2 * Xilinx SPI OF device driver
4 * Copyright (c) 2009 Intel Corporation
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.
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.
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.
21 * Xilinx SPI devices as OF devices
23 * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
30 #include <linux/slab.h>
32 #include <linux/of_address.h>
33 #include <linux/of_platform.h>
34 #include <linux/of_device.h>
35 #include <linux/of_spi.h>
37 #include <linux/spi/xilinx_spi.h>
38 #include "xilinx_spi.h"
41 static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev,
42 const struct of_device_id *match)
44 struct spi_master *master;
45 struct resource r_mem;
46 struct resource r_irq;
51 rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
53 dev_warn(&ofdev->dev, "invalid address\n");
57 rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
59 dev_warn(&ofdev->dev, "no IRQ found\n");
63 /* number of slave select bits is required */
64 prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
65 if (!prop || len < sizeof(*prop)) {
66 dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
69 num_cs = __be32_to_cpup(prop);
70 master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1,
75 dev_set_drvdata(&ofdev->dev, master);
80 static int __devexit xilinx_spi_remove(struct platform_device *ofdev)
82 xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
83 dev_set_drvdata(&ofdev->dev, 0);
87 static int __exit xilinx_spi_of_remove(struct platform_device *op)
89 return xilinx_spi_remove(op);
92 static const struct of_device_id xilinx_spi_of_match[] = {
93 { .compatible = "xlnx,xps-spi-2.00.a", },
94 { .compatible = "xlnx,xps-spi-2.00.b", },
98 MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
100 static struct of_platform_driver xilinx_spi_of_driver = {
101 .probe = xilinx_spi_of_probe,
102 .remove = __exit_p(xilinx_spi_of_remove),
104 .name = "xilinx-xps-spi",
105 .owner = THIS_MODULE,
106 .of_match_table = xilinx_spi_of_match,
110 static int __init xilinx_spi_of_init(void)
112 return of_register_platform_driver(&xilinx_spi_of_driver);
114 module_init(xilinx_spi_of_init);
116 static void __exit xilinx_spi_of_exit(void)
118 of_unregister_platform_driver(&xilinx_spi_of_driver);
120 module_exit(xilinx_spi_of_exit);
122 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
123 MODULE_DESCRIPTION("Xilinx SPI platform driver");
124 MODULE_LICENSE("GPL v2");