can: flexcan: Add quirk to handle separate interrupt lines for mailboxes

[ Upstream commit 8c652cf ]

Introduce 'FLEXCAN_QUIRK_SECONDARY_MB_IRQ' quirk to handle a FlexCAN
hardware module integration particularity where two ranges of mailboxes
are controlled by separate hardware interrupt lines.
The same 'flexcan_irq' handler is used for both separate mailbox interrupt
lines, with no other changes.

Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://patch.msgid.link/20250113120704.522307-3-ciprianmarian.costea@oss.nxp.com
[mkl: flexcan_open(): change order and free irq_secondary_mb first]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Ciprian Marian Costea

drivers/net/can/flexcan/flexcan-core.c

@@ -1762,14 +1762,25 @@ static int flexcan_open(struct net_device *dev)
 			goto out_free_irq_boff;
 	}
 
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SECONDARY_MB_IRQ) {
+		err = request_irq(priv->irq_secondary_mb,
+				  flexcan_irq, IRQF_SHARED, dev->name, dev);
+		if (err)
+			goto out_free_irq_err;
+	}
+
 	flexcan_chip_interrupts_enable(dev);
 
 	netif_start_queue(dev);
 
 	return 0;
 
+ out_free_irq_err:
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3)
+		free_irq(priv->irq_err, dev);
  out_free_irq_boff:
-	free_irq(priv->irq_boff, dev);
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3)
+		free_irq(priv->irq_boff, dev);
  out_free_irq:
 	free_irq(dev->irq, dev);
  out_can_rx_offload_disable:
@@ -1794,6 +1805,9 @@ static int flexcan_close(struct net_device *dev)
 	netif_stop_queue(dev);
 	flexcan_chip_interrupts_disable(dev);
 
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SECONDARY_MB_IRQ)
+		free_irq(priv->irq_secondary_mb, dev);
+
 	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
 		free_irq(priv->irq_err, dev);
 		free_irq(priv->irq_boff, dev);
@@ -2187,6 +2201,14 @@ static int flexcan_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SECONDARY_MB_IRQ) {
+		priv->irq_secondary_mb = platform_get_irq_byname(pdev, "mb-1");
+		if (priv->irq_secondary_mb < 0) {
+			err = priv->irq_secondary_mb;
+			goto failed_platform_get_irq;
+		}
+	}
+
 	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SUPPORT_FD) {
 		priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD |
 			CAN_CTRLMODE_FD_NON_ISO;

drivers/net/can/flexcan/flexcan.h

@@ -70,6 +70,10 @@
 #define FLEXCAN_QUIRK_SUPPORT_RX_FIFO BIT(16)
 /* Setup stop mode with ATF SCMI protocol to support wakeup */
 #define FLEXCAN_QUIRK_SETUP_STOP_MODE_SCMI BIT(17)
+/* Device has two separate interrupt lines for two mailbox ranges, which
+ * both need to have an interrupt handler registered.
+ */
+#define FLEXCAN_QUIRK_SECONDARY_MB_IRQ	BIT(18)
 
 struct flexcan_devtype_data {
 	u32 quirks;		/* quirks needed for different IP cores */
@@ -107,6 +111,7 @@ struct flexcan_priv {
 
 	int irq_boff;
 	int irq_err;
+	int irq_secondary_mb;
 
 	/* IPC handle when setup stop mode by System Controller firmware(scfw) */
 	struct imx_sc_ipc *sc_ipc_handle;