source: rtems-libbsd/linux/drivers/soc/fsl/qbman/qman_driver.c @ 28ee86a

#include <machine/rtems-bsd-kernel-space.h>

#include <rtems/bsd/local/opt_dpaa.h>

/* Copyright 2013 - 2015 Freescale Semiconductor, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "qman_priv.h"

#include <linux/time.h>

static int __init early_qman_init(void)
{
        struct device_node *dn;
        u32 is_portal_available;

        qman_init();

        is_portal_available = 0;
        for_each_compatible_node(dn, NULL, "fsl,qman-portal") {
                if (of_device_is_available(dn)) {
                        is_portal_available = 1;
                        break;
                }
        }

        if (!qman_have_ccsr() && is_portal_available) {
                struct qman_fq fq = {.fqid = 1};
                struct qm_mcr_queryfq_np np;
                int err, retry = CONFIG_FSL_QMAN_INIT_TIMEOUT;
                struct timespec nowts, diffts, startts = current_kernel_time();

                /* Loop while querying given fqid succeeds or time out */
                while (1) {
                        err = qman_query_fq_np(&fq, &np);
                        if (!err) {
                                /* success, control-plane has configured QMan */
                                break;
                        } else if (err != -ERANGE) {
                                pr_err("I/O error, continuing anyway\n");
                                break;
                        }
                        nowts = current_kernel_time();
                        diffts = timespec_sub(nowts, startts);
                        if (diffts.tv_sec > 0) {
                                if (!retry--) {
                                        pr_err("Time out, control-plane dead?\n");
                                        break;
                                }
                                pr_warn("Polling for the control-plane (%d)\n",
                                        retry);
                        }
                }
        }

        qman_resource_init();

        return 0;
}
subsys_initcall(early_qman_init);