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Linux/arch/mips/lantiq/xway/dcdc.c

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  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 

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