq_get_link_info(&pf->hw, true, NULL, NULL);
switch (hw_link_info->link_speed) {
case I40E_LINK_SPEED_10GB:
mult = I40E_PTP_10GB_INCVAL_MULT;
break;
case I40E_LINK_SPEED_5GB:
mult = I40E_PTP_5GB_INCVAL_MULT;
break;
case I40E_LINK_SPEED_1GB:
mult = I40E_PTP_1GB_INCVAL_MULT;
break;
case I40E_LINK_SPEED_100MB:
{
static int warn_once;
if (!warn_once) {
dev_warn(&pf->pdev->dev,
"1588 functionality is not supported at 100 Mbps. Stopping the PHC.\n");
warn_once++;
}
mult = 0;
break;
}
case I40E_LINK_SPEED_40GB:
default:
mult = 1;
break;
}
/* The increment value is calculated by taking the base 40GbE incvalue
* and multiplying it by a factor based on the link speed.
*/
incval = I40E_PTP_40GB_INCVAL * mult;
/* Write the new increment value into the increment register. The
* hardware will not update the clock until both registers have been
* written.
*/
wr32(hw, I40E_PRTTSYN_INC_L, incval & 0xFFFFFFFF);
wr32(hw, I40E_PRTTSYN_INC_H, incval >> 32);
/* Update the base adjustement value. */
WRITE_ONCE(pf->ptp_adj_mult, mult);
smp_mb(); /* Force the above update. */
}
/**
* i40e_ptp_get_ts_config - ioctl interface to read the HW timestamping
* @pf: Board private structure
* @ifr: ioctl data
*
* Obtain the current hardware timestamping settigs as requested. To do this,
* keep a shadow copy of the timestamp settings rather than attempting to
* deconstruct it from the registers.
**/
int i40e_ptp_get_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
{
struct hwtstamp_config *config = &pf->tstamp_config;
if (!(pf->flags & I40E_FLAG_PTP))
return -EOPNOTSUPP;
return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
-EFAULT : 0;
}
/**
* i40e_ptp_free_pins - free memory used by PTP pins
* @pf: Board private structure
*
* Release memory allocated for PTP pins.
**/
static void i40e_ptp_free_pins(struct i40e_pf *pf)
{
if (i40e_is_ptp_pin_dev(&pf->hw)) {
kfree(pf->ptp_pins);
kfree(pf->ptp_caps.pin_config);
pf->ptp_pins = NULL;
}
}
/**
* i40e_ptp_set_pin_hw - Set HW GPIO pin
* @hw: pointer to the hardware structure
* @pin: pin index
* @state: pin state
*
* Set status of GPIO pin for external clock handling.
**/
static void i40e_ptp_set_pin_hw(struct i40e_hw *hw,
unsigned int pin,
enum i40e_ptp_gpio_pin_state state)
{
switch (state) {
case off:
wr32(hw, I40E_GLGEN_GPIO_CTL(pin), 0);
break;
case in_A:
wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
I40E_GLGEN_GPIO_CTL_PORT_0_IN_TIMESYNC_0);
break;
case in_B:
wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
I40E_GLGEN_GPIO_CTL_PORT_1_IN_TIMESYNC_0);
break;
case out_A:
wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
I40E_GLGEN_GPIO_CTL_PORT_0_OUT_TIMESYNC_1);
break;
case out_B:
wr32(hw, I40E_GLGEN_GPIO_CTL(pin),
I40E_GLGEN_GPIO_CTL_PORT_1_OUT_TIMESYNC_1);
break;
default:
break;
}
}
/**
* i40e_ptp_set_led_hw - Set HW GPIO led
* @hw: pointer to the hardware structure
* @led: led index
* @state: led state
*
* Set status of GPIO led for external clock handling.
**/
static void i40e_ptp_set_led_hw(struct i40e_hw *hw,
unsigned int led,
enum i40e_ptp_led_pin_state state)
{
switch (state) {
case low:
wr32(hw, I40E_GLGEN_GPIO_SET,
I40E_GLGEN_GPIO_SET_DRV_SDP_DATA | led);
break;
case high:
wr32(hw, I40E_GLGEN_GPIO_SET,
I40E_GLGEN_GPIO_SET_DRV_SDP_DATA |
I40E_GLGEN_GPIO_SET_SDP_DATA_HI | led);
break;
default:
break;
}
}
/**
* i40e_ptp_init_leds_hw - init LEDs
* @hw: pointer to a hardware structure
*
* Set initial state of LEDs
**/
static void i40e_ptp_init_leds_hw(struct i40e_hw *hw)
{
wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED2_0),
I40E_GLGEN_GPIO_CTL_LED_INIT);
wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED2_1),
I40E_GLGEN_GPIO_CTL_LED_INIT);
wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED3_0),
I40E_GLGEN_GPIO_CTL_LED_INIT);
wr32(hw, I40E_GLGEN_GPIO_CTL(I40E_LED3_1),
I40E_GLGEN_GPIO_CTL_LED_INIT);
}
/**
* i40e_ptp_set_pins_hw - Set HW GPIO pins
* @pf: Board private structure
*
* This function sets GPIO pins for PTP
**/
static void i40e_ptp_set_pins_hw(struct i40e_pf *pf)
{
const struct i40e_ptp_pins_settings *pins = pf->ptp_pins;
struct i40e_hw *hw = &pf->hw;
/* pin must be disabled before it may be used */
i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, off);
i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, off);
i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, off);
i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, pins->sdp3_2);
i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, pins->sdp3_3);
i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, pins->gpio_4);
i40e_ptp_set_led_hw(hw, I40E_LED2_0, pins->led2_0);
i40e_ptp_set_led_hw(hw, I40E_LED2_1, pins->led2_1);
i40e_ptp_set_led_hw(hw, I40E_LED3_0, pins->led3_0);
i40e_ptp_set_led_hw(hw, I40E_LED3_1, pins->led3_1);
dev_info(&pf->pdev->dev,
"PTP configuration set to: SDP3_2: %s, SDP3_3: %s, GPIO_4: %s.\n",
i40e_ptp_gpio_pin_state2str[pins->sdp3_2],
i40e_ptp_gpio_pin_state2str[pins->sdp3_3],
i40e_ptp_gpio_pin_state2str[pins->gpio_4]);
}
/**
* i40e_ptp_set_pins - set PTP pins in HW
* @pf: Board private structure
* @pins: PTP pins to be applied
*
* Validate and set PTP pins in HW for specific PF.
* Return 0 on success or negative value on error.
**/
static int i40e_ptp_set_pins(struct i40e_pf *pf,
struct i40e_ptp_pins_settings *pins)
{
enum i40e_can_set_pins_t pin_caps = i40e_can_set_pins(pf);
int i = 0;
if (pin_caps == CANT_DO_PINS)
return -EOPNOTSUPP;
else if (pin_caps == CAN_DO_PINS)
return 0;
if (pins->sdp3_2 == invalid)
pins->sdp3_2 = pf->ptp_pins->sdp3_2;
if (pins->sdp3_3 == invalid)
pins->sdp3_3 = pf->ptp_pins->sdp3_3;
if (pins->gpio_4 == invalid)
pins->gpio_4 = pf->ptp_pins->gpio_4;
while (i40e_ptp_pin_led_allowed_states[i].sdp3_2 != end) {
if (pins->sdp3_2 == i40e_ptp_pin_led_allowed_states[i].sdp3_2 &&
pins->sdp3_3 == i40e_ptp_pin_led_allowed_states[i].sdp3_3 &&
pins->gpio_4 == i40e_ptp_pin_led_allowed_states[i].gpio_4) {
pins->led2_0 =
i40e_ptp_pin_led_allowed_states[i].led2_0;
pins->led2_1 =
i40e_ptp_pin_led_allowed_states[i].led2_1;
pins->led3_0 =
i40e_ptp_pin_led_allowed_states[i].led3_0;
pins->led3_1 =
i40e_ptp_pin_led_allowed_states[i].led3_1;
break;
}
i++;
}
if (i40e_ptp_pin_led_allowed_states[i].sdp3_2 == end) {
dev_warn(&pf->pdev->dev,
"Unsupported PTP pin configuration: SDP3_2: %s, SDP3_3: %s, GPIO_4: %s.\n",
i40e_ptp_gpio_pin_state2str[pins->sdp3_2],
i40e_ptp_gpio_pin_state2str[pins->sdp3_3],
i40e_ptp_gpio_pin_state2str[pins->gpio_4]);
return -EPERM;
}
memcpy(pf->ptp_pins, pins, sizeof(*pins));
i40e_ptp_set_pins_hw(pf);
i40_ptp_reset_timing_events(pf);
return 0;
}
/**
* i40e_ptp_alloc_pins - allocate PTP pins structure
* @pf: Board private structure
*
* allocate PTP pins structure
**/
int i40e_ptp_alloc_pins(struct i40e_pf *pf)
{
if (!i40e_is_ptp_pin_dev(&pf->hw))
return 0;
pf->ptp_pins =
kzalloc(sizeof(struct i40e_ptp_pins_settings), GFP_KERNEL);
if (!pf->ptp_pins) {
dev_warn(&pf->pdev->dev, "Cannot allocate memory for PTP pins structure.\n");
return -I40E_ERR_NO_MEMORY;
}
pf->ptp_pins->sdp3_2 = off;
pf->ptp_pins->sdp3_3 = off;
pf->ptp_pins->gpio_4 = off;
pf->ptp_pins->led2_0 = high;
pf->ptp_pins->led2_1 = high;
pf->ptp_pins->led3_0 = high;
pf->ptp_pins->led3_1 = high;
/* Use PF0 to set pins in HW. Return success for user space tools */
if (pf->hw.pf_id)
return 0;
i40e_ptp_init_leds_hw(&pf->hw);
i40e_ptp_set_pins_hw(pf);
return 0;
}
/**
* i40e_ptp_set_timestamp_mode - setup hardware for requested timestamp mode
* @pf: Board private structure
* @config: hwtstamp settings requested or saved
*
* Control hardware registers to enter the specific mode requested by the
* user. Also used during reset path to ensure that timestamp settings are
* maintained.
*
* Note: modifies config in place, and may update the requested mode to be
* more broad if the specific filter is not directly supported.
**/
static int i40e_ptp_set_timestamp_mode(struct i40e_pf *pf,
struct hwtstamp_config *config)
{
struct i40e_hw *hw = &pf->hw;
u32 tsyntype, regval;
/* Selects external trigger to cause event */
regval = rd32(hw, I40E_PRTTSYN_AUX_0(0));
/* Bit 17:16 is EVNTLVL, 01B rising edge */
regval &= 0;
regval |= (1 << I40E_PRTTSYN_AUX_0_EVNTLVL_SHIFT);
/* regval: 0001 0000 0000 0000 0000 */
wr32(hw, I40E_PRTTSYN_AUX_0(0), regval);
/* Enabel interrupts */
regval = rd32(hw, I40E_PRTTSYN_CTL0);
regval |= 1 << I40E_PRTTSYN_CTL0_EVENT_INT_ENA_SHIFT;
wr32(hw, I40E_PRTTSYN_CTL0, regval);
INIT_WORK(&pf->ptp_extts0_work, i40e_ptp_extts0_work);
switch (config->tx_type) {
case HWTSTAMP_TX_OFF:
pf->ptp_tx = false;
break;
case HWTSTAMP_TX_ON:
pf->ptp_tx = true;
break;
default:
return -ERANGE;
}
switch (config->rx_filter) {
case HWTSTAMP_FILTER_NONE:
pf->ptp_rx = false;
/* We set the type to V1, but do not enable UDP packet
* recognition. In this way, we should be as close to
* disabling PTP Rx timestamps as possible since V1 packets
* are always UDP, since L2 packets are a V2 feature.
*/
tsyntype = I40E_PRTTSYN_CTL1_TSYNTYPE_V1;
break;
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE))
return -ERANGE;
pf->ptp_rx = true;
tsyntype = I40E_PRTTSYN_CTL1_V1MESSTYPE0_MASK |
I40E_PRTTSYN_CTL1_TSYNTYPE_V1 |
I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
config->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;
break;
case HWTSTAMP_FILTER_PTP_V2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
if (!(pf->hw_features & I40E_HW_PTP_L4_CAPABLE))
return -ERANGE;
fallthrough;
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
pf->ptp_rx = true;
tsyntype = I40E_PRTTSYN_CTL1_V2MESSTYPE0_MASK |
I40E_PRTTSYN_CTL1_TSYNTYPE_V2;
if (pf->hw_features & I40E_HW_PTP_L4_CAPABLE) {
tsyntype |= I40E_PRTTSYN_CTL1_UDP_ENA_MASK;
config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
} else {
config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
}
break;
case HWTSTAMP_FILTER_NTP_ALL:
case HWTSTAMP_FILTER_ALL:
default:
return -ERANGE;
}
/* Clear out all 1588-related registers to clear and unlatch them. */
spin_lock_bh(&pf->ptp_rx_lock);
rd32(hw, I40E_PRTTSYN_STAT_0);
rd32(hw, I40E_PRTTSYN_TXTIME_H);
rd32(hw, I40E_PRTTSYN_RXTIME_H(0));
rd32(hw, I40E_PRTTSYN_RXTIME_H(1));
rd32(hw, I40E_PRTTSYN_RXTIME_H(2));
rd32(hw, I40E_PRTTSYN_RXTIME_H(3));
pf->latch_event_flags = 0;
spin_unlock_bh(&pf->ptp_rx_lock);
/* Enable/disable the Tx timestamp interrupt based on user input. */
regval = rd32(hw, I40E_PRTTSYN_CTL0);
if (pf->ptp_tx)
regval |= I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
else
regval &= ~I40E_PRTTSYN_CTL0_TXTIME_INT_ENA_MASK;
wr32(hw, I40E_PRTTSYN_CTL0, regval);
regval = rd32(hw, I40E_PFINT_ICR0_ENA);
if (pf->ptp_tx)
regval |= I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
else
regval &= ~I40E_PFINT_ICR0_ENA_TIMESYNC_MASK;
wr32(hw, I40E_PFINT_ICR0_ENA, regval);
/* Although there is no simple on/off switch for Rx, we "disable" Rx
* timestamps by setting to V1 only mode and clear the UDP
* recognition. This ought to disable all PTP Rx timestamps as V1
* packets are always over UDP. Note that software is configured to
* ignore Rx timestamps via the pf->ptp_rx flag.
*/
regval = rd32(hw, I40E_PRTTSYN_CTL1);
/* clear everything but the enable bit */
regval &= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
/* now enable bits for desired Rx timestamps */
regval |= tsyntype;
wr32(hw, I40E_PRTTSYN_CTL1, regval);
return 0;
}
/**
* i40e_ptp_set_ts_config - ioctl interface to control the HW timestamping
* @pf: Board private structure
* @ifr: ioctl data
*
* Respond to the user filter requests and make the appropriate hardware
* changes here. The XL710 cannot support splitting of the Tx/Rx timestamping
* logic, so keep track in software of whether to indicate these timestamps
* or not.
*
* It is permissible to "upgrade" the user request to a broader filter, as long
* as the user receives the timestamps they care about and the user is notified
* the filter has been broadened.
**/
int i40e_ptp_set_ts_config(struct i40e_pf *pf, struct ifreq *ifr)
{
struct hwtstamp_config config;
int err;
if (!(pf->flags & I40E_FLAG_PTP))
return -EOPNOTSUPP;
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
err = i40e_ptp_set_timestamp_mode(pf, &config);
if (err)
return err;
/* save these settings for future reference */
pf->tstamp_config = config;
return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
-EFAULT : 0;
}
/**
* i40e_init_pin_config - initialize pins.
* @pf: private board structure
*
* Initialize pins for external clock source.
* Return 0 on success or error code on failure.
**/
static int i40e_init_pin_config(struct i40e_pf *pf)
{
int i;
pf->ptp_caps.n_pins = 3;
pf->ptp_caps.n_ext_ts = 2;
pf->ptp_caps.pps = 1;
pf->ptp_caps.n_per_out = 2;
pf->ptp_caps.pin_config = kcalloc(pf->ptp_caps.n_pins,
sizeof(*pf->ptp_caps.pin_config),
GFP_KERNEL);
if (!pf->ptp_caps.pin_config)
return -ENOMEM;
for (i = 0; i < pf->ptp_caps.n_pins; i++) {
snprintf(pf->ptp_caps.pin_config[i].name,
sizeof(pf->ptp_caps.pin_config[i].name),
"%s", sdp_desc[i].name);
pf->ptp_caps.pin_config[i].index = sdp_desc[i].index;
pf->ptp_caps.pin_config[i].func = PTP_PF_NONE;
pf->ptp_caps.pin_config[i].chan = sdp_desc[i].chan;
}
pf->ptp_caps.verify = i40e_ptp_verify;
pf->ptp_caps.enable = i40e_ptp_feature_enable;
pf->ptp_caps.pps = 1;
return 0;
}
/**
* i40e_ptp_create_clock - Create PTP clock device for userspace
* @pf: Board private structure
*
* This function creates a new PTP clock device. It only creates one if we
* don't already have one, so it is safe to call. Will return error if it
* can't create one, but success if we already have a device. Should be used
* by i40e_ptp_init to create clock initially, and prevent global resets from
* creating new clock devices.
**/
static long i40e_ptp_create_clock(struct i40e_pf *pf)
{
/* no need to create a clock device if we already have one */
if (!IS_ERR_OR_NULL(pf->ptp_clock))
return 0;
strscpy(pf->ptp_caps.name, i40e_driver_name,
sizeof(pf->ptp_caps.name) - 1);
pf->ptp_caps.owner = THIS_MODULE;
pf->ptp_caps.max_adj = 999999999;
pf->ptp_caps.adjfine = i40e_ptp_adjfine;
pf->ptp_caps.adjtime = i40e_ptp_adjtime;
pf->ptp_caps.gettimex64 = i40e_ptp_gettimex;
pf->ptp_caps.settime64 = i40e_ptp_settime;
if (i40e_is_ptp_pin_dev(&pf->hw)) {
int err = i40e_init_pin_config(pf);
if (err)
return err;
}
/* Attempt to register the clock before enabling the hardware. */
pf->ptp_clock = ptp_clock_register(&pf->ptp_caps, &pf->pdev->dev);
if (IS_ERR(pf->ptp_clock))
return PTR_ERR(pf->ptp_clock);
/* clear the hwtstamp settings here during clock create, instead of
* during regular init, so that we can maintain settings across a
* reset or suspend.
*/
pf->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
pf->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
/* Set the previous "reset" time to the current Kernel clock time */
ktime_get_real_ts64(&pf->ptp_prev_hw_time);
pf->ptp_reset_start = ktime_get();
return 0;
}
/**
* i40e_ptp_save_hw_time - Save the current PTP time as ptp_prev_hw_time
* @pf: Board private structure
*
* Read the current PTP time and save it into pf->ptp_prev_hw_time. This should
* be called at the end of preparing to reset, just before hardware reset
* occurs, in order to preserve the PTP time as close as possible across
* resets.
*/
void i40e_ptp_save_hw_time(struct i40e_pf *pf)
{
/* don't try to access the PTP clock if it's not enabled */
if (!(pf->flags & I40E_FLAG_PTP))
return;
i40e_ptp_gettimex(&pf->ptp_caps, &pf->ptp_prev_hw_time, NULL);
/* Get a monotonic starting time for this reset */
pf->ptp_reset_start = ktime_get();
}
/**
* i40e_ptp_restore_hw_time - Restore the ptp_prev_hw_time + delta to PTP regs
* @pf: Board private structure
*
* Restore the PTP hardware clock registers. We previously cached the PTP
* hardware time as pf->ptp_prev_hw_time. To be as accurate as possible,
* update this value based on the time delta since the time was saved, using
* CLOCK_MONOTONIC (via ktime_get()) to calculate the time difference.
*
* This ensures that the hardware clock is restored to nearly what it should
* have been if a reset had not occurred.
*/
void i40e_ptp_restore_hw_time(struct i40e_pf *pf)
{
ktime_t delta = ktime_sub(ktime_get(), pf->ptp_reset_start);
/* Update the previous HW time with the ktime delta */
timespec64_add_ns(&pf->ptp_prev_hw_time, ktime_to_ns(delta));
/* Restore the hardware clock registers */
i40e_ptp_settime(&pf->ptp_caps, &pf->ptp_prev_hw_time);
}
/**
* i40e_ptp_init - Initialize the 1588 support after device probe or reset
* @pf: Board private structure
*
* This function sets device up for 1588 support. The first time it is run, it
* will create a PHC clock device. It does not create a clock device if one
* already exists. It also reconfigures the device after a reset.
*
* The first time a clock is created, i40e_ptp_create_clock will set
* pf->ptp_prev_hw_time to the current system time. During resets, it is
* expected that this timespec will be set to the last known PTP clock time,
* in order to preserve the clock time as close as possible across a reset.
**/
void i40e_ptp_init(struct i40e_pf *pf)
{
struct net_device *netdev = pf->vsi[pf->lan_vsi]->netdev;
struct i40e_hw *hw = &pf->hw;
u32 pf_id;
long err;
/* Only one PF is assigned to control 1588 logic per port. Do not
* enable any support for PFs not assigned via PRTTSYN_CTL0.PF_ID
*/
pf_id = (rd32(hw, I40E_PRTTSYN_CTL0) & I40E_PRTTSYN_CTL0_PF_ID_MASK) >>
I40E_PRTTSYN_CTL0_PF_ID_SHIFT;
if (hw->pf_id != pf_id) {
pf->flags &= ~I40E_FLAG_PTP;
dev_info(&pf->pdev->dev, "%s: PTP not supported on %s\n",
__func__,
netdev->name);
return;
}
mutex_init(&pf->tmreg_lock);
spin_lock_init(&pf->ptp_rx_lock);
/* ensure we have a clock device */
err = i40e_ptp_create_clock(pf);
if (err) {
pf->ptp_clock = NULL;
dev_err(&pf->pdev->dev, "%s: ptp_clock_register failed\n",
__func__);
} else if (pf->ptp_clock) {
u32 regval;
if (pf->hw.debug_mask & I40E_DEBUG_LAN)
dev_info(&pf->pdev->dev, "PHC enabled\n");
pf->flags |= I40E_FLAG_PTP;
/* Ensure the clocks are running. */
regval = rd32(hw, I40E_PRTTSYN_CTL0);
regval |= I40E_PRTTSYN_CTL0_TSYNENA_MASK;
wr32(hw, I40E_PRTTSYN_CTL0, regval);
regval = rd32(hw, I40E_PRTTSYN_CTL1);
regval |= I40E_PRTTSYN_CTL1_TSYNENA_MASK;
wr32(hw, I40E_PRTTSYN_CTL1, regval);
/* Set the increment value per clock tick. */
i40e_ptp_set_increment(pf);
/* reset timestamping mode */
i40e_ptp_set_timestamp_mode(pf, &pf->tstamp_config);
/* Restore the clock time based on last known value */
i40e_ptp_restore_hw_time(pf);
}
i40e_ptp_set_1pps_signal_hw(pf);
}
/**
* i40e_ptp_stop - Disable the driver/hardware support and unregister the PHC
* @pf: Board private structure
*
* This function handles the cleanup work required from the initialization by
* clearing out the important information and unregistering the PHC.
**/
void i40e_ptp_stop(struct i40e_pf *pf)
{
struct i40e_hw *hw = &pf->hw;
u32 regval;
pf->flags &= ~I40E_FLAG_PTP;
pf->ptp_tx = false;
pf->ptp_rx = false;
if (pf->ptp_tx_skb) {
struct sk_buff *skb = pf->ptp_tx_skb;
pf->ptp_tx_skb = NULL;
clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
dev_kfree_skb_any(skb);
}
if (pf->ptp_clock) {
ptp_clock_unregister(pf->ptp_clock);
pf->ptp_clock = NULL;
dev_info(&pf->pdev->dev, "%s: removed PHC on %s\n", __func__,
pf->vsi[pf->lan_vsi]->netdev->name);
}
if (i40e_is_ptp_pin_dev(&pf->hw)) {
i40e_ptp_set_pin_hw(hw, I40E_SDP3_2, off);
i40e_ptp_set_pin_hw(hw, I40E_SDP3_3, off);
i40e_ptp_set_pin_hw(hw, I40E_GPIO_4, off);
}
regval = rd32(hw, I40E_PRTTSYN_AUX_0(0));
regval &= ~I40E_PRTTSYN_AUX_0_PTPFLAG_MASK;
wr32(hw, I40E_PRTTSYN_AUX_0(0), regval);
/* Disable interrupts */
regval = rd32(hw, I40E_PRTTSYN_CTL0);
regval &= ~I40E_PRTTSYN_CTL0_EVENT_INT_ENA_MASK;
wr32(hw, I40E_PRTTSYN_CTL0, regval);
i40e_ptp_free_pins(pf);
}