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Commit 9821e545 authored by Matthias Brugger's avatar Matthias Brugger
Browse files

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: default avatarMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: default avatarYingjoe Chen <yingjoe.chen@mediatek.com>
parent 41b3e0f0

arch/arm/mach-mediatek/mediatek.c

+27 −0
Original line number Diff line number Diff line
@@ -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