1 files changed, 75 insertions, 98 deletions

diff --git a/drivers/net/ethernet/ti/icssg/icss_iep.c b/drivers/net/ethernet/ti/icssg/icss_iep.c
index 3025e9c18970..d59c1744840a 100644
--- a/drivers/net/ethernet/ti/icssg/icss_iep.c
+++ b/drivers/net/ethernet/ti/icssg/icss_iep.c
@@ -17,6 +17,7 @@
 #include <linux/timekeeping.h>
 #include <linux/interrupt.h>
 #include <linux/of_irq.h>
+#include <linux/workqueue.h>
 
 #include "icss_iep.h"
 
@@ -52,78 +53,6 @@
 #define IEP_CAP_CFG_CAPNR_1ST_EVENT_EN(n)	BIT(LATCH_INDEX(n))
 #define IEP_CAP_CFG_CAP_ASYNC_EN(n)		BIT(LATCH_INDEX(n) + 10)
 
-enum {
-	ICSS_IEP_GLOBAL_CFG_REG,
-	ICSS_IEP_GLOBAL_STATUS_REG,
-	ICSS_IEP_COMPEN_REG,
-	ICSS_IEP_SLOW_COMPEN_REG,
-	ICSS_IEP_COUNT_REG0,
-	ICSS_IEP_COUNT_REG1,
-	ICSS_IEP_CAPTURE_CFG_REG,
-	ICSS_IEP_CAPTURE_STAT_REG,
-
-	ICSS_IEP_CAP6_RISE_REG0,
-	ICSS_IEP_CAP6_RISE_REG1,
-
-	ICSS_IEP_CAP7_RISE_REG0,
-	ICSS_IEP_CAP7_RISE_REG1,
-
-	ICSS_IEP_CMP_CFG_REG,
-	ICSS_IEP_CMP_STAT_REG,
-	ICSS_IEP_CMP0_REG0,
-	ICSS_IEP_CMP0_REG1,
-	ICSS_IEP_CMP1_REG0,
-	ICSS_IEP_CMP1_REG1,
-
-	ICSS_IEP_CMP8_REG0,
-	ICSS_IEP_CMP8_REG1,
-	ICSS_IEP_SYNC_CTRL_REG,
-	ICSS_IEP_SYNC0_STAT_REG,
-	ICSS_IEP_SYNC1_STAT_REG,
-	ICSS_IEP_SYNC_PWIDTH_REG,
-	ICSS_IEP_SYNC0_PERIOD_REG,
-	ICSS_IEP_SYNC1_DELAY_REG,
-	ICSS_IEP_SYNC_START_REG,
-	ICSS_IEP_MAX_REGS,
-};
-
-/**
- * struct icss_iep_plat_data - Plat data to handle SoC variants
- * @config: Regmap configuration data
- * @reg_offs: register offsets to capture offset differences across SoCs
- * @flags: Flags to represent IEP properties
- */
-struct icss_iep_plat_data {
-	struct regmap_config *config;
-	u32 reg_offs[ICSS_IEP_MAX_REGS];
-	u32 flags;
-};
-
-struct icss_iep {
-	struct device *dev;
-	void __iomem *base;
-	const struct icss_iep_plat_data *plat_data;
-	struct regmap *map;
-	struct device_node *client_np;
-	unsigned long refclk_freq;
-	int clk_tick_time;	/* one refclk tick time in ns */
-	struct ptp_clock_info ptp_info;
-	struct ptp_clock *ptp_clock;
-	struct mutex ptp_clk_mutex;	/* PHC access serializer */
-	spinlock_t irq_lock; /* CMP IRQ vs icss_iep_ptp_enable access */
-	u32 def_inc;
-	s16 slow_cmp_inc;
-	u32 slow_cmp_count;
-	const struct icss_iep_clockops *ops;
-	void *clockops_data;
-	u32 cycle_time_ns;
-	u32 perout_enabled;
-	bool pps_enabled;
-	int cap_cmp_irq;
-	u64 period;
-	u32 latch_enable;
-};
-
 /**
  * icss_iep_get_count_hi() - Get the upper 32 bit IEP counter
  * @iep: Pointer to structure representing IEP.
@@ -192,14 +121,11 @@ static void icss_iep_update_to_next_boundary(struct icss_iep *iep, u64 start_ns)
  */
 static void icss_iep_settime(struct icss_iep *iep, u64 ns)
 {
-	unsigned long flags;
-
 	if (iep->ops && iep->ops->settime) {
 		iep->ops->settime(iep->clockops_data, ns);
 		return;
 	}
 
-	spin_lock_irqsave(&iep->irq_lock, flags);
 	if (iep->pps_enabled || iep->perout_enabled)
 		writel(0, iep->base + iep->plat_data->reg_offs[ICSS_IEP_SYNC_CTRL_REG]);
 
@@ -210,7 +136,6 @@ static void icss_iep_settime(struct icss_iep *iep, u64 ns)
 		writel(IEP_SYNC_CTRL_SYNC_N_EN(0) | IEP_SYNC_CTRL_SYNC_EN,
 		       iep->base + iep->plat_data->reg_offs[ICSS_IEP_SYNC_CTRL_REG]);
 	}
-	spin_unlock_irqrestore(&iep->irq_lock, flags);
 }
 
 /**
@@ -290,6 +215,9 @@ static void icss_iep_enable_shadow_mode(struct icss_iep *iep)
 	for (cmp = IEP_MIN_CMP; cmp < IEP_MAX_CMP; cmp++) {
 		regmap_update_bits(iep->map, ICSS_IEP_CMP_STAT_REG,
 				   IEP_CMP_STATUS(cmp), IEP_CMP_STATUS(cmp));
+
+		regmap_update_bits(iep->map, ICSS_IEP_CMP_CFG_REG,
+				   IEP_CMP_CFG_CMP_EN(cmp), 0);
 	}
 
 	/* enable reset counter on CMP0 event */
@@ -546,36 +474,64 @@ static int icss_iep_perout_enable_hw(struct icss_iep *iep,
 static int icss_iep_perout_enable(struct icss_iep *iep,
 				  struct ptp_perout_request *req, int on)
 {
-	unsigned long flags;
-	int ret = 0;
+	return -EOPNOTSUPP;
+}
+
+static void icss_iep_cap_cmp_work(struct work_struct *work)
+{
+	struct icss_iep *iep = container_of(work, struct icss_iep, work);
+	const u32 *reg_offs = iep->plat_data->reg_offs;
+	struct ptp_clock_event pevent;
+	unsigned int val;
+	u64 ns, ns_next;
 
 	mutex_lock(&iep->ptp_clk_mutex);
 
-	if (iep->pps_enabled) {
-		ret = -EBUSY;
-		goto exit;
+	ns = readl(iep->base + reg_offs[ICSS_IEP_CMP1_REG0]);
+	if (iep->plat_data->flags & ICSS_IEP_64BIT_COUNTER_SUPPORT) {
+		val = readl(iep->base + reg_offs[ICSS_IEP_CMP1_REG1]);
+		ns |= (u64)val << 32;
 	}
+	/* set next event */
+	ns_next = ns + iep->period;
+	writel(lower_32_bits(ns_next),
+	       iep->base + reg_offs[ICSS_IEP_CMP1_REG0]);
+	if (iep->plat_data->flags & ICSS_IEP_64BIT_COUNTER_SUPPORT)
+		writel(upper_32_bits(ns_next),
+		       iep->base + reg_offs[ICSS_IEP_CMP1_REG1]);
 
-	if (iep->perout_enabled == !!on)
-		goto exit;
-
-	spin_lock_irqsave(&iep->irq_lock, flags);
-	ret = icss_iep_perout_enable_hw(iep, req, on);
-	if (!ret)
-		iep->perout_enabled = !!on;
-	spin_unlock_irqrestore(&iep->irq_lock, flags);
+	pevent.pps_times.ts_real = ns_to_timespec64(ns);
+	pevent.type = PTP_CLOCK_PPSUSR;
+	pevent.index = 0;
+	ptp_clock_event(iep->ptp_clock, &pevent);
+	dev_dbg(iep->dev, "IEP:pps ts: %llu next:%llu:\n", ns, ns_next);
 
-exit:
 	mutex_unlock(&iep->ptp_clk_mutex);
+}
 
-	return ret;
+static irqreturn_t icss_iep_cap_cmp_irq(int irq, void *dev_id)
+{
+	struct icss_iep *iep = (struct icss_iep *)dev_id;
+	const u32 *reg_offs = iep->plat_data->reg_offs;
+	unsigned int val;
+
+	val = readl(iep->base + reg_offs[ICSS_IEP_CMP_STAT_REG]);
+	/* The driver only enables CMP1 */
+	if (val & BIT(1)) {
+		/* Clear the event */
+		writel(BIT(1), iep->base + reg_offs[ICSS_IEP_CMP_STAT_REG]);
+		if (iep->pps_enabled || iep->perout_enabled)
+			schedule_work(&iep->work);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
 }
 
 static int icss_iep_pps_enable(struct icss_iep *iep, int on)
 {
 	struct ptp_clock_request rq;
 	struct timespec64 ts;
-	unsigned long flags;
 	int ret = 0;
 	u64 ns;
 
@@ -589,8 +545,6 @@ static int icss_iep_pps_enable(struct icss_iep *iep, int on)
 	if (iep->pps_enabled == !!on)
 		goto exit;
 
-	spin_lock_irqsave(&iep->irq_lock, flags);
-
 	rq.perout.index = 0;
 	if (on) {
 		ns = icss_iep_gettime(iep, NULL);
@@ -602,13 +556,13 @@ static int icss_iep_pps_enable(struct icss_iep *iep, int on)
 		ret = icss_iep_perout_enable_hw(iep, &rq.perout, on);
 	} else {
 		ret = icss_iep_perout_enable_hw(iep, &rq.perout, on);
+		if (iep->cap_cmp_irq)
+			cancel_work_sync(&iep->work);
 	}
 
 	if (!ret)
 		iep->pps_enabled = !!on;
 
-	spin_unlock_irqrestore(&iep->irq_lock, flags);
-
 exit:
 	mutex_unlock(&iep->ptp_clk_mutex);
 
@@ -777,6 +731,8 @@ int icss_iep_init(struct icss_iep *iep, const struct icss_iep_clockops *clkops,
 	if (iep->ops && iep->ops->perout_enable) {
 		iep->ptp_info.n_per_out = 1;
 		iep->ptp_info.pps = 1;
+	} else if (iep->cap_cmp_irq) {
+		iep->ptp_info.pps = 1;
 	}
 
 	if (iep->ops && iep->ops->extts_enable)
@@ -808,6 +764,11 @@ int icss_iep_exit(struct icss_iep *iep)
 	}
 	icss_iep_disable(iep);
 
+	if (iep->pps_enabled)
+		icss_iep_pps_enable(iep, false);
+	else if (iep->perout_enabled)
+		icss_iep_perout_enable(iep, NULL, false);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(icss_iep_exit);
@@ -817,6 +778,7 @@ static int icss_iep_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct icss_iep *iep;
 	struct clk *iep_clk;
+	int ret, irq;
 
 	iep = devm_kzalloc(dev, sizeof(*iep), GFP_KERNEL);
 	if (!iep)
@@ -827,6 +789,22 @@ static int icss_iep_probe(struct platform_device *pdev)
 	if (IS_ERR(iep->base))
 		return -ENODEV;
 
+	irq = platform_get_irq_byname_optional(pdev, "iep_cap_cmp");
+	if (irq == -EPROBE_DEFER)
+		return irq;
+
+	if (irq > 0) {
+		ret = devm_request_irq(dev, irq, icss_iep_cap_cmp_irq,
+				       IRQF_TRIGGER_HIGH, "iep_cap_cmp", iep);
+		if (ret) {
+			dev_info(iep->dev, "cap_cmp irq request failed: %x\n",
+				 ret);
+		} else {
+			iep->cap_cmp_irq = irq;
+			INIT_WORK(&iep->work, icss_iep_cap_cmp_work);
+		}
+	}
+
 	iep_clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(iep_clk))
 		return PTR_ERR(iep_clk);
@@ -853,7 +831,6 @@ static int icss_iep_probe(struct platform_device *pdev)
 
 	iep->ptp_info = icss_iep_ptp_info;
 	mutex_init(&iep->ptp_clk_mutex);
-	spin_lock_init(&iep->irq_lock);
 	dev_set_drvdata(dev, iep);
 	icss_iep_disable(iep);
 
@@ -892,7 +869,7 @@ static int icss_iep_regmap_read(void *context, unsigned int reg,
 	return 0;
 }
 
-static struct regmap_config am654_icss_iep_regmap_config = {
+static const struct regmap_config am654_icss_iep_regmap_config = {
 	.name = "icss iep",
 	.reg_stride = 1,
 	.reg_write = icss_iep_regmap_write,