FreeBSD/Linux Kernel Cross Reference
sys/arm/xilinx/zy7_mp.c

     /*-
      * Copyright (c) 2013 Thomas Skibo.  All rights reserved.
      *
      * 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 ``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 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/smp.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <machine/cpu.h>
    #include <machine/smp.h>
    #include <machine/fdt.h>
    #include <machine/intr.h>
    
    #include <arm/xilinx/zy7_reg.h>
    
    #define ZYNQ7_CPU1_ENTRY        0xfffffff0
    
    #define SCU_CONTROL_REG         0xf8f00000
    #define    SCU_CONTROL_ENABLE   (1 << 0)
    
    void
    platform_mp_setmaxid(void)
    {
    
            mp_maxid = 1;
            mp_ncpus = 2;
    }
    
    void    
    platform_mp_start_ap(void)
    {
            bus_space_handle_t scu_handle;
            bus_space_handle_t ocm_handle;
            uint32_t scu_ctrl;
    
            /* Map in SCU control register. */
            if (bus_space_map(fdtbus_bs_tag, SCU_CONTROL_REG, 4,
                              0, &scu_handle) != 0)
                    panic("platform_mp_start_ap: Couldn't map SCU config reg\n");
    
            /* Set SCU enable bit. */
            scu_ctrl = bus_space_read_4(fdtbus_bs_tag, scu_handle, 0);
            scu_ctrl |= SCU_CONTROL_ENABLE;
            bus_space_write_4(fdtbus_bs_tag, scu_handle, 0, scu_ctrl);
    
            bus_space_unmap(fdtbus_bs_tag, scu_handle, 4);
    
            /* Map in magic location to give entry address to CPU1. */
            if (bus_space_map(fdtbus_bs_tag, ZYNQ7_CPU1_ENTRY, 4,
                0, &ocm_handle) != 0)
                    panic("platform_mp_start_ap: Couldn't map OCM\n");
    
            /* Write start address for CPU1. */
            bus_space_write_4(fdtbus_bs_tag, ocm_handle, 0,
                pmap_kextract((vm_offset_t)mpentry));
    
            bus_space_unmap(fdtbus_bs_tag, ocm_handle, 4);
    
            /*
             * The SCU is enabled above but I think the second CPU doesn't
             * turn on filtering until after the wake-up below. I think that's why
             * things don't work if I don't put these cache ops here.  Also, the
             * magic location, 0xfffffff0, isn't in the SCU's filtering range so it
             * needs a write-back too.
             */
            dcache_wbinv_poc_all();
    
            /* Wake up CPU1. */
            dsb();
            sev();
    }

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