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irq_domain/mips: Allow irq_domain on MIPS 

This patch makes IRQ_DOMAIN usable on MIPS.  It uses an ugly workaround
to preserve current behaviour so that MIPS has time to add irq_domain
registration to the irq controller drivers.  The workaround will be
removed in Linux v3.6

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
This commit is contained in:
Grant Likely 2012-02-24 08:07:06 -07:00
parent b4e518547d
commit abd2363f6a
4 changed files with 14 additions and 18 deletions
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1
arch/mips/Kconfig
View File

@ -2327,6 +2327,7 @@ config USE_OF
bool "Flattened Device Tree support"
select OF
select OF_EARLY_FLATTREE
select IRQ_DOMAIN
help
Include support for flattened device tree machine descriptions.

5
arch/mips/include/asm/irq.h
View File

@ -11,15 +11,12 @@
#include <linux/linkage.h>
#include <linux/smp.h>
#include <linux/irqdomain.h>
#include <asm/mipsmtregs.h>
#include <irq.h>
static inline void irq_dispose_mapping(unsigned int virq)
{
}
#ifdef CONFIG_I8259
static inline int irq_canonicalize(int irq)
{

14
arch/mips/kernel/prom.c
View File

@ -60,20 +60,6 @@ void __init early_init_dt_setup_initrd_arch(unsigned long start,
}
#endif
/*
* irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
*
* Currently the mapping mechanism is trivial; simple flat hwirq numbers are
* mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not
* supported.
*/
unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
return intspec[0];
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
void __init early_init_devtree(void *params)
{
/* Setup flat device-tree pointer */

12
kernel/irq/irqdomain.c
View File

@ -411,6 +411,18 @@ unsigned int irq_create_of_mapping(struct device_node *controller,
domain = controller ? irq_find_host(controller) : irq_default_domain;
if (!domain) {
#ifdef CONFIG_MIPS
/*
* Workaround to avoid breaking interrupt controller drivers
* that don't yet register an irq_domain. This is temporary
* code. ~~~gcl, Feb 24, 2012
*
* Scheduled for removal in Linux v3.6. That should be enough
* time.
*/
if (intsize > 0)
return intspec[0];
#endif
printk(KERN_WARNING "irq: no irq domain found for %s !\n",
controller->full_name);
return 0;