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
21static struct scsi_host_template pata_platform_sht = {
22	ATA_PIO_SHT(DRV_NAME),
23};
24
25static 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	const u32 *prop;
36
37	ret = of_address_to_resource(dn, 0, &io_res);
38	if (ret) {
39		dev_err(&ofdev->dev, "can't get IO address from "
40			"device tree\n");
41		return -EINVAL;
42	}
43
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	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
52
53	prop = of_get_property(dn, "reg-shift", NULL);
54	if (prop)
55		reg_shift = be32_to_cpup(prop);
56
57	prop = of_get_property(dn, "pio-mode", NULL);
58	if (prop) {
59		pio_mode = be32_to_cpup(prop);
60		if (pio_mode > 6) {
61			dev_err(&ofdev->dev, "invalid pio-mode\n");
62			return -EINVAL;
63		}
64	} else {
65		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
66	}
67
68	pio_mask = 1 << pio_mode;
69	pio_mask |= (1 << pio_mode) - 1;
70
71	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
72				     reg_shift, pio_mask, &pata_platform_sht);
73}
74
75static struct of_device_id pata_of_platform_match[] = {
76	{ .compatible = "ata-generic", },
77	{ },
78};
79MODULE_DEVICE_TABLE(of, pata_of_platform_match);
80
81static struct platform_driver pata_of_platform_driver = {
82	.driver = {
83		.name = DRV_NAME,
84		.of_match_table = pata_of_platform_match,
85	},
86	.probe		= pata_of_platform_probe,
87	.remove		= ata_platform_remove_one,
88};
89
90module_platform_driver(pata_of_platform_driver);
91
92MODULE_DESCRIPTION("OF-platform PATA driver");
93MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
94MODULE_LICENSE("GPL");
95