4 files changed, 18 insertions, 133 deletions
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index e71d712afb79..88e83368bbf5 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -22,6 +22,7 @@ config OPENRISC
 	select GENERIC_STRNLEN_USER
 	select MODULES_USE_ELF_RELA
 	select HAVE_DEBUG_STACKOVERFLOW
+	select OR1K_PIC
 
 config MMU
 	def_bool y
diff --git a/arch/openrisc/include/asm/irq.h b/arch/openrisc/include/asm/irq.h
index eb612b1865d2..b84634cc95eb 100644
--- a/arch/openrisc/include/asm/irq.h
+++ b/arch/openrisc/include/asm/irq.h
@@ -24,4 +24,7 @@
 
 #define NO_IRQ		(-1)
 
+void handle_IRQ(unsigned int, struct pt_regs *);
+extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
+
 #endif /* __ASM_OPENRISC_IRQ_H__ */
diff --git a/arch/openrisc/include/asm/processor.h b/arch/openrisc/include/asm/processor.h
index cab746fa9e87..4d235e3d2534 100644
--- a/arch/openrisc/include/asm/processor.h
+++ b/arch/openrisc/include/asm/processor.h
@@ -101,6 +101,7 @@ extern unsigned long thread_saved_pc(struct task_struct *t);
 #define init_stack      (init_thread_union.stack)
 
 #define cpu_relax()     barrier()
+#define cpu_relax_lowlatency() cpu_relax()
 
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_OPENRISC_PROCESSOR_H */
diff --git a/arch/openrisc/kernel/irq.c b/arch/openrisc/kernel/irq.c
index 8ec77bc9f1e7..967eb1430203 100644
--- a/arch/openrisc/kernel/irq.c
+++ b/arch/openrisc/kernel/irq.c
@@ -16,11 +16,10 @@
 
 #include <linux/interrupt.h>
 #include <linux/init.h>
-#include <linux/of.h>
 #include <linux/ftrace.h>
 #include <linux/irq.h>
+#include <linux/irqchip.h>
 #include <linux/export.h>
-#include <linux/irqdomain.h>
 #include <linux/irqflags.h>
 
 /* read interrupt enabled status */
@@ -37,150 +36,31 @@ void arch_local_irq_restore(unsigned long flags)
 }
 EXPORT_SYMBOL(arch_local_irq_restore);
 
-
-/* OR1K PIC implementation */
-
-/* We're a couple of cycles faster than the generic implementations with
- * these 'fast' versions.
- */
-
-static void or1k_pic_mask(struct irq_data *data)
-{
-	mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
-}
-
-static void or1k_pic_unmask(struct irq_data *data)
-{
-	mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (1UL << data->hwirq));
-}
-
-static void or1k_pic_ack(struct irq_data *data)
-{
-	/* EDGE-triggered interrupts need to be ack'ed in order to clear
-	 * the latch.
-	 * LEVEL-triggered interrupts do not need to be ack'ed; however,
-	 * ack'ing the interrupt has no ill-effect and is quicker than
-	 * trying to figure out what type it is...
-	 */
-
-	/* The OpenRISC 1000 spec says to write a 1 to the bit to ack the
-	 * interrupt, but the OR1200 does this backwards and requires a 0
-	 * to be written...
-	 */
-
-#ifdef CONFIG_OR1K_1200
-	/* There are two oddities with the OR1200 PIC implementation:
-	 * i)  LEVEL-triggered interrupts are latched and need to be cleared
-	 * ii) the interrupt latch is cleared by writing a 0 to the bit,
-	 *     as opposed to a 1 as mandated by the spec
-	 */
-
-	mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
-#else
-	WARN(1, "Interrupt handling possibly broken\n");
-	mtspr(SPR_PICSR, (1UL << data->hwirq));
-#endif
-}
-
-static void or1k_pic_mask_ack(struct irq_data *data)
-{
-	/* Comments for pic_ack apply here, too */
-
-#ifdef CONFIG_OR1K_1200
-	mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1UL << data->hwirq));
-	mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1UL << data->hwirq));
-#else
-	WARN(1, "Interrupt handling possibly broken\n");
-	mtspr(SPR_PICMR, (1UL << data->hwirq));
-	mtspr(SPR_PICSR, (1UL << data->hwirq));
-#endif
-}
-
-#if 0
-static int or1k_pic_set_type(struct irq_data *data, unsigned int flow_type)
-{
-	/* There's nothing to do in the PIC configuration when changing
-	 * flow type.  Level and edge-triggered interrupts are both
-	 * supported, but it's PIC-implementation specific which type
-	 * is handled. */
-
-	return irq_setup_alt_chip(data, flow_type);
-}
-#endif
-
-static struct irq_chip or1k_dev = {
-	.name = "or1k-PIC",
-	.irq_unmask = or1k_pic_unmask,
-	.irq_mask = or1k_pic_mask,
-	.irq_ack = or1k_pic_ack,
-	.irq_mask_ack = or1k_pic_mask_ack,
-};
-
-static struct irq_domain *root_domain;
-
-static inline int pic_get_irq(int first)
-{
-	int hwirq;
-
-	hwirq = ffs(mfspr(SPR_PICSR) >> first);
-	if (!hwirq)
-		return NO_IRQ;
-	else
-		hwirq = hwirq + first -1;
-
-	return irq_find_mapping(root_domain, hwirq);
-}
-
-
-static int or1k_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+void __init init_IRQ(void)
 {
-	irq_set_chip_and_handler_name(irq, &or1k_dev,
-				      handle_level_irq, "level");
-	irq_set_status_flags(irq, IRQ_LEVEL | IRQ_NOPROBE);
-
-	return 0;
+	irqchip_init();
 }
 
-static const struct irq_domain_ops or1k_irq_domain_ops = {
-	.xlate = irq_domain_xlate_onecell,
-	.map = or1k_map,
-};
-
-/*
- * This sets up the IRQ domain for the PIC built in to the OpenRISC
- * 1000 CPU.  This is the "root" domain as these are the interrupts
- * that directly trigger an exception in the CPU.
- */
-static void __init or1k_irq_init(void)
-{
-	struct device_node *intc = NULL;
-
-	/* The interrupt controller device node is mandatory */
-	intc = of_find_compatible_node(NULL, NULL, "opencores,or1k-pic");
-	BUG_ON(!intc);
-
-	/* Disable all interrupts until explicitly requested */
-	mtspr(SPR_PICMR, (0UL));
-
-	root_domain = irq_domain_add_linear(intc, 32,
-					    &or1k_irq_domain_ops, NULL);
-}
+static void (*handle_arch_irq)(struct pt_regs *);
 
-void __init init_IRQ(void)
+void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
 {
-	or1k_irq_init();
+	handle_arch_irq = handle_irq;
 }
 
-void __irq_entry do_IRQ(struct pt_regs *regs)
+void handle_IRQ(unsigned int irq, struct pt_regs *regs)
 {
-	int irq = -1;
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
 	irq_enter();
 
-	while ((irq = pic_get_irq(irq + 1)) != NO_IRQ)
-		generic_handle_irq(irq);
+	generic_handle_irq(irq);
 
 	irq_exit();
 	set_irq_regs(old_regs);
 }
+
+void __irq_entry do_IRQ(struct pt_regs *regs)
+{
+	handle_arch_irq(regs);
+}