From: Ederson de Souza <ederson.deso...@intel.com>
The i225 device can produce one interrupt on the full second, much
like i210 - from where this patch is inspired.
This patch sets up the full second interruption on the i225 and when
receiving it, it sends a PPS event to PTP (Precision Time Protocol)
kernel subsystem.
The PTP subsystem exposes the PPS events via ioctl and sysfs, and one
can use the `testptp` tool (tools/testing/selftests/ptp) to check that
the events are being generated.
Signed-off-by: Ederson de Souza <ederson.deso...@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbru...@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.ngu...@intel.com>
---
drivers/net/ethernet/intel/igc/igc.h | 2 ++
drivers/net/ethernet/intel/igc/igc_main.c | 8 +++++++
drivers/net/ethernet/intel/igc/igc_ptp.c | 28 ++++++++++++++++++++++-
3 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igc/igc.h
b/drivers/net/ethernet/intel/igc/igc.h
index 91493a73355d..7c404c2daa47 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -223,6 +223,8 @@ struct igc_adapter {
char fw_version[32];
struct bpf_prog *xdp_prog;
+
+ bool pps_sys_wrap_on;
};
void igc_up(struct igc_adapter *adapter);
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c
b/drivers/net/ethernet/intel/igc/igc_main.c
index 10765491e357..ac93c0e1b618 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -4251,9 +4251,17 @@ igc_features_check(struct sk_buff *skb, struct
net_device *dev,
static void igc_tsync_interrupt(struct igc_adapter *adapter)
{
struct igc_hw *hw = &adapter->hw;
+ struct ptp_clock_event event;
u32 tsicr = rd32(IGC_TSICR);
u32 ack = 0;
+ if (tsicr & IGC_TSICR_SYS_WRAP) {
+ event.type = PTP_CLOCK_PPS;
+ if (adapter->ptp_caps.pps)
+ ptp_clock_event(adapter->ptp_clock, &event);
+ ack |= IGC_TSICR_SYS_WRAP;
+ }
+
if (tsicr & IGC_TSICR_TXTS) {
/* retrieve hardware timestamp */
schedule_work(&adapter->ptp_tx_work);
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c
b/drivers/net/ethernet/intel/igc/igc_ptp.c
index dfa3b247fcd8..8d6fbf609761 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -123,6 +123,29 @@ static int igc_ptp_settime_i225(struct ptp_clock_info *ptp,
static int igc_ptp_feature_enable_i225(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
+ struct igc_adapter *igc =
+ container_of(ptp, struct igc_adapter, ptp_caps);
+ struct igc_hw *hw = &igc->hw;
+ unsigned long flags;
+ u32 tsim;
+
+ switch (rq->type) {
+ case PTP_CLK_REQ_PPS:
+ spin_lock_irqsave(&igc->tmreg_lock, flags);
+ tsim = rd32(IGC_TSIM);
+ if (on)
+ tsim |= IGC_TSICR_SYS_WRAP;
+ else
+ tsim &= ~IGC_TSICR_SYS_WRAP;
+ igc->pps_sys_wrap_on = on;
+ wr32(IGC_TSIM, tsim);
+ spin_unlock_irqrestore(&igc->tmreg_lock, flags);
+ return 0;
+
+ default:
+ break;
+ }
+
return -EOPNOTSUPP;
}
@@ -497,6 +520,7 @@ void igc_ptp_init(struct igc_adapter *adapter)
adapter->ptp_caps.gettimex64 = igc_ptp_gettimex64_i225;
adapter->ptp_caps.settime64 = igc_ptp_settime_i225;
adapter->ptp_caps.enable = igc_ptp_feature_enable_i225;
+ adapter->ptp_caps.pps = 1;
break;
default:
adapter->ptp_clock = NULL;
@@ -598,7 +622,9 @@ void igc_ptp_reset(struct igc_adapter *adapter)
case igc_i225:
wr32(IGC_TSAUXC, 0x0);
wr32(IGC_TSSDP, 0x0);
- wr32(IGC_TSIM, IGC_TSICR_INTERRUPTS);
+ wr32(IGC_TSIM,
+ IGC_TSICR_INTERRUPTS |
+ (adapter->pps_sys_wrap_on ? IGC_TSICR_SYS_WRAP : 0));
wr32(IGC_IMS, IGC_IMS_TS);
break;
default:
--
2.26.2
