1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OF-platform PATA driver
4 *
5 * Copyright (c) 2007  MontaVista Software, Inc.
6 *                     Anton Vorontsov <avorontsov@ru.mvista.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/of_address.h>
12#include <linux/platform_device.h>
13#include <linux/ata_platform.h>
14#include <linux/libata.h>
15
16#define DRV_NAME "pata_of_platform"
17
18static struct scsi_host_template pata_platform_sht = {
19	ATA_PIO_SHT(DRV_NAME),
20};
21
22static int pata_of_platform_probe(struct platform_device *ofdev)
23{
24	int ret;
25	struct device_node *dn = ofdev->dev.of_node;
26	struct resource io_res;
27	struct resource ctl_res;
28	struct resource *irq_res;
29	unsigned int reg_shift = 0;
30	int pio_mode = 0;
31	int pio_mask;
32	bool use16bit;
33
34	ret = of_address_to_resource(dn, 0, &io_res);
35	if (ret) {
36		dev_err(&ofdev->dev, "can't get IO address from "
37			"device tree\n");
38		return -EINVAL;
39	}
40
41	ret = of_address_to_resource(dn, 1, &ctl_res);
42	if (ret) {
43		dev_err(&ofdev->dev, "can't get CTL address from "
44			"device tree\n");
45		return -EINVAL;
46	}
47
48	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
49
50	of_property_read_u32(dn, "reg-shift", &reg_shift);
51
52	if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
53		if (pio_mode > 6) {
54			dev_err(&ofdev->dev, "invalid pio-mode\n");
55			return -EINVAL;
56		}
57	} else {
58		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
59	}
60
61	use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
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				     use16bit);
69}
70
71static const struct of_device_id pata_of_platform_match[] = {
72	{ .compatible = "ata-generic", },
73	{ },
74};
75MODULE_DEVICE_TABLE(of, pata_of_platform_match);
76
77static struct platform_driver pata_of_platform_driver = {
78	.driver = {
79		.name = DRV_NAME,
80		.of_match_table = pata_of_platform_match,
81	},
82	.probe		= pata_of_platform_probe,
83	.remove		= ata_platform_remove_one,
84};
85
86module_platform_driver(pata_of_platform_driver);
87
88MODULE_DESCRIPTION("OF-platform PATA driver");
89MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
90MODULE_LICENSE("GPL");
91