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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/ia64/sn/kernel/sn2/timer_interrupt.c
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/*

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 *

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 *

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 * Copyright (c) 2005, 2006 Silicon Graphics, Inc.  All Rights Reserved.

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 * 

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 * This program is free software; you can redistribute it and/or modify it 

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 * under the terms of version 2 of the GNU General Public License 

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 * as published by the Free Software Foundation.

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 * 

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 * This program is distributed in the hope that it would be useful, but 

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 * WITHOUT ANY WARRANTY; without even the implied warranty of 

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 

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 * 

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 * Further, this software is distributed without any warranty that it is 

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 * free of the rightful claim of any third person regarding infringement 

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 * or the like.  Any license provided herein, whether implied or 

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 * otherwise, applies only to this software file.  Patent licenses, if 

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 * any, provided herein do not apply to combinations of this program with 

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 * other software, or any other product whatsoever.

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 * 

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 * You should have received a copy of the GNU General Public 

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 * License along with this program; if not, write the Free Software 

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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.

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 * 

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 * For further information regarding this notice, see: 

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 * 

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 * http://oss.sgi.com/projects/GenInfo/NoticeExplan

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 */

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#include <linux/interrupt.h>

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#include <asm/sn/pda.h>

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#include <asm/sn/leds.h>

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extern void sn_lb_int_war_check(void);

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extern irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);

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#define SN_LB_INT_WAR_INTERVAL 100

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void sn_timer_interrupt(int irq, void *dev_id)

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{

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	/* LED blinking */

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	if (!pda->hb_count--) {

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		pda->hb_count = HZ / 2;

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		set_led_bits(pda->hb_state ^=

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			     LED_CPU_HEARTBEAT, LED_CPU_HEARTBEAT);

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	}

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	if (is_shub1()) {

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		if (enable_shub_wars_1_1()) {

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			/* Bugfix code for SHUB 1.1 */

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			if (pda->pio_shub_war_cam_addr)

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				*pda->pio_shub_war_cam_addr = 0x8000000000000010UL;

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		}

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		if (pda->sn_lb_int_war_ticks == 0)

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			sn_lb_int_war_check();

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		pda->sn_lb_int_war_ticks++;

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		if (pda->sn_lb_int_war_ticks >= SN_LB_INT_WAR_INTERVAL)

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			pda->sn_lb_int_war_ticks = 0;

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	}

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}

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