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From a729672f117df3602b6d3171d8ab7a84bf53b053 Mon Sep 17 00:00:00 2001
From: Daniel Hellstrom <daniel@gaisler.com>
Date: Thu, 16 Sep 2010 11:12:41 +0200
Subject: [PATCH] SPARC/LEON: added support for Extended IRQ controller, partial patches are already in git tree.
Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
---
arch/sparc/include/asm/irq_32.h | 4 ++++
arch/sparc/kernel/irq_32.c | 32 ++++++++++++++++++++++++++------
arch/sparc/kernel/leon_kernel.c | 8 +++++++-
3 files changed, 37 insertions(+), 7 deletions(-)
--- a/arch/sparc/include/asm/irq_32.h
+++ b/arch/sparc/include/asm/irq_32.h
@@ -6,7 +6,11 @@
#ifndef _SPARC_IRQ_H
#define _SPARC_IRQ_H
+#ifdef CONFIG_SPARC_LEON
+#define NR_IRQS 32
+#else
#define NR_IRQS 16
+#endif
#include <linux/interrupt.h>
--- a/arch/sparc/kernel/irq_32.c
+++ b/arch/sparc/kernel/irq_32.c
@@ -110,6 +110,11 @@ EXPORT_SYMBOL(__raw_local_irq_save);
EXPORT_SYMBOL(raw_local_irq_enable);
EXPORT_SYMBOL(raw_local_irq_restore);
+#ifdef CONFIG_SPARC_LEON
+extern unsigned int sparc_leon_eirq;
+extern int sparc_leon_eirq_get(int eirq, int cpu);
+#endif
+
/*
* Dave Redman (djhr@tadpole.co.uk)
*
@@ -222,10 +227,11 @@ void free_irq(unsigned int irq, void *de
return;
}
cpu_irq = irq & (NR_IRQS - 1);
- if (cpu_irq > 14) { /* 14 irq levels on the sparc */
- printk("Trying to free bogus IRQ %d\n", irq);
- return;
- }
+ /* 14 irq levels on the sparc, however some LEON systems have 31 IRQs */
+ if ((cpu_irq == 15) || (cpu_irq >= NR_IRQS)) {
+ printk("Trying to free bogus IRQ %d\n", irq);
+ return;
+ }
spin_lock_irqsave(&irq_action_lock, flags);
@@ -303,7 +309,14 @@ void unexpected_irq(int irq, void *dev_i
int i;
struct irqaction * action;
unsigned int cpu_irq;
-
+
+#ifdef CONFIG_SPARC_LEON
+ /* LEON Extended IRQ requires one extra IRQ Number fetch stage */
+ if ( sparc_leon_eirq == irq ) {
+ irq = sparc_leon_eirq_get(irq, smp_processor_id());
+ }
+#endif
+
cpu_irq = irq & (NR_IRQS - 1);
action = sparc_irq[cpu_irq].action;
@@ -330,6 +343,13 @@ void handler_irq(int irq, struct pt_regs
extern void smp4m_irq_rotate(int cpu);
#endif
+#ifdef CONFIG_SPARC_LEON
+ /* LEON Extended IRQ requires one extra IRQ Number fetch stage */
+ if ( sparc_leon_eirq == irq ) {
+ irq = sparc_leon_eirq_get(irq, cpu);
+ }
+#endif
+
old_regs = set_irq_regs(regs);
irq_enter();
disable_pil_irq(irq);
@@ -526,7 +546,7 @@ int request_irq(unsigned int irq,
return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
}
cpu_irq = irq & (NR_IRQS - 1);
- if(cpu_irq > 14) {
+ if(cpu_irq == 15) {
ret = -EINVAL;
goto out;
}
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -104,7 +104,7 @@ static void leon_disable_irq(unsigned in
void __init leon_init_timers(irq_handler_t counter_fn)
{
- int irq;
+ int irq, eirq;
struct device_node *rootnp, *np;
struct property *pp;
int len;
@@ -153,6 +153,12 @@ void __init leon_init_timers(irq_handler
LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
# endif
+ LEON3_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mask[0]), 0);
+ eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus) >> 16) & 0xf;
+ if ( eirq != 0 ) {
+ /* Extended IRQ controller available */
+ sparc_leon_eirq_register(eirq);
+ }
} else {
printk(KERN_ERR "No Timer/irqctrl found\n");
BUG();
|
