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
21 static void __iomem *dcdc_membase;
22
dcdc_probe(struct platform_device * pdev)23 static int dcdc_probe(struct platform_device *pdev)
24 {
25 dcdc_membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
26 if (IS_ERR(dcdc_membase))
27 return PTR_ERR(dcdc_membase);
28
29 dev_info(&pdev->dev, "Core Voltage : %d mV\n",
30 dcdc_r8(DCDC_BIAS_VREG1) * 8);
31
32 return 0;
33 }
34
35 static const struct of_device_id dcdc_match[] = {
36 { .compatible = "lantiq,dcdc-xrx200" },
37 {},
38 };
39
40 static struct platform_driver dcdc_driver = {
41 .probe = dcdc_probe,
42 .driver = {
43 .name = "dcdc-xrx200",
44 .of_match_table = dcdc_match,
45 },
46 };
47
dcdc_init(void)48 int __init dcdc_init(void)
49 {
50 int ret = platform_driver_register(&dcdc_driver);
51
52 if (ret)
53 pr_info("dcdc: Error registering platform driver\n");
54 return ret;
55 }
56
57 arch_initcall(dcdc_init);
58