1/*
2 * linux/drivers/misc/xillybus_of.c
3 *
4 * Copyright 2011 Xillybus Ltd, http://xillybus.com
5 *
6 * Driver for the Xillybus FPGA/host framework using Open Firmware.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the smems of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 */
12
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/slab.h>
16#include <linux/platform_device.h>
17#include <linux/of.h>
18#include <linux/of_irq.h>
19#include <linux/of_address.h>
20#include <linux/of_device.h>
21#include <linux/of_platform.h>
22#include <linux/err.h>
23#include "xillybus.h"
24
25MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
26MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
27MODULE_VERSION("1.06");
28MODULE_ALIAS("xillybus_of");
29MODULE_LICENSE("GPL v2");
30
31static const char xillyname[] = "xillybus_of";
32
33/* Match table for of_platform binding */
34static const struct of_device_id xillybus_of_match[] = {
35	{ .compatible = "xillybus,xillybus-1.00.a", },
36	{ .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
37	{}
38};
39
40MODULE_DEVICE_TABLE(of, xillybus_of_match);
41
42static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
43					     dma_addr_t dma_handle,
44					     size_t size,
45					     int direction)
46{
47	dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
48}
49
50static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
51						dma_addr_t dma_handle,
52						size_t size,
53						int direction)
54{
55	dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
56}
57
58static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
59				      dma_addr_t dma_handle,
60				      size_t size,
61				      int direction)
62{
63}
64
65static void xilly_of_unmap(void *ptr)
66{
67	struct xilly_mapping *data = ptr;
68
69	dma_unmap_single(data->device, data->dma_addr,
70			 data->size, data->direction);
71
72	kfree(ptr);
73}
74
75static int xilly_map_single_of(struct xilly_endpoint *ep,
76			       void *ptr,
77			       size_t size,
78			       int direction,
79			       dma_addr_t *ret_dma_handle
80	)
81{
82	dma_addr_t addr;
83	struct xilly_mapping *this;
84	int rc;
85
86	this = kzalloc(sizeof(*this), GFP_KERNEL);
87	if (!this)
88		return -ENOMEM;
89
90	addr = dma_map_single(ep->dev, ptr, size, direction);
91
92	if (dma_mapping_error(ep->dev, addr)) {
93		kfree(this);
94		return -ENODEV;
95	}
96
97	this->device = ep->dev;
98	this->dma_addr = addr;
99	this->size = size;
100	this->direction = direction;
101
102	*ret_dma_handle = addr;
103
104	rc = devm_add_action(ep->dev, xilly_of_unmap, this);
105
106	if (rc) {
107		dma_unmap_single(ep->dev, addr, size, direction);
108		kfree(this);
109		return rc;
110	}
111
112	return 0;
113}
114
115static struct xilly_endpoint_hardware of_hw = {
116	.owner = THIS_MODULE,
117	.hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
118	.hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
119	.map_single = xilly_map_single_of,
120};
121
122static struct xilly_endpoint_hardware of_hw_coherent = {
123	.owner = THIS_MODULE,
124	.hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
125	.hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
126	.map_single = xilly_map_single_of,
127};
128
129static int xilly_drv_probe(struct platform_device *op)
130{
131	struct device *dev = &op->dev;
132	struct xilly_endpoint *endpoint;
133	int rc;
134	int irq;
135	struct resource res;
136	struct xilly_endpoint_hardware *ephw = &of_hw;
137
138	if (of_property_read_bool(dev->of_node, "dma-coherent"))
139		ephw = &of_hw_coherent;
140
141	endpoint = xillybus_init_endpoint(NULL, dev, ephw);
142
143	if (!endpoint)
144		return -ENOMEM;
145
146	dev_set_drvdata(dev, endpoint);
147
148	rc = of_address_to_resource(dev->of_node, 0, &res);
149	endpoint->registers = devm_ioremap_resource(dev, &res);
150
151	if (IS_ERR(endpoint->registers))
152		return PTR_ERR(endpoint->registers);
153
154	irq = irq_of_parse_and_map(dev->of_node, 0);
155
156	rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
157
158	if (rc) {
159		dev_err(endpoint->dev,
160			"Failed to register IRQ handler. Aborting.\n");
161		return -ENODEV;
162	}
163
164	return xillybus_endpoint_discovery(endpoint);
165}
166
167static int xilly_drv_remove(struct platform_device *op)
168{
169	struct device *dev = &op->dev;
170	struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
171
172	xillybus_endpoint_remove(endpoint);
173
174	return 0;
175}
176
177static struct platform_driver xillybus_platform_driver = {
178	.probe = xilly_drv_probe,
179	.remove = xilly_drv_remove,
180	.driver = {
181		.name = xillyname,
182		.of_match_table = xillybus_of_match,
183	},
184};
185
186module_platform_driver(xillybus_platform_driver);
187