dmaengine: ti: New directory for Texas Instruments DMA drivers

Collect the Texas Instruments DMA drivers under drivers/dma/ti/

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 0 insertions, 478 deletions

diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c
deleted file mode 100644
index 9272b173c746..000000000000
--- a/drivers/dma/ti-dma-crossbar.c
+++ /dev/null
@@ -1,478 +0,0 @@
-/*
- *  Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
- *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/list.h>
-#include <linux/io.h>
-#include <linux/of_address.h>
-#include <linux/of_device.h>
-#include <linux/of_dma.h>
-
-#define TI_XBAR_DRA7		0
-#define TI_XBAR_AM335X		1
-static const u32 ti_xbar_type[] = {
-	[TI_XBAR_DRA7] = TI_XBAR_DRA7,
-	[TI_XBAR_AM335X] = TI_XBAR_AM335X,
-};
-
-static const struct of_device_id ti_dma_xbar_match[] = {
-	{
-		.compatible = "ti,dra7-dma-crossbar",
-		.data = &ti_xbar_type[TI_XBAR_DRA7],
-	},
-	{
-		.compatible = "ti,am335x-edma-crossbar",
-		.data = &ti_xbar_type[TI_XBAR_AM335X],
-	},
-	{},
-};
-
-/* Crossbar on AM335x/AM437x family */
-#define TI_AM335X_XBAR_LINES	64
-
-struct ti_am335x_xbar_data {
-	void __iomem *iomem;
-
-	struct dma_router dmarouter;
-
-	u32 xbar_events; /* maximum number of events to select in xbar */
-	u32 dma_requests; /* number of DMA requests on eDMA */
-};
-
-struct ti_am335x_xbar_map {
-	u16 dma_line;
-	u8 mux_val;
-};
-
-static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8 val)
-{
-	/*
-	 * TPCC_EVT_MUX_60_63 register layout is different than the
-	 * rest, in the sense, that event 63 is mapped to lowest byte
-	 * and event 60 is mapped to highest, handle it separately.
-	 */
-	if (event >= 60 && event <= 63)
-		writeb_relaxed(val, iomem + (63 - event % 4));
-	else
-		writeb_relaxed(val, iomem + event);
-}
-
-static void ti_am335x_xbar_free(struct device *dev, void *route_data)
-{
-	struct ti_am335x_xbar_data *xbar = dev_get_drvdata(dev);
-	struct ti_am335x_xbar_map *map = route_data;
-
-	dev_dbg(dev, "Unmapping XBAR event %u on channel %u\n",
-		map->mux_val, map->dma_line);
-
-	ti_am335x_xbar_write(xbar->iomem, map->dma_line, 0);
-	kfree(map);
-}
-
-static void *ti_am335x_xbar_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 ti_am335x_xbar_data *xbar = platform_get_drvdata(pdev);
-	struct ti_am335x_xbar_map *map;
-
-	if (dma_spec->args_count != 3)
-		return ERR_PTR(-EINVAL);
-
-	if (dma_spec->args[2] >= xbar->xbar_events) {
-		dev_err(&pdev->dev, "Invalid XBAR event number: %d\n",
-			dma_spec->args[2]);
-		return ERR_PTR(-EINVAL);
-	}
-
-	if (dma_spec->args[0] >= xbar->dma_requests) {
-		dev_err(&pdev->dev, "Invalid DMA request line number: %d\n",
-			dma_spec->args[0]);
-		return ERR_PTR(-EINVAL);
-	}
-
-	/* The of_node_put() will be done in the core for the node */
-	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
-	if (!dma_spec->np) {
-		dev_err(&pdev->dev, "Can't get DMA master\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	map = kzalloc(sizeof(*map), GFP_KERNEL);
-	if (!map) {
-		of_node_put(dma_spec->np);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	map->dma_line = (u16)dma_spec->args[0];
-	map->mux_val = (u8)dma_spec->args[2];
-
-	dma_spec->args[2] = 0;
-	dma_spec->args_count = 2;
-
-	dev_dbg(&pdev->dev, "Mapping XBAR event%u to DMA%u\n",
-		map->mux_val, map->dma_line);
-
-	ti_am335x_xbar_write(xbar->iomem, map->dma_line, map->mux_val);
-
-	return map;
-}
-
-static const struct of_device_id ti_am335x_master_match[] = {
-	{ .compatible = "ti,edma3-tpcc", },
-	{},
-};
-
-static int ti_am335x_xbar_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 ti_am335x_xbar_data *xbar;
-	struct resource *res;
-	void __iomem *iomem;
-	int i, ret;
-
-	if (!node)
-		return -ENODEV;
-
-	xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
-	if (!xbar)
-		return -ENOMEM;
-
-	dma_node = of_parse_phandle(node, "dma-masters", 0);
-	if (!dma_node) {
-		dev_err(&pdev->dev, "Can't get DMA master node\n");
-		return -ENODEV;
-	}
-
-	match = of_match_node(ti_am335x_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",
-				 &xbar->dma_requests)) {
-		dev_info(&pdev->dev,
-			 "Missing XBAR output information, using %u.\n",
-			 TI_AM335X_XBAR_LINES);
-		xbar->dma_requests = TI_AM335X_XBAR_LINES;
-	}
-	of_node_put(dma_node);
-
-	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_events)) {
-		dev_info(&pdev->dev,
-			 "Missing XBAR input information, using %u.\n",
-			 TI_AM335X_XBAR_LINES);
-		xbar->xbar_events = TI_AM335X_XBAR_LINES;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	iomem = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(iomem))
-		return PTR_ERR(iomem);
-
-	xbar->iomem = iomem;
-
-	xbar->dmarouter.dev = &pdev->dev;
-	xbar->dmarouter.route_free = ti_am335x_xbar_free;
-
-	platform_set_drvdata(pdev, xbar);
-
-	/* Reset the crossbar */
-	for (i = 0; i < xbar->dma_requests; i++)
-		ti_am335x_xbar_write(xbar->iomem, i, 0);
-
-	ret = of_dma_router_register(node, ti_am335x_xbar_route_allocate,
-				     &xbar->dmarouter);
-
-	return ret;
-}
-
-/* Crossbar on DRA7xx family */
-#define TI_DRA7_XBAR_OUTPUTS	127
-#define TI_DRA7_XBAR_INPUTS	256
-
-struct ti_dra7_xbar_data {
-	void __iomem *iomem;
-
-	struct dma_router dmarouter;
-	struct mutex mutex;
-	unsigned long *dma_inuse;
-
-	u16 safe_val; /* Value to rest the crossbar lines */
-	u32 xbar_requests; /* number of DMA requests connected to XBAR */
-	u32 dma_requests; /* number of DMA requests forwarded to DMA */
-	u32 dma_offset;
-};
-
-struct ti_dra7_xbar_map {
-	u16 xbar_in;
-	int xbar_out;
-};
-
-static inline void ti_dra7_xbar_write(void __iomem *iomem, int xbar, u16 val)
-{
-	writew_relaxed(val, iomem + (xbar * 2));
-}
-
-static void ti_dra7_xbar_free(struct device *dev, void *route_data)
-{
-	struct ti_dra7_xbar_data *xbar = dev_get_drvdata(dev);
-	struct ti_dra7_xbar_map *map = route_data;
-
-	dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
-		map->xbar_in, map->xbar_out);
-
-	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
-	mutex_lock(&xbar->mutex);
-	clear_bit(map->xbar_out, xbar->dma_inuse);
-	mutex_unlock(&xbar->mutex);
-	kfree(map);
-}
-
-static void *ti_dra7_xbar_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 ti_dra7_xbar_data *xbar = platform_get_drvdata(pdev);
-	struct ti_dra7_xbar_map *map;
-
-	if (dma_spec->args[0] >= xbar->xbar_requests) {
-		dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
-			dma_spec->args[0]);
-		return ERR_PTR(-EINVAL);
-	}
-
-	/* The of_node_put() will be done in the core for the node */
-	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
-	if (!dma_spec->np) {
-		dev_err(&pdev->dev, "Can't get DMA master\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	map = kzalloc(sizeof(*map), GFP_KERNEL);
-	if (!map) {
-		of_node_put(dma_spec->np);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	mutex_lock(&xbar->mutex);
-	map->xbar_out = find_first_zero_bit(xbar->dma_inuse,
-					    xbar->dma_requests);
-	if (map->xbar_out == xbar->dma_requests) {
-		mutex_unlock(&xbar->mutex);
-		dev_err(&pdev->dev, "Run out of free DMA requests\n");
-		kfree(map);
-		return ERR_PTR(-ENOMEM);
-	}
-	set_bit(map->xbar_out, xbar->dma_inuse);
-	mutex_unlock(&xbar->mutex);
-
-	map->xbar_in = (u16)dma_spec->args[0];
-
-	dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
-
-	dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
-		map->xbar_in, map->xbar_out);
-
-	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
-
-	return map;
-}
-
-#define TI_XBAR_EDMA_OFFSET	0
-#define TI_XBAR_SDMA_OFFSET	1
-static const u32 ti_dma_offset[] = {
-	[TI_XBAR_EDMA_OFFSET] = 0,
-	[TI_XBAR_SDMA_OFFSET] = 1,
-};
-
-static const struct of_device_id ti_dra7_master_match[] = {
-	{
-		.compatible = "ti,omap4430-sdma",
-		.data = &ti_dma_offset[TI_XBAR_SDMA_OFFSET],
-	},
-	{
-		.compatible = "ti,edma3",
-		.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
-	},
-	{
-		.compatible = "ti,edma3-tpcc",
-		.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
-	},
-	{},
-};
-
-static inline void ti_dra7_xbar_reserve(int offset, int len, unsigned long *p)
-{
-	for (; len > 0; len--)
-		set_bit(offset + (len - 1), p);
-}
-
-static int ti_dra7_xbar_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 ti_dra7_xbar_data *xbar;
-	struct property *prop;
-	struct resource *res;
-	u32 safe_val;
-	int sz;
-	void __iomem *iomem;
-	int i, ret;
-
-	if (!node)
-		return -ENODEV;
-
-	xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
-	if (!xbar)
-		return -ENOMEM;
-
-	dma_node = of_parse_phandle(node, "dma-masters", 0);
-	if (!dma_node) {
-		dev_err(&pdev->dev, "Can't get DMA master node\n");
-		return -ENODEV;
-	}
-
-	match = of_match_node(ti_dra7_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",
-				 &xbar->dma_requests)) {
-		dev_info(&pdev->dev,
-			 "Missing XBAR output information, using %u.\n",
-			 TI_DRA7_XBAR_OUTPUTS);
-		xbar->dma_requests = TI_DRA7_XBAR_OUTPUTS;
-	}
-	of_node_put(dma_node);
-
-	xbar->dma_inuse = devm_kcalloc(&pdev->dev,
-				       BITS_TO_LONGS(xbar->dma_requests),
-				       sizeof(unsigned long), GFP_KERNEL);
-	if (!xbar->dma_inuse)
-		return -ENOMEM;
-
-	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
-		dev_info(&pdev->dev,
-			 "Missing XBAR input information, using %u.\n",
-			 TI_DRA7_XBAR_INPUTS);
-		xbar->xbar_requests = TI_DRA7_XBAR_INPUTS;
-	}
-
-	if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
-		xbar->safe_val = (u16)safe_val;
-
-
-	prop = of_find_property(node, "ti,reserved-dma-request-ranges", &sz);
-	if (prop) {
-		const char pname[] = "ti,reserved-dma-request-ranges";
-		u32 (*rsv_events)[2];
-		size_t nelm = sz / sizeof(*rsv_events);
-		int i;
-
-		if (!nelm)
-			return -EINVAL;
-
-		rsv_events = kcalloc(nelm, sizeof(*rsv_events), GFP_KERNEL);
-		if (!rsv_events)
-			return -ENOMEM;
-
-		ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events,
-						 nelm * 2);
-		if (ret)
-			return ret;
-
-		for (i = 0; i < nelm; i++) {
-			ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1],
-					     xbar->dma_inuse);
-		}
-		kfree(rsv_events);
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	iomem = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(iomem))
-		return PTR_ERR(iomem);
-
-	xbar->iomem = iomem;
-
-	xbar->dmarouter.dev = &pdev->dev;
-	xbar->dmarouter.route_free = ti_dra7_xbar_free;
-	xbar->dma_offset = *(u32 *)match->data;
-
-	mutex_init(&xbar->mutex);
-	platform_set_drvdata(pdev, xbar);
-
-	/* Reset the crossbar */
-	for (i = 0; i < xbar->dma_requests; i++) {
-		if (!test_bit(i, xbar->dma_inuse))
-			ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val);
-	}
-
-	ret = of_dma_router_register(node, ti_dra7_xbar_route_allocate,
-				     &xbar->dmarouter);
-	if (ret) {
-		/* Restore the defaults for the crossbar */
-		for (i = 0; i < xbar->dma_requests; i++) {
-			if (!test_bit(i, xbar->dma_inuse))
-				ti_dra7_xbar_write(xbar->iomem, i, i);
-		}
-	}
-
-	return ret;
-}
-
-static int ti_dma_xbar_probe(struct platform_device *pdev)
-{
-	const struct of_device_id *match;
-	int ret;
-
-	match = of_match_node(ti_dma_xbar_match, pdev->dev.of_node);
-	if (unlikely(!match))
-		return -EINVAL;
-
-	switch (*(u32 *)match->data) {
-	case TI_XBAR_DRA7:
-		ret = ti_dra7_xbar_probe(pdev);
-		break;
-	case TI_XBAR_AM335X:
-		ret = ti_am335x_xbar_probe(pdev);
-		break;
-	default:
-		dev_err(&pdev->dev, "Unsupported crossbar\n");
-		ret = -ENODEV;
-		break;
-	}
-
-	return ret;
-}
-
-static struct platform_driver ti_dma_xbar_driver = {
-	.driver = {
-		.name = "ti-dma-crossbar",
-		.of_match_table = of_match_ptr(ti_dma_xbar_match),
-	},
-	.probe	= ti_dma_xbar_probe,
-};
-
-static int omap_dmaxbar_init(void)
-{
-	return platform_driver_register(&ti_dma_xbar_driver);
-}
-arch_initcall(omap_dmaxbar_init);