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/*
* Copyright 2002 Momentum Computer
* Author: mdharm@momenco.com
* Copyright (C) 2004 Ralf Baechle <ralf@linux-mips.org>
*
* 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.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/mv643xx.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/marvell.h>
static unsigned int irq_base;
static inline int ls1bit32(unsigned int x)
{
int b = 31, s;
s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
s = 1; if (x << 1 == 0) s = 0; b -= s;
return b;
}
/* mask off an interrupt -- 1 is enable, 0 is disable */
static inline void mask_mv64340_irq(unsigned int irq)
{
uint32_t value;
if (irq < (irq_base + 32)) {
value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
value &= ~(1 << (irq - irq_base));
MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
} else {
value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
value &= ~(1 << (irq - irq_base - 32));
MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value);
}
}
/* unmask an interrupt -- 1 is enable, 0 is disable */
static inline void unmask_mv64340_irq(unsigned int irq)
{
uint32_t value;
if (irq < (irq_base + 32)) {
value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
value |= 1 << (irq - irq_base);
MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value);
} else {
value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
value |= 1 << (irq - irq_base - 32);
MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value);
}
}
/*
* Enables the IRQ on Marvell Chip
*/
static void enable_mv64340_irq(unsigned int irq)
{
unmask_mv64340_irq(irq);
}
/*
* Initialize the IRQ on Marvell Chip
*/
static unsigned int startup_mv64340_irq(unsigned int irq)
{
unmask_mv64340_irq(irq);
return 0;
}
/*
* Disables the IRQ on Marvell Chip
*/
static void disable_mv64340_irq(unsigned int irq)
{
mask_mv64340_irq(irq);
}
/*
* Masks and ACKs an IRQ
*/
static void mask_and_ack_mv64340_irq(unsigned int irq)
{
mask_mv64340_irq(irq);
}
/*
* End IRQ processing
*/
static void end_mv64340_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
unmask_mv64340_irq(irq);
}
/*
* Interrupt handler for interrupts coming from the Marvell chip.
* It could be built in ethernet ports etc...
*/
void ll_mv64340_irq(struct pt_regs *regs)
{
unsigned int irq_src_low, irq_src_high;
unsigned int irq_mask_low, irq_mask_high;
/* read the interrupt status registers */
irq_mask_low = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW);
irq_mask_high = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH);
irq_src_low = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_LOW);
irq_src_high = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_HIGH);
/* mask for just the interrupts we want */
irq_src_low &= irq_mask_low;
irq_src_high &= irq_mask_high;
if (irq_src_low)
do_IRQ(ls1bit32(irq_src_low) + irq_base, regs);
else
do_IRQ(ls1bit32(irq_src_high) + irq_base + 32, regs);
}
#define shutdown_mv64340_irq disable_mv64340_irq
struct irq_chip mv64340_irq_type = {
.typename = "MV-64340",
.startup = startup_mv64340_irq,
.shutdown = shutdown_mv64340_irq,
.enable = enable_mv64340_irq,
.disable = disable_mv64340_irq,
.ack = mask_and_ack_mv64340_irq,
.end = end_mv64340_irq,
};
void __init mv64340_irq_init(unsigned int base)
{
int i;
/* Reset irq handlers pointers to NULL */
for (i = base; i < base + 64; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 2;
irq_desc[i].chip = &mv64340_irq_type;
}
irq_base = base;
}
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