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
|
/*
* Xilinx SPI OF device driver
*
* Copyright (c) 2009 Intel Corporation
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Supports:
* Xilinx SPI devices as OF devices
*
* Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/of_spi.h>
#include <linux/spi/xilinx_spi.h>
#include "xilinx_spi.h"
static int __devinit xilinx_spi_of_probe(struct of_device *ofdev,
const struct of_device_id *match)
{
struct spi_master *master;
struct xspi_platform_data *pdata;
struct resource r_mem;
struct resource r_irq;
int rc = 0;
const u32 *prop;
int len;
rc = of_address_to_resource(ofdev->node, 0, &r_mem);
if (rc) {
dev_warn(&ofdev->dev, "invalid address\n");
return rc;
}
rc = of_irq_to_resource(ofdev->node, 0, &r_irq);
if (rc == NO_IRQ) {
dev_warn(&ofdev->dev, "no IRQ found\n");
return -ENODEV;
}
ofdev->dev.platform_data =
kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
pdata = ofdev->dev.platform_data;
if (!pdata)
return -ENOMEM;
/* number of slave select bits is required */
prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
if (!prop || len < sizeof(*prop)) {
dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
return -EINVAL;
}
pdata->num_chipselect = *prop;
pdata->bits_per_word = 8;
master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
if (!master)
return -ENODEV;
dev_set_drvdata(&ofdev->dev, master);
/* Add any subnodes on the SPI bus */
of_register_spi_devices(master, ofdev->node);
return 0;
}
static int __devexit xilinx_spi_remove(struct of_device *ofdev)
{
xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
dev_set_drvdata(&ofdev->dev, 0);
kfree(ofdev->dev.platform_data);
ofdev->dev.platform_data = NULL;
return 0;
}
static int __exit xilinx_spi_of_remove(struct of_device *op)
{
return xilinx_spi_remove(op);
}
static const struct of_device_id xilinx_spi_of_match[] = {
{ .compatible = "xlnx,xps-spi-2.00.a", },
{ .compatible = "xlnx,xps-spi-2.00.b", },
{}
};
MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
static struct of_platform_driver xilinx_spi_of_driver = {
.probe = xilinx_spi_of_probe,
.remove = __exit_p(xilinx_spi_of_remove),
.driver = {
.name = "xilinx-xps-spi",
.owner = THIS_MODULE,
.of_match_table = xilinx_spi_of_match,
},
};
static int __init xilinx_spi_of_init(void)
{
return of_register_platform_driver(&xilinx_spi_of_driver);
}
module_init(xilinx_spi_of_init);
static void __exit xilinx_spi_of_exit(void)
{
of_unregister_platform_driver(&xilinx_spi_of_driver);
}
module_exit(xilinx_spi_of_exit);
MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
MODULE_DESCRIPTION("Xilinx SPI platform driver");
MODULE_LICENSE("GPL v2");
|
