dmaengine: stm32: New directory for STM32 DMA controllers drivers

Gather the STM32 DMA controllers under drivers/dma/stm32/

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20240531150712.2503554-3-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 0 insertions, 402 deletions

diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c
deleted file mode 100644
index 8d77e2a7939a..000000000000
--- a/drivers/dma/stm32-dmamux.c
+++ /dev/null
@@ -1,402 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *
- * Copyright (C) STMicroelectronics SA 2017
- * Author(s): M'boumba Cedric Madianga <cedric.madianga@gmail.com>
- *            Pierre-Yves Mordret <pierre-yves.mordret@st.com>
- *
- * DMA Router driver for STM32 DMA MUX
- *
- * Based on TI DMA Crossbar driver
- */
-
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_dma.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/reset.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-
-#define STM32_DMAMUX_CCR(x)		(0x4 * (x))
-#define STM32_DMAMUX_MAX_DMA_REQUESTS	32
-#define STM32_DMAMUX_MAX_REQUESTS	255
-
-struct stm32_dmamux {
-	u32 master;
-	u32 request;
-	u32 chan_id;
-};
-
-struct stm32_dmamux_data {
-	struct dma_router dmarouter;
-	struct clk *clk;
-	void __iomem *iomem;
-	u32 dma_requests; /* Number of DMA requests connected to DMAMUX */
-	u32 dmamux_requests; /* Number of DMA requests routed toward DMAs */
-	spinlock_t lock; /* Protects register access */
-	DECLARE_BITMAP(dma_inuse, STM32_DMAMUX_MAX_DMA_REQUESTS); /* Used DMA channel */
-	u32 ccr[STM32_DMAMUX_MAX_DMA_REQUESTS]; /* Used to backup CCR register
-						 * in suspend
-						 */
-	u32 dma_reqs[]; /* Number of DMA Request per DMA masters.
-			 *  [0] holds number of DMA Masters.
-			 *  To be kept at very end of this structure
-			 */
-};
-
-static inline u32 stm32_dmamux_read(void __iomem *iomem, u32 reg)
-{
-	return readl_relaxed(iomem + reg);
-}
-
-static inline void stm32_dmamux_write(void __iomem *iomem, u32 reg, u32 val)
-{
-	writel_relaxed(val, iomem + reg);
-}
-
-static void stm32_dmamux_free(struct device *dev, void *route_data)
-{
-	struct stm32_dmamux_data *dmamux = dev_get_drvdata(dev);
-	struct stm32_dmamux *mux = route_data;
-	unsigned long flags;
-
-	/* Clear dma request */
-	spin_lock_irqsave(&dmamux->lock, flags);
-
-	stm32_dmamux_write(dmamux->iomem, STM32_DMAMUX_CCR(mux->chan_id), 0);
-	clear_bit(mux->chan_id, dmamux->dma_inuse);
-
-	pm_runtime_put_sync(dev);
-
-	spin_unlock_irqrestore(&dmamux->lock, flags);
-
-	dev_dbg(dev, "Unmapping DMAMUX(%u) to DMA%u(%u)\n",
-		mux->request, mux->master, mux->chan_id);
-
-	kfree(mux);
-}
-
-static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec,
-					 struct of_dma *ofdma)
-{
-	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
-	struct stm32_dmamux_data *dmamux = platform_get_drvdata(pdev);
-	struct stm32_dmamux *mux;
-	u32 i, min, max;
-	int ret;
-	unsigned long flags;
-
-	if (dma_spec->args_count != 3) {
-		dev_err(&pdev->dev, "invalid number of dma mux args\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	if (dma_spec->args[0] > dmamux->dmamux_requests) {
-		dev_err(&pdev->dev, "invalid mux request number: %d\n",
-			dma_spec->args[0]);
-		return ERR_PTR(-EINVAL);
-	}
-
-	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
-	if (!mux)
-		return ERR_PTR(-ENOMEM);
-
-	spin_lock_irqsave(&dmamux->lock, flags);
-	mux->chan_id = find_first_zero_bit(dmamux->dma_inuse,
-					   dmamux->dma_requests);
-
-	if (mux->chan_id == dmamux->dma_requests) {
-		spin_unlock_irqrestore(&dmamux->lock, flags);
-		dev_err(&pdev->dev, "Run out of free DMA requests\n");
-		ret = -ENOMEM;
-		goto error_chan_id;
-	}
-	set_bit(mux->chan_id, dmamux->dma_inuse);
-	spin_unlock_irqrestore(&dmamux->lock, flags);
-
-	/* Look for DMA Master */
-	for (i = 1, min = 0, max = dmamux->dma_reqs[i];
-	     i <= dmamux->dma_reqs[0];
-	     min += dmamux->dma_reqs[i], max += dmamux->dma_reqs[++i])
-		if (mux->chan_id < max)
-			break;
-	mux->master = i - 1;
-
-	/* The of_node_put() will be done in of_dma_router_xlate function */
-	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", i - 1);
-	if (!dma_spec->np) {
-		dev_err(&pdev->dev, "can't get dma master\n");
-		ret = -EINVAL;
-		goto error;
-	}
-
-	/* Set dma request */
-	spin_lock_irqsave(&dmamux->lock, flags);
-	ret = pm_runtime_resume_and_get(&pdev->dev);
-	if (ret < 0) {
-		spin_unlock_irqrestore(&dmamux->lock, flags);
-		goto error;
-	}
-	spin_unlock_irqrestore(&dmamux->lock, flags);
-
-	mux->request = dma_spec->args[0];
-
-	/*  craft DMA spec */
-	dma_spec->args[3] = dma_spec->args[2] | mux->chan_id << 16;
-	dma_spec->args[2] = dma_spec->args[1];
-	dma_spec->args[1] = 0;
-	dma_spec->args[0] = mux->chan_id - min;
-	dma_spec->args_count = 4;
-
-	stm32_dmamux_write(dmamux->iomem, STM32_DMAMUX_CCR(mux->chan_id),
-			   mux->request);
-	dev_dbg(&pdev->dev, "Mapping DMAMUX(%u) to DMA%u(%u)\n",
-		mux->request, mux->master, mux->chan_id);
-
-	return mux;
-
-error:
-	clear_bit(mux->chan_id, dmamux->dma_inuse);
-
-error_chan_id:
-	kfree(mux);
-	return ERR_PTR(ret);
-}
-
-static const struct of_device_id stm32_stm32dma_master_match[] __maybe_unused = {
-	{ .compatible = "st,stm32-dma", },
-	{},
-};
-
-static int stm32_dmamux_probe(struct platform_device *pdev)
-{
-	struct device_node *node = pdev->dev.of_node;
-	const struct of_device_id *match;
-	struct device_node *dma_node;
-	struct stm32_dmamux_data *stm32_dmamux;
-	void __iomem *iomem;
-	struct reset_control *rst;
-	int i, count, ret;
-	u32 dma_req;
-
-	if (!node)
-		return -ENODEV;
-
-	count = device_property_count_u32(&pdev->dev, "dma-masters");
-	if (count < 0) {
-		dev_err(&pdev->dev, "Can't get DMA master(s) node\n");
-		return -ENODEV;
-	}
-
-	stm32_dmamux = devm_kzalloc(&pdev->dev, sizeof(*stm32_dmamux) +
-				    sizeof(u32) * (count + 1), GFP_KERNEL);
-	if (!stm32_dmamux)
-		return -ENOMEM;
-
-	dma_req = 0;
-	for (i = 1; i <= count; i++) {
-		dma_node = of_parse_phandle(node, "dma-masters", i - 1);
-
-		match = of_match_node(stm32_stm32dma_master_match, dma_node);
-		if (!match) {
-			dev_err(&pdev->dev, "DMA master is not supported\n");
-			of_node_put(dma_node);
-			return -EINVAL;
-		}
-
-		if (of_property_read_u32(dma_node, "dma-requests",
-					 &stm32_dmamux->dma_reqs[i])) {
-			dev_info(&pdev->dev,
-				 "Missing MUX output information, using %u.\n",
-				 STM32_DMAMUX_MAX_DMA_REQUESTS);
-			stm32_dmamux->dma_reqs[i] =
-				STM32_DMAMUX_MAX_DMA_REQUESTS;
-		}
-		dma_req += stm32_dmamux->dma_reqs[i];
-		of_node_put(dma_node);
-	}
-
-	if (dma_req > STM32_DMAMUX_MAX_DMA_REQUESTS) {
-		dev_err(&pdev->dev, "Too many DMA Master Requests to manage\n");
-		return -ENODEV;
-	}
-
-	stm32_dmamux->dma_requests = dma_req;
-	stm32_dmamux->dma_reqs[0] = count;
-
-	if (device_property_read_u32(&pdev->dev, "dma-requests",
-				     &stm32_dmamux->dmamux_requests)) {
-		stm32_dmamux->dmamux_requests = STM32_DMAMUX_MAX_REQUESTS;
-		dev_warn(&pdev->dev, "DMAMUX defaulting on %u requests\n",
-			 stm32_dmamux->dmamux_requests);
-	}
-	pm_runtime_get_noresume(&pdev->dev);
-
-	iomem = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(iomem))
-		return PTR_ERR(iomem);
-
-	spin_lock_init(&stm32_dmamux->lock);
-
-	stm32_dmamux->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(stm32_dmamux->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(stm32_dmamux->clk),
-				     "Missing clock controller\n");
-
-	ret = clk_prepare_enable(stm32_dmamux->clk);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret);
-		return ret;
-	}
-
-	rst = devm_reset_control_get(&pdev->dev, NULL);
-	if (IS_ERR(rst)) {
-		ret = PTR_ERR(rst);
-		if (ret == -EPROBE_DEFER)
-			goto err_clk;
-	} else if (count > 1) { /* Don't reset if there is only one dma-master */
-		reset_control_assert(rst);
-		udelay(2);
-		reset_control_deassert(rst);
-	}
-
-	stm32_dmamux->iomem = iomem;
-	stm32_dmamux->dmarouter.dev = &pdev->dev;
-	stm32_dmamux->dmarouter.route_free = stm32_dmamux_free;
-
-	platform_set_drvdata(pdev, stm32_dmamux);
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
-
-	pm_runtime_get_noresume(&pdev->dev);
-
-	/* Reset the dmamux */
-	for (i = 0; i < stm32_dmamux->dma_requests; i++)
-		stm32_dmamux_write(stm32_dmamux->iomem, STM32_DMAMUX_CCR(i), 0);
-
-	pm_runtime_put(&pdev->dev);
-
-	ret = of_dma_router_register(node, stm32_dmamux_route_allocate,
-				     &stm32_dmamux->dmarouter);
-	if (ret)
-		goto pm_disable;
-
-	return 0;
-
-pm_disable:
-	pm_runtime_disable(&pdev->dev);
-err_clk:
-	clk_disable_unprepare(stm32_dmamux->clk);
-
-	return ret;
-}
-
-#ifdef CONFIG_PM
-static int stm32_dmamux_runtime_suspend(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
-
-	clk_disable_unprepare(stm32_dmamux->clk);
-
-	return 0;
-}
-
-static int stm32_dmamux_runtime_resume(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
-	int ret;
-
-	ret = clk_prepare_enable(stm32_dmamux->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to prepare_enable clock\n");
-		return ret;
-	}
-
-	return 0;
-}
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int stm32_dmamux_suspend(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
-	int i, ret;
-
-	ret = pm_runtime_resume_and_get(dev);
-	if (ret < 0)
-		return ret;
-
-	for (i = 0; i < stm32_dmamux->dma_requests; i++)
-		stm32_dmamux->ccr[i] = stm32_dmamux_read(stm32_dmamux->iomem,
-							 STM32_DMAMUX_CCR(i));
-
-	pm_runtime_put_sync(dev);
-
-	pm_runtime_force_suspend(dev);
-
-	return 0;
-}
-
-static int stm32_dmamux_resume(struct device *dev)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-	struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev);
-	int i, ret;
-
-	ret = pm_runtime_force_resume(dev);
-	if (ret < 0)
-		return ret;
-
-	ret = pm_runtime_resume_and_get(dev);
-	if (ret < 0)
-		return ret;
-
-	for (i = 0; i < stm32_dmamux->dma_requests; i++)
-		stm32_dmamux_write(stm32_dmamux->iomem, STM32_DMAMUX_CCR(i),
-				   stm32_dmamux->ccr[i]);
-
-	pm_runtime_put_sync(dev);
-
-	return 0;
-}
-#endif
-
-static const struct dev_pm_ops stm32_dmamux_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(stm32_dmamux_suspend, stm32_dmamux_resume)
-	SET_RUNTIME_PM_OPS(stm32_dmamux_runtime_suspend,
-			   stm32_dmamux_runtime_resume, NULL)
-};
-
-static const struct of_device_id stm32_dmamux_match[] = {
-	{ .compatible = "st,stm32h7-dmamux" },
-	{},
-};
-
-static struct platform_driver stm32_dmamux_driver = {
-	.probe	= stm32_dmamux_probe,
-	.driver = {
-		.name = "stm32-dmamux",
-		.of_match_table = stm32_dmamux_match,
-		.pm = &stm32_dmamux_pm_ops,
-	},
-};
-
-static int __init stm32_dmamux_init(void)
-{
-	return platform_driver_register(&stm32_dmamux_driver);
-}
-arch_initcall(stm32_dmamux_init);
-
-MODULE_DESCRIPTION("DMA Router driver for STM32 DMA MUX");
-MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
-MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");