linux-kernel - [PATCH 20/24] irqchip: mips-gic: Use separate edge/level irq

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Date:	Mon, 15 Sep 2014 16:51:23 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	Jeffrey Deans <jeffrey.deans@...tec.com>,
	Markos Chandras <markos.chandras@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Qais Yousef <qais.yousef@...tec.com>,
	Jonas Gorski <jogo@...nwrt.org>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 20/24] irqchip: mips-gic: Use separate edge/level irq_chips

GIC edge-triggered interrupts must be acknowledged by clearing the edge
detector via a write to GIC_SH_WEDGE.  Create a separate edge-triggered
irq_chip with the appropriate irq_ack() callback.  This also allows us
to get rid of gic_irq_flags.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
 arch/mips/include/asm/gic.h    |  1 -
 drivers/irqchip/irq-mips-gic.c | 38 ++++++++++++++++++++++++--------------
 2 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/arch/mips/include/asm/gic.h b/arch/mips/include/asm/gic.h
index 8d1e457..f245395 100644
--- a/arch/mips/include/asm/gic.h
+++ b/arch/mips/include/asm/gic.h
@@ -345,7 +345,6 @@
 extern unsigned int gic_present;
 extern unsigned int gic_frequency;
 extern unsigned long _gic_base;
-extern unsigned int gic_irq_flags[];
 extern unsigned int gic_cpu_pin;
 
 extern void gic_init(unsigned long gic_base_addr,
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index c9ba102..6682a4e 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -24,7 +24,6 @@
 unsigned int gic_frequency;
 unsigned int gic_present;
 unsigned long _gic_base;
-unsigned int gic_irq_flags[GIC_NUM_INTRS];
 unsigned int gic_cpu_pin;
 
 struct gic_pcpu_mask {
@@ -44,6 +43,7 @@ static struct gic_pending_regs pending_regs[NR_CPUS];
 static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
 static struct irq_domain *gic_irq_domain;
 static int gic_shared_intrs;
+static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller;
 
 static void __gic_irq_dispatch(void);
 
@@ -228,11 +228,7 @@ static void gic_ack_irq(struct irq_data *d)
 {
 	unsigned int irq = d->hwirq;
 
-	GIC_CLR_INTR_MASK(irq);
-
-	/* Clear edge detector */
-	if (gic_irq_flags[irq] & GIC_TRIG_EDGE)
-		GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
+	GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
 }
 
 static int gic_set_type(struct irq_data *d, unsigned int type)
@@ -275,11 +271,13 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
 	}
 
 	if (is_edge) {
-		gic_irq_flags[irq] |= GIC_TRIG_EDGE;
-		__irq_set_handler_locked(d->irq, handle_edge_irq);
+		__irq_set_chip_handler_name_locked(d->irq,
+						   &gic_edge_irq_controller,
+						   handle_edge_irq, NULL);
 	} else {
-		gic_irq_flags[irq] &= ~GIC_TRIG_EDGE;
-		__irq_set_handler_locked(d->irq, handle_level_irq);
+		__irq_set_chip_handler_name_locked(d->irq,
+						   &gic_level_irq_controller,
+						   handle_level_irq, NULL);
 	}
 
 	return 0;
@@ -318,11 +316,23 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
 }
 #endif
 
-static struct irq_chip gic_irq_controller = {
+static struct irq_chip gic_level_irq_controller = {
+	.name			=	"MIPS GIC",
+	.irq_ack		=	gic_mask_irq,
+	.irq_mask		=	gic_mask_irq,
+	.irq_mask_ack		=	gic_mask_irq,
+	.irq_unmask		=	gic_unmask_irq,
+	.irq_eoi		=	gic_unmask_irq,
+	.irq_set_type		=	gic_set_type,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	=	gic_set_affinity,
+#endif
+};
+
+static struct irq_chip gic_edge_irq_controller = {
 	.name			=	"MIPS GIC",
 	.irq_ack		=	gic_ack_irq,
 	.irq_mask		=	gic_mask_irq,
-	.irq_mask_ack		=	gic_ack_irq,
 	.irq_unmask		=	gic_unmask_irq,
 	.irq_eoi		=	gic_unmask_irq,
 	.irq_set_type		=	gic_set_type,
@@ -433,7 +443,6 @@ static void __init gic_basic_init(int numvpes)
 		GIC_SET_POLARITY(i, GIC_POL_POS);
 		GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
 		GIC_CLR_INTR_MASK(i);
-		gic_irq_flags[i] = 0;
 	}
 
 	vpe_local_setup(numvpes);
@@ -442,7 +451,8 @@ static void __init gic_basic_init(int numvpes)
 static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
 			      irq_hw_number_t hw)
 {
-	irq_set_chip_and_handler(virq, &gic_irq_controller, handle_level_irq);
+	irq_set_chip_and_handler(virq, &gic_level_irq_controller,
+				 handle_level_irq);
 
 	GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(hw)),
 		 GIC_MAP_TO_PIN_MSK | gic_cpu_pin);
-- 
2.1.0.rc2.206.gedb03e5

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