/* * 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(unsigned int 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(unsigned int 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(unsigned int irq){	mask_slp_irq(irq);	/*	 * only really necessary for 18, 16-14 and sometimes 3:0 (since	 * these can be edge sensitive) but it doesn't hurt  for the others.	 */	/* 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",	.ack = ack_msp_slp_irq,	.mask = ack_msp_slp_irq,	.mask_ack = ack_msp_slp_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++)		set_irq_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);}