1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 *  Copyright (C) 2012 John Crispin <john@phrozen.org>
5 *  Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
6 */
7
8#include <linux/ioport.h>
9#include <linux/of_platform.h>
10
11#include <lantiq_soc.h>
12
13/* Bias and regulator Setup Register */
14#define DCDC_BIAS_VREG0	0xa
15/* Bias and regulator Setup Register */
16#define DCDC_BIAS_VREG1	0xb
17
18#define dcdc_w8(x, y)	ltq_w8((x), dcdc_membase + (y))
19#define dcdc_r8(x)	ltq_r8(dcdc_membase + (x))
20
21static void __iomem *dcdc_membase;
22
23static int dcdc_probe(struct platform_device *pdev)
24{
25	struct resource *res;
26
27	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
28	dcdc_membase = devm_ioremap_resource(&pdev->dev, res);
29	if (IS_ERR(dcdc_membase))
30		return PTR_ERR(dcdc_membase);
31
32	dev_info(&pdev->dev, "Core Voltage : %d mV\n",
33		dcdc_r8(DCDC_BIAS_VREG1) * 8);
34
35	return 0;
36}
37
38static const struct of_device_id dcdc_match[] = {
39	{ .compatible = "lantiq,dcdc-xrx200" },
40	{},
41};
42
43static struct platform_driver dcdc_driver = {
44	.probe = dcdc_probe,
45	.driver = {
46		.name = "dcdc-xrx200",
47		.of_match_table = dcdc_match,
48	},
49};
50
51int __init dcdc_init(void)
52{
53	int ret = platform_driver_register(&dcdc_driver);
54
55	if (ret)
56		pr_info("dcdc: Error registering platform driver\n");
57	return ret;
58}
59
60arch_initcall(dcdc_init);
61