sys/arch/powerpc/pic/ipi_openpic.c

   1 /* $NetBSD: ipi_openpic.c,v 1.3 2008/04/08 02:33:03 garbled Exp $ */
   2 /*-
   3  * Copyright (c) 2007 The NetBSD Foundation, Inc.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software contributed to The NetBSD Foundation
   7  * by Tim Rightnour
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __KERNEL_RCSID(0, "$NetBSD: ipi_openpic.c,v 1.3 2008/04/08 02:33:03 garbled Exp $");
  33
  34 #include "opt_multiprocessor.h"
  35 #include <sys/param.h>
  36 #include <sys/malloc.h>
  37 #include <sys/kernel.h>
  38
  39 #include <uvm/uvm_extern.h>
  40
  41 #include <machine/pio.h>
  42 #include <powerpc/openpic.h>
  43 #include <powerpc/atomic.h>
  44
  45 #include <arch/powerpc/pic/picvar.h>
  46 #include <arch/powerpc/pic/ipivar.h>
  47
  48 #ifdef MULTIPROCESSOR
  49
  50 extern struct ipi_ops ipiops;
  51 extern volatile u_long IPI[CPU_MAXNUM];
  52 static void openpic_send_ipi(int, u_long);
  53 static void openpic_establish_ipi(int, int, void *);
  54
  55 void
  56 setup_openpic_ipi(void)
  57 {
  58         uint32_t x;
  59
  60         ipiops.ppc_send_ipi = openpic_send_ipi;
  61         ipiops.ppc_establish_ipi = openpic_establish_ipi;
  62         ipiops.ppc_ipi_vector = IPI_VECTOR;
  63
  64         /* Some (broken) openpic's byteswap on read, but not write. */
  65         openpic_write(OPENPIC_IPI_VECTOR(0), OPENPIC_IMASK);
  66         x = openpic_read(OPENPIC_IPI_VECTOR(0));
  67         if (x != OPENPIC_IMASK)
  68                 x = bswap32(openpic_read(OPENPIC_IPI_VECTOR(1)));
  69         else
  70                 x = openpic_read(OPENPIC_IPI_VECTOR(1));
  71         x &= ~(OPENPIC_IMASK | OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK);
  72         x |= (15 << OPENPIC_PRIORITY_SHIFT) | ipiops.ppc_ipi_vector;
  73         openpic_write(OPENPIC_IPI_VECTOR(1), x);
  74 }
  75
  76 static void
  77 openpic_send_ipi(int target, u_long mesg)
  78 {
  79         int cpumask = 0, i;
  80
  81         switch(target) {
  82                 case IPI_T_ALL:
  83                         for (i = 0; i < ncpu; i++) {
  84                                 cpumask |= 1 << i;
  85                                 atomic_setbits_ulong(&IPI[i], mesg);
  86                         }
  87                         break;
  88                 case IPI_T_NOTME:
  89                         for (i = 0; i < ncpu; i++) {
  90                                 if (i != curcpu()->ci_index)
  91                                         cpumask |= 1 << i;
  92                                 atomic_setbits_ulong(&IPI[i], mesg);
  93                         }
  94                         break;
  95                 default:
  96                         cpumask = 1 << target;
  97                         atomic_setbits_ulong(&IPI[target], mesg);
  98         }
  99         openpic_write(OPENPIC_IPI(curcpu()->ci_index, 1), cpumask);
 100 }
 101
 102 static void
 103 openpic_establish_ipi(int type, int level, void *ih_args)
 104 {
 105 /*
 106  * XXX
 107  * for now we catch IPIs early in pic_handle_intr() so no need to do anything
 108  * here
 109  */
 110 #if 0
 111         intr_establish(ipiops.ppc_ipi_vector, type, level, ppcipi_intr,
 112             ih_args);
 113 #endif
 114 }
 115
 116 #endif /*MULTIPROCESSOR*/