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 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
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 = -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", },
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 .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");
115
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