add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/txx9dmac.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Driver for the TXx9 SoC DMA Controller
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  *
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  * Copyright (C) 2009 Atsushi Nemoto
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/dma-mapping.h>
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 #include <linux/init.h>
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@@ -327,7 +324,6 @@
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 	channel_writel(dc, SAIR, 0);
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 	channel_writel(dc, DAIR, 0);
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 	channel_writel(dc, CCR, 0);
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-	mmiowb();
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 }
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 /* Called with dc->lock held and bh disabled */
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@@ -605,13 +601,13 @@
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 	}
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 }
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-static void txx9dmac_chan_tasklet(unsigned long data)
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+static void txx9dmac_chan_tasklet(struct tasklet_struct *t)
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 {
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 	int irq;
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 	u32 csr;
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 	struct txx9dmac_chan *dc;
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-	dc = (struct txx9dmac_chan *)data;
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+	dc = from_tasklet(dc, t, tasklet);
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 	csr = channel_readl(dc, CSR);
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 	dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr);
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@@ -642,13 +638,13 @@
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 	return IRQ_HANDLED;
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 }
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-static void txx9dmac_tasklet(unsigned long data)
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+static void txx9dmac_tasklet(struct tasklet_struct *t)
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 {
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 	int irq;
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 	u32 csr;
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 	struct txx9dmac_chan *dc;
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-	struct txx9dmac_dev *ddev = (struct txx9dmac_dev *)data;
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+	struct txx9dmac_dev *ddev = from_tasklet(ddev, t, tasklet);
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 	u32 mcr;
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 	int i;
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@@ -954,7 +950,6 @@
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 	dma_sync_single_for_device(chan2parent(&dc->chan),
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 				   prev->txd.phys, ddev->descsize,
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 				   DMA_TO_DEVICE);
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-	mmiowb();
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 	if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) &&
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 	    channel_read_CHAR(dc) == prev->txd.phys)
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 		/* Restart chain DMA */
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@@ -1080,7 +1075,6 @@
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 static void txx9dmac_off(struct txx9dmac_dev *ddev)
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 {
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 	dma_writel(ddev, MCR, 0);
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-	mmiowb();
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 }
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 static int __init txx9dmac_chan_probe(struct platform_device *pdev)
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@@ -1119,8 +1113,7 @@
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 		irq = platform_get_irq(pdev, 0);
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 		if (irq < 0)
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 			return irq;
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-		tasklet_init(&dc->tasklet, txx9dmac_chan_tasklet,
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-				(unsigned long)dc);
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+		tasklet_setup(&dc->tasklet, txx9dmac_chan_tasklet);
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 		dc->irq = irq;
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 		err = devm_request_irq(&pdev->dev, dc->irq,
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 			txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc);
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@@ -1206,8 +1199,7 @@
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 	ddev->irq = platform_get_irq(pdev, 0);
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 	if (ddev->irq >= 0) {
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-		tasklet_init(&ddev->tasklet, txx9dmac_tasklet,
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-				(unsigned long)ddev);
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+		tasklet_setup(&ddev->tasklet, txx9dmac_tasklet);
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 		err = devm_request_irq(&pdev->dev, ddev->irq,
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 			txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev);
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 		if (err)