2 * linux/arch/h8300/kernel/ints.c
4 * Yoshinori Sato <ysato@users.sourceforge.jp>
6 * Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
12 * Copyright 1996 Roman Zippel
13 * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/kernel_stat.h>
21 #include <linux/seq_file.h>
22 #include <linux/interrupt.h>
23 #include <linux/init.h>
24 #include <linux/random.h>
25 #include <linux/bootmem.h>
26 #include <linux/hardirq.h>
28 #include <asm/system.h>
30 #include <asm/traps.h>
32 #include <asm/setup.h>
33 #include <asm/errno.h>
36 * This structure has only 4 elements for speed reasons
38 typedef struct irq_handler {
39 irqreturn_t (*handler)(int, void *, struct pt_regs *);
46 static irq_handler_t *irq_list[NR_IRQS];
47 static int use_kmalloc;
49 extern unsigned long *interrupt_redirect_table;
50 extern const int h8300_saved_vectors[];
51 extern const unsigned long h8300_trap_table[];
52 int h8300_enable_irq_pin(unsigned int irq);
53 void h8300_disable_irq_pin(unsigned int irq);
55 #define CPU_VECTOR ((unsigned long *)0x000000)
56 #define ADDR_MASK (0xffffff)
58 #if defined(CONFIG_RAMKERNEL)
59 static unsigned long __init *get_vector_address(void)
61 unsigned long *rom_vector = CPU_VECTOR;
62 unsigned long base,tmp;
65 base = rom_vector[EXT_IRQ0] & ADDR_MASK;
67 /* check romvector format */
68 for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
69 if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
73 /* ramvector base address */
77 tmp = ~(*(volatile unsigned long *)base);
78 (*(volatile unsigned long *)base) = tmp;
79 if ((*(volatile unsigned long *)base) != tmp)
81 return (unsigned long *)base;
85 void __init init_IRQ(void)
87 #if defined(CONFIG_RAMKERNEL)
89 unsigned long *ramvec,*ramvec_p;
90 const unsigned long *trap_entry;
91 const int *saved_vector;
93 ramvec = get_vector_address();
95 panic("interrupt vector serup failed.");
97 printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
99 /* create redirect table */
101 trap_entry = h8300_trap_table;
102 saved_vector = h8300_saved_vectors;
103 for ( i = 0; i < NR_IRQS; i++) {
104 if (i == *saved_vector) {
108 if ( i < NR_TRAPS ) {
110 *ramvec_p = VECTOR(*trap_entry);
114 *ramvec_p++ = REDIRECT(interrupt_entry);
117 interrupt_redirect_table = ramvec;
120 for (i = 0; i < NR_IRQS; i++) {
122 printk(KERN_DEBUG "\n%p: ",ramvec_p);
123 printk(KERN_DEBUG "%p ",*ramvec_p);
126 printk(KERN_DEBUG "\n");
131 int request_irq(unsigned int irq,
132 irqreturn_t (*handler)(int, void *, struct pt_regs *),
133 unsigned long flags, const char *devname, void *dev_id)
135 irq_handler_t *irq_handle;
136 if (irq < 0 || irq >= NR_IRQS) {
137 printk(KERN_ERR "Incorrect IRQ %d from %s\n", irq, devname);
141 if (irq_list[irq] || (h8300_enable_irq_pin(irq) == -EBUSY))
145 irq_handle = kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
147 /* use bootmem allocater */
148 irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
149 irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
152 if (irq_handle == NULL)
155 irq_handle->handler = handler;
156 irq_handle->flags = flags;
157 irq_handle->count = 0;
158 irq_handle->dev_id = dev_id;
159 irq_handle->devname = devname;
160 irq_list[irq] = irq_handle;
162 if (irq_handle->flags & IRQF_SAMPLE_RANDOM)
163 rand_initialize_irq(irq);
169 EXPORT_SYMBOL(request_irq);
171 void free_irq(unsigned int irq, void *dev_id)
176 if (!irq_list[irq] || irq_list[irq]->dev_id != dev_id)
177 printk(KERN_WARNING "Removing probably wrong IRQ %d from %s\n",
178 irq, irq_list[irq]->devname);
180 h8300_disable_irq_pin(irq);
181 if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
182 kfree(irq_list[irq]);
183 irq_list[irq] = NULL;
187 EXPORT_SYMBOL(free_irq);
190 * Do we need these probe functions on the m68k?
192 unsigned long probe_irq_on (void)
197 EXPORT_SYMBOL(probe_irq_on);
199 int probe_irq_off (unsigned long irqs)
204 EXPORT_SYMBOL(probe_irq_off);
206 void enable_irq(unsigned int irq)
208 if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
209 IER_REGS |= 1 << (irq - EXT_IRQ0);
212 void disable_irq(unsigned int irq)
214 if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
215 IER_REGS &= ~(1 << (irq - EXT_IRQ0));
218 asmlinkage void process_int(int irq, struct pt_regs *fp)
221 h8300_clear_isr(irq);
222 if (irq >= NR_TRAPS && irq < NR_IRQS) {
224 irq_list[irq]->handler(irq, irq_list[irq]->dev_id, fp);
225 irq_list[irq]->count++;
226 if (irq_list[irq]->flags & IRQF_SAMPLE_RANDOM)
227 add_interrupt_randomness(irq);
235 int show_interrupts(struct seq_file *p, void *v)
237 int i = *(loff_t *) v;
239 if ((i < NR_IRQS) && (irq_list[i]!=NULL)) {
240 seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
241 seq_printf(p, "%s\n", irq_list[i]->devname);
247 void init_irq_proc(void)
251 static int __init enable_kmalloc(void)
256 core_initcall(enable_kmalloc);