[PATCH v1 4/6] dmaengine: fsl-edma: add i.mx7ulp edma2 version support

[Robin Gong]

  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@xxxxxxx>
---
 drivers/dma/fsl-edma-common.c | 18 ++++++++++-
 drivers/dma/fsl-edma-common.h |  3 ++
 drivers/dma/fsl-edma.c        | 69 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 88 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index bb24251..64e822e 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -90,6 +90,19 @@ static void mux_configure8(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
 	iowrite8(val8, addr + off);
 }
 
+void mux_configure32(struct fsl_edma_chan *fsl_chan, void __iomem *addr,
+		     u32 off, u32 slot, bool enable)
+{
+	u32 val;
+
+	if (enable)
+		val = EDMAMUX_CHCFG_ENBL << 24 | slot;
+	else
+		val = EDMAMUX_CHCFG_DIS;
+
+	iowrite32(val, addr + off * 4);
+}
+
 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 			unsigned int slot, bool enable)
 {
@@ -102,7 +115,10 @@ void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
 	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
 	slot = EDMAMUX_CHCFG_SOURCE(slot);
 
-	mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
+	if (fsl_chan->edma->version == v3)
+		mux_configure32(fsl_chan, muxaddr, ch_off, slot, enable);
+	else
+		mux_configure8(fsl_chan, muxaddr, ch_off, slot, enable);
 }
 EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);
 
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 21a9cfd..2b0cc8e 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -124,6 +124,7 @@ struct fsl_edma_chan {
 	dma_addr_t			dma_dev_addr;
 	u32				dma_dev_size;
 	enum dma_data_direction		dma_dir;
+	char				chan_name[16];
 };
 
 struct fsl_edma_desc {
@@ -138,6 +139,7 @@ struct fsl_edma_desc {
 enum edma_version {
 	v1, /* 32ch, Vybrid, mpc57x, etc */
 	v2, /* 64ch Coldfire */
+	v3, /* 32ch, i.mx7ulp */
 };
 
 struct fsl_edma_engine {
@@ -145,6 +147,7 @@ struct fsl_edma_engine {
 	void __iomem		*membase;
 	void __iomem		*muxbase[DMAMUX_NR];
 	struct clk		*muxclk[DMAMUX_NR];
+	struct clk		*dmaclk;
 	u32			dmamux_nr;
 	struct mutex		fsl_edma_mutex;
 	u32			n_chans;
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 7b65ef4..1568070 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -165,6 +165,51 @@ 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)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int i, ret, irq;
+	int count = 0;
+
+	count = of_irq_count(np);
+	dev_info(&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)
 {
@@ -218,6 +263,23 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	fsl_edma_setup_regs(fsl_edma);
 	regs = &fsl_edma->regs;
 
+	if (of_device_is_compatible(np, "fsl,imx7ulp-edma")) {
+		fsl_edma->dmamux_nr = 1;
+		fsl_edma->version = v3;
+
+		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->dmamux_nr; i++) {
 		char clkname[32];
 
@@ -264,7 +326,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	}
 
 	edma_writel(fsl_edma, ~0, regs->intl);
-	ret = fsl_edma_irq_init(pdev, fsl_edma);
+
+	if (fsl_edma->version == v3)
+		ret = fsl_edma2_irq_init(pdev, fsl_edma);
+	else
+		ret = fsl_edma_irq_init(pdev, fsl_edma);
 	if (ret)
 		return ret;
 
@@ -385,6 +451,7 @@ static const struct dev_pm_ops fsl_edma_pm_ops = {
 
 static const struct of_device_id fsl_edma_dt_ids[] = {
 	{ .compatible = "fsl,vf610-edma", },
+	{ .compatible = "fsl,imx7ulp-edma", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids);
-- 
2.7.4