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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/m68k/sun3/sun3ints.c
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 /*

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 * linux/arch/m68k/sun3/sun3ints.c -- Sun-3(x) Linux interrupt handling code

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file COPYING in the main directory of this archive

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 * for more details.

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 */

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#include <linux/types.h>

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#include <linux/kernel.h>

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#include <linux/sched.h>

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#include <linux/kernel_stat.h>

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#include <linux/interrupt.h>

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#include <asm/intersil.h>

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#include <asm/oplib.h>

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#include <asm/sun3ints.h>

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#include <asm/irq_regs.h>

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#include <linux/seq_file.h>

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#include "sun3.h"

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void sun3_disable_interrupts(void)

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{

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	sun3_disable_irq(0);

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}

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void sun3_enable_interrupts(void)

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{

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	sun3_enable_irq(0);

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}

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static unsigned char led_pattern[8] = {

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	(u8)~(0x80), (u8)~(0x01),

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	(u8)~(0x40), (u8)~(0x02),

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	(u8)~(0x20), (u8)~(0x04),

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	(u8)~(0x10), (u8)~(0x08)

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};

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volatile unsigned char* sun3_intreg;

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void sun3_enable_irq(unsigned int irq)

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{

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	*sun3_intreg |=  (1 << irq);

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}

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void sun3_disable_irq(unsigned int irq)

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{

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	*sun3_intreg &= ~(1 << irq);

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}

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static irqreturn_t sun3_int7(int irq, void *dev_id)

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{

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	unsigned int cnt;

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	cnt = kstat_irqs_cpu(irq, 0);

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	if (!(cnt % 2000))

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		sun3_leds(led_pattern[cnt % 16000 / 2000]);

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	return IRQ_HANDLED;

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}

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static irqreturn_t sun3_int5(int irq, void *dev_id)

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{

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	unsigned long flags;

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	unsigned int cnt;

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	local_irq_save(flags);

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#ifdef CONFIG_SUN3

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	intersil_clear();

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#endif

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	sun3_disable_irq(5);

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	sun3_enable_irq(5);

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#ifdef CONFIG_SUN3

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	intersil_clear();

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#endif

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	legacy_timer_tick(1);

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	cnt = kstat_irqs_cpu(irq, 0);

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	if (!(cnt % 20))

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		sun3_leds(led_pattern[cnt % 160 / 20]);

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	local_irq_restore(flags);

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	return IRQ_HANDLED;

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}

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static irqreturn_t sun3_vec255(int irq, void *dev_id)

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{

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	return IRQ_HANDLED;

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}

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void __init sun3_init_IRQ(void)

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{

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	*sun3_intreg = 1;

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	m68k_setup_user_interrupt(VEC_USER, 128);

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	if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "clock", NULL))

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		pr_err("Couldn't register %s interrupt\n", "int5");

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	if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "nmi", NULL))

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		pr_err("Couldn't register %s interrupt\n", "int7");

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	if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))

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		pr_err("Couldn't register %s interrupt\n", "vec255");

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}

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