arch/arm/mach-mediatek/mediatek.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Device Tree support for Mediatek SoCs
   4  *
   5  * Copyright (c) 2014 MundoReader S.L.
   6  * Author: Matthias Brugger <matthias.bgg@gmail.com>
   7  */
   8 #include <linux/init.h>
   9 #include <linux/io.h>
  10 #include <asm/mach/arch.h>
  11 #include <linux/of.h>
  12 #include <linux/of_clk.h>
  13 #include <linux/clocksource.h>
  14
  15
  16 #define GPT6_CON_MT65xx 0x10008060
  17 #define GPT_ENABLE      0x31
  18
  19 static void __init mediatek_timer_init(void)
  20 {
  21         void __iomem *gpt_base;
  22
  23         if (of_machine_is_compatible("mediatek,mt6589") ||
  24             of_machine_is_compatible("mediatek,mt7623") ||
  25             of_machine_is_compatible("mediatek,mt8135") ||
  26             of_machine_is_compatible("mediatek,mt8127")) {
  27                 /* turn on GPT6 which ungates arch timer clocks */
  28                 gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
  29
  30                 /* enable clock and set to free-run */
  31                 writel(GPT_ENABLE, gpt_base);
  32                 iounmap(gpt_base);
  33         }
  34
  35         of_clk_init(NULL);
  36         timer_probe();
  37 };
  38
  39 static const char * const mediatek_board_dt_compat[] = {
  40         "mediatek,mt2701",
  41         "mediatek,mt6589",
  42         "mediatek,mt6592",
  43         "mediatek,mt7623",
  44         "mediatek,mt7629",
  45         "mediatek,mt8127",
  46         "mediatek,mt8135",
  47         NULL,
  48 };
  49
  50 DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
  51         .dt_compat      = mediatek_board_dt_compat,
  52         .init_time      = mediatek_timer_init,
  53 MACHINE_END