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/*
* linux/arch/h8300/kernel/ints.c
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Copyright 1996 Roman Zippel
* Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
*/
#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/hardirq.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/errno.h>
/*
* This structure has only 4 elements for speed reasons
*/
typedef struct irq_handler {
irqreturn_t (*handler)(int, void *, struct pt_regs *);
int flags;
int count;
void *dev_id;
const char *devname;
} irq_handler_t;
static irq_handler_t *irq_list[NR_IRQS];
static int use_kmalloc;
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)
#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;
}
#endif
void __init init_IRQ(void)
{
#if defined(CONFIG_RAMKERNEL)
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 DUMP_VECTOR
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
#endif
}
int request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
irq_handler_t *irq_handle;
if (irq < 0 || irq >= NR_IRQS) {
printk(KERN_ERR "Incorrect IRQ %d from %s\n", irq, devname);
return -EINVAL;
}
if (irq_list[irq] || (h8300_enable_irq_pin(irq) == -EBUSY))
return -EBUSY;
if (use_kmalloc)
irq_handle = kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
else {
/* use bootmem allocater */
irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
}
if (irq_handle == NULL)
return -ENOMEM;
irq_handle->handler = handler;
irq_handle->flags = flags;
irq_handle->count = 0;
irq_handle->dev_id = dev_id;
irq_handle->devname = devname;
irq_list[irq] = irq_handle;
if (irq_handle->flags & IRQF_SAMPLE_RANDOM)
rand_initialize_irq(irq);
enable_irq(irq);
return 0;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
if (irq >= NR_IRQS)
return;
if (!irq_list[irq] || irq_list[irq]->dev_id != dev_id)
printk(KERN_WARNING "Removing probably wrong IRQ %d from %s\n",
irq, irq_list[irq]->devname);
disable_irq(irq);
h8300_disable_irq_pin(irq);
if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
kfree(irq_list[irq]);
irq_list[irq] = NULL;
}
}
EXPORT_SYMBOL(free_irq);
/*
* Do we need these probe functions on the m68k?
*/
unsigned long probe_irq_on (void)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_on);
int probe_irq_off (unsigned long irqs)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_off);
void enable_irq(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
IER_REGS |= 1 << (irq - EXT_IRQ0);
}
void disable_irq(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
IER_REGS &= ~(1 << (irq - EXT_IRQ0));
}
asmlinkage void process_int(int irq, struct pt_regs *fp)
{
irq_enter();
h8300_clear_isr(irq);
if (irq >= NR_TRAPS && irq < NR_IRQS) {
if (irq_list[irq]) {
irq_list[irq]->handler(irq, irq_list[irq]->dev_id, fp);
irq_list[irq]->count++;
if (irq_list[irq]->flags & IRQF_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
}
} else {
BUG();
}
irq_exit();
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
if ((i < NR_IRQS) && (irq_list[i]!=NULL)) {
seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
seq_printf(p, "%s\n", irq_list[i]->devname);
}
return 0;
}
void init_irq_proc(void)
{
}
static int __init enable_kmalloc(void)
{
use_kmalloc = 1;
return 0;
}
core_initcall(enable_kmalloc);
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