[deliverable/linux.git] / arch / sparc / kernel / sun4d_irq.c

/*  $Id: sun4d_irq.c,v 1.29 2001/12/11 04:55:51 davem Exp $
 *  arch/sparc/kernel/sun4d_irq.c:
 *			SS1000/SC2000 interrupt handling.
 *
 *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *  Heavily based on arch/sparc/kernel/irq.c.
 */

#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>

#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/psr.h>
#include <asm/smp.h>
#include <asm/vaddrs.h>
#include <asm/timer.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>
#include <asm/sbi.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>

/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
/* #define DISTRIBUTE_IRQS */

struct sun4d_timer_regs *sun4d_timers;
#define TIMER_IRQ	10

#define MAX_STATIC_ALLOC	4
extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
extern int static_irq_count;
unsigned char cpu_leds[32];
#ifdef CONFIG_SMP
unsigned char sbus_tid[32];
#endif

static struct irqaction *irq_action[NR_IRQS];
extern spinlock_t irq_action_lock;

struct sbus_action {
	struct irqaction *action;
	/* For SMP this needs to be extended */
} *sbus_actions;

static int pil_to_sbus[] = {
	0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
};

static int sbus_to_pil[] = {
	0, 2, 3, 5, 7, 9, 11, 13,
};

static int nsbi;
#ifdef CONFIG_SMP
DEFINE_SPINLOCK(sun4d_imsk_lock);
#endif

int show_sun4d_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *) v, j = 0, k = 0, sbusl;
	struct irqaction * action;
	unsigned long flags;
#ifdef CONFIG_SMP
	int x;
#endif

	spin_lock_irqsave(&irq_action_lock, flags);
	if (i < NR_IRQS) {
		sbusl = pil_to_sbus[i];
		if (!sbusl) {
	 		action = *(i + irq_action);
			if (!action) 
		        	goto out_unlock;
		} else {
			for (j = 0; j < nsbi; j++) {
				for (k = 0; k < 4; k++)
					if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
						goto found_it;
			}
			goto out_unlock;
		}
found_it:	seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
		seq_printf(p, "%10u ", kstat_irqs(i));
#else
		for_each_online_cpu(x)
			seq_printf(p, "%10u ",
			       kstat_cpu(cpu_logical_map(x)).irqs[i]);
#endif
		seq_printf(p, "%c %s",
			(action->flags & IRQF_DISABLED) ? '+' : ' ',
			action->name);
		action = action->next;
		for (;;) {
			for (; action; action = action->next) {
				seq_printf(p, ",%s %s",
					(action->flags & IRQF_DISABLED) ? " +" : "",
					action->name);
			}
			if (!sbusl) break;
			k++;
			if (k < 4)
				action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
			else {
				j++;
				if (j == nsbi) break;
				k = 0;
				action = sbus_actions [(j << 5) + (sbusl << 2)].action;
			}
		}
		seq_putc(p, '\n');
	}
out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
	return 0;
}

void sun4d_free_irq(unsigned int irq, void *dev_id)
{
	struct irqaction *action, **actionp;
	struct irqaction *tmp = NULL;
        unsigned long flags;

	spin_lock_irqsave(&irq_action_lock, flags);
	if (irq < 15)
		actionp = irq + irq_action;
	else
		actionp = &(sbus_actions[irq - (1 << 5)].action);
	action = *actionp;
	if (!action) {
		printk("Trying to free free IRQ%d\n",irq);
		goto out_unlock;
	}
	if (dev_id) {
		for (; action; action = action->next) {
			if (action->dev_id == dev_id)
				break;
			tmp = action;
		}
		if (!action) {
			printk("Trying to free free shared IRQ%d\n",irq);
			goto out_unlock;
		}
	} else if (action->flags & IRQF_SHARED) {
		printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
		goto out_unlock;
	}
	if (action->flags & SA_STATIC_ALLOC)
	{
		/* This interrupt is marked as specially allocated
		 * so it is a bad idea to free it.
		 */
		printk("Attempt to free statically allocated IRQ%d (%s)\n",
		       irq, action->name);
		goto out_unlock;
	}
	
	if (action && tmp)
		tmp->next = action->next;
	else
		*actionp = action->next;

	spin_unlock_irqrestore(&irq_action_lock, flags);

	synchronize_irq(irq);

	spin_lock_irqsave(&irq_action_lock, flags);

	kfree(action);

	if (!(*actionp))
		disable_irq(irq);

out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
}

extern void unexpected_irq(int, void *, struct pt_regs *);

void sun4d_handler_irq(int irq, struct pt_regs * regs)
{
	struct pt_regs *old_regs;
	struct irqaction * action;
	int cpu = smp_processor_id();
	/* SBUS IRQ level (1 - 7) */
	int sbusl = pil_to_sbus[irq];
	
	/* FIXME: Is this necessary?? */
	cc_get_ipen();
	
	cc_set_iclr(1 << irq);
	
	old_regs = set_irq_regs(regs);
	irq_enter();
	kstat_cpu(cpu).irqs[irq]++;
	if (!sbusl) {
		action = *(irq + irq_action);
		if (!action)
			unexpected_irq(irq, NULL, regs);
		do {
			action->handler(irq, action->dev_id);
			action = action->next;
		} while (action);
	} else {
		int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
		int sbino;
		struct sbus_action *actionp;
		unsigned mask, slot;
		int sbil = (sbusl << 2);
		
		bw_clear_intr_mask(sbusl, bus_mask);
		
		/* Loop for each pending SBI */
		for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
			if (bus_mask & 1) {
				mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
				mask &= (0xf << sbil);
				actionp = sbus_actions + (sbino << 5) + (sbil);
				/* Loop for each pending SBI slot */
				for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
					if (mask & slot) {
						mask &= ~slot;
						action = actionp->action;
						
						if (!action)
							unexpected_irq(irq, NULL, regs);
						do {
							action->handler(irq, action->dev_id);
							action = action->next;
						} while (action);
						release_sbi(SBI2DEVID(sbino), slot);
					}
			}
	}
	irq_exit();
	set_irq_regs(old_regs);
}

unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
{
	int sbusl = pil_to_sbus[irq];

	if (sbusl)
		return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
	else
		return irq;
}

unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
{
	if (sbint >= sizeof(sbus_to_pil)) {
		printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
		BUG();
	}
	return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
}

int sun4d_request_irq(unsigned int irq,
		irq_handler_t handler,
		unsigned long irqflags, const char * devname, void *dev_id)
{
	struct irqaction *action, *tmp = NULL, **actionp;
	unsigned long flags;
	int ret;
	
	if(irq > 14 && irq < (1 << 5)) {
		ret = -EINVAL;
		goto out;
	}

	if (!handler) {
		ret = -EINVAL;
		goto out;
	}

	spin_lock_irqsave(&irq_action_lock, flags);

	if (irq >= (1 << 5))
		actionp = &(sbus_actions[irq - (1 << 5)].action);
	else
		actionp = irq + irq_action;
	action = *actionp;
	
	if (action) {
		if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
			for (tmp = action; tmp->next; tmp = tmp->next);
		} else {
			ret = -EBUSY;
			goto out_unlock;
		}
		if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
			printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
			ret = -EBUSY;
			goto out_unlock;
		}
		action = NULL;		/* Or else! */
	}

	/* If this is flagged as statically allocated then we use our
	 * private struct which is never freed.
	 */
	if (irqflags & SA_STATIC_ALLOC) {
		if (static_irq_count < MAX_STATIC_ALLOC)
			action = &static_irqaction[static_irq_count++];
		else
			printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
	}
	
	if (action == NULL)
		action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
						     GFP_ATOMIC);
	
	if (!action) { 
		ret = -ENOMEM;
		goto out_unlock;
	}

	action->handler = handler;
	action->flags = irqflags;
	cpus_clear(action->mask);
	action->name = devname;
	action->next = NULL;
	action->dev_id = dev_id;

	if (tmp)
		tmp->next = action;
	else
		*actionp = action;
		
	enable_irq(irq);

	ret = 0;
out_unlock:
	spin_unlock_irqrestore(&irq_action_lock, flags);
out:
	return ret;
}

static void sun4d_disable_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;
#endif	
	
	if (irq < NR_IRQS) return;
#ifdef CONFIG_SMP
	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
#else		
	cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
#endif
}

static void sun4d_enable_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;
#endif	
	
	if (irq < NR_IRQS) return;
#ifdef CONFIG_SMP
	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
#else		
	cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
#endif
}

#ifdef CONFIG_SMP
static void sun4d_set_cpu_int(int cpu, int level)
{
	sun4d_send_ipi(cpu, level);
}

static void sun4d_clear_ipi(int cpu, int level)
{
}

static void sun4d_set_udt(int cpu)
{
}

/* Setup IRQ distribution scheme. */
void __init sun4d_distribute_irqs(void)
{
#ifdef DISTRIBUTE_IRQS
	struct sbus_bus *sbus;
	unsigned long sbus_serving_map;

	sbus_serving_map = cpu_present_map;
	for_each_sbus(sbus) {
		if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
			sbus_tid[sbus->board] = (sbus->board * 2 + 1);
		else if (cpu_present_map & (1 << (sbus->board * 2)))
			sbus_tid[sbus->board] = (sbus->board * 2);
		else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
			sbus_tid[sbus->board] = (sbus->board * 2 + 1);
		else
			sbus_tid[sbus->board] = 0xff;
		if (sbus_tid[sbus->board] != 0xff)
			sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
	}
	for_each_sbus(sbus)
		if (sbus_tid[sbus->board] == 0xff) {
			int i = 31;
				
			if (!sbus_serving_map)
				sbus_serving_map = cpu_present_map;
			while (!(sbus_serving_map & (1 << i)))
				i--;
			sbus_tid[sbus->board] = i;
			sbus_serving_map &= ~(1 << i);
		}
	for_each_sbus(sbus) {
		printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
		set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
	}
#else
	struct sbus_bus *sbus;
	int cpuid = cpu_logical_map(1);

	if (cpuid == -1)
		cpuid = cpu_logical_map(0);
	for_each_sbus(sbus) {
		sbus_tid[sbus->board] = cpuid;
		set_sbi_tid(sbus->devid, cpuid << 3);
	}
	printk("All sbus IRQs directed to CPU%d\n", cpuid);
#endif
}
#endif
 
static void sun4d_clear_clock_irq(void)
{
	volatile unsigned int clear_intr;
	clear_intr = sun4d_timers->l10_timer_limit;
}

static void sun4d_clear_profile_irq(int cpu)
{
	bw_get_prof_limit(cpu);
}

static void sun4d_load_profile_irq(int cpu, unsigned int limit)
{
	bw_set_prof_limit(cpu, limit);
}

static void __init sun4d_init_timers(irq_handler_t counter_fn)
{
	int irq;
	int cpu;
	struct resource r;
	int mid;

	/* Map the User Timer registers. */
	memset(&r, 0, sizeof(r));
#ifdef CONFIG_SMP
	r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
#else
	r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
#endif
	r.flags = 0xf;
	sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
	    PAGE_SIZE, "user timer");

	sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
	master_l10_counter = &sun4d_timers->l10_cur_count;
	master_l10_limit = &sun4d_timers->l10_timer_limit;

	irq = request_irq(TIMER_IRQ,
			  counter_fn,
			  (IRQF_DISABLED | SA_STATIC_ALLOC),
			  "timer", NULL);
	if (irq) {
		prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
		prom_halt();
	}
	
	/* Enable user timer free run for CPU 0 in BW */
	/* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */

	cpu = 0;
	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
		sun4d_load_profile_irq(mid >> 3, 0);
		cpu++;
	}
		
#ifdef CONFIG_SMP
	{
		unsigned long flags;
		extern unsigned long lvl14_save[4];
		struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
		extern unsigned int real_irq_entry[], smp4d_ticker[];
		extern unsigned int patchme_maybe_smp_msg[];

		/* Adjust so that we jump directly to smp4d_ticker */
		lvl14_save[2] += smp4d_ticker - real_irq_entry;

		/* For SMP we use the level 14 ticker, however the bootup code
		 * has copied the firmwares level 14 vector into boot cpu's
		 * trap table, we must fix this now or we get squashed.
		 */
		local_irq_save(flags);
		patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
		trap_table->inst_one = lvl14_save[0];
		trap_table->inst_two = lvl14_save[1];
		trap_table->inst_three = lvl14_save[2];
		trap_table->inst_four = lvl14_save[3];
		local_flush_cache_all();
		local_irq_restore(flags);
	}
#endif
}

void __init sun4d_init_sbi_irq(void)
{
	struct sbus_bus *sbus;
	unsigned mask;

	nsbi = 0;
	for_each_sbus(sbus)
		nsbi++;
	sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
	memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
	for_each_sbus(sbus) {
#ifdef CONFIG_SMP	
		extern unsigned char boot_cpu_id;
		
		set_sbi_tid(sbus->devid, boot_cpu_id << 3);
		sbus_tid[sbus->board] = boot_cpu_id;
#endif
		/* Get rid of pending irqs from PROM */
		mask = acquire_sbi(sbus->devid, 0xffffffff);
		if (mask) {
			printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
			release_sbi(sbus->devid, mask);
		}
	}
}

void __init sun4d_init_IRQ(void)
{
	local_irq_disable();

	BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
	sparc_init_timers = sun4d_init_timers;
#ifdef CONFIG_SMP
	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
	BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
#endif
	/* Cannot enable interrupts until OBP ticker is disabled. */
}
Commit	Line	Data
1da177e4 LT	1	/* $Id: sun4d_irq.c,v 1.29 2001/12/11 04:55:51 davem Exp $
	2	* arch/sparc/kernel/sun4d_irq.c:
	3	* SS1000/SC2000 interrupt handling.
	4	*
	5	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	6	* Heavily based on arch/sparc/kernel/irq.c.
	7	*/
	8
1da177e4 LT	9	#include <linux/errno.h>
	10	#include <linux/linkage.h>
	11	#include <linux/kernel_stat.h>
	12	#include <linux/signal.h>
	13	#include <linux/sched.h>
	14	#include <linux/ptrace.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/slab.h>
	17	#include <linux/random.h>
	18	#include <linux/init.h>
	19	#include <linux/smp.h>
	20	#include <linux/smp_lock.h>
	21	#include <linux/spinlock.h>
	22	#include <linux/seq_file.h>
	23
	24	#include <asm/ptrace.h>
	25	#include <asm/processor.h>
	26	#include <asm/system.h>
	27	#include <asm/psr.h>
	28	#include <asm/smp.h>
	29	#include <asm/vaddrs.h>
	30	#include <asm/timer.h>
	31	#include <asm/openprom.h>
	32	#include <asm/oplib.h>
	33	#include <asm/traps.h>
	34	#include <asm/irq.h>
	35	#include <asm/io.h>
	36	#include <asm/pgalloc.h>
	37	#include <asm/pgtable.h>
	38	#include <asm/sbus.h>
	39	#include <asm/sbi.h>
	40	#include <asm/cacheflush.h>
0d84438d	41	#include <asm/irq_regs.h>
1da177e4 LT	42
	43	/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
	44	/* #define DISTRIBUTE_IRQS */
	45
	46	struct sun4d_timer_regs *sun4d_timers;
	47	#define TIMER_IRQ 10
	48
	49	#define MAX_STATIC_ALLOC 4
	50	extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
	51	extern int static_irq_count;
	52	unsigned char cpu_leds[32];
	53	#ifdef CONFIG_SMP
	54	unsigned char sbus_tid[32];
	55	#endif
	56
a54123e2	57	static struct irqaction *irq_action[NR_IRQS];
1da177e4 LT	58	extern spinlock_t irq_action_lock;
	59
	60	struct sbus_action {
	61	struct irqaction *action;
	62	/* For SMP this needs to be extended */
	63	} *sbus_actions;
	64
	65	static int pil_to_sbus[] = {
	66	0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
	67	};
	68
	69	static int sbus_to_pil[] = {
	70	0, 2, 3, 5, 7, 9, 11, 13,
	71	};
	72
	73	static int nsbi;
	74	#ifdef CONFIG_SMP
	75	DEFINE_SPINLOCK(sun4d_imsk_lock);
	76	#endif
	77
	78	int show_sun4d_interrupts(struct seq_file p, void v)
	79	{
	80	int i = (loff_t ) v, j = 0, k = 0, sbusl;
	81	struct irqaction * action;
	82	unsigned long flags;
	83	#ifdef CONFIG_SMP
	84	int x;
	85	#endif
	86
	87	spin_lock_irqsave(&irq_action_lock, flags);
	88	if (i < NR_IRQS) {
	89	sbusl = pil_to_sbus[i];
	90	if (!sbusl) {
	91	action = *(i + irq_action);
	92	if (!action)
	93	goto out_unlock;
	94	} else {
	95	for (j = 0; j < nsbi; j++) {
	96	for (k = 0; k < 4; k++)
	97	if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
	98	goto found_it;
	99	}
	100	goto out_unlock;
	101	}
	102	found_it: seq_printf(p, "%3d: ", i);
	103	#ifndef CONFIG_SMP
	104	seq_printf(p, "%10u ", kstat_irqs(i));
	105	#else
394e3902 AM	106	for_each_online_cpu(x)
	107	seq_printf(p, "%10u ",
	108	kstat_cpu(cpu_logical_map(x)).irqs[i]);
1da177e4 LT	109	#endif
1da177e4 LT	110	seq_printf(p, "%c %s",
67413202	111	(action->flags & IRQF_DISABLED) ? '+' : ' ',
1da177e4 LT	112	action->name);
	113	action = action->next;
	114	for (;;) {
	115	for (; action; action = action->next) {
	116	seq_printf(p, ",%s %s",
67413202	117	(action->flags & IRQF_DISABLED) ? " +" : "",
1da177e4 LT	118	action->name);
	119	}
	120	if (!sbusl) break;
	121	k++;
	122	if (k < 4)
	123	action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
	124	else {
	125	j++;
	126	if (j == nsbi) break;
	127	k = 0;
	128	action = sbus_actions [(j << 5) + (sbusl << 2)].action;
	129	}
	130	}
	131	seq_putc(p, '\n');
	132	}
	133	out_unlock:
	134	spin_unlock_irqrestore(&irq_action_lock, flags);
	135	return 0;
	136	}
	137
	138	void sun4d_free_irq(unsigned int irq, void *dev_id)
	139	{
	140	struct irqaction action, *actionp;
	141	struct irqaction *tmp = NULL;
	142	unsigned long flags;
	143
	144	spin_lock_irqsave(&irq_action_lock, flags);
	145	if (irq < 15)
	146	actionp = irq + irq_action;
	147	else
	148	actionp = &(sbus_actions[irq - (1 << 5)].action);
	149	action = *actionp;
	150	if (!action) {
	151	printk("Trying to free free IRQ%d\n",irq);
	152	goto out_unlock;
	153	}
	154	if (dev_id) {
	155	for (; action; action = action->next) {
	156	if (action->dev_id == dev_id)
	157	break;
	158	tmp = action;
	159	}
	160	if (!action) {
	161	printk("Trying to free free shared IRQ%d\n",irq);
	162	goto out_unlock;
	163	}
67413202	164	} else if (action->flags & IRQF_SHARED) {
1da177e4 LT	165	printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
	166	goto out_unlock;
	167	}
	168	if (action->flags & SA_STATIC_ALLOC)
	169	{
	170	/* This interrupt is marked as specially allocated
	171	* so it is a bad idea to free it.
	172	*/
	173	printk("Attempt to free statically allocated IRQ%d (%s)\n",
	174	irq, action->name);
	175	goto out_unlock;
	176	}
	177
	178	if (action && tmp)
	179	tmp->next = action->next;
	180	else
	181	*actionp = action->next;
	182
	183	spin_unlock_irqrestore(&irq_action_lock, flags);
	184
	185	synchronize_irq(irq);
	186
	187	spin_lock_irqsave(&irq_action_lock, flags);
	188
	189	kfree(action);
	190
	191	if (!(*actionp))
	192	disable_irq(irq);
	193
	194	out_unlock:
	195	spin_unlock_irqrestore(&irq_action_lock, flags);
	196	}
	197
	198	extern void unexpected_irq(int, void , struct pt_regs );
	199
	200	void sun4d_handler_irq(int irq, struct pt_regs * regs)
	201	{
0d84438d	202	struct pt_regs *old_regs;
1da177e4 LT	203	struct irqaction * action;
	204	int cpu = smp_processor_id();
	205	/* SBUS IRQ level (1 - 7) */
	206	int sbusl = pil_to_sbus[irq];
	207
	208	/* FIXME: Is this necessary?? */
	209	cc_get_ipen();
	210
	211	cc_set_iclr(1 << irq);
	212
0d84438d	213	old_regs = set_irq_regs(regs);
1da177e4 LT	214	irq_enter();
	215	kstat_cpu(cpu).irqs[irq]++;
	216	if (!sbusl) {
	217	action = *(irq + irq_action);
	218	if (!action)
	219	unexpected_irq(irq, NULL, regs);
	220	do {
0d84438d	221	action->handler(irq, action->dev_id);
1da177e4 LT	222	action = action->next;
	223	} while (action);
	224	} else {
	225	int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
	226	int sbino;
	227	struct sbus_action *actionp;
	228	unsigned mask, slot;
	229	int sbil = (sbusl << 2);
	230
	231	bw_clear_intr_mask(sbusl, bus_mask);
	232
	233	/* Loop for each pending SBI */
	234	for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
	235	if (bus_mask & 1) {
	236	mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
	237	mask &= (0xf << sbil);
	238	actionp = sbus_actions + (sbino << 5) + (sbil);
	239	/* Loop for each pending SBI slot */
	240	for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
	241	if (mask & slot) {
	242	mask &= ~slot;
	243	action = actionp->action;
	244
	245	if (!action)
	246	unexpected_irq(irq, NULL, regs);
	247	do {
0d84438d	248	action->handler(irq, action->dev_id);
1da177e4 LT	249	action = action->next;
	250	} while (action);
	251	release_sbi(SBI2DEVID(sbino), slot);
	252	}
	253	}
	254	}
	255	irq_exit();
0d84438d	256	set_irq_regs(old_regs);
1da177e4 LT	257	}
	258
	259	unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
	260	{
	261	int sbusl = pil_to_sbus[irq];
	262
	263	if (sbusl)
	264	return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
	265	else
	266	return irq;
	267	}
	268
	269	unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
	270	{
	271	if (sbint >= sizeof(sbus_to_pil)) {
	272	printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
	273	BUG();
	274	}
	275	return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
	276	}
	277
	278	int sun4d_request_irq(unsigned int irq,
40220c1a	279	irq_handler_t handler,
1da177e4 LT	280	unsigned long irqflags, const char * devname, void *dev_id)
	281	{
	282	struct irqaction action, tmp = NULL, **actionp;
	283	unsigned long flags;
	284	int ret;
	285
	286	if(irq > 14 && irq < (1 << 5)) {
	287	ret = -EINVAL;
	288	goto out;
	289	}
	290
	291	if (!handler) {
	292	ret = -EINVAL;
	293	goto out;
	294	}
	295
	296	spin_lock_irqsave(&irq_action_lock, flags);
	297
	298	if (irq >= (1 << 5))
	299	actionp = &(sbus_actions[irq - (1 << 5)].action);
	300	else
	301	actionp = irq + irq_action;
	302	action = *actionp;
	303
	304	if (action) {
67413202	305	if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
1da177e4 LT	306	for (tmp = action; tmp->next; tmp = tmp->next);
	307	} else {
	308	ret = -EBUSY;
	309	goto out_unlock;
	310	}
67413202	311	if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
1da177e4 LT	312	printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
	313	ret = -EBUSY;
	314	goto out_unlock;
	315	}
	316	action = NULL; /* Or else! */
	317	}
	318
	319	/* If this is flagged as statically allocated then we use our
	320	* private struct which is never freed.
	321	*/
	322	if (irqflags & SA_STATIC_ALLOC) {
	323	if (static_irq_count < MAX_STATIC_ALLOC)
	324	action = &static_irqaction[static_irq_count++];
	325	else
	326	printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
	327	}
	328
	329	if (action == NULL)
	330	action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
	331	GFP_ATOMIC);
	332
	333	if (!action) {
	334	ret = -ENOMEM;
	335	goto out_unlock;
	336	}
	337
	338	action->handler = handler;
	339	action->flags = irqflags;
	340	cpus_clear(action->mask);
	341	action->name = devname;
	342	action->next = NULL;
	343	action->dev_id = dev_id;
	344
	345	if (tmp)
	346	tmp->next = action;
	347	else
	348	*actionp = action;
	349
	350	enable_irq(irq);
	351
	352	ret = 0;
	353	out_unlock:
	354	spin_unlock_irqrestore(&irq_action_lock, flags);
	355	out:
	356	return ret;
	357	}
	358
	359	static void sun4d_disable_irq(unsigned int irq)
	360	{
	361	#ifdef CONFIG_SMP
	362	int tid = sbus_tid[(irq >> 5) - 1];
	363	unsigned long flags;
	364	#endif
	365
	366	if (irq < NR_IRQS) return;
	367	#ifdef CONFIG_SMP
	368	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	369	cc_set_imsk_other(tid, cc_get_imsk_other(tid) \| (1 << sbus_to_pil[(irq >> 2) & 7]));
	370	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
	371	#else
	372	cc_set_imsk(cc_get_imsk() \| (1 << sbus_to_pil[(irq >> 2) & 7]));
	373	#endif
	374	}
	375
376	static void sun4d_enable_irq(unsigned int irq)
377	{
378	#ifdef CONFIG_SMP
379	int tid = sbus_tid[(irq >> 5) - 1];
380	unsigned long flags;
381	#endif
382
383	if (irq < NR_IRQS) return;
384	#ifdef CONFIG_SMP
385	spin_lock_irqsave(&sun4d_imsk_lock, flags);
386	cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
387	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
388	#else
389	cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
390	#endif
391	}
392
393	#ifdef CONFIG_SMP
394	static void sun4d_set_cpu_int(int cpu, int level)
395	{
396	sun4d_send_ipi(cpu, level);
397	}
398
399	static void sun4d_clear_ipi(int cpu, int level)
400	{
401	}
402
403	static void sun4d_set_udt(int cpu)
404	{
405	}
406
407	/* Setup IRQ distribution scheme. */
408	void __init sun4d_distribute_irqs(void)
409	{
410	#ifdef DISTRIBUTE_IRQS
411	struct sbus_bus *sbus;
412	unsigned long sbus_serving_map;
413
414	sbus_serving_map = cpu_present_map;
415	for_each_sbus(sbus) {
416	if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
417	sbus_tid[sbus->board] = (sbus->board * 2 + 1);
418	else if (cpu_present_map & (1 << (sbus->board * 2)))
419	sbus_tid[sbus->board] = (sbus->board * 2);
420	else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
421	sbus_tid[sbus->board] = (sbus->board * 2 + 1);
422	else
423	sbus_tid[sbus->board] = 0xff;
424	if (sbus_tid[sbus->board] != 0xff)
425	sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
426	}
427	for_each_sbus(sbus)
428	if (sbus_tid[sbus->board] == 0xff) {
429	int i = 31;
430
431	if (!sbus_serving_map)
432	sbus_serving_map = cpu_present_map;
433	while (!(sbus_serving_map & (1 << i)))
434	i--;
435	sbus_tid[sbus->board] = i;
436	sbus_serving_map &= ~(1 << i);
437	}
438	for_each_sbus(sbus) {
439	printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
440	set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
441	}
442	#else
443	struct sbus_bus *sbus;
444	int cpuid = cpu_logical_map(1);
445
446	if (cpuid == -1)
447	cpuid = cpu_logical_map(0);
448	for_each_sbus(sbus) {
449	sbus_tid[sbus->board] = cpuid;
450	set_sbi_tid(sbus->devid, cpuid << 3);
451	}
452	printk("All sbus IRQs directed to CPU%d\n", cpuid);
453	#endif
454	}
455	#endif
456
457	static void sun4d_clear_clock_irq(void)
458	{
459	volatile unsigned int clear_intr;
460	clear_intr = sun4d_timers->l10_timer_limit;
461	}
462
463	static void sun4d_clear_profile_irq(int cpu)
464	{
465	bw_get_prof_limit(cpu);
466	}
467
468	static void sun4d_load_profile_irq(int cpu, unsigned int limit)
469	{
470	bw_set_prof_limit(cpu, limit);
471	}
472
40220c1a	473	static void __init sun4d_init_timers(irq_handler_t counter_fn)
1da177e4 LT	474	{
	475	int irq;
	476	int cpu;
	477	struct resource r;
	478	int mid;
	479
	480	/* Map the User Timer registers. */
	481	memset(&r, 0, sizeof(r));
	482	#ifdef CONFIG_SMP
	483	r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
	484	#else
	485	r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
	486	#endif
	487	r.flags = 0xf;
	488	sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
	489	PAGE_SIZE, "user timer");
	490
	491	sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
	492	master_l10_counter = &sun4d_timers->l10_cur_count;
	493	master_l10_limit = &sun4d_timers->l10_timer_limit;
	494
	495	irq = request_irq(TIMER_IRQ,
	496	counter_fn,
67413202	497	(IRQF_DISABLED \| SA_STATIC_ALLOC),
1da177e4 LT	498	"timer", NULL);
	499	if (irq) {
	500	prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
	501	prom_halt();
	502	}
	503
	504	/* Enable user timer free run for CPU 0 in BW */
	505	/* bw_set_ctrl(0, bw_get_ctrl(0) \| BW_CTRL_USER_TIMER); */
	506
	507	cpu = 0;
	508	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
	509	sun4d_load_profile_irq(mid >> 3, 0);
	510	cpu++;
	511	}
	512
	513	#ifdef CONFIG_SMP
	514	{
	515	unsigned long flags;
	516	extern unsigned long lvl14_save[4];
	517	struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
	518	extern unsigned int real_irq_entry[], smp4d_ticker[];
	519	extern unsigned int patchme_maybe_smp_msg[];
	520
	521	/* Adjust so that we jump directly to smp4d_ticker */
	522	lvl14_save[2] += smp4d_ticker - real_irq_entry;
	523
	524	/* For SMP we use the level 14 ticker, however the bootup code
	525	* has copied the firmwares level 14 vector into boot cpu's
	526	* trap table, we must fix this now or we get squashed.
	527	*/
	528	local_irq_save(flags);
	529	patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
	530	trap_table->inst_one = lvl14_save[0];
	531	trap_table->inst_two = lvl14_save[1];
	532	trap_table->inst_three = lvl14_save[2];
	533	trap_table->inst_four = lvl14_save[3];
	534	local_flush_cache_all();
	535	local_irq_restore(flags);
	536	}
	537	#endif
	538	}
	539
	540	void __init sun4d_init_sbi_irq(void)
	541	{
	542	struct sbus_bus *sbus;
	543	unsigned mask;
	544
	545	nsbi = 0;
	546	for_each_sbus(sbus)
	547	nsbi++;
	548	sbus_actions = (struct sbus_action )kmalloc (nsbi 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
	549	memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
	550	for_each_sbus(sbus) {
	551	#ifdef CONFIG_SMP
	552	extern unsigned char boot_cpu_id;
	553
	554	set_sbi_tid(sbus->devid, boot_cpu_id << 3);
	555	sbus_tid[sbus->board] = boot_cpu_id;
	556	#endif
	557	/* Get rid of pending irqs from PROM */
	558	mask = acquire_sbi(sbus->devid, 0xffffffff);
	559	if (mask) {
	560	printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
	561	release_sbi(sbus->devid, mask);
562	}
563	}
564	}
565
1da177e4 LT	566	void __init sun4d_init_IRQ(void)
	567	{
	568	local_irq_disable();
	569
	570	BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
	571	BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
	572	BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
	573	BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
	574	BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
	575	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
1da177e4 LT	576	sparc_init_timers = sun4d_init_timers;
	577	#ifdef CONFIG_SMP
	578	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
	579	BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
	580	BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
	581	#endif
	582	/* Cannot enable interrupts until OBP ticker is disabled. */
	583	}