[net-next-2.6.git] / arch / sparc / kernel / sun4d_irq.c

/*
 *  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/spinlock.h>
#include <linux/seq_file.h>
#include <linux/of.h>
#include <linux/of_device.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/sbi.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>

#include "kernel.h"
#include "irq.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 {
	u32	l10_timer_limit;
	u32	l10_cur_countx;
	u32	l10_limit_noclear;
	u32	ctrl;
	u32	l10_cur_count;
};

static struct sun4d_timer_regs __iomem *sun4d_timers;

#define TIMER_IRQ	10

#define MAX_STATIC_ALLOC	4
extern int static_irq_count;
static unsigned char sbus_tid[32];

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

static 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;

/* Exported for sun4d_smp.c */
DEFINE_SPINLOCK(sun4d_imsk_lock);

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 (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);
}

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 = kmalloc(sizeof(struct irqaction),
						     GFP_ATOMIC);
	
	if (!action) { 
		ret = -ENOMEM;
		goto out_unlock;
	}

	action->handler = handler;
	action->flags = irqflags;
	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)
{
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;
	
	if (irq < NR_IRQS)
		return;

	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);
}

static void sun4d_enable_irq(unsigned int irq)
{
	int tid = sbus_tid[(irq >> 5) - 1];
	unsigned long flags;
	
	if (irq < NR_IRQS)
		return;

	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);
}

#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)
{
	struct device_node *dp;

#ifdef DISTRIBUTE_IRQS
	cpumask_t sbus_serving_map;

	sbus_serving_map = cpu_present_map;
	for_each_node_by_name(dp, "sbi") {
		int board = of_getintprop_default(dp, "board#", 0);

		if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
			sbus_tid[board] = (board * 2 + 1);
		else if (cpu_isset(board * 2, cpu_present_map))
			sbus_tid[board] = (board * 2);
		else if (cpu_isset(board * 2 + 1, cpu_present_map))
			sbus_tid[board] = (board * 2 + 1);
		else
			sbus_tid[board] = 0xff;
		if (sbus_tid[board] != 0xff)
			cpu_clear(sbus_tid[board], sbus_serving_map);
	}
	for_each_node_by_name(dp, "sbi") {
		int board = of_getintprop_default(dp, "board#", 0);
		if (sbus_tid[board] == 0xff) {
			int i = 31;
				
			if (cpus_empty(sbus_serving_map))
				sbus_serving_map = cpu_present_map;
			while (cpu_isset(i, sbus_serving_map))
				i--;
			sbus_tid[board] = i;
			cpu_clear(i, sbus_serving_map);
		}
	}
	for_each_node_by_name(dp, "sbi") {
		int devid = of_getintprop_default(dp, "device-id", 0);
		int board = of_getintprop_default(dp, "board#", 0);
		printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
		set_sbi_tid(devid, sbus_tid[board] << 3);
	}
#else
	int cpuid = cpu_logical_map(1);

	if (cpuid == -1)
		cpuid = cpu_logical_map(0);
	for_each_node_by_name(dp, "sbi") {
		int devid = of_getintprop_default(dp, "device-id", 0);
		int board = of_getintprop_default(dp, "board#", 0);
		sbus_tid[board] = cpuid;
		set_sbi_tid(devid, cpuid << 3);
	}
	printk("All sbus IRQs directed to CPU%d\n", cpuid);
#endif
}
#endif
 
static void sun4d_clear_clock_irq(void)
{
	sbus_readl(&sun4d_timers->l10_timer_limit);
}

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

static void __init sun4d_load_profile_irqs(void)
{
	int cpu = 0, mid;

	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
		sun4d_load_profile_irq(mid >> 3, 0);
		cpu++;
	}
}

static void __init sun4d_fixup_trap_table(void)
{
#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 firmware's level 14 vector into the 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
}

static void __init sun4d_init_timers(irq_handler_t counter_fn)
{
	struct device_node *dp;
	struct resource res;
	const u32 *reg;
	int err;

	dp = of_find_node_by_name(NULL, "cpu-unit");
	if (!dp) {
		prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
		prom_halt();
	}

	/* Which cpu-unit we use is arbitrary, we can view the bootbus timer
	 * registers via any cpu's mapping.  The first 'reg' property is the
	 * bootbus.
	 */
	reg = of_get_property(dp, "reg", NULL);
	of_node_put(dp);
	if (!reg) {
		prom_printf("sun4d_init_timers: No reg property\n");
		prom_halt();
	}

	res.start = reg[1];
	res.end = reg[2] - 1;
	res.flags = reg[0] & 0xff;
	sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
				  sizeof(struct sun4d_timer_regs), "user timer");
	if (!sun4d_timers) {
		prom_printf("sun4d_init_timers: Can't map timer regs\n");
		prom_halt();
	}

	sbus_writel((((1000000/HZ) + 1) << 10), &sun4d_timers->l10_timer_limit);

	master_l10_counter = &sun4d_timers->l10_cur_count;

	err = request_irq(TIMER_IRQ, counter_fn,
			  (IRQF_DISABLED | SA_STATIC_ALLOC),
			  "timer", NULL);
	if (err) {
		prom_printf("sun4d_init_timers: request_irq() failed with %d\n", err);
		prom_halt();
	}
	sun4d_load_profile_irqs();
	sun4d_fixup_trap_table();
}

void __init sun4d_init_sbi_irq(void)
{
	struct device_node *dp;
	int target_cpu = 0;

#ifdef CONFIG_SMP
	target_cpu = boot_cpu_id;
#endif

	nsbi = 0;
	for_each_node_by_name(dp, "sbi")
		nsbi++;
	sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
	if (!sbus_actions) {
		prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
		prom_halt();
	}
	for_each_node_by_name(dp, "sbi") {
		int devid = of_getintprop_default(dp, "device-id", 0);
		int board = of_getintprop_default(dp, "board#", 0);
		unsigned int mask;

		set_sbi_tid(devid, target_cpu << 3);
		sbus_tid[board] = target_cpu;

		/* Get rid of pending irqs from PROM */
		mask = acquire_sbi(devid, 0xffffffff);
		if (mask) {
			printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
			release_sbi(devid, mask);
		}
	}
}

void __init sun4d_init_IRQ(void)
{
	local_irq_disable();

	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(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
88278ca2	1	/*
1da177e4 LT	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>
1da177e4 LT	20	#include <linux/spinlock.h>
1da177e4 LT	21	#include <linux/seq_file.h>
454eeb2d DM	22	#include <linux/of.h>
454eeb2d DM	23	#include <linux/of_device.h>
1da177e4 LT	24
	25	#include <asm/ptrace.h>
	26	#include <asm/processor.h>
	27	#include <asm/system.h>
	28	#include <asm/psr.h>
	29	#include <asm/smp.h>
	30	#include <asm/vaddrs.h>
	31	#include <asm/timer.h>
	32	#include <asm/openprom.h>
	33	#include <asm/oplib.h>
	34	#include <asm/traps.h>
	35	#include <asm/irq.h>
	36	#include <asm/io.h>
	37	#include <asm/pgalloc.h>
	38	#include <asm/pgtable.h>
1da177e4 LT	39	#include <asm/sbi.h>
1da177e4 LT	40	#include <asm/cacheflush.h>
0d84438d	41	#include <asm/irq_regs.h>
1da177e4	42
81265fd9	43	#include "kernel.h"
32231a66 AV	44	#include "irq.h"
32231a66 AV	45
1da177e4 LT	46	/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
	47	/* #define DISTRIBUTE_IRQS */
	48
f5f10857 DM	49	struct sun4d_timer_regs {
	50	u32 l10_timer_limit;
	51	u32 l10_cur_countx;
	52	u32 l10_limit_noclear;
	53	u32 ctrl;
	54	u32 l10_cur_count;
	55	};
	56
	57	static struct sun4d_timer_regs __iomem *sun4d_timers;
	58
1da177e4 LT	59	#define TIMER_IRQ 10
	60
	61	#define MAX_STATIC_ALLOC 4
1da177e4	62	extern int static_irq_count;
c61c65cd	63	static unsigned char sbus_tid[32];
1da177e4	64
a54123e2	65	static struct irqaction *irq_action[NR_IRQS];
1da177e4 LT	66	extern spinlock_t irq_action_lock;
1da177e4 LT	67
c61c65cd	68	static struct sbus_action {
1da177e4 LT	69	struct irqaction *action;
	70	/* For SMP this needs to be extended */
	71	} *sbus_actions;
	72
	73	static int pil_to_sbus[] = {
	74	0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
	75	};
	76
	77	static int sbus_to_pil[] = {
	78	0, 2, 3, 5, 7, 9, 11, 13,
	79	};
	80
	81	static int nsbi;
f8376e93 DM	82
f8376e93 DM	83	/* Exported for sun4d_smp.c */
1da177e4	84	DEFINE_SPINLOCK(sun4d_imsk_lock);
1da177e4 LT	85
	86	int show_sun4d_interrupts(struct seq_file p, void v)
	87	{
	88	int i = (loff_t ) v, j = 0, k = 0, sbusl;
	89	struct irqaction * action;
	90	unsigned long flags;
	91	#ifdef CONFIG_SMP
	92	int x;
	93	#endif
	94
	95	spin_lock_irqsave(&irq_action_lock, flags);
	96	if (i < NR_IRQS) {
	97	sbusl = pil_to_sbus[i];
	98	if (!sbusl) {
	99	action = *(i + irq_action);
	100	if (!action)
	101	goto out_unlock;
	102	} else {
	103	for (j = 0; j < nsbi; j++) {
	104	for (k = 0; k < 4; k++)
	105	if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
	106	goto found_it;
	107	}
	108	goto out_unlock;
	109	}
	110	found_it: seq_printf(p, "%3d: ", i);
	111	#ifndef CONFIG_SMP
	112	seq_printf(p, "%10u ", kstat_irqs(i));
	113	#else
394e3902 AM	114	for_each_online_cpu(x)
	115	seq_printf(p, "%10u ",
	116	kstat_cpu(cpu_logical_map(x)).irqs[i]);
1da177e4 LT	117	#endif
1da177e4 LT	118	seq_printf(p, "%c %s",
67413202	119	(action->flags & IRQF_DISABLED) ? '+' : ' ',
1da177e4 LT	120	action->name);
	121	action = action->next;
	122	for (;;) {
	123	for (; action; action = action->next) {
	124	seq_printf(p, ",%s %s",
67413202	125	(action->flags & IRQF_DISABLED) ? " +" : "",
1da177e4 LT	126	action->name);
	127	}
	128	if (!sbusl) break;
	129	k++;
	130	if (k < 4)
	131	action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
	132	else {
	133	j++;
	134	if (j == nsbi) break;
	135	k = 0;
	136	action = sbus_actions [(j << 5) + (sbusl << 2)].action;
	137	}
	138	}
	139	seq_putc(p, '\n');
	140	}
	141	out_unlock:
	142	spin_unlock_irqrestore(&irq_action_lock, flags);
	143	return 0;
	144	}
	145
	146	void sun4d_free_irq(unsigned int irq, void *dev_id)
	147	{
	148	struct irqaction action, *actionp;
	149	struct irqaction *tmp = NULL;
	150	unsigned long flags;
	151
	152	spin_lock_irqsave(&irq_action_lock, flags);
	153	if (irq < 15)
	154	actionp = irq + irq_action;
	155	else
	156	actionp = &(sbus_actions[irq - (1 << 5)].action);
	157	action = *actionp;
	158	if (!action) {
	159	printk("Trying to free free IRQ%d\n",irq);
	160	goto out_unlock;
	161	}
	162	if (dev_id) {
	163	for (; action; action = action->next) {
	164	if (action->dev_id == dev_id)
	165	break;
	166	tmp = action;
	167	}
	168	if (!action) {
	169	printk("Trying to free free shared IRQ%d\n",irq);
	170	goto out_unlock;
	171	}
67413202	172	} else if (action->flags & IRQF_SHARED) {
1da177e4 LT	173	printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
	174	goto out_unlock;
	175	}
	176	if (action->flags & SA_STATIC_ALLOC)
	177	{
	178	/* This interrupt is marked as specially allocated
	179	* so it is a bad idea to free it.
	180	*/
	181	printk("Attempt to free statically allocated IRQ%d (%s)\n",
	182	irq, action->name);
	183	goto out_unlock;
	184	}
	185
0d0659c7	186	if (tmp)
1da177e4 LT	187	tmp->next = action->next;
	188	else
	189	*actionp = action->next;
	190
	191	spin_unlock_irqrestore(&irq_action_lock, flags);
	192
	193	synchronize_irq(irq);
	194
	195	spin_lock_irqsave(&irq_action_lock, flags);
	196
	197	kfree(action);
	198
	199	if (!(*actionp))
0f516813	200	__disable_irq(irq);
1da177e4 LT	201
	202	out_unlock:
	203	spin_unlock_irqrestore(&irq_action_lock, flags);
	204	}
	205
	206	extern void unexpected_irq(int, void , struct pt_regs );
	207
	208	void sun4d_handler_irq(int irq, struct pt_regs * regs)
	209	{
0d84438d	210	struct pt_regs *old_regs;
1da177e4 LT	211	struct irqaction * action;
	212	int cpu = smp_processor_id();
	213	/* SBUS IRQ level (1 - 7) */
	214	int sbusl = pil_to_sbus[irq];
	215
	216	/* FIXME: Is this necessary?? */
	217	cc_get_ipen();
	218
	219	cc_set_iclr(1 << irq);
	220
0d84438d	221	old_regs = set_irq_regs(regs);
1da177e4 LT	222	irq_enter();
	223	kstat_cpu(cpu).irqs[irq]++;
	224	if (!sbusl) {
	225	action = *(irq + irq_action);
	226	if (!action)
	227	unexpected_irq(irq, NULL, regs);
	228	do {
0d84438d	229	action->handler(irq, action->dev_id);
1da177e4 LT	230	action = action->next;
	231	} while (action);
	232	} else {
	233	int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
	234	int sbino;
	235	struct sbus_action *actionp;
	236	unsigned mask, slot;
	237	int sbil = (sbusl << 2);
	238
	239	bw_clear_intr_mask(sbusl, bus_mask);
	240
	241	/* Loop for each pending SBI */
	242	for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
	243	if (bus_mask & 1) {
	244	mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
	245	mask &= (0xf << sbil);
	246	actionp = sbus_actions + (sbino << 5) + (sbil);
	247	/* Loop for each pending SBI slot */
	248	for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
	249	if (mask & slot) {
	250	mask &= ~slot;
	251	action = actionp->action;
	252
	253	if (!action)
	254	unexpected_irq(irq, NULL, regs);
	255	do {
0d84438d	256	action->handler(irq, action->dev_id);
1da177e4 LT	257	action = action->next;
	258	} while (action);
	259	release_sbi(SBI2DEVID(sbino), slot);
	260	}
	261	}
	262	}
	263	irq_exit();
0d84438d	264	set_irq_regs(old_regs);
1da177e4 LT	265	}
1da177e4 LT	266
1da177e4	267	int sun4d_request_irq(unsigned int irq,
40220c1a	268	irq_handler_t handler,
1da177e4 LT	269	unsigned long irqflags, const char * devname, void *dev_id)
	270	{
	271	struct irqaction action, tmp = NULL, **actionp;
	272	unsigned long flags;
	273	int ret;
	274
	275	if(irq > 14 && irq < (1 << 5)) {
	276	ret = -EINVAL;
	277	goto out;
	278	}
	279
	280	if (!handler) {
	281	ret = -EINVAL;
	282	goto out;
	283	}
	284
	285	spin_lock_irqsave(&irq_action_lock, flags);
	286
	287	if (irq >= (1 << 5))
	288	actionp = &(sbus_actions[irq - (1 << 5)].action);
	289	else
	290	actionp = irq + irq_action;
	291	action = *actionp;
	292
	293	if (action) {
67413202	294	if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
1da177e4 LT	295	for (tmp = action; tmp->next; tmp = tmp->next);
	296	} else {
	297	ret = -EBUSY;
	298	goto out_unlock;
	299	}
67413202	300	if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
1da177e4 LT	301	printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
	302	ret = -EBUSY;
	303	goto out_unlock;
	304	}
	305	action = NULL; /* Or else! */
	306	}
	307
	308	/* If this is flagged as statically allocated then we use our
	309	* private struct which is never freed.
	310	*/
	311	if (irqflags & SA_STATIC_ALLOC) {
	312	if (static_irq_count < MAX_STATIC_ALLOC)
	313	action = &static_irqaction[static_irq_count++];
	314	else
	315	printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
	316	}
	317
	318	if (action == NULL)
5cbded58	319	action = kmalloc(sizeof(struct irqaction),
1da177e4 LT	320	GFP_ATOMIC);
	321
	322	if (!action) {
	323	ret = -ENOMEM;
	324	goto out_unlock;
	325	}
	326
	327	action->handler = handler;
	328	action->flags = irqflags;
1da177e4 LT	329	action->name = devname;
	330	action->next = NULL;
	331	action->dev_id = dev_id;
	332
	333	if (tmp)
	334	tmp->next = action;
	335	else
	336	*actionp = action;
	337
0f516813	338	__enable_irq(irq);
1da177e4 LT	339
	340	ret = 0;
	341	out_unlock:
	342	spin_unlock_irqrestore(&irq_action_lock, flags);
	343	out:
	344	return ret;
	345	}
	346
	347	static void sun4d_disable_irq(unsigned int irq)
	348	{
1da177e4 LT	349	int tid = sbus_tid[(irq >> 5) - 1];
1da177e4 LT	350	unsigned long flags;
1da177e4	351
f8376e93 DM	352	if (irq < NR_IRQS)
	353	return;
	354
1da177e4 LT	355	spin_lock_irqsave(&sun4d_imsk_lock, flags);
	356	cc_set_imsk_other(tid, cc_get_imsk_other(tid) \| (1 << sbus_to_pil[(irq >> 2) & 7]));
	357	spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
1da177e4 LT	358	}
	359
	360	static void sun4d_enable_irq(unsigned int irq)
	361	{
1da177e4 LT	362	int tid = sbus_tid[(irq >> 5) - 1];
1da177e4 LT	363	unsigned long flags;
1da177e4	364
f8376e93 DM	365	if (irq < NR_IRQS)
	366	return;
	367
1da177e4 LT	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);
1da177e4 LT	371	}
	372
	373	#ifdef CONFIG_SMP
	374	static void sun4d_set_cpu_int(int cpu, int level)
	375	{
	376	sun4d_send_ipi(cpu, level);
	377	}
	378
	379	static void sun4d_clear_ipi(int cpu, int level)
	380	{
	381	}
	382
	383	static void sun4d_set_udt(int cpu)
	384	{
	385	}
	386
	387	/* Setup IRQ distribution scheme. */
	388	void __init sun4d_distribute_irqs(void)
	389	{
71d37211 DM	390	struct device_node *dp;
71d37211 DM	391
1da177e4	392	#ifdef DISTRIBUTE_IRQS
71d37211	393	cpumask_t sbus_serving_map;
1da177e4 LT	394
1da177e4 LT	395	sbus_serving_map = cpu_present_map;
71d37211 DM	396	for_each_node_by_name(dp, "sbi") {
	397	int board = of_getintprop_default(dp, "board#", 0);
	398
	399	if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
	400	sbus_tid[board] = (board * 2 + 1);
	401	else if (cpu_isset(board * 2, cpu_present_map))
	402	sbus_tid[board] = (board * 2);
	403	else if (cpu_isset(board * 2 + 1, cpu_present_map))
	404	sbus_tid[board] = (board * 2 + 1);
1da177e4	405	else
71d37211 DM	406	sbus_tid[board] = 0xff;
	407	if (sbus_tid[board] != 0xff)
	408	cpu_clear(sbus_tid[board], sbus_serving_map);
1da177e4	409	}
71d37211 DM	410	for_each_node_by_name(dp, "sbi") {
	411	int board = of_getintprop_default(dp, "board#", 0);
	412	if (sbus_tid[board] == 0xff) {
1da177e4 LT	413	int i = 31;
1da177e4 LT	414
71d37211	415	if (cpus_empty(sbus_serving_map))
1da177e4	416	sbus_serving_map = cpu_present_map;
71d37211	417	while (cpu_isset(i, sbus_serving_map))
1da177e4	418	i--;
71d37211 DM	419	sbus_tid[board] = i;
71d37211 DM	420	cpu_clear(i, sbus_serving_map);
1da177e4	421	}
71d37211 DM	422	}
	423	for_each_node_by_name(dp, "sbi") {
	424	int devid = of_getintprop_default(dp, "device-id", 0);
	425	int board = of_getintprop_default(dp, "board#", 0);
	426	printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
	427	set_sbi_tid(devid, sbus_tid[board] << 3);
1da177e4 LT	428	}
1da177e4 LT	429	#else
1da177e4 LT	430	int cpuid = cpu_logical_map(1);
	431
	432	if (cpuid == -1)
	433	cpuid = cpu_logical_map(0);
71d37211 DM	434	for_each_node_by_name(dp, "sbi") {
	435	int devid = of_getintprop_default(dp, "device-id", 0);
	436	int board = of_getintprop_default(dp, "board#", 0);
	437	sbus_tid[board] = cpuid;
	438	set_sbi_tid(devid, cpuid << 3);
1da177e4 LT	439	}
	440	printk("All sbus IRQs directed to CPU%d\n", cpuid);
	441	#endif
	442	}
	443	#endif
	444
	445	static void sun4d_clear_clock_irq(void)
	446	{
f5f10857	447	sbus_readl(&sun4d_timers->l10_timer_limit);
1da177e4 LT	448	}
1da177e4 LT	449
1da177e4 LT	450	static void sun4d_load_profile_irq(int cpu, unsigned int limit)
	451	{
	452	bw_set_prof_limit(cpu, limit);
	453	}
	454
f5f10857	455	static void __init sun4d_load_profile_irqs(void)
1da177e4	456	{
f5f10857	457	int cpu = 0, mid;
1da177e4	458
f5f10857 DM	459	while (!cpu_find_by_instance(cpu, NULL, &mid)) {
	460	sun4d_load_profile_irq(mid >> 3, 0);
	461	cpu++;
	462	}
	463	}
	464
	465	static void __init sun4d_fixup_trap_table(void)
	466	{
1da177e4	467	#ifdef CONFIG_SMP
f5f10857 DM	468	unsigned long flags;
	469	extern unsigned long lvl14_save[4];
	470	struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
	471	extern unsigned int real_irq_entry[], smp4d_ticker[];
	472	extern unsigned int patchme_maybe_smp_msg[];
	473
	474	/* Adjust so that we jump directly to smp4d_ticker */
	475	lvl14_save[2] += smp4d_ticker - real_irq_entry;
	476
	477	/* For SMP we use the level 14 ticker, however the bootup code
	478	* has copied the firmware's level 14 vector into the boot cpu's
	479	* trap table, we must fix this now or we get squashed.
	480	*/
	481	local_irq_save(flags);
	482	patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
	483	trap_table->inst_one = lvl14_save[0];
	484	trap_table->inst_two = lvl14_save[1];
	485	trap_table->inst_three = lvl14_save[2];
	486	trap_table->inst_four = lvl14_save[3];
	487	local_flush_cache_all();
	488	local_irq_restore(flags);
1da177e4	489	#endif
f5f10857 DM	490	}
	491
	492	static void __init sun4d_init_timers(irq_handler_t counter_fn)
	493	{
	494	struct device_node *dp;
	495	struct resource res;
	496	const u32 *reg;
	497	int err;
	498
	499	dp = of_find_node_by_name(NULL, "cpu-unit");
	500	if (!dp) {
	501	prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
	502	prom_halt();
	503	}
	504
	505	/* Which cpu-unit we use is arbitrary, we can view the bootbus timer
	506	* registers via any cpu's mapping. The first 'reg' property is the
	507	* bootbus.
	508	*/
	509	reg = of_get_property(dp, "reg", NULL);
c2e27c35	510	of_node_put(dp);
f5f10857 DM	511	if (!reg) {
	512	prom_printf("sun4d_init_timers: No reg property\n");
	513	prom_halt();
	514	}
	515
	516	res.start = reg[1];
	517	res.end = reg[2] - 1;
	518	res.flags = reg[0] & 0xff;
	519	sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
	520	sizeof(struct sun4d_timer_regs), "user timer");
	521	if (!sun4d_timers) {
	522	prom_printf("sun4d_init_timers: Can't map timer regs\n");
	523	prom_halt();
	524	}
	525
	526	sbus_writel((((1000000/HZ) + 1) << 10), &sun4d_timers->l10_timer_limit);
1da177e4	527
1da177e4	528	master_l10_counter = &sun4d_timers->l10_cur_count;
1da177e4	529
f5f10857	530	err = request_irq(TIMER_IRQ, counter_fn,
67413202	531	(IRQF_DISABLED \| SA_STATIC_ALLOC),
1da177e4	532	"timer", NULL);
f5f10857 DM	533	if (err) {
f5f10857 DM	534	prom_printf("sun4d_init_timers: request_irq() failed with %d\n", err);
1da177e4 LT	535	prom_halt();
1da177e4 LT	536	}
f5f10857 DM	537	sun4d_load_profile_irqs();
f5f10857 DM	538	sun4d_fixup_trap_table();
1da177e4 LT	539	}
	540
	541	void __init sun4d_init_sbi_irq(void)
	542	{
71d37211	543	struct device_node *dp;
f8376e93 DM	544	int target_cpu = 0;
	545
	546	#ifdef CONFIG_SMP
	547	target_cpu = boot_cpu_id;
	548	#endif
1da177e4 LT	549
1da177e4 LT	550	nsbi = 0;
71d37211	551	for_each_node_by_name(dp, "sbi")
1da177e4	552	nsbi++;
c80892d1	553	sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
d4accd60 DM	554	if (!sbus_actions) {
	555	prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
	556	prom_halt();
	557	}
71d37211 DM	558	for_each_node_by_name(dp, "sbi") {
	559	int devid = of_getintprop_default(dp, "device-id", 0);
	560	int board = of_getintprop_default(dp, "board#", 0);
	561	unsigned int mask;
	562
f8376e93 DM	563	set_sbi_tid(devid, target_cpu << 3);
	564	sbus_tid[board] = target_cpu;
	565
1da177e4	566	/* Get rid of pending irqs from PROM */
71d37211	567	mask = acquire_sbi(devid, 0xffffffff);
1da177e4	568	if (mask) {
71d37211 DM	569	printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
71d37211 DM	570	release_sbi(devid, mask);
1da177e4 LT	571	}
	572	}
	573	}
	574
1da177e4 LT	575	void __init sun4d_init_IRQ(void)
	576	{
	577	local_irq_disable();
	578
1da177e4 LT	579	BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
	580	BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
	581	BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
1da177e4	582	BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
1da177e4 LT	583	sparc_init_timers = sun4d_init_timers;
	584	#ifdef CONFIG_SMP
	585	BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
	586	BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
	587	BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
	588	#endif
	589	/* Cannot enable interrupts until OBP ticker is disabled. */
	590	}