[PATCH net-next v10 3/3] net: stmmac: Add driver support for common safety IRQ

[Suraj Jaiswal]

Add support to listen HW safety IRQ like ECC(error
correction code), DPP(data path parity), FSM(finite state
machine) fault in common IRQ line.

Signed-off-by: Suraj Jaiswal <quic_jsuraj@xxxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/common.h  |  1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  3 ++
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 41 ++++++++++++++++++-
 .../ethernet/stmicro/stmmac/stmmac_platform.c |  8 ++++
 4 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 721c1f8e892f..b9233b09b80f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -344,6 +344,7 @@ enum request_irq_err {
 	REQ_IRQ_ERR_ALL,
 	REQ_IRQ_ERR_TX,
 	REQ_IRQ_ERR_RX,
+	REQ_IRQ_ERR_SFTY,
 	REQ_IRQ_ERR_SFTY_UE,
 	REQ_IRQ_ERR_SFTY_CE,
 	REQ_IRQ_ERR_LPI,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 9f89acf31050..ca3d93851bed 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -31,6 +31,7 @@ struct stmmac_resources {
 	int wol_irq;
 	int lpi_irq;
 	int irq;
+	int sfty_irq;
 	int sfty_ce_irq;
 	int sfty_ue_irq;
 	int rx_irq[MTL_MAX_RX_QUEUES];
@@ -297,6 +298,7 @@ struct stmmac_priv {
 	void __iomem *ptpaddr;
 	void __iomem *estaddr;
 	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
+	int sfty_irq;
 	int sfty_ce_irq;
 	int sfty_ue_irq;
 	int rx_irq[MTL_MAX_RX_QUEUES];
@@ -305,6 +307,7 @@ struct stmmac_priv {
 	char int_name_mac[IFNAMSIZ + 9];
 	char int_name_wol[IFNAMSIZ + 9];
 	char int_name_lpi[IFNAMSIZ + 9];
+	char int_name_sfty[IFNAMSIZ + 10];
 	char int_name_sfty_ce[IFNAMSIZ + 10];
 	char int_name_sfty_ue[IFNAMSIZ + 10];
 	char int_name_rx_irq[MTL_MAX_TX_QUEUES][IFNAMSIZ + 14];
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 47de466e432c..e0192a282121 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3592,6 +3592,10 @@ static void stmmac_free_irq(struct net_device *dev,
 		if (priv->wol_irq > 0 && priv->wol_irq != dev->irq)
 			free_irq(priv->wol_irq, dev);
 		fallthrough;
+	case REQ_IRQ_ERR_SFTY:
+		if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq)
+			free_irq(priv->sfty_irq, dev);
+		fallthrough;
 	case REQ_IRQ_ERR_WOL:
 		free_irq(dev->irq, dev);
 		fallthrough;
@@ -3661,6 +3665,23 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
 		}
 	}
 
+	/* Request the common Safety Feature Correctible/Uncorrectible
+	 * Error line in case of another line is used
+	 */
+	if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
+		int_name = priv->int_name_sfty;
+		sprintf(int_name, "%s:%s", dev->name, "safety");
+		ret = request_irq(priv->sfty_irq, stmmac_safety_interrupt,
+				  0, int_name, dev);
+		if (unlikely(ret < 0)) {
+			netdev_err(priv->dev,
+				   "%s: alloc sfty MSI %d (error: %d)\n",
+				   __func__, priv->sfty_irq, ret);
+			irq_err = REQ_IRQ_ERR_SFTY;
+			goto irq_error;
+		}
+	}
+
 	/* Request the Safety Feature Correctible Error line in
 	 * case of another line is used
 	 */
@@ -3798,6 +3819,21 @@ static int stmmac_request_irq_single(struct net_device *dev)
 		}
 	}
 
+	/* Request the common Safety Feature Correctible/Uncorrectible
+	 * Error line in case of another line is used
+	 */
+	if (priv->sfty_irq > 0 && priv->sfty_irq != dev->irq) {
+		ret = request_irq(priv->sfty_irq, stmmac_safety_interrupt,
+				  IRQF_SHARED, dev->name, dev);
+		if (unlikely(ret < 0)) {
+			netdev_err(priv->dev,
+				   "%s: ERROR: allocating the sfty IRQ %d (%d)\n",
+				   __func__, priv->sfty_irq, ret);
+			irq_err = REQ_IRQ_ERR_SFTY;
+			goto irq_error;
+		}
+	}
+
 	return 0;
 
 irq_error:
@@ -6022,8 +6058,8 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	if (test_bit(STMMAC_DOWN, &priv->state))
 		return IRQ_HANDLED;
 
-	/* Check if a fatal error happened */
-	if (stmmac_safety_feat_interrupt(priv))
+	/* Check ASP error if it isn't delivered via an individual IRQ */
+	if (priv->sfty_irq <= 0 && stmmac_safety_feat_interrupt(priv))
 		return IRQ_HANDLED;
 
 	/* To handle Common interrupts */
@@ -7462,6 +7498,7 @@ int stmmac_dvr_probe(struct device *device,
 	priv->dev->irq = res->irq;
 	priv->wol_irq = res->wol_irq;
 	priv->lpi_irq = res->lpi_irq;
+	priv->sfty_irq = res->sfty_irq;
 	priv->sfty_ce_irq = res->sfty_ce_irq;
 	priv->sfty_ue_irq = res->sfty_ue_irq;
 	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 70eadc83ca68..ab250161fd79 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -743,6 +743,14 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
 	}
 
+	stmmac_res->sfty_irq =
+		platform_get_irq_byname_optional(pdev, "sfty");
+	if (stmmac_res->sfty_irq < 0) {
+		if (stmmac_res->sfty_irq == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		dev_info(&pdev->dev, "IRQ safety IRQ not found\n");
+	}
+
 	stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
 
 	return PTR_ERR_OR_ZERO(stmmac_res->addr);
-- 
2.25.1