/*
* 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.
*
* Copyright (c) 2004 MIPS Inc
* Author: chris@mips.com
*
* Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/msc01_ic.h>
#include <asm/traps.h>
static unsigned long _icctrl_msc;
#define MSC01_IC_REG_BASE _icctrl_msc
#define MSCIC_WRITE(reg, data) do { *(volatile u32 *)(reg) = data; } while (0)
#define MSCIC_READ(reg, data) do { data = *(volatile u32 *)(reg); } while (0)
static unsigned int irq_base;
/* mask off an interrupt */
static inline void mask_msc_irq(unsigned int irq)
{
if (irq < (irq_base + 32))
MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
else
MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
}
/* unmask an interrupt */
static inline void unmask_msc_irq(unsigned int irq)
{
if (irq < (irq_base + 32))
MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
else
MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
}
/*
* Masks and ACKs an IRQ
*/
static void level_mask_and_ack_msc_irq(unsigned int irq)
{
mask_msc_irq(irq);
if (!cpu_has_veic)
MSCIC_WRITE(MSC01_IC_EOI, 0);
/* This actually needs to be a call into platform code */
smtc_im_ack_irq(irq);
}
/*
* Masks and ACKs an IRQ
*/
static void edge_mask_and_ack_msc_irq(unsigned int irq)
{
mask_msc_irq(irq);
if (!cpu_has_veic)
MSCIC_WRITE(MSC01_IC_EOI, 0);
else {
u32 r;
MSCIC_READ(MSC01_IC_SUP+irq*8, r);
MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
}
smtc_im_ack_irq(irq);
}
/*
* End IRQ processing
*/
static void end_msc_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
unmask_msc_irq(irq);
}
/*
* Interrupt handler for interrupts coming from SOC-it.
*/
void ll_msc_irq(void)
{
unsigned int irq;
/* read the interrupt vector register */
MSCIC_READ(MSC01_IC_VEC, irq);
if (irq < 64)
do_IRQ(irq + irq_base);
else {
/* Ignore spurious interrupt */
}
}
static void msc_bind_eic_interrupt(int irq, int set)
{
MSCIC_WRITE(MSC01_IC_RAMW,
(irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
}
static struct irq_chip msc_levelirq_type = {
.name = "SOC-it-Level",
.ack = level_mask_and_ack_msc_irq,
.mask = mask_msc_irq,
.mask_ack = level_mask_and_ack_msc_irq,
.unmask = unmask_msc_irq,
.eoi = unmask_msc_irq,
.end = end_msc_irq,
};
static struct irq_chip msc_edgeirq_type = {
.name = "SOC-it-Edge",
.ack = edge_mask_and_ack_msc_irq,
.mask = mask_msc_irq,
.mask_ack = edge_mask_and_ack_msc_irq,
.unmask = unmask_msc_irq,
.eoi = unmask_msc_irq,
.end = end_msc_irq,
};
void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
{
_icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
/* Reset interrupt controller - initialises all registers to 0 */
MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
board_bind_eic_interrupt = &msc_bind_eic_interrupt;
for (; nirq >= 0; nirq--, imp++) {
int n = imp->im_irq;
switch (imp->im_type) {
case MSC01_IRQ_EDGE:
set_irq_chip(irqbase+n, &msc_edgeirq_type);
if (cpu_has_veic)
MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
else
MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
break;
case MSC01_IRQ_LEVEL:
set_irq_chip(irqbase+n, &msc_levelirq_type);
if (cpu_has_veic)
MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
else
MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
}
}
irq_base = irqbase;
MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT); /* Enable interrupt generation */
}
