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authorRichard Cochran <richardcochran@gmail.com>2015-07-24 00:59:30 +0300
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2015-08-19 00:06:04 +0300
commit30c72916d71b7970b16dca2bb1234aef2d37b695 (patch)
tree95b35c9485775cd48c26692e9b13235b21b0a6c0 /drivers/net/ethernet/intel/igb/igb_ptp.c
parent6423fc34160939142d72ffeaa2db6408317f54df (diff)
downloadlinux-30c72916d71b7970b16dca2bb1234aef2d37b695.tar.xz
igb: implement high frequency periodic output signals
In addition to interrupt driven target time output events, the i210 also has two programmable clock outputs. These clocks support periods between 16 nanoseconds and 140 milliseconds. This patch implements the periodic output function using the clock outputs when possible, falling back to the target time for longer periods. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/igb/igb_ptp.c')
-rw-r--r--drivers/net/ethernet/intel/igb/igb_ptp.c72
1 files changed, 52 insertions, 20 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index c3a9392cbc19..5982f28d521a 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -405,7 +405,7 @@ static void igb_pin_extts(struct igb_adapter *igb, int chan, int pin)
wr32(E1000_CTRL_EXT, ctrl_ext);
}
-static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin)
+static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin, int freq)
{
static const u32 aux0_sel_sdp[IGB_N_SDP] = {
AUX0_SEL_SDP0, AUX0_SEL_SDP1, AUX0_SEL_SDP2, AUX0_SEL_SDP3,
@@ -424,6 +424,14 @@ static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin)
TS_SDP0_SEL_TT1, TS_SDP1_SEL_TT1,
TS_SDP2_SEL_TT1, TS_SDP3_SEL_TT1,
};
+ static const u32 ts_sdp_sel_fc0[IGB_N_SDP] = {
+ TS_SDP0_SEL_FC0, TS_SDP1_SEL_FC0,
+ TS_SDP2_SEL_FC0, TS_SDP3_SEL_FC0,
+ };
+ static const u32 ts_sdp_sel_fc1[IGB_N_SDP] = {
+ TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
+ TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
+ };
static const u32 ts_sdp_sel_clr[IGB_N_SDP] = {
TS_SDP0_SEL_FC1, TS_SDP1_SEL_FC1,
TS_SDP2_SEL_FC1, TS_SDP3_SEL_FC1,
@@ -445,11 +453,17 @@ static void igb_pin_perout(struct igb_adapter *igb, int chan, int pin)
tssdp &= ~AUX1_TS_SDP_EN;
tssdp &= ~ts_sdp_sel_clr[pin];
- if (chan == 1)
- tssdp |= ts_sdp_sel_tt1[pin];
- else
- tssdp |= ts_sdp_sel_tt0[pin];
-
+ if (freq) {
+ if (chan == 1)
+ tssdp |= ts_sdp_sel_fc1[pin];
+ else
+ tssdp |= ts_sdp_sel_fc0[pin];
+ } else {
+ if (chan == 1)
+ tssdp |= ts_sdp_sel_tt1[pin];
+ else
+ tssdp |= ts_sdp_sel_tt0[pin];
+ }
tssdp |= ts_sdp_en[pin];
wr32(E1000_TSSDP, tssdp);
@@ -463,10 +477,10 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
struct igb_adapter *igb =
container_of(ptp, struct igb_adapter, ptp_caps);
struct e1000_hw *hw = &igb->hw;
- u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh;
+ u32 tsauxc, tsim, tsauxc_mask, tsim_mask, trgttiml, trgttimh, freqout;
unsigned long flags;
struct timespec ts;
- int pin = -1;
+ int use_freq = 0, pin = -1;
s64 ns;
switch (rq->type) {
@@ -511,40 +525,58 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
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;
+ if (on && ns <= 70000000LL) {
+ if (ns < 8LL)
+ return -EINVAL;
+ use_freq = 1;
}
ts = ns_to_timespec(ns);
if (rq->perout.index == 1) {
- tsauxc_mask = TSAUXC_EN_TT1;
- tsim_mask = TSINTR_TT1;
+ if (use_freq) {
+ tsauxc_mask = TSAUXC_EN_CLK1 | TSAUXC_ST1;
+ tsim_mask = 0;
+ } else {
+ tsauxc_mask = TSAUXC_EN_TT1;
+ tsim_mask = TSINTR_TT1;
+ }
trgttiml = E1000_TRGTTIML1;
trgttimh = E1000_TRGTTIMH1;
+ freqout = E1000_FREQOUT1;
} else {
- tsauxc_mask = TSAUXC_EN_TT0;
- tsim_mask = TSINTR_TT0;
+ if (use_freq) {
+ tsauxc_mask = TSAUXC_EN_CLK0 | TSAUXC_ST0;
+ tsim_mask = 0;
+ } else {
+ tsauxc_mask = TSAUXC_EN_TT0;
+ tsim_mask = TSINTR_TT0;
+ }
trgttiml = E1000_TRGTTIML0;
trgttimh = E1000_TRGTTIMH0;
+ freqout = E1000_FREQOUT0;
}
spin_lock_irqsave(&igb->tmreg_lock, flags);
tsauxc = rd32(E1000_TSAUXC);
tsim = rd32(E1000_TSIM);
+ if (rq->perout.index == 1) {
+ tsauxc &= ~(TSAUXC_EN_TT1 | TSAUXC_EN_CLK1 | TSAUXC_ST1);
+ tsim &= ~TSINTR_TT1;
+ } else {
+ tsauxc &= ~(TSAUXC_EN_TT0 | TSAUXC_EN_CLK0 | TSAUXC_ST0);
+ tsim &= ~TSINTR_TT0;
+ }
if (on) {
int i = rq->perout.index;
-
- igb_pin_perout(igb, i, pin);
+ igb_pin_perout(igb, i, pin, use_freq);
igb->perout[i].start.tv_sec = rq->perout.start.sec;
igb->perout[i].start.tv_nsec = rq->perout.start.nsec;
igb->perout[i].period.tv_sec = ts.tv_sec;
igb->perout[i].period.tv_nsec = ts.tv_nsec;
wr32(trgttimh, rq->perout.start.sec);
wr32(trgttiml, rq->perout.start.nsec);
+ if (use_freq)
+ wr32(freqout, ns);
tsauxc |= tsauxc_mask;
tsim |= tsim_mask;
- } else {
- tsauxc &= ~tsauxc_mask;
- tsim &= ~tsim_mask;
}
wr32(E1000_TSAUXC, tsauxc);
wr32(E1000_TSIM, tsim);