linux-kernel - [PATCH] arm pl011 serial: support multi-irq request

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Date:   Tue, 29 Jun 2021 09:29:24 +0800
From:   Bing Fan <hptsfb@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm pl011 serial: support multi-irq request

From: Bing Fan <tombinfan@...cent.com>

In order to make pl011 work better, multiple interrupts are
required, such as TXIM, RXIM, RTIM, error interrupt(FE/PE/BE/OE);
at the same time, pl011 to GIC does not merge the interrupt
lines(each serial-interrupt corresponding to different GIC hardware
interrupt), so need to enable and request multiple gic interrupt
numbers in the driver.

Signed-off-by: Bing Fan <tombinfan@...cent.com>
---
 drivers/tty/serial/amba-pl011.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 78682c12156a..b63164e89903 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1703,9 +1703,30 @@ static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
 
 static int pl011_allocate_irq(struct uart_amba_port *uap)
 {
+	int ret = -1;
+	int i = 0;
+	unsigned int virq = 0;
+	struct amba_device *amba_dev = (struct amba_device *)uap->port.dev;
+
+	if (!amba_dev)
+		return -1;
+
 	pl011_write(uap->im, uap, REG_IMSC);
 
-	return request_irq(uap->port.irq, pl011_int, IRQF_SHARED, "uart-pl011", uap);
+	for (i = 0; i < AMBA_NR_IRQS; i++) {
+		virq = amba_dev->irq[i];
+		if (virq == 0)
+			break;
+
+		ret = request_irq(virq, pl011_int, IRQF_SHARED, "uart-pl011-*", uap);
+		if (ret < 0) {
+			dev_info(uap->port.dev, "%s %d request %u interrupt failed\n",
+					__func__, __LINE__, virq);
+			break;
+		}
+	}
+
+	return ret;
 }
 
 /*
-- 
2.17.1