--- /dev/null
+/*******************************************************************************
+
+ Intel 10 Gigabit PCI Express Linux driver
+ Copyright(c) 1999 - 2012 Intel Corporation.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms and conditions of the GNU General Public License,
+ version 2, as published by the Free Software Foundation.
+
+ This program is distributed in the hope it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ more details.
+
+ You should have received a copy of the GNU General Public License along with
+ this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+ The full GNU General Public License is included in this distribution in
+ the file called "COPYING".
+
+ Contact Information:
+ e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+#include "ixgbe.h"
+#include <linux/export.h>
+
+/*
+ * The 82599 and the X540 do not have true 64bit nanosecond scale
+ * counter registers. Instead, 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 the SYSTIME
+ * value. For both devices the TIMINCA:IV field defines this
+ * increment. On the X540 device, 31 bits are provided. However on the
+ * 82599 only provides 24 bits. The time unit is determined by the
+ * clock frequency of the oscillator in combination with the TIMINCA
+ * register. When these devices link at 10Gb the oscillator has a
+ * period of 6.4ns. In order to convert the scale counter into
+ * nanoseconds the cyclecounter and timecounter structures are
+ * used. The SYSTIME registers need to be converted to ns values by use
+ * of only a right shift (division by power of 2). The following math
+ * determines the largest incvalue that will fit into the available
+ * bits in the TIMINCA register.
+ *
+ * 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
+ * round(): discard the fractional portion of the calculation
+ *
+ * Period * [ 2 ^ ( MaxWidth - PeriodWidth ) ]
+ *
+ * For the X540, MaxWidth is 31 bits, and the base period is 6.4 ns
+ * For the 82599, MaxWidth is 24 bits, and the base period is 6.4 ns
+ *
+ * The period also changes based on the link speed:
+ * At 10Gb link or no link, the period remains the same.
+ * At 1Gb link, the period is multiplied by 10. (64ns)
+ * At 100Mb link, the period is multiplied by 100. (640ns)
+ *
+ * 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.
+ *
+ * These diagrams are only for the 10Gb link period
+ *
+ * SYSTIMEH SYSTIMEL
+ * +--------------+ +--------------+
+ * X540 | 32 | | 1 | 3 | 28 |
+ * *--------------+ +--------------+
+ * \________ 36 bits ______/ fract
+ *
+ * +--------------+ +--------------+
+ * 82599 | 32 | | 8 | 3 | 21 |
+ * *--------------+ +--------------+
+ * \________ 43 bits ______/ fract
+ *
+ * The 36 bit X540 SYSTIME overflows every
+ * 2^36 * 10^-9 / 60 = 1.14 minutes or 69 seconds
+ *
+ * The 43 bit 82599 SYSTIME overflows every
+ * 2^43 * 10^-9 / 3600 = 2.4 hours
+ */
+#define IXGBE_INCVAL_10GB 0x66666666
+#define IXGBE_INCVAL_1GB 0x40000000
+#define IXGBE_INCVAL_100 0x50000000
+
+#define IXGBE_INCVAL_SHIFT_10GB 28
+#define IXGBE_INCVAL_SHIFT_1GB 24
+#define IXGBE_INCVAL_SHIFT_100 21
+
+#define IXGBE_INCVAL_SHIFT_82599 7
+#define IXGBE_INCPER_SHIFT_82599 24
+#define IXGBE_MAX_TIMEADJ_VALUE 0x7FFFFFFFFFFFFFFFULL
+
+#define IXGBE_OVERFLOW_PERIOD (HZ * 30)
+
+/**
+ * ixgbe_ptp_read - read raw cycle counter (to be used by time counter)
+ * @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 cycle_t ixgbe_ptp_read(const struct cyclecounter *cc)
+{
+ struct ixgbe_adapter *adapter =
+ container_of(cc, struct ixgbe_adapter, cc);
+ struct ixgbe_hw *hw = &adapter->hw;
+ u64 stamp = 0;
+
+ stamp |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIML);
+ stamp |= (u64)IXGBE_READ_REG(hw, IXGBE_SYSTIMH) << 32;
+
+ return stamp;
+}
+
+/**
+ * ixgbe_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 ixgbe_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+ struct ixgbe_adapter *adapter =
+ container_of(ptp, struct ixgbe_adapter, ptp_caps);
+ struct ixgbe_hw *hw = &adapter->hw;
+ u64 freq;
+ u32 diff, incval;
+ int neg_adj = 0;
+
+ if (ppb < 0) {
+ neg_adj = 1;
+ ppb = -ppb;
+ }
+
+ smp_mb();
+ incval = ACCESS_ONCE(adapter->base_incval);
+
+ freq = incval;
+ freq *= ppb;
+ diff = div_u64(freq, 1000000000ULL);
+
+ incval = neg_adj ? (incval - diff) : (incval + diff);
+
+ switch (hw->mac.type) {
+ case ixgbe_mac_X540:
+ IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, incval);
+ break;
+ case ixgbe_mac_82599EB:
+ IXGBE_WRITE_REG(hw, IXGBE_TIMINCA,
+ (1 << IXGBE_INCPER_SHIFT_82599) |
+ incval);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/**
+ * ixgbe_ptp_adjtime
+ * @ptp - the ptp clock structure
+ * @delta - offset to adjust the cycle counter by
+ *
+ * adjust the timer by resetting the timecounter structure.
+ */
+static int ixgbe_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+ struct ixgbe_adapter *adapter =
+ container_of(ptp, struct ixgbe_adapter, ptp_caps);
+ unsigned long flags;
+ u64 now;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+
+ now = timecounter_read(&adapter->tc);
+ now += delta;
+
+ /* reset the timecounter */
+ timecounter_init(&adapter->tc,
+ &adapter->cc,
+ now);
+
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+ return 0;
+}
+
+/**
+ * ixgbe_ptp_gettime
+ * @ptp - the ptp clock structure
+ * @ts - timespec structure to hold the current time value
+ *
+ * read the timecounter and return the correct value on ns,
+ * after converting it into a struct timespec.
+ */
+static int ixgbe_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+ struct ixgbe_adapter *adapter =
+ container_of(ptp, struct ixgbe_adapter, ptp_caps);
+ u64 ns;
+ u32 remainder;
+ unsigned long flags;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_read(&adapter->tc);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ ts->tv_sec = div_u64_rem(ns, 1000000000ULL, &remainder);
+ ts->tv_nsec = remainder;
+
+ return 0;
+}
+
+/**
+ * ixgbe_ptp_settime
+ * @ptp - the ptp clock structure
+ * @ts - the timespec 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 ixgbe_ptp_settime(struct ptp_clock_info *ptp,
+ const struct timespec *ts)
+{
+ struct ixgbe_adapter *adapter =
+ container_of(ptp, struct ixgbe_adapter, ptp_caps);
+ u64 ns;
+ unsigned long flags;
+
+ ns = ts->tv_sec * 1000000000ULL;
+ ns += ts->tv_nsec;
+
+ /* reset the timecounter */
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ timecounter_init(&adapter->tc, &adapter->cc, ns);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ return 0;
+}
+
+/**
+ * ixgbe_ptp_enable
+ * @ptp - the ptp clock structure
+ * @rq - the requested feature to change
+ * @on - whether to enable or disable the feature
+ *
+ * enable (or disable) ancillary features of the phc subsystem.
+ * our driver does not support any of these features
+ */
+static int ixgbe_ptp_enable(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *rq, int on)
+{
+ return -ENOTSUPP;
+}
+
+/**
+ * ixgbe_ptp_overflow_check - delayed work to detect SYSTIME overflow
+ * @work: structure containing information about this work task
+ *
+ * this work function is scheduled to continue reading the timecounter
+ * in order to prevent missing when the system time registers wrap
+ * around. This needs to be run approximately twice a minute when no
+ * PTP activity is occurring.
+ */
+void ixgbe_ptp_overflow_check(struct ixgbe_adapter *adapter)
+{
+ unsigned long elapsed_jiffies = adapter->last_overflow_check - jiffies;
+ struct timespec ts;
+
+ if ((adapter->flags2 & IXGBE_FLAG2_OVERFLOW_CHECK_ENABLED) &&
+ (elapsed_jiffies >= IXGBE_OVERFLOW_PERIOD)) {
+ ixgbe_ptp_gettime(&adapter->ptp_caps, &ts);
+ adapter->last_overflow_check = jiffies;
+ }
+}
+
+/**
+ * ixgbe_ptp_tx_hwtstamp - utility function which checks for TX 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 ixgbe_ptp_tx_hwtstamp(struct ixgbe_q_vector *q_vector,
+ struct sk_buff *skb)
+{
+ struct ixgbe_adapter *adapter;
+ struct ixgbe_hw *hw;
+ struct skb_shared_hwtstamps shhwtstamps;
+ u64 regval = 0, ns;
+ u32 tsynctxctl;
+ unsigned long flags;
+
+ /* we cannot process timestamps on a ring without a q_vector */
+ if (!q_vector || !q_vector->adapter)
+ return;
+
+ adapter = q_vector->adapter;
+ hw = &adapter->hw;
+
+ tsynctxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCTXCTL);
+ regval |= (u64)IXGBE_READ_REG(hw, IXGBE_TXSTMPL);
+ regval |= (u64)IXGBE_READ_REG(hw, IXGBE_TXSTMPH) << 32;
+
+ /*
+ * if TX timestamp is not valid, exit after clearing the
+ * timestamp registers
+ */
+ if (!(tsynctxctl & IXGBE_TSYNCTXCTL_VALID))
+ return;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_cyc2time(&adapter->tc, regval);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+ shhwtstamps.hwtstamp = ns_to_ktime(ns);
+ skb_tstamp_tx(skb, &shhwtstamps);
+}
+
+/**
+ * ixgbe_ptp_rx_hwtstamp - 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 ixgbe_ptp_rx_hwtstamp(struct ixgbe_q_vector *q_vector,
+ struct sk_buff *skb)
+{
+ struct ixgbe_adapter *adapter;
+ struct ixgbe_hw *hw;
+ struct skb_shared_hwtstamps *shhwtstamps;
+ u64 regval = 0, ns;
+ u32 tsyncrxctl;
+ unsigned long flags;
+
+ /* we cannot process timestamps on a ring without a q_vector */
+ if (!q_vector || !q_vector->adapter)
+ return;
+
+ adapter = q_vector->adapter;
+ hw = &adapter->hw;
+
+ tsyncrxctl = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL);
+ regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPL);
+ regval |= (u64)IXGBE_READ_REG(hw, IXGBE_RXSTMPH) << 32;
+
+ /*
+ * If this bit is set, then the RX registers contain the time stamp. No
+ * other packet will be time stamped until we read these registers, so
+ * read the registers to make them available again. Because only one
+ * packet can be time stamped at a time, we know that the register
+ * values must belong to this one here and therefore we don't need to
+ * compare any of the additional attributes stored for it.
+ *
+ * If nothing went wrong, then it should have a skb_shared_tx that we
+ * can turn into a skb_shared_hwtstamps.
+ */
+ if (!(tsyncrxctl & IXGBE_TSYNCRXCTL_VALID))
+ return;
+
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_cyc2time(&adapter->tc, regval);
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ shhwtstamps = skb_hwtstamps(skb);
+ shhwtstamps->hwtstamp = ns_to_ktime(ns);
+}
+
+/**
+ * ixgbe_ptp_hwtstamp_ioctl - control hardware time stamping
+ * @adapter: pointer to adapter struct
+ * @ifreq: ioctl data
+ * @cmd: particular ioctl requested
+ *
+ * Outgoing time stamping can be enabled and disabled. Play nice and
+ * disable it when requested, although it shouldn't case 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".
+ */
+int ixgbe_ptp_hwtstamp_ioctl(struct ixgbe_adapter *adapter,
+ struct ifreq *ifr, int cmd)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ struct hwtstamp_config config;
+ u32 tsync_tx_ctl = IXGBE_TSYNCTXCTL_ENABLED;
+ u32 tsync_rx_ctl = IXGBE_TSYNCRXCTL_ENABLED;
+ u32 tsync_rx_mtrl = 0;
+ bool is_l4 = false;
+ bool is_l2 = false;
+ u32 regval;
+
+ if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ /* 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;
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_L4_V1;
+ tsync_rx_mtrl = IXGBE_RXMTRL_V1_SYNC_MSG;
+ is_l4 = true;
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_L4_V1;
+ tsync_rx_mtrl = IXGBE_RXMTRL_V1_DELAY_REQ_MSG;
+ is_l4 = true;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_L2_L4_V2;
+ tsync_rx_mtrl = IXGBE_RXMTRL_V2_SYNC_MSG;
+ is_l2 = true;
+ is_l4 = true;
+ config.rx_filter = HWTSTAMP_FILTER_SOME;
+ break;
+ 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 |= IXGBE_TSYNCRXCTL_TYPE_L2_L4_V2;
+ tsync_rx_mtrl = IXGBE_RXMTRL_V2_DELAY_REQ_MSG;
+ is_l2 = true;
+ is_l4 = true;
+ config.rx_filter = HWTSTAMP_FILTER_SOME;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ tsync_rx_ctl |= IXGBE_TSYNCRXCTL_TYPE_EVENT_V2;
+ config.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
+ is_l2 = true;
+ is_l4 = true;
+ break;
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_ALL:
+ default:
+ /*
+ * register RXMTRL must be set, therefore it is not
+ * possible to time stamp both V1 Sync and Delay_Req messages
+ * and hardware does not support timestamping all packets
+ * => return error
+ */
+ return -ERANGE;
+ }
+
+ if (hw->mac.type == ixgbe_mac_82598EB) {
+ if (tsync_rx_ctl | tsync_tx_ctl)
+ return -ERANGE;
+ return 0;
+ }
+
+ /* define ethertype filter for timestamped packets */
+ if (is_l2)
+ IXGBE_WRITE_REG(hw, IXGBE_ETQF(3),
+ (IXGBE_ETQF_FILTER_EN | /* enable filter */
+ IXGBE_ETQF_1588 | /* enable timestamping */
+ ETH_P_1588)); /* 1588 eth protocol type */
+ else
+ IXGBE_WRITE_REG(hw, IXGBE_ETQF(3), 0);
+
+#define PTP_PORT 319
+ /* L4 Queue Filter[3]: filter by destination port and protocol */
+ if (is_l4) {
+ u32 ftqf = (IXGBE_FTQF_PROTOCOL_UDP /* UDP */
+ | IXGBE_FTQF_POOL_MASK_EN /* Pool not compared */
+ | IXGBE_FTQF_QUEUE_ENABLE);
+
+ ftqf |= ((IXGBE_FTQF_PROTOCOL_COMP_MASK /* protocol check */
+ & IXGBE_FTQF_DEST_PORT_MASK /* dest check */
+ & IXGBE_FTQF_SOURCE_PORT_MASK) /* source check */
+ << IXGBE_FTQF_5TUPLE_MASK_SHIFT);
+
+ IXGBE_WRITE_REG(hw, IXGBE_L34T_IMIR(3),
+ (3 << IXGBE_IMIR_RX_QUEUE_SHIFT_82599 |
+ IXGBE_IMIR_SIZE_BP_82599));
+
+ /* enable port check */
+ IXGBE_WRITE_REG(hw, IXGBE_SDPQF(3),
+ (htons(PTP_PORT) |
+ htons(PTP_PORT) << 16));
+
+ IXGBE_WRITE_REG(hw, IXGBE_FTQF(3), ftqf);
+
+ tsync_rx_mtrl |= PTP_PORT << 16;
+ } else {
+ IXGBE_WRITE_REG(hw, IXGBE_FTQF(3), 0);
+ }
+
+ /* enable/disable TX */
+ regval = IXGBE_READ_REG(hw, IXGBE_TSYNCTXCTL);
+ regval &= ~IXGBE_TSYNCTXCTL_ENABLED;
+ regval |= tsync_tx_ctl;
+ IXGBE_WRITE_REG(hw, IXGBE_TSYNCTXCTL, regval);
+
+ /* enable/disable RX */
+ regval = IXGBE_READ_REG(hw, IXGBE_TSYNCRXCTL);
+ regval &= ~(IXGBE_TSYNCRXCTL_ENABLED | IXGBE_TSYNCRXCTL_TYPE_MASK);
+ regval |= tsync_rx_ctl;
+ IXGBE_WRITE_REG(hw, IXGBE_TSYNCRXCTL, regval);
+
+ /* define which PTP packets are time stamped */
+ IXGBE_WRITE_REG(hw, IXGBE_RXMTRL, tsync_rx_mtrl);
+
+ IXGBE_WRITE_FLUSH(hw);
+
+ /* clear TX/RX time stamp registers, just to be sure */
+ regval = IXGBE_READ_REG(hw, IXGBE_TXSTMPH);
+ regval = IXGBE_READ_REG(hw, IXGBE_RXSTMPH);
+
+ return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+/**
+ * ixgbe_ptp_start_cyclecounter - create the cycle counter from hw
+ * @adapter - pointer to the adapter structure
+ *
+ * this function initializes the timecounter and cyclecounter
+ * structures for use in generated a ns counter from the arbitrary
+ * fixed point cycles registers in the hardware.
+ *
+ * A change in link speed impacts the frequency of the DMA clock on
+ * the device, which is used to generate the cycle counter
+ * registers. Therefor this function is called whenever the link speed
+ * changes.
+ */
+void ixgbe_ptp_start_cyclecounter(struct ixgbe_adapter *adapter)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 incval = 0;
+ u32 shift = 0;
+ u32 cycle_speed;
+ unsigned long flags;
+
+ /**
+ * Determine what speed we need to set the cyclecounter
+ * for. It should be different for 100Mb, 1Gb, and 10Gb. Treat
+ * unknown speeds as 10Gb. (Hence why we can't just copy the
+ * link_speed.
+ */
+ switch (adapter->link_speed) {
+ case IXGBE_LINK_SPEED_100_FULL:
+ case IXGBE_LINK_SPEED_1GB_FULL:
+ case IXGBE_LINK_SPEED_10GB_FULL:
+ cycle_speed = adapter->link_speed;
+ break;
+ default:
+ /* cycle speed should be 10Gb when there is no link */
+ cycle_speed = IXGBE_LINK_SPEED_10GB_FULL;
+ break;
+ }
+
+ /* Bail if the cycle speed didn't change */
+ if (adapter->cycle_speed == cycle_speed)
+ return;
+
+ /**
+ * 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
+ */
+ switch (cycle_speed) {
+ case IXGBE_LINK_SPEED_100_FULL:
+ incval = IXGBE_INCVAL_100;
+ shift = IXGBE_INCVAL_SHIFT_100;
+ break;
+ case IXGBE_LINK_SPEED_1GB_FULL:
+ incval = IXGBE_INCVAL_1GB;
+ shift = IXGBE_INCVAL_SHIFT_1GB;
+ break;
+ case IXGBE_LINK_SPEED_10GB_FULL:
+ incval = IXGBE_INCVAL_10GB;
+ shift = IXGBE_INCVAL_SHIFT_10GB;
+ break;
+ }
+
+ /**
+ * Modify the calculated values to fit within the correct
+ * number of bits specified by the hardware. The 82599 doesn't
+ * have the same space as the X540, so bitshift the calculated
+ * values to fit.
+ */
+ switch (hw->mac.type) {
+ case ixgbe_mac_X540:
+ IXGBE_WRITE_REG(hw, IXGBE_TIMINCA, incval);
+ break;
+ case ixgbe_mac_82599EB:
+ incval >>= IXGBE_INCVAL_SHIFT_82599;
+ shift -= IXGBE_INCVAL_SHIFT_82599;
+ IXGBE_WRITE_REG(hw, IXGBE_TIMINCA,
+ (1 << IXGBE_INCPER_SHIFT_82599) |
+ incval);
+ break;
+ default:
+ /* other devices aren't supported */
+ return;
+ }
+
+ /* reset the system time registers */
+ IXGBE_WRITE_REG(hw, IXGBE_SYSTIML, 0x00000000);
+ IXGBE_WRITE_REG(hw, IXGBE_SYSTIMH, 0x00000000);
+ IXGBE_WRITE_FLUSH(hw);
+
+ /* store the new cycle speed */
+ adapter->cycle_speed = cycle_speed;
+
+ ACCESS_ONCE(adapter->base_incval) = incval;
+ smp_mb();
+
+ /* grab the ptp lock */
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+
+ memset(&adapter->cc, 0, sizeof(adapter->cc));
+ adapter->cc.read = ixgbe_ptp_read;
+ adapter->cc.mask = CLOCKSOURCE_MASK(64);
+ adapter->cc.shift = shift;
+ adapter->cc.mult = 1;
+
+ /* reset the ns time counter */
+ timecounter_init(&adapter->tc, &adapter->cc,
+ ktime_to_ns(ktime_get_real()));
+
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+}
+
+/**
+ * ixgbe_ptp_init
+ * @adapter - the ixgbe 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 ixgbe_ptp_init(struct ixgbe_adapter *adapter)
+{
+ struct net_device *netdev = adapter->netdev;
+
+ switch (adapter->hw.mac.type) {
+ case ixgbe_mac_X540:
+ case ixgbe_mac_82599EB:
+ snprintf(adapter->ptp_caps.name, 16, "%pm", netdev->dev_addr);
+ adapter->ptp_caps.owner = THIS_MODULE;
+ adapter->ptp_caps.max_adj = 250000000;
+ 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 = ixgbe_ptp_adjfreq;
+ adapter->ptp_caps.adjtime = ixgbe_ptp_adjtime;
+ adapter->ptp_caps.gettime = ixgbe_ptp_gettime;
+ adapter->ptp_caps.settime = ixgbe_ptp_settime;
+ adapter->ptp_caps.enable = ixgbe_ptp_enable;
+ break;
+ default:
+ adapter->ptp_clock = NULL;
+ return;
+ }
+
+ spin_lock_init(&adapter->tmreg_lock);
+
+ ixgbe_ptp_start_cyclecounter(adapter);
+
+ /* (Re)start the overflow check */
+ adapter->flags2 |= IXGBE_FLAG2_OVERFLOW_CHECK_ENABLED;
+
+ adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps);
+ if (IS_ERR(adapter->ptp_clock)) {
+ adapter->ptp_clock = NULL;
+ e_dev_err("ptp_clock_register failed\n");
+ } else
+ e_dev_info("registered PHC device on %s\n", netdev->name);
+
+ return;
+}
+
+/**
+ * ixgbe_ptp_stop - disable ptp device and stop the overflow check
+ * @adapter: pointer to adapter struct
+ *
+ * this function stops the ptp support, and cancels the delayed work.
+ */
+void ixgbe_ptp_stop(struct ixgbe_adapter *adapter)
+{
+ /* stop the overflow check task */
+ adapter->flags2 &= ~IXGBE_FLAG2_OVERFLOW_CHECK_ENABLED;
+
+ if (adapter->ptp_clock) {
+ ptp_clock_unregister(adapter->ptp_clock);
+ adapter->ptp_clock = NULL;
+ e_dev_info("removed PHC on %s\n",
+ adapter->netdev->name);
+ }
+}
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff