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Date: Tue, 13 Jun 2017 18:16:22 -0500
From: Grygorii Strashko <grygorii.strashko@...com>
To: "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
Sekhar Nori <nsekhar@...com>,
Richard Cochran <richardcochran@...il.com>
CC: <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<ivan.khoronzhuk@...aro.org>,
Grygorii Strashko <grygorii.strashko@...com>
Subject: [RFC/RFT PATCH 3/4] net: ethernet: ti: cpts: add support of cpts HW_TS_PUSH
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.
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
Documentation/devicetree/bindings/net/cpsw.txt | 4 ++
.../devicetree/bindings/net/keystone-netcp.txt | 6 +++
drivers/net/ethernet/ti/cpts.c | 57 +++++++++++++++++++++-
drivers/net/ethernet/ti/cpts.h | 4 ++
4 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/cpsw.txt b/Documentation/devicetree/bindings/net/cpsw.txt
index 7cc15c9..7b2d14d 100644
--- a/Documentation/devicetree/bindings/net/cpsw.txt
+++ b/Documentation/devicetree/bindings/net/cpsw.txt
@@ -37,6 +37,10 @@ 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 04ba1dc..1460da5 100644
--- a/Documentation/devicetree/bindings/net/keystone-netcp.txt
+++ b/Documentation/devicetree/bindings/net/keystone-netcp.txt
@@ -113,6 +113,12 @@ Optional properties:
will only initialize these ports and attach PHY
driver to them if needed.
+ Properties related to cpts configurations.
+ - 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:
- rx-channel: the navigator packet dma channel name for rx.
diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index 25191e9..e6f1383 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -39,6 +39,11 @@ struct cpts_skb_cb_data {
#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);
@@ -181,9 +186,46 @@ static int cpts_ptp_settime(struct ptp_clock_info *ptp,
return 0;
}
+/* HW TS */
+static int cpts_extts_enable(struct cpts *cpts, u32 index, int on)
+{
+ u32 v;
+
+ if (index >= cpts->info.n_ext_ts)
+ return -ENXIO;
+
+ if (((cpts->hw_ts_enable & BIT(index)) >> index) == on)
+ return 0;
+
+ mutex_lock(&cpts->ptp_clk_mutex);
+
+ 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);
+
+ mutex_unlock(&cpts->ptp_clk_mutex);
+
+ 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;
}
@@ -203,12 +245,12 @@ 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);
+
pr_debug("cpts overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);
queue_delayed_work(cpts->workwq, &cpts->overflow_work,
cpts->ov_check_period);
@@ -222,6 +264,7 @@ static void cpts_overflow_check(struct work_struct *work)
static irqreturn_t cpts_misc_interrupt(int irq, void *dev_id)
{
+ struct ptp_clock_event pevent;
struct cpts *cpts = dev_id;
unsigned long flags;
int i, type = -1;
@@ -264,7 +307,12 @@ static irqreturn_t cpts_misc_interrupt(int irq, void *dev_id)
break;
case CPTS_EV_ROLL:
case CPTS_EV_HALF:
+ break;
case CPTS_EV_HW:
+ 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);
break;
default:
dev_err(cpts->dev, "unknown event type\n");
@@ -573,6 +621,7 @@ static void cpts_calc_mult_shift(struct cpts *cpts)
/* Calc overflow check period (maxsec / 2) */
cpts->ov_check_period = (HZ * maxsec) / 2;
+
dev_info(cpts->dev, "cpts: overflow check period %lu (jiffies)\n",
cpts->ov_check_period);
@@ -605,6 +654,9 @@ static int cpts_of_parse(struct cpts *cpts, struct device_node *node)
(!cpts->cc.mult && cpts->cc.shift))
goto of_error;
+ if (!of_property_read_u32(node, "cpts-ext-ts-inputs", &prop))
+ cpts->ext_ts_inputs = prop;
+
return 0;
of_error:
@@ -652,6 +704,9 @@ 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);
/* save cc.mult original value as it can be modified
* by cpts_ptp_adjfreq().
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index 28a7cdb..4257c87 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -100,6 +100,8 @@ enum {
#define CPTS_FIFO_DEPTH 16
#define CPTS_MAX_EVENTS 32
+#define CPTS_EVENT_RX_TX_TIMEOUT 20 /* ms */
+
struct cpts_event {
struct list_head list;
unsigned long tmo;
@@ -140,6 +142,8 @@ struct cpts {
struct work_struct ts_work;
struct sk_buff_head txq;
struct sk_buff_head rxq;
+ u32 ext_ts_inputs;
+ u32 hw_ts_enable;
};
int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
--
2.10.1
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