From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greentime Hu Subject: [PATCH v5 38/39] clocksource/drivers/atcpit100: VDSO support Date: Tue, 2 Jan 2018 16:25:10 +0800 Message-ID: <6b4a78e31047d10af4fae184a2d3247b5d8a7a07.1514874858.git.green.hu@gmail.com> References: Return-path: In-Reply-To: In-Reply-To: References: Sender: linux-arch-owner@vger.kernel.org To: greentime@andestech.com, linux-kernel@vger.kernel.org, arnd@arndb.de, linux-arch@vger.kernel.org, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, robh+dt@kernel.org, netdev@vger.kernel.org, deanbo422@gmail.com, devicetree@vger.kernel.org, viro@zeniv.linux.org.uk, dhowells@redhat.com, will.deacon@arm.com, daniel.lezcano@linaro.org, linux-serial@vger.kernel.org, geert.uytterhoeven@gmail.com, linus.walleij@linaro.org, mark.rutland@arm.com, greg@kroah.com, ren_guo@c-sky.com, rdunlap@infradead.org, davem@davemloft.net, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com Cc: Rick Chen , green.hu@gmail.com, Vincent Chen List-Id: devicetree@vger.kernel.org From: Rick Chen VDSO needs real-time cycle count to ensure the time accuracy. Unlike others, nds32 architecture does not define clock source, hence VDSO needs atcpit100 offering real-time cycle count to derive the correct time. Signed-off-by: Vincent Chen Signed-off-by: Rick Chen Signed-off-by: Greentime Hu --- drivers/clocksource/timer-atcpit100.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/clocksource/timer-atcpit100.c b/drivers/clocksource/timer-atcpit100.c index 0077fdb..9b2b628 100644 --- a/drivers/clocksource/timer-atcpit100.c +++ b/drivers/clocksource/timer-atcpit100.c @@ -29,6 +29,9 @@ #include #include #include "timer-of.h" +#ifdef CONFIG_NDS32 +#include +#endif /* * Definition of register offsets @@ -211,6 +214,17 @@ static u64 notrace atcpit100_timer_sched_read(void) return ~readl(timer_of_base(&to) + CH1_CNT); } +#ifdef CONFIG_NDS32 +static void fill_vdso_need_info(struct device_node *node) +{ + struct resource timer_res; + of_address_to_resource(node, 0, &timer_res); + timer_info.mapping_base = (unsigned long)timer_res.start; + timer_info.cycle_count_down = true; + timer_info.cycle_count_reg_offset = CH1_CNT; +} +#endif + static int __init atcpit100_timer_init(struct device_node *node) { int ret; @@ -249,6 +263,10 @@ static int __init atcpit100_timer_init(struct device_node *node) val = readl(base + INT_EN); writel(val | CH0INT0EN, base + INT_EN); +#ifdef CONFIG_NDS32 + fill_vdso_need_info(node); +#endif + return ret; } -- 1.7.9.5