/*
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* This file define the irq handler for MSP SLM subsystem interrupts.
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*
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* Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
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* Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <asm/mipsregs.h>
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#include <msp_slp_int.h>
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#include <msp_regs.h>
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static inline void unmask_msp_slp_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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/* check for PER interrupt range */
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if (irq < MSP_PER_INTBASE)
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*SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
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else
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*PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
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}
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static inline void mask_msp_slp_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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/* check for PER interrupt range */
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if (irq < MSP_PER_INTBASE)
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*SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
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else
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*PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
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}
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/*
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* While we ack the interrupt interrupts are disabled and thus we don't need
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* to deal with concurrency issues. Same for msp_slp_irq_end.
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*/
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static inline void ack_msp_slp_irq(struct irq_data *d)
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{
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unsigned int irq = d->irq;
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/* check for PER interrupt range */
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if (irq < MSP_PER_INTBASE)
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*SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
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else
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*PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
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}
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static struct irq_chip msp_slp_irq_controller = {
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.name = "MSP_SLP",
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.irq_ack = ack_msp_slp_irq,
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.irq_mask = mask_msp_slp_irq,
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.irq_unmask = unmask_msp_slp_irq,
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};
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void __init msp_slp_irq_init(void)
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{
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int i;
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/* Mask/clear interrupts. */
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*SLP_INT_MSK_REG = 0x00000000;
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*PER_INT_MSK_REG = 0x00000000;
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*SLP_INT_STS_REG = 0xFFFFFFFF;
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*PER_INT_STS_REG = 0xFFFFFFFF;
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/* initialize all the IRQ descriptors */
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for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
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irq_set_chip_and_handler(i, &msp_slp_irq_controller,
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handle_level_irq);
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}
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void msp_slp_irq_dispatch(void)
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{
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u32 pending;
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int intbase;
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intbase = MSP_SLP_INTBASE;
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pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
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/* check for PER interrupt */
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if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
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intbase = MSP_PER_INTBASE;
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pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
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}
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/* check for spurious interrupt */
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if (pending == 0x00000000) {
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printk(KERN_ERR "Spurious %s interrupt?\n",
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(intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
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return;
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}
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/* dispatch the irq */
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do_IRQ(ffs(pending) + intbase - 1);
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}
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