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