166 lines
3.6 KiB
C
166 lines
3.6 KiB
C
/*
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* linux/arch/h8300/kernel/irq.c
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*
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* Copyright 2007 Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <linux/bootmem.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <asm/traps.h>
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#include <asm/io.h>
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#include <asm/setup.h>
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#include <asm/errno.h>
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/*#define DEBUG*/
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extern unsigned long *interrupt_redirect_table;
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extern const int h8300_saved_vectors[];
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extern const h8300_vector h8300_trap_table[];
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int h8300_enable_irq_pin(unsigned int irq);
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void h8300_disable_irq_pin(unsigned int irq);
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#define CPU_VECTOR ((unsigned long *)0x000000)
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#define ADDR_MASK (0xffffff)
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static inline int is_ext_irq(unsigned int irq)
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{
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return (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS));
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}
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static void h8300_enable_irq(struct irq_data *data)
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{
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if (is_ext_irq(data->irq))
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IER_REGS |= 1 << (data->irq - EXT_IRQ0);
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}
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static void h8300_disable_irq(struct irq_data *data)
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{
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if (is_ext_irq(data->irq))
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IER_REGS &= ~(1 << (data->irq - EXT_IRQ0));
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}
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static unsigned int h8300_startup_irq(struct irq_data *data)
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{
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if (is_ext_irq(data->irq))
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return h8300_enable_irq_pin(data->irq);
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else
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return 0;
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}
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static void h8300_shutdown_irq(struct irq_data *data)
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{
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if (is_ext_irq(data->irq))
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h8300_disable_irq_pin(data->irq);
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}
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/*
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* h8300 interrupt controller implementation
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*/
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struct irq_chip h8300irq_chip = {
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.name = "H8300-INTC",
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.irq_startup = h8300_startup_irq,
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.irq_shutdown = h8300_shutdown_irq,
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.irq_enable = h8300_enable_irq,
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.irq_disable = h8300_disable_irq,
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};
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#if defined(CONFIG_RAMKERNEL)
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static unsigned long __init *get_vector_address(void)
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{
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unsigned long *rom_vector = CPU_VECTOR;
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unsigned long base,tmp;
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int vec_no;
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base = rom_vector[EXT_IRQ0] & ADDR_MASK;
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/* check romvector format */
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for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
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if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
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return NULL;
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}
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/* ramvector base address */
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base -= EXT_IRQ0*4;
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/* writerble check */
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tmp = ~(*(volatile unsigned long *)base);
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(*(volatile unsigned long *)base) = tmp;
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if ((*(volatile unsigned long *)base) != tmp)
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return NULL;
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return (unsigned long *)base;
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}
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static void __init setup_vector(void)
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{
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int i;
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unsigned long *ramvec,*ramvec_p;
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const h8300_vector *trap_entry;
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const int *saved_vector;
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ramvec = get_vector_address();
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if (ramvec == NULL)
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panic("interrupt vector serup failed.");
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else
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printk(KERN_INFO "virtual vector at 0x%08lx\n",(unsigned long)ramvec);
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/* create redirect table */
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ramvec_p = ramvec;
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trap_entry = h8300_trap_table;
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saved_vector = h8300_saved_vectors;
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for ( i = 0; i < NR_IRQS; i++) {
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if (i == *saved_vector) {
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ramvec_p++;
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saved_vector++;
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} else {
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if ( i < NR_TRAPS ) {
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if (*trap_entry)
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*ramvec_p = VECTOR(*trap_entry);
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ramvec_p++;
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trap_entry++;
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} else
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*ramvec_p++ = REDIRECT(interrupt_entry);
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}
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}
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interrupt_redirect_table = ramvec;
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#ifdef DEBUG
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ramvec_p = ramvec;
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for (i = 0; i < NR_IRQS; i++) {
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if ((i % 8) == 0)
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printk(KERN_DEBUG "\n%p: ",ramvec_p);
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printk(KERN_DEBUG "%p ",*ramvec_p);
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ramvec_p++;
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}
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printk(KERN_DEBUG "\n");
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#endif
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}
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#else
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#define setup_vector() do { } while(0)
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#endif
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void __init init_IRQ(void)
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{
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int c;
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setup_vector();
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for (c = 0; c < NR_IRQS; c++)
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irq_set_chip_and_handler(c, &h8300irq_chip, handle_simple_irq);
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}
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asmlinkage void do_IRQ(int irq)
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{
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irq_enter();
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generic_handle_irq(irq);
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irq_exit();
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}
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