/*
* linux/arch/m68knommu/platform/68328/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/errno.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/setup.h>
#if defined(CONFIG_M68328)
#include <asm/MC68328.h>
#elif defined(CONFIG_M68EZ328)
#include <asm/MC68EZ328.h>
#elif defined(CONFIG_M68VZ328)
#include <asm/MC68VZ328.h>
#endif
/* assembler routines */
asmlinkage void system_call(void);
asmlinkage void buserr(void);
asmlinkage void trap(void);
asmlinkage void trap3(void);
asmlinkage void trap4(void);
asmlinkage void trap5(void);
asmlinkage void trap6(void);
asmlinkage void trap7(void);
asmlinkage void trap8(void);
asmlinkage void trap9(void);
asmlinkage void trap10(void);
asmlinkage void trap11(void);
asmlinkage void trap12(void);
asmlinkage void trap13(void);
asmlinkage void trap14(void);
asmlinkage void trap15(void);
asmlinkage void trap33(void);
asmlinkage void trap34(void);
asmlinkage void trap35(void);
asmlinkage void trap36(void);
asmlinkage void trap37(void);
asmlinkage void trap38(void);
asmlinkage void trap39(void);
asmlinkage void trap40(void);
asmlinkage void trap41(void);
asmlinkage void trap42(void);
asmlinkage void trap43(void);
asmlinkage void trap44(void);
asmlinkage void trap45(void);
asmlinkage void trap46(void);
asmlinkage void trap47(void);
asmlinkage irqreturn_t bad_interrupt(int, void *, struct pt_regs *);
asmlinkage irqreturn_t inthandler(void);
asmlinkage irqreturn_t inthandler1(void);
asmlinkage irqreturn_t inthandler2(void);
asmlinkage irqreturn_t inthandler3(void);
asmlinkage irqreturn_t inthandler4(void);
asmlinkage irqreturn_t inthandler5(void);
asmlinkage irqreturn_t inthandler6(void);
asmlinkage irqreturn_t inthandler7(void);
extern e_vector *_ramvec;
/* The number of spurious interrupts */
volatile unsigned int num_spurious;
unsigned int local_irq_count[NR_CPUS];
/* irq node variables for the 32 (potential) on chip sources */
static irq_node_t int_irq_list[NR_IRQS];
#if !defined(CONFIG_DRAGEN2)
asm (".global _start, __ramend/n/t"
".section .romvec/n"
"e_vectors:\n\t"
".long __ramend-4, _start, buserr, trap, trap, trap, trap, trap\n\t"
".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
".long trap, trap, trap, trap\n\t"
".long trap, trap, trap, trap\n\t"
/*.long inthandler, inthandler, inthandler, inthandler
.long inthandler4, inthandler, inthandler, inthandler */
/* TRAP #0-15 */
".long system_call, trap, trap, trap, trap, trap, trap, trap\n\t"
".long trap, trap, trap, trap, trap, trap, trap, trap\n\t"
".long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n\t"
".text\n"
"ignore: rte");
#endif
/*
* This function should be called during kernel startup to initialize
* the IRQ handling routines.
*/
void init_IRQ(void)
{
int i;
/* set up the vectors */
for (i = 72; i < 256; ++i)
_ramvec[i] = (e_vector) bad_interrupt;
_ramvec[32] = system_call;
_ramvec[65] = (e_vector) inthandler1;
_ramvec[66] = (e_vector) inthandler2;
_ramvec[67] = (e_vector) inthandler3;
_ramvec[68] = (e_vector) inthandler4;
_ramvec[69] = (e_vector) inthandler5;
_ramvec[70] = (e_vector) inthandler6;
_ramvec[71] = (e_vector) inthandler7;
IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
/* initialize handlers */
for (i = 0; i < NR_IRQS; i++) {
int_irq_list[i].handler = bad_interrupt;
int_irq_list[i].flags = IRQ_FLG_STD;
int_irq_list[i].dev_id = NULL;
int_irq_list[i].devname = NULL;
}
/* turn off all interrupts */
IMR = ~0;
}
int request_irq(
unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags,
const char *devname,
void *dev_id)
{
if (irq >= NR_IRQS) {
printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, int_irq_list[irq].devname);
return -EBUSY;
}
if (flags & IRQ_FLG_REPLACE) {
printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
__FUNCTION__, devname, irq, int_irq_list[irq].devname);
return -EBUSY;
}
}
int_irq_list[irq].handler = handler;
int_irq_list[irq].flags = flags;
int_irq_list[irq].dev_id = dev_id;
int_irq_list[irq].devname = devname;
IMR &= ~(1<<irq);
return 0;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
if (irq >= NR_IRQS) {
printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
return;
}
if (int_irq_list[irq].dev_id != dev_id)
printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, int_irq_list[irq].devname);
int_irq_list[irq].handler = bad_interrupt;
int_irq_list[irq].flags = IRQ_FLG_STD;
int_irq_list[irq].dev_id = NULL;
int_irq_list[irq].devname = NULL;
IMR |= 1<<irq;
}
EXPORT_SYMBOL(free_irq);
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
if (i < NR_IRQS) {
if (int_irq_list[i].devname) {
seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
if (int_irq_list[i].flags & IRQ_FLG_LOCK)
seq_printf(p, "L ");
else
seq_printf(p, " ");
seq_printf(p, "%s\n", int_irq_list[i].devname);
}
}
if (i == NR_IRQS)
seq_printf(p, " : %10u spurious\n", num_spurious);
return 0;
}
/* The 68k family did not have a good way to determine the source
* of interrupts until later in the family. The EC000 core does
* not provide the vector number on the stack, we vector everything
* into one vector and look in the blasted mask register...
* This code is designed to be fast, almost constant time, not clean!
*/
void process_int(int vec, struct pt_regs *fp)
{
int irq;
int mask;
unsigned long pend = ISR;
while (pend) {
if (pend & 0x0000ffff) {
if (pend & 0x000000ff) {
if (pend & 0x0000000f) {
mask = 0x00000001;
irq = 0;
} else {
mask = 0x00000010;
irq = 4;
}
} else {
if (pend & 0x00000f00) {
mask = 0x00000100;
irq = 8;
} else {
mask = 0x00001000;
irq = 12;
}
}
} else {
if (pend & 0x00ff0000) {
if (pend & 0x000f0000) {
mask = 0x00010000;
irq = 16;
} else {
mask = 0x00100000;
irq = 20;
}
} else {
if (pend & 0x0f000000) {
mask = 0x01000000;
irq = 24;
} else {
mask = 0x10000000;
irq = 28;
}
}
}
while (! (mask & pend)) {
mask <<=1;
irq++;
}
kstat_cpu(0).irqs[irq]++;
if (int_irq_list[irq].handler) {
int_irq_list[irq].handler(irq, int_irq_list[irq].dev_id, fp);
} else {
printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the IMR...\n", irq);
IMR |= mask;
}
pend &= ~mask;
}
}
