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
  21 static int ioasic_irq_base;
  22
  23
  24 static inline void unmask_ioasic_irq(unsigned int irq)
  25 {
  26         u32 simr;
  27
  28         simr = ioasic_read(IO_REG_SIMR);
  29         simr |= (1 << (irq - ioasic_irq_base));
  30         ioasic_write(IO_REG_SIMR, simr);
  31 }
  32
  33 static inline void mask_ioasic_irq(unsigned int irq)
  34 {
  35         u32 simr;
  36
  37         simr = ioasic_read(IO_REG_SIMR);
  38         simr &= ~(1 << (irq - ioasic_irq_base));
  39         ioasic_write(IO_REG_SIMR, simr);
  40 }
  41
  42 static inline void clear_ioasic_irq(unsigned int irq)
  43 {
  44         u32 sir;
  45
  46         sir = ~(1 << (irq - ioasic_irq_base));
  47         ioasic_write(IO_REG_SIR, sir);
  48 }
  49
  50 static inline void ack_ioasic_irq(unsigned int irq)
  51 {
  52         mask_ioasic_irq(irq);
  53         fast_iob();
  54 }
  55
  56 static inline void end_ioasic_irq(unsigned int irq)
  57 {
  58         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
  59                 unmask_ioasic_irq(irq);
  60 }
  61
  62 static struct irq_chip ioasic_irq_type = {
  63         .name = "IO-ASIC",
  64         .ack = ack_ioasic_irq,
  65         .mask = mask_ioasic_irq,
  66         .mask_ack = ack_ioasic_irq,
  67         .unmask = unmask_ioasic_irq,
  68 };
  69
  70
  71 #define unmask_ioasic_dma_irq unmask_ioasic_irq
  72
  73 #define mask_ioasic_dma_irq mask_ioasic_irq
  74
  75 #define ack_ioasic_dma_irq ack_ioasic_irq
  76
  77 static inline void end_ioasic_dma_irq(unsigned int irq)
  78 {
  79         clear_ioasic_irq(irq);
  80         fast_iob();
  81         end_ioasic_irq(irq);
  82 }
  83
  84 static struct irq_chip ioasic_dma_irq_type = {
  85         .name = "IO-ASIC-DMA",
  86         .ack = ack_ioasic_dma_irq,
  87         .mask = mask_ioasic_dma_irq,
  88         .mask_ack = ack_ioasic_dma_irq,
  89         .unmask = unmask_ioasic_dma_irq,
  90         .end = end_ioasic_dma_irq,
  91 };
  92
  93
  94 void __init init_ioasic_irqs(int base)
  95 {
  96         int i;
  97
  98         /* Mask interrupts. */
  99         ioasic_write(IO_REG_SIMR, 0);
 100         fast_iob();
 101
 102         for (i = base; i < base + IO_INR_DMA; i++)
 103                 set_irq_chip_and_handler(i, &ioasic_irq_type,
 104                                          handle_level_irq);
 105         for (; i < base + IO_IRQ_LINES; i++)
 106                 set_irq_chip(i, &ioasic_dma_irq_type);
 107
 108         ioasic_irq_base = base;
 109 }