[linux-2.6-block.git] / drivers / dma / ti-dma-crossbar.c

/*
 *  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)
{
	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);
Commit	Line	Data
a074ae38 PU	1	/*
	2	* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
	3	* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	*/
	10	#include <linux/slab.h>
	11	#include <linux/err.h>
	12	#include <linux/init.h>
	13	#include <linux/list.h>
	14	#include <linux/io.h>
a074ae38 PU	15	#include <linux/of_address.h>
	16	#include <linux/of_device.h>
	17	#include <linux/of_dma.h>
	18
42dbdcc6 PU	19	#define TI_XBAR_DRA7 0
42dbdcc6 PU	20	#define TI_XBAR_AM335X 1
5f9367a8 PU	21	static const u32 ti_xbar_type[] = {
	22	[TI_XBAR_DRA7] = TI_XBAR_DRA7,
	23	[TI_XBAR_AM335X] = TI_XBAR_AM335X,
	24	};
42dbdcc6 PU	25
	26	static const struct of_device_id ti_dma_xbar_match[] = {
	27	{
	28	.compatible = "ti,dra7-dma-crossbar",
5f9367a8	29	.data = &ti_xbar_type[TI_XBAR_DRA7],
42dbdcc6 PU	30	},
	31	{
	32	.compatible = "ti,am335x-edma-crossbar",
5f9367a8	33	.data = &ti_xbar_type[TI_XBAR_AM335X],
42dbdcc6 PU	34	},
	35	{},
	36	};
	37
	38	/* Crossbar on AM335x/AM437x family */
	39	#define TI_AM335X_XBAR_LINES 64
	40
	41	struct ti_am335x_xbar_data {
	42	void __iomem *iomem;
	43
	44	struct dma_router dmarouter;
	45
	46	u32 xbar_events; /* maximum number of events to select in xbar */
	47	u32 dma_requests; /* number of DMA requests on eDMA */
	48	};
	49
	50	struct ti_am335x_xbar_map {
	51	u16 dma_line;
288e7560	52	u8 mux_val;
42dbdcc6 PU	53	};
42dbdcc6 PU	54
288e7560	55	static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8 val)
42dbdcc6	56	{
288e7560	57	writeb_relaxed(val, iomem + event);
42dbdcc6 PU	58	}
	59
	60	static void ti_am335x_xbar_free(struct device dev, void route_data)
	61	{
	62	struct ti_am335x_xbar_data *xbar = dev_get_drvdata(dev);
	63	struct ti_am335x_xbar_map *map = route_data;
	64
	65	dev_dbg(dev, "Unmapping XBAR event %u on channel %u\n",
	66	map->mux_val, map->dma_line);
	67
	68	ti_am335x_xbar_write(xbar->iomem, map->dma_line, 0);
	69	kfree(map);
	70	}
	71
	72	static void ti_am335x_xbar_route_allocate(struct of_phandle_args dma_spec,
	73	struct of_dma *ofdma)
	74	{
	75	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
	76	struct ti_am335x_xbar_data *xbar = platform_get_drvdata(pdev);
	77	struct ti_am335x_xbar_map *map;
	78
	79	if (dma_spec->args_count != 3)
	80	return ERR_PTR(-EINVAL);
	81
	82	if (dma_spec->args[2] >= xbar->xbar_events) {
	83	dev_err(&pdev->dev, "Invalid XBAR event number: %d\n",
	84	dma_spec->args[2]);
	85	return ERR_PTR(-EINVAL);
	86	}
	87
	88	if (dma_spec->args[0] >= xbar->dma_requests) {
	89	dev_err(&pdev->dev, "Invalid DMA request line number: %d\n",
	90	dma_spec->args[0]);
	91	return ERR_PTR(-EINVAL);
	92	}
	93
	94	/* The of_node_put() will be done in the core for the node */
	95	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
	96	if (!dma_spec->np) {
	97	dev_err(&pdev->dev, "Can't get DMA master\n");
	98	return ERR_PTR(-EINVAL);
	99	}
	100
	101	map = kzalloc(sizeof(*map), GFP_KERNEL);
	102	if (!map) {
	103	of_node_put(dma_spec->np);
	104	return ERR_PTR(-ENOMEM);
	105	}
	106
	107	map->dma_line = (u16)dma_spec->args[0];
288e7560	108	map->mux_val = (u8)dma_spec->args[2];
42dbdcc6 PU	109
	110	dma_spec->args[2] = 0;
	111	dma_spec->args_count = 2;
	112
	113	dev_dbg(&pdev->dev, "Mapping XBAR event%u to DMA%u\n",
	114	map->mux_val, map->dma_line);
	115
	116	ti_am335x_xbar_write(xbar->iomem, map->dma_line, map->mux_val);
	117
	118	return map;
	119	}
	120
	121	static const struct of_device_id ti_am335x_master_match[] = {
	122	{ .compatible = "ti,edma3-tpcc", },
	123	{},
	124	};
	125
	126	static int ti_am335x_xbar_probe(struct platform_device *pdev)
	127	{
	128	struct device_node *node = pdev->dev.of_node;
	129	const struct of_device_id *match;
	130	struct device_node *dma_node;
	131	struct ti_am335x_xbar_data *xbar;
	132	struct resource *res;
	133	void __iomem *iomem;
	134	int i, ret;
	135
	136	if (!node)
	137	return -ENODEV;
	138
	139	xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
	140	if (!xbar)
	141	return -ENOMEM;
	142
	143	dma_node = of_parse_phandle(node, "dma-masters", 0);
	144	if (!dma_node) {
	145	dev_err(&pdev->dev, "Can't get DMA master node\n");
	146	return -ENODEV;
	147	}
	148
	149	match = of_match_node(ti_am335x_master_match, dma_node);
	150	if (!match) {
	151	dev_err(&pdev->dev, "DMA master is not supported\n");
75bdc7f3	152	of_node_put(dma_node);
42dbdcc6 PU	153	return -EINVAL;
	154	}
	155
	156	if (of_property_read_u32(dma_node, "dma-requests",
	157	&xbar->dma_requests)) {
	158	dev_info(&pdev->dev,
	159	"Missing XBAR output information, using %u.\n",
	160	TI_AM335X_XBAR_LINES);
	161	xbar->dma_requests = TI_AM335X_XBAR_LINES;
	162	}
	163	of_node_put(dma_node);
	164
	165	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_events)) {
	166	dev_info(&pdev->dev,
	167	"Missing XBAR input information, using %u.\n",
	168	TI_AM335X_XBAR_LINES);
	169	xbar->xbar_events = TI_AM335X_XBAR_LINES;
	170	}
	171
	172	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	173	iomem = devm_ioremap_resource(&pdev->dev, res);
	174	if (IS_ERR(iomem))
	175	return PTR_ERR(iomem);
	176
	177	xbar->iomem = iomem;
	178
	179	xbar->dmarouter.dev = &pdev->dev;
	180	xbar->dmarouter.route_free = ti_am335x_xbar_free;
	181
	182	platform_set_drvdata(pdev, xbar);
	183
	184	/* Reset the crossbar */
	185	for (i = 0; i < xbar->dma_requests; i++)
	186	ti_am335x_xbar_write(xbar->iomem, i, 0);
	187
	188	ret = of_dma_router_register(node, ti_am335x_xbar_route_allocate,
	189	&xbar->dmarouter);
	190
	191	return ret;
	192	}
	193
	194	/* Crossbar on DRA7xx family */
	195	#define TI_DRA7_XBAR_OUTPUTS 127
	196	#define TI_DRA7_XBAR_INPUTS 256
a074ae38	197
42dbdcc6	198	struct ti_dra7_xbar_data {
a074ae38 PU	199	void __iomem *iomem;
	200
	201	struct dma_router dmarouter;
ec9bfa1e PU	202	struct mutex mutex;
ec9bfa1e PU	203	unsigned long *dma_inuse;
a074ae38 PU	204
	205	u16 safe_val; /* Value to rest the crossbar lines */
	206	u32 xbar_requests; /* number of DMA requests connected to XBAR */
	207	u32 dma_requests; /* number of DMA requests forwarded to DMA */
1eb995bb	208	u32 dma_offset;
a074ae38 PU	209	};
a074ae38 PU	210
42dbdcc6	211	struct ti_dra7_xbar_map {
a074ae38 PU	212	u16 xbar_in;
	213	int xbar_out;
	214	};
	215
42dbdcc6	216	static inline void ti_dra7_xbar_write(void __iomem *iomem, int xbar, u16 val)
a074ae38 PU	217	{
	218	writew_relaxed(val, iomem + (xbar * 2));
	219	}
	220
42dbdcc6	221	static void ti_dra7_xbar_free(struct device dev, void route_data)
a074ae38	222	{
42dbdcc6 PU	223	struct ti_dra7_xbar_data *xbar = dev_get_drvdata(dev);
42dbdcc6 PU	224	struct ti_dra7_xbar_map *map = route_data;
a074ae38 PU	225
	226	dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
	227	map->xbar_in, map->xbar_out);
	228
42dbdcc6	229	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
ec9bfa1e PU	230	mutex_lock(&xbar->mutex);
	231	clear_bit(map->xbar_out, xbar->dma_inuse);
	232	mutex_unlock(&xbar->mutex);
a074ae38 PU	233	kfree(map);
	234	}
	235
42dbdcc6 PU	236	static void ti_dra7_xbar_route_allocate(struct of_phandle_args dma_spec,
42dbdcc6 PU	237	struct of_dma *ofdma)
a074ae38 PU	238	{
a074ae38 PU	239	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
42dbdcc6 PU	240	struct ti_dra7_xbar_data *xbar = platform_get_drvdata(pdev);
42dbdcc6 PU	241	struct ti_dra7_xbar_map *map;
a074ae38 PU	242
	243	if (dma_spec->args[0] >= xbar->xbar_requests) {
	244	dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
	245	dma_spec->args[0]);
	246	return ERR_PTR(-EINVAL);
	247	}
	248
	249	/* The of_node_put() will be done in the core for the node */
	250	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
	251	if (!dma_spec->np) {
	252	dev_err(&pdev->dev, "Can't get DMA master\n");
	253	return ERR_PTR(-EINVAL);
	254	}
	255
	256	map = kzalloc(sizeof(*map), GFP_KERNEL);
	257	if (!map) {
	258	of_node_put(dma_spec->np);
	259	return ERR_PTR(-ENOMEM);
	260	}
	261
ec9bfa1e PU	262	mutex_lock(&xbar->mutex);
	263	map->xbar_out = find_first_zero_bit(xbar->dma_inuse,
	264	xbar->dma_requests);
ec9bfa1e	265	if (map->xbar_out == xbar->dma_requests) {
2ccb4837	266	mutex_unlock(&xbar->mutex);
ec9bfa1e PU	267	dev_err(&pdev->dev, "Run out of free DMA requests\n");
	268	kfree(map);
	269	return ERR_PTR(-ENOMEM);
	270	}
	271	set_bit(map->xbar_out, xbar->dma_inuse);
2ccb4837	272	mutex_unlock(&xbar->mutex);
ec9bfa1e	273
a074ae38 PU	274	map->xbar_in = (u16)dma_spec->args[0];
a074ae38 PU	275
1eb995bb	276	dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
a074ae38 PU	277
	278	dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
	279	map->xbar_in, map->xbar_out);
	280
42dbdcc6	281	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
a074ae38 PU	282
	283	return map;
	284	}
	285
5f9367a8 PU	286	#define TI_XBAR_EDMA_OFFSET 0
	287	#define TI_XBAR_SDMA_OFFSET 1
	288	static const u32 ti_dma_offset[] = {
	289	[TI_XBAR_EDMA_OFFSET] = 0,
	290	[TI_XBAR_SDMA_OFFSET] = 1,
	291	};
	292
42dbdcc6	293	static const struct of_device_id ti_dra7_master_match[] = {
1eb995bb PU	294	{
1eb995bb PU	295	.compatible = "ti,omap4430-sdma",
5f9367a8	296	.data = &ti_dma_offset[TI_XBAR_SDMA_OFFSET],
1eb995bb PU	297	},
	298	{
	299	.compatible = "ti,edma3",
5f9367a8	300	.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
1eb995bb	301	},
2adb2743 PU	302	{
2adb2743 PU	303	.compatible = "ti,edma3-tpcc",
5f9367a8	304	.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
2adb2743	305	},
1eb995bb PU	306	{},
	307	};
	308
0f73f3e8 PU	309	static inline void ti_dra7_xbar_reserve(int offset, int len, unsigned long *p)
	310	{
	311	for (; len > 0; len--)
a2f6721b	312	set_bit(offset + (len - 1), p);
0f73f3e8 PU	313	}
0f73f3e8 PU	314
42dbdcc6	315	static int ti_dra7_xbar_probe(struct platform_device *pdev)
a074ae38 PU	316	{
a074ae38 PU	317	struct device_node *node = pdev->dev.of_node;
1eb995bb	318	const struct of_device_id *match;
a074ae38	319	struct device_node *dma_node;
42dbdcc6	320	struct ti_dra7_xbar_data *xbar;
0f73f3e8	321	struct property *prop;
a074ae38 PU	322	struct resource *res;
a074ae38 PU	323	u32 safe_val;
e7282b66	324	int sz;
a074ae38 PU	325	void __iomem *iomem;
	326	int i, ret;
	327
	328	if (!node)
	329	return -ENODEV;
	330
	331	xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
	332	if (!xbar)
	333	return -ENOMEM;
	334
	335	dma_node = of_parse_phandle(node, "dma-masters", 0);
	336	if (!dma_node) {
	337	dev_err(&pdev->dev, "Can't get DMA master node\n");
	338	return -ENODEV;
	339	}
	340
42dbdcc6	341	match = of_match_node(ti_dra7_master_match, dma_node);
1eb995bb PU	342	if (!match) {
1eb995bb PU	343	dev_err(&pdev->dev, "DMA master is not supported\n");
75bdc7f3	344	of_node_put(dma_node);
1eb995bb PU	345	return -EINVAL;
	346	}
	347
a074ae38 PU	348	if (of_property_read_u32(dma_node, "dma-requests",
	349	&xbar->dma_requests)) {
	350	dev_info(&pdev->dev,
	351	"Missing XBAR output information, using %u.\n",
42dbdcc6 PU	352	TI_DRA7_XBAR_OUTPUTS);
42dbdcc6 PU	353	xbar->dma_requests = TI_DRA7_XBAR_OUTPUTS;
a074ae38 PU	354	}
	355	of_node_put(dma_node);
	356
ec9bfa1e PU	357	xbar->dma_inuse = devm_kcalloc(&pdev->dev,
	358	BITS_TO_LONGS(xbar->dma_requests),
	359	sizeof(unsigned long), GFP_KERNEL);
	360	if (!xbar->dma_inuse)
	361	return -ENOMEM;
	362
a074ae38 PU	363	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
	364	dev_info(&pdev->dev,
	365	"Missing XBAR input information, using %u.\n",
42dbdcc6 PU	366	TI_DRA7_XBAR_INPUTS);
42dbdcc6 PU	367	xbar->xbar_requests = TI_DRA7_XBAR_INPUTS;
a074ae38 PU	368	}
	369
	370	if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
	371	xbar->safe_val = (u16)safe_val;
	372
0f73f3e8 PU	373
	374	prop = of_find_property(node, "ti,reserved-dma-request-ranges", &sz);
	375	if (prop) {
	376	const char pname[] = "ti,reserved-dma-request-ranges";
	377	u32 (*rsv_events)[2];
	378	size_t nelm = sz / sizeof(*rsv_events);
	379	int i;
	380
	381	if (!nelm)
	382	return -EINVAL;
	383
	384	rsv_events = kcalloc(nelm, sizeof(*rsv_events), GFP_KERNEL);
	385	if (!rsv_events)
	386	return -ENOMEM;
	387
	388	ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events,
	389	nelm * 2);
	390	if (ret)
	391	return ret;
	392
	393	for (i = 0; i < nelm; i++) {
	394	ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1],
	395	xbar->dma_inuse);
	396	}
	397	kfree(rsv_events);
	398	}
	399
a074ae38	400	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a074ae38	401	iomem = devm_ioremap_resource(&pdev->dev, res);
28eb232f AL	402	if (IS_ERR(iomem))
28eb232f AL	403	return PTR_ERR(iomem);
a074ae38 PU	404
	405	xbar->iomem = iomem;
	406
	407	xbar->dmarouter.dev = &pdev->dev;
42dbdcc6	408	xbar->dmarouter.route_free = ti_dra7_xbar_free;
5f9367a8	409	xbar->dma_offset = (u32 )match->data;
a074ae38	410
ec9bfa1e	411	mutex_init(&xbar->mutex);
a074ae38 PU	412	platform_set_drvdata(pdev, xbar);
	413
	414	/* Reset the crossbar */
0f73f3e8 PU	415	for (i = 0; i < xbar->dma_requests; i++) {
	416	if (!test_bit(i, xbar->dma_inuse))
	417	ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val);
	418	}
a074ae38	419
42dbdcc6	420	ret = of_dma_router_register(node, ti_dra7_xbar_route_allocate,
a074ae38 PU	421	&xbar->dmarouter);
	422	if (ret) {
	423	/* Restore the defaults for the crossbar */
0f73f3e8 PU	424	for (i = 0; i < xbar->dma_requests; i++) {
	425	if (!test_bit(i, xbar->dma_inuse))
	426	ti_dra7_xbar_write(xbar->iomem, i, i);
	427	}
a074ae38 PU	428	}
	429
	430	return ret;
	431	}
	432
42dbdcc6 PU	433	static int ti_dma_xbar_probe(struct platform_device *pdev)
	434	{
	435	const struct of_device_id *match;
	436	int ret;
	437
	438	match = of_match_node(ti_dma_xbar_match, pdev->dev.of_node);
	439	if (unlikely(!match))
	440	return -EINVAL;
	441
5f9367a8	442	switch ((u32 )match->data) {
42dbdcc6 PU	443	case TI_XBAR_DRA7:
	444	ret = ti_dra7_xbar_probe(pdev);
	445	break;
	446	case TI_XBAR_AM335X:
	447	ret = ti_am335x_xbar_probe(pdev);
	448	break;
	449	default:
	450	dev_err(&pdev->dev, "Unsupported crossbar\n");
	451	ret = -ENODEV;
	452	break;
	453	}
	454
	455	return ret;
	456	}
a074ae38 PU	457
	458	static struct platform_driver ti_dma_xbar_driver = {
	459	.driver = {
	460	.name = "ti-dma-crossbar",
	461	.of_match_table = of_match_ptr(ti_dma_xbar_match),
	462	},
	463	.probe = ti_dma_xbar_probe,
	464	};
	465
d646162b	466	static int omap_dmaxbar_init(void)
a074ae38 PU	467	{
	468	return platform_driver_register(&ti_dma_xbar_driver);
	469	}
	470	arch_initcall(omap_dmaxbar_init);