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Linux/arch/mips/pmcs-msp71xx/msp_irq_slp.c

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  1 /*
  2  * This file define the irq handler for MSP SLM subsystem interrupts.
  3  *
  4  * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
  5  * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
  6  *
  7  * This program is free software; you can redistribute  it and/or modify it
  8  * under  the terms of  the GNU General  Public License as published by the
  9  * Free Software Foundation;  either version 2 of the  License, or (at your
 10  * option) any later version.
 11  */
 12 
 13 #include <linux/init.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/kernel.h>
 16 #include <linux/bitops.h>
 17 
 18 #include <asm/mipsregs.h>
 19 
 20 #include <msp_slp_int.h>
 21 #include <msp_regs.h>
 22 
 23 static inline void unmask_msp_slp_irq(struct irq_data *d)
 24 {
 25         unsigned int irq = d->irq;
 26 
 27         /* check for PER interrupt range */
 28         if (irq < MSP_PER_INTBASE)
 29                 *SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
 30         else
 31                 *PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
 32 }
 33 
 34 static inline void mask_msp_slp_irq(struct irq_data *d)
 35 {
 36         unsigned int irq = d->irq;
 37 
 38         /* check for PER interrupt range */
 39         if (irq < MSP_PER_INTBASE)
 40                 *SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
 41         else
 42                 *PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
 43 }
 44 
 45 /*
 46  * While we ack the interrupt interrupts are disabled and thus we don't need
 47  * to deal with concurrency issues.  Same for msp_slp_irq_end.
 48  */
 49 static inline void ack_msp_slp_irq(struct irq_data *d)
 50 {
 51         unsigned int irq = d->irq;
 52 
 53         /* check for PER interrupt range */
 54         if (irq < MSP_PER_INTBASE)
 55                 *SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
 56         else
 57                 *PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
 58 }
 59 
 60 static struct irq_chip msp_slp_irq_controller = {
 61         .name = "MSP_SLP",
 62         .irq_ack = ack_msp_slp_irq,
 63         .irq_mask = mask_msp_slp_irq,
 64         .irq_unmask = unmask_msp_slp_irq,
 65 };
 66 
 67 void __init msp_slp_irq_init(void)
 68 {
 69         int i;
 70 
 71         /* Mask/clear interrupts. */
 72         *SLP_INT_MSK_REG = 0x00000000;
 73         *PER_INT_MSK_REG = 0x00000000;
 74         *SLP_INT_STS_REG = 0xFFFFFFFF;
 75         *PER_INT_STS_REG = 0xFFFFFFFF;
 76 
 77         /* initialize all the IRQ descriptors */
 78         for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
 79                 irq_set_chip_and_handler(i, &msp_slp_irq_controller,
 80                                          handle_level_irq);
 81 }
 82 
 83 void msp_slp_irq_dispatch(void)
 84 {
 85         u32 pending;
 86         int intbase;
 87 
 88         intbase = MSP_SLP_INTBASE;
 89         pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
 90 
 91         /* check for PER interrupt */
 92         if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
 93                 intbase = MSP_PER_INTBASE;
 94                 pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
 95         }
 96 
 97         /* check for spurious interrupt */
 98         if (pending == 0x00000000) {
 99                 printk(KERN_ERR "Spurious %s interrupt?\n",
100                         (intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
101                 return;
102         }
103 
104         /* dispatch the irq */
105         do_IRQ(ffs(pending) + intbase - 1);
106 }
107 

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