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Date: Mon, 27 May 2013 11:21:45 +0200
From: Richard Cochran <richardcochran@...il.com>
To: <netdev@...r.kernel.org>
Cc: David Miller <davem@...emloft.net>,
<e1000-devel@...ts.sourceforge.net>,
Jacob Keller <jacob.e.keller@...el.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Matthew Vick <matthew.vick@...el.com>
Subject: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for the i210.
The i210 device offers a number of special PTP Hardware Clock features on
the Software Defined Pins (SDPs). This patch adds support for three of the
possible functions, namely time stamping external events, a periodic
output signal, and an internal PPS event for adjusting the kernel system
time.
A pair of module parameters lets the user choose which of the four SDPs
will be used as the input signal and which as the output.
Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
drivers/net/ethernet/intel/igb/igb.h | 2 +
drivers/net/ethernet/intel/igb/igb_main.c | 30 ++++++
drivers/net/ethernet/intel/igb/igb_ptp.c | 157 ++++++++++++++++++++++++++++-
3 files changed, 188 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 15ea8dc..802b79c 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -435,6 +435,8 @@ struct igb_adapter {
struct timecounter tc;
u32 tx_hwtstamp_timeouts;
u32 rx_hwtstamp_cleared;
+ struct timespec start;
+ struct timespec period;
char fw_version[32];
#ifdef CONFIG_IGB_HWMON
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index d25a965..58120cd 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -5038,12 +5038,42 @@ void igb_update_stats(struct igb_adapter *adapter,
static void igb_tsync_interrupt(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
+ struct ptp_clock_event event;
u32 tsicr = rd32(E1000_TSICR);
+ if (tsicr & TSINTR_SYS_WRAP) {
+ event.type = PTP_CLOCK_PPS;
+ ptp_clock_event(adapter->ptp_clock, &event);
+ }
+
if (tsicr & E1000_TSICR_TXTS) {
/* retrieve hardware timestamp */
schedule_work(&adapter->ptp_tx_work);
}
+
+ if (tsicr & TSINTR_TT0) {
+ struct timespec ts;
+ u32 tsauxc;
+ spin_lock(&adapter->tmreg_lock);
+ ts = timespec_add(adapter->start, adapter->period);
+ wr32(E1000_TRGTTIML0, ts.tv_nsec);
+ wr32(E1000_TRGTTIMH0, ts.tv_sec);
+ tsauxc = rd32(E1000_TSAUXC);
+ tsauxc |= TSAUXC_EN_TT0;
+ wr32(E1000_TSAUXC, tsauxc);
+ adapter->start = ts;
+ spin_unlock(&adapter->tmreg_lock);
+ }
+
+ if (tsicr & TSINTR_AUTT0) {
+ u32 sec, nsec;
+ nsec = rd32(E1000_AUXSTMPL0);
+ sec = rd32(E1000_AUXSTMPH0);
+ event.type = PTP_CLOCK_EXTTS;
+ event.index = 0;
+ event.timestamp = sec * 1000000000ULL + nsec;
+ ptp_clock_event(adapter->ptp_clock, &event);
+ }
}
static irqreturn_t igb_msix_other(int irq, void *data)
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 5944de0..8cf4b8a 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -23,6 +23,15 @@
#include "igb.h"
+static int igb_input_sdp = 0;
+static int igb_output_sdp = 1;
+module_param(igb_input_sdp, int, 0444);
+module_param(igb_output_sdp, int, 0444);
+MODULE_PARM_DESC(igb_input_sdp,
+ "The SDP used as an input, to time stamp external events");
+MODULE_PARM_DESC(igb_output_sdp,
+ "The SDP used to output the programmable periodic signal");
+
#define INCVALUE_MASK 0x7fffffff
#define ISGN 0x80000000
@@ -359,6 +368,86 @@ static int igb_ptp_settime_i210(struct ptp_clock_info *ptp,
return 0;
}
+static int igb_ptp_enable_i210(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *rq, int on)
+{
+ struct igb_adapter *igb = container_of(ptp, struct igb_adapter,
+ ptp_caps);
+ struct e1000_hw *hw = &igb->hw;
+ unsigned long flags;
+ struct timespec ts;
+ u32 tsauxc, tsim;
+ s64 ns;
+
+ switch (rq->type) {
+ case PTP_CLK_REQ_EXTTS:
+ if (rq->extts.index != 0)
+ return -EINVAL;
+ spin_lock_irqsave(&igb->tmreg_lock, flags);
+ tsauxc = rd32(E1000_TSAUXC);
+ tsim = rd32(E1000_TSIM);
+ if (on) {
+ tsauxc |= TSAUXC_EN_TS0;
+ tsim |= TSINTR_AUTT0;
+ } else {
+ tsauxc &= ~TSAUXC_EN_TS0;
+ tsim &= ~TSINTR_AUTT0;
+ }
+ wr32(E1000_TSAUXC, tsauxc);
+ wr32(E1000_TSIM, tsim);
+ spin_unlock_irqrestore(&igb->tmreg_lock, flags);
+ return 0;
+
+ case PTP_CLK_REQ_PEROUT:
+ if (rq->perout.index != 0)
+ return -EINVAL;
+
+ ts.tv_sec = rq->perout.period.sec;
+ ts.tv_nsec = rq->perout.period.nsec;
+ ns = timespec_to_ns(&ts);
+ ns = ns >> 1;
+ if (on && ns < 500000LL) {
+ /* 2k interrupts per second is an awful lot. */
+ return -EINVAL;
+ }
+ ts = ns_to_timespec(ns);
+
+ spin_lock_irqsave(&igb->tmreg_lock, flags);
+ tsauxc = rd32(E1000_TSAUXC);
+ tsim = rd32(E1000_TSIM);
+ if (on) {
+ igb->start.tv_sec = rq->perout.start.sec;
+ igb->start.tv_nsec = rq->perout.start.nsec;
+ igb->period.tv_sec = ts.tv_sec;
+ igb->period.tv_nsec = ts.tv_nsec;
+ wr32(E1000_TRGTTIML0, rq->perout.start.sec);
+ wr32(E1000_TRGTTIMH0, rq->perout.start.nsec);
+ tsauxc |= TSAUXC_EN_TT0;
+ tsim |= TSINTR_TT0;
+ } else {
+ tsauxc &= ~TSAUXC_EN_TT0;
+ tsim &= ~TSINTR_TT0;
+ }
+ wr32(E1000_TSAUXC, tsauxc);
+ wr32(E1000_TSIM, tsim);
+ spin_unlock_irqrestore(&igb->tmreg_lock, flags);
+ return 0;
+
+ case PTP_CLK_REQ_PPS:
+ spin_lock_irqsave(&igb->tmreg_lock, flags);
+ tsim = rd32(E1000_TSIM);
+ if (on)
+ tsim |= TSINTR_SYS_WRAP;
+ else
+ tsim &= ~TSINTR_SYS_WRAP;
+ wr32(E1000_TSIM, tsim);
+ spin_unlock_irqrestore(&igb->tmreg_lock, flags);
+ return 0;
+ }
+
+ return -EOPNOTSUPP;
+}
+
static int igb_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
@@ -711,6 +800,68 @@ int igb_ptp_hwtstamp_ioctl(struct net_device *netdev,
-EFAULT : 0;
}
+static int igb_sdp_init(struct igb_adapter *adapter)
+{
+ struct e1000_hw *hw = &adapter->hw;
+ u32 ctrl, ctrl_ext, tssdp = 0;
+
+ if (igb_input_sdp == igb_output_sdp) {
+ pr_err("SDP %d set as both input and output\n", igb_input_sdp);
+ return -1;
+ }
+
+ ctrl = rd32(E1000_CTRL);
+ ctrl_ext = rd32(E1000_CTRL_EXT);
+
+ switch (igb_input_sdp) {
+ case 0:
+ tssdp |= AUX0_TS_SDP_EN | AUX0_SEL_SDP0;
+ ctrl &= ~E1000_CTRL_SDP0_DIR;
+ break;
+ case 1:
+ tssdp |= AUX0_TS_SDP_EN | AUX0_SEL_SDP1;
+ ctrl &= ~E1000_CTRL_SDP1_DIR;
+ break;
+ case 2:
+ tssdp |= AUX0_TS_SDP_EN | AUX0_SEL_SDP2;
+ ctrl_ext &= ~E1000_CTRL_EXT_SDP2_DIR;
+ break;
+ case 3:
+ tssdp |= AUX0_TS_SDP_EN | AUX0_SEL_SDP3;
+ ctrl_ext &= ~E1000_CTRL_EXT_SDP3_DIR;
+ break;
+ default:
+ pr_err("Input SDP %d out of range\n", igb_input_sdp);
+ }
+
+ switch (igb_output_sdp) {
+ case 0:
+ tssdp |= TS_SDP0_SEL_TT0 | TS_SDP0_EN;
+ ctrl |= E1000_CTRL_SDP0_DIR;
+ break;
+ case 1:
+ tssdp |= TS_SDP1_SEL_TT0 | TS_SDP1_EN;
+ ctrl |= E1000_CTRL_SDP1_DIR;
+ break;
+ case 2:
+ tssdp |= TS_SDP2_SEL_TT0 | TS_SDP2_EN;
+ ctrl_ext |= E1000_CTRL_EXT_SDP2_DIR;
+ break;
+ case 3:
+ tssdp |= TS_SDP3_SEL_TT0 | TS_SDP3_EN;
+ ctrl_ext |= E1000_CTRL_EXT_SDP3_DIR;
+ break;
+ default:
+ pr_err("Output SDP %d out of range\n", igb_output_sdp);
+ }
+
+ wr32(E1000_TSSDP, tssdp);
+ wr32(E1000_CTRL, ctrl);
+ wr32(E1000_CTRL_EXT, ctrl_ext);
+
+ return 0;
+}
+
void igb_ptp_init(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
@@ -766,7 +917,7 @@ void igb_ptp_init(struct igb_adapter *adapter)
adapter->ptp_caps.adjtime = igb_ptp_adjtime_i210;
adapter->ptp_caps.gettime = igb_ptp_gettime_i210;
adapter->ptp_caps.settime = igb_ptp_settime_i210;
- adapter->ptp_caps.enable = igb_ptp_enable;
+ adapter->ptp_caps.enable = igb_ptp_enable_i210;
/* Enable the timer functions by clearing bit 31. */
wr32(E1000_TSAUXC, 0x0);
break;
@@ -785,6 +936,10 @@ void igb_ptp_init(struct igb_adapter *adapter)
struct timespec ts = ktime_to_timespec(ktime_get_real());
igb_ptp_settime_i210(&adapter->ptp_caps, &ts);
+ igb_sdp_init(adapter);
+ adapter->ptp_caps.n_ext_ts = 1;
+ adapter->ptp_caps.n_per_out = 1;
+ adapter->ptp_caps.pps = 1;
} else {
timecounter_init(&adapter->tc, &adapter->cc,
ktime_to_ns(ktime_get_real()));
--
1.7.10.4
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