John Crispin | 45d3f18 | 2013-08-08 14:02:23 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it |
| 3 | * under the terms of the GNU General Public License version 2 as published |
| 4 | * by the Free Software Foundation. |
| 5 | * |
John Crispin | 97b9210 | 2016-05-05 09:57:56 +0200 | [diff] [blame] | 6 | * Copyright (C) 2012 John Crispin <john@phrozen.org> |
John Crispin | 45d3f18 | 2013-08-08 14:02:23 +0200 | [diff] [blame] | 7 | * Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH |
| 8 | */ |
| 9 | |
| 10 | #include <linux/ioport.h> |
| 11 | #include <linux/of_platform.h> |
| 12 | |
| 13 | #include <lantiq_soc.h> |
| 14 | |
| 15 | /* Bias and regulator Setup Register */ |
| 16 | #define DCDC_BIAS_VREG0 0xa |
| 17 | /* Bias and regulator Setup Register */ |
| 18 | #define DCDC_BIAS_VREG1 0xb |
| 19 | |
| 20 | #define dcdc_w8(x, y) ltq_w8((x), dcdc_membase + (y)) |
| 21 | #define dcdc_r8(x) ltq_r8(dcdc_membase + (x)) |
| 22 | |
| 23 | static void __iomem *dcdc_membase; |
| 24 | |
| 25 | static int dcdc_probe(struct platform_device *pdev) |
| 26 | { |
| 27 | struct resource *res; |
| 28 | |
| 29 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 30 | dcdc_membase = devm_ioremap_resource(&pdev->dev, res); |
| 31 | if (IS_ERR(dcdc_membase)) |
| 32 | return PTR_ERR(dcdc_membase); |
| 33 | |
| 34 | dev_info(&pdev->dev, "Core Voltage : %d mV\n", |
| 35 | dcdc_r8(DCDC_BIAS_VREG1) * 8); |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static const struct of_device_id dcdc_match[] = { |
| 41 | { .compatible = "lantiq,dcdc-xrx200" }, |
| 42 | {}, |
| 43 | }; |
| 44 | |
| 45 | static struct platform_driver dcdc_driver = { |
| 46 | .probe = dcdc_probe, |
| 47 | .driver = { |
| 48 | .name = "dcdc-xrx200", |
John Crispin | 45d3f18 | 2013-08-08 14:02:23 +0200 | [diff] [blame] | 49 | .of_match_table = dcdc_match, |
| 50 | }, |
| 51 | }; |
| 52 | |
| 53 | int __init dcdc_init(void) |
| 54 | { |
| 55 | int ret = platform_driver_register(&dcdc_driver); |
| 56 | |
| 57 | if (ret) |
| 58 | pr_info("dcdc: Error registering platform driver\n"); |
| 59 | return ret; |
| 60 | } |
| 61 | |
| 62 | arch_initcall(dcdc_init); |