pata_arasan_cf: Adding support for arasan compact flash host controller
[linux-2.6.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                                             const struct of_device_id *match)
19 {
20         int ret;
21         struct device_node *dn = ofdev->dev.of_node;
22         struct resource io_res;
23         struct resource ctl_res;
24         struct resource irq_res;
25         unsigned int reg_shift = 0;
26         int pio_mode = 0;
27         int pio_mask;
28         const u32 *prop;
29
30         ret = of_address_to_resource(dn, 0, &io_res);
31         if (ret) {
32                 dev_err(&ofdev->dev, "can't get IO address from "
33                         "device tree\n");
34                 return -EINVAL;
35         }
36
37         if (of_device_is_compatible(dn, "electra-ide")) {
38                 /* Altstatus is really at offset 0x3f6 from the primary window
39                  * on electra-ide. Adjust ctl_res and io_res accordingly.
40                  */
41                 ctl_res = io_res;
42                 ctl_res.start = ctl_res.start+0x3f6;
43                 io_res.end = ctl_res.start-1;
44         } else {
45                 ret = of_address_to_resource(dn, 1, &ctl_res);
46                 if (ret) {
47                         dev_err(&ofdev->dev, "can't get CTL address from "
48                                 "device tree\n");
49                         return -EINVAL;
50                 }
51         }
52
53         ret = of_irq_to_resource(dn, 0, &irq_res);
54         if (ret == NO_IRQ)
55                 irq_res.start = irq_res.end = 0;
56         else
57                 irq_res.flags = 0;
58
59         prop = of_get_property(dn, "reg-shift", NULL);
60         if (prop)
61                 reg_shift = *prop;
62
63         prop = of_get_property(dn, "pio-mode", NULL);
64         if (prop) {
65                 pio_mode = *prop;
66                 if (pio_mode > 6) {
67                         dev_err(&ofdev->dev, "invalid pio-mode\n");
68                         return -EINVAL;
69                 }
70         } else {
71                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
72         }
73
74         pio_mask = 1 << pio_mode;
75         pio_mask |= (1 << pio_mode) - 1;
76
77         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, &irq_res,
78                                      reg_shift, pio_mask);
79 }
80
81 static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
82 {
83         return __pata_platform_remove(&ofdev->dev);
84 }
85
86 static struct of_device_id pata_of_platform_match[] = {
87         { .compatible = "ata-generic", },
88         { .compatible = "electra-ide", },
89         {},
90 };
91 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
92
93 static struct of_platform_driver pata_of_platform_driver = {
94         .driver = {
95                 .name = "pata_of_platform",
96                 .owner = THIS_MODULE,
97                 .of_match_table = pata_of_platform_match,
98         },
99         .probe          = pata_of_platform_probe,
100         .remove         = __devexit_p(pata_of_platform_remove),
101 };
102
103 static int __init pata_of_platform_init(void)
104 {
105         return of_register_platform_driver(&pata_of_platform_driver);
106 }
107 module_init(pata_of_platform_init);
108
109 static void __exit pata_of_platform_exit(void)
110 {
111         of_unregister_platform_driver(&pata_of_platform_driver);
112 }
113 module_exit(pata_of_platform_exit);
114
115 MODULE_DESCRIPTION("OF-platform PATA driver");
116 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
117 MODULE_LICENSE("GPL");