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Message-ID: <1432309875-9712-5-git-send-email-paul.burton@imgtec.com>
Date: Fri, 22 May 2015 16:51:03 +0100
From: Paul Burton <paul.burton@...tec.com>
To: <linux-mips@...ux-mips.org>
CC: <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"Paul Burton" <paul.burton@...tec.com>,
Qais Yousef <qais.yousef@...tec.com>,
"Andrew Bresticker" <abrestic@...omium.org>,
<linux-kernel@...r.kernel.org>,
"Ralf Baechle" <ralf@...ux-mips.org>
Subject: [PATCH 04/15] MIPS: i8259: DT support
Support probing the i8259 programmable interrupt controller, as found on
the Malta board, and using its interrupts via device tree.
Signed-off-by: Paul Burton <paul.burton@...tec.com>
---
arch/mips/include/asm/i8259.h | 1 +
arch/mips/kernel/i8259.c | 43 +++++++++++++++++++++++++++++++++++++++++--
2 files changed, 42 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/asm/i8259.h b/arch/mips/include/asm/i8259.h
index c7e2784..a7fbcd6 100644
--- a/arch/mips/include/asm/i8259.h
+++ b/arch/mips/include/asm/i8259.h
@@ -41,6 +41,7 @@ extern int i8259A_irq_pending(unsigned int irq);
extern void make_8259A_irq(unsigned int irq);
extern void init_i8259_irqs(void);
+extern int i8259_of_init(struct device_node *node, struct device_node *parent);
/*
* Do the traditional i8259 interrupt polling thing. This is for the few
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index a74ec3a..74f6752 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -14,6 +14,7 @@
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
+#include <linux/of_irq.h>
#include <linux/spinlock.h>
#include <linux/syscore_ops.h>
#include <linux/irq.h>
@@ -21,6 +22,8 @@
#include <asm/i8259.h>
#include <asm/io.h>
+#include "../../drivers/irqchip/irqchip.h"
+
/*
* This is the 'legacy' 8259A Programmable Interrupt Controller,
* present in the majority of PC/AT boxes.
@@ -327,7 +330,7 @@ static struct irq_domain_ops i8259A_ops = {
* driver compatibility reasons interrupts 0 - 15 to be the i8259
* interrupts even if the hardware uses a different interrupt numbering.
*/
-void __init init_i8259_irqs(void)
+struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
{
struct irq_domain *domain;
@@ -336,10 +339,46 @@ void __init init_i8259_irqs(void)
init_8259A(0);
- domain = irq_domain_add_legacy(NULL, 16, I8259A_IRQ_BASE, 0,
+ domain = irq_domain_add_legacy(node, 16, I8259A_IRQ_BASE, 0,
&i8259A_ops, NULL);
if (!domain)
panic("Failed to add i8259 IRQ domain");
setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
+ return domain;
+}
+
+void __init init_i8259_irqs(void)
+{
+ __init_i8259_irqs(NULL);
+}
+
+static void i8259_irq_dispatch(unsigned int irq, struct irq_desc *desc)
+{
+ struct irq_domain *domain = irq_get_handler_data(irq);
+ int hwirq = i8259_irq();
+
+ if (hwirq < 0)
+ return;
+
+ irq = irq_linear_revmap(domain, hwirq);
+ generic_handle_irq(irq);
+}
+
+int __init i8259_of_init(struct device_node *node, struct device_node *parent)
+{
+ struct irq_domain *domain;
+ unsigned int parent_irq;
+
+ parent_irq = irq_of_parse_and_map(node, 0);
+ if (!parent_irq) {
+ pr_err("Failed to map i8259 parent IRQ\n");
+ return -ENODEV;
+ }
+
+ domain = __init_i8259_irqs(node);
+ irq_set_handler_data(parent_irq, domain);
+ irq_set_chained_handler(parent_irq, i8259_irq_dispatch);
+ return 0;
}
+IRQCHIP_DECLARE(i8259, "intel,i8259", i8259_of_init);
--
2.4.1
--
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