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Richard Röjforsd5af91a2009-11-13 12:28:39 +01001/*
2 * Xilinx SPI OF device driver
3 *
4 * Copyright (c) 2009 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20/* Supports:
21 * Xilinx SPI devices as OF devices
22 *
23 * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
24 */
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/interrupt.h>
29#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Richard Röjforsd5af91a2009-11-13 12:28:39 +010031
Grant Likely22ae7822010-07-29 11:49:01 -060032#include <linux/of_address.h>
Richard Röjforsd5af91a2009-11-13 12:28:39 +010033#include <linux/of_platform.h>
34#include <linux/of_device.h>
35#include <linux/of_spi.h>
36
37#include <linux/spi/xilinx_spi.h>
38#include "xilinx_spi.h"
39
40
41static int __devinit xilinx_spi_of_probe(struct of_device *ofdev,
42 const struct of_device_id *match)
43{
44 struct spi_master *master;
45 struct xspi_platform_data *pdata;
46 struct resource r_mem;
47 struct resource r_irq;
48 int rc = 0;
49 const u32 *prop;
50 int len;
51
Grant Likelybf6a67e2010-05-25 00:48:24 -060052 rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
Richard Röjforsd5af91a2009-11-13 12:28:39 +010053 if (rc) {
54 dev_warn(&ofdev->dev, "invalid address\n");
55 return rc;
56 }
57
Grant Likelybf6a67e2010-05-25 00:48:24 -060058 rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
Richard Röjforsd5af91a2009-11-13 12:28:39 +010059 if (rc == NO_IRQ) {
60 dev_warn(&ofdev->dev, "no IRQ found\n");
61 return -ENODEV;
62 }
63
64 ofdev->dev.platform_data =
65 kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL);
66 pdata = ofdev->dev.platform_data;
67 if (!pdata)
68 return -ENOMEM;
69
70 /* number of slave select bits is required */
Grant Likelybf6a67e2010-05-25 00:48:24 -060071 prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
Richard Röjforsd5af91a2009-11-13 12:28:39 +010072 if (!prop || len < sizeof(*prop)) {
73 dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
74 return -EINVAL;
75 }
76 pdata->num_chipselect = *prop;
Richard Röjforsc9da2e12009-11-13 12:28:55 +010077 pdata->bits_per_word = 8;
Richard Röjforsd5af91a2009-11-13 12:28:39 +010078 master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1);
79 if (!master)
80 return -ENODEV;
81
82 dev_set_drvdata(&ofdev->dev, master);
83
Richard Röjforsd5af91a2009-11-13 12:28:39 +010084 return 0;
85}
86
87static int __devexit xilinx_spi_remove(struct of_device *ofdev)
88{
89 xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
90 dev_set_drvdata(&ofdev->dev, 0);
91 kfree(ofdev->dev.platform_data);
92 ofdev->dev.platform_data = NULL;
93 return 0;
94}
95
96static int __exit xilinx_spi_of_remove(struct of_device *op)
97{
98 return xilinx_spi_remove(op);
99}
100
Márton Németh631e61b2010-01-20 13:49:44 -0700101static const struct of_device_id xilinx_spi_of_match[] = {
Richard Röjforsd5af91a2009-11-13 12:28:39 +0100102 { .compatible = "xlnx,xps-spi-2.00.a", },
103 { .compatible = "xlnx,xps-spi-2.00.b", },
104 {}
105};
106
107MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
108
109static struct of_platform_driver xilinx_spi_of_driver = {
Richard Röjforsd5af91a2009-11-13 12:28:39 +0100110 .probe = xilinx_spi_of_probe,
111 .remove = __exit_p(xilinx_spi_of_remove),
112 .driver = {
113 .name = "xilinx-xps-spi",
114 .owner = THIS_MODULE,
Grant Likely40182942010-04-13 16:13:02 -0700115 .of_match_table = xilinx_spi_of_match,
Richard Röjforsd5af91a2009-11-13 12:28:39 +0100116 },
117};
118
119static int __init xilinx_spi_of_init(void)
120{
121 return of_register_platform_driver(&xilinx_spi_of_driver);
122}
123module_init(xilinx_spi_of_init);
124
125static void __exit xilinx_spi_of_exit(void)
126{
127 of_unregister_platform_driver(&xilinx_spi_of_driver);
128}
129module_exit(xilinx_spi_of_exit);
130
131MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
132MODULE_DESCRIPTION("Xilinx SPI platform driver");
133MODULE_LICENSE("GPL v2");