kernel/linux/arch/arm/mach-footbridge/irq.c

   1 /*
   2  *  linux/arch/arm/mach-footbridge/irq.c
   3  *
   4  *  Copyright (C) 1996-2000 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   22-Aug-1998 RMK    Restructured IRQ routines
  12  *   03-Sep-1998 PJB    Merged CATS support
  13  *   20-Jan-1998 RMK    Started merge of EBSA286, CATS and NetWinder
  14  *   26-Jan-1999 PJB    Don't use IACK on CATS
  15  *   16-Mar-1999 RMK    Added autodetect of ISA PICs
  16  */
  17 #include <linux/ioport.h>
  18 #include <linux/list.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/mach/irq.h>
  22
  23 #include <asm/hardware.h>
  24 #include <asm/hardware/dec21285.h>
  25 #include <asm/irq.h>
  26 #include <asm/io.h>
  27 #include <asm/mach-types.h>
  28
  29 extern void __init isa_init_irq(unsigned int irq);
  30
  31 /*
  32  * Footbridge IRQ translation table
  33  *  Converts from our IRQ numbers into FootBridge masks
  34  */
  35 static const int fb_irq_mask[] = {
  36         IRQ_MASK_UART_RX,       /*  0 */
  37         IRQ_MASK_UART_TX,       /*  1 */
  38         IRQ_MASK_TIMER1,        /*  2 */
  39         IRQ_MASK_TIMER2,        /*  3 */
  40         IRQ_MASK_TIMER3,        /*  4 */
  41         IRQ_MASK_IN0,           /*  5 */
  42         IRQ_MASK_IN1,           /*  6 */
  43         IRQ_MASK_IN2,           /*  7 */
  44         IRQ_MASK_IN3,           /*  8 */
  45         IRQ_MASK_DOORBELLHOST,  /*  9 */
  46         IRQ_MASK_DMA1,          /* 10 */
  47         IRQ_MASK_DMA2,          /* 11 */
  48         IRQ_MASK_PCI,           /* 12 */
  49         IRQ_MASK_SDRAMPARITY,   /* 13 */
  50         IRQ_MASK_I2OINPOST,     /* 14 */
  51         IRQ_MASK_PCI_ABORT,     /* 15 */
  52         IRQ_MASK_PCI_SERR,      /* 16 */
  53         IRQ_MASK_DISCARD_TIMER, /* 17 */
  54         IRQ_MASK_PCI_DPERR,     /* 18 */
  55         IRQ_MASK_PCI_PERR,      /* 19 */
  56 };
  57
  58 static void fb_mask_irq(unsigned int irq)
  59 {
  60         *CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
  61 }
  62
  63 static void fb_unmask_irq(unsigned int irq)
  64 {
  65         *CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
  66 }
  67
  68 static struct irqchip fb_chip = {
  69         .ack    = fb_mask_irq,
  70         .mask   = fb_mask_irq,
  71         .unmask = fb_unmask_irq,
  72 };
  73
  74 static void __init __fb_init_irq(void)
  75 {
  76         unsigned int irq;
  77
  78         /*
  79          * setup DC21285 IRQs
  80          */
  81         *CSR_IRQ_DISABLE = -1;
  82         *CSR_FIQ_DISABLE = -1;
  83
  84         for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
  85                 set_irq_chip(irq, &fb_chip);
  86                 set_irq_handler(irq, do_level_IRQ);
  87                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
  88         }
  89 }
  90
  91 void __init footbridge_init_irq(void)
  92 {
  93         __fb_init_irq();
  94
  95         if (!footbridge_cfn_mode())
  96                 return;
  97
  98         if (machine_is_ebsa285())
  99                 /* The following is dependent on which slot
 100                  * you plug the Southbridge card into.  We
 101                  * currently assume that you plug it into
 102                  * the right-hand most slot.
 103                  */
 104                 isa_init_irq(IRQ_PCI);
 105
 106         if (machine_is_cats())
 107                 isa_init_irq(IRQ_IN2);
 108
 109         if (machine_is_netwinder())
 110                 isa_init_irq(IRQ_IN3);
 111 }