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/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <asm/microblaze_intc.h>
#include <asm/asm.h>
#undef DEBUG_INT
void enable_interrupts(void)
{
MSRSET(0x2);
}
int disable_interrupts(void)
{
unsigned int msr;
MFS(msr, rmsr);
MSRCLR(0x2);
return (msr & 0x2) != 0;
}
static struct irq_action *vecs;
static u32 irq_no;
/* mapping structure to interrupt controller */
microblaze_intc_t *intc;
/* default handler */
static void def_hdlr(void)
{
puts("def_hdlr\n");
}
static void enable_one_interrupt(int irq)
{
int mask;
int offset = 1;
offset <<= irq;
mask = intc->ier;
intc->ier = (mask | offset);
#ifdef DEBUG_INT
printf("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask,
intc->ier);
printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
static void disable_one_interrupt(int irq)
{
int mask;
int offset = 1;
offset <<= irq;
mask = intc->ier;
intc->ier = (mask & ~offset);
#ifdef DEBUG_INT
printf("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
intc->ier);
printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
int install_interrupt_handler(int irq, interrupt_handler_t *hdlr, void *arg)
{
struct irq_action *act;
/* irq out of range */
if ((irq < 0) || (irq > irq_no)) {
puts("IRQ out of range\n");
return -1;
}
act = &vecs[irq];
if (hdlr) { /* enable */
act->handler = hdlr;
act->arg = arg;
act->count = 0;
enable_one_interrupt (irq);
return 0;
}
/* Disable */
act->handler = (interrupt_handler_t *) def_hdlr;
act->arg = (void *)irq;
disable_one_interrupt(irq);
return 1;
}
/* initialization interrupt controller - hardware */
static void intc_init(void)
{
intc->mer = 0;
intc->ier = 0;
intc->iar = 0xFFFFFFFF;
/* XIntc_Start - hw_interrupt enable and all interrupt enable */
intc->mer = 0x3;
#ifdef DEBUG_INT
printf("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
int interrupts_init(void)
{
int i;
#if defined(CONFIG_SYS_INTC_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
intc = (microblaze_intc_t *) (CONFIG_SYS_INTC_0_ADDR);
irq_no = CONFIG_SYS_INTC_0_NUM;
#endif
if (irq_no) {
vecs = calloc(1, sizeof(struct irq_action) * irq_no);
if (vecs == NULL) {
puts("Interrupt vector allocation failed\n");
return -1;
}
/* initialize irq list */
for (i = 0; i < irq_no; i++) {
vecs[i].handler = (interrupt_handler_t *) def_hdlr;
vecs[i].arg = (void *)i;
vecs[i].count = 0;
}
/* initialize intc controller */
intc_init();
enable_interrupts();
} else {
puts("Undefined interrupt controller\n");
}
return 0;
}
void interrupt_handler(void)
{
int irqs = intc->ivr; /* find active interrupt */
int mask = 1;
#ifdef DEBUG_INT
int value;
printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
R14(value);
printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
#endif
struct irq_action *act = vecs + irqs;
#ifdef DEBUG_INT
printf
("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
act->handler, act->count, act->arg);
#endif
act->handler (act->arg);
act->count++;
intc->iar = mask << irqs;
#ifdef DEBUG_INT
printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
intc->ier, intc->iar, intc->mer);
R14(value);
printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
#endif
}
#if defined(CONFIG_CMD_IRQ)
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, const char *argv[])
{
int i;
struct irq_action *act = vecs;
if (irq_no) {
puts("\nInterrupt-Information:\n\n"
"Nr Routine Arg Count\n"
"-----------------------------\n");
for (i = 0; i < irq_no; i++) {
if (act->handler != (interrupt_handler_t *) def_hdlr) {
printf("%02d %08x %08x %d\n", i,
(int)act->handler, (int)act->arg,
act->count);
}
act++;
}
puts("\n");
} else {
puts("Undefined interrupt controller\n");
}
return 0;
}
#endif
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