linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *    Copyright IBM Corp. 1999, 2010

 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)

 *       Arnd Bergmann (arndb@de.ibm.com)

 *       Peter Oberparleiter <peter.oberparleiter@de.ibm.com>

 */

​

#include <linux/bug.h>

#include <linux/workqueue.h>

#include <linux/spinlock.h>

#include <linux/export.h>

#include <linux/sched.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/wait.h>

#include <linux/mutex.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include <asm/chpid.h>

#include <asm/sclp.h>

#include <asm/crw.h>

​

#include "cio.h"

#include "css.h"

#include "ioasm.h"

#include "cio_debug.h"

#include "chp.h"

​

#define to_channelpath(device) container_of(device, struct channel_path, dev)

#define CHP_INFO_UPDATE_INTERVAL    1*HZ

​

enum cfg_task_t {

    cfg_none,

    cfg_configure,

    cfg_deconfigure

};

​

/* Map for pending configure tasks. */

static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1];

static DEFINE_SPINLOCK(cfg_lock);

​

/* Map for channel-path status. */

static struct sclp_chp_info chp_info;

static DEFINE_MUTEX(info_lock);

​

/* Time after which channel-path status may be outdated. */

static unsigned long chp_info_expires;

​

static struct work_struct cfg_work;

​

/* Wait queue for configure completion events. */

static wait_queue_head_t cfg_wait_queue;

​

/* Set vary state for given chpid. */

static void set_chp_logically_online(struct chp_id chpid, int onoff)

{

    chpid_to_chp(chpid)->state = onoff;

}

​

/* On success return 0 if channel-path is varied offline, 1 if it is varied

 * online. Return -ENODEV if channel-path is not registered. */

int chp_get_status(struct chp_id chpid)

{

    return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);

}

​

/**

 * chp_get_sch_opm - return opm for subchannel

 * @sch: subchannel

 *

 * Calculate and return the operational path mask (opm) based on the chpids

 * used by the subchannel and the status of the associated channel-paths.

 */

u8 chp_get_sch_opm(struct subchannel *sch)

{

    struct chp_id chpid;

    int opm;

    int i;

​

    opm = 0;

    chp_id_init(&chpid);

    for (i = 0; i < 8; i++) {

        opm <<= 1;

        chpid.id = sch->schib.pmcw.chpid[i];

        if (chp_get_status(chpid) != 0)

            opm |= 1;

    }

    return opm;

}

EXPORT_SYMBOL_GPL(chp_get_sch_opm);

​