linux-kernel - [PATCH net-next 1/2] ethernet: ti: am65-cpts: add routines to support taprio offload

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Date:   Wed, 13 May 2020 09:26:14 -0400
From:   Murali Karicheri <m-karicheri2@...com>
To:     <davem@...emloft.net>, <grygorii.strashko@...com>,
        <ilias.apalodimas@...aro.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <nsekhar@...com>
Subject: [PATCH net-next 1/2] ethernet: ti: am65-cpts: add routines to support taprio offload

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

TAPRIO/EST offload support in CPSW2G requires EST scheduler
function enabled in CPTS. So this patch add a function to
set cycle time for EST scheduler.  It also add a function for
getting time in ns of PHC clock for taprio qdisc configuration.
Mostly to verify if timer update is needed or to get actual
state of oper/admin schedule.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 drivers/net/ethernet/ti/am65-cpts.c | 48 +++++++++++++++++++++++++++++
 drivers/net/ethernet/ti/am65-cpts.h | 24 +++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
index 51c94b2a77b1..c59a289e428c 100644
--- a/drivers/net/ethernet/ti/am65-cpts.c
+++ b/drivers/net/ethernet/ti/am65-cpts.c
@@ -450,6 +450,19 @@ static int am65_cpts_ptp_gettimex(struct ptp_clock_info *ptp,
 	return 0;
 }
 
+u64 am65_cpts_ns_gettime(struct am65_cpts *cpts)
+{
+	u64 ns;
+
+	/* reuse ptp_clk_lock as it serialize ts push */
+	mutex_lock(&cpts->ptp_clk_lock);
+	ns = am65_cpts_gettime(cpts, NULL);
+	mutex_unlock(&cpts->ptp_clk_lock);
+
+	return ns;
+}
+EXPORT_SYMBOL_GPL(am65_cpts_ns_gettime);
+
 static int am65_cpts_ptp_settime(struct ptp_clock_info *ptp,
 				 const struct timespec64 *ts)
 {
@@ -494,6 +507,41 @@ static int am65_cpts_extts_enable(struct am65_cpts *cpts, u32 index, int on)
 	return 0;
 }
 
+int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
+			  struct am65_cpts_estf_cfg *cfg)
+{
+	u64 cycles;
+	u32 val;
+
+	cycles = cfg->ns_period * cpts->refclk_freq;
+	cycles = DIV_ROUND_UP(cycles, NSEC_PER_SEC);
+	if (cycles > U32_MAX)
+		return -EINVAL;
+
+	/* according to TRM should be zeroed */
+	am65_cpts_write32(cpts, 0, estf[idx].length);
+
+	val = upper_32_bits(cfg->ns_start);
+	am65_cpts_write32(cpts, val, estf[idx].comp_hi);
+	val = lower_32_bits(cfg->ns_start);
+	am65_cpts_write32(cpts, val, estf[idx].comp_lo);
+	val = lower_32_bits(cycles);
+	am65_cpts_write32(cpts, val, estf[idx].length);
+
+	dev_dbg(cpts->dev, "%s: ESTF:%u enabled\n", __func__, idx);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(am65_cpts_estf_enable);
+
+void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx)
+{
+	am65_cpts_write32(cpts, 0, estf[idx].length);
+
+	dev_dbg(cpts->dev, "%s: ESTF:%u disabled\n", __func__, idx);
+}
+EXPORT_SYMBOL_GPL(am65_cpts_estf_disable);
+
 static void am65_cpts_perout_enable_hw(struct am65_cpts *cpts,
 				       struct ptp_perout_request *req, int on)
 {
diff --git a/drivers/net/ethernet/ti/am65-cpts.h b/drivers/net/ethernet/ti/am65-cpts.h
index 0b55dc12ba48..98c1960b20b9 100644
--- a/drivers/net/ethernet/ti/am65-cpts.h
+++ b/drivers/net/ethernet/ti/am65-cpts.h
@@ -12,6 +12,11 @@
 
 struct am65_cpts;
 
+struct am65_cpts_estf_cfg {
+	u64 ns_period;
+	u64 ns_start;
+};
+
 #if IS_ENABLED(CONFIG_TI_K3_AM65_CPTS)
 struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 				   struct device_node *node);
@@ -19,6 +24,10 @@ int am65_cpts_phc_index(struct am65_cpts *cpts);
 void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
 void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
 void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en);
+u64 am65_cpts_ns_gettime(struct am65_cpts *cpts);
+int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
+			  struct am65_cpts_estf_cfg *cfg);
+void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx);
 #else
 static inline struct am65_cpts *am65_cpts_create(struct device *dev,
 						 void __iomem *regs,
@@ -45,6 +54,21 @@ static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
 static inline void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
 {
 }
+
+static s64 am65_cpts_ns_gettime(struct am65_cpts *cpts)
+{
+	return 0;
+}
+
+static int am65_cpts_estf_enable(struct am65_cpts *cpts,
+				 int idx, struct am65_cpts_estf_cfg *cfg)
+{
+	return 0;
+}
+
+static void am65_cpts_estf_disable(struct am65_cpts *cpts, int idx)
+{
+}
 #endif
 
 #endif /* K3_CPTS_H_ */
-- 
2.17.1