arch/m68knommu/platform/68328/ints.c

   1 /*
   2  * linux/arch/m68knommu/platform/68328/ints.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file COPYING in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright 1996 Roman Zippel
   9  * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/irq.h>
  17 #include <asm/traps.h>
  18 #include <asm/io.h>
  19 #include <asm/machdep.h>
  20
  21 #if defined(CONFIG_M68328)
  22 #include <asm/MC68328.h>
  23 #elif defined(CONFIG_M68EZ328)
  24 #include <asm/MC68EZ328.h>
  25 #elif defined(CONFIG_M68VZ328)
  26 #include <asm/MC68VZ328.h>
  27 #endif
  28
  29 /* assembler routines */
  30 asmlinkage void system_call(void);
  31 asmlinkage void buserr(void);
  32 asmlinkage void trap(void);
  33 asmlinkage void trap3(void);
  34 asmlinkage void trap4(void);
  35 asmlinkage void trap5(void);
  36 asmlinkage void trap6(void);
  37 asmlinkage void trap7(void);
  38 asmlinkage void trap8(void);
  39 asmlinkage void trap9(void);
  40 asmlinkage void trap10(void);
  41 asmlinkage void trap11(void);
  42 asmlinkage void trap12(void);
  43 asmlinkage void trap13(void);
  44 asmlinkage void trap14(void);
  45 asmlinkage void trap15(void);
  46 asmlinkage void trap33(void);
  47 asmlinkage void trap34(void);
  48 asmlinkage void trap35(void);
  49 asmlinkage void trap36(void);
  50 asmlinkage void trap37(void);
  51 asmlinkage void trap38(void);
  52 asmlinkage void trap39(void);
  53 asmlinkage void trap40(void);
  54 asmlinkage void trap41(void);
  55 asmlinkage void trap42(void);
  56 asmlinkage void trap43(void);
  57 asmlinkage void trap44(void);
  58 asmlinkage void trap45(void);
  59 asmlinkage void trap46(void);
  60 asmlinkage void trap47(void);
  61 asmlinkage irqreturn_t bad_interrupt(int, void *);
  62 asmlinkage irqreturn_t inthandler(void);
  63 asmlinkage irqreturn_t inthandler1(void);
  64 asmlinkage irqreturn_t inthandler2(void);
  65 asmlinkage irqreturn_t inthandler3(void);
  66 asmlinkage irqreturn_t inthandler4(void);
  67 asmlinkage irqreturn_t inthandler5(void);
  68 asmlinkage irqreturn_t inthandler6(void);
  69 asmlinkage irqreturn_t inthandler7(void);
  70
  71 extern e_vector *_ramvec;
  72
  73 /* The number of spurious interrupts */
  74 volatile unsigned int num_spurious;
  75
  76 /*
  77  * This function should be called during kernel startup to initialize
  78  * the machine vector table.
  79  */
  80 void __init init_vectors(void)
  81 {
  82         int i;
  83
  84         /* set up the vectors */
  85         for (i = 72; i < 256; ++i)
  86                 _ramvec[i] = (e_vector) bad_interrupt;
  87
  88         _ramvec[32] = system_call;
  89
  90         _ramvec[65] = (e_vector) inthandler1;
  91         _ramvec[66] = (e_vector) inthandler2;
  92         _ramvec[67] = (e_vector) inthandler3;
  93         _ramvec[68] = (e_vector) inthandler4;
  94         _ramvec[69] = (e_vector) inthandler5;
  95         _ramvec[70] = (e_vector) inthandler6;
  96         _ramvec[71] = (e_vector) inthandler7;
  97
  98         IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
  99
 100         /* turn off all interrupts */
 101         IMR = ~0;
 102 }
 103
 104 /* The 68k family did not have a good way to determine the source
 105  * of interrupts until later in the family.  The EC000 core does
 106  * not provide the vector number on the stack, we vector everything
 107  * into one vector and look in the blasted mask register...
 108  * This code is designed to be fast, almost constant time, not clean!
 109  */
 110 void process_int(int vec, struct pt_regs *fp)
 111 {
 112         int irq;
 113         int mask;
 114
 115         unsigned long pend = ISR;
 116
 117         while (pend) {
 118                 if (pend & 0x0000ffff) {
 119                         if (pend & 0x000000ff) {
 120                                 if (pend & 0x0000000f) {
 121                                         mask = 0x00000001;
 122                                         irq = 0;
 123                                 } else {
 124                                         mask = 0x00000010;
 125                                         irq = 4;
 126                                 }
 127                         } else {
 128                                 if (pend & 0x00000f00) {
 129                                         mask = 0x00000100;
 130                                         irq = 8;
 131                                 } else {
 132                                         mask = 0x00001000;
 133                                         irq = 12;
 134                                 }
 135                         }
 136                 } else {
 137                         if (pend & 0x00ff0000) {
 138                                 if (pend & 0x000f0000) {
 139                                         mask = 0x00010000;
 140                                         irq = 16;
 141                                 } else {
 142                                         mask = 0x00100000;
 143                                         irq = 20;
 144                                 }
 145                         } else {
 146                                 if (pend & 0x0f000000) {
 147                                         mask = 0x01000000;
 148                                         irq = 24;
 149                                 } else {
 150                                         mask = 0x10000000;
 151                                         irq = 28;
 152                                 }
 153                         }
 154                 }
 155
 156                 while (! (mask & pend)) {
 157                         mask <<=1;
 158                         irq++;
 159                 }
 160
 161                 do_IRQ(irq, fp);
 162                 pend &= ~mask;
 163         }
 164 }
 165
 166 void enable_vector(unsigned int irq)
 167 {
 168         IMR &= ~(1<<irq);
 169 }
 170
 171 void disable_vector(unsigned int irq)
 172 {
 173         IMR |= (1<<irq);
 174 }
 175
 176 void ack_vector(unsigned int irq)
 177 {
 178         /* Nothing needed */
 179 }
 180