h8300 generic irq

h8300 using generic irq handler patch.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/arch/h8300/kernel/irq.c b/arch/h8300/kernel/irq.c
new file mode 100644
index 00000000000..43d21e93f41
--- /dev/null
+++ b/arch/h8300/kernel/irq.c
@@ -0,0 +1,211 @@
+/*
+ * linux/arch/h8300/kernel/irq.c
+ *
+ * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/random.h>
+#include <linux/bootmem.h>
+#include <linux/irq.h>
+
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/errno.h>
+
+/*#define DEBUG*/
+
+extern unsigned long *interrupt_redirect_table;
+extern const int h8300_saved_vectors[];
+extern const unsigned long h8300_trap_table[];
+int h8300_enable_irq_pin(unsigned int irq);
+void h8300_disable_irq_pin(unsigned int irq);
+
+#define CPU_VECTOR ((unsigned long *)0x000000)
+#define ADDR_MASK (0xffffff)
+
+static inline int is_ext_irq(unsigned int irq)
+{
+	return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS));
+}
+
+static void h8300_enable_irq(unsigned int irq)
+{
+	if (is_ext_irq(irq))
+		IER_REGS |= 1 << (irq - EXT_IRQ0);
+}
+
+static void h8300_disable_irq(unsigned int irq)
+{
+	if (is_ext_irq(irq))
+		IER_REGS &= ~(1 << (irq - EXT_IRQ0));
+}
+
+static void h8300_end_irq(unsigned int irq)
+{
+}
+
+static unsigned int h8300_startup_irq(unsigned int irq)
+{
+	if (is_ext_irq(irq))
+		return h8300_enable_irq_pin(irq);
+	else
+		return 0;
+}
+
+static void h8300_shutdown_irq(unsigned int irq)
+{
+	if (is_ext_irq(irq))
+		h8300_disable_irq_pin(irq);
+}
+
+/*
+ * h8300 interrupt controler implementation
+ */
+struct irq_chip h8300irq_chip = {
+	.name		= "H8300-INTC",
+	.startup	= h8300_startup_irq,
+	.shutdown	= h8300_shutdown_irq,
+	.enable		= h8300_enable_irq,
+	.disable	= h8300_disable_irq,
+	.ack		= NULL,
+	.end		= h8300_end_irq,
+};
+
+void ack_bad_irq(unsigned int irq)
+{
+	printk("unexpected IRQ trap at vector %02x\n", irq);
+}
+
+#if defined(CONFIG_RAMKERNEL)
+static unsigned long __init *get_vector_address(void)
+{
+	unsigned long *rom_vector = CPU_VECTOR;
+	unsigned long base,tmp;
+	int vec_no;
+
+	base = rom_vector[EXT_IRQ0] & ADDR_MASK;
+
+	/* check romvector format */
+	for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
+		if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
+			return NULL;
+	}
+
+	/* ramvector base address */
+	base -= EXT_IRQ0*4;
+
+	/* writerble check */
+	tmp = ~(*(volatile unsigned long *)base);
+	(*(volatile unsigned long *)base) = tmp;
+	if ((*(volatile unsigned long *)base) != tmp)
+		return NULL;
+	return (unsigned long *)base;
+}
+
+static void __init setup_vector(void)
+{
+	int i;
+	unsigned long *ramvec,*ramvec_p;
+	const unsigned long *trap_entry;
+	const int *saved_vector;
+
+	ramvec = get_vector_address();
+	if (ramvec == NULL)
+		panic("interrupt vector serup failed.");
+	else
+		printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
+
+	/* create redirect table */
+	ramvec_p = ramvec;
+	trap_entry = h8300_trap_table;
+	saved_vector = h8300_saved_vectors;
+	for ( i = 0; i < NR_IRQS; i++) {
+		if (i == *saved_vector) {
+			ramvec_p++;
+			saved_vector++;
+		} else {
+			if ( i < NR_TRAPS ) {
+				if (*trap_entry)
+					*ramvec_p = VECTOR(*trap_entry);
+				ramvec_p++;
+				trap_entry++;
+			} else
+				*ramvec_p++ = REDIRECT(interrupt_entry);
+		}
+	}
+	interrupt_redirect_table = ramvec;
+#ifdef DEBUG
+	ramvec_p = ramvec;
+	for (i = 0; i < NR_IRQS; i++) {
+		if ((i % 8) == 0)
+			printk(KERN_DEBUG "\n%p: ",ramvec_p);
+		printk(KERN_DEBUG "%p ",*ramvec_p);
+		ramvec_p++;
+	}
+	printk(KERN_DEBUG "\n");
+#endif
+}
+#else
+#define setup_vector() do { } while(0)
+#endif
+
+void __init init_IRQ(void)
+{
+	int c;
+
+	setup_vector();
+
+	for (c = 0; c < NR_IRQS; c++) {
+		irq_desc[c].status = IRQ_DISABLED;
+		irq_desc[c].action = NULL;
+		irq_desc[c].depth = 1;
+		irq_desc[c].chip = &h8300irq_chip;
+	}
+}
+
+asmlinkage void do_IRQ(int irq)
+{
+	irq_enter();
+	__do_IRQ(irq);
+	irq_exit();
+}
+
+#if defined(CONFIG_PROC_FS)
+int show_interrupts(struct seq_file *p, void *v)
+{
+	int i = *(loff_t *) v, j;
+	struct irqaction * action;
+	unsigned long flags;
+
+	if (i == 0)
+		seq_puts(p, "           CPU0");
+
+	if (i < NR_IRQS) {
+		spin_lock_irqsave(&irq_desc[i].lock, flags);
+		action = irq_desc[i].action;
+		if (!action)
+			goto unlock;
+		seq_printf(p, "%3d: ",i);
+		seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+		seq_printf(p, " %14s", irq_desc[i].chip->name);
+		seq_printf(p, "-%-8s", irq_desc[i].name);
+		seq_printf(p, "  %s", action->name);
+
+		for (action=action->next; action; action = action->next)
+			seq_printf(p, ", %s", action->name);
+		seq_putc(p, '\n');
+unlock:
+		spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+	}
+	return 0;
+}
+#endif