target/linux/lantiq/patches-3.10/0002-MIPS-lantiq-adds-minimal-dcdc-driver.patch

   1 From 82a678435e9937dc8a7cb801f476e340fcfbc23e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 8 Aug 2013 14:02:23 +0200
   4 Subject: [PATCH 02/34] MIPS: lantiq: adds minimal dcdc driver
   5
   6 This driver so far only reads the core voltage.
   7
   8 Signed-off-by: John Crispin <blogic@openwrt.org>
   9
  10 Acked-by: John Crispin <blogic@openwrt.org>
  11 Patchwork: http://patchwork.linux-mips.org/patch/5677/
  12 ---
  13  arch/mips/lantiq/xway/Makefile |    2 +-
  14  arch/mips/lantiq/xway/dcdc.c   |   63 ++++++++++++++++++++++++++++++++++++++++
  15  2 files changed, 64 insertions(+), 1 deletion(-)
  16  create mode 100644 arch/mips/lantiq/xway/dcdc.c
  17
  18 --- a/arch/mips/lantiq/xway/Makefile
  19 +++ b/arch/mips/lantiq/xway/Makefile
  20 @@ -1,3 +1,3 @@
  21 -obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
  22 +obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
  23
  24  obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o
  25 --- /dev/null
  26 +++ b/arch/mips/lantiq/xway/dcdc.c
  27 @@ -0,0 +1,63 @@
  28 +/*
  29 + *  This program is free software; you can redistribute it and/or modify it
  30 + *  under the terms of the GNU General Public License version 2 as published
  31 + *  by the Free Software Foundation.
  32 + *
  33 + *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
  34 + *  Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
  35 + */
  36 +
  37 +#include <linux/ioport.h>
  38 +#include <linux/of_platform.h>
  39 +
  40 +#include <lantiq_soc.h>
  41 +
  42 +/* Bias and regulator Setup Register */
  43 +#define DCDC_BIAS_VREG0        0xa
  44 +/* Bias and regulator Setup Register */
  45 +#define DCDC_BIAS_VREG1        0xb
  46 +
  47 +#define dcdc_w8(x, y)  ltq_w8((x), dcdc_membase + (y))
  48 +#define dcdc_r8(x)     ltq_r8(dcdc_membase + (x))
  49 +
  50 +static void __iomem *dcdc_membase;
  51 +
  52 +static int dcdc_probe(struct platform_device *pdev)
  53 +{
  54 +       struct resource *res;
  55 +
  56 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  57 +       dcdc_membase = devm_ioremap_resource(&pdev->dev, res);
  58 +       if (IS_ERR(dcdc_membase))
  59 +               return PTR_ERR(dcdc_membase);
  60 +
  61 +       dev_info(&pdev->dev, "Core Voltage : %d mV\n",
  62 +               dcdc_r8(DCDC_BIAS_VREG1) * 8);
  63 +
  64 +       return 0;
  65 +}
  66 +
  67 +static const struct of_device_id dcdc_match[] = {
  68 +       { .compatible = "lantiq,dcdc-xrx200" },
  69 +       {},
  70 +};
  71 +
  72 +static struct platform_driver dcdc_driver = {
  73 +       .probe = dcdc_probe,
  74 +       .driver = {
  75 +               .name = "dcdc-xrx200",
  76 +               .owner = THIS_MODULE,
  77 +               .of_match_table = dcdc_match,
  78 +       },
  79 +};
  80 +
  81 +int __init dcdc_init(void)
  82 +{
  83 +       int ret = platform_driver_register(&dcdc_driver);
  84 +
  85 +       if (ret)
  86 +               pr_info("dcdc: Error registering platform driver\n");
  87 +       return ret;
  88 +}
  89 +
  90 +arch_initcall(dcdc_init);