FreeBSD/Linux Kernel Cross Reference
sys/arm/qualcomm/qcom_scm_legacy.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 <vm/pmap.h>
    
    #include <machine/cpu.h>
    #include <machine/bus.h>
    #include <machine/intr.h>
    #include <machine/machdep.h>
    #include <machine/smp.h>
    
    #include <arm/qualcomm/qcom_scm_defs.h>
    #include <arm/qualcomm/qcom_scm_legacy_defs.h>
    #include <arm/qualcomm/qcom_scm_legacy.h>
    
    #include <dev/psci/smccc.h>
    
    /*
     * Set the cold boot address for (later) a mask of CPUs.
     *
     * Don't set it for CPU0, that CPU is the boot CPU and is already alive.
     *
     * For now it sets it on CPU1..3.
     *
     * This works on the IPQ4019 as tested; the retval is 0x0.
     */
    uint32_t
    qcom_scm_legacy_mp_set_cold_boot_address(vm_offset_t mp_entry_func)
    {
            struct arm_smccc_res res;
            int ret;
            int context_id;
    
            uint32_t scm_arg0 = QCOM_SCM_LEGACY_ATOMIC_ID(QCOM_SCM_SVC_BOOT,
                QCOM_SCM_BOOT_SET_ADDR, 2);
    
            uint32_t scm_arg1 = QCOM_SCM_FLAG_COLDBOOT_CPU1
                | QCOM_SCM_FLAG_COLDBOOT_CPU2
                | QCOM_SCM_FLAG_COLDBOOT_CPU3;
            uint32_t scm_arg2 = pmap_kextract((vm_offset_t)mp_entry_func);
    
            ret = arm_smccc_smc(scm_arg0, (uint32_t) &context_id, scm_arg1,
                scm_arg2, 0, 0, 0, 0, &res);
    
            if (ret == 0 && res.a0 == 0)
                    return (0);
            printf("%s: called; error; ret=0x%08x; retval[0]=0x%08x\n",
                __func__, ret, res.a0);
    
            return (0);
    }

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