[PATCH] xtensa: fix irq and misc fixes

Update the architecture specific interrupt handling code for Xtensa to support
the new API.  Use generic BUG macros in bug.h, and some minor fixes.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 57 insertions, 59 deletions

diff --git a/arch/xtensa/kernel/irq.c b/arch/xtensa/kernel/irq.c
index 1cf744ee0959..c9ea73b7031b 100644
--- a/arch/xtensa/kernel/irq.c
+++ b/arch/xtensa/kernel/irq.c
@@ -4,7 +4,7 @@
  * Xtensa built-in interrupt controller and some generic functions copied
  * from i386.
  *
- * Copyright (C) 2002 - 2005 Tensilica, Inc.
+ * Copyright (C) 2002 - 2006 Tensilica, Inc.
  * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
  *
  *
@@ -22,11 +22,6 @@
 #include <asm/uaccess.h>
 #include <asm/platform.h>
 
-static void enable_xtensa_irq(unsigned int irq);
-static void disable_xtensa_irq(unsigned int irq);
-static void mask_and_ack_xtensa(unsigned int irq);
-static void end_xtensa_irq(unsigned int irq);
-
 static unsigned int cached_irq_mask;
 
 atomic_t irq_err_count;
@@ -46,8 +41,16 @@ void ack_bad_irq(unsigned int irq)
  * handlers).
  */
 
-unsigned int  do_IRQ(int irq, struct pt_regs *regs)
+asmlinkage void do_IRQ(int irq, struct pt_regs *regs)
 {
+        struct pt_regs *old_regs = set_irq_regs(regs);
+        struct irq_desc *desc = irq_desc + irq;
+
+        if (irq >= NR_IRQS) {
+                printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
+                                __FUNCTION__, irq);
+        }
+
         irq_enter();
 
 #ifdef CONFIG_DEBUG_STACKOVERFLOW
@@ -63,12 +66,10 @@ unsigned int  do_IRQ(int irq, struct pt_regs *regs)
                                sp - sizeof(struct thread_info));
         }
 #endif
-
-        __do_IRQ(irq, regs);
+        desc->handle_irq(irq, desc);
 
         irq_exit();
-
-        return 1;
+        set_irq_regs(old_regs);
 }
 
 /*
@@ -118,72 +119,68 @@ skip:
         }
         return 0;
 }
-/* shutdown is same as "disable" */
-#define shutdown_xtensa_irq disable_xtensa_irq
 
-static unsigned int startup_xtensa_irq(unsigned int irq)
-{
-        enable_xtensa_irq(irq);
-        return 0;               /* never anything pending */
-}
-
-static struct hw_interrupt_type xtensa_irq_type = {
-        "Xtensa-IRQ",
-        startup_xtensa_irq,
-        shutdown_xtensa_irq,
-        enable_xtensa_irq,
-        disable_xtensa_irq,
-        mask_and_ack_xtensa,
-        end_xtensa_irq
-};
-
-static inline void mask_irq(unsigned int irq)
+static void xtensa_irq_mask(unsigned int irq)
 {
         cached_irq_mask &= ~(1 << irq);
         set_sr (cached_irq_mask, INTENABLE);
 }
 
-static inline void unmask_irq(unsigned int irq)
+static void xtensa_irq_unmask(unsigned int irq)
 {
         cached_irq_mask |= 1 << irq;
         set_sr (cached_irq_mask, INTENABLE);
 }
 
-static void disable_xtensa_irq(unsigned int irq)
+static void xtensa_irq_ack(unsigned int irq)
 {
-        unsigned long flags;
-        local_save_flags(flags);
-        mask_irq(irq);
-        local_irq_restore(flags);
+        set_sr(1 << irq, INTCLEAR);
 }
 
-static void enable_xtensa_irq(unsigned int irq)
+static int xtensa_irq_retrigger(unsigned int irq)
 {
-        unsigned long flags;
-        local_save_flags(flags);
-        unmask_irq(irq);
-        local_irq_restore(flags);
-}
-
-static void mask_and_ack_xtensa(unsigned int irq)
-{
-        disable_xtensa_irq(irq);
+        set_sr (1 << irq, INTSET);
+        return 1;
 }
 
-static void end_xtensa_irq(unsigned int irq)
-{
-        enable_xtensa_irq(irq);
-}
 
+static struct irq_chip xtensa_irq_chip = {
+        .name           = "xtensa",
+        .mask           = xtensa_irq_mask,
+        .unmask         = xtensa_irq_unmask,
+        .ack            = xtensa_irq_ack,
+        .retrigger      = xtensa_irq_retrigger,
+};
 
 void __init init_IRQ(void)
 {
-        int i;
+        int index;
 
-        for (i=0; i < XTENSA_NR_IRQS; i++)
-                irq_desc[i].chip = &xtensa_irq_type;
+        for (index = 0; index < XTENSA_NR_IRQS; index++) {
+                int mask = 1 << index;
 
-        cached_irq_mask = 0;
+                if (mask & XCHAL_INTTYPE_MASK_SOFTWARE)
+                        set_irq_chip_and_handler(index, &xtensa_irq_chip,
+                                                 handle_simple_irq);
 
-        platform_init_irq();
+                else if (mask & XCHAL_INTTYPE_MASK_EXTERN_EDGE)
+                        set_irq_chip_and_handler(index, &xtensa_irq_chip,
+                                                 handle_edge_irq);
+
+                else if (mask & XCHAL_INTTYPE_MASK_EXTERN_LEVEL)
+                        set_irq_chip_and_handler(index, &xtensa_irq_chip,
+                                                 handle_level_irq);
+
+                else if (mask & XCHAL_INTTYPE_MASK_TIMER)
+                        set_irq_chip_and_handler(index, &xtensa_irq_chip,
+                                                 handle_edge_irq);
+
+                else    /* XCHAL_INTTYPE_MASK_WRITE_ERROR */
+                        /* XCHAL_INTTYPE_MASK_NMI */
+
+                        set_irq_chip_and_handler(index, &xtensa_irq_chip,
+                                                 handle_level_irq);
+        }
+
+        cached_irq_mask = 0;
 }
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 37347e369987..a350431363a0 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -47,7 +47,7 @@ unsigned long long sched_clock(void)
         return (unsigned long long)jiffies * (1000000000 / HZ);
 }
 
-static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t timer_interrupt(int irq, void *dev_id);
 static struct irqaction timer_irqaction = {
         .handler =      timer_interrupt,
         .flags =        IRQF_DISABLED,
@@ -150,7 +150,7 @@ EXPORT_SYMBOL(do_gettimeofday);
  * The timer interrupt is called HZ times per second.
  */
 
-irqreturn_t timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t timer_interrupt (int irq, void *dev_id)
 {
 
         unsigned long next;
@@ -160,9 +160,9 @@ irqreturn_t timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
 again:
         while ((signed long)(get_ccount() - next) > 0) {
 
-                profile_tick(CPU_PROFILING, regs);
+                profile_tick(CPU_PROFILING);
 #ifndef CONFIG_SMP
-                update_process_times(user_mode(regs));
+                update_process_times(user_mode(get_irq_regs()));
 #endif
 
                 write_seqlock(&xtime_lock);
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index cfe75f528725..e01131fec69e 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -17,6 +17,7 @@
 #include <asm-generic/vmlinux.lds.h>
 
 #define _NOCLANGUAGE
+#undef __ASSEMBLER__
 #include <xtensa/config/core.h>
 #include <xtensa/config/system.h>
 OUTPUT_ARCH(xtensa)