arch/m68k/kernel/ints.c

   1 /*
   2  * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
   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  * 07/03/96: Timer initialization, and thus mach_sched_init(),
   9  *           removed from request_irq() and moved to init_time().
  10  *           We should therefore consider renaming our add_isr() and
  11  *           remove_isr() to request_irq() and free_irq()
  12  *           respectively, so they are compliant with the other
  13  *           architectures.                                     /Jes
  14  * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
  15  *           Removed irq list support, if any machine needs an irq server
  16  *           it must implement this itself (as it's already done), instead
  17  *           only default handler are used with mach_default_handler.
  18  *           request_irq got some flags different from other architectures:
  19  *           - IRQ_FLG_REPLACE : Replace an existing handler (the default one
  20  *                               can be replaced without this flag)
  21  *           - IRQ_FLG_LOCK : handler can't be replaced
  22  *           There are other machine depending flags, see there
  23  *           If you want to replace a default handler you should know what
  24  *           you're doing, since it might handle different other irq sources
  25  *           which must be served                               /Roman Zippel
  26  */
  27
  28 #include <linux/config.h>
  29 #include <linux/module.h>
  30 #include <linux/types.h>
  31 #include <linux/sched.h>
  32 #include <linux/kernel_stat.h>
  33 #include <linux/errno.h>
  34 #include <linux/init.h>
  35
  36 #include <asm/setup.h>
  37 #include <asm/system.h>
  38 #include <asm/irq.h>
  39 #include <asm/traps.h>
  40 #include <asm/page.h>
  41 #include <asm/machdep.h>
  42
  43 #ifdef CONFIG_Q40
  44 #include <asm/q40ints.h>
  45 #endif
  46
  47 /* table for system interrupt handlers */
  48 static irq_handler_t irq_list[SYS_IRQS];
  49
  50 static const char *default_names[SYS_IRQS] = {
  51         [0] = "spurious int",
  52         [1] = "int1 handler",
  53         [2] = "int2 handler",
  54         [3] = "int3 handler",
  55         [4] = "int4 handler",
  56         [5] = "int5 handler",
  57         [6] = "int6 handler",
  58         [7] = "int7 handler"
  59 };
  60
  61 /* The number of spurious interrupts */
  62 volatile unsigned int num_spurious;
  63
  64 #define NUM_IRQ_NODES 100
  65 static irq_node_t nodes[NUM_IRQ_NODES];
  66
  67 static void dummy_enable_irq(unsigned int irq);
  68 static void dummy_disable_irq(unsigned int irq);
  69 static int dummy_request_irq(unsigned int irq,
  70                 irqreturn_t (*handler) (int, void *, struct pt_regs *),
  71                 unsigned long flags, const char *devname, void *dev_id);
  72 static void dummy_free_irq(unsigned int irq, void *dev_id);
  73
  74 void (*enable_irq) (unsigned int) = dummy_enable_irq;
  75 void (*disable_irq) (unsigned int) = dummy_disable_irq;
  76
  77 int (*mach_request_irq) (unsigned int, irqreturn_t (*)(int, void *, struct pt_regs *),
  78                       unsigned long, const char *, void *) = dummy_request_irq;
  79 void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
  80
  81 void init_irq_proc(void);
  82
  83 /*
  84  * void init_IRQ(void)
  85  *
  86  * Parameters:  None
  87  *
  88  * Returns:     Nothing
  89  *
  90  * This function should be called during kernel startup to initialize
  91  * the IRQ handling routines.
  92  */
  93
  94 void __init init_IRQ(void)
  95 {
  96         int i;
  97
  98         /* assembly irq entry code relies on this... */
  99         if (HARDIRQ_MASK != 0x00ff0000) {
 100                 extern void hardirq_mask_is_broken(void);
 101                 hardirq_mask_is_broken();
 102         }
 103
 104         for (i = 0; i < SYS_IRQS; i++) {
 105                 if (mach_default_handler)
 106                         irq_list[i].handler = (*mach_default_handler)[i];
 107                 irq_list[i].flags   = 0;
 108                 irq_list[i].dev_id  = NULL;
 109                 irq_list[i].devname = default_names[i];
 110         }
 111
 112         for (i = 0; i < NUM_IRQ_NODES; i++)
 113                 nodes[i].handler = NULL;
 114
 115         mach_init_IRQ ();
 116 }
 117
 118 irq_node_t *new_irq_node(void)
 119 {
 120         irq_node_t *node;
 121         short i;
 122
 123         for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
 124                 if (!node->handler)
 125                         return node;
 126
 127         printk ("new_irq_node: out of nodes\n");
 128         return NULL;
 129 }
 130
 131 /*
 132  * We will keep these functions until I have convinced Linus to move
 133  * the declaration of them from include/linux/sched.h to
 134  * include/asm/irq.h.
 135  */
 136 int request_irq(unsigned int irq,
 137                 irqreturn_t (*handler) (int, void *, struct pt_regs *),
 138                 unsigned long flags, const char *devname, void *dev_id)
 139 {
 140         return mach_request_irq(irq, handler, flags, devname, dev_id);
 141 }
 142
 143 EXPORT_SYMBOL(request_irq);
 144
 145 void free_irq(unsigned int irq, void *dev_id)
 146 {
 147         mach_free_irq(irq, dev_id);
 148 }
 149
 150 EXPORT_SYMBOL(free_irq);
 151
 152 int cpu_request_irq(unsigned int irq,
 153                     irqreturn_t (*handler)(int, void *, struct pt_regs *),
 154                     unsigned long flags, const char *devname, void *dev_id)
 155 {
 156         if (irq < IRQ1 || irq > IRQ7) {
 157                 printk("%s: Incorrect IRQ %d from %s\n",
 158                        __FUNCTION__, irq, devname);
 159                 return -ENXIO;
 160         }
 161
 162 #if 0
 163         if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
 164                 if (irq_list[irq].flags & IRQ_FLG_LOCK) {
 165                         printk("%s: IRQ %d from %s is not replaceable\n",
 166                                __FUNCTION__, irq, irq_list[irq].devname);
 167                         return -EBUSY;
 168                 }
 169                 if (!(flags & IRQ_FLG_REPLACE)) {
 170                         printk("%s: %s can't replace IRQ %d from %s\n",
 171                                __FUNCTION__, devname, irq, irq_list[irq].devname);
 172                         return -EBUSY;
 173                 }
 174         }
 175 #endif
 176
 177         irq_list[irq].handler = handler;
 178         irq_list[irq].flags   = flags;
 179         irq_list[irq].dev_id  = dev_id;
 180         irq_list[irq].devname = devname;
 181         return 0;
 182 }
 183
 184 void cpu_free_irq(unsigned int irq, void *dev_id)
 185 {
 186         if (irq < IRQ1 || irq > IRQ7) {
 187                 printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
 188                 return;
 189         }
 190
 191         if (irq_list[irq].dev_id != dev_id)
 192                 printk("%s: Removing probably wrong IRQ %d from %s\n",
 193                        __FUNCTION__, irq, irq_list[irq].devname);
 194
 195         irq_list[irq].handler = (*mach_default_handler)[irq];
 196         irq_list[irq].flags   = 0;
 197         irq_list[irq].dev_id  = NULL;
 198         irq_list[irq].devname = default_names[irq];
 199 }
 200
 201 /*
 202  * Do we need these probe functions on the m68k?
 203  *
 204  *  ... may be useful with ISA devices
 205  */
 206 unsigned long probe_irq_on (void)
 207 {
 208 #ifdef CONFIG_Q40
 209         if (MACH_IS_Q40)
 210                 return q40_probe_irq_on();
 211 #endif
 212         return 0;
 213 }
 214
 215 EXPORT_SYMBOL(probe_irq_on);
 216
 217 int probe_irq_off (unsigned long irqs)
 218 {
 219 #ifdef CONFIG_Q40
 220         if (MACH_IS_Q40)
 221                 return q40_probe_irq_off(irqs);
 222 #endif
 223         return 0;
 224 }
 225
 226 EXPORT_SYMBOL(probe_irq_off);
 227
 228 static void dummy_enable_irq(unsigned int irq)
 229 {
 230         printk("calling uninitialized enable_irq()\n");
 231 }
 232
 233 static void dummy_disable_irq(unsigned int irq)
 234 {
 235         printk("calling uninitialized disable_irq()\n");
 236 }
 237
 238 static int dummy_request_irq(unsigned int irq,
 239                 irqreturn_t (*handler) (int, void *, struct pt_regs *),
 240                 unsigned long flags, const char *devname, void *dev_id)
 241 {
 242         printk("calling uninitialized request_irq()\n");
 243         return 0;
 244 }
 245
 246 static void dummy_free_irq(unsigned int irq, void *dev_id)
 247 {
 248         printk("calling uninitialized disable_irq()\n");
 249 }
 250
 251 asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
 252 {
 253         if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
 254                 vec -= VEC_SPUR;
 255                 kstat_cpu(0).irqs[vec]++;
 256                 irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
 257         } else {
 258                 if (mach_process_int)
 259                         mach_process_int(vec, fp);
 260                 else
 261                         panic("Can't process interrupt vector %ld\n", vec);
 262                 return;
 263         }
 264 }
 265
 266 int show_interrupts(struct seq_file *p, void *v)
 267 {
 268         int i = *(loff_t *) v;
 269
 270         /* autovector interrupts */
 271         if (i < SYS_IRQS) {
 272                 if (mach_default_handler) {
 273                         seq_printf(p, "auto %2d: %10u ", i,
 274                                        i ? kstat_cpu(0).irqs[i] : num_spurious);
 275                         seq_puts(p, "  ");
 276                         seq_printf(p, "%s\n", irq_list[i].devname);
 277                 }
 278         } else if (i == SYS_IRQS)
 279                 mach_get_irq_list(p, v);
 280         return 0;
 281 }
 282
 283 void init_irq_proc(void)
 284 {
 285         /* Insert /proc/irq driver here */
 286 }
 287