1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/misc/xillybus_of.c
4 *
5 * Copyright 2011 Xillybus Ltd, http://xillybus.com
6 *
7 * Driver for the Xillybus FPGA/host framework using Open Firmware.
8 */
9
10 #include <linux/module.h>
11 #include <linux/device.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/of.h>
15 #include <linux/err.h>
16 #include "xillybus.h"
17
18 MODULE_DESCRIPTION("Xillybus driver for Open Firmware");
19 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
20 MODULE_VERSION("1.06");
21 MODULE_ALIAS("xillybus_of");
22 MODULE_LICENSE("GPL v2");
23
24 static const char xillyname[] = "xillybus_of";
25
26 /* Match table for of_platform binding */
27 static const struct of_device_id xillybus_of_match[] = {
28 { .compatible = "xillybus,xillybus-1.00.a", },
29 { .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
30 {}
31 };
32
33 MODULE_DEVICE_TABLE(of, xillybus_of_match);
34
xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)35 static void xilly_dma_sync_single_for_cpu_of(struct xilly_endpoint *ep,
36 dma_addr_t dma_handle,
37 size_t size,
38 int direction)
39 {
40 dma_sync_single_for_cpu(ep->dev, dma_handle, size, direction);
41 }
42
xilly_dma_sync_single_for_device_of(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)43 static void xilly_dma_sync_single_for_device_of(struct xilly_endpoint *ep,
44 dma_addr_t dma_handle,
45 size_t size,
46 int direction)
47 {
48 dma_sync_single_for_device(ep->dev, dma_handle, size, direction);
49 }
50
xilly_dma_sync_single_nop(struct xilly_endpoint * ep,dma_addr_t dma_handle,size_t size,int direction)51 static void xilly_dma_sync_single_nop(struct xilly_endpoint *ep,
52 dma_addr_t dma_handle,
53 size_t size,
54 int direction)
55 {
56 }
57
xilly_of_unmap(void * ptr)58 static void xilly_of_unmap(void *ptr)
59 {
60 struct xilly_mapping *data = ptr;
61
62 dma_unmap_single(data->device, data->dma_addr,
63 data->size, data->direction);
64
65 kfree(ptr);
66 }
67
xilly_map_single_of(struct xilly_endpoint * ep,void * ptr,size_t size,int direction,dma_addr_t * ret_dma_handle)68 static int xilly_map_single_of(struct xilly_endpoint *ep,
69 void *ptr,
70 size_t size,
71 int direction,
72 dma_addr_t *ret_dma_handle
73 )
74 {
75 dma_addr_t addr;
76 struct xilly_mapping *this;
77
78 this = kzalloc(sizeof(*this), GFP_KERNEL);
79 if (!this)
80 return -ENOMEM;
81
82 addr = dma_map_single(ep->dev, ptr, size, direction);
83
84 if (dma_mapping_error(ep->dev, addr)) {
85 kfree(this);
86 return -ENODEV;
87 }
88
89 this->device = ep->dev;
90 this->dma_addr = addr;
91 this->size = size;
92 this->direction = direction;
93
94 *ret_dma_handle = addr;
95
96 return devm_add_action_or_reset(ep->dev, xilly_of_unmap, this);
97 }
98
99 static struct xilly_endpoint_hardware of_hw = {
100 .owner = THIS_MODULE,
101 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_of,
102 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_of,
103 .map_single = xilly_map_single_of,
104 };
105
106 static struct xilly_endpoint_hardware of_hw_coherent = {
107 .owner = THIS_MODULE,
108 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_nop,
109 .hw_sync_sgl_for_device = xilly_dma_sync_single_nop,
110 .map_single = xilly_map_single_of,
111 };
112
xilly_drv_probe(struct platform_device * op)113 static int xilly_drv_probe(struct platform_device *op)
114 {
115 struct device *dev = &op->dev;
116 struct xilly_endpoint *endpoint;
117 int rc;
118 int irq;
119 struct resource *res;
120 struct xilly_endpoint_hardware *ephw = &of_hw;
121
122 if (of_property_read_bool(dev->of_node, "dma-coherent"))
123 ephw = &of_hw_coherent;
124
125 endpoint = xillybus_init_endpoint(NULL, dev, ephw);
126
127 if (!endpoint)
128 return -ENOMEM;
129
130 dev_set_drvdata(dev, endpoint);
131
132 res = platform_get_resource(op, IORESOURCE_MEM, 0);
133 endpoint->registers = devm_ioremap_resource(dev, res);
134
135 if (IS_ERR(endpoint->registers))
136 return PTR_ERR(endpoint->registers);
137
138 irq = platform_get_irq(op, 0);
139
140 rc = devm_request_irq(dev, irq, xillybus_isr, 0, xillyname, endpoint);
141
142 if (rc) {
143 dev_err(endpoint->dev,
144 "Failed to register IRQ handler. Aborting.\n");
145 return -ENODEV;
146 }
147
148 return xillybus_endpoint_discovery(endpoint);
149 }
150
xilly_drv_remove(struct platform_device * op)151 static int xilly_drv_remove(struct platform_device *op)
152 {
153 struct device *dev = &op->dev;
154 struct xilly_endpoint *endpoint = dev_get_drvdata(dev);
155
156 xillybus_endpoint_remove(endpoint);
157
158 return 0;
159 }
160
161 static struct platform_driver xillybus_platform_driver = {
162 .probe = xilly_drv_probe,
163 .remove = xilly_drv_remove,
164 .driver = {
165 .name = xillyname,
166 .of_match_table = xillybus_of_match,
167 },
168 };
169
170 module_platform_driver(xillybus_platform_driver);
171
