arch/mips/dec/ioasic-irq.c

   1 /*
   2  *      DEC I/O ASIC interrupts.
   3  *
   4  *      Copyright (c) 2002, 2003  Maciej W. Rozycki
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/types.h>
  15
  16 #include <asm/dec/ioasic.h>
  17 #include <asm/dec/ioasic_addrs.h>
  18 #include <asm/dec/ioasic_ints.h>
  19
  20 static int ioasic_irq_base;
  21
  22 static void unmask_ioasic_irq(struct irq_data *d)
  23 {
  24         u32 simr;
  25
  26         simr = ioasic_read(IO_REG_SIMR);
  27         simr |= (1 << (d->irq - ioasic_irq_base));
  28         ioasic_write(IO_REG_SIMR, simr);
  29 }
  30
  31 static void mask_ioasic_irq(struct irq_data *d)
  32 {
  33         u32 simr;
  34
  35         simr = ioasic_read(IO_REG_SIMR);
  36         simr &= ~(1 << (d->irq - ioasic_irq_base));
  37         ioasic_write(IO_REG_SIMR, simr);
  38 }
  39
  40 static void ack_ioasic_irq(struct irq_data *d)
  41 {
  42         mask_ioasic_irq(d);
  43         fast_iob();
  44 }
  45
  46 static struct irq_chip ioasic_irq_type = {
  47         .name = "IO-ASIC",
  48         .irq_ack = ack_ioasic_irq,
  49         .irq_mask = mask_ioasic_irq,
  50         .irq_mask_ack = ack_ioasic_irq,
  51         .irq_unmask = unmask_ioasic_irq,
  52 };
  53
  54 void clear_ioasic_dma_irq(unsigned int irq)
  55 {
  56         u32 sir;
  57
  58         sir = ~(1 << (irq - ioasic_irq_base));
  59         ioasic_write(IO_REG_SIR, sir);
  60 }
  61
  62 static struct irq_chip ioasic_dma_irq_type = {
  63         .name = "IO-ASIC-DMA",
  64         .irq_ack = ack_ioasic_irq,
  65         .irq_mask = mask_ioasic_irq,
  66         .irq_mask_ack = ack_ioasic_irq,
  67         .irq_unmask = unmask_ioasic_irq,
  68 };
  69
  70 void __init init_ioasic_irqs(int base)
  71 {
  72         int i;
  73
  74         /* Mask interrupts. */
  75         ioasic_write(IO_REG_SIMR, 0);
  76         fast_iob();
  77
  78         for (i = base; i < base + IO_INR_DMA; i++)
  79                 irq_set_chip_and_handler(i, &ioasic_irq_type,
  80                                          handle_level_irq);
  81         for (; i < base + IO_IRQ_LINES; i++)
  82                 irq_set_chip(i, &ioasic_dma_irq_type);
  83
  84         ioasic_irq_base = base;
  85 }