[Intel-wired-lan] [PATCH v2] ixgbe: implement support for SDP/PPS output on X550 hardware
Jacob Keller
jacob.e.keller at intel.com
Fri Apr 12 15:33:19 UTC 2019
Similar to the X540 hardware, enable support for generating a 1pps
output signal on SDP0.
This support is slightly different to the X540 hardware, because of the
register layout changes. First, the system time register is now
represented in 'cycles' and 'billions of cycles'. Second, we need to
also program the TSSDP register, as well as the ESDP register. Third,
the clock output uses only FREQOUT, instead of a full 64bit value for
the output clock period. Finally, we have to use the ST0 bit instead of
the SYNCLK bit in the TSAUXC register.
This support should work even for the hardware with a higher frequency
clock, as it carefully takes into account the multiply and shift of the
cycle counter used.
We also set the pps configuration to 1, since we now support generating
a pulse per second output.
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c | 99 ++++++++++++++++++-
drivers/net/ethernet/intel/ixgbe/ixgbe_type.h | 14 ++-
2 files changed, 108 insertions(+), 5 deletions(-)
Changes in v2
* use div_u64 instead of a divide instruction, to avoid issues with 64bit
division on 32bit platforms.
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
index 047767408df0..21b02ec55013 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c
@@ -224,6 +224,101 @@ static void ixgbe_ptp_setup_sdp_X540(struct ixgbe_adapter *adapter)
IXGBE_WRITE_FLUSH(hw);
}
+/**
+ * ixgbe_ptp_setup_sdp_X550
+ * @adapter: private adapter structure
+ *
+ * Enable or disable a clock output signal on SDP 0 for X550 hardware.
+ *
+ * Use the target time feature to align the output signal on the next full
+ * second.
+ *
+ * This works by using the cycle counter shift and mult values in reverse, and
+ * assumes that the values we're shifting will not overflow.
+ */
+static void ixgbe_ptp_setup_sdp_X550(struct ixgbe_adapter *adapter)
+{
+ struct cyclecounter *cc = &adapter->hw_cc;
+ struct ixgbe_hw *hw = &adapter->hw;
+ u32 esdp, tsauxc, freqout, trgttiml, trgttimh, rem, tssdp;
+ u64 ns = 0, clock_edge = 0;
+ struct timespec64 ts;
+ unsigned long flags;
+
+ /* disable the pin first */
+ IXGBE_WRITE_REG(hw, IXGBE_TSAUXC, 0x0);
+ IXGBE_WRITE_FLUSH(hw);
+
+ if (!(adapter->flags2 & IXGBE_FLAG2_PTP_PPS_ENABLED))
+ return;
+
+ esdp = IXGBE_READ_REG(hw, IXGBE_ESDP);
+
+ /* enable the SDP0 pin as output, and connected to the
+ * native function for Timesync (ClockOut)
+ */
+ esdp |= IXGBE_ESDP_SDP0_DIR |
+ IXGBE_ESDP_SDP0_NATIVE;
+
+ /* enable the Clock Out feature on SDP0, and use Target Time 0 to
+ * enable generation of interrupts on the clock change.
+ */
+#define IXGBE_TSAUXC_DIS_TS_CLEAR 0x40000000
+ tsauxc = (IXGBE_TSAUXC_EN_CLK | IXGBE_TSAUXC_ST0 |
+ IXGBE_TSAUXC_EN_TT0 | IXGBE_TSAUXC_SDP0_INT |
+ IXGBE_TSAUXC_DIS_TS_CLEAR);
+
+ tssdp = (IXGBE_TSSDP_TS_SDP0_EN |
+ IXGBE_TSSDP_TS_SDP0_CLK0);
+
+ /* Determine the clock time period to use. This assumes that the
+ * cycle counter shift is small enough to avoid overflowing a 32bit
+ * value.
+ */
+ freqout = div_u64(NS_PER_HALF_SEC << cc->shift, cc->mult);
+
+ /* Read the current clock time, and save the cycle counter value */
+ spin_lock_irqsave(&adapter->tmreg_lock, flags);
+ ns = timecounter_read(&adapter->hw_tc);
+ clock_edge = adapter->hw_tc.cycle_last;
+ spin_unlock_irqrestore(&adapter->tmreg_lock, flags);
+
+ /* Figure out how far past the next second we are */
+ div_u64_rem(ns, NS_PER_SEC, &rem);
+
+ /* Figure out how many nanoseconds to add to round the clock edge up
+ * to the next full second
+ */
+ rem = (NS_PER_SEC - rem);
+
+ /* Adjust the clock edge to align with the next full second. This
+ * assumes that the cycle counter shift is small enough to avoid
+ * overflowing when shifting the remainder.
+ */
+ clock_edge += div_u64((rem << cc->shift), cc->mult);
+
+ /* X550 hardware stores the time in 32bits of 'billions of cycles' and
+ * 32bits of 'cycles'. There's no guarantee that cycles represents
+ * nanoseconds. However, we can use the math from a timespec64 to
+ * convert into the hardware representation.
+ *
+ * See ixgbe_ptp_read_X550() for more details.
+ */
+ ts = ns_to_timespec64(clock_edge);
+ trgttiml = (u32)ts.tv_nsec;
+ trgttimh = (u32)ts.tv_sec;
+
+ IXGBE_WRITE_REG(hw, IXGBE_FREQOUT0, freqout);
+ IXGBE_WRITE_REG(hw, IXGBE_TRGTTIML0, trgttiml);
+ IXGBE_WRITE_REG(hw, IXGBE_TRGTTIMH0, trgttimh);
+
+ IXGBE_WRITE_REG(hw, IXGBE_ESDP, esdp);
+ IXGBE_WRITE_REG(hw, IXGBE_TSSDP, tssdp);
+ IXGBE_WRITE_REG(hw, IXGBE_TSAUXC, tsauxc);
+
+ IXGBE_WRITE_FLUSH(hw);
+}
+
/**
* ixgbe_ptp_read_X550 - read cycle counter value
* @hw_cc: cyclecounter structure
@@ -1293,13 +1388,13 @@ static long ixgbe_ptp_create_clock(struct ixgbe_adapter *adapter)
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.pps = 1;
adapter->ptp_caps.adjfreq = ixgbe_ptp_adjfreq_X550;
adapter->ptp_caps.adjtime = ixgbe_ptp_adjtime;
adapter->ptp_caps.gettimex64 = ixgbe_ptp_gettimex;
adapter->ptp_caps.settime64 = ixgbe_ptp_settime;
adapter->ptp_caps.enable = ixgbe_ptp_feature_enable;
- adapter->ptp_setup_sdp = NULL;
+ adapter->ptp_setup_sdp = ixgbe_ptp_setup_sdp_X550;
break;
default:
adapter->ptp_clock = NULL;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 84f2dba39e36..2be1c4c72435 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -1067,6 +1067,7 @@ struct ixgbe_nvm_version {
#define IXGBE_AUXSTMPL1 0x08C44 /* Auxiliary Time Stamp 1 register Low - RO */
#define IXGBE_AUXSTMPH1 0x08C48 /* Auxiliary Time Stamp 1 register High - RO */
#define IXGBE_TSIM 0x08C68 /* TimeSync Interrupt Mask Register - RW */
+#define IXGBE_TSSDP 0x0003C /* TimeSync SDP Configuration Register - RW */
/* Diagnostic Registers */
#define IXGBE_RDSTATCTL 0x02C20
@@ -2240,11 +2241,18 @@ enum {
#define IXGBE_RXDCTL_RLPML_EN 0x00008000
#define IXGBE_RXDCTL_VME 0x40000000 /* VLAN mode enable */
-#define IXGBE_TSAUXC_EN_CLK 0x00000004
-#define IXGBE_TSAUXC_SYNCLK 0x00000008
-#define IXGBE_TSAUXC_SDP0_INT 0x00000040
+#define IXGBE_TSAUXC_EN_CLK 0x00000004
+#define IXGBE_TSAUXC_SYNCLK 0x00000008
+#define IXGBE_TSAUXC_SDP0_INT 0x00000040
+#define IXGBE_TSAUXC_EN_TT0 0x00000001
+#define IXGBE_TSAUXC_EN_TT1 0x00000002
+#define IXGBE_TSAUXC_ST0 0x00000010
#define IXGBE_TSAUXC_DISABLE_SYSTIME 0x80000000
+#define IXGBE_TSSDP_TS_SDP0_SEL_MASK 0x000000C0
+#define IXGBE_TSSDP_TS_SDP0_CLK0 0x00000080
+#define IXGBE_TSSDP_TS_SDP0_EN 0x00000100
+
#define IXGBE_TSYNCTXCTL_VALID 0x00000001 /* Tx timestamp valid */
#define IXGBE_TSYNCTXCTL_ENABLED 0x00000010 /* Tx timestamping enabled */
--
2.21.0.564.g2d7e7e4d310b
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