net: lan743x: Add support for PTP-IO Event Output (Periodic Output)

Add support for PTP-IO Event Output (Periodic Output - perout) for
PCI11010/PCI11414 chips
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/lan743x_main.h

@@ -336,6 +336,7 @@
 #define INT_MOD_CFG9			(0x7E4)
 
 #define PTP_CMD_CTL					(0x0A00)
+#define PTP_CMD_CTL_PTP_LTC_TARGET_READ_		BIT(13)
 #define PTP_CMD_CTL_PTP_CLK_STP_NSEC_			BIT(6)
 #define PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_			BIT(5)
 #define PTP_CMD_CTL_PTP_CLOCK_LOAD_			BIT(4)
@@ -357,6 +358,30 @@
 	(((value) & 0x7) << (1 + ((channel) << 2)))
 #define PTP_GENERAL_CONFIG_RELOAD_ADD_X_(channel)	(BIT((channel) << 2))
 
+#define HS_PTP_GENERAL_CONFIG				(0x0A04)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_(channel) \
+	(0xf << (4 + ((channel) << 2)))
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_	(0)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500NS_	(1)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1US_		(2)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5US_		(3)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_		(4)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50US_		(5)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_	(6)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500US_	(7)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_		(8)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5MS_		(9)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_		(10)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50MS_		(11)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100MS_	(12)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_	(13)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_TOGG_		(14)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_INT_		(15)
+#define HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_(channel, value) \
+	(((value) & 0xf) << (4 + ((channel) << 2)))
+#define HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(channel)	(BIT(1 + ((channel) * 2)))
+#define HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(channel)	(BIT((channel) * 2))
+
 #define PTP_INT_STS				(0x0A08)
 #define PTP_INT_IO_FE_MASK_			GENMASK(31, 24)
 #define PTP_INT_IO_FE_SHIFT_			(24)
@@ -364,9 +389,17 @@
 #define PTP_INT_IO_RE_MASK_			GENMASK(23, 16)
 #define PTP_INT_IO_RE_SHIFT_			(16)
 #define PTP_INT_IO_RE_SET_(channel)		BIT(16 + (channel))
+#define PTP_INT_TX_TS_OVRFL_INT_		BIT(14)
+#define PTP_INT_TX_SWTS_ERR_INT_		BIT(13)
+#define PTP_INT_TX_TS_INT_			BIT(12)
+#define PTP_INT_RX_TS_OVRFL_INT_		BIT(9)
+#define PTP_INT_RX_TS_INT_			BIT(8)
+#define PTP_INT_TIMER_INT_B_			BIT(1)
+#define PTP_INT_TIMER_INT_A_			BIT(0)
 #define PTP_INT_EN_SET				(0x0A0C)
 #define PTP_INT_EN_FE_EN_SET_(channel)		BIT(24 + (channel))
 #define PTP_INT_EN_RE_EN_SET_(channel)		BIT(16 + (channel))
+#define PTP_INT_EN_TIMER_SET_(channel)		BIT(channel)
 #define PTP_INT_EN_CLR				(0x0A10)
 #define PTP_INT_EN_FE_EN_CLR_(channel)		BIT(24 + (channel))
 #define PTP_INT_EN_RE_EN_CLR_(channel)		BIT(16 + (channel))

drivers/net/ethernet/microchip/lan743x_ptp.c

@@ -689,6 +689,215 @@ static int lan743x_ptp_perout(struct lan743x_adapter *adapter, int on,
 	return ret;
 }
 
+static void lan743x_ptp_io_perout_off(struct lan743x_adapter *adapter,
+				      u32 index)
+{
+	struct lan743x_ptp *ptp = &adapter->ptp;
+	int perout_pin;
+	int event_ch;
+	u32 gen_cfg;
+	int val;
+
+	event_ch = ptp->ptp_io_perout[index];
+	if (event_ch >= 0) {
+		/* set target to far in the future, effectively disabling it */
+		lan743x_csr_write(adapter,
+				  PTP_CLOCK_TARGET_SEC_X(event_ch),
+				  0xFFFF0000);
+		lan743x_csr_write(adapter,
+				  PTP_CLOCK_TARGET_NS_X(event_ch),
+				  0);
+
+		gen_cfg = lan743x_csr_read(adapter, HS_PTP_GENERAL_CONFIG);
+		gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_
+				    (event_ch));
+		gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(event_ch));
+		gen_cfg |= HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(event_ch);
+		lan743x_csr_write(adapter, HS_PTP_GENERAL_CONFIG, gen_cfg);
+		if (event_ch)
+			lan743x_csr_write(adapter, PTP_INT_STS,
+					  PTP_INT_TIMER_INT_B_);
+		else
+			lan743x_csr_write(adapter, PTP_INT_STS,
+					  PTP_INT_TIMER_INT_A_);
+		lan743x_ptp_release_event_ch(adapter, event_ch);
+		ptp->ptp_io_perout[index] = -1;
+	}
+
+	perout_pin = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT, index);
+
+	/* Deselect Event output */
+	val = lan743x_csr_read(adapter, PTP_IO_EVENT_OUTPUT_CFG);
+
+	/* Disables the output of Local Time Target compare events */
+	val &= ~PTP_IO_EVENT_OUTPUT_CFG_EN_(perout_pin);
+	lan743x_csr_write(adapter, PTP_IO_EVENT_OUTPUT_CFG, val);
+
+	/* Configured as an opendrain driver*/
+	val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+	val &= ~PTP_IO_PIN_CFG_OBUF_TYPE_(perout_pin);
+	lan743x_csr_write(adapter, PTP_IO_PIN_CFG, val);
+	/* Dummy read to make sure write operation success */
+	val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+}
+
+static int lan743x_ptp_io_perout(struct lan743x_adapter *adapter, int on,
+				 struct ptp_perout_request *perout_request)
+{
+	struct lan743x_ptp *ptp = &adapter->ptp;
+	u32 period_sec, period_nsec;
+	u32 start_sec, start_nsec;
+	u32 pulse_sec, pulse_nsec;
+	int pulse_width;
+	int perout_pin;
+	int event_ch;
+	u32 gen_cfg;
+	u32 index;
+	int val;
+
+	index = perout_request->index;
+	event_ch = ptp->ptp_io_perout[index];
+
+	if (on) {
+		perout_pin = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT, index);
+		if (perout_pin < 0)
+			return -EBUSY;
+	} else {
+		lan743x_ptp_io_perout_off(adapter, index);
+		return 0;
+	}
+
+	if (event_ch >= LAN743X_PTP_N_EVENT_CHAN) {
+		/* already on, turn off first */
+		lan743x_ptp_io_perout_off(adapter, index);
+	}
+
+	event_ch = lan743x_ptp_reserve_event_ch(adapter, index);
+	if (event_ch < 0) {
+		netif_warn(adapter, drv, adapter->netdev,
+			   "Failed to reserve event channel %d for PEROUT\n",
+			   index);
+		goto failed;
+	}
+	ptp->ptp_io_perout[index] = event_ch;
+
+	if (perout_request->flags & PTP_PEROUT_DUTY_CYCLE) {
+		pulse_sec = perout_request->on.sec;
+		pulse_sec += perout_request->on.nsec / 1000000000;
+		pulse_nsec = perout_request->on.nsec % 1000000000;
+	} else {
+		pulse_sec = perout_request->period.sec;
+		pulse_sec += perout_request->period.nsec / 1000000000;
+		pulse_nsec = perout_request->period.nsec % 1000000000;
+	}
+
+	if (pulse_sec == 0) {
+		if (pulse_nsec >= 400000000) {
+			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
+		} else if (pulse_nsec >= 200000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100MS_;
+		} else if (pulse_nsec >= 100000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50MS_;
+		} else if (pulse_nsec >= 20000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_;
+		} else if (pulse_nsec >= 10000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5MS_;
+		} else if (pulse_nsec >= 2000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_;
+		} else if (pulse_nsec >= 1000000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500US_;
+		} else if (pulse_nsec >= 200000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_;
+		} else if (pulse_nsec >= 100000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_50US_;
+		} else if (pulse_nsec >= 20000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_;
+		} else if (pulse_nsec >= 10000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_5US_;
+		} else if (pulse_nsec >= 2000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_1US_;
+		} else if (pulse_nsec >= 1000) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_500NS_;
+		} else if (pulse_nsec >= 200) {
+			pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_;
+		} else {
+			netif_warn(adapter, drv, adapter->netdev,
+				   "perout period too small, min is 200nS\n");
+			goto failed;
+		}
+	} else {
+		pulse_width = HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
+	}
+
+	/* turn off by setting target far in future */
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_SEC_X(event_ch),
+			  0xFFFF0000);
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_NS_X(event_ch), 0);
+
+	/* Configure to pulse every period */
+	gen_cfg = lan743x_csr_read(adapter, HS_PTP_GENERAL_CONFIG);
+	gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_(event_ch));
+	gen_cfg |= HS_PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_
+			  (event_ch, pulse_width);
+	gen_cfg |= HS_PTP_GENERAL_CONFIG_EVENT_POL_X_(event_ch);
+	gen_cfg &= ~(HS_PTP_GENERAL_CONFIG_RELOAD_ADD_X_(event_ch));
+	lan743x_csr_write(adapter, HS_PTP_GENERAL_CONFIG, gen_cfg);
+
+	/* set the reload to one toggle cycle */
+	period_sec = perout_request->period.sec;
+	period_sec += perout_request->period.nsec / 1000000000;
+	period_nsec = perout_request->period.nsec % 1000000000;
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_RELOAD_SEC_X(event_ch),
+			  period_sec);
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_RELOAD_NS_X(event_ch),
+			  period_nsec);
+
+	start_sec = perout_request->start.sec;
+	start_sec += perout_request->start.nsec / 1000000000;
+	start_nsec = perout_request->start.nsec % 1000000000;
+
+	/* set the start time */
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_SEC_X(event_ch),
+			  start_sec);
+	lan743x_csr_write(adapter,
+			  PTP_CLOCK_TARGET_NS_X(event_ch),
+			  start_nsec);
+
+	/* Enable LTC Target Read */
+	val = lan743x_csr_read(adapter, PTP_CMD_CTL);
+	val |= PTP_CMD_CTL_PTP_LTC_TARGET_READ_;
+	lan743x_csr_write(adapter, PTP_CMD_CTL, val);
+
+	/* Configure as an push/pull driver */
+	val = lan743x_csr_read(adapter, PTP_IO_PIN_CFG);
+	val |= PTP_IO_PIN_CFG_OBUF_TYPE_(perout_pin);
+	lan743x_csr_write(adapter, PTP_IO_PIN_CFG, val);
+
+	/* Select Event output */
+	val = lan743x_csr_read(adapter, PTP_IO_EVENT_OUTPUT_CFG);
+	if (event_ch)
+		/* Channel B as the output */
+		val |= PTP_IO_EVENT_OUTPUT_CFG_SEL_(perout_pin);
+	else
+		/* Channel A as the output */
+		val &= ~PTP_IO_EVENT_OUTPUT_CFG_SEL_(perout_pin);
+
+	/* Enables the output of Local Time Target compare events */
+	val |= PTP_IO_EVENT_OUTPUT_CFG_EN_(perout_pin);
+	lan743x_csr_write(adapter, PTP_IO_EVENT_OUTPUT_CFG, val);
+
+	return 0;
+
+failed:
+	lan743x_ptp_io_perout_off(adapter, index);
+	return -ENODEV;
+}
+
 static void lan743x_ptp_io_extts_off(struct lan743x_adapter *adapter,
 				     u32 index)
 {
@@ -812,9 +1021,14 @@ static int lan743x_ptpci_enable(struct ptp_clock_info *ptpci,
 							 &request->extts);
 			return -EINVAL;
 		case PTP_CLK_REQ_PEROUT:
-			if (request->perout.index < ptpci->n_per_out)
+			if (request->perout.index < ptpci->n_per_out) {
+				if (adapter->is_pci11x1x)
+					return lan743x_ptp_io_perout(adapter, on,
+							     &request->perout);
+				else
 					return lan743x_ptp_perout(adapter, on,
 							  &request->perout);
+			}
 			return -EINVAL;
 		case PTP_CLK_REQ_PPS:
 			return -EINVAL;

drivers/net/ethernet/microchip/lan743x_ptp.h

@@ -80,6 +80,7 @@ struct lan743x_ptp {
 
 	unsigned long used_event_ch;
 	struct lan743x_ptp_perout perout[LAN743X_PTP_N_PEROUT];
+	int ptp_io_perout[LAN743X_PTP_N_PEROUT]; /* PTP event channel (0=channel A, 1=channel B) */
 	struct lan743x_extts extts[LAN743X_PTP_N_EXTTS];
 
 	bool leds_multiplexed;