target/linux/mediatek/patches/0041-arm-mediatek-enable-gpt6-on-boot-up-to-make-arch-tim.patch

   1 From eec99287ace37015ed313b4fc27ba205a158b66c Mon Sep 17 00:00:00 2001
   2 From: Matthias Brugger <matthias.bgg@gmail.com>
   3 Date: Fri, 1 May 2015 15:43:26 +0800
   4 Subject: [PATCH 41/76] arm: mediatek: enable gpt6 on boot up to make arch
   5  timer working
   6
   7 We enable GTP6 which ungates the arch timer clock.
   8 In the future this should be done in the bootloader.
   9
  10 Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
  11 Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
  12 ---
  13  arch/arm/mach-mediatek/mediatek.c |   29 +++++++++++++++++++++++++++++
  14  1 file changed, 29 insertions(+)
  15
  16 diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c
  17 index a954900..6b38d67 100644
  18 --- a/arch/arm/mach-mediatek/mediatek.c
  19 +++ b/arch/arm/mach-mediatek/mediatek.c
  20 @@ -16,6 +16,34 @@
  21   */
  22  #include <linux/init.h>
  23  #include <asm/mach/arch.h>
  24 +#include <linux/of.h>
  25 +#include <linux/clk-provider.h>
  26 +#include <linux/clocksource.h>
  27 +
  28 +
  29 +#define GPT6_CON_MT65xx 0x10008060
  30 +#define GPT_ENABLE      0x31
  31 +
  32 +static void __init mediatek_timer_init(void)
  33 +{
  34 +       void __iomem *gpt_base = 0;
  35 +
  36 +       if (of_machine_is_compatible("mediatek,mt6589") ||
  37 +           of_machine_is_compatible("mediatek,mt8135") ||
  38 +           of_machine_is_compatible("mediatek,mt8127")) {
  39 +               /* turn on GPT6 which ungates arch timer clocks */
  40 +               gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
  41 +       }
  42 +
  43 +       /* enabel clock and set to free-run */
  44 +       if (gpt_base) {
  45 +               writel(GPT_ENABLE, gpt_base);
  46 +               iounmap(gpt_base);
  47 +       }
  48 +
  49 +       of_clk_init(NULL);
  50 +       clocksource_of_init();
  51 +};
  52
  53  static const char * const mediatek_board_dt_compat[] = {
  54         "mediatek,mt6589",
  55 @@ -27,4 +55,5 @@ static const char * const mediatek_board_dt_compat[] = {
  56
  57  DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
  58         .dt_compat      = mediatek_board_dt_compat,
  59 +       .init_time      = mediatek_timer_init,
  60  MACHINE_END
  61 --
  62 1.7.10.4
  63