linux-imx

/*

 * SN Platform system controller communication support

 *

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

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

 * for more details.

 *

 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.

 */

​

/*

 * System controller event handler

 *

 * These routines deal with environmental events arriving from the

 * system controllers.

 */

​

#include <linux/interrupt.h>

#include <linux/sched/signal.h>

#include <linux/slab.h>

#include <asm/byteorder.h>

#include <asm/sn/sn_sal.h>

#include <asm/unaligned.h>

#include "snsc.h"

​

static struct subch_data_s *event_sd;

​

void scdrv_event(unsigned long);

DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);

​

/*

 * scdrv_event_interrupt

 *

 * Pull incoming environmental events off the physical link to the

 * system controller and put them in a temporary holding area in SAL.

 * Schedule scdrv_event() to move them along to their ultimate

 * destination.

 */

static irqreturn_t

scdrv_event_interrupt(int irq, void *subch_data)

{

    struct subch_data_s *sd = subch_data;

    unsigned long flags;

    int status;

​

    spin_lock_irqsave(&sd->sd_rlock, flags);

    status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);

​

    if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {

        tasklet_schedule(&sn_sysctl_event);

    }

    spin_unlock_irqrestore(&sd->sd_rlock, flags);

    return IRQ_HANDLED;

}

​

​

/*

 * scdrv_parse_event

 *

 * Break an event (as read from SAL) into useful pieces so we can decide

 * what to do with it.

 */

static int