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61f71621 AV |
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> | |
0a87e3e9 | 15 | #include <linux/ata_platform.h> |
61f71621 AV |
16 | |
17 | static int __devinit pata_of_platform_probe(struct of_device *ofdev, | |
18 | const struct of_device_id *match) | |
19 | { | |
20 | int ret; | |
21 | struct device_node *dn = ofdev->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 | ||
9cd55be4 OJ |
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 | } | |
61f71621 AV |
51 | } |
52 | ||
53 | ret = of_irq_to_resource(dn, 0, &irq_res); | |
54 | if (ret == NO_IRQ) | |
55 | irq_res.start = irq_res.end = -1; | |
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 of_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", }, | |
9cd55be4 | 88 | { .compatible = "electra-ide", }, |
61f71621 AV |
89 | {}, |
90 | }; | |
91 | MODULE_DEVICE_TABLE(of, pata_of_platform_match); | |
92 | ||
93 | static struct of_platform_driver pata_of_platform_driver = { | |
94 | .name = "pata_of_platform", | |
95 | .match_table = pata_of_platform_match, | |
96 | .probe = pata_of_platform_probe, | |
97 | .remove = __devexit_p(pata_of_platform_remove), | |
98 | }; | |
99 | ||
100 | static int __init pata_of_platform_init(void) | |
101 | { | |
102 | return of_register_platform_driver(&pata_of_platform_driver); | |
103 | } | |
104 | module_init(pata_of_platform_init); | |
105 | ||
106 | static void __exit pata_of_platform_exit(void) | |
107 | { | |
108 | of_unregister_platform_driver(&pata_of_platform_driver); | |
109 | } | |
110 | module_exit(pata_of_platform_exit); | |
111 | ||
112 | MODULE_DESCRIPTION("OF-platform PATA driver"); | |
113 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); | |
114 | MODULE_LICENSE("GPL"); |