arch/mips/netlogic/xlr/wakeup.c

   1 /*
   2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3  * reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the NetLogic
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/threads.h>
  38
  39 #include <asm/asm.h>
  40 #include <asm/asm-offsets.h>
  41 #include <asm/mipsregs.h>
  42 #include <asm/addrspace.h>
  43 #include <asm/string.h>
  44
  45 #include <asm/netlogic/haldefs.h>
  46 #include <asm/netlogic/common.h>
  47 #include <asm/netlogic/mips-extns.h>
  48
  49 #include <asm/netlogic/xlr/iomap.h>
  50 #include <asm/netlogic/xlr/pic.h>
  51
  52 int __cpuinit xlr_wakeup_secondary_cpus(void)
  53 {
  54         struct nlm_soc_info *nodep;
  55         unsigned int i, j, boot_cpu;
  56         volatile u32 *cpu_ready = nlm_get_boot_data(BOOT_CPU_READY);
  57
  58         /*
  59          *  In case of RMI boot, hit with NMI to get the cores
  60          *  from bootloader to linux code.
  61          */
  62         nodep = nlm_get_node(0);
  63         boot_cpu = hard_smp_processor_id();
  64         nlm_set_nmi_handler(nlm_rmiboot_preboot);
  65         for (i = 0; i < NR_CPUS; i++) {
  66                 if (i == boot_cpu || !cpumask_test_cpu(i, &nlm_cpumask))
  67                         continue;
  68                 nlm_pic_send_ipi(nodep->picbase, i, 1, 1); /* send NMI */
  69         }
  70
  71         /* Fill up the coremask early */
  72         nodep->coremask = 1;
  73         for (i = 1; i < NLM_CORES_PER_NODE; i++) {
  74                 for (j = 1000000; j > 0; j--) {
  75                         if (cpu_ready[i * NLM_THREADS_PER_CORE])
  76                                 break;
  77                         udelay(10);
  78                 }
  79                 if (j != 0)
  80                         nodep->coremask |= (1u << i);
  81                 else
  82                         pr_err("Failed to wakeup core %d\n", i);
  83         }
  84
  85         return 0;
  86 }