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/mod_devicetable.h>
10 #include <linux/platform_device.h>
11
12 #include <lantiq_soc.h>
13
14 /* Bias and regulator Setup Register */
15 #define DCDC_BIAS_VREG0 0xa
16 /* Bias and regulator Setup Register */
17 #define DCDC_BIAS_VREG1 0xb
18
19 #define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y))
20 #define dcdc_r8(x) ltq_r8(dcdc_membase + (x))
21
22 static void __iomem *dcdc_membase;
23
24 static int dcdc_probe(struct platform_device *pdev)
25 {
26 dcdc_membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
27 if (IS_ERR(dcdc_membase))
28 return PTR_ERR(dcdc_membase);
29
30 dev_info(&pdev->dev, "Core Voltage : %d mV\n",
31 dcdc_r8(DCDC_BIAS_VREG1) * 8);
32
33 return 0;
34 }
35
36 static const struct of_device_id dcdc_match[] = {
37 { .compatible = "lantiq,dcdc-xrx200" },
38 {},
39 };
40
41 static struct platform_driver dcdc_driver = {
42 .probe = dcdc_probe,
43 .driver = {
44 .name = "dcdc-xrx200",
45 .of_match_table = dcdc_match,
46 },
47 };
48
49 int __init dcdc_init(void)
50 {
51 int ret = platform_driver_register(&dcdc_driver);
52
53 if (ret)
54 pr_info("dcdc: Error registering platform driver\n");
55 return ret;
56 }
57
58 arch_initcall(dcdc_init);
59
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