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-rw-r--r--target/linux/leon/patches-2.6.36/004-extended_irq_controller.patch119
1 files changed, 119 insertions, 0 deletions
diff --git a/target/linux/leon/patches-2.6.36/004-extended_irq_controller.patch b/target/linux/leon/patches-2.6.36/004-extended_irq_controller.patch
new file mode 100644
index 0000000000..b660b648b8
--- /dev/null
+++ b/target/linux/leon/patches-2.6.36/004-extended_irq_controller.patch
@@ -0,0 +1,119 @@
+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();