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 23 static int dcdc_probe(struct platform_device *pdev) 24 { 25 struct resource *res; 26 27 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 28 dcdc_membase = devm_ioremap_resource(&pdev->dev, res); 29 if (IS_ERR(dcdc_membase)) 30 return PTR_ERR(dcdc_membase); 31 32 dev_info(&pdev->dev, "Core Voltage : %d mV\n", 33 dcdc_r8(DCDC_BIAS_VREG1) * 8); 34 35 return 0; 36 } 37 38 static const struct of_device_id dcdc_match[] = { 39 { .compatible = "lantiq,dcdc-xrx200" }, 40 {}, 41 }; 42 43 static struct platform_driver dcdc_driver = { 44 .probe = dcdc_probe, 45 .driver = { 46 .name = "dcdc-xrx200", 47 .of_match_table = dcdc_match, 48 }, 49 }; 50 51 int __init dcdc_init(void) 52 { 53 int ret = platform_driver_register(&dcdc_driver); 54 55 if (ret) 56 pr_info("dcdc: Error registering platform driver\n"); 57 return ret; 58 } 59 60 arch_initcall(dcdc_init); 61