linux-kernel - [PATCH 05/12] irqchip: nvic: increase number of external interrupts to 112

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Date:	Wed,  3 Dec 2014 01:12:04 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	shawn.guo@...aro.org, kernel@...gutronix.de,
	linux@....linux.org.uk, u.kleine-koenig@...gutronix.de,
	jason@...edaemon.net, olof@...om.net, arnd@...db.de,
	daniel.lezcano@...aro.org, tglx@...utronix.de,
	mark.rutland@....com, pawel.moll@....com, robh+dt@...nel.org,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH 05/12] irqchip: nvic: increase number of external interrupts to 112

So far only vectors for up to 48 external interrupts have been
registred in the vector table. Increase the amount of registred
external vectors to 112. Also, add a warning in case NVIC reports
support for more interrupts than 128.

Note: the vector table must align to the number of entires in the
vector table, hence increase the alignment to 0x200.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 arch/arm/kernel/entry-v7m.S | 6 +++---
 drivers/irqchip/irq-nvic.c  | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
index 2260f18..754a1fa 100644
--- a/arch/arm/kernel/entry-v7m.S
+++ b/arch/arm/kernel/entry-v7m.S
@@ -115,7 +115,7 @@ ENTRY(__switch_to)
 ENDPROC(__switch_to)
 
 	.data
-	.align	8
+	.align	9
 /*
  * Vector table (64 words => 256 bytes natural alignment)
  */
@@ -136,6 +136,6 @@ ENTRY(vector_table)
 	.long	__invalid_entry		@ 13 - Reserved
 	.long	__pendsv_entry		@ 14 - PendSV
 	.long	__invalid_entry		@ 15 - SysTick
-	.rept	64 - 16
-	.long	__irq_entry		@ 16..64 - External Interrupts
+	.rept	128 - 16
+	.long	__irq_entry		@ 16..128 - External Interrupts
 	.endr
diff --git a/drivers/irqchip/irq-nvic.c b/drivers/irqchip/irq-nvic.c
index dbfb5be..40f62a9 100644
--- a/drivers/irqchip/irq-nvic.c
+++ b/drivers/irqchip/irq-nvic.c
@@ -137,6 +137,8 @@ static int __init nvic_of_init(struct device_node *node,
 	if (irqs > NVIC_MAX_IRQ)
 		irqs = NVIC_MAX_IRQ;
 
+	WARN(irqs > 128, "vector table in entry-v7m.S configured for 128 irqs");
+
 	nvic_irq_domain =
 		irq_domain_add_linear(node, irqs, &nvic_irq_domain_ops, NULL);
 	if (!nvic_irq_domain) {
-- 
2.1.3

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