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Subject[PATCH 3/6] net: ethernet: ti: cpts: add support of cpts HW_TS_PUSH
Date
This patch adds support of the CPTS HW_TS_PUSH events which are generated
by external low frequency time stamp channels on TI's OMAP CPSW and
Keystone 2 platforms. It supports up to 8 external time stamp channels for
HW_TS_PUSH input pins (the number of supported channel is different for
different SoCs and CPTS versions, check corresponding Data maual before
enabling it). Therefore, new DT property "cpts-ext-ts-inputs" is introduced
for specifying number of available external timestamp channels.

The PTP external timestamp (extts) infrastructure can be used for
HW_TS_PUSH timestamp controlling and reporting.

This also change overflow polling period when HW_TS_PUSH feature is
enabled - overflow check work will be scheduled more often (every
200ms) for proper HW_TS_PUSH events reporting.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
Documentation/devicetree/bindings/net/cpsw.txt | 4 +
.../devicetree/bindings/net/keystone-netcp.txt | 4 +
drivers/net/ethernet/ti/cpts.c | 104 ++++++++++++++++++++-
drivers/net/ethernet/ti/cpts.h | 6 ++
4 files changed, 114 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index ebda7c9..86a2f61 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -38,6 +38,10 @@ Optional properties:
Mult and shift will be calculated basing on CPTS
rftclk frequency if both cpts_clock_shift and
cpts_clock_mult properties are not provided.
+- cpts-ext-ts-inputs : The number of external time stamp channels.
+ The different CPTS versions might support up 8
+ external time stamp channels.
+ if absent - unsupported.

Slave Properties:
Required properties:
diff --git a/Documentation/devicetree/bindings/net/keystone-netcp.txt b/Documentation/devicetree/bindings/net/keystone-netcp.txt
index ec4a241..1c805319 100644
--- a/Documentation/devicetree/bindings/net/keystone-netcp.txt
+++ b/Documentation/devicetree/bindings/net/keystone-netcp.txt
@@ -123,6 +123,10 @@ Optional properties:

Defaults: clock_mult, clock_shift = calculated from
CPTS refclk
+ - cpts-ext-ts-inputs:
+ The number of external time stamp channels.
+ The different CPTS versions might support up 8
+ external time stamp channels. if absent - unsupported.

NetCP interface properties: Interface specification for NetCP sub-modules.
Required properties:
diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index 9c5b835..2f7641a 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -34,6 +34,11 @@
#define cpts_read32(c, r) readl_relaxed(&c->reg->r)
#define cpts_write32(c, v, r) writel_relaxed(v, &c->reg->r)

+static int cpts_event_port(struct cpts_event *event)
+{
+ return (event->high >> PORT_NUMBER_SHIFT) & PORT_NUMBER_MASK;
+}
+
static int event_expired(struct cpts_event *event)
{
return time_after(jiffies, event->tmo);
@@ -96,11 +101,15 @@ static int cpts_fifo_read(struct cpts *cpts, int match)
}

event = list_first_entry(&cpts->pool, struct cpts_event, list);
- event->tmo = jiffies + 2;
+ event->tmo = jiffies +
+ msecs_to_jiffies(CPTS_EVENT_RX_TX_TIMEOUT);
event->high = hi;
event->low = lo;
type = event_type(event);
switch (type) {
+ case CPTS_EV_HW:
+ event->tmo +=
+ msecs_to_jiffies(CPTS_EVENT_HWSTAMP_TIMEOUT);
case CPTS_EV_PUSH:
case CPTS_EV_RX:
case CPTS_EV_TX:
@@ -109,7 +118,6 @@ static int cpts_fifo_read(struct cpts *cpts, int match)
break;
case CPTS_EV_ROLL:
case CPTS_EV_HALF:
- case CPTS_EV_HW:
break;
default:
pr_err("cpts: unknown event type\n");
@@ -218,9 +226,83 @@ static int cpts_ptp_settime(struct ptp_clock_info *ptp,
return 0;
}

+static int cpts_report_ts_events(struct cpts *cpts)
+{
+ struct list_head *this, *next;
+ struct ptp_clock_event pevent;
+ struct cpts_event *event;
+ int reported = 0, ev;
+
+ list_for_each_safe(this, next, &cpts->events) {
+ event = list_entry(this, struct cpts_event, list);
+ ev = event_type(event);
+ if (ev == CPTS_EV_HW) {
+ list_del_init(&event->list);
+ list_add(&event->list, &cpts->pool);
+ /* report the event */
+ pevent.timestamp =
+ timecounter_cyc2time(&cpts->tc, event->low);
+ pevent.type = PTP_CLOCK_EXTTS;
+ pevent.index = cpts_event_port(event) - 1;
+ ptp_clock_event(cpts->clock, &pevent);
+ ++reported;
+ continue;
+ }
+ }
+ return reported;
+}
+
+/* HW TS */
+static int cpts_extts_enable(struct cpts *cpts, u32 index, int on)
+{
+ unsigned long flags;
+ u32 v;
+
+ if (index >= cpts->info.n_ext_ts)
+ return -ENXIO;
+
+ if (((cpts->hw_ts_enable & BIT(index)) >> index) == on)
+ return 0;
+
+ spin_lock_irqsave(&cpts->lock, flags);
+
+ v = cpts_read32(cpts, control);
+ if (on) {
+ v |= BIT(8 + index);
+ cpts->hw_ts_enable |= BIT(index);
+ } else {
+ v &= ~BIT(8 + index);
+ cpts->hw_ts_enable &= ~BIT(index);
+ }
+ cpts_write32(cpts, v, control);
+
+ spin_unlock_irqrestore(&cpts->lock, flags);
+
+ if (cpts->hw_ts_enable)
+ /* poll for events faster - evry 200 ms */
+ cpts->ov_check_period =
+ msecs_to_jiffies(CPTS_EVENT_HWSTAMP_TIMEOUT);
+ else
+ cpts->ov_check_period = cpts->ov_check_period_slow;
+
+ mod_delayed_work(system_wq, &cpts->overflow_work,
+ cpts->ov_check_period);
+
+ return 0;
+}
+
static int cpts_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
+ struct cpts *cpts = container_of(ptp, struct cpts, info);
+
+ switch (rq->type) {
+ case PTP_CLK_REQ_EXTTS:
+ return cpts_extts_enable(cpts, rq->extts.index, on);
+ default:
+ break;
+ }
+
return -EOPNOTSUPP;
}

@@ -240,10 +322,16 @@ static struct ptp_clock_info cpts_info = {

static void cpts_overflow_check(struct work_struct *work)
{
- struct timespec64 ts;
struct cpts *cpts = container_of(work, struct cpts, overflow_work.work);
+ struct timespec64 ts;
+ unsigned long flags;

- cpts_ptp_gettime(&cpts->info, &ts);
+ spin_lock_irqsave(&cpts->lock, flags);
+ ts = ns_to_timespec64(timecounter_read(&cpts->tc));
+ spin_unlock_irqrestore(&cpts->lock, flags);
+
+ if (cpts->hw_ts_enable)
+ cpts_report_ts_events(cpts);
pr_debug("cpts overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);
schedule_delayed_work(&cpts->overflow_work, cpts->ov_check_period);
}
@@ -422,6 +510,8 @@ static void cpts_calc_mult_shift(struct cpts *cpts)

/* Calc overflow check period (maxsec / 2) */
cpts->ov_check_period = (HZ * maxsec) / 2;
+ cpts->ov_check_period_slow = cpts->ov_check_period;
+
dev_info(cpts->dev, "cpts: overflow check period %lu (jiffies)\n",
cpts->ov_check_period);

@@ -468,6 +558,9 @@ static int cpts_of_parse(struct cpts *cpts, struct device_node *node)
cpts->rftclk_sel = prop & CPTS_RFTCLK_SEL_MASK;
}

+ if (!of_property_read_u32(node, "cpts-ext-ts-inputs", &prop))
+ cpts->ext_ts_inputs = prop;
+
return 0;

of_error:
@@ -512,6 +605,9 @@ struct cpts *cpts_create(struct device *dev, void __iomem *regs,
cpts->cc.mask = CLOCKSOURCE_MASK(32);
cpts->info = cpts_info;

+ if (cpts->ext_ts_inputs)
+ cpts->info.n_ext_ts = cpts->ext_ts_inputs;
+
cpts_calc_mult_shift(cpts);

return cpts;
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index c934b61..ad80c95 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -102,6 +102,9 @@ enum {
#define CPTS_FIFO_DEPTH 16
#define CPTS_MAX_EVENTS 32

+#define CPTS_EVENT_RX_TX_TIMEOUT 20 /* ms */
+#define CPTS_EVENT_HWSTAMP_TIMEOUT 200 /* ms */
+
struct cpts_event {
struct list_head list;
unsigned long tmo;
@@ -129,7 +132,10 @@ struct cpts {
struct list_head pool;
struct cpts_event pool_data[CPTS_MAX_EVENTS];
unsigned long ov_check_period;
+ unsigned long ov_check_period_slow;
u32 rftclk_sel;
+ u32 ext_ts_inputs;
+ u32 hw_ts_enable;
u32 caps;
};

--
2.10.1
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