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
25 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
26 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
27 MODULE_VERSION("1.06");
28 MODULE_ALIAS("xillybus_of");
29 MODULE_LICENSE("GPL v2");
30
31 static const char xillyname[] = "xillybus_of";
32
33 /* Match table for of_platform binding */
34 static 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
40 MODULE_DEVICE_TABLE(of, xillybus_of_match);
41
xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)42 static 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
xilly_dma_sync_single_for_device_of(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)50 static 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
xilly_dma_sync_single_nop(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)58 static 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
xilly_of_unmap(void * ptr)65 static 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
xilly_map_single_of(struct xilly_endpoint * ep,void * ptr,size_t size,int direction,dma_addr_t * ret_dma_handle)75 static 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
85 this = kzalloc(sizeof(*this), GFP_KERNEL);
86 if (!this)
87 return -ENOMEM;
88
89 addr = dma_map_single(ep->dev, ptr, size, direction);
90
91 if (dma_mapping_error(ep->dev, addr)) {
92 kfree(this);
93 return -ENODEV;
94 }
95
96 this->device = ep->dev;
97 this->dma_addr = addr;
98 this->size = size;
99 this->direction = direction;
100
101 *ret_dma_handle = addr;
102
103 return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this);
104 }
105
106 static struct xilly_endpoint_hardware of_hw = {
107 .owner = THIS_MODULE,
108 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
109 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
110 .map_single = xilly_map_single_of,
111 };
112
113 static struct xilly_endpoint_hardware of_hw_coherent = {
114 .owner = THIS_MODULE,
115 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
116 .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
117 .map_single = xilly_map_single_of,
118 };
119
xilly_drv_probe(struct platform_device * op)120 static int xilly_drv_probe(struct platform_device *op)
121 {
122 struct device *dev = &op->dev;
123 struct xilly_endpoint *endpoint;
124 int rc;
125 int irq;
126 struct resource res;
127 struct xilly_endpoint_hardware *ephw = &of_hw;
128
129 if (of_property_read_bool(dev->of_node, "dma-coherent"))
130 ephw = &of_hw_coherent;
131
132 endpoint = xillybus_init_endpoint(NULL, dev, ephw);
133
134 if (!endpoint)
135 return -ENOMEM;
136
137 dev_set_drvdata(dev, endpoint);
138
139 rc = of_address_to_resource(dev->of_node, 0, &res);
140 endpoint->registers = devm_ioremap_resource(dev, &res);
141
142 if (IS_ERR(endpoint->registers))
143 return PTR_ERR(endpoint->registers);
144
145 irq = irq_of_parse_and_map(dev->of_node, 0);
146
147 rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
148
149 if (rc) {
150 dev_err(endpoint->dev,
151 "Failed to register IRQ handler. Aborting.\n");
152 return -ENODEV;
153 }
154
155 return xillybus_endpoint_discovery(endpoint);
156 }
157
xilly_drv_remove(struct platform_device * op)158 static int xilly_drv_remove(struct platform_device *op)
159 {
160 struct device *dev = &op->dev;
161 struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
162
163 xillybus_endpoint_remove(endpoint);
164
165 return 0;
166 }
167
168 static struct platform_driver xillybus_platform_driver = {
169 .probe = xilly_drv_probe,
170 .remove = xilly_drv_remove,
171 .driver = {
172 .name = xillyname,
173 .of_match_table = xillybus_of_match,
174 },
175 };
176
177 module_platform_driver(xillybus_platform_driver);
178