From: Greentime Hu <green.hu@gmail.com>
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 <rickchen36@gmail.com>,
green.hu@gmail.com, rick@andestech.com,
Vincent Chen <vincentc@andestech.com>
Subject: [PATCH v6 2/3] clocksource/drivers/atcpit100: VDSO support
Date: Mon, 15 Jan 2018 13:57:30 +0800 [thread overview]
Message-ID: <de648d211061a16c85ae0321625c51343ce5e5ce.1515766198.git.green.hu@gmail.com> (raw)
In-Reply-To: <cover.1515766198.git.green.hu@gmail.com>
In-Reply-To: <cover.1515766198.git.green.hu@gmail.com>
From: Rick Chen <rickchen36@gmail.com>
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 <vincentc@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Signed-off-by: Greentime Hu <green.hu@gmail.com>
---
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 e34b2fe..4cf69e2 100644
--- a/drivers/clocksource/timer-atcpit100.c
+++ b/drivers/clocksource/timer-atcpit100.c
@@ -18,6 +18,9 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include "timer-of.h"
+#ifdef CONFIG_NDS32
+#include <asm/vdso_timer_info.h>
+#endif
/*
* Definition of register offsets
@@ -200,6 +203,17 @@ 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;
@@ -238,6 +252,10 @@ 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
next prev parent reply other threads:[~2018-01-15 5:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-15 5:57 [PATCH v6 0/3] clocksource/drivers/atcpit100: Add andestech atcpit100 timer Greentime Hu
2018-01-15 5:57 ` [PATCH v6 1/3] " Greentime Hu
2018-01-15 5:57 ` Greentime Hu [this message]
2018-01-18 11:08 ` [PATCH v6 2/3] clocksource/drivers/atcpit100: VDSO support Arnd Bergmann
2018-01-20 11:11 ` Vincent Chen
2018-01-20 11:23 ` Vincent Chen
2018-01-15 5:57 ` [PATCH v6 3/3] dt-bindings: timer: Add andestech atcpit100 timer binding doc Greentime Hu
2018-01-18 11:04 ` Arnd Bergmann
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