FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/bcm2836_mp.c

     /*-
      * Copyright (C) 2015 Daisuke Aoyama <aoyama@peach.ne.jp>
      * 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 AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     *
     * 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 <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/smp.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <machine/cpu.h>
    #include <machine/smp.h>
    #include <machine/bus.h>
    #include <machine/fdt.h>
    #include <machine/intr.h>
    #include <machine/platformvar.h>
    
    #include <arm/broadcom/bcm2835/bcm2836_mp.h>
    
    #ifdef DEBUG
    #define DPRINTF(fmt, ...) do {                  \
            printf("%s:%u: ", __func__, __LINE__);  \
            printf(fmt, ##__VA_ARGS__);             \
    } while (0)
    #else
    #define DPRINTF(fmt, ...)
    #endif
    
    #define ARM_LOCAL_BASE          0x40000000
    #define ARM_LOCAL_SIZE          0x00001000
    
    /* mailbox registers */
    #define MBOXINTRCTRL_CORE(n)    (0x00000050 + (0x04 * (n)))
    #define MBOX0SET_CORE(n)        (0x00000080 + (0x10 * (n)))
    #define MBOX1SET_CORE(n)        (0x00000084 + (0x10 * (n)))
    #define MBOX2SET_CORE(n)        (0x00000088 + (0x10 * (n)))
    #define MBOX3SET_CORE(n)        (0x0000008C + (0x10 * (n)))
    #define MBOX0CLR_CORE(n)        (0x000000C0 + (0x10 * (n)))
    #define MBOX1CLR_CORE(n)        (0x000000C4 + (0x10 * (n)))
    #define MBOX2CLR_CORE(n)        (0x000000C8 + (0x10 * (n)))
    #define MBOX3CLR_CORE(n)        (0x000000CC + (0x10 * (n)))
    
    static bus_space_handle_t bs_periph;
    
    #define BSRD4(addr) \
            bus_space_read_4(fdtbus_bs_tag, bs_periph, (addr))
    #define BSWR4(addr, val) \
            bus_space_write_4(fdtbus_bs_tag, bs_periph, (addr), (val))
    
    void
    bcm2836_mp_setmaxid(platform_t plat)
    {
    
            DPRINTF("platform_mp_setmaxid\n");
            if (mp_ncpus != 0)
                    return;
    
            mp_ncpus = 4;
            mp_maxid = mp_ncpus - 1;
            DPRINTF("mp_maxid=%d\n", mp_maxid);
    }
    
    void
    bcm2836_mp_start_ap(platform_t plat)
    {
            uint32_t val;
            int i, retry;
   
           DPRINTF("platform_mp_start_ap\n");
   
           /* initialize */
           if (bus_space_map(fdtbus_bs_tag, ARM_LOCAL_BASE, ARM_LOCAL_SIZE,
               0, &bs_periph) != 0)
                   panic("can't map local peripheral\n");
           for (i = 0; i < mp_ncpus; i++) {
                   /* clear mailbox 0/3 */
                   BSWR4(MBOX0CLR_CORE(i), 0xffffffff);
                   BSWR4(MBOX3CLR_CORE(i), 0xffffffff);
           }
           wmb();
           dcache_wbinv_poc_all();
   
           /* boot secondary CPUs */
           for (i = 1; i < mp_ncpus; i++) {
                   /* set entry point to mailbox 3 */
                   BSWR4(MBOX3SET_CORE(i),
                       (uint32_t)pmap_kextract((vm_offset_t)mpentry));
                   /* Firmware put cores in WFE state, need SEV to wake up. */
                   dsb();
                   sev();
   
                   /* wait for bootup */
                   retry = 1000;
                   do {
                           /* check entry point */
                           val = BSRD4(MBOX3CLR_CORE(i));
                           if (val == 0)
                                   break;
                           DELAY(100);
                           retry--;
                           if (retry <= 0) {
                                   printf("can't start for CPU%d\n", i);
                                   break;
                           }
                   } while (1);
   
                   /* dsb and sev */
                   dsb();
                   sev();
   
                   /* recode AP in CPU map */
                   CPU_SET(i, &all_cpus);
           }
   }

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