linux-kernel - [PATCH v2 14/20] clocksource/drivers/vf-pit: Enable and disable module on error

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Message-ID: <20250730082725.183133-15-daniel.lezcano@linaro.org>
Date: Wed, 30 Jul 2025 10:27:16 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: daniel.lezcano@...aro.org,
	tglx@...utronix.de
Cc: S32@....com,
	linux-kernel@...r.kernel.org,
	ghennadi.procopciuc@....nxp.com
Subject: [PATCH v2 14/20] clocksource/drivers/vf-pit: Enable and disable module on error

Encapsulate the calls to writel to enable and disable the PIT module
and make use of them. Add the missing module disablement in case of
error.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-vf-pit.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/timer-vf-pit.c b/drivers/clocksource/timer-vf-pit.c
index 96377088a048..609a4d9deb64 100644
--- a/drivers/clocksource/timer-vf-pit.c
+++ b/drivers/clocksource/timer-vf-pit.c
@@ -13,10 +13,12 @@
 /*
  * Each pit takes 0x10 Bytes register space
  */
-#define PITMCR		0x00
 #define PIT0_OFFSET	0x100
 #define PIT_CH(n)       (PIT0_OFFSET + 0x10 * (n))
 
+#define PITMCR(__base)	(__base)
+
+#define PITMCR_FRZ	BIT(0)
 #define PITMCR_MDIS	BIT(1)
 
 #define PITLDVAL(__base)	(__base)
@@ -52,6 +54,16 @@ static inline struct pit_timer *cs_to_pit(struct clocksource *cs)
 	return container_of(cs, struct pit_timer, cs);
 }
 
+static inline void pit_module_enable(void __iomem *base)
+{
+	writel(0, PITMCR(base));
+}
+
+static inline void pit_module_disable(void __iomem *base)
+{
+	writel(PITMCR_MDIS, PITMCR(base));
+}
+
 static inline void pit_timer_enable(struct pit_timer *pit)
 {
 	writel(PITTCTRL_TEN | PITTCTRL_TIE, PITTCTRL(pit->clkevt_base));
@@ -254,11 +266,11 @@ static int __init pit_timer_init(struct device_node *np)
 	clk_rate = clk_get_rate(pit_clk);
 
 	/* enable the pit module */
-	writel(~PITMCR_MDIS, timer_base + PITMCR);
+	pit_module_enable(timer_base);
 
 	ret = pit_clocksource_init(pit, name, timer_base, clk_rate);
 	if (ret)
-		goto out_disable_unprepare;
+		goto out_pit_module_disable;
 
 	ret = pit_clockevent_init(pit, name, timer_base, clk_rate, irq, 0);
 	if (ret)
@@ -268,7 +280,8 @@ static int __init pit_timer_init(struct device_node *np)
 
 out_pit_clocksource_unregister:
 	clocksource_unregister(&pit->cs);
-out_disable_unprepare:
+out_pit_module_disable:
+	pit_module_disable(timer_base);
 	clk_disable_unprepare(pit_clk);
 out_clk_put:
 	clk_put(pit_clk);
-- 
2.43.0