[PATCH net-next v3 3/3] net: stmmac: Add driver support for DWMAC5 fault IRQ Support

[Suraj Jaiswal]

Add IRQ support to listen HW fault like ECC,DPP,FSM
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 | 20 +++++++++++++++++++
 4 files changed, 41 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 6b935922054d..c4821c7ab674 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 cd7a9768de5f..8893d4b7fa38 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_intr;
 	int rx_irq[MTL_MAX_RX_QUEUES];
 	int tx_irq[MTL_MAX_TX_QUEUES];
 };
@@ -331,6 +332,7 @@ struct stmmac_priv {
 	/* XDP BPF Program */
 	unsigned long *af_xdp_zc_qps;
 	struct bpf_prog *xdp_prog;
+	int safety_common_intr;
 };
 
 enum stmmac_state {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8964fc8a955f..2ae4f34444de 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3530,6 +3530,10 @@ 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_intr > 0 && priv->safety_common_intr != dev->irq)
+			free_irq(priv->safety_common_intr, dev);
+		fallthrough;
 	case REQ_IRQ_ERR_WOL:
 		free_irq(dev->irq, dev);
 		fallthrough;
@@ -3736,6 +3740,18 @@ static int stmmac_request_irq_single(struct net_device *dev)
 		}
 	}
 
+	if (priv->safety_common_intr > 0 && priv->safety_common_intr != dev->irq) {
+		ret = request_irq(priv->safety_common_intr, 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_intr, ret);
+			irq_err = REQ_IRQ_ERR_SAFETY;
+			goto irq_error;
+		}
+	}
+
 	return 0;
 
 irq_error:
@@ -7398,6 +7414,8 @@ 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_intr = res->safety_common_intr;
+
 	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..bae1704d5f4b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -690,9 +690,25 @@ devm_stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 #endif /* CONFIG_OF */
 EXPORT_SYMBOL_GPL(devm_stmmac_probe_config_dt);
 
+int stmmac_get_fault_intr_config(struct platform_device *pdev, struct stmmac_resources *res)
+{
+	int ret = 0;
+
+	res->safety_common_intr = platform_get_irq_byname(pdev, "safety");
+
+	if (res->safety_common_intr < 0) {
+		if (res->safety_common_intr != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "safety IRQ configuration information not found\n");
+		ret = 1;
+	}
+
+	return ret;
+}
+
 int stmmac_get_platform_resources(struct platform_device *pdev,
 				  struct stmmac_resources *stmmac_res)
 {
+	int ret = 0;
 	memset(stmmac_res, 0, sizeof(*stmmac_res));
 
 	/* Get IRQ information early to have an ability to ask for deferred
@@ -702,6 +718,10 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 	if (stmmac_res->irq < 0)
 		return stmmac_res->irq;
 
+	ret = stmmac_get_fault_intr_config(pdev, stmmac_res);
+	if (ret)
+		dev_err(&pdev->dev, "Fault interrupt not present\n");
+
 	/* On some platforms e.g. SPEAr the wake up irq differs from the mac irq
 	 * The external wake up irq can be passed through the platform code
 	 * named as "eth_wake_irq"
-- 
2.25.1