linux-kernel - [PATCH 1/1] clocksource/timer-risc: Add riscv_clock

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Message-ID: <20231115061811.10041-1-joshua.yeong@starfivetech.com>
Date:   Wed, 15 Nov 2023 14:18:11 +0800
From:   Joshua Yeong <joshua.yeong@...rfivetech.com>
To:     <daniel.lezcano@...aro.org>, <tglx@...utronix.de>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>
CC:     <leyfoon.tan@...rfivetech.com>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>,
        Joshua Yeong <joshua.yeong@...rfivetech.com>
Subject: [PATCH 1/1] clocksource/timer-risc: Add riscv_clock_shutdown callback

Add clocksource detach/shutdown callback to disable RISC-V timer interrupt when
switching out riscv timer as clock source

Signed-off-by: Joshua Yeong <joshua.yeong@...rfivetech.com>
---
 drivers/clocksource/timer-riscv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index da3071b387eb..588a05459b6a 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -50,12 +50,19 @@ static int riscv_clock_next_event(unsigned long delta,
 	return 0;
 }
 
+static int riscv_clock_shutdown(struct clock_event_device *evt)
+{
+	sbi_set_timer(-1);
+	return 0;
+}
+
 static unsigned int riscv_clock_event_irq;
 static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = {
 	.name			= "riscv_timer_clockevent",
 	.features		= CLOCK_EVT_FEAT_ONESHOT,
 	.rating			= 100,
 	.set_next_event		= riscv_clock_next_event,
+	.set_state_shutdown	= riscv_clock_shutdown,
 };
 
 /*
-- 
2.25.1