1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2012 John Crispin <john@phrozen.org>
5*4882a593Smuzhiyun * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/ioport.h>
9*4882a593Smuzhiyun #include <linux/of_platform.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <lantiq_soc.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /* Bias and regulator Setup Register */
14*4882a593Smuzhiyun #define DCDC_BIAS_VREG0 0xa
15*4882a593Smuzhiyun /* Bias and regulator Setup Register */
16*4882a593Smuzhiyun #define DCDC_BIAS_VREG1 0xb
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y))
19*4882a593Smuzhiyun #define dcdc_r8(x) ltq_r8(dcdc_membase + (x))
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static void __iomem *dcdc_membase;
22*4882a593Smuzhiyun
dcdc_probe(struct platform_device * pdev)23*4882a593Smuzhiyun static int dcdc_probe(struct platform_device *pdev)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct resource *res;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
28*4882a593Smuzhiyun dcdc_membase = devm_ioremap_resource(&pdev->dev, res);
29*4882a593Smuzhiyun if (IS_ERR(dcdc_membase))
30*4882a593Smuzhiyun return PTR_ERR(dcdc_membase);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun dev_info(&pdev->dev, "Core Voltage : %d mV\n",
33*4882a593Smuzhiyun dcdc_r8(DCDC_BIAS_VREG1) * 8);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return 0;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun static const struct of_device_id dcdc_match[] = {
39*4882a593Smuzhiyun { .compatible = "lantiq,dcdc-xrx200" },
40*4882a593Smuzhiyun {},
41*4882a593Smuzhiyun };
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun static struct platform_driver dcdc_driver = {
44*4882a593Smuzhiyun .probe = dcdc_probe,
45*4882a593Smuzhiyun .driver = {
46*4882a593Smuzhiyun .name = "dcdc-xrx200",
47*4882a593Smuzhiyun .of_match_table = dcdc_match,
48*4882a593Smuzhiyun },
49*4882a593Smuzhiyun };
50*4882a593Smuzhiyun
dcdc_init(void)51*4882a593Smuzhiyun int __init dcdc_init(void)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun int ret = platform_driver_register(&dcdc_driver);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun if (ret)
56*4882a593Smuzhiyun pr_info("dcdc: Error registering platform driver\n");
57*4882a593Smuzhiyun return ret;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun arch_initcall(dcdc_init);
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