2 * linux/arch/h8300/kernel/irq.c
4 * Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp>
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/seq_file.h>
13 #include <linux/init.h>
14 #include <linux/random.h>
15 #include <linux/bootmem.h>
16 #include <linux/irq.h>
17 #include <linux/interrupt.h>
19 #include <asm/system.h>
20 #include <asm/traps.h>
22 #include <asm/setup.h>
23 #include <asm/errno.h>
27 extern unsigned long *interrupt_redirect_table;
28 extern const int h8300_saved_vectors[];
29 extern const h8300_vector h8300_trap_table[];
30 int h8300_enable_irq_pin(unsigned int irq);
31 void h8300_disable_irq_pin(unsigned int irq);
33 #define CPU_VECTOR ((unsigned long *)0x000000)
34 #define ADDR_MASK (0xffffff)
36 static inline int is_ext_irq(unsigned int irq)
38 return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS));
41 static void h8300_enable_irq(unsigned int irq)
44 IER_REGS |= 1 << (irq - EXT_IRQ0);
47 static void h8300_disable_irq(unsigned int irq)
50 IER_REGS &= ~(1 << (irq - EXT_IRQ0));
53 static void h8300_end_irq(unsigned int irq)
57 static unsigned int h8300_startup_irq(unsigned int irq)
60 return h8300_enable_irq_pin(irq);
65 static void h8300_shutdown_irq(unsigned int irq)
68 h8300_disable_irq_pin(irq);
72 * h8300 interrupt controller implementation
74 struct irq_chip h8300irq_chip = {
76 .startup = h8300_startup_irq,
77 .shutdown = h8300_shutdown_irq,
78 .enable = h8300_enable_irq,
79 .disable = h8300_disable_irq,
84 #if defined(CONFIG_RAMKERNEL)
85 static unsigned long __init *get_vector_address(void)
87 unsigned long *rom_vector = CPU_VECTOR;
88 unsigned long base,tmp;
91 base = rom_vector[EXT_IRQ0] & ADDR_MASK;
93 /* check romvector format */
94 for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
95 if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
99 /* ramvector base address */
102 /* writerble check */
103 tmp = ~(*(volatile unsigned long *)base);
104 (*(volatile unsigned long *)base) = tmp;
105 if ((*(volatile unsigned long *)base) != tmp)
107 return (unsigned long *)base;
110 static void __init setup_vector(void)
113 unsigned long *ramvec,*ramvec_p;
114 const h8300_vector *trap_entry;
115 const int *saved_vector;
117 ramvec = get_vector_address();
119 panic("interrupt vector serup failed.");
121 printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
123 /* create redirect table */
125 trap_entry = h8300_trap_table;
126 saved_vector = h8300_saved_vectors;
127 for ( i = 0; i < NR_IRQS; i++) {
128 if (i == *saved_vector) {
132 if ( i < NR_TRAPS ) {
134 *ramvec_p = VECTOR(*trap_entry);
138 *ramvec_p++ = REDIRECT(interrupt_entry);
141 interrupt_redirect_table = ramvec;
144 for (i = 0; i < NR_IRQS; i++) {
146 printk(KERN_DEBUG "\n%p: ",ramvec_p);
147 printk(KERN_DEBUG "%p ",*ramvec_p);
150 printk(KERN_DEBUG "\n");
154 #define setup_vector() do { } while(0)
157 void __init init_IRQ(void)
163 for (c = 0; c < NR_IRQS; c++) {
164 irq_desc[c].status = IRQ_DISABLED;
165 irq_desc[c].action = NULL;
166 irq_desc[c].depth = 1;
167 irq_desc[c].chip = &h8300irq_chip;
171 asmlinkage void do_IRQ(int irq)
178 #if defined(CONFIG_PROC_FS)
179 int show_interrupts(struct seq_file *p, void *v)
181 int i = *(loff_t *) v;
182 struct irqaction * action;
186 seq_puts(p, " CPU0");
189 spin_lock_irqsave(&irq_desc[i].lock, flags);
190 action = irq_desc[i].action;
193 seq_printf(p, "%3d: ",i);
194 seq_printf(p, "%10u ", kstat_irqs(i));
195 seq_printf(p, " %14s", irq_desc[i].chip->name);
196 seq_printf(p, "-%-8s", irq_desc[i].name);
197 seq_printf(p, " %s", action->name);
199 for (action=action->next; action; action = action->next)
200 seq_printf(p, ", %s", action->name);
203 spin_unlock_irqrestore(&irq_desc[i].lock, flags);