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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 | 16 | |
1c48a5c9 | 17 | static int __devinit pata_of_platform_probe(struct platform_device *ofdev) |
61f71621 AV |
18 | { |
19 | int ret; | |
61c7a080 | 20 | struct device_node *dn = ofdev->dev.of_node; |
61f71621 AV |
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 | ||
9cd55be4 OJ |
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 | } | |
61f71621 AV |
50 | } |
51 | ||
52 | ret = of_irq_to_resource(dn, 0, &irq_res); | |
53 | if (ret == NO_IRQ) | |
4538d0ca | 54 | irq_res.start = irq_res.end = 0; |
61f71621 AV |
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 | ||
2dc11581 | 80 | static int __devexit pata_of_platform_remove(struct platform_device *ofdev) |
61f71621 AV |
81 | { |
82 | return __pata_platform_remove(&ofdev->dev); | |
83 | } | |
84 | ||
85 | static struct of_device_id pata_of_platform_match[] = { | |
86 | { .compatible = "ata-generic", }, | |
9cd55be4 | 87 | { .compatible = "electra-ide", }, |
61f71621 AV |
88 | {}, |
89 | }; | |
90 | MODULE_DEVICE_TABLE(of, pata_of_platform_match); | |
91 | ||
1c48a5c9 | 92 | static struct platform_driver pata_of_platform_driver = { |
4018294b GL |
93 | .driver = { |
94 | .name = "pata_of_platform", | |
95 | .owner = THIS_MODULE, | |
96 | .of_match_table = pata_of_platform_match, | |
97 | }, | |
61f71621 AV |
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 | { | |
1c48a5c9 | 104 | return platform_driver_register(&pata_of_platform_driver); |
61f71621 AV |
105 | } |
106 | module_init(pata_of_platform_init); | |
107 | ||
108 | static void __exit pata_of_platform_exit(void) | |
109 | { | |
1c48a5c9 | 110 | platform_driver_unregister(&pata_of_platform_driver); |
61f71621 AV |
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"); |