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 --- a/arch/arm/mach-mediatek/mediatek.c
  17 +++ b/arch/arm/mach-mediatek/mediatek.c
  18 @@ -16,6 +16,34 @@
  19   */
  20  #include <linux/init.h>
  21  #include <asm/mach/arch.h>
  22 +#include <linux/of.h>
  23 +#include <linux/clk-provider.h>
  24 +#include <linux/clocksource.h>
  25 +
  26 +
  27 +#define GPT6_CON_MT65xx 0x10008060
  28 +#define GPT_ENABLE      0x31
  29 +
  30 +static void __init mediatek_timer_init(void)
  31 +{
  32 +       void __iomem *gpt_base = 0;
  33 +
  34 +       if (of_machine_is_compatible("mediatek,mt6589") ||
  35 +           of_machine_is_compatible("mediatek,mt8135") ||
  36 +           of_machine_is_compatible("mediatek,mt8127")) {
  37 +               /* turn on GPT6 which ungates arch timer clocks */
  38 +               gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
  39 +       }
  40 +
  41 +       /* enabel clock and set to free-run */
  42 +       if (gpt_base) {
  43 +               writel(GPT_ENABLE, gpt_base);
  44 +               iounmap(gpt_base);
  45 +       }
  46 +
  47 +       of_clk_init(NULL);
  48 +       clocksource_of_init();
  49 +};
  50
  51  static const char * const mediatek_board_dt_compat[] = {
  52         "mediatek,mt6589",
  53 @@ -27,4 +55,5 @@ static const char * const mediatek_board
  54
  55  DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
  56         .dt_compat      = mediatek_board_dt_compat,
  57 +       .init_time      = mediatek_timer_init,
  58  MACHINE_END