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   1 /*
   2  * arch/sh/boards/saturn/irq.c
   3  *
   4  * Copyright (C) 2002 Paul Mundt
   5  *
   6  * Released under the terms of the GNU GPL v2.0.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/interrupt.h>
  11 #include <asm/irq.h>
  12 #include <asm/io.h>
  13
  14 /*
  15  * Interrupts map out as follows:
  16  *
  17  *  Vector      Name            Mask
  18  *
  19  *      64      VBLANKIN        0x0001
  20  *      65      VBLANKOUT       0x0002
  21  *      66      HBLANKIN        0x0004
  22  *      67      TIMER0          0x0008
  23  *      68      TIMER1          0x0010
  24  *      69      DSPEND          0x0020
  25  *      70      SOUNDREQUEST    0x0040
  26  *      71      SYSTEMMANAGER   0x0080
  27  *      72      PAD             0x0100
  28  *      73      LEVEL2DMAEND    0x0200
  29  *      74      LEVEL1DMAEND    0x0400
  30  *      75      LEVEL0DMAEND    0x0800
  31  *      76      DMAILLEGAL      0x1000
  32  *      77      SRITEDRAWEND    0x2000
  33  *      78      ABUS            0x8000
  34  *
  35  */
  36 #define SATURN_IRQ_MIN          64      /* VBLANKIN */
  37 #define SATURN_IRQ_MAX          78      /* ABUS */
  38
  39 #define SATURN_IRQ_MASK         0xbfff
  40
  41 static inline u32 saturn_irq_mask(unsigned int irq_nr)
  42 {
  43         u32 mask;
  44
  45         mask = (1 << (irq_nr - SATURN_IRQ_MIN));
  46         mask <<= (irq_nr == SATURN_IRQ_MAX);
  47         mask &= SATURN_IRQ_MASK;
  48
  49         return mask;
  50 }
  51
  52 static inline void mask_saturn_irq(unsigned int irq_nr)
  53 {
  54         u32 mask;
  55
  56         mask = ctrl_inl(SATURN_IMR);
  57         mask |= saturn_irq_mask(irq_nr);
  58         ctrl_outl(mask, SATURN_IMR);
  59 }
  60
  61 static inline void unmask_saturn_irq(unsigned int irq_nr)
  62 {
  63         u32 mask;
  64
  65         mask = ctrl_inl(SATURN_IMR);
  66         mask &= ~saturn_irq_mask(irq_nr);
  67         ctrl_outl(mask, SATURN_IMR);
  68 }
  69
  70 static void disable_saturn_irq(unsigned int irq_nr)
  71 {
  72         mask_saturn_irq(irq_nr);
  73 }
  74
  75 static void enable_saturn_irq(unsigned int irq_nr)
  76 {
  77         unmask_saturn_irq(irq_nr);
  78 }
  79
  80 static void mask_and_ack_saturn_irq(unsigned int irq_nr)
  81 {
  82         mask_saturn_irq(irq_nr);
  83 }
  84
  85 static void end_saturn_irq(unsigned int irq_nr)
  86 {
  87         if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
  88                 unmask_saturn_irq(irq_nr);
  89 }
  90
  91 static unsigned int startup_saturn_irq(unsigned int irq_nr)
  92 {
  93         unmask_saturn_irq(irq_nr);
  94
  95         return 0;
  96 }
  97
  98 static void shutdown_saturn_irq(unsigned int irq_nr)
  99 {
 100         mask_saturn_irq(irq_nr);
 101 }
 102
 103 static struct hw_interrupt_type saturn_int = {
 104         .typename       = "Saturn",
 105         .enable         = enable_saturn_irq,
 106         .disable        = disable_saturn_irq,
 107         .ack            = mask_and_ack_saturn_irq,
 108         .end            = end_saturn_irq,
 109         .startup        = startup_saturn_irq,
 110         .shutdown       = shutdown_saturn_irq,
 111 };
 112
 113 int saturn_irq_demux(int irq_nr)
 114 {
 115         /* FIXME */
 116         return irq_nr;
 117 }
 118