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 communication driver

 *

 * This driver allows a user process to communicate with the system

 * controller (a.k.a. "IRouter") network in an SGI SN system.

 */

​

#include <linux/interrupt.h>

#include <linux/sched/signal.h>

#include <linux/device.h>

#include <linux/poll.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/mutex.h>

#include <asm/sn/io.h>

#include <asm/sn/sn_sal.h>

#include <asm/sn/module.h>

#include <asm/sn/geo.h>

#include <asm/sn/nodepda.h>

#include "snsc.h"

​

#define SYSCTL_BASENAME "snsc"

​

#define SCDRV_BUFSZ 2048

#define SCDRV_TIMEOUT   1000

​

static DEFINE_MUTEX(scdrv_mutex);

static irqreturn_t

scdrv_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);

    spin_lock(&sd->sd_wlock);

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

​

    if (status > 0) {

        if (status & SAL_IROUTER_INTR_RECV) {

            wake_up(&sd->sd_rq);

        }

        if (status & SAL_IROUTER_INTR_XMIT) {

            ia64_sn_irtr_intr_disable

                (sd->sd_nasid, sd->sd_subch,

                 SAL_IROUTER_INTR_XMIT);

            wake_up(&sd->sd_wq);

        }

    }

    spin_unlock(&sd->sd_wlock);

    spin_unlock_irqrestore(&sd->sd_rlock, flags);

    return IRQ_HANDLED;

}