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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/platform_device.h> |
16 | #include <linux/ata_platform.h> |
17 | #include <linux/libata.h> |
18 | |
19 | static int 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 | irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0); |
55 | if (irq_res) |
56 | irq_res->flags = 0; |
57 | |
58 | prop = of_get_property(dn, "reg-shift", NULL); |
59 | if (prop) |
60 | reg_shift = be32_to_cpup(prop); |
61 | |
62 | prop = of_get_property(dn, "pio-mode", NULL); |
63 | if (prop) { |
64 | pio_mode = be32_to_cpup(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 struct of_device_id pata_of_platform_match[] = { |
81 | { .compatible = "ata-generic", }, |
82 | { .compatible = "electra-ide", }, |
83 | {}, |
84 | }; |
85 | MODULE_DEVICE_TABLE(of, pata_of_platform_match); |
86 | |
87 | static struct platform_driver pata_of_platform_driver = { |
88 | .driver = { |
89 | .name = "pata_of_platform", |
90 | .owner = THIS_MODULE, |
91 | .of_match_table = pata_of_platform_match, |
92 | }, |
93 | .probe = pata_of_platform_probe, |
94 | .remove = ata_platform_remove_one, |
95 | }; |
96 | |
97 | module_platform_driver(pata_of_platform_driver); |
98 | |
99 | MODULE_DESCRIPTION("OF-platform PATA driver"); |
100 | MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); |
101 | MODULE_LICENSE("GPL"); |
102 |
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