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 #define DRV_NAME "pata_of_platform"
20 
21 static struct scsi_host_template pata_platform_sht = {
22 	ATA_PIO_SHT(DRV_NAME),
23 };
24 
25 static int pata_of_platform_probe(struct platform_device *ofdev)
26 {
27 	int ret;
28 	struct device_node *dn = ofdev->dev.of_node;
29 	struct resource io_res;
30 	struct resource ctl_res;
31 	struct resource *irq_res;
32 	unsigned int reg_shift = 0;
33 	int pio_mode = 0;
34 	int pio_mask;
35 
36 	ret = of_address_to_resource(dn, 0, &io_res);
37 	if (ret) {
38 		dev_err(&ofdev->dev, "can't get IO address from "
39 			"device tree\n");
40 		return -EINVAL;
41 	}
42 
43 	ret = of_address_to_resource(dn, 1, &ctl_res);
44 	if (ret) {
45 		dev_err(&ofdev->dev, "can't get CTL address from "
46 			"device tree\n");
47 		return -EINVAL;
48 	}
49 
50 	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
51 
52 	of_property_read_u32(dn, "reg-shift", &reg_shift);
53 
54 	if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
55 		if (pio_mode > 6) {
56 			dev_err(&ofdev->dev, "invalid pio-mode\n");
57 			return -EINVAL;
58 		}
59 	} else {
60 		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
61 	}
62 
63 	pio_mask = 1 << pio_mode;
64 	pio_mask |= (1 << pio_mode) - 1;
65 
66 	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
67 				     reg_shift, pio_mask, &pata_platform_sht);
68 }
69 
70 static struct of_device_id pata_of_platform_match[] = {
71 	{ .compatible = "ata-generic", },
72 	{ },
73 };
74 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
75 
76 static struct platform_driver pata_of_platform_driver = {
77 	.driver = {
78 		.name = DRV_NAME,
79 		.of_match_table = pata_of_platform_match,
80 	},
81 	.probe		= pata_of_platform_probe,
82 	.remove		= ata_platform_remove_one,
83 };
84 
85 module_platform_driver(pata_of_platform_driver);
86 
87 MODULE_DESCRIPTION("OF-platform PATA driver");
88 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
89 MODULE_LICENSE("GPL");
90