linux-kernel - [PATCH] irq-renesas-irqc: simplify irq_set

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Message-Id: <201312140309.31407.sergei.shtylyov@cogentembedded.com>
Date:	Sat, 14 Dec 2013 03:09:31 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	tglx@...utronix.de, linux-sh@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, magnus.damm@...il.com
Subject: [PATCH] irq-renesas-irqc: simplify irq_set_type() method

Value 0 of the sense  selection field of CONFIG_n register means "disable event
detection" and serves in irqc_sense[] for marking the invalid values of the IRQ
type (by just omitting initializers). There is no need for INTC_IRQ_SENSE_VALID
and hence INTC_IRQ_SENSE() as all field values matching to the  valid IRQ types
are non-zero anyway.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

---
The patch is against the 'irq/core' branch of the 'tip.git' repo.

 drivers/irqchip/irq-renesas-irqc.c |   17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

Index: renesas/drivers/irqchip/irq-renesas-irqc.c
===================================================================
--- renesas.orig/drivers/irqchip/irq-renesas-irqc.c
+++ renesas/drivers/irqchip/irq-renesas-irqc.c
@@ -81,15 +81,12 @@ static void irqc_irq_disable(struct irq_
 	iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_STS);
 }
 
-#define INTC_IRQ_SENSE_VALID 0x10
-#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
-
 static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = {
-	[IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x01),
-	[IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x02),
-	[IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x04), /* Synchronous */
-	[IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x08), /* Synchronous */
-	[IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x0c),  /* Synchronous */
+	[IRQ_TYPE_LEVEL_LOW]	= 0x01,
+	[IRQ_TYPE_LEVEL_HIGH]	= 0x02,
+	[IRQ_TYPE_EDGE_FALLING]	= 0x04,	/* Synchronous */
+	[IRQ_TYPE_EDGE_RISING]	= 0x08,	/* Synchronous */
+	[IRQ_TYPE_EDGE_BOTH]	= 0x0c,	/* Synchronous */
 };
 
 static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
@@ -101,12 +98,12 @@ static int irqc_irq_set_type(struct irq_
 
 	irqc_dbg(&p->irq[hw_irq], "sense");
 
-	if (!(value & INTC_IRQ_SENSE_VALID))
+	if (!value)
 		return -EINVAL;
 
 	tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq));
 	tmp &= ~0x3f;
-	tmp |= value ^ INTC_IRQ_SENSE_VALID;
+	tmp |= value;
 	iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq));
 	return 0;
 }
--
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