xref: /linux/drivers/ata/pata_of_platform.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
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 
18 static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
19 {
20 	int ret;
21 	struct device_node *dn = ofdev->dev.of_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 	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
54 	if (irq_res)
55 		irq_res->flags = 0;
56 
57 	prop = of_get_property(dn, "reg-shift", NULL);
58 	if (prop)
59 		reg_shift = be32_to_cpup(prop);
60 
61 	prop = of_get_property(dn, "pio-mode", NULL);
62 	if (prop) {
63 		pio_mode = be32_to_cpup(prop);
64 		if (pio_mode > 6) {
65 			dev_err(&ofdev->dev, "invalid pio-mode\n");
66 			return -EINVAL;
67 		}
68 	} else {
69 		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
70 	}
71 
72 	pio_mask = 1 << pio_mode;
73 	pio_mask |= (1 << pio_mode) - 1;
74 
75 	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
76 				     reg_shift, pio_mask);
77 }
78 
79 static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
80 {
81 	return __pata_platform_remove(&ofdev->dev);
82 }
83 
84 static struct of_device_id pata_of_platform_match[] = {
85 	{ .compatible = "ata-generic", },
86 	{ .compatible = "electra-ide", },
87 	{},
88 };
89 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
90 
91 static struct platform_driver pata_of_platform_driver = {
92 	.driver = {
93 		.name = "pata_of_platform",
94 		.owner = THIS_MODULE,
95 		.of_match_table = pata_of_platform_match,
96 	},
97 	.probe		= pata_of_platform_probe,
98 	.remove		= __devexit_p(pata_of_platform_remove),
99 };
100 
101 module_platform_driver(pata_of_platform_driver);
102 
103 MODULE_DESCRIPTION("OF-platform PATA driver");
104 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
105 MODULE_LICENSE("GPL");
106