linux-kernel - [PATCH 02/21] clocksource/drivers/fttmr010: Set interrupt and shutdown

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Message-Id: <20200318174131.20582-2-daniel.lezcano@linaro.org>
Date:   Wed, 18 Mar 2020 18:41:12 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Joel Stanley <joel@....id.au>
Subject: [PATCH 02/21] clocksource/drivers/fttmr010: Set interrupt and shutdown

From: Joel Stanley <joel@....id.au>

In preparation for supporting the ast2600, pass the shutdown and
interrupt functions to the common init callback.

Reviewed-by: Cédric Le Goater <clg@...d.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Joel Stanley <joel@....id.au>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20191107094218.13210-3-joel@jms.id.au
---
 drivers/clocksource/timer-fttmr010.c | 51 +++++++++++++++++++++++++---
 1 file changed, 46 insertions(+), 5 deletions(-)

diff --git a/drivers/clocksource/timer-fttmr010.c b/drivers/clocksource/timer-fttmr010.c
index c2d30eb9dc72..edb1d5f193f5 100644
--- a/drivers/clocksource/timer-fttmr010.c
+++ b/drivers/clocksource/timer-fttmr010.c
@@ -37,6 +37,11 @@
 #define TIMER3_MATCH2		(0x2c)
 #define TIMER_CR		(0x30)
 
+/*
+ * Control register set to clear for ast2600 only.
+ */
+#define AST2600_TIMER_CR_CLR	(0x3c)
+
 /*
  * Control register (TMC30) bit fields for fttmr010/gemini/moxart timers.
  */
@@ -163,6 +168,16 @@ static int fttmr010_timer_set_next_event(unsigned long cycles,
 	return 0;
 }
 
+static int ast2600_timer_shutdown(struct clock_event_device *evt)
+{
+	struct fttmr010 *fttmr010 = to_fttmr010(evt);
+
+	/* Stop */
+	writel(fttmr010->t1_enable_val, fttmr010->base + AST2600_TIMER_CR_CLR);
+
+	return 0;
+}
+
 static int fttmr010_timer_shutdown(struct clock_event_device *evt)
 {
 	struct fttmr010 *fttmr010 = to_fttmr010(evt);
@@ -244,7 +259,21 @@ static irqreturn_t fttmr010_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
+static irqreturn_t ast2600_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+	struct fttmr010 *fttmr010 = to_fttmr010(evt);
+
+	writel(0x1, fttmr010->base + TIMER_INTR_STATE);
+
+	evt->event_handler(evt);
+	return IRQ_HANDLED;
+}
+
+static int __init fttmr010_common_init(struct device_node *np,
+		bool is_aspeed,
+		int (*timer_shutdown)(struct clock_event_device *),
+		irq_handler_t irq_handler)
 {
 	struct fttmr010 *fttmr010;
 	int irq;
@@ -345,7 +374,7 @@ static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
 				     fttmr010->tick_rate);
 	}
 
-	fttmr010->timer_shutdown = fttmr010_timer_shutdown;
+	fttmr010->timer_shutdown = timer_shutdown;
 
 	/*
 	 * Setup clockevent timer (interrupt-driven) on timer 1.
@@ -354,7 +383,7 @@ static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
 	writel(0, fttmr010->base + TIMER1_LOAD);
 	writel(0, fttmr010->base + TIMER1_MATCH1);
 	writel(0, fttmr010->base + TIMER1_MATCH2);
-	ret = request_irq(irq, fttmr010_timer_interrupt, IRQF_TIMER,
+	ret = request_irq(irq, irq_handler, IRQF_TIMER,
 			  "FTTMR010-TIMER1", &fttmr010->clkevt);
 	if (ret) {
 		pr_err("FTTMR010-TIMER1 no IRQ\n");
@@ -401,14 +430,25 @@ static int __init fttmr010_common_init(struct device_node *np, bool is_aspeed)
 	return ret;
 }
 
+static __init int ast2600_timer_init(struct device_node *np)
+{
+	return fttmr010_common_init(np, true,
+			ast2600_timer_shutdown,
+			ast2600_timer_interrupt);
+}
+
 static __init int aspeed_timer_init(struct device_node *np)
 {
-	return fttmr010_common_init(np, true);
+	return fttmr010_common_init(np, true,
+			fttmr010_timer_shutdown,
+			fttmr010_timer_interrupt);
 }
 
 static __init int fttmr010_timer_init(struct device_node *np)
 {
-	return fttmr010_common_init(np, false);
+	return fttmr010_common_init(np, false,
+			fttmr010_timer_shutdown,
+			fttmr010_timer_interrupt);
 }
 
 TIMER_OF_DECLARE(fttmr010, "faraday,fttmr010", fttmr010_timer_init);
@@ -416,3 +456,4 @@ TIMER_OF_DECLARE(gemini, "cortina,gemini-timer", fttmr010_timer_init);
 TIMER_OF_DECLARE(moxart, "moxa,moxart-timer", fttmr010_timer_init);
 TIMER_OF_DECLARE(ast2400, "aspeed,ast2400-timer", aspeed_timer_init);
 TIMER_OF_DECLARE(ast2500, "aspeed,ast2500-timer", aspeed_timer_init);
+TIMER_OF_DECLARE(ast2600, "aspeed,ast2600-timer", ast2600_timer_init);
-- 
2.17.1