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/module.h>
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/errno.h>
  18 #include <linux/interrupt.h>
  19
  20 #include <asm/system.h>
  21 #include <asm/irq.h>
  22 #include <asm/irqnode.h>
  23 #include <asm/traps.h>
  24 #include <asm/io.h>
  25 #include <asm/machdep.h>
  26 #include <asm/setup.h>
  27
  28 #if defined(CONFIG_M68328)
  29 #include <asm/MC68328.h>
  30 #elif defined(CONFIG_M68EZ328)
  31 #include <asm/MC68EZ328.h>
  32 #elif defined(CONFIG_M68VZ328)
  33 #include <asm/MC68VZ328.h>
  34 #endif
  35
  36 /* assembler routines */
  37 asmlinkage void system_call(void);
  38 asmlinkage void buserr(void);
  39 asmlinkage void trap(void);
  40 asmlinkage void trap3(void);
  41 asmlinkage void trap4(void);
  42 asmlinkage void trap5(void);
  43 asmlinkage void trap6(void);
  44 asmlinkage void trap7(void);
  45 asmlinkage void trap8(void);
  46 asmlinkage void trap9(void);
  47 asmlinkage void trap10(void);
  48 asmlinkage void trap11(void);
  49 asmlinkage void trap12(void);
  50 asmlinkage void trap13(void);
  51 asmlinkage void trap14(void);
  52 asmlinkage void trap15(void);
  53 asmlinkage void trap33(void);
  54 asmlinkage void trap34(void);
  55 asmlinkage void trap35(void);
  56 asmlinkage void trap36(void);
  57 asmlinkage void trap37(void);
  58 asmlinkage void trap38(void);
  59 asmlinkage void trap39(void);
  60 asmlinkage void trap40(void);
  61 asmlinkage void trap41(void);
  62 asmlinkage void trap42(void);
  63 asmlinkage void trap43(void);
  64 asmlinkage void trap44(void);
  65 asmlinkage void trap45(void);
  66 asmlinkage void trap46(void);
  67 asmlinkage void trap47(void);
  68 asmlinkage irqreturn_t bad_interrupt(int, void *);
  69 asmlinkage irqreturn_t inthandler(void);
  70 asmlinkage irqreturn_t inthandler1(void);
  71 asmlinkage irqreturn_t inthandler2(void);
  72 asmlinkage irqreturn_t inthandler3(void);
  73 asmlinkage irqreturn_t inthandler4(void);
  74 asmlinkage irqreturn_t inthandler5(void);
  75 asmlinkage irqreturn_t inthandler6(void);
  76 asmlinkage irqreturn_t inthandler7(void);
  77
  78 extern e_vector *_ramvec;
  79
  80 /* The number of spurious interrupts */
  81 volatile unsigned int num_spurious;
  82 unsigned int local_irq_count[NR_CPUS];
  83
  84 /* irq node variables for the 32 (potential) on chip sources */
  85 static irq_node_t int_irq_list[NR_IRQS];
  86
  87 /*
  88  * This function should be called during kernel startup to initialize
  89  * the IRQ handling routines.
  90  */
  91 void init_IRQ(void)
  92 {
  93         int i;
  94
  95         /* set up the vectors */
  96         for (i = 72; i < 256; ++i)
  97                 _ramvec[i] = (e_vector) bad_interrupt;
  98
  99         _ramvec[32] = system_call;
 100
 101         _ramvec[65] = (e_vector) inthandler1;
 102         _ramvec[66] = (e_vector) inthandler2;
 103         _ramvec[67] = (e_vector) inthandler3;
 104         _ramvec[68] = (e_vector) inthandler4;
 105         _ramvec[69] = (e_vector) inthandler5;
 106         _ramvec[70] = (e_vector) inthandler6;
 107         _ramvec[71] = (e_vector) inthandler7;
 108
 109         IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
 110
 111         /* initialize handlers */
 112         for (i = 0; i < NR_IRQS; i++) {
 113                 int_irq_list[i].handler = bad_interrupt;
 114                 int_irq_list[i].flags   = IRQ_FLG_STD;
 115                 int_irq_list[i].dev_id  = NULL;
 116                 int_irq_list[i].devname = NULL;
 117         }
 118
 119         /* turn off all interrupts */
 120         IMR = ~0;
 121 }
 122
 123 int request_irq(
 124         unsigned int irq,
 125         irq_handler_t handler,
 126         unsigned long flags,
 127         const char *devname,
 128         void *dev_id)
 129 {
 130         if (irq >= NR_IRQS) {
 131                 printk (KERN_ERR "%s: Unknown IRQ %d from %s\n", __FUNCTION__, irq, devname);
 132                 return -ENXIO;
 133         }
 134
 135         if (!(int_irq_list[irq].flags & IRQ_FLG_STD)) {
 136                 if (int_irq_list[irq].flags & IRQ_FLG_LOCK) {
 137                         printk(KERN_ERR "%s: IRQ %d from %s is not replaceable\n",
 138                                __FUNCTION__, irq, int_irq_list[irq].devname);
 139                         return -EBUSY;
 140                 }
 141                 if (flags & IRQ_FLG_REPLACE) {
 142                         printk(KERN_ERR "%s: %s can't replace IRQ %d from %s\n",
 143                                __FUNCTION__, devname, irq, int_irq_list[irq].devname);
 144                         return -EBUSY;
 145                 }
 146         }
 147
 148         int_irq_list[irq].handler = handler;
 149         int_irq_list[irq].flags   = flags;
 150         int_irq_list[irq].dev_id  = dev_id;
 151         int_irq_list[irq].devname = devname;
 152
 153         IMR &= ~(1<<irq);
 154
 155         return 0;
 156 }
 157
 158 EXPORT_SYMBOL(request_irq);
 159
 160 void free_irq(unsigned int irq, void *dev_id)
 161 {
 162         if (irq >= NR_IRQS) {
 163                 printk (KERN_ERR "%s: Unknown IRQ %d\n", __FUNCTION__, irq);
 164                 return;
 165         }
 166
 167         if (int_irq_list[irq].dev_id != dev_id)
 168                 printk(KERN_INFO "%s: removing probably wrong IRQ %d from %s\n",
 169                        __FUNCTION__, irq, int_irq_list[irq].devname);
 170
 171         int_irq_list[irq].handler = bad_interrupt;
 172         int_irq_list[irq].flags   = IRQ_FLG_STD;
 173         int_irq_list[irq].dev_id  = NULL;
 174         int_irq_list[irq].devname = NULL;
 175
 176         IMR |= 1<<irq;
 177 }
 178
 179 EXPORT_SYMBOL(free_irq);
 180
 181 int show_interrupts(struct seq_file *p, void *v)
 182 {
 183         int i = *(loff_t *) v;
 184
 185         if (i < NR_IRQS) {
 186                 if (int_irq_list[i].devname) {
 187                         seq_printf(p, "%3d: %10u ", i, kstat_cpu(0).irqs[i]);
 188                         if (int_irq_list[i].flags & IRQ_FLG_LOCK)
 189                                 seq_printf(p, "L ");
 190                         else
 191                                 seq_printf(p, "  ");
 192                         seq_printf(p, "%s\n", int_irq_list[i].devname);
 193                 }
 194         }
 195         if (i == NR_IRQS)
 196                 seq_printf(p, "   : %10u   spurious\n", num_spurious);
 197
 198         return 0;
 199 }
 200
 201 /* The 68k family did not have a good way to determine the source
 202  * of interrupts until later in the family.  The EC000 core does
 203  * not provide the vector number on the stack, we vector everything
 204  * into one vector and look in the blasted mask register...
 205  * This code is designed to be fast, almost constant time, not clean!
 206  */
 207 void process_int(int vec, struct pt_regs *fp)
 208 {
 209         int irq;
 210         int mask;
 211
 212         unsigned long pend = ISR;
 213
 214         while (pend) {
 215                 if (pend & 0x0000ffff) {
 216                         if (pend & 0x000000ff) {
 217                                 if (pend & 0x0000000f) {
 218                                         mask = 0x00000001;
 219                                         irq = 0;
 220                                 } else {
 221                                         mask = 0x00000010;
 222                                         irq = 4;
 223                                 }
 224                         } else {
 225                                 if (pend & 0x00000f00) {
 226                                         mask = 0x00000100;
 227                                         irq = 8;
 228                                 } else {
 229                                         mask = 0x00001000;
 230                                         irq = 12;
 231                                 }
 232                         }
 233                 } else {
 234                         if (pend & 0x00ff0000) {
 235                                 if (pend & 0x000f0000) {
 236                                         mask = 0x00010000;
 237                                         irq = 16;
 238                                 } else {
 239                                         mask = 0x00100000;
 240                                         irq = 20;
 241                                 }
 242                         } else {
 243                                 if (pend & 0x0f000000) {
 244                                         mask = 0x01000000;
 245                                         irq = 24;
 246                                 } else {
 247                                         mask = 0x10000000;
 248                                         irq = 28;
 249                                 }
 250                         }
 251                 }
 252
 253                 while (! (mask & pend)) {
 254                         mask <<=1;
 255                         irq++;
 256                 }
 257
 258                 kstat_cpu(0).irqs[irq]++;
 259
 260                 if (int_irq_list[irq].handler) {
 261                         int_irq_list[irq].handler(irq, int_irq_list[irq].dev_id, fp);
 262                 } else {
 263                         printk(KERN_ERR "unregistered interrupt %d!\nTurning it off in the IMR...\n", irq);
 264                         IMR |= mask;
 265                 }
 266                 pend &= ~mask;
 267         }
 268 }