linux-imx

/*

 * 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) 2008 Silicon Graphics, Inc.  All Rights Reserved.

 */

​

/*

 * Cross Partition (XP) sn2-based functions.

 *

 *      Architecture specific implementation of common functions.

 */

​

#include <linux/module.h>

#include <linux/device.h>

#include <asm/sn/bte.h>

#include <asm/sn/sn_sal.h>

#include "xp.h"

​

/*

 * The export of xp_nofault_PIOR needs to happen here since it is defined

 * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is

 * defined here.

 */

EXPORT_SYMBOL_GPL(xp_nofault_PIOR);

​

u64 xp_nofault_PIOR_target;

EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);

​

/*

 * Register a nofault code region which performs a cross-partition PIO read.

 * If the PIO read times out, the MCA handler will consume the error and

 * return to a kernel-provided instruction to indicate an error. This PIO read

 * exists because it is guaranteed to timeout if the destination is down

 * (amo operations do not timeout on at least some CPUs on Shubs <= v1.2,

 * which unfortunately we have to work around).

 */

static enum xp_retval

xp_register_nofault_code_sn2(void)

{

    int ret;

    u64 func_addr;

    u64 err_func_addr;

​

    func_addr = *(u64 *)xp_nofault_PIOR;

    err_func_addr = *(u64 *)xp_error_PIOR;

    ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,

                       1, 1);

    if (ret != 0) {

        dev_err(xp, "can't register nofault code, error=%d\n", ret);

        return xpSalError;

    }

    /*

     * Setup the nofault PIO read target. (There is no special reason why

     * SH_IPI_ACCESS was selected.)

     */

    if (is_shub1())

        xp_nofault_PIOR_target = SH1_IPI_ACCESS;

    else if (is_shub2())

        xp_nofault_PIOR_target = SH2_IPI_ACCESS0;

​

    return xpSuccess;