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    Subject[PATCH v2 5/9] ARM: mediatek: enable gpt6 on boot up to make arch timer working
    Date
    From: Matthias Brugger <matthias.bgg@gmail.com>

    We enable GTP6 which ungates the arch timer clock.
    In the future this should be done in the bootloader.

    Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
    Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
    ---
    arch/arm/mach-mediatek/mediatek.c | 29 +++++++++++++++++++++++++++++
    1 file changed, 29 insertions(+)

    diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c
    index a954900..6b38d67 100644
    --- a/arch/arm/mach-mediatek/mediatek.c
    +++ b/arch/arm/mach-mediatek/mediatek.c
    @@ -16,6 +16,34 @@
    */
    #include <linux/init.h>
    #include <asm/mach/arch.h>
    +#include <linux/of.h>
    +#include <linux/clk-provider.h>
    +#include <linux/clocksource.h>
    +
    +
    +#define GPT6_CON_MT65xx 0x10008060
    +#define GPT_ENABLE 0x31
    +
    +static void __init mediatek_timer_init(void)
    +{
    + void __iomem *gpt_base = 0;
    +
    + if (of_machine_is_compatible("mediatek,mt6589") ||
    + of_machine_is_compatible("mediatek,mt8135") ||
    + of_machine_is_compatible("mediatek,mt8127")) {
    + /* turn on GPT6 which ungates arch timer clocks */
    + gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
    + }
    +
    + /* enabel clock and set to free-run */
    + if (gpt_base) {
    + writel(GPT_ENABLE, gpt_base);
    + iounmap(gpt_base);
    + }
    +
    + of_clk_init(NULL);
    + clocksource_of_init();
    +};

    static const char * const mediatek_board_dt_compat[] = {
    "mediatek,mt6589",
    @@ -27,4 +55,5 @@ static const char * const mediatek_board_dt_compat[] = {

    DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
    .dt_compat = mediatek_board_dt_compat,
    + .init_time = mediatek_timer_init,
    MACHINE_END
    --
    1.8.1.1.dirty


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