Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[pandora-kernel.git] / drivers / ata / pata_of_platform.c
1 /*
2  * OF-platform PATA driver
3  *
4  * Copyright (c) 2007  MontaVista Software, Inc.
5  *                     Anton Vorontsov <avorontsov@ru.mvista.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License (Version 2) as
9  * published by the Free Software Foundation.
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of_address.h>
15 #include <linux/of_irq.h>
16 #include <linux/of_platform.h>
17 #include <linux/ata_platform.h>
18
19 static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
20 {
21         int ret;
22         struct device_node *dn = ofdev->dev.of_node;
23         struct resource io_res;
24         struct resource ctl_res;
25         struct resource irq_res;
26         unsigned int reg_shift = 0;
27         int pio_mode = 0;
28         int pio_mask;
29         const u32 *prop;
30
31         ret = of_address_to_resource(dn, 0, &io_res);
32         if (ret) {
33                 dev_err(&ofdev->dev, "can't get IO address from "
34                         "device tree\n");
35                 return -EINVAL;
36         }
37
38         if (of_device_is_compatible(dn, "electra-ide")) {
39                 /* Altstatus is really at offset 0x3f6 from the primary window
40                  * on electra-ide. Adjust ctl_res and io_res accordingly.
41                  */
42                 ctl_res = io_res;
43                 ctl_res.start = ctl_res.start+0x3f6;
44                 io_res.end = ctl_res.start-1;
45         } else {
46                 ret = of_address_to_resource(dn, 1, &ctl_res);
47                 if (ret) {
48                         dev_err(&ofdev->dev, "can't get CTL address from "
49                                 "device tree\n");
50                         return -EINVAL;
51                 }
52         }
53
54         ret = of_irq_to_resource(dn, 0, &irq_res);
55         if (!ret)
56                 irq_res.start = irq_res.end = 0;
57         else
58                 irq_res.flags = 0;
59
60         prop = of_get_property(dn, "reg-shift", NULL);
61         if (prop)
62                 reg_shift = be32_to_cpup(prop);
63
64         prop = of_get_property(dn, "pio-mode", NULL);
65         if (prop) {
66                 pio_mode = be32_to_cpup(prop);
67                 if (pio_mode > 6) {
68                         dev_err(&ofdev->dev, "invalid pio-mode\n");
69                         return -EINVAL;
70                 }
71         } else {
72                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
73         }
74
75         pio_mask = 1 << pio_mode;
76         pio_mask |= (1 << pio_mode) - 1;
77
78         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
79                                      reg_shift, pio_mask);
80 }
81
82 static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
83 {
84         return __pata_platform_remove(&ofdev->dev);
85 }
86
87 static struct of_device_id pata_of_platform_match[] = {
88         { .compatible = "ata-generic", },
89         { .compatible = "electra-ide", },
90         {},
91 };
92 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
93
94 static struct platform_driver pata_of_platform_driver = {
95         .driver = {
96                 .name = "pata_of_platform",
97                 .owner = THIS_MODULE,
98                 .of_match_table = pata_of_platform_match,
99         },
100         .probe          = pata_of_platform_probe,
101         .remove         = __devexit_p(pata_of_platform_remove),
102 };
103
104 static int __init pata_of_platform_init(void)
105 {
106         return platform_driver_register(&pata_of_platform_driver);
107 }
108 module_init(pata_of_platform_init);
109
110 static void __exit pata_of_platform_exit(void)
111 {
112         platform_driver_unregister(&pata_of_platform_driver);
113 }
114 module_exit(pata_of_platform_exit);
115
116 MODULE_DESCRIPTION("OF-platform PATA driver");
117 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
118 MODULE_LICENSE("GPL");