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/* irq-mb93493.c: MB93493 companion chip interrupt handler
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* 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/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/mb93493-irqs.h>
#include <asm/mb93493-regs.h>
#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))
#define IRQ_ROUTING \
(IRQ_ROUTE_ONE(IRQ_MB93493_VDC) | \
IRQ_ROUTE_ONE(IRQ_MB93493_VCC) | \
IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) | \
IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) | \
IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) | \
IRQ_ROUTE_ONE(IRQ_MB93493_USB) | \
IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) | \
IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) | \
IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) | \
IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))
/*
* daughter board PIC operations
* - there is no way to ACK interrupts in the MB93493 chip
*/
static void frv_mb93493_mask(unsigned int irq)
{
uint32_t iqsr;
volatile void *piqsr;
if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
piqsr = __addr_MB93493_IQSR(1);
else
piqsr = __addr_MB93493_IQSR(0);
iqsr = readl(piqsr);
iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
writel(iqsr, piqsr);
}
static void frv_mb93493_ack(unsigned int irq)
{
}
static void frv_mb93493_unmask(unsigned int irq)
{
uint32_t iqsr;
volatile void *piqsr;
if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
piqsr = __addr_MB93493_IQSR(1);
else
piqsr = __addr_MB93493_IQSR(0);
iqsr = readl(piqsr);
iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
writel(iqsr, piqsr);
}
static struct irq_chip frv_mb93493_pic = {
.name = "mb93093",
.ack = frv_mb93493_ack,
.mask = frv_mb93493_mask,
.mask_ack = frv_mb93493_mask,
.unmask = frv_mb93493_unmask,
};
/*
* MB93493 PIC interrupt handler
*/
static irqreturn_t mb93493_interrupt(int irq, void *_piqsr, struct pt_regs *regs)
{
volatile void *piqsr = _piqsr;
uint32_t iqsr;
iqsr = readl(piqsr);
iqsr = iqsr & (iqsr >> 16) & 0xffff;
/* poll all the triggered IRQs */
while (iqsr) {
int irq;
asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
irq = 31 - irq;
iqsr &= ~(1 << irq);
generic_handle_irq(IRQ_BASE_MB93493 + irq, regs);
}
return IRQ_HANDLED;
}
/*
* define an interrupt action for each MB93493 PIC output
* - use dev_id to indicate the MB93493 PIC input to output mappings
*/
static struct irqaction mb93493_irq[2] = {
[0] = {
.handler = mb93493_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED,
.mask = CPU_MASK_NONE,
.name = "mb93493.0",
.dev_id = (void *) __addr_MB93493_IQSR(0),
},
[1] = {
.handler = mb93493_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED,
.mask = CPU_MASK_NONE,
.name = "mb93493.1",
.dev_id = (void *) __addr_MB93493_IQSR(1),
}
};
/*
* initialise the motherboard MB93493's PIC
*/
void __init mb93493_init(void)
{
int irq;
for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);
/* the MB93493 drives external IRQ inputs on the CPU PIC */
setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
}
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