linux-kernel - [PATCH 2/2] mailbox: arm_mhuv2: Add support for multiple rx interrupt

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Date:   Wed, 29 Mar 2023 16:39:36 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, cristian.marussi@....com,
        vincent.guittot@...aro.org, souvik.chakravarty@....com,
        nicola.mazzucato@....com, Tushar.Khandelwal@....com,
        viresh.kumar@...aro.org, jassisinghbrar@...il.com
Subject: [PATCH 2/2] mailbox: arm_mhuv2: Add support for multiple rx interrupt

ARM MHUv2 can be configured to receive multiple interrupt related to the
receiver block, up to the maximum number of available channels, and not
necessarily grouped into a single combined interrupt.

Allow to register more interrupt for the RX block up to the maximum number
of interrupts supported by an AMBA device.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/mailbox/arm_mhuv2.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/mailbox/arm_mhuv2.c b/drivers/mailbox/arm_mhuv2.c
index c6d4957c4da8..89060bee1fb0 100644
--- a/drivers/mailbox/arm_mhuv2.c
+++ b/drivers/mailbox/arm_mhuv2.c
@@ -163,7 +163,6 @@ enum mhuv2_frame {
  * @send:	Base address of the register mapping region.
  * @recv:	Base address of the register mapping region.
  * @frame:	Frame type: RECEIVER_FRAME or SENDER_FRAME.
- * @irq:	Interrupt.
  * @windows:	Channel windows implemented by the platform.
  * @minor:	Minor version of the controller.
  * @length:	Length of the protocols array in bytes.
@@ -178,7 +177,6 @@ struct mhuv2 {
 		struct mhu2_recv_frame_reg __iomem *recv;
 	};
 	enum mhuv2_frame frame;
-	unsigned int irq;
 	unsigned int windows;
 	unsigned int minor;
 	unsigned int length;
@@ -991,7 +989,6 @@ static int mhuv2_tx_init(struct amba_device *adev, struct mhuv2 *mhu,
 		} else {
 			mhu->mbox.txdone_irq = true;
 			mhu->mbox.txdone_poll = false;
-			mhu->irq = adev->irq[0];
 
 			writel_relaxed_bitfield(1, &mhu->send->int_en, struct int_en_t, chcomb);
 
@@ -1029,18 +1026,23 @@ static int mhuv2_rx_init(struct amba_device *adev, struct mhuv2 *mhu,
 	mhu->windows = readl_relaxed_bitfield(&mhu->recv->mhu_cfg, struct mhu_cfg_t, num_ch);
 	mhu->minor = readl_relaxed_bitfield(&mhu->recv->aidr, struct aidr_t, arch_minor_rev);
 
-	mhu->irq = adev->irq[0];
-	if (!mhu->irq) {
-		dev_err(dev, "Missing receiver IRQ\n");
-		return -EINVAL;
-	}
+	for (i = 0; i < min_t(unsigned int, mhu->windows, AMBA_NR_IRQS); i++) {
+		if (!adev->irq[i]) {
+			/* At least one receiver IRQ is needed */
+			if (i == 0) {
+				dev_err(dev, "Missing receiver IRQ\n");
+				return -EINVAL;
+			}
+			continue;
+		}
 
-	ret = devm_request_threaded_irq(dev, mhu->irq, NULL,
-					mhuv2_receiver_interrupt, IRQF_ONESHOT,
-					"mhuv2-rx", mhu);
-	if (ret) {
-		dev_err(dev, "Failed to request rx IRQ\n");
-		return ret;
+		ret = devm_request_threaded_irq(dev, adev->irq[i], NULL,
+						mhuv2_receiver_interrupt, IRQF_ONESHOT,
+						"mhuv2-rx", mhu);
+		if (ret) {
+			dev_err(dev, "Failed to request rx IRQ\n");
+			return ret;
+		}
 	}
 
 	/* Mask all the channel windows */
-- 
2.34.1