leon_kernel.c 11.5 KB
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/*
 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
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#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/prom.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
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#include <asm/traps.h>
#include <asm/cacheflush.h>
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#include <asm/smp.h>
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#include "prom.h"
#include "irq.h"

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struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
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int leondebug_irq_disable;
int leon_debug_irqout;
static int dummy_master_l10_counter;
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unsigned long amba_system_id;
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static DEFINE_SPINLOCK(leon_irq_lock);
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unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
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unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
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int leon3_ticker_irq; /* Timer ticker IRQ */
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unsigned int sparc_leon_eirq;
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#define LEON_IMASK (&leon3_irqctrl_regs->mask[0])
#define LEON_IACK (&leon3_irqctrl_regs->iclear)
#define LEON_DO_ACK_HW 1
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/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
 * been (automatically) ACKed when the CPU takes the trap.
 */
static inline unsigned int leon_eirq_get(int cpu)
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{
	return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
}

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/* Handle one or multiple IRQs from the extended interrupt controller */
static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
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{
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	unsigned int eirq;
	int cpu = hard_smp_processor_id();

	eirq = leon_eirq_get(cpu);
	if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
		generic_handle_irq(irq_map[eirq]->irq);
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}

/* The extended IRQ controller has been found, this function registers it */
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void leon_eirq_setup(unsigned int eirq)
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{
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	unsigned long mask, oldmask;
	unsigned int veirq;
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	if (eirq < 1 || eirq > 0xf) {
		printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
		return;
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	}

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	veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);

	/*
	 * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
	 * controller have a mask-bit of their own, so this is safe.
	 */
	irq_link(veirq);
	mask = 1 << eirq;
	oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK);
	LEON3_BYPASS_STORE_PA(LEON_IMASK, (oldmask | mask));
	sparc_leon_eirq = eirq;
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}

static inline unsigned long get_irqmask(unsigned int irq)
{
	unsigned long mask;

	if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
	    || ((irq > 0x1f) && sparc_leon_eirq)) {
		printk(KERN_ERR
		       "leon_get_irqmask: false irq number: %d\n", irq);
		mask = 0;
	} else {
		mask = LEON_HARD_INT(irq);
	}
	return mask;
}

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static void leon_unmask_irq(struct irq_data *data)
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{
	unsigned long mask, flags;
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	mask = (unsigned long)data->chip_data;
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	spin_lock_irqsave(&leon_irq_lock, flags);
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	LEON3_BYPASS_STORE_PA(LEON_IMASK,
			      (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
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	spin_unlock_irqrestore(&leon_irq_lock, flags);
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}

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static void leon_mask_irq(struct irq_data *data)
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{
	unsigned long mask, flags;
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	mask = (unsigned long)data->chip_data;
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	spin_lock_irqsave(&leon_irq_lock, flags);
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	LEON3_BYPASS_STORE_PA(LEON_IMASK,
			      (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
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	spin_unlock_irqrestore(&leon_irq_lock, flags);
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}

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static unsigned int leon_startup_irq(struct irq_data *data)
{
	irq_link(data->irq);
	leon_unmask_irq(data);
	return 0;
}

static void leon_shutdown_irq(struct irq_data *data)
{
	leon_mask_irq(data);
	irq_unlink(data->irq);
}

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/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
static void leon_eoi_irq(struct irq_data *data)
{
	unsigned long mask = (unsigned long)data->chip_data;

	if (mask & LEON_DO_ACK_HW)
		LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
}

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static struct irq_chip leon_irq = {
	.name		= "leon",
	.irq_startup	= leon_startup_irq,
	.irq_shutdown	= leon_shutdown_irq,
	.irq_mask	= leon_mask_irq,
	.irq_unmask	= leon_unmask_irq,
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	.irq_eoi	= leon_eoi_irq,
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};

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/*
 * Build a LEON IRQ for the edge triggered LEON IRQ controller:
 *  Edge (normal) IRQ           - handle_simple_irq, ack=DONT-CARE, never ack
 *  Level IRQ (PCI|Level-GPIO)  - handle_fasteoi_irq, ack=1, ack after ISR
 *  Per-CPU Edge                - handle_percpu_irq, ack=0
 */
unsigned int leon_build_device_irq(unsigned int real_irq,
				    irq_flow_handler_t flow_handler,
				    const char *name, int do_ack)
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{
	unsigned int irq;
	unsigned long mask;

	irq = 0;
	mask = get_irqmask(real_irq);
	if (mask == 0)
		goto out;

	irq = irq_alloc(real_irq, real_irq);
	if (irq == 0)
		goto out;

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	if (do_ack)
		mask |= LEON_DO_ACK_HW;

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	irq_set_chip_and_handler_name(irq, &leon_irq,
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				      flow_handler, name);
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	irq_set_chip_data(irq, (void *)mask);

out:
	return irq;
}

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static unsigned int _leon_build_device_irq(struct platform_device *op,
					   unsigned int real_irq)
{
	return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
}

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void __init leon_init_timers(irq_handler_t counter_fn)
{
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	int irq, eirq;
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	struct device_node *rootnp, *np, *nnp;
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	struct property *pp;
	int len;
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	int cpu, icsel;
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	int ampopts;
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	int err;
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	leondebug_irq_disable = 0;
	leon_debug_irqout = 0;
	master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
	dummy_master_l10_counter = 0;

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	rootnp = of_find_node_by_path("/ambapp0");
	if (!rootnp)
		goto bad;
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	/* Find System ID: GRLIB build ID and optional CHIP ID */
	pp = of_find_property(rootnp, "systemid", &len);
	if (pp)
		amba_system_id = *(unsigned long *)pp->value;

	/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
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	np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
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	if (!np) {
		np = of_find_node_by_name(rootnp, "01_00d");
		if (!np)
			goto bad;
	}
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	pp = of_find_property(np, "reg", &len);
	if (!pp)
		goto bad;
	leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;

	/* Find GPTIMER Timer Registers base address otherwise bail out. */
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	nnp = rootnp;
	do {
		np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
		if (!np) {
			np = of_find_node_by_name(nnp, "01_011");
			if (!np)
				goto bad;
		}

		ampopts = 0;
		pp = of_find_property(np, "ampopts", &len);
		if (pp) {
			ampopts = *(int *)pp->value;
			if (ampopts == 0) {
				/* Skip this instance, resource already
				 * allocated by other OS */
				nnp = np;
				continue;
			}
		}

		/* Select Timer-Instance on Timer Core. Default is zero */
		leon3_gptimer_idx = ampopts & 0x7;

		pp = of_find_property(np, "reg", &len);
		if (pp)
			leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
						pp->value;
		pp = of_find_property(np, "interrupts", &len);
		if (pp)
			leon3_gptimer_irq = *(unsigned int *)pp->value;
	} while (0);
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	if (leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq) {
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		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
			(((1000000 / HZ) - 1)));
		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
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#ifdef CONFIG_SMP
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		leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
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		if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
		      (1<<LEON3_GPTIMER_SEPIRQ))) {
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			prom_printf("irq timer not configured with separate irqs\n");
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			BUG();
		}

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		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
			(((1000000/HZ) - 1)));
		LEON3_BYPASS_STORE_PA(
			&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 0);
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# endif

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		/*
		 * The IRQ controller may (if implemented) consist of multiple
		 * IRQ controllers, each mapped on a 4Kb boundary.
		 * Each CPU may be routed to different IRQCTRLs, however
		 * we assume that all CPUs (in SMP system) is routed to the
		 * same IRQ Controller, and for non-SMP only one IRQCTRL is
		 * accessed anyway.
		 * In AMP systems, Linux must run on CPU0 for the time being.
		 */
		cpu = sparc_leon3_cpuid();
		icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
		icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
		leon3_irqctrl_regs += icsel;
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		/* Probe extended IRQ controller */
		eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
			>> 16) & 0xf;
		if (eirq != 0)
			leon_eirq_setup(eirq);
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	} else {
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		goto bad;
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	}

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	irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
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	err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
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	if (err) {
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		printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
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		       irq);
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		prom_halt();
	}

	if (leon3_gptimer_regs) {
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		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
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				      LEON3_GPTIMER_EN |
				      LEON3_GPTIMER_RL |
				      LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
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#ifdef CONFIG_SMP
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		/* Install per-cpu IRQ handler for broadcasted ticker */
		irq = leon_build_device_irq(leon3_ticker_irq,
						handle_percpu_irq, "per-cpu",
						0);
		err = request_irq(irq, leon_percpu_timer_interrupt,
					IRQF_PERCPU | IRQF_TIMER, "ticker",
					NULL);
		if (err) {
			printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
			prom_halt();
		}

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		LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
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				      LEON3_GPTIMER_EN |
				      LEON3_GPTIMER_RL |
				      LEON3_GPTIMER_LD |
				      LEON3_GPTIMER_IRQEN);
#endif

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	}
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	return;
bad:
	printk(KERN_ERR "No Timer/irqctrl found\n");
	BUG();
	return;
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}

void leon_clear_clock_irq(void)
{
}

void leon_load_profile_irq(int cpu, unsigned int limit)
{
	BUG();
}




void __init leon_trans_init(struct device_node *dp)
{
	if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
		struct property *p;
		p = of_find_property(dp, "mid", (void *)0);
		if (p) {
			int mid;
			dp->name = prom_early_alloc(5 + 1);
			memcpy(&mid, p->value, p->length);
			sprintf((char *)dp->name, "cpu%.2d", mid);
		}
	}
}

void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;

void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
{
	if (prom_amba_init &&
	    strcmp(dp->type, "ambapp") == 0 &&
	    strcmp(dp->name, "ambapp0") == 0) {
		prom_amba_init(dp, nextp);
	}
}

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#ifdef CONFIG_SMP

void leon_set_cpu_int(int cpu, int level)
{
	unsigned long mask;
	mask = get_irqmask(level);
	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
}

static void leon_clear_ipi(int cpu, int level)
{
	unsigned long mask;
	mask = get_irqmask(level);
	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
}

static void leon_set_udt(int cpu)
{
}

void leon_clear_profile_irq(int cpu)
{
}

void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
{
	unsigned long mask, flags, *addr;
	mask = get_irqmask(irq_nr);
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	spin_lock_irqsave(&leon_irq_lock, flags);
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	addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
	LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
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	spin_unlock_irqrestore(&leon_irq_lock, flags);
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}

#endif

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void __init leon_init_IRQ(void)
{
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	sparc_irq_config.init_timers      = leon_init_timers;
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	sparc_irq_config.build_device_irq = _leon_build_device_irq;
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	BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
			BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
			BTFIXUPCALL_NOP);

#ifdef CONFIG_SMP
	BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
#endif

}

void __init leon_init(void)
{
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	of_pdt_build_more = &leon_node_init;
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}