dmaengine: fsl-edma: add i.mx7ulp edma2 version support

Add edma2 for i.mx7ulp by version v3, since v2 has already
been used by mcf-edma.
The big changes based on v1 are belows:
1. only one dmamux.
2. another clock dma_clk except dmamux clk.
3. 16 independent interrupts instead of only one interrupt for
all channels.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Link: https://lore.kernel.org/r/1563952834-7731-1-git-send-email-yibin.gong@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 71650fa01f18..dfce75c2991b 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -158,6 +158,49 @@ fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma
 	return 0;
 }
 
+static int
+fsl_edma2_irq_init(struct platform_device *pdev,
+		   struct fsl_edma_engine *fsl_edma)
+{
+	int i, ret, irq;
+	int count;
+
+	count = platform_irq_count(pdev);
+	dev_dbg(&pdev->dev, "%s Found %d interrupts\r\n", __func__, count);
+	if (count <= 2) {
+		dev_err(&pdev->dev, "Interrupts in DTS not correct.\n");
+		return -EINVAL;
+	}
+	/*
+	 * 16 channel independent interrupts + 1 error interrupt on i.mx7ulp.
+	 * 2 channel share one interrupt, for example, ch0/ch16, ch1/ch17...
+	 * For now, just simply request irq without IRQF_SHARED flag, since 16
+	 * channels are enough on i.mx7ulp whose M4 domain own some peripherals.
+	 */
+	for (i = 0; i < count; i++) {
+		irq = platform_get_irq(pdev, i);
+		if (irq < 0)
+			return -ENXIO;
+
+		sprintf(fsl_edma->chans[i].chan_name, "eDMA2-CH%02d", i);
+
+		/* The last IRQ is for eDMA err */
+		if (i == count - 1)
+			ret = devm_request_irq(&pdev->dev, irq,
+						fsl_edma_err_handler,
+						0, "eDMA2-ERR", fsl_edma);
+		else
+			ret = devm_request_irq(&pdev->dev, irq,
+						fsl_edma_tx_handler, 0,
+						fsl_edma->chans[i].chan_name,
+						fsl_edma);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static void fsl_edma_irq_exit(
 		struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
 {
@@ -183,8 +226,16 @@ static struct fsl_edma_drvdata vf610_data = {
 	.setup_irq = fsl_edma_irq_init,
 };
 
+static struct fsl_edma_drvdata imx7ulp_data = {
+	.version = v3,
+	.dmamuxs = 1,
+	.has_dmaclk = true,
+	.setup_irq = fsl_edma2_irq_init,
+};
+
 static const struct of_device_id fsl_edma_dt_ids[] = {
 	{ .compatible = "fsl,vf610-edma", .data = &vf610_data},
+	{ .compatible = "fsl,imx7ulp-edma", .data = &imx7ulp_data},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
@@ -232,6 +283,20 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	fsl_edma_setup_regs(fsl_edma);
 	regs = &fsl_edma->regs;
 
+	if (drvdata->has_dmaclk) {
+		fsl_edma->dmaclk = devm_clk_get(&pdev->dev, "dma");
+		if (IS_ERR(fsl_edma->dmaclk)) {
+			dev_err(&pdev->dev, "Missing DMA block clock.\n");
+			return PTR_ERR(fsl_edma->dmaclk);
+		}
+
+		ret = clk_prepare_enable(fsl_edma->dmaclk);
+		if (ret) {
+			dev_err(&pdev->dev, "DMA clk block failed.\n");
+			return ret;
+		}
+	}
+
 	for (i = 0; i < fsl_edma->drvdata->dmamuxs; i++) {
 		char clkname[32];