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/*
* Code to handle irqs on Orion boards
* -- Cort <cort@fsmlabs.com>
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/malloc.h>
#include <linux/random.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/orion.h>
void (*board_time_init)(struct irqaction *irq);
extern asmlinkage void orionIRQ(void);
unsigned long spurious_count = 0;
irq_desc_t irq_desc[NR_IRQS];
static void galileo_ack(unsigned int irq_nr)
{
*((unsigned long *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC18) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
}
struct hw_interrupt_type galileo_pic = {
" Galileo ",
NULL,
NULL,
NULL, /* unmask_irq */
NULL, /* mask_irq */
galileo_ack, /* mask_and_ack */
0
};
/* Function for careful CP0 interrupt mask access */
static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
{
unsigned long status = read_32bit_cp0_register(CP0_STATUS);
status &= ~((clr_mask & 0xFF) << 8);
status |= (set_mask & 0xFF) << 8;
write_32bit_cp0_register(CP0_STATUS, status);
}
static inline void mask_irq(unsigned int irq_nr)
{
modify_cp0_intmask(irq_nr, 0);
}
static inline void unmask_irq(unsigned int irq_nr)
{
modify_cp0_intmask(0, irq_nr);
}
void disable_irq(unsigned int irq_nr)
{
unsigned long flags;
save_and_cli(flags);
mask_irq(irq_nr);
restore_flags(flags);
}
void enable_irq(unsigned int irq_nr)
{
unsigned long flags;
save_and_cli(flags);
unmask_irq(irq_nr);
restore_flags(flags);
}
/*static struct irqaction *irq_action[NR_IRQS] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
*/
void __init orion_time_init(struct irqaction *irq)
{
__u32 timer_count;
irq_desc[2].handler = &galileo_pic;
irq_desc[2].action = irq;
/* This code was provided by the CoSine guys and despite its
* appearance init's the timer.
* -- Cort
*/
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x864) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x850) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
timer_count = 300000000/100;
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x850) ) = (((( timer_count )&0xff)<<24)+ ((( timer_count )&0xff00)<<8)+ ((( timer_count )&0xff0000)>>8)+ ((( timer_count )&0xff000000)>>24)) ;
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC1C) ) = (((( 0x100 )&0xff)<<24)+ ((( 0x100 )&0xff00)<<8)+ ((( 0x100 )&0xff0000)>>8)+ ((( 0x100 )&0xff000000)>>24)) ;
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x864) ) = (((( 0x03 )&0xff)<<24)+ ((( 0x03 )&0xff00)<<8)+ ((( 0x03 )&0xff0000)>>8)+ ((( 0x03 )&0xff000000)>>24)) ;
*((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC18) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
}
int get_irq_list(char *buf)
{
int i, len = 0, j;
struct irqaction * action;
len += sprintf(buf+len, " ");
for (j=0; j<smp_num_cpus; j++)
len += sprintf(buf+len, "CPU%d ",j);
*(char *)(buf+len++) = '\n';
for (i = 0 ; i < NR_IRQS ; i++) {
action = irq_desc[i].action;
if ( !action || !action->handler )
continue;
len += sprintf(buf+len, "%3d: ", i);
len += sprintf(buf+len, "%10u ", kstat_irqs(i));
if ( irq_desc[i].handler )
len += sprintf(buf+len, " %s ", irq_desc[i].handler->typename );
else
len += sprintf(buf+len, " None ");
len += sprintf(buf+len, " %s",action->name);
for (action=action->next; action; action = action->next) {
len += sprintf(buf+len, ", %s", action->name);
}
len += sprintf(buf+len, "\n");
}
len += sprintf(buf+len, "BAD: %10lu\n", spurious_count);
return len;
}
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
struct irqaction *action;
int do_random, cpu;
int status;
cpu = smp_processor_id();
irq_enter(cpu);
kstat.irqs[cpu][irq]++;
status = 0;
if (irq_desc[irq].handler->ack)
irq_desc[irq].handler->ack(irq);
action = irq_desc[irq].action;
if (action && action->handler)
{
if (!(action->flags & SA_INTERRUPT))
__sti();
do {
status |= action->flags;
action->handler(irq, action->dev_id, regs);
action = action->next;
} while ( action );
__cli();
if (irq_desc[irq].handler)
{
if (irq_desc[irq].handler->end)
irq_desc[irq].handler->end(irq);
else if (irq_desc[irq].handler->enable)
irq_desc[irq].handler->enable(irq);
}
}
irq_exit(cpu);
if (softirq_active(cpu)&softirq_mask(cpu))
do_softirq();
/* unmasking and bottom half handling is done magically for us. */
}
int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char * devname, void *dev_id)
{
struct irqaction *old, **p, *action;
unsigned long flags;
if (irq >= NR_IRQS)
return -EINVAL;
if (!handler)
{
/* Free */
for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next)
{
/* Found it - now free it */
save_flags(flags);
cli();
*p = action->next;
restore_flags(flags);
kfree(action);
return 0;
}
return -ENOENT;
}
action = (struct irqaction *)
kmalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!action)
return -ENOMEM;
save_flags(flags);
cli();
action->handler = handler;
action->flags = irqflags;
action->mask = 0;
action->name = devname;
action->dev_id = dev_id;
action->next = NULL;
enable_irq(irq);
p = &irq_desc[irq].action;
if ((old = *p) != NULL) {
/* Can't share interrupts unless both agree to */
if (!(old->flags & action->flags & SA_SHIRQ))
return -EBUSY;
/* add new interrupt at end of irq queue */
do {
p = &old->next;
old = *p;
} while (old);
}
*p = action;
restore_flags(flags);
return 0;
}
void free_irq(unsigned int irq, void *dev_id)
{
request_irq(irq, NULL, 0, NULL, dev_id);
}
unsigned long probe_irq_on (void)
{
return 0;
}
int probe_irq_off (unsigned long irqs)
{
return 0;
}
int (*irq_cannonicalize)(int irq);
int orion_irq_cannonicalize(int i)
{
return i;
}
void __init init_IRQ(void)
{
irq_cannonicalize = orion_irq_cannonicalize;
set_except_vector(0, orionIRQ);
}
EXPORT_SYMBOL(irq_cannonicalize);
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