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

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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>
This commit is contained in:
Matthias Brugger 2015-10-02 23:19:37 +08:00
parent 41b3e0f067
commit 9821e545c5
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mach-mediatek/mediatek.c
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@ -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