[PATCH] dma: dw-axi-dmac: support per channel interrupt

[Baruch Siach <baruch@tkos.co.il>]

Hardware might not support a single combined interrupt that covers all
channels. In that case we have to deal with interrupt per channel. Add
support for that configuration.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 29 ++++++++++++++-----
 drivers/dma/dw-axi-dmac/dw-axi-dmac.h         |  2 +-
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index a86a81ff0caa..b5a5dd523dd6 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -1445,6 +1445,24 @@ static int parse_device_properties(struct axi_dma_chip *chip)
 	return 0;
 }
 
+static int axi_req_irqs(struct platform_device *pdev, struct axi_dma_chip *chip)
+{
+	int irq_count = platform_irq_count(pdev);
+	int ret;
+
+	for (int i = 0; i < irq_count; i++) {
+		chip->irq[i] = platform_get_irq(pdev, i);
+		if (chip->irq[i] < 0)
+			return chip->irq[i];
+		ret = devm_request_irq(chip->dev, chip->irq[i], dw_axi_dma_interrupt,
+				IRQF_SHARED, KBUILD_MODNAME, chip);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int dw_probe(struct platform_device *pdev)
 {
 	struct axi_dma_chip *chip;
@@ -1471,10 +1489,6 @@ static int dw_probe(struct platform_device *pdev)
 	chip->dev = &pdev->dev;
 	chip->dw->hdata = hdata;
 
-	chip->irq = platform_get_irq(pdev, 0);
-	if (chip->irq < 0)
-		return chip->irq;
-
 	chip->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(chip->regs))
 		return PTR_ERR(chip->regs);
@@ -1515,8 +1529,7 @@ static int dw_probe(struct platform_device *pdev)
 	if (!dw->chan)
 		return -ENOMEM;
 
-	ret = devm_request_irq(chip->dev, chip->irq, dw_axi_dma_interrupt,
-			       IRQF_SHARED, KBUILD_MODNAME, chip);
+	ret = axi_req_irqs(pdev, chip);
 	if (ret)
 		return ret;
 
@@ -1629,7 +1642,9 @@ static void dw_remove(struct platform_device *pdev)
 	pm_runtime_disable(chip->dev);
 	axi_dma_suspend(chip);
 
-	devm_free_irq(chip->dev, chip->irq, chip);
+	for (i = 0; i < DMAC_MAX_CHANNELS; i++)
+		if (chip->irq[i] > 0)
+			devm_free_irq(chip->dev, chip->irq[i], chip);
 
 	of_dma_controller_free(chip->dev->of_node);
 
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
index 454904d99654..fd8bfb90bc25 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
@@ -65,7 +65,7 @@ struct dw_axi_dma {
 
 struct axi_dma_chip {
 	struct device		*dev;
-	int			irq;
+	int			irq[DMAC_MAX_CHANNELS];
 	void __iomem		*regs;
 	void __iomem		*apb_regs;
 	struct clk		*core_clk;
-- 
2.43.0