[mirror_ubuntu-bionic-kernel.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;
	u16 mux_val;
};

static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u16 val)
{
	writeb_relaxed(val & 0x1f, 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 = (u16)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");
		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);
	mutex_unlock(&xbar->mutex);
	if (map->xbar_out == xbar->dma_requests) {
		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);

	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--)
		clear_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");
		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;
	52	u16 mux_val;
	53	};
	54
	55	static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u16 val)
	56	{
	57	writeb_relaxed(val & 0x1f, iomem + event);
	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];
108	map->mux_val = (u16)dma_spec->args[2];
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");
152	return -EINVAL;
153	}
154
155	if (of_property_read_u32(dma_node, "dma-requests",
156	&xbar->dma_requests)) {
157	dev_info(&pdev->dev,
158	"Missing XBAR output information, using %u.\n",
159	TI_AM335X_XBAR_LINES);
160	xbar->dma_requests = TI_AM335X_XBAR_LINES;
161	}
162	of_node_put(dma_node);
163
164	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_events)) {
165	dev_info(&pdev->dev,
166	"Missing XBAR input information, using %u.\n",
167	TI_AM335X_XBAR_LINES);
168	xbar->xbar_events = TI_AM335X_XBAR_LINES;
169	}
170
171	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172	iomem = devm_ioremap_resource(&pdev->dev, res);
173	if (IS_ERR(iomem))
174	return PTR_ERR(iomem);
175
176	xbar->iomem = iomem;
177
178	xbar->dmarouter.dev = &pdev->dev;
179	xbar->dmarouter.route_free = ti_am335x_xbar_free;
180
181	platform_set_drvdata(pdev, xbar);
182
183	/* Reset the crossbar */
184	for (i = 0; i < xbar->dma_requests; i++)
185	ti_am335x_xbar_write(xbar->iomem, i, 0);
186
187	ret = of_dma_router_register(node, ti_am335x_xbar_route_allocate,
188	&xbar->dmarouter);
189
190	return ret;
191	}
192
193	/* Crossbar on DRA7xx family */
194	#define TI_DRA7_XBAR_OUTPUTS 127
195	#define TI_DRA7_XBAR_INPUTS 256
a074ae38	196
42dbdcc6	197	struct ti_dra7_xbar_data {
a074ae38 PU	198	void __iomem *iomem;
	199
	200	struct dma_router dmarouter;
ec9bfa1e PU	201	struct mutex mutex;
ec9bfa1e PU	202	unsigned long *dma_inuse;
a074ae38 PU	203
	204	u16 safe_val; /* Value to rest the crossbar lines */
	205	u32 xbar_requests; /* number of DMA requests connected to XBAR */
	206	u32 dma_requests; /* number of DMA requests forwarded to DMA */
1eb995bb	207	u32 dma_offset;
a074ae38 PU	208	};
a074ae38 PU	209
42dbdcc6	210	struct ti_dra7_xbar_map {
a074ae38 PU	211	u16 xbar_in;
	212	int xbar_out;
	213	};
	214
42dbdcc6	215	static inline void ti_dra7_xbar_write(void __iomem *iomem, int xbar, u16 val)
a074ae38 PU	216	{
	217	writew_relaxed(val, iomem + (xbar * 2));
	218	}
	219
42dbdcc6	220	static void ti_dra7_xbar_free(struct device dev, void route_data)
a074ae38	221	{
42dbdcc6 PU	222	struct ti_dra7_xbar_data *xbar = dev_get_drvdata(dev);
42dbdcc6 PU	223	struct ti_dra7_xbar_map *map = route_data;
a074ae38 PU	224
	225	dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
	226	map->xbar_in, map->xbar_out);
	227
42dbdcc6	228	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
ec9bfa1e PU	229	mutex_lock(&xbar->mutex);
	230	clear_bit(map->xbar_out, xbar->dma_inuse);
	231	mutex_unlock(&xbar->mutex);
a074ae38 PU	232	kfree(map);
	233	}
	234
42dbdcc6 PU	235	static void ti_dra7_xbar_route_allocate(struct of_phandle_args dma_spec,
42dbdcc6 PU	236	struct of_dma *ofdma)
a074ae38 PU	237	{
a074ae38 PU	238	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
42dbdcc6 PU	239	struct ti_dra7_xbar_data *xbar = platform_get_drvdata(pdev);
42dbdcc6 PU	240	struct ti_dra7_xbar_map *map;
a074ae38 PU	241
	242	if (dma_spec->args[0] >= xbar->xbar_requests) {
	243	dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
	244	dma_spec->args[0]);
	245	return ERR_PTR(-EINVAL);
	246	}
	247
	248	/* The of_node_put() will be done in the core for the node */
	249	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
	250	if (!dma_spec->np) {
	251	dev_err(&pdev->dev, "Can't get DMA master\n");
	252	return ERR_PTR(-EINVAL);
	253	}
	254
	255	map = kzalloc(sizeof(*map), GFP_KERNEL);
	256	if (!map) {
	257	of_node_put(dma_spec->np);
	258	return ERR_PTR(-ENOMEM);
	259	}
	260
ec9bfa1e PU	261	mutex_lock(&xbar->mutex);
	262	map->xbar_out = find_first_zero_bit(xbar->dma_inuse,
	263	xbar->dma_requests);
	264	mutex_unlock(&xbar->mutex);
	265	if (map->xbar_out == xbar->dma_requests) {
	266	dev_err(&pdev->dev, "Run out of free DMA requests\n");
	267	kfree(map);
	268	return ERR_PTR(-ENOMEM);
	269	}
	270	set_bit(map->xbar_out, xbar->dma_inuse);
	271
a074ae38 PU	272	map->xbar_in = (u16)dma_spec->args[0];
a074ae38 PU	273
1eb995bb	274	dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
a074ae38 PU	275
	276	dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
	277	map->xbar_in, map->xbar_out);
	278
42dbdcc6	279	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
a074ae38 PU	280
	281	return map;
	282	}
	283
5f9367a8 PU	284	#define TI_XBAR_EDMA_OFFSET 0
	285	#define TI_XBAR_SDMA_OFFSET 1
	286	static const u32 ti_dma_offset[] = {
	287	[TI_XBAR_EDMA_OFFSET] = 0,
	288	[TI_XBAR_SDMA_OFFSET] = 1,
	289	};
	290
42dbdcc6	291	static const struct of_device_id ti_dra7_master_match[] = {
1eb995bb PU	292	{
1eb995bb PU	293	.compatible = "ti,omap4430-sdma",
5f9367a8	294	.data = &ti_dma_offset[TI_XBAR_SDMA_OFFSET],
1eb995bb PU	295	},
	296	{
	297	.compatible = "ti,edma3",
5f9367a8	298	.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
1eb995bb	299	},
2adb2743 PU	300	{
2adb2743 PU	301	.compatible = "ti,edma3-tpcc",
5f9367a8	302	.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
2adb2743	303	},
1eb995bb PU	304	{},
	305	};
	306
0f73f3e8 PU	307	static inline void ti_dra7_xbar_reserve(int offset, int len, unsigned long *p)
	308	{
	309	for (; len > 0; len--)
	310	clear_bit(offset + (len - 1), p);
	311	}
	312
42dbdcc6	313	static int ti_dra7_xbar_probe(struct platform_device *pdev)
a074ae38 PU	314	{
a074ae38 PU	315	struct device_node *node = pdev->dev.of_node;
1eb995bb	316	const struct of_device_id *match;
a074ae38	317	struct device_node *dma_node;
42dbdcc6	318	struct ti_dra7_xbar_data *xbar;
0f73f3e8	319	struct property *prop;
a074ae38 PU	320	struct resource *res;
a074ae38 PU	321	u32 safe_val;
e7282b66	322	int sz;
a074ae38 PU	323	void __iomem *iomem;
	324	int i, ret;
	325
	326	if (!node)
	327	return -ENODEV;
	328
	329	xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
	330	if (!xbar)
	331	return -ENOMEM;
	332
	333	dma_node = of_parse_phandle(node, "dma-masters", 0);
	334	if (!dma_node) {
	335	dev_err(&pdev->dev, "Can't get DMA master node\n");
	336	return -ENODEV;
	337	}
	338
42dbdcc6	339	match = of_match_node(ti_dra7_master_match, dma_node);
1eb995bb PU	340	if (!match) {
	341	dev_err(&pdev->dev, "DMA master is not supported\n");
	342	return -EINVAL;
	343	}
	344
a074ae38 PU	345	if (of_property_read_u32(dma_node, "dma-requests",
	346	&xbar->dma_requests)) {
	347	dev_info(&pdev->dev,
	348	"Missing XBAR output information, using %u.\n",
42dbdcc6 PU	349	TI_DRA7_XBAR_OUTPUTS);
42dbdcc6 PU	350	xbar->dma_requests = TI_DRA7_XBAR_OUTPUTS;
a074ae38 PU	351	}
	352	of_node_put(dma_node);
	353
ec9bfa1e PU	354	xbar->dma_inuse = devm_kcalloc(&pdev->dev,
	355	BITS_TO_LONGS(xbar->dma_requests),
	356	sizeof(unsigned long), GFP_KERNEL);
	357	if (!xbar->dma_inuse)
	358	return -ENOMEM;
	359
a074ae38 PU	360	if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
	361	dev_info(&pdev->dev,
	362	"Missing XBAR input information, using %u.\n",
42dbdcc6 PU	363	TI_DRA7_XBAR_INPUTS);
42dbdcc6 PU	364	xbar->xbar_requests = TI_DRA7_XBAR_INPUTS;
a074ae38 PU	365	}
	366
	367	if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
	368	xbar->safe_val = (u16)safe_val;
	369
0f73f3e8 PU	370
	371	prop = of_find_property(node, "ti,reserved-dma-request-ranges", &sz);
	372	if (prop) {
	373	const char pname[] = "ti,reserved-dma-request-ranges";
	374	u32 (*rsv_events)[2];
	375	size_t nelm = sz / sizeof(*rsv_events);
	376	int i;
	377
	378	if (!nelm)
	379	return -EINVAL;
	380
	381	rsv_events = kcalloc(nelm, sizeof(*rsv_events), GFP_KERNEL);
	382	if (!rsv_events)
	383	return -ENOMEM;
	384
	385	ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events,
	386	nelm * 2);
	387	if (ret)
	388	return ret;
	389
	390	for (i = 0; i < nelm; i++) {
	391	ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1],
	392	xbar->dma_inuse);
	393	}
	394	kfree(rsv_events);
	395	}
	396
a074ae38	397	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a074ae38	398	iomem = devm_ioremap_resource(&pdev->dev, res);
28eb232f AL	399	if (IS_ERR(iomem))
28eb232f AL	400	return PTR_ERR(iomem);
a074ae38 PU	401
	402	xbar->iomem = iomem;
	403
	404	xbar->dmarouter.dev = &pdev->dev;
42dbdcc6	405	xbar->dmarouter.route_free = ti_dra7_xbar_free;
5f9367a8	406	xbar->dma_offset = (u32 )match->data;
a074ae38	407
ec9bfa1e	408	mutex_init(&xbar->mutex);
a074ae38 PU	409	platform_set_drvdata(pdev, xbar);
	410
	411	/* Reset the crossbar */
0f73f3e8 PU	412	for (i = 0; i < xbar->dma_requests; i++) {
	413	if (!test_bit(i, xbar->dma_inuse))
	414	ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val);
	415	}
a074ae38	416
42dbdcc6	417	ret = of_dma_router_register(node, ti_dra7_xbar_route_allocate,
a074ae38 PU	418	&xbar->dmarouter);
	419	if (ret) {
	420	/* Restore the defaults for the crossbar */
0f73f3e8 PU	421	for (i = 0; i < xbar->dma_requests; i++) {
	422	if (!test_bit(i, xbar->dma_inuse))
	423	ti_dra7_xbar_write(xbar->iomem, i, i);
	424	}
a074ae38 PU	425	}
	426
	427	return ret;
	428	}
	429
42dbdcc6 PU	430	static int ti_dma_xbar_probe(struct platform_device *pdev)
	431	{
	432	const struct of_device_id *match;
	433	int ret;
	434
	435	match = of_match_node(ti_dma_xbar_match, pdev->dev.of_node);
	436	if (unlikely(!match))
	437	return -EINVAL;
	438
5f9367a8	439	switch ((u32 )match->data) {
42dbdcc6 PU	440	case TI_XBAR_DRA7:
	441	ret = ti_dra7_xbar_probe(pdev);
	442	break;
	443	case TI_XBAR_AM335X:
	444	ret = ti_am335x_xbar_probe(pdev);
	445	break;
	446	default:
	447	dev_err(&pdev->dev, "Unsupported crossbar\n");
	448	ret = -ENODEV;
	449	break;
	450	}
	451
	452	return ret;
	453	}
a074ae38 PU	454
	455	static struct platform_driver ti_dma_xbar_driver = {
	456	.driver = {
	457	.name = "ti-dma-crossbar",
	458	.of_match_table = of_match_ptr(ti_dma_xbar_match),
	459	},
	460	.probe = ti_dma_xbar_probe,
	461	};
	462
d646162b	463	static int omap_dmaxbar_init(void)
a074ae38 PU	464	{
	465	return platform_driver_register(&ti_dma_xbar_driver);
	466	}
	467	arch_initcall(omap_dmaxbar_init);