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MIPS: i8259: DT support

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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@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: linux-kernel@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/10114/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2015-05-22 16:51:03 +01:00 committed by Ralf Baechle
parent e8823d26b4
commit 5f93ef5cfb
2 changed files with 42 additions and 2 deletions
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1
arch/mips/include/asm/i8259.h
View File

@ -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

43
arch/mips/kernel/i8259.c
View File

@ -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);