aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/xillybus/xillybus_of.c
blob: 1ca0c7a4f1bea2ee6a67669d2a3cdb3c532a331c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/*
 * linux/drivers/misc/xillybus_of.c
 *
 * Copyright 2011 Xillybus Ltd, http://xillybus.com
 *
 * Driver for the Xillybus FPGA/host framework using Open Firmware.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the smems of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/err.h>
#include "xillybus.h"

MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
MODULE_VERSION("1.06");
MODULE_ALIAS("xillybus_of");
MODULE_LICENSE("GPL v2");

static const char xillyname[] = "xillybus_of";

/* Match table for of_platform binding */
static struct of_device_id xillybus_of_match[] = {
	{ .compatible = "xillybus,xillybus-1.00.a", },
	{ .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
	{}
};

MODULE_DEVICE_TABLE(of, xillybus_of_match);

static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
					     dma_addr_t dma_handle,
					     size_t size,
					     int direction)
{
	dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
}

static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
						dma_addr_t dma_handle,
						size_t size,
						int direction)
{
	dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
}

static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
				      dma_addr_t dma_handle,
				      size_t size,
				      int direction)
{
}

static void xilly_of_unmap(void *ptr)
{
	struct xilly_mapping *data = ptr;

	dma_unmap_single(data->device, data->dma_addr,
			 data->size, data->direction);

	kfree(ptr);
}

static int xilly_map_single_of(struct xilly_endpoint *ep,
			       void *ptr,
			       size_t size,
			       int direction,
			       dma_addr_t *ret_dma_handle
	)
{
	dma_addr_t addr;
	struct xilly_mapping *this;
	int rc;

	this = kzalloc(sizeof(*this), GFP_KERNEL);
	if (!this)
		return -ENOMEM;

	addr = dma_map_single(ep->dev, ptr, size, direction);

	if (dma_mapping_error(ep->dev, addr)) {
		kfree(this);
		return -ENODEV;
	}

	this->device = ep->dev;
	this->dma_addr = addr;
	this->size = size;
	this->direction = direction;

	*ret_dma_handle = addr;

	rc = devm_add_action(ep->dev, xilly_of_unmap, this);

	if (rc) {
		dma_unmap_single(ep->dev, addr, size, direction);
		kfree(this);
		return rc;
	}

	return 0;
}

static struct xilly_endpoint_hardware of_hw = {
	.owner = THIS_MODULE,
	.hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
	.hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
	.map_single = xilly_map_single_of,
};

static struct xilly_endpoint_hardware of_hw_coherent = {
	.owner = THIS_MODULE,
	.hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
	.hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
	.map_single = xilly_map_single_of,
};

static int xilly_drv_probe(struct platform_device *op)
{
	struct device *dev = &op->dev;
	struct xilly_endpoint *endpoint;
	int rc;
	int irq;
	struct resource res;
	struct xilly_endpoint_hardware *ephw = &of_hw;

	if (of_property_read_bool(dev->of_node, "dma-coherent"))
		ephw = &of_hw_coherent;

	endpoint = xillybus_init_endpoint(NULL, dev, ephw);

	if (!endpoint)
		return -ENOMEM;

	dev_set_drvdata(dev, endpoint);

	rc = of_address_to_resource(dev->of_node, 0, &res);
	endpoint->registers = devm_ioremap_resource(dev, &res);

	if (IS_ERR(endpoint->registers))
		return PTR_ERR(endpoint->registers);

	irq = irq_of_parse_and_map(dev->of_node, 0);

	rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);

	if (rc) {
		dev_err(endpoint->dev,
			"Failed to register IRQ handler. Aborting.\n");
		return -ENODEV;
	}

	return xillybus_endpoint_discovery(endpoint);
}

static int xilly_drv_remove(struct platform_device *op)
{
	struct device *dev = &op->dev;
	struct xilly_endpoint *endpoint = dev_get_drvdata(dev);

	xillybus_endpoint_remove(endpoint);

	return 0;
}

static struct platform_driver xillybus_platform_driver = {
	.probe = xilly_drv_probe,
	.remove = xilly_drv_remove,
	.driver = {
		.name = xillyname,
		.owner = THIS_MODULE,
		.of_match_table = xillybus_of_match,
	},
};

module_platform_driver(xillybus_platform_driver);

Privacy Policy