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Date: Tue, 25 Jan 2022 23:40:11 -0500
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
pavan.chebbi@...adcom.com,
Richard Cochran <richardcochran@...il.com>
Subject: [PATCH net-next 3/5] bnxt_en: Add driver support to use Real Time Counter for PTP
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
Add support for RTC mode if it is supported by firmware. In RTC
mode, the PHC is set to the 64-bit clock. Because the legacy interface
is 48-bit, the driver still has to keep track of the upper 16 bits and
handle the rollover.
Cc: Richard Cochran <richardcochran@...il.com>
Reviewed-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 7 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 +
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 73 ++++++++++++++++++-
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 4 +-
4 files changed, 79 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 4f94136a011a..514798a4f15b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7414,6 +7414,7 @@ static int __bnxt_hwrm_ptp_qcfg(struct bnxt *bp)
struct hwrm_port_mac_ptp_qcfg_output *resp;
struct hwrm_port_mac_ptp_qcfg_input *req;
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
+ bool phc_cfg;
u8 flags;
int rc;
@@ -7456,7 +7457,8 @@ static int __bnxt_hwrm_ptp_qcfg(struct bnxt *bp)
rc = -ENODEV;
goto exit;
}
- rc = bnxt_ptp_init(bp);
+ phc_cfg = (flags & PORT_MAC_PTP_QCFG_RESP_FLAGS_RTC_CONFIGURED) != 0;
+ rc = bnxt_ptp_init(bp, phc_cfg);
if (rc)
netdev_warn(bp->dev, "PTP initialization failed.\n");
exit:
@@ -7514,6 +7516,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
bp->fw_cap |= BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED;
if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_PPS_SUPPORTED))
bp->fw_cap |= BNXT_FW_CAP_PTP_PPS;
+ if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_64BIT_RTC_SUPPORTED)
+ bp->fw_cap |= BNXT_FW_CAP_PTP_RTC;
if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_HOT_RESET_IF_SUPPORT))
bp->fw_cap |= BNXT_FW_CAP_HOT_RESET_IF;
if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_FW_LIVEPATCH_SUPPORTED))
@@ -10288,6 +10292,7 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
/* VF-reps may need to be re-opened after the PF is re-opened */
if (BNXT_PF(bp))
bnxt_vf_reps_open(bp);
+ bnxt_ptp_init_rtc(bp, true);
return 0;
open_err_irq:
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 440dfeb4948b..4b023e35c765 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1957,6 +1957,7 @@ struct bnxt {
#define BNXT_FW_CAP_EXT_STATS_SUPPORTED 0x00040000
#define BNXT_FW_CAP_ERR_RECOVER_RELOAD 0x00100000
#define BNXT_FW_CAP_HOT_RESET 0x00200000
+ #define BNXT_FW_CAP_PTP_RTC 0x00400000
#define BNXT_FW_CAP_VLAN_RX_STRIP 0x01000000
#define BNXT_FW_CAP_VLAN_TX_INSERT 0x02000000
#define BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED 0x04000000
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index 921aa7f75c9a..066e5a9bb29e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
@@ -19,6 +19,20 @@
#include "bnxt_hwrm.h"
#include "bnxt_ptp.h"
+static int bnxt_ptp_cfg_settime(struct bnxt *bp, u64 time)
+{
+ struct hwrm_func_ptp_cfg_input *req;
+ int rc;
+
+ rc = hwrm_req_init(bp, req, HWRM_FUNC_PTP_CFG);
+ if (rc)
+ return rc;
+
+ req->enables = cpu_to_le16(FUNC_PTP_CFG_REQ_ENABLES_PTP_SET_TIME);
+ req->ptp_set_time = cpu_to_le64(time);
+ return hwrm_req_send(bp, req);
+}
+
int bnxt_ptp_parse(struct sk_buff *skb, u16 *seq_id, u16 *hdr_off)
{
unsigned int ptp_class;
@@ -48,6 +62,9 @@ static int bnxt_ptp_settime(struct ptp_clock_info *ptp_info,
ptp_info);
u64 ns = timespec64_to_ns(ts);
+ if (ptp->bp->fw_cap & BNXT_FW_CAP_PTP_RTC)
+ return bnxt_ptp_cfg_settime(ptp->bp, ns);
+
spin_lock_bh(&ptp->ptp_lock);
timecounter_init(&ptp->tc, &ptp->cc, ns);
spin_unlock_bh(&ptp->ptp_lock);
@@ -730,6 +747,41 @@ static void bnxt_ptp_timecounter_init(struct bnxt *bp, bool init_tc)
timecounter_init(&ptp->tc, &ptp->cc, ktime_to_ns(ktime_get_real()));
}
+/* Caller holds ptp_lock */
+void bnxt_ptp_rtc_timecounter_init(struct bnxt_ptp_cfg *ptp, u64 ns)
+{
+ timecounter_init(&ptp->tc, &ptp->cc, ns);
+ /* For RTC, cycle_last must be in sync with the timecounter value. */
+ ptp->tc.cycle_last = ns & ptp->cc.mask;
+}
+
+int bnxt_ptp_init_rtc(struct bnxt *bp, bool phc_cfg)
+{
+ struct timespec64 tsp;
+ u64 ns;
+ int rc;
+
+ if (!bp->ptp_cfg || !(bp->fw_cap & BNXT_FW_CAP_PTP_RTC))
+ return -ENODEV;
+
+ if (!phc_cfg) {
+ ktime_get_real_ts64(&tsp);
+ ns = timespec64_to_ns(&tsp);
+ rc = bnxt_ptp_cfg_settime(bp, ns);
+ if (rc)
+ return rc;
+ } else {
+ rc = bnxt_hwrm_port_ts_query(bp, PORT_TS_QUERY_REQ_FLAGS_CURRENT_TIME, &ns);
+ if (rc)
+ return rc;
+ }
+ spin_lock_bh(&bp->ptp_cfg->ptp_lock);
+ bnxt_ptp_rtc_timecounter_init(bp->ptp_cfg, ns);
+ spin_unlock_bh(&bp->ptp_cfg->ptp_lock);
+
+ return 0;
+}
+
static void bnxt_ptp_free(struct bnxt *bp)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
@@ -742,7 +794,7 @@ static void bnxt_ptp_free(struct bnxt *bp)
}
}
-int bnxt_ptp_init(struct bnxt *bp)
+int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg)
{
struct bnxt_ptp_cfg *ptp = bp->ptp_cfg;
int rc;
@@ -754,6 +806,13 @@ int bnxt_ptp_init(struct bnxt *bp)
if (rc)
return rc;
+ if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC) {
+ bnxt_ptp_timecounter_init(bp, false);
+ rc = bnxt_ptp_init_rtc(bp, phc_cfg);
+ if (rc)
+ goto out;
+ }
+
if (ptp->ptp_clock && bnxt_pps_config_ok(bp))
return 0;
@@ -762,7 +821,8 @@ int bnxt_ptp_init(struct bnxt *bp)
atomic_set(&ptp->tx_avail, BNXT_MAX_TX_TS);
spin_lock_init(&ptp->ptp_lock);
- bnxt_ptp_timecounter_init(bp, true);
+ if (!(bp->fw_cap & BNXT_FW_CAP_PTP_RTC))
+ bnxt_ptp_timecounter_init(bp, true);
ptp->ptp_info = bnxt_ptp_caps;
if ((bp->fw_cap & BNXT_FW_CAP_PTP_PPS)) {
@@ -774,8 +834,8 @@ int bnxt_ptp_init(struct bnxt *bp)
int err = PTR_ERR(ptp->ptp_clock);
ptp->ptp_clock = NULL;
- bnxt_unmap_ptp_regs(bp);
- return err;
+ rc = err;
+ goto out;
}
if (bp->flags & BNXT_FLAG_CHIP_P5) {
spin_lock_bh(&ptp->ptp_lock);
@@ -785,6 +845,11 @@ int bnxt_ptp_init(struct bnxt *bp)
ptp_schedule_worker(ptp->ptp_clock, 0);
}
return 0;
+
+out:
+ bnxt_ptp_free(bp);
+ bnxt_unmap_ptp_regs(bp);
+ return rc;
}
void bnxt_ptp_clear(struct bnxt *bp)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
index 7c528e1f8713..ca850c5f0607 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h
@@ -137,6 +137,8 @@ int bnxt_hwtstamp_set(struct net_device *dev, struct ifreq *ifr);
int bnxt_hwtstamp_get(struct net_device *dev, struct ifreq *ifr);
int bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb);
int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 *ts, u32 pkt_ts);
-int bnxt_ptp_init(struct bnxt *bp);
+void bnxt_ptp_rtc_timecounter_init(struct bnxt_ptp_cfg *ptp, u64 ns);
+int bnxt_ptp_init_rtc(struct bnxt *bp, bool phc_cfg);
+int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg);
void bnxt_ptp_clear(struct bnxt *bp);
#endif
--
2.18.1
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