[PATCH v5 1/5] ARM: mediatek: enable gpt6 on boot up to make arch timer working

[Yingjoe Chen]

From: Matthias Brugger <matthias....@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....@gmail.com>
Signed-off-by: Yingjoe Chen <yingjoe.c...@mediatek.com>
---
 arch/arm/mach-mediatek/mediatek.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm/mach-mediatek/mediatek.c 
b/arch/arm/mach-mediatek/mediatek.c
index a954900..19dc738 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
-- 
1.9.1

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