LXR linux/arch/arm/mach-mediatek/mediatek.c

   1/*
   2 * Device Tree support for Mediatek SoCs
   3 *
   4 * Copyright (c) 2014 MundoReader S.L.
   5 * Author: Matthias Brugger <matthias.bgg@gmail.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 */
  17#include <linux/init.h>
  18#include <asm/mach/arch.h>
  19#include <linux/of.h>
  20#include <linux/clk-provider.h>
  21#include <linux/clocksource.h>
  22
  23
  24#define GPT6_CON_MT65xx 0x10008060
  25#define GPT_ENABLE      0x31
  26
  27static void __init mediatek_timer_init(void)
  28{
  29        void __iomem *gpt_base;
  30
  31        if (of_machine_is_compatible("mediatek,mt6589") ||
  32            of_machine_is_compatible("mediatek,mt7623") ||
  33            of_machine_is_compatible("mediatek,mt8135") ||
  34            of_machine_is_compatible("mediatek,mt8127")) {
  35                /* turn on GPT6 which ungates arch timer clocks */
  36                gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
  37
  38                /* enable clock and set to free-run */
  39                writel(GPT_ENABLE, gpt_base);
  40                iounmap(gpt_base);
  41        }
  42
  43        of_clk_init(NULL);
  44        clocksource_probe();
  45};
  46
  47static const char * const mediatek_board_dt_compat[] = {
  48        "mediatek,mt2701",
  49        "mediatek,mt6589",
  50        "mediatek,mt6592",
  51        "mediatek,mt7623",
  52        "mediatek,mt8127",
  53        "mediatek,mt8135",
  54        NULL,
  55};
  56
  57DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
  58        .dt_compat      = mediatek_board_dt_compat,
  59        .init_time      = mediatek_timer_init,
  60MACHINE_END
  61