[RFC PATCHv1 1/2] ARM: socfpga: initial support for Altera's SOCFPGA platform.
Pavel Machek
pavel at denx.de
Sun Jul 1 14:41:10 EDT 2012
On Sat 2012-06-30 21:04:37, Arnd Bergmann wrote:
> On Wednesday 27 June 2012, Thomas Petazzoni wrote:
> > > > > +#define NR_IRQS 512
> > > >
> > > > You should be looking at using SPARSE_IRQ to avoid having a maximum
> > > > number of irqs. See for example mach-highbank/.
> > >
> > > Is maximum number of interrupts a problem? 512 does not seem
> > > excessive.
> >
> > Regardless of the value of NR_IRQS, there is apparently a trend to use
> > SPARSE_IRQ anyway. However, I am not at the best place to explain why
> > SPARSE_IRQ is now considered the right thing to use.
>
> The main reason for me is to get rid of a hardcoded NR_IRQS constant,
> whihc is a blocker for multiplatform kernels. New platforms should
> do all they can to allow being built together with other platforms
> in the same kernel. While we're not there yet, doing sparse irq
> is an important step in the right direction and should not be hard
> to do for new code.
Something as easy as this? But it does not seem to boot here :-(.
Pavel
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b1578e1..d203253 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -263,6 +263,7 @@ config ARCH_SOCFPGA
select GPIO_PL061 if GPIOLIB
select NEED_MACH_MEMORY_H
select USE_OF
+ select SPARSE_IRQ
help
This enables support for Altera SOCFPGA Cyclone V platform
diff --git a/arch/arm/mach-socfpga/include/mach/irqs.h b/arch/arm/mach-socfpga/include/mach/irqs.h
index da50124..565ca59 100644
--- a/arch/arm/mach-socfpga/include/mach/irqs.h
+++ b/arch/arm/mach-socfpga/include/mach/irqs.h
@@ -27,8 +27,6 @@
#define IRQ_SOCFPGA_CLK_MAN (IRQ_SOCFPGA_GIC_START + 173) /* Clock manager */
-#define NR_IRQS 512
-
#define MAX_GIC_NR 1
#endif /* __MACH_IRQS_H */
diff --git a/arch/arm/mach-socfpga/socfpga_cyclone5.c b/arch/arm/mach-socfpga/socfpga_cyclone5.c
index f6498cc..674bac3 100644
--- a/arch/arm/mach-socfpga/socfpga_cyclone5.c
+++ b/arch/arm/mach-socfpga/socfpga_cyclone5.c
@@ -24,6 +24,7 @@
#include <mach/socfpga-timer.h>
#include <mach/dw_apb_timer.h>
#include <mach/socfpga_cyclone5.h>
+#include <mach/irqs.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@@ -133,6 +134,11 @@ static void socfpga_cyclone5_restart(char mode, const char *cmd)
static void __init socfpga_cyclone5_init(void)
{
+ int i;
+ for (i = 0; i < 512; i++) {
+ dynamic_irq_init(i);
+ }
+
#ifdef CONFIG_CACHE_L2X0
/* 8-way, 64K/way, evmon/parity/share */
l2x0_of_init(0x00760000, 0xfe000fff);
--
(english) http://www.livejournal.com/~pavelmachek
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