ARM: mediatek: enable gpt6 on boot up to make arch timer working

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>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c
index a9549005097e..19dc738c1abc 100644
--- a/arch/arm/mach-mediatek/mediatek.c
+++ b/arch/arm/mach-mediatek/mediatek.c
@@ -16,6 +16,32 @@
  */
 #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;
+
+        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);
+
+                /* enable clock and set to free-run */
+                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 +53,5 @@ 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