-static irqreturn_t atari_call_irq_list( int irq, void *dev_id, struct pt_regs *fp )
-{
- irq_node_t *node;
-
- for (node = (irq_node_t *)dev_id; node; node = node->next)
- node->handler(irq, node->dev_id, fp);
- return IRQ_HANDLED;
-}
-
-
-/*
- * atari_request_irq : add an interrupt service routine for a particular
- * machine specific interrupt source.
- * If the addition was successful, it returns 0.
- */
-
-int atari_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
-{
- int vector;
- unsigned long oflags = flags;
-
- /*
- * The following is a hack to make some PCI card drivers work,
- * which set the SA_SHIRQ flag.
- */
-
- flags &= ~SA_SHIRQ;
-
- if (flags == SA_INTERRUPT) {
- printk ("%s: SA_INTERRUPT changed to IRQ_TYPE_SLOW for %s\n",
- __FUNCTION__, devname);
- flags = IRQ_TYPE_SLOW;
- }
- if (flags < IRQ_TYPE_SLOW || flags > IRQ_TYPE_PRIO) {
- printk ("%s: Bad irq type 0x%lx <0x%lx> requested from %s\n",
- __FUNCTION__, flags, oflags, devname);
- return -EINVAL;
- }
- if (!IS_VALID_INTNO(irq)) {
- printk ("%s: Unknown irq %d requested from %s\n",
- __FUNCTION__, irq, devname);
- return -ENXIO;
- }
- vector = IRQ_SOURCE_TO_VECTOR(irq);
-
- /*
- * Check type/source combination: slow ints are (currently)
- * only possible for MFP-interrupts.
- */
- if (flags == IRQ_TYPE_SLOW &&
- (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE)) {
- printk ("%s: Slow irq requested for non-MFP source %d from %s\n",
- __FUNCTION__, irq, devname);
- return -EINVAL;
- }
-
- if (vectors[vector] == bad_interrupt) {
- /* int has no handler yet */
- irq_handler[irq].handler = handler;
- irq_handler[irq].dev_id = dev_id;
- irq_param[irq].flags = flags;
- irq_param[irq].devname = devname;
- vectors[vector] =
- (flags == IRQ_TYPE_SLOW) ? slow_handlers[irq-STMFP_SOURCE_BASE] :
- (flags == IRQ_TYPE_FAST) ? atari_fast_irq_handler :
- atari_prio_irq_handler;
- /* If MFP int, also enable and umask it */
- atari_turnon_irq(irq);
- atari_enable_irq(irq);
-
- return 0;
- }
- else if (irq_param[irq].flags == flags) {
- /* old handler is of same type -> handlers can be chained */
- irq_node_t *node;
- unsigned long flags;
-
- local_irq_save(flags);
-
- if (irq_handler[irq].handler != atari_call_irq_list) {
- /* Only one handler yet, make a node for this first one */
- if (!(node = new_irq_node()))
- return -ENOMEM;
- node->handler = irq_handler[irq].handler;
- node->dev_id = irq_handler[irq].dev_id;
- node->devname = irq_param[irq].devname;
- node->next = NULL;
-
- irq_handler[irq].handler = atari_call_irq_list;
- irq_handler[irq].dev_id = node;
- irq_param[irq].devname = "chained";
- }
-
- if (!(node = new_irq_node()))
- return -ENOMEM;
- node->handler = handler;
- node->dev_id = dev_id;
- node->devname = devname;
- /* new handlers are put in front of the queue */
- node->next = irq_handler[irq].dev_id;
- irq_handler[irq].dev_id = node;
-
- local_irq_restore(flags);
- return 0;
- } else {
- printk ("%s: Irq %d allocated by other type int (call from %s)\n",
- __FUNCTION__, irq, devname);
- return -EBUSY;
- }
-}
-
-void atari_free_irq(unsigned int irq, void *dev_id)
-{
- unsigned long flags;
- int vector;
- irq_node_t **list, *node;
-
- if (!IS_VALID_INTNO(irq)) {
- printk("%s: Unknown irq %d\n", __FUNCTION__, irq);
- return;
- }
-
- vector = IRQ_SOURCE_TO_VECTOR(irq);
- if (vectors[vector] == bad_interrupt)
- goto not_found;
-
- local_irq_save(flags);
-
- if (irq_handler[irq].handler != atari_call_irq_list) {
- /* It's the only handler for the interrupt */
- if (irq_handler[irq].dev_id != dev_id) {
- local_irq_restore(flags);
- goto not_found;
- }
- irq_handler[irq].handler = NULL;
- irq_handler[irq].dev_id = NULL;
- irq_param[irq].devname = NULL;
- vectors[vector] = bad_interrupt;
- /* If MFP int, also disable it */
- atari_disable_irq(irq);
- atari_turnoff_irq(irq);
-
- local_irq_restore(flags);
- return;
- }
-
- /* The interrupt is chained, find the irq on the list */
- for(list = (irq_node_t **)&irq_handler[irq].dev_id; *list; list = &(*list)->next) {
- if ((*list)->dev_id == dev_id) break;
- }
- if (!*list) {
- local_irq_restore(flags);
- goto not_found;
- }
-
- (*list)->handler = NULL; /* Mark it as free for reallocation */
- *list = (*list)->next;
-
- /* If there's now only one handler, unchain the interrupt, i.e. plug in
- * the handler directly again and omit atari_call_irq_list */
- node = (irq_node_t *)irq_handler[irq].dev_id;
- if (node && !node->next) {
- irq_handler[irq].handler = node->handler;
- irq_handler[irq].dev_id = node->dev_id;
- irq_param[irq].devname = node->devname;
- node->handler = NULL; /* Mark it as free for reallocation */
- }
-
- local_irq_restore(flags);
- return;
-
-not_found:
- printk("%s: tried to remove invalid irq\n", __FUNCTION__);
- return;
-}
-
-