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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 | 31 | |
22ae782f | 32 | #include <linux/of_address.h> |
d5af91a1 RR |
33 | #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 | ||
2dc11581 | 41 | static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev, |
d5af91a1 RR |
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 | ||
bf6a67ee | 52 | rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem); |
d5af91a1 RR |
53 | if (rc) { |
54 | dev_warn(&ofdev->dev, "invalid address\n"); | |
55 | return rc; | |
56 | } | |
57 | ||
bf6a67ee | 58 | rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq); |
d5af91a1 RR |
59 | 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 */ | |
bf6a67ee | 71 | prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len); |
d5af91a1 RR |
72 | 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; | |
c9da2e12 | 77 | pdata->bits_per_word = 8; |
d5af91a1 RR |
78 | 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 | ||
d5af91a1 RR |
84 | return 0; |
85 | } | |
86 | ||
2dc11581 | 87 | static int __devexit xilinx_spi_remove(struct platform_device *ofdev) |
d5af91a1 RR |
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 | ||
2dc11581 | 96 | static int __exit xilinx_spi_of_remove(struct platform_device *op) |
d5af91a1 RR |
97 | { |
98 | return xilinx_spi_remove(op); | |
99 | } | |
100 | ||
631e61b7 | 101 | static const struct of_device_id xilinx_spi_of_match[] = { |
d5af91a1 RR |
102 | { .compatible = "xlnx,xps-spi-2.00.a", }, |
103 | { .compatible = "xlnx,xps-spi-2.00.b", }, | |
104 | {} | |
105 | }; | |
106 | ||
107 | MODULE_DEVICE_TABLE(of, xilinx_spi_of_match); | |
108 | ||
109 | static struct of_platform_driver xilinx_spi_of_driver = { | |
d5af91a1 RR |
110 | .probe = xilinx_spi_of_probe, |
111 | .remove = __exit_p(xilinx_spi_of_remove), | |
112 | .driver = { | |
113 | .name = "xilinx-xps-spi", | |
114 | .owner = THIS_MODULE, | |
4018294b | 115 | .of_match_table = xilinx_spi_of_match, |
d5af91a1 RR |
116 | }, |
117 | }; | |
118 | ||
119 | static int __init xilinx_spi_of_init(void) | |
120 | { | |
121 | return of_register_platform_driver(&xilinx_spi_of_driver); | |
122 | } | |
123 | module_init(xilinx_spi_of_init); | |
124 | ||
125 | static void __exit xilinx_spi_of_exit(void) | |
126 | { | |
127 | of_unregister_platform_driver(&xilinx_spi_of_driver); | |
128 | } | |
129 | module_exit(xilinx_spi_of_exit); | |
130 | ||
131 | MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); | |
132 | MODULE_DESCRIPTION("Xilinx SPI platform driver"); | |
133 | MODULE_LICENSE("GPL v2"); |