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