mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-23 09:56:00 +00:00
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
|
|
* This file define the irq handler for MSP SLM subsystem interrupts.
|
|
*
|
|
* Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
|
|
* Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.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/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/system.h>
|
|
|
|
#include <msp_slp_int.h>
|
|
#include <msp_regs.h>
|
|
|
|
static inline void unmask_msp_slp_irq(struct irq_data *d)
|
|
{
|
|
unsigned int irq = d->irq;
|
|
|
|
/* check for PER interrupt range */
|
|
if (irq < MSP_PER_INTBASE)
|
|
*SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
|
|
else
|
|
*PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
|
|
}
|
|
|
|
static inline void mask_msp_slp_irq(struct irq_data *d)
|
|
{
|
|
unsigned int irq = d->irq;
|
|
|
|
/* check for PER interrupt range */
|
|
if (irq < MSP_PER_INTBASE)
|
|
*SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
|
|
else
|
|
*PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
|
|
}
|
|
|
|
/*
|
|
* While we ack the interrupt interrupts are disabled and thus we don't need
|
|
* to deal with concurrency issues. Same for msp_slp_irq_end.
|
|
*/
|
|
static inline void ack_msp_slp_irq(struct irq_data *d)
|
|
{
|
|
unsigned int irq = d->irq;
|
|
|
|
/* check for PER interrupt range */
|
|
if (irq < MSP_PER_INTBASE)
|
|
*SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
|
|
else
|
|
*PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
|
|
}
|
|
|
|
static struct irq_chip msp_slp_irq_controller = {
|
|
.name = "MSP_SLP",
|
|
.irq_ack = ack_msp_slp_irq,
|
|
.irq_mask = mask_msp_slp_irq,
|
|
.irq_unmask = unmask_msp_slp_irq,
|
|
};
|
|
|
|
void __init msp_slp_irq_init(void)
|
|
{
|
|
int i;
|
|
|
|
/* Mask/clear interrupts. */
|
|
*SLP_INT_MSK_REG = 0x00000000;
|
|
*PER_INT_MSK_REG = 0x00000000;
|
|
*SLP_INT_STS_REG = 0xFFFFFFFF;
|
|
*PER_INT_STS_REG = 0xFFFFFFFF;
|
|
|
|
/* initialize all the IRQ descriptors */
|
|
for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
|
|
irq_set_chip_and_handler(i, &msp_slp_irq_controller,
|
|
handle_level_irq);
|
|
}
|
|
|
|
void msp_slp_irq_dispatch(void)
|
|
{
|
|
u32 pending;
|
|
int intbase;
|
|
|
|
intbase = MSP_SLP_INTBASE;
|
|
pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
|
|
|
|
/* check for PER interrupt */
|
|
if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
|
|
intbase = MSP_PER_INTBASE;
|
|
pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
|
|
}
|
|
|
|
/* check for spurious interrupt */
|
|
if (pending == 0x00000000) {
|
|
printk(KERN_ERR "Spurious %s interrupt?\n",
|
|
(intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
|
|
return;
|
|
}
|
|
|
|
/* dispatch the irq */
|
|
do_IRQ(ffs(pending) + intbase - 1);
|
|
}
|