Commit | Line | Data |
---|---|---|
d5af91a1 RR |
1 | /* |
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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
d5af91a1 RR |
31 | |
32 | #include <linux/of_platform.h> | |
33 | #include <linux/of_device.h> | |
34 | #include <linux/of_spi.h> | |
35 | ||
36 | #include <linux/spi/xilinx_spi.h> | |
37 | #include "xilinx_spi.h" | |
38 | ||
39 | ||
40 | static int __devinit xilinx_spi_of_probe(struct of_device *ofdev, | |
41 | const struct of_device_id *match) | |
42 | { | |
43 | struct spi_master *master; | |
44 | struct xspi_platform_data *pdata; | |
45 | struct resource r_mem; | |
46 | struct resource r_irq; | |
47 | int rc = 0; | |
48 | const u32 *prop; | |
49 | int len; | |
50 | ||
51 | rc = of_address_to_resource(ofdev->node, 0, &r_mem); | |
52 | if (rc) { | |
53 | dev_warn(&ofdev->dev, "invalid address\n"); | |
54 | return rc; | |
55 | } | |
56 | ||
57 | rc = of_irq_to_resource(ofdev->node, 0, &r_irq); | |
58 | if (rc == NO_IRQ) { | |
59 | dev_warn(&ofdev->dev, "no IRQ found\n"); | |
60 | return -ENODEV; | |
61 | } | |
62 | ||
63 | ofdev->dev.platform_data = | |
64 | kzalloc(sizeof(struct xspi_platform_data), GFP_KERNEL); | |
65 | pdata = ofdev->dev.platform_data; | |
66 | if (!pdata) | |
67 | return -ENOMEM; | |
68 | ||
69 | /* number of slave select bits is required */ | |
70 | prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len); | |
71 | if (!prop || len < sizeof(*prop)) { | |
72 | dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n"); | |
73 | return -EINVAL; | |
74 | } | |
75 | pdata->num_chipselect = *prop; | |
c9da2e12 | 76 | pdata->bits_per_word = 8; |
d5af91a1 RR |
77 | master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1); |
78 | if (!master) | |
79 | return -ENODEV; | |
80 | ||
81 | dev_set_drvdata(&ofdev->dev, master); | |
82 | ||
83 | /* Add any subnodes on the SPI bus */ | |
84 | of_register_spi_devices(master, ofdev->node); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int __devexit xilinx_spi_remove(struct of_device *ofdev) | |
90 | { | |
91 | xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev)); | |
92 | dev_set_drvdata(&ofdev->dev, 0); | |
93 | kfree(ofdev->dev.platform_data); | |
94 | ofdev->dev.platform_data = NULL; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int __exit xilinx_spi_of_remove(struct of_device *op) | |
99 | { | |
100 | return xilinx_spi_remove(op); | |
101 | } | |
102 | ||
631e61b7 | 103 | static const struct of_device_id xilinx_spi_of_match[] = { |
d5af91a1 RR |
104 | { .compatible = "xlnx,xps-spi-2.00.a", }, |
105 | { .compatible = "xlnx,xps-spi-2.00.b", }, | |
106 | {} | |
107 | }; | |
108 | ||
109 | MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); | |
110 | ||
111 | static struct of_platform_driver xilinx_spi_of_driver = { | |
112 | .match_table = xilinx_spi_of_match, | |
113 | .probe = xilinx_spi_of_probe, | |
114 | .remove = __exit_p(xilinx_spi_of_remove), | |
115 | .driver = { | |
116 | .name = "xilinx-xps-spi", | |
117 | .owner = THIS_MODULE, | |
118 | }, | |
119 | }; | |
120 | ||
121 | static int __init xilinx_spi_of_init(void) | |
122 | { | |
123 | return of_register_platform_driver(&xilinx_spi_of_driver); | |
124 | } | |
125 | module_init(xilinx_spi_of_init); | |
126 | ||
127 | static void __exit xilinx_spi_of_exit(void) | |
128 | { | |
129 | of_unregister_platform_driver(&xilinx_spi_of_driver); | |
130 | } | |
131 | module_exit(xilinx_spi_of_exit); | |
132 | ||
133 | MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); | |
134 | MODULE_DESCRIPTION("Xilinx SPI platform driver"); | |
135 | MODULE_LICENSE("GPL v2"); |