[PATCH net-next v5 3/3] net: stmmac: Add driver support for DWMAC5 safety IRQ support

[Suraj Jaiswal]

Add IRQ support to listen HW safety IRQ like ECC(error
correction code), DPP(data path parity), FSM(finite state
machine) fault and print the fault information in the kernel
log.

Signed-off-by: Suraj Jaiswal <quic_jsuraj@xxxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/common.h   |  1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac.h   |  2 ++
 .../net/ethernet/stmicro/stmmac/stmmac_main.c  | 18 ++++++++++++++++++
 .../ethernet/stmicro/stmmac/stmmac_platform.c  |  9 +++++++++
 4 files changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 721c1f8e892f..cb9645fe16d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -347,6 +347,7 @@ enum request_irq_err {
 	REQ_IRQ_ERR_SFTY_UE,
 	REQ_IRQ_ERR_SFTY_CE,
 	REQ_IRQ_ERR_LPI,
+	REQ_IRQ_ERR_SAFETY,
 	REQ_IRQ_ERR_WOL,
 	REQ_IRQ_ERR_MAC,
 	REQ_IRQ_ERR_NO,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 9f89acf31050..aa2eda6fb927 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -33,6 +33,7 @@ struct stmmac_resources {
 	int irq;
 	int sfty_ce_irq;
 	int sfty_ue_irq;
+	int safety_common_irq;
 	int rx_irq[MTL_MAX_RX_QUEUES];
 	int tx_irq[MTL_MAX_TX_QUEUES];
 };
@@ -299,6 +300,7 @@ struct stmmac_priv {
 	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
 	int sfty_ce_irq;
 	int sfty_ue_irq;
+	int safety_common_irq;
 	int rx_irq[MTL_MAX_RX_QUEUES];
 	int tx_irq[MTL_MAX_TX_QUEUES];
 	/*irq name */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 47de466e432c..e4a0d9ec8b3f 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_SAFETY:
+		if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq)
+			free_irq(priv->safety_common_irq, dev);
+		fallthrough;
 	case REQ_IRQ_ERR_WOL:
 		free_irq(dev->irq, dev);
 		fallthrough;
@@ -3798,6 +3802,18 @@ static int stmmac_request_irq_single(struct net_device *dev)
 		}
 	}
 
+	if (priv->safety_common_irq > 0 && priv->safety_common_irq != dev->irq) {
+		ret = request_irq(priv->safety_common_irq, stmmac_safety_interrupt,
+				  0, "safety", dev);
+		if (unlikely(ret < 0)) {
+			netdev_err(priv->dev,
+				   "%s: alloc safety failed %d (error: %d)\n",
+				   __func__, priv->safety_common_irq, ret);
+			irq_err = REQ_IRQ_ERR_SAFETY;
+			goto irq_error;
+		}
+	}
+
 	return 0;
 
 irq_error:
@@ -7464,6 +7480,8 @@ int stmmac_dvr_probe(struct device *device,
 	priv->lpi_irq = res->lpi_irq;
 	priv->sfty_ce_irq = res->sfty_ce_irq;
 	priv->sfty_ue_irq = res->sfty_ue_irq;
+	priv->safety_common_irq = res->safety_common_irq;
+
 	for (i = 0; i < MTL_MAX_RX_QUEUES; i++)
 		priv->rx_irq[i] = res->rx_irq[i];
 	for (i = 0; i < MTL_MAX_TX_QUEUES; i++)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 1ffde555da47..41a4a253d75b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -726,6 +726,15 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 		dev_info(&pdev->dev, "IRQ eth_lpi not found\n");
 	}
 
+	stmmac_res->safety_common_irq =
+		platform_get_irq_byname_optional(pdev, "safety");
+
+	if (stmmac_res->safety_common_irq < 0) {
+		if (stmmac_res->safety_common_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