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 const 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	int irq;
34
35	ret = of_address_to_resource(dn, 0, &io_res);
36	if (ret) {
37		dev_err(&ofdev->dev, "can't get IO address from "
38			"device tree\n");
39		return -EINVAL;
40	}
41
42	ret = of_address_to_resource(dn, 1, &ctl_res);
43	if (ret) {
44		dev_err(&ofdev->dev, "can't get CTL address from "
45			"device tree\n");
46		return -EINVAL;
47	}
48
49	memset(&irq_res, 0, sizeof(irq_res));
50
51	irq = platform_get_irq_optional(ofdev, 0);
52	if (irq < 0 && irq != -ENXIO)
53		return irq;
54	if (irq > 0) {
55		irq_res.start = irq;
56		irq_res.end = irq;
57	}
58
59	of_property_read_u32(dn, "reg-shift", &reg_shift);
60
61	if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
62		if (pio_mode > 6) {
63			dev_err(&ofdev->dev, "invalid pio-mode\n");
64			return -EINVAL;
65		}
66	} else {
67		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
68	}
69
70	use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
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 > 0 ? &irq_res : NULL,
76				     reg_shift, pio_mask, &pata_platform_sht,
77				     use16bit);
78}
79
80static const struct of_device_id pata_of_platform_match[] = {
81	{ .compatible = "ata-generic", },
82	{ /* sentinel */ }
83};
84MODULE_DEVICE_TABLE(of, pata_of_platform_match);
85
86static struct platform_driver pata_of_platform_driver = {
87	.driver = {
88		.name = DRV_NAME,
89		.of_match_table = pata_of_platform_match,
90	},
91	.probe		= pata_of_platform_probe,
92	.remove_new	= ata_platform_remove_one,
93};
94
95module_platform_driver(pata_of_platform_driver);
96
97MODULE_DESCRIPTION("OF-platform PATA driver");
98MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
99MODULE_LICENSE("GPL");
100