64 lines
1.8 KiB
Diff
64 lines
1.8 KiB
Diff
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From eec99287ace37015ed313b4fc27ba205a158b66c Mon Sep 17 00:00:00 2001
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From: Matthias Brugger <matthias.bgg@gmail.com>
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Date: Fri, 1 May 2015 15:43:26 +0800
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Subject: [PATCH 41/76] arm: mediatek: enable gpt6 on boot up to make arch
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timer working
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We enable GTP6 which ungates the arch timer clock.
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In the future this should be done in the bootloader.
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Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
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Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
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---
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arch/arm/mach-mediatek/mediatek.c | 29 +++++++++++++++++++++++++++++
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1 file changed, 29 insertions(+)
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diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c
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index a954900..6b38d67 100644
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--- a/arch/arm/mach-mediatek/mediatek.c
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+++ b/arch/arm/mach-mediatek/mediatek.c
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@@ -16,6 +16,34 @@
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*/
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#include <linux/init.h>
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#include <asm/mach/arch.h>
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+#include <linux/of.h>
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+#include <linux/clk-provider.h>
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+#include <linux/clocksource.h>
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+
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+
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+#define GPT6_CON_MT65xx 0x10008060
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+#define GPT_ENABLE 0x31
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+
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+static void __init mediatek_timer_init(void)
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+{
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+ void __iomem *gpt_base = 0;
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+
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+ if (of_machine_is_compatible("mediatek,mt6589") ||
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+ of_machine_is_compatible("mediatek,mt8135") ||
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+ of_machine_is_compatible("mediatek,mt8127")) {
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+ /* turn on GPT6 which ungates arch timer clocks */
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+ gpt_base = ioremap(GPT6_CON_MT65xx, 0x04);
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+ }
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+
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+ /* enabel clock and set to free-run */
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+ if (gpt_base) {
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+ writel(GPT_ENABLE, gpt_base);
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+ iounmap(gpt_base);
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+ }
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+
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+ of_clk_init(NULL);
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+ clocksource_of_init();
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+};
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static const char * const mediatek_board_dt_compat[] = {
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"mediatek,mt6589",
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@@ -27,4 +55,5 @@ static const char * const mediatek_board_dt_compat[] = {
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DT_MACHINE_START(MEDIATEK_DT, "Mediatek Cortex-A7 (Device Tree)")
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.dt_compat = mediatek_board_dt_compat,
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+ .init_time = mediatek_timer_init,
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MACHINE_END
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--
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1.7.10.4
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