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