dmaengine: fsl-edma: add address for channel mux register in fsl_edma_chan

iMX95 move channel mux register to management page address space. This
prepare to support iMX95.

Add mux_addr in struct fsl_edma_chan. No function change.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231221153528.1588049-4-Frank.Li@nxp.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-edma-common.c

@@ -97,8 +97,8 @@ static void fsl_edma3_enable_request(struct fsl_edma_chan *fsl_chan)
 		 * ch_mux: With the exception of 0, attempts to write a value
 		 * already in use will be forced to 0.
 		 */
-		if (!edma_readl_chreg(fsl_chan, ch_mux))
-			edma_writel_chreg(fsl_chan, fsl_chan->srcid, ch_mux);
+		if (!edma_readl(fsl_chan->edma, fsl_chan->mux_addr))
+			edma_writel(fsl_chan->edma, fsl_chan->srcid, fsl_chan->mux_addr);
 	}
 
 	val = edma_readl_chreg(fsl_chan, ch_csr);
@@ -134,7 +134,7 @@ static void fsl_edma3_disable_request(struct fsl_edma_chan *fsl_chan)
 	flags = fsl_edma_drvflags(fsl_chan);
 
 	if (flags & FSL_EDMA_DRV_HAS_CHMUX)
-		edma_writel_chreg(fsl_chan, 0, ch_mux);
+		edma_writel(fsl_chan->edma, 0, fsl_chan->mux_addr);
 
 	val &= ~EDMA_V3_CH_CSR_ERQ;
 	edma_writel_chreg(fsl_chan, val, ch_csr);

drivers/dma/fsl-edma-common.h

@@ -145,6 +145,7 @@ struct fsl_edma_chan {
 	enum dma_data_direction		dma_dir;
 	char				chan_name[32];
 	struct fsl_edma_hw_tcd __iomem *tcd;
+	void __iomem			*mux_addr;
 	u32				real_count;
 	struct work_struct		issue_worker;
 	struct platform_device		*pdev;
@@ -206,6 +207,8 @@ struct fsl_edma_drvdata {
 	u32			chreg_off;
 	u32			chreg_space_sz;
 	u32			flags;
+	u32			mux_off;	/* channel mux register offset */
+	u32			mux_skip;	/* how much skip for each channel */
 	int			(*setup_irq)(struct platform_device *pdev,
 					     struct fsl_edma_engine *fsl_edma);
 };

drivers/dma/fsl-edma-main.c

@@ -359,6 +359,8 @@ static struct fsl_edma_drvdata imx93_data4 = {
 	.flags = FSL_EDMA_DRV_HAS_CHMUX | FSL_EDMA_DRV_HAS_DMACLK | FSL_EDMA_DRV_EDMA4,
 	.chreg_space_sz = 0x8000,
 	.chreg_off = 0x10000,
+	.mux_off = 0x10000 + offsetof(struct fsl_edma3_ch_reg, ch_mux),
+	.mux_skip = 0x8000,
 	.setup_irq = fsl_edma3_irq_init,
 };
 
@@ -532,6 +534,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
 				offsetof(struct fsl_edma3_ch_reg, tcd) : 0;
 		fsl_chan->tcd = fsl_edma->membase
 				+ i * drvdata->chreg_space_sz + drvdata->chreg_off + len;
+		fsl_chan->mux_addr = fsl_edma->membase + drvdata->mux_off + i * drvdata->mux_skip;
 
 		fsl_chan->pdev = pdev;
 		vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);