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 * 6 * Copyright (C) 2012 John Crispin <john@phrozen.org> 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", 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); 63