/* * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file COPYING in the main directory of this archive * for more details. * * 07/03/96: Timer initialization, and thus mach_sched_init(), *           removed from request_irq() and moved to init_time(). *           We should therefore consider renaming our add_isr() and *           remove_isr() to request_irq() and free_irq() *           respectively, so they are compliant with the other *           architectures.                                     /Jes * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls. *           Removed irq list support, if any machine needs an irq server *           it must implement this itself (as it's already done), instead *           only default handler are used with mach_default_handler. *           request_irq got some flags different from other architectures: *           - IRQ_FLG_REPLACE : Replace an existing handler (the default one *                               can be replaced without this flag) *           - IRQ_FLG_LOCK : handler can't be replaced *           There are other machine depending flags, see there *           If you want to replace a default handler you should know what *           you're doing, since it might handle different other irq sources *           which must be served                               /Roman Zippel */ #include <linux/module.h>#include <linux/types.h>#include <linux/sched.h>#include <linux/interrupt.h>#include <linux/kernel_stat.h>#include <linux/errno.h>#include <linux/init.h> #include <asm/setup.h>#include <asm/system.h>#include <asm/irq.h>#include <asm/traps.h>#include <asm/page.h>#include <asm/machdep.h>#include <asm/cacheflush.h>#include <asm/irq_regs.h> #ifdef CONFIG_Q40#include <asm/q40ints.h>#endif extern u32 auto_irqhandler_fixup[];extern u32 user_irqhandler_fixup[];extern u16 user_irqvec_fixup[]; /* table for system interrupt handlers */static struct irq_node *irq_list[NR_IRQS];static struct irq_controller *irq_controller[NR_IRQS];static int irq_depth[NR_IRQS]; static int m68k_first_user_vec; static struct irq_controller auto_irq_controller = {	.name		= "auto",	.lock		= SPIN_LOCK_UNLOCKED,	.startup	= m68k_irq_startup,	.shutdown	= m68k_irq_shutdown,}; static struct irq_controller user_irq_controller = {	.name		= "user",	.lock		= SPIN_LOCK_UNLOCKED,	.startup	= m68k_irq_startup,	.shutdown	= m68k_irq_shutdown,}; #define NUM_IRQ_NODES 100static irq_node_t nodes[NUM_IRQ_NODES]; /* * void init_IRQ(void) * * Parameters:	None * * Returns:	Nothing * * This function should be called during kernel startup to initialize * the IRQ handling routines. */ void __init init_IRQ(void){	int i; 	/* assembly irq entry code relies on this... */	if (HARDIRQ_MASK != 0x00ff0000) {		extern void hardirq_mask_is_broken(void);		hardirq_mask_is_broken();	} 	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)		irq_controller[i] = &auto_irq_controller; 	mach_init_IRQ();} /** * m68k_setup_auto_interrupt * @handler: called from auto vector interrupts * * setup the handler to be called from auto vector interrupts instead of the * standard __m68k_handle_int(), it will be called with irq numbers in the range * from IRQ_AUTO_1 - IRQ_AUTO_7. */void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *)){	if (handler)		*auto_irqhandler_fixup = (u32)handler;	flush_icache();} /** * m68k_setup_user_interrupt * @vec: first user vector interrupt to handle * @cnt: number of active user vector interrupts * @handler: called from user vector interrupts * * setup user vector interrupts, this includes activating the specified range * of interrupts, only then these interrupts can be requested (note: this is * different from auto vector interrupts). An optional handler can be installed * to be called instead of the default __m68k_handle_int(), it will be called * with irq numbers starting from IRQ_USER. */void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,				      void (*handler)(unsigned int, struct pt_regs *)){	int i; 	BUG_ON(IRQ_USER + cnt >= NR_IRQS);	m68k_first_user_vec = vec;	for (i = 0; i < cnt; i++)		irq_controller[IRQ_USER + i] = &user_irq_controller;	*user_irqvec_fixup = vec - IRQ_USER;	if (handler)		*user_irqhandler_fixup = (u32)handler;	flush_icache();} /** * m68k_setup_irq_controller * @contr: irq controller which controls specified irq * @irq: first irq to be managed by the controller * * Change the controller for the specified range of irq, which will be used to * manage these irq. auto/user irq already have a default controller, which can * be changed as well, but the controller probably should use m68k_irq_startup/ * m68k_irq_shutdown. */void m68k_setup_irq_controller(struct irq_controller *contr, unsigned int irq,			       unsigned int cnt){	int i; 	for (i = 0; i < cnt; i++)		irq_controller[irq + i] = contr;} irq_node_t *new_irq_node(void){	irq_node_t *node;	short i; 	for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {		if (!node->handler) {			memset(node, 0, sizeof(*node));			return node;		}	} 	printk ("new_irq_node: out of nodes\n");	return NULL;} int setup_irq(unsigned int irq, struct irq_node *node){	struct irq_controller *contr;	struct irq_node **prev;	unsigned long flags; 	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {		printk("%s: Incorrect IRQ %d from %s\n",		       __FUNCTION__, irq, node->devname);		return -ENXIO;	} 	spin_lock_irqsave(&contr->lock, flags); 	prev = irq_list + irq;	if (*prev) {		/* Can't share interrupts unless both agree to */		if (!((*prev)->flags & node->flags & IRQF_SHARED)) {			spin_unlock_irqrestore(&contr->lock, flags);			return -EBUSY;		}		while (*prev)			prev = &(*prev)->next;	} 	if (!irq_list[irq]) {		if (contr->startup)			contr->startup(irq);		else			contr->enable(irq);	}	node->next = NULL;	*prev = node; 	spin_unlock_irqrestore(&contr->lock, flags); 	return 0;} int request_irq(unsigned int irq,		irq_handler_t handler,		unsigned long flags, const char *devname, void *dev_id){	struct irq_node *node;	int res; 	node = new_irq_node();	if (!node)		return -ENOMEM; 	node->handler = handler;	node->flags   = flags;	node->dev_id  = dev_id;	node->devname = devname; 	res = setup_irq(irq, node);	if (res)		node->handler = NULL; 	return res;} EXPORT_SYMBOL(request_irq); void free_irq(unsigned int irq, void *dev_id){	struct irq_controller *contr;	struct irq_node **p, *node;	unsigned long flags; 	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {		printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);		return;	} 	spin_lock_irqsave(&contr->lock, flags); 	p = irq_list + irq;	while ((node = *p)) {		if (node->dev_id == dev_id)			break;		p = &node->next;	} 	if (node) {		*p = node->next;		node->handler = NULL;	} else		printk("%s: Removing probably wrong IRQ %d\n",		       __FUNCTION__, irq); 	if (!irq_list[irq]) {		if (contr->shutdown)			contr->shutdown(irq);		else			contr->disable(irq);	} 	spin_unlock_irqrestore(&contr->lock, flags);} EXPORT_SYMBOL(free_irq); void enable_irq(unsigned int irq){	struct irq_controller *contr;	unsigned long flags; 	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {		printk("%s: Incorrect IRQ %d\n",		       __FUNCTION__, irq);		return;	} 	spin_lock_irqsave(&contr->lock, flags);	if (irq_depth[irq]) {		if (!--irq_depth[irq]) {			if (contr->enable)				contr->enable(irq);		}	} else		WARN_ON(1);	spin_unlock_irqrestore(&contr->lock, flags);} EXPORT_SYMBOL(enable_irq); void disable_irq(unsigned int irq){	struct irq_controller *contr;	unsigned long flags; 	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {		printk("%s: Incorrect IRQ %d\n",		       __FUNCTION__, irq);		return;	} 	spin_lock_irqsave(&contr->lock, flags);	if (!irq_depth[irq]++) {		if (contr->disable)			contr->disable(irq);	}	spin_unlock_irqrestore(&contr->lock, flags);} EXPORT_SYMBOL(disable_irq); int m68k_irq_startup(unsigned int irq){	if (irq <= IRQ_AUTO_7)		vectors[VEC_SPUR + irq] = auto_inthandler;	else		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;	return 0;} void m68k_irq_shutdown(unsigned int irq){	if (irq <= IRQ_AUTO_7)		vectors[VEC_SPUR + irq] = bad_inthandler;	else		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;}  /* * Do we need these probe functions on the m68k? * *  ... may be useful with ISA devices */unsigned long probe_irq_on (void){#ifdef CONFIG_Q40	if (MACH_IS_Q40)		return q40_probe_irq_on();#endif	return 0;} EXPORT_SYMBOL(probe_irq_on); int probe_irq_off (unsigned long irqs){#ifdef CONFIG_Q40	if (MACH_IS_Q40)		return q40_probe_irq_off(irqs);#endif	return 0;} EXPORT_SYMBOL(probe_irq_off); unsigned int irq_canonicalize(unsigned int irq){#ifdef CONFIG_Q40	if (MACH_IS_Q40 && irq == 11)		irq = 10;#endif	return irq;} EXPORT_SYMBOL(irq_canonicalize); asmlinkage void m68k_handle_int(unsigned int irq){	struct irq_node *node;	kstat_cpu(0).irqs[irq]++;	node = irq_list[irq];	do {		node->handler(irq, node->dev_id);		node = node->next;	} while (node);} asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs){	struct pt_regs *old_regs;	old_regs = set_irq_regs(regs);	m68k_handle_int(irq);	set_irq_regs(old_regs);} asmlinkage void handle_badint(struct pt_regs *regs){	kstat_cpu(0).irqs[0]++;	printk("unexpected interrupt from %u\n", regs->vector);} int show_interrupts(struct seq_file *p, void *v){	struct irq_controller *contr;	struct irq_node *node;	int i = *(loff_t *) v; 	/* autovector interrupts */	if (irq_list[i]) {		contr = irq_controller[i];		node = irq_list[i];		seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);		while ((node = node->next))			seq_printf(p, ", %s", node->devname);		seq_puts(p, "\n");	}	return 0;} void init_irq_proc(void){	/* Insert /proc/irq driver here */}