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 diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile
  19 index 7a13660..087497d 100644
  20 --- a/arch/mips/lantiq/xway/Makefile
  21 +++ b/arch/mips/lantiq/xway/Makefile
  22 @@ -1,3 +1,3 @@
  23 -obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
  24 +obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
  25
  26  obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o
  27 diff --git a/arch/mips/lantiq/xway/dcdc.c b/arch/mips/lantiq/xway/dcdc.c
  28 new file mode 100644
  29 index 0000000..7688ac0
  30 --- /dev/null
  31 +++ b/arch/mips/lantiq/xway/dcdc.c
  32 @@ -0,0 +1,63 @@
  33 +/*
  34 + *  This program is free software; you can redistribute it and/or modify it
  35 + *  under the terms of the GNU General Public License version 2 as published
  36 + *  by the Free Software Foundation.
  37 + *
  38 + *  Copyright (C) 2012 John Crispin <blogic@openwrt.org>
  39 + *  Copyright (C) 2010 Sameer Ahmad, Lantiq GmbH
  40 + */
  41 +
  42 +#include <linux/ioport.h>
  43 +#include <linux/of_platform.h>
  44 +
  45 +#include <lantiq_soc.h>
  46 +
  47 +/* Bias and regulator Setup Register */
  48 +#define DCDC_BIAS_VREG0        0xa
  49 +/* Bias and regulator Setup Register */
  50 +#define DCDC_BIAS_VREG1        0xb
  51 +
  52 +#define dcdc_w8(x, y)  ltq_w8((x), dcdc_membase + (y))
  53 +#define dcdc_r8(x)     ltq_r8(dcdc_membase + (x))
  54 +
  55 +static void __iomem *dcdc_membase;
  56 +
  57 +static int dcdc_probe(struct platform_device *pdev)
  58 +{
  59 +       struct resource *res;
  60 +
  61 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  62 +       dcdc_membase = devm_ioremap_resource(&pdev->dev, res);
  63 +       if (IS_ERR(dcdc_membase))
  64 +               return PTR_ERR(dcdc_membase);
  65 +
  66 +       dev_info(&pdev->dev, "Core Voltage : %d mV\n",
  67 +               dcdc_r8(DCDC_BIAS_VREG1) * 8);
  68 +
  69 +       return 0;
  70 +}
  71 +
  72 +static const struct of_device_id dcdc_match[] = {
  73 +       { .compatible = "lantiq,dcdc-xrx200" },
  74 +       {},
  75 +};
  76 +
  77 +static struct platform_driver dcdc_driver = {
  78 +       .probe = dcdc_probe,
  79 +       .driver = {
  80 +               .name = "dcdc-xrx200",
  81 +               .owner = THIS_MODULE,
  82 +               .of_match_table = dcdc_match,
  83 +       },
  84 +};
  85 +
  86 +int __init dcdc_init(void)
  87 +{
  88 +       int ret = platform_driver_register(&dcdc_driver);
  89 +
  90 +       if (ret)
  91 +               pr_info("dcdc: Error registering platform driver\n");
  92 +       return ret;
  93 +}
  94 +
  95 +arch_initcall(dcdc_init);
  96 --
  97 1.7.10.4
  98