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authorMatthias Brugger <matthias.bgg@gmail.com>2015-10-02 17:19:37 +0200
committerMatthias Brugger <matthias.bgg@gmail.com>2015-10-14 15:34:44 +0200
commit9821e545c5e02ac28af7c595ce71d037a1f74dc9 (patch)
tree987f838e8baaeb2ea808b630f87dde5ba9db481b /arch/arm/mach-mediatek
parentsoc: mediatek: Fix random hang up issue while kernel init (diff)
downloadlinux-9821e545c5e02ac28af7c595ce71d037a1f74dc9.tar.xz
linux-9821e545c5e02ac28af7c595ce71d037a1f74dc9.zip
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>
Diffstat (limited to 'arch/arm/mach-mediatek')
-rw-r--r--arch/arm/mach-mediatek/mediatek.c27
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