FreeBSD/Linux Kernel Cross Reference
sys/arm/qualcomm/ipq4018_mp.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include "opt_platform.h"
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/reboot.h>
    #include <sys/devmap.h>
    #include <sys/smp.h>
    
    #include <vm/vm.h>
    
    #include <machine/cpu.h>
    #include <machine/bus.h>
    #include <machine/intr.h>
    #include <machine/machdep.h>
    #include <machine/platformvar.h>
    #include <machine/smp.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_cpu.h>
    
    #include <arm/qualcomm/ipq4018_machdep.h>
    #include <arm/qualcomm/qcom_scm_legacy.h>
    #include <arm/qualcomm/qcom_cpu_kpssv2.h>
    
    #include "platform_if.h"
    
    void
    ipq4018_mp_setmaxid(platform_t plat)
    {
            int ncpu;
    
            /* If we've already set the global vars don't bother to do it again. */
            if (mp_ncpus != 0)
                    return;
    
            /* Read current CP15 Cache Size ID Register */
            ncpu = cp15_l2ctlr_get();
            ncpu = CPUV7_L2CTLR_NPROC(ncpu);
    
            mp_ncpus = ncpu;
            mp_maxid = ncpu - 1;
    
            printf("SMP: ncpu=%d\n", ncpu);
    }
    
    static boolean_t
    ipq4018_start_ap(u_int id, phandle_t node, u_int addr_cells, pcell_t *arg)
    {
    
            /*
             * For the IPQ401x we assume the enable method is
             * "qcom,kpss-acc-v2".  If this path gets turned into
             * something more generic for other 32 bit qualcomm
             * SoCs then we'll likely want to turn this into a
             * switch based on "enable-method".
             */
            return qcom_cpu_kpssv2_regulator_start(id, node);
    }
    
    void
    ipq4018_mp_start_ap(platform_t plat)
    {
            int ret;
    
            /*
             * First step - SCM call to set the cold boot address to mpentry, so
             * CPUs hopefully start in the MP path.
            */
           ret = qcom_scm_legacy_mp_set_cold_boot_address((vm_offset_t) mpentry);
           if (ret != 0)
                   panic("%s: Couldn't set cold boot address via SCM "
                       "(error 0x%08x)", __func__, ret);
   
           /*
            * Next step - loop over the CPU nodes and do the per-CPU setup
            * required to power on the CPUs themselves.
            */
           ofw_cpu_early_foreach(ipq4018_start_ap, true);
   
           /*
            * The next set of IPIs to the CPUs will wake them up and enter
            * mpentry.
            */
   }

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