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Date: Fri, 1 May 2015 15:43:26 +0800 From: Yingjoe Chen <yingjoe.chen@...iatek.com> To: Mark Rutland <mark.rutland@....com>, Matthias Brugger <matthias.bgg@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net> CC: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Russell King <linux@....linux.org.uk>, Daniel Lezcano <daniel.lezcano@...aro.org>, Jason Cooper <jason@...edaemon.net>, Catalin Marinas <catalin.marinas@....com>, Yingjoe Chen <yingjoe.chen@...iatek.com>, Marc Carino <marc.ceeeee@...il.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>, Sascha Hauer <kernel@...gutronix.de> Subject: [PATCH 3/7] arm: mediatek: enable gpt6 on boot up to make arch timer working From: Matthias Brugger <matthias.bgg@...il.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.bgg@...il.com> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com> --- arch/arm/mach-mediatek/mediatek.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/arch/arm/mach-mediatek/mediatek.c b/arch/arm/mach-mediatek/mediatek.c index a954900..6b38d67 100644 --- a/arch/arm/mach-mediatek/mediatek.c +++ b/arch/arm/mach-mediatek/mediatek.c @@ -16,6 +16,34 @@ */ #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 = 0; + + 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); + } + + /* enabel clock and set to free-run */ + if (gpt_base) { + 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 +55,5 @@ 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 -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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