Merge branch 'for-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[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_platform.h>
15 #include <linux/ata_platform.h>
16
17 static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
18 {
19         int ret;
20         struct device_node *dn = ofdev->dev.of_node;
21         struct resource io_res;
22         struct resource ctl_res;
23         struct resource irq_res;
24         unsigned int reg_shift = 0;
25         int pio_mode = 0;
26         int pio_mask;
27         const u32 *prop;
28
29         ret = of_address_to_resource(dn, 0, &io_res);
30         if (ret) {
31                 dev_err(&ofdev->dev, "can't get IO address from "
32                         "device tree\n");
33                 return -EINVAL;
34         }
35
36         if (of_device_is_compatible(dn, "electra-ide")) {
37                 /* Altstatus is really at offset 0x3f6 from the primary window
38                  * on electra-ide. Adjust ctl_res and io_res accordingly.
39                  */
40                 ctl_res = io_res;
41                 ctl_res.start = ctl_res.start+0x3f6;
42                 io_res.end = ctl_res.start-1;
43         } else {
44                 ret = of_address_to_resource(dn, 1, &ctl_res);
45                 if (ret) {
46                         dev_err(&ofdev->dev, "can't get CTL address from "
47                                 "device tree\n");
48                         return -EINVAL;
49                 }
50         }
51
52         ret = of_irq_to_resource(dn, 0, &irq_res);
53         if (ret == NO_IRQ)
54                 irq_res.start = irq_res.end = 0;
55         else
56                 irq_res.flags = 0;
57
58         prop = of_get_property(dn, "reg-shift", NULL);
59         if (prop)
60                 reg_shift = *prop;
61
62         prop = of_get_property(dn, "pio-mode", NULL);
63         if (prop) {
64                 pio_mode = *prop;
65                 if (pio_mode > 6) {
66                         dev_err(&ofdev->dev, "invalid pio-mode\n");
67                         return -EINVAL;
68                 }
69         } else {
70                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
71         }
72
73         pio_mask = 1 << pio_mode;
74         pio_mask |= (1 << pio_mode) - 1;
75
76         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
77                                      reg_shift, pio_mask);
78 }
79
80 static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
81 {
82         return __pata_platform_remove(&ofdev->dev);
83 }
84
85 static struct of_device_id pata_of_platform_match[] = {
86         { .compatible = "ata-generic", },
87         { .compatible = "electra-ide", },
88         {},
89 };
90 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
91
92 static struct platform_driver pata_of_platform_driver = {
93         .driver = {
94                 .name = "pata_of_platform",
95                 .owner = THIS_MODULE,
96                 .of_match_table = pata_of_platform_match,
97         },
98         .probe          = pata_of_platform_probe,
99         .remove         = __devexit_p(pata_of_platform_remove),
100 };
101
102 static int __init pata_of_platform_init(void)
103 {
104         return platform_driver_register(&pata_of_platform_driver);
105 }
106 module_init(pata_of_platform_init);
107
108 static void __exit pata_of_platform_exit(void)
109 {
110         platform_driver_unregister(&pata_of_platform_driver);
111 }
112 module_exit(pata_of_platform_exit);
113
114 MODULE_DESCRIPTION("OF-platform PATA driver");
115 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
116 MODULE_LICENSE("GPL");