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
pata_of_platform_probe(struct platform_device * ofdev)17 static int __devinit pata_of_platform_probe(struct platform_device *ofdev)
18 {
19 int ret;
20 struct device_node *dn = ofdev->dev.of_node;
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
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 }
50 }
51
52 ret = of_irq_to_resource(dn, 0, &irq_res);
53 if (ret == NO_IRQ)
54 irq_res.start = irq_res.end = 0;
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
pata_of_platform_remove(struct platform_device * ofdev)80 static int __devexit pata_of_platform_remove(struct platform_device *ofdev)
81 {
82 return __pata_platform_remove(&ofdev->dev);
83 }
84
85 static struct of_device_id pata_of_platform_match[] = {
86 { .compatible = "ata-generic", },
87 { .compatible = "electra-ide", },
88 {},
89 };
90 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
91
92 static struct platform_driver pata_of_platform_driver = {
93 .driver = {
94 .name = "pata_of_platform",
95 .owner = THIS_MODULE,
96 .of_match_table = pata_of_platform_match,
97 },
98 .probe = pata_of_platform_probe,
99 .remove = __devexit_p(pata_of_platform_remove),
100 };
101
pata_of_platform_init(void)102 static int __init pata_of_platform_init(void)
103 {
104 return platform_driver_register(&pata_of_platform_driver);
105 }
106 module_init(pata_of_platform_init);
107
pata_of_platform_exit(void)108 static void __exit pata_of_platform_exit(void)
109 {
110 platform_driver_unregister(&pata_of_platform_driver);
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");
117