add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/imx-dma.c
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@@ -162,6 +162,7 @@
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 	bool				enabled_2d;
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 	int				slot_2d;
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 	unsigned int			irq;
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+	struct dma_slave_config		config;
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 };
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 enum imx_dma_type {
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@@ -172,7 +173,6 @@
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 struct imxdma_engine {
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 	struct device			*dev;
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-	struct device_dma_parameters	dma_parms;
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 	struct dma_device		dma_device;
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 	void __iomem			*base;
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 	struct clk			*dma_ahb;
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@@ -277,12 +277,12 @@
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 /*
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  * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation
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  */
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-static inline int imxdma_sg_next(struct imxdma_desc *d)
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+static inline void imxdma_sg_next(struct imxdma_desc *d)
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 {
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 	struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan);
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 	struct imxdma_engine *imxdma = imxdmac->imxdma;
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 	struct scatterlist *sg = d->sg;
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-	unsigned long now;
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+	size_t now;
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 	now = min_t(size_t, d->len, sg_dma_len(sg));
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 	if (d->len != IMX_DMA_LENGTH_LOOP)
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@@ -302,8 +302,6 @@
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 		 imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)),
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 		 imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)),
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 		 imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel)));
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-
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-	return now;
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 }
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 static void imxdma_enable_hw(struct imxdma_desc *d)
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@@ -557,6 +555,7 @@
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 		 * We fall-through here intentionally, since a 2D transfer is
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 		 * similar to MEMCPY just adding the 2D slot configuration.
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 		 */
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+		fallthrough;
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 	case IMXDMA_DESC_MEMCPY:
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 		imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel));
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 		imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel));
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@@ -613,9 +612,9 @@
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 	return 0;
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 }
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-static void imxdma_tasklet(unsigned long data)
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+static void imxdma_tasklet(struct tasklet_struct *t)
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 {
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-	struct imxdma_channel *imxdmac = (void *)data;
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+	struct imxdma_channel *imxdmac = from_tasklet(imxdmac, t, dma_tasklet);
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 	struct imxdma_engine *imxdma = imxdmac->imxdma;
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 	struct imxdma_desc *desc, *next_desc;
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 	unsigned long flags;
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@@ -675,14 +674,15 @@
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 	return 0;
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 }
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-static int imxdma_config(struct dma_chan *chan,
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-			 struct dma_slave_config *dmaengine_cfg)
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+static int imxdma_config_write(struct dma_chan *chan,
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+			       struct dma_slave_config *dmaengine_cfg,
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+			       enum dma_transfer_direction direction)
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 {
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 	struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
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 	struct imxdma_engine *imxdma = imxdmac->imxdma;
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 	unsigned int mode = 0;
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-	if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
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+	if (direction == DMA_DEV_TO_MEM) {
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 		imxdmac->per_address = dmaengine_cfg->src_addr;
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 		imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
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 		imxdmac->word_size = dmaengine_cfg->src_addr_width;
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@@ -719,6 +719,16 @@
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 	/* Set burst length */
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 	imx_dmav1_writel(imxdma, imxdmac->watermark_level *
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 			 imxdmac->word_size, DMA_BLR(imxdmac->channel));
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+
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+	return 0;
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+}
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+
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+static int imxdma_config(struct dma_chan *chan,
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+			 struct dma_slave_config *dmaengine_cfg)
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+{
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+	struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
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+
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+	memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
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 	return 0;
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 }
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@@ -821,6 +831,8 @@
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 		dma_length += sg_dma_len(sg);
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 	}
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+	imxdma_config_write(chan, &imxdmac->config, direction);
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+
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 	switch (imxdmac->word_size) {
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 	case DMA_SLAVE_BUSWIDTH_4_BYTES:
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 		if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
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@@ -904,6 +916,8 @@
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 	}
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 	desc->desc.callback = NULL;
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 	desc->desc.callback_param = NULL;
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+
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+	imxdma_config_write(chan, &imxdmac->config, direction);
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 	return &desc->desc;
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 }
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@@ -1156,8 +1170,7 @@
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 		INIT_LIST_HEAD(&imxdmac->ld_free);
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 		INIT_LIST_HEAD(&imxdmac->ld_active);
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-		tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet,
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-			     (unsigned long)imxdmac);
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+		tasklet_setup(&imxdmac->dma_tasklet, imxdma_tasklet);
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 		imxdmac->chan.device = &imxdma->dma_device;
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 		dma_cookie_init(&imxdmac->chan);
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 		imxdmac->channel = i;
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@@ -1183,7 +1196,6 @@
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 	platform_set_drvdata(pdev, imxdma);
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 	imxdma->dma_device.copy_align = DMAENGINE_ALIGN_4_BYTES;
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-	imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms;
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 	dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff);
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 	ret = dma_async_device_register(&imxdma->dma_device);